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Journal of Computer Assisted Tomography

Yoel Siegel, Felipe Munera, Anthony M Durso, Patrick Roth
We present a 70-year-old woman who had an intra-aortic balloon pump (IABP) in its deflated state in the aorta during a computed tomography angiogram scan. The scan was performed to assess for aortic dissection. The deflated IABP created a curvilinear filling defect in the aortic lumen that suggested an intimal flap. Herein, we described the finding and suggest key features that can help distinguish between this intra-aortic device and a true dissection. This distinction between the device and aortic dissection is not only important because of the potential pitfall of a false positive diagnosis but also because an IABP itself can lead to an aortic dissection and therefore its computed tomography features should be recognized in both its inflated and deflated state...
February 27, 2018: Journal of Computer Assisted Tomography
Shaojun Li, Hongning Jiang, Bo Wang, Mingjun Gu, Ning Zhang, Wenwen Liang, Yu Wang
OBJECTIVE: Leptin acts to influence bone metabolism through indirect hypothalamic relay and direct peripheral pathways. Leptin enhances the differentiation of mesenchymal stem cells to the osteoblast rather than the adipocyte lineage, but the in vivo impacts of leptin on ovariectomy (OVX)-induced marrow adiposity are poorly understood. In this work, we aimed to address this question. METHODS: Forty-five female New Zealand rabbits were divided into sham + vehicle, OVX + vehicle, and OVX + leptin for 5 months...
February 27, 2018: Journal of Computer Assisted Tomography
Ghada Issa, Derik Davis, Michael E Mulligan
OBJECTIVE: The objective of this study was to determine if dual-energy computed-tomography bone marrow color maps can improve sensitivity, specificity, accuracy, and confidence of detection of bone metastases. METHODS: Institutional review board approved this retrospective review of a consecutive series of cancer patients. Two radiologists first evaluated the fused 120 kV computed tomography images and recorded a number of suspicious lesions, confidence level, and Hounsfield units for each lesion...
February 27, 2018: Journal of Computer Assisted Tomography
Saya Horiuchi, Taiki Nozaki, Atsushi Tasaki, Sachiko Ohde, Gautam A Deshpande, Jay Starkey, Takeshi Hara, Nobuto Kitamura, Hiroshi Yoshioka
OBJECTIVE: The aims of this study were to compare isotropic 3-dimensional fat-suppressed T2-weighted fast spin echo (FSE) imaging (T2FS) with 2-dimensional fat-suppressed proton-density-weighted FSE imaging (2D-PDFS) and evaluate feasibility of isotropic 3-dimensional FSE shoulder imaging at 3-T magnetic resonance imaging (MRI). METHODS: Seventy-eight patients who underwent shoulder MRI were evaluated. Three-dimensional T2FS and 2D-PDFS were qualitatively graded for delineation of anatomic structures...
February 27, 2018: Journal of Computer Assisted Tomography
Jeffrey R Sachs, Michael E Zapadka, Allen D Elster
BACKGROUND AND PURPOSE: The aim of the study was to describe the prevalence and characteristics of orbital interstitial fluid seen on magnetic resonance (MR) images of infants and young children. MATERIALS AND METHODS: Fat-suppressed axial T2-weighted MR images of 100 consecutive infants and young children (<6 years) without orbital pathology were retrospectively reviewed by 2 neuroradiologists. The presence, location, and extent of high-signal orbital interstitial fluid were characterized and tabulated as a function of age...
February 27, 2018: Journal of Computer Assisted Tomography
Hanna Liu, David Imagawa, Garrett Ward, Navjit Dullet, Chandana Lall
PURPOSE: This study was conducted to assess the prevalence and significance of "haziness" around the hepatic artery and celiac axis in patients after pancreaticoduodenectomy. METHODS: This retrospective study was conducted on 116 patients who underwent pancreaticoduodenectomy or a similar procedure and had no clinical evidence of tumor recurrence or malignancy within 2 years from the date of surgery. RESULTS: Most images exhibited at least mild to moderate haziness around the hepatic artery and celiac axis...
February 27, 2018: Journal of Computer Assisted Tomography
Muthu Rama Krishnan Mookiah, Karupppasamy Subburaj, Kai Mei, Felix K Kopp, Johannes Kaesmacher, Pia M Jungmann, Peter Foehr, Peter B Noel, Jan S Kirschke, Thomas Baum
Multidetector computed tomography-based trabecular bone microstructure analysis ensures promising results in fracture risk prediction caused by osteoporosis. Because multidetector computed tomography is associated with high radiation exposure, its clinical routine use is limited. Hence, in this study, we investigated in 11 thoracic midvertebral specimens whether trabecular texture parameters are comparable derived from (1) images reconstructed using statistical iterative reconstruction (SIR) and filtered back projection as criterion standard at different exposures (80, 150, 220, and 500 mAs) and (2) from SIR-based sparse sampling projections (12...
February 27, 2018: Journal of Computer Assisted Tomography
Faye Y Chiou-Tan, Joslyn John, Lawrence R Robinson, John C Cianca, Katherine H Taber
No abstract text is available yet for this article.
February 27, 2018: Journal of Computer Assisted Tomography
Andrea Agostini, Usman Mahmood, Yusuf Erdi, Alessandra Borgheresi, Monica Ragucci, Peter Sawan, Davinia Ryan, Maria Elena Laino, Giuseppe Corrias, Lorenzo Mannelli
OBJECTIVE: To evaluate the accuracy of single-source dual-energy computed tomography (ssDECT) in iodine quantification using various segmentation methods in an ex vivo model. METHODS: Ten sausages, injected with variable quantities of iodinated contrast, were inserted into 2 livers and scanned with ssDECT. Material density iodine images were reconstructed. Three radiologists segmented each sausage. Iodine concentration, volume, and absolute quantity were measured...
February 27, 2018: Journal of Computer Assisted Tomography
Pairash Saiviroonporn, Pornpim Korpraphong, Vip Viprakasit, Rungroj Krittayaphong
OBJECTIVES: The objectives of this study were to develop and test an automated segmentation of R2* iron-overloaded liver images using fuzzy c-mean (FCM) clustering and to evaluate the observer variations. MATERIALS AND METHODS: Liver R2* images and liver iron concentration (LIC) maps of 660 thalassemia examinations were randomly separated into training (70%) and testing (30%) cohorts for development and evaluation purposes, respectively. Two-dimensional FCM used R2* images, and the LIC map was implemented to segment vessels from the parenchyma...
February 13, 2018: Journal of Computer Assisted Tomography
Ying Liang, Xiaomeng Li, Huan Wan, Yan Fang, Rong Zheng, Wenjie Zhang, Ying Liu, Cong Chen, Ning Wu
OBJECTIVE: The aim of the study was to assess the prognostic impact of volume-based metabolic F-fluorodeoxyglucose-positron emission tomography/ computed tomography (F-FDG-PET/CT) parameters in patients with stage IB-IVA squamous cell cervical carcinoma (SCCC). MATERIALS AND METHODS: We reviewed the pretreatment F-FDG-PET/CT records of 67 patients with stage IB-IVA SCCC. The maximum standardized uptake value (SUVmax) of the primary tumor (PSUVmax), highest SUVmax of the whole malignant lesions (WSUVmax), metabolic tumor volume (MTV) of the primary tumor (PMTV), MTV of the whole malignant lesion (WMTV), total lesion glycolysis (TLG) of primary tumor (PTLG), and TLG of the whole malignant lesion (WTLG) were obtained...
January 24, 2018: Journal of Computer Assisted Tomography
Xiuzhu Huang, Zebin Xiao, Yuyang Zhang, Na Lin, Meilian Xiong, Xinyao Huang, Qi Chen, Dairong Cao
OBJECTIVE: The aim of this study was to evaluate the usefulness of gadobenate dimeglumine-enhanced magnetic resonance imaging in characterizing the grade of hepatocellular carcinoma (HCC) using the signal intensity (SI) of the erector spinae as internal reference. MATERIALS AND METHODS: Clinical data of 40 patients (a total of 44 lesions) confirmed by pathology for HCC were retrospectively reviewed. Gadobenate dimeglumine-enhanced magnetic resonance imaging was performed in all patients, and SI of lesions (SIles), liver parenchyma around the lesions (SIhep), erector spinae (SImus) and standard deviation of SI of the surrounding noise (SDnoi) on nonenhanced T2WI, nonenhanced T1WI, and contrast-enhanced T1WI (in both arterial and hepatobiliary phase [AP and HBP]) were measured, respectively...
January 24, 2018: Journal of Computer Assisted Tomography
Einat Slonimsky, Jacob Korach, Tamar Perri, Tima Davidson, Sara Apter, Yael Inbar
OBJECTIVE: The aim of the study was to evaluate the radiological characteristics of gynecological lymphoproliferative disease (LPD) and specific imaging features that may suggest the diagnosis. METHODS: Two readers conducted a retrospective evaluation of imaging studies of 13 female patients presenting with a gynecological LPD. A literature review was also performed. RESULTS: Of the 13 evaluated women, 9 had ovarian involvement, 3 had cervical involvement, and 1 had uterine involvement...
January 24, 2018: Journal of Computer Assisted Tomography
Weixingzi Xu, Jianbo Wen, Chong Sun, Jiawen Cao, Yuxin Li, Daoying Geng
PURPOSES: The aims of the study were to analyze the conventional and diffusion-weighted MRI (DWI) of mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) and to investigate underlying mechanisms. METHODS: Features of 58 acute and 68 chronic stroke-like lesions as well as global brain abnormalities of 40 Chinese MELAS patients were analyzed. RESULTS: Gyriform DWI hyperintensity with decreased apparent diffusion coefficient (ADC) and patchy DWI hyperintensity with normal ADC were noted in 56 of 58 and 2 of 58 cortical regions of acute lesions, respectively...
January 24, 2018: Journal of Computer Assisted Tomography
Tilman Hickethier, Andra-Iza Iuga, Simon Lennartz, Myriam Hauger, Jonathan Byrtus, Julian A Luetkens, Stefan Haneder, David Maintz, Jonas Doerner
OBJECTIVE: We aimed to determine optimal window settings for conventional polyenergetic (PolyE) and virtual monoenergetic images (MonoE) derived from abdominal portal venous phase computed tomography (CT) examinations on a novel dual-layer spectral-detector CT (SDCT). METHODS: From 50 patients, SDCT data sets MonoE at 40 kiloelectron volt as well as PolyE were reconstructed and best individual window width and level values manually were assessed separately for evaluation of abdominal arteries as well as for liver lesions...
January 24, 2018: Journal of Computer Assisted Tomography
Minghui Tang, Kazuya Oshinomi, Kinya Ishizaka, Khin Khin Tha, Toru Yamamoto
OBJECTIVE: The objective of this study was to show the effect of the number of sampling points (NS) and the maximum b value (bmax) on fiber crossing detection in diffusion spectrum imaging (DSI) in clinical practice. METHODS: We performed 3-Tesla DSI in which we changed the NS (62-258) while keeping bmax at 8000 s/mm and in which we changed the bmax (4000-8000 s/mm) while keeping the NS at 129. The superior longitudinal fasciculus volume and the proportion of nerve voxels in which at least 2 (Rcr2) or 3 (Rcr3) nerve fiber bundles crossed were calculated...
January 24, 2018: Journal of Computer Assisted Tomography
Michiel Herteleer, Sanne Vancleef, Stefaan Nijs, Jos Vander Sloten
OBJECTIVE: The aim of the study was to investigate the influence of tube current reduction on the segmentation accuracy of the scapula. METHODS: A human cadaver was computed tomography scanned multiple times while reducing tube current amperage. The images were segmented using 2 different segmentation methods (N = 28). Subsequently the scapula was dissected and all soft tissues were removed. An optical laser scan of the dissected scapula was aligned and compared with the segmented meshes of the different computed tomography scans...
January 24, 2018: Journal of Computer Assisted Tomography
Chuanzi Li, Dongzhi Cen, Zaiyi Liu, Changhong Liang
PURPOSE: The objective of this study was to explore the prognostic significance of the preoperative computed tomography (CT) features in clear cell renal cell carcinoma. PATIENTS AND METHODS: The clinical data and CT data from 210 patients (1 grade 1, 84 grade 2, 92 grade 3, and 32 grade 4) generated with The Cancer Imaging Archive were reviewed. Overall survival was assessed using Kaplan-Meyer analysis. The relationship between CT features and survivals were evaluated using univariate and multivariable Cox regression analysis...
December 28, 2017: Journal of Computer Assisted Tomography
Girolamo Crisi, Silvano Filice, Maria Michiara, Pellegrino Crafa, Silvia Lana
OBJECTIVE: The objective of this study was to assess the effective performance of short echo time magnetic resonance spectroscopy (short TE MRS) for 2HG detection as biomarker of isocitrate dehydrogenase (IDH) status in all grade glioma (GL). METHODS: A total of 82 GL patients were prospectively investigated by short TEMRS at 3.0 T as part of a multimodal magnetic resonance imaging study protocol. Spectral analysis was performed using linear combination model. Tumor specimens were diagnosed as IDH mutant or wild type according to the 2016 World Health Organization (WHO) classification of brain tumors...
December 28, 2017: Journal of Computer Assisted Tomography
Berhan Pirimoglu, Recep Sade, Muhammed Sedat Sakat, Hayri Ogul, Akin Levent, Mecit Kantarci
OBJECTIVES: The objective of this study was to evaluate image quality of low dose in noncontrast paranasal sinus computed tomography (CT) using single volumetric 320-row multidetector CT technique. METHODS: The low-dose protocol including tube voltage of 135 kV and tube current of 5 mAs was chosen based on results of the present phantom study. Forty-six patients were assigned to control group with factory standard settings (120 kVp, 75 mAs), and 46 patients were assigned to study group and underwent noncontrast CT of paranasal sinus with low-dose protocol using single volumetric 320-row multidetector CT device...
December 28, 2017: Journal of Computer Assisted Tomography
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