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Sample records for 16-slice multidetector-row ct

  1. Detection, visualization and evaluation of anomalous coronary anatomy on 16-slice multidetector-row CT

    International Nuclear Information System (INIS)

    Early identification and evaluation of relatively frequent anomalous coronary anatomy is quite relevant because of the occurrence of sudden cardiac death or related symptoms of myocardial ischemia. Selective coronary angiography (CAG) is invasive, expensive and cannot always provide the required information adequately. Recently, non-invasive imaging techniques such as magnetic resonance imaging and multidetector-row computed tomography (MDCT) have been shown to provide a good anatomical view of the coronary artery tree. This study aims to demonstrate the value of 16-MDCT for evaluation of anomalous coronary anatomy. In 13 patients scanned using 16-MDCT, six different coronary anomalies were diagnosed [two absent left main, one single vessel left coronary artery (LCA), three LCA originating from the right (two with interarterial course), six right coronary artery originating from the left, one double left anterior descending (LAD)]. Mean diagnostic quality, recorded by two observers using a 5-point scale (1= non-diagnostic to 5= excellent diagnostic quality), resulted in a mean score of 3.73 (SD 1.19) without any non-diagnostic result. MDCT offers an accurate diagnostic modality to visualize the origin and course of anomalous coronary arteries by a three-dimensional display of anatomy. Shortcomings in CAG can be overcome by the use of contrast-enhanced MDCT. (orig.)

  2. Diagnostic evaluation of the craniocervical vascular system with a 16-slice multi-detector row spiral CT - protocols and first experiences

    International Nuclear Information System (INIS)

    Purpose. The newly developed 16-slice multi detector row computed tomography (MDCT) allows for isotropic imaging at rotation times under 500 ms. We aim to describe our first experiences with this novel technology in the diagnostic imaging of the craniocervical vascular system.Methods. The craniocervical vascular system of 8 consecutive patients was examined with a standardized protocol with the new 16-slice MDCT. The volume covered included the carotid arteries from their origin at the aortic arch and the intracranial arterial and venous vessels in their entirety. Homogeneity of contrast, contrast-to-parenchyma ratios, image quality and radiation doses were assessed.Results. A homogeneous vessel-to-parenchyma ratio was reached in the carotids as well as in the intracranial arterial and venous vessels. Image quality was rated as excellent in all patients. The estimated mean effective radiation dose amounted to 2.31 mSv +/-0.57, the mean dose length product to 608 mGy*cm +/-151.Conclusion. The newly developed 16-slice MDCT technology appears to be a promising tool in the diagnostic assessment of the cervicocranial vessels. (orig.)

  3. Sacroiliitis in Ankylosing Spondylitis: Comparison with Multidetector Row CT and Plain Radiography

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    Yu, Ji Youn; Joo, Kyung Bin; Choi, Byeong Kyoo; Ryu, Jeong Ah; Kim, Tae Hwan; Choi, Woo Jung [Hanyang University Hospital, Seoul (Korea, Republic of)

    2009-03-15

    The objective of our study was to compare multidetector row CT and the plain radiographs for making the diagnosis and grading the sacroiliitis that accompanies ankylosing spondylitis. We wanted to determine the role of multidetector row CT for the evaluation of the sacroilitis in patients with ankylosing spondylitis. One hundred ninety two patients with clinically suspected ankylosing spondylitis were evaluated by conventional radiography and multidetector row CT. Two musculoskeletal radiologists retrospectively analyzed the images, and they graded the sacroiliitis using the modified New York Criteria. Multidetector row CT demonstrated a significantly higher sensitivity (74.5%, 83.3%) than did plain radiography (59.9%, 66.7%) for detecting early sacroiliitis (p<0.05). Multidetector row CT showed a higher grade of sacroiliitis in 114 and 127 of 384 sacroiliac joints. Performing multidetector row CT rather than plain radiography for making the diagnoses of accompanying ankylosing spondylitis allows an early start of treatment with a subsequently improved prognosis

  4. Esophageal injuries: Spectrum of multidetector row CT findings

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    Lutio di Castelguidone, Elisabetta de [Department of Radiology, I.N.T., IRCCS Fondazione G. Pascale, Via M. Semmola, I-80131 Naples (Italy)]. E-mail: e.delutio@virgilio.it; Merola, Stefanella [Department of Diagnostic Imaging, ' A. Cardarelli' Hospital, I-80131 Naples (Italy); Pinto, Antonio [Department of Diagnostic Imaging, ' A. Cardarelli' Hospital, I-80131 Naples (Italy); Raissaki, Maria [Department of Radiology, University Hospital of Iraklion, University of Crete Medical School, P.O. Box 1352, 711 10 Iraklion Crete (Greece); Gagliardi, Nicola [Department of Diagnostic Imaging, ' A. Cardarelli' Hospital, I-80131 Naples (Italy); Romano, Luigia [Department of Diagnostic Imaging, ' A. Cardarelli' Hospital, I-80131 Naples (Italy)

    2006-09-15

    Background: Aim of this study is to illustrate the multidetector row computed tomographic findings related to oesophageal injuries and their significance for therapeutic decisions. Method: From April 2002 to April 2005 we studied 16 patients with suspected oesophageal injury. Ten patients underwent standard chest radiograph, while five patients with suspected foreign body ingestion were submitted to cervical plain film and gastrografin swallow study. All 16 patients underwent multidetector row CT examination. Results: In six patients with cervical, thoracic and abdominal trauma, CT showed the presence of thoracic traumatic lesions and findings suggestive of perforation of the oesophagus. In five patients with foreign body ingestion cervical radiography was positive in only one case, while CT showed the presence of a foreign body in all cases. In three patients with post-intubation complications, CT showed the presence of perioesophageal fluid collection containing small gas bubbles in two cases and an oesophageal-aortic fistula in one case. In the remaining two patients with suspected spontaneous oesophageal perforation, CT demonstrated an oesophageal wall oedema and thickening in one case, and oesophageal fluid distension with perioesophageal small bubbles gas and fluid in the second case. Conclusion: Oesophageal injuries, when complicated with perforation, constitute a life-threatening condition. Knowledge of the CT signs of oesophageal injuries has important implications for the role of imaging at the time of initial diagnosis.

  5. Multidetector-row CT for spinal diseases

    International Nuclear Information System (INIS)

    Multi-detector-row CT is called second stage helical CT because it produces multi-volume slices in a short time. We have observed sagittal, coronal images for spinal diseases by this CT. Thirty-three sagittal images out of 39 post-myelography for spinal diseases were good images of compression of the dural sac, and 8 coronal images post myelography were good images of compression of the dural sac and spinal nerve roots. We obtained 11 sagittal images for OPLL, and all images were nearly equal to that of tomography. However, spinal tumors and inflammatory diseases are more easily obtained using MRI. Multi-detector-row CT is useful for spinal degenerative diseases. (author)

  6. Value of virtual tracheobronchoscopy and bronchography from 16-slice multidetector-row spiral computed tomography for assessment of suspected tracheobronchial stenosis in children

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    Honnef, Dagmar; Wildberger, Joachim E.; Das, Marco; Hohl, Christian; Mahnken, Andreas H.; Guenther, Rolf W.; Staatz, Gundula [University Hospital RWTH Aachen, Department of Diagnostic Radiology, Aachen (Germany); Barker, Michael [University Hospital RWTH Aachen, Department of Pediatrics, Aachen (Germany)

    2006-08-15

    To evaluate the value of dose-reduced 16-slice multidetector-row spiral computed tomography (16-MDCT) using virtual tracheobronchoscopy (VTB) and virtual bronchography (VBG) in children with suspected tracheobronchial stenosis. 12 children (4 d to 3 years, body weight 1.2 kg to 13.5 kg) with stridor and suspected tracheobronchial stenosis were examined by contrast-enhanced low-dose 16-MDCT. Conventional axial slices, MPRs, VTB, and VBG were calculated. Image findings were correlated with the results of fiberoptic bronchoscopy (12 out of 12) as a gold standard and subsequent surgery (8 out of 12). VTB and VBG demonstrated the fiberoptic bronchoscopically suspected tracheal stenosis in 11 of 12 children due to vascular compression because of the brachiocephalic trunk (6), a double aortic arch (2), a vascular compression of the left main bronchus (2), and a right aberrant subclavian artery (1). Eleven out of 12 stenoses were correctly depicted by conventional axial slices, MPRs, VTB, and VBG. Dose reduction was 79 to 85.8% compared to a standard adult chest CT. Dose-reduced 16-MDCT with the use of VTB and VBG is effective for the evaluation of tracheobronchial stenosis in children and correlates well with fiberoptic bronchoscopy. (orig.)

  7. CT paging arteriography with a multidetector-row CT. Advantages in splanchnic arterial imaging

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    Kobayashi, Seiji [Keio Univ., Tokyo (Japan). School of Medicine

    1999-11-01

    The purpose of this study is to assess the utility of CT paging arteriography with a multidetector-row CT as a replacement for conventional angiography in the evaluation of splanchnic arterial anomalies. Sixty-three patients underwent CT paging arteriography with a multidetector-row CT. In the 56 patients with conventional angiographic correlation, there was only one minor disagreement with CT paging arteriography. In the 7 patients who underwent IVDSA (intra venous digital subtraction angiography), CT paging arteriography defined four hepatic arterial anomalies which could not be depicted by IVDSA. In conclusion, CT paging arteriography provides noninvasive means to identify splanchnic arterial anomalies. (author)

  8. Acute aortic syndromes: Role of multi-detector row CT

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    Salvolini, Luca; Renda, Pietro [Department of Radiology, University ' Politecnica delle Marche' , Ancona (Italy); Fiore, Davide [Department of Radiology, University of Padova, Padova (Italy); Scaglione, Mariano [Emergency and Trauma CT Section, Department of Radiology, Cardarelli Hospital, Naples (Italy); Piccoli, GianPiero [Cardiosurgery Division, Ospedali Riuniti ' Torrette-Lancisi-Salesi' , Ancona (Italy); Giovagnoni, Andrea [Department of Radiology, University ' Politecnica delle Marche' , Ancona (Italy)], E-mail: a.giovagnoni@univpm.it

    2008-03-15

    Acute thoracic aortic syndromes encompass a spectrum of emergencies including aortic dissection, intramural haematoma, penetrating atherosclerotic ulcer and aneurysm rupture. All these life-threatening conditions require prompt diagnosis and appropriate management. To date multi-detector row Computed Tomography represents a valuable diagnostic tool especially in the emergency setting. This paper focus on the use of multi-detector row Computed Tomography in the evaluation of acute thoracic aortic syndromes and illustrates the key imaging findings related to each disease.

  9. Multidetector row-CT in evaluation of living renal donors

    Institute of Scientific and Technical Information of China (English)

    ZHANG Ji-qing; HU Xiao-peng; WANG Wei; LI Xiao-bei; YIN Hang; ZHANG Xiao-dong

    2010-01-01

    Background Multidetector-row CT (MDCT) has been evolving to the standard evaluating method of potential living donor in most centers, and can provide excellent details for selecting candidates and determining surgical technique.This study aimed to assess the value of MDCT in evaluation of the anatomy of living kidney donors and to reveal the prevalence of renal vascular variations in a Chinese population.Methods One hundred and four potential donors underwent MDCT and the data sets were post-processed for reformatted images with various techniques, such as maximum intensity projection (MIP), a volume-rendering technique (VR), and multiplanar reformation (MPR). Donor nephrectomies were performed on 97 candidates after MDCT evaluation with the findings during surgery constituting the standard of reference. Resulting MDCT images were compared with actual anatomy found during surgery. Results The MDCT images accurately displayed the anatomic structure of the main renal arteries and veins as well as the upper ureters, except in one case with horseshoe kidney. The prevalence of accessory arteries revealed in images was 27.2% (28/103) and early branching was found in 12.6% (13/103). Compared with findings during surgery, the detection of accessory arteries in MDCT images was 85.7% (6/7), and the detection of larger accessory arteries (>1.5 mm in diameter) was 100%. Detection of early branching was 100%.Conclusion MDCT helps accurately evaluate the renal anatomy of potential donors thus facilitating the planning of surgery.

  10. Coronary artery bypass graft (CABG) patency: Assessment with high-resolution submillimeter 16-slice multidetector-row computed tomography (MDCT) versus coronary angiography

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    Anders, Katharina [Department of Radiology, Friedrich-Alexander University of Erlangen-Nuremberg (Germany)]. E-mail: katharina.anders@idr.imed.uni-erlangen.de; Baum, Ulrich [Department of Radiology, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Schmid, Michael [Department of Internal Medicine II, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Ropers, Dieter [Department of Internal Medicine II, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Schmid, Axel [Department of Radiology, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Pohle, Karsten [Department of Internal Medicine II, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Daniel, Werner G. [Department of Internal Medicine II, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Bautz, Werner [Department of Radiology, Friedrich-Alexander University of Erlangen-Nuremberg (Germany); Achenbach, Stephan [Department of Internal Medicine II, Friedrich-Alexander University of Erlangen-Nuremberg (Germany)

    2006-03-15

    Purpose: To investigate the ability of 16-slice multidetector-row computed tomography (MDCT) to visualize coronary artery bypass graft (CABG) patency and to detect bypass stenoses. Materials and methods: Thirty-two patients with 94 grafts (20 mammary artery grafts, 74 venous grafts) were investigated by 16-slice MDCT using a scan protocol with 12 x 0.75 mm slice collimation (pitch 0.3), 420 ms rotation time and simultaneous electrocardiogram (ECG)-registration. One hundred milliliters iodinated contrast agent were injected with a delay according to the individually determined contrast agent transit time. Patients with heart rates above 60 bpm received oral beta-blockade. Cross-sectional images with a slice width of 1.0 mm (0.5 mm increment) were reconstructed using an ECG-gated half-scan reconstruction or a multisegment reconstruction algorithm depending on the heart rate. Bypass grafts were evaluated concerning patency and presence of stenoses {>=}50% diameter reduction on cross-sectional images, multiplanar reformations and maximum intensity projections by two independent observers. Results were compared to coronary bypass angiography. Results: Sixteen-slice MDCT results were compared to those of invasive coronary angiography concerning absence or presence of bypass graft occlusion or relevant stenosis {>=}50% lumen reduction. Coronary CT angiography (CTA) permitted detection of bypass occlusion with 100% sensitivity (28/28) and 98% specificity (64/65). Seventy-eight percent (observer 1) and 84% (observer 2) of all patent grafts were found to be evaluable concerning presence or absence of stenosis. In 34 of 40 (observer 1) and 38 of 43 (observer 2) bypass grafts, high-grade stenoses were correctly ruled out (specificity 85% versus 88%, sensitivity 80% and 82%). Yet, if all patients with either unevaluable grafts/graft anastomosis or relevant graft stenosis were excluded, only 8/32 patients (25%) had fully diagnostic 'negative' graft-CTA. According to

  11. Multidetector row CT study of percutaneous transhepatic intrahepatic portosystemic shunt

    International Nuclear Information System (INIS)

    Objective: To investigate imaging features of the liver, portal vein and hepatic vein or transhepatic inferior vena cava in patients with severe liver cirrhosis in multidetector row computed tomography (MDCT), and assess the feasibility, safety and clinical significance of percutaneous transhepatic intrahepatic portosystemic, shunt (PTIPS). Methods: Fifty patients with severe liver cirrhosis confirmed by clinical data and imaging examination were enrolled in this study. Simulation of intrahepatic portosystemic shunt by percutaneous transhepatic, approach is as follows. The right midaxillary line (the eighth oi ninth intercostal space) was selected as puncture point A the right branch of portal vein was puncture point B, transhepatic inferior vena cava was puncture point C, and the distal part of right portal vein was D. A-B-C connection is simulated as percutaneous transhepatic puncture tract, C-B-D connection is simulated as portosystemic shunt tract. After tri-phase contrast-enhanced CT scanning, postprocessing images through multiple planner reconstruction (MPR) were obtained. The data were indicated statistically by x-bar±s. And 9.5% confidence interval for mean was calculated. Anatomic relationship among the right portal vein, transhepatic inferior vena cava, hepatic artery and bile duct were analyzed for all patients. Results: The length of the needle (A-B-C) is (145.7±14.8) mm. The curvature of the needle (the angle of A-B line and B-C line) is (145.0±9.9) . The length of transhepatic shunt tract (B-C) is (42.7±7.2) mm. The length of the shunt tract (C-B-D) is (117.7±11.6) mm; The angle of the shunt tract (the angle of B-C line and B-D line) is (108.5±5.9)°. In 24/50 patients, transhepatic inferior vena cava locate in the dorsal of the right portal vein, in 26/50 patients they are in the same plane. In all patients, the right branches of hepatic artery and bile duct locate in the ventral of the right portal vein. Conclusion: The procedure of PTIPS is

  12. Use of multidetector row CT with volume renderings in right lobe living liver transplantation

    International Nuclear Information System (INIS)

    Multidetector row CT is a feasible diagnostic tool in pre- and postoperative liver partial transplantation. We can assess vascular anatomy and liver parenchyma as well as volumetry, which provide useful information for both donor selection and surgical planning. Disorders of the vascular and biliary systems are carefully observed in recipients. In addition, we evaluate liver regeneration of both the donor and the recipient by serial volumetry. We present how multidetector row CT with state-of-the-art three-dimensional volume renderings may be used in right lobe liver transplantation. (orig.)

  13. Application of multi-detector row helical scanning to postmyelographic CT

    International Nuclear Information System (INIS)

    The advent of a multi-detector row helical CT has made it possible to attain images over a broader area with good spatial resolution. We assessed whether postmyelographic CT scans obtained using this system provided more information than conventional imaging techniques. Postmyelographic CT scans were preoperatively obtained in 46 patients using a multi-detector row helical CT system. Reconstructed images in the sagittal and coronal planes in all patients and curved reformation images along the dural sac in 37 patients were compared with myelograms and conventional postmyelographic CT scans. In 34 patients comparison was also made with MR images. The multi-detector row CT images demonstrated deformities of the dural sac more clearly than the other modalities in 39 of the 46 patients. They also provided the best visualization of nerve root abnormalities in 24 of the 46 patients and clearly revealed the presence of spurs in all 22 patients with spinal canal stenosis. Postmyelographic CT scans made using a multi-detector row helical CT system provide more information on the dural sac, nerve sleeves, and their contents than other imaging techniques. (orig.)

  14. Usefulness of multidetector-row CT (MD-CT) for assessment of coronary artery stenosis

    International Nuclear Information System (INIS)

    Coronary arteries stenosis were evaluated in 49 cases by volume rendering (VR) and partial maximum intensity projection (partial MIP) using multidetector-row CT (MD-CT). Left main trunk (LMT) and left anterior descending artery (LAD) were less affected by cardiac pulsation artifact and presented good images. Right coronary artery (RCA) was affected by cardiac pulsation artifact and image quality was inferior as compared to left coronary artery (LCA). It is suggested that MD-CT is useful for assessment of coronary artery stenosis, especially LCA. (author)

  15. Comparison of MDCTA (16-slice multi-detector row computed tomography arthrography) and MRA (magnetic resonance arthrography) for detecting labral lesions of the shoulder

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    Choi, Seung A; Cha, Jang Gyu; Hong, Hyun Sook; Choi, Deuk Lin; Park, Jai Soung; Lee, Hae Kyung; Kim, Dae Ho [Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of)

    2007-11-15

    To compare the accuracy of 16-slice multi-detector row computed tomographic arthrography (MDCTA) and magnetic resonance arthrography (MRA) for making the diagnosis and classification of labroligamentous injuries. This study is a prospective series that used MRA and MDCTA to examine 23 patients who complained of shoulder instability. Two radiologists independently analyzed the MRA and MDCTA. The sensitivity, specificity, accuracy, positive and negative predictive values were calculated from the arthrograms and the arthroscopic findings. The images of MDCTA and MRA corresponded with the findings on arthroscopy. Both imaging modalities had the same sensitivity for detecting Bankart lesions (n = 10, 90%) and posterior labral tears (n = 2, 50%) on McNemar test ({rho} = 1.00). For superior labrum anterior-to-posterior (SLAP) lesions, 6 MRA cases and 4 MDCTA cases corresponded with the arthroscopic findings. The difference between the sensitivities of MDCTA (66.7%) and MRA (100%) was not significant ({rho} 0.09). We suggest that the sensitivity of diagnosing labral lesions that induce shoulder instability is similar for MDCTA and MRA. MDCTA is effective for diagnosing and evaluating shoulder instability.

  16. Detectability of the appendix with multidetector-row CT scanning and multiplanar reconstruction

    International Nuclear Information System (INIS)

    Twenty-six consecutive patients with the clinical diagnosis of appendicitis underwent multidetector-row CT (MD-CT) in order to detect entire longitudinal configuration of the appendix. While axial CT failed to detect the appendix in 7 patients, multiplanar reconstruction (MPR) demonstrated a longitudinal tubular structure continuous from the cecal caput in 25 patients (96.2%), including 7 patients whose post-surgical pathology were available. It is summarized that scanning and MPR images are advantageous to finding inflammatory processes in the appendix when the diagnosis of appendicitis remains ambiguous even with US. (author)

  17. Data explosion: the challenge of multidetector-row CT

    International Nuclear Information System (INIS)

    The development of multi detector-row CT has brought many exciting advancements to clinical CT scanning. While multi detector-row CT offers unparalleled speed of acquisition, spatial resolution, and anatomic coverage, a challenge presented by these advantages is the substantial increase on the number of reconstructed cross-sections that are rapidly created and in need of analysis. This manuscript discusses currently available alternative visualization techniques for the assessment of volumetric data acquired with multi detector-row CT. Although the current capabilities of 3-D workstations offer many possibilities for alternative analysis of MCDT data, substantial improvements both in automated processing, processing speed and user interface will be necessary to realize the vision of replacing the primary analysis of transverse reconstruction's with alternative analyses. The direction that some of these future developments might take are discussed

  18. Current development of cardiac imaging with multidetector-row CT

    International Nuclear Information System (INIS)

    Multidector-row CT (MDCT) with retrospective ECG gating allows scanning the entire heart with 1.25 mm slice thickness and 250 ms effective exposure time within 35 s investigation time. The resulting images allow for an accurate high-resolution assessment of morphological detail of both the coronary arteries and the cardiac chambers. Performing a contrast-enhanced MDCT angiography (MD-CTA) in addition to a non-enhanced scan for the detection and quantification of coronary calcifications may be indicated in patients with atypical chest pain and in young patients with high cardiovascular risk. This group of patients may show non-calcified plaques as the first sign of their coronary artery disease. As the proximal part of the coronary arteries is well displayed by MD-CTA it also helps to delineate the course in anomalous coronary vessels. Additional information is drawn from the preoperative use of MD-CTA do determine the distance of the left internal mammarian artery to the left anterior descending coronary artery prior to minimal invasive bypass grafting. Additional indications for MD-CTA are the non-invasive follow up after venous bypass grafting, PTCA, and coronary stent interventions. MD-CTA allows following the course of the coronary vessels to the level of third generation coronary segmental arteries. A definite diagnosis to rule out coronary artery disease can be reliably made in vessels with a diameter of 1.5 mm or greater. With MDCT a number of different atherosclerotic changes can be observed in diseased coronary arteries. Non-stenotic lesions may show tiny calcifications surrounded by large areas of irregularly distributed soft tissue. Calcifications in this type of atherosclerotic coronary artery wall changes appear as 'the tip of iceberg'. Heavy calcifications usually tend to be non-stenotic because of vessel remodelling resulting in a widening of the coronary vessel lumen. Therefore, heavy calcifications appear to act like an 'internal stent' for a

  19. T-staging of gastric cancer of air-filling multidetector-row CT: Comparison with hydro-multidetector-row CT

    International Nuclear Information System (INIS)

    Purpose: The purpose of this study was to evaluate the accuracy of T-staging of gastric cancer by air-filling multidetector-row CT (air-MDCT) compared with water-filling MDCT (hydro-MDCT). Materials and methods: One hundred fifteen patients with histologically diagnosed gastric cancer were included in this study. Fifty-eight patients underwent air-MDCT, and the remaining 57 had hydro-MDCT using a 64-channel scanner. Based on the volumetric data of contrast-enhanced MDCT obtained about 75 s after intravenously injecting 525 mg iodine per kilogram patients weight (525 mgI/kg) nonionic contrast material at the rate of 2 ml/s, oblique coronal and oblique sagittal multi-planar reformatted images perpendicular to the stomach wall, including the tumor, were reconstructed on a workstation. Mural invasion of gastric cancer into the gastric wall, as visualized by CT, was classified according to the TNM classification, and the results of T-staging by MDCT were compared with those by pathologic analysis after surgery. Results: Correct assessment of T-staging by air-CT was achieved in 48 of 58 patients (83%), and that by hydro-MDCT was 49 of 57 patients (86%). The sensitivity, specificity, and accuracy of the technique in determining the invasion of serosa were 88%, 93%, and 91% for air-CT and 83%, 95%, and 91% for hydro-CT. There were no significant differences between hydro-MDCT and air-MDCT in sensitivity (P = 0.73), specificity (P = 0.71) and accuracy (P = 0.98). Conclusion: Air-MDCT is a very valuable tool in T-staging of gastric cancer as well as hydro-MDCT.

  20. T-staging of gastric cancer of air-filling multidetector-row CT: Comparison with hydro-multidetector-row CT

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    Kumano, Seishi, E-mail: kumano@radiol.med.kindai.ac.jp [Department of Radiology, Kinki University School of Medicine, Osakasayama, Osaka 589-8511 (Japan); Okada, Masahiro; Shimono, Taro; Kuwabara, Masatomo; Yagyu, Yukinobu; Imaoka, Izumi; Ashikaga, Ryuichiro; Ishii, Kazunari; Murakami, Takamichi [Department of Radiology, Kinki University School of Medicine, Osakasayama, Osaka 589-8511 (Japan)

    2012-11-15

    Purpose: The purpose of this study was to evaluate the accuracy of T-staging of gastric cancer by air-filling multidetector-row CT (air-MDCT) compared with water-filling MDCT (hydro-MDCT). Materials and methods: One hundred fifteen patients with histologically diagnosed gastric cancer were included in this study. Fifty-eight patients underwent air-MDCT, and the remaining 57 had hydro-MDCT using a 64-channel scanner. Based on the volumetric data of contrast-enhanced MDCT obtained about 75 s after intravenously injecting 525 mg iodine per kilogram patients weight (525 mgI/kg) nonionic contrast material at the rate of 2 ml/s, oblique coronal and oblique sagittal multi-planar reformatted images perpendicular to the stomach wall, including the tumor, were reconstructed on a workstation. Mural invasion of gastric cancer into the gastric wall, as visualized by CT, was classified according to the TNM classification, and the results of T-staging by MDCT were compared with those by pathologic analysis after surgery. Results: Correct assessment of T-staging by air-CT was achieved in 48 of 58 patients (83%), and that by hydro-MDCT was 49 of 57 patients (86%). The sensitivity, specificity, and accuracy of the technique in determining the invasion of serosa were 88%, 93%, and 91% for air-CT and 83%, 95%, and 91% for hydro-CT. There were no significant differences between hydro-MDCT and air-MDCT in sensitivity (P = 0.73), specificity (P = 0.71) and accuracy (P = 0.98). Conclusion: Air-MDCT is a very valuable tool in T-staging of gastric cancer as well as hydro-MDCT.

  1. Multidetector Row CT Detection of a Patent Foramen Ovale Causing Neurologic Deficits in an Adolescent: A Case Report

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    Lee, Jung Bin [Dept. of Radiology, Soonchunhyang University College of Medicine, Bucheon (Korea, Republic of); Kim, Dong Hun; Oh, Jae Hee [Dept. of Radiology, Chosun University College of Medicine, Gwangju (Korea, Republic of); Seo, Hye Sun [Dept. of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon (Korea, Republic of); Suk, Eun Ha [Dept. of Anesthesiology and Pain Medicine, Asan Medical Center, Seoul (Korea, Republic of)

    2012-02-15

    A patent foramen ovale (PFO) is a persisting fetal circulation structural abnormality that can cause neurologic deficits such as migraine and cryptogenic stroke. Here we report a case of PFO diagnosed by cardiac multidetector row CT in an adolescent male with chronic migraine and stroke.

  2. Multidetector Row CT Detection of a Patent Foramen Ovale Causing Neurologic Deficits in an Adolescent: A Case Report

    International Nuclear Information System (INIS)

    A patent foramen ovale (PFO) is a persisting fetal circulation structural abnormality that can cause neurologic deficits such as migraine and cryptogenic stroke. Here we report a case of PFO diagnosed by cardiac multidetector row CT in an adolescent male with chronic migraine and stroke.

  3. [Multidetector row CT in assessment of coronary artery calcification on hemodialisis].

    Science.gov (United States)

    Caro, P; Delgado, R; Dapena, F; Núñez, A

    2007-01-01

    Vascular calcification is a strong predictor of cardiovascular and all-cause mortality. Coronary artery calcification is more frequent, more extensive and progresses more rapidly in CKD than in general population. They are also considered a marker of coronary heart disease, with high prevalence and functional significance. It suggests that detection and surveillance may be worthwhile in general clinical practice. New non-invasive image techniques, like Multi-detector row CT, a type of spiral scanner, assess density and volume of calcification at multiple sites and allow quantitative scoring of vascular calcification using calcium scores analogous to those from electron-beam CT. We have assessed and quantified coronary artery calcification with 16 multidetector row CT in 44 patients on hemodialysis and their relationship with several cardiovascular risk factors. Coronary artery calcification prevalence was of 84 % with mean calcium score of 1580 +/- 2010 ( r 0-9844) with calcium score > 400 in 66% of patients. It was usually multiple, affecting more than two vessels in more than 50%. In all but one patient, left anterior descending artery was involved with higher calcium score level at right coronary artery. Advanced age, male, diabetes, smoking, more morbidity, cerebrovascular disease previous, and calcium-binders phosphate and analogous vitamin D treatment would seem to be associated with coronary artery calcification. Coronary artery calcification is very frequent and extensive, usually multiple and associated to modifiable risk factors in hemodialysis patients. Multi-detector-row CT seems an effective, suitable, readily applicable method to assess and quantify coronary artery calcification. PMID:18336102

  4. Multidetector-row CT angiography of hepatic artery: comparison with conventional angiography

    International Nuclear Information System (INIS)

    To determine the usefulness of three-dimensional CT angiography using multidetector-row CT (MD-CT) for delineating the arterial anatomy of the liver. Hepatic arterial three-dimensional CT angiography was performed using MDCT (lightspeed Qx/I; GE medical systems, milwaukee, Wis., U.S.A.) in 45 patients with HCC undergoing conventional angiography for transcatheter hepatic arterial chemoembolization. The scanning parameters during the early arterial phase were 2.5 mm slice thickness, 7.5 mm rotation of table speed, and a pitch of 3. Images were obtained by one radiologist using maximum intensity projection from axial CT images obtained during the early arterial phase. Two radiologists blinded to the findings of conventional angiography independently evaluated the hepatic arterial anatomy and the quality of the images obtained. Compared with conventional angiography, reader A correctly evaluated the hepatic arterial anatomy depicted at three-dimensional CT angiography. Reader B's evaluation was correct in 40 of 45 patients. Interobserver agreement was good (kappa value, 0.73), and both readers assessed the quality of three-dimensional CT angiography as excellent. Three-dimensional CT angiography using MDCT was accurate for delineating the arterial anatomy of the liver, and interobserver agreement was good. The modality may provide, prior to conventional angiography, valuable information regrading a patient's hepatic arterial anatomy

  5. A novel iterative reconstruction algorithm allows reduced dose multidetector-row CT imaging of mechanical prosthetic heart valves

    OpenAIRE

    Habets, Jesse; Symersky, Petr; de Mol, Bas A. J. M.; Willem P Th M Mali; Leiner, Tim; Budde, Ricardo P.J.

    2011-01-01

    Multidetector-row CT is promising for prosthetic heart valve (PHV) assessment but retrospectively ECG-gated scanning has a considerable radiation dose. Recently introduced iterative reconstruction (IR) algorithms may enable radiation dose reduction with retained image quality. Furthermore, PHV image quality on the CT scan mainly depends on extent of PHV artifacts. IR may decrease streak artifacts. We compared image noise and artifact volumes in scans of mechanical PHVs reconstructed with conv...

  6. Volumetric Measurements of Lung Nodules with Multi-Detector Row CT: Effect of Changes in Lung Volume

    OpenAIRE

    Goo, Jin Mo; Kim, Kwang Gi; Gierada, David S.; Castro, Mario; Bae, Kyongtae T.

    2006-01-01

    Objective To evaluate how changes in lung volume affect volumetric measurements of lung nodules using a multi-detector row CT. Materials and Methods Ten subjects with asthma or chronic bronchitis who had one or more lung nodules were included. For each subject, two sets of CT images were obtained at inspiration and at expiration. A total of 33 nodules (23 nodules ≥ 3 mm) were identified and their volume measured using a semiautomatic volume measurement program. Differences between nodule volu...

  7. Usefulness of multiplanar reformatted images of multi-detector row helical CT in assessment of biliary stent patency

    International Nuclear Information System (INIS)

    To evaluate the usefulness of multi-detector row helical CT (MDCT), multiplanar reformatted images for the noninvasive assessment of biliary stent patency, and for the planning for management in patients with a sele-expandable metallic stent due to malignant biliary obstruction. Among 90 consecutive patients, from August 1999 to July 2003, 26 cases in 23 patients with malignant biliary obstruction who underwent self-expandable metaIlic stent insertion in the biliary system and percutaneous transhepatic biliary drainage within 7 days after CT were enrolled in this study. On CT images, the complete and functional obstruction of the stent and the precise level of obstruction were evaluated. The presence of an enhancing intraluminal mass or wall thickening around stent was determined, and the causes of obstruction were evaluated. These findings were then compared with percutaneous transhepatic cholangiography. Multi-detector row helical CT correctly demonstrated the patency of a stent in 24 cases (92.3%). It was adequate in helping to depict the precise level of stent occlusion in 23 cases (88.5%). Multi-detector row helical CT also revealed the extent of tumor that represented as an enhancing intraluminal mass or wall thickening around the stent in 23 cases, and this was represented as complete obstruction on percutaneous transhepatic cholangiography. In the case of functional obstruction, MDCT predicted the possible cause of the obstruction. Multiplanar reformatted images of multi-detector row helical CT is a useful imaging modality for the noninvasive assessment of stent patency and the precise level of obstruction when stent obstruction is suspected in the patients with self-expandable metallic stent due to malignant biliary obstruction. It can also predict the possible cause of the obstruction and allows adequate planning for the medical management of such cases

  8. Multidetector-row helical CT: analysis of time management and workflow

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate time management and workflow for multidetector-row helical CT (MDCT). Time for patient and data handling of at total of 580 patients were evaluated at two different time periods (December 1999, August 2000), each for the following baseline measurements: (a) change of clothes/instruction; (b) patient placement on the CT table/i.v. catheter; (c) CT planning and programming; (d) CT data acquisition; (e) CT data reconstruction; (f) CT data storage/printing. All imaging was performed on a Somatom Volume Zoom (Siemens, Erlangen, Germany). Time measurements summarized for different CT protocols revealed the following: (a) 5:01 min (±2.06 min); (b) 4:36 min (±2.43 min); (c) 4:11 min (±2.55 min); (d) 0:43 min (±0.15 min); (e) 6:59 min (±2.39 min); (f) 09:51 min (±3.51 min). Planning and programming was most time-consuming for CT angiography, whereas chest and abdominal CT needed only 3:26 and 3:30 min, respectively. Reconstruction time was highest for HRCT (9:22 min) and CTA (9:03 min). Data storage/printing was most time-consuming for HRCT (13:02 min), followed by combined neck-chest-abdomen examinations (12:19 min). Comparing the two time periods, during which a software update was performed, a mean time reduction of 4:31 min per patient (15%, p<0.001) was achieved. Whereas CT data acquisition time is no longer a problem with MDCT, patient management, data reconstruction, and data storage are the most time-consuming parts. Well-trained technicians, state-of-the-art workstations, and fast networking are the most important factors to improve workflow. (orig.)

  9. 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

  10. ECG-gated multi-detector row CT for assessment of mitral valve disease: initial experience

    International Nuclear Information System (INIS)

    Our objective was to evaluate applicability and image quality of contrast-enhanced, retrospectively ECG-gated multi-detector row CT (MDCT) for visualization of anatomical details of the mitral valve and its apparatus, and to determine the value of MDCT for diagnosing abnormal findings of the mitral valve. Twenty consecutive patients with mitral valve disease underwent MDCT preoperatively. Two readers assessed visibility of the mitral valve annulus, mitral valve leaflets, tendinous cords, and papillary muscles by using a four-point Likert grading scale. Abnormal mitral valve findings [thickening of the mitral valve leaflets, presence of mitral annulus calcification (MAC), and calcification of the valvular leaflets] were compared with preoperative echocardiography and intraoperative findings. Visibility of the mitral valve annulus and mitral valve leaflets was good or excellent in 15 patients (75%) and in 19 patients (95%) for papillary muscles. The MDCT yielded a 95-100% agreement compared with echocardiography and surgery with regard to the assessment of mitral valve leaflet thickening and the presence of calcifications of the mitral valve annulus or mitral valve leaflets. Intermodality agreement between MDCT and echocardiography was excellent with regard to classification of mitral valve leaflet thickness (κ=1.00) and good regarding classification of MAC thickness (κ=0.73). Contrast-enhanced, retrospectively ECG-gated MDCT allows good to excellent visualization of anatomical details of the mitral valve and its apparatus, and demonstrates good agreement with echocardiography and surgery in diagnosing mitral valve abnormalities. (orig.)

  11. Optimal iodine dose for 3-dimensional multidetector-row CT angiography of the liver

    International Nuclear Information System (INIS)

    Purpose: To clarify the optimal iodine dose of contrast material for 3-dimensional multidetector-row CT angiography (3D-MDCTA) of the venous vasculature of the liver using volume rendering technique. Materials and methods: This study included 103 patients who were randomly assigned to 5 contrast-enhanced MDCT protocol groups with different body-weight-tailored doses of contrast material: 500, 600, 630, 650, and 700 mgI/kg body weight. The arterial, portal, and hepatic parenchymal phases were obtained to evaluate enhancement values of the aorta, portal vein, and hepatic vein. Visualization of the portal and hepatic veins on the volume-rendering images of 3D-MDCTA was evaluated using a 5-point grade. Dunnett's test was used to compare the mean enhancement value and mean grades of image quality (700 mgI/kg dose group was control). Results: The mean enhancement values of portal and hepatic vein in the group with 500 and 600 mgI/kg were significantly lower than those of the control group. During visual assessment, a significantly lower mean grades were observed in 500 mgI/kg groups for the portal vein, and 500 and 600 mgI/kg groups for hepatic vein. There were no significant intergroup differences in mean enhancement values and visual assessment among the groups using 630 mgI/kg or more. Conclusion: Iodine doses of 630 mgI/kg was recommended for 3D-MDCTA

  12. Optimized image reconstruction for detection of deep venous thrombosis at multidetector-row CT venography

    Energy Technology Data Exchange (ETDEWEB)

    Das, Marco; Muehlenbruch, Georg; Mahnken, Andreas Horst; Guenther, Rolf W.; Wildberger, Joachim Ernst [University Hospital, University of Technology (RWTH), Department of Diagnostic Radiology, Aachen (Germany); Weiss, Claudia [RWTH Aachen, Institute of Medical Statistics, Aachen (Germany); Schoepf, U. Joseph [Medical University of South Carolina, Department of Radiology, Charleston, SC (United States); Leidecker, Christianne [Institute of Medical Physics, University of Erlangen, Erlangen (Germany)

    2006-02-01

    The aims of this study were to optimize image quality for indirect CT venography (sequential versus spiral), and to evaluate different image reconstruction parameters for patients with suspected deep venous thrombosis (DVT). Fifty-one patients (26/25 with/without DVT) were prospectively evaluated for pulmonary embolism (PE) with standard multidetector-row computed tomography (MDCT) protocols. Retrospective image reconstruction was done with different slice thicknesses and reconstruction increments in sequential and spiral modes. All reconstructions were read for depiction of DVT and to evaluate best reconstruction parameters in comparison with the thinnest reconstruction (''gold standard''). Image noise and venous enhancement were measured as objective criteria for image quality. Subjective image quality was rated on a four-point scale. Effective dose was estimated for all reconstructions. In sequential 10/50 reconstruction DVT was completely detected in 13/26 cases, partially in 10/26 cases and was not detected at all in 3/26 cases, and 15/26, 9/26 and 2/26 cases for the 10/20 reconstruction, respectively. DVT was completely detected in all spiral reconstructions. Image noise ranged between 14.8-29.1 HU. Median image quality was 2. Estimated effective dose ranged between 2.3 mSv and 11.8 mSv. Gaps in sequential protocols may lead to false negative results. Therefore, spiral scanning protocols for complete depiction of DVT are mandatory. (orig.)

  13. Xenon/CT blood flow mapping of the liver using multidetector-row computed tomography. Compensation of respiratory misregistration by volume data

    International Nuclear Information System (INIS)

    For improvement in the accuracy of xenon/CT blood flow mapping of the liver, this study was conducted to assess whether volume-data obtained by multidetector-row helical CT could compensate for the slice misregistration caused by inconstant breath depth. Using imaging phantoms scanned on both multidetector-row and single-detector CT, suitable parameters were decided. In the phantom studies, axial scan with multidetector-row CT showed significantly greater variance of CT value than that of single detector row CT (SDCT). On multidetector-row CT, variances of the CT values maintained in low (80 kV) tube voltage, which is advantageous for detecting subtle enhancement of the liver. Images reconstructed with 10-mm thickness showed smaller variance than those of 5-mm thickness on low-pitch helical scan. Remarkable helical artifacts were seen on the high-pitch helical scan. Following the phantom studies, 7 examinees were scanned using xenon/CT with a predetermined scan protocol (80 kV, collimation 5 mm, thickness 10 mm, low-pitch helical scan). In all cases, slice compensation was necessary and was successfully performed. The number of pixels which constituted blood flow map increased after the compensation. No patients showed any significant adverse effects. In conclusion, multidetector-row helical CT has the potential for providing accurate quantification of xenon/CT blood flow mapping of liver by compensating for respiratory misregistration. (author)

  14. Evaluation of angiogenesis in colorectal carcinoma with multidetector-row CT multislice perfusion imaging

    Energy Technology Data Exchange (ETDEWEB)

    Feng Shiting, E-mail: fst1977@163.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China); Sun Canhui, E-mail: canhuisun@sina.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China); Li Ziping, E-mail: liziping163@tom.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China); Mak, Henry Ka-Fung, E-mail: makkf@hkucc.hku.h [Department of Diagnostic Radiology, University of Hong Kong, Hong Kong (China); Peng Zhenpeng, E-mail: ppzhen@21cn.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China); Guo Huanyi, E-mail: guohuanyi@163.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China); Meng Quanfei, E-mail: mzycoco@gmail.co [Department of Radiology, First Affiliated Hospital of SunYat-sen University, Guangzhou 510080 (China)

    2010-08-15

    To evaluate the correlation between 64 multidetector-row CT (64MDCT) perfusion imaging in colorectal carcinoma and microvessel density (MVD) and vascular endothelial growth factor (VEGF), 64MDCT perfusion imaging was performed in 33 patients with pathologically verified colorectal carcinoma. These images were analyzed with perfusion functional software, and time-density curves (TDC) were created for the region of interest (ROI) encompassing the tumor, the target artery and vein. The individual perfusion maps generated indicated blood flow (BF), blood volume (BV), mean transit time (MTT), and permeability-surface area product (PS). MVD and VEGF were evaluated by immunohistochemical staining with anti-CD34 and anti-VEGF, respectively. Correlations between MVD or VEGF with CT perfusion parameters and clinicopathological factors (Dukes' stages, invasion depth, and lymph node and liver metastasis) were also investigated. MVD in the colorectal carcinoma was 22.61 {+-} 9.01 per x200 field. The scores obtained for VEGF expression were 4.15 {+-} 1.09. VEGF staining was positive in 25 of 29 tumors (86.2%). There was no significant correlation between the presence of MVD, VEGF expression and clinicopathological factors (P > 0.05). There was also no correlation between MVD, VEGF expression, and any dynamic CT parameters (P > 0.05). The BV and MTT were significantly higher in tumors demonstrating serous coat invasion than in those without it (t = -2.63, -2.24, P = 0.0137, 0.0331, respectively). BV was also significantly correlated with tumor size (r = 0.41, P = 0.02). Neither BF nor PS was correlated with clinicopathological factors. In conclusion, 64MDCT perfusion imaging, MVD, and VEGF may reflect angiogenic activity, but no significant correlation among these factors.

  15. Multi-detector row CT scanning in Paleoanthropology at various tube current settings and scanning mode.

    Science.gov (United States)

    Badawi-Fayad, J; Yazbeck, C; Balzeau, A; Nguyen, T H; Istoc, A; Grimaud-Hervé, D; Cabanis, E- A

    2005-12-01

    The purpose of this study was to determine the optimal tube current setting and scanning mode for hominid fossil skull scanning, using multi-detector row computed tomography (CT). Four fossil skulls (La Ferrassie 1, Abri Pataud 1, CroMagnon 2 and Cro-Magnon 3) were examined by using the CT scanner LightSpeed 16 (General Electric Medical Systems) with varying dose per section (160, 250, and 300 mAs) and scanning mode (helical and conventional). Image quality of two-dimensional (2D) multiplanar reconstructions, three-dimensional (3D) reconstructions and native images was assessed by four reviewers using a four-point grading scale. An ANOVA (analysis of variance) model was used to compare the mean score for each sequence and the overall mean score according to the levels of the scanning parameters. Compared with helical CT (mean score=12.03), the conventional technique showed sustained poor image quality (mean score=4.17). With the helical mode, we observed a better image quality at 300 mAs than at 160 in the 3D sequences (P=0.03). Whereas in native images, a reduction in the effective tube current induced no degradation in image quality (P=0.05). Our study suggests a standardized protocol for fossil scanning with a 16 x 0.625 detector configuration, a 10 mm beam collimation, a 0.562:1 acquisition mode, a 0.625/0.4 mm slice thickness/reconstruction interval, a pitch of 5.62, 120 kV and 300 mAs especially when a 3D study is required. PMID:16211320

  16. Carotid artery wall thickness: comparison between sonography and multi-detector row CT angiography

    Energy Technology Data Exchange (ETDEWEB)

    Saba, Luca [University of Cagliari, Department of Radiology, Policlinico Universitario, Cagliari (Italy); Sanfilippo, Roberto; Montisci, Roberto [Policlinico Universitario, Department of Vascular Surgery, Cagliari (Italy); Mallarini, Giorgio [University of Cagliari, Department of Radiology, Policlinico Universitario, Cagliari (Italy); Ospedale San Giovanni di Dio, Institute of Radiology, Cagliari (Italy)

    2010-02-15

    Prospective studies have shown that an increased thickness of the carotid wall is a significant predictor of coronary and cerebrovascular complications. Our purpose was to assess the agreement between multi-detector row computed tomography (CT) angiography (MDCTA) and colour Doppler ultrasound (CD-US) in measuring carotid artery wall thickness (CAWT) and the intima-media thickness (IMT). Altogether, 97 subjects (age range 64-84 years) were prospectively analysed using a four-detector row CT and a sonographic scanner. In total, 46 subjects had shown cerebral ischaemic symptoms. CAWT and IMT were measured in each patient using MDCTA and CD-US (by applying a digital calliper), respectively. Continuous data were described as the mean value {+-} standard deviation and were compared using the Mann-Whitney U test. A p value <0.05 was considered significant. Bland-Altman statistics was employed to measure the agreement between MDCTA and CD-US. CAWT ranged from 0.5 to 1.53 mm, with a mean value of 0.9072 mm. IMT ranged from 0.46 to 1.5 mm, with a mean value of 0.8839 mm. By analysing the Bland-Altman plot, we observed an excellent agreement between CD-US and MDCTA with a bias between methods of 0.023 {+-} 0.0424 mm. A limit of agreement from -0.06 to 0.106 was recorded. Correlation coefficient r was 0.9855 (95% confidence interval 0.9808-0.989). Mann-Whitney U test indicated a p value of 0.377. Obtained results indicated a significant agreement between MDCTA and CD-US in the measurement of CAWT and IMT. (orig.)

  17. Carotid artery wall thickness: comparison between sonography and multi-detector row CT angiography

    International Nuclear Information System (INIS)

    Prospective studies have shown that an increased thickness of the carotid wall is a significant predictor of coronary and cerebrovascular complications. Our purpose was to assess the agreement between multi-detector row computed tomography (CT) angiography (MDCTA) and colour Doppler ultrasound (CD-US) in measuring carotid artery wall thickness (CAWT) and the intima-media thickness (IMT). Altogether, 97 subjects (age range 64-84 years) were prospectively analysed using a four-detector row CT and a sonographic scanner. In total, 46 subjects had shown cerebral ischaemic symptoms. CAWT and IMT were measured in each patient using MDCTA and CD-US (by applying a digital calliper), respectively. Continuous data were described as the mean value ± standard deviation and were compared using the Mann-Whitney U test. A p value <0.05 was considered significant. Bland-Altman statistics was employed to measure the agreement between MDCTA and CD-US. CAWT ranged from 0.5 to 1.53 mm, with a mean value of 0.9072 mm. IMT ranged from 0.46 to 1.5 mm, with a mean value of 0.8839 mm. By analysing the Bland-Altman plot, we observed an excellent agreement between CD-US and MDCTA with a bias between methods of 0.023 ± 0.0424 mm. A limit of agreement from -0.06 to 0.106 was recorded. Correlation coefficient r was 0.9855 (95% confidence interval 0.9808-0.989). Mann-Whitney U test indicated a p value of 0.377. Obtained results indicated a significant agreement between MDCTA and CD-US in the measurement of CAWT and IMT. (orig.)

  18. The quality of reconstructed 3D images in multidetector-row helical CT: experimental study involving scan parameters

    International Nuclear Information System (INIS)

    To determine which multidetector-row helical CT scanning technique provides the best-quality reconstructed 3D images, and to assess differences in image quality according to the levels of the scanning parameters used. Four objects with different surfaces and contours were scanned using multidetector-row helical CT at three detector-row collimations (1.25, 2.50, 5.00 mm), two pitches (3.0, 6.0), and three different degrees of overlap between the reconstructed slices (0%, 25%, 50%). Reconstructed 3D images of the resulting 72 sets of data were produced using volumetric rendering. The 72 images were graded on a scale from 1 (worst) to 5 (best) for each of four rating criteria, giving a mean score for each criterion and an overall mean score. Statistical analysis was used to assess differences in image quality according to scanning parameter levels. The mean score for each rating criterion, and the overall mean score, varied significantly according to the scanning parameter levels used. With regard to detector-row collimation and pitch, all levels of scanning parameters gave rise to significant differences, while in the degree of overlap of reconstructed slices, there were significant differences between overlap of 0% and of 50% in all levels of scanning parameters, and between overlap of 25% and of 50% in overall accuracy and overall mean score. Among the 18 scanning sequences, the highest score (4.94) was achieved with 1.25 mm detector-row collimation, 3.0 pitch, and 50% overlap between reconstructed slices. Comparison of the quality of reconstructed 3D images obtained using multidetector-row helical CT and various scanning techniques indicated that the 1.25 mm, 3.0, 50% scanning sequence was best. Quality improved as detector-row collimation decreased; as pitch was reduced from 6.0 to 3.0; and as overlap between reconstructed slices increased

  19. Multi-detector row CT in the assessment of axillary lymph node metastasis in breast cancer

    International Nuclear Information System (INIS)

    The purpose of this study is to evaluate the diagnostic capability instead of clinical efficacy of multi-detector row CT (MDCT) in the assessment of axillary lymph node metastasis in breast cancer. MDCT was performed in 63 patients with breast cancer, and multiplanar reformation (MPR) and volume rendering (VR) images were reconstructed for the evaluation of bilateral axillary lymph nodes. Two hundred sixty eight lymph nodes were depicted with MDCT, and correlation with pathological findings was performed. The short axis length of lymph node was measured on MPR image, and the shape of the nodes was analyzed with the pathological results statistically. The diagnostic criteria on size and shape of lymph node metastasis were discussed Dynamic study with contrast media was also performed, and the CT value ratios (CTVR) of the lymph nodes and breast tumors were calculated. No relevance of axillary lymph node metastasis was noted to the pathological types of breast cancer. The average short axis length of the ipsilateral axillary nodes was 8.9 mm±3.8 (SD) while that of the contralateral nodes was 4.9 mm±1.1 (SD) showing significant difference. More than 6.5 mm in short length of the lymph node was thought to be an effective criterion for positive metastasis, and its sensitivity was 96%. Soybean-shape lymph node was statistically common in metastasis, while non-metastatic nodes were commonly demonstrated as letter ''c'' shape or ring-like shape. Statistical relevance was obtained between the CTVR of axillary lymph nodes and that of breast tumors, suggesting clinical usefulness of dynamic study using contrast media in the evaluation of lymph node metastasis. With MPR and VR images using MDCT, more accurate morphological evaluation of axillary lymph nodes was possible. When soybean-shape node with more than 6.5 mm in short axis is depicted in the axillar region on MDCT metastasis should be the consideration. Comparison with the contralateral side as a control in coronal

  20. A pictorial review of acute aortic syndrome: discriminating and overlapping features as revealed by ECG-gated multidetector-row CT angiography

    OpenAIRE

    Ueda, Takuya; Chin, Anne; Petrovitch, Ivan; Fleischmann, Dominik

    2012-01-01

    Background The term "acute aortic syndrome" (AAS) encompasses a spectrum of life-threatening conditions characterized by acute aortic pain. AAS traditionally embraces three abnormalities including classic aortic dissection, intramural haematoma, and penetrating atherosclerotic ulcer. Although the underlying etiologies and conditions predisposing to AAS are diverse, the clinical features are indistinguishable. Methods Multidetector-row computed tomography (CT) with electrocardiographic gating ...

  1. Dose-reduced 16-slice multidetector-row spiral computed tomography in children with bronchoscopically suspected vascular tracheal stenosis - initial results; Dosisreduzierte 16-Schicht-Multidetektor-Spiralcomputertomographie bei Saeuglingen und Kleinkindern mit bronchoskopischem Verdacht auf vaskulaer bedingte Trachealstenosen - erste klinische Ergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Honnef, D.; Wildberger, J.E.; Das, M.; Hohl, C.; Mahnken, A.; Guenther, R.W.; Staatz, G. [Universitaetsklinikum der RWTH Aachen (Germany). Klinik fuer Radiologische Diagnostik; Schnoering, H.; Vazquez-Jimenez, J. [Universitaetsklinikum der RWTH Aachen (Germany). Klinik fuer Kinderherzchirurgie

    2006-04-15

    Purpose: To evaluate the diagnostic accuracy of contrast-enhanced dose-reduced 16-slice multidetector-row CT (MDCT) in newborns and infants with fiberoptic bronchoscopically suspected vascular-induced tracheal stenosis. Materials and Methods: 12 children (4 days to 3 years, 1.2-13.5 kg body weight) were examined using i.v. contrast-enhanced 16-slice MDCT (SOMATOM Sensation 16, Forchheim, Germany) without breath-hold and under sedation (11/12). All MDCTs were performed with a dose reduction. The beam collimation was 16 x 0.75 mm, except in the case of one child. MPRs along the tracheal axis in the x-, y- and z-directions and volume-rendering-reconstructions (VRTs) were calculated based on a secondary raw data set in addition to conventional axial slices. 2 radiologists used a three-point grade scale to evaluate the image quality, motion, and contrast media artifacts as well as the usefulness of the 2D- and 3D-reconstructions for determining the diagnosis. Statistical analysis was performed on the basis of a Kappa test. Results: In all cases the cause of the fiberoptic bronchoscopically suspected tracheal stenosis was revealed: compression due to the brachiocephalic trunk (n=7), double aortic arch (n=2), lusorian artery (n=1), vascular compression of the left main bronchus (n=2). In 3 patients further thoracic anomalies, such as tracheobronchial (n=2), and vascular (n=2) and vertebral (n=1) anomalies were found. The attenuation in the anomalous vessels was 307{+-}140 HU. The image noise was 9.8{+-}1.9 HU. The mean dose reduction was 82.7{+-}3.2% compared to a standard adult thoracic CT. All examinations were rated as diagnostically good (median 1, range 1, k=1). 3D images did not show any stair artifacts (median 2, range 1-2, k=1). The image noise was minor to moderate and hardly any motion artifacts were seen (median 1, range 1-2, k=0.8). Contrast media artifacts were rated zero to minor (median 1.5, range 1-2, k=0.676). MPRs (median 1, range 1, k=1) and VRTs

  2. Accuracy of multidetector-row CT in diagnosing lymph node metastasis in patients with gastric cancer

    International Nuclear Information System (INIS)

    The purpose of this study was to determine the optimal cut-off value of lymph node size for diagnosing metastasis in gastric cancer with multidetector-row computed tomography (MDCT) after categorizing perigastric lymph nodes into three regions. The study included 90 gastric cancer patients who underwent gastrectomy. The long-axis diameter (LAD) and short-axis diameter (SAD) of all visualized lymph nodes were measured with transverse MDCT images. The locations of lymph nodes were categorized into three regions: lesser curvature, greater curvature, and suprapancreatic. The diagnostic value of lymph node metastasis was assessed with receiver operating characteristic (ROC) analysis. The area under the curve was larger for SAD than LAD in all groups. The optimal cut-off values of SAD were determined as follows: overall, 9 mm; differentiated type, 9 mm; undifferentiated type, 8 mm; lesser curvature region, 7 mm; greater curvature region, 6 mm; and suprapancreatic region, 9 mm. The diagnostic accuracies for lymph node metastasis using individual cut-off values were 71.1 % based on histological type and 76.6 % based on region of lymph node location. The diagnostic accuracy of lymph node metastasis in gastric cancer was improved by using individual cut-off values for each lymph node region. (orig.)

  3. Accuracy of multidetector-row CT in diagnosing lymph node metastasis in patients with gastric cancer

    Energy Technology Data Exchange (ETDEWEB)

    Saito, Takuro; Kurokawa, Yukinori; Takiguchi, Shuji; Miyazaki, Yasuhiro; Takahashi, Tsuyoshi; Yamasaki, Makoto; Miyata, Hiroshi; Nakajima, Kiyokazu; Mori, Masaki; Doki, Yuichiro [Osaka University, Graduate School of Medicine, Department of Gastroenterological Surgery, Suita, Osaka (Japan)

    2014-08-06

    The purpose of this study was to determine the optimal cut-off value of lymph node size for diagnosing metastasis in gastric cancer with multidetector-row computed tomography (MDCT) after categorizing perigastric lymph nodes into three regions. The study included 90 gastric cancer patients who underwent gastrectomy. The long-axis diameter (LAD) and short-axis diameter (SAD) of all visualized lymph nodes were measured with transverse MDCT images. The locations of lymph nodes were categorized into three regions: lesser curvature, greater curvature, and suprapancreatic. The diagnostic value of lymph node metastasis was assessed with receiver operating characteristic (ROC) analysis. The area under the curve was larger for SAD than LAD in all groups. The optimal cut-off values of SAD were determined as follows: overall, 9 mm; differentiated type, 9 mm; undifferentiated type, 8 mm; lesser curvature region, 7 mm; greater curvature region, 6 mm; and suprapancreatic region, 9 mm. The diagnostic accuracies for lymph node metastasis using individual cut-off values were 71.1 % based on histological type and 76.6 % based on region of lymph node location. The diagnostic accuracy of lymph node metastasis in gastric cancer was improved by using individual cut-off values for each lymph node region. (orig.)

  4. Volumetric Measurements of Lung Nodules with Multi-Detector Row CT: Effect of Changes in Lung Volume

    International Nuclear Information System (INIS)

    To evaluate how changes in lung volume affect volumetric measurements of lung nodules using a multi-detector row CT. Ten subjects with asthma or chronic bronchitis who had one or more lung nodules were included. For each subject, two sets of CT images were obtained at inspiration and at expiration. A total of 33 nodules (23 nodules ≥3 mm) were identified and their volume measured using a semiautomatic volume measurement program. Differences between nodule volume on inspiration and expiration were compared using the paired t-test. Percent differences, between on inspiration and expiration, in nodule attenuation, total lung volume, whole lung attenuation, and regional lung attenuation, were computed and compared with percent difference in nodule volume determined by linear correlation analysis. The difference in nodule volume observed between inspiration and expiration was significant (p < 0.01); the mean percent difference in lung nodule volume was 23.1% for all nodules and for nodules ≥3 mm. The volume of nodules was measured to be larger on expiration CT than on inspiration CT (28 out of 33 nodules; 19 out of 23 nodules ≥3 mm). A statistically significant correlation was found between the percent difference of lung nodule volume and lung volume or regional lung attenuation (p < 0.05) for nodules ≥3 mm. Volumetric measurements of pulmonary nodules were significantly affected by changes in lung volume. The variability in this respiration-related measurement should be considered to determine whether growth has occurred in a lung nodule

  5. The diagnostic accuracy of multidetector row CT for evaluating the axillary lymph nodes in patients with breast cancer

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Doo Kyung; Kim, Jun Man; Yim, Hyun Ee [Ajou University, College of Medicine, Suwon (Korea, Republic of)

    2007-08-15

    We investigated the CT (computed tomography) findings of metastatic lymph nodes (LNs), and we analyzed the diagnostic performance of multidetector row CT (MDCT) for detecting axillary LN metastases in patients with breast cancer. We investigated 59 patients who preoperatively underwent chest MDCT, and they underwent sentinel LN biopsy ro whole axillary LN dissection. We analyzed the morphologic features, the degree of enhancement and the delayed enhancement pattern. We classified the patients into the non-metastatic LN group and the metastatic LN group, and we calculated the diagnostic performance of MDCT for detecting metastatic LNs. When both the morphologic and quantitative criteria were consistent, the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were 58.1%, 100%, 100% and 68.3%, respectively, and MDCT accurately detected metastatic LNs in 2 patients that were false negative on sentinel LN biopsy. When the morphologic and quantitative criteria were consistent, the sensitivity, specificity, PPV and NPV were 87.1%, 53.6%, 67.5% and 78.9%, respectively. However, MDCT could not detect metastatic LNs, including two micrometastases (a total of 8 micrometastases) that were in each of four patients. MDCT can be used to perform the morphology and quantitative analysis of axillary LNs, and this modality has excellent specificity and a PPV for detecting metastatic LNs when the both of the diagnostic criteria are consistent.

  6. Tracheal compression due to an elongated aortic arch in patients with congenital heart disease: evaluation using multidetector-row CT

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    Watanabe, Noriko; Hayabuchi, Yasunobu; Inoue, Miki; Sakata, Miho; Nabo, Manal Mohamed Helmy; Nakagawa, Ryuji; Saijo, Takahiko; Kagami, Shoji [University of Tokushima, Department of Pediatrics, Tokushima (Japan)

    2009-10-15

    The airway can become obstructed as a result of compression by an elongated aortic arch. In this study we evaluated tracheal compression using multidetector-row CT in patients with congenital heart disease and an elongated aortic arch. The trachea was measured at the level of the aortic arch in 205 children and young adults and then the severity of tracheal compression was determined by measuring the tracheal diameter ratio (short axis diameter/long axis diameter). Patients were divided as follows: group I (normal aortic arch; n=166), group II (transversely running aortic arch; n=22), and group III (elongated aortic arch; n=17). From the viewpoint of the relationship of the great arteries, group II had D-malposition, and group III had L-malposition. Age, height, weight and body surface area were significantly correlated with the short and long axis diameter in group I. There was a negative correlation between tracheal diameter ratio and the physical size parameters. The tracheal diameter ratio in group III was 0.50{+-}0.13, which was significantly lower than in groups I and II (P<0.01 and 0.05, respectively). Even apparently asymptomatic patients with an elongated aortic arch can have tracheal compression. An elongated aortic arch may be a useful predictor of tracheal compression. (orig.)

  7. Detection and localization of acute upper and lower gastrointestinal (GI) bleeding with arterial phase multi-detector row helical CT

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    Jaeckle, T.; Stuber, G.; Hoffmann, M.H.K.; Jeltsch, M.; Schmitz, B.L.; Aschoff, A.J. [University Hospital of Ulm, Diagnostic and Interventional Radiology, Ulm (Germany)

    2008-07-15

    The purpose of this study was to evaluate the accuracy of multi-detector row helical CT (MDCT) for detection and localization of acute upper and lower gastrointestinal (GI) hemorrhage or intraperitoneal bleeding. Thirty-six consecutive patients with clinical signs of acute bleeding underwent biphasic (16- or 40-channel) MDCT. MDCT findings were correlated with endoscopy, angiography or surgery. Among the 36 patients evaluated, 26 were examined for GI bleeding and 10 for intraperitoneal hemorrhage. Confirmed sites of GI bleeding were the stomach (n = 5), duodenum (n = 5), small bowel (n = 6), large bowel (n = 8) and rectum (n = 2). The correct site of bleeding was identifiable on MDCT in 24/26 patients with GI bleeding. In 20 of these 24 patients, active CM extravasation was apparent during the exam. Among the ten patients with intraperitoneal hemorrhage, MDCT correctly identified the bleeding source in nine patients. Our findings suggest that fast and accurate localization of acute gastrointestinal and intraperitoneal bleeding is achievable on MDCT. (orig.)

  8. Detection and localization of acute upper and lower gastrointestinal (GI) bleeding with arterial phase multi-detector row helical CT

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate the accuracy of multi-detector row helical CT (MDCT) for detection and localization of acute upper and lower gastrointestinal (GI) hemorrhage or intraperitoneal bleeding. Thirty-six consecutive patients with clinical signs of acute bleeding underwent biphasic (16- or 40-channel) MDCT. MDCT findings were correlated with endoscopy, angiography or surgery. Among the 36 patients evaluated, 26 were examined for GI bleeding and 10 for intraperitoneal hemorrhage. Confirmed sites of GI bleeding were the stomach (n = 5), duodenum (n = 5), small bowel (n = 6), large bowel (n = 8) and rectum (n = 2). The correct site of bleeding was identifiable on MDCT in 24/26 patients with GI bleeding. In 20 of these 24 patients, active CM extravasation was apparent during the exam. Among the ten patients with intraperitoneal hemorrhage, MDCT correctly identified the bleeding source in nine patients. Our findings suggest that fast and accurate localization of acute gastrointestinal and intraperitoneal bleeding is achievable on MDCT. (orig.)

  9. Multidetector row computed tomography of acute pancreatitis: Utility of single portal phase CT scan in short-term follow up

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Yongwonn [Department of Radiology, Konkuk University Medical Center, 4-12, Hwayang-dong, Gwangjin-gu, Seoul 143-729 (Korea, Republic of); Park, Hee Sun, E-mail: heesun.park@gmail.com [Department of Radiology, Konkuk University Medical Center, 4-12, Hwayang-dong, Gwangjin-gu, Seoul 143-729 (Korea, Republic of); Kim, Young Jun; Jung, Sung Il; Jeon, Hae Jeong [Department of Radiology, Konkuk University Medical Center, 4-12, Hwayang-dong, Gwangjin-gu, Seoul 143-729 (Korea, Republic of)

    2012-08-15

    Objective: The purpose of this study is to evaluate the question of whether nonenhanced CT or contrast enhanced portal phase CT can replace multiphasic pancreas protocol CT in short term monitoring in patients with acute pancreatitis. Materials and methods: This retrospective study was approved by the Institutional Review Board. From April 2006 to May 2010, a total of 52 patients having acute pancreatitis who underwent initial dual phase multidetector row CT (unenhanced, arterial, and portal phase) at admission and a short term (within 30 days) follow up dual phase CT (mean interval 10.3 days, range 3-28 days) were included. Two abdominal radiologists performed an independent review of three sets of follow up CT images (nonenhanced scan, single portal phase scan, and dual phase scan). Interpretation of each image set was done with at least 2-week interval. Radiologists evaluated severity of acute pancreatitis with regard to pancreatic inflammation, pancreatic necrosis, and extrapancreatic complication, based on the modified CT severity index. Scores of each image set were compared using a paired t-test and interobserver agreement was evaluated using intraclass correlation coefficient statistics. Results: Mean scores of sum of CT severity index on nonenhanced scan, portal phase scan, and dual phase scan were 5.7, 6.6, and 6.5 for radiologist 1, and 5.0, 5.6, and 5.8 for radiologist 2, respectively. In both radiologists, contrast enhanced scan (portal phase scan and dual phase scan) showed significantly higher severity score compared with that of unenhanced scan (P < 0.05), while portal phase and dual phase scan showed no significant difference each other. The trend was similar regarding pancreatic inflammation and extrapancreatic complications, in which contrast enhanced scans showed significantly higher score compared with those of unenhanced scan, while no significant difference was observed between portal phase scan and dual phase scan. In pancreatic necrosis

  10. 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

  11. Are pancreatic calcifications specific for the diagnosis of chronic pancreatitis? A multidetector-row CT analysis

    Energy Technology Data Exchange (ETDEWEB)

    Campisi, A. [Department of Radiology, University of Palermo, via del Vespro 127, 90127 Palermo (Italy); Brancatelli, G. [Department of Radiology, University of Palermo, via del Vespro 127, 90127 Palermo (Italy); Department of Radiology, University of Pittsburgh School of Medicine, 200 Lothrop street, 15213, Pittsburgh, PA (United States); Radiology Unit, La Maddalena hospital, 90146, Palermo (Italy)], E-mail: gbranca@yahoo.com; Vullierme, M.-P.; Levy, P.; Ruzniewski, P. [Universite Paris 7 Denis Diderot, Paris, F-75018 (France); AP-HP, Hopital Beaujon, Department of Radiology, Clichy F-92100 (France); Vilgrain, V. [Universite Paris 7 Denis Diderot, Paris, F-75018 (France); AP-HP, Hopital Beaujon, Department of Radiology, Clichy F-92100 (France); INSERM, U773, Centre de recherche biomedicale Bichat-Beaujon, CRB3, Paris F-75018 (France)

    2009-09-15

    Aim: To retrospectively establish the most frequently encountered diagnoses in patients with pancreatic calcifications and to investigate whether the association of certain findings could be helpful for diagnosis. Materials and methods: One hundred and three patients were included in the study. The location and distribution of calcifications; presence, nature, and enhancement pattern of pancreatic lesions; pancreatic atrophy and ductal dilatation were recorded. Differences between patients with chronic pancreatitis and patients with other entities were compared by using Fisher's exact test. Results: Patients had chronic pancreatitis (n = 70), neuroendocrine tumours (n = 14), intraductal papillary mucinous neoplasm (n = 11), pancreatic adenocarcinoma (n = 4), serous cystadenoma (n = 4). Four CT findings had a specificity of over 60% for the diagnosis of chronic pancreatitis: parenchymal calcifications, intraductal calcifications, parenchymal atrophy, and cystic lesions. When at least two of these four criteria were used in combination, 54 of 70 (77%) patients with chronic pancreatitis could be identified, but only 17 of 33 (51%) patients with other diseases. When at least three of these four criteria were present, a specificity of 79% for the diagnosis of chronic pancreatitis was achieved. Conclusion: Certain findings are noted more often in chronic pancreatitis than in other pancreatic diseases. The presence of a combination of CT findings can suggest chronic pancreatitis and be helpful in diagnosis.

  12. How accurate is unenhanced multidetector-row CT (MDCT) for localization of renal calculi?

    Energy Technology Data Exchange (ETDEWEB)

    Goetschi, Stefan, E-mail: goetschi@gmx.net [Institute of Radiology, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland); Umbehr, Martin, E-mail: martin.umbehr@triemli.ch [Urology Clinic, Department of Surgery, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland); Ullrich, Stephan, E-mail: stephan.ullrich@triemli.ch [Institute of Radiology, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland); Glenck, Michael, E-mail: michael.glenck@triemli.ch [Institute of Radiology, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland); Suter, Stefan, E-mail: stefan.suter@triemli.ch [Urology Clinic, Department of Surgery, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland); Weishaupt, Dominik, E-mail: dominik.weishaupt@triemli.ch [Institute of Radiology, Triemli Hospital, Birmensdorferstrasse 497, 8063 Zuerich (Switzerland)

    2012-11-15

    Purpose: To investigate the correlation between unenhanced MDCT and intraoperative findings with regard to the exact anatomical location of renal calculi. Design, setting, and participants: Fifty-nine patients who underwent unenhanced MDCT for suspected urinary stone disease, and who underwent subsequent flexible ureterorenoscopy (URS) as treatment of nephrolithiasis were included in this retrospective study. All MDCT data sets were independently reviewed by three observers with different degrees of experience in reading CT. Each observer was asked to indicate presence and exact anatomical location of any calcification within pyelocaliceal system, renal papilla or renal cortex. Results were compared to intraoperative findings which have been defined as standard of reference. Calculi not described at surgery, but present on MDCT data were counted as renal cortex calcifications. Results: Overall 166 calculi in 59 kidneys have been detected on MDCT, 100 (60.2%) were located in the pyelocaliceal system and 66 (39.8%) in the renal parenchyma. Of the 100 pyelocaliceal calculi, 84 (84%) were correctly located on CT data sets by observer 1, 62 (62%) by observer 2, and 71 (71%) by observer 3. Sensitivity/specificity was 90-94% and 50-100% if only pyelocaliceal calculi measuring >4 mm in size were considered. For pyelocaliceal calculi {<=}4 mm in size diagnostic performance of MDCT was inferior. Conclusion: Compared to flexible URS, unenhanced MDCT is accurate for distinction between pyelocaliceal calculi and renal parenchyma calcifications if renal calculi are >4 mm in size. For smaller renal calculi, unenhanced MDCT is less accurate and distinction between a pyelocaliceal calculus and renal parenchyma calcification is difficult.

  13. How accurate is unenhanced multidetector-row CT (MDCT) for localization of renal calculi?

    International Nuclear Information System (INIS)

    Purpose: To investigate the correlation between unenhanced MDCT and intraoperative findings with regard to the exact anatomical location of renal calculi. Design, setting, and participants: Fifty-nine patients who underwent unenhanced MDCT for suspected urinary stone disease, and who underwent subsequent flexible ureterorenoscopy (URS) as treatment of nephrolithiasis were included in this retrospective study. All MDCT data sets were independently reviewed by three observers with different degrees of experience in reading CT. Each observer was asked to indicate presence and exact anatomical location of any calcification within pyelocaliceal system, renal papilla or renal cortex. Results were compared to intraoperative findings which have been defined as standard of reference. Calculi not described at surgery, but present on MDCT data were counted as renal cortex calcifications. Results: Overall 166 calculi in 59 kidneys have been detected on MDCT, 100 (60.2%) were located in the pyelocaliceal system and 66 (39.8%) in the renal parenchyma. Of the 100 pyelocaliceal calculi, 84 (84%) were correctly located on CT data sets by observer 1, 62 (62%) by observer 2, and 71 (71%) by observer 3. Sensitivity/specificity was 90–94% and 50–100% if only pyelocaliceal calculi measuring >4 mm in size were considered. For pyelocaliceal calculi ≤4 mm in size diagnostic performance of MDCT was inferior. Conclusion: Compared to flexible URS, unenhanced MDCT is accurate for distinction between pyelocaliceal calculi and renal parenchyma calcifications if renal calculi are >4 mm in size. For smaller renal calculi, unenhanced MDCT is less accurate and distinction between a pyelocaliceal calculus and renal parenchyma calcification is difficult.

  14. Estudio vascular renal por TC multidetector de 64 canales 64-Multidetector row CT for the Renal Vascular Study

    Directory of Open Access Journals (Sweden)

    Daniela Stoisa

    2009-03-01

    Full Text Available Objetivo: Mostrar las diversas variantes anatómicas vasculares tanto arteriales como venosas en el estudio angiográfico renal por tomografìa computada multidetector (TCMD de 64 canales, dada su implicancia en un eventual planeamiento quirúrgico. Material y métodos: Evaluamos retrospectivamente 26 estudios realizados con tomógrafo Philips Brilliance de 64 canales. Se obtuvieron secuencias sin contraste y postcontraste e.v. en fases arterial y venosa, administrado con bomba inyectora doble cabezal. Para una fase arterial apropiada se utilizó técnica de bolus track. Las imágenes fueron posteriormente procesadas en Workstation Philips Brilliance 190P en un tiempo promedio de 30 minutos y reconstruidas con técnicas MIP y volumétrica. Resultados: Dentro de las variantes anatómicas arteriales, encontramos: bifurcaciones prehiliares (n=3, arterias accesorias (n=4 y arterias polares (n=9. Dentro de las variantes venosas fueron halladas: venas renales múltiples (n=5, venas circumaórticas (n=2, retroaórticas (n=2 y vena tributaria lumbar prominente (n=1. Conclusión: El estudio vascular renal adquiere importancia en el planeamiento quirúrgico en casos de nefrectomías parciales, laparoscópicas y en el transplante renal. Esto otorga suma utilidad al estudio de TCMD de 64 canales por su eficacia diagnóstica, dada la alta calidad de las reconstrucciones obtenidas, llegando a igualar a la angiografía digital, sin ser un método invasivo.Purpose: To show the wide range of anatomical vascular variants, arterial and venous, that can be seen in the angiographic renal study using 64-multidetector-row computed tomography (64-MDCT, due to its importance in an eventual surgical planning. Material and Methods: We have evaluated retrospectively 26 studies that have been done using a 64 channels Philips Brilliance CT scanner. We have obtained non enhanced and both in arterial and venous enhanced sequences. For the injection of the contrast material we

  15. Effect of computer-aided detection as a second reader in multidetector-row CT colonography

    International Nuclear Information System (INIS)

    Our purpose was to assess the effect of computer-aided detection (CAD) on lesion detection as a second reader in computed tomographic colonography, and to compare the influence of CAD on the performance of readers with different levels of expertise. Fifty-two CT colonography patient data-sets (37 patients: 55 endoscopically confirmed polyps ≥0.5 cm, seven cancers; 15 patients: no abnormalities) were retrospectively reviewed by four radiologists (two expert, two nonexpert). After primary data evaluation, a second reading augmented with findings of CAD (polyp-enhanced view, Siemens) was performed. Sensitivities and reading time were calculated for each reader without CAD and supported by CAD findings. The sensitivity of expert readers was 91% each, and of nonexpert readers, 76% and 75%, respectively, for polyp detection. CAD increased the sensitivity of expert readers to 96% (P = 0.25) and 93% (P = 1), and that of nonexpert readers to 91% (P = 0.008) and 95% (P = 0.001), respectively. All four readers diagnosed 100% of cancers, but CAD alone only 43%. CAD increased reading time by 2.1 min (mean). CAD as a second reader significantly improves sensitivity for polyp detection in a high disease prevalence population for nonexpert readers. CAD causes a modest increase in reading time. CAD is of limited value in the detection of cancer. (orig.)

  16. Heart-rate-adapted image reconstruction in multidetector-row cardiac CT: influence of physiological and technical prerequisite on image quality

    International Nuclear Information System (INIS)

    The purpose of this study was to develop strategies for optimal image reconstruction in multidetector-row cardiac CT and to discuss the results in the context of individual heart rate, cardiac physiology, and technical prerequisite. Sixty-four patients underwent multidetector-row cardiac CT. Depending on the heart rate either a single-segmental reconstruction (SSR) or an adaptive two-segmental reconstruction (ASR) was applied. Image reconstruction was done either antegrade (a) or retrograde (r) in relation to the R-peak. Reconstruction of all data sets was performed at multiple time points within the t-wave/p-wave interval, differing from each other by 50 ms. In addition, each reconstruction was assigned to one of six reconstruction intervals (A-F), each corresponding to a specific event in the cardiac cycle. While no significant time points were found for absolute values, the following interval/reconstruction technique combinations provided significant better image quality: F/r at HR 65 bpm for all segments (p≤0.002). The results show that in order to achieve optimal image quality, image reconstruction has to be adjusted to each patient's ECG curve and heart rate individually. The moment of reconstruction should be determined as absolute rather than as relative distance from the previous R-peak. (orig.)

  17. Intravenous three-dimensional CT portography using multi-detector row CT in patients with hepatic cirrhosis. Evaluation of scan timing and image quality

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate the scan timing and image quality of intravenous three-dimensional (3D) CT portography using multi-detector row CT (MDCT) and to assess the influence of patients' body weight on enhancement of the portal vein (PV). One hundred nine patients with hepatic cirrhosis underwent triple-phase contrast enhanced CT using MDCT. The early, portal, and late phases were started at 30 sec, 60 sec, and 90 sec, respectively, after the beginning of intravenous injection of contrast medium (300 mgI/mL, 100 mL total). The CT value of the PV was assessed in the three phases: precontrast, portal phase, and late phase. 3D-portography of the MIP image was evaluated by three-point scale based on vessel visualization. The relationship between these data and body weight was investigated. The mean CT value of PV at 60 sec was 172.01±25.94 HU, which was significantly higher than that at 90 sec. Good or excellent 3D-CT portography was obtained in 97/109 patients (89%). Heavy patients tended to show less opacification of PV. Intravenous 3D-CT portography using MDCT at a 60 sec delay provided adequate PV images for patients with hepatic cirrhosis. Enhancement of PV was affected by patients' body weight. (author)

  18. Adult Moyamoya disease: 320-Multidetector row CT for evaluation of revascularization in STA–MCA bypasses surgery

    Energy Technology Data Exchange (ETDEWEB)

    Tian, Bing; Xu, Bing; Liu, Qi; Hao, Qiang; Lu, Jianping, E-mail: cjr.lujianping@vip.163.com

    2013-12-01

    Purpose: To evaluate the utility of 320-multidetector row whole-brain computed tomography perfusion (WBCTP) and whole-head subtracted dynamic angiography (WHSDCTA) for assessing the revascularization of blood flow after superficial temporal artery (STA) to middle cerebral artery (MCA) bypass surgery in adults with Moyamoya disease (MD) in the short and long term. Patients and methods: 320-multidetector row WBCTP and WHSDCTA were applied in 20 patients with MD before and after surgery (for an average of 3 days and 3 months). The bypass arteries were investigated using WHSDCTA and compared with DSA. The regions of interests (ROIs) in the surgical and mirror sides of the cerebral cortex were drawn on a Vitrea Workstation. Cerebral blood volume (CBV), time to peak (TTP), cerebral blood flow (CBF), mean transit time (MTT), and delay time were recorded. Preoperative and postoperative perfusion parameters in the MCA distribution were compared using the paired t-test. Results: WHSDCTA could clearly demonstrate 24 bypass arteries in 26 arteries for 20 patients, results which were in accordance with the results of digital subtraction angiography (DSA). When comparing preoperative values to those within 3 days after surgery, only TTP and delay time were significantly different (P < 0.05). Values of CBV, TTP, CBF, delay time, and MTT 3 months after surgery were significantly different (P < 0.05) from those of preoperative perfusion. Conclusion: These data suggest that 320-multidetector row WBCTP and WHSDCTA can be used to evaluate the revascularization of blood flow after STA–MCA bypass surgery in patients with MD in the short and long term.

  19. Adult Moyamoya disease: 320-Multidetector row CT for evaluation of revascularization in STA–MCA bypasses surgery

    International Nuclear Information System (INIS)

    Purpose: To evaluate the utility of 320-multidetector row whole-brain computed tomography perfusion (WBCTP) and whole-head subtracted dynamic angiography (WHSDCTA) for assessing the revascularization of blood flow after superficial temporal artery (STA) to middle cerebral artery (MCA) bypass surgery in adults with Moyamoya disease (MD) in the short and long term. Patients and methods: 320-multidetector row WBCTP and WHSDCTA were applied in 20 patients with MD before and after surgery (for an average of 3 days and 3 months). The bypass arteries were investigated using WHSDCTA and compared with DSA. The regions of interests (ROIs) in the surgical and mirror sides of the cerebral cortex were drawn on a Vitrea Workstation. Cerebral blood volume (CBV), time to peak (TTP), cerebral blood flow (CBF), mean transit time (MTT), and delay time were recorded. Preoperative and postoperative perfusion parameters in the MCA distribution were compared using the paired t-test. Results: WHSDCTA could clearly demonstrate 24 bypass arteries in 26 arteries for 20 patients, results which were in accordance with the results of digital subtraction angiography (DSA). When comparing preoperative values to those within 3 days after surgery, only TTP and delay time were significantly different (P < 0.05). Values of CBV, TTP, CBF, delay time, and MTT 3 months after surgery were significantly different (P < 0.05) from those of preoperative perfusion. Conclusion: These data suggest that 320-multidetector row WBCTP and WHSDCTA can be used to evaluate the revascularization of blood flow after STA–MCA bypass surgery in patients with MD in the short and long term

  20. Whole-body low-dose multidetector row-CT in the diagnosis of multiple myeloma: an alternative to conventional radiography

    International Nuclear Information System (INIS)

    Objective: The goal of this study was to establish the feasibility of a low-dose whole-body multidetector row-CT (MDCT) protocol in the diagnosis of multiple myeloma (MM), as an alternative to conventional X-ray imaging, which is currently still state-of-the-art in these patients, with emphasis on the comparison of image resolution on axial and multiplanar reformatted (MPR) scans and reduction of radiation dose. Material and methods: 100 patients with known MM, or monoclonal gammopathy of unknown significance (MGUS) underwent unenhanced whole-body MDCT on a 16-slice scanner in a randomised fashion, using a 16 x 1.5 mm collimation and four different energy parameters (40, 50, 60 and 70 mAs). Three different reconstruction algorithms were used in every patient (B40f, B50f and B60f kernel). CT scans were reviewed independently by two radiologists, with regard to correct classification into one of the three known MM stages, and recognition of fracture risk. Thereafter, axial and MPR images were evaluated in consensus by both readers, with respect to image resolution. Diagnosis of osteolytic lesions was performed on the basis of axial and multiplanar reformatted images, whereas the assessment of spinal misalignment and fracture was done only on MPR images. The distribution of image resolution categories (very good, good, sufficient, insufficient for diagnosis) was evaluated depending on following parameters: current time product, patient's weight, bone density and reconstruction algorithm. The effective radiation dose was determined with the aid of an anthropomorphic Alderson Rando-Phantom, using a tube current time product of 40 mAs, and then extrapolating it on all current time products applied in this study on a commercially available software program WinDose (Institute of Medical Physics, Erlangen, Germany). Results: In all 100 patients, image resolution was diagnostic, regardless of scanning parameters, enabling correct classification of multiple myeloma patients

  1. Whole-body low-dose multidetector row-CT in the diagnosis of multiple myeloma: an alternative to conventional radiography

    Energy Technology Data Exchange (ETDEWEB)

    Horger, Marius; Claussen, Claus D.; Bross-Bach, Ulrike; Vonthein, Reinhard; Trabold, Tobias; Heuschmid, Martin; Pfannenberg, Christina

    2005-05-01

    Objective: The goal of this study was to establish the feasibility of a low-dose whole-body multidetector row-CT (MDCT) protocol in the diagnosis of multiple myeloma (MM), as an alternative to conventional X-ray imaging, which is currently still state-of-the-art in these patients, with emphasis on the comparison of image resolution on axial and multiplanar reformatted (MPR) scans and reduction of radiation dose. Material and methods: 100 patients with known MM, or monoclonal gammopathy of unknown significance (MGUS) underwent unenhanced whole-body MDCT on a 16-slice scanner in a randomised fashion, using a 16 x 1.5 mm collimation and four different energy parameters (40, 50, 60 and 70 mAs). Three different reconstruction algorithms were used in every patient (B40f, B50f and B60f kernel). CT scans were reviewed independently by two radiologists, with regard to correct classification into one of the three known MM stages, and recognition of fracture risk. Thereafter, axial and MPR images were evaluated in consensus by both readers, with respect to image resolution. Diagnosis of osteolytic lesions was performed on the basis of axial and multiplanar reformatted images, whereas the assessment of spinal misalignment and fracture was done only on MPR images. The distribution of image resolution categories (very good, good, sufficient, insufficient for diagnosis) was evaluated depending on following parameters: current time product, patient's weight, bone density and reconstruction algorithm. The effective radiation dose was determined with the aid of an anthropomorphic Alderson Rando-Phantom, using a tube current time product of 40 mAs, and then extrapolating it on all current time products applied in this study on a commercially available software program WinDose (Institute of Medical Physics, Erlangen, Germany). Results: In all 100 patients, image resolution was diagnostic, regardless of scanning parameters, enabling correct classification of multiple myeloma

  2. Multidetector-Row CT Angiography of Cerebral Vasospasm after Aneurysmal Subarachnoid Hemorrhage: Comparison of Bone Subtraction and Standard CT Angiography with Digital Subtraction Angiography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Yong Hee; You, Jin Jong; Choi, Ho Cheol; Kim, Ji Eun [Dept. of Radiology, Gyeongsang National University Hospital, Jinju (Korea, Republic of); Choi, Dae Seob [Gyeongsang Institue of Health Science, Gyeongsang National University School of Medicine, Jinju (Korea, Republic of); Ryoo, Jae Wook [Dept. of Radiology, Samsung Seoul Hospital, Seoul (Korea, Republic of)

    2011-10-15

    To evaluate the usefulness of multidetector-row CT angiography (MDCTA) for the diagnosis of cerebral vasospasm after aneurysmal subarachnoid hemorrhage (SAH) by comparison of digital subtraction angiography (DSA) and to compare the bone subtraction CT angiography (BS-CTA) and standard CT angiography (S-CTA). Thirty-three patients who were treated with intraarterial nimodipine infusion for the cerebral vasospasm after aneurysmal SAH were evaluated with MDCTA and DSA. BS-CTA images were reconstructed from the S-CTA and unenhanced CT source images. A total of 207 vascular segments were evaluated. A four-step scale for the degree of stenosis was applied for each segment. With DSA as the standard images, BS-CTA and S-CTA images were comparied. On DSA, 56 segments (27%) presented vasospasm. Concordance between the DSA and S-CTA and between DSA and BS-CTA were 94.7% and 82.1%, respectively. Overestimation for the degree of stenosis was shown in 37 segments on BS-CTA and in 8 segments on S-CTA, but underestimated segments were only shown on S-CTA (n = 4). MDCTA with standard technique seems to be a useful imaging tool for the evaluation of the cerebral vasospasm after aneurysmal SAH. However, BS-CTA is not needed because of additional radiation and overestimation of the degree of stenosis.

  3. Evaluation of visibility of lumen of coronary stents by CT coronary angiography using multi-detector row CT in our hospital

    International Nuclear Information System (INIS)

    Many experiments of evaluation of coronary stents by CT coronary angiography (CTCA) using multi-detector row computed tomography (MDCT) are reported since the appearance of 16-row and 64-row CT. However, blooming artifact makes the assessment of lumen of coronary stent (LCS) difficult at present. The purpose of this study is to investigate the evaluation of visibility of LCS by CTCA. CTCA was performed in 25 patients who had previously undergone stent implantation scanned using 64-row CT, and images of 32 stents were obtained. All images were classified into 4 grades (4: excellent, 3: good, 2: fair, 1: poor) according to their visibility of LCS. We investigated the correlation of stent characteristics and backgrounds (diameter, material and thickness of strut, the period from stent implantation to CTCA, the location of stent, and whether calcification or not) with the grade of visibility. We found the conditions of good visibility of LCS were the diameter >3.5 mm (ratio of ≥grade 3 was 77.8%=14/18 stents), thin strut (<100 μm), and no calcification (ratio of ≥grade 3 was 87.5%=14/16 stents). We expected that CTCA using MDCT will be established useful examination of evaluation of LCS in future. (author)

  4. Three-dimensional CT angiographic assessment of pelvic and lower-extremity occlusive disease using single detector-row and multidetector-row CT scanners

    International Nuclear Information System (INIS)

    Three-dimensional CT angiography (3D-CTA) using a single detector-row CT (SDCT) scanner has become an important technique in the evaluation of the vascular system. A multidetector-row CT (MDCT) scanner, that is, a more advanced CT scanner which can acquire up to four channels of data simultaneously, has been recently introduced. With the use of this robust CT scanner, it is expected that more efficient 3D-CTAs will be obtained thanks to the superior temporal and spatial resolution provided by this technology. The purpose of this study was to assess the usefulness of 3D-CTA reconstructed from the data sets obtained using both SDCT and MDCT scanners, and to evaluate new software which was originally developed for the assessment of vascular wall pathology and vessel tortuosity. Twenty patients with pelvic arterial occlusive disease underwent 3D-CTA using a SDCT scanner. For stenoses and occlusions, 3D-CTA had a sensitivity of 93%, and a specificity of 89% as compared to digital subtraction angiography. Long anatomical range 3D-CT angiographic evaluations, from the pelvic artery to the lower legs, were performed in five patients with peripheral arterial occlusive disease using an MDCT scanner. All significant stenoses and occlusions were nicely depicted by the 3D-CTAs using the MDCT scanner. A new method for semiautomatically produced, curvedplanar reconstructed images along the vessel length based on a virtual CT endoscopic technique (CEV-CPR method) provided smoothly reformatted longitudinal images of the vessel. Using a new technique for assessing vessel tortuosity, we were able to quantitatively evaluate vessel tortuosity by calculating vessel curvature. In conclusion, 3D-CTA using SDCT and MDCT scanners and newly developed software provided useful qualitative and quantitative information concerning vascular pathology in patients with pelvic and lower-extremity occlusive disease. (author)

  5. Detection of the anatomic structure and pathology in animal lung specimens: comparison of micro CT and multi-detector row CT

    International Nuclear Information System (INIS)

    We wanted to compare the capability of micro CT and the clinically available thin-slice multi-detector row CT (MDCT) for demonstrating fine anatomic structures and pathological lesions in formalin-fixed lung specimens. The porcine lung with shark liver oil-induced lipoid pneumonia and the canine lung with pulmonary paragonimiasis were fixed by ventilating them with formalin vapor, and they were then sliced into one-centimeter thick sections. Micro CT (section thickness, 18 micrometer) and MDCT (section thickness, 0.75 mm) images were acquired in four of the lung slices of the lipoid pneumonia specimen and in five of the lung slices of the paragonimiasis specimen. On 62 pairs of micro CT and MDCT images, 169 pairs of rectangular ROIs were manually drawn in the corresponding locations. Two chest radiologists recorded the detectability of three kinds of anatomic structures (lobular core structure, interlobular septum and small bronchiolar lumen) and two kinds of pathological lesions (ground-glass opacity and consolidation) with using a five-point scale. The statistical comparison was performed by using the Wilcoxon signed rank test. Interobserver agreement was evaluated with kappa statistics. For all observers, all the kinds of anatomic structures and pathological lesions were detected better on the micro CT images than on the MDCT images (ρ < 0.01). Agreement was fair between two observers (κ = 0.38, ρ < 0.001). The fine anatomic structures and pathological lesions of the lung were more accurately demonstrated on micro CT than on thin-slice MDCT in the inflated and fixed lung specimens

  6. Detection of the anatomic structure and pathology in animal lung specimens: comparison of micro CT and multi-detector row CT

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Kun Young [National Cancer Center, Goyang (Korea, Republic of); Lee, Hyun Ju; Lee, Chang Hyun; Son, Kyu Ri; Goo, Jin Mo; Im, Jung Gi [Seoul National University Hospital and the Institute of Radiation Medicine, Seoul (Korea, Republic of); Seo, Joon Beom [Asan Medical Center, University of Ulsan College of Medicine, Seoul (Korea, Republic of)

    2006-05-15

    We wanted to compare the capability of micro CT and the clinically available thin-slice multi-detector row CT (MDCT) for demonstrating fine anatomic structures and pathological lesions in formalin-fixed lung specimens. The porcine lung with shark liver oil-induced lipoid pneumonia and the canine lung with pulmonary paragonimiasis were fixed by ventilating them with formalin vapor, and they were then sliced into one-centimeter thick sections. Micro CT (section thickness, 18 micrometer) and MDCT (section thickness, 0.75 mm) images were acquired in four of the lung slices of the lipoid pneumonia specimen and in five of the lung slices of the paragonimiasis specimen. On 62 pairs of micro CT and MDCT images, 169 pairs of rectangular ROIs were manually drawn in the corresponding locations. Two chest radiologists recorded the detectability of three kinds of anatomic structures (lobular core structure, interlobular septum and small bronchiolar lumen) and two kinds of pathological lesions (ground-glass opacity and consolidation) with using a five-point scale. The statistical comparison was performed by using the Wilcoxon signed rank test. Interobserver agreement was evaluated with kappa statistics. For all observers, all the kinds of anatomic structures and pathological lesions were detected better on the micro CT images than on the MDCT images ({rho} < 0.01). Agreement was fair between two observers ({kappa} = 0.38, {rho} < 0.001). The fine anatomic structures and pathological lesions of the lung were more accurately demonstrated on micro CT than on thin-slice MDCT in the inflated and fixed lung specimens.

  7. Differentiation of a Femoral Hernia from an Inguinal Hernia on Isotropic Multidetector-Row CT (MDCT): the Benefit of Inguinal Ligament Coronal-Oblique Images

    International Nuclear Information System (INIS)

    This study was designed to evaluate the diagnostic value of the use of inguinal ligament coronal-oblique CT images in the differentiation of femoral hernias from inguinal hernias. A total of 32 patients (with 11 femoral hernias and 21 inguinal hernias) underwent CT imaging. All of the examinations were performed with a 16- multidetector row CT (MDCT) scanner with contrast enhancement, and transverse sections, coronal sections and coronal-oblique CT images were reformed along an imaginary inguinal ligament plane. Two independent observers retrospectively evaluated the CT scans. Image analysis was first performed with only transverse and coronal images. A second analysis was then performed with transverse, coronal and coronal- oblique images. The mean angle difference between coronal and coronal-oblique CT images was 8.0 degrees (range, 0-22 degrees). A radiologist correctly diagnosed the presence of a femoral hernia in nine (82%) of 11 patients and a radiology fellow correctly diagnosed the presence of a femoral hernia in seven (64%) of 11 patients in the first session. Both of the reviewers made the correct diagnosis in all patients in the second session. For inguinal hernias, both reviewers correctly diagnosed all patients during both sessions. The coronal-oblique CT images were the most valuable images for the evaluation of the relationship between hernias of the neck and inguinal ligament. Inguinal ligament coronal-oblique CT images can provide additional diagnostic value in the evaluation of groin hernias

  8. Upper abdominal gadoxetic acid-enhanced and diffusion-weighted MRI for the detection of gastric cancer: Comparison with two-dimensional multidetector row CT

    International Nuclear Information System (INIS)

    Aim: To evaluate the diagnostic performance of abdominal magnetic resonance imaging (MRI) for the detection of gastric cancer in comparison with that of two-dimensional (2D) multidetector row computed tomography (CT). Materials and methods: The study included 189 patients with 170 surgically confirmed gastric cancers and 19 patients without gastric cancer, all of whom underwent gadoxetic acid-enhanced MRI with diffusion-weighted (DW) imaging, and multidetector contrast-enhanced abdominal CT imaging. Two observers independently analysed three sets of images (CT set, conventional MRI set, and combined conventional and DW MRI set). A five-point scale for likelihood of gastric cancer was used. Diagnostic accuracy, sensitivity, specificity, positive predictive value, and negative predictive value were evaluated. Quantitative [apparent diffusion coefficient (ADC) analyses with Mann–Whitney U-test were conducted for gastric cancers and the nearby normal gastric wall. Results: The diagnostic accuracy and sensitivity for detection of gastric cancer were significantly higher on combined conventional and DW MRI set (77.8–78.3%; 75.3–75.9%) than the CT imaging set (67.7–71.4%; 64.1–68.2%) or the conventional MRI set (72–73%; 68.8–70%; p < 0.01). In particular, for gastric cancers with pT2 and pT3, the combined conventional and DW MRI set (91.6–92.6%) yielded significantly higher sensitivity for detection of gastric cancer than did the CT imaging set (76.8–81.1%) by both observers (p < 0.01). The mean ADC of gastric cancer lesions (1 ± 0.23 × 10−3mm2/s) differed significantly from that of normal gastric wall (1.77 ± 0.25 × 10−3 mm2/s; p < 0.01). Conclusion: Abdominal MRI with DW imaging was more sensitive for the detection of gastric cancer than 2D-multidetector row CT or conventional MRI alone. - Highlights: • The sensitivity for detection of gastric cancer is high on abdominal MR imaging. • DW imaging is helpful for detection of

  9. Pathologic/high-resolution CT correlation of focal lung lesions 5 mm or less in diameter. Detection and identification by multidetector-row CT

    International Nuclear Information System (INIS)

    The purpose of this study was to clarify the limitations of multidetector-row CT (MDCT) in detecting focal lung lesions of 5 mm or less in diameter by pathologic/high-resolution CT (HRCT) correlation. Twenty-two patients who underwent both preoperative HRCT of the entire lobe using MDCT (MD-HRCT) and lobectomy for primary (n=21) or metastatic (n=1) lung tumor were studied. The author attempted to locate any focal lung lesions other than the main tumor throughout the resected and sliced specimens and to identify the opacities corresponding to the macroscopic lesions on MD-HRCT before histopathologic evaluation. Then two observers without pathologic information attempted to detect the lesions on MD-HRCT. Ninety-one lesions of 5 mm or less in diameter were found in 15 patients. Histopathologically, 13 lesions were classified as bronchioloalveolar carcinoma (BAC), 38 as atypical adenomatous hyperplasia (AAH), 9 as reactive hyperplasia (RH), 19 as inflammatory lesion (INF), 8 as solid lesion (SL), and 4 as showing no organizing change. The author, who had knowledge of the gross pathologic examinations, identified the opacities at rates of 100%, 82%, 56%, 42%, and 88% for BAC, AAH, RH, INF, and SL, respectively. The rates of lesion detection in the absence of knowledge of the pathologic examinations were 85%, 58%, 22%, 32%, and 75% for BAC, AAH, RH, INF, and SL, respectively. The rates of identification and detection of lesions more than 3 mm in diameter were 90% and 57%, respectively, while those of lesions less than 2 mm in diameter were 71% and 35%, respectively. MD-HRCT proved to be useful in detecting focal lung lesions of 5 mm or less in diameter; however, it is still difficult to detect lesions of less than 2 mm in diameter. (author)

  10. Coronal multiplanar reconstruction view from isotropic voxel data sets obtained with multidetector-row CT. Assessment of detection and size of mediastinal and hilar lymph nodes

    International Nuclear Information System (INIS)

    To assess the detection and size of mediastinal and hilar lymph nodes by multiplanar reconstruction (MPR) view from isotropic voxel data sets obtained with multidetector-row computed tomography (MDCT). Thin-section CT of 27 patients with mediastinal or hilar lymph node swelling was obtained with a 25.6-cm field of view (FOV), 512 x 512 matrix, and two protocols: 0.5-mm collimation, 0.3-mm interval (Set A), and 2-mm collimation, 1-mm interval (Set B). MPR views with a 0.5-mm slice thickness were obtained from these two data sets. Postcontrast axial CT used 5-mm collimation (set C). Two observers evaluated the presence and cranio-caudal length of swollen lymph nodes. Two other board-certified chest radiologists evaluated all three sets and established a gold standard by consensus. The accuracy of detection was 76%, 73%, and 68% for sets A, B, and C, respectively. There was a significant difference between sets A and C (McNemar's test: p0.05). The cranio-caudal length of lymph nodes was significantly correlated with the gold standard only in set A (Pearson's correlation coefficient: r=0.53, p<0.05). Non-contrast enhanced coronal MPR views constructed from isotropic voxel data sets may be substituted for axial enhanced CT for the evaluation of mediastinal and hilar lymph nodes. (author)

  11. Evaluation of time-related changes in lung detail findings after radiation therapy to the chest using multidetector-row CT. Usefulness of precision scanning

    International Nuclear Information System (INIS)

    Time-related changes in lung detail findings after radiation therapy to the chest were evaluated using multidetector-row CT. The frequency of individual findings and time-related changes in percent incidence of findings were compared between ordinary scanning at 3 mm raw thickness and 8 mm recon thickness, and precision scanning set at 0.5 mm for both parameters. For both scanning methods, the most frequently detected finding was ground-glass opacity (GGO). For all findings other than GGO and consolidation, the frequency of detection was greater with precision scanning than with ordinary scanning. GGO was also the finding showing the greatest difference in frequency of detection between the two scanning methods; because ordinary scanning tended to overvalue GGO, a demonstrative experiment was conducted using a lung detail phantom. Regarding time-related changes in percent incidence of findings, precision scanning was equivalent or superior to ordinary scanning at all time points except after 3 months. These results, combined with the more accurate evaluation of various lung detail changes after radiation therapy to the chest, including GGO (reversible lesion), suggest the usefulness of precision scanning in combination with ordinary scanning. (author)

  12. 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.

  13. Evaluation of image quality and spatial resolution of low-dose high-pitch multidetector-row helical high-resolution CT in 11 autopsy lungs and a wire phantom

    International Nuclear Information System (INIS)

    The aim of this study was to evaluate whether low-dose high-pitch (6:1) multidetector-row helical high-resolution CT is appropriate for the evaluation of various pulmonary abnormalities, including faint opacities. Eleven autopsy lungs were scanned with a multidetector-row CT scanner using 2.5 mm x 4 beam collimation, effective slice thickness 3 mm, 6:1 pitch, 0.8 second gantry rotation speed, 20 cm Display Fov, high spatial frequency (bone) algorithm, and various radiation doses (120 kVp; 160, 80, 40, 24, and 8 mAs). The image quality of each CT set was assessed as adequate or inadequate for diagnosis by two independent observers. In addition, a wire phantom was scanned with the same parameters in order to describe the modular transfer function (MTF) curves. There was excellent agreement between the observers for the evaluation of image quality (kappa statistic, 0.84). The ratio of images evaluated as inadequate for 8 mAs and 24 mAs was significantly higher than that for 160, 80, and 40 mAs (p<0.01: chi-square test). MTF curves of both 8 and 24 mAs were significantly inferior to those of 40, 80, and 160 mAs (p<0.01, Friedman test), while the MTF curve of 40 mAs was relatively inferior to that of 160 mAs (p<0.05, Friedman test). More than 40 mAs in combination with 120 kVp is preferable for the evaluation of details of lung parenchyma by high-pitch. multidetector-row helical high-resolution CT. (author)

  14. Evaluation of image quality and spatial resolution of low-dose high-pitch multidetector-row helical high-resolution CT in 11 autopsy lungs and a wire phantom

    Energy Technology Data Exchange (ETDEWEB)

    Johkoh, Takeshi; Honda, Osamu; Yamamoto, Shuji [Osaka Univ., Suita (Japan). Medical School] (and others)

    2001-12-01

    The aim of this study was to evaluate whether low-dose high-pitch (6:1) multidetector-row helical high-resolution CT is appropriate for the evaluation of various pulmonary abnormalities, including faint opacities. Eleven autopsy lungs were scanned with a multidetector-row CT scanner using 2.5 mm x 4 beam collimation, effective slice thickness 3 mm, 6:1 pitch, 0.8 second gantry rotation speed, 20 cm Display Fov, high spatial frequency (bone) algorithm, and various radiation doses (120 kVp; 160, 80, 40, 24, and 8 mAs). The image quality of each CT set was assessed as adequate or inadequate for diagnosis by two independent observers. In addition, a wire phantom was scanned with the same parameters in order to describe the modular transfer function (MTF) curves. There was excellent agreement between the observers for the evaluation of image quality (kappa statistic, 0.84). The ratio of images evaluated as inadequate for 8 mAs and 24 mAs was significantly higher than that for 160, 80, and 40 mAs (p<0.01: chi-square test). MTF curves of both 8 and 24 mAs were significantly inferior to those of 40, 80, and 160 mAs (p<0.01, Friedman test), while the MTF curve of 40 mAs was relatively inferior to that of 160 mAs (p<0.05, Friedman test). More than 40 mAs in combination with 120 kVp is preferable for the evaluation of details of lung parenchyma by high-pitch. multidetector-row helical high-resolution CT. (author)

  15. Intra-individual comparison of patient acceptability of multidetector-row CT colonography and double-contrast barium enema

    International Nuclear Information System (INIS)

    AIMS: To compare the subjective acceptability of CT colonography in comparison with barium enema in older symptomatic patients, and to ascertain preferences for future colonic investigation. MATERIALS AND METHODS: The study population comprised 78 persons aged 60 years or over with symptoms suggestive of colorectal neoplasia, who underwent CT colonography followed the same day by barium enema. A 25-point questionnaire was administered after each procedure and an additional follow-up questionnaire a week later. Responses were compared using Wilcoxon matched pairs testing, Mann-Whitney test statistics and binomial exact testing. RESULTS: Participants suffered less physical discomfort during CT colonography (p=0.03) and overall satisfaction was greater compared with barium enema (p=0.03). On follow-up, respondents reported significantly better tolerance of CT colonography (p=0.002), and were less prepared to undergo barium enema again (p<0.001). Of 52 subjects expressing an opinion, all preferred CT to barium enema. CONCLUSION: Patient satisfaction was higher with CT colonography than barium enema. CT colonography caused significantly less physical discomfort and was overwhelmingly preferred by patients

  16. Cardiac multidetector row CT before percutaneous coronary intervention as a treatment guide for chronic total occlusion cardiac multidetector row CT before percutaneous coronary intervention as a treatment guide for chronic total occlusion

    International Nuclear Information System (INIS)

    The goal of this study was to investigate imaging results from a coronary CT angiography (CCTA) in chronic coronary total occlusion (CTO) before percutaneous coronary intervention (PCI). In 74 patients with CTO, 34 patients was evaluated by using a 64-row multidetector CT scanner prior to the PCI and 40 control subjects with CTO, who only took PCI, were included. The multiplanar reformation of the heart chambers and three-dimensional CT images were used for determining an optimal view. We analyzed and evaluated the success rates of PCI, length of occluded vessel, calcified plaques, occluded side-branches, tapered occlusion, > 45 degrees angulation of occluded artery, and myocardial density < 50 Hounsfield unit (HU). Success rates of PCI in the two groups, the control group and the experimental group, were not statistically different (p > 0.05). The mean length of occluded arteries was measured as 25 +/- 11 mm and 26 cases (74%) had an occlusion length > 2 cm. Calcified plaques proximal to occlusion were detected in 19 cases (54%). Occluded side branches, tapered occlusion, > 45 degrees angulation of occluded artery, and myocardial density < 50 HU were in 11 cases (32%), 9 cases (27%), 6 cases (18%), and 5 cases (15%), respectively. Although there was no correlation between the CCTA findings before PCI and the success rate of PCI, common findings of CCTA in CTO included an occlusion length > 2 cm and calcified plaques proximal to occluded arteries.

  17. Cardiac multidetector row CT before percutaneous coronary intervention as a treatment guide for chronic total occlusion cardiac multidetector row CT before percutaneous coronary intervention as a treatment guide for chronic total occlusion

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Dong Hun; Choi, Dong Hyun [Dept. of Radiology, Chosun University Hospital, Gwangju (Korea, Republic of); Lee, Nae Hee [Dept. of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of)

    2015-03-15

    The goal of this study was to investigate imaging results from a coronary CT angiography (CCTA) in chronic coronary total occlusion (CTO) before percutaneous coronary intervention (PCI). In 74 patients with CTO, 34 patients was evaluated by using a 64-row multidetector CT scanner prior to the PCI and 40 control subjects with CTO, who only took PCI, were included. The multiplanar reformation of the heart chambers and three-dimensional CT images were used for determining an optimal view. We analyzed and evaluated the success rates of PCI, length of occluded vessel, calcified plaques, occluded side-branches, tapered occlusion, > 45 degrees angulation of occluded artery, and myocardial density < 50 Hounsfield unit (HU). Success rates of PCI in the two groups, the control group and the experimental group, were not statistically different (p > 0.05). The mean length of occluded arteries was measured as 25 +/- 11 mm and 26 cases (74%) had an occlusion length > 2 cm. Calcified plaques proximal to occlusion were detected in 19 cases (54%). Occluded side branches, tapered occlusion, > 45 degrees angulation of occluded artery, and myocardial density < 50 HU were in 11 cases (32%), 9 cases (27%), 6 cases (18%), and 5 cases (15%), respectively. Although there was no correlation between the CCTA findings before PCI and the success rate of PCI, common findings of CCTA in CTO included an occlusion length > 2 cm and calcified plaques proximal to occluded arteries.

  18. Detection of hepatocelluar carcinoma on triple-phase images of liver using multi-detector row helical CT

    International Nuclear Information System (INIS)

    To determine whether triple-phase multi-detector-row helical CT images of liver improves the detection rate of hepatocellular carcinoma (HCC). Forty-one patients with 103 HCCs underwent triple-detector-row helical CT imaging of the entire liver after contrast administration. Early and late arterial phase images were obtained serially during a single breath-hold, and portal venous-phase images were then obtained. Each image set was independently assessed for the presence of HCC by two radiologists unaware of the possible presence of tumors, and for each phase the detection rate was determined. For each arterial-phase image, lesion conspicuity (attenuation of a tumor compared with that of its parenchyma) was calculated. For reader 1, the detection rates for the early arterial, late arterial, and portal venous phase were 81%, 77%, and 55%, respectively, and for reader 2 were 83%, 81% and 68%, respectively (p>0.05). When triple-phase imaging findings were combined, the detection rate was significantly higher than when only those of the early or late arterial, and portal venous, phase were used (p0.05). Triple-phase imaging of the liver, involving the early arterial, late arterial, and portal venous phase, and using multi-detector-row helical CT, increases the detection rate of HCC

  19. Impaired left ventricular function has a detrimental effect on image quality in multi-detector row CT coronary angiography

    International Nuclear Information System (INIS)

    Aim: To determine whether there is a relationship between left ventricular (LV) haemodynamic parameters, circulation times, and arterial contrast opacification that might affect the image quality of computed tomography (CT) coronary angiography. Methods: Thirty-six patients were included in the study: 18 with cardiomyopathy (CM) and LV dilatation of suspected ischaemic aetiology [age 57.9 ± 13.7 years, range 30-77 years; 14 male, four female; body mass index (BMI) = 27.7 ± 4.5, range 25.5-31.8] and 18 controls (age 62.3 ± 9.4 years, range 47-89 years; 10 male, eight female; BMI 27.8 ± 6.6; range 19.2-33.6). Coronary artery image quality was assessed using a three-point visual scale; contrast medium circulation times, aortic root contrast attenuation, and LV functional parameters were studied. Results: Visually reduced contrast opacification impaired image quality more often in the CM group than the control group (27.4 versus 5.1%). A total of 55.6% CM patients had a contrast transit time ranging from 30-75 s; the number of 'unassessable' segments increased with increasing transit time conforming to a fitted quadratic model (R2 = 0.74). The relationship between LV ejection fraction and contrast attenuation may also conform to a quadratic model (R2 = 0.71). Conclusion: LV haemodynamics influence coronary artery opacification using cardiac CT, and users imaging this subgroup must do so with the knowledge of this potential pitfall. The results indicate the need for further studies examining CT protocols in this clinical subgroup

  20. Accuracy of hydro-multidetector row CT in the local T staging of oesophageal cancer compared to postoperative histopathological results

    International Nuclear Information System (INIS)

    To evaluate the accuracy of multidetector computed tomography with water filling (Hydro-MDCT) in the T-staging of patients with oesophageal cancer. There were 131 consecutive patients who were preoperatively and prospectively examined in the prone position on arterial phase contrast-enhanced MDCT, after ingestion of 1,000-1,500 ml tap water and effervescent granules. Two readers staged the local tumour growth (T-staging) independently. They assessed tumour location, size, presence of stenosis, and morphology of the outer border of the oesophageal wall and perioesophageal fat planes on CT. CT findings were compared with histopathological results from resected specimens. Data were analyzed using the SPSS statistical package. Both readers obtained a high sensitivity of 95% and a high positive predictive value of 96%. Accurate local staging was achieved in 76.3% and 68.7% for readers 1 and 2, respectively. Inter-reader agreement was excellent (weighted κ value of 0.93 and un-weighted κ of 0.89). Using the hydro-technique and applying specific assessment criteria, MDCT appears to be an accurate, non-invasive diagnostic tool for local tumour staging of oesophageal cancer. (orig.)

  1. Coronary artery anomalies: Assessment with electrocardiography-gate multidetector-row CT at a single center in Korea

    Energy Technology Data Exchange (ETDEWEB)

    Yi, Bo Ram; Sun, Joo Sung; Yang, Hyoung Mo; Kang, Doo Kyoung [Ajou University School of Medicine, Suwon (Korea, Republic of)

    2015-04-15

    To determine the prevalence of coronary anomalies using coronary computed tomography angiography (CCTA) and to evaluate the relationship between coronary artery anomalies and chest pain. A total of 12676 patients underwent CCTA scans at our institution between December 2006 and April 2013 using a 64-slice CT and a 128-slice dual-source CT. We determined the prevalence of coronary artery anomalies according to the classification system proposed by Greenberg. The presence or absence of chest pain with each coronary artery anomaly was also evaluated. Coronary anomalies were found in 176 patients (1.39%) at our institute. Anomalies of origination, course, and termination were detected in 118 (0.93%), 28 (0.22%), and 30 (0.24%) patients, respectively. After the exclusion of 32 patients with combined heart disease, typical (n = 16; 11.1%) or atypical (n = 28; 19.4%) chest pain was present in 44 (30.6%) of the 144 patients at the time of diagnosis. The prevalence of coronary artery anomalies was 1.39% at our hospital. After the exclusion of patients with combined heart disease, 11.1% had typical chest pain at the time of diagnosis.

  2. Depiction of variants of the portal confluence venous system using multidetector row CT. Analysis of 916 cases

    Energy Technology Data Exchange (ETDEWEB)

    Krumm, P.; Schraml, C.; Bretschneider, C.; Seeger, A.; Klumpp, B.; Kramer, U.; Claussen, C.D.; Miller, S. [Universitaetsklinikum Tuebingen (Germany). Abt. fuer Diagnostische und Interventionelle Radiologie

    2011-12-15

    Purpose: Detailed knowledge of the venous mesenteric system is important for gastrointestinal surgery, particularly for transplantation planning and surgery and for the comprehension of perioperative complications that may influence patient outcome. Data about the mesenteric venous anatomy in the literature varies substantially. The purpose of this study was to categorize venous mesenteric variants and to determine their incidence. Materials and Methods: We included 916 patients requiring diagnostic abdominal CT in the portal venous phase. The mesenteric vein anatomy was categorized as follows: 1. the inferior mesenteric vein (IMV) enters the splenic vein (SV); 2. the IMV enters into the angle of the confluence of the SV and superior mesenteric vein (SMV) forming the portal vein (PV); 3. the IMV enters the SMV; 4. seven rare variants. We measured the diameters of the veins and distances from the confluence to the IMV origins. Results: The frequency of variants was: 1. 37.6 %, 2. 28.8 %; 3. 19.2 %. The rare variants totaled 14.4 %. The average vessel diameters measured in cm: PV 1.48; SV 1.02; SMV 1.2; IMV 0.5. The mean IMV entering distances were 1.66 cm in variant 1 and 0.75 cm in variant 3. Conclusion: The three common variants (1, 2 and 3) are the most relevant ones. 14.4 % of patients had different anatomic variants. The variability of the mesenteric venous system was higher than previously published. Knowledge of rare variants is important to avoid complications in abdominal surgery. (orig.)

  3. Evaluation of middle cerebral artery stents using multidetector row CT angiography in vivo study: comparison of the three different kernels

    International Nuclear Information System (INIS)

    Background: There are very few reports assessing middle cerebral artery (MCA) stents using multidetector computed tomography (MDCT). Purpose: To assess MCA stents using multidetector CT angiography (CTA) in vivo evaluation: the differences in the CTA results according to the three different kernels. Material and Methods: We retrospectively evaluated 27 MCA stents from 26 patients who underwent CTA with 16- and 64-slice MDCT after percutaneous transluminal angioplasty and stenting (PTAS). By CTA, using medium-smooth kernel (B30), medium-sharp kernel (B50), and sharp kernel (B60), the lumen diameter, artificial luminal narrowing (ALN), and subjective visibility score of the stented vessels were evaluated. The subjective visibility score ranged from 1 (poor quality) to 5 (excellent) using a five-point scale. Results: There were excellent inter-observer agreements for the lumen diameter measurements (P < 0.001). The mean diameter of the stented vessels was 2.10 ± 0.31 mm on digital subtraction angiography (DSA), 0.93 ± 0.20 mm on CTA using B30, 1.18 ± 0.27 mm on CTA using B50, and 1.29 ± 0.29 mm on CTA using B60. The mean ALN was 55.7 ± 6.0% on CTA using B30, 43.8 ± 7.5% on CTA using B50, and 38.7 ± 8.3% on CTA using B60. CTA with higher kernels had a smaller ALN than images with smaller kernels. The median subjective visibility score on the CTA using B50 was 3, which was higher than for the other kernels. The differences in the lumen diameter, ALN, and the subjective visibility score of the stented vessels on CTA using the three different kernels was statistically significant (P < 0.001). Conclusion: The sharp kernel was better to assess the lumen diameter and ALN, but was inferior to the medium-sharp kernel for in-stent evaluation due to high image-to-noise. CTA with medium-sharp kernel showed good lumen visibility and acceptable ALN for MCA stents. This could therefore be a non-invasive, readily applicable clinical method for assessing MCA stent patency after

  4. Evaluation of middle cerebral artery stents using multidetector row CT angiography in vivo study: comparison of the three different kernels

    Energy Technology Data Exchange (ETDEWEB)

    Jang, Jin Hee; Lim, Yeon Soo; Lee, Youn Joo; Yoo, Won Jong; Sung, Mi Sook (Dept. of Radiology, Bucheon St Mary' s Hospital, Coll. of Medicine, The Catholic Univ. of Korea, Bucheon (Korea, Republic of)), email: wjyu@catholic.ac.kr; Kim, Bum Soo (Dept. of Radiology, Seoul St Mary' s Hospital, Coll. of Medicine, The Catholic Univ. of Korea, Seoul (Korea, Republic of))

    2012-05-15

    Background: There are very few reports assessing middle cerebral artery (MCA) stents using multidetector computed tomography (MDCT). Purpose: To assess MCA stents using multidetector CT angiography (CTA) in vivo evaluation: the differences in the CTA results according to the three different kernels. Material and Methods: We retrospectively evaluated 27 MCA stents from 26 patients who underwent CTA with 16- and 64-slice MDCT after percutaneous transluminal angioplasty and stenting (PTAS). By CTA, using medium-smooth kernel (B30), medium-sharp kernel (B50), and sharp kernel (B60), the lumen diameter, artificial luminal narrowing (ALN), and subjective visibility score of the stented vessels were evaluated. The subjective visibility score ranged from 1 (poor quality) to 5 (excellent) using a five-point scale. Results: There were excellent inter-observer agreements for the lumen diameter measurements (P < 0.001). The mean diameter of the stented vessels was 2.10 +- 0.31 mm on digital subtraction angiography (DSA), 0.93 +- 0.20 mm on CTA using B30, 1.18 +- 0.27 mm on CTA using B50, and 1.29 +- 0.29 mm on CTA using B60. The mean ALN was 55.7 +- 6.0% on CTA using B30, 43.8 +- 7.5% on CTA using B50, and 38.7 +- 8.3% on CTA using B60. CTA with higher kernels had a smaller ALN than images with smaller kernels. The median subjective visibility score on the CTA using B50 was 3, which was higher than for the other kernels. The differences in the lumen diameter, ALN, and the subjective visibility score of the stented vessels on CTA using the three different kernels was statistically significant (P < 0.001). Conclusion: The sharp kernel was better to assess the lumen diameter and ALN, but was inferior to the medium-sharp kernel for in-stent evaluation due to high image-to-noise. CTA with medium-sharp kernel showed good lumen visibility and acceptable ALN for MCA stents. This could therefore be a non-invasive, readily applicable clinical method for assessing MCA stent patency after

  5. Radiological emergency room management with emphasis on multidetector-row

    International Nuclear Information System (INIS)

    Trauma is the fifth leading cause of death after disease of the cardiovascular system, malignomas and disease of the respiratory and digestive system. The management of severely injured patients, including radiological imaging, is a matter of ongoing development. In particular, as for the imaging modalities, multidetector-row CT represents a substantial refinement in the diagnostic work-up of multitrauma patients. Sufficient therapy within the first hour after trauma increases the patient's chances for survival significantly. Thus, therapeutic procedures and diagnostic evaluation have to be concomitant events, performed by a multidisciplinary team, namely trauma surgeon, anesthesiologist and, last but not least, radiologist. The increased performance of multidetector-row CT leads to increased spatial resolution, which is a prerequisite for sophisticated two- and three-dimensional postprocessing. The increased volume coverage speed allows for comprehensive whole-body CT at still high levels of spatial resolution, resulting in significant spare of time which influences patient's survival. Using this technique conventional imaging such as plane film or angiography may be omitted

  6. Chronic thromboembolic pulmonary hypertension (CTEPH). Potential role of multidetector-row CT (MD-CT) and MR imaging in the diagnosis and differential diagnosis of the disease

    Energy Technology Data Exchange (ETDEWEB)

    Wirth, G.; Brueggemann, K.; Bostel, T.; Dueber, C.; Kreitner, K.F. [Universitaetsmedizin Mainz (Germany). Dept. of Radiology; Mayer, E. [Kerckhoff Hospital, Bad Nauheim (Germany). Dept. of Thoracic Surgery

    2014-08-15

    Chronic thromboembolic pulmonary hypertension (CTEPH) can be defined as pulmonary hypertension (resting mean pulmonary arterial pressure of 25 mm Hg or more determined at right heart catheterization) with persistent pulmonary perfusion defects. It is a rare, but underdiagnosed disease with estimated incidences ranging from 0.5% to 3.8% of patients after an acute pulmonary embolism (PE), and in up to 10% of those with a history of recurrent PE. CTEPH is the only form of pulmonary hypertension that can be surgically treated leading to normalization of pulmonary hemodynamics and exercise capacity in the vast majority of patients. The challenges for imaging in patients with suspected CTEPH are fourfold: the imaging modality should have a high diagnostic accuracy with regard to the presence of CTEPH and allow for differential diagnosis. It should enable detection of patients suitable for PEA with great certainty, and allow for quantification of PH by measuring pulmonary hemodynamics (mPAP and PVR), and finally, it can be used for therapy monitoring. This overview tries to elucidate the potential role of ECG-gated multidetector CT pulmonary angiography (MD-CTPA) and MR imaging, and summarizes the most important results that have been achieved so far. Generally speaking, ECG-gated MD-CTPA is superior to MR in the assessment of parenchymal and vascular pathologies of the lung, and allows for the assessment of cardiac structures. The implementation of iodine maps as a surrogate for lung perfusion enables functional assessment of lung perfusion by CT. MR imaging is the reference standard for the assessment of right heart function and lung perfusion, the latter delineating typical wedge-shaped perfusion defects in patients with CTEPH. New developments show that with MR techniques, an estimation of hemodynamic parameters like mean pulmonary arterial pressure and pulmonary vascular resistance will be possible. CT and MR imaging should be considered as complementary

  7. Chronic thromboembolic pulmonary hypertension (CTEPH). Potential role of multidetector-row CT (MD-CT) and MR imaging in the diagnosis and differential diagnosis of the disease

    International Nuclear Information System (INIS)

    Chronic thromboembolic pulmonary hypertension (CTEPH) can be defined as pulmonary hypertension (resting mean pulmonary arterial pressure of 25 mm Hg or more determined at right heart catheterization) with persistent pulmonary perfusion defects. It is a rare, but underdiagnosed disease with estimated incidences ranging from 0.5% to 3.8% of patients after an acute pulmonary embolism (PE), and in up to 10% of those with a history of recurrent PE. CTEPH is the only form of pulmonary hypertension that can be surgically treated leading to normalization of pulmonary hemodynamics and exercise capacity in the vast majority of patients. The challenges for imaging in patients with suspected CTEPH are fourfold: the imaging modality should have a high diagnostic accuracy with regard to the presence of CTEPH and allow for differential diagnosis. It should enable detection of patients suitable for PEA with great certainty, and allow for quantification of PH by measuring pulmonary hemodynamics (mPAP and PVR), and finally, it can be used for therapy monitoring. This overview tries to elucidate the potential role of ECG-gated multidetector CT pulmonary angiography (MD-CTPA) and MR imaging, and summarizes the most important results that have been achieved so far. Generally speaking, ECG-gated MD-CTPA is superior to MR in the assessment of parenchymal and vascular pathologies of the lung, and allows for the assessment of cardiac structures. The implementation of iodine maps as a surrogate for lung perfusion enables functional assessment of lung perfusion by CT. MR imaging is the reference standard for the assessment of right heart function and lung perfusion, the latter delineating typical wedge-shaped perfusion defects in patients with CTEPH. New developments show that with MR techniques, an estimation of hemodynamic parameters like mean pulmonary arterial pressure and pulmonary vascular resistance will be possible. CT and MR imaging should be considered as complementary

  8. The Incidence and Anatomy of Accessory Pudendal Arteries as Depicted on Multidetector-Row CT Angiography: Clinical Implications of Preoperative Evaluation for Laparoscopic and Robot-Assisted Radical Prostatectomy

    International Nuclear Information System (INIS)

    To help preserve accessory pudendal arteries (APAs) and to ensure optimal postoperative sexual function after a laparoscopic or robot-assisted radical prostatectomy, we have evaluated the incidence of APAs as detected on multidetector-row CT (MDCT) angiography and have provided a detailed anatomical description. The distribution of APAs was evaluated in 121 consecutive male patients between February 2006 and July 2007 who underwent 64- channel MDCT angiography of the lower extremities. We defined an APA as any artery located within the periprostatic region running parallel to the dorsal vascular complex. We also subclassified APAs into lateral and apical APAs. Two radiologists retrospectively evaluated the origin, course and number of APAs; the final APA subclassification based on MDCT angiography source data was determined by consensus. We identified 44 APAs in 36 of 121 patients (30%). Two distinct varieties of APAs were identified. Thirty-three APAs (75%) coursed near the anterolateral region of the prostatic apex, termed apical APAs. The remaining 11 APAs (25%) coursed along the lateral aspect of the prostate, termed lateral APAs. All APAs originated from the internal obturator artery and iliac artery or a branch of the iliac artery such as the inferior vesical artery. The majority of apical APAs arose from the internal obturator artery (84%). Seven patients (19%) had multiple APAs. APAs are more frequently detected by the use of MDCT angiography than as suggested by previous surgical studies. The identification of APAs on MDCT angiography may provide useful information for the surgical preservation of APAs during a laparoscopic or robot-assisted radical prostatectomy

  9. Hemobilia in a child due to right hepatic artery pseudoaneurysm: Multidetector-row computed tomography demonstration

    Directory of Open Access Journals (Sweden)

    Nisar A Wani

    2011-01-01

    Full Text Available We present a case of a 12-year-old boy who developed upper gastrointestinal bleeding in the form of hematemesis and melena 1 month after blunt trauma to liver. Computed tomography (CT angiography with multidetector-row CT demonstrated pseudoaneurysm of right hepatic artery related to old liver laceration to be the cause of the bleeding. Pseudoaneurysm was resected using the roadmap provided by CT angiography findings.

  10. High-concentration contrast media in neurological multidetector-row CT applications: implications for improved patient management in neurology and neurosurgery

    Energy Technology Data Exchange (ETDEWEB)

    Schramm, Peter [University of Heidelberg Medical Center, Department of Neuroradiology, Heidelberg (Germany)

    2007-07-15

    Dynamic CT scanning after intravenous injection of iodine contrast medium (CM) was proposed in the very early days of CT. The goal was to characterize tissue by extracting information from the temporal course of enhancement. In the early 1980s, modeling algorithms were already described in the literature for the quantitative calculation of cerebral blood flow (CBF). However, cerebral applications suffered from the insufficient temporal resolution available at that time and the central nervous system was already seen primarily as an MRI domain. The renaissance of dynamic CT in neurological applications came in the middle of the 1990s with the introduction of thrombolytic therapy in acute stroke. With CT being the primary imaging modality, getting additional hemodynamic information from the same device without having to move the patient appeared attractive. Multimodal CT protocols allow a comprehensive diagnosis of the emergency stroke patient in less than 15 minutes by combining nonenhanced CT (NECT), perfusion CT (PCT) and CT angiography (CTA). Dynamic PCT can also render important information in patients with intraaxial brain tumors, allowing differentiation not only between lymphoma and glioma but also between low-grade and high-grade glioma by quantifying local cerebral blood volume (CBV) and permeability of the blood-brain barrier (BBB). Hoever, even if a shorter imaging time permits a reduction in volume of CM, adequate total iodine levels must be preserved for dynamic CT applications. Increased concentrations of iodine are therefore helpful to obtain adequate total iodine levels for imaging. (orig.)

  11. Use of multidetector-row CT colonography for detection of colorectal neoplasia in patients referred via the Department of Health '2-week-wait' initiative

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, S.A.; Halligan, S. E-mail: s.halligan@ic.ac.uk; Saunders, B.P.; Morley, S.; Riesewyk, C.; Atkin, W.; Bartram, C.I

    2003-11-01

    AIM: Patients referred under the Department of Health 2-week wait initiative with symptoms of colorectal cancer frequently undergo whole-colon examination. We investigated the use of computed tomography (CT) colonography as an alternative to colonoscopy in this scenario. MATERIALS AND METHODS: Fifty-four consecutive patients, referred via the 2-week wait initiative and scheduled for colonoscopy, consented to undergo multidetector CT colonography immediately before endoscopy. The site and morphology of any polyp or cancer detected by CT was noted and comparison made with subsequent colonoscopy. RESULTS: Colonoscopy detected polyps or cancer in 29 patients (53.7%). CT colonography prospectively detected 18 of 41 (44%) polyps of 1-5 mm, three of four (75%) polyps of 6-9 mm, four of four (100%) polyps 10 mm or larger, and five of six (83%) cancers. The missed cancer occurred early in the series and was a perceptive error. The overall sensitivity, specificity, positive predictive value and negative predictive value of CT colonography for cancer and polyps 10 mm or greater on a per patient basis were 90, 100, 100 and 98%, respectively. CT detected one renal cancer and one colonic cancer, initially missed due to incomplete colonoscopy. CONCLUSION: CT colonography is a robust technique for investigation of symptomatic patients. The learning curve must be overcome for optimal performance.

  12. Use of multidetector-row CT colonography for detection of colorectal neoplasia in patients referred via the Department of Health '2-week-wait' initiative

    International Nuclear Information System (INIS)

    AIM: Patients referred under the Department of Health 2-week wait initiative with symptoms of colorectal cancer frequently undergo whole-colon examination. We investigated the use of computed tomography (CT) colonography as an alternative to colonoscopy in this scenario. MATERIALS AND METHODS: Fifty-four consecutive patients, referred via the 2-week wait initiative and scheduled for colonoscopy, consented to undergo multidetector CT colonography immediately before endoscopy. The site and morphology of any polyp or cancer detected by CT was noted and comparison made with subsequent colonoscopy. RESULTS: Colonoscopy detected polyps or cancer in 29 patients (53.7%). CT colonography prospectively detected 18 of 41 (44%) polyps of 1-5 mm, three of four (75%) polyps of 6-9 mm, four of four (100%) polyps 10 mm or larger, and five of six (83%) cancers. The missed cancer occurred early in the series and was a perceptive error. The overall sensitivity, specificity, positive predictive value and negative predictive value of CT colonography for cancer and polyps 10 mm or greater on a per patient basis were 90, 100, 100 and 98%, respectively. CT detected one renal cancer and one colonic cancer, initially missed due to incomplete colonoscopy. CONCLUSION: CT colonography is a robust technique for investigation of symptomatic patients. The learning curve must be overcome for optimal performance

  13. 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.

  14. Assessment of coronary artery aneurysms in paediatric patients with Kawasaki disease by multidetector row CT angiography: feasibility and comparison with 2D echocardiography

    International Nuclear Information System (INIS)

    Transthoracic ECHO is the locally accepted method for coronary surveillance of patients with Kawasaki disease but it may have limited visualization in the older child. To assess the feasibility of multidetector CT (MDCT) angiography in the follow-up of coronary artery aneurysms in children with previous Kawasaki disease. Six children (5 boys, 1 girl; mean age 11.5 years) with known Kawasaki disease and coronary artery involvement underwent CT coronary angiography using 16-detector MDCT. The visualized lengths and diameter of all coronary segments were measured. The number, size and location of coronary artery aneurysms were recorded and compared with recent ECHO. Twelve coronary artery aneurysms (seven saccular, five fusiform) were identified by MDCT angiography. One saccular aneurysm at the junction of the distal right coronary artery and posterior descending artery was not detected by ECHO while the remaining six in proximal segments were detected by both modalities. Two of five fusiform aneurysms were not detected by ECHO due to their small sizes. Excellent agreement was found between CT and ECHO for maximal diameter and length of the visualized aneurysms. MDCT angiography accurately defines coronary artery aneurysms. It is more sensitive for detecting aneurysms at distal coronary segments and fusiform aneurysms of small size

  15. The relevance of image quality indices for dose optimization in abdominal multi-detector row CT in children: experimental assessment with pediatric phantoms

    International Nuclear Information System (INIS)

    This study assessed and compared various image quality indices in order to manage the dose of pediatric abdominal MDCT protocols and to provide guidance on dose reduction. PMMA phantoms representing average body diameters at birth, 1 year, 5 years, 10 years and 15 years of age were scanned in a four-channel MDCT with a standard pediatric abdominal CT protocol. Image noise (SD, standard deviation of CT number), noise derivative (ND, derivative of the function of noise with respect to dose) and contrast-to-noise ratio (CNR) were measured. The 'relative' low-contrast detectability (rLCD) was introduced as a new quantity to adjust LCD to the various phantom diameters on the basis of the LCD1% assessed in a Catphan (registered) phantom and a constant central absorbed dose. The required variations of CTDIvol16 with respect to phantom size were analyzed in order to maintain each image quality index constant. The use of a fixed SD or CNR level leads to major dose ratios between extreme patient sizes (factor 22.7 to 44 for SD, 31.7 to 51.5 for CNR2.8%), whereas fixed ND and rLCD result in acceptable dose ratios ranging between factors of 2.9 and 3.9 between extreme phantom diameters. For a 5-9 mm rLCD1%, adjusted ND values range between -0.84 and -0.11 HU mGy-1. Our data provide guidance on dose reduction on the basis of patient dimensions and the required rLCD (e.g., to get a constant 7 mm rLCD1% for abdominal diameters of 10, 13, 16, 20 and 25 cm, tube current-time product should be adjusted in order to obtain CTDIvol16 values of 6.2, 7.2, 8.8, 11.6 and 17.7 mGy, respectively).

  16. Preoperative volume calculation of the hepatic venous draining areas with multi-detector row CT in adult living donor liver transplantation: impact on surgical procedure

    Energy Technology Data Exchange (ETDEWEB)

    Frericks, Bernd B.J. [Hanover Medical School, Departments of Radiology and Surgery, Hannover (Germany); University of Berlin, Department of Radiology, Berlin (Germany); Charite - University Medicine Berlin, Department of Radiology and Nuclear Medicine, Berlin (Germany); Kirchhoff, Timm D.; Shin, Hoen-Oh; Stamm, Georg; Merkesdal, Sonja; Abe, Takehiko; Galanski, Michael [Hanover Medical School, Departments of Radiology and Surgery, Hannover (Germany); Hanover Medical School, Department of Diagnostic Radiology, Hannover (Germany); Schenk, Andrea; Peitgen, Heinz-Otto [Hanover Medical School, Departments of Radiology and Surgery, Hannover (Germany); MeVis - Center for Medical Diagnostic Systems and Visualization, Bremen (Germany); Klempnauer, Juergen [Hanover Medical School, Departments of Radiology and Surgery, Hannover (Germany); Hanover Medical School, Department of Visceral- and Transplantation Surgery, Hannover (Germany); Nashan, Bjoern [Hanover Medical School, Departments of Radiology and Surgery, Hannover (Germany); Hanover Medical School, Department of Visceral- and Transplantation Surgery, Hannover (Germany); Dalhousie University, Multi Organ Transplant Program, Halifax, Nova Scotia (Canada)

    2006-12-15

    The purpose was to assess the volumes of the different hepatic territories and especially the drainage of the right paramedian sector in adult living donor liver transplantation (ALDLT). CT was performed in 40 potential donors of whom 28 underwent partial living donation. Data sets of all potential donors were postprocessed using dedicated software for segmentation, volumetric analysis and visualization of liver territories. During an initial period, volumes and shapes of liver parts were calculated based on the individual portal venous perfusion areas. After partial hepatic congestion occurring in three grafts, drainage territories with special regard to MHV tributaries from the right paramedian sector, and the IRHV were calculated additionally. Results were visualized three-dimensionally and compared to the intraoperative findings. Calculated graft volumes based on hepatic venous drainage and graft weights correlated significantly (r=0.86,P<0.001). Mean virtual graft volume was 930 ml and drained as follows: RHV: 680 ml, IRHV: 170 ml (n=11); segment 5 MHV tributaries: 100 ml (n=16); segment 8 MHV tributaries: 110 ml (n=20). When present, the mean aberrant venous drainage fraction of the right liver lobe was 28%. The evaluated protocol allowed a reliable calculation of the hepatic venous draining areas and led to a change in the hepatic venous reconstruction strategy at our institution. (orig.)

  17. Hereditary haemorrhagic telangiectasia: study of hepatic vascular alterations with multi-detector row helical CT and reconstruction programs; Telangiectasia emorragica ereditaria: TC multidetettore multifasica e programmi di ricostruzione nello studio delle alterazioni vascolari epatiche

    Energy Technology Data Exchange (ETDEWEB)

    Memeo, Maurizio; Stabile Ianora, Amato Antonio; Scaldapane, Arnaldo; Rotondo, Antonio; Angelelli, Giuseppe [Policlinico Universitario, Bari (Italy). DiMIMP Sezione di Diagnostica per Immagini; Suppressa, Patrizia; Cirulli, Anna; Sabba' , Carlo [Policlinico Universitario, Bari (Italy). Centro Interdipartimentale per lo studio dell' HHT

    2005-02-01

    Purpose: To evaluate hepatic alterations in patients affected by Hereditary Haemorrhagic Telangiectasia (HHT) by using multidetector row helical CT (MDCT) and new reconstruction programs. Materials and methods: An MDCT multiphasic study of the liver was performed in 105 consecutive patients: 89 considered to be affected by HHT and 16 with suspicion of disease alone. The scan delay was determined by using a test bolus of contrast material. The CT examination was performed with a triphasic technique (double arterial phase and portal venous phase). multiplanar and angiographic reconstructions were then obtained, and the images checked for the presence of shunts, hepatic perfusion disorders, vascular lesions (telangiectasis and large confluent vascular masses), indirect signs of portal hypertension, and anatomical vascular variants. Results: Hepatic vascular alterations were found in 78/105 cases (67/89) patients affected by HHT and 11/16 patients with clinical suspicion alone). Therefore HHT diagnosis was excluded in 5 patients. 78/100 (78%) patients with HHT had intrahepatic vascular alterations: arterioportal shunts in 40/78 (51.2%) arteriosystemic shunts in 16/78 (20.5%) and both shunt types in 22/78 (28.3%). Intraparenchymal perfusion disorders were found in 46/78 (58.9%) patients. Telangiectasis were recognised in 50/78 (64.1%) patients. Large confluent vascular masses (LCVMs) were identified in 20/78 (25.6%) patients. indirect signs of portal hypertension were found in 46/78 (58.9%) cases. Variant hepatic arterial anatomy was present in 38/100 cases (38%). Conclusions: Multiphasic MDCT and the new reconstruction programs enable the identification and characterisation of the complex vascular alterations typical of HHT. [Italian] Scopo: Valutare le alterazioni epatiche nei pazienti affetti da Telangiectasia Emorraica Ereditaria (TEE) utilizzando una TC multidetettore (TCMD) ed in nuovi programmi di ricostruzione. Materiale e metodi: E' stato eseguito uno

  18. Comparative Study on 16-slice CT Coronary Angiography vs Conventional Coronary Angiography-A Report of 38 Cases

    Institute of Scientific and Technical Information of China (English)

    Yan CHEN; Ping HAN; Bo LIANG; Huimin LIANG; Ziqiao LEI; Zhiliang TIAN; Gansheng FENG; Jie XIAO

    2008-01-01

    The clinical application of 16-slice CT coronary angiography (CTCA) and the impact of plaques differently characterized on assessing coronary artery stenosis were evaluated. Thirty-eight patients with coronary artery disease diagnosed by conventional coronary angiography (CAG) un- derwent 16-slice CTCA (collimation: 16×0.75 mm; rotation time: 420 msec; kernel: 35f; effective current: 500 mAs; tube voltage: 120 kV). The interval between CTCA and CAG was within one month. CTCA was evaluated by consensus of two independent experienced radiologists unknowing CAG findings. Original images, maximum intensity projections and multiplanar reconstructions were used to assess coronary artery stenosis. For a determined plaque an attenuation value≥130 HU was considered as calcified, and <130 HU noncalcified. The plaques were then classified into significant calcification (extensive calcification), medium calcification (small isolated calcification) and noncal- cification. The diagnostic accuracy of 16-slice CTCA findings as well as to detect ≥50% stenoses caused by plaques was evaluated respectively regarding CAG as the standard of reference. In com- parison with CAG findings, the sensitivity, specificity, positive and negative predictive value derived from CTCA for mild stenosis (<50%) were 72.7%, 38.5%, 50%, 62.5%, respectively; for moderate stenosis (50%-75%) 82.4%, 72.7%, 70%, 84.2%, resepctively; and for severe coronary stenosis (>75%) 85%, 90.5%, 81%, 92.7% respectively. With the increase of stenoses degree, the value of CTCA was greater. For the classification of the plaque calcification with ≥50% stenosis CTCA at- tained the sensitivity, specificity, positive and negative predictive value for severe calcificatoin 73.3%, 22.2%, 61.1% and 33.3%, respectively; for moderate calcification 70%, 55.6%, 63.6% and 62.5%, respectively; for noncalcification 93.8%, 85.7%, 93.8% and 85.7% respectively. CTCA was restricted in assessing coronary artery stenosis in the

  19. Multidetector row computed tomography in bowel obstruction. Part 2. Large bowel obstruction

    Energy Technology Data Exchange (ETDEWEB)

    Sinha, R. [Department of Radiology, Glenfield Hospital, Leicester (United Kingdom)]. E-mail: rakesh.sinha@uhl-tr.nhs.uk; Verma, R. [Department of Radiology, Glenfield Hospital, Leicester (United Kingdom)

    2005-10-01

    Large bowel obstruction may present as an emergency as high-grade colonic obstruction and can result in perforation. Perforated large bowel obstruction causes faecal peritonitis, which can result in high morbidity and mortality. Multidetector row computed tomography (MDCT) has the potential of providing an accurate diagnosis of large bowel obstruction. The rapid acquisition of images within one breath-hold reduces misregistration artefacts than can occur in critically ill or uncooperative patients. The following is a review of the various causes of large bowel obstruction with emphasis on important pathogenic factors, CT appearances and the use of multiplanar reformatted images in the diagnostic workup.

  20. Comparison of the Multidetector-row Computed Tomographic Angiography Axial and Coronal Planes' Usefulness for Detecting Thoracodorsal Artery Perforators

    OpenAIRE

    Jong Gyu Kim; Soo Hyang Lee

    2012-01-01

    Background During the planning of a thoracodorsal artery perforator (TDAP) free flap, preoperative multidetector-row computed tomographic (MDCT) angiography is valuable for predicting the locations of perforators. However, CT-based perforator mapping of the thoracodorsal artery is not easy because of its small diameter. Thus, we evaluated 1-mm-thick MDCT images in multiple planes to search for reliable perforators accurately. Methods Between July 2010 and October 2011, 19 consecutive patients...

  1. 16排CT胸部平扫与重建临床运用分析%Clinical application of 16-slices CT to chest plain scan and reconstruction

    Institute of Scientific and Technical Information of China (English)

    王家荣; 肖化石

    2012-01-01

    目的 探讨16排CT胸部平扫与重建在胸部疾病的诊断和临床应用价值.方法 选取60例诊断为胸部疾病的住院患者进行16排CT薄层连续扫描,对结果进行容积重建、多平面重建和曲面重建分析.结果 60例患者的胸部疾病都在VR、MPR和CPR图像中得到清楚的显示.结论 16排CT胸部平扫与重建在胸部疾病的诊断中有重要应用价值.%Objective To discuss the clinical application value of 16 - slices CT to chest plain scan and reconstruction in the diagnosis of thoracopathy. Methods Sixty hospitalized patients who were diagnosed as thoracopathy were selected to receive the 16 -slices CT thin continuous scanning. According to the examination results, volume reconstruction, multiplanar reconstruction, and surface reconstruction analysis were made. Results The thoracopathy of the 60 patients were clearly shown on the VR, MPR, and CPR images. Conclusion The 16 - slices CT chest plain scan and reconstruction has important application value in the diagnosis of thoracopathy.

  2. Clinico-statistical study of preoperative examination for the dental implant using multi-detector row computed tomography

    International Nuclear Information System (INIS)

    In April 2006, a new affiliated hospital opened at Nihon University School of Dentistry at Matsudo, and the latest model was introduced into the department of radiology. CT examinations for preoperative dental implant going on 64 multi-detector row CT, the number of cases has increased. CT examination is useful for preoperative dental implant, and many studies of concerning clinical studies using CT images have been reported. The purpose of this study was to the clinico-statistical studies of preoperative CT examinations for dental implant at our radiology department using 64 multi-detector row CT. The subjects consisted of 5174 regions in 1312 cases of preoperative CT examinations, between April 2006 and December 2007. CT machine used was the Aquilion TM64 (Toshiba Medical Systems, Japan), and the workstation used was the ZIOSTATION (ZIOSOFT, Japan). All of CT examinations were performed the position of implant placement and disease examined from CT findings. The following results were obtained: The 1312 cases consisted of 426 males and 886 females. Patient age ranged from 16 yrs to 86 yrs old, the average age were 55.5 yrs old. Six hundred and seventy four cases were ordered at another private dental office not our hospital, and 638 cases were ordered at our hospital. The numbers of implant placement were on the average of 3.9, and the rate got higher with age. The lesions which detected by preoperative CT examination were maxillary sinusitis, periodontitis, ectopic calcification, and mucous retention cyst. (author)

  3. Comparison between multi-detector row CT angiography and Doppler ultrasound on detecting carotid artery wall thickness%多层螺旋CT与Doppler超声对颈动脉壁层厚度的对比性研究

    Institute of Scientific and Technical Information of China (English)

    赵刚; 查云飞; 王弘; 洪玮; 邱晓明; 王珍; 肖友梅

    2013-01-01

    Objective To explore the relationship and consistency between multi-detector row computed tomography angiography (MDCTA) and color Doppler ultrasound (CD-US) in measuring carotid artery wall thickness (CAWT) and intima-media thickness (IMT). Methods CAWT and IMT of 38 subjects were measured using MDCTA and CD-US, respectively. Linear correlation analysis was performed to analyze the correlation between the results from CAWT and IMT,and Bland-Altman statistics was employed to analyze the consistency between them. Results The IMT value measured by CD-US was (0.85+0.16) mm, and the CAWT value measured by MDCTA was (0.87.± 0.18) mm (P > 0.05), and there was a high degree of correlation between them (correlation coefficient was 0.958,P< 0.01). An excellent consistency between CAWT and IMT was found by Bland-Altman plot, with a bias of 0.026 mm and the limit of consistency from -0.023 to 0.075. Conclusions There were significant correlation and consistency between MDCTA and CD-US in detecting CAWT and IMT. As a more objective and comprehensive new method, MDCTA can replace CD-US in the evaluation of early carotid atherosclerosis.%目的:探讨多层螺旋CT血管造影(MDCTA)和彩色多普勒超声(CD-US)在检测颈总动脉壁厚度(CAWT)和颈总动脉内膜-中层厚度(IMT)中的相关性和一致性.方法:应用MDCTA和CD-US分别对38例受试者颈总动脉的CAWT和IMT进行检测,用Pearson直线相关分析比较CAWT和IMT的相关性,用Bland-Altman分析比较两者的一致性.结果:MDCTA测量的颈总动脉CAWT为(0.87±0.18)mm,CD-US测量的颈总动脉IMT为(0.85±0.16)mm,两者比较无统计学差异,有高度相关性,相关系数为0.958,P<0.01,Bland-Altman分析两者间存在良好一致性,偏倚为0.026 mm,一致性界限为-0.023 ~ 0.075.结论:MDCTA和CD-US在检测颈总动脉CAWT和IMT时存在良好的相关性和一致性,MDCTA可以替代CD-US,作为一种评价颈动脉早期粥样硬化的更加客观全面的新方法.

  4. Asbestos Surveillance Program Aachen (ASPA): initial results from baseline screening for lung cancer in asbestos-exposed high-risk individuals using low-dose multidetector-row CT

    International Nuclear Information System (INIS)

    The purpose of this study was to assess the prevalence of lung cancer in a high-risk asbestos-exposed cohort using low-dose MDCT. Of a population of 5,389 former power-plant workers, 316 were characterized as individuals at highest risk for lung cancer according to a lung-cancer risk model including age, asbestos exposure and smoking habits. Of these 316, 187 (mean age: 66.6 years) individuals were included in a prospective trial. Mean asbestos exposure time was 29.65 years and 89% were smokers. Screening was performed on a 16-slice MDCT (Siemens) with low-dose technique (10/20 mAseff.; 1 mm/0.5 mm increment). In addition to soft copy PACS reading analysis on a workstation with a dedicated lung analysis software (LungCARE; Siemens) was performed. One strongly suspicious mass and eight cases of histologically proven lung cancer were found plus 491 additional pulmonary nodules (average volume: 40.72 ml, average diameter 4.62 mm). Asbestos-related changes (pleural plaques, fibrosis) were visible in 80 individuals. Lung cancer screening in this high-risk cohort showed a prevalence of lung cancer of 4.28% (8/187) at baseline screening with an additional large number of indeterminate pulmonary nodules. Low-dose MDCT proved to be feasible in this highly selected population. (orig.)

  5. 16-Slice CT in the Diagnosis of Lumbar Disc Herniation%16排CT在腰椎间盘突出诊断中的应用

    Institute of Scientific and Technical Information of China (English)

    王浩然

    2015-01-01

    Objective To analyze the 16-slice CT in the diagnosis of lumbar disc herniation. Methods 16-slice spiral CT for patients with traditional disc-level axial scan and full lumbar vertebral full volume scan. Results The diagnosis of L2~L3 segment bulging large differences (P0.05). Conclusion 16-slice spiral CT scanning technology to check lumbar disc is better than traditional scanning technology.%目的:分析16排CT在腰椎间盘突出诊断的应用。方法在诊断患者中使用16排螺旋CT机进行传统椎间盘层面轴位扫描和全腰椎容积扫描,比较诊断的结果。结果诊断L2~L3段膨出差异较大(P<0.05),诊断突出L1~L2、L3~L4、L4~L5、L5~S1段两种扫描方法诊断膨出和突出效果差异较小(P>0.05)。讨论16排螺旋CT扫描技术在检查腰椎间盘突出明显优于传统扫描技术。

  6. A Study of Measurements of Spinal Canal at the Level of Lower Three Lumbar Vertebra by 16 Slice CT Scanner in Nepalese Population

    OpenAIRE

    Mukesh Mallik; Keshav Paudel; Nuwadatta Subedi; Sanjay Sah; Anish Subedee; Deepak Adhikari

    2015-01-01

    Background and Objective: The study was conducted with the objectives to establish the measurements of spinal canal and lumbar vertebra at L3 to L5 region in Nepalese population. Methodology: It is a cross-sectional study among 36 patients (17 males and 19 females) having age variation from 20-60years whose abdomen was scanned by GE bright speed 16 slice CT scanner with slice thickness 10mm and then reconstructed at 1.2mm for images in different body plains for the measurement of spinal canal...

  7. 不典型肝脓肿的16层CT诊断%16-Slice CT Diagnosis of Atypical Hepatic Abscesses

    Institute of Scientific and Technical Information of China (English)

    沙钧平; 丁锋; 徐文奎

    2011-01-01

    目的:探讨不典型肝脓肿的16层螺旋CT表现及其诊断价值.方法:经病理或临床证实21例不典型肝脓肿病人纳入研究,男15例,女6例,年龄35~81岁,平均60岁,采用16层螺旋CT增强三期扫描,层厚5mm.结果:不典型肝脓肿16层CT平扫表现多样,缺乏特点,多期增强有较特征表现.结论:不典型肝脓肿的多期增强CT扫描较有特征,有助于定性诊断.%Purpose: To assess the 16 - slice CT features of atypical hepatic abscesses and their diagnostic value. Methods: Twenty - one patients(male 15, female 6, age ranged from 35 to 81 years, mean age 60 years) with atypical hepatic abscesses which were confirmed at pathology or clinics were enrolled in this study. The precontrast and three - phase contrasted scan were undertaken with a 16 - slice CT scanher. Results: The CT findings of the atypical hepatic abscesses on precontrast scans were varied and were not specific, but that on contrasted scans had characteristics. Conclusion: The CT findings of atypical hepatic abscesses on multiphase enhanced CT scans were more specific, which were helpful to a correct diagnosis.

  8. Rectal cancer staging: Multidetector-row computed tomography diagnostic accuracy in assessment of mesorectal fascia invasion

    OpenAIRE

    Ippolito, Davide; Drago, Silvia Girolama; Franzesi, Cammillo Talei; Fior, Davide; Sironi, Sandro

    2016-01-01

    AIM: To assess the diagnostic accuracy of multidetector-row computed tomography (MDCT) as compared with conventional magnetic resonance imaging (MRI), in identifying mesorectal fascia (MRF) invasion in rectal cancer patients.

  9. The Value of Multi-detector row CT in Gastroenteropathy and Application of Contrast Agents%MDCT在胃肠道检查中的价值及对比剂的应用

    Institute of Scientific and Technical Information of China (English)

    鲁桂青; 陈克敏; 刘林祥

    2007-01-01

    胃肠道疾患在过去以传统的检查方法 (主要为消化道钡剂透视及纤维内窥镜)为主,随着多层螺旋CT(multi-detector row CT,MDCT)的快速发展以及各种不同腔内对比剂的研究与应用,CT对胃肠道的检查价值显著提高。

  10. 肝癌患者活体肝移植术后并发症的MDCT和MRI评价%Postoperative Complications after Living Donor Liver Transplantation for Patients with Hepatocellular Carcinoma:Evaluation by Multi-Detector Row Spiral CT and Magnetic Resonance Imaging

    Institute of Scientific and Technical Information of China (English)

    陈光文; 刘曦娇; 宋彬; 黄子星

    2011-01-01

    Objective To investigate the radiological appearances of postoperative complications after living donor liver transplantation for patients with hepatocellular carcinoma under multi-detector row spiral computed tomography (MDCT) and magnetic resonance imaging (MRI) examination. Methods Thirty-nine imaging data in 20 patients with hepatocellular carcinoma after living donor liver transplantation from January 2008 to June 2010 in the West China Hospital were included and analyzed by two radiologists respectively. The relations between the types of complications and radiological appearances were especially recorded. Results All the cases experienced complications to different extent. Common surgical complications occured in 20 cases, including pertitoneal fluid collection (14 cases), pneumoperitoneum (2 cases), swelling of peritoneum, omentum, and mesentery (1 case), abdominal wall swelling (2 cases), pleural effusion (9 cases), and pericardial fluid collection (2 cases). Hepatic vascular complications involved hepatic artery in 3 cases, portal vein in 5 cases. Biliary complications presented in 7 cases, including anastomotic stenosis of biliary duct (6 cases) and bile leak (1 case). Graft parenchymal complications included intrahepatic lymph retention (11 cases), infarction (3 cases), and infection (2 cases). Intrahepatic recurrence in 5 cases, intraperitoneal metastasis in 3 csses and pulmonary metastasis in 2 cases. Conclusion MDCT and MRI have important diagnostic values for postoperative complications after living donor liver transplantation for patients with hepatocellular carcinoma.%目的 分析肝癌患者行活体肝移植(living donor liver transplantation,LDLT)术后并发症的多层螺旋CT(multi-detector row spiral CT,MDCT)和磁共振成像(magnetic resonance imaging,MRI)表现.方法 纳入2008年1月至2010年6月期间在四川大学华西医院接受LDLT的肝癌患者20例共计39份影像资料,由两位放射科医师回顾性分析图像,观察

  11. Assessment of global und regional left ventricular function with a 16-slice spiral-CT using two different software tools for quantitative functional analysis and qualitative evaluation of wall motion changes in comparison with magnetic resonance imaging; Moeglichkeiten der 16-Schicht-CT bei der linksventrikulaeren Funktionsbestimmung: Beurteilung zweier unterschiedlicher Software-Tools zur quantitativen Funktionsanalyse sowie qualitative Bewertung von Wandbewegungsstoerungen im Vergleich zur Magnetresonanztomographie

    Energy Technology Data Exchange (ETDEWEB)

    Koch, K.; Oellig, F.; Kunz, P.; Bender, P.; Oberholzer, K.; Mildenberger, P.; Kreitner, K.F.; Thelen, M. [Klinik und Poliklinik fuer Radiologie, Johannes Gutenberg-Univ. Mainz (Germany); Hake, U. [Klinik fuer Herz-, Thorax- und Gefaesschirurgie, Johannes Gutenberg-Univ. Mainz (Germany)

    2004-12-01

    Purpose: To determine global and regional left ventricular (LV) function from retrospectively gated multidetector row computed tomography (CT) by using two different semiautomated analysis tools and to correlate the results with those of magnetic resonance imaging (MRI). Materials and Methods: Nineteen patients (5 females, 14males, mean age 69 years) underwent 16-slice spiral-CT (MS-CT) with standard technique without administration of {beta}-blockers for a decrease in the cardiac rate. Ten series of images were reconstructed at every 10% of the RR-interval. With commercially available software capable of semiautomated contour detection, end-diastolic and end-systolic LV volumes (EDV and ESV) were determined from short-axis multiplanar CT reformations (MPR). Axial images of the end-systolic and end-diastolic cardiac phase were transformed to 3D volumes (3D) to determine EDV and ESV by using a threshold-supported reconstruction algorithm dependent on the contrast enhancement of the left ventricle. Steady-state free-precession cine MR images were acquired in short-axis orientation on the same day in all but one patient. Regional wall motion was assessed qualitatively in 17 left ventricular segments and classified as normo-, hypo-, a- or dyskinetic. Bland-Altman analysis was performed to calculate limits of agreement and systematic errors between CT and MRI. Results: For MPR/3D, mean end-diastolic (144.4/142.8 mL {+-} 67.5/67.1) and end-systolic (66.4/68.7 mL {+-} 52.1/49.9) LV volumes as determined with MS-CT correlated well with MRI measurements (147.6 mL {+-} 67.6 [r = 0.98/0.96] and 73.3 mL {+-} 55.5 [r = 0.98/0.98], respectively [p <.001]). LV stroke volume (77.6/74.1 {+-} 19.2/23.4 mL for CT vs. 74.4 mL {+-} 13.4 for MRI, r = 0.92/0.74) and LV ejection fraction (58.6/55.9% {+-} 13.5/13.7 for CT vs. 55.6% {+-} 13.5 for MRI, r = 0.95/0.91) also showed good correlation (p<.001). Regional wall motion analysis revealed agreement between CT and MRI in 316/323 (97

  12. Imaging features of solid pseudopapillary tumor of the pancreas on multi-detector row computed tomography

    Institute of Scientific and Technical Information of China (English)

    Deng-Bin Wang; Qing-Bing Wang; Wei-Min Chai; Ke-Min Chen; Xia-Xing Deng

    2009-01-01

    AIM:To retrospectively analyze the imaging features of solid-pseudopapillary tumors (SPTs) of the pancreas on multi-detector row computed tomography (MDCT) and define the imaging findings suggestive of malignant potential.METHODS: A total of 24 consecutive cases with surgically and pathologically confirmed SPTs of the pancreas underwent preoperative abdominal MDCT studies in our hospital. All axial CT images, CT angiographic images, and coronally and sagittally reformed images were obtained. The images were retrospectively reviewed at interactive picture archiving and communication system workstations. RESULTS: Of the 24 cases of SPTs, 11 cases (45.8%) occurred in the pancreatic head and seven (29.1%) in the tail. Eighteen were pathologically diagnosed as benign and six as malignant. MDCT diagnosis of SPTs was well correlated with the surgical and pathological results (Kappa = 0.6, P < 0.05). The size of SPTs ranged from 3 to 15 cm (mean, 5.8 cm). When the size of the tumor was greater than 6 cm (including 6cm), the possibilities of vascular (8 vs 1) and capsular invasion (9 vs 0) increased significantly ( P < 0.05). Two pathologically benign cases with vascular invasion and disrupted capsule on MDCT presented with local recurrence and hepatic metastases during follow-up about 1 year after the resection of the primary tumors.CONCLUSION: Vascular and capsular invasion with superimposed spread into the adjacent pancreatic parenchyma and nearby structures in SPTs of the pancreas can be accurately revealed by MDCTpreoperatively. These imaging findings are predictive of the malignant potential associated with the aggressive behavior of the tumor, even in the pathologically benign cases.

  13. Multidetector-row computed tomography imaging characteristics of mechanical prosthetic valves

    NARCIS (Netherlands)

    Symersky, P.; Budde, R.P.; Prokop, M.; Mol, B.A. de

    2011-01-01

    BACKGROUND AND AIM OF THE STUDY: Electrocardiogram-gated multidetector-row computed tomography (MDCT) imaging may aid in the evaluation of prosthetic valve dysfunction. A pulsatile in vitro model was developed to study the MDCT imaging characteristics of mechanical heart valves (MHVs). METHODS: Bjor

  14. Multidetector-Row Computed Tomography Imaging Characteristics of Mechanical Prosthetic Valves

    NARCIS (Netherlands)

    Symersky, Petr; Budde, Ricardo P. J.; Prokop, Mathias; de Mol, Bas A. J. M.

    2011-01-01

    Background and aim of the study: Electrocardiogram-gated multidetector-row computed tomography (MDCT) imaging may aid in the evaluation of prosthetic valve dysfunction. A pulsatile in vitro model was developed to study the MDCT imaging characteristics of mechanical heart valves (MHVs). Methods: Bjor

  15. A Study of Measurements of Spinal Canal at the Level of Lower Three Lumbar Vertebra by 16 Slice CT Scanner in Nepalese Population

    Directory of Open Access Journals (Sweden)

    Mukesh Mallik

    2015-07-01

    Full Text Available Background and Objective: The study was conducted with the objectives to establish the measurements of spinal canal and lumbar vertebra at L3 to L5 region in Nepalese population. Methodology: It is a cross-sectional study among 36 patients (17 males and 19 females having age variation from 20-60years whose abdomen was scanned by GE bright speed 16 slice CT scanner with slice thickness 10mm and then reconstructed at 1.2mm for images in different body plains for the measurement of spinal canal. Results: Almost all the parameters increase from L3 to L4 to L5 but the difference is more between L4 and L5 than between L3 and L4 except in vertebral body width (VBW where it increases smoothly, however canal body ratio (CBR remained constant at 0.6. All the parameters were larger in males than in females except antero-posterior dimension of canal in transverse section (APT which is larger in females. It also shows that none of the parameters vary significantly depending upon sex except vertebral body width (VBW at L3 which is 39.041 ± 4.1334 in males and 36.474 ± 2.8509 in females (p=0.036. Conclusion: Antero- posterior dimension in trans-verse and sagittal is almost identical but the chances of measurement error is higher in transverse due to trigonal shape of canal so AP diameter should be done in sagittal section as this is consistent and measures 14mm at L3, 14mm at L4 and 15 mm at L5 hence defining average antero-posterior canal dimension in sagittal section to be 14 mm but CBR constant at 0.6. DOI: http://dx.doi.org/10.3126/jcmsn.v10i4.12971 JCMS Nepal 2014; 10(4:6-11

  16. 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.

  17. Multidetector-row spiral computed tomography in chest emergencies; MSCT bei thorakalen Notfaellen

    Energy Technology Data Exchange (ETDEWEB)

    Wildberger, J.E.; Leiner, T. [Maastricht University Medical Center (MUMC) (Netherlands). Department of Radiology; Mahnken, A.H. [Universitaetsklinikum Aachen (Germany). Klinik fuer Radiologische Diagnostik; RWTH Aachen (Germany). Angewandte Medizintechnik, Helmholtz-Institut fuer Biomedizinische Technik

    2009-06-15

    With ongoing advances in multidetector-row computed tomography (MDCT) using ECG gating, differentiated examination protocols have become technically feasible. For acute chest pain assessment a strict triage of patients is indispensable, as the radiation dose is approximately 3 times higher for a dedicated protocol compared to a standard chest MDCT. Clinical requests considering pathologies of the pulmonary arteries, the aortic arch and the descending aorta can safely be answered with a standard CT data set. However, for the coronary arteries as well as for the ascending aorta, ECG synchronization of the data set is required. Initial reports regarding MDCT assessment for acute chest pain report a high negative predictive value. With the latest MDCT platforms available, medical preparation is no longer necessary with the exception of sublingual application of nitroglycerine. Dedicated contrast injection protocols, however, are necessary for simultaneous opacification of the pulmonary arteries as well as of the aorta and the coronary arteries. Further prospective studies will have to provide more evidence-based data for acute chest pain assessment with MDCT and will also have to outline the cost-effectiveness of this imaging technique. (orig.) [German] Die Weiterentwicklung der Mehrschichtspiralcomputertomographie (MSCT) mit EKG-Synchronisation ermoeglicht differenzierte Untersuchungsprotokolle zur Abklaerung unklarer thorakaler Schmerzereignisse, erfordert jedoch aufgrund der gegenueber einer herkoemmlichen CT des Thorax ca. 3-fach hoeheren Strahlenexposition eine enge Indikationsstellung. Fragestellungen, die isoliert die Lungengefaesse, den Aortenbogen bzw. die deszendierende Aorta betreffen, koennen meist bereits mit einem Standard-CT-Datensatz beantwortet werden, fuer Pathologien der Aorta ascendens und zum Ausschluss einer koronaren Herzerkrankung (KHK) ist eine Submillimeterkollimation mit EKG-Synchronisation hingegen unerlaesslich. Erste Studienergebnisse

  18. The Imaging findings of Papillary Thyroid Cancer in 16-slice CT%甲状腺乳头状癌16层螺旋CT表现

    Institute of Scientific and Technical Information of China (English)

    高德培; 谭静; 封俊; 李卓琳; 杨光军

    2011-01-01

    目的 探讨甲状腺乳头状癌在16层螺旋CT影像上的表现.方法 回顾性分析经病理证实的123例甲状腺乳头状癌的16层螺旋CT征象,并对征象进行统计分析.结果 123例甲状腺乳头状癌中单叶发病95例(77.24%),双叶15例(12.20%),峡部13例(10.57%).98例(79.67%)甲状腺乳头状癌平扫为低密度,余25例(20.33%)表现为等密度.21例(17.07%)有沙粒样钙化,38例(30.89%)有斑块样钙化.91例(73.98%)表现为中等度强化,但强化欠均匀,余32例(26.02%)表现为明显强化,但强化欠均匀.增强后101例(82.11%)表现为病灶边缘规整、清晰,22例(17.88%)病灶不规则.80例(65.04%)与周围组织关系清楚,43例(34.96%)与周围组织关系不清楚.75例(60.98%)颈部淋巴结转移.结论甲状腺乳头状癌的CT表现为甲状腺实质内3cm以下低密度,边缘清楚,中等度或中等度以上欠均匀强化的结节病变.%Objective To investigate the imaging findings of the papillary thyroid carcinoma in 16-slice CT.Methods The CT features 123 cases of thyroid papillary carcinoma proven pathologically were analyzed retrospectively.Results Of 123 cases of thyroid papillary carcinoma, the lesion was located in single lobe of the thyroid in 95 cases (77.24%), double-lobe in 15 cases (12.20%), isthmus in 13 cases (10.57%).The lesion of lower attenuation was displayed in 98 cases (79.67%), isodense in 25 cases (20.33%).The sand-like calcification were showed in 21 (17.07%), and plaque calcification in 38 patients (30.89%).The moderate non-homogeneous enhancement was displayed in 91 cases (73.98%), and marked non-homogeneous enhancement in 32 cases (26.02%).The lesion had regular and clear edge in 101 cases (82.11%), irregular in 22 cases (17.88%).Of 80 cases (65.04%) showed be well defined with the surrounding tissue, ill-defined in 43 cases (34.96%).The cervical meta-static lymph nodes were found in 75 cases (60.98%).Conclusions The CT findings of papillary

  19. Multidetector-row computed tomography in the planning of abdominal perforator flaps.

    Science.gov (United States)

    Masia, J; Clavero, J A; Larrañaga, J R; Alomar, X; Pons, G; Serret, P

    2006-01-01

    An accurate preoperative evaluation of the vascular anatomy of the abdominal wall is extremely valuable in improving the surgical strategy in abdominal perforator flaps. The multidetector-row computer tomography offers thin slice coverage of extended volumes with an extremely high spatial resolution. From October 2003 to December 2004, 66 female patients had breast reconstruction surgery in our department using the deep inferior epigastric artery perforator flap. Our multidetector-row computer tomography studies were performed using a 16-detector-row computer tomography scanner. The image assessment was carried out using the following protocol: we first identified the best three perforators from each side of the abdomen. Then we conducted a three-dimensional reconstruction of the abdomen by identifying exactly where the three best perforators emerged from the rectus abdominis fascia. We then transferred the data obtained from the image to the patient using a coordinate system. In addition, we also placed the dominant perforators in the patient by using a conventional hand-held Doppler. During the operation we compared intra-operative findings, Doppler results and computer tomography outcomes. Neither false positive nor false negative results were found in the computer tomography outcome. Multidetector-row computer tomography provides us with an easy method of interpreting the virtual anatomic dissection in three dimensions. It has high sensitivity and specificity and provides a good quality evaluation of the perforator vessels. This information allows reduction of operating time and safer performance of surgery. The multidetector-row computer tomography is a highly effective tool in the preoperative study of abdominal perforator flaps. PMID:16716952

  20. 16层螺旋CT血管成像在腹主动脉瘤中的诊断价值%The Value of 16-slice Spiral CT Angiography in the Diagnosis of Abdominal Aortic Aneurysm

    Institute of Scientific and Technical Information of China (English)

    谭迎杰

    2014-01-01

    Objective To evaluate the diagnostic value of 16-slice spiral CT angiography for abdominal aortic aneurysm. Methods 28 patients with abdominal aortic aneurysm underwent 16-slice spiral CT angiography in our hospital from 2011 to 2013 were se-lected as the subjects, and the lesion detection was analyzed. Results Confirmed by operation or DSA, 28 patients with abdominal aortic aneurysm included 9 cases of abdominal aortic dissection aneurysm, 2 cases of pseudo abdominal aortic aneurysm, and 17 cases of true abdominal aortic aneurysm;3 cases of abdominal aortic aneurysm ruptured. Conclusion 16-slice spiral CT angiogra-phy has certain advantages in the diagnosis of abdominal aortic aneurysm, which is worthy of clinical promotion and application.%探讨16层螺旋CT血管成像在腹主动脉瘤中的诊断价值。方法研究对象为该院收治的28例腹主动脉瘤患者,均行16层多排螺旋CT血管成像,分析其病变检出情况。结果经过手术或DSA证实,28例腹主动脉瘤患者包括9例腹主动脉夹层动脉瘤、2例假性腹主动脉瘤及17例真性腹主动脉瘤,3例患者腹主动脉瘤出现破裂。结论16层螺旋CT血管成像对腹主动脉瘤的诊断具有一定优势,值得临床上推广应用。

  1. 16排螺旋CT对肋骨骨折的诊断意义%Fracture the Value of 16-Slice Spiral CT and 3D Display in Dliagnosis of Costal

    Institute of Scientific and Technical Information of China (English)

    张哲; 石静; 史明军

    2011-01-01

    目的:探讨多排螺旋CT及三维成像对肋骨骨折的诊断价值.方法:对临床怀疑肋骨或肋软骨骨折48例患者采用胸部16排螺旋CT容积扫描,进行多平面重建、最大密度投影、容积成像、薄层重建及曲面重建等图像后处理及对各种后处理图像进行观察和比较分析.结果:48例患者中CR检查发现82处肋骨骨折,16排螺旋CT检查发现肋骨骨折101处.结论:肋软骨骨折,微细骨折,无明显错位的不完全性骨折应用常规CR检查诊断困难,16排螺旋CT及三维成像对肋骨骨折有重要价值.%Objective: To evaluate the valuate of 16-slice spiral CT and 3D display in diagnosis of costal fracture. Methods: 48 casesof thoracic trauma with suspition of costal and costal cartilage frctures received chest 16-slice spiral Ctorginal scanning image, after that we get 3D, MPR and VR image. All the imagaing materials were reviewed and studyed retropectively. Results: In 48 cases, 101 costal and costal cartilage fractures were found by 3d display incluld calcified costal cartilage with obvious malposition, and costal fracture with obvious or obscure malpostion. Only 82 costal fracture were found by CR examination. Conclusions: 16-slice spiral CT and 3D display is the best examination in diagnosis of costal and costal cartilage fracture.

  2. Comparison of the Multidetector-row Computed Tomographic Angiography Axial and Coronal Planes' Usefulness for Detecting Thoracodorsal Artery Perforators

    Directory of Open Access Journals (Sweden)

    Jong Gyu Kim

    2012-07-01

    Full Text Available Background During the planning of a thoracodorsal artery perforator (TDAP free flap,preoperative multidetector-row computed tomographic (MDCT angiography is valuablefor predicting the locations of perforators. However, CT-based perforator mapping of thethoracodorsal artery is not easy because of its small diameter. Thus, we evaluated 1-mm-thickMDCT images in multiple planes to search for reliable perforators accurately.Methods Between July 2010 and October 2011, 19 consecutive patients (13 males, 6females who underwent MDCT prior to TDAP free flap operations were enrolled in this study.Patients ranged in age from 10 to 75 years (mean, 39.3 years. MDCT images were acquired ata thickness of 1 mm in the axial, coronal, and sagittal planes.Results The thoracodorsal artery perforators were detected in all 19 cases. The reliableperforators originating from the descending branch were found in 14 cases, of which 6 hadtransverse branches. The former were well identified in the coronal view, and the latter in theaxial view. The location of the most reliable perforators on MDCT images corresponded wellwith the surgical findings.Conclusions Though MDCT has been widely used in performing the abdominal perforatorfree flap for detecting reliable perforating vessels, it is not popular in the TDAP free flap.The results of this study suggest that multiple planes of MDCT may increase the probabilityof detecting the most reliable perforators, along with decreasing the probability of missingavailable vessels.

  3. Assessment of left ventricular volumes using multi-detector row computed tomography (MDCT). Phantom and human studies

    International Nuclear Information System (INIS)

    Multi-detector row CT (MDCT) is a new noninvasive modality for coronary artery imaging. Using the same MDCT data obtained for coronary artery assessment, left ventricular (LV) volumes such as end-diastolic (ED) and end-systolic (ES) volumes (EDV and ESV, respectively) and ejection fraction (EF) can potentially be assessed when ED and ES datasets are extracted. The purpose of this study was to evaluate the feasibility of MDCT in the assessment of LV volumes. Using a pulsating heart phantom (EDV=143 ml, ESV=107 ml, stroke volume=36 ml, EF=25%) and MDCT, EDV and ESV were measured and EF was calculated. Clinical materials consisted of 11 consecutive human subjects who underwent MDCT. MDCT data were acquired during a single breathhold, using an intravenous injection of contrast medium. Left ventriculography (LVG) was performed in all patients as a gold standard. LV-EF was calculated by measuring ESV and EDV in all patients. In the phantom study, LV volumes were: EDV=137 ml, ESV=101 ml, stroke volume=36 ml, and EF=26%. Close correlations were observed between MDCT values and LVG values (EDV: r=0.95, ESV: r=0.98, EF: r=0.93, p<0.001). MDCT was useful for the assessment of LV volumes and EF in various patients with cardiovascular diseases (CVD). (author)

  4. Accuracy of multidetector row computed tomography for the diagnosis of acute bowel ischemia in a non-selected study population

    Energy Technology Data Exchange (ETDEWEB)

    Wiesner, Walter [University Hospital Basel, Institute of Diagnostic Radiology, Basel (Switzerland); Clinic Stephanshorn, Medical Radiology Center, St. Gallen (Switzerland); Hauser, Andreas; Steinbrich, Wolfgang [University Hospital Basel, Institute of Diagnostic Radiology, Basel (Switzerland)

    2004-12-01

    The diagnostic accuracy of multidetector row computed tomography for the prospective diagnosis of acute bowel ischemia in the daily clinical routine was analyzed. Two hundred ninety-one consecutive patients with an acute or subacute abdomen, examined by MDCT over a time period of 5 months, were included in the study. All original CT diagnoses made during the daily routine by radiological generalists were compared to the final diagnoses made by using all available medical information from endoscopies, surgical interventions, autopsies and follow-up. Finally, all CT examinations of patients with an initial CT diagnosis or a final diagnosis of bowel ischemia were reread by a radiologist specialized in abdominal imaging in order to analyze the CT findings and the reasons for initially false negative or false positive CT readings. Twenty-four patients out of 291 (8.2%) had acute bowel ischemia. The age of affected patients ranged from 50 to 94 years (mean age: 75.7 years). Eleven patients were male, and 13 female. Reasons for acute bowel ischemia were: arterio-occlusive (n=11), non-occlusive (n=5), strangulation (n=2), over-distension (n=3) and radiation (n=3). The prospective sensitivity, specificity, PPV and NPV of MDCT for the diagnosis of acute bowel ischemia in the daily routine were 79.17, 98.51, 90.48 and 98.15%. MDCT reaches a similarly high sensitivity in diagnosing acute bowel as angiography. Furthermore, it has the advantage of being helpful in most of its clinical differential diagnoses and of being less invasive with the consecutive possibility of being used earlier in the diagnostic process with all the resulting positive effects on the patients prognosis. Therefore, nowadays MDCT should probably be used as the first step imaging modality of choice in patients with suspected acute bowel ischemia. (orig.)

  5. Diagnostic value of 16-slice spiral CT angiography for pathogenesis of subarachnoid hemorrhage%16层螺旋CT血管成像对蛛网膜下腔出血病因的诊断价值

    Institute of Scientific and Technical Information of China (English)

    叶更新; 周元敏; 康水英

    2015-01-01

    目的:探讨分析16层螺旋CT血管成像对蛛网膜下腔出血(SAH)病因的诊断价值。方法58例蛛网膜下腔出血患者,均先行16层螺旋CT平扫,再行CT血管成像(CTA),之后应用多平面重建、容积再现、最大密度投影等技术,对图像进行处理,观察患者的脑血管情况并对SAH病因进行分析。结果经3D-CTA共发现46例患者有56个动脉瘤、动静脉畸形8例、烟雾病3例、阴性1例;与数字减影血管造影(DSA)或外科手术作为参照,提示3D-CTA诊断颅内动脉瘤的敏感性与特异性分别为97.83%与100.00%。结论16层螺旋CT血管成像在蛛网膜下腔出血的病因诊断中具有较高应用价值,可作为诊断蛛网膜下腔出血病因的首选方法。%Objective To investigate and analyze the diagnostic value of 16-slice spiral CT angiography for pathogenesis of subarachnoid hemorrhage (SAH). Methods A total of 58 patients with SAH received plain scan by 16-slice spiral CT, and then received CT angiography (CTA). Images were processed by multiplanar reconstruction, volume rendering, and maximum intensity projection. Condition of patients’cerebral blood vessel was observed to analysis pathogenesis of SAH. Results After 3D-CTA for the 46 cases, there were 56 cases with arterial aneurysm, 8 cases with arteriovenous malformation, 3 cases with moyamoya disease, and 1 negative case. Comparisons with digital subtraction angiography (DSA) or surgical operation showed the sensibility and specificity of 3D-CTA in diagnosing arterial aneurysm were respectively 97.83% and 100.00%. Conclusion 16-slice spiral CT angiography provides high application value in diagnosis of the pathogenesis of SAH, and it can be taken as the preferred method in diagnosing the pathogenesis of SAH.

  6. Diagnostic Value of 16-slice spiral CT in Sigmoid colon Volvulus%16层螺旋CT在乙状结肠扭转中的诊断价值

    Institute of Scientific and Technical Information of China (English)

    钟晖; 秦旭惠; 王莹

    2012-01-01

      Objective ::To explore the diagnostic value of 16-slice spiral CT conventional scan and its multi-planar reformation(MPR) in sigmoid colon volvulus.. Methods:retrospectively analysed the outcome of 12 case of sigmoid colon Volvulus patients who were diagnosed by 16-slice spiral CT conventional scan and its MPR and proved by clinical operations . Results: Multi-slice CT(MSCT) features of 12 case. including:volvulus with intestinal expanded 、fluid and pneumotosis、 with shapes of U-shaped or capsule strips 12 cases. Whirl pool of intestine and mesenteric whirlpool sign 9 cases 、 Cross sign 7 cases 、Beak sign 12 cases. Abdominal fluid 6 cases. Conclusion:: MSCT conventional scan can quickly show the location degree lesion morphological characterstic of intestinal volvulus ,with or without hemody namic images impairment of bouel wal. 16-slice spiral CT conventional scan and its (MPR) have important value to diagnose sigmoid colon volvulus .%  目的探讨16层螺旋CT在乙状结肠扭转中的诊断价值。方法对经16层螺旋CT平扫及多平面重组(MPR)诊断的12例乙状结肠扭转患者,结合其临床和手术结果进行回顾性分析。结果 CT主要表现有:扭转的肠袢扩张积液积气,呈马蹄形或囊袋状形12例;肠管及系膜漩涡征9例;交叉征7例;鸟喙征12例;腹水6例。结论多层螺旋CT平扫结合MPR能快速显示乙状结肠扭转的部位、程度、形态特征、有无血运障碍等,是诊断乙状结肠扭转非常有价值的检查方法。

  7. Clinical Application of the 16-Slice Spiral CT Testing Scan Technique in Pulmonary Angiography%16层螺旋CT测试扫描技术在肺动脉成像中的临床应用

    Institute of Scientific and Technical Information of China (English)

    邓波红; 张任华; 侯海文; 龙江涛; 彭丹丹

    2014-01-01

    Objective: To explore the Application of the 16-slice spiral CT testing scan technique in pulmonary angiography, in order to improve the quality of CTPA. Methods:50 CTPA in testing scan group and conventional scan group respectively were examined with GE Light speed 16-slice spiral CT. The data of al patients were transmit ed to the workstation (ADW4.2) and reconstruction. The quality of al images were evaluated by three experienced doctors using double-blind method in charge in four grades (A,B,C and bad), and the mean peak time of main Artery of al grade A were also compared. Results:Testing scan:the rate of A,B,C and bad was 90%、6%、4% and 0% respectively. conventional scan: the rate of grade A,B,C and bad was 62%、12%、22% and 4% respectively. Conclusion: Testing scan technique is superior than conventional scan in image quality of 16-slice spiral CT pulmonary angiography . Testing scan technique is good for radiographic diagnosis and remedies.%目的:探讨16层螺旋C T测试扫描技术在肺动脉成像中的应用,以期提高肺动脉造影(CTPA)的图像质量。方法:应用GE Light Speed 16层螺旋CT扫描仪进行测试扫描和传统扫描各50例C T PA,所有扫描重建图像传送至AW4.2工作站进行后处理重组,并分别由3名经验丰富的CT诊断医师采用双盲法,对2种方法的图像质量进行评价,分别统计优、良、可、差。结果:测试扫描:优90%、良6%、可4%、差0%;传统扫描:优62%、良12%、可22%、差4%。结论:应用测试扫描技术进行16层螺旋C T肺动脉成像所得诊断图像质量明显优于传统扫描,有助于放射诊断及治疗。

  8. Clinical application of the tracking scan technique in 16-slice spiral CT angiography%跟踪扫描技术在16层螺旋CT动脉成像中的临床应用

    Institute of Scientific and Technical Information of China (English)

    张任华; 邓波红; 龙江涛; 李强; 杨友; 陈美英

    2009-01-01

    目的 探讨跟踪扫描技术在16层螺旋CT动脉成像中的应用.方法 应用GE LightSpeed 16层螺旋CT扫描仪进行跟踪扫描、测试扫描和估算扫描各100例CTA,所有扫描图像传送至AW4.2工作站进行后处理重建,并分别由3名经验丰富的CT诊断医师采用双盲法对3种方法的图像质量进行评价,分别统计优、良、可、差.结果 跟踪扫描图像质量优级率89.00%、良7.00%、可4.00%、差0;测试扫描优级率70.00%、良11.00%、可15.00%、差4.00%;估算扫描优级率61.00%、良13.00%、可21.00%、差5.00%.结论 应用跟踪扫描技术进行16层螺旋CT动脉成像所得图像质量明显优于测试扫描和估算扫描.%Objective To explore the application of the tracking scan technique in 16-slice spiral CT angiography, in order to improve the quality of CTA. Methods Three hundred patients who were divided into three groups randomly underwent CTA in tracking, testing and estimation scan respectively with GE LightSpeed 16-slice spiral CT. The data of all patients were transmitted to the workstation (AW4.2) and reconstructed. The quality of all images were evaluated by three experienced doctors with double-blind method and divided into four grades (A, B, C and D) from optimal to poor. Results The rate of grade A, B, C and D was 89.00%, 7.00%, 4.00% and 0 respectively for tracking scan, 70.00%, 11.00%, 15.00% and 4.00% respectively for testing scan, while 61.00%, 13.00%, 21.00% and 5.00% respectively for estimation scan. Conclusion Tracking scan technique is superior to testing and estimation scan in image quality of 16-slice spiral CT angiography.

  9. Study on Enhancement Scanning Technology of 16-slice Spiral CT in Upper Abdomen%16排螺旋CT在上腹部增强扫描中的技术探讨

    Institute of Scientific and Technical Information of China (English)

    石银龙

    2011-01-01

    Objective To evaluate the value of 16-slice spiral CT enhancement scanning technology in the upper abdomen. Methods 200 patients were examined by CT in the upper abdomen. Contrast agent was injected through the hand vein at 1.5mL/kg, with pressure of 300 pounds, flow rate 2.5mL/s. Before injection, we must complete the first scanning. Then, other 2 or 3 scanning were done. Results 188 cases can show abdominal aorta, hepatic artery, splenic artery, hilar vessel branches, portal vein, inferior vena cava very well. The others were not ideal because of portal hypertension. Conclusion 1'6 -slice spiral CT enhancement scanning technology in the upper abdomen can obtain good images to meet clinical needs.%目的 探讨16排螺旋CT在上腹部增强扫描技术.方法 对200例患者进行上腹部CT扫描,造影剂按照1.5mL/kg,经手背静脉用高压注射器注射,其压力为300磅,流速2.5mL/s,注药前扫描1次,注药后不同时相扫描2~3次.结果 188例能很好地显示出腹主动脉、肝动脉、脾动脉、肝门区血管分支、门静脉、下腔静脉;10例因门脉高压导致造影结果不理想;2例失败.结论 16排螺旋CT的上腹部增强扫描可获得满意的图像以满足临床需要.

  10. Usefulness and safety of propranolol injection into vein for acquisition of coronary multidetector-row computed tomography

    International Nuclear Information System (INIS)

    A low heart rate (HR), associated with a prolonged slow filling phase (SF), is necessary to obtain a high quality coronary CT at a low radiation dose with conventional 64 multidetector-row computed tomography (MDCT). The purpose of our study was to confirm the safety of injecting propranolol (2-10 mg) into the vein for lowering heart rate in patients requiring MDCT and to document the effect of the drug on HR, PQ and SF. Of 1290 consecutive patients who were initially considered for enrollment in the coronary MDCT study, 40 patients with atrial fibrillations, 3 with atrial flutters, and 13 with artificial pacemakers were excluded. Of the remaining 1234 patients (M/F=714/520), 331 had already taken an oral beta-blocker before the CT examination, and were included in the study. In patients with no contraindications, propranolol was aggressively injected (2-10 mg) into the vein to reduce the HR. In patients not taking an oral beta blocker, 2 mg propranolol reduced the HR by -10±5 bpm and 10 mg, by -20±7 bpm. However, in patients taking an oral beta-blocker, the decrease in HR by propranolol was minimal (2 mg, -6±4 bpm; 10 mg, -10±6 bpm). Propranolol significantly prolonged the PQ interval (from 169±27 to 179±29 ms, P<0.0001), and SF (from 125±69 to 264±79 ms, P<0.0001). Adverse effects of propranolol injection were observed in only 3 [2 mild hypotension and 1 paroxysmal atrial fibrillation (recovered to sinus rhythm by DC counter shock)] of 3212 patients. All 3 patients became stable after 1 or 2 hours of rest and could return home. Propranolol injection was a relatively safe and useful method to reduce HR and prolong SF, necessary for obtaining high quality coronary MDCT with a low radiation dose. (author)

  11. Analysis of clinical application of 16 slice spiral CT in diagnosis and treatment of gastrointestinal diseases%16排螺旋CT在胃肠道疾病诊治中的临床应用分析

    Institute of Scientific and Technical Information of China (English)

    黄伟康; 唐西平; 吴志彬; 李志铭

    2016-01-01

    目的:探讨16排螺旋CT在胃肠道疾病诊断中的临床价值。方法采集本院2014年1月至2015年1月入院经手术治疗的118例包括胃肠道穿孔、肠梗阻、小肠间质瘤、肠扭转、腹内疝、肠系膜血栓、急性阑尾炎、胃癌及其病灶浸润等情况的胃肠道常见病变患者的临床资料进行回顾性分析,118例患者均采用16排螺旋CT在容积扫描后分别进行多平面重建、表面阴影成像、透亮显示图像及CT仿真内窥镜等后处理进行影像诊断设为实验组,并都经过胃肠内镜进行检查对比设为对照组,并将2组的检查结果与手术病理结果进行比较和分析。结果经手术确诊,CT与胃肠内镜在胃肠道疾病检出率上都比较高,在胃肠道穿孔、小肠间质瘤、肠扭转、肠系膜血栓、病灶浸润转移的检出率方面16排螺旋CT较胃肠镜有显著优势,两者差异具有统计学意义(P<0.05);在肠梗阻、腹内疝、急性阑尾炎及胃癌方面的检出率方面差异无统计学意义(P>0.05)。结论16排螺旋CT全腹部扫描对胃肠道疾病的定位和定性诊断具有重要的临床价值。%Objective To investigate the clinical value of 16 slice spiral CT (MSCT) in the diagnosis of gastrointestinal diseases. Methods One hundred and eigteen cases were collected in our hospital from January 2014 to January 2015 after admission in patients with clinical data including gastrointestinal perforation , intestinal obstruction, intestinal stromal tumor, abdominal hernia, volvulus, mesenteric thrombosis, acute appendicitis, gastric cancer and tumor invasion of the gastrointestinal diseases operation in treatment of 118 cases were analyzed retrospectively. All cases were treated by the 16 row spiral CT multiplanar reconstruction, respectively in the volume scanning surface after shadow imaging, bright display images and CT virtual endoscopy and postprocessing for the experimental group for imaging

  12. 16层螺旋CT后处理技术在肋软骨骨折的诊断价值%The Value of 16-slice Helical CT Post Processing Technigue in Diagnosis of Costal Cartilage Fracture

    Institute of Scientific and Technical Information of China (English)

    王维; 段建航; 席德彦; 朱坤

    2013-01-01

    目的:探讨16层螺旋CT及后处理技术在肋软骨骨折诊断中的应用价值。方法对39例共52处肋软骨骨折采用胸部16层螺旋CT及后处理技术检查,并对其后处理成像资料进行对比分析。结果后处理成像发现39例52处肋软骨骨折,平扫仅发现17例22处肋软骨骨折。 CT平扫和后处理成像表现特征为未钙化或钙化肋软骨中断伴明显错位;肋软骨内见低密度线条状影,无明显断端分离错位;肋弓明显变形;肋软骨间融合处分离。结论螺旋CT后处理成像对肋软骨骨折诊断有重要价值。%Objective To investigate the 16-slice spiral CT and post-processing technology in the costal cartilage fracture diagnosis value. Methods 39 cases of 52 costal fractures chest 16-slice spiral CT examination and post-processing techniques, and subsequently processed imaging data were analyzed. Results 39 cases of post-treatment imaging found 52 costal fractures, only 17 cases of unenhanced found 22 costal fractures. CT scan and post-treatment imaging performance characteristics for non-calcified or calcified cartilage disruption with significant dislocation;cartilage were seen in low-density lines like shadow, no obvious stump isolated dislocation;Legong significant deformation;costal interbody fusion at separation. Conclusion Spiral CT postprocessing imaging cartilage fracture diagnosis has important value.

  13. Application of low-dose 16-slice spiral CT scanning technology in adenoidal hypertrophy in children%16层螺旋CT低剂量扫描技术在儿童腺样体肥大中的应用

    Institute of Scientific and Technical Information of China (English)

    党保华; 曲金荣; 张建伟; 刘翠翠; 黎海亮

    2012-01-01

    目的:探讨16层螺旋CT低剂量扫描技术在儿童腺样体肥大的临床应用.方法:对46例临床疑似腺样体肥大儿童行16层螺旋CT低剂量和常规剂量扫描,将其随机分为两组,时比两种剂量扫描的图像质量与患者的辐射剂量.结果:16层螺旋CT低剂量扫描与常规剂量扫描对显示鼻咽部的解剖结构及病变差异无显著性意义(P=0.381).对低剂量组/常规剂量组两组腺样体CT值平均值之间无统计学差异(P=0.256).CT值标准偏差之间无统计学差异(P=0.313).低剂量CT扫描显示儿童鼻咽部扫描参数中CTDIvol为4.35 mGy、DLP为40.62 mGy·cm,常规剂量CTDIvol为8.65 mGy、DLP为81.23 mGy·cm.低剂量与常规剂量相比,其CTDIvol和DLP降低了约50%的辐射剂量.结论:16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16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16层螺旋CT扫描.%Objective:To investigate clinical application value of low-dose 16-slice spiral CT scanning technology in the adenoidal hypertrophy of children. MethodS:46 cases of children with adenoidal hypertrophy underwent low-dose (group A) and conventional-dose (group B) 16-slice spiral CT scanning. The image quality and radiation dose in two groups were compared. Results: The display of the anatomical structure of the nasopharynx and adenoidal hypertrophy showed no significant difference between low-dose CT scanning and conventional-dose CT scanning (P = 0. 381). It showed no significant difference in the mean of CT values (P=0. 256) and the standard deviation of CT values (P=0. 313) between low-dose and conventional-dose scanning. The CTDIvol of low-dose CT scanning was 4. 35mGy,and DLP was40. 62mGy ·cm,and the CTDIvol of conventional doses was 8. 65mGy,DLP was 81. 23mGy-cm. The CTDIvol and DLP of low-dose CT scanning decreased about 50% as compared with those of conventional dose scanning. Conclusion

  14. 16层螺旋CT灌注成像鉴别诊断肺癌与肺良性肿物%Differential diagnosis of 16-slice spiral CT perfusion imaging in lung cancer and pulmonary benign masses

    Institute of Scientific and Technical Information of China (English)

    王海生; 韩艳平

    2014-01-01

    目的:分析16层螺旋CT灌注成像在肺癌及肺良性肿物鉴别诊断中的价值。方法选择60例肺部肿块患者为研究对象,其中肺癌30例,肺良性肿物30例,均接受16层螺旋CT灌注成像扫描,以病理学结果为参照,分析比较肺癌与肺良性肿物病灶血流量(BF)、血容量(BV)、平均通过时间(MTT)及表面渗透性(PS)差异,观察不同参数对肺癌与肺良性肿物诊断的敏感度、特异度及诊断价值。结果肺癌病灶的BF、BV及PS值均显著高于肺良性肿物,MTT显著短于肺良性肿物,差异均有显著性(P<0.05);BF诊断敏感度及特异度最低,漏诊率为18.8%、误诊率为18.3%;BV及MTT诊断敏感度及特异度中等,误诊率分别为10.7%和11.3%,漏诊率分别为9.9%和10.3%;PS诊断敏感度及特异度最高,漏诊率为5.5%、误诊率为9.8%,其参数指标可能是诊断ROC最优指标。结论16层螺旋CT灌注成像有助于肺癌及肺良性肿物的鉴别诊断。%Objective To evaluate the differential diagnostic ability of 16-slice sprial CT perfusion imaging between lung cancer and pulmonary benign masses. Method 60 patients with pulmonary masses as the object of study, included 30 cases of lung cancer, 30 patients with pulmonary benign masses, all underwent 16-slice sprial CT perfu, the pathology results as the reference, analysed and compared of lung cancer and pulmonary benign masses blood lfow (BF), blood volume (BV), mean transit time (MTT) permeability surface (PS) and the numerical differences were observed sensitivity of the different parameters of lung cancer and pulmonary benign masses diagnosis, speciifcity and diagnostic value. Result BF, BV and PS in lung cancer was higher than the value in pulmonary benign masses, MTT was signiifcantly shorter in the pulmonary benign masses, there was signiifcant difference (P < 0.05). BF diagnostic sensitivity and speciifcity of the lowest rate was 18

  15. Research of 16-slice CT in the Double Low Dose Renal Artery Imaging%16层CT双低剂量肾动脉成像研究

    Institute of Scientific and Technical Information of China (English)

    邓义; 何上青; 欧阳中敏; 罗锦文; 刘玉新; 杨壁然; 周传仁; 唐亚霞; 陈旭荣; 李小瑛

    2014-01-01

    Objective To investigate the feasibility of the double low dose (low dose contrast agent and low X -ray radiation) CT re-nalarteriesimaging.Methods 36caseswithclinicallysuspectedrenalarterydiseasewererandomlydividedintothreegroups,withevery 13 cases in the conventional dose group , double low -dose group A and double low -dose group B.Double low -dose group A:320 mgI/mL ioversol 0.8 mL/kg, 120 kV, automatic mA, SD15 ); double low -dose group B: 320 mgI/mL ioversol 0.8 mL/kg, 120 kV, automatic mA, SD20 );conventional dose group:300 mgI/mL iohexol 1.3 mL/kg, 120 kV, automatic mA, SD10).Other scan parameters are consistent , with 3.5 mL/s injection rate.The original thin slice images were transferred to the Vitrea workstation for post processing, to restructure MIP, VR image, the axial images and reformatted images sent to the NFPACS.Cases were recorded in each volume CT dose index (CTDIvol).SPSS16.0 was used for statistical analysis.Results The CTDIvol of group A and B group were 65%and 43%of the conventional dose group respectively.Effective iodine consumption of per kilogram body weight was obviously reduced , which were 66%of the conventional dose group.The main renal artery and the first branches showed no statistically significant difference among the groups.Double low dose group A for renal artery main branches and second branches showed good result .Double low-dose group B for secondary renal artery branches showed poor result.Conclusion Double low dose group A image meets the needs of clinical diagnosis.Low dose contrast agent combined with low dose of radiation ( double low dose ) CT renal artery imaging is feasible.%目的:探讨低剂量对比剂联合低辐射剂量(双低剂量) CT肾动脉成像的可行性。方法将36例临床疑有肾动脉病变的患者随机分为3组:常规剂量组、双低剂量A组和双低剂量B组,每组各12例。双低剂量A组:320 mgI/mL碘佛醇0.8 mL/kg ,120 kV,自动毫安,SD15

  16. Common breakdown maintenance of GE light speed 16-slice Helical CT%GE light speed 16排螺旋CT常见故障的维修和体会

    Institute of Scientific and Technical Information of China (English)

    苏根元; 王萍萍; 于小晶

    2011-01-01

    Recently,with the extensive application of multi-slice Helical CT,all sorts of failure have been encountered in practice.On the basis of mastering basic principal and structure of multi-slice Helical CT,and relevant knowledge of computer,many breakdowns may be quickly resolved.It has greatly improved the efficiency of equipments and ensured daily operations.This paper briefly describes common breakdown of GE light speed 16-slice Helical CT in our hospital,and summarizes diagnostic analysis,solution and experience.It can serve as reference for concerned personnel.%多排螺旋CT目前已广泛应用于临床,使用过程中会遇到各种各样故障,在熟练掌握多排螺旋CT的基本原理,工作结构,及相关计算机知识的基础上,可以对多排螺旋CT机很多常见故障进行快速及时修复,大大提高了设备使用率,保证临床工作的顺利进行。本文简要阐述了我院GE light speed 16排螺旋CT在使用过程中常见的故障现象、诊断分析、解决方法和体会。为相关专业技术人员提供一定的参考和借鉴。

  17. Application of 16-slice spiral CT and three-dimensional display in diagnosis of costal cartilage fracture%16排螺旋CT及三维成像诊断肋软骨骨折的临床应用

    Institute of Scientific and Technical Information of China (English)

    吴天文

    2011-01-01

    Objective To evaluate the value of 16-slice spiral CT and three-dimensional display on the diagnosis of costal cartilage fracture.Methods The review analysis 46 example altogether 58 costal cartilage bone fracture case,uses the screw CT volume scanning and the.three dimensional image formation technological audiL the choice multilevel reorganizes(MPR)and the volume reappears(VR)2 to plant the image formation,and carries Oil the eontrastive analysis to its phantom material.Results In 46 eases.58 costal cartilage fractures were found by three-dimensional display,but only 22 fractures in 15 cases were found by 16-stice spiral CT original scanning image.CT sweeps evenly with the three dimensional image formation performance characteristic for the costal cartilage bureau stove break,the costal cartilage edge discontinuity or sees the translucent crack,the costal cartilage smashing.the calcification costal cartilage has the obvious dislocation.the calcification costal cartilage has not had obvious or not the obvious dislocation..Conclusion Application of 16-slice spiral CT and three-dimensional display is of great value in diagnosis of costal cartilage fracture.May as the diagnosis costal cartilage bone fracture fast choice method.%目的 探讨16排螺旋CT及三维成像在肋软骨骨折诊断中的应用价值.方法 回顾性分析46例共58处肋软骨骨折病例,采用螺旋CT容积扫描及三维成像技术检查,选择多平面重组(MPR)和容积再现(VR)2种成像,并对其影像资料进行对比分析.结果 三维成像发现46例58处肋软骨骨折,平扫仅发现15例22处肋软骨骨折.CT平扫和三维成像表现特征为肋软骨局灶性断裂、肋软骨边缘连续性中断或见透亮裂纹、肋软骨粉碎,钙化的肋软骨均有明显错位,未钙化的肋软骨有明显或不明显错位.结论 16排螺旋CT及三维成像对肋软骨骨折诊断有重要价值,可作为诊断肋软骨骨折的首选方法.

  18. Multidetector row computed tomography may accurately estimate plaque vulnerability. Does MDCT accurately estimate plaque vulnerability? (Pro)

    International Nuclear Information System (INIS)

    Over the past decade, multidetector row computed tomography (MDCT) has become the most reliable and established of the noninvasive examination techniques for detecting coronary heart disease. Now MDCT is chasing intravascular ultrasound (IVUS) in terms of spatial resolution. Among the components of vulnerable plaque, MDCT may detect lipid-rich plaque, the lipid pool, and calcified spots using computed tomography number. Plaque components are detected by MDCT with high accuracy compared with IVUS and angioscopy when assessing vulnerable plaque. The TWINS study and TOGETHAR trial demonstrated that angioscopic loss of yellow color occurred independently of volumetric plaque change by statin therapy. These 2 studies showed that plaque stabilization and regression reflect independent processes mediated by different mechanisms and time course. Noncalcified plaque and/or low-density plaque was found to be the strongest predictor of cardiac events, regardless of lesion severity, and act as a potential marker of plaque vulnerability. MDCT may be an effective tool for early triage of patients with chest pain who have a normal electrocardiogram (ECG) and cardiac enzymes in the emergency department. MDCT has the potential ability to analyze coronary plaque quantitatively and qualitatively if some problems are resolved. MDCT may become an essential tool for detecting and preventing coronary artery disease in the future. (author)

  19. ECG-Edit function in multidetector-row computed tomography coronary arteriography for patients with arrhythmias

    International Nuclear Information System (INIS)

    Electrocardiogram (ECG)-gating is necessary for cardiac computed tomography, but is not suitable for arrhythmias, so the aim of this study was to evaluate the usefulness of the ECG-edit function for this purpose. Of 1,221 patients undergoing 64-row multidetector-row computed tomography coronary angiography (coronary MDCT), 123 patients (28 atrial fibrillation (Af), 39 premature atrial contractions (PAC), 42 premature ventricular contractions (PVC), 3 PAC+PVC, 10 sinus arrhythmias (SA), and a second-degree atrioventricular block (2deg AVB)) had arrhythmias necessitating the ECG-edit function. Short R-R interval was deleted and mid-diastolic phases were selected from the long R-R intervals using the ''R+absolute time'' method. In the present study, the reconstructed images were evaluated using a triple-grade scale A-C, representing excellent, acceptable, and unacceptable image quality. Image quality, categorized as A, B and C, respectively, was 50%, 36% and 14% for the 28 patients with Af; 56%, 36% and 8% for the 39 PAC patients, and 65%, 33% and 2% in the 42 PVC patients. None of the scans of the PAC+PVC, SA, and 2deg AVB patients was ranked as C. The ECG-edit function is useful for reconstructing coronary MDCT images in many arrhythmias, and provides clinically acceptable images in most cases. (author)

  20. 16排螺旋 CT 扫描并 MPR 在孤立性肺结节影像诊断中的价值%The diagnostic value of using 16-slice spiral CT scan and MPR on solitary pulmonary nodules

    Institute of Scientific and Technical Information of China (English)

    李权灵

    2015-01-01

    Objective To evaluate the diagnostic value of using 16-slice spiral CT scan and Multi-planar re-construction(MPR) on solitary pulmonary nodules(SPN).Methods 21 patients with small peripheral lung cancer and 29 patients with benign SPN were confirmed by pathology and analyzed retrospectively using CT imaging data .All patients underwent 16-slice spiral CT volume scanning and MPR .Results MPR images could display more special features of lesions than conventional transverse scanning , such as pleural indentation , vascular bundle , small calcifi-cation, spicule sign, vacuole sign, spinous protuberance etc .Conclusion 16-slice spiral CT scan and MPR shows more signs of SPN than conventional transverse scanning .It is valuable to use this technique to scan SPN and distin-guish between benign and malignant lung tumors .%目的:探讨16排螺旋CT扫描并多平面重建( MPR )在孤立性肺结节( SPN )影像诊断中的价值。方法回顾性分析经病理证实的周围型小肺癌21例和良性SPN 29例的CT影像资料,所有患者均行16排螺旋CT容积扫描并MPR。结果 MPR图像比常规横断位扫描更能显示病灶的特殊征象,如胸膜凹陷、血管集束、小钙化、毛刺征、空泡征、棘状突起等。结论16排螺旋CT扫描并MPR发现SPN的特殊征象更多,对区分SPN的良恶性具有重要价值。

  1. 16-Slice CT Diagnostic Value in Adult Non- traumatic Abdominal Wall Hernia%成人非创伤性腹壁疝的16层螺旋CT诊断价值

    Institute of Scientific and Technical Information of China (English)

    丁长青; 孙迎迎; 史志卫; 王文生; 谢光彤

    2012-01-01

    目的:探讨成人非创伤性腹壁疝的16层螺旋CT诊断价值。方法:回顾性分析手术或临床随访证实的37例成人非创伤性腹壁疝16层螺旋CT资料。结果:腹壁切口疝13例,股沟斜疝10例,腰疝4例,半月线疝3例,壁造瘘口疝3例,白线疝2例,脐疝2例。疝囊直径小于5cm者23例,6~10cm者11例,大于10cm者3例。疝内容可为大网膜、肠管甚至邻近的器官。结论:多层CT及后处理是非创伤性腹壁疝较佳的诊断方法,可为进一步手术治疗提供可靠依据。%Objective: To investigate 16 layer spiral CT diagnosis value in adult non traumatic abdominal wall hernia. Methods: A retrospective analysis of 37 cases data of adult non traumatic abdominal wall hernia confirmed by operation or clinical follow-up with 16 slice spiral CT. Results: Abdominal wall incisional hernia in 13 cases, inguinal indirect hernia in 10 cases, lumbar hernia in 4 cases, spigelian hernia in 3 cases, abdominal wall stoma hernia in 3 cases, white line hernia in 2 cases, umbilical hernia in 2 cases. Hernia sac diameter less than 5 cm in 23 cases, 6-10 cm in 11 cases, greater than 10 cm in 3 cases. The hernial contents are the greater omentum, bowel and adjacent organs. Conclusion: It is a better diagnosis method with multi-layer CT and post-processing for non traumatic abdominal wall hernia, which could provide a reliable basis for further treatment.

  2. Quantitative assessment of lung volumes using multi-detector row computed tomography (MDCT) in patients with chronic obstructive pulmonary disease (COPD)

    International Nuclear Information System (INIS)

    To evaluate the clinical value of the multi-detector row computed tomography (MDCT) in the quantitative assessment of lung volumes and to assess the relationship between the MDCT results and disease severity as determined by a pulmonary function test (PFT) in Chronic Obstructive Pulmonary Disease (COPD) patients. We performed a PFT and MDCT on 39 COPD patients. Using the GOLD classifications, we divided the patients into three groups according to disease severity; stage I (mild, n = 10), stage II (moderate, n = 15), and stage III (severe, n = 14). Using the pulmo-CT software program, we measured the proportion of lung volumes with attenuation values below -910 and -950 HU. The mean FEV1 (% of predicted) and FEV1/FVC was 82.2 ± 2% and 66.2 ± 3% in stage I, 53.5 ± 11% and 52 ± 6% in stage II, and 32.3 ± 7% and 44.2% ± 13% in stage III, respectively. Differences in lung volume percentage at each of the thresholds (-910 and -950 HU) among the 3 stages were statistically significant (ρ < 0.01, ρ < 0.01) and correlated well with the FEV1 and FEV1/FVC (r = -0.803, r -0.766, r = -0.817, and r = -0.795, respectively). The volumetric measurement obtained by MDCT provides an accurate means of quantifying pulmonary emphysema

  3. A new acquisition method with pacemaker resetting of coronary multidetector-row computed tomography for reduction of radiation dose in patients with pacemaker

    International Nuclear Information System (INIS)

    We proposed a new acquisition method of coronary multidetector-row CT (MDCT) achieved by pacing rate resetting and/or propranolol or verapamil injection in patients with a pacemaker. Coronary MDCT was undertaken in 57 patients with a pacemaker (DDD: 51, VVI: 6) and in 2975 patients with sinus rhythm as control using Aquilion 64 (Toshiba). Pacing rate was reset to 60 beats per minute (bpm) in DDD, and spontaneous beats were suppressed by propranolol injection. Pacing rate was reset to 70 bpm in atrial fibrillation with VVI, and spontaneous beats were suppressed by verapamil injection. Coronary MDCT was undertaken using as high a beam pitch (BP) as possible. When spontaneous beats were not suppressed, we selected the optimal gantry speed and BP to get the highest temporal resolution. Image quality makes no significant difference between pacemaker and sinus rhythm. When spontaneous beats were completely suppressed (all pacing), mean radiation dose and acquisition time, respectively, decreased by 33.0% and 35.2% in DDD compared with the method recommended by Heart Navi (by Toshiba), and they decreased by 38.1% and 25.9%, respectively, in VVI compared with the method recommended by Heart Navi. We could not estimate coronary stenosis in the proximal right coronary artery by lead artifacts in 30% of DDD pacemakers. In conclusion, the new method is useful for not only reducing radiation dose and acquisition time, but also for maintaining image quality in patients with a pacemaker. (author)

  4. Quantitative assessment of lung volumes using multi-detector row computed tomography (MDCT) in patients with chronic obstructive pulmonary disease (COPD)

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Sang Min; Hur, Jin; Kim, Tae Hoon; Kim, Sang Jin; Kim, Hyung Jung [Yonsei University College of Medicine, Seoul (Korea, Republic of)

    2008-08-15

    To evaluate the clinical value of the multi-detector row computed tomography (MDCT) in the quantitative assessment of lung volumes and to assess the relationship between the MDCT results and disease severity as determined by a pulmonary function test (PFT) in Chronic Obstructive Pulmonary Disease (COPD) patients. We performed a PFT and MDCT on 39 COPD patients. Using the GOLD classifications, we divided the patients into three groups according to disease severity; stage I (mild, n = 10), stage II (moderate, n = 15), and stage III (severe, n = 14). Using the pulmo-CT software program, we measured the proportion of lung volumes with attenuation values below -910 and -950 HU. The mean FEV1 (% of predicted) and FEV1/FVC was 82.2 {+-} 2% and 66.2 {+-} 3% in stage I, 53.5 {+-} 11% and 52 {+-} 6% in stage II, and 32.3 {+-} 7% and 44.2% {+-} 13% in stage III, respectively. Differences in lung volume percentage at each of the thresholds (-910 and -950 HU) among the 3 stages were statistically significant ({rho} < 0.01, {rho} < 0.01) and correlated well with the FEV1 and FEV1/FVC (r = -0.803, r -0.766, r = -0.817, and r = -0.795, respectively). The volumetric measurement obtained by MDCT provides an accurate means of quantifying pulmonary emphysema.

  5. The value of multidetector-row computed tomography for localization of obscure acute gastrointestinal bleeding

    Energy Technology Data Exchange (ETDEWEB)

    Chang, Wei-Chou [Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Tsai, Shih-Hung [Department of Emergency Medicine, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Chang, Wei-Kuo [Division of Gasteroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Liu, Chang-Hsien [Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Tung, Ho-Jui [Department of Healthcare Administration, Asia University, Taichung, Taiwan (China); Hsieh, Chung-Bao [Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Huang, Guo-Shu; Hsu, Hsian-He [Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China); Yu, Chih-Yung, E-mail: chougo2002@yahoo.com.tw [Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan (China)

    2011-11-15

    Purpose: There are no simple guidelines on when to perform multidetector-row computed tomography (MDCT) for diagnosis of obscure acute gastrointestinal bleeding (AGIB). We used a risk scoring system to evaluate the diagnostic power of MDCT for patients with obscure AGIB. Materials and methods: Ninety-two patients with obscure AGIB who were referred for an MDCT scan after unsuccessful endoscopic treatment at presentation were studied. We recorded clinical data and calculated Blatchford score for each patient. Patients who required transfusion more than 500 mL of blood to maintain the vital signs were classified as high-risk patients. Two radiologists independently reviewed and categorized MDCT signs of obscure AGIB. Discordant findings were resolved by consensus. One-way ANOVA was used to compare clinical data between two groups; kappa statistics were used to estimate agreement on MDCT findings between radiologists. Results: Of the 92 patients, 62 (67.4%) were classified as high-risk patients. Blatchford scores of high-risk patients were significantly greater than those of low-risk patients. Sensitivity for MDCT diagnosing obscure AGIB was 81% in high-risk patients, as compared with 50% in the low-risk. When used in conjunction with selection of the cut-off value of 13 in Blatchford scoring system, the sensitivity and specificity of MDCT were 70.9% and 73.7%, respectively. Contrast extravasation was the most specific sign of AGIB (k = .87), recognition of which would have improved diagnostic accuracy. Conclusions: With the aid of Blatchford scoring system for evaluating the disease severity, MDCT can localize the bleeders of obscure AGIB more efficiently.

  6. 64排探测器CT冠状动脉成像对心肌桥伴冠心病的诊断价值探讨%Diagnositic value of 64 multi-detector rows CT coronary angiography in myocardial bridge and coronal artery disease

    Institute of Scientific and Technical Information of China (English)

    刘静; 周茂义; 杨春波; 李立新; 赵兴圣; 岳奎涛; 邵伟光

    2009-01-01

    目的:探讨64排探测器CT(MDCT)对心肌桥伴冠心病的诊断价值及临床意义.方法:对217例拟诊冠心病(CAD)患者行64MDCT冠状动脉血管成像(CCTA),根据CCTA上冠状动脉的走行部位,诊断47例心肌桥,测最心肌桥的长度、厚度,分析各支粥样斑块性质和狭窄程度,判断血管硬化与心肌桥的关系.结果:64MDCTA发现心肌桥51处/47例,检出率为21.66%;34例位于左前降支中段(66.67%),肌桥长度为5.6~27.6 mm;厚度为0.52~4.8mm;其中22例伴有不同程度的粥样硬化斑块,管腔狭窄<50%者19例.结论:64MDCT冠脉成像可无创性检出心肌桥,显示其MDCT表现特点、邻近血管硬化狭窄等,可为临床治疗提供有价值的信息.

  7. 心肌桥伴冠心病的64排探测器CT诊断及临床意义%Clinical Significance of 64 Multi-Detector Rows CT Coronary Angiography in Diagnosing Myocardial Bridge and Coronal Artery Disease

    Institute of Scientific and Technical Information of China (English)

    刘静; 周茂义; 杨春波; 李丽新; 赵兴圣; 邵伟光; 岳奎涛

    2008-01-01

    目的 探讨64排螺旋CT(MDCT)对心肌桥的诊断价值及与冠状动脉硬化的关系.方法 对217例拟诊冠心病(CAD)者行64MDCT冠状动脉血管成像(CCTA),采用回顾性心电门控扫描,获取最大密度投影、曲面重组、容积重组图像,诊断51处/47例心肌桥.测量肌桥的长度、厚度,分析各支粥样斑块性质和狭窄程度,判断血管硬化与心肌桥的关系.纳果 64MDCTA发现心肌桥51处/47例检出率为21.66%;肌桥位于左前降支者66.67%(34/51),心肌桥长度为5.6~27.6(15.3±8.6)mm;厚度为0.52~4.8(1.8±1.3)mm;22例可见血管硬化并狭窄征象,其中发生于前降支中段的34处中,13例近段管腔伴有不同程度的粥样硬化斑块和狭窄,管腔狭窄<50%者11例(32.35%),>50%2例.结论 64排螺旋CT冠状动脉血管成像无创性诊断心肌桥和壁冠状动脉,还可显示壁冠状动脉有无硬化狭窄,可为临床提供心肌缺血的原因和为治疗提供更具价值的信息.

  8. Intensive-care unit lung infections: The role of imaging with special emphasis on multi-detector row computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Romano, Luigia; Pinto, Antonio; Merola, Stefanella; Gagliardi, Nicola; Tortora, Giovanni [Department of Diagnostic Imaging, Cardarelli Hospital, Naples Italy-Via G. Merliani 31, 80127 Naples (Italy); Scaglione, Mariano [Department of Diagnostic Imaging, Cardarelli Hospital, Naples Italy-Via G. Merliani 31, 80127 Naples (Italy)], E-mail: mscaglione@tiscali.it

    2008-03-15

    Nosocomial pneumonia is the most frequent hospital-acquired infection. In mechanically ventilated patients admitted to an intensive-care unit as many as 7-41% may develop pneumonia. The role of imaging is to identify the presence, location and extent of pulmonary infection and the presence of complications. However, the poor resolution of bedside plain film frequently limits the value of radiography as an accurate diagnostic tool. To date, multi-detector row computed tomography with its excellent contrast resolution is the most sensitive modality for evaluating lung parenchyma infections.

  9. Analysis of 16-Slice Spiral CT Perfusion Imaging in Lung Cancer and Benign Lung Tumor Differential Diagnosis Value%肺良恶性结节或肿块CT灌注研究

    Institute of Scientific and Technical Information of China (English)

    陈丽英

    2014-01-01

    Objective To Explore different benign and malignant pulmonary nodules or masses on CT perfusion characteristics, improve the level of differential diagnosis. Methods 110 cases of patients with lung diseases were retrospectively analyzed from May 2007 to May 2013 in our hospital, of whom were 50 cases of patients with lung cancer and 60 cases of patients with benign lung tumor. The two groups of patients lungs were scanned by applying PHILIPS BRILLIANCE 16-slice spiral CT and general of perfusion were analyzed by using CT perfusion pattern software package, and lesions perfusion values (PV), blood volume (BV), maximum enhancement value (PEI) and the time to peak (TTP) were measured and recorded. Results (1) There was statistically significant of PV, PEI and BV values between the highly-differentiated lung cancer group (n=24) and low, undifferentiated lung cancer group (n=26), but there was no significant difference of TTP between the two groups (P>0.05). (2) The differences of PV and PEI value were statistically significant between benign lung tumor group (n=60) and lung cancer (n=50) (P0.05); (3) squamous cell carcinoma group (n=28) and lung adenocarcinoma (n=22) PV, PEI , BV and TTP, the difference was not statistically significant (P>0.05);(4) central lung cancer group (n=21) and peripheral lung cancer group (n=29) PV, PEI, BV and TTP compared the difference was not statistically significant (P>0.05). Conclusion 16-slice spiral CT perfusion imaging can quantitatively reflect lung tumor blood supply relevant information, in favor of lung cancer and benign pulmonary nodules or lumps in the differential diagnosis in the differential diagnosis of higher value, worthy of promotion and application.%目的:探讨肺内不同良恶性结节或肿块的CT灌注特点,提高鉴别诊断水平。方法回顾性分析了2007年5月至2013年5月入住我院的110例肺部病变患者的临床资料,其中肺癌50例,肺良性肿物60例。应用PHILIPS BRILLIANCE 16

  10. Anatomical variation of thyroid veins on contrast-enhanced multi-detector row computed tomography

    International Nuclear Information System (INIS)

    Highlights: • This is the first study to demonstrate the anatomy of thyroid veins on contrasted-enhanced MDCT. • Identifying the thyroid vein on MDCT prior to selective venous sampling of parathyroid hormone provides clinical information to interventional radiologist. • Detecting especially the inferior thyroid veins with individual variability in numbers, locations, and lengths may have an effect on SVS for HPT and decrease the difficulty and time of the procedure. - Abstract: Objective: The objective of this study was to clarify the anatomical variation of thyroid veins into the systemic vein using contrast-enhanced multi-detector row computed tomography (MDCT). Design and methods: : The subjects were 80 patients (34 males and 46 females; mean age, 50.1 years; age range, 15–92 years) with neck diseases who underwent MDCT. The number and location of inflow points of the thyroid veins into the systemic vein, and the length from the junction of bilateral brachiocephalic veins to the orifice of inferior thyroid vein were investigated by reviewing the axial and coronal images. Results: All superior thyroid veins were detected. Right and left middle thyroid veins were identified in 39 and 29 patients, respectively. Right inferior thyroid veins, left inferior thyroid veins, and common trunks were detected in 43, 46, and 39 patients, respectively; in five patients, two left thyroid veins were identified. All left inferior thyroid veins and 34 common trunks flowed into the innominate vein, while right ones had some variations in inflow sites. Mean lengths were 3.01 ± 1.30 cm (range, 0.5–6.19) and 2.04 ± 0.91 cm (0.5–4.4) in the left inferior thyroid vein and common trunk, and 1.96 ± 1.05 cm (0.81–4.8) and 1.65 ± 0.69 cm (0.63–2.94) in the right one flowing into the right internal jugular vein and the innominate vein, respectively. Conclusions: The numbers and orifices of thyroid veins were identified at high rates on contrast-enhanced MDCT. This strategy can provide anatomical information before selective venous sampling for measurements of parathyroid hormone

  11. Anatomical variation of thyroid veins on contrast-enhanced multi-detector row computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Tomita, Hayato, E-mail: m04149@yahoo.co.jp [Department of Radiology, St. Marianna University School of Medicine, Yokohama City Seibu Hospital, 1197-1 Yasashicho, Asahi-ku, Yokohama, Kanagawa 241-0811 (Japan); Yamada, Takayuki; Murakami, Kenji; Hashimoto, Kazuki; Tazawa, Yoko; Kumano, Reiko [Department of Radiology, St. Marianna University School of Medicine, Yokohama City Seibu Hospital, 1197-1 Yasashicho, Asahi-ku, Yokohama, Kanagawa 241-0811 (Japan); Nakajima, Yasuo [Department of Radiology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511 (Japan)

    2015-05-15

    Highlights: • This is the first study to demonstrate the anatomy of thyroid veins on contrasted-enhanced MDCT. • Identifying the thyroid vein on MDCT prior to selective venous sampling of parathyroid hormone provides clinical information to interventional radiologist. • Detecting especially the inferior thyroid veins with individual variability in numbers, locations, and lengths may have an effect on SVS for HPT and decrease the difficulty and time of the procedure. - Abstract: Objective: The objective of this study was to clarify the anatomical variation of thyroid veins into the systemic vein using contrast-enhanced multi-detector row computed tomography (MDCT). Design and methods: : The subjects were 80 patients (34 males and 46 females; mean age, 50.1 years; age range, 15–92 years) with neck diseases who underwent MDCT. The number and location of inflow points of the thyroid veins into the systemic vein, and the length from the junction of bilateral brachiocephalic veins to the orifice of inferior thyroid vein were investigated by reviewing the axial and coronal images. Results: All superior thyroid veins were detected. Right and left middle thyroid veins were identified in 39 and 29 patients, respectively. Right inferior thyroid veins, left inferior thyroid veins, and common trunks were detected in 43, 46, and 39 patients, respectively; in five patients, two left thyroid veins were identified. All left inferior thyroid veins and 34 common trunks flowed into the innominate vein, while right ones had some variations in inflow sites. Mean lengths were 3.01 ± 1.30 cm (range, 0.5–6.19) and 2.04 ± 0.91 cm (0.5–4.4) in the left inferior thyroid vein and common trunk, and 1.96 ± 1.05 cm (0.81–4.8) and 1.65 ± 0.69 cm (0.63–2.94) in the right one flowing into the right internal jugular vein and the innominate vein, respectively. Conclusions: The numbers and orifices of thyroid veins were identified at high rates on contrast-enhanced MDCT. This strategy can provide anatomical information before selective venous sampling for measurements of parathyroid hormone.

  12. Related issues research on the application of high pressure injector in 16 slice spiral CT enhanced scanning%16层螺旋CT增强扫描中应用高压注射器的相关问题研究

    Institute of Scientific and Technical Information of China (English)

    鲁万鑫

    2015-01-01

    目的:探讨高压注射器在16层螺旋CT增强扫描中的应用效果。方法:收治患者120例,分别接受16层螺旋CT扫描和MRI(磁共振成像),根据成像方式的不同分为CT组和MRI组各60例。CT组应用高压注射器注射造影剂增强扫描,MRI组不使用,比较两组的诊断效果。结果:CT组确诊率96.67%,明显高于MRI组的86.67%(P<0.05)。结论:高压注射器应用于16层螺旋CT增强扫描中,能够有效提高诊断效果。%Objective:To explore the application effect of high pressure injector in 16 slice spiral CT enhanced scanning.Methods:120 patients were selected,and they underwent 16 slice spiral CT scanning and MRI(nuclear magnetic resonance imaging) respectively.According to the different imaging modalities,they were divided into CT group and MRI group with 60 cases in each. The patients in the CT group were given high pressure syringe injection contrast enhanced scan,and the patients in the MRI group were not used.We compared the diagnostic results of the two groups.Results:In the CT group,the diagnosis rate of 96.67% was significantly higher than 86.67% in the MRI group(P<0.05).Conclusion:The high pressure injector was applied to the 16 slice spiral CT enhanced scanning,which can effectively improve the diagnostic effect.

  13. [The features of adults' coronary artery anomalies shown by 64-multi-detector rows CT].

    Science.gov (United States)

    Yuan, Zhentuan; Yu, Jianqun; Zhang, Youyi; Yuan, Hongmei

    2009-06-01

    To analyze the adults' coronary artery anomalies revealed by 64-MDCT, we retrospectively analyzed 34 cases of coronary artery anomalies (26 males and 8 females, averagely aged 53. 4 years with a range from 30 to 72 years). Multi-plannar reconstruction (MPR), maximum intensity projection (MIP), surface shadow display (SSD) and volume rendering (VR) were used to demonstrate the anomalous coronary artery. We found 4 cases of RCA from the left coronary sinus, 8 cases with secondary RCA, 1 case with high locations of left main (LM) segments from left sinus of valves, 1 case with LAD originated from main pulmonary artery, 3 cases with separate origin of LAD and LCX. Ten cases with myocardial bridge were shown (9 cases in LAD, 1 case in LCX); coronary fistula was seen in 2 cases (one was RCA-RA fistula, another was LAD-RV fistula), coronary aneurysm was found in 2 cases. Three cases in RCA were short and small. In conclusion, 64-MDCT is a good choice for diagnosing the anomalous coronary artery. PMID:19634659

  14. Low-dose multidetector-row CT-angiography of abdominal aortic aneurysm after endovascular repair

    Energy Technology Data Exchange (ETDEWEB)

    Iezzi, R., E-mail: iezzir@virgilio.it [Department of Bioimaging and Radiological Sciences, Institute of Radiology, ' A. Gemelli' Hospital - Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Department of Clinical Science and Bioimaging, Section of Radiology, University ' G. D' Annunzio' , Chieti (Italy); Cotroneo, A.R.; Giammarino, A. [Department of Clinical Science and Bioimaging, Section of Radiology, University ' G. D' Annunzio' , Chieti (Italy); Spigonardo, F. [Department of Vascular Surgery, University ' G. D' Annunzio' , Chieti (Italy); Storto, M.L. [Department of Clinical Science and Bioimaging, Section of Radiology, University ' G. D' Annunzio' , Chieti (Italy)

    2011-07-15

    Purpose: To investigate the possibility of reducing radiation dose exposure while maintaining image quality using multidetector computed tomography angiography (MDCTA) with high-concentration contrast media in patients undergoing follow-up after endovascular aortic repair (EVAR) to treat abdominal aortic aneurysm. Materials and methods: In this prospective, single center, intra-individual study, patients underwent two consecutive MDCTA scans 6 months apart, one with a standard acquisition protocol (130 mAs/120 kV) and 120 mL of iomeprol 300, and one using a low dose protocol (100 mAs/80 kV) and 90 mL of iomeprol 400. Images acquired during the arterial phase of contrast enhancement were evaluated both qualitatively and quantitatively for image noise and intraluminal contrast enhancement. Results: Thirty adult patients were prospectively enrolled. Statistically significantly higher attenuation values were measured in the low-dose acquisition protocol compared to the standard protocol, from the suprarenal abdominal aorta to the common femoral artery (p < 0.0001; all vascular segments). Qualitatively, image quality was judged significantly (p = 0.0002) better with the standard protocol than with the low-dose protocol. However, no significant differences were found between the two protocols in terms of contrast-to-noise ratio (CNR) (13.63 {+-} 6.97 vs. 11.48 {+-} 8.13; p = 0.1058). An overall dose reduction of up to 74% was observed for the low-dose protocol compared with the standard protocol. Conclusion: In repeat follow-up examinations of patients undergoing EVAR for abdominal aortic aneurysm, a low-dose radiation exposure acquisition protocol provides substantially reduced radiation exposure while maintaining a constant CNR and good image quality.

  15. Accuracy of intermediate dose of furosemide injection to improve multidetector row CT urography

    Energy Technology Data Exchange (ETDEWEB)

    Roy, Catherine [Department of Radiology B, Universitary Hospital of Strasbourg-Civil Hospital, 1, Place de l' hopital BP 426, 67091 Strasbourg Cedex (France)], E-mail: catherine.roy@chru-strasbourg.fr; Jeantroux, Jeremy; Irani, Farah G.; Sauer, Benoit [Department of Radiology B, Universitary Hospital of Strasbourg-Civil Hospital, 1, Place de l' hopital BP 426, 67091 Strasbourg Cedex (France); Lang, Herve; Saussine, Christian [Department of Urology, Universitary Hospital of Strasbourg-Civil Hospital, 1, Place de l' hopital BP 426, 67091 Strasbourg Cedex (France)

    2008-05-15

    Objective: Evaluate the usefulness of intermediate dose furosemide to improve visualization of the intrarenal collecting system and ureter using MDCTU. Materials and methods: Two groups of 100 patients without urinary tract disease or major abdominal pathology underwent MDCTU. Group I (various abdominal indications) was performed without any additional preparation and Group II (suspicion of urinary tract disease) 10 min after injection of furosemide (20 mg). MIP images of the excretory phase were post-processed. Maximal short-axis diameter of the pelvis and ureter were measured on axial images for all phases. Visualization of the collecting system wall and the identification of the whole ureter were assessed. Results: Mean pelvic diameter before contrast was (7.4 mm, S.D. {+-} 2.7; 13.4 mm, S.D. {+-} 4.1), on cortico-medullary phase (8.4 mm, S.D. {+-} 4.2; 14.3 mm, S.D. {+-} 4), on nephrographic phase (8.1 mm, S.D. {+-} 2.5; 14.8 mm, S.D. {+-} 4) and on excretory phase (9.7 mm, S.D. {+-} 3.4; 14.9 mm, S.D. {+-} 4.5), respectively, for Groups I and II. Intrarenal collecting system wall was clearly identified on both corticomedullary and nephrographic phases in 91% of Group II against 20% of Group I. Opacification of the entire ureter was excellent on excretory phase in 96% of Group II against 13% of Group I. The difference between the mean values for the two groups was statistically significant for all phases (p < 10{sup -9}). Conclusion: Intermediate-dose furosemide (20 mg) before MDCTU is a very simple add-on for accurate depiction of pelvicalyceal details and collecting system wall without artefacts. The procedure is associated with a constant and complete visualisation of the entire urete.

  16. Diagnostic Sensitivity of Multidetector-Row Spiral Computed Tomography Angiography in the Evaluation of Type-II Endoleaks and their Source: Comparison between Axial Scans and Reformatting Techniques

    Energy Technology Data Exchange (ETDEWEB)

    Saba, L.; Pascalis, L.; Montisci, R.; Sanfilippo, R.; Mallarini, G. (Depts. of Radiology and Vascular Surgery, Azienda Ospedaliero-Universitaria di Cagliari, Polo di Monserrato, Monserrato, Cagliari (Italy))

    2008-07-15

    Background: After endovascular stent-graft placement, several complications may occur. Retrograde filling of the aneurysm (type-II endoleak) is the most common. Purpose: To evaluate the accuracy, image quality, and interobserver agreement of multidetector-row spiral computed tomography angiography (MDCTA) in the diagnosis of type-II endoleak, by using various types of reformatting techniques in comparison to regular axial images. Material and Methods: Twenty-four patients who had had endovascular repair of an infrarenal abdominal aortic aneurysm with stent graft were retrospectively studied. In 12 of 24 patients, a type-II endoleak was found. CT scans were obtained after intravenous administration of 130 ml of nonionic contrast material using a 4-6-ml/s flow rate. All patients were investigated with axial scans, multiplanar reconstruction (MPR), maximum intensity projection (MIP), shaded-surface display (SSD), and volume-rendering (VR) techniques. For each patient and for each reconstruction method, the image quality of the scans was scored as 0 for bad quality, 1 for poor quality, 2 for good quality, and 3 for excellent quality images. Two radiologists reviewed the CT images independently. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were calculated for each reconstruction method, with the axial images as the reference method. Interobserver agreement and kappa value were also recorded. Results: MPR showed the highest sensitivity (83% and 67% for observers 1 and 2, respectively), PPV (91% and 80% for observers 1 and 2, respectively), and NPV (85% and 71% for observers 1 and 2, respectively), whereas VR showed the highest specificity (92% for both observer 1 and 2). Conclusion: Reformatting techniques provide good-quality images; nevertheless, their efficacy in the study of type-II endoleak was found to be suboptimal in comparison to regular axial images. The MPR technique is probably the best choice in conjunction

  17. Discussion on Low Tension of Air of 16 Slice Spiral CT Three Phases Enhanced Images on the Application of Preoperative TNM Staging of Gastric Cancer%探讨低张充气16层螺旋CT三期增强扫描对胃癌术前TNM分期的应用

    Institute of Scientific and Technical Information of China (English)

    纪忠杰

    2014-01-01

    目的:探讨低张充气16层螺旋CT三期增强扫描对胃癌术前TNM分期的应用。方法选取我院82例胃癌患者,对其术前TNM分期进行低张充气16层螺旋CT三期增强扫描,并结合原始图像,分析其应用效果。结果82例患者在T分期的扫描准确率是63.42%,N分期扫描结果准确率是52.44%,M分期准确率是81.71%。结论低张充气16层螺旋CT三期增强扫描在患者术前TNM分期的诊断准确率较高,对临床确定手术方案具有重要指导意义。%Objective To investigate the 16 slice spiral CT hypotonic aeration three phase enhanced scan on the application of preoperative TNM staging of gastric cancer. Methods In our hospital in 82 cases of gastric cancer,the preoperative TNM staging of low tension of air 16 slice helical CT three phases enhanced images,and the combination of the original image,the analysis of its application effect. Results 82 patients in T stage scanning accuracy rate is 63.42%,the N staging scan results accuracy rate is 52.44%,the M staging accuracy rate is 81.71%. Conclusion 16 slice spiral CT hypotonic aeration three phase enhanced scanning in patients with preoperative TNM staging diagnosis accurate rate is higher, has the important guiding sense to the clinical determination of operation scheme.

  18. 16层螺旋CT与99Tcm-MDP全身骨显像对腰椎骨转移瘤的诊断价值%Exploration on the diagnostic value of 16-slice spiral CT and whole body bone scintigraphy in lumbarspinebonemetastases

    Institute of Scientific and Technical Information of China (English)

    商增全

    2013-01-01

    Objective:To explore the diagnostic value of 16-slice spiral CT and 99Tcm-MDP whole body bone scintigraphy in lumbar spine bone metastases. Methods:The retrospective analysis of 47 cases of hospitalized patients with the clinical diagnosis of lumbar bone metastases and complete information 63 lumbar bone metastases, and analyze the results of 16-slice spiral CT with 99Tcm-MDP whole body bone scintigraphy. Results:We calculated the sensitivity and specificity of the two inspection results. 16-slice spiral CT findings of 43 patients with a total of 59 vertebrae were damaged, sensitivity (84.6%), 16-slice spiral CT clear diagnosis of lumbar metastases in 37 cases, suspicious 13 cases;99Tcm-MDP whole body bone scintigraphy found 37 patientsa total of 41 the abnormal vertebral radioactive concentrated, sensitivity, whole body bone scintigraphy clear diagnosis of lumbar spine metastases in 27 cases, suspicious of nine cases;39 patients with systemic bone scintigraphy found multiple extrapyramidal radioactive anomalies concentrated. Conclusion:16-slice spiral CT diagnosis of lumbar bone metastases compared with 99Tcm-MDP bone scintigraphy has a higher sensitivity, but the majority of patients with a more definitive diagnosis can be obtained by 99Tcm-MDP bone scintigraphy.%目的:探讨16层螺旋CT与99Tcm-亚甲基二膦酸盐(99Tcm-MDP)全身骨显像对腰椎骨转移瘤的诊断价值。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患者47例63处腰椎骨转移瘤,分析其16层螺旋CT与99Tcm-MDP全身骨显像检查结果。计算两种检查结果的灵敏度及特异度。结果:16层螺旋CT发现43例患者共59处椎体破坏,其灵敏度为84.6%;明确诊断腰椎转移瘤37例,可疑13例;99Tcm-MDP全身骨显像检查发现37例患者共41处椎体放射性异常浓聚,其灵敏度为65.2%,全身骨显像明确诊断腰椎转移瘤27例,可疑9例;39例患者全身骨显像发现椎体外多发放

  19. Research Status Quo of Perfusion Imaging with Multidetector Row Computed Tomography on Esophageal Cancer%食管癌多层螺旋CT灌注成像研究现状

    Institute of Scientific and Technical Information of China (English)

    陈天武; 董志辉

    2011-01-01

    食管癌是常见的恶性肿瘤之一.多层螺旋CT 灌注成像作为一种无创手段,可以在活体状态下评价其微循环.近年来,CT 灌注成像在食管癌的微循环评价、放化疗的疗效判断方面取得进展.本文着重综述多层螺旋CT灌注成像技术在食管癌中的应用研究现状.%Esophageal cancer is one of frequent malignant tumors worldwide. As a noninvasive technique. computed tomography (CT) perfusion imaging could be valuable to assess the microcirculation of esophageal cancer in uivo.Recently, multidetector row CT ( MDCT) perfusion imaging has sparked new interest in the assessment of the microcirculation of esophageal cancer, and therapeutic effects of chemoradiotherapy on this tumor. In this paper, we reviewed the status quo of perfusion imaging with MDCT on esophageal cancer.

  20. Comparison between Carotid Artery Wall Thickness Measured by Multidetector Row Computed Tomography Angiography and Intimae-Media Thickness Measured by Sonography

    OpenAIRE

    Živorad N. Savić; Ivan I. Soldatović; Milan D. Brajović; Aleksandra M. Pavlović; Dušan R. Mladenović; Vesna D. Škodrić-Trifunović

    2011-01-01

    The increased thickness of the carotid wall >1 mm is a significant predictor of coronary and cerebrovascular diseases. The purpose of our study was to assess the agreement between multidetector row computed tomography angiography (MDCTA) in measuring carotid artery wall thickness (CAWT) and color Doppler ultrasound (CD-US) in measuring intimae-media thickness (IMT). Eighty-nine patients (aged 35–81) were prospectively analyzed using a 64-detector MDCTA and a CD-US scanner. Continuous data wer...

  1. 非同步16排CT联合 B超定位微创经皮肾穿刺取石术治疗上尿路结石%The Treatment of Upper Urinary Calculus with Minimally Invasive Percutaneous Nephrolithotomy Under the Guidance of Asynchronous 16-slice Spiral CT Combined B-ultrasound Localization

    Institute of Scientific and Technical Information of China (English)

    黄敏志; 黄裕清; 余自强; 邹火生; 李健; 钟凯华

    2011-01-01

    目的:探讨非同步16排CT联合B超定位穿刺的方法建立经皮肾通道,行微创经皮肾输尿管镜取石术治疗上尿路结石的可行性及疗效.方法:回顾性分析150例单侧肾或(及)输尿管上段结石患者,采用非同步16排螺旋CT辅助联合术中B超定位穿刺行MPCNL.结果:150例均一期成功建立经皮肾通道,一期碎石,一期结石清除率98%(147/150),3例需二期PCNL术取净,手术平均时间为88min,术中平均出血量50mL,未出现中转开放手术情况,无大出血及输血,无输尿管损伤穿孔,无气胸及胸腹腔积液,腹腔脏器损伤等严重并发症.结论:非同步16排CT联合B超定位穿刺MPCNL治疗上尿路结石临床疗效确切安全,具有临床推广应用价值.%Objective: To evaluate the feasibility and the clinical outcomes of minimally invasive percutaneous nephrolithotomy( MPCNL ) with asynchronous 16-slice spiral CT combined B-ultrasound localization to establish percutaneous access in the treatment of upper urinary calculus. Method: 150 cases of unilateral kidney or land) ureteral stones underwere MPCNL under the guidance of asynchronous 16-slice spiral CT combined B-ultrasound localization were retrospectively analyzed. Result: 150 cases established percutaneous access successfully in first operation, and the overrall rate of fragmentation for upper urinary calculus was 98%. The stage 2 lithotripsy was carried in 3 cases. The mean operative time was 88min;mean blood loss was 50mL;Conversion to open surgery does not appear;No perioperative severe complications such as hemorrhoea and blood transfusion, ureteral perforation, pneumatothorax and Pleural effusion,ascites, trauma of abdominal organ occurred. Conclusion: MPCNL with asynchronous 16-slice spiral CT combined B-ultrasound localization is a feasible, safe and highly effective therapy for the treatment of upper urinary calculus. It has high clinical Application value.

  2. 16层螺旋CT三维重建技术在泌尿系梗阻诊断中的应用价值%Application Value of 16 Slice Spiral CT 3D Reconstruction in Diagnosis of Urinary Tract Obstruction

    Institute of Scientific and Technical Information of China (English)

    赵林

    2015-01-01

    Objective To explore the application value of 16 slice spiral CT 3D reconstruction in the enhancement of urinary system obstruction. Methods 37 cases of urinary tract obstruction, 16 slice spiral CT plain scan, enhanced and delayed scan urography scanning, the processing technology of delay scan data for 3D reconstruction can be obtained, including renal calyx and pelvis ureter and bladder intact urinary tract 3D imaging. Results The 16 slice spiral CT delay time of urinary tract imaging can clearly display the anatomic structure and the relationship between the pathological changes and the urinary tract. 37 cases of 2 patients, 30 cases of urinary calculi, 3 cases of duplication of renal pelvis and ureter, 2 cases of giant ureter, 2 cases of renal pelvis and ureter stenosis, CT results were consistent with the clinical diagnosis. Conclusion 16 slice spiral CT plain scan, enhanced and delayed scan urography scanning for display parts of the urinary system diseases, etiology and urinary tract obstruction degree of ef icient, safe and reliable characteristics, as the diagnosis of urinary tract obstruction diseases a noninvasive imaging methodology is worthy to?be popularized.%目的探讨16层螺旋CT三维重建技术在泌尿系梗阻增强扫描时的应用价值。方法37例泌尿系梗阻病变行16层螺旋CT平扫,增强扫描及延时尿路造影扫描,利用后处理技术对延时扫描资料进行三维重建处理,可以得到包括肾盏肾盂输尿管及膀胱完整的尿路三维成像。结果16层螺旋CT延时尿路造影可清楚的显示泌尿系解剖结构及病变原因和尿路间的位置关系。37例患者中,泌尿系结石30例,肾盂输尿管重复畸形3例,巨输尿管症2例,肾盂输尿管联合部狭窄2例,CT结果与临床诊断符合。结论16层螺旋CT平扫,增强扫描及延时尿路造影扫描对于显示泌尿系疾病部位,病因和尿路梗阻程度有高效,安全可靠地特点,作为泌尿

  3. Discordant findings of dimercaptosuccinic acid scintigraphy in children with multi-detector row computed tomography-proven acute pyelonephritis

    Directory of Open Access Journals (Sweden)

    Jeongmin Lee

    2011-05-01

    Full Text Available Purpose : The diagnosis of acute pyelonephritis (APN is often difficult, as its clinical and biological manifestations are non-specific in children. If not treated quickly and adequately, however, APN may cause irreversible renal damage, possibly leading to hypertension and chronic renal failure. We were suspecting the diagnostic value of 99mTc-dimercaptosuccinic acid (DMSA scan by experiences and so compared the results of DMSA scan to those of multi-detector row computed tomography (MDCT. Methods : We retrospectively selected and analyzed 81 patients who were diagnosed as APN by MDCT during evaluation of their acute abdomen in emergency room and then received DMSA scan also for the diagnostic work-up of APN after admission. We evaluated the results of imaging studies and compared the diagnostic value of each method by age groups, &lt;2 years (n=45 and ?#242; years (n=36. Results : Among total 81 patients with MDCT-proven APN, DMSA scan was diagnostic only in 55 children (68%, while the remaining 26 children (32% showed false negative normal findings. These 26 patients were predominantly male and most of them, 19 (73.1% were &lt;2 years of age. Conclusion : DMSA scan holds obvious limitation compared to MDCT in depicting acute inflammatory lesions of kidney in children with APN, especially in early childhood less than 2 years of age. MDCT showed hidden lesions of APN, those were undetectable through DMSA scan in children.

  4. Renal replacement lipomatosis: multidetector-row computed tomography findings in one case

    Energy Technology Data Exchange (ETDEWEB)

    Calisir, C.; Can, C.; Kebapci, M. [Dept. of Radiology and Dept. of Urology, Medical Faculty, Eskisehir Osmangazi Univ, Eskisehir (Turkey)

    2007-02-15

    Replacement lipomatosis of the kidney is the result of severe atrophy of the renal parenchyma often caused by chronic calculus disease with secondary marked benign proliferation of fibrofatty tissue replacing atrophied renal parenchyma. Different radiological modalities have been used to illustrate this entity, with magnetic resonance imaging, ultrasound, intravenous pyelogram, and computed tomography (CT) used most frequently. We report multidedector CT (MDCT) findings of replacement lipomatosis in a 50-year-old woman. We think that it accurately provides a complete one-step diagnostic workup and appropriate pre-surgical planning for patients for whom there is a suspicion of replacement lipomatosis.

  5. Application value of coronary artery calcification score with 16 slice spiral CT in the diagnosis of coronary heart disease%16层螺旋 CT 冠状动脉钙化积分在冠心病诊断中的应用价值研究

    Institute of Scientific and Technical Information of China (English)

    杨德胜

    2016-01-01

    Objective To investigate the value of coronary artery calcification score with16 slice spiral CT in the diagnosis of coronary heart disease .Methods A total of 35 cases patients with coronary heart disease admitted to our hospital from August 2013 to August 2015 were selected as the observation group ,and 35 patients with non-coronary heart disease were selected as con-trol group .Two groups of patients were performed of coronary artery calcification score with 16 slice spiral CT ,and coronary artery calcification score and total score of the two groups were compared .Results The scores of right coronary artery ,left anterior de-scending branch ,left anterior descending artery ,left anterior descending artery ,left main stem and total calcification score in the ob-servation group were significantly higher than those in the control group (P< 0 .05) .Condition of vascular calcification was as fol-lowing :the rate of patients with severe calcification was the highest in the observation group (88 .57% ) ,and the rate of patients without calcification in control group was the highest (77 .14% ) .Meanwhile ,the rates of patients without calcification and patients with a little calcification of the observation group were significantly lower than that of the control group (P< 0 .05) .The rate of pa-tients with severe calcification in the observation group was significantly higher than that in the control group (P< 0 .05) .Conclu-sion Coronary artery calcification score with 16 slice spiral CT can help to clarify the degree of calcification in patients with coro-nary heart disease ,which has higher clinical value and could be used for screening and diagnosis of coronary heart disease .%目的:探讨16层螺旋 CT 冠状动脉钙化积分对于冠心病诊断的应用价值。方法选择2013年8月至2015年8月在该院收治的35例冠心病患者作为观察组,另选择同期收治的35例非冠心病患者作为对照组。两组患者均行16层螺旋 CT 冠状

  6. Advanced Gastric Cancer and Perfusion Imaging Using a Multidetector Row Computed Tomography: Correlation with Prognostic Determinants

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Huan; Pan, Zilai; Du, Lianjun; Yan, Chao; Ding, Bei; Song, Qi; Ling, Huawei; Chen, Kemin [Jiaotong University, Jiaotong (China)

    2008-04-15

    Objective : To investigate the relationship between the perfusion CT features and the clinicopathologically determined prognostic factors in advanced gastric cancer cases. Materials and Methods : A perfusion CT was performed on 31 patients with gastric cancer one week before surgery using a 16-channel multi-detector CT (MDCT) instrument. The data were analyzed with commercially available software to calculate tumor blood flow (BF), blood volume (BV), mean transit time (MTT), and permeability surface (PS). The microvessel density (MVD), was evaluated by immunohistochemical staining of the surgical specimens with anti-CD34. All of the findings were analyzed prospectively and correlated with the clinicopathological findings, which included histological grading, presence of lymph node metastasis, serosal involvement, distant metastasis, tumor, node, metastasis (TNM) staging, and MVD. The statistical analyses used included the Student's t-test and the Spearman rank correlation were performed in SPSS 11.5. Result : The mean perfusion values and MVD for tumors were as follows: BF (48.14+/-16.46 ml/100 g/min), BV (6.70+/-2.95 ml/100 g), MTT (11.75+/-4.02 s), PS (14.17+/-5.23 ml/100 g/min) and MVD (41.7+/-11.53). Moreover, a significant difference in the PS values was found between patients with or without lymphatic involvement (p = 0.038), as well as with different histological grades (p 0.04) and TNM stagings (p = 0.026). However, BF, BV, MTT, and MVD of gastric cancer revealed no significant relationship with the clinicopathological findings described above (p > 0.05). Conclusion : The perfusion CT values of the permeable surface could serve as a useful prognostic indicator in patients with advanced gastric cancer.

  7. Study of radiation dose to the eye lens by multi-detector row computed tomography of the temporal bone

    International Nuclear Information System (INIS)

    The exposure of the eye lens caused by multi-detector row computed tomography (MDCT) of the temporal bone is a serious problem. Our aim was to evaluate the radiation dose to the eye lens by different scan baselines (orbitomeatal line; OML, acanthiomeatal line; AML) and examine the difference of the depiction of the temporal bone structures. Measurement of the exposure to the eye lens was performed by means of MDCT of the temporal bone with a radio-photoluminescence glass dosimeter using a rand phantom. Moreover, we studied only one volunteer (58-year-old male) who had no symptom and was not suspected of having any ear abnormalities with a two scan baseline. Visualization of the major anatomical structures of the temporal bone (the tympanic portion of the facial nerve canal, the body of the incus, stapes superstructures, vestibule etc.) was performed on the volunteer. The average absorbed dose was 6.42 mGy by the OML and 1.59 mGy by the AML, respectively. With regard to visualization of the temporal bone structures, all structures were of equal quality with the two scan baseline. With the AML line, the radiation dose to the eye lens was reduced to 75%. Therefore, the authors recommended an AML for use for MDCT of the temporal bone. In clinical practice, the optimization of scanning factor (kVp, mAs etc.) and the use of the radio-protection should be implemented for radiation dose reduction of the eye lens by MDCT of the temporal bone. (author)

  8. Multidetector-row computed tomography for evaluating the branching angle of the celiac artery: a descriptive study

    International Nuclear Information System (INIS)

    We performed this study in order to investigate the shape of the origin of the celiac artery in maximum intensity projection (MIP) using routine 64 multidetector-row computed tomography (MDCT) data in order to plan for the implantation of an intra-arterial hepatic port system. A total of 1,104 patients with hepatocellular carcinoma were assessed with MDCT. In the definition of the branching angle, the anterior side of the abdominal aorta was considered the baseline, and the cranial and caudal sides were designated as 0 and 180 degrees, respectively. The angles between 0 and 90 degrees and between 90 and 180 degrees from the cranial side were considered upward and downward, respectively, and the branching angle of the celiac artery was classified every 30 degrees. The subclavian arterial route was used for the implantation of an intra-arterial hepatic port system in patients with branching angles of 150 degrees or more (sharp downward). The median branching angle was (median ± standard deviation) 135 ± 23 (range, 51–174) degrees. The branching was upward in 77 patients (7%) and downward in 1,027 patients (93%). The branching was downward with an angle of 120 to150 degrees in most patients (n = 613). The branching was sharply downward with an angle of 150 degrees or more in 177 patients (16%). A total of 10 patients were referred for interventional placement of an intra-arterial hepatic port system. The subclavian arterial route was used for implantation of an intra-arterial hepatic port system in 2 patients with sharp downward branching. The branching angle of the celiac artery can be easily determined by the preparation of MIP images from routine MDCT data. MIP may provide useful information for the selection of the catheter insertion route in order to avoid a sharp branching angle of the celiac artery

  9. Assessment of aec system response in ge 16 slices scanner

    International Nuclear Information System (INIS)

    Computed Tomography scanners equipped with system for Automatic Exposure Control ( AEC ) have been recently installed into clinical practice in Macedonia. Assessment of their AEC settings and performances is important task from patient doses and images quality point of view . This study was done by analyzing of CT examinations in patients in the City Hospital ' 8 September' in Skopje. The examinations were carried out by GE Bright Speed 16 slices scanner equipped with AEC system . In all patients were applied the same protocol with constant acquisition parameters was applied , and images were reconstructed by standard mode . Patient dimensions and image noise were measured from the scouts and axial images. From DICOM header the information related to dose, TCM and slice position were extracted . It was found that scanner automatic exposure system adjusts exposure mainly according to maximal patient lateral dimension (LR) and applying the same Noise Index (NI) value in patients with different size does not provides necessarily the same image noise level. In patients which LR dimension was less than 30 cm it was found that AEC adjusts tube current at the minimum of m A interval with no modulation throughout different body parts. (Author)

  10. Multidetector-row helical computed tomography in the evaluation of cervical spine disorders; Tomografia computadorizada multislice no diagnostico das afeccoes da coluna cervical

    Energy Technology Data Exchange (ETDEWEB)

    Rosemberg, Laercio Alberto; Almeida, Milena Oliveira; Rios, Adriana Martins; Garbaccio, Viviane Ladeira; Kim, Nelson Ji Tae; Daniel, Mauro Miguel; Funari, Marcelo Buarque de Gusmao [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil). Dept. de Imagem]. E-mail: laercio@einstein.br

    2003-07-01

    Multidetector-row computed tomography (MRCT) has advantages in comparison to conventional helical computed tomography, such as reduction of study time, lower radiation doses, fewer metallic artifacts and high quality multiplanar reformatting and three dimensional reconstructions. We reviewed 150 cervical spine examinations and selected the most illustrative cases including congenital anomalies, degenerative lesions, spinal infections, neoplasms, traumatic injuries and postoperative abnormalities. The quality of multiplanar reformatting and volume reconstructions of the MRCT made the detection and evaluation of most of cases with complex anatomy easier and more precise. (author)

  11. Low-dose 16-slice spiral CT thoracic angiography using Z-axis modulation%16层CT胸部血管成像Z轴调制低剂量研究

    Institute of Scientific and Technical Information of China (English)

    李惠民; 于红; 肖湘生; 虞崚崴

    2011-01-01

    Objective To explore the feasibility of low dose in MSCT thoracic angiography using Z-axis modulation. Methods The consecutive 60 patients were averagely divided into 3 groups and underwent thoracic angiography with a Toshiba Aquilion 16 scanner. The whole chest acquisition was commenced in automatic exposure control with Z-axis modulation 20-25 seconds after the contrast material was administered at the rate of 3.5-4. 0 ml/s. With the noise index (SD) as the variable, three study groups were classified as A (SD = 12) , B (SD = 15 ), and C (SD = 18 ). The mAs value per slice and the number of slices were recorded. The noises and artifacts of the axial images and the acceptability of CT angiogram were evaluated. The difference among the groups was compared by using ANOVA or nonparametric Kruskal-Wallis test. The threshold of the P value was 0. 05. Results The mean mAs value (46. 4 ± 15.6) mAs in group A was the highest but the SD value (21.6 ±7.7) was the lowest. The mean mAs value ( 37. 0 ± 13.5 ) and the SD value ( 24. 0 t 5.4 ) in group B were the mediate. The mean mAs value ( 20. 7 ±6.3) mAs in group C was the lowe(s)t but the SD value ( 30. 7 ± 6.9) was the highest ( H = 31. 390, P =0. 000). The middle slice images in all patients had the smallest mAs (40. 9,31.3,17. 1 for group A,B,C,respectively; F =9. 578, H =22. 230, F =21. 180,P =0. 000) and SD values( 16. 3, 20. 0,25.4 for group A,B,C, respectively; H = 28. 982, H = 20. 824, H = 24. 396, P = 0. 000). The acceptability of CT angiogram in all patients was excellent. The CT value of descending aorta in group A, B, and C was ( 335 ± 85 ) HU,(334 ±56)HU, and (427 ± 63 )HU, respectively. Conclusion Low dose in MSCT thoracic angiography using Z-axis modulation is feasible. We can use low dose (20 mAs, etc. ) for CT angiography when the contrast is significant.%目的 探讨16层CT胸部增强血管成像中Z轴调制合理低剂量的可行性.方法 连续60例患者依序分为3组,每组20例,采用16

  12. 16层螺旋CT平扫和增强扫描对急性脑出血临床结局预测价值的比较%Comparision of predictive value of 16 slice spiral CT plain scan and en-hanced scan for clinical outcome of acute cerebral hemorrhage

    Institute of Scientific and Technical Information of China (English)

    陈弼政; 吴欣洪

    2015-01-01

    Objective To compare predictive value of 16 slice spiral CT plain scan and enhanced scan for clinical out-come of acute cerebral hemorrhage. Methods 200 patients with acute cerebral hemorrhage treated in our hospital from January 2010 to January 2014 were selected as research objects,and they were divided into the two groups,and there were 100 cases in each group.Observation group was conducted with CT enhanced scan,while control group was given CT plain scan.Imaging characteristics of two groups was observed,and diagnosed value between two groups was com-pared. Results The sensitivity of was 47.62%,the specificity was 84.81%,the negative predictive value was 85.90%,the positive predictive value was 45.45% in control group while the sensitivity was 66.67%,the specificity was 92.41%,the negative predictive value was 91.25%,the positive predictive value was 70.0% in observation group,and sensitivity and specificity in observation group was obviously higher than that of control group,and there was a statistical difference (P<0.05). Conclusion Predictive value of clinical outcome of acute cerebral hemorrhage of 16 slice spiral CT enhanced scan is higher than that of CT plain scan.%目的:比较16层螺旋CT平扫和增强扫描对急性脑出血临床结局的预测价值。方法选取本院2010年1月~2014年1月收治的急性脑出血患者200例为研究对象,根据影像学诊断方法不同分为两组,每组100例。观察组进行CT增强扫描,对照组行常规CT平扫,观察两组的影像学特征,比较两组的诊断价值。结果对照组预测脑出血增长的灵敏度为47.62%,特异度为84.81%,阴性预测值为85.90%,阳性预测值为45.45%,观察组的灵敏度为66.67%,特异度为92.41%,阴性预测值为91.25%,阳性预测值为70.0%,观察组的灵敏度、特异度均明显高于对照组,差异有统计学意义(P<0.05)。结论16层螺旋CT增强扫描对急性脑出血临床结局的预测价值高于常规平扫。

  13. Application of Low-dose Chest 16-slice Spiral CT Scan in Examination of Foreign Bodies in Bronchi of Children%16层螺旋CT低剂量胸部扫描在小儿气道异物检查中的应用

    Institute of Scientific and Technical Information of China (English)

    曹治婷

    2011-01-01

    目的:探讨16层螺旋CT低剂量胸部扫描在小儿气道异物检查中的应用价值.方法:对48例经纤维支气管镜证实有气道异物的患儿行不同荆量检查,其中28倒为低剂量(30 mAs)扫描,20例为常规(100 mAs)剂量扫描,将轴位薄层原始数据传至工作站分别行多平面重组(MPR)、最小密度投影(MinIP)、容积再现(VR)及CT仿真内镜(CTVE)后处理重建成像、分析其敏感性和准确性.结果:28例低剂量扫描患儿中发现异物27例,诊断准确率为96.4%;20例常规刺量扫描患儿中发现异物20例,诊断准确率为100%.两者无显著性差异(P>0.05).结论:16层螺旋CT低剂量胸部扫描不仅减少小儿接受的辐射剂量,后处理图像重建后可清楚显示异物的部位、形态、大小及阻塞部位,是诊断小儿气道异物无创并实用的检查方法.%Objective To discuss the value of low-dose chest 16-slice spiral CT scan in the examination of foreign hodies in bronchi of children. Methods Forty-eight children with foreign bodies aspiration were scanned transversely and reconstructed in different doses of the line check, twenty-eight were scanned witb low-dose, the others were scanned with conventional dose. Then the original axial data were transferred to workstation for image reconsruction by multi-planar reconstruction (MPR), minimum intensity projection (MinIP), volume rendering (VR) and CT virtual endoscopy (CTVE) respectively. The sensitivity and accuracy were analyzed. Results Twenty-seven cases were diagnosed with foreign bodies in those scanned with low-dose, diagnostic accuracy was 96.4%. Twenty cases were diagnosed with foreign bodies diagnostic accuracy was 100%. The difference was not statistically significant (P>0.05). Conclusion Low-dose chest 16-slice spiral CT scan can not only reduce the radiation dose received but also clearly show the site, the shape and the size of foreign body, and even the position of obstruction after post

  14. Visualization of congenital thoracic vascular anomalies using multi-detector row computed tomography and two- and three-dimensional post-processing

    Energy Technology Data Exchange (ETDEWEB)

    Schertler, Thomas [Department of Medical Radiology, Institute of Diagnostic Radiology, University Hospital Zurich (Switzerland); Wildermuth, Simon [Institute of Diagnostic Radiology, Kantonsspital St.Gallen (Switzerland)]. E-mail: Simon.Wildermuth@kssg.ch; Teodorovic, Ninoslav [Department of Medical Radiology, Institute of Diagnostic Radiology, University Hospital Zurich (Switzerland); Mayer, Dieter [Division of Cardiovascular Surgery, University Hospital Zurich (Switzerland); Marincek, Borut [Department of Medical Radiology, Institute of Diagnostic Radiology, University Hospital Zurich (Switzerland); Boehm, Thomas [Department of Medical Radiology, Institute of Diagnostic Radiology, University Hospital Zurich (Switzerland); Department of Medical Radiology, Institute of Diagnostic Radiology, Kantonsspital Chur (Switzerland)

    2007-01-15

    Anomalies of the vascular system are caused by false embryogenesis and are therefore present from birth. Single-detector row spiral computed tomography angiography (CTA) and multi-detector row computed tomography angiography (MDCTA) have gained increasing importance in the non-invasive assessment of vascular pathologies and replace conventional angiography in many cases. High-resolution volumetric datasets that are acquired during a single breath-hold give the possibility of two- (2D) and three-dimensional (3D)-post-processing. Due to post-processing, even complex vascular malformations are visualized in an understandable way. Furthermore, CTA, in contrast to conventional angiography, depicts not only the vascular structures but also allows assessment of the surrounding anatomical structures. We present cases of rare congenital anomalies of the thoracic vessels using MDCT with special respect to 2D- and 3D-post-processing.

  15. Imaging aid for thoracic surgery. Multidetector-row computed tomography evaluation of the tracheobronchial structure and bronchial tube selection for one-lung anesthesia

    International Nuclear Information System (INIS)

    The tracheobronchial structures were evaluated by multidetector-row computed tomography (MDCT), which provided imaging information for one-lung anesthesia during thoracic surgery. The subjects consisted of 100 patients. Three-dimensional (3D) images of the tracheobronchial structures and the bronchial tubes were created. Individual differences were found in the tracheobronchial structures in 100 patients. The length and the diameter of the right main bronchus were measured with 3D images and were not related to the patient's physical appearance, such as body height. Problematic intubation cases included a short right main bronchus <10 mm, an anomaly of the right bronchus, and tracheal stenosis. The 3D images demonstrated problematic areas of the tracheobronchial structure and helped the anesthesiologists select the most appropriate bronchial tube suitable for the tracheobronchial structure variations. Therefore, this technique is considered to contribute to safer performance of one-lung anesthesia. (author)

  16. NON-INVASIVE IMAGING OF CORONARY ARTERY WITH 16-SLICE SPIRAL COMPUTED TOMOGRAPHY

    Institute of Scientific and Technical Information of China (English)

    Zhu-hua Zhang; Wen-bin Mou; Li-Ren Zhang; Wen-ling Zhu; Chao Ni; Hua Ren; Hong-quan Yu; Qi Miao; Qi Fang; Zheng-yu Jin; Dong-jing Li; Song-bai Lin; Shu-yang Zhang; Ling-yan Kong; Yun Wang; Lin-hui Wang; Wen-min Zhao

    2004-01-01

    Objective To evaluate the value of 16-slice spiral CT in the demonstration of coronary artery and in the diagnose of coronary artery stenosis.Methods Plain and enhanced CT scans were performed with a 16-slice CT scanner (Sensation 16, Siemens, Germany)in 230 patients with suspected coronary heart disease (CHD). Parameters of the plain scan were: 120 kV, 133 mA, slice collimation 16 mm×1.5 mm, rotation time 0.42 seconds, increment 1.5 mm, and slice width 3 mm. Parameters of the enhanced scan were: 120 kV, 500 mA, slice collimation 16 mm×0.75 mm, rotation time 0.42 seconds, increment 0.5 mm, and slice width 1 mm. Enhanced CT scan was performed with a rapid intravenous injection of 100 mL iothalamate meglumine (Ultravist)(370 mgI/mL) or Omnipaque (350mgI/mL) and 30 mL 0.9% NaC1 chaser bolus at a flow rate of 3.5 mL/s. Calcium scoring with plain scan images and two and three dimensional reconstruction with enhanced scan images were made in all cases,among which 30 cases underwent conventional coronary angiography. Demonstration of coronary arteries and their stenosis were evaluated and the factors that might influence the image quality were analyzed.Results Coronary calcium scores were calculated and coronary artery was demonstrated in our study. In the evaluation of image quality with volume rendering technique (VRT) images, 78.3% of the images were of the first class, 12.2% the second class, and 9.6% the third class. Multi-planar reconstruction (MPR) and maximal intensity projection (MIP) were better than VRT in the demonstration of small branches. The image quality was related to the heart rate, with or without arrhythmia,and breath-hold ability of patients. Comparative study of the stenosis of coronary arteries in 30 cases showed that the sensitivity and specificity of 16-slice coronary CT angiography (CTA) to diagnose significant stenosis were 95.8% and 94.8% respectively.Conclusion As a non-invasive and quick method, 16-slice coronary CTA is sensitive and

  17. Accessible or Inaccessible? Diagnostic Efficacy of CT-Guided Core Biopsies of Head and Neck Masses

    Energy Technology Data Exchange (ETDEWEB)

    Cunningham, Jane D., E-mail: janecunningham0708@gmail.com; McCusker, Mark W.; Power, Sarah; PearlyTi, Joanna; Thornton, John; Brennan, Paul; Lee, Michael J.; O’Hare, Alan; Looby, Seamus [Beaumont Hospital, Department of Radiology (Ireland)

    2015-04-15

    PurposeTissue sampling of lesions in the head and neck is challenging due to complex regional anatomy and sometimes necessitates open surgical biopsy. However, many patients are poor surgical candidates due to comorbidity. Thus, we evaluated the use of CT guidance for establishing histopathological diagnosis of head and neck masses.MethodsAll consecutive patients (n = 22) who underwent CT-guided core biopsy of head or neck masses between April 2009 and August 2012 were retrospectively reviewed using the departmental CT interventional procedures database. The indication for each biopsy performed was to establish or exclude a diagnosis of neoplasia in patients with suspicious head or neck lesions found on clinical examination or imaging studies. Patients received conscious sedation and 18 G, semiautomated core needle biopsies were performed by experienced neuroradiologists using 16-slice multidetector row CT imaging guidance (Somatom Definition Siemens Medical Solutions, Germany). Histopathology results of each biopsy were analysed.ResultsSixteen of 22 biopsies that were performed (73 %) yielded a pathological diagnosis. Anatomic locations biopsied included: masticator (n = 7), parapharyngeal (n = 3), parotid (n = 3), carotid (n = 3), perivertebral (n = 3), pharyngeal (n = 2), and retropharyngeal (n = 1) spaces. Six biopsies (27 %) were nondiagnostic due to inadequate tissue sampling, particularly small biopsy sample size and failure to biopsy the true sampling site due to extensive necrosis. No major complications were encountered.ConclusionsThe use of CT guidance to perform core biopsies of head and neck masses is an effective means of establishing histopathological diagnosis and reduces the need for diagnostic open surgical biopsy and general anaesthesia.

  18. Multidetector-row computed tomography for prosthetic heart valve dysfunction: is concomitant non-invasive coronary angiography possible before redo-surgery?

    Energy Technology Data Exchange (ETDEWEB)

    Tanis, Wilco [Haga Teaching Hospital, Department of Cardiology, The Hague (Netherlands); Haga Teaching Hospital, The Hague (Netherlands); Sucha, Dominika; Habets, Jesse [University Medical Center Utrecht, Department of Radiology, Utrecht (Netherlands); Laufer, Ward; Chamuleau, Steven [University Medical Center Utrecht, Department of Cardiology, Utrecht (Netherlands); Herwerden, Lex.A. van [University Medical Center Utrecht, Department of Cardiothoracic Surgery, Utrecht (Netherlands); Symersky, Petr [Vrije Universiteit, Department of Cardiothoracic Surgery, Amsterdam (Netherlands); Budde, Ricardo P.J. [Erasmus Medical Center, Department of Radiology, Rotterdam (Netherlands)

    2015-06-01

    Retrospective ECG-gated multidetector-row computed tomography (MDCT) is increasingly used for the assessment of prosthetic heart valve (PHV) dysfunction, but is also hampered by PHV-related artefacts/cardiac arrhythmias. Furthermore, it is performed without nitroglycerine or heart rate correction. The purpose was to determine whether MDCT performed before potential redo-PHV surgery is feasible for concomitant coronary artery stenosis assessment and can replace invasive coronary angiography (CAG). PHV patients with CAG and MDCT were identified. Based on medical history, two groups were created: (I) patients with no known coronary artery disease (CAD), (II) patients with known CAD. All images were scored for the presence of significant (>50 %) stenosis. CAG was the reference test. Fifty-one patients were included. In group I (n = 38), MDCT accurately ruled out significant stenosis in 19/38 (50 %) patients, but could not replace CAG in the remaining 19/38 (50 %) patients due to non-diagnostic image quality (n = 16) or significant stenosis (n = 3) detection. In group II (n = 13), MDCT correctly found no patients without significant stenosis, requiring CAG imaging in all. MDCT assessed patency in 16/19 (84 %) grafts and detected a hostile anatomy in two. MDCT performed for PHV dysfunction assessment can replace CAG (100 % accurate) in approximately half of patients without previously known CAD. (orig.)

  19. Sixteen multidetector row computed tomography of pulmonary veins: 3-months' follow-up after treatment of paroxysmal atrial fibrillation with cryothermal ablation

    International Nuclear Information System (INIS)

    The aim of the study was to assess pulmonary veins (PVs) for the presence of stenosis 3 months after cryothermal ablation (CA) with a new method of electrical isolation of PVs using contrast-enhanced 16 multidetector row computed tomography (MDCT). Twenty four patients with symptomatic atrial fibrillation underwent CA in 46 PVs. MDCT of PVs was performed before the treatment and after 3-months' follow-up. Following cryoablation, 13/24 (54%) patients showed clinical improvement and had reduced attacks of atrial fibrillation. The dimensions of the treated PVs remained unchanged: the coronal ostial diameter was 19.1±2.4 preprocedural versus 18.6±2.4 mm at follow-up, p>0.05; the ratio of the coronal and axial diameters at the ostium was 1.2±0.2 versus 1.2±0.1, p>0.05, respectively, and the coronal diameter of the proximal 10 mm was 17.1±2.5 mm versus 16.5±2.2 mm, p>0.05, respectively. CA is a promising technique for electrical isolation of PVs that has not been associated with stenosis at the orifice and the proximal 10 mm of the PVs after 3-months' follow-up. MDCT is a noninvasive, fast and comfortable method for assessment of PVs in a three-dimensional manner prior to ablative treatment and during the follow-up. (orig.)

  20. Sixteen multidetector row computed tomography of pulmonary veins: 3-months' follow-up after treatment of paroxysmal atrial fibrillation with cryothermal ablation

    Energy Technology Data Exchange (ETDEWEB)

    Maksimovic, Ruzica; Cademartiri, Filippo; Pattynama, Peter M.T. [Erasmus Medical Center, Department of Radiology, Rotterdam (Netherlands); Scholten, Marcoen F.; Jordaens, Luc J. [Erasmus Medical Center, Department of Cardiology, Rotterdam (Netherlands)

    2005-06-01

    The aim of the study was to assess pulmonary veins (PVs) for the presence of stenosis 3 months after cryothermal ablation (CA) with a new method of electrical isolation of PVs using contrast-enhanced 16 multidetector row computed tomography (MDCT). Twenty four patients with symptomatic atrial fibrillation underwent CA in 46 PVs. MDCT of PVs was performed before the treatment and after 3-months' follow-up. Following cryoablation, 13/24 (54%) patients showed clinical improvement and had reduced attacks of atrial fibrillation. The dimensions of the treated PVs remained unchanged: the coronal ostial diameter was 19.1{+-}2.4 preprocedural versus 18.6{+-}2.4 mm at follow-up, p>0.05; the ratio of the coronal and axial diameters at the ostium was 1.2{+-}0.2 versus 1.2{+-}0.1, p>0.05, respectively, and the coronal diameter of the proximal 10 mm was 17.1{+-}2.5 mm versus 16.5{+-}2.2 mm, p>0.05, respectively. CA is a promising technique for electrical isolation of PVs that has not been associated with stenosis at the orifice and the proximal 10 mm of the PVs after 3-months' follow-up. MDCT is a noninvasive, fast and comfortable method for assessment of PVs in a three-dimensional manner prior to ablative treatment and during the follow-up. (orig.)

  1. Evaluation of pulmonary artery branching patterns in the right upper lobe of the lung from multiplanar reconstruction images using multidetector-row computed tomography

    International Nuclear Information System (INIS)

    Multidetector-row computed tomography (MDCT) allows the high resolution multi-planar reconstruction (MPR) of images taken in the coronal, sagittal and axial planes. The purpose of this study was to evaluate the branching patterns of the A3a pulmonary artery in the right upper lobe from MPR images, and to assess the MDCT protocol and analysis method. The 32 cases studied comprised 30 patients with known or suspected disease of the lung parenchyma and 2 healthy volunteers. An MDCT scanner, Aquilion (Toshiba, Tokyo, Japan), was used for pulmonary imaging. Coronal and sagittal images were reconstructed from the axial scans at 2-mm intervals. The arterial variations of A3ai and A3aii, arising from either the superior trunk or the ascending artery (a branch of the inferior trunk) were evaluated. A3ai was found to originate from the superior trunk in 31 subjects (96.9%) and from the ascending artery in one subject (3.1%), whereas A3aii originated from the superior trunk in 12 subjects (62.5%) and from the ascending artery in 12 (37.5%). High resolution MPR images can provide a means of assessing the arterial branching pattern at the level of the sub-segmental pulmonary artery. (author)

  2. Multidetector-row computed tomography for prosthetic heart valve dysfunction: is concomitant non-invasive coronary angiography possible before redo-surgery?

    International Nuclear Information System (INIS)

    Retrospective ECG-gated multidetector-row computed tomography (MDCT) is increasingly used for the assessment of prosthetic heart valve (PHV) dysfunction, but is also hampered by PHV-related artefacts/cardiac arrhythmias. Furthermore, it is performed without nitroglycerine or heart rate correction. The purpose was to determine whether MDCT performed before potential redo-PHV surgery is feasible for concomitant coronary artery stenosis assessment and can replace invasive coronary angiography (CAG). PHV patients with CAG and MDCT were identified. Based on medical history, two groups were created: (I) patients with no known coronary artery disease (CAD), (II) patients with known CAD. All images were scored for the presence of significant (>50 %) stenosis. CAG was the reference test. Fifty-one patients were included. In group I (n = 38), MDCT accurately ruled out significant stenosis in 19/38 (50 %) patients, but could not replace CAG in the remaining 19/38 (50 %) patients due to non-diagnostic image quality (n = 16) or significant stenosis (n = 3) detection. In group II (n = 13), MDCT correctly found no patients without significant stenosis, requiring CAG imaging in all. MDCT assessed patency in 16/19 (84 %) grafts and detected a hostile anatomy in two. MDCT performed for PHV dysfunction assessment can replace CAG (100 % accurate) in approximately half of patients without previously known CAD. (orig.)

  3. Monitoring of smoking-induced emphysema with CT in a lung cancer screening setting : Detection of real increase in extent of emphysema

    NARCIS (Netherlands)

    Gietema, Hester A.; Schilham, Arnold M.; van Ginneken, Bram; van Klaveren, Rob J.; Lammers, Jan Willem J.; Prokop, Mathias

    2007-01-01

    Purose: To retrospectively establish the minimum increase in emphysema score (ES) required for detection of real Increased extent of emphysema with 95% confidence by using multi-detector row computed tomography (CT) in a lung cancer screening setting. Materials and Methods The study was a substudy o

  4. Whole tumour first-pass perfusion using a low-dose method with 64-section multidetector row computed tomography in oesophageal squamous cell carcinoma

    Energy Technology Data Exchange (ETDEWEB)

    Chen Tianwu, E-mail: twchenscu@yahoo.com.cn [Sichuan Province Key Laboratory of Medical Imaging, and Department of Radiology, Affiliated Hospital of North Sichuan Medical College, 63 Wen Hua Lu, Nanchong, Sichuan 637000 (China); Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Yang Zhigang, E-mail: yangzg6666@yahoo.com.cn [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Dong Zhihui, E-mail: dongzhih@163.com [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Li Yuan, E-mail: dr.liyuan@163.com [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Yao Jin, E-mail: shelleyyao@163.com [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Wang Qiling, E-mail: xiaohongmao99@126.com [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China); Qian Lingling, E-mail: moneylinglingch1999@126.com [Department of Radiology, West China Hospital of Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041 (China)

    2011-11-15

    Purpose: To propose a low-dose method at tube current-time product of 50 mAs for whole tumour first-pass perfusion of oesophageal squamous cell carcinoma using 64-section multidetector row computed tomography (MDCT), and to assess the original image quality and accuracy of perfusion parameters. Materials and methods: Fifty-nine consecutive patients with confirmed oesophageal squamous cell carcinomas were enrolled into our study, and underwent whole tumour first-pass perfusion scan with 64-section MDCT at 50 mAs. Image data were statistically reviewed focusing on original image quality demonstrated by image-quality scores and signal-to-noise (S/N) ratios; and perfusion parameters including perfusion (PF, in ml/min/ml), peak enhanced density (PED, in HU), time to peak (TTP, in seconds) and blood volume (BV, in ml/100 g) for the tumour. To test the interobserver agreement of perfusion measurements, perfusion analyses were repeatedly performed. Results: Original image-quality scores were 4.71 {+-} 0.49 whereas S/N ratios were 5.21 {+-} 2.05, and the scores were correlated with the S/N ratios (r = 0.465, p < 0.0001). Mean values for PF, PED, TTP and BV of the tumour were 33.27 {+-} 24.15 ml/min/ml, 24.06 {+-} 9.87 HU, 29.42 {+-} 8.61 s, and 12.45 {+-} 12.22 ml/100 g, respectively. Intraclass correlation coefficient between the replicated measurements of each perfusion parameter was greater than 0.99, and mean difference of the replicated measurements of each parameter was close to zero. Conclusion: Whole tumour first-pass perfusion with 64-section MDCT at low-dose radiation could be reproducible to assess microcirculation in oesophageal squamous cell carcinoma without compromising subjective original image quality of the tumour.

  5. Efficacy of Multidetector-Row Computed Tomography as a Practical Tool in Comparison to Invasive Procedures for Visualization of the Biliary Obstruction

    Science.gov (United States)

    Taheri, Abdolmajid; Rostamzadeh, Ayoob; Gharib, Alireza; Fatehi, Daryoush

    2016-01-01

    Introduction: Recently, multidetector computed tomography (MDCT) has been introduced into clinical practice. MDCT has become the noninvasive diagnostic test of choice for detailed evaluation of biliary obstruction. Aim: the main objective of the present study was to evaluate the diagnostic value of MDCT compared to invasive procedures for detecting biliary obstruction causes. Material and Methods: Since February 2009 until May 2011 fifty biliary obstruction patients based on clinical, laboratory or ultrasonographic findings, were evaluated by Multidetector-row computed tomography. The causes of biliary obstruction, which was identified using. MDCT were classified into three categories: calculus, benign stricture, and malignancy. Final diagnosis was conducted based on percutaneous transhepatic cholangiography (PTC), endoscopic retrograde cholangiopancreatography, biopsy, or surgery. The MDCT diagnosis and were compared with the final diagnosis. Results: A correct diagnosis of causes of biliaryobstruction was made on the basis of MDCT findings for 44 of the total 50 patients. Two patients with chronic pancreatitis were incorrectly diagnosed with a pancreatic head adenocarcinoma on the basis of MDCT findings. One patient with biliary stone was incorrectly diagnosed with a periampullary adenocarcinoma on the basis of MDCT findings. The Sensitivity, specificity and accuracy of MDCT in the diagnosis of causes of biliary obstruction were 94.12% and87.87% and94.6% respectively. Conclusion: Based on the findings of this study MDCT has an excellent image quality, providing valuable information about the biliary tree and other abdominal organs. The use of advanced image processing, including maximum intensity projection and multiplanar reconstruction (especially coronal or sagittal reformatted images), allows superior visualization of the biliary tree and vascular structures. Three-dimensional reconstruction images complement axial images by providing a more anatomically

  6. 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.

  7. Preoperative differentiation between T1a and ≥T1b gallbladder cancer: combined interpretation of high-resolution ultrasound and multidetector-row computed tomography

    International Nuclear Information System (INIS)

    To determine the diagnostic value of combined interpretation of high-resolution ultrasound (HRUS) and multidetector-row computed tomography (MDCT) for preoperative differentiation between T1a and ≥T1b gallbladder (GB) cancer. Eighty-seven patients with pathologically confirmed GB cancers (T1a, n = 15; ≥T1b, n = 72), who preoperatively underwent both HRUS and MDCT, were included in this retrospective study. Two reviewers independently determined the T-stages of the GB cancers on HRUS and MDCT using a five-point confidence scale (5, definitely T1a; 1, definitely ≥T1b). For individual modality interpretation, the lesions with scores ≥4 were classified as T1a, and, for combined modality interpretation, the lesions with all scores ≥4 in both modalities were classified as T1a. The McNemar test was used to compare diagnostic performance. The diagnostic accuracy of differentiation between T1a and ≥T1b GB cancer was higher using combined interpretation (90.8 % and 88.5 % for reviewers 1 and 2, respectively) than individual interpretation of HRUS (82.8 % and 83.9 %) or MDCT (74.7 % and 82.8 %) (P < 0.05, reviewer 1). Combined interpretations demonstrated 100 % specificity for both reviewers, which was significantly higher than individual interpretations (P < 0.05, both reviewers). Combined HRUS and MDCT interpretation may improve the diagnostic accuracy and specificity for differentiating between T1a and ≥T1b GB cancers. circle Differentiating between T1a and ≥T1b gallbladder cancer can help surgical planning. (orig.)

  8. Comparison between Carotid Artery Wall Thickness Measured by Multidetector Row Computed Tomography Angiography and Intimae-Media Thickness Measured by Sonography

    Directory of Open Access Journals (Sweden)

    Živorad N. Savić

    2011-01-01

    Full Text Available The increased thickness of the carotid wall >1 mm is a significant predictor of coronary and cerebrovascular diseases. The purpose of our study was to assess the agreement between multidetector row computed tomography angiography (MDCTA in measuring carotid artery wall thickness (CAWT and color Doppler ultrasound (CD-US in measuring intimae-media thickness (IMT. Eighty-nine patients (aged 35–81 were prospectively analyzed using a 64-detector MDCTA and a CD-US scanner. Continuous data were described as the mean value ± standard deviation, and were compared using the Mann–Whitney U test. A p value <0.05 was considered significant. Bland–Altman statistics were employed to measure the agreement between MDCTA and CD-US. CAWT ranged from 0.62 to 1.60 mm, with a mean value of 1.09 mm. IMT ranged from 0.60 to 1.55 mm, with a mean value of 1.06 mm. We observed an excellent agreement between CD-US and MDCTA in the evaluation of the common carotid artery thickness, with a bias between methods of 0.029 mm (which is a highly statistically important difference of absolute values [t = 43.289; p < 0.01] obtained by paired T test, and limits of agreement from 0.04 to 0.104. Pearson correlation coefficient was 0.9997 (95% CI 0.9996–0.9998; p < 0.01. We conclude that there is an excellent correlation between CAWT and IMT measurements obtained with the MDCTA and CD-US.

  9. 多层螺旋CT首过期灌注成像和肿瘤微血管密度在评价周围型肺癌TNM分期的临床价值%Clinical Value of 16 Slice Spiral CT Perfusion Enhancement Parameters and Histological Microvessel Density in TNM Staging of Peripheral Non-small Cell lung Cancer

    Institute of Scientific and Technical Information of China (English)

    邓东; 武莹莹; 黄仲奎; 龙莉玲; 张小波; 李春兰; 林创武; 曾冠珍; 冯启明

    2011-01-01

    目的 探讨多层螺旋CT首过期灌注强化指标和肿瘤微血管密度(MVD)在肺癌TNM分期的临床价值.资料与片法对32例周嗣型肺癌患者行CT灌注扫描,依据首过期肿块强化的时间-密度曲线(TDC)计算肿瘤的灌注强化指标,按病理结果分为:≤3 cm肺癌组和>3 cm、≤7 cm肺癌组,累及胸膜组和未累及胸膜组;有淋巴结转移组和无淋巴结转移组;TNM分期按Ⅰ~Ⅱ期和Ⅲ~Ⅳ期分两组,并对肿瘤MVD计数.各组观察指标的差异采用t检验或t'检验;将CT灌注强化指标分别与MVD做相关性分析;利用受试者工作特征(ROC)曲线分析MVD和CT灌注强化指标评价肺癌TNM分期的诊断效能.结果 (1)肿块的强化峰值(PH)、肿块与主动脉PH之比(M/A)、灌注值(PV)和MVD在肿块直径≤3 cm与>3 cm、≤7 cm之间[分别为(33.73±20.56)HU、(31.26±13.22)HU;(0.28±0.10)、(0.24±0.14);(1.58±0.83)ml·min-1·ml-1、(1.45±0.81)ml·min-1·ml-1;(73.00±15.03)个/0.74 mm2、(66.42±12.93)个/0.74 mm2]差异均无统计学意义(P>0.05).(2)累及胸膜组的PV和MVD均高于未累及胸膜组[分别为(1.83±0.90)ml·min-1·ml-1、(1.15±0.56)ml·min-1·ml-1;(73.40±10.70)个/0.74 mm2、(62.59±13.65)个/0.74 mm2],差异均有统计学意义(P0.05).(3)肺癌淋巴结转移组的肿块PH、M/A、PV和MVD均高于无淋巴结转移组[分别为(38.76±14.32)HU、(21.44±6.48)HU;(0.28±0.14)、(0.14±0.07);(1.73±0.89)ml·min-1·ml-1、(1.10±0.47)ml.min-1.ml-1;(72.58±10.49)+/o.74 mm2、(60.46±14.15)+/0.74 mm2],差异均有统计学意义(P0.05];当以MVD>71.5+/0.74 mm2或PV>1.16 ml.min-1·ml-1作为判断肺癌TNM分期的诊断阈值时,其敏感性、特异性、诊断符合率分别为86.7%、76.5%、81.13%和73.3%、52.9%、62.5%.结论 肺癌CT灌注强化指标PV和MVD与肺癌TNM分期存在一定相关性,通过确定PV及MVD的临界值有助于肺癌TNM分期的量化诊断.%Objective To investigate the value of 16 slice spiral CT perfusion

  10. Reconstruction of coronary 64-multidetector-row computed tomography angiography in patients with atrial fibrillation. Delete short RR intervals using electorocardiogram

    International Nuclear Information System (INIS)

    The image qualities of coronary 64-multidetector-row computed tomography angiography (CCTA) in patients with atrial fibrillation (Afib) are often not enough. This study clarifies how to use electrocardiogram (ECG)-editing in Afib. We performed CCTA (Aquilion 64 with beam pitch: 0.125, 0.35 s/r) in 33 patients (M/F=24/9, age: 71±9 yr, mean heart rate: 71±12 bpm) with Afib. We injected 5 mg of verapamil into the vein when the mean heart rate (HR) was ≥80 bpm. First, we reconstructed images after deleting short risk ratio (RR) (<800, 750, 700, 650, or 600). Second, we reconstructed images in 4 different methods: (1) end-systolic images with Phase Navi (automatically selecting an optimal phase) (ES-Navi), (2) Mid-diastolic images with Phase Navi (MD-Navi), (3) Mid-diastolic images reconstructed by the ''R + absolute time method'' [Edit-MD (R+)], and (4) Mid-diastolic images reconstructed by the ''R-absolute time method'' [Edit-MD (R-)]. We reconstructed 1 and 2 without ECG-editing, and 3 and 4 were reconstructed after ECG-editing without a data deficit. The quality of the images was classified into 3 ranks: no artifact (3), mild artifact (2), and severe artifact (1). The image quality point of CCTA, reconstructed after deleting RR <750, was similar to RR <800, and RR <750 was even higher than that after deleting HR <600, 650, or 700. The mean image quality point of CCTA that was reconstructed by Edit-MD (R-) or Edit-MD (R+) was significantly higher than ES-Navi or MD-Navi. The high image quality of CCTA could be reconstructed after deleting RR <750 in 76% or after deleting RR <800 in 70% of Afib. The reconstruction using Edit-MD (R-) or Edit-MD (R+) without a data deficit could provide a better quality CCTA than using PhaseNavi in Afib. (author)

  11. Comparison of 16 slice multi-detector computed tomography and breath hold 3D magnetic resonance angiography in the detection of coronary stenosis

    Institute of Scientific and Technical Information of China (English)

    Xin LIU; Zulong CAI; Youquan CAI; Shaohong ZHAO; Ningyu AN; Yuangui GAO

    2006-01-01

    Objective To compare 16-slice multi-detector spiral computed tomography (MDCT) and breathhold 3D magnetic resonance (MR) coronary angiography in the visualization of coronary arteries and the accuracy of detecting significant (> 50%) coronary stenoses in patients with suspected coronary artery disease. Methods Forty patients were examined by 16-slice CT (GE, Lightspeedl6)and MR (GE,Twinspeed) within 3 days; 31 of them underwent conventional coronary angiography (CAG) within 2 weeks after CT and MR scan. CT was performed with 16× 1.25 mm detector collimation, 0.5 s rotation time and images were reconstructed at 60%-75% of the cardiac cycle. MR was performed with breath hold 3D FIESTA (TR4.0 ms, TE1.7 ms, flip angle 65, slice thickness 3 mm, FOV 280 mm, matrix 256× 192). Mean heart rate was 63 ± 5.8 bpm and β-blocker was used in 24 patients. MR and CT image quality was evaluated in 9 coronary segments (RCA1, RCA2, RCA3, LM, LAD1, LAD2, LAD3, LCX1, LCX2) using a four-point grading scale.Sensitivity, specificity, positive predictive value, negative predictive value and accuracy were calculated for detection of significant stenosis using CAG as the gold standard. Results 16-slice CT showed higher image quality in most coronary segments except RCA2.Forty-three segments were diagnosed as significant stenosis by CAG, 36 and 27 of these were correctly detected by CT and MR respectively. Sensitivity, specificity, positive predictive value, and negative predictive value of 16-slice CT and MR for detecting significant stenosis were 83 %, 84 %, 49 %, 97 % and 63 %, 90 %, 55 %, 93 %, respectively. Conclusion Sixteen-slice CT showed higher image quality in most coronary segments excepted for middle RCA. 16-slice CT had higher sensitivity than MR for detection of coronary significant stenosis, whereas MR had higher specificity than CT. Both CT and MR showed high negative predictive value,which is useful for excluding coronary stenosis in symptomatic patients.

  12. 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.)

  13. 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.)

  14. Multi-detector CT angiography for the assessment of anterior spinal artery and artery of Adamkiewicz patency in patients suspected of having thoracic aortic pathology

    Institute of Scientific and Technical Information of China (English)

    Shaohong ZHAO; Laura Logan; Pamela Schraedley; Geoffrey D.Rubin

    2006-01-01

    Objective To evaluate the visualization of the anterior spinal artery (ASA) and the artery of Adamkiewicz (AKA) as well as the affecting factors for the detection rate using multidetector row CT (MDCT). Methods Ninety-nine consecutive patients (31 women and 68 men; age range, 25-90 years; average age 61.3 years) with suspicion for thoracic aortic lesions necessitating surgical intervention (31 aortic aneurysm, 45 dissection, 5 intramural hematoma, and 18 normal), underwent 16-slice MDCT angiography from the aortic arch to the aortic bifurcation. Transverse sections, multiplanar reformations (MPR) and thin maximum intensity projections (MIP) were used to assess the ASA and AKA. The level of the ASA and AKA origins and CT acquisition parameters were recorded. The contrast-to-noise ratio (CNR) of the image, an index of the mass of the T11 body (vertebral mass index), the subcutaneous fat thickness,and the CT value within the aortic arch and at the T11 level were measured. The detection of the ASA and AKA was evaluated relative to the acquisition parameters, scan characteristics, and aortic lesion type. Differences were assessed with Wilcoxon rank-sum and t tests. Results The ASA was visualized in 51 patients (52%) and the AKA in 18 patients (18 %). The ASA was identified in 36/67 (54%)patients with 1.25 mm thickness and in15/32 (47%) patients with 2.5-3.0 mm thickness. This difference did not achieve significance (P=0.13). The detection rate of the ASA and the AKA was influenced by vertebral mass index and the CNR (P<0.05). The amount of subcutaneous fat affected the detection rate of the ASA (P<0.05) but not the AKA. In CT scans with ASA detection, the mean CT values in the aorta at the arch and at T11 were 360 and 358 HU, respectively; whereas in CT scans without ASA detection, the CT values in the aorta at the arch and at T11 were lower (297 and 317 HU, respectively; both P<0.05). Conclusion The ASA and AKA were less frequently detected in our cohorts than

  15. Quantitative thoracic CT techniques in adults: can they be applied in the pediatric population?

    Energy Technology Data Exchange (ETDEWEB)

    Yoon, Soon Ho [Seoul National University Medical Research Center, Department of Radiology, Seoul National University College of Medicine, and Institute of Radiation Medicine, Seoul (Korea, Republic of); Goo, Jin Mo [Seoul National University Medical Research Center, Department of Radiology, Seoul National University College of Medicine, and Institute of Radiation Medicine, Seoul (Korea, Republic of); Seoul National University College of Medicine, Cancer Research Institute, Jongno-gu, Seoul (Korea, Republic of); Goo, Hyun Woo [University of Ulsan College of Medicine, Department of Radiology and Research Institute of Radiology, Asan Medical Center, Seoul (Korea, Republic of)

    2013-03-15

    With the rapid evolution of the multidetector row CT technique, quantitative CT has started to be used in clinical studies for revealing a heterogeneous entity of airflow limitation in chronic obstructive pulmonary disease that is caused by a combination of lung parenchymal destruction and remodeling of the small airways in adults. There is growing evidence of a good correlation between quantitative CT findings and pathological findings, pulmonary function test results and other clinical parameters. This article provides an overview of current quantitative thoracic CT techniques used in adults, and how to translate these CT techniques to the pediatric population. (orig.)

  16. 16层螺旋CT灌注成像强化指标和肿瘤微血管密度与肺癌淋巴结转移的关系%Correlation of 16-slice spiral CT perfusion enhancement parameters and histological microvessel density with lymphatic involvement in peripheral lung cancer

    Institute of Scientific and Technical Information of China (English)

    邓东; 冯启明; 杨新官; 张小波; 龙莉玲; 黄仲奎; 秦宇红; 李春兰; 林创武; 梁玉梅

    2010-01-01

    目的 应用16层MSCT灌注成像定量评价肺癌肿瘤血管生成,并探讨CT灌注成像强化指标和肿瘤微血管密度(MVD)与肺癌淋巴结转移的关系及其价值.方法 对53例周围型肺癌行CT灌注扫描,根据首过期肿块强化的时间-密度曲线(TDC)计算肿瘤的灌注强化指标,根据病理结果分为有淋巴结转移组和无淋巴结转移组,并对肿瘤MVD计数.淋巴结转移组与无转移组各观察指标的差异采用t检验或t'检验;将CT灌注强化指标分别与MVD做相关性分析;利用ROC曲线分析MVD和CT灌注强化指标评价肺癌淋巴结转移的诊断效能.结果 (1)肺癌淋巴结转移组(26例)MVD计数高于无淋巴结转移组(27例),MVD分别为(64.69±16.34)、(42.67±16.78)个/0.74 mm~2(t=4.84,P0.05);当以MVD>52个/0.74 mm~2或PV>1.52 ml·min~(-1)·m~l(-1)作为强烈提示肺癌淋巴结转移的可能性时,其敏感性、特异性、诊断符合率均较高(分别为80.8%、81.5%、81.1%和84.6%、85.2%、84.9%).结论 CT灌注强化指标PV及MVD与肺癌淋巴结转移存在密切关系,PV可作为术前判断肺癌淋巴结转移的重要指标之一.%Objective To evaluate the clinical value of CT perfusion (CTP) imaging for providing quantitative information about angiogenesis in patients with lung carcinoma and investigate the correlation of CTP enhancement parameters and histological microvessel density (MVD) with lymphatic involvement in peripheral lung carcinoma. Methods Fifty-three patients with pathology-proved peripheral lung carcinoma underwent CT perfusion scan before operation. The enhancement parameters of CTP were calculated based on the time-density curves (TDC) of fist pass phase. All cases were classified into two groups according to pathologic results: tumor with and without lymph node involvement. Two-sample t test was used for the statistics. The ROC curve was used to assess the efficiency of the enhancement parameters of CT perfusion and MVD for predicting

  17. Evaluation to Obtain the Image According to the Spatial Domain Filtering of Various Convolution Kernels in the Multi-Detector Row Computed Tomography

    International Nuclear Information System (INIS)

    Our objective was to evaluate the image of spatial domain filtering as an alternative to additional image reconstruction using different kernels in MDCT. Derived from thin collimated source images were generated using water phantom and abdomen B10(very smooth), B20(smooth), B30(medium smooth), B40 (medium), B50(medium sharp), B60(sharp), B70(very sharp) and B80(ultra sharp) kernels. MTF and spatial resolution measured with various convolution kernels. Quantitative CT attenuation coefficient and noise measurements provided comparable HU(Hounsfield) units in this respect. CT attenuation coefficient(mean HU) values in the water were values in the water were 1.1∼1.8 HU, air(-998∼-1000 HU) and noise in the water(5.4∼44.8 HU), air(3.6∼31.4 HU). In the abdominal fat a CT attenuation coefficient(-2.2∼0.8 HU) and noise(10.1∼82.4 HU) was measured. In the abdominal was CT attenuation coefficient(53.3∼54.3 HU) and noise(10.4∼70.7 HU) in the muscle and in the liver parenchyma of CT attenuation coefficient(60.4∼62.2 HU) and noise (7.6∼63.8 HU) in the liver parenchyma. Image reconstructed with a convolution kernel led to an increase in noise, whereas the results for CT attenuation coefficient were comparable. Image scanned with a high convolution kernel(B80) led to an increase in noise, whereas the results for CT attenuation coefficient were comparable. Image medications of image sharpness and noise eliminate the need for reconstruction using different kernels in the future. Adjusting CT various kernels, which should be adjusted to take into account the kernels of the CT undergoing the examination, may control CT images increase the diagnostic accuracy.

  18. Multidetector-row computed tomography (MDCT) for the diagnosis of hepatocellular carcinoma in cirrhotic candidates for liver transplantation: prevalence of radiological vascular patterns and histological correlation with liver explants

    International Nuclear Information System (INIS)

    To define the prevalence of different multidetector-row computed tomography (MDCT) vascular patterns and their histopathological correlation with liver explants, and to evaluate the accuracy of MDCT for the diagnosis of hepatocellular carcinoma (HCC). We retrospectively reviewed 125 cirrhotic patients imaged by MDCT before liver transplantation. Three main vascular patterns were identified: hypervascular lesion with washout (Hyper-L-Wo), hypervascular lesion without washout (Hyper-L) and non-hypervascular lesion (Hypo-L). Radiological findings were matched with histopathology of explants. Positive predictive value (PPV) and likelihood ratio (LR) were 95% and 18.66, respectively, for Hyper-L-Wo; 45% and 0.82 for Hyper-L; and 75% and 3 for Hypo-L of 20 mm or larger. Overall accuracy of MDCT for detection and characterisation of HCC was 89% and 43%, respectively. Sensitivity of MDCT for detection and characterisation was related to the lesion size, ranging from 78% (lesion smaller than 10 mm) to 98% (larger than 20 mm) and from 9% to 64%, respectively. MDCT established the accurate stage of disease in 46% of the patients, underestimated in 52% and overestimated in 2%. In cirrhotic patients, any Hyper-L-Wo detected by MDCT can be confidently considered to be HCC. Hyper-L larger than 10 mm and Hypo-L of 20 mm or larger are at high risk of HCC. However, even using MDCT and the newest imaging protocols, imaging underestimated the diagnosis of small HCC. (orig.)

  19. Multidetector-row computed tomography in the preoperative diagnosis of intestinal complications caused by clinically unsuspected ingested dietary foreign bodies: a case series emphasizing the use of volume rendering techniques

    Directory of Open Access Journals (Sweden)

    Augusto Cesar Vieira Teixeira

    2013-12-01

    Full Text Available Objective The present study was aimed at describing a case series where a preoperative diagnosis of intestinal complications secondary to accidentally ingested dietary foreign bodies was made by multidetector-row computed tomography (MDCT, with emphasis on complementary findings yielded by volume rendering techniques (VRT and curved multiplanar reconstructions (MPR. Materials and Methods The authors retrospectively assessed five patients with surgically confirmed intestinal complications (perforation and /or obstruction secondary to unsuspected ingested dietary foreign bodies, consecutively assisted in their institution between 2010 and 2012. Demographic, clinical, laboratory and radiological data were analyzed. VRT and curved MPR were subsequently performed. Results Preoperative diagnosis of intestinal complications was originally performed in all cases. In one case the presence of a foreign body was not initially identified as the causal factor, and the use of complementary techniques facilitated its retrospective identification. In all cases these tools allowed a better depiction of the entire foreign bodies on a single image section, contributing to the assessment of their morphology. Conclusion Although the use of complementary techniques has not had a direct impact on diagnostic performance in most cases of this series, they may provide a better depiction of foreign bodies' morphology on a single image section.

  20. Multidetector-row computed tomography in the preoperative diagnosis of intestinal complications caused by clinically unsuspected ingested dietary foreign bodies: a case series emphasizing the use of volume rendering techniques

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Augusto Cesar Vieira; Torres, Ulysses dos Santos; Oliveira, Eduardo Portela de; Gual, Fabiana; Bauab Junior, Tufik, E-mail: usantor@yahoo.com.br [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Hospital de Base. Serv. de Radiologia e Diagnostico por Imagem; Westin, Carlos Eduardo Garcia [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Hospital de Base. Cirurgia Geral; Cardoso, Luciana Vargas [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Hospital de Base. Setor de Tomografia Computadorizada

    2013-11-15

    Objective: the present study was aimed at describing a case series where a preoperative diagnosis of intestinal complications secondary to accidentally ingested dietary foreign bodies was made by multidetector-row computed tomography (MDCT), with emphasis on complementary findings yielded by volume rendering techniques (VRT) and curved multiplanar reconstructions (MPR). Materials and Methods: The authors retrospectively assessed five patients with surgically confirmed intestinal complications (perforation and/or obstruction) secondary to unsuspected ingested dietary foreign bodies, consecutively assisted in their institution between 2010 and 2012. Demographic, clinical, laboratory and radiological data were analyzed. VRT and curved MPR were subsequently performed. Results: preoperative diagnosis of intestinal complications was originally performed in all cases. In one case the presence of a foreign body was not initially identified as the causal factor, and the use of complementary techniques facilitated its retrospective identification. In all cases these tools allowed a better depiction of the entire foreign bodies on a single image section, contributing to the assessment of their morphology. Conclusion: although the use of complementary techniques has not had a direct impact on diagnostic performance in most cases of this series, they may provide a better depiction of foreign bodies' morphology on a single image section. (author)

  1. Multidetector-row computed tomography in the preoperative diagnosis of intestinal complications caused by clinically unsuspected ingested dietary foreign bodies: a case series emphasizing the use of volume rendering techniques

    International Nuclear Information System (INIS)

    Objective: the present study was aimed at describing a case series where a preoperative diagnosis of intestinal complications secondary to accidentally ingested dietary foreign bodies was made by multidetector-row computed tomography (MDCT), with emphasis on complementary findings yielded by volume rendering techniques (VRT) and curved multiplanar reconstructions (MPR). Materials and Methods: The authors retrospectively assessed five patients with surgically confirmed intestinal complications (perforation and/or obstruction) secondary to unsuspected ingested dietary foreign bodies, consecutively assisted in their institution between 2010 and 2012. Demographic, clinical, laboratory and radiological data were analyzed. VRT and curved MPR were subsequently performed. Results: preoperative diagnosis of intestinal complications was originally performed in all cases. In one case the presence of a foreign body was not initially identified as the causal factor, and the use of complementary techniques facilitated its retrospective identification. In all cases these tools allowed a better depiction of the entire foreign bodies on a single image section, contributing to the assessment of their morphology. Conclusion: although the use of complementary techniques has not had a direct impact on diagnostic performance in most cases of this series, they may provide a better depiction of foreign bodies' morphology on a single image section. (author)

  2. Evaluation of reconstructed orbital wall fractures: high-resolution MRI using a microscopy surface coil versus 16-slice MSCT

    Energy Technology Data Exchange (ETDEWEB)

    Wiener, E.; Settles, M.; Rummeny, E. [Institut fuer Roentgendiagnostik, Klinikum rechts der Isar, Munich (Germany); Kolk, A.; Neff, A. [Klinik fuer Mund-Kiefer-Gesichtschirurgie, Klinikum rechts der Isar, Munich (Germany)

    2005-06-01

    We evaluated high-resolution magnetic resonance imaging (MR) using a 47-mm microscopy surface coil in comparison to 16-slice multislice CT (MSCT) for postsurgical imaging of reconstructed orbital walls. Twenty-five patients with 27 internal orbital wall fractures were imaged prospectively after reconstruction with resorbable polydioxanone sulfate (PDS) sheets. Coronal high-quality T1- and T2-weighted MR images were obtained with an in-plane resolution of 350 {mu}m within a measure time of 6-7 min for each sequence. Nineteen symptomatic patients underwent MSCT as the current gold standard. In MRI the PDS foil appears in T1- and T2-weighted images as a thin, low-signal-intensity linear structure. In CT it appears hyperdense in comparison to soft tissue and slightly hypodense in comparison to cortical bone. PDS foils could be clearly depicted in 20 out of 25 patients (80%) with MRI and in 13 out of 19 patients (68%) with MSCT. An inadequate foil position or size could be diagnosed in eight patients with MRI and in only three patients with MSCT. In ten symptomatic patients secondary surgery could be avoided because of regular MRI findings except mild hematoma and muscle edema. High-resolution MRI of the orbit using a 47-mm microscopy coil is a promising method to accurately demonstrate normal and pathologic conditions in symptomatic patients after orbital wall reconstruction with PDS foils. (orig.)

  3. The measurement of position of retromandibular vein with multi-detector row helical CTA in relation to the mandibular angle plasty.%下颌角手术相关颌后静脉走行的CTA研究

    Institute of Scientific and Technical Information of China (English)

    王燕; 华泽权; 刘文元; 李树华

    2012-01-01

    目的:应用CTA(血管造影术)影像测量颌后静脉与下颌角手术相关解剖,为避免手术中损伤颌后静脉提供指导.方法:选择30名正常成人下颌角及周围血管CTA扫描图像,应用ADW4.2图像处理软件测量颌后静脉距下颌角处颌骨各边缘的三维解剖位置.结果:颌后静脉距下颌角点的距离为(11.26±2.34) mm;在下颌角点上10 mm处距下颌骨后缘为(8.18±2.12) mm;在下颌角点上20 mm处距下颌骨后缘为(6.38±2.12) mm;在下颌角点上30 mm处距下颌骨后缘为(3.18±2.12) mm,在下颌角点上40 mm处距下颌骨后缘为(2.18±1.16) mm.结论:在下颌骨后缘手术时位置越高颌后静脉距下颌骨越近,手术越容易损伤颌后静脉;参照测量获得的解剖数据在下颌角成型手术中能避免损伤面前静脉及颌后静脉.%Objective: The aim of this study was to investigate the position and course of retromandibular vein using multi-detector row helical computed tomographic angiography (CTA)imaging and to relate the findings to performing the mandibular angle ptasty. Method: thirty of adulty human were selected for multi-detector row helical CTA measurement and ADW4.2 software analysis, according with a distance from the retromandibular vein to mandibular angle.at 10 mm urper the mandibular angletat 20 mm urper the mandibular angle,at 30 mm urper the mandibular angle, and at 40 mm urper the mandibular angle, retromandibular vein was examined. Result: the distance from the retromandibular vein to the mandibular angle is(11.26±2.34)mm.al 10 mm urper the mandibular angle is (8.18±2.12)mm.at 20 mm urper the mandibular angle is (6.38±2.12)mm,at 30 mm urper the mandibular angle is (3.18±2.12)mm,at 40 mm urper the mandibular angle is (2.18± 1.16)mm.Conclusion:The study is to provide further understanding of the retromandibular vein anatomy in relation to the design of the mandibuler angle plasty and to create clinical safety guidelines in order to avoid damaging the facial vein and the retromandibular vein.

  4. Congenital tracheoesophageal fistula successfully diagnosed by CT esophagography

    Institute of Scientific and Technical Information of China (English)

    Koichi Nagata; Yoshito Kamio; Tamaki Ichikawa; Mitsutaka Kadokura; Akihiko Kitami; Shungo Endo; Haruhiro Inoue; Shin-Ei Kudo

    2006-01-01

    Tracheoesophageal fistula (TEF) or bronchoesophageal fistula may be congenital, inflammatory, neoplastic,or secondary to trauma. Congenital TEF or bronchoesophageal fistula is usually associated with esophageal atresia and is readily diagnosed in infancy.But if it is not associated with esophageal atresia, it may persist until adulthood. Some theories have been proposed to explain this delay in diagnosis. We present a case of a 70-year-old man with congenital TEF. The TEF was successfully diagnosed by multidetector-row CT esophagography.

  5. Differentiation of Malignant and Benign Incidental Breast Lesions Detected by Chest Multidetector-Row Computed Tomography: Added Value of Quantitative Enhancement Analysis.

    Directory of Open Access Journals (Sweden)

    Yu-Pang Lin

    Full Text Available To retrospectively determine the association between breast lesion morphology and malignancy and to determine the optimal value of lesion enhancement (HU, Hounsfield units to improve the diagnostic accuracy of breast cancer in patients with incidental breast lesions (IBLs. A total of 97 patients with 102 IBLs detected from July 2009 to December 2012 were enrolled in this study. Two radiologists analyzed CT images for the presence of malignancy based on the morphology of the lesions alone and in combination with an enhancement value (HU analysis. There were 36 malignant and 66 benign IBLs. When the morphology and enhancement values were combined, the sensitivity, specificity, and accuracy were 92%, 97%, and 95%, respectively, for reader 1 and 89%, 94%, and 92%, respectively, for reader 2. The addition of HU values led to correct changes in the diagnosis; specifically, the accuracy of the diagnosis of reader 1 and reader 2 improved by 6.9% and 11.8%, respectively. The addition of the enhancement value (HU to the CT morphology improved the diagnostic accuracy in the differentiation of malignant from benign IBLs by using the region of interest (ROI to measure the HU within the most suspicious part of the lesion.

  6. Principle and applications of dual source CT

    Science.gov (United States)

    Flohr, Thomas

    2008-08-01

    Dual source CT (DSCT) has the potential to solve remaining limitations of conventional multi-detector row CT (MDCT)-scanners, such as insufficient temporal resolution for ECG-controlled cardiac imaging. A DSCT is equipped with two X-ray tubes and two corresponding detectors that are mounted onto the rotating gantry with an angular offset of 90°. The key benefit of DSCT for cardiac scanning is improved temporal resolution equivalent to a quarter of the gantry rotation time (83 ms at 0.33 s rotation time). Additionally, both X-ray tubes can be operated at different kV- and mA-settings, enabling the acquisition of dual energy data. The acquisition of dual energy CT data can add functional information to the morphological information based on different X-ray attenuation coefficients that is usually obtained in a CT examination.

  7. CT urography

    Energy Technology Data Exchange (ETDEWEB)

    Korobkin, M. [Dept. of Radiology, Univ. of Michigan, Ann Arbor, MI (United States)

    2005-11-15

    With the advent of multidetector row CT scanners, evaluation of the urothelium of the entire urinary tract with high-resolution thin sections during a single breath-hold has become a reality. Multidetector CT urography (MDCTU) is a single examination that allows evaluation of potential urinary tract calculi, renal parenchymal masses, and both benign and malignant urothelial lesions. Initial results with this new technique are encouraging. Current investigations of MDCTU focus on methods to improve opacification and distension of the upper urinary tract - the collecting systems, pelvis, and ureters. The role of abdominal compression, infusion of saline and/or furosemide, and optimal time delay of excretory phase imaging is being explored. Upper tract urothelial malignancies, including small lesions less the 5 mmin diameter, can be detected with high sensitivity. Methods to reduce radiation exposure are being explored, including split-bolus contrast injection techniques that combine nephrographic and excretory phases into a single phase. It is likely that in the near future, radiological evaluation of significant unexplained hematuria or of known or prior urothelial malignancy will consist of a single examination - MDCTU. (orig.)

  8. Evaluation of pituitary adenomas by multidirectional multislice dynamic CT

    International Nuclear Information System (INIS)

    Purpose: Multidetector-row CT is a new technology with a short scanning time. Multislice dynamic CT (MSDCT) in various directions can be obtained using the multidetector-row CT with multiplanar reformatting (MPR) technique. Material and Methods: We evaluated the initial results of sagittal and coronal MSDCT images reconstructed by MPR (MSDCT-MPR) in 3 pituitary adenoma patients with a pacemaker. Results: In a patient with microadenoma, the maximum contrast between the normal anterior pituitary gland and the adenoma occurred approximately 50 s after the start of the contrast medium injection. A microadenoma was depicted as a less enhanced area relative to normal pituitary tissue. The macroadenomas were depicted as a less enhanced mass with cavernous sinus invasion in 1 patient and as a non-uniformly enhanced mass in another patient. Bone destruction and incomplete opening of the sellar floor during previous surgery were clearly detected in 2 patients with macroadenomas. These pituitary adenomas were removed via the transnasal route based on information from the MSDCT-MPR images only. The findings were verified surgically. Conclusion: The MSDCT-MPR provided the information needed for surgery with good image quality in the 3 patients with pacemakers. MSDCT-MPR appears to be a useful technique for patients with a pituitary adenoma in whom MR imaging is not available. This is the first report, to our knowledge, of the MSDCT-MPR technique being used to demonstrate pituitary disorders

  9. Comparison of 16-slice MSCT and MRI in the assessment of squamous cell carcinoma of the oral cavity

    Energy Technology Data Exchange (ETDEWEB)

    Wiener, Edzard [Department of Diagnostic Radiology, University of Technology Munich, Ismaninger Str. 22, D-81675 Munich (Germany); Pautke, Christoph [Department of Oral and Maxillofacial Surgery, University of Technology Munich, Ismaninger Str. 22, D-81675 Munich (Germany); Link, Thomas M. [Department of Radiology, University of California, San Francisco, 400 Parnassus Avenue A367, San Francisco, CA 94143 (United States); Neff, Andreas [Department of Oral and Maxillofacial Surgery, University of Technology Munich, Ismaninger Str. 22, D-81675 Munich (Germany); Kolk, Andreas [Department of Oral and Maxillofacial Surgery, University of Technology Munich, Ismaninger Str. 22, D-81675 Munich (Germany)]. E-mail: andreas.kolk@gmx.de

    2006-04-15

    The goal of this retrospective study was to assess the accuracy of 16-slice multislice CT (MSCT) and MRI in staging of patients with primary squamous cell carcinoma (SCC) of the oral cavity. Fifty-two patients with histologically proven primary SCC were examined with contrast enhanced MSCT and MRI at 1.5 T with a combined head and surface neck coil. Image modalities were evaluated in a blinded fashion by two radiologists and an oral-maxillofacial surgeon in consensus concerning tumour depiction, local tumour infiltration and cervical lymph node metastases. Results of the radiological assessment were correlated with the intraoperative and histopathological findings in all patients. 36 of 52 primary tumours (69.2%) were depicted by MSCT while 44 were localized by MRI (84.6%). Regarding muscle infiltration MRI versus MSCT had a sensitivity of 81.8% versus 72.7%, but a low specificity and an accuracy of 63.4% versus 61% and 67.3% versus 63.5%, respectively, were found. There was a trend towards a better detection of bony infiltration by MRI than MSCT with a sensitivity of 100% versus 71.4%, a specificity of 93.3% versus 95.5% and an accuracy 94.2% versus 92.3%, respectively. Detection of cervical lymph node involvement was similar for MRI and MSCT with a sensitivity of 84.2% and 78.9%, a specificity of 63.6% and 75.7% and an accuracy of 71.1% and 76.9%, respectively. For N-staging both methods failed to detect small metastasis. For T-staging MRI was superior to MSCT, because there was a tendency to underestimate the tumour size by MSCT more often (19.4% versus 6.8% by MRI). Therefore, pre-operative MRI is recommended as the basic imaging modality of choice for treatment planning of oral SCC. MSCT is a valid alternative imaging method especially in cases with low patient compliance.

  10. Association between coronary artery calcification score as assessed by multi-detector row computed tomography and cardiovascular risk factors%冠状动脉钙化积分与冠心病危险因素的相关性

    Institute of Scientific and Technical Information of China (English)

    张剑; 韩雅玲; 荆全民; 王效增; 李毅; 张磊; 霍勇; 张岩

    2011-01-01

    Objective The coronary artery calcification (CAC) score determined by multi-detector row computed tomography ( MDCT) predicts the onset of coronary artery disease (CAD). In addition, cardiovascular risk factors also predict the mortality of CAD. Therefore, the aim of this study was to assess whether or not the CAC score is associated with cardiovascular risk factors. Methods A total of 9847 consecutive patients with suspected coronary artery disease underwent coronary angiography between January 2001 and March 2007 at 20 centers of China were enrolled. The subjects consisted of 311 consecutive patients with suspected CAD who underwent MDCT. The body mass index, blood pressure, blood glucose, and serum total cholesterol, triglyceride and low-density lipoprotein cholesterol ( LDL-C) and high-density lipoprotein cholesterol ( HDL-C) were measured. Results When the patients were divided into three groups according to the CAC score [low (0-12 IU), intermediate ( 13 - 445 ) and high ( 5* 446) ], the classification score was significantly associated with age, prevalence of cardiovascular history and diabetes mellitus and HDL-C. In multivariate logistic regression analysis, age ( P = 0. 013) and plasma levels of high-density lipoprotein cholesterol ( P = 0.020 ) remained significant independent variables for the classification. Conclusions Age, prevalence of cardiovascular history and diabetes mellitus and HDL-C were significantly associated with the classification according to the CAC score. The detection of CACS by MSCT could provide reliable and efective evidence for diagnosis of CHD in patients with cardiovascular risk factors.%目的 经多层冠状动脉CT检查测定的冠状动脉钙化积分对冠心病的诊断具有一定预测价值.而冠心病的危险因素与冠心病的发生、发展、结局和预后密切相关.我们旨在探讨冠状动脉钙化积分与冠心病诸多危险因素之间是否具有相关性.方法 入选2001年1月至2007年3月在全国20家医院住院疑诊冠心病患者,采用16排或64排螺旋CT进行冠状动脉增强扫描,并运用自动分析软件进行冠脉钙化积分分析,共入选患者311例,根据冠状动脉钙化积分值分为低分值组(0~12)、中分值组(13 ~445)和高分值组(446以上),比较冠状动脉钙化积分与冠心病危险因素之间的关系.结果 不同冠状动脉钙化积分分组之间,平均年龄、冠心病家族史比例、高密度脂蛋白数值和糖尿病比例等方面存在差异,P <0.05.多元Logistic回归分析显示,疑诊冠心病患者年龄(OR=1.061,95% CI 1.004~1.121,P=0.036)和低HDL-C水平(OR=0.321,95%CI0.113 ~0.909,P=0.032)是冠状动脉钙化积分的显著相关危险因素.结论 年龄、冠心病家族史、低HDL和糖尿病等冠心病危险因素与冠状动脉钙化密切相关,合并多种冠心病危险因素的患者,尤其是老年和低HDL-C患者,行多层冠状动脉CT检查及冠状动脉钙化积分测定,对冠心病的早期诊断具有一定帮助.

  11. Emergencies in the retroperitoneum: assessment of spread of disease by helical CT

    Energy Technology Data Exchange (ETDEWEB)

    Scialpi, M. E-mail: michelescialpi@libero.it; Scaglione, M.; Angelelli, G.; Lupattelli, L.; Resta, M.C.; Resta, M.; Rotondo, A

    2004-04-01

    Acute pancreatitis, leaking abdominal aortic aneurysm, and renal trauma frequently occur in the setting of patients with abdominal nontraumatic and traumatic injury; it represents the most urgent conditions that may determine the presence of fluid collections or haematoma in the retroperitoneum. Single spiral CT and multidetector-row CT (MDCT) play an important role in diagnosis of retroperitoneal emergencies, providing useful informations on the type, site, extent and management of the fluid collections. An accurate CT assessment requires the awareness of the existence of dissectable retroperitoneal fascial planes. Fluid collections or haematoma tends to escape the retroperitoneal site of origin into planes extend from the diaphragm to the pelvic floor. We assess the multicompartimental anatomy of the retroperitoneum and the pathway of spread of the most frequent retroperitoneal fluid collections or haematoma by helical CT.

  12. Assessment of 82 Live Potential Renal Donors with Multi Detector Row Helical CT Angiography (MDCTA

    Directory of Open Access Journals (Sweden)

    R. Javadrashid

    2008-01-01

    Full Text Available Background/Objective: To retrospectively review the authors' experience with multi-detector row helical computed tomography (CT in assessing 82 consecu-tive alive potential renal donors."nPatients and Methods: Eighty-two potential renal donors underwent multi-detector row CT assess-ment, using a 64-slice scanner (Somatom Sensation, Siemens with 0.6-mm slice thickness followed by maximum intensity projection and volume rendering techniques post-processing algorithms. Arterial phase and venous phase examinations were performed. De-layed tomograms were acquired to visualize the col-lecting system anatomy. Two vascular radiologists prospectively interpreted the multi-detector row CT images. Forty candidates subsequently underwent donor nephrectomy. Surgical findings served as the reference standard for 40 kidneys. The imaging find-ings in all 82 candidates (164 kidneys were reviewed, although these findings were considered observa-tional data only because there was no reference stan-dard for 124 kidneys."nResults: Identification of vascular anomalies was best on direct viewing of the axial images using interactive scrolling through the images and cine-loop paging. In 164 kidneys evaluated, a single renal artery was pre-sent in 74.5% and a single renal vein in 87.5%. Mul-tiple renal arteries were more common on the right side (37.8% vs. the left side (20.7%. Early branching of the arteries was seen with equal frequency (10% on either side. Multiple renal veins were more often on the right side (20% vs. the left side (5%. CT an-giographic findings were concordant with the intra-operative findings in 100% of the cases that under-went nephrectomy. CT also revealed cortical cysts (four cases, duplex collecting system (two cases, hy-dronephrosis (one case, renal stone (one case, and liver hemangiomas (two cases. There was no signifi-cant interobserver disagreement between the vascular radiologists."nConclusion: CT angiography is highly accurate for

  13. Value of applying 16-slice CTA to the diagnosis of acute cerebral aneurysm%16层螺旋CTA在急诊脑动脉瘤中的应用价值

    Institute of Scientific and Technical Information of China (English)

    张荣恒; 高江晖; 马洪宇; 郭文伟

    2014-01-01

    目的:探讨16层螺旋CT血管造影( CT angiography , CTA)对颅内动脉瘤的诊断价值。方法:对56例急诊蛛网膜下腔出血( subarachnoid hemorrhage ,SAh)患者行头部16层螺旋CTA检查,对照数字减影血管造影( Digital Subtraction Angiography , DSA)结果,评估16层螺旋CTA诊断动脉瘤的准确性。结果:56例中DSA检查发现59个动脉瘤,16层螺旋CTA检查发现56个动脉瘤,CTA诊断颅内动脉瘤的敏感性为94.6%,特异性为100%,准确性95%。结论:16层螺旋CTA可获得与DSA相近的检查结果,具有较高的敏感性和特异性,快捷,无创,可代替DSA进行筛查及术前评估颅内动脉瘤。%Objective:To determine the clinical value of applying 16-slice CTA to the diagnosis of acute cerebral aneurysms .Meth-ods:56 patients with acute subarachnoid hemorrhage were diagnosed by using 16-slice CTA , Compare the result of the DSA , Evaluate the accuracy of the 16-slice CTA in the diagnosis of aneurysms .Results:59 aneurysms were detected by DSA , 56 aneurysms were detec-ted by CTA, the sensitivity, specificity and accuracy were 94.6%, 100%, 95 respectively.Conclusion:16-slice CTA and DSA can be obtained similar results, it has higher sensitivity and specificity , fast, non-invasive, it can replace DSA screening and preoperative eval-uation of intracranial aneurysms .

  14. Multidetector CT in evaluating blood supply of hepatocellular carcinoma after transcatheter arterial chemoembolization

    Institute of Scientific and Technical Information of China (English)

    Yong-Song Guan; Xiao-Hua Zheng; Xiang-Ping Zhou; Juan Huang; Long Sun; Xian Chen; Xiao Li; Qing He

    2004-01-01

    AIM: To assess the value of multidetector-row computed tomography (MDCT) in choosing retreatment methods of hepatocellular carcinoma (HCC) through evaluating the blood supply of low-density area of HCC after transcatheter arterial chemoembolization (TACE).METHODS: Thirty-two patients with HCC after TACE treatment were examined by plain scanning and hepatic multidetector-row CT. The location of low-density area on plain scanning and the enhancement patterns on dynamic contrast-enhanced scanning were observed. At the same time, three-dimensional CT (3D CT) models of the volume rendering, curved multiplanar reformations, surface shaded display and maximum intensity projection reconstruction of the hepatic artery and portal vein were performed in 6 cases.RESULTS: In CT plain scanning data, low density areas of 32 cases of HCC after TACE treatment were divided into three types: peripheral, one-side-located and mixed types.In contrast-enhanced CT scans, the blood supply of lowdensity area was classified into four types: arterial blood supply (20 cases), portal blood supply (5 cases), arterial combined with portal blood supply (5 cases) and poor blood supply (2 cases). In 6 cases, the relationship between the low-density area and branches of hepatic artery as well as portal vein was shown by 3D CT.CONCLUSION: Hepatic MDCT is an effective method for evaluating the blood supply of low-density area and therapeutic effect of HCC after TACE treatment. Types of blood supply is helpful for the selection of retreatment.

  15. Technical principles of dual source CT

    Energy Technology Data Exchange (ETDEWEB)

    Petersilka, Martin [Siemens Health Care, Forchheim (Germany)], E-mail: martin.petersilka@siemens.com; Bruder, Herbert; Krauss, Bernhard; Stierstorfer, Karl [Siemens Health Care, Forchheim (Germany); Flohr, Thomas G. [Siemens Health Care, Forchheim (Germany); Department of Diagnostic Radiology, Eberhard-Karls-Universitaet, Tuebingen (Germany)

    2008-12-15

    During the past years, multi-detector row CT (MDCT) has evolved into clinical practice with a rapid increase of the number of detector slices. Today's 64 slice CT systems allow whole-body examinations with sub-millimeter resolution in short scan times. As an alternative to adding even more detector slices, we describe the system concept and design of a CT scanner with two X-ray tubes and two detectors (mounted on a CT gantry with a mechanical offset of 90 deg.) that has the potential to overcome limitations of conventional MDCT systems, such as temporal resolution for cardiac imaging. A dual source CT (DSCT) scanner provides temporal resolution equivalent to a quarter of the gantry rotation time, independent of the patient's heart rate (83 ms at 0.33 s rotation time). In addition to the benefits for cardiac scanning, it allows to go beyond conventional CT imaging by obtaining dual energy information if the two tubes are operated at different voltages. Furthermore, we discuss how both acquisition systems can be used to add the power reserve of two X-ray tubes for long scan ranges and obese patients. Finally, future advances of DSCT are highlighted.

  16. Important information about the multislice CT examination technique: a practical guide

    International Nuclear Information System (INIS)

    The increasing number of rowes in modern multidetector-row CT is resulting in continuously shorter scan times with greater spatial resolution. Although technically possible, it is not always useful to perform all examinations with submillimeter resolution. Instead, the resolution should be adapted as a function of the field of view and the current matrix size of 512 x 512 pixels. Contrast agent administration is becoming more sophisticated. Due to the short scan times, faster flow speeds and higher contrast agent concentrations must be used. Bolus triggering with a test bolus has become mandatory. The dose which normally increases exponentially as the resolution increases is reduced when a greater noise is acceptable. Automatic dose regulation allows precise adjustment to the examined body region and the patient size

  17. Comparison of digital subtraction angiography, CT angiography, and ultrasonic doppler examination in the evaluation of penile arterial lesions

    Energy Technology Data Exchange (ETDEWEB)

    Kawanisi, Yasuo; Kimura, Kazunori; Lee, Kyong Soo; Koizumi, Takahiro; Nakatsuji, Hiroyoshi; Kojima, Keiji; Yamamoto, Akira; Numata, Akira [Takamatsu Red Cross Hospital (Japan)

    2001-11-01

    CT angiography reconstructed by a multidetector-row helical CT scanner is a newly developed form of imaging. We compared CT angiography and ultrasonic Doppler examination with digital subtraction angiography (DSA) in the diagnosis of arterial lesion. Eighteen patients with arteriogenic erectile dysfunction (ED) underwent color Doppler study DSA, and CT angiography after providing informed consent. The CT angiography images were obtained by a multidetector-row helical CT scanner, Asteion TSX021A (TOSHIBA). We injected prostaglandin E{sub 1} into the penile cavernous body, and then rapidly infused nonionic contrast medium into the antecubital vein. DSA and CT angiography images of the bilateral internal pudendal arteries and cavernous arteries were examined for stenotic lesions or occlusion. We also compared the peak systolic blood flow velocity in the cavernous artery measured by color Doppler ultrasound with CT angiography and DSA. The CT anigography and color Doppler studies were performed on an outpatient basis, but DSA required hospitalization. In the 36 internal pudendal arteries, DSA represented 22 normal arteries and 14 stenosis or occlusions. CT angiography showed 15 normal arteries and 21 occlusions. For the diagnosis of stenosis or occlusion in the internal pudendal artery, the CT angiography image had a good agreement, with a sensitivity of 1.00, specificity of 0.68, and accuracy of 0.81. For diagnosis in the cavernous artery, CT angiography image also showed a good agreement with DSA; however, the quality of the images of fine arteries was better in the DSA images. The inferior view and internal view of the pelvis in CT angiography were helpful for visulaizing the internal pudendal artery, especially at the pubic bone. There was insufficient correlation between peak systolic blood flow velocity and DSA findings. There were no serious complications involved in either examination. CT angiography has not yet reached the same level as DSA in the evaluation

  18. Detection of hypervascular hepatocellular carcinoma: Comparison of multi-detector CT with digital subtraction angiography and Lipiodol CT

    Institute of Scientific and Technical Information of China (English)

    Xiao-Hua Zheng; Yong-Song Guan; Xiang-Ping Zhou; Juan Huang; Long Sun; Xiao Li; Yuan Liu

    2005-01-01

    AIM: The purpose of this study was to compare the diagnostic accuracy of biphasic multi-detector row helical computed tomography (MDCT), digital subtraction angiography (DSA)and Lipiodol computed tomography (CT) in detection of hypervascular hepatocellular carcinoma (HCC).METHODS: Twenty-eight patients with nodular HCC underwent biphasic MDCT examination: hepatic arterial phase (HAP) 25 s and portal venous phase (PVP) 70 s after injection of the contrast medium (1.5 mL/kg). They also underwent hepatic angiography and intra-arterial infusion of iodized oil. Lipiodol CT was performed 3-4 wk after infusion. MDCT images were compared with DSA and Lipiodol CT images for detection of hepatic nodules.RESULTS: The three imaging techniques had the same sensitivity in detecting nodules >20 mm in diameter. There was no significant difference in the sensitivity among HAP-MDCT, Lipiodol CT and DSA for nodules of 10-20 mm in diameter. For the nodules <10 mm in diameter, HAP-MDCT identified 47, Lipiodol CT detected 27 (X2= 11.3, P= 0.005<0.01, HAP-MDCT vs Lipiodol CT) and DSA detected 16(X2= 9.09, P= 0.005<0.01 vs Lipiodol CT and X2= 29.03,P = 0.005<0.01 vs HAP-MDCT). However, six nodules <10 mm in diameter were detected only by Lipiodol CT.CONCLUSION: MDCT and Lipiodol CT are two complementary modalities. At present, MDCT does not obviate the need for DSA and subsequent Lipiodol CT as a preoperative examination for HCC.

  19. Iodized oil uptake assessment with cone-beam CT in chemoembolization of small hepatocellular carcinomas

    Institute of Scientific and Technical Information of China (English)

    Ung Bae Jeon; Jun Woo Lee; Ki Seok Choo; Chang Won Kim; Suk Kim; Tae Hong Lee; Yeon Joo Jeong; Dae Hwan Kang

    2009-01-01

    AIM: To evaluate the utility of assessing iodized oil uptake with cone-beam computed tomography (CT) in transarterial chemoembolization (TACE) for small hepatocellular carcinoma (HCC). METHODS: Cone-beam CT provided by a biplane flatpanel detector angiography suite was performed on eighteen patients (sixteen men and two women; 41-76 years; mean age, 58.9 years) directly after TACE for small HCC (26 nodules under 30 mm; mean diameter, 11.9 mm; range, 5-28 mm). The pre-procedural locations of the tumors were evaluated using triphasic multi-detector row helical computed tomography (MDCT). The tumor locations on MDCT and the iodized oil uptake by the tumors were analyzed on cone-beam CT and on spot image directly after the procedures. RESULTS: All lesions on preprocedural MDCT were detected using iodized oil uptake in the lesions on conebeam CT (sensitivity 100%, 26/26). Spot image depicted iodized oil uptake in 22 of the lesions (sensitivity 85%). The degree of iodized oil uptake was overestimated (9%, 2/22) or underestimated (14%, 3/22) on spot image in five nodules compared with that of cone-beam CT. CONCLUSION: Cone-beam CT is a useful and convenient tool for assessing the iodized oil uptake of small hepatic tumors (< 3 cm) directly after TACE.

  20. 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.

  1. Multi slice CT MPR technology and MR of cruciate ligament Comparison of damage diagnosis%多排CT的MPR技术与MR对交叉韧带损伤影诊断的对比

    Institute of Scientific and Technical Information of China (English)

    胡瑞峰; 王琨; 王姝君

    2015-01-01

    Knee ligament damage is very common clinical, MRI is the knee ligament damage check ideal check method, but MRI equipment expensive, a lot of basic-level hospital has not been popular, and MR imaging is the signal imaging, video con-tinuity and 3 d stereoscopic feeling bad, if have metallic implants, are not for MR check, and will influence the MSCT small. At present, multidetector-row CT increasing popularity, multidetector-row CT MPR reconstruction technique in the whole body each system widely used, and the MSCT can also found joint concurrent damage inside and outside, the scanning bilateral knee, in addition, without changes to limb natural postures, reduce pain patients. Will the knee ligament damage is concerned, the do-mestic rarely reported in the literature, through the multidetector-row CT (MSCT) image reconstruction and MPR technology for knee ligament damage across the image diagnosis and an MRI results of the comparison of the science, with the diagnosis rate 97%, and multidetector-row CT of the MPR reconstruction technique for knee ligament damage the diagnostic value of more than MR examination has authenticity, scientific and practical, has the extensive use of the value and popularize value.%膝关节韧带损伤临床上很常见,MRI是目前膝关节韧带损伤检查较理想的检查方法,但MRI设备昂贵,很多基层医院尚未普及,据不完全统计本市的MRI占20%,而且MR影像是信号成像,影像连续性及三维立体感差,如有金属内置物,则不能进行MR检查,而MSCT则影响较小。目前,多排螺旋CT日益普及,多排螺旋CT的MPR重建技术在全身各个系统广泛应用,且MSCT可同时发现关节内外的并发损伤,可同时扫描双侧膝关节,另外,不需改动患肢自然体位,减少患者痛苦。就膝关节韧带损伤而言,国内文献报道很少,通过多排螺旋CT (MSCT)影像三维重建及MPR技术对膝关节交叉韧带损伤的影像诊断与MRI

  2. The in vivo relationship between cross-sectional area and CT dose index in abdominal multidetector CT with automatic exposure control

    Energy Technology Data Exchange (ETDEWEB)

    Meeson, S; Alvey, C M; Golding, S J, E-mail: stuart.meeson@nds.ox.ac.u [Radiology Group, Nuffield Department of Surgery, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU (United Kingdom)

    2010-06-15

    The relationship between patient cross-sectional area and both volume CT dose index (CTDI) and dose length product was explored for abdominal CT in vivo, using a 16 multidetector row CT (MDCT) scanner with automatic exposure control. During a year-long retrospective survey of patients with MDCT for symptoms of abdominal sepsis, cross-sectional areas were estimated using customised ellipses at the level of the middle of vertebra L3. The relationship between cross-sectional area and the exposure parameters was explored. Scans were performed using a LightSpeed 16 (GE Healthcare Medical Systems, Milwaukee, WI) operated with tube current modulation. From a survey of 94 patients it was found that the CTDI increased with the increase in patient cross-sectional area. The relationship was logarithmic rather than linear, with a least-squares fit to the data (R{sup 2} = 0.80). For abdominal CT the cross-sectional area gave a measure of patient size based on the region of the body to be exposed. Exposure parameters increased with increasing cross-sectional area and the greater radiation exposure of larger patients was partly a consequence of their size. Given increasing obesity levels we believe that cross-sectional area and scan length should be added to future dose surveys, allowing patient size to be considered as a factor of relevance when examining population doses.

  3. CT analysis of peripheral airway and lung lesions of patients with asthma and COPD

    Energy Technology Data Exchange (ETDEWEB)

    Itoh, Takayuki; Tanaka, Hiroshi; Sahara, Shin; Ohnishi, Tetsuro; Abe, Shosaku [Sapporo Medical Univ. (Japan). School of Medicine; Koba, Hiroyuki [Teinekeijinkai Hospital, Sapporo (Japan); Ueno, Kan [Hitachi Medico Technology Corp., Tokyo (Japan)

    2002-12-01

    We compared peripheral airway and lung parenchyma images among patients with asthma, chronic obstructive pulmonary disease (COPD) and healthy controls using high-resolution CT images taken by a multidetector-row CT scanner (Aquillion, Toshiba, Japan). CT images were saved as digital image and communication (DICOM) files and %low attenuation area (LAA) (<-960 Hounsfield Unit) was calculated with the imaging software. %LAA was significantly increased in patients with COPD (p<0.0001) and smokers with stable asthma (p<0.01) as compared with healthy controls. In stable asthma, mucous plugging in the airway sometime appeared, while during asthma exacerbation small nodules and mosaic pattern of peripheral lung field appeared. Since smoker's patients with asthma have hyper-secretion of sputum due to smoking, mucous plugging and airway inflammation may easily occur and consequently air trapping may increase. In the future, image diagnosis of peripheral airway should develop for early detection of airway diseases as a non-invasive examination. On the other hand, micro focus X-ray computed tomography system (Hitachi Medico Technology Co., Japan) can display CT images closely similar to the pictures of microscopic findings and it will be a useful tool to analyze radiologic-pathologic correlations of peripheral airways and lung parenchyma. (author)

  4. CT analysis of peripheral airway and lung lesions of patients with asthma and COPD

    International Nuclear Information System (INIS)

    We compared peripheral airway and lung parenchyma images among patients with asthma, chronic obstructive pulmonary disease (COPD) and healthy controls using high-resolution CT images taken by a multidetector-row CT scanner (Aquillion, Toshiba, Japan). CT images were saved as digital image and communication (DICOM) files and %low attenuation area (LAA) (<-960 Hounsfield Unit) was calculated with the imaging software. %LAA was significantly increased in patients with COPD (p<0.0001) and smokers with stable asthma (p<0.01) as compared with healthy controls. In stable asthma, mucous plugging in the airway sometime appeared, while during asthma exacerbation small nodules and mosaic pattern of peripheral lung field appeared. Since smoker's patients with asthma have hyper-secretion of sputum due to smoking, mucous plugging and airway inflammation may easily occur and consequently air trapping may increase. In the future, image diagnosis of peripheral airway should develop for early detection of airway diseases as a non-invasive examination. On the other hand, micro focus X-ray computed tomography system (Hitachi Medico Technology Co., Japan) can display CT images closely similar to the pictures of microscopic findings and it will be a useful tool to analyze radiologic-pathologic correlations of peripheral airways and lung parenchyma. (author)

  5. Three-dimensional CT laryngography: clinical application

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Yong; Kim, Jong Gi; Kim, Hak Jin; Lee, Suck Hong; Wang, Soo Guen [College of Medicine, Pusan National Univ., Pusan (Korea, Republic of)

    2003-10-01

    To evaluate the clinical usefulness of 3D volume-rendering (VR) CT laryngography during quiet breathing, Valsalva, and modified Valsalva maneuvers, in those with laryngeal and pyriform sinus lesions. Twenty-seven patients with various laryngeal and hypopharyngeal lesions were examined by means of four-channel multidetector-row helical CT (LightSpeed QX/i; GE Medical Systems, Milwaukee, Wis., U.S.A.) during quiet breathing, Valsalva, and modified Valsalva maneuvers. The protocol included 1.25-mm slice thickness, 3.75-mm rotation, 1.25 mm interval, and a pitch ratio of 3:1. Using an Advantage Windows 3.1 workstation (GE Medical Systems), 3D VR was generated in regions of interest, including all structures with a CT attenuation of between-1022 and -125 HU. Visual assessment of the findings of 3D CT laryngography, including the images obtained during the three different breathing maneuvers, were analyzed by three radiologists, who reached a consensus. These results were then compared with the findings of axial CT. The lesions discovered, in descending order of frequency, included laryngeal cancer (n=12), pyriform sinus cancer with an intact apex (n=6), pyriform sinus cancer with apex involvement (n=6), laryngeal papilloma (n=2), and hypopharyngeal obstruction with (n=1) and without (n=2) associated vocal cord palsy. In each case, the findings were confirmed by surgical biopsy, direct laryngoscopy, or CT. 3D CT laryngography using the VR technique can supplement the information provided by axial images, and in the assessment of subglottic invasion and pyriform sinus apical invasion, its findings are consistent. In many of our cases, its use during quiet breathing was able to determine whether or not glottic cancer involved subglottic invasion. In laryngeal cancer cases, furthormore, modified Valasalva can be used to clarify the condition of the pyriform sinus apex. Dynamic-phase 3D CT laryngography can be used to elucidate the condition of a patient with vocal cord

  6. 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

  7. CT virtual endoscopy and 3D stereoscopic visualisation in the evaluation of coronary stenting.

    Science.gov (United States)

    Sun, Z; Lawrence-Brown

    2009-10-01

    The aim of this case report is to present the additional value provided by CT virtual endoscopy and 3D stereoscopic visualisation when compared with 2D visualisations in the assessment of coronary stenting. A 64-year old patient was treated with left coronary stenting 8 years ago and recently followed up with multidetector row CT angiography. An in-stent restenosis of the left coronary artery was suspected based on 2D axial and multiplanar reformatted images. 3D virtual endoscopy was generated to demonstrate the smooth intraluminal surface of coronary artery wall, and there was no evidence of restenosis or intraluminal irregularity. Virtual fly-through of the coronary artery was produced to examine the entire length of the coronary artery with the aim of demonstrating the intraluminal changes following placement of the coronary stent. In addition, stereoscopic views were generated to show the relationship between coronary artery branches and the coronary stent. In comparison with traditional 2D visualisations, virtual endoscopy was useful for assessment of the intraluminal appearance of the coronary artery wall following coronary stent implantation, while stereoscopic visualisation improved observers' understanding of the complex cardiac structures. Thus, both methods could be used as a complementary tool in cardiac imaging.

  8. [Application of computed tomography (CT) examination for forensic medicine].

    Science.gov (United States)

    Urbanik, Andrzej; Chrzan, Robert

    2013-01-01

    The aim of the study is to present a own experiences in usage of post mortem CT examination for forensic medicine. With the help of 16-slice CT scanner 181 corpses were examined. Obtained during acquisition imaging data are later developed with dedicated programmes. Analyzed images were extracted from axial sections, multiplanar reconstructions as well as 3D reconstructions. Gained information helped greatly when classical autopsy was performed by making it more accurate. A CT scan images recorded digitally enable to evaluate corpses at any time, despite processes of putrefaction or cremation. If possible CT examination should precede classical autopsy.

  9. 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.)

  10. Hepatocellular carcinoma treated with transarterial chemoembolization: Dynamic perfusion-CT in the assessment of residual tumor

    Institute of Scientific and Technical Information of China (English)

    Davide; Ippolito; Pietro; Andrea; Bonaff; ini; Laura; Ratti; Laura; Antolini; Rocco; Corso; Ferruccio; Fazio; Sandro; Sironi

    2010-01-01

    AIM: To asses the value of computed tomography (CT)-perfusion in the detection of residual hepatocellular carcinoma (HCC) vascularization after transarterial chemoembolization (TACE). METHODS: Thirty-two consecutive patients were pro-spectively included in this study. All patients had liver cirrhosis and a conf irmed HCC lesion which was treated with TACE. One month after treatment, perfusion measurements of treated lesions were carried out. The CTperfusion (CT-p) protocol was performed with 16 slice multid...

  11. Foot CT perfusion in patients with peripheral arterial occlusive disease (PAOD): A feasibility study

    Energy Technology Data Exchange (ETDEWEB)

    Iezzi, R., E-mail: roberto.iezzi@rm.unicatt.it [Department of Bioimaging and Radiological Sciences, Institute of Radiology, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Santoro, M., E-mail: dott.santoromarco@gmail.com [Department of Bioimaging and Radiological Sciences, Institute of Radiology, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Dattesi, R., E-mail: robertadattesi@gmail.com [Department of Bioimaging and Radiological Sciences, Institute of Radiology, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); La Torre, M.F. [Department of Bioimaging and Radiological Sciences, Institute of Radiology, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Tinelli, G., E-mail: tinelli@rm.unicatt.it [Department of Vascular Surgery, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Snider, F., E-mail: fsnider@rm.unicatt.it [Department of Vascular Surgery, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy); Bonomo, L., E-mail: lbonomo@rm.unicatt.it [Department of Bioimaging and Radiological Sciences, Institute of Radiology, “A. Gemelli” Hospital – Catholic University, L.go A Gemelli 8, 00168 Rome (Italy)

    2013-09-15

    Purpose: To prospectively assess the technical feasibility and reproducibility of quantitative foot perfusion multidetector-row computed tomography (MDCT) in patients with peripheral occlusive artery disease (PAOD) and to evaluate perfusion parameters changes after endovascular treatment. Materials and methods: Institutional review board approval and informed patient consent were obtained. 10 patients older than 65 years (mean 74.1 years, range 66–95 years) with PAOD and who were referred to our department for single-limb endovascular treatment were enrolled prospectively. All patients underwent foot CT perfusion examinations before and within 72 h after endovascular treatment. A 64-row CT lightspeed VCT scanner (GE Medical Systems) was used with acquisition of eight contiguous 5-mm reconstructed sections (60-s acquisition time; 40 mL Iomeprol 400 mgI/mL, @4 mL/s). Data were analyzed by two blinded readers using commercially available software to calculate perfusion parameters. Inter-observer and intra-observer agreement of perfusion CT analysis was assessed using Bland–Altman analyses and intra-class correlation coefficient (ICC). Changes in perfusion parameters after endovascular treatment were assessed using Wilcoxon's test. Results: Good inter-observer and intra-observer agreement was obtained in all patients. Good agreement was obtained for perfusion parameters for the untreated foot and in repeated studies. By comparing perfusion parameters in the treated foot, a significantly shorter mean transit time (MTT) was obtained. Conclusions: Foot CT perfusion is a feasible and reproducible technique. A significant decrease of MTT between pre- and post-revascularization suggests improved flow in the below-the-knee arteries.

  12. Foot CT perfusion in patients with peripheral arterial occlusive disease (PAOD): A feasibility study

    International Nuclear Information System (INIS)

    Purpose: To prospectively assess the technical feasibility and reproducibility of quantitative foot perfusion multidetector-row computed tomography (MDCT) in patients with peripheral occlusive artery disease (PAOD) and to evaluate perfusion parameters changes after endovascular treatment. Materials and methods: Institutional review board approval and informed patient consent were obtained. 10 patients older than 65 years (mean 74.1 years, range 66–95 years) with PAOD and who were referred to our department for single-limb endovascular treatment were enrolled prospectively. All patients underwent foot CT perfusion examinations before and within 72 h after endovascular treatment. A 64-row CT lightspeed VCT scanner (GE Medical Systems) was used with acquisition of eight contiguous 5-mm reconstructed sections (60-s acquisition time; 40 mL Iomeprol 400 mgI/mL, @4 mL/s). Data were analyzed by two blinded readers using commercially available software to calculate perfusion parameters. Inter-observer and intra-observer agreement of perfusion CT analysis was assessed using Bland–Altman analyses and intra-class correlation coefficient (ICC). Changes in perfusion parameters after endovascular treatment were assessed using Wilcoxon's test. Results: Good inter-observer and intra-observer agreement was obtained in all patients. Good agreement was obtained for perfusion parameters for the untreated foot and in repeated studies. By comparing perfusion parameters in the treated foot, a significantly shorter mean transit time (MTT) was obtained. Conclusions: Foot CT perfusion is a feasible and reproducible technique. A significant decrease of MTT between pre- and post-revascularization suggests improved flow in the below-the-knee arteries

  13. 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...

  14. 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.

  15. Multidetector CT radiation dose optimisation in adults: short- and long-term effects of a clinical audit

    International Nuclear Information System (INIS)

    To report short- and long-term effects of an audit process intended to optimise the radiation dose from multidetector row computed tomography (MDCT). A survey of radiation dose from all eight MDCT departments in the state of Luxembourg performed in 2007 served as baseline, and involved the most frequently imaged regions (head, sinus, cervical spine, thorax, abdomen, and lumbar spine). CT dose index volume (CTDIvol), dose-length product per acquisition (DLP/acq), and DLP per examination (DLP/exa) were recorded, and their mean, median, 25th and 75th percentiles compared. In 2008, an audit conducted in each department helped to optimise doses. In 2009 and 2010, two further surveys evaluated the audit's impact on the dose delivered. Between 2007 and 2009, DLP/exa significantly decreased by 32-69 % for all regions (P < 0.001) except the lumbar spine (5 %, P = 0.455). Between 2009 and 2010, DLP/exa significantly decreased by 13-18 % for sinus, cervical and lumbar spine (P ranging from 0.016 to less than 0.001). Between 2007 and 2010, DLP/exa significantly decreased for all regions (18-75 %, P < 0.001). Collective dose decreased by 30 % and the 75th percentile (diagnostic reference level, DRL) by 20-78 %. The audit process resulted in long-lasting dose reduction, with DRLs reduced by 20-78 %, mean DLP/examination by 18-75 %, and collective dose by 30 %. (orig.)

  16. Multidetector CT radiation dose optimisation in adults: short- and long-term effects of a clinical audit

    Energy Technology Data Exchange (ETDEWEB)

    Tack, Denis [EpiCURA Hospital, Clinique Louis Caty, Department of Radiology, Baudour (Belgium); Jahnen, Andreas; Kohler, Sarah [CRP Henri Tudor, Luxembourg (Luxembourg); Harpes, Nico; Back, Carlo [Ministry of Health, Department of Radiation Protection, Luxembourg (Luxembourg); Maertelaer, Viviane de [Universite libre de Bruxelles, Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire and SBIM, Statistical Unit, Brussels (Belgium); Gevenois, Pierre Alain [Hopital Erasme, Department of Radiology, Brussels (Belgium)

    2014-01-15

    To report short- and long-term effects of an audit process intended to optimise the radiation dose from multidetector row computed tomography (MDCT). A survey of radiation dose from all eight MDCT departments in the state of Luxembourg performed in 2007 served as baseline, and involved the most frequently imaged regions (head, sinus, cervical spine, thorax, abdomen, and lumbar spine). CT dose index volume (CTDIvol), dose-length product per acquisition (DLP/acq), and DLP per examination (DLP/exa) were recorded, and their mean, median, 25th and 75th percentiles compared. In 2008, an audit conducted in each department helped to optimise doses. In 2009 and 2010, two further surveys evaluated the audit's impact on the dose delivered. Between 2007 and 2009, DLP/exa significantly decreased by 32-69 % for all regions (P < 0.001) except the lumbar spine (5 %, P = 0.455). Between 2009 and 2010, DLP/exa significantly decreased by 13-18 % for sinus, cervical and lumbar spine (P ranging from 0.016 to less than 0.001). Between 2007 and 2010, DLP/exa significantly decreased for all regions (18-75 %, P < 0.001). Collective dose decreased by 30 % and the 75th percentile (diagnostic reference level, DRL) by 20-78 %. The audit process resulted in long-lasting dose reduction, with DRLs reduced by 20-78 %, mean DLP/examination by 18-75 %, and collective dose by 30 %. (orig.)

  17. Preoperative assessment of vascular anatomy of inferior mesenteric artery by volume-rendered 3D-CT for laparoscopic lymph node dissection with left colic artery preservation in lower sigmoid and rectal cancer

    Institute of Scientific and Technical Information of China (English)

    Michiya Kobayashi; Satoshi Morishita; Takehiro Okabayashi; Kana Miyatake; Ken Okamoto; Tsutomu Namikawa; Yasuhiro Ogawa; Keijiro Araki

    2006-01-01

    AIM: To determine the distance between the branching point of the left colic artery (LCA) and the inferior mesenteric artery (IMA) by computed tomography (CT) scanning, for preoperative evaluation before laparoscopic colorectal operation.METHODS: From February 2004 to May 2005, 100patients (63 men, 37 women) underwent angiography performed with a 16-scanner multi-detector row CT unit (Toshiba, Aquilion 16). All images were analyzed on a workstation (AZE Ltd, Virtual Place Advance 300). The distance from the root of the IMA to the bifurcation of the LCA was measured by curved multi-planar reconstruction on a workstation.RESULTS: The IMA could be visualized in all the cases,but the LCA was missing in two patients. The mean distance from the root of the IMA to the root of the LCA was 42.0 mm (range, 23.2-75.0 mm). There were no differences in gender, arterial branching types, body weight, height, and body mass index.CONCLUSION: Volume-rendered 3D-CT is helpful to assess the vascular branching anatomy for laparoscopic surgery.

  18. Radiation dose optimization in CT planning of corrective scoliosis surgery. A phantom study.

    OpenAIRE

    Abul-Kasim, Kasim; Gunnarsson, Mikael; Maly, Pavel; Ohlin, Acke; Sundgren, Pia

    2008-01-01

    The aim of the study was to explore the possibility of obtaining a helical CT scan of a long segment of vertebral column, optimally reduce the radiation dose, compare the radiation dose of the low dose helical CT with that of some of the CT protocols used in clinical practice and finally assess the impact of such a dose reduction on the image quality. A chest phantom was examined with a 16-slice CT scanner. Six scans were performed with different radiation doses. The lowest radiation dose whi...

  19. Malignant solitary pulmonary nodules:size and attenuation measured on a PACS and CT workstation

    Institute of Scientific and Technical Information of China (English)

    Shenjiang Li; Liguang Zheng; Cui Li; Guangwen Jv; Wenjie Liang; Changcheng Li; Debin Liu; Feng Zhu; Yan Zhu; Xuefeng Cui

    2014-01-01

    Objective: The aim of our study was to determine the ef iciency and ef ectiveness of picture archiving and com-munication system (PACS) workstation in detecting the sizes and attenuation of malignant solitary pulmonary nodules (SPNs). Methods: Forty patients with malignant SPNs (diameter ≤ 3 cm) underwent multidetector-row computed tomography (CT) of the chest in a single-breath-hold technique. The raw data were acquired with a col imation of 0.625 mm. The diameters and attenuation of malignant SPNs were measured on PACS and CT workstation respectively. The diameter was defined as the average value of the anteroposterior, lateral and superoinferior diameters on CT scans obtained with a mediastinal window setting. The superoinferior diameters were measured on MPR image. The diameters and attenuation of malignant SPNs and spending time in measuring were recorded. Results: The diameters of malignant SPNs measured on a PACS and CT workstation were 2.09 cm ± 0.87 cm, 2.07 cm ± 0.79 cm, respectively. There was not statistical y significant dif erence in the diameters of malignant SPNs between that measured on a PACS workstation and that on a CT workstation (t = 1.580, P =0.210 > 0.05). The attenuation of malignant SPNs measured on a PACS and CT workstation were 40.15 HU ± 7.53 HU, 39.99 HU ± 8.13 HU, respectively. There was not statistical y significant dif erence in the attenuation of malignant SPNs between that measured on a PACS workstation and that on a CT workstation (t = 1.008, P = 0.298 > 0.05). The spending time in mea-suring on a PACS and CT workstation were 55 s ± 4.03 s, 56 s ± 3.95 s, respectively. No statistical y significant dif erence was found in spending time in measuring between that on a PACS workstation and that on a CT workstation (t = 0.958, P =0.315 > 0.05). Conclusion: The ef iciency and ef ectiveness of PACS workstation is as same as those of CT workstation in detecting the sizes and attenuation of malignant SPNs. It is suggested that the

  20. Effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies

    Science.gov (United States)

    Murase, Kenya; Nanjo, Takafumi; Satoshi, Ii; Miyazaki, Shohei; Hirata, Masaaki; Sugawara, Yoshifumi; Kudo, Masayuki; Sasaki, Kousuke; Mochizuki, Teruhito

    2005-11-01

    The purpose of this study was to investigate the effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies using multi-detector row CT (MDCT). Following the standard CT perfusion study protocol, continuous (cine) scans (1 s/rotation × 60 s) consisting of four 5 mm thick contiguous slices were performed using an MDCT scanner with a tube voltage of 80 kVp and a tube current of 200 mA. We generated the simulated images with tube currents of 50 mA, 100 mA and 150 mA by adding the corresponding noise to the raw scan data of the original image acquired above using a noise simulation tool. From the original and simulated images, we generated the functional images of cerebral blood flow (CBF), cerebral blood volume (CBV) and mean transit time (MTT) in seven patients with cerebrovascular disease, and compared the correlation coefficients (CCs) between the perfusion parameter values obtained from the original and simulated images. The coefficients of variation (CVs) in the white matter were also compared. The CC values deteriorated with decreasing tube current. There was a significant difference between 50 mA and 100 mA for all perfusion parameters. The CV values increased with decreasing tube current. There were significant differences between 50 mA and 100 mA and between 100 mA and 150 mA for CBF. For CBV and MTT, there was also a significant difference between 150 mA and 200 mA. This study will be useful for understanding the effect of x-ray tube current on the accuracy of cerebral perfusion parameters obtained by CT perfusion studies using MDCT, and for selecting the tube current.

  1. Perfusion CT in Colorectal Cancer: Comparison of Perfusion Parameters with Tumor Grade and Microvessel Density

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jin Woong; Jeong, Yong Yeon; Chang, Nam Kyu; Heo, Suk Hee; Hur, Young Hoe; Kang, Heoung Keun [Chonnam National University Hwasun Hospital, Hwasun(Korea, Republic of); Shin, Sang Soo; Lee, Jae Hyuk [Chonnam National University Hospital, Gwangju (Korea, Republic of)

    2012-02-15

    The purpose of this study was to prospectively compare pre-operative computed tomography (CT) perfusion parameters with tumor grade from colorectal adenocarcinoma (CRC) and to correlate pre-operative CT perfusion parameters with microvessel density (MVD) to evaluate angiogenesis in CRC. Pre-operative perfusion CTs were performed with a 64-channel multidetector row CT in 27 patients (17 women and 10 men; age range 32-82 years) who were diagnosed with CRC involving the sigmoid and rectum between August 2006 and November 2007. All patients underwent surgery without pre-operative chemotherapy or radiation therapy. Dynamic perfusion CTs were performed for 65 seconds after intravenous injection of contrast medium (100 mL, 300 mg of iodine per mL, 5 mL/sec). Before surgery, blood flow (BF), blood volume, mean transit time (MTT), and permeability-surface area product were measured in the tumor. After surgery, one gastrointestinal pathologist evaluated tumor grade and performed immunohistochemical staining using CD 34 to determine MVD in each tumor. The Kruskal-Wallis test was used to compare CT perfusion parameters with tumor grade, and Pearson's correlation analysis was used to correlate CT perfusion parameters with MVD. In 27 patients with CRC, tumor grading was as follows: well differentiated (n = 8); moderately differentiated (n = 15); and poorly differentiated (n = 4). BF was higher in moderately differentiated CRC than well differentiated and poorly differentiated CRCs (p = 0.14). MTT was shorter in moderately differentiated than well differentiated and poorly differentiated CRCs (p = 0.039). The MVD was greater in poorly differentiated than well differentiated and moderately differentiated CRCs (p = 0.034). There was no significant correlation between other perfusion parameters and tumor grade. There was no significant correlation between CT perfusion parameters and MVD. BF and MTT measurement by perfusion CT is effective in predicting moderately differentiated CRCs

  2. CT two-dimensional reformation versus three-dimensional volume rendering with regard to surgical findings in the preoperative assessment of the ossicular chain in chronic suppurative otitis media

    Energy Technology Data Exchange (ETDEWEB)

    Guo, Yong, E-mail: guoyong27@hotmail.com [Department of Radiology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China); Liu, Yang, E-mail: liuyangdoc@sina.com [Department of Otorhinolaryngology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China); Lu, Qiao-hui, E-mail: Luqiaohui465@126.com [Department of Radiology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China); Zheng, Kui-hong, E-mail: zhengkuihong1971@sina.com [Department of Radiology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China); Shi, Li-jing, E-mail: Shilijing2003@yahoo.com.cn [Department of Radiology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China); Wang, Qing-jun, E-mail: wangqingjun77@163.com [Department of Radiology, Navy General Hospital, 6# Fucheng Road, Beijing 100048 (China)

    2013-09-15

    Purpose: To assess the role of three-dimensional volume rendering (3DVR) in the preoperative assessment of the ossicular chain in chronic suppurative otitis media (CSOM). Materials and methods: Sixty-six patients with CSOM were included in this prospective study. Temporal bone was scanned with a 128-channel multidetector row CT and the axial data was transferred to the workstation for multiplanar reformation (MPR) and 3DVR reconstructions. Evaluation of the ossicular chain according to a three-point scoring system on two-dimensional reformation (2D) and 3DVR was performed independently by two radiologists. The evaluation results were compared with surgical findings. Results: 2D showed over 89% accuracy in the assessment of segmental absence of the ossicular chain in CSOM, no matter how small the segmental size was. 3DVR was as accurate as 2D for the assessment of segmental absence. However, 3DVR was found to be more accurate than 2D in the evaluation of partial erosion of segments. Conclusion: Both 3DVR and 2D are accurate and reliable for the assessment of the ossicular chain in CSOM. The inclusion of 3DVR images in the imaging protocol improves the accuracy of 2D in detecting ossicular erosion from CSOM.

  3. New insights on COPD imaging via CT and MRI

    OpenAIRE

    Sverzellati, N; Molinari, F.; PIRRONTI, T.; Bonomo, L.; Spagnolo, P.; Zompatori, M.

    2007-01-01

    Multidetector-row computed tomography (MDCT) can be used to quantify morphological features and investigate structure/function relationship in COPD. This approach allows a phenotypical definition of COPD patients, and might improve our understanding of disease pathogenesis and suggest new therapeutical options. In recent years, magnetic resonance imaging (MRI) has also become potentially suitable for the assessment of ventilation, perfusion and respiratory mechanics. This review focuses on th...

  4. Assessment of the anterior spinal artery and the artery of Adamkiewicz using multi-detector CT angiography

    Institute of Scientific and Technical Information of China (English)

    ZHAO Shao-hong; Laura Logan; Pamela Schraedley; Geoffrey D. Rubin

    2009-01-01

    Background Damage to the spinal cord after the treatment of the descending thoracic and thoracoabdominal aortic aneurysms is an uncommon but devastating complication. The artery of Adamkiewicz (AKA) is the principal arterial supply of the anterior spinal artery (ASA) in the lower thoracic and lumbar level. The purpose of this study was to evaluate the visualization of the anterior spinal artery and the artery of Adamkiewicz, the affecting factors for the detection rate using multi-detector row CT (MDCT). Methods Ninety-nine consecutive patients (31 women and 68 men; age range, 25-90 years; average age 61.3 years), with suspicion for thoracic aortic lesions necessitating surgical intervention (31 aortic aneurysm, 45 dissection, 5 intramural hematoma, and 18 normal), underwent CT angiography from the aortic arch to the aortic bifurcation. Transverse sections, multiplanar reformations and thin maximum intensity projections were used to assess the ASA and AKA. The level of the ASA and AKA origins and CT acquisition parameters were recorded. The contrast-to-noise ratio of the image, an index of the mass of the T11 body (vertebral mass index), the subcutaneous fat thickness, and the CT value within the aortic arch and at the T11 level were measured. The detection of the ASA and AKA were evaluated relative to the acquisition parameters, scan characteristics, and aortic lesion type. Differences were assessed with the Wilcoxon rank-sum and t tests. Results The ASA was visualized in 51 patients (52%) and the AKA in 18 patients (18%). The ASA was identified in 36/67 patients (54%) with 1.25 mm thickness and in 15/32 patients (47%) with 2.5-3.0 mm thickness. This difference did not achieve significance (P=0.13). The detection rate of the ASA and the AKA was influenced by the vertebral mass index and the contrast-to-noise ratio (P<0.05). The amount of subcutaneous fat affected the detection rate of the ASA (P <0.05) but not the AKA. In CT scans of ASA detection, the mean CT

  5. Computer-aided detection (CAD) of lung nodules in CT scans: radiologist performance and reading time with incremental CAD assistance

    Energy Technology Data Exchange (ETDEWEB)

    Roos, Justus E.; Paik, David; Olsen, David; Liu, Emily G.; Leung, Ann N.; Mindelzun, Robert; Choudhury, Kingshuk R.; Napel, Sandy; Rubin, Geoffrey D. [Stanford University Medical Center, Department of Radiology, Stanford, CA (United States); Chow, Lawrence C. [Oregon Health and Science University, Department of Radiology, Portland, OR (United States); Naidich, David P. [New York University Medical Center, Department of Radiology, New York, NY (United States)

    2010-03-15

    The diagnostic performance of radiologists using incremental CAD assistance for lung nodule detection on CT and their temporal variation in performance during CAD evaluation was assessed. CAD was applied to 20 chest multidetector-row computed tomography (MDCT) scans containing 190 non-calcified {>=}3-mm nodules. After free search, three radiologists independently evaluated a maximum of up to 50 CAD detections/patient. Multiple free-response ROC curves were generated for free search and successive CAD evaluation, by incrementally adding CAD detections one at a time to the radiologists' performance. The sensitivity for free search was 53% (range, 44%-59%) at 1.15 false positives (FP)/patient and increased with CAD to 69% (range, 59-82%) at 1.45 FP/patient. CAD evaluation initially resulted in a sharp rise in sensitivity of 14% with a minimal increase in FP over a time period of 100 s, followed by flattening of the sensitivity increase to only 2%. This transition resulted from a greater prevalence of true positive (TP) versus FP detections at early CAD evaluation and not by a temporal change in readers' performance. The time spent for TP (9.5 s {+-} 4.5 s) and false negative (FN) (8.4 s {+-} 6.7 s) detections was similar; FP decisions took two- to three-times longer (14.4 s {+-} 8.7 s) than true negative (TN) decisions (4.7 s {+-} 1.3 s). When CAD output is ordered by CAD score, an initial period of rapid performance improvement slows significantly over time because of non-uniformity in the distribution of TP CAD output and not to a changing reader performance over time. (orig.)

  6. Comparing three-dimensional volume-rendered CT images with fibreoptic tracheobronchoscopy in the evaluation of airway compression caused by tuberculous lymphadenopathy in children

    Energy Technology Data Exchange (ETDEWEB)

    Plessis, Jaco du; George, Reena [University of Stellenbosch, Department of Radiology, Tygerberg (South Africa); Goussard, Pierre; Gie, Robert [Tygerberg Children' s Hospital, Department of Paediatrics, Cape Town (South Africa); Andronikou, Savvas [University of Cape Town, Department of Radiology, Cape Town (South Africa)

    2009-07-15

    Lymphobronchial tuberculosis (TB) causes airway compression in 38% of patients. The airway obstruction is conventionally assessed with fibreoptic tracheobronchoscopy (FTB). Multidetector-row spiral computed tomography (MDCT) with three-dimensional volume rendering (3-D VR) has significantly improved the imaging of the airways. No previous studies have assessed the accuracy of 3-D VR in determining the degree of airway compression in children due to TB lymphadenopathy. To compare 3-D VR CT to FTB for the assessment of airway compression due to TB lymphadenopathy in children. Included in the study were 26 children presenting with symptoms of airway compression caused by pulmonary TB. MDCT of the chest and FTB were performed in all patients. Retrospective 3-D VR reconstruction of the major airways was performed from the original CT raw data and used to evaluate the tracheobronchial tree for site and degree of airway compression and then compared to the FTB findings. FTB was used as the reference standard By FTB 87 sites of airway compression were identified. Using the 3-D VR technique, 138 sites of airway compression were identified, of which 78 (90%) matched with the sites identified by FTB. The sensitivity and specificity of 3-D VR when compared with that of FTB was 92% and 85%, respectively. In four patients (15%), severe narrowing of the bronchus intermedius made FTB evaluation of the right middle and right lower lobe bronchi impossible. VR demonstrated significant distal obstruction in three of these four patients 3-D VR demonstrates a very good correlation with FTB in determining airway compression caused by TB lymphadenopathy in children. In combination with FTB, 3-D VR adds confidence to the bronchoscopy findings and complements FTB by adding additional information on the status of the airway distal to severe obstructions unreachable by FTB. (orig.)

  7. Comparing SUV values of images at PET-CT console and the RT planning console using identical dataset of a study phantom

    OpenAIRE

    Anusheel Munshi; Sayan Paul; Biplab Sarkar; Pinkey Bala; Tharmar Ganesh; Ishita B Sen; Vineet Pant; Bidhu K Mohanti

    2016-01-01

    Purpose: The use of positron emission tomography (PET) for radiotherapy planning purposes has become increasingly important in the last few years.In the current study, we compared the SUV values of images at the PET CT console to the SUV values obtained at the RT planning workstation. Materials and Methods: The PET-CT cylindrical body phantom was filled with a uniform 18F solution of 5.3. ± 0.27 kBq/mL radioactivity concentration. PET-CT scans were performed on a16 slice Time of Flight sys...

  8. 16层CTA与DSA诊断颅内动脉瘤效能的对比研究%Values of 16-slice CTA and DSA in diagnosis of intracranial aneurysm

    Institute of Scientific and Technical Information of China (English)

    王建涛; 左峰; 王硕

    2011-01-01

    Objective To assess the values of 16-slice CTA and DSA in the diagnosis of intracranial aneurysms. Methods Eighty-two patients with SAH,suspected having aneurysms and admitted to our hospital from July 2007 to July 2008,received DSA and CTA;the clinical data of these patients were analyzed;CTA images were compared blindly with the DSA findings,including the presence,location,and size of aneurysms.With SPSS 11.5 statistical software,the sensitivity,specificity and accuracy of CTA and DSA were compared. Results Eighty-one aneurysms were detected by DSA and 74 aneurysms by CTA;no significant difirences on the positive detected rate were noted(x2=1.897,P=0.163).The sensitivity of CTA for detection of all aneurysms versus that of DSA was 91.4%,the specificity of CTA 91.7%.and the accuracy of CTA 91.4%.Sixty-five patients underwent surgery (clipping)and 73 aneurysms were confirmed by this surgery;CTA had a sensitivity of 89.0%,specificity of 100%and accuracy of 90.5%:DSA had a sensitivity of 98.6%,specificity of 84.6%and accuracy of 98.8%;significant statistical diference on sensitivity (x2=5.625,P0.05)were found between them.As compared with the sizes of aneurysms and the diameters of aneurysm necks measured during the operation,these results detected by CTA were significantly larger(P0.05);与术中测量的瘤体、瘤颈直径比较,CTA检查结果较大,差异有统计学意义(P<0.05);CTA检查对不同部位、大小动脉瘤的灵敏度不同,而DSA检查具有较高敏感性.结论 16层CTA具有无创、快捷、敏感、高效等优点,可做为筛选动脉瘤的方法,部分患者可凭CTA指导手术.

  9. 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

  10. 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

  11. 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.

  12. The optimal slice thickness of CT in revealing lobulation of malignant solitary pulmonary nodules%显示恶性不利肺结节分叶征的正想CT层厚

    Institute of Scientific and Technical Information of China (English)

    Shenjiang Li; Changcheng Li; Xin Wang; Debin Liu; Wenjie Liang; Feng Zhu; Yan Zhu; Xuefeng Cui; Wenjie Bi

    2011-01-01

    Objective: The aim of this study was to determine an optimal slice thickness that was efficient in revealing lobula-tion of malignant solitary pulmonary nodules (SPNs) on multi-slice spiral computed tomography (MSCT) images preliminarily. Methods: Fifty patients with malignant SPNs (diameter ≤ 3 cm) underwent multidetector-row computed tomography of the chest in a single-breath-hold technique. The raw data were acquired with a collimation of 0.625 mm. Three sets of contiguous images were reconstructed with 1-, 2-, and 5-mm slice thickness, respectively. The lobulation sign of SPNs on the computed tomography (CT) images presented in 1-, 2-, and 5-mm slice thickness was compared. Using the 1-mm sections as the gold standard, an optimal slice thickness in revealing lobulation sign of SPNs was determined. Results: The 1-mm-thick images CT revealed 98 lobulations (25 with chord distance 2 mm) of 45 malignant SPNs. 18 lobulations with chord distance 0.05). 13 lobulations with chord distance 1-2 mm presented in 5-mm-thick sections were as same as that in 1-mm-thick sections. There was statistically significant difference in lobulations number between that revealed in 5-mm-thick sections were as same as that in 1-mm-thick sections. No statistically significant difference in lobulations number was found between that revealed in 2-mm-thick images and that in 1-mm-thick images (P = 0.631 > 0.05). 36 lobulations with chord significant difference in lobulations number between that revealed in 5-mm-thick images and that in 1-mm-thick images (P = 0.264 > 0.05). Conclusion: It is suggested that the use of 1-mm slice thickness is suitable in revealing lobulations with chord distance 2 mm.

  13. 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.

  14. SU-E-T-70: Commissioning a Multislice CT Scanner for X-Ray CT Polymer Gel Dosimetry

    International Nuclear Information System (INIS)

    Purpose: To commission a multislice computed tomography (CT) scanner for fast and reliable readout of radiation therapy (RT) dose distributions using CT polymer gel dosimetry (PGD). Methods: Commissioning was performed for a 16-slice CT scanner using images acquired through a 1L cylinder filled with water. Additional images were collected using a single slice machine for comparison purposes. The variability in CT number associated with the anode heel effect was evaluated and used to define a new slice-by-slice background image subtraction technique. Image quality was assessed for the multislice system by comparing image noise and uniformity to that of the single slice machine. The consistency in CT number across slices acquired simultaneously using the multislice detector array was also evaluated. Finally, the variability in CT number due to increasing x-ray tube load was measured for the multislice scanner and compared to the tube load effects observed on the single slice machine. Results: Slice-by-slice background subtraction effectively removes the variability in CT number across images acquired simultaneously using the multislice scanner and is the recommended background subtraction method when using a multislice CT system. Image quality for the multislice machine was found to be comparable to that of the single slice scanner. Further study showed CT number was consistent across image slices acquired simultaneously using the multislice detector array for each detector configuration of the slice thickness examined. In addition, the multislice system was found to eliminate variations in CT number due to increasing x-ray tube load and reduce scanning time by a factor of 4 when compared to imaging a large volume using a single slice scanner. Conclusion: A multislice CT scanner has been commissioning for CT PGD, allowing images of an entire dose distribution to be acquired in a matter of minutes. Funding support provided by the Natural Sciences and Engineering

  15. Cranial CT with 64-, 16-, 4- and single-slice CT systems-comparison of image quality and posterior fossa artifacts in routine brain imaging with standard protocols

    Energy Technology Data Exchange (ETDEWEB)

    Ertl-Wagner, Birgit; Eftimov, Lara; Becker, Christoph; Reiser, Maximilian [University of Munich, Grosshadern (Germany). Institute of Clinical Radiology; Blume, Jeffrey; Cormack, Jean [Brown University, Center for Statistical Sciences, Providence, RI (United States); Bruening, Roland; Brueckmann, Hartmut [University of Munich, Grosshadern (Germany). Department of Neuroradiology

    2008-08-15

    Posterior fossa artifacts constitute a characteristic limitation of cranial CT. To identify practical benefits and drawbacks of newer CT systems with reduced collimation in routine cranial imaging, we aimed to investigate image quality, posterior fossa artifacts and parenchymal delineation in non-enhanced CT (NECT) with 1-, 4-, 16- and 64-slice scanners using standard scan protocols. We prospectively enrolled 25 consecutive patients undergoing NECT on a 64-slice CT. Three groups with 25 patients having undergone NECT on 1-, 4- and 16-slice CT machines were matched regarding age and sex. Standard routine CT parameters were used on each CT system with helical acquisition in the posterior fossa; the parameters varied regarding collimation and radiation dose. Three blinded readers independently assessed the cases regarding image quality, infra- and supratentorial artifacts and delineation of brain parenchymal structures on a five-point ordinal scale. Reading orders were randomized. A proportional odds model that accounted for the correlated nature of the data was fit using generalized estimating equations. Posterior fossa artifacts were significantly reduced, and the delineation of infratentorial brain structures was significantly improved with the thinner collimation used for the newer CT systems (p<0.001). No significant differences were observed for midbrain structures (p>0.5). The thinner collimation available on modern CT systems leads to reduced posterior fossa artifacts and to a better delineation of brain parenchyma in the posterior fossa. (orig.)

  16. Infections of the neck leading to descending necrotizing mediastinitis: Role of multi-detector row computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Pinto, Antonio [Department of Diagnostic Imaging, A. Cardarelli Hospital, 80131 Naples (Italy)], E-mail: antopin1968@libero.it; Scaglione, Mariano; Scuderi, Maria Giuseppina; Tortora, Giovanni; Daniele, Stefania; Romano, Luigia [Department of Diagnostic Imaging, A. Cardarelli Hospital, 80131 Naples (Italy)

    2008-03-15

    Descending necrotizing mediastinitis is an acute, polymicrobial infection of the mediastinum, originating from odontogenic, oropharyngeal and cervical infections. Anatomical continuity of the fascial spaces between the neck and the mediastinum leads to an occasional mediastinal extension of deep neck infection as a serious sequela. An understanding of the anatomy of the deep spaces of the neck and familiarity with the imaging findings in descending necrotizing mediastinitis may allow rapid diagnosis and treatment of this rare and life-threatening complication of deep neck space infection. In this article, we discuss the current role of radiology in diagnosing descending necrotizing mediastinitis, in determining the level of infection and the pathways of spread of infections from the neck to the mediastinum and in planning a successful treatment.

  17. A rigid motion correction method for helical computed tomography (CT)

    International Nuclear Information System (INIS)

    We propose a method to compensate for six degree-of-freedom rigid motion in helical CT of the head. The method is demonstrated in simulations and in helical scans performed on a 16-slice CT scanner. Scans of a Hoffman brain phantom were acquired while an optical motion tracking system recorded the motion of the bed and the phantom. Motion correction was performed by restoring projection consistency using data from the motion tracking system, and reconstructing with an iterative fully 3D algorithm. Motion correction accuracy was evaluated by comparing reconstructed images with a stationary reference scan. We also investigated the effects on accuracy of tracker sampling rate, measurement jitter, interpolation of tracker measurements, and the synchronization of motion data and CT projections. After optimization of these aspects, motion corrected images corresponded remarkably closely to images of the stationary phantom with correlation and similarity coefficients both above 0.9. We performed a simulation study using volunteer head motion and found similarly that our method is capable of compensating effectively for realistic human head movements. To the best of our knowledge, this is the first practical demonstration of generalized rigid motion correction in helical CT. Its clinical value, which we have yet to explore, may be significant. For example it could reduce the necessity for repeat scans and resource-intensive anesthetic and sedation procedures in patient groups prone to motion, such as young children. It is not only applicable to dedicated CT imaging, but also to hybrid PET/CT and SPECT/CT, where it could also ensure an accurate CT image for lesion localization and attenuation correction of the functional image data. (paper)

  18. Evaluation of right ventricular function by 64-row CT in patients with chronic obstructive pulmonary disease and cor pulmonale

    International Nuclear Information System (INIS)

    Purpose: The aim of this study was to investigate the clinical application value of right ventricle (RV) function measured by 64 multi-detector row CT (MDCT) in patients with chronic obstructive pulmonary disease (COPD) and cor pulmonale. Materials and methods: Sixty-three consecutive patients with COPD and cor pulmonale were referred for electrocardiographically gated MDCT for evaluation of suspected or known coronary artery disease. Magnetic resonance imaging (MRI) for cardiac function analysis was performed on the same day. The MDCT and MRI examinations were successfully completed in 58 patients. Forty-six patients with COPD were divided into three groups according to the severity of disease by the pulmonary function test (PFT). Twelve patients diagnosed as cor pulmonale and 32 control subjects were also included. The RV function and myocardial mass (MM) were obtained by 64-MDCT and 1.5 T cardiac MRI in all of the groups. The results were compared among the groups using the Newman–Keuls method. Pearson's correlation was used to evaluate the relationship between the right ventricular ejection fraction (RVEF) and MM with the PFT results in COPD and cor pulmonale patients. Results: The RVEF was significantly lower in patients with severe COPD and cor pulmonale than it was in those patients with mild or moderate COPD (P < 0.01). There were strong correlations between MDCT and MRI (r = 0.826 for RV MM, r = 0.982 and 0.969 for RV EDV and RV ESV, r = 0.899 for RVEF) and between MDCT results and forced expiratory volume in 1 s (r = 0.787 for RVEF, r = −0.774 for RV MM) in all patients. Conclusion: MDCT can accurately quantify RV function and MM. The RVEF and RV MM measured by MDCT correlate well with the severity of disease as determined by PFT in patients with COPD and cor pulmonale. The assessment of right ventricular function is clinically important for evaluation of the severity of COPD, which may provide an objective basis for therapeutic strategy.

  19. Attenuation-based characterization of coronary atherosclerotic plaque: Comparison of dual source and dual energy CT with single-source CT and histopathology

    International Nuclear Information System (INIS)

    Objective: To compare different CT acquisition techniques regarding for attenuation-based characterization of coronary atherosclerotic plaques using histopathology as the standard of reference. Materials and methods: In a post mortem study 17 human hearts were studied with dual-source CT (DSCT) and dual energy CT (DECT) mode on a DSCT as well as with 16-slice single-source CT (SSCT). At autopsy, atherosclerotic lesions were cut at 5 μm sections. Histopathologic classification of the plaques according to the American Heart Association (AHA) criteria was performed by two pathologists. Attenuation values of all plaques were measured in DSCT, DECT and SSCT studies, respectively and classified based on attenuation according to modified AHA criteria. Results: 58 coronary plaques were identified at autopsy. Regardless of the CT technique only 52/58 plaques were found at CT (sensitivity = 89.6%). There was no significant difference between the mean attenuation values of different plaque types between DSCT, DECT, and SSCT: type IV: 11 HU/8 HU/19 HU; type Va: 44 HU/45 HU/52 HU; type Vb: 1088 HU/966 HU/1079 HU). The sensitivity for correct classification varied depending on the plaque type (type II = 0%, type III = 0%, type IV = 43%, type Va = 58%, Vb = 97%). Conclusion: Independent of the used acquisition technique, SSCT, DSCT and DECT show similar results for attenuation-based characterization of atherosclerotic coronary plaques.

  20. CT Scans

    Science.gov (United States)

    ... cross-sectional pictures of your body. Doctors use CT scans to look for Broken bones Cancers Blood clots Signs of heart disease Internal bleeding During a CT scan, you lie still on a table. The table ...

  1. Whole spine CT for evaluation of scoliosis in children - Feasibility of sub-milli Sievert scanning protocol

    Energy Technology Data Exchange (ETDEWEB)

    Kalra, Mannudeep K. [Center for Medical Image Science and Visualization (CMIV), Linkoeping Univ., Linkoeping Univ. Hospital, Linkoeping (Sweden); Massachusetts General Hospital Imaging, Massachusetts General Hospital, Boston (United States); Quick, Petter; Persson, Anders [Center for Medical Image Science and Visualization (CMIV), Linkoeping Univ., Linkoeping Univ. Hospital, Linkoeping (Sweden)], e-mail: anders.persson@cmiv.liu.se; Singh, Sarabjeet [Massachusetts General Hospital Imaging, Massachusetts General Hospital, Boston (United States); Sandborg, Michael [Center for Medical Image Science and Visualization (CMIV), Linkoeping Univ., Linkoeping Univ. Hospital, Linkoeping (Sweden); Department of Radiophysics, Linkoeping Univ. Hospital, Linkoeping (Sweden)

    2013-03-15

    Background: Optimization of CT radiation dose is important for children due to their higher risk of radiation-induced adverse effects. Anatomical structures with high inherent contrast, such as bones can be imaged at very low radiation doses by optimizing scan parameters. Purpose: To assess feasibility of sub-milli Sievert whole spine CT scanning protocol for evaluation of scoliosis in children. Material and Methods: With approval of the ethical board, we performed whole spine CT for evaluation of scoliosis in 22 children (age range, 3-18 years; mean age, 13 years; 13 girls, 9 boys) on a 128-slice dual source multidetector-row CT scanner. Lowest possible quality reference mAs value (image quality factor for xy-z automatic exposure control or xyz-AEC, CARE Dose 4D) was selected on a per patient basis. Remaining parameters were held constant at 3.0:1 pitch, 128 X 0.6 mm detector collimation, 115.2 mm table feed per gantry rotation, 100 kVp, and 1 and 3 mm reconstructed sections. Average mAs, projected estimated dose savings with AEC, computed tomography dose index volume (CTDI vol), and dose length product (DLP) were recorded. Artifacts were graded on a four-point scale (1, no artifacts; 4, severe artifacts). Ability to identify vertebral and pedicular contours, and measure pedicular width and degree of vertebral rotation was graded on a three-point scale (1, unacceptable; 3, excellent). Results: All CT examinations were deemed as reliable for identifying vertebral and pedicular contours as well as for measuring pedicular width (5.9 {+-} 1.6 mm) and degree of vertebral rotation (28.7{+-} 23.4 deg). Mean objective image noise and signal to noise ratio (SNR) were 57.5 {+-} 21.5 {+-} 4.7 2.3, respectively. With a mean quality reference mAs of 13, the scanner employed an average actual effective mAs of 10 {+-} 3.8 (range, 6-18 mAs) with an estimated radiation dose saving of 43.5 {+-} 16.3% with xyz-AEC compared with fixed mAs. The mean CTDI, DLP, and estimated effective

  2. In vitro dose measurements in a human cadaver with abdomen/pelvis CT scans

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Da; Padole, Atul; Li, Xinhua; Singh, Sarabjeet; Khawaja, Ranish Deedar Ali; Lira, Diego; Shi, Jim Q.; Otrakji, Alexi; Kalra, Mannudeep K.; Liu, Bob, E-mail: bliu7@mgh.harvard.edu [Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts 02114 (United States); Liu, Tianyu; Xu, X. George [Nuclear Engineering Program, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

    2014-09-15

    Purpose: To present a study of radiation dose measurements with a human cadaver scanned on a clinical CT scanner. Methods: Multiple point dose measurements were obtained with high-accuracy Thimble ionization chambers placed inside the stomach, liver, paravertebral gutter, ascending colon, left kidney, and urinary bladder of a human cadaver (183 cm in height and 67.5 kg in weight) whose abdomen/pelvis region was scanned repeatedly with a multidetector row CT. The flat energy response and precision of the dosimeters were verified, and the slight differences in each dosimeter's response were evaluated and corrected to attain high accuracy. In addition, skin doses were measured for radiosensitive organs outside the scanned region with OSL dosimeters: the right eye, thyroid, both nipples, and the right testicle. Three scan protocols were used, which shared most scan parameters but had different kVp and mA settings: 120-kVp automA, 120-kVp 300 mA, and 100-kVp 300 mA. For each protocol three repeated scans were performed. Results: The tube starting angle (TSA) was found to randomly vary around two major conditions, which caused large fluctuations in the repeated point dose measurements: for the 120-kVp 300 mA protocol this angle changed from approximately 110° to 290°, and caused 8% − 25% difference in the point dose measured at the stomach, liver, colon, and urinary bladder. When the fluctuations of the TSA were small (within 5°), the maximum coefficient of variance was approximately 3.3%. The soft tissue absorbed doses averaged from four locations near the center of the scanned region were 27.2 ± 3.3 and 16.5 ± 2.7 mGy for the 120 and 100-kVp fixed-mA scans, respectively. These values were consistent with the corresponding size specific dose estimates within 4%. The comparison of the per-100-mAs tissue doses from the three protocols revealed that: (1) dose levels at nonsuperficial locations in the TCM scans could not be accurately deduced by simply scaling

  3. Clinical utility of coronary CT angiography with low-dose chest CT in the evaluation of patients with atypical chest pain: a preliminary report

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Soo Jin [Kimhae Bokum Hospital, Kimhae (Korea, Republic of); Choo, Ki Seok; Kim, Chang Won [Pusan National University Hospital, Busan (Korea, Republic of)] (and others)

    2008-04-15

    To determine the clinical utility of coronary CT angiography (CCTA) with low-dose chest CT in the evaluation of patients with atypical chest pain. Ninety-six patients (mean age 60.2 years; age range, 41-68 years; 70 males) were referred for CCTA with low-dose chest CT (16-slice MDCT, Siemens) for an evaluation of atypical chest pain. When significant stenoses (lumen diameter reduction > 50%) were detected on CCTA, invasive coronary angiography (CA) was performed as the standard of reference. In all patients, medical chart review or telephone contact with patients was used to evaluate the contribution of CCTA with low-dose chest CT to the final clinical diagnosis, at least 6 months after performing CCTA. Among 96 patients, seven patients (7%) had significant stenoses as detected on CCTA, whereas two patients (2%) had significant stenoses and five patients had insignificant stenoses or no stenosis, as detected on conventional catheter angiography. In 18 (19%) of the 89 patients without significant stenosis detected on CCTA, this protocol provided additional information that suggested or confirmed an alternate clinical diagnosis. In patients with atypical chest pain, CCTA with low-dose chest CT could help to exclude ischemic heart disease and could provide important ancillary information for the final diagnosis.

  4. Estimation of radiation dose and image quality of coronary 320-row area detector CT angiography by optimal prospective ECG-gated protocols for different heart rate

    International Nuclear Information System (INIS)

    The purpose of this study is to estimate radiation dose and image quality of electrocardiogram (ECG)-gated coronary 320-area detector CT (ADCT) angiography which was acquired using the protocols that were considered as optimal methods for different heart rates (HR) in 1031 consecutive patients (M/F =580/451, 65±12 yr) without arrhythmias. We set up 5 protocols for 320-ADCT based on the relationship among heart rates, temporal resolution, gantry rotation speed, optimal reconstruction phase and slow filling phase on 64-multidetector-row computed tomography (MDCT), id est (ie), 1) mid-diastolic (75% of risk ratio (RR)) 1 beat scan (moderate disability (MD) 1 beat, N=761 (73.8%)) for HR ≤60, 2) mid-diastolic (75% of RR) 2 beat scan (MD 2 beat, N=135) for 61≤ HR ≤65, 3) end-systolic and mid-diastolic (37-80% of RR) 2 beat scan (embryonic stem (ES)-MD 2 beat, N=92) for 66≤ HR ≤75, 4) end-systolic (R +280-430 ms) 2 beat scan (ES 2 beat, N=21) for 76≤ HR ≤80, and 5) end-systolic (R +250-400 ms) 3 beat scan (ES 3 beat, N=22) for 81≤ HR ≤105. Image quality was classified into 3 categories (excellent (3 points), acceptable (2 points), and unacceptable (1 point)). Scanning time, DLP.e and image quality score were 1.4±0.1 s, 220±59 mGy·cm, 3.0±0.2 points in MD 1 beat, 2.2±0.2 s, 434±118 mGy·cm, 2.9±0.3 points in MD 2 beat, 2.1±0.2 s, 729±229 mGy·cm, 2.7±0.5 points in ES-MD 2 beat, 1.9±0.1 s, 432±148 mGy·cm, 2.2±0.6 points in ES 2 beat, and 2.4±0.2 s, 669±152 mGy·cm, 2.3±0.6 points in ES 3 beat respectively. In conclusion, the prospective ECG-gated scan protocol for coronary 320-ADCT angiography in any HR group was considered reasonable and proper for image quality and radiation dose. (author)

  5. Multidetector CT (MD-CT) in the diagnosis of uncertain open globe injuries

    Energy Technology Data Exchange (ETDEWEB)

    Hoffstetter, P.; Schreyer, A.G.; Jung, E.M.; Heiss, P.; Zorger, N. [Inst. fuer Roentgendiagnostik, Universitaetsklinikum Regensburg (Germany); Schreyer, C.I.; Framme, C. [Klink und Poliklinik fuer Augenheilkunde, Universitaetsklinikum Regensburg (Germany)

    2010-02-15

    Purpose: To evaluate the significance of multislice CT for the diagnosis of uncertain penetrating globe injuries. Materials and Methods: Based on a retrospective chart review between 2002 and 2007, we identified 59 patients presenting with severe ocular trauma with uncertain rupture of the globe due to massive subconjunctival and/or anterior chamber hemorrhage. The IOP (intraocular pressure) was within normal range in all patients. High resolution multidetector CT (MD-CT) scans (16 slice scans) with axial and coronar reconstructions were performed in all patients. The affected eye was examined for signs of penetrating injury such as abnormal eye shape, scleral irregularities, lens dislocation or intravitreal hemorrhages. Four experienced radiologists read the CT scans independently. Beside the diagnosis, the relevant morphological criteria and the optimal plane orientation (axial or coronar) were specified. The sensitivity, specificity, and negative and positive predictive value were calculated. Additionally the interobserver variability was determined by applying the Cohen's kappa test. Surgical sclera inspections were performed in all cases as a standard of reference. The evaluations of the CT examination were compared with the surgery reports. Results: 59 patients were evaluated (42 men, 17 women). The mean age was 29 years (range 7-91). In 17 patients a rupture of the globe was diagnosed during surgery. 12 of these 17 penetrating injuries (70.6%) were classified correctly by MDCT, 5 of the 17 (29.4%) were not detectable. 42 patients did not have an open globe injury. 41 of these patients were diagnosed correctly negative by MDCT, and one patient was classified false positive. This results in a sensitivity of 70% with a specificity of 98%. There was high inter-rater agreement with kappa values between 0.89-0.96. Most discrepancies were caused by wrong negative findings. The most frequent morphologic criteria for open globe injury were the deformation (n

  6. 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

  7. 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.

  8. Pulmonary nodules: optimal slice thickness of CT in revealing bronchial imageology

    Institute of Scientific and Technical Information of China (English)

    Shenjiang Li; Yuanyuan Wang; Changcheng Li; Xing Wang; Debin Liu; Wenjie Liang; Feng Zhu; Yan Zhu; Xuefeng Cui; Fangang Hu

    2011-01-01

    Objective: The aim of our study was to determine an optimal slice thickness that was efficient in revealing bronchial imageology of pulmonary nodules (PNs) on multi-slice spiral computed tomography (MSCT) images preliminarily. Methods: Fifty-four patients with 62 PNs (diameter ≤ 3 cm) underwent multidetector-row computed tomography of the chest in a single-breath-hold technique. The raw data were acquired with a collimation of 0.625 mm. Three sets of contiguous im-ages were reconstructed with 1-, 2-, and 5-mm slice thickness, respectively. Bronchial imageology of SPNs on the CT images presented in 1-, 2-, and 5-mm slice thickness was compared. Using the 1-mm sections as the gold standard, an optimal slice thickness in revealing bronchial imageology of PNs was determined. Results: Bronchial imageology of PNs on the CT im-ages presented in 1 mm slice thickness involved 85 bronchi (35 second-fourth generation bronchi; 50 fifth-eighth generation bronchi). Bronchial imageology on 2-mm-thick sections was as same as that on 1-mm-thick sections in 34 second- fourth generation bronchi. No statistically significant difference in number of second- fourth generation bronchi with same bronchial imageology was found between that on 2-mm-thick images and 1-mm-thick images (P = 0.836 > 0.05). Bronchial imageology on 5-mm-thick sections was as same as that on 1-mm-thick sections in 24 second-fourth generation bronchi. There was statistically significant difference in number of second-fourth generation bronchi with same bronchial imageology between that on 5-mm-thick images and 1-mm-thick images (P = 0.026 < 0.05). Bronchial imageology on 2-mm-thick sections was as same as that on 1-mm-thick sections in 38 fifth-eighth generation bronchi. There was statistically significant difference in number of fifth-eighth generation bronchi with same bronchial imageology between that on 2-mm-thick images and 1-mm-thick images (P = 0.029 < 0.05). Bronchial imageology on 5-mm-thick images was

  9. Radiochromic films for dental CT dosimetry: a feasibility study.

    Science.gov (United States)

    Rampado, O; Bianchi, S D; Peruzzo Cornetto, A; Rossetti, V; Ropolo, R

    2014-02-01

    Dental CT dose evaluations are commonly performed using thermoluminescent dosimeters (TLD) inside anthropomorphic phantoms. Radiochromic films with good sensitivity in the X-ray diagnostic field have recently been developed and are commercially available as GAFCHROMIC XR-QA. There are potential advantages in the use of radiochromic films such as a more comprehensive dosimetry thanks to the adjustable size of the film samples. The purpose of this study was to investigate the feasibility of using radiochromic films for dental CT dose evaluations. Film samples were cut with a width of 5mm and a length of 25 mm (strips), the same size as the Alderson Rando anthropomorphic phantom holes used in this study. Dental CT dose measurements were performed using simultaneously both TLD and radiochromic strips in the same phantom sites. Two equipment types were considered for dental CT examinations: a 16 slice CT and a cone beam CT. Organ equivalent doses were then obtained averaging the measurements from the sites of the same organ and effective doses were calculated using ICRP 103 weighting factors. The entire procedure was repeated four times for each CT in order to compare also the repeatability of the two dosimeter types. A linear correlation was found between the absorbed dose evaluated with radiochromic films and with TLD, with slopes of 0.930 and 0.944 (correlation r>0.99). The maximum difference between the two dosimeter's measurements was 25%, whereas the average difference was 7%. The measurement repeatability was comparable for the two dosimeters at cumulative doses above 15 mGy (estimated uncertainty at 1 sigma level of about 5%), whereas below this threshold radiochromic films show a greater dispersion of data, of about 10% at 1 sigma level. We obtained, using respectively Gafchromic and TLD measurements, effective dose values of 107 μSv and 117 μSv (i.e. difference of 8.6%) for the cone beam CT and of 523 μSv and 562 μSv (i.e. difference of 7%) for the

  10. VALIDITY OF CONTRAST ENHANCED CT IN THE ASSESSMENT OF ACUTE PANCREATITIS AND ITS RELATED COMPLICATIONS

    Directory of Open Access Journals (Sweden)

    Mannivanan

    2016-03-01

    Full Text Available BACKGROUND In the earlier days, ultrasonogram was considered as one of the most important investigation for pancreatitis, later the clinicians started using cholangiography in acute pancreatitis, but today CT is considered as a gold standard test in the diagnosis of acute pancreatitis. Though the sensitivity of CT in diagnosing acute pancreatitis was not studied much particularly in a mild case, but a good-quality contrast enhanced CT demonstrates distinct pancreatic and peri-pancreatic abnormalities. AIM To assess the importance of computed tomography in diagnosing acute pancreatitis and its related complications. MATERIALS AND METHODS A prospective study was conducted on 150 patients with clinically suspected pancreatitis. CT was performed on all the patients with Siemens Spiral CT scanner Sensation 16 slice. Oral contrast of was 1000 mL given one hour prior to the scan in the form of taking 250 mL every 15 mins. The CT severity index (CTSI and the necrosis point scoring was used to assess the severity of acute pancreatitis. All the complications related to acute pancreatitis were also assessed. RESULTS The CT analysis in the detection of acute pancreatitis showed the sensitivity of 100% and the positive predictive value of 97.3%. The severity index of acute pancreatitis based on the CT imaging had shown that majority of the patients are with moderate (60.6% level of acute pancreatitis. The necrosis point scoring showed that 54.6% of the patients had necrosis involving less than 30% of the pancreas. Among the various complications detected by CECT the commonest were pleural effusion and ascites. CONCLUSION CECT is the most important gold standard technique both for diagnosis as well as for predicting the prognosis in acute pancreatitis. The clinicians should routinely send the patient for the CT imaging whenever there is a suspicion of pancreatitis clinically.

  11. 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.)

  12. CT pelvimetry

    International Nuclear Information System (INIS)

    Pelvimetry aims at providing the obstetrician with information on the size and morphology of the female pelvis, thus enabling him to assess the obstetrical prognosis as accurately as possible. Computed tomography (CT) has several advantages, in particular the lower mother and fetus radiation dose. After a brief description of obstetrical anatomy, the usual CT exploration method is presented and its results are considered in terms of measurements, indices and morphological findings. If performed with a very strict exploration procedure, CT pelvimetry is a very reliable, fact and comfortable method of examination. All these advantages, combined with the minimized patient dose, should lead to an increasingly widespread use of this technique

  13. CT scan

    Science.gov (United States)

    ... come from a CT scan. Some people have allergies to contrast dye. Let your doctor know if you have ... vein contains iodine. If you have an iodine allergy, a type of contrast may cause nausea or vomiting , sneezing , itching , or ...

  14. Multidetector CT for congenital heart patients: what a paediatric radiologist should know

    Energy Technology Data Exchange (ETDEWEB)

    Paul, Jean-Francois; Rohnean, Adela; Sigal-Cinqualbre, Anne [Radiology Unit, Marie Lannelongue Hospital, Plessis-Robinson (France)

    2010-06-15

    Multidetector CT (MDCT) is increasingly used for imaging congenital heart disease (CHD) patients in addition to echocardiography, due to its ability to provide high quality three-dimensional images, giving a comprehensive evaluation of complex heart malformations. Using 4-slice or 16-slice CT, diagnostic information in CHD patients is limited to extra-cardiac anatomy, mainly the pulmonary arteries, aorta and venous connections. Due to high heart rates in babies however, coronary evaluation and intra-cardiac analysis were not reliable with the first generations of MDCT. Larger detector size with 64-slice CT and faster acquisition time, up to 75 ms for one slice, has progressively improved coronary and intra-cardiac visualization. Because radiation dose is the main concern, especially in children, every attempt to minimize dose whilst preserving image quality is important: the ALARA concept should always be applied in this population. The 80 kVp setting is now well accepted as a standard for more and more radiological teams involved in CT of children. Different acquisition strategies are now possible for childhood coronary imaging, using retrospective or even prospective gating. Using the latest technology, sub-mSv acquisitions are now attainable for scanning a whole thorax, providing a complete analysis of any 3-D cardiac malformation, including coronary artery course visualisation. This review will describe how technological developments have improved image quality with continuous reduction of radiation dose. (orig.)

  15. Incorporating multislice imaging into x-ray CT polymer gel dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Johnston, H., E-mail: holly.johnston@utsw.edu [Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8W 2Y2 (Canada); Hilts, M. [Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8W 2Y2, Canada and Medical Physics, BC Cancer Agency, Vancouver Island Centre, Victoria, British Columbia V8R 6V5 (Canada); Jirasek, A. [Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8W 2Y2, Canada and Department of Physics, University of British Columbia—Okanagan Campus, Kelowna, British Columbia V1V 1V7 (Canada)

    2015-04-15

    Purpose: To evaluate multislice computed tomography (CT) scanning for fast and reliable readout of radiation therapy (RT) dose distributions using CT polymer gel dosimetry (PGD) and to establish a baseline assessment of image noise and uniformity in an unirradiated gel dosimeter. Methods: A 16-slice CT scanner was used to acquire images through a 1 L cylinder filled with water. Additional images were collected using a single slice machine. The variability in CT number (N{sub CT}) associated with the anode heel effect was evaluated and used to define a new slice-by-slice background subtraction artifact removal technique for CT PGD. Image quality was assessed for the multislice system by evaluating image noise and uniformity. The agreement in N{sub CT} for slices acquired simultaneously using the multislice detector array was also examined. Further study was performed to assess the effects of increasing x-ray tube load on the constancy of measured N{sub CT} and overall scan time. In all cases, results were compared to the single slice machine. Finally, images were collected throughout the volume of an unirradiated gel dosimeter to quantify image noise and uniformity before radiation is delivered. Results: Slice-by-slice background subtraction effectively removes the variability in N{sub CT} observed across images acquired simultaneously using the multislice scanner and is the recommended background subtraction method when using a multislice CT system. Image noise was higher for the multislice system compared to the single slice scanner, but overall image quality was comparable between the two systems. Further study showed N{sub CT} was consistent across image slices acquired simultaneously using the multislice detector array for each detector configuration of the slice thicknesses examined. In addition, the multislice system was found to eliminate variations in N{sub CT} due to increasing x-ray tube load and reduce scanning time by a factor of 4 when compared to

  16. 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.

  17. A technical solution to avoid partial scan artifacts in cardiac MDCT

    OpenAIRE

    Primaka, A. N.; Dong, Y; Dzyubak, O. P.; Jorgensen, S. M.; McCollough, C. H.; Ritman, E.L. (Erik L.)

    2007-01-01

    Quantitative evaluation of cardiac image data obtained using multidetector row computed tomography (CT) is compromised by partial scan reconstructions, which improve the temporal resolution but significantly increase image-to-image CT number variations for a fixed region of interest compared to full reconstruction images. The feasibility of a new approach to solve this problem is assessed. An anthropomorphic cardiac phantom and an anesthetized pig were scanned on a dual-source CT scanner usin...

  18. 胃肿瘤CT灌注成像的临床研究%Clinical study of stomach neoplasm CT perfusion imaging

    Institute of Scientific and Technical Information of China (English)

    Zhiyong Li; Ying Ge; Jinghong Liu; Keli Wang; Jianlin Wu

    2009-01-01

    Objection: The purpose of this study is preliminarily to discuss stomach perfusion imaging technique with Multi-slice CT and its clinical application value in stomach neoplasm. Methods: Fifteen patients with known stomach neoplasm performed perfusion imaging with 4 or 16 slice CT. Performing peffusion imaging in central slice of neoplasm, using CT cine scan, slice thick 10 mm/2i; with high pressure syringe, injecting quickly from right elbow-front vein, dosage 45-50 mL, injec-tion rate 3.5-4.0 mL/s, scanning delay time 5 s, scanning total time 45 s. We performed perfusion CT post-processing using pancreatic mode of perfusion CT software. Blood flow (BF), blood volume (BV), mean transit time (MTT), and permeability surface (PS) of gastric wall and tumor were computed for every case. Results: BF, BV, MTT and PS of gastric tumor were 116.68±90.09 mL/(min .100 g), 9.57±8.12 mL/100 g, 10.07± 7.74 s, 20.78±19.68 mL/ (min .100 g), respectively. The P values for each CT perfusion parameters between gastdc tumor and normal gastric wall were 0.001,0.021, 0.155 and 0.031,respectively. Conclusion: Perfusion CT can provide hemodynamics of gastdc tumors and play a key role in the diagnosis of gastric tumors. It's clinical application prospect will be fully broad.

  19. Four-Dimensional Computerized Tomography (4D-CT) Reconstruction Based on the Similarity Measure of Spatial Adjacent Images

    Institute of Scientific and Technical Information of China (English)

    ZHANG Shu-xu; ZHOU Ling-hong; CHEN Guang-jie; LIN Sheng-qu; YE Yu-sheng; ZHANG Hai-nan

    2008-01-01

    Objective:To investigate the feasibility of a 4D-CT reconstruction method based on the similarity principle of spatial adjacent images and mutual information measure. Methods:A motor driven sinusoidal motion platform made in house was used to create one-dimensional periodical motion that was along the longitudinal axis of the CT couch. The amplitude of sinusoidal motion was set to an amplitude of ±1 cm. The period of the motion was adjustable and set to 3.5 s. Phantom objects of two eggs were placed in a Styrofoam block, which in turn were placed on the motion platform. These objects were used to simulate volumes of interest undergoing ideal periodic motion. CT data of static phantom were acquired using a multi-slice general electric (GE) LightSpeed 16-slice CT scanner in an axial mode. And the CT data of periodical motion phantom were acquired in an axial and cine-mode scan. A software program was developed by using VC++ and VTK software tools to resort the CT data and reconstruct the 4D-CT. Then all of the CT data with same phase were sorted by the program into the same series based on the similarity principle of spatial adjacent images and mutual information measure among them, and 3D reconstruction of different phase CT data were completed by using the software. Results:All of the CT data were sorted accurately into different series based on the similarity principle of spatial adjacent images and mutual information measures among them. Compared with the unsorted CT data, the motion artifacts in the 3D reconstruction of sorted CT data were reduced significantly, and all of the sorted CT series result in a 4D-CT that reflected the characteristic of the periodical motion phantom. Conclusion:Time-resolved 4D-CT reconstruction can be implemented with any general multi-slice CT scanners based on the similarity principle of spatial adjacent images and mutual information measure.The process of the 4D-CT data acquisition and reconstruction were not restricted to the

  20. 99mTc sestamibi SPECT/CT for preoperative localization of parathyroid adenoma in patients with primary hyperparathyreoidismus

    International Nuclear Information System (INIS)

    Full text:Introduction: Surgical removal of the hyper-functioning parathyroid gland is a method of choice in the treatment of adenoma or hyperplasia of the parathyroid glands. The accurate preoperative localization of the adenoma or hyperplasia of the parathyroid glands determines the minimally invasive surgical procedure. The aim of the study was to determine the role of SPECT / CT (16 slice) in the diagnostic algorithm. Materials and Methods: Twenty five patients with parathyroid hormone levels over 80 pg/ml were tested in the period November 2012 - May 2013. SPECT / CT with 99mTc -sestamibi with indicator activity 740 MBq is done in all patients after 1 hour IV application of the radiopharmaceutical. The preoperative localization of the adenoma or hyperplasia of the parathyroid glands is in combination with ultrasound of the thyroid and parathyroid glands with high-frequency transducer. Results: In 23 patients 99mTc sestamibi SPECT / CT there were positive findings (92%) in 2 patients (8%) it was negative. Four patients with positive SPECT / CT sestamibi parathyroid scan were with poly-nodular involvement of the parathyroid glands. One patient was with an ectopic (mediastinal) localization of parathyroid adenoma. Ultrasonographic findings directed to adenoma or hyperplasia in the parathyroid glands in 17 patients (68 %). Conclusion: SPECT / CT is the method of choice for preoperative localization of adenoma or hyperplasia of the parathyroid glands due to the accurate anatomic-tomography localization, especially in those cases with poly glandular involvement , para- , and retrotracheal ectopic localization

  1. Prospective evaluation of the radiologist's hand dose in CT-guided interventions; Prospektive Evaluation der Handdosis des Radiologen im Rahmen von CT-gestuetzten Interventionen

    Energy Technology Data Exchange (ETDEWEB)

    Rogits, B.; Jungnickel, K.; Loewenthal, D.; Dudeck, O.; Pech, M.; Ricke, J. [Magdeburg Univ. (Germany). Radiology and Nuclear Medicine; Kropf, S. [Magdeburg Univ. (Germany). Dept. of Biometry and Medical Informatics; Nekolla, E.A. [The Federal Office for Radiation Protection, Neuherberg (Germany). Dept. of Radiation Protection and Health; Wieners, G. [Charite CVC, Berlin (Germany). Dept. of Radiology

    2013-11-15

    Purpose: Assessment of radiologist's hand dose in CT-guided interventions and determination of influencing factors. Materials and Methods: The following CT-guided interventions were included: Core biopsy, drainage, periradicular therapy, and celiac plexus neurolysis. The hand dose was measured with an immediately readable dosimeter, the EDD-30 (Unfors, Sweden). The default parameters for CT fluoroscopy were 120 kV, 90 mA and a 4 mm slice thickness. All interventions were performed on a 16-slice CT unit (Aquilion 16 Toshiba, Japan). The tumor size, degree of difficulty (1 - 3), level of experience and device parameters (mAs, dose-length product, scan time) were documented. Results: 138 CT-guided interventions (biopsy n = 99, drainage n = 23, pain therapy n = 16) at different locations (lung n = 41, retroperitoneum n = 53, liver n = 25, spine n = 19) were included. The lesion size was 4 - 240 mm (median: 23 mm). The fluoroscopy time per intervention was 4.6 - 140.2 s (median: 24.2 s). The measured hand dose ranged from 0.001 - 3.02 mSv (median: 0.22 mSv). The median hand dose for lung puncture (n = 41) was slightly higher (median: 0.32 mSv, p = 0.01) compared to that for the liver, retroperitoneum and other. Besides physical influencing factors, the degree of difficulty (p = 0.001) and summed puncture depth (p = 0.004) correlated significantly with the hand dose. Conclusion: The median hand dose for different CT-guided interventions was 0.22 mSv. Therefore, the annual hand dose limit would normally only be reached with about 2000 interventions. (orig.)

  2. Thin slice three dimentional (3D reconstruction versus CT 3D reconstruction of human breast cancer

    Directory of Open Access Journals (Sweden)

    Yi Zhang

    2013-01-01

    Full Text Available Background & objectives: With improvement in the early diagnosis of breast cancer, breast conserving therapy (BCT is being increasingly used. Precise preoperative evaluation of the incision margin is, therefore, very important. Utilizing three dimentional (3D images in a preoperative evaluation for breast conserving surgery has considerable significance, but the currently 3D CT scan reconstruction commonly used has problems in accurately displaying breast cancer. Thin slice 3D reconstruction is also widely used now to delineate organs and tissues of breast cancers. This study was aimed to compare 3D CT with thin slice 3D reconstruction in breast cancer patients to find a better technique for accurate evaluation of breast cancer. Methods: A total of 16-slice spiral CT scans and 3D reconstructions were performed on 15 breast cancer patients. All patients had been treated with modified radical mastectomy; 2D and 3D images of breast and tumours were obtained. The specimens were fixed and sliced at 2 mm thickness to obtain serial thin slice images, and reconstructed using 3D DOCTOR software to gain 3D images. Results: Compared with 2D CT images, thin slice images showed more clearly the morphological characteristics of tumour, breast tissues and the margins of different tissues in each slice. After 3D reconstruction, the tumour shapes obtained by the two reconstruction methods were basically the same, but the thin slice 3D reconstruction showed the tumour margins more clearly. Interpretation & conclusions: Compared with 3D CT reconstruction, thin slice 3D reconstruction of breast tumour gave clearer images, which could provide guidance for the observation and application of CT 3D reconstructed images and contribute to the accurate evaluation of tumours using CT imaging technology.

  3. 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.

  4. The optimization of the use of CT equipment; Tietokonetomografialaitteiden kaeytoen optimointi

    Energy Technology Data Exchange (ETDEWEB)

    Karppinen, J.; Jaervinen, H.

    2006-11-15

    The collective dose to patients from CT examinations is about 40 % of the dose from all X-ray examinations, in spite of the small proportion of CT examinations (5 % in Finland in 2000). The development of CT equipment has been very rapid and multislice equipment are gradually replacing single-slice equipment. For these reasons, the Radiation and Nuclear Safety Authority (STUK) has studied the dose to patients from CT examinations, the relevance of the present Diagnostic Reference Levels (DRL) for CT examinations, and the current practices of quality control (QC) for CT equipment. The data on the CT equipment used in Finland was collected and on the number and practices of the most common CT examinations were surveyed. The data on CT examinations were obtained from all university hospitals, eight central hospitals, four regional hospitals and six private hospitals. The dose to patient was measured for four most common CT examinations in Finland (head, chest, abdomen and lumbar spine) using the routine CT protocols of the health care units. The measurements were carried out for the total of 53 CT equipment including 29 units of multislice equipment (2-16 slices). About 80 % of all CT equipment and all different types and manufacturers were covered. The measurement of the dose-length-product (DLPw) was carried out in standardized head and body phantoms of PMMA using a method developed at STUK, where the phantom is hung up above the couch inside the gantry. This method enables to obtain the DLPw-value directly for the total CT examination. The number of CT equipment in Finland (about 70 units) has increased about one unit per year. Compared with the data from 2000, the relative number of CT examinations in the regional hospitals has increased from 5 % to 9 %, while in the central hospitals it has remained about unchanged (11.8 %). The most common CT examination is still the native CT examination of head, which comprise about half of all CT examinations. The development

  5. Computed Tomography (CT) -- Sinuses

    Science.gov (United States)

    ... Physician Resources Professions Site Index A-Z Computed Tomography (CT) - Sinuses Computed tomography (CT) of the sinuses ... CT of the Sinuses? What is CT (Computed Tomography) of the Sinuses? Computed tomography, more commonly known ...

  6. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... Physician Resources Professions Site Index A-Z Computed Tomography (CT) - Sinuses Computed tomography (CT) of the sinuses ... CT of the Sinuses? What is CT (Computed Tomography) of the Sinuses? Computed tomography, more commonly known ...

  7. SU-E-T-541: Measurement of CT Density Model Variations and the Impact On the Accuracy of Monte Carlo (MC) Dose Calculation in Stereotactic Body Radiation Therapy for Lung Cancer

    Energy Technology Data Exchange (ETDEWEB)

    Xiang, H [Department of Radiation Oncology, Boston University School of Medicine and Boston Medical Center, Boston, MA (United States); Li, B; Behrman, R [Department of Radiology, Boston University Medical Center, Boston, MA (United States); Russo, G; Kachnic, L [Department of Radiation Oncology, Boston University School of Medicine and Boston Medical Center, Boston, MA (United States); Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA (United States); Lu, H [Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA (United States); Fernando, H [Department of Surgery, Boston University School of Medicine and Boston Medical Center, Boston, MA (United States)

    2015-06-15

    Purpose: To measure the CT density model variations between different CT scanners used for treatment planning and impact on the accuracy of MC dose calculation in lung SBRT. Methods: A Gammex electron density phantom (RMI 465) was scanned on two 64-slice CT scanners (GE LightSpeed VCT64) and a 16-slice CT (Philips Brilliance Big Bore CT). All three scanners had been used to acquire CT for CyberKnife lung SBRT treatment planning. To minimize the influences of beam hardening and scatter for improving reproducibility, three scans were acquired with the phantom rotated 120° between scans. The mean CT HU of each density insert, averaged over the three scans, was used to build the CT density models. For 14 patient plans, repeat MC dose calculations were performed by using the scanner-specific CT density models and compared to a baseline CT density model in the base plans. All dose re-calculations were done using the same plan beam configurations and MUs. Comparisons of dosimetric parameters included PTV volume covered by prescription dose, mean PTV dose, V5 and V20 for lungs, and the maximum dose to the closest critical organ. Results: Up to 50.7 HU variations in CT density models were observed over the baseline CT density model. For 14 patient plans examined, maximum differences in MC dose re-calculations were less than 2% in 71.4% of the cases, less than 5% in 85.7% of the cases, and 5–10% for 14.3% of the cases. As all the base plans well exceeded the clinical objectives of target coverage and OAR sparing, none of the observed differences led to clinically significant concerns. Conclusion: Marked variations of CT density models were observed for three different CT scanners. Though the differences can cause up to 5–10% differences in MC dose calculations, it was found that they caused no clinically significant concerns.

  8. CT coronary angiography in patients with atrial fibrillation; CT-Koronarangiographie bei Patienten mit Vorhofflimmern

    Energy Technology Data Exchange (ETDEWEB)

    Kovacs, A.; Sommer, T.; Leiss, A.; Naehle, P.; Schild, H.; Flacke, S. [Universitaetsklinikum Bonn, Radiologische Klinik (Germany); Probst, C.; Welz, A. [Universitaetsklinikum Bonn, Klinik fuer Herzchirurgie (Germany)

    2005-12-15

    Purpose: Reliable visualization of the coronary arteries with multislice spiral CT angiography (MSCTA) in patients with atrial fibrillation (AF) remains a challenge despite retrospective ECG gating. A recently developed new algorithm automatically compensates dynamic changes in the heart rate during the scan, thus reducing misregistration and motion artifacts. The HeartBeat-RT algorithm combines a fixed percent delay determined from the first R wave and the fixed offset delay based on the second R wave in the ECG cycle. The purpose of this study was to find out the optimal reconstruction window in MSCTA in patients with AF for each of the three major coronary arteries during the cardiac cycle. Materials and methods: 20 patients with permanent AF were imaged on a 16-slice scanner (slice collimation: 16 x 0.75 mm; rotation time 0.42 s; 140 kV; 380 mAs; 120 ml Ultravist 370 {sup registered} i.v.). The patients had not received any previous drugs for heart frequency regulation. Acquisition was started after bolus tracking of a biphasic bolus of 120 ml Ultravist 370 injected intravenously. Each coronary segment was reconstructed at 0%-90% of the cardiac cycle in increments of 10%. For image analysis we used coronary segments as defined by the American Heart Association. Two blinded independent readers assessed the image quality in terms of visibility and artifacts (five-point rating scale 1=very poor, 2=poor, 3=fair, 4=good and 5=excellent) and the degree of stenosis (five-point rating scale 1=0%, 2=1%-49%, 3=50%-74%, 4=75%-99%, 5=100%) on axial slices, multiplanar reconstructions and three-dimensional volume-rendered images. (orig.)

  9. Cardiac CT

    Energy Technology Data Exchange (ETDEWEB)

    Dewey, Marc [Charite - Universitaetsmedizin Berlin (Germany). Inst. fuer Radiologie

    2011-07-01

    Computed tomography of the heart has become a highly accurate diagnostic modality that is attracting increasing attention. This extensively illustrated book aims to assist the reader in integrating cardiac CT into daily clinical practice, while also reviewing its current technical status and applications. Clear guidance is provided on the performance and interpretation of imaging using the latest technology, which offers greater coverage, better spatial resolution, and faster imaging. The specific features of scanners from all four main vendors, including those that have only recently become available, are presented. Among the wide range of applications and issues to be discussed are coronary artery bypass grafts, stents, plaques, and anomalies, cardiac valves, congenital and acquired heart disease, and radiation exposure. Upcoming clinical uses of cardiac CT, such as plaque imaging and functional assessment, are also explored. (orig.)

  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. The feasibility of axial and coronal combined imaging using multi-detector row computed tomography for the diagnosis and treatment of a primary spontaneous pneumothorax

    Directory of Open Access Journals (Sweden)

    Kim Do

    2011-05-01

    Full Text Available Abstract Background The preoperative detection of emphysema like changes (ELCs is necessary for the successful treatment of pneumothorax. High resolution computed tomography (HRCT has been used for the preoperative detection of ELCs. However, the traditional HRCT method uses only the axial view, which is perpendicular to the distribution of ELCs. This is not an ideal diagnostic method for the evaluation of ELCs. Methods Forty-eight patients with pneumothorax had multi-detector computed tomography (MDCT reconstruction using the coronal view. ELCs were evaluated in the axial and coronal view by a radiologist. A surgeon performed intra-operative examinations of the ELCs. The sensitivity of the different views was compared. Results The detection sensitivity was 74.4% (70/94 for the axial view and 91.5% (86/94 for the axial-coronal combined view. The intra-operative detection rate was 95.7% (90/94. The preoperative detection of ELCs on the axial-coronal combined view was significantly higher than on the conventional axial view alone (p Conclusions Evaluation of ELCs on the axial and coronal combined HRCT improved the sensitivity of preoperative detection of ELCs compared to the conventional single axial HRCT. This increased sensitivity will help decrease the recurrence with VATS.

  12. 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 ...

  13. Application of direct CT venography in upper extremity deep vein diseases%直接法 CTV 在上肢深静脉疾病中的应用

    Institute of Scientific and Technical Information of China (English)

    李治; 樊健慧

    2014-01-01

    Objective to explore the application value and scanning techniques of direct ct venography in upper extremity deep vein diseases. Methods 31 cases of patients who were highly suspected with upper limb vein stenosis or occlusion were examined by direct venography including 27 cases of dual-source ct and 7 cases of 16-slice ct. then multi—planar reconstruction(MPr), maximum intensity projection(MiP), volume rendering(Vr) and curved planar reformation (cPr) were used to treat the images. Results location, range, degree, condition of outer surface and its collateral circulation of patients with upper extremity deep vein stenosis can be seen clearly from 31 cases on ct images. Conclusions the direct ct venography can be used in 16 or more than 16 -slice ct. it can help to show upper extremity deep vein stenosis and thrombosis, with fast, noninvasive and clear advantages. and it’s very helpful for the judgement of upper extremity deep vein stenosis and thrombosis as well as important evidence for clinical treatment and clinical evaluation.%目的:探讨直接法 ct 静脉成像在上肢深静脉疾病中的应用价值及扫描技术要点。方法对31例临床考虑上肢静脉狭窄、闭塞等疾病患者行直接法 ct(双源 ct 24例、16排 ct 7例)静脉成像,采用多平面重建(MPr)、最大密度投影(MiP)、容积再现(Vr)、曲面重组(cPr)等方法进行后处理。结果31例患者均能清楚显示病变位置、范围及程度腔外情况及周围侧枝开放情况。结论 ct 直接法静脉造影可在16排及以上 ct 开展,能快速、无创、清晰地显示病变的部位、范围、侧支循环建立情况及病变原因,可作为上肢深静脉疾病诊断的可靠手段,还可为临床治疗及疗效评估提供重要依据。

  14. CT and MRI Determination of Intermuscular Space within Lumbar Paraspinal Muscles at Different Intervertebral Disc Levels.

    Directory of Open Access Journals (Sweden)

    Xuefei Deng

    Full Text Available Recognition of the intermuscular spaces within lumbar paraspinal muscles is critically important for using the paramedian muscle-splitting approach to the lumbar spine. As such, it is important to determine the intermuscular spaces within the lumbar paraspinal muscles by utilizing modern medical imaging such as computed tomography (CT and magnetic resonance imaging (MRI.A total of 30 adult cadavers were studied by sectional anatomic dissection, and 60 patients were examined using CT (16 slices, 3-mm thickness, 3-mm intersection gap, n = 30 and MRI (3.0T, T2-WI, 5-mm thickness, 1-mm intersection gap, n = 30. The distances between the midline and the superficial points of the intermuscular spaces at different intervertebral disc levels were measured.Based on study of our cadavers, the mean distances from the midline to the intermuscular space between multifidus and longissimus, from intervertebral disc levels L1-L2 to L5-S1, were 0.9, 1.1, 1.7, 3.0, and 3.5 cm, respectively. Compared with the upper levels (L1-L3, the superficial location at the lower level (L4-S1 is more laterally to the midline (P<0.05. The intermuscular space between sacrospinalis and quadratus lumborum, and that between longissimus and iliocostalis did not exist at L4-S1. The intermuscular spaces in patients also varied at different levels of the lumbar spine showing a low discontinuous density in CT and a high signal in MRI. There were no significant differences between the observations in cadavers and those made using CT and MRI.The intermuscular spaces within the paraspinal muscles vary at different intervertebral disc levels. Preoperative CT and MRI can facilitate selection of the muscle-splitting approach to the lumbar spine. This paper demonstrates the efficacy of medical imaging techniques in surgical planning.

  15. Radiation dose from multidetector CT studies in children: results from the first Italian nationwide survey

    International Nuclear Information System (INIS)

    Multidetector CT (MDCT) scanners have contributed to the widespread use of CT in paediatric imaging. However, concerns are raised for the associated radiation exposure. Very few surveys on radiation exposure from MDCT studies in children are available. The aim of this study was to outline the status of radiation exposure in children from MDCT practice in Italy. In this retrospective multicentre study we asked Italian radiology units with an MDCT scanner with at least 16 slices to provide dosimetric and acquisition parameters of CT examinations in three age groups (1-5, 6-10, 11-15 years) for studies of head, chest and abdomen. The dosimetric results were reported in terms of third-quartile volumetric CT dose index (CTDIvol) (mGy), size-specific dose estimate (SSDE) (mGy), dose length product (DLP) (mGy cm), and total DLP for multiphase studies. These results were compared with paediatric European and adult Italian published data. A multivariate analysis assessed the association of CTDIvol with patient characteristics and scanning modalities. We collected data from 993 MDCT examinations performed at 25 centres. For age groups 1-5 years, 6-10 years and 11-15 years, the CTDIvol, DLP and total DLP values were statistically significantly below the values observed in our analogous national survey in adults, although the difference decreased with increasing age. CTDIvol variability among centres was statistically significant (variance = 0.07; 95% confidence interval = 0.03-0.16; P < 0.001). This study reviewed practice in Italian centres performing paediatric imaging with MDCT scanners. The variability of doses among centres suggests that the use of standardised CT protocols should be encouraged. (orig.)

  16. Radiation dose from multidetector CT studies in children: results from the first Italian nationwide survey

    Energy Technology Data Exchange (ETDEWEB)

    Granata, Claudio [IRCCS Istituto Giannina Gaslini, Department of Radiology, Genoa (Italy); Origgi, Daniela; Palorini, Federica [Istituto Europeo di Oncologia, Department of Medical Physics, Milan (Italy); Matranga, Domenica [University of Palermo, Department of Sciences for Health Promotion and Mother and Child Care ' ' G. D' Alessandro' ' , Palermo (Italy); Salerno, Sergio [University of Palermo, Department of Medical and Forensic Biopathology and Biotechnologies, Section of Radiology, Palermo (Italy)

    2015-05-01

    Multidetector CT (MDCT) scanners have contributed to the widespread use of CT in paediatric imaging. However, concerns are raised for the associated radiation exposure. Very few surveys on radiation exposure from MDCT studies in children are available. The aim of this study was to outline the status of radiation exposure in children from MDCT practice in Italy. In this retrospective multicentre study we asked Italian radiology units with an MDCT scanner with at least 16 slices to provide dosimetric and acquisition parameters of CT examinations in three age groups (1-5, 6-10, 11-15 years) for studies of head, chest and abdomen. The dosimetric results were reported in terms of third-quartile volumetric CT dose index (CTDI{sub vol}) (mGy), size-specific dose estimate (SSDE) (mGy), dose length product (DLP) (mGy cm), and total DLP for multiphase studies. These results were compared with paediatric European and adult Italian published data. A multivariate analysis assessed the association of CTDI{sub vol} with patient characteristics and scanning modalities. We collected data from 993 MDCT examinations performed at 25 centres. For age groups 1-5 years, 6-10 years and 11-15 years, the CTDI{sub vol}, DLP and total DLP values were statistically significantly below the values observed in our analogous national survey in adults, although the difference decreased with increasing age. CTDI{sub vol} variability among centres was statistically significant (variance = 0.07; 95% confidence interval = 0.03-0.16; P < 0.001). This study reviewed practice in Italian centres performing paediatric imaging with MDCT scanners. The variability of doses among centres suggests that the use of standardised CT protocols should be encouraged. (orig.)

  17. Pancreatic trauma: The role of computed tomography for guiding therapeutic approach

    Institute of Scientific and Technical Information of China (English)

    Marco; Moschetta; Michele; Telegrafo; Valeria; Malagnino; Laura; Mappa; Amato; A; Stabile; Ianora; Dario; Dabbicco; Antonio; Margari; Giuseppe; Angelelli

    2015-01-01

    AIM: To evaluate the role of computed tomography(CT) for diagnosing traumatic injuries of the pancreas and guiding the therapeutic approach.METHODS: CT exams of 6740 patients admitted to our Emergency Department between May 2005 and January 2013 for abdominal trauma were retrospectively evaluated. Patients were identified through a search of our electronic archive system by using such terms as "pancreatic injury", "pancreatic contusion", "pancreatic laceration", "peri-pancreatic fluid", "pancreatic active bleeding". All CT examinations were performed before and after the intravenous injection of contrast material using a 16-slice multidetector row computed tomography scanner. The data sets were retrospectively analyzed by two radiologists in consensus searching for specific signs of pancreatic injury(parenchymal fracture and laceration, focal or diffuse pancreatic enlargement/edema, pancreatic hematoma, active bleeding, fluid between splenic vein and pancreas) and non-specific signs(inflammatory changes in peri-pancreatic fat and mesentery, fluid surrounding the superior mesentericartery, thickening of the left anterior renal fascia, pancreatic ductal dilatation, acute pseudocyst formation/peri-pancreatic fluid collection, fluid in the anterior and posterior pararenal spaces, fluid in transverse mesocolon and lesser sac, hemorrhage into peri-pancreatic fat, mesocolon and mesentery, extraperitoneal fluid, intraperitoneal fluid).RESULTS: One hundred and thirty-six/Six thousand seven hundred and forty(2%) patients showed CT signs of pancreatic trauma. Eight/one hundred and thirty-six(6%) patients underwent surgical treatment and the pancreatic injures were confirmed in all cases. Only in 6/8 patients treated with surgical approach, pancreatic duct damage was suggested in the radiological reports and surgically confirmed in all cases. In 128/136(94%) patients who underwent non-operative treatment CT images showed pancreatic edema in 97 patients, hematoma in 31 patients

  18. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... CT is less sensitive to patient movement than MRI. CT can be performed if you have an implanted medical device of any kind, unlike MRI. A diagnosis determined by CT scanning may eliminate ...

  19. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... a relatively short time, especially when compared to magnetic resonance imaging (MRI). CT scanning is painless, noninvasive and accurate. A ... CT is less sensitive to patient movement than MRI. CT can be performed if you have an ...

  20. CT colonography for synchronous colorectal lesions in patients with colorectal cancer: initial experience

    Energy Technology Data Exchange (ETDEWEB)

    McArthur, D.R.; Karandikar, S.S. [Heart of England NHS Foundation Trust (Teaching), Department of Surgery, Birmingham (United Kingdom); Mehrzad, H.; Patel, R.; Dadds, J.; Pallan, A.; Roy-Choudhury, S. [Heart of England NHS Foundation Trust (Teaching), Department of Radiology, Birmingham (United Kingdom)

    2010-03-15

    To assess accuracy of CT colonography (CTC) in identifying synchronous lesions in patients with colorectal carcinoma. This study included 174 consecutive patients undergoing CTC as part of staging or primary investigation where a colorectal cancer was diagnosed between 2004 and 2007. Prone unenhanced and portal phase enhanced supine series with air or CO{sub 2} distension were acquired using 4- or 16-slice CT (Toshiba) and read by 2D {+-} 3D formats. Synchronous lesions were classified according to American College of Radiology's (ACR) polyp classification. Segmental gold standard was flexible sigmoidoscopy/colonoscopy within 1 year and/or histology of colonic resection supplemented by follow-up. Nine patients without gold standard were excluded. Sensitivity, specificity and accuracy were calculated on a per polyp, per patient and per segment basis and discrepancies analysed. Direct comparable data were available for 764/990 colonic segments from 165 patients. Of 41 (C2-C4) synchronous lesions on ''gold standard'', 33 were correctly identified on virtual colonoscopy (VC), overall per polyp sensitivity was 80.5%, with detection rates of 20/24 C3 (83.3%) and 3/3 C4 (100%) with per patient and per segment specificity of 95.4% and 99.2%, respectively. CTC is an accurate technique to assess for significant synchronous lesions in patients with colorectal cancer and is applicable for total pre-operative colonic visualisation. (orig.)

  1. 128-slice CT angiography of the aorta without ECG-gating: efficacy of faster gantry rotation time and iterative reconstruction in terms of image quality and radiation dose

    Energy Technology Data Exchange (ETDEWEB)

    Russo, Vincenzo; Garattoni, Monica; Buia, Francesco; Attina, Domenico; Lovato, Luigi; Zompatori, Maurizio [University Hospital ' ' S.Orsola' ' , Cardio-Thoracic-Vascular Department, Cardio-Thoracic Radiology Unit, Bologna (Italy)

    2016-02-15

    To evaluate image quality and radiation dose of non ECG-gated 128-slice CT angiography of the aorta (CTAA) with fast gantry rotation time and iterative reconstruction. Four hundred and eighty patients underwent non ECG-gated CTAA. Qualitative and quantitative image quality assessments were performed. Radiation dose was assessed and compared with the dose of patients who underwent ECG-gated CTAA (n = 126) and the dose of previous CTAA performed with another CT (n = 339). Image quality (aortic root-ascending portion) was average-to-excellent in more than 94 % of cases, without any non-diagnostic scan. For proximal coronaries, image quality was average-to-excellent in more than 50 %, with only 21.5 % of non-diagnostic cases. Quantitative analysis results were also good. Mean radiation dose for thoracic CTAA was 5.6 mSv versus 20.6 mSv of ECG-gated protocol and 20.6 mSv of 16-slice CTAA scans, with an average dose reduction of 72.8 % (p < 0.001). Mean radiation dose for thoracic-abdominal CTAA was 9.7 mSv, versus 20.9 mSv of 16-slice CTAA scans, with an average dose reduction of 53.6 % (p < 0.001). Non ECG-gated 128-slice CTAA is feasible and able to provide high quality visualization of the entire aorta without significant motion artefacts, together with a considerable dose and contrast media volume reduction. (orig.)

  2. 128-slice CT angiography of the aorta without ECG-gating: efficacy of faster gantry rotation time and iterative reconstruction in terms of image quality and radiation dose

    International Nuclear Information System (INIS)

    To evaluate image quality and radiation dose of non ECG-gated 128-slice CT angiography of the aorta (CTAA) with fast gantry rotation time and iterative reconstruction. Four hundred and eighty patients underwent non ECG-gated CTAA. Qualitative and quantitative image quality assessments were performed. Radiation dose was assessed and compared with the dose of patients who underwent ECG-gated CTAA (n = 126) and the dose of previous CTAA performed with another CT (n = 339). Image quality (aortic root-ascending portion) was average-to-excellent in more than 94 % of cases, without any non-diagnostic scan. For proximal coronaries, image quality was average-to-excellent in more than 50 %, with only 21.5 % of non-diagnostic cases. Quantitative analysis results were also good. Mean radiation dose for thoracic CTAA was 5.6 mSv versus 20.6 mSv of ECG-gated protocol and 20.6 mSv of 16-slice CTAA scans, with an average dose reduction of 72.8 % (p < 0.001). Mean radiation dose for thoracic-abdominal CTAA was 9.7 mSv, versus 20.9 mSv of 16-slice CTAA scans, with an average dose reduction of 53.6 % (p < 0.001). Non ECG-gated 128-slice CTAA is feasible and able to provide high quality visualization of the entire aorta without significant motion artefacts, together with a considerable dose and contrast media volume reduction. (orig.)

  3. 多层螺旋CT在心肌桥诊断中的应用及优势%The application and advantages of multi-slice CT in the diagnosis of myocardial bridging

    Institute of Scientific and Technical Information of China (English)

    凌志青; 曾蒙苏; 程伟忠; 饶圣祥; 杨姗; 陈刚

    2008-01-01

    目的 探讨多层螺旋CT(MSCT)在心肌桥中的诊断能力.方法 对51例临床怀疑为冠状动脉粥样硬化性心脏病的患者进行了MSCT、常规冠状动脉造影(CAG)以及血管内超声检查(将后2种检查方法统称为创伤性技术),共82支冠状动脉,其中的80支冠状动脉无明显伪影,可供评价.分别统计MSCT对心肌桥检出的敏感度、特异度和准确度.观察者间的一致件检验采用Cohen Kappa检验方法.结果CAG及血管内超声共发现26例心肌桥,所有心肌桥均发生于左前降支中段附近.MSCT正确检出26例前降支心肌桥巾的23例,其敏感度88%(23/26),特异度96%(52/54),准确度94%(75/80),2名医师对心肌桥的检出Kappa值为0.62.MSCT尚检出2例心肌桥,为创伤性技术所漏诊.将创伤性技术和MSCT综合结果作对照,则MSCT心肌桥检出的敏感度、特异度和准确度分别为89%(25/28)、91%(21/23)和90%(46/51).结论MSCT作为一种无创性成像方法应用于心肌桥的诊断,方法可行,结果可靠.%Objective To investigate the ability of electrocardiogram-gated multislice CT(MSCT)in the diagnosis of myocardial bfidging.Methods Fifty-one patients(82 coronary arteries)with suspected coronary artery disease underwent multi-detector row CT,conventional coronary angiography and intravascular ultrasonography as well.The sensitivity,specificity and accuracy of MSCT for the detection of myocardial bridging were determined.The interobserver agreement was calculated by using Cohen's Kappa test.Results A total of 26 tunneled arteries exclusively located near the middle segment of left anterior descending coronary artery were found by coronary angiography and intravascular uhrasonography.Compared to the invasive methods,MSCT correctly detected 23 of 26 myocardial bridges with a sensitivity of 88%(23/26),specificity of 96%(52/54)and accuracy of 94%(75/80).The Kappa value for overall interobserver variation Was 0.62.Two myocardial bridges diagnosed by MSCT

  4. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... Physician Resources Professions Site Index A-Z Computed Tomography (CT) - Head Computed tomography (CT) of the head uses special x-ray ... What is CT Scanning of the Head? Computed tomography, more commonly known as a CT or CAT ...

  5. MDCT evaluation of congenital mitral-aortic intervalvular fibrosa aneurysm: implications for the aetiology and differential diagnosis

    International Nuclear Information System (INIS)

    Mitral-aortic intervalvular fibrosa aneurysm is a rare disease whose aetiology remains a matter of debate. Here we present the youngest reported patient with the disease, a 6-month-old boy, without a history of infection, which supports a congenital origin as initially proposed. Multidetector-row CT (MDCT) surpassed echocardiography in delineating the intracardiac anatomical details with high spatial resolution, confirming the important problem-solving role of MDCT in the diagnosis of congenital heart disease. (orig.)

  6. 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...

  7. CT coronary angiography in patients with atrial fibrillation

    International Nuclear Information System (INIS)

    Purpose: Reliable visualization of the coronary arteries with multislice spiral CT angiography (MSCTA) in patients with atrial fibrillation (AF) remains a challenge despite retrospective ECG gating. A recently developed new algorithm automatically compensates dynamic changes in the heart rate during the scan, thus reducing misregistration and motion artifacts. The HeartBeat-RT algorithm combines a fixed percent delay determined from the first R wave and the fixed offset delay based on the second R wave in the ECG cycle. The purpose of this study was to find out the optimal reconstruction window in MSCTA in patients with AF for each of the three major coronary arteries during the cardiac cycle. Materials and methods: 20 patients with permanent AF were imaged on a 16-slice scanner (slice collimation: 16 x 0.75 mm; rotation time 0.42 s; 140 kV; 380 mAs; 120 ml Ultravist 370 registered i.v.). The patients had not received any previous drugs for heart frequency regulation. Acquisition was started after bolus tracking of a biphasic bolus of 120 ml Ultravist 370 injected intravenously. Each coronary segment was reconstructed at 0%-90% of the cardiac cycle in increments of 10%. For image analysis we used coronary segments as defined by the American Heart Association. Two blinded independent readers assessed the image quality in terms of visibility and artifacts (five-point rating scale 1=very poor, 2=poor, 3=fair, 4=good and 5=excellent) and the degree of stenosis (five-point rating scale 1=0%, 2=1%-49%, 3=50%-74%, 4=75%-99%, 5=100%) on axial slices, multiplanar reconstructions and three-dimensional volume-rendered images. (orig.)

  8. Application and its clinical significance of 16 row spiral CT enhanced scanning in the diagnosis of pulmonary embolism%16排螺旋CT增强扫描在肺动脉栓塞诊断中的应用及其临床意义

    Institute of Scientific and Technical Information of China (English)

    杨震杰

    2015-01-01

    Objective:To explore the application and its clinical significance of 16 row spiral CT enhanced scanning in the diagnosis of pulmonary embolism.Methods:28 patients with pulmonary embolism were selected from May 2011 to April 2014.They were diagnosed using 16 slice spiral CT enhanced scan.We evaluated the clinical application.Results:By 16 slice spiral CT scan, we could find out the exact location and morphology of pulmonary embolism.Conclusion:The 16 row spiral CT scan can clearly diagnose pulmonary embolism,and timely provide the advantageous basis for treatment,and it has important clinical significance.%目的:探讨16排螺旋CT增强扫描在肺动脉栓塞诊断中的应用及其临床意义.方法:2011年5月-2014年4月收治肺动脉栓塞患者28例,采用16排螺旋CT增强扫描后进行肺动脉栓塞的诊断,并对其在临床上的应用进行评价.结果:经过16排螺旋CT扫描能准确找出肺动脉栓塞发生的部位和形态.结论:采用16排螺旋CT增强扫描能明确诊断肺动脉栓塞的情况,并为治疗提供及时有利的依据,具有重要的临床意义.

  9. Whole-body imaging of oncologic patients using 16-channel PET-CT. Evaluation of an IV contrast enhanced MDCT protocol

    International Nuclear Information System (INIS)

    Aim: this study evaluated a MDCT protocol for contrast-enhanced 16-channel PET-CT with regard to scan range and duration of a whole-body 18F-FDG PET-CT examination, the occurrence of contrast-material induced artefacts and quantitative assessment of CT attenuation. Patients, methods: 205 patients (51.9 ± 12.4 years) with different malignant tumours underwent whole-body PET-CT; the study protocol had been approved by the institutional review board. Contrast-enhanced MDCT (16 x 1.5 mm; 120 ml lomeprol 3 ml/s, 50 ml saline chaser bolus, scan delay 70 s; oral contrast) was also used for attenuation correction. From MDCT data mean scan range and duration, occurrence of contrast media-induced artefacts, and mean CT densities of jugular (jv) and subclavian (scv), superior (vcs) and inferior (vci) caval, portal (pv), and bilateral external iliac veins, pulmonary (ap) and iliac arteries, descending thoracic and abdominal aorta, all cardiac chambers, as well as both liver lobes, spleen, adrenal glands and kidneys were determined. Results: attenuation corrected PET images were free of contrast media-related image artefacts. Homogeneous contrast enhancement was found in the mediastinal veins (right/left jv 171 ± 34/171 ± 35, scv 127 ± 50/127 ± 40, vcs 153 ± 36 HU) and arteries (e.g. ap 145 ± 26/151 ± 26). Cardiac chambers, abdominal vessels (e.g. vci 138 ± 24, pv 159 ± 25 HU), and parenchymal organs revealed sufficient and homogenous contrast-enhancement in all cases. No beam-hardening artefacts occurred in the neighbourhood of the subclavian veins. Conclusion: the chosen whole-body 18F-FDG 16 slice PET-CT protocol allowed for craniocaudal CT scanning with high vessel and parenchymal contrast revealing no IV contrast-media induced artefacts in attenuation-corrected PET data sets. (orig.)

  10. Assessment of multislice CT to quantify pulmonary emphysema function and physiology in a rat model

    Science.gov (United States)

    Cao, Minsong; Stantz, Keith M.; Liang, Yun; Krishnamurthi, Ganapathy; Presson, Robert G., Jr.

    2005-04-01

    Purpose: The purpose of this study is to evaluate multi-slice computed tomography technology to quantify functional and physiologic changes in rats with pulmonary emphysema. Method: Seven rats were scanned using a 16-slice CT (Philips MX8000 IDT) before and after artificial inducement of emphysema. Functional parameters i.e. lung volumes were measured by non-contrast spiral scan during forced breath-hold at inspiration and expiration followed by image segmentation based on attenuation threshold. Dynamic CT imaging was performed immediately following the contrast injection to estimate physiology changes. Pulmonary perfusion, fractional blood volume, and mean transit times (MTTs) were estimated by fitting the time-density curves of contrast material using a compartmental model. Results: The preliminary results indicated that the lung volumes of emphysema rats increased by 3.52+/-1.70mL (plung densities of emphysema rats decreased by 91.76+/-68.11HU (pperfusion for normal and emphysema rats were 0.25+/-0.04ml/s/ml and 0.32+/-0.09ml/s/ml respectively. The fractional blood volumes for normal and emphysema rats were 0.21+/-0.04 and 0.15+/-0.02. There was a trend toward faster MTTs for emphysema rats (0.42+/-0.08s) than normal rats (0.89+/-0.19s) with p<0.006, suggesting that blood flow crossing the capillaries increases as the capillary volume decreases and which may cause the red blood cells to leave the capillaries incompletely saturated with oxygen if the MTTs become too short. Conclusion: Quantitative measurement using CT of structural and functional changes in pulmonary emphysema appears promising for small animals.

  11. Multidetector computed tomography pulmonary angiography in childhood acute pulmonary embolism

    Energy Technology Data Exchange (ETDEWEB)

    Tang, Chun Xiang; Zhang, Long Jiang; Lu, Guang Ming [Medical School of Nanjing University, Department of Medical Imaging, Jinling Hospital, Nanjing, Jiangsu (China); Schoepf, U.J. [Medical School of Nanjing University, Department of Medical Imaging, Jinling Hospital, Nanjing, Jiangsu (China); Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC (United States); Medical University of South Carolina, Department of Pediatrics, Charleston, SC (United States); Chowdhury, Shahryar M. [Medical University of South Carolina, Department of Pediatrics, Charleston, SC (United States); Fox, Mary A. [Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC (United States)

    2015-09-15

    Pulmonary embolism is a life-threatening condition affecting people of all ages. Multidetector row CT pulmonary angiography has improved the imaging of pulmonary embolism in both adults and children and is now regarded as the routine modality for detection of pulmonary embolism. Advanced CT pulmonary angiography techniques developed in recent years, such as dual-energy CT, have been applied as a one-stop modality for pulmonary embolism diagnosis in children, as they can simultaneously provide anatomical and functional information. We discuss CT pulmonary angiography techniques, common and uncommon findings of pulmonary embolism in both conventional and dual-energy CT pulmonary angiography, and radiation dose considerations. (orig.)

  12. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... or DVD. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels. A CT scan of the ...

  13. Computed Tomography (CT) -- Head

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    Full Text Available ... or DVD. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels. CT scanning provides more detailed ...

  14. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... be viewed on a computer monitor, printed on film or transferred to a CD or DVD. CT ... distinguished from one another on an x-ray film or CT electronic image. In a conventional x- ...

  15. Computed Tomography (CT) -- Head

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    Full Text Available ... be viewed on a computer monitor, printed on film or transferred to a CD or DVD. CT ... distinguished from one another on an x-ray film or CT electronic image. In a conventional x- ...

  16. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... air-filled spaces within the bones of the face surrounding the nasal cavity. CT scanning is painless, ... and blood vessels. A CT scan of the face produces images that also show a patient's paranasal ...

  17. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... top of page What are the benefits vs. risks? Benefits A CT scan is one of the ... CT scans should have no immediate side effects. Risks There is always a slight chance of cancer ...

  18. Computed Tomography (CT) -- Head

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    Full Text Available ... top of page What are the benefits vs. risks? Benefits CT scanning is painless, noninvasive and accurate. ... CT scans should have no immediate side effects. Risks There is always a slight chance of cancer ...

  19. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... sinus cavities – hollow, air-filled spaces within the bones of the face surrounding the nasal cavity. CT ... CD or DVD. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater ...

  20. Computed Tomography (CT) -- Head

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    Full Text Available ... Contrast Media and its references. The risk of serious allergic reaction to contrast materials that contain iodine ... of soft tissue (particularly the brain, including the disease processes) are less visible on CT scans . CT ...

  1. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... vessels. CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding ... See the Safety page for more information about pregnancy and x-rays. CT scanning is, in general, ...

  2. Computed Tomography (CT) -- Head

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    Full Text Available ... CT Angiography page . top of page How should I prepare? You should wear comfortable, loose-fitting clothing ... within 10 minutes. top of page What will I experience during and after the procedure? CT exams ...

  3. Computed Tomography (CT) -- Head

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    Full Text Available ... view of the body's interior. Refinements in detector technology allow nearly all CT scanners to obtain multiple ... scanning is painless, noninvasive and accurate. A major advantage of CT is its ability to image bone, ...

  4. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... view of the body's interior. Refinements in detector technology allow nearly all CT scanners to obtain multiple ... scanning is painless, noninvasive and accurate. A major advantage of CT is its ability to image bone, ...

  5. Computed Tomography (CT) -- Head

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    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... many types of tissue as well as the lungs, bones, and blood vessels. CT examinations are fast ...

  6. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... many types of tissue as well as the lungs, bones, and blood vessels. CT examinations are fast ...

  7. CT angiography and CT perfusion in acute ischemic stroke

    NARCIS (Netherlands)

    Seeters, T. van

    2016-01-01

    CT angiography and CT perfusion are used in patients with acute ischemic stroke for diagnostic purposes and to select patients for treatment. In this thesis, the reproducibility of CT angiography and CT perfusion is examined, the additional value of CT angiography and CT perfusion for stroke outcome

  8. CT Colonography (Virtual Colonoscopy)

    Science.gov (United States)

    ... how do I get them? What are the benefits vs. risks? What are the limitations of CT Colonography? What is CT Colonography? Computed tomography, more commonly known as a CT or CAT scan, is a diagnostic medical test that, like traditional ...

  9. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives. CT has been shown to be a cost-effective imaging tool for a wide range of clinical problems. CT is less sensitive to patient movement ...

  10. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives. CT has been shown to be a cost-effective imaging tool for a wide range of clinical problems. CT is less sensitive to patient movement ...

  11. Marketing cardiac CT programs.

    Science.gov (United States)

    Scott, Jason

    2010-01-01

    There are two components of cardiac CT discussed in this article: coronary artery calcium scoring (CACS) and coronary computed tomography angiography (CCTA).The distinctive advantages of each CT examination are outlined. In order to ensure a successful cardiac CT program, it is imperative that imaging facilities market their cardiac CT practices effectively in order to gain a competitive advantage in this valuable market share. If patients receive quality care by competent individuals, they are more likely to recommend the facility's cardiac CT program. Satisfied patients will also be more willing to come back for any further testing.

  12. Recognition of fibrous dysplasia of bone mimicking skeletal metastasis on 18F-FDG PET/CT imaging

    International Nuclear Information System (INIS)

    Fibrous dysplasia of bone (FDB) reveals intense 18F-FDG uptake mimicking metastases on 18F-FDG PET/CT. We reviewed sites of FDB revealed by 18F-FDG PET/CT imaging to allow identification of this abnormality. Eleven patients (7 male, 4 female, aged 16-78 years) were evaluated after 55 MBq (0.15 mCi)/kg 18F-FDG utilizing a 16-slice multiple detector CT (MDCT) whole-body PET scanner, with LOR algorithm 3D reconstruction. One- and 2-h imaging was performed in 9 patients. Standard uptake value (SUV) for each lesion, on early and delayed imaging, was calculated. Lesions were confirmed in 6 patients by biopsy. The PET images correlated with MDCT to establish the imaging characteristics. Solitary lesions were found in 4 patients, two lesions in 1 patient, and in 6 patients there were multiple bone lesions. The SUVearly ranged from 1.23 to 9.64 with an average of 3.76 ± 2.40. The SUVdelayed ranged from 1.76 to 11.42 with an average of 4.51 ± 3.07. The SUVdelayed decreased or increased slightly (-31% to 5%) in 6 of our patients, and increased significantly (11% to 39%) in 3. There was a negative correlation between SUVs and age, as well as the number of affected bones. In our study, FDB had wide skeletal distribution with variability of 18F-FDG uptake and CT appearance. SUV in the delayed stage was seen to either decrease or increase on dual-time 18F-FDG PET scanning. It is very important to recognize the characteristics of this skeletal dysplasia to allow differentiation from skeletal metastasis. (orig.)

  13. The Use of CT Perfusion to Determine Microvessel Density in Lung Cancer: Comparison with FDG-PET and Pathology

    Institute of Scientific and Technical Information of China (English)

    Ning Xing; Zu-long Cai; Shao-hong Zhao; Li Yang; Bai-xuan Xu; Fu-lin Wang

    2011-01-01

    Objective: To investigate the validity of CT perfusion in assessing angiogenic activity of lung cancer. Methods: Fifty-six patients with lung cancer scheduled for elective surgical resection received 16-slice helical CT perfusion imaging. Time-density curve (TDC), blood flow (BF), blood volume (BV), mean transmit time (MTT) and permeability surface area product (PS) were calculated. 18F-deoxyglucose-positron emission tomography (FGD-PET)was carried out in 14 out of the 56 patients to calculate standardized uptake values (SUVs). Tumor microvessel density (MVD) was examined using CD34 immunohistochemical staining of the resected tumor tissue. Pearson's correlation analysis was used to evaluate potential correlation between CT perfusion parameters and MVD or SUV. Results: Average time to peak height (TPH) of the TDCs (including two types of TDC) was 24.38±5.69 seconds.Average BF, BV, MTT and PS were 93.42±53.45 ml/100g/min, 93.42±53.45 ml/100g, 6.83±4.51 s and 31.92±18.73ml/100g/rnin, respectively. Average MVD was 62.04±29.06/HPF. The mean SUV was 6.33±3.26. BF was positively correlated with MVD (r=0.620, P<0.01) and SUV (r=0.891, P<O.01). PS was also positively correlated with SUV (r=0.720, P<0.05). A positive correlation was also observed between tumor MVD and SUV (r=0.915, P<0.01). Conclusions: CT perfusion imaging is a reliable tool to evaluate the tumor neovascularity of lung cancer.

  14. 下腔静脉病变的 CT 与 MRI 诊断价值%Study on the significance of CT scanning and MRI in diagnosis of lesions in inferior vena cava

    Institute of Scientific and Technical Information of China (English)

    王文生; 丁长青; 孙迎迎; 罗慧; 代兰兰; 丁爱兰

    2014-01-01

    Objective To explore the significance of multi - slice spiral CT scanning and MRI in diagnosis of lesions in inferior vena cava (IVC). Methods The data of 16 - slice spiral CT scanning and 0. 35T MRI imaging of 80 patients with clinically confirmed IVC lesions were retrospectively analyzed. The CT scanning was given with multi - phase contrast - enhanced examination,MRI was mainly by plain scanning. These examinations were focused on analyzing the scope and nature of inferior vena cava. Results Among these 80 cases,9 cases were congenital malformation of IVC(5 cases were diagnosed by CT scanning,and 4 cases by MRI),formation of emboli in 36 cases(including 5 with thrombo-sis,31 with cancer embolus;32 cases were diagnosed by CT,and 4 cases by MRI ),16 cases of Budd Chiari syndrome(diagnosed by CT scan-ning in 15 cases,MRI in 1 case),stenosis caused by external pressure in 12 cases(diagnosed by CT scanning in 8 cases,and by MRI in 4 ca-ses),placement of stent in 3 cases(diagnosed by CT scanning). Conclusion Multi - slice spiral CT scanning and MRI can rapidly,accurately and non - invasively demonstrate IVC and its lesions,hence they are worthy to be applied for clinical diagnosis.%目的:探讨多层螺旋 CT 及 MRI 在下腔静脉病变中的诊断价值。方法回顾性分析临床证实的80例下腔静脉病变的16层螺旋 CT 及0.35T MRI 资料,CT 以多期增强检查为主,MRI 以平扫为主。重点分析下腔静脉病变部位、范围及性质。结果检出下腔静脉先天畸形9例(其中 CT 诊断5例,MRI 诊断4例),下腔静脉栓子形成36例(其中血栓5例,癌栓31例;CT 诊断32例,MRI 诊断4例),布加综合征16例(其中 CT 诊断15例,MRI 诊断1例),外压性狭窄12例(其中 CT 诊断8例,MRI 诊断4例),支架置入3例(均为 CT 诊断)。结论多层螺旋 CT 及 MRI 能够快速、无创较为准确显示下腔静脉及其病变,值得临床应用。

  15. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... Site Index A-Z Children's (Pediatric) CT (Computed Tomography) Pediatric computed tomography (CT) is a fast, painless exam that uses ... of Children's CT? What is Children's CT? Computed tomography, more commonly known as a CT or CAT ...

  16. The correlation between periodontal diseases and carotid arteries atherosclerosis by three-dimensional reconstruction technique of multi-slice spiral CT in elderly people%三维CT成像评价老年人牙齿残缺与颈动脉粥样硬化的关系

    Institute of Scientific and Technical Information of China (English)

    王瑾; 刘海霞; 孙静华; 付英杰

    2013-01-01

    目的 探讨三维CT成像技术显示牙齿残缺的临床应用价值,并通过三维CT成像评价老年人牙齿残缺与颈动脉粥样硬化的关系. 方法 从年龄大于60岁的三维CT血管造影检查者中随机选择60例颈部动脉粥样硬化患者为病例组,颈部动脉正常者60例为对照组,采用多种图像后处理技术,分别观察两组牙齿残缺情况和颈部动脉情况. 结果 病例组患龋人数、缺齿人数、无牙颌人数均多于对照组(P<0.05).牙齿完整人数对照组(19例)高于病例组(7例),患龋者病组(7.3±3.0)颗高于对照组(6.0±2.1)颗,缺齿者均数病例组(45例)高于对照组(39例)(P<0.05);牙齿疾患与颈动脉粥样硬化疾病相关,三维CT成像技术观察颌骨牙齿情况,可以全面展示牙齿立体形态和内部结构,为牙周疾病提供有价值的资料. 结论 老年人龋齿、牙缺失与动脉粥样硬化密切相关.三维CT成像技术可为研究外周血管疾病与牙周疾病提供有价值的方法.%Objective To explore the possible correlation between periodontal disease and carotid arteries atherosclerosis in old people,and to study the diagnostic value for periodontal disease using three-dimensional (3D) reconstruction technique of multi-slice spiral CT (MSCT).Methods Patients underwent multi-detector row CT angiography with carotid arteries atherosclerosis (control group) and without carotid arteries atherosclerosis (case group) were evaluated with the stereoscopic configuration of teeth,and the number of decayed teeth and lost teeth were recorded.Results Bythe 3D reconstruction technique,the number of decayed teeth and lost teeth between two groups were significantly different (P<0.05).The number of dental integrity patients was higher in control group (19 cases) than in case group(7 cases).The mean of dental caries was higher in control group(7.3±3.0) than in case group(6.0±2.1).The mean of hypodontia was higher in control group(45 cases) than

  17. Knee CT scan

    Science.gov (United States)

    Risks of CT scans include: Exposure to radiation Allergy to contrast dye CT scans give off more radiation than ... injected contrast dye. The most common type of contrast contains ... you have this an iodine allergy. If you need to have this kind of ...

  18. Computed Tomography (CT) -- Head

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    Full Text Available ... image recording plate. Bones appear white on the x-ray; soft tissue, such as organs like the heart or ... of CT is its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many ...

  19. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... image recording plate. Bones appear white on the x-ray; soft tissue, such as organs like the heart or ... of CT is its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many ...

  20. Computed Tomography (CT) -- Head

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    Full Text Available ... detailed images of many types of tissue as well as the lungs, bones, and blood vessels. CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives. CT has been shown to be a cost-effective imaging tool for a wide ...

  1. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... detailed images of many types of tissue as well as the lungs, bones, and blood vessels. CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives. CT has been shown to be a cost-effective imaging tool for a wide ...

  2. CT of Gastric Emergencies.

    Science.gov (United States)

    Guniganti, Preethi; Bradenham, Courtney H; Raptis, Constantine; Menias, Christine O; Mellnick, Vincent M

    2015-01-01

    Abdominal pain, nausea, and vomiting are common presenting symptoms among adult patients seeking care in the emergency department, and, with the increased use of computed tomography (CT) to image patients with these complaints, radiologists will more frequently encounter a variety of emergent gastric pathologic conditions on CT studies. Familiarity with the CT appearance of emergent gastric conditions is important, as the clinical presentation is often nonspecific and the radiologist may be the first to recognize gastric disease as the cause of a patient's symptoms. Although endoscopy and barium fluoroscopy remain important tools for evaluating patients with suspected gastric disease in the outpatient setting, compared with CT these modalities enable less comprehensive evaluation of patients with nonspecific complaints and are less readily available in the acute setting. Endoscopy is also more invasive than CT and has greater potential risks. Although the mucosal detail of CT is relatively poor compared with barium fluoroscopy or endoscopy, CT can be used with the appropriate imaging protocols to identify inflammatory conditions of the stomach ranging from gastritis to peptic ulcer disease. In addition, CT can readily demonstrate the various complications of gastric disease, including perforation, obstruction, and hemorrhage, which may direct further clinical, endoscopic, or surgical management. We will review the normal anatomy of the stomach and discuss emergent gastric disease with a focus on the usual clinical presentation, typical imaging appearance, and differentiating features, as well as potential imaging pitfalls.

  3. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... CT is less sensitive to patient movement than MRI. CT can be performed if you have an implanted medical device of any kind, unlike MRI. CT imaging provides real-time imaging, making it ...

  4. CT of tracheal agenesis

    International Nuclear Information System (INIS)

    Tracheal agenesis is a rare and usually lethal anomaly. In the past, opaque contrast medium was injected via the esophagus to demonstrate the anatomy. To demonstrate the utility of helical and multidetector CT in delineating the aberrant anatomy in newborns with tracheal agenesis. Four newborns with tracheal agenesis were identified from three institutions. Imaging studies and medical records were reviewed. Each child was imaged with chest radiography. One child was imaged on a single-detector helical CT scanner and the other three on multidetector scanners. Helical and multidetector CT with 2D and 3D reconstructions clearly delineated the aberrant tracheobronchial and esophageal anatomy in each infant. Minimum intensity projection reformatted CT images were particularly helpful. One infant each had type I and type II tracheal agenesis. Two infants had type III tracheal agenesis. All four infants died. CT is a useful tool for delineating the aberrant anatomy of newborns with tracheal agenesis and thus helps in making rational clinical decisions. (orig.)

  5. CT of tracheal agenesis

    Energy Technology Data Exchange (ETDEWEB)

    Strouse, Peter J.; Hernandez, Ramiro J. [C.S. Mott Children' s Hospital, Department of Radiology, Ann Arbor, MI (United States); Newman, Beverley [Children' s Hospital of Pittsburgh, PA (United States). Department of Pediatric Radiology; Afshani, Ehsan [Children' s Hospital of Buffalo, NY (United States). Departments of Radiology and Pediatrics; Bommaraju, Mahesh [Women' s and Children' s Hospital of Buffalo, Division of Neonatology, University Pediatrics Associates, Buffalo, NY (United States)

    2006-09-15

    Tracheal agenesis is a rare and usually lethal anomaly. In the past, opaque contrast medium was injected via the esophagus to demonstrate the anatomy. To demonstrate the utility of helical and multidetector CT in delineating the aberrant anatomy in newborns with tracheal agenesis. Four newborns with tracheal agenesis were identified from three institutions. Imaging studies and medical records were reviewed. Each child was imaged with chest radiography. One child was imaged on a single-detector helical CT scanner and the other three on multidetector scanners. Helical and multidetector CT with 2D and 3D reconstructions clearly delineated the aberrant tracheobronchial and esophageal anatomy in each infant. Minimum intensity projection reformatted CT images were particularly helpful. One infant each had type I and type II tracheal agenesis. Two infants had type III tracheal agenesis. All four infants died. CT is a useful tool for delineating the aberrant anatomy of newborns with tracheal agenesis and thus helps in making rational clinical decisions. (orig.)

  6. 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)

  7. Phantom-based evaluations of two binning algorithms for four-dimensional CT reconstruction in lung cancer radiation therapy

    Institute of Scientific and Technical Information of China (English)

    Fuli Zhang; Huayong Jiang; Weidong Xu; Yadi Wang ; Qingzhi Liu; Na Lu; Diandian Chen; Bo Yao

    2014-01-01

    Objective: The purpose of this study was to evaluate the performance of the phase-binning algorithm and am-plitude-binning algorithm for four-dimensional computed tomography (4DCT) reconstruction in lung cancer radiation therapy. Methods: Quasar phantom data were used for evaluation.Aphantom of known geometry was mounted on a four-dimensional (4D) motion platform programmed with twelve respiratory waves (twelve lung patients trajectories) and scanned with a Philips Bril iance Big bore 16-slice CT simulator. The 4DCT images were reconstructed using both phase- and amplitude-binning algorithms. Internal target volumes (ITVs) of the phase- and amplitude-binned image sets were compared by evaluation of shape and volume distortions. Results: The phantom experiments il ustrated that, as expected, maximum inhalation occurred at the 0% amplitude and maximum exhalation occurred at the 50% amplitude of the amplitude-binned 4DCT image sets. The amplitude-binned algorithm rendered smal er ITV than the phase-binning algorithm. Conclusion: The amplitude-binning algorithm for 4DCT reconstruction may have a potential advantage in reducing the margin and protecting normal lung tissue from unnecessary irradiation.

  8. Clinical evaluation of a commercial orthopedic metal artifact reduction tool for CT simulations in radiation therapy

    Energy Technology Data Exchange (ETDEWEB)

    Li Hua; Noel, Camille; Chen, Haijian; Harold Li, H.; Low, Daniel; Moore, Kevin; Klahr, Paul; Michalski, Jeff; Gay, Hiram A.; Thorstad, Wade; Mutic, Sasa [Department of Radiation Oncology, Washington University, St. Louis, Missouri 63110 (United States); Department of Radiation Oncology, University of California Los Angeles, Los Angeles, California 90095 (United States); Department of Radiation Oncology, University of California San Diego, San Diego, California 92093 (United States); Philips Healthcare System, Cleveland, Ohio 44143 (United States); Department of Radiation Oncology, Washington University, St. Louis, Missouri 63110 (United States)

    2012-12-15

    Purpose: Severe artifacts in kilovoltage-CT simulation images caused by large metallic implants can significantly degrade the conspicuity and apparent CT Hounsfield number of targets and anatomic structures, jeopardize the confidence of anatomical segmentation, and introduce inaccuracies into the radiation therapy treatment planning process. This study evaluated the performance of the first commercial orthopedic metal artifact reduction function (O-MAR) for radiation therapy, and investigated its clinical applications in treatment planning. Methods: Both phantom and clinical data were used for the evaluation. The CIRS electron density phantom with known physical (and electron) density plugs and removable titanium implants was scanned on a Philips Brilliance Big Bore 16-slice CT simulator. The CT Hounsfield numbers of density plugs on both uncorrected and O-MAR corrected images were compared. Treatment planning accuracy was evaluated by comparing simulated dose distributions computed using the true density images, uncorrected images, and O-MAR corrected images. Ten CT image sets of patients with large hip implants were processed with the O-MAR function and evaluated by two radiation oncologists using a five-point score for overall image quality, anatomical conspicuity, and CT Hounsfield number accuracy. By utilizing the same structure contours delineated from the O-MAR corrected images, clinical IMRT treatment plans for five patients were computed on the uncorrected and O-MAR corrected images, respectively, and compared. Results: Results of the phantom study indicated that CT Hounsfield number accuracy and noise were improved on the O-MAR corrected images, especially for images with bilateral metal implants. The {gamma} pass rates of the simulated dose distributions computed on the uncorrected and O-MAR corrected images referenced to those of the true densities were higher than 99.9% (even when using 1% and 3 mm distance-to-agreement criterion), suggesting that dose

  9. CT in alveolar proteinosis

    International Nuclear Information System (INIS)

    Nine patients with pulmonary alveolar proteinosis (PAP) were scanned with CT. Results were not specific for PAP but may be help0ful in the differential diagnosis is visualization of pulmonary vessels is maintained and air bronchograms are scarce in diseased areas. CT is better than conventional radiography in identifying infectious complications and evaluating disease extent and may help in deciding whether or not therapeutic lavage is indicated. CT has also identified an interstitial component of PAP that correlates histologically with an inflammatory cell infiltrate. The cellular infiltrate may play a role in the development of the interstitial fibrosis seen in some cases of PAP

  10. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... the best way to see if treatment is working or if an abnormality is stable or changed ...

  11. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... the best way to see if treatment is working or if an abnormality is stable or changed ...

  12. Computed Tomography (CT) -- Head

    Science.gov (United States)

    ... the head is typically used to detect: bleeding, brain injury and skull fractures in patients with head injuries. ... medically necessary because of potential risk to the baby. This risk is, however, minimal with head CT ...

  13. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... up in shades of gray, and air appears black. With CT scanning, numerous x-ray beams and ... be removed by the technologist, and the tiny hole made by the needle will be covered with ...

  14. Computed Tomography (CT) -- Head

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    Full Text Available ... up in shades of gray, and air appears black. With CT scanning, numerous x-ray beams and ... be removed by the technologist, and the tiny hole made by the needle will be covered with ...

  15. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... resulting in more detail and additional view capabilities. Modern CT scanners are so fast that they can ... the scanning. Any motion, whether breathing or body movements, can lead to artifacts on the images. This ...

  16. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... resulting in more detail and additional view capabilities. Modern CT scanners are so fast that they can ... the scanning. Any motion, whether breathing or body movements, can lead to artifacts on the images. This ...

  17. Computed Tomography (CT) -- Head

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    Full Text Available ... Videos related to Computed Tomography (CT) - Head About this Site RadiologyInfo.org is produced by: Please note ... you can search the ACR-accredited facilities database . This website does not provide cost information. The costs ...

  18. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... Images related to Computed Tomography (CT) - Sinuses About this Site RadiologyInfo.org is produced by: Please note ... you can search the ACR-accredited facilities database . This website does not provide cost information. The costs ...

  19. Computed Tomography (CT) -- Head

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    Full Text Available ... See the Safety page for more information about pregnancy and x-rays. top of page What does ... See the Safety page for more information about pregnancy and x-rays. CT scanning is, in general, ...

  20. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... See the Safety page for more information about pregnancy and x-rays. top of page What does ... See the Safety page for more information about pregnancy and x-rays. CT scanning is, in general, ...

  1. CT head in children

    Energy Technology Data Exchange (ETDEWEB)

    Rao, Padma, E-mail: padma.rao@rch.org.au [Royal Children' s Hospital and the University of Melbourne, Medical Imaging Department, Flemington Road, Parkville, Melbourne, Victoria 3052 (Australia); Bekhit, Elhamy, E-mail: elhamy.bekhit@rch.org.au [Royal Children' s Hospital and the University of Melbourne, Medical Imaging Department, Flemington Road, Parkville, Melbourne, Victoria 3052 (Australia); Ramanauskas, Fiona, E-mail: fiona.ramanauskas@rch.org.au [Royal Children' s Hospital and the University of Melbourne, Medical Imaging Department, Flemington Road, Parkville, Melbourne, Victoria 3052 (Australia); Kumbla, Surekha, E-mail: surekha.kumbla@rch.org.au [Royal Children' s Hospital and the University of Melbourne, Medical Imaging Department, Flemington Road, Parkville, Melbourne, Victoria 3052 (Australia)

    2013-07-15

    The advances in computerized technology (CT) technique over the last few decades have greatly modified imaging protocols in children. The range of pathologies that can now be demonstrated has broadened with the advent of newer techniques such as CT perfusion and the ability to perform complex reconstructions. Increasing speed of scanning and reduction in scan time have influenced the need for sedation and general anaesthetic as well as impacting on motion artefact. Additionally, concerns about radiation safety and avoidance of unnecessary radiation have further impacted on the inclusion of CT in the imaging armamentarium. Justification and image optimisation are essential. It is important to familiarize oneself with the appearances of normal variants or age related developmental changes. CT does however remain an appropriate investigation in a number of conditions.

  2. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... artifacts on the images. This loss of image quality can resemble the blurring seen on a photograph ... verifies that the images are of high enough quality for accurate interpretation. The actual CT scan takes ...

  3. Pediatric CT Scans

    Science.gov (United States)

    The Radiation Epidemiology Branch and collaborators have initiated a retrospective cohort study to evaluate the relationship between radiation exposure from CT scans conducted during childhood and adolescence and the subsequent development of cancer.

  4. CT urography and hematuria

    DEFF Research Database (Denmark)

    Bretlau, Thomas; Hansen, Rasmus H; Thomsen, Henrik S

    2015-01-01

    BACKGROUND: Computed tomography (CT) urography is now used in the work-up of patients with hematuria. The dose of contrast medium and radiation varies considerably between the different CT protocols. PURPOSE: To study the disease prevalence in a consecutive group of patients with hematuria...... undergoing CT urography with a low dose of contrast medium and radiation. MATERIAL AND METHODS: From 1 April 2007 to 31 March 2008, using the Radiological Information System (RIS) as well as electronic patient records, demographic data, reason for referral, and diagnosis were obtained for all patients...... undergoing CT urography due to hematuria. The patients were followed for 3 years. RESULTS: A total of 771 patients had hematuria diagnosed at the time of referral. In 137 patients (18%), a tumor and / or a complex cyst was found in the urinary tract (renal, ureteral, or bladder), in 68 (9%) a calculi, in 118...

  5. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... CT exam to be stressful. The technologist or nurse, under the direction of a physician, may offer ... and send an official report to your primary care physician or physician who referred you for the ...

  6. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... visibility of certain tissues or blood vessels. A nurse or technologist will insert an intravenous (IV) line ... CT exam to be stressful. The technologist or nurse, under the direction of a physician, may offer ...

  7. Computed Tomography (CT) -- Head

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    Full Text Available ... CD or DVD. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater ... is also performed to: evaluate the extent of bone and soft tissue damage in patients with facial ...

  8. Computed Tomography (CT) -- Head

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    Full Text Available ... seconds, and even faster in small children. Such speed is beneficial for all patients but especially children, ... When you enter the CT scanner room, special light lines may be seen projected onto your body, ...

  9. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... seconds, and even faster in small children. Such speed is beneficial for all patients but especially children, ... When you enter the CT scanner room, special light lines may be seen projected onto your body, ...

  10. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many types of tissue as well as the lungs, bones, ...

  11. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many types of tissue as well as the lungs, bones, ...

  12. Computed Tomography (CT) -- Head

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    Full Text Available ... hours prior to your exam. Leave jewelry at home and wear loose, comfortable clothing. You may be ... the CT images and should be left at home or removed prior to your exam. You may ...

  13. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... hours prior to your exam. Leave jewelry at home and wear loose, comfortable clothing. You may be ... the CT images and should be left at home or removed prior to your exam. You may ...

  14. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... you are pregnant and discuss any recent illnesses, medical conditions, medications you’re taking, and allergies. You ... a CT or CAT scan, is a diagnostic medical test that, like traditional x-rays, produces multiple ...

  15. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... you are pregnant and discuss any recent illnesses, medical conditions, medications you’re taking, and allergies. You ... a CT or CAT scan, is a diagnostic medical test that, like traditional x-rays, produces multiple ...

  16. Computed Tomography (CT) -- Head

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    Full Text Available ... to plan radiation therapy for brain cancer. In emergency cases, it can reveal internal injuries and bleeding ... vessels. CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding ...

  17. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... that are filled with fluid or thickened sinus membranes . detect the presence of inflammatory diseases. provide additional ... view of the body's interior. Refinements in detector technology allow nearly all CT scanners to obtain multiple ...

  18. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... by defining anatomy. top of page How should I prepare? You should wear comfortable, loose-fitting clothing ... within 10 minutes. top of page What will I experience during and after the procedure? CT exams ...

  19. Computed Tomography (CT) -- Head

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    Full Text Available ... look like? The CT scanner is typically a large, box-like machine with a hole, or short ... spiral path. A special computer program processes this large volume of data to create two-dimensional cross- ...

  20. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... look like? The CT scanner is typically a large, box-like machine with a hole, or short ... spiral path. A special computer program processes this large volume of data to create two-dimensional cross- ...

  1. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... vessels. CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding ... About Us | Contact Us | FAQ | Privacy | Terms of Use | Links | Site Map Copyright © 2016 Radiological Society of ...

  2. Computed Tomography (CT) -- Sinuses

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    Full Text Available Toggle navigation Test/Treatment Patient Type Screening/Wellness Disease/Condition Safety En Español More Info Images/Videos News Physician Resources Professions Site Index A-Z Computed Tomography (CT) - Sinuses ...

  3. Computed Tomography (CT) -- Head

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    Full Text Available Toggle navigation Test/Treatment Patient Type Screening/Wellness Disease/Condition Safety En Español More Info Images/Videos News Physician Resources Professions Site Index A-Z Computed Tomography (CT) - Head ...

  4. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... over time. top of page What are the benefits vs. risks? Benefits A CT scan is one of the safest ... cancer from excessive exposure to radiation. However, the benefit of an accurate diagnosis far outweighs the risk. ...

  5. Computed Tomography (CT) -- Head

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    Full Text Available ... over time. top of page What are the benefits vs. risks? Benefits CT scanning is painless, noninvasive and accurate. A ... cancer from excessive exposure to radiation. However, the benefit of an accurate diagnosis far outweighs the risk. ...

  6. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... over time. top of page What are the benefits vs. risks? Benefits A CT scan is one of the safest ... the possible charges you will incur. Web page review process: This Web page is reviewed regularly by ...

  7. Computed Tomography (CT) -- Head

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    Full Text Available ... over time. top of page What are the benefits vs. risks? Benefits CT scanning is painless, noninvasive and accurate. A ... the possible charges you will incur. Web page review process: This Web page is reviewed regularly by ...

  8. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... during the procedure. Metal objects, including jewelry, eyeglasses, dentures and hairpins, may affect the CT images and ... for? Yes No To submit a comment, please complete the following form: Comment: E-mail: Area code: ...

  9. Computed Tomography (CT) -- Head

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    Full Text Available ... during the procedure. Metal objects, including jewelry, eyeglasses, dentures and hairpins, may affect the CT images and ... for? Yes No To submit a comment, please complete the following form: Comment: E-mail: Area code: ...

  10. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... a relatively short time, especially when compared to magnetic resonance imaging (MRI). CT scanning is painless, noninvasive and ... the extent of soft tissue of the tumor, magnetic resonance imaging (MRI) may be helpful. A person who ...

  11. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... have special pediatric considerations. The teddy bear denotes child-specific content. Related Articles and Media Magnetic Resonance Imaging (MRI) - Head Head and Neck Cancer Treatment Radiation Dose in X-Ray and CT ...

  12. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... a few seconds, and even faster in small children. Such speed is beneficial for all patients but ...

  13. Computed Tomography (CT) -- Head

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    Full Text Available ... microphone. top of page How does the procedure work? In many ways CT scanning works very much ... a few seconds, and even faster in small children. Such speed is beneficial for all patients but ...

  14. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... will analyze the images and send an official report to your primary care physician or physician who ... can be performed if you have an implanted medical device of any kind, unlike MRI. CT imaging ...

  15. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... many types of tissue as well as the lungs, bones, and blood vessels. CT examinations are fast ... of many areas of the body, particularly the lungs, abdomen, pelvis and bones. A diagnosis determined by ...

  16. Computed Tomography (CT) -- Head

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    Full Text Available ... pictures of the inside of the body. The cross-sectional images generated during a CT scan can ... large volume of data to create two-dimensional cross-sectional images of your body, which are then ...

  17. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... pictures of the inside of the body. The cross-sectional images generated during a CT scan can ... large volume of data to create two-dimensional cross-sectional images of your body, which are then ...

  18. Computed Tomography (CT) -- Sinuses

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    Full Text Available ... cavity. CT scanning is painless, noninvasive and accurate. It’s also the most reliable imaging technique for determining ... parts absorb the x-rays in varying degrees. It is this crucial difference in absorption that allows ...

  19. CT number definition

    International Nuclear Information System (INIS)

    The accuracy of CT number plots has been found lacking in several medical applications. This is of concern since the ability to compare and evaluate results on a reproducible and standard basis is essential to long term development. Apart from the technical limitations arising from the CT scanner and the data treatment, there are fundamental issues with the definition of the Hounsfield number, namely the absence of a standard photon energy and the need to specify the attenuation mechanism for standard measurements. This paper presents calculations to demonstrate the shortcomings of the present definition with a brief discussion. The remedy is straightforward, but probably of long duration as it would require an international agreement. - Highlights: ► The dependence of the CT number definition on photon energy is examined. ► Graphical examples of the CT number variation with photon energy are given. ► The influence of absorption edges and scattering on CT numbers is discussed. ► A proposal is made for an international standard devoted to CT number evaluation.

  20. CT-Urography

    International Nuclear Information System (INIS)

    In this paper we present an overview of CT-Urography. With the advent of multislice CT scanners and the evolution of image processing methods this technique now affords optimal urographic images comparable to those obtained with conventional techniques. We describe the acquisition techniques and protocols used by the various authors. Effective radiation dose has conditioned the use of CT-Urography so that the tendency today is to reduce the number of scans by performing, after the non enhanced scan, a single contrast-enhanced scan comprising both the nephrographic and urographic phase. With the use of multislice CT the quality of the urogram improves with the number of slices. We illustrate a variety of processing techniques, multiplanar reconstruction (MPR), maximum (MIP) and average intensity projection (AIP) and volume rendering (VR) and present a series of upper urinary tract tumours testifying to the superiority of the AIP technique over MIP. We then review the results of comparative studies of CT-Urography with conventional urography in upper urinary tract diagnostics. Finally, we describe the advantages and limitations of CT-Urography

  1. 16层螺旋CT多期增强扫描对小肝癌的诊断研究%Contrast-enhanced 16 multi-slice spiral CT scans for the diagnosis of small hepatocellular carcinoma

    Institute of Scientific and Technical Information of China (English)

    郭敬深; 夏广明; 罗剑云; 陈锦灿

    2011-01-01

    目的 研究小肝癌(SHCC)在16层螺旋CT( SCT)多期(动脉期、门脉期和延迟期)增强扫描的表现特征,提高小肝癌的诊断水平及评价其应用价值。方法 收集53例SHCC进行回顾性分析,所有病例均行16层螺旋CT多期增强扫描,扫描时间分别为动脉期34~40s、门脉期65~80s、延迟期4~6 min,用高压注射器经静脉注射,速率为2.5~3 ml/s,剂量为85~95 ml,观察SHCC在各期的强化方式。结果 共发现70个病灶,平扫、动脉期、门脉期和延迟期的检出率分别为70.0%、97.1%、82.9%和87.1%,动脉期的敏感性高于门脉期和延迟期。结论 16层螺旋CT多期增强扫描能充分反映SHCC在增强中的血供变化特点,提高了SHCC的检出率及定性诊断的准确性。%Objective To improve the diagnostic level for small hepatocellular carcinoma ( SHCC )by exploring the characteristic appearance of SHCC on constract-enhanced 16-slice spiral CT multi-phase ( arterial, portal venous phase, and delayed phase ) scans. Methods The data on 53 patients with SHCC were retrospectively analyzed. All the patients received 16-slice spiral CT multi-phase scans, with scanning time of 34-40s at arterial phase, 65-80s at portal venous phase, and 4-6min at delayed phase. The constract of 85-95ml was intravenously injected at a velocity of 2.5-3 ml/s with a high pressure syringe. The enhancement patterns of SHCC were observed at different phases. Results 75lesions were found. The detection rate was 70.0% for plain scan, 97.1% for arterial phase, 82.9% for portal phase, and 87.1% for delayed phase, with a sensitivity higher in arterial phase than in portal phase and delayed phase. Conclusions Contrast-enhanced 16-slice spiral CT scans can fully reflect the enhancing characteristics of blood supply in SHCC, improving the detection rate and the accuracy of diagnosis.

  2. Bronchial asthma: correlation of quantitative CT and the pulmonary function test

    Energy Technology Data Exchange (ETDEWEB)

    Park, Gun; Jin, Gong Yong; Jeon, Su Bin; Han, Young Min [Chonbuk National University Hospital, Research Institute of Clinical Medicine, Jeonju (Korea, Republic of)

    2007-02-15

    The purpose of this study was to assess the availability of quantitative computed tomography (QCT) in the evaluation asthma patients and to correlate its use with the pulmonary function test (PFT). Thirty asthmatic patients and thirty normal volunteers were prospectively evaluated by the use of HRCT and the PFT. By using 16 slice MDCT, HRCT was performed from the apex to the base of both lungs at the end inspiration and end expiration periods in all patients and images were reconstructed to a thickness of 1 mm (window level: -750 HU, window width: 1,500 HU). We analyzed each image for the whole lung using the Pulmo CT program. PFTs including FVC and FEV1 were performed one week prior and one week after the completion of a HRCT. The Difference of QCT (the mean lung density and subrange ratio) between volunteers and asthmatic patients was analyzed by using the Student's t-test. Spearman's correlation test was used to determine the association between PFT and QCT. The mean lung density (MLD) and subrange ratio were lower in asthmatic patients than in volunteers for and expiration and no difference was seen between asthmatic patients and volunteers for end inspiration. FVC and FEV1 were lower in asthmatic patients than in volunteers. A decrease in FVC and FEV1 correlated with changes in the MLD and subrange ratio for end expiration. QCT such as MLD and the subrange ratio using HRCT can be used to indirectly assess the pulmonary function of the asthma patient. The PFT seems to correlate better with the MLD and subrange ratio for expiratory QCT of the asthma patient than with inspiratory QCT.

  3. Bronchial asthma: correlation of quantitative CT and the pulmonary function test

    International Nuclear Information System (INIS)

    The purpose of this study was to assess the availability of quantitative computed tomography (QCT) in the evaluation asthma patients and to correlate its use with the pulmonary function test (PFT). Thirty asthmatic patients and thirty normal volunteers were prospectively evaluated by the use of HRCT and the PFT. By using 16 slice MDCT, HRCT was performed from the apex to the base of both lungs at the end inspiration and end expiration periods in all patients and images were reconstructed to a thickness of 1 mm (window level: -750 HU, window width: 1,500 HU). We analyzed each image for the whole lung using the Pulmo CT program. PFTs including FVC and FEV1 were performed one week prior and one week after the completion of a HRCT. The Difference of QCT (the mean lung density and subrange ratio) between volunteers and asthmatic patients was analyzed by using the Student's t-test. Spearman's correlation test was used to determine the association between PFT and QCT. The mean lung density (MLD) and subrange ratio were lower in asthmatic patients than in volunteers for and expiration and no difference was seen between asthmatic patients and volunteers for end inspiration. FVC and FEV1 were lower in asthmatic patients than in volunteers. A decrease in FVC and FEV1 correlated with changes in the MLD and subrange ratio for end expiration. QCT such as MLD and the subrange ratio using HRCT can be used to indirectly assess the pulmonary function of the asthma patient. The PFT seems to correlate better with the MLD and subrange ratio for expiratory QCT of the asthma patient than with inspiratory QCT

  4. Clinical Application of 16 Row CT in the Diagnosis of Lumbar Disc Herniation%16排CT在腰椎间盘突出诊断中的临床应用价值

    Institute of Scientific and Technical Information of China (English)

    徐廷忠

    2015-01-01

    Objective To explore the effect of clinical diagnosis of 16 slice CT in patients with lumbar disc protrusion.Methods 998 cases of lumbar disc herniation were selected from January 2012 to December 2014 in our hospital, carries on the 16 row CT diagnosis, and after operation and MBI examination confirmed the diagnosis coincidence rate, calculation, comparison and analysis.ResultsThe diagnosis of 998 patients, 252 cases of genera in the bulge type, 388 cases of protrusion type, 305 cases of prolapse of free type, 53 cases of schmorl with bone nodules and prominent, with surgery and MBI diagnosis of consistent with the results of 910 cases, the coincidence rate is 91.2%.Conclusion16 slice CT has better use value in the diagnosis of lumbar disc herniation patients.%目的:探讨16排CT对临床腰椎间盘突出患者的诊断效果。方法选取2012年1月~2014年12月期间来我院就诊的998例腰椎间盘突出患者为研究对象,对其进行16排CT诊断,并经过手术及MBI检查证实,计算该诊断的符合率,对比分析。结果经诊断,998例患者中,有252例属中膨隆型,388例突出型,305例脱垂游离型,53例Schmorl结节及经骨突出型,与手术和MBI诊断结果相符的有910例,相符率为91.2%。结论16排CT在腰椎间盘突出患者的诊断中具有较好的使用价值。

  5. CT and MR urography

    International Nuclear Information System (INIS)

    Full text: Learning objectives:1) To describe the techniques of CT Urography and of MR urography; 2) To illustrate the benefit of the methods in clinical practice; 3)To present typical cases from the daily practice CT has become the mainstay of uroradiology in adults. CT urography is an excellent technique for the evaluation of urinary tract calculi, trauma, infections, complicated cysts, renal masses, having high sensitivity and specificity for both conditions facilitated by the possibilities for multiplanar imaging of the urinary system. It resembles excretory urography and consists of unenhanced, nephrographic, and pyelographic phases and can be used even as routine investigation. MR urography is a new, modern modality for evaluation of various urological abnormalities providing both morphological and functional information by means of different sequences with or without injection of gadolinium. The method is clinically useful in the evaluation of the collecting system, various variants and congenital abnormalities of the kidney, different cases of obstruction of the excretory system, tumors and inflammatory processes, hematuria. Compared to CT urography, MR urography is particularly beneficial in pediatric group or pregnant patients. It can also be performed in patients with renal insufficiency, iodine allergy and other cases of contraindications to the use of ionizing radiation. CT and MR urography are promising diagnostic methods of the wide spectrum of pathological conditions affecting the urinary tract. They are highly informative and overcome a lot of limitations of the other imaging modalities with the potential to become leading modalities to diagnose kidney diseases and other urogenital disorders.

  6. CT in dental osseointegration

    International Nuclear Information System (INIS)

    Computerised tomography (CT) plays a key role in the pre-surgical evaluation of the alveolar process for titanium dental implants. The successful replacement of lost teeth by tissue integrated tooth root implants is a major advance in clinical dentistry. The paper will discuss briefly the history of osseointegration and how CT is now involved in helping the edentulous patient. CT is considered as a quick and convenient method of obtaining excellent anatomical information about the maxilla. Conventional tomography is difficult to obtain and does not provide valuable cross-sectional images. Exact height and width calculations can be made as well as screening out patients with advanced bone resorption. 3 refs. 6 figs

  7. Axial skeletal CT densitometry

    International Nuclear Information System (INIS)

    Since the discovery of the Roentgen ray a precise and accurate assessment of bone mineral content has been a challenge to many investigators. A number of methods have been developed but no one satisfied. Considering its technical possibilities computed tomography is very promising in determination of bone mineral content (BMC). The new modality enables BMC estimations in the axial skeletal trabecular bone. CT densitometry can be performed on a normal commercially available third generation whole body CT scanner. No dedicated device in a special clinical set-up is necessary. In this study 106 patients, most of them clinically suspected of osteoporosis, were examined. The new method CT densitometry has been evaluated. The results have been correlated to alternative BMC determination methods. (Auth.)

  8. CT findings of fibromatoses

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hak Nam; Choi, Yeon Hwa; Shin, Hyun Jun [Lee Rha Hospital, Chung Ju (Korea, Republic of)

    1991-03-15

    Fibromatoses constitute a group of benign fibroblastic soft tissue tumors with a tendency for local invasion and recurrence. CT provides excellent anatomic detail of soft tissue tumors and precise location, size, and extent of the tumors. The authors evaluated 7 CT scans of 6 pathologically proven aggressive fibromatoses during the last 4 years. Five lesions arose in the lower extremities: 4 in the buttocks and 1 in the thigh. One lesion arose in the upper back. The tumors were lobulated in contour and varied in size from 3.7 cm to 10.7 cm. Fibromatosis tumors were usually hypodense with muscle when no contrast medium was used and hyperdense with better delineation during infusion of the contrast medium. Three patients had recurrent disease after surgical removal. Fibromatosis may infiltrate the surrounding tissue beyond the margins, indicated on CT scans and by palpation at operation. Therefore the surgeon should plan a wide resection around the apparent limits of the fibromatosis.

  9. Comparison of neutral oral contrast versus positive oral contrast medium in abdominal multidetector CT

    Energy Technology Data Exchange (ETDEWEB)

    Berther, Ralph; Eckhardt, Boris; Zollikofer, Christoph L. [Kantonsspital, Institute of Radiology, Winterthur (Switzerland); Patak, Michael A. [Kantonsspital, Institute of Radiology, Winterthur (Switzerland); Inselspital, University Hospital of Bern, Institute of Diagnostic, Interventional and Paediatric Radiology, Bern (Switzerland); Erturk, Sukru M. [Sisli Etfal Education and Research Hospital, Department of Radiology, Istanbul (Turkey)

    2008-09-15

    To determine whether neutral contrast agents with water-equivalent intraluminal attenuation can improve delineation of the bowel wall and increase overall image quality for a non-selected patient population, a neutral oral contrast agent (3% mannitol) was administered to 100 patients referred for abdominal multidetector row computed tomography (MDCT). Their results were compared with those of 100 patients given a positive oral contrast agent. Qualitative and quantitative measurements were done on different levels of the gastrointestinal tract by three experienced readers. Patients given the neutral oral contrast agent showed significant better qualitative results for bowel distension (P<0.001), homogeneity of the luminal content (P<0.001), delineation of the bowel-wall to the lumen (P<0.001) and to the mesentery (P<0.001) and artifacts (P<0.001), leading to a significant better overall image quality (P<0.001) than patients receiving positive oral contrast medium. The quantitative measurements revealed significant better distension (P<0.001) and wall to lumen delineation (P<0.001) for the patients receiving neutral oral contrast medium. The present results show that the neutral oral contrast agent (mannitol) produced better distension, better homogeneity and better delineation of the bowel wall leading to a higher overall image quality than the positive oral contrast medium in a non-selected patient population. (orig.)

  10. CT-based geometry analysis and finite element models of the human and ovine bronchial tree.

    Science.gov (United States)

    Tawhai, Merryn H; Hunter, Peter; Tschirren, Juerg; Reinhardt, Joseph; McLennan, Geoffrey; Hoffman, Eric A

    2004-12-01

    The interpretation of experimental results from functional medical imaging is complicated by intersubject and interspecies differences in airway geometry. The application of computational models in understanding the significance of these differences requires methods for generation of subject-specific geometric models of the bronchial airway tree. In the current study, curvilinear airway centerline and diameter models have been fitted to human and ovine bronchial trees using detailed data segmented from multidetector row X-ray-computed tomography scans. The trees have been extended to model the entire conducting airway system by using a volume-filling algorithm to generate airway centerline locations within detailed volume descriptions of the lungs or lobes. Analysis of the geometry of the scan-based and model-based airways has verified their consistency with measures from previous anatomic studies and has provided new anatomic data for the ovine bronchial tree. With the use of an identical parameter set, the volume-filling algorithm has produced airway trees with branching asymmetry appropriate for the human and ovine lung, demonstrating the dependence of the method on the shape of the lung or lobe volume. The modeling approach that has been developed can be applied to any level of detail of the airway tree and into any volume shape for the lung; hence it can be used directly for different individuals or animals and for any number of scan-based airways. The resulting models are subject-specific computational meshes with anatomically consistent geometry, suitable for application in simulation studies.

  11. Normal cranial CT anatomy

    International Nuclear Information System (INIS)

    The human brain consists of well-known anatomical components. Some parts of these components have been shown to be concerned with certain functions. A complete cranial CT examination consists of a series of several slices obtained in a sequence usually from the base to the vertex of the cranial vault, in the axial mode. The ultimate goal of this chapter is to pinpoint those slices that depict a given anatomical structure or several structures that deal with a given function. To achieve this goal, the discussion of CT cranial anatomy is presented in three sections

  12. PET-CT in oncology: making the most of CT

    OpenAIRE

    Miles, K. A.

    2008-01-01

    Abstract Combined positron emission tomography–computed tomography (PET-CT) has made a significant impact on cancer imaging. The use of CT to map tissue attenuation for correction of PET images and the ability to co-register the functional information provided by PET with the anatomical data afforded by CT, has resulted in demonstrable improvements in diagnostic accuracy. However, attenuation correction and anatomical localisation may not represent the full benefits of integrating CT with PET...

  13. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... with the CT technologist or nurse at the time of the CT examination. If your child has ... detectors rotate around the patient. At the same time, the examination table is moving through the scanner, ...

  14. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... the body, in a shorter period of time. Modern CT scanners are so fast that they can ... ensure that he/she is properly positioned. With modern CT scanners, your child will hear only slight ...

  15. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... top of page What are the benefits vs. risks? Benefits Using a multidetector CT unit to examine ... CT scans should have no immediate side effects. Risks The risk of serious allergic reaction to contrast ...

  16. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... sensitive to radiation, they should have a CT study only if it is essential for making a diagnosis and should not have repeated CT studies unless absolutely necessary. top of page What are ...

  17. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... obtain CT images. It is known that high levels of radiation may cause cancer. However, CT scans result in a low-level exposure. Whether such levels cause cancer is debatable ...

  18. Abdominal CT scan

    Science.gov (United States)

    ... than regular x-rays. Many x-rays or CT scans over time may increase your risk for cancer. However, the risk from any one scan is small. Talk to your doctor about this risk and the benefit of the test for getting a correct diagnosis ...

  19. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... Rotating around you, the x-ray tube and electronic x-ray detectors are located opposite each other ... another on an x-ray film or CT electronic image. In a conventional x-ray exam, a ...

  20. Hepatic angiosarcoma: CT findings

    Institute of Scientific and Technical Information of China (English)

    余日胜; 章士正; 华建明

    2003-01-01

    @@ Hepatic angiosarcoma is a rare malignant vascular tumor. Accurate preoperative diagnosis of this tumor is very difficult if the patient does not have any history of exposure to specific carcinogens including thorotrast, arsenicals and vinyl chloride monomer. We describe CT findings in two cases of hepatic angiosarcoma in combination with a review of the literature.

  1. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... can be performed if you have an implanted medical device of any kind, unlike MRI. A diagnosis determined by CT scanning may eliminate the need for exploratory surgery and surgical biopsy. No radiation remains ... is not a medical facility. Please contact your physician with specific medical ...

  2. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... can be performed if you have an implanted medical device of any kind, unlike MRI. CT imaging provides real-time imaging, making it a good tool for guiding minimally invasive procedures such as needle ... is not a medical facility. Please contact your physician with specific medical ...

  3. Abdominal aspergillosis: CT findings

    Energy Technology Data Exchange (ETDEWEB)

    Yeom, Suk Keu, E-mail: pagoda20@hanmail.net [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of); Kim, Hye Jin, E-mail: kimhyejin@amc.seoul.kr [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of); Byun, Jae Ho, E-mail: jhbyun@amc.seoul.kr [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of); Kim, Ah Young, E-mail: aykim@amc.seoul.kr [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of); Lee, Moon-Gyu, E-mail: mglee@amc.seoul.kr [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of); Ha, Hyun Kwon, E-mail: hkha@amc.seoul.kr [Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap2-dong, Songpa-gu, Seoul, 138-736 (Korea, Republic of)

    2011-03-15

    Objective: In order to retrospectively evaluate the CT findings of abdominal aspergillosis in immunocompromised patients. Materials and methods: CT scans were reviewed with regard to the sites, number, morphologic appearance, attenuation, and the contrast enhancement patterns of the lesions in six patients (5 women, 1 man; mean age, 43.4 years; range, 23-59 years) with pathologically proved abdominal aspergillosis by two gastrointestinal radiologists in consensus. Medical records were also reviewed to determine each patient's clinical status and outcome. Results: All patients were immunocompromised state: 4 patients received immunosuppressive therapy for solid organ transplantation and 2 patients received chemotherapy for acute myeloid leukemia. Aspergillosis involved blood vessels (n = 3), liver (n = 2), spleen (n = 2), gastrointestinal tract (n = 2), native kidney (n = 1), transplanted kidney (n = 1), peritoneum (n = 1), and retroperitoneum (n = 1). CT demonstrated solid organ or bowel infarction or perforation secondary to vascular thrombosis or pseudoaneurysm, multiple low-attenuating lesions of solid organs presenting as abscesses, concentric bowel wall thickening mimicking typhlitis, or diffuse or nodular infiltration of the peritoneum and retroperitoneum. Conclusion: Familiarity with findings commonly presenting as angioinvasive features or abscesses on CT, may facilitate the diagnosis of rare and fatal abdominal aspergillosis.

  4. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... of data to create two-dimensional cross-sectional images of your body, which are then displayed on a monitor. CT ... during the scanning. Any motion, whether breathing or body movements, can lead to artifacts on the images. This loss of image quality can resemble the ...

  5. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... of data to create two-dimensional cross-sectional images of your body, which are then displayed on a monitor. CT ... during the scanning. Any motion, whether breathing or body movements, can lead to artifacts on the images. This loss of image quality can resemble the ...

  6. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... Rotating around you, the x-ray tube and electronic x-ray detectors are located opposite each other ... another on an x-ray film or CT electronic image. In a conventional x-ray exam, a ...

  7. Refining CT colonography methods

    NARCIS (Netherlands)

    T.N. Boellaard

    2013-01-01

    CT-colografie is een structurele radiologische techniek om de dikke darm te onderzoeken op poliepen en kanker. De techniek wordt in de klinische praktijk gebuikt wanneer coloscopie incompleet is, maar ook als alternatief voor coloscopie. Alle technieken hebben hun beperkingen en voor sommige aspecte

  8. Pulmonary hypertension CT imaging

    International Nuclear Information System (INIS)

    Full text: The right heart catheterization is the gold standard in the diagnosis and determines the severity of pulmonary hypertension. The significant technical progress of noninvasive diagnostic imaging methods significantly improves the pixel density and spatial resolution in the study of cardiovascular structures, thus changes their role and place in the overall diagnostic plan. Learning points: What is the etiology, clinical manifestation and general pathophysiological disorders in pulmonary hypertension. What are the established diagnostic methods in the diagnosis and follow-up of patients with pulmonary hypertension. What is the recommended protocol for CT scanning for patients with clinically suspected or documented pulmonary hypertension. What are the important diagnostic findings in CT scan of a patient with pulmonary hypertension. Discussion: The prospect of instantaneous complex - anatomical and functional cardiopulmonary and vascular diagnostics seems extremely attractive. The contrast enhanced multislice computed (CT ) and magnetic resonance imaging are very suitable methods for imaging the structures of the right heart, with the possibility of obtaining multiple projections and three-dimensional imaging reconstructions . There are specific morphological features that, if carefully analyzed, provide diagnostic information. Thus, it is possible to avoid or at least reduce the frequency of use of invasive diagnostic cardiac catheterization in patients with pulmonary hypertension. Conclusion: This review focuses on the use of contrast-enhanced CT for comprehensive evaluation of patients with pulmonary hypertension and presents the observed characteristic changes in the chest, lung parenchyma , the structures of the right half of the heart and pulmonary vessels

  9. Abdominal aspergillosis: CT findings

    International Nuclear Information System (INIS)

    Objective: In order to retrospectively evaluate the CT findings of abdominal aspergillosis in immunocompromised patients. Materials and methods: CT scans were reviewed with regard to the sites, number, morphologic appearance, attenuation, and the contrast enhancement patterns of the lesions in six patients (5 women, 1 man; mean age, 43.4 years; range, 23-59 years) with pathologically proved abdominal aspergillosis by two gastrointestinal radiologists in consensus. Medical records were also reviewed to determine each patient's clinical status and outcome. Results: All patients were immunocompromised state: 4 patients received immunosuppressive therapy for solid organ transplantation and 2 patients received chemotherapy for acute myeloid leukemia. Aspergillosis involved blood vessels (n = 3), liver (n = 2), spleen (n = 2), gastrointestinal tract (n = 2), native kidney (n = 1), transplanted kidney (n = 1), peritoneum (n = 1), and retroperitoneum (n = 1). CT demonstrated solid organ or bowel infarction or perforation secondary to vascular thrombosis or pseudoaneurysm, multiple low-attenuating lesions of solid organs presenting as abscesses, concentric bowel wall thickening mimicking typhlitis, or diffuse or nodular infiltration of the peritoneum and retroperitoneum. Conclusion: Familiarity with findings commonly presenting as angioinvasive features or abscesses on CT, may facilitate the diagnosis of rare and fatal abdominal aspergillosis.

  10. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... other medical conditions and whether you have a history of heart disease, asthma, diabetes, kidney disease or ... gantry. The computer workstation that processes the imaging information is located ... in detector technology allow nearly all CT scanners to obtain multiple ...

  11. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... other medical conditions and whether you have a history of heart disease, asthma, diabetes, kidney disease or ... gantry. The computer workstation that processes the imaging information is located ... in detector technology allow nearly all CT scanners to obtain multiple ...

  12. Computed Tomography (CT) -- Sinuses

    Medline Plus

    Full Text Available ... Computed tomography (CT) of the sinuses uses special x-ray equipment to evaluate the paranasal sinus cavities – hollow, ... is a diagnostic medical test that, like traditional x-rays, produces multiple images or pictures of the inside ...

  13. Computed Tomography (CT) -- Head

    Medline Plus

    Full Text Available ... Computed tomography (CT) of the head uses special x-ray equipment to help assess head injuries, severe headaches, ... is a diagnostic medical test that, like traditional x-rays, produces multiple images or pictures of the inside ...

  14. Seventh-generation CT

    Science.gov (United States)

    Besson, G. M.

    2016-03-01

    A new dual-drum CT system architecture has been recently introduced with the potential to achieve significantly higher temporal resolution than is currently possible in medical imaging CT. The concept relies only on known technologies; in particular rotation speeds several times higher than what is possible today could be achieved leveraging typical x-ray tube designs and capabilities. However, the architecture lends itself to the development of a new arrangement of x-ray sources in a toroidal vacuum envelope containing a rotating cathode ring and a (optionally rotating) shared anode ring to potentially obtain increased individual beam power as well as increase total exposure per rotation. The new x-ray source sub-system design builds on previously described concepts and could make the provision of multiple conventional high-power cathodes in a CT system practical by distributing the anode target between the cathodes. In particular, relying on known magnetic-levitation technologies, it is in principle possible to more than double the relative speed of the electron-beam with respect to the target, thus potentially leading to significant individual beam power increases as compared to today's state-of-the-art. In one embodiment, the proposed design can be naturally leveraged by the dual-drum CT concept previously described to alleviate the problem of arranging a number of conventional rotating anode-stem x-ray tubes and power conditioners on the limited space of a CT gantry. In another embodiment, a system with three cathodes is suggested leveraging the architecture previously proposed by Franke.

  15. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... CT examinations are fast and simple; in emergency cases, they can reveal internal injuries and bleeding quickly enough to help save lives. CT has been shown to be a cost-effective imaging tool for a wide range of clinical problems. CT is less sensitive to patient movement ...

  16. Technical aspects of CT scanning.

    Science.gov (United States)

    Maravilla, K R; Pastel, M S

    1978-01-01

    The advent of computed tomography (CT) has initiated a technological revolution which continues to the present time. A brief review of basic principles of CT scanning is presented, and the evolution of modern CT scanner systems is traced. Some early indications of future trends are also presented.

  17. Venous thromboembolic disease. CT evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Goodman, L. R. [Medical College of Wisconsin, Pulmonary Medicine and Intensive Care, Dept. of Diagnostic Radiology, Milwaukee, WI (United States)

    2001-12-01

    Helical and multidetector CT has proven to be a valuable imaging modality for both pulmonary embolism and deep venous thrombosis. This paper will review the sensitivity and specificity of CT and discuss diagnostic algorithms utilizing CT and more established imaging technologies.

  18. SU-E-I-26: The CT Compatibility of a Novel Direction Modulated Brachytherapy (DMBT) Tandem Applicator for Cervical Cancer

    International Nuclear Information System (INIS)

    Purpose: To examine CT metal image artifact from a novel direction-modulated brachytherapy (DMBT) tandem applicator (95% tungsten) for cervical cancer using a commercially available orthopedic metal artifact reduction (O-MAR) algorithm. Comparison to a conventional stainless steel applicator is also performed. Methods: Each applicator was placed in a water-filled phantom resembling the female pelvis and scanned in a Philips Brilliance 16-slice CT scanner using two pelvis protocols: a typical clinical protocol (120kVp, 16×0.75mm collimation, 0.692 pitch, 1.0s rotation, 350mm field of view (FOV), 600mAs, 1.5mm slices) and a protocol with a higher kVp and mAs setting useful for larger patients (140kVp, 16×0.75mm collimation, 0.688 pitch, 1.5s rotation, 350mm FOV, 870mAs, 1.5mm slices). Images of each tandem were acquired with and without the application of the O-MAR algorithm. Baseline scans of the phantom (no applicator) were also collected. CT numbers were quantified at distances from 5 to 30 mm away from the applicator’s edge (in increments of 5mm) using measurements at eight angles around the applicator, on three consecutive slices. Results: While the presence of both applicators degraded image quality, the DMBT applicator resulted in larger streaking artifacts and dark areas in the image compared to the stainless steel applicator. Application of the O-MAR algorithm improved all acquired images, both visually and quantitatively. The use of low and high kVp and mAs settings (120 kVp/600mAs and 140 kVp/870mAs) in conjunction with the O-MAR algorithm lead to similar CT numbers in the vicinity of the applicator and a similar reduction of the induced metal artifact. Conclusion: This work indicated that metal artifacts induced by the DMBT and the stainless steel applicator are greatly reduced when using the O-MAR algorithm, leading to better quality phantom images. The use of a high dose protocol provided similar improvements in metal artifacts compared to the

  19. SU-E-I-26: The CT Compatibility of a Novel Direction Modulated Brachytherapy (DMBT) Tandem Applicator for Cervical Cancer

    Energy Technology Data Exchange (ETDEWEB)

    Elzibak, A; Safigholi, H; Soliman, A; Ravi, A; Song, WY [Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario (Canada); Kager, P [The Netherlands Cancer Institute, Amsterdam (Netherlands); Han, D [Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario (Canada); University of California, San Diego, La Jolla, CA (United States)

    2015-06-15

    Purpose: To examine CT metal image artifact from a novel direction-modulated brachytherapy (DMBT) tandem applicator (95% tungsten) for cervical cancer using a commercially available orthopedic metal artifact reduction (O-MAR) algorithm. Comparison to a conventional stainless steel applicator is also performed. Methods: Each applicator was placed in a water-filled phantom resembling the female pelvis and scanned in a Philips Brilliance 16-slice CT scanner using two pelvis protocols: a typical clinical protocol (120kVp, 16×0.75mm collimation, 0.692 pitch, 1.0s rotation, 350mm field of view (FOV), 600mAs, 1.5mm slices) and a protocol with a higher kVp and mAs setting useful for larger patients (140kVp, 16×0.75mm collimation, 0.688 pitch, 1.5s rotation, 350mm FOV, 870mAs, 1.5mm slices). Images of each tandem were acquired with and without the application of the O-MAR algorithm. Baseline scans of the phantom (no applicator) were also collected. CT numbers were quantified at distances from 5 to 30 mm away from the applicator’s edge (in increments of 5mm) using measurements at eight angles around the applicator, on three consecutive slices. Results: While the presence of both applicators degraded image quality, the DMBT applicator resulted in larger streaking artifacts and dark areas in the image compared to the stainless steel applicator. Application of the O-MAR algorithm improved all acquired images, both visually and quantitatively. The use of low and high kVp and mAs settings (120 kVp/600mAs and 140 kVp/870mAs) in conjunction with the O-MAR algorithm lead to similar CT numbers in the vicinity of the applicator and a similar reduction of the induced metal artifact. Conclusion: This work indicated that metal artifacts induced by the DMBT and the stainless steel applicator are greatly reduced when using the O-MAR algorithm, leading to better quality phantom images. The use of a high dose protocol provided similar improvements in metal artifacts compared to the

  20. Dynamic CT myocardial perfusion imaging.

    Science.gov (United States)

    Caruso, Damiano; Eid, Marwen; Schoepf, U Joseph; Jin, Kwang Nam; Varga-Szemes, Akos; Tesche, Christian; Mangold, Stefanie; Spandorfer, Adam; Laghi, Andrea; De Cecco, Carlo N

    2016-10-01

    Non-invasive cardiac imaging has rapidly evolved during the last decade due to advancements in CT based technologies. Coronary CT angiography has been shown to reliably assess coronary anatomy and detect high risk coronary artery disease. However, this technique is limited to anatomical assessment, thus non-invasive techniques for functional assessment of the heart are necessary. CT myocardial perfusion is a new CT based technique that provides functional assessment of the myocardium and allows for a comprehensive assessment of coronary artery disease with a single modality when combined with CTA. This review aims to discuss dynamic CT myocardial perfusion as a new technique in the assessment of CAD.

  1. CT findings in mucopolysaccharidoses

    International Nuclear Information System (INIS)

    The CT findings for four patients with mucopolysaccharidosis were analyzed using a Delta scan-25 (Ohio Nuclear). In three cases of Hunter's syndrome (MPS IIA 13-year-old male, MPS IIB 12-year-old male, and 25-year-old male), a dilatation of the cortical sulci was observed. Moderate dilatations were also seen in the basal cistern, the quadrigeminal cistern, and the ambient cistern. In one case of Hunter's syndrome, a low-density area was observed in the bilateral tharamic regions. An irregular low-density area was also seen in the white matter in some cases. PVL was not apparent in any case. Marked ventricular dilations were observed in cases with mental retardation, for example, in one case of Hurler's syndrome (8-year-old male) and one case of MPS IIA. The circulation and absorbtion of CSF in cortical snbarachnoid spaces were supposed to be moderately retarded by metrizamide CT cisternography. (author)

  2. CT colonography: an update

    Energy Technology Data Exchange (ETDEWEB)

    Aschoff, Andrik J.; Ernst, Andrea S.; Brambs, Hans-Juergen; Juchems, Markus S. [University Hospitals of Ulm, Diagnostic and Interventional Radiology, Ulm (Germany)

    2008-03-15

    Computed tomographic (CT) colonography (CTC) - also known as ''virtual colonoscopy'' - was first described more than a decade ago. As advancements in scanner technology and three-dimensional (3D) postprocessing helped develop this method to mature into a potential option in screening for colorectal cancer, the fundamentals of the examination remained the same. It is a minimally invasive, CT-based procedure that simulates conventional colonoscopy using 2D and 3D computerized reconstructions. The primary aim of CTC is the detection of colorectal polyps and carcinomas. However, studies reveal a wide performance variety in regard to polyp detection, especially for smaller polyps. This article reviews the available literature, discusses established indications as well as open issues and highlights potential future developments of CTC. (orig.)

  3. Multislice computed tomography perfusion imaging for visualization of acute pulmonary embolism: animal experience

    Energy Technology Data Exchange (ETDEWEB)

    Wildberger, Joachim Ernst; Spuentrup, Elmar; Mahnken, Andreas H.; Guenther, Rolf W. [University Hospital, RWTH Aachen, Department of Diagnostic Radiology, Aachen (Germany); Klotz, Ernst; Ditt, Hendrik [Computed Tomography, Siemens Medical Solutions, Forchheim (Germany)

    2005-07-01

    The purpose of our animal study was to evaluate a new computed tomography (CT) subtraction technique for visualization of perfusion defects within the lung parenchyma in subsegmental pulmonary embolism (PE). Seven healthy pigs were entered into a prospective trial. Acute PE was artificially induced by fresh clot material prior to the CT scans. Within a single breath-hold, whole thorax CT scans were performed with a 16-slice multidetector-row CT scanner (SOMATOM Sensation 16; Siemens, Forchheim, Germany) before and after intravenous application of 80 ml of contrast medium with a flow rate of 4 ml/s, followed by a saline chaser. The scan parameters were 120 kV and 100 mAs{sub eff}, using a thin collimation of 16 x 0.75 mm and a table speed/rotation of 15-18 mm (pitch, 1.25-1.5; rotation time, 0.5 s). Axial source images were reconstructed with an effective slice thickness of 1 mm (overlap, 30%). A new automatic subtraction technique was used. After 3D segmentation of the lungs in the plain and contrast-enhanced series, threshold-based extraction of major airways and vascular structures in the contrast images was performed. This segmentation was repeated in the plain CT images segmenting the same number of vessels and airways as in the contrast images. Both scans were registered onto each other using nonrigid registration. After registration both image sets were filtered in a nonlinear fashion excluding segmented airways and vessels. After subtracting the plain CT data from the contrast data the resulting enhancement images were color-encoded and overlaid onto the contrast-enhanced CT angiography (CTA) images. This color-encoded combined display of parenchymal enhancement of the lungs was evaluated interactively on a workstation (Leonardo, Siemens) in axial, coronal and sagittal plane orientations. Axial contrast-enhanced CTA images were rated first, followed by an analysis of the combination images. Finally, CTA images were reread focusing on areas with perfusion

  4. CT findings of ganglioneuroma

    Energy Technology Data Exchange (ETDEWEB)

    Jeon, Tae Joo; Yoon, Choon Sik; Kim, Myung Jun; Kim, Sang Jin; Oh, Ki Keun [Yonsei Univ., College of Medicine, Seoul (Korea, Republic of)

    1998-09-01

    Ganglioneuroma is a relatively uncommon benign tumor and has no pathognomonic radiological findings;diagnosis is therefore difficult. In order to better diagnose this tumor we analysed its CT findings and pathologic correlation. Seventeen tumors in 16 patients(M:F=3D9:7) diagnosed as ganglioneuroma between 1992 and 1996 were retrospectively analysed with regard to location, size, contour, long axis of the mass, enhancement pattern, calcification, necrosis and capsulation, all as seen on CT, and compared with histo-pathologic findings. Tumors were 1.5 to 10(mean, 5.6) cm in size, and their location was mediastinal(n=3D12), cervical(n=3D2), retroperitoneal (n=3D2) or adrenal(n=3D1). Fifteen had an oval or round contour and two were dumb-bell-shaped. The long axis of the lesion was craniocaudal in 14 cases and non-specific in three. Thirteen lesions showed heterogeneous enhancement, and four homogeneous. Capsule-like enhancement was noted on CT scans in eight cases;there was no definite correlation between enhancement pattern and pathologic findings. Calcification was seen in six cases and an inner low-density lesion in two. Ganglioneuroma is a benign neurogenic tumor, occurring most frequently at the posterior mediastinum. General CT findings of this tumor are a well-defined oval shape with a variable enhancement pattern, but several cases showed focal calcification or inner low density. For accurate diagnosis of ganglioneuroma both common and uncommon findings must therefore be considered.=20.

  5. Quantitative micro-CT

    Science.gov (United States)

    Prevrhal, Sven

    2005-09-01

    Micro-CT for bone structural analysis has progressed from an in-vitro laboratory technique to devices for in-vivo assessment of small animals and the peripheral human skeleton. Currently, topological parameters of bone architecture are the primary goals of analysis. Additional measurement of the density or degree of mineralization (DMB) of trabecular and cortical bone at the microscopic level is desirable to study effects of disease and treatment progress. This information is not commonly extracted because of the challenges of accurate measurement and calibration at the tissue level. To assess the accuracy of micro-CT DMB measurements in a realistic but controlled situation, we prepared bone-mimicking watery solutions at concentrations of 100 to 600 mg/cm3 K2PO4H and scanned them with micro-CT, both in glass vials and microcapillary tubes with inner diameters of 50, 100 and 150 μm to simulate trabecular thickness. Values of the linear attenuation coefficients μ in the reconstructed image are commonly affected by beam hardening effects for larger samples and by partial volume effects for small volumes. We implemented an iterative reconstruction technique to reduce beam hardening. Partial voluming was sought to be reduced by excluding voxels near the tube wall. With these two measures, improvement on the constancy of the reconstructed voxel values and linearity with solution concentration could be observed to over 90% accuracy. However, since the expected change in real bone is small more measurements are needed to confirm that micro-CT can indeed be adapted to assess bone mineralization at the tissue level.

  6. Multi-slice CT for visualization of acute pulmonary embolism: single breath-hold subtraction technique

    Energy Technology Data Exchange (ETDEWEB)

    Wildberger, J.E.; Mahnken, A.H.; Spuentrup, E.; Guenther, R.W. [Dept. of Diagnostic Radiology, Univ. of Technology, Aachen (Germany); Klotz, E.; Ditt, H. [Siemens Medical Solutions, Computed Tomography, Forchheim (Germany)

    2005-01-01

    Purpose: the purpose of our preliminary animal study was to evaluate the feasibility of a new subtraction technique for visualization of perfusion defects within the lung parenchyma in segmental and subsegmental pulmonary embolism (PE). Materials and methods: in three healthy pigs, PE were artificially induced by fresh human clot material. Within a single breath-hold, CT angiography (CTA) was performed on a 16-slice multi-slice CT scanner (SOMATOM Sensation 16; Siemens, Forchheim, Germany) before and after intravenous application of 80 mL of contrast-medium, followed by a saline chaser. Scan parameters were 120 kV and 100 mAs{sub eff.}, using a collimation of 16 x 1.5 mm and a table speed/rot. of 36 mm (pitch: 1.5; rotation time: 0.5 s). A new 3D subtraction technique was developed, which is based on automated segmentation, non-linear spatial filtering and non-rigid registration. Data were analysed using a color-encoded ''compound view'' of parenchymal enhancement and CTA information displayed in axial, coronal and sagittal orientation. Results: subtraction was technically feasible in all three data sets. The mean scan time for each series was 4.7 s, interscan delay was 14.7 s, respectively. Therefore, an average breath-hold of approximately 24 s was required for the overall scanning procedure. Downstream of occluded segmental and subsegmental arteries, perfusion defects were clearly assessable, showing lower or missing enhancement compared to normally perfused lung parenchyma. In all pigs, additional peripheral areas with triangular shaped perfusion defects were delineated, considered typical for PE. Conclusions: our initial results from the animal model studied slow that perfusion imaging of PE is feasible within a single breath-hold. It allows a comprehensive assessment of perfusion deficits as the direct proof of a pulmonary embolus, can be combined with an indirect visual quantification of the density changes in the adjacent lung tissue

  7. The multidetector computed tomography angiography (MDCTA) in the diagnosis of splenic artery aneurysm and pseudoaneurysm

    Energy Technology Data Exchange (ETDEWEB)

    Saba, Luca; Mallarini, Giorgio (Dept. of Radiology, Azienda Ospedaliero Universitaria (AOU), Cagliari (Italy)), email: lucasaba@tiscali.it; Anzidei, Michele; Lucatelli, Pierleone (Dept. of Radiological Sciences, Univ. of Rome La Sapienza, Rome (Italy))

    2011-06-15

    Splenic artery aneurysm is the most frequent visceral artery aneurysm and rupture of the aneurysm is associated with a high mortality rate. It is important to discriminate between a true aneurysm and a pseudoaneurysm that may be caused by pancreatitis, iatrogenic and postoperative causes, trauma and peptic ulcer disease. Multidetector-row CT angiography (MDCTA) allows detailed visualization of the vascular anatomy and may allow identification of aneurysms and pseudoaneurysms that affect the splenic artery. The objective of this article is to provide a review of the general characteristics of splenic artery aneurysms and pseudoaneurysms and to describe the findings of MDCTA

  8. Cine CT for Attenuation Correction in Cardiac PET/CT

    OpenAIRE

    Alessio, Adam M.; Kohlmyer, Steve; Branch, Kelley; Chen, Grace; Caldwell, James; Kinahan, Paul

    2007-01-01

    In dual-modality PET/CT systems, the CT scan provides the attenuation map for PET attenuation correction. The current clinical practice of obtaining a single helical CT scan provides only a snapshot of the respiratory cycle, whereas PET occurs over multiple respiratory cycles. Misalignment of the attenuation map and emission image because of respiratory motion causes errors in the attenuation correction factors and artifacts in the attenuation-corrected PET image. To rectify this problem, we ...

  9. CT number variations in micro CT imaging systems

    Science.gov (United States)

    Tu, Shu-Ju; Hsieh, Hui-Ling; Chao, Tsi-Chian

    2008-03-01

    CT numbers can be directly computed from the linear attenuation coefficients in the reconstructed CT images and are correlated to the electron densities of the chemical elements with specific atomic numbers. However, the computed CT numbers can be varied when different imaging parameters are used. Phantoms composed of clinically relevant and tissue-equivalent materials (lung, bone, muscle, and adipose) were scanned with a commercial circular-scanning micro CT imager. This imaging system is composed with a micro-focused x-ray tube and charged-coupled device (CCD) camera as the detector. The mean CT numbers and the corresponding standard deviations in terms of Hounsfield units were then computed from a pre-defined region of interest located within the reconstructed volumetric images. The variations of CT number were then identified from a series of imaging parameters. Those parameters include imaging acquisition modes (e.g., the metal filter used in the x-ray tube), reconstruction methods (e.g., Feldkamp and iterative algorithm), and post-image processing techniques (e.g., ring artifact, beam-hardening artifact, and smoothing processing). These variations of CT numbers are useful and important in tissue characterization, quantitative bone structure analysis, bone marrow density evaluation, and Monte Carlo dose calculations for the pilot small animal study when micro CT imaging systems are employed. Also these variations can be used as the quantification for the performance of the micro CT imaging systems.

  10. Comparison of CT numbers between cone-beam CT and multi-detector CT

    International Nuclear Information System (INIS)

    To compare the CT numbers on 3 cone-beam CT (CBCT) images with those on multi-detector CT (MDCT) image using CT phantom and to develop linear regressive equations using CT numbers to material density for all the CT scanner each. Mini CT phantom comprised of five 1 inch thick cylindrical models with 1.125 inches diameter of materials with different densities (polyethylene, polystyrene, plastic water, nylon and acrylic) was used. It was scanned in 3 CBCTs (i-CAT, Alphard VEGA, Implagraphy SC) and 1 MDCT (Somatom Emotion). The images were saved as DICOM format and CT numbers were measured using OnDemand 3D. CT numbers obtained from CBCTs and MDCT images were compared and linear regression analysis was performed for the density, ρ(g/cm3), as the dependent variable in terms of the CT numbers obtained from CBCTs and MDCT images. CT numbers on i-CAT and Implagraphy CBCT images were smaller than those on Somatom Emotion MDCT image (p<0.05). Linear relationship on a range of materials used for this study were ρ=0.001 H+1.07 with R2 value of 0.999 for Somatom Emotion, ρ=0.002 H+1.09 with R2 value of 0.991 for Alphard VEGA, ρ=0.001 H+1.43 with R2 value of 0.980 for i-CAT and ρ=0.001 H+1.30 with R2 value of 0.975 for Implagraphy. CT numbers on i-CAT and Implagraphy CBCT images were not same as those on Somatom Emotion MDCT image. The linear regressive equations to determine the density from the CT numbers with very high correlation coefficient were obtained on three CBCT and MDCT scan.

  11. Optimization of CT procedures

    International Nuclear Information System (INIS)

    Full text: In recent years computed tomography (CT) became a powerful diagnostic method. The technology advances in CT allowed improvement of the image quality, but set a number of challenges to all professionals working in the field of diagnostic imaging. CT capabilities expand, and thus increase the need for better training and qualification of staff and engineers responsible for the optimal functioning of the CT system. Despite the variety of technical innovations for dose reduction, obtaining of images with good diagnostic quality is often associated with increased dose. There is a lack of consensus in radiological practice about the use of contrast media and the image quality requirements. A common opinion is that the manufacturer setting is optimal. All this leads to large variations of doses for the same examinations and shows the need to optimize procedures. Learning objectives: optimization is not a single act but a process involving all the experts conducting the study. The presence of qualified medical physicist as a part of the team is important. Responsibility of the team is to choose which procedures have to be optimized. In most cases, the choice is between the most common procedures performed and those suspected in the diagnostic value of the image. Special attention should be paid to the study of children in order to exclude the use of protocols for adults, which leads to unnecessary high doses.each member of the team must be aware of the relationship between patient dose and image quality. the choice how to conduct the study depends on the diagnostic purpose. In some examinations, such as CT urography, obtaining high quality image at the cost of a higher dose does not improve the diagnostic outcome. On the other hand optimization is not necessarily associated with dose reduction. In cases where the images are not with adequate diagnostic quality, it is necessary to use a CT protocol with higher dose. Several international documents show the

  12. CT findings of automastoidectomy

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hyung Jin; Chung, Hae Gyeong; Kim, Jae Hyoung; Hwang, Eui Gee; Ma, Yong Woon; Chung, Sung Hoon [College of Medicine, Gyeongsang National University, Jinju (Korea, Republic of)

    1992-01-15

    Cholesteatoma of the middle ear and mastoid sometimes destroys the posterior wall of the external auditory canal(EAC), and this phenomenon is termed as 'automastoidectomy'. During the past two years the authors reviewed the CT features of automastoidectomy in eight patients with middle ear cholesteatoma, There was a variable amount of the cholesteatomatous mass or debris within the mastoid cavity in all patients, of whom air collection was found in four. Interestingly, the site and pattern of the erosion of the EAC were nearly identical between patients with air in the mastoid cavity and those without it. Air in the mastiod cavity was the only clue of the expulsion of the cholesteatoma. So, we think that the expulsion of the cholesteatoma might be predicted when the erosion of the EAC is present in patients with cholesteatoma in the mastoid cavity. CT clearly depicted associated complications caused by the cholesteatoma, such as ossicular destruction (n=8), the erosion of the facial nerve canal (n=2), the erosion of the lateral semicircular canal (n=2), the erosion of the tegmen (n=1), the erosion of the sigmoid sinus plate (n=1), the erosion of the superior semicircular canal (n=1), and the erosion of the vestibule (n=1). Although much of the natural history of the middle ear cholesteatoma still remains to be determined, we thick that careful evaluation of one type of possible progression of the disease will help us understand its clinical course. Moreover, our findings strongly support the use of CT for evaluation of 'automastoidectomy' seen in many cases of cholesteatoma.

  13. CT studies in hyperprolactinemia

    International Nuclear Information System (INIS)

    Computerized tomography studies in 62 patients (55 females and 7 males) with hyperprolactinemia are presented. The female patients had secondary amenorrhea and galactorrhea, whereas the male patients suffered from impotency, gynaecomastia and very rarely galactorrhea. In 39 cases CT revealed a pituitary adenoma (prolactinoma), in 14 cases of them microadenoma, as the cause of hormonal and clinical disturbances. In 21 cases an empty sella with rudimentary pituitary surrounded by cerebrospinal fluid or lack of pituitary mass were found. In one case suprasellar and intrasellar calcifications were present. (author)

  14. CT appearances of pleural tumours

    Energy Technology Data Exchange (ETDEWEB)

    Salahudeen, H.M. [Department of Radiology, Leeds Teaching Hospitals NHS Trust (United Kingdom)], E-mail: hmdsal@gmail.com; Hoey, E.T.D. [Department of Radiology, Leeds Teaching Hospitals NHS Trust (United Kingdom); Department of Radiology, Papworth Hospital, Cambridge (United Kingdom); Robertson, R.J.; Darby, M.J. [Department of Radiology, Leeds Teaching Hospitals NHS Trust (United Kingdom)

    2009-09-15

    Computed tomography (CT) is the imaging technique of choice for characterizing pleural masses with respect to their location, composition, and extent. CT also provides important information regarding invasion of the chest wall and surrounding structures. A spectrum of tumours can affect the pleura of which metastatic adenocarcinoma is the commonest cause of malignant pleural disease, while malignant mesothelioma is the most common primary pleural tumour. Certain CT features help differentiate benign from malignant processes. This pictorial review highlights the salient CT appearances of a range of tumours that may affect the pleura.

  15. Children, CT Scan and Radiation

    OpenAIRE

    Morteza Bajoghli; Farshad Bajoghli; Nazila Tayari; Reza Rouzbahani

    2010-01-01

    Children are more sensitive to radiation than adults. Computer-ized tomography (CT) consists of 25 % of all medical imaging. It was estimated that more than 2% of all carcinomas in the USA are due to CT scans. There is an ongoing focus on the reduction of CT scan radiation dose. Awareness about risk-benefits of CT has increased. Reduction of radiological exam is an important issue because the accumulation effects of radiation can be hazardous. In addition, proper protocol should be followed f...

  16. CT dosimetry and risk estimates

    International Nuclear Information System (INIS)

    Conventional approaches to CT dosimetry are inadequate because they fail to evaluate the risk to the patient. A risk related approach to CT dosimetry is developed which explicitly takes into account the non-uniform dose distribution in the body and the relative sensitivities of different organs and tissues. The principal radiological risks to patients undergoing CT examinations are the stochastic processes of carcinogenesis and genetic effects. Radiation risk estimates have been obtained for an EMI 5005 CT scanner by measuring the mean organ doses in a Rando phantom for CT studies on the head, chest, abdomen and pelvis. The application of these risk estimates to the population served by this CT scanner indicates that during the lifetime of the CT scanner, approximately 50,000 patients will undergo CT scanning and 60% will result in a positive diagnosis. The radiation detriment is estimated to be about 1 induced cancer and a negligible genetic effect. The radiation detriment is considerably smaller than the total detriment associated with contrast material used in 76% of the CT studies. (author)

  17. Practical pediatric abdominal CT

    International Nuclear Information System (INIS)

    This course is designed to help the radiologist in a hospital setting successfully approach abdominal CT in the infant and child. Emphasis is placed on techniques necessary for a high-quality examination of the upper abdomen, as applied to common pediatric problems such as trauma, tumor, and infection. Material is presented on technical considerations, including patient sedation, preparation, and potential pitfalls and helpful hints for imaging. An emphasis is placed on dynamic scanning with table incrementation. The section on trauma focuses on an approach to imaging the abdomen in the injured child, typical injuries, patterns of injury in the upper abdomen, and why CT is the best imaging modality for blunt upper abdominal trauma. The discussion of tumor imaging reviews the appearance of typical childhood neoplasia including Wilms tumor, neuroblastoma, non-Hodgkin and Burkitt lymphoma, and disseminated solid tumors such as rhabdomyosarcoma. The authors emphasize what to look for and where, both on initial and on later (for recurrences) examinations. The discussion of infection addresses detection of abscesses and occult infections in children, as well as imaging of abscesses prior to intervention

  18. CT in vascular pathologies

    Energy Technology Data Exchange (ETDEWEB)

    Bartolozzi, C.; Neri, E.; Caramella, D. [Diagnostic and Interventional Radiology Department of Oncology, University of Pisa, Via Roma 67, I-56100 Pisa (Italy)

    1998-06-02

    Since the introduction of helical scanners, CT angiography (CTA) has achieved an essential role in many vascular applications that were previously managed with conventional angiography. The performance of CTA is based on the accurate selection of collimation width, pitch, reconstruction spacing and scan delay, which must be modulated on the basis of the clinical issue. However, the major improvement of CT has been provided by the recent implementation of many post-processing techniques, such as multiplanar reformatting, shaded surface display, maximum intensity projections, 3D perspectives of surface and volume rendering, which simulate virtual intravascular endoscopy. The integration of the potentialities of the scanner and of the image processing techniques permitted improvement of: (a) the evaluation of aneurysms, dissection and vascular anomalies involving the thoracic aorta; (b) carotid artery stenosis; (c) aneurysms of abdominal aorta; (d) renal artery stenosis; (e) follow-up of renal artery stenting; and (f) acute or chronic pulmonary embolism. Our experience has shown that the assessment of arterial pathologies with CTA requires the integration of 3D post-processing techniques in most applications. (orig.) With 4 figs., 34 refs.

  19. Clinical value of CT perfusion imaging in assess of the efficiency of radiation therapy for lung cancer%16层螺旋CT灌注成像对肺癌放疗疗效评估的临床应用

    Institute of Scientific and Technical Information of China (English)

    张海兵; 金彪; 李君; 周柱玉

    2011-01-01

    目的 探讨16层螺旋CT肺灌注成像在肺癌放射治疗后疗效评估的临床应用价值.方法 对26例肺癌放射治疗前后行16层螺旋CT肺灌注成像.根据肿瘤强化的时间密度曲线(time-density curve,TDC),计算出病灶的灌注值(perfusion value,PV)、血容量(blood volume,BV)、最高增强值(peak enhancement intensity,PEI)、达峰值时间(time to peak,TTP).放疗后的3个月做常规CT检查,以观察肿瘤形态学变化.结果 19例肺癌放疗后,肿瘤PV、PEI值显著降低,TTP升高,放疗后瘤体组织显著缩小或消失,患者症状明显改善.7例放疗前后PV、BV、PE及TTP值均无显著变化,放疗后肿块形态变化不大,患者症状改善不明显.结论 CT灌注成像可定量评价肺癌放疗前后肿瘤血流灌注的改变,并可早期预测肿瘤的放射性治疗效果.%Objective To explore the value of CT perfusion imaging in prediction of lung cancer response to radiation therapy with 16-slice spiral CT. Methods Twenty-six cases with lung cancer underwent CT perfusion imaging with 16-slice spiral CT pre-and post-radiation therapy, the perfusion value(PV) ,blood volume(BV) peak enhancement intensity!PEI) and time to peak(TTP) were calculated based on the time-density curves (TDC) respectively. The unenhanced CT scans were performed to assess the morphologic changes of tumors three months after the radiation therapy. Results The PV.PEI values of the lesions in nineteen cases decreased significantly, while TTP values increased. All of 19 cases showed reduction in tumor volume or tumor dissolved in 3-month follow-up. The values of PV,BV,PE and TTP of the lesions in seven cases between pre-and post-radiation therapy showed no statistical differences, and the tumors in size changed little. Conclusion CT perfusion imaging plays a valuable role in assessment of the tumor-ous blood perfusion before and after the radiation therapy and it can enable us to predict the efficiency resulted from the radiation

  20. 多层螺旋CT在胃肠间质瘤定位和定性诊断中的价值%Values of multi-slice CT in differential diagnosis of gastrointestinal stromal tumors

    Institute of Scientific and Technical Information of China (English)

    卢文彬

    2014-01-01

    目的:探讨多层螺旋CT在胃肠道间质瘤( GIST)定位和定性中的诊断价值。方法:对本院30例手术病理证实为胃肠间质瘤的患者的CT影像特点进行回顾性分析。均行16层螺旋CT平扫和增强扫描,探讨病灶位置、大小及有无坏死等情况。结果:胃肠道间质瘤单发患者21例、多发9例;其中17例肿瘤部位在胃部、8例位于小肠、5例位于直肠。19例向腔内外同时生长、8例向腔外生长、3例向腔内生长。恶性GIST 强化不均匀,可有邻近脏器侵犯。16层螺旋CT定性准确率为83.3%(25/30)、定位准确率90.0%(27/30)。结论:CT 增强扫描有利于GIST的定位诊断及对肿瘤良恶性质的判断,能准确显示肿瘤的部位、形态、大小,是目前检查GIST的重要方法之一。%Objective:To investigate the diagnosis values of multi-slice CT ( MSCT ) on diagnosis of gastrointestinal stromal tumors ( GIST) . Methods:The CT characteristics of 30 tumors of pathological confirmed GIST in our hospital were retrospectively analyzed. All patients were scanned with unenhanced and enhanced 16-slice CT, and then the location, size and necrosis of lesions were analyzed. Results:Among all 30 cases, single lesions of GIST were 21 cases, and motile lesions of GIST were 9 cases. And 17 cases located at stomach, 8 cases at small intestine, and 5 cases at rectum. There were 19 cases simultaneously inside and outside the chamber, 8 cases of external cavity growth, and 3 cases of intracavity growth. The malignant GIST exhibited inhomogeneous enhancement and invasion to adjacent organs. Accuracy of 16-slice CT diagnosis for qualitative analysis was 83. 3% ( 25/30 ) and for location was 90. 0% ( 27/30 ) of GISTs. Conclusion: CT enhanced scan benefits the localization diagnosis of GIST and the determination of benign or malignant tumors. It could accurately show the location, form and size of tumors, which is one of the significant methods to examine

  1. A virtual spectral CT scanner

    International Nuclear Information System (INIS)

    Full text: Spectral computed tomography (sCT) brings a promise of improved tissue discrimination when compared to conventional CT. At the heart of this new technology are energy selective photon counting detectors (PCD) combined with theorics on how to select optimal energy bins for discriminating two or more materials. Several theories have been published on how to select these energy bins, but so far the diagnostic utility of optimised sCT has not been fully exploited. This work presents a first step towards a virtual sCT scanner based on the well bench marked BEAMnrc Monte Carlo code and the computer power of the University of Canterbury BlueFern supe computer. A computational model of a recently developed sCT scanner (MARS-CT) has been developed to produce virtual X-ray projection data through an imaging object. The energy and position of all transmitted photons impinging on the detector plane can be extracted without the additional complications introduced by non ideal behaviour (such as charge-sharing) of current detectors. The photons are grouped into selective energy bins to produce energy selective projection images of the imaging object (see Fig. I). This enables the comparison of conventional CT with optimised spectral CT. Furthermore, the virtual sCT scanner is an ideal tool to compare and evaluate the different theoretical models (which optimise different metrics) in terms of relevant clinical parameters such as image contrast. In further work we are planning to include the physical limitations of the detector so the virtual sCT scanner closely resembles the MARS CT scanner.

  2. CT of the skull base

    International Nuclear Information System (INIS)

    For the middle ear only the crus longus incudis and the stapedius still requires conventional tomography. This substitution of CT for classical tomography, welcome in itself is limited by financial considerations. However, when CT is necessary it should be done before tomography thus possibly limiting both expense and radiation dose. (orig./AJ)

  3. Children's (Pediatric) CT (Computed Tomography)

    Science.gov (United States)

    ... not fit into the opening of a conventional CT scanner or may be over the weight limit—usually 450 pounds—for the moving table. Other imaging methods such as ultrasound or magnetic resonance (MR) imaging ... obtained by CT scanning. Working together, your primary care physician or ...

  4. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... image recording plate . Bones appear white on the x-ray; soft tissues show up in shades of gray and ... of CT is its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many ...

  5. Three-Section Expiratory CT:

    DEFF Research Database (Denmark)

    Loeve, Martine; de Bruijne, Marleen; Hartmann, Ieneke C. J.;

    2012-01-01

    Purpose: To estimate the effect of the number of computed tomography (CT) sections on trapped air (TA) assessment in patients with cystic fibrosis (CF) by using an established scoring system and a new quantitative scoring system and to compare CT and pulmonary function test (PFT) estimates of TA...

  6. Cardiac Computed Tomography (Multidetector CT, or MDCT)

    Science.gov (United States)

    ... Blood Pressure Tools & Resources Stroke More Cardiac Computed Tomography (Multidetector CT, or MDCT) Updated:Sep 3,2015 What is Computerized Tomography (CT)? CT is a noninvasive test that uses ...

  7. 低剂量CT扫描颅内出血性疾病%Low-dose CT Scanning of Intracranial Hemorrhagic Disease

    Institute of Scientific and Technical Information of China (English)

    魏应敏; 毛存南

    2014-01-01

    Objective To explore the application of low-dose CT scanning in intracranial hemorrhagic disease. To study the feasibility of low-dose scans in the clinical diagnosis. Methods German Siemens 16-slice spiral CT was used. The scanning dose was reduced by reducing the tube current. 60 cases with intracranial bleeding diseases underwent CT scanning. 30 patients underwent conventional CT scanning, and another 30 cases underwent low-dose CT scanning. Low-dose CT images were compared to the first checked images to evaluate the development of hemorrhagic disease, and compared with conventional CT scanning images. Results Compared with the first scanning images, low-dose CT scanning images showed no significant difference, and the quality of images did not affect the display of lesions and diagnosis. There was no significant difference compared to conventional CT images. Conclusion The patient's radiation dose was significantly reduced by low-dose CT scanning. As a result of low-dose scanning, the consumption of CT machine was also reduced, which could greatly increase the life of machine.%目的:探讨低剂量CT扫描在颅内出血性疾病复查时扫描的应用价值。并研究低剂量扫描在临床诊断中的可行性。方法采用德国西门子公司生产的16排螺旋CT,通过降低管电流来降低扫描剂量,对60例颅内出血性疾病患者复查扫描。其中30例采用常规扫描,另外30例采用低剂量扫描。将低剂量扫描的图像与首次检查图像比较,评价出血性疾病的发展情况。再与常规扫描比较影像学差异。结果低剂量CT扫描所获得的图像清晰,与首次扫描的图像相比,对比度、病灶边缘显示无明显差异,不影响病灶的显示和诊断结果。与常规扫描图像无明显影像学差异。结论低剂量CT扫描对病人的辐射剂量大大降低了。由于采用低剂量扫描,CT机器的消耗也降低了,大大增加了机器的使用寿命。

  8. Innovations in PET/CT

    DEFF Research Database (Denmark)

    Levin Klausen, T; Høgild Keller, S; Vinter Olesen, O;

    2012-01-01

    impressive anatomical details. PET/CT designs are facing many challenges such as the conversion of CT numbers to attenuation coefficients, giving rise to artefacts due to the presence of high Zeff material. Patient motion during scans degrades image quality and subsequent analysis, and is a challenge......There has been a longstanding interest in positron emission tomography (PET) in combination with computed tomography (CT). Mostly because of the lack of structural information in PET which makes it difficult to assess the precise location of tissue with metabolic uptake, whereas CT can provide...... especially as spatial resolution improves. Software based image fusion remains a complex issue outside the brain. State of the art image quality in a modern PET/CT system includes incorporation of point spread function (PSF) and time-of-flight (TOF) information into the reconstruction leading to the high...

  9. The stylohyoid chain: CT imaging

    Energy Technology Data Exchange (ETDEWEB)

    Uysal Ramadan, Selma, E-mail: uysalselma@yahoo.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Goekharman, Dilek, E-mail: gokharman@ttnet.net.t [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kosar, Pinar, E-mail: pkosar@hotmail.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kacar, Mahmut, E-mail: mkacar1961@gamil.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kosar, Ugur, E-mail: ugurkosar@hotmail.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey)

    2010-09-15

    We aimed in this report to discuss the embryology, anatomy, theories of ossification and symptoms, clinical presentation, and diagnosis of the stylohyoid chain (SHC) variations, together with the role of radiographs, computed tomography (CT) and three-dimensional (3D)-CT in showing these variations. Because CT/3D-CT additionally facilitates visualization of the entire SHC with different axes, it is the most valuable method for establishing the relationship between the SHC and the surrounding tissue. SHC variation can be discovered during CT performed for indications other than ossified SHC. It is important to diagnose whether or not the SHC is ossified, since one of the treatment procedures in ossified SHC is total excision. If the clinician and radiologist are aware of these variations observed in the SHC, patients with vague symptoms may be spared unnecessary investigations and may be properly diagnosed earlier.

  10. CT- and MR colonography

    DEFF Research Database (Denmark)

    Achiam, Michael Patrick; Bülow, Steffen; Rosenberg, J

    2002-01-01

    BACKGROUND: Colorectal cancer is the second most frequent cancer and adenomas are widely accepted as precursors to colorectal cancer. Diagnosis and removal of adenomas are recommended to reduce cancer incidence and mortality. The current diagnostic methods include sigmoidoscopy and colonoscopy...... in the supine and prone positions. Data are then downloaded to a workstation for post processing and image-analysis. RESULTS: Results have shown a high sensitivity and specificity for polyps > or = 10 mm, comparable to the sensitivity of conventional colonoscopy and superior to double contrast barium enema...... colonography. Future developments with the use of "intelligent" computers, better resolution and faster examinations will make CT and/or MR colonography realistic options to replace conventional diagnostic colonoscopy....

  11. Thoracic textilomas: CT findings

    International Nuclear Information System (INIS)

    Objective: the aim of this study was to analyze chest CT scans of patients with thoracic textiloma. Methods: this was a retrospective study of 16 patients (11 men and 5 women) with surgically confirmed thoracic textiloma. The chest CT scans of those patients were evaluated by two independent observers, and discordant results were resolved by consensus. Results: the majority (62.5%) of the textilomas were caused by previous heart surgery. The most common symptoms were chest pain (in 68.75%) and cough (in 56.25%). In all cases, the main tomographic finding was a mass with regular contours and borders that were well-defined or partially defined. Half of the textilomas occurred in the right hemithorax and half occurred in the left. The majority (56.25%) were located in the lower third of the lung. The diameter of the mass was ≤ 10 cm in 10 cases (62.5%) and > 10 cm in the remaining 6 cases (37.5%). Most (81.25%) of the textilomas were heterogeneous in density, with signs of calcification, gas, radiopaque marker, or sponge-like material. Peripheral expansion of the mass was observed in 12 (92.3%) of the 13 patients in whom a contrast agent was used. Intraoperatively, pleural involvement was observed in 14 cases (87.5%) and pericardial involvement was observed in 2 (12.5%). Conclusions: it is important to recognize the main tomographic aspects of thoracic textilomas in order to include this possibility in the differential diagnosis of chest pain and cough in patients with a history of heart or thoracic surgery, thus promoting the early identification and treatment of this postoperative complication. (author)

  12. Holoprosencephaly and CT

    Energy Technology Data Exchange (ETDEWEB)

    Asada, M.; Tamaki, N.; Ebara, K.; Shirakuni, T.; Yamashita, H. (Kobe Univ. (Japan). School of Medicine)

    1981-02-01

    Holoprosencephaly, so termed by DeMyer, is a cerebral malformation in which the prosencephalon fails to divide into cerebral hemispheres early in fetal life. According to the degree of division in the prosencephalon and the presence of the associated facial anomalies, he classified holoprosencephaly into three types; alobar, semilobar, and lobar. We have had experience with six cases with holoprosencephaly: one alobar, one semilobar, and four lobar. No significant facial abnormalities were found in any case, but one had hyperterolism. All cases had hydrocephalus and had undergone an operation for a ventriculo-peritoneal shunt. The outcome of the shunt operation in two cases with alobar and semilobar holoprosencephaly was miserable. On the other hand, the cases with lobar type showed a fairly good prognosis. They were only mildly mentally retarded on a follow-up examination. It seemed, therefore, that the ventriculo-peritoneal shunt is indicated for this lobar type of holoprosencephaly. For this reason, it is important to make a precise diagnosis before any shunt operation. CT is a useful and safe diagnostic procedure for evaluating the intracranial structures of holoprosencephaly: the degree of division in the prosencephalon, the ventricular configuration, the dorsal sac, and the absence of falx. When the hydrocephalus associated with this disease is severe, the interhemispheric fissure is not clearly delineated, and it may sometimes be difficult to differentiate the semilobar from the lobar type of holoprosencephaly. The course of the azygos anterior cerebral artery on angiograms is useful in distinguishing one from the other. It is hoped that a multi-directional approach on CT will reveal a more precise structure of holoprosencephaly and that a definitive diagnosis can be made without angiography or other invasive procedures.

  13. Thoracic textilomas: CT findings

    Energy Technology Data Exchange (ETDEWEB)

    Machado, Dianne Melo; Zanetti, Glaucia; Araujo Neto, Cesar Augusto; Nobre, Luiz Felipe; Meirelles, Gustavo de Souza Portes; Silva, Jorge Luiz Pereira e; Guimaraes, Marcos Duarte; Escuissato, Dante Luiz; Souza Junior, Arthur Soares; Hochhegger, Bruno; Marchiori, Edson, E-mail: edmarchiori@gmail.com [Hospital Universitario Antonio Pedro (HUAP/UFF), Niteroi, RJ (Brazil)

    2014-09-15

    Objective: the aim of this study was to analyze chest CT scans of patients with thoracic textiloma. Methods: this was a retrospective study of 16 patients (11 men and 5 women) with surgically confirmed thoracic textiloma. The chest CT scans of those patients were evaluated by two independent observers, and discordant results were resolved by consensus. Results: the majority (62.5%) of the textilomas were caused by previous heart surgery. The most common symptoms were chest pain (in 68.75%) and cough (in 56.25%). In all cases, the main tomographic finding was a mass with regular contours and borders that were well-defined or partially defined. Half of the textilomas occurred in the right hemithorax and half occurred in the left. The majority (56.25%) were located in the lower third of the lung. The diameter of the mass was ≤ 10 cm in 10 cases (62.5%) and > 10 cm in the remaining 6 cases (37.5%). Most (81.25%) of the textilomas were heterogeneous in density, with signs of calcification, gas, radiopaque marker, or sponge-like material. Peripheral expansion of the mass was observed in 12 (92.3%) of the 13 patients in whom a contrast agent was used. Intraoperatively, pleural involvement was observed in 14 cases (87.5%) and pericardial involvement was observed in 2 (12.5%). Conclusions: it is important to recognize the main tomographic aspects of thoracic textilomas in order to include this possibility in the differential diagnosis of chest pain and cough in patients with a history of heart or thoracic surgery, thus promoting the early identification and treatment of this postoperative complication. (author)

  14. Optimization of Protocol CT, PET-CT, whole body

    International Nuclear Information System (INIS)

    The objective of this study was to optimize the acquisition protocols and processing existing of the CT PET/CT scanner for clinical use of Nuclear Diagnostic Center Foundation, a way to minimize the radiation dose while maintaining diagnostic image quality properly. Dosimetric data of PET / CT service were surveyed and obtained the baseline against which we compare and define strategies and modifications to develop online. We selected transaxial up to the pulmonary hilum and liver slices as the anatomical regions of interest that led to the standardization of the study

  15. Optimization of Protocol CT, PET-CT, whole body; Optimizacion de protocolo CT, en PET-CT, de cuerpo entero

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez, Fredys Santos, E-mail: fsantos@ccss.sa.cr [Caja Costarricense de Seguro Social (ACCPR/CCSS), San Jose (Costa Rica). Area Control de Calidade Y Proteccion Radiologica; Namias, Mauro, E-mail: mnamias@gmail.com [Comision Nacional de Energia Atomica (FCDN/CNEA), Buenos Aires (Argentina). Fundacion Centro Diagnostico Nuclear

    2013-11-01

    The objective of this study was to optimize the acquisition protocols and processing existing of the CT PET/CT scanner for clinical use of Nuclear Diagnostic Center Foundation, a way to minimize the radiation dose while maintaining diagnostic image quality properly. Dosimetric data of PET / CT service were surveyed and obtained the baseline against which we compare and define strategies and modifications to develop online. We selected transaxial up to the pulmonary hilum and liver slices as the anatomical regions of interest that led to the standardization of the study.

  16. CT features of retroperitoneal neurilemmoma

    Energy Technology Data Exchange (ETDEWEB)

    Kinoshita, T.; Ishii, K. [Department of Radiology, Sendai City Hospital, 3-1 Shimizukouji, Wakabayashi-ku Sendai 984 (Japan); Naganuma, H. [Department of Pathology, Sendai City Hospital, 3-1 Shimizukouji, Wakabayashi-ku, Sendai 984 (Japan); Itoh, H. [Department of Radiology, Miyagi Prefectural Semine Hospital, 55-2 Funegishi, Semine 989-45 (Japan)

    1998-03-01

    Purpose: The aim of this study was to characterize the CT features of retroperitoneal neurilemmoma. Methods: The CT findings were reviewed in seven patients with retroperitoneal neurilemmoma. Results: All of the tumours were well-demarcated round or oval masses. In five cases, heterogeneous contrast enhancement was noted after contrast medium administration. Areas of minimal enhancement reflected diffuse edema in one tumour. Areas without definite enhancement represented prominent cyst formation in three tumours. There were three cases with tumour calcification (two with punctate calcification and one with mottled calcification). Conclusion: CT findings may suggest the diagnosis of retroperitoneal neurilemmoma preoperatively. (Copyright (c) 1998 Elsevier Science B.V., Amsterdam. All rights reserved.)

  17. CT perfusion in acute stroke

    International Nuclear Information System (INIS)

    Stroke is a heterogeneous syndrome caused by multiple mechanisms, all of which result in disruption of normal cerebral blood flow and thereby cause cerebral dysfunction. Its early diagnosis is important as its treatment is dependent on the time elapsed since ictus. Delay in diagnosis and treatment translates into increase neuronal loss and thereby increased morbidity. CT scan, and in particular perfusion CT, has helped greatly in the early diagnosis of stroke. This article is an endeavor to explain the pathophysiology of cerebral ischemia and the role of CT perfusion in detecting it

  18. Intracranial tuberculoma: CT and MRI

    International Nuclear Information System (INIS)

    The appearances of intracranial tuberculoma on CT and MRI are described. Eight patients (6 males and 2 females) with intracranial tuberculomas studied over the past 4 years are presented. Four patients had AIDS and among the four non-AIDS patients 1 had undergone hepatic transplantation. All the cases were studied with CT and 6 underwent MRI. Five lesions were infratentorial, and 2 patients had double lesions. In 2 patients obstructive triventricular hydrocephalus was present. No patient had meningeal involvement. The stage of evolution was cerebritis in 1 case, incipient tuberculoma in 3 cases, mature tuberculoma in 1 case and tuberculous abscess in 5 cases. Diagnosis of intracranial tuberculoma was determined histologically in 5 patients and by good response to specific therapy in the remaining patients. Although CT allows differentiation between incipient and mature tuberculoma, MRI allows a better determination of the evolutonary stage. In most cases combined CT and MRI examinations provide an accurate diagnosis of intracranial tuberculoma. (orig.)

  19. Intracranial tuberculoma: CT and MRI

    Energy Technology Data Exchange (ETDEWEB)

    Bargallo, N. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain); Berenguer, J. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain); Tomas, X. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain); Nicolau, C. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain); Cardenal, C. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain); Mercader, J.M. [Dept. of Radiology, Hospital Clinic i Provincial de Barcelona (Spain)

    1993-04-01

    The appearances of intracranial tuberculoma on CT and MRI are described. Eight patients (6 males and 2 females) with intracranial tuberculomas studied over the past 4 years are presented. Four patients had AIDS and among the four non-AIDS patients 1 had undergone hepatic transplantation. All the cases were studied with CT and 6 underwent MRI. Five lesions were infratentorial, and 2 patients had double lesions. In 2 patients obstructive triventricular hydrocephalus was present. No patient had meningeal involvement. The stage of evolution was cerebritis in 1 case, incipient tuberculoma in 3 cases, mature tuberculoma in 1 case and tuberculous abscess in 5 cases. Diagnosis of intracranial tuberculoma was determined histologically in 5 patients and by good response to specific therapy in the remaining patients. Although CT allows differentiation between incipient and mature tuberculoma, MRI allows a better determination of the evolutonary stage. In most cases combined CT and MRI examinations provide an accurate diagnosis of intracranial tuberculoma. (orig.)

  20. Multiplanar CT of the spine

    Energy Technology Data Exchange (ETDEWEB)

    Rothman, S.L.G.; Glenn, W.V. Jr.

    1986-01-01

    This is an illustrated text on computed tomography (CT) of the lumbar spine with an emphasis on the role and value of multiplanar imaging for helping determine diagnoses. The book has adequate discussion of scanning techniques for the different regions, interpretations of various abnormalities, degenerative disk disease, and different diagnoses. There is a 50-page chapter on detailed sectional anatomy of the spine and useful chapters on the postoperative spine and the planning and performing of spinal surgery with CT multiplanar reconstruction. There are comprehensive chapters on spinal tumors and trauma. The final two chapters of the book are devoted to CT image processing using digital networks and CT applications of medical computer graphics.

  1. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... particularly the lungs, abdomen, pelvis and bones. Sometimes ultrasound is substituted for CT as a method of ... to consider other tests, such as MRI or ultrasound which might give the same information. Other measures ...

  2. Children, CT scan and radiation

    Directory of Open Access Journals (Sweden)

    Morteza Bajoghli

    2010-01-01

    Full Text Available Children are more sensitive to radiation than adults. Computer-ized tomography (CT consists of 25 % of all medical imaging. It was estimated that more than 2% of all carcinomas in the USA are due to CT scans. There is an ongoing focus on the reduction of CT scan radiation dose. Awareness about risk-benefits of CT has increased. Reduction of radiological exam is an important issue because the accumulation effects of radiation can be hazardous. In addition, proper protocol should be followed for diagnostic pro-cedures of ionization radiation and computerized tomography. Effective radiation dose should range from 0.8 to 10.5 millisievert. The same protocol should be followed in different hospitals as well. Basic principles of radiation protection should be monitored. As much as possible, both technician and radiologist must be pre-sent during computerized tomography for children, and MRI and ultrasound should be replaced if possible.

  3. Multiple myeloma: evaluation by CT

    International Nuclear Information System (INIS)

    Although patients who have multiple myeloma usually have straightforward clinical symptoms and corroborative radiographs, in some instances, these patients will present atypically, with symptoms suggesting active disease but radiographs that are normal or nonspecific. The authors reviewed the records of 32 patients who had documented multiple myeloma and had undergone CT examinations, assessing the value of those examinations. Although CT is not indicated in all patients who have multiple myeloma, it is especially useful in patients who have bone pain and normal or nonspecific radiographs. CT provided confirmatory information in all cases in which lesions were seen on radiographs. CT also frequently demonstrated a greater extent of disease than could be appreciated on the radiographs

  4. Principles of viewing in CT

    International Nuclear Information System (INIS)

    Colour CT should not be routinely used but be reserved for certain cases presenting difficulties of interpretation and for certain types of images. However, side by side viewing in monochrome and colour is of considerable diagnostic interest. (orig./AJ)

  5. Your Radiologist Explains CT Colonography

    Medline Plus

    Full Text Available ... Pediatric Ultrasound Video: Angioplasty & vascular stenting Video: Arthrography Radiology and You About this Site RadiologyInfo.org is ... Explains CT Colonography (Virtual colonoscopy) Transcript Welcome to Radiology Info dot org! Hi, I’m Dr. Elliot ...

  6. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... create detailed images of your child’s internal organs, bones, soft tissues and blood vessels. It may be ... CD or DVD. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater ...

  7. CT findings of muscular dystrophy

    International Nuclear Information System (INIS)

    CT scans of muscles in patients with limb girdle type (LG), myotonic type (MYD) and Duchenne type (DMD) dystrophies were obtained at five different body levels: the neck, L3 vertebral body, pelvic girdle, thigh and lower leg. CT numbers, cross sectional areas (CSA) and %CSA of muscle or fat were evaluated in each muscle. The characteristic CT patterns for each type of muscular dystrophy were obtained. Compared with DMD, the gracilis and soleus were more severely damaged in LG and the biceps femoris remained relatively preserved among the hamstrings. In addition, the multifidus of the neck and sternocleidomastoid also were more severely damaged in MYD. This study suggests that CT scan will be useful in the differential diagnosis of these types of muscular dystrophy as well as in planning appropriate rehabilitation and detecting damaged muscles. (author)

  8. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... its ability to image bone, soft tissue and blood vessels all at the same time. Unlike conventional x-rays, CT scanning provides very detailed images of many types of tissue as well as the lungs, bones, ...

  9. Children's (Pediatric) CT (Computed Tomography)

    Medline Plus

    Full Text Available ... a CT or CAT scan, is a diagnostic medical test that, like traditional x-rays, produces multiple ... your doctor of any recent illnesses or other medical conditions your child may have, and if there ...

  10. Your Radiologist Explains CT Colonography

    Medline Plus

    Full Text Available ... this Site RadiologyInfo.org is produced by: Image/Video Gallery Your Radiologist Explains CT Colonography (Virtual colonoscopy) ... Recently posted: Focused Ultrasound for Uterine Fibroids Dementia Video: General Ultrasound Video: Pediatric Nuclear Medicine Radiology and ...