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Sample records for two-dimensional color doppler

  1. Diagnosis of asymptomatic atrial septal aneurysms using two-dimensional color Doppler and contrast transthoracic echocardiography

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Objective To evaluate the dimensions of atrial septal aneurysm (ASA), the presence and characteristics of interatrial shunt, the movement of the wall of the aneurysm, and correlation between these findings and sign and/or symptoms suggesting embolism in Manisa, a district of a western Anatolian city of Turkey. Methods Two thousand five hundred cases were examined by routine transthoracic echocardiography (TTE) in both pediatric and adult cardiology outpatient clinics. ASA was detected in 20 cases and evaluated by two-dimensional color Doppler echocardiography (CDE). The length of the base, the maximum radius and the maximum displacement of ASA were measured. The shunt between the atria was examined by CDE. In cases where a shunt could not be found, galactose and palmitic acid was injected. Standard 12-lead electrocardiogram (ECG) and exercise stress test were also performed. Results No clinical signs or symptoms were found, suggesting a systemic or cerebral embolism. The maximum displacement of ASA was between 2 and 5 mm. All of the aneurysms were localized in the right atrium, and the walls of the aneurysm did not move beyond the base of the left atrium during the maximum displacement. Interatrial shunt was detected in 14 of 20 patients (70%) by CDE and in the remaining six cases by contrast TTE. Frequent ventricular ectopic beats were observed in one patient. Conclusions During routine TTE we observed 0.8% asymptomatic ASA in our population. The use of a contrast agent was found to be a valuable additional method in patients with ASA when the shunt could not be detected by CDE. The risk for embolism is not high when the maximum displacement of the wall of ASA was 5 mm or less and no bulge into the left atrium was observed. Based on our experience with this method, TTE is easy to perform, well-tolerated and acceptable.

  2. [Diagnosis of placenta previa accreta by two dimensional ultrasonography and color doppler in patients with cesarean section].

    Science.gov (United States)

    Shi, Huafang; Pi, Pixiang; Ding, Yiling

    2012-09-01

    To determine the accuracy of two dismensional sonography and color doppler in diagnosing placenta previa accreta in patients with previous cesarean section. Forty-one patients with previous cesarean sections were confirmed to have partial or total placenta previa in the current pregnancy and were given ultrasound examinations after the 28th week of gestation. Specific ultrasound features of the placenta and its interphase with the uterus and the bladder for placenta accreta were checked by two-dimensional ultrasonography and color Doppler. All the patients were traced until delivery. The golden standard in diagnosis was the intraoperative finding and the pathologic exam. Twenty-two patients had ultrasonographic evidence of placenta previa, 20 of which were later confirmed placenta previa accreta intraoperatively. Nineteen patients had no ultrasound evidence of placenta previa, and 1 of which was later confirmed placenta previa accreta. The sensitivity and specificity of antenatal ultrasound diagnosis of placenta previa accreta were 95.24% and 94.74% respectively. The most prominent feature to suggest placenta accreta in twodismensional sonography was the presence of multiple lakes that represented dilated vessels extending from the placenta through the myometrium. The most prominent color Doppler feature was the presence of interphase hypervascularity with abnormal vessels linking the placenta to the bladder, and the rate was 95.24%. Placenta previa accreta can be diagnosed made with a thorough two dimensional ultrasonographic and color Doppler examination in patients with previous cesarean scar and placenta previa.

  3. 二维和彩色多普勒超声诊断睾丸损伤%Two-dimensional and color Doppler ultrasonographic diagnosis for injury of testis

    Institute of Scientific and Technical Information of China (English)

    徐卫东; 刘牧; 耿兰溪; 栾智勇; 邓凯丽

    2001-01-01

    目的评价彩色多普勒超声(CDU)对睾丸损伤的诊断价值及临床治疗的指导意义。方法用CDU检测26例(27只)受伤睾丸的形态学及血流动力学改变,根据声像图特征将受伤睾丸分为四型:挫伤型、血肿型、破裂型、脱位型。结果 26例睾丸损伤的超声分型:挫伤型4例,血肿型7例,破裂型15例,脱位型1例。手术治疗22例,超声分型与手术对照符合率为 95.7%。结论 CDU检测简便易行,准确可靠,是睾丸损伤的首选检诊方法,睾丸损伤的超声分型与病理改变相接近,便于指导临床处理。%Objective To evaluate the diagnostic value and the instructive importance to the clinic treatment of color Doppler ultrasonography (CDU) in the injury of testis.Methods The morpholical and homodynamic changes of 27 injuried testes ( 26 patients ) were observed with CDU. On the basis of the features of CDU appearances, the injuried testes were divided into 4 types (blunt, hematoma, rupture and dislocation types ).Results By the types of CDU, 4,7,15 and 1 of 27 injuried testes were respectively classified for blunt, hematoma, rupture and dislcoation types. 22 of the patients underwent surgery.The coincident rate between CDU and pathologic diagnoses of 23 injuried testes performed operation was 95.7%(22/23).Conclusions Typing diagnosis with CDU in injuried testes is a simple, easy, accurate and reliable method and should become a first choice method in diagnosing testicular injury. Moreover, because the ultrasonic type and the pathologic changes of injuried testes was coincident,this method may be contribute to the clinical treatment of injuried testes.

  4. Double mitral valve orifice. Two-dimensional and Doppler echocardiographic diagnosis.

    Science.gov (United States)

    Solorio, S; Badui, E; Yáñez, M; Enciso, R; Rodríguez, L; Quintero, L R

    1996-01-01

    The purpose of this study was to demonstrate the usefulness of two-dimensional and Doppler echocardiography for diagnosing double mitral valve orifices (DMVO) in addition to identifying associated pathologies. We report five cases, three male and two female with an age ranging from 4 to 44 years old (mean age: 17 years), with the diagnosis of DMVO according to the following characteristics: using two-dimensional echocardiography on the short parasternal axis, both orifices were observed; apical in which the "seagull sign" was identified in both chambers, in addition to identifying the flows of each orifice by pulsed and codified color Doppler obtaining the corresponding gradients. With respect to the associated pathologies, all patients presented some type of malformation, such as subaortic ring, patent ductus arteriosus, coarctation of the aorta, bicuspid aorta and pulmonary stenosis. Using the color Doppler echocardiography allows an adequate anatomical and functional definition of DMVO.

  5. 二维彩色多普勒超声在男性不育症诊断中的价值%The value of two-dimensional color Doppler ultrasonography in diagnosis male infertility

    Institute of Scientific and Technical Information of China (English)

    秦虹; 薄立伟; 王蕾

    2013-01-01

    目的:探讨二维彩色多普勒超声诊断前列腺、精囊腺等疾病致男性不育症的临床价值。方法对临床诊断为男性不育症的126例患者行二维及彩色多普勒超声检查,重点观察前列腺、睾丸、附睾、精索的形态及血流动力学情况。结果126例男性不育症患者,二维彩色多普勒超声检查可检出生殖系统多种病症及合并症,主要包括前列腺炎31例,前列腺发育不良3例,前列腺囊肿7例;精囊炎17例,精囊萎缩并钙化2例,精囊腺发育不良2例、精囊囊性畸形结构1例;射精管囊肿5例;慢性睾丸炎19例,睾丸微小结石症14例;慢性附睾炎22例,附睾囊肿36例;精索静脉曲张48例。结论二维及彩色多普勒超声检查可作为男性不育症的首选辅助检查方法。%Objective To explore the diagnostic value of two-dimensional color Doppler ultrasonography for prostate, seminal vesicles and other diseases caused male infertility. Methods 126 patients who had been clinically diagnosed as male infertility will be examined by two-dimensional color Doppler ultrasonography, the shape and blood stream of prostate, testis, epididymis and spermatic cord were emphatically observed. Results A variety of ailments and complications of the reproductive system were detected by 2D-CDU among 126 cases of male infertility patients, including prostatitis(31 cases), prostatic dysplasia(3 cases), prostate cyst(7 cases), seminal vesicle atrophy and calcification(17 cases), seminal(2 cases)vesicles dysplasia(2 cases), cystic seminal vesicle deformities(1 cases), ejaculatory duct cysts(5 cases), chronic orchitis(19 cases), testicular microlithiasis(14 cases), chronic epididymitis(22 cases), epididymal cysts(36 cases), varicocele(48 cases), etc. Conclusion Color Doppler ultrasonography can be used as the first choice of male infertility secondary screening method.

  6. Volumetric display containing multiple two-dimensional color motion pictures

    Science.gov (United States)

    Hirayama, R.; Shiraki, A.; Nakayama, H.; Kakue, T.; Shimobaba, T.; Ito, T.

    2014-06-01

    We have developed an algorithm which can record multiple two-dimensional (2-D) gradated projection patterns in a single three-dimensional (3-D) object. Each recorded pattern has the individual projected direction and can only be seen from the direction. The proposed algorithm has two important features: the number of recorded patterns is theoretically infinite and no meaningful pattern can be seen outside of the projected directions. In this paper, we expanded the algorithm to record multiple 2-D projection patterns in color. There are two popular ways of color mixing: additive one and subtractive one. Additive color mixing used to mix light is based on RGB colors and subtractive color mixing used to mix inks is based on CMY colors. We made two coloring methods based on the additive mixing and subtractive mixing. We performed numerical simulations of the coloring methods, and confirmed their effectiveness. We also fabricated two types of volumetric display and applied the proposed algorithm to them. One is a cubic displays constructed by light-emitting diodes (LEDs) in 8×8×8 array. Lighting patterns of LEDs are controlled by a microcomputer board. The other one is made of 7×7 array of threads. Each thread is illuminated by a projector connected with PC. As a result of the implementation, we succeeded in recording multiple 2-D color motion pictures in the volumetric displays. Our algorithm can be applied to digital signage, media art and so forth.

  7. 二维及彩色多普勒超声对甲状腺乳头状癌的诊断价值%Application of two-dimensional and color Doppler ultrasonography in diagnosis of papillary thyroid carcinoma

    Institute of Scientific and Technical Information of China (English)

    张华伟; 张志文; 梁波

    2012-01-01

    目的 探讨二维及彩色多普勒超声对甲状腺乳头状癌(PTC)的诊断价值.方法 回顾性分析经病理组织学证实的283个PTC和526个甲状腺良性结节的超声表现,对2组结节的各项超声表现的差异进行统计学分析,并分别计算其诊断的敏感性、特异性及准确性.结果 边缘毛糙(敏感性65.3%、特异性91.4%、准确性82.3%)、形态不规则(敏感性61.8%、特异性93.3%、准确性82.3%)、结节纵横比≥1(敏感性65.7%、特异性95.4%、准确性85.0%)、结节内部呈低回声或极低回声(敏感性79.5%、特异性.93.0%、准确性88.3%)、结节内部含微钙化(敏感性69.3%、特异性97.5%、准确性87.6%)、伴颈部淋巴结肿大(敏感性20.1%、特异性96.0%、准确性69.5%)以及结节内部血流信号丰富(敏感性26.1%、特异性93.3%、准确性69.8%)在恶性组中的检出率均较高,与对照组相比差异有统计学意义(P<0.05).PTC合并正常甲状腺者32例(17.9%),合并甲状腺腺瘤者12例(6.7%),合并结节性甲状腺肿者58例(32.4%),合并桥本甲状腺炎者77例(43.0%),合并桥本甲状腺炎者最多.结论 边缘毛糙、形态不规则,结节纵横比≥1、结节内部呈低回声或极低回声及结节内部含微钙化等指标的诊断准确性较高,是诊断PTC的重要指标,伴颈部淋巴结肿大及结节内部血流信号丰富的敏感性、准确性低但特异性较高,可作为鉴别诊断的参考指标,当桥本甲状腺炎合并可疑结节时更应警惕恶性可能.%Objective To investigate the value of two-dimensional and color Doppler ultrasonography in diagnosis of papillary thyroid carcinoma(PTC). Methods The ultrasonic characteristics of 283 PTC and 526 thyroid benign nodules were retrospectively reviewed. All masses were confirmed hy pathology. The different ultrasonic characteristics were analyied statistically. Sensitivity, specificity and accuracy were

  8. 彩色多普勒超声联合二维超声和三维超声TUI对胎儿唇腭裂畸形的临床诊断%Joint Two-dimensional Ultrasound and Color Doppler Ultrasound 3 d Ultrasound TUI Clinical Diagnosis of Fetal Cleft Lip and Palate Deformities

    Institute of Scientific and Technical Information of China (English)

    杨君梅; 马晓芹; 张春云; 王瑶

    2016-01-01

    Objective:To explore the application of fetal cleft lip and palate malformation joint two-dimensional ultrasound and color Doppler ultrasound 3 d ultrasound technology TUI diagnosis of clinical significance.Method:From May 2015 to May 2016 obstetric delivery in our clinical data of 60 children with cleft lip and palate deformities were analyzed retrospective,all children before birth to joint two-dimensional color Doppler ultrasonic ultrasonic testing joint two-dimensional ultrasound and color Doppler flow imaging,the technology of three-dimensional ultrasound TUI diagnosis, analysis and summarize the diagnosis of fetal cleft lip and palate deformities in ultrasonic image characteristics,two joint diagnosis scheme and actual results the coincidence rate of postpartum were observed.Result:4 cases of induced labor,56 cases of natural childbirth.16 cases with cleft lip, 3 cases wereⅠ degree,7 cases wereⅡ degree,6 cases wereⅢ degree;7 cases with cleft palate,2 cases wereⅠ degree,3 cases wereⅡ degree,2 cases wereⅢ degree;37 cases with cleft lip and palate,9 cases wereⅠ degree,17 cases wereⅡ degree,11 cases wereⅢ degree.Joint two-dimensional color,Doppler ultrasonic ultrasonic testing accurate diagnosis of 47 cases, including 10 cases of cleft lip and 5 cases of cleft palate, 32 cases of cleft lip and palate,accurate diagnostic rate was 78.33%,2 cases of misdiagnosis and 11 cases missed diagnosis.Joint two-dimensional ultrasound and color,Doppler ultrasound 3 d ultrasound technology TUI accurate diagnosis of 58 cases,15 cases of cleft lip and 6 cases of cleft palate,37 cases of cleft lip and palate,accurate diagnostic rate was 96.67%, 2 cases of misdiagnosis.Ultrasound images with discontinuous display lip lines or interrupt the echo of the two-dimensional ultrasound shows the nose showed “triangle”,the three dimensional ultrasound showed a cleft lip, nasal distortion, the tip of the tongue sticking out from the nasal cavity, alveolar arch radian

  9. 经腹二维与经阴道彩色多普勒超声诊断未破裂型宫外孕效果对比分析%Abdominal two-dimensional ultrasound and transvaginal color Doppler ultrasound in the diagnosis of unruptured ectopic pregnancy result contrast analysis

    Institute of Scientific and Technical Information of China (English)

    张绿林

    2012-01-01

    目的 比较经腹二维与经阴道彩色多普勒超声诊断未破裂型宫外孕的效果.方法 选取在我院确诊为未破裂型宫外孕患者98例,随机分为观察组和对照组,观察组行经阴道彩色多普勒超声检查,对照组行经腹二维超声检查,比较效果.结果 观察组准确率为95.92%,对照组准确率为61.22%,观察组假孕囊、胚芽及心管搏动、附件混合包块和盆腔积液诊断优于对照组(P<0.05).结论 经阴道彩色多普勒超声对未破裂型宫外孕的诊断优于经腹二维超声,诊断效果好.%Objective To compare the effects of the abdominal two-dimensional ultrasound and transvaginal color doppler ultrasound in the diagnosis of unruptured ectopic pregnancy results.Methods In our hospital 98 cases diagnosed as unruptured ectopic pregnancy were randomly divided into observation group and control group,the observation group was treated by transvaginal color doppler ultrasonography,the control group treated by transabdominal ultrasound,comparative effectiveness was analyzed.Results Accuracy rate of the observation group was 95.92%,the accurate rate of the control group was 61.22%,gestational sac,germ and heart throb tube,attachment mixed mass and pelvic effusion diagnosis of the observation group were better than those of control group (P<0.05).Conclusion Transvaginal color doppler ultrasound in the diagnosis for unruptured ectopic pregnancy is superior to the method of abdominal two-dimensional ultrasound,with better the diagnostic effect.

  10. Two-dimensional phase unwrapping in Doppler Fourier domain optical coherence tomography.

    Science.gov (United States)

    Wang, Yimin; Huang, David; Su, Ya; Yao, X Steve

    2016-11-14

    For phase-related imaging modalities using interferometric techniques, it is important to develop effective method to recover phase information that is mathematically wrapped. In this paper, we propose and demonstrate a two-dimensional (2D) method to achieve effective phase unwrapping in Doppler Fourier-domain (FD) optical coherence tomography (OCT), and recover the discontinuous phase distribution in retinal blood flow successfully for the first time in Doppler OCT studies. The proposed method is based on phase gradient approach in the axial dimension, with phase denoising performed through 2D window moving average in the sampled phase image using complex Doppler OCT data. The 2D unwrapping is carried out to correct phase discontinuities in the wrapped Doppler phase map, and the abrupt phase changes can be identified and corrected accurately. The proposed algorithm is computationally efficient and easy to be implemented.

  11. Diagnosis of placenta previa accreta by two dimensional ultrasonography and color doppler in patients with cesarean section%二维超声及彩色多普勒对瘢痕子宫合并前置胎盘植入的诊断及临床分析

    Institute of Scientific and Technical Information of China (English)

    施华芳; 皮丕湘; 丁依玲

    2012-01-01

    目的:探讨二维超声及彩色多普勒诊断瘢痕子宫患者合并前置胎盘植入的准确性.方法:41例曾接受剖宫产的患者本次妊娠28周后行二维超声及彩色多普勒检查,探查胎盘与子宫及膀胱之间的特征性声像图表现,确认有部分型或完全性前置胎盘,并进一步判断是否有胎盘植入,对所有病例进行追踪,以手术所见及病检结果为诊断金标准.结果:在所有41例瘢痕子宫合并前置胎盘的患者中,二维超声及彩色多普勒提示22例合并前置胎盘植入,产后经手术和病检确诊20例,19例产前二维超声及彩色多普勒未提示胎盘植入者中,产后证实有胎盘植入1例,敏感性为95.24%,特异性为94.74%.在所有确诊胎盘植入的病例中,最常见的二维超声图像为在胎盘实质和基底部可见无回声腔隙,以及彩色多普勒在子宫胎盘膀胱之间探及丰富血彩,均为95.24%.结论:应用二维超声及彩色多普勒对瘢痕子宫合并前置胎盘植入有较高的敏感性和特异性,二者联合基本可以明确诊断.%Objective: To determine the accuracy of two dismensional sonography and color doppler in diagnosing placenta previa accreta in patients with previous cesarean section.Methods: Forty-one patients with previous cesarean sections were confirmed to have partial or total placenta previa in the current pregnancy and were given ultrasound examinations after the 28th week of gestation. Specific ultrasound features of the placenta and its interphase with the uterus and the bladder for placenta accreta were checked by two-dimensional ultrasonography and color Doppler. All the patients were traced until delivery. The golden standard in diagnosis was the intraoperative finding and the pathologic exam. Results: Twenty-two patients had ultrasonographic evidence of placenta previa, 20 of which were later confirmed placenta previa accreta intraoperatively. Nineteen patients had no ultrasound evidence of

  12. Analysis on the value of two-dimensional and color Doppler ultrasound diagnosis of varicocele%二维及彩色多普勒超声检查对精索静脉曲张的临床诊断价值分析

    Institute of Scientific and Technical Information of China (English)

    汤华; 姚惠莉; 邹志强; 梁润和; 陈红方; 艾利

    2015-01-01

    目的:探讨二维及彩色多普勒超声检查对精索静脉曲张的临床诊断价值。方法选择2012年11月~2015年3月来我院就诊的128例精索静脉曲张患者并将其作为研究组,对照组为与研究组同期来我院进行健康体检的无精索静脉曲张的健康研究对象60例。所有患者均用二维及彩色多普勒超声检查。结果研究组患者中单侧精索静脉曲张90例(70.31%),双侧精索静脉曲张38例(29.69%)。研究组患侧Dm、Dv、TR、Vmax明显高于同组健侧及对照组,差异有统计学意义(P<0.05);研究组健侧Dm、Dv、TR、Vmax与对照组比较差异无统计学意义(P>0.05)。结论二维及彩色多普勒超声检查在精索静脉曲张的诊断中有安全性高、操作方便、无X线辐射、价格低廉、无创等的优点,对精索静脉曲张患者有较高的诊断正确性及较强的重复性,为精索静脉曲张患者早期、准确诊断提供依据,可作为精索静脉曲张的有效检测手段之一。%Objective To investigate the diagnostic value of two-dimensional and color Doppler ultrasound examination of varicocele. Methods The study group was consisted of 128 cases with varicocele selected from Nov 2012 to Mar 2015 , 60 cases of healthy subjects were selected in our hospital at the same period as the control group. All patients were detected with two-dimensional and color Doppler ultrasound. Results The study group had patients with unilateral varicocele 90 cases (70.31%), bilateral varicocele 38 cases (29.69%). Ipsilateral Dm, Dv, TR, Vmax of the study group were significantly higher than contralateral indexes of the same group and the control group, the difference was statistically significant (P0.05). Conclusion Color Doppler ultrasound in the diagnosis of varicocele has significant advantages, such as safety, ease of operation, no X-ray radiation, low price, non-invasive and so on. It has higher diagnostic accuracy and

  13. Measurement of two-dimensional Doppler wind fields using a field widened Michelson interferometer.

    Science.gov (United States)

    Langille, Jeffery A; Ward, William E; Scott, Alan; Arsenault, Dennis L

    2013-03-10

    An implementation of the field widened Michelson concept has been applied to obtain high resolution two-dimensional (2D) images of low velocity (<50 m/s) Doppler wind fields in the lab. Procedures and techniques have been developed that allow Doppler wind and irradiance measurements to be determined on a bin by bin basis with an accuracy of less than 2.5 m/s from CCD images over the observed field of view. The interferometer scanning mirror position is controlled to subangstrom precision with subnanometer repeatability using the multi-application low-voltage piezoelectric instrument control electronics developed by COM DEV Ltd.; it is the first implementation of this system as a phase stepping Michelson. In this paper the calibration and characterization of the Doppler imaging system is described and the planned implementation of this new technique for imaging 2D wind and irradiance fields using the earth's airglow is introduced. Observations of Doppler winds produced by a rotating wheel are reported and shown to be of sufficient precision for buoyancy wave observations in airglow in the mesopause region of the terrestrial atmosphere.

  14. Color Makes a Difference: Two-Dimensional Object Naming in Literate and Illiterate Subjects

    Science.gov (United States)

    Reis, Alexandra; Faisca, Luis; Ingvar, Martin; Petersson, Karl Magnus

    2006-01-01

    Previous work has shown that illiterate subjects are better at naming two-dimensional representations of real objects when presented as colored photos as compared to black and white drawings. This raises the question if color or textural details selectively improve object recognition and naming in illiterate compared to literate subjects. In this…

  15. Color doppler sonography in thickened gallbladder wall

    Energy Technology Data Exchange (ETDEWEB)

    Han, Sang Suk; Choi, Seok Jin; Seo, Chang Hae; Eun, Choong Ki [Inje Univ. College of Medicine, Kimhae (Korea, Republic of)

    1996-11-01

    The thickening of the gallbladder wall is a valuable finding for the diagnosis of cholecystitis, but may be seen in non-cholecystic disease as well as in acute or chronic cholecystitis. The purpose of this study is to determine the value of color Doppler sonography in differentiating the causes of thickened gallbladder wall. Ninety eight patients with thickened gallbladder wall(more than 3mm) which was not due to gallbladder cancer were prospectively evaluated with color Doppler sonography. Sixty-six cases, confirmed by pathologic reports and clinical records, were analyzed for correlation between thickened gallbladder wall and color flow signal according to the underlying causes. Of the 66 patients, 28 cases were cholecystitis and 38 cases had non-cholecystic causes such as liver cirrhosis, ascites, hepatitis, pancreatitis, renal failure, and hypoalbuminemia. Of the 28 patients with cholecystitis(12 acute, 16 chronic), 23(82%) had color Doppler flow signals in the thickened gallbladder wall. Of the 38 patients with non-cholecystic causes, eight(21%) had color Doppler flow signals. There was a statistically significant difference of color Doppler flow signals between the cholecystitis and non-cholecystic groups(p=0.0001). No significant difference of color Doppler flow signals was found between cases of acute and chronic cholecystitis. Of the 23 patients with color Doppler flow signals in 28 cases of cholecystitis, 18(78.3%) showed a linear pattern and five(21.7%) showed a spotty pattern. Of the eight patients with color Doppler flow signals in the 38 non-cholecystic cases, four(50%) showed a linear pattern and four(50%) showed a spotty pattern. In cholecystitis, a linear color Doppler flow signal pattern is a much more frequent finding than a spotty pattern. Color Doppler sonography is a useful and adequate method for determining whether a thickened gallbladder wall is the result of cholecystitis or has non-cholecystic causes.

  16. Doppler Velocimetry of Current Driven Spin Helices in a Two-Dimensional Electron Gas

    Science.gov (United States)

    Yang, Luyi

    Spins in semiconductors provide a pathway towards the development of spin-based electronics. The appeal of spin logic devices lies in the fact that the spin current is even under time reversal symmetry, yielding non-dissipative coupling to the electric field. To exploit the energy-saving potential of spin current it is essential to be able to control it. While recent demonstrations of electrical-gate control in spin-transistor configurations show great promise, operation at room temperature remains elusive. Further progress requires a deeper understanding of the propagation of spin polarization, particularly in the high mobility semiconductors used for devices. This thesis presents the demonstration and application of a powerful new optical technique, Doppler spin velocimetry, for probing the motion of spin polarization at the level of 1 nm on a picosecond time scale. We discuss experiments in which this technique is used to measure the motion of spin helices in high mobility n-GaAs quantum wells as a function of temperature, in-plane electric field, and photoinduced spin polarization amplitude. We find that the spin helix velocity changes sign as a function of wave vector and is zero at the wave vector that yields the largest spin lifetime. This observation is quite striking, but can be explained by the random walk model that we have developed. We discover that coherent spin precession within a propagating spin density wave is lost at temperatures near 150 K. This finding is critical to understanding why room temperature operation of devices based on electrical gate control of spin current has so far remained elusive. We report that, at all temperatures, electron spin polarization co-propagates with the high-mobility electron sea, even when this requires an unusual form of separation of spin density from photoinjected electron density. Furthermore, although the spin packet co-propagates with the two-dimensional electron gas, spin diffusion is strongly suppressed

  17. Staggered Multiple-PRF Ultrafast Color Doppler.

    Science.gov (United States)

    Posada, Daniel; Poree, Jonathan; Pellissier, Arnaud; Chayer, Boris; Tournoux, Francois; Cloutier, Guy; Garcia, Damien

    2016-06-01

    Color Doppler imaging is an established pulsed ultrasound technique to visualize blood flow non-invasively. High-frame-rate (ultrafast) color Doppler, by emissions of plane or circular wavefronts, allows severalfold increase in frame rates. Conventional and ultrafast color Doppler are both limited by the range-velocity dilemma, which may result in velocity folding (aliasing) for large depths and/or large velocities. We investigated multiple pulse-repetition-frequency (PRF) emissions arranged in a series of staggered intervals to remove aliasing in ultrafast color Doppler. Staggered PRF is an emission process where time delays between successive pulse transmissions change in an alternating way. We tested staggered dual- and triple-PRF ultrafast color Doppler, 1) in vitro in a spinning disc and a free jet flow, and 2) in vivo in a human left ventricle. The in vitro results showed that the Nyquist velocity could be extended to up to 6 times the conventional limit. We found coefficients of determination r(2) ≥ 0.98 between the de-aliased and ground-truth velocities. Consistent de-aliased Doppler images were also obtained in the human left heart. Our results demonstrate that staggered multiple-PRF ultrafast color Doppler is efficient for high-velocity high-frame-rate blood flow imaging. This is particularly relevant for new developments in ultrasound imaging relying on accurate velocity measurements.

  18. with Ultrasound Color Doppler Imaging

    Directory of Open Access Journals (Sweden)

    Shin Takayama

    2012-01-01

    Full Text Available Color Doppler imaging (CDI can be used to noninvasively create images of human blood vessels and quantitatively evaluate blood flow in real-time. The purpose of this study was to assess the effects of acupuncture on the blood flow of the peripheral, mesenteric, and retrobulbar arteries by CDI. Statistical significance was defined as P values less than 0.05. Blood flow in the radial and brachial arteries was significantly lower during needle stimulation on LR3 than before in healthy volunteers, but was significantly higher after needle stimulation than before. LR3 stimulation also resulted in a significant decrease in the vascular resistance of the short posterior ciliary artery and no significant change of blood flow through the superior mesenteric artery (SMA during acupuncture. In contrast, ST36 stimulation resulted in a significant increase in blood flow through the SMA and no significant change in the vascular resistance of the retrobulbar arteries. Additionally, acupuncture at previously determined acupoints in patients with open-angle glaucoma led to a significant reduction in the vascular resistance of the central retinal artery and short posterior ciliary artery. Our results suggest that acupuncture can affect blood flow of the peripheral, mesenteric, and retrobulbar arteries, and CDI can be useful to evaluate hemodynamic changes by acupuncture.

  19. Doppler Velocimetry of Current Driven Spin Helices in a Two-Dimensional Electron Gas

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Luyi [Univ. of California, Berkeley, CA (United States)

    2013-05-17

    Spins in semiconductors provide a pathway towards the development of spin-based electronics. The appeal of spin logic devices lies in the fact that the spin current is even under time reversal symmetry, yielding non-dissipative coupling to the electric field. To exploit the energy-saving potential of spin current it is essential to be able to control it. While recent demonstrations of electrical-gate control in spin-transistor configurations show great promise, operation at room temperature remains elusive. Further progress requires a deeper understanding of the propagation of spin polarization, particularly in the high mobility semiconductors used for devices. This dissertation presents the demonstration and application of a powerful new optical technique, Doppler spin velocimetry, for probing the motion of spin polarization at the level of 1 nm on a picosecond time scale. We discuss experiments in which this technique is used to measure the motion of spin helices in high mobility n-GaAs quantum wells as a function of temperature, in-plane electric field, and photoinduced spin polarization amplitude. We find that the spin helix velocity changes sign as a function of wave vector and is zero at the wave vector that yields the largest spin lifetime. This observation is quite striking, but can be explained by the random walk model that we have developed. We discover that coherent spin precession within a propagating spin density wave is lost at temperatures near 150 K. This finding is critical to understanding why room temperature operation of devices based on electrical gate control of spin current has so far remained elusive. We report that, at all temperatures, electron spin polarization co-propagates with the high-mobility electron sea, even when this requires an unusual form of separation of spin density from photoinjected electron density. Furthermore, although the spin packet co-propagates with the two-dimensional electron gas, spin diffusion is strongly

  20. Color Doppler ultrasonography evaluation of amblyopia

    Directory of Open Access Journals (Sweden)

    Ece Turan-Vural

    2013-07-01

    Full Text Available AIM: To assess the hemodynamic changes in the extraocular orbital vessels of amblyopic patients in comparison with non-amblyopic fellow eyes, using color Doppler ultrasonography(CDU. METHODS: Thirty-six eyes of 18 pediatric patients were included in the study(20 amblyopic, 16 normal. All eyes underwent color Doppler ultrasonography examination of ophthalmic artery, central retinal artery, and posterior ciliary artery. RESULTS: The only differences between the two groups with regard to color Doppler ultrasonography parameters was the significantly lower peak systolic velocity(32.70±11.60 vs 55.01±11.68, P=0.001and end-diastolic velocity(6.83±1.91 vs 13.99±4.15, P=0.001for ophthalmic artery in amblyopic eyes.CONCLUSION: Our study showed amblyopic eyes may present a decrease in retrobulbar blood flow velocity.

  1. Double Doppler effect in two-dimensional photonic crystal with negative effective index

    Science.gov (United States)

    Jiang, Qiang; Chen, Jiabi; Liang, Binming; Zhuang, Songlin

    2016-11-01

    The inverse Doppler effect in photonic crystal with negative refractive index had been proofed experimentally in our previous research. In this paper, we studied the spatial harmonics of Bloch wave propagating in such PhCs by FFT method. The lagging and front phase evolutions reveal that both backward wave and forward wave exist in these harmonics. Subsequently, we studied the double Doppler effect phenomenon that both the normal and inverse Doppler exist in one photonic crystal simultaneously by using the improved dynamic FDTD method which we made it suitable for dealing with moving objects. The simulative Doppler frequency shifts were consistent with the theoretical values. Our study provides a potential technology in measurement area.

  2. Two-dimensional and three-dimensional Doppler assessment of fetal growth restriction with different severity and onset.

    Science.gov (United States)

    Luria, Oded; Barnea, Ofer; Shalev, Josef; Barkat, Jonathan; Kovo, Michal; Golan, Abraham; Bar, Jacob

    2012-12-01

    To investigate the role of three-dimensional (3D) power Doppler ultrasonography in the assessment of fetal growth-restriction (FGR) with various degrees of severity and onset, and compare the results with the analysis of two-dimensional (2D) Doppler. Vascular indices extracted from 3D Doppler measurements of the placenta were compared with indices of flow-velocity waveforms extracted from 2D Doppler measurements of the major sites of the fetal circulation between FGR (study group) and uncomplicated pregnancies (control group) from 25 to 38 weeks' gestation. Three-dimensional indices were significantly lower in pregnancies complicated by FGR compared with uncomplicated pregnancies. When measured in placental periphery, vascularization index was 9.4 ± 9.6 in FGR pregnancies compared with 16 ± 14.7, P = 0.04. Flow index was 33.9 ± 6.9 compared with 38.7 ± 4.9, P = 0.03 and the vascularization-flow index was 3.8 ± 4.3 compared with 6.5 ± 6, respectively, P = 0.03. Among the conventional 2D indices, umbilical artery and middle cerebral artery pulsatility indices were not significantly different between the FGR and control groups. Higher rate of maternal or fetal compartment vascular lesions were detected in the FGR group. Three-dimensional Doppler was found to be more strongly associated with placental vascular compromise than conventional 2D Doppler, regardless of severity and onset of fetal growth restriction. © 2012 John Wiley & Sons, Ltd.

  3. Effects of Colored Noise on Self-Propelled Particles in a Two-Dimensional Potential

    Science.gov (United States)

    Wang, Bing; Li, Xuechao; Chen, Changzhao; Ma, Jianli

    2016-10-01

    The effects of colored noise on self-propelled particles in a two-dimensional potential are investigated. The resonance phenomenon was found as the the average velocity has a maximum value with increasing x direction noise intensity. The average velocity takes its maximal value as the parameters (the y direction noise intensity, the self-propelled angle noise intensity, and so on) take suitable values. The y direction noise and the self-propelled angle noise have great effects on the x direction particles transport. The y direction noise and the self-propelled angle noise cannot induce x direction particles transport in the absence of x direction noise. The ratchet effect should disappear when there is no coupling between the x direction potential and the y direction potential.

  4. Color Doppler US of the penis

    Energy Technology Data Exchange (ETDEWEB)

    Bertolotto, Michele (ed.) [Trieste Univ. Ospedale di Cattinara (Italy). Dept. Radiology

    2008-07-01

    This book provides a comprehensive reference and practical guide on the application of US to penile diseases and conditions. After introductory chapters on technical requirements and penile anatomy, subsequent chapters offer a systematic overview of the diverse applications of color Doppler US. The topics covered include erectile dysfunction, Peyronie's disease, priapism, trauma, tumors, the postoperative penis, inflammation, and fibrosis. Each topic is introduced by a clinical overview with the purpose of clarifying the problems and elucidating what the urologist may expect from color Doppler US. Thereafter, performance of the US study is explained and the pathological anatomy reviewed. High-quality images obtained with high-end US equipment are included. Each chapter also contains a section on the diagnostic information provided by other imaging modalities, and in particular MRI. (orig.)

  5. [Color Doppler sonography of focal abdominal lesions].

    Science.gov (United States)

    Licanin, Zoran; Lincender, Lidija; Djurović, V; Salihefendić, Nizama; Smajlović, Fahrudin

    2004-01-01

    Color Doppler sonography (CDS--spectral, color and power), harmonic imaging techniques (THI, PHI), possibility of 3D analysis of picture, usage of contrast agents, have raised the values of ultrasound as a diagnostic method to a very high level. THI--non-linear gray scale modality, is based on the processing of higher reflected frequencies, that has improved a picture resolution, which is presented with less artifacts and limiting effects of obesity and gases. Ultrasound contrast agents improve analysis of micro and macro circulation of the examined area, and with the assessment of velocity of supply in ROI (wash in), distribution and time of signal weakening (wash out), are significantly increasing diagnostic value of ultrasound. Besides the anatomical and topographic presentation of examined region (color, power), Color Doppler sonography gives us haemodynamic-functional information on vascularisation of that region, as well as on pathologic vascularisation if present. Avascular aspect of a focal pathologic lesion corresponds to a cyst or haematoma, while coloration and positive spectral curve discover that anechogenic lesions actually represents aneurysms, pseudoaneurysms or AVF. In local inflammatory lesion, abscess in an acute phase, CDS shows first increased, and then decreased central perfusion, while in a chronic phase, a pericapsular vascularisation is present. Contribution of CDS in differentiation of hepatic tumors (hemangioma, HCC and metastasis) is very significant. Central color dots along the peripheral blood vessels and the blush phenomenon are characteristics of capillary hemangioma, peritumoral vascular ring "basket" of HCC, and "detour" sign of metastasis. The central artery, RI from 0.45 to 0.60 and radial spreading characterize FNH. Hepatic adenoma is characterized by an intratumoral vein, and rarely by a vascular hallo. Further on, blood velocity in tumor defined by Color Doppler, distinguishes malignant from benign lesion, where 40 cm/s is a

  6. Defects in Al-3wt%Cu after High-pressure Torsion Studied by Two-dimensional Doppler Broadening Spectroscopy

    Science.gov (United States)

    Parz, P.; Faller, M. J.; Pippan, R.; Puff, W.; Würschum, R.

    High-pressure torsion (HPT) was applied to the structural refinement of an age-hardenable Al-Cu alloy. HPT deformation gives rise to a grain refinement down to sizes of 100 nm and introduces various types of open volume defects. Positron annihilation spectroscopy (PAS), especially the chemical sensitive method of two-dimensional Doppler-broadening spectroscopy (2d-DB), was used for a detailed analysis of the deformation-induced vacancy-type defects and the vacancy-solute interaction. The correlation between microstructure and thermal annealing is discussed. HPT-deformed Al-3wt%Cu shows predominantly deformation-induced positron traps with a strongly reduced copper environment in comparison with the undeformed sample.

  7. [Color-Doppler semiology in transplanted kidney].

    Science.gov (United States)

    Rivolta, R; Castagnone, D; Burdick, L; Mandelli, C; Mangiarotti, R

    1993-05-01

    Color-encoded duplex ultrasonography (CEDU) makes a more accurate technique in kidney graft monitoring by combining real-time US with pulsed Doppler studies of renal vasculature. It is a non-invasive and easy technique. Suitable to study the whole renal artery and vein, CEDU also allows the qualitative and quantitative assessment of the intrarenal vasculature and therefore the easy diagnosis of such vessel dysfunctions as arteriovenous fistulas following biopsy. Moreover, Doppler spectral analysis can be used to distinguish among different causes of renal allograft dysfunction--i.e. rejection, cyclosporine nephrotoxicity or acute tubular necrosis. The value of the resistive index for the differential diagnosis is discussed. CEDU allows a more reliable measurement of renal blood flow thanks to the more precise evaluation of renal artery diameter and mean flow velocity.

  8. Power and color Doppler ultrasound settings for inflammatory flow

    DEFF Research Database (Denmark)

    Torp-Pedersen, Søren; Christensen, Robin; Szkudlarek, Marcin

    2015-01-01

    OBJECTIVE: To determine how settings for power and color Doppler ultrasound sensitivity vary on different high- and intermediate-range ultrasound machines and to evaluate the impact of these changes on Doppler scoring of inflamed joints. METHODS: Six different types of ultrasound machines were used....... On each machine, the factory setting for superficial musculoskeletal scanning was used unchanged for both color and power Doppler modalities. The settings were then adjusted for increased Doppler sensitivity, and these settings were designated study settings. Eleven patients with rheumatoid arthritis (RA......) with wrist involvement were scanned on the 6 machines, each with 4 settings, generating 264 Doppler images for scoring and color quantification. Doppler sensitivity was measured with a quantitative assessment of Doppler activity: color fraction. Higher color fraction indicated higher sensitivity. RESULTS...

  9. Multi-channel laser Doppler velocimetry using a two-dimensional optical fiber array for obtaining instantaneous velocity distribution characteristics

    Science.gov (United States)

    Kyoden, Tomoaki; Yasue, Youichi; Ishida, Hiroki; Akiguchi, Shunsuke; Andoh, Tsugunobu; Takada, Yogo; Teranishi, Tsunenobu; Hachiga, Tadashi

    2015-01-01

    A laser Doppler velocimeter (LDV) has been developed that is capable of performing two-dimensional (2D) cross-sectional measurements. It employs two horizontal laser light sheets that intersect at an angle of 13.3°. Since the intersection region is thin, it can be used to approximately determine the 2D flow field. An 8 × 8 array of optical fibers is used to simultaneously measure Doppler frequencies at 64 points. Experiments were conducted to assess the performance of the LDV, and it was found to be capable of obtaining spatial and temporal velocity information at multiple points in a flow field. The technique is fast, noninvasive, and accurate over long sampling periods. Furthermore, its applicability to an actual flow field was confirmed by measuring the temporal velocity distribution of a pulsatile flow in a rectangular flow channel with an obstruction. The proposed device is thus a useful, compact optical instrument for conducting simultaneous 2D cross-sectional multipoint measurements.

  10. Color Doppler US of superficial adenopathies; Il color Doppler nelle adenopatie superficiali

    Energy Technology Data Exchange (ETDEWEB)

    Giovagnorio, F. [Rome Univ. (Italy). 1. Cattedra di Radiologia

    1999-03-01

    Superficial lymph node are frequently involved in different diseases. Their location makes them suitable for effective assessment with high-resolution US and color Doppler has been recently suggested as a tool for increasing sensitivity in lymph node studies. Thus the author investigated the main vascular patterns detectable in abnormal superficial lymph nodes. [Italian] Numerosa malattie con natura differente coinvolgono i linfonodi superficiali: la localizzazione ne consente l'esplorazione con ecografia con alta risoluzione e lo studio mediante eco color Doppler e' stato proposto negli ultimi anni incontrando notevole sviluppo in tempi recenti. Scopo del lavoro e' illustrare il contributo personale nella definizione dei principali quadri riscontrabili nelle diverse adenopatie superficiali.

  11. Pixel-based analysis of comprehensive two-dimensional gas chromatograms (color plots) of petroleum

    DEFF Research Database (Denmark)

    Furbo, Søren; Hansen, Asger B.; Skov, Thomas;

    2014-01-01

    We demonstrate how to process comprehensive two-dimensional gas chromatograms (GC × GC chromatograms) to remove nonsample information (artifacts), including background and retention time shifts. We also demonstrate how this, combined with further reduction of the influence of irrelevant informati...

  12. Evaluating Peripheral Vascular Injuries: Is Color Doppler Enough for Diagnosis?

    Directory of Open Access Journals (Sweden)

    Mohd Lateef Wani

    2014-03-01

    Full Text Available Background:: Vascular injury poses a serious threat to limb and life. Thus, diagnosis should be made immediately with minimally invasive methods. Doppler is a good aid in diagnosis of vascular injury. Methods:: The present prospective study was conducted on 150 patients who presented with soft signs (the signs which are suggestive but not confirmatory of vascular injury. They were subjected to color Doppler examination before exploration. The patients with the features of vascular injury on color Doppler were subjected to exploration. On the other hand, those who had normal Doppler were subjected to CT- angiography. Then, the findings of the exploration were matched with those of color Doppler. The data were analyzed using the SPSS statistical software. Results:: Out of the 150 Doppler examinations, 110 (73.33% were reported as positive, while 40 were reported as negative for vascular injury. These were subjected to CT-angiography and seven of them had the features of vascular injury on CT-angiography. All the patients with positive Doppler or CT angiography findings were subjected to exploration. Doppler had a sensitivity of 94% and specificity of 82.5% in diagnosis of vascular injury using Binary classification test. Conclusions:: Color Doppler is an easily available, reliable, and handy method of diagnosing a vascular injury. It has a very high sensitivity and specificity in diagnosis of vascular injuries.

  13. COLOR DOPPLER ULTRASOUND IN EVALUATION OF SCROTAL LESIONS

    Directory of Open Access Journals (Sweden)

    Desai Sanjay

    2015-11-01

    Full Text Available : Color Doppler ultrasound is a non-invasive, non-ionising and rapid method for scrotal examination. The present study is carried out to evaluate clinically suspected cases of scrotal lesions, the sensitivity, specificity of color doppler. MATERIAL AND METHODS: This prospective study comprises 120 patients of different age groups with clinical suspicion of scrotal lesions. Color doppler ultrasound was done with 7.5MHz transducer. RESULTS: Of the total 120 cases, benign conditions 111 (92.5% is more common than malignant 9 (7.5%. In benign group commonest diagnoses were hydrocele, epididymo-orchitis, varicocele and epididymal cyst. In malignant group teratocarcinoma, choriocarcinoma, seminoma, lymphoma, embryonal cell carcinoma, yolk sac tumor with teratocarcinoma. The sensitivity for diagnosing extratesticular lesions was 83.14% and for testicular lesions 88.57%. CONCLUSION: Color doppler ultrasound is helpful in differentiating extratesticular and intratesticular lesions. It should be performed in all patients with suspected scrotal lesions

  14. Ultrasonography with color Doppler and power Doppler in the diagnosis of periapical lesions

    Directory of Open Access Journals (Sweden)

    Sumit Goel

    2011-01-01

    Full Text Available Aim: To evaluate the efficacy of ultrasonography (USG with color Doppler and power Doppler applications over conventional radiography in the diagnosis of periapical lesions. Materials and Methods: Thirty patients having inflammatory periapical lesions of the maxillary or mandibular anterior teeth and requiring endodontic surgery were selected for inclusion in this study. All patients consented to participate in the study. We used conventional periapical radiographs as well as USG with color Doppler and power Doppler for the diagnosis of these lesions. Their diagnostic performances were compared against histopathologic examination. All data were compared and statistically analyzed. Results: USG examination with color Doppler and power Doppler identified 29 (19 cysts and 10 granulomas of 30 periapical lesions accurately, with a sensitivity of 100% for cysts and 90.91% for granulomas and a specificity of 90.91% for cysts and 100% for granulomas. In comparison, conventional intraoral radiography identified only 21 lesions (sensitivity of 78.9% for cysts and 45.4% for granulomas and specificity of 45.4% for cysts and 78.9% for granulomas. There was definite correlation between the echotexture of the lesions and the histopathological features except in one case. Conclusions: USG imaging with color Doppler and power Doppler is superior to conventional intraoral radiographic methods for diagnosing the nature of periapical lesions in the anterior jaws. This study reveals the potential of USG examination in the study of other jaw lesions.

  15. A Two-dimensional Map of Color Excess in NGC 3603

    CERN Document Server

    Pang, Xiaoying; Grebel, Eva K

    2011-01-01

    Using archival HST/WFC3 images centered on the young HD 97950 star cluster in the giant HII region NGC 3603, we computed the pixel-to-pixel distribution of the color excess, E(B-V)g, of the gas associated with this cluster from its H_alpha/Pa_beta flux ratio. At the assumed distance of 6.9 kpc, the resulting median color excess within 1 pc from the cluster center is E(B-V)g =1.51 \\pm 0.04 mag. Outside the cluster (at r > 1 pc), the color excess is seen to increase with cluster-centric distance towards both North and South, reaching a value of about 2.2 mag at r = 2 pc from the cluster center. The radial dependence of E(B-V)g westward of the cluster appears rather flat at about 1.55 mag over the distance range 1.2 pc < r < 3 pc. In the eastern direction, E(B-V)g steadily increases from 1.5 mag at r = 1 pc to 1.7 mag at r = 2 pc, and stays nearly constant at 1.7 mag for 2 pc < r < 3 pc. The different radial profiles and the pixel-to-pixel variations of E(B-V)g clearly indicate the presence of signif...

  16. Color Doppler US in the acute scrotal disease

    Energy Technology Data Exchange (ETDEWEB)

    Cha, Yoo Mi; Yang, Dal Mo; Kang, Sook Wook; Kim, Hyung Sik; Lee, Young Seok; Kim, Hyeon Hoe [Chung Ang Gil Hospital, Incheon (Korea, Republic of)

    1993-12-15

    To evaluate the utility of Color doppler US in the patients with acute scrotal pain, we retrospectively analyzed 37 patients referred for Color Doppler US of the scrotum. The diagnosis was confirmed by means of appropriate response to antibiotic treatment (31 cases) or surgery (6 cases). Thirty one of 37 patients were diagnosed as inflammatory disease (24 cases of epididymitis, 7 cases of epididymo-orchitis). Twenty three of 24cases of epididymitis had increased epididymal flow, while 6 of 7 cases of epididymo-orchitis had increased epididymal and testicular flow. Five patients were confirmed as testicular torsion, and in all cases nointratesticular blood flow was identified on the symptomatic side. In one case of torsion of appendix testis, epididymis was enlarged and there were increased signals suggesting epididymitis on Color Doppler US, but was confirmed by surgery as torsion of appendix testis. Therefore, the differentiation between torsion and inflammatory disease was possible by using Color Doppler US of the scrotum in 34 of 37 cases in our study. On the basis of our results, we may conclude that Color Doppler US can simultaneously display blood flow and detailed anatomic images, and function as an effective means of evaluating patients with acute scrotal disease

  17. Aliasing-tolerant color Doppler quantification of regurgitant jets.

    Science.gov (United States)

    Stewart, S F

    1998-07-01

    Conservation of momentum transfer in regurgitant cardiac jets can be used to calculate the flow rate from color Doppler velocities. In this study, turbulent jets were simulated by finite elements; pseudocolor Doppler images were interpolated from the computations, with aliasing introduced artificially. Jets were also imaged by color Doppler in an in vitro flow system. To suppress aliasing errors, jet velocities were fitted iteratively to a fluid mechanical model constrained to match the orifice velocity (measured without aliasing by continuous-wave Doppler). At each iteration, the model was used to detect aliased velocities, which were excluded during the next iteration. Iteration continued until the flow rate calculated by the model and number of calculated nonaliased pixels were unchanged. The good correlations between measured and calculated flow rates in the experimental (R2 = 0.933) and computational studies (R2 = 0.990) suggest that this may be a clinically useful approach even in aliased images. Published by Elsevier Science Inc.

  18. Two-dimensional power Doppler-three-dimensional ultrasound imaging of a cesarean section dehiscence with utero-peritoneal fistula: a case report

    Directory of Open Access Journals (Sweden)

    Royo Pedro

    2009-01-01

    Full Text Available Abstract Introduction An imaging diagnosis after an iterative cesarean delivery is reviewed demonstrating a fine ultrasound-pathologic correlation. Case presentation A 33-year-old woman (G3, P3 presented referring intense dysmenorrhea and intermenstrual spotting since her third cesarean delivery, 1 year before. A cesarean section dehiscence with utero-peritoneal fistula was diagnosed by transvaginal ultrasound. Conclusion We can conclude that transvaginal two-dimensional power Doppler and three-dimensional ultrasound are highly accurate in detecting cesarean section dehiscence and uterine fistula.

  19. Mechanism Analysis of the Inverse Doppler Effect in Two-Dimensional Photonic Crystal based on Phase Evolution

    Science.gov (United States)

    Jiang, Qiang; Chen, Jiabi; Wang, Yan; Liang, Binming; Hu, Jinbing; Zhuang, Songlin

    2016-04-01

    Although the inverse Doppler effect has been observed experimentally at optical frequencies in photonic crystal with negative effective refractive index, its explanation is based on phenomenological theory rather than a strict theory. Elucidating the physical mechanism underlying the inverse Doppler shift is necessary. In this article, the primary electrical field component in the photonic crystal that leads to negative refraction was extracted, and the phase evolution of the entire process when light travels through a moving photonic crystal was investigated using static and dynamic finite different time domain methods. The analysis demonstrates the validity of the use of np (the effective refractive index of the photonic crystal in the light path) in these calculations, and reveals the origin of the inverse Doppler effect in photonic crystals.

  20. Color Doppler Ultrasound Velocimetry Flow Reconstruction using Vorticity-Streamfunction Formulation

    Science.gov (United States)

    Meyers, Brett; Vlachos, Pavlos; Goergen, Craig; Scalo, Carlo

    2016-11-01

    Clinicians commonly utilize Color Doppler imaging to qualitatively assess the velocity in patient cardiac or arterial flows. However Color Doppler velocity are restricted to two-dimensional one-component measurements. Recently new methods have been proposed to reconstruct a two-component velocity field from such data. Vector Flow Mapping (VFM), in particular, utilizes the conservation of mass to reconstruct the flow. However, this method over-simplifies the influence of wall and surrounding blood motion on local measurements, which produce large, non-physical velocity gradients, requiring excessive smoothing operations to remove. We propose a new approach based on the Vorticity-Stream Function (Ψ- ω) formulation that yields more physiologically accurate velocity gradients and avoids any added smoothing operations. Zero-penetration conditions are specified at the walls, removing the need for measurement of wall velocity from additional scans, which introduce further uncertainties in the reconstruction. Inflow and outflow boundary conditions are incorporated by prescribing Dirichlet boundary conditions. The proposed solver is compared against the VFM using computational data to evaluate measurement improvement. Finally we demonstrate the method by evaluating murine left ventricle Color Doppler scans.

  1. Two dimensional and Doppler echocardiographic evaluation of patients presenting at Obafemi Awolowo University Teaching Hospitals Complex Ile Ife Nigeria a prospective study of 2501 subjects

    Directory of Open Access Journals (Sweden)

    Adebayo RA

    2013-07-01

    Full Text Available Rasaaq Ayodele Adebayo,1 Patience Olayinka Akinwusi,2 Michael Olabode Balogun,1 Anthony Olubunmi Akintomide,1 Victor Oladeji Adeyeye,1 Olugbenga Olusola Abiodun,1 Luqman Adeleke Bisiriyu,3 Suraj Adefabi Ogunyemi,1 Ebenezer Adekunle Ajayi,4 Olufemi Eyitayo Ajayi,1 Adebayo Tolulope Oyedeji5 1Cardiology Unit, Department of Medicine, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, 2Cardiology Unit, Department of Medicine, Osun State University, Osogbo, Osun State, 3Department of Demography and Social Statistics, Obafemi Awolowo University, Ile-Ife, Osun State, 4Cardiology Unit, Department of Medicine, Ekiti State University Teaching Hospital, Ado-Ekiti, Ekiti State, 5Cardiology Unit, Department of Medicine, LAUTECH Teaching Hospital, Osogbo, Osun State, Nigeria Background: Echocardiography remains a key noninvasive cardiac investigative tool in the management of patients, especially in a developing economy like Nigeria. In this study, we investigated the indications for transthoracic echocardiography and spectrum of cardiac disease found in patients referred to our cardiac unit for echocardiography. Methods: A prospective two-dimensional, pulsed, continuous, and color-flow Doppler echocardiographic evaluation was done using the transthoracic approach in 2501 patients over an eight-year period. Univariate data analysis was performed for mean age, gender, clinical indications, and diagnoses. Results: The subject age range was less than 12 months to 97 years (mean 52.39 years. There were 1352 (54.06% males and 1149 (45.94% females. The most common indication for echocardiography was hypertension (52.1% followed by congestive cardiac failure (13.9%. Others were for screening (6.1%, arrhythmias (5%, cerebrovascular disease (5%, chest pain (3.3%, chronic kidney disease (3.2%, congenital heart disease (2.6%, cardiomyopathy (1.8%, rheumatic heart disease (1.7%, diabetes mellitus (1.3%, thyrocardiac disease (1.2%, ischemic heart

  2. Gestational trophoblastic neoplasia: efficacy of color doppler ultrasound

    Energy Technology Data Exchange (ETDEWEB)

    Song, Sun Wha; Jee, Won Hee; Choe, Bo Young; Byun, Jae Young; Choi, Byung Gil; Shinn, Kyung Sub [Catholic Univ. College of Medicine, Seoul (Korea, Republic of)

    1997-04-01

    To evaluate the efficacy of color Doppler ultrasound (US) in the diagnosis of gestational trophoblastic neoplasia (GTN). Intralesional color flows and resistive index (RI) on color Doppler US were prospectively analyzed in 21 consecutive suspected GTN cases. RI of the intralesional artery was investigated on the basis of the presence or absence of mass and metastasis. Correlation between RI of intralesional artery and urinary {beta}-hCG was also investigated. Intralesional color flows were identified in 15 patients with GTN. On operation, intralesional color flows were observed in one of two patients in whom the presence of completely necrotic tissue was confirmed. Intralesional color flows, however, were not detected in four patients who were proved not to be GTN sufferers. Sensitivity, specificity, accuracy, positive and negative predictive values, and accuracy were 100%, 83%, 95%, 94% and 100%, respectively. Significant correlation between RI of the intralesional artery and urinary {beta}-hCG was not established (p=0.49, r=0.19). RI of this artery was not substantially different between groups with and without mass, and between groups with and without metastasis (p=0.32, p=0.82). The current study demonstrates that color Doppler US is a sensitive and useful method for the diagnosis of GTN.

  3. Two-dimensional Oxygen Distribution in a Surface Sediment Layer Measured Using an RGB Color Ratiometric Oxygen Planar Optode

    Directory of Open Access Journals (Sweden)

    Jae Seong Lee

    2013-09-01

    Full Text Available We measured two-dimensional (2-D oxygen distribution in the surface sediment layer of intertidal sediment using a simple and inexpensive planar oxygen optode, which is based on a color ratiometric image approach. The recorded emission intensity of red color luminophore light significantly changed with oxygen concentration by O2 quenching of platinum(IIoctaethylporphyrin (PtOEP. The ratios between the intensity of red and green emissions with oxygen concentration variation demonstrated the Stern-Volmer relationship. The 2-D oxygen distribution image showed microtopographic structure, diffusivity boundary layer and burrow in surface sediment layer. The oxygen penetration depth (OPD was about 2 mm and the one-dimensional vertical diffusive oxygen uptake (DOU was 12.6 mmol m−2 d−1 in the undisturbed surface sediment layer. However, those were enhanced near burrow by benthic fauna, and the OPD was two times deeper and DOU was increased by 34%. The simple and inexpensive oxygen planar optode has great application potential in the study of oxygen dynamics with high spatiotemporal resolution, in benthic boundary layers.

  4. Color M-mode and pulsed wave tissue Doppler echocardiography

    DEFF Research Database (Denmark)

    Møller, J E; Søndergaard, E; Poulsen, S H;

    2001-01-01

    To assess the association between color M-mode flow propagation velocity and the early diastolic mitral annular velocity (E(m)) obtained with tissue Doppler echocardiography and to assess the prognostic implications of the indexes, echocardiography was performed on days 1 and 5, and 1 and 3 months...

  5. Color doppler in diagnosis of pathological changes in blood vessels

    Directory of Open Access Journals (Sweden)

    Mladenović Saša

    2014-01-01

    Full Text Available Color Doppler ultrasound is a method that allows noninvasive imaging of blood flow through a blood vessel and analysis of blood vessels, which can be made to flow disturbance and the presence of plaque and narrowing of the blood vessel. Color Doppler ultrasonography allows early detection of pathological changes in blood vessels, which contributes to adequate preventive and therapeutic procedures in the prevention of cerebrovascular disorders. The aim of this paper is to demonstrate the importance of color Doppler ultrasound blood vessels in the diagnosis of pathological changes in the blood vessels of the neck. To create a work used the material of the Cabinet of color Doppler ultrasonography of the Health Center in Donja Gusterica in a prospective study of a random sample of 60 patients were reviewed in January 2014. Gender analysis examined patients, women were 32 (53.33% and 28 men (46.67%. Looking at the age of examined patients, we have found that most of them 43 (71.67% over the age of 50 years, while we found 17 (28.33% patients under 50 years. Atherosclerotic plaques were diagnosed in 36, a change in the shape of the carotid arteries in 29 patients. Atherosclerotic plaque, we usually find the bifurcation ACC and the Origin ACI in 23 (63.89%. Duplex sonography shows what angioneurologists and vascular surgeons are most interested in: the morphology of arterial lesions and hemodynamic effects.

  6. Color Doppler Ultrasonographic Features of Hashimoto's Thyroiditis

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joo Hyuk; Kim, Mie Young; Rho, Eun Jin; Yi, Jeong Geun; Han, Chun Hwan [Kangnam General Hospital Public Corporation, Seoul (Korea, Republic of); Hwang, Hee Yong [Choong Ang Gil Hospital, Incheon (Korea, Republic of)

    1995-06-15

    Color Doppler ultrasonographic(US) features of 28 patients with Hashimato's thyroiditis were evaluated with regard to echo and color-flow patterns. Correlation of color-flow pattern with thyroid function was performed. All 28 patients showed varying degrees of diffuse enlargement of the thyroid gland and a heterogeneous echo pattern.Color-flow pattern of increased blood flow. Low to moderate, focally increased blood flow was seen in 26 patients(92.8%). Of these 26 patients, 24 patients showed subclinical hypothyroidism or euthyroidism. Two patients who showed hyperthyroidism showed several pieces of focally increased color flow, Which was noted during both systole and diastole. Diffuse, multifocal color-flow throughout thyroid gland was seen in two patients with Hashimato's thyroiditis: one with clinical hypothyroidism and the other with subclinical hypothyroidism. Even though Hashimoto's thyroiditis showed variable color-flow patterns, we believe that heterogenous parenchymal echopattern with low or moderately increased flow is a rather characteristic feature of Hashimoto's thyroiditis, and we suggest that color Doppler US provides additional information for evaluation of Hashimoto's thyroiditis

  7. Color Doppler Ultrasonography in Evaluation of the Postoperative Penis

    Directory of Open Access Journals (Sweden)

    M. Ghafouri

    2005-08-01

    Full Text Available Introduction & Background: Color Doppler ultrasonography (US is the imaging modality of choice in patients with penile diseases. Ultrasonography has a well-established role in evaluating erectile dysfunction as well as penile trauma, scarring, deformity, and tumors. The normal postoperative anatomy and the pathologic changes that can occur in cases of surgical complications can be successfully investigated with US. Gray Scale (B Mode and Color Doppler US clearly depicts the normal penile anatomy and postoperative changes. It is also effective in evaluating surgery-related complications and determining the causes of erectile dysfunction and other un-satisfactory long¬term results. Color Doppler US is the imaging modality of choice in evaluating patients who have undergone penile surgery. Here we aim to illustrate the gray-scale and color Doppler US appearance of normal penis, discuss the main penile surgical procedures, recognize the typical US features of the postopera-tive penis, and describe the US appearance of various postoperative complications. Patients & Methods: This article is the result of evaluating 42 patients referred to the radiology ward of Hashemi-Nejad Hospital, Iran University of Medical Sciences in the years 2002 to 2005 for ultrasonography of penis to assess the penis after different penile surgical procedures (urethral surgery, correction of penile mal-formations, prosthesis implantation, vascular surgery for impotence, surgical management of priapism, phallic reconstruction. The US apparatus was Esaote Technos MP, with linear multifrequency 5-8.5MHz. transducer. Results: A variety of early and late surgical complications could be identified, such as extraalbugineal patho-logic fluid collections and fibrosis. Moreover, Doppler US of the penile vessels and vascular anastomoses fol-lowing revascularization allowed direct evaluation of flow characteristics, shunt patency, and venous en-gorgement. Color Doppler US was also

  8. The US color Doppler in acute renal failure.

    Science.gov (United States)

    Nori, G; Granata, A; Leonardi, G; Sicurezza, E; Spata, C

    2004-12-01

    Imaging techniques, especially ultrasonography and Doppler, can give an effective assistance in the differential diagnosis of acute renal failure (ARF). An resistance Index (RI) value >0.75 is reported as optimal in attempting differential diagnosis between acute tubular necrosis (ANT) and prerenal ARF. In hepatorenal syndrome (HRS) RIs is very increased. In some renal vasculitis, as nodose panarteritis (PN), hemolytic-uremic syndrome (HUS), thrombotic thrombocytopenic purpura (TTP), parenchymal perfusion is reduced and RI increased. In lupus nephritis the RI values are correlated with creatinine level and normal RI are considered as a good prognostic tool. In acute primitive or secondary glomerulonephritis (GN), RI value is normal, with diffuse parenchymal hypervascularization. In acute crescentic and proliferative GN and tubulo-interstitial disease, color Doppler (CD) and power Doppler (PD) reveal a decreased renal parenchymal perfusion, which correlates with increased RI values. In acute thrombosis of renal artery, US color Doppler (DUS) reveals either an absence of Doppler signal or a tardus-parvus pulse distal to the vascular obstruction. In this situation it is possible to visualize hyperthropic perforating vessels that redirect their flow from the capsular plexus to the renal parenchyma. In acute thrombosis of the renal vein Doppler analysis of parenchymal vessels reveals remarkable RI values, sometimes with reversed diastolic flow. In postrenal ARF an adjunct to the differentiation between obstruction and non obstructive dilatation can be found through RIs. Diagnostic criteria of obstruction as reported by literature are: RI>0.70 in the obstructed kidney and, mostly, a difference in RI between the 2 kidneys >0.06-0.1.

  9. Color Doppler in the Assessment of Uteroplacental Circulation Insufficiency

    Directory of Open Access Journals (Sweden)

    Ahmad Soltani Shirazi

    2010-05-01

    Full Text Available Usage of color Doppler ultrasound in the diagnosis of uteroplacental or fetal-placental vascular insufficiency is based on the theory that many of these insufficiencies are due to small vessel disease in the uteroplacental or fetal-placental vasculature which ultimately results in fetal intrauterine growth retardation, increase in prenatal mortality and morbidity and fetal neurological development. "nIn a prospective study on patients who were sus-pected for developing uteroplacental insufficiency, color Doppler ultrasound was done and the results were compared with neonatal weight (one of the most important criteria for IUGR determination which was measured just after delivery."nDirect significant relation was showed to be present between prepartum vascular changes detected in Doppler ultrasound and prognosis of IUGR. "nThree vessel types were assessed in this study:"n1. Umbilical-middle cerebral arteries"n2. Uterine arteries"n3.Venous system (umbilical, ductus venosus, IVC, which is used to assess the compensation process in fetal circulation."nThree Doppler indices of vascular resistance were studied and their abnormalities according to the age of pregnancy were assessed.

  10. Two-dimensional multi-frequency imaging of a tumor inclusion in a homogeneous breast phantom using the harmonic motion Doppler imaging method

    Science.gov (United States)

    Kamali Tafreshi, Azadeh; Barış Top, Can; Güneri Gençer, Nevzat

    2017-06-01

    Harmonic motion microwave Doppler imaging (HMMDI) is a novel imaging modality for imaging the coupled electrical and mechanical properties of body tissues. In this paper, we used two experimental systems with different receiver configurations to obtain HMMDI images from tissue-mimicking phantoms at multiple vibration frequencies between 15 Hz and 35 Hz. In the first system, we used a spectrum analyzer to obtain the Doppler data in the frequency domain, while in the second one, we used a homodyne receiver that was designed to acquire time-domain data. The developed phantoms mimicked the elastic and dielectric properties of breast fat tissue, and included a 14~\\text{mm}× 9 mm cylindrical inclusion representing the tumor. A focused ultrasound probe was mechanically scanned in two lateral dimensions to obtain two-dimensional HMMDI images of the phantoms. The inclusions were resolved inside the fat phantom using both experimental setups. The image resolution increased with increasing vibration frequency. The designed receiver showed higher sensitivity than the spectrum analyzer measurements. The results also showed that time-domain data acquisition should be used to fully exploit the potential of the HMMDI method.

  11. Color-flow Doppler sonography in Graves disease: "thyroid inferno".

    Science.gov (United States)

    Ralls, P W; Mayekawa, D S; Lee, K P; Colletti, P M; Radin, D R; Boswell, W D; Halls, J M

    1988-04-01

    Graves disease is a common diffuse abnormality of the thyroid gland usually characterized by thyrotoxicosis. We performed color-flow Doppler sonography in 16 patients with Graves disease and compared the results with those in 15 normal volunteers and 14 patients with other thyroid diseases (eight with multinodular goiter, four with focal masses, and two with papillary thyroid carcinoma). All 16 Graves disease patients exhibited a pulsatile pattern we call "thyroid inferno." This pattern consists of multiple small areas of intrathyroidal flow seen diffusely throughout the gland in both systole and diastole. In systole, both high-velocity flow (color coded white) and lower velocity flow (color coded red and blue) were noted. In diastole, fewer areas of flow and lower velocity flow were noted. Patients with Graves disease also exhibited color flow around the periphery of the gland. The inferno pattern did not occur in normal subjects or in patients with other thyroid diseases. On occasion, focal areas of intrathyroidal flow were detected in patients with multinodular goiter and focal thyroid masses. High-resolution gray-scale images did not show the small vascular channels from which the flow signal originated. Color-flow Doppler sonography shows promise as a cost-effective, noninvasive technique for diagnosing Graves disease.

  12. Color Doppler sonography and angioscintigraphy in hepatic Hodgkin's lymphoma

    Institute of Scientific and Technical Information of China (English)

    Mirjana V Stojkovi(c); Vera M Artiko; Irena B Radoman; Slavko J Kne(z)evi(c); Snezana M Luki(c); Mirko D Kerkez; Nebojsa S Leki(c); Andrija A Anti(c); Marinko M (Z)vela; Vitomir I Rankovi(c); Milorad N Petrovi(c); Dragana P (S)obi(c); Vladimir B Obradovi(c)

    2009-01-01

    AIM: To estimate the characteristics of Color Doppler findings and the results of hepatic radionuclide angiography (HRA) in secondary Hodgkin's hepatic lymphoma.METHODS: The research included patients with a diagnosis of Hodgkin's lymphoma with metastatic focal lesions in the liver and controls. Morphologic characteristics of focal liver lesions and hemodynamic parameters were examined by pulsed and Color Doppler in the portal, hepatic and splenic veins were examined. Hepatic perfusion index (HPI) estimated by HRA was calculated.RESULTS: In the majority of patients, hepatomegaly was observed. Lesions were mostly hypoechoic and mixed, solitary or multiple. Some of the patients presented with dilated splenic veins and hepatofugal blood flow. A pulse wave was registered in the centre and at the margins of lymphoma. The average velocity of the pulse wave was higher at the margins ( P >0.05). A continuous venous wave was found only at the margins of lymphoma. There was no linear correlation between lymphoma size and velocity of pulse and continuous wave ( r = 390, P < 0.01). HPI was significantly lower in patients with lymphomas than in controls ( P < 0.05), pointing out increased arterial perfusion in comparison to portal perfusion.CONCLUSION: Color Doppler ultrasonography is a sensitive method for the detection of neovascularization in Hodgkin's hepatic lymphoma and estimation of its intensity. Hepatic radionuclide angiography can additionally help in the assesment of vascularisation of liver lesions.

  13. Adaptive clutter rejection for ultrasound color Doppler imaging

    Science.gov (United States)

    Yoo, Yang Mo; Managuli, Ravi; Kim, Yongmin

    2005-04-01

    We have developed a new adaptive clutter rejection technique where an optimum clutter filter is dynamically selected according to the varying clutter characteristics in ultrasound color Doppler imaging. The selection criteria have been established based on the underlying clutter characteristics (i.e., the maximum instantaneous clutter velocity and the clutter power) and the properties of various candidate clutter filters (e.g., projection-initialized infinite impulse response and polynomial regression). We obtained an average improvement of 3.97 dB and 3.27 dB in flow signal-to-clutter-ratio (SCR) compared to the conventional and down-mixing methods, respectively. These preliminary results indicate that the proposed adaptive clutter rejection method could improve the sensitivity and accuracy in flow velocity estimation for ultrasound color Doppler imaging. For a 192 x 256 color Doppler image with an ensemble size of 10, the proposed method takes only 57.2 ms, which is less than the acquisition time. Thus, the proposed method could be implemented in modern ultrasound systems, while providing improved clutter rejection and more accurate velocity estimation in real time.

  14. Sevoflurane Used for Color Doppler Ultrasound Examination in Children.

    Science.gov (United States)

    Fan, Conghai; Zhang, Fengchao; Huang, Xiaomei; Wen, Cheng; Shan, Chengjing

    2015-05-01

    The objective of this study is to investigate the feasibility of sevoflurane inhalation in pediatric color doppler ultrasound examination. In this study, 30 cases of children under 1 year were selected. They were all I or II levels according to American Society of Anesthesiology. Children with severe cyanotic congenital heart disease or severe pneumonia were excluded. All the children received anesthesia with sevoflurane. The University of Michigan Sedation Scale was assessed and bispectral index (BIS) was recorded before induction (T0), after induction (T1), when maintaining (T2), and when waking-up (T3). Blood pressure and heart rate were monitored during the color doppler ultrasound examination, the time to receive sedation examination and anesthesia recovery time were also recorded. (1) Score for UMSS was zero at T0 and 3 at T1; (2) BIS value was 93.18 ± 2.94 at T0 and decreased to 87.6 ± 3.9 at T1; (3) Blood pressure or heart rate did not decline obviously; (4) The time to receive sedation examination was 46.4 ± 13.1 s and anesthesia recovery time was 7.8 ± 5.3 min. In conclusion, sevoflurane can be used in pediatric color doppler ultrasound examination safely and effectively.

  15. Associations between abnormal ultrasound color Doppler measures and tendon pain symptoms in badminton players during a season

    DEFF Research Database (Denmark)

    Boesen, Anders Ploug; Boesen, Morten Ilum; Torp-Pedersen, Soren

    2012-01-01

    Color Doppler ultrasound is widely used to examine intratendinous flow in individuals with overuse tendon problems, but the association between color Doppler and pain is still unclear.......Color Doppler ultrasound is widely used to examine intratendinous flow in individuals with overuse tendon problems, but the association between color Doppler and pain is still unclear....

  16. EVALUATION OF THE DIAGNOSTIC CRITERIA FOR THE LOCALIZATION OF ACQUIRED ARTERIOVENOUS FISTULAS BY COLOR DOPPLER FLOW IMAGING

    Institute of Scientific and Technical Information of China (English)

    李建初; 蔡胜; 姜玉新; 张缙熙; 王岩青

    2001-01-01

    Objective. To evaluate the diagnostic criteria for the localization of acquired arteriovenous fistulas (AVFs)by color Doppler flow imaging (CDFI) based on the features of their hemodynamic changes.Methods. The shape and hemodynamic changes of involved vessels which could be helpful to localize thesites of fistulas were studied according to the observation of 10 cases of acquired AVFs.Results. The s tes of the fistulas could be shown by two-dimensional ultrasonography and color flow imagingin 40% and 80% tases, respectively. In all cases, turbulent high-velocity flow was present at the sites of thefistulas, low resistant flow was present in the arteries proximal to the fistulas, and artery-like flow was detected inthe veins.Conclusion. C OFt was accurate for the localization of acquired AVFs, which were mainly localized by theirhemodynamic changes shown by pulse Doppler ultrasound.``

  17. High Frequency Color Doppler Image of Choroidal Detachment

    Institute of Scientific and Technical Information of China (English)

    Jinghong Wu; Lijuan Zou; Zhongyao Wu; Lixun Cheng

    2000-01-01

    Purpose: To study the Color Doppler Image (CDI) characteristics of choroidal detachment and the applied value of CDI.Methods: Seventy-two cases (74 eyes) of choroidal detachment were studied retrospectively.Results: The typical ultragraph of chroridal detachment displayed one or several smooth hemispherical or lobuler circular thick bands, with convex side toward vitreous cavity. Most of the choroidal detachments were located before the equator, a few of them were beyond the equator. CDI displayed blood flow singnal in the band. Pulse Doppler showed the frequency spectrum features of retinal detachment band were similar to those of central retinal vessels, whereas the frequency spectum features of choroidal detachment bend resembled those of ciliary artery in some cases of retinal detachment (RD) accompanied by choroidal detachment.Conclusion: CDI could make a correct and precise diagnosis of choroidal detachment.Eye Science 2000; 16. 61 ~ 64.

  18. Color doppler energy (CDE) : initial ten-months experience

    Energy Technology Data Exchange (ETDEWEB)

    Ro, Young Jin; Son, Hyun Ju; Lee, Suck Hong; Kim, Byung Soo [Pusan National Univ. College of Medicine, Pusan (Korea, Republic of); Han, Kook Sang; Nam, SAng Hwa; Lee, Keum Seob [Haedong Hospital, Pusan (Korea, Republic of); Shin Se Kwon [Daedong Hospital, Pusan (Korea, Republic of)

    1996-06-01

    Color Doppler imaging(CDI) has shortcomings, including random noise, aliasing, and angle dependence. To overcome these, a method using CD US, termed power doppler or Color Doppler Energy(CDE), has recently been introduced. The purpose of this study was to show the clinical usefulness of CDE. We retrospectively analyzed the CDI and CDE of 61 cases(20 renal pseudotumors, 8 musculoskeletal inflammations, 17 epididymitis or epididymo-orchitis, 3 varicoceles, 1 normal testis, 1 hepatocellualr carcinoma, 7 renal cell carcinoma, 1 renal angiomyolipoma, and 3 splenic varices). CDI and CDE scans were obtained at the same region with constant scan plane. The color gain was increased until noise first became perceptible, and scans were always obtained in such a way that the maximum amount of vascularity was shown. Thereafter, the vascularity, vascular displacement, and the vascular relationship between CDI and CDE were compared. In 17 of 20 cases of pseudotumor in the kidney, normal vascularity was identified in CDI and CDE, but was more cleary visible in CDE. In three cases, there was no visible vascularity in CDI, but normal vascularity in CDE. In eight cases of musculoskeletal inflammation and 17 cases of epididymitis with or without orchitis, the vascularity was increased due to hyperemia, which was more prominently seen in CDE than in CDI. In three varicoceles, CDE appeared to be better in demonstrating low velocity flow. In one patient who was suspected of having acute testicular torsion, CDE was helpful in excluding this suspicion. In one case of hepatocellualr carcinoma, seven cases of renal cell carcinoma, one case of renal angiomyolipoma, and three cases of splenic varices, CDE was better than CDI in showing the vascularity, vascular relationship, and vascular displacement.

  19. Ultrasonography and color Doppler in juvenile idiopathic arthritis

    DEFF Research Database (Denmark)

    Laurell, Louise; Court-Payen, Michel; Nielsen, Susan

    2011-01-01

    hypertrophy, effusion) and by color Doppler (synovial hyperemia) before and 4 weeks after US-guided steroid injection. Results US detected 121 compartments with active disease (joints, tendon sheaths and 1 ganglion cyst). Multiple compartments were involved in 80% of the ankle regions. The talo-crural joint...... inflammation in the ankle region of JIA patients. The talo-crural joint was not always involved. Disease was frequently found in compartments difficult to evaluate clinically. US enabled exact guidance of steroid injections, gave a low rate of subcutaneous atrophy and was proved valuable for follow...

  20. [Color Doppler ultrasound of the scalp and hair].

    Science.gov (United States)

    Wortsman, X; Roustan, G; Martorell, A

    2015-11-01

    Color Doppler ultrasound is an imaging technique that allows the study of frequent diseases of the scalp and hair. This examination provides anatomical and functional information in real time that can reveal the extent, activity or severity of common diseases in a non-invasive way, and allows monitoring of their treatment. Copyright © 2015 Academia Española de Dermatología y Venereología. Published by Elsevier España, S.L.U. All rights reserved.

  1. Dynamic color Doppler sonography in the assessment of erectile dysfunctions; Utilizzazione dell'eco color Doppler dinamico del pene nello studio delle disfunzioni erettili

    Energy Technology Data Exchange (ETDEWEB)

    Aversa, A.; Bonifacio, V.; Isidori, A.; Fabbri, A. [Rome Univ. (Italy). Cattedra di Andrologia. Dipt. di Fisiopatologia Medica; Bertucci, B. [Azienda Ospedaliera Pugliese Ciaccio, Catanzaro (Italy). Servizio di Radiologia

    1999-06-01

    The authors investigated the diagnostic accuracy of dynamic color Doppler sonography (D-CDS) in men with erectile dysfunctions (ED). Terminal microcirculation alterations and their correlation with erectile response after drug testing were investigated with power Doppler energy. Penile sonography in the flaccid state can show calcificic plaques and/or fibrosis of the corpora. Redosing of PGE{sub 1} plus phentolamine during D-CDS is a safe procedure and improves diagnostic accuracy in erectile dysfunctions, with significantly fewer non-responders than redosing of PGE{sub 1} alone. Power Doppler energy shows altered morphology of helicine arterioles otherwise missed at color Doppler and is thus recommended to make an accurate diagnosis in some men with erectile dysfunctions. [Italian] Scopo dello studio e' quello di valutare l'accuratezza diagnostica dell'eco color Doppler dinamico del pene nei soggetti affetti da disfunzione erettile. Inoltre si e' voluto verificale la presenza di alterazioni della vascolarizzazione arteriosa terminale con modulo power Doppler e come la presenza di queste alterazioni del microcircolo si correlino con la risposta erettiva della farmacoinfusione intracavernosa. Con l'eco color Doppler penieno basale e' possibile identificare placche calcifiche e/o fibrosi nei corpi cavernosi. Durante la fase dinamica con color Doppler , la re-iniezione con PGE{sub 1} e fentolamina si e' dimostrata sicura e ha migliorato l'accuratezza diagnostica riducendo il numero di soggetti con mancata risposta erettiva rispetto alla sola PGE{sub 1}. Con power Doppler sono state identificate alterazioni morfologiche delle arterioleelicine non visibili con il color Doppler consentendo la diagnosi piu' precisain alcuni casi di disfunzione erettile.

  2. Simultaneous two-color, two-dimensional angular optical scattering patterns from airborne particulates: Scattering results and exploratory analysis

    Science.gov (United States)

    Holler, Stephen; Fuerstenau, Stephen D.; Skelsey, Charles R.

    2016-07-01

    Light scattering from non-spherical particles and aggregates exhibits complex structure that is revealed only when observed in two angular dimensions (θ, ϕ). However, due to variations in shape, packing, and orientation of such aerosols, the structure of two-dimensional angular optical scattering (TAOS) patterns varies among particles. The spectral dependence of scattering contributes further to the observed complexity, but offers another facet to consider. By leveraging multispectral TAOS data from flowing aerosols, we have identified novel morphological descriptors that may be employed in multivariate statistical algorithms for "unknown" particle classification.

  3. Color Doppler ultrasound of the hand: observations on clinical utility in rheumatoid arthritis.

    Science.gov (United States)

    Saadeh, Constantine; Gaylor, Patrick; Lee, Doohi; Malacara, Jan; Gaylor, Michael

    2004-02-01

    The use of ultrasound with color Doppler in the evaluation of rheumatoid arthritis was followed in 25 patients with joint complaints. Small joint ultrasound of the metacarpophalangeal joints (MCPs) as well as the wrists was performed with supplementation by color Doppler. In addition, 6 patients were followed for at least 3 months after start of treatment of rheumatoid arthritis using the same technique. In patients with what appeared to be definite rheumatoid arthritis, ultrasound supported this diagnosis as evidenced by the finding of cortical defects, extensor tendon sheath thickening, and synovial proliferation. Increased activity by color Doppler ultrasonography was the most common finding. Significant decrease in color Doppler activity was noted in the 6 patients who were followed up after 3 months of therapy with disease-modifying agents. Therefore, the use of ultrasound with color Doppler could aid in the diagnosis and follow up of patients with rheumatoid arthritis.

  4. FEASIBILITY STUDY OF AN ULTRASOUND CONTRAST AGENT (LEVOVIST) IN COLOR DOPPLER IMAGING OF LIVER NEOPLASMS

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    @@ The purpose of this study was to determine the efficacy of using an ultrasound contrast agent(levovist)to enhance the color Doppler imaging of liver neoplasms.Thirty patients with hepatic tumors were enrolled in this study.After intravenous administration of levovist,the color Doppler signals of normal hepatic vessels were enhanced.In various hepatic tumors,the different patterns of tumor vascularity were observed,which had not been demonstrated in conventional non-contrast color Doppler imaging.In 11 of 16 patients with hepatocarcinoma,additoal color Doppler signals were observed in the central part of the tumors.On the contrary,3 patients with metastatic liver lesions the enhanced color Doppler signal appear only at the peripheral of tumors.A typical rim-like color enhancement was seen in 2 of the 3 cases.In six patients with hpatic hemangiomas contrast-enhanced color Doppler imaging demonstrated the blood vessels at the margin of the neoplasms.Contrast-enhanced color Doppler imaging improves the visualization of the hepatic neoplasm vascularity.This technique holds great promise for detecting small liver tumors and differentiating hepatic neoplasms.

  5. Transesophageal color Doppler evaluation of obstructive lesions using the new "Quasar" technology.

    Science.gov (United States)

    Fan, P; Nanda, N C; Gatewood, R P; Cape, E G; Yoganathan, A P

    1995-01-01

    Due to the unavoidable problem of aliasing, color flow signals from high blood flow velocities cannot be measured directly by conventional color Doppler. A new technology termed Quantitative Un-Aliased Speed Algorithm Recognition (Quasar) has been developed to overcome this limitation. Employing this technology, we used transesophageal color Doppler echocardiography to investigate whether the velocities detected by the Quasar would correlate with those obtained by continuous-wave Doppler both in vitro and in vivo. In the in vitro study, a 5.0 MHz transesophageal transducer of a Kontron Sigma 44 color Doppler flow system was used. Fourteen different peak velocities calculated and recorded by color Doppler-guided continuous-wave Doppler were randomly selected. In the clinical study, intraoperative transesophageal echocardiography was performed using the same transducer 18 adults (13 aortic valve stenosis, 2 aortic and 2 mitral stenosis, 2 hypertrophic obstructive cardiomyopathy and 1 mitral valve stenosis). Following each continuous-wave Doppler measurement, the Quasar was activated, and a small Quasar marker was placed in the brightest area of the color flow jet to obtain the maximum mean velocity readout. The maximum mean velocities measured by Quasar closely correlated with maximum peak velocities obtained by color flow guided continuous-wave Doppler in both in vitro (0.53 to 1.65 m/s, r = 0.99) and in vivo studies (1.50 to 6.01 m/s, r = 0.97). We conclude that the new Quasar technology can accurately measure high blood flow velocities during transesophageal color Doppler echocardiography. This technique has the potential of obviating the need for continuous-wave Doppler.

  6. [Graves' disease: ultrasonographic, color Doppler and histological aspects].

    Science.gov (United States)

    Messina, G; Viceconti, N; Trinti, B

    1997-11-01

    The aim of the present work was to study the relationship between thyroid low echogenicity, the thyroid blood flow by color-Doppler (CD) and histological features in patients with Graves' disease (GD). Thyroid ultrasonography and CD was performed on 28 patients with GD. In 5 patients has been compared CD with histology. The thyroid volume was higher in 100% of patients with GD at the onset rather than in euthyroidism. Diffuse hypoechogenicity of the thyroid was discovered in 100% of patients with GD at the onset and it persisted in 57.1% of patients that became euthyroid after therapy. Qualitative CD resulted in different patterns that were classified as follow: pattern A ("thyroid inferno") in 17 patients (60.7%); pattern B (mildly increased of parenchymal blood flow) in 11 patients (39.3%). In the 5 histological proven cases, in the pattern A (3 cases) there was a diffuse microfollicular hyperplasia with functional activation notes. There was lymphocytic infiltration. While in the pattern B (two cases) there were a non-follicular hypercellular nodule with pseudocapsule and rare colloid. We conclude that there are two different histological types with different CD patterns in GD.

  7. Color doppler US findings of gestational trophoblastic disease

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jae Hee; Lee, Myung Hee; Kim, Jee Young; Jung, Jae Keun; Shin, Kyung Sub [Catholic University College of Medicine, Seoul (Korea, Republic of)

    1994-12-15

    The purpose of this study were to evaluate the findings of gestational trophoblastic disease(GTD) at color Doppler imaging (CDI) and to assess the role of CDI in differentiating gestational trophoblastic tumor (GTT) from hydatidiform mole (H-mole). CDI findings of 18 patients with H-mole and 52 patients with GTT were reviewed. Masswas detected in 43(82,7%) patients with GTT. Thirty seven out of 43 masses showed varying degree of intratumoral flows. mean resistive index (RI) of intratumoral flow was 0.39+0.15. H-mole manifestated as a characteristic vesicular mass in 6 patients without history of curretage, while there was no definable mass in 12 patients with history of curretage. The masses of H-mole did not show intratumoral flow. Hypervascularity of adnexae was detected in 44 (84.6%) patients with GTT, whereas only six (33.3%) patients with H-mole showed minimalhypervascularity of adnexae. Mean RI of uterine arteries was 0.69+0.13 in GTT and 0.70+0.15 in H-mole. CDI findings of mass in the uterus, hypervascularity of adnexal region and intramural vessels in patients suspected to have GTD clinically, may suggest GTT. In conclusion, CDI was helpful in the diagnosis of GTD and the differentiation between H-mole and GTT

  8. Using rotation for steerable needle detection in 3D color-Doppler ultrasound images.

    Science.gov (United States)

    Mignon, Paul; Poignet, Philippe; Troccaz, Jocelyne

    2015-08-01

    This paper demonstrates a new way to detect needles in 3D color-Doppler volumes of biological tissues. It uses rotation to generate vibrations of a needle using an existing robotic brachytherapy system. The results of our detection for color-Doppler and B-Mode ultrasound are compared to a needle location reference given by robot odometry and robot ultrasound calibration. Average errors between detection and reference are 5.8 mm on needle tip for B-Mode images and 2.17 mm for color-Doppler images. These results show that color-Doppler imaging leads to more robust needle detection in noisy environment with poor needle visibility or when needle interacts with other objects.

  9. Testicular relapse of acute lymphocytic leukemia: Usefulness of color and power Doppler sonography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kwang Hun; Yoon, Choon Sik; Lee, Sung Il; Kim, Myung Joon [Yonsei University College of Medicine, Seoul (Korea, Republic of); Yang, Chang Hyun [Yang Dong Hospital, Yonsei University College of Medicine, Seoul (Korea, Republic of)

    1999-09-15

    To evaluate the usefulness of color and power Doppler sonography in detecting testicular relapse of leukemia. Both gray- scale and color (power) Doppler ultrasound (US) were performed in seven patients. Two additional patients examined by gray-scale US only were included. The patients were 4-14 years old (mean age, 9 years). Ten tests were confirmed to have leukemic relapse, eight by pathology and two by clinical evidence. Gray-scale US showed variable findings: heterogeneous hypoechogenicity (5) and homogeneous isoechogenicity (5). In all seven patients (8 tests) who underwent both color and power Doppler US, diffuse and marked hypervascularity was demonstrated. One case showed enlarged epididymis with heterogeneous echogenicity, which was the same character as the involved testis. Color and power Doppler US are useful methods in the identification of the testicular relapse of leukemia by demonstrating diffuse, marked hypervascularity in the proper clinical settings.

  10. Research on Digital Watermarking Algorithm Based on Color Two-dimensional Code Image%基于彩色二维码图像的数字水印算法研究

    Institute of Scientific and Technical Information of China (English)

    吕慧中; 蓝凤华; 李宏昌

    2015-01-01

    This paper introduces the color two-dimensional code on the basis of introducing the traditional black and white two-dimensional code. The two dimensional code is changed into color to provide more watermark embedding position and higher visibility. The MATLAB simulation experiment proves the feasibility of embedding the watermark information in the two-dimensional code. Based on characteristics of color two-dimensional code, this paper studies the application of digital watermark in color two-dimensional code. By embedding watermark through through R, G, B color component translation and rotation, this paper designs a watermarking algorithm based on the color two-dimensional code, which can resist geometric attacks and improve the security and practicability of two-dimensional code.%在介绍了传统黑白二维码的基础上,对彩色二维码进行了介绍.将二维码变成彩色,提供了更多的水印嵌入位置和更高的不可见性.通过Matlab仿真实验,验证了在彩色二维码中嵌入水印信息的可行性,并结合彩色二维码的特点,对数字水印在彩色二维码中的应用进行研究,采用R、G和B三种颜色分量分别平移和旋转的方法嵌入水印,设计出了一种可抵抗几何攻击的彩色二维码水印算法,提高了二维码的安全性和实用性.

  11. Color image encryption by using Yang-Gu mixture amplitude-phase retrieval algorithm in gyrator transform domain and two-dimensional Sine logistic modulation map

    Science.gov (United States)

    Sui, Liansheng; Liu, Benqing; Wang, Qiang; Li, Ye; Liang, Junli

    2015-12-01

    A color image encryption scheme is proposed based on Yang-Gu mixture amplitude-phase retrieval algorithm and two-coupled logistic map in gyrator transform domain. First, the color plaintext image is decomposed into red, green and blue components, which are scrambled individually by three random sequences generated by using the two-dimensional Sine logistic modulation map. Second, each scrambled component is encrypted into a real-valued function with stationary white noise distribution in the iterative amplitude-phase retrieval process in the gyrator transform domain, and then three obtained functions are considered as red, green and blue channels to form the color ciphertext image. Obviously, the ciphertext image is real-valued function and more convenient for storing and transmitting. In the encryption and decryption processes, the chaotic random phase mask generated based on logistic map is employed as the phase key, which means that only the initial values are used as private key and the cryptosystem has high convenience on key management. Meanwhile, the security of the cryptosystem is enhanced greatly because of high sensitivity of the private keys. Simulation results are presented to prove the security and robustness of the proposed scheme.

  12. Experimental verification of color flow imaging based on wideband Doppler method.

    Science.gov (United States)

    Tanaka, Naohiko

    2014-01-01

    The purpose of this study is to eliminate the aliasing in color flow imaging. The wideband Doppler method is applied to generate a color flow image, and the validity of the method is experimentally confirmed. The single beam experiment is carried out to confirm the velocity estimation based on the wideband Doppler method. The echo data for the conventional pulsed Doppler method and the wideband Doppler method are obtained using a flow model, and the estimated velocity for each method is compared. The color flow images for each method are also generated using several types of flow model. The generated images are compared, and the characteristics of the imaging based on the wideband Doppler method are discussed. The high velocity beyond the Nyquist limit is successfully estimated by the wideband Doppler method, and the availability in low velocity estimation is also confirmed. The aliasing in color flow images is eliminated, and the generated images show the significance of the elimination of the aliasing in the flow imaging. The aliasing in color flow imaging can be eliminated by the wideband Doppler method. This technique is useful for the exact understanding of blood flow dynamics.

  13. Single-lens Fourier-transform-based optical color image encryption using dual two-dimensional chaotic maps and the Fresnel transform.

    Science.gov (United States)

    Su, Yonggang; Tang, Chen; Li, Biyuan; Chen, Xia; Xu, Wenjun; Cai, Yuanxue

    2017-01-20

    We propose an optical color image encryption system based on the single-lens Fourier transform, the Fresnel transform, and the chaotic random phase masks (CRPMs). The proposed encryption system contains only one optical lens, which makes it more efficient and concise to implement. The introduction of the Fresnel transform makes the first phase mask of the proposed system also act as the main secret key when the input image is a non-negative amplitude-only map. The two CRPMs generated by dual two-dimensional chaotic maps can provide more security to the proposed system. In the proposed system, the key management is more convenient and the transmission volume is reduced greatly. In addition, the secret keys can be updated conveniently in each encryption process to invalidate the chosen plaintext attack and the known plaintext attack. Numerical simulation results have demonstrated the feasibility and security of the proposed encryption system.

  14. Duplex Color Doppler Evaluation of Retinal Arterial Blood Flow in Type 2 Diabetic Subjects without Retinopathy

    Directory of Open Access Journals (Sweden)

    Mashah Binte Amin

    2014-09-01

    Full Text Available Background: Diabetic retinopathy is a vascular disorder affecting the microvasculature of retina. It is caused by changes in the blood vessels of retina. If untreated, it may lead to blindness which is usually preventable if retinopathy is diagnosed early and treated promptly. In ophthalmology, color Doppler imaging is a new method that enables us to assess the orbital vasculature. It allows for simultaneous two dimensional anatomical and Doppler evaluations of hemodynamic characteristics of retinal artery. Objective: To observe the difference between Doppler flow velocity indices (peak systolic velocity, end diastolic velocity and resistive index of retinal artery in type 2 diabetic subjects without retinopathy and those of normal controls. Materials and Methods: This case-control study was carried out in the department of Radiology and Imaging, Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders (BIRDEM in collaboration with Ophthalmology Outpatient Department, BIRDEM, Dhaka from July 2011 to June 2013. Eighty diabetic patients without retinopathy aged 27–68 years were enrolled as cases and age and sex matched 80 healthy subjects were selected as controls. Type 1 diabetic patients, type 2 diabetics with retinopathy, hypertensive and dyslipidemic subjects were excluded from the study. All the selected subjects underwent duplex Doppler ultrasonography of both eyes using 5 to 7.5 MHZ linear phase transducer. Duplex color Doppler findings including spectral analysis (PSV, EDV and RI were recorded. Unpaired t test was done to compare blood flow velocity indices of retinal artery in type 2 diabetic patients without retinopathy and that of healthy control subjects. p value <0.05 was considered as significant. Results: Majority (42.5% and 47.5% of subjects were in 4th decade of life in both groups with predominance of males. The mean duration of diabetes was 4.56 ± 2.1 years. Mean peak systolic

  15. Use of ultrasound, color Doppler imaging and radiography to monitor periapical healing after endodontic surgery.

    Science.gov (United States)

    Tikku, Aseem P; Kumar, Sunil; Loomba, Kapil; Chandra, Anil; Verma, Promila; Aggarwal, Renu

    2010-09-01

    This study evaluated the effectiveness of ultrasound, color Doppler imaging and conventional radiography in monitoring the post-surgical healing of periapical lesions of endodontic origin. Fifteen patients who underwent periapical surgery for endodontic pathology were randomly selected. In all patients, periapical lesions were evaluated preoperatively using ultrasound, color Doppler imaging and conventional radiography, to analyze characteristics such as size, shape and dimensions. On radiographic evaluation, dimensions were measured in the superoinferior and mesiodistal direction using image-analysis software. Ultrasound evaluation was used to measure the changes in shape and dimensions on the anteroposterior, superoinferior, and mesiodistal planes. Color Doppler imaging was used to detect the blood-flow velocity. Postoperative healing was monitored in all patients at 1 week and 6 months by using ultrasound and color Doppler imaging, together with conventional radiography. The findings were then analyzed to evaluate the effectiveness of the 3 imaging techniques. At 6 months, ultrasound and color Doppler imaging were significantly better than conventional radiography in detecting changes in the healing of hard tissue at the surgical site (P < 0.004). This study demonstrates that ultrasound and color Doppler imaging have the potential to supplement conventional radiography in monitoring the post-surgical healing of periapical lesions of endodontic origin.

  16. Significance of color doppler ultrasonography in the assessment of pancreatic carcinoma vascular invasion

    Directory of Open Access Journals (Sweden)

    Alempijević Tamara

    2006-01-01

    Full Text Available Background/Aim. It is highly appreciated to provide exact data on vascular invasion of pancreatic carcinoma relying as much as possible on non-invasive diagnostic procedures. Color Doppler ultrasonography has been proven as an efficient method for clinical staging of pancreatic carcinoma essential for therapeutic decisions. The aim of this study was to provide an analysis of the sensitivity and specificity for color Doppler ultrasonography in patients suffering from pancreatic carcinoma. Methods. We performed color Doppler ultrasonography examination in 43 patients with pancreatic carcinoma prior to the surgery. The findings of ultrasonography on neoplasm vascular invasion were correlated to the findings obtained during the subsequent surgical procedures. An estimation of neoplastic invasion of certain blood vessels including portal vein, celiac trunk, and superior mesenteric artery and vein is critical for decision making regarding surgical treatment. The patients with metastases of pancreatic carcinoma were excluded from the study. Results. Comparing color Doppler and the surgical findings we estimated the sensitivity for detection of neoplastic vascular invasion ranging from 79−93%, whereas the specificity range was from 83−93%. Conclusion. Color Doppler ultrasonography is a sufficiently sensitive and specific method for evaluation of vascular invasion in pancreatic carcinoma patients. Since color Doppler ultrasonography is a non-invasive, radiation free, and inexpensive diagnostic tool, considering also the results of this and similar studies we could strongly recommend its use for an initial presurgical evaluation of vascular invasion in pancreatic carcinoma patients.

  17. General principles of carotid Doppler ultrasonography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Whal [Dept. of Radiology, Seoul National University College of Medicine, Seoul (Korea, Republic of)

    2014-03-15

    Carotid Doppler ultrasonography is a popular tool for evaluating atherosclerosis of the carotid artery. Its two-dimensional gray scale can be used for measuring the intima-media thickness, which is very good biomarker for atherosclerosis and can aid in plaque characterization. The plaque morphology is related to the risk of stroke. The ulceration of plaque is also known as one of the strong predictors of future embolic event risk. Color Doppler ultrasonography and pulse Doppler ultrasonography have been used for detecting carotid artery stenosis. Doppler ultrasonography has unique physical properties. The operator should be familiar with the physics and other parameters of Doppler ultrasonography to perform optimal Doppler ultrasonography studies.

  18. Analysis of the Effect of the Application of Four-dimensional Color Doppler Ultrasound in Prenatal Screening of Fetal Malformation%产前胎儿畸形筛查中四维彩超的应用效果分析

    Institute of Scientific and Technical Information of China (English)

    纪亚梅; 王文俊

    2016-01-01

    目的:探讨产前胎儿畸形筛查中四维彩超的应用效果。方法方便选取2013年1月—2016年2月在该院进行产前筛查的2200例中晚期孕妇作为研究对象,分别对其进行二维彩超及四维彩超检查,根据胎儿出生后情况或引产结果对二维彩超及四维彩超的检出率进行比较。结果二维彩超对胎儿畸形的检出率为76.92%(40/52),四维彩超对胎儿畸形的检出率为96.15%(50/52),四维彩超对胎儿畸形的检出率明显高于二维彩超(P﹤0.01)。结论与二维彩超相比,四维彩超在胎儿畸形检出方面具有明显优势,值得临床推广应用。%Objective To investigate the application effect of four dimensional color Doppler ultrasound in prenatal screen-ing of fetal malformation. Methods 2 200 cases of advanced pregnant women from January 2013 to February 2016 in our hospital were selected as research subjects. Two dimensional color Doppler ultrasound and four-dimensional color Doppler ultrasound examination were carried out on them. According to the results of the fetus after birth or induction of labor, the detection rate of two-dimensional color Doppler ultrasound and four-dimensional color Doppler ultrasound were compared. Results The detection rate of two-dimensional color Doppler ultrasound for fetal malformation was 76.92%(40/52), while that of four-dimensional color Doppler ultrasound was 96.15%(50/52). Thus the detection rate of four-dimensional color Doppler ultrasound was obviously higher than that of two-dimensional color Doppler ultrasound(P﹤0.01). Conclusion Com-pared with two-dimensional ultrasound, four-dimensional color Doppler ultrasound in the detection of fetal abnormalities has obvious advantages, which is worth clinical application.

  19. CT angiography and Color Doppler ultrasonography features and sensitivity in detection of carotid arteries diseases

    Directory of Open Access Journals (Sweden)

    Samir Kamenjaković

    2013-04-01

    Full Text Available Introduction: The aim of this research was to compare specifi city and sensitivity of Color Doppler ultrasonographywith CT angiography.Methods: A total of one hundred patients suffering from carotid artery disease (n=200 were tested in this research in the period from June till October, 2011. Average age of the patients was 61.5 years, and most of the patients were in the age group ranging from 55 to 65 years. The level of carotid artery stenosis is measured according to Standards of the North America Symptomatic Carotid Endarterectomy Trail study,by method of Color Doppler ultrasonography and CT angiography.Results: Stenosis <50% registered by Doppler ultrasonography was found in 62% and by CT angiography in 64% patients. Stenosis from 70 to 79% registered by Doppler ultrasonography was found in 88% and by CT angiography in 82% patients. In patients with level of stenosis 70-79% there was a tendencyof registering the stenosis to be higher by Color Doppler ultrasonography, than by CT angiography. In the case of the occlusion, there was also the similar observation, with variation of 8% carotid arteries.Conclusion: Extracranial Doppler and color duplex ultrasound enable reliable detection of both stenosis and occlusion of carotid arteries and accordingly they occupy an important place in radiological algorithm. When it comes to CT angiography it can be concluded that it can provide accurate and exact information regarding the condition of blood vessels as good as Digital Subtractive Angiography can.

  20. The impacts of piezoelectric element's defects on color and power doppler images

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Kyung Sung [Dept. of Radiotechnology, Cheju Halla University, Cheju (Korea, Republic of)

    2015-12-15

    An ultrasound probe has a big impact on Doppler images even though it has very high risk of frequent function-breakdowns occurring in medical ultrasound scanners. This study experimentally analyses the impacts of an ultrasonic probe’s defected elements on power and color Doppler images. The results show that, the bigger the size of defected probe elements is, and the closer a group of action elements is to the center, the more the brightness of images and the velocity of Doppler diminish. When elements’ defects increase in color and power Doppler images, false images are formed to be mistaken for blood-vessel plaque in neighboring regions. Accordingly, whenever element defects are suspected, we need check-up process in B-mode. From this respective, it is advisable to have primary interest in a probe and carry out continuous probe QA for ultrasonography.

  1. Color Doppler Imaging in the Diagnosis and Follow-up of Carotid Cavernous Sinus Fistulas

    Institute of Scientific and Technical Information of China (English)

    1993-01-01

    This report describes color doppler imaging (CDI) in theevaluation and follow-up of nine patients with carotid cavernous sinusfistulas.The orbits and carotid arteries were examined with CDI.In allcases,the diagnosis was confirmed by angiography.CDI clearlydemonstrated the dilated superior ophthalmic veins (SOVs) with retrogradeflow and low resistance arterial doppler waveform in all nine patients (10eyes).After the study of quantitative hemodynamics,we found that directcarotid cavernous sinus fistulas s...

  2. Laparoscopic splenectomy: color Doppler flow imaging for preoperative evaluation

    Institute of Scientific and Technical Information of China (English)

    XU Wei-li; LI Suo-lin; WANG Yan; SHI Bao-jun; LI Meng; LI Ying-chao; ZHONG Zhi-yong; LI Zhen-dong

    2009-01-01

    Background Laparoscopic splenectomy (LS) is currently the standard approach for resection of a normal-sized spleen.However, this method becomes technical challenge in cases of splenomegaly due to intraoperative hemorrhage. A complete understanding of the splenic vessel anatomy is important to facilitate the difficult laparoscopic procedure. In this retrospective study, we examined the role of color Doppler flow imaging (CDFI) in splenic vessel anatomy and evaluated its value for LS.Methods Forty-eight patients who underwent splenectomy for various hematologic and autoimmune disorders from May 2004 to December 2007 were enrolled in this study. Twenty-three patients underwent preoperative CDFI examination that included examination of the anatomic type of splenic pedicle, the adjacent relationship between the splenic vessel and pancreas, and spleen size (CDFI group). In the remaining 25 patients, ultrasonic inspections of the splenic vessel were not performed (non-CDFI group). Laparoscopic splenectomies in the CDFI group were performed in accordance with the information provided by the preoperative CDFI in each patient. In the non-CDFI group, LS was performed according to the conventional method. In the CDFI group, the constituent ratios of the above-mentioned parameters by CDFI were compared with those recorded during LS using the chi square test. The effectiveness of the technique on surgery in both groups was compared with an independent sample Student's ttest.Results All laparoscopic splenectomies in both groups were performed successfully. However, 2 cases in the non-CDFI group were converted to LS with the assistance of micro-incision because the branches of the splenic vein were inadvertently torn. Two anatomic types of splenic pedicle and four different adjacent relationships between the splenic vessel and pancreas were detected by CDFI. About 80% of spleens fit the criteria of megalosplenia. There were no statistically significant differences between the

  3. [Echo-color Doppler in the study of hypothyroidism in the adult].

    Science.gov (United States)

    Lagalla, R; Caruso, G; Benza, I; Novara, V; Calliada, F

    1993-09-01

    Color-Doppler US was performed on 20 patients with sub-clinic hypothyroidism which had been confirmed by laboratory tests. In all cases, color-Doppler US showed increased parenchymal flow, whose semiology was similar to the one known as "thyroid inferno" and currently associated, in the literature, with diffuse hyperfunction conditions. Quantitative measurements yielded no further element for differential diagnosis, while showing high flow speeds which were similar to those in hyperfunction. On the basis of consequent physiopathologic considerations, hypervascularization, as observed in hypothyroidism, is likely to be referred to the hypertrophic action of TSH, which was reported as high in all patients. In conclusion, the color-Doppler "thyroid inferno" pattern, which has been to date considered as specific of thyroid hyperfunction, has lost part of its diagnostic specificity, and further investigation--e.g. hormonal titers, scintigraphy--is needed for an unquestionable diagnosis to be made.

  4. Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional Magnetic Doppler Imaging in all four Stokes parameters

    CERN Document Server

    Rusomarov, N; Ryabchikova, T; Piskunov, N

    2014-01-01

    Aims: We present a magnetic Doppler imaging study from all Stokes parameters of the cool, chemically peculiar star HD 24712. This is the very first such analysis performed at a resolving power exceeding 10^5. Methods: The analysis is performed on the basis of phase-resolved observations of line profiles in all four Stokes parameters obtained with the HARPSpol instrument attached at the 3.6-m ESO telescope. We use the magnetic Doppler imaging code, INVERS10, which allows us to derive the magnetic field geometry and surface chemical abundance distributions simultaneously. Results: We report magnetic maps of HD 24712 recovered from a selection of FeI, FeII, NdIII, and NaI lines with strong polarization signals in all Stokes parameters. Our magnetic maps successfully reproduce most of the details available from our observation data. We used these magnetic field maps to produce abundance distribution map of Ca. This new analysis shows that the surface magnetic field of HD 24712 has a dominant dipolar component wit...

  5. Ultrasonography and color Doppler in juvenile idiopathic arthritis

    DEFF Research Database (Denmark)

    Laurell, Louise; Court-Payen, Michel; Nielsen, Susan;

    2012-01-01

    The wrist region is one of the most complex joints of the human body. It is prone to deformity and functional impairment in juvenile idiopathic arthritis (JIA), and is difficult to examine clinically. The aim of this study was to evaluate the role of ultrasonography (US) with Doppler in diagnosis...

  6. Diagnosis of Cervical Abortion by TransvaginaI Color Doppler Sonography : A Case Report

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Eun Ju; Ryu, Hee Sug; Ji, Hoon; Suh, Jung Ho [Ajou University College of Medicine, Suwon (Korea, Republic of)

    1995-12-15

    Cervical abortion is a spontaneous abortion of an intrauterine pregnancy into the cervical canal where the abortus is retained by a closed external os, causing distension of the cervical canal. Cervical abortion should be distinguished from the cervical pregnancy. We present a case of cervical abortion diagnosed preoperatively by transvaginal sonography and color doppler imaging, and treated by dilatation and curettage. Charateristic transvaginal sonographic findings and identification of subtrophoblastic blood flow by color doppler imaging could allow differentiation of the cevical aborition from the cervical pregnancy

  7. Using Rotation for Steerable Needle Detection in 3D Color-Doppler Ultrasound Images

    OpenAIRE

    Mignon, Paul; Poignet, Philippe; Troccaz, Jocelyne

    2015-01-01

    International audience; This paper demonstrates a new way to detect needles in 3D color-Doppler volumes of biological tissues. It uses rotation to generate vibrations of a needle using an existing robotic brachytherapy system. The results of our detection for color-Doppler and B-Mode ultrasound are compared to a needle location reference given by robot odometry and robot ultrasound calibration. Average errors between detection and reference are 5.8 mm on needle tip for B-Mode images and 2.17 ...

  8. Color Doppler Ultrasonography-Targeted Perforator Mapping and Angiosome-Based Flap Reconstruction

    DEFF Research Database (Denmark)

    Gunnarsson, Gudjon Leifur; Tei, Troels; Thomsen, Jørn Bo

    2016-01-01

    Knowledge about perforators and angiosomes has inspired new and innovative flap designs for reconstruction of defects throughout the body. The purpose of this article is to share our experience using color Doppler ultrasonography (CDU)-targeted perforator mapping and angiosome-based flap reconstr......Knowledge about perforators and angiosomes has inspired new and innovative flap designs for reconstruction of defects throughout the body. The purpose of this article is to share our experience using color Doppler ultrasonography (CDU)-targeted perforator mapping and angiosome-based flap...

  9. High-Frequency Color Doppler Sonography of Bullous Pemphigoid: Correlation With Histologic Findings.

    Science.gov (United States)

    Porriño-Bustamante, María Librada; Alfageme, Fernando; Suárez, Lola; de Domingo, María Antonia González; Hospital, Mercedes; Roustán, Gastón

    2016-08-01

    Bullous pemphigoid is the most frequent autoimmune-mediated blistering skin disease, belonging to the group of subepidermal bullae. We performed high-frequency color Doppler sonography in 3 cases of bullous pemphigoid, in bullous and adjacent non-bullous skin, which showed homogeneous sonographic findings. Subepidermal cystic structures with dermal hypoechogenicity were observed in bullous skin. In nonbullous skin, the dermis showed hypoechogenicity compared to normal skin. Color Doppler signals were increased in both areas. These findings correlate histologically with subepidermal bullae and dermal inflammatory infiltrates.

  10. Low Complexity Direction and Doppler Frequency Estimation for Bistatic MIMO Radar in Spatial Colored Noise

    Directory of Open Access Journals (Sweden)

    Lingyun Xu

    2014-01-01

    Full Text Available We investigate the algorithm of direction and Doppler frequency estimation for bistatic multiple-input multiple-output (MIMO radar in spatial colored noise. A novel method of joint estimation of direction and Doppler frequency in spatial colored noise based on propagator method (PM for bistatic MIMO radar is discussed. Utilizing the cross-correlation matrix which is formed by the adjacent outputs of match filter in the time domain, the special matrix is constructed to eliminate the influence of spatial colored noise. The proposed algorithm provides lower computational complexity and has very close parameters estimation compared to estimation of signal parameters via rotational invariance technique (ESPRIT algorithm in high signal-to-noise ratio (SNR. It is applicable even if the transmitted waveforms are not orthogonal. The estimated parameters can be paired automatically and the Cramér-Rao Bound (CRB is given in spatial colored noise. Simulation results confirm the effectiveness of the proposed method.

  11. Color Doppler US in extra-articular rheumatoid arthritis. Early results; L'eco Doppler nell'artrite reumatoide con localizzazione extra-articolare: esperienza preliminare

    Energy Technology Data Exchange (ETDEWEB)

    Midiri, M. [Bari Politcenico, Bari (Italy). Ist. di Radiologia; Iovane, A.; Finazzo, M.; Brancatelli, G.; Gallo, C.; Lagalla, R. [Palermo Politecnico Universitario Paolo Giaccone, Palermo (Italy). Ist. di Radiologia

    1999-09-01

    The paper investigates the role of color and power Doppler imaging in staging extra-articular involvement, monitoring local inflammatory changes and drug treatment response. [Italian] Scopo del lavoro e' quello di analizzare l'introduzione dell'ecografia con color power Doppler, che offre possibilita' di integrazione dell'ecografia, con particolare riferimento alla dimostrazione del grado di coinvolgimento extra-articolare, allo stato evolutivo, della flogrosi locale e alla risposta al trattamento farmacologico.

  12. The efficacy of magnetic resonance imaging and color Doppler ultrasonography in diagnosis of salivary gland tumors.

    Science.gov (United States)

    Davachi, Behrooz; Imanimoghaddam, Mahrokh; Majidi, Mohamad Reza; Sahebalam, Ahmad; Johari, Masoomeh; Javadian Langaroodi, Adineh; Shakeri, Mohamad Taghi

    2014-01-01

    Background and aims. Although salivary gland tumors are not very common, early diagnosis and treatment is crucial because of their proximity to vital organs, and therefore, determining the efficacy of new imaging procedures becomes important. This study aimed to evaluate the efficacy of magnetic resonance imaging (MRI) and color doppler ultrasonography parameters in the diagnosis and differentiation of benign and malignant salivary gland tumors. Materials and methods. In this cross-sectional study, color doppler ultrasonography and MRI were performed for 22 patients with salivary gland tumor. Demographic data as well as MRI, color doppler ultrasonography, and surgical parameters including tumor site, signal in MRI images, ultrasound echo, tumor border, lymphadenopathy, invasion, perfusion, vascular resistance index (RI), vascular pulse index (PI) were analyzed using Chi-square test, Fisher's exact test, and independent t-test. Results. The mean age of patients was 46.59±13.97 years (8 males and 14females). Patients with malignant tumors were older (P color doppler ultrasonography in determining tumor site was 100% and 95%, respectively. No significant difference observed between RI and PI and the diagnosis of tumor. Conclusion. Both MRI and ultrasonography have high accuracy in the localization of tumors. Well-identified border was a sign of benign tumors. Also, invasion to adjacent structures was a predictive factor for malignancy.

  13. Color doppler ultrasound and quantitative histologic study of angiogenesis in ovarian tumors.

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Objective: To investigate whether there is any correlation between minimum resistance index (RImin) and mierovessel density (MVD) in ovarian tumors. Methods: The intratumor artery RImin of 61 patients with ovarian tumor was measured by color doppler ultra-sound (CDU) preoperatively. MVD i-

  14. Color doppler findings of gastric varices compared with findings on computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Sato, Takahiro; Yamazaki, Katsu; Toyota, Jouji; Karino, Yoshiyasu; Ohmura, Takumi; Suga, Toshihiro [Sapporo Kosei General Hospital (Japan)

    2002-08-01

    The aim of this study was to evaluate the hemodynamics of gastric varices. We evaluated the detection rates of gastric varices, inflowing vessels to gastric varices, and outflowing vessels from gastric varices in 24 patients with gastric varices, using color Doppler sonography, and compared these findings with computed tomography findings. Eighteen patients had F2-type varices and 6 had F3-type, classified according to the Japanese Research Society for Portal Hypertension. Fourteen patients had fundal varices, and 10 had cardiac and fundal varices. The detection rates of collateral veins using color Doppler sonography were as follows: gastric varices were detected in all 24 patients (100%); inflowing vessels, in 21 of the 24 patients (87.5%); and outflowing vessels, in 18 of the 24 patients (75.0%). The detection rates of collateral veins, using computed tomography, were: gastric varices were detected in all 24 patients (100%); inflowing vessels, in all 24 patients (100%); and outflowing vessles, in 21 of the 24 patients (87.5%). The color Doppler findings agreed perfectly with the computed tomography findings in 13 of the 24 patients (54.2%). Although color Doppler sonography is a useful, noninvasive modality for evaluating the hemodynamics of gastric varices, it falls short in visualizing the detailed hemodynamics of the inflowing and outflowing vessels of gastric varices in half of the patients when compared with computed tomography. (author)

  15. Fibromatosis colli: findings at high-resolution ultrasound and color Doppler images

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Deok Hee; Shin, Myung Jin; Choi, Hye Young; Choi, Soo Na Mi; Kim, Yong Hwan [University of Ulsan College of Medicine, Asan Medical Center, Ulsan (Korea, Republic of)

    1993-12-15

    Fibromatosis colli is a unique mass of sternocleidomastoid muscle, which usually presents in neonatal period and disappears within one year of age. The diagnosis of this disease is not difficult with the findings of ultrasound and the unique clinical behavior of the mass. The purposes of this study are to evaluate the detailed sonographic features of fibromatosis colli and to find the value of color Doppler studies on the initial examinations and the follow-up of the patients. Twenty-four patients who were diagnosed as fibromatosis colli by the clinical history and ultrasound examination were studied. Among them, 11 patients underwent follow-up studies including color Doppler imaging. We evaluated the size, shape and echogenicity of the mass. The sonographic features and the findings at color Doppler imaging of 11 follow-up studies were compared with those of the initial examinations. Most of the masses were identified at about 3 weeks of age. The mean size of the masses was30x10x15mm. Most of the masses were round (n=13,54%) or fusiform (n=8,33%) in shape. The chogenicity of the mass was iso- (n=15,63%) or slightly hyperechoic (n=9,37%) to that of the surrounding muscles. All 8 cases examined with color Doppler showed branching pattern of arterial signal within the mass at the initial examination. On the follow-up studies, most of the lesions decreased in size and increased in their echogenicity. There was no color Doppler signal on the follow-up study in 7 out of 8 patients in whom both the initial and the follow-up color Doppler imagings were performed. In conclusion, the sonographic findings of fibromatosis coli were more complicated than those described by previous literatures and color Doppler examination could give more information about this disease especially on follow-up studies. A long term follow-up of larger series is required to know the practical significance of the results of follow-up studies

  16. Clinical Value of Color Doppler Ultrasound in Diagnosis of Lower Extremity Deep Venous Thrombosis%彩色多普勒超声诊断下肢深静脉血栓的临床价值

    Institute of Scientific and Technical Information of China (English)

    段林; 谢军

    2015-01-01

    Objective To study the color Doppler flow imaging (CDFI) Detection of deep venous thrombosis of the application. Methods 46 patients with lower extremity deep venous thrombosis (DVT) in patients using color Doppler ultrasonic diagnostic apparatus of the lower extremity deep venous acute and chronic thrombosis in patients with inspection, observation of its two-dimensional images, color flow characteristics and spectral characteristics. Results 46 patients with vascular lesions in the two-dimensional ultrasound image, color Doppler flow imaging and spectral Doppler area showed a significant specificity and sensitivity. Conclusion Color Doppler ultrasound accurate, sensitive, non-invasive diagnosis of deep venous thrombosis is one ef ective method worthy of clinical application.%目的:探讨彩色多普勒血流显像(CDFI)检测下肢深静脉血栓的应用价值。方法对46例下肢深静脉血栓(DVT)患者,采用彩色多普勒超声诊断仪对下肢深静脉急、慢性血栓患者进行检查,观察其二维图像、彩色血流特点及频谱特征。结果46例患者的病变血管在二维超声图像、彩色多普勒血流显像以及频谱多普勒方面均有显著的特异性和敏感性。结论彩色多普勒超声检查准确、敏感、无创,是诊断下肢深静脉血栓的有效方法之一,值得临床推广应用。

  17. Assessment of Regional Myocardial Displacement via Spectral Tissue Doppler Compared with Color Tissue Tracking

    Directory of Open Access Journals (Sweden)

    Zahra Ojaghi-Haghighi

    2008-12-01

    Full Text Available Background: The recent developments in tissue Doppler imaging (TDI now more than ever permit the quantification of the myocardial function. In the current systems, tissue tracking or displacement curves are generated from color tissue Doppler data through the instantaneous temporal integral of velocity-time curves. Methods: The purpose of the present study was to assess regional myocardial displacement via spectral TDI. Maximum myocardial velocities were extracted from spectral pulsed tissue Doppler images using a developed computer program and were integrated throughout the cardiac cycle. Spectral tissue Doppler echocardiography was performed to evaluate longitudinal and radial functions in 20 healthy men, and the calculated end-systolic displacements were subsequently compared with the displacements measured from the same areas via color tissue tracking. Results: According to the Bland-Altman analysis between spectral tissue tracking and color tissue tracking, the significant arithmetic mean was 7.34 mm with SD mean differences of ±2.24 mm in all of the evaluated segments. Despite significant differences (p<0.001, there was a good significant correlation between the two methods (r=0.79, p<0.001. Conclusion: A verification study showed that the proposed approach had the ability to assess regional myocardial displacement using spectral TDI, which can be used in a wider range of equipment than is currently possible.

  18. TORSION TESTIS : ROLE OF COLOR DOPPLER : A STUDY OF 50 CASES

    Directory of Open Access Journals (Sweden)

    Anand

    2015-09-01

    Full Text Available BACKGROUND: T orsion testis is one of the catast r ophic conditions in children and young a d u lts. Traditionally the diagnosis was made clinical presentation and suspicion. Critical decision making is essential to save the testis . OBJECTIVE: To study the usefu lness and efficacy of Doppler ultrasound in correctly diagnosing acute scrotal conditions in children and young adults to save the testis and to avoid negative explorations. METHODS: Over a period of two years 50 patients with acute scrotum were admitted i n general surgery department who underwent Doppler ultrasound scrotum and its efficacy in correctly diagnosing the pathology was analysed. RESULTS: 50 patients with age group <25 years were included in study. Scrotal pain was the most frequent presenting s ymptom of acute scrotum (98% followed by Swelling of the hemiscrolum on the involved side present in 86% of the patients. Doppler ultrasound showed torsion of testis in 18 patients. On Scrotal exploration, torsion of spermatic cord was confirmed in 16 pat ients, one patient had torsion of appendix of testis and the other had Epididymo - orchitis. Thus the sensitivity and specificity of Doppler ultrasonography for testicular torsion was 86.9% and 92.6% respectively. 2 patients with equivocal Doppler findings, but strong clinical suspicion of testicular torsion were explored, and testis was found to be torsed in both two patients. Doppler ultrasonography showed Epididymo - orchitis in 22 patients, torsion of testicular appendage in 2 patients, Idiopathic scrotal edema in one, and in 5 pts no significant pathology found. All twenty patients of epididymo - orchitis, two patients of torsion of testicular appendage, and one patient of idiopathic scrotal edema were managed conservatively. At three weeks follow up, all th e patients were free of symptoms. The sensitivity and specificity of Doppler ultrasonography for epididymo - orchitis was 95% and 100% respectively. CONCLUSIONS: color

  19. Ophthalmic artery color Doppler ultrasonography in mild-to-moderate preeclampsia

    Energy Technology Data Exchange (ETDEWEB)

    Ayaz, Tunahan; Akansel, Gur. E-mail: gakansel@superonline.com; Hayirlioglu, Alper; Arslan, Arzu; Suer, Necdet; Kuru, Ihsan

    2003-06-01

    Objective: To evaluate the hemodynamic changes in mild-moderate preeclampsia using ophthalmic artery Doppler ultrasonography technique. Methods: Ophthalmic artery pulsatility and resistivity indices were calculated in 30 mild-moderate preeclamptic women and 30 normotensive gravid women of matched gestational age. Student's t-test was performed to test the significance of difference. Results: Both indices of peripheral resistance were found to be significantly lower in the ophthalmic arteries of mild-moderately preeclamptic women than those measured in normotensive gravid women at similar stage of pregnancy. In a small number patients whose disease progressed to severe preeclampsia, both indices increased. Conclusion: In patients with mild-moderate preeclampsia, ophthalmic artery color Doppler ultrasonography detects hemodynamic changes that are not present in normotensive gravid women. Reversal of Doppler patterns in a small number of patients with progressive disease supports the hypotheses suggesting the presence of early vasodilation and late vasospasm in the etiology of preeclampsia.

  20. Pulsed and Color Doppler Sonographic Findings of Penile Mondor' Disease

    Energy Technology Data Exchange (ETDEWEB)

    Han, Hye Yeon; Chung, Dong Jin; Kim, Kum Won; Hwang, Cheol Mog [University of Konyang School of Medicine, Daejeon (Korea, Republic of)

    2008-04-15

    Penile Mondor's disease is a rare disease that's characterized by thrombosis in the dorsal vein of the penis. Doppler ultrasonography (US) clearly visualizes dorsal vein thrombosis and the associated hemodynamic alterations. Previous studies have demonstrated the typical color Doppler US findings of superficial dorsal vein thrombosis without the flow signals in this area, yet this is insufficient to understand the hemodynamics in penile Mondor's disease. We report here for the first time a cavernosal artery flow signal pattern in a penile Mondor's disease patient, in addition to its previously reported classic US findings. In conclusion, the Doppler US findings of thrombus without blood flow in the superficial dorsal vein and the low-flow, high resistance in the cavernosal artery may be suggestive of penile Mondor's disease.

  1. Comparison of foetomaternal circulation in normal pregnancies and pregnancy induced hypertension using color Doppler studies.

    Science.gov (United States)

    Gupta, Shikha; Misra, R; Ghosh, U K; Gupta, V; Srivastava, D

    2014-01-01

    The aim of present study was to assess fetomaternal blood flows in normal and abnormal pregnancies using color Doppler indices. Subjects were divided into two groups as: Group A of 25 subjects of normal pregnancy as controls and group B of 25 subjects of pregnancy induced hypertension. All the subjects were lying in the age-group of 25-35 years and having 28 to 34 weeks of gestation; the patients were evaluated by detailed history and were subjected to complete general examination. Blood pressure was taken on two occasions at least 6 hours apart. Systemic examination and obstetrical examination was done in all subjects. All cases were subjected to pathological tests- Haemogram, Test for proteins in urine. Ultrasound assessment of fetal growth was done by measuring BPD (Biparietal diameter), HC (Head circumference), FL (Femur length) and AC (Abdominal circumference): Average gestational age and effective fetal weight was then calculated by ultrasound machine. Color Doppler was used to assess the various Doppler indices indices: Pulsatility index (PI), Resistive index (RI) and Systolic diastolic ratio (S/D ratio) in bilateral uterine, umbilical and middle cerebral arteries and compared to the standard normograms. Percentage of subjects having abnormal Doppler indices were calculated. Assessment of percentage of SGA (small for gestational age) fetuses was done in all the three groups. Decline in mean values of all Doppler indices was found with advancing gestational age in normal pregnancy suggesting decreased vascular resistance and increased blood flow in fetomaternal circulation. In pregnancy induced hypertensives, the mean values of Doppler indices showed a decline as in normal pregnancy but showed an increase (more than 2 S.D. of the mean) for that gestational age in comparison to the control group suggesting increased impedance to blood flow in uteroplacental and fetomaternal circulation. Umbilical artery Doppler indices were found to be the most sensitive

  2. Image analysis of placental issues using three-dimensional ultrasound and color power doppler

    Science.gov (United States)

    Wang, Qi; Cheng, Qiong; Liu, J. G.

    2007-12-01

    With the development of birthing-process medical science, and insurance requirement of prepotency, the ultrasound technique is widely used in the application of obstetrics realm, especially on the monitoring of embryo's growth. In the recent decade, the introduction of high resolution three-dimensional ultrasonic and color power Doppler scanner provides a much more direct, sensitive, forerunner method for the monitoring of embryo and gravida's prediction. A novel method that depends on examining images of vasculature of placenta to determine the growth of embryo is introduced in this paper. First, get a set of placenta vascularity images of the pregnant woman, taken by Color Doppler Ultrasonic Scanner, then mark some points in these images, where we get a section image, thus we can observe the internal blood vessel distribution at those points. This method provides an efficient tool for doctors.

  3. Color doppler ultrasonography: Its role in detection and treatment outcome in infravesical obstruction

    Directory of Open Access Journals (Sweden)

    Saleem Wani

    2003-01-01

    Full Text Available Bladder weight and detrusor blood perfusion increases significantly with infravesical obstruction (IVO and re-lease of obstruction results in reduction of bladder weight and detrusor blood flow. 38 patients with IVO were sub-jected to color Doppler ultrasonography (CD U to detect the blood flow in the hypertrophied detrusor muscle. Blood flow was detected in 84.5% (Fisher exact probability < 0.001. After surgical relief of obstruction, blood flow remained positive in 21.05% patients at 3 months and 13.10% patients at 6 months, which was because of per-sistence of IVO. Color Doppler ultrasonography (CDU is a simple and non-invasive tool which can help in diag-nosis and follow-up of infravesical obstruction.

  4. The value of high-frequency and color Doppler ultrasonography in diagnosing congenital muscular torticollis

    Directory of Open Access Journals (Sweden)

    Wang Lei

    2012-10-01

    Full Text Available Abstract Background Congenital muscular torticollis (CMT is a relatively common neck deformity in infancy. The aim of our research was to determine the value of high-frequency and color Doppler ultrasonography in diagnosing CMT. Methods Patients with a clinical suspicion of CMT underwent an ultrasound examination before diagnosis, and the sonographic characteristics were analyzed and compared with the clinical findings. Results The sensitivity and specificity of an ultrasound diagnosis for CMT was 95.83% and 83.33%, respectively. The patients were divided into 2 groups based on the stage of the disease: the early-stage group (age Conclusions Different stage of CMT patients had different sonographic characteristics. High-frequency and color Doppler ultrasonography can serve as adjunct confirmation tool for the diagnosis of CMT.

  5. Magnetic resonance imaging in the evaluation of placental adhesive disorders: correlation with color Doppler ultrasound

    Energy Technology Data Exchange (ETDEWEB)

    Masselli, Gabriele; Casciani, Emanuele; Polettini, Elisabetta; Gualdi, Gianfranco [Umberto I Hospital-La Sapienza University, Department of Radiology DEA, Rome (Italy); Brunelli, Roberto; Piccioni, Maria G.; Anceschi, Maurizio [Umberto I Hospital-La Sapienza University, Department of Gynecology and Obstetrics, Rome (Italy)

    2008-06-15

    The purpose of this study was to compare the value of pelvic ultrasound with color Doppler and magnetic resonance imaging (MRI) in: (1) the diagnosis of placental adhesive disorders (PADs), (2) the definition of the degree of placenta invasiveness, (3) determining the topographic correlation between the diagnostic images and the surgical results. Fifty patients in the third trimester of pregnancy with a diagnosis of placenta previa and at least one previous caesarean section underwent color Doppler ultrasound (US) and MRI. The sonographic and MRI diagnoses were compared with the final pathologic or operative findings. Outcomes at delivery were as follows: normal placenta (n = 38) and PAD (n = 12). MR and US Doppler showed no statistically difference in identiyfing patients with PAD (P = 0.74), while MRI was statistically better than US Doppler in evaluating the depth of placenta infiltration (P < 0.001). MRI accurately characterized the topography of invasion in 12/12 (100%) of the cases, while US accurately characterized the topography of invasion in 9/12 (75%) of the cases. In conclusion, we confirmed that pelvic US is highly reliable to diagnose or exclude the presence of PAD and found MRI to be an excellent tool for the staging and topographic evaluation of PAD. (orig.)

  6. Clinical significance of color Doppler ultrasound in detection of hepatic cirrhosis and splenic venous hemodynamics

    Institute of Scientific and Technical Information of China (English)

    Jian-Xia Liu

    2016-01-01

    Objective:To investigate the clinical significance of color Doppler ultrasound in the diagnosis of liver cirrhosis patients with portal and splenic venous hemodynamics.Methods:Select from August 2014 to August 2015 60 cases of liver cirrhosis in our hospital were liver cirrhosis, according to the standard of grading of liver function in Child-Pauh points A, B, C grade and healthy people as healthy group comparative study, the use of color Doppler ultrasound in portal vein diameter (DPV), blood flow velocity (VPV), blood flow (QPV) and splenic vein (DSV), blood flow velocity (VSV), blood flow (QSV) were measured, and calculated DSV/DPV.Results:DPV, DSV, QPV, QSV in liver cirrhosis group were significantly higher than those in the healthy group, VSV and VPV were significantly lower than those in the healthy group (P0.05).Conclusions: Color Doppler ultrasound in portal vein hemodynamics detection has is a simple, noninvasive, repeated operation and other advantages, has an important significance in the evaluation of liver function in patients with liver cirrhosis.

  7. Diagnostic agreement between panoramic radiographs and color doppler images of carotid atheroma

    Directory of Open Access Journals (Sweden)

    Claudia Maria Romano-Sousa

    2009-02-01

    Full Text Available The aim of this study was to investigate the agreement between diagnoses of calcified atheroma seen on panoramic radiographs and color Doppler images. Our interest stems from the fact that panoramic images can show the presence of atheroma regardless of the level of obstruction detected by color Doppler images. Panoramic and color Doppler images of 16 patients obtained from the archives of the Health Department of the city of Valença, RJ, Brazil, were analyzed in this study. Both sides of each patient were observed on the images, with a total of 32 analyzed cervical regions. The level of agreement between diagnoses was analyzed using the Kappa statistics. There was a high level of agreement, with a Kappa value of 0.78. In conclusion, panoramic radiographs can help detecting calcifications in the cervical region of patients susceptible to vascular diseases predisposing to myocardial infarction and cerebrovascular accidents. If properly trained and informed, dentists can refer their patients to a physician for a cardiovascular evaluation in order to receive proper and timely medical treatment.

  8. Diagnostic efficacy of color Doppler ultrasound in evaluation of cervical lymphadenopathy.

    Science.gov (United States)

    Misra, Deepankar; Panjwani, Sapna; Rai, Shalu; Misra, Akansha; Prabhat, Mukul; Gupta, Prashant; Talukder, Subrata K

    2016-01-01

    To evaluate the efficacy of color Doppler ultrasound (CDUS) in differentiating benign and malignant cervical lymph nodes by detecting differences in blood flow patterns. In this cross-sectional prospective study, 25 untreated patients with clinical evidence of cervical lymphadenopathy were evaluated. CDUS was performed for 80 cervical lymph nodes. The gray scale parameters of the lymph node and intranodal perfusion sites were the key CDUS features used to differentiate between reactive and metastatic lymph nodes. Histopathological confirmations were obtained and compared with the results of CDUS. Initially, 53 cervical lymph nodes were evaluated by clinical examination. Twenty-seven additional lymph nodes (53 + 27 = 80) were discovered by CDUS evaluation. Gray scale parameters for lymph nodes such as size of lymph node, shape of lymph node, and presence or absence of hilum revealed highly significant results (P < 0.0001). Color Doppler flow signals revealed that central/hilar flow was characteristic for benign nodes whereas peripheral/mixed flow was characteristic for malignant nodes, the findings were highly significant (P < 0.0001). Gray scale and color Doppler features are used to differentiate benign and malignant nodes. Within the limitations of this study, CDUS evaluation was found to be highly significant with a high sensitivity and specificity over clinical evaluation CDUS examination provides a prospect to reduce the need for biopsy/fine needle aspiration cytology in reactive nodes.

  9. Noninvasive color Doppler sonography of uterine blood flow throughout pregnancy in sheep and goats.

    Science.gov (United States)

    Elmetwally, M; Rohn, K; Meinecke-Tillmann, S

    2016-04-01

    In contrast to cattle or horses, uterine blood flow in small ruminants has been investigated predominantly after surgical intervention and chronic instrumentation. The objective of the present study was to investigate the clinical applicability of noninvasive color Doppler sonography to characterize blood flow in the maternal uterine artery of sheep, n = 11 (18 pregnancies) and goats, n = 11 (20 pregnancies). The following parameters were measured transrectally or transabdominally: blood flow volume, time-averaged maximum velocity (TAMV), resistance index (RI), pulsatility index (PI), Time-averaged mean velocity, impedance of blood flow (AB or systolic/diastolic [S/D] velocity ratio), peak velocity of blood flow and blood flow acceleration. Examinations started 2 weeks after breeding and continued at 2-week intervals until parturition. Outcomes for sheep and goats were similar and will be discussed together. Based on noninvasive color Doppler sonography, blood flow volume increased (approximately 60-fold, P sheep and goats. Furthermore, for uterine artery blood flow, there was an effect of stage of pregnancy on PI and RI (P sheep and goats, respectively, and then decreased until parturition. Similar to PI and RI, vascular impedance of the uterine decreased (P < 0.0001) throughout pregnancy. This is apparently the first study using noninvasive color Doppler sonography of uterine blood flow throughout physiological pregnancy in small ruminants. Clearly, this technology facilitates repeated, noninvasive assessments, with great potential for future studies.

  10. Planning digital artery perforators using color Doppler ultrasonography: A preliminary report.

    Science.gov (United States)

    Shintani, Kosuke; Takamatsu, Kiyohito; Uemura, Takuya; Onode, Ema; Okada, Mitsuhiro; Kazuki, Kenichi; Nakamura, Hiroaki

    2016-05-01

    Digital artery perforator (DAP) flaps have been applied for the coverage of finger soft tissue defects. Although an advantage of this method is that there is no scarification of the digital arteries, it is difficult to identify the location of the perforators during intraoperative elevation of the DAP flap. In this study, anatomically reliable locations of DAPs were confirmed using color Doppler ultrasonography (US) in healthy volunteers. A successful case using an adiposal-only DAP flap for the coverage of a released digital nerve using preoperative DAP mapping with color Doppler US is also described. A total of 40 digital arteries in 20 fingers of the right hands of five healthy volunteers (mean age: 32.2 years old) were evaluated. The DAPs were identified using color flow imaging based on the beat of the digital artery in the short axial view. In total, 133 perforators were detected, 76 (an average of 3.8 per finger) arising from the radial digital artery and 57 (an average of 2.9 per finger) arising from ulnar digital artery. Sixty-three perforators (an average of 3.2 per finger) in the middle phalanges and 70 (an average of 3.5 per finger) in the proximal phalanges were found. Overall, an average of 1.7 perforators from each digital artery was detected in the proximal or middle phalanges. Moreover, at least one DAP per phalanx was reliably confirmed using color Doppler US. Preoperative knowledge of DAP mapping could make elevating the DAP flap easier and safer.

  11. Color Doppler quantitative measures to predict outcome of biopsies in prostate cancer

    Energy Technology Data Exchange (ETDEWEB)

    Strigari, Lidia; Marsella, Annelisa; Canitano, Stefano; Gomellini, Sara; Arcangeli, Stefano; Genovese, Elisabetta; Saracino, Biancamaria; Petrongari, Maria Grazia; Sentinelli, Steno; Crecco, Marcello; Benassi, Marcello; Arcangeli, Giorgio [Laboratory of Medical Physics and Expert Systems, Regina Elena National Cancer Institute, Rome 00144 (Italy); Radiology Department, Regina Elena National Cancer Institute, Rome 00144 (Italy); Radiotherapy Department, Regina Elena National Cancer Institute, Rome 00144 (Italy); Laboratory of Medical Physics and Expert Systems, Regina Elena National Cancer Center, Rome 00144 (Italy); Radiotherapy Department, Regina Elena National Cancer Center, Rome 00144 (Italy); Pathology Department, Regina Elena National Cancer Center, Rome 00144 (Italy); Radiology Department, Regina Elena National Cancer Center, Rome 00144 (Italy); Laboratory of Medical Physics and Expert Systems, Regina Elena National Cancer Institute, Rome 00144 (Italy); Radiotherapy Department, Regina Elena National Cancer Institute, Rome 00144 (Italy)

    2008-11-15

    Purpose: The aim was to correlate the color Doppler flow activity pre- and postradiotherapy, using transrectal color Doppler ultrasonography (CDUS) and the 2 year positive biopsy rate after radiotherapy in patients with prostate cancer. Methods and materials: Analysis was carried out in 69 out of 160 patients who had undergone treatment with 3D-conformal radiotherapy (3D-CRT) to prostate and seminal vesicles. Patients were randomized to receive 80 Gy in 40 fractions in 8 weeks (arm A) and 62 Gy in 20 fractions in 5 weeks, 4 fractions per week (arm B). Color Doppler flow activity (CDFA) was evaluated calculating the vascularization index (VI), defined as the ratio between the colored and total pixels in the whole and peripheral prostate, delineated by a radiation oncologist on CDUS images, using EcoVasc a home-made software. The difference between the 2 year post- and pre-3D-CRT maximum VI (VI{sub max}), named {Delta}VI{sub max}, was calculated in the whole and peripheral prostate for each patient. Then, {Delta}VI{sub max} and the detected 2 year biopsy outcome were analyzed using the receiver operating characteristics (ROC) technique. Results: The VI{sub max} increased or decreased in patients with positive or negative biopsies, respectively, compared to the value before RT in both arms. The area under the ROC curve for {Delta}VI{sub max} in the whole and peripheral prostate is equal to 0.790 and 0.884, respectively. Conclusion: The {Delta}VI{sub max} index, comparing CDFA at 2 years compared to that before RT, allows the 2 year postradiotherapy positive biopsy rate to be predicted.

  12. Gray-scale and color doppler US features corresponding to histological subtypes of papillary thyroid carcinoma

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Sang Kwon; Kwon, Sun Young; Woo, Seong Ku [Dongsan Medical Center, Keimyung University College of Medicine, Daegu (Korea, Republic of)

    2007-01-15

    To compare the gray-scale and color or power Doppler ultrasonographic (US) features according to the histological subtypes of a papillary thyroid carcinoma (PTC). The gray-scale and color or power Doppler US features of 159 surgically confirmed PTC (classic type of PTC, 69; classic type of papillary microcarcinoma [PMC], 67; and follicular variant of PTC [FVPTC], 23) in 118 patients were analyzed retrospectively. The following US characteristics were evaluated: the type of vascularization, echogenicity, outline, ratio of anteroposterior/transverse (AP/T) diameters, as well as the presence or absence of halo sings, cystic changes, and microcalcification. The most common type of vascularization was penetrating or central (75.4%) for the classic type of PTC, avascular (56.7%) for PMC, and peripheral and central (82.6%) for FVPTC. The echogenicity was most commonly hypoechoic (47.8%) for the classic type, hypoechoic (74.6%) for PMC, and isoechoic (30.4%) for FVPTC. The outline was most often irregular (60.9%) for the classic type, irregular (86.6%) for PMC, and regular (91.3%) for FVPTC. The ratio of the AP/T diameters was 1.0 or more in 31.9%, 55.2%, and 13.0%, a halo sign was observed in 30.4%, 6.0%, and 78.3%, cystic changes was present in 1.4%, 0%, and 21.7%, and microcalcifications were present in 55.1%, 28.4%, and 13.0% of those with the classic type, PMC and FVPTC, respectively. The gray-scale and color Doppler US features corresponding to the histological subtypes of PTC are significantly different from one another. The US features of FVPTC appear to be significantly different from the other subtypes in that they tend to have more benign US characteristics than those of the classic type or PMC.

  13. Renal venous thrombosis in an infant with predisposing thrombotic factors: color Doppler ultrasound and MR evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Argyropoulou, Maria I.; Papadopoulou, Frederica; Nikolopoulos, Pangiotis [Department of Radiology, Medical School, University of Ioannina, 45110, Ioannina (Greece); Giapros, Vassilios I.; Drougia, Aikaterini A.; Andronikou, Styliani [Neonatology Clinic, Medical School, University of Ioannina, 45110, Ioannina (Greece); Vartholomatos, Georgios A. [Department of Haematology, Medical School, University of Ioannina, 45110, Ioannina (Greece)

    2003-08-01

    We report a case of a neonate with hereditary thrombophilia presenting with renal venous thrombosis (RVT). Early color Doppler findings of RVT were lacking venous flow, and the arterial diastolic flow was reversed. This very high-resistance arterial flow is for the first time described in neonatal RVT. Magnetic resonance imaging showed low signal intensity of the renal pyramids on T1- and T2-weighted images, suggesting acute hemorrhage. After intravenous contrast injection, persistent cortical enhancement was observed along with lack of medullary enhancement. Despite the progressive reestablishment of some venous drainage, the kidney showed atrophy and loss of function. (orig.)

  14. MR angiography versus color Doppler sonography in the evaluation of renal vessels and the inferior vena cava in abdominal masses of pediatric patients.

    Science.gov (United States)

    Pfluger, T; Czekalla, R; Hundt, C; Schubert, M; Graubner, U; Leinsinger, G; Scheck, R; Hahn, K

    1999-07-01

    Involvement of renal vessels and the inferior vena cava (IVC) plays a decisive role during operative planning for removal of abdominal masses in pediatric patients. Advantages and limitations of MR angiography and color Doppler sonography for determining these factors were evaluated. MR angiography and color Doppler sonography were performed preoperatively in 42 neonates, infants, and children with abdominal masses and were compared with spin-echo MR imaging and with surgical findings. Variables evaluated were anatomic variants, vessel displacement, patency of vessels, collateral circulation, and intravascular tumor extension. Quality of vessel visualization was assessed in vessels not affected by tumor. In 88% of unaffected renal vessels, the entire vessel course could be visualized on MR angiography compared with 58% on color Doppler sonography and 43% on spin-echo MR imaging. In four of nine cases, color Doppler sonography revealed an accessory renal artery, whereas MR angiography revealed these variants in seven of nine cases. MR angiography showed 79% and color Doppler sonography 66% of displaced vessels. Unlike MR angiography, color Doppler sonography did not reveal five stenotic renal veins because they could not be completely imaged. In two cases, however, MR angiography falsely indicated an occlusion of the IVC, whereas color Doppler sonography showed residual flow. Anatomic variants, vessel displacement, collateral circulation, and neoplastic vessel infiltration were revealed more accurately by MR angiography than by color Doppler sonography. In cases in which patency of the IVC is unclear on MR angiography, color Doppler sonography should also be performed.

  15. Enhanced sensitivity in H photofragment detection by two-color reduced-Doppler ion imaging

    Energy Technology Data Exchange (ETDEWEB)

    Epshtein, Michael; Portnov, Alexander; Kupfer, Rotem; Rosenwaks, Salman; Bar, Ilana, E-mail: ibar@bgu.ac.il [Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel)

    2013-11-14

    Two-color reduced-Doppler (TCRD) and one-color velocity map imaging (VMI) were used for probing H atom photofragments resulting from the ∼243.1 nm photodissociation of pyrrole. The velocity components of the H photofragments were probed by employing two counterpropagating beams at close and fixed wavelengths of 243.15 and 243.12 nm in TCRD and a single beam at ∼243.1 nm, scanned across the Doppler profile in VMI. The TCRD imaging enabled probing of the entire velocity distribution in a single pulse, resulting in enhanced ionization efficiency, as well as improved sensitivity and signal-to-noise ratio. These advantages were utilized for studying the pyrrole photodissociation at ∼243.1 and 225 nm, where the latter wavelength provided only a slight increase in the H yield over the self-signal from the probe beams. The TCRD imaging enabled obtaining high quality H{sup +} images, even for the low H photofragment yields formed in the 225 nm photolysis process, and allowed determining the velocity distributions and anisotropy parameters and getting insight into pyrrole photodissociation.

  16. [Echotomography and color-Doppler in the diagnosis of thyroid carcinoma].

    Science.gov (United States)

    Messina, G; Viceconti, N; Trinti, B

    1996-01-01

    Ultrasound examination of the thyroid gland is used extensively in the diagnosis of thyroid carcinoma: it is easy and rapid to perform and widely available. Ultrasound enables easy identification of the image of disease foci within the gland, especially when high frequency probes (7.5-10 MHz) are used. Thyroid nodules are subdivided on the basis of their echostructure into hypoechoic solid, isoechoic solid, and hyperechoic solid, mixed, and liquid. In neoplastic pathologies, a hypoechoic echostructure is not pathognomonic of malignancy but must be regarded with suspicion, especially if it is an isolated nodule in a male patient and continues to grow during suppressive therapy. In fact, thyroid neoplasms evidence a hypoechoic echostructure in 60-70% of the cases, while a hyperechoic echostructure is present in only 2-4%. Only 15-25% of neoplasms appear as isoechoic nodules; a mixed echostructure is rarely (5-10% of the cases) seen. Color-Doppler patterns are classified into four types: I) nodules without internal or perinodular vascularization; II) nodules with vascularization confined to extranodular tissue; III) nodules with significant intra- and perinodular vascularization; IV) increased vascularization (or "thyroid inferno"). The vast majority of thyroid carcinoma (90%) presents type III vascularization. We therefore suggest the routine use of ultrasonography and color-Doppler studies in conjunction with fine-needle aspiration cytology for the diagnostic evaluation of thyroid carcinoma.

  17. New adaptive clutter rejection for ultrasound color Doppler imaging: in vivo study.

    Science.gov (United States)

    Yoo, Yang Mo; Kim, Yongmin

    2010-03-01

    Clutter rejection is essential for accurate flow estimation in ultrasound color Doppler imaging. In this article, we present a new adaptive clutter rejection (ACR) technique where an optimum filter is dynamically selected depending upon the underlying clutter characteristics (e.g., tissue acceleration and power). We compared the performance of the ACR method with other adaptive methods, i.e., down-mixing (DM) and adaptive clutter filtering (ACF), using in vivo data acquired from the kidney, liver and common carotid artery. With the kidney data, the ACR method provided an average improvement of 3.05 dB and 1.7 dB in flow signal-to-clutter ratio (SCR) compared with DM and ACF, respectively. With the liver data, SCR was improved by 2.75 dB and 1.8 dB over DM and ACF while no significant improvement with ACR was found in the common carotid artery data. Thus, the proposed adaptive method could provide more accurate flow estimation by improving clutter rejection in abdominal ultrasound color Doppler imaging pending validation.

  18. The Study of Ovarian Artery Hemodynamics in Patients with Infertility by Color Doppler Energy

    Institute of Scientific and Technical Information of China (English)

    肖先桃; 乐桂蓉; 张友耿; 黎春蕾

    2001-01-01

    Seventy-four cases of infertility were examined to study the hemodynamics of the bilateral ovarian arteries at 21st day during the corpus luteum phase by color Doppler energy(CDE) and color Doppler flow imaging (CDFI). All the patients were verified by laparoscopy, fallopian tube patency examination and ovarian function test. Twenty-two healthy women served as controls. The results showed that the difference of resistance index(RI)and pulsatility index (PI) of bilateral ovarian arteries between the infertility and the normal controls had statistical significance (P<0.01), and the PI showed negative correlation with the thickness of endometrium (left side: r=0.724, P<0.01; right side: r=0.756, P<0.01). The results also showed that CDE was more sensitive than CDFI in displaying the ovarian arteries. It could be concluded that the elevated resistance of ovarian artery during the corpus luteum phase was one of the important factors that resulted in infertility.

  19. Sonography and Color Doppler in the Evalua-tion of Cold Thyroid Nodules

    Directory of Open Access Journals (Sweden)

    M. A. Shabani Samghabadi

    2004-06-01

    Full Text Available Background/Objective: Thyroid nodules are a common finding, especially in our country. In this study, we evaluated the role of conventional ultrasonography (US and color doppler sonography (CDS in assessment of cold thyroid nodules. Materials and Methods: Ninety-seven patients with a cold thyroid nodule were examined by US and CDS before thyroidectomy .On US, the presence of a halo sign, hypoechogenicity or microcalcification was evaluated .The vascular pattern on CDS was classified as follows: Type 1, absence of blood flow; Type 2, perinodular blood flow; Type 3, intranodular blood flow. Sensitivity, specificity, negative predictive value, positive predictive value and accuracy of ultrasound and color doppler findings were evaluated. Ultrasound findings have been compared with postoperative pathological result. Results: In 38 patients, thyroidal carcinoma was found. Absence of halo sign, presence of microcalcification and hypoechogenicity were predictive of malignancy (P < 0.001. Presence of intranodular hyper-vascularity and perinodular hypervascularity were in favor of malignancy (P < 0.001 and benignity (P < 0.01, respectively. An avascular pattern could not differentiate between benign and malignant nodules. Conclusion: US and CDS findings can predict malignant nodules, especially when multiple signs are simultaneously present.

  20. Vascular waveform analysis of flap-feeding vessels using color Doppler ultrasonography.

    Science.gov (United States)

    Ogino, Akihiro; Onishi, Kiyoshi

    2014-01-01

    We performed vascular waveform analysis of flap-feeding vessels using color Doppler ultrasonography and evaluated the blood flow in the flaps prior to surgery. Vascular waveform analysis was performed in 19 patients. The analyzed parameters included the vascular diameter, flow volume, flow velocity, resistance index, pulsatility index, and acceleration time. The arterial waveform was classified into 5 types based on the partially modified blood flow waveform classification reported by Hirai et al.; in particular, D-1a, D-1b, and D-2 were considered as normal waveforms. They were 4 patients which observed abnormal vascular waveform among 19 patients (D-4 : 1, D-3 : 1, and Poor detect : 2). The case which presented D-4 waveform changed the surgical procedure, and a favorable outcome was achieved. Muscle flap of the case which presented D-3 waveform was partially necrosed. The case which detected blood flow poorly was judged to be the vascular obstruction of the internal thoracic artery. In the evaluation of blood flow in flaps using color Doppler ultrasonography, determination of not only basic blood flow information, such as the vascular distribution and diameter and flow velocity, but also the flow volume, vascular resistance, and arterial waveform is essential to elucidate the hemodynamics of the flap.

  1. Evaluation of patients with thyrotoxic autoimmune thyroiditis by color flow doppler ultrasonography

    Directory of Open Access Journals (Sweden)

    Ömer Karakaş

    2013-03-01

    Full Text Available Objective: In this study, we aimed to examine the availabilityand the effects of differential diagnosis of thyroidgland morphological changes and blood flow patterns inpatients with thyrotoxic phase Graves’ disease (BGDand Hashimoto’s thyroiditis (HT by color flow doppler ultrasonography(CDUS.Methods: This cross-sectional study was included 24consecutive patients with thyrotoxicosis and 18 healthycontrols. There were Basedow-Graves’ disease in 17 andHashimoto thyroiditis in 7 of previously untreated 24 patients.Morphological information of thyroid gland was obtainedby B-mode ultrasonography in all cases. Blood flowpattern of the thyroid gland was determined by CDUS.Results: The thyroid volumes and FT3, TRAb, 4-h and24-h RAIU levels of the patients with Graves’s diseasewere significantly higher than the patients with HT.Whereas thyroid gland echogenicity was decreased in 14of BGH cases, it was diminished in 2 patients with HT.Significant difference was found between BGD and HTgroups in terms of thyroid gland echogenicity. In all patientswith BGD and HT, echopattern was heterogenous.In all patients, blood flow patterns of thyroid gland wereobtained by CDUS. Color flow doppler ultrasonographyand pattern 3 blood flows were only observed in BGD.Significant difference was found between HT and BGDgroups in blood flow pattern.Conclusion: Heterojen echopattern, decreased echogenicity,volume changes and type 3 blood flow patternof thyroid gland obtained using B-mode Ultrasound andCDUS may be useful in the determination and differentiationof thyrotoxic BGD and HT diseases. J Clin Exp Invest2013; 4 (1: 73-79Key words: Doppler ultrasonography, autoimmune thyroiditis,thyrotoxicosis

  2. Gender-related asymmetric brain vasomotor response to color stimulation: a functional transcranial Doppler spectroscopy study

    Directory of Open Access Journals (Sweden)

    Njemanze Philip C

    2010-11-01

    Full Text Available Abstract Background and Purpose The present study was designed to examine the effects of color stimulation on cerebral blood mean flow velocity (MFV in men and women. Methods The study included 16 (8 men and 8 women right-handed healthy subjects. The MFV was recorded simultaneously in both right and left middle cerebral arteries in Dark and white Light conditions, and during color (Blue, Yellow and Red stimulations, and was analyzed using functional transcranial Doppler spectroscopy (fTCDS technique. Results Color processing occurred within cortico-subcortical circuits. In men, wavelength-differencing of Yellow/Blue pairs occurred within the right hemisphere by processes of cortical long-term depression (CLTD and subcortical long-term potentiation (SLTP. Conversely, in women, frequency-differencing of Blue/Yellow pairs occurred within the left hemisphere by processes of cortical long-term potentiation (CLTP and subcortical long-term depression (SLTD. In both genders, there was luminance effect in the left hemisphere, while in men it was along an axis opposite (orthogonal to that of chromatic effect, in women, it was parallel. Conclusion Gender-related differences in color processing demonstrated a right hemisphere cognitive style for wavelength-differencing in men, and a left hemisphere cognitive style for frequency-differencing in women. There are potential applications of fTCDS technique, for stroke rehabilitation and monitoring of drug effects.

  3. Two-dimensional calculus

    CERN Document Server

    Osserman, Robert

    2011-01-01

    The basic component of several-variable calculus, two-dimensional calculus is vital to mastery of the broader field. This extensive treatment of the subject offers the advantage of a thorough integration of linear algebra and materials, which aids readers in the development of geometric intuition. An introductory chapter presents background information on vectors in the plane, plane curves, and functions of two variables. Subsequent chapters address differentiation, transformations, and integration. Each chapter concludes with problem sets, and answers to selected exercises appear at the end o

  4. Two dimensional vernier

    Science.gov (United States)

    Juday, Richard D. (Inventor)

    1992-01-01

    A two-dimensional vernier scale is disclosed utilizing a cartesian grid on one plate member with a polar grid on an overlying transparent plate member. The polar grid has multiple concentric circles at a fractional spacing of the spacing of the cartesian grid lines. By locating the center of the polar grid on a location on the cartesian grid, interpolation can be made of both the X and Y fractional relationship to the cartesian grid by noting which circles coincide with a cartesian grid line for the X and Y direction.

  5. Color Doppler measurement of blood flow in the inferior thyroid artery in patients with autoimmune thyroid diseases

    Energy Technology Data Exchange (ETDEWEB)

    Caruso, Giuseppe; Attard, Marco; Caronia, Aurelio; Lagalla, Roberto

    2000-10-01

    Purpose: The aim of the study is to find out whether the measurement of peak systolic velocity in the inferior thyroid artery (ITA) is a valuable parameter to differentiate autoimmune thyroid diseases (hyper-, normo- or hypofunctional) and to evaluate the efficacy of medical treatment. Material and methods: The ITA of 31 patients (eight with Graves' disease, 23 with subclinical hypothyroidism) was examined with color Doppler and pulsed Doppler. The final diagnosis was obtained by citology and by hormonal and antibodies assays. The patients were monitorized by ultrasound for a period of 8 months. Results: In all the patients with Graves' disease the peak systolic velocity was always over 150 cm/s, while in other autoimmune thyroiditis the peak systolic velocity was within the normal range, and never exceeding 65 cm/s. In the first group, the measurement taken in the ITA showed also the efficacy of the pharmacological treatment earlier and more reliably than the color Doppler pattern obtained in the parenchyma. Conclusions: The color Doppler measurement of the ITA seems to be a promising technique with low-cost and easy approach. In our experience, the color Doppler of the ITA could have a clinical role in the differential diagnosis of diffuse thyroid diseases and in the follow-up of the Graves' disease during medical treatment.

  6. [Intracranial blood flow velocities evaluated by color Doppler (duplex) in preterm infants].

    Science.gov (United States)

    de Assis, Marcelo Cardoso; Machado, Helio Rubens

    2004-03-01

    In order to ascertain the blood flow velocities in the intracranial arteries we evaluated 73 preterm neonates during a period ranging from June 1994 to March 1999. These preterm infants were divided in two separate groups, 18 healthy and 55 with intracranial hemorrhage. They were subjected to sequential measurements of blood flow velocities in the intracranial arteries. The gestational age of the whole group varied from 28 to 36 weeks and birth weights between 720 and 2530 g. The diagnosis of the intracerebral hemorrhages in these preterm neonates were done using high resolution gray and color scale transfontanellar ultrasonography brain scans. The ultrasound evaluations were performed in the initial 3rd, 7th and 14th day of life. The 73 preterm infants were evaluated with sequential measurements of blood flow velocity in the intracranial arteries using the Doppler technique through the anterior fontanelle. Doppler evaluation of the cerebral vessels were performed on days 3, 7, 30 and 90 of life. These evaluations were performed in the six intracranial arteries, meaning: right and left anterior and middle cerebral arteries and right and left internal carotid arteries. Doppler recordings were made using Duplex Color-Doppler system, pulse echo probe of 3,5; 5,0 and 7,5 MHz. Measuring the blood flow velocity in the cerebral arteries we obtained a maximum systolic velocity and end diastolic velocity with a rate in meters per second (m/s) for each cardiac cycle. After obtaining these numerical values for these velocities we obtained the resistance index (RI) or Pourcelot index. In a progressive way as the resistance index (RI) values were being obtained in each stage of this study they were also being checked in the cerebral arteries of healthy preterm infants and infants with intracranial hemorrhages. We also analyzed in a comparative method the values of the resistive index between the two groups of preterm infants observing their behaviour. The results obtained when

  7. Endoscopic Color Doppler Ultrasonographic Evaluation of Gastric Varices Secondary to Left-Sided Portal Hypertension

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    Takahiro Sato

    2014-06-01

    Full Text Available Gastric varices that arise secondary to the splenic vein occlusion can result in gastrointestinal hemorrhaging. Endoscopic color Doppler ultrasonography (ECDUS was performed in 16 patients with gastric varices secondary to splenic vein occlusion. This study retrospectively evaluated the role of ECDUS in the diagnosis of gastric varices secondary to splenic vein occlusion. Thirteen patients had co-existing pancreatic diseases: 8 with chronic pancreatitis, 4 with cancer of the pancreatic body or tail and 1 with severe acute pancreatitis. Of the remaining 3 patients, 1 had myeloproliferative disease, 1 had advanced gastric cancer, and the third had splenic vein occlusion due to an obscure cause. The endoscopic findings of gastric varices were: variceal form (F classified as enlarged tortuous (F2 in 12 cases and large, coil-shaped (F3 in 4 cases, and positive for erosion or red color sign of the variceal surface in 4 cases and negative in 12 cases. ECDUS color flow images of gastric variceal flow clearly depicted a round fundal region at the center, with varices expanding to the curvatura ventriculi major of the gastric body in all 16 cases. The velocities of F3 type gastric varices were significantly higher than those of the F2 type. The wall thickness of varices positive for erosion or red color sign was significantly less than the negative cases. I conclude that ECDUS color flow images of gastric variceal flow depicted specific findings of gastric varices secondary to splenic vein occlusion at the round fundal region at the center, with varices expanding to the curvatura ventriculi major of the gastric body.

  8. Color Doppler flow imaging diagnosis and treatment selection for erectile dysfunction

    Institute of Scientific and Technical Information of China (English)

    XUAN Xu-jun; ZHANG Cai-xia; HUANG Jian; Rong Lu; SUN Peng; LIU Hai-nan

    2011-01-01

    Background Targeted therapy for erectile dysfunction (ED) involves fewer screening tests and provides a variety of treatment choices for patients.Although the advantage of targeted therapy in diagnosis and therapy for ED has been recognized,the rational mode for oriented ED therapy has not been established.This study aimed to investigate targeted diagnosis and therapy for ED.Methods A total of 198 patients with ED were included in the study.After intracavernosal vasoactive agent injection was given,color Doppler flow imaging was performed and penile rigidity was classified as Schramek grade 5 (10 minutes duration),grade 4 (10 minutes duration),grade 3 and grade 2,defining four patient groups as group Ⅴ (143 cases),group Ⅳ (23 cases),group Ⅲ (18 cases),and group Ⅱ (14 cases).Appropriate and acceptable treatment was recommended to patients according to erection grade.Results In 198 patients with ED,the peak systolic velocity,end diastolic velocity,and resistance index in the cavemosal artery and dorsal artery and the flow velocity in the deep dorsal vein were not significantly different before injection (P >0.05).After injection,peak systolic velocity,end diastolic velocity,and resistance index in the cavernosal artery were different among the four groups (P<0.05).Between each two groups,the difference in resistance index was significant (P <0.05).The statistical differences in other indexes were not significant (P >0.05).Selective targeted therapy based on erection grade by color Doppler flow imaging improved the clinical satisfaction rate to 91.91% (182/198).Conclusions Based on the routine diagnosis of ED,blood flow indexes in the cavernosal artery are measured by color Doppler flow imaging following minimally invasive intercavernosal injection,which is combined with the Schramek grade of erection.The most appropriate and acceptable treatment is recommended according to the different groups,which improves the clinical satisfaction of treatment for

  9. Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography.

    Science.gov (United States)

    Yamakoshi, Yoshiki; Nakajima, Takahito; Kasahara, Toshihiro; Yamazaki, Mayuko; Koda, Ren; Sunaguchi, Naoki

    2017-02-01

    Shear wave elastography is a distinctive method to access the viscoelastic characteristic of the soft tissue that is difficult to obtain by other imaging modalities. This paper proposes a novel shear wave elastography [color Doppler shear wave imaging (CD SWI)] for breast tissue. Continuous shear wave is produced by a small lightweight actuator, which is attached to the tissue surface. Shear wave wavefront that propagates in tissue is reconstructed as a binary pattern that consists of zero and the maximum flow velocities on color flow image (CFI). Neither any modifications of the ultrasound color flow imaging instrument nor a high frame rate ultrasound imaging instrument is required to obtain the shear wave wavefront map. However, two conditions of shear wave displacement amplitude and shear wave frequency are needed to obtain the map. However, these conditions are not severe restrictions in breast imaging. This is because the minimum displacement amplitude is [Formula: see text] for an ultrasonic wave frequency of 12 MHz and the shear wave frequency is available from several frequencies suited for breast imaging. Fourier analysis along time axis suppresses clutter noise in CFI. A directional filter extracts shear wave, which propagates in the forward direction. Several maps, such as shear wave phase, velocity, and propagation maps, are reconstructed by CD SWI. The accuracy of shear wave velocity measurement is evaluated for homogeneous agar gel phantom by comparing with the acoustic radiation force impulse method. The experimental results for breast tissue are shown for a shear wave frequency of 296.6 Hz.

  10. Qualitative analysis of a sulfur-fumigated Chinese herbal medicine by comprehensive two-dimensional gas chromatography and high-resolution time of flight mass spectrometry using colorized fuzzy difference data processing.

    Science.gov (United States)

    Cai, Hao; Cao, Gang; Zhang, Hong-Yan

    2017-04-01

    To investigate the chemical transformation of volatile compounds in sulfur-fumigated Radix Angelicae Sinensis. A comprehensive two-dimensional gas chromatography (GC×GC) and high-resolution time-of-flight mass spectrometry (HR-TOF/MS) with colorized fuzzy difference (CFD) method was used to investigate the effect of sulfur-fumigation on the volatile components from Radix Angelicae Sinensis. Twenty-five compounds that were found in sun-dried samples disappeared in sulfur-fumigated samples. Seventeen volatile components including two sulfur-containing compounds were newly generated for the first time in volatile oils of sulfur-fumigated Radix Angelicae Sinensis. The strategy can be successfully applied to rapidly and holistically discriminate sun-dried and sulfur-fumigated Radix Angelicae Sinensis. GC×GC-HR-TOF/MS based CFD is a powerful and feasible approach for the global quality evaluation of Radix Angelicae Sinensis as well as other herbal medicines.

  11. Accuracy of color Doppler ultrasonography and magnetic resonance imaging in diagnosis of placenta accreta: A survey of 82 cases

    Directory of Open Access Journals (Sweden)

    Sedigheh Ayati

    2017-08-01

    Full Text Available Background: Placenta adhesive disorder (PAD is one of the most common causes of postpartum hemorrhage and peripartum hysterectomy. The main risk factors are placenta previa and prior uterine surgery such as cesarean section. Diagnosis of placenta adhesive disorders can lead to a decrease of maternal mortality and morbidities. Objective: The purpose of this study was to compare the accuracy of color Doppler ultrasonography and magnetic resonance imaging (MRI in the diagnosis of PADs. Materials and Methods: In this is cross-sectional study, Eighty-two pregnant women who were high risk for PAD underwent color Doppler ultrasound and MRI after 18 weeks of gestation. The sonographic and MRI findings were compared with the final pathologic or clinical findings. P<0.05 was considered statistically significant. Results: Mean maternal age was 31.42±4.2 years. The average gravidity was third pregnancy. 46% of patients had placenta previa. The history of the previous cesarean section was seen in 79 cases (96%. The diagnosis of placenta adhesive disorder was found in 17 cases (21%. Doppler sonography sensitivity was 87% and MRI sensitivity was 76% (p=0.37. Doppler sonography specificity was 63% and MRI specificity was 83% (p=0.01. Conclusion: Women with high-risk factors for PAD should undergo Doppler ultrasonography at first. When results on Doppler sonography are equivocal for PAD, MRI can be performed due to its high specificity

  12. PRELIMINARY APPLICATION OF COLOR DOPPLER FLOW IMAGING IN THE LOCALIZATION OF PARATHYROID ADENOMAS

    Institute of Scientific and Technical Information of China (English)

    张缙熙; 李建初

    1994-01-01

    From December 1991 to April 1993,we performed color Doppler flow imaging(CDFI) in 11 patients with parathyroid adenoma,and all cases were confirmed by toperation and pathology.In all the parathyroid adenomas,vessels were clearly revealed at the periphery of the upper pole and /or anterior periphery,where arterial signals were elicited.These arteries had branches into the adenomas and originated from inferior thyroid arteries on the same side in most cases.The internal flow signals were increased markedly as compared to normal thyroid,and high-velocity arterial signals were detected.Because of the thyroid's rich blood supply and landmark peripheral vessels.CDFI can distinguish parathyroid foci from thyroid nodules,lymph nodes,and normal tissues and provide a sound basis for the diagnosis of small parathyroid foci.

  13. CHARACTERISTICS OF TWO-DIMENSIONALAND COLOR DOPPLER ULTRASONOGRAPHY IN GRAVESI DISEASE

    Institute of Scientific and Technical Information of China (English)

    李建初; 张缙熙; 白耀; 程玉芳; 蔡胜; 孙宏宇

    1994-01-01

    Color Doppler flow imaging (CDFI) was performed in 24 patients with Graves′ disease and the resulths were compared with those from 8 patients with Hashimoto′s disease,6 patients with simple diffuse goiter,and 15 nor-mal volunteers.All cases were confirmed by clinical,laboratory tests or pathology.CDFI of Graves′ disease showed diffuse or localized hypoechoes within the thyroid glands,rich flow signals in the hypoechoes,accelerated flow velocity,and decreased resistance in the superior thyroid arteries(STA)and arteries within the glands.These appearances were characteristic as compared with the controls.The rate of flow in STA of Graves′ disease patients was 8 to 10 times higher than that in the normal volunteers.Tthis study demonstrates that CDFI is convenient and efficient as compared with isotope scan and some other laboratory tests,and can be widely used in the diagnosis of Graves′ disase.

  14. Color Doppler Ultrasound Study of Glomuvenous Malformations with its Clinical and Histologic Correlations.

    Science.gov (United States)

    Wortsman, X; Millard, F; Aranibar, L

    2017-07-03

    Glomuvenous malformations are hamartomatous lesions characterized by the presence of glomus cells in the vascular smooth muscle. We present the clinical and color Doppler ultrasound features of a series of 13 cases of histologically confirmed glomuvenous malformations. In all cases, the ultrasound study revealed moderately delimited superficial dermal and hypodermal pseudonodular structures of mixed echogenicity, with hypoechoic and heterogeneous areas and anechoic, pseudocystic tubular and lacunar zones. Arterial and venous vessels, mainly with a low flow (≤ 15cm/s) were observed in 85% of patients, but no arteriovenous shunts were present. Deeper structures were not affected and no phleboliths were detected. The clinical and ultrasound findings could facilitate diagnosis, surgical planning, and noninvasive follow-up in these tumors. Copyright © 2017 AEDV. Publicado por Elsevier España, S.L.U. All rights reserved.

  15. "Focal thyroid inferno" on color Doppler ultrasonography: a specific feature of focal Hashimoto's thyroiditis.

    Science.gov (United States)

    Fu, Xianshui; Guo, Limei; Zhang, Huabin; Ran, Weiqiang; Fu, Peng; Li, Zhiqiang; Chen, Wen; Jiang, Ling; Wang, Jinrui; Jia, Jianwen

    2012-11-01

    To evaluate color-Doppler features predictive of focal Hashimoto's thyroiditis. A total of 521 patients with 561 thyroid nodules that underwent surgeries or gun biopsies were included in this study. These nodules were divided into three groups: focal Hashimoto's thyroiditis (104 nodules in 101 patients), benignity other than focal Hashimoto's thyroiditis (73 nodules in 70 patients), and malignancy (358 nodules in 350 patients). On color Doppler sonography, four vascularity types were determined as: hypovascularity, marked internal flow, marked peripheral flow and focal thyroid inferno. The χ2 test was performed to seek the potential vascularity type with the predictive ability of certain thyroid pathology. Furthermore, the gray-scale features of each nodule were also studied. The vascularity type I (hypovascularity) was more often seen in focal Hashimoto's thyroiditis than other benignity and malignancy (46% vs. 20.5% and 19%). While the type II (marked internal flow) showed the opposite tendency (26.9% [focal Hashimoto's thyroiditis] vs. 45.2% [other benignity] and 52.8% [malignancy]). However, type III (marked peripheral flow) was unable to predict any thyroid pathology. Importantly, type IV (focal thyroid inferno) was exclusive to focal Hashimoto's thyroiditis. All 8 type IV nodules appeared to be solid, hypoechoic, and well-defined. Using "focal thyroid inferno" as an indicator of FHT, the diagnostic sensitivity and specificity were 7.7% and 100% respectively. The vascularity type of "focal thyroid inferno" is specific for focal Hashimoto thyroiditis. Recognition of this particular feature may avoid unnecessary interventional procedures for some solid hypoechoic thyroid nodules suspicious of malignancy. Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.

  16. Color Doppler US of normal cerebral venous sinuses in neonates: a comparison with MR venography

    Energy Technology Data Exchange (ETDEWEB)

    Miller, Elka [Hospital for Sick Children, Department of Diagnostic Imaging, Toronto (Canada); Children' s Hospital of Eastern Ontario (CHEO), Diagnostic Imaging Department, Ottawa (Canada); Daneman, Alan; Doria, Andrea S.; Blaser, Susan; Traubici, Jeffrey; Jarrin, Jose; Shroff, Manohar [Hospital for Sick Children, Department of Diagnostic Imaging, Toronto (Canada); Moineddin, Rahim [University of Toronto, Toronto (Canada); Moore, Aideen [Hospital for Sick Children, Department of Neonatology, Toronto (Canada)

    2012-09-15

    Color Doppler US (CDUS) has been used for evaluation of cerebral venous sinuses in neonates. However, there is very limited information available regarding the appearance of superficial and deep normal cerebral venous sinuses using CDUS and the specificity of the technique to rule out disease. To determine the specificity, inter-modality and inter-reader agreement of color Doppler US (CDUS). To evaluate normal cerebral venous sinuses in neonates in comparison to MR venography (MRV). Newborns undergoing a clinically indicated brain MRI were prospectively evaluated. All underwent a dedicated CDUS of the cerebral venous sinuses within 10 h (mean, 3.5 h, range, and 2-7.6 h) of the MRI study using a standard protocol. Fifty consecutive neonates participated in the study (30 males [60%]; 25-41 weeks old; mean, 37 weeks). The mean time interval between the date of birth and the CDUS study was 19.1 days. No cases showed evidence of thrombosis. Overall agreement for US reading was 97% (range, 82-100%), for MRV reading, 99% (range, 96-100%) and for intermodality, 100% (range, 96-100%). Excellent US-MRI agreement was noted for superior sagittal sinus, cerebral veins, straight sinus, torcular Herophili, sigmoid sinus, superior jugular veins (94-98%) and transverse sinuses (82-86%). In 10 cases (20%), MRV showed flow gaps whereas normal flow was demonstrated with US. Visualization of the inferior sagittal sinus was limited with both imaging techniques. Excellent reading agreement was noted for US, MRV and intermodality. CDUS is highly specific to rule out cerebral venous thrombosis in neonates and holds potential for clinical application as part of clinical-laboratory-imaging algorithms of pre/post-test probabilities of disease. (orig.)

  17. Evaluation of retrobulbar blood flow in patients with age-related cataract; color Doppler ultrasonographic findings

    Directory of Open Access Journals (Sweden)

    Mohammadi A

    2011-10-01

    Full Text Available Afshin Mohammadi1, Nilofar Khorasani2, Farzad Moloudi2, Mohammad Ghasemi-rad31Department of Radiology, Urmia University of Medical Sciences, Urmia, Iran; 2Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran; 3Genius and Talented Student Organization, Student Research Committee, Urmia University of Medical Sciences, Urmia, IranObjectives: Cataracts are the most common cause of blindness worldwide, with cataract surgery being the most common ophthalmic procedure. To our best knowledge, this is the first case-control study with a large number of participants to evaluate ocular blood flow in patients with cataracts.Materials and methods: Color Doppler and duplex sonography of the orbital vessels was performed in 224 eyes of 112 patients with known bilateral age-related cataracts and in 76 eyes of 38 healthy age- and sex-matched volunteers.Results: The mean ± (standard deviation [SD] of peak systolic velocity (PSV of the ophthalmic artery in patients with cataracts (34.59 ± 22.49 cm/second was significantly different to that in controls (52.11 ± 14.01 cm/second (P < 0.001. The mean ± SD PSV of the central retinal artery in patients with cataracts (15.31 ± 4.93 cm/second was significantly different to that in controls (9.61 ± 5.64 cm/second (P < 0.001.Conclusion: The mean PSV and resistive index (RI of the ophthalmic and central retinal arteries were lower in cataract patients when compared with normal subjects. This suggests that ocular hypoperfusion and changes in ocular hemodynamic may have a role in the formation of age-related cataracts.Keywords: retrobulbar blood flow, age-related, cataract, color Doppler ultrasonographic

  18. Therapeutic embolization of high-flow priapism 1 year follow up with color Doppler sonography

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, Song, E-mail: zhaosong1984@QQ.com; Zhou, Jun, E-mail: 18740585@QQ.COM; Zhang, Yi-Fan, E-mail: XXXzyf2011@163.com; Zhang, Xiao-Long, E-mail: 87512377@QQ.COM; Long, Qing-Yun, E-mail: longqy2005@aliyun.com

    2013-12-01

    Objective: The aim of this study was to evaluate the use of color Doppler sonography (CDS) for the diagnosis of high-flow priapism and the treatment of cavernosal arterial fistula via super-selective arterial embolization. Methods and materials: We reviewed eight cases of high-flow priapism with cavernosal arterial fistula, from 2005 to 2011. All of the patients were diagnosed with a high-flow priapism and unilateral artery fistula via CDS. Conventional treatments for the eight cases were unsuccessful, and the patients were then treated through super-selective embolization. Diagnostic angiograms of the internal iliac artery showed a fistula on one side of the cavernosal artery, thus confirming the CDS images. We compared hemodynamic parameters including the peak systolic velocity, end diastolic velocity the resistance index of the pathological cavernosal artery and intracavernosal pressure in all patients before and after treatment using t-test. The efficacy of super-selective embolization and the erectile function of all patients were evaluated at a follow-up time of 12 months. Results: All patients were successfully treated and angiography showed that the fistulas disappeared after treatment. Additionally significant differences were found in the peak systolic velocity, the end diastolic velocity, the resistance index and intracavernosal pressure between pre-treatment and post-treatment (P < 0.05). At 5 days post-treatment, only one case relapses had occurred. Seven cases displayed restored erectile function and only one case exhibited erectile dysfunction. Conclusion: Color Doppler sonography is a highly sensitive method for the examination of high-flow priapism, and super-selective embolization is a safe and effective treatment for cavernosal arterial fistula.

  19. Two-dimensional optical spectroscopy

    CERN Document Server

    Cho, Minhaeng

    2009-01-01

    Discusses the principles and applications of two-dimensional vibrational and optical spectroscopy techniques. This book provides an account of basic theory required for an understanding of two-dimensional vibrational and electronic spectroscopy.

  20. Utility of color Doppler transrectal ultrasound in the diagnosis of prostate cancer: a study of 101 cases; Utilidad de la ecografia transrectal con Doppler color en el diagnostico del cancer de prostata. Estudio de 101 casos

    Energy Technology Data Exchange (ETDEWEB)

    Morales, F. J.; Jornet, J.; Cervera, J.; Labrador, T. [Instituto Valenciano de Oncologia. Valencia (Spain)

    2001-07-01

    To determine the value of color Doppler ultrasound in the detection of prostate cancer. To relate asymmetries in vascularisation with the results of directed biopsy. Between May and November 2000, we studied 101 patients suspected of having prostate cancer. The selection criteria were a prostate-specific antigen level of over 3 ng/ml, suspicious digital rectal examination or both. The volume, capsule and internal architecture were assessed, focusing on nodules, suspicious hypoechoic areas and asymmetric color intensity. Sextant biopsies were carried out with an 18-gauge needle and samples were also taken of the areas of increased color intensity. (Author) 16 refs.

  1. 彩色多普勒超声诊断异位妊娠的临床意义%Clinical assessment of ectopic pregnancy by color Doppler sonography

    Institute of Scientific and Technical Information of China (English)

    张敏

    2011-01-01

    Objective: To evaluate clinical sigiificance of color Doppler ultrasound in diagnosis of ectopic pregnancy.Methods: 176 patients with suspected ectopic pregnancy were checked by transvaginal two-dimensional ultrasound, color Doppler flow imaging (CDFI), the results of the ultrasound and clinical pathology and follow-up datas were compared.Results: 148 cases of ultrasound diagnosis of ectopic preWancy and surgical and conservative treatment of clinically diagnosed 143 cases, false positive rate was 0.2% and false negative rate 0.14%, diagnostic accuracy was 96.6%.Conclusion:Color Doppler ultrasound diagnosis of ectopic pregnancy with high accuracy, diagnosis of ectopic pregnancy is intuitive,safe, convenient and reproducible is good, it can proviod reliable clinical basis for the diagnoaia.It has important clinical value and is preferred examination method in the ditWiosis of ectopic pregnancy.%目的:探讨彩色多普勒超声诊断异位妊娠的临床意义.方法:对176例临床可疑异位妊娠的患者,采用经阴道二维超声、彩色多普勒(CDFI)进行检查,将超声结果与临床病理以及随访资料进行对比.结果:超声诊断异位妊娠148例,经临床手术及保守治疗后确诊143例,假阳性率0.2%,假阴性率0.14%,诊断准确率为96.6%.结论:彩色多普勒超声检查对异位妊娠诊断准确性高,对异位妊娠诊断直观、安全、方便、重复性好,能为临床提供可靠诊断依据,具有重要的临床应用价值,是诊断异位妊娠的首选检查方法.

  2. Does color Doppler sonography improve the clinical assessment of patients with acute scrotum?

    Energy Technology Data Exchange (ETDEWEB)

    Pepe, Pietro [Urology Unit, Cannizzaro Hospital, Catania (Italy)]. E-mail: piepepe@hotmail.com; Panella, Paolo [Urology Unit, Cannizzaro Hospital, Catania (Italy); Pennisi, Michele [Urology Unit, Cannizzaro Hospital, Catania (Italy); Aragona, Francesco [Urology Unit, Cannizzaro Hospital, Catania (Italy)

    2006-10-15

    Introduction and objectives: Our experience concerning the use of color Doppler sonography (CDS) in the differential diagnosis of acute scrotum is reported. Material and methods: From July 2000 to July 2005, 155 patients (median 17.2 years) were admitted with a diagnosis of acute scrotum (unilateral in 150 cases, bilateral in 5). Along with a careful anamnesis and the physical exam, all patients underwent a CDS study of the scrotal content using a sonograph GE Logiq 500 with a multifrequency (7.5-10 MHz) linear probe Small Part. The following CDS parameters were evaluated: intensity of the color-power signal on the testicular parenchyma and on the epididymis; systolic peak velocity (SPV) and telediastolic velocity (TDV) in correspondence of the gonadal hilum. Ultrasound and flowmetry parameters registered on the painful testis were compared with those registered on the healthy controlateral testis. The reduction/absence versus the increase of color-power signal in the parenchyma and the reduction/absence versus the increase of SPV and TDV in the centripetal intratesticular arteries were considered presumptive of testicular torsion versus orchiepididymitis. Results: The results only refer to the 150 patients (300 testis) with acute monolateral scrotum. The clinical picture and the physical exam suggested a torsion of the spermatic cord in 40 cases, a spontaneous de-torsion in 5, an orchiepididymitis in 80, a blunt scrotal trauma in 15, a bulky epididymal cyst or a hydrocele in 4 and a testicular pain of unknown etiology in the remaining 6 cases. Standard US was pathological in 95 patients (63.3%); CDS was pathologic in 70 patients and in 42 of them suggested a testicular torsion. Fifty-three patients underwent surgical exploration: among 42 patients with a presumptive diagnosis of testicular torsion, the diagnosis was confirmed in 22 cases, no anomaly was found in 16 cases and in 4 patients a torsion of testicular appendix was found. The rupture of the tunica

  3. Usefulness of color and pulsed Doppler's in the evaluation of surgical portosystemic shunts in pediatric patients; Utilidad del Doppler color y pulsado en la valoracion de los shunts portosistemicos quirurgicos en la edad pediatrica

    Energy Technology Data Exchange (ETDEWEB)

    Berrocal, T.; Prieto, C.; Cortes, P.; Rodriguez, R.; Pastor, I. [Hospital Universitario La Paz. Madrid (Spain)

    2003-07-01

    Portosystemic shunts are performed to relieve symptomatic portal hypertension symptomatic or removal pressure in hepatic vascularisation in patients with Budd-Chiari's syndrome. Most surgical portosystemic shunts can be suitably studied by means of ultrasound scan complemented by color and pulsed Dopplers, proved one understands the hemodynamics of the surgical procedures involved. This article demonstrates the usefulness and limitations of the ultrasound scan Duplex Doppler in the evaluation of portosystemic shunts performed on pediatric patients. Pulsed Doppler provides information regarding the nature and direction of blood flow. Color doppler is capable of directly revealing the shunt and, in most cases, permits the anastomosis to be located. The types of shunts that appear include proximal and distal spleno-renal, portocaval and mesocaval. Types of vascular connections are illustrated,s well as expected post-surgical blood flow direction in affected vessels. The ultrasound scanning technique is discussed, as well as the criteria for determining vascular permeability. Also highlighted are the advantages, limitations and diagnostic difficulties associated with the different forms of Doppler. (Author) 17 refs.

  4. Análisis de perforantes de la epigástrica inferior profunda con Angio TC 3D, Eco Doppler color y Doppler simple de ultrasonidos en colgajo DIEP: resultados preliminares Analysis of deep inferior epigastric perforating vessels with 3D CT angiography, color Doppler ultrasonography and Doppler in diep flaps: preliminary results

    Directory of Open Access Journals (Sweden)

    J. Castro García

    2008-09-01

    Full Text Available Nuestro objetivo es la validación de la Angio TC tridimensional como herramienta de planificación de los colgajos DIEP, comparándolo con el Doppler de ultrasonidos (US y eco Doppler color. Entre enero de 2006 y marzo de 2007 se realiza en 11 pacientes (13 DIEP un estudio comparativo prospectivo entre el Doppler de US, eco Doppler color y Angio TC con reconstrucción tridimensional, utilizando como dato de referencia los hallazgos intraoperatorios. En dicho proceso se localiza la mejor perforante que pueda servir como pedículo al colgajo DIEP en función de su localización, calibre, trayecto y relaciones anatómicas con respecto al músculo. La Angio TC con reconstrucción tridimensional, demuestra una especificidad del 100% (IC 95% 75.3-100 lo que le convierte en una prueba con un alto valor predictivo positivo y una excelente herramienta en la planificación de los colgajos de perforantes. El eco Doppler color determinó, que tan sólo en un 46,1% (IC 95% 19,2-74,9 de los pacientes, la perforante seleccionada por la prueba de forma preoperatoria, coincidía con la perforante elegida en quirófano. Con el Doppler de US, en un 30,8 % (IC 95% 9,1-61,4 de los colgajos estudiados, coincidía la mejor perforante escogida de forma preoperatoria, con los hallazgos obtenidos tras la disección del colgajo. En el presente estudio, la Angio TC tridimensional se ha mostrado como una técnica con una gran especificidad que proporciona valiosa información, sólo comparable con la disección anatómica y por delante de pruebas como el Doppler de ultrasonidos y el eco Doppler color.The aim of this report, is to validate the Angio-CT technique with three-dimentional reconstruction as a preoperative planning tool, after comparison with Doppler ultrasound and color- Duplex. Between january 2006 and march 2007, we studied 11 consecutive patients (13 DIEP in whom a prospective comparative followed up was performed comparing, the findings observed using

  5. Effects of Mitral Balloon Valvuloplasty on Left Ventricular Systolic Functions: Assessment with Color Tissue Doppler

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    Cevat Kırma

    2010-04-01

    Full Text Available Objective: Left ventricular (LV systolic functions are generally depressed in Mitral Stenosis (MS. Recovery of LV systolic functions demonstrated with 2D echocardiography in some patients by mitral balloon valvuloplasty (MBV. Systolic mitral annular velocity (S' by Tissue Doppler Imaging (TDI predicts LV systolic function. We aimed to evaluate early effects of MBV on LV systolic function by TDI.Methods: Forty-eight consecutive patients included to the study (39 female, 36±10 years. A full transthoracic echocardiographic study (TTE including left ventricular ejection fraction assessment by teicholz method and mitral annular color TDI assessment was performed 24 hours before and after MBV in all patients. MBV performed by Inoue technique under guidance of TTE. Analysis of mitral lateral annular S' wave velocity was performed immediately after echocardiographic examination. Results: MBV performed successfully in 43 patients (Group A, and severe mitral regurgitation developed in 5 patients(Group B. Mitral valve area, and S’ wave velocity increased, mean and maximum mitral gradient, and left atrial diameter, and systolic pulmonary artery pressure (PAP were reduced significantly by MBV in group A patients (p<0.01, =0.046, <0.01, <0.01, <0.01, <0.01, respectively. But, only mitral valve area increased significantly ingroup B patients (p<0.01. LVEF by teicholz did not change significantly in both groups. Conclusion: Improvements of LV systolic functions after successfull MBV can easily showed by color TDI where2D echocardiography could not indicate.

  6. Role of color Doppler indices in predicting disease-free survival of breast cancer patients during neoadjuvant chemotherapy

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    Singh, Gurpreet, E-mail: guraiims@gmail.co [Medical Physics Unit, IRCH, AIIMS, New Delhi 110029 (India); Kumar, Pratik [Medical Physics Unit, IRCH, AIIMS, New Delhi 110029 (India); Parshad, Rajinder [Department of Surgery, AIIMS, New Delhi 110029 (India); Seith, Ashu; Thulkar, Sanjay [Department of Radiology, AIIMS, New Delhi 110029 (India); Hosten, Norbert [Department of Radiology, University of Greifswald, Greifswald 17489 (Germany)

    2010-08-15

    The aim of our study was to evaluate whether blood flow in locally advanced and inflammatory breast cancer before and after neoadjuvant chemotherapy using color Doppler ultrasonography can be used to monitor the response to therapy and identify possible correlations between survival and various Doppler indices. Fifty patients with breast cancer underwent Doppler evaluation of the tumor with determination of Doppler indices such as pulsatility index (PI), resistive index (RI), and peak systolic velocity (PSV). RI and PI decreased in 27 (54%) and 20 (40%) patients, respectively, and increased in 23 (46%) and 30 (60%) patients, respectively. Thirty (60%) patients showed a decrease in PSV and 20 (40%) patients an increase. Patients with an intratumoral blood flow velocity increase after chemotherapy had a greater likelihood of local recurrence and metastasis compared with patients in whom flow velocity decreased after chemotherapy. The study also confirmed a greater correlation between Doppler PSV and clinical assessment. Tumor flow velocity measured by Doppler ultrasound can be used as an independent marker of disease-free survival in patients with breast cancer.

  7. Ultrasonography and color Doppler of proximal gluteal enthesitis in juvenile idiopathic arthritis: a descriptive study

    Directory of Open Access Journals (Sweden)

    Thomsen Carsten

    2011-08-01

    Full Text Available Abstract Background The presence of enthesitis (insertional inflammation in patients with juvenile idiopathic arthritis (JIA is difficult to establish clinically and may influence classification and treatment of the disease. We used ultrasonography (US and color Doppler (CD imaging to detect enthesitis at the small and deep-seated proximal insertion of the gluteus medius fascia on the posterior iliac crest where clinical diagnosis is difficult. The findings in JIA patients were compared with those obtained in healthy controls and with the patients' MRI results. Methods Seventy-six proximal gluteus medius insertions were studied clinically (tenderness to palpation of the posterior iliac crest and by US and CD (echogenicity, thickness, hyperemia in 38 patients with JIA and in 38 healthy controls, respectively (median age 13 years, range 7-18 years. In addition, an additional MRI examination of the sacroiliac joints and iliac crests was performed in all patients. Results In patients with focal, palpable tenderness, US detected decreased echogenicity of the entheses in 53% of the iliac crests (bilateral in 37% and unilateral in 32%. US also revealed significantly thicker entheses in JIA patients compared to healthy controls (p Conclusions According to US, the gluteus medius insertion was thicker in JIA patients than in controls, and it was hypoechoic (enthesitis in about half of the patients. These findings may represent chronic, inactive disease in some of the patients, because there was only limited Doppler flow and MRI contrast enhancement. The present study indicates that US can be useful as an adjunct to clinical examination for improved assessment of enthesitis in JIA. This may influence disease classification, ambition to treat, and choice of treatment regimen.

  8. Comparison of brucella and non-specific epididymorchitis: gray scale and color Doppler ultrasonographic features

    Energy Technology Data Exchange (ETDEWEB)

    Ozturk, Adil [Department of Radiology, Harran University School of Medicine, Arastirma ve Uygulama Hastanesi, TR-63100 Sanliurfa (Turkey)]. E-mail: ozturka26@hotmail.com; Ozturk, Ebru [Department of Radiology, Harran University School of Medicine, Arastirma ve Uygulama Hastanesi, TR-63100 Sanliurfa (Turkey); Zeyrek, Fadile [Department of Microbiology, Harran University School of Medicine, Sanliurfa (Turkey); Onur, Kahraman [Department of Urology, SSK Sanliurfa Hastanesi, Sanliurfa (Turkey); Sirmatel, Ocal [Department of Radiology, Harran University School of Medicine, Arastirma ve Uygulama Hastanesi, TR-63100 Sanliurfa (Turkey); Kat, Nurcan [Department of Radiology, Harran University School of Medicine, Arastirma ve Uygulama Hastanesi, TR-63100 Sanliurfa (Turkey)

    2005-11-01

    Objective: The aim of this study is to find out if it is possible to differentiate between brucellar and non-specific epididymorchitis by comparing ultrasonography (US) and color Doppler ultrasonography (CDUS) findings. Material and methods: Fifty-six patients diagnosed to have epididymorchitis both clinically and ultrasonographically were included to study. All of the patients were investigated serologically for brucella. Twenty-eight of those patients were admitted brucella epididymorchitis because of high agglutinations titers for brucella. The other 28 patients were admitted non-specific epididymorchitis because of normal agglutinations titers for brucella. Testicular size, echogenicity, hydrocele, internal echoes and/or septations within hydrocele, and scrotal skin thickness of normal and involved testis were compared by ultrasonography. Besides, pick systolic velocity, end diastolic velocity, resistive index and pick systolic velocity ratio values were measured by bilateral testicular color Doppler ultrasonography in both groups. When the p-value is <0.05, the difference between groups is accepted as statistically significant. Results: Thickening of scrotal skin was seen in 17 of 28 patients with brucella epididymorchitis (BEPO) (67%) and in 25 of 28 patients with non-specific epididymorchitis (NEPO) (89.2%) (p < 0.01). There was no difference between groups regarding presence of hydrocele. However hydrocele seen in all patients was anechoic except for two patients (8.6%). Hydrocele seen in 18 of 22 patients with BEPO and hydrocele had internal echogenicity or septation (p < 0.001). Sizes of testes and epididymis were found to be increased in involved testis compared to normal testis. Testes of all patients with NEPO were homogenous with decreased echogenicity except for five patients (17.8%). However, 23 patients with BEPO (82%) found to have heterogenous testis (p < 0.001). Spectral measurements showed increased PSV and EDV values and decreased RI values in

  9. In-vivo imaging of blood flow in human retinal vessels using color Doppler optical coherence tomography

    Science.gov (United States)

    Yazdanfar, Siavash; Rollins, Andrew M.; Izatt, Joseph A.

    1999-04-01

    Quantification of retinal blood flow may lead to a better understanding of the progression and treatment of several ocular disorders, including diabetic retinopathy, age- related macular degeneration, and glaucoma. Current techniques, such as fluorescein angiography and laser Doppler velocimetry are limited, failing to provide sufficient information to the clinician. Color Doppler optical coherence tomography (CDOCT) is a novel technique using coherent heterodyne detection for simultaneous cross- sectional imaging of tissue microstructure and blood flow. This technique is capable of high spatial and velocity resolution imaging in highly scattering media. We implemented CDOCT for retinal blood flow mapping in human subjects. No dilation of the pupil was necessary. CDOCT is demonstrated for determining bidirectional flow in sub- 100micrometers diameter vessels in the retina. Additionally, we calculated Doppler broadening using the variance of depth- resolved spectra to identify regions with large velocity gradients within the Xenopus heart. This technique may be useful in quantifying local tissue perfusion in highly vascular retinal tissue.

  10. Assessment of parathyroid glands in hemodialysis patients by using color Doppler sonography.

    Science.gov (United States)

    Ozcan, Umit Aksoy; Oktay, Ilay

    2009-11-01

    The aim of this study was to assess the role of color and spectral Doppler ultrasound (CDU) in the evaluation of enlarged parathyroid glands in hemodialysis patients with secondary hyperparathyroidism. Fourteen hemodialysis patients with elevated intact parathyroid hormone (iPTH) levels were evaluated prospectively with CDU. The volume of each observed parathyroid gland and the spectral CDU data (velocities, resistance and pulsatility indices, systolic to diastolic ratio, and flow volume output (FVO)) were noted. The biochemical data (iPTH, calcium, phosphate levels), and CDU results were analyzed with the Spearman correlation test. Two patients were excluded, and 27 enlarged parathyroid glands were observed in 12 patients. The mean total volume of enlarged parathyroid glands per patient was 1.95 cm(3) (0.06-5.5 cm(3)). Arterial supply was demonstrated in 78% (21/27) of enlarged parathyroid glands. Mean total FVO of enlarged glands per patient was 238.5 ml/min (620-0 ml/min) and mean iPTH level was 1,477 pg/ml (643-3,132 pg/ml). The positive correlations of total volume (p = 0.022), iPTH (p = 0.024), and FVO (p = 0.022) were statistically significant. In secondary hyperparathyroidism, total volume of the visualized enlarged parathyroid glands and the total of FVOs per patient are positively correlated with iPTH levels which may help clinical management and follow-up of end-stage renal disease patients.

  11. COLOR DOPPLER ULTRASONOGRAPHY APPEARANCES OF RENAL VEIN THROMBOSIS AND ITS DIAGNOSTIC VALUE

    Institute of Scientific and Technical Information of China (English)

    Sheng Cai; Guang-xi Zhong; Jian-chu Li; Yu Xia; Hui-jun Li; Yu-xin Jiang

    2007-01-01

    Objective To evaluate color Doppler ultrasonography (CDU) appearances of renal vein thrombosis (RVT) and its diagnostic value.Methods Ten patients with RVT were analyzed retrospectively. Renal structure, distributions of intrarenal flow signals, echogenicity, and flow fullness in main renal veins were observed with CDU. Resistance index (RI) was recorded from the waveforms of segmental or interlobar renal artery.Results Ten kidneys in nine patients were confirmed to have thrombus within the main renal veins, and one patient was confirmed to have thrombus within the small intrarenal veins. The appearances of the main renal vein thrombosis included full of solid echogenicity or strip echogenicity and complete or partial filling defect within the main renal veins, and absent or a few intrarenal venous flow signals in 70% of kidneys involved. The appearances of intrarenal vein thrombosis included obscure renal structure and no venous flow signal within the involved part of the kidneys. Reverse diastolic flow in the intrarenal artery had only a sensitivity of 36% (4/11) ; in other 7 kidneys without intrarenal arterial reverse diastolic flow, increased RI (mean, 0.84; range, 0.74-0.96) was found.Conclusion CDU is helpful for rapid clinical diagnosis and follow-up of RVT, and therefore can be the first imaging modality of choice for RVT.

  12. MR imaging of multiple fibroadenoma in breast: comparison with color doppler images and histologic findings

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Soo Young; Yang, Ik; Park, Hai Jung; Lee, Yul; Chung, Bong Wha; Ahn, Hye Kyung [Hallym Univ. College of Medicine, Seoul (Korea, Republic of)

    1997-10-01

    To understand the different signal intensities seen on contrast enhanced magnetic resonance imaging (MRI) in multiple fibroadenoma of the breast, and to compare these with color Doppler ultrasonographic (CDUS) and histologic findings. MRI (1.0 Tesla, TIWI, T2WI, 3D-gradient echo dynamic contrast enhancement study) findings of 24 histologically proven cases of fibroadenoma in five patients were evaluated and compared with the histologic components (myxoid, adenomatous, fibrous). In addition, vascular flow, as seen on CDUS and histologic section, was compared. The observed degree of signal intensity waw classified into three groups, as follows: negative, 8.3%, mild to moderate, 54.2%; marked, 37.5%. On histologic section, the greater the fibrotic component, the higher the intensity of MRI enhancement, the greater the glandular component, and the intensity. CDUS showed vascular flow in only one tumor larger than 3cm in diameter. Vascular patterns of tumors on CDUS were dots in mass and detouring pattern, but in this case and in strongly enhanced cases, tumor vascularity-as seen on histologic section-showed no significant increase. Different signal intensities seen on contrast enhanced MRI in multiple fibroadenoma of the breast may be related more to the amount of glandular and fibrotic component than to increased tumor vascularity.

  13. Inverse Problem for Color Doppler Ultrasound-Assisted Intracardiac Blood Flow Imaging

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    Jaeseong Jang

    2016-01-01

    Full Text Available For the assessment of the left ventricle (LV, echocardiography has been widely used to visualize and quantify geometrical variations of LV. However, echocardiographic image itself is not sufficient to describe a swirling pattern which is a characteristic blood flow pattern inside LV without any treatment on the image. We propose a mathematical framework based on an inverse problem for three-dimensional (3D LV blood flow reconstruction. The reconstruction model combines the incompressible Navier-Stokes equations with one-direction velocity component of the synthetic flow data (or color Doppler data from the forward simulation (or measurement. Moreover, time-varying LV boundaries are extracted from the intensity data to determine boundary conditions of the reconstruction model. Forward simulations of intracardiac blood flow are performed using a fluid-structure interaction model in order to obtain synthetic flow data. The proposed model significantly reduces the local and global errors of the reconstructed flow fields. We demonstrate the feasibility and potential usefulness of the proposed reconstruction model in predicting dynamic swirling patterns inside the LV over a cardiac cycle.

  14. Clinical importance of color doppler ultrasonography in preoperative assessment of hemodialysis vascular access creation

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    Petrović Dejan

    2012-03-01

    Full Text Available Chronic kidney failure is characterized with progressive and ireversible diminishing of glomerular filtration rate. Arterio-venous fistula (AVF for hemodialysis should be created in patients with endogenous creatinine clearance ≤ 20 mL/min/1,73m2. Inner diameter of a. radialis ≥ 2.0 mm, inner diameter of v.cephalica ≥ 2.5 mm, flow velocity through the a.radialis - VmaxS ≥ 50 cm/s and flow through the a. radialis - Qa.radialis ≥ 40 mL/m intenable adequate maturing of distal radio-cephalic AVF. Diameter of v.cephalica ≥ 4.0 mmand blood flow Q AV ≥ 500 mL/min, four weeks after the AVF creation, indicate adequately matured AVF and possibility of puncturing it. Maximal blood flow velocity through AVF of 100-350 cm/s and blood flow of 500-1000 mL/min, are signs of good function of AVF and adequate hemodialysis. Color Doppler ultrasonography enables preoperative planning of AVF, early complication detection, choice of appropriate therapeutical procedure for complication treatment, estimation of maturation, prime time for puncture and AVF function, which all contribute to a significant morbidity decrease and better life quality in hemodialysis patients.

  15. Role of color Doppler flow imaging in applicable anatomy of spleen vessels

    Institute of Scientific and Technical Information of China (English)

    Wei-Li Xu; Suo-Lin Li; Yan Wang; Meng Li; Ai-Guo Niu

    2009-01-01

    AIM: To explore the role of color Doppler flow imaging (CDFI) in visualization of spleen vessels and to define its value for spleen micro-invasive operation. METHODS: A total of 36 patients requiring laparoscopic splenectomy (LS) for various hematopathies and autoimmune diseases were randomly selected from April 2005 to May 2008. Anatomic types of spleen pedicle, adjacent relations between spleen vessels and pancreas, diameters of spleen artery and vein were detected and recorded by preoperative CDFI. Different operative procedures were performed according to different anatomic frameworks. The parameters were recorded by telerecording during LS and compared with those by preoperative CDFI using Chi-square test. RESULTS: Two anatomic types of spleen pedicle and four different adjacent relations between spleen vessels and pancreas were detected by CDFI. The diameters of spleen artery and vein detected by CDFI were 0.46 ± 0.09 cm and 0.85 ± 0.35 cm, respectively. There was no statistical difference between the parameters recorded by CDFI and by telerecording (χ2 = 0.250, 0.677, P > 0.05). LS was successfully performed following the anatomic information provided by preoperative CDFI.CONCLUSION: Different anatomic frameworks of spleen vessels can be provided by preoperative CDFI,which instructs micro-invasive operation of spleen and increase the safety of operation.

  16. Evaluation of renal artery stenosis using color Doppler sonography in young patients with multiple renal arteries

    Institute of Scientific and Technical Information of China (English)

    QIN Wei; ZHANG Xin; YANG Min; ZHONG Xu-hui; ZHAO Ming-hui

    2011-01-01

    Background Some individuals have multiple renal arteries. Severe stenosis in one of the arteries may cause refractory hypertension. The detection of stenosis within one of the multiple renal arteries usually required invasive procedures, such as computed tomographic angiography (CTA) and magnetic resonance angiography (MRA). This study reported the application of color Doppler sonography (CDS) in the detection of severe stenosis in one of the multiple arteries.Methods Patients with multiple renal arteries and one of the arteries with severe stenosis were retrospectively studied. Peak systolic velocities (PSV) of renal arteries and the intrarenal CDS patterns were collected and compared. The diagnosis was confirmed by digital subtraction angiography (DSA).Results Four children with multiple renal arteries and one of the arteries with stenosis were investigated. They were admitted due to refractory hypertension. CDS screening identified two renal arteries in one kidney of each patient with one of the two renal arteries having stenosis >70%. The PSV of the stenosed arteries were much higher, and the intrarenal CDS patterns supplied by the stenosed arteries changed into T-P patterns.Conclusion Non-invasive CDS technology may be a useful method to identify severe stenosis in one of multiple renal arteries in young patients.

  17. Granulomatous Prostatitis: Gray-scale Transrectal Ultrasonography and Color Doppler Ultrasonography Findings

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    Kim, Hyoung Jung; Lim, Joo Won; Lee, Dong Ho; Ko, Young Tae; Kim, Eui Jong [Kyung Hee University Medical Center, Seoul (Korea, Republic of)

    2007-12-15

    We report here three cases of granulomatous prostatitis. All cases were confirmed by a transrectal ultrasonography (TRUS)-guided core biopsy of the prostate. Two cases received intravesical BCG therapy for a bladder tumor, and one case had no known predisposing condition. Gray-scale TRUS showed low echoic nodules in the outer gland in all cases. Color Doppler ultrasonography (CDUS) showed several dot-like blood flows within the low echoic nodules in two cases and several dot-like blood flows and short linear blood flows within the low echoic nodules in one case. Gray-scale TRUS findings of granulomatous prostatitis are similar to findings of prostate cancer. On CDUS, several dot-like blood flows or short linear blood flows were noted within the low echoic nodules in patients with granulomatous prostatitis. If low echoic nodules with dot-like or short linear blood flows are noted in patients with genitourinary tract tuberculosis or previous BCG therapy, granulomatous prostatitis should be included in the differential diagnosis. However, a prostatic biopsy is required for a final diagnosis

  18. Comparison of pulsed wave and color Doppler myocardial velocity imaging in healthy dogs.

    Science.gov (United States)

    Wess, G; Killich, M; Hartmann, K

    2010-01-01

    Tissue velocity imaging (TVI) is increasingly used in small animal cardiology. Tissue velocity of the myocardial wall can be measured by pulsed wave (PW) or color Doppler (CD) imaging methods. Currently, the same reference ranges are used for PW TVI and CD TVI methods. However, if and how both methods correlate, and whether they can be used interchangeably, have not been assessed in small animals. To compare the results of PW TVI and CD TVI measurements. Seventy-one healthy dogs. Longitudinal myocardial velocity profiles were recorded from the 4-chamber left apical view. Peak maximal systolic (S), early (E), and late diastolic (A) velocities were measured off-line in a blinded fashion in the septal and lateral left ventricular wall by PW TVI and CD TVI. Differences between peak PW TVI and CD TVI waves were analyzed by a paired t-test. Regression analysis and Bland-Altman difference plots also were used to assess agreement between methods. There was a significant correlation between PW TVI and CD TVI (P Theses differences are clinically relevant. These methods should not be used interchangeably, and different reference ranges for PW TVI and CD TVI should be used.

  19. Role of Color Doppler Imaging in Early Diagnosis and Prediction of Progression in Glaucoma

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    Fatima Jimenez-Aragon

    2013-01-01

    Full Text Available This longitudinal and prospective study analyzes the ability of orbital blood flow measured by color Doppler imaging (CDI to predict glaucoma progression in patients with glaucoma risk factors. Patients with normal perimetry but having glaucoma risk factors and patients in the initial phase of glaucoma were prospectively included in the study and divided, after a five-year follow-up, into two groups: “Progression” and “No Progression” based on the changes in the Moorfields regression analysis (MRA classification of Heidelberg retina tomograph (HRT. An orbital CDI was performed in all patients and the parameters obtained were correlated with changes in HRT. A logistic discrimination function (LDF was calculated for ophthalmic artery (OA and central retinal artery (CRA parameters. Receiver operating characteristics curves (ROC were used to assess the usefulness of LDFs to predict glaucomatous progression. A total of 71 eyes were included. End-diastolic velocity, time-averaged velocity, and resistive index in the OA and CRA were significantly different (P<0.05 between the Progression and No Progression groups. The area under the ROC curves calculated for both LDFs was of 0.695 (OA and 0.624 (CRA. More studies are needed to evaluate the ability of CDI to perform early diagnosis and to predict progression in glaucoma in eyes.

  20. Diagnostic value of color Doppler ultrasonography and MDCT angiography in complications of hemodialysis fistulas and grafts

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    Cansu, Aysegul, E-mail: drcansu@gmail.com [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Soyturk, Mehmet; Ozturk, Mehmet Halil; Kul, Sibel [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Pulathan, Zerrin [Department of Cardiovascular Surgery, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Dinc, Hasan [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey)

    2013-09-15

    Purpose: The purpose of the study was to compare the diagnostic value of color Doppler ultrasonography (CDUS) and multidetector computed tomography (MDCT) angiography against that of digital subtraction angiography (DSA) or surgery in the evaluation of failing hemodialysis arteriovenous fistulas (AVFs). Materials and methods: CDUS and MDCT angiography were performed with 41 patients (24 men, 17 women; mean age 55.8) with dysfunctional hemodialysis fistulas. The presence of stenosis, thrombosis, aneurysm, pseudoaneurysm and seroma were recorded. The sensitivity, specificity, positive and negative predictive values (PPV and NPV) and accuracy of CDUS and MDCT angiography were calculated both individually and in combination for the detection of vascular segments with significant stenosis, thrombosis, aneurysms, pseudoaneurysms, perivascular complications and stenosis subgroups. Results: Sixty-four segmental lesions were diagnosed by DSA or surgery. Sensitivity, specificity, PPV, NPV and accuracy of CDUS for all vascular tree lesions were 85.9%, 99.2%, 96.4%, 96.7% and 94.5%, respectively. For MDCT angiography the figures were 96.8%, 99.6%, 98.4%, 99.2% and 98.5%, respectively. When both tests were used in combination, sensitivity, specificity, PPV, NPV and accuracy for all vascular tree lesions rose to 100%. Conclusion: Combined use of MDCT and CDUS for diagnosis of AVF dysfunctions is of equivalent value to surgery or DSA, a gold standard technique.

  1. CTA in the detection and quantification of vertebral artery pathologies: a correlation with color Doppler sonography

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    Puchner, Stefan; Rand, Thomas; Reiter, Markus; Lammer, Johannes; Bucek, Robert A. [Medical University Vienna, Department of Cardiovascular and Interventional Radiology, Vienna (Austria); Haumer, Markus; Minar, Erich [Medical University Vienna, Department of Angiology, Vienna (Austria)

    2007-08-15

    We evaluated the feasibility of multidetector CT angiography (MDCTA) in the examination of vertebral artery (VA) pathologies and correlated the results with those of color Doppler sonography (CDS). In this retrospective cohort analysis, we identified 65 patients with suspected cerebrovascular disease, who underwent MDCTA and CDS of the supraaortic vessels within a maximum period of 1 month. We evaluated the feasibility and image quality of MDCTA in this indication, compared the value of reformatted images and axial source images in the grading of stenoses and correlated these results with those of CDS. The image quality of the MDCTA examination was classified as good in 64 patients (98.5%) and as moderate in 1 patient (1.5%). Axial source images and reformatted images agreed perfectly in terms of stenosis detection and grading as well as the detection of hypoplastic VAs ({kappa} = 1). The correlation between MDCTA and CDS was moderate ({kappa} = 0.56) in terms of stenosis detection and quantification and poor ({kappa} = 0.35) in terms of detection of hypoplasia of the VA. MDCTA is a feasible method for the evaluation of VA pathologies providing a good image quality. Image reformatting does not add any diagnostic value to the interpretation of axial source images. The correlation between MDCTA and CDS is only moderate, reflecting the clinically important limitations of CDS in this indication. (orig.)

  2. Color Doppler velocity profile and contrast-enhanced ultrasonography in assessment of liver cirrhosis

    Institute of Scientific and Technical Information of China (English)

    Li-Wu Lin; Xue-Jun Duan; Xiao-Yan Wang; En-Sheng Xue; Yi-Mi He; Shang-Da Gao; Li-Yun Yu

    2008-01-01

    BACKGROUND:This study was designed to probe the clinical value in assessing the degree of liver cirrhosis by using the arrival time of contrast agent in the right portal vein in contrast-enhanced ultrasonography, as well as the velocity and lfow volume in the right portal vein using the color Doppler velocity proifle technique. METHODS:Twenty-eight patients with HBV post-hepatic cirrhosis were grouped into compensated (13 patients) and decompensated cirrhosis (15); 30 patients without hepatic cirrhosis served as controls. Written informed consent was obtained from each patient. All the patients with hepatic cirrhosis were pathologically conifrmed by percutaneous biopsy. SonoVue was injected to detect the arrival time in the right portal vein. The velocity and lfow volume in the right portal vein were measured. The value of each parameter was compared for correlation analysis. RESULTS: The arrival time in the right portal vein in the cirrhosis group was much longer than that in the control group (24.92±1.34 vs. 20.81±0.55 sec, respectively, P CONCLUSIONS:With the development of liver cirrhosis, the arrival time of contrast agent in the right portal vein is gradually prolonged, whereas the velocity and lfow volume in this vein decreases markedly, and there is a negative correlation between the results of the two methods.

  3. Color Doppler ultrasound evaluation of asphyxial neonatal left ventricular function and its correlation with target organ damage

    Institute of Scientific and Technical Information of China (English)

    Cheng-Cai Chen; Li-Zhen Li; Qi-Sheng Lu; Yan-Ling Lang

    2017-01-01

    Objective:To study the color Doppler ultrasound parameters of asphyxial neonatal left ventricular function and the correlation with target organ damage.Methods: Normal neonates, mildly asphyxial neonates and severely asphyxial neonates born in our hospital between January 2014 and December 2015 were selected as the control group (n = 46), mild asphyxia group (n= 37) and severe asphyxia group (n = 23) respectively. On the 1st day after birth, color Doppler ultrasound was used to evaluate left ventricular function, and serum was collected to determine myocardial tissue injury, brain tissue injury and brain tissue metabolism indexes. Results: Color Doppler ultrasound parameters cardiac output (CO), ejection fraction (EF) and left ventricular fraction shortening (FS) as well as serum folate and vitamin B12 content of mild asphyxia group and severe asphyxia group were significantly lower than those of control group (P<0.05) while serum creatine kinase isoenzyme (CK-MB), troponin I (cTnI), troponin T (cTnT), S100B, neuron-specific enolase (NSE), creatine kinase BB (CK-BB), glycogen phosphorylase BB (GPBB), and homocysteine (Hcy) content were significantly higher than those of control group (P<0.05); CO, FS and EF as well as serum folate and vitamin B12 content of severe asphyxia group were significantly lower than those of mild asphyxia group (P<0.05) while serum CK-MB, cTnT, cTnI, S100B, NSE, CK-BB, GPBB and Hcy content were significantly higher than those of mild asphyxia group (P<0.05).Conclusions:Color Doppler ultrasound can accurately assess asphyxial neonatal left ventricular function damage degree and is closely related to myocardial tissue injury and brain tissue injury degree.

  4. Color Doppler Imaging of the Appendix: Criteria to Improve Specificity for Appendicitis in the Borderline-Size Appendix.

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    Xu, Yingding; Jeffrey, R Brooke; Shin, Lewis K; DiMaio, Michael A; Olcott, Eric W

    2016-10-01

    To test the hypothesis that continuous intramural vascular signal measuring at least 3 mm on color Doppler imaging is highly specific for appendicitis in patients with diagnostically borderline-size appendices. Two blinded observers independently reviewed color Doppler images of the appendix in 94 consecutive patients who had undergone sonography for suspected appendicitis and whose appendices were of diagnostically borderline size (6-8 mm maximum outer diameter). Intramural vascular flow on color Doppler images was classified as absent, type 1 (only punctate and dispersed signal), or type 2 (continuous linear or curvilinear signal measuring at least 3.0 mm in long- or short-axis views). Histopathologic examination and clinical follow-up served as reference standards. Proportions were assessed by the exact binomial test. Of the 94 patients, 33 (35.1%) had type 1 flow (of whom 5 [15.2%] had appendicitis); 23 (24.5%) had type 2 flow (of whom 20 [87.0%] had appendicitis); and 38 (40.4%) had absent flow (of whom 10 [26.3%] had appendicitis). The sensitivity, specificity, and odds ratio of type 2 flow as an indicator of appendicitis were 57.1%, 94.9%, and 24.9 (Pappendicitis in noncompressible appendices of diagnostically borderline size (6-8 mm).

  5. COLOR DOPPLER EVALUA TION OF HEPATIC VESS ELS AND PORTAL VENOUS SYSTEM IN LIV ER DISEASES WITH PAT HOLOGICAL CPRRELATION

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    Sanjeev

    2015-10-01

    Full Text Available Color Doppler sonography is an important noninvasive procedure for detecting abnormalities in hepatic vasculature in various liver diseases. Ultrasound findings associated with portal hypertension include enlarged diameter of the portal vein, lack of respiratory variation in the portal vein or its tributaries, hepatofungal portal flow direction, decreased portal velocity or volume, and the presence of collaterals or varices. Not only portal hypertension but various other liver diseases are associated with abnormalities noted in hepatic vasculature. An abnormal liver texture and ascites are also commonly seen and are usually related to accompanying cirrhosis. PORTAL VEIN : The portal vein is seen in about 97% of normal patients; failure to visualize it can suggest the presence of pathology, such as thrombosis. No intraluminal echoes with frequent echogenic border. HEPATIC ARTERY: Proximal hepatic artery is best seen at celiac trunk while distal hepatic artery is seen at the level of main portal vein. On Doppler assessment low resistant waveform pattern is seen with systolic and diastolic component. IVC ( INFERIOR VENA CAVA : Normal IVC has Low level intra luminal echoes within the lumen and changes occur during respiration. On Doppler assessment continuous triphasic waveform with respiratory variation. HEPATIC VEIN: Color Doppler is a key tool, since the hepatic veins may be difficu lt to visualize with B - mode imaging alone when the liver is enlarged or cirrhotic . AIM : To evaluate the abnormalities of hepatic vessels and portal vein in various liver diseases and role of colour Doppler in portal and hepatic vessels various liver diseas e with histopathological correlation. MATERIAL AND METHOD : A prospective study and is conducted in Department of Radiodiagnosis, N.S.C.B. Medical College, Jabalpur M.P., over a period of one year ( 2011 - 2012. To evaluate the colour Doppler of hepatic vess els and portal venous system in liver disease with

  6. Hemodynamic analysis of esophageal varices in patients with liver cirrhosis using color Doppler ultrasound

    Institute of Scientific and Technical Information of China (English)

    Feng-Hua Li; Jing Hao; Jian-Guo Xia; Hong-Li Li; Hua Fang

    2005-01-01

    AIM: To study the portal hemodynamics and their relationship with the size of esophageal varices seen at endoscopy and to evaluate whether these Doppler ultrasound parameters might predict variceal bleeding in patients with liver cirrhosis and portal hypertension.METHODS: One hundred and twenty cirrhotic patients with esophageal varices but without any previous bleeding were enrolled in the prospective study. During a 2-year observation period, 52 patients who had at least one episode of acute esophageal variceal hemorrhage constituted the bleeding group, and the remaining 68 patients without any previous hemorrhage constituted the non-bleeding group. All patients underwent endoscopy before or after color Doppler-ultrasonic examination, and images were interpreted independently by two endoscopists. The control group consisted of 30 healthy subjects, matched to the patient group in age and gender. Measurements of diameter,flow direction and flow velocity in the left gastric vein (LGV) and the portal vein (PV) were done in all patients and controls using color Doppler unit. After baseline measurements, 30 min after oral administration of 75 g glucose in 225 mL, changes of the diameter, flow velocity and direction in the PV and LGV were examined in 60 patients with esophageal varices and 15 healthy controls.RESULTS: The PV and LGV were detected successfully in 115 (96%) and 105 (88%) of 120 cirrhotic patients,respectively, and in 27 (90%) and 21 (70%) of 30 healthy controls, respectively. Among the 120 cirrhotic patients,37 had F1, 59 had F2, and 24 had F3 grade varices. Compared with the healthy controls, cirrhotic group had a significantly lower velocity in the PV, a significantly greater diameter of the PV and LGV, and a higher velocity in the LGV. In the cirrhotic group, no difference in portal flow velocity and diameter were observed between patients with or without esophageal variceal bleeding (EVB). However, the diameter and blood flow velocity of the LGV were

  7. Cerebral vascular effects of loading dose of dexmedetomidine: A Transcranial Color Doppler study

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    Appavoo Arulvelan

    2016-01-01

    Full Text Available Background: Dexmedetomidine has been widely used in critical care settings because of its property of maintaining stable hemodynamics and inducing conscious sedation. The use of dexmedetomidine is in increasing trend particularly in patients with neurological disorders. Very few studies have focused on the cerebral hemodynamic effects of dexmedetomidine. This study is aimed to address this issue. Methods: Thirty patients without any intracranial pathology were included in this study. Middle cerebral artery flow velocity obtained from transcranial color Doppler was used to assess the cerebral hemodynamic indices. Mean flow velocity (mFV, pulsatility index (PI, cerebral vascular resistant index (CVRi, estimated cerebral perfusion pressure (eCPP, and zero flow pressure (ZFP were calculated bilaterally at baseline and after infusion of injection Dexmedetomidine 1 mcg/Kg over 10 min. Results: Twenty-six patients completed the study protocol. After administration of loading dose of dexmedetomidine, mFV and eCPP values were significantly decreased in both hemispheres (P < 0.05; PI, CVRi, and ZFP values showed significant increase (P < 0.05 after dexmedetomidine infusion. Conclusion: Increase in PI, CVRi, and ZFP suggests that there is a possibility of an increase in distal cerebral vascular resistance (CVR with loading dose of dexmedetomidine. Decrease in mFV and eCPP along with an increase in CVR may lead to a decrease in cerebral perfusion. This effect can be exaggerated in patients with preexisting neurological illness. Further studies are needed to evaluate the effect of dexmedetomidine on various other pathological conditions involving brain like traumatic brain injury and vascular malformations.

  8. Color Doppler ultrasound and gamma imaging of intratumorally injected 500 nm iron-silica nanoshells.

    Science.gov (United States)

    Liberman, Alexander; Wu, Zhe; Barback, Christopher V; Viveros, Robert; Blair, Sarah L; Ellies, Lesley G; Vera, David R; Mattrey, Robert F; Kummel, Andrew C; Trogler, William C

    2013-07-23

    Perfluoropentane gas filled iron-silica nanoshells have been developed as stationary ultrasound contrast agents for marking tumors to guide surgical resection. It is critical to establish their long-term imaging efficacy, as well as biodistribution. This work shows that 500 nm Fe-SiO2 nanoshells can be imaged by color Doppler ultrasound over the course of 10 days in Py8119 tumor bearing mice. The 500 nm nonbiodegradable SiO2 and biodegradable Fe-SiO2 nanoshells were functionalized with diethylenetriamine pentaacetic acid (DTPA) ligand and radiolabeled with (111)In(3+) for biodistribution studies in nu/nu mice. The majority of radioactivity was detected in the liver and kidneys following intravenous (IV) administration of nanoshells to healthy animals. By contrast, after nanoshells were injected intratumorally, most of the radioactivity remained at the injection site; however, some nanoshells escaped into circulation and were distributed similarly as those given intravenously. For intratumoral delivery of nanoshells and IV delivery to healthy animals, little difference was seen between the biodistribution of SiO2 and biodegradable Fe-SiO2 nanoshells. However, when nanoshells were administered IV to tumor bearing mice, a significant increase was observed in liver accumulation of SiO2 nanoshells relative to biodegradable Fe-SiO2 nanoshells. Both SiO2 and Fe-SiO2 nanoshells accumulate passively in proportion to tumor mass, during intravenous delivery of nanoshells. This is the first report of the biodistribution following intratumoral injection of any biodegradable silica particle, as well as the first report demonstrating the utility of DTPA-(111)In labeling for studying silica nanoparticle biodistributions.

  9. Adaptive clutter rejection for 3D color Doppler imaging: preliminary clinical study.

    Science.gov (United States)

    Yoo, Yang Mo; Sikdar, Siddhartha; Karadayi, Kerem; Kolokythas, Orpheus; Kim, Yongmin

    2008-08-01

    In three-dimensional (3D) ultrasound color Doppler imaging (CDI), effective rejection of flash artifacts caused by tissue motion (clutter) is important for improving sensitivity in visualizing blood flow in vessels. Since clutter characteristics can vary significantly during volume acquisition, a clutter rejection technique that can adapt to the underlying clutter conditions is desirable for 3D CDI. We have previously developed an adaptive clutter rejection (ACR) method, in which an optimum filter is dynamically selected from a set of predesigned clutter filters based on the measured clutter characteristics. In this article, we evaluated the ACR method with 3D in vivo data acquired from 37 kidney transplant patients clinically indicated for a duplex ultrasound examination. We compared ACR against a conventional clutter rejection method, down-mixing (DM), using a commonly-used flow signal-to-clutter ratio (SCR) and a new metric called fractional residual clutter area (FRCA). The ACR method was more effective in removing the flash artifacts while providing higher sensitivity in detecting blood flow in the arcuate arteries and veins in the parenchyma of transplanted kidneys. ACR provided 3.4 dB improvement in SCR over the DM method (11.4 +/- 1.6 dB versus 8.0 +/- 2.0 dB, p < 0.001) and had lower average FRCA values compared with the DM method (0.006 +/- 0.003 versus 0.036 +/- 0.022, p < 0.001) for all study subjects. These results indicate that the new ACR method is useful for removing nonstationary tissue motion while improving the image quality for visualizing 3D vascular structure in 3D CDI.

  10. Color Doppler Ultrasound in Diagnosis and Assessment of Carotid Body Tumors: Comparison with Computed Tomography Angiography.

    Science.gov (United States)

    Jin, Zhan-Qiang; He, Wen; Wu, Dong-Fang; Lin, Mei-Ying; Jiang, Hua-Tang

    2016-09-01

    A carotid body tumor (CBT) is a rare, non-chromaffin paraganglioma, and its diagnosis mainly depends on imaging modalities. The aim of this study was to investigate the ability of color Doppler ultrasound (CDU) in the diagnosis and assessment of CBT based on computed tomography (CT). We retrospectively reviewed the CDU and CT features of 49 consecutive CBTs and 23 schwannomas from 67 patients and compared these findings with surgical resection specimens. The mean size of CBT lesions on ultrasound scans and CT angiography (CTA) was 3.24 cm ± 0.82 cm (range, 1.6-5.2 cm) and 3.84 cm ± 1.08 cm (range, 1.8-6.8 cm), respectively, which had statistically significant difference (t = 9.815, p = 0.000). The vascularity of CBT lesions was richer than that of schwannoma lesions (p CDU in identifying Shamblin type I CBT lesions, while CTA technique was superior for CDU, identifying Shamblin type II and III CBT lesions. Accuracy, specificity and sensitivity of CDU in diagnosing CBTs were 87.5% (63 of 72), 82.6% (19 of 23) and 89.8% (44 of 49), respectively. Both accuracy and sensitivity of CTA in diagnosing CBTs were 100%. CDU can be useful for assessment of Shamblin's type and intra-lesional blood flow of CBTs before its metastases, while CT imaging can reveal the relationship between lesions and adjacent arteries, as well as the involvement of the skull base. CDU combined with CT imaging can be used as an optimal detection modality for the assessment and management of CBT.

  11. The role of the color doppler ultrasonography and computed tomography in estimation of portal hypertension

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    Nićiforović Dijana

    2016-01-01

    Full Text Available Introduction. Liver diseases with disturbances of hepatic and splanchnic circulation lead to the portal hypertension, with or without a portal vein thrombosis. Objective. This study was based on the testing of hypothesis that more data and more precise diagnosis in patients with disorders of portal circulation can be obtained by using color Doppler ultrasonography (CDU and computed tomography (CT with contrast. Methods. The study was conducted from February 2011 to May 2014 and it comprised 120 patients who were suspected to have portal hypertension or already had clinical confirmation of the portal hypertension, patients with hepatitis, and some patients with hematological diseases. The first group of 40 patients was examined by conventional ultrasonography and CDU, the second group by contrast CT, and the third group of patients was examined by both methods (CDU and contrast CT. After six months of adequate therapy, the patients had control examinations with the same diagnostic technique used during their first examination. Results. Retrospective analysis showed that CDU is more sensitive than CT in the assessment of presence and age of thrombi (CDU 93.9%; CT 86.1%. CT gives precise data in detection of portosystemic collaterals. Sensitivity of CT is 100% and its specificity is 67%. Cumulative sensitivity and specificity for most parameters were increased in patients with portal hypertension when both methods were applied. Conclusion. This study emphasizes the possibility of early and more accurate diagnosis achieved when combining two radiological techniques (CDU and contrast CT scan, which is not the case when these methods are used separately.

  12. Color Doppler Ultrasonography-Targeted Perforator Mapping and Angiosome-Based Flap Reconstruction.

    Science.gov (United States)

    Gunnarsson, Gudjon Leifur; Tei, Troels; Thomsen, Jørn Bo

    2016-10-01

    Knowledge about perforators and angiosomes has inspired new and innovative flap designs for reconstruction of defects throughout the body. The purpose of this article is to share our experience using color Doppler ultrasonography (CDU)-targeted perforator mapping and angiosome-based flap reconstruction throughout the body. The CDU was used to identify the largest and best-located perforator adjacent to the defect to target the reconstruction. The cutaneous or fasciocutaneous flaps were raised, mobilized, and designed according to the reconstructive needs as rotation, advancement, or turnover flaps. We performed 148 reconstructions in 130 patients. Eleven facial reconstructions, 118 reconstructions in the body, 7 in the upper limbs, and 12 in the lower limbs. The propeller flap was used in 135 of 148 (91%) cases followed by the turnover design in 10 (7%) and the V to Y flap in 3 (2%) cases. The flaps were raised on 1 perforator in 98 (67%), 2 perforators in 48 (33%), and 3 perforators in 2 (1%) flaps. The reconstructive goal was achieved in 143 of 148 reconstructions (97%). In 5 cases, surgical revision was needed. No flaps were totally lost indicating a patent pedicle in all cases. We had 10 (7%) cases of major complications and 22 (15%) minor complications. The CDU-targeted perforator mapping and angiosome-based flap reconstruction are simple to perform, and we recommended its use for freestyle perforator flap reconstruction. All perforators selected by CDU was identified during surgery and used for reconstruction. The safe boundaries of angiosomes remain to be established.

  13. Color doppler ultrasonography and multislice computer tomography angiography in carotid plaque detection and characterization

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    Vučaj-Ćirilović Viktorija

    2011-01-01

    Full Text Available Beckground/Aim. Cerebrovascular diseases are the third leading cause of mortality in the world, following malignant and cardiovascular diseases. Therefore, their timely and precise diagnostics is of great importance. The aim of this study was to compare duplex scan Color Doppler ultrasonography (CDU with multislice computed tomography angiography (MSCTA in detection of morphological and functional disorders at extracranial level of carotid arteries. Methods. The study included 75 patients with 150 carotid arteries examined in the period from January 2008 to April 2009. The patients were firstly examined by CDU, then MSCTA, followed by the surgery of extracranial segment of carotid arteries. In 10 patients, the obtained material was referred for histopathological (HP examination. We used both CDU and MSCT in the analysis of: plaque surface, plaque structure, degree of stenosis, and the presence of intraplaque hemorrhage. Results. The results obtained by CDU and MSCTA were first compared between themselves, and then to intraoperative findings. Retrospective analysis showed that MSCTA is more sensitive than CDU in assessment of plaque surface (for smooth plaques CDU 89% : MSCTA 97%; for plaques with irregular surface CDU 75% : MSCTA 87%; for ulcerations CDU 54% : MSCTA 87%. Regarding determination of plaque structure (mixed plaque CDU 66% : MSCTA 70%; correlation with HP findings CDU 94% : MSCTA 96% and localization (CDU 63% : MSCTA 65%, and in terms of sensitivity and specificity, both methods showed almost the same results. Also, there is no statistical difference between these two methods for the degree of stenosis (CDU 96% : MSCTA 98%. Conclusion. Atherosclerotic disease of extracranial part of carotid arteries primarily affects population of middle-aged and elderly, showing more associated risk factors. Sensitivity and specificity of CDU and MSCTA regarding plaque composition, the degree of stenosis and plaque localization are almost the same

  14. Normal reference values for vertebral artery flow volume by color Doppler sonography in Korean adults

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    Hong, Hyun Sook; Cha, Jang Gyu; Park, Seong Jin; Joh, Joon Hee; Park, Jai Soung; Kim, Dae Ho; Lee, Hae Kyung; Ahn, Hyun Cheol [Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of)

    2003-09-15

    Vertebrobasilar ischemia has been attributed to a reduction of net vertebral artery flow volume. This study was to establish the reference values for the flow volume of the vertebral artery using color Doppler sonography in the normal Korea adults. Thirty five normal Korea adults without any underlying disease including hypertension, hyperlipidemia, diabetes, heart disease, obesity (body mas index>30), or carotid artery stenosis was included. There were 17 males and 18 females, age ranged from 20 to 53 years (average=32.86 years). Flow velocities and vessel diameters were recorded in the intertransverse (V2) segment, usually at C5-6 level, bilaterally. The flow volume (Q) was calculated. (Q=time averaged mean velocity x cross sectional area of vessel) A lower Flow velocity and smaller vessel diameter were measured on the right side compared to those of the left side, resulting in a lower flow volume. The calculated flow volumes using the equation were 77.0 +- 39.7 ml/min for the right side and 127.6 +- 71.0 ml/min for the left side (p=0.0001) while the net vertebral artery flow volume was 204.6 +- 81.8 ml/min. Decrease in the vertebral artery flow volume was statistically significant with advanced age. (r=-0.36, p=0.032). Vertebral artery blood flow volume was 191.20 +- 59.19 ml/min in male, and 217.28 +- 98.67 ml/min in female (p=0.6). The normal range for the net vertebral artery flow volume defined by the 5th to 95th percentiles was between 110.06 and 364.1 ml/min. The normal range for the net vertebral artery flow volume was between 110.06 and 364.1 ml/min. Vertebral artery flow volume decreased with the increase of age. However, gender did not affect the blood flow volume.

  15. Quantification of mitral valve regurgitation with color flow Doppler using baseline shift.

    Science.gov (United States)

    Heß, Hannah; Eibel, Sarah; Mukherjee, Chirojit; Kaisers, Udo X; Ender, Joerg

    2013-02-01

    Vena contracta width (VCW) and effective regurgitant orifice area (EROA) are well established methods for evaluating mitral regurgitation using transesophageal echocardiography (TEE). For color-flow Doppler (CF) measurements Nyquist limit of 50-60 cm/s is recommended. Aim of the study was to investigate the effectiveness of a baseline shift of the Nyquist limit for these measurements. After a comprehensive 2-dimensional (2D) TEE examination, the mitral regurgitation jet was acquired with a Nyquist limit of 50 cm/s (NL50) along with a baseline shift to 37.5 cm/s (NL37.5) using CF. Moreover a real time 3-dimensional (RT 3D) color complete volume dataset was stored with a Nyquist limit of 50 cm/s (NL50) and 37.5 cm/s (NL37.5). Vena contracta width (VCW) as well as proximal isovelocity surface area (PISA) derived EROA were measured based on 2D TEE and compared to RT 3D echo measurements for vena contracta area (VCA) using planimetry method. Correlation between VCA 3D NL50 and VCW NL50 was 0.29 (p < 0.05) compared to 0.6 (p < 0.05) using NL37.5. Correlation between VCA 3D NL50 and EROA 2D NL50 was 0.46 (p < 0.05) vs. 0.6 (p < 0.05) EROA 2D NL37.5. Correlation between VCA 3D NL37.5 and VCW NL50 was 0.45 (p < 0.05) compared to 0.65 (p < 0.05) using VCW NL37.5. Correlation between VCA 3D NL37.5 and EROA 2D NL50 was 0.41 (p < 0.05) vs. 0.53 (p < 0.05) using EROA 2D NL37.5. Baseline shift of the NL to 37.5 cm/s improves the correlation for VCW and EROA when compared to RT 3D NL50 planimetry of the vena contracta area. Baseline shift in RT 3D to a NL of 37.5 cm/s shows similar results like NL50.

  16. SAR Processing Based On Two-Dimensional Transfer Function

    Science.gov (United States)

    Chang, Chi-Yung; Jin, Michael Y.; Curlander, John C.

    1994-01-01

    Exact transfer function, ETF, is two-dimensional transfer function that constitutes basis of improved frequency-domain-convolution algorithm for processing synthetic-aperture-radar, SAR data. ETF incorporates terms that account for Doppler effect of motion of radar relative to scanned ground area and for antenna squint angle. Algorithm based on ETF outperforms others.

  17. Absence of Doppler signal in transcranial color-coded ultrasonography may be confirmatory for brain death: A case report

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    Mehmet Akif Topçuoğlu

    2015-08-01

    Full Text Available Transcranial Doppler ultrasonography (TCD is a valuable tool for demonstrating cerebral circulatory arrest (CCA in the setting of brain death. Complete reversal of diastolic flow (to-and-fro flow and systolic spikes in bilateral terminal internal carotid arteries and vertebrobasilar circulation are considered as specific sonogram configurations supporting the diagnosis of CCA. Because of the possibility of sonic bone window impermeability, absence of any waveform in TCD is not confirmatory for CCA unless there is documentation of disappearance of a previously well detected signal by the same recording settings. Transcranial color-coded sonography (TCCS with B-mode imaging can reliably detect adequacy of bone windows with clarity contralateral skull and ipsilateral planum temporale visualization. Therefore, absence of detectable intracranial Doppler signal along with available ultrasound window in TCCS can confirm clinical diagnosis of brain death. We herein discuss this entity from the frame of a representative case.

  18. Color Doppler evaluation of the ocular arterial flow changes in chronic obstructive pulmonary disease

    Energy Technology Data Exchange (ETDEWEB)

    Ozer, Tulay [Department of Radiology, Karaelmas University, School of Medicine, Tip Fakueltesi, Radyoloji AD, 67600-Kozlu, Zonguldak (Turkey)]. E-mail: ozertulay@yahoo.com; Altin, Remzi [Department of Pulmonary Medicine, Karaelmas University, School of Medicine, Kozlu, Zonguldak (Turkey); Ugurbas, Suat Hayri [Department of Ophthalmology, Karaelmas University, School of Medicine, Kozlu, Zonguldak (Turkey); Ozer, Yetkin [Department of Anesthesiology and Reanimation, Karaelmas University, School of Medicine, Kozlu, Zonguldak (Turkey); Mahmutyazicioglu, Kamran [Department of Radiology, Karaelmas University, School of Medicine, Tip Fakueltesi, Radyoloji AD, 67600-Kozlu, Zonguldak (Turkey); Kart, Levent [Department of Pulmonary Medicine, Karaelmas University, School of Medicine, Kozlu, Zonguldak (Turkey)

    2006-01-15

    Purpose: To evaluate the hemodynamic changes in the extraocular orbital vessels of the patients with chronic obstructive pulmonary disease (COPD), using color Doppler ultrasonography (CDU) technique, and to compare the results with those of healthy control subjects. Methods: Forty-five patients with COPD and 17 healthy control subjects were included in this study. Patients with COPD were classified according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD). Fifteen patients of stage I COPD (mild airflow limitation), stage II COPD (worsening airflow limitation) or stage III COPD (severe airflow limitation) were enrolled into Group I, II and III, respectively. End tidal carbon dioxide (EtCO{sub 2}), peripheral oxygen saturation (SpO{sub 2}), pulse rate (PR) and respiratory rate (RR) were measured by using capnograph/pulse oximeter in all patients. Measurements were performed in only one randomly chosen eye of each participant. The peak systolic velocity (PSV), end-diastolic velocity (EDV), and resistance index (RI) were measured in the ophthalmic artery (OA), central retinal artery (CRA), lateral short posterior ciliary artery (LPCA) and medial short posterior ciliary artery (MPCA), using CDU technique. Results: The PSV measurements of the OA were significantly higher in Groups II and III compared to control group (p < 0.01, p < 0.001, respectively). The RI values from OA and CRA were significantly higher in Group II and III than the control group (p < 0.05). The RI values of LPCA and MPCA were also significantly higher in Group II than the control subjects (p < 0.05). When RI values were compared, mean values of LPCA and MPCA were significantly lower in Group III than in Group II (p < 0.05). There were no significant differences between Group I and control patients about PSVs, EDVs and RI values of all arteries Statistically significant correlations were found for the EtCO{sub 2} with PSV (r = 0.53, p < 0.01) and EDV (r = 0.51, p < 0.01) of the

  19. Usefulness of combination of grey-scale and color Doppler ultrasound findings in the diagnosis of ulnar nerve entrapment syndrome

    Directory of Open Access Journals (Sweden)

    Mohammad Ebrahim Ghanei

    2015-01-01

    Full Text Available Background: Ulnar nerve entrapment (UNE has been diagnosed with clinical examination and electrodiagnostic studies. This study was designed to determine the value of a combination of grey-scale and color Doppler ultrasound findings in the diagnosis of patients with UNE. Materials and Methods: During May to August 2013 41 patients with UNE (proven by electrodiagnostic studies and 44 healthy volunteers were evaluated by ultrasound study. Three cross-sectional area (CSA of ulnar nerve around cubital fossa was determined and measured in both groups. The maximum and minimum diameter of ulnar nerve was measured for calculating flattening ratio index (FRI. Vascularity of ulnar nerve around cubital fossa was also examined in proper color Doppler setting. Results: The mean CSA of nerve at all proximal, middle and distal levels were greater in patients with UNE than in controls (P = 0.02, <0.001 and 0.34 respectively. A cut-off point of 10.5 mm 2 for CSA (in the level of the cubital fossa yielded a sensitivity and specificity of 92.7% and 93.2%, respectively. Mean FRI was 3.1 ± 0.6 in patients with UNE group and 1.4 ± 0.2 in the control group with a significant difference (P < 0.001. FRI with cutoff point 2.15 has been shown as an important parameter for the detection of UNE. The vascularity in UNE has a sensitivity and specificity of 66% and 93.2%, respectively, and has a higher probability of being positive in severe UNE. Conclusion: Combination of grey-scale and color Doppler ultrasound may provide valuable diagnostic criteria and severity assessment of UNE.

  20. The application of color Doppler flow imaging in the diagnosis and therapeutic effect evaluation of erectile dysfunction

    Directory of Open Access Journals (Sweden)

    Xu-Jun Xuan

    2016-01-01

    Full Text Available We aim to investigate the correlations between hemodynamic parameters, penile rigidity grading, and the therapeutic effects of phosphodiesterase type 5 inhibitors using color Doppler flow imaging after intracavernosal injection in patients with erectile dysfunction. This study involved 164 patients. After intracavernosal injection with a mixture of papaverine (60 mg, prostaglandin E 1 (10 mg, and lidocaine (2%, 0.5-1 ml, the penile vessels were assessed using color Doppler flow imaging. Penile rigidity was classified based on the Erection Hardness Score system as Grades 4, 3, 2 or 1 (corresponding to Schramek Grades V to II. Then, the patients were given oral sildenafil (50-100 mg and scored according to the International Index of Erectile Function (IIEF-5 questionnaire. The number of patients with penile rigidities of Schramek Grades II to V was 14, 18, 21, and 111, respectively. The IIEF-5 score was positively correlated with the refilling index of the penile cavernosal artery (r = 0.79, P< 0.05, the peak systolic velocity (r = 0.45, P< 0.05, and penile rigidity (r = 0.75, P< 0.05, and was negatively correlated with the end diastolic velocity (r = −0.74, P< 0.05. For patients with erectile dysfunction, both the IIEF-5 score after sildenafil administration, which is correlated with penile rigidity, and the hemodynamic parameters detected using color Doppler flow imaging may predict the effects of phosphodiesterase type 5 inhibitor treatment and could provide a reasonable model for the targeted-treatment of erectile dysfunction.

  1. Value of color Doppler ultrasound in diagnosis of portal hypertension liver cirrhosis merged with esophageal variceal bleeding

    Institute of Scientific and Technical Information of China (English)

    Hai-Rong Yang

    2016-01-01

    Objective:To explore the value of color Doppler ultrasound in the diagnosis of portal hypertension liver cirrhosis merged with esophageal variceal bleeding.Methods:The clinical materials of 30 patients with portal hypertension liver cirrhosis merged with esophageal varices who were admitted in our hospital from August, 2014 to August, 2015 were retrospectively analyzed. According to whether there was a history of hematemesis and melena or not before and 3 months after ultrasound examination, and whether was esophageal variceal bleeding or not confirming by the electronic gastroscopy, the patients were divided into the bleeding group (17 cases) and non-bleeding group (13 cases). The color Doppler ultrasonic diagnosis apparatus was used to detect the inner diameter and blood flow rate of splenic vein, portal vein, and left gastric vein. The blood flow volume of splenic vein, portal vein, and left gastric vein was calculated.Results:The inner diameter and blood flow volume of splenic vein in the bleeding group were significantly higher than those in the non-bleeding group, but the blood flow rate was significantly lower than that in the non-bleeding group (P0.05). The inner diameter of left gastric vein in the bleeding group was significantly higher than that in the non-bleeding group, but the blood flow rate was significantly lower that that in the non-bleeding group (P0.05).Conclusions:Color Doppler ultrasound can detect the inner diameter of splenic vein, portal vein, and left gastric vein, and the related hemodynamic indicators, particularly, the inner diameter, blood flow rate, and blood flow volume of splenic vein are effective in predicting the risk of esophageal variceal bleeding.

  2. Diagnostic impact of color Doppler ultrasound-guided core biopsy on fine-needle aspiration of anterior mediastinal masses.

    Science.gov (United States)

    Chen, Hung-Jen; Liao, Wei-Chih; Liang, Shinn-Jye; Li, Chia-Hsiang; Tu, Chih-Yen; Hsu, Wu-Huei

    2014-12-01

    Although lymphoma and thymoma are common etiologies of anterior mediastinal masses (AMMs), smaller percentages and numbers of patients with these diseases have been enrolled in previous ultrasound-guided biopsy studies. To date, there has been no study of color Doppler sonographic features to support the differentiation of AMMs. For this retrospective cohort study, a search of the database of the China Medical University Hospital using the clinical coding "ultrasound-guided biopsy" was conducted for the period December 2003 to February 2013. We selected patients diagnosed with AMMs (not cysts) using radiographic records. This search yielded a list of 80 cases. Real-time ultrasound-guided core needle biopsy (CNB) was performed in all but 5 patients without a sufficient safety range. In 89% (67/75) of these ultrasound-guided CNB cases, the diagnostic accuracy achieved subclassification. Fine-needle aspiration cytology achieved subclassification in only 10% of cases. On color Doppler sonography, 71% of lymphomas were characterized as "rich vascular with central/crisscross collocations" and 29% as "avascular or localized/scattered peripheral vessels." However, decreased proportions of "rich vascular with central/crisscross collocations" were found in lung cancer (4% [1/23], odds ratio = 0.018, 95% confidence interval: 0.002-0.154, p Fine-needle aspiration cytology itself cannot aid in the diagnosis. Color Doppler sonographic evaluation of AMMs followed by real-time CNB is a more efficient method. Copyright © 2014 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved.

  3. Two-dimensional liquid chromatography

    DEFF Research Database (Denmark)

    Græsbøll, Rune

    of this thesis is on online comprehensive two-dimensional liquid chromatography (online LC×LC) with reverse phase in both dimensions (online RP×RP). Since online RP×RP has not been attempted before within this research group, a significant part of this thesis consists of knowledge and experience gained...

  4. Value of tissue Doppler-derived Tei index and two-dimensional speckle tracking imaging derived longitudinal strain on predicting outcome of patients with light-chain cardiac amyloidosis.

    Science.gov (United States)

    Liu, Dan; Hu, Kai; Herrmann, Sebastian; Cikes, Maja; Ertl, Georg; Weidemann, Frank; Störk, Stefan; Nordbeck, Peter

    2017-06-01

    Prognosis of patients with light-chain cardiac amyloidosis (AL-CA) is poor. Speckle tracking imaging (STI) derived longitudinal deformation parameters and Doppler-derived left ventricular (LV) Tei index are valuable predictors of outcome in patients with AL-CA. We estimated the prognostic utility of Tei index and deformation parameters in 58 comprehensively phenotyped patients with AL-CA after a median follow-up of 365 days (quartiles 121, 365 days). The primary end point was all-cause mortality. 19 (33%) patients died during follow-up. Tei index (0.89 ± 0.29 vs. 0.61 ± 0.16, p < 0.001) and E to global early diastolic strain rate ratio (E/GLSRdias) were higher while global longitudinal systolic strain (GLSsys) was lower in non-survivors than in survivors (all p < 0.05). Tei index, NYHA functional class, GLSsys and E/GLSRdias were independent predictors of all-cause mortality risk, and Tei index ≥0.9 (HR 7.01, 95% CI 2.43-20.21, p < 0.001) was the best predictor of poor outcome. Combining Tei index and GLSsys yielded the best results on predicting death within 1 year (100% with Tei index ≥0.9 and GLSsys ≤13%) or survival (95% with Tei index ≤0.9 and GLSsys ≥13%). We conclude that 1-year mortality risk in AL-CA patients can be reliably predicted using Tei index or deformation parameters, with combined analysis offering best performance.

  5. Contribution of spiral artery blood flow changes assessed by transvaginal color Doppler sonography for predicting endometrial pathologies

    Directory of Open Access Journals (Sweden)

    Suna Kabil Kucur

    2013-01-01

    Full Text Available ive: To investigate the diagnostic value of blood flow measurements in spiral artery by transvaginal color Doppler sonography (CDS in predicting endometrial pathologies.Methods: Ninety-seven patients presenting with abnormal uterine bleeding and requiring endometrial assessment were included in this prospective observational study. Endometrial thickness, structure and echogenicity were recorded. Pulsatility index (PI and resistive index (RI of the spiral artery were measured by transvaginal CDS. Endometrial sampling was performed for all subjects. Sonographic and hystopathologic findings were compared.Results: The histopathological diagnoses were as follows; 39 cases (40.2% endometrial polyp, 9 cases (9.3% endometrial hyperplasia, 10 cases (10.3 submucous myoma, 7 cases (7.2% endometrium cancer, and 32 cases (33% nonspecific findings. The spiral artery PI in endometrium cancer group was highly significantly lower than other groups (p<0.01. The spiral artery RI was also significantly lower in the patients with malignant histology (p<0.05. Conclusion: Endometrial pathologies are associated significantly with endometrial spiral artery Doppler changes.Key words: Spiral artery, Doppler ultrasonography, endometrium

  6. 乳腺增生病的彩色多普勒超声诊断与病理对照分析%Galactophore hyperplasia:a comparative analysis between color doppler flow imaging and pathology

    Institute of Scientific and Technical Information of China (English)

    韩曼彤; 陈念德; 冼兆新

    2001-01-01

    Objective:To evaluate the value of two-dimensional sonogram andcolor Doppler Flow Imaging(CDFI) in diagnosing galactophore hyperplasia(PH).Methods:A retrospective analysis of the two dimensional sonogram and CDFI features was conducted to 40 cases of galactophore hyperplasis confirmed by patholgy,and the results were compared to the findings of pathology.Results:The correct rate of ultrasound diagnosis was 80%.The sonograms of PH could be divided into three types in accordance with pathological morphology which are simple hyperplasis, cystic hyperplasia and adenoidal hyperplasia.In 10% cases of PH,color signal could be detected.Conclusion:Two-dimensional sonogram,together with CDFI,has shown some clinical significance to the diagnosis of PH.%目的:探讨二维声像图及CDFI对乳腺增生病的诊断价值。方法:对40例经手术病理或病理活检证实为乳腺增生病的二维声像图及CDFI表现进行了分析,并与病理分型作对照。结果:本文的超声诊断正确率为80%。按其病理分为单纯性增生,囊性增生,腺型增生三种。此病血流信号检出率为10%(4/40)。结论:二维声像图加CDFI诊断本病符合率高,是有一定的临床价值。

  7. Color Doppler-ultrasonography in oral squamous cell carcinoma: Making ultrasonography more meaningful

    Directory of Open Access Journals (Sweden)

    Rahul Gandhi

    2016-01-01

    Conclusions: The said Doppler indices were shown to be sensitive as well as specific for the diagnosis of malignant oral tumors. Although CD-USG cannot replace histopathological procedures, it plays a definite role as an adjunct to the clinical evaluation of OSCC cases.

  8. Comparison of fetal middle cerebral arteries, umbilical and uterin artery color Doppler ultrasound with blood gas analysis in pregnancy complicated by IUGR.

    Science.gov (United States)

    Fardiazar, Zahra; Atashkhouei, Simin; Yosefzad, Yousef; Goldust, Mohamad; Torab, Reza

    2013-01-01

    Fetal color Doppler is important for evaluation of hypoxia in intrauterine growth restriction (IUGR) fetus. In this study we compare fetal and maternal color Doppler with blood gas analysis to detect fetal acidosis. In this cross-sectional study we evaluated 100 hospitalized patients with IUGR for comparison of color Doppler results with arterial blood gas analysis. RESULTS of Doppler sonography of fetus middle cerebral arteries, umbilical and uterine artery and umbilical artery ABG were studied in these neonates. Mean maternal age was 28±7 years, mean gestational age was 31.79±2.59 weeks and mean growth restriction was 3±2 weeks. Resistance increasing was observed in right uterine arteries of 37 mothers. It was normal in 60 mothers. Resistance increasing was observed in left uterine arteries of 36 mothers and nuch was seen in four cases. PCO2, PO2, and pH mean were 48.41±9.50 mmHg, 26.00±12.34 mmHg, and 7.28±0.10 in the neonates respectively. In this study abnormal color Doppler in IUGR fetuses have no significant correlation with umbilical cord blood gas.

  9. Two dimensional unstable scar statistics.

    Energy Technology Data Exchange (ETDEWEB)

    Warne, Larry Kevin; Jorgenson, Roy Eberhardt; Kotulski, Joseph Daniel; Lee, Kelvin S. H. (ITT Industries/AES Los Angeles, CA)

    2006-12-01

    This report examines the localization of time harmonic high frequency modal fields in two dimensional cavities along periodic paths between opposing sides of the cavity. The cases where these orbits lead to unstable localized modes are known as scars. This paper examines the enhancements for these unstable orbits when the opposing mirrors are both convex and concave. In the latter case the construction includes the treatment of interior foci.

  10. Two-Dimensional Vernier Scale

    Science.gov (United States)

    Juday, Richard D.

    1992-01-01

    Modified vernier scale gives accurate two-dimensional coordinates from maps, drawings, or cathode-ray-tube displays. Movable circular overlay rests on fixed rectangular-grid overlay. Pitch of circles nine-tenths that of grid and, for greatest accuracy, radii of circles large compared with pitch of grid. Scale enables user to interpolate between finest divisions of regularly spaced rule simply by observing which mark on auxiliary vernier rule aligns with mark on primary rule.

  11. 彩色多普勒超声在新生儿先天性心脏病诊断中的应用%Application of color doppler ultrasound in diagnosis of congenital heart disease

    Institute of Scientific and Technical Information of China (English)

    王刚强

    2011-01-01

    目的 探讨彩色多普勒超声诊断新生儿先天性心脏病的应用.方法 对有心脏杂音、胸片提示心影增大以及不明原因发绀等可疑先天性心脏病病例予彩色多普勒超声心动图检查,利用彩色多普勒血流显像仪,观察心脏各切面结构和彩色血流特征.结果 先天性心脏病中房间隔缺损45例(占50.56%),动脉导管未闭26例,室间隔缺损11例,三尖瓣下移畸形1例,心内膜垫缺损2例,先天性肺动脉扩张1例.结论 新生儿先天性心脏病的诊断主要依据是超声二维图及彩色多普勒血流图,新生儿的先心病中以房间隔缺损最常见.%Objective To explore the application of color doppler ultrasound diagnosis of congenital heart disease . Methods Using color Doppler flow imaging instrument to observe the heart of the section structure and color flow characteristics. Results Atrial septal defect with congenital heart disease in 45 cases (accounting for 50. 56% ), 26 cases of patent ductus arteriosus, ventricular septal defect in 11 cases, 1 case of Ebstein malformation, 2 cases of endocardial cushion defect, congenital pulmonary expansion 1 case. Conclusions The diagnosis of congenital heart disease is based on two - dimensional ultrasound and Color Doppler flow imaging, in congenital heart disease of the newborn the most common case is atrial septal defect.

  12. Value of serum β-HCG, P, CA125, and color Doppler ultrasound in early diagnosis of ectopic pregnancy

    Institute of Scientific and Technical Information of China (English)

    Yan-Li Liu

    2016-01-01

    Objective:To explore the clinical value of serum β-HCG, P, CA125, and color Doppler ultrasound in the early diagnosis of ectopic pregnancy (EP). Methods:A total of 50 patients with EP who were admitted in our hospital from September, 2014 to September, 2015 were included in the study and served as the observation group, while 50 normal pregnant women were served as the control group. A volume of 5 mL of fasting elbow venous blood the day on admission in the two groups was extracted, and then was centrifuged for serum. The chemiluminescence immunoassay was used to detect the levels of serum β-HCG, P, and CA125. After 48h,β-HCG level was detected again. The vaginal color Doppler diasonograph was used to detect the changes of RI and PSV. The blood supply of LH was observed. Results:The levels of serumβ-HCG, P, and CA125 in the observation group were significantly lower than those in the control group (P<0.05). When β-HCG<2 000 IU/L, after 48 h, β-HCG level was doubled in 3 cases (6.0%) in the observation group, while in 49 cases (98.0%) in the control group, and the differences between the two groups were not statistically significant (P<0.05). RI in the observation group was significantly higher than that in the control group, while PSV was significantly lower than that in the control group (P<0.05). Blood supply in the observation group was in a half ring shape, accounting for 58.0%;in the control group was in a ring shape, accounting for 70.0%, and the difference was statistically significant (P<0.05). Conclusions:Determination of the levels of serumβ-HCG, P, and CA125 in the pregnant women, in combined with the vaginal color Doppler ultrasound detection of RI and PSV, can contribute to distinguish the normal intrauterine pregnancy with EP and prevent the misdiagnosis, which can provide an accurate reference value for the early diagnosis and timely treatment of EP, and can be used as an ideal method for the diagnosis of EP.

  13. 四维彩超在胎儿先天性畸形中的临床诊断价值%Four-dimensional color Doppler ultrasound in examination in prenatal screening of fetal malformation

    Institute of Scientific and Technical Information of China (English)

    罗妙云

    2014-01-01

    目的 探讨四维彩超在胎儿先天性畸形中的诊断价值.方法 随机观察我院2012年1月至2014年1月孕中晚期孕妇1200例产前常规超声检查结果,所有孕妇均进行了二维超声和四维超声检查,并随访至产后1个月,比较二维超声和四维超声诊断胎儿先天性畸形的准确性.结果 经产后临床证实,共发现先天性胎儿畸形34例,其中神经管畸形10例,心脏畸形8例,唇腭裂7例,泌尿系畸形3例,四肢畸形3例,腹部畸形1例,其他2例.四维超声检出畸形31例,与产后符合率91.17%;漏诊3例,其中多指畸形1例,脊柱裂2例.二维超声检出畸形26例,符合率76.47%;漏诊8例,其中唇腭裂2例,多指畸形2例,脊柱裂3例,足内翻1例.二维和四维超声的诊断符合率比较差异具有统计学意义(P<0.05).结论 四维超声更能多方位、多切面观察胎儿宫内发育情况,对诊断胎儿体表畸形具有更直观和准确的判断,具有较高的临床价值.%Objective To investigate the diagnostic value of four-dimensional (4D) color Doppler ultrasound examination in prenatal screening of fetal malformation.Methods 1200 pregnant women were observed and detected by four-dimensional color Doppler and two dimensional ultrasound.The results were compared with the results confirmed by clinical pathology.Results 34 cases were detected with congenital defects; among which,10 got defects in nervous system,8 heart deformity,7 cheilopalatognathus,3 urinary tract malformation,3 limb deformity,1 abdominal deformity,and the other 2 cases.31 cases were detected with deformity by four-dimensional color Doppler,with a postpartum coincidence rate of 91.17%; and 3 cases were misdiagnosed,of which 1 case had polydactyly deformity and 2 cases spina bifida.26 cases were detected with deformity by two-dimensional ultrasony,with a postpartum coincidence rate of 76.47%; and 8 cases were misdiagnosed,of which 2 cases had cleft lip and palate,2 case polydactyly

  14. Two-dimensional liquid chromatography

    DEFF Research Database (Denmark)

    Græsbøll, Rune

    Two-dimensional liquid chromatography has received increasing interest due to the rise in demand for analysis of complex chemical mixtures. Separation of complex mixtures is hard to achieve as a simple consequence of the sheer number of analytes, as these samples might contain hundreds or even...... dimensions. As a consequence of the conclusions made within this thesis, the research group has, for the time being, decided against further development of online LC×LC systems, since it was not deemed ideal for the intended application, the analysis of the polar fraction of oil. Trap-and...

  15. Diagnostic value of color doppler ultrasonography in detecting stenosis and occlusion of central veins in patients with chronic kidney disease

    Directory of Open Access Journals (Sweden)

    Masoud Pezeshki Rad

    2015-01-01

    Full Text Available Venography is an invasive diagnostic test that uses contrast material that provides a picture of the condition of the veins. But, complications, including adverse effects on the kidney, do occur. On the other hand, with the current technological development, application of ultrasound in the diagnosis of obstructive diseases of the veins is gaining popularity, being non-invasive, easy to perform and cost-effective. The aim of this study was to evaluate the diagnostic value of Doppler sonography in the diagnosis of central vein stenosis. In this descriptive-analytical study, 41 hemodialysis patients who had been referred for 50 upper limb venographies to the radiology department of Imam Reza (AS were included. Patients with chronic kidney disease with a history of catheterization of the vein, jugular or subclavian, and who had established fistulas or synthetic vascular grafts were targeted. Central venous ultrasound was performed on both sides to evaluate stenosis or occlusion. Venography was performed by the radiologist the next day or the day before hemodialysis. Data on demographic characteristics, findings of clinical examination and findings of ultrasound as well as venography were recorded by using the SPSS software, Chi-square test and Spearman correlation, and Kappa agreement was calculated for sensitivity, specificity and predictive values. Twenty-three (56% patients were male subjects and 18 patients (44% were female. Twenty-three (56% patients of the study population were aged 60 years. The overall sensitivity, specificity and positive predictive value and negative predictive value of Doppler sonography in the proximal veins in hemodialysis patients compared with venography were, respectively, 80.9%, 79.3%, 73.9% and 85.1%. Color Doppler sonography, as a non-invasive method, could be a good alternative for venography in the assessment of the upper limb with central vein stenosis and occlusion.

  16. Diagnostic value of color doppler ultrasonography in detecting stenosis and occlusion of central veins in patients with chronic kidney disease.

    Science.gov (United States)

    Rad, Masoud Pezeshki; Kazemzadeh, Gholam Hosain; Ziaee, Masood; Azarkar, Ghodsieh

    2015-03-01

    Venography is an invasive diagnostic test that uses contrast material that provides a picture of the condition of the veins. But, complications, including adverse effects on the kidney, do occur. On the other hand, with the current technological development, application of ultrasound in the diagnosis of obstructive diseases of the veins is gaining popularity, being non-invasive, easy to perform and cost-effective. The aim of this study was to evaluate the diagnostic value of Doppler sonography in the diagnosis of central vein stenosis. In this descriptive-analytical study, 41 hemodialysis patients who had been referred for 50 upper limb venographies to the radiology department of Imam Reza (AS) were included. Patients with chronic kidney disease with a history of catheterization of the vein, jugular or subclavian, and who had established fistulas or synthetic vascular grafts were targeted. Central venous ultrasound was performed on both sides to evaluate stenosis or occlusion. Venography was performed by the radiologist the next day or the day before hemodialysis. Data on demographic characteristics, findings of clinical examination and findings of ultrasound as well as venography were recorded by using the SPSS software, Chi-square test and Spearman correlation, and Kappa agreement was calculated for sensitivity, specificity and predictive values. Twenty-three (56%) patients were male subjects and 18 patients (44%) were female. Twenty-three (56%) patients of the study population were aged 60 years. The overall sensitivity, specificity and positive predictive value and negative predictive value of Doppler sonography in the proximal veins in hemodialysis patients compared with venography were, respectively, 80.9%, 79.3%, 73.9% and 85.1%. Color Doppler sonography, as a non-invasive method, could be a good alternative for venography in the assessment of the upper limb with central vein stenosis and occlusion.

  17. High-flow-velocity and shear-rate imaging by use of color Doppler optical coherence tomography.

    Science.gov (United States)

    van Leeuwen, T G; Kulkarni, M D; Yazdanfar, S; Rollins, A M; Izatt, J A

    1999-11-15

    Color Doppler optical coherence tomography (CDOCT) is capable of precise velocity mapping in turbid media. Previous CDOCT systems based on the short-time Fourier transform have been limited to maximum flow velocities of the order of tens of millimeters per second. We describe a technique, based on interference signal demodulation at multiple frequencies, to extend the physiological relevance of CDOCT by increasing the dynamic range of measurable velocities to hundreds of millimeters per second. The physiologically important parameter of shear rate is also derived from CDOCT measurements. The measured flow-velocity profiles and shear-rate distributions correlate very well with theoretical predictions. The multiple demodulation technique, therefore, may be useful to monitor blood flow in vivo and to identify regions with high and low shear rates.

  18. Ultrahigh-velocity resolution imaging of the microcirculation in-vivo using color Doppler optical coherence tomography

    Science.gov (United States)

    Yazdanfar, Siavash; Rollins, Andrew M.; Izatt, Joseph A.

    2001-05-01

    Color Doppler optical coherence tomography (CDOCT) is a method for noninvasive cross-sectional imaging of blood flow in vivo. In previous implementations, velocity estimates were obtained by measuring the frequency shift of discrete depth-resolved backscatter spectra, resulting in a velocity resolution on the order of 1 mm/s. We present a novel processing method that detects Doppler shifts calculated across sequential axial scans, enabling ultrahigh velocity resolution (~1 micron/s) flow measurement in scattering media. This method of sequential scan processing was calibrated with a moving mirror mounted on a precision motorized translator. Latex microspheres suspended in deuterium oxide were used as a highly scattering test phantom. Laminar flow profiles down to ~15 micron/s centerline velocity (0.02 cc/hr) were observed with a sensitivity of 1.2 micron/s. Finally, vessels on the order of 10 microns in diameter were imaged in living human skin, with a relative frequency sensitivity less than 4 x 10-5. To our knowledge, these results are the lowest velocities ever measured with CDOCT.

  19. Two-dimensional capillary origami

    Energy Technology Data Exchange (ETDEWEB)

    Brubaker, N.D., E-mail: nbrubaker@math.arizona.edu; Lega, J., E-mail: lega@math.arizona.edu

    2016-01-08

    We describe a global approach to the problem of capillary origami that captures all unfolded equilibrium configurations in the two-dimensional setting where the drop is not required to fully wet the flexible plate. We provide bifurcation diagrams showing the level of encapsulation of each equilibrium configuration as a function of the volume of liquid that it contains, as well as plots representing the energy of each equilibrium branch. These diagrams indicate at what volume level the liquid drop ceases to be attached to the endpoints of the plate, which depends on the value of the contact angle. As in the case of pinned contact points, three different parameter regimes are identified, one of which predicts instantaneous encapsulation for small initial volumes of liquid. - Highlights: • Full solution set of the two-dimensional capillary origami problem. • Fluid does not necessarily wet the entire plate. • Global energy approach provides exact differential equations satisfied by minimizers. • Bifurcation diagrams highlight three different regimes. • Conditions for spontaneous encapsulation are identified.

  20. Comparison of color-Doppler and qualitative and quantitative strain-elastography for differentiation of thyroid nodules in daily practice.

    Science.gov (United States)

    Götzberger, Manuela; Krueger, Susanne; Gärtner, Roland; Reincke, Martin; Pichler, Matthias; Assmann, Gerald; Mussack, Thomas; Zimmermann, Michael; Gülberg, Veit

    2016-04-01

    Strain-elastography provides a new ultrasound-based method that can offer information about the stiffness of thyroid nodules as an indicator of malignancy. The aim of our study was to compare the utility of color-Doppler and strain-elastography in differentiating between benign and malignant nodules. 77 thyroid nodules (70 benign and 7 malignant) from 70 unselected patients (48 female/22 male, mean age 49.7±14.3 years) were evaluated with color-Doppler and elastography based on a five-scale elastogram score for qualitative elastography and strain ratio for quantitative elastography. As reference tissue we chose normal thyroid tissue [strain ratio a (SR a)] and cervical muscles [strain ratio b (SR b)]. The cytological or histological results were used as a reference standard. Diagnostic performances of qualitative and quantitative elastography were compared using ROC curves. Vascularization score 3 or 4 was associated with malignancy (p=0.024) as well as elastogram score 4 or 5 (p=0.070, n.s.s.). SR a was indicatively higher and SR b lower in the group of malignant nodules (p=0.065 and p=0.246, n.s.s.). The best cut-off points predicting malignancy were 3.32 for SR a (66.7% sensitivity, 83.3% specificity) and 0.10 for SR b (71.4% sensitivity, 67.1% specificity). In our study, the accuracy of elastography did not surpass other sonographic parameters in differentiating thyroid nodules. The technique can play a role as a supplementary parameter in assessment of malignancy to improve diagnostic efficacy. The best parameter is SR a, but SR b can serve as an alternative if SR a is not assessable.

  1. [Color Doppler monitoring the utero-placental-fetal circulation variety of normal pregnancy and intrauterine growth retardation].

    Science.gov (United States)

    Xu, J; Wen, L; Ma, T

    1998-04-01

    To study the utero-placental-fetal circulation (UPFC) in normal pregnancy and intrauterine growth retardation (IUGR) cases. Color doppler ultrasound was used to detect UPFC in 150 second and third trimester pregnant women, of which 89 cases were normal pregnancy and 58 cases were IUGR. 3 cases were IUGR with chronic renal failure. Hemodynamical value of the umbilical artery (UmA), umbilical vein (UmV) and uterine artery (UtA) were examined directly. The indices included time average velocity (TAV), pulsatility index (PI), resistance index (RI), systolic/diastolic (S/D) ratio, blood flow volume (Q). The maternal serum estriol (E3), human placental lactogen (HPL) and plasma thromboxane B2 (TXB2)/6-keto-PGF1 alpha (6-KP) were measured simultaneously. The result shows that in normal pregnancy group UPFC is abundant gradually with increasing gestational age. In IUGR group 92.53% of cases showed that TAV and Q of UmA, UmV markedly decreased and PI, RI and S/D ratio of UmA elevated at 20 weeks of gestation. There were significant difference between the two groups, maternal serum E3, HPL level in IUGR group were significantly lower than that of the normal pregnancy group, 6-KP level reduced, and TXB2/6-KP ratio significantly increased. Using color doppler ultrasound examining hemodynamical changes of UmA, UmV and UtA could observe UPFC function directly. It is one of the best method to early diagnose and predict the prognosis of IUGR.

  2. Lower limbs valvular insufficiency diagnosed by color-doppler US: variability in the results using the standing or semi-Fowler position and Valsalva maneuver or distal compression

    Directory of Open Access Journals (Sweden)

    Federico Guillermo Lubinus Badillo

    2007-05-01

    Full Text Available Objectives: To determine differences in diagnosis of valvular insufficiency by color doppler ultrasonography in standing or semi-Fowler position and Valsalva maneuver or distal compression. Methodology:98 patients with 1-3 degreee valvular insufficiency were studiedAll of thew were evaluated by doppler ultrasonography in boothpositions and maneuvers. Results: There were differences betweenthe different techniques. In upper segments, a higher frequency of reflux was found with semi-Fowler plus Valsalva´s maneuver; in intermediate segments there were similar reflux prevalences using both positions; and, in lower segments, there was more reflux using standing position plus Valsalva´s maneuver. Conclusion. Depending on the venous group to evaluate, it is necessary to adapt the evaluation technique used with Doppler ultrasound color test.

  3. Value of systolic pulmonary venous flow reversal and color Doppler jet measurements assessed with transesophageal echocardiography in recognizing severe pure mitral regurgitation

    NARCIS (Netherlands)

    Pieper, EPG; Hellemans, IM; Hamer, HPM; Ravelli, ACJ; Cheriex, EC; Tijssen, JGP; Lie, KI; Visser, CA

    1996-01-01

    We evaluated the value of color and pulsed Doppler transesophageal echocardiographic parameters and of V waves in estimating the severity of mitral regurgitation (MR) in 62 consecutive patients (38 men and 24 women, aged 39 to 80 years) with angiographically proven chronic pure MR (15 grade I/II, 47

  4. [Varicose vein recurrence after surgery of the sapheno-femoral junction: color Doppler ultrasonography study].

    Science.gov (United States)

    Roscitano, Giuseppe; Mirenda, Francesco; Mandolfino, Tommaso; De Caridi, Giovanni; Stilo, Francesco; Benedetto, Filippo; Spinelli, Francesco

    2003-01-01

    The aim of this study was to evaluate the accuracy and sensitivity of colour Doppler ultrasonography for the diagnosis of postoperative recurrent varicose veins in patients submitted to surgical ligation of the saphenofemoral junction with a view to classifying the recurrences according to the causes. We studied 401 lower limbs in the orthostatic position with colour Doppler ultrasonography in 318 patients (64 M and 254 F) presenting postoperative varicose vein recurrence during the follow-up (12-60 months). We evaluated the type of reflux at the inguinal level under the Valsalva manoeuvre and divided them into 5 types. We observed an incomplete crossectomy (type 1) in 23.2% of the cases; an incontinent saphenofemoral junction, intact and in an anatomical site in 12.5% (type 2); a major tributary (double saphena) originating from the common femoral vein near to the crossectomy site in 10.2% (type 3); neovascularization in 9.7% (type 4) and the presence of a number of major tributaries from the veins of the perineal and pudendal region or from the abdominal parietal veins in 44.4% (type 5). In all cases it was possible to note and classify the type of recurrence. Colour Doppler ultrasonography is an accurate, reliable tool for the diagnosis and classification of postoperative varicose vein recurrences in patients submitted to surgical obliteration of the saphenofemoral junction. It is decisive in the preoperative evaluation and follow-up of patients. In our experience, more than one half of the cases of recurrence were not due to an error of surgical technique.

  5. Diagnosis of Pentalogy of Cantrell in the First Trimester Using Transvaginal Sonography and Color Doppler

    Science.gov (United States)

    Türkçapar, Ayşe Figen; Sargın Oruc, Ayla; Öksüzoglu, Aysegül; Danışman, Nuri

    2015-01-01

    We report the prenatal diagnosis of Cantrell syndrome in the first trimester. During a routine transabdominal ultrasonographic examination, a midline supraumbilical abdominal wall defect including herniated liver and ectopia cordis with a large omphalocele containing the intestines and cystic hygroma was incidentally identified at the 12th week of gestation. A transvaginal sonography examination revealed a severe lumbosacral scoliosis in addition to the inability to visualize the abdominal aorta which was indicative of a severe intracardiac defect. The parents opted for pregnancy to be terminated. In this case report, we discuss the complementary role of transvaginal sonography and Doppler imaging in the diagnosis of Cantrell syndrome in early pregnancy. PMID:25802780

  6. Diagnosis of Pentalogy of Cantrell in the First Trimester Using Transvaginal Sonography and Color Doppler

    Directory of Open Access Journals (Sweden)

    Ayşe Figen Türkçapar

    2015-01-01

    Full Text Available We report the prenatal diagnosis of Cantrell syndrome in the first trimester. During a routine transabdominal ultrasonographic examination, a midline supraumbilical abdominal wall defect including herniated liver and ectopia cordis with a large omphalocele containing the intestines and cystic hygroma was incidentally identified at the 12th week of gestation. A transvaginal sonography examination revealed a severe lumbosacral scoliosis in addition to the inability to visualize the abdominal aorta which was indicative of a severe intracardiac defect. The parents opted for pregnancy to be terminated. In this case report, we discuss the complementary role of transvaginal sonography and Doppler imaging in the diagnosis of Cantrell syndrome in early pregnancy.

  7. [Non-puerperal mastitis in real time and color Doppler ultrasound].

    Science.gov (United States)

    Blohmer, J U; Bollmann, R; Chaoui, R; Kürten, A; Lau, H U

    1994-03-01

    Differential diagnosis distinguishing between nonpuerperal mastitis and inflammatory cancer of the breast is difficult, the conventional method being mammography. In our study, we present the typical findings gained by sonography of 16 patients with nonpuerperal mastitis. They do not differ significantly from those cases with breast cancer. From these 16 patients, 7 were additionally examined using Colour and Pulsed Wave Doppler Sonography. International literature offers little practical knowledge in this field. In the immediate surroundings of the inflammation, we were able to represent up to four arterial vessels per patient. The parameters of the flow velocity wave form of these vessels were compared to those of the vessels in the correspondent quadrant of the contralateral breast. In all cases, the maximum systolic and the minimum end diastolic velocities were higher than in the contralateral breast, giving evidence of an increased vascularity. In 6 cases, the pulsatility and resistance indices in the inflammatory vessels were lower because of a decreased peripheral resistance of the vessel. Under therapy with antibiotics or Bromocriptine, these parameters were equalized in both breasts. The model of nonpuerperal mastitis shows, that Colour and Pulsed Wave Doppler Sonography makes it possible to differentiate tumours of the breast on the basis of an analysis of their vascularity and the comparison with the parameters of the vessels in the contralateral breast. The effects of a pharmacological therapy on the vascularity of breast tumours can also be measured with this method.

  8. Two-dimensional quantum repeaters

    Science.gov (United States)

    Wallnöfer, J.; Zwerger, M.; Muschik, C.; Sangouard, N.; Dür, W.

    2016-11-01

    The endeavor to develop quantum networks gave rise to a rapidly developing field with far-reaching applications such as secure communication and the realization of distributed computing tasks. This ultimately calls for the creation of flexible multiuser structures that allow for quantum communication between arbitrary pairs of parties in the network and facilitate also multiuser applications. To address this challenge, we propose a two-dimensional quantum repeater architecture to establish long-distance entanglement shared between multiple communication partners in the presence of channel noise and imperfect local control operations. The scheme is based on the creation of self-similar multiqubit entanglement structures at growing scale, where variants of entanglement swapping and multiparty entanglement purification are combined to create high-fidelity entangled states. We show how such networks can be implemented using trapped ions in cavities.

  9. Two-dimensional capillary origami

    Science.gov (United States)

    Brubaker, N. D.; Lega, J.

    2016-01-01

    We describe a global approach to the problem of capillary origami that captures all unfolded equilibrium configurations in the two-dimensional setting where the drop is not required to fully wet the flexible plate. We provide bifurcation diagrams showing the level of encapsulation of each equilibrium configuration as a function of the volume of liquid that it contains, as well as plots representing the energy of each equilibrium branch. These diagrams indicate at what volume level the liquid drop ceases to be attached to the endpoints of the plate, which depends on the value of the contact angle. As in the case of pinned contact points, three different parameter regimes are identified, one of which predicts instantaneous encapsulation for small initial volumes of liquid.

  10. Two-dimensional cubic convolution.

    Science.gov (United States)

    Reichenbach, Stephen E; Geng, Frank

    2003-01-01

    The paper develops two-dimensional (2D), nonseparable, piecewise cubic convolution (PCC) for image interpolation. Traditionally, PCC has been implemented based on a one-dimensional (1D) derivation with a separable generalization to two dimensions. However, typical scenes and imaging systems are not separable, so the traditional approach is suboptimal. We develop a closed-form derivation for a two-parameter, 2D PCC kernel with support [-2,2] x [-2,2] that is constrained for continuity, smoothness, symmetry, and flat-field response. Our analyses, using several image models, including Markov random fields, demonstrate that the 2D PCC yields small improvements in interpolation fidelity over the traditional, separable approach. The constraints on the derivation can be relaxed to provide greater flexibility and performance.

  11. Significance of phentolamine redosing during prostaglandin E1 penile color Doppler ultrasonography in diagnosis of vascular erectile dysfunction.

    Science.gov (United States)

    Arafa, Mohamed; Eid, Hazem; Shamloul, Rany

    2007-05-01

    Recently, it was reported that phentolamine redosing during penile duplex can abolish a false diagnosis of venous leakage in patients with impotence. The aim of this study is to identify any useful role of phentolamine redosing in diagnosis of venogenic impotence. Sixty-seven consecutive patients complaining of weak erection for at least 6 months were included in this study. Penile color Doppler ultrasound (CDU) was performed using a 7.5 MHz linear array transducer with a color flow mapping capability. Following intracavernous injection of 20 microg prostaglandin E1 (PGE1), all patients with persistent end diastolic velocity (EDV) >5 cm/sec with an erectile response of E3 or lower, 20 min after intracavernosal injection of PGE1, were asked to revisit our clinic for a second CDU, 2 weeks later. During initial CDU examination, all 67 patients experienced poor response to 20 microg PGE1 with their average peak systolic velocity (PSV) and EDV being 42.8 and 6.6 cm/sec, respectively. The second CDU examination had similar results to the first one. Addition of 2 mg phentolamine did not significantly change the PSV and EDV of cavernosal arteries in any of the 67 patients. In conclusion, addition of intracavernous phentolamine during PGE1 CDU examination carries no advantage over the use of PGE1 alone regarding cavernosal artery response in patients with suspected venogenic EDV.

  12. Effect of brimonidine on the retrobulbar circulation in glaucomatous patients: a color Doppler study

    OpenAIRE

    Maria Rosa Bet de Moraes Silva; Hamilton Almeida Rollo; Schellini, Silvana A.

    2001-01-01

    Objetivo: Avaliar o efeito do tartarato de brimonidina a 0,2% tópico, instilado de 12/12 horas, na circulação retrobulbar em pacientes portadores de glaucoma. Métodos: Foram estudados os 2 olhos de 16 pacientes portadores de glaucoma primário de ângulo aberto e glaucoma crônico de ângulo estreito com iridotomia. Usando o Doppler colorido foram avaliados: velocidade sistólica máxima, velocidade diastólica final e índice de resistência das artéria central da retina, artéria ciliar posterior cur...

  13. Transabdominal color doppler ultrasonography: A relevant approach for assessment of effects of uterine torsion in buffaloes

    Directory of Open Access Journals (Sweden)

    Devender

    2016-08-01

    Full Text Available Aim: The present study was conducted on advanced pregnant buffaloes suffering from uterine torsion to assess the status of fetus and uterus by transabdominal ultrasonography, and the findings were compared with normal advanced pregnant buffaloes. Materials and Methods: The study was conducted on 20 clinical cases of uterine torsion and 20 normal advanced pregnant buffaloes (control group. The lower ventral area just lateral to linea alba (on both sides of the udder in standing animals was scanned transabdominally by the two-dimensional convex transducer for various ultrasonographic findings. The data collected were statistically analyzed by “one-way ANOVA” and “independent sample t-test” using computerized SPSS 16.0 software program. Results: Transabdominal ultrasonography revealed dead fetus in 95% uterine torsion cases and proved useful in imaging internal structures of fetuses while no dead fetus was reported in the control group. Size of umbilicus was found significantly decreased (p0.05 in uterine torsion group. Average thickness of the uterine wall and mean pixel values of fetal fluids (echogenicity were found significantly increased (p<0.05 in uterine torsion affected buffaloes in comparison to control group. Conclusion: Status of fetus (whether live or dead, internal status of uterus, and its contents could be determined by transabdominal ultrasonography in uterine torsion cases and thus determining the prognosis of the uterine torsion cases before going for further manipulations. This will also help in taking all the precautions to avoid death of the fetus.

  14. Standardization of the two-dimensional transcoelomic echocardiographic examination in the central bearded dragon (Pogona vitticeps).

    Science.gov (United States)

    Silverman, S; Sanchez-Migallon Guzman, D; Stern, J; Gustavsen, K A; Griffiths, L G

    2016-06-01

    To objectively and subjectively describe the normal spectrum of two-dimensional echocardiographic findings in the central bearded dragon (Pogona vitticeps). Sixteen central bearded dragons. Central bearded dragons were prospectively evaluated under manual restraint in right and left lateral recumbency to identify imaging planes for reproducible measurements of cardiac chambers, subjective two-dimensional analysis and color Doppler assessment. Echocardiography can be performed through windows in the left and right axillae. The window in the left axilla allows for a subjective and objective assessment of cardiac structure and function. The right axillary window allows for evaluation of pulmonary artery flow. Both views provide data for the presence of pericardial effusion or valvular insufficiency. With optimized imaging planes, cardiac chambers and fractional area change along with fractional shortening in the longitudinal and transverse planes can be calculated. Body weight and cardiac chamber dimensions of males were significantly larger than females. Ventricular fractional area change was the most consistent functional assessment. The majority of animals were found to have no evidence of valvular insufficiency, while approximately half had evidence of pericardial fluid. Pulmonary artery flow was assessed in all patients. Left and right aortic velocities cannot be reliably obtained. This study is the first to generate reference values for cardiac structure and function in clinically healthy central bearded dragons. Valvular insufficiency is not a normal finding in central bearded dragons, while mild pericardial effusion may be. Copyright © 2015 Elsevier B.V. All rights reserved.

  15. Accuracy of flow convergence estimates of mitral regurgitant flow rates obtained by use of multiple color flow Doppler M-mode aliasing boundaries: an experimental animal study.

    Science.gov (United States)

    Zhang, J; Jones, M; Shandas, R; Valdes-Cruz, L M; Murillo, A; Yamada, I; Kang, S U; Weintraub, R G; Shiota, T; Sahn, D J

    1993-02-01

    The proximal flow convergence method of multiplying color Doppler aliasing velocity by flow convergence surface area has yielded a new means of quantifying flow rate by noninvasively derived measurements. Unlike previous methods of visualizing the turbulent jet of mitral regurgitation on color flow Doppler mapping, flow convergence methods are less influenced by machine factors because of the systematic structure of the laminar flow convergence region. However, recent studies have demonstrated that the flow rate calculated from the first aliasing boundary of color flow Doppler imaging is dependent on orifice size, flow rate, aliasing velocity and therefore on the distance from the orifice chosen for measurement. In this study we calculated the regurgitant flow rates acquired by use of multiple proximal aliasing boundaries on color Doppler M-mode traces and assessed the effect of distances of measurement and aliasing velocities on the calculated regurgitant flow rate. Six sheep with surgically induced mitral regurgitation were studied. The distances from the mitral valve leaflet M-mode line to the first, second, and third sequential aliasing boundaries on color Doppler M-mode traces were measured and converted to the regurgitant flow rates calculated by applying the hemispheric flow equation and averaging instantaneous flow rates throughout systole. The flow rates that were calculated from the first, second, and third aliasing boundaries correlated well with the actual regurgitant flow rates (r = 0.91 to 0.96). The mean percentage error from the actual flow rates were 151% for the first aliasing boundary, 7% for the second aliasing boundary, and -43% for the third aliasing boundary; and the association between aliasing velocities and calculated flow rates indicates an inverse relationship, which suggests that in this model, there were limited velocity-distance combinations that fit with a hemispheric assumption for flow convergence geometry. The second aliasing

  16. Significance of clearing differentiated thyroid carcinoma lymph node by high-frequency color Doppler ultrasonography.

    Science.gov (United States)

    Liu, Bing; Qin, Huadong; Zhang, Bin; Shi, Tiefeng; Li, Chuanle; Liu, Yao; Song, Meiyue

    2017-01-01

    We compared the clinical effects and prognosis of patients receiving lymph node dissection after surgical removal of the thyroid tissues and those not receiving it after the removal. A total of 80 patients diagnosed with differentiated thyroid carcinoma (DTC) by our hospital from March 2012 to March 2014 were successively included in the study. The cases were divided into the control group (n=36 cases) and observation group (n=44 cases), and the two groups underwent total or subtotal resection of the thyroid. In the control group, patients underwent preoperative high-frequency color ultrasonography, and the most suspicious lymph node was removed. In the observation group, patients underwent preoperative high-frequency color ultrasonography, and the surgeons cleared the lymph node of the widest range. Difference in clinical effects and prognosis of the two groups were compared. After nearly a year's follow-up observation, the tumor recurrence rate of the observation group was significantly lower than that of the control group and the survival rate of the observation group was significantly higher than that of the control group (P0.05). When comparing the data of lymphatic metastasis tested by preoperative high-frequency color ultrasonography with intraoperative diagnosed figures, sensitivity was 97.4%, specificity 33.3%, positive predictive value 90.2% and the negative predictive value 66.7%. In conclusion, removal of the lymph node for DTC patients having undergone thyroid tissue excision with preoperative high-frequency color ultrasonography can be beneficial to improve the effects along with reduction in the recurrence rate.

  17. Classifying Two-dimensional Hyporeductive Triple Algebras

    CERN Document Server

    Issa, A Nourou

    2010-01-01

    Two-dimensional real hyporeductive triple algebras (h.t.a.) are investigated. A classification of such algebras is presented. As a consequence, a classification of two-dimensional real Lie triple algebras (i.e. generalized Lie triple systems) and two-dimensional real Bol algebras is given.

  18. The Clinical Value of Color Doppler Ultrasound in the Diagnosis of Diabetic Nephropathy%彩超在糖尿病肾病诊断中的临床价值

    Institute of Scientific and Technical Information of China (English)

    李然

    2015-01-01

    Objective To evaluate the diagnostic value of CDFI ultrasound in diabetic nephropathy. Methods CDFI ultra-sound technology for the different stages of diabetic nephropathy kidney multi-point sampling inspection, observation of the two-dimensional representation of kidney and blood flow parameters, and its hemodynamic changes were semi-quantitative research. Results Each two-dimensional representation of diabetic nephropathy and kidney disease was positively correlat-ed;flow parameters and the normal group, the difference was statistically significant(P<0.05). Conclusion Color Doppler ul-trasound diagnosis of diabetic nephropathy due to increase of sampling points, so a more detailed set of critical parameters, provide a reliable basis for clinical.%目的:探讨CDFI超声对糖尿病肾病的诊断价值。方法应用CDFI超声技术对不同阶段糖尿病肾病肾脏多点取样检查,观察肾脏二维表现及其血流参数变化,并对其血流动力学改变进行半定量研究。结果各期糖尿病肾病肾脏二维表现与病情呈正相关性;血流参数与正常组比较,差异有统计学意义(P<0.05)。结论彩色多普勒超声对糖尿病肾病的诊断因取样点的增加,使临界参数的设置更细化,为临床提供可靠依据。

  19. COMPLEX TRANSRECTAL US WITH COLOR FLOW MAPPING, DOPPLER SONOGRAPHY AND SONOELASTOGRAFIEY IN PROSTATE CANCER EVALUATION

    Directory of Open Access Journals (Sweden)

    А. I. Mukhomor

    2014-07-01

    Full Text Available Oncology statistics shows steady increase of prostate cancer, since early diagnosis and adequate treatment are crucial. Among prostate imaging modalities sonoelastography (SEG has a special value for identifying suspicious dense foci in prostate, however more studies are still required to establishing accuracy and specificity with different SEG techniques for updating the prostate cancer diagnostics protocol.The aim of study was to evaluate sonoelastography capabilities for ultrasound guided prostate biopsy, comparing with gray scale and Doppler modalities.512 consecutively selected patients were examined (mean age of 56 years, mean prostate volume was 54 cm3, the average PSA about 14.3 ng/ml. All patients underwent prostate cancer diagnostic algorithm, including direct rectal exam, PSA level, transrectal ultrasound (TRUS with Doppler and SEG identification of suspicious foci, mostly in peripheral zones, followed by 10-point biopsy guided by ultrasound. According to aim we assigned patients to 4 groups: group 1 (n = 327 underwent gray scale and Doppler US guided prostate biopsy; in patients of group 2 (n = 106 – additionally SEG was applied (3 patients of this group was also performed MRI and MRS of the prostate; in group 3 there were patients with high level of PSA and negative TRUS guided biopsy; group 4 – of 41 patiens with prostatectomy and biochemical recidive of prostate.Among 430 cases included to this study in 318 patients (74 % prostate adenocarcinoma was revealed, in 270 (63 % patients – benign hyperplasia (BH. In group 1 cancer was diagnosed in 236 (72.1 ± 2.4 % patients, in group 2 – in 84 (79.2 ± 3.8 %. 19 false negative and 6 false positive results were registered in SEG enchanced US guided prostate biopsy. Routine TRUS indicate lesions with mean sizes about 0.8 ± 0,21 sm in compare with 0,5 ± 0,08 sm which were diagnose by SEG. Locuses which were marked as benign byTRUS with SEG hade never conatained neoplastic cells

  20. New adaptive clutter rejection based on spectral analysis for ultrasound color Doppler imaging: phantom and in vivo abdominal study.

    Science.gov (United States)

    Geunyong Park; Sunmi Yeo; Jae Jin Lee; Changhan Yoon; Hyun-Woo Koh; Hyungjoon Lim; Youngtae Kim; Hwan Shim; Yangmo Yoo

    2014-01-01

    Effective rejection of time-varying clutter originating from slowly moving vessels and surrounding tissues is important for depicting hemodynamics in ultrasound color Doppler imaging (CDI). In this paper, a new adaptive clutter rejection method based on spectral analysis (ACR-SA) is presented for suppressing nonstationary clutter. In ACR-SA, tissue and flow characteristics are analyzed by singular value decomposition and tissue acceleration of backscattered Doppler signals to determine an appropriate clutter filter from a set of clutter filters. To evaluate the ACR-SA method, 20 frames of complex baseband data were acquired by a commercial ultrasound system equipped with a research package (Accuvix V10, Samsung Medison, Seoul, Korea) using a 3.5-MHz convex array probe by introducing tissue movements to the flow phantom (Gammex 1425 A LE, Gammex, Middleton, WI, USA). In addition, 20 frames of in vivo abdominal data from five volunteers were captured. From the phantom experiment, the ACR-SA method provided 2.43 dB (p SCR) compared to static (STA) and down-mixing (ACR-DM) methods. Similarly, it showed smaller values in fractional residual clutter area (FRCA) compared to the STA and ACR-DM methods (i.e., 2.3% versus 5.4% and 3.7%, respectively, ). The consistent improvements in SCR from the proposed ACR-SA method were obtained with the in vivo abdominal data (i.e., 4.97 dB and 3.39 dB over STA and ACR-DM, respectively). The ACR-SA method showed less than 1% FRCA values for all in vivo abdominal data. These results indicate that the proposed ACR-SA method can improve image quality in CDI by providing enhanced rejection of nonstationary clutter.

  1. High-frequency subharmonic pulsed-wave Doppler and color flow imaging of microbubble contrast agents.

    Science.gov (United States)

    Needles, A; Goertz, D E; Karshafian, R; Cherin, E; Brown, A S; Burns, P N; Foster, F S

    2008-07-01

    A recent study has shown the feasibility of subharmonic (SH) flow imaging at a transmit frequency of 20 MHz. This paper builds on these results by examining the performance of SH flow imaging as a function of transmit pressure. Further, we also investigate the feasibility of SH pulsed-wave Doppler (PWD) imaging. In vitro flow experiments were performed with a 1-mm-diameter wall-less vessel cryogel phantom using the ultrasound contrast agent Definity and an imaging frequency of 20 MHz. The phantom results show that there is an identifiable pressure range where accurate flow velocity and power estimates can be made with SH imaging at 10 MHz (SH10), above which velocity estimates are biased by radiation force effects and unstable bubble behavior, and below which velocity and power estimates are degraded by poor SNR. In vivo validation of SH PWD was performed in an arteriole of a rabbit ear, and blood velocity estimates compared well with fundamental (F20) mode PWD. The ability to suppress tissue signals using SH signals may enable the use of higher frame rates and improve sensitivity to microvascular flow or slow velocities near large vessel walls by reducing or eliminating the need for clutter filters.

  2. Congenital arterioportal fistulas: radiological treatment and color Doppler US follow-up

    Energy Technology Data Exchange (ETDEWEB)

    Teplisky, Dario; Tincani, Eliana Uruena; Lipsich, Jose; Sierre, Sergio [Department of Interventional Radiology, Pichincha 1890, Buenos Aires (Argentina)

    2012-11-15

    Congenital intrahepatic arterioportal fistulas (APFs) are a rare cause of portal hypertension in children. Doppler US is a useful diagnostic imaging modality. Transarterial embolization is a minimally invasive and effective therapy allowing occlusion of the fistula and restoration of liver hemodynamics. To describe the clinical and radiologic findings, percutaneous treatment and role of D-US in the postembolization follow-up of children with APF. Between 2002 and 2011, four children with APF were treated. Initial diagnosis and follow-up was performed with D-US and confirmed by arteriography, followed by endovascular embolization in all patients. D-US demonstrated abnormal arterioportal communications in all patients. Six endovascular procedures were performed in these four children. In two children, no residual fistula was seen on D-US after the first procedure and symptoms resolved. In the other two children, D-US demonstrated residual flow through the fistula, with resolution of pathological D-US findings and symptoms after the second endovascular procedure. All four children were successfully treated and asymptomatic at the end of follow-up. The mean follow-up was 24 months. Interventional radiology has a key role in the treatment of congenital APF. D-US is a noninvasive and effective tool for the diagnosis and follow-up of these patients. (orig.)

  3. Two-dimensional function photonic crystals

    CERN Document Server

    Wu, Xiang-Yao; Liu, Xiao-Jing; Liang, Yu

    2016-01-01

    In this paper, we have firstly proposed two-dimensional function photonic crystals, which the dielectric constants of medium columns are the functions of space coordinates $\\vec{r}$, it is different from the two-dimensional conventional photonic crystals constituting by the medium columns of dielectric constants are constants. We find the band gaps of two-dimensional function photonic crystals are different from the two-dimensional conventional photonic crystals, and when the functions form of dielectric constants are different, the band gaps structure should be changed, which can be designed into the appropriate band gaps structures by the two-dimensional function photonic crystals.

  4. Primary chronic venous insufficiency of the lower extremities: preoperative color duplex Doppler ultrasound study; Insuficiencia venosa cronica primaria de los miembros inferiores. Valoracion prequirurgica con ecografia Doppler duplex color

    Energy Technology Data Exchange (ETDEWEB)

    Selfa, S.; Diago, T.; Ricart, M.; Chulia, R.; Martin, F. [Hospital Lluis Xativa. Valencia (Spain)

    2000-07-01

    To asses the role of color duplex Doppler ultrasound (CDU) in the preoperative study of patients with varicose veins in lower extremities. We employed CDU to examine varicose veins in 342 lower limbs, assessing reflux in saphenous veins (SV), deep venous system (DVS) and perforating veins (PV). We analyzed the relationship between the anatomical extent of the reflux and the clinical findings. Insufficiency of the superficial venous system alone was uncommon, occurring in only 10.8% of the limbs examined. Reflux was observed in SV and PV in 48.2% of the legs. It was detected in all three systems in 29.2% of cases. The presence of reflux in more than one system and more than one value was associated with increased clinical severity. The site of venous reflux in lower extremities with varicose veins varies. Greater clinical severity is observed in the presence of more marked reflux in the DVS and PV. CDU provides anatomic and functional data on the three venous systems of the lower limbs, allowing an individualized therapeutic surgery. Preoperative localization of incompetent PV by means of CDU facilities their ligation. CDU is the technique of choice for the preoperative examination of the venous systems of patients with varicose veins. (Author)

  5. Correlations between contrast enhanced color Doppler US and neoangiogenesis in small prostate carcinomas; Correlazioni tra color Doppler con uso di mezzo di contrasto e neoangiogenesi dei piccoli carcinomi prostatici

    Energy Technology Data Exchange (ETDEWEB)

    Lagalla, R.; Caruso, G.; Caruso, R.; Bizzini, G. [Policlinico Universitario P. Giaccone, Palermo (Italy). Ist. di Radiologia; Marasa' , L. [Ospedale Oncologico M. Ascoli, Palermo (Italy). Servizio di Anatomia Patologica; Miceli, V. [Policlinico Universitario P. Giaccone, Palermo (Italy). Ist. di Clinica Urologica

    2000-04-01

    Aim of the work was to investigate if the use of a contrast agent (Levovist) improves the specificity of ultrasonography in the diagnosis of prostate carcinoma, having the results of prostate biopsy as the gold standard. The results have been compared with the microscopic angiogenesis grading system (MAGS) index; they exceed 30 in 11 avascular lesions value indicates microangiogenesis. In the other two cases a minor value of 30 was correlated with a different type of tumor vascularisation typical of macroangiogenesis. [Italian] Scopo del lavoro e' verificare se l'impiego del mezzo di contrasto Levovist (Schering, Berlino) consente di migliorare la specificta' dell'esame ecografico nella diagnosi del carcinoma prostatico, avendo come riferimento i risultati della biopsia prostatica. Trenta pazienti con esame obiettivo sospetto per carcinoma prostatico e antigene prostatico specifico (PSA) compreso tra 5 e 15 ng/ml, sono stati studiati con ecografia transrettale integrata da esame color Doppler e somministrazione di mdc. I risultati ottenuti sono stati confrontati con l'indice Microscopic Angiogenesis Grading System (MAGS) che nelle sezioni istologiche degli 11 casi con aspetto avascolare e' stato superato a 30, espressione di microgenesi; negli altri due casi, il valore inferiore a 30 e' conciso con un differente modello di vascolarizzazione neoplastica proprio della microangiogenesi.

  6. Color Doppler imaging of the ophthalmic artery in patients with chronic heart failure

    Directory of Open Access Journals (Sweden)

    Daniela B. Almeida-Freitas

    2011-10-01

    Full Text Available Purpose: To evaluate the ophthalmic artery hemodynamics in patients with chronic heart failure. Methods: Doppler parameters of ophthalmic artery of 18 patients with chronic heart failure in different stages of the disease were compared with 21 healthy volunteers (control group. These parameters were also correlated with echocardiographic assessments and clinical cardiologic status. Results: Mean diastolic velocity was 5.14 ± 2.4 cm/s in the chronic heart failure group and 7.44 ± 3.5 cm/s in the control group (p=0.007. Mean resistance index of the ophthalmic artery was 0.76 ± 0.08 in the chronic heart failure group and 0.70 ± 0.08 in the control group (p=0.04. Mean systolic velocity of the ophthalmic artery was 22.03 ± 7.7 cm/s in the chronic heart failure group and 25.32 ± 9.2 cm/s in the control group (p=0.24. There was a negative correlation between the resistance index of the ophthalmic artery and systemic blood pressure of patients with chronic heart failure (r= -0.47, p=0.007. Diastolic velocity of the ophthalmic artery correlated positively with systemic blood pressure (r=0.44, p=0.02. Conclusion: Lower diastolic velocity and higher resistance index were observed in the ophthalmic artery of chronic heart failure patients when compared to the control group, which probably reflects the presence of orbital vasoconstriction in response to low cardiac output. Therefore, the influence of these findings on the structure and function of the optic nerve head deserves investigation.

  7. Transvaginal color Doppler imaging of uterine contractions in early pregnancies: Significance of uterine contractions in early pregnancy failure

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Eun Ju; Han, Chang Jin; Suh, Jung Ho; Kwon, Hyuck Chan [Aju University SChool of Medicine, Suwon (Korea, Republic of)

    1999-06-15

    To assess uterine contractions in early pregnancies using transvaginal color Doppler sonography (TVCDS) and to determine the role of uterine contractions in the diagnosis of early pregnancy failure. 76 patients with abnormal pregnancy diagnosed by sonography or histopathology up to 10 weeks of gestation and 38 normal pregnant women as the control group were examines with TVCDS. The presence of uterine contractions was determined by complete or partial disappearance of the color flow signals of vessels within myometrium, and the direction, amplitude (grade 1-3), and interval of uterine contractions were also evaluated. Uterine contractions were identified in 42 (55.3%) of 76 patients with abnormal pregnancy, whereas they were detected only in 2 (5.3%) of 38 normal pregnant women who had initial grade 1 contraction but disappeared in the follow-up study. In 26 patients with blighted ovum or missed abortion, 15 patients (57.7%),showed uterine contraction of grade 1 in 3 cases, grade 2 in 8 cases, and grade 3 in 4 cases and interval from 45 seconds to 5 minutes. In 30 patients with inevitable or incomplete abortion, 23 patients (76.6%) showed uterine contraction of grade 1 in 2 cases, grade 2 in 9 cases, and grade 3 in 12 cases and interval from 1 to 5 minutes. 4 (20%) of 20 patients with threatened abortion had uterine contraction of grade 2 and interval from 2 to 4 minutes. The presence of uterine contractions was significantly different in abnormal pregnancies compared with that of normal and also among the tree different groups of abnormal pregnancies, but the amplitude did not differ.

  8. Efficacy of Preoperative Color Doppler Sonography of Lower Extremity Veins on Postoperative Outcomes in Candidates of Saphenectomy: A Randomized Clinical Trial

    Science.gov (United States)

    Zarepur, Rouhollah; Kargar, Saeed; Hadadzadeh, Mehdi; Hatamizadeh, Nooshin; Zarepur, Ehsan; Forouzannia, Seyed Khalil; Faraji, Reza; Sarebanhassanabadi, Mohammadtaghi

    2016-01-01

    Background Doppler sonography is a type of sonography used for imaging the blood flow in the vessels and heart. This technique uses ultrasound waves with high frequency. In some patient candidates for venous graft, the identification of the suitable vein is not possible with clinical examination. Objective This study compared the effects of preoperative color Doppler sonography of lower extremity veins on the postoperative outcomes of saphenectomy. Methods This randomized clinical trial was conducted on 100 candidates of an off-pump coronary artery bypass graft (CABG) hospitalized in Afshar Hospital in Yazd in 2015. Patients were divided into two groups: 50 patients in the study group and 50 patients in the control group. Patients in the study group underwent color Doppler sonography of lower extremity veins using the Medison 8000 Live device. Patients in the control group were assessed preoperatively by routine venous examination without undergoing color Doppler sonography. The prepping and draping methods and also the preoperative antibiotics were the same for both groups. The patients were assessed for wound infection, edema, hematoma, and DVT 2 days, 1 week, and 1 month after surgery. Data were analyzed by SPSS version 16 using t-test, Chi-square, and Fisher’s exact test. Results The length of incision for saphenectomy was 29.20 ± 3.71 cm in the Doppler group and 28.98 ± 3.72 cm in the non-Doppler group with no significant difference between the two groups (p=0.768). The two groups were not significantly different with respect to age, gender, diabetes, hypertension, hyperlipidemia, smoking, and history of peripheral vessels disease, postoperative infection, postoperative organ edema, postoperative hematoma, and postoperative DVT. Conclusion Preoperative color Doppler sonography of the saphenous vein before saphenectomy has no effect on reducing the postoperative complications, and saphenectomy on the basis of intraoperative examination of the vein course by

  9. Color Doppler monitoring of changes of utero-placental-fetal circulation in normal pregnancy and intrauterine growth retardation.

    Science.gov (United States)

    Xu, J; Wen, L; Ma, T; Zhang, Y; Zhang, Q; Gao, S; Zhao, M; Wu, H; Hu, J

    1997-01-01

    The utero-placental-fetal circulation (UPFC) of 150 subjects during second and third trimester was examined by using color Doppler. Of them 89 were normal woman and 58 were patients with intrauterine growth retardation IUGR). Our results showed that UPFC was increased gradually during normal pregnant period. In IUGR patients it was revealed that TAV and Q of UmA, UmV and UtA decreased at 20th week of gestation, especially after 30th week. PI, RI and S/D ratio of UmA were increased, but TAV, Q of UmA and UmV were markly reduced, so was UtA. PI were increased, but the changes of RI, S/D ratio in UtA were not significant. Hemodynamical findings of UmA, UmV and UtA were abnormal in 92.53% of IUGR patients. Only 81.03% present abnormal S/D ratio of UmA (P UPFC function directly. It is one of the best methods for monitoring IUGR and might be used for early diagnosis of IUGR. The main pathophysiological changes of IUGR were UPFC obstruction and placental disfunction.

  10. Effect of sample volume size and sampling method on feline longitudinal myocardial velocity profiles from color tissue Doppler imaging.

    Science.gov (United States)

    Granström, Sara; Pipper, Christian Bressen; Møgelvang, Rasmus; Sogaard, Peter; Willesen, Jakob Lundgren; Koch, Jørgen

    2012-12-01

    The aims of this study were to compare the effect of sample volume (SV) size settings and sampling method on measurement variability and peak systolic (s'), and early (e') and late (a') diastolic longitudinal myocardial velocities using color tissue Doppler imaging (cTDI) in cats. Twenty cats with normal echocardiograms and 20 cats with hypertrophic cardiomyopathy. We quantified and compared empirical variance and average absolute values of s', e' and a' for three cardiac cycles using eight different SV settings (length 1,2,3 and 5 mm; width 1 and 2 mm) and three methods of sampling (end-diastolic sampling with manual tracking of the SV, end-systolic sampling without tracking, and random-frame sampling without tracking). No significant difference in empirical variance could be demonstrated between most of the tested SVs. However, the two settings with a length of 1 mm resulted in a significantly higher variance compared with all settings where the SV length exceeded 2 mm (p sampling method on the variability of measurements (p = 0.003) and manual tracking obtained the lowest variance. No difference in average values of s', e' or a' could be found between any of the SV settings or sampling methods. Within the tested range of SV settings, an SV length of 1 mm resulted in higher measurement variability compared with an SV length of 3 and 5 mm, and should therefore be avoided. Manual tracking of the sample volume is recommended. Copyright © 2012 Elsevier B.V. All rights reserved.

  11. CORRELATION OF HIGH RESOLUTION ULTRASOUND AND COLOR DOPPLER FINDINGS OF THYROID NODULES WITH FINE NEEDLE ASPIRATION CYTOLOGY

    Directory of Open Access Journals (Sweden)

    Rajendra Kumar

    2015-07-01

    Full Text Available The objective of this study was to assess the utility of gray scale and color Doppler Ultrasonographic (US findings in characterization of benign and malignant thyroid nodules in correlation with the pathological diagnosis. METHODS: From January 2013 through December 2013, a total of 70 patients with solitary thyroid nodule underwent thyroid US with 7.5 – 12 MHz, linear array transducer of ESOATE MYLAB 40 . The following characteristics of each nodule were determined: Nodule diameter, Shape , Margins, Internal Contents , Echo texture, Halo, Presence and pattern of calcification, Pattern of vascularity, resistive index (RI of Intranodular/Peripheral vessels, and Association of cervical lymphadenopathy. Sensitivity, specificity, and positive and negative predictive values were obtained. The results were then compared to the fine needle aspira tion (FNA/Histopathological diagnosis. Diagnostic accuracy of US was determined using multiple logistic regression analysis. RESULTS: Statistically significant ( P peripheral pattern of vascularity and associated cervical lymphadenopathy. The overall diagnostic accuracy of thyroid US for differentiating a malignant lesion from a benign one was found to be 84.3%. CONCLUSION: Taller - than - wide shape, Lobulated/poorly defined margins, Hypoechogenicity and Marked hypoechogenicity, Microcalcifications and Central/central >peripheral pattern of vascularity are helpful criteria for the discrimination of malignant from benign nodules. Thyroid US achieved a good overall diagnostic accuracy in the categorization of benign and malignant thyroid nodules.

  12. Neoangiogenesis in early cervical cancer: Correlation between color Doppler findings and risk factors. A prospective observational study

    Directory of Open Access Journals (Sweden)

    Mazaira Jesús

    2008-11-01

    Full Text Available Abstract Background The aim of the present article was to evaluate whether angiogenic parameters as assessed by transvaginal color Doppler ultrasound (TVCD may predict those prognostic factors related to recurrence. Methods A total of 27 patients (mean age: 51.3 years, range: 29 to 85 with histologically proven early stage invasive cervical cancer were evaluated by TVCD prior to surgery. Subjective assessment of the amount of vessels within the tumor (scanty-moderate or abundant and pulsatility index (PI were recorded. All patients underwent radical hysterectomy and pelvic lymph node dissection. Postoperative treatment (RT or chemoradiotherapy was given according to risk factors (positive lymph nodes, parametrial and vaginal margin involvement, depth stromal invasion, lymph-vascular space involvement Results Tumors with "abundant" vascularization were significantly associated with pelvic lymph node metastases, depth stromal invasion > 10 mm, lymph-vascular space involvement, tumor diameter > 17.5 mm, and parametrial involvement. Postoperative treatment was significantly more frequent in patients with "abundant" vascularization (OR: 20.8, 95% CIs: 2 to 211. The presence of scanty-moderate vascularization with a PI 0.82 or PI Conclusion The results are consistent with a relationship between tumor angiogenesis and prognostic factors for recurrence in early cervical cancer. "Abundant" vascularization and PI

  13. Color Doppler Ultrasound of Lower Extremity Varicose Veins: A Simple Grading of Sapheno-Femoral Junction Reflux

    Energy Technology Data Exchange (ETDEWEB)

    Huh, Sik; Hong, Suk Joo; Kim, Shin Kee; Hong, Sun Hwa [Korea University Guro Hospital, Korea University College of Medicine, Seoul (Korea, Republic of); Park, Sang Woo [Konkuk University Hospital, Konkuk University School of Medicine, Seoul (Korea, Republic of); Kim, Yeon Soo [Ilsan Paik Hospital, Inje University College of Medicine, Goyang (Korea, Republic of)

    2011-12-15

    To establish a simple grading method for the severity of an incompetent sapheno-femoral junction (SFJ) using color Doppler ultrasound in patients with lower extremity varicose veins. 346 legs of 241 consecutive patients with varicose veins were examined (M:F = 96:145, 11-74 years, mean 50 years). The severity of SFJ and sapheno-popliteal (SPJ) incompetence was graded from I to IV according to the patient's position (standing versus supine or prone) and whether the Valsalva's maneuver had been induced. The extent of varicose veins was graded as I to III by the US findings in the SFJ incompetence group. The grading of SFJ incompetence was compared to the extent of varicose vein. SFJ, SPJ, both SFJ and SPJ, and perforator incompetence was observed in 198 (57.2%), 81 (23.4%), 21 (6.1%) and 54 (15.6%), respectively. Among the SFJ incompetence group, severity grade I - IV were observed in 14 (7.1%), 75 (37.9%), 73 (36.9%), and 36 (18.2%), respectively, and the extent grade I - III were noted in 47 (23.7%), 95 (48.0%), and 56 (28.3%), respectively. The SFJ incompetence grade and varicose extent grade showed a positive correlation (p < 0.0001). Simple sonographic grading of the severity of SFJ incompetence is possible. The extent of varicose veins in the SFJ incompetence group can be determined using this new grading system

  14. Validation of color Doppler ultrasonography for evaluating the uterine blood flow and perfusion during late normal pregnancy and uterine torsion in buffaloes.

    Science.gov (United States)

    Hussein, Hassan A

    2013-04-15

    The aim of this study was to verify the efficacy of color Doppler ultrasonography for diagnosis of degree and duration of uterine torsion in buffaloes. In Assiut province/Upper Egypt, 65 buffaloes (37 with uterine torsion, 28 with normal late pregnancy) were examined clinically and using Doppler ultrasonography. The Doppler indices including resistance index (RI), pulsatility index (PI), time-averaged maximum velocity (TAMV), and blood flow volume (BFV) in the arteries ipsilateral to the uterine torsion (IPUT) and in arteries contralateral to the uterine torsion (COUT) were recorded. Methods of correction were documented along with dam and calf survival. Torsion was recorded postcervically with vaginal involvement in 35/37 (94.6%) of the cases. The degrees of uterine torsion were light and high in 9/37 (24.3%) and 28/37 (75.7%) of the cases, respectively (P = 0.001). Right uterine torsion was present in 36/37 (97.3%) of the cases (P = 0.0001). Pulsatility index, RI, TAMV, and BFV in IPUT and COUT did not differ significantly (P > 0.05) in normal late pregnancy. The PI and RI in IPUT were significantly higher (P perfusion. In conclusion, depicting blood flow within the middle uterine artery using color Doppler sonography could be helpful in correct diagnosis of duration and degree of uterine torsion and concurrently predicting the viability of the fetus and dam.

  15. Association of maternal and umbilical cord blood leptin concentrations and abnormal color Doppler indices of umbilical artery with fetal growth restriction

    Directory of Open Access Journals (Sweden)

    Elahe Zareaan

    2017-08-01

    Full Text Available Background: Fetal growth restriction (FGR is a condition with heterogeneous pathophysiology which characterized by fetal weight less than the tenth percentile for gestational age. Several factors have impact on maternal, placental and fetal due to growth restriction. Objective: The aim of this study was to investigate the relationship between levels of leptin in the cord, and serum leptin of mothers also abnormal color Doppler indices of umbilical artery with fetal growth restriction. Materials and Methods: This is a cross sectional study conducted in Isfahan, Iran, 2015-2016. We recruited 40 women with singleton pregnancies complicated by fetal growth restriction (Group I and 40 pregnant women with normal fetal growth (Group II with matched age. Maternal serum and umbilical artery leptin levels were determined with Enzyme-Linked immunosorben method. Also, color Doppler ultrasound of umbilical artery was performed. Results: Mean maternal and fetal leptin levels were lower in the FGR group compared to the normal group (36.58±(20.99 and 7.42 ±(4.08vs. 47.32±(22.50 and 30.49±(14.50 respectively. Also, mean fetal leptin level was lower in the group with abnormal color Doppler sonographic indices compared to the normal group (7. 40 ±(4.10vs 27.06±(15.80, respectively. Conclusion: This study indicated that maternal and fetal leptin levels are correlated with FGR originating from damaged placental function; also fetal leptin level can indicate changes in color Doppler sonographic indices.

  16. 宫外孕的彩超诊断价值及临床意义%Diagnostic value and clinical significance of color Doppler ultrasound for ectopic pregnancy

    Institute of Scientific and Technical Information of China (English)

    高鸣

    2014-01-01

    目的:探讨彩超对宫外孕的诊断价值以及临床意义。方法回顾性分析88例宫外孕患者的临床及影像学资料。结果超声检查的88例宫外孕患者,诊断符合82例,误诊6例,确诊率为93.18%。结论彩超对宫外孕的诊断分辨力高、简便、快捷、诊断符合率较高,能为临床提供及时和切实可靠的诊断依据。%Objective To explore the diagnostic value and clinical significance of color Doppler ultrasound for ectopic pregnancy. Methods A retrospective analysis was made on the clinical and imaging data of 88 ectopic pregnancy patients. Results Among the 88 cases, who underwent color Doppler ultrasound examination, there were 82 cases with qualified diagnosis and 6 misdiagnosed cases. The accurate diagnosis rate was 93.18%. Conclusion Color Doppler ultrasound for ectopic pregnancy has the advantages of high diagnostic definition, convenience, high speed, and high diagnose accordance rate, thus it can provide timely and reliable information for clinicosis.

  17. Imaging features of gray-scale and contrast-enhanced color doppler US for the differentiation of transient renal arterial ischemia and arterial infarction

    Energy Technology Data Exchange (ETDEWEB)

    Park, Byung Kwan; Kim Seung Hyup [Seoul National University Hospital, Seoul (Korea, Republic of); Moon, Min Hwan; Jung, Sung Il [Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of)

    2005-09-15

    To characterize the imaging features on gray-scale and contrast-enhanced color Doppler US images which differentiate renal ischemia from renal infarction. The segmental renal arteries of eight healthy rabbits were surgically ligated. In four of these rabbits, the ligated renal artery was released 60 minutes after arterial occlusion to cause transient ischemia. In the remaining four rabbits, the arterial ligation was retained to cause a permanent infarction. The gray-scale and contrast-enhanced color Doppler US imaging features of the involved renal parenchymal of both ischemia and infarction groups were compared with respect to the presence or absence of parenchymal swelling, echogenicity changes, tissue loss and perfusion defects. Parenchyma swelling, echogenic changes, tissue loss and perfusion defects were found to be more extensive in the infarction than the ischemia group. The hyperechoic areas reperfused with blood flow recovered normal echogenicity and perfusion, whereas the hyperechoic areas without reperfusion became renal infarcts. Gray-scale and contrast-enhanced color Doppler US showed that the hyperechoic areas with reperfusion may reverse to normal parenchyma and allow the differentiation of renal ischemia from renal infarction.

  18. Hadamard States and Two-dimensional Gravity

    CERN Document Server

    Salehi, H

    2001-01-01

    We have used a two-dimensional analog of the Hadamard state-condition to study the local constraints on the two-point function of a linear quantum field conformally coupled to a two-dimensional gravitational background. We develop a dynamical model in which the determination of the state of the quantum field is essentially related to the determination of a conformal frame. A particular conformal frame is then introduced in which a two-dimensional gravitational equation is established.

  19. Topological defects in two-dimensional crystals

    OpenAIRE

    Chen, Yong; Qi, Wei-Kai

    2008-01-01

    By using topological current theory, we study the inner topological structure of the topological defects in two-dimensional (2D) crystal. We find that there are two elementary point defects topological current in two-dimensional crystal, one for dislocations and the other for disclinations. The topological quantization and evolution of topological defects in two-dimensional crystals are discussed. Finally, We compare our theory with Brownian-dynamics simulations in 2D Yukawa systems.

  20. Color Tissue Doppler to Analyze Fetal Cardiac Time Intervals: Normal Values and Influence of Sample Gate Size.

    Science.gov (United States)

    Willruth, A M; Steinhard, J; Enzensberger, C; Axt-Fliedner, R; Gembruch, U; Doelle, A; Dimitriou, I; Fimmers, R; Bahlmann, F

    2016-02-04

    Purpose: To assess the time intervals of the cardiac cycle in healthy fetuses in the second and third trimester using color tissue Doppler imaging (cTDI) and to evaluate the influence of different sizes of sample gates on time interval values. Materials and Methods: Time intervals were measured from the cTDI-derived Doppler waveform using a small and large region of interest (ROI) in healthy fetuses. Results: 40 fetuses were included. The median gestational age at examination was 26 + 1 (range: 20 + 5 - 34 + 5) weeks. The median frame rate was 116/s (100 - 161/s) and the median heart rate 143 (range: 125 - 158) beats per minute (bpm). Using small and large ROIs, the second trimester right ventricular (RV) mean isovolumetric contraction times (ICTs) were 39.8 and 41.4 ms (p = 0.17), the mean ejection times (ETs) were 170.2 and 164.6 ms (p < 0.001), the mean isovolumetric relaxation times (IRTs) were 52.8 and 55.3 ms (p = 0.08), respectively. The left ventricular (LV) mean ICTs were 36.2 and 39.4 ms (p = 0.05), the mean ETs were 167.4 and 164.5 ms (p = 0.013), the mean IRTs were 53.9 and 57.1 ms (p = 0.05), respectively. The third trimester RV mean ICTs were 50.7 and 50.4 ms (p = 0.75), the mean ETs were 172.3 and 181.4 ms (p = 0.49), the mean IRTs were 50.2 and 54.6 ms (p = 0.03); the LV mean ICTs were 45.1 and 46.2 ms (p = 0.35), the mean ETs were 175.2 vs. 172.9 ms (p = 0.29), the mean IRTs were 47.1 and 50.0 ms (p = 0.01), respectively. Conclusion: Isovolumetric time intervals can be analyzed precisely and relatively independent of ROI size. In the near future, automatic time interval measurement using ultrasound systems will be feasible and the analysis of fetal myocardial function can become part of the clinical routine.

  1. Heart wall motion analysis by dynamic 3D strain rate imaging from tissue Doppler echocardiography

    Science.gov (United States)

    Hastenteufel, Mark; Wolf, Ivo; de Simone, Raffaele; Mottl-Link, Sibylle; Meinzer, Hans-Peter

    2002-04-01

    The knowledge about the complex three-dimensional (3D) heart wall motion pattern, particular in the left ventricle, provides valuable information about potential malfunctions, e.g., myocardial ischemia. Nowadays, echocardiography (cardiac ultrasound) is the predominant technique for evaluation of cardiac function. Beside morphology, tissue velocities can be obtained by Doppler techniques (tissue Doppler imaging, TDI). Strain rate imaging (SRI) is a new technique to diagnose heart vitality. It provides information about the contraction ability of the myocardium. Two-dimensional color Doppler echocardiography is still the most important clinical method for estimation of morphology and function. Two-dimensional methods leads to a lack of information due to the three-dimensional overall nature of the heart movement. Due to this complex three-dimensional motion pattern of the heart, the knowledge about velocity and strain rate distribution over the whole ventricle can provide more valuable diagnostic information about motion disorders. For the assessment of intracardiac blood flow three-dimensional color Doppler has already shown its clinical utility. We have developed methods to produce strain rate images by means of 3D tissue Doppler echocardiography. The tissue Doppler and strain rate images can be visualized and quantified by different methods. The methods are integrated into an interactively usable software environment, making them available in clinical everyday life. Our software provides the physician with a valuable tool for diagnosis of heart wall motion.

  2. Diagnosis of Rupture of Mitral Chordae Tendinese by Color Doppler Eehocardiogrphy%二尖瓣腱索断裂的彩色多普勒超声心动图诊断

    Institute of Scientific and Technical Information of China (English)

    侯传举; 邓东安; 张玉威; 张仁福

    1996-01-01

    In 6016 patients of different cardiovascular diseases operated,5 cases with rupture of mitral chordae tendineae(RMCT)were detected by color Doppler eehocardiography(CDE).The accuracy rate of CDE was 100%.The ultrasonic manifeslations of RMCT in CDE were"flail shape" change of the mitral leaflets with ruptued ehordae tendineae in two-dimensional echocardiography (2DE)and a shade of multi-colored resurgitated jet of blood through mitral valve during systol in CDE.It is concluded that CDE has specific value in the diagnosis of RMCT and can replace the angiocardiography.It is necessary to differentiate RMCT from mitral valve prolapse(MVP)and mitral valve vegetation(MVV)by CDE.Surgical treatment should be done as soon as the diagnosis of RMCT iS confirmed.%应用彩色多普勒超声心动图(CDE)在已手术的6016例各种心血管疾病中检出5例二尖瓣腱索断裂(RMCT),CDE诊断准确率100%.本病的CDE表现是两维超声心动图(2DE)显示腱索断裂的二尖瓣叶呈"槤枷样"或"甩鞭样"改变,彩色多普勒(CD)显示收缩期过二尖瓣五彩相间返流束血流信号.结果表明CDE对本病有特异性诊断价值,可代替心血管造影检查.CDE诊断本病需与二尖瓣脱垂(MVP)和二尖瓣叶赘生物(MVV)相鉴别.一旦确诊应及早手术治疗.

  3. Role of color Doppler US in the evaluation of uterine leiomyoma treated with gonadotrophin-releasing hormone (GnRH) agonist (Zoladex)

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jung Sik; Sohn, Cheol Ho; Lee, Tae Sung [Keimyung University Dongsan Medical Center, Taegu (Korea, Republic of)

    1999-03-15

    To access the role of color Doppler US in the evaluation of uterine leiomyoma treated with GnRH agonist (Zoladex). Out of 25 patients with uterine leiomyoma treated with Zoladex, nineteen cases of leiomyoma in 18 women who had US examination before and after medication were included in this study. Zoladex was injected subcutaneously three times within three months. Both gray scale and color Doppler US were obtained before and 1-3 months after the medication. The size, volume, location and internal echoes of the leiomyoma were recorded with gray scale US. Changes in the amount of color signal within leiomyomas were recorded. Pulsatility index (PI), resistive index (RI), peak systolic velocity (PSV) of both uterine artery and arteries within leiomyomas were also recorded. The image findings of good response group and poor response group in which the volume reduction of the leiomyoma was above or below 50% respectively were compared with each other. The reduction of the volume of leiomyoma was compared between a group with decrease in the amount of color signals during follow-up US and a group with increase or no change. Mean reduction of the volume of leiomyomas was 52%. Changes in the amount of color signals of the leiomyoma, PI, RI, PSV obtained from the arteries within leiomyomas were not correlated with the change of the volume of leiomyomas. PSV of uterine artery in one month follow-up and PI of two month follow-up were correlated with the changes of the volume of leiomyomas (p<0.05). RI of uterine artery in two month follow-up was useful in prediction of the good response group and the poor response group (p<0.05). The prediction of the volume reduction of leiomyoma following Zoladex medication might be possible by obtaining RI of uterine artery in two month follow-up. Doppler US of the arteries within the leiomyoma was not useful.

  4. [Calculation of the mitral valve area with the proximal convergent flow method with Doppler-color in patients with mitral stenosis].

    Science.gov (United States)

    Aguilar, J A; Summerson, C; Flores, D; Espinosa, R A; Enciso, R; Badui, E; Hurtado, R

    1994-01-01

    In this study we evaluate prospectively a new color Doppler method for calculating the mitral valve area based on identifying a blue-red aliasing interfase proximal to the orifice, corresponding to the flow convergence region (FCR). This method can be used to calculate areas using the continuity equation. We studied 61 patients with stenosis. The mitral valve area was calculated using pressure half-time (PHT) Doppler method which were compared with values that obtained by the FCR method, according to the following formula. AVM (cm2) = 2 pi r2 x VN/Vmax; where "r" is the FCR radius measured from the orifice to the first color aliasing (blue-red interface); VN is Nyquist velocity and Vmax is the peak flow velocity by continuous wave Doppler. Twenty three patients had pure mitral stenosis and 38 double mitral lesion. Twenty patients were on sinus rhythm while 41 in atrial fibrillation. Calculated mitral valve area using the FCR method correlated well with mitral valve area determined by PHT method at a correlation coefficient of r = 0.96 (y = 0.097 x + 54.9, SEE = 0.10 cm2, p < 0.001). MVA by FCR ranged from 0.4 to 2.5 cm2 (mean = 1.19 cm2). MVA by PHT ranged from 0.42 to 2.48 cm2 (mean = 1.15 cm2). Color Doppler FCR method provides an accurate estimate of effective mitral valve area and may be useful as an alternative to the pressure half-time method. The calculated mitral valve area by the FCR method is not influenced by the presence of mitral regurgitation nor atrial fibrillation.

  5. QUANTITATIVE ANALYSIS ON CHANGES OF HEPATIC HEMODYNAMICS AFTER TRANSCUTANEOUS ELECTRIC PULSE STIMULATION OF LOCAL POINTS BY USING COLOR DOPPLER ULTRASOUND DIAGNOSTIC APPARATUS

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jun-chang; WANG Ling; LI Hong; LI Jun; ZHANG Yun

    2006-01-01

    Objective: To evaluate the effect of transcutaneous electric pulse stimulation (TEPS) on hepatic blood flow and parenchymal microcirculation in patients with fatty liver. Methods: A total of 31 fatty liver volunteer patients were observed in this study. Changes of color Doppler energy (CDE) images before and after TEPS of local points nearby the liver were recorded by using color Doppler ultrasound diagnostic apparatus (ACUSON 128XP/10C). Sum of color pixel area (SCPA), average of color value (ACV) and SCPA×ACV (integral) of the hepatic flow images were analyzed by an image processing system, single blind method and paired t-test. Programmed TEPS (0.5- 150 Hz/2 000 Hz, 10-25 V) was applied to the right Qimen (期门LR 14)-Jingmen (京门GB 25), Fuai (腹哀 SP 16)-Ganshu (肝俞 BL 18) respectively for 15 min. Results:Compared with basic values of pretreatment, SCPA, ACV and SCPA×ACV increased significantly ( t = 2.71,P<0.02; t=3.42, P<0.01; and t=8.15, P<0.001 ) after TEPS, meaning improvement of hepatic blood flow supply. Conclusion: TEPS of acupoints near the liver can improve hepatic blood flow and hepatic parenchyrnal microcirculation in patients with fatty liver.

  6. Longitudinal two dimensional strain rate imaging is superior to tissue Doppler imaging in predicting echocardiographic response in cardiac resynchronization therapy%二维斑点追踪显像技术预测心脏再同步治疗的疗效

    Institute of Scientific and Technical Information of China (English)

    史浩颖; 舒先红; 汪芳; 陈灏珠; 刘少稳

    2009-01-01

    Objective The aim of this study was to investigate the ability of longitudinal strain and strain rate imaging by two dimensional speckle tracking in predicting echocardiographic response under cardiac resynchronization therapy (CRT),in comparison with tissue Doppler imaging (TDI). Methods Fifty patients suffering from heart failure,who received CRT,were selected. TDI and two dimensional speckle tracking ima ging in addition to standard echocardiography were performed prior to CRT. The average value of peak longitu dinal strain in 12 left ventricular (LV) segments (Strain-12), the standard deviation of time to peak longitudinal strain in 12 LV segments (Tstrain-SD) and the standard deviation of time to the end of longitudinal systolic strain rate in 6 basal LV segments (Tsr-SD) were calculated. Patients were classified as echocardiographic re sponders if the LV end-systolic volume (LVESV) was reduced > 15% compared with baseline volumes. Re sults No significant difference was seen in baseline Ts-SD,Strain-12 and Tstrain-SD between nonresponders and responders. However, the Tsr-SD was much higher in responders than nonresponders[ (95. 9 ±33. 0)% vs (64. 8 ±39. 6)%,P15%或左心室射血分数(LVEF)绝对值增加>5%的患者.结果 CRT有效组起搏前左心室射血前时间显著长于无效组[(146.0±34.5)ms对(123.5±32.0)ms,P0.05),而CRT有效组的应变率结束时间标准差(Tsr-SD)显著高于无效组(P0.05),而CRT有效组的左心室12节段纵轴反向应变总和(Pstrain-12)显著高于无效组[(12.5±7.9)%对(7.1±8.4)%,P<0.05].将140.5 ms作为截点值,左心室射血前时间预测超声心动图有效的敏感性和特异性分别为63%和79%,将70.7 ms作为截点值,Tsr-SD预测CRT有效的敏感性和特异性分别为73%和65%.结论 常规超声心动图参数中仅左心室射血前时间能预测CRT疗效,二维斑点追踪显像技术的部分参数预测CRT疗效优于组织多普勒.

  7. Evaluation of varicocele frequency of patients with spinal cord injury by color Doppler ultrasonography: A new etiological factor for varicocele?

    Energy Technology Data Exchange (ETDEWEB)

    Unsal, Alparslan [Adnan Menderes University, Faculty of Medicine, Department of Radiology, 09100 Aydin (Turkey)]. E-mail: aunsal@adu.edu.tr; Yilmaz, Bilge [Turkish Armed Forces Rehabilitation and Care Center, Department of Physical Medicine and Rehabilitation, Bilkent, Ankara (Turkey); Turgut, Ahmet Tuncay [Ankara Training and Research Hospital, Department of Radiology, Ankara (Turkey); Taskin, Fuesun [Adnan Menderes University, Faculty of Medicine, Department of Radiology, 09100 Aydin (Turkey); Alaca, Ridvan [Turkish Armed Forces Rehabilitation and Care Center, Department of Physical Medicine and Rehabilitation, Bilkent, Ankara (Turkey); Karaman, Can Zafer [Adnan Menderes University, Faculty of Medicine, Department of Radiology, 09100 Aydin (Turkey)

    2006-01-15

    Purpose: To evaluate the varicocele frequency of patients with spinal cord injury by color Doppler ultrasonography. Materials and methods: Sixty patients {l_brace}48 patients with upper motor neuron injury (U-MNI) and 12 patients with lower-MNI{r_brace} with traumatic spinal cord injury and age matched 48 healthy volunteers were enrolled in this prospective study. Testis volumes and varicocele grades were determined. Presence of varicocele was also classified according to clinical significance. Results: Testis volumes of U-MNI sub-group (14.81 {+-} 4.74 ml) were significantly smaller than the control group (18.20 {+-} 4.52 ml, p = 0.000) and L-MNI sub-group (17.88 {+-} 3.23 ml, p = 0.008). No left-sided clinical varicocele was found in L-MNI sub-group (0/12, 0%), whereas there were 14 patients in control group (14/48, 29%) and 7 patients in U-MNI sub-group (7/47, 15%), and the difference was statistically significant (p = 0.000, 0.007, respectively). Conclusion: Clinical varicocele frequency of U-MNI patients, who have spastic paralysis of abdominal and lower extremity muscles, is similar to the control group. This finding inspires that increased intra-abdominal pressure via normal to increased abdominal muscle tonus may have a role in the varicocele etiology, beside the classical factors. Absence of clinical varicocele in L-MNI patients, who have flaccid paralysis of the same muscle groups, supports this observation.

  8. Short-term effects of intravitreal triamcinolone acetonide injection on ocular blood flow evaluated with color Doppler ultrasonography

    Institute of Scientific and Technical Information of China (English)

    Mustafa; Alpaslan; Anayol; Yasin; Toklu; Elif; Asik; Kamberoglu; Sabri; Raza; Hasan; Basri; Arifoglu; Huseyin; Simavli; Ayse; Gul; Kocak; Altintas; Saban; Simsek

    2014-01-01

    AIM:To evaluate the changes in ocular blood flow with color Doppler ultrasonography(CDU) after intravitreal triamcinolone acetonide(IVTA) injection.METHODS:A total of 46 patients who underwent IVTA(4 mg/0.1 mL) injection for diabetic macular edema(DME)(n =22), central retinal vein occlusion(CRVO)(n =12) and choroidal neovascular membrane(CNVM)(n =12) were included in the study. Peak systolic velocity(PSV), end diastolic velocity(EDV) and resistivity index(RI) were measured from the ophthalmic artery(OA), the central retinal artery(CRA) and the posterior ciliary artery(PCA)of each patient with CDU before, at the end of the first week and at the end of the first month following IVTA injection.RESULTS:In the DME group, PSV of OA at the first of the first month(mean ±SD)(37.48 ±10.87 cm/s) increased compared to pre-injection value(31.39 ±10.84 cm/s)(P =0.048). There was a statistically significant decrease(P =0.049) in PSV of CRA at the end of the first month(7.97±2.67 cm/s) compared to the pre-injection(9.47±3.37 cm/s).There was not any statistically significant difference onthe other parameters in the DME group. Also, there was not any statistically significant difference on the ocular blood flow values in the CRVO and CNVM groups.CONCLUSION:We observed that 4 mg/0.1 mL IVTA increased PSV of OA and decreased PSV of CRA in DME patients and did not have any effect on ocular blood flow values of CRVO and CNVM patients.

  9. Value of sagittal color Doppler ultrasonography as a supplementary tool in the differential diagnosis of fetal cleft lip and palate

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Myoung Seok [Dept. of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul (Korea, Republic of); Cho, Jeong Yeon; Kim, Sang Youn; Kim, Seung Hyup [Dept. of Radiology, Seoul National University Hospital, Seoul (Korea, Republic of); Park, Joong Shin; Jun, Jong Kwan [College of Medicine, Seoul National University, Seoul (Korea, Republic of)

    2017-01-15

    The purpose of this study was to evaluate the feasibility and usefulness of sagittal color Doppler ultrasonography (CDUS) for the diagnosis of fetal cleft lip (CL) and cleft palate (CP). We performed targeted ultrasonography on 25 fetuses with CL and CP, taking coronal and axial images of the upper lip and maxillary alveolar arch in each case. The existence of defects in and malalignment of the alveolus on the axial image, hard palate defects on the midsagittal image, and flow-through defects on CDUS taken during fetal breathing or swallowing were assessed. We compared the ultrasonography findings with postnatal findings in all fetuses. Alveolar defects were detected in 16 out of 17 cases with CP and four out of eight cases with CL. Alveolar malalignment and hard palate defects were detected in 11 out of 17 cases and 14 out of 17 cases with CP, respectively, but not detected in any cases with CL. Communicating flow through the palate defect was detected in 11 out of 17 cases of CL with CP. The accuracy of detection in axial scans of an alveolar defect and malalignment was 80% and 76%, respectively. Accuracy of detection of in mid-sagittal images of hard palate defect and flow was 80% and 86%, respectively. The overall diagnostic accuracy of combined axial and sagittal images with sagittal CDUS was 92%. Sagittal CDUS of the fetal hard palate is a feasible method to directly reveal hard palate bony defects and flow through defects, which may have additional value in the differential diagnosis of fetal CL and CP.

  10. Short-term effects of intravitreal triamcinolone acetonide injection on ocular blood flow evaluated with color Doppler ultrasonography

    Directory of Open Access Journals (Sweden)

    Mustafa Alpaslan Anayol

    2014-10-01

    Full Text Available AIM:To evaluate the changes in ocular blood flow with color Doppler ultrasonography (CDU after intravitreal triamcinolone acetonide (IVTA injection.METHODS: A total of 46 patients who underwent IVTA (4 mg/0.1 mL injection for diabetic macular edema (DME (n=22, central retinal vein occlusion (CRVO (n=12 and choroidal neovascular membrane (CNVM (n=12 were included in the study. Peak systolic velocity (PSV, end diastolic velocity (EDV and resistivity index (RI were measured from the ophthalmic artery (OA, the central retinal artery (CRA and the posterior ciliary artery (PCA of each patient with CDU before, at the end of the first week and at the end of the first month following IVTA injection.RESULTS:In the DME group, PSV of OA at the first of the first month (mean±SD (37.48±10.87 cm/s increased compared to pre-injection value (31.39±10.84 cm/s (P=0.048. There was a statistically significant decrease (P=0.049 in PSV of CRA at the end of the first month (7.97±2.67 cm/s compared to the pre-injection (9.47±3.37 cm/s. There was not any statistically significant difference on the other parameters in the DME group. Also, there was not any statistically significant difference on the ocular blood flow values in the CRVO and CNVM groups.CONCLUSION: We observed that 4 mg/0.1 mL IVTA increased PSV of OA and decreased PSV of CRA in DME patients and did not have any effect on ocular blood flow values of CRVO and CNVM patients.

  11. Color Doppler imaging features in patients presenting central retinal artery occlusion with and without giant cell arteritis

    Directory of Open Access Journals (Sweden)

    Catalin Jianu Dragos

    2016-01-01

    Full Text Available Introduction. Central retinal artery obstruction (CRAO represents an abrupt diminution of blood flow through the CRA that is severe enough to cause ischemia of the inner retina with permanent unilateral visual loss. We presented the role of color Doppler imaging (CDI of orbital vessels and of extracranial duplex sonography (EDS in the etiological diagnosis of CRAO in two patients with clinical suspicion of unilateral CRAO. Case report. Patients were examined following the protocol which included CDI of orbital vessels and EDS. Both patients had no emboli visible on ophthalmoscopy. The B-scan ultrasound evaluation of the first patient found a small round, moderately reflective echo within the right optic nerve, 1.5 mm behind the optic disc (emboli of cholesterol. CDI of retrobulbar vessels revealed the normal right ophthalmic artery (OA hemodynamic parameters, but the first patient had no arterial flow signal on CDI at the distance of 1.5 mm behind the right optic disc. In contrast, the left eye had the normal aspect on CDI of retrobulbar vessels. The right internal carotid artery EDS identified a severe stenosis at its origin as CRA’s emboli source. The second patient had characteristic CDI findings for giant cell arteritis (GCA with eye involvement: severe diminished blood flow velocities, especially end-diastolic velocities, in both CRAs. Less abnormalities were observed in the posterior ciliary arteries, and in the ophthalmic arteries. The second patient had no systemic symptoms or signs of GCA. Conclusion. In the presented cases, the ultrasound investigation enabled prompt differentiation between central retinal artery occlusion of embolic mechanism and CRAO caused by GCA.

  12. Strongly interacting two-dimensional Dirac fermions

    NARCIS (Netherlands)

    Lim, L.K.; Lazarides, A.; Hemmerich, Andreas; de Morais Smith, C.

    2009-01-01

    We show how strongly interacting two-dimensional Dirac fermions can be realized with ultracold atoms in a two-dimensional optical square lattice with an experimentally realistic, inherent gauge field, which breaks time reversal and inversion symmetries. We find remarkable phenomena in a temperature

  13. Topology optimization of two-dimensional waveguides

    DEFF Research Database (Denmark)

    Jensen, Jakob Søndergaard; Sigmund, Ole

    2003-01-01

    In this work we use the method of topology optimization to design two-dimensional waveguides with low transmission loss.......In this work we use the method of topology optimization to design two-dimensional waveguides with low transmission loss....

  14. Ratio of left ventricular peak E-wave velocity to flow propagation velocity assessed by color M-mode Doppler echocardiography in first myocardial infarction

    DEFF Research Database (Denmark)

    Møller, J E; Søndergaard, E; Seward, J B;

    2000-01-01

    OBJECTIVES: To determine the ability of the ratio of peak E-wave velocity to flow propagation velocity (E/Vp) measured with color M-mode Doppler echocardiography to predict in-hospital heart failure and cardiac mortality in an unselected consecutive population with first myocardial infarction (MI......). BACKGROUND: Several experimental studies indicate color M-mode echocardiography to be a valuable tool in the evaluation of diastolic function, but data regarding the clinical value are lacking. METHODS: Echocardiography was performed within 24 h of arrival at the coronary care unit in 110 consecutive...... or =1.5 measured with color M-mode echocardiography is a strong predictor of in-hospital heart failure. Furthermore, E/Vp is superior to systolic measurements in predicting 35 day survival although Dt

  15. Evaluation the index of ophthalmic arteries in diabetic patients with retinopathy compared to diabetic patients without retinopathy using color Doppler ultrasound

    Directory of Open Access Journals (Sweden)

    Mohammad Ghasem Hanafi

    2016-12-01

    Full Text Available Diabetic retinopathy is the most common eye complication in diabetic patients that early detection of this complication is essential. The aim of this study was to evaluate ophthalmic artery index in diabetic retinopathy by Doppler ultrasound. . In this cross-sectional study, 64 patients were studied in 4 groups (healthy, diabetic without retinopathy, background retinopathy and proliferative retinopathy. Resistance index (RI and Pulsatile Index (PI were assessed by color Doppler ultrasound. The obtained data were analyzed by ANOVA and chi-square test and ROC curve. RI in diabetic patients with proliferative retinopathy has the highest mean (0.83 and the lowest mean was observed in healthy subjects (0.54 (P <0.001 as well as in PI, the highest rate was in diabetic patients with proliferative retinopathy (1.41 and the lowest was in healthy subjects (0.92 (P <0.001. The results of our study showed that the sensitivity, specificity, positive and negative predictive values and overall accuracy of RI and PI in diabetic patients with proliferative retinopathy in the best cut-off points (0.645 and 1.0175 respectively were 100%.Ophthalmic artery index RI and PI was significantly increased in patients with diabetic retinopathy and the sensitivity and specificity for detection retinopathy was 100%. Color Doppler ultrasound method is more efficient for screening diabetic patients with retinopathy.

  16. Avaliação com Doppler colorido e espectral da veia porta de cães Evaluation of portal vein in dogs by color and spectral Doppler imaging

    Directory of Open Access Journals (Sweden)

    Raquel Sartor

    2009-04-01

    Full Text Available A perfusão total do fígado e suas contribuições relativas, pelo sistema portal e pela artéria hepática, podem estar alteradas por vários processos hepáticos, como doença hepato-celular difusa, neoplasia e shunts intra-hepáticos. O estudo do comportamento do fluxo sangüíneo nos vasos do fígado por meio da ultra-sonografia Doppler tem demonstrado que este é um método viável não-invasivo e de grande auxílio, principalmente na avaliação da hemodinâmica portal. São duas as modalidades de ultra-sonografia Doppler com maior aplicação na rotina para avaliação de fluxo nos vasos abdominais, o Doppler espectral e o Doppler colorido. Na doença hepática crônica, ocorre alteração da complacência hepática devido à fibrose ou à cirrose, as quais acarretam alterações vasculares, levando ao aumento da pressão venosa portal. As principais indicações desse exame são os casos em que há suspeita de hipertensão portal. A hemodinâmica portal é avaliada pela mensuração de sua área, da velocidade média, do volume de fluxo no vaso e do índice de congestão portal. Esta revisão de literatura tem como objetivo descrever os princípios físicos básicos da ultra-sonografia Doppler e sua aplicação na avaliação da hemodinâmica portal nos cães.Total hepatic perfusion by portal system and hepatic arteria as well as its respective average contributions, can be affected for several hepatic processes, such as diffuse liver disease, neoplasm and intrahepatic shunts. Blood flow exams of the liver vessels using Doppler ultrasonography, appeared as a viable, non-invasive and helpful diagnostic method for the hemoportal dynamic evaluation. There are two Doppler ultrasonographic modalities most frequently used in routine for evaluation of the abdominal vessels flow, spectral Doppler imaging and color-flow Doppler imaging. In chronic liver disease, alteration of hepatic complacency occurs because of either fibrosis or cirrhosis

  17. Color Doppler sonography with contrast in the differentiation of ovarian tumors Ultra-sonografia com Doppler colorido e uso de contraste na diferenciação dos tumores ovarianos

    Directory of Open Access Journals (Sweden)

    Eduardo Cardoso Blanco

    2003-01-01

    Full Text Available The objective of this study was to differentiate benign ovarian tumors from malignant ones before surgery using color and pulsed Doppler sonography, and to compare results obtained before and after use of contrast medium, thereby verifying whether contrast results in an improvement in the diagnostic sensitivity. METHODS: Sixty two women (mean age 49.9 years with ovarian tumors were studied, 45 with benign and 17 with malignant tumors. All women underwent a transvaginal color Doppler ultrasonographic exam. A study of the arterial vascular flow was made in all tumor areas, as well as an impedance evaluation of arterial vascular flow using the resistance index. RESULT: Localization of the vessels in the tumor revealed a greater proportion of malignant tumors with detectable internal vascular flows (64% than benign tumors with such flows (22%. There was a considerable overlap of these findings. The use of contrast identified a greater number of vessels with confirmation in the totality of tumors, but did not improve the Doppler capacity in tumoral differentiation. Malignant tumors presented lower values of resistance index than the benign ones, whether or not contrast was used. The cutoff value for resistance index that better maximized the Doppler sensitivity and specificity was 0.55. Through this value, an increase of the sensitivity after contrast use was obtained, varying from 47% to 82%, while specificity remained statistically unchanged. CONCLUSION: Although the injection of a microbubble agent improved the sensitivity of the method detecting vascularization of tumors, a positive finding for vascularization by this method was not clinically useful in the differentiation of benign and malignant ovarian tumors.O objetivo deste estudo foi diferenciar tumores ovarianos benignos e malignos antes da cirurgia através da ultra-sonografia com uso de Doppler colorido pulsátil e comparar os resultados obtidos antes e após o uso de contraste. M

  18. 附睾精子肉芽肿二维彩色多普勒超声诊断价值%Two-dimensional and Color Doppler Diagnosis of Spermatic Granuloma

    Institute of Scientific and Technical Information of China (English)

    符海; 陆萍

    2000-01-01

    目的:探讨二维彩色多普勒超声(2D-CDU)对附睾精子肉芽肿(SG)的诊断价值.方法:应用2D-CDU检查了18例经手术、病理证实的SG患者, 结合病检对超声诊断结果进行了分析.结果:SG二维图像分为三型:低回声型、高回声型及中等回声型, 以低回声型居多, 占11例.声像图表现主要与肿块纤维组织成分多少有关.彩色多普勒超声(CDU)示肿块血流呈低速低阻血流.文中讨论了SG声像图特征并提出与附睾结核、精液囊肿及附睾肿瘤等的鉴别诊断要点.结论:超声对SG是一种有价值的检查方法, 可列为首选.

  19. Two Dimensional Plasmonic Cavities on Moire Surfaces

    Science.gov (United States)

    Balci, Sinan; Kocabas, Askin; Karabiyik, Mustafa; Kocabas, Coskun; Aydinli, Atilla

    2010-03-01

    We investigate surface plasmon polariton (SPP) cavitiy modes on two dimensional Moire surfaces in the visible spectrum. Two dimensional hexagonal Moire surface can be recorded on a photoresist layer using Interference lithography (IL). Two sequential exposures at slightly different angles in IL generate one dimensional Moire surfaces. Further sequential exposure for the same sample at slightly different angles after turning the sample 60 degrees around its own axis generates two dimensional hexagonal Moire cavity. Spectroscopic reflection measurements have shown plasmonic band gaps and cavity states at all the azimuthal angles (omnidirectional cavity and band gap formation) investigated. The plasmonic band gap edge and the cavity states energies show six fold symmetry on the two dimensional Moire surface as measured in reflection measurements.

  20. Two-dimensional function photonic crystals

    Science.gov (United States)

    Liu, Xiao-Jing; Liang, Yu; Ma, Ji; Zhang, Si-Qi; Li, Hong; Wu, Xiang-Yao; Wu, Yi-Heng

    2017-01-01

    In this paper, we have studied two-dimensional function photonic crystals, in which the dielectric constants of medium columns are the functions of space coordinates , that can become true easily by electro-optical effect and optical kerr effect. We calculated the band gap structures of TE and TM waves, and found the TE (TM) wave band gaps of function photonic crystals are wider (narrower) than the conventional photonic crystals. For the two-dimensional function photonic crystals, when the dielectric constant functions change, the band gaps numbers, width and position should be changed, and the band gap structures of two-dimensional function photonic crystals can be adjusted flexibly, the needed band gap structures can be designed by the two-dimensional function photonic crystals, and it can be of help to design optical devices.

  1. Two-Dimensional Planetary Surface Lander

    Science.gov (United States)

    Hemmati, H.; Sengupta, A.; Castillo, J.; McElrath, T.; Roberts, T.; Willis, P.

    2014-06-01

    A systems engineering study was conducted to leverage a new two-dimensional (2D) lander concept with a low per unit cost to enable scientific study at multiple locations with a single entry system as the delivery vehicle.

  2. 4-Dimensionally Guided 3-Dimensional Color-Doppler Ultrasonography Quantifies Carotid Artery Stenosis With High Reproducibility and Accuracy.

    Science.gov (United States)

    Macharzina, Roland Richard; Kocher, Sascha; Messé, Steven R; Rutkowski, Thomas; Hoffmann, Fabian; Vogt, Matthias; Vach, Werner; Fan, Nian; Rastan, Aljoscha; Neumann, Franz-Josef; Zeller, Thomas

    2017-07-13

    The purpose was to analyze the agreement and binary accuracy of the degree of internal carotid artery stenosis (ICAS) as determined by 4-dimensionally (4D) real-time gray-scale guided 3-dimensional (3D) color-Doppler ultrasonography (3DC-US) (4D/3DC-US) compared with catheter angiography (CA) and duplex ultrasonography (DUS). This study hypothesized that 4D/3DC-US is noninferior to CA and DUS in grading ICAS in selected patients. Clinical stratification in patients with ICAS largely depends on a patient's symptomatic status and the degree of stenosis. Screening with 4D/3DC-US was prospectively performed in 93 study patients (with 122 ICASs), thus yielding 80 patients for analysis (with 103 ICASs) after excluding patients with insufficient image quality, previous revascularization, and contraindications to CA. The ultrasound examination (10 MHz) consisted of consensus conform DUS examination and independent real-time 4D-guided gray-scale views for orientation followed by static 3DC-US NASCET (North American Symptomatic Carotid Endarterectomy Trial) percent stenosis quantification using off-line multiplanar rendering. Multiplanar selective CA of the same ICASs was quantified with dedicated software in a blinded fashion. Quantitative CA of 103 stenoses with a mean degree of 65 ± 17% was compared with 4D/3DC-US, with a resulting concordance correlation coefficient of 0.89 and a standard deviation of differences (SDD) of 8.1% at a bias of +1.7%. Binary 50% and 70% stenosis detection with 4D/3DC-US revealed a sensitivity of 97% and 87%, respectively, and a specificity of 92% and 84%, respectively. Interobserver SDD for CA of 52 stenoses (7.2%) did not differ from SDD for 4D/3DC-US and CA (p = 0.274). Accuracy of 50% stenosis detection by 4D/3DC-US was tendentially higher compared with DUS (96% vs. 91%). The 4D/3DC-US method provides reliable and accurate stenosis quantification and binary classification with good diagnostic accuracy compared with CA and DUS. Copyright

  3. Assessment of Uterine Receptivity by Endometrial and Subendometrial Blood Flows Measured by Vaginal Color Doppler Ultrasound in Women Undergoing IVF Treatment

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Obiective To evaluate endometrial and Subendometrial blood flows measured by vaginal color Doppler ultrasound as a predicator of endometrial receptivity in women undergoing IVF treatment.Methods A total of 119 infertile patients undergoing the first IVF/ICSI-ET cycle were recruited.Three groups were divided according to a color Doppler ultrasound examination performed on the day of hCG injection.Group A,endometrial and subendometrial blood flows were 2 branches and below,group B,endometrial and subendometrial blood flows were between 3 and 4 branches;group C, endometrial and subendometrial blood flows were 5 branches and above.Patients were transferred 1-3 embryos each.Demographic data,ovarian responses.endometrial thickness,PI,RI,development of embryo and IVF result among groups were compared.Results Demographic data,ovarian responses,endometrial thickness,PI,RI and development of embryo among groups have no significant difference.The pregnancy rate of group A was significantly lower than that of group B(P<0.05) and group C(P<0.01).The implantation rate of group A was significantly lower than than of group C (P<0.01).There was no significant difference of the rate of pregnancy and implantation between group B and group C (P>0.05).Conclusion Endometrial and subendometrial blood flows measured by vaginal color Doppler ultrasound is a good predicator of pregnancy during IVF treatment.A good endometrial and subendometrial blood flows is benefit for the result of IVF.

  4. Assessment value of blood flow velocity and resistance index detection by transvaginal color Doppler ultrasound on effect of neoadjuvant chemotherapy for ovarian cancer

    Institute of Scientific and Technical Information of China (English)

    You-Bin Fan

    2016-01-01

    Objective:To analyze the assessment value of blood flow velocity and resistance index detection by transvaginal color Doppler ultrasound on effect of neoadjuvant chemotherapy for ovarian cancer.Methods:A total of 78 cases of ovarian cancer patients receiving treatment in our hospital from September 2012 to May 2014 were included for study, all patients received neoadjuvant chemotherapy, and before and after treatment, transvaginal color Doppler ultrasound (TVCDU) was used to record resistance index (RI) and pulsatility index (PI), the expression levels of serum tumor markers, illness-related indicators and apoptosis-related factors in circulating blood were detected, and the correlation between TVCDU monitoring indexes and ovarian cancer-related indicators was further analyzed.Results: PI value (1.13±0.12) and RI value (0.65±0.05) of ovarian cancer patients after treatment were significantly higher than PI value (0.72±0.06) and RI value (0.32±0.03) of ovarian cancer patients before treatment; serum HE4, CA153, CA125 and毬-HCG levels of ovarian cancer patients after treatment were lower than those before treatment; serum MSLN, CCL-18, FS, CL and Hpa levels of ovarian cancer patients after treatment were lower than those before treatment; after ovarian cancer patients received neoadjuvant chemotherapy, ADM, HIF-1毩, PCNA and bcl-2 gene expression levels were lower than those before treatment; RI and PI values of ovarian cancer patients were inversely proportional to the expression levels of HE4, CA153, CA125,毬-HCG, MSLN, CCL-18, FS, CL, Hpa, ADM, HIF-1毩, PCNA and bcl-2. Conclusion:Blood flow velocity and resistance index detection by transvaginal color Doppler ultrasound can be used as a highly efficient means to evaluate the effect of neoadjuvant chemotherapy for ovarian cancer, and it has positive significance in judging disease severity, guiding treatment and other aspects.

  5. Transient basilar artery occlusion monitored by transcranial color Doppler presenting with a spectacular shrinking deficit: a case report

    Directory of Open Access Journals (Sweden)

    Del Sette Massimo

    2010-01-01

    Full Text Available Abstract Introduction We describe the case of a 79-year-old Caucasian Italian woman with a transient basilar occlusion monitored by transcranial Doppler, with subsequent recanalization and clinical shrinking deficit. This is the first case of transient basilar occlusive disease diagnosed and monitored by transcranial Doppler. This case is important and needs to be reported because transient basilar occlusion may be easily diagnosed if transcranial Doppler is performed. Case presentation A 79-year-old woman affected by chronic atrial fibrillation and not treated with oral anticoagulants, cardioverted to sinus rhythm during a gastric endoscopy. She then showed a sudden-onset loss of consciousness, horizontal and vertical gaze palsy, tetraparesis and bilateral miosis and coma. Two hours later, the symptoms resolved quickly, leaving no residual neurologic deficits. Transcranial Doppler examination showed a dampened flow in the basilar artery in the emergency examination and a restored flow when the symptoms resolved. Conclusion This is the first case of transient basilar occlusive disease diagnosed and monitored by transcranial Doppler. We believe that transcranial Doppler should be performed in all cases of unexplained acute loss of consciousness, in particular, if associated with signs of brainstem dysfunctions.

  6. Clinical value of transvaginal color Doppler ultrasound in diagnosis of ectopic pregnancy%阴道彩超诊断异位妊娠的临床价值

    Institute of Scientific and Technical Information of China (English)

    刘华; 张卉

    2012-01-01

    目的 探讨经阴道彩超检查对早期异位妊娠的诊断价值.方法 对226例经阴道超声检查诊断为早期异位妊娠的超声声像图和临床资料进行回顾性分析.结果 226例经阴道超声检查诊断为异位妊娠的病例,218例与临床及病理诊断符合,诊断符合率为96.4%,漏诊率为1.77% (4/226),误诊率为1.77%(4/226).结论 经阴道彩超诊断异位妊娠技术操作简单,图像显示清晰,对异位妊娠的检出率非常高.同时对异位妊娠发生的部位定位较准确,对病变的进展程度也可作出相应的评价.%[Objective]To explore the diagnostic value of transvaginal color Doppler ultrasound examination for early ectopic pregnancy. [Methods] The ultrasound images and clinical data of 226 early ectopic pregnancy cases diagnosed by transvaginal color Doppler ultrasound were analyzed retrospectively. [ Results ] Among 226 early ectopic pregnancy cases diagnosed by transvaginal color Doppler ultrasound, 218 cases accorded with the clinical and pathological diagnosis, the diagnostic accordance rate was 96.4% , the rate of missed diagnosis was 1.77% (4/226), and the rate of misdiagnosis was 1.77% (4/226). [Conclusion] The transvaginal color Doppler ultrasound in diagnosis of ectopic pregnancy has the advantages of simple operation, clear image display and high detection rate. Meanwhile, it can accurately determine the position of ectopic pregnancy, and make an appropriate evaluation on degree of disease.

  7. Global testicular infarction in the presence of epididymitis: clinical features, appearances on grayscale, color Doppler, and contrast-enhanced sonography, and histologic correlation.

    Science.gov (United States)

    Yusuf, Gibran; Sellars, Maria E; Kooiman, Gordon G; Diaz-Cano, Salvador; Sidhu, Paul S

    2013-01-01

    Epididymitis is common, presenting indolently with unilateral scrotal pain and swelling. Diagnosis is based on clinical assessment and resolves with antibiotic therapy. Recognized complications are abscess formation and segmental infarction. Global testicular infarction is rare. Diagnosis is important and requires surgical management. On grayscale sonography, global infarction may be difficult to establish. The addition of color Doppler imaging is useful but is observer experience dependent with limitations in the presence of low flow. Contrast-enhanced sonography is useful for unequivocally establishing the diagnosis. We report global testicular infarction in 2 patients with epididymitis clearly depicted on contrast-enhanced sonography, allowing immediate surgical management.

  8. SAR processing based on the exact two-dimensional transfer function

    Science.gov (United States)

    Chang, C. Y.; Jin, M. Y.; Curlander, J. C.

    1992-01-01

    The two-dimensional transfer functions of several synthetic aperture radar (SAR) focusing algorithms are derived considering the spaceborne SAR environments. The formulation includes the factors of the earth rotation and the antenna squint angles. The resultant transfer functions are explicitly expressed in terms of Doppler centroid frequency and Doppler frequency rate, which can be accurately estimated from the SAR data. Point target simulation results show that the algorithm based on the two-dimensional Fourier transformation outperforms the one-dimensional one for processing data acquired from high squint angles. The two-dimensional Fourier transformation approach appears to be a viable and simple solution for the processor design of future spaceborne SAR systems.

  9. 99m-Tc DMSA scintigraphy and color/power doppler sonography for children pyelonephritis diagnosis and follow-up; Scintigraphie au 99m-Tc DMSA et echo-doppler couleur/energie dans le diagnostic et le suivi des pyelonephrites de l'enfant

    Energy Technology Data Exchange (ETDEWEB)

    Hitzel, A.; Manrique, A.; Gardin, I.; Vera, P. [Centre de Lutte Contre le Cancer Henri-Becquerel, Dept. de Medecine Nucleaire, 76 - Rouen (France); Centre Hospitalier Universitaire Charles Nicolle, 76 - Rouen (France); Dacher, J.N.; Menard, J.F.; Vera, P. [Laboratoire Universitaire Quant.I.F., Faculte de Medecine de Rouen, 76 (France); Dacher, J.N. [Centre Hospitalier Universitaire Charles Nicolle, Dept. de Radiologie, 76 - Rouen (France); Liard, A. [Centre Hospitalier Universitaire Charles Nicolle, Dept. de Chirurgie Pediatrique, 76 - Rouen (France); Menard, J.F. [Centre Hospitalier Universitaire Charles Nicolle, Dept. de BioStatistiques, 76 - Rouen (France)

    2004-04-01

    Early diagnosis of acute pyelonephritis is essential to avoid scarring development. This study was performed to evaluate capabilities of color/doppler sonography to detect pyelonephritis and to predict scarring when compared with {sup 99m}Tc-DMSA scintigraphy. Fifty-seven children were evaluated during pyelonephritis: biology (CRP, creatinine, blood formula), color/power doppler sonography and {sup 99m}Tc-DMSA scintigraphy (DMSA1). 7 {+-} 2 months later, follow-up consisted in biological tests and a {sup 99m}'Tc-DMSA scintigraphy (DMSA2). During pyelonephritis, body temperature, CRP value and neutrophil counts were significantly higher in patients with an abnormal DMSA1 but not in patients with abnormal doppler sonography. When compared with DMSA1, doppler sonography sensitivity and specificity were 80% and 81% respectively. DMSA1 and doppler sonography were concordant in 86% of children with a pyelonephritis. At follow-up, all clinical et biological parameters were normalized. DMSA2 was abnormal in 51% of children. When compared with DMSA2, positive and negative predictive values for scarring of doppler sonography were 57% and 75% respectively. DMSA 1, positive and negative predictive values for scarring were 62% and 100%. In conclusion, color/power doppler sonography is a reliable tool for pyelonephritis diagnosis, but its predictive value for scarring is poor. Negative predictive value of DMSA scintigraphy is excellent. (author)

  10. Evaluation of cardiac longitudinal systolic function in patients with heart transplant using two dimensional speckle tracking echocardiography and tissue Doppler imaging%二维斑点追踪及组织多普勒技术评价移植心脏纵向收缩功能的临床研究

    Institute of Scientific and Technical Information of China (English)

    李政; 潘翠珍; 舒先红; 陈昊; 王春生

    2014-01-01

    目的 应用二维斑点追踪技术及组织多普勒技术分别评价移植心脏左、右室纵向收缩功能.方法 56例心脏移植患者,根据心内膜心肌活检及长期临床随访结果分为无排异组(A组)和排异组(B组),随机入选36例健康志愿者归入C组,测量左室射血分数(LVEF)、肺动脉收缩压、三尖瓣瓣环位移(TAPSE)和三尖瓣瓣环收缩期速度(TA-S')等指标.应用Qlab 9.0软件分析获得左室整体纵向应变值(global longitudinal strain,GLS).结果 B组较C组LVEF降低(P<0.01).三组间GLS、TAPSE及TA-S'值比较差异均有统计学意义(P均<0.01),B组<A组<C组;GLS与LVEF、TAPSE、TA-S'有较好的负相关性(r分别为-0.64,-0.69,-0.71,P均<0.01).结论 心脏移植患者左、右室纵向收缩功能均有不同程度降低.%Objective To investigate longitudinal systolic function of transplanted heart using two dimensional speckle tracking echocardiography and tissue Doppler imaging.Methods 56 consecutive patients with heart transplant were recruited,according to myocardial biopsy and 1 year's follow up,they were divided into non-rejection group (group A) and rejection group (group B).36 healthy controls (group C) were also randomly recruited.Left ventricular ejection fraction (LVEF),pulmonary arterial systolic pressure,tricuspid annular plane systolic excursion (TAPSE),tricuspid annular plane systolic velocity (TAS') and global longitudinal strain (GLS) were calculated via Qlab 9.0 analysis software offline.Results Compared with group C,LVEF was reduced in group B (P <0.01).Differences of GLS,TAPSE,and TA-S' among groups were all statistically significant (P <0.01),group B<group A< group C.LVEF,TAPSE and TA-S' were correlated with GLS (r =-0.64,r =-0.69,r =-0.71 ; all P < 0.01).Conclusions Left and right ventricles were a functional unity,the systolic function of which was impaired in patients with heart transplant.

  11. Serial color Doppler flow of uterine vasculature combined with serum beta-hCG measurements for improved monitoring of patients with gestational trophoblastic disease. A preliminary report.

    Science.gov (United States)

    Maymon, R; Schneider, D; Shulman, A; Bukowsky, I; Weinraub, Z

    1996-01-01

    Weekly serum beta-hCG measurements and transvaginal ultrasound scans coupled with color Doppler flow were performed on 8 patients with hydatidiform mole. Two patients later developed persistent trophoblastic disease, necessitating chemotherapy. The correlation coefficients between Doppler flow indices, systolic-diastolic (S/D) ratio and pulsatility index (PI) with log beta-hCG were -0.96 and -0.97, respectively. The weekly S/D and PI indices were plotted on an individual curve. Only the 2 patients who developed persistent gestational trophoblastic disease had PI index levels of < or = 1.5 as early as 2 weeks after molar evacuation. At that stage their serum beta-hCG levels were not different from some of the other patients. In this preliminary report, the regression of the disease could be reliably assessed by observing the changes in low resistance flow which paralleled the gradual decrements in serial beta-hCG levels. Thus, the contribution of this noninvasive imaging technique encourages the authors to further investigate Doppler flow monitoring among a larger sample of patients suffering from various gestational trophoblastic diseases.

  12. Interpolation by two-dimensional cubic convolution

    Science.gov (United States)

    Shi, Jiazheng; Reichenbach, Stephen E.

    2003-08-01

    This paper presents results of image interpolation with an improved method for two-dimensional cubic convolution. Convolution with a piecewise cubic is one of the most popular methods for image reconstruction, but the traditional approach uses a separable two-dimensional convolution kernel that is based on a one-dimensional derivation. The traditional, separable method is sub-optimal for the usual case of non-separable images. The improved method in this paper implements the most general non-separable, two-dimensional, piecewise-cubic interpolator with constraints for symmetry, continuity, and smoothness. The improved method of two-dimensional cubic convolution has three parameters that can be tuned to yield maximal fidelity for specific scene ensembles characterized by autocorrelation or power-spectrum. This paper illustrates examples for several scene models (a circular disk of parametric size, a square pulse with parametric rotation, and a Markov random field with parametric spatial detail) and actual images -- presenting the optimal parameters and the resulting fidelity for each model. In these examples, improved two-dimensional cubic convolution is superior to several other popular small-kernel interpolation methods.

  13. TWO-DIMENSIONAL TOPOLOGY OF COSMOLOGICAL REIONIZATION

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Yougang; Xu, Yidong; Chen, Xuelei [Key Laboratory of Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012 China (China); Park, Changbom [School of Physics, Korea Institute for Advanced Study, 85 Hoegiro, Dongdaemun-gu, Seoul 130-722 (Korea, Republic of); Kim, Juhan, E-mail: wangyg@bao.ac.cn, E-mail: cbp@kias.re.kr [Center for Advanced Computation, Korea Institute for Advanced Study, 85 Hoegiro, Dongdaemun-gu, Seoul 130-722 (Korea, Republic of)

    2015-11-20

    We study the two-dimensional topology of the 21-cm differential brightness temperature for two hydrodynamic radiative transfer simulations and two semi-numerical models. In each model, we calculate the two-dimensional genus curve for the early, middle, and late epochs of reionization. It is found that the genus curve depends strongly on the ionized fraction of hydrogen in each model. The genus curves are significantly different for different reionization scenarios even when the ionized faction is the same. We find that the two-dimensional topology analysis method is a useful tool to constrain the reionization models. Our method can be applied to the future observations such as those of the Square Kilometre Array.

  14. Two dimensional topology of cosmological reionization

    CERN Document Server

    Wang, Yougang; Xu, Yidong; Chen, Xuelei; Kim, Juhan

    2015-01-01

    We study the two-dimensional topology of the 21-cm differential brightness temperature for two hydrodynamic radiative transfer simulations and two semi-numerical models. In each model, we calculate the two dimensional genus curve for the early, middle and late epochs of reionization. It is found that the genus curve depends strongly on the ionized fraction of hydrogen in each model. The genus curves are significantly different for different reionization scenarios even when the ionized faction is the same. We find that the two-dimensional topology analysis method is a useful tool to constrain the reionization models. Our method can be applied to the future observations such as those of the Square Kilometer Array.

  15. Relation between three-dimensional geometry of the inflow tract to the orifice and the area, shape, and velocity of regurgitant color Doppler jets: an in vitro study.

    Science.gov (United States)

    Nicolosi, G L; Budano, S; Grenci, G M; Mangano, S; Cervesato, E; Zanuttini, D

    1990-01-01

    The relation between three-dimensional geometry of the inflow tract to the orifice and the area, shape, and velocity of regurgitant jets was studied in a pulsatile in vitro color Doppler flow model. A 2.5 MHz transducer connected to a diagnostic ultrasound machine was placed in a water tank facing pulsatile jets (duration, 0.5 second) obtained by a calibrated injector. Flow rate from 6 to 52 ml/sec were tested through a 5 mm diameter circular orifice. Four different three-dimensional inflow tract geometries were compared: (A) sharp-edged, (B) Venturi (funnel), (C) converging conical, and (D) diverging conical. Mean velocities of jets were measured by continuous-wave Doppler echocardiography. Driving pressures were also measured by means of a fluid-filled catheter. Two observers independently digitized contours of maximal color jet areas by computer system from two separate sets of experiments. Results are given as the mean values of the four measurements for each parameter. Jet areas were correlated to flow rate, with no difference from A through D. The shape (eccentricity) of jets was different between A and B (p less than 0.05), between B and D (p less than 0.01), and between C and D (p less than 0.01). The shape of jets was correlated with flow rate, continuous-wave velocity, and pressure gradient in B, C, and D but not in A. Measured pressure gradients and estimated gradients by continuous-wave Doppler echocardiography were similarly correlated from A through D.(ABSTRACT TRUNCATED AT 250 WORDS)

  16. 彩色多普勒超声诊断胎盘植入的价值%The Value of Color Doppler Ultrasound in Diagnosis of Placenta Accrete

    Institute of Scientific and Technical Information of China (English)

    王玲红; 武超

    2014-01-01

    目的:评价彩色多普勒超声诊断胎盘植入的价值。方法:回顾性分析2012年1月-2013年10月在天津市中心妇产科医院超声诊断胎盘低置状态或低置胎盘或前置胎盘的住院患者93例,其中超声检查疑似胎盘植入者24例。经腹部超声及阴道超声着重扫查胎盘的位置及其厚度、胎盘内回声、胎盘附着处子宫肌层厚度及其与子宫肌层的关系、与子宫相邻的膀胱壁情况、胎盘附着处血流情况。结果:24例经彩色多普勒超声检查疑似胎盘植入,经手术病理确诊为胎盘植入20例,其中粘连性胎盘4例,植入性胎盘14例,穿透性胎盘2例。超声误诊5例,漏诊1例。彩色多普勒超声检查的敏感度为95.00%,特异度为93.15%,阳性预测值为79.17%,阴性预测值为98.55%。结论:彩色多普勒超声为产前检查胎盘植入的较好方法。%Objective:To evaluate the value of color Doppler ultrasound in the diagnosis of placenta accreta. Methods:Retrospective analysis of 93 cases diagnosed as placenta low state ,low-lying placenta or placenta previa through ultrasound examination in our hospital between January 2012 to October 2013. 24 cases were diagnosed as placenta implantation among them. Abdominal and transvaginal ultrasonography focus in observing the thickness ,position and internal echo of the placenta , the thickness of uterine muscle in placental site ,the relationship between the placenta and uterine muscle ,and the adjacent urinary bladder wall blood flow in placental site were also included. Results:24 patients were suspected of placenta implantation by color Doppler ultrasonography,20 cases were confirmed of placenta implantation by pathology after operation,including 4 cases of placenta adherence,14 cases of placenta accreta,2 cases of placenta penetration.,5 cases of misdiagnosis, missed diagnosis in 1 cases. Sensitivity and specificity of color Doppler ultrasonography was 95.00% and 93

  17. a First Cryptosystem for Security of Two-Dimensional Data

    Science.gov (United States)

    Mishra, D. C.; Sharma, Himani; Sharma, R. K.; Kumar, Naveen

    In this paper, we present a novel technique for security of two-dimensional data with the help of cryptography and steganography. The presented approach provides multilayered security of two-dimensional data. First layer security was developed by cryptography and second layer by steganography. The advantage of steganography is that the intended secret message does not attract attention to itself as an object of scrutiny. This paper proposes a novel approach for encryption and decryption of information in the form of Word Data (.doc file), PDF document (.pdf file), Text document, Gray-scale images, and RGB images, etc. by using Vigenere Cipher (VC) associated with Discrete Fourier Transform (DFT) and then hiding the data behind the RGB image (i.e. steganography). Earlier developed techniques provide security of either PDF data, doc data, text data or image data, but not for all types of two-dimensional data and existing techniques used either cryptography or steganography for security. But proposed approach is suitable for all types of data and designed for security of information by cryptography and steganography. The experimental results for Word Data, PDF document, Text document, Gray-scale images and RGB images support the robustness and appropriateness for secure transmission of these data. The security analysis shows that the presented technique is immune from cryptanalytic. This technique further provides security while decryption as a check on behind which RGB color the information is hidden.

  18. 胡桃夹现象的彩色多普勒超声诊断及分析%The Diagnoses and Analysis of Nutcracker Phenomenon by Color Doppler Ultrasonography

    Institute of Scientific and Technical Information of China (English)

    邹勤; 邹雅; 权赫磊; 夏婷婷; 薛彩云; 侯淑娟; 刘露; 宋冬玲

    2015-01-01

    本文通过探讨彩色多普勒超声诊断胡桃夹现象(ncP)的临床价值,得出结论:彩色多普勒超声可作为诊断 ncP 的首选方法,ΔP 与 a/b 内径比联合应用可明显提高 ncP 的诊断准确性。%this paper through to investigate the clinic value of color doppler ultrasound in diagnosis of nutcracker Phenomenon(ncP),come to conclusion:color doppler ultrasound can provide important basis for clinical diagnosis of ncP. compositive adhibition of a/b and ΔP is the best method in diagnosis of ncP with color doppler ultrasound.

  19. Two-dimensional x-ray diffraction

    CERN Document Server

    He, Bob B

    2009-01-01

    Written by one of the pioneers of 2D X-Ray Diffraction, this useful guide covers the fundamentals, experimental methods and applications of two-dimensional x-ray diffraction, including geometry convention, x-ray source and optics, two-dimensional detectors, diffraction data interpretation, and configurations for various applications, such as phase identification, texture, stress, microstructure analysis, crystallinity, thin film analysis and combinatorial screening. Experimental examples in materials research, pharmaceuticals, and forensics are also given. This presents a key resource to resea

  20. Matching Two-dimensional Gel Electrophoresis' Spots

    DEFF Research Database (Denmark)

    Dos Anjos, António; AL-Tam, Faroq; Shahbazkia, Hamid Reza

    2012-01-01

    This paper describes an approach for matching Two-Dimensional Electrophoresis (2-DE) gels' spots, involving the use of image registration. The number of false positive matches produced by the proposed approach is small, when compared to academic and commercial state-of-the-art approaches. This ar......This paper describes an approach for matching Two-Dimensional Electrophoresis (2-DE) gels' spots, involving the use of image registration. The number of false positive matches produced by the proposed approach is small, when compared to academic and commercial state-of-the-art approaches...

  1. Mobility anisotropy of two-dimensional semiconductors

    Science.gov (United States)

    Lang, Haifeng; Zhang, Shuqing; Liu, Zhirong

    2016-12-01

    The carrier mobility of anisotropic two-dimensional semiconductors under longitudinal acoustic phonon scattering was theoretically studied using deformation potential theory. Based on the Boltzmann equation with the relaxation time approximation, an analytic formula of intrinsic anisotropic mobility was derived, showing that the influence of effective mass on mobility anisotropy is larger than those of deformation potential constant or elastic modulus. Parameters were collected for various anisotropic two-dimensional materials (black phosphorus, Hittorf's phosphorus, BC2N , MXene, TiS3, and GeCH3) to calculate their mobility anisotropy. It was revealed that the anisotropic ratio is overestimated by the previously described method.

  2. Towards two-dimensional search engines

    OpenAIRE

    Ermann, Leonardo; Chepelianskii, Alexei D.; Shepelyansky, Dima L.

    2011-01-01

    We study the statistical properties of various directed networks using ranking of their nodes based on the dominant vectors of the Google matrix known as PageRank and CheiRank. On average PageRank orders nodes proportionally to a number of ingoing links, while CheiRank orders nodes proportionally to a number of outgoing links. In this way the ranking of nodes becomes two-dimensional that paves the way for development of two-dimensional search engines of new type. Statistical properties of inf...

  3. Two-dimensional fruit ripeness estimation using thermal imaging

    Science.gov (United States)

    Sumriddetchkajorn, Sarun; Intaravanne, Yuttana

    2013-06-01

    Some green fruits do not change their color from green to yellow when being ripe. As a result, ripeness estimation via color and fluorescent analytical approaches cannot be applied. In this article, we propose and show for the first time how a thermal imaging camera can be used to two-dimensionally classify fruits into different ripeness levels. Our key idea relies on the fact that the mature fruits have higher heat capacity than the immature ones and therefore the change in surface temperature overtime is slower. Our experimental proof of concept using a thermal imaging camera shows a promising result in non-destructively identifying three different ripeness levels of mangoes Mangifera indica L.

  4. Piezoelectricity in Two-Dimensional Materials

    KAUST Repository

    Wu, Tao

    2015-02-25

    Powering up 2D materials: Recent experimental studies confirmed the existence of piezoelectricity - the conversion of mechanical stress into electricity - in two-dimensional single-layer MoS2 nanosheets. The results represent a milestone towards embedding low-dimensional materials into future disruptive technologies. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA.

  5. Kronecker Product of Two-dimensional Arrays

    Institute of Scientific and Technical Information of China (English)

    Lei Hu

    2006-01-01

    Kronecker sequences constructed from short sequences are good sequences for spread spectrum communication systems. In this paper we study a similar problem for two-dimensional arrays, and we determine the linear complexity of the Kronecker product of two arrays. Our result shows that similar good property on linear complexity holds for Kronecker product of arrays.

  6. Two-Dimensional Toda-Heisenberg Lattice

    Directory of Open Access Journals (Sweden)

    Vadim E. Vekslerchik

    2013-06-01

    Full Text Available We consider a nonlinear model that is a combination of the anisotropic two-dimensional classical Heisenberg and Toda-like lattices. In the framework of the Hirota direct approach, we present the field equations of this model as a bilinear system, which is closely related to the Ablowitz-Ladik hierarchy, and derive its N-soliton solutions.

  7. A novel two dimensional particle velocity sensor

    NARCIS (Netherlands)

    Pjetri, Olti; Wiegerink, Remco J.; Lammerink, Theo S.; Krijnen, Gijs J.

    2013-01-01

    In this paper we present a two wire, two-dimensional particle velocity sensor. The miniature sensor of size 1.0x2.5x0.525 mm, consisting of only two crossed wires, shows excellent directional sensitivity in both directions, thus requiring no directivity calibration, and is relatively easy to fabrica

  8. Two-dimensional microstrip detector for neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Oed, A. [Institut Max von Laue - Paul Langevin (ILL), 38 - Grenoble (France)

    1997-04-01

    Because of their robust design, gas microstrip detectors, which were developed at ILL, can be assembled relatively quickly, provided the prefabricated components are available. At the beginning of 1996, orders were received for the construction of three two-dimensional neutron detectors. These detectors have been completed. The detectors are outlined below. (author). 2 refs.

  9. Two-dimensional magma-repository interactions

    NARCIS (Netherlands)

    Bokhove, O.

    2001-01-01

    Two-dimensional simulations of magma-repository interactions reveal that the three phases --a shock tube, shock reflection and amplification, and shock attenuation and decay phase-- in a one-dimensional flow tube model have a precursor. This newly identified phase ``zero'' consists of the impact of

  10. Two-dimensional subwavelength plasmonic lattice solitons

    CERN Document Server

    Ye, F; Hu, B; Panoiu, N C

    2010-01-01

    We present a theoretical study of plasmonic lattice solitons (PLSs) formed in two-dimensional (2D) arrays of metallic nanowires embedded into a nonlinear medium with Kerr nonlinearity. We analyze two classes of 2D PLSs families, namely, fundamental and vortical PLSs in both focusing and defocusing media. Their existence, stability, and subwavelength spatial confinement are studied in detai

  11. A two-dimensional Dirac fermion microscope

    DEFF Research Database (Denmark)

    Bøggild, Peter; Caridad, Jose; Stampfer, Christoph

    2017-01-01

    in the solid state. Here we provide a perspective view on how a two-dimensional (2D) Dirac fermion-based microscope can be realistically implemented and operated, using graphene as a vacuum chamber for ballistic electrons. We use semiclassical simulations to propose concrete architectures and design rules of 2...

  12. Value of color Doppler ultrasonography in diagnosis of rhabdomyolysis%横纹肌溶解症的超声诊断价值探讨

    Institute of Scientific and Technical Information of China (English)

    亓恒涛; 滕剑波; 张先东; 王增涛; 袁海

    2012-01-01

    Objective To study the value of color Doppler sonography in diagnosis of rhabdomyolysis.Methods The color Doppler sonography images of twenty-one patients with diagnosed rhabdomyolysis were retrospective analyzed.The pathological changes of the muscle were observed.Results The appearance of ultrasound was cloundness and rough-cast glass change in the diseased area of rhabdomyolysis.The diseased region can be found by ultrasound,and location and scope can be displayed clearly.There were major differences in the location of rhabdomyolysis because of etiological factor.The muscle volume and tension of rhabdomyolysis were increased for trauma,the individual patients will lead to the osteofascial compartment syndrome.There was no blood flow signal or little blood flow signal in the diseased area of rhabdomyolysis.Conclusions The color Doppler sonography is an efficient method for diagnosis of rhabdomyolysis.%目的 探讨彩色多普勒超声对横纹肌溶解症的诊断价值.方法 回顾性分析经临床和化验室检查证实的21例横纹肌溶解症患者的彩色多普勒超声特征.结果 超声均可测及异常病变区域,并清晰显示病变的部位及范围;不同病因横纹肌溶解症发生部位因致病因素不同差别较大;病变区域横纹肌呈“云雾状”或“毛玻璃样”改变;部分创伤性原因所致横纹肌溶解患者部分肌束体积增大,张力明显提高,形成骨筋膜室综合征.彩色多普勒示病灶区内可见少量点状血流信号或无血流信号.结论 彩色多普勒超声检查是诊断横溶解溶解症的有效方法.

  13. 彩色多普勒超声对腰疝的诊断价值%The diagnostic value of color Doppler ultrasound for lumbar hernia

    Institute of Scientific and Technical Information of China (English)

    林炳钦

    2013-01-01

    Objective To investigate the clinical value of color Doppler high-frequency ultrasound in the diagnosis of lumbar hernia.Methods The clinical data on six patients with surgically confirmed lumbar hernia who had been hosptialized during the period of January 1997 to August 2012 were retrospectively analyzed.Results Left lumbar hernia occurred in four paients and right lumbar hernia occurred in two patients; one of the six patients was complicated by acute intestinal obstruction.The color Doppler ultrasound showed part of the intraabdominal contents (visible peristaltic intestinal echo) protruded into the subcutaneous soft tissue of the iliolumbar region through the lumbar triangle gap,with interruption of the continuity of deep muscle tissue and fascia echoes.Conclusions Color Doppler ultrasound can show the hernia sac and hernial contents,which has important clinical value in the diagnosis of lumbar hernia can be used as the first choice of examination for lumbar hernia.%目的 探讨彩色多普勒高频超声对腰疝诊断的临床价值.方法 将1997年1月至2012年8月在我院经手术证实的6例腰疝患者临床资料进行回顾性分析.结果 左侧腰疝4例,右侧腰疝2例,其中1例合并急性肠梗阻,6例腰疝彩色多普勒超声表现为部分腹腔内容物(可见蠕动肠管回声)经腰三角间隙疝出于髂腰部皮下软组织内,深部肌层组织及筋膜回声连续性中断.结论 彩色多普勒超声可显示疝囊和疝内容物,对腰疝的诊断具有重要的临床价值,可作为腰疝的首选检查方法.

  14. Application of color Doppler ultrasound in the acute scrotum%彩色多普勒超声在诊断阴囊急症中的应用

    Institute of Scientific and Technical Information of China (English)

    怀玉水; 尹正银; 孙医学

    2012-01-01

    目的:探讨彩色多普勒超声(彩超)在诊断阴囊急症中的应用价值.方法:对72例彩超检查阴囊急症患者的结果进行回顾分析,与随访结果作对照.结果:确诊睾丸扭转23例,彩超正确诊断22例,声像图主要表现为睾丸位置上提、横位或斜位,形态失常,回声减低不均匀,血流信号消失.确诊睾丸附睾炎45例,彩超正确诊断44例,声像图主要表现为睾丸附睾的增大,局部回声减低,不均匀.睾丸外伤4例,彩超均正确诊断,声像图主要表现睾丸形态不完整,局部包膜回声中断,损伤区回声不均匀.结论:彩超能较可靠地诊断与鉴别阴囊急症,为临床诊断与治疗提供了重要信息.%Objective: To explore the application of color Doppler ultrasound in the acute scrotum. Methods: The results of color Doppler ultrasound examination of 72 patients with acute scrotum were retrospectively analyzed,and compared with following-up results. Results : Of 23 cases with testicular torsion,22 cases were diagnosed by ultrasonography, which ultrasonography displayed mainly raising testicular location, transverse or oblique, abnormal morphology, uneven hypoechoic and blood flow signal loss. Of 45 cases with epididymitis,44 cases were diagnosed by ultrasonography,which ultrasonography displayed mainly the increasing testis and epididymis, reducting and uneven local echo. Four cases with testicular trauma were correctly diagnosed by ultrasonography, which ultrasonography displayed mainly no complete testicular morphology, partial envelope echo interrupt and uneven echo in injury area. Conclusions: Color Doppler ultrasound can reliably diagnose and differentially diagose the acute scrotum, which can provide the important application value for clinical diagnosis and treatment.

  15. Factors influencing the structure and shape of stenotic and regurgitant jets: an in vitro investigation using Doppler color flow mapping and optical flow visualization.

    Science.gov (United States)

    Krabill, K A; Sung, H W; Tamura, T; Chung, K J; Yoganathan, A P; Sahn, D J

    1989-06-01

    To evaluate factors influencing the structure and shape of stenotic and regurgitant jets, Doppler color flow mapping and optical flow visualization studies were performed with use of a syringe model with a constant rate of ejection to simulate jets of valvular regurgitation and a pulsatile flow model of the right heart chambers to simulate jets of mild, moderate and severe valvular pulmonary stenosis. Ink-(0 to 40%) glycerol-water jets (viscosity 1 to 3.5 centiPoise) were produced by injecting the fluid at a constant rate into a 10 gallon rectangular reservoir of the same still fluid through 1.4 and 3.4 mm needles. The Doppler color flow scanners imaged the laminar jet length within 3 mm of actual jet length (2 to 6 cm) and the jet width within 2 to 3 mm of the actual jet width. Jet flows with Reynolds numbers ranging from 230 to 1,200 injected into still fluid yielded jet length/width ratios that decreased with increasing Reynolds numbers and leveled off to a length/width ratio of 5-6:1 at a Reynolds number near 600. When the fluid reservoir was swirled to better mimic the effect of flow entering the same cardiac chamber from a second source, the jets showed diminution of the jet length/width ratio and a clearly defined zone of turbulence. Studies of the pulsatile flow model were performed at cardiac outputs of 1 to 6 liters/min for the normal and each stenotic valve. Mild stenosis had an orifice area of 2.8 cm2, moderate stenosis an area of 1.0 cm2 and severe stenosis an area of 0.5 cm2. Laminar jet length represented the length of the total jet, which had a symmetric width and was measured from the valve opening to a region where the jet exhibited a spray effect. Laminar jet lengths (0.2 to 1.1 cm) were imaged by Doppler color flow mapping and optical visualization only in the moderate and severely stenotic valves and only at flows less than or equal to 3 liters/min (mean Reynolds numbers less than or equal to 3,470). Beyond this flow rate the jets exhibited a

  16. Electronics based on two-dimensional materials.

    Science.gov (United States)

    Fiori, Gianluca; Bonaccorso, Francesco; Iannaccone, Giuseppe; Palacios, Tomás; Neumaier, Daniel; Seabaugh, Alan; Banerjee, Sanjay K; Colombo, Luigi

    2014-10-01

    The compelling demand for higher performance and lower power consumption in electronic systems is the main driving force of the electronics industry's quest for devices and/or architectures based on new materials. Here, we provide a review of electronic devices based on two-dimensional materials, outlining their potential as a technological option beyond scaled complementary metal-oxide-semiconductor switches. We focus on the performance limits and advantages of these materials and associated technologies, when exploited for both digital and analog applications, focusing on the main figures of merit needed to meet industry requirements. We also discuss the use of two-dimensional materials as an enabling factor for flexible electronics and provide our perspectives on future developments.

  17. Two-dimensional ranking of Wikipedia articles

    Science.gov (United States)

    Zhirov, A. O.; Zhirov, O. V.; Shepelyansky, D. L.

    2010-10-01

    The Library of Babel, described by Jorge Luis Borges, stores an enormous amount of information. The Library exists ab aeterno. Wikipedia, a free online encyclopaedia, becomes a modern analogue of such a Library. Information retrieval and ranking of Wikipedia articles become the challenge of modern society. While PageRank highlights very well known nodes with many ingoing links, CheiRank highlights very communicative nodes with many outgoing links. In this way the ranking becomes two-dimensional. Using CheiRank and PageRank we analyze the properties of two-dimensional ranking of all Wikipedia English articles and show that it gives their reliable classification with rich and nontrivial features. Detailed studies are done for countries, universities, personalities, physicists, chess players, Dow-Jones companies and other categories.

  18. Two-Dimensional NMR Lineshape Analysis

    Science.gov (United States)

    Waudby, Christopher A.; Ramos, Andres; Cabrita, Lisa D.; Christodoulou, John

    2016-04-01

    NMR titration experiments are a rich source of structural, mechanistic, thermodynamic and kinetic information on biomolecular interactions, which can be extracted through the quantitative analysis of resonance lineshapes. However, applications of such analyses are frequently limited by peak overlap inherent to complex biomolecular systems. Moreover, systematic errors may arise due to the analysis of two-dimensional data using theoretical frameworks developed for one-dimensional experiments. Here we introduce a more accurate and convenient method for the analysis of such data, based on the direct quantum mechanical simulation and fitting of entire two-dimensional experiments, which we implement in a new software tool, TITAN (TITration ANalysis). We expect the approach, which we demonstrate for a variety of protein-protein and protein-ligand interactions, to be particularly useful in providing information on multi-step or multi-component interactions.

  19. Towards two-dimensional search engines

    CERN Document Server

    Ermann, Leonardo; Shepelyansky, Dima L

    2011-01-01

    We study the statistical properties of various directed networks using ranking of their nodes based on the dominant vectors of the Google matrix known as PageRank and CheiRank. On average PageRank orders nodes proportionally to a number of ingoing links, while CheiRank orders nodes proportionally to a number of outgoing links. In this way the ranking of nodes becomes two-dimensional that paves the way for development of two-dimensional search engines of new type. Information flow properties on PageRank-CheiRank plane are analyzed for networks of British, French and Italian Universities, Wikipedia, Linux Kernel, gene regulation and other networks. Methods of spam links control are also analyzed.

  20. Toward two-dimensional search engines

    Science.gov (United States)

    Ermann, L.; Chepelianskii, A. D.; Shepelyansky, D. L.

    2012-07-01

    We study the statistical properties of various directed networks using ranking of their nodes based on the dominant vectors of the Google matrix known as PageRank and CheiRank. On average PageRank orders nodes proportionally to a number of ingoing links, while CheiRank orders nodes proportionally to a number of outgoing links. In this way, the ranking of nodes becomes two dimensional which paves the way for the development of two-dimensional search engines of a new type. Statistical properties of information flow on the PageRank-CheiRank plane are analyzed for networks of British, French and Italian universities, Wikipedia, Linux Kernel, gene regulation and other networks. A special emphasis is done for British universities networks using the large database publicly available in the UK. Methods of spam links control are also analyzed.

  1. A two-dimensional Dirac fermion microscope

    Science.gov (United States)

    Bøggild, Peter; Caridad, José M.; Stampfer, Christoph; Calogero, Gaetano; Papior, Nick Rübner; Brandbyge, Mads

    2017-06-01

    The electron microscope has been a powerful, highly versatile workhorse in the fields of material and surface science, micro and nanotechnology, biology and geology, for nearly 80 years. The advent of two-dimensional materials opens new possibilities for realizing an analogy to electron microscopy in the solid state. Here we provide a perspective view on how a two-dimensional (2D) Dirac fermion-based microscope can be realistically implemented and operated, using graphene as a vacuum chamber for ballistic electrons. We use semiclassical simulations to propose concrete architectures and design rules of 2D electron guns, deflectors, tunable lenses and various detectors. The simulations show how simple objects can be imaged with well-controlled and collimated in-plane beams consisting of relativistic charge carriers. Finally, we discuss the potential of such microscopes for investigating edges, terminations and defects, as well as interfaces, including external nanoscale structures such as adsorbed molecules, nanoparticles or quantum dots.

  2. A two-dimensional Dirac fermion microscope.

    Science.gov (United States)

    Bøggild, Peter; Caridad, José M; Stampfer, Christoph; Calogero, Gaetano; Papior, Nick Rübner; Brandbyge, Mads

    2017-06-09

    The electron microscope has been a powerful, highly versatile workhorse in the fields of material and surface science, micro and nanotechnology, biology and geology, for nearly 80 years. The advent of two-dimensional materials opens new possibilities for realizing an analogy to electron microscopy in the solid state. Here we provide a perspective view on how a two-dimensional (2D) Dirac fermion-based microscope can be realistically implemented and operated, using graphene as a vacuum chamber for ballistic electrons. We use semiclassical simulations to propose concrete architectures and design rules of 2D electron guns, deflectors, tunable lenses and various detectors. The simulations show how simple objects can be imaged with well-controlled and collimated in-plane beams consisting of relativistic charge carriers. Finally, we discuss the potential of such microscopes for investigating edges, terminations and defects, as well as interfaces, including external nanoscale structures such as adsorbed molecules, nanoparticles or quantum dots.

  3. Two-Dimensional Scheduling: A Review

    Directory of Open Access Journals (Sweden)

    Zhuolei Xiao

    2013-07-01

    Full Text Available In this study, we present a literature review, classification schemes and analysis of methodology for scheduling problems on Batch Processing machine (BP with both processing time and job size constraints which is also regarded as Two-Dimensional (TD scheduling. Special attention is given to scheduling problems with non-identical job sizes and processing times, with details of the basic algorithms and other significant results.

  4. Two dimensional fermions in four dimensional YM

    CERN Document Server

    Narayanan, R

    2009-01-01

    Dirac fermions in the fundamental representation of SU(N) live on a two dimensional torus flatly embedded in $R^4$. They interact with a four dimensional SU(N) Yang Mills vector potential preserving a global chiral symmetry at finite $N$. As the size of the torus in units of $\\frac{1}{\\Lambda_{SU(N)}}$ is varied from small to large, the chiral symmetry gets spontaneously broken in the infinite $N$ limit.

  5. Two-dimensional Kagome photonic bandgap waveguide

    DEFF Research Database (Denmark)

    Nielsen, Jens Bo; Søndergaard, Thomas; Libori, Stig E. Barkou;

    2000-01-01

    The transverse-magnetic photonic-bandgap-guidance properties are investigated for a planar two-dimensional (2-D) Kagome waveguide configuration using a full-vectorial plane-wave-expansion method. Single-moded well-localized low-index guided modes are found. The localization of the optical modes...... is investigated with respect to the width of the 2-D Kagome waveguide, and the number of modes existing for specific frequencies and waveguide widths is mapped out....

  6. String breaking in two-dimensional QCD

    CERN Document Server

    Hornbostel, K J

    1999-01-01

    I present results of a numerical calculation of the effects of light quark-antiquark pairs on the linear heavy-quark potential in light-cone quantized two-dimensional QCD. I extract the potential from the Q-Qbar component of the ground-state wavefunction, and observe string breaking at the heavy-light meson pair threshold. I briefly comment on the states responsible for the breaking.

  7. Two-dimensional supramolecular electron spin arrays.

    Science.gov (United States)

    Wäckerlin, Christian; Nowakowski, Jan; Liu, Shi-Xia; Jaggi, Michael; Siewert, Dorota; Girovsky, Jan; Shchyrba, Aneliia; Hählen, Tatjana; Kleibert, Armin; Oppeneer, Peter M; Nolting, Frithjof; Decurtins, Silvio; Jung, Thomas A; Ballav, Nirmalya

    2013-05-07

    A bottom-up approach is introduced to fabricate two-dimensional self-assembled layers of molecular spin-systems containing Mn and Fe ions arranged in a chessboard lattice. We demonstrate that the Mn and Fe spin states can be reversibly operated by their selective response to coordination/decoordination of volatile ligands like ammonia (NH3). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  8. Two dimensional echocardiographic detection of intraatrial masses.

    Science.gov (United States)

    DePace, N L; Soulen, R L; Kotler, M N; Mintz, G S

    1981-11-01

    With two dimensional echocardiography, a left atrial mass was detected in 19 patients. Of these, 10 patients with rheumatic mitral stenosis had a left atrial thrombus. The distinctive two dimensional echocardiographic features of left atrial thrombus included a mass of irregular nonmobile laminated echos within an enlarged atrial cavity, usually with a broad base of attachment to the posterior left atrial wall. Seven patients had a left atrial myxoma. Usually, the myxoma appeared as a mottled ovoid, sharply demarcated mobile mass attached to the interatrial septum. One patient had a right atrial angiosarcoma that appeared as a nonmobile mass extending from the inferior vena caval-right atrial junction into the right atrial cavity. One patient had a left atrial leiomyosarcoma producing a highly mobile mass attached to the lateral wall of the left atrium. M mode echocardiography detected six of the seven myxomas, one thrombus and neither of the other tumors. Thus, two dimensional echocardiography appears to be the technique of choice in the detection, localization and differentiation of intraatrial masses.

  9. Diagnosis of Noncompaction of Ventricular Myocardium with Color Doppler Ultrasound%彩色多普勒超声诊断心肌致密化不全

    Institute of Scientific and Technical Information of China (English)

    张凌; 黄昌举

    2011-01-01

    目的 探讨彩色多普勒超声心动图对心肌致密化不全(NVM)的诊断价值,以预防致死性心律失常和栓塞.资料与方法 彩色多普勒超声以左心室长轴、左心室短轴、心尖四腔等多切面扫查,重点观察近心尖1/3的心肌与心内膜.16例经心血管造影对照,11例行介入治疗,3例行手术治疗.结果 30例患者超声心动图检查心腔内异常粗大的肌小梁和其间深陷的隐窝.彩色多普勒显示隐窝内的低速血流与心腔内高速血流相通.25例为左心室型,2例为右心室型,3例为双心室型.2例因严重充血性心力衰竭而最终进行心脏移植.对受体心脏进行了病理解剖和组织学检查,受累心腔内显示有异常粗大的肌小梁和交错深陷的隐窝,从心底到心尖致密心肌逐渐变薄,心内膜为增厚的纤维组织,内层非致密心肌肌束粗大、细胞核异型,外层致密心肌肌束形态正常,细胞核大小均匀.结论 彩色多普勒超声心动图是诊断左心室心肌致密化不全的首选方法,具有特征性意义.%Purpose By discussing the diagnostic value of Color Doppler Ultrasound of noncompaction of ventricular myocardium (NVM) ,to prevent life-threatening arrhythmias and embolism.Materials and Methods Color Doppler Ultrasound adopts multiplanar scanning on long axis and short axis of left ventricle,apical four-chamber and so on,with an emphasis on observing myocardium and endocardium approach to one-third of apex of heart.16 cases were contrasted by angiocardiography, 11 cases underwent interventional therapy and 3 cases underwent operation for combined congenital heart disease.Results Echocardiographic findings were shown in 30 cases of patients with prominent and excessive myocardial trabeculations and deep intratrabecular recesses in left ventricular.The Color Doppler flow imaging showed that blood in the muscular trabeculations tissues may circulate to chambers of the heart.Twenty-five cases of patients were

  10. Different imaging methods in the comparative assessment of vascular lesions: color-coded duplex sonography, laser Doppler perfusion imaging, and infrared thermography

    Science.gov (United States)

    Urban, Peter; Philipp, Carsten M.; Weinberg, Lutz; Berlien, Hans-Peter

    1997-12-01

    Aim of the study was the comparative investigation of cutaneous and subcutaneous vascular lesions. By means of color coded duplex sonography (CCDS), laser doppler perfusion imaging (LDPI) and infrared thermography (IT) we examined hemangiomas, vascular malformations and portwine stains to get some evidence about depth, perfusion and vascularity. LDI is a helpful method to get an impression of the capillary part of vascular lesions and the course of superficial vessels. CCDS has disadvantages in the superficial perfusion's detection but connections to deeper vascularizations can be examined precisely, in some cases it is the only method for visualizing vascular malformations. IT gives additive hints on low blood flow areas or indicates arterial-venous-shunts. Only the combination of all imaging methods allows a complete assessment, not only for planning but also for controlling the laser treatment of vascular lesions.

  11. Spontaneous development of bilateral subdural hematomas in an infant with benign infantile hydrocephalus: color Doppler assessment of vessels traversing extra-axial spaces

    Energy Technology Data Exchange (ETDEWEB)

    Amodio, John; Spektor, Vadim; Pramanik, Bidyut; Rivera, Rafael; Pinkney, Lynne; Fefferman, Nancy [New York University Medical Center, Department of Radiology, New York, NY (United States)

    2005-11-01

    We present an infant with macrocrania, who initially demonstrated prominent extra-axial fluid collections on sonography of the brain, compatible with benign infantile hydrocephalus (BIH). Because of increasing macrocrania, a follow-up sonogram of the brain was performed; it revealed progressive enlargement of the extra-axial spaces, which now had echogenic debris. Color Doppler US showed bridging veins traversing these extra-axial spaces, so it was initially thought that these spaces were subarachnoid in nature (positive cortical vein sign). However, an arachnoid membrane was identified superior to the cortex, and there was compression of true cortical vessels beneath this dural membrane. An MRI of the brain showed the extra-axial spaces to represent bilateral subdural hematomas. The pathogenesis of spontaneous development of the subdural hematomas, in the setting of BIH, is discussed. We also emphasize that visualizing traversing bridging veins through extra-axial spaces does not necessarily imply that these spaces are subarachnoid in origin. (orig.)

  12. Diagnostic value of color doppler ultrasound in endometrial lesions%彩超在子宫内膜病变鉴别诊断中的价值

    Institute of Scientific and Technical Information of China (English)

    王敏; 朱建慧

    2012-01-01

    Objective To evaluate the differential diagnostic value of color doppler ultrasound in endometrial lesions.Methods Sixty-seven patients with endometrial lesions were examined by abdominal and transvaginal ultrasound preoperatively,observing endometrial condition,all of the operation or diagnostic curettage pathological results were compared and analyzed.Results The coincidence of ultrasound diagnosis was 91.6% for endometrial polyps,90.0% for endometrial hyperplasia,87.5% for submucous myoma of uterus,93.7% for endometrial carcinoma,0% for endometrial stromal sarcoma,100% for atrophic endometritis.Conclusions The diagnostic value of color doppler ultrasound in endometrial lesions can not be replaced.%目的 探讨彩色多普勒超声对子宫内膜病变的鉴别诊断价值.方法 术前应用腹部及阴道超声观察67例子宫内膜病变患者的病灶情况,并与术后病理进行对照分析.结果 超声诊断符合率:子宫内膜息肉为91.6%,子宫内膜增生为90.0%,子宫黏膜下肌瘤为87.5%,子宫内膜癌为93.7%,子宫内膜间质肉瘤为0%,萎缩性子宫内膜炎为100%.结论 彩色多普勒超声检查对子宫内膜病变的鉴别诊断有不可替代的作用.

  13. Color Doppler ultrasound detection of uterine artery S/D, PI and RI in patients with preeclampsia and their correlation with disease severity

    Institute of Scientific and Technical Information of China (English)

    Yan-Ping Zhao

    2016-01-01

    Objective:To study color Doppler ultrasound detection of uterine artery S/D, PI and RI in patients with preeclampsia and their correlation with disease severity.Methods:Pregnant women with preeclampsia were selected as PE group, healthy pregnant women were the NOR group, color Doppler ultrasound detection was conducted to detect uterine artery S/D, PI and RI, serum was collected to detect the contents of angiogenesis-related cytokines, and placenta tissue was collected to detect the contents of proteases as well as inhibitors, oxidative stress molecules and anti-apoptotic molecules.Results: S/D, PI and RI of PE group were significantly higher than those of NOR group; serum PIGF, VEGF and PAPP-A contents of PE group were significantly lower than those of NOR group and negatively correlated with S/D, PI and RI while sVEGFR-1 and Kisspeptin-10 contents were significantly higher than those of NOR group and positively correlated with S/D, PI and RI; CTSB, CTSL, MMP3, MMP9, SOD, GST, VitC, VitE and coenzyme Q10 as well as Xiap and Survivin contents in placenta tissue of PE group were lower than those of NOR group and negatively correlated with S/D, PI and RI while TIMP1, TIMP2, TIMP3 and RECK contents were higher than those of NOR group and positively correlated with S/D, PI and RI.Conclusion: Uterine artery S/D, PI and RI significantly increase in patients with preeclampsia, and can assess the angiogenesis, cell invasion, anti-apoptosis and oxidative stress in patients.

  14. 'Focal thyroid inferno' on color Doppler ultrasonography: A specific feature of focal Hashimoto's thyroiditis

    Energy Technology Data Exchange (ETDEWEB)

    Fu, Xianshui, E-mail: fuxs1968@163.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Guo, Limei, E-mail: guolimei@bjmu.edu.cn [Department of Pathology, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Zhang, Huabin, E-mail: huabinzhang@bjmu.edu.cn [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Ran, Weiqiang, E-mail: ranwq-sina@vip.sina.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Fu, Peng, E-mail: fupeng01@gmail.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Li, Zhiqiang, E-mail: lizhq126@126.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Chen, Wen, E-mail: wendy7989@sina.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Jiang, Ling, E-mail: papayaling@yahoo.com.cn [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Wang, Jinrui, E-mail: jinrui_wang@sina.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China); Jia, Jianwen, E-mail: drjia88@sohu.com [Department of Ultrasound, Peking University Third Hospital, 49 Huayuanbeilu Road, Beijing 100191 (China)

    2012-11-15

    Purpose: To evaluate color-Doppler features predictive of focal Hashimoto's thyroiditis. Materials and methods: A total of 521 patients with 561 thyroid nodules that underwent surgeries or gun biopsies were included in this study. These nodules were divided into three groups: focal Hashimoto's thyroiditis (104 nodules in 101 patients), benignity other than focal Hashimoto's thyroiditis (73 nodules in 70 patients), and malignancy (358 nodules in 350 patients). On color Doppler sonography, four vascularity types were determined as: hypovascularity, marked internal flow, marked peripheral flow and focal thyroid inferno. The {chi}{sup 2} test was performed to seek the potential vascularity type with the predictive ability of certain thyroid pathology. Furthermore, the gray-scale features of each nodule were also studied. Results: The vascularity type I (hypovascularity) was more often seen in focal Hashimoto's thyroiditis than other benignity and malignancy (46% vs. 20.5% and 19%). While the type II (marked internal flow) showed the opposite tendency (26.9% [focal Hashimoto's thyroiditis] vs. 45.2% [other benignity] and 52.8% [malignancy]). However, type III (marked peripheral flow) was unable to predict any thyroid pathology. Importantly, type IV (focal thyroid inferno) was exclusive to focal Hashimoto's thyroiditis. All 8 type IV nodules appeared to be solid, hypoechoic, and well-defined. Using 'focal thyroid inferno' as an indicator of FHT, the diagnostic sensitivity and specificity were 7.7% and 100% respectively. Conclusions: The vascularity type of 'focal thyroid inferno' is specific for focal Hashimoto thyroiditis. Recognition of this particular feature may avoid unnecessary interventional procedures for some solid hypoechoic thyroid nodules suspicious of malignancy.

  15. Impact of nodular size on the predictive values of gray-scale,color-Doppler ultrasound, and sonoelastography for assessment of thyroid nodules

    Institute of Scientific and Technical Information of China (English)

    Yu-rong HONG; Yu-lian WU; Zhi-yan LUO; Ning-bo WU; Xue-ming LIU

    2012-01-01

    Objective:To define the roles of gray-scale,color-Doppler ultrasound,and sonoelastography for the assessment of thyroid nodule to determine whether nodule size affects the differential diagnosis of benign and malignant.Methods:A total of 243 consecutive subjects (214 women,29 men) with 329 thyroid nodules were examined by gray-scale,color-Doppler ultrasound,and sonoelastography in this prospective study.All patients underwent surgery and the final diagnosis was obtained from histopathological examination.Results:Three hundred and twenty-nine nodules (208 benign,121 malignant) were divided into small (SNs,5-10 mm,n=137) and large (LNs,>10 mm,n=192) nodules.Microcalcifications were more frequent in malignant LNs than in malignant SNs,but showed no significant difference between benign LNs and SNs.Poorly-circumscribed margins were not significantly different between malignant SNs and LNs,but were less frequent in benign LNs than in benign SNs.Among all nodules,marked intranodular vascularity was more frequent in LNs than in SNs.By comparison,shape ratio of anteroposterior to transverse dimensions (A/T) ≥1 was less frequent in LNs than in SNs.Otherwise,among all nodules,marked hypoechogenicity and elasticity score of 4-6 showed no significant difference between LNs and SNs.Conclusions:The predictive values of microcalcifications,nodular margins,A/T ratio,and marked intranodular vascularity depend on nodule size,but the predictive values of echogenicity and elastography do not.

  16. 闭合性阴茎海绵体白膜破裂伤的高频彩色多普勒超声诊断%Closed corpus cavernosum penis albuginea rupture of high freQuency color Doppler ultrasound in the diagnosis of trauma

    Institute of Scientific and Technical Information of China (English)

    邓连桂; 王晓波

    2014-01-01

    Objective:To investigate the diagnostic value of high frequency color Doppler ultrasound rupture injury in closed corpus cavernosum penis albuginea. Methods:Retrospective analysis of two-dimensional and color Doppler flow imaging features,summarize 9 cases of clinically proven closed corpus cavernosum penis albuginea rupture. Results:Diag-nosis of high frequency color Doppler ultrasonography on 9 cases of closed rupture of albuginea penis accuracy rate is 100%. The diagnosis mainly with 2D sonogram:(1)tunica albuginea penis surface linear hyperechoic discontinuity;(2) rupture of albuginea export occurs in the corpus cavernosum penis right,found in the proximal 1/3 segment;(3)with sponge body damage,damage is not homogeneous low echo.(4)penile subcutaneous effusion(hematoma). Color Doppler flow imaging showed no arteriovenous fistula or pseudoaneurysm,dorsal penile move,vein and cavernous artery blood flow. Conclusions:High frequency color Doppler ultrasound in closed corpus cavernosum penis albuginea rupture of albuginea rupture interrupt clear diagnosis,location and cavernous injury and hematoma location accurate judgment,is the preferred method of examination of closed rupture of albuginea penis sponge,can provide reliable information for the clinical treat-ment of.%目的:探讨高频彩色多普勒超声在闭合性阴茎海绵体白膜破裂伤中的诊断价值。方法回顾分析、总结经临床证实的9例闭合性阴茎海绵体白膜破裂的二维及彩色多普勒血流显像特征。结果高频彩色多普勒超声对9例闭合性阴茎海绵体白膜破裂的诊断准确率达100%。其诊断主要以二维声像图特征为主:(1)阴茎海绵体表面白膜呈线状高回声连续性中断;(2)白膜破裂口一般发生于右侧海绵体,多见于阴茎近端1/3段;(3)合并海绵体损伤,损伤处见不均匀低回声。(4)阴茎皮下积液(血肿)。彩色多普勒血流显像未见动静脉瘘及假性动脉

  17. Low-frequency high-definition power Doppler in visualizing and defining fetal pulmonary venous connections.

    Science.gov (United States)

    Liu, Lin; He, Yihua; Li, Zhian; Gu, Xiaoyan; Zhang, Ye; Zhang, Lianzhong

    2014-07-01

    The use of low-frequency high-definition power Doppler in assessing and defining pulmonary venous connections was investigated. Study A included 260 fetuses at gestational ages ranging from 18 to 36 weeks. Pulmonary veins were assessed by performing two-dimensional B-mode imaging, color Doppler flow imaging (CDFI), and low-frequency high-definition power Doppler. A score of 1 was assigned if one pulmonary vein was visualized, 2 if two pulmonary veins were visualized, 3 if three pulmonary veins were visualized, and 4 if four pulmonary veins were visualized. The detection rate between Exam-1 and Exam-2 (intra-observer variability) and between Exam-1 and Exam-3 (inter-observer variability) was compared. In study B, five cases with abnormal pulmonary venous connection were diagnosed and compared to their anatomical examination. In study A, there was a significant difference between CDFI and low-frequency high-definition power Doppler for the four pulmonary veins observed (P frequency high-definition power Doppler was higher than that when employing two-dimensional B-mode imaging or CDFI. There was no significant difference between the intra- and inter-observer variabilities using low-frequency high-definition power Doppler display of pulmonary veins (P > 0.05). The coefficient correlation between Exam-1 and Exam-2 was 0.844, and the coefficient correlation between Exam-1 and Exam-3 was 0.821. In study B, one case of total anomalous pulmonary venous return and four cases of partial anomalous pulmonary venous return were diagnosed by low-frequency high-definition power Doppler and confirmed by autopsy. The assessment of pulmonary venous connections by low-frequency high-definition power Doppler is advantageous. Pulmonary venous anatomy can and should be monitored during fetal heart examination.

  18. 经阴道彩超诊断瘢痕子宫妊娠的临床价值%Clinical value of transvaginal color doppler ultrasound in diagnosis of scar uterine pregnancy

    Institute of Scientific and Technical Information of China (English)

    顾兵

    2014-01-01

    目的:分析经阴道彩超诊断瘢痕子宫妊娠的临床价值。方法:收治瘢痕子宫妊娠患者52例,作为研究对象,所有患者均分别采取经腹部彩超和经阴道彩超检查,分析其诊断结果。结果:经腹部彩超诊断,诊断符合率73.1%;经阴道超声诊断,诊断符合率92.3%,组间对比差异有统计学意义(P<0.05)。经阴道彩超诊断,混合包块型27例,孕囊型15例,蜂窝型6例。结论:经阴道彩超可有效诊断瘢痕子宫妊娠,具有较高的确诊率,并且可直观显示病变处实际情况,为瘢痕子宫妊娠的治疗提供了必要的参考价值。%Objective:To discuss the clinical value of transvaginal color doppler ultrasound in diagnosis of scar uterine pregnancy. Methods:52 cases of patients with scar uterine pregnancy were admited and as the research objects.All cases were respectively adopted abdomen color doppler ultrasound and transvaginal color doppler ultrasound.Then analyze the diagnostic results.Results:The diagnostic accordance rate of abdomen color doppler ultrasound diagnosis was 73.1%,while the diagnostic accordance rate of transvaginal color doppler ultrasound was 92.3% .There was significant difference between the two methods(P<0.05).In the transvaginal color doppler ultrasound,27 cases were mixed bag piece type,15 cases were pregnant bursa type,and 6 cases were honeycomb type.Conclusion:Transvaginal color doppler ultrasound can effectively diagnose scar uterine pregnancy.It has a high diagnostic rate.It can display the actual situation of the lesion,and provide the necessary reference for the treatment of scar uterine pregnancy.

  19. Weakly disordered two-dimensional Frenkel excitons

    Science.gov (United States)

    Boukahil, A.; Zettili, Nouredine

    2004-03-01

    We report the results of studies of the optical properties of weakly disordered two- dimensional Frenkel excitons in the Coherent Potential Approximation (CPA). An approximate complex Green's function for a square lattice with nearest neighbor interactions is used in the self-consistent equation to determine the coherent potential. It is shown that the Density of States is very much affected by the logarithmic singularities in the Green's function. Our CPA results are in excellent agreement with previous investigations by Schreiber and Toyozawa using the Monte Carlo simulation.

  20. Two-dimensional photonic crystal surfactant detection.

    Science.gov (United States)

    Zhang, Jian-Tao; Smith, Natasha; Asher, Sanford A

    2012-08-07

    We developed a novel two-dimensional (2-D) crystalline colloidal array photonic crystal sensing material for the visual detection of amphiphilic molecules in water. A close-packed polystyrene 2-D array monolayer was embedded in a poly(N-isopropylacrylamide) (PNIPAAm)-based hydrogel film. These 2-D photonic crystals placed on a mirror show intense diffraction that enables them to be used for visual determination of analytes. Binding of surfactant molecules attaches ions to the sensor that swells the PNIPAAm-based hydrogel. The resulting increase in particle spacing red shifts the 2-D diffracted light. Incorporation of more hydrophobic monomers increases the sensitivity to surfactants.

  1. Theory of two-dimensional transformations

    OpenAIRE

    Kanayama, Yutaka J.; Krahn, Gary W.

    1998-01-01

    The article of record may be found at http://dx.doi.org/10.1109/70.720359 Robotics and Automation, IEEE Transactions on This paper proposes a new "heterogeneous" two-dimensional (2D) transformation group ___ to solve motion analysis/planning problems in robotics. In this theory, we use a 3×1 matrix to represent a transformation as opposed to a 3×3 matrix in the homogeneous formulation. First, this theory is as capable as the homogeneous theory, Because of the minimal size, its implement...

  2. Two-dimensional ranking of Wikipedia articles

    CERN Document Server

    Zhirov, A O; Shepelyansky, D L

    2010-01-01

    The Library of Babel, described by Jorge Luis Borges, stores an enormous amount of information. The Library exists {\\it ab aeterno}. Wikipedia, a free online encyclopaedia, becomes a modern analogue of such a Library. Information retrieval and ranking of Wikipedia articles become the challenge of modern society. We analyze the properties of two-dimensional ranking of all Wikipedia English articles and show that it gives their reliable classification with rich and nontrivial features. Detailed studies are done for countries, universities, personalities, physicists, chess players, Dow-Jones companies and other categories.

  3. Mobility anisotropy of two-dimensional semiconductors

    CERN Document Server

    Lang, Haifeng; Liu, Zhirong

    2016-01-01

    The carrier mobility of anisotropic two-dimensional (2D) semiconductors under longitudinal acoustic (LA) phonon scattering was theoretically studied with the deformation potential theory. Based on Boltzmann equation with relaxation time approximation, an analytic formula of intrinsic anisotropic mobility was deduced, which shows that the influence of effective mass to the mobility anisotropy is larger than that of deformation potential constant and elastic modulus. Parameters were collected for various anisotropic 2D materials (black phosphorus, Hittorf's phosphorus, BC$_2$N, MXene, TiS$_3$, GeCH$_3$) to calculate their mobility anisotropy. It was revealed that the anisotropic ratio was overestimated in the past.

  4. Sums of two-dimensional spectral triples

    DEFF Research Database (Denmark)

    Christensen, Erik; Ivan, Cristina

    2007-01-01

    construct a sum of two dimensional modules which reflects some aspects of the topological dimensions of the compact metric space, but this will only give the metric back approximately. At the end we make an explicit computation of the last module for the unit interval in. The metric is recovered exactly......, the Dixmier trace induces a multiple of the Lebesgue integral but the growth of the number of eigenvalues is different from the one found for the standard differential operator on the unit interval....

  5. Binding energy of two-dimensional biexcitons

    DEFF Research Database (Denmark)

    Singh, Jai; Birkedal, Dan; Vadim, Lyssenko;

    1996-01-01

    Using a model structure for a two-dimensional (2D) biexciton confined in a quantum well, it is shown that the form of the Hamiltonian of the 2D biexciton reduces into that of an exciton. The binding energies and Bohr radii of a 2D biexciton in its various internal energy states are derived...... analytically using the fractional dimension approach. The ratio of the binding energy of a 2D biexciton to that of a 2D exciton is found to be 0.228, which agrees very well with the recent experimental value. The results of our approach are compared with those of earlier theories....

  6. Dynamics of film. [two dimensional continua theory

    Science.gov (United States)

    Zak, M.

    1979-01-01

    The general theory of films as two-dimensional continua are elaborated upon. As physical realizations of such a model this paper examines: inextensible films, elastic films, and nets. The suggested dynamic equations have enabled us to find out the characteristic speeds of wave propagation of the invariants of external and internal geometry and formulate the criteria of instability of their shape. Also included herein is a detailed account of the equation describing the film motions beyond the limits of the shape stability accompanied by the formation of wrinkles. The theory is illustrated by examples.

  7. Two-Dimensional Impact Reconstruction Method for Rail Defect Inspection

    Directory of Open Access Journals (Sweden)

    Jie Zhao

    2014-01-01

    Full Text Available The safety of train operating is seriously menaced by the rail defects, so it is of great significance to inspect rail defects dynamically while the train is operating. This paper presents a two-dimensional impact reconstruction method to realize the on-line inspection of rail defects. The proposed method utilizes preprocessing technology to convert time domain vertical vibration signals acquired by wireless sensor network to space signals. The modern time-frequency analysis method is improved to reconstruct the obtained multisensor information. Then, the image fusion processing technology based on spectrum threshold processing and node color labeling is proposed to reduce the noise, and blank the periodic impact signal caused by rail joints and locomotive running gear. This method can convert the aperiodic impact signals caused by rail defects to partial periodic impact signals, and locate the rail defects. An application indicates that the two-dimensional impact reconstruction method could display the impact caused by rail defects obviously, and is an effective on-line rail defects inspection method.

  8. 双功能彩色多普勒评价阴茎勃起功能障碍%Evaluation of Impotence by Color Doppler Sonography

    Institute of Scientific and Technical Information of China (English)

    姚绍球; 王炼; 杨斌; 张征宇

    1993-01-01

    本文用双功能彩色多普勒超声俭查勃起功能障碍病人的阴茎血管共31例,对阴攀海锦体腔内注射罂粟碱前后的血流变化作了对比分析,结果16例为血管性阳莲,15例为非血管阳萎.血管性阳萎中,6例动脉供血不足,11例静脉机能不全(静脉漏).对阴茎血管性阳萎血流频谱改变进行了讨论与分析.%The penile vascularity of 31 patients was examined by duplex color sonography.Blood flow of penile vascularity was compared before and after papaverine imjeetion.15 cases were non-vasculogenic impotence.16 cases vaseulogenic impotence included arterial insufficiecy(5 cases)and venous leakage(11 cases).The vasculogenic impotence evaluated by duplex color Doppler was discussed and analysed.

  9. Two-dimensional electronic spectroscopy with birefringent wedges

    Energy Technology Data Exchange (ETDEWEB)

    Réhault, Julien; Maiuri, Margherita; Oriana, Aurelio; Cerullo, Giulio [IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano (Italy)

    2014-12-15

    We present a simple experimental setup for performing two-dimensional (2D) electronic spectroscopy in the partially collinear pump-probe geometry. The setup uses a sequence of birefringent wedges to create and delay a pair of phase-locked, collinear pump pulses, with extremely high phase stability and reproducibility. Continuous delay scanning is possible without any active stabilization or position tracking, and allows to record rapidly and easily 2D spectra. The setup works over a broad spectral range from the ultraviolet to the near-IR, it is compatible with few-optical-cycle pulses and can be easily reconfigured to two-colour operation. A simple method for scattering suppression is also introduced. As a proof of principle, we present degenerate and two-color 2D spectra of the light-harvesting complex 1 of purple bacteria.

  10. Efeito da brimonidina na circulação retrobulbar em pacientes com glaucoma: estudo com Doppler colorido Effect of brimonidine on the retrobulbar circulation in glaucomatous patients: a color Doppler study

    Directory of Open Access Journals (Sweden)

    Maria Rosa Bet de Moraes Silva

    2001-08-01

    Full Text Available Objetivo: Avaliar o efeito do tartarato de brimonidina a 0,2% tópico, instilado de 12/12 horas, na circulação retrobulbar em pacientes portadores de glaucoma. Métodos: Foram estudados os 2 olhos de 16 pacientes portadores de glaucoma primário de ângulo aberto e glaucoma crônico de ângulo estreito com iridotomia. Usando o Doppler colorido foram avaliados: velocidade sistólica máxima, velocidade diastólica final e índice de resistência das artéria central da retina, artéria ciliar posterior curta temporal e artéria oftálmica. As avaliações foram feitas antes e depois do uso da brimonidina. Resultados: O tartarato de brimonidina a 0,2% aumentou significativamente a velocidade sistólica máxima (28,24 para 34,23 cm/seg e velocidade diastólica final (6,62 para 8,10 cm/seg no olho direito e reduziu o índice de resistência (0,75 para 0,71 no olho esquerdo da artéria oftálmica. Conclusão: O tartarato de brimonidina 0,2% 2x/dia aumentou significativamente a velocidade sistólica máxima e velocidade diastólica final e reduziu índice de resistência da artéria oftálmica de pacientes glaucomatosos. Este efeito sugere que a brimonidina pode beneficiar pacientes glaucomatosos com insuficiência vascular na cabeça do nervo óptico.Purpose: To evaluate a twice daily 0.2% brimonidine tartrate effect on retrobulbar circulation with color Doppler in glaucomatous patients. Methods: Both eyes of sixteen patients with glaucoma were studied. Using a Color Doppler imaging, peak systolic, end diastolic velocity and resistive index was determined in the ophthalmic artery, central retinal artery and temporal short posterior ciliary artery before and after 0.2% brimonidine treatment. Results: 0.2% brimonidine tartrate significantly improved peak systolic (28.24 to 34.23 cm/seg and end diastolic velocities (6.72 to 8.10 cm/seg in the right eye and decreased resistive index (0.75 to 0.71 in the ophthalmic artery of the left eye. Conclusions: A

  11. Two-dimensional gauge theoretic supergravities

    Science.gov (United States)

    Cangemi, D.; Leblanc, M.

    1994-05-01

    We investigate two-dimensional supergravity theories, which can be built from a topological and gauge invariant action defined on an ordinary surface. One is the N = 1 supersymmetric extension of the Jackiw-Teitelboim model presented by Chamseddine in a superspace formalism. We complement the proof of Montano, Aoaki and Sonnenschein that this extension is topological and gauge invariant, based on the graded de Sitter algebra. Not only do the equations of motion correspond to the supergravity ones and do gauge transformations encompass local supersymmetries, but we also identify the ∫-theory with the superfield formalism action written by Chamseddine. Next, we show that the N = 1 supersymmetric extension of string-inspired two-dimensional dilaton gravity put forward by Park and Strominger cannot be written as a ∫-theory. As an alternative, we propose two topological and gauge theories that are based on a graded extension of the extended Poincaré algebra and satisfy a vanishing-curvature condition. Both models are supersymmetric extensions of the string-inspired dilaton gravity.

  12. Two-Dimensional Theory of Scientific Representation

    Directory of Open Access Journals (Sweden)

    A Yaghmaie

    2013-03-01

    Full Text Available Scientific representation is an interesting topic for philosophers of science, many of whom have recently explored it from different points of view. There are currently two competing approaches to the issue: cognitive and non-cognitive, and each of them claims its own merits over the other. This article tries to provide a hybrid theory of scientific representation, called Two-Dimensional Theory of Scientific Representation, which has the merits of the two accounts and is free of their shortcomings. To do this, we will argue that although scientific representation needs to use the notion of intentionality, such a notion is defined and realized in a simply structural form contrary to what cognitive approach says about intentionality. After a short introduction, the second part of the paper is devoted to introducing theories of scientific representation briefly. In the third part, the structural accounts of representation will be criticized. The next step is to introduce the two-dimensional theory which involves two key components: fixing and structural fitness. It will be argued that fitness is an objective and non-intentional relation, while fixing is intentional.

  13. Two-dimensional shape memory graphene oxide

    Science.gov (United States)

    Chang, Zhenyue; Deng, Junkai; Chandrakumara, Ganaka G.; Yan, Wenyi; Liu, Jefferson Zhe

    2016-06-01

    Driven by the increasing demand for micro-/nano-technologies, stimuli-responsive shape memory materials at nanoscale have recently attracted great research interests. However, by reducing the size of conventional shape memory materials down to approximately nanometre range, the shape memory effect diminishes. Here, using density functional theory calculations, we report the discovery of a shape memory effect in a two-dimensional atomically thin graphene oxide crystal with ordered epoxy groups, namely C8O. A maximum recoverable strain of 14.5% is achieved as a result of reversible phase transition between two intrinsically stable phases. Our calculations conclude co-existence of the two stable phases in a coherent crystal lattice, giving rise to the possibility of constructing multiple temporary shapes in a single material, thus, enabling highly desirable programmability. With an atomic thickness, excellent shape memory mechanical properties and electric field stimulus, the discovery of a two-dimensional shape memory graphene oxide opens a path for the development of exceptional micro-/nano-electromechanical devices.

  14. 彩色多普勒超声对早期小腿肌间静脉丛血栓的诊断及漏诊分析%Color Doppler ultrasound in early diagnosis and misdiagnosis of calf muscle venous plexus thrombosis

    Institute of Scientific and Technical Information of China (English)

    齐春凤; 毕超

    2011-01-01

    目的 探讨彩色多普勒超声对小腿肌间静脉丛血栓的诊断价值及漏诊原因.方法 回顾性分析41例临床确诊为小腿肌间静脉丛血栓患者的二维超声与彩色多普勒超声检查资料及超声随访情况.结果 41例临床确诊为小腿肌间静脉丛血栓的患者中,彩色多普勒超声确诊39例,超声检查的早期确诊率在95%以上,其中单肢病变33例,包括右侧12例,左侧21例,双侧病变3例;合并同侧主干血栓3例;漏诊2例.经过临床溶栓治疗后患者临床症状减轻或消失,经彩色多普勒检查证实血栓部分消失或完全消失.结论 彩色多普勒超声可以显示血栓的形态、类型、位置、管腔阻塞情况、血流状态,并且可以评价其严重程度,对治疗效果可以进行动态评估,是一种无创、快捷、准确的可重复检查的诊断方法.%Objective The causes of diagnosis and misdiagnosis for the calf muscle venous plexus thrombosis by Doppler ultrasound were to discuss. Methods A total of 41 cases diagnosed as calf muscle venous plexus thrombosis between the two-dimensional ultrasound, color Doppler ultrasound and ultrasound follow-up information were retrospectively analysed. Results Of all 41 cases diagnosed between the calf muscle venous plexus thrombosis, 39 cases were diagnosed by color doppler ultrasound with an early diagnosis rate of 95% including one limb lesion in 36 cases, the right side in 12 cases, 21 left cases, three cases of ipsilateral trunk thrombosis, bilateral lesions in 3 cases; and missed in 2 cases. After thrombolytic therapy, the patients with clinical symptoms were improved or disappeared, some of thrombosis by color Doppler validation disappeared or completely disappeared. Conclusion Color Doppler ultrasound can show blood clots form, type, location, lumen obstruction, blood flow, and can dynamically evaluate the severity of the treatment effect, which is a non-invasive, fast, accurate and repeatable diagnostic

  15. Existence and Stability of Two-Dimensional Compact-Like Discrete Breathers in Discrete Two-Dimensional Monatomic Square Lattices

    Institute of Scientific and Technical Information of China (English)

    XU Quan; TIAN Qiang

    2007-01-01

    Two-dimensional compact-like discrete breathers in discrete two-dimensional monatomic square lattices are investigated by discussing a generafized discrete two-dimensional monatomic model.It is proven that the twodimensional compact-like discrete breathers exist not only in two-dimensional soft Ф4 potentials but also in hard two-dimensional Ф4 potentials and pure two-dimensional K4 lattices.The measurements of the two-dimensional compact-like discrete breather cores in soft and hard two-dimensional Ф4 potential are determined by coupling parameter K4,while those in pure two-dimensional K4 lattices have no coupling with parameter K4.The stabilities of the two-dimensional compact-like discrete breathers correlate closely to the coupling parameter K4 and the boundary condition of lattices.

  16. 成人心室双人口彩色多普勒超声心动图特征研究%Image characteristics of color Doppler echocardiography in adults with double-inlet ventricle

    Institute of Scientific and Technical Information of China (English)

    侯传举; 邹苏娅; 邓东安; 朱鲜阳; 韩秀敏; 刘剑立; 胡斌; 王巧玲

    2011-01-01

    Objectives To explore the image characteristics of color Doppler echocardiography (CDE) in adults with double-inlet ventricle (DIV). Methods Thirty-two adult patients with DIV were examined by CDE, and angiocardiography results were taken for contrast. Among them, 25 cases were confirmed by operation. Results Thirty adult cases were accurately diagnosed as DIV by CDE, and the accuracy rate reached 93.8% (30/32). Two cases were misdiagnosed as double-outlet right ventricle. The CDE characteristics in adults with DIV were as below; (1)Apical fourchamber views of two-dimensional echocardiography (2DE) showed intact atrial septum and total echo loss of ventricular septum. During systole, two atrioventricular valves closed, the"+"sign was replaced by"T" sign of 2DE; and during diastole, two atrioventricular valves opened to the one common ventricle. Color Doppler flow imaging (CDFI) showed that flow signals from the two atrium entered one common ventricle through two atrioventricular valves.(2)According to the features of the common ventricle on apical four-chamber view of 2DE, the ventricle of DIV could be devided into 3 types, as type A(65.6%, 21/32) with delicate echo in endocardium and trabecular muscles, type B(6.3%,2/32) with coarse echo, and type C (28.1%, 9/32), bulboventricular ridge could be seen in the apex of the common ventricle. (3)Type of the great arteries could be judged by view of parastemal short axis. Type I showed normal relationship of the two great arteries (15.6%, 5/32). Type Ⅱ and Ⅲ showed the same two circular echo signals of the two great arteries, but with different spatial relationships of the two circles, type Ⅱ (21.9%, 7/32) showed the two circles located in anterior right-posterior left direction and type Ⅲ (62.5%, 20/32) showed the two circles in anterior left-posterior right direction. The size of the two circles could be used to distinguish between pulmonary stenosis and pulmonary hypertension. Pulmonary stenosis(96.9%, 31

  17. Ultrasonography and color Doppler in juvenile idiopathic arthritis: diagnosis and follow-up of ultrasound-guided steroid injection in the ankle region. A descriptive interventional study

    Directory of Open Access Journals (Sweden)

    Boesen Mikael

    2011-01-01

    Full Text Available Abstract Background The ankle region is frequently involved in juvenile idiopathic arthritis (JIA but difficult to examine clinically due to its anatomical complexity. The aim of the study was to evaluate the role of ultrasonography (US of the ankle and midfoot (ankle region in JIA. Doppler-US detected synovial hypertrophy, effusion and hyperemia and US was used for guidance of steroid injection and to assess treatment efficacy. Methods Forty swollen ankles regions were studied in 30 patients (median age 6.5 years, range 1-16 years with JIA. All patients were assessed clinically, by US (synovial hypertrophy, effusion and by color Doppler (synovial hyperemia before and 4 weeks after US-guided steroid injection. Results US detected 121 compartments with active disease (joints, tendon sheaths and 1 ganglion cyst. Multiple compartments were involved in 80% of the ankle regions. The talo-crural joint, posterior subtalar joint, midfoot joints and tendon sheaths were affected in 78%, 65%, 30% and 55% respectively. Fifty active tendon sheaths were detected, and multiple tendons were involved in 12 of the ankles. US-guidance allowed accurate placement of the corticosteroid in all 85 injected compartments, with a low rate of subcutaneous atrophy (4,7%. Normalization or regression of synovial hypertrophy was obtained in 89%, and normalization of synovial hyperemia in 89%. Clinical resolution of active arthritis was noted in 72% of the ankles. Conclusions US enabled exact anatomical location of synovial inflammation in the ankle region of JIA patients. The talo-crural joint was not always involved. Disease was frequently found in compartments difficult to evaluate clinically. US enabled exact guidance of steroid injections, gave a low rate of subcutaneous atrophy and was proved valuable for follow-up examinations. Normalization or regression of synovial hypertrophy and hyperemia was achieved in most cases, which supports the notion that US is an important

  18. Hemodynamic Changes on Color Doppler Flow Imaging and Intravenous Contrast-enhanced Ultrasound for Assessing Transplanted Liver and Early Diagnosis of Complications

    Institute of Scientific and Technical Information of China (English)

    Daozhong HUANG; Yanchao CHEN; Kaiyan LI; Qingping ZHANG

    2008-01-01

    The value of color Doppler flow imaging (CDFI) and intravenous contrast-enhanced ultrasound (CEUS) for assessing the transplanted liver and early diagnosing complications by examining hemodynamic changes was discussed. Seventy-five patients with orthotopic liver transplantation (OLT) underwent CDFI. The following parameters were measured: peak systolic velocity (PS), resistance index (RI) and Doppler perfusion index (DPI) of the hepatic artery (HA), time average velocity (TAV) of portal vein (PV) and velocity of hepatic vein (HV) in different stages post-operation. And 11 patients of them received CEUS. Thirty healthy subjects were enrolled as controls. The results showed that: (1) In 23 patients without obvious complications, TAV of PV within 15 days post-operation was significantly higher than in controls (P<0.05), PS and DPI of HA within 7 days postoperation were lower, but RI was higher than in controls (P<0.05); (2) When the hepatic artery thrombosis (HAT) occurred, PS and DPI of HA were obviously decreased, but TAV of PV significantly increased like a high saw-tooth wave; (3) While rejection occurred, both TAV of PV and PS of HA were decreased with the increase in RI of HA, and the triphasic wave of HV disappeared and displayed as saw-tooth wave; (4) The incidence of biliary complications in liver transplantation was in-creased when DPI was reduced; (5) Seven cases of hepatic carcinoma relapse after OLT demonstrated hyperecho in the arterial phase and hypoecho in the portal and later phase on CEUS; (6) In 2 cases of HA thrombus, there was no visualized enhancement in arterial phase of CEUS, but enhancement during the portal vein and parenchymal phase. It was concluded that the hemodynamic changes of PV, HA and HV in the transplanted liver are valuable for assessing the transplanted liver and early diagnosing complications on CDFI and CEUS.

  19. Scar or recurrence - comparison of MRI and color-coded ultrasound with echo signal amplifiers; Narbe oder Rezidiv? Einsatz der signalverstaerkten Doppler-Sonographie im Vergleich zur MRT

    Energy Technology Data Exchange (ETDEWEB)

    Aichinger, U.; Schulz-Wendtland, R.; Lell, M.; Bautz, W. [Institut fuer Diagnostische Radiologie, Erlangen Univ., Nuernberg (Germany); Kraemer, S. [Klinik fuer Frauenheilkunde, Friedrich-Alexander-Universitaet Erlangen, Nuernberg (Germany)

    2002-11-01

    Purpose: MRI is the most reliable method to differentiate scar and recurrent carcinoma of the breast after surgical treatment. This study compares MRI and color-coded ultrasound with and without echo signal amplifier (ESA). Materials and Methods: Forty-two patients with suspected recurrent tumors were enrolled in this prospective study, with 38 patients after breast conserving therapy and 4 after mastectomy. All patients had a clinical examination, mammography (n=38), real time ultrasound (US), color-coded ultrasound without and with ESA (Levovist {sup trademark}, Schering, Berlin), and dynamic MRI. The criteria used for duplex ultrasound were tumor vascularisation and flow pattern. The results were compared with histologic findings or the results of follow-up examinations for at least 12 months. Results: The detection of penetrating or central vessels proved to be an accurate sign of malignancy in duplex ultrasound. With the application of ESA, additional vessels were detected within the lesions, increasing the diagnostic accuracy (83% with ESA versus 79% without ESA). The sensitivity of color-coded ultrasound improved from 64% to 86% with echo signal amplifier. The specificity was 86% without and 82% with echo signal amplifier. MRI was found to have a sensitivity fo 100% and a specificity of 82%. The same 5 lesions were false positive on MRI and color-coded US after Levovist {sup trademark}. No lesion without signs of vascularity within or in its vicinity was malignant. Conclusion: Color-coded ultrasound seems to be a promising method in the differentiation between scar and recurrence. Lesions with penetrating or central vessels have a high probability of being malignant, whereas lesions without any signs of vascularity inside or nearby have a high probability of being benign. Advantage of contrast-enhanced US is its ubiquitous availability. (orig.) [German] Studienziel: Die MRT zeigt in der Rezidiverkennung nach behandeltem Mammakarzinom die hoechste

  20. Optimal excitation of two dimensional Holmboe instabilities

    CERN Document Server

    Constantinou, Navid C

    2010-01-01

    Highly stratified shear layers are rendered unstable even at high stratifications by Holmboe instabilities when the density stratification is concentrated in a small region of the shear layer. These instabilities may cause mixing in highly stratified environments. However these instabilities occur in tongues for a limited range of parameters. We perform Generalized Stability analysis of the two dimensional perturbation dynamics of an inviscid Boussinesq stratified shear layer and show that Holmboe instabilities at high Richardson numbers can be excited by their adjoints at amplitudes that are orders of magnitude larger than by introducing initially the unstable mode itself. We also determine the optimal growth that obtains for parameters for which there is no instability. We find that there is potential for large transient growth regardless of whether the background flow is exponentially stable or not and that the characteristic structure of the Holmboe instability asymptotically emerges for parameter values ...

  1. Phonon hydrodynamics in two-dimensional materials.

    Science.gov (United States)

    Cepellotti, Andrea; Fugallo, Giorgia; Paulatto, Lorenzo; Lazzeri, Michele; Mauri, Francesco; Marzari, Nicola

    2015-03-06

    The conduction of heat in two dimensions displays a wealth of fascinating phenomena of key relevance to the scientific understanding and technological applications of graphene and related materials. Here, we use density-functional perturbation theory and an exact, variational solution of the Boltzmann transport equation to study fully from first-principles phonon transport and heat conductivity in graphene, boron nitride, molybdenum disulphide and the functionalized derivatives graphane and fluorographene. In all these materials, and at variance with typical three-dimensional solids, normal processes keep dominating over Umklapp scattering well-above cryogenic conditions, extending to room temperature and more. As a result, novel regimes emerge, with Poiseuille and Ziman hydrodynamics, hitherto typically confined to ultra-low temperatures, characterizing transport at ordinary conditions. Most remarkably, several of these two-dimensional materials admit wave-like heat diffusion, with second sound present at room temperature and above in graphene, boron nitride and graphane.

  2. Probabilistic Universality in two-dimensional Dynamics

    CERN Document Server

    Lyubich, Mikhail

    2011-01-01

    In this paper we continue to explore infinitely renormalizable H\\'enon maps with small Jacobian. It was shown in [CLM] that contrary to the one-dimensional intuition, the Cantor attractor of such a map is non-rigid and the conjugacy with the one-dimensional Cantor attractor is at most 1/2-H\\"older. Another formulation of this phenomenon is that the scaling structure of the H\\'enon Cantor attractor differs from its one-dimensional counterpart. However, in this paper we prove that the weight assigned by the canonical invariant measure to these bad spots tends to zero on microscopic scales. This phenomenon is called {\\it Probabilistic Universality}. It implies, in particular, that the Hausdorff dimension of the canonical measure is universal. In this way, universality and rigidity phenomena of one-dimensional dynamics assume a probabilistic nature in the two-dimensional world.

  3. Two-dimensional position sensitive neutron detector

    Indian Academy of Sciences (India)

    A M Shaikh; S S Desai; A K Patra

    2004-08-01

    A two-dimensional position sensitive neutron detector has been developed. The detector is a 3He + Kr filled multiwire proportional counter with charge division position readout and has a sensitive area of 345 mm × 345 mm, pixel size 5 mm × 5 mm, active depth 25 mm and is designed for efficiency of 70% for 4 Å neutrons. The detector is tested with 0.5 bar 3He + 1.5 bar krypton gas mixture in active chamber and 2 bar 4He in compensating chamber. The pulse height spectrum recorded at an anode potential of 2000 V shows energy resolution of ∼ 25% for the 764 keV peak. A spatial resolution of 8 mm × 6 mm is achieved. The detector is suitable for SANS studies in the range of 0.02–0.25 Å-1.

  4. Two-dimensional heterostructures for energy storage

    Science.gov (United States)

    Pomerantseva, Ekaterina; Gogotsi, Yury

    2017-07-01

    Two-dimensional (2D) materials provide slit-shaped ion diffusion channels that enable fast movement of lithium and other ions. However, electronic conductivity, the number of intercalation sites, and stability during extended cycling are also crucial for building high-performance energy storage devices. While individual 2D materials, such as graphene, show some of the required properties, none of them can offer all properties needed to maximize energy density, power density, and cycle life. Here we argue that stacking different 2D materials into heterostructured architectures opens an opportunity to construct electrodes that would combine the advantages of the individual building blocks while eliminating the associated shortcomings. We discuss characteristics of common 2D materials and provide examples of 2D heterostructured electrodes that showed new phenomena leading to superior electrochemical performance. We also consider electrode fabrication approaches and finally outline future steps to create 2D heterostructured electrodes that could greatly expand current energy storage technologies.

  5. Rationally synthesized two-dimensional polymers.

    Science.gov (United States)

    Colson, John W; Dichtel, William R

    2013-06-01

    Synthetic polymers exhibit diverse and useful properties and influence most aspects of modern life. Many polymerization methods provide linear or branched macromolecules, frequently with outstanding functional-group tolerance and molecular weight control. In contrast, extending polymerization strategies to two-dimensional periodic structures is in its infancy, and successful examples have emerged only recently through molecular framework, surface science and crystal engineering approaches. In this Review, we describe successful 2D polymerization strategies, as well as seminal research that inspired their development. These methods include the synthesis of 2D covalent organic frameworks as layered crystals and thin films, surface-mediated polymerization of polyfunctional monomers, and solid-state topochemical polymerizations. Early application targets of 2D polymers include gas separation and storage, optoelectronic devices and membranes, each of which might benefit from predictable long-range molecular organization inherent to this macromolecular architecture.

  6. Janus Spectra in Two-Dimensional Flows

    Science.gov (United States)

    Liu, Chien-Chia; Cerbus, Rory T.; Chakraborty, Pinaki

    2016-09-01

    In large-scale atmospheric flows, soap-film flows, and other two-dimensional flows, the exponent of the turbulent energy spectra, α , may theoretically take either of two distinct values, 3 or 5 /3 , but measurements downstream of obstacles have invariably revealed α =3 . Here we report experiments on soap-film flows where downstream of obstacles there exists a sizable interval in which α transitions from 3 to 5 /3 for the streamwise fluctuations but remains equal to 3 for the transverse fluctuations, as if two mutually independent turbulent fields of disparate dynamics were concurrently active within the flow. This species of turbulent energy spectra, which we term the Janus spectra, has never been observed or predicted theoretically. Our results may open up new vistas in the study of turbulence and geophysical flows.

  7. Local doping of two-dimensional materials

    Science.gov (United States)

    Wong, Dillon; Velasco, Jr, Jairo; Ju, Long; Kahn, Salman; Lee, Juwon; Germany, Chad E.; Zettl, Alexander K.; Wang, Feng; Crommie, Michael F.

    2016-09-20

    This disclosure provides systems, methods, and apparatus related to locally doping two-dimensional (2D) materials. In one aspect, an assembly including a substrate, a first insulator disposed on the substrate, a second insulator disposed on the first insulator, and a 2D material disposed on the second insulator is formed. A first voltage is applied between the 2D material and the substrate. With the first voltage applied between the 2D material and the substrate, a second voltage is applied between the 2D material and a probe positioned proximate the 2D material. The second voltage between the 2D material and the probe is removed. The first voltage between the 2D material and the substrate is removed. A portion of the 2D material proximate the probe when the second voltage was applied has a different electron density compared to a remainder of the 2D material.

  8. Two-dimensional fourier transform spectrometer

    Energy Technology Data Exchange (ETDEWEB)

    DeFlores, Lauren; Tokmakoff, Andrei

    2016-10-25

    The present invention relates to a system and methods for acquiring two-dimensional Fourier transform (2D FT) spectra. Overlap of a collinear pulse pair and probe induce a molecular response which is collected by spectral dispersion of the signal modulated probe beam. Simultaneous collection of the molecular response, pulse timing and characteristics permit real time phasing and rapid acquisition of spectra. Full spectra are acquired as a function of pulse pair timings and numerically transformed to achieve the full frequency-frequency spectrum. This method demonstrates the ability to acquire information on molecular dynamics, couplings and structure in a simple apparatus. Multi-dimensional methods can be used for diagnostic and analytical measurements in the biological, biomedical, and chemical fields.

  9. Two-dimensional fourier transform spectrometer

    Science.gov (United States)

    DeFlores, Lauren; Tokmakoff, Andrei

    2013-09-03

    The present invention relates to a system and methods for acquiring two-dimensional Fourier transform (2D FT) spectra. Overlap of a collinear pulse pair and probe induce a molecular response which is collected by spectral dispersion of the signal modulated probe beam. Simultaneous collection of the molecular response, pulse timing and characteristics permit real time phasing and rapid acquisition of spectra. Full spectra are acquired as a function of pulse pair timings and numerically transformed to achieve the full frequency-frequency spectrum. This method demonstrates the ability to acquire information on molecular dynamics, couplings and structure in a simple apparatus. Multi-dimensional methods can be used for diagnostic and analytical measurements in the biological, biomedical, and chemical fields.

  10. FACE RECOGNITION USING TWO DIMENSIONAL LAPLACIAN EIGENMAP

    Institute of Scientific and Technical Information of China (English)

    Chen Jiangfeng; Yuan Baozong; Pei Bingnan

    2008-01-01

    Recently,some research efforts have shown that face images possibly reside on a nonlinear sub-manifold. Though Laplacianfaces method considered the manifold structures of the face images,it has limits to solve face recognition problem. This paper proposes a new feature extraction method,Two Dimensional Laplacian EigenMap (2DLEM),which especially considers the manifold structures of the face images,and extracts the proper features from face image matrix directly by using a linear transformation. As opposed to Laplacianfaces,2DLEM extracts features directly from 2D images without a vectorization preprocessing. To test 2DLEM and evaluate its performance,a series of ex-periments are performed on the ORL database and the Yale database. Moreover,several experiments are performed to compare the performance of three 2D methods. The experiments show that 2DLEM achieves the best performance.

  11. Equivalency of two-dimensional algebras

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Gildemar Carneiro dos; Pomponet Filho, Balbino Jose S. [Universidade Federal da Bahia (UFBA), BA (Brazil). Inst. de Fisica

    2011-07-01

    Full text: Let us consider a vector z = xi + yj over the field of real numbers, whose basis (i,j) satisfy a given algebra. Any property of this algebra will be reflected in any function of z, so we can state that the knowledge of the properties of an algebra leads to more general conclusions than the knowledge of the properties of a function. However structural properties of an algebra do not change when this algebra suffers a linear transformation, though the structural constants defining this algebra do change. We say that two algebras are equivalent to each other whenever they are related by a linear transformation. In this case, we have found that some relations between the structural constants are sufficient to recognize whether or not an algebra is equivalent to another. In spite that the basis transform linearly, the structural constants change like a third order tensor, but some combinations of these tensors result in a linear transformation, allowing to write the entries of the transformation matrix as function of the structural constants. Eventually, a systematic way to find the transformation matrix between these equivalent algebras is obtained. In this sense, we have performed the thorough classification of associative commutative two-dimensional algebras, and find that even non-division algebra may be helpful in solving non-linear dynamic systems. The Mandelbrot set was used to have a pictorial view of each algebra, since equivalent algebras result in the same pattern. Presently we have succeeded in classifying some non-associative two-dimensional algebras, a task more difficult than for associative one. (author)

  12. 灰阶超声及彩色多普勒超声诊断眼眶神经鞘瘤的价值%Value of Gray-scale Ultrasound and Color Doppler Ultrasound in the Diagnosis of Orbital Schwannoma

    Institute of Scientific and Technical Information of China (English)

    向彦霖; 罗孝勇; 陆薇

    2014-01-01

    Objective To explore the value of gray-scale ultrasound and color doppler ultrasound in the diagnosis of orbital schwannoma disease. Methods Confirmed by pathology were retrospectively analyzed eyes schwannoma of ultrasound. Results 7 cases of orbital schwannoma are characterized by a complete capsular, forms the rule, bet er sound permeability, color doppler ultrasound can display color blood flow signal.Conclusion Gray-scale sonography with color doppler ultrasound in the diagnosis of orbital schwannoma has certain diagnostic value.%目的:探讨灰阶超声及彩色多普勒超声在诊断眼眶神经鞘瘤疾病中的应用价值。方法回顾性分析7例经病理证实的眼眶神经鞘瘤的超声检查声像图特征。结果7例眼眶神经鞘瘤二维声像图均表现为有完整的包膜,形态较规则,透声性较好,彩色多普勒超声检查均可显示彩色血流信号。结果灰阶超声合并彩色多普勒超声检查在诊断眼眶神经鞘瘤中具有一定的诊断价值。

  13. Diagnostic Value of Cervical Cancer Using Three Dimensional Energy Color Doppler Ultrasound%宫颈癌应用三维能量彩超的诊断价值研究

    Institute of Scientific and Technical Information of China (English)

    吴侠

    2015-01-01

    Objective To study the three dimensional energy color doppler ultrasound is applied to the value of cervical cancer diagnosis.Methods Selected 2014 and 2015,76 patients with early cervical cancer,for patients with color doppler examination and three dimensional energy color doppler ultrasound, and record the data,stored the image.Results The differences between two testing ways was smaler,three dimensional energy color doppler ultrasound results of 58 cases of malignant tumor,18 cases of benign tumor,color doppler examination results of 47 cases of malignant tumor,29 cases of benign tumor.Conclusion The two kinds of detection methods are able to clearly show the cervical lesions,as wel as the internal blood flow of the tumor,the energies of the three dimensional colour to exceed examination used in the clinical diagnosis of cervical cancer,and complementary to the color doppler ultrasound examination,can improve the accuracy of diagnosis.%目的:研究三维能量彩超应用于宫颈癌诊断的价值;方法选取2014年~2015年的76例早期宫颈癌患者,对患者行彩色多普勒检查以及三维能量彩超检查,并记录数据、存储图像。结果两种检测方式用时差异较小,三维能量彩超检查结果为58例恶性肿瘤,18例良性肿瘤;彩色多普勒检查结果为47例恶性肿瘤,29例良性肿瘤。结论两种检测方式均能够清晰的显示出宫颈癌的病灶,以及肿瘤的内部血流情况。将三维能量彩超检查应用于宫颈癌的临床诊断中,与彩色多普勒超声检查互补,能够提高诊断的准确性。

  14. On numerical evaluation of two-dimensional phase integrals

    DEFF Research Database (Denmark)

    Lessow, H.; Rusch, W.; Schjær-Jacobsen, Hans

    1975-01-01

    The relative advantages of several common numerical integration algorithms used in computing two-dimensional phase integrals are evaluated.......The relative advantages of several common numerical integration algorithms used in computing two-dimensional phase integrals are evaluated....

  15. The effect of isometric exercise of the hand on the synovial blood flow in patients with rheumatoid arthritis measured by color Doppler ultrasound.

    Science.gov (United States)

    Ellegaard, Karen; Torp-Pedersen, Søren; Lund, Hans; Pedersen, Kirsten; Henriksen, Marius; Danneskiold-Samsøe, Bente; Bliddal, Henning

    2013-01-01

    In 90% of patients with rheumatoid arthritis (RA), the joints of the hand are affected. Studies of grip strength training have not indicated a negative effect on disease activity after training. Introduction of ultrasound Doppler (USD) to measure increased blood flow induced by inflammation has made it possible to investigate the direct effect on blood supply in the synovium after training. In this case-control study, 24 patients with RA with USD activity in the wrist joint participated. The USD activity was measured by the color fraction (CF) (CF = colored pixels/total number of pixels in ROI). Twenty-four patients were assigned to an 8-week grip strength training program. At baseline and after 8 weeks of training, an USD examination of the wrist joint was performed. In the training group, we measured grip strength and pain in the wrist joint. Six patients withdrew from the training because of pain or change in medication. Eighteen patients served as control group. There was a modest, not significant, decrease in the CF in response to training (1.86%; P = 0.08). Grip strength increased 8.8% after training (P = 0.055). Pain in motion deceased after training (P = 0.04). No difference in the CF was seen between the training and control groups, neither at baseline nor at follow-up (P = 0.82 and P = 0.48). Patients withdrawing from training had a significantly higher CF than the other patients (P > 0.001). The results in this study might indicate that the flow in the synovium assessed by USD is not affected by grip strength training.

  16. The Diagnostic Value of Superb Microvascular Imaging (SMI) in Detecting Blood Flow Signals of Breast Lesions: A Preliminary Study Comparing SMI to Color Doppler Flow Imaging.

    Science.gov (United States)

    Ma, Yan; Li, Gang; Li, Jing; Ren, Wei-dong

    2015-09-01

    The correlation between color Doppler flow imaging (CDFI) and Superb Microvascular Imaging (SMI) for detecting blood flow in breast lesions was investigated, as was the diagnostic value of SMI in differentiating benign from malignant breast lesions.These lesions were evaluated using both CDFI and SMI according to Adler's method. Pathologic examination showed 57 malignant lesions and 66 benign lesions. The number of blood vessels in a single mass was detected by 2 techniques (SMI and CDFI), and the difference between the 2 values (SMI-CDFI) was calculated. The optimal threshold for the diagnosis of malignant neoplasms and the diagnostic performances of SMI, CDFI, and SMI-CDFI were calculated.For the total lesions and malignant lesions alone, the difference between SMI and CDFI for detecting blood flow was significant (P < 0.01), but the difference was not significant for benign lesions (P = 0.15). The area under the receiver operating characteristic curve was 0.73 (95% confidence interval [CI]: 0.64-0.82) for CDFI; 0.81 (95% CI: 0.74-0.89) for SMI; and 0.89 (95% CI: 0.82-0.95) for SMI-CDFI. Furthermore, the modality of "SMI-CDFI" showed the best diagnostic performance.SMI provides further microvessel information in breast lesions. The diagnostic modality of "SMI-CDFI" can improve the diagnostic performance of ultrasound in the differentiation between benign and malignant masses.

  17. Nursing of renal biopsy guided by Color Doppler ultrasound%彩超引导下肾穿刺活检的护理体会

    Institute of Scientific and Technical Information of China (English)

    陈敏

    2011-01-01

    Objective To discuss the nursing strategies of renal biopsy guided by Color Doppler ultrasound. Methods Effective nursing was given to patients during preoperative, intraop-erative and postoperative stages. Results Sixty renal biopsy cases were done with 100% success rate and no serious complications occurred. Conclusion Effective preoperative, intraoperative and postoperative nursing intervention can decrease the incidence of complications of renal biopsy and it is the key to improve the success rate of renal biopsy.%目的 探讨对彩超引导下肾穿刺活检术患者的护理措施.方法 对患者进行术前、术中及术后的有效护理.结果60例患者肾穿刺活检术成功率为100%,无1例严重并发症发生.结论 有效的术前、术中及术后护理干预可以降低肾穿刺术后并发症的发生,是提高肾穿刺活检成功率的关键.

  18. Effects of finite laser pulse width on two-dimensional electronic spectroscopy

    Science.gov (United States)

    Leng, Xuan; Yue, Shuai; Weng, Yu-Xiang; Song, Kai; Shi, Qiang

    2017-01-01

    We combine the hierarchical equations of motion method and the equation-of-motion phase-matching approach to calculate two-dimensional electronic spectra of model systems. When the laser pulse is short enough, the current method reproduces the results based on third-order response function calculations in the impulsive limit. Finite laser pulse width is found to affect both the peak positions and shapes, as well as the time evolution of diagonal and cross peaks. Simulations of the two-color two-dimensional electronic spectra also show that, to observe quantum beats in the diagonal and cross peaks, it is necessary to excite the related excitonic states simultaneously.

  19. Perspective: Two-dimensional resonance Raman spectroscopy

    Science.gov (United States)

    Molesky, Brian P.; Guo, Zhenkun; Cheshire, Thomas P.; Moran, Andrew M.

    2016-11-01

    Two-dimensional resonance Raman (2DRR) spectroscopy has been developed for studies of photochemical reaction mechanisms and structural heterogeneity in complex systems. The 2DRR method can leverage electronic resonance enhancement to selectively probe chromophores embedded in complex environments (e.g., a cofactor in a protein). In addition, correlations between the two dimensions of the 2DRR spectrum reveal information that is not available in traditional Raman techniques. For example, distributions of reactant and product geometries can be correlated in systems that undergo chemical reactions on the femtosecond time scale. Structural heterogeneity in an ensemble may also be reflected in the 2D spectroscopic line shapes of both reactive and non-reactive systems. In this perspective article, these capabilities of 2DRR spectroscopy are discussed in the context of recent applications to the photodissociation reactions of triiodide and myoglobin. We also address key differences between the signal generation mechanisms for 2DRR and off-resonant 2D Raman spectroscopies. Most notably, it has been shown that these two techniques are subject to a tradeoff between sensitivity to anharmonicity and susceptibility to artifacts. Overall, recent experimental developments and applications of the 2DRR method suggest great potential for the future of the technique.

  20. Janus spectra in two-dimensional flows

    CERN Document Server

    Liu, Chien-Chia; Chakraborty, Pinaki

    2016-01-01

    In theory, large-scale atmospheric flows, soap-film flows and other two-dimensional flows may host two distinct types of turbulent energy spectra---in one, $\\alpha$, the spectral exponent of velocity fluctuations, equals $3$ and the fluctuations are dissipated at the small scales, and in the other, $\\alpha=5/3$ and the fluctuations are dissipated at the large scales---but measurements downstream of obstacles have invariably revealed $\\alpha = 3$. Here we report experiments on soap-film flows where downstream of obstacles there exists a sizable interval in which $\\alpha$ has transitioned from $3$ to $5/3$ for the streamwise fluctuations but remains equal to $3$ for the transverse fluctuations, as if two mutually independent turbulent fields of disparate dynamics were concurrently active within the flow. This species of turbulent energy spectra, which we term the Janus spectra, has never been observed or predicted theoretically. Our results may open up new vistas in the study of turbulence and geophysical flows...

  1. Comparative Two-Dimensional Fluorescence Gel Electrophoresis.

    Science.gov (United States)

    Ackermann, Doreen; König, Simone

    2018-01-01

    Two-dimensional comparative fluorescence gel electrophoresis (CoFGE) uses an internal standard to increase the reproducibility of coordinate assignment for protein spots visualized on 2D polyacrylamide gels. This is particularly important for samples, which need to be compared without the availability of replicates and thus cannot be studied using differential gel electrophoresis (DIGE). CoFGE corrects for gel-to-gel variability by co-running with the sample proteome a standardized marker grid of 80-100 nodes, which is formed by a set of purified proteins. Differentiation of reference and analyte is possible by the use of two fluorescent dyes. Variations in the y-dimension (molecular weight) are corrected by the marker grid. For the optional control of the x-dimension (pI), azo dyes can be used. Experiments are possible in both vertical and horizontal (h) electrophoresis devices, but hCoFGE is much easier to perform. For data analysis, commercial software capable of warping can be adapted.

  2. Two-dimensional hexagonal semiconductors beyond graphene

    Science.gov (United States)

    Nguyen, Bich Ha; Hieu Nguyen, Van

    2016-12-01

    The rapid and successful development of the research on graphene and graphene-based nanostructures has been substantially enlarged to include many other two-dimensional hexagonal semiconductors (THS): phosphorene, silicene, germanene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMDCs) such as MoS2, MoSe2, WS2, WSe2 as well as the van der Waals heterostructures of various THSs (including graphene). The present article is a review of recent works on THSs beyond graphene and van der Waals heterostructures composed of different pairs of all THSs. One among the priorities of new THSs compared to graphene is the presence of a non-vanishing energy bandgap which opened up the ability to fabricate a large number of electronic, optoelectronic and photonic devices on the basis of these new materials and their van der Waals heterostructures. Moreover, a significant progress in the research on TMDCs was the discovery of valley degree of freedom. The results of research on valley degree of freedom and the development of a new technology based on valley degree of freedom-valleytronics are also presented. Thus the scientific contents of the basic research and practical applications os THSs are very rich and extremely promising.

  3. Two-Dimensional Phononic Crystals: Disorder Matters.

    Science.gov (United States)

    Wagner, Markus R; Graczykowski, Bartlomiej; Reparaz, Juan Sebastian; El Sachat, Alexandros; Sledzinska, Marianna; Alzina, Francesc; Sotomayor Torres, Clivia M

    2016-09-14

    The design and fabrication of phononic crystals (PnCs) hold the key to control the propagation of heat and sound at the nanoscale. However, there is a lack of experimental studies addressing the impact of order/disorder on the phononic properties of PnCs. Here, we present a comparative investigation of the influence of disorder on the hypersonic and thermal properties of two-dimensional PnCs. PnCs of ordered and disordered lattices are fabricated of circular holes with equal filling fractions in free-standing Si membranes. Ultrafast pump and probe spectroscopy (asynchronous optical sampling) and Raman thermometry based on a novel two-laser approach are used to study the phononic properties in the gigahertz (GHz) and terahertz (THz) regime, respectively. Finite element method simulations of the phonon dispersion relation and three-dimensional displacement fields furthermore enable the unique identification of the different hypersonic vibrations. The increase of surface roughness and the introduction of short-range disorder are shown to modify the phonon dispersion and phonon coherence in the hypersonic (GHz) range without affecting the room-temperature thermal conductivity. On the basis of these findings, we suggest a criteria for predicting phonon coherence as a function of roughness and disorder.

  4. Two-dimensional topological photonic systems

    Science.gov (United States)

    Sun, Xiao-Chen; He, Cheng; Liu, Xiao-Ping; Lu, Ming-Hui; Zhu, Shi-Ning; Chen, Yan-Feng

    2017-09-01

    The topological phase of matter, originally proposed and first demonstrated in fermionic electronic systems, has drawn considerable research attention in the past decades due to its robust transport of edge states and its potential with respect to future quantum information, communication, and computation. Recently, searching for such a unique material phase in bosonic systems has become a hot research topic worldwide. So far, many bosonic topological models and methods for realizing them have been discovered in photonic systems, acoustic systems, mechanical systems, etc. These discoveries have certainly yielded vast opportunities in designing material phases and related properties in the topological domain. In this review, we first focus on some of the representative photonic topological models and employ the underlying Dirac model to analyze the edge states and geometric phase. On the basis of these models, three common types of two-dimensional topological photonic systems are discussed: 1) photonic quantum Hall effect with broken time-reversal symmetry; 2) photonic topological insulator and the associated pseudo-time-reversal symmetry-protected mechanism; 3) time/space periodically modulated photonic Floquet topological insulator. Finally, we provide a summary and extension of this emerging field, including a brief introduction to the Weyl point in three-dimensional systems.

  5. Radiation effects on two-dimensional materials

    Energy Technology Data Exchange (ETDEWEB)

    Walker, R.C. II; Robinson, J.A. [Department of Materials Science, Penn State, University Park, PA (United States); Center for Two-Dimensional Layered Materials, Penn State, University Park, PA (United States); Shi, T. [Department of Mechanical and Nuclear Engineering, Penn State, University Park, PA (United States); Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI (United States); Silva, E.C. [GlobalFoundries, Malta, NY (United States); Jovanovic, I. [Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI (United States)

    2016-12-15

    The effects of electromagnetic and particle irradiation on two-dimensional materials (2DMs) are discussed in this review. Radiation creates defects that impact the structure and electronic performance of materials. Determining the impact of these defects is important for developing 2DM-based devices for use in high-radiation environments, such as space or nuclear reactors. As such, most experimental studies have been focused on determining total ionizing dose damage to 2DMs and devices. Total dose experiments using X-rays, gamma rays, electrons, protons, and heavy ions are summarized in this review. We briefly discuss the possibility of investigating single event effects in 2DMs based on initial ion beam irradiation experiments and the development of 2DM-based integrated circuits. Additionally, beneficial uses of irradiation such as ion implantation to dope materials or electron-beam and helium-beam etching to shape materials have begun to be used on 2DMs and are reviewed as well. For non-ionizing radiation, such as low-energy photons, we review the literature on 2DM-based photo-detection from terahertz to UV. The majority of photo-detecting devices operate in the visible and UV range, and for this reason they are the focus of this review. However, we review the progress in developing 2DMs for detecting infrared and terahertz radiation. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  6. Photodetectors based on two dimensional materials

    Science.gov (United States)

    Zheng, Lou; Zhongzhu, Liang; Guozhen, Shen

    2016-09-01

    Two-dimensional (2D) materials with unique properties have received a great deal of attention in recent years. This family of materials has rapidly established themselves as intriguing building blocks for versatile nanoelectronic devices that offer promising potential for use in next generation optoelectronics, such as photodetectors. Furthermore, their optoelectronic performance can be adjusted by varying the number of layers. They have demonstrated excellent light absorption, enabling ultrafast and ultrasensitive detection of light in photodetectors, especially in their single-layer structure. Moreover, due to their atomic thickness, outstanding mechanical flexibility, and large breaking strength, these materials have been of great interest for use in flexible devices and strain engineering. Toward that end, several kinds of photodetectors based on 2D materials have been reported. Here, we present a review of the state-of-the-art in photodetectors based on graphene and other 2D materials, such as the graphene, transition metal dichalcogenides, and so on. Project supported by the National Natural Science Foundation of China (Nos. 61377033, 61574132, 61504136) and the State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences.

  7. Asymptotics for Two-dimensional Atoms

    DEFF Research Database (Denmark)

    Nam, Phan Thanh; Portmann, Fabian; Solovej, Jan Philip

    2012-01-01

    We prove that the ground state energy of an atom confined to two dimensions with an infinitely heavy nucleus of charge $Z>0$ and $N$ quantum electrons of charge -1 is $E(N,Z)=-{1/2}Z^2\\ln Z+(E^{\\TF}(\\lambda)+{1/2}c^{\\rm H})Z^2+o(Z^2)$ when $Z\\to \\infty$ and $N/Z\\to \\lambda$, where $E^{\\TF}(\\lambd......We prove that the ground state energy of an atom confined to two dimensions with an infinitely heavy nucleus of charge $Z>0$ and $N$ quantum electrons of charge -1 is $E(N,Z)=-{1/2}Z^2\\ln Z+(E^{\\TF}(\\lambda)+{1/2}c^{\\rm H})Z^2+o(Z^2)$ when $Z\\to \\infty$ and $N/Z\\to \\lambda$, where $E......^{\\TF}(\\lambda)$ is given by a Thomas-Fermi type variational problem and $c^{\\rm H}\\approx -2.2339$ is an explicit constant. We also show that the radius of a two-dimensional neutral atom is unbounded when $Z\\to \\infty$, which is contrary to the expected behavior of three-dimensional atoms....

  8. Predicting Two-Dimensional Silicon Carbide Monolayers.

    Science.gov (United States)

    Shi, Zhiming; Zhang, Zhuhua; Kutana, Alex; Yakobson, Boris I

    2015-10-27

    Intrinsic semimetallicity of graphene and silicene largely limits their applications in functional devices. Mixing carbon and silicon atoms to form two-dimensional (2D) silicon carbide (SixC1-x) sheets is promising to overcome this issue. Using first-principles calculations combined with the cluster expansion method, we perform a comprehensive study on the thermodynamic stability and electronic properties of 2D SixC1-x monolayers with 0 ≤ x ≤ 1. Upon varying the silicon concentration, the 2D SixC1-x presents two distinct structural phases, a homogeneous phase with well dispersed Si (or C) atoms and an in-plane hybrid phase rich in SiC domains. While the in-plane hybrid structure shows uniform semiconducting properties with widely tunable band gap from 0 to 2.87 eV due to quantum confinement effect imposed by the SiC domains, the homogeneous structures can be semiconducting or remain semimetallic depending on a superlattice vector which dictates whether the sublattice symmetry is topologically broken. Moreover, we reveal a universal rule for describing the electronic properties of the homogeneous SixC1-x structures. These findings suggest that the 2D SixC1-x monolayers may present a new "family" of 2D materials, with a rich variety of properties for applications in electronics and optoelectronics.

  9. The investigation of color Doppler signals enhancement of normal lower limb arteries with perfluorocarbon contrast agent%氟碳造影剂增强正常下肢动脉彩色血流信号的观察

    Institute of Scientific and Technical Information of China (English)

    吴凤林; 龚渭冰; 饶修平; 侯连兵

    2001-01-01

    目的:探讨氟碳声学造影剂对下肢动脉彩色血流信号的增强作用。方法:15例接受造影检查,超声造影剂经左前臂浅静脉弹丸式注射,剂量0.005ml/kg。结果:注射造影剂后下肢动脉彩色血流信号迅速增多、血流束增宽。高峰期持续时间20~30s(平均25±5s),消退期持续时间52~76s,平均61±6s。结论:氟碳声学造影剂能显著增强下肢动脉彩色血流信号,有助于了解深部血管血流状况。%Objective: To investigate the enhancement of color Doppler signals in normal lower limb arteries by perfluorocarbon contrast agent. Method: Fifteen cases were examined. The ultrasound contrast agents were administrated through forearm veins with bolus injection, the dosage was 0. 005ml/kg. Result: The color Doppler signals and flow width were all increased in normal lower limb arteries after the contrast agent was admitted. The peak period sustained 20~30s(means 25±5s), the decrease period lasted for 52~76s(means 61±6s). Conclusion: The results suggested perfluorocarbon contrast agent could give rise color Doppler signals in lower limb arteries, and help to show the color Doppler flow of deep vessels in lower limb.

  10. 彩超和钼靶X线定性诊断未触及肿块乳腺肿瘤的临床对比研究%Clinical Contrastive Study of Color Doppler Ultrasound and Molybdenum

    Institute of Scientific and Technical Information of China (English)

    吴小芹; 林瑞祯

    2012-01-01

    Objective: To evaluate the value of single or combined use of color doppler ultrasound and molyb -denum target X-ray in the early detection of non-palpable breast cancer. Methods: To analyze the results of color doppler ultrasound and/or molybdenum target X-ray in detecting 143 female patients with suspicious masses. The pathological results were included with the detection results as well. Results: The sensitivity of using color doppler ultrasound or molybdenum target X-ray alone and use of parallel or series were 81. 1% , 81. 1%, 95. 9% and 66. 2% respectively. Their specificity were 88. 4% , 85. 5% , 84. 1% and 89. 9% respectively. And their accuracy were 84. 6% , 83. 2% , 90. 2% and 77. 6% respectively. The false negative rates were 18. 9% , 18. 9% , 4. 1% and 33. 8% respectively. The under-receiver operating characteristic (ROC) curve area for the diagnosis of non-palpable breast cancer were 0. 847, 0. 833 , 0. 900 and 0. 7800 respectively. The accuracy of sequential use was lower than histopathology results (P 0. 05 ). The sensitivity of parallel application was higher than using color doppler ultrasound or molybdenum target X-ray alone and sequential use ( P 0.05),但并联的灵敏度高于彩超、钼靶X线单独使用或串联使用(P<0.01,P<0.01,P<0.001),并且假阴性率最低.结论:彩超和钼靶X线并联应用可作为未触及肿块乳腺癌的有效筛查和诊断方法.

  11. The Clinical Value of Color Doppler Ultrasound Diagnosis In Placental Hemorrhage%彩色多普勒超声诊断胎盘内出血的临床价值

    Institute of Scientific and Technical Information of China (English)

    刘建琴

    2014-01-01

    目的:探讨彩色超声诊断胎盘内出血的价值。方法总结分析10例胎盘异常的超声图像,确定超声诊断的特征声像图。结果超声诊断和术后临床诊断的符合率为80﹪。结论彩色超声检查是及时准确诊断胎盘内出血的无创检查方法,对于指导临床急诊救治,减少并发症有重要意义。%Objective:To explore the clinical value of Color Doppler Ultrasound diagnosis in placental hemorrhage. Methods:Analyze 10 cases of placental hemorrhage and identify the characteristics graph of Color Doppler Ultrasound. Results:In 10 cases undergoing ultrasound diagnosis,the coincidence of ultrasound diagnosis with postoperative clinical diagnosis was 80%. Conclusion:Color Doppler Ultrasound diagnosis is timely,accurate and non-invasive examination in placental hemorrhage.It is significant for guiding clinical emergency and reducing complications.

  12. Ultra-sonografia transvaginal com doppler colorido para seleção das pacientes para tratamento conservador da gravidez ectópica íntegra Transvaginal ultrasonography with color doppler to select the patients for conservative treatment of unruptured ectopic pregnancy

    Directory of Open Access Journals (Sweden)

    Julio Elito Junior

    1999-04-01

    Full Text Available Objetivo: avaliar a eficiência da ultra-sonografia (US transvaginal com Doppler colorido para a previsão dos resultados do tratamento sistêmico da gravidez ectópica íntegra com dose única de metotrexato. Pacientes e método: vinte pacientes com diagnóstico de gravidez ectópica foram incluídas no estudo. Os critérios de inclusão foram: estabilidade hemodinâmica, massa anexial com diâmetro Purpose: to evaluate the efficacy of color Doppler in the prediction of results of the systemic treatment of unruptured ectopic pregnancy with a single dose of methotrexate. Methodology: twenty patients with a diagnosis of ectopic pregnancy were included in the study. The inclusion criteria were: hemodynamic stability, adnexal mass < 5.0 cm and decline of the titers of beta-hCG less than 15% in an interval of 24 h. The exclusion criteria were hepatic or renal disease and blood dyscrasias. Follow-up was by serial determinations of beta-hCG on days 4 and 7 after the beginning of the treatment, and weekly until the titers were negative. The patients were classified into 3 groups according to color Doppler: high risk (trophoblastic flow covering more than 2/3 of the mass, medium risk (when trophoblastic flow compromised 1/3 to 2/3 of tubal mass and low risk (when trophoblastic flow covered less than 1/3 of the mass. Results: the success of the treatment with a single dose was 75% (15/20; when a second dose of MTX was used, the success rate was 85%. When comparing color Doppler with the results of the medical treatment, we had high risk in 4 patients and in all the treatment failed; medium and low risk in 16 patients, and in 15 the treatment was successful. Conclusion: color Doppler showing high risk indicated an unfavorable situation for the medical treatment with MTX, while medium and low risk in color doppler were favorable situations for the clinical treatment. However, these results should always be analyzed in association with the evolution curve

  13. OCT angiography and Color Doppler Imaging in the study of hemoperfusion in the retina and optic nerve in POAG

    Directory of Open Access Journals (Sweden)

    N. I. Kurysheva

    2016-01-01

    Full Text Available Purpose: To evaluate the hemoperfusion of Optic Nerve Disk (OND, peripapillary and macular areas, and retrobulbar blood flow in patients with primary open-angle glaucoma using optical coherence tomography with angiography (OCT-A and Сolor Doppler Imaging (CDI.Patients and Methods: 65 eyes of patients with primary open angle glaucoma (POAG and 22 eyes of age-matched healthy subjects were examined using the SD-OCT-А (RtVue xR Avanti with the AngioVue software. Retinal Thickness and Angio Flow Density (AFD were measured. AFD Disc and Peripapillary Flow Density were measured in OND and in peripapillary area. AFD Retina were evaluated in Macula inсluding Fovea- and Parafovea regions (superficial and deep of the inner retinal layers. Ophthalmic Artery (OA, Central Retinal Artery (CRA, Posterior short Ciliary Arteries (PCA, Central Retinal Vein (CRV and Vortex Vein (VV were measured by CDI. Statistical analysis was performed using SPSS version 21 and MASS library of language R. The value of each diagnostic indicator (z-value was calculated with the Wilcoxon-Mann-Whitney test and the area under the receiver operating characteristic curve (AUC.Results: Both OCT-A and CDI indicators were reduced in glaucoma compared to healthy eyes. The following indicators had the largest AUC and diagnostic value (z-value to discriminate the early glaucoma from normal eyes: AFD Retina Superficial Whole En Face (z = 3,83, p<0,0001; AUC 0,8 (0,69‑0,90, AFD Retina Deep Whole En Face (z = 3,31, p = 0,0007; AUC 0,76 (0,64‑0,88, Peripapillary Vessel Density (z = 3,2, p = 0,001; AUC 0,75 (0,63‑0,87, end-diastolic flow velocity in AO (z = 3,03, p = 0,002; AUC 0,74 (0,61‑0,86 and in TPCA (z = 2,78, p = 0,005; AUC 0,72 (0,58‑0,86; and to discriminate the early glaucoma from the advanced and far advanced stages: AFD Disc Peripapillary Inferior Temporalis (z = 5,61, p<0,0001; AUC 0,94 (0,86‑1,0 and the mean flow velocity in the CRA (z = 4,16, p<0

  14. Ecografia transfontanelar com fluxo a cores em recém-nascidos prematuros Intracranial blood flow velocities evaluated by color doppler (duplex in preterm infants

    Directory of Open Access Journals (Sweden)

    Marcelo Cardoso de Assis

    2004-03-01

    intracranial hemorrhage. They were subjected to sequencial measurements of blood flow velocities in the intracranial arteries. The gestational age of the whole group varied from 28 to 36 weeks and birth weights between 720 and 2530 g. The diagnosis of the intracerebral hemorrhages in these preterm neonates were done using high resolution gray and color scale transfontanellar ultrasonography brain scans . The ultrasound evaluations were performed in the initial 3rd, 7th and 14th day of life. The 73 preterm infants were evaluated with sequencial measurements of blood flow velocity in the intracranial arteries using the Doppler technique through the anterior fontanelle. Doppler evaluation of the cerebral vessels were performed on days 3, 7, 30 and 90 of life. These evaluations were performed in the six intracranial arteries, meaning: right and left anterior and middle cerebral arteries and right and left internal carotid arteries. Doppler recordings were made using Duplex Color-Doppler system, pulse echo probe of 3,5; 5,0 and 7,5 MHz. Measuring the blood flow velocity in the cerebral arteries we obtained a maximum systolic velocity and end diastolic velocity with a rate in meters per second (m/s for each cardiac cycle. After obtaining these numerical values for these velocities we obtained the resistance index (RI or Pourcelot index. In a progressive way as the resistance index (RI values were being obtained in each stage of this study they were also being checked in the cerebral arteries of healthy preterm infants and infants with intracranial hemorrhages. We also analyzed in a comparative method the values of the resistive index between the two groups of preterm infants observing their behaviour.The results obtained when comparing the RI values in the various arteries during the different stages of the study permitted us to conclude that the RI values of healthy pre-term infants were always larger than the RI values of pre-term infants with intracranial hemorrhage. We also

  15. Interaction of two-dimensional magnetoexcitons

    Science.gov (United States)

    Dumanov, E. V.; Podlesny, I. V.; Moskalenko, S. A.; Liberman, M. A.

    2017-04-01

    We study interaction of the two-dimensional magnetoexcitons with in-plane wave vector k→∥ = 0 , taking into account the influence of the excited Landau levels (ELLs) and of the external electric field perpendicular to the surface of the quantum well and parallel to the external magnetic field. It is shown that the account of the ELLs gives rise to the repulsion between the spinless magnetoexcitons with k→∥ = 0 in the Fock approximation, with the interaction constant g decreasing inverse proportional to the magnetic field strength B (g (0) ∼ 1 / B) . In the presence of the perpendicular electric field the Rashba spin-orbit coupling (RSOC), Zeeman splitting (ZS) and nonparabolicity of the heavy-hole dispersion law affect the Landau quantization of the electrons and holes. They move along the new cyclotron orbits, change their Coulomb interactions and cause the interaction between 2D magnetoexcitons with k→∥ = 0 . The changes of the Coulomb interactions caused by the electrons and by the holes moving with new cyclotron orbits are characterized by some coefficients, which in the absence of the electric field turn to be unity. The differences between these coefficients of the electron-hole pairs forming the magnetoexcitons determine their affinities to the interactions. The interactions between the homogeneous, semihomogeneous and heterogeneous magnetoexcitons forming the symmetric states with the same signs of their affinities are attractive whereas in the case of different sign affinities are repulsive. In the heterogeneous asymmetric states the interactions have opposite signs in comparison with the symmetric states. In all these cases the interaction constant g have the dependence g (0) 1 /√{ B} .

  16. Two-dimensional materials and their prospects in transistor electronics.

    Science.gov (United States)

    Schwierz, F; Pezoldt, J; Granzner, R

    2015-05-14

    During the past decade, two-dimensional materials have attracted incredible interest from the electronic device community. The first two-dimensional material studied in detail was graphene and, since 2007, it has intensively been explored as a material for electronic devices, in particular, transistors. While graphene transistors are still on the agenda, researchers have extended their work to two-dimensional materials beyond graphene and the number of two-dimensional materials under examination has literally exploded recently. Meanwhile several hundreds of different two-dimensional materials are known, a substantial part of them is considered useful for transistors, and experimental transistors with channels of different two-dimensional materials have been demonstrated. In spite of the rapid progress in the field, the prospects of two-dimensional transistors still remain vague and optimistic opinions face rather reserved assessments. The intention of the present paper is to shed more light on the merits and drawbacks of two-dimensional materials for transistor electronics and to add a few more facets to the ongoing discussion on the prospects of two-dimensional transistors. To this end, we compose a wish list of properties for a good transistor channel material and examine to what extent the two-dimensional materials fulfill the criteria of the list. The state-of-the-art two-dimensional transistors are reviewed and a balanced view of both the pros and cons of these devices is provided.

  17. 彩色多普勒超声引导下活检结合造影在卵巢肿瘤诊断中的应用%The Application of Color Doppler Ultrasound-Guided Biopsy Combined with Angiography in the Diagnosis of Ovarian Tumors

    Institute of Scientific and Technical Information of China (English)

    廖建梅; 杨舒萍; 陈顺姬; 陆志红; 沈小玲

    2014-01-01

    目的:探讨彩色多普勒超声引导下活检结合造影在卵巢肿瘤诊断中的应用价值。方法选择2010年10月至2013年2月我院收治的经活检病理确诊的卵巢肿瘤患者180例(良性卵巢肿瘤120例,恶性卵巢肿瘤60例),所有患者都给予了二维超声、彩色多普勒超声与造影分析。结果良性肿瘤超声显示多为囊性,彩色超声显示囊壁少量点状血流;恶性肿瘤超声显示多为囊实性,彩色超声显示囊壁丰富血流。恶性肿瘤患者的动脉RI值明显高于良性肿瘤患者,对比差异有统计学意义(P<0.05)。恶性卵巢肿瘤患者的增强速率与半廓清时间明显高于良性卵巢肿瘤患者,而始增时间与达峰时间明显低于良性卵巢肿瘤患者,对比差异有统计学意义( P<0.05)。结论彩色多普勒超声引导下活检结合造影在卵巢肿瘤诊断中的应用可实时动态显示血流灌注情况,有助于提高超声对良恶性卵巢肿瘤的诊断及鉴别诊断能力。%Objective To investigate applying values of color Doppler ultrasound-guided biopsy combined with angiography in the diagnosis of ovarian tumors. Method Patients with ovarian tumor diagnosed by biopsy pathology ( 120 cases of benign ovarian tumor, 60 cases of malignant ovarian tumor) were chosen in our hospital from October 2010 to February 2013, all of whom were given the analysis of two-dimensional ultrasound, color Doppler ultrasound and angiography. Results Ultrasound showed benign tumors are mostly cystic, color ultrasound showed cystic walls were with a few dot flow;ultrasound showed malignant tumor was mainly solid, color ultrasound showed cystic walls were rich with blood flow. Arterial RI values of patients with malignant tumor were obviously higher than those of patients with benign tumor, compared difference was statistically significant (P<0.05). For the patients with malignant ovari-an tumor, the enhancement rate and half clearance time was

  18. Clinical value of the placental abruption diagnosed by color Doppler ultrasonic combining with enhancement Doppler E-flow imaging%彩色多普勒超声结合增强型能量多普勒成像诊断胎盘早剥的临床价值探讨

    Institute of Scientific and Technical Information of China (English)

    魏达友; 梁玉婷; 蔡永秋; 巫朝君; 刘思怡; 吴绍锋

    2008-01-01

    目的 探讨彩色多普勒超声结合增强型能量多普勒(E-Flow)成像诊断胎盘早剥,尤其是轻型胎盘早剥的声像图特点,为临床提供有效的诊断依据.方法 应用彩色多普勒超声结合E-Flow对50例重型胎盘早剥、23例轻型胎盘早剥的声像图及临床结局进行分析研究.结果 50例重型胎盘早剥的彩色多普勒超声结合E-Flow的诊断与临床及产后病理诊断相符,诊断符合率100%;23例轻型胎盘早剥的彩色多普勒超声结合E-Flow的诊断与临床及产后病理诊断符合19例,诊断符合率83%,漏诊、误诊4例(17%).73例胎盘早剥患者中剖宫产60例,阴道分娩13例.结论 增强型能量多普勒超声结合彩色多普勒超声成像技术对重型胎盘早剥的诊断准确率高,为轻型胎盘早剥的诊断提供了新手段,并能动态监测轻型胎盘早剥的转归.%Objective To explore the ultrasonographical characteristics of placental abruption, especially the light placental abruption that was diagnosed by color Doppler ultrasonic combining with enhancement Doppler E-flow imaging, providing diagnosis data for clinical treatment. Methods With color Doppler ultrasonic and enhancement Doppler E-flow imaging, an analysis was made on the ultrasonography and clinical result of 50 patients with heavy placental abruption and 23 patients with light placental abruption. Results The diagnosis and clinical treatment of 50 patients with heavy placental abruption who had been diagnosed by color Doppler ultrasonic combining with enhancement Doppler E-flow imaging were in conformity with the postnatal pathological diagnosis. The coincidence rate in diagnosis was 100%. Of 23 patients with light placental abruption who had been diagnosed by color Doppler ultrasonic combining with enhancement E-flow Doppler imaging, 19 cases' diagnosis and clinical treatment were in accordance with their postnatal pathological diagnosis and the coincidence rate was 83%, 4 cases were

  19. Avaliação da anatomia arterial no pé torto congênito através da ultrassonografia com doppler colorido Evaluation of arterial anatomy in congenital clubfoot with color doppler ultrasound

    Directory of Open Access Journals (Sweden)

    José Antonio Pinto

    2008-01-01

    Full Text Available OBJETIVO: Avaliação ultrassonográfica das artérias tibial anterior e posterior no pé torto congênito (PTC. MATERIAL E MÉTODO: Foram incluídos 20 pacientes portadores de PTC idiopático compreendendo 18 casos unilaterais e dois bilaterais, sendo que 17 pacientes foram submetidos a tratamento cirúrgico e três a tratamento conservador. Todos os pacientes apresentavam pés plantígrados e foram submetidos à avaliação clínica e radiográfica, seguido pelo exame de ultrassom Doppler colorido (UDC, visando a identificação das artérias tibiais anterior e posterior na altura do tornozelo. O nível funcional foi classificado pelos critérios de Lehman. RESULTADOS: Nesta série de 20 pacientes, somente em um não foi identificada a artéria tibial anterior. Nos 12 pacientes submetidos à mensuração de fluxo e calibre pelo UDC, foi encontrada uma correlação positiva entre o grau funcional do PTC e o calibre da artéria tibial anterior. Não houve redução estatisticamente significante entre o fluxo e calibre da artéria tibial anterior do lado normal em comparação com o lado alterado (nos casos de doença unilateral. CONCLUSÕES: Não houve alteração significativa da morfologia e fluxo arterial quando comparamos os lados afetado e normal. Além disso, quanto melhor o resultado clínico da correção do PTC, maior foi o calibre da artéria tibial anterior.OBJECTIVE: This investigation intended to evaluate anterior and posterior tibial arteries at the ankle joint level in congenital clubfoot, by using color Doppler ultrasound (CDU. MATERIAL AND METHOD: Twenty patients with idiopathic clubfoot were selected, from which 18 had unilateral involvement and two had bilateral involvement. Of the 18 patients with unilateral clubfoot, 16 went through surgical treatment and the other two were submitted to conservative treatment with serial casting. Of the bilateral cases, one patient was treated surgically and the other was treated with serial

  20. 彩色多普勒超声诊断甲状腺肿瘤的临床探析%Clinical Investigation on Color Doppler Ultrasound Examination in Diagnosis of Thyroid

    Institute of Scientific and Technical Information of China (English)

    申忠梅

    2015-01-01

    目的:探析甲状腺肿瘤应用彩色多普勒超声诊断的临床价值。方法选取2013年11月~2014年11月间我院收治的甲状腺肿瘤患者44例,分别给予颈部X线与超声检查,比较两组检查结果。结果彩色多普勒超声检查的特异性(95.45%)与灵敏度(81.82%)显著高于颈部X线,差异有统计学意义(P<0.05)。结论甲状腺肿瘤应用彩色多普勒超声检查快速、安全、敏感、准确,对疾病诊断、定位与术前评估意义重大,操作简单,值得推广。%Objective To investigate the clinical value of color Doppler ultrasound examination in diagnosis of thyroid tumor. Methods Select 44 thyroid tumor patients who are received and diagnosed in hospital from November 2013 to November 2014 and give these patients with neck X-ray examination and color Doppler ultrasound examination respectively. And then compare examination results of these two groups. Results Color Doppler specificity (95.45%)and its sensitivity(81.82%)are much higher than specificity and sensitivity of X-ray examination,and such a differential has statistic value (P<0.05). Conclusion Color Doppler ultrasound examination is of fast-speed,safety,sensitivity and accuracy in diagnosis of thyroid tumor,and in addition,it is of significance in diagnosis and orientation and preoperative assessment of thyroid tumor;color Doppler ultrasound examination is easy to operate and it is quite worthwhile to be clinical y applied.

  1. Ultrafast two dimensional infrared chemical exchange spectroscopy

    Science.gov (United States)

    Fayer, Michael

    2011-03-01

    The method of ultrafast two dimensional infrared (2D IR) vibrational echo spectroscopy is described. Three ultrashort IR pulses tuned to the frequencies of the vibrational transitions of interest are directed into the sample. The interaction of these pulses with the molecular vibrational oscillators produces a polarization that gives rise to a fourth pulse, the vibrational echo. The vibrational echo pulse is combined with another pulse, the local oscillator, for heterodyne detection of the signal. For fixed time between the second and third pulses, the waiting time, the first pulse is scanned. Two Fourier transforms of the data yield a 2D IR spectrum. The waiting time is increased, and another spectrum is obtained. The change in the 2D IR spectra with increased waiting time provides information on the time evolution of the structure of the molecular system under observation. In a 2D IR chemical exchange experiment, two species A and B, are undergoing chemical exchange. A's are turning into B's, and B's are turning into A's, but the overall concentrations of the species are not changing. The kinetics of the chemical exchange on the ground electronic state under thermal equilibrium conditions can be obtained 2D IR spectroscopy. A vibration that has a different frequency for the two species is monitored. At very short time, there will be two peaks on the diagonal of the 2D IR spectrum, one for A and one for B. As the waiting time is increased, chemical exchange causes off-diagonal peaks to grow in. The time dependence of the growth of these off-diagonal peaks gives the chemical exchange rate. The method is applied to organic solute-solvent complex formation, orientational isomerization about a carbon-carbon single bond, migration of a hydrogen bond from one position on a molecule to another, protein structural substate interconversion, and water hydrogen bond switching between ions and water molecules. This work was supported by the Air Force Office of Scientific

  2. Molecular assembly on two-dimensional materials

    Science.gov (United States)

    Kumar, Avijit; Banerjee, Kaustuv; Liljeroth, Peter

    2017-02-01

    Molecular self-assembly is a well-known technique to create highly functional nanostructures on surfaces. Self-assembly on two-dimensional (2D) materials is a developing field driven by the interest in functionalization of 2D materials in order to tune their electronic properties. This has resulted in the discovery of several rich and interesting phenomena. Here, we review this progress with an emphasis on the electronic properties of the adsorbates and the substrate in well-defined systems, as unveiled by scanning tunneling microscopy. The review covers three aspects of the self-assembly. The first one focuses on non-covalent self-assembly dealing with site-selectivity due to inherent moiré pattern present on 2D materials grown on substrates. We also see that modification of intermolecular interactions and molecule–substrate interactions influences the assembly drastically and that 2D materials can also be used as a platform to carry out covalent and metal-coordinated assembly. The second part deals with the electronic properties of molecules adsorbed on 2D materials. By virtue of being inert and possessing low density of states near the Fermi level, 2D materials decouple molecules electronically from the underlying metal substrate and allow high-resolution spectroscopy and imaging of molecular orbitals. The moiré pattern on the 2D materials causes site-selective gating and charging of molecules in some cases. The last section covers the effects of self-assembled, acceptor and donor type, organic molecules on the electronic properties of graphene as revealed by spectroscopy and electrical transport measurements. Non-covalent functionalization of 2D materials has already been applied for their application as catalysts and sensors. With the current surge of activity on building van der Waals heterostructures from atomically thin crystals, molecular self-assembly has the potential to add an extra level of flexibility and functionality for applications ranging

  3. Two-dimensional speckle tracking cardiac mechanics and constrictive pericarditis: systematic review.

    Science.gov (United States)

    Madeira, Marta; Teixeira, Rogério; Costa, Marco; Gonçalves, Lino; Klein, Allan L

    2016-10-01

    Transthoracic echocardiography has a pivotal role in the diagnosis of constrictive pericarditis (CP). In addition to the classic M-mode, two-dimensional and Doppler indices, newer methodologies designed to evaluate myocardial mechanics, such as two-dimensional speckle tracking echocardiography (2DSTE), provide additional diagnostic and clinical information in the context of CP. Research has demonstrated that cardiac mechanics can improve echocardiographic diagnostic accuracy of CP and aid in differentiating between constrictive and restrictive ventricular physiology. 2DSTE can also be used to assess the success of pericardiectomy and its impact on atrial and ventricular mechanics. In the course of this review, we describe cardiac mechanics in patients with CP and summarize the influence of pericardiectomy on atrial and ventricular mechanics assessed using 2DSTE.

  4. 四维彩超检查在胎儿先心病诊断中的临床应用%Clinical Application of Four-dimensional Color Doppler Ultrasonography in the Diagnosis of Fetal Congenital Heart Disease

    Institute of Scientific and Technical Information of China (English)

    谢广平; 贾立娟; 杜学谦

    2016-01-01

    ABSTRACT:Objective To analyze the application value of four-dimensional color Doppler ultrasonography in the diagnosis of fetal congenital heart disease, and to provide a reliable reference for clinical practice. Methods The research subjects in this study were 90 cases of fetus,whose gestational age were 25 to 40 weeks. All subjects were examined by four-dimensional color Doppler ultrasound. The results of four-dimensional color Doppler ultrasound examination of these studies subjects were retrospective analyzed,such as fetal heart rate, the four chamber view, the lfow of the chamber, etc..At the same time, the results of follow-up were retrospectively analyzed. The follow-up results and contrast the four-dimensional color Doppler ultrasound examination results were compared.The accuracy of the four-dimensional color Doppler ultrasound examination for diagnosis of fetal congenital heart disease were calculated ,in order to investigate the application value of four-dimensional color Doppler ultrasonography in the diagnosis of fetal congenital heart disease. Results In the study, 6 cases were diagnosed as congenital heart disease by four-dimensional color Doppler ultrasonography. Follow up results showed that 8 cases were eventually diagnosed as congenital heart disease in the study. By comparing the four-dimensional color Doppler ultrasound examination results and follow-up results, the diagnosis rate of four-dimensional color Doppler ultrasound examination was 75%, 1 cases was misdiagnosis, 1 cases was missed diagnosis. Conclusion Prenatal four-dimensional color Doppler ultrasound examination can improve the diagnostic rate of fetal congenital heart disease, and provide a reliable reference for the early intervention of congenital heart disease. Four-dimensional color Doppler ultrasound examination can be widely used in the diagnosis of fetal congenital heart disease, can provide referenc e for the early diagnosis and intervention of congenital heart disease

  5. 彩色多普勒检测胎儿三尖瓣反流产前筛查的临床意义%Clinical significance of color doppler detection in prenatal screening of fetal tricuspid regurgitation

    Institute of Scientific and Technical Information of China (English)

    王京平; 王萍平; 郑来坤

    2014-01-01

    目的:探讨彩色多普勒在中晚孕胎儿三尖瓣反流产前筛查中的临床意义及鉴别诊断。方法选择2009年3月~2012年6月就诊的11265例中晚期孕妇。观察其胎儿三尖瓣口彩色多普勒反流情况及脉冲多普勒评估流速、压差,追踪随访。结果1306例胎儿监测到三尖瓣反流,发生率11.6%。其中反流速度大于2.8m/s者46例,小于2.8m/s者1261例。结论彩色多普勒能够敏感地检出胎儿三尖瓣反流,对胎儿某些心脏疾病的诊断提供重要临床价值。%Objective To investigate the clinical significance and differential diagnosis of color doppler in the prenatal screening of middle and late pregnancy fetal tricuspid regurgitation. Methods 11265 middle and late pregnancy gravidae treated from March 2009 to June 2012 were selected. The color doppler tricuspid regurgitation situation of their fetuses was observed and the pulse doppler was used to evaluate the flow rate and pressure difference;the fetuses received follow-up visits. Results 1306 fetuses showed tricuspid regurgitation, with the incidence of 11.6%.Among them, 46 fetuses had a backflow rate over 2.8m/s and 1261 fetuses less than 2.8m/s. Conclusion Color doppler can detect fetal tricuspid regurgitation sensitively and is therefore of important clinical value for some fetal heart diseases.

  6. 肾脏巨大错构瘤的超声诊断探讨%Discussion on the diagnosisudy of giant renal hamartoma with color Doppler ultrasound

    Institute of Scientific and Technical Information of China (English)

    张清连; 张灌生; 钟跃

    2012-01-01

    Objective To discuss the value of color Doppler ultrasound on the diagnosis of giant (larger than 10cm) renal hamartoma (GRH). Methods Ultrasonic images of 9 cases with GRH confirmed by pathology after operation were retrospectively studied. Results 7 cases were diagnosed correctly by ultrasound (7/9), 1 case were mistaken as renal carcinoma (1/9) and 1 case was mistaken as adrenal gland fat tumor (1/9) in ultrasound diagnosis. The GRH shape was ellipse with clear margins. The GRH were showed high echo in 6 cases, middle echo in 2 cases and low echo in 1 case. That high alternate with low echoes were composed "stripe sign" were observed in all high echo and middle echo GRH, and there were a few bloodstream signal in these masses. The low echo GRH were not observed "stripe sign", and there were more bloodstream signal. That the protruding parts of GRH pressed the kidneys to form "press sign" were observed in all cases. The GRH with spontaneous rupture were observed cystic area in 2 cases. Both kidneys had many high echo small hamartoma sign in 6 cases. Conclusion The GRH has some features in ultrasonic images, color Doppler ultrasound has important diagnostic value for GRH, it could be considered as the first diagnostic method before operation.%目的 探讨彩色多普勒超声诊断肾脏巨大错构瘤(最大径线大于10cm)的临床应用价值.方法 回顾性分析经手术病理证实的9例肾脏巨大错构瘤的超声检查资料,并对其超声表现特征进行分析.结果 9例肾脏巨大错构瘤超声诊断正确7例(77.78%),1例误诊为肾癌(11.11%),1例误诊为肾上腺脂肪瘤(11.11%).肾脏巨大错构瘤的声像大致呈椭圆形,轮廓清晰,6例呈高回声,2例呈中等回声,1例呈低回声.高回声及中等回声肿块内皆观察到了高低回声相间的“条纹征”,且肿块内血流稀少.低回声肿块内未见“条纹征”,血流较多.9例肾脏巨大错构瘤皆观察到了肿瘤的外突部分对

  7. Application of color Doppler ultrasound in screening for fetal malformation%彩色多普勒超声在胎儿畸形筛查中的应用

    Institute of Scientific and Technical Information of China (English)

    黄嘉静

    2015-01-01

    目的:研究彩色多普勒超声在胎儿畸形筛查中的应用。方法选择2012年2月~2014年7月期间在我院进行分娩或者引产的胎儿畸形产妇共计90例。所有产妇在产前均实施过彩色多普勒超声的产前检查。对胎儿畸形的种类进行观察,以及彩色多普勒超声在胎儿畸形筛查中的诊断符合率,对不同时间段胎儿畸形筛选情况进行分析。结果彩色多普勒在胎儿畸形筛查中对无脑畸形、双胎畸形、心血管畸形、脑脊膜膨出、脑积水、泌尿系统畸形、消化道畸形、胸腹腔肿瘤以及脊柱裂方面均具有较高的诊断符合率。孕16~25周胎儿畸形筛选所占的比例75.56%显著高于孕26~35周和孕36~40周的比例,差异有统计学意义(P <0.05)。结论彩色多普勒超声在胎儿畸形筛查中是最为有效的方法,彩超操作医师在检查中应该从系统、全面、多方位、多角度出发,以此减少胎儿畸形筛选中的误诊与漏诊,进一步提高彩色多普勒超声在胎儿畸形筛查中的诊断率。%Objective To investigate the application of color Doppler ultrasound in screening for fetal malformation. Methods 90 cases of patients with maternal fetal malformation in childbirth or induced abortion were selected in our hospital from February 2012 to July 2014.All maternal prenatal prenatal examination were implemented by color Doppler ultrasound.The types of fetal malformations were observed,consistent with the diagnosis rate and color Doppler ultrasound in screening for fetal malformation,fetal malformation screening were analyzed at the different time. Results The rate of diagnosis with color Doppler in the diagnosis of fetal malformation of anencephaly,cardiovascular malformation,cerebral meningocele,hydrocephalus,malformation of the urinary system,digestive tract malformation,thoracic and abdominal tumor,spinal bifida all have good.At 16-25 weeks of gestation

  8. 彩色多普勒超声诊断下肢静脉血栓临床价值%Clinical value of color doppler ultrasound in the diagnosis of thrombus of lower extremity veins

    Institute of Scientific and Technical Information of China (English)

    巫朝君; 黄友清; 黄智勇

    2014-01-01

    Objective To investigate the clinical value of color doppler ultrasound in the diagnosis of thrombus of lower extremity veins. Methods A total of 84 patients with thrombus of lower extremity veins(DVT) underwent color Doppler ultrasound and digital subtraction angiography (DSA), and analyzed the test results comparatively. Results Color doppler ultrasound diagnosed deep vein thrombosis(DVT) in 68 cases of all 84 patients, 49 cases were in the left low-er extremity (72.1%), 19 cases were in the right lower extremity (27.9%),patients were in the left more than in the right;In all 68 patients,39 cases were in acute stage,20 cases were in sub acute stage, 9 cases were in chronic period. DSA diagnosed lower extremity DVT in 66 cases in 68 cases diagnosed by color doppler ultrasound,DSA diagnosed lower extremity DVT in 64 cases, 4 cases that examined by DSA were negative. Color doppler ultrasound diagnosed normal in 18 cases, DSA found lower extremity DVT in 2 cases. Compared with the results of DSA examination, the sensitivity and the specificity of color doppler ultrasound for diagnosing DVT were 96.97% and 88.9%, the diagnostic consistency of both methods was high (Kappa=0.78). Conclusion Color doppler ultrasound is simple, fast and repro-ducible, it is high in consistency with DSA and has important value in the diagnosis of lower extremity DVT.%目的:探讨彩色多普勒超声对下肢静脉血栓(DVT)的诊断价值。方法对84例疑诊为下肢DVT的患者分别采用彩色多普勒超声和数字减影血管造影(DSA)检查,对检查结果进行对比分析。结果所有84例患者中,彩超诊断下肢DVT68例,左下肢49例(72.1%),右下肢19例(27.9%),左侧明显多于右侧;所有68例患者中,急性期39例,亚急性期20例,慢性期9例。DSA检查诊断下肢DVT66例。彩超诊断68例中,64例DSA检查诊断为下肢DVT,4例DSA检查阴性。彩超检查正常18例中,2例经DSA检查诊断为下肢DVT

  9. 弯刀综合征的超声心动图诊断价值探讨%Value of color Doppler echocardiography in diagnosis of scimitar syndrome

    Institute of Scientific and Technical Information of China (English)

    曹睿; 刘特长; 于明华; 张明杰; 陈欣欣; 虢艳; 李健茹; 王莉

    2015-01-01

    目的:探讨弯刀综合征的经胸彩色多普勒超声心动图诊断价值。方法回顾6例弯刀综合征患儿的超声图像,结合文献分析超声心动图特征及其血流动力学。结果6例弯刀综合征患儿右位心或中位心各3例,右心扩大6例,全部或部分右肺静脉异位引流至下腔静脉各3例,6例右肺动脉发育不良,均与CT血管造影(CT angiography ,CTA)相符,其中4例经手术证实。结论弯刀综合征的超声图像特征明显,可为其早期诊断与治疗提供有价值的信息。%Objective To discuss the value of color Doppler echocardiography in diagnosis of scimitar syndrome .Methods The echocardiographic results of 6 patients with a diagnosis of scimitar syndrome were reviewed retrospectively .Their sonographic and hemodynamic characteristics were also analyzed connected with the reports in the literature .Results Three cases had dextrocardia and the others had mesocardia .All cases got right ventricular dimension enlargement .Total or partial of right pulmonary venous connection to the inferior vena cava were 3 cases respectively .All cases had right pulmonary artery hypoplasia .All of 6 cases echocardiographic results were in accordance with the findings by CT angiography and 4 cases were confirmed by operation .Conclusions The sonographic features of scimitar syndrome were obvious ,and echocardiography was contribute to early diagnosis of scimitar syndrome .

  10. Quantitative analysis of aortic regurgitation: real-time 3-dimensional and 2-dimensional color Doppler echocardiographic method--a clinical and a chronic animal study

    Science.gov (United States)

    Shiota, Takahiro; Jones, Michael; Tsujino, Hiroyuki; Qin, Jian Xin; Zetts, Arthur D.; Greenberg, Neil L.; Cardon, Lisa A.; Panza, Julio A.; Thomas, James D.

    2002-01-01

    BACKGROUND: For evaluating patients with aortic regurgitation (AR), regurgitant volumes, left ventricular (LV) stroke volumes (SV), and absolute LV volumes are valuable indices. AIM: The aim of this study was to validate the combination of real-time 3-dimensional echocardiography (3DE) and semiautomated digital color Doppler cardiac flow measurement (ACM) for quantifying absolute LV volumes, LVSV, and AR volumes using an animal model of chronic AR and to investigate its clinical applicability. METHODS: In 8 sheep, a total of 26 hemodynamic states were obtained pharmacologically 20 weeks after the aortic valve noncoronary (n = 4) or right coronary (n = 4) leaflet was incised to produce AR. Reference standard LVSV and AR volume were determined using the electromagnetic flow method (EM). Simultaneous epicardial real-time 3DE studies were performed to obtain LV end-diastolic volumes (LVEDV), end-systolic volumes (LVESV), and LVSV by subtracting LVESV from LVEDV. Simultaneous ACM was performed to obtain LVSV and transmitral flows; AR volume was calculated by subtracting transmitral flow volume from LVSV. In a total of 19 patients with AR, real-time 3DE and ACM were used to obtain LVSVs and these were compared with each other. RESULTS: A strong relationship was found between LVSV derived from EM and those from the real-time 3DE (r = 0.93, P real-time 3DE and that from ACM was observed (r = 0.73, P real-time 3DE and ACM was found (r = 0.90, P real-time 3DE for quantifying LV volumes, LVSV, and AR volumes was validated by the chronic animal study and was shown to be clinically applicable.

  11. Using the MEM-net program to report on mapping the EchoColorDoppler assessment for chronic cerebro spinal venous insufficiency

    Directory of Open Access Journals (Sweden)

    Mandolesi S

    2014-07-01

    Full Text Available Sandro Mandolesi,1 Aldo d’Alessandro,2 Ettore Manconi,3 Tarcisio Niglio,4 Augusto Orsini,5 Dimitri Mandolesi,6 Alessandro d'Alessandro,7 Francesco Fedele1 1Department of Cardiovascular and Respiratory Sciences, Sapienza University Rome, Rome, Italy; 2Department of Angiology, “T Masselli-Mascia” Hospital, San Severo (FG, Foggia, Italy; 3Department of Cardiovascular and Neurological Sciences, University of Cagliari, Cagliari, Italy; 4Istituto Superiore di Sanità, Rome, Italy; 5Department of Vascular Surgery, “Gioia” Hospital, Sora (FR, Sora, Italy; 6Medicina del lavoro Sapienza University Roma, Rome, Italy; 7Faculty of Medicine, Catholic University “Our Lady of Good Counsel,” Tirana, Albania Introduction: Chronic cerebrospinal venous insufficiency (CCSVI is characterized by multiple stenosis/obstructions affecting the principal extracranial outflow pathways of the cerebrospinal venous system. Using EchoColorDoppler (ECD to assess chronic CCSVI is a very difficult and long examination. It takes about an hour even for an expert sonographer. Methods: Hemodynamic morphological map (MEM-Net is a program that works on the Internet. All the morphological and hemodynamic data of the patient can be entered into the program’s anatomical scheme to create a map of the ECD report. The program also allows us to collect all the data during the ECD assessment and, using its algorithm, make the report uniform. Conclusion: Reporting on the map by using MEM-net shortens the time of ECD written reporting that is done automatically. The program also makes a blind control of the report and enables the use of it for scientific research. We hope that in the future everyone will use this data collection tool for all scientific work on this topic. Keywords: CCSVI, ECD, Map, cerebral venous system, sonography

  12. Numerical and experimental study of Lamb wave propagation in a two-dimensional acoustic black hole

    Science.gov (United States)

    Yan, Shiling; Lomonosov, Alexey M.; Shen, Zhonghua

    2016-06-01

    The propagation of laser-generated Lamb waves in a two-dimensional acoustic black-hole structure was studied numerically and experimentally. The geometrical acoustic theory has been applied to calculate the beam trajectories in the region of the acoustic black hole. The finite element method was also used to study the time evolution of propagating waves. An optical system based on the laser-Doppler vibration method was assembled. The effect of the focusing wave and the reduction in wave speed of the acoustic black hole has been validated.

  13. The IEA Annex 20 Two-Dimensional Benchmark Test for CFD Predictions

    DEFF Research Database (Denmark)

    Nielsen, Peter V.; Rong, Li; Cortes, Ines Olmedo

    2010-01-01

    This paper describes a benchmark test which can be used for tests of CFD predictions of room air distribution. The benchmark describes a box-like room with a supply slot along the side wall. Laser-Doppler measurements and hot-wire measurements are given for comparison with the obtained CFD...... in a supply opening, study of local emission and study of airborne chemical reactions. Therefore the web page is also a collection of information which describes the importance of the different elements of a CFD procedure. The benchmark is originally developed for test of two-dimensional flow, but the paper...

  14. The convolution theorem for two-dimensional continuous wavelet transform

    Institute of Scientific and Technical Information of China (English)

    ZHANG CHI

    2013-01-01

    In this paper , application of two -dimensional continuous wavelet transform to image processes is studied. We first show that the convolution and correlation of two continuous wavelets satisfy the required admissibility and regularity conditions ,and then we derive the convolution and correlation theorem for two-dimensional continuous wavelet transform. Finally, we present numerical example showing the usefulness of applying the convolution theorem for two -dimensional continuous wavelet transform to perform image restoration in the presence of additive noise.

  15. The Chandrasekhar's Equation for Two-Dimensional Hypothetical White Dwarfs

    CERN Document Server

    De, Sanchari

    2014-01-01

    In this article we have extended the original work of Chandrasekhar on the structure of white dwarfs to the two-dimensional case. Although such two-dimensional stellar objects are hypothetical in nature, we strongly believe that the work presented in this article may be prescribed as Master of Science level class problem for the students in physics.

  16. Beginning Introductory Physics with Two-Dimensional Motion

    Science.gov (United States)

    Huggins, Elisha

    2009-01-01

    During the session on "Introductory College Physics Textbooks" at the 2007 Summer Meeting of the AAPT, there was a brief discussion about whether introductory physics should begin with one-dimensional motion or two-dimensional motion. Here we present the case that by starting with two-dimensional motion, we are able to introduce a considerable…

  17. Spatiotemporal surface solitons in two-dimensional photonic lattices.

    Science.gov (United States)

    Mihalache, Dumitru; Mazilu, Dumitru; Lederer, Falk; Kivshar, Yuri S

    2007-11-01

    We analyze spatiotemporal light localization in truncated two-dimensional photonic lattices and demonstrate the existence of two-dimensional surface light bullets localized in the lattice corners or the edges. We study the families of the spatiotemporal surface solitons and their properties such as bistability and compare them with the modes located deep inside the photonic lattice.

  18. Explorative data analysis of two-dimensional electrophoresis gels

    DEFF Research Database (Denmark)

    Schultz, J.; Gottlieb, D.M.; Petersen, Marianne Kjerstine;

    2004-01-01

    Methods for classification of two-dimensional (2-DE) electrophoresis gels based on multivariate data analysis are demonstrated. Two-dimensional gels of ten wheat varieties are analyzed and it is demonstrated how to classify the wheat varieties in two qualities and a method for initial screening...

  19. Mechanics of Apparent Horizon in Two Dimensional Dilaton Gravity

    CERN Document Server

    Cai, Rong-Gen

    2016-01-01

    In this article, we give a definition of apparent horizon in a two dimensional general dilaton gravity theory. With this definition, we construct the mechanics of the apparent horizon by introducing a quasi-local energy of the theory. Our discussion generalizes the apparent horizons mechanics in general spherically symmetric spactimes in four or higher dimensions to the two dimensional dilaton gravity case.

  20. Topological aspect of disclinations in two-dimensional crystals

    Institute of Scientific and Technical Information of China (English)

    Qi Wei-Kai; Zhu Tao; Chen Yong; Ren Ji-Rong

    2009-01-01

    By using topological current theory, this paper studies the inner topological structure of disclinations during the melting of two-dimensional systems. From two-dimensional elasticity theory, it finds that there are topological currents for topological defects in homogeneous equation. The evolution of disclinations is studied, and the branch conditions for generating, annihilating, crossing, splitting and merging of disclinations are given.

  1. Fault-tolerance in Two-dimensional Topological Systems

    Science.gov (United States)

    Anderson, Jonas T.

    This thesis is a collection of ideas with the general goal of building, at least in the abstract, a local fault-tolerant quantum computer. The connection between quantum information and topology has proven to be an active area of research in several fields. The introduction of the toric code by Alexei Kitaev demonstrated the usefulness of topology for quantum memory and quantum computation. Many quantum codes used for quantum memory are modeled by spin systems on a lattice, with operators that extract syndrome information placed on vertices or faces of the lattice. It is natural to wonder whether the useful codes in such systems can be classified. This thesis presents work that leverages ideas from topology and graph theory to explore the space of such codes. Homological stabilizer codes are introduced and it is shown that, under a set of reasonable assumptions, any qubit homological stabilizer code is equivalent to either a toric code or a color code. Additionally, the toric code and the color code correspond to distinct classes of graphs. Many systems have been proposed as candidate quantum computers. It is very desirable to design quantum computing architectures with two-dimensional layouts and low complexity in parity-checking circuitry. Kitaev's surface codes provided the first example of codes satisfying this property. They provided a new route to fault tolerance with more modest overheads and thresholds approaching 1%. The recently discovered color codes share many properties with the surface codes, such as the ability to perform syndrome extraction locally in two dimensions. Some families of color codes admit a transversal implementation of the entire Clifford group. This work investigates color codes on the 4.8.8 lattice known as triangular codes. I develop a fault-tolerant error-correction strategy for these codes in which repeated syndrome measurements on this lattice generate a three-dimensional space-time combinatorial structure. I then develop an

  2. 用彩超检查鉴别乳房肿块良恶性的准确性研究%Application of color Doppler ultrasound in the diagnosis of breast masses

    Institute of Scientific and Technical Information of China (English)

    徐志岩; 李颖

    2015-01-01

    目的:探讨用彩超检查鉴别乳房肿块良恶性的准确性。方法:对2012年1月~2013年12月期间在我院进行检查的76例乳房肿块患者的临床资料进行回顾性研究。我院对这76例患者进行了彩超检查。结果:经彩超检查发现,这76例患者中有58例患者的乳房肿块为良性,有18例患者的乳房肿块为恶性。经病理检查后发现,18例经彩超检查被诊断为乳房肿块恶性的患者其检查结果完全准确,但在58例经彩超检查被诊断为乳房肿块良性的患者中,有3例患者的乳房肿块为恶性,误诊率为3.9%。结论:用彩超检查鉴别乳房肿块良恶性的准确性很高。而且该检查方法还具有无创、方便、快捷和廉价等优点。因此,进行彩超检查可作为临床上鉴别乳房肿块良恶性的首选方法。%Objective To explore the effect of clinical diagnosis and the method of application of color Doppler ultrasound in breast masses. Methods 76 cases of breast masses were admitted to our hospital, application of color Doppler ultrasound inspection, observation of color Doppler sonographic characteristics, flow velocity and resistance index, analysis of the comparison of results, Results of 76 cases of pathologically confirmed malignant masses in 14 cases, accounting for 18.4%, color Doppler ultrasound in the diagnosis of malignant tumor in 13 cases, and the results of pathological diagnosis coincidence rate is 92.86%. Benign tumor of 62 cases, accounting for 81.6%, color Doppler ultrasound in the diagnosis of benign lesions in 58 cases, and the results of pathological diagnosis coincidence rate is 93.54%. The total coincidence rate was 93.42%. Conclusion color Doppler ultrasound for breast mass inspection is fast and convenient, noninvasive, inexpensive, accurate and early detection can help breast masses and diagnosis, to facilitate the timely treatment, is worthy of extensive promotion and application.

  3. Correlation of ABI、color doppler ultrasound spectrum and TBI of lower extremity artery in diabetic patients%ABI与彩超频谱、TBI在糖尿病下肢动脉疾病中相关性研究

    Institute of Scientific and Technical Information of China (English)

    邓迎红; 潘玲; 宋婉华; 肖菁

    2011-01-01

    目的 探讨糖尿病下肢动脉病变踝肱指数(ABI)与超声彩色多普勒频谱、趾肱指数(TBI)相关性分析.方法 采用多功能外周血管检查仪及超声彩色多普勒检查仪对55位糖尿病患者行109例下肢动脉检查,测定ABI、TBI及彩色多普勒血流频谱.结果 A1组(0.9color doppler ultrasound spectrum and toe-brachial index (TBI) of lower extremity artery in diabetic patients. Methods ABI, TBI and color doppler ultrasound spectrum measurement were carried out on 109 lower extremity artery of 55 diabetic patients. Croups were assigned according to ABI and TBI values and the correlation of ABI and color doppler ultrasound spectrum as well as ABI and TBI. Results The changes of ABI and of color doppler ultrasound spectrum in Group A1(0.9color doppler ultrasound spectrum measurement. Early diagnosis of pathological changes of diabetic patients can be realized exactly by combing ABI、TBI and color doppler ultrasound spectrum.

  4. Invariant Subspaces of the Two-Dimensional Nonlinear Evolution Equations

    Directory of Open Access Journals (Sweden)

    Chunrong Zhu

    2016-11-01

    Full Text Available In this paper, we develop the symmetry-related methods to study invariant subspaces of the two-dimensional nonlinear differential operators. The conditional Lie–Bäcklund symmetry and Lie point symmetry methods are used to construct invariant subspaces of two-dimensional differential operators. We first apply the multiple conditional Lie–Bäcklund symmetries to derive invariant subspaces of the two-dimensional operators. As an application, the invariant subspaces for a class of two-dimensional nonlinear quadratic operators are provided. Furthermore, the invariant subspace method in one-dimensional space combined with the Lie symmetry reduction method and the change of variables is used to obtain invariant subspaces of the two-dimensional nonlinear operators.

  5. Quantitative analysis of aortic regurgitation: real-time 3-dimensional and 2-dimensional color Doppler echocardiographic method--a clinical and a chronic animal study

    Science.gov (United States)

    Shiota, Takahiro; Jones, Michael; Tsujino, Hiroyuki; Qin, Jian Xin; Zetts, Arthur D.; Greenberg, Neil L.; Cardon, Lisa A.; Panza, Julio A.; Thomas, James D.

    2002-01-01

    BACKGROUND: For evaluating patients with aortic regurgitation (AR), regurgitant volumes, left ventricular (LV) stroke volumes (SV), and absolute LV volumes are valuable indices. AIM: The aim of this study was to validate the combination of real-time 3-dimensional echocardiography (3DE) and semiautomated digital color Doppler cardiac flow measurement (ACM) for quantifying absolute LV volumes, LVSV, and AR volumes using an animal model of chronic AR and to investigate its clinical applicability. METHODS: In 8 sheep, a total of 26 hemodynamic states were obtained pharmacologically 20 weeks after the aortic valve noncoronary (n = 4) or right coronary (n = 4) leaflet was incised to produce AR. Reference standard LVSV and AR volume were determined using the electromagnetic flow method (EM). Simultaneous epicardial real-time 3DE studies were performed to obtain LV end-diastolic volumes (LVEDV), end-systolic volumes (LVESV), and LVSV by subtracting LVESV from LVEDV. Simultaneous ACM was performed to obtain LVSV and transmitral flows; AR volume was calculated by subtracting transmitral flow volume from LVSV. In a total of 19 patients with AR, real-time 3DE and ACM were used to obtain LVSVs and these were compared with each other. RESULTS: A strong relationship was found between LVSV derived from EM and those from the real-time 3DE (r = 0.93, P <.001, mean difference (3D - EM) = -1.0 +/- 9.8 mL). A good relationship between LVSV and AR volumes derived from EM and those by ACM was found (r = 0.88, P <.001). A good relationship between LVSV derived from real-time 3DE and that from ACM was observed (r = 0.73, P <.01, mean difference = 2.5 +/- 7.9 mL). In patients, a good relationship between LVSV obtained by real-time 3DE and ACM was found (r = 0.90, P <.001, mean difference = 0.6 +/- 9.8 mL). CONCLUSION: The combination of ACM and real-time 3DE for quantifying LV volumes, LVSV, and AR volumes was validated by the chronic animal study and was shown to be clinically applicable.

  6. Correlation between morphologic carotid plaque findings based on color-Doppler and CT multidetector angiography with intraopertive findings in carotid artery stenosis

    Directory of Open Access Journals (Sweden)

    Savić Živorad N.

    2010-01-01

    Full Text Available Bacground/Aim. Vast majority of patients with corotid artery sclerosis do not have transitory ischemic attacks (TIA as working to the persistent silent disease, but stroke is the first sign. Precise and early diagnosis of the carotid artery disease and plaques are very important. The aim of this study was to determine how the composition / identity of diagnostic methods, color-Doppler, ultrasonography (US CT multidetector angio (MDCTA scan and intraoperative (IO findings, as well as the morphology of plaques in patients with haemodynamic significant stenosis of the internal carotid artery. Methods. Carotid plaques were observed by two diagnostic methods, US and MDCTA, and these findings were correlated with the IO findings. Results. In 62 patients both carotid artheries were examined and 83 plaques were observed. There were 68 surgical interventions. The structure of plaques was divided into four types: lipid, fibrous, fibrocalcified and calcified plaque. US showed: lipid plaques 10.8%; fibrous 1.2%; fibrocalcified 44.6% and calcified 43.4%, and the MDCTA lipid plaques 8.4%; fibrocalcified 48.2% and calcified 43.4%. Intraoperative findings were: lipid plaques 10.3%; fibrocalcified 41.2% and calcified 48.5%. A statistically highly significant agreement between the US and MDCTA in the diagnosis of plaque morphology was obtained (Cramer's V = 0.919, p < 0.01; Lambda = 0.921, p < 0.01 and also statistically significant agreement between US and IO findings (Cramer' s V = 0.831, p < 0.01; Lambda = 0.859, p < 0.01. A statistically highly significant agreement between MDCTA and IO findings in plaque morphology was found, as well (Cramer's V = 0.815, p < 0.01; Lambda = 0.829, p < 0.01. Conclusion. There is statistically highly significant correlation between US and MDCTA diagnostic methods in the evaluation of plaque morphology in surgically significant stenosis of internal carotid artery as well as their agreement with the intraoperative finding.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2012-09-15

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

  8. 多普勒超声对阳萎分度诊断的研究%Study of color Doppler flow imaging for the diagnosis of impotence grading

    Institute of Scientific and Technical Information of China (English)

    滕剑波; 玄绪军; 张先东

    2000-01-01

    目的 探讨不同硬度状态阴茎血管血流参数的差异,为阳萎分度诊断提供客观依据.方法 应用多普勒超声检测74例阳萎患者,海绵体注药前后,连续测定海绵体动脉及背动脉收缩期峰值流速(PSV)、舒张期末血流速度(EDV)、阻力指数(RI)和背深静脉血流速度,对比分析不同硬度诸参数的差异及与硬度的关系.结果 多普勒超声根据海绵体动脉PSV减小及EDV升高,并同硬度结合可以推断海绵体动脉和静脉异常;海绵体动脉PSV、EDV、RI在不同硬度有显著性差异(P<0.05),RI与硬度密切相关(r's=0.7948,P<0.01),可作为阳萎分度诊断的客观指标.结论 多普勒超声是阳萎分度诊断有价值的检查手段.%Objective To studly the difference of penile vascular parameters under different penis stiffness state in order to provide objective information for diagnosis of impotence grading. Methods Seventy-four cases of impotence patients were examined by color Doppler flow imaging (CDFI). Before and after drug injection of cavemosum,the 5SV,EDV,RI of cavernosal artery and velocity of dorsal vein were measured continously at the time interval of 5 min,and were compared with penis stiffness state. The difference of the vascular parameters and the correlation between the vascular parameters and penis stiffness were analysed under different penis stiffness. Results By combinating the PSV decrease and EDV increase of cavernosal artery with penis stiffness, the abnormalities of cavernosal artery and dorsal vein may be found. Under different penis stiffness state the PSV, EDV,RI o"f cavernosal artery have significant difference ( P <0.05). The RI correlated closely with the penis stiffness state ( r',= 0.7948). RI may provide objective data for the diagnosis of impotence grading. Conclusions CDFI is regarded as the valuable method in the diagnosis of impotence grading.

  9. The monitoring value of color Doppler ultrasound in the vein puncture catheter postoperative application%彩色多普勒超声对静脉穿刺置管术后的监测价值

    Institute of Scientific and Technical Information of China (English)

    黄少敏; 岑忠耿; 张伟帅; 杨文海

    2016-01-01

    Objective To evaluate the value of color Doppler ultrasound in the vein puncture catheter postop-erative application. Methods A retrospective analysis of 211 cases of postoperative patients with venous puncture, color Doppler ultrasound catheter in intravascular position and direction, where there were no abnormal echo and blood flow in the venous lumen, walking in the direction of the line and filling. Results Of 211 cases, 158 cases of catheter and venous blood circulation unobstructed, no thrombosis. 53 cases and venous thrombosis, where incidence was 25%. Conclusion Color Doppler ultrasound is the preferred method of monitoring venous puncture catheter in postoperative patients.%目的:探讨彩色多普勒超声在静脉穿刺置管术后的应用价值。方法回顾性分析211例静脉穿刺置管术后患者,彩色多普勒超声观察导管在血管内位置及走行,所在静脉管腔内有无异常回声及血流的方向、走行及充盈情况。结果211例患者中,158例导管及所在静脉血流通畅,无血栓形成。53例导管及所在静脉有血栓形成,发生率为25%。结论彩色多普勒超声是监测静脉穿刺置管术后患者血管情况的首选方法。

  10. The clinical value of color Doppler ultrasound diagnosis of acute lower extremity deep venous thrombosis%彩色多普勒超声诊断下肢深静脉急性血栓的临床价值

    Institute of Scientific and Technical Information of China (English)

    雷声鸣; 童燕燕; 林继平

    2011-01-01

    Objective To evaluate the clinical value of color Doppler ultrasound in acute deep vein thrombosis diagnosis. Methods 38 patients acute deep venous thrombosis were treatment with color Doppler ultrasound then observed the, imaging features and the flow characteristics. Results The data in the diagnosis of acute thrombosis in 38 cases, 1 case of misdiagnosis, diagnosis rate of 97.44%, In which 37 patients with unilateral thrombosis, I case of thrombosis of both lower extremities; left lower extremity venous thrombosis in 27 cases, 10 cases of right lower limb thrombosis. Conclusion Color Doppler ultrasound examination for acute lower extremity deep venous thrombosis diagnosis has important clinical value, the preferred and reliable disease- based inspection methods.%目的 探讨彩色多普勒超声在下肢深静脉急性血栓诊断的价值.方法 应用彩色多普勒超声诊断39例下肢深静脉急性血栓,观察声像图特征及血流特点.结果 本组资料中诊断急性血栓38例,误诊1例,诊断符合率97.44%,其中单侧血栓37例,双下肢血栓1例;左下肢静脉血栓27例,右下肢血栓10例.结论 彩色多普勒超声检查对下肢深静脉急性血栓的诊断有重要的临床价值,为本病的首选和可靠的检查方法.

  11. 彩色多普勒超声在下肢深静脉血栓的诊断应用%Application of color Doppler ultrasound in diagnosis of lower extremity deep venous thrombosis

    Institute of Scientific and Technical Information of China (English)

    韩诚

    2014-01-01

    Objective:To evaluate the diagnosis significance of color Doppler ultrasound in deep lower vena thrombsis . Methods:35 cases patients with deep venous thrombosis were treated with color Doppler ultrasound then observed location, shape of thrombosis, diameter of affected vein, blood flow characteristics.Results:The data in the diagnosis of thrombosis in 35 cases,1 case of thrombosis of both lower extremities,34 case of thrombosis of single lower extremities;left lower extremity venous thrombosis in 24 cases,10 cases of right lower extremity venous throm-bosis.Conclusion:Color Doppler ultrasound examination for lower extremity deep venous thrombosis diagnosis has important clinical value,the preferred and reliable methods for lower extremity deep venous thrombosis .%目的:评价彩超对下肢深静脉血栓的诊断意义。方法:应用彩色多普勒超声诊断35例下肢深静脉血栓,观察血栓形成的位置、形态、受累静脉的管径、血流情况特点。结果:该组资料中诊断血栓35例,其中单侧血栓34例,双下肢血栓l例;左下肢静脉血栓24例,右下肢静脉血栓l0例。结论:彩色多普勒超声检查对下肢深静脉血栓的诊断有重要的临床价值,为该病的可靠和首选的检查方法。

  12. Comparison of diagnostic value of duplex and color Doppler ultrasound in experimental acute renal failure in rabbits%二维超声、频谱及彩色多普勒超声在评价实验性兔急性肾衰竭中的价值比较

    Institute of Scientific and Technical Information of China (English)

    黄晓玲; 高云华

    2000-01-01

    Objective To compare the diagnostic value of two-dimentional ultrasound, spectrum and color Doppler ultrasound in experimental acute renal failure(ARF)in rabbits.Methods 50%glycerin(12~15 ml/kg)were injected into the thigh muscle of the back leg of the rabbit to induce an animal model of ARF. Ultrasonic examination was performed on the day before(T0)and days 1,3…13 after the injection(T1,T3… T13).Renal size was evaluated by two-dimensional ultrasound.The hemodynamic changes of the kidney were quantitatively analysed by spectrum Doppler, while color Doppler flow imaging(CDFI)and color Doppler power imaging(CDPI)were used to qualitatively study the blood perfusion of the kidney during ARF. The renal imaging in CDFI and CDPI were classified three grades.Grade I, the blood perfusion of the kidney was normal and the flow singles could be seen at the site near to the renal capsule.Grade II, the blood perfusion of the kidney was slightly abnormal and the flow singles could be seen in the renal cortex but not near to the capsule. Grade Ⅲ, the blood perfusion was heavily abnormal and the flow singles could not be seen in the renal cortex.Results The changes of renal hemodynamics and renal size began at T3,peaked at T5 and T7,and returned to normal at T9. The renal imaging of all rabbits were grade I in CDPI and CDFI at T0.In CDFI, all were gradeⅢat T1~T9, at T11 and T13 most of them only returned to grade Ⅱ, no one returned to grade I.In CDPI, however, all were grade Ⅱ at T1 and T3,while only a few were grade Ⅲ at T5 and T7,and most have returned to grade Ⅰ at T9. Conclusions During the period of ARF, two-dimensional ultrasound is useful in showing the echo and measuring the depth of renal cortex.Spectrum Doppler is helpful in quantitatively analysing the renal hemodynamic hanges. CDPI is more sensitive than CDFI in showing the blood perfusion of the kidney%目的 比较二维超声、频谱及彩色多普勒超声在诊断

  13. 肝肿瘤灰阶超声造影与彩色多普勒超声检查对比分析%Comparison of Gray Scale Contrast-enhanced and Color Doppler Ultrasound in Diagnosis of Hepatic Tumor

    Institute of Scientific and Technical Information of China (English)

    李文彬; 匡驰; 胡丽娜; 唐水娟

    2012-01-01

    目的 对比灰阶超声造影和彩色多普勒超声在诊断肝肿瘤中的应用价值.资料与方法 34例肝肿瘤患者分别行灰阶超声造影及彩色多普勒超声造影,对血流显示率、微血管血流显示率行临床监测及综合调查分析.结果 灰阶超声造影及彩色多普勒造影血流显示率分别为100.0% (34/34)、91.2% (31/34),差异无统计学意义(x2=1.39,P>0.05);微血管血流显示率分别为97.1%(33/34)与29.4% (10/34),差异有统计学意义(x2=33.46,P<0.01).结论 实时灰阶超声造影法具有对低速血流敏感、对肿瘤微血管的显示敏感、空间分辨力较好、不存在伪像等优势,可用于观察肿瘤实质内的微血管灌注,较多普勒造影法更有助于鉴别诊断肝肿瘤.%Purpose To compare contrast enhanced ultrasonography and color Doppler ultrasound in evaluating patients with hepatic tumor. Materials and Methods 34 patients with hepatic tumor underwent contrast enhanced ultrasonography and color Doppler ultrasound examination. The clinical information was correlated with detection rate of blood flow and microvascular blood flow. Results Tumor blood flow was detected in 34 cases (100.0%) using contrast enhanced ultrasound and in 31 (91.2%) cases using color Doppler. There was no statistical significance (xr2=1.39, P > 0.05); contrast enhanced ultrasound demontrated microvascular blood flow in 33 cases (97.1%) significantly higer than color Doppler which showed microvascular blood flow in 10 patients (29.4%) (/=33.46, P < 0.01). Conclusion Real-time gray scale harmonic imaging method is sensitive in demonstrating slow flow, tumor microvessel with better spatial resolution and no artifacts. This can be utilized for real time observation of microvascular perfusion within the tumor.

  14. 高频彩色多普勒超声对小儿肠套叠的诊断价值%Diagnostic value of high frequency color Doppler ultrasound for pedo-intussusception

    Institute of Scientific and Technical Information of China (English)

    冼敏

    2010-01-01

    目的 探讨高频彩色多普勒超声对小儿肠套叠的诊断及其临床价值.方法 回顾性分析高频彩色多普勒超声诊断、并经X-线下空气灌肠复位和手术证实的小儿肠套叠120例.结果 120例小儿肠套叠,低频超声检出112例,检出率93.33%,高频彩色多普勒超声检出119例,漏诊1例,高频彩色多普勒超声检出率99.16%,11例超声提示肠坏死可能,手术后证实.结论 高频彩色多普勒超声对诊断小儿肠套叠的检出率高,彩色多普勒可间接提示肠套叠是否合并有肠坏死可能,为临床选择治疗方案提供依据,是目前临床早期诊断小儿肠套叠的首选检查方法.%Objective To approach the diagnosis and clinical value of high frequency color Doppler ultrasound for pedo-intussusception. Methods To analyze the 120 cases pedo-intussusception retrospective,which has been diagnosed by high frequency color Doppler ultrasound and been certified by gaseous enema reduction and operation. Results In the 120 cases pedo-intussusception, 112 cases were detected by low frequency ultrasound,the detection rate was 93.33%. 119 cases were detected by high frequency color Doppler ultrasound, 1 case was missed diagnosis, the detection rate was 99.16%, and 11 eases were prompted to be intestinal necrosis,which certified by operation. Conclusion The detection rate of high frequency color Doppler ultrasound is high for pedo-intussusception. It can prompt that intussusception combine ntestinal necrosis or not and offer evidence for selecting treatment protocols. It is the preferred check method for early diagnosis of pedo-intussusception.

  15. Value of color Doppler ultrasound in diagnosis of closed scrotal and testicular trauma%彩色多普勒超声对阴囊闭合性损伤的诊断价值

    Institute of Scientific and Technical Information of China (English)

    黄芳

    2011-01-01

    目的 探讨彩色多普勒超声对阴囊闭合性损伤的诊断价值.方法 回顾性分析32例阴囊外伤患者的彩色多普勒超声图像资料,检测阴囊壁层次结构和睾丸的形态大小,内部有无肿块;对病变区,测量其大小,观察其形态、边界及内部回声,并用彩色多普勒观察肿块内部及周边血流情况.结果 32例患者根据睾丸、阴囊的声像图表现可分为:睾丸挫伤5例,睾丸血肿10例,睾丸破裂16例,单纯阴囊壁血肿1例(另有10例阴囊壁血肿合并睾丸损伤).结论 高频彩色多普勒超声能准确诊断阴囊、睾丸的损伤,可作为阴囊闭合性损伤的首选检查方法.%Objective To explore the value of color Doppler ultrasound in diagnosis of scrotal and testicular trauma.Methods The color Doppler ultrasonic imaging data of 32 patients with closed scrotal and testicular trauma were analyzed retrospectively. The layers and structure of scrotum wall, shape and size of testicles, internal masses were detected. The size,shape , boundary and internal echo of lesions were observed, then the blood flow was observed by color Doppler ultrasonography.Results According to the ultrasonographic imaging, 32 cases were divided into 5 cases of testicular contusion, 10 cases of testicular hematoma, 16 cases of testicular rupture, 1 case of simple scrotal wall hematoma( another 10 cases of scrotal wall hematoma complicated with testicular injury ). Conclusion High frequency color Doppler ultrasonography can accurately diagnose scrotal and testicular trauma, it can be the best way for examining closed scrotal trauma.

  16. 彩色多普勒超声在下肢深静脉血栓诊断中的应用分析%Analysis on Color Doppler Ultrasound Application in Diagnosis of Deep Venous Thrombosis of Lower Extremity

    Institute of Scientific and Technical Information of China (English)

    高宏

    2015-01-01

    Objective To evaluate the efficacy of color doppler ultrasound application in diagnosis of deep venous thrombosis of lower extremity. Methods We chose 42 patients suffering from deep venous thrombosis of lower extremity who were treated in hospital from December 2013 to December 2014 and separated them into study group and control group at random. Patients in study group were given color doppler ultrasound examination; while patients in control group were diagnosed by DSA(digital subtraction angiography),and then compared diagnosis effect of two groups. Results Diagnosis accuracy and complication incidence in study group were much better than those in control group; there was a diagnosis differential between two groups,and such a differential had statistic value(P<0.05). Conclusion Color doppler ultrasound examination is accurate and efficiency in diagnosis of deep venous thrombosis of lower extremity; it is conducive to increasing diagnosis efficiency and reducing complication incidence,therefore,color doppler ultrasound examination is rather worthwhile to be promoted and applied in diagnosis of deep venous thrombosis.%目的:探讨彩色多普勒超声在下肢深静脉血栓诊断中的应用分析。方法选取2013年12月~2014年12月我院接诊的42例下肢深静脉血栓患者,随机分为实验组和对照组,实验组采用彩色多普勒超声诊断技术,对照组采用数字减影血管造影(DSA)诊断技术,观察两组患者的诊断效果。结果实验组患者的诊断准确率、并发症的发生率好于对照组,差异有统计学意义(P<0.05)。结论彩色多普勒超声在下肢深静脉血栓诊断中的效果显著,诊断率高,并发症的发生率低。

  17. Two-dimensional discrete gap breathers in a two-dimensional discrete diatomic Klein-Gordon lattice

    Institute of Scientific and Technical Information of China (English)

    XU Quan; QIANG Tian

    2009-01-01

    We study the existence and stability of two-dimensional discrete breathers in a two-dimensional discrete diatomic Klein-Gordon lattice consisting of alternating light and heavy atoms, with nearest-neighbor harmonic coupling.Localized solutions to the corresponding nonlinear differential equations with frequencies inside the gap of the linear wave spectrum, i.e. two-dimensional gap breathers, are investigated numerically. The numerical results of the corresponding algebraic equations demonstrate the possibility of the existence of two-dimensional gap breathers with three types of symmetries, i.e., symmetric, twin-antisymmetric and single-antisymmetric. Their stability depends on the nonlinear on-site potential (soft or hard), the interaction potential (attractive or repulsive)and the center of the two-dimensional gap breather (on a light or a heavy atom).

  18. Two Dimensional Hydrodynamic Analysis of the Moose Creek Floodway

    Science.gov (United States)

    2012-09-01

    ER D C/ CH L TR -1 2 -2 0 Two Dimensional Hydrodynamic Analysis of the Moose Creek Floodway C oa st al a n d H yd ra u lic s La b or at...distribution is unlimited. ERDC/CHL TR-12-20 September 2012 Two Dimensional Hydrodynamic Analysis of the Moose Creek Floodway Stephen H. Scott, Jeremy A...A two-dimensional Adaptive Hydraulics (AdH) hydrodynamic model was developed to simulate the Moose Creek Floodway. The Floodway is located

  19. RESEARCH ON TWO-DIMENSIONAL LDA FOR FACE RECOGNITION

    Institute of Scientific and Technical Information of China (English)

    Han Ke; Zhu Xiuchang

    2006-01-01

    The letter presents an improved two-dimensional linear discriminant analysis method for feature extraction. Compared with the current two-dimensional methods for feature extraction, the improved two-dimensional linear discriminant analysis method makes full use of not only the row and the column direction information of face images but also the discriminant information among different classes. The method is evaluated using the Nanjing University of Science and Technology (NUST) 603 face database and the Aleix Martinez and Robert Benavente (AR) face database. Experimental results show that the method in the letter is feasible and effective.

  20. ONE-DIMENSIONAL AND TWO-DIMENSIONAL LEADERSHIP STYLES

    Directory of Open Access Journals (Sweden)

    Nikola Stefanović

    2007-06-01

    Full Text Available In order to motivate their group members to perform certain tasks, leaders use different leadership styles. These styles are based on leaders' backgrounds, knowledge, values, experiences, and expectations. The one-dimensional styles, used by many world leaders, are autocratic and democratic styles. These styles lie on the two opposite sides of the leadership spectrum. In order to precisely define the leadership styles on the spectrum between the autocratic leadership style and the democratic leadership style, leadership theory researchers use two dimensional matrices. The two-dimensional matrices define leadership styles on the basis of different parameters. By using these parameters, one can identify two-dimensional styles.

  1. 彩色多普勒超声在妇科急腹症中应用价值%Application Value of Color Doppler Ultrasound in Gynecological Acute Abdomen

    Institute of Scientific and Technical Information of China (English)

    吴春山; 苏丹萍

    2013-01-01

    Objective:To explore ultrasound diagnosis value in gynecologic acute abdomen. Methods :The application of ultrasonic diagnosis for gynecological acute abdomen in 157 cases were confirmed by clinical operation. Results:color Dopper flow ima ultrasonic accuracy rate was 94%.Conclusion:Color Doppler ultrasonic diagnostic occupies an important position in the gynecological acute abdomen.%  目的:探讨彩色多普勒超声在妇科急腹症的诊断价值,方法:应用超声对157例妇科急腹症进行诊断并经临床治疗或手术证实;结果:彩色多普勒超声诊断正确率为94%。结论:彩色多普勒超声诊断在妇科急腹症中占重要地位。

  2. A study of two-dimensional magnetic polaron

    Institute of Scientific and Technical Information of China (English)

    LIU; Tao; ZHANG; Huaihong; FENG; Mang; WANG; Kelin

    2006-01-01

    By using the variational method and anneal simulation, we study in this paper the self-trapped magnetic polaron (STMP) in two-dimensional anti-ferromagnetic material and the bound magnetic polaron (BMP) in ferromagnetic material. Schwinger angular momentum theory is applied to changing the problem into a coupling problem of carriers and two types of Bosons. Our calculation shows that there are single-peak and multi-peak structures in the two-dimensional STMP. For the ferromagnetic material, the properties of the two-dimensional BMP are almost the same as that in one-dimensional case; but for the anti-ferromagnetic material, the two-dimensional STMP structure is much richer than the one-dimensional case.

  3. UPWIND DISCONTINUOUS GALERKIN METHODS FOR TWO DIMENSIONAL NEUTRON TRANSPORT EQUATIONS

    Institute of Scientific and Technical Information of China (English)

    袁光伟; 沈智军; 闫伟

    2003-01-01

    In this paper the upwind discontinuous Galerkin methods with triangle meshes for two dimensional neutron transport equations will be studied.The stability for both of the semi-discrete and full-discrete method will be proved.

  4. Two-Dimensionally-Modulated, Magnetic Structure of Neodymium Metal

    DEFF Research Database (Denmark)

    Lebech, Bente; Bak, P.

    1979-01-01

    The incipient magnetic order of dhcp Nd is described by a two-dimensional, incommensurably modulated structure ("triple-q" structure). The ordering is accompanied by a lattice distortion that forms a similar pattern....

  5. Entanglement Entropy for time dependent two dimensional holographic superconductor

    CERN Document Server

    Mazhari, N S; Myrzakulov, Kairat; Myrzakulov, R

    2016-01-01

    We studied entanglement entropy for a time dependent two dimensional holographic superconductor. We showed that the conserved charge of the system plays the role of the critical parameter to have condensation.

  6. Decoherence in a Landau Quantized Two Dimensional Electron Gas

    Directory of Open Access Journals (Sweden)

    McGill Stephen A.

    2013-03-01

    Full Text Available We have studied the dynamics of a high mobility two-dimensional electron gas as a function of temperature. The presence of satellite reflections in the sample and magnet can be modeled in the time-domain.

  7. Quantization of Two-Dimensional Gravity with Dynamical Torsion

    CERN Document Server

    Lavrov, P M

    1999-01-01

    We consider two-dimensional gravity with dynamical torsion in the Batalin - Vilkovisky and Batalin - Lavrov - Tyutin formalisms of gauge theories quantization as well as in the background field method.

  8. Spatiotemporal dissipative solitons in two-dimensional photonic lattices.

    Science.gov (United States)

    Mihalache, Dumitru; Mazilu, Dumitru; Lederer, Falk; Kivshar, Yuri S

    2008-11-01

    We analyze spatiotemporal dissipative solitons in two-dimensional photonic lattices in the presence of gain and loss. In the framework of the continuous-discrete cubic-quintic Ginzburg-Landau model, we demonstrate the existence of novel classes of two-dimensional spatiotemporal dissipative lattice solitons, which also include surface solitons located in the corners or at the edges of the truncated two-dimensional photonic lattice. We find the domains of existence and stability of such spatiotemporal dissipative solitons in the relevant parameter space, for both on-site and intersite lattice solitons. We show that the on-site solitons are stable in the whole domain of their existence, whereas most of the intersite solitons are unstable. We describe the scenarios of the instability-induced dynamics of dissipative solitons in two-dimensional lattices.

  9. Bound states of two-dimensional relativistic harmonic oscillators

    Institute of Scientific and Technical Information of China (English)

    Qiang Wen-Chao

    2004-01-01

    We give the exact normalized bound state wavefunctions and energy expressions of the Klein-Gordon and Dirac equations with equal scalar and vector harmonic oscillator potentials in the two-dimensional space.

  10. A two-dimensional polymer prepared by organic synthesis.

    Science.gov (United States)

    Kissel, Patrick; Erni, Rolf; Schweizer, W Bernd; Rossell, Marta D; King, Benjamin T; Bauer, Thomas; Götzinger, Stephan; Schlüter, A Dieter; Sakamoto, Junji

    2012-02-05

    Synthetic polymers are widely used materials, as attested by a production of more than 200 millions of tons per year, and are typically composed of linear repeat units. They may also be branched or irregularly crosslinked. Here, we introduce a two-dimensional polymer with internal periodicity composed of areal repeat units. This is an extension of Staudinger's polymerization concept (to form macromolecules by covalently linking repeat units together), but in two dimensions. A well-known example of such a two-dimensional polymer is graphene, but its thermolytic synthesis precludes molecular design on demand. Here, we have rationally synthesized an ordered, non-equilibrium two-dimensional polymer far beyond molecular dimensions. The procedure includes the crystallization of a specifically designed photoreactive monomer into a layered structure, a photo-polymerization step within the crystal and a solvent-induced delamination step that isolates individual two-dimensional polymers as free-standing, monolayered molecular sheets.

  11. Second invariant for two-dimensional classical super systems

    Indian Academy of Sciences (India)

    S C Mishra; Roshan Lal; Veena Mishra

    2003-10-01

    Construction of superpotentials for two-dimensional classical super systems (for ≥ 2) is carried out. Some interesting potentials have been studied in their super form and also their integrability.

  12. 彩色多普勒超声在早产儿视网膜病变中应用%Application of color Doppler flow imaging in retinopathy of prematurity

    Institute of Scientific and Technical Information of China (English)

    陈洁玲; 邹丽娟; 吴京红; 赵华飞; 吴中耀

    2011-01-01

    Objective To observe ultrasound characteristics in stage Ⅴ retinopathy of prematurity.Methods All 80 patients (150 eyes) with retinopathy of prematurity were examined with color Doppler flow imaging (CDFI). The morphologic characteristics of color Doppler flow imaging and blood stream were observed in patients with retinopathy of prematurity. Results Among 150 eyes with retinopathy of prernaturity at stage Ⅴ, there were 80 patients in whom we observed that lump-like echo connected closely with echo of lens and the circumambience was surrounded and the zonal echo was attached to the optic disc. The features of blood flow showed the signal of blood stream connected with central retinal vessels, which was analyzed by Doppler spectrum as the blood-flow spectrum like sand-heap. Conclusions The morphologic changes of color Doppler flow imaging and the features of blood flow are useful in diagnosis of retinopathy of prematurity patients at the stageⅤ.%目的 观察5期早产儿视网膜病变的超声显像特征.方法 用彩色多普勒超声诊断仪检查80例(150只眼)于眼科临床检查发现异常的早产患儿,并观察彩色多普勒血流成像(CDFI)形态特点及病变的血流特征.结果 在早产儿患眼超声检查80例(150只眼)眼内显示为与晶状体回声紧密相连并包绕其周围的不规则光团回声,光团与视乳头间条索状光带相连,血流特点表现为条索状光带上显示与视网膜中央血管相延续的血流信号,脉冲多普勒显示沙堆状动脉血流频谱特征.结论 彩色多普勒超声能清晰显示5期早产儿视网膜病变的超声显像特征和血流特征,结合临床病史,为诊断提供重要的依据.

  13. The diagnosic value of Color Doppler Ultrasound in placental abruption%彩色多普勒超声在胎盘早剥中的诊断价值

    Institute of Scientific and Technical Information of China (English)

    刘楠

    2013-01-01

    目的:探讨彩色多普勒超声在胎盘中的诊断价值。方法:回顾性分析对符合胎盘早剥症状表现的203例孕妇行超声检查,探查胎儿胎盘分布,厚度,内部结构。结果:203例超声诊断与产后胎盘外观所见符合胎盘早剥者32例。结论:彩色多普勒超声能早期诊断胎盘早剥,准确率高,为临床选择分娩方式提供可靠的图像依据,具有较好的临床实用价值。%Objective:Discuss the diagnosic of Color Doppler Ultrasound in placental abruption. Methods:examine 203 cases of pregnant woman whose symptom accord placental abruption,examine fetus’s placenta distributing,thickness ane the structure .Results:there are 32 cases accors placental abrubtion in the 203 cases of pregnant woman.Conclusion:color Doppler Ultrasound can.

  14. Clinical value of high frequency color doppler ultrasound in the diagnosis of scrotum emergencies%高频彩色多普勒超声在阴囊急症诊断中的临床价值

    Institute of Scientific and Technical Information of China (English)

    郭丽霞; 江艳丽

    2015-01-01

    目的:探讨高频彩色多普勒超声在阴囊急症诊断中的临床价值。方法:对41例阴囊急症患者的声像图表现进行回顾性分析。结果:睾丸及附睾炎性改变21例,睾丸蒂扭转9例,睾丸外伤7例,阴囊疝4例。结论:高频彩色多普勒超声对阴囊急症诊断有较高的临床价值,可作为诊断与鉴别阴囊急症的首选无创性临床检查方法。%Objective:To explore the clinical value of high frequency color doppler ultrasound in the diagnosis of scrotum emergencies.Methods:The ultrasonogram manifestations of 41 patients with scrotum emergencies were retrospectively analyzed. Results:21 cases were testis and epididymis inflammatory change.9 cases were testicular pedicle torsion.7 cases were testicular trauma.4 cases were scrotum hernia.Conclusion:High frequency color doppler ultrasound has a high clinical value in the diagnosis of scrotum emergencies.It can be used as the preferred noninvasive clinical examination method for diagnosis and identification of scrotum emergencies.

  15. Extreme paths in oriented two-dimensional percolation

    OpenAIRE

    Andjel, E. D.; Gray, L. F.

    2016-01-01

    International audience; A useful result about leftmost and rightmost paths in two dimensional bond percolation is proved. This result was introduced without proof in \\cite{G} in the context of the contact process in continuous time. As discussed here, it also holds for several related models, including the discrete time contact process and two dimensional site percolation. Among the consequences are a natural monotonicity in the probability of percolation between different sites and a somewha...

  16. Two Dimensional Nucleation Process by Monte Carlo Simulation

    OpenAIRE

    T., Irisawa; K., Matsumoto; Y., Arima; T., Kan; Computer Center, Gakushuin University; Department of Physics, Gakushuin University

    1997-01-01

    Two dimensional nucleation process on substrate is investigated by Monte Carlo simulation, and the critical nucleus size and its waiting time are measured with a high accuracy. In order to measure the critical nucleus with a high accuracy, we calculate the attachment and the detachment rate to the nucleus directly, and define the critical nucleus size when both rate are equal. Using the kinematical nucleation theory by Nishioka, it is found that, our obtained kinematical two dimensional criti...

  17. Controlled Interactions between Two Dimensional Layered Inorganic Nanosheets and Polymers

    Science.gov (United States)

    2016-06-15

    polymers . 2. Introduction . Research objectives: This research aims to study the physical (van der Waals forces: crystal epitaxy and π-π...AFRL-AFOSR-JP-TR-2016-0071 Controlled Interactions between Two Dimensional Layered Inorganic Nanosheets and Polymers Cheolmin Park YONSEI UNIVERSITY...Interactions between Two Dimensional Layered Inorganic Nanosheets and Polymers 5a.  CONTRACT NUMBER 5b.  GRANT NUMBER FA2386-14-1-4054 5c.  PROGRAM ELEMENT

  18. Two-Dimensional Weak Pseudomanifolds on Eight Vertices

    Indian Academy of Sciences (India)

    Basudeb Datta; Nandini Nilakantan

    2002-05-01

    We explicitly determine all the two-dimensional weak pseudomanifolds on 8 vertices. We prove that there are (up to isomorphism) exactly 95 such weak pseudomanifolds, 44 of which are combinatorial 2-manifolds. These 95 weak pseudomanifolds triangulate 16 topological spaces. As a consequence, we prove that there are exactly three 8-vertex two-dimensional orientable pseudomanifolds which allow degree three maps to the 4-vertex 2-sphere.

  19. Two-Dimensional Materials for Sensing: Graphene and Beyond

    Directory of Open Access Journals (Sweden)

    Seba Sara Varghese

    2015-09-01

    Full Text Available Two-dimensional materials have attracted great scientific attention due to their unusual and fascinating properties for use in electronics, spintronics, photovoltaics, medicine, composites, etc. Graphene, transition metal dichalcogenides such as MoS2, phosphorene, etc., which belong to the family of two-dimensional materials, have shown great promise for gas sensing applications due to their high surface-to-volume ratio, low noise and sensitivity of electronic properties to the changes in the surroundings. Two-dimensional nanostructured semiconducting metal oxide based gas sensors have also been recognized as successful gas detection devices. This review aims to provide the latest advancements in the field of gas sensors based on various two-dimensional materials with the main focus on sensor performance metrics such as sensitivity, specificity, detection limit, response time, and reversibility. Both experimental and theoretical studies on the gas sensing properties of graphene and other two-dimensional materials beyond graphene are also discussed. The article concludes with the current challenges and future prospects for two-dimensional materials in gas sensor applications.

  20. Comparative Study of Molybdenum Target Mammography and Color Doppler Ultrasound in Breast Cancer Diagnosis%乳腺X线钼靶与彩超在乳腺癌诊断中的价值比较

    Institute of Scientific and Technical Information of China (English)

    刘亚; 胡茂能; 余梁; 含笑; 曾敏

    2013-01-01

    目的:探讨乳腺X线钼靶摄片、彩色多普勒超声对于乳腺癌诊断的临床价值及限度。方法:回顾性分析55例经手术病理证实为乳腺癌的乳腺钼靶影像报告、彩色多普勒超声结果以及临床相关资料,并按照乳腺影像学报告和数据系统(BI-RADS)分级标准进行统计分析。结果:①钼靶与病理诊断符合率为65%,彩超与病理的诊断符合率为69%,两者间无显著差异(P>0.05),两者联合应用其诊断符合率为89%。②钼靶对于微小钙化的显示优于彩超,彩超对局部血管及血流异常的显示优于钼靶。结论:乳腺钼靶X线与超声在乳腺癌的诊断中各有优势及不足,联合应用可以提高其诊断准确率。%Objective:To investigate the clinical value and limitation of Molybdenum Target Mammography (breast X-ray radiography) and Color Doppler ultrasound in the diagnosis of breast cancer. Methods:Breast cancer data from 55 patients was collected in our hospital from october 2009 to December 2012. The mammography report and color Doppler ultrasound result of these cases, which were confirmed by surgery and pathological analysis for breast cancer, were analyzed retrospectively. Statistical analysis was done according to the breast Imaging and reporting System (BI-RADS) classification standard. Results: ①The coincidence rate between Molybdenum Target Mammography and pathological diagnosis is 65%;the rate between ultrasonography and pathological diagnosis is 69%. There is no signif-icant difference(P>0.05) between the above rates. The diagnostic rate with two joint applications is 89%.②The dis-play of Microcalcification by Molybdenum Target Mammography is better than Color Doppler Ultrasound; but Color Doppler Ultrasound is better than Molybdenum Target Mammography in detection of the abnormalities of local blood vessels and blood flow. Conclusion:Our results show that Molybdenum Target Mammography and Color Doppler Ul

  1. 彩色多普勒超声对下肢深静脉血栓形成的诊断价值%Application value of color Doppler ultrasound in diagnosing lower extremity deep venous thrombosis

    Institute of Scientific and Technical Information of China (English)

    靳静

    2016-01-01

    目的 探讨彩色多普勒超声对下肢深静脉血栓形成的诊断价值.方法 选取2011年3月至2015年11月河北省廊坊市人民医院行彩色多普勒超声检查的下肢深静脉血栓形成患者63例,结合患者临床表现,分析彩色多普勒超声检查结果.结果 63例下肢深静脉血栓形成患者经彩色多普勒超声检查,左下肢40例(63.5%),右下肢20例(31.7%),双下肢2例(3.2%),漏诊1例(1.6%),诊断率为98.4%(62/63).62例确诊患者中急性栓塞14例(22.2%),亚急性栓塞40例(63.5%),慢性栓塞8例(12.7%).结论 应用彩色多普勒超声对下肢深静脉血栓高危患者进行检查,无创安全、及时准确、可重复操作且经济便捷,为临床提供可靠的诊断依据,是诊断下肢深静脉血栓形成的首选辅助检查方法.%Objective To explore the value of color Doppler ultrasound in diagnosing lower extremity deep venous thrombosis.Methods Sixty-three cases with lower extremity deep venous thrombosis who underwent color Doppler ultrasound from March 2011 to November 2015 were enrolled.The results of color Doppler ultrasound were analyzed based on clinical data.Results Totally 40 cases (63.5%) of left lower limb,20 cases (31.7%) of right lower limb and 2 cases (3.2%) of bilateral lower limb deep venous thrombosis were diagnosed by color Doppler ultrasound,1 case (1.6%) was missed,with diagnostic rate of 98.4% (62/63);among the 62 patients,14 cases (22.2%) were confirmed as acute lower extremity deep venous thrombosis,40 cases (63.5%) were confirmed as subacute lower extremity deep venous thrombosis and 8 cases (12.7%) were confirmed as chronic lower extremity deep venous thrombosis.Conclusion Color doppler ultrasound is non-invasive,safe,timely,accurate,repeatable,inexpensive and convenient,and is a preferred method for diagnosing lower extremity deep venous thrombosis.

  2. Clinical Value of Color Doppler Ultrasound in Diagnosis of Accessory Breast%彩超诊断副乳腺的临床价值分析

    Institute of Scientific and Technical Information of China (English)

    田涛

    2015-01-01

    目的:探讨彩色多普勒超声对副乳腺的诊断价值,以便为临床诊治和随访提供可靠的影像学依据。方法选取2008年4月~2012年8月在我院经高频超声及临床诊治的21例副乳患者,回顾性分析超声声像图特征,并鉴别诊断。结果副乳就是多余的乳房,一般发生在腋前区或腋下,也可见于胸壁、腹部等。副乳大多成对出现,对称分布,一般都比正常乳房要小,平常期的副乳实质回声一般略低于正常乳腺组织或强弱相间,高于脂肪组织,边界不整齐,无包膜,乳腺小叶结构不完整,实质内大多无明显的血流分布,与正常乳腺有明显分界,可发生小叶增生、导管扩张、纤维腺瘤、副乳癌等。结论高频超声是诊断副乳腺病变最为实用和有效的检查手段,且适用于哺乳期妇女,便于临床诊治和随访。%Objective To investigate the diagnostic value of color Doppler ultrasound in the diagnosis and treatment of accessory breast in order to provide reliable imaging evidence for clinical diagnosis and follow-up. Methods 21 cases of high frequency ultrasound and clinical diagnosis and treatment of the two patients were selected in our hospital in April 2008~August 2012, retrospective analysis of the ultrasonographic features and differential diagnosis. Results Accessory breast generally occurs in the anterior axillary region or axillary, are also found in the chest, abdomen etc. accessory breast mostly appear in pairs, symmetrical distribution, generally than normal breast to small, usual accessory breast parenchyma echo generally slightly lower than normal breast tissue or strength of the interphase, higher than the adipose tissue, irregular borders, no capsule, breast lobular structure is not complete, parenchyma mostly without obvious blood flow distribution, a clear demarcation with normal breast, can occur as a result of lobular hyperplasia, duct dilatation

  3. The effect of isometric exercise of the hand on the synovial blood flow in patients with rheumatoid arthritis measured by color Doppler ultrasound

    DEFF Research Database (Denmark)

    Ellegaard, Karen; Torp-Pedersen, Søren; Lund, Hans

    2013-01-01

    In 90% of patients with rheumatoid arthritis (RA), the joints of the hand are affected. Studies of grip strength training have not indicated a negative effect on disease activity after training. Introduction of ultrasound Doppler (USD) to measure increased blood flow induced by inflammation has...

  4. A comparison of cell-free placental messenger ribonucleic acid and color Doppler ultrasound for the prediction of placental invasion in patients with placenta accreta

    Directory of Open Access Journals (Sweden)

    Elham Naghshineh

    2015-01-01

    Conclusions: Cell-free mRNA is an acceptable, easy made, functional test with sensitivity, specificity, PPV and NPV more than Doppler ultrasound for diagnosis and prediction of incidence of placenta accrete and we recommend the use of cell-free mRNA test for diagnosis of placenta accreta.

  5. Clinical Analysis of Color Doppler Ultrasound and X-ray Mammography in Screening Female Breast Cancer%彩超与X线钼靶筛查妇女乳腺癌临床分析

    Institute of Scientific and Technical Information of China (English)

    冯庆菁; 骆有寿; 徐惊; 黄晓芸; 朱超群; 周广慧

    2016-01-01

    Objective To discuss the effect of color Doppler ultrasound and x-ray mammography in screening female breast cancer. Methods 118 cases of patients with breast cancer diagnosed in our hospital from October 2012 to October 2015 were selected and screened and diagnosed with color Doppler ultrasound and X-ray mammography, and the diagnostic re-sults of them were compared. Results The coincident rate and detection rate of blood flow signal of color ultrasonic diagno-sis were obviously higher than those of x-ray mammography diagnosis, and the differences were obvious(P<0.05), the calci-fication detection rate of x-ray mammography was higher than that of the color Doppler ultrasound, and the difference was obvious(P<0.01), the coincident rate of pathological report and color ultrasonic diagnosis was 93.22%(110/118), the coinci-dent rate of X-ray mammography diagnosis was 79.66%(94/118), and the sensitivity, specificity, missed detection rate and misdiagnosis rate were respectively 93.55%, 97.70%, 6.45% and 2.30%. Conclusion Both color Doppler ultrasound and x-ray mammography in diagnosis of breast cancer are effective diagnostic methods, and each has its advantages and disadvan-tages, which can be selected according to the specific conditions of patients.%目的:探究彩超与X线钼靶对妇女乳腺癌的筛查效果。方法整群选择该院2012年10月—2015年10月确诊的118例乳腺癌患者,对其采用彩超和X线钼靶进行筛查诊断,对比两者诊断结果。结果彩超诊断符合率、血流信号检出率显著高于X线钼靶诊断,差异有统计学意义(P<0.05);X线钼靶的钙化检出率高于彩超,差异有统计学意义(P<0.01)。彩超诊断病理报告符合率为93.22%(110/118),X线钼靶诊断符合率为79.66%(94/118),彩超检查的灵敏度为93.55%,特异度为97.70%,漏检率为6.45%,误诊率为2.30%。结论彩超与X线钼靶诊断乳腺癌均为有效诊断方式,且各有利弊,可根据患者具体情况选择。

  6. The use of virtual reality to reimagine two-dimensional representations of three-dimensional spaces

    Science.gov (United States)

    Fath, Elaine

    2015-03-01

    A familiar realm in the world of two-dimensional art is the craft of taking a flat canvas and creating, through color, size, and perspective, the illusion of a three-dimensional space. Using well-explored tricks of logic and sight, impossible landscapes such as those by surrealists de Chirico or Salvador Dalí seem to be windows into new and incredible spaces which appear to be simultaneously feasible and utterly nonsensical. As real-time 3D imaging becomes increasingly prevalent as an artistic medium, this process takes on an additional layer of depth: no longer is two-dimensional space restricted to strategies of light, color, line and geometry to create the impression of a three-dimensional space. A digital interactive environment is a space laid out in three dimensions, allowing the user to explore impossible environments in a way that feels very real. In this project, surrealist two-dimensional art was researched and reimagined: what would stepping into a de Chirico or a Magritte look and feel like, if the depth and distance created by light and geometry were not simply single-perspective illusions, but fully formed and explorable spaces? 3D environment-building software is allowing us to step into these impossible spaces in ways that 2D representations leave us yearning for. This art project explores what we gain--and what gets left behind--when these impossible spaces become doors, rather than windows. Using sketching, Maya 3D rendering software, and the Unity Engine, surrealist art was reimagined as a fully navigable real-time digital environment. The surrealist movement and its key artists were researched for their use of color, geometry, texture, and space and how these elements contributed to their work as a whole, which often conveys feelings of unexpectedness or uneasiness. The end goal was to preserve these feelings while allowing the viewer to actively engage with the space.

  7. The Evaluation of Diagnoses and Management in Cesarean Scar Pregnancy with Color Doppler Ultrasound%彩色超声在子宫疤痕妊娠诊治中的作用

    Institute of Scientific and Technical Information of China (English)

    张小英; 彭艳丽; 陈涛; 朱亚利; 魏金铭; 王燕; 贾娟

    2011-01-01

    目的 评价彩色超声在疤痕妊娠诊治中的作用.方法 使用经阴道超声诊断疤痕妊娠病例进行保留生育能力的保守治疗.记录子宫疤痕孕囊时间、超声结果、β-hCG、经阴道彩色超声血流情况和手术方式及经腹超声在术中监测情况.结果 孕囊诊断时间约6周左右,剖腹产时间至疤痕妊娠时间为9 - 126月.经阴道超声诊断疤痕妊娠如下:孕囊大小0.8cm×0.4cm×0.5cm至2.2cm×2.1cm×1.0cm,有胎心,头臀径0.3cm至0.7cm,前壁肌层厚度0.5cm,血流显像丰富.对患者进行如下处理:子宫动脉栓塞后24小时在超声监测下行官腔镜吸官人流术2例,子官动脉栓塞失败+系统MTX化疗,经阴道超声检查孕囊仍存活,患者自动出院,后随访得知官腔镜下行吸官人流术,证实疤痕妊娠1例.结论 经阴道超声是子宫疤痕妊娠早期诊断非常有用手段,在经腹超声术中监测,明显缩短手术时间,减少盲目性,保证了手术安全.%Objecive To evaluate our experience and diagnosis of cesarean scar pregnancy(CSP) with color doppler ultrasound. Msthods From March 2006 to June 2010, 3 cases of cesarean scar pregnancy were diagnosed using color doppler sonography and treated conservatively to preserve fertility. Gastational age, sonographic findings, /3-human chorionic gonadotropin(/3-hCG) levels, flow profiles of transvaginal color Doppler ultrasound, and trasabdominal sonography during treatment were recorded. Results The gastational sac(GS) ages were diagnosed for about 6 weeks. The time interval from the Cesarean section to the diagnosis of Cesarean scar pregnancy was from 9 months to 126 months. Embryonic period diagnosed by color doppler sonography were as follow: the sizes of GS ranged from 0.8cm X 0.4cmx0.5cm to 2.2cm X2.1cmxl. 0cm, all with cardiac activity, the crown-rump length ranged from 0.3cm to 0.7cm, the anterior myometrial thickness to the csp were measured 0.5cm with rich color flow show. The patients were

  8. Tracking dynamics of two-dimensional continuous attractor neural networks

    Science.gov (United States)

    Fung, C. C. Alan; Wong, K. Y. Michael; Wu, Si

    2009-12-01

    We introduce an analytically solvable model of two-dimensional continuous attractor neural networks (CANNs). The synaptic input and the neuronal response form Gaussian bumps in the absence of external stimuli, and enable the network to track external stimuli by its translational displacement in the two-dimensional space. Basis functions of the two-dimensional quantum harmonic oscillator in polar coordinates are introduced to describe the distortion modes of the Gaussian bump. The perturbative method is applied to analyze its dynamics. Testing the method by considering the network behavior when the external stimulus abruptly changes its position, we obtain results of the reaction time and the amplitudes of various distortion modes, with excellent agreement with simulation results.

  9. Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

    Science.gov (United States)

    Wang, Qing Hua; Kalantar-Zadeh, Kourosh; Kis, Andras; Coleman, Jonathan N; Strano, Michael S

    2012-11-01

    The remarkable properties of graphene have renewed interest in inorganic, two-dimensional materials with unique electronic and optical attributes. Transition metal dichalcogenides (TMDCs) are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into two-dimensional layers of single unit cell thickness. Although TMDCs have been studied for decades, recent advances in nanoscale materials characterization and device fabrication have opened up new opportunities for two-dimensional layers of thin TMDCs in nanoelectronics and optoelectronics. TMDCs such as MoS(2), MoSe(2), WS(2) and WSe(2) have sizable bandgaps that change from indirect to direct in single layers, allowing applications such as transistors, photodetectors and electroluminescent devices. We review the historical development of TMDCs, methods for preparing atomically thin layers, their electronic and optical properties, and prospects for future advances in electronics and optoelectronics.

  10. Hamiltonian formalism of two-dimensional Vlasov kinetic equation.

    Science.gov (United States)

    Pavlov, Maxim V

    2014-12-08

    In this paper, the two-dimensional Benney system describing long wave propagation of a finite depth fluid motion and the multi-dimensional Russo-Smereka kinetic equation describing a bubbly flow are considered. The Hamiltonian approach established by J. Gibbons for the one-dimensional Vlasov kinetic equation is extended to a multi-dimensional case. A local Hamiltonian structure associated with the hydrodynamic lattice of moments derived by D. J. Benney is constructed. A relationship between this hydrodynamic lattice of moments and the two-dimensional Vlasov kinetic equation is found. In the two-dimensional case, a Hamiltonian hydrodynamic lattice for the Russo-Smereka kinetic model is constructed. Simple hydrodynamic reductions are presented.

  11. Control Operator for the Two-Dimensional Energized Wave Equation

    Directory of Open Access Journals (Sweden)

    Sunday Augustus REJU

    2006-07-01

    Full Text Available This paper studies the analytical model for the construction of the two-dimensional Energized wave equation. The control operator is given in term of space and time t independent variables. The integral quadratic objective cost functional is subject to the constraint of two-dimensional Energized diffusion, Heat and a source. The operator that shall be obtained extends the Conjugate Gradient method (ECGM as developed by Hestenes et al (1952, [1]. The new operator enables the computation of the penalty cost, optimal controls and state trajectories of the two-dimensional energized wave equation when apply to the Conjugate Gradient methods in (Waziri & Reju, LEJPT & LJS, Issues 9, 2006, [2-4] to appear in this series.

  12. Two-Dimensional Electronic Spectroscopy Using Incoherent Light: Theoretical Analysis

    CERN Document Server

    Turner, Daniel B; Sutor, Erika J; Hendrickson, Rebecca A; Gealy, M W; Ulness, Darin J

    2012-01-01

    Electronic energy transfer in photosynthesis occurs over a range of time scales and under a variety of intermolecular coupling conditions. Recent work has shown that electronic coupling between chromophores can lead to coherent oscillations in two-dimensional electronic spectroscopy measurements of pigment-protein complexes measured with femtosecond laser pulses. A persistent issue in the field is to reconcile the results of measurements performed using femtosecond laser pulses with physiological illumination conditions. Noisy-light spectroscopy can begin to address this question. In this work we present the theoretical analysis of incoherent two-dimensional electronic spectroscopy, I(4) 2D ES. Simulations reveal diagonal peaks, cross peaks, and coherent oscillations similar to those observed in femtosecond two-dimensional electronic spectroscopy experiments. The results also expose fundamental differences between the femtosecond-pulse and noisy-light techniques; the differences lead to new challenges and opp...

  13. A two-dimensional spin liquid in quantum kagome ice.

    Science.gov (United States)

    Carrasquilla, Juan; Hao, Zhihao; Melko, Roger G

    2015-06-22

    Actively sought since the turn of the century, two-dimensional quantum spin liquids (QSLs) are exotic phases of matter where magnetic moments remain disordered even at zero temperature. Despite ongoing searches, QSLs remain elusive, due to a lack of concrete knowledge of the microscopic mechanisms that inhibit magnetic order in materials. Here we study a model for a broad class of frustrated magnetic rare-earth pyrochlore materials called quantum spin ices. When subject to an external magnetic field along the [111] crystallographic direction, the resulting interactions contain a mix of geometric frustration and quantum fluctuations in decoupled two-dimensional kagome planes. Using quantum Monte Carlo simulations, we identify a set of interactions sufficient to promote a groundstate with no magnetic long-range order, and a gap to excitations, consistent with a Z2 spin liquid phase. This suggests an experimental procedure to search for two-dimensional QSLs within a class of pyrochlore quantum spin ice materials.

  14. Spectral Radiative Properties of Two-Dimensional Rough Surfaces

    Science.gov (United States)

    Xuan, Yimin; Han, Yuge; Zhou, Yue

    2012-12-01

    Spectral radiative properties of two-dimensional rough surfaces are important for both academic research and practical applications. Besides material properties, surface structures have impact on the spectral radiative properties of rough surfaces. Based on the finite difference time domain algorithm, this paper studies the spectral energy propagation process on a two-dimensional rough surface and analyzes the effect of different factors such as the surface structure, angle, and polarization state of the incident wave on the spectral radiative properties of the two-dimensional rough surface. To quantitatively investigate the spatial distribution of energy reflected from the rough surface, the concept of the bidirectional reflectance distribution function is introduced. Correlation analysis between the reflectance and different impact factors is conducted to evaluate the influence degree. Comparison between the theoretical and experimental data is given to elucidate the accuracy of the computational code. This study is beneficial to optimizing the surface structures of optoelectronic devices such as solar cells.

  15. Two dimensional convolute integers for machine vision and image recognition

    Science.gov (United States)

    Edwards, Thomas R.

    1988-01-01

    Machine vision and image recognition require sophisticated image processing prior to the application of Artificial Intelligence. Two Dimensional Convolute Integer Technology is an innovative mathematical approach for addressing machine vision and image recognition. This new technology generates a family of digital operators for addressing optical images and related two dimensional data sets. The operators are regression generated, integer valued, zero phase shifting, convoluting, frequency sensitive, two dimensional low pass, high pass and band pass filters that are mathematically equivalent to surface fitted partial derivatives. These operators are applied non-recursively either as classical convolutions (replacement point values), interstitial point generators (bandwidth broadening or resolution enhancement), or as missing value calculators (compensation for dead array element values). These operators show frequency sensitive feature selection scale invariant properties. Such tasks as boundary/edge enhancement and noise or small size pixel disturbance removal can readily be accomplished. For feature selection tight band pass operators are essential. Results from test cases are given.

  16. Optical modulators with two-dimensional layered materials

    CERN Document Server

    Sun, Zhipei; Wang, Feng

    2016-01-01

    Light modulation is an essential operation in photonics and optoelectronics. With existing and emerging technologies increasingly demanding compact, efficient, fast and broadband optical modulators, high-performance light modulation solutions are becoming indispensable. The recent realization that two-dimensional layered materials could modulate light with superior performance has prompted intense research and significant advances, paving the way for realistic applications. In this review, we cover the state-of-the-art of optical modulators based on two-dimensional layered materials including graphene, transition metal dichalcogenides and black phosphorus. We discuss recent advances employing hybrid structures, such as two-dimensional heterostructures, plasmonic structures, and silicon/fibre integrated structures. We also take a look at future perspectives and discuss the potential of yet relatively unexplored mechanisms such as magneto-optic and acousto-optic modulation.

  17. 产前应用彩色多普勒超声诊断胎儿心脏畸形的临床价值%Clinical value of color Doppler ultrasound in diagnosis of fetal cardiac malformations

    Institute of Scientific and Technical Information of China (English)

    丁宏军

    2015-01-01

    Objective To study the clinical value of color Doppler ultrasound in the diagnosis of fetal cardiac malformations. Methods From our hospital 176 cases (69 cases of maternal heart disease) in pregnant women as the research object, the fetuses of color doppler ultrasound,Analysis of ultrasound images and compare postnatal pathological results.Results Two checking methods of coincidence rate was 84.62%, the difference was not statistically significance (P > 0.05). And the mother has a history of heart disease, fetal heart disease 13.04%; The mother has no history of heart disease, fetal heart disease 1.87%.Conclusion Pregnant women have a history of heart disease especially pay attention to the growth of fetus during pregnancy, and color doppler ultrasonography can diagnose cardiac malformation fetus,and the diagnosis rate is high, no obvious adverse reactions, so the method is worthy of clinical application and promotion.%目的::研究产前应用彩色多普勒超声诊断胎儿心脏畸形的临床价值。方法:选取我院176例(其中69例母体有心脏病史)中孕期的妇女作为研究对象,对腹中的胎儿进行彩色多普勒超声检查,检查胎儿心脏情况,分析超声图像并对比产后胎儿的病理检查结果。结果:两种检查方法的符合率为84.62%,差异没有统计学意义(P>0.05)。且母体有心脏病史,胎儿有心脏病的比例为13.04%;母体没有心脏病史,胎儿有心脏病的比例为1.87%。结论:孕妇有心脏病史时在怀孕期间尤其注意胎儿的发育情况,另外彩色多普勒超声可以诊断胎儿心脏畸形,且诊断率高,无明显不良反应,因此该方法是值得临床上应用以及推广的。

  18. 高频彩超对下肢深静脉血栓的诊断研究%High frequency color Doppler ultrasound to research on the diagnosis of lower extremity deep vein thrombosis

    Institute of Scientific and Technical Information of China (English)

    王晓燕

    2015-01-01

    Objective: to investigate the diagnostic value of high frequency color doppler ultrasound in deep venous thrombosis of lower extremity. Methods:176 patients with lower extremity edema in our hospital from January 2013 to January were selected, and all patients were examined with color doppler ultrasound and the diagnostic results were analyzed.Results: 176 patients with deep venous thrombosis in the lower extremity in 62 patients, including 40 patients with left lesion, 14 patients with right side lesions, 8 patients with bilateral lesions. acute lower extremity deep venous thrombosis in 42 patients, 20 patients with chronic lower extremity venous thrombosis. thrombus in the anterior tibial veins, posterior tibial vein and calf muscular venous plexus were 19 cases, femoral vein and popliteal vein thrombus in a 43 cases. Conclusion: high frequency color doppler ultrasound in the diagnosis of lower extremity deep venous thrombosis with high sensitivity, is a noninvasive method for the diagnosis of lower limb venous thrombosis, which provides an important basis for clinical treatment.%目的:探讨高频彩超对下肢深静脉血栓的诊断意义。方法:选取2013年1月-2015年1月我院收治的下肢水肿患者176例,所有患者采取彩超高分辨率探头检查,分析其诊断结果。结果:176例患者中下肢深静脉血栓患者62例,其中左侧病变患者40例,右侧病变患者14例,双侧病变患者8例。急性下肢深静脉血栓患者42例,慢性下肢静脉血栓患者20例。血栓部位位于胫前静脉、胫后静脉以及小腿肌间静脉丛的患者19例,血栓部位位于股静脉、腘静脉的有43例。结论:高频彩超诊断下肢深静脉血栓具有较高的敏感性,是诊断下肢静脉血栓形成的一种无创方法,为临床治疗提供重要的依据。

  19. Color doppler blood flow imaging in twin reversed arterial perfusion sequence%彩色多普勒超声诊断双胎反向动脉灌注序列征

    Institute of Scientific and Technical Information of China (English)

    李雪蕾; 李昌安; 穆仲平

    2012-01-01

    目的探讨彩色多普勒超声诊断双胎反向动脉灌注序列征的价值.方法对5例双胎反向动脉灌注序列征的产前彩色多普勒超声检查结果进行回顾性分析,并与产后结果对照,总结声像图表现及诊断要点.结果 5例于产前彩色多普勒超声检查中发现并于产后证实为双胎反向动脉灌注序列征;5例均为单绒毛膜双胎,其中3例为单羊膜囊,2例为双羊膜囊;5例均为无脑、无心畸胎.结论彩色多普勒超声检查可以准确并及早诊断双胎反向动脉灌注序列征,有助于指导临床实现优生优育.%Objective To detect the diagnostic value of color doppler blood flow imaging in twin reversed arterial perfusion sequence. Methods Review and analysis of 5 cases of twin reversed arterial perfusion sequence were examined by color Doppler, and compared with the results of the clinical diagnosis after delivery. The main points of diagnosis were summarized. Results The twin reversed arterial perfusion sequence was observed in prenatal examination and demonstrated in postpartum through prenatal ultrasonic inspection system of 5 inspection objects. All 5 cases were confirmed to monochorionic twin. Among them 3 cases were monoamnionic twin and 2 cases were diamnionic twin. All 5 cases were anencephalia and acardia. Conclusion Color doppler imaging can provide accurate diagnoses with twin reversed arterial perfusion sequence timely, and will offer available instructions on clinical therapy to achieve prenatal and postnatal care.

  20. The screening value in the first-trimester fetuses by color Doppler flow image%彩色多普勒超声应用于11~14周胎儿筛查的价值

    Institute of Scientific and Technical Information of China (English)

    王莉; 吴青青; 陈焰; 姚苓; 马玉庆; 杨文娟; 李晓菲

    2011-01-01

    Objective To examine the value of color Doppler flow image CDFI)in the screening of first-trimester fetus. Methods Two thousand and three hundred and eighty cases in first-trimester were screened by the color Doppler ultrasonography. Results A total of 2426 fetuses included 46 twins. Twenty-eight fetuses were abnormal including 8 cases of NT≥3. 0 mm and 11cases of NT≥3. 0 mm with the other abnormalities. Eight cases of abnormal anatomical structures included 1 case of multiplicitas, 1 case of cephalocele, 1 case of partial hydatidiform mole, 1 case of choroid plexus cysts ,4 case of central nerve system abnormalities( 3 cases of exencephaly ,1 case of anencephaly )and 1 case of reversal "A" wave in ductus venosus flow.Conclusion The Color Doppler ultrasonographic examination can provide the important hereditary information for prenatal screening of first-trimester fetus and screen fetal serious abnormal anatomical structures.%目的 探讨彩色多普勒超声用于11~14周胎儿筛查的价值.方法 应用彩色多普勒超声对2380例孕11~14周(胎儿头臀长在45~84 mm之间)的孕妇进行检查.结果 胎儿总数2426例,其中单胎2334例,双胎46例.共发现可疑异常胎儿28例:(1)颈项透明层(NT)≥3.0 mm 8例.(2)NT≥3.0 mm合并其他异常11例.(3)胎儿单纯解剖结构异常8例(1例多发畸形,1例脐膨出,1例胎盘部分性葡萄胎,1例脉络丛囊肿,4例中枢神经系统畸形包括露脑畸形3例、无脑儿1例).(4)静脉导管血流频谱异常1例.结论 彩色多普勒超声检查用于11~14周胎儿筛查能够提供重要的遗传学信息,发现严重的胎儿解剖结构异常.

  1. Application of color Doppler ultrasound for diagnosing lower extremity venous vascular diseases%彩超在诊断下肢静脉血管疾病中的应用

    Institute of Scientific and Technical Information of China (English)

    舒银敏

    2015-01-01

    目的 分析研究彩超在下肢静脉血管疾病诊断中的应用价值.方法 选取我院收治的120例下肢静脉疾病患者,采用回顾性分析法,对彩超在患者下肢静脉疾病诊断中的应用以及诊断结果进行分析研究.结果 120例下肢静脉疾病患者中,108例患者的检查诊断结果为阳性,其中静脉血栓患者76例,静脉瓣功能不全患者23例,其他静脉疾病患者9例.结论 彩超在进行下肢静脉血管疾病诊断中不仅具有简便、迅速与安全的特征优势,并且进行患者病症检查诊断的客观性比较突出,值得在临床中进行推广应用.%Objective:analyze and research application value of color Doppler ultrasound for diagnosing lower extremity venous vascular diseases.Methos:choose 120 cases patients with lower extremity venous vascular diseases received in our hospital, and review and analyze application of color Doppler ultrasound for diagnosing lower extremity venous vascular diseases and its diagnosing effects.Result:108 cases of 120 patients with lower extremity venous vascular diseases showed positive after examination and diagnosis, and 76 cases are Venous thrombosis, 23 cases Venous valve insufficiency, 9 cases other venous diseases.Conclusion:during diagnosis for lower extremity venous vascular diseases color Doppler ultrasound has advantages and features of being simple, rapid and safe, and has objectivity during diagnosis, which is worth of being spreaded clinically.

  2. 彩色多普勒超声对小腿三头肌内静脉扩张的诊断价值%Diagnosis value of color Doppler ultrasonography phlebectasia in triceps surae

    Institute of Scientific and Technical Information of China (English)

    柳展梅; 鄂占森; 吕海霞; 张颖; 陈峥; 赵新宇

    2012-01-01

    Objective To investigate diagnosis value of color Doppler ultrasonography phlebectasia in triceps surae. Methods A total of 72 patients with inspected veins in triceps were enrolled,male 32,female 40,aged 28 - 92 years old,mean age 56 years old. The color Doppler ultrasonography was performed to inspect veins in triceps muscle(included soleus and gastrocnemius vein) and measured the diameters. The endovascular sound transmission and blood flow were observed and inspected the perforating veins. Results A total of 72 cases of the veins in triceps muscle were checked out,32 cases (44.4 %) of simple triceps surae phlebectasia,16 cases of combined thrombosis,24 cases of combined communicating branch phlebectasia. Conclusion It is demonstrated that the color Doppler ultrasound could be effective in detection phlebectasia in triceps surae,thrombosis and perforating veins ,it is an crucial content of ultrasound examination for deep veins.%目的 探讨彩色多普勒超声对小腿三头肌内静脉扩张的诊断价值.方法 选择72例疑为下肢深静脉病变的患者,其中男性32例,女性40例;年龄28~ 92岁,平均年龄56岁.应用彩色多普勒超声检查小腿三头肌内静脉(包括比目鱼肌静脉及腓肠肌静脉),测量其管径,观察管腔内透声及血流情况,探查其交通支的情况.结果 共检出小腿三头肌内静脉受累患肢72条,单纯小腿三头肌内静脉扩张32例(44.4%),合并血栓16例(22.2%),合并交通静脉扩张24例(33.3%).结论 彩色多普勒超声能够有效地检出小腿三头肌内静脉扩张及血栓、其交通支情况,是超声检查下肢深静脉时不容忽视的重要内容.

  3. 彩色多普勒超声检查乳腺肿块20例分析%Analysis of 20 cases with breast disease examined by Color Doppler Flowing Imaging

    Institute of Scientific and Technical Information of China (English)

    黄冬梅; 邹成银

    2014-01-01

    Objective To analyze the clinical diagnosis value of Color Doppler Flowing Imaging in the diag-nosis of female breast mass ,discuss sonographic features of breast hyperplasia and maeexy dyeplesle .Methods The data of 20 patients with breast disease which diagnosed by Color Doppler Flowing Imaging were retrospectively ana -lyzed,some cases were conducted postoperative pathological examination .Results In all cases,13 cases were breast fibroadenoma(65.0%),6 cases were maeexy dyeplesle (30.0%),1 case was metaplastic squamous cell carcinoma (5.0%).The typical fibroadenoma had regular shape ,clear boundary and homogeneous internal echo ,and were mar-ginated smoothly with a fine echoic capsule and a lateral wall shadowing .Conclusion Color Doppler ultrasonography is an approach for noninvasive and simple examination of breast lesion ,and worthwhile for spreading in clinical prac-tice .Analysis of the ultrasonographic performance of breast fibroadenoma is helpful to the diagnosis and differential di -agnosis of breast disease ,which can also improve the level of diagnosis .%目的:分析乳腺纤维腺瘤与乳腺结构不良症的影像学特征,探讨彩色多普勒超声检查女性乳腺肿块的临床诊断价值。方法回顾性分析20例女性彩色多普勒超声检查资料,部分病例术后病理检查。结果20例患者中,乳腺纤维腺瘤13例(65.0%),乳腺结构不良症6例(30.0%),乳腺化生性癌1例(5.0%)。典型的乳腺纤维腺瘤声像学表现形态规则、境界清晰,内回声均质。结论彩色超声检查乳腺病变简便有效无创,值得临床广泛推广。分析乳腺纤维腺瘤的声像图表现,有助于乳腺病的诊断和鉴别诊断,提高诊断水平。

  4. 新生儿室管膜下出血的彩色多普勒超声诊断价值分析%Neonatal subependymal hemorrhage analysis of the diagnostic value of color doppler ultrasound

    Institute of Scientific and Technical Information of China (English)

    余奕慧; 卓琳琅

    2016-01-01

    Objective To Analysis color doppler ultrasound diagnosis value in neonatal subependymal hemorrhage. Methods During February 2014 to February 2015,49 cases diagnosed as subependymal hemorrhage were set as observation group,the other 49 cases healthy newborn as control group,to all newborns of color doppler ultrasound. Results The SPV and DPV observation group was obviously higher than that of control group,P<0. 05). For observation group of children,the lower side of the SPV and DPV significantly higher than that of the healthy side,P<0. 05). Conclusion Color doppler ul-trasound can clearly show the actual situation of children subependymal hemorrhage, and it also has the advantages of low cost,safety,and can be used repeatedly. Therefore,it can be used in the diagnosis of neonatal subependymal hemorrhage.%目的:分析彩色多普勒超声诊断法用于新生儿室管膜下出血中的价值。方法选取2014年2月至2015年2月期间,49例诊断为室管膜下出血的患儿设为观察组,另选取49例健康新生儿作为对照组,对所有新生儿进行彩色多普勒超声检查。结果观察组SPV与DPV明显高于对照组,P<0.05。针对观察组患儿,其患侧SPV与DPV明显高于健侧,P<0.05。结论彩色多普勒超声能清楚显示患儿室管膜下出血的实际情况,且其还具备价格低廉、安全与可反复使用等优点。故,可将其用于新生儿室管膜下出血的诊断中。

  5. Clinical comparison of transabdominal and transvaginal color doppler ultrasound in diagnosis of early ectopic pregnancy%经腹及经阴道彩超诊断早期异位妊娠的临床对比分析

    Institute of Scientific and Technical Information of China (English)

    刘波

    2014-01-01

    目的:对比分析经腹及经阴道彩色多普勒超声在早期异位妊娠临床诊断中的应用价值。方法回顾我院2012年3月至2014年1月期间98例疑似异位妊娠患者临床资料、经腹彩色多普勒超声(tacds)检查结果、经阴道彩色多普勒超声(tVcds)检查结果及手术病理诊断结果。结果98例疑似异位妊娠患者,经手术病理确诊异位妊娠96例, tacds 检查诊断61例,符合率63.54%;tVcds 检查诊断88例,符合率91.67%。结论 tVcds 较 tacds 早期异位妊娠诊断率高,应在临床中推广应用。%Objective to investigate the clinical diagnosis value of transabdominal and transvaginal color doppler ultrasound in diagnosis of early ectopic pregnancy. Methods clinical data of 98 patients with suspected ectopic pregnancy in our hospital from March 2012 to January 2014 were reviewed including test results of transabdominal color doppler ultrasound (tacds),transvaginal color doppler ultrasound (tVcds) and surgical pathology. Results 98 patients with suspected ectopic pregnancy were confirmed 96 cases of ectopic pregnancy with pathologically . TACDS diagnosed 61 cases , in line with the rate of 63.54%; tVcds diagnosed 88 cases , in line with the rate of 91.67%.Conclusion compared tacds ,tVcds in early diagnosis of ectopic pregnancy has higher diagnosis rate, clinical application should be promoted.

  6. Clinical Value of Color Doppler Ultrasound in Diagnosis of Uterine Cavity Effusion%彩色多普勒超声对诊断宫腔积液性疾病的临床价值

    Institute of Scientific and Technical Information of China (English)

    黄冬玲

    2016-01-01

    目的::探讨彩色多普勒超声对宫腔积液性疾病的诊断价值。方法:选取东莞市石碣医院2013年4月~2015年4月收治的宫腔积液患者100例,分别采用经腹或经阴道彩色多普勒超声诊断,将检测结果与病检结果对照。结果:病理诊断宫腔粘连23例,宫外孕21例,宫颈癌13例,宫颈粘连12例,其他为内膜息肉、内膜癌等。超声确诊80例,漏诊7例,误诊13例。经阴道超声诊断总符合率明显高于经腹(P <0.05)。结论:宫腔积液采用彩色多普勒超声诊断符合率较高,能为确诊病因提供客观依据,值得应用。%Objective:To study the diagnostic value of color Doppler ultrasound in the diagnosis of uter-ine cavity effusion.Methods:100 patients with uterine cavity effusion were treated in a hospital from April 2013 to April 2015,who were diagnosed by abdominal or transvaginal color Doppler ultrasound,then the re-sults of the disease were compared.Results:23 cases were diagnosed with intrauterine adhesions,21 cases of ectopic pregnancy,13 cases of cervical cancer,12 cases of cervical adhesion,other for endometrial polyps, endometrial cancer,etc.Ultrasonic diagnosis of 80 cases,7 cases were missed diagnosis,13 cases were mis-diagnosed.The total coincidence rate of transvaginal ultrasound was higher than that of the abdomen,and the misdiagnosis rate was lower than that of the abdomen,and there were statistical differences (P <0.05). Conclusion:Color Doppler ultrasound diagnosis of uterine cavity effusion can provide objective evidence for etiological diagnosis,and the diagnostic accuracy rate is higher,but it can be used as the method of screening the cause of uterine cavity effusion.

  7. 彩色多普勒超声在下肢深静脉血栓诊断中的应用%Color doppler ultrasound in the diagnosis of lower extremity deep vein thrombosis

    Institute of Scientific and Technical Information of China (English)

    曾秀芳; 李志海; 郭芳青

    2010-01-01

    Objective To explore the value of color doppler ultrasound in the diagnosis of lower extremity deep vein thrombosis (DVT). Methods 36 patients with lower extremity DVT treated from January 2009 to December 2009 in our hospital were detected by color doppler ultrasound. Results The accurate rate of deep vein thrombosis in the lower extremity was 100.00%. 25 patients developed acute DVT.Two-dimension ultrasound showed the veins with embolism were widen, with low to moderate level of echo,without thickening dissepiments, and the lumens could not be press to closing. CDFI revealed signs of strip blood stream sign or without the signs. 11 patients had subacute or chronic DVT. Two-dimension ultrasound showed no obvious limit between dissepiments and thrombus, with thickening disaepiments and high level of echo. CDFI revealed signs of strip blood stream and affluent collateral branch blood stream. Conclusions Color doppler ultrasound is accurate and easy to run in the diagnosis of lower extremity deep vein thrombosis.It is worth popularizing.%目的 探讨彩色多普勒超声对下肢深静脉血栓(DVT)的诊断价值.方法 将2009年1月-2009年12月间在我院诊疗的下肢DVT患者36例进行彩色多普勒超声诊断,并了解其诊断价值.结果 彩色多普勒超声诊断准确率为100.00%.急性下肢DVT 25例,二维超声显示:栓塞静脉增宽,呈中低回声,管壁无增厚,管腔加压不能被压闭;CDFI可探及条状血流信号或无血流信号.亚急性和慢性下肢DVT 11例,二维超声显示:管壁与血栓界线欠清,管壁增厚,呈高回声;CDFI可探及条带状血流,可见丰富的侧支血流.结论 彩色多普勒超声对下肢DVT的诊断准确性高,操作方便,值得应用.

  8. Clinical value of color doppler ultrasonic diagnosis in gonarthromenigitis%彩色多普勒超声诊断膝关节滑膜炎的临床价值

    Institute of Scientific and Technical Information of China (English)

    万鑫

    2012-01-01

    Objective:To analyze the clinical application value of gonarthromenigitis by color doppler ultrasonic diagnosis and to conclude the characters of gonarthromenigitis ultrasonography. Methods: A total of 79 patients with gonarthromenigitis diagnosised by color doppler ultrasound in our hospital were collected to retrospective analysis. The characters of gonarthromenigitis ultrasonography were analyzed and compared to knee X-ray graphy and knee MRI graphy. Results:In detecting the changes of synovial hypertrophy, synovial morphology, arthroedema. Knee cartilage affection, the ultrasonography had satisfactory resolution power. The detection rates of above changes by ultrasonography were 92. 22%, 86. 67% . 83. 33% , 40. 00% respectively. The difference of detection rates between ultrasonography and X-ray graphy was significant ( P 0. 05). Conclusion: Color doppler ultrasonography was useful in the diagnosis of gonarthromenigitis. And was worth widing clinical application.%目的:探讨彩色多普勒超声对膝关节滑膜炎的声像图特点及其临床诊断价值.方法:回顾性分析我院79例诊断为膝关节滑膜炎患者,分析彩超检查声像图特点,并与膝关节X线平片及磁共振(MRI)作比较.结果:在滑膜厚度、滑膜形态、关节腔积液、软骨病变等方面彩超检查具有良好的分辨率,检出率分别为92.22%、86.67%、83.33%、40.00%,与膝关节X线平片比较,均有统计学差异(P<0.05);与膝关节MRI比较,均无统计学差异(P>0.05).结论:彩超对于膝关节滑膜炎的诊断具有较好的临床价值,值得推广.

  9. FX2-TH: a two-dimensional nuclear reactor kinetics code with thermal-hydraulic feedback

    Energy Technology Data Exchange (ETDEWEB)

    Shober, R.A.; Daly, T.A.; Ferguson, D.R.

    1978-10-01

    FX2-TH is a two-dimensional, time-dependent nuclear reactor kinetics program with thermal and hydraulic feedback. The neutronics model used is multigroup neutron diffusion theory. The following geometry options are available: x, r, x-y, r-z, theta-r, and triangular. FX2-TH contains two basic thermal and hydraulic models: a simple adiabatic fuel temperature calculation, and a more detailed model consisting of an explicit representation of a fuel pin, gap, clad, and coolant. FX2-TH allows feedback effects from both fuel temperature (Doppler) and coolant temperature (density) changes. FX2-TH will calculate a consistent set of steady state conditions by iterating between the neutronics and thermal-hydraulics until convergence is reached. The time-dependent calculation is performed by the use of the improved quasistatic method. A disk editing capability is available. FX2-TH is operational on IBM system 360 or 370 computers and on the CDC 7600.

  10. High resolution, two-dimensional imaging, microchannel plate detector for use on a sounding rocket experiment

    Science.gov (United States)

    Bush, Brett C.; Cotton, Daniel M.; Siegmund, Oswald H.; Chakrabarti, Supriya; Harris, Walter; Clarke, John

    1991-01-01

    We discuss a high resolution microchannel plate (MCP) imaging detector to be used in measurements of Doppler-shifted hydrogen Lyman-alpha line emission from Jupiter and the interplanetary medium. The detector is housed in a vacuum-tight stainless steel cylinder (to provide shielding from magnetic fields) with a MgF2 window. Operating at nominal voltage, the four plate configuration provides a gain of 1.2 x 10 exp 7 electrons per incident photon. The wedge-and-strip anode has two-dimensional imaging capabilities, with a resolution of 40 microns FWHM over a one centimeter diameter area. The detector has a high quantum efficiency while retaining a low background rate. A KBr photocathode is used to enhance the quantum efficiency of the bare MCPs to a value of 35 percent at Lyman-alpha.

  11. Ultrasonography and color Doppler in juvenile idiopathic arthritis: diagnosis and follow-up of ultrasound-guided steroid injection in the ankle region. A descriptive interventional study

    DEFF Research Database (Denmark)

    Laurell, Louise; Court-Payen, Michel; Nielsen, Susan;

    2011-01-01

    The ankle region is frequently involved in juvenile idiopathic arthritis (JIA) but difficult to examine clinically due to its anatomical complexity. The aim of the study was to evaluate the role of ultrasonography (US) of the ankle and midfoot (ankle region) in JIA. Doppler-US detected synovial...... hypertrophy, effusion and hyperemia and US was used for guidance of steroid injection and to assess treatment efficacy....

  12. Two-dimensional superconductors with atomic-scale thickness

    Science.gov (United States)

    Uchihashi, Takashi

    2017-01-01

    Recent progress in two-dimensional superconductors with atomic-scale thickness is reviewed mainly from the experimental point of view. The superconducting systems treated here involve a variety of materials and forms: elemental metal ultrathin films and atomic layers on semiconductor surfaces; interfaces and superlattices of heterostructures made of cuprates, perovskite oxides, and rare-earth metal heavy-fermion compounds; interfaces of electric-double-layer transistors; graphene and atomic sheets of transition metal dichalcogenide; iron selenide and organic conductors on oxide and metal surfaces, respectively. Unique phenomena arising from the ultimate two dimensionality of the system and the physics behind them are discussed.

  13. TreePM Method for Two-Dimensional Cosmological Simulations

    Indian Academy of Sciences (India)

    Suryadeep Ray

    2004-09-01

    We describe the two-dimensional TreePM method in this paper. The 2d TreePM code is an accurate and efficient technique to carry out large two-dimensional N-body simulations in cosmology. This hybrid code combines the 2d Barnes and Hut Tree method and the 2d Particle–Mesh method. We describe the splitting of force between the PM and the Tree parts. We also estimate error in force for a realistic configuration. Finally, we discuss some tests of the code.

  14. Singular analysis of two-dimensional bifurcation system

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Bifurcation properties of two-dimensional bifurcation system are studied in this paper.Universal unfolding and transition sets of the bifurcation equations are obtained.The whole parametric plane is divided into several different persistent regions according to the type of motion,and the different qualitative bifurcation diagrams in different persistent regions are given.The bifurcation properties of the two-dimensional bifurcation system are compared with its reduced one-dimensional system.It is found that the system which is reduced to one dimension has lost many bifurcation properties.

  15. Critical Behaviour of a Two-Dimensional Random Antiferromagnet

    DEFF Research Database (Denmark)

    Als-Nielsen, Jens Aage; Birgeneau, R. J.; Guggenheim, H. J.

    1976-01-01

    A neutron scattering study of the order parameter, correlation length and staggered susceptibility of the two-dimensional random antiferromagnet Rb2Mn0.5Ni0.5F4 is reported. The system is found to exhibit a well-defined phase transition with critical exponents identical to those of the isomorphou...... pure materials K2NiF4 and K2MnF4. Thus, in these systems, which have the asymptotic critical behaviour of the two-dimensional Ising model, randomness has no measurable effect on the phase-transition behaviour....

  16. Nonlinear excitations in two-dimensional molecular structures with impurities

    DEFF Research Database (Denmark)

    Gaididei, Yuri Borisovich; Rasmussen, Kim; Christiansen, Peter Leth

    1995-01-01

    We study the nonlinear dynamics of electronic excitations interacting with acoustic phonons in two-dimensional molecular structures with impurities. We show that the problem is reduced to the nonlinear Schrodinger equation with a varying coefficient. The latter represents the influence of the imp......We study the nonlinear dynamics of electronic excitations interacting with acoustic phonons in two-dimensional molecular structures with impurities. We show that the problem is reduced to the nonlinear Schrodinger equation with a varying coefficient. The latter represents the influence...... excitations. Analytical results are in good agreement with numerical simulations of the nonlinear Schrodinger equation....

  17. Vortices in the Two-Dimensional Simple Exclusion Process

    Science.gov (United States)

    Bodineau, T.; Derrida, B.; Lebowitz, Joel L.

    2008-06-01

    We show that the fluctuations of the partial current in two dimensional diffusive systems are dominated by vortices leading to a different scaling from the one predicted by the hydrodynamic large deviation theory. This is supported by exact computations of the variance of partial current fluctuations for the symmetric simple exclusion process on general graphs. On a two-dimensional torus, our exact expressions are compared to the results of numerical simulations. They confirm the logarithmic dependence on the system size of the fluctuations of the partial flux. The impact of the vortices on the validity of the fluctuation relation for partial currents is also discussed in an Appendix.

  18. Two-dimensional hazard estimation for longevity analysis

    DEFF Research Database (Denmark)

    Fledelius, Peter; Guillen, M.; Nielsen, J.P.

    2004-01-01

    the two-dimensional mortality surface. Furthermore we look at aggregated synthetic population metrics as 'population life expectancy' and 'population survival probability'. For Danish women these metrics indicate decreasing mortality with respect to chronological time. The metrics can not directly be used......We investigate developments in Danish mortality based on data from 1974-1998 working in a two-dimensional model with chronological time and age as the two dimensions. The analyses are done with non-parametric kernel hazard estimation techniques. The only assumption is that the mortality surface...... for analysis of economic implications arising from mortality changes....

  19. Field analysis of two-dimensional focusing grating couplers

    Science.gov (United States)

    Borsboom, P.-P.; Frankena, H. J.

    1995-05-01

    A different technique was developed by which several two-dimensional dielectric optical gratings, consisting 100 or more corrugations, were treated in a numerical reliable approach. The numerical examples that were presented were restricted to gratings made up of sequences of waveguide sections symmetric about the x = 0 plane. The newly developed method was effectively used to investigate the field produced by a two-dimensional focusing grating coupler. Focal-region fields were determined for three symmetrical gratings with 19, 50, and 124 corrugations. For focusing grating coupler with limited length, high-frequency intensity variations were noted in the focal region.

  20. Self-assembly of two-dimensional DNA crystals

    Institute of Scientific and Technical Information of China (English)

    SONG Cheng; CHEN Yaqing; WEI Shuai; YOU Xiaozeng; XIAO Shoujun

    2004-01-01

    Self-assembly of synthetic oligonucleotides into two-dimensional lattices presents a 'bottom-up' approach to the fabrication of devices on nanometer scale. We report the design and observation of two-dimensional crystalline forms of DNAs that are composed of twenty-one plane oligonucleotides and one phosphate-modified oligonucleotide. These synthetic sequences are designed to self-assemble into four double-crossover (DX) DNA tiles. The 'sticky ends' of these tiles that associate according to Watson-Crick's base pairing are programmed to build up specific periodic patterns upto tens of microns. The patterned crystals are visualized by the transmission electron microscopy.