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Sample records for 64-slice spiral ct

  1. 64-slice spiral CT in the diagnosis of Caroli disease

    International Nuclear Information System (INIS)

    Objective: To investigate the value of 64-slice spiral CT in the diagnosis of Caroli disease. Methods: 64-slice spiral CT of 15 patients with histologically proven Caroli disease was reviewed. Results: All cases were polycystic or multi-tubular hypodensities in the livers communicating with intrahepatic bile ducts. There was no contrast enhancement. The central dot sign was detected on 2 patients. Of 12 patients with type I disease, ancillary findings included multiple hemangiomas and small cysts in the liver (2), bile duct stones (4), pneumobilia (3), and cholangitis (1). Of the remaining 3 patients with type II disease, two had liver cirrhosis and the other cholangitis with periportal fibrosis. Conclusion: 64 slice spiral CT with multiplanar reconstruction allows clear depiction of cystic liver lesions and their relationship with intrahepatic bile ducts. It is valuable in the diagnosis of Caroli disease. (authors)

  2. Application of 64 slice spiral CT in evaluating the patency of coronary artery after stent implantation

    Institute of Scientific and Technical Information of China (English)

    Yong-Shu Gao; Xing-Can Ma

    2015-01-01

    Objective:To explore the feasibility and effectiveness of 64 slice spiral CT in evaluating the patency of coronary artery after stent implantation.Methods:The 64 slice spiral CT image data of 125 patients after coronary artery stent implantation were collected, meanwhile, the image data of 25 patients underwent coronary angiography were also collected. The feasibility and accuracy of 64 slice spiral CT coronary artery stent imaging were comparatively analyzed. Results: The 64 slice spiral CT imaging quality with a stent diameter greater than 3.00 mm was significantly superior to that with a diameter of 2.25-3.00 mm. The CT imaging quality in the left main coronary artery and anterior descending artery was significantly higher than that in the left circumflex coronary artery. The CT imaging quality in the left main coronary artery was significantly higher than that in the right coronary artery. The CT reconstruction imaging quality in the drug coating stent was significantly superior to that in the bare metal stent. The sensitivity of 64 slice spiral CT was 100.00%, and the accuracy was 100.00%. In detecting the coronary artery with occlusion and stenosis (stent stenosis greater than 50%), the sensitivity was 90.00%, the false negative rate was 10.00%, and the positive predicative value was 100.00%.Conclusions:The effect of 64 slice spiral CT coronary imaging in evaluating the patency of coronary artery after stent implantation is highly consistent with that by coronary angiography, with a simple operation, less risk, and low cost, and thus, it can be completely taken as the imaging method in evaluating the patency of coronary artery after stent implantation.

  3. Optimizing 64-slice spiral CT angiography in lower extremity arterial disease with individualized injection protocol

    International Nuclear Information System (INIS)

    Objective: To explore the optimal protocol of the 64-slice spiral CT angiography (CTA) in lower extremity arterial disease. Methods: Forty -eight patients with clinically suspected lower extremity arterial disease underwent GE LightSpeed VCT using individual and traditional injection protocols. The clinical value of CTA was evaluated using DSA as the standard reference. Results: Satisfactory images were obtained from 47 of 48 cases. Images fulfilling clinical diagnostic requirements after appropriate post -procession on workstation were obtained from 1 case. The image quality of the group with the individualized injection protocol was significantly superior to that of the group with the traditional image protocol. The sensitivity and specificity of CTA in detecting middle-grade and severe arterial stenosis were 86.1% and 86.6%, respectively. Conclusion: 64-slice spiral CT angiography is a reliable method for evaluating the lower extremity arterial disease, and is a more ideal method if using individualized injection protocol. (authors)

  4. Clinical value of 64-slice spiral CT for classification of femoral neck fracture

    International Nuclear Information System (INIS)

    Objective: To evaluate the clinical application of 64-slice spiral CT for classification of femoral neck fracture. Methods: The survey was comprised of 46 patients with femoral neck fractures detected with plain radiographs and CT images. Cases were randomly presented in 2 formats: plain radiographs and CT. Garden classification was queried. Modification of garden classification (nondisplaced vs displaced) was taken to compare with plain radiographs and CT in the study. Results: The results of classification for plain radiographs were 2 cases of Garden Ⅰ, 10 cases of Ⅱ, 22 cases of Ⅲ, and 12 cases of Ⅳ. Those for CT were 1 cases of Garden Ⅰ, 4 cases of Ⅱ, 26 cases of Ⅲ, and 15 cases of Ⅳ. CT improved the accuracy of Garden Classification (P<0.05). Conclusion: Garden classification using CT images shows good conformation with results of surgery. 64-Slic CT is better plain radiographs for Garden classification of femoral neck fracture. (authors)

  5. Clinical application of 64-slice spiral CT in the diagnosis of the Tetralogy of Fallot

    International Nuclear Information System (INIS)

    Objective: To explore the clinical application of 64-slice spiral CT in the diagnosis of the Tetralogy of Fallot. Methods: Eighteen patients with diagnosed Tetralogy of Fallot underwent cardiac CT angiography with 64-slice CT (CTA). Two- and three-dimensional images were used for diagnosing in all cases by means of MPR (coronal, sagital and oblique), cMPR, MIP and VRT. Results: All patients had ventricular septal defect, pulmonary stenosis and hypertrophy of right ventricle. The morphologic features of Tetralogy of Fallot were equal to echocardiography. Patent ductus arteriosus (PDA) were detected on eight patients. Main coronary artery branches and partial sub-branches were visualized in all patients. Abnormal coronary arteries were found in seven cases: both left and right main coronary artery arising from the right aortic sinus one case, right main coronary artery and circumflex (CX) arising from the right aortic sinus one case, left anterior descending (LAD) and CX arising from left aortic sinus directly one case, left and right coronary artery arising from back and front of the aortic sinus, respectively, three cases. Pulmonary artery branch stenosis was found in 12 cases and branch pulmonary artery dilation noticed in 1 case. Double superior vena cava was also found in one case. According to the surgery the diagnostic accuracy of CT and Echocardiography was 95.45 and 83.33%, respectively. Conclusion: Two- and three-dimensional 64-slice CTA not only show the overall anatomical structure of the heart, but also show coronary and pulmonary arteries. With these results, evaluation of coronary anomalies and pulmonary artery stenosis with 64-MSCT is extremely valuable for planning the operative procedure on the patients with Tetralogy of Fallot

  6. Coronary artery imaging with 64-slice spiral CT in atrial fibrillation patients: initial experience

    International Nuclear Information System (INIS)

    Objective: To discuss the clinical value of coronary artery imaging using 64-slice spiral CT in patient with atrial fibrillation. Methods: The images of 31 patients with atrial fibrillation who underwent contrast-enhanced CT coronary angiography were evaluated. The presence of stenosis on each segment of coronary arteries was recorded and their degree of stenosis was measured using the vessel analysis software. Ten patients additionally underwent conventional coronary angiography. The results of conventional coronary angiography were compared with CT coronary angiography of the 10 patients. Results: Image reconstruction was based on absolute timing. The image quality of 364 coronary vessel segments on the images from 31 patients was evaluated and defined as excellent, fine, moderate or poor. The image quality was excellent, fine, moderate and poor in 85, 41, 5, and 8 vessel segments respectively in patient group with heart rate between 47 beat per minent (bpm) and 69 bpm; and in 63, 16, 13, and 15 vessel segments respectively in patent group with heart rate between 70 bpm and 79 bpm;and in 46, 25, 23, and 24 vessel segments in patient group with heart rate between 80 bpm and 105 bpm. There was significant difference among the three patient groups (H=22.08, P<0.01). Comparison was carried out between CT angiographic findings and conventional angiographic findings of the 125 segments of the coronary arteries in the 10 patients who underwent conventional coronary angiography. The sensitivity and specificity of CT angiography for diagnosing vessel with significant coronary stenosis (≥50% narrowing) was 85.0% (17/20) and 95.2% (100/105), respectively. Positive predictive value was 77.3% (17/22), and negative predictive value was 97.1% (100/103). Coronary CTA underestimated the lesions of 3 vessel segments and overestimated the lesions of 5 vessel segments. Conclusion: Coronary artery imaging with 64-slice row CT had clinical value for patients with atrial fibrillation

  7. The clinical application of 64-slice spiral CT angiography in carotid artery bifurcation disease

    International Nuclear Information System (INIS)

    Objective: To explore the clinical value of 64-slice spiral CT angiography (CTA) in carotid stenosis and atherosclerotic plaque. Methods: 40 patients (80 carotid arteries) underwent CTA and DSA. These two examinations within one week. The results of CTA were compared with that of DSA, the sensitivity and specificity of CTA and DSA were figured out. Results: CTA performed well in the detection of mild (0% to 29%) carotid stenosis, as well as carotid occlusion, with values for sensitivity and specificity both near 100%. In determining that a stenosis was >50% by DSA measurement, CTA with a sensitivity, specificity of 89% and 91% respectively. While CTA was quite specific in identifying degrees of stenoses in either the 50% to 69% or the 70% to 99% ranges, in this task it was much less sensitive: 65% and 73% respectively. CTA can detect all kinds of ulcers while DSA can not. Conclusions: 64-slice CTA and DSA were correctly identified in detecting carotid stenosis. CTA could demonstrate ulcers associated with the carotid stenosis, hut DSA only show stenosis. (authors)

  8. The comparative study of 64-slices spiral CT angiography with DSA in lower extremity arterial occlusive diseases

    International Nuclear Information System (INIS)

    Objective: To study the clinical value of 64-slices spiral CTA with DSA comparatively in diagnosis of lower extremity arterial occlusive diseases. Methods: 31 patients with lower extremity arterial occlusive diseases underwent 64-slice spiral CT angiography of lower extremity arteries and they also underwent digital subtraction angiography (DSA)two weeks later. Reconstruction by maximum intensity projection (MIP), volume render (VR)and multiplanar reformatting (MPR)in working-station was undertaken comparing with the bolus chase DSA and traditional DSA for diagnostic accuracy. Results: The 216 arterial segments of lower extremity were selected, including 157 segments with consistent results in demonstrating degree of stenosis by both examinations. On CT angiography, 5 segmental stenosis were overestimated and 9 were underestimated. When stenosis of detected segments is more than 50%, the sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of CTA were 98.21%, 96.15%, 97.22%, 96.49%, and 98.04%, respectively. Conclusion: 64-slices spiral CT angiography is an effective and reliable method for evaluating the lower extremity arterial occlusive diseases and may provide precious information for planning interventional therapy. (authors)

  9. Preliminary study of X-ray dosage reduction using post-processing filter in 64-slice spiral CT cardiac examination

    International Nuclear Information System (INIS)

    Objective: To evaluate the adaptive post-processing filter (C2) on reducing X-ray dosage in 64-slice CT cardiac examinations. Methods: The study was divided into two steps: (1) On 30 consecutive patients (group A) prescribed for cardiac scans on 64-slice CT, the scan protocol was 120 kV, 640 mA, 0.35 s/r, 0.625 mm slice thickness, 0.22-0.24 pitch and large body bowtie. For each patients, cardiac images were reconstructed with and without C2 filter to create two image sets (C2 and NC2, respectively). The image quality was blindly evaluated between C2 and NC2. Image noises were also measured and their means and standard deviations calculated for the two sets. Statistical t-test analysis was performed on the quality scores and the noise between the two data sets. (2) On the 30 consecutive cardiac patients in another group (group B), the protocol was kept the same as in group A except for decreasing the tube current 450 mA based on the results from group A. Images were reconstructed using post-processing filter C2 to create 2C2 image set. Statistical t-test was performed between image sets of 2C2 and NC2 in step 1. (3) CTDIvol values from the 2C2 and NC2 (C2) groups were converted into effective dose (ED) and the ED values of the two groups were compared. Results: (1) The image quality scores for the C2 and NC2 sets were 3.71±0.31 and 3.72±0.29, respectively, with t-test of P>0.05, indicating no significant statistical difference (P>0.05). The noise of C2 and NC2 sets were 22±4, 27±5, respectively, indicating the difference was statistically significant (P2 filter had 18% noise reduction compared to those without C2 filter. (2) The image quality scores for the 2C2 and NC2 sets were 3.67± 0.34, 3.72±0.29, indicating no significant statistical difference (P>0.05). The noise of 2C2 and NC2 sets were 26±3, 27±5, indicating no significant statistical difference (P>0.05). (3) The average CTDIvol values were 60±5 mGy, 88±10 mGy for 2C2 and NC2 (C2) groups

  10. Preliminary Reports on the Accuracy of Coronary CT-Angiography Using 64-slice Multi-slice Spiral CT (MSCT in Iran

    Directory of Open Access Journals (Sweden)

    "A. Arjmand Shabestari

    2005-08-01

    Full Text Available Introduction & Background: Coronary artery disease (CAD is the leading cause of death in many western countries. Its prevalence and incidence among Irani-ans particularly in the urban areas are increasing. Ac-cording to the newest Tehran annual mortality re-port, the most common cause of death in Tehran is cardiovascular disease. Diagnostic gold standard in CAD is fluoroscopic coronary angiography (FCA us-ing catheterization. Nevertheless, it is an invasive method and in recent years, some non-invasive or less-invasive imaging modalities such as MRI and CT scans have been used to investigate CAD. One of the most attractive new methods in this regard is Coro-nary CT-Angiography (CCTA, which has gained considerable attention. Multi-slice spiral CT (MSCT scanners with simultaneous acquisition of multiple (up to 64 slices in less than half a second of gantry rotation time (in our study, 0.33 second, have be-come available, resulting in minimally-invasive coro-nary artery imaging. The purpose of this study is to determine the diagnostic accuracy of a new 64-slice MSCT scanner in the diagnosis of coronary artery and/or bypass grafts occlusion or hemodynamically significant stenosis. Parients & Methods: This investigation is underway in patients undergoing elective FCA. A 64-channel per rotation MSCT scanner (Somatom Sensation 64, Siemens Medical Systems, Forchheim, Germany, with 0.6 mm collimation, 0.33 second gantry rotation time and 120 KVp was used to perform CCTA. Ap-proximately 70-90 mL of a nonionic contrast medium was injected intravenously. All coronary artery seg-ments, according to American Heart Association (AHA classification & nomenclature system were analyzed. Patients who had undergone previous coronary artery bypass grafts (CABGs, or used coro-nary stents were enrolled in the study, as well. MSCT scans were carried out within 10 days of catheteriza-tion, and the most dramatically stenotic lesions were analyzed in CCTA by a semi

  11. The optimization of low-dose scanning protocols of 64-slice spiral CT in the adult chest: a multicenter study

    International Nuclear Information System (INIS)

    Objective: To compare the image quality of chest low dose CT (LDCT) using automatic exposure control (AEC) and constant current. control (CCC) and explore a more reasonable scanning protocol. Methods: Two hundred and eighty participants were examined with 64 CT scanner at 7 centers in China. All were divided into 4 groups. Two groups underwent LDCT using AEC with standard deviation set at 25 (Al) and 30 (A2) respectively and the tube current ranged from 10 mA to 80 mA. The other two groups underwent LDCT using CCC with tube current set at 40 mA (Cl) and 50 mA (C2) respectively. The axial and MPR images were evaluated by two radiologists who were blinded to the scanning protocols. The radiation dose, noise and the image quality of the 4 groups were compared and analyzed statistically. Differences of radiation dose and noise among groups were determined with variance analysis and t test, image quality with Mann- Whitney test and the consistency of diagnosis with Kappa test. Results: There was a significant lower DLP in AEC group than in CCC group [(82.62±40.31) vs (110.81±18.21) mGy · cm (F=56.88, P 0.05]. The noisy of AEC group was higher than that of CCC group both on lung window (41.50±9.58 vs 40.86±7.03) and mediastinum window (41.19±7.83 vs 40.92±9.89), but there was no significant difference (Flung=0.835, P=0.476, Fwediastinum=1.910, P=0.128). The quality score of axial image in AEC group was higher than that in CCC group (superior margin of the brachiocephalic vein level: 4.49± 0.56 vs 4.38±0.64, superior margin of the aortic arch: 4.86±0.23 vs 4.81±0.32, the right superior lobar bronchus Level: 4.87±0.27 vs 4.84±0.22, the right middle lobar bronchus Level: 4.90±0.25 vs 4.88±0.21) except on the right inferior pulmonary vein level (4.92±0.25 vs 4.93±0.17) and superior margin of the left diaphragmatic dome level (4.91±0.27 vs 4.93±0.22) on lung window, but no significant differences (F=0.076-1.748, P>0.05) were observed. A significant higher

  12. 64层螺旋CT冠状动脉成像影响因素分析%Analysis of Influential Factors of 64-slice Spiral CT Coronary Angiography

    Institute of Scientific and Technical Information of China (English)

    刘伟宾

    2011-01-01

    目的 探讨64层螺旋CT冠状动脉成像的质量影响因素.方法 回顾性分析514例行64层螺旋CT冠状动脉成像的影像资料.结果 根据图像评价方法,本组优321例,占62.5%;良138例,26.8%;差55例,占10.7%,认定为检查失败.127例ECG前瞻式门控扫描检查失败21例,占16.5%;387例回顾式门控扫描检查失败34例,占8.8%.检查时心率波动≤5/min 313例,7例失败,占2.2%;6~10/min 175例,23例检查失败,占13.1%;10~20/min 26例,25例检查失败,占96.2%.检查过程中37例屏气不好,32例检查失败,占86.5%;3例扫描过程中未能控制呛咳、呃逆,检查失败;53例冠状动脉搭桥术后复查者,1例因扫描范围不足而检查失败;3例过于肥胖,1例扫描参数过低而导致检查失败.结论 充分认识64层螺旋CT冠状动脉成像检查中影响成像质量的因素,争取患者最佳配合状态,方能获得更好的图像质量,提高诊断准确性.%Objective To discuss the influential factors of image quality of 64-slice spiral CT coronary angiography (CTCA). Methods The imaging data of 514 patients with coronary artery disease were retrospectively analyzed. Results According to image evaluation method, the results were excellent in 321 patients(62.5% ), good in 138 ( 26. 8% ) , and poor and regarded as failures in 55( 10.7% ). 127 patients underwent prospective electrocardiographic (ECG) gating, but failed in 21 patients (16.5%) ; 387 patients underwent retrospective ECG gating, and failed in 34 patients (8.8%). 313 patients had heart rate fluctuation ≤5 beats per minute( BPM), among whom, 7 (2.2%) failed in examination; 175 patients had heart rate from 6 BPM to 10 BPM, among whom, 23 (13.1%) failed in examination; 26 patients had heart rate from 10 BPM to 20 BPM,among whom, 25 failed in examination; 37 patients had poor breathholding, among whom, 32(86.5% )failed in examination.3 failed in examination due to incontrollable bucking and hiccup during the

  13. Value of 64-slice spiral CT in detection of the extrahepatic artery of primary hepatocellular carcinoma%64层螺旋 CT对原发性肝癌肝外供血动脉的诊断价值

    Institute of Scientific and Technical Information of China (English)

    王树庆; 左赞江; 宋高业; 姚斌; 杨德军; 谢柳平

    2015-01-01

    目的:探讨64层螺旋CT对原发性肝癌肝外供血动脉的诊断价值。方法回顾性分析经 DSA 证实的存在肝外供血动脉的41例肝癌患者的64层 CT 资料。分别统计 CT 和 DSA 能检出的肝癌肝外供血动脉数,将两者的结果进行 Kappa 一致性检验并分析。另总结有侧支性供血动脉的肝癌的 CT 表现特点。结果本资料75%(48/64)的肝癌肝外供血动脉能够通过 CT 正确检出。CT 与 DSA 相比,在对肝癌肝外供血动脉的检出上一致性好(k =0.62,P <0.05)。一些常规 CT 表现特点可对肝癌存在侧支性供血动脉作出提示性诊断。CT 指导后的 DSA 提高了对肝外供血动脉的检出率。结论64层 CT 对肝癌肝外供血动脉有良好的检出能力,认真分析术前 CT 特征对肝癌的肝动脉化疗栓塞术(TACE)治疗有重要的临床意义。%Objective To investigate the value of 64-slice spiral CT in detection of extrahepatic artery of primary hepatocellular carcinoma (PHC).Methods 64-slice spiral CT data of 41 patients with PHC with extrahepatic arteries were retrospectively ana-lyzed.The number of these extrahepatic arteries was measured on CT and DSA respectively.Cohen’s Kappa test was used to deter-mine the consistency between CT and DSA.The imaging features of PHC supplied by the lateral blood vessels were also summa-rized.Results Among 64 branches of the extrahepatic arteries,48 (75%)were detected by CT.64-slice spiral CT showed a good consistency on the diagnosis of PHC extrahepatic artery with DSA.Some CT characteristics of PHC were helpful for identification of the lateral blood vessels.The DSA under CT guidance improved the detection rate of extrahepatic artery.Conclusion 64-slice spiral CT has better ability in detection of PHC extrahepatic artery and improves the detection rate.Preoperative CT palys an important role in transcatheter arterial chemoembolization treatment of PHC.

  14. Coronary artery visibility in free-breathing young children with congenital heart disease on cardiac 64-slice CT: dual-source ECG-triggered sequential scan vs. single-source non-ECG-synchronized spiral scan

    International Nuclear Information System (INIS)

    The potential impact of dual-source ECG-triggered sequential CT scan on coronary artery visibility has not been evaluated in free-breathing young children. To compare coronary artery visibility in free-breathing young children with congenital heart disease on cardiac 64-slice CT between dual-source ECG-triggered sequential (DSET) scan and single-source non-ECG-synchronized spiral (SSNE) scan. In 93 young children, 108 cardiac 64-slice CT examinations were performed during free-breathing. Visibility of coronary arteries and side branches was compared between SSNE and DSET scans. Heart rates and trigger delays for DSET scan were recorded. Effective dose of each scan technique was calculated. Visual grades were significantly higher (P < 0.001 or =0.011) on DSET scan than on SSNE scan except for the distal left anterior descending artery. Coronary arteries were traceable in 79.3% on DSET scan and 54.3% on SSNE scan in the overlapped scan range (P < 0.0001), and 97.1% and 71.9% for the origins and proximal segments (P < 0.0001). Visibility of side branches was improved on DSET scan by a factor of 2.0. Heart rates and trigger delays for DSET scan were 131 ± 24 beats per min and 199 ± 44 ms, respectively. Effective doses of DSET and SSNE scans were 0.36 ± 0.12 mSv and 0.99 ± 0.23 mSv, respectively. DSET scan improves visibility of coronary arteries on cardiac 64-slice CT in free-breathing young children with congenital heart disease, compared with SSNE scan. (orig.)

  15. Coronary artery visibility in free-breathing young children with congenital heart disease on cardiac 64-slice CT: dual-source ECG-triggered sequential scan vs. single-source non-ECG-synchronized spiral scan

    Energy Technology Data Exchange (ETDEWEB)

    Goo, Hyun Woo; Yang, Dong Hyun [University of Ulsan College of Medicine, Department of Radiology and Research Institute of Radiology, Asan Medical Center, Seoul (Korea, Republic of)

    2010-10-15

    The potential impact of dual-source ECG-triggered sequential CT scan on coronary artery visibility has not been evaluated in free-breathing young children. To compare coronary artery visibility in free-breathing young children with congenital heart disease on cardiac 64-slice CT between dual-source ECG-triggered sequential (DSET) scan and single-source non-ECG-synchronized spiral (SSNE) scan. In 93 young children, 108 cardiac 64-slice CT examinations were performed during free-breathing. Visibility of coronary arteries and side branches was compared between SSNE and DSET scans. Heart rates and trigger delays for DSET scan were recorded. Effective dose of each scan technique was calculated. Visual grades were significantly higher (P < 0.001 or =0.011) on DSET scan than on SSNE scan except for the distal left anterior descending artery. Coronary arteries were traceable in 79.3% on DSET scan and 54.3% on SSNE scan in the overlapped scan range (P < 0.0001), and 97.1% and 71.9% for the origins and proximal segments (P < 0.0001). Visibility of side branches was improved on DSET scan by a factor of 2.0. Heart rates and trigger delays for DSET scan were 131 {+-} 24 beats per min and 199 {+-} 44 ms, respectively. Effective doses of DSET and SSNE scans were 0.36 {+-} 0.12 mSv and 0.99 {+-} 0.23 mSv, respectively. DSET scan improves visibility of coronary arteries on cardiac 64-slice CT in free-breathing young children with congenital heart disease, compared with SSNE scan. (orig.)

  16. Diagnostic Significance of Lumbar Spine Bone Metastases by 64 Slice Spiral CT and Whole Body Bone Imaging%64层螺旋CT与全身骨显像对腰椎骨转移瘤的诊断意义

    Institute of Scientific and Technical Information of China (English)

    宋世祥

    2014-01-01

    目的:探讨64层螺旋CT与99Tcm-MDP全身骨显像对腰椎骨转移瘤的诊断意义。方法回顾性分析临床确诊腰椎骨转移瘤且资料完整的住院诊治27例患者49处腰椎骨转移瘤,总结分析27例患者的64层螺旋CT与99Tcm-MDP全身骨显像检查结果。比较两种检查结果的灵敏度及特异性。结果经64层螺旋CT检查示,27例患者有41处腰椎锥体破坏;经99Tcm-MDP全身骨显像检查示,23例患者有31处腰椎椎体放射性异常浓集,27例患者发现椎体外多发放射性异常浓集。64层螺旋CT检查的灵敏度为83.6%,特异性为98.6%;99Tcm-MDP全身骨显像检查的灵敏度为63.2%,特异性为96.7%。经64层螺旋CT检查示,有17例明确诊断为腰椎转移瘤,10例可疑为腰椎转移瘤;经99Tcm-MDP全身骨显像检查示,有20例明确诊断为腰椎转移瘤,7例可疑为腰椎转移瘤。结论64层螺旋CT对腰椎骨转移瘤的诊断较99Tcm-MDP全身骨显像具有更高的灵敏度,但多数患者经99Tcm-MDP全身骨显像可获得较为明确的诊断。%Objective To investigate the diagnostic significance of lumbar spine bone metastases by 64 slice spiral CT and 99Tcm-MDP whole body bone imaging. Methods 27 cases of lumbar spine bone metastases with 49 places by clinical diagnosis and with complete hospitalization data were retrospectively analyzed, and the examination results of 27 cases with 64 slice spiral CT and 99Tcm-MDP whole body bone imaging were summarized and analyzed. The sensitivity and specificity of two kinds of examination results were compared. Results The examination result of 64 slice spiral CT showed that 41 vertebrae were damaged in 27 patients, the sensitivity was 83.6%, 17 cases of lumbar spine bone metastases were confirmed by 64 slice spiral CT, 10 patients were suspected. The examination result of 99Tcm-MDP whole body bone imaging showed that 31 vertebrae had radioactive anomaly concentration in 27 patients, the

  17. 急性阑尾炎超声与64排螺旋 CT 检查对比分析%The comparative analysis between ultrasound and 64-slice spiral CT examination in acute appendicitis

    Institute of Scientific and Technical Information of China (English)

    王振芳; 岳学旺; 毕言刚; 李飞; 张仕状

    2014-01-01

    目的:探讨超声与64排螺旋 CT 平扫检查在诊断急性阑尾炎中的应用价值。方法收集经手术、病理证实或经保守治疗好转确诊急性阑尾炎的患者65例,术前或治疗前均做了 B 超和 CT 检查,对急性阑尾炎病理改变的显示情况及诊断符合率进行对比分析。结果65例阑尾炎病变,在 CT 图像上正确诊断58例,诊断符合率为89.23%,超声图像正确诊断48例,诊断符合率为73.85%,2种检查方法诊断符合率具有统计学差异(χ2=5.11,P =0.024)。结论多排螺旋 CT 与超声相比在诊断急性阑尾炎方面有较高的诊断符合率。%Objective To investigate the application of ultrasound and 64-slice spiral CT in the diagnosis of acute appendicitis. Methods Sixty-five patients with pathologically or clinally confirmed acute appendicitis were underwent ultrasound and CT examina-tion before operation or conservative treatment.Compared with pathology,the accuracy of CT and B-ultrasound imaging were ana-lyzed.Results Fifty-eight cases were correctly diagnosed by CT and 48 cases were correctly diagnosed by ultrasound,the accuracy was 89.23% (58/65)and 73.85% (48/65),respectively.There was a statistically significant difference between two groups (χ2 =5.1 1,P =0.024).Conclusion The accuracy of multi-slice spiral CT is higher than ultrasound in the diagnosis of acute appendicitis.

  18. 不同临床分期肾细胞癌的多层螺旋 CT 灌注研究%Study on value of 64 slice spiral CT perfusion in different clinical stages of renal cell carcinoma

    Institute of Scientific and Technical Information of China (English)

    张颖颖; 董莹; 王义云

    2015-01-01

    Objective To evaluate the clinical value 64 slice spiral CT perfusion imaging in diagnosis for differ‐ent stages of renal cell carcinoma .Methods The clinical data of 41 patients with renal cell carcinoma from January 2011 to October 2013 were analyzed retrospectively .Using the pathological examination results as gold standard , blood flow perfusion after treatment ,blood volume(BV) ,peak enhancement (PEI) ,time to peak (TTP) ,mean transit time (MTT) and permeability surface (PS) were compared in differen stages ,evaluation index of CT in diagnosis for renal cell carcinoma staging were calculated .Results There were significant difference on perfusion ,BV ,PEI ,MTT , PS parameters between early and advanced renal cell carcinoma (P0 .05) .The sensitivity ,specificity ,misdiagnosis rate ,missed diagnosis rate and Youden index of renal CT perfusion imaging were 86 .36% ,89 .47% ,10 .53% ,13 .64% ,1 .758 and 0 .758 respetively .Conclusion There is high accuracy of 64 slice spiral CT perfusion imaging in diagnosis for different stages of renal cell carcinoma , which is worthy of application and promotion .%目的:探讨利用64排螺旋C T灌注成像技术对不同分期肾细胞癌进行诊断的临床价值及方法。方法回顾性分析莱芜市人民医院2011年1月至2013年10月收治的41例肾细胞癌患者的临床资料,以病理学检查结果作为临床分期的金标准,比较不同分期肾细胞癌的CT灌注成像经灌注软件包处理后的血流量(Perfusion),血容量(BV),峰值强化(PEI),达峰时间(TTP),平均通过时间(MTT),表面通透性(PS)指标的差异,同时计算CT诊断肾细胞癌分期的诊断学评价指标。结果早期肾细胞癌和晚期肾细胞癌的Perfusion、BV、PEI、M T T、PS参数比较,差异有统计学意义(P<0.05),而TTP参数比较差异无统计学意义(P>0.05)。采用CT 灌注成像技术诊断肾细胞癌分期的灵敏度为86.36

  19. Low dose scanning of 64 slice spiral CT in the diagnosis of pneumothorax in neonates%64层螺旋CT低剂量扫描在新生儿气胸诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    武军; 李彦杰

    2015-01-01

    目的:探讨64层螺旋CT低剂量扫描在新生儿气胸诊断中的应用,分析新生儿气胸的CT表现特点,以提高对新生儿气胸的认识及CT的诊断水平。方法用64层螺旋CT对23例临床可疑新生儿气胸进行低电压、低电流和增大螺距进行扫描,并对图像进行分析。结果患儿有不同类型的CT表现,如外侧肺气胸、内侧纵隔旁气胸、膈面附近及胸前部气胸等。结论新生儿肺气胸有一定的临床CT特征,对及时发现新生儿气胸,对临床诊断并及时处理有重要意义。%Objective Application of low dose of 64 row spiral CT scanning in the diagnosis of pneumothorax in neonatal pneumothorax, analysis CT charac-teristics, in order to improve the diagnostic level of understanding and CT on neonatal pneumothorax. Methods Twenty-three patients with clinically suspected of pneumothorax in neonates of low voltage, low current and increasing pitch were scanned by 64 slice spiral CT. And the image analysis. Results Patients with CT showed different types, such as lateral lung chest,medial mediastinum side pneumothorax, diaphrag-matic surface and near the front of pneumothorax. Conclusion Neonatal lung chest clinic and CT features, the timely detection of pneumothorax in neonates, for clinical diagnosis and timely treatment is meaningful.

  20. 门静脉系统血栓的64层螺旋CT诊断价值%The Diagnostic Value of Thrombus in Portal Vein on 64-slice Spiral CT

    Institute of Scientific and Technical Information of China (English)

    韩新巍; 周朋利; 郑颖; 丁鹏绪; 路慧彬; 司江涛

    2009-01-01

    Objective To study the 64-slice spiral CT feature of the thrombus in portal vein. Materials and Methoils Noocontrast-enhanced CT and contrast enhanced CT were performed in all 15 patients. MIP,VR and MPR were used for three dimensional reconstruction. The features of the throw.bus in portal vein were analyzed. Results In 15 cases, 13 cases(83%) occurred in trunk vein,6 cases in right branch,7 cases in left branch,3 cases in splenic vein,9 cases in superior mesenterie vein. Yerdel Grade:Grade Ⅰ1 case,Grade Ⅱ10 cases, Grade Ⅲ 3 cases,GradelV 1 case. 10 cases showed high-dense in thrombus ,3 cases appeared low-dense. 12 cases presented partial filling defect, which is described as stripe and bundles in contrasted vein. All the involved vein had smooth and successive wall and had no appeared nodes protrude out at portal vein period. All the cases with thrombus showed typical track sign or line augmentation sign in involved vein wall. 12 cases displayed collateral circulation in esophag-ogastricand splenic vein, and 4 cases displayed pericholecystic and pericholedochal collateral branches. No case visualized A-P shunt. Conclusion 64-slice spiral CT can display the location, feature and cumulative branch of the thrombus in portal vein distinctly and stereoscopically. 64-slice spiral CT is very important modality for the thrombus in portal vein.%目的 探讨门静脉系统血栓(portal vein thrombosis,PVT)的64层螺旋CT表现特征.资料与方法 15例PVT行64层螺旋CT平扫和双期增强扫描,采用最大密度投影(MIP)、容积再现(VR)及多平面重组(MPR)观察其影像学特征.结果 15例中,血栓发生于门静脉(PV)主干13例,右支6例,左支7例,脾静脉(SV)3例,肠系膜上静脉(SMV)9例,其中血栓同时累及PV主干和SMV 8例,同时累及PV左右支、主干和SMV 4例,累及PV主干和右支6例,累及PV主干和左支6例,累及SV和SMV 2例,PV主干、SV、SMV三岔口处血栓1例.Yerdel分级:Ⅰ级1例,Ⅱ级10例,Ⅲ级3

  1. 大前庭导水管综合征的64层螺旋CT诊断探讨%Discussion on 64-Slice Spiral CT Diagnosis of Large Vestibular Aqueduct Syndrome

    Institute of Scientific and Technical Information of China (English)

    车宏伟; 许茂盛; 刘俊

    2013-01-01

    目的:探讨64层螺旋CT在诊断大前庭导水管综合征的应用,以提高诊断正确率.方法:44例大前庭导水管综合征患者均行颞骨轴位薄层扫描,必要时行冠状位及斜矢状位重建.并对患者64层螺旋CT影像学表现进行分析.结果:在CT图像上44例患者,86耳(左42耳、右44耳),均不同程度显示前庭或总脚层面岩骨后缘骨质缺损影,部分骨质缺损影与前庭或总脚直接相通,前庭导水管外口和中间段宽度超过1.5 mm.结论:CT颞骨轴位薄层高分辨扫描对大前庭导水管综合征患者明确诊断具有重要临床价值,是其首选、常规的检查方法.%Objective:To discuss application of 64 slice spiral CT diagnosis of large vestibular aqueduct syndrome in order to improve diagnostic accuracy. Methods:44 patients with large vestibular aqueduct syndrome were all carried out temporal bone axial thin slice scan, coronal and oblique sagittal reconstruction if needed. And 64 slice spiral CT imaging findings of patients with large vestibular aqueduct syndrome were analyzed. Results:In CT images of 44 patients,86 ears (left ear of 42,right ear of 44) have varying degrees of showed vestibular or total foot dimensions of petrous bone posterior marginal osseous defect, bone defect and vestibular or total foot connected directly,the external aperture of vestibular aqueduct and the intermediate segment width greater than 1.5mm. Conclusion:There is an important clinical value of CT axial thin layer high resolution of temporal bone scanning to clarify a diagnosis of large vestibular aqueduct syndrome, which is the preferred, regular inspection method.

  2. Cirrhosis:CT grading with 64-slice spiral CT perfusion imaging%肝硬化CT分级的64层螺旋CT灌注成像分析

    Institute of Scientific and Technical Information of China (English)

    陈勇; 郝凯; 尚英杰; 石俊英; 杨文魁

    2012-01-01

    目的 探讨肝硬化CT分级的临床价值.方法 对17例健康正常志愿者、54例肝硬化患者行CT灌注扫描,测量其血流量(BF)、血容量(BV)、肝动脉分数(HAF)、对比剂平均通过时间(MTT)、血管表面通透性(PS),对获得的相应灌注图进行肝硬化分级分析.结果 CT分级肝硬化程度越重,BF、BV越小,MTT、HAF、PS、肝动脉灌注量(HAP)越大.HAF、HAP在正常肝与轻、中、重度肝硬化之间有明显差异,HAF在中、重度肝硬化组明显增高.HAP在重度肝硬化组明显增高,PS、MTT在各组之间没有统计学意义.结论 通过肝脏的CT灌注研究,进一步证明了肝硬化CT分级确实与肝脏的灌注有一定关系,对临床肝硬化评估有一定价值.%Objective To evaluate the clinical value in grading of liver cirrhosis with 64-slice spiral CT perfusion imaging. Methods 17 healthy volunteers and 54 patients with liver cirrhosis underwent liver CT perfusion scanning. The blood flow(BF) , blood vol-ume(BV) , hepatic arterial fraction( HAF) , contrast agent mean transit time(MTT) and vascular permeability surface) PS) were measured on CT perfusion maps. Results CT perfusion imaging showed that the serious of cirrhosis,the lower of perfusion values of BF and BV,the higher of MTT,HAF,PS and hepatic arterial perfusionf HAP). There were significant differences between the normal liver and mild,moderate and severe cirrhosis in HAF and HAP,and HAF in moderate and severe cirrhosis of the liver was significantly increased. HAP in severe liver cirrhosis was significantly higher, PS, MTT between groups was not statistically significant. Conclusion By liver CT perfusion imaging study shows that the CT grading of cirrhosis is of certain relativity with liver perfusion, which is of significant value in evaluating cirrhosis clinically.

  3. Comprehensive Application of 64-slice Spiral CT Scan Techniques on Diagnosis Value of Nodular Goiter%64排CT的综合运用对诊断结节性甲状腺肿价值探讨

    Institute of Scientific and Technical Information of China (English)

    肖继伟; 王晓燕; 胡道予

    2014-01-01

    目的:探讨64排螺旋CT扫描技术的综合运用对结节性甲状腺肿的诊断及鉴别诊断方面的价值。方法:选择41例经过病理证实的结节性甲状腺肿,甲状腺肿瘤及其他结节性甲状腺疾病若干,全部行64排螺旋CT平扫及动态增强扫描加后续重建,观察病灶的大小、形态、密度、边缘、强化特点及有无侵犯和转移等,总结和归纳病灶的影像学表象及特征。结果:结节性甲状腺肿、甲状腺肿瘤及其他结节性甲状腺疾病在CT影像上的表现可能少部分有所重叠,但大多数趋于不同,且有一定规律可循。结论:基于64排CT扫描技术的综合运用可在很大程度上掌握结节性甲状腺肿及相似疾病的表象及特征,对结节性甲状腺肿诊断及鉴别诊断具有重要意义。%Objective:To discuss the comprehensive application of 64-slice spiral CT scan techniques on the diagnosis value of nodular goiter and its differential diagnostic value. Methods:41 cases of nodular goiter,thyroid tumors and other nodular thyroid diseases,which had been verified by pathology,were selected to conduct 64-slice spiral CT scan and dynamic contrast-enhanced scan plus follow-up reconstruction. With observing the size,shape,density,edge,enhancing char-acteristics of the lesion as well as its infringement and metastasis,imaging characteristics of the le-sion were concluded. Results:The imaging manifestations of nodular goiter,thyroid tumors and oth-er nodular thyroid diseases overlap only in small portion on CT,but mostly they are different. Con-clusion:The comprehensive application of 64-slice spiral CT scan techniques can considerably di-agnose the representations and characteristics of nodular goiter and similar diseases,which is signifi-cant to the diagnosis and differential diagnosis of nodular goiter.

  4. The analysis of diagnostic value of 64-slice spiral CT in acute mesenteric vascular embolism%64层螺旋CT对急性肠系膜血管栓塞的诊断价值分析

    Institute of Scientific and Technical Information of China (English)

    张浩亮; 杜海; 武轶非; 张凤翔

    2012-01-01

    目的 探讨64层螺旋CT血管造影对急性肠系膜血管栓塞(AMI)的诊断价值.方法 回顾性分析经64层螺旋CT全腹平扫加多期动态增强扫描诊断的15例AMI.其中,肠系膜上动脉栓塞3例(完全栓塞1例,不完全栓塞2例),肠系膜上静脉栓塞12例.结果 15例AMI直接征象:动脉期显示肠系膜上动脉完全或部分充盈缺损,可诊断为肠系膜上动脉完全或部分栓塞(3例).静脉期显示肠系膜上静脉完全或部分充盈缺损,可诊断为肠系膜上静脉完全或部分栓塞(12例);间接征象“缆绳征”12例,肠系膜水肿10例,肠管壁增厚12例,肠管扩张、积液8例,肠壁强化减弱7例,其中2例可见节段性未强化区,腹水6例,肾前筋膜增厚4例,肠壁积气2例.平扫肠系膜上动脉或上静脉高密度征7例(静脉栓塞6例,动脉栓塞1例),肠系膜上静脉栓塞累及门静脉、脾静脉6例,其中4例在增强扫描时,可见肝脏异常低灌注区.结论 64层螺旋CT平扫加多期动态增强扫描对急性肠系膜血管栓塞的诊断及时准确,应作为临床怀疑肠系膜血管疾病首选检查方法,值得推广应用.%Objective To explore the diagnostic value of 64-slice spiral CT in acute mesenteric vascular embolism. Methods We retrospectively analyzed the images of 15 AMI by multiphase dynamic contrast-enhanced 64-slice spiral CT, 3 superior mesenteric artery embolization (1 completely embolization, 2 incompletely embolization), and 12 superior mesenteric vein embolization. Results The direct signs: superior mesenteric artery was full or partial filling defect in arterial phase, and superior mesenteric vein was full or partial filling defect in vein phase. Indirect sign: there were 12 cases of "stranding sign", 10 cases of mesenteric edema, 8 cases of bowel expansion and effusion, and 6 cases with ascites, 7 cases of high density for the blood vessel by CT plain scan (6 in superior mesenteric vein embolization, 1 in superior mesenteric

  5. Value of 64-slice spiral CT with postprocessing techniques for evaluation of complications after liver transplantation%64层螺旋CT结合后处理技术对肝移植术后并发症的评估

    Institute of Scientific and Technical Information of China (English)

    丁莺; 严福华; 徐鹏举; 陈刚; 缪熙音; 曾良斌

    2011-01-01

    目的:探讨64层螺旋CT结合后处理技术在肝移植术后评估的应用价值.方法:选取50例(男40例、女10例)肝移植术后患者,行64层螺旋CT平扫、四期增强扫描及CTA检查,由两位放射科医师对图像进行评估,内容包括肝实质、血管、胆道情况及有无转移.将结果与彩超及临床随访行对照分析.结果:CT检查示:肝动脉并发症3例、门脉并发症6例、下腔静脉并发症4例、肝脏灌注不良17例、胆道并发症9例、肝脏复发8例、肺部转移5例,术后出现胸腔积液患者15例、肺部感染或肺不张者11例、腹腔积液者20例.彩超示:肝动脉显示不清、肝内动脉流速偏低者3例、门脉管腔内出现涡流者6例、胆道扩张者9例、右侧膈下或移植肝周积液者20例.结论:64层螺旋CT结合多种后处理技术,能准确客观反映肝实质、血管情况,早期发现术后并发症,提高手术成功率.%Objective : To discuss the values of 64-slice spiral CT with post-processing techniques in evaluation of post liver transplantation. Methods: Fifty patients ( 40 males,l0 females) who had received liver transplantation underwent plain scan,multiphasic contrast-enhanced scan and CTA examination. Two radiologists experienced in abdominal radiology assessed the images , including liver parenchyma , vessel, biliary complication and having or no metastasis. Findings on CT imaging were compared with those on color Doppler ultrasonography and clinical follow-up. Results : Among all the patients who received 64-slice spiral CT examination , the main findings includcd : one case with proper hepatic artery thrombosis .one case with hepatic artery stenosis,one case with proper hepatic artery pseudoaneurysm, six cases with portal vein stenosis, four cases with inferior vena cava stenosis,seventeen cases with abnormal perfusion of liver, nine cases with biliary complications , eight cases with malignant tumors recurring, five cases with pulmonary

  6. Application of low-dose 64-slice spiral CT scanning technology in adenoidal hypertrophy in children%64层CT对儿童腺样体肥大低剂量扫描的应用

    Institute of Scientific and Technical Information of China (English)

    黄冰; 杨玲; 桂绍高

    2014-01-01

    Objective To investigate clinical application value of low-dose 64-slice spiral CT scanning technology in the ade-noidal hypertrophy of children. Methods 100 cases of children with adenoidal hypertrophy underwent low-dose(group A)and con-ventional-dose (group B)64-slice spiral CT scanning. The A/N ratio,Dand radiation dose in two groups were compared. Results The A/N ratio (P=0.981) and D (P=0.199) showed no significant difference between low-dose CT scanning and conventional-dose CT scanning (P=0.981). The CTDIvol of low-dose CT scanning was 6.93mGy and the CTDIvol of conventional-doses was 27. 92mGy. The CTDIvol of low-dose CT scanning decreased about 75%as compared with those of conventional dose scanning. Con-clusion The diagnostic result of image of low dose CT scanning is the same as that of conventional dose scanning,and the low-dose spiral CT scanning in children with adenoidal hypertrophy can substitute the conventional-dose spiral CT scanning.%目的:探讨低剂量64层螺旋CT扫描技术在儿童腺样体肥大中的应用。方法对100例临床疑似腺样体肥大儿童行64层螺旋CT低剂量和常规剂量扫描,将其随机分为两组,对比两种剂量扫描的鼻咽气腔前后径A/N比值和鼻咽气腔有效气道的前后径(D值)及患者的辐射剂量。结果64层螺旋CT低剂量扫描与常规剂量扫描之间鼻咽气腔前后径A/N比值无统计学差异(P=0.981);低剂量组与常规剂量组鼻咽气腔有效气道的前后径(D值)无统计学差异(P=0.199)。低剂量CT扫描显示儿童鼻咽部容积CT剂量指数CTDIvol为6.93mGy,常规剂量CTDIvol为27.92mGy。低剂量与常规剂量相比,其CTDIvol降低了约75%的辐射剂量。结论64层螺旋CT低剂量扫描对腺样体肥大的诊断结果与常规剂量均相同,故64层螺旋CT低剂量扫描临床疑似腺样体肥大的患者,完全能替代常规剂量的64层螺旋CT扫描。

  7. 64排螺旋CT低剂量筛查肾上腺肿瘤的实验研究%Screening Adrenal Tumors with 64-Slice Spiral CT in Low Dose:an Experimental Study

    Institute of Scientific and Technical Information of China (English)

    亓波; 王小红

    2011-01-01

    Objective The purpose of this study was to probe into the optimal scan param eters in low dose when sereening adrenal tumors with 64-slice spiral CT, in order to make itm ore popular in clinical application .Materials and .Methods Wehad selected 30 adrenal tumors patients ( 15 male and 15 fem ale ;between 28 and 67 years old ;mean age 38 years old ) maken a definite diagnosis in general hospital of Jilin Chemical lndustry from June 2009 to June 2010 .All of the selected adrenal tumors patients were confirmed by surgical pathology .Control group; 10 healthy volunteers.Both cases and controls were scanned on a 64-slice spiral CT under auto tube current modulation mode with com blnations of serval param eters ;noise index (NI):8/12/15/18/21/24/27/30/33;tube voltage (TV) :140 kV/120 kV/100 kV/80 kV ;rotation time (RT): 0.4 s/0.5 s.The datum were reconstructed per 0.625m m and then transferred to the ADW 4.3 workstation .Using adrenal imaging special softwate to reconstruct adrenal im aging .An radiologist who has more than 10 years work experience had scored the com prised imaging recorded doze length product (DLP) .The relations between DLP and NI/TV/RT and the relations between IQS and NI/DLP/TV/RT were analyzed through partial correlation .Results Coefficient ofpartial correlation between DLP and NI was- 0.613 (P<0.01) ;Coefficient of partial correlation between DLP and TV was 0 .198 (P>0 .05) ;Coefficient of partial correlation between DLP and RT was -0.054 (P>0.05) .Conclusion The optimal param eters of 64-slice spialCT cobnography was a com bination of 120 kV (TV) ,12 (NI) ,0.5s(RT ) under the auto tube current modulation mode .The dose of screening adrenal tum ors with w ith 64-slice spiral CT using the scan com binated patam eters was about 18.6% of fixed tube current TV ,NI and RT can be used as low dose scan param eters when screening adrenal tumors with 64-slice spiral CT.%目的 探索适用于64层螺旋CT肾上腺成像筛查肾上腺肿瘤的低

  8. 64层螺旋CT对寰椎椎动脉沟环综合征的诊断价值%The diagnostic value of 64-slice spiral CT on atlas vertebral artery sulcus ring syndrome

    Institute of Scientific and Technical Information of China (English)

    路明; 陈穹; 汪茂文; 王钢; 陈小昕; 虞鲲

    2012-01-01

    目的 探讨64层螺旋CT对寰椎椎动脉沟环综合征的诊断价值.方法 收集因常规颈椎正侧位X线检查发现的寰椎椎动脉沟环患者48例,进行64层螺旋CT容积扫描后,进行容积重建和多平面重建,多方位显示寰椎结构形态及寰枢关节间隙,并探讨其与临床症状之间的关系.结果 48例寰椎椎动脉沟环患者中,右侧完整环型24例,孔径(6.59±0.50)mm,左侧完整环型36例,孔径(6.19±0.49)mm,右侧不完整环型24例,左侧不完整环型12例.30例诊断为寰椎椎动脉沟环综合征,均有寰枢关节不稳及不同程度头颈转动性眩晕症状.结论 64层螺旋CT能清晰显示寰椎后弓桥的解剖结构和测量寰椎椎动脉沟环的孔径,结合对枕颈失稳的判断,对寰椎椎动脉沟环综合征具有重要的诊断价值.%Objective To explore the diagnostic value of 64-slice spiral CT on atlas vertebral artery sulcus ring syndrome.Methods The 48 atlas vertebral artery sulcus ring patients who were found by conventional anterior posterior and lateral X-ray film were collected.The 64-slice spiral CT volume scan and following volume restitution(V R)and multiplanar reconstruction(MPR)were underwent,and multi-directional structural morphology was displayed.Their relationship with clinical features were analyzed.Results Among 48 cases of atlas vertebral artery sulcus ring,24 cases were shown with right complete bridge[pore size(6.59±0.50)mm],36 cases with left complete bridge[pore size(6.19±0.49)mm],24 cases with right incomplete bridge and 12 cases with left incomplete bridge.Thirty cases were diagnosed as atlas vertebral artery sulcus ring syndrome,and all had the atlantoaxial joint asymmetry and vertigo of different degree when head and neck rotated.Conclusions The 64-slice spiral CT can clearly display the anatomical features of posterior bridge of atlas and measure the pore size of atlas vertebral artery sulcus ring,and it has important diagnostic value for atlas

  9. The application value of 64-slice spiral CT in the diagnosis of occult rib fracture%64层螺旋CT在隐匿性肋骨骨折诊断中的应用价值

    Institute of Scientific and Technical Information of China (English)

    迟宝权; 刘亚静; 康洁

    2011-01-01

    Objective To evaluate the diagnostic value of 64-slice spiral CT and post-reconstruction technique in the diagnosis of occult rib fracture. Methods 42 patients with suspected chest trauma and occult rib fracture were examined by 64-slice spiral CT scan. All the original images were transferred to workstation to be post-processed to obtain volume rendering ( VR ) , maximum intensity projection ( MIP), multiplanar reformation (MPR) ,curved planar reformation(CPR) images in order to reveal occult rib fractures clearly. The abilities in displaying occult rib fractures were compared among VR, MIP, MPR, and CPR. Results The comprehensive application of various reconstruction techniques could show clearly the different parts and different types of occult rib fractures. The CPR reconstruction was the best one of them in displaying occult rib fractures,as compared with MPR and VR. A total of 59 parts of occult rib fracture were diagnosed in 42 patients with chest trauma. Conclusion The 64-slice spiral CT and post-reconstruction technique to treat the images can show clearly occult rib fracture, and can meet the positioning and qualitative analysis for occult fracture ribs,so which is the preferred method for detecting occult rib fracture.%目的 探讨64层螺旋CT及其后重建技术在隐匿性肋骨骨折诊断中的临床应用价值.方法 对42例胸部外伤考虑隐匿性肋骨骨折患者,进行64层螺旋CT平扫,将所得原始数据经工作站进行图像后处理,获得容积再现(VR),最大密度投影(MIP),多平面重组(MPR)、曲面重建(CPR)图像.并比较各种重建图像对隐匿性骨折的显示能力.结果 综合运用各种后重建技术,可清晰显示不同部位、不同类型肋骨隐匿性骨折.重建以CPR技术显示效果最佳,MPR、VR次之.42例胸部外伤患者共确诊59处肋骨隐匿性骨折.结论 64层螺旋CT及其后重建技术图像显示清晰,满足对肋骨隐匿性骨折进行定位、定性分析,是肋骨隐匿性骨折检查首选方法.

  10. 64排螺旋CT在泌尿系三维成像检查中的影响%Effects of 64 slice spiral CT 3D imaging in urinary system

    Institute of Scientific and Technical Information of China (English)

    王强

    2013-01-01

    Objective To investigate the clinical value of 3D imaging exams after 64-slice spiral CT scan.Methods Conventional thin plain scan and arterial phase,venous phase,delayed phase scans to 50 patients with urinary tract diseases were performed respectively by applicating 64-slice spiral CT,then,the data were transferred to the imaging workstation for MPR,VR and MIP and other 3D reconstruction,ifnally,a comprehensive analysis was made to all image data.Results kidney or ureteral stones in 33 cases,occupying of kidney,ureter or bladder in 8 cases,inflammation in 6 cases,congenital malformations in 2 cases,ureteral clot in 1 case.Conclusion 3D imaging exams after 64-slice spiral CT scan has a reliable value to the diagnosis of urinary tract disease,it can not only get a clear kidneys,ureter and bladder dimensional reconstructed images,but also accurately display the urological global and local ifne structure,shape,extending direction and its relationship with the surrounding tissue.In addition,the image can be made rotation,cutting,ampliifcation and other post-processing.%目的:探讨64排螺旋CT在泌尿系三维成像检查中的临床应用价值。方法抽取来我院就诊的泌尿系疾病患者50例,应用64排螺旋CT分别行常规薄层平扫及动脉期、静脉期、延迟期扫描,并将所得数据传输至影像工作站进行MPR、VR及MIP等三维重建,对其影像资料进行综合分析。结果肾或输尿管结石33例,肾、输尿管或膀胱占位8例,炎症6例,先天性畸形2例,输尿管内血块1例。结论64排螺旋CT三维成像检查不仅能够获得清晰的双肾、输尿管及膀胱的三维重建图像,而且能够准确地显示出泌尿系统整体和局部的细微结构、形状、走形及其与周围组织关系,还可对图像进行旋转、切割、放大等后处理操作,对于临床诊断泌尿系统疾病具有可靠价值。

  11. 混合性生殖细胞瘤的64层螺旋CT诊断及病理表现%Diagnosis of mixed germ cell tumor by 64-slice spiral CT and pathological manifestations

    Institute of Scientific and Technical Information of China (English)

    朱刚明; 谭琦碹; 钟胜; 李兆勇; 付东

    2011-01-01

    目的:探讨64层螺旋CT对混合性生殖细胞瘤的诊断价值.方法:回顾性分析7例经病理证实的混合性生殖细胞瘤的CT平扫及两期增强表现、病理标本及切片特征.结果:7例病灶3例位于卵巢,3例位于前纵隔.1例位于睾丸;其中3例边界清楚;各病灶密度不均匀,内见囊变、坏死区,1例可见脂肪及钙化:增强扫描静脉期较动脉期强化明显,均呈不均匀强化.病理结果2例卵黄囊瘤与成熟畸胎瘸混合型.2例卵黄囊瘤与未成熟畸胎瘤混合型.1例卵黄囊瘤、胚胎性癌、畸胎瘤混合型,1例绒癌与无性细胞癌混合型,1例精原细胞瘤、胚胎性癌、滋养细胞成分混合型.结论:64层螺旋CT对混合性生殖细胞瘤的诊断虽无特异性,但在一定程度上为肿瘤良恶性判断、临床分期提供十分重要的依据.%Objective:To investigate the diagnostic value of mixed germ cell tumor by 64 -slice spiral CT. Methods: The plain CT and two-phase enhanced CT scanning and pathological specimens of 7 cases of the tumor confirmed by pathology were retrospectively studied. Results: 3 cases were found in ovarian and 3 cases in anterior mediastinum and 1 case in testis. 3 lesions were clear boundary, with fat and calcification in 1 lesion. All the lesions were uneven density and the cystic or necrotic area could be found. Venous phase enhancement was significantly higher than other phase, showed inhomogc-neous enhance. Pathological findings: induded 2 cases of yolk sac tumor and mature teratoma mixed. 2 cases of yolk sac tumor and immature teratoma mixed, 1 case of yolk sac tumor embryonal carcinoma and teratoma mixed. 1 case of chorio-carcinoma and asexual cell carcinoma mixed, and 1 case of seminoma embryonal carcinoma and trophoblastic ingredients mixed. Conclusion: Although there is no specific by 64-slice spiral CT. To a certain degree.it can determine the benign or malignant tumor and give the important prop for clinical staging.

  12. The comparison of imaging quality between bolus-triggering and test-bolus technique used in 64-slice spiral CT angiography of lower extremity arteries

    International Nuclear Information System (INIS)

    Objective: To investigate the clinical value of multi-slice CT angiography (MSCTA) of lower limbs in patients with peripheral arterial occlusive disease (PAOD) using the test-bolus technique. Methods: Forty-four patients with PAOD were enrolled consecutively in the study. In group 1, 18 subjects underwent CTA by bolus triggering method and in group 2, 26 subjects underwent CTA by test-bolus technique. During scanning procedure in group 2 subjects, the bolus transit time to aorta (TAO), popliteal arteries (TPOP) and aorto-popliteal bolus transit time (Tt) were calculated through dynamic acquisition at their respective level and the delay time were immediately set as TAO and scan time as double Tt. Two independent senior attending physicians with training experience in interpreting CTA determined the quality of each arterial segment visualization based on 5 parameters (1. visible farthest branch, 2. clarity of vessels border, 3. presence of venous contamination, 4. grading of stenosis, 5. CT value at 4 arterial segments). Inter-observer agreement on imaging quality between readers was evaluated using Cohen's k statistic by calculating K values. χ2 test and t test were used to compare the quality of images in both groups. Results: In group 2 patients, a larger individual variation in transit time of the contrast to reach aorta was obserued [TAO=(17.1±2.6) s with a range of 12.0-22.0 s] and aorto-popliteal transit time [Tt=(14.8±5.5) s with a range of 8.0-24.0 s]. CTA of group 2 patients demonstrated better quality over group 1 patients' CTA, especifically in the infra-popliteal and foot area arteries. There was an excellent inter-observer agreement for group 2 patients (K>0.80) whereas in group 1 agreement in infra-popliteal segments for venous contamination (K value 0.60) and stenosis degree (K value 0.50) were not satisfactory enough. Group 1 patients were reported to have more severe stenosis in infra-popliteal and foot arteries (χ2=30.55 and 22.41, P<0

  13. 肺癌特异血管征象的64层CT首过期灌注增强表达%Expressing the specific vessels signs in lung cancer by 64-slice spiral CT in first phase perfusion imaging *

    Institute of Scientific and Technical Information of China (English)

    苏冠琴; 薄晓庆; 杨署; 孙国鹏; 柴军; 周苛; 高阿枚; 段呼兵; 董秀萍

    2013-01-01

    Objective To investigate the specific vessels signs in lung cancer by 64-slice spiral CT in first phase perfusion ima-ging so as to get more reasonable time about CT angiography .Methods Among the 47 cases ,there were 38 cases of central and 9 cases of peripheral primary lung cancer underwent 64-slice spiral CT in first phase perfusion imaging :one scan was obtained every 1 seconds during 8-38 seconds with 8 section × I without scanning interval after injection .Precontrast and postcontrast attenuation on every leisions was recorded ,to calculate the peak height(PH) and peak height time by time density curves TDC of pulmonary le-sions to aorta ,those reflect the the tumor feeding artery Imaging about lesions of lung cancer and inflammation .observed and calcu-lated the display rate and display time of lesions of lung cancer and inflammation .means of t test was used for statistics .Results a-bout the peak heights of in pulmonary artery and aorta phese ,statistically significant differences were found between inflammation and lung cancer(P0 .05) . about the peak heights time in aorta phase ,no statistically significant differences were found among three groups (P>0 .05) .The tumor vascularity were discoved in lesions in patients with lung cancer (44/47 cases ,93 .62% );The erosion narrow pulmonary ar-tery were discoved in central lung cancer (37/38 cases ,97 .37% ) ,in peripheral lung cancer(6/9 cases 66 .67% );no abnormal pulmo-nary artery were discoved only in 4 patients with lung cancer .Both tumor vascularity and abnormal pulmonary artery were most dis-plaied in 18-31s in CT angiography .Conclusion 64-slice spiral CT in first phase dynamic perfusion imaging can order completely show the specific vessels signs in lung cancer and reflect the tumor feeding artery Imaging of lung cancer .Analysising those benefi-ted to select reasonably the time of CT angiography and Improve the rate of lung cancer diagnosis .%目的分析64层C T首过期灌注增强对肺癌特

  14. Moyamoya Disease:Diagnostic Value of 64-slice Spiral CT Angiography%烟雾病64层螺旋CT血管成像的诊断价值

    Institute of Scientific and Technical Information of China (English)

    李杨; 杨峰; 余河

    2012-01-01

    目的:探讨烟雾病64层螺旋CT血管成像(MSCTA)的表现,评价其临床诊断价值.方法:收集行64层螺旋CT平扫及血管成像检查并临床确诊的烟雾病患者27例,在ADW4.3工作站上对原始图像做二维及三维处理:容积再现(VR)、最大密度投影( MIP)、剪影后容积再现、多平面重组(MPR)及曲面重组(CPR),总结烟雾病的64层螺旋CT血管成像特点.结果:27例双侧颈内动脉远段、大脑前动脉及中动脉近端狭窄、闭塞20例,单侧大脑中动脉闭塞5例,双侧大脑前动脉并大脑中动脉狭窄、闭塞2例,5例双侧大脑后动脉代偿性增粗;3例合并基底动脉动脉瘤,2例合并大脑后动脉动脉瘤;27例均可见周围紊乱血管影,相应血管及其分支粗大、增多、迂曲延长.VR图像有利于显示狭窄闭塞段与周围骨性结构空间关系,但在显示评价脑底增生小血管和侧支血管方面不及MIP和MPR.结论:64层螺旋CT血管成像(MSCTA)可以清晰的显示烟雾病血管改变特点及周围侧支血管网,检查方法简单、快捷、无创伤,容积再现及剪影后容积再现可以直观显示病变周围空间结构关系,可作为诊断烟雾病的首选诊断方法.%Objective To explore the 64-slice spiral CT angiography (MSCTA) findings and clinical value for diagnosis of moyamoya disease. Methods Seventeen patients with moyamoya disease underwent routine CT scanning and MSCT angiography. All the patients were confirmed by DSA. The angiograms obtained were processed on the ADW4.3 workstation to perform volume rending(VR) , maximum intensity projection (MIP) and multiplanar Volume refomration (MPR) and curved planar reformatting( CPR). Results In all cases MSCTA showed the stenosis or obstruction of arteria carotis interna( ICA) or proximum of Wills circle, abnormal vessel network in brain basal part, including stenosis of bilateral ICA and anterior cerebral artery and middle cerebral artery(20 cases) ,one side middle

  15. Application of 64 slice spiral CT angiography in subarachnoid hemorrhage%64层螺旋 CT 血管成像在自发性蛛网膜下腔出血中的应用

    Institute of Scientific and Technical Information of China (English)

    韩璐璐; 张锡海; 张爱霞; 王俊英; 董乐

    2015-01-01

    目的:为了进一步提高临床对自发性蛛网膜下腔出血(SAH)的治疗效果,分析和探讨64层螺旋 CT血管成像在自发性 SAH 中的应用价值。方法按照随机双盲的原则抽取2014年1月-2015年1月治疗的38例考虑自发性 SAH 的患者作为研究对象,所有入组的患者均常规给予64层螺旋 CT 血管成像(CTA)及数字减影脑血管造影(DSA)检查,其中 CT 血管成像均应用最大密度投影(MIP)、容积再现技术(VR),通过和 DSA 结果对比分析 CTA 在发现自发性 SAH 中的病因诊断中的应用价值和意义。结果以 DSA 诊断结果作为评价标准,CTA 的诊断结果准确率和 DSA 相比较,差异亦无统计学意义(P ﹥0.05);而 CTA 组在诊断血管瘤大小方面和 DSA 诊断结果准确率和 DSA相比较示,差异无统计学意义(P ﹥0.05)。结论临床上在诊断自发性 SAH 的过程中应用64层螺旋 CT 血管成像,不仅简单、快捷和方便,而且有利于发现病因和提高诊断准确率,值得推广。%Objective To further improve the effectiveness of our hospital in terms of t spontaneous subarachnoid hemorrhage(SAH)and to reduce and prevent the occurrence probability of a variety of adverse events,analysis and discussion of the meaning and value of 64-slice CT angiography(CTA). Methods Selected 38 cases of patients with spontaneous sub-arachnoid hemorrhage(SAH)in our hospital from January 2014 to January 2015 according to the randomized double blind controlled principles as a study object,all patients with acute SAH underwent 64-slice CTA and digital subtraction angiography (DSA). Three-dimensional post-processing techniques including volume rendering( VR),maximum intensity projection (MIP),curved planar reformation(CPR)and multi-planar reconstruction(MPR)were underwent. Results Taking the DSA result as the standard,CTA diagnosis accuracy compared with DSA the difference between the two groups weren

  16. Application of three-dimensional reconstruction based on 64-slice spiral CT scanning in the diagnosis and preoperative evaluation of neonatal type (Ⅲ) congenital esophageal atresia%64排CT三维重建在新生儿(Ⅲ)型食道闭锁诊断和术前评估中的应用价值

    Institute of Scientific and Technical Information of China (English)

    李春; 陈启雄; 余加林; 张先红

    2014-01-01

    目的:研究64排CT三维重建在新生儿型食道闭锁诊断和术前评估中的应用价值。方法回顾性分析56例先天性食道闭锁患儿的64排CT影像学资料,并与食道造影及手术结果进行对照研究。结果56例患儿均行食道造影及64排CT三维重建,其中35例食道闭锁型患儿接受手术治疗。64排CT食道重建及食道造影在先天性食道闭锁的诊断符合率相近,并能准确显示瘘口位置。35例患儿64排CT三维重建与手术所见食管两盲端距离吻合。结论64排CT三维重建在显示和评价型闭锁食管两盲端距离和瘘口位置是可靠的,可为新生儿型食道闭锁术前估计与制定合适的手术方案提供更加可靠的影像学依据。%Objective To study the clinical value of 3-dimensional (3D) reconstruction based on 64-slice spiral CT scanning data in diagnosis and preoperative evaluation of neonatal type  congenital esophageal atresia (CEA). Methods The 64-slice spiral CT data of 56 cases with CEA were analyzed retrospectively and correlated to the findings of esophagography and surgery.Results 56 cases were examined by 64-slice spiral CT and esophagography, and 35 cases of type  CEA undergo operation therapy.The rate of coincidence of diagnostic between 64-slice spiral CT and esophagography was getting very close, and 64-slice spiral CT can clearly reveal the orifice of fistula. Among 35 cases,the distance between the two esophageal extremes of 64-slice spiral CT scanning were coincided with operative findings.Conclusions 64 slice spiral CT 3-D reconstruction is a reliable technique for showing and assessing the distance between the two esophageal pouches,and position of fistula in CEA,and can afford the reliable evidence in the preoperative assessment of neonatal type  CEA and accurate establishment of surgical plan.

  17. 64层螺旋CT灌注成像在乳腺疾病诊断中的应用研究%APPLICATION OF 64-SLICE SPIRAL CT PERFUSION IMAGING IN THE DIAGNOSIS OF BREAST DISEASES

    Institute of Scientific and Technical Information of China (English)

    曾勇; 吴垦; 黎学刚

    2011-01-01

    [目的]进行64层螺旋CT灌注成像研究,探讨该技术在乳腺疾病诊断中的应用前景.[方法]选择于2008年5月~2009年5月期间临床检查或钼靶检查怀疑有乳腺疾病的61例女性患者行CT灌注扫描.按照病理将其分为3组:增生病组(n= 14)、纤维腺瘤组(n=19)和乳腺癌组(n=20),并将所有患者对侧乳腺定为正常组(n=61).进行灌注序列body perfusion扫描及Perfusion 3体部灌注软件处理,计算感兴趣区的血流动力学参数血流量(BF)、平均通过时间、血容量(BV)(MTT)和表面通透性(PS),统计分析不同组间的测量值.[结果]与乳腺癌组比较,正常组BF、BV及PS的差异均有统计学意义(P<0.05),MTT的差异无统计学意义(P>0.05);正常乳腺组与纤维腺瘤组、增生病组比较,BF及BV的差异均有统计学意义(P<0.05),MTT及PS的差异均无统计学意义(P>0.05);乳腺癌组与纤维腺瘤组比较,其BF、PS的差异有统计学意义(P<0.05),BV及MTT的差异无统计学意义(P>0.05);乳腺癌组与增生病组比较,其BF、BV及PS的差异均有统计学意义(P<0.05),MTT的差异无统计学意义(P>0.05);增生病组与纤维腺瘤组比较,其BF、BV、MTT及PS的差异均无统计学意义(P>0.05).正常组与乳腺癌组分别呈低灌注、高灌注状态,纤维腺瘤组及增生病组均呈较高灌注状态.[结论]64层螺旋CT作为先进的影像检查技术,其灌注成像能从血流动力学和影像学角度为各类乳腺疾病的进行较为准确的诊断.%[Objective] To study and evaluate multi-slice spiral CT perfusion imaging in the diagnosis of breast diseases the effect and value. [Methods] 61 patients through clinical examination or mammography of women with suspected breast disease patients with 64-slice spiral CT perfusion imaging. The pathology types were divided into three groups: hyperplasia group (n = 14), fibroadenoma group (n - 19) and breast cancer group (n = 20), and conlralaterai

  18. The Diagnostic Value of Warthin Tumor in Parotid Gland at 64-slice Spiral CT%64层螺旋CT对腮腺Warthin瘤的诊断价值

    Institute of Scientific and Technical Information of China (English)

    朱刚明; 谭琦瑄; 李扬彬; 刘晓; 李兆勇

    2011-01-01

    目的 研究分析腮腺Warthin瘤的多层螺旋CT影像表现,探讨64层螺旋CT对腮腺Warthin瘤的诊断价值及合理扫描方案.资料与方法 回顾性分析15例经手术及组织学病理证实的腮腺Warthin瘤的CT平扫及两期增强表现.结果 15例腮腺Warthin瘤患者中7例单侧发病,8例双侧发病,总共26个病灶;位于腮腺浅叶后下部22个,其他部位4个;20个病灶呈结节状,径线范围为0.8~4cm;其中23个边界清楚,12个密度均匀,14个病灶内见囊变区,3个病灶内可见钙化.两期增强扫描中动脉期各病灶呈中度至明显强化,静脉期21例病灶密度降低,5例与动脉期相近,病灶内囊变区两期增强均未见强化.结论 64层螺旋CT对于腮腺Warthin瘤的诊断具有很强的实用性,合理的扫描方案能提高该疾病的诊断准确率.%Purpose To analyze multi-slice spiral CT images of parotid Warthin tumor, and investigate its diagnostic value and make a reasonable scan protocol. Materials and Methods The plain and two-phase enhanced CT characteristics of 15 cases of Warthin tumor confirmed by surgery and histological pathology were retrospectively analyzed. Results There were total 26 lesions in 15 cases, 7 cases with lesions in unilateral side and 8 cases in bilateral sides. 22 lesions located in the superficial lobe, 4 lesions in other parts. 20 lesions were nodular, the diameters were in the range between 0.8 ~ 4cm. 23 lesions were clear boundary, 12 lesions were homogeneous. Cystic areas were found in 14 lesions and calcification in 3 lesions. All lesions showed significantly enhancement in the arterial phase. The density of 21 lesions were decreased in vein phase, 5 lesions had similar density to that in the arterial phase. Cystic areas were not enhanced in both phases. Conclusion 64-slice spiral CT is useful in the diagnosis and differential diagnosis of Warthin tumor. Making a reasonable scan protocol can improve accuracy of the diagnosis and differential

  19. MSCT血管成像对肝移植受体术前血管结构的评价%The evalution of the vascular structure of preoperative liver transplantation recipients using 64-slice spiral CT angiography

    Institute of Scientific and Technical Information of China (English)

    李妙玲; 刘雯雁; 袁会军; 强永乾; 孙兴旺; 赵婷婷

    2011-01-01

    Objective To evaluate the clinical significance of 64-slice spiral CT angiography for vascular structures of preoperative liver transplantation recipients. Methods Tri-phase enhanced CT scan were performed in 32 cases, All cases were post-processing with maximum intensity projection(MIP) , volume rendering(VR) ,and all reformation images with axial images were analyzed. Results In all 32 cases, 1 case with absence of celiac artery, 3 cases with stenosis of celiac artery caused by plaque, 12 cases with dilated splenic artery, 2 cases with splenic artery aneurysm, 7 cases with variation of hepatic artery. 3 cases with extrahepatic portal vein thrombosis, 2 cases with intrahepatic portal vein thrombosis, 1 case with thrombosis in superior mesenteric vein, 1 case with muti-ple thrombosis in portal vein and superior mesenteric vein. In all 32 cases, 25 cases with good images of hepatic vein, 14 cases with standard hepatic vein, 11 cases with common drainage of the middle and the left hepatic vein into the inferior vena cava, and 1 case with inferior hepatic vein respectively,? Cases with poor images. In all 32 cases,30 cases with normal inferior vena cava, 1 case with embolism in inferior vena cava and 1 case with embolism near the right atrium. In all 32 cases, 24 cases received liver transplantation successfully, the other 8 cases had the contraindications of liver transplantation and gave up operation,of 8 cases, 3 cases with total diameter of cancer nodules were more than 8 cm,l case with mutiple thrombosis, 4 cases with extrohepatic metastasis(including 1 case with total diameter of cancer nodules were more than 8 cm) , 1 case with Michels MD had narrowing hepatic artery and the diameter was less than 3 mm separately. Conclusion 64-slice spiral CT tri-phase angiography could overall evaluate structural changes of the hepatic vessels and choose the cases suitable for surgery,it has an important value for surgery program.%目的 探讨64排螺旋CT血管成像对肝

  20. Preliminary study of the optimization of abdominal CT scanning parameters on 64-slice spiral CT%64层螺旋CT腹部扫描参数优化的初步研究

    Institute of Scientific and Technical Information of China (English)

    胡敏霞; 赵心明; 宋俊峰; 周纯武; 赵红枫

    2011-01-01

    Objective To investigate the appropriate low tube current of abdominal CT on a 64-slice spiral CT. Methods (1) Phantom study:The phantom Catphan500R was scanned with a fixed 120 kVp,and 450,400,380,360,340,320,300,280 mA, respectively. 15, 9, 8, 7, 6 mm diameter low-contrast objects with 1% contrast were scanned for evaluating image quality. CT images were graded in terms of lowcontrast conspicuity by using a five-point scale. Statistical analyses were performed to determine the appropriate tube current and the interval leading to the qualitative change. (2) Clinical study: 3 groups of 45 patients who had 2 examinations of non-enhanced abdominal CT within 3 months were enrolled. All patients were scanned with 450 mA at first scanning. For the second scanning, group-1 was scanned with optimal tube current, group-2 was scanned with optimal tube current plus interval, group-3 was scanned with optimal tube current sinus interval. CT images were graded in terms of the diagnostic acceptability at three anatomic levels including porta hepatis, pancreas and the upper pole kidney, and the image noises of eight organs including abdominal aorta, portal vein, liver, spleen, gallbladder, pancreas, renal cortex, renal medulla were graded by using a five-point scale. The image quality was compared with non-parametric rank sum test,and the individual factors of the patients were compared with the A VONA. Results (1) The optimal tube current and interval leading to the qualitative change were 340 mA and 40 mA respectively. (2) There were no significant differences in image quality between 340 mA and 450 mA in group-1, between 380 mA and 450 mA in group-2 (P > 0. 05). There was significant difference in image quality between 300 mA and 450 mA in group-3 (the mean scores for 300 mA were 2. 92 ± 0. 62,2.92 ± 0. 62,2.64 ± 0. 84,2. 72 ±0.82,2.63 ±0.71,2.51 ±0.84,3.04 ±0.72,3.04 ±0.72,2.63 ±0.71,2.52 ±0.73,2.93 ±0.81respectively; for 450 mA were 3.93 ± 0. 72,3.94 ± 0. 72

  1. Application of Low Dose Contrast Medium in 64-slice Spiral CT Angiography of Craniocervical Arteries%低剂量对比剂在64排CT头颈部血管联合成像中的应用

    Institute of Scientific and Technical Information of China (English)

    杨春燕; 侯新川; 梅友泉

    2012-01-01

    目的 评价低剂量对比剂在头颈部CT血管联合成像中的动脉分级能力及图像质量效果.资料与方法 搜集1183例行64排CT头颈部血管联合成像患者的资料,按对比剂注射剂量不同将患者分为低剂量组(n=708)和常规剂量组(n=475).观察容积重建图像上患者颈总动脉、颈内动脉颈段、颈内动脉岩骨段至颅内段、大脑前动脉及其主要分支血管的显示情况,根据最大密度投影上血管质量评分判定图像质量.结果 两组头颈部动脉血管及脑内较大分支在容积重建图像上显示良好,且最大密度投影图像上多数血管显示清晰,边缘光滑锐利.低剂量组和常规剂量组各段血管的显示率及图像质量评分差异均无统计学意义(P>0.05).结论 低剂量对比剂在CT头颈部联合成像上可以很好地显示颅内血管,且具有较高的图像质量.%Purpose To assess the effect of low dose contrast medium in arteries grades and the scoring of image quality in CT angiography of craniocervical arteries. Materials and Methods Imaging data of 1183 patients with 64-slice spiral CT angiography of craniocervical arteries were randomly divided into two groups: low dose contrast medium group (708 cases) and conventional dose contrast medium group (475 cases). Display of the vessels on volume rendering images were observed, including common carotid arteries, cervical segment of internal carotid arteries, petrous segment to cerebral segment of internal carotid arteries, anterior cerebral arteries and their main branches. The image quality was evaluated on maximum intensity projection images. Results The craniocervical arteries and greater rami of cerebral arteries of the two groups were well displayed on volume rendering images. On maximum intensity projection, most of the arteries showed clearly with glabrous and sharp borders. There was no significant difference in revealing rate of arteries grades and image quality scores between

  2. Application of 64-slice spiral CT angiography in the diagnosis of tetralogy of fallot%64层螺旋CT血管造影在法洛四联症诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    陈红; 曹成瑛; 朱友义; 王生元; 罗焕; 周署泉

    2011-01-01

    目的:探讨64层螺旋CT血管造影(64-SCTA)诊断法洛四联症(tetralogy of Fallot,TOF)的应用价值.方法:回顾性分析23例TOF患者的64-SCTA诊断结果,并与心脏超声(UCG)和手术进行对比.结果:23例TOF患者经64-SCTA和UCG都能发现和准确诊断TOF的4种主要畸形,室间隔缺损大小、主动脉骑跨程度、右室流出道狭窄、右室前壁厚度以及主肺动脉内径的测量结果与手术结果比较均差异无统计学意义(均P>0.05);64-SCTA检出体肺侧支动脉血管6例,UCG仅检出1例,二者比较,差异有统计学意义(P<0.01).结论:64-SCTA能客观清晰地显示TOF的4种畸形,在心外大血管畸形诊断方面较UCG有明显的优势,是准确诊断TOF无创性检查的理想选择.%Objective!To evaluate the advantage and limitation of 64-slice spiral CT angiography (64-SCTA) in diagnosing tetralogy of fallot (TOF). Method:64-SCTA findings of 23 patients with TOF were retrospectively ana-lyzed comparatively with cardiac ultrasound and surgery. Result:Four major malformations of TOF could be accu-rately diagnosed by both 64-SCTA and cardiac ultrasound. There was no significant statistically difference (P> 0. 05) compared with that of surgery in evaluating the ventricular septal defect size, degree of aortic cross-riding, stenosis of right ventricular outflow, as well as internal diameter of main pulmonary, left and right pulmonary ar-tery, the right ventricular wall thickness were no significant statistically difference (P>0. 05) measured by 64-SC-TA and cardiac ultrasound, but 64-SCTA had more advantages than cardiac ultrasound in diagnosing the extracar-diac malformation (P<0. 01) , for the detection of lung body collateral arteries by 64-SCTA in 6cases, while only lease by cardiac ultrasound. Conclusion: Four major malformations of TOF could be objectively and clearly diag-nosed by 64-SCTA. In diagnosis of great extracardiac vessel malformations, 64-SCTA is significantly superior to UCG. 64

  3. 64-slice CT imaging in a case of total anomalous pulmonary venous circulation

    International Nuclear Information System (INIS)

    For long, catheter angiography has been the investigation of choice for the diagnosis of congenital anomalies of the heart such as total anomalous pulmonary venous circulation (TAPVC). In the last few years, MRI and multislice CT scan have also been introduced for this purpose. We report a case where 64-slice CT scan was found very useful in the evaluation of TAPVC

  4. 64排螺旋CT三维重建技术在颌骨埋伏阻生牙定位中的应用价值%Application Value of Three-dimensional Reconstruction Technique of 64-slice Spiral CT in Diagnosis of Impacted Teeth within Jaw Bone

    Institute of Scientific and Technical Information of China (English)

    谢友扬; 潘功茂; 施君; 孟庆乐; 夏云宝

    2012-01-01

    目的:探讨64排螺旋CT三维重建技术对颔骨内埋伏阻生牙的定位及临床应用价值.方法:对33例临床疑似埋伏阻生牙患者行64排螺旋CT容积扫描,利用GEAW4.4工作站对数据进行多平面重组(MPR)、容积再现技术(VRT)重组图像.结果:33例阻生牙患者中,切牙8颗,侧切牙5颗,尖牙11颗,第三磨牙5颗,多生牙9颗.结论:64排螺旋CT三维重建能准确显示颔骨内埋伏阻生牙及多生牙的数量、位置、形态及萌出方向,为临床提供可靠的指导信息.%Objective To discuss the value of three-diniensiona)(3D) reconstruction technique of 64-slice spiral CT in the diagnosis of impacted teeth within the jaw bone, Methods Thirty-three suspected eases of impacted teeth were examined by 64-slice CT volume scan. The acquired data were processed by multi-planar reconstruction(MPR), volume rendering technique(VRT) using GEAW4.4 workstation. Results Impacted teeth consisted of 8 centra! incisors, 5 lateral incisors, 11 canine teeth, 5 cranters and 9 accessory teeth were detected from all the 33 patients. Conclusion The 3D reconstruction technique of 64-slice spiral CT could display the details of impacted teeth, including the shape, location and eruption orientation. It can provide valuable information for diagnosis.[Chinese Medical Equipment Journal.2012,33(5):76-77

  5. 64层螺旋CT血管成像诊断大脑中动脉成窗变异%CT Angiography Features of Fenestration Variation in the Middle Cerebral Artery Using 64-slice Multidetector Spiral CT

    Institute of Scientific and Technical Information of China (English)

    袁飞; 刘银社; 常爱华; 赵军; 顾欣; 冯凯琳

    2011-01-01

    目的 探讨大脑中动脉成窗变异的发生率及CT血管成像(CTA)特征,提高对该血管变异的认识.资料与方法 2007年11月至2010年1月本院共有2734例患者行头颈联合64层CTA检查,其中14例确诊为大脑中动脉成窗.回顾性分析大脑中动脉成窗的发生率、部位、形态等CTA特征及其合并症.结果 (1)14例患者共15个大脑中动脉成窗,发生率为0.51%(14/2734).M1段近端成窗12个,占80%;M1段远端成窗2个,占13.3%,均由一支桥血管与M1段远端及M2段近端构成;M1段中部成窗1个,占6.7%.M1段近端成窗中,9个成窗位于大脑中动脉起始部,3个成窗由一支桥血管与M1和A1近端三支血管组成.(2)2个"窗"径较小者(<2 mm)呈孔状,13个"窗"径较大者中,10个分支粗细不等呈"OK"手势样,3个分支粗细大致相同呈"凸透镜"样.(3)1例合并基底动脉成窗,1例合并大脑后动脉成窗,1例合并永久三叉动脉,3例合并颅内其他动脉的动脉瘤.结论 CTA能快速、直观、准确地判断大脑中动脉成窗及其合并症,熟悉其CTA特征有助于指导临床制定合理的治疗方案,提高相应治疗中的安全性.%Objective To analyze the incidence and CT angiography(CTA) features of the fenestrations variation of middie eerebral artery, and to improve dignesis. Materials and Methods The imaging data of 2734 patients peeformed 64 slice CTA of the cranio cervical arteries in our hospital between November,2007 and January 2010 were evaluated retrospectively,and 14 of them were diagnosed as the fenestration variation of middle cerebral arteries. The incidence,location,morpholngical characteristics of the fenestration of middle cerebral artery and its coexisting abnormalities were analyzed. Results ( 1 ) 15 fenestrations variation of middle cerebral arteries in 14 patients were found,withh the incidence of 0.51% ( 14/2734 ). 80%( 12 fenestrations) were located at the proximal Mi segments,13.3% (2 fenestrations) at the distal

  6. Cardiac CT angiography after coronary artery surgery in children using 64-slice CT scan

    Energy Technology Data Exchange (ETDEWEB)

    Marini, Davide; Agnoletti, Gabriella [Centre de Reference Malformations Cardiaques Congenitales Complexes-M3C, Universite Paris Descartes, UFR Necker-Enfants Malades, Paris (France); Brunelle, Francis [University Paris Descartes, UFR Necker-Enfants Malades, Department of Pediatric Radiology, APHP, Paris (France); Sidi, Daniel; Bonnet, Damien [Centre de Reference Malformations Cardiaques Congenitales Complexes-M3C, Universite Paris Descartes, UFR Necker-Enfants Malades, Paris (France); Ou, Phalla [Centre de Reference Malformations Cardiaques Congenitales Complexes-M3C, Universite Paris Descartes, UFR Necker-Enfants Malades, Paris (France); University Paris Descartes, UFR Necker-Enfants Malades, Department of Pediatric Radiology, APHP, Paris (France)], E-mail: phalla.ou@nck.aphp.fr

    2009-09-15

    Objective: The purpose of this study was to compare the diagnostic accuracy of 64-slice CT with that of invasive angiography in the detection of graft and/or coronary angioplasty stenosis in children who had undergone coronary artery surgery. Population and methods: Fifteen consecutive children (8 male and 7 female; age 9.2 {+-} 6.1 years) underwent 64-slice CT because of chest pain or ECG changes mean 4.8 {+-} 3.7 years after surgical coronary artery surgery; 10 patients had coronary angioplasty using a patch from the saphenous vein, four had mammary artery bypass, and one had saphenous vein bypass. Six main segments of the coronary arteries and all the bypass graft considered as a single segment were analyzed and compared with invasive angiography used as the reference standard. Results: CT correctly identified the four children with coronary angioplasty and mammary graft lesions that were confirmed by conventional angiography: one patient had a significant stenosis (>50% stenosis) at the mammary bypass graft anastomosis site; three other had non-significant stenosis (<50% stenosis) including a mild lesion of the saphenous vein patch in two patients and a mild lesion at the anastomosis site of the mammary bypass in one. All segments identified as normal by CT in the other 11 children were also found to be normal by conventional angiography. Conclusion: In centers expert in this technique, 64-slice CT scanning is a promising, rapid, and useful diagnostic technique for evaluating both coronary angioplasty and bypass graft lesions in children who had undergone coronary artery surge0008.

  7. 64层螺旋CT评价膝关节创伤后的隐匿病变及软组织损伤%Evaluation of the occult lesions and soft tissue injury after knee injury by 64-slice spiral CT

    Institute of Scientific and Technical Information of China (English)

    钟俊; 杨法宝; 赵学航; 张丽; 李勤祥

    2012-01-01

    背景:膝关节创伤患者在行X射线检查后进一步选择64层螺旋CT检查时,根据伤情及重建需要选择何种后处理技术在临床上存在一定分歧.目的:探讨64层螺旋CT及后处理技术在膝关节创伤中的应用价值.方法:回顾性分析79例膝关节创伤患者的普通X射线片及64排螺旋CT影像学资料,采用多平面重组、容积显示和表面遮盖显示等后处理技术,结合原始骨窗及软组织窗图像,由2名以上有经验的放射科和骨科医生对图像进行双盲分析并与临床及图像重建结果对照.结果与结论:在79例膝关节创伤患者中,共计92处骨折.普通X射线片诊断68例82处骨折,1例假阳性,5例假阴性,检出率约为89%;经64层螺旋CT及三维重建后确诊79例共92处骨折,检出率100%.证实,和X射线检查相比,64层螺旋CT及多种图像重建是膝关节创伤的重要辅助检查手段,能进一步明确有无膝关节周围隐匿性骨折、微骨折及脱位及软组织损伤等.%BACKGROUND: The patients with knee trauma received the 64-slice spiral CT examination after the X-ray examination, and there still some differences on the choice of the post-processing technology in clinic according to the injury and reconstruction needs. OBJECTIVE: To investigate application value of 64-slice spiral CT and the post-processing technology in the knee injury. METHODS: The imaging data of the X-ray and 64-slice spiral CTofthe 79 patients with knee injury were retrospectively analyzed, the post-processing technology, such as the multiple planar reformation, volume rendering and shaded surface display were adopted and combined with the image of the original bone and soft tissue window, and the images were dealt by two or more experienced X-ray and orthopaedic surgeons with double-blind analysis and compared with the clinical and operation results . RESULTS AND CONCLUSION: In all the 79 patients with knee injury, there were a total of 92 fractures

  8. 低仟伏64层MSCT扫描对泌尿系结石检出的研究%Low kilovotage 64-slice spiral CT in the detection of urinary calculus:an experimental study

    Institute of Scientific and Technical Information of China (English)

    王秋霞; 陈亮; 黄文华; 胡道予

    2011-01-01

    目的:探讨低仟伏值(kV)低辐射量MSCT扫描对泌尿系结石的检出率及对图像质量的影响.方法:将4种单一成分的泌尿系结石108粒放入猪里脊肉内制成结石模型,应用64层螺旋CT对模型进行扫描,扫描的管电压分别为120 kV、100 kV和80 kV,并与不同的管电流进行组合,层厚为5 mm,层间距为5 mm,螺距为0.984.扫描后的原始数据(5mm层厚)重建成1.25mm层厚,使用GE ADW4.3工作站对数据进行处理.测量图像质量的噪声水平,记录X线辐射剂量指标CTDIvol.结果:与对照组120kV-250mAs相比,实验组80kV-150mAs及100kV-50mAs组的噪声SD值仅分别升高7.60%和8.62%,主观评分均为合格,结石检出率为100%,而辐射剂量降低率分别达到81.40%和87.60%.结论:合适的低kV-mAs组合对泌尿系结石的检出率可以达到100%,且明显降低辐射剂量.%Objective : To investigate the detectability of urinary calculi undergoing 64-slice CT scanning with reducing kV and to evaluate the image quality,so as to obtain the optimal scanning program. Methods : The calculi model was made by inserting 108 granules of urinary calculus containing four kinds of simple constituent into pork loin,and then scanned by 64-slice CT. The scanning parameters were as follows : three different dose-groups were chosen according to the fixed kV set 120kV, 100kV , 80kV : slice thickness and interval 5mm ; the pitch is 0.984; the raw data were reconstructed into 1.25mm ; all the reconstructed images were transferred to GE ADW4.3 workstation. To evaluate image quality according to different dose-groups and counted the number of detected calculus respectively. The standard deviation (SD) and signal to noise ratio (SNR) of the images were measured. CT dose index volume (CTDIvol) was obtained automatically. Results: 120kV~250mAs was set to be the control group. Compared with the control group,80kV-150mAs,100kV~50mAs and 120kV~30mAs noise SD values were only increased by 7.60 %,8

  9. Assessments of Coronary Artery Visibility and Radiation Dose in Infants with Congenital Heart Disease on Cardiac 128-slice CT and on Cardiac 64-slice CT.

    Science.gov (United States)

    Cui, Y; Huang, M; Zheng, J; Li, J; Liu, H; Liang, C

    2016-01-01

    The aim of this study was to compare the coronary artery visibility and radiation dose in infants with CHD on cardiac 128-slice CT and on cardiac 64-slice CT. The images of 200 patients were analyzed in this study, 100 patients were selected randomly from a group of 789 infants (ECG-triggered axial scan, and 100 were selected randomly from 911 infants with CHD undergoing 64-slice CT retrospective ECG-gated spiral scan. The visibility of coronary artery segments was graded on a four-point scale. The coronary arteries were considered to be detected or visible when grade was 2 or higher. The visibility of the coronary artery segments and the radiation dose was compared between the two groups. Except for the rate of LM (96 vs. 99%), the detection rates of the total, LAD, LCX, RCA, and the proximal segment of the RCA in the 256-slice CT group were significantly higher than those in the 64-slice CT group (51.7, 53.33, 33.67, 53.33, and 99 vs. 34.8, 34.33, 18, 30.67, and 75%, respectively). The counts of visibility score (4/3/2/1) for the LM and the proximal segment of the RCA were 62/22/12/4 and 56/20/17/7, respectively, in the 128-slice CT group and 17/42/30/1 and 9/30/38/25, respectively, in the 64-slice CT group. There were significant differences, especially for score 4 and 3, between the two groups. The radiation dose in the 128-slice CT group was significantly decreased than those in the 64-slice CT group (CTDIvol 1.88 ± 0.51 vs. 5.61 ± 0.63 mGy; SSDE 4.48 ± 1.15 vs. 13.97 ± 1.52 mGy; effective radiation dose 1.36 ± 0.44 vs. 4.06 ± 0.7 mSv). With reduced radiation dose, the visibility of the coronary artery in infants with CHD via prospective ECG-triggered mode on a 128-slice CT is superior to that of the 64-slice CT using retrospective ECG-gated spiral mode. PMID:26271472

  10. 64层螺旋CT冠状动脉成像筛查中老年人冠状动脉粥样硬化的价值%Value of 64-slice spiral CT coronary artery imaging to screening examination of coronary atherosclerosis in middle-aged and senile patients

    Institute of Scientific and Technical Information of China (English)

    徐元昌; 周维彬; 唐娟; 邓娟

    2015-01-01

    Objective To analyze the incidence rate of coronary atherosclerosis (CA) in middle-aged and senile people and the relation between high-risk factors and CA by means of 64-slice spiral CT coronary artery imaging .Methods Total 2738 middle-aged and senile people without history of coronary heart disease ( CHD) were provided with 64-slice spiral CT coronary artery imaging examination, and the results were analyzed statistically .Results Among the 2738 people, 2512 vessels with CA in 735 patients were found;the incidence rate became higher with the increase of age and it was also higher in the patients smoking and drinking for a long time and those with hypertension and high blood fat .Conclusion 64-slice spiral CT coronary artery imaging has important value to early diagnosis and treatment of CA in middle-aged and senile people .%目的:通过64层螺旋CT冠状动脉成像检查,分析冠状动脉粥样硬化在中老年人群的发病率及高危因子与冠状动脉粥样硬化的相关性。方法对2738例无冠心病病史的中老年人进行64层螺旋CT冠状动脉成像检查,对检查结果进行统计学分析。结果2738例中,共发现冠状动脉粥样硬化735例2512支血管;随着年龄增加发病率增高,长期吸烟、嗜酒、高血压、高血脂者冠状动脉粥样硬化发病率高。结论对中老年人群开展64层螺旋CT冠状动脉成像检查,对冠状动脉粥样硬化的早诊断、早治疗有着重要的价值。

  11. The Analysis of Blood Flow Dynamics About 64-slice Spiral CT Perfusion Imaging for Primary Liver Cancer%原发性肝癌患者64层螺旋CT灌注成像血流动力学分析

    Institute of Scientific and Technical Information of China (English)

    孙建华

    2015-01-01

    目的:探讨原发性肝癌患者64层螺旋CT灌注成像血流动力学的表现。方法收集2012年8月~2013年7月来我院就诊的确诊为原发性肝癌的患者46例并将其作为观察组,选取2012年8月~2013年7月来我院进行健康体检的健康对象46例并将其作为对照组,血液流动力学表现采用64层螺旋CT灌注成像观察,检测并比较两组患者肝动脉灌注量、肝门静脉灌注量、总肝灌注量、肝动脉灌注指数。结果观察组肝动脉灌注量、肝动脉灌注指数高于对照组,肝门静脉灌注量、总肝灌注量低于对照组,两组差异有统计学意义(P<0.05)。结论原发性肝癌患者采用64层螺旋CT灌注成像诊断血液流动力学表现较为显著,具有较高的诊断价值。%Objective To Einvestigate the blood flow dynamics about 64-slice spiral CT perfusion imaging for primary liver cancer. Methods 46 patients with primary liver cancer diagnosed in our hospital were collected from August 2012 to July 2013 and taken as the observation group, 46 cases of health object for physical examination in our hospital were selected at the same time as the control group, observed the blood lfow dynamics performance used by 64-slice spiral CT perfusion imaging, the two groups were measured and compared about hepatic arterial perfusion, hepatic portal vein perfusion, total liver perfusion, hepatic perfusion index. Results Hepatic arterial perfusion, hepatic perfusion index of observation group were higher, the hepatic portal vein perfusion, total hepatic perfusion were lower than the control group, the difference was statistically significant (P<0.05). Conclusions Primary liver cancer patients use 64-slice spiral CT perfusion imaging in the diagnosis of blood lfow dynamics performance is more signiifcant, with high diagnostic value.

  12. Radiation dose and cancer risk from pediatric CT examinations on 64-slice CT: A phantom study

    Energy Technology Data Exchange (ETDEWEB)

    Feng Shiting [Department of Radiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou (China); Law, Martin Wai-Ming [Department of Clinical Oncology, Queen Mary Hospital (Hong Kong); Huang Bingsheng [Department of Diagnostic Radiology, University of Hong Kong (Hong Kong); Ng, Sherry [Department of Clinical Oncology, Queen Mary Hospital (Hong Kong); Li Ziping; Meng Quanfei [Department of Radiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou (China); Khong, Pek-Lan, E-mail: plkhong@hkucc.hku.hk [Department of Diagnostic Radiology, University of Hong Kong (Hong Kong)

    2010-11-15

    Objective: To measure the radiation dose from CT scans in an anthropomorphic phantom using a 64-slice MDCT, and to estimate the associated cancer risk. Materials and methods: Organ doses were measured with a 5-year-old phantom and thermoluminescent dosimeters. Four protocols; head CT, thorax CT, abdomen CT and pelvis CT were studied. Cancer risks, in the form of lifetime attributable risk (LAR) of cancer incidence, were estimated by linear extrapolation using the organ radiation doses and the LAR data. Results: The effective doses for head, thorax, abdomen and pelvis CT, were 0.7 mSv, 3.5 mSv, 3.0 mSv, 1.3 mSv respectively. The organs with the highest dose were; for head CT, salivary gland (22.33 mGy); for thorax CT, breast (7.89 mGy); for abdomen CT, colon (6.62 mGy); for pelvis CT, bladder (4.28 mGy). The corresponding LARs for boys and girls were 0.015-0.053% and 0.034-0.155% respectively. The organs with highest LARs were; for head CT, thyroid gland (0.003% for boys, 0.015% for girls); for thorax CT, lung for boys (0.014%) and breast for girls (0.069%); for abdomen CT, colon for boys (0.017%) and lung for girls (0.016%); for pelvis CT, bladder for both boys and girls (0.008%). Conclusion: The effective doses from these common pediatric CT examinations ranged from 0.7 mSv to 3.5 mSv and the associated lifetime cancer risks were found to be up to 0.16%, with some organs of higher radiosensitivity including breast, thyroid gland, colon and lungs.

  13. Coronary artery imaging during preoperative CT staging: preliminary experience with 64-slice multidetector CT in 99 consecutive patients

    Energy Technology Data Exchange (ETDEWEB)

    Delhaye, Damien; Remy-Jardin, Martine; Rozel, Celine; Remy, Jacques [University Center of Lille, Boulevard Jules Leclerc, Department of Thoracic Imaging, Hospital Calmette, Lille cedex (France); Dusson, Catherine; Wurtz, Alain [University Center of Lille, Department of Thoracic Surgery, Hospital Calmette, Lille cedex (France); Delannoy-Deken, Valerie; Duhamel, Alain [University of Lille, Department of Medical Statistics, Lille cedex (France)

    2007-03-15

    The purpose of this study was to evaluate the clinical feasibility of coronary artery imaging during routine preoperative 64-slice MDCT scans of the chest. Ninety-nine consecutive patients in sinus rhythm underwent a biphasic multidetector-row spiral CT examination of the chest without the administration of beta-blockers, including an ECG-gated acquisition over the cardiac cavities, followed by a non-gated examination of the upper third of the thorax. Data were reconstructed to evaluate coronary arteries and to obtain presurgical staging of the underlying disease. The percentage of assessable segments ranged from 65.4% (972/1,485) when considering all coronary artery segments to 88% (613/693) for the proximal and mid segments, reaching 98% (387/396) for proximal coronary artery segments. The 387 interpretable proximal segments included 97 (97%) LM, 99 (100%) LAD, 96 (97%) LCX and 95 (96%) RCA with a mean attenuation of 280.70{+-}52.93 HU. The mean percentage of assessable segments was significantly higher in patients with a heart rate {<=}80 bpm (n=48) than in patients with a heart rate greater than 80 bpm (n=35) (80{+-}11% vs. 72{+-}13%; P=0.0008). Diagnostic image quality was achieved in all patients for preoperative staging of the underlying disorder. The mean estimated effective dose was 12.06{+-}3.25 mSv for ECG-gated scans and 13.88{+-}3.49 mSv for complete chest examinations. Proximal and mid-coronary artery segments can be adequately evaluated during presurgical CT examinations of the chest obtained with 64-slice MDCT without the administration of {beta}-blockers. (orig.)

  14. Coronary ostial involvement in acute aortic dissection: detection with 64-slice cardiac CT.

    LENUS (Irish Health Repository)

    Ryan, E Ronan

    2012-02-01

    A 41-year-old man collapsed after lifting weights at a gym. Following admission to the emergency department, a 64-slice cardiac computed tomography (CT) revealed a Stanford Type A aortic dissection arising from a previous coarctation repair. Multiphasic reconstructions demonstrated an unstable, highly mobile aortic dissection flap that extended proximally to involve the right coronary artery ostium. Our case is an example of the application of electrocardiogram-gated cardiac CT in directly visualizing involvement of the coronary ostia in acute aortic dissection, which may influence surgical management.

  15. Adolescent Kawasaki disease: usefulness of 64-slice CT coronary angiography for follow-up investigation

    Energy Technology Data Exchange (ETDEWEB)

    Carbone, Iacopo; Cannata, David; Algeri, Emanuela; Galea, Nicola; Napoli, Alessandro; Catalano, Carlo; Passariello, Roberto; Francone, Marco [Sapienza University of Rome, Department of Radiological, Onchological and Anatomopathological Sciences, Policlinico Umberto I, Rome (Italy); De Zorzi, Andrea [Bambino Gesu Hospital, Cardiology Division, Rome (Italy); Bosco, Giovanna; D' Agostino, Rita [Sapienza University of Rome, Unit of Paediatric Cardiology, Policlinico Umberto I, Rome (Italy); Menezes, Leon [University College of London, Institute of Nuclear Medicine, London (United Kingdom)

    2011-09-15

    Kawasaki disease (KD) is a systemic vasculitis that mainly affects coronary arteries in children, and requires regular follow-up from the time of diagnosis. To evaluate the feasibility of 64-slice CT angiography (CTA) for follow-up of patients with KD using previously performed invasive catheter coronary angiography (CCA) as reference standard. The study group comprised 12 patients (age 17.6 {+-} 2.9 years, mean{+-}SD) with a diagnosis of KD and a previously performed CCA (interval, 32.6 {+-} 13.5 months) who underwent 64-slice cardiac CTA. The quality of the images for establishing the presence of coronary abnormalities was determined by two observers. The CTA findings were compared with those from the prior CCA. Adequate image quality was obtained in all patients. Mean effective dose for CTA was 6.56 {+-} 0.95 mSv. CTA allowed accurate identification, characterization and measurement of all coronary aneurysms (n = 32), stenoses (n = 3) and occlusions (n = 9) previously demonstrated by CCA. One patient with disease progression went on to have percutaneous coronary intervention. Coronary lesions were reliably evaluated by 64-slice CTA in the follow-up of compliant patients with KD, reducing the need for repeated diagnostic invasive CCA. Hence, in an adequately selected patient population, the role of CCA could be limited almost only to therapeutic procedures. (orig.)

  16. Diagnostic value of 64-slice CT angiography in coronary artery disease: A systematic review

    International Nuclear Information System (INIS)

    Purpose: To perform a systematic review of the diagnostic value of 64-multislice CT (MSCT) angiography in the detection of coronary artery disease (CAD) when compared to conventional coronary angiography. Materials and methods: A search of PUBMED and MEDLINE databases for English literature was performed. Only studies with at least 10 patients comparing 64-slice MSCT angiography with conventional coronary angiography in the detection of CAD were included. Diagnostic value of MSCT angiography compared to coronary angiography was compared and analysed at segment-, vessel- and patient-based assessment. Results: Fifteen studies met selection criteria and were included for analysis. Pooled sensitivity, specificity, positive predictive value and negative predictive value as well as 95% confidence interval (CI) were 97% (94 and 99%), 88% (79 and 97%), 94% (91 and 97%), and 95% (90 and 99%) for patient-based assessment; 92% (85 and 99%), 92% (85 and 99%), 78% (66 and 91%) and 98% (96 and 99%) for vessel-based assessment; 90% (85 and 94%), 96% (95 and 97%), 75%(68 and 82%) and 98% (98 and 99%) for segment-based assessment, respectively. No significant difference was found in the diagnostic accuracy of 64-slice CT in the detection of CAD when comparison was performed either among four main coronary arteries, or between proximal and middle or distal segments (p > 0.05). Conclusion: Our results showed that 64-slice CT angiography has a high-diagnostic value in the detection of CAD. Severe coronary artery calcification seems to be the major factor affecting the visualisation and assessment

  17. Detection of Postcoronary Stent Complication: Utility of 64-Slice Multidetector CT

    Directory of Open Access Journals (Sweden)

    Alpa Bharati

    2012-01-01

    Full Text Available Coronary stent fracture is a known complication of coronary arterial stent placements. Multiple long-term risks are also associated with drug eluting stents. 64-slice multidetector CT (MDCT coronary angiography has been shown to detect poststent complications such as instent stenosis, thrombosis, stent migration and stent fractures. We report a case of stent fracture in a patient who underwent RCA stenting with associated RCA perforation and almost complete thrombosis of the RCA and peristent fibrinoid collection. This is a rare case of stent fracture with perforation of the RCA. The paper highlights the role of 64-row multidetector computed tomography (MDCT in evaluation of such poststent placement complications.

  18. Influence of intra-coronary enhancement on diagnostic accuracy with 64-slice CT coronary angiography

    Energy Technology Data Exchange (ETDEWEB)

    Cademartiri, Filippo [Azienda Ospedaliero-Universitaria di Parma, Department of Radiology and Cardiology, Parma (Italy); Erasmus Medical Center, Department of Radiology and Cardiology, Rotterdam (Netherlands); Azienda Ospedaliero-Universitaria di Parma, Non-invasive Cardiovascular Imaging Unit, Department of Radiology, Parma (Italy); Maffei, Erica; Aldrovandi, Annachiara; Fusaro, Michele; Vignali, Luigi; Menozzi, Alberto [Azienda Ospedaliero-Universitaria di Parma, Department of Radiology and Cardiology, Parma (Italy); Palumbo, Anselmo A. [Azienda Ospedaliero-Universitaria di Parma, Department of Radiology and Cardiology, Parma (Italy); Erasmus Medical Center, Department of Radiology and Cardiology, Rotterdam (Netherlands); Malago, Roberto [University of Verona, Department of Radiology, Verona (Italy); La Grutta, Ludovico; Midiri, Massimo [University of Palermo, Department of Radiology, Palermo (Italy); Meiijboom, W.B.; Mollet, Nico R.A.; Krestin, Gabriel P. [Erasmus Medical Center, Department of Radiology and Cardiology, Rotterdam (Netherlands); Brambilla, Valerio; Coruzzi, Paolo [Don Gnocchi ONLUS, Cardiovascular Rehabilitation Unit, Parma (Italy); Kirchin, Miles A. [Bracco Imaging SpA, Worldwide Medical and Regulatory Affairs, Milan (Italy)

    2008-03-15

    We assessed the effect of intra-coronary attenuation on diagnostic accuracy using 64-slice computed tomography coronary angiography (CT-CA). We enrolled 170 patients with suspected coronary artery disease who underwent conventional coronary angiography (CA) and 64-slice CT-CA (100 ml of Iomeprol 400 mg I/ml at 4 ml/s). The study population was divided into two groups (85 patients each based on median attenuation of 326 HU) based on mean arterial attenuation; group 1 with low attenuation and group 2 with high attenuation. Diagnostic accuracy for the detection of significant coronary artery stenosis was determined for both groups using CA as reference standard. Overall, 163 significant stenoses were detected in 1,030 assessable coronary artery segments in group 1 compared with 160 significant stenoses in 1,020 assessable segments in group 2. The average intra-coronary attenuation was significantly (P < 0.05) higher for group 2 (388 {+-} 46 HU) compared with group 1 (291 {+-} 33 HU). The corresponding sensitivity and specificity values for detection of significant coronary artery stenosis were higher for group 2 (96.3% and 97.6%, respectively) than for group 1 (82.8% and 93.2%, respectively) and were more marked in distal coronary segments than in proximal segments. Higher intra-coronary attenuation on CT-CA results in greater diagnostic accuracy for detection of coronary artery stenosis. (orig.)

  19. Assessments of Coronary Artery Visibility and Radiation Dose in Infants with Congenital Heart Disease on Cardiac 128-slice CT and on Cardiac 64-slice CT.

    Science.gov (United States)

    Cui, Y; Huang, M; Zheng, J; Li, J; Liu, H; Liang, C

    2016-01-01

    The aim of this study was to compare the coronary artery visibility and radiation dose in infants with CHD on cardiac 128-slice CT and on cardiac 64-slice CT. The images of 200 patients were analyzed in this study, 100 patients were selected randomly from a group of 789 infants (coronary artery segments was graded on a four-point scale. The coronary arteries were considered to be detected or visible when grade was 2 or higher. The visibility of the coronary artery segments and the radiation dose was compared between the two groups. Except for the rate of LM (96 vs. 99%), the detection rates of the total, LAD, LCX, RCA, and the proximal segment of the RCA in the 256-slice CT group were significantly higher than those in the 64-slice CT group (51.7, 53.33, 33.67, 53.33, and 99 vs. 34.8, 34.33, 18, 30.67, and 75%, respectively). The counts of visibility score (4/3/2/1) for the LM and the proximal segment of the RCA were 62/22/12/4 and 56/20/17/7, respectively, in the 128-slice CT group and 17/42/30/1 and 9/30/38/25, respectively, in the 64-slice CT group. There were significant differences, especially for score 4 and 3, between the two groups. The radiation dose in the 128-slice CT group was significantly decreased than those in the 64-slice CT group (CTDIvol 1.88 ± 0.51 vs. 5.61 ± 0.63 mGy; SSDE 4.48 ± 1.15 vs. 13.97 ± 1.52 mGy; effective radiation dose 1.36 ± 0.44 vs. 4.06 ± 0.7 mSv). With reduced radiation dose, the visibility of the coronary artery in infants with CHD via prospective ECG-triggered mode on a 128-slice CT is superior to that of the 64-slice CT using retrospective ECG-gated spiral mode.

  20. Value of 64-slice spiral CT perfusion imaging in estimating the efficacy of transcatheter arterial chemoembolization for the treatment of hepatocellular carcinoma%64排螺旋CT灌注成像在肝细胞癌介入治疗前后的评估价值

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    Objective To discuss the clinical value of 64-slice spiral CT perfusion imaging(CTPI) in estimating the efficacy of transcatheter arterial chemoembolization ( TACE ) for hepatocellular carcinoma (HCC).Methods Using 64-slice spiral CT(GE LightSpeed VCT XT),all CT plain scan and perfusion scan were performed in 30 patients with HCC 1-3 days before and 30-40 days after TACE .Using deconvolution through Infusion Software analysis , hepatic blood flow ( BF ) , blood volume ( BV ) , the mean transit time ( MTT) , hepatic arterial fraction ( HAF ) , permeability surface ( PS ) were caculated to evaluate HCC embolization hemodynamic status .Results After TACE,the tumor was totally filled with lipiodol in 12 cases and partially filled with lipiodol in 18 cases.BF,BV,MTT,HAF and PS perfusion maps showed that lack of blood perfusion was found in lipiodol-filling areas, but sparsely or insufficiently lipiodol-filled areas were hyperperfusion.BF,BV,HAF and PS of HCC after TACE were lower than those of HCC before TACE (P0.05 ) .Conclusions 64-slice spiral CT liver perfusion imaging can be used to monitor the blood supply changes in non -iodized oil deposits area non-invasively ,dynamically ,quantitatively ,which was very important in judging the tumor tissue survival and played an important role in response evaluation of HCC interventional therapy and guiding the follow -up treatment.%目的:探讨64排螺旋CT灌注成像(CTPI)在原发性肝细胞癌(HCC)肝动脉插管化疗栓塞( TACE )术前、后疗效的评估价值。方法选取30例HCC 患者,于TACE术前1~3 d、术后30~40 d应用GE LightSpeed VCT XT(64排128层螺旋CT)分别行全肝常规平扫及灌注扫描,运用灌注软件进行分析,计算肝血流量(BF)、血容量(BV)、平均通过时间(MTT)、肝动脉灌注指数(HAF)、毛细血管通透性( PS )等,统计分析相关参数,以评价 HCC 介入治疗前后的血流动力学状态。结果 TACE

  1. 64-slice multidetector coronary CT angiography: in vitro evaluation of 68 different stents

    Energy Technology Data Exchange (ETDEWEB)

    Maintz, David; Seifarth, Harald; Rink, Michael; Oezguen, Murat; Heindel, Walter; Fischbach, Roman [University of Muenster, Department of Clinical Radiology, Muenster (Germany); Raupach, Rainer; Flohr, Thomas [Siemens Medical Solutions, Forchheim (Germany); Sommer, Torsten [University of Bonn, Department of Radiology, Bonn (Germany)

    2006-04-15

    The purpose of this study was to test a large sample of different coronary artery stents using four image reconstruction approaches with respect to lumen visualization, lumen attenuation, and image noise in 64-slice multidetector-row computed tomography (MDCT) in vitro and to provide a catalogue of currently used coronary artery stents when imaged with state-of the-art MDCT. We examined 68 different coronary artery stents (57 stainless steel, four cobalt-chromium, one cobalt-alloy, two nitinol, four tantalum) in a coronary artery phantom (vessel diameter 3 mm, intravascular attenuation 250 HU, extravascular density -70). Stents were imaged in axial orientation with standard parameters: 32x0.6 collimation, pitch 0.24, 680 mAs, 120 kV, rotation time 0.37 s. Four different image reconstructions were obtained with varying convolution kernels and section thicknesses: (1) soft, 0.6 mm, (2) soft, 0.75, (3) medium soft, 0.6, and (4) stent-optimized sharp, 0.6. To evaluate visualization characteristics of of the stent, the lumen diameter, intraluminal density and noise were measured. The high-resolution kernel offered significantly better average lumen visualization (57% {+-}10%) and more realistic lumen attenuation (222 HU {+-}66 HU) at the expense of increased noise (15.3 HU {+-}3.7 HU) compared with the soft and medium-soft CT angiography (CTA) protocol (p<0.001 for all). Stents with a lumen visibility of more than 66% were: Arthos pico, Driver, Flex, Nexus2, S7, Tenax complete, Vision (all 67%), Symbiot, Teneo (70%), and Radius (73%). Only ten stents showed a lumen visibility of less than 50%. Stent lumen visibility largely varies depending on the stent type. Even with the improved spatial resolution of 64-slice CT, a stent-optimized kernel remains beneficial for stent visualization when compared with the standard medium-soft CTA protocol. Using 64-slice CT and high-resolution kernel, the majority of stent products show a lumen visibility of more than 50% of the stent

  2. In vitro imaging of coronary artery stents: Are there differences between 16- and 64-slice CT scanners?

    International Nuclear Information System (INIS)

    Purpose: To compare the performance of 64-slice with 16-slice CT scanners for the in vitro evaluation of coronary artery stents. Methods and materials: Twelve different coronary artery stents were placed in the drillings of a combined heart and chest phantom, which was scanned with a 16- and 64-slice CT scanner. Coronal reformations were evaluated for artificial lumen narrowing, intraluminal attenuation values, and false widening of the outer stent diameter as an indicator of artifacts outside the stent. Results: Mean artificial lumen narrowing was not significantly different between the 16- and 64-slice CT scanner (44% versus 39%; p = 0.408). The differences between the Hounsfield Units (HU) measurements inside and outside the stents were significantly lower (p = 0.001) with 64- compared to 16-slice CT. The standard deviation of the HU measurements inside the stents was significantly (p = 0.002) lower with 64- than with 16-slice CT. Artifacts outside the stents were not significantly different between the scanners (p = 0.866). Conclusion: Visualization of the in-stent lumen is improved with 64-slice CT when compared with 16-slice CT as quantified by significantly lesser intraluminal image noise and less artificial rise in intraluminal HU measurement, which is the most important parameter for the evaluation of stent patency in vivo

  3. 64排螺旋CT功能成像技术在兔急性肾损伤诊断中的价值%Value of 64-slice spiral CT functional imaging techniques for diagnosis of acute kidney injury in rabbits

    Institute of Scientific and Technical Information of China (English)

    赵效新; 王新宇; 王文红; 李亚军; 孙浩然; 孟祥鹿; 顾程

    2016-01-01

    Objective To quantitatively assess renal hemodynamic changes in hypertensive acute kidney injury in rabbits induced by L-NAME using 64-slice spiral CT functional imaging techniques,and to explore the application of these techniques in evaluation of early kidney functional changes.Methods Fourteen female New Zealand white rabbits were randomly divided into normal control group (n=6)and L-NAME group (n=8).The control group was injected NaCl solution and the L-NAME group was injected the same amount of L-NAME solution to make hypertensive acute kidney injury model.64-slice spiral CT and SPECT were scanned af-ter injection.Blood samples were collected before and after injecting NaCl and L-NAME solution to detect serum creatinine (Cr).Cr level and CT perfusion parameters of the two groups were analyzed and compared with the pathology results.GFRCT detected by con-trast-enhanced CT and GFRSPECT detected by SPECT were analyzed by the rank correlation test.Results Renal blood volume,blood flow,permeability surface,time to peak,and peak value had statistically significant differences between the control and L-NAME group (P <0.05).GFRCT and GFRSPECT had obvious correlation.GFRCT of L-NAME group was obviously lower than that of the con-trol group.The kidneys of L-NAME group showed obviously injured under both light microscope and microscope.Conclusion 64-slice spiral CT functional imaging techniques can dynamically observe and quantitatively assess early hypertensive kidney dysfunc-tion,especially unilateral renal blood flow abnormalities.It is an effective examination in quantitatively assessing kidney function.%目的:利用64排螺旋 CT 功能成像技术定量分析 N-硝基-L-精氨酸甲酯(L-NAME)致兔高血压急性肾损伤后肾血流动力学变化,探讨该技术在评估早期肾功能损伤中的应用价值。方法将14只雌性新西兰大白兔随机分成正常对照组(n=6)和 L-NAME 组(n=8)。对照组注入氯化钠(NaCl)溶液,L-NAME

  4. Assessment of the right ventricular function in patients with chronic obstructive pulmonary disease and cor pulmonale using cardiac 64-slice spiral CT comparing with 1.7 T MRI

    International Nuclear Information System (INIS)

    cardiac CT were correlated well with that on cardiac MRI. The MM of the RV showed moderate correlation (r=0.82), RV volumes and RVEF significant correlation (r=0.98 and 0.97 for RV EDV and RV ESV, r=0.95 for RVEF, respectively). A strong correlation between MSCT and MRI for the assessment of RV function was also found using Bland-Altman plot. The correlation was excellent between the MSCT results and forced expiratory volume in 1 sec (r=0.781 for RVEF, r=-0.824 for RV MM) in COPD patients. Conclusions: Cardiac MSCT can accurately assess the RV size and function in comparison to MRL Patients with severe COPD have RV dysfunction. (authors)

  5. Tracheobronchial tumor:evaluation by using 64-slice spiral CT with multiplanar and three-dimensional reconstructions%64层螺旋CT三维重建在气管主支气管肿瘤诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    张蕴; 荐志洁; 赵婷婷; 石志红; 朱柏

    2012-01-01

    Objective To evaluate the roles of 64-slice spiral CT with multiplanar and three-dimensional reconstructions in the di-agnosis of tracheobronchial tumor. Methods 39 cases were undergone CT scan for chest using TOSHIBA Aquilion 64 or PHILIPS Brilliance 64 system. The post-processing techniques included volume rendering (VR), virtual bronchoscopy( VB) , multiplanar re-construction (MPR) , minimum intensity projection(MinIP) in Vitrea 2 workstation. The CT manifestations were analyzed, and compared with the results of the operation and bronchoscopy. Results The tumor located in trachea in 9 cases, right main bronchus in 15 cases, left main bronchus in 13 cases. The tumors were in large airway widely in 2 cases. All of cases showed the filling defect in airway. The degree of lumen stenosis was the first grade in 1 case, the second grade in 0 case, the third grade in 14 cases, the forth grade in 24 cases. The thickening of the walls of the trachea or bronchus in 14 cases, both thickening of the walls and extralu-minal extensions in 23 cases, there was not any thickening of the walls in 2 cases. The edge of the tumor showed smooth in 2 cases, irregular in 37 cases. Benign tumor was in 3 cases, including benign mesenchymoma, leiomyoma, and pleomorphic adenoma in 1 case,respectively. Malignant tumor was in 36 cases, including small cell carcinoma in 8 cases, adenocarcinoma in 1 case, squamous cell carcinoma in 25 cases, mucoepidermoid carcinoma in 1 case, papillary thyroid cancer in 1 case. The diagnostic accuracy was 97. 44% using of 64-slice spiral CT with multiplanar and three-dimensional reconstructions. Conclusion 64-slice spiral CT with multiplanar and three-dimensional reconstructions is a valuable method in the diagnosis and the differential diagnosis of the tracheobronchial benign and malignant tumors, stent planning and follow-up.%目的 探讨64层螺旋CT三维重建在气管、主支气管肿瘤诊断中的应用价值.方法 39例均接受64层螺旋CT胸部

  6. Accessory left atrial diverticulae: contractile properties depicted with 64-slice cine-cardiac CT.

    LENUS (Irish Health Repository)

    Killeen, Ronan P

    2012-02-01

    To assess the contractility of accessory left atrial appendages (LAAs) using multiphasic cardiac CT. We retrospectively analyzed the presence, location, size and contractile properties of accessory LAAs using multiphasic cardiac 64-slice CT in 102 consecutive patients (63 males, 39 females, mean age 57). Multiplanar reformats were used to create image planes in axial oblique, sagittal oblique and coronal oblique planes. For all appendages with an orifice diameter >or= 10 mm, axial and sagittal diameters and appendage volumes were recorded in atrial diastole and systole. Regression analysis was performed to assess which imaging appearances best predicted accessory appendage contractility. Twenty-three (23%) patients demonstrated an accessory LAA, all identified along the anterior LA wall. Dimensions for axial oblique (AOD) and sagittal oblique (SOD) diameters and sagittal oblique length (SOL) were 6.3-19, 3.4-20 and 5-21 mm, respectively. All appendages (>or=10 mm) demonstrated significant contraction during atrial systole (greatest diameter reduction was AOD [3.8 mm, 27%]). Significant correlations were noted between AOD-contraction and AOD (R = 0.57, P < 0.05) and SOD-contraction and AOD, SOD and SOL (R = 0.6, P < 0.05). Mean diverticulum volume in atrial diastole was 468.4 +\\/- 493 mm(3) and in systole was 171.2 +\\/- 122 mm(3), indicating a mean change in volume of 297.2 +\\/- 390 mm(3), P < 0.0001. Stepwise multiple regression analysis revealed SOL to be the strongest independent predictor of appendage contractility (R(2) = 0.86, P < 0.0001) followed by SOD (R(2) = 0.91, P < 0.0001). Accessory LAAs show significant contractile properties on cardiac CT. Those accessory LAAs with a large sagittal height or depth should be evaluated for contractile properties, and if present should be examined for ectopic activity during electrophysiological studies.

  7. Advanced NSCLC First Pass Perfusion at 64-slice CT: Reproducibility of Volume-based Quantitative Measurement

    Directory of Open Access Journals (Sweden)

    Jie HU

    2010-05-01

    Full Text Available Background and objective The aim of this study is to explore the reproducibility of volume-based quantitative measurement of non-small cell lung cancer (NSCLC perfusion at 64-slice CT. Methods Fourteen patients with proved advanced NSCLC were enrolled in this dynamic first pass volume-based CT perfusion (CTP study (8×5 mm collimation, and they underwent the second scan within 24 h. According to the longest diameters, those patients were classified to ≤3 cm and >3 cm groups, and each group had 7 patients. Intraclass correlation coefficient (ICC and Bland-Altman statistics were used to evaluate the reproducibility of CTP imaging. Results In both groups of advanced NSCLC, the reproducibility with BF, BV, and PS values were good (ICC >0.75 for all, but mean transit time (MTT values. For advanced NSCLC (≤3 cm, repeatability coefficient (RC values with blood flow (BF, blood volume (BV, MTT and permeability surface area product (PS values were 56%, 45%, 114%, and 78%, respectively, and the 95% change intervals of RC were -39%-53%, -29%-62%, -83%-145%, and -57%-98%, respectively. For advanced NSCLC (>3 cm, those values were 46%, 30%, 59%, and 33%, respectively, and the 95% change intervals of RC were -48%-45%, -33%-26%, -54%-64%, and -18%-48%. Conclusion There is greater reproducibility of tumor size >3 cm than that of ≤3 cm. BF and BV could be addressed for reliable clinical application in antiangiogenesis therapeutic monitoring with advanced NSCLC patients.

  8. Measurement of scattered radiation in a volumetric 64-slice CT scanner using three experimental techniques

    Energy Technology Data Exchange (ETDEWEB)

    Akbarzadeh, A; Ay, M R; Sarkar, S [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Ghadiri, H [Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Zaidi, H [Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva (Switzerland)], E-mail: mohammadreza_ay@tums.ac.ir

    2010-04-21

    Compton scatter poses a significant threat to volumetric x-ray computed tomography, bringing cupping and streak artefacts thus impacting qualitative and quantitative imaging procedures. To perform appropriate scatter compensation, it is necessary to estimate the magnitude and spatial distribution of x-ray scatter. The aim of this study is to compare three experimental methods for measurement of the scattered radiation profile in a 64-slice CT scanner. The explored techniques involve the use of collimator shadow, a single blocker (a lead bar that suppresses the primary radiation) and an array blocker. The latter was recently proposed and validated by our group. The collimator shadow technique was used as reference for comparison since it established itself as the most accurate experimental procedure available today. The mean relative error of measurements in all tube voltages was 3.9 {+-} 5.5% (with a maximum value of 20%) for the single blocker method whereas it was 1.4 {+-} 1.1% (with a maximum value of 5%) for the proposed blocker array method. The calculated scatter-to-primary ratio (SPR) using the blocker array method for the tube voltages of 140 kVp and 80 kVp was 0.148 and 1.034, respectively. For a larger polypropylene phantom, the maximum SPR achieved was 0.803 and 6.458 at 140 kVp and 80 kVp, respectively. Although the three compared methods present a reasonable accuracy for calculation of the scattered profile in the region corresponding to the object, the collimator shadow method is by far the most accurate empirical technique. Nevertheless, the blocker array method is relatively straightforward for scatter estimation providing minor additional radiation exposure to the patient.

  9. Calcium scoring using 64-slice MDCT, dual source CT and EBT : a comparative phantom study

    NARCIS (Netherlands)

    Groen, Jaap M.; Greuter, Marcel J. W.; Vliegenthart, R.; Suess, C.; Schmidt, B.; Zijlstra, F.; Oudkerk, M.

    2008-01-01

    Purpose Assessment of calcium scoring (Ca-scoring) on a 64-slice multi-detector computed tomography (MDCT) scanner, a dual-source computed tomography (DSCT) scanner and an electron beam tomography (EBT) scanner with a moving cardiac phantom as a function of heart rate, slice thickness and calcium de

  10. Optimization of individualized abdominal scan protocol with 64-slice CT scanner

    International Nuclear Information System (INIS)

    Objective: To explore an individualized abdominal scan protocol with a 64-slice CT scanner. Methods: From Sep. 2010 to Nov. 2010, one hundred consecutive patients, who underwent twice non-contrast-enhanced abdominal CT scans within 3 months, were enrolled in this study. For each patient, the tube current of 274 eff. mAs and 207 eff. mAs were applied respectively in the first and second abdominal scan. The imaging qualities of the two scans were evaluated retrospectively by 3 reviewers. All the individual variants,including height, weight, body mass index (BMI), the maximum transverse diameter, the anteroposterior diameter and the average maximum diameter of abdomen were recorded. A five-point scale was used for grading the image noise of eight organs, including abdominal aorta, portal vein, liver, spleen, gallbladder, pancreas, renal cortex and renal medulla. Diagnostic acceptability of CT images at three anatomic levels,including porta hepatis, pancreas and the upper pole of renal, was also evaluated by using a five-point scale. The noise value of abdominal aorta was defined as the standard deviation (SD) of CT values of aorta at the level of porta hepatis. Scatter diagram and Pearson correlation analysis were used for evaluating the linear relationship between the individual variants and the noise value of abdominal aorta, and multivariate linear regression analysis was used for evaluating the relevance between the individual variants and the noise value of aorta. Results: In this patients group, the average height was (164.6 ± 7.5) cm,the average weight was (64.3 ± 11.0) kg, the BMI was (23.7 ±3.3) kg/m2, the maximum transverse diameter of abdomen was (29.8 ± 2.3) cm, the anteroposterior diameter of abdomen was (23.1 ± 2.9) cm, and the average maximum diameter of abdomen was (26.5 ± 2.5) cm. Pearson correlation analysis showed significant positive linear correlation between the noise value of abdominal aorta (1 1.7 ± 3.0) and patients' weight (r=0

  11. 64-Slice CT Angiography in the Detection of Intracranial Aneurysms: Comparison with DSA and Surgical Findings.

    Science.gov (United States)

    Milošević Medenica, S; V Vućković, V; Prstojević, B

    2010-03-01

    The overall results of CT angiography on 64-slice MSCT published in the last five years are very close to results of DSA which is still a gold standard in the diagnosis of intracranial aneurysms. The aim of this study is to contribute to the confidence in reliability of this method and to try to answer the question of whether CTA should be used as the first diagnostic modality in patients with suspect intracranial aneurysms. In the period from October 2008 to August 2009 we diagnosed 118 aneurysms in 73 patients. We included in this study only those patients who underwent either DSA, surgical treatment or both after MSCTA, and the remainder of the above patients were not treated and are followed up, or died before treatment. So our group comprised 47 patients who were divided into two groups. The first group of 22 patients underwent DSA after MSCTA. We found 36 aneurysms in this group. One aneurysm was falsely positive compared to DSA, while 35 were in concordance with DSA. DSA revealed five aneurysms smaller than 4 mm not disclosed by MSCTA. The second group comprised 25 patients who were operated according to MSCTA findings only. There were 33 aneurysms in this group: 25 aneurysms were operated and surgical findings agreed with MSCTA. Eight aneurysms smaller than 4 mm were not operated and we do not have confirmation for them. In all false positive and false negative cases the misdiagnosed aneurysms were in fact 1-1.5 mm outpouchings that were not responsible for SAH. According to the available literature and our results, MSCTA has proved a very reliable method, simple and safe, competent to be used as a diagnostic modality of choice in the patients with SAH or suspect unruptured aneurysm. DSA should be used in cases of negative or uncertain findings on MSCTA, excluding cases of perimesencephalic SAH with negative MSCTA. The relative disadvantage of this method is its lower sensitivity in the detection of tiny outpouchings, especially in the infraclionid region

  12. Comparative evaluation of 64-slice CT angiography and digital subtraction angiography in assessing the cervicocranial vasculature

    Directory of Open Access Journals (Sweden)

    Randolf Klingebiel

    2008-08-01

    Full Text Available Randolf Klingebiel1, Max Kentenich3, Hans-Christian Bauknecht3, Florian Masuhr2, Eberhard Siebert1, Markus Busch2, Georg Bohner11Department of Neuroradiology, 2Department of Neurology, 3Department of Radiology, Charité Universitary Medicine Berlin, GermanyBackground: Noninvasive 64-slice computed tomography angiography (64-MSCTA closely approximates conventional catheter angiography (DSA in terms of detail resolution. Objective: Retrospective evaluation of cervicocranial (cc 64-MSCTA in comparison with DSA in patients with presumptive cc vascular disorders.Material and methods: Twenty-four 64-MSCTA studies (32 mm detector width, slice thickness 0.5 mm, 120 kv, 150 mAs, pitch 0.75 of patients with presumptive cc vascular pathology (13 men, 11 women, mean age 38.3 ± 11.3 yrs, range 19–54 yrs were assessed in comparison with DSA studies without abnormal findings in age-matched patients (11 men, 13 women, mean age 39.7 ± 11.9 yrs, range 18–54 yrs. Study readings were performed in a blinded manner by two neuroradiologists with respect to image quality and assessibility of various cc vascular segments by using a five-point scale. Radiation exposure was calculated for 64-MSCTA.Results: Each reader assessed 384/528 different vessel segments (64-MSCTA/DSA. Superior image quality was attributed to DSA with respect to the C1 ICA–C6 ICA, A3 ACA, and P3 PCA segments as well the AICA and SCA. 64-MSCTA was scored superior for C7 ICA and V4 VA segments. A significantly increased number of nonassessable V2- and V3 VA segments in DSA studies was noted. The effective dose for 64-MSCTA amounted to 2.2 mSv.Conclusions: 64-MSCTA provides near-equivalent diagnostic information of the cc vasculature as compared with DSA. According to our results, DSA should be considered primarily when peripheral vessels (A3/P3 or ICA segments close to the skull base (C2-5 are of interest, such as in primary angiitis or stenoocclusive ICA disease, respectively.Keywords: CT

  13. Calcium scoring using 64-slice MDCT, dual source CT and EBT: a comparative phantom study

    OpenAIRE

    Groen, Jaap M.; Greuter, Marcel J. W.; Vliegenthart, R.; Suess, C.; Schmidt, B.; Zijlstra, F.; Oudkerk, M.

    2007-01-01

    Purpose Assessment of calcium scoring (Ca-scoring) on a 64-slice multi-detector computed tomography (MDCT) scanner, a dual-source computed tomography (DSCT) scanner and an electron beam tomography (EBT) scanner with a moving cardiac phantom as a function of heart rate, slice thickness and calcium density. Methods and materials Three artificial arteries with inserted calcifications of different sizes and densities were scanned at rest (0 beats per minute) and at 50–110 beats per minute (bpm) w...

  14. Bouveret’s Syndrome: 64-Slice CT Diagnosis and Surgical Management—A Case Report

    Directory of Open Access Journals (Sweden)

    Dinesh Sharma

    2012-01-01

    Full Text Available Gastric outlet obstruction caused by duodenal impaction of a large gallstone migrated through a cholecystoduodenal fistula has been referred to as Bouveret’s syndrome. We present a case of gallstone-induced duodenal obstruction in an elderly female patient, diagnosed on a 64-slice MDCT scanner. One-stage surgery, that is, stone removal and cholecystectomy, was performed resulting in relief of obstruction and complete cure. Clinical features, multidetector computed tomography (MDCT findings, and surgical management are discussed.

  15. Diagnosis of fetal origin of posterior cerebral artery and variation of arteries nearby with 64-slice spiral CT angiography%64层螺旋C TA在胚胎型大脑后动脉及其邻近血管变异诊断中的运用

    Institute of Scientific and Technical Information of China (English)

    彭泽标; 吴宗山; 林承露; 郭磊

    2014-01-01

    Objective To investigate the value of 64-slice spiral CT angiography(CTA)in the diagnosis of fetal origin of posterior cerebral artery (FTP)and the variations of the artery nearby.Methods All images were reconstructed with maximum intensity projection (MIP),volume rendering(VR),multiplanar reconstruction(MPR)and curve planar reconstruction(CPR).Thirty-seven patients with an FTP diagnosed by CTA were analyzed retrospectively to assess the value of CTA in the diagnosis of FTP and the variation of arteries nearby.Re-sults Nine cases variation of the A1 segment of anterior cerebral artery(ACA)and 1 2 cases of variation of the vertebral-basilar artery were found in the 37 patients with FTP.Dysplasia or deficiency of the posterior cerebral artery(PCA)originated from the basilar artery(BA)were demonstrated in all the 37 patients with FTP.Conclusions Patients with FTP are frequently complicated with a variation of the artery nearby and almost all the FTP complicated with the dysplasia or deficiency of the PCA originated from the BA.%目的:探讨64层螺旋CT血管成像(CTA)在诊断胚胎型大脑后动脉(FTP)及其邻近血管变异中的价值。方法采用最大密度投影(MIP),容积再现技术(VR)和曲面重建(CPR)对所采集的头颈血管源图像进行影像重建并回顾性分析37例CTA诊断的FTP影像学资料,研究CTA在FTP的诊断和FTP邻近血管的改变。结果37例FTP中,合并大脑前动脉(ACA)A1段变异9例,合并椎-基底动脉变异12例,所有37例FTP病例同侧基底动脉起源的大脑后动脉(B-PCA)均有不同程度发育不良或缺如。结论 FTP患者常合并邻近血管的变异,几乎所有FTP患者同侧B-PCA发育不良或缺如。

  16. Assessment of Grafts and Coronary Arteries with 64-slice Computer Tomography(CT) Angiography after Coronary Artery Bypass Surgery - our experiences

    OpenAIRE

    Veljanovska, Lidija; Sokolov, V.; Milev, Ivan; Idrizi, Spend; Mitrev, Zan

    2008-01-01

    The use of 64 slice CT (GE Light-Speed VCT) in evaluation of pathway and patency of the grafts, distal anastomosis and native vascular net in patients (pts) after coronary artery bypass grafting (CABG).

  17. 造影剂注射速率对64层螺旋CT冠状动脉血管成像质量的影响%Effect of contrast injection rates on immaging quality of coronary angiography taken by 64-slice spiral CT

    Institute of Scientific and Technical Information of China (English)

    沈栋; 潘昌杰

    2011-01-01

    目的 研究造影剂注射速率对64层螺旋CT冠状动脉血管成像质量的影响.方法 120 例冠状动脉血管造影患者随机均分成三组,分别用4.5、5或5.5ml/s的速率注射等量造影剂.应用64层螺旋CT进行扫描;采用团注实验测定延迟时间;分别在左冠发出层面横断面图像选择感兴趣区测量升、降主动脉衰减值(HU),利用多平面重建技术(MPR)于离出口约1cm处的正交横断面图像测量心脏血管(左主干、前降支、回旋支及右冠状动脉)的衰减值.结果 升、降主动脉及心脏血管三组间对比衰减均有统计学意义(P<0.01).心脏血管对比衰减与体重(r=-0.722)、体重指数(BMI)(r=-0.599)明显相关(P<0.05).以5ml/s速率注射造影剂获得的图像质量优于其它两组(P<0.01).结论 在心脏CT血管造影(CTA)中在扫描条件及造影剂的碘浓度一致情况下,以5ml/s注射速率给予造影剂可以获得良好的血管增强效果.%Objective To study the effect of contrast injection rates on immaging quality of coronary angiography taken by 64-slice spiral CT (64-MSCT). Methods A total of 120 patients undergoing coronary angiography was equally randomized to 3 groups, in which the contrast injection was performed at the flow rates of 4. 5, 5, and 5. 5 ml/s, respectively. The 64-MSCT scanner and scanning protocols were the same for each group. The scanning delay of CT was determined with a bolus test technique. The attenuation in Hounsfield units(HU) achieved after each injection rate was determined at regions of interest(ROIs) placed at the 1 cm origin of coronary arteries measured by multiplanar reconstructions (MPR), which included the left main artery (LMA), left anterior descending artery(LAD), left circumfiex artery(LCX) and right coronary artery(RCA). All data were analyzed with one way ANOVA. The quality of the coronary artery images was evaluated and compared. Results The mean attenuation achieved at each aortic site was

  18. Coronary artery imaging with 64-slice CT in atrial fibrillation patients: scanning method and post-processing techniques

    International Nuclear Information System (INIS)

    Objective: To discuss the clinical value of coronary artery imaging using 64-slice CT in patient with atrial fibrillation. Methods: All the cardiac volume data of 31 patients with atrial fibrillation were reconstructed using absolute time method. The images of 12 patients. The images of 31 patients who undeiwent contrast-enhanced CT coronary angiography were evaluated. The presence of stenosis on each segment of coronary arteries was recorded and their degree of stenosis was measured using the vessel analysis software.. The results of conventional coronary angiography (CAG) of the 10 patients were compared with CT coronary angiography. Results: The image quality of 364 coronary vessel segments on the images from 31 patients was evaluated and defined as excellent, fine, moderate or poor. The image quality was excellent, fine, moderate and poor in 194(53.3%), 82(22.5%), 41(11.3%) and 47(12.9%) vessel segments. Comparison was carried out between CTA findings and CAG findings of the 125 segments of the coronary arteries in the 10 patients who underwent CAG. The sensitivity and specificity of CTA for diagnosing vessel with stenosis (≥ 50% narrowing) was 85%(17/20) and 95.2% (100/105). Conclusion: Coronary artery imaging using 64-slice CT is useful in patient with atrial fibrillation. (authors)

  19. Diagnostic accuracy of 64-slice multidetector CT for detection of in-stent restenosis in an unselected, consecutive patient population

    Energy Technology Data Exchange (ETDEWEB)

    Haraldsdottir, Sigurdis, E-mail: sigurdisha@gmail.com [Boston Medical Center, 72 East Concord Street (Evans 124), Boston, MA, 02118 (United States); Gudnason, Thorarinn, E-mail: thorgudn@landspitali.is [Landspitali University Hospital, Hringbraut, 101 Reykjavik (Iceland); Sigurdsson, Axel F., E-mail: axelfsig@landspitali.is [Landspitali University Hospital, Hringbraut, 101 Reykjavik (Iceland); Gudjonsdottir, Jonina, E-mail: jonina@rd.is [Rontgen Domus Medica, Egilsgata 3, 101 Reykjavik (Iceland); Lehman, Sam J., E-mail: slehman@partners.org [Massachusetts General Hospital, 165 Cambridge Street, Suite 400, Boston, MA 02114 (United States); Eyjolfsson, Kristjan, E-mail: kristey@landspitali.is [Landspitali University Hospital, Hringbraut, 101 Reykjavik (Iceland); Scheving, Sigurpall S., E-mail: sigurpal@landspitali.is [Landspitali University Hospital, Hringbraut, 101 Reykjavik (Iceland); Gibson, C. Michael, E-mail: mgibson@perfuse.org [Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, MA 02115 (United States); Hoffmann, Udo, E-mail: uhoffmann@partners.org [Massachusetts General Hospital, 165 Cambridge Street, Suite 400, Boston, MA 02114 (United States); Jonsdottir, Birna, E-mail: birna@rd.is [Rontgen Domus Medica, Egilsgata 3, 101 Reykjavik (Iceland); Andersen, Karl, E-mail: andersen@landspitali.is [Landspitali University Hospital, Hringbraut, 101 Reykjavik (Iceland)

    2010-11-15

    Objectives: To investigate the diagnostic accuracy of 64-slice multidetector computed tomography (64-CT) for detection of in-stent restenosis (ISR) in an unselected, consecutive patient population. Background: Detection of in-stent restenosis by cardiac CT would be a major advance for the evaluation of patients suspected of having ISR. However, the diagnostic accuracy of current generation 64-CT in this context is not fully established. Methods: We conducted a prospective study on patients with stable angina or acute coronary syndrome with no prior history of coronary artery disease. Six months after percutaneous coronary intervention (PCI) with stent placement they underwent a 64-CT scan (Toshiba Multi-Slice Aquilion 64) and consequently a repeat coronary angiography for comparison. Cardiac CT data sets were analyzed for the presence of in-stent restenosis by two independent expert readers blinded to the coronary angiographic data. Results: Ninety-three patients with a total of 140 stents were evaluated. Males comprised 82% of the study group and the mean age was 63 {+-} 10 years. The mean time from PCI to the repeat coronary angiography was 208 {+-} 37 days and the mean time from 64-CT to repeat coronary angiography was 3.7 {+-} 4.9 days. The restenosis rate according to coronary angiography was 26%. Stent diameter, strut thickness, heart rate and body mass index (BMI) significantly affected image quality. The sensitivity, specificity, positive and negative predictive values of 64-CT for detection of in-stent restenosis were 27%, 95%, 67% and 78%, respectively. Conclusions: Current generation, 64-slice CT, remains limited in its ability to accurately detect in-stent restenosis.

  20. 肋软骨骨折的64层螺旋CT诊断价值分析%Diagnostic value analysis of 64-slice spiral computed tomography in Costal Cartilage Fractures

    Institute of Scientific and Technical Information of China (English)

    周超; 李凤英; 汪云超

    2012-01-01

    Objective To discuss the value of 64-slice spiral CT in diagnosing costal cartilage fracture so as to improve the level of imaging diagnosis. Method Three-dimensional images of 64-slice computed tomography in 28 patients with fracture in costal cartilage were analyzed,and compared with chest plain film and axial CT images. Results In 28 patients, 33 costal cartilage fractures were found with three-dimensional images of 64-slice computed tomography; 23 patients with X-ray, 9 patients with axial CT images did not show costal cartilage fracture.Conclusion Three-dimensional images of 64-slice computed tomography were better than plain film and CT axial scans in costal cartilage fracture, it may be considered as the best imaging method in detecting the costal cartilage fracture.%目的 探讨64层螺旋CT在肋软骨骨折诊断中的价值,提高诊断水平.方法 回顾性分析28例肋软骨骨折患者的64层螺旋CT三维重组图像,并与X线平片CT直接扫描横断位图像对照.结果 28例患者中64层螺旋CT三维重组图像发现肋软骨骨折33处,23例X线平片、9例CT直接横断位图像未显示.结论 64层螺旋CT对肋软骨骨折的显示优于普通X线平片及常规CT胸部横断位图像,可望成为检测肋软骨骨折的最佳影像学检查手段.

  1. The Application of Automatic Tracking and Manually Trigger Technology in Head and Neck 64-slice Spiral CT Angiograph%64排螺旋CT头颈联合CTA成像中自动跟踪与手动触发技术的应用

    Institute of Scientific and Technical Information of China (English)

    叶佳国; 邹才盛; 黄广仁

    2014-01-01

    Objective:To investigate the effect of image quality between automatic tracking and manually trigger technology in head and neck 64-slice spiral CT angiography.Method:100 patients underwent CT head and neck angiography were randomly divided into the group A and the group B,50 cases in each group.Group A:when the mean CT value of region of interest(ROI) determined in the top of the aortic arch reached the threshold preset value(threshold 90 HU),the computer started a scanning automatically.Group B:after contrast injection,when the contrast appeared in the top of the aortic arch, the scan was started manually.Analyzed the image quality,recorded the time from contrast injection to scan, excluding the unsuccessful and poor display of images.The mean CT value of the top of the aortic arch,the C5 segment of the carotid bifurcation,the C1 segment of the internal carotid artery and middle cerebral artery were measured.Result:The image quality of group B was better than group A,the difference was statistically significant(χ²=6.205,P=0.044). The monitoring time in group B was (13.32±1.63)s,it was significantly less than (14.24±1.73)s in group A,the difference was statistically significant(P=0.007).The average CT value of aortic arch was significantly lower than the group A(P0.05).Conclusion:The satisfactory images can easier obtain using the manually trigger technology than automatic tracking,and save time.%目的:探讨自动跟踪与手动触发技术在Philips 64排螺旋CT对头颈联合CTA成像图像质量的影响。方法:将接受头颈联合CTA检查的100例患者按照随机数字表法分为A组和B组各50例。A组于监控层面主动脉弓层感兴趣区域CT值达阈值(阈值设定为90 HU)后自动跟踪智能触发扫描。B组在对比剂开始注射后观察监控层主动脉弓层对比剂的增强程度,当观察到对比剂开始进入监控层时按下手动按钮触发扫描。统计分析两组的图像质量、记录监控时间

  2. The evaluation of 64-slice spiral CT perfusion to hepatic fibrosis of dog model and the correlation research with pathologic and VEGF change%犬肝纤维化64排螺旋CT全肝灌注成像及与病理对照、VEGF表达的相关研究

    Institute of Scientific and Technical Information of China (English)

    胡跃群; 章雅琴; 李丛蕊; 骆雷; 容鹏飞; 王维

    2011-01-01

    目的 利用64排螺旋CT全肝灌注模式成像测定中华田园犬肝纤维化模型的相关灌注参数并与病理对照来反映肝纤维化程度,分析其与VEGF表达水平的相关性.方法 采用腹腔注射50%四氯化碳油溶液辅以高脂饮食,建立犬肝纤维化模型,定期行64排螺旋CT全肝灌注成像及肝穿活检.根据病理分期分析各组CT灌注参数,并与VEGF表达水平作对照研究.结果 成功获得各期肝纤维化模型.对照组HAP(28.25 ±2.19) ml/(min·100 g),PVP( 53.53±10.71) ml/( min ·100 g),TLP(81.78±18.56) ml/(min·100 g);随肝纤维化程度加重,PVP、TLP持续性下降(P<0.05),HAP总体略呈上升趋势.PVP值、TLP值与肝纤维化程度呈负相关(P<0.01);VEGF表达水平随着肝纤维化程度的加重而明显增高(P<0.05).结论 腹腔注射四氯化碳油溶液辅以高脂饮食可以成功模拟人类从肝细胞变性、肝纤维化至肝硬化的全过程.64排螺旋CT全肝灌注成像克服了以往灌注成像的不足,且能反映肝纤维化各期的血流动力学变化趋势,VEGF可能在慢性肝病所致肝纤维化过程中起重要作用.%Objective To measure the perfusion parameters of liver fibrosis of dog model with 64-slice spiral CT,and compare with positive control to reflect the degree of liver fibrosis,and analyze the correlation with VEGF values.Methods Liver fibrosis was induced in dogs by intraperitoneal injection of CC14 and high fat diet.CT perfusion scan and liver biopsies were performed.The perfusion parameters were measured according to the liver fibrosis models,and the correlation with VEGF values was analyzed.Results The animals in experimental group were successfully induced different degree of liver fibrosis.In normal group,the hepatic artery perfusion,portal vein perfusion and total hepatic blood flow were (28.25 ±2.19)ml/(min · 100 g),(53.53 ± 10.71)ml/(min · 100 g) and (81.78 ± 18.56) ml/(min · 100 g).The PVP and TLP values of the

  3. Optimal scanning protocols of 64-slice CT angiography in coronary artery stents: An in vitro phantom study

    Energy Technology Data Exchange (ETDEWEB)

    Almutairi, Abdulrahman Marzouq [Discipline of Medical Imaging, Department of Imaging and Applied Physics, Curtin University of Technology, Perth, Western Australia (Australia); Sun Zhonghua [Discipline of Medical Imaging, Department of Imaging and Applied Physics, Curtin University of Technology, Perth, Western Australia (Australia)], E-mail: z.sun@curtin.edu.au; Ng, Curtise [Discipline of Medical Imaging, Department of Imaging and Applied Physics, Curtin University of Technology, Perth, Western Australia (Australia); Al-Safran, Zakariya A.; Al-Mulla, Abeer A.; Al-Jamaan, Abdulaziz I. [Department of Medical Imaging, King Fahad Specialist Hospital, Dammam (Saudi Arabia)

    2010-04-15

    Purpose: The purpose of the study was to investigate the optimal scanning protocol of 64-slice CT angiography for assessment of coronary artery stents based on a phantom study. Materials and methods: Coronary stents with a diameter of 2.5 mm was implanted in thin plastic tubes with an inner diameter of 3.0 mm to simulate a coronary artery. The tubes were filled with iodinated contrast medium diluted to 178 HU, closed at both ends and positioned in a plastic container filled with vegetable oil (-70 to -100 HU). A series of scans were performed with a 64-slice CT scanner with the following protocols: section thickness: 0.67 mm, 1.0 mm, 1.5 mm, 2.0 mm, pitch value: 0.2, 0.3, 0.5 and reconstruction interval of 50% overlap of the section thickness. 2D axial and multiplanar reformatted images were generated to assess the visibility of stent lumen, while virtual intravascular endoscopy (VIE) was reconstructed to evaluate the artery wall and stent surface. Results: Our results showed that a scanning protocol of 1.0 mm slice thickness with a pitch of 0.3 produced acceptable images with best demonstration of the intrastent lumen and stent surface with minimal image noise or artifacts. In contrast, submillimeter scans with 0.67 mm resulted in moderate artifacts which affected visualization of the coronary lumen, in addition to the increased noise. When the section thickness increased to 1.5 mm and 2.0 mm, visualization of the artery wall and stent surface was compromised, although the intrastent lumen was still visible. Conclusion: Our in vitro study suggested that a scanning protocol of 1.0 mm section thickness with pitch of 0.3 is the optimal protocol for evaluation of coronary artery stents as it allows generation of acceptable images with better visualization of stent lumen, stent surface and coronary artery wall.

  4. Optimal scanning protocols of 64-slice CT angiography in coronary artery stents: An in vitro phantom study

    International Nuclear Information System (INIS)

    Purpose: The purpose of the study was to investigate the optimal scanning protocol of 64-slice CT angiography for assessment of coronary artery stents based on a phantom study. Materials and methods: Coronary stents with a diameter of 2.5 mm was implanted in thin plastic tubes with an inner diameter of 3.0 mm to simulate a coronary artery. The tubes were filled with iodinated contrast medium diluted to 178 HU, closed at both ends and positioned in a plastic container filled with vegetable oil (-70 to -100 HU). A series of scans were performed with a 64-slice CT scanner with the following protocols: section thickness: 0.67 mm, 1.0 mm, 1.5 mm, 2.0 mm, pitch value: 0.2, 0.3, 0.5 and reconstruction interval of 50% overlap of the section thickness. 2D axial and multiplanar reformatted images were generated to assess the visibility of stent lumen, while virtual intravascular endoscopy (VIE) was reconstructed to evaluate the artery wall and stent surface. Results: Our results showed that a scanning protocol of 1.0 mm slice thickness with a pitch of 0.3 produced acceptable images with best demonstration of the intrastent lumen and stent surface with minimal image noise or artifacts. In contrast, submillimeter scans with 0.67 mm resulted in moderate artifacts which affected visualization of the coronary lumen, in addition to the increased noise. When the section thickness increased to 1.5 mm and 2.0 mm, visualization of the artery wall and stent surface was compromised, although the intrastent lumen was still visible. Conclusion: Our in vitro study suggested that a scanning protocol of 1.0 mm section thickness with pitch of 0.3 is the optimal protocol for evaluation of coronary artery stents as it allows generation of acceptable images with better visualization of stent lumen, stent surface and coronary artery wall.

  5. Acute subarachnoid hemorrhage: using 64-slice multidetector CT angiography to ''triage'' patients' treatment

    Energy Technology Data Exchange (ETDEWEB)

    Agid, R.; Lee, S.K.; Willinsky, R.A.; Farb, R.I.; TerBrugge, K.G. [Toronto Western Hospital, Division of Neuroradiology, Department of Medical Imaging, Toronto, Ontario (Canada)

    2006-11-15

    To evaluate the clinical role of CT angiography (CTA) in patients with acute subarachnoid hemorrhage (SAH) for treatment decision-making. Consecutive patients with acute SAH had CTA using a 64-slice scanner for initial clinical decision-making. Image processing included multiplanar volume reformatted (MPVR) maximum intensity projections (MIP) and 3D volume-rendered reconstructions. CTAs were used for (1) evaluating the cause of SAH, and (2) triaging aneurysm-bearing patients to the more appropriate management, either surgical clipping or endovascular coiling. CTA findings were confirmed by neurosurgical exploration or catheter angiography (digital subtraction angiography, DSA). Successful coiling provided evidence that triaging to endovascular treatment was correct. Included in the study were 73 patients. CTA findings were confirmed by DSA or neurosurgical operation in 65 patients, and of these 65, 47 had aneurysmal SAH, 3 had vasculitis, 1 had arterial dissection and 14 had no underlying arterial abnormality. The cause of SAH was detected with CTA in 62 out of the 65 patients (95.4%, sensitivity 94%, specificity 100%). CTA revealed the aneurysm in 46 of 47 patients (98%, sensitivity 98%, specificity 100%, positive predictive value 100%, negative predictive value 82.3%), 1 of 3 vasculitides and 1 of 1 dissection. Of the 46 patients with aneurysm, 44 (95.7%) were referred for treatment based on CTA. In 2 patients (2 of 46, 4.4%) CTA was not informative enough to choose treatment requiring DSA. Of the 44 patients, 27 (61.4%) were referred to endovascular treatment and successful coiling was achieved in 25 (25 of 27, 92.6%). CTA using a 64-slice scanner is an accurate tool for detecting and characterizing aneurysms in acute SAH. CTA is useful in the decision process whether to coil or clip an aneurysm. (orig.)

  6. Integrated cardio-thoracic imaging with ECG-Gated 64-slice multidetector-row CT: initial findings in 133 patients

    Energy Technology Data Exchange (ETDEWEB)

    Salem, Randa; Remy-Jardin, Martine; Delhaye, Damien; Khalil, Chadi; Teisseire, Antoine; Remy, Jacques [Hospital Calmette, University Center of Lille, Department of Thoracic Imaging, LILLE cedex (France); Delannoy-Deken, Valerie; Duhamel, Alain [University of Lille, Place de Verdun, Department of Medical Statistics, LILLE cedex (France)

    2006-09-15

    The purpose of this study was to investigate the possibility of assessing the underlying respiratory disease as well as cardiac function during ECG-gated CT angiography of the chest with 64-slice multidetector-row CT (MDCT). One hundred thirty-three consecutive patients in sinus rhythm with known or suspected ventricular dysfunction underwent an ECG-gated CT angiographic examination of the chest without {beta}-blockers using the following parameters: (1) collimation: 32 x 0.6 mm with z-flying focal spot for the acquisition of 64 overlapping 0.6-mm slices (Sensation 64; Siemens); rotation time: 0.33 s; pitch: 0.3; 120 kV; 200 mAs; ECG-controlled dose modulation (ECG-pulsing) and (2) 120 ml of a 35% contrast agent. Data were reconstructed: (1) to evaluate the underlying respiratory disease (1-mm thick lung and mediastinal scans reconstructed at 55% of the R-R interval; i.e., ''morphologic scans'') and (2) to determine right (RVEF) and left (LVEF) ventricular ejection fractions (short-axis systolic and diastolic images; Argus software; i.e., ''functional scans''). The mean heart rate was 73 bpm (range: 42-120) and the mean scan time was 18.11{+-}2.67 s (range: 10-27). A total of 123 examinations (92%) had both lung and mediastinal images rated as diagnostic scans, whereas 10 examinations (8%) had non-diagnostic images altered by the presence of respiratory-motion artifacts (n=4) or cyclic artifacts related to the use of a pitch value of 0.3 in patients with a very low heart rate during data acquisition (n=6). Assessment of right and left ventricular function was achievable in 124 patients (93%, 95% CI: 88-97%). For these 124 examinations, the mean RVEF was 46.10% ({+-}9.5; range: 20-72) and the mean LVEF was 58.23% ({+-}10.88; range: 20-83). In the remaining nine patients, an imprecise segmentation of the right and left ventricular cavities was considered as a limiting factor for precise calculation of end-systolic and end

  7. Radiation Exposure of Ovarian Cancer Patients: Contribution of CT Examinations Performed on Different MDCT (16 and 64 Slices) Scanners and Image Quality Evaluation

    OpenAIRE

    Rizzo, S; D. Origgi; Brambilla, S.; Maria, F.; Foà, R; Raimondi, S; N. Colombo; Bellomi, M.

    2015-01-01

    Abstract The objective of this study is to compare radiation doses given to ovarian cancer patients by different computed tomographies (CTs) and to evaluate association between doses and subjective and objective image quality. CT examinations included were performed either on a 16-slice CT, equipped with automatic z-axis tube current modulation, or on a 64-slice CT, equipped with z-axis, xy-axis modulation, and adaptive statistical iterative algorithm (ASIR). Evaluation of dose included the f...

  8. Radiation exposure of ovarian cancer patients: contribution of CT examinations performed on different MDCT (16 and 64 slices) scanners and image quality evaluation: an observational study.

    Science.gov (United States)

    Rizzo, Stefania; Origgi, Daniela; Brambilla, Sarah; De Maria, Federica; Foà, Riccardo; Raimondi, Sara; Colombo, Nicoletta; Bellomi, Massimo

    2015-05-01

    The objective of this study is to compare radiation doses given to ovarian cancer patients by different computed tomographies (CTs) and to evaluate association between doses and subjective and objective image quality.CT examinations included were performed either on a 16-slice CT, equipped with automatic z-axis tube current modulation, or on a 64-slice CT, equipped with z-axis, xy-axis modulation, and adaptive statistical iterative algorithm (ASIR). Evaluation of dose included the following dose descriptors: volumetric CT dose index (CTDIvol), dose length product (DLP), and effective dose (E). Objective image noise was evaluated in abdominal aorta and liver. Subjective image quality was evaluated by assessment of image noise, spatial resolution and diagnostic acceptability.Mean and median CTDIvol, DLP, and E; correlation between CTDIvol and DLP and patients' weight; comparison of objective noise for the 2 scanners; association between dose descriptors and subjective image quality.The 64-slice CT delivered to patients 24.5% lower dose (P descriptors (CTDIvol, DLP, E) and weight (P descriptors and image noise for the 64-slice CT, and between dose descriptors and spatial resolution for the 16-slice CT.Current dose reduction systems may reduce radiation dose without significantly affecting image quality and diagnostic acceptability of CT exams. PMID:25929914

  9. Downstream resource utilization following hybrid cardiac imaging with an integrated cadmium-zinc-telluride/64-slice CT device

    International Nuclear Information System (INIS)

    Low yield of invasive coronary angiography and unnecessary coronary interventions have been identified as key cost drivers in cardiology for evaluation of coronary artery disease (CAD). This has fuelled the search for noninvasive techniques providing comprehensive functional and anatomical information on coronary lesions. We have evaluated the impact of implementation of a novel hybrid cadmium-zinc-telluride (CZT)/64-slice CT camera into the daily clinical routine on downstream resource utilization. Sixty-two patients with known or suspected CAD were referred for same-day single-session hybrid evaluation with CZT myocardial perfusion imaging (MPI) and coronary CT angiography (CCTA). Hybrid MPI/CCTA images from the integrated CZT/CT camera served for decision-making towards conservative versus invasive management. Based on the hybrid images patients were classified into those with and those without matched findings. Matched findings were defined as the combination of MPI defect with a stenosis by CCTA in the coronary artery subtending the respective territory. All patients with normal MPI and CCTA as well as those with isolated MPI or CCTA finding or combined but unmatched findings were categorized as ''no match''. All 23 patients with a matched finding underwent invasive coronary angiography and 21 (91%) were revascularized. Of the 39 patients with no match, 5 (13%, p < 0.001 vs matched) underwent catheterization and 3 (8%, p < 0.001 vs matched) were revascularized. Cardiac hybrid imaging in CAD evaluation has a profound impact on patient management and may contribute to optimal downstream resource utilization. (orig.)

  10. Quantitative evaluation of benign meningioma and hemangiopericytoma with peritumoral brain edema by 64-slice CT perfusion imaging

    Institute of Scientific and Technical Information of China (English)

    REN Guang; CHEN Shuang; WANG Yin; ZHU Rui-jiang; GENG Dao-ying; FENG Xiao-yuan

    2010-01-01

    Background Hemangiopericytomas (HPCs) have a relentless tendency for local recurrence and metastases,differentiating between benign meningiomas and HPCs before surgery is important for both treatment planning and the prognosis appraisal.The purpose of this study was to evaluate the correlations between CT perfusion parameters and microvessel density (MVD) in extra-axial tumors and the possible role of CT perfusion imaging in preoperatively differentiating benign meningiomas and HPCs.Methods Seventeen patients with benign meningiomas and peritumoral edema, 12 patients with HPCs and peritumoral edema underwent 64-slice CT perfusion imaging pre-operation.Perfusion was calculated using the Patlak method.The quantitative parameters, include cerebral blood volume (CBV), permeability surface (PS) of parenchyma, peritumoral edema among benign meningiomas and HPCs were compared respectively.CBV and PS in parenchyma, peritumoral edema of benign meningiomas and HPCs were also compared to that of the contrallateral normal white matter respectively.The correlations between CBV, PS of tumoral parenchyma and MVD were examined.Results The value of CBV and PS in parenchyma of HPCs were significantly higher than that of benign meningiomas (P<0.05), while the values of CBV and PS in peritumoral edema of benign meningiomas and HPCs were not significantly different (P >0.05).MVD in parenchyma of HPCs were significantly higher than that of benign meningiomas (P<0.05).There were positive correlations between CBV and MVD (r=0.648, P<0.05), PS and MVD (r=0.541, P<0.05) respectively.Furthermore, the value of CBV and PS in parenchyma of benign meningiomas and HPCs were significantly higher than that of contrallateral normal white matter (P<0.05), the value of CBV in peritumoral edema of benign meningiomas and HPCs were significantly lower than that of contrallateral normal white matter (P<0.05), while the value of PS in peritumoral edema of benign meningiomas and HPCs were not

  11. 东软64层CT整机研制及关键技术研发%Neusoft 64-slice CT Scanner Development with Key Technology

    Institute of Scientific and Technical Information of China (English)

    马建华; 张华; 边兆英; 李双学; 赵大哲; 陈武凡

    2015-01-01

    目的:64层C T整机研制与关键技术研发。方法:按照产、学、研、医联合方式,通过原始与系统创新,攻克系统平台技术、数据采集技术、低剂量成像伪影校正及噪声抑制技术、图像重建及优化技术等多项64层C T关键技术。结果:成功研制出中国首台具有完全自主知识产权的64层CT整机,其性能指标达到国际同类产品先进水平,产品通过CCC、SFDA,CE、FDA、CB、CSA等认证。结论:东软集团的64层CT已正式进入医用CT高端市场。%Objective:developing 64-slice CT scanner with key technology research.Methods: under industry-university-research-medicine cooperation pattern, through the original and system innovation, we conquer many 64-slice CT key technologies, including system platform technology, data acquisition technology, low-dose imaging artifacts correction and noise suppression technology, image reconstruction and optimization technology and so on.Results: The developed ifrst 64-slice CT scanner of China contains ful independent intelectual property rights with international advanced levels and geting the CCC, SFDA, CE, FDA, CB, CSA certiifcations, etc.Conclusion: Neusoft 64-slice CT scanner has formaly entered the medical CT high-end market.

  12. Bicuspid aortic valves: Diagnostic accuracy of standard axial 64-slice chest CT compared to aortic valve image plane ECG-gated cardiac CT

    International Nuclear Information System (INIS)

    Objectives: To assess the diagnostic accuracy of standard axial 64-slice chest CT compared to aortic valve image plane ECG-gated cardiac CT for bicuspid aortic valves. Materials and methods: The standard axial chest CT scans of 20 patients with known bicuspid aortic valves were blindly, randomly analyzed for (i) the appearance of the valve cusps, (ii) the largest aortic sinus area, (iii) the longest aortic cusp length, (iv) the thickest aortic valve cusp and (v) valve calcification. A second blinded reader independently analyzed the appearance of the valve cusps. Forty-two age- and sex-matched patients with known tricuspid aortic valves were used as controls. Retrospectively ECG-gated cardiac CT multiphase reconstructions of the aortic valve were used as the gold-standard. Results: Fourteen (21%) scans were scored as unevaluable (7 bicuspid, 7 tricuspid). Of the remainder, there were 13 evaluable bicuspid valves, ten of which showed an aortic valve line sign, while the remaining three showed a normal Mercedes-Benz appearance owing to fused valve cusps. The 35 evaluable tricuspid aortic valves all showed a normal Mercedes-Benz appearance (P = 0.001). Kappa analysis = 0.62 indicating good interobserver agreement for the aortic valve cusp appearance. Aortic sinus areas, aortic cusp lengths and aortic cusp thicknesses of ≥3.8 cm2, 3.2 cm and 1.6 mm respectively on standard axial chest CT best distinguished bicuspid from tricuspid aortic valves (P < 0.0001 for all). Of evaluable scans, the sensitivity, specificity, positive and negative predictive values of standard axial chest CT in diagnosing bicuspid aortic valves was 77% (CI 0.54–1.0), 100%, 100% and 70% respectively. Conclusion: The aortic valve is evaluable in approximately 80% of standard chest 64-slice CT scans. Bicuspid aortic valves may be diagnosed on evaluable scans with good diagnostic accuracy. An aortic valve line sign, enlarged aortic sinuses and elongated, thickened valve cusps are specific CT

  13. The Value of 64-slice Spiral CT with 3D Transparency Reconstruction in the Diagnosis of Inner ear Malformation:Analysis of 32 Cases%64排CT三维透明化重组在内耳畸形诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    王丹; 曹绍东; 申宝忠; 张同; 白荣杰; 王可铮; 徐艳

    2011-01-01

    目的 探讨三维透明化重组在内耳畸形诊断中的应用价值,为先天性内耳疾病提供准确的影像诊断和临床治疗信息.资料与方法 回顾32耳内耳畸形的64排高分辨率CT(HRCT)容积数据,行三维透明化重组处理,按内耳畸形分类总结三维透明化重组方法及影像表现.结果 32耳的三维透明化容积再现(VR)图像结合透明化多平面重组(MPR)图像均能很好揭示内耳畸形病变部位及程度,内耳病变整体显示方面及蜗窗、前庭窗、半规管等细节病变显示中透明化VR像及透明化MPR像明显优于轴位像及普通MPR像;在耳蜗内部结构的显示中,透明化MPR、轴位像及普通MPR像优于透明化VR像.32耳先天内耳发育畸形有以下几种:耳蜗未发育(2耳);共同腔畸形(4耳);不完全分隔Ⅰ型(2耳,2例患者对侧耳均为共同腔畸形);不完全分隔Ⅱ型(即Mondini型)(16耳,多合并前庭、半规管及前庭导水管畸形);单纯前庭-半规管畸形(2耳);单纯前庭导水管扩大(6耳).结论 三维透明化个性重组能准确}半价内耳先天性疾病的类型和程度,为临床治疗提供重要的参考依据.%Objective To investigate the role of 3D transparency reconstruction in displaying the inner ear malformation. Materials and Methods Thirty-two cases of inner ear malformation were analyzed retrospectively. The data of 64 slice HRCT were processed using 3D transparency reconstruction. The imaging findings were summarized according to the categorization of the disease. Results The malformations included cochlear aplasia(2 ears), Common cavity deformity (4 ears), incomplete partition Ⅰ (2 ears ), incomplete partition Ⅱ ( Mondini deformity ) ( 16 ears), vestibular and semicircular canal malformations(3 ears) and vestibular aqueduct dilate(6 ears). The site and degree of inner ear malformation were displayed clearly by 3D transparent reconstruction imaging and MPR transparent imaging. Transparent MPR and VR

  14. Clinical application of 64-slice spiral computed tomography perfusion imaging technology in kidney disease%64层CT灌注成像技术在肾脏疾病中的应用价值

    Institute of Scientific and Technical Information of China (English)

    唐烨真; 杜涛明; 唐光才; 兰永树; 涂永波; 林伟

    2013-01-01

    Objective: To investigate the clinical application value of 64-slice spiral CT perfusion imaging in kidney diseases diagnosis. Methods: Totally 40 patients met the case criteria, 64-slice spiral CT was used for renal perfusion scan. To observe the sharp of TDC, to records and count BF、BV、MTT and PS of every group. Results: To the same client, the perfusion parameters, index of BF, BV and PS averages and standard deviations of both sides of the kidney had no significant difference (P>0. 05). The BF, BV, MTT and PS among group of renal tumor, cirrhosis, hypertension and control had statistical differences ( P <0. 05). Conclusion: CTPI technologies can evaluate renal function in many aspects, with a promising application prospect.%目的:探讨64层CT灌注扫描技术在肾脏疾病诊断中的临床应用价值.方法:对40例符合入选标准的受检者行双肾灌注扫描,观察TDC形态,记录各组血流量(blood flow,BF)、血容量(blood volume,BV)、平均通过时间(mean transit time,MTT)、表面渗透性(permeability surface,PS)值,并进行统计学分析.结果:同一受检者两侧肾脏BF、BV和PS等参数差异无统计学意义(P>0.05).肾脏肿瘤、肝硬化、高血压及正常组各组间BF、BV及PS差异均有统计学意义(P<0.05).结论:CT灌注成像能从多方面对肾功能进行评价,具有良好的应用前景.

  15. New Progress of Post 64 Slice CT for Coronary Artery%后64排螺旋CT冠脉检查新进展

    Institute of Scientific and Technical Information of China (English)

    赵义芹; 祖德贵; 曾庆玉

    2012-01-01

    64排CT冠状动脉成像已成为冠脉病变诊断及筛查的重要无创性检查,但心律不齐、心动过速、钙化支架伪影仍影响其冠脉成像质量以及辐射剂量过高。本文总结了后64排CT如双源CT、Brilliance ICT、宝石CT、320排CT在上述检查中取得的进展和仍然存在的不足,表明后64排CT的辐射剂量均有所减低,双源CT、Brilliance ICT随着时间分辨率的提高基本上解决了心动过速的问题,320排CT根本上解决了心律不齐的问题,并对后64排螺旋CT冠脉检查的发展前景进行讨论。%64-slice CT coronary artery imaging has gradually become the important noninvasive test of diagnosis and screening for coronary artery disorder,whose quality is still limited by cardiac arrhythmia,tachycardia,calcification and stents,and it has excessive radiation dose.The paper sums up the progress and disadvantage of post 64 Slice CT such as dual CT,Brilliance ICT,Gemstone CT,and 320 slice CT,shows the radiation dose has been cut down,indicates that tachycardia is settled essentially in Dual CT and Brilliance ICT with the improvement of temporal resolution and cardiac arrhythmia is resolved radically in 320 slice CT,at last,discusses the investigative foreground of post 64 Slice CT for coronary artery.

  16. Bicuspid aortic valves: Diagnostic accuracy of standard axial 64-slice chest CT compared to aortic valve image plane ECG-gated cardiac CT

    Energy Technology Data Exchange (ETDEWEB)

    Murphy, David J., E-mail: david.murphy@st-vincents.ie [Department of Radiology, St Vincent' s University Hospital, Elm Park, Dublin 4 (Ireland); McEvoy, Sinead H., E-mail: s.mcevoy@st-vincents.ie [Department of Radiology, St Vincent' s University Hospital, Elm Park, Dublin 4 (Ireland); Iyengar, Sri, E-mail: sri.iyengar@nhs.net [Department of Radiology, Plymouth Hospitals NHS Trust, Plymouth Devon PL6 8DH (United Kingdom); Feuchtner, Gudrun, E-mail: Gudrun.Feuchtner@i-med.ac.at [Department of Radiology, Innsbruck Medical University, Anichstr. 35, A-6020 Innsbruck (Austria); Cury, Ricardo C., E-mail: r.cury@baptisthealth.net [Department of Radiology, Baptist Cardiac and Vascular Institute, 8900 North Kendall Drive, Miami, FL 33176 (United States); Roobottom, Carl, E-mail: carl.roobottom@nhs.net [Department of Radiology, Plymouth Hospitals NHS Trust, Plymouth Devon PL6 8DH (United Kingdom); Plymouth University Peninsula Schools of Medicine and Dentistry (United Kingdom); Baumueller, Stephan, E-mail: Hatem.Alkadhi@usz.ch [Institute for Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich (Switzerland); Alkadhi, Hatem, E-mail: stephan.baumueller@usz.ch [Institute for Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich (Switzerland); Dodd, Jonathan D., E-mail: jonniedodd@gmail.com [Department of Radiology, St Vincent' s University Hospital, Elm Park, Dublin 4 (Ireland)

    2014-08-15

    Objectives: To assess the diagnostic accuracy of standard axial 64-slice chest CT compared to aortic valve image plane ECG-gated cardiac CT for bicuspid aortic valves. Materials and methods: The standard axial chest CT scans of 20 patients with known bicuspid aortic valves were blindly, randomly analyzed for (i) the appearance of the valve cusps, (ii) the largest aortic sinus area, (iii) the longest aortic cusp length, (iv) the thickest aortic valve cusp and (v) valve calcification. A second blinded reader independently analyzed the appearance of the valve cusps. Forty-two age- and sex-matched patients with known tricuspid aortic valves were used as controls. Retrospectively ECG-gated cardiac CT multiphase reconstructions of the aortic valve were used as the gold-standard. Results: Fourteen (21%) scans were scored as unevaluable (7 bicuspid, 7 tricuspid). Of the remainder, there were 13 evaluable bicuspid valves, ten of which showed an aortic valve line sign, while the remaining three showed a normal Mercedes-Benz appearance owing to fused valve cusps. The 35 evaluable tricuspid aortic valves all showed a normal Mercedes-Benz appearance (P = 0.001). Kappa analysis = 0.62 indicating good interobserver agreement for the aortic valve cusp appearance. Aortic sinus areas, aortic cusp lengths and aortic cusp thicknesses of ≥3.8 cm{sup 2}, 3.2 cm and 1.6 mm respectively on standard axial chest CT best distinguished bicuspid from tricuspid aortic valves (P < 0.0001 for all). Of evaluable scans, the sensitivity, specificity, positive and negative predictive values of standard axial chest CT in diagnosing bicuspid aortic valves was 77% (CI 0.54–1.0), 100%, 100% and 70% respectively. Conclusion: The aortic valve is evaluable in approximately 80% of standard chest 64-slice CT scans. Bicuspid aortic valves may be diagnosed on evaluable scans with good diagnostic accuracy. An aortic valve line sign, enlarged aortic sinuses and elongated, thickened valve cusps are specific CT

  17. Coronary imaging quality in routine ECG-gated multidetector CT examinations of the entire thorax: preliminary experience with a 64-slice CT system in 133 patients

    Energy Technology Data Exchange (ETDEWEB)

    Delhaye, Damien; Remy-Jardin, Martine; Salem, Randa; Teisseire, Antoine; Khalil, Chadi; Remy, Jacques [Hospital Calmette, University Center of Lille, Department of Thoracic Imaging, Lille Cedex (France); Delannoy-Deken, Valerie; Duhamel, Alain [University of Lille, Department of Medical Statistics, Lille Cedex (France)

    2007-04-15

    To evaluate image quality in the assessment of the coronary arteries during routine ECG-gated multidetector CT (MDCT) of the chest. One hundred and thirty three patients in sinus rhythm underwent an ECG-gated CT angiographic examination of the entire chest without {beta}-blockers with a 64-slice CT system. In 127 patients (95%), it was possible to assess the coronary arteries partially or totally; coronary artery imaging failed in six patients (5%), leading to a detailed description of the coronary arteries in 127 patients. Considering ten coronary artery segments per patient, 75% of coronary segments were assessable (948/1270 segments). When the distal segments were excluded from the analysis (i.e., seven coronary segments evaluated per patient), the percentage of assessable segments was 86% (768/889 proximal and mid coronary segments) and reached 93% (474/508) when assessing proximal segments exclusively. The mean number of assessable segments was significantly higher in patients with a heart rate {<=}80 bpm (n=95) than in patients with a heart rate >80 bpm (n=38) (p<0.002). Proximal and mid-coronary segments can be adequately assessed during a whole-chest ECG-gated CT angiographic examination without administration of {beta}-blockers in patients with a heart rate below 80 bpm. (orig.)

  18. Bone Subtraction 3-Dimension CT Angiography Using 64-Slice Multidetector CT for the Evaluation of Steno-Occlusive Intra- and Extracranial Vascular Diseases: Comparison with Digital Subtraction Angiography

    Energy Technology Data Exchange (ETDEWEB)

    Park, Sung Eun; Choi, Dae Seob; Shin, Hwa Seon; You, Jin Jong; Park, Mi Jung; Cho, Jae Min; Choi, Ho Cheol; Son, Seung Nam [Gyeongsang National University School of Medicine, Jinju (Korea, Republic of); Ryu, Jae Wook [Dept. of Radiology, Samsung Seoul Hospital, Seoul (Korea, Republic of)

    2012-09-15

    To investigate the efficacy of bone subtraction CT angiography (BSCTA) for the evaluation of steno-occlusive intra- and extracranial vascular diseases. Fifty-six patients were examined using 64-slice multidetector CT and digital subtraction angiography (DSA). For BSCTA, both nonenhanced CT and enhanced CT angiography (CTA) data sets were obtained. The stenotic degree of each vascular segment was assessed and classified into 5 grades. With DSA as the standard, CTA images were compared. For the evaluation of the extracranial vessels, 370 arterial segments were analyzed, and the stenotic degree revealed by CTA and DSA agreed in 359 (97.0%). There was a significant correlation between CTA and DSA (Rs = 0.974). For depiction of {>=} 50% stenosis, the sensitivity, specificity, and diagnostic accuracy of BSCTA were 100%, 98.2%, and 98.6%, respectively. For the intracranial arteries, 1029 segments were analyzed, and CTA agreed with DSA in 966 (93.9%). There was a significant correlation between CTA and DSA for stenotic degree (Rs = 0.880). For the depiction of {>=} 50% stenosis, the sensitivity, specificity, and diagnostic accuracy of CTA were 100%, 95.8%, and 96.0%, respectively. In all 74 segments of disagreement, the degree of stenosis was overestimated on CTA. BSCTA is comparable to DSA for the evaluation of steno-occlusive intra- and extracranial vascular diseases. However, the stenotic degree tends to be overestimated on BSCTA, especially in cases of wall calcifications.

  19. Influence of heart rate on image quality of 64-slice spiral computed coronary angiography and optimization on reconstruction of phase window

    International Nuclear Information System (INIS)

    Objective: To evaluate the influence of heart rate on the image quality of 64-slice spiral computed coronary angiography (MSCTCA) and optimize the image reconstruction window. Methods: According to the heart rate, 86 patients were classified into 5 groups: group A, the heart rate ≤60 beat per minute(BMP); group B,61-70BMP, group C,71-80BMP, and group D>80BMP. The image quality of MSCTCA was scored 5 grades from 1-5 according to heart motion artifact. The influences of heart rate and reconstruction phase on the image quality of MSCTCA were evaluated. Results: Average heart rate was 64.4 ±10.1BMP. Diagnostic image quality (score>3) was attained in 277 of 344 segments at the best reconstruction interval. There was a significant corxelation between average heart rate and image quality, but there was no difference between relative delay (%) reconstruction and absolute delay (ms) reconstruction on the image quality. Conclusion: Reducing average heart rate is beneficial for improving the image quality. (authors)

  20. 64排螺旋CT泌尿系三维成像患者的护理%Nursing of patients undergoing 64-slice CT urography

    Institute of Scientific and Technical Information of China (English)

    高丽; 张金玲; 赵云霞; 申秀芬

    2009-01-01

    目的 探讨护理工作在64排螺旋CT泌尿系三维成像(MSCTU)中的价值.方法 240例患者应用64排螺旋CT进行泌尿系三维成像检查,检查前询问病史及碘过敏史,关注患者的心理状态,做好碘预试验;检查中认真观察患者,对可能出现的任何不良反应进行预判,并制订相应的措施;检查后对症处理出现的各种情况,并做好护理指导.结果 239例患者顺利完成检查,1例在扫描过程中出现药物外渗,扫描失败,经过重新扫描,获得满意图像.结论 利用64排螺旋CT行泌尿系三维成像检查,作为一种无创伤、费用相对较低、安全性高的检查技术,护理操作应贯穿检查的每一步.有效的护理措施直接影响检查结果的准确性,熟练的护理操作及耐心细致的心理护理是MSCTU检查中的重要环节.%Objective To discuss the value of nursing work in 64-slice CT urography. Methods 240 patients participated in the 64-slice CT urography, inquiring medical history and iodine allergic history, paying attention to their psychological state and finishing iodine preliminary test before examination, ob-serving patients carefully, pre-judging any possible adverse effect and formulating corresponding measures during the examination, giving expectant treatment according to the various condition and nursing instruc-tion. Results 239 patients passed through the examination smoothly, agents exosmosis happened in one case and led to failure, but satisfactory image was obtained after rescanning. Conclusions Nursing oper-ation penetrates every step of 64-slice CT urography, which is a non-traumatic, low-expense and high-safety examination. Effect nursing directly influences the accuracy of the results, proficient nursing opera-tion and patient psychological nursing is the important part of it.

  1. 64层CT对心外膜脂肪组织与冠心病相关性的研究进展%Progress of 64-slice spiral CT study on the relationship between epicar-dial adipose tissue and coronary artery disease

    Institute of Scientific and Technical Information of China (English)

    何彪; 郭庆乐

    2015-01-01

    近年来,越来越多的研究表明,心外膜脂肪组织在结构和功能上对冠心病有着重要的影响,其中CT测量心外膜脂肪组织体积因其准确度高于超声测量心外膜脂肪组织厚度,且成本低、效率高,优于MRI而被广泛应用。早期通过影像学检查方法对心外膜组织进行评估,对避免后续心血管疾病的发生具有一定的临床实践意义。%Recent evidences suggest that,epicardical adipose tissue can mechanically and functionally affect the heart and vascular tissue.The accuracy of epicardical adipose tissue volume measured by CT is higher than epicardical adi-pose tissue thickness measured by cardiac ultrasound,and the low cost,high efficiency is better than that of MRI,there-fore is widely used.It may be important to evaluate the epicardical adipose tissue earlier with examination of imageology to avoid the development of cardiovascular disease.

  2. Effect of Heart Rate and Body Mass Index on the Interscan and Interobserver Variability of Coronary Artery Calcium Scoring at Prospective ECG-Triggered 64-Slice CT

    International Nuclear Information System (INIS)

    To test the effects of heart rate, body mass index (BMI) and noise level on interscan and interobserver variability of coronary artery calcium (CAC) scoring on a prospective electrocardiogram (ECG)-triggered 64-slice CT. One hundred and ten patients (76 patients with CAC) were scanned twice on prospective ECG-triggered scans. The scan parameters included 120 kV, 82 mAs, a 2.5 mm thickness, and an acquisition center at 45% of the RR interval. The interscan and interobserver variability on the CAC scores (Agatston, volume, and mass) was calculated. The factors affecting the variability were determined by plotting it against heart rate, BMI, and noise level (defined as the standard deviation: SD). The estimated effective dose was 1.5 ± 0.2 mSv. The mean heart rate was 63 ± 12 bpm (range, 44-101 bpm). The patient BMIs were 24.5 ± 4.5 kg/m2 (range, 15.5-42.3 kg/m2). The mean and median interscan variabilities were 11% and 6%, respectively by volume, and 11% and 6%, respectively, by mass. Moreover, the mean and median of the algorithms were lower than the Agatston algorithm (16% and 9%, respectively). The mean and median interobserver variability was 10% and 4%, respectively (average of algorithms). The mean noise levels were 15 ± 4 Hounsfield unit (HU) (range, 8-25 HU). The interscan and interobserver variability was not correlated with heart rate, BMI, or noise level. The interscan and interobserver variability of CAC on a prospective ECG-triggered 64-slice CT with high image quality and 45% of RR acquisition is not significantly affected by heart rate, BMI, or noise level. The volume or mass algorithms show reduced interscan variability compared to the Agatston scoring (p < 0.05).

  3. Imaging of Herniated Discs of the Cervical Spine: Inter-Modality Differences between 64-Slice Multidetector CT and 1.5-T MRI

    Energy Technology Data Exchange (ETDEWEB)

    Yi, Ji Sook; Cha, Jang Gyu [Dept. of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of); Han, Jong Kyu [Dept. of Radiology, Soonchunhyang University Cheonan Hospital, Cheonan (Korea, Republic of); Kim, Hyun Joo [Dept. of Radiology, Soonchunhyang University Seoul Hospital, Seoul (Korea, Republic of)

    2015-08-15

    To assess inter-modality variability when evaluating cervical intervertebral disc herniation using 64-slice multidetector-row computed tomography (MDCT) and magnetic resonance imaging (MRI). Three musculoskeletal radiologists independently reviewed cervical spine 1.5-T MRI and 64-slice MDCT data on C2-3 though C6-7 of 51 patients in the context of intervertebral disc herniation. Interobserver and inter-modality agreements were expressed as unweighted kappa values. Weighted kappa statistics were used to assess the extents of agreement in terms of the number of involved segments (NIS) in disc herniation and epicenter measurements collected using MDCT and MRI. The interobserver agreement rates upon evaluation of disc morphology by the three radiologists were in fair to moderate agreement (k = 0.39-0.53 for MDCT images; k = 0.45-0.56 for MRIs). When the disc morphology was categorized into two and four grades, the inter-modality agreement rates were moderate (k-value, 0.59) and substantial (k-value, 0.66), respectively. The inter-modality agreements for evaluations of the NIS (k-value, 0.78) and the epicenter (k-value, 0.79) were substantial. Also, the interobserver agreements for the NIS (CT; k-value, 0.85 and MRI; k-value, 0.88) and epicenter (CT; k-value, 0.74 and MRI; k-value, 0.70) evaluations by two readers were substantial. MDCT tended to underestimate the extent of herniated disc lesions compared with MRI. Multidetector-row computed tomography and MRI showed a moderate-to-substantial degree of inter-modality agreement for the assessment of herniated cervical discs. MDCT images have a tendency to underestimate the anterior/posterior extent of the herniated disc compared with MRI.

  4. Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom

    Science.gov (United States)

    Hashim, S.; Karim, M. K. A.; Bakar, K. A.; Sabarudin, A.; Chin, A. W.; Saripan, M. I.; Bradley, D. A.

    2016-09-01

    The magnitude of radiation dose in computed tomography (CT) depends on the scan acquisition parameters, investigated herein using an anthropomorphic phantom (RANDO®) and thermoluminescence dosimeters (TLD). Specific interest was in the organ doses resulting from CT thorax examination, the specific k coefficient for effective dose estimation for particular protocols also being determined. For measurement of doses representing five main organs (thyroid, lung, liver, esophagus and skin), TLD-100 (LiF:Mg, Ti) were inserted into selected holes in a phantom slab. Five CT thorax protocols were investigated, one routine (R1) and four that were modified protocols (R2 to R5). Organ doses were ranked from greatest to least, found to lie in the order: thyroid>skin>lung>liver>breast. The greatest dose, for thyroid at 25 mGy, was that in use of R1 while the lowest, at 8.8 mGy, was in breast tissue using R3. Effective dose (E) was estimated using three standard methods: the International Commission on Radiological Protection (ICRP)-103 recommendation (E103), the computational phantom CT-EXPO (E(CTEXPO)) method, and the dose-length product (DLP) based approach. E103 k factors were constant for all protocols, ~8% less than that of the universal k factor. Due to inconsistency in tube potential and pitch factor the k factors from CTEXPO were found to vary between 0.015 and 0.010 for protocols R3 and R5. With considerable variation between scan acquisition parameters and organ doses, optimization of practice is necessary in order to reduce patient organ dose.

  5. Left coronary to right ventricle fistula in a child: management strategy based on cardiac-gated 64-slice CT

    Energy Technology Data Exchange (ETDEWEB)

    Marini, Davide; Agnoletti, Gabriella; Bonnet, Damien [University Rene Descartes-Paris V, Department of Paediatric Cardiology, Hopital Necker-Enfants Malades, AP-HP, Paris (France); Brunelle, Francis; Ou, Phalla [University Rene Descartes-Paris V, Department of Paediatric Radiology, Hopital Necker-Enfants Malades, AP-HP, Paris (France)

    2008-03-15

    Congenital coronary fistulae are a diagnostic challenge. A prerequisite for best management is accurate anatomical evaluation, traditionally provided by invasive catheter angiography. Multislice CT (MSCT) is an emerging noninvasive technique for coronary artery evaluation. We present a 3-year-old boy and highlight the clinical usefulness of new-generation MSCT to study coronary artery fistulae in children. Multiplanar and 3-D reconstruction offer invaluable information to plan the best therapeutic strategy in this setting. We provide evidence for the expanding clinical role of MSCT for coronary artery imaging in children. (orig.)

  6. Validation of a new cardiac image fusion software for three-dimensional integration of myocardial perfusion SPECT and stand-alone 64-slice CT angiography

    International Nuclear Information System (INIS)

    Combining the functional information of SPECT myocardial perfusion imaging (SPECT-MPI) and the morphological information of coronary CT angiography (CTA) may allow easier evaluation of the spatial relationship between coronary stenoses and perfusion defects. The aim of the present study was the validation of a novel software solution for three-dimensional (3D) image fusion of SPECT-MPI and CTA. SPECT-MPI with adenosine stress/rest 99mTc-tetrofosmin was fused with 64-slice CTA in 15 consecutive patients with a single perfusion defect and a single significant coronary artery stenosis (≥50% diameter stenosis). 3D fused SPECT/CT images were analysed by two independent observers with regard to superposition of the stenosed vessel onto the myocardial perfusion defect. Interobserver variability was assessed by recording the X, Y, Z coordinates for the origin of the stenosed coronary artery and the centre of the perfusion defect and measuring the distance between the two landmarks. SPECT-MPI revealed a fixed defect in seven patients, a reversible defect in five patients and a mixed defect in three patients and CTA documented a significant stenosis in the respective subtending coronary artery. 3D fused SPECT/CT images showed a match of coronary lesion and perfusion defect in each patient and the fusion process took less than 15 min. Interobserver variability was excellent for landmark detection (r = 1.00 and r = 0.99, p < 0.0001) and very good for the 3D distance between the two landmarks (r = 0.94, p < 0.001). 3D SPECT/CT image fusion is feasible, reproducible and allows correct superposition of SPECT segments onto cardiac CT anatomy. (orig.)

  7. 64层螺旋CT血管成像在脊髓血管介入术前评估中的价值%Value of 64-slice spiral computed tomography angiography in preoperative evaluation of spinal vascular intervention

    Institute of Scientific and Technical Information of China (English)

    肖云华; 吕富荣; 吕发金; 孙向前; 彭冈力

    2011-01-01

    目的 探讨64层螺旋CT在脊髓血管介入术前评估中的价值.方法 选择17例胸腰段脊髓损伤患者行脊柱64层螺旋CT增强扫描,重建薄层图像,层厚0.625 mm,间隔0.625 mm,以DICOM格式传输到ADW4.2工作站,采用容积显示(volume rendering,VR)、最大密度投影(maximum intensity projection,MIP)及多平面重建(multi-planar reformat,MPR)等后处理技术进行三维重建,分析脊髓供血动脉的走行特征.结果 17例患者中有16例患者(94%)胸腰段均可见根髓动脉供血脊髓,其中1支(6%)自T4/5左侧椎间孔进入椎管,2支(12%)自T10/11左侧椎间孔进入椎管,1支(6%)自T11/12左侧椎间孔进入椎管,4支(24%)根髓动脉自L1/2左侧椎间孔进入椎管,2支(12%)自L2/3左侧椎间孔进入椎管,2支(12%)自T11/12右侧椎间孔进入椎管,2支(12%)自T12/L1右侧椎间孔进入椎管,2支(12%)自L2/3右侧椎间孔进入椎管,10例(59%)患者根髓动脉自左侧椎间孔进入椎管.另有1例(6%)患者行CT和DSA检查均未发现根髓动脉.结论 64层螺旋CT能准确直观反映脊髓供血动脉的开口位置、走行方向、管径大小及其与周围血管的空间关系,为脊髓血管介入术前提供丰富的评估信息.%Objective To investigate the value of 64-slice spiral computed tomography(CT)angiography in preoperative evaluation of spinal vascular intervention.Methods Seventeen patients with segmental injury of the spinal cord underwent the enhanced 64-slice CT scan of the spine.Thin-slice reconstruction was done,with the slice thickness of 0.625 mm and interval of 0.625 mm.The data were transferred to the work station ADW4.2 in DICM format.Image postprocessing technologies such as volume rendering(VR),maximum intensity projection(MIP)and multi-planar reformat(MPR)were used to conduct three-dimensional reconstruction and analyze the anatomical characteristics of radiculomedullary artery.Results Radiculomedullary artery could be found in the thoracolumbar segment of

  8. Evaluation of morphologic characteristics of the aortic root with 64-slice spiral computed tomography%64层螺旋CT对主动脉根部形态结构的评价

    Institute of Scientific and Technical Information of China (English)

    陈华; 黄新苗; 赵仙先; 曹江; 秦永文

    2011-01-01

    目的 研究主动脉根部及临近组织结构64层螺旋CT(MSCT)成像技术、影像解剖及其临床意义.方法 60例无明显主动脉、主动脉瓣膜疾病患者行MSCT检查,采用多平面重建(MPR)、容积再现(VR)及仿真内镜(VE)等方法重建并测量相关数据.结果 测得主动脉根部直径(22.79±3.31)mm,主动脉窦间距(33.43±3.34)mm,冠脉开口处直径(30.06±2.70) mm,升主动脉内径(30.39±3.42),窦底平面至窦顶平面距离(19.18±2.21) mm.左右冠状动脉开口距主动脉根部距离分别为(15.71±3.53) mm、(15.96±3.78) mm.结论 应用MSCT增强扫描可清楚显示主动脉开口大小、冠脉开口位置、有无发育畸形及与周边结构关系,为带瓣膜支架的设计与经皮主动脉瓣膜植入手术顺利施行提供影像学依据.%Objective To explore the imaging technique for demonstrating the aortic root and its neighbouring structures with 64-slice spiral computed tomography, and to discuss the morphologic characteristics of the aortic root as well as their clinical signif'icance. Methods Multislice spiral CT scanning was performed in sixty adult patients who had no obvious ascending aorta diseases or aortic valve abnormalities. Multi-plane reconstruction (MPR) . volume rendering (VR)and virtual endoscopy (VE)were employed to demonstrate the anatomy of the aortic root, while the relevant data concerning the aorta and coronary smus were also determined. The results were analyzed. Results The mean aortic diameter at aortic root was(22.79 ± 3.3l)mm. the mean distance between coronary sinuses was (33.43 ± 3.34) mm, and the mean coronary diameter at its orifice was (30.06 ± 2.70) mm. The measurements also included the inner diameter of middle ascending aorta(30.39 ± 3.42) mm , the distance between the bottom plane and top plane of the coronary sinus(19.18 ± 2.21) mm, the distance between left coronary orifice and aortic root( 15.71 ± 3.53) mm and the distance between right coronary

  9. Low-dose ECG-gated 64-slices helical CT angiography of the chest: evaluation of image quality in 105 patients

    Energy Technology Data Exchange (ETDEWEB)

    D' Agostino, A.G.; Remy-Jardin, M.; Khalil, C.; Remy, J. [University Center of Lille, Department of Thoracic Imaging, Hospital Calmette, Lille (France); Delannoy-Deken, V.; Duhamel, A. [University of Lille, Department of Medical Statistics, Lille (France); Flohr, T. [Siemens Medical, Research and Development Department, CT Division, Forchheim (Germany)

    2006-10-15

    interpolation artefacts was significantly linked to a low heart rate in affected patients. The overall image quality of CT scans was rated as diagnostic in 94 patients (89.5%) while 11 examinations (10.5%) were found to be partially nondiagnostic owing to the cyclic presence of severe interpolation artefacts, which can be compensated for by additional reconstructions at a different temporal window. In these cases, interpolation artefacts could have been avoided by reducing the pitch from 0.3 to 0.2 at the expense of increased patient dose. Low-dose ECG-gated CT angiograms of the chest can be obtained in routine clinical practice with 64-slice CT technology without altering the diagnostic value of CT scans. (orig.)

  10. 64-slice spiral computed tomography of the coronary arteries: dose reduction using an optimized imaging protocol including individual weight-adaptation of voltage and current-time product

    International Nuclear Information System (INIS)

    Radiation dose and image quality were compared between a standard protocol (40 patients, group A) and a weight-adapted protocol of voltage and current-time product (44 patients, group B) using 64-slice coronary multidetector computed tomography (MDCT). Effective dose estimate was lower by 37% in all patients of group B (9.2±2.5 mSv) compared with group A (14.6±2.3 mSv, P<0.0001). Group B patients with a small body mass index (BMI) benefited most with a dose reduction of 53% (6.7±1.5 mSv in group B versus 14.1±1.8 mSv in group A, P < 0.0001). Moderate reductions of 32% and 20% were achieved for patients with a medium and large BMI, respectively. Reduction in radiation dose did not affect the image quality as assessed by image noise, signal-to-noise ratios, and number of coronary segments with good diagnostic image quality. Individual weight-adaptation of voltage and current-time product significantly reduces the radiation dose without loss of image quality. (orig.)

  11. Evaluation of coronary calcifications with 64-slice CT - variability of the scores and the influence of the reconstruction interval; Bestimmung des koronaren Kalzium-Scores mittels 64-Zeilen-CT - Variabilitaet der Scores und Einfluss des Rekonstruktionszeitpunktes

    Energy Technology Data Exchange (ETDEWEB)

    Weininger, M.; Ritter, C.O.; Beer, M.; Hahn, D.; Beissert, M. [Inst. fuer Roentgendiagnostik, Universitaetsklinikum Wuerzburg (Germany)

    2007-09-15

    Purpose: To evaluate the variability of coronary calcium scores depending on the image reconstruction interval using a 64-slice CT scanner. Materials and Methods: 30 patients (18 male, 12 female; mean age 57 {+-} 9 yrs; mean heart rate 66 {+-} 10 bpm) underwent coronary calcium scoring using a 64-slice CT scanner (Somatom Sensation 64, Siemens Medical Solutions, Erlangen) and a standardized scanning protocol. Oral {beta}-blockers were administered to 12 patients with a baseline heart rate > 70 bpm. Images were reconstructed in 10 % increments from 10 - 100 % of the RR interval. Two blinded experienced observers independently calculated Agatston (AS), calcium mass (MS) and volume scores (VS) for every reconstructed image series. The results were compared to similar studies for 16-slice CT scanners. Results: The mean values and mean coefficients of variation among all patients were as follows: AS, 397 {+-} 829, 109 % MS, 88 {+-} 225, 154 % VS, 335 {+-} 669, 100 %. Regarding the reconstruction intervals, the mean coefficients of variation were as follows: 107 % (AS), 97 % (VS), 116 % (MS). No specific image reconstruction interval with statistically significant lower variability for each score could be identified. High inter-observer agreement was achieved (K = 0.98). With statistical significance (p < 0.05) 10/30 patients (pts) were able to be allocated to more than one risk group (RG): 6 pts = 2 RG; 3 pts = 3 RG; 1 pts = 4 RG. The scores for 5/30 patients were zero for at least one reconstruction interval, but further reconstructions revealed calcifications. The number of patients assignable to different risk groups was significantly lower compared to published data using a 16-slice scanner (p < 0.05). Conclusion: Coronary calcium scores determined using a 64-slice scanner display a wide range of variability depending on the image reconstruction interval as already described for 16-slice CT scanners. However, compared to previous studies, our data indicate that this

  12. Diagnostic value of 64-slice CT examination and multi-planar reconstruction of carpal fractures%64层螺旋CT及多平面重建对腕骨骨折的诊断价值

    Institute of Scientific and Technical Information of China (English)

    王聚宝; 奚甘平; 张建福

    2014-01-01

    To investigate the value of 64-slice CT examination and multi -planar reconstruction technique in the diagno-sis of carpal fractures .Methods:A retrospective analysis of 31 patients imaging data with carpal fracture diagnosed by 64-slice CT exam-ination and multi-planar reconstruction , by comparing with conventional X -ray radiography examination .Results:31 patients in routine X-ray examination revealed 19 carpal fractures , CT and multi-planar reconstruction examination revealed 39 .There was significant difference ( P <0.05) for carpal fracture detection between the two examination .Conclusion:Compared to the conventional X -ray ex-amination, the 64-slice CT examination and multi -planar reconstruction might have important clinical significance in the diagnosis of carpal fractures .%目的:探讨64层螺旋CT及多平面重建技术在腕骨骨折诊断中的价值。方法:回顾分析31例经64层螺旋CT及多平面重建检查确诊腕骨骨折患者的影像学资料,并与常规X线摄影检查结果相对比。结果:31例患者中常规X线检查发现腕骨骨折19处,CT及多平面重建检查发现39处。两者对腕骨骨折的检出有明显差别(P<0.05)。结论:与常规X线检查相比较,64层螺旋CT及多平面重建对确诊腕骨骨折及骨折部位、类型的显示有重要的临床价值。

  13. Diagnostic Value of 64-Slice Dual-Source CT Coronary Angiography in Patients with Atrial Fibrillation: Comparison with Invasive Coronary Angiography

    International Nuclear Information System (INIS)

    We wanted to evaluate the image quality and diagnostic value of 64-slice dual-source computed tomography (DSCT) coronary angiography in patients with atrial fibrillation (Afib). The coronary arteries of 22 Afib patients seen on DSCT were classified into 15 segments and the imaging quality (excellent, good, moderate and poor) and significant stenoses (≥ 50%) were evaluated by two radiologists who were blinded to the conventional coronary angiography (CAG) results. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for detecting important coronary artery stenosis were calculated. McNemar test was used to determine any significant difference between DSCT and CAG, and Cohen's Kappa statistics were calculated for the intermodality and interobserver agreement. The mean heart rate was 89 ± 8.3 bpm (range: 80-118 bpm). A range from 250 msec to 300 msec within the RR interval was the optimal reconstruction interval for the patients with Afib. The respective overall sensitivity, specificity, PPV and NPV values were 74%, 97%, 81% and 96% for reader 1 and 72%, 98%, 85% and 96% for reader 2. No significant difference between DSCT and CAG was found for detecting a significant stenosis (reader 1, p = 1.0; reader 2, p = 0.727). Cohen's Kappa statistics demonstrated good intermodality and interobserver agreement. 64-slice DSCT coronary angiography provides good image quality in patients with atrial fibrillation without the need for controlling the heart rate. DSCT can be used for ruling out significant stenosis in patients with atrial fibrillation with its high NPV for detecting in important stenosis.

  14. Diagnostic Value of 64-Slice Dual-Source CT Coronary Angiography in Patients with Atrial Fibrillation: Comparison with Invasive Coronary Angiography

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Jian Jun; Liu, Tie; Feng, Yue; Wu, Wei Feng; Mou, Cai Yun; Zhai, Li Hao [Zhejiang Hospital, Hangzhou (China)

    2011-08-15

    We wanted to evaluate the image quality and diagnostic value of 64-slice dual-source computed tomography (DSCT) coronary angiography in patients with atrial fibrillation (Afib). The coronary arteries of 22 Afib patients seen on DSCT were classified into 15 segments and the imaging quality (excellent, good, moderate and poor) and significant stenoses ({>=} 50%) were evaluated by two radiologists who were blinded to the conventional coronary angiography (CAG) results. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for detecting important coronary artery stenosis were calculated. McNemar test was used to determine any significant difference between DSCT and CAG, and Cohen's Kappa statistics were calculated for the intermodality and interobserver agreement. The mean heart rate was 89 {+-} 8.3 bpm (range: 80-118 bpm). A range from 250 msec to 300 msec within the RR interval was the optimal reconstruction interval for the patients with Afib. The respective overall sensitivity, specificity, PPV and NPV values were 74%, 97%, 81% and 96% for reader 1 and 72%, 98%, 85% and 96% for reader 2. No significant difference between DSCT and CAG was found for detecting a significant stenosis (reader 1, p = 1.0; reader 2, p = 0.727). Cohen's Kappa statistics demonstrated good intermodality and interobserver agreement. 64-slice DSCT coronary angiography provides good image quality in patients with atrial fibrillation without the need for controlling the heart rate. DSCT can be used for ruling out significant stenosis in patients with atrial fibrillation with its high NPV for detecting in important stenosis.

  15. Infant Cardiac CT Angiography with 64-Slice and 256-Slice CT: Comparison of Radiation Dose and Image Quality Using a Pediatric Phantom

    OpenAIRE

    Lee, Yi-Wei; Yang, Ching-Ching; Mok, Greta S. P.; Wu, Tung-Hsin

    2012-01-01

    Background The aims of this study were to investigate the image quality and radiation exposure of pediatric protocols for cardiac CT angiography (CTA) in infants under one year of age. Methodology/Principal Findings Cardiac CTA examinations were performed using an anthropomorphic phantom representing a 1-year-old child scanned with non-electrocardiogram-gated (NG), retrospectively electrocardiogram-gated helical (RGH) and prospectively electrocardiogram-gated axial (PGA) techniques in 64-slic...

  16. 64-slice Computed Tomography Assessment of Coronary Artery Stents: a Phantom Study

    Energy Technology Data Exchange (ETDEWEB)

    Mahnken, A.H.; Muehlenbruch, G.; Seyfarth, T.; Flohr, T.; Stanzel, S.; Wildberger, J.E.; Guenther, R.W.; Kuettner, A. [Aachen Univ. of Technology (Germany). Dept. of Diagnostic Radiology

    2006-02-15

    Purpose: To compare the use of a new 64-slice computed tomography (CT) scanner with 16-slice CT in the visualization of coronary artery stent lumen. Material and Methods: Eight different coronary artery stents, each with a diameter of 3 mm, were placed in a static chest phantom. The phantom was positioned in the CT gantry at an angle of 0 deg and 45 deg towards the z-axis and examined with both a 64-slice and a 16-slice CT scanner. Effective slice thickness was 0.6 mm with 64-slice CT and 1 mm with 16-slice CT. A reconstruction increment of 0.3 mm was applied in both scanners. Image quality was assessed visually using a 5-point grading scale. Stent diameters were measured and compared using paired Wilcoxon tests. Results: Artificial lumen reduction was significantly less with 64-slice than with 16-slice CT. Average visible stent lumen was 53.4% using 64-slice CT and 47.5% with 16-slice MSCT. Most severe artifacts were seen in stents with radiopaque markers. Using 64-slice CT, image noise increased by approximately 30% due to thinner slice thickness. Conclusion: Improved spatial resolution of 64-slice CT resulted in superior assessment of coronary artery stent lumen compared to 16-slice CT. However, a relevant part of the stent lumen is still not assessable with multi-slice CT.

  17. 精益六西格玛法对64排CT检查流程的优化研究%Optimizing Study of 64 Slices CT Examination Workflow with Lean Six Sigma

    Institute of Scientific and Technical Information of China (English)

    郝光远; 陈军; 魏从全; 许诗丽; 王丽; 刘文婷; 孔雀

    2012-01-01

    Objective: To study the process of 64-slices detectors CT examination in patients by the implement of Lean Six Sigma methods: In order to reduce the patients' invalid waiting time so as to raise the patient's flux. Methods Five-step method in Lean Six Sigma management system was performed and implemented. According to such segments as the time of registration, waiting for CT examination, CT examination, films printing, films collecting, CT image interpretation, taking diagnostic report, 160 patients were randomly selected to analyze the times of each segment to find the key factor of resulting in extending the whole CT examination time. Refining methods to aim directly at the factors of resulting in the whole CT examination time were prolonged were proposed to improve the conventional CT examination process. And these methods were retained to be modified and optimized to increase the performed CT scan's patients in each segment. Then, another 160 patients were randomly selected to be compared with the fore 160 patients for the total time of CT examination after the refining methods were performed. Results: The average invalid waiting time of the patients were dropped from 88.50 min to 52.30 rain with statistically difference (P〈 0.01). The Six Sigma value (Z value) was increased from -0.54 to 5.12. Conclusion: The implementing of Lean Six Sigma in the 64-slices CT examination process can shorten the patient's invalid waiting time significantly and improve the patient's flux of single 64-slices CT scanner in each work-day.%目的:运用精益六西格玛方法研究64排CT检查流程,减少患者无效等待时间,提高单台64排CT检查患者的流通量。方法:运用和实施精益六西格玛管理体系5步法,按登记时间、检查前时间、检查时间、打印时间、收片时间、报告时间、取片时间,随机抽取160名患者分析其各阶段时间,找出致患者侯检时间延长的关键因素;对传统检查流程中导致等

  18. 肺不典型腺瘤样增生64层容积 CT 表现与鉴别诊断%Pulmonary atypical adenomatous hyperplasia:64-slice volume CT findings and differential diagnosis

    Institute of Scientific and Technical Information of China (English)

    孙贞超; 李家德

    2014-01-01

    Objective To investigate the 64-slice volume CT findings and differential diagnosis of the pulmo-nary atypical adenomatous hyperplasia ( AAH) .Methods The data of 64-slice volume CT image of 12 cases of patho-logically confirmed pulmonary AAH was made retrospectively .The CT data were compared with those of the 76 cases of localized ground-glass opacity(GGO) in terms of the lesion location ,size,shape,edge signs,internal structure and relationship to adjacent structures .Results Pure ground-glass density nodules were commonly seen in AAH group , pure ground-glass density and mixed-density nodules were seen in benign group , and mixed-density nodules account for the majority in malignant group .There were statistical differences between AAH group and benign or mglignant GGO group in the aspects of lobulation sign,spicular sign,pleural indentation sign and vascular convergence sign (P0.05 ) .Conclusion Pure ground-glass density nodules are the main constituent seen in AAH group .The nodules′diameter were commonly less than 10mm.And no lobulation sign,spicular sign,pleural indentation sign or vascular convergence sign can be seen in the AAH group .It can do help in differential diagnosis analyzing the CT value of the solid component .However,only the histopathology result is the real and the last diagnosis .%目的:探讨肺不典型腺瘤样增生( AAH)的64排容积CT表现及其鉴别诊断。方法回顾性分析经手术病理确诊的AAH 12例64排容积CT影像资料,与同期确诊的76例局限性磨玻璃密度结节( GGO)患者的CT资料对比,对病灶的部位、大小、形态、边缘征象、内部结构和邻近结构关系进行评价。结果 AAH以纯GGO多见,GGO良性组纯磨玻璃密度结节和混合密度结节均可见,GGO恶性组以混合密度结节为主,分叶征、毛刺征、胸膜凹陷征及血管集束征AAH与良、恶性GGO间比较差异均有统计学意义( P<0.05),空泡征、细支气管充气

  19. Study of Relationship Between 64-slice CT Features and Chronic Rhino Sinusitis in Children with Adenoid Hypertrophy%儿童腺样体肥大的CT表现与慢性鼻-鼻窦炎的关系

    Institute of Scientific and Technical Information of China (English)

    王乐秋; 张瑞迪; 隋萍萍; 马秀凤; 李丽娟

    2013-01-01

    Objective To study the relationship between 64-slice CT features and chronic rhino sinusitis in children with adenoid hypertrophy. Methods The noses of 125 children with adenoid hypertrophy were scanned by 64-slice CT. The relationship between incidence of chronic rhino sinusitis and the volume of adenoid measured by CT was analyzed statistically. Results Mild adenoid hypertrophy (A/N 0.05). While the moderate or severe hypertrophy is (A/N ≥ 0.61) more likely to cause chronic rhino sinusitis. There is positive correlation between the hypertrophy degree and the incidence of chronic rhino sinusitis(P<0.05). Conclusion The CT features of adenoid hypertrophy is closely related to chronic rhino sinusitis. It is of great significance to treat adenoid hypertrophy timely for the prevention of chronic rhino sinusitis.%目的 探讨腺样体肥大儿童中慢性鼻-鼻窦炎发病情况与其CT表现的关系.方法 对125例腺样体肥大的儿童行常规鼻部64排CT检查,统计分析慢性鼻-鼻窦炎的发生率与CT测量腺样体体积的关系.结果 腺样体轻度肥大(A/N<0.6)与慢性鼻-鼻窦炎发病与否无关(P >0.05).腺样体中重度肥大(A/N≥0.61)的患儿更易合并慢性鼻-鼻窦炎,且呈正相关关系(P <0.05).即随着腺样体肥大程度的增加,慢性鼻-鼻窦炎发病率亦增加.结论 儿童腺样体肥大CT表现与慢性鼻-鼻窦炎密切相关,及时治疗腺样体肥大对预防及治疗慢性鼻-鼻窦炎具有十分重要的意义.

  20. Comparison of findings of spontaneous splenorenal shunt in color Doppler sonography with multislice CT scan (64 slices) in liver transplant candidates

    International Nuclear Information System (INIS)

    Background: Liver transplantation is the only definite treatment for end stage liver disease and it has high costs for the medical system so decreasing its complication and increasing its effectiveness is crucial. One of the factors that affect liver transplantation is the presence of spontaneous splenorenal shunt. Its diagnosis is mainly overlooked in pre-liver transplant patients. Main modality for its diagnosis is multislice CT scan however this is more expensive than sonography. Also, it exposes the patients to ionizing radiation. Considering the advantages of color Doppler ultrasound, studies to determine the sensitivity and specificity for detection of spontaneous splenorenal shunt is essential. Materials and methods: In our study 70 cirrhotic patients who were referred by liver transplant surgeons for evaluation of abdomen by CT and sonograhy were assessed for presence of spontaneous splenorenal shunt, left adrenal varix and left renal vein diameter and velocity and sensitivity and specificity of both modalities were checked. Patients in whom left renal vein could not evaluated by sonography and patients with splenectomy and nutcracker syndrome were excluded. Results: In the point of 10 mm diameter of left renal vein in CT scan there was 78.6% sensitivity and 67.9% specificity for the presence of spontaneous splenorenal shunt. Left adrenal varix in CT had sensitivity of 71.4%, specificity of 100%, and positive predictive value of 100% and negative predictive value of 70% and varix below spleen in CT had sensitivity of 54.8%, specificity of 96.4%, and positive predictive value of 95.8% and negative predictive value of 58.7% for the presence of spontaneous splenorenal shunt. In the point of 8 mm diameter of left renal vein in sonography there was 66.7% sensitivity and 85.7% specificity for the presence of spontaneous splenorenal shunt. For the velocity of more than 35 cm/s of left renal vein in sonography there was 61.9% sensitivity and 82.1% specificity for

  1. Comparison of findings of spontaneous splenorenal shunt in color Doppler sonography with multislice CT scan (64 slices) in liver transplant candidates

    Energy Technology Data Exchange (ETDEWEB)

    Bagheri, Mohammadhadi, E-mail: Bagherimh@gmail.com [Department of Radiology, Shiraz University of Medical Sciences, Namazi Hospital, Shiraz (Iran, Islamic Republic of); Hajati, Azadeh, E-mail: azadeh.hajati@gmail.com [Department of Radiology, Shiraz University of Medical Sciences, Namazi Hospital, Shiraz (Iran, Islamic Republic of); Hosseini, Mohammadkazem, E-mail: hosseiniaslm@sums.ac.ir [Department of Radiology, Shiraz University of Medical Sciences, Namazi Hospital, Shiraz (Iran, Islamic Republic of); Ostad, Seyed Pouria, E-mail: Pouria.Ostad@gmail.com [Department of Radiology, Shiraz University of Medical Sciences, Namazi Hospital, Shiraz (Iran, Islamic Republic of)

    2012-09-15

    Background: Liver transplantation is the only definite treatment for end stage liver disease and it has high costs for the medical system so decreasing its complication and increasing its effectiveness is crucial. One of the factors that affect liver transplantation is the presence of spontaneous splenorenal shunt. Its diagnosis is mainly overlooked in pre-liver transplant patients. Main modality for its diagnosis is multislice CT scan however this is more expensive than sonography. Also, it exposes the patients to ionizing radiation. Considering the advantages of color Doppler ultrasound, studies to determine the sensitivity and specificity for detection of spontaneous splenorenal shunt is essential. Materials and methods: In our study 70 cirrhotic patients who were referred by liver transplant surgeons for evaluation of abdomen by CT and sonograhy were assessed for presence of spontaneous splenorenal shunt, left adrenal varix and left renal vein diameter and velocity and sensitivity and specificity of both modalities were checked. Patients in whom left renal vein could not evaluated by sonography and patients with splenectomy and nutcracker syndrome were excluded. Results: In the point of 10 mm diameter of left renal vein in CT scan there was 78.6% sensitivity and 67.9% specificity for the presence of spontaneous splenorenal shunt. Left adrenal varix in CT had sensitivity of 71.4%, specificity of 100%, and positive predictive value of 100% and negative predictive value of 70% and varix below spleen in CT had sensitivity of 54.8%, specificity of 96.4%, and positive predictive value of 95.8% and negative predictive value of 58.7% for the presence of spontaneous splenorenal shunt. In the point of 8 mm diameter of left renal vein in sonography there was 66.7% sensitivity and 85.7% specificity for the presence of spontaneous splenorenal shunt. For the velocity of more than 35 cm/s of left renal vein in sonography there was 61.9% sensitivity and 82.1% specificity for

  2. Diagnostic Value of 64-slice CT Perfusion Imaging in Prostate Cancer and Benign Prostatic Hyperplasia%64排CT灌注成像对前列腺癌与良性前列腺增生的诊断价值

    Institute of Scientific and Technical Information of China (English)

    常泰; 戴娜

    2011-01-01

    [目的]探讨前列腺64排CT灌注成像的可行性及对前列腺癌与良性前列腺增生(BPH)的诊断价值.[方法]选择经手术或穿刺病理证实的前列腺癌患者28例(A组)和BPH患者35例(B组),所有患者均行前列腺64排CT灌注扫描,比较两组灌注参数:血流量 (BF)、血容量(BV)、峰值(PE)、达峰时间(TTP)、表面通透性(PS).[结果]A组BF、BV、PE分别为(0.492±0.115) mL/(100 g·min),(0.146±0.019) mL/100 g,(33.4±5.1) HU均显著小于BPH组(1.712±0.095) mL/(100 g·min),(0.276±0.031) mL/100 g,(56.7±6.7) HU(P<0.05),TTP、PS分别为(54.2±5.6)S和(54.8±6.9)mL/(100 g·min)均显著大于BPH组(26.4±4.6)S和(20.1±4.8)mL/(100 g·min) (P<0.05).[结论]前列腺64排CT灌注成像方法可行,灌注数据获得简单快捷,能够在一定程度上反映出前列腺血流灌注变化;前列腺64排CT灌注成像能定量地提供前列腺血流信息,可无创性地辅助诊断前列腺癌和BPH.%[Objective] To explore the feasibility and diagnostic value of 64-clice CT perfusion imaging in prostate cancer(PC) and benign prostatic hyperplasia(BPH). [Methods] Twenty-eight PC patients (group A) and thirty-five BPH patients (group B) confirmed by surgery or pathology were selected. All patients were performed by 64-slice CT perfusion of prostate. The perfusion parameters such as blood flow(BF) , blood volume (BV) , peak enhancement (PE) , time to peak (TTP) and permeability surface(PS) were compared between two groups. [Results] BF, BV and PE in group A were 0. 492 ± 0. 115 mL/(100g · min),(0. 146 ± 0. 019) mL/100g and (33. 4 ± 5. 1)HU respectively, which were significantly lower than those in group B[(1. 712 ± 0.095) mL/(100 g · min),(0. 276 ± 0. 031) mL/100 g and (56. 7 ± 6. 7) HU] ( P <0. 05). TTP and PS in group A were 54. 2 ± 5. 6S and 54. 8 ± 6. 9ml/(100g · min) respectively, which were significantly higher than those in group B[(26. 4 ± 4. 6)s and (20. 1 ± 4. 8) mL/(100g · min)]( P <0. 05

  3. Experimental assessment of the influence of beam hardening filters on image quality and patient dose in volumetric 64-slice X-ray CT scanners

    NARCIS (Netherlands)

    Ay, Mohammad Reza; Mehranian, Abolfazi; Maleki, Asghar; Ghadiri, Hossien; Ghafarian, Pardis; Zaidi, Habib

    2013-01-01

    Beam hardening filters have long been employed in X-ray Computed Tomography (CT) to preferentially absorb soft and low-energy X-rays having no or little contribution to image formation, thus allowing the reduction of patient dose and beam hardening artefacts. In this work, we studied the influence o

  4. 64层螺旋CT对胰腺实性假乳头状瘤的诊断价值%The value of the 64-slice CT for solid-pseudopapillary tumor of pancreas

    Institute of Scientific and Technical Information of China (English)

    龙威

    2012-01-01

    目的:探讨64层螺旋CT对胰腺实性假乳头状瘤(SPTP)的诊断价值,提高对该病的认识.方法:回顾性分析9例经病理证实的SPTP的CT平扫、3期增强扫描及MPR或MIP表现.结果:9例均为女性、单发,边界清楚.5例位于胰头部,2例位于胰体部,2例位于胰尾部.7例呈类圆形,2例呈分叶状.9例均表现为囊实性肿块,1例伴有钙化.3期增强扫描,肿瘤实性成分及包膜呈渐进性强化,囊性部分无强化.结论:64层螺旋CT能准确地反映SPTP影像学特点,具有重要的诊断价值.%Objective: To study the value of the 64-slice CT for Solid-pseudopapillary tumor of pancreas (SPTP)and improve the diagnosis of SPTP. Methods:CT scan, three-phase enhanced scanning performance and MPR or MIP post-processing technology of 9 cases of SPTP proved by pathology were reviewed. Results :9 cases were women ,single tumor and had clear boundaries. 5 cases were in the head or neck of pancreas ,2 cases were in the body of pancreas ,2 cases were in the tail of pancreas ,7 cases were round or oval in shape ,2 cases showed signs of lobulation. 9 cases showed cystic and solid ,1 case had calcified tissues. In three-phase enhanceed scanning , the solid ingredients and envelope were enhanced by filling progressively except cystic part. Conclusion:the 64-slice CT can reflect the SPTP imaging characteristics and it has important diagnostic value.

  5. 64排容积CT后处理技术对输尿管梗阻的诊断%64-slice volume CT post-processing techniques for the diagnosis of ureteral obstruction

    Institute of Scientific and Technical Information of China (English)

    万书友; 侯明杰; 杜灵艳

    2014-01-01

    Objective To investigate the diagnostic value of post-processing technique for ureteral obstruction. Methods All cases were confirmed by surgery or clinical data. 64-slice volume CT (VCT) was performed in 90 cases with ureteral obstruction. The volume data of all patients were reconstructed with 3D reconstruction techniques in-cluding multiple planar reformation (MPR), and volume rendering technique (VR), and curved planar reformation (CPR). Results Among the 90 cases,there were 78 cases of ureteral calculus, 4 ureteral and bladder carcinomas, 2 congenital malformations,and 1 inflammatory stenosis. Conclusion 64-slice VCT and post-processing technique have unique advantage for the etiology and level diagnosis of ureteral obstruction ,which have important significance for clinical treatment programs.%目的:探讨64排螺旋CT后处理技术对输尿管梗阻的诊断价值。方法选取我院2010年6至2013年6月间90例经临床确诊输尿管梗阻病例,所有病例均行64排容积CT扫描并进行多平面重建(multipla-nar reformatting,MPR)、容积重建(volume rendering technique,VR)、曲面重建(curved planar reformation,CPR)等处理。结果90例输尿管梗阻中78例由于输尿管结石所致,邻近器官压迫5例,输尿管癌或膀胱癌4例,先天畸形2例,输尿管炎1例。结论64排容积CT平扫及多种后处理技术对输尿管梗阻病因及定位诊断具有很高的临床应用价值,对临床治疗方案的选择具有重要指导意义。

  6. 64排CT血管造影在动脉瘤性蛛网膜下腔出血的临床研究%Clinical research of 64-slice CT angiography in aneurysmal subarachnoid hemorrhage

    Institute of Scientific and Technical Information of China (English)

    陈立朝; 许民辉; 邹咏文; 杨东虹; 张云东; 徐伦山; 张溢华

    2011-01-01

    目的:评估CT血管造影(CTA)在动脉瘤性蛛网膜下腔出血(SAH)病人中选择治疗策略的作用.方法:对231例动脉瘤性SAH病人行64排CTA检查.选择临床治疗方案,并通过DSA或外科手术验证CTA检查的准确性.结果:CTA检查与DSA或术中探查一致228例,CTA信息不充分2例,CTA漏诊1例;CTA检查的敏感性98.7%,特异性100%.根据CTA检查确定治疗方案228例(98.7%),其中采用血管内栓塞治疗141例,夹闭术87例;根据DSA检查,采用血管内栓塞治疗3例.结论:64排CTA能准确检测颅内动脉瘤及其特征,有助于选择治疗策略.%Objective To evaluate the clinical application of CT angiography (CTA) in making therapeutic strategy for patients with aneurysmal subarachnoid hemorrhage (SAH). Methods The 64-slice CTA examination was performed in 231 patients with aneurysmal SAH to select appropriate treatment strategies. CTA findings should be confirmed by DSA or surgical exploration. Results CTA findings were coincident with the findings by DSA or surgical exploration in 228 cases, CTA findings were insufficient in 2 cases, and missed diagnosis by CTA in 1 case. The sensitivity of CTA examination was 98.7% and specificity was 100%. The therapeutic measures were decided based on CTA in 228 cases (98.7%), including endovascular treatment in 141 cases, clipping of aneurysm in 87. Endovascular treatment was adopted based on DSA in 3 cases. Conclusions The 64-slice CTA as an accurate tool for detecting intracranial aneurysms is useful to decide therapeutic strategy.

  7. Correlation of 64-slices CT Features with Vascular Endothelial Growth Factor Expression in Brain Astrocytoma%VEGF在脑星形细胞瘤中的表达与64排CT征象的关系

    Institute of Scientific and Technical Information of China (English)

    蔡胜艳; 孙妍; 胡嘉航

    2012-01-01

    目的:探讨脑星形细胞瘤64排CT征象与VEGF表达之间的关系.方法:搜集经手术证实的脑星形细胞瘤30例,分析其CT表现,术后对肿瘤组织标本进行免疫组化染色,分析其VEGF表达的程度与CT征象之间的关系.结果:星形细胞瘤的VEGF表达程度与肿瘤的分级、瘤周水肿的范围及肿瘤的强化程度有相关性.结论:星形细胞瘤的CT表现可以反映VEGF的表达程度,能对临床治疗方案的选择和患者预后的评估起到重要作用.%Objective To study the correlation of 64-slices CT features with vascular endolhelial growth factor(VEGF) expression in brain astrocytoma. Methods CT findings in 30 cases with surgically and pathologically proved astrocytoma were retrospectively analyzed. VEGF was stained with immuno- histochemical technique, and VEGF expression levels were compared with CTfeatures. Results VEGF expression levels were with correlated with pathological grade, the extent of per tumor edema and the degree of contrast enhancement. Conclusion CT features of astrocytoma can reflect VEGF expression levels. It is important for the choice of clinical treatment and prognostic evaluation of patients. [Chinese Medical Equipment Journal,2012,33(6):67-68

  8. Spiral CT of Non-Graft Post Cardiac Surgery Complications: A Pictorial Essay

    Directory of Open Access Journals (Sweden)

    S. Shirani

    2010-06-01

    Full Text Available Spiral CT is a rapidly growing method for noninvasive visualization of post-operative complications, including post-operative complications in CABG (coronary artery bypass graft. In the recent years, several different, yet more efficient types have been introduced with progressive improvement in the diagnostic accuracy in the detection of post-operative complications. The introduction of 64-slice technology, which allows high resolution as well as reconstructed images, has resulted in further progress in the diagnostic process. This kind of diagnostic equipment will spread rapidly in the world. Although studies with large numbers of patients regarding spiral CT as a routine diagnostic method have not been reported, there is great need for it all over the world. In this article, we intend to review the spiral CT findings of non-graft complications in patients after cardiac surgery.

  9. Contrast-enhanced 64-slice computed tomography in detection and evaluation of anomalous coronary arteries

    International Nuclear Information System (INIS)

    Anomalous coronary artery (ACA) has either an unusual origin or different anatomical course and is associated with sudden cardiac death. The absence or nonspecific symptoms of ACA make its diagnosis difficult. Mostly, ACA is diagnosed coincidentally during invasive coronary angiogram (ICA). A conventional computed tomography (CT) cannot provide detailed images of coronary arteries of the moving heart, but 64-slice CT, with its short acquisition time, can provide detailed anatomy of coronary arteries non-invasively. In this study, we assessed the validity of contrast-enhanced 64-slice CT in the evaluation of ACA. ICA was performed in 7,574 patients for the diagnosis or evaluation of occlusive coronary artery disease and detected coronary anomalies in 56 patients (0.7%). We then performed 64-slice CT in 53 patients out of the 56 patients with demonstrated or suspected coronary anomaly, showing the origin and the course of the ACA along with stenosis, except for one patient who could not be evaluated due to image distortion artifacts. Contrast-enhanced 64-slice CT was also performed in 374 patients with vague signs and symptoms, detecting coronary anomalies in 7 patients (1.2%). Thus, in the total of 59 patients undergone 64-slice CT, we were able to visualize the entire abnormal coronary tree with a high diagnostic image quality. This is the first study to demonstrate the utility of 64-slice CT in a large series of ACA. Contrast-enhanced 64-slice CT is superior to ICA to identify the presence and course of ACA and should be the first line diagnostic tool in the evaluation of ACA. (author)

  10. 64层CT脑灌注联合CTA在早期缺血性脑血管病中的应用%Application of perfusion and CTA by 64 slice CT in early ischemia cerebral infarction

    Institute of Scientific and Technical Information of China (English)

    李培秀; 都日娜; 丁俊丽; 张强

    2011-01-01

    目的 探讨64层螺旋CT脑灌注加CT血管成像技术在早期脑梗死的应用价值.方法 分析总结108例发病在6h内临床可疑脑梗死,其中105例进行CT平扫、CT脑灌注和CTA,部分复查CTP的住院患者资料,并对影像资料做统计学分析.结果 CT平扫7例脑实质密度轻微减低、脑沟变浅(6.6%),CT脑灌注83例显示与临床症状对应区域血流灌注异常(79.1%),与对侧比较CBF下降、CBV下降或正常、TTP延长.22例CT灌注未见异常(20.9%).CT血管成像显示53支动脉(39例)有不同密度斑块及管腔狭窄,3例检查未成功.结论 CT脑灌注加CTA成像技术可以快速、准确确定缺血半暗带及病变血管,对早期缺血性脑血管脑的诊断和指导治疗有重要的临床应用价值.%Objective To discuss the application of cerebral perfusion and CT blood vessel imaging technique by 64-slice CT in diagnosis of cerebral infarction in its early phase. Methods To analyze and summarize the data of 108 patients who were suspected of the ischemic infarction in 6 hours. 105 among the patients were examined by CT scanning, CT perfusion and CTA. Some of those patients needed the examination by CTP again. All data were analyzed statistically. Results CT scanning showed a slight reduction in the density of brain parenchyma in 7 cases, with brain shallow groove(6. 6%) and CT perfusion showed blood perfusion abnormal corresponding to clinical symptom region in 83 cases (79. 1%). Compared with the contra-lateral, CBF were decreased and CBV were decreased or normal while TTP was extend. 22 cases of CT perfusion showed regular!20. 9%). CT blood vessel imaging showed that 53 arteries of 39 patients had spots and the pipes were narrow. 3 cases were not successful. Conclusion Cerebral perfusion and CTA imaging technique by CT can quickly and exactly definite ischemia and pathology blood vessel, which is of great clinical importance for diagnosing and curing brain ischemia in its early phase.

  11. Using the 64-slice Perfusion CT to Evaluate the Oxygen Tension(pO2) in the Rabbit VX2 Tumor Model: An Experimental Study%64层灌注CT评价兔VX2体部肿瘤模型氧分压的实验研究

    Institute of Scientific and Technical Information of China (English)

    孙昌进; 肖明勇; 阴俊; 于金明; 郞锦义; 王光辉; 李超; 李涛; 罗云秀; 吕海波; 张德康; 李彦; 黄建鸣

    2013-01-01

    Objective: To investigate the role of the 64-slice perfusion CT in the evaluation of the oxygen tension ( pO2 ) in the rabbit VX2 tumor model. Methods: Forty-five rabbit VX2 brain tumor model established successfully were examined with 64-detector row CT. Tumor specimens were assessed for the oxygen tension ( pO2 ) , perfusion, blood volume ( BV) , peak enhancement intensity ( PEI) and time to peak (TTP) , and Pearson correlation coefficients were conducted to represent the relationships between the perfusion parameters and pO2 of the tumor. pO2was measured by oxygen-sensitive electrodes guided by perfusion CT images. Results: Mean values for perfusion,BV,PEI, TTP and pO2 of the 45 tumors were 27. 102 ± 26. 723ml/min, 22. 1 96 ± 13. 680ml/100g,43. 456 ±28.73 HU, 38.823 ±14.759 sec,and 15.981 ± 14.815mmHg, respectively. BV,PEI, TTP were not significant correlated with pO2 (r =0.271, 0. 253 、- 0. 18 , P > 0. 05 ) , whereas positively correlation was found between perfusion with pO2 ( r = 0. 673, P = 0. 00 ). Conclusion: The perfusion value from 64-slice spiral CT perfusion imaging might to have ability to evaluate the tumor pO2%目的:利用64层灌注CT评价兔VX2肿瘤模型氧分压并与氧微电极法对照.方法:对45只成功建模兔VX2脑瘤模型行灌注CT检查.测量脑瘤兴趣区灌注值(perfusion)、血容量(blood volume,BV)、达峰时间(time to peak TTP)、最大峰值(peak enhancement intensity,PEI).结果与该兴趣区氧微电极法测得氧分压(PO2)对照.结果:45例成功建模兔VX2脑瘤兴趣区灌注值范围为1.3 ml/min~127.0 ml/min,平均为27.102 ml/min±26.723 ml/min;BV为1.2 ml/100g~53.1ml/100g,平均为22.196 ml/100g±13.680ml/100g,PEI为8.7 HU~124.6HU,平均为43.456 HU±28.73 HU; TTP为8.2 sec~62.5 sec,平均为38.823 sec±14.759 sec;对应区域PO2为0.14 mmHg~46.70mmHg,平均为15.981 mmHg±14.815mmHg.灌注值与对应区域PO2相关系数为0.673,有统计学意义(P=0.00).BV

  12. Clinical application analysis of 64-slice CT coronary CTA dynamic volume rendering diagnosis of myocardial bridge & nbsp;of the anterior descending branch%64层螺旋CT冠状动脉CTA动态容积再现辅助诊断前降支心肌桥的临床应用分析

    Institute of Scientific and Technical Information of China (English)

    郝晓光

    2013-01-01

      Objective To explore the clinical value of 64-slice CT coronary CTA dynamic volume rendering images auxiliary diagnosis of myocardial bridge. Methods 96 patients underwent coronary CTA from January 2009 to the end of December 2012, with confirm of coronary angiography, were chosen. CT images are routinely reconstructed in the best phase period and in 0-90% phase period, an interval of 10%. Reconstruction data was sent to the workstation to get the MPR, the CPR, as well as dynamic volume rendering images. Images were analyzed by the two groups of doctors of medical imaging department to determine whether the presence of myocardial bridge of the left anterior descending artery based on static images, both static and dynamic volume images, respectively. Results 96 cases with myocardial bridge of the left anterior descending artery confirmed by coronary angiography, 83 cases were diagnosed by the static CTA image, 93 cases were diagnosed by both static and dynamic volume images. The sensitivity of two groups was 93.75% and 82.29%, specificity 99.68% and 99.57%, respectively. Conclusion The comprehensive analysis of the 64-slice spiral CT coronary CTA static and dynamic volume rendering images can improve the accuracy of the diagnosis of left anterior descending artery myocardial bridge.%  目的探索64层螺旋CT冠状动脉CTA动态容积再现图像辅助诊断心肌桥的临床应用价值。方法选择我院2009年1月-2012年12月行冠状动脉CTA检查并经冠脉造影证实的心肌桥96例,所有CT图像均进行常规best phase期相重建及0-90%、间隔10%的多期相重建,重建后的数据传送至工作站进行MPR、CPR重建以及动态容积再现处理。图像由两组医师分别根据静态图像、静态加动态容积再现图像判断是否存在前降支心肌桥,诊断结果分别统计,并进行统计学分析。结果经冠脉造影证实的前降支心肌桥患者96例中,静态CTA图像诊断肌桥83例,静

  13. 64排螺旋CT检测冠状动脉病变与同型半胱氨酸水平的相关性研究%Correlation between 64-slice spiral computed tomography coronary angiography and homocystein in coronary artery disease

    Institute of Scientific and Technical Information of China (English)

    刘丽; 贺延; 王松涛; 吕俊刚

    2012-01-01

    目的 探讨64排螺旋CT(MSCT)检测冠状动脉病变与同型半胱氨酸水平的相关性.方法 入选研究对象87例,均未接受叶酸和(或)维生素B12等治疗,分为急性冠状动脉综合征(ACS)组33例、稳定型心绞痛(SAP)组29例和正常对照组25例,均行冠状动脉MSCT成像检查,根据CT值进一步将ACS和SAP患者分为易损斑块组26例,混合斑块组19例,钙化斑块组17例;对所有研究对象检测血清同型半胱氨酸(Hcy)浓度.结果 3组间血清Hcy浓度按ACS组(16.44±5.48) μmol/L、SAP组(13.06±5.80) μmol/L、正常对照组(9.94±4.23) μmol/L顺序递减(均P<0.01);易损斑块组和混合斑块组血清Hcy浓度均高于钙化斑块组,为(16.50±5.24) μmol/L、(15.51±6.24) μmol/L vs(11.63±5.21) μmol/L(均P<0.01);ACS组与SAP组斑块构成比不同(x2=7.628,P<0.05);ACS组易损斑块检出率(42.4%)高于SAP组(17.2%),ACS组钙化斑块检出率(18.2%)低于SAP组(48.3%)(均P<0.05);斑块的不同性质与血清Hcy浓度间存在相关关系(rs=0.467,P<0.01).结论 冠状动脉MSCT联合血清Hcy化验检查可作为诊断冠心病并预测其严重程度的无创方法在临床上得以应用.%Objective To explore the correlation between 64-slice spiral computed tomography ( MSCT) coronary angiography and homocystein( Hey) in coronary artery disease. Methods Eighty-seven patients were divided into three groups:coronary artery syndrome (ACS) group 33 cases, stable angina pectoris(SAP) group 29 cases and healthy control group 25 cases. No one had received drug therapy with folic acid and/or vitamin B12. All patients underwent 64-slice spiral computed tomography angiography to distinguish the different quality of coronary plaques. According to the CT scale, all coronary artery disease patients were divided into vulnerable plaque group, mix plaque group and hard plaque group. Blood samples were taken to measure Hey level in all patients. Results Mean Hey level of ACS

  14. Evaluation of Carotid Atherosclerosis Using 64-slice CT Angiography and Contrast enhanced Ultrasound%64层螺旋CT血管造影及超声造影评价颈动脉斑块

    Institute of Scientific and Technical Information of China (English)

    杨晓燕; 胡元明; 魏玮; 胡正明; 游勇

    2012-01-01

    目的 探讨64层螺旋CT血管造影(MSCTA)及超声造影(CEUS)在评价颈动脉斑块中的价值.资料与方法 37例颈动脉斑块狭窄患者于1周内分别行MSCTA及CEUS检查,分析颈动脉内中膜厚度/颈动脉管壁厚度、狭窄比率、斑块表面形态,采用CEUS观察斑块内新生血管情况,将斑块分为内中膜增厚型、稳定型及易损斑块.结果 37例共51处病变血管,MSCTA:颈动脉管壁增厚9处;斑块42处,其中稳定斑块27处,易损斑块15处.CEUS:颈动脉内中膜增厚11处;斑块40处,其中稳定斑块23处,易损斑块17处.MSCTA:轻度狭窄21处,中度狭窄15处,重度狭窄12处,闭塞3处;CEUS:轻度狭窄20处,中度狭窄16处,重度狭窄13处,闭塞2处.MSCTA与CEUS对颈动脉斑块狭窄(Kappa=0.71,P< 0.05)及斑块稳定性(Kappa=0.69,P<0.05)评价一致性较好.结论 MSCTA与CEUS对评价颈动脉斑块狭窄及斑块稳定性具有较好的一致性.%Purpose To explore the value of 64-slice CT angiography (MSCTA) and contrast-enhanced ultrasound (CEUS) in the diagnosis of carotid atherosclerosis. Materials and Methods 37 patients with carotid atherosclerosis underwent MSCTA and CEUS within one week. Intima-media thickness (IMT), carotid artery wall thickness (CAWT), carotid artery percent stenosis and surface morphology of the atherosclerotic plaques were analyzed. The neo-vasculization in the plaques after CEUS were observed, and plaques were further divided into IMT thickening, stable plaque and vulnerable plaque. Results 51 pathological changes of 37 patients were observed. MSCTA showed 9 carotic artery wall thickening and 42 plaques including 27 stable plaques and 15 vulnerable plaques. CEUS showed 11 intima-media thickening and 40 plaques, 23 stable and 16 vulnerable. MSCTA showed 21 mild stenoses, 15 moderate stenoses, 12 severe stenoses, and 3 occlusions; CEUS showed 20 mild stenoses, 16 moderate stenoses, 13 severe stenoses, and 2 occlusions. MSCT and CEUS had good

  15. 64排CT与全景牙片在埋伏牙诊断中的应用%Diagnositic Value of 64-Slice CT and Intraoral Digital Dental Radiography Technique in Embedded Teeth

    Institute of Scientific and Technical Information of China (English)

    陈殿森; 陈望; 滑炎卿

    2011-01-01

    目的:评价64排螺旋CT与口腔全景X线牙片对上颌前部埋伏牙诊断及定位的应用价值.方法:对42例全景X线牙片疑上颌埋伏牙患者行64排螺旋CT扫描,并应用64排螺旋CT图像后处理功能,做三维重建和多层面重建,获取相应牙体的任意平面、任意方位图像.结果:42例患者,38例为上颌前部埋伏牙,25例埋伏牙位于腭侧,9例埋伏牙位于唇侧,4例埋伏牙牙根位于腭侧,而牙冠位于唇侧,经手术证实,符合率100%.结论:多排螺旋CT对儿童上颌埋伏牙能做出精确定位,对上颌埋伏牙诊断及定位的价值优于全景数字X线牙片,可作为上颌埋伏牙临床外科治疗及正畸治疗前的重要检查方法.%Objective: To compare the clinic application of multirow spiral CT (MSCT) and intraoral digital dental radiography technique in location with embedded teeth of children. Methods: Forty-two children suspected for embedded teeth were examined by MSCT and intraoral digital dental radiography technique with multiplanar reformation (MPR) and three dimensional (3D) reconstruction of MSCT. Results: A total of 38 cases of embedded teeth were diagnosed, including 25 embedded teeth located in palate sides, 9 in lip sides, and 4 cases of which the teeth root located in palate sides, and the teeth crown located in lip sides. According to the resluts of surgery, the accurate rate was 100%. Conclusion; Multirow spiral CT can accurately locate embedded teeth of children, and have an obvious advantage over the intraoral digital dental radiography technique in diagnosis and locating of embedded teeth. It is an important method to be applied in examing embedded teeth in upper jaw.

  16. 64排螺旋CT血管造影诊断颅内动脉瘤%DIAGNOSIS OF INTRACRANIAL ANEURYSM WITH 64-SLICE SPIRAL CT ANGIOGRAPHY

    Institute of Scientific and Technical Information of China (English)

    钱惠农; 王有刚; 朱蕴杰; 姜峰

    2009-01-01

    [目的]评估64排螺旋CT血管造影(CTA)在颅内动脉瘤诊断中的作用.[方法]对48例自发性蛛网膜下腔出血(SAH)患者进行CTA检查,同期行数字减影血管造影(DSA),分析比较两种检查的结果.[结果]11例SAH患者其CTA和DSA均未见异常.37例CTA和DSA结果存在异常患者中,CTA发现37个动脉瘤,DSA发现38个(2例多发性动脉瘤),CTA遗漏2个动脉瘤,误诊1个动脉瘤.CTA诊断动脉瘤的灵敏度为94.7%,特异度为91.7%.[结论]64排螺旋CTA是诊断颅内动脉瘤的一种简单、快速、准确的方法,具有极高的临床价值.

  17. 急性胰腺炎64层螺旋CT灌注成像研究%Acute Pancreatitis: 64-slice Spiral CT Perfusion Imaging

    Institute of Scientific and Technical Information of China (English)

    姜海峰; 郭顺林; 周怀琪; 王刚; 张安; 徐风

    2009-01-01

    目的 探讨64层螺旋CT灌注成像在急性胰腺炎诊断中的作用.方法 分别对胰腺正常者30例和急性胰腺炎患者28例行Siemens 64层螺旋CT胰腺灌注检查,采用Siemens Body Perfusion软件测量所有病例的胰头部、胰体尾部的CT灌注参数:血流量(blood flow,BF)、血流容积(blood volume,BV)、灌注起始时间(time to start,TTS)、达峰时间(time to peak,TTP)、渗透性(permeability,P)、patlak血流容积(patlak blood volume,pBV)的平均值, 并进行统计学分析.结果 Siemens灌注软件计算所得时间-密度曲线(density-time curve,TDC)符合数据分析要求.统计数据结果显示急性胰腺炎组胰头部和体尾部的BF、BV、 pBV明显低于正常胰腺组,而其渗透性高于正常胰腺组, 差异均有显著的统计学意义(P0.05);急性胰腺炎组、正常胰腺组各自的胰头部与胰体尾部之间各灌注参数 无统计学意义(P>0.05).结论 64层螺旋CT灌注成像能够反映急性胰腺炎的血流灌注改变,对其临床的早期诊断有重要的指导意义.

  18. 64排螺旋CT血管成像诊断永存三叉动脉%Diagnosis of persistent trigeminal artery with 64-slice spiral CT angiography

    Institute of Scientific and Technical Information of China (English)

    袁飞; 刘银社; 赵军; 谷鹏; 顾欣; 冯凯琳

    2010-01-01

    目的 观察64排螺旋CT血管成像(CTA)在诊断永存三叉动脉(PTA)中的价值,提高对该血管变异的认识.方法 回顾性分析2734例行头颈64排螺旋CTA检查中的5例PTA患者的影像学资料,分析PTA的发生率、起源、走行、后循环供血及合并其他血管畸形的情况.结果 ①PTA的发生率为0.18%(5/2734),其中3例位于右侧,2例位于左侧.②三叉动脉均起自颈内动脉海绵窦段,血管走行外侧型4例,内侧型1例;按Saltzman分型显示PTA后循环供血情况:Ⅰ型1例,Ⅱ型1例,Ⅲ型3例.③吻合点近端的基底动脉及双侧椎动脉发育不良3例,吻合点近端基底动脉完全萎缩1例;合并PTA的动脉瘤1例,合并对侧大脑中动脉成窗1例.结论 64排CTA能清晰、快速、无创、准确地显示PTA及其走行.在鞍区或鞍上区手术及介入治疗前,了解这种异常血管的有助于制定合理的手术和介入治疗方案,避免因操作不当所致的危险.

  19. 起搏器置入患者640层与64层CT冠状动脉造影图像质量和伪影的比较%Comparative Study of Image Quality and the Artifact of Coronary Angiography between 640-slice and 64-slice CT in the Patients with Pacemaker

    Institute of Scientific and Technical Information of China (English)

    王振; 丁忠祥; 王博业; 狄幸波; 袁建华; 徐健; 陈军法; 钟建国

    2012-01-01

    Objective To compare the image quality and artifact between 640 - slice and 64 - slice CT coronary angiography in the patients with pacemaker, and to evaluate the success rate and applicability of CT coronary angiography. Methods Twenty - four patients with pacemaker were divided into two groups. Group A ( 16 patient) underwent 640 - slice CT coronary angiography, and Group B ( 8 patient) underwent 64 - slice CT coronary angiography. Image quality and artifact of the fifteen coronary segments were assessed by two blinded observers. Radiation dosage and patient's common information were recorded. Data sets were analyzed using parametric and nonpara-metric statistical tests with the SPSS 13.0 software. Results There was no significant difference in body weight and body height between the two groups. Radiation exposure was significantly higher with 64 - slice CT than with 640 - slice CT ( 13. 8 ± 1. 53 mSv vs 9. 14 ± S.6S mSv; P<0.001) despite significantly higher heart rates in the 640 - slice CT group [61 ±4bpm ( beats per minute) vs 71 ±6bpm; P <0. 001 ] . The rate of available diagnostic images was greater for images obtained with 640 - slice CT than for images obtained with 64 -slice CT(99.06% vs93.27% ; P<0.05). Artifacts were the cause of coronary arteries that cannot be evaluated for coronary MSCT angiography. They were blurring artifact, stairstep artifact, streak artifact, missing data. There were significant differences in these artifacts between the two groups( continuity corrected^2 = 5.009,/* <0.05). Artifacts of group A were mild (94.3% ) , and artifacts of group B were severe artifacts (31.8% ). Conclusion 640 - slice and 64 - slice CT coronary angiography have excellent image quality in patients with pacemaker. 640 - slice CT provides significantly better diagnostic image quality and artifacts of little influence than those of 64 - slice CT, and it had more success rate and applicability of CT coronary angiography.%目的

  20. Noninvasive coronary angiography using 64-slice spiral computed tomography in an unselected patient collective: Effect of heart rate, heart rate variability and coronary calcifications on image quality and diagnostic accuracy

    International Nuclear Information System (INIS)

    Objective: The aim of this study was to assess the impact of heart rate, heart rate variability and calcification on image quality and diagnostic accuracy in an unselected patient collective. Subjects and methods: One hundred and two consecutive patients with known or suspected coronary artery disease underwent both 64-MSCT and invasive coronary angiography. Image quality (IQ) was assessed by independent observers using a 4-point scale from excellent (1) to non-diagnostic (4). Accuracy of MSCT regarding detection or exclusion of significant stenosis (>50%) was evaluated on a per segment basis in a modified AHA 13-segment model. Effects of heart rate, heart rate variability, calcification and body mass index (BMI) on IQ and accuracy were evaluated by multivariate regression. IQ and accuracy were further analysed in subgroups of significant predictor variables and simple regression performed to calculate thresholds for adequate IQ. Results: Mean heart rate was 68.2 ± 13.3 bpm, mean heart rate variability 11.5 ± 16.0 beats per CT-examination (bpct) and median Agatston score 226.5. Average IQ score was 2 ± 0.6 whilst diagnostic quality was obtained in 89% of segments. Overall sensitivity, specificity, PPV or NPV was 91.2%, 99.2%, 95.3% or 98.3%. According to multivariate regression, overall IQ was significantly related to heart rate and calcification (P = 0.0038; P < 0.0001). The effect of heart rate variability was limited to IQ of RCA segments (P = 0.018); BMI was not related to IQ (P = 0.52). Calcification was the only predictor variable with significant effect on the number of non-diagnostic segments (P < 0.0001). In a multivariate regression, calcification was also the single factor with impact on diagnostic accuracy (P = 0.0049). Conclusion: Whilst heart rate, heart rate variability and calcification all show an inverse correlation to IQ, severe calcium burden remains the single factor with translation of such effect into decrease of diagnostic accuracy

  1. Spiral CT findings in septic pulmonary emboli

    Energy Technology Data Exchange (ETDEWEB)

    Iwasaki, Yoshinobu E-mail: yiwasaki@koto.kpu-m.ac.jp; Nagata, Kazuhiro; Nakanishi, Masaki; Natuhara, Atushi; Harada, Hidehiko; Kubota, Yutaka; Yokomura, Ichiro; Hashimoto, Shinichi; Nakagawa, Masao

    2001-03-01

    Objectives: The aim of the study was to determine the characteristics of septic pulmonary emboli and their prevalence on spiral computed tomographic (CT) scans. Methods and materials: We evaluated 65 lesions on spiral CT scans in ten patients with septic pulmonary emboli. Spiral CT scans (10-mm collimation) were obtained at 10-mm intervals from the lung apex to the diaphragm and were compared with posteroanterior chest radiographs obtained within 24 h after CT scanning. Results: Only 21 (32%) of the 65 lesions detected on CT scans were also detected on chest radiographs. Peripheral nodules (39 lesions (60%)) were seen in all ten patients, wedge-shaped peripheral lesions (15 lesions (23%)) in nine patients, and infiltrates (11 lesions (17%)) in four patients. Subpleural lesions (45 lesions (69%)) and feeding vessels (35 (54%)) were found in all patients, and cavitary lesions (seven lesions (11%)) were seen in four patients. Subpleural peripheral nodules and wedge-shaped peripheral lesions were seen in nine patients. Thirty-two lesions (49%) ranged in diameter from 10 to 19 mm, and 59 lesions (91%) were less than 30 mm. Conclusions: Spiral CT is useful in detecting septic pulmonary emboli. On spiral CT subpleural peripheral nodules and wedge-shaped peripheral lesions less than 30 mm in diameter are often found in patients with septic pulmonary emboli.

  2. Multi-slice spiral CT 3D reconstruction of extrahepatic feeding arteries in hepatocellular carcinoma:its clinical applications

    International Nuclear Information System (INIS)

    Objective: To discuss the feasibility of displaying the extrahepatic feeding arteries in hepatocellular carcinoma with the help of multi-slice spiral CT 3D reconstruction and to assess the clinical value of this technique. Methods: Triple-phase enhanced CT scanning with a 64-slice spiral CT scanner was performed in 89 patients with advanced primary hepatocellular carcinoma (HCC). Three-dimensional reconstruction techniques, including maximum intensity projection (MIP) and volume rendering (VR), with arterial phase images, were used to display the origination and course of both the intrahepatic and extrahepatic supplying arteries of HCC. The results were compared with the angiographic findings. Results: Of 59 cases with massive type HCC, extrahepatic supplying arteries were found in 33. In 21 cases of diffuse type HCC four showed extrahepatic supplying arteries,and in nine cases of nodular type HCC only one had extra-hepatic supplying arteries. The HCC could get their extrahepatic blood supply via eight pathways. A total of 44 extrahepatic supplying arteries were detected,and 19 anomalously originated hepatic arteries were found. Conclusion: The extrahepatic supplying arteries in hepatocellular carcinoma are common findings and their supplying pattern are extremely varied, which may be associated with the type and location of the tumors. Three-dimensional reconstruction technique with the help of triple-phase enhanced CT scanning on a 64-slice spiral CT scanner can provide excellent images as vivid and ideal as angiography can afford. Therefore,the times of angiography examination, the use of contrast media as well as the dose of radiation to both the patients and the physicians can be reduced as far as possible. The detailed information about extrahepatic blood supply is very useful for improving the therapeutic result of HCC. (authors)

  3. Assessment of Coronary Stents by 64-slice Computed Tomography:In-stent Lumen Visibility and Patency

    Institute of Scientific and Technical Information of China (English)

    Ling-yan Kong; Zheng-yu Jin; Shu-yang Zhang; Zhu-hua Zhang; Yi-ning Wang; Lan Song; Xiao-na Zhang; Yun-qing Zhang

    2009-01-01

    Objective To assess lumen visibility of coronary stents by 64-slice computed tomography(CT)coronary angiography,and determine the value of 64-slice CT in non-invasive detecting of in-stent restenosis after coronary artery stent implantation.Methods Totally,60 patients(54 males,aged 57.0±12.7 years)and 105 stents were investigated by 64-slice CT at a mean interval of 20.0±16.6 months after coronary stents implantation.Axial multi-planar reconstruction images of the stents and curved-planar reconstruction images through the median of the stents were reconstructed for evaluating stent image quality on a 5-point scale(1=excellent,5=nonassessable),and stent lumen diameter was detected.Conventional coronary angiography was performed in 18 patients,and 32 stents were evaluated.Results Image quality was good to excellent on average(score 1.71±0.76).Stent image quality score was correlated to heart rate(r=0.281,P<0.01)and stent diameter(r=0.480,P<0.001).All the stents were assessable in lumen visibility with an average visible lumen diameter percentage of 60.7% ±13.6% .Visible lumen diameter percentage was correlated to heart rate(r=-0.193,P<0.05),stent diameter (r=0.403,P<0.001),and stent image quality score(r=-0.500,P<0.001).Visible lumen diameter percentage also varied depending on the stent type.In comparison with the conventional coronary angiography,4 of 6 in-stent stenoses were correctly detected.The sensitivity and specificity for the detection of in-stent stenosis were 66.7% and 84.6% ,respectively.Conclusions Using a 64-slice CT,the stent lumen is partly visible in most of the stents.And 64-slice CT may be useful in the assessment of stent patency.

  4. Diagnostic Accuracy of 64-Slice Multislice Computed Tomography in Assessment of Coronary Artery Bypass Grafts

    Directory of Open Access Journals (Sweden)

    A. Arjmand Shabestari

    2007-05-01

    Full Text Available Background and Objective: Nowadays 64-slice mul-tislice computed tomography (MSCT has gained a wide acceptance as a non-invasive diagnostic imaging modality in native coronary arteries. This study was performed to determine the diagnostic accuracy of 64-slice MSCT in assessment of coronary artery by-pass grafting (CABG patency. Materials and Methods: 73 patients underwent both coronary CT-angiography (CTA using 64-slice MSCT scanner and quantitative coronary angiography (QCA were studied. Arterial and venous CABG patency was graded as: a-normal, b-patent with non-significant (<50% diameter reduction stenosis, c-patent with significant (≥50% diameter reduction stenosis or d-totally occluded. The results of CTA and QCA were compared. Results: Totally, 236 CABG were assessed, including 49 arterial and 187 venous grafts. Sensitivity, specific-ity, positive predictive value (PPV and negative pre-dictive value (NPV in detecting normal patency of arterial grafts were 100%, 85%, 95% and 100%, re-spectively and those in finding normal patency of ve-nous grafts all were 100%. The above-mentioned fig-ures for non-significant stenosis were 67% (2 out of 3 patients, 100%, 100% and 98% in arterial and 95%, 100%, 100% and 99% in venous grafts, respectively. Regarding to the significant stenosis, the results were 67% (2 out of 3 patients, 100%, 100% and 98% in arterial and 100%, 99%, 94% and 100% in venous grafts, respectively. All of these numerals were meas-ured being 100% for total occlusion of both arterial and venous grafts. Conclusion: Diagnostic accuracy of 64-slice MSCT in detecting normal patency, non-significant stenosis, significant stenosis and total occlusion of arterial and particularly venous CABG is extremely high so that QCA may be eventually substituted by CTA in a near future.

  5. Evaluation of the Optimal Image Reconstruction Interval for Coronary Artery Imaging Using 64-Slice Computed Tomography

    International Nuclear Information System (INIS)

    Background: Cardiac computed tomography (CT) has become an established complement in cardiac imaging. Thus, optimized image quality is diagnostically crucial. Purpose: To prospectively evaluate whether, by using 64-slice CT, a specific reconstruction interval can be identified providing best image quality for all coronary artery segments and each individual coronary artery. Material and Methods: 311 coronary segments of 14 men and seven women were analyzed using 64-slice CT. Data reconstruction was performed in 5% increments from 5-100% of the R-R interval. Four experienced observers independently evaluated image quality of the coronary arteries according to the AHA classification. A three-point ranking scale was applied: 1, very poor, no evaluation possible; 2, diagnostically sufficient quality; 3, highest image quality, no artifacts. Results: The best reconstruction point for all segments was found to be 65% of the R-R interval (mean value 2.4±0.5; P<0.05). On a per-artery basis, best image quality was again achieved at 65% of the R-R interval: RCA 2.2±0.4, LCA 2.4±0.5, LM 2.5±0.2, LAD 2.3±0.4, LCX 2.3±0.5. Conclusion: By using 64-slice CT, the need for adjusting the reconstruction point to each coronary segment might be overcome. Best image quality was achieved with image reconstruction at 65% of the R-R interval for all coronary segments as well as each coronary artery

  6. 进展期非小细胞肺癌的首过法CT灌注可重复性研究%Advanced NSCLC First Pass Perfusion at 64-slice CT: Reproducibility of Volume-based Quantitative Measurement

    Institute of Scientific and Technical Information of China (English)

    单飞; 张志勇; 曾蒙苏; 胡洁; 白春学

    2010-01-01

    背景与目的 本研究旨在探讨进展期非小细胞肺癌(non-small cell lung cancer, NSCLC)首过法CT灌注(CT perfusion, CTP)的可重复性.方法 在本院行首过法CTP检查(8×5 mm层厚),且经病理证实的进展期NSCLC患者14例,肿瘤最大径≤3 cm及>3 cm各7例,均在24 h内行第二次CTP扫描.采用组内相关系数(intraclass correlationcoefficient, ICC)及Bland-Altman法评价CTP检查的可重复性.结果 两组进展期NSCLC的血流速度(blood flow, BF)、血容量(blood volume, BV)及表面通透性(permeability surface area product, PS)值的ICC均>0.75;对比剂的平均通过时间(mean transit time, MTT)的ICC均3 cm组的BF、BV、MTT及PS的RC及RC值95%变化区间依次为46%(-48%-45%)、30%(-33%-26%)、-59%(-54%-64%)、33%(-18%-48%).结论 去卷积法首过法CTP参数BF及BV可重复性较好,用于评价进展期NSCLC抗血管生成治疗疗效时,可根据肿瘤大小,应用不同的可重复性标准区别对待.

  7. Assessment of spiral CT pneumocolon in preoperative colorectal carcinoma

    Institute of Scientific and Technical Information of China (English)

    Can-Hui Sun; Zi-Ping Li; Quan-Fei Meng; Shen-Ping Yu; Da-Sheng Xu

    2005-01-01

    AIM: To investigate the value of spiral CT pneumocolon in preoperative colorectal carcinoma.METHODS: Spiral CT pneumocolon was performed prior to surgery in 64 patients with colorectal carcinoma. Spiral CT images were compared to specimens from the resected tumor.RESULTS: Spiral CT depicted the tumor in all patients.Comparison of spiral CT and histologic results showed that the sensitivity and specificity were 95.2%, 40.9% in detection of local invasion, and 75.0%, 90.9% in detection of lymph node metastasis. Compared to the Dukes classification,the disease was correctly staged as A in 6 of 18 patients,as B in 18 of 23, as C in 10 of 15, and as D in 7 of 8. Overall,spiral CT correctly staged 64.1% of patients.CONCLUSION: Spiral CT pneumocolon may be useful in the preoperative assessment of patients with colorectal carcinoma as a means for assisting surgical planning.

  8. Physical performance characteristics of spiral CT scanning

    International Nuclear Information System (INIS)

    This paper reports on CT scanning in spiral geometry that has recently been introduced; it is achieved by continuous patient transport during continuous multirotational data acquisition. While the advantages for clinical studies are obvious, the physical performance characteristics have to be investigated to detail. Phantom studies and clinical studies have been performed on a Somatom Plus (Siemens AG, Erlangen, West Germany). In addition, simulation studies have been carried out to estimate section-sensitivity profiles, noise, and artifact behavior. RESULTS: Many of the standard physical performance characteristics (eg, spatial resolution, image uniformity, dose values, and contrast) are not affected by spiral CT scanning. Artifact behavior, pixel noise, and section-sensitivity profiles are changed as a function of table speed; the changes agree with predictions by simulation. Pixel noise is reduced by about a factor of 0.8 in reconstruction by an interpolation procedure. Sensitivity profiles are smoothed because the original profile is convolved with the object motion function. Drawbacks of spiral CT with respect to image quality are not significant. The advantages offered by continuous canning and arbitrary retrospective selection of section positions within the scanned volume clearly more than compensate for the slight disadvantages

  9. Müller状态下64排螺旋CT对阻塞性睡眠呼吸暂停低通气综合征诊断价值的研究%The study of the diagnostic value of 64-slice CT in obstructive sleep apnea hypopnea syndrome in Müller mameuver

    Institute of Scientific and Technical Information of China (English)

    周旭; 王建中; 刘骏桢

    2013-01-01

    目的:通过对平静呼吸和Müller状态下的中重度OSAHS患者行CT扫描,了解Müller状态下上气道阻塞塌陷的具体部位、程度及累及范围,为手术治疗提供依据.方法:对30例经PSG确诊的中重度OSAHS患者分别行平静呼吸和Müller状态下64排VCT扫描,并经上气道三维重建和仿真内镜技术处理,比较2种状态下上气道各平面横截面积和各径线长度以及咽壁厚度、软腭悬雍垂长厚度、软硬腭角度、舌骨硬腭距离等指标.结果:平静呼吸时吸气末和Müller's动作吸气末各平面截面积和径线比较,舌根后区及会厌后区的前后径差异无统计学意义(P>0.05),其余所有气道径线的差异均有统计学意义(P<0.05).各平面软组织厚度比较,软腭后区、悬雍垂后区、舌根后区左右侧壁软组织厚度及软腭后区的后壁厚度、悬雍垂软腭长厚度比较差异均有统计学意义(P<0.05),软硬腭角度比较差异有统计学意义(P<0.05),舌骨的位置在Müller' s动作时有显著的下移.结论:通过64排CT上气道三维重建和仿真内镜技术,可推测中重度OSAHS患者打鼾时上气道塌陷阻塞的具体部位、程度、累及范围,以及上气道各平面软组织的变化情况,其临床应用价值大.%Objective:To examine the location,extent and cause of collapsed airway in Muller maneuver in OS-AHS patients with CT scan,and provide the evidence for surgery. Method:Thirty patients with moderate or severe OSAHS were measured with 64 slice CT in quiet breathing and in Muller maneuver. After three-dimensional reconstruction and virtual endoscope handing of the upper airway, we compare the cross-section area and the dimensions of five levels as well as the thickness of retropharyngeal and lateral pharyngeal tissue in two conditions. The evaluation values include the length and thickness of soft palate and uvula, soft-hard palate angle and hyoid hard palate distance. Result:The lateral distance

  10. Study on the three dimensional hepatic virtual operation based on the data of 64-slice helical CT scanning%基于64排螺旋CT扫描数据三维肝脏手术仿真的研究

    Institute of Scientific and Technical Information of China (English)

    朱新勇; 方驰华; 鲍苏苏; 全显跃; 焦培峰; 钟世镇

    2008-01-01

    目的 研究基于64排螺旋CT扫描数据的三维肝脏虚拟手术的设计和仿真效果,以及基于自由设计模型系统(FreeForm Modeling System)的虚拟手术的可行性.方法 采集正常人肝脏64排薄层扫描数据集,利用医学三维重建软件(MIMICS软件)进行肝脏及其肝内血管三维重建,并将重建的肝脏及其管道模型、人工绘制肝脏肿瘤模拟物导入FreeForm Modeling System,利用力反馈设备(PHANToM),对肝脏模型进行手术切割.结果 通过旋转和放大目标物体,肿瘤与肝内血管的立体关系能清晰展示.根据手术原则,使用PHANToM操纵"手术刀",仿真左外叶切除,术中肝内管道结构容易识别,其过程基本符合临床肝脏肿瘤切除的手术过程并可调节目标物体的强度,感受切割时力反馈的大小.结论 利用FreeForm Modeling System虚拟手术系统仿真肝脏手术切割,可以制定合理的个体化手术方案,减少并发症发生,提高手术成功率.%Objective To study the surgery plan and simulation effect of the three dimensional(3D)hepatic virtual operation based on the data of 64-slice helical CT scanning and to probe the feasibility of the virtual operation based on the FreeFotin Modeling System.Methods The volunteer liver Was scanned to collect two dimensional(2D)DICOM data of 64-slice helical CT scanning and the 3D hepatic and intrahepatic vessels model were reconstructed by MIMICS software.The reconstructed liver,the intrahepatic vessels model and the artificial tumor models were outputted into the FreeForm Modeling System in the STL format.The device PHANToM with the characterization of dynamo-feedback was applied to make the operation on tlle 3D hepatic.Resuits The spatial relationship between the tumour and the intrahepatic vessels were clearly observed by rotation and enlargement of the target.According to the operation principle,the left lobe of liver resection was simulated by manipulating the device PHANToM.Through the

  11. 下肢动脉闭塞性疾病64层CT血管成像中腘动脉小剂量对比剂试验的意义%64-slice CT angiography in lower extremity peripheral arterial occlusive disease: clinical value of test injection at popliteal arteries

    Institute of Scientific and Technical Information of China (English)

    舒政; 邓小飞; 葛琛瑾; 孙凤; 邹银鸽; 孟文斌

    2011-01-01

    Objective To investigate the clinical value of the test injection at popliteal arteries on 64-slice CTA in lower extremity peripheral arterial occlusive disease (PAOD). Methods Twenty-eight patients with PAOD referred for 64-slice CTA were enrolled consecutively in the study. Test injection was performed at bilateral popliteal arteries (the level of knee joints) and the clinic value of the peak value and the time to peak was analyzed. The relationship between the time to peak and the peak value was evaluated with Pearson test. The time to peak was used for programming of the CT angiographic acquisitions with fast scanning mode. The quality of visualization of each arterial segment was determined independently by two radiologists. Results Fifty-four (96%, 54/56) time-attenuation curves were obtained in 28 patients. The wide interindividual variation in the peak value and the time to peak was observed in 52 curves of 26 patients with range of 60-178 HU,21-46 s and an average of (135±28) HU,(31±6) s, respectively. The difference in the peak value and the time to peak between bilateral popliteal arteries was also observed with range of 10-80 HU and an average of (32±18) HU in 19 patients,with range of 1-12 s and an average of (5±3) s in 21 patients. There was negative relationship between the peak value and the time to peak (r=-0.526, P<0.01). The CTA images were of good (598 segments) or medium quality (12 segments) in 99% segments (610/616). Conclusions The test injection at popliteal arteries was useful for 64-slice CTA in the patients with PAOD, as it could accurately specify the delay time of CT angiographic acquisitions.%目的 探讨下肢动脉闭塞性疾病采用64层CT血管成像时,在腘动脉行小剂量对比剂试验的意义.方法 连续选取28例临床怀疑下肢动脉闭塞性疾病患者,应用64层CT在两侧腘动脉(膝关节层面)各设置一ROI进行小剂量对比剂试验,明确显示峰值及达峰时间者认为曲线获取成功.

  12. 64排螺旋CT冠状动脉成像与冠状动脉造影对心肌桥诊断的比较研究%Diagnosis Comparison of Myocardial Bridge by 64-slice CT Coronary Angiography and Conventional Coronary Angiography

    Institute of Scientific and Technical Information of China (English)

    施斌斌; 吴晶涛; 征锦; 叶靖; 王守安

    2012-01-01

    目的:比较64排螺旋CT冠状动脉成像(64 SCTCA)和冠状动脉造影(CAG)对心肌桥(MB)的诊断价值.方法:832例患者分别行64SCTCA扫描及CAG,观察有无MB及测量MB的长度、厚度、壁冠状动脉(MCA)狭窄程度等,并对结果进行对比研究.结果:64 SCTCA MB检出率为18.3%,CAG MB检出率为10.2%,两者比较差异有统计学意义(P<0.05).64 SCTCA与CAG对MB的狭窄程度及长度比较,差异也有统计学意义(P<0.05).结论:与CAG相比,64SCTCA对MB有较高的检出率,并能准确显示壁冠状动脉与心肌的解剖关系.%Objective To compare the clinical significance of 64-slice coronary CT angiography(64 SCTA) and conventional coronary angiography(CAG) for identification of myocardial bridge. Methods Eight hundred and thirty —two patients with suspected coronary artery disease underwent multi-detector row CT and conventional coronary angiography respectively.The prevalence, precise location, length, depth and concomitant atheromatous changes were evaluated. Results One hundred and sixty-five sites of MB were found in 152(18.3%, 152/832) of 832 patients with 64 SCTA, with MB detection rate of 10.2% by CAG, and the difference was statistically significant(P<0.05). There was also significant difference between 64 SCTCA and CAG for the degree and length of stenosis of the MB. Conclusion Compared with CAG, 64 SCTCA has a higher detection rate for MB, and can accurately show the relationship between mural coronary arteries and myocardial.

  13. Prognostic value of absence or presence of coronary artery disease determined by 64-slice computed tomography coronary angiography A systematic review and meta-analysis

    DEFF Research Database (Denmark)

    Abdulla, Jawdat; Asferg, Camilla Lundegaard; Kofoed, Klaus Fuglsang

    2011-01-01

    To determine via a meta-analysis the prognostic value of 64-slice computed tomography angiography (CTA) by quantifying risk of major adverse cardiac events (MACE) in different patient groups classified according to CT angiographic findings. A systematic literature search and meta-analyses was con...

  14. The relationship between the appearances of colorectal tumor in multi-slices spiral CT and the pathologic histology

    International Nuclear Information System (INIS)

    Objective: To evaluate the relationship between the appearances of colorectal tumor in multi-slices spiral-CT and the pathologic histology. Methods: 92 patients with colorectal tumor, who had undergone preoperative MSCT examination, were reviewed retrospectively. The detail information of their appearances in multi-slices spiral CT, the pathologic histology, lymph node metastasis and pericolonic infiltration were analyzed. All the patients were cleaned intestine tracts and were given an enema (2.5% iso-osmia mannitol solution) before undergoing plain scan and portal venous phase enhanced scan with 64-slices spiral-CT Patients were classified into five types according to pathology: well-differentiated, moderately differentiated, poorly differentiated adencarcinoma, mucinous adenocarcinoma and signet-ring cell carcinoma. And then each group's CT features in plain and enhanced scan, lymph node metastasis, remote metastasis and infiltration were analyzed. Eventually, they were categorized into three groups based on their pathology of statistics. The first group was the poorly differentiated adencarcinoma, the second mucinous adenocarcinoma and signet-ring cell carcinoma, and the third well-differentiated and moderately differentiated adenocarcinoma. Results Of all these cases, 74 cases were of moderately differentiated adencarcinoma, and 4 cases of well differentiated adencarcinoma, 6 cases of poorly differentiated adencarcinoma, 7 cases of mucinous adenocarcinoma, only 1 case was of signet-ring cell carcinoma In first group, the average CT value in plain scanning was 41.00±6.39Hu, and 74.83±9.48Hu after contrast enhancement. In second group, the CT value was 39.00±3.46Hu and 73.66±11.66Hu respectively. In third group, the CT value was 44.83±5.95Hu and 85.05±10.47Hu respectively. Statistically significant difference existed comparing the first group with those of the other two groups (p<0.05). Each group's ratio of lymph node metastasis was 50% in first group, 37

  15. 后置滤过器对64排螺旋CT冠状动脉成像质量影响的CATPHAN模型研究%Effect of various post-processing filters on image quality of 64-slice CT coronary angiography by using a Catphan phantom

    Institute of Scientific and Technical Information of China (English)

    Syed Shareef Fahad; 宦坚; 张伟; 龚建平; 乔方; 朱建兵; 陈光强

    2012-01-01

    Objective To evaluate the effect of various post-processing filters on image quality of 64-Slice CT coronary angiography. Methods Catphan 600 underwent cardiac scans by using GE LightSpeed VCT. The scan techniques undergone at 120 kV, 600 mA, speed of 0. 35 s per 360° rotation, pitch of 0. 20, slice thickness of 625 mm. Cardiac images were reconstructed by using filters of Cl ( UC1) , C2 (UC2), C3 (UC3 ) and were constracted without filter ( NUC) to create four image sets from the same scanning. Image noises were measured, and CNR, SNR, MTF were calculated for the four sets. Difference was examined by using one-way analysis of variance. Results Significant difference was found in terms of SD,CNR,SNR, MTF 50% (P 0.05). MTF 10% was significantly lower for UC3 than fhat for the other three sets (P<0.05). Conclusion Different post-processing filters should be selected according to the clinical requirements, because of their different effect on SD,CNR,SNR and MTF.%目的 探讨不同后置滤过器对64排螺旋CT冠状动脉成像(CTCA)质量的影响.方法 使用GE LightSpeed VCT机,采用120 kV,600 mA,0.35s/360°,层厚0.625 mm,pitch 0.2对Catphan 600模型进行扫描.采像后对原始图像分别进行不使用后置滤过器和使用后置滤过器C1、C2、C3重建,得到4组图像(NUC组、UC1组、UC2组和UC3组).测量图像噪声(SD),计算对比噪声比(CNR)、信噪比(SNR)、调制传输函数(MTF).统计分析采用单因素方差分析.结果 NUC组、UC1组、UC2组和UC3组的SD、CNR、SNR及MTF 50%差异均有高度统计学意义(均P<0.001),NUC组、UC1组和UC2组的MTF 10%差异无统计学意义(均P>0.05);UC3组与其余3组的MTF 10%差异有高度统计学意义(均P<0.01).结论 不同后置滤过器对CTCA图像SD、CNR、SNR和MTF的影响不同,可根据不同临床需要适当选择.

  16. Dosimetry in dental radiology. Dentascan spiral CT versus panoramic radiography

    International Nuclear Information System (INIS)

    The study compares the doses absorbed by the dentomaxillary area in spiral CT and panoramic examinations. The dose measurements demonstrate that patients receive smaller doses with panoramic radiography than with spiral CT with Dentascan. After following for some variations from instrumental differences, they are in substantial agreement with literature data. Further investigations are needed considering the radiobiological risk related to the growing spread of Dentascan examinations

  17. Negative spiral CT in acute pulmonary embolism

    Energy Technology Data Exchange (ETDEWEB)

    Nilsson, T.; Olausson, A. [Karolinska Hospital, Stockholm (Sweden). Dept. of Thoracic Radiology; Johnsson, H. [Karolinska Hospital, Stockholm (Sweden). Dept. of Internal Medicine; Nyman, U. [County Hospital, Trelleborg (Sweden). Dept. of Radiology; Aspelin, P. [Huddinge Univ. Hospital (Sweden). Dept. of Radiology

    2002-09-01

    Purpose: To retrospectively evaluate the clinical outcome of non-anticoagulated patients with clinically suspected acute pulmonary embolism (PE) and no symptoms or signs of deep venous thrombosis (DVT) following a negative contrast medium-enhanced spiral CT of the pulmonary arteries (s-CTPA). Material and Methods: During a 24-month period, 739 of 751 patients underwent s-CTPA with acceptable diagnostic quality for clinically suspected acute PE. All patients who had a CT study not positive for PE were followed up with a questionnaire, a telephone interview and review of all medical reports, including autopsies and death certificates for any episodes of venous thromboembolism (VTE) during a 3-month period. Results: PE was diagnosed in 158 patients. Of the remaining 581 patients with a negative s-CTPA, 45 patients were lost to follow-up. 88 patients were excluded because of anticoagulation treatment (cardiac disorder n=32, chronic VTE or acute symptomatic DVT n=31, PE diagnosed at pulmonary angiography n=1, thrombus prophylaxis during diagnostic work-up or other reasons than VTE n=24) and 7 patients undergoing lower extremity venous studies because of symptoms of DVT (all negative). Thus, 441 patients with a negative s-CTPA and no DVT symptoms, venous studies or anticoagulant treatment constituted the follow-up cohort. Four of these patients had proven VTE (all PE) during the 3-month follow-up period. Two of the PE episodes contributed to the patient's death. Conclusion: Patients with clinically suspected acute PE, no symptoms or signs of DVT and a negative single slice s-CTPA using 3-5 mm collimation, may safely be left without anticoagulation treatment unless they are critically ill, have a limited cardiopulmonary reserve and/or if a high clinical suspicion remains.

  18. Negative spiral CT in acute pulmonary embolism

    International Nuclear Information System (INIS)

    Purpose: To retrospectively evaluate the clinical outcome of non-anticoagulated patients with clinically suspected acute pulmonary embolism (PE) and no symptoms or signs of deep venous thrombosis (DVT) following a negative contrast medium-enhanced spiral CT of the pulmonary arteries (s-CTPA). Material and Methods: During a 24-month period, 739 of 751 patients underwent s-CTPA with acceptable diagnostic quality for clinically suspected acute PE. All patients who had a CT study not positive for PE were followed up with a questionnaire, a telephone interview and review of all medical reports, including autopsies and death certificates for any episodes of venous thromboembolism (VTE) during a 3-month period. Results: PE was diagnosed in 158 patients. Of the remaining 581 patients with a negative s-CTPA, 45 patients were lost to follow-up. 88 patients were excluded because of anticoagulation treatment (cardiac disorder n=32, chronic VTE or acute symptomatic DVT n=31, PE diagnosed at pulmonary angiography n=1, thrombus prophylaxis during diagnostic work-up or other reasons than VTE n=24) and 7 patients undergoing lower extremity venous studies because of symptoms of DVT (all negative). Thus, 441 patients with a negative s-CTPA and no DVT symptoms, venous studies or anticoagulant treatment constituted the follow-up cohort. Four of these patients had proven VTE (all PE) during the 3-month follow-up period. Two of the PE episodes contributed to the patient's death. Conclusion: Patients with clinically suspected acute PE, no symptoms or signs of DVT and a negative single slice s-CTPA using 3-5 mm collimation, may safely be left without anticoagulation treatment unless they are critically ill, have a limited cardiopulmonary reserve and/or if a high clinical suspicion remains

  19. Serial changes of coronary atherosclerotic plaque: Assessment with 64-slice multi-detector computed tomography

    International Nuclear Information System (INIS)

    Evaluate the progression of coronary atherosclerotic plaque during follow-up, and its association with cardiovascular risk factors. Fifty-six atherosclerotic patients with plaque were enrolled in this retrospective study. Patient's plaque was detected on repeat 64-slice multidetector CT scans with a mean interval of 25 ± 10 months changes in calcified and non-calcified plaque volumes and cardiovascular risk factors were assessed over time. Absolute and relative changes in plaque volume were compared, and the association between rapid progression and cardiovascular risk factors was determined. Diameter of the stenosis, length, calcified and non-calcified lesion plaque volumes increased significantly on follow-up CT. Absolute and relative annual changes in plaque volumes were significantly greater in non-calcified plaque (median, 22.7 mm3, 90.4%) than in calcified plaque (median, 0.7 mm3, 0%). Obesity, smoking, hypertension, hypercholesterolemia, and low high-density lipoprotein were significant predictors of progression of non-calcified plaque. Progression of calcified plaque was not associated with any cardiovascular risk factors. Coronary plaque volume increased significantly on follow-up CT. The rate of progression is related to non-calcified plaque than to calcified plaque. Cardiovascular risk factors are independently associated with the rapid progression of non-calcified plaque volume, but not associated with the progression of calcified plaque.

  20. Serial changes of coronary atherosclerotic plaque: Assessment with 64-slice multi-detector computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Eun Young; Kang, Doo Kyoung; Sun, Joo Sung; Choi, So Yeon [Ajou University School of Medicine, Suwon (Korea, Republic of)

    2013-12-15

    Evaluate the progression of coronary atherosclerotic plaque during follow-up, and its association with cardiovascular risk factors. Fifty-six atherosclerotic patients with plaque were enrolled in this retrospective study. Patient's plaque was detected on repeat 64-slice multidetector CT scans with a mean interval of 25 ± 10 months changes in calcified and non-calcified plaque volumes and cardiovascular risk factors were assessed over time. Absolute and relative changes in plaque volume were compared, and the association between rapid progression and cardiovascular risk factors was determined. Diameter of the stenosis, length, calcified and non-calcified lesion plaque volumes increased significantly on follow-up CT. Absolute and relative annual changes in plaque volumes were significantly greater in non-calcified plaque (median, 22.7 mm{sup 3}, 90.4%) than in calcified plaque (median, 0.7 mm{sup 3}, 0%). Obesity, smoking, hypertension, hypercholesterolemia, and low high-density lipoprotein were significant predictors of progression of non-calcified plaque. Progression of calcified plaque was not associated with any cardiovascular risk factors. Coronary plaque volume increased significantly on follow-up CT. The rate of progression is related to non-calcified plaque than to calcified plaque. Cardiovascular risk factors are independently associated with the rapid progression of non-calcified plaque volume, but not associated with the progression of calcified plaque.

  1. Correlation between the Quantifiable Parameters of Whole Solitary Pulmonary Nodules Perfusion Imaging Derived with Dynamic CT and Nodules Size

    Directory of Open Access Journals (Sweden)

    Shiyuan LIU

    2009-05-01

    Full Text Available Background and objective The solitary pulmonary nodules (SPNs is one of the most common findings on chest radiographs. The blood flow patterns of the biggest single SPNs level has been studied. This assessment may be only a limited sample of the entire region of interest (ROI and is unrepresentative of the SPNs as a volume. Ideally, SPNs volume perfusion should be measured. The aim of this study is to evaluate the correlation between the quantifiableparameters of SPNs volume perfusion imaging derived with 16-slice spiral CT and 64-slice spiral CT and nodules size. Methods Sixty-five patients with SPNs (diameter≤3 cm; 42 malignant; 12 active inflammatory; 11 benign underwent multi-location dynamic contrast material-enhanced serial CT scanning mode with stable table were performed; The mean values of valid sections were calculated, as the quantifiable parameters of volume SPNs perfusion imaging derived with16-slice spiral CT and 64-slice spiral CT. The correlation between the quantifiable parameters of SPNs volume perfusion imaging derived with 16-slice spiral CT and 64-slice spiral CT and nodules size were assessed by means of linear regression analysis. Results No significant correlations were found between the nodules size and each of the peak height (PHSPN (32.15 Hu±14.55 Hu,ratio of peak height of the SPN to that of the aorta (SPN-to-A ratio(13.20±6.18%, perfusion(PSPN (29.79±19.12 mLmin-1100 g-1 and mean transit time (12.95±6.53 s (r =0.081, P =0.419; r =0.089, P =0.487; r =0.167, P =0.077; r =0.023, P =0.880. Conclusion No significant correlations were found between the quantifiable parameters of SPNs volume perfusion imaging derived with 16-slice spiral CT and 64-slice spiral CT and nodules size.

  2. Diagnostic Value of 64-slice CTA in Detection of Intracranial Aneurysm in Patients with SAH and Comparison of the CTA Results with 2D-DSA and Intraoperative Findings

    OpenAIRE

    Ergun, Elif; Haberal, Murat; Koşar, Pınar; Yılmaz, Ali; Koşar, Uğur

    2011-01-01

    Objective: To prospectively evaluate the diagnostic value of 64-slice CTA in detecting intracranial aneurysms and to compare it with 2D-DSA and/or intra-operative findings. Material and Methods: 37 cases with SAH according to unenhanced cranial CT were included in the study. A 64-slice CTA was performed to all cases immediately after the nonenhanced cranial CT. DSA was performed in 24-48 hours following CTA. CT images were reviewed by two radiologists experienced in CT vascular imag...

  3. Diagnostic Value of 64-slice CTA in Detection of Intracranial Aneurysm in Patients with SAH and Comparison of the CTA Results with 2D-DSA and Intraoperative Findings

    OpenAIRE

    Elif Ergun; Murat Haberal; Pınar Koşar; Ali Yılmaz; Uğur Koşar

    2011-01-01

    Objective: To prospectively evaluate the diagnostic value of 64-slice CTA in detecting intracranial aneurysms and to compare it with 2D-DSA and/or intra-operative findings.Material and Methods: 37 cases with SAH according to unenhanced cranial CT were included in the study. A 64-slice CTA was performed to all cases immediately after the nonenhanced cranial CT. DSA was performed in 24-48 hours following CTA. CT images were reviewed by two radiologists experienced in CT vascular imaging. The ...

  4. Multislice spiral CT of the paranasal sinuses; Mehrschicht-Spiral-CT der Nasennebenhoehlen: Erste Erfahrungen unter besonderer Beruecksichtigung der Strahlenexposition

    Energy Technology Data Exchange (ETDEWEB)

    Dammann, F.; Bode, A.; Heuschmid, M.; Kopp, A.; Georg, C.; Pereira, P.L.; Claussen, C.D. [Tuebingen Univ. (Germany). Radiologische Universitaetsklinik

    2000-08-01

    Purpose: To evaluate the potential of multislice CT in the diagnosis of the paranasal sinuses. Methods: Dose measurements were performed exposing an Alderson Rando phantom in a four-slice spiral CT (MS-CT) while applying a variety of scan parameters. Additionally, 30 consecutive patients underwent a transversal examination by the MS-CT using 1/1/3.5/0.5 mm spiral parameters and an additional transversal or coronal scan on a conventional single slice spiral CT (SS-CT) with 2/3/1 mm. Coronal reformations of the MS-CT were compared with the primary coronal SS-CT, or coronal reformations of the transversal SS-CT, respectively, with regard to image quality and depiction of relevant anatomical details of the region. Results: Superficial exposure values at the level of the eye lenses as well as for the thyroid gland were superior for MS-CT (3.62 mGy, and 0.12 mGy, resp.) as compared to SS-CT (2.96 mGy, and 0.07 mGy). Image quality was equal or superior for MS-CT as compared to SS-CT in all but one case. Drawbacks of SS-CT, such as dental amalgam artifacts, stair step artifacts or partial volume artifacts did not notably affect the coronal reformations of MS-CT. Conclusions: MS-CT seems to have the potential to replace primary coronal CT of the paranasal sinuses without any loss of image quality, but may even improve the overall diagnostic value. Radiation doses may still have to be reduced. (orig.) [German] Ziel: Erprobung eines Multislice-CT (MS-CT) zur Diagnostik der Nasennebenhoehlen (NNH). Methode: An einem Alderson Rando Phantom wurden Dosismessungen bei der Spiral-CT der NNH mit einem Mehrschicht-CT (MS-CT) unter Verwendung unterschiedlicher Scanparameter durchgefuehrt. Anschliessend wurden 30 konsekutive Patienten an dem MS-CT mit den Spiralparametern 1/1/3,5/0,5 mm und einem konventionellen Einzeilen Spiral-CT (SS-CT; 2/3/1 mm) untersucht. Die koronaren Rekonstruktionen der transversalen MS-CT wurden mit den koronaren Rekonstruktionen bzw. den primaeren koronaren

  5. 我院大型医疗设备-64排CT安装及验收的流程管理%Working flow of installation and check & acceptance of 64-slice spiral CT in our hospital

    Institute of Scientific and Technical Information of China (English)

    韩玺梅; 彭毅; 张宏阳

    2009-01-01

    介绍了大型医疗设备安装及验收中遵循的流程模式.主要流程项目有: (1)接受合同时间; (2)合同审核, (3)合同约定到货时间; (4)场地准备情况; (5)实际到货时间; (6)现场开箱及商检; (7)备品配件情况; (8)随机技术资料情况; (9)进口设备的手续及资料; (10)安装后设备的技术指标符合隋况; (11)人员操作及维修培训情况; (12)计量检定情况; (13)设备保修期开始及截止日期.通过流程管理的实施使设备验收达到了很好的效果,并小结了其中的一些经验和体会与同仁共享.%This paper introduces the working flow of the installation and the check & acceptance of the medical equipment.The maior working flow includes the following item.(1)the time of accepting contract.(2)Auditing contract.(3)confirming the arrival time of the equipment.(4)preparing fabricating yard for the equipment installation.(5)the actual time of the equipment arriving.(6)unpacking and inspecting.(7)checking accessories of the equipment.(81collecting the manual of the equipment.(9)the procedure information of the importing equipment.(10)checking the eligibility of the equipment.(11)the operation and the training of the maintenance.(12)the measuring and auditing of the equipment.(13)the maintenance of equipment time.The working flow contributes a lot to our equipment checking & acceptance.In this article,we summarize the experience of the checking &acceptance of the medical equipment.

  6. 64层螺旋CT血管造影在蛛网膜下腔出血诊断的临床运用%Clinical application of 64-slices spiral CT angiography in diagnosing subarachnoid haemorrhage

    Institute of Scientific and Technical Information of China (English)

    苏海; 孙晓川; 朱继; 唐文渊

    2007-01-01

    目的:探讨64层螺旋CT血管造影(CTA)在蛛网膜下腔出血(SAH)病因诊断中的作用.方法:对2005年9月到2006年9月收治入院的89例SAH患者行64层螺旋CT血管造影检查,其中49例同时接受数字减影血管造影(DSA)检查.分析CTA检查结果并与DSA检查结果比较.结果:89例患者中CTA检出动脉瘤70例,动静脉畸形9例,静脉窦血栓2例,阴性8例;在同时接受DSA检查的49例患者中,发现动脉瘤41例,动静脉畸形4例,阴性4例,其中除1例CTA发现并经临床证实的动脉瘤DSA检查为阴性外,其余全部证实CTA诊断.CTA对SAH病因诊断中的敏感性和特异性都为100%,DSA分别为98%和100%.结论:64层螺旋CTA对SAH的病因诊断是一种无创、快速、便捷的影像学检查方法,可显示血管的空间立体结构及周边关系,有助于治疗方法的选择和难度的评估.

  7. High-resolution ex vivo imaging of coronary artery stents using 64-slice computed tomography - initial experience

    Energy Technology Data Exchange (ETDEWEB)

    Rist, Carsten; Nikolaou, Konstantin; Wintersperger, Bernd J.; Reiser, Maximilian F.; Becker, Christoph R. [Ludwig-Maximilians University, Department of Clinical Radiology, Munich (Germany); Flohr, Thomas [Siemens Medical Solutions, CT Division, Forchheim (Germany)

    2006-07-15

    The aim of the study was to evaluate the potential of new-generation multi-slice computed tomography (CT) scanner technology for the delineation of coronary artery stents in an ex vivo setting. Nine stents of various diameters (seven stents 3 mm, two stents 2.5 mm) were implanted into the coronary arteries of ex vivo porcine hearts and filled with a mixture of an iodine-containing contrast agent. Specimens were scanned with a 16-slice CT (16SCT) machine; (Somatom Sensation 16, Siemens Medical Solutions), slice thickness 0.75 mm, and a 64-slice CT (64SCT, Somatom Sensation 64), slice-thickness 0.6 mm. Stent diameters as well as contrast densities were measured, on both the 16SCT and 64SCT images. No significant differences of CT densities were observed between the 16SCT and 64SCT images outside the stent lumen: 265{+-}25HU and 254{+-}16HU (P=0.33), respectively. CT densities derived from the 64SCT images and 16SCT images within the stent lumen were 367{+-}36HU versus 402{+-}28HU, P<0.05, respectively. Inner and outer stent diameters as measured from 16SCT and 64SCT images were 2.68{+-}0.08 mm versus 2.81{+-}0.07 mm and 3.29{+-}0.06 mm versus 3.18{+-}0.07 mm (P<0.05), respectively. The new 64SCT scanner proved to be superior in the ex vivo assessment of coronary artery stents to the conventional 16SCT machine. Increased spatial resolution allows for improved assessment of the coronary artery stent lumen. (orig.)

  8. Design Consideration and Reconstruction Method for Double-source Double-multislice Spiral CT

    Institute of Scientific and Technical Information of China (English)

    LIU Zun-gang; ZHAO Jun; ZHUANG Tian-ge

    2007-01-01

    To accelerate the scan speed and improve the image quality, a new type of CT configuration, "doublesource double-multislice spiral CT" (DSDMS-CT), which is based on two sets of single-source multislice spiral CT was proposed with a special reconstruction algorithm.Simulation results using the fan-beam filtered backprojection algorithm with a special interpolation method were presented for both single-source multislice spiral CT and DSDMS-CT.The results of new CT model show that it scans faster than the traditional spiral CT and has a better slice sensitivity profile (SSP) with larger pitch value.

  9. Relationship between Willis circle variation and the occurrence of anterior and posterior communicaring artery aneurysms investigated by 64-slice CT angiography%CT血管成像评价颅内Willis环变异与前后交通动脉动脉瘤发生的关系

    Institute of Scientific and Technical Information of China (English)

    王洪生; 徐新文; 王辉; 杨昭伟; 王鹏; 赵佩林; 王阳春

    2011-01-01

    目的 探讨大脑前动脉水平段(A1段)发育异常和胚胎型大脑后动脉与颅内前、后交通动脉动脉瘤形成的关系. 方法 回顾性分析216例64排CT血管成像(CTA)的资料.①将216例中CTA发现有前后交通动脉动脉瘤的126例,分为前交通动脉动脉瘤(ACoAA)组69例和后交通动脉动脉瘤(PCoAA)组57例,其余CTA检查无动脉瘤,但有头痛、头晕的90例患者,作为对照组.②分析动脉瘤的有无,动脉瘤的部位、形态、大小和瘤颈的宽度、瘤顶指向及瘤体与周围结构的关系等.③将判定结果与手术结果进行对照.④同时观察大脑前动脉A1段是否存在发育不良或缺如,是否存在胚胎型大脑后动脉. 结果 ①64排CTA共检出前、后交通动脉动脉瘤126例,其中ACoAA 69例,PCoAA57例,以DSA和手术为判断标准,64排CTA检出动脉瘤的敏感性和特异性均为100%.②ACoAA组中一侧A1段发育不良或缺如达81.7%,明显高于PCoAA组和对照组(P <0.05);PCoAA组中胚胎型大脑后动脉达56.1%,明显高于ACoAA组和对照组(P<0.05).结论 (1)64排CTA检出动脉瘤具有较高的敏感性和特异性;②一侧大脑前动脉Al段发育不良或缺如及胚胎型大脑后动脉与前、后交通动脉动脉瘤的发生密切相关.%Objective To investigate the relationship between the dysplasia of horizontal segment ( A1 segment) of anterior cerebral artery and the formation of anterior and posterior communicating artery aneurysms. Methods The data of 64-slice computed tomography angiography (CTA) of 216 patients were analyzed retrospectively. Of the 216 patients, CTA found 126 patients with aneurysm. They were di-vided into anterior communicating artery aneurysm ( ACoAA) group (n =69) and posterior communicating artery aneurysm (PCoAA)group (re =57). The other patients without aneurysm revealed by CTA but with headache and dizziness (n =90) were used as a control group. The presence or absence of aneurysm

  10. Spiral CT colonography in inflammatory bowel disease

    Energy Technology Data Exchange (ETDEWEB)

    Tarjan, Zsolt E-mail: tarjan@radi.sote.hu; Zagoni, Tamas; Gyoerke, Tamas; Mester, Adam; Karlinger, Kinga; Mako, Erno K

    2000-09-01

    Objective: Most of the studies on virtual colonoscopy are dealing with the role of detecting colorectal polyps or neoplasms. We have undertaken this study to evaluate the value of CT colonography in patients with colonic Crohn's disease. Methods and material: Five patients (three males, two females, 23-51 years, mean age 42 years) with known (4) or suspected (1) Crohn's disease of the colon underwent fiberoptic colonoscopy and CT colonography in the same day or during a 1-week period. The images were evaluated with the so called zoomed axial slice movie technique and in some regions intra- and extraluminal surface shaded and volume rendered images were generated on a separate workstation. The results were compared to those of a colonoscopy. Results: The final diagnosis was Crohn's disease in four patients and colitis ulcerosa in one. Total examination was possible by colonoscopy in two cases, and with CT colonography in all five cases. The wall of those segments severely affected by the disease were depicted by the axial CT scans to be thickened. The thick walled, segments with narrow lumen seen on CT colonography corresponded to the regions where colonoscopy was failed to pass. Air filled sinus tracts, thickening of the wall of the terminal ileum, loss of haustration pseudopolyps and deep ulcers were seen in CT colonography. Three dimensional (3D) endoluminal views demonstrated pseudopolyps similar to endoscopic images None of the colonoscopically reported shallow ulcerations or aphtoid ulcerations or granular mucosal surface were observed on 2- or 3D CT colonographic images. Conclusion: CT colonography by depicting colonic wall thickening seems to be a useful tool in the diagnosis of Crohn's colitis, which could be a single examination depicting the intraluminal, and transmural extent of the disease.

  11. Spiral CT of hypervascular liver tumors and liver transplants

    International Nuclear Information System (INIS)

    This paper evaluates the accuracy of spiral CT with bolus contrast material injection in delineation of hypervascular liver tumors and follow-up of liver transplants. Spiral CT scans were obtained on a Somatom Plus (Siemens) in 35 patients with hypervascular liver tumors (22 hepatocellular carcinoma [HCC], 8 focal nodular hyperplasia, 3 adenomas, 2 metastases) and in 80 patients with liver transplants. A contrast material bolus of 100 mL was administered with a flow of 3 mL/sec. The whole liver was investigated in one breath hold (24 seconds) with a table feed of 10 mm/sec. Images 5 mm thick were reconstructed from the data set. These images were compared with conventional incremental dynamic CT scans (contrast material bolus 100 mL; flow 1 mL/s). Spiral CT showed the whole tumor volume hyperattenuated due to the arterial hypervascularization in all 35 cases. In incremental dynamic CT, all tumors appeared hypoattenuated compared with the liver

  12. Unenhanced spiral CT in Urolithiasis: indication, performance and interpretation

    International Nuclear Information System (INIS)

    Unenhanced spiral computed tomography is now applied in the investigation of patients with acute flank pain to search for suspected urinary tract calculi. Spiral CT can depict urinary calculi more accurately than plain radiographs, sonography or excretory urography, and can be performed using a low dose protocol. Almost all urinary calculi, including calculi composed of uric acid, xanthine and cystine, can be detected. In addition to determining size and location of the stone, unenhanced helical CT can predict its composition. Furthermore, it reveals secondary signs of obstruction, such as dilatation of the renal collecting system and perinephric stranding. In the absence of urolithiasis, CT can frequently detect or exclude other causes of acute flank pain, thus guiding subsequent imaging and the therapeutic management. (orig.)

  13. The value of mental intervention in 64-line spiral CT for coronary angiography%心理干预在64排螺旋CT冠状动脉造影中的应用价值

    Institute of Scientific and Technical Information of China (English)

    孙倩; 胡修媚; 谢延平; 朱建凤

    2008-01-01

    Objective To evaluate the value of mental intervention in 64-slice spiral CT for coronary angiography. Methods 60 patients who suspected coronary artery stenosis were divided into two groups at random (the mental intervention group and the routine group, with 30 cases in each group). The quality of coronary imaging was assessed as excellent, good and bad according to ACC1999 by two experienced doctors. The results of the two groups were calculated by statistical analysis. Results The image quality of the mental intervention group includes: excellent 72 cases, good 15 cases, and bad 3 cases; and the image quality of the routine group includes: excellent 48 cases, good 12 cases, and bad 30 cases, respectively. The quality of imaging in the mental intervention group was obviously superior to the routine group, and there was significant difference between the two groups (P<0.05). Conclusions In 64-slice spiral CT for coronary angiography, mental intervention can raise the achievement ratio of examination and improve the image quality of coronary artery. It is the essential for the success of the 64-slice spiral CT coronary angiography.%目的 评价心理干预在64排螺旋CT冠状动脉造影中的应用价值.方法 将60例患者随机分为心理干预组和常规组各30例,采用双盲法由2名高年资医生参照冠状动脉标准分段法(ACC1999)对冠状动脉进行分段评价,以"优"、"良"、"差"三个级别评价冠状动脉图像质量,对两组评价结果 进行统计分析.结果 心理干预组图像质量优72例,良15例,差3例,常规组优48例,良12例,差30例,心理干预组图像质量明显优于常规组,两组间比较差异有统计学意义(P<0.05).结论 对患者进行必要的心理干预,可显著提高检查成功率和改善冠脉图像质量,是64排螺旋CT冠状动脉造影检查成功的重要保证.

  14. Spiral CT pneumocolon: applications, status and limitations.

    Science.gov (United States)

    Harvey, C J; Renfrew, I; Taylor, S; Gillams, A R; Lees, W R

    2001-01-01

    CT pneumocolon is a promising new technique in the diagnosis and management of colon pathology. CT pneumocolon can detect (sensitivity >95%) and stage (accuracy 79%) colorectal cancer and is very accurate in the differentiation of malignant from benign colonic pathologies. It has excellent detection rates for polyps >10 mm in diameter. Several studies using 3D virtual colonoscopy have already proven its high sensitivity and specificity in polyp detection making this technique robust as a screening tool. The combined results for virtual colonoscopy, from all centres, show a sensitivity of >85% in the detection of polyps 10 mm or greater in size, 70-80% for 5-9 mm polyps and an overall specificity of 90%. CT pneumocolon is a safe, non-invasive and cost-effective method for detecting colonic carcinomas and adenomas and correctly identifying which patients need further colonoscopy. The technique is quick, well tolerated and non-operator dependent. It can also image the proximal colon when distal stenoses prevent endoscopic and barium examination. CT pneumocolon is able to identify the features and complications of inflammatory bowel disease. Further research is warranted to fully assess its impact in terms of a screening tool, acceptability, availability and cost benefit.

  15. Spiral CT pneumocolon: applications, status and limitations

    Energy Technology Data Exchange (ETDEWEB)

    Harvey, C.J. [Department of Academic Imaging, University College London (United Kingdom); Department of Imaging, Hammersmith Hospital, London (United Kingdom); Renfrew, I.; Taylor, S.; Gillams, A.R.; Lees, W.R. [Department of Academic Imaging, University College London (United Kingdom)

    2001-09-01

    CT pneumocolon is a promising new technique in the diagnosis and management of colon pathology. CT pneumocolon can detect (sensitivity >95%) and stage (accuracy 79%) colorectal cancer and is very accurate in the differentiation of malignant from benign colonic pathologies. It has excellent detection rates for polyps >10 mm in diameter. Several studies using 3D virtual colonoscopy have already proven its high sensitivity and specificity in polyp detection making this technique robust as a screening tool. The combined results for virtual colonoscopy, from all centres, show a sensitivity of >85% in the detection of polyps 10 mm or greater in size, 70-80% for 5-9 mm polyps and an overall specificity of 90%. CT pneumocolon is a safe, non-invasive and cost-effective method for detecting colonic carcinomas and adenomas and correctly identifying which patients need further colonoscopy. The technique is quick, well tolerated and non-operator dependent. It can also image the proximal colon when distal stenoses prevent endoscopic and barium examination. CT pneumocolon is able to identify the features and complications of inflammatory bowel disease. Further research is warranted to fully assess its impact in terms of a screening tool, acceptability, availability and cost benefit. (orig.)

  16. Multidetector spiral CT arthrography of the shoulder

    Energy Technology Data Exchange (ETDEWEB)

    Lecouvet, Frederic E. [Departments of Radiology and Orthopaedic Surgery, Cliniques Universitaires Saint-Luc, Universite Catholique de Louvain, Hippocrate Avenue 10/2942, 1200 Brussels (Belgium)], E-mail: frederic.lecouvet@uclouvain.be; Simoni, Paolo; Koutaissoff, Sophie; Vande Berg, Bruno C.; Malghem, Jacques; Dubuc, Jean-Emile [Departments of Radiology and Orthopaedic Surgery, Cliniques Universitaires Saint-Luc, Universite Catholique de Louvain, Hippocrate Avenue 10/2942, 1200 Brussels (Belgium)

    2008-10-15

    Although MR imaging and MR arthrography are the first choice modalities for shoulder imaging, CT arthrography (CTA) may be used successfully to address many clinical questions. The advent of submillimeter multiple detector CT technology and subsequent excellent three-plane resolution has considerably increased the quality of CTA examinations and has propelled this technique to the forefront in a growing number of indications. The combined use of iodinated contrast material for fluoroscopic confirmation of the articular position of the needle before injection of gadolinium chelates for MR arthrography offers the unique opportunity to compare CTA and MRA findings in carefully selected cases. This paper illustrates capabilities and limits of CTA for the study of rotator cuff tears, shoulder instability, cartilage lesions, anatomical variants and abnormalities of the glenoid labrum, with correlations to MR arthrography and surgical findings.

  17. Multidetector spiral CT arthrography of the shoulder

    International Nuclear Information System (INIS)

    Although MR imaging and MR arthrography are the first choice modalities for shoulder imaging, CT arthrography (CTA) may be used successfully to address many clinical questions. The advent of submillimeter multiple detector CT technology and subsequent excellent three-plane resolution has considerably increased the quality of CTA examinations and has propelled this technique to the forefront in a growing number of indications. The combined use of iodinated contrast material for fluoroscopic confirmation of the articular position of the needle before injection of gadolinium chelates for MR arthrography offers the unique opportunity to compare CTA and MRA findings in carefully selected cases. This paper illustrates capabilities and limits of CTA for the study of rotator cuff tears, shoulder instability, cartilage lesions, anatomical variants and abnormalities of the glenoid labrum, with correlations to MR arthrography and surgical findings

  18. Reduction of patient radiation dose in Spiral CT scan

    International Nuclear Information System (INIS)

    To optimize patient radiation dose in Spiral CT scan of dento-maxillo-facial region by measuring the absorbed dose in the phantom and to evaluate reliability of dose estimation methods using CTDI (CT Dose Index, FDA, USA). Spiral CT scanning with 'pitchs' (ratio of table speed to slice thickness per rotation) more than 1 was used for dose measurements. The dose was measured using a human phantom (Alderson Research Laboratories, USA) in the CT scan with a 3rd generation CT scanner of Somatom Plus (Siemens, Germany) for bone imaging. CTDI for this CT scanner were 9.2 mGy/100 mA at the center in an acrylic resin phantom with diameter of 16 cm and 8.5 mGy/100 mA at 1 cm depth from the phantom surface. X-ray tube voltage of 120 kV and tube current of 85 mA was used. Slice thickness was varied from 1 to 3 mm and table speed per rotation was also varied from 1 to 5 mm per rotation. X-Omat-V (Eastman Kodak, USA) films and TLD (Thermo-Luminescent-Dosimetry) dosimeters of the type of MSO-S (Kyokko, Japan) were used in the dosimetry. Patients radiation dose reduced with increasing the pitch of SPIRAL scan. Measured dose was uniformly distributed and well corresponded to the dose calculated using CTDI. However, measured doses on scanning with 1 mm slice thickness were always higher than those with 2 to 5 mm slice thickness. The lowest radiation dose was obtained with scanning with 2 mm slice thickness and table speed of 4 mm per rotation which give the dose of about 4 mGy per one CT examination in the imaged tissues. The highest dose per one CT examination was measured in 'dental CT' for the mandibular region with 1 mm slice thickness and table speed of 1 mm per rotation which gave 12 mGy by film dosimetry and 9 mGy by TLD dosimetry. SPIRAL scan with pitch more than 1 was effective for reduction of patient radiation dose without reducing the image quality. CTDI was also useful to estimate the dose except scans with 1 mm slice thickness. (author)

  19. Spiral CT in the diagnosis of acute pulmonary embolism

    Energy Technology Data Exchange (ETDEWEB)

    Hartmann, I.J.C.; Prokop, M. [Univ. Medical Center Utrecht, Utrecht (Netherlands)

    2002-07-01

    The traditional approach in patients with clinically suspected pulmonary embolism includes ventilation-perfusion (V/Q) scintigraphy as the first step. This relatively fast and noninvasive technique allows diagnosis or exclusion of pulmonary embolism in a considerable proportion of patients. However, depending on the patient group and evaluation criteria, the results of the V/Q lung scan are nondiagnostic in 40 to 70% of cases. Further testing is needed because pulmonary embolism will be present in only about a quarter of these patients. In order to find a non-invasive strategy for the diagnostic work-up of PE, several promising developments have been made, e.g. D-dimer analysis and spiral CT angiography. Both techniques are fast, noninvasive, and easy to perform and are now conquering the medical world. In this overview we will focus on Spiral CT: what is its role now and what might be expected in the near future? (orig.)

  20. Spiral CT in the diagnosis of acute pulmonary embolism

    International Nuclear Information System (INIS)

    The traditional approach in patients with clinically suspected pulmonary embolism includes ventilation-perfusion (V/Q) scintigraphy as the first step. This relatively fast and noninvasive technique allows diagnosis or exclusion of pulmonary embolism in a considerable proportion of patients. However, depending on the patient group and evaluation criteria, the results of the V/Q lung scan are nondiagnostic in 40 to 70% of cases. Further testing is needed because pulmonary embolism will be present in only about a quarter of these patients. In order to find a non-invasive strategy for the diagnostic work-up of PE, several promising developments have been made, e.g. D-dimer analysis and spiral CT angiography. Both techniques are fast, noninvasive, and easy to perform and are now conquering the medical world. In this overview we will focus on Spiral CT: what is its role now and what might be expected in the near future? (orig.)

  1. Influence of coronary calcification on the diagnostic accuracy of 64-slice computed tomography coronary angiography

    DEFF Research Database (Denmark)

    Abdulla, Jawdat; Pedersen, Kasper; Budoff, Matthew;

    2012-01-01

    To determine via meta-analysis the diagnostic accuracy of 64-slice computed tomography coronary angiography (CTA) for assessment of significant obstructive coronary artery stenosis at different coronary artery calcium score (CACS) levels. Data of 12,053 versus 5,890 segments, 906 versus 758 arter...

  2. Application of 64-slice spiral computed tomography in measurement of simulated puncture channels of intrahepatic portosystemic shunt%64层螺旋CT在肝内门腔分流模拟穿刺途径测量中的应用

    Institute of Scientific and Technical Information of China (English)

    王剑华; 周庭永; 吕发金; 张琳; 刘本菊; 张本斯; 张志伟

    2009-01-01

    Objective To offer clinical applicable information on morphology by means of measurement of the simulated puncture channel of the right portal branch at 1 and 2 cm and venae hepaticae intermediae and right hepatic veins at 1,2, and 3 cm in patients without liver diseases and those with cirrhosis Child-Pugh grade A and B. Methods Abdominal 64-MSCT scan was performed in 40 cases without liver diseases and 14 cases of cirrhosis after the test of the celiac levels of abdominal aorta was conducted by the smart tracking technology (Smart Prep). The data were processed for imaging on the GE ADW4.2 workstation. Rosults Significant difference was found between the normal group and cirrhosis Child-Pugh grade A and B groups, φMHV1, φRHV1 (P <0.05). The diameter of the normal right hepatic vein at 1-2 cm and that of the middle hepatic vein at 1-2 cm decreased rapidly as compared with that of cirrhosis Child-Pugh grade A and B groups. There was also significant difference (P<0.05) between the normal and cirrhosis Child-Pugh grade A and B groups in the simulated puncture channels of DMHV2-RPV1, DMHV3-RPV1, DMHV3-RPV2, and DRHV1-RPV1. Conclusion 64-MSCT and the three-dimensional reconstruction may be an effective way for accurate measure-ment of the intrinsic liver vessels in vivo. The study of the simulated intrahepatic portosystemic shunt can help to choose the appropriate length and type of the stents.%目的 通过64层螺旋CT(64-MSCT)对非肝病患者及肝硬化Child-Pugh A、B分级组患者门静脉右支1、2 cm处与肝中静脉、肝右静脉1、2、3 cm间模拟穿刺途径进行测量.方法 选取上腹部64-MSCT扫描非肝病被检查组共40例;肝硬化组符合纳入标准14例.用智能追踪技术启动扫描,在GE ADW4.2工作站进行处理.结果 正常组与肝硬化Child-Push A、B分级组φMHV1、φRHV1有统计学差异(P<0.05).正常组肝右静脉1~2 cm处及肝中静脉1~2 cm处直径较肝硬化Child-Pugh A、B分级组减小迅

  3. 3D Reconstruction in Spiral Multislice CT Scans

    Directory of Open Access Journals (Sweden)

    M. Ghafouri

    2005-08-01

    Full Text Available Introduction & Background: The rapid development of spiral (helical computed tomography (CT has resulted in exciting new applications for CT. One of these applications, three-dimensional (3D CT with volume ren-dering, is now a major area of clinical and academic interest. One of the greatest advantages of spiral CT with 3D volume rendering is that it provides all the necessary information in a single radiologic study (and there-fore at the lowest possible price in cases that previously required two or more studies. Three-dimensional vol-ume rendering generates clinically accurate and immediately available images from the full CT data set with-out extensive editing. It allows the radiologist and clinician to address specific questions concerning patient care by interactively exploring different aspects of the data set. Three-dimensional images integrate a series of axial CT sections into a form that is often easier to interpret than the sections themselves and can be made to appear similar to other more familiar images such as catheter angiograms. The data are organized into a 3D matrix of volume elements (voxels. The screen of the computer monitor is a 2D-surface composed of discrete picture elements (pixels. Presenting what is stored in memory (ie, floating within the monitor on a 2D-screen is a challenge, but it is the very problem that 3D reconstruc-tion software has creatively solved. Voxel selection is usually accomplished by projecting lines (rays through the data set that correspond to the pixel matrix of the desired 2D image. Differences in the images produced with various 3D rendering techniques are the result of variations in how voxels are selected and weighted. In this article, I compare 3D volume rendering of spiral CT data with other rendering techniques (shaded surface display, maximum intensity projection and present a brief history of 3D volume rendering and discuss the im-plementation of this promising technology in terms of

  4. Three-dimensional spiral CT for neurosurgical planning

    Energy Technology Data Exchange (ETDEWEB)

    Klein, H.M. (Dept. of Neurosurgery, Technical Univ., Aachen (Germany)); Bertalanffy, H. (Dept. of Neurosurgery, Technical Univ., Aachen (Germany)); Mayfrank, L. (Dept. of Neurosurgery, Technical Univ., Aachen (Germany)); Thron, A. (Dept. of Neuroradiology, Technical Univ., Aachen (Germany)); Guenther, R.W. (Dept. of Diagnostic Radiology, Technical Univ., Aachen (Germany)); Gilsbach, J.M. (Dept. of Neurosurgery, Technical Univ., Aachen (Germany))

    1994-08-01

    We carried out 22 examinations to determine the value of three-dimensional (3D) volumetric CT (spiral CT) for planning neurosurgical procedures. All examinations were carried out on a of the first generation spiral CT. A tube model was used to investigate the influence of different parameter settings. Bolus injection of nonionic contrast medium was used when vessels or strongly enhancing tumours were to be delineated. 3D reconstructions were carried out using the integrated 3D software of the scanner. We found a table feed of 3 mm/s with a slice thickness of 2 mm and an increment of 1 mm to be suitable for most purposes. For larger regions of interest a table feed of 5 mm was the maximum which could be used without blurring of the 3D images. Particular advantages of 3D reconstructed spiral scanning were seen in the planning of approaches to the lower clivus, acquired or congenital bony abnormalities and when the relationship between vessels, tumour and bone was important. (orig.)

  5. 64层VCT首过期灌注成像对肺部结节的诊断价值%First pass phase of perfusion imaging with 64-slice VCT in diagnosis of pulmonary nodules

    Institute of Scientific and Technical Information of China (English)

    舒圣捷; 黄晗; 刘白鹭; 王非; 赵雁鸣; 申秀芬

    2011-01-01

    Objective: To evaluate the diagnostic ability of first pass phase of perfusion imaging with 64-slice VCT between benign and malignant pulmonary nodules. Methods; A total of 108 patients with pulmonary nodules underwent perfusion scan with 64 slice spiral CT scanner. The parameters of CT perfusion. Including blood volume (BV), blood flow (BF). Mean transit time (MTT). Permeability surface (PS). And time-density curve (TDC). Were analyzed. The CT perfusion and enhanced parameters were compared with vascular endothelial growth factor (VEGF) expression by immunohis-tochemistry. Results: These parameter values in pulmonary malignancy nodules were highter than those in pulmonary benign nodules. The TDC appeared different for malignant and benign nodules. Conclusion: Perfusion CT can provide quantitative information about blood flow perfusion of nodules and it is meaningful to the diagnosis and differential diagnosis of pulmonary nodules.%目的:探讨首过期的64层VCT肺灌注成像对肺部结节的诊断意义.方法:对108例肺结节患者进行CT灌注扫描,测定肺结节的时间-密度曲线(TDC)、血容积(BV)、血流量(BF)、平均通过时间(MTT)和表面通透性(PS)的数值,并测量肺结节增强前的CT值、增强值和结节-动脉增强值之比(S/A).标定结节的血管内皮生长因子(VEGF),评价肺结节CT灌注和增强指数与VEGF表达的相关性.结果:肺癌的灌注指数高于肺良性结节.良、恶性结节的TDC形态不同.结论:CT肺灌注成像可定量的评价肺结节的血流灌注特点,对肺部结节有较大的诊断及鉴别诊断意义.

  6. Low kV CT pulmonary angiography at 64-slice CT for standard body type:a feasibility study%对标准体型病人行低管电压CT肺动脉成像的可行性研究

    Institute of Scientific and Technical Information of China (English)

    赵磊; 杨晓光; 包丽丽; 刘挨师

    2016-01-01

    Objebtive The purpose of this study was to compare image quality and radiation dose between low voltage CT pulmonary angiography (CTPA) and conventional CTPA protocols in patients of standard body type. Methods 60 consecutive patients with low body mass index (≤25 kg/m2) and low body mass (≤80 kg) suspected having pulmonary embolism (PE) were prospectively enrolled from February 2013 to August 2014. The patients were divided into two groups. Tube voltage was set at 80 Kv for group A and 120 Kv for group B. Tube current settings were determined by testing bolus peak attenuation. Radiation dose and image quality were compared between the two groups. The relationship between image quality parameter and radiation dose measured at pulmonary artery trunk were analyzed with Pearson correlation. Results The total pulmonary arteries showed significantly higher attenuation and noise in group A than in group B (P=0.000). The total signal-to-noise ratio and total contrast-to-noise ratio did not significantly differ between groups A and B (P=0.187, P=0.309, respectively). The mean effective dose showed significantly lower in group A than in group B (1.69±0.43 mSv vs 5.63± 1.84 mSv, P=0.000). The attenuation or noise and effective dose was negatively correlated. Conclusion Using 80 Kv-CTPA can achieve stable image quality with reduced effective radiation dose compared with 120 Kv-CTPA in patients with low body mass index (≤25 kg/m2) and low body mass (≤80 kg).%目的 通过对比低管电压CT肺动脉成像(CTPA)与常规CTPA的影像质量与辐射剂量,从而评价低管电压CTPA应用于标准体型病人的临床价值.方法 前瞻性选取我院2013年2月-2014年8月标准体型(体质量指数≤25 kg/m2,体质量≤80 kg)病人60例,并随机分为2组.A、B两组管电压分别设置为80 Kv和120 Kv.管电流设置基于循环时间测试峰值.评价并对比A、B两组影像质量与辐射剂量,选取肺动脉干影像质量参数与辐射剂

  7. Beam hardening artifacts by dental implants: Comparison of cone-beam and 64-slice computed tomography scanners

    Directory of Open Access Journals (Sweden)

    Farzad Esmaeili

    2013-01-01

    Full Text Available Background: Cone beam computed tomography (CBCT is an alternative to a computed tomography (CT scan, which is appropriate for a wide range of craniomaxillofacial indications. The long-term use of metallic materials in dentistry means that artifacts caused by metallic restorations in the oral cavity should be taken into account when utilizing CBCT and CT scanners. The aim of this study was to quantitatively compare the beam hardening artifacts produced by dental implants between CBCT and a 64-Slice CT scanner. Materials and Methods: In this descriptive study , an implant drilling model similar to the human mandible was used in the present study. The implants (Dentis were placed in the canine, premolar and molar areas. Three series of scans were provided from the implant areas using Somatom Sensation 64-slice and NewTom VGi (CBCT CT scanners. Identical images were evaluated by three radiologists. The artifacts in each image were determined based on pre-determined criteria. Kruskal-Wallis test was used to compare mean values; Mann-Whitney U test was used for two-by-two comparisons when there was a statistical significance ( P < 0.05. Results: The images of the two scanners had similar resolutions in axial sections ( P = 0.299. In coronal sections, there were significant differences in the resolutions of the images produced by the two scanners ( P < 0.001, with a higher resolution in the images produced by NewTom VGi scanner. On the whole, there were significant differences between the resolutions of the images produced by the two CT scanners ( P < 0.001, with higher resolution in the images produced by NewTom VGi scanner in comparison to those of Somatom Sensation. Conclusion: Given the high quality of the images produced by NewTom VGi and the lower costs in comparison to CT, the use of the images of this scanner in dental procedures is recommended, especially in patients with extensive restorations, multiple prostheses and previous implants.

  8. Intracranial aneurysms: evaluation in 200 patients with spiral CT angiography

    International Nuclear Information System (INIS)

    The goal of this study was to assess the usefulness of spiral CT angiography (CTA) with three- dimensional reconstructions in defining intracranial aneurysms, particularly around the Circle of Willis. Two hundred consecutive patients with angiographic and/or surgical correlation were studied between 1993 and 1998, with CTA performed on a GE HiSpeed unit and Windows workstation. The following clinical situations were evaluated: conventional CT suspicion of an aneurysm; follow-up of treated aneurysm remnants or of untreated aneurysms; subarachnoid haemorrhage (SAH) and negative angiography; family or past aneurysm history; and for improved definition of aneurysm anatomy. Spiral CTA detected 140 of 144 aneurysms, and an overall sensitivity of 97%, including 30 of 32 aneurysms 3 mm or less in size. In 38 patients with SAH and negative angiography, CTA found six of the seven aneurysms finally diagnosed. There was no significant artefact in 17 of 23 patients (74%) with clips. The specificity of CTA was 86% with 8 false-positive cases. Spiral CTA is very useful in demonstrating intracranial aneurysms. (orig.)

  9. Three-dimensional spiral CT of craniofacial malformations in children

    Energy Technology Data Exchange (ETDEWEB)

    Binaghi, S. [Payerne Hopital, Lausanne (Switzerland). Dept. of Radiology; Service de Radiodiagnostic et Radiologie Interventionnelle, Lausanne (Switzerland); Gudinchet, F. [Payerne Hopital, Lausanne (Switzerland). Dept. of Radiology; Rilliet, B. [Dept. of Neurosurgery, University Hospital of Lausanne (Switzerland)

    2000-12-01

    Objective. To assess the value of three-dimensional CT (3D CT) in the diagnosis and management of suspected paediatric craniofacial malformations. Materials and methods. Twenty-eight children (12 girls, 16 boys) with a mean age of 4 years, suffering from craniofacial or cervical malformations, underwent craniofacial spiral CT. 3D reformatting was performed using an independent workstation. Results. 3D CT allowed the preoperative evaluation of 16 patients with craniosynostosis and the post-surgical management of 2 patients. 3D CT clearly depicted malformations of the skull base involving the petrous bone in seven patients (four cases of Goldenhar-Gorlin syndrome, one case of Treacher-Collins syndrome and two cases of Crouzon's disease). Four patients with craniofacial clefts were also evaluated. Radiological findings were confirmed by the clinical and intraoperative findings in all patients that underwent surgical treatment. Movement artefacts and ''Lego effect'' related to abrupt change of cranial vault border were encountered and are discussed. Conclusions. 3D CT of the skull can safely and reliably identify paediatric craniofacial malformations involving bone, and it should be used as morphological mapping to help the surgeon in planning surgical treatment. (orig.)

  10. Radiation exposure with spiral CT of the paranasal sinuses; Strahlenexposition bei der Spiral-CT der Nasennebenhoehlen

    Energy Technology Data Exchange (ETDEWEB)

    Dammann, F.; Momino-Traserra, E.; Remy, C.; Claussen, C.D. [Radiologische Universitaetsklinik Tuebingen (Germany). Abt. fuer Radiologische Diagnostik; Pereira, P.L.; Baumann, I.; Koitschev, A. [Universitaetsklinik Tuebingen (Germany). Klinik fuer Hals-Nasen-Ohrenheilkunde

    2000-03-01

    Purpose: Determination of the radiation doses in spiral CT of the paranasal sinuses using a variety of mAs values and scan protocols. Material and methods: CT examinations of the paranasal sinuses were performed using an Alderson-Rando phantom. Radiation dose was determined by LiF-TLD at the level of high risk organs in the head and neck region for combinations of different scan parameters (2/3, 3/3, 3/4 mm) and decreasing charges (200, 150, 100, 50, 25 mAs) on a spiral CT. Additional measurements were performed on three other CT scanners using the 2/3 mm protocol at 50 mAs, and a single slice technique (5/5 mm) on one scanner. Results: The lowest dose values found were 1.88 mGy for the eye lenses, 1.35 mGy for the parotid gland, 0.03 mGy for the thyroid gland and 0.1 mGy for the medulla oblongata using 2 mm collimation and 3 mm table feed at 25 mAs. Maximal dose values resulted using the 3/3 mm protocol at 200 mAs (31.00 mGy for the eye lense, 0.65 mGy for the thyroid gland). There were no significant differences found between the different CT scanners. Conclusions: Using up-to-date CT scanners, radiation exposure may be reduced by a factor of 15-20 compared to that of conventional CT technique. Thus, the exposure of the eye lens comes to only a thousandth of the value supposedly inducing a cataract, as published by the ICRP. (orig.) [German] Ziel: Systematische Erfassung der Strahlenexposition bei der Spiral-CT der Nasennebenhoehlen bei unterschiedlichen Dosen und Scanprotokollen. Material und Methoden: Am Alderson-Rando-Phantom wurden die Dosen an Risikoorganen im Kopf-Halsbereich mittels LiF-TLD-Sonden fuer Kombinationen aus unterschiedlichen Scanparametern (2/3, 3/3, 3/4 mm) und absteigender Ladung (200, 150, 100, 50, 25 mAs) an einem Spiral-CT gemessen. Zusaetzlich wurden Messungen an drei weiteren CT-Geraeten mit dem 2/3-Protokoll bei 50 mAs sowie an einem dieser Geraete im Einzelschicht-Modus mit 5/5 mm durchgefuehrt. Ergebnisse: Die niedrigsten Dosen

  11. Spiral CT in gastric carcinoma: Comparison with barium study,fiberoptic gastroscopy and histopathology

    Institute of Scientific and Technical Information of China (English)

    Feng Chen; Yi-Cheng Ni; Kai-Er Zheng; Sheng-Hong Ju; Jun Sun; Xi-Long Ou; Man-Hua Xu; Hao Zhang; Guy Marchal

    2003-01-01

    AIM: To evaluate spiral computed tomography (CT) including virtual gastroscopy for diagnosis of gastric carcinoma in comparison with upper gastrointestinal series (UGI),fiberoptic gastroscopy (FG) and histopathology.METHODS: Sixty patients with histologically proven gastric carcinoma (54 advanced and 6 early) were included in this study. The results of spiral CT were compared with those of UGI and FG. Two observers blindly evaluated images of spiral CT and UGI and video recording of FG with consensus in terms of diagnostic confidence with a five-point scale.Sensitivities of lesion detection, Borrmann′s classification of spiral CT, UGI and FG, as well as the accuracy of TNM staging of spiral CT were determined by comparing them to surgical and histological findings.RESULTS: The lesion detection rate was 98 % (59/60),95 % (57/60) and 98 % (59/60) for spiral CT, UGI and FG,respectively. There were no statistical differences in the detection sensitivity among the three techniques (P>0.05).For the sensitivity in Borrmann′s classification, spiral CT was higher than that of UGI (P=0.025) and similar to that of FG (P>0.05). The accuracy of spiral CT in staging the gastric carcinoma was 76.7 %. Six cases of early gastric carcinoma were all detected by spiral CT as well as FG.CONCLUSION: Spiral CT is equivalent to UGI and FG in the detection of gastric carcinoma, and superior to UGI but similar to FG in the Borrmann′s classification of advanced gastric carcinoma. Spiral CT is more valuable than FG in the staging of gastric carcinoma.

  12. Coronary calcium score as gatekeeper for 64-slice computed tomography coronary angiography in patients with chest pain: per-segment and per-patient analysis

    Energy Technology Data Exchange (ETDEWEB)

    Palumbo, Anselmo Alessandro; Cademartiri, Filippo [Azienda Ospedaliero-Universitaria di Parma, Non-Invasive Cardiovascular Imaging, Department of Radiology and Cardiology, Parma (Italy); Erasmus Medical Center, Department of Radiology and Cardiology, Rotterdam (Netherlands); Maffei, Erica; Martini, Chiara [Azienda Ospedaliero-Universitaria di Parma, Non-Invasive Cardiovascular Imaging, Department of Radiology and Cardiology, Parma (Italy); Tarantini, Giuseppe [University of Padua, Department of Cardiology, Padua (Italy); Di Tanna, Gian Luca; Berti, Elena; Grilli, Roberto [Regional Health Agency, Regione Emilia Romagna, Bologna (Italy); Casolo, Giancarlo [Ospedale Versilia, Department of Cardiology, Viareggio (Italy); Brambilla, Valerio [Don Gnocchi ONLUS, Cardiovascular Rehabilitation Unit, Parma (Italy); Cerrato, Marcella; Rotondo, Antonio [University of Naples, Department of Radiology, Naples (Italy); Weustink, Annick C.; Mollet, Nico R.A. [Erasmus Medical Center, Department of Radiology and Cardiology, Rotterdam (Netherlands)

    2009-09-15

    We sought to investigate the performance of 64-slice CT in symptomatic patients with different coronary calcium scores. Two hundred patients undergoing 64-slice CT coronary angiography for suspected coronary artery disease were enrolled into five groups based on Agatston calcium score using the Mayo Clinic risk stratification: group 1: score 0, group 2: score 1-10, group 3: score 11-100, group 4: score 101-400, and group 5: score > 401. Diagnostic accuracy for the detection of significant ({>=}50% lumen reduction) coronary artery stenosis was assessed on a per-segment and per-patient base using quantitative coronary angiography as the gold standard. For groups 1 through 5, sensitivity was 97, 96, 91, 90, 92%, and specificity was 99, 98, 96, 88, 90%, respectively, on a per-segment basis. On a per-patient basis, the best diagnostic performance was obtained in group 1 (sensitivity 100% and specificity 100%) and group 5 (sensitivity 95% and specificity 100%). Progressively higher coronary calcium levels affect diagnostic accuracy of CT coronary angiography, decreasing sensitivity and specificity on a per-segment base. On a per-patient base, the best results in terms of diagnostic accuracy were obtained in the populations with very low and very high cardiovascular risk. (orig.)

  13. Clinical application of low-dose spiral CT for orthodontics

    International Nuclear Information System (INIS)

    Objective: To determine the effect of reducing the value of mA or kV on the image quality and the radiation dose of the patients undergoing low-dose spiral CT for orthodontics. Methods: Thirty patients were divided into three groups, each group has 10 patients. They were group 1 (80 kV and 200 mA), group 2 (120 kV and 80 mA), group 3 (120 kV and 200 mA) The volume CT dose index (CTDI) was recorded and the average dose-length produce (DLP) was calculated in three groups,respectively. Image quality of three groups were compared and scored by two radiologists, and the results were statistically analysed. Results: The CTDI and DLP of 80 kV group (group 2) were 8.7 mGy and (36.80 ± 3.60) mGy · cm, respectively, those of 80 mA group (group 3) were 19.6 mGy and (82.14 ± 7.18) mGy · cm, respectively, and those of conventional-dose group (group 1) were 19.6 mGy and (82.14 ± 7.18) mGy · cm, respectively. There was no significant difference among three groups in diagnostic image quality. Conclusions: Low-dose spiral CT for orthodontics, especially the low-kV scan, may decrease the radiation exposure and guarantee the image quality. (authors)

  14. Preoperative and postoperative evaluation of the abdominal aortic aneurysms by spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Yamazumi, Kensuke; Okumura, Hiroshi; Toshinaga, Ryuichi; Takenoshita, Mitsuru; Ojiro, Masataka; Aikou, Takashi [Kagoshima Univ. (Japan). Faculty of Medicine; Yamazumi, Mami; Makino, Masaoki

    1996-02-01

    Twenty patients with abdominal aortic aneurysm (AAA), all of which were replaced with a Y-tube graft surgically, were studied using spiral CT to evaluate its availability for the preoperative diagnosis or postoperative course. In all cases, both two-dimensional CT and three-dimensional CT angiography were obtained at a time with one spiral scan during a single breath hold. The spiral CT scanners provided not only the reliable information about AAA including the size of the aortic lumen, the amount and location of mural thrombus and extent of an aneurysm as well as ultrasound (US), but also the major aortic branches, blood flow and construct images that look like conventional angiograms. Especially, spiral CT was more useful for the diagnosis of an aneurysm or occlusive disease of the iliac artery which was accompanied with AAA, when compared with US or intra-venous digital subtraction angiograms. On the other hand, the anastomosis in all cases including the reconstruction of the inferior mesenteric artery and the grafts could be identified and evaluated by spiral CT after surgical treatment. With regard to the distal anastomosis of the graft, spiral CT was more beneficial for the images than US. These results show that spiral CT is a non-invasive and powerful modality both for the preoperative diagnosis and the postoperative follow-up. (author).

  15. Helical CT defecography; La defecografia con Tomografia Computerizzata spirale

    Energy Technology Data Exchange (ETDEWEB)

    Ferrando, R.; Fiorini, G.; Beghello, A.; Cicio, G.R.; Derchi, L.E.; Consigliere, M.; Resasco, M. [Genua Univ., Genua (Italy). Ist. di Radiologia, Cattedra R; Tornago, S. [Genua Univ. Genua (Italy). 2 Clinica Ortopedica

    1999-11-01

    The purpose of this work is to investigate the possible role of Helical CT defecography in pelvic floor disorders by comparing the results of the investigations with those of conventional defecography. The series analyzed consisted of 90 patients, namely 62 women and 28 men, ranging in age 24-82 years. They were all submitted to conventional defecography, and 18 questionable cases were also studied with Helical CT defecography. The conventional examination was performed during the 4 standard phases of resting, squeezing, Valsalva and straining; it is used a remote-control unit. The parameters for Helical CT defecography were: 5 mm beam collimation, pitch 2, 120 KV, 250 m As and 18-20 degrees gantry inclination to acquire coronal images of the pelvic floor. The rectal ampulla was distended with a bolus of 300 mL nonionic iodinated contrast agent (dilution: 3g/cc). The patient wore a napkin and was seated on the table, except for those who could not hold the position and were thus examined supine. Twenty-second helical scans were performed at rest and during evacuation; multiplanar reconstructions were obtained especially on the sagittal plane for comparison with conventional defecographic images. Coronal Helical CT defecography images permitted to map the perineal floor muscles, while sagittal reconstructions provided information on the ampulla and the levator ani. To conclude, Helical CT defecography performed well in study of pelvic floor disorders and can follow conventional defecography especially in questionable cases. [Italian] Scopo di questo lavoro e' ricercare un ruolo per la defeco-TC con apparecchiatura elicoidale nello studio delle malattie del pavimento pelvico confrontandola con i risultati consolidati della defecografia tradizionale. Si sono visionati 90 pazienti, 62 femmine e 28 maschi, con eta' compresa tra 24 e 82 anni, con defecografia tradizionale; di questi, 18 casi con diagnosi dubbia sono stati studiati anche con defeco-TC spirale

  16. Role of spiral CT in the diagnostic work-up of acute and chronic pulmonary embolism

    International Nuclear Information System (INIS)

    With the more widespread availability of spiral CT scanners during the last five years spiral CT angiography of the pulmonary arteries has been etablished as an accurate test for acute and chronic pulmonary embolism. It is reliable in the direct visualization of thrombotic material down to the segmental level. In several studies, sensitivity and specificity of 80 to 100% as compared with pulmonary angiography were reported. Compared with scintigraphy and echocardiography, spiral CT more often provides a definite and certain diagnosis. In addition to the direct visualization of the emboli spiral CT shows vessel wall thickening as a sign of older emboli, infarction, pneumonia, pleural effusion. Differential diagnoses are depicted significantly more frequent compared with scintigraphy. In chronic thromboembolic disease spiral CT detects vessel wall alterations even more often than angiography. Additionally, spiral CT demonstrates typical changes due to pulmonary hypertension and right heart failure. Depending on the experience of the investigator and the local conditions, spiral CT is equally well suited for further work-up of indeterminate scintigraphic findings or as a primary screening tool for patients in whom pulmonary embolism is suspected. (orig./MG)

  17. 永存三叉动脉的多层螺旋CT诊断%Multislice Spiral CT Diagnosis of Persistent Trigeminal Artery

    Institute of Scientific and Technical Information of China (English)

    陈德强; 张艳春

    2012-01-01

    目的 探讨多层螺旋CT血管成像(CTA)在诊断永存三叉动脉(PTA)中的价值.资料与方法 回顾性分析2546例行头颅64层螺旋CTA检查者中的10例PTA患者的影像学资料,分析PTA的发生率、起源、走行、后循环供血及合并其他血管畸形的情况.结果 (1)PTA的发生率为0.39%( 10/2546),其中1例位于右侧,9例位于左侧.(2)三叉动脉均起自颈内动脉海绵窦段,血管走行外侧型8例,中央型2例;按Saltzman分型显示PTA后循环供血情况:Ⅰ型7例,Ⅱ型1例,Ⅲ型2例.(3)吻合点近端的基底动脉及双侧椎动脉发育不良7例.结论 64层CTA能清晰、准确地显示PTA的走行及后循环供血情况.%Objective To assess the value of multislice spiral CT angiography in the diagnosis of persistent trigeminal artery. Materials and Methods The imaging data of 10 patients with persistent trigeminal artery in 2546 patients who received 64 slice CTA of craniocervical arteries were analyzed retrospectively. The incidence,origin,running,and blood supply from posterior circulation of persistent trigeminal artery, and its complicated other vascular malformations were analyzed. Results (1 )The incidence of persistent trigeminal artery was 0. 39% (10/2546). One of them was on the right side and nine were on the left side. (2 ) All the trigeminal arteries originated from the cavernous segment of internal carotid artery. Eight patients were lateral type and two patients were central type. According to Saltzman' s classification about the blood supply from posterior circulation:seven patient was Saltzman type Ⅰ,one was type Ⅱ ,and two were type HI. (3)Seven patients had basilar artery and bilateral vertebral artery hypoplasia at the point of proximal anastomosis. Conclusion 64 slice CTA can clearly display the running route of persistent trigeminal artery and its blood supply of posterior circulation.

  18. 螺旋CT尿路成像在上尿路梗阻性病变的运用及诊断价值%Application Value of Spiral CT Urography in Diagnosis of Upper Urinary Tract Obstruction Diseases

    Institute of Scientific and Technical Information of China (English)

    李亭; 郭春梅; 王成龙; 李真林; 张洪静; 伍兵

    2011-01-01

    Objective To discuss the utilization and diagnostic value of 64-slice spiral CT urography for upper urinary tract obstruction diseases.Methods We collected the clinical data of 132 patients who were diagnosed with upper urinary tract obstruction by 64-slice spiral CT urography between December 2009 and January 2011.We analyzed the imaging features and compared them with surgical and pathological results.Results Confirmed by surgical and pathological results, 132 patients included 31 cases of urethral stone, 51 cases of congenital variant and malformation, 16 cases of ureteral infection, 29 cases of tumors in urinary tract, 3 cases of extraneous compression,and 2 cases of cysts next to the renal pelvis.CT diagnosis for all cases were basically in line with clinical and pathological results.Conclusion CT urography is an extremely valuable imaging method to diagnose the diseases of urinary system.It can display lesions broadly and reveal their inner and peripheral circumstances clearly, thus can help us determine the reasons and natures of the lesions precisely.%目的 探讨64层螺旋CT尿路造影在上尿路梗阻性病变中的运用及诊断价值.方法 收集2009年12月-2011年1月132例行螺旋CT尿路造影,并确诊为上尿路梗阻病变患者资料,分析其图像特点并与手术及病理结果对比.结果 132例患者经临床及手术病理证实,输尿管结石31例,先天异常及畸形51例,输尿管感染性病变16例,尿路肿瘤29例,外源性压迫3例,肾盂旁囊肿2例;所有患者均显示良好,与临床及病理结果基本吻合.结论 CT尿路造影能多方位清楚显示病变内部及周围情况,可准确的显示、判断尿路梗阻的原因、性质,是一种对泌尿系疾病诊断极有价值的影像学检查方法.

  19. Cardiac carcinoid: tricuspid delayed hyperenhancement on cardiac 64-slice multidetector CT and magnetic resonance imaging.

    LENUS (Irish Health Repository)

    Martos, R

    2012-02-01

    INTRODUCTION: Carcinoid heart disease is a rare condition in adults. Its diagnosis can be easily missed in a patient presenting to a primary care setting. We revised the advantages of using coronary multidetector computed tomography (MDCT) and cardiac magnetic resonance imaging (MRI) in diagnosing this condition. MATERIALS AND METHODS: We studied a 65-year-old patient with carcinoid heart disease and right heart failure using transthoracic Doppler-echocardiogram, cardiac MDCT and MRI. Cardiac echocardiogram revealed marked thickening and retraction of the tricuspid leaflets with dilated right atrium and ventricle. Cardiac MDCT and MRI demonstrated fixation and retraction of the tricuspid leaflets with delayed contrast hyperenhancement of the tricuspid annulus. CONCLUSION: This case demonstrates fascinating imaging findings of cardiac carcinoid disease and highlights the increasing utility of contrast-enhanced MRI and cardiac MDCT in the diagnosis of this interesting condition.

  20. Improvement in printing technique of spiral CT three-dimensional colour image

    International Nuclear Information System (INIS)

    Objective: To investigate the printing technique of spiral CT three-dimensional (3D) colour image. Methods: The 3D colour images of 136 patients were printed, with the equipment of Marconi spiral CT, personnel computer, colour ink printer, and network switchboard. Results: All printed images were satisfied by this method. Conclusion: This technique is economic, simple, and useful, and can meet the need for clinical diagnosis and operation. (authors)

  1. Diagnosing pulmonary embolism: establishing and consolidating the role of spiral CT

    OpenAIRE

    Strijen, Marco van

    2007-01-01

    In the Antelope study availability, use and diagnostic accuracy of spiral CT in patients clinically suspected of PE was investigated. This study was divided in two separate phases, starting with a prospective evaluation of available diagnostic techniques part of the diagnostic consensus strategy in The Netherlands in a specifically designed algorithm. Phase I showed that in a direct comparison with the gold standard sensitivity and specificity of spiral CT is too low to endorse its role as a ...

  2. The diagnostic value of 3D spiral CT imaging of cholangiopancreatic ducts on obstructive jaundice

    Institute of Scientific and Technical Information of China (English)

    Linquan Wu; Xiangbao Yin; Qingshan Wang; Bohua Wu; Xiao Li; Huaqun Fu

    2011-01-01

    Objective: Computerized tomography (CT) plays an important role in the diagnosis of diseases of biliary tract. Recently, three dimensions (3D) spiral CT imaging has been used in surgical diseases gradually. This study was designed to evaluate the diagnostic value of 3D spiral CT imaging of cholangiopancreatic ducts on obstructive jaundice. Methods: Thirty patients with obstructive jaundice had received B-mode ultrasonography, CT, percutaneous transhepatic cholangiography (PTC) or endoscopic retrograde cholangiopancreatography (ERCP), and 3D spiral CT imaging of cholangiopancreatic ducts preoperatively. Then the diagnose accordance rate of these examinational methods were compared after operations. Results: The diagnose accordance rate of 3D spiral CT imaging of cholangiopancreatic ducts was higher than those of B-mode ultraso-nography, CT, or single PTC or ERCP, which showed clear images of bile duct tree and pathological changes. As to malignant obstructive jaundice, this examinational technique could clearly display the adjacent relationship between tumor and liver tissue, biliary ducts, blood vessels, and intrahepatic metastases. Conclusion: 3D spiral CT imaging of cholangiopancreatic ducts has significant value for obstructive diseases of biliary ducts, which provides effective evidence for the feasibility of tumor-resection and surgical options.

  3. The value of spiral CT scan on fracture of ankle joint and tarsal bones

    International Nuclear Information System (INIS)

    Objective: To study the value of spiral CT scan on the fracture of ankle joint and tarsal bones. Methods: 43 cases with the fracture of ankle joint and tarsal bones were collected and analyzed. All the cases were examined by plain film radiography and spiral CT thin slice scan. Multi-planar reformation (MPR), surface shaded display (SSD) and other techniques of image post-processing were performed in 35 cases of them. Results: Spiral CT scan could demonstrate more fractures than plain film radiography in 28 cases(65.1%). There are 15 cases (34.9%) which are normal in plain film radiography but abnormal in Spiral CT scan. Spiral CT could demonstrate the different length, width, direction and number of linear low density shadow. SSD and MPR were performed again in the cases with avulsion fracture and fragmental fracture to demonstrate the fracture direction and the shape, size and location of fragments more clearly. Conclusion: Spiral CT thin slice scan with image post-processing techniques can play an important role in fracture of ankle joint and tarsal bones. (authors)

  4. Measurement of total lung capacity : a comparison of spiral CT and spirometry

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Kyung Il; Park, Kyung Ju; Lee, Eh Hyung; Yune, Heun Young; Suh, Jung Ho [Ajou Univ. School of Medicine, Suwon (Korea, Republic of); Choe, Kyu Ok; Lim, Tae Hwan [Yonsei Univ. College of Medicine, Seoul (Korea, Republic of); Chung, In Hyuk [Ulsan Univ. College of Medicine, Seoul (Korea, Republic of)

    1996-08-01

    To determine the potential of spiral CT as a functional imaging modality of the lung aside from its proven value in morphological depiction. Spiral CT scan was performed in ten normal female and nine normal male adults (mean age: 39, height: 163 cm, weight: 62 kg ) after single full breath-holding. Three dimensional lung images were reconstructed(minimal threshold value: -1,000HU, maximal threshold values: -150, 250, -350, -450 HU) to obtain total lung volume(TLV) on a histogram. Total lung volume measured by spiral CT was compared with TLV obtained by spirometry. Mean TLV measured by spirometry was 5.62L and TLV measured by CT at maximal threshold values of -150, -250, -350, and -450 HU was 5.53, 5.33, 5.15, and 4.98L, respectively. Mean absolute differences between the modalities of 0.17L(3%), 0.32L(5.6%), 0.48L(8.5%), 0.65L(11.5%) were statistically significant(p<0.001). Linear regression coefficients between the modalities were 0.99, 0.97, 095, and 0.94 and no statistically significant differences in accuracy of threshold levels in the estimation of lung volume(r=0.99, standard error=0.034L in all) were seen. TLV measured by spiral CT closely approximated that measured by spirometry. Spiral CT may be useful as a means of evaluating lung function.

  5. Measurement of total lung capacity : a comparison of spiral CT and spirometry

    International Nuclear Information System (INIS)

    To determine the potential of spiral CT as a functional imaging modality of the lung aside from its proven value in morphological depiction. Spiral CT scan was performed in ten normal female and nine normal male adults (mean age: 39, height: 163 cm, weight: 62 kg ) after single full breath-holding. Three dimensional lung images were reconstructed(minimal threshold value: -1,000HU, maximal threshold values: -150, 250, -350, -450 HU) to obtain total lung volume(TLV) on a histogram. Total lung volume measured by spiral CT was compared with TLV obtained by spirometry. Mean TLV measured by spirometry was 5.62L and TLV measured by CT at maximal threshold values of -150, -250, -350, and -450 HU was 5.53, 5.33, 5.15, and 4.98L, respectively. Mean absolute differences between the modalities of 0.17L(3%), 0.32L(5.6%), 0.48L(8.5%), 0.65L(11.5%) were statistically significant(p<0.001). Linear regression coefficients between the modalities were 0.99, 0.97, 095, and 0.94 and no statistically significant differences in accuracy of threshold levels in the estimation of lung volume(r=0.99, standard error=0.034L in all) were seen. TLV measured by spiral CT closely approximated that measured by spirometry. Spiral CT may be useful as a means of evaluating lung function

  6. Coronary calcium mass scores measured by identical 64-slice MDCT scanners are comparable : a cardiac phantom study

    NARCIS (Netherlands)

    Dijkstra, Hildebrand; Greuter, Marcel J. W.; Groen, Jaap M.; Vliegenthart-Proenca, Rozemarijn; Renema, KlaasJan W. K.; de Lange, Frank; Oudkerk, Matthijs

    2010-01-01

    To assess whether absolute mass scores are comparable or differ between identical 64-slice MDCT scanners of the same manufacturer and to compare absolute mass scores to the physical mass and between scan modes using a calcified phantom. A non-moving anthropomorphic phantom with nine calcifications o

  7. Diagnostic Value of 16 Slices Spiral-CT for Portal Vein Disorders

    Institute of Scientific and Technical Information of China (English)

    李震; 胡道予; 肖明

    2004-01-01

    Summary: The diagnostic value of 16-slices spiral computed tomography (CT) for portal vein disorders was evaluated. Forty-one patients were scanned by the 16-slices spiral-CT. The celiac trunk,portal vein and their branches were reconstructed by volume rendering (VR), multiplanar volume reconstruction (MPVR) and maximum intensity projection (MIP) technique, and the results were compared with digital subtraction angiography (DSA). VR, MPVR and MIP could display celiac trunk, portal vein, inferior vena cava and their branches and extent of portal vein-vena cava shunt,portal vein emboli and the fistula of hepatic artery-portal vein. The results from 16-slices CT were better than DSA and identical with pathologic ones. The vessel three-dimension reconstruction technique of 16-slices spiral CT is valuable for evaluating the portal systemic disorders.

  8. Digital medical technology based on 64-slice computed tomography in hepatic surgery

    Institute of Scientific and Technical Information of China (English)

    FANG Chi-hua; HUANG Yan-peng; CHEN Mian-ling; LU Chao-min; LI Xiao-feng; QIU Wen-feng

    2010-01-01

    Background With the rapid development of computer technology, digital medicine has become a new direction in surgery. The application of digital medicine in hepatic surgery is still at the early stage and less reported in the literature. The aim of this study was to apply digital medical technology in the context of hepatic surgery. Methods Data from 64-slice helical computed tomography of 17 patients, including 13 with hepatocellular carcinoma and 4 with hepatic hemangioma, were imported into independently developed medical image software program, segmentation and three-dimensional reconstruction were performed. The three-dimensional models were then processed with the FreeForm Modeling System. We used virtual surgical instruments to perform surgery on the models. Simulated surgeries included six hepatic segmentectomies, four left hemihepatectomies, three right hemihepatectomies for hepatocellular carcinoma, one hepatic segmentectomy, two stripping surgeries, and one irregular segmentectomy combined with stripping surgery for hemangioma. For resections involving more than three hepatic segments, total and residual functional hepatic volumes were measured before and after simulation surgery, and the resection ratio was calculated.Results The anatomy of the models was distinct and was used to localize lesions. We used virtual surgical instruments to perform simulated surgeries and used the models to optimize actual surgeries. We were able to minimize resection volume as well as surgical risk.Conclusions Digital medical technology is helpful in the diagnosis of hepatic disease and in optimizing surgical plans. Three-dimensional models can decrease surgical risk and help prevent postoperative hepatic failure.

  9. Usefulness of 64-slice MDCT for follow-up of young children with coronary artery aneurysm due to Kawasaki disease: Initial experience

    International Nuclear Information System (INIS)

    To evaluate the initial application and value of 64-slice multidetector computed tomography as an alternative diagnostic modality in the follow-up of young children with coronary artery aneurysm due to Kawasaki disease. Twelve boys (mean age 5.1 years, range 1.8-7.8 years) for follow-up (time range from 1.1 to 5.1 years) of known Kawasaki disease and coronary artery aneurysm underwent 64-slice MDCT ECG-gated coronary angiography. All data were acquired without breath holding. Two pediatric radiologists independently assessed image quality and the diameter of all coronary segments were measured for each patient. The number, position, shape and size of each coronary artery aneurysm were observed and compared with those of ECHO performed previously. A total of 118/156 segments permitted visualization with diagnostic image quality, the CT measurements showed good inter-observer and intra-observer reliability, coefficients were 0.93 and 0.88, respectively. A total of 30 coronary artery aneurysms were identified with measured mean of 7.5 ± 3.8 mm in diameter, and of 12.4 ± 9.1 mm in longitudinal lengths.10 tumors were small, 8 tumors were medium and 12 tumors were giant aneurysm. The affected segments included LM7/12(58.3%), 9/12(75%) of LAD1, 4/12(33.3%) of LAD2, 2/12(16.7%) of LCX1; 6/12(50%) of RCA1, 9/12(75%) of RCA2 and 4/12(33.3%) of RCA3, including affected two segments in 9 tumors and three segments in 1 tumor. Calcifications were found in 5 aneurysms and 3/5 with thrombosis; six stenotic segments were found. ECHO failed to detect 8 tumors with 2/8 in LAD, 1/8 in LCX and 5/8 in RCA, and those included 4 small aneurysms. The use of 64-slice MDCT angiography proved valuable for monitoring young children with Kawasaki disease. However, further study is necessary to specify the sensitivity and specificity of MDCT in the follow-up.

  10. Renal colic: comparison of spiral CT, US and IVU in the detection of ureteral calculi

    Energy Technology Data Exchange (ETDEWEB)

    Yilmaz, S.; Sindel, T.; Arslan, G.; Oezkaynak, C.; Karaali, K.; Kabaalioglu, A.; Lueleci, E. [Department of Radiology, Akdeniz University Medical Faculty, Arapsuyu, Antalya (Turkey)

    1998-03-01

    The aim of our study was to compare noncontrast spiral CT, US and intravenous urography (IVU) in the evaluation of patients with renal colic for the diagnosis of ureteral calculi. During a period of 17 months, 112 patients with renal colic were examined with spiral CT, US and IVU. Fifteen patients were lost to follow-up and excluded. The remaining 97 patients were defined to be either true positive or negative for ureterolithiasis based on the follow-up data. Sensitivity, specificity, positive and negative predictive value and accuracy of spiral CT, US and IVU were determined, and secondary signs of ureteral stones and other pathologies causing renal colic detected with these modalities were noted. Of 97 patients, 64 were confirmed to have ureteral calculi based on stone recovery or urological interventions. Thirty-three patients were proved not to have ureteral calculi based on failure to recover a stone and diagnoses unrelated to ureterolithiasis. Spiral CT was found to be the best modality for depicting ureteral stones with a sensitivity of 94 % and a specificity of 97 %. For US and IVU, these figures were 19, 97, 52, and 94 %, respectively. Spiral CT is superior to US and IVU in the demonstration of ureteral calculi in patients with renal colic, but because of its high cost, higher radiation dose and high workload, it should be reserved for cases where US and IVU do not show the cause of symptoms. (orig.) With 4 figs., 3 tabs., 12 refs.

  11. A new approach to the assessment of lumen visibility of coronary artery stent at various heart rates using 64-slice MDCT

    Energy Technology Data Exchange (ETDEWEB)

    Groen, J.M.; Greuter, M.J.W.; Ooijen, P.M.A. van; Oudkerk, M. [University Medical Center Groningen, University of Groningen, Department of Radiology, Hanzeplein 1, P.O. Box 30001, Groningen (Netherlands)

    2007-07-15

    Coronary artery stent lumen visibility was assessed as a function of cardiac movement and temporal resolution with an automated objective method using an anthropomorphic moving heart phantom. Nine different coronary stents filled with contrast fluid and surrounded by fat were scanned using 64-slice multi-detector computed tomography (MDCT) at 50-100 beats/min with the moving heart phantom. Image quality was assessed by measuring in-stent CT attenuation and by a dedicated tool in the longitudinal and axial plane. Images were scored by CT attenuation and lumen visibility and compared with theoretical scoring to analyse the effect of multi-segment reconstruction (MSR). An average increase in CT attenuation of 144 {+-} 59 HU and average diminished lumen visibility of 29 {+-} 12% was observed at higher heart rates in both planes. A negative correlation between image quality and heart rate was non-significant for the majority of measurements (P > 0.06). No improvement of image quality was observed in using MSR. In conclusion, in-stent CT attenuation increases and lumen visibility decreases at increasing heart rate. Results obtained with the automated tool show similar behaviour compared with attenuation measurements. Cardiac movement during data acquisition causes approximately twice as much blurring compared with the influence of temporal resolution on image quality. (orig.)

  12. Diagnosis of pulmonary embolism with spiral CT as a second procedure following scintigraphy

    Energy Technology Data Exchange (ETDEWEB)

    Strijen, Marco J.L. van; Kieft, Gerard J. [Department of Radiology, Leyenburg Ziekenhuis, Leyweg 275, 2545 CH The Hague (Netherlands); Monye, Wouter de; Bloem, Johan L. [Department of Radiology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden (Netherlands); Pattynama, Peter M.T. [Department of Radiology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden (Netherlands); Department of Radiology, Erasmus University Medical Center Rotterdam, Dr. Molewaterplein 40, 3015 GD Rotterdam (Netherlands); Huisman, Menno V. [Leiden University Medical Center, Dept. of General Internal Medicine, P.O. Box 9600, 2300 RC Leiden (Netherlands); Smith, Sierd J. [Department of Internal Medicine, Leyenburg Hospital, Leyweg 275, 2545 CH The Hague (Netherlands)

    2003-07-01

    Heading Abstract.Our objective was to evaluate, in a routine clinical setting, the role of spiral CT as a second procedure in patients with clinically suspected pulmonary embolism (PE) and abnormal perfusion scan. We prospectively studied the role of spiral CT in 279 patients suspected of PE. All patients started their diagnostic algorithm with chest radiographs and perfusion scintigraphy. Depending on the results of perfusion scintigraphy, patients proceeded to subsequent levels in the algorithm: stop if perfusion scintigraphy was normal; CT and pulmonary angiography if subsegmental perfusion defects were seen; ventilation scintigraphy followed by CT when segmental perfusion defects were seen; and pulmonary angiography in this last group when results of ventilation/perfusion scintigraphy and CT were incongruent. Reference diagnosis was based on normal perfusion scintigraphy, high probability perfusion/ventilation scintigraphy in combination with abnormal CT, or pulmonary angiography. If PE was present, the largest involved branch was noted on pulmonary angiography, or on spiral CT scan in case of a high-probability ventilation/perfusion scan and a positive CT scan. A distinction was made between embolism in a segmental branch or larger, or subsegmental embolism. Two hundred seventy-nine patients had abnormal scintigraphy. In 27 patients spiral CT and/or pulmonary angiography were non-diagnostic and these were excluded for image analysis. Using spiral CT we correctly identified 117 of 135 patients with PE, and 106 of 117 patients without PE. Sensitivity and specificity was therefore 87 and 91%, respectively. Prevalence of PE was 53%. Positive and negative predictive values were, respectively, 91 and 86%. In the high-probability group, sensitivity and specificity increased to 97 and 100%, respectively, with a prevalence of 90%. In the non-high probability-group sensitivity and specificity decreased to 61 and 89%, respectively, with a prevalence of 25%. In a routine

  13. Diagnosis of pulmonary embolism with spiral CT as a second procedure following scintigraphy

    International Nuclear Information System (INIS)

    Heading Abstract.Our objective was to evaluate, in a routine clinical setting, the role of spiral CT as a second procedure in patients with clinically suspected pulmonary embolism (PE) and abnormal perfusion scan. We prospectively studied the role of spiral CT in 279 patients suspected of PE. All patients started their diagnostic algorithm with chest radiographs and perfusion scintigraphy. Depending on the results of perfusion scintigraphy, patients proceeded to subsequent levels in the algorithm: stop if perfusion scintigraphy was normal; CT and pulmonary angiography if subsegmental perfusion defects were seen; ventilation scintigraphy followed by CT when segmental perfusion defects were seen; and pulmonary angiography in this last group when results of ventilation/perfusion scintigraphy and CT were incongruent. Reference diagnosis was based on normal perfusion scintigraphy, high probability perfusion/ventilation scintigraphy in combination with abnormal CT, or pulmonary angiography. If PE was present, the largest involved branch was noted on pulmonary angiography, or on spiral CT scan in case of a high-probability ventilation/perfusion scan and a positive CT scan. A distinction was made between embolism in a segmental branch or larger, or subsegmental embolism. Two hundred seventy-nine patients had abnormal scintigraphy. In 27 patients spiral CT and/or pulmonary angiography were non-diagnostic and these were excluded for image analysis. Using spiral CT we correctly identified 117 of 135 patients with PE, and 106 of 117 patients without PE. Sensitivity and specificity was therefore 87 and 91%, respectively. Prevalence of PE was 53%. Positive and negative predictive values were, respectively, 91 and 86%. In the high-probability group, sensitivity and specificity increased to 97 and 100%, respectively, with a prevalence of 90%. In the non-high probability-group sensitivity and specificity decreased to 61 and 89%, respectively, with a prevalence of 25%. In a routine

  14. Spiral CT arthrography of the knee: technique and value in the assessment of internal derangement of the knee

    International Nuclear Information System (INIS)

    Computed tomography imaging has achieved excellent multiplanar capability and submillimeter spatial resolution due to the development of the spiral acquisition mode and multidetector row technology. Multidetector spiral CT arthrography (CTA) yields valuable information for the assessment of internal derangement of the joints. This article focuses on the value of spiral CTA of the knee in the assessment of the meniscus, anterior cruciate ligament, and hyaline cartilage lesions. Advantages and disadvantages of spiral CTA with respect to MR imaging are presented. (orig.)

  15. Spiral CT arthrography of the knee: technique and value in the assessment of internal derangement of the knee

    Energy Technology Data Exchange (ETDEWEB)

    Berg, Vande B.C.; Lecouvet, F.E.; Maldague, B.; Malghem, J. [Department of Radiology, Cliniques Universitaires St. Luc, Universite Catholique de Louvain, Brussels (Belgium); Poilvache, P. [Department of Orthopedic Surgery, Cliniques Universitaires St. Luc, Universite Catholique de Louvain, Brussels (Belgium)

    2002-07-01

    Computed tomography imaging has achieved excellent multiplanar capability and submillimeter spatial resolution due to the development of the spiral acquisition mode and multidetector row technology. Multidetector spiral CT arthrography (CTA) yields valuable information for the assessment of internal derangement of the joints. This article focuses on the value of spiral CTA of the knee in the assessment of the meniscus, anterior cruciate ligament, and hyaline cartilage lesions. Advantages and disadvantages of spiral CTA with respect to MR imaging are presented. (orig.)

  16. Coronary artery dissection with rupture of aortic valve commissure following type A aortic dissection: the role of 64-slice MDCT.

    Science.gov (United States)

    Das, K M; Abdou, Sayed M; El-Menyar, Ayman; Ayman, El Menyar; Khulaifi, A A; Nabti, A L

    2008-01-01

    A rare case of bilateral coronary artery dissection with rupture of aortic valve commissure following type A aortic dissection is described. 64-slice multidetector computed tomography (MDCT) was able to demonstrate both this findings along with involvement of other neck vessels. TEE demonstrated the severity and mechanisms of aortic valve damage and assisted the surgeon in valve repair. MDCT has played an invaluable role in the diagnosis of the abnormal details of such life-threatening vascular complications. PMID:18384568

  17. Diagnostic Value of 64-slice CTA in Detection of Intracranial Aneurysm in Patients with SAH and Comparison of the CTA Results with 2D-DSA and Intraoperative Findings

    Directory of Open Access Journals (Sweden)

    Elif Ergun

    2011-03-01

    Full Text Available Objective: To prospectively evaluate the diagnostic value of 64-slice CTA in detecting intracranial aneurysms and to compare it with 2D-DSA and/or intra-operative findings.Material and Methods: 37 cases with SAH according to unenhanced cranial CT were included in the study. A 64-slice CTA was performed to all cases immediately after the nonenhanced cranial CT. DSA was performed in 24-48 hours following CTA. CT images were reviewed by two radiologists experienced in CT vascular imaging. The DSA reader was the angiographer who performed the DSA. The results of the CTA were compared with the DSA results and/or intraoperative findings in order to determine the diagnostic efficacy of CTA in detecting intracranial aneurysms. Results: Sensitivity, specificity, positive predictive value, negative predictive value and accuracy of CTA in detecting aneurysms were 92.8%, 83.3%, 96.2%, 71.4% and 91.2% respectively. The diagnostic value of CTA in detecting intracranial aneurysms was found to be equal to DSA by Mcnemar test. Conclusion: CTA is invaluable in detecting intracranial aneurysms. It may be used as a first line modality in SAH, and DSA may be reserved for patients with negative or equivocal CTA results.

  18. Evaluation of radiation exposure with singleslice- and a multislice-spiral CT system (a phantom study); Untersuchungen zur Strahlenexposition bei der Einzelschicht- und Mehrschicht-Spiral-CT (eine Phantom-Studie)

    Energy Technology Data Exchange (ETDEWEB)

    Giacomuzzi, S.M.; Rieger, M.; Lottersberger, C.; Peer, S.; Peer, R.; Buchberger, W.; Bale, R.; Mallouhi, A.; Jaschke, W. [Universitaetsklinik fuer Radiodiagnostik, Innsbruck (Austria); Torbica, P. [Inst. fuer Medizinische Physik, Innsbruck (Austria); Perkmann, R. [Universitaetsklinik fuer Gefaesschirurgie, Innsbruck (Austria)

    2001-07-01

    The purpose of study was to compare patient dose applying singleslice- and multislice-spiral CT. Methods: The examinations were performed with a singleslice-spiral CT (Highspeed Advantage; GE Medical Systems; Milwaukee, USA) and with a multislice CT systems (LightSpeed QX/i GE Medical Systems; Milwaukee, USA). For the determination of the radiation exposure (absorbed dose) a selection of most executed protocols (thorax-helical, abdomen-helical, petrous bone-axial, head-axial) were simulated using an Alderson Rando Phantom. The dose was determined by means of lithiumfluorid-thermoluminescence dosimeters (TLD-GR 200). Results: For thorax and abdomen protocols higher energy dose values could be found using a multislice CT. On the average the energy dose values were increased by 2.6 on an average in relation to single slice spiral CT. The energy dose values of the multisclice CT using head protocols could be reduced by 30% in relation to single slice spiral CT due to suitable parameter selections. The energy dose applying a petrous bone protocol resulted in an average increase by a factor 1.5 using a multislice CT. Conclusion: Using the new multislice CT technique protocol strategies must be optimized regarding the patient doses. Users can operate critically in the sense of the radiation protection only if they are aware of the occurring dose amounts to the patient. (orig.) [German] Es soll im Vergleich die Dosisbelastung bei der Einzelschicht Spiral-CT zur Mehrschicht-Spiral-CT dargestellt werden. Methoden: Die Untersuchungen wurden mit einem Einzelschicht Spiral-CT (ES Spiral-CT) (Highspeed Advantage; Fa. GE Medical Systems; Milwaukee, USA) und einem Mehrschicht-Spiral-CT (MS Spiral-CT) (LightSpeed Qx/l; Fa. GE Medical Systems; Milwaukee, USA) durchgefuehrt. Fuer die Bestimmung der Strahlenexposition (Energiedosis) wurde eine Auswahl der routinemaessig am meisten durchgefuehrten Untersuchungen (Thorax-helical, Abdomen-helical, Felsenbein-axial, Schaedel-axial) an

  19. Epidurography: Comparison with CT-, helical-CT- and MR-Epidurography; Die Epidurographie: Vergleich mit CT-, Spiral-CT- und MR-Epidurographie

    Energy Technology Data Exchange (ETDEWEB)

    Tomczak, R. [Univ. Ulm, Klinik fuer Radiologie (Germany); Seeling, W. [Univ. Ulm, Klinik fuer Anaesthesiologie (Germany); Rieber, A. [Univ. Ulm, Klinik fuer Radiologie (Germany); Sokiranski, R. [Univ. Ulm, Klinik fuer Radiologie (Germany); Rilinger, N. [Univ. Ulm, Klinik fuer Radiologie (Germany); Brambs, H.J. [Univ. Ulm, Klinik fuer Radiologie (Germany)

    1996-08-01

    liegenden Epiduralkathetern (EK) und drei Probanden nach Anlage eines EK wurden nach Injektion von Gadolinium-DTPA einer MR-Epidurographie, die drei Probanden zusaetzlich einem Doppel-Helix-Spiral-CT nach Injektion von jodhaltigem Kontrastmittel unterzogen. Ergebnisse: 40% der Patienten zeigten ein Schienenstrangphaenomen bedingt durch eine unterschiedlich starke Fuellung des Epiduralraumes mit Kontrastmittel im Bereich der Wirbelboegen und des Zwischenwirbelbogenbereiches, 76% der Patienten zeigten keinen ventralen thorakalen Epiduralraum, 56% eine Aufhellungslinie im a.-p. Bild der Epidurographie, die als Plica mediana dorsalis im CT identifiziert wurde. Die vorbeschriebenen Phaenomene wurden auch bei allen in der Spiral-CT- und MR-Epidurographie untersuchten Personen nachgewiesen. Schlussfolgerung: Die CT-Epidurographie ist geeignet zur Erklaerung von Bildmustern der Epidurographie. (orig.)

  20. Multi-slice spiral CT of living-related liver transplantation in children: pictorial essay

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Seong Hoon; Goo, Hyun Woo; Yoon, Chong Hyun [University of Ulsan College of Medicine, Asan Medical Center, Ulsan (Korea, Republic of)

    2004-09-15

    In pediatric living-related liver transplantation, preoperative evaluation of the recipient is important for surgical planning, while the accurate diagnosis of postoperative complications is essential for graft salvage. Multiplanar and three dimensional imaging using multi-slice spiral CT can be used for preoperative vascular imaging, as well as for evaluating postoperative complications. In this essay, we describe the usefulness of multi-slice CT, combined with a variety of different reconstruction techniques, for the preoperative evaluation of transplant recipients. In addition, we demonstrate the multi-slice CT findings of postoperative complications, including vascular stenosis or thrombosis, bile duct leak or stricture, and extrahepatic fluid collection.

  1. Multi-slice spiral CT of living-related liver transplantation in children: pictorial essay

    International Nuclear Information System (INIS)

    In pediatric living-related liver transplantation, preoperative evaluation of the recipient is important for surgical planning, while the accurate diagnosis of postoperative complications is essential for graft salvage. Multiplanar and three dimensional imaging using multi-slice spiral CT can be used for preoperative vascular imaging, as well as for evaluating postoperative complications. In this essay, we describe the usefulness of multi-slice CT, combined with a variety of different reconstruction techniques, for the preoperative evaluation of transplant recipients. In addition, we demonstrate the multi-slice CT findings of postoperative complications, including vascular stenosis or thrombosis, bile duct leak or stricture, and extrahepatic fluid collection

  2. Optimisation of contrast medium volume and injection-related factors in CT pulmonary angiography: 64-slice CT study

    Energy Technology Data Exchange (ETDEWEB)

    Uysal Ramadan, Selma [Ankara Training and Research Hospital, Department of Radiology, Ankara (Turkey); Ankara Training and Research Hospital, Cebeci, Ankara (Turkey); Kosar, Pinar; Sonmez, Iclal; Kosar, Ugur [Ankara Training and Research Hospital, Department of Radiology, Ankara (Turkey); Karahan, Sevilay [Hacettepe University, Department of Biostatistics, Faculty of Medicine, Ankara (Turkey)

    2010-09-15

    To compare the image quality of computed tomography pulmonary angiography (CTPA) obtained with the injection of various low doses of contrast medium (CM) with different injection-related factors. A total of 90 patients (42 females, 48 males; 54.3 {+-} 18.6 years) undergoing CTPA were included. Three CM protocols, each containing 30 patients, were created. Protocols 1, 2 and 3 consisted of a CM of 60 ml, 55 ml and 50 ml, and a bolus trigger level of 120 HU, 90 HU and 75 HU, respectively. Injection was uniphasic for protocols 1 and 2 (flow rate 5 ml/s), and biphasic for protocol 3 (flow rates 5 and 4 ml/s); with saline flushing afterwards. Enhancement was measured in three central and six peripheral pulmonary arteries. The mean attenuation value for pulmonary arteries was over 250 HU for all protocols. There was no difference between the attenuation levels with the protocols (p > 0.05). The percentage of pulmonary arteries exceeding optimal attenuation ({>=}250 HU) showed that protocols 2 and 3 were 90-100% successful (p < 0.05). The use of proper injection-related factors during CTPA, such as a low trigger level and a high flow rate with saline injection following a decreased CM volume (55 ml or 50 ml), will enable adequate pulmonary artery contrast enhancement. (orig.)

  3. Spiral CT during pharmacoangiography with angiotensin II in patients with pancreatic disease. Technique and diagnostic efficacy

    Energy Technology Data Exchange (ETDEWEB)

    Kuroda, C.; Mihara, N.; Hosomi, N.; Inoue, E.; Fujita, M. [Osaka Medical Center for Cancer and Cardiovascular Diseases (Japan). Dept. of Diagnostic Radiology; Ohigashi, H.; Ishikawa, O. [Osaka Medical Center for Cancer and Cardiovascular Diseases (Japan). Dept. of Surgery; Nakaizumi, A. [Osaka Medical Center for Cancer and Cardiovascular Deseases (Japan). Dept. of Internal Medicine; Ishiguro, S. [Osaka Medical Center for Cancer and Cardiovascular Diseases (Japan). Dept. of Pathology

    1998-03-01

    Purpose: To compare the diagnostic efficacy of pancreatic pharmacoangiographic CT using angiotensin II with conventional angiographic CT. Material and Methods: Eighteen patients with space-occupying pancreatic disease were examined in this study. Pharmacoangiographic CT was performed with a 1-3-{mu}/6-ml solution of angiotensin II injected through a catheter into the celiac artery during spiral CT. Results: In 17 of the 18 (94%) patients, the area of pancreatic parenchymal enhancement was the same or larger at pharmacoangiographic CT than at conventional angiographic CT. The attenuation value of the pancreatic parenchyma was significantly increased at pharmacoangiographic CT (p=0.0010). Although the attenuation value of tumors was also increased on images obtained after the injection of angiotensin II, the tumor-to-pancreas contrast was significantly greater at pharmacoangiographic CT (p=0.0479). The mean differences in attenuation between tumor and pancreas at angiographic CT with and without angiotensin II were respectively 182 HU and 115 HU. Conclusion: Pharmacoangiographic CT with angiotensin II proved superior to conventional angiographic CT in the diagnosis of pancreatic disease. We therefore recommend it as a supplementary technique at the angiographic examination of patients with suspected pancreatic tumor. (orig.).

  4. Stellenwert des Nativ-Spiral-CT in der Diagnostik von Ureterkonkrementen

    Directory of Open Access Journals (Sweden)

    Rau O

    2006-01-01

    Full Text Available Die differentialdiagnostische Vorgehensweise bei Pat. mit einer Urolithiasis, insbesondere bei Pat. mit nicht schattengebenden Konkrementen im konventionellen Röntgen, ist oftmals schwierig. Wir evaluierten den Einsatz des Nativ-Spiral-CT in dieser Patientengruppe. Die Sensitivität und Spezifität variiert in der Literatur zwischen 80 und 100 %. Zwischen 4/99 und 11/04 führten wir bei 103 Patienten (Pat. mit kolikartigen Flankenschmerzen, aber ohne Steinnachweis im konventionellen Röntgen, ein natives Spiral-CT durch. Zusätzlich verglichen wir mit dem korrespondierenden Ultraschall und der dazugehörigen Urinanalyse. Endpunkte unserer Untersuchung waren einerseits (A der makroskopische Steinnachweis, entweder als spontan abgegangenes Konkrement oder nach interventioneller Bergung des Konkrementes, bzw. (B kein Nachweis eines Konkrementes. Ein Steinnachweis ließ sich bei 55/103 Pat. führen. Bei 41/55 ließ sich mittels Spiral-CT das Konkrement bestätigen. Dies entspricht einer Spezifität von 75 %. 49 der 55 Pat. hatten zusätzlich eine Erythrozyturie und ebenfalls 49/55 zeigten im Ultraschall eine Dilatation des Nierenbeckenkelchsystems. Bei 48 Pat. von 103 wurden keine Konkremente gesichert. Bei 39 Pat. ließ sich in dieser Gruppe im Spiral-CT ebenfalls kein Konkrementnachweis führen, was einer Sensitivität von 82 % entspricht. Falsch positive Ergebnisse bei 9 Pat. ließen sich retrospektiv in der Auswertung der Spiral-CT’s auf Kalzifizierung benachbarter Strukturen zurückführen. Bei 34/48 wurde eine Erythrozyturie und bei 32/48 eine Dilatation des oberen Harntraktes diagnostiziert. Retrospektiv wurden diese Symptome auf eine infektiöse Mitbeteiligung des Retroperitonealraumes zurückgeführt. Zusätzlich ließ sich eine Raumforderung der Leber, eine Raumforderung im Bereich des proximalen Femur und drei Kolontumore sichern. Unsere Serie von Spiral-CT’s bei Pat. ohne Konkrementnachweis im konventionellen Röntgen zeigte eine

  5. Radiation dose reduction by using 100-kV tube voltage in cardiac 64-slice computed tomography: A comparative study

    International Nuclear Information System (INIS)

    Objective: To evaluate a 100-kilovoltage (kV) tube voltage protocol regarding radiation dose and image quality, in comparison with the standard 120 kV setting in cardiac computed tomography angiography (CCTA). Methods: 103 patients undergoing retrospective ECG-gated helical 64-slice CCTA were enrolled (100 kV group: 51 patients; 120 kV group: 52 patients). Inclusion criteria were: (1) BMI 2; (2) weight 25 kg/m2). Conclusions: The 100 kV protocol significantly reduces the radiation dose in CCTA in patients with a low BMI 2 and a low calcium load while maintaining high image quality and the advantages of helical scan algorithm.

  6. Analysis of shielding calculation methods for 16- and 64-slice computed tomography facilities

    Energy Technology Data Exchange (ETDEWEB)

    Moreno, C; Cenizo, E; Bodineau, C; Mateo, B; Ortega, E M, E-mail: c_morenosaiz@yahoo.e [Servicio de RadiofIsica Hospitalaria, Hospital Regional Universitario Carlos Haya, Malaga (Spain)

    2010-09-15

    The new multislice computed tomography (CT) machines require some new methods of shielding calculation, which need to be analysed. NCRP Report No. 147 proposes three shielding calculation methods based on the following dosimetric parameters: weighted CT dose index for the peripheral axis (CTDI{sub w,per}), dose-length product (DLP) and isodose maps. A survey of these three methods has been carried out. For this analysis, we have used measured values of the dosimetric quantities involved and also those provided by the manufacturer, making a comparison between the results obtained. The barrier thicknesses when setting up two different multislice CT instruments, a Philips Brilliance 16 or a Philips Brilliance 64, in the same room, are also compared. Shielding calculation from isodose maps provides more reliable results than the other two methods, since it is the only method that takes the actual scattered radiation distribution into account. It is concluded therefore that the most suitable method for calculating the barrier thicknesses of the CT facility is the one based on isodose maps. This study also shows that for different multislice CT machines the barrier thicknesses do not necessarily become bigger as the number of slices increases, because of the great dependence on technique used in CT protocols for different anatomical regions.

  7. Virtual endoscopy using spiral CT in patients with carcinomas of the hypopharynx and larynx

    Energy Technology Data Exchange (ETDEWEB)

    Song, Sang Gook; Seo, Jeong Jin; Chung, Tae Woong; Kim, Hyeong Kil; Jeong, Gwang Woo; Jeong, Yong Yeon; Kang, Heoung Keun; Cho, Jae Sik [Medical School, Chonnam University, Kwangju (Korea, Republic of)

    2000-05-01

    To compare the usefulness of virtual endoscopy using spiral CT with that of laryngoscopy in the detection and evaluation of laryngeal and pharyngeal carcinomas. Twenty-four patients with pathologically proven laryngeal and pharyngeal carcinomas underwent laryngoscopy and virtual endoscopy using spiral CT. Eleven of the carcinomas were supraglottic, five were glottic, and eight were hypopharyngeal. Source images obtained by spiral CT were transmitted to an independent workstation and virtual endoscopic images were obtained using Navigator software. These were graded according to their quality (good, fair, bad), and were interpreted by two radiologists who were blinded to the conventional endoscopic findings. These latter were subsequently compared with the virtual endoscopic findings in terms of similarity to laryngoscopic examination and detectability of lesions. The overall image quality of virtual endoscopy was good in 16 cases (67%), fair in eight (33%), and bad in no case. Among the 11 supraglottic carcinomas, image quality was good in seven cases (64%), and fair in four (36%). In four of the five glottic carcinomas (80%) quality was good, and in one case (20%) it was fair, while among the eight hypopharyngeal carcinomas, quality was good in five cases (63%), and fair in three (37%). Overall, detection of the lesion was possible in 23 cases (96%). Due to the small size of the lesion, the one case of glottic carcinoma was not detected. Virtual endoscopy using spiral CT is a safe and noninvasive method, and also successfully detects laryngeal and pharyngeal lesions, with good image quality. For the evaluation of laryngeal and hypopharyngeal carcinoma, its use ma complement that of axial CT. (author)

  8. Efficacy of spiral CT in the evaluation of peritoneal seeding of gastric cancer

    International Nuclear Information System (INIS)

    To determine usefulness of spiral CT in the preoperative evaluation of peritoneal seeding from a gastric carcinoma. From a database of 411 consecutive patients with surgically proven advanced gastric cancinoma obtained over a six-month period, 17 with peritoneal seeding and a control group of 24 without peritoneal seeding underwent spiral CT scanning with 7-8 mm scan thickness and interval during the portal phase. Preoperative CT images were analyzed by two readers who reached a consensus with regard to the presence and location of the ascites, thickening of the parietal peritoneum, and changes in the omentum and mesentery. Ascites was present in 47% (8/17) of patients with peritoneal seeding the right subhepatic space (n=6, 35%) and right paracolic gutter (n=5, 29%)-but not the cul-de-sac (n=2, 12%)-were common sites of fluid collection. Permeative changes in the omentum and mesentery were seen in 18% (3/17) and 12% (2/17) of patients, respectively. Among five controls with false positive results, ascites in the cul-de-sac was present in three (two males and one female, 12%) while omental nodules and a thickened peritoneum were found in two (8%) and one (4%), respectively. In nine controls with false negative results, small disseminated nodules were seen in the mesentery and omentum at surgical field. The sensitivity and specificity of spiral CT were 47% (8/17) and 79% (19/24), respectively. In terms of sensitivity and specificity, spiral CT is not especially accurate in distinguishing peritoneal seeding from gastric carcinoma

  9. Cardiac spiral dual-source CT with high pitch: a feasibility study

    Energy Technology Data Exchange (ETDEWEB)

    Ertel, Dirk; Kalender, Willi A. [University of Erlangen-Nuernberg, Institute of Medical Physics (IMP), Erlangen (Germany); Lell, Michael M. [University of Erlangen-Nuernberg, Department of Radiology, Erlangen (Germany); Harig, Frank [University of Erlangen-Nuernberg, Center of Cardiac Surgery, Erlangen (Germany); Flohr, Thomas; Schmidt, Bernhard [Siemens Healthcare, Forchheim (Germany)

    2009-10-15

    Increase of pitch in spiral CT decreases data acquisition time; dual-source CT (DSCT) systems provide improved temporal resolution. We evaluated the combination of these two features. Measurements were performed using a commercial DSCT system equipped with prototype software allowing pitch factors from p=0.35 to 3.0. We measured slice sensitivity profiles as a function of pitch to assess spatial resolution in the z-direction and the contrast of structures moved periodically to measure temporal resolution. Additionally we derived modulation transfer functions to provide objective parameters; both spatial and temporal resolution were essentially unchanged even at high pitch. CT of the cardiac region of three pigs was performed at p=3.0. In vivo CT images confirmed good image quality; direct comparison with standard low-pitch phase-correlated CT image datasets showed no significant difference. For a normalized z-axis acquisition of 12 cm, the corresponding effective dose value was 2.0 mSv for the high-pitch CT protocol. We conclude that spiral DSCT imaging with a pitch of 3.0 can provide unimpaired image quality with respect to spatial and temporal resolution. Applications to cardiac and thoracic imaging with effective dose below 1 mSv are possible. (orig.)

  10. Evaluation of triphasic contrast enhanced spiral CT for diagnosing hepatocellular adenoma (report of 5 cases)

    International Nuclear Information System (INIS)

    Objective: To evaluate the diagnostic and differential value of triphasic, especially the arterial phase, contrast enhanced CT scans for the hepatocellular adenoma, and to improve CT diagnostic accuracy. Methods: Spiral CT scanning of pre- and post-contrast arterial phase, portal venous phase and delayed phase was performed in 5 patients with hepatocellular adenomas proved surgically and pathologically. The enhancement was administrated with venous injection of 3 ml/sec, totally 100 ml angiografin. Arterial phase of contrast-enhanced scanning started 20-30 sec, portal venous phase 60-70 sec and delay scanning 3 min after the injection of contrast medium. The degrees of the enhancement of adenoma and normal tissues of liver in the three contrast enhanced phases were calculated and compared statistically. Results: In plain CT, the lesions were iso-density in 4 cases and slight hypo density in 1 case, which was hardly distinguished from the normal tissue. In all 5 cases, the lesions showed marked enhancement in the arterial phase compared with normal tissue of liver (38 HU high), and there were markedly statistical difference (t = 18.94, P 0.05). The mean CT value of hepatocellular adenoma in the arterial phase was much higher than that in portal venous and delay phase, there were statistical differences between them (F = 18.39, P < 0.01). Conclusion: Triphasic contrast enhanced spiral CT scan, especially the arterial phase scan, is valuable in detecting and differentiating hepatocellular adenoma

  11. Spiral CT vesiculography: a new method for examining patients with histologically confirmed prostate carcinoma

    International Nuclear Information System (INIS)

    Purpose: Development of an imaging method for detection of seminal vesicle invasion in patients with histologically proven carcinoma of the prostate. Materials and methods: In 24 patients with histologically proven carcinoma of the prostate we preoperatively performed an antegrade vaso-vesiculography with non-ionic, iodine-containing contrast agent followed by a spiral CT of the seminal vesicles. Results: In 21 patients we achieved both a bilateral and a bulging enhancement of the seminal vesicle lumen. The method is introduced and described in detail. Conclusions: Intraductal application of contrast agent just before spiral CT results in unfold and bulging enhanced seminal vesicles. From the differentiation of the lumen, the wall, and the surrounding fat of the seminal vesicles as well as the enhanced ejaculatory ducts we expect information on tumourous infiltration in cases of histologically proven carcinomas of the prostate. (orig.)

  12. SPECT/spiral-CT hybrid imaging in unclear foci of increased bone metabolism: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Roemer, W.; Kuwert, T. [Nuklearmedizinische Klinik, Friedrich-Alexander-Univ. Erlangen/Nuernberg (Germany); Beckmann, M.W. [Frauenklinik, Friedrich-Alexander-Univ. Erlangen/Nuernberg (Germany); Forst, R. [Lehrstuhl fuer Orthopaedie mit Orthopaedischer Chirurgie, Friedrich-Alexander Univ. Erlangen/Nuernberg (Germany); Bautz, W. [Radiologisches Inst., Friedrich-Alexander-Univ. Erlangen/Nuernberg (Germany)

    2005-07-01

    In bone scintigraphy, the differentiation between degenerative processes and bone metastases is still difficult. Therefore, additional radiological studies are regularly needed after bone scintigraphy. The now introduced hybrid-cameras combining single-photon emission computed tomography (SPECT) and spiral-CT are unique in the sense that they offer the opportunity to correlate the functional information with morphology in one session. We herein present two patients in whom this technological setup allowed a definite diagnosis in scintigraphically unclear vertebral lesions. In a patient with breast cancer, hypermetabolic lesions were clearly correlated with osteolyses. In another patient with synovial carcinoma, spondylosis and spondylarthrosis caused focal tracer uptake in the lumbar spine. In addition to an improved diagnostic accuracy, SPECT/Spiral-CT will considerably abbreviate the diagnostic process. (orig.)

  13. 64层螺旋CTA显示胚胎型大脑后动脉伴发Willis环多血管段变异的价值%Fetal origin of the posterior cerebral artery: variation of multi-segments of the circle of Willis demonstrated with 64-slice spiral CT angiography

    Institute of Scientific and Technical Information of China (English)

    叶莹莹; 张伟国; 陈蓉; 陈金华; 李雪

    2007-01-01

    目的 探讨64层螺旋CT血管成像(CTA) 显示胚胎型大脑后动脉(FTP)伴发Willis环多血管段变异的价值.方法 对比分析201例64层螺旋CTA诊断为FTP及201例诊断为非FTP(对照组)的影像学资料,观察Willis环的形态学改变.结果 FTP组与对照组相比,FTP患者更易伴发大脑前动脉A1段、大脑后动脉P1段和椎动脉(VA)变异,且单侧FTP更易发生同侧A1段和P1段变细、发育不良或缺如(P0.05).结论 FTP患者常伴发Willis环多血管段变异,64层螺旋CTA能够全面地评价脑血管的解剖与变异,有助于指导脑血管病的诊断与治疗.

  14. The evaluation of image quality using optimized low-dose contrast injection protocols on 64-slice spiral CT in coronary artery angiography%64层螺旋CT冠状动脉成像中优化对比剂注射技术对图像质量的影响

    Institute of Scientific and Technical Information of China (English)

    王妍焱; 吴国庚; 谭晔; 焦晟; 巴凯; 武凤菊; 周诚

    2010-01-01

    目的:比较常规固定对比剂注射方案和依据患者体重选择对比剂用量和流率技术对64层螺旋CT冠状动脉成像质量的影响.方法:研究中分别采用两种不同的对比剂应用方案,方案1:固定对比剂用量(70ml Iopamidol 370),方案2:依据患者的体重选择对比剂用量(0.8ml/kg).100位行前瞻性心电门控冠状动脉检查的患者随机分为2组(50人/组),分别采用上述不同的对比剂方案.对横断面图像、多平面重组图像的图像质量进行评价(5分优,1分差),并选择冠状动脉不同节段处测量对比剂增强水平.统计分析两种方案下的图像质量、对比剂增强水平和对比剂用量.结果:方案1和方案2条件下的图像质量评分分别为4.17±0.23和4.24±0.18,无统计学差异(P>0.05).对比剂平均增强水平存在统计学差异,方案1增强水平为(446±75)HU,而方案2为(387±69)HU.对比剂用量同样存在统计学差异,分别为70ml和53 1ml.结论:与固定对比剂应用方案相比,在冠状动脉成像中依据患者体重选择对比剂用量技术可以获得令人满意的图像,能够显著降低对比剂的用量,同时有助于获得更佳并且更为一致性的对比剂增强水平.

  15. Clinical application of 64-slices spiral CT angiography in diagnosing subarachnoid hemorrhage and Nursing care%64层螺旋CT血管造影在蛛网膜下腔出血诊断的临床运用及护理

    Institute of Scientific and Technical Information of China (English)

    黎兴华

    2007-01-01

    目的:探讨64层螺旋CT血管造影(CTA)在蛛网膜下腔出血(SAH)病因诊断中的运用及护理.方法:对2005年9月~2006年9月收治入院的89例SAH患者行64层螺旋CT血管造影检查,其中49例同时接受数字减影血管造影(DSA)检查.分析CTA检查结果并与DSA检查结果比较.结果:89例患者中CTA检出动脉瘤70例,动静脉畸形9例,静脉窦血栓2例,阴性8例;在同时接受DSA检查的49例患者中,发现动脉瘤41例,动静脉畸形4例,阴性4例,其中除1例CTA发现并经临床证实的动脉瘤DSA检查为阴性外,其余全部CTA确诊.CTA对SAH病因诊断中的敏感性和特异性均为100%,DSA分别为98%和100%.结论:64层螺旋CTA对SAH的病因诊断是一种无创、快速、便捷的影像学检查方法,做好检查时的护理配合,可使血管的空间立体结构及周边关系显示良好,有助于治疗方法的选择和难度的评估.

  16. 64排螺旋CT与血清肿瘤标志物联合检测在肺癌诊断中的价值%THE VALUE OF 64-SLICE SPIRAL CT COMBINED WITH SERUM TUMOR MARKERS FOR THE DIAGNOSIS OF LUNG CANCER

    Institute of Scientific and Technical Information of China (English)

    杨晋

    2014-01-01

    目的 探讨64排螺旋CT与血清肿瘤标志物联合检测在肺癌诊断中的价值,旨在为肺癌的临床诊断提供参考.方法 选取55例肺癌患者(观察组)和50例肺部良性病变者(对照组),分别采用64排螺旋CT扫描、检测血清肿瘤标志物如癌胚抗原(CEA)、细胞角质素片段抗原21-1(CYFRA 21-1)及神经元特异性烯醇化酶(NSE)等指标,分析血清肿瘤标志物、CT单独检测以及联合检测的敏感性和特异性.结果 观察组CEA、CYFRA 21-1及NSE水平均高于对照组,且二组比较差异有统计学意义(P<0.05);血清肿瘤标志物与CT扫描联合诊断的特异性(92.2%)和敏感性(90.2%)均明显提高.结论 血清肿瘤标志物与CT扫描联合用于肺癌的诊断,可进一步提高肺癌诊断的准确性、特异性及敏感性,对于肺癌的临床诊断具有重要的应用价值.

  17. Thromboembolic Complications Following Spine Surgery Assessed with Spiral CT Scans: DVT/PE Following Spine Surgery

    OpenAIRE

    Kim, Han Jo; Walcott-Sapp, Sarah; Adler, Ronald S.; Pavlov, Helene; Boachie-Adjei, Oheneba; Westrich, Geoffrey H.

    2010-01-01

    Spine surgery is associated with a significant risk of postoperative pulmonary embolism (PE) and/or deep vein thrombosis (DVT). The goal of this study was to determine which symptoms and risk factors were associated with spiral CT scans positive for PE and/or DVT in the postoperative spine surgery patient. We conducted a retrospective review of all spine patients who underwent a postoperative CT to rule out PE during the period of March 2004–February 2006. The type of surgical procedure, risk...

  18. Pulmonary spheral tuberculosis: features and clinical significance of spiral dynamic CT

    International Nuclear Information System (INIS)

    Objective: To assess the features and clinical significance of spiral dynamic CT in patients with pulmonary spheral tuberculosis. Methods: The 54 foci in 42 patients with pulmonary spheral tuberculosis were studied. Thin-sections at 2 mm thickness and 2 mm interval through the nodular center were obtained before and after administration of contrast material. Results: In 54 pulmonary spheral tuberculosis, maximum enhanced CT value in 51 (94.4%, 51/54) foci was less than 20 HU, and more than 20 HU in the other 3(5.6%, 3/54) foci. 27(50.0%, 27/54) foci showed no any enhancement, 24, (44%, 24/54) foci showed capsular enhancement, 1(1.9%, 1/54) focus showed peripheral enhancement and 2(3.7%, 2/54) foci showed extensive enhancement. The accuracy of the correct diagnosis was 25.9% in terms of plain CT and 94.4% in terms of enhanced CT scanning. The difference was significant (x2 = 50.1, P < 0.05). The curative effect of extensive enhanced foci and peripheral enhanced foci was optimal, capsular enhanced foci was second, and non-enhanced foci was barely satisfactory. Conclusion: Spiral dynamic CT technique may improve the accuracy of diagnosing pulmonary spheral tuberculosis. No enhancement and/or capsular enhancement were suggestive of tuberculosis. The enhancing character of foci might contribute to assess the curative effect of anti-tuberculosis

  19. Power doppler ultrasound findings of renal infarct after experimental renal artery occlusion: comparison with spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Seung Eun; Shinn, Kyung Sub; Kim, Hak Hee; Mun, Seok Hwan; Lee, Young Joon; Lee, Bae Young; Choi, Byung Gil; Lee, Jae Mun; Lee, Hee Jeong [The Catholic University of Korea College of Medicine, Seoul (Korea, Republic of)

    1999-02-01

    To evaluate the efficacy of power Doppler ultrasonography (PDUS) in depicting renal infarction in rabbits during experimental renal segmental arterial occlusion, and to compare the results with those of CT scanning. In 28 rabbits weighing 2.5 4kg, the segmental renal artery was occluded through the left main renal artery by embolization with Ivalon (Nycomed, Paris, France). Power Doppler ultrasonography and spiral CT scanning were performed before and at 2, 5, 8, 15, and 24 hours, and 3 and 7 days after occlusion of the segmental renal artery. The location of infarcted areas and collaterals, as seen on PDUS and CT scans, was evaluated by two radiologists. In all cases, as seen on power Doppler ultrasonography, infarcted areas-when compared with normal parenchyma, clearly demonstrated wedge-shaped perfusion defects in the kidney. The location of the lesion closely corresponded to the location seen during CT scanning. After renal arterial occlusion, transiently congested capsular arteries, which were named 'capsular sign', were seen in 63% of rabbits in the two and five-hour groups. No significant cortical rim sign was demonstrated on power Doppler ultrasonography, though it was noted on spiral CT at 15 and 24 hours, and 3 and 7 days after renal arterial occlusion. Power Doppler ultrasonography was useful for the diagnosis of renal infarction. Congested capsular artery seen in the early stage of renal infarction might be a characteristic finding of this condition, as seen on power Doppler ultrasonography.

  20. Spiral CT of hepatocellular carcinoma: value of dynamic fast infusion of contrast material

    International Nuclear Information System (INIS)

    To assess the value of dynamic fast infusion of contrast material in the detection and diagnosis of hepatocellular carcinoma(HCC) with spiral CT. Two-phase dynamic spiral CT was performed in 59 patients with 104 HCCS. 150ml of nonionic contrast material was injected with an automatic injector at the rate of 5ml/sec. Two-phase images were obtained at 20-45 sec(arterial dominant phase) and 2-5 min(equilibrium phase) after the initiation of bolus injection of contrast material. The tumors were divided into three groups(5cm) according to the size and the enhancement patterns on two-phase images were compared. In the arterial phase, HCCs showed total or partial hyperattenuation in 79% of cases(82/104), isoattenuation in 12%, and hypoattenuation in 9%. In the equilibrium phase, HCCs showed hypoattenuation in 86%(89/104) and isoattenuation in 14%. The most common and characteristic enhancement patterns of HCCs were hyperattenuation in the arterial phase and hypoattenuataion in the equilibrium phase;in the latter, capsules were demonstrated in 45% of cases. Invasions of the portal and/or hepatic vein were demonstrated in 34% of cases. Dynamic fast infusion(5 ml/sec) of contrast material(150ml)is useful in the detection and diagnosis of HCCs with spiral CT

  1. 64层锥束CT扫描的优化系统%Optimization of System Design for 64-slice Cone Beam Computed Tomography

    Institute of Scientific and Technical Information of China (English)

    谢强; Eugene Williams; Charlie Shaughnessy; 唐向阳

    2005-01-01

    The technology for x-ray computed tomography (CT) has experienced tremendous growth in recent years. Since the introduction of 4-slice helical scanners in 1998, rapid improvement has been made on CT scanners in terms of the volume coverage, spatial resolution, scan speed, and the number of slices. These advancements not only significantly impact clinical applications, but also bring huge challenges to the CT system design. Because of the complexity of the volumetric CT (VCT) system, various strategies have to be utilized in the design process. These methodologies include theoretical analysis, computer simulation for system performance prediction, bench-top experiments for analysis confirmation, automated image analysis tools for automatically evaluating image performance, and double-blind tests with human observers for parameter optimization. In this paper, we present some of the system design considerations and optimization processes for a 64-slice scanner. These design processes ensure the optimal performance of the cone beam CT scanner. Initial clinical feedback has demonstrated the effectiveness of our approach.%近年来X射线断层成像(CT)技术获得了突飞猛进的发展,自1998年推出4层螺旋CT后,CT扫描设备在容积覆盖,空间分辨率,扫描速度,切片数方面取得了长足进展.这不仅给医学应用带来了深远的影响,同时也给CT系统设计提出了巨大的挑战.容积CT(VCT)的设计过程引入了各种策略来战胜其复杂性.这些方法学包括:理论分析,系统性能预测的图像分析工具,各种基于专家背对背评价的参数优化.本文论述了64层CT系统设计中的一些考虑因素及优化过程.这些设计过程保证了锥束CT的优化性能.首批客户的应用反馈显示了我们设计实践的有效率性.

  2. Stenoser i koronararterierne påvist med 64-slice-computertomografi

    DEFF Research Database (Denmark)

    Rasmussen, Klaus; Tilsted, Hans Henrik; Aarøe, Jens;

    2010-01-01

    Sv) was measured with both methods. RESULTS: In 17 patients (8.8%), the CT-angiogram was not assessable. In 177 patients (91.2%) with assessable CT-angiogram, the sensitivity of CTCA was 97%, the specificity 63%, the predictive value of a positive test 58%, and the predictive value of a negative test 97...... suggesting angina who had been referred for CA according to usual criteria. We excluded patients with known ischaemic heart disease and patients with an unstable heart rhythm. CTCA was analysed without knowledge of CA and vice versa. Stenoses > 50% were considered significant. The effective radiation (m......%. In the 174 patients in whom CTCA was performed using retrospective technique, the effective radiation was 14.0 ± 2.3, versus 4.9 ± 2.6 at CA (p radiation was 5.4 ± 1.2 versus 5.9 ± 3.6 at CA (non...

  3. Acute stent thrombosis after bifurcation stenting with the crush technique visualized with 64-slice computed tomography

    DEFF Research Database (Denmark)

    Kristensen, T.S.; Engstrom, T.; Kofoed, Klaus Fuglsang

    2008-01-01

    Acute stent thrombosis remains a potential complication after stent implantation. With the introduction of electrocardiographic gated multidetector row computed tomography (MDCT), a new nonnvasive imaging modality has become available that may contribute to the detection of complications after co...... complex interventional procedures. We present a case where CT angiography was performed just prior to the clinical presentation of acute stent thrombosis in a 55-year-old male who was treated with the crush technique in a bifurcation lesion Udgivelsesdato: 2008/7...

  4. Comparative Analysis of Diagnostic Value of CT and MRI in Cholangiocarcinoma%CT 和 MRI在胆管细胞癌中的诊断价值对比分析

    Institute of Scientific and Technical Information of China (English)

    张海萍

    2013-01-01

      目的探讨64层螺旋CT扫描与MRI扫描在胆管细胞癌中的诊断价值.方法回顾性分析34例胆管细胞癌患者的临床资料,均行64层螺旋CT平扫、动态增强扫描与MRI平扫及动态增强扫描,分析两种检测手段在胆管细胞癌中的诊断效果.结果34例胆管细胞癌患者肿块型发生率明显高于腔内生长型、浸润狭窄型、不明确型,64层螺旋CT扫描的图像质量(Ⅰ级29例、Ⅱ级5例、Ⅲ级0例)明显好于MRI扫描(Ⅰ级16例、Ⅱ级14例、Ⅲ级4例),差异有统计学意义(P<0.05).形状不规则肿块型发生率高于圆形与类圆形肿块型发生率,结节状腔内生长型发生率高于菜花状腔内生长型发生率,片状浸润狭窄型发生率高于星芒状浸润狭窄型发生率,64层螺旋CT扫描的定位准确率和定性准确率均高于MRI扫描,差异均无统计学意义( P>0.05).结论64层螺旋CT扫描与MRI扫描均是胆管细胞癌的有效诊断方法,64层螺旋CT扫描的图像更为清晰,准确性更高.%Objective To investigate the diagnostic value of 64-slice spiral CT scan and MRI scan in cholangiocarcinoma .Method Clinical data of 34 patients with cholangiocarcinoma were retrospectively analyzed.All the patients were examined with 64-slice spiral plain and dynamic enhanced scan ,and MRI plain and dynamic enhanced scan .Effect of the two detection means on the diagnosis of cholangiocarcinoma were analyzed .Results In 34 patients with cholangiocarcinoma , the discovery rate of tumor type was significantly higher than that of intraductal growth type , infiltrating stenosis type and unclear type .The image quality of 64-slice spiral CT scan (grade Ⅰ29 cases,grade Ⅱ5 cases,grade Ⅲ0 case)was significantly better than that of MRI scan (grade Ⅰ16 cases,grade Ⅱ14 cases,grade Ⅲ4 cases).The difference was statistically significant ( P<0 .05 ) .The discovery rate of irregular type was higher

  5. 螺旋CT平扫及重建技术辅助上颌前牙种植15例%Case report of 15 dental implantation assisted with spiral CT in anterior region of maxilla

    Institute of Scientific and Technical Information of China (English)

    王仁欣; 张占利; 董鹏飞

    2013-01-01

    Objective: To evaluate the clinical efficiency of 64-slice spiral CT in the anterior maxilla. Methods:15 patients with delayed implantation in anterior region of maxilla was examed with CT scan and/or 3D reconstruction, and dental implantation doctors account for the complications and assisted surgery operation of implantation, and get the advantage of CT images VS X-Ray. Results: CT images can stereoscopically and directly reveal the height, width and density of the implantation zone,which helps dental implantation doctors to have a fluent communication with patients. Conclusion:CT images can provide reliable evidence for planning a precise surgery and benefit doctors communicating with their patients. CT scan should be suggested an necessary examine in implantation of anterior maxilla.%  目的:探讨采用64排CT平扫及重建技术在上颌前牙种植中应用的临床意义。方法:对我科近2年来上颌前牙延期种植患者术前进行64排CT平扫/(及)重建,根据CT结果,进行术前分析设计,与患者沟通解释种植手术所需要的其他辅助操作及手术并发症,总结CT图像对手术的指导意义及在医患沟通方面的优势。结果:CT扫描能清晰地显示出种植区骨密度、骨厚度及高度情况,有利手术方案的制定,增强了种植医师对手术解释的说服力和医患之间的信任程度,更有利医患沟通。结论:上颌前牙种植前的CT扫描检查对上颌前牙种植的术前指导及医患沟通具有重要的临床意义,建议CT扫描做为上颌前牙种植前的常规检查。

  6. Risk-benefit analysis and cost-effectiveness analysis of lung cancer screening by spiral CT

    International Nuclear Information System (INIS)

    Mass screening of lung cancer has been widely performed using indirect chest X-ray method in Japan. However reduction of the mortality for lung cancer is questioned. We have proposed that recently developed spiral CT should be adopted for the screening of lung cancer, since CT has an excellent detectability for small nodule. Lung Cancer Screening CT (LSCT) has been developed by author's group using spiral CT with low dose and light weight in order to make a mobile unit. In this paper risk-benefit analysis and cost-effectiveness analysis are described for the LSCT screening of lung cancer. As a risk, radiation carcinogenesis due to exposure from LSCT are compared with gain of life-expectancy by screening and men of 40 years or more and women of 45 years or more are justified. The cost per person-year is estimated for LSCT screening which is better than that of present method, although total cost is higher. The LSCT screening could be recommended if total cost is affordable. (author)

  7. The usefulness of thin-section spiral CT in the evaluation of mediastinal lymph node metastasis from non-small cell lung cancer : a prospective study and comparison with thick-section spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ji Hoon; Lee, Jin Sung; Sohn, Kwang Hyun; Park, Seung Il; Song, Koun Sik; Lim, Tae Hwan [Asan Medical Center, College of Medicine, University of Ulsan, Seoul (Korea, Republic of); Kim, Hyae Young [Mokdong Hospital, Ewha Womams University, Seoul (Korea, Republic of)

    2000-05-01

    To compare the accuracy of thick-and thin-section spiral CT and to determine whether, in diagnosing mediastinal lymph node metastasis from non-small cell lung cancer, the latter is superior to the former. Between March 1997 and March 1998, 51 patients with pathologically proven non-small cell lung cancer underwent thoracotomy with full nodal dissection. Thick- and thin-section spiral CT were performed in all patients, with a mean interval of 14 days. The former was performed with 10 mm thickness and 10 mm interval, and the lather with 3 mm thickness and 3 mm interval. Mediastinal lymph nodes were localized according to the lymph node mapping scheme of the American Thoracic Society and were considered positive for metastasis if they exceeded 10 mm in short-axis diameter. A total of 227 mediastinal nodal stations in 51 patients were obtained. Of these, 188 stations included in thin-section spiral CT were analyzed and the prevalence of mediastinal nodal metastasis was found to be 10%. On a station-by-station basis, and for thick- and thin-section spiral CT, respectively, the overall sensitivities of mediastinal lymph node metastasis were 32% and 53% (p less than .05), while specificities were 91% and 92% (p greater than .05). Although there were no statistically significant differences in sensitivity and specificity according to nodal station, thin-section spiral CT tended to be superior to the thick-section type for stations 7 and 10R in terms of sensitivity, and for stations 4L and 5 in terms of specificity. Thin-section spiral CT was more sensitive than thick-section spiral CT is the evaluation of mediastinal lymph node metastasis from non-small cell lung cancer. This may be due to the higher resolution of the former and its ability to discriminate between lymph node and vessel. (author)

  8. Spiral CT scanning technique in the detection of aspiration of LEGO foreign bodies

    International Nuclear Information System (INIS)

    Background:. Radiolucent foreign bodies (FBs) such as plastic objects and toys remain difficult to identify on conventional radiographs of the neck and chest. Children may present with a variety of respiratory complaints, which may or may not be due to a FB. Objective: To determine whether radiolucent FBs such as plastic LEGOs and peanuts can be seen in the tracheobronchial tree or esophagus using low-dose spiral CT, and, if visible, to determine the optimal CT imaging technique. Materials and methods: Multiple spiral sequences were performed while varying the CT parameters and the presence and location of FBs in either the trachea or the esophagus first on a neck phantom and then a cadaver. Sequences were rated by three radiologists blinded to the presence of a FB using a single scoring system. Results: The LEGO was well visualized in the trachea by all three readers (both lung and soft-tissue windowing: combined sensitivity 89 %, combined specificity 89 %) and to a lesser extent in the esophagus (combined sensitivity 31 %, combined specificity 100 %). The peanut was not well visualized (combined sensitivity < 35 %). The optimal technique for visualizing the LEGO was 120 kV, 90 mA, 3-mm collimation, 0.75 s/revolution, and 2.0 pitch. This allowed for coverage of the cadaver tracheobronchial tree (approximately 11 cm) in about 18 s. Although statistical power was low for detecting significant differences, all three readers noted higher average confidence ratings with lung windowing among 18 LEGO-in-trachea scans. Conclusion: Rapid, low-dose spiral CT may be used to visualize LEGO FBs in the airway or esophagus. Peanuts were not well visualized. (orig.)

  9. Nonfunctioning endocrine tumors of the pancreas: possibilities of spiral CT characterization

    Energy Technology Data Exchange (ETDEWEB)

    Procacci, C.; Carbognin, G.; Biasiutti, C.; Bicego, E.; Romano, L.; Guarise, A.; Minniti, S.; Pagnotta, N. [Dept. of Radiology, University of Verona Medical School (Italy); Accordini, S. [Div. of Medical Statistics, University of Verona Medical School (Italy); Falconi, M. [Dept. of Surgical Sciences, University of Verona Medical School (Italy)

    2001-07-01

    The aim of this study was to assess the ability of spiral CT to adequately characterize the nonfunctioning endocrine tumors (NFETs) of the pancreas, distinguishing this lesion from the other pancreatic tumors. The spiral CT examinations of 21 cases of histologically proven NFETs, along with those of 29 cases of other pancreatic tumors and tumor-like lesions, were retrospectively reviewed in a blinded fashion by two radiologists, in order to correctly classify the lesions, highlighting the typical signs reported in the literature. Discordant cases were further analyzed in the presence of a third radiologist. The final diagnosis was acquired by means of a majority or overall consensus. The histopathologic examination was considered the gold standard. The sensitivity, specificity, and positive and negative predictive values of CT were calculated. After the consensus evaluation, the correct diagnosis was reached in 72% of cases, with 10% of nonspecific diagnoses of solid pancreatic tumor and 18% of wrong diagnoses. The sensitivity and specificity of spiral CT in identifying NFETs were 66.6 and 82.7%, respectively. The positive and negative predictive values were 73.7 and 77.4%, respectively. In up to 70% of cases the NFET demonstrates a typical aspect of a mass hyperdense in the arterial contrastographic phase eventually associated with hyperdense hepatic metastases in more than half of the patients. This finding does allow the diagnosis of NFET but without certainty indeed, since other tumors can show a similar densitometric behavior and among them particularly the ductal adenocarcinoma. On the other hand, both the solid, hypovascularized NFETs, and the cystic form, cannot be differentiated from the other solid and cystic tumors of the pancreas. (orig.)

  10. Portal venous calcifications 20 years after portosystemic shunting Demonstration by spiral CT with CT angiography and 3D reconstructions

    International Nuclear Information System (INIS)

    Background: Evaluation of the value of spiral computed tomography (SCT), and postprocessing procedures in patients with extensive portal venous calcifications 20 years after portosystemic shunting was performed. Methods: In two patients spiral CT (SCT) examinations of the abdomen (slice thickness 3 mm, table feed 6 mm/s) were performed prior and after application of 150 ml of contrast material administered at a flow rate of 4 ml/s. Axial images were reconstructed at 2 mm increments for postprocessing procedures and 6 mm increments for axial source images. Postprocessing was performed with a maximum intensity projection (MIP) and shaded surface display (SSD) imaging program. Results: In both cases preoperative plain film radiography of the chest and abdomen showed large curvilinear calcifications located at the upper quadrant of the abdomen. The calcifications were directed along the expected axis and position of the portal vein and the portosystemic venous anastomosis. Axial CT slices and CTA showed that the calcifications were located in the vessel wall and that the portal vein lumen as well as the portosystemic venous anastomosis were patent. Conclusion: Long-standing portal hypertension is capable of causing portal venous calcifications due to mechanical stress to the vessel wall even years after performing portosystemic shunting. Typically, the calcifications are directed along the expected axis and position of the portal vein. SCT of the portal venous system is a reliable method to differentiate between calcifications in a thrombus or in the vessel wall, which may have therapeutic significance

  11. Assessment of right ventricular function for patients with rheumatic mitral stenosis by 64-slice multi-detector row computed tomography: comparison with magnetic resonance imaging

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiao-chun; YANG Zhi-gang; GUO Yin-kun; ZHANG Rui-ming; WANG Jian; ZHOU Dai-quan; CHENG Lin; CHEN Lin

    2012-01-01

    Background Right ventricular (RV) dysfunction ensues due to rheumatic mitral stenosis (RMS).The evaluation of RV function is clinically important for the diagnosis,treatment,and follow-up for patients with different degrees of RMS.Thepurpose of this study was to determine whether the 64-slice multi-detector row computed tomography (64-slice MDCT)can assess the RV function in RMS with high accuracy and reproducibility when compared to MR imaging (MRI).Methods Right ventricular end-diastolic and end-systolic volumes (RV-EDV and RV-ESV),stroke volume (RV-SV),ejection fraction (RV-EF),cardiac output (RV-CO),and wall mass (RV-Mass) were measured with dedicated cardiac analysis software on 64-slice MDCT and compared with values measured with MRI in 43 consecutive patients with RMS.Agreement between MRI and 64-MDCT results were compared with Bland and Altman analysis and linear regression analysis.Repeated measurements were performed to determine intraobserver and interobserver variability.Results No significant differences were revealed in calculated RV function parameters between the two methods.RV-EDV,RV-ESV,RV-SV,RV-EF,RV-CO,and RV-Mass by 64-slice MDCT were similar to those by MRI (P>0.05).There were good correlations (r=0.98,0.97,0.96,0.96,0.95 and 0.77,respectively) and close agreement (bias=-0.2 ml,-1.0ml,0.8 ml,0.5%,26.1 ml,and 0.5 g,respectively,P>0.05).The variability in 64-slice MDCT measurements was similar to that in MRI values.Conclusion ECG-gated 64-slice MDCT could assess the RV function in RMS with high accuracy and reproducibility when compared to MRI.

  12. 64 slice-coronary computed tomography sensitivity and specificity in the evaluation of coronary artery bypass graft stenosis: A meta-analysis.

    Science.gov (United States)

    Barbero, Umberto; Iannaccone, Mario; d'Ascenzo, Fabrizio; Barbero, Cristina; Mohamed, Abdirashid; Annone, Umberto; Benedetto, Sara; Celentani, Dario; Gagliardi, Marco; Moretti, Claudio; Gaita, Fiorenzo

    2016-08-01

    A non-invasive approach to define grafts patency and stenosis in the follow-up of coronary artery bypass graft (CABG) patients may be an interesting alternative to coronary angiography. 64-slice-coronary computed tomography is nowadays a diffused non-invasive method that permits an accurate evaluation of coronary stenosis, due to a high temporal and spatial resolution. However, its sensitivity and specificity in CABG evaluation has to be clearly defined, since published studies used different protocols and scanners. We collected all studies investigating patients with stable symptoms and previous CABG and reporting the comparison between diagnostic performances of invasive coronary angiography and 64-slice-coronary computed tomography. As a result, sensitivity and specificity of 64-slice-coronary computed tomography for CABG occlusion were 0.99 (95% CI 0.97-1.00) and 0.99 (95% CI: 0.99-1.00) with an area under the curve (AUC) of 0.99. 64-slice-coronary computed tomography sensitivity and specificity for the presence of any CABG stenosis >50% were 0.98 (95% CI: 0.97-0.99) and 0.98 (95% CI: 0.96-0.98), while AUC was 0.99. At meta-regression, neither the age nor the time from graft implantation had effect on sensitivity and specificity of 64-slice-coronary computed tomography detection of significant CABG stenosis or occlusion. In conclusion 64-slice-coronary computed tomography confirmed its high sensitivity and specificity in CABG stenosis or occlusion evaluation. PMID:27140337

  13. Dosimetry in dental radiology. Dentascan spiral CT versus panoramic radiography; Dosimetria nella radiologia odontostomatologica: confronto tra tomografia computerizzata spirale e ortopantomografia

    Energy Technology Data Exchange (ETDEWEB)

    Villari, N.; Stecco, A.; Zatelli, G. [Florence Univ., Florence (Italy). Dipt. di fisiopatologia clinica

    1999-05-01

    The study compares the doses absorbed by the dentomaxillary area in spiral CT and panoramic examinations. The dose measurements demonstrate that patients receive smaller doses with panoramic radiography than with spiral CT with Dentascan. After following for some variations from instrumental differences, they are in substantial agreement with literature data. Further investigations are needed considering the radiobiological risk related to the growing spread of Dentascan examinations. [Italian] Questo lavoro intende confrontare le dosi assorbite nel distretto dento-mascellare, con le due principali tecniche utilizzate in questo campo: TC spirale e ortopantomografia. Emerge come l'esame panoramico delle arcate dentarie eseguito con l'ortopantomografo comporti la'ssorbimento di dosi inferiori rispetto a quelle dell'esame TC spirale con programma Dentascan. Questi dati, pur essendo soggetti a variabilita' dovuta alla strumentazione utilizzata, sono paragonabili a quelli di altri studi e impongono ulteriori approfondimenti dato il crescente ricorso degli implantologi alla TC spirale con programma di ricostruzione Dentascan.

  14. Dose reduction in spiral CT angiography of thoracic outlet syndrome by anatomically adapted tube current modulation

    Energy Technology Data Exchange (ETDEWEB)

    Mastora, I.; Remy-Jardin, M.; Remy, J. [Dept. of Radiology, University Center Hospital Calmette, Lille (France); Medical Research Group, Lille (France); Suess, C.; Scherf, C. [Siemens Medical Systems, Forcheim (Germany); Guillot, J.P. [Dept. of Radiology, University Center Hospital Calmette, Lille (France)

    2001-04-01

    The aim of this study was to evaluate dose reduction in spiral CT angiography of the thoracic outlet by on-line tube-current control. Prospectively, 114 patients undergoing spiral CT angiography of the subclavian artery for thoracic outlet arterial syndromes were evaluated with and without tube-current modulation at the same session (scanning parameters for the two successive angiograms, one in the neutral position and one after the postural maneuver): 140 kV; 206 mA; scan time 0.75 s; collimation 3 mm; pitch = (1). The dose reduction system was applied in the neutral position in the first 92 consecutive patients and after postural maneuver in the remaining 22 consecutive patients. Dose reduction and image quality were analyzed in the overall study group (group 1; n = 114). The influence of the arm position was assessed in 44 of the 114 patients (group 2), matched by the transverse diameter of the upper thorax. The mean dose reduction was 33 % in group 1 (range 22-40 %) and 34 % in group 2 (range 26-40 %). In group 2 the only difference in image quality was a significantly higher frequency of graininess on low-dose scans compared with reference scans whatever the patient's arm position, graded as minimal in 38 of the 44 patients (86 %). When the low-dose technique was applied after postural maneuver in group 2: (a) the mean dose reduction was significantly higher (35 vs 32 % in the neutral position; p = 0.006); (b) graininess was less frequent (82 vs 91 % in the neutral position); and (c) the percentage of graininess graded as minimal was significantly higher (83 vs 70 % in the neutral position; p = 0.2027). On-line tube-current modulation enables dose reduction on high-quality, diagnostic spiral CT angiograms of the thoracic outlet and should be applied during data acquisition in the neutral position and after postural maneuver for optimal use. (orig.)

  15. Analysis of value of multislice spiral CT urography in the diagnosis of upper urinary tract obstruction%多层螺旋 CT 泌尿造影对上尿路梗阻性疾病的诊断价值

    Institute of Scientific and Technical Information of China (English)

    张昊

    2016-01-01

    Objective To investigate the feasibility of the implementation of the urinary tract obstruction in multi - slice spiral CT urography (MSCTU)′s. Methods 27 patients were chosen from May 2014 to May 2015 in our hospital and confirmed by upper urinary tract obstruction unex-plained total,the use of 64 - slice spiral CT for patients MSCTU exploration,the acquired image to the workstation volume rendering(VRT),maxi-mum density contrast( MIP)and multiplanar reconstruction(MPR),study the three - dimensional stereoscopic image processing. Results The group of 27 cases,there are 13 cases belong to urinary stones,five cases belong to congenital malformations,three cases belong to the ureter in-flammatory / adhesions stenosis,and renal cysts huge,extrinsic compression and ureteral tumors in 2 cases. MSCTU diagnosis consistent 27 patients with surgical pathology. Conclusion Patients with upper urinary tract obstruction implementation MSCTU inspection,diagnosis and dif erential value highly suitable for universal use.%目的:探讨在上尿路梗阻性疾病中实施多层螺旋 CT 泌尿造影(MSCTU)的可行性。方法选取2014年5月至2015年5月收录并证实上尿路不明原因梗阻的患者共27例,使用64层螺旋 CT 机对患者进行MSCTU 探查,将获取的图像送至工作站进行容积再现( VRT)、最大密度造影(MIP)与多平面重建(MPR),研究三维处理后的立体图像。结果27例病例中,有13例为泌尿系结石,5例为先天性畸形,3例为输尿管炎性/粘连狭窄,肾巨大囊肿、外源性压迫与输尿管肿瘤各2例。27例患者的 MSCTU 诊断结果与手术病理一致。结论对上尿路梗阻性疾病患者实施 MSCTU 检查,有高度的诊断与鉴别价值,适合普及使用。

  16. Noninvasive detection of coronary abnormalities in pediatric patients with Kawassaki disease using multi-slice spiral CT

    International Nuclear Information System (INIS)

    Objective: To evaluate the feasibility and value of detecting coronary artery lesions in Kawasaki disease using multi-slice computed tomography (MSCT). Methods: Thirty-four pediatric patients underwent 16-slice or 64-slice CT coronary, angiography. 18 patients were also examined with 2 dimension echocardiography (2DE). In all cases, visibility of coronary artery segment was recorded. The diameter of the LCA, RCA were measured in MSCTA and compared with 2DE. Correlation coefficient of dimension and coincidence rate of two methods were calculated. Results: Coronary artery lesions were found in 14 patients (22 branches) of the 34 cases with KD on MSCT. Six cases were dialated, 3 cases were dialated with aneurysms, 2 cases had aneurysms without dialation. Coronary artery stenosis in 1 eases, calcification in 2 cases. Three cases had multiple aneurysms with the presence of alternate stenosis that made the artery a bead-like appearance. CC of LM and RCA were 0.85, 0.91, respectively (P>0.05). Three coronary artery aneurysm in the distal RCA was missed by 2DE. MSCT could not detect slight or moderate mitral regurgitation in 2 patients and artery wall thickening in 5 patients. Conclusion: MSCT would be an effective complementary or alternative method for CDEC to evaluate coronary artery lesions non-invasively in pediatric patients with Kawasaki disease. (authors)

  17. Hemodynamic study of hepatocellular car-cinoma nodules by multi-slice spiral computed tomographic perfusion

    Institute of Scientific and Technical Information of China (English)

    马国林

    2013-01-01

    Objective To analyze the 64-slice computed tomographic(CT) perfusion parameters of hepatocellular carcinoma(HCC) nodule so as to assess the diagnostic value of hemodynamic changes of HCC nodule by this perfusion

  18. A case of occult insulinoma localized by pancreatic dynamic enhanced spiral CT

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Insulinomas are the most common category of pancreatic endocrine tumors,with an annual incidence of 1-4 cases per million people.Most are intrapancreatic,benign and solitary.Therefore,they have an excellent prognosis after surgical resection.However,the localization diagnosis of insulinomas still poses a challenge to surgeons and radiologists.In this case,the tumor was occult and could not be found by either abdominal enhanced spiral computed tomography(CT)or ultrasonography.Therefore,we tried a new method ...

  19. Kontrastmittel-MRT (MnDPDP) in der Detektion von Lebermetastasen kolorektaler Karzinome im Vergleich zu Ultraschall, Spiral-CT, Spiral-CTAP und operativem Befund

    OpenAIRE

    Kramer, Hubertus

    2005-01-01

    30 Patienten mit gesichertem kolorektalem Karzinom und V.a.Lebermetastasen wurden zusätzlich zur etablierten präoperativen Diagnostik mit Ultraschall, Spiral-CT und Spiral-CTAP mit MnDPDP verstärkter MRT der Leber untersucht. Bei 18 Patienten konnte eine zeitnahe intraoperative Beurteilung der Leber durchgeführt werden. Es zeigte sich, dass die MRT+MnDPDP der SCTAP bei der Entdeckung von Lebermetastasen zumindest gleichwertig ist. Im Vergleich zu den anderen Verfahren resultierte aufgrund bes...

  20. CT Angiography of the Coronary Arteries

    Directory of Open Access Journals (Sweden)

    H.Ghanaati

    2005-08-01

    Full Text Available Introduction & Background: Cardiac imaging is currently one the most rapidly advancing fields in clinical cardiology. Continuing technical innovations are expanding the applicability and usefulness of non-invasive imaging modalities such as ultrasound, nuclear imaging, positron emis-sion tomography Magnetic Resonance Imaging and most recently computed tomography (CT. In 1998, the 4-slice spiral CT scanners were introduced with a rotation time of 500ms a collimated detector width varying from 0.5 to 1.25mm. In 2002, the 16-slice spiral CT scanners were first used for coronary imag-ing. The rotation time and some of these scanners is now less than 400ms, the slice thickness varies be-tween 0.5 and 0.75mm, and a complete cardiac scan can be performed in less than 20s. In 2004, 64-slice spiral CT released into the market. Imaging of the heart requires acquisition or image reconstruction that is synchronized to the motion of the heart. Nie-man et al, irrespectively of the image quality, evalu-ated all branches with a minimal luminal diameter of 2.0mm and sensitivity and specificity of 95% and 86% respectively in comparison to angiography.

  1. Detection of colorectal liver metastases: a prospective multicenter trial comparing unenhanced MRI, MnDPDP-enhanced MRI, and spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Bartolozzi, Carlo; Donati, Francescamaria; Cioni, Dania; Lencioni, Riccardo [Department of Radiology, University of Pisa, Via Roma 67, 56100, Pisa (Italy); Procacci, Carlo; Morana, Giovanni [Department of Radiology, University of Verona, Piazzale L.A. Scuro 1, 37134, Verona (Italy); Chiesa, Antonio; Grazioli, Luigi [Department of Radiology, University of Brescia, Piazzale Spedali Civili 1, 25023, Brescia (Italy); Cittadini, Giorgio; Cittadini, Giuseppe [Department of Radiology, University of Genova, Largo R. Benzi 10, 16132, Genova (Italy); Giovagnoni, Andrea [Department of Radiology, University of Ancona, Concam, Torrette, 60020, Ancona (Italy); Gandini, Giovanni; Maass, Jochen [Department of Radiology, University of Torino, Genova 3, 10110, Torino (Italy)

    2004-01-01

    The aim of this study was to compare unenhanced MRI, MnDPDP-enhanced MRI, and spiral CT in the detection of hepatic colorectal metastases. Forty-four patients with hepatic colorectal metastases were examined with unenhanced and MnDPDP-enhanced MRI and with unenhanced and contrast-enhanced spiral CT. The MR examination protocol included baseline T1-weighted spin-echo (SE), T1-weighted gradient-recalled-echo (GRE), and T2-weighted fast-SE sequences; and T1-weighted SE and T1-weighted GRE sequences obtained 30-60 min after administration of 0.5 {mu}mol/kg (0.5 ml/kg) mangafodipir trisodium (MnDPDP). Images were interpreted by three blinded readers. Findings at CT and MRI were compared with those at intraoperative US, which were used as term of reference. Intraoperative US detected 128 metastases. In a lesion-by-lesion analysis, the overall detection rate was 71% (91 of 128) for spiral CT, 72% (92 of 128) for unenhanced MRI, and 90% (115 of 128) for MnDPDP-enhanced MRI. MnDPDP-enhanced MRI was more sensitive than either unenhanced MRI (p<0.0001) or spiral CT (p=0.0007). In a patient-by-patient analysis, agreement with gold standard was higher for MnDPDP-enhanced MRI (33 of 44 cases) than for spiral CT (22 of 44 cases, p=0.0023) and unenhanced MRI (21 of 44 cases, p=0.0013). MnDPDP-enhanced MRI is superior to unenhanced MRI and spiral CT in the detection of hepatic colorectal metastases. (orig.)

  2. Multi-slice spiral CT appearances of pulmonary infections after liver transplantation

    International Nuclear Information System (INIS)

    Objective: To investigate multi-slice spiral CT (MSCT) appearances of pulmonary infections after liver transplantation (LT) and the diagnostic values of MSCT. Methods: The clinical data and CT images of liver transplantation receptors were reviewed from 2001 August to 2007 June, the types, onset time and CT appearances of pulmonary infections were analyzed retrospectively. Chi square test was used for the statistics. Results: The incidence rate of pulmonary infections after LT was 32.9% (174/529), the mortality was 9.8% (17/174), The incidence of bacterial infection, fungus or associated fungus infection, and virus or associated virus infection were 17.2% (n=91), 14.7% (n=78)and 2.3% (n=12)respectively, the pulmonary infections were seen in 64.7%, 28.7% and 6.6% of patients 1 to 30 days, 31-90 days and after 90 days following LT. Consolidations (n=32), ground-glass opacities (n= 22), nodules (n=10), reticular or lineal opacities (n=4) were found in 45 patients who had CT examination, there were no statistic differences in incidence rate between bacterial infection and mycotic infection (P>0.05). Conclusion: Pulmonary bacterial and fungus infection are common after LT, and often present as the mixed infection, the high risk period for infection is within 30 days after LT, thoracic CT scan is very important for characterizing the pulmonary infections after LT. (authors)

  3. Value of multidetector spiral CT in diagnosis of acute thoracolumbar spinal fracture and fracture-dislocation

    Institute of Scientific and Technical Information of China (English)

    龚静山; 徐坚民

    2004-01-01

    Objective:To investigate the diagnostic value of multidetector spiral CT (MSCT) in acute thoracolumbar spinal fracture and fracture-dislocation.Methods: CT imaging files of 152 consecutive traumatic patients with thoracolumbar fractures were retrospectively reviewed. MSCT scannings were performed with a collimation of 3-5 mm and a pitch of 5.5. The postprocessing included sagittal and coronal multiplannar reconstruction, and 3-D reconstruction.Result: There were 88 cases of compression fracture, 54 cases of burst fracture and 10 cases of fracasdislocation. Transverse images of MSCT could visualize all fractures directly and determine whether spinal canal was intact. Postprocessing image was helpful in depicting the displacement of fragment and orientation of dislocation.Conclusions: MSCT plays an important role in diagnosis and management of acute thoracolumbar spinal fracture and fracture-dislocation.

  4. Correlation between Dynamic Spiral-CT Enhancement Parameters and Tumor Angiogenesis in Renal Cell Carcinomas

    Institute of Scientific and Technical Information of China (English)

    Jinhong Wang; Weixia Chen; Xiuhui Zhang; Pengqiu Min; Rongbo Liu; Hengxuan Yang

    2005-01-01

    OBJECTIVE To prospectively investigate the correlation between the enhancement parameters of a dynamic-CT (D-CT) scan for renal cell carcinomas (RCC) and the carcinoma tissue microvessel density (MVD) in renal cell carcinomas (RCC).METHODS Twenty-four cases of renal cell carcinoma verifyied by histopathology were scanned via dynamic-CT, followed by a whole kidney scan. Enhancement parameters were derived as follows .The slope of the contrast media uptake curve (S), area under the curve(AR), the density difference before and after tissue enhancement (△HU) and tissue blood ratio (TBR) were calculated for all lesions. Time-density curve types were ranked from the lowest to the highest of the slope of the contrast media uptake curve (S) as type A, B and C. Pathologic slides corresponding to the CT imagings were subjected to CD34 monoclonal antibodies, then were evaluated with an image analyzer to count hot spots of MVD. By using the Spearman rank correlation tests, statistical analysis was performed to determine the strength of the relationship between enhancement parameters and MVD determinations.RESULTS The carcinoma tissue MVD showed a direct correlation with the enhancement parameters of D-CT (r=0.54, r=0.62, r=0.55, r=0.64, r=0.44,P< 0.05). Moreover the S, △HU, TBR and type curves all demonstrated a strong correlation with the MVD. By analyzing the various enhancement parameters of the time-density curves, the relationship between the enhancement CT parameters corresponding to the tumor's MVD was identified.CONCLUSION A dynamic spiral-CT scan may be a helpful method as a measurement of tumor angiogenesis in vivo in RCC.

  5. Spiral CT features of abdomen after whipple's operation

    Energy Technology Data Exchange (ETDEWEB)

    Kim, T. H.; Lee, K. Y.; Shin, K. H.; Jung, M. H.; Park, C. M.; Cha, I. H. [Korea Univ. College of Medicine, Seoul (Korea, Republic of)

    1997-04-01

    To assess the CT features of postoperative anatomical changes, surgical complications, and patterns of tumor recurrence after Whipple's operation. 42 spiral CT scans of 31 patients who had undergone Whipple's operation were retrospectively reviewed. Postoperative diagnoses were distal CBD cancer in 13 patients, cancer of the ampulla of Vater in ten, cancer of the head of the pancreas in seven, and microcystic cystadenocarcinoma of the pancreas in one. Time intervals between surgery and CT ranged from 1 week to 5 years. CT features of postoperative anastomotic changes, surgical complications, and patterns of tumor recurrence were analyzed. Gastro- or duodeno-jejunal anastomosis was seen in 32 CT scans(74%), pancreaticojejunostomy in 27(64%), and choledochojejunostomy in 24(57%). Pneumobilia was seen in ten patients(34%). Abnormal fluid collections in the peripancreatic and perihepatic space were demonstrated in two patients who underwent CT scans within 3 weeks after operation. Other complications included wound abscess(n=2), and portal vein occlusion(n=1). The most common site of metastasis was the lymph node(n=8)(retroperitoneal:n=5; mesentery root:n=4; and celiac:n=2), followed by the liver(n=6), peritoneum(n=3), adrenal gland(n=2), and afferent loop(n=1). In three cases, there was local recurrence in the pancreatic bed. To reduce possible diagnostic errors during CT interpretation, a Knowledge of normal postoperative anatomy, common complications, and patterns of disease recurrence following Whipple's operation is important.

  6. The clinical application of multi-slice spiral CT angiography in abdominal aortic disease

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Objective: To evaluate the clinical application of multi-slice spiral CT angiography(MSCTA) in the assessment of abdominal aortic disease. Methods: Fifty-four patients underwent multi-slice spiral CT angiography of abdomen. Contrast agent (Omnipaque 300 I g/L) 1.5 ml/kg was injected and the injection rate was 3 ml/s. The delay time was determined by bolus tracking technique,Tll level abdominal aorta was set as the target vessel and the threshold was 180-200 Hu, slice width was 3 mm and with a pitch of 4-6.Original data were transferred to working-station to perform functional reconstruction. Results: Ten cases were normal, twenty-eight cases were abdominal aortic aneurysms, five abdominal aortic dissecting aneurysms (Debakay type Ⅲ ) and eleven aortic sclerosis. SSD showed the body of aneurysm and the relationship between aneurysm and adjacent blood vessel, MIP better displayed calcification of blood vessel wall and condition of the stent, MPR demonstrated true and false lumen, rupture site of abdominal aorta intima and mural thrombus. Conclusion: MSCTA axial and reconstruction image can show the extent of abdominal aortic disease and the relationship with adjacent blood vessels. It is a safe, simple and non-invasive examination method.

  7. Non-invasive Detection of Aortic and Coronary Atherosclerosis in Homozygous Familial Hypercholesterolemia by 64 Slice Multi-detector Row Computed Tomography Angiography

    Science.gov (United States)

    Homozygous familial hypercholesterolemia (HoFH) is a rare disorder characterized by the early onset of atherosclerosis, often at the ostia of coronary arteries. In this study we document for the first time that aortic and coronary atherosclerosis can be detected using 64 slice multiple detector-row ...

  8. The influence of heart rate, slice thickness, and calcification density on calcium scores using 64-slice multidetector computed tomography - A systematic phantom study

    NARCIS (Netherlands)

    Groen, Jaap M.; Greuter, Marcel J.; Schmidt, Bernhard; Suess, Christoph; Vliegenthart, Rozemarijn; Oudkerk, Matthis

    2007-01-01

    Objective: The purpose of this study was to investigate the influence of heart rate, slice thickness, and calcification density on absolute value and variability of calcium score using 64-slice multidetector computed tomography (MDCT). Methods and Materials: Three artificial arteries containing each

  9. Diagnostic accuracy of 64-slice computed tomography coronary angiography for the detection of in-stent restenosis: A meta-analysis

    NARCIS (Netherlands)

    N. Carrabba (Nazario); J.D. Schuijf (Joanne); F.R. de Graaf (Fleur); G. Parodi (Guido); E. Maffei (Erica); R. Valenti (Renato); A. Palumbo (Alessandro); A.C. Weustink (Annick); N.R.A. Mollet (Nico); G. Accetta (Gabriele); F. Cademartiri (Filippo); D. Antoniucci (David); J.J. Bax (Jeroen)

    2010-01-01

    textabstractBackground: We sought to evaluate the diagnostic accuracy of 64-slice multi-detector row computed tomography (MDCT) compared with invasive coronary angiography for in-stent restenosis (ISR) detection. Methods: MEDLINE, Cochrane library, and BioMed Central database searches were performed

  10. Non-invasive detection of aortic and coronary atherosclerosis in homozygous familial hypercholesterolemia by 64 slice multi-detector row computed tomography angiography

    Science.gov (United States)

    Homozygous familial hypercholesterolemia (HoFH) is a rare disorder characterized by the early onset of atherosclerosis, often at the ostia of coronary arteries. In this study we document for the first time that aortic and coronary atherosclerosis can be detected using 64 slice multiple detector row ...

  11. Three-dimensional cholangio-spiral CT demonstration of a post-traumatic bile leak in a child

    International Nuclear Information System (INIS)

    Bilioma is a rare complication of traumatic liver injury, and the precise site of bile leak is often difficult to demonstrate with a non-invasive technique. We report a case of post-traumatic bile leak in a 15-year-old girl in whom spiral CT after intravenous cholangiography allowed excellent preoperative demonstration of the extent of the liver rupture and an exact location of the bile leak. We think that spiral-CT cholangiography could be an accurate, non-invasive technique to investigate the biliary system in cases of paediatric liver trauma. (orig.) (orig.)

  12. Multislice spiral CT virtual endoscopy: the clinical application in the diagnosis of vascular diseases

    International Nuclear Information System (INIS)

    Objective: To evaluate the display ability and the clinical application of multislice spiral CT virtual endoscopy (CTVE) in the diagnosis of vascular diseases. Methods: Fifty-six patients were examined by CT virtual endoscopy. 32 patients also had DSA for comparison. 18 patients were confirmed by operation (3 patients also had DSA). 9 patients with pulmonary embolism were confirmed by other examinations and treatments. Results: 56 patients showed successful CT virtual endoscopy images. CT virtual endoscopy images could clearly show the inner wall and inner structures of the vessels, mural thrombus, calcification form, stenosis of the vessels, the true and false lumina of aortic dissections, the lesion of false aneurysm, and the anatomic relationship between the lesion and surrounding structures of the normal vessels. Out of the 32 patients with vessel abnormalities on DSA, 24 patients (75%) showed the lesions on CTVE. 17 out of 18 patients with operation showed the lesions on CTVE. All 9 patients with pulmonary embolism showed the abnormalities on CTVE. Chi-square test: χ2=5.2809, P=0.071 patients showed the vascular diseases on CTVE in 56 patients (84%). Conclusion: MSCT virtual endoscopy could provide more information of the vessel by displaying the inner wall and allowing users to map the vessels in a display. It is helpful in correct diagnosis and guiding surgery

  13. Malignant focal hepatic lesions complicating underlying liver disease: dual-phase contrast-enhanced spiral CT sensitivity and specificity in orthotopic liver transplant patients

    International Nuclear Information System (INIS)

    The aim of this study was to determine the accuracy of contrast-enhanced biphasic spiral CT as a screening tool in the preoperative evaluation of orthotopic liver transplant (OLT) patients. Spiral-CT examinations were performed before liver transplantation in 53 patients. Scans were retrospectively reviewed and compared with pathologic findings in fresh-sectioned livers. When findings between spiral CT and pathology were discordant, formalized livers were reexamined with lesion-by lesion evaluation. Fresh pathologic evaluation revealed 23 liver lesions (16 HCC, 7 macro-regenerative nodules). Malignancy was identified in 13 of 53 patients (24.5%). Pre-transplantation spiral CT depicted 27 liver lesions (23 HCC, 4 macro-regenerative nodules). Malignancy was suspected in 14 patients (26.4%). In 10 of 53 (18.9%), spiral CT and pathologic evaluation were discordant. Subsequent retrospective pathologic evaluation showed malignancy in 4 additional patients. Spiral CT compared with the retrospective pathologic findings revealed 36 real-negative, 14 real-positive, 0 false-positive, and 3 false-negative patients with malignancy. Sensitivity and specificity of spiral CT in detection of malignancy was 82 and 100%, respectively. Contrast-enhanced biphasic spiral CT is an accurate technique in the evaluation of patients preceding OLT. Routine fresh-sectioned liver pathologic findings are not as sensitive as previously estimated. (orig.)

  14. Malignant focal hepatic lesions complicating underlying liver disease: dual-phase contrast-enhanced spiral CT sensitivity and specificity in orthotopic liver transplant patients

    Energy Technology Data Exchange (ETDEWEB)

    Mortele, K.J. [Dept. of Radiology, University Hospital Gent (Belgium); Department of Radiology, Brigham and Women' s Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115 (United States); De Keukeleire, K. [Dept. of Radiology, University Hospital Gent (Belgium); Praet, M. [Dept. of Pathology, University Hospital Gent, Gent (Belgium); Van Vlierberghe, H. [Dept. of Gastroenterology, University Hospital Gent, Gent (Belgium); Hemptinne, B. de [Dept. of Surgery, University Hospital Gent, Gent (Belgium); Ros, P.R. [Department of Radiology, Brigham and Women' s Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115 (United States)

    2001-09-01

    The aim of this study was to determine the accuracy of contrast-enhanced biphasic spiral CT as a screening tool in the preoperative evaluation of orthotopic liver transplant (OLT) patients. Spiral-CT examinations were performed before liver transplantation in 53 patients. Scans were retrospectively reviewed and compared with pathologic findings in fresh-sectioned livers. When findings between spiral CT and pathology were discordant, formalized livers were reexamined with lesion-by lesion evaluation. Fresh pathologic evaluation revealed 23 liver lesions (16 HCC, 7 macro-regenerative nodules). Malignancy was identified in 13 of 53 patients (24.5%). Pre-transplantation spiral CT depicted 27 liver lesions (23 HCC, 4 macro-regenerative nodules). Malignancy was suspected in 14 patients (26.4%). In 10 of 53 (18.9%), spiral CT and pathologic evaluation were discordant. Subsequent retrospective pathologic evaluation showed malignancy in 4 additional patients. Spiral CT compared with the retrospective pathologic findings revealed 36 real-negative, 14 real-positive, 0 false-positive, and 3 false-negative patients with malignancy. Sensitivity and specificity of spiral CT in detection of malignancy was 82 and 100%, respectively. Contrast-enhanced biphasic spiral CT is an accurate technique in the evaluation of patients preceding OLT. Routine fresh-sectioned liver pathologic findings are not as sensitive as previously estimated. (orig.)

  15. The usefulness of levin tube inserted drip infusion spiral CT: comparison with conventional method in subtotal gastrectomy patients

    Energy Technology Data Exchange (ETDEWEB)

    Park, Young Jin; Kim, Young Hwan; Yoon, Jung Hee; Cha, Soon Joo; Kim, Jeong Sook [Sanggye Paik Hospital, Seoul (Korea, Republic of); Kim, Sung Rok; Hur, Gham; Rhim, Hyun Chul [Hanyang University Hospital, Seoul (Korea, Republic of)

    1998-04-01

    The purpose of this study is to access the usefulness of newly designed Levin tube inserted drip infusion spiral CT for the evaluation of remnant stomach and anastomosis site in patients who have undergone subtotal gastrectomy for stomach cancer. A new technique named Levin tube inserted drip infusion spiral CT was used to prospectively study 23 patients. A 16Fr Levin tube was inserted into the remnant stomach; 500 ml of tap water was drip infused just before CT scanning and an additional 500 ml of water was infused during IV contrast injection. Water was infused by gravity, using a water bottle suspended at a height of 90 cm (Group A). The 31 patients who underwent conventional spiral CT scanning immediately after the divided ingestion of 900 ml diluted gastrografin were selected as a control group (Group B). The anatomic delineation of the anastomosis site was graded by two radiologists as excellent (3), good(2), fair (1) or poor (0). To evaluate the degree of distension, the maximal diameters of remnant stomach and the anastomosis site, and the thickness of the stomach wall, were also measured. In patients who had undergone subtobal gastrectomy, Levin tube inserted drip infusion spiral CT showed excellent anatomic delineation of the site of anastomosis and remnant stomach. We found that because it increases the distension of remnant stomach and the anastomosis site, this technique is effective for the evaluation of postoperative stomach. (author). 10 refs., 2 tabs., 3 figs.

  16. Multi-slice spiral CT perfusion imaging of chronic obstructive pulmonary disease

    International Nuclear Information System (INIS)

    Objective: To evaluate the diagnostic value of multi-slice spiral CT (MSCT) perfusion imaging in chronic obstructive pulmonary disease (COPD). Methods: Twenty COPD patients and 20 volunteers underwent 8-row detector spiral CT (MSCT) perfusion imaging using cine scan mode with 5 mm slice thickness, 0.5 s rotation time and a total scan time of 45 s with 5 s intervals. 60 ml contrast agent (300 nag I/ml) were administered at a rate of 4 ml/s from the forearm superficial vein. The imaging data were transferred to a workstation. A time-density curve and pseudo-color map were generated automatically with GE CT perfusion 3 software, the blood flow (BF), blood volume (BV), mean transit time (MTT) and permeability surface (PS) were measured. Results: Time-density curve was flatter and the peak of the curve was obviously lower in COPD patients than the volunteers. The BF, BV, PS in COPD patients was (24.77±11.49) ml·min-1·100 g-1, (2.48±1.02) ml/100 g and (2.75±1.13) ml· min-1·100 g-1 respectively. In volunteers was (290.14±107.59) ml·min-1·100 g-1, (16.51 ± 5.98) ml/100 g, (8.80±3.03) ml·min-1·100 g-1 respectively. The MTT in COPD patients and volunteers was (10.58±4.85) s and (4.50±1.71)s respectively. The BF, BV and PS in COPD patients was lower than the volunteers, the MTY was higher (P<0.01). Conclusion: MSCT perfusion imaging is helpful for the diagnosis of COPD. (authors)

  17. Spiral hydro-CT of the pancreas in the thin-slice method; Hydrospiral-CT des Pankreas in Duennschichttechnik

    Energy Technology Data Exchange (ETDEWEB)

    Richter, G.M. [Abt. fuer Radiodiagnostik, Radiologische Universitaetsklinik Heidelberg (Germany); Simon, C. [Abt. fuer Radiodiagnostik, Radiologische Universitaetsklinik Heidelberg (Germany)]|[Abt. Allgemeine Chirurgie, Chirurgische Universitaetsklinik Heidelberg (Germany); Hoffmann, V. [Abt. fuer Radiodiagnostik, Radiologische Universitaetsklinik Heidelberg (Germany); DeBernardinis, M. [Abt. fuer Radiodiagnostik, Radiologische Universitaetsklinik Heidelberg (Germany); Seelos, R. [Abt. Allgemeine Chirurgie, Chirurgische Universitaetsklinik Heidelberg (Germany); Senninger, N. [Abt. Allgemeine Chirurgie, Chirurgische Universitaetsklinik Heidelberg (Germany); Kauffmann, G.W. [Abt. fuer Radiodiagnostik, Radiologische Universitaetsklinik Heidelberg (Germany)

    1996-05-01

    In an open prospective study, 151 patients with a suspected pancreatic neoplasm based on clinical, laboratory or other imaging data were examined between May 94 and October 95. Our newly developed Hydro-CT methodology included intravenous injection of 40 mg N-butylscopolaminium bromide (Buscopan) for intestinal paralysis, gastric and duodenal wall distension by oral administration of an average of 1.5 l warm tap water, 30 RAO patient positioning, an individualized contrast injection technique as determined beforehand by time-to-peak measurement in the portal vein and thin-slice spiral CT (3 mm increment, 6 mm table feed and 3 mm secondary reconstruction). A detailed evaluation form was used to assess (1) tumor detection rate, (2) differentiation of malignant versus benign disease, (3) differential diagnosis, and (4) accuracy of assessment of resectability by identification of infiltration into adjacent organs and vessel structures relevant for resectability such as splenic, superior mesenteric, portal vein and celiac trunk, superior mesenteric, splenic and hepatic arteries. As the gold standard for positive tumor detection surgery and microscopic diagnosis were used, and for negative tumor detection an event-free survival of 6 months. Almost all examinations were well tolerated. In only 4% was on-site administration of a gastric tube required because of vomiting. In 2% of the patients a slight allergic reaction to be contrast medium was seen. The prevalence of a pancreatic neoplasm was 38%. In tumor detection Hydro-CT reached an overall accuracy of 97.4% with a sensitivity of 100% and a specificity of 95.9%. In the differentiation of benign versus malignant disease Hydro-CT reached an overall accuracy of 89.7% with a sensitivity of 92.5% and a specificity of 83.3%. The prevalence of a pancreatic carcinoma was 24%; 4% other malignant tumors were found (distal common bile duct carcinoma, cystadenocarcinoma). (orig./MG) [Deutsch] Von Mai 1994 bis Oktober 1995 wurden

  18. Pulmonary emphysema quantitation with Computed Tomography. Comparison between the visual score with high resolution CT, expiratory density mask with spiral CT and lung function studies

    International Nuclear Information System (INIS)

    CT is the most accurate method to detect pulmonary emphysema in vivo. They compared prospectively two different methods for emphysema quantitation in 5 normal volunteers and 20 consecutive patients with chronic obstructive pulmonary disease (COPD). All subjects were submitted to function tests and HRCT; three scans were acquired at preselected levels during inspiration. The type and extent of pulmonary emphysema were defined by two independent observers under blind conditions. Disagreements were subsequently settled by consent. All subjects were also examined with expiratory spiral CT using a density mask program, at two different cut-off levels (-850,-900 HU). Visual score and expiratory spiral density mask values (-850 HU) were significantly correlated (r = 0.86), but the visual extent of emphysema was always higher than shown by expiratory spiral CT. The emphysema extent assessed with both CT methods correlated with the function result of expiratory airflow obstruction and gas diffusion impairment (visual score versus forced expiratory volume in one second: r = -0.81, versus single breath carbon monoxide diffusion: r = -0.78. Spiral expiratory density mask -850 HU versus forced expiratory volume in one second: r = -0.85 versus single breath carbon monoxide diffusion: r = -0.77). When -900 HU was used as the cut-off value for the expiratory density mask, the correlation with single breath carbon monoxide diffusion worsened (r = -0.56). Visual score and expiratory density mask -850 HU gave similar results and permitted COPD patients to be clearly distinguished from normal controls (p < 0.01). They believe the true residual volume should lie somewhere in between the CT value and the function results with the helium dilution technique and conclude that the extent of pulmonary emphysema can be confidently assessed with CT methods. Finally, the simple visual score may be as reliable as such highly sophisticated new methods as the spiral expiratory density mask

  19. Reduced volume of contrast media; effect on vascular opacification and image quality in spiral CT of the chest

    International Nuclear Information System (INIS)

    To evaluate the effect of reduced volume of contrast media on vascular opacification and image quality in spiral CT of the chest. Sixty patients referred for chest CT were examined with spiral CT with 60ml (n=30) or 90ml(n=30) of 30% ionic contrast media(Rayvist 300r, Schering, Germany) alternately. Injection rate of each group was as follows; 2.0ml/sec for 20 seconds followed by 1.0ml/sec for 20 seconds in 60ml group and 2.0ml/sec for 45 seconds in 90ml group. Twenty-five seconds scanning delay was employed. For the objective comparison of vascular opacification, CT numbers were measured at superior vena cava, ascending and descending aorta, right and left pulmonary artery, left atrium, and inferior vena cava. For the subjective comparison three radiologists scored the grade of vascular opacification and image quality blindly and independently. All data were analyzed statistically. The mean values of measured CT numbers in 90ml group were higher than those in 60ml group (p<.05) at the same level. The overall mean score of vascular opacification in 90ml group was 2.86, and 2.31 in 60ml group(p<.0001). In the overall mean score of image quality, there was no statistically significant difference between 90ml group(2.46) and 60ml group(2.40). Although there is some degradation of vascular opacification in 60ml group, overall image quality is not degraded. Therefore, 60ml of contrast media can be used in spiral CT of the chest without degradation of overall image quality except in spiral CT angiography

  20. Evaluation of image quality and dose in renal colic: comparison of different spiral-CT protocols

    Energy Technology Data Exchange (ETDEWEB)

    Rimondini, A.; Mucelli, R.P.; Dalla Palma, L. [Dept. of Radiology, University of Trieste (Italy); De Denaro, M.; Bregant, P. [Dept. of Medical Physics, Ospedale Maggiore, Trieste (Italy)

    2001-07-01

    The aim of this study was to test different technical spiral-CT parameters to obtain optimal image quality with reduced X-ray dose. Images were acquired with a spiral-CT system Philips Tomoscan AVE1, using 250 mA, 120 kV, and 1-s rotational time. Three protocols were tested: protocol A with 5-mm thickness, pitch 1.6, slice reconstruction every 2.5 mm; protocol B with 3-mm thickness, pitch 1.6, slice reconstruction every 1.5 mm; and protocol C with 3-mm thickness, pitch 2, slice reconstruction every 1.5 mm. Two phantoms were employed to evaluate the image quality. Axial images were acquired, then sagittal and coronal images were reconstructed. Finally, the absorbed X-ray dose for each protocol was measured. Regarding image quality, 5-mm-thick images (protocol A) showed greater spatial resolution and lower noise compared with 3-mm-thick images (protocols B and C) on the axial plane; 3-mm reconstructed sagittal and coronal images (protocols B and C) showed an improved image quality compared with 5-mm reformatted images (protocol A). Concerning X-ray dose, the mean dose was: protocol A 19.6{+-}0.8 mGy; protocol B 14.4{+-}0.6 mGy; protocol C 12.5{+-}1.0 mGy. Our study supports the use of thin slices (3 mm) combined with pitch of 1.6 or 2 in renal colic for X-ray dose reduction to the patient and good image quality. (orig.)

  1. Multi-slice spiral CT angiography: clinical application and the evaluation

    International Nuclear Information System (INIS)

    Objective: To evaluate the clinical application of multi-slice spiral CT angiography (MSCTA) in diagnosis of vascular diseases. Methods: Imaging materials of multi-slice spiral CT angiography of 73 cases were retrospectively analyzed, including 27 cases of intracranial vascular CTA, 8 of carotid CTA, 10 of pulmonary artery CTA, 6 of coronary artery CTA, 11 of aortic CTA, and 11 of low extremity artery CTA. After the raw data was reconstructed by overlapping slice-chickness, the axial images were uploaded to workstation for post data processing, and were then evaluated and reconstructed using 3D software including maximum intensity projection (MIP), shaded surface display (SSD), and volume rendering technique (VRT). Results: The blood vessels were successfully demonstrated in 71 cases out of 73. Abnormality was found in 63 cases out of 71. The intracranial CTA showed aneurysm in 7 cases, arteriovenous malformation in 5, carotid-cavernous fistula in 2, cerebral vascular occlusion in 2, astrocytoma in 2, and meningioma in 3. The carotid CTA revealed carotid stenosis in 4 cases, vertebral artery stenosis in 2 and a post-bracket implantation subclavian artery. In pulmonary artery CTA, pulmonary artery embolism and 5 cases of pulmonary artery involved with lung cancer were seen in 3 cases. In coronary artery CTA, coronary artery stenosis were shown in 3 cases. The aortic CTA demonstrated aortic dissection in 4, aortic stenosis calcification in 5, aortic aneurysm in 2, liver cancer in 2, renal artery stenosis in 2, and Budd-Chiari syndrome in 2. CTA of low extremity artery revealed external iliac artery occlusion in 2 and femoral artery stenosis in 5. Conclusion: By combining axial images with various reconstructed with adjacent organs can also be evaluated. MSCTA is of convenience, reliability, safety and noninvasive. (authors)

  2. 多层螺旋CT肛缘定位的研究%The anal verge: localization with multi-slice spiral CT

    Institute of Scientific and Technical Information of China (English)

    汪伟; 唐光健

    2010-01-01

    Objective To determine and evaluate the method of localization of anal verge by mutislice spiral CT. To provide an imaging reference for operative guidance of low-rectal cancer. Methods Forty eight consecutive adult patients suspected of abnormalities other than rectal disease were evaluated with abdominal and pelvic CT scans since August, 2009. They were divided into two groups based on sex and age. There were 23 men and 25 women. The ages of young group were 28 to 50 years and the average age was 41 years. The ages of elderly group were 52 to 81 years and the average age was 64 years. A small cotton ball dipped with contrast media was put at the anal verge as a marker and CT scans were performed with 64-slice spiral CT scanner. The distances between the cotton balls and the lower margin of the pubis combination (La), the lower margin of the 5th sacral vertebra (Lb), the inferior aperture of minor pelvis(Lc) and the lower margin of the basement of external anal sphincter (Ld) were measured on the midsagittal images obtained by MPR. The averages, the standard deviations(s), the 95% and 80% confidence intervals of La, Lb, Lc and Ld were calculated. We took the intervals of ± 1.96 s or ± 1.28 s < 5 mm as the standard of meeting the clinical requirement. The distances meeting the clinical requirement between different sex groups or age groups were compared with t test. Results The Ld was (9.8 ± 1.2) mm, ofwhich intervals of ± 1.96 s and ± 1.28 s were 4. 8 mm and 3.0 mm respectively, meeting the clinical need.This distance was also measured conveniently. There were no significant differences ( P > 0.05 ) between two different sex groups [ male group, ( 10.0 ± 1.2) mm], female group, (9.6 ± 1.2) mm and between two age groups [ young group, (9.6 ± 1.2) mm, elderly group, ( 9.9 ± 1.3 ) mm ]. Conclusions The lower margin of the basement of external anal sphincter was a useful anatomic lanmark for localizing the anal verge,and could be definitely identified on

  3. Experimental Study of Multi-slice Spiral CT Perfusion Imaging in VX2 Soft-tissue Tumor of Rabbits

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jingfeng; WANG Renfa; WANG Min; LI Yonggang; YANG Haitao

    2006-01-01

    An experimental animal model of malignant soft-tissue tumor was established to investigate the applied value of multi-slice spiral CT perfusion imaging preliminarily. Ten New Zealand white rabbits which were implanted with VX2 tumor in either proximal thigh were subjected to CT plain scan and perfusion scan two weeks later respectively, then the original perfusion images were transmitted to AW4.0 Workstation. The functional maps and perfusion parameters including blood flow (BF), blood volume (BV), mean transit time (MTT) and permeability surface (PS) were computed and analyzed. All the values of BF, BV and PS in VX2 soft-tissue tumors were obviously higher while the MTT-values were lower than those in the normal muscular tissues significantly. It was suggested that multi-slice spiral CT perfusion imaging is an accurate, convenient and relatively safe functional imaging technique, and can give a quantitative assessment to angiogenesis and blood perfusion of soft-tissue tumors.

  4. Image Quality of 3rd Generation Spiral Cranial Dual-Source CT in Combination with an Advanced Model Iterative Reconstruction Technique: A Prospective Intra-Individual Comparison Study to Standard Sequential Cranial CT Using Identical Radiation Dose

    OpenAIRE

    Wenz, Holger; Máté E Maros; Meyer, Mathias; Förster, Alex; Haubenreisser, Holger; Kurth, Stefan; Schoenberg, Stefan O.; Flohr, Thomas; Leidecker, Christianne; Groden, Christoph; Scharf, Johann; HENZLER, THOMAS

    2015-01-01

    Objectives To prospectively intra-individually compare image quality of a 3rd generation Dual-Source-CT (DSCT) spiral cranial CT (cCT) to a sequential 4-slice Multi-Slice-CT (MSCT) while maintaining identical intra-individual radiation dose levels. Methods 35 patients, who had a non-contrast enhanced sequential cCT examination on a 4-slice MDCT within the past 12 months, underwent a spiral cCT scan on a 3rd generation DSCT. CTDIvol identical to initial 4-slice MDCT was applied. Data was recon...

  5. 64层螺旋CT低剂量双相扫描肺密度在COPD患者肺功能评价中的应用研究%Sixty-four slice spiral CT low-dose chest two-phase scanning for lung density measurement in assessing the pulmonary function in patients with chronic obstructive pulmonary disease

    Institute of Scientific and Technical Information of China (English)

    张利华; 王云华

    2012-01-01

    目的:探讨64层螺旋CT(spiral CT,SCT)低剂量双相扫描肺密度测定在慢性阻塞性肺部疾病(chronic obstructive pulmonary disease,COPD)患者肺功能评价中的应用价值.方法:选择经临床肺功能检查确诊的COPD患者36例(COPD组)和30例无任何心肺疾患且胸部CT检查正常的健康体检者(正常对照组).两组研究对象均采用德国Siemens SOMATOM Sensation 64层SCT机进行深吸气末、深呼气末的全肺低剂量(50 mAs)扫描.按扫描层数将全肺分为上、中、下3个肺区.利用Pulmo软件,分别测量和计算出COPD组与正常对照组深吸气末、深呼气末上、中、下肺区及全肺的各密度指标:深吸气末密度(Din)、深呼气末密度(Dex)、密度差(Dex-Din)、密度比(Dex/Din)、密度变化百分比(Din-Dex)/Din.所有COPD患者均在SCT检查前后3d内完成肺功能检测(pulmonary function tests,PFT),指标为第1秒用力肺活量的实测值与预计值的比值(FEV1%)及第1秒用力肺活量与用力肺活量的比值(FEV1/FVC).比较COPD组与正常对照组之间SCT各密度指标,利用Pearson相关分析来检验各密度指标与肺功能指标FEV1%和FEV1/FVC的相关性.结果:COPD组与正常对照组比较,Din在上、中、下及全肺区的差异有统计学意义(P<0.05);Dex,Dex-Din,Dex/Din,(Din-Dex)/Din在各肺区及全肺区的差异亦有统计学意义(P<0.01).Dex,Dex-Din,Dex/Din,(Din-Dex)/Din均分别与FEV1%,FEV1/FVC有良好的相关性(P<0.01).结论:64层SCT低剂量双相扫描能便捷、准确地获得评价COPD肺功能的密度指标,与FEV1%和FEV1/FVC两项肺功能指标相关性良好,可用于评估COPD患者的肺功能状况,有较高的临床应用价值.%Objective: To explore the value of 64 slice spiral CT (SCT) low-dose chest scanning at full inspiration and full expiration for lung density measurement in assessing the pulmonary function in patients with chronic obstructive pulmonary disease (COPD). Methods

  6. Role of curved planar reformations using multidetector spiral CT in diagnosis of pancreatic and peripancreatic diseases

    Institute of Scientific and Technical Information of China (English)

    Jing-Shan Gong; Jian-Min Xu

    2004-01-01

    AIM: To investigate the role of curved planar reformations using multidetector spiral CT (MSCT) in diagnosis of pancreatic and peripancreatic diseases.METHODS: From October 2001 to September 2003, 47consecutive patients with pancreatic or peripancreatic diseases, which were confirmed by operation, endoscopic retrograde cholangiopancreatography and clinical follow-up,were enrolled in this study. CT scanning was performed at a MSCT with four rows of detector. A set of images with an effective thickness of 1.0-2.0 mm and a gap of 0.5-1.0 mm(50% overlap) were acquired in all patients for postprocessing. Curved planar reformations were carried out by drawing a curved line on transverse source images, coronal or sagittal multiplanar reformations according to certain anatomic structures (such as cholangiopancreatic ducts or peripancreatic vessels) and the position of lesion.RESULTS: With thin collimation, MSCT could acquire highquality curved planar reformations to display the profile of the whole pancreas, to trace the cholangiopancreatic ducts and peripancreatic vessels, and to show the relationship of lesions with pancreas and peripancreatic anatomic structures in one curved plane, which facilitates diagnosis and rapid communication of diagnostic information with referring physicians.CONCLUSION: MSCT with thin collimation could be used to create high-quality curved planar reformations in evaluating pancreatic and peripancreatic diseases with pertinent anatomic information and relative pathologic signs to facilitate the diagnosis and enhance communication with the referring physician. Curved planar reformations can serve as supplements for transverse images in diagnosis and management of pancreatic and peripancreatic diseases.

  7. Unenhanced spiral CT in acute ureteral colic: a replacement for excretory urography?

    International Nuclear Information System (INIS)

    To compare the usefulness of unenhanced spiral CT (UCT) with that of excretory urography (EU) in patients with acute flank pain. Thirty patients presenting with acute flank pain underwent both UCT and EU. Both techniques were used to determine the presence, size, and location of urinary stone, and the presence or absence of secondary signs was also evaluated. The existence of ureteral stone was confirmed by its removal or spontaneous passage during follow-up. The absence of a stone was determined on the basis of the clinical and radiological evidence. Twenty-one of the 30 patients had one or more ureteral stones and nine had no stone. CT depicted 22 of 23 calculi in the 21 patients with a stone, and no calculus in all nine without a stone. The sensitivity and specificity of UCT were 96% and 100%, respectively. EU disclosed 14 calculi in the 21 patients with a stone and no calculus in eight of the nine without a stone. UCT and EU demonstrated secondary signs of ureterolithiasis in 15 and 17 patients, respectively. For the evaluation of patients with acute flank pain, UCT is an excellent modality with high sensitivity and specificity. In near future it may replace EU

  8. Measurement and analysis of cardiopulmonary vascular in Lanzhou healthy adults with multislice spiral CT

    International Nuclear Information System (INIS)

    Objective: To constitute a normal standard of cardiopulmonary vascular diameter and size of normal adult in Lanzhou, and to compared with the other's data reported in the previous bibliography by measuring diameter and area of cardiopulmonary artery lumen of the healthy adults in Lanzhou with multislice spiral CT (MSCT). Methods: Three hundred Lanzhou adults with no cardiopulmonary disease were equally assigned to 3 groups according to their age (A group: 18-39 years, B group: 40-60 years, C group: 61-80 years; 50 females and 50 males in each group). CT data were acquired at the end of deep inspiration phase and measurements were done on 3D reconstruction image with precise landmarks. All the results were statistically analyzed. Results: The diameters and areas of the main pulmonary artery left pulmonary artery right pulmonary artery ascending aorta and descending aorta differed significantly among the 3 groups (P<0.05). In groups B and C, there were significant differences in diameters and areas of pulmonary artery left pulmonary artery and right pulmonary between different genders (P<0.05). Conclusion: Imaging standard is provided for Lanzhou adult in early diagnosis of cardiopulmonary disease. The diameters and areas of main pulmonary artery left pulmonary artery and right pulmonary artery of Lanzhou healthy adults are different from that of other regions. It may be related to the geographical environment and the state of air pollution in Lanzhou. (authors)

  9. The role of 64-slice multi-detector computed tomography in the detection of subclinical atherosclerosis of the coronary artery.

    Science.gov (United States)

    Jeong, Hae Chang; Ahn, Youngkeun; Ko, Jum Suk; Lee, Min Goo; Sim, Doo Sun; Park, Keun Ho; Yoon, Nam Sik; Youn, Hyun Ju; Hong, Young Joon; Kim, Kye Hun; Park, Hyung Wook; Kim, Ju Han; Kim, Yun-Hyeon; Jeong, Myung Ho; Cho, Jeong Gwan; Park, Jong Chun; Kang, Jung Chaee

    2010-12-01

    Multi-detector computed tomography (MDCT) has been used for detecting or excluding coronary atherosclerotic stenosis in symptomatic patients. However, the role of MDCT for routine medical examination in asymptomatic, high-risk patients has not been established. We therefore conducted the present study to test the hypothesis that MDCT could be a valuable method for detecting subclinical coronary artery stenosis in asymptomatic patients. An observational, retrospective, single-centre study was conducted with a cohort of 1,529 patients (mean age, 56.4 ± 8.3 years; 1,353 males) who had undergone MDCT as part of their general medical checkups from November 2005 to April 2008. The patients who had a past history of coronary artery disease, typical chest pain, or evidence of myocardial ischemia were excluded. During clinical follow up of these patients, the incidence of subclinical coronary stenosis and the usefulness of MDCT for routine medical examination in asymptomatic patients were investigated. Of the 1,529 enrolled patients, 42.3% had hypertension, 13.5% had diabetes mellitus, 7.7% had hyperlipidemia, and 40.4% were current smokers. Abnormal MDCT findings were noted in 560 (36.6%) patients, who were classified into two groups. One group had the presence coronary calcium with a luminal diameter stenosis of the coronary artery of bridge, and 23 patients (1.5%) presented with significant stenosis. The patients with significant stenosis underwent percutaneous coronary intervention (PCI) with stent implantation. Major adverse cardiac events occurred in only 2 patients who had been treated with PCI during a mean follow-up period of 387 ± 253 days. The incidence of significant subclinical coronary stenosis as detected by MDCT in a general medical check-up was 3.4%, and the false-positive rate of MDCT for detecting significant coronary artery stenosis was 55.8% (29/52). 64-Slice MDCT can be a useful tool for noninvasive evaluation of coronary arteries in

  10. 螺旋CT对胃癌的诊断价值%The diagnostic value of spiral CT in gastric cancer

    Institute of Scientific and Technical Information of China (English)

    徐江; 刘珍友

    2015-01-01

    目的:分析胃癌的螺旋CT表现,并评价螺旋CT对胃癌的诊断能力。方法收集19例经胃镜活检或手术病理证实的胃癌病例,分析其螺旋CT表现。结果螺旋CT能清楚地观察胃癌病变的全貌、病变与周围脏器的关系,但对胃癌的定性方面有一定的局限性。结论螺旋 CT检查可首先发现胃部病变,如结合钡餐、纤维胃镜,能为临床治疗提供可靠的价值。%Objective To analyze the CT findings of stomach cancer and to evaluate its diagnostic ability. Methods Collection of 19 cases by endoscopic biopsy or surgical pathology confirmed cases of gastric cancer. The spiral CT features of stomach cancer were analyzed retrospectively. Results Although the limitation in the diagnosis of GASTRIC cancer, spiral CT shows a clearly revealed outline of gastric cancer lesions and the relationship between the lesions and surrounding organs. Conclusion Spiral CT examination may first discovered gastric cancer and can provide reliable basis for clinical treatment by combining barium meal and fiberoptic endoscope.

  11. 3D imaging with an isocentric mobile C-arm. Comparison of image quality with spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Kotsianos, Dorothea; Wirth, Stefan; Fischer, Tanja; Euler, Ekkehard; Rock, Clemens; Linsenmaier, Ulrich; Pfeifer, Klaus Juergen; Reiser, Maximilian [Departments of Radiology and Surgery, Klinikum der Universitaet Muenchen, Innenstadt, Nussbaumstrasse 20, 80336, Munchen (Germany)

    2004-09-01

    The purpose of this study was to evaluate the image quality of the new 3D imaging system (ISO-C-3D) for osteosyntheses of tibial condylar fractures in comparison with spiral CT (CT). Sixteen human cadaveric knees were examined with a C-arm 3D imaging system and spiral computed tomography. Various screws and plates of steel and titanium were used for osteosynthesis in these specimens. Image quality and clinical value of multiplanar (MP) reformatting of both methods were analyzed. In addition, five patients with tibial condylar fractures were examined for diagnosis and intra-operative control. The image quality of the C-arm 3D imaging system in the cadaveric study was rated as significantly worse than that of spiral CT with and without prostheses. After implantation of prostheses an increased incidence of artifacts was observed, but the diagnostic accuracy was not affected. Titanium implants caused the smallest number of artifacts. The image quality of ISO-C is inferior to CT, and metal artifacts were more prominent, but the clinical value was equal. ISO-C-3D can be useful in planning operative reconstructions and can verify the reconstruction of articular surfaces and the position of implants with diagnostic image quality. (orig.)

  12. The usefulness of three-dimensional imaging with spiral CT in the evaluation of upper airway stenosis

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    Jang, Won Ho; Yoon, Dae Young; Bae, Sang Hoon; Rho, Young Soo; Jung, Yin Gyo [Hallym Univ. College of Medicine, Seoul (Korea, Republic of)

    1996-01-01

    To assess the usefulness of three-dimensional (3D) spiral CT imaging in patients with upper airway stenosis. We performed 3D spiral CT imagings in ten patients in whom upper airway stenosis was clinically suspected. Eight of these patients had upper airway stenosis caused by intubation or tracheostomy (n-6), tuberculosis (n=1), or extrinsic compression by a thyroid mass (n=1). Spiral CT scanning (30-second continuous exposure and 90-mm length) was performed with a table speed of 3mm/sec and a section thickness of 3mm. The selected starting point was the epiglottis. The resulting data were reformatted by multiplanar reformation (MPR) and shaded surface display (SSD) with peeling after reconstruction of 2mm interval. In the evaluation of location and extent of stenosis, we compared fidings of 3D imaging with those of baseline axial images (n=10), endoscopy (n=9) and operation (n=4). The locations of stenosis in eight patients were as follows;tracheostoma (n=4), subglottic region (n=3), and larynx (n=1). In all eight, 3D imaging demonstrated the location and extent of stenosis, which exactly correlated with endoscopic and operative findings. In one patient, however, another stenotic area in the tracheal bifurcation was not discovered because this lesion was not included in the field of CT scan. In two patients, the diagnosis on 3D images of no 'stenosis' was comfirmed by clinical findings or operation. No differences in diagnostic accuracy were noted between axial images, MPR, and SSD when evalvating the location and extent of stenosis; vertical extent was shown more easily by 3D imaging than by axial images, however. 3D imaging with spiral CT may be an useful adjunctive method in the evaluation of upper airway stenosis with variable causes.

  13. Quantitativa analysis by 64-slice computed tomography in diagnosis of intermediate coronary artery stenosis%64排CT冠状动脉造影定量分析在冠状动脉临界病变中的价值

    Institute of Scientific and Technical Information of China (English)

    施鸿毓; 陈晖; 仇兴标; 曲新凯; 方唯一

    2012-01-01

    目的 评价64排CT冠状动脉造影对临界病变定量分析的可行性.方法 入选2009年5月-2010年8月于上海交通大学附属胸科医院行64排CT冠状动脉造影检查提示为临界病变的91例患者,共205处病变.在2周内进行经皮冠状动脉造影及定量冠状动脉造影(QCA)分析.采用Bland-Altman分析和Pearson相关分析对比64排CT冠状动脉造影定量分析与QCA的结果.结果 64排CT冠状动脉造影检查示,病变参考直径为(3.1±0.4) mm,病变长度为(14.2±11.3)mm;狭窄程度为(57.8±0.7)%,与QCA测定的(58.2±13.9)%的差异无统计学意义(P=0.64).205个经64排CT冠状动脉造影定量分析示冠状动脉狭窄程度为40%~70%的病变中,QCA检查示27个病变(13.2%)的狭窄程度低于40%,43个病变(21.0%)高于70%,135个病变(65.9%)属于冠状动脉狭窄程度为40%~70%的临界病变.64排CT冠状动脉造影定量分析与QCA结果呈中度相关(r=0.599,P<0.001),但一致性较差(平均偏差为0.4%,95%一致性可信区间为-22.1%~22.9%).结论 64排CT冠状动脉造影对临界病变的诊断价值有限,其定量分析与QCA的一致性欠佳,目前临床实用价值有限.%Objective To evaluate the feasibility of quantitative analysis by 64-slice computed tomography (CT) in intermediate coronary artery lesions. Methods Totally 91 patients with 205 lesions were diagnosed as intermediate coronary artery stenosis by 64-slice CT from May 2009 to August 2010. Conventional percutaneous coronary angiography was performed within 2 weeks after CT scan. The results of 64-slice CT quantitative analysis and quantitive coronary angiography (OCA) were compared by Bland-Altman analysis and Pearson correlations. Results The average reference values of lesions were (3.1 ±0.4) mm in diameter and (14.2±11.3) mm in length by CT scan. Diameter stenosis was (57.8 + 0.7)% by CT quantification and (58.2 + 13.91)% by OCAi there was no significant difference

  14. The comparative study between multi-slice spiral CT angiography and color flow ultrasonography in hepatic and splenic trauma

    International Nuclear Information System (INIS)

    Objective: To investigate the clinical value of multi-slice spiral CT angiography and color flow ultra- sonography in hepatic and splenic trauma. Methods Thirty-six cases of hepatic and splenic trauma were collected, the MSCT were analyzed and compared with that of color flow ultrasonography. Results: Seventeen cases were Hepatic trauma including nine cases of hepatic contusion, six cases of sub-envelope hematoma, two cases of both sub-envelope hematoma and hepatic contusion. Nineteen cases were splenic trauma including nine cases of splenic contusion, ten cases of sub-envelope hematoma. Conclusion: Multi-slice spiral CT angiography show hepatic and splenic trauma clearer than that of color flow ultrasonography, and can provide reliable basis for clinic diagnosis and therapy. (authors)

  15. Image Quality of 3rd Generation Spiral Cranial Dual-Source CT in Combination with an Advanced Model Iterative Reconstruction Technique: A Prospective Intra-Individual Comparison Study to Standard Sequential Cranial CT Using Identical Radiation Dose.

    Directory of Open Access Journals (Sweden)

    Holger Wenz

    Full Text Available To prospectively intra-individually compare image quality of a 3rd generation Dual-Source-CT (DSCT spiral cranial CT (cCT to a sequential 4-slice Multi-Slice-CT (MSCT while maintaining identical intra-individual radiation dose levels.35 patients, who had a non-contrast enhanced sequential cCT examination on a 4-slice MDCT within the past 12 months, underwent a spiral cCT scan on a 3rd generation DSCT. CTDIvol identical to initial 4-slice MDCT was applied. Data was reconstructed using filtered backward projection (FBP and 3rd-generation iterative reconstruction (IR algorithm at 5 different IR strength levels. Two neuroradiologists independently evaluated subjective image quality using a 4-point Likert-scale and objective image quality was assessed in white matter and nucleus caudatus with signal-to-noise ratios (SNR being subsequently calculated.Subjective image quality of all spiral cCT datasets was rated significantly higher compared to the 4-slice MDCT sequential acquisitions (p<0.05. Mean SNR was significantly higher in all spiral compared to sequential cCT datasets with mean SNR improvement of 61.65% (p*Bonferroni0.05<0.0024. Subjective image quality improved with increasing IR levels.Combination of 3rd-generation DSCT spiral cCT with an advanced model IR technique significantly improves subjective and objective image quality compared to a standard sequential cCT acquisition acquired at identical dose levels.

  16. Assessment of Hemodynamics in a Rat Model of Liver Cirrhosis with Precancerous Lesions Using Multislice Spiral CT Perfusion Imaging

    Directory of Open Access Journals (Sweden)

    Guolin Ma

    2013-01-01

    Full Text Available Rationale and Objectives. To develop an optimal scanning protocol for multislice spiral CT perfusion (CTP imaging to evaluate hemodynamic changes in liver cirrhosis with diethylnitrosamine- (DEN- induced precancerous lesions. Materials and Methods. Male Wistar rats were randomly divided into the control group (n=80 and the precancerous liver cirrhosis group (n=40. The control group received saline injection and the liver cirrhosis group received 50 mg/kg DEN i.p. twice a week for 12 weeks. All animals underwent plain CT scanning, CTP, and contrast-enhanced CT scanning. Scanning parameters were optimized by adjusting the diatrizoate concentration, the flow rate, and the delivery time. The hemodynamics of both groups was further compared using optimized multislice spiral CTP imaging. Results. High-quality CTP images were obtained with following parameters: 150 kV; 150 mAs; 5 mm thickness, 5 mm interval; pitch, 1; matrix, 512×512; and FOV, 9.6 cm. Compared to the control group, the liver cirrhosis group had a significantly increased value of the hepatic arterial fraction and the hepatic artery perfusion (P<0.05 but significantly decreased hepatic portal perfusion and mean transit time (P<0.05. Conclusion. Multislice spiral CTP imaging can be used to evaluate the hemodynamic changes in the rat model of liver cirrhosis with precancerous lesions.

  17. Multidetector-row spiral CT for detection of coronary artery stenosis

    International Nuclear Information System (INIS)

    Objective: To evaluate the feasibility and accuracy of multidetector-row spiral CT (MDCT) in the detection of coronary artery stenosis. Methods: Sixty-five consecutive patients with suspected coronary artery disease (CAD) underwent the retrospectively ECG-gated MDCT angiography for visualization of coronary artery lumen changes, and 32 of them were also investigated with selective coronary angiography (SCA). The images quality of MDCTA was analyzed. Presence and percentage of stenosis in coronary artery segments were determined. Results of determination of >50% stenosis of the vessel diameter with MDCTA were compared to the findings of SCA. Results: With MDCT angiography significant better image quality was achieved in patients with a heart rate below 70 beats per minute (W = 539, P50% stenosis with MDCTA were 95%, 80%, 89% and 90%, respectively. Conclusion: Even if its effective exposure time of 250 ms is limited by faster heart rates, MDCT is capable of achieving high image quality and high accuracy for detection of coronary artery stenosis

  18. Enhanced spiral CT scan Nursing%螺旋CT增强扫描的护理体会

    Institute of Scientific and Technical Information of China (English)

    杨柳

    2014-01-01

    目的:探讨行螺旋CT增强扫描患者的护理体会。方法选取我院CT室在2012年1月至2013年12月收治的行螺旋CT增强扫描的患者40例,对所有患者均加强扫描前、中、后的护理。结果本组40例患者均顺利完成CT增强扫描,轻度过敏反应3例,中度过敏反应1例,无重度过敏反应,且所有患者均获得较好质量的影像图像。结论加强对行螺旋CT增强扫描患者的护理,尤其是对造影剂应用方面的护理,可更好提高扫描效果,减少不良反应。%Objective To investigate enhanced spiral CT scan of the patient care experience .Methods CT room in our hospital from January 2012 to December 2013 admitted row spiral CT scans of 40 patients,all patients were strengthened before scanning,during and after care.Results 40 patients were successfully enhanced CT scan,mild allergic reactions three cases,one case of moderate allergic reactions,no severe allergic reactions,and all patients get better quality video images.Conclusion Strengthening row spiral CT scan of the patient care,especially inIs the application of contrast agent care,can better improve the scan results,reduce adverse reactions.

  19. Noninvasive Detection of Coronary Artery Stenosis Using 16-slice Spiral CT: a Comparison with Selective X-ray Coronary Angiography

    Institute of Scientific and Technical Information of China (English)

    SHI Heshui; HAN Ping; KONG Xiangquan; FENG Gansheng; Martin HK Hoffmann

    2006-01-01

    The role of 16-slice spiral CT was evaluated in the diagnosis of coronary stenosis, with selective X-ray coronary angiography (SCA) serving as the reference standard. Sixty-five patients who were suspected of having coronary heart disease, without percutaneous transluminal coronary angioplasty or coronary bypass-grafting, were investigated using 16-slice CT. Eight patients with pre-scan heart rate of more than 80 beats/min were given β-blockers. After the retrospectively ECG-gated axial imaging reconstruction, volume redering (VR), multi-planar reconstruction (MPR), curved MPR and maximum intensity projection (MIP) were used to reconstruct. Every segment of coronary artery with a diameter ≥1.5 mm was assessed, and the presence on CT with a stenosis exceeding 50% diameter reduction was compared with that on SCA. The reasons which lead to some segments unevaluable were analysed. Compared with SCA, 93% coronary segments and 94 % main branches were evaluable. Residual cardiac motion artifacts, severe calcification and poor opacification made 58%, 28% and 14% of the remaining 60 segments unevaluable respectively. Without routine administration of β-blockers, good coronary imaging quality can be acquired using 16-slice spiral CT. It is a reliable noninvasive method for detection of obstructive coronary artery disease.

  20. Spiral CT Diagnosis of Pulmonary Laceration%肺撕裂伤的螺旋CT诊断

    Institute of Scientific and Technical Information of China (English)

    王之平; 许永明

    2011-01-01

    Objective To analyze the spiral CT features of lung laceration. Methods 29 patients with lung laceration were examined by spiral CT in 1-4 hours after injury. 16 cases of them were followed-up in 1-3 days,4 days-3 weeks and 3 weeks later respectively after injury. Results There were 38 focuses among 29 cases,including solitary lesions ( n=12) and multiple lesions ( n=3) in right lung, solitary lesions (n=l0) and multiple lesions (n=l) in left lung, and multiple lesions ( n= 3) in bilateral lungs.The first cmergency CT findings included 5 types: (1) single cavities (n=3) and cavity lesions with air-fluid levels (n=l0) ; (2)multiple cavity lesions with air-fluid levels (n=7) ; (3) single or multiple air cavities in patchy hemorrhage or wet lung (n=12) ;(4) simplex pulmonary hematomas (n=3) ; (5) hematomas with bubbles inside ( n= 3). There were patchy, cloudy or halo-like ground glass opacity (GGO) around all of the focuses. CT findings in 16 cases followed-up included: (1) in 1-3 days, the air cavity appeared air-fluid levels, the fluid in the cavity lesions with air-fluid levels increased, the cope of hemorrhage diminished and there became hematomas, with definite margins, the GGO around the lesions gradually absorbed; (2)in 4 days-3 weeks, 8 lesions be came hematomas, with definife margins(8/16) , 3 cavity with air-fluid levels lesions diminished, the air-fluid levels disappeared and became thick wall cavity( 3/16) , 5 lesions didn't changed much( 5/16) , the GGO around all the focuses became diminished or disappeared; (3) 3 weeks later, the cavity and the cavity with air-fluid levels diminished or disappcared, the cavity in hemorrhage entirely disappeared, pulmonary hemotomas diminished, small hematoma absorbed, leaving stripe-like shadows, 3 pulmonary hemotomas were not absorbed after half-year repeated CT examination, which appeared as masses. Conclusion cavity lesion,cavity with airfluid levels, pulmonary hematoma and GGO around of the focuses are the

  1. Differentiation between sarcoidosis and Hodgkin’s lymphoma based on mediastinal lymph node involvement pattern: Evaluation using spiral CT scan

    International Nuclear Information System (INIS)

    The purpose of this study was to determine the specific and detailed anatomic sites and morphologic characteristics of mediastinal lymph nodes on spiral computed tomography for the purpose of differentiation between sarcoidosis and Hodgkin’s lymphoma. Anatomical distribution of mediastinal lymph nodes on spiral CT was reviewed in 39 patients with sarcoidosis and 37 patients with Hodgkin’s lymphoma using the International Association for the Study of Lung Cancer (IASLC) lymph node map. Other morphologic features such as lymph node calcification or coalescence of adjacent lymph nodes were also compared. Zone 10 was involved more often in sarcoidosis than in Hodgkin’s lymphoma. On the other hand, there was a higher tendency for presence of zone 1 and 3 as well as retrocrural and internal mammary lymphadenopathy in Hodgkin’s lymphoma than in sarcoidosis. Sarcoidosis presented with intranodal calcifications more often than Hodgkin’s lymphoma. Coalescence, pressure effect on adjacent structures and central cavitations were significantly more common in Hodgkin’s lymphoma. Findings of the present study indicate that specific anatomical distribution and morphological patterns of mediastinal lymph nodes, as demonstrated on spiral CT, can be useful in differentiating sarcoidosis from Hodgkin’s lymphoma

  2. Spiral CT arthrography of multiplanar reconstruction and virtual arthroscopy technique in diagnosis of knee with internal derangements

    Institute of Scientific and Technical Information of China (English)

    熊传芝; 郝敬明

    2004-01-01

    5Objective:To evaluate the values of spiral CT arthrography with multiplanar reconstruction and virtual arthroscopy technique in diagnosis of internal derangements of the knee. Methods:Ten bovine knees were used for experiment. The menisci, anterior and posterior cruciate ligaments and cartilage of these 10 bovine knees were injured with a hook. Each of the joints was injected with 100 mi air, then soon scanned with a PQ6000 spiral computed tomography scanner. The data obtained was input into the work station, and multiplanar reconstruction technique was used to illustrate lesions in the knees. The results of CT diagnosis were compared to those found by gross inspection of the specimens. Clinically, 10 knees of 9 patients diagnosed as internal derangement were evaluated with the same method after 50-70 ml air was injected into each of the joints. Nine months later, the data of 2 patients were used for CT endoscopy reconstruction. The results were compared with intraoperative findings. Results:Experimentally,the sensitivity and specificity were 88.9% and 93.9% by detection of meniscal abnormalities, 85.7% and 100% by detection of cruciate ligament lesions, and 72.7% and 100% by detection of cartilage damage, respectively. Clinically, the sensitivity and specificity were 90. 0% and 95.0% by detection of meulscal lesion. As to ligament, the figures were 85.7% and 100% respectively. Images of virtual arthroscopy simulated the images of real arthroscopy. Conclnsious:Spiral CT arthrography of multiplanar reconstruction technique offers fime images of internal structures of the knee, with clear border and internal structure. It is an accurate method for detecting meulscal, cruciate and collateral ligament and cartilaginous lesions that cause internal derangement of the knee.Virtual arthroscopy technique is a hopeful method for detecting reasons of derangement of the knee.

  3. Peripheral pulmonary nodules: Relationship between multi-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF expression

    Directory of Open Access Journals (Sweden)

    Cheng Xiao-Ling

    2008-06-01

    Full Text Available Abstract Background The aim of this study is to investigate the relationship between16-slice spiral CT perfusion imaging and tumor angiogenesis and VEGF (vascular endothelial growth factor expression in patients with benign and malignant pulmonary nodules, and differential diagnosis between benign and malignant pulmonary nodules. Methods Sixty-four patients with benign and malignant pulmonary nodules underwent 16-slice spiral CT perfusion imaging. The CT perfusion imaging was analyzed for TDC (time density curve, perfusion parametric maps, and the respective perfusion parameters. Immunohistochemical findings of MVD (microvessel density measurement and VEGF expression was evaluated. Results The shape of the TDC of peripheral lung cancer was similar to those of inflammatory nodule. PH (peak height, PHpm/PHa (peak height ratio of pulmonary nodule to aorta, BF (blood flow, BV (blood volume value of peripheral lung cancer and inflammatory nodule were not statistically significant (all P > 0.05. Both showed significantly higher PH, PHpm/PHa, BF, BV value than those of benign nodule (all P 0.05. In the case of adenocarcinoma, BV, BF, PS, PHpm/PHa, and MVD between poorly and well differentiation and between poorly and moderately differentiation were statistically significant (all P 0.05. PH, PHpm/PHa, BV, and PS of benign nodule were significantly lower than those of peripheral lung cancer (all P Conclusion Multi-slice spiral CT perfusion imaging closely correlated with tumor angiogenesis and reflected MVD measurement and VEGF expression. It provided not only a non-invasive method of quantitative assessment for blood flow patterns of peripheral pulmonary nodules but also an applicable diagnostic method for peripheral pulmonary nodules.

  4. Renal colic: a randomised trial of non-enhanced spiral CT compared to intravenous pyelography

    International Nuclear Information System (INIS)

    Full text: Many studies have demonstrated high accuracy of non-enhanced spiral CT (NECT) in renal colic, with sensitivities and specificities of 95-100%. There have been few studies comparing the diagnostic utility and outcomes of patients investigated with NECT and intravenous pyelography (IVP). Two hundred patients presenting to the Emergency Department of a tertiary public teaching hospital with suspected acute renal colic were randomised into undergoing NECT or IVP. Assessments were made of diagnostic utility, incidence of alternative diagnosis, requirement for further imaging, length of hospital stay, urological intervention rates, radiation dosage and costs. NECT was better than IVP in making a definitive diagnosis of ureteric calculus or of recent calculus passage (65/102, 66% versus 42/98, 41%). Calculi were missed in 2 patients in the IVP group.Two patients in each group had alternative diagnosis by initial imaging. There was no difference in the length of hospital stay or intervention rate. More plain x-rays during admission and more IVPs during follow-up were performed in the NECT group. Median effective radiation dosages were 2.97mSv (IVP) and up to 5mSv (NECT). NECT provides greater diagnostic utility in this randomised comparison, but no difference in measured outcomes. The incidence of alternative diagnoses was low, probably due to patient selection. Financial costs for each modality are comparable in a public tertiary hospital. Radiation dosages are higher for NECT and, for this reason it may be appropriate to consider limiting NECT use to patients who do not have classical symptoms of renal colic, to older patients and those with a contraindication to the administration of intravenous contrast media. Copyright (2002) Blackwell Science Pty Ltd

  5. The value of multi-slice spiral CT in the preoperative assessment of living renal donor

    International Nuclear Information System (INIS)

    Objective: The purpose of this study is to assess the value of multi-slice spiral CT (MSCT) in the preoperative evaluation of living renal donor as a all in one modality. Methods: Thirty-six potential living renal donors underwent the examination using a GE light VCT scanner. Informed consent was obtained from all participants. The plain scan, early arterial phase, late arterial phase and excretory phase scans are performed in the former 25 donors (injection rate 5 rolls, total volume 100 mi, tube tension 120 kV). While in the later 11 donors (2 ml/s 40 ml +4 ml/s 60 ml), the scanning protocol included the plain scan ( 100 kV), vascular phase and excretory phase scans (100 kV). The excretory phase data were used in the reconstruction of CT urography in both groups. All images were reviewed by one radiologist and one urologist, and the findings of MSCT were compared with intraoperative findings for 33 donors, to investigate the utilities of MSCT in assessing renal vascularity, urinary tract and lesions of renal parenchyma. When discrepancies are found between the two reviewers, consensus was obtained via discussion. Au data was statiscally processed with SPSS for Windows. Results: MSCT angiography is in accordance with intraoperative findings in demonstrating the anatomy of renal arteries and renal vein trunk, accesary arteries, early branching of renal artery. The findings from CTA are highly in accordance with the intraoperative findings, which facilitate intraoperative ligation and reduce relevant complications. CTU demonstrates the anatomy of urinary, tract in good agreement with the intraoperative findings. The image quality of 3D vascularity and CTU between the two groups, scored 4.4 ± 1.2 vs 4.2 ± 1.3 and 4.6 ± 0.8 vs 4.4 ± 0.9 respectively, no statistical between-groups difference was found (Z=-0.89, -0.47, P>0.05). Conclusion: MSCT multiphase scanning combined with CTA and CTU play a important role in the evaluation of living renal donor, which

  6. Postoperative follow-up of Stanford type A aortic dissections with Spiral-CT and MRI: Normal imaging findings and typical complications; Spiral-CT und MRT der operierten Stanford Typ A-Aortendissektion: Verlauf und Komplikationen

    Energy Technology Data Exchange (ETDEWEB)

    Sommer, T.; Pauleit, D.; Hofer, U.; Preusse, K.; Layer, G.; Schild, H. [Bonn Univ. (Germany). Radiologische Klinik; Abu-Ramadan, D.; Likungu, J. [Bonn Univ. (Germany). Klinik fuer Herz- und Gefaesschirurgie

    1998-02-01

    Purpose: To demonstrate normal postoperative Spiral-CT and MRI findings and typical complications in patients with aortic repair after Stanford type A aortic dissection. Results: The following postoperative complications were seen: Three pseudoaneurysms which developed at the proximal anastomoses of the Dacron prosthesis in two cases and at the insertion site of the reimplanted left coronary artery after implantation of a composite graft (Bentall procedure) in one case; one re-dissection; one perforation of the false lumen; periprostethic flow in one patient after surgical repair of type A dissection by the graft inclusion technique; progressive dilatation of the false lumen in 4 cases; dilatation of the aortic root in a Marfan patient after replacement of the ascending aorta. Conclusion: Precise knowledge of the surgical technique performed is crucial to accurate postoperative imaging evaluation. MRI is the method of choice in the postoperative follow-up of clinically stable patients with aortic dissections. (orig./AJ) [Deutsch] Ziel: Darstellung der verschiedenen Operationsverfahren bei der Stanford Typ A-Dissektion mit ihren typischen Aspekten in Spiral-CT und MRT sowie ihren spezifischen Komplikationen. Ergebnisse: Folgende postoperative Komplikationen traten auf: Drei Pseudoaneurysmen, die zweimal von der proximalen Anastomose des Aorta-ascendens-Ersatzes sowie einmal von der Insertionsstelle der reimplantierten linken Koronararterie (Operation nach Bentall) ausgingen; eine Re-Dissektion; eine gedeckte Perforation des falschen Lumens; periprothetischer Fluss nach Anwendung der Graft-Inclusion-Technik; progrediente Dilatation des falschen Lumens in 4 Faellen; aneurysmatische Erweiterung des originaeren Aortenbulbus bei einem Marfan-Patienten nach suprakoronarem Aorta-ascendens-Ersatz. Schlussfolgerung: Bei der postoperativen Verlaufskontrolle von Patienten mit Aortendissektionen mittels Spiral-CT und MRT sind Kenntnisse der verschiedenen Operationsverfahren mit

  7. Spiral CT angiography and surgical correlations in the evaluation of intracranial aneurysms

    Energy Technology Data Exchange (ETDEWEB)

    Preda, L.; Di Maggio, E.M.; La Fianza, A.; Dore, R.; Fulle, I.; Solcia, M.; Campani, R. [Istituto di Radiologia, IRCCS Policlinico S. Matteo, p.le C. Golgi, 2, I-27 100 Pavia (Italy); Gaetani, P.; Rodriguez y Baena, R. [Neurosurgery, Istituto Clinico ``Humanitas``, I-20089 Rozzano (Midway Islands) (Italy); Cecchini, A. [Servizio di Radiodiagnostica, IRCCS Policlinico S. Matteo, p.le C. Golgi, 2, I-27 100 Pavia (Italy); Infuso, L. [Neurochirurgia, Dipartimento di Chirurgia, IRCCS Policlinico S. Matteo, p.le C. Golgi, 2, I-27 100 Pavia (Italy)

    1998-06-02

    We investigated the accuracy of spiral computed tomography angiography (CTA) in the detection and study of intracranial aneurysms by comparing CTA with selective angiograms and surgical findings. Twenty-six patients (9 men and 17 women; mean age 53.1 {+-} 1.8 years) with suspected intracranial aneurysms were submitted to CTA (1- to 2-mm slices, pitch 1:1, 24 s, RI = 1) after a conventional CT examination showing subarachnoid hemorrhage (SAH) in 19 cases and during neuroradiological investigations performed for other reasons in 7 cases. One hundred twenty to 150 ml iodate contrast agent (0.3-0.4 gI/ml) were injected intravenously at 5 ml/s rate and with 12- to 25-s delay calculated with a preliminary test bolus. Three-dimensional shaded surface display (3D SSD) and maximum intensity projection (MIP) reconstructions were obtained from axial images. Then, within 48 h, all patients were submitted to digital subtraction angiography (DSA), with separate assessment of CTA and DSA findings. Twenty-two aneurysms shown by CTA were confirmed at DSA and surgery (true positives), whereas the vascular lesion was not confirmed at DSA in 2 cases (false positives). The presence of intracranial aneurysms was excluded at both CTA and subsequent DSA in 7 cases (true negatives) and there were no false negatives; sensitivity was 100 %, specificity 77.8 %, and diagnostic accuracy 93.5 %. Computed tomography angiography aneurysm location was confirmed at surgery in all cases, with very high accuracy in assessing the presence of an aneurysm neck (100 %). Computed tomography angiography accurately depicted the aneurysm shape in 20 of 22 cases, but failed to depict its multilobed nature in 2 cases. The mean aneurysm diameter calculated at CTA was 0.99 {+-} 0.12 cm vs 1.09 {+-} 0.11 cm at surgery (p < 0.01). The present results suggest that the high sensitivity of CTA, if confirmed by further studies, might help in avoiding having to resort to arteriography after negative CTA in SAH patients

  8. Assessment of bone segmentation quality of cone-beam CT versus multislice spiral CT: a pilot study.

    NARCIS (Netherlands)

    Loubele, M.; Maes, F.; Schutyser, F.A.C.; Marchal, G.; Jacobs, R.; Suetens, P.

    2006-01-01

    OBJECTIVES: The objective of this study was to quantitatively assess the quality of jawbone models generated from cone beam computed tomography (CBCT) by comparison with similar models obtained from multislice spiral computed tomography (MSCT). MATERIAL AND METHODS: Three case studies were performed

  9. Spiral CT angiography for demonstrating cerebral aneurysms before and after treatment with titanium clips; Spiral-CT-Angiographie zur Darstellung von zerebralen Aneurysmen vor und nach Versorgung mit Titan-Clips

    Energy Technology Data Exchange (ETDEWEB)

    Becker, C.; Volkmar, C.; Weber, J.; Fink, U.; Holzknecht, N.; Reiser, M. [Institut fuer Radiologische Diagnostik, Klinikum Grosshadern, Universitaet Muenchen (Germany); Yousry, T. [Abteilung fuer Neuroradiologie, Institut fuer Radiologische Diagnostik, Klinikum Grosshadern, Universitaet Muenchen (Germany); Steiger, H.J. [Klinik fuer Neurochirurgie, Klinikum Grosshadern, Universitaet Muenchen (Germany)

    1997-11-01

    Purpose: To determine the suitability of spiral CT angiography (SCTA) in patients with intracerebral titanium aneurysm clips. Material and Method: The section parameters were optimised using a phantom. 16 patients were examined preoperatively and 18 following treatment of aneurysms with clips. Results: The resolution, sensitivity and specificity for demonstrating cerebral aneurysms measuring{>=}3 mm was 91.3% and 75% respectively. In 15 patients with intracerebral clips there were no or only minor artefacts; three examinations were of no value because of major metal artefacts. Amongst six aneurysms demonstrated angiographically, two, which measured more than 3 mm, could be shown by SCTA. Conclusion: SCTA was able to demonstrate intracerebral aneurysms measuring{>=}3 mm. Titanium clips did not usually affect image quality significantly. (orig.) [Deutsch] Ziel: Unsere Untersuchungen sollten die Eignung der Spiral-CT-Angiographie (SCTA) fuer Patienten mit intrazerebralen Titan-Aneurysma-Clips pruefen. Material und Methode: An einem Phantom wurden die Schichtparameter optimiert. 16 Patienten wurden praeopertiv und 18 nach operativer Clippung eines Aneurysmas untersucht. Ergebnisse: Die untere Nachweisgrenze, Sensitivitaet und Spezifitaet fuer den Nachweis von zerebralen Aneurysmen lag bei{>=}3 mm, 91,3% und 75%. Bei Patienten mit intrazerebralen Clips wiesen 15 Untersuchungen keine oder geringe Artefakte auf, drei Untersuchungen konnten wegen ausgepraegter Metallartefakte nicht ausgewertet werden. Von den 6 angiographisch nachweisbaren Restaneurysmen konnten zwei mittels SCTA dargestellt werden, deren Durchmesser ueber 3 mm lag. Schlussfolgerung: Mit der SCTA koennen intrazerebrale Aneurysmen und Restaneurysmen{>=}3 mm nachgewiesen werden. Titanclips beeintraechtigen dabei die Bildqualitaet meist nicht nachhaltig. (orig.)

  10. Normal kidney size and its influencing factors - a 64-slice MDCT study of 1.040 asymptomatic patients

    Directory of Open Access Journals (Sweden)

    Rehder Peter

    2009-12-01

    Full Text Available Abstract Background Normal ultrasound values for pole-to-pole kidney length (LPP are well established for children, but very little is known about normal kidney size and its influencing factors in adults. The objectives of this study were thus to establish normal CT values for kidney dimensions from a group of unselected patients, identify potential influencing factors, and to estimate their significance. Methods In multiphase thin-slice MDCTs of 2.068 kidneys in 1.040 adults, the kidney length pole to pole (LPP, parenchymal (PW and cortical width (CW, position and rotation status of the kidneys, number of renal arteries, pyelon width and possible influencing factors that can be visualized, were recorded from a volume data set. For length measurements, axes were adjusted individually in double oblique planes using a 3D-software. Analyses of distribution, T-tests, ANOVA, correlation and multivariate regression analyses were performed. Results LPP was 108.5 ± 12.2 mm for the right, and 111.3 ± 12.6 mm for the left kidney (p Conclusions Due to the complex influences on kidney size, assessment should be made individually. The most important influencing factors are BMI, height, gender, age, position of the kidneys, stenoses and number of renal arteries.

  11. Gastric wall thickening on spiral CT after subtotal gastrectomy for gastric cancer: comparision between recurrent caner and benign thickening

    Energy Technology Data Exchange (ETDEWEB)

    Park, Chang Sook; Choi, Jong Cheol; Yoon, Sung Kuk; Kim, Jae Ik; Oh, Jong Young; Kang, Myung Jin; Lee, Ki Nam; Nam, Kyuung Jin [Donga Univ. College of Medicine, Pusan (Korea, Republic of)

    2000-12-01

    To determine the features revealed by two-phase spiral CT scanning useful for differential diagnosis between recurrent cancer and benign wall thickening in patients who have undergone subtotal gastrectomy for stomach cancer. We retrospectively reviewed 25 cases in which wall thickening of more than 1cm in the remnant stomach after subtotal gastrectomy was revealed by two-phase spiral CT scanning. All cases were confirmed: 11 were recurrent cancer, and in 14, benign wall thickening was demonstrated. We analyzed the CT findings including maximal thickness of the gastric wall, patterns of wall thickening, degree of contrast enhancement seen during the arterial and portal phases, and the presence of perigastric strands. Maximal wall thickness was classified as either more or less than 15mm, and as either focal or diffuse. We also determined whether lymphadenopathy was present. Mean maximal gastric wall thickness was 18.4mm in the recurrent cancer group ({sup g}roup A{sup )} and 12.6mm in the benign group ({sup g}roup B{sup )}. The gastric wall was thicker than 15mm in 10 of 11 group A cases and in 3 of 14 in group B; wall thickening was focal (n=3) or diffuse (n=8) in group A, and focal (n=13) or diffuse (n=1) in group B, while the enhancement patterns seen during the arterial and portal phase, respectively, were high/high (n=8), low/high (n=1) and low/low (n=2) in group A, and low/low (n=7), low/high (n=4), high/low (n=1) and high/high (n=2) in group B. Perigastric strands were observed in nine cases in group A, but in none in group B, while lymphadenopathy was combined with wall thickening in seven group A cases but in none of those in group B. In patients who have undergone subtotal gastrectomy for gastric cancer, two-phase spiral CT findings including maximal thickness of the gastric wall, patterns of wall thickening, degree of contrast enhancement seen during the arterial and portal phase, the presence of perigastric strands, and lymphadenopathy are useful for

  12. Prospectively ECG-triggered high-pitch spiral acquisition for coronary CT angiography using dual source CT: technique and initial experience

    Energy Technology Data Exchange (ETDEWEB)

    Lell, Michael; Anders, Katharina [University of Erlangen, Diagnostic Radiology, Erlangen (Germany); Marwan, Mohamed; Schepis, Tiziano; Pflederer, Tobias; Kuettner, Axel; Ropers, Dieter; Daniel, Werner G.; Achenbach, Stephan [University of Erlangen, Department of Cardiology, Erlangen (Germany); Flohr, Thomas [CT Division, Siemens Healthcare, Forchheim (Germany); Eberhard-Karls-University, Institute of Diagnostic Radiology, Tuebingen (Germany); Allmendinger, Thomas; Thierfelder, Carsten [CT Division, Siemens Healthcare, Forchheim (Germany); Kalender, Willi; Ertel, Dirk [University of Erlangen, Institute of Medical Physics, Erlangen (Germany)

    2009-11-15

    We evaluated radiation exposure and image quality of a new coronary CT angiography protocol, high-pitch spiral acquisition, using dual source CT (DSCT). Coronary CTA was performed in 25 consecutive patients with a stable heart rate of 60 bpm or less after premedication, using 2 x 128 0.6-mm sections, 38.4-mm collimation width and 0.28-s rotation time. Tube settings were 100 kV/320 mAs and 120 kV/400 mAs for patients below and above 100-kg weight, respectively. Data acquisition was prospectively ECG-triggered at 60% of the R-R interval using a pitch of 3.2 (3.4 for the last 10 patients). Images were reconstructed with 75-ms temporal resolution, 0.6-mm slice thickness and 0.3-mm increment. Image quality was evaluated using a four-point scale (1 = excellent, 4 = unevaluable). Mean range of data acquisition was 113 {+-} 22 mm, mean duration was 268 {+-} 23 ms. Of 363 coronary artery segments, 327 had an image quality score of 1, and only 2 segments were rated as ''unevaluable''. Mean dose-length product (DLP) was 71 {+-} 23 mGy cm, mean effective dose was 1.0 {+-} 0.3 mSv (range 0.78-2.1 mSv). For 21 patients with a body weight below 100 kg, mean DLP was 63 {+-} 5 mGy cm (0.88 {+-} 0.07 mSv; range 0.78-0.97 mSv). Prospectively ECG-triggered high-pitch spiral CT acquisition provides high and stable image quality at very low radiation dose. (orig.)

  13. Italian multicenter, prospective study to evaluate the negative predictive value of 16- and 64-slice MDCT imaging in patients scheduled for coronary angiography (NIMISCAD-non invasive multicenter Italian study for coronary artery disease)

    Energy Technology Data Exchange (ETDEWEB)

    Marano, Riccardo [Hospital - Catholic University, Department of Bioimaging and Radiological Sciences, Institute of Radiology, Rome (Italy); Cobelli, Francesco de; Maschio, Alessandro del [Vita-Salute Univ., Milan (Italy). Scientifi Inst.; Floriani, Irene [Mario Negri Inst., Milan (Italy); Becker, Christoph [Muenchen Univ. (Germany); Herzog, Christopher [Frankfurt Univ. (Germany); Centonze, Maurizio [Chiara Hospital, Trento (Italy); Morana, Giovanni [Foncello Hospital, Trevisio (Italy); Gualdi, Gian Franco [DEA Umberto Hospital, Rome UNiv. (Italy); Ligabue, Guido [Univ. of Modena (Italy); Pontone, Gianluca [Centro Cardiologico Monzino, Milan (Italy); Catalano, Carlo [Umberto Hospital, La Sapienza Univ., Rome (Italy); Chiappino, Dante [Pasquinucci Hospital, Massa (Italy); Midiri, Massimo [DIBIMEL, Univ. of Palermo (Italy); Simonetti, Giovanni [Tor Vergata Univ., Rome (Italy); Marchisio, Filippo [Univ. of Turin (Italy); Olivetti, Lucio [Istituti Ospitalieri of Cremona (Italy); Fattori, Rossella [Orsola University Hospital, Bologna (Italy); Bonomo, Lorenzo [Gemelli Hospital, Catholic Univ., Rome (Italy)

    2009-05-15

    This was a prospective, multicenter study designed to evaluate the utility of MDCT in the diagnosis of coronary artery disease (CAD) in patients scheduled for elective coronary angiography (CA) using different MDCT systems from different manufacturers. Twenty national sites prospectively enrolled 367 patients between July 2004 and June 2006. Computed tomography (CT) was performed using a standardized/optimized scan protocol for each type of MDCT system ({>=}16 slices) and compared with quantitative CA performed within 2 weeks of MDCT. A total of 284 patients (81%) were studied by 16-slice MDCT systems, while 66 patients (19%) by 64-slice MDCT scanners. The primary analysis was on-site/off-site evaluation of the negative predictive value (NPV) on a per-patient basis. Secondary analyses included on-site evaluation on a per-artery and per-segment basis. On-site evaluation included 327 patients (CAD prevalence 58%). NPV, positive predictive value (PPV), sensitivity, specificity, and diagnostic accuracy (DA) were 0.91 (95% CI 0.85-0.95), 0.91 (95% CI 0.86-0.95), 0.94 (95% CI 0.89-0.97), 0.88 (95% CI 0.81-0.93), and 0.91 (95% CI 0.88-0.94), respectively. Off-site analysis included 295 patients (CAD prevalence 56%). NPV, PPV, sensitivity, specificity, and DA were 0.73 (95% CI 0.65-0.79), 0.93 (95% CI 0.87-0.97), 0.73 (95% CI 0.65-0.79), 0.93 (95% CI 0.87-0.97), and 0.82 (95% CI 0.77-0.86), respectively. The results of this study demonstrate the utility of MDCT in excluding significant CAD even when conducted by centers with varying degrees of expertise and using different MDCT machines. (orig.)

  14. Low-dose protocol of the spiral CT in orthodontics: comparative evaluation of entrance skin dose with traditional X-ray techniques

    OpenAIRE

    Cordasco, Giancarlo; Portelli, Marco; Militi, Angela; Nucera, Riccardo; Giudice, Antonino Lo; Gatto, Elda; Lucchese, Alessandra

    2013-01-01

    Background The aim of this study was to evaluate the amount of radiation doses absorbed by soft tissues (entrance skin dose) with a low-dose spiral computed tomography (CT) protocol compared to conventional X-ray techniques commonly used in orthodontics. Methods The amount of skin dose has been evaluated using a tissue-equivalent head-neck radiotherapy humanoid phantom with thermoluminescent dosimeters placed at the level of eye lens, parotid glands, and thyroid glands. CT images have been ta...

  15. Dynamic enhanced multi-slice spiral CT in evaluation of blood flow patterns of solitary pulmonary nodules with enhancement

    Institute of Scientific and Technical Information of China (English)

    LI Shenjiang; XIAO Xiangsheng; LIU Shiyuan; LI Huimin; LI Chengzhou; ZHANG Chenshi; TAO Zhiwei; YANG Chunshan

    2004-01-01

    Objective To investigate the methods of dynamic enhanced multi-slice spiral CT in evaluation of blood flow patterns of solitary pulmonary nodules (SPNs) with enhancement. Methods Seventy eight patients with SPNs (≤4 cm) with strong enhancement underwent dynamic multi-slice spiral CT (Marconi Mx8000) scan before and after contrast enhancement by injecting contrast material with a rate of 4 mL/s. For the 40 patients in protocol one, one scan was obtained every 2 seconds during 15-45 and 75- 105 seconds after injection, while for the 38 patients in protocol two, one scan was obtained every 2 seconds during 11-41 and 71-101 seconds. For all the patients, one scan was obtained every 30 seconds during 2 9 minutes. The section thickness was 2.5 mm for lesions ≤3 cm and 5 mm for lesions >3 cm. Standard algorithm was used in the image reconstruction. Precontrast and postcontrast attenuation on every scan was recorded. The perfusion,peak height, ratio of peak height of the SPN to that of the aorta and mean transit time were calculated. Results The peak height, perfusion, ratio of peak height of the SPN to that of the aorta and mean transit time in malignant SPNs were 34. 85 Hu±10.87 Hu, 30. 37 ml/(min· 100 g)±11. 14 ml/(min · 100 g), 13. 78%±3.96%, 14.19 s±6.19 s respectively in protocol one, while those in protocol two were 36.62 Hu±10.75 Hu,30.01 ml/(min · 100 g)±8.10 ml/(min · 100 g), 14.70 %±4.71%, 13.91 s±4.82 s respectively. No statistically significant differences were found between the peak height (t = 0. 673, P = 0. 503), perfusion (t =0.152, P=0.880), ratio of peak height of the SPN to that of the aorta (t 0.861, P 0.393) and mean transit time (t= 0. 199, P=0. 843) in malignant SPNs measured in protocol one and those measured in protocol two. All mean transit time in protocol two (36/36) were obtained, but only part of them (25/32) were ob tained in protocol one. Conclusion Dynamic enhanced multi-slice spiral CT is a non-invasive method for

  16. The role of lung ventilation/perfusion scintigraphy (V/Q) in the diagnosis of pulmonary embolism in comparison with multislice spiral CT

    International Nuclear Information System (INIS)

    Objective: To evaluate the clinical value of lung ventilation/perfusion scintigraphy (V/Q) in the diagnosi of pulmonary embolism (PE) and compare with multislice spiral CT. Methods: Fifty-three consecutive patients with suspected PE underwent V/Q in one day procedure, multislice CT were also performed in same day. Results: Out of 53 patients with suspected PE 29 were diagnosed as PE. The sensitivity, specificity and accuracy of lung scintigraphy were 100%(29/29), 100%(24/24), 100%(53/53) respectively, and those of spiral CT were 72.4% (21/29), 92.3%(24/26) and 85% (45/53) respectively. The correlation rate of two modalities was 86.3 (Kappa=0.38). In patients with PE, 85 segments were determined as 'completely occluded' in CT scan, whereas 65 segments showed radioactive defects in lung scintigraphy. In 256 segments, CT showed partial occlusion, only 206 segments showed decrease in radioracer uptake and 26 segments were subsegmental defects. Conclusion: V/Q in one day procedure is feasible and sensitive for the diagnosis of pulmonary embolism. V/Q and spiral CT are complemental. (authors)

  17. Application of Multislice Spiral CT for Guidance of Insertion of Thoracic Spine Pedicle Screws: An in vitro study

    Institute of Scientific and Technical Information of China (English)

    WANG Juan; ZHOU Yicheng; HU Ning; WANG Renfa

    2006-01-01

    To investigate the value of the guidance of three dimensional (3-D) reconstruction of multi-slice spiral CT (MSCT) for the placement of pedicle screws, the 3-D anatomical data of the thoracic pedicles were measured by MSCT in two embalmed human cadaveric thoracic pedicles spines (T1-T10) to guide the insertion of pedicle screws. After pulling the screws out, the pathways were filled with contrast media. The PW, PH, TSA and SSA of developed pathways were measured on the CT images and they were also measured on the real objects by caliper and goniometer. Analysis of variance demonstrated that the difference between the CT scans and real objects had no statistical significance (P>0.05). Moreover, the difference between pedicle axis and developed pathway also had no statistical significance (P>0.05). The data obtained from 3-D reconstruction of MSCT demonstrated that individualized standards, are not only accurate but also helpful for the successful placement ofpedicle screws.

  18. Motion estimation and compensation in dynamic spiral CT reconstruction; Estimation et compensation de mouvement en reconstruction dynamique de tomodensitometrie helicoidale

    Energy Technology Data Exchange (ETDEWEB)

    Kimdon, J.; Grangeat, P.; Koenig, A.; Bonnet, St

    2004-07-01

    Respiratory and cardiac motion causes blurring in dynamic X-ray Computed Tomography (CT). Fast scans reduce this problem, but they require a higher radiation dose per time period to maintain the signal to noise ratio of the resulting images, thereby magnifying the health risk to the patient. As an alternative to increased radiation, our team has already developed a cone-beam reconstruction algorithm based on a dynamic particle model that estimates, predicts, and compensates for respiratory motion in circular X-ray CT. The current paper presents an extension of this method to spiral CT, applicable to modern multi-slice scanners that take advantage of the speed and dose benefits of helical trajectories. We adapted all three main areas of the algorithm: backprojection, prediction, and compensation/accumulation. In backprojection, we changed the longitudinal re-binning technique, filter direction, and the method of enforcing the data sufficiency requirements. For prediction, we had to be careful of objects appearing and disappearing as the scanner bed advanced. For compensation/accumulation, we controlled the reconstruction time and combined images to cover a greater longitudinal extent for each phase in the respiratory or cardiac cycle. Tests with moving numerical phantoms demonstrate that the algorithm successfully improves the temporal resolution of the images without increasing the dose or reducing the signal-to-noise ratio. (authors)

  19. Assessment of pulmonary function using pixel indexes of multiple-slice spiral CT low-dose two-phase scanning in chronic obstructive pulmonary disease

    Institute of Scientific and Technical Information of China (English)

    张利华

    2012-01-01

    Objective To explore the values of pixel indexes (PI) with multiple-slice spiral CT low-dose two-phase scanning for assessing the pulmonary function in chronic obstructive pulmonary disease(COPD) . Methods Thirty-six patients with COPD (COPD group) and 30 healthy people(control group) underwent pulmonary

  20. Characterization of liver lesions with mangafodipir trisodium-enhanced MR imaging: multicenter study comparing MR and dual-phase spiral CT

    NARCIS (Netherlands)

    M. Oudkerk (Matthijs); C.G. Torres; B. Song; M. Konig; J. Grimm; J. Fernandez-Cuadrado; B. op de Beeck; M. Marquardt; P. van Dijk (Pieter); J.C. de Groot (Jan Cees)

    2002-01-01

    textabstractPURPOSE: To evaluate whether mangafodipir trisodium (Mn-DPDP)-enhanced magnetic resonance (MR) imaging surpasses dual-phase spiral computed tomography (CT) in differentiating focal liver lesions. MATERIALS AND METHODS: One hundred forty-five patients who had or were sus

  1. The Application Value Between Multislice Spiral CT Virtual Endoscopy and Colonoscopy Technology Application in Colon Tumors%多层螺旋CT仿真肠镜与结肠镜检查技术在发现结肠肿瘤的应用价值对比

    Institute of Scientific and Technical Information of China (English)

    李静秋; 艾松涛

    2014-01-01

    Objective To investigate the three-dimensional reconstruction and virtual endoscopy of multi-slice spiral CT in the diagnosis of colon tumor lesions and compared with colonoscopy findings. Methods From 2009 January to 2014 January in our hospital suspected colonic lesions were treated with SIEME 64 slice spiral CT in 200 cases of patients underwent volume scanning using colon, and after-treatment technology of CT workstation was used to obtain simulated colonoscopy (CTVC), multi planar reconstruction (MPR), surface shading imaging (SSD) and the transparent display (Ray sum) image, and combined with the original cross-sectional images were analyzed, and then underwent colonoscopy control. Results compared with colonoscopy, the positive rate of CTVC had higher positive rate. CTVC detected 26 cases of colonoscopy in normal patients, 12 cases were misdiagnosed as colon polyps, colorectal cancer was detected in 200 cases, the sensitivity is 100%. Conclusion multi slice spiral CT three-dimensional reconstruction and virtual endoscopy is a noninvasive imaging method, the diagnosis of space occupying lesion of the colon has its unique superiority especially colorectal cancer diagnosis sensitivity, specificity and accuracy were higher, supplementary examination can be used as fiber colonoscopy valuable, can to make up for lack of colonoscopy in the diagnosis, to bring tremendous prospects.%目的:探讨多层螺旋CT三维重建与仿真肠镜在结肠肿瘤病变诊断中的应用价值并对比结肠镜检查结果。方法对我院2009年1月至2014年1月来我院就诊的疑似结肠占位的患者应用SIEME 64层螺旋CT对200例例患者行一次屏气全结肠容积扫描,并利用工作站进行后处理以获取CT仿真肠镜(CTVC),多平面重建(MPR),表面阴影成像(SSD)和透明显示(Ray sum)图像,并结合原始横断面等图像进行分析,再行结肠镜检查对照。结果与结肠镜相比, CTVC诊断阳性率较结肠镜高,CTVC检出26例

  2. Jaws for a spiral-tooth whorl: CT images reveal novel adaptation and phylogeny in fossil Helicoprion.

    Science.gov (United States)

    Tapanila, Leif; Pruitt, Jesse; Pradel, Alan; Wilga, Cheryl D; Ramsay, Jason B; Schlader, Robert; Didier, Dominique A

    2013-04-23

    New CT scans of the spiral-tooth fossil, Helicoprion, resolve a longstanding mystery concerning the form and phylogeny of this ancient cartilaginous fish. We present the first three-dimensional images that show the tooth whorl occupying the entire mandibular arch, and which is supported along the midline of the lower jaw. Several characters of the upper jaw show that it articulated with the neurocranium in two places and that the hyomandibula was not part of the jaw suspension. These features identify Helicoprion as a member of the stem holocephalan group Euchondrocephali. Our reconstruction illustrates novel adaptations, such as lateral cartilage to buttress the tooth whorl, which accommodated the unusual trait of continuous addition and retention of teeth in a predatory chondrichthyan. Helicoprion exemplifies the climax of stem holocephalan diversification and body size in Late Palaeozoic seas, a role dominated today by sharks and rays.

  3. Evaluation of image quality and dose in thoracic spiral CT examination in patients with pulmonary carcinoma. Preliminary results

    International Nuclear Information System (INIS)

    We have applied criteria for CT quality defined in the European Guidelines to a samples of thoracic CT examinations for the indication of pulmonary carcinoma of 5 institutions of the Community of Madrid that have spiral CT equipment. The selected examinations have been evaluated independently by five radiologists to determine the degree of adherence to the quality criteria for image defined in the Guidelines s for examinations of general thorax. Dosimetric measurements carried out in parallel have served to estimate the values of CT (CTDIw) dose indices, dose-length product (DLP) and effective dose for every patient. The result show a high global adherence to the quality criteria (96%), with averages per institution being between 94% (in two institutions) and 98% (in three institutions). There are 10 of 16 criteria that are adhered to in all examinations of the sample: those which are not adhered to systematically are: two of visualization (1.1 and 1.4), with 92-96% fulfillment, and four of critical reproduction (2.6; 2.8; 2.9 and 2.10), with percentages of adherence between 91% and 96%. The average CTDIw values per institution are in the interval 12.9-19.1 mGy; those of DLP between 263 and 577 mGy cm and those of effective dose between 4.2 and 9.2 mSv. The DLP-image quality correlation in institutions with the best image quality was null in two of them and direct and moderate in the third. In both institutions with the poorest image: (Author) 20 refs

  4. Safety and efficacy of a drug regimen to control heart rate during 64-slice ECG-gated coronary CTA in children

    Energy Technology Data Exchange (ETDEWEB)

    Rigsby, Cynthia K.; Nicholas, Angela C. [Children' s Memorial Hospital, Department of Medical Imaging, 2300 Children' s Plaza, Box 9, Chicago, IL (United States); deFreitas, R.A. [Children' s Memorial Hospital, Department of Pediatrics, Chicago, IL (United States); Leidecker, Christianne [Siemens Medical Solutions, Malvern, PA (United States); Johanek, Andrew J. [Children' s Memorial Hospital, Department of Medical Imaging, 2300 Children' s Plaza, Box 9, Chicago, IL (United States); Provena St. Joseph Medical Center, Department of Radiology, Joliet, IL (United States); Anley, Peter [Children' s Memorial Hospital, Pharmacy Department, Chicago (United States); Wang, Deli [Children' s Memorial Hospital, Biostatistical Research Department, Chicago, IL (United States); Uejima, Tetsu [Children' s Memorial Hospital, Department of Anesthesiology, Chicago, IL (United States)

    2010-12-15

    The adult practice for ECG-gated single-source 64-slice coronary CTA (CCTA) includes administering beta-blockers to reduce heart rate. There are limited data on this process in children. To evaluate the safety and efficacy of a drug regimen to decrease heart rate before performing CCTA in children. IV remifentanil and esmolol infusion were chosen to decrease heart rate in 41 children (mean age 6.5 years) while they were under general anesthesia (GA) for CCTA. Drug doses, changes in heart rate and procedural complications were recorded. CCTA image quality was graded on a scale of 1 to 5. The relationships between image quality and heart rate and image quality and age were evaluated. Patient effective radiation doses were calculated. Heart rates were lowered utilizing esmolol (4 children), remifentanil (2 children) or both (35 children); 26 children received nitroglycerin for coronary vasodilation. The mean decrease in heart rate was 26%. There were no major complications. The average image-quality score was 4.4. Higher heart rates were associated with worse image quality (r = 0.67, P < 0.0001). Older age was associated with better image quality (r = 0.66, P < 0.0001). Effective radiation doses were 0.7 to 7.0 mSv. Heart rate reduction for pediatric CCTA can be safely and effectively achieved while yielding high-quality images. (orig.)

  5. CT angiography of the coronary arteries with a 16-row spiral tomograph. Effect of spatial resolution on image quality

    International Nuclear Information System (INIS)

    Purpose. To evaluate image quality of coronary CT angiography with retrospectively ECG-gated 16 multi-slice spiral CT (MSCT), reconstructed with 0.75 mm slice thickness for optimal spatial resolution and with 1.3 mm slice thickness, to produce spatial resolution comparable to a 4-MSCT.Materials and methods. Ten patients underwent coronary CT angiography with a 16-MSCT (Siemens Sensation 16, Forchheim, Germany) with 0.75 mm detector collimation. Raw helical CT data were retrospectively reconstructed using two different settings. Setting A: B20f smooth kernel, axial MPR with 1.3 mm slice thickness and 0.7 mm increment. Setting B: B35f ''HeartView'' medium-smooth kernel, 0.75 mm slice thickness, 0.5 mm increment. In the axial slices two regions of interest (ROIs) were placed in the area of the aortic root (AR) and more caudal in the area of the left ventricle (LV). Image noise was determined by the standard deviation of the CT numbers.Two readers determined visibility of coronary arteries by standardized maximum intensity projections (MIP) post-processing in left, right anterior and left anterior oblique projection plane from setting A and B. Each projection was rated on a five point rating scale concerning plaque delineation. Points determined for each data set were summed up and used for comparison.Results. No significant difference between the CT-numbers was found for setting A and B (A: 283.0 in AR/295.9 in LV and B: 282,9 in AR/297.2 in LV; p >0.2). However, the image noise was significantly different for setting A and B (A: 4.46 in AR/1.67 in LV and B: 8.16 in AR/7.38 in LV; p <0.01). Better delineation of the coronary arteries and atherosclerotic lesions could be achieved from MIP projections in setting B compared to setting A.Conclusion. Higher image noise is present in coronary 16-MSCT with thin-slice reconstruction compared to simulated 4-MSCT. However the MIP-reconstructions benefit most from the higher spatial resolution. (orig.)

  6. Detection of pulmonary metastases with pathological correlation: effect of breathing on the accuracy of spiral CT. Editor`s note

    Energy Technology Data Exchange (ETDEWEB)

    Coakley, F.V. [Abdominal Imaging Section, Department of Radiology, University of California, San Francisco, CA (United States); Cohen, M.D. [Department of Radiology, Riley Hospital for Children, Indianapolis, IN (United States); Waters, D.J. [Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN (United States); Davis, M.M. [Department of Pathology, Riley Hospital for Children, Indianapolis, IN (United States); Karmazyn, B. [Department of Radiology, Riley Hospital for Children, Indianapolis, IN (United States); Gonin, R. [Division of Biostatistics, Department of Medicine, Riley Hospital for Children, Indianapolis, IN (United States); Hanna, M.P. [Division of Biostatistics, Department of Medicine, Riley Hospital for Children, Indianapolis, IN (United States)

    1997-07-01

    Background. CT of the chest for suspected pulmonary metastases in adults is generally performed using a breath-hold technique. The results may not be applicable to young children in whom breath-holding may be impossible. Objective. Determine the effect of breathing on the accuracy of pulmonary metastasis detection by spiral CT (SCT). Materials and methods. Prior to euthanasia four anesthetized dogs with metastatic osteosarcoma underwent SCT with a collimation of 5 mm and a pitch of 2, during both induced breath-hold and normal quiet breathing. Images were reconstructed as contiguous 5-mm slices. Macroscopically evident metastases were noted at postmortem. Hard-copy SCT images were reviewed by ten radiologists, each of whom circled all suspected metastases. SCT images were compared with postmortem results to determine true and false positives. Results. The pathologist identified 132 macroscopically evident pulmonary metastases. For metastasis detection, there was no significant difference between breath-hold SCT and breathing SCT. Conclusion. In our animal model, SCT can be performed during normal resting breathing without significant loss of accuracy in the detection of pulmonary metastases. (orig.). With 3 tabs.

  7. Detection of pulmonary metastases with pathological correlation: effect of breathing on the accuracy of spiral CT. Editor's note

    International Nuclear Information System (INIS)

    Background. CT of the chest for suspected pulmonary metastases in adults is generally performed using a breath-hold technique. The results may not be applicable to young children in whom breath-holding may be impossible. Objective. Determine the effect of breathing on the accuracy of pulmonary metastasis detection by spiral CT (SCT). Materials and methods. Prior to euthanasia four anesthetized dogs with metastatic osteosarcoma underwent SCT with a collimation of 5 mm and a pitch of 2, during both induced breath-hold and normal quiet breathing. Images were reconstructed as contiguous 5-mm slices. Macroscopically evident metastases were noted at postmortem. Hard-copy SCT images were reviewed by ten radiologists, each of whom circled all suspected metastases. SCT images were compared with postmortem results to determine true and false positives. Results. The pathologist identified 132 macroscopically evident pulmonary metastases. For metastasis detection, there was no significant difference between breath-hold SCT and breathing SCT. Conclusion. In our animal model, SCT can be performed during normal resting breathing without significant loss of accuracy in the detection of pulmonary metastases. (orig.). With 3 tabs

  8. Diagnosis of pulmonary embolism and the underlying venous thrombosis by multi-slice CT; Diagnostik der Lungenembolie und zugrundeliegender Venenthrombosen in der Mehrzeilen-Spiral-CT

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, C.; Kopka, L.; Funke, M.; Funke, C.; Grabbe, E. [Abt. Roentgendiagnostik I, Georg-August-Univ. Goettingen (Germany)

    2001-06-01

    der Mehrzeilen-Spiral-CT einer simultanen Diagnostik der Lungenembolie sowie der Venenthrombose von Beinen, Becken und Abdomen. Methode: Insgesamt 70 Patienten wurden bei klinischem Verdacht auf Lungenarterienembolie in der Mehrzeilen-Spiral-CT (LightSpeed QX/I, GE, USA) untersucht. Die Kontrastierung erfolgte mit einem einmaligen intravenoesen Bolus von 150 ml eines 30%igen jodhaltigen Kontrastmittels mit einem Flow von 4 ml/s. Die Untersuchung der Pulmonalarterien wurde mit einer Einzelschichtdicke von 2,5 mm und einem Pitch von 1,5 durchgefuehrt. Anschliessend wurden die Venen der unteren Koerperhaelfte - von den proximalen Unterschenkelvenen bis zum Eintritt der V. cava inferior in den rechten Vorhof - mit einer Schichtdicke von 3,75 mm und einem Pitch von 1,5 erfasst. Das Ergebnis der Untersuchung wurde in 48 Faellen mit der Lungenszintigraphie, in 46 Faellen mit der Dopplersonographie der Venen und in 10 Faellen mit der Phlebographie verglichen. Ferner wurde die Bildqualitaet nach subjektiven Kriterien auf einer Skala von 0 bis 4 beurtellt. Ergebnis: Bei allen Patienten gelang die gleichzeitige Darstellung der Pulmonalarterien bis in den subsegmentalen Bereich sowie der Becken- und Beinvenen einschliesslich der V. cava inferior. Die Bildqualitaet erreichte den hoechsten Score bei der Bewertung dieser arteriellen bzw. venoesen Gefaessabschnitte mit Ausnahme der Unterschenkelvenen (Score 2,4). Der Vergleich mit anderen bildgebenden Verfahren dokumentierte die Ueberlegenheit der Methode in der Diagnostik von haemodynamisch wirksamen Lungenembolien und von therapeutisch relevanten Venenthrombosen mit einer signifikant genaueren Einschaetzung zentraler Lungenembolien gegenueber der Szintigraphie und der Moeglichkeit der vollstaendigeren Detektion von Cavathrombosen im Vergleich zur Phlebographie und zur Dopplersonographie. Periphere Lungenembolien koennen allerdings dem Nachweis der Methode entgehen. Hier ist die Szintigraphie vorrangig. (orig.)

  9. The diagnostic value of high resolution spiral CT in fracture of the skull base%高分辨率螺旋 CT 对颅底骨折的诊断价值

    Institute of Scientific and Technical Information of China (English)

    徐柱荣

    2014-01-01

    目的:探讨高分辨率螺旋CT扫描对颅底骨折的诊断价值。方法对57例临床疑有颅底骨折的患者先行常规CT扫描,然后行高分辨率螺旋CT扫描,并对结果进行对比分析。结果57例患者中高分辨率螺旋CT扫描检出颅底骨折45例,常规CT扫描检出10例,两者比较差异具有统计学意义( P<0.01)。结论螺旋CT高分辨率检查技术显著提高颅底骨折的检出率,对临床治疗有重要的指导意义,应作为常规检查方法。%Objective To explore the diagnosis value of high resolution spiral CT scan in fracture of the skull base .Methods Fifty-seven patients with clinically suspected skull base fracture received conventional CT scan -ning first, then received high resolution spiral CT scanning , and the result analysis were compared .Results In 57 patients, 45 cases of fracture of the skull base were detected by high resolution spiral CT scan , 10 cases were detec-ted by conventional CT scanning , showing significant difference between two methods ( P<0.01 ) .Conclusion Spi-ral CT high-resolution technique significantly increase the detection rate of the fracture of the skull base , and has im-portant guiding significance to the clinical treatment , should be used as a routine examination method .

  10. Virtual endoscopy of the upper, central and peripheral airways with multirow detector CT; Virtuelle Endoskopie der oberen, zentralen und peripheren Atemwege mit Mehrzeilen-Spiral-CT

    Energy Technology Data Exchange (ETDEWEB)

    Hoppe, H.; Dinkel, H.P.; Thoeny, H.; Vock, P. [Institut fuer Diagnostische Radiologie, Universitaetsspital Bern (Switzerland); Gugger, M. [Abteilung fuer Pneumologie, Universitaetsspital Bern (Switzerland)

    2002-09-01

    Virtual endoscopy of the upper, central and peripheral airways (virtual laryngoscopy or virtual bronchoscopy) produces endoluminal images similar to those of fiberoptic endoscopy. In particular, virtual endoscopy is useful for the assessment of endoluminal tumor extent and tracheobronchial stenosis. Especially since the introduction of multirow detector CT, high-resolution virtual-endoscopic images of the airways can be reconstructed. Either surface rendering or volume rendering can be used for realistic depiction of the airways. Semitransparent color-coded volume rendering is advantageous, because adjacent structures can be displayed in addition to endoluminal views. A major advantage of virtual endoscopy over fiberoptic endoscopy is its non-invasiveness. With virtual endoscopy, even a high-grade stenosis is passable, enabling evaluation of the distal airways. Disadvantages are its inability to depict mucosal color and to perform therapeutic maneuvers. In comparison to other CT display modes, virtual endoscopy allows a more realistic assessment of tracheobronchial stenosis than axial CT slices and multiplanar reformats. Virtual endoscopy of the airways can be used complementary to fiberoptic endoscopy before tracheotomy, stent implantation or lung resection and for post-operative follow-up. In the future, virtual airway endoscopy will be increasingly applied for interactive virtual reality guidance of airway procedures such as bronchoscopy and surgery. (orig.) [German] Die virtuelle Endoskopie der oberen, zentralen und peripheren Atemwege (virtuelle Laryngoskopie oder virtuelle Bronchoskopie) erzeugt eine der fiberoptischen Endoskopie vergleichbare Ansicht und kommt insbesondere zur Diagnostik von tracheobronchialen Stenosen und Tumoren mit endoluminaler Ausdehnung zur Anwendung. Vor allem seit Einfuehrung der Mehrzeilen-Spiral-CT lassen sich qualitativ hochwertige Rekonstruktionen der Atemwege erstellen. Das erfolgt entweder mittels Oberflaechenrekonstruktion

  11. High-resolution spiral CT of the breast at very low dose: concept and feasibility considerations

    Energy Technology Data Exchange (ETDEWEB)

    Kalender, Willi A.; Beister, Marcel; Kolditz, Daniel; Vollmar, Sabrina V.; Weigel, Michaela C.C. [University Erlangen-Nuernberg, Institute of Medical Physics, Erlangen (Germany); Boone, John M. [University of California Davis Medical Center, Department of Radiology, Sacramento, CA (United States)

    2012-01-15

    Mammography, today's standard imaging approach, has deficits with respect to the superimposition of anatomical structures. Dedicated CT of the breast so far indicated that it can provide superior soft-tissue imaging, but that it still has significant limitations with respect to spatial resolution and dose. We have assessed novel dedicated breast CT technology. Based on simulations and measurements we developed novel technology which uses direct-conversion CdTe material and photon-counting electronics with 100 {mu}m detector element size for close to 100% dose efficiency. We assessed the potential for the imaging of microcalcifications of 100 to 200 {mu}m diameter and soft-tissue lesions of 1 to 5 mm diameter by simulations at dose levels between 1 and 6 mGy. Microcalcifications of 150 {mu}m and soft-tissue lesions of 2 mm diameter were found to be clearly detectable at an average glandular dose of 3 mGy. Separate displays are required for high-resolution microcalcification and for low-resolution soft-tissue analysis. Total CT data acquisition time will be below 10 s. Dedicated breast CT may eventually provide comprehensive diagnostic assessment of microcalcifications and soft-tissue structures at dose levels equivalent to or below those of two-view screening mammography. (orig.)

  12. The clinical research of multi-slice spiral CT in intestinal imaging

    International Nuclear Information System (INIS)

    Objective: To investigate the value and usefulness of optimized multislice CT enterography (MSCTE) with orally administered isosmotic mannitol (2.5%) as negative contrast in demonstrating the small bowel and its abnormality. Methods: Forty patients suspected of intestinal tumors were randomly divided into two groups and underwent conventional or optimized MSCTE. The expansion degree of bowel lumen and the thickness of bowel wall were evaluated for the six segments of the small intestine. The other 20 patients suspected of gastrointestinal diseases underwent gastrointestinal CT imaging, The expansion degree of bowel lumen and the wall thickness of bowel wall were statistically analyzed with Chi-Square test and t test. Results: The wall thickness of the stomach, ileum and colon were (2.56± 0.52), (1.41±0.15), (1.46±0.13), (1.91±0.25), (1.97±0.26), (2.01±0.19), (2.04±0.24) and (2.05±0.18)mm. Optimized method was superior to conventional method in the expansion degree of the second and third segments of the small intestine (P0.05). The gastrointestinal CT imaging was poor in the depiction of' the duodenum and jejunum, but stomach, ileum and colon were fully illustrated. Conclusion: Optimized MSCTE was superior to conventional method in demonstrating the small bowel, and gastrointestinal CT imaging can expand diagnostic scope because of good observation of whole gastrointestinal tract. (authors)

  13. Contrast investigation of multi-slice spiral CT perfusion imaging and pathological findings in VX2 soft-tissue tumor of rabbits

    Institute of Scientific and Technical Information of China (English)

    Jingfeng Zhang; Renfa Wang; Min Wang; Jing Zhang; Jinmei Sang

    2005-01-01

    Objective: To perform a contrast investigation of multi-slice spiral CT (MSCT) perfusion imaging and pathological findings in VX2 soft-tissue tumor of rabbits, and discuss the applicative value of multi-slice spiral CT perfusion imaging in soft-tissue tumors. Methods: 8 Newzealand white rabbits were implanted with 0.1 ml VX2 tumor tissue suspension in bilateral proximal thighs. 14 days and 21 days later, CT plain scan and perfusion scan were performed on these rabbits respectively, then the images were transmitted to AW4.0 workstation, the functional maps and perfusion parameters including blood flow (BF), blood volume (BV), mean transit time(MTT) and permeability surface (PS) were computed and analyzed. Subsequently, the rabbits were sacrificed, the tumors of which were taken out for pathological examination. The correlation between MSCT functional parametric images and pathological findings was analyzed.Results: All the values of BF, BV and PS of VX2 soft-tissue tumors were obviously higher while the MTT-values were lower than those of the normal muscular tissues significantly ( P < 0.001). Conclusion: Multi-slice spiral CT perfusion imaging is an accurate, convenient and relatively safe functional imaging technique, which can give a quantitative assessment to blood perfusion and angiogenesis of soft-tissue tumors.

  14. Use of spiral CT and the contrast medium iohexol to determine in one session aortorenal morphology and the relative glomerular filtration rate of each kidney

    Energy Technology Data Exchange (ETDEWEB)

    Frennby, B.; Almen, T. [Malmoe Allmaenna Sjukhus (Sweden). Dept. of Radiology

    2001-11-01

    The aim of this study was to determine the relative glomerular filtration rate (GFR), i.e. the GFR of each kidney in percent of total GFR, by spiral CT. In 41 patients, who were part of a follow-up program after endoluminal stent grafting of aortic aneurysm, spiral CT with the contrast medium iohexol was used to evaluate the morphology of the aorta and kidneys. The opportunity was taken to utilize the already injected iohexol to determine the relative GFR with an extra CT sequence. In each patient two determinations were made, 6 or 12 months apart. The amount of a GFR marker accumulating in Bowman's space, tubuli, and renal pelvis within 2-3 min after i.v. injection, before any marker had left the kidney via the ureter, was defined as proportional to the GFR of that kidney. The renal accumulation of iohexol was obtained by spiral CT using 10-mm collimation and a table speed of 10 mm/s (pitch ratio 1:1) from the upper to the lower poles. The correlation coefficient between the relative GFR of each kidney determined at the first and second examination was excellent (r=0.99) with a median (range) difference of 1% (0-6%) of total GFR. The radiation dose calculated as the mean absorbed dose to the kidneys was 50 mGy and the effective dose 5 mSv. The morphology of aorta and kidneys and the relative GFR of each kidney can be determined in one session with spiral CT using iohexol as both angiographic contrast medium and as a GFR marker. It is also possible to take some plasma samples in the same session to determine iohexol concentration to calculate the body clearance of iohexol (or take plasma and urine samples to calculate the renal clearance of iohexol). (orig.)

  15. Comparison of Image Registration Based Measures of Regional Lung Ventilation from Dynamic Spiral CT with Xe-CT

    CERN Document Server

    Ding, Kai; Fuld, Matthew K; Du, Kaifang; Christensen, Gary E; Hoffman, Eric A; Reinhardt, Joseph M

    2012-01-01

    Purpose: Regional lung volume change as a function of lung inflation serves as an index of parenchymal and airway status as well as an index of regional ventilation and can be used to detect pathologic changes over time. In this article, we propose a new regional measure of lung mechanics --- the specific air volume change by corrected Jacobian. Methods: 4DCT and Xe-CT data sets from four adult sheep are used in this study. Nonlinear, 3D image registration is applied to register an image acquired near end inspiration to an image acquired near end expiration. Approximately 200 annotated anatomical points are used as landmarks to evaluate registration accuracy. Three different registration-based measures of regional lung mechanics are derived and compared: the specific air volume change calculated from the Jacobian (SAJ); the specific air volume change calculated by the corrected Jacobian (SACJ); and the specific air volume change by intensity change (SAI). Results: After registration, the mean registration err...

  16. Pulmonary embolism: Prospective comparison of spiral CT with ventilation - perfusion scintigraphy

    International Nuclear Information System (INIS)

    The pulmonary thromboembolism (PTE) it is an entity common with great morbidity and mortality that it requires a diagnosis soon and specify. Commonly the ventilation gammagraphy - perfusion has been the used exam of first more frequent line when one suspects the PTE but unfortunately a great quantity of reports is called of intermediate probability, for what requires complementary studies, to confirm or to discard the diagnosis. A prospective study was made with 142 patients that had suspicion of TEP in the hospital of Vancouver (Canada) and in the hospital of Calmette (France), being carried out in all gammagraphy of ventilation-perfusion and helical CT, being only taken to lung angiography to those that not had high clinical suspicion of TEP with gammagraphy or helical CT very suggestive or tuneless, undergoing the results valuation for different observers

  17. Pulmonary emphysema quantitation with Computed Tomography. Comparison between the visual score with high resolution CT, expiratory density mask with spiral CT and lung function studies; Valutazione quantitativa dell`enfisema polmonare mediante Tomografia Computerizzata. Confronto tra il punteggio visivo con alta risoluzione nell`inspirazione, maschera della densita` automatica con Tomografia Computerizzata spirale nell`espirazione ed esami funzionali respiratori

    Energy Technology Data Exchange (ETDEWEB)

    Zompatori, Maurizio; Battaglia, Milva; Rimondi, Maria Rita; Vivacqua, Donatella; Biscarini, Manuela [Policlinico S. Orsola-Malpighi, Bologna (Italy). Radiologia padiglione Pneumonefro; Fasano, Luca; Pacilli, Angela Maria Grazia; Guerrieri, Aldo; Fabbri, Mario [Policlinico S. Orsola-Malpighi, Bologna (Italy). Istituto di Fisiopatologia Respiratoria; Cavina, Mauro [Policlinico S. Orsola-Malpighi, Bologna (Italy). TSRM. Servizio di Tomografia Computerizzata

    1997-04-01

    CT is the most accurate method to detect pulmonary emphysema in vivo. They compared prospectively two different methods for emphysema quantitation in 5 normal volunteers and 20 consecutive patients with chronic obstructive pulmonary disease (COPD). All subjects were submitted to function tests and HRCT; three scans were acquired at preselected levels during inspiration. The type and extent of pulmonary emphysema were defined by two independent observers under blind conditions. Disagreements were subsequently settled by consent. All subjects were also examined with expiratory spiral CT using a density mask program, at two different cut-off levels (-850,-900 HU). Visual score and expiratory spiral density mask values (-850 HU) were significantly correlated (r = 0.86), but the visual extent of emphysema was always higher than shown by expiratory spiral CT. The emphysema extent assessed with both CT methods correlated with the function result of expiratory airflow obstruction and gas diffusion impairment (visual score versus forced expiratory volume in one second: r = -0.81, versus single breath carbon monoxide diffusion: r = -0.78. Spiral expiratory density mask -850 HU versus forced expiratory volume in one second: r = -0.85 versus single breath carbon monoxide diffusion: r = -0.77). When -900 HU was used as the cut-off value for the expiratory density mask, the correlation with single breath carbon monoxide diffusion worsened (r = -0.56). Visual score and expiratory density mask -850 HU gave similar results and permitted COPD patients to be clearly distinguished from normal controls (p < 0.01). They believe the true residual volume should lie somewhere in between the CT value and the function results with the helium dilution technique and conclude that the extent of pulmonary emphysema can be confidently assessed with CT methods. Finally, the simple visual score may be as reliable as such highly sophisticated new methods as the spiral expiratory density mask

  18. Evaluation of transplant renal artery stenosis examined by multislice spiral CT angiograph

    International Nuclear Information System (INIS)

    Objective: To evaluate the value of multislice CT angiography (MSCTA) in transplant renal artery stenosis (TRAS). Methods: Fifteen cases of TRAS underwent enhanced MSCT scanning postoperation. Multi-planar reformation (MPR), CPR (curved-planar reformation), volume rendering (VR), multi-planar volume reformation (MPVR), maximum intensity projection (MIP) and vessel probe (VP) reformation were performed to observe transplant kidney's artery. To analyse all the reconstruction technique and find the advantage and shortage of them. Results: CT findings of TRAS showed local vascular thining and enhanced renal parenchyma degradinged. CT reconstruction technique: 1 Trans-plant kidney's artery of only one case could be shown in the same MPR plane; 2 Transplant kidney's artery of 13 cases could be shown in CPR coronal and sagittal plane; 3 with 15 cases of VR, stage of courser and shape of angiostegnosis could be observed clearly through rotating the reconstruction image from different directions; 4 15 cases of MPVR could reveal transplant kidney's artery and TRAS at the same time; 5 9 cases of MIP could show TRAS in one plane; 6 15 cases of VP could show condition inside the vessel of transplant kidney, with the degree of stenosis appeared clearly. Of 15 cases of TRAS, stenosis occurred in stoma (8 cases), distant place from stoma (4 cases), stoma and distant place form stoma (2 cases), stenosis occurred in whole range (oe case). Conclusion: MSCTA has an important role as an imaging technique to evaluate TRAS of transplant kidney, which can replace DSA. It can reveal the stenosis part of vessel and direct PTA, to evaluate therapeutic effect of endovascular stent placement. MSCTA will be widespread used clinically. (authors)

  19. Non-contrast spiral CT for patients with suspected renal colic

    Energy Technology Data Exchange (ETDEWEB)

    Katz, D.S. [Department of Radiology, Stanford University Medical Center, 300 Pasteur Drive, CA 94305-5105 (United States); Lane, M.J. [Department of Radiology, Stanford University Medical Center, 300 Pasteur Drive, CA 94305-5105 (United States); Sommer, F.G. [Department of Radiology, Stanford University Medical Center, 300 Pasteur Drive, CA 94305-5105 (United States)

    1997-06-01

    Renal colic, defined as acute flank pain caused by the passage of a ureteral calculus, is a common condition, but the correct diagnosis may not be apparent clinically. For decades, intravenous urography has been the test of choice for evaluating patients with suspected renal colic. Recently, unenhanced (non-contrast) helical CT has been shown to be an accurate and highly effective examination which can be used instead of intravenous urography. In this article, the technique is reviewed in detail, including its advantages and potential pitfalls. (orig.). With 12 figs.

  20. A comparison between ventilation/perfusion scintigraphy and multislice spiral CT in the diagnosis of chronic thromboembolic pulmonary hypertension

    International Nuclear Information System (INIS)

    Objective: Chronic thromboembolic pulmonary hypertension (CTEPH) is one of the important causes of pulmonary hypertension with poor prognosis. Several imaging techniques had been used to identify CTEPH. The aim of this study was to assess the reliability of ventilation/perfusion (V/Q) scintigraphy and multislice spiral CT pulmonary angiography (CTPA) in the diagnosis of chronic thromboembolic pulmonary hypertension, and the concordance rate (or 'agreement' as in the original article) between the two techniques. Methods: Forty-nine in-patients with pulmonary hypertension without history of con- genital heart disease, valvular heart disease and acute pulmonary embolism were included in this study. All these patients underwent V/Q scintigraphy as well as CTPA for detecting CTEPH. The final diagnosis was confirmed by pulmonary angiograpy. The results of V/Q scintigraphy and CTPA were compared with the χ2 test. Results: The sensitivity, specificity and accuracy of V/Q scintigraphy in diagnosis of CTEPH was 100.0% (17/17), 71.9% (23/32) and 81.6% (40/49), respectively, and those of CTPA was 94.1% (16/17), 81.2% (26/32) and 85.7% (42/49), respectively. The concordance rate was 75.5% (37/49, Kappa=0.513), no statistically significant difference (χ2=0.75, P > 0.05 ) was found between V/Q scintigraphy and CTPA. Conclusion: Both V/Q scintigraphy and CTPA are reliable to diagnose CTEPH. (authors)

  1. Multi-detector spiral CT study of the relationships between pulmonary ground-glass nodules and blood vessels

    Energy Technology Data Exchange (ETDEWEB)

    Gao, Feng; Li, Ming; Ge, Xiaojun; Ren, Qingguo; Hua, Yanqing [Huadong Hospital Fudan University, Department of Radiology, Shanghai (China); Zheng, Xiangpeng [Huadong Hospital Fudan University, Department of Radiation Oncology, Shanghai (China); Chen, Yan [Huadong Hospital Fudan University, Department of Pathology, Shanghai (China); Lv, Fangzhen [Huadong Hospital Fudan University, Department of Thoracic Surgery, Shanghai (China)

    2013-12-15

    To investigate the relationships between pulmonary ground-glass nodules (GGN) and blood vessels and their diagnostic values in differentiating GGNs. Multi-detector spiral CT imaging of 108 GGNs was retrospectively reviewed. The spatial relationships between GGNs and supplying blood vessels were categorized into four types: I, vessels passing by GGNs; II, intact vessels passing through GGNs; III, distorted, dilated or tortuous vessels seen within GGNs; IV, more complicated vasculature other than described above. Relationship types were correlated to pathologic and/or clinical findings of GGNs. Of 108 GGNs, 10 were benign, 24 preinvasive nodules and 74 adenocarcinomas that were pathologically proven. Types I, II, III and IV vascular relationships were observed in 9, 58, 21 and 20 GGNs, respectively. Type II relationship was the dominating relationship for each GGN group, but significant differences were shown among them. Correlation analysis showed strong correlation between invasive adenocarcinoma and type III and IV relationships. Subgroup analysis indicated that type III was more commonly seen in IAC with comparison to type IV more likely seen in MIA. Different GGNs have different relationships with vessels. Understanding and recognising characteristic GGN-vessel relationships may help identify which GGNs are more likely to be malignant. (orig.)

  2. 多层螺旋CT(MSCT)灌注评估糖尿病肾病患者肾功能的临床研究%Clinical Study on Multi-slice Spiral CT (MSCT) in Evaluation of Renal Function in Patients with Diabetic Nephropathy

    Institute of Scientific and Technical Information of China (English)

    刘乃全; 孙广萍

    2016-01-01

    Objective To investigate the clinical value of multi-slice spiral CT (MSCT) perfusion in evaluation of renal function in patients with diabetic nephropathy (DN). Methods 31 cases of patients with clinically diagnosed DN and 26 normal volunteers were selected as the study subjects. All of them underwent bilateral renal perfusion scan with 64 slice spiral CT. The relationship between renal cortical perfusion parameters and clinical examination indicators in the two groups was compared. The changes in clinical examination indicators before and after perfusion scan were analyzed.Results The renal blood flow (BF), renal blood volume (BV) and renal permeability surface (PS) in DN group were significantly lower than those in control group. The mean transit time (MTT) of renal contrast agent was significantly longer than that of control group (P<0.05); BF, BV, MTT, PS and microalbumin, 24h urinary protein quantitation, creatinine and fasting blood glucose were correlated. BF and BV had no correlation (P<0.05).Conclusion MSCT renal perfusion parameters and microalbumin, 24h urinary protein quantitation and fasting blood glucose have certain correlation, which can be used for evaluation of renal function damage in patients with DN.%目的:探讨多层螺旋CT(MSCT)灌注评估糖尿病肾病(DN)患者肾功能的临床价值。方法选取31例临床确诊为DN患者及26例正常志愿者作为研究对象,均行64层螺旋CT双侧肾脏灌注扫描,对比两组肾皮质灌注参数与临床检验指标的关系,分析灌注扫描前后临床检验指标变化。结果 DN组肾血流量(BF)、肾血容量(BV)、脏表面通透性(PS)均明显低于对照组,肾造影剂的平均通过时间(MTT)明显高于对照组(P<0.05);BF、BV、MTT、PS与微量白蛋白、24h尿蛋白定量、肌酐、空腹血糖存在相关性,BF、BV与肌酐存在相关性(P<0.05)。结论 MSCT肾脏灌注指标与微量白蛋白、24h尿蛋白定量、空腹血糖具有一定相

  3. Comparing culprit lesions in ST-segment elevation and non-ST-segment elevation acute coronary syndrome with 64-slice multidetector computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Huang, W.-C. [School of Medicine, National Yang-Ming University, Taipei, Taiwan (China); Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: w.c.huang@yahoo.com.tw; Liu, C.-P. [School of Medicine, National Yang-Ming University, Taipei, Taiwan (China); Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: cpliu@isca.vghks.gov.tw; Wu, M.-T. [School of Medicine, National Yang-Ming University, Taipei, Taiwan (China); Department of Radiology, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: wu.mingting@gmail.com; Mar, G.-Y. [Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: gymar@isca.vghks.gov.tw; Lin, S.-K. [Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: skyii89@yahoo.com.tw; Hsiao, S.-H. [Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: a841120@ms3.hinet.net; Lin, S.-L. [School of Medicine, National Yang-Ming University, Taipei, Taiwan (China); Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: sllin@isca.vghks.gov.tw; Chiou, K.-R. [School of Medicine, National Yang-Ming University, Taipei, Taiwan (China); Cardiovascular Medical Center, Kaohsiung Veterans General Hospital, No. 386, Dar-Chung First Road, Kaohsiung, Taiwan (China)], E-mail: krchiou@isca.vghks.gov.tw

    2010-01-15

    Background: Classifying acute coronary syndrome (ACS) as ST elevation ACS (STE-ACS) or non-ST elevation ACS (NSTE-ACS) is critical for clinical prognosis and therapeutic decision-making. Assessing the differences in composition and configuration of culprit lesions between STE-ACS and NSTE-ACS can clarify their pathophysiologic differences. Objective: This study focused on evaluating the ability of 64-slice multidetector computed tomography (MDCT) to investigate these differences in culprit lesions in patients with STE-ACS and NSTE-ACS. Methods: Of 161 ACS cases admitted, 120 who fit study criteria underwent MDCT and conventional coronary angiography. The following MDCT data were analyzed: calcium volume, Agatston calcium scores, plaque area, plaque burden, remodeling index, and plaque density. Results: The MDCT angiography had a good correlation with conventional coronary angiography regarding the stenotic severity of culprit lesions (r = 0.86, p < 0.001). The STE-ACS culprit lesions (n = 54) had significantly higher luminal area stenosis (78.6 {+-} 21.2% vs. 66.7 {+-} 23.9%, p = 0.006), larger plaque burden (0.91 {+-} 0.10 vs. 0.84 {+-} 0.12, p = 0.007) and remodeling index (1.28 {+-} 0.34 vs. 1.16 {+-} 0.22, p = 0.021) than those with NSTE-ACS (n = 66). The percentage of expanding remodeling index (remodeling index >1.05) was significantly higher in the STE-ACS group (81.5% vs. 63.6%, p = 0.031). The patients with STE-ACS had significantly lower MDCT density of culprit lesions than patients with NSTE-ACS (25.8 {+-} 13.9 HU vs. 43.5 {+-} 19.1 HU, p < 0.001). Conclusions: Sixty-four-slice MDCT can accurately evaluate the stenotic severity and composition of culprit lesions in selected patients with either STE-ACS or NSTE-ACS. Culprit lesions in NSTE-ACS patients had significantly lower luminal area stenosis, plaque burden, remodeling index and higher MDCT density, which possibly reflect differences in the composition of vulnerable culprit plaques and thrombi.

  4. Study of adult nasal airway by multi-slice spiral CT

    International Nuclear Information System (INIS)

    Objective: To investigate the characteristics and value of nasal area-distance curves. Methods: Based on data from CT images, nasal cavity cross-sectional areas in 60 volunteers were reconstructed. The size of each nasal airway and the distance from nostril to the corresponding cross-sectional area were measured. Area-distance curves were then established according to data obtained. t test was used to analysis the data. Results: Three types of curves were found and categorized according to their shapes. Type Ⅰ consisted of 56 sides (46.7%), type Ⅱ 40 sides (33.3%), and type Ⅲ 24 sides (20.0%). For curves of nasal valve area, smooth type was seen in 86 sides (71.7%), and concave type in 34 sides (28.3%). Curves in area of inferior turbinate head were seen with shallow notch (48 sides, 40.0%), deep notch (54 sides, 45.0%), and no notch(18 sides, 15.0%). Curves in area of middle turbinate head were seen with shallow notch (31 sides, 25.8%), deep notch (38 sides, 31.7%), and no notch (51 sides, 42.5%). Nasal minimal cross-sectional area was located at nasal valve area in 76 sides (63.3%), head of inferior turbinate in 26 sides (21.7%), region anterior to nasal valve in 15 sides (12.5%), head of middle turbinate in 1 side, and region anterior to choana in 2 sides. The cross-sectional area at nasal valve m men and women were (197.9±41.2) and (151.2±35.5) mm2, respectively. The cross-sectional area at choana in men and women were (361.8±97.9) and (296.3 81.8) mm2, respectively. There was significant difference between men and women at both sites (t=4.707 and 0.007, P<0.01). The distance from nostril to nasal valve in men and women were (14.0±2.4) and (11.8±2.9) mm, which presented significant difference, too (t=3.232, P<0.01). Conclusions: CT nasal area-distance curve varied with individual, CT may provide information for evaluating nasal passage on individual basis. (authors)

  5. Multislice spiral CT of left pulmonary artery sling with tracheobronchial anomaly

    International Nuclear Information System (INIS)

    Objective: To discuss the value of MSCT in diagnosis of left pulmonary artery sling (LPAS) with tracheobronchial anomaly. Methods: MSCT was performed in 9 children with LPAS and tracheobronchial anomalies, CT findings were analyzed retrospectively. Results: According to the Wells classification of LPAS, which includes two main types and two subtypes,there were 2 patients of type 1A, 3 patients of type 1 B, 2 patients of type 2A and 2 patients of type 2B. All of children had tracheobronchial stenosis.Local tracheobronchial stenosis was found in 4 patients (all were type 1) and long tracheobronchial stenosis in 5 patients (1 patient with type 1 and 4 patients with type 2). Conclusions: MSCT is an ideal imaging modality for simultaneously identifying LPAS and associated tracheobronchial anomalies. The Wells classification is very useful for operation planning. (authors)

  6. High-resolution MRI vs multislice spiral CT: Which technique depicts the trabecular bone structure best?

    International Nuclear Information System (INIS)

    The purpose of this study was to compare trabecular bone structure parameters obtained from high-resolution magnetic resonance (HRMR) and multislice computed tomography (MSCT) images with those determined in contact radiographs from corresponding specimen sections. High-resolution MR and MSCT images were obtained in 39 distal radius specimens. For HRMR the in-plane spatial resolution was 0.152 x 0.153 mm2 with a slice thickness of 0.9 and 0.3 mm using a 3D T1-weighted spin-echo sequence. For MSCT the resolution was 0.247 x 0.247 mm2 with a collimation of 1 mm. Using a diamond saw, 117 0.9- to 1-mm-thick sections were obtained from these specimens and contact radiographs were acquired. In the corresponding sections structure parameters analogous to bone histomorphometry were determined. Significant correlations between MR- and CT-derived structure parameters and those derived from the contact radiographs were found (p<0.01); r values of up to 0.75 were obtained for HRMR imaging and up to 0.70 for MSCT. On the average, structure parameters showed higher correlations for the MR- than for the CT-derived data. For the MR data the threshold algorithm used for binarizing the images substantially affected these correlations. In conclusion, trabecular bone structure parameters assessed in distal radius HRMR and MSCT images are significantly correlated with those determined in corresponding specimen sections (p<0.01). High-resolution MR-derived structure parameters, however, performed better in the prediction of trabecular bone structure. (orig.)

  7. Effect of imaging parameters of spiral CT scanning on image quality for the dental implants. Visual evaluation using a semi-anthropomorphic mandible phantom

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate the effect of parameters of spiral CT scanning on the image quality required for the planning of dental implants operations. A semi-anthropomorphic mandible phantom which has artificial mandibular canals and teeth roots was used as a standard object for imaging. Spiral CT scans for the phantom settled in water phantom with diameters of 20 and 16 cm were performed. Visibility of the artificial mandibular canal made of a Teflon tube and gaps between tooth apex and canal in the mandibular phantom was evaluated for various combinations of the slice thickness, tables speeds, angles to the canal, and x-ray tube currents. Teeth roots were made of PVC (poly vinyl chloride). The artificial mandibular canal was clearly observed on the images of 1 mm slice thickness. At the same table speed of 2 mm /rotation, the images of thin slice (1 mm) were superior to that of thick slice (2 mm). The gap between teeth apex and canal was erroneously diagnosed on the images with table speeds of 3 mm/rotation. Horizontal scanning in parallel to the canal result in poor image quality for observation of mandibular canals because of the partial volume effect. A relatively high x-ray tube current (125 mA) at thin slice (1 mm) scanning was required for scanning the mandibular phantom in 20 cm water vessel. Spiral scanning with slice thickness of 1 mm and table speeds of 1 of 2 mm/rotation seemed to be suitable for dental implants. The result of this study suggested that diagnosis from two independent spiral scans with a different angle to the object was more accurate and more efficient than single spiral scanning. (author)

  8. The Diagnostic Value of Spiral CT Scan on Peripheral Lung Cancer%螺旋CT扫描对周围型肺癌的诊断价值

    Institute of Scientific and Technical Information of China (English)

    苏毅; 王乐乐; 倪傲

    2012-01-01

    目的 探讨螺旋CT扫描对周围型肺癌的诊断价值.方法 收集经螺旋CT扫描及病理证实的60例周围型肺癌,其中34例行增强CT扫描,对其CT影像学资料进行分析.结果 周围型肺癌的主要CT征象有:结节状、肿块状、斑片状、分叶征、毛刺征、支气管充气征或空泡征、胸膜凹陷征、血管集束征等.增强CT扫描周围型肺癌呈均匀或不均匀强化,CT值增幅约20~60 Hu,CT值增幅小于20 Hu则提示良性病变如结核球,CT值增幅大于60 Hu考虑炎性病变可能性大.结论 螺旋CT及增强CT扫描对周围型肺癌的诊断及鉴别诊断具有重要价值.%Objectives To study the diagnostic value of spiral CT scan on peripheral lung cancer. Methods 60 cases of Peripheral Lung Cancer that have been underwent Spiral CT Scan and confirmed by pathlogy were collected, and among them, 35 cases were performed with enhanced CT scan and their CT images were analyzed. Results The CT signs of Peripheral Lung Cancer are nodules, bump, patchy consolidation, the sub lobe drafts, the burr drafts the vacuole drafts, the bronchial tube gasification drafts, the pleural membrane drafts hollowly and the blood vessel gathers drafts. The results of enhanced CT scan on Peripheral Lung Cancer show homogeneous and non-homogeneous enhancement, and the increase amplitude of CT is about 20-60 Hu. When the increase amplitude is lower than 20Hu, it means benign lesions such as tuberculoma; when the increase amplitude is higher than 60Hu, it probably means inflammatory lesions. Conclusion The Spiral CT Scan and enhanced CT scan are of great significance in diagnosis and the differential-diagnosis.

  9. Otosclerosis Multilayer Spiral CT Diagnostic Value%耳硬化症的多层螺旋CT诊断价值

    Institute of Scientific and Technical Information of China (English)

    陈天忠

    2013-01-01

    Objective To summarize the analysis of otosclerosis multislice CT manifestations,combined with literature review,discussion of otosclerosis multislice CT diagnostic value.Methods Confirmed by clinic,operation for 20 cases of patients with otosclerosis,and multilayer spiral CT scan in all cases.Scanning thickness 0.625 mm,at the rate of 5.625 mm/s into the bed.Bilateral vision were small bone algorithm reconstruction,rebuilding vision is 9.6 cm,rebuild the layer thickness is 0.625 mm,reconstruction interval is 0.2 mm.Results 20 patients,a total of 38 cases of ear showed abnormal,otosclerosis multislice CT performance can be divided into window type,cochlear type and mixed type.Window type 28 ears of vestibular window side ear cystic low density area and stapes floor thick ening of vestibular window expand or narrow,the vestibular and cochlear window involved seven ears at the same time.Cochlear type 5 ears,only involving cochlear bony labyrinth surrounding bone,characterized by cochlear lost edge is not whole,density plate shaped to reduce or double loop) change.Hybrid in 5 cases,at the same time involving the cochlea,vestibule,cochlear window and other parts of the labyrinth.Conclusion Multislice CT in the diagnosis of otosclerosis is of high accuracy,is checking methods for the disease diagnosis has important value.%目的 总结分析耳硬化症的多层螺旋CT表现,并结合文献复习,探讨耳硬化症的多层螺旋CT诊断价值.方法 收集经临床、手术证实为耳硬化症的患者20例,且所有病例均行多层螺旋CT扫描.扫描层厚0.625.mm,进床速度为5.625mm/s.双侧分别小视野骨算法重建,重建视野为9.6cm,重建层厚为0.625mm,重建间隔为0.2mm.结果 20例共38例耳显示异常,耳硬化症的多层螺旋CT表现可分为窗型、耳蜗型及混合型.窗型28耳表现为前庭窗前方耳囊低密度区及镫骨底板增厚前庭窗扩大或缩小,前庭窗及蜗窗同时受累7耳.耳蜗型5耳,仅累及耳蜗周

  10. A retrospectively ECG-gated multislice spiral CT scan and reconstruction technique with suppression of heart pulsation artifacts for cardio-thoracic imaging with extended volume coverage

    International Nuclear Information System (INIS)

    A method for cardio-thoracic multislice spiral CT imaging with ECG gating for suppression of heart pulsation artifacts is introduced. The proposed technique offers extended volume coverage compared with standard ECG-gated spiral scan and reconstruction approaches for cardiac applications: Thin-slice data of the entire thorax can be acquired within one breath-hold period using a four-slice CT system. The extended volume coverage is enabled by a modified approach for ECG-gated image reconstruction. For a CT system with 0.5-s gantry rotation time, images are reconstructed with 250-ms image temporal resolution. Instead of selecting scan data acquired in exactly the same phase of the cardiac cycle for each image as in standard ECG-gated reconstruction techniques, the patient's ECG signal is used to omit scan data acquired during the systolic phase of highest cardiac motion. With this approach cardiac pulsation artifacts in CT studies of the aorta, of paracardiac lung segments, and of coronary bypass grafts can be effectively reduced. (orig.)

  11. Threshold adjusted calcium scoring using CT is less susceptible to cardiac motion and more accurate

    NARCIS (Netherlands)

    Groen, J. M.; Dijkstra, H.; Greuter, M. J. W.; Oudkerk, M.

    2009-01-01

    The purpose of this paper is to investigate calcium scoring on computed tomography (CT) using an adjusted threshold depending on the maximum Hounsfield value within the calcification (HU(peak)). The volume of 19 calcifications was retrospectively determined on 64-slice multidetector CT and dual sour

  12. The capacity of spiral CT angiography in evaluation of the central pulmonary vascular involvement from central lug cancer

    International Nuclear Information System (INIS)

    Objective: To investigate the capacity of CTA including multiplanar reconstructions (MPR) and volume rendering technique (VRT) in evaluation of the central pulmonary vascular involvement from central lung cancer (CLC), and to compare with transverse image. Methods: In a prospective series, 52 spiral CT examinations were performed on a Picker 6000 scanner for suspected CLC. Contrast medium was injected at a rate of 4 ml/s with a power injector. The scanning delay was 20 seconds. The study volume was from the arch of the aorta to the inferior pulmonary veins done in a single breath-hold, using 3 mm collimation, pitch of 1.0 and reconstructed at 1 mm intervals. 6 patients without CLC were excluded. Three radiologists compared transverse image with CTA (MPR and VR) image in a blind way, and then the findings were compared with the surgical and pathological results. Results: Reconstructed image quality was graded as excellent (50.0%) or good (41.3%), whereas motion-related artifacts led to poor image quality in 8.7% of cases. In evaluating vascular encasement of CLC, CTA was more sensitive (97.3% vs 84.0%), specific (91.1% vs 89.3%), and accurate (94.7% vs 86.3%) than transverse images. The difference in sensitivity and accuracy was statistically significant (χ2 = 7.878, P = 0.005 and χ2 = 5.532, P = 0.019, respectively). Conclusions: CTA is a more useful imaging modality before pneumonectomy, especially in pulmonary artery reconstruction and in extended resection for locally advanced lung cancer particularly when cardiopulmonary bypass is needed

  13. Investigation on the optical scan condition for imaging of multi-slice spiral CT liver perfusion in rats

    Institute of Scientific and Technical Information of China (English)

    BAI Rong-jie; WANG Jin-e; JIANG Hui-jie; HAO Xue-jia; DONG Xu-peng; HUANG Ya-hua; WEI Lai

    2013-01-01

    contrast agent was 19% or 38%,no pseudo-color map was created.The viscosity increased when the concentration of the contrast agent was 76%; so it is difficult to inject the contrast agent at such a high concentration.Also no pseudo-color map was generated when the injection time was short (1,2-3,and 4-5 seconds)or the injection rate was low (0.3 mi/s).The best perfusion images and perfusion parameters were obtained during 50 seconds scanning.Each rat was given an injection of 57% diatrizoate at 0.5 mi/s via the tail vein using a high-pressure syringe for 6 seconds.The perfusion parameters included hepatic blood flow (HBF),hepatic blood volume (HBV),mean transit time (MTT) of the contrast agent,capillary permeability-surface area product (PS),hepatic arterial index (HAI),hepatic artery perfusion (HAP),and hepatic portal perfusion (HPP).All these parameters reflected the perfusion status of liver parenchyma in normal rats,Three phases of enhancement were modified according to the time-density curves (TDCs) of the perfusion imaging:hepatic arterial phase (7 seconds),hepatic portal venous phase (15 seconds),and a delayed phase (23-31 seconds).On examination by microscopy,the liver tissues were pathologically normal.Conclusions The appropriate protocol with multi-slice spiral CT liver perfusion reflected normal liver hemodynamics in rats.This study laid a solid foundation for further investigation of the physiological characteristics of liver cancer in a rat model,and was an important supplement to and reference for conventional contrast-enhanced CT scans.

  14. The Role of Multidetector CT in the Diagnosis of Retroperitoneal Fibrosis: Report of a Case

    International Nuclear Information System (INIS)

    Herein, we report a 40-year old man who presented with flank and abdominal pain with dilatation of the bilateral pyelocalyceal system detected in ultrasonography. Computed Tomography (CT) scan showed a soft tissue mass at the level of the fourth and fifth lumbar vertebrae in the retroperitoneal region. There were no blood flow signals in 64-slice multidetector CT (MDCT) which confirms the Retroperitoneal Fibrosis (RPF). Pathological examination showed infiltration of plasma cells, macrophages, lymphocytes and eosinophils accompanied by fibrosis, which is consistent with idiopathic RPF. In conclusion, 64-slice MDCT imaging is useful in the diagnosis of RPF

  15. The clinical value of combined use of MR imaging and multi-slice spiral CT in limb salvage surgery for orthopaedic oncology patients: initial experience in nine patients

    International Nuclear Information System (INIS)

    The purpose of this prospective study was to evaluate the value of the combined use of MR imaging and multi-slice spiral CT for limb salvage surgery in orthopaedic oncology patients. Nine consecutive patients with lower/upper limb malignant bone tumours (7 osteosarcomas and 2 chondrosarcomas) were treated with limb-salvaging procedures. Preoperative planning including determination of the osteotomy plane and diameters of the prosthesis was performed basing on the preoperative CT and MR images. The histopathology was performed as golden diagnostic criteria to evaluate the accuracy of CT and MR-based determination for tumour’s boundary. The tumour extension measured on MRI was consistent with the actual extension (P>0.05, paired Student’s t test), while the extension measured on CT imaging was less than the actual extension. The length, offset and alignment of the affected limb were reconstructed accurately after the operation. An excellent functional outcome was achieved in all patients. In the present study, MRI was found to be superior to CT for determining the tumour extension, combined use of MRI and CT measurement provided high precision for the fit of the prosthesis and excellent functional results

  16. Is It Possible to Predict Heart Rate and Range during Enhanced Cardiac CT Scan from Previous Non-enhanced Cardiac CT?

    OpenAIRE

    Horiguchi, Jun; Yamamoto, Hideya; Arie, Ryuichi; Kiguchi, Masao; Fujioka, Chikako; Ohtaki, Megu; Kihara, Yasuki; Awai, Kazuo

    2010-01-01

    The effect of heart rate and variation during cardiac computed tomography (CT) on the examination quality. The purpose of this study is to investigate whether it is possible to predict heart rate and range during enhanced cardiac computed CT scan from previous non-enhanced cardiac CT scan. Electrocardiograph (ECG) files from 112 patients on three types of cardiac 64-slice CT (non-enhanced, prospective ECG-triggered and retrospective ECG-gated enhanced scans) were recorded. The mean heart rate...

  17. Comparison of application value between spiral CT and DR plain film in diagnosis of acetabulum fracture%对比螺旋 CT 与 DR 平片在髋臼骨折诊断中的应用价值

    Institute of Scientific and Technical Information of China (English)

    刘金全; 海忠; 崔凌; 郭锐

    2015-01-01

    目的:对比螺旋 CT 与 DR 平片在髋臼骨折诊断中的应用价值。方法58例髋臼骨折患者作为研究对象。所有患者均经手术证实为髋臼骨折,术前行螺旋 CT 与 DR 摄影,其中螺旋 CT 采用多平面重建(MPR)、三维表面重建(SSD)、容积重建(VR)等三维重建技术进行图像后处理,对比两种检查方案的诊断结果。结果CT 确诊髋臼骨折55例,高疑骨折3例, DR 确诊骨折42例,高疑8例,无骨折8例,两组确诊结果比较,差异有统计学意义(P<0.05);CT 诊断准确率更高。结论螺旋 CT 三维重建技术具有扫描快速、成像清晰的特点,在髋臼骨折诊断中具有重要的应用价值,较常规 DR 平片具有更高的确诊率,同时可有效评估患者骨折病情,为手术治疗方案提供指导。%Objective To compare the application value between spiral CT and DR plain film in diagnosis of acetabulum fracture. Methods There were 58 patients with acetabulum fracture as study subjects, and they were all diagnosed by operation. They received spiral CT and DR filming before operation. 3D reconstruction by multiple planar reconstruction (MPR), surface shading display (SSD), and volume reconstruction (VR) were applied for image postprocessing in spiral CT. Diagnosis results of the two examination methods were compared. Results CT showed 55 diagnosed acetabulum fracture cases and 3 highly suspected fracture cases. DR showed 42 diagnosed fracture cases, 8 highly suspected cases, and 8 cases without fracture. The difference between diagnosis results of the two groups had statistical significance (P<0.05). CT provided more accuracy in diagnosis. Conclusion Spiral CT 3D reconstruction method has advantages of quick scanning and clear imaging, and it contains important application value in diagnosis of acetabulum fracture. It provides higher diagnosis rate than common DR plain film with effective assessment of fracture condition, and it can

  18. Application of large aperture spiral CT in radiotherapy simulation positioning%大孔径螺旋CT在放疗模拟定位中的应用研究

    Institute of Scientific and Technical Information of China (English)

    李雪南; 修霞; 李高峰

    2013-01-01

    目的:探讨大孔径16排螺旋CT在放疗模拟定位中的应用。方法:应用大孔径16排螺旋CT进行乳腺癌保乳术后根治性放疗乳腺切线野的CT模拟定位,并对CT模拟定位技术与传统X射线模拟定位技术进行比较,同时与单排螺旋CT的图像进行比较。结果:大孔径16排螺旋CT在放疗模拟定位中的应用避免了因患者体位受限而造成的误差;大孔径16排螺旋CT模拟机的定位验证误差均优于传统X射线模拟机;其图像质量优于单排螺旋CT。结论:大孔径16排螺旋CT模拟定位机的应用,使得放疗定位更加精确,计划和治疗更加准确。%Objective:To discuss application of large aperture 16 row spiral CT in radiotherapy simulation positioning. Methods: To apply CT simulation positioning with large aperture 16 row spiral CT for the breast tangential field by early breast cancer after breast conserving surgery and radical radiotherapy. Compare CT-simulation and X-ray conventional positioning technique and Compare large aperture 16 row spiral CT and single row spiral CT image. Results: The application of large aperture 16 row spiral CT avoided the error because of body limited. Large aperture 16 row spiral CT simulation position validation error is superior to X-ray positioning. Its image quality is better than that of single row spiral CT. Conclusion:The application of large aperture 16 row spiral CT make simulation positioning more accurate, planned and treatment more accurate, it can provide guarantee of accurate simulation positioning for accurate plan and treatment.

  19. Spiral CT diagnosis of extrarenal pelvis (report of 47 cases)%多层螺旋CT诊断肾外肾盂(附47例报告)

    Institute of Scientific and Technical Information of China (English)

    苗新中; 段青松

    2012-01-01

    Objective To study of extrarenal pelvis CT manifestation and differential diagnosis of extrarenal pelvis, to enhance understanding, and to avoid misdiagnosis. Methods We retrospectively analysed of 47 cases of renal pelvis CT axial scan, scan and three-dimensional reconstruction performance. Results In the CT axial scan, scan and three-dimensional reconstruction in the performance of in renal sinus cystic water density, CT enhancement contrast agent uniformly filling, three-dimensional reconstruction showed a more intuitive. There were 29 cases in bilateral side, 18 cases in unilal-erne side. Conclusion Spiral CT diagnosis of extrarenal pelvis is more accurate and reliable.%目的 研究肾外肾盂的CT表现和鉴别诊断,加强对肾外肾盂的认识,避免误诊发生.方法 回顾分析47例肾外型肾盂的CT轴位平扫、增强扫描及三维重建表现.结果 在CT轴位平扫、增强扫描及三维重建中表现为在肾窦外囊样水密度影,CT增强时对比剂均匀充盈,三维重建显示更直观.其中双侧29例,单侧18例.结论 多层螺旋CT诊断肾外肾盂更为准确可靠.

  20. Prospectively Electrocardiogram-Gated High-Pitch Spiral Acquisition Mode Dual-Source CT Coronary Angiography in Patients with High Heart Rates: Comparison with Retrospective Electrocardiogram-Gated Spiral Acquisition Mode

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Kai; Ma, Rui; Wang, Li Jun [Dept. of Radiology, Baotou Central Hospital, Baotou (China); Li, Li Gang; Chen, Jiu Hong [CT BM Clinic Marketing, Siemens Healthcare, Beijing (China)

    2012-11-15

    To assess the image quality and effective radiation dose of prospectively electrocardiogram (ECG)-gated high-pitch spiral acquisition mode (flash mode) of dual-source CT (DSCT) coronary angiography (CTCA) in patients with high heart rates (HRs) as compared with retrospectively ECG-gated spiral acquisition mode. Two hundred and sixty-eight consecutive patients (132 female, mean age: 55 {+-} 11 years) with mean HR > 65 beats per minute (bpm) were prospectively included in this study. The patients were divided into two groups. Collection was performed in group A CTCA using flash mode setting at 20-30% of the R-R interval, and retrospectively ECG-gated spiral acquisition mode in group B. The image noise, contrast-to-noise ratio (CNR), image quality scores, effective radiation dose and influencing factors on image quality between the two groups were assessed. There were no significant differences in image quality scores and proportions of non-diagnostic coronary artery segments between two groups (image quality scores: 1.064 {+-} 0.306 [group A] vs. 1.084 {+-} 0.327 [group B], p = 0.063; proportion of non-diagnostic coronary artery segments: segment-based analysis 1.52% (group A) vs. 1.74% (group B), p = 0.345; patient-based analysis 7.5% (group A) vs. 6.7% (group B), p = 0.812). The estimated radiation dose was 1.0 {+-} 0.16 mSv in group A and 7.1 {+-} 1.05 mSv in group B (p = 0.001). In conclusion, in patients with HRs > 65 bpm without cardiac arrhythmia, the prospectively high-pitch spiral-acquisition mode with image-acquired timing set at 20-30% of the R-R interval provides a similar image quality and low rate of non-diagnostic coronary segments to the retrospectively ECG-gated low-pitch spiral acquisition mode, with significant reduction of radiation exposure.

  1. Comparative study of myocardial perfusion imaging and 64 multi-slice spiral CT for the diagnosis of coronary artery disease

    International Nuclear Information System (INIS)

    Objective: To compare the diagnostic value of myocardial perfusion imaging (MPI) and 64 multi-slice spiral CT (64-MSCT) for coronary artery disease (CAD). Methods: Fifty-two patients with suspected or known CAD were included in the study. Each patient underwent both stress and rest MPI, MSCT as well as conventional coronary angiography (CAG) within 1 month. The stress and rest MPI were scored by a 5-grade criteria (0-4) based on 17 coronary artery segments. The difference between summed stress and rest scores > 1 was defined as myocardial ischemia. Stenosis in one main vessel or one main branch of the main vessel ≥50% was defined as myocardial ischemia by MSCT. CAG was used as the reference for comparison. Statistical analysis was performed using SPSS 13.0 software. Kappa value was used to test the accordance of MPI and MSCT results. χ2 test was used to evaluate the difference between MPI and MSCT results. Results: The patient-based sensitivity, specificity, positive and negative predictive values and accuracy of MPI and MSCT for the diagnosis of CAD were 86.7% (26/30), 77.3% (17/22),83.9% (26/31), 81.0% (17/21), 82.7% (43/52) and 83.3% (25/30), 86.4% (19/22), 89.3%( 25/28), 79.2% (19/24), 84.6% (44/52), respectively. The vessel-based sensitivity, specificity, positive and negative predictive values and accuracy of MPI and MSCT were 74.5% (38/51), 81.0% (85/105), 65.5% (38/58), 86.7% (85/98), 78.8% (123/156) and 90.2% (46/51), 88.6% (93/105),79.3 % (46/58), 94.9% (93/98), 89.1% (139/156), respectively. There was no statistically significant difference between MPI and MSCT for either patient or lesion-based diagnosis (χ2 =0.44, 0.21, both P>0.05). 96.0% (24/25) patients with both abnormal MPI and MSCT positive were validated by CAG while 83.3% (15/18) patients with both MPI and MSCT negative were excluded by CAG. Conclusions: Both MPI and MSCT are reliable diagnostic modalities for CAD. They also provide complementary diagnostic value to each other. (authors)

  2. Value of negative spiral CT angiography in patients with suspected acute PE: analysis of PE occurrence and outcome

    Energy Technology Data Exchange (ETDEWEB)

    Krestan, C.R.; Klein, N.; Fleischmann, D.; Kaneider, A.; Kreuzer, S.; Riedl, C.; Herold, C.J. [Department of Radiology, University Hospital of Vienna-AKH, Waehringer Guertel 18-20, 1090, Vienna (Austria); Novotny, C. [Department of Nuclear Medicine, University Hospital of Vienna-AKH, Waehringer Guertel 18-20, 1090, Vienna (Austria); Minar, E. [Division of Angiology, Department of Internal Medicine, University Hospital of Vienna-AKH, Waehringer Guertel 18-20, 1090, Vienna (Austria); Janata, K. [Department of Emergency Medicine, University Hospital of Vienna-AKH, Waehringer Guertel 18-20, 1090, Vienna (Austria)

    2004-01-01

    The aim of this study was to analyze pulmonary embolism (PE) occurrence and retrospective clinical outcome in patients with clinically suspected acute PE and a negative spiral CT angiography (SCTA) of the pulmonary arteries. Within a 35-month period, 485 consecutive patients with clinical symptoms of acute PE underwent SCTA of the pulmonary arteries. Patients with a negative SCTA and without anticoagulation treatment were followed-up and formed the study group. Patient outcome and recurrence of PE was evaluated retrospectively during a period of 6 months after the initial SCTA, and included a review of computerized patient records, and interviews with physicians and patients. Patients were asked to fill out a questionnaire concerning all relevant questions about their medical history and clinical course during the follow-up period. Special attention was focused on symptoms indicating recurrent PE, as well as later confirmation and therapy of PE. Of the 485 patients, 325 patients (67%) had a negative scan, 134 (27.6%) had radiological signs of PE, and 26 (5.4%) had an indeterminant result. Of 325 patients with a negative scan, 269 (83%) were available for follow-up. The main reasons for loss to follow-up were change of address, name, or phone number, or non-resident patients who left abroad. Of 269 patients available for follow-up, 49 patients (18.2% of 269) received anticoagulant treatment because of prior or recent deep venous thrombosis (32.6%) or a history of PE (34.7%), cardiovascular disease (18.4%), high clinical probability (8.2%), positive ventilation-perfusion scan (4.2%), and elevated D-dimer test (2%). The remaining 220 patients, who did not receive anticoagulant medication, formed the study group. Of this study group, 1 patient died from myocardial infarction 6 weeks after the initial SCTA, and the postmortem examination also detected multiple peripheral emboli in both lungs (p=0.45%; 0.01-2.5, 95% confidence interval). The PE did not occur in any other

  3. To Investigate the Application of Spiral CT Three-dimensional Reconstruction of the Value of Calcaneal Fractures%跟骨骨折应用螺旋 CT 三维重建的价值探讨

    Institute of Scientific and Technical Information of China (English)

    李海源; 李小满; 高莉丽; 林秀琼; 蔡映红; 梁玉英

    2015-01-01

    Objective Analysis of spiral CT three-dimensional reconstruction imaging in the diagnosis of trauma in the clinical value of calcaneus .Methods Collection the patients with calcaneal injury to our hospital for diagnosis and treatment in November 2 0 1 2 to November 2 0 1 4 ,selection of image data w hich patients had X-ray examination and three-dimensional reconstruction of spiral CT examination ,comparison of X -ray and spiral CT 3 D reconstruction ,by using the SPSS1 9 .0 statistical software using chi square test analysis of the dif-ference between X-ray and spiral CT 3 D reconstruction in diagnosis ,classification of calcaneal fracture .Results X-ray examination and CT 3 D reconstruction for diagnosis if there is no statistical significance of calcaneal fracture(P=0 .371 >0 .05 ) ,the fracture type classification (comminuted ,intra-articular) are highly statisti-cally significant( P<0 .0 1 ) .Conclusion X-ray and spiral CT 3 D reconstruction is the basic way to check the calcaneum bone fracture ,but the spiral CT three-dimensional reconstruction can specifically form more intu-itive ,comprehensive ,clear observation of fracture ,bring convenience for Department of orthopedics diagnosis and treatment .%目的:分析螺旋CT三维重建成像技术在诊断跟骨外伤中临床价值。方法收集2012年11月至2014年11月间到我院接受诊治的跟骨外伤患者,挑选其中患者均有进行X线平片检查及螺旋CT三维重建检查的影像资料,比较X线平片检查及螺旋CT三维重建,采用SPSS 19.0统计软件应用卡方检验分析X线平片检查及螺旋CT三维重建对跟骨骨折诊断、分类的差异。结果 X线平片检查与CT三维重建对于诊断是否有跟骨骨折无统计学意义(P=0.371>0.05),对于骨折类型分类(粉碎性、关节内)有高度统计学意义( P<0.01)。结论 X线平片检查及螺旋CT三维重建都是跟骨骨折检查的基本方式,但螺旋CT三维重

  4. Pharyngolaryngeal tumors: spiral CT with 3D reconstruction; Tumeurs du pharyngo-larynx: apport de la tomodensitometrie en acquisition volumique avec reconstructions tridimensionnelles

    Energy Technology Data Exchange (ETDEWEB)

    Arnould, V.; Troufleau, P.; Stines, J. [Centre de Lutte Contre le Cancer, 54 - Nancy (France); Regent, D. [Centre Hospitalier Universitaire, 54 - Nancy (France)

    1995-04-01

    Spiral CT allows the exploration of the whole larynx and hypopharynx in 30 seconds. This is a good adjustment between the technique and the organ. Performed on 15 patients during a 30 seconds Valsalva maneuver, the exploration yields results from good to excellent. In two cases, conventional and helical CT are compared. The limitation of mA is not a drawback in such a thin region and there is no shift of organ or lesion between two scans, because the whole range is scanned in a single breathhold. 3D display of larynx and pharynx can performed with some advantage, especially easiness of presentation for surgeon. They help topographic analysis and make correlation between endoscopic views and axial scans. They could be useful for surgical simulation and 3D photon treatment plannings. (authors). 17 refs., 17 figs.

  5. Diameters and form of skull base foramen ovale measured by three-dimensional spiral CT thin-slice scan in healthy adults

    Institute of Scientific and Technical Information of China (English)

    Xiaohua Chen; Fengxian Deng; Shuhang Wei; Tingsong Fang

    2006-01-01

    BACKGROUND: The accurate measurements of various data of the bone diameters of foramen ovale of living person can change the methods of puncturing trigeminal gasserian ganglion via foramen ovale for treating trifacial neuralgia from the experience of puncture operator only to puncture by taking the objective data of measurement as the evidence, which is good for improving the accuracy of puncturing trigeminal ganglion and reducing side effects.OBJECTiVE: To observe the forms of foramen ovales in healthy adults displayed by volume rendering and multi-planar reconstruction after three-dimensional spiral CT thin-slice scan of skull base, and measure the longitudinal diameter and transverse diameter.DESTGN: A repetitive observation and measurement.SETTINGS: Department of Neurosurgery and Department of Medical Imaging, Foshan Hospital of Traditional Chinese Medicine.PARTICTPANTS: Fifty healthy adults (100 sides), who were examined with three-dimensional spiral CT scan,were randomly selected from the Department of Medical Imaging, Foshan Hospital of Traditional Chinese Medicine from January 2005 to January 2006, including 26 males and 24 females, aged 25-68 years with an average of 48 years old. They were all informed and agreed with the examination.METHODS: The subjects were examined with the Philips 16-slice spiral CT-Mx 8000 IDT CT apparatus (Philips Company, Holland), the scanning ranged from 2 cm below the canthomeatal line to the level of suprasellar cistern. The width of collimator was 0.75 mm, pitch was 0.663; tube current was 350 mA, voltage was 120 kV,resolution was 512×512 matrix; slice thickness of reconstruction was 1 mm, and interval was 0.5 mm. After the three-dimensional spiral CT thin-slice scan of skull base, the image post-processing techniques including volume rendering and multi-planar reconstruction were applied to observe the forms of foramen ovales, and measure the size, longitudinal diameter and transverse diameter of the foramen ovales. The

  6. Dual-source spiral CT with pitch up to 3.2 and 75 ms temporal resolution: Image reconstruction and assessment of image quality

    Energy Technology Data Exchange (ETDEWEB)

    Flohr, Thomas G.; Leng Shuai; Yu Lifeng; Allmendinger, Thomas; Bruder, Herbert; Petersilka, Martin; Eusemann, Christian D.; Stierstorfer, Karl; Schmidt, Bernhard; McCollough, Cynthia H. [Siemens Healthcare, Computed Tomography, 91301 Forchheim, Germany and Department of Diagnostic Radiology, Eberhard-Karls-Universitaet, 72076 Tuebingen (Germany); Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905 (United States); Siemens Healthcare, Computed Tomography, 91301 Forchheim (Germany); Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905 (United States)

    2009-12-15

    Purpose: To present the theory for image reconstruction of a high-pitch, high-temporal-resolution spiral scan mode for dual-source CT (DSCT) and evaluate its image quality and dose. Methods: With the use of two x-ray sources and two data acquisition systems, spiral CT exams having a nominal temporal resolution per image of up to one-quarter of the gantry rotation time can be acquired using pitch values up to 3.2. The scan field of view (SFOV) for this mode, however, is limited to the SFOV of the second detector as a maximum, depending on the pitch. Spatial and low contrast resolution, image uniformity and noise, CT number accuracy and linearity, and radiation dose were assessed using the ACR CT accreditation phantom, a 30 cm diameter cylindrical water phantom or a 32 cm diameter cylindrical PMMA CTDI phantom. Slice sensitivity profiles (SSPs) were measured for different nominal slice thicknesses, and an anthropomorphic phantom was used to assess image artifacts. Results were compared between single-source scans at pitch=1.0 and dual-source scans at pitch=3.2. In addition, image quality and temporal resolution of an ECG-triggered version of the DSCT high-pitch spiral scan mode were evaluated with a moving coronary artery phantom, and radiation dose was assessed in comparison with other existing cardiac scan techniques. Results: No significant differences in quantitative measures of image quality were found between single-source scans at pitch=1.0 and dual-source scans at pitch=3.2 for spatial and low contrast resolution, CT number accuracy and linearity, SSPs, image uniformity, and noise. The pitch value (1.6{<=}pitch{<=}3.2) had only a minor impact on radiation dose and image noise when the effective tube current time product (mA s/pitch) was kept constant. However, while not severe, artifacts were found to be more prevalent for the dual-source pitch=3.2 scan mode when structures varied markedly along the z axis, particularly for head scans. Images of the moving

  7. Value of spiral CT in the diagnosis of osteoid osteoma%螺旋CT对骨样骨瘤的诊断价值探讨

    Institute of Scientific and Technical Information of China (English)

    吴泽文; 吴信南; 陈焱君; 胡剑波

    2012-01-01

    Objective To analyze the value of the spiral CT in the diagnosis of osteoid osteoma. Methods 12 patients with osteoid osteoma proved by surgical pathology and the imaging of X-ray and spiral CT scan were retrospectively analyzed. Results Among the 12 cases, 6 cases of lesions in the femur and 2 cases in the tibia, 2 cases in the humerus and 2 cases in the other parts. CT showed the nidus and surrounding of the nidus with the different levels of hardening, and the nidus showed a round or oval translucent area with a diameter of 3~16mm. mean 9. 0mm, 7 cases wiht the center calcification. Conclusion Nidus is the key to diagnosis of osteoid osteoma, spiral CT scan shows nidus is the preferred method of examination in the diagnosis of osteoid osteoma.%目的 探讨螺旋CT在骨样骨瘤中的诊断价值.方法 对12例经病理证实且行X线和螺旋CT扫描检查的骨样骨瘤病人的影像学表现进行回顾性分析.结果 12例患者中,病灶位于股骨6例、胫骨2例、肱骨2例和其它部位2例.CT表现为瘤巢及其周围形成程度不同的反应性骨质硬化,瘤巢表现为一圆形或卵圆形的透亮区,直径为3~16mm,平均9.0mm,中心有钙化7例.结论 瘤巢是确诊骨样骨瘤的关键;螺旋CT扫描是显示瘤巢的首选检查方法,在骨样骨瘤诊断中具有重要的价值.

  8. The study of diagnostic accuracy of prospectively electrocardiogram-triggered high-pitch spiral acquisition using Flash dual-sources CT for the assessment of coronary stenoses

    International Nuclear Information System (INIS)

    Objectives: To prospectively investigate the diagnostic accuracy,image quality and radiation doses of prospectively ECG-triggered high-pitch spiral acquisition computed tomography coronary angiography (CTCA) using Flash dual-source CT for the diagnosis of significant coronary stenoses. Methods: Seventy-three patients underwent both CTCA and CCA. CTCA was performed using a Flash dual-source CT system with data acquisition at a high-pitch of 3.4. CCA served as the standard of reference. Radiation dose values were calculated using the dose-length product. Results: There were 925 vessel segments in 73 patients. (1) Diagnostic accuracy: the sensitivity, specificity and positive and negative predictive values were 93.2% (164/176), 96.4% (722/749), 85.9% (164/191), 98.4% (722/734) for segment assessment and 98.4% (123/125), 87.4% (83/95), 91.1% (123/135), 97.6% (83/85) for vessel assessment and 100% (44/44), 89.7% (26/29), 93.6% (44/47), 100% (26/26) for patient assessment. (2) Image quality: there were 2 coronary segments of right coronary artery and one segment of left circumflex artery with non-diagnostic image quality. There was no non-diagnostic image quality in left anterior descending artery. (3) Radiation dose: the effective radiation dose was (1.14 ± 0.10) mSv. Conclusions: CTCA using the prospectively ECG-triggered high-pitch spiral mode of the Flash dual-source CT system is associated with high diagnostic accuracy for the assessment of coronary artery stenoses at low dose. (authors)

  9. The role of whole body spiral CT in the primary work-up of polytrauma patients - comparison with conventional radiography and abdominal sonography; Die Rolle der Ganzkoerper-Spiral-CT bei der Primaerdiagnostik polytraumatisierter Patienten - Vergleich mit konventioneller Radiographie und Abdomensonographie

    Energy Technology Data Exchange (ETDEWEB)

    Albrecht, T.; Schlippenbach, J. von; Wolf, K.J. [Klinik und Poliklinik fuer Radiologie und Nuklearmedizin, Charite - Campus Benjamin Franklin (Germany); Stahel, P.F.; Ertel, W. [Klinik fuer Unfall- und Wiederherstellungschirurgie, Charite - Campus Benjamin Franklin (Germany)

    2004-08-01

    Purpose: To evaluate the role of routine 'whole body spiral CT' in the primary work-up of polytrauma patients for injuries of the thorax, abdomen and spine, and to compare the results with those of conventional radiography of the chest and spine and abdominal ultrasound. Materials and Methods: Fifty consecutive polytrauma patients underwent contrast-enhanced single slice spiral CT (5 mm collimation) from the vertex to the floor of the pelvis as part of the primary work-up after emergency room admission. Overlapping high resolution sections and sagittal reformations of the spine were obtained. Reports of additional chest radiographs (n=43), abdominal ultrasound examinations (n=47) and spine radiographs (n=36) performed in the emergency room were available for retrospective comparison. The 'final diagnoses', which served as the standard of reference, were taken from the patients' records using all information that became available until discharge or death, such as findings from further imaging, surgery and autopsy. Results: CT showed 109 (97%) of 112 thoracic and abdominal soft-tissue injuries. Relevant injuries missed were an early splenic laceration and an early pelvic hematoma, both of which became clinically apparent several hours later. There were 4 false positive CT findings. Conventional chest radiography demonstrated only 20% of thoracic and sonography 22% of abdominal injuries. Chest radiography and sonography produced 2 false-positive findings each. CT showed 66 (87%) of 76 vertebral fractures including all 19 unstable ones. CT missed 5 anterior vertebral body and 5 spinous/transverse process fractures. Conventional radiography found 71% of vertebral fractures including only 50% of the unstable one. (orig.)

  10. Clinical applications for multiplanar- and three-dimensional-reconstructions by helical-CT for the diagnosis of acetabular fractures; Klinischer Einsatz multiplanarer und 3D-Rekonstruktionen der Spiral-CT in der Diagnostik der Azetabulumfrakturen

    Energy Technology Data Exchange (ETDEWEB)

    Stroszczynski, C. [Strahlenklinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Schedel, H. [Strahlenklinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Stoeckle, U. [Unfallchirurgische Klinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Wellmann, A. [Strahlenklinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Beier, J. [Deutsches Herzzentrum Berlin, Virchow-Klinikum, Abt. Innere Medizin und Kardiologie (Germany); Wicht, L. [Strahlenklinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Hoffmann, R. [Unfallchirurgische Klinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany); Felix, R. [Strahlenklinik und Poliklinik im Virchow-Klinikum, Medizinische Fakultaet der Humboldt-Universitaet, Berlin (Germany)

    1996-03-01

    This review describes recent visualizations of computed tomography for the diagnosis of acetabular fractures. The techniques of conventional and helical-CT for the imaging of the acetabulum are compared. Furthermore, the different methods of multiplaner and three-dimensional reconstructions e.g. shaded surface display, maximum intensity projection, and volume rendering are presented. Figures of multiplanar and three-dimensional imaging for fractures of the pelvis is discussed. (orig.) [Deutsch] Es wird eine Uebersicht moderner computertomographischer Darstellungsmethoden der Azetabulumfrakturen vorgestellt. Auf die einzelnen Charaktersitika der konventionellen und Spiral-CT-Technik wird eingegangen, weiterhin werden die multiplanaren und verschiedenen 3dimensionalen Rekonstruktionsverfahren Shaded-Surface-Display (SSD), Maximum-Intensitaetsprojektion (MIP) und Volume-Rendering (VR) beschrieben und jeweils anhand von Abbildungen erlaeutert. Darueber hinaus wird das diagnostische Potential der einzelnen Methoden diskutiert. (orig.)

  11. Clinical evaluation of ventilation-perfusion scintigraphy and spiral CT angiography in the diagnosis of pulmonary embolism

    International Nuclear Information System (INIS)

    Objective: To evaluate the clinical capability of ventilation-perfusion (V-P) scintigraphy and spiral CT angiography (SCTA) in the diagnosis of pulmonary embolism (PE). Methods: The study was performed in 65 consecutive patients with suspected PE who underwent both V-P scintigraphy and SCTA. There were 43 men and 22 women aged 25-78 years (mean, 60.1 years). Averaged interval between V-P scintigraphy and SCTA was 2.6+0.7 days, and non anticoagulation was taken between the two tests. Of the 65 patients, angiography was also performed in 8. V-P scintigraphy was performed by using a SPECT equipped with parallel-hole, low-energy, all-purpose collimator. Both perfusion and ventilation images were acquired in eight projections. First, perfusion images were acquired with 500,000 counts per view after intravenous administration of 185 MBq of Tc-99m macroaggregated serum albumin. If perfusion imaging is normal, examination would be ended. When abnormality was found on perfusion imaging, ventilation images were followed with 400,000 counts per view after administration of 370 MBq of Tc-99m diethylenetriaminepentaacetic acid aerosol. V-P scintigrams are classified as normal, or low, intermediate or high probability of PE by using a modification of the diagnostic criteria, according to the PIOPED study. In this study, normal or low probability of PE is considered as negative, high probability of PE, as positive and intermediate probability of PE, as non-diagnostic. SCTA examinations were performed at 120 kVp and 200- 250 mA with 4-mm-thinck section and a pitch of 3. All scans were obtained in a caudocraninal direction, starting at the level of the lower hemi diaphragm and ending at the top of the aortic arch, with a breath holding lasted from 20 to 30 seconds. Images were reconstructed at l.5 intervals with a standard reconstruction algorithm. Patients received 80-100 ml of 60% iodinated contrast material administered through an automated injector. Images were analyzed with

  12. 螺旋 CT动态增强扫描在肺门肿瘤立体适形放射治疗中的价值%The value of spiral CT dynamically enhanced scanning in steric shape-fitting radiotherapy of hilar tumors

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Objective To judge hilar tumors and their involvement range and improve the ability for the 3D plan of steric shape- fitting radiotherapy of pulmonary cancer dicide target area.Method Spiral CT dynamically enhanced scanning was used to localize the target area and distinguish pilar tumors,atelactasis,pilar blood vessels and enlarged lymphoid tissues,and define locus and involvement area.Result Local contour showed by spiral CT enhanced dynamically scanning was superior to that by common CT.Conclusion Spiral CT dynamically enhanced scanning is an ideal simulation for 3D conformal radiotherapy.

  13. 44例儿童气道螺旋CT冠状扫描技术探讨%The coronal scans technique of spiral CT on children's airway

    Institute of Scientific and Technical Information of China (English)

    刘先凡; 何玲

    2011-01-01

    目的 探讨儿童气道螺旋CT冠状扫描体位与成像效果的关系.方法 回顾分析2008年7~12月44例气道螺旋CT冠状扫描影像资料,结合体位的设置及测量扫描线与气管长轴的角度探讨冠状扫描的气道显示效果.结果 气道显示效果佳者33例,扫描线基本与气道平行,最大角度小于2°;效果一般者8例,扫描线与气道成5~10°角;效果差者3例,扫描线与气道角度大于12°.结论 螺旋CT冠状扫描显示儿童气道全程佳,体位的设置直接影响气道全程的显示效果.%Objective To explore the relation of imaging effect and coronal scan position of spiral CT on children's airway. Methods Reviewed the images of spiral CT coronal scan on the 44 cases from July to December, 2008,to explore the airway show effect of coronal scan to combine the position design and measurement the angle of scan line and air way long axial. Results The effect of airway showed well in 33 cases,with the scan line parallel airway,the largest angle <2°, common in 8 cases with the scan line were angled 5-10° with airway,bad in 3 cases with the scan line were angled >12° with airway. Conclusion The airway show of children are well with spiral CT coronal scan,the scan position to direct affect the view effect of airway.

  14. Imaging diagnosis of solitary pulmonary nodules on an open low-field MRI system - comparison of two MR sequences with spiral CT

    International Nuclear Information System (INIS)

    Objective: To evaluate and compare two fast gradient-echo sequences (GRE) concerning the visualization of solitary pulmonary nodules with an open low-field MRI system in comparison to computed tomography. Materials and Methods: Fourteen patients with solitary pulmonary nodules detected by spiral CT ranging in size from 6 mm to 42 mm (mean 20 mm) underwent MRI on an open 0.2 T scanner using a spoiled 2D GRE (2D FLASH; TR/ TE/Flip = 100 ms/7.5 ms/30 ) and a totally refocused 2D steady-state GRE (True-FISP; TR/TE/FA = 7.3 ms/3.5 ms/80 ). The image quality concerning artifacts (by flow, breathing and susceptibility) and the morphologic characteristics of the nodules were scored and compared with CT by two independent radiologists. The diameters of the nodules measured by MRI were compared with CT measurements. The sequences were also evaluated with regard to the signal-to-noise ratio (SNR) of the lesion. Results: All lesions were detected with the 2D FLASH sequence. True-FISP failed to find a granuloma with a size of 6 mm. The 2D FLASH was rated significantly superior to true FISP concerning image quality artifacts by susceptibility as well as concerning to CT the presentation of nodule characteristics. In MR images, the size of lesions was significantly smaller than in CT images for both sequences: for 2D FLASH the mean difference was 0.9 mm and for true FISP 2.6 mm. The SNR of the nodules was significantly higher for the 2D FLASH than for the true FISP. Conclusion: In low field MRI, the 2D FLASH sequence is superior to the 2D true FISP sequence in imaging of pulmonary nodules. With the 2D FLASH sequence nodules of 6 mm or larger in size can be visualized. (orig.)

  15. Diagnostic efficacy of gadoxetic acid (Primovist)-enhanced MRI and spiral CT for a therapeutic strategy: comparison with intraoperative and histopathologic findings in focal liver lesions

    Energy Technology Data Exchange (ETDEWEB)

    Hammerstingl, Renate; Vogl, Thomas J. [Johann Wolfgang Goethe-Univ., Inst. of Diagnostic and Interventional Radiology, Frankfurt am Main (Germany); Huppertz, Alexander [Imaging Science Inst., Charite - Siemens, Berlin (Germany); Breuer, Josy; Balzer, Thomas [Gobal Clinical Development Diagnostics, Bayer Schering Pharma AG, Berlin (Germany); Blakeborough, Anthony [Royal Hallamshire Hospital, Dept. of Radiology, Sheffield (United Kingdom); Carter, Rick [Bayer Health Care Ltd., Burgess Hill, West Sussex (United Kingdom); Castells Fuste, Lluis [Hospital Vall d' Hebron, Liver Unit, Dept. of Internal Medicine, Barcelona (Spain); Heinz-Peer, Gertraud [Universitaetsklinik fuer Radiodiagnostik, Allg. Krankenhaus der Stadt Wien, Wien (Germany); Judmaier, Werner [Univ. Hospital Innsbruck, Dept. of Magnetic Resonance Imaging and Spectroscopy, Innsbruck (Austria); Laniado, Michael [Universitaetsklinikum Carl Gustav Carus, Technische Univ. Dresden, Inst. for Diagnostic Radiology, Dresden (Germany); Manfredi, Riccardo M. [Univ. of Verona, Dept. of Radiology, Verona (Italy); Mathieu, Didier G. [Centre d' Imagerie, Aix en Provence (France); Mueller, Dieter [Georg-August Univ., Dept. of Radiology, Goettingen (Germany); Mortele, Koenraad [Brigham and Women' s Hospital, Dept. of Radiology (L1), Boston, MA (United States); Reimer, Peter [Klinikum Karlsruhe, Dept. of Radiology, Karlsruhe (Germany); Reiser, Maximilian F. [Ludwig-Maximilians-Univ. Munich - Klinikum Grosshadern, Inst. of Clinical Radiology, Munich (Germany); Robinson, Philip J. [St James' s Univ. Hospital, Dept. of Clinical Radiology, Leeds (United Kingdom); Shamsi, Kohkan [Berlex Labs. Inc., Montville, NJ (United States); Strotzer, Michael [Univ. Hospital, Dept. of Diagnostic Radiology, Regensburg (Germany); Taupitz, Matthias [Universitaetsklinikum Charite, Med. Fakultaet der Humboldt-Univ., Dept. of Radiology, Berlin (Germany); Tombach, Bernd; Valeri, Gianluca; Beers, Bernhard E. van [and others

    2008-03-15

    A multicenter study has been employed to evaluate the diagnostic efficacy of magnetic resonance imaging (MRI) using the new liver-specific contrast agent gadoxetic acid (Gd-EOB-DTPA, Primovist), as opposed to contrast-enhanced biphasic spiral computed tomography (CT), in the diagnosis of focal liver lesions, compared with a standard of reference (SOR). One hundred and sixty-nine patients with hepatic lesions eligible for surgery underwent Gd-EOB-DTPA-enhanced MRI as well as CT within 6 weeks. Pathologic evaluation of the liver specimen combined with intraoperative ultrasound established the SOR. Data sets were evaluated on-site (14 investigators) and off-site (three independent blinded readers). Gd-EOB-DTPA was well tolerated. Three hundred and two lesions were detected in 131 patients valid for analysis by SOR. The frequency of correctly detected lesions was significantly higher on Gd-EOB-DTPA-enhanced MRI compared with CT in the clinical evaluation [10.44%; 95% confidence interval (CI): 4.88, 16.0]. In the blinded reading there was a trend towards Gd-EOB-DTPA-enhanced MRI, not reaching statistical significance (2.14%; 95% CI: -4.32, 8.6). However, the highest rate of correctly detected lesions with a diameter below 1 cm was achieved by Gd-EOB-DTPA-enhanced MRI. Differential diagnosis was superior for Gd-EOB-DTPA-enhanced MRI (82.1%) versus CT (71.0%). A change in surgical therapy was documented in 19 of 131 patients (14.5%) post Gd-EOB-DTPA-enhanced MRI. Gd-EOB-DTPA-enhanced MRI was superior in the diagnosis and therapeutic management of focal liver lesions compared with CT. (orig.)

  16. Detection of tibial condylar fractures using 3D imaging with a mobile image amplifier (Siemens ISO-C-3D): Comparison with plain films and spiral CT

    International Nuclear Information System (INIS)

    Purpose: To analyze a prototype mobile C-arm 3D image amplifier in the detection and classification of experimental tibial condylar fractures with multiplanar reconstructions (MPR). Method: Human knee specimens (n=22) with tibial condylar fractures were examined with a prototype C-arm (ISO-C-3D, Siemens AG), plain films (CR) and spiral CT (CT). The motorized C-arm provides fluoroscopic images during a 190 orbital rotation computing a 119 mm data cube. From these 3D data sets MP reconstructions were obtained. All images were evaluated by four independent readers for the detection and assessment of fracture lines. All fractures were classified according to the Mueller AO classification. To confirm the results, the specimens were finally surgically dissected. Results: 97% of the tibial condylar fractures were easily seen and correctly classified according to the Mueller AO classification on MP reconstruction of the ISO-C-3D. There is no significant difference between ISO-C and CT in detection and correct classification of fractures, but ISO-CD-3D is significant by better than CR. (orig.)

  17. Preoperative Localization of Insulinoma by Intra-arterial Spiral CT%导管法螺旋CT动脉造影对胰岛素瘤定位诊断的价值

    Institute of Scientific and Technical Information of China (English)

    李立; 吴沛宏; 谢传淼; 林浩皋; 陈林

    2003-01-01

    目的 评价动态螺旋CT动脉造影在胰岛素瘤定位诊断中的价值.方法 我院应用动态CT动脉造影方法诊断两例,并经手术病理证实.结果 胰岛素瘤在CT动脉造影现为高度致密结节.结论 动态螺旋CT动脉造影可极其准确显示胰岛素瘤,是胰岛素瘤术前定位诊断的最佳方法.%Objective To evaluate the value of intra-arterial dynamic spiral CT on preoperative localization of insulinoma.Methods Two patients with insulinoma proved by operative pathology were preoperatively localized by intra-arterial dynamic spiralCT.Results In intra-arterial spiral CT, two small insulinomas ( 1.5 - 2.0 cm in diameter) demonstrated as a significantly high densenodule 20 s later after initiation of injection of contrast medium. The course of high density lasted nearly 4 min.Conclusion Intra-arterial dynamic spiral CT could clearly detect small insulinoma, and might be one of most effective preopera-tive localization methods for small insulinoma.

  18. Postoperative follow-up of Stanford type A aortic dissections with Spiral-CT and MRI: Normal imaging findings and typical complications

    International Nuclear Information System (INIS)

    Purpose: To demonstrate normal postoperative Spiral-CT and MRI findings and typical complications in patients with aortic repair after Stanford type A aortic dissection. Results: The following postoperative complications were seen: Three pseudoaneurysms which developed at the proximal anastomoses of the Dacron prosthesis in two cases and at the insertion site of the reimplanted left coronary artery after implantation of a composite graft (Bentall procedure) in one case; one re-dissection; one perforation of the false lumen; periprostethic flow in one patient after surgical repair of type A dissection by the graft inclusion technique; progressive dilatation of the false lumen in 4 cases; dilatation of the aortic root in a Marfan patient after replacement of the ascending aorta. Conclusion: Precise knowledge of the surgical technique performed is crucial to accurate postoperative imaging evaluation. MRI is the method of choice in the postoperative follow-up of clinically stable patients with aortic dissections. (orig./AJ)

  19. Diagnosis of Acute Upper Gastrointestinal Perforation with Spiral CT%急性上消化道穿孔的螺旋CT诊断

    Institute of Scientific and Technical Information of China (English)

    林春; 张楚和; 吕怀志; 唐振国; 李亮平

    2014-01-01

    目的:探讨螺旋CT对急性上消化道穿孔的诊断价值。方法对49例经手术证实的急性上消化道穿孔患者的 CT 影像资料进行回顾性分析。结果49例患者中,十二指肠溃疡穿孔33例(67.35%);胃溃疡穿孔16例(32.65%),其中胃窦前壁穿孔9例(56.25%),胃小弯前壁穿孔7例(43.75%)。腹腔游离气体49例(100.00%),腹腔积液46例(93.88%),胃肠道壁不规则增厚或周围脂肪层模糊23例(46.94%)。结论通过螺旋CT诊断上消化道穿孔的患者,可以明确患者穿孔的病灶,能弥补X线平片的不足,为临床外科急腹症提供快速而可靠的诊断依据。%Objective To explore the diagnostic value of spiral CT in acute upper gastrointestinal perforation.Methods CT image data of 49 patients with acute upper gastrointestinal perforation confirmed by surgery were retrospectively analyzed. Results Among the 49 patients, duodenal ulcer perforation was observed in 33 (67.35%),gastric ulcer perforation in 16 (32.65%),intraperitoneal free gas in 49 (100.00%),ascites in 46 (93.88%),and irregular thickening of digestive wall and fuzzy fatty layer in 23(46.94%).Among the 16 patients with gastric ulcer perforation, perforation was located at anterior wall of the gastric antrum in 9 (56.25%) and at anterior wall of the lesser gastric curvature in 7 (43.75%). Conclusion Spiral CT can confirm perforated lesions, make up the deficiency of radiology and provide rapid and reliable diagnosis in patients with acute upper gastrointestinal perforation.

  20. Added diagnostic benefit of 16-row whole-body spiral CT in patients with multiple trauma differentiated by region and injury severity according to the ATLS registered concept

    International Nuclear Information System (INIS)

    Purpose: to determine the added diagnostic benefit of using MS-CT in multiple trauma patients differentiated by severity of injury and affected body region. Materials and methods: a retrospective analysis was performed of the 16-row whole-body spiral CT findings in 275 multiple trauma patients (73% men, 27% women; age 39.6 ± 18.9 years) with regard to additional findings and new findings obtained with CT compared to the findings obtained by conventional projection radiography and abdominal ultrasound in the emergency room. The additional and new findings were differentiated by body region (head, face, chest, pelvis, abdomen, spine) and the degree of severity according to the three classes of injuries distinguished by the ATLS registered concept (class 1: simple injury, class 2: potentially life threatening, class 3: immediately life threatening). Results: a total of 921 additional findings (findings potentially relevant for further diagnosis and therapy in addition to the findings obtained by conventional radiography or ultrasound) were obtained by MS-CT in all patients. The distribution by number of patients and body region was as follows: 22 neck, 76 face, 125 chest, 112 abdomen, 50 pelvis, and 91 spine. Most additional findings were categorized as potentially life threatening (ATLS class 2). In addition, there were 439 completely new findings, involving the head in 128 patients (mostly ATLS class 3), the face in 18, the chest in 47, the abdomen in 26, and the spine in 9 patients. Most new findings involving the face, abdomen, and spine were ATLS class 2 injuries. (orig.)

  1. 多层螺旋CT对颌骨放射性骨坏死的诊断价值%DIAGNOSTIC VALUE OF MULTI-SLICE SPIRAL CT FOR OSTERORADIONECROSIS OF JAW

    Institute of Scientific and Technical Information of China (English)

    林颖; 曹代荣; 游瑞雄; 江飞; 郑义浩

    2014-01-01

    Objective:To investigate the diagnostic value of multi-slice spiral CT for osteoradionecrosis of jaws (ORNJ). Methods:The CT ifndings of 27 cases ORNJ that were conifrmed by surgery and pathology were retrospectively analyzed. Results: The main CT ifndings of ORNJ were limited bone destruction and sequestration.Conclusions:Multi-slice spiral CT can clearly display location and appearance of lesions, sequestration, periosteal reaction and soft tissue mass formation. So multi-slice spiral CT has important value for diagnosis and differential diagnosis of ORNJ.%目的::探讨多层螺旋CT对颌骨放射性骨坏死(ORNJ)的诊断价值。方法:回顾性分析27例经手术、病理证实为ORNJ的CT表现。结果:ORNJ在多层螺旋CT上主要表现为局限性骨质破坏和死骨形成。结论:多层螺旋CT能清楚的显示ORNJ病灶的位置、形态、病灶内的死骨形成、有无骨膜反应及软组织肿块形成等,对ORNJ的诊断及鉴别诊断有重要的价值。

  2. Diagnostic value of dynamic enhanced spiral CT for solitary pulmonary nodule%螺旋CT动态增强扫描对孤立性肺结节的诊断价值

    Institute of Scientific and Technical Information of China (English)

    杨正军; 张连贵

    2012-01-01

    Object To investigate diagnostic value of dynamic enhanced spiral CT for solitary pulmonary nodule by analyzing scanning graphics diversification of solitary pulmonary nodule by dynamic enhanced Spiral CT. Method Retrospective analysis of solitary pulmonary nodule image feature of dynamic enhanced spiral CT of 58 patients who were diagnosed by lung tissue biopsy and surgery. Result Solitary pulmonary nodule image feature of malignant lesions displayed low-density shadow, however which of benign lesions mostly displayed calcified high-density shadow with CT flat layer of scan. Solitary pulmonary nodule image feature of malignant lesions displayed more homogeneous or heterogeneous enhancement shadow and which of Benign lesions displayed no or only envelope strengthen shadow by dynamic enhanced spiral CT. Strengthen shadow of lung cancer and inflammatory nodules was higher than which of Tuberculoma(p<0.01). Peak time of strengthen shadow image feature developed inflammatory nodules was delayed than which of lung nodules. Conclusion Solitary pulmonary nodule by dynamic enhanced spiral CT was characteristic and diagnostic value of dynamic enhanced spiral CT for solitary pulmonary nodule was higher.%目的探讨肺部孤立性结节在螺旋CT动态增强扫描中的表现,分析肺孤立性结节的CT诊断及动态增强的价值.方法回顾性分析本院58例经手术或肺组织穿刺活检诊断的肺部结节螺旋CT扫描动态增强表现及影像特征.结果肺孤立性结节CT平扫恶性病变多为低密度灶,良性病变多伴有钙化等高密度影,CT增强扫描恶性病变多均匀或不均匀强化,良性病变无强化或仅有包膜强化,肺癌和炎性结节的强化明显高于结核球(p<0.01),肺炎性结节强化峰值的时间较肺癌结节延迟.结论螺旋CT增强扫描使肺部结节性病变更具有特征性,对肺部结节的鉴别诊断具有较高的诊断价值.

  3. 胃癌术前螺旋CT分期的临床意义%The significance of spiral CT in the stage of gastric carcinoma before operation.

    Institute of Scientific and Technical Information of China (English)

    张谢夫

    2003-01-01

    目的:探讨胃癌术前人工气腹法螺旋CT(induced pneumo-peritoneum in spiral CT,SCTPP)检查对胃癌术前分期,选择治疗方案、确定手术方式的临床意义.方法:进展期胃癌52例先后进行常规SCT和SCTPP检查,检查结果与手术后病理结果进行对照.结果:常规SCT和SCTPP对T分期的准确性分别为72.3%和95.7%(P<0.05),对M分期的敏感性分别为61%和100%(P<0.05),二者均不能准确提供淋巴结转移情况.结论:SCTPP对术前判断胃癌局部病变情况及远处转移的准确性明显高于常规SCT,对选择治疗方案、确定手术方式具有重要的参考价值.

  4. Screenings of lung cancer with low dose spiral CT: results of a three year pilot study and design of the randomised controlled trial Italung-CT; Screening della neoplasia polmonare con TC spirale a bassa dose: risultati di uno studio pilota triennale e disegno dello studio clinico randomizzato Italung-CT

    Energy Technology Data Exchange (ETDEWEB)

    Picozzi, Giulia [Firenze Univ., Firenze (Italy). Radiodiagnostica I-Dipartimento di Fisiopatologia Clinica; Paci, Enrico [Azienda Ospedaliera Universitaria di Careggi, Firenze (Italy). Unita' di Epidemiologia Clinica e Descrittiva Centro per lo Studio e la Prevenzione Oncologica; Lopes Pegna, Andrea [Azienda Ospedaliera Universitaria di Careggi, Firenze (Italy). U.O. Pneumologia] [and others

    2005-02-01

    Purpose: To report the results of a three-year observational pilot study of lung cancer screening with low dose computed tomography (CT) and to present the study design of a randomised clinical trial named as Italung CT. Materials and methods: Sixty (47 males and 13 females, mean age 64{+-}4.5 years) heavy smokers (at least 20 packs-year) underwent three low-dose spiral CT screening tests one year apart on a single slice or multislice CT scanner. Indeterminate nodules were managed according to the recommendations of the Early Lung Cancer Action Project. Results: Indeterminate nodules were observed in 33 (55%) of the subjects (60% at the baseline screening test, 24% at the first annual test and 16% at the second annual test). The size of the largest indeterminate nodule was <5mm in diameter in 20 subjects. 10 of whom showed the nodule at the baseline test. Forty-five subjects (75%) completed the first annual test and 42 (70%) the second annual test. One (1.6%) prevalent lung cancer (adenosquamous carcinoma) and one (2.2%) incident lung cancer (small cell cancer at the first annual examination) were observed, as well as pulmonary localisation of Hodgkin's lymphoma (at the second annual test). In addition, one subject underwent lung surgery for a chondromatous hamartoma. Conclusions: The results of the pilot study are substantially in line with those of other observational studies of greater sample size. This justifies optimism about the reliability of the results in the screened arm of the Italung Ct trial which hast just began. [Italian] Scopo: Riportare i risultati di uno studio pilota osservazionale di screening della neoplasia polmonare con TC a bassa dose della durata di tre anni e presentare il disegno dello studio clinico randomizzato Italung-CT. Materiale e metodi: Sessanta (47 uomini e 13 donne, eta' media 64{+-}4,5 anni) forti fumatori (almeno 20 pacchetti/anno) sono stati sottoposti ad un esame basale e a due controlli annuali con TC single o

  5. 128层螺旋CT对肠扭转的诊断价值%Value of 128 Slice Spiral CT in Diagnosis of Intestinal Volvulus

    Institute of Scientific and Technical Information of China (English)

    范胜坤

    2015-01-01

    Objective Study 128 F spiral the CT turn round to the bowel of diagnosis value. Methods Review analysis 40 before the Shu the CT explicit diagnosis combine through surgical operation confirmation turn round for the bowel of clinical and image data. Results 40s are al through surgical operation confirmation, among them, the smal intestines turn round 31, 12 the bowel turn round 1 and the colon turn round 8.26 bowel tube has whirlpool to advertise for and 28 bowel fasten film blood vessel to have whirlpool to advertise for and 21 have banana to advertise for and 28 have beak to advertise for and 3 have bowel to fasten a film to change to advertise for up vein and artery, 32 have Ba wreath to advertise for, and 10 bowel fasten film artery to have blood to bolt formation. Conclusion 128 F spiral CT and empress processing technique of comprehensive usage turn round to the bowel of fixed position and set le sex have importance value, Be that the head choose check method.%目的探讨128层螺旋CT对肠扭转的诊断价值。方法回顾性分析40例术前CT明确诊断并经手术证实为肠扭转的临床及影像资料。结果40例全部经手术证实,其中小肠扭转31例,十二指肠扭转1例,结肠扭转8例。26例肠管有漩涡征,28例肠系膜血管有漩涡征,21例有香蕉征,28例有鸟喙征,3例有肠系膜上静脉和动脉换位征,32例有靶环征,10例肠系膜动脉有血栓形成。结论128层螺旋CT及后处理技术的综合运用对肠扭转的定位及定性有重要价值,可作为首选检查方法。

  6. 低剂量螺旋CT扫描在周围型肺癌诊断中的临床应用价值%Low Dose Spiral CT Scanning in the Diagnosis of Peripheral Lung Cancer Clinical Application Value

    Institute of Scientific and Technical Information of China (English)

    何揆

    2014-01-01

    目的探讨低剂量螺旋CT扫描在周围型肺癌诊断中临床应用价值。方法回顾性分析我院自2008年12月~2013年12月收治的30例经手术和病理证实周围型肺癌患者,在同一时间段内分别给予常规剂量螺旋CT扫描和低剂量螺旋CT扫描,比较两种检查方法对周围型肺癌征象的显示情况。结果肿瘤径线10 mm低剂量螺旋CT扫描显示的数量分别为8例、12例、5例,合计25例,常规剂量螺旋CT扫描显示的数量分别为9例、14例及6例,合计29例,两组相比较差异无统计学差异(>0.05);低剂量螺旋CT扫描与常规剂量螺旋CT扫描相比,低剂量螺旋CT扫描对坏死、钙化、细短毛刺、分叶征、血管集束征、胸膜凹陷征及阻塞性肺炎或肺不张等周围型肺癌征象的显示率无显著降低,其差异不具有统计学意义(>0.05)。结论低剂量螺旋CT扫描在降低辐射剂量的同时,也可以清楚显示周围型肺癌的各种征象,在诊断周围型肺癌中具有较高的临床应用价值。%Objective Explore the low-dose spiral CT scanning in peripheral lung cancer diagnosis in the clinical application value. Methods Retrospective analysis since December 2008 to December 2013 were 30 cases confirmed by surgery and pathology of peripheral lung cancer patients, at the same time period were given routine dose spiral CT scanning and low-dose spiral CT scanning, compare two methods of checking to show signs of peripheral lung cancer. Results Tumor diameter line 10 mm low-dose spiral CT scan revealed a number of 8 cases, 12 cases, 5 cases respectively, total 25 cases, conventional dose spiral CT scan showed the number of 9 cases, 14 cases and 6 cases respectively, total 29 cases, no statistical y significant dif erence compared with the two groups ( >0.05);Low-dose spiral CT scanning compared with conventional dose spiral CT scanning, low-dose spiral CT scanning of necrosis and calcification and fine short bur

  7. Aortic non communicating dissections. A study with helical CT; Studio dell'ematoma intramurale aortico. Aspetti con Tomografia Computerizzata spirale

    Energy Technology Data Exchange (ETDEWEB)

    Midiri, M.; Strada, A.; Stabile Ianora, A.A.; Rotondo, A.; Angelelli, G. [Bari Univ., Bari (Italy). Dipt. di Medicina Interna e Medicina Pubblica, Sez. di Diagnostica per Immagini; Scialpi, M. [Ospedale SS. Annunziata, Taranto (Italy); D' Agostino, D.; De Luca Tupputi Schinosa, L. [Bari Univ., Bari (Italy). Dipt. Emergenze Trapianto d' Organo, Sez. di Cardiochirurgia

    2000-09-01

    confused with aortic dissection. The imaging techniques (TEE, CT, MRI) have an important role in the final diagnosis of aortic hematoma. Presently Helical CT and MR angiography are the main tools in the early diagnosis of this condition before the development of complications. In this experience helical CT, before and after the administration of contrast material, was accurate in identifying the hematoma localization and extension. [Italian] Tale studio ha lo scopo di valutare con tecnica TC spirale gli aspetti semeiologici dell'ematoma intramurale dell'aorta e sottolineare il ruolo diagnostico decisivo di tale metodica nello studio di pazienti con quadro clinico acuto sospetto per dissezione aortica. E' stato condotto uno studio retrospettivo (dal 1995 al 1999) sulle immagini di 396 pazienti che avevano eseguito un esame TC in regime d'urgenza per sospetta dissezione aortica. Solo 18 pazienti (6 femmine, 12 maschi) presentavano aspetti tomodensitometrici caratteristici per ematoma intramurale aortico. Gli esami sono stati condotti tutti con TC spirale utilizzando i seguenti parametri: spessore dello strato 10 mm, image index 10, passo della spirale 1,5 mm, algoritmo standard con un minimo di 130 kV e 125 mA. Gli esami sono stati condotti prima e dopo iniezione di 130 ml di mdc in bolo rapido e ricercando i seguenti parametri: sede ed estensione longitudinale dell'ematoma spessore e densita' della parte aortica, presenza e localizzazione delle caclificazioni intimali, regolarita' del lume vero, presenza di emomediastino e/o emotorace. In tutti i 18 pazienti (8 di tipo A e 10 di tipo B) e' stato osservato ispessimento circoscritto parietale tipicamente iperdenso nelle scansioni di base e ipodenso in quelle dopo mdc. In 14/18 pazienti l'ispessimento assumeva disposizione eccentrica, in solo 4/18 era concentrico; in tutti i casi l'ispessimento e' risultato maggiore di 4 mm. In 18/18 pazienti sono state riscontrate

  8. Diagnosis and Differential Diagnosis of Spiral CT to Thyroid Tumor%螺旋CT对甲状腺肿瘤的诊断与鉴别价值

    Institute of Scientific and Technical Information of China (English)

    陈寅; 邹新农; 李威

    2011-01-01

    Objective:To evaluate spiral CT examination in the diagnosis of thyroid tumors and differential values.Methods:A retrospective analysis from January 2008 to April 2011 in our hospital,30 cases of thyroid cancer patients,their preoperative and postoperative CT examination pathological diagnosis and treatment diagnostic information to make comparisons,analyze their consistency. Results:The group of 30 cases of thyroid cancer patients,preoperative CT in 16 patients diagnosed with thyroid cancer,thyroid benign tumors in 14 patients,the diagnosis and postoperative pathologic diagnosis was consistent with rates of 94.1% and 92.9%.Appears on CT images of thyroid irregular margin,tumor-like nodules around the present peninsula,showing incomplete peritumoral capsule-like low density,sand-like calcification are characteristic of malignant thyroid tumors performance.Conclusion:Thyroid cancer patients using spiral CT scan for diagnosis,can be more accurately distinguish between the benign and malignant,particularly in the diagnosis of thyroid cancer is very accurate,and CT examination also clearly showed the tumor to the surrounding tissue and tumor metastasis violations,the development of treatment programs provide critical guidance.%目的:探讨螺旋CT检查对甲状腺良恶性肿瘤的诊断和鉴别价值.方法:回顾性分析2008年1月~2011年4月我院收治的30例甲状腺肿瘤患者,对其术前CT检查诊疗资料和术后病理组织诊断资料进行对比,分析两者的一致性.结果:本组30例甲状腺肿瘤患者中,术前CT诊断出16例患者为甲状腺癌、14例患者为甲状腺良性肿瘤,该诊断结果和术后病理组织诊断的符合率分别为94.1%和92.9%.CT图像上出现甲状腺边缘不规则、肿瘤周边呈现半岛样结节、瘤周呈现不完整包膜样低密度影、细沙样钙化,均是恶性甲状腺肿瘤的特征性表现.结论:甲状腺肿瘤患者采用螺旋CT扫描进行检查诊断,

  9. Reseach of the Value of three-dimensional reconstruction technique with spiral CT in detection of tracheobronchial foreign bodies in children%浅析螺旋 CT 三维重建技术在儿童气道阴性异物诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    冯坤鹏

    2014-01-01

    objective: to investigate the Value of three-dimensional reconstruction technigues with spiral ct in detection of tracheobronchial foreign bodies in children.Methods from february 2014 to august 2014 in our hospital, 34 children cases of tracheobronchial foreign bodies were referred to spiral ct scanning and three-dimensional reconstruction,and compared the results with the bronchoscope.Results 34 patients were gained clear images.27 foreign bodies were found by spiral ct .25 foreign bodies were found at the same place by spiral ct and bronchoscopy.2 cases shown false-negative image by spiral ct,and it turns to be sputum block,after removed by suction no foreign body was found by spiral ct , spiral ct and bronchoscopy results meet the rate of 92.6%.7 cases were shown no foreign bodies by spiral CT, after anti-inflammatory treatment 7 cases both discharged.Conclusion spiral ct reconstruction techniques is a non-invasive, accurate, rapid diagnostic method to evaluate the airway foreign body, so it is valuable to judge tracheobronchial foreign bodies in children.%目的:探讨螺旋 ct 三维重建技术在儿童气道阴性异物诊断中的应用。方法对2014年2月至2014年8月于我院收治的34例疑为气道阴性异物的患者进行螺旋 ct 扫描及三维重建,并与气管镜结果对比。结果34例患者均获得清晰的图像,其中27例患儿经螺旋 ct 三维重建诊断为气道异物,25例与支气管镜检查结果一致,假阴性患者2例,支气管镜检查为痰痂块,吸除后未见异物,螺旋 ct 三维重建与气管镜结果符合率为92.6%。7例患者经螺旋 ct 三维重建显示无异物,经抗炎治疗好转后出院。结论螺旋 ct 三维重建技术可准确评价气道异物,是无创、快速的诊断方法,在诊断气道阴性异物中具有重要的应用价值。

  10. Diagnostic value of multi-slice spiral CT in occult fractures of proximal tibia%多层螺旋CT对胫骨近端隐匿性骨折的诊断价值

    Institute of Scientific and Technical Information of China (English)

    周俊; 陈庆; 许文渊; 姚雯雯

    2012-01-01

    目的 探讨多层螺旋CT对胫骨近端隐匿性骨折的诊断价值.方法 回顾性分析23例数字放射摄影诊断可疑胫骨近端骨折病例的16层螺旋CT的横轴位、多平面重建、容积再现、最大密度投影,观察多层螺旋CT对胫骨近端隐匿性骨折的诊断率.结果 所选病例数字放射摄影均未显示明确骨折线,16层螺旋CT诊断胫骨近端骨折17例,其中胫骨平台骨折13例、胫骨髁间棘骨折4例;排除骨折6例,阳性率达73.9%.结论 多层螺旋CT对临床怀疑胫骨近端骨折而数字放射摄影不能确诊为骨折的病例能准确地作出诊断,对治疗方案的选择及预后的估计有重要价值.%Objective To discuss the diagnostic value of multi-slice spiral CT for the occult fracture of proximal tibia. Methods 23 patients with suspected fracture of proximal tibia by digital radiography were studied, and their images of transverse, multiplanar reconstruction, and volume rendering and maximum intensity projection of 16-slice spiral CT were analyzed. The diagnostic rate for occult fracture of proximal tibia with multi-slice spiral CT was observed. Results Digital radiography showed no definite fracture signs in all patients. 16-slice spiral CT showed fractures in 17 cases, including fractures of tibia plateau in 13 cases and tibia eminence in 4 cases. The other 6 patients showed negative on 16-slice spiral CT images. Conclusion Multi-slice spiral CT can be used to diagnose definitely occult fractures of proximal tibia and plays an important role in selecting therapy project and evaluating prognosis of occult fractures.

  11. 螺旋CT检查在空洞型肺结核中的应用价值%Clinical values of spiral CT examination in diagosis of cavitary pulminary tuberculosis

    Institute of Scientific and Technical Information of China (English)

    饶新民

    2011-01-01

    Objective To expolore the clinical values of spiral CT in diagosis of Cavitary pulminary tuberculosis. Methods 112 cases of cavitary pulmonary turberculosis diagnosed by the X-ray and spiral CT examination in 2005 - 2009 of our center, comparised the X-ray tilm and the performance of spiral CT,analyzed the rasults by the use of SPSS11. 5 software for the statistical a nalysis. Results In this group of 112 cases of tuberculosis,X-ray and spiral CT showed the lesions were:Cavitary 75,175 ;Bronchial spread of lung lesions 18,39; Satellite lesions 74,112; Lateral of cavity pleural thickening 5,21; Mediastinal, Hilar lymph nodes in creasing 0,5 respectivily. There were significant difference of lesions in the Spiral CT and X-ray photography. Conclusion Spiral CT have the great value in diagnosis of the number and the scope of the cavitary pulmomary tuberculosis, review determined after treatment etc. Diagnostic accuracy of pulmonary tuberlosis significantly better than the X-ray photography.%目的 探讨螺旋CT在诊断空洞型肺结核中的应用价值.方法 随机选取2005~2009年同时进行X线平片及螺旋CT检查确诊的112例空洞型肺结核患者,对比研究其X线平片及螺旋CT表现,对其结果应用SPSS11.5统计软件进行数据处理.结果 112例肺结核患者中X线平片与螺旋CT对病灶显示空洞分别为75个和175个,支气管肺播散灶18例和39例,卫星病灶74例和112例,空洞外侧胸膜增厚5例和21例,纵隔、肺门淋巴结增大0例和5例.两组数据比较差异有统计学意义(P<0.05).结论 螺旋CT在空洞型肺结核的病灶数目、范围及治疗后复查判定等方面具有重要价值,对肺结核诊断准确率显著优于X线平片.

  12. Comparison of magnetic resonance imaging and spiral CT in the diagnosis of thyroid microcarcinoma%磁共振成像和螺旋CT对甲状腺微小癌诊断的比较研究

    Institute of Scientific and Technical Information of China (English)

    王明伟; 朱红莲; 石硕艳; 王海艳; 唐南丽; 卢东丰

    2016-01-01

    目的 探讨磁共振成像(MRI)与螺旋CT在甲状腺微小癌(TMC)诊断中的价值,提高TMC的诊断正确率.方法 回顾性分析经手术病理证实的68例TMC患者术前MRI和螺旋CT表现,总结两者独立诊断及联合诊断TMC的符合率.结果 MRI和螺旋CT诊断TMC的符合率分别为73.53%(50/68)和66.18%(45/68).两者联合诊断TMC的符合率为88.24%(60/68),显著高于单独一种检查的诊断符合率,差异有统计学意义(P0.05).结论 螺旋CT对TMC病灶内微钙化的检出优于MRI,MRI对软组织具有较高的分辨能力,能够较好地显示小病灶,能更好地显示病变侵犯周围组织器官情况及颈部淋巴结的转移.两者联合应用能提高TMC的诊断准确率.%Objective To study the diagnostic value of magnetic resonance imaging (MRI) and spiral CT in thyroid microcarcinoma (TMC), in order to improve the diagnostic accuracy of TMC. Methods The preoperative imaging manifestations of MRI and spiral CT in 68 TMC patients who were confirmed by surgical pathology were retrospectively analyzed, and the diagnostic accordance rates were compared between the independent and the combined diagnosis. Results The diagnostic accordance rates of MRI and spiral CT in TMC were 73.53%(50/68) and 66.18%(45/68). The diagnostic accordance of combined MRI and spiral CT in TMC was 88.24%(60/68). The diagnostic accordance rate of combined MRI and spiral CT was significantly higher than that of independent examine, and there was statistical difference (P0.05). Conclusions Spiral CT is superior to MRI in the micro-calcification detection, and MRI, with a high resolution of soft tissue, can display the lesions of surrounding tissue organs and neck lymph node metastasis better. The combined examine can increase the diagnostic accuracy of TMC.

  13. 卵巢囊性畸胎瘤B超及多排螺旋CT的诊断价值比较%Comparison of the diagnostic value of ovarian cystic teratoma B ultrasound and multi-slice spiral CT

    Institute of Scientific and Technical Information of China (English)

    樊兆丽; 彭明洋

    2015-01-01

    Objective To investigate the diagnosis of ovarian cystic teratoma of B ultrasound and multi-slice spiral CT. Methods A retrospective analysis of 40 patients with surgically and pathologically confirmed ovarian cystic teratoma B ultrasound and CT image data.Results Multi-slice spiral CT diagnosis is higher than B ultrasound. Conclusion B ultrasound for routine screening, joint multi-slice spiral CT can improve diagnosis of ovarian cystic teratoma.%目的:探讨卵巢囊性畸胎瘤的B超及多排螺旋CT的诊断价值。方法:回顾性分析40例经手术及病理证实的卵巢囊性畸胎瘤的B超及CT影像资料。结果:多排螺旋CT的诊断符合率高于B超。结论:B超检查适用于常规筛选检查,联合多排螺旋CT检查,可提高卵巢囊性畸胎瘤的定性诊断。

  14. 16层螺旋CT多平面重组诊断卵巢癌的价值研究%A study on the 16-slice spiral CT of multi-planar reformation in the diagnosis of ovarian carcinoma

    Institute of Scientific and Technical Information of China (English)

    吴晓莉; 先世伟; 刘鲁

    2012-01-01

    目的 探讨16层螺旋CT薄层增强扫描后多平面重组(MPR)对卵巢癌的诊断价值.方法 回顾性分析65例临床怀疑卵巢癌患者的CT资料(薄层增强扫描),所有病例均经手术病理检查证实.结果 16层螺旋CT薄层增强扫描检查提示卵巢癌65例,经手术病理检查或穿刺活检证实53例,即真阳性53例,假阳性12例,卵巢癌的16层螺旋CT诊断准确性为81.5%.结论 16层螺旋CT薄层增强扫描后MPR对卵巢癌具有重要诊断价值.%Objective To investigate the diagnostic value of the 16-slice spiral CT with thin slices and enhancement scan after multi-planar reformation(MPR) in detection of ovarian carcinoma. Methods The CT data (thin slices and enhancement scan) of 65 cases suspected ovarian carcinoma were studied, all cases were confirmed by operation and pathology. Results Fifty-three of Six-five patients were diagnosed as ovarian carcinoma using the 16-slice spiral CT,in which there were Fifty-three patients with ovarian carcinoma proved by operation and pathology, Fifty-three patients with true-positive; twelve patients with false-positive; the diagnostic accuracy rate of the 16-slice spiral CT with thin slices and enhancement scan was 81. 5%. Conclusion The 16-slice spiral CT with thin slices and enhancement scan after multi-planar reformation(MPR) is valuable in diagnosis of ovarian carcinoma.

  15. 多层螺旋 CT在颌骨囊肿累及牙诊断中的作用研究%Diagnostic value of multislice spiral CT on cyst of jaw implicate tooth

    Institute of Scientific and Technical Information of China (English)

    钱江松; 刘小明; 区俊兴; 黎玉冰; 孟凡霞

    2015-01-01

    目的:探讨多层螺旋CT在颌骨囊肿累及牙诊断中的作用。方法对2010年3月至2013年5月东莞市厚街医院颌面外科收治的43例颌骨囊肿病例,术前行多层螺旋CT检查,了解可疑牙齿牙根与颌骨囊肿的关系并与术中情况对照。结果多层螺旋 CT 诊断颌骨囊肿可疑受累牙的准确率为97.01%。结论多层螺旋CT在颌骨囊肿受累牙诊断中有参考价值。%Objective To investigate the diagnostic value of multislice spiral CT on tooth involved in jaws cyst.Methods The study including 43 patients with jaws cyst, they received therapy at the oral maxillofacial surgery department in Houjie hospital of Dongguan city during March 2010 and May 2013.All of them took multislice spiral CT examination before operation to understand the relationship between the root of suspicious tooth and jaw cyst , and compared with intra -operative situation .Results The accuracy of multislice spiral CT in the diagnosis of suspected involvement of tooth in jaw cyst was 97.01%.Conclusions Multislice spiral CT has a reference value in the diagnosis of tooth involved in the jaws cyst .

  16. Initial application of prospective electrocardiography-triggering high-pitch spiral acquisition by dual-source CT in children with congenital heart diseases

    International Nuclear Information System (INIS)

    Objective: To explore the clinical value of prospective electrocardiography-triggering high-pitch spiral acquisition by dual-source CT (HP mode) in children with congenital heart diseases (CHD). Methods: Thirty-six patients (mean age: 0.67 years, range: 1 month to 2 years and 6 months; 25 males; mean weight: 7.7 kg) underwent prospective ECG-triggering high-pitch spiral acquisition. The dose length product (DLP) was recorded to calculate effective dose (ED). Two experienced radiologists made diagnosis and assessed the overall image quality by a five-point scale independently. The consistency of their judgment was determined by Kappa statistics. Surgeries were performed in 29 patients, and conventional cardiac angiography (CCA) was performed in 7 patients. The accuracy, sensitivity and specificity of HP mode were calculated based on the surgical or CCA findings. Results: The DLP was (5.12 ± 1.64) mGy·cm with a range of 2.4 mGy · cm to 9.2 mGy · cm and ED was (0.125 ± 0.027) mSv ranging from 0.078 mSv to 0.179 mSv. The average subjective image quality score was 4.2 ± 0.7. All images were diagnosable. Two radiologists made good agreement (K=0.774, P<0.05). The accuracy, sensitivity and specificity of HP mode were 98.9%, 94.2% and 99.8%, respectively. Conclusion: Low radiation dose with the accurate diagnosis of anomalies makes HP mode a new choice for children with CHD. (authors)

  17. CT triage for lung malignancy

    DEFF Research Database (Denmark)

    Kusk, Martin Weber; Karstoft, Jens; Mussmann, Bo

    2015-01-01

    : To assess detection performance using only coronal multiplanar reformations (MPR) when triaging patients for lung malignancies with CT compared to images in three orthogonal planes, and to evaluate performance comparison of novice and experienced readers. Material and Methods: Retrospective study of 63...... patients with suspicion of lung cancer, scanned on 64-slice multidetector computed tomography (MDCT) with images reconstructed in three planes. Coronal images were presented to four readers, two novice and two experienced. Readers decided whether the patients were suspicious for malignant disease...

  18. Multidetector spiral CT arthrography of the shoulder. Clinical applications and limits, with MR arthrography and arthroscopic correlations.

    Science.gov (United States)

    Lecouvet, Frédéric E; Simoni, Paolo; Koutaïssoff, Sophie; Vande Berg, Bruno C; Malghem, Jacques; Dubuc, Jean-Emile

    2008-10-01

    Although MR imaging and MR arthrography are the first choice modalities for shoulder imaging, CT arthrography (CTA) may be used successfully to address many clinical questions. The advent of submillimeter multiple detector CT technology and subsequent excellent three-plane resolution has considerably increased the quality of CTA examinations and has propelled this technique to the forefront in a growing number of indications. The combined use of iodinated contrast material for fluoroscopic confirmation of the articular position of the needle before injection of gadolinium chelates for MR arthrography offers the unique opportunity to compare CTA and MRA findings in carefully selected cases. This paper illustrates capabilities and limits of CTA for the study of rotator cuff tears, shoulder instability, cartilage lesions, anatomical variants and abnormalities of the glenoid labrum, with correlations to MR arthrography and surgical findings.

  19. Evaluation of Distal Femoral Rotational Alignment with Spiral CT Scan before Total Knee Arthroplasty (A Study in Iranian Population

    Directory of Open Access Journals (Sweden)

    Mahmoud Jabalameli

    2016-04-01

    Full Text Available Background: Evaluating the landmarks for rotation of the distal femur is a challenge for orthopedic surgeons. Although the posterior femoral condyle axis is a good landmark for surgeons, the surgical transepicondylar axis may be a better option with the help of preoperative CT scanning. The purpose of this study was to ascertain relationships among the axes’ guiding distal femur rotational alignment in preoperative CT scans of Iranian patients who were candidates for total knee arthroplasty and the effects of age, gender, and knee alignment on these relationships. Methods: One hundred and eight cases who were admitted to two university hospitals for total knee arthroplasty were included in this study. The rotation of the distal femur was evaluated using single axial CT images through the femoral epicondyle. Four lines were drawn digitally in this view: anatomical and surgical transepicondylar axes, posterior condylar axis and the Whiteside anteroposterior line. The alignment of the extremity was evaluated in the standing alignment view. Then the angles were measured along these lines and their relationship was evaluated. Results: The mean angle between the anatomical transepicondylar axis and posterior condylar axis and between the surgical transepicondylar axis and posterior condylar axis were 5.9 ± 1.6 degrees and 1.6±1.7 degrees respectively. The mean angle between the Whiteside’s anteroposterior line and the line perpendicular to the posterior condylar axis was 3.7±2.1 degrees. Significant differences existed between the two genders in these relationships. No significant correlation between the age of patients and angles of the distal femur was detected. The anatomical surgical transepicondylar axis was in 4.3 degrees external rotation in relation to the surgical transepicondylar axis. Conclusion: Preoperative CT scanning can help accurately determine rotational landmarks of the distal femur. If one of the reference axes cannot be

  20. MSCT对髋关节撞击综合征的影像学研究%Research of Rediology for Femoro-acetabular Impingement with Multislice Spiral CT

    Institute of Scientific and Technical Information of China (English)

    陈焱君; 刘波; 卢建烨; 吴共发; 李勉文; 叶强

    2013-01-01

    patients being elected out according to FAI imaging definition,and 20 others without known diseases affecting the proximal femur or symptoms of FAI underwent 64-slice CT scanning for medical purpose with the hip included in the scan range carrying out contrast studies for observing the various imaging factor.The volume CT data was used for further analysis to investigate the anatomy and osseous abnormality of FAI,and measuring (|A)-angle and EE-angle in all scanning.Result FAI divided into three type:cam-type,pincer-type and mix-type.There are varying degrees anatomy and osseous abnormality in all type of FAI.The mean value of α-angle of the control group was 41.826° ± 1.862°.The mean value of α-angle of the FAI group was 66.548° ± 9.169°,the differences of the α-angles of the two groups reached statistical significance (t=-1 1.926,P=0.000);Multiple comparisons demonstrate the α-angle of cam-type was the largest (71.851° ± 5.696°),and the α-angle of pincer-type was minimum (48.889° ± 3.364° ; total P<0.05).Multiple comparisons demonstrate that except result between the mean value of EE-angle of cam-type (21.550° ± 2.096°) and of the control group (21.845° ± 2.814°),pincer-type (16.386°± 1.211°) and mixed-type(16.729° ± 3.068°) was no statistical significance,the differences of the EE-angles between any other two groups reached statistical significance (P<0.05).Conclusion α-angle is the objective indicator reflecting the relationship between the offset reducing of anterior femoral head-neck junction and FAI,making significant value of diagnosis for cam-type FAI.EE-angle making significant value of diagnosis for pincer-type and mixed-type FAI.MSCT scanning and three-dimensional reconstruction can fully display the anatomy and osseous abnormality of the femur and acetabulum,and make diagnosis and classification of FAI accurately,providing reference value for treatment or surgical procedures.

  1. Clinical application of multi-slice spiral CT urography in traumatic urine leaka%外伤性尿漏多层螺旋CT诊断

    Institute of Scientific and Technical Information of China (English)

    俞国有

    2012-01-01

    Objective To explore the diagnostic value of multi-slice CT in the urine leakage. Methods 20 cases of urine leaks confirmed by clinical diagnosis underwent spiral CT plain scanning and triphasic dynamic enhancement scanning. The CT features on axial images and multiplanar reformation (MPR). maximum intensity projection (MIP) and volume rendering (VR) were reviewed. Results The breakage in renal parenchyma, subcapsular hematoma of kidney, prerenal fascia thickening appeared in 15 cases with pelvis leak affected by trauma. The excretory phase could detect 2 cases wfth ureteral leakage. 3 cases with bladder leak had the defect of posterior wall. Encapsulated effusion in rectal bladder space and eggshell-like calcification of the wall could be found, the contrast agent inpoured the urinary vesicle through the defect of the bladder wall. Conclusion Since the multi-slice CT urography (MSCT) examination clearly shows the leakage, the site of urine leakage. the scope of urinary vesicle. and other complications. it can be used as a preferred diagnostic method of urinary leakage.%目的 探讨多层螺旋CT对肾盂、输尿管及膀胱外伤性尿漏的诊断价值.方法 搜集20例经临床证实发生尿漏患者多层螺旋CT检查.全部行增强三期扫描.运用多种CT后处理技术(MPR、VR、MIP)综合分析其MSCT特点.结果 20例患者中,肾盂尿漏15例,输尿管尿漏2例,膀胱尿漏3例,排泄期表现为对比剂外渗,各种后处理技术可以清晰显示漏口的部位及范围,并可合并显示肝脾破裂、肾实质破裂、肾包膜下血肿、肾周间隙积液、骨盆多发骨折等.结论 MSCT延迟增强扫描能清晰显示尿漏的部位、漏口和并发症,对尿漏的诊断和选择治疗方案提供重要依据,可以作为尿漏诊断首选方法.

  2. Radiation Dose to the Thyroid and Gonads in Patients Undergoing Cardiac CT Angiography

    OpenAIRE

    Behroozi, Hamid; Davoodi, Mohammad; Aghasi, Shahriar

    2015-01-01

    Background: The present data show a global increase in the rate of cardiovascular disease. Cardiac CT angiography has developed as a fast and non-invasive cardiac imaging modality following the introduction of multi-slice computed tomogaraphy. Objectives: The aim of this study was to measure the radiation dose to the thyroid and pelvis regions in patients undergoing cardiac CT angiography using the Care Dose 4D method of 64-slice scanner. Patients and Methods: Eighty-one patients (41 males an...

  3. 慢性化脓性中耳炎的螺旋CT检查 (附74例93耳分析)%The Application of Spiral CT in Chronic Otitis Media

    Institute of Scientific and Technical Information of China (English)

    胡春洪; 肖根生; 诸伟; 谢道海; 刘济生; 王雪元; 陈剑华; 付引弟; 丁乙

    2000-01-01

    Objective:To assess the value of spiral CT in diagnosis and treatment of chronic otitis media.Methods:The spiral CT findings of 74 cases including 93 ears proved by operation and pathology were studied.Results:The lesions such as the disruption of the ossicular chain showed in spiral CT or three-dimensional image were in accord with those seen in the operation,the accuracy was 95.7%,the disruption of the ossicular chain and bony erosion in the tympanic cavity and antrum were severe in the typeⅢ chronic otitis media.Conclusion:Spiral CT is helpful to diagnose and definite the chronic otitis media,three-dimensional image can provide valuable information for surgery.%目的:探讨螺旋CT检查在慢性化脓性中耳炎诊治中的价值。方法:研究74例93耳慢性化脓性中耳炎,比较术前CT所见与手术及病理结果。结果:螺旋CT所见与手术结果基本相符,CT与病理分型符合率为95.7%。Ⅲ型慢性化脓 性中耳炎听骨链及中耳骨壁破坏较Ⅱ型范围广且程度重。三维CT听骨链显示情况与手术一致。结论:螺旋CT检查有助于慢性化脓性中耳炎的诊断和分型,三维CT成像对制定手术方案,提高手术安全性有很大潜力。

  4. Clinical application with 16-row spiral CT in diagnosis of esophageal hiatal hernia%16层螺旋CT在食管裂孔疝诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    黄婷

    2013-01-01

    目的:探讨16层螺旋CT在食管裂孔疝诊断中的应用价值.方法:回顾25例经胃镜、手术或上消化道造影证实的食管裂孔疝患者的16层螺旋CT资料并加以分析.结果:16层螺旋CT可以清晰显示食管裂孔疝的疝囊大小、部位、形态、密度、膈肌裂孔情况及病变与邻近结构的关系.结论:16层螺旋CT通过薄层断面和多平面重建技术(MPR)可以多角度显示疝囊及内容物,可为肿瘤性病变及其他不明原因膈肌膨隆的鉴别诊断提供有价值的诊断信息.%Objective: To investigate diagnostic value of 16 slice spiral CT in esophageal hiatal hernia. Methods: We reviewed 25 cases by gastroscope, operation or upper gastrointestinal radiography confirmed esophageal hiatal hernia in patients with 16 slice spiral CT data, and analyzed. Results: Image of 16 slice spiral CT could clearly show the esophageal hiatal hernia hernia sac size, position, shape, density, the diaphragmatic hiatus and pathological relationship with adjacent structures. Conclusion: 16 slice spiral CT through thin section and multiplanar reconstruction (MPR) can be multi-angle display hernia sac and contents, especially in the display of the diaphragmatic hiatus of broadening and lesions and their relation to the adjacent tissues have irreplaceable role.At the same time and neoplastic lesions and other unexplained diaphragm bulge in the differential diagnosis of provide valuable diagnostic information.

  5. An evaluation of the feasibility of assessment of volume perfusion for the whole lung by 128-slice spiral CT

    Energy Technology Data Exchange (ETDEWEB)

    Sun, Haitao [Imaging Center of Taian Central Hospital, Taian, Shandong (China); Gao, Fei; Li, Ning; Liu, Cheng [Shandong Univ., Shandong Medical Imaging Research Inst., CT Room, Shandong (China)], e-mail: liucheng491025@sina.com

    2013-10-15

    Background: Lung perfusion based on dynamic scanning cannot provide a quantitative assessment of the whole lung because of the limited coverage of the current computed tomography (CT) detector designs. Purpose: To evaluate the feasibility of dynamic volume perfusion CT (VPCT) of the whole lung using a 128-slice CT for the quantitative assessment and visualization of pulmonary perfusion. Material and Methods: Imaging was performed in a control group of 17 subjects who had no signs of disturbance of pulmonary function or diffuse lung disease, and 15 patients (five patients with acute pulmonary embolism and 10 with emphysema) who constituted the abnormal lung group. Dynamic VPCT was performed in all subjects, and pulmonary blood flow (PBF), pulmonary blood volume (PBV), and mean transit time (MTT) were calculated from dynamic contrast images with a coverage of 20.7 cm. Regional and volumetric PBF, PBV, and MTT were statistically evaluated and comparisons were made between the normal and abnormal lung groups. Results: Regional PBF (94.2{+-}36.5, 161.8 {+-}29.6, 185.7 {+-}38.1 and 125.5 {+-}46.1, 161.9 {+-}31.4, 169.3 {+-}51.7), PBV (6.7 {+-}2.8, 10.9 {+-}3.0, 12.9 {+-}4.5 and 9.9 {+-}4.6, 10.3 {+-}2.9, 11.9 {+-}4.5), and MTT (5.8 {+-}2.4, 4.5 {+-}1.3, 4.7 {+-}2.1 and 5.6 {+-}2.3, 4.3 {+-}1.5, 4.9 {+-}1.5) demonstrated significant differences in the gravitational and isogravitational directions in the normal lung group (P < 0.05). The PBF (154.2 {+-}30.6 vs. 94.9 {+-}15.9) and PBV (11.1 {+-}4.0 vs. 6.6 {+-}1.7) by dynamic VPCT showed significant differences between normal and abnormal lungs (P < 0.05), notwithstanding the four large lungs that had coverage > 20.7 cm. Conclusion: Dynamic VPCT of the whole lung is feasible for the quantitative assessment of pulmonary perfusion by 128-slice CT, and may in future permit the evaluation of both morphological and functional features of the whole lung in a single examination.

  6. Clinical relevance of multislice CT of the spine after osteosynthesis; Postoperative Kontrolle von osteosynthetischen Versorgungen der Wirbelsaeule mit der Mehrzeilen-Spiral-CT

    Energy Technology Data Exchange (ETDEWEB)

    Lorenzen, M.; Wedegaertner; Weber, C.; Adam, G.; Lorenzen, J. [Universitaetsklinikum Hamburg-Eppendorf (Germany). Klinik und Poliklinik fuer Diagnostische und Interventionelle Radiologie; Petersen, J.P. [Universitaetsklinikum Hamburg-Eppendorf (Germany). Klinik und Poliklinik fuer Orthopaedie

    2005-11-15

    Purpose: To examine the clinical relevance of multislice CT (MSCT) scans in postoperative checks of the spine after osteosynthesis. Material and Methods: The results of x-rays (apical lateral) in 30 patients having spinal surgery involving Xosteosynthesis (5 x metastasis, 20 x fractures, 3 x spondylolisthesis, 2 x scoliosis) were correlated to those of MSCT (140 kV, 200 mAs, collimation 4 x 1 mm, pitch 0.75; VolumeZoom, Siemens, Erlangen, Germany) with multiplanar reconstruction. Two radiologists independently checked the conventional X-ray and multislice CT scans for anatomical positioning, damage of osteosynthetic material, and intraspinal dislocation of bone fragments. Results: By correlating conventional spinal X-rays with MSCT, additional diagnostic information was gained. In 9 of 30 patients MSCT revealed the extraosseal location of a screw tip (X-ray, 5/30), in 8/30 patients a narrowing of the spinal canal by osteosynthetic material was detected in MSCT (X-ray, 4/30), in 2/30 patients osteal fragments were detected in the vertebral canal by MSCT (X-ray, 0/30). In MSCT and in conventional X-ray a fracture of the osteosynthesis was correctly diagnosed in 3 patients. One patient underwent corrective surgery for dislocated osteosynthetic material, which was solely diagnosed with MSCT. Conclusion: Due to the high degree of additional diagnostic information MSCT seems to be the method of choice for postoperative spinal surgery involving osteosynthesis. (orig.)

  7. Comparison of the Detection Rate of Carotid Artery Therosclerosis Plaque by Means of 16-Director Spiral CT and 320-director Volume CT%16排螺旋CT与320排容积CT对颈动脉粥样硬化斑块检出率的比较研究

    Institute of Scientific and Technical Information of China (English)

    贾云生; 高明洋; 王焕君

    2016-01-01

    目的:比较16排螺旋CT与320排容积CT对于颈动脉粥样硬化斑块检出率的差异。方法选取缺血性脑血管病患者48例,男性22例,女性26例,平均年龄(56±8)岁。经16排螺旋CTA检出颈动脉粥样硬化斑块的患者,进一步行320排容积CTA扫描,并与16排螺旋CTA的粥样硬化斑块检出率进行比较。结果16排螺旋CT与320排容积CT对于颈动脉粥样硬化斑块的检出率无明显统计学差异。结论对于基层医院,建议使用16排螺旋CT检出颈动脉斑块,以利于临床诊断及治疗。%Objective To compare the detection rate of carotid artery therosclerosis plaque by means of 16-director spiral CT and 320- director volume CT.Methods 48 patients of ICVD, 22 males and 26 females, with average age of (56±8) years old, were chosen. The patients detected plaques by 16-director spiral CT scans were further performed 320-director volume CT scans, and we compared the detection rate between the two methods. Results The detection rate of carotid artery therosclerosis plaque between 16-director spiral CT scans and 320-director volume CT scans showed no significant difference. Conclusion We recommend utilizing 16-director spiral CT to detect carotid artery therosclerosis plaque for basic hospital, facilitating the clinical diagnosis and treatment.

  8. Comparative analysis of X-ray and spiral CT scan in spinal fractures%脊椎骨折X线平片与螺旋CT对比分析

    Institute of Scientific and Technical Information of China (English)

    刘悌; 李行胜

    2011-01-01

    Objective :To analyze the features of X-ray film and spiral CT scans in spinal fractures for assessment of the diagnostic value. Methods:The imaging data were retrospectively analyzed in 156 cases with vertebral fractures undergone X-ray examination and spiral CT scanning. Results:Of the total 156 cases of spinal fractures, cervical spine fracture was seen in 45, thoracic vertebral fracture in 22, fracture of lumbar vertebra fracture in 79, sacrococcygeal vertebrae fracture in 10, cervicothoracic fracture in 6 and thoracolumbar in 15. X-ray film exposed vertebral fracture in 152(97.44% ), accessory fractures in 35(22.44% ), bone chips in 31 ( 19.87% ), spondylolisthesis of small joints in 25 ( 16.03 ), spinal stenosis in 31 ( 19.87 % ), kyphotic angulation in 43 (27.56%) and vertebra translocation in 23 ( 14.74 ), and the corresponding results by CT scanning were 156 (100%), 53 (33. 97%),46 (29. 49%),40 (26.64%) ,40(26.64%),50(32.05%) and 42(26.92% ) ,respectively. Comparison by x2 test showed the difference between X-ray film and CT scans concerning fractures of vertebra body, bone chips and spinal stenosis and deformation( P > 0.05; P < 0. 05 ). Besides, CT could reveal burst fractures, spinal cord compression, hematoma and soft tissue changes. Conclusion: X-ray film can be primary approach to diagnosis of vertebral fractures, while spiral CT can keep from misdiagnosis due to its function of three dimensional and multiplanar reconstruction.%目的::分析脊椎骨折X线平片与螺旋CT表现,探讨它们对脊椎骨折的诊断价值.方法:回顾分析156例脊椎骨折的X线平片与螺旋CT影像学资料.结果:156例脊椎骨折中,颈椎骨折45例,胸椎骨折22例,腰椎骨折79例,骶尾椎10例;其中颈胸椎骨折6例,胸腰椎骨折15例.X线平片显示椎体骨折、附件骨折、骨碎片、小关节滑脱、椎管狭窄、脊柱后突成角及椎体移位检出率分别为97.44%(152例)、22.44%(35例)、19.87%(31

  9. Added diagnostic benefit of 16-row whole-body spiral CT in patients with multiple trauma differentiated by region and injury severity according to the ATLS {sup registered} concept; Diagnostischer Zugewinn der 16-Zeilen-Ganzkoerper-Spiral-CT bei polytraumatisierten Patienten differenziert nach Koerperregion und Verletzungsschwere gemaess ATLS {sup registered} -Konzept

    Energy Technology Data Exchange (ETDEWEB)

    Maurer, M.H.; Knopke, S.; Schroeder, R.J. [Klinik fuer diagnostische und interventionelle Radiologie, Charite-Universitaetsmedizin Berlin (Germany)

    2008-12-15

    Purpose: to determine the added diagnostic benefit of using MS-CT in multiple trauma patients differentiated by severity of injury and affected body region. Materials and methods: a retrospective analysis was performed of the 16-row whole-body spiral CT findings in 275 multiple trauma patients (73% men, 27% women; age 39.6 {+-} 18.9 years) with regard to additional findings and new findings obtained with CT compared to the findings obtained by conventional projection radiography and abdominal ultrasound in the emergency room. The additional and new findings were differentiated by body region (head, face, chest, pelvis, abdomen, spine) and the degree of severity according to the three classes of injuries distinguished by the ATLS {sup registered} concept (class 1: simple injury, class 2: potentially life threatening, class 3: immediately life threatening). Results: a total of 921 additional findings (= findings potentially relevant for further diagnosis and therapy in addition to the findings obtained by conventional radiography or ultrasound) were obtained by MS-CT in all patients. The distribution by number of patients and body region was as follows: 22 neck, 76 face, 125 chest, 112 abdomen, 50 pelvis, and 91 spine. Most additional findings were categorized as potentially life threatening (ATLS class 2). In addition, there were 439 completely new findings, involving the head in 128 patients (mostly ATLS class 3), the face in 18, the chest in 47, the abdomen in 26, and the spine in 9 patients. Most new findings involving the face, abdomen, and spine were ATLS class 2 injuries. (orig.)

  10. Diagnostic Value of Brain Perfusion Imaging with 64 Multi-Detector Spiral CT in Early Cerebral Infarction%64排螺旋 CT 脑灌注成像对早期脑梗死的诊断价值

    Institute of Scientific and Technical Information of China (English)

    奚彬; 盛伟华; 唐建伟; 黄松; 宋黎涛

    2014-01-01

    目的:探讨64排螺旋 CT 脑灌注成像(CT perfusion imaging,CTP)对早期脑梗死的诊断价值。方法:临床拟诊早期脑梗死患者38例,均在症状出现24 h 内行头颅 CT 平扫及 CTP 检查。将脑梗死核心区、缺血半暗带(ischemic penumbra,IP)区与健侧对应区的情况做对比分析。结果:38例患者中,15例头颅 CT 平扫发现可疑脑梗死区,主要位于大脑半球,表现为密度轻度减低、局部脑沟稍变浅等;其余23例患者 CT 平扫未发现异常。38例患者的 CTP 检查均发现灌注异常区,表现为脑梗死区脑血流量(cerebral blood flow,CBF)与脑血容量(cerebral blood volume,CBV)均较健侧对应区明显下降,对比剂平均通过时间(mean transit time,MTT)较健侧对应区缩短,对比剂达峰时间(time to peak,TTP)较健侧对应区明显延长,差异均有统计学意义(P <0.01)。早期脑梗死患者 IP 区与梗死核心区比较,CBF、CBV、MTT 及 TTP 差异均有统计学意义(P <0.01);IP区与健侧对应区比较,CBF、MTT、TTP 差异均有统计学意义(P <0.05、0.01),CBV 差异无统计学意义(P >0.05)。获得随访的18例患者中,经积极溶栓等治疗后梗死区缩小6例,梗死区消失5例,仅表现为梗死区 TTP 和 MTT 延长、CBF 和 CBV 变化不大3例,梗死区无明显变化4例。结论:64排螺旋 CTP 检查可以准确地提示早期脑梗死。%Objective:To explore the diagnostic value of CT perfusion imaging(CTP)with 64 multi-detector spiral CT in early cerebral infarction.Methods:A total of 38 patients with suspected early cerebral infarction underwent plain CT and CTP within 24 h after the onset of related symptoms.The imaging results in infarction core area,ischemic penumbra (IP) and the contralateral normal region were comparatively analyzed.Results:Early cerebral infarction,mainly in cerebral hemispheres, were suspected

  11. 螺旋CT显示膝关节软组织损伤技术探讨%Spiral CT showed the knee joint of soft tissue injury technology discussed in this paper

    Institute of Scientific and Technical Information of China (English)

    秦妍滨; 于明

    2016-01-01

    目的:研究分析螺旋C T技术对于膝关节软组织损伤的诊断效果。方法:选取我院近年收治的36例膝关节软组织损伤患者作为研究对象,所有患者在入院后均通过了CT检查,收集所有患者的CT检查资料,以及CT检查结果,分析应螺旋CT对膝关节软组织损伤检查的操作方法以及诊断效果。结果:应用螺旋CT技术能清晰地显示患者膝关节各类骨折、关节腔、部分韧带以及软组织损伤,对膝关节软组织损伤具有较高的临床诊断价值。结论:螺旋CT联合多种重建技术对膝关节软组织损伤患者具有较高的临床诊断价值,值得在临床上广泛地推广应用。%Objective To study the analysis of the spiral CT technology to the diagnosis effect of knee joint of soft tissue injury. Methods Selection of 36 patients with knee joint soft tissue injury were admitted in our hospital in recent years as the research object, all of the patients in the hospital after all through the CT examination, all patients with CT examination information collection, and CT examination results, the analysis should be spiral CT examination to knee joint of soft tissue injury operation method and the effect of diagnosis.Results Spiral CT can clearly show that patients with knee joint fracture, articular cavity, part of the ligaments and soft tissue injury, the clinical diagnostic value of knee joint of soft tissue injury with high.Conclusion Spiral CT in combination with a variety of technical reconstruction in patients with knee joint soft tissue injury has high clinical diagnostic value, is worth popularizing widely in clinic application.

  12. 螺旋CT扫描对周围型小肺癌的诊断价值%The diagnostic value of spiral CT scanning for small peripheral lung cancer

    Institute of Scientific and Technical Information of China (English)

    彭俊琴; 汤日杰; 卢斌贵; 张海南

    2013-01-01

    目的 探讨螺旋CT扫描及薄层图像重建对周围型小肺癌(直径<2 cm)的诊断价值.方法 15例体检发现孤立肺结节(直径<2 cm)的患者行螺旋CT平扫加增强扫描