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Journal of Computer Assisted Tomography

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https://www.readbyqxmd.com/read/28937496/characterizing-intraorbital-optic-nerve-changes-on-diffusion-tensor-imaging-in-thyroid-eye-disease-before-dysthyroid-optic-neuropathy
#1
Hwa Lee, Young Hen Lee, Sang-Il Suh, Eun-Kee Jeong, Sehyun Baek, Hyung Suk Seo
OBJECTIVE: The aim of this study was to determine whether the optic nerve is affected by thyroid eye disease (TED) before the development of dysthyroid optic neuropathy with diffusion-tensor imaging (DTI). METHODS: Twenty TED patients and 20 controls were included. The mean, axial, and radial diffusivities and fractional anisotropy (FA) value were measured at the optic nerves in DTI. Extraocular muscle diameters were measured on computed tomography. The diffusivities and FA of the optic nerves were compared between TED and controls and between active and inactive stages of TED...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937495/noninvasive-computed-tomography-derived-fractional-flow-reserve-based-on-structural-and-fluid-analysis-reproducibility-of-on-site-determination-by-unexperienced-observers
#2
Keiken Ri, Kanako K Kumamaru, Shinichiro Fujimoto, Yuko Kawaguchi, Tomotaka Dohi, Sou Yamada, Kazuhisa Takamura, Yosuke Kogure, Norikazu Yamada, Etsuro Kato, Ryusuke Irie, Tomohiro Takamura, Michimasa Suzuki, Masaaki Hori, Shigeki Aoki, Hiroyuki Daida
OBJECTIVE: The aim of this study was to evaluate the reproducibility of computed tomography (CT)-derived fractional flow reserve (FFR) determined on site by inexperienced observers using a postprocessing software based on structural and fluid analysis. METHODS: Using 21 coronary vessels in 7 patients who underwent 320-row coronary CT angiography and catheter-FFR, 2 independent inexperienced observers (A: a student radiation technologist; B: a nonmedical staff) determined the CT-FFR using a postprocessing software...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937494/high-pitch-coronary-computed-tomographic-angiography-using-the-third-generation-dual-source-computed-tomography-initial-experience-in-patients-with-high-heart-rate
#3
Ruiqi Feng, Jingsong Mao, Xiaofei Liu, Yu Zhao, Jiajie Tong, Liang Zhang
OBJECTIVE: This study aimed to evaluate the feasibility, image quality, and radiation dose of prospectively high-pitch coronary computed tomographic (CT) angiography in patients with high heart rates (HRs) using the third-generation dual-source CT. METHODS: One hundred consecutive patients with sinus rhythm and HR between 70 and 100 beats per minute were enrolled into this study. All patients were divided into 2 groups. Patients in group A (n = 46) were examined with prospectively high-pitch scan mode in which image acquisition was triggered at 30% of the R-R interval...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937493/adaptive-statistical-iterative-reconstruction-v-versus-adaptive-statistical-iterative-reconstruction-impact-on-dose-reduction-and-image-quality-in-body-computed-tomography
#4
Marco Gatti, Filippo Marchisio, Marco Fronda, Osvaldo Rampado, Riccardo Faletti, Laura Bergamasco, Roberto Ropolo, Paolo Fonio
OBJECTIVE: The aim of this study was to evaluate the impact on dose reduction and image quality of the new iterative reconstruction technique: adaptive statistical iterative reconstruction (ASIR-V). METHODS: Fifty consecutive oncologic patients acted as case controls undergoing during their follow-up a computed tomography scan both with ASIR and ASIR-V. Each study was analyzed in a double-blinded fashion by 2 radiologists. Both quantitative and qualitative analyses of image quality were conducted...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937492/magnetic-resonance-imaging-of-the-soft-tissue-vascular-anomalies-in-torso-and-extremities-in-children-an-update-with-2014-international-society-for-the-study-of-vascular-anomalies-classification
#5
Elizabeth Snyder, Kate Puttgen, Sally Mitchell, Shivani Ahlawat, Aylin Tekes
Vascular anomalies can occur anywhere in the body, and the majority present in the pediatric population. Accurate classification is essential for proper clinical evaluation, particularly because multidisciplinary care is often required. The International Society for the Study of Vascular Anomalies classification offers a comprehensive classification for all subspecialties. In this review article, we present a magnetic resonance imaging protocol with exemplary cases of the most common types of vascular anomalies in the pediatric trunk and extremities using the current International Society for the Study of Vascular Anomalies classification...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937491/improved-calcium-scoring-at-dual-energy-computed-tomography-angiography-using-a-high-z-contrast-element-and-novel-material-separation-technique
#6
Jack W Lambert, Yuxin Sun, Karen G Ordovas, Robert G Gould, Sizhe Wang, Benjamin M Yeh
OBJECTIVES: The aim of this study was to compare the accuracy of existing dual-energy computed tomography (CT) angiography coronary artery calcium scoring methods to those obtained using an experimental tungsten-based contrast material and a recently described contrast material extraction process (CMEP). METHODS: Phantom coronary arteries of varied diameters, with different densities and arcs of simulated calcified plaque, were sequentially filled with water, iodine, and tungsten contrast materials and scanned within a thorax phantom at rapid-kVp-switching dual-energy CT...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937490/the-relationship-between-body-mass-index-and-fatty-infiltration-in-the-shoulder-musculature
#7
David F Dow, Kaushal Mehta, Yuanfang Xu, Eric England
OBJECTIVE: Fatty infiltration in the rotator cuff muscles has been well studied in the setting of rotator cuff tendon tears to help predict outcomes of surgical repair. Fatty infiltration in the rotator cuff has also been independently correlated to the variables of age and sex. The purpose of our study was to determine if there is a relationship between body mass index and fatty infiltration in patients with no imaging evidence of rotator cuff tendinosis or tear. METHODS: Radiology reports of all magnetic resonance imaging examinations of the shoulder were searched over a 2-year period...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937489/a-novel-registration-based-semiautomatic-mandible-segmentation-pipeline-using-computed-tomography-images-to-study-mandibular-development
#8
Ying Ji Chuang, Benjamin M Doherty, Nagesh Adluru, Moo K Chung, Houri K Vorperian
OBJECTIVE: We present a registration-based semiautomatic mandible segmentation (SAMS) pipeline designed to process a large number of computed tomography studies to segment 3-dimensional mandibles. METHOD: The pipeline consists of a manual preprocessing step, an automatic segmentation step, and a final manual postprocessing step. The automatic portion uses a nonlinear diffeomorphic method to register each preprocessed input computed tomography test scan on 54 reference templates, ranging in age from birth to 19 years...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937488/the-significance-of-arachnoid-granulation-in-patients-with-idiopathic-intracranial-hypertension
#9
Gaurav Vishwasrao Watane, Bhumi Patel, Derek Brown, M Reza Taheri
PURPOSE: The aim of this article was to study the significance of arachnoid granulations (AGs) in patients with idiopathic intracranial hypertension (IIH). METHODS: In an institutional review board-approved retrospective chart review study, 79 patients with clinical diagnosis of idiopathic increased intracranial pressure were compared with 63 patients with a diagnosis of multiple sclerosis. Inclusion criteria also included available magnetic resonance imaging (MRI) of the brain, older than 18 years, and female sex...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937487/focal-hepatic-glycogenosis-in-a-patient-with-uncontrolled-diabetes-mellitus-type-1
#10
Tetiana Glushko, Sergiy V Kushchayev, Dmitry Trifanov, Aliaksei Salei, Diego Morales, Gerard Berry, Justin Mackey, Oleg M Teytelboym
Hepatomegaly and elevated liver enzymes in patients with diabetes are commonly associated with fatty liver disease. However, physicians often forget about another intrinsic substance that can cause a similar clinical picture-glycogen. Liver stores approximately one third of the total body glycogen and is responsible for blood glucose homeostasis. Excessive hepatocellular glycogen accumulation occurs not only in congenital glycogen storage diseases, but also in acquired conditions associated with hyperglycemic-hyperinsulinemic states such as uncontrolled diabetes mellitus, high-dose corticosteroid use, and dumping syndrome...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937486/iterative-metallic-artifact-reduction-for-in-plane-gonadal-shielding-during-computed-tomographic-venography-of-young-males
#11
Jin Woo Choi, Sang Yub Lee, Jong Hyo Kim, Hyeongmin Jin, Jaewon Lee, Young Hun Choi, Hyeon-Kyeong Lee, Jae Hyung Park
OBJECTIVE: The purpose of this study was to evaluate a gonadal shield (GS) and iterative metallic artifact reduction (IMAR) during computed tomography scans, regarding the image quality and radiation dose. METHODS: A phantom was imaged with and without a GS. Prospectively enrolled, young male patients underwent lower extremity computed tomography venography (precontrast imaging without the GS and postcontrast imaging with the GS). Radiation dose was measured each time, and the GS-applied images were reconstructed by weighted filtered back projection and IMAR...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937485/monitoring-dynamic-morphological-changes-with-electrocardiography-gated-dynamic-4-dimensional-computed-tomography-angiography-to-predict-intraoperative-rupture-of-intracranial-aneurysms
#12
Yan Gu, Lun Xu, Chunhong Hu, Meng Luo, Hongwei Zhang, Xiguang Liu
OBJECTIVE: This study aims to evaluate dynamic morphological changes of intracranial aneurysms to predict intraoperative aneurysm rupture (IAR) during clipping. METHODS: Included in this study were 153 patients, who had ruptured and microsurgical-clipped aneurysms. All patients underwent dual-source computed tomography examination of electrocardiography-gated dynamic 4-dimensional computed tomography angiography before clipping. Original scanning data were reconstructed to produce 20 data sets of cardiac cycles with 5% time intervals...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937484/diagnostic-accuracy-of-qualitative-and-quantitative-computed-tomography-analysis-for-diagnosis-of-pathological-grade-and-stage-in-upper-tract-urothelial-cell-carcinoma
#13
Suraj Mammen, Satheesh Krishna, Matthew Quon, Wael M Shabana, Shaheed W Hakim, Trevor A Flood, Nicola Schieda
OBJECTIVE: The aim of this study was to compare grade and stage of upper tract urothelial cell carcinoma (UCC) using computed tomography. MATERIALS AND METHODS: With institutional review board approval, 48 patients with 49 UCC (44 high grade and 5 low grade, 26 ≤ T1 and 23 ≥ T2) underwent nephroureterectomy and preoperative computed tomography between 2013 and 2015. Two blinded radiologists assessed for tumor appearance (filling defect/mass or wall thickening/stricture), margin (smooth or spiculated/irregular), texture (homogeneous, heterogeneous), hydronephrosis, and calcification...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937483/diagnosis-of-mesenteric-ectopic-pancreas-by-secretin-enhanced-magnetic-resonance-cholangiopancreatography
#14
Ana Moreno Pastor, José Ramón Olalla Muñoz, Pilar Esteban Delgado, Victoriano Soria Aledo
Ectopic pancreas (EP) is defined as pancreatic tissue found outside its usual anatomical position, with no ductal or vascular communication with the native pancreas.We report the case of a 59-year-old woman with a mesenteric jejunal EP initially suspected on computed tomography and confirmed by secretin-enhanced magnetic resonance cholangiopancreatography.Mesenteric EP is a very rare finding with nonspecific clinical presentation, so that, classic radiological findings have not been well described previously...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937482/diffusion-tensor-imaging-of-lumbar-vertebras-in-female-adolescent-idiopathic-scoliosis-initial-findings
#15
Dongmei Wang, Shoufeng Wang, Yao Gao, Zhengyang Zhou, Jian He
OBJECTIVE: The purpose of this study was to characterize diffusion tensor imaging (DTI) features of lumbar vertebras in adolescent idiopathic scoliosis (AIS) patients. METHODS: Fifty-two AIS patients and 20 healthy volunteers underwent 3-T magnetic resonance scanning including DTI sequence. The fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values on the convex and concave sides of lumbar vertebras were obtained and compared. RESULTS: The FA and ADC values differed significantly between the convex and concave side of lumbar vertebras in AIS (P < 0...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28937481/optimization-of-computed-tomography-coronary-angiography-for-improved-plaque-detection
#16
Hany Kashani, Graham Wright, Ali Ursani, Garry Liu, Masoud Hashemi, Narinder S Paul
OBJECTIVE: The study aims to optimize visualization of the coronary wall during computed tomography coronary angiography. METHODS: A coronary plaque phantom was scanned on a wide-volume computed tomography scanner. Spatial resolution, contrast resolution, and vessel wall thickness were measured at different x-ray tube currents and voltages. RESULTS: Spatial resolution ranged from 0.385 to 0.625 mm and was significantly lower at higher currents...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28806322/reduced-field-of-view-diffusion-weighted-magnetic-resonance-imaging-of-the-prostate-at-3-tesla-comparison-with-standard-echo-planar-imaging-technique-for-image-quality-and-tumor-assessment
#17
Tsutomu Tamada, Justin M Ream, Ankur M Doshi, Samir S Taneja, Andrew B Rosenkrantz
OBJECTIVE: The purpose of this study was to compare image quality and tumor assessment at prostate magnetic resonance imaging (MRI) between reduced field-of-view diffusion-weighted imaging (rFOV-DWI) and standard DWI (st-DWI). METHODS: A total of 49 patients undergoing prostate MRI and MRI/ultrasound fusion-targeted biopsy were included. Examinations included st-DWI (field of view [FOV], 200 × 200 mm) and rFOV-DWI (FOV, 140 × 64 mm) using a 2-dimensional (2D) spatially-selective radiofrequency pulse and parallel transmission...
August 12, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28806321/liver-imaging-reporting-and-data-system-discordance-between-computed-tomography-and-gadoxetate-enhanced-magnetic-resonance-imaging-for-detection-of-hepatocellular-carcinoma-major-features
#18
Victoria Chernyak, Milana Flusberg, Amy Law, Mariya Kobi, Viktoriya Paroder, Alla M Rozenblit
PURPOSE: The goal of this study was to compare agreement between computed tomography (CT) and magnetic resonance imaging (MRI) in the evaluation of the major Liver Imaging Reporting and Data System (LI-RADS) features used in assessment of hepatocellular carcinoma: arterial phase hyperenhancement (APHE), portal venous phase washout (WO), capsule appearance (capsule), and largest diameter (diameter). METHODS: Patients with liver protocol CT and gadoxetate-enhanced MRI within 1 month of each other and at least 1 discrete untreated liver lesion were included...
August 12, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28806320/the-value-of-quality-assured-magnetic-resonance-imaging-of-the-breast-for-the-early-detection-of-breast-cancer-in-asymptomatic-women
#19
Uwe Fischer, Susanne Luftner-Nagel, Friedemann Baum, Katharina Marten-Engelke, Susanne Wienbeck
PURPOSE: The aim of this study was to evaluate the exclusive performance of quality-assured high-resolution breast magnetic resonance imaging (MRI) for early detection of breast cancer in a population of asymptomatic women. MATERIALS AND METHODS: A total of 1189 MRI examinations performed in 789 asymptomatic women (mean age, 51.1 years) were evaluated. All examinations were performed using open bilateral surface coil, dedicated compression device, and high spatial resolution (matrix, 512 × 512)...
August 12, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28806319/transient-segmental-enhancement-of-pyogenic-liver-abscess-a-comparison-between-contrast-enhanced-ultrasound-and-computed-tomography
#20
Kun Sun, Wei Zhu, Yan Luo, Yongzhong Li, Xiang Zhou
OBJECTIVE: This study aimed to investigate the correlation between the transient segmental enhancement (TSE) of liver abscesses on contrast-enhanced ultrasound (CEUS) imaging and contrast-enhanced computed tomography (CT) scans. METHODS: In total, 42 abscesses in 38 patients were evaluated with real-time CEUS and contrast-enhanced CT imaging. The CT imaging and CEUS examinations were performed within one to 2 days of each other in all cases. The initial reports of the observations of TSE on CEUS scans were correlated later with the findings of TSE on contrast-enhanced CT images...
August 12, 2017: Journal of Computer Assisted Tomography
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