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Journal of Computer Assisted Tomography

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https://www.readbyqxmd.com/read/30407249/assessing-the-relationship-between-american-heart-association-atherosclerotic-cardiovascular-disease-risk-score-and-coronary-artery-imaging-findings
#1
Ying Li, Guangming Zhu, Victoria Ding, Bin Jiang, Robyn L Ball, Neera Ahuja, Fatima Rodriguez, Dominik Fleischmann, Manisha Desai, David Saloner, Luca Saba, Max Wintermark, Jason Hom
OBJECTIVE: The aim of this study was to characterize the relationship between computed tomography angiography imaging characteristics of coronary artery and atherosclerotic cardiovascular disease (ASCVD) score. METHODS: We retrospectively identified all patients who underwent a coronary computed tomography angiography at our institution from December 2013 to July 2016, then we calculated the 10-year ASCVD score. We characterized the relationship between coronary artery imaging findings and ASCVD risk score...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407248/introduction-to-dual-energy-computed-tomography
#2
Allen D Elster
No abstract text is available yet for this article.
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407247/transmural-myocardial-scar-assessed-by-cardiac-computed-tomography-predictor-of-echocardiographic-versus-clinical-response-to-cardiac-resynchronization-therapy
#3
Daniel Benjamin Fyenbo, Anders Sommer, J Tobias Kühl, Klaus F Kofoed, Bjarne L Nørgaard, Mads B Kronborg, Kirsten Bouchelouche, Jens C Nielsen
OBJECTIVES: Before cardiac resynchronization therapy (CRT) implantation, cardiac computed tomography (CT) can provide assessment of cardiac venous anatomy and visualize left ventricular (LV) myocardial scar. We hypothesized that localization and burden of transmural myocardial scar verified by cardiac CT are associated with echocardiographic and clinical response to CRT. METHODS: We prospectively included 140 CRT recipients undergoing preimplant cardiac CT. We assessed transmural scar, defined as hypoperfusion involving more than one-half of the myocardial wall in each LV segment using a 17-segment model...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407246/phase-contrast-magnetic-resonance-quantification-of-aortic-regurgitation-in-patients-with-turbulent-aortic-flow
#4
Elizabeth Lee, Blair Richards, Jimmy C Lu, Maryam Ghadimi Mahani, Adam L Dorfman, Sowmya Balasubramanian, Prachi P Agarwal
OBJECTIVE: This study aimed to assess variability in measurements and accurately quantify aortic regurgitation in patients with coexisting turbulent aortic flow using phase-contrast magnetic resonance. METHODS: All patients (n = 21) underwent phase-contrast magnetic resonance at 2 or more sites: ascending aorta, sinuses of Valsalva, and left ventricular outflow tract. The net flow/minute (NF), forward flow/minute (FF), regurgitant flow/minute (RF), and regurgitant fraction (RF%) were compared with the sum of superior vena cava and descending aortic flow/minute, left ventricular cardiac output, difference between the 2, and percentage difference, respectively...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407245/mixed-imaging-on-port-venous-phase-of-contrast-enhanced-dual-source-dual-energy-computed-tomography-a-measurement-method-based-on-couinaud-segments
#5
Changqin Jiang, Lianfang Shen, Lichao Xia, Shihang Sun, Wei Fang, Qiang Feng, Haixia Dong, Zhijun Ma
OBJECTIVE: The aim of this study was to evaluate the changes of the iodine value quantified on the Couinaud segments measured in port-venous phase using the iodine-mixed technique of contrast-enhanced dual-source dual-energy computed tomography (CT) scanning in different Child-Pugh stages of hepatitis B-induced liver cirrhosis. METHODS: Patients clinically diagnosed with hepatitis B-induced cirrhosis were prospectively engaged in our study. Each patient underwent multiphase iodine agent contrast-enhanced dual-source dual-energy CT scanning, and then the iodine-mixed imaging of port-venous phase was postprocessed...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407244/assessment-of-liver-and-spleen-in-children-with-gaucher-disease-type-1-with-chemical-shift-imaging
#6
Ahmed Abdel Khalek Abdel Razek, Tarik Barakat, Khadiga Ali
PURPOSE: The aim of this study was to assess of liver and spleen in children with Gaucher disease type 1 with chemical shift imaging. METHODS: Retrospective analysis was conducted on 36 untreated children with Gaucher disease type 1 and 15 age- and sex-matched control children who underwent chemical shift imaging of the abdomen. The hepatic and splenic fat fraction was calculated. The Pediatric Gaucher Severity Scoring System, hematologic parameters, and enzyme assay of the disease were calculated and correlated with hepatic and splenic fat fraction...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407243/updated-imaging-features-of-dysplastic-cerebellar-gangliocytoma
#7
Radhika Dhamija, Christopher P Wood, Alyx B Porter, Leland S Hu, Steven M Weindling, Joseph M Hoxworth
OBJECTIVE: The aim of this study was to perform an updated review of the imaging features of dysplastic cerebellar gangliocytoma (DCG). METHODS: Imaging findings were retrospectively reviewed in 14 patients with DCG. The analysis included size, location, cyst formation, calcification, intralesional hemorrhage, enhancement pattern, and apparent diffusion coefficient (ADC). RESULTS: In addition to revisiting many well-established imaging features of DCG, enhancement was much more common (64...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407242/assessment-of-mass-effect-sign-at-high-resolution-computed-tomography-in-prediction-of-cholesteatoma
#8
Omneya A Gamaleldin, Nermine A Elsebaie, Mohamed Hossameldin Khalifa, Ahmed Abdel Khalek Abdel Razek, Ahmed Mohamed Mehanna, Gihan Mohamed Shehata
OBJECTIVE: The aim of this study was to assess the accuracy of mass effect sign in the diagnosis of cholesteatoma at high-resolution computed tomography (HRCT). METHODS: This prospective study included 32 ears in 24 patients with chronic otitis media who underwent HRCT of the temporal bone. Otoscopic and operative notes were recorded. Image analysis was done both qualitatively and quantitatively. In the qualitative analysis, mass effect was evaluated visually by comparing both ears together in 4 certain anatomical sites...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407241/diagnostic-value-of-quantitative-perfusion-computed-tomography-technique-in-the-assessment-of-tumor-response-to-sorafenib-in-patients-with-advanced-hepatocellular-carcinoma
#9
Davide Ippolito, Giulia Querques, Anna Pecorelli, Cammillo Talei Franzesi, Stefano Okolicsanyi, Mario Strazzabosco, Sandro Sironi
AIM: The aim of this study was to assess the role of dynamic contrast-enhanced perfusion computed tomography (pCT) imaging in the early detection of blood flow changes related to antiangiogenic treatment with sorafenib, in patients with advanced hepatocellular carcinoma (HCC), being the modified Response Evaluation Criteria in Solid Tumors (mRECIST) criteria the standard of reference. METHODS: Between 2012 and 2016, 43 cirrhotic patients (male, n = 39; female, n = 4) with biopsy-proven multifocal HCC underwent multi-detector-row computed tomography, and pCT examinations were performed before and every 2 months after sorafenib administration...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407240/adaptive-nonlocal-means-method-for-denoising-basis-material-images-from-dual-energy-computed-tomography
#10
Yuan Yuan, Yanbo Zhang, Hengyong Yu
We propose an adaptive nonlocal means approach for image-domain material decomposition in low-dose dual-energy micro-computed tomography. The key idea is to create a distribution map for decomposition error and assign a smooth weight for a given pixel. This method is applied to the decomposed images of 3 basis materials: bone, soft tissue, and gold in our applications. We assume that bone and gold cannot coexist in the same pixel and regroup these basis materials into 2 categories. For soft tissue, the proposed algorithm is implemented in a noniterative mode...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30407239/dual-source-dual-energy-ct-portal-venous-phase-abdominal-ct-scans-in-large-body-habitus-patients-preliminary-observations-on-image-quality-and-material-decomposition
#11
Vinit Baliyan, Hamed Kordbacheh, Jessica Serrao, Dushyant V Sahani, Avinash R Kambadakone
PURPOSE: Our objective was to evaluate image quality (IQ) and material decomposition in patients with large body habitus undergoing portal venous phase abdominal computed tomography (CT) scans on dual-source dual-energy CT (dsDECT) scanners. METHODS: This retrospective analysis included 30 scans from consecutive patients (19 males/11 females, mean ± SD age = 55.3 ± 17.5 years, range = 27-87 years) with large body habitus (≥90 kg, mean ± SD weight = 105.4 ± 12...
November 6, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371624/spectral-computed-tomography-for-the-quantitative-assessment-of-patients-with-carcinoma-of-the-gastroesophageal-junction-initial-differentiation-between-a-diagnosis-of-squamous-cell-carcinoma-and-adenocarcinoma
#12
Yue Zhou, Ping Hou, Kaiji Zha, Dan Liu, Feng Wang, Kun Zhou, Jianbo Gao
OBJECTIVE: This study aimed to distinguish between esophageal squamous cell carcinoma (ESCC) and esophageal adenocarcinoma (EAC) using spectral computed tomography (CT) and to discuss the accuracy according to an optimal threshold of single and combined parameters. METHODS: In this monoinstitution study, 61 patients, 35 of whom had ESCC and 26 had EAC confirmed by surgery or esophagoscopy, were recruited from August 2016 to March 2017. Enrolled patients underwent dual-phase chest CT enhancement...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371623/conventional-magnetic-resonance-features-for-predicting-1p19q-codeletion-status-of-world-health-organization-grade-ii-and-iii-diffuse-gliomas
#13
Xiaorong Peng, Chen Yishuang, Zhan Kaizhou, Liqun Xiao, Chunnong Ma
PURPOSE: The conventional magnetic resonance features of World Health Organization (WHO) grade II and III diffuse gliomas in relation to chromosome 1p and 19q deletions (1p19q codeletion) were analyzed. METHODS: We identified 147 cases of WHO grade II and III diffuse gliomas (1p/19q codeletion, 36 cases; no 1p/19q codeletion, 111 cases). χ Test and univariate and multivariate binary logistic regression analyses were conducted to evaluate the association between the imaging features and 1p19q codeletion status of WHO grade II and III diffuse gliomas in the discovery group, including the WHO grade II and III subgroups...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371622/assessment-of-dural-ectasia-using-computed-tomodensitometry-as-a-criterion-in-marfan-syndrome
#14
Quentin Chuzel, Sophie Dupuis-Girod, Matthieu Rousset, Charlotte Decharry, Evelyne Decullier, Jean-Baptiste Pialat
OBJECTIVE: The aim of this study was to reevaluate dural ectasia criteria in Marfan syndrome patients fulfilling the revised Ghent criteria. METHODS: Lumbar computed tomography scans of 19 Marfan patients and 30 matched control subjects were retrospectively assessed. Dural sac ratio (DSR), nerve root sleeve diameter, pedicle width, and a scalloping or meningocele presence were each assessed by 2 readers blinded from the diagnosis. Mann-Whitney-Wilcoxon tests compared the patient and control groups...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371621/pancreatic-lymphangioma-a-case-report-and-literature-review
#15
Jay Karajgikar, Sandeep Deshmukh
We report a case of a 29-year-old woman with a pancreatic lymphangioma who presented clinically as a case of acute pancreatitis. Lymphangiomas are benign tumors of vascular origin with lymphatic differentiation, most commonly found in the head and neck. Pancreatic lymphangiomas are extremely rare, accounting for only 1% of abdominal lymphangiomas, with approximately 60 cases reported in the literature. Although imaging findings are characteristic and can point to the diagnosis, confirmation with fine needle aspiration and histopathologic correlation is necessary...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371620/quantitative-dual-energy-computed-tomography-predicts-regional-perfusion-heterogeneity-in-a-model-of-acute-lung-injury
#16
Fernando Uliana Kay, Marcelo A Beraldo, Maria A M Nakamura, Roberta De Santis Santiago, Vinicius Torsani, Susimeire Gomes, Rollin Roldan, Mauro R Tucci, Suhny Abbara, Marcelo B P Amato, Edson Amaro
OBJECTIVE: The aims of this study were to investigate the ability of contrast-enhanced dual-energy computed tomography (DECT) for assessing regional perfusion in a model of acute lung injury, using dynamic first-pass perfusion CT (DynCT) as the criterion standard and to evaluate if changes in lung perfusion caused by prone ventilation are similarly demonstrated by DECT and DynCT. METHODS: This was an institutional review board-approved study, compliant with guidelines for humane care of laboratory animals...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371619/effect-of-virtual-monoenergetic-images-from-spectral-detector-computed-tomography-on-coronary-calcium-blooming
#17
Steven Van Hedent, Nils Große Hokamp, Rivka Kessner, Robert Gilkeson, Pablo R Ros, Amit Gupta
OBJECTIVE: The aim of this study was to investigate the quantitative and qualitative effects of virtual monoenergetic images (VMI) by spectral detector computed tomography (SDCT) on calcium blooming in coronary computed tomography angiography. METHODS: Coronary computed tomography angiography using SDCT was performed on 42 patients with coronary artery calcifications. Stenosis grading by diameter and area of calcified plaques and free lumen using VMI from 70 to 140 keV was performed and compared with measurements by conventional images...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371618/iron-containing-abdominal-pathologies-exploiting-magnetic-susceptibility-artifact-on-dual-echo-gradient-echo-magnetic-resonance-imaging
#18
Aaron J Thomas, Ajaykumar C Morani, Peter S Liu, William J Weadock, Hero K Hussain, Khaled M Elsayes
A multitude of pathologic entities involve abnormal iron deposition in the abdomen. These lesions demonstrate decreased signal on longer magnetic resonance sequences with longer echo time due to T2* effect. Dual-echo gradient-echo sequences demonstrate increased susceptibility artifact with longer echo sequences. In this article, the spectrum of iron-containing abdominal pathologies is illustrated, with their characteristic distributions. Included is a brief discussion of the physics of magnetic resonance imaging of iron-containing lesions...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371617/how-to-incorporate-dual-energy-computed-tomography-into-your-neuroradiology-practice-questions-and-answers
#19
Jeffrey R Sachs, Thomas G West, Christopher M Lack, Brad Perry, Michael E Zapadka
Dual-energy computed tomography (DECT) has many current and evolving applications in neuroradiology including material decomposition, improving conspicuity of iodinated contrast enhancement, and artifact reduction. However, there are multiple challenges in incorporating DECT into practice including hardware selection, postprocessing software requirements, technologist and physician training, and numerous workflow issues. This article reviews in a question-and-answer format common issues that arise when incorporating DECT into a busy neuroradiology practice...
October 26, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/30371616/efficacy-of-the-rotational-traction-method-in-the-assessment-of-glenohumeral-cartilage-surface-area-in-computed-tomography-arthrography
#20
Gökhan Polat, Hayri Oğul, Ahmet Yalçin, Kutsi Tuncer, Serhat Kaya, Berhan Pirimoğlu, Recep Sade, Mecit Kantarci
OBJECTIVE: We aimed to investigate the efficacy of the rotational traction method in expanding the joint space and enabling the assessment of an extended surface area. METHODS: Sixty patients who underwent computed tomography arthrography were evaluated in the study: 30 with and 30 without the help of rotational traction. The subgroups consisted of patients with adhesive capsulitis, habitual luxation, or labral tears. Areas of obscured joint surface by coalescent cartilages were calculated using computer software, and those belonging to the traction and nontraction groups along with subgroups were compared statistically...
October 26, 2018: Journal of Computer Assisted Tomography
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