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Journal of Computer Assisted Tomography

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https://www.readbyqxmd.com/read/29287026/presence-of-intratumoral-calcifications-and-vasculature-is-associated-with-poor-overall-survival-in-clear-cell-renal-cell-carcinoma
#1
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
https://www.readbyqxmd.com/read/29287025/2-hydroxyglutarate-detection-by-short-echo-time-magnetic-resonance-spectroscopy-in-routine-imaging-study-of-brain-glioma-at-3-0-t
#2
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
https://www.readbyqxmd.com/read/29287024/low-dose-noncontrast-examination-of-the-paranasal-sinuses-using-volumetric-computed-tomography
#3
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
https://www.readbyqxmd.com/read/29287023/single-shot-version-of-flair-sequence-in-the-detection-of-intraventricular-anomalies-preliminary-experience-in-fetal-mr-imaging
#4
Giorgia Falanga, Marco Moscatelli, Giana Izzo, Cecilia Parazzini, Chiara Doneda, Andrea Righini
OBJECTIVE: To evaluate single-shot (ss) FLAIR sequence in the detection of intraventricular anomalies in a series of fetuses showing mild-moderate ventriculomegaly at ultrasound. SUBJECTS AND METHODS: Fetuses with mild-moderate isolated ventriculomegaly, which underwent MR imaging between 2003 and 2014 were considered eligible. Fetuses were examined by standard MR protocol and ss-FLAIR sequence, tailored for snapshot imaging. Two paediatric neuroradiologists evaluated MR images...
December 28, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29287022/inflammatory-pseudotumor-like-follicular-dendritic-cell-sarcoma-of-the-spleen-computed-tomography-imaging-characteristics-in-5-patients
#5
Xiumei Li, Zhenshan Shi, Ruixiong You, Yueming Li, Dairong Cao, Renjie Lin, Xinming Huang
OBJECTIVES: The purpose of this study was to retrospectively review the computed tomography (CT) and clinicopathological characteristics of inflammatory pseudotumor (IPT)-like follicular dendritic cell sarcoma (FDCS) of the spleen in 5 patients. METHODS: Clinical, pathologic, and CT imaging findings of 5 patients with IPT-like FDCS of the spleen were reviewed and analyzed. Computed tomography imaging and pathologic features were compared. RESULTS: Abdominal unenhanced CT revealed a well-defined hypodense mass in the spleen with complex internal architecture with focal necrosis and/or speckle-strip calcification...
December 28, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29287021/does-computed-tomography-have-the-ability-to-differentiate-aggressive-from-nonaggressive-solid-pseudopapillary-neoplasm
#6
Ashita Rastogi, Mathew Assing, Mellisa Taggart, Brinda Rao, Jia Sun, Khaled Elsayes, Eric Tamm, Priya Bhosale
OBJECTIVE: The aim of the study was to assess the ability of contrast-enhanced computed tomography (CECT) to differentiate aggressive from nonaggressive solid pseudopapillary neoplasms (SPNs). MATERIALS AND METHODS: Forty treatment-naive patients with pathologically proven pancreatic SPNs were included. Imaging characteristics were determined by consensus of 3 radiologists blinded to histopathologic aggressiveness. All patients underwent 4-phase CECT using a pancreatic protocol...
December 28, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29287020/state-of-the-art-diagnosis-and-treatment-of-melanoma-optimal-multidetector-computed-tomographic-practice-to-identify-metastatic-disease-and-review-of-innovative-therapeutic-agents
#7
Blake C Jones, Evan J Lipson, Brandon Childers, Elliot K Fishman, Pamela T Johnson
The incidence of melanoma has risen dramatically over the past several decades. Oncologists rely on the ability of radiologists to identify subtle radiographic changes representing metastatic and recurrent melanoma in uncommon locations on multidetector computed tomography (MDCT) as the front-line imaging surveillance tool. To accomplish this goal, MDCT acquisition and display must be optimized and radiologist interpretation and search patterns must be tailored to identify the unique and often subtle metastatic lesions of melanoma...
December 28, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29287019/preliminary-results-of-high-precision-computed-diffusion-weighted-imaging-for-the-diagnosis-of-hepatocellular-carcinoma-at-3-tesla
#8
Motonori Akagi, Yuko Nakamura, Toru Higaki, Yoshiko Matsubara, Hiroaki Terada, Yukiko Honda, Fuminari Tatsugami, Yasutaka Baba, Makoto Iida, Kazuo Awai
OBJECTIVE: To compare the utility of high-precision computed diffusion-weighted imaging (hc-DWI) and conventional computed DWI (cc-DWI) for the diagnosis of hepatocellular carcinoma (HCC) at 3 T. METHODS: We subjected 75 HCC patients to DWI (b-value 150 and 600 s/mm). To generate hc-DWI we applied non-rigid image registration to avoid the mis-registration of images obtained with different b-values. We defined c-DWI with a b-value of 1500 s/mm using DWI with b-value 150 and 600 s/mm as cc-DWI, and c-DWI with b-value 1500 s/mm using registered DWI with b-value 150 and 600 s/mm as hc-DWI...
December 28, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29251647/pretreatment-18f-fluorodeoxyglucose-positron-emission-tomography-standardized-uptake-values-and-tumor-size-in-medically-inoperable-nonsmall-cell-lung-cancer-is-prognostic-of-overall-2-year-survival-after-stereotactic-body-radiation-therapy
#9
Madison R Kocher, Anand Sharma, Elizabeth Garrett-Mayer, James G Ravenel
OBJECTIVE: The aim of this study was to determine prognostic value of tumor size and metabolic activity on survival for patients with early stage nonsmall cell lung cancer receiving stereotactic body radiation therapy. METHODS: We retrospectively evaluated the patients who underwent positron emission tomography-computed tomography scan before stereotactic body radiation therapy treatment. Tumor diameter, tumor volume, maximum standardized uptake value (SUVmax), standardized uptake value (SUV) average, and SUV volume were obtained...
December 14, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29215545/metal-artifact-free-and-dose-efficient-computed-tomography-imaging-of-a-cardiac-prosthetic-valve-using-spectral-shaping-of-the-x-ray-beam-a-case-report
#10
Christoph Schabel, Nishant K Sekaran, Andrew Wang, Lynne Hurwitz
Bioprosthetic valve (BPV) thrombosis can be challenging to diagnose with cardiac computed tomography owing to metal artifacts of the BPV. In this case report, an optimized metal artifact reduction protocol using a third-generation dual-source multidetector computed tomographic scanner with high kVp (Sn150kVp) and tin (Sn) filtration and high temporal resolution yielded high-quality, artifact-free, dynamic images of a thrombosed mitral BPV.
December 5, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189405/intrahepatic-mass-forming-cholangiocarcinoma-relationship-between-computed-tomography-characteristics-and-histological-subtypes
#11
Ju Gang Nam, Jeong Min Lee, Ijin Joo, Su Joa Ahn, Jin Young Park, Kyoung Bun Lee, Joon Koo Han
OBJECTIVE: The aim of this study was to determine the value of multi-detector row computed tomography (MDCT) in differentiating the small-duct (SD) and large-duct (LD) types of intrahepatic mass-forming cholangiocarcinomas (IMCCs) and predicting patient prognosis. METHODS: The 4-phase MDCT image findings of 82 patients with surgically confirmed IMCCs (60 SD-type and 22 LD-type IMCCs) were compared between 2 types using univariate and multivariate analyses. Overall survival rates for 78 patients with available information were compared using the Kaplan-Meier method...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189404/artifactual-appearance-of-thrombosis-on-using-metal-artifact-reduction-software-reconstruction-in-computed-tomographic-angiography
#12
Richard Thomas, Ayaz Aghayev, Michael L Steigner
The authors attempted to use metal artifact reduction software in 2 computed tomographic angiogram studies to decrease beam hardening. Although the beam hardening artifacts were reduced in the postprocessed images, there was an artifactual appearance of thrombosis in the adjacent arteries in the first case and in the inflow cannula of a left ventricular assist device in the second case. Comparison of the reconstructed images with the original images is therefore essential to avoid a misdiagnosis.
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189403/how-do-different-indices-of-hepatic-enhancement-with-gadoxetic-acid-compare-in-predicting-liver-failure-and-other-major-complications-after-hepatectomy
#13
Andreu F Costa, Amélie Tremblay St-Germain, Mohamed Abdolell, Rory L Smoot, Sean Cleary, Kartik S Jhaveri
OBJECTIVE: The objective of this study was to assess the accuracy of gadoxetic acid hepatic enhancement indices in predicting posthepatectomy liver failure (PHLF) and other major complications (OMCs). METHODS: Sixty-five patients underwent prehepatectomy gadoxetic acid-enhanced magnetic resonance imaging. Enhancement indices were calculated by obtaining regions of interest on magnetic resonance images and segmented volumes of the liver and spleen. Multivariate regression analysis was performed to predict PHLF and OMC as a function of the indices, and areas under the receiver operator characteristic (AUROC) curves were calculated...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189402/correlation-between-semen-analysis-parameters-and-diffusion-weighted-magnetic-resonance-imaging-of-the-testicles-in-patients-with-varicocele-a-pilot-study
#14
Bülent Çekiç, Koray Kaya Kiliç, Iclal Erdem Toslak, Abdullah Şükun, Semih Sağlik, Murat Savaş, Mert Köroğlu
PURPOSE: The aims of this study were to evaluate using testicle apparent diffusion coefficient (ADC) values in patients with varicocele and compare them with those of healthy individuals, to identify an optimal ADC threshold level to predict abnormal semen analysis using diffusion-weighted imaging. MATERIALS AND METHODS: Thirty-one patients with the diagnosis of varicocele and 20 healthy controls were enrolled in the study. All subjects underwent testicle diffusion-weighted imaging at b values of 0, 400, and 800 s/mm and semen analysis...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189401/comparing-fourth-generation-statistical-iterative-reconstruction-technique-to-standard-filtered-back-projection-in-pediatric-head-computed-tomography-examinations
#15
Anna Kalathil Thomas, Richard Southard, John Curran, Robyn Augustyn
OBJECTIVE: Although advanced statistical iterative reconstruction (IR) techniques are valued in pediatric computed tomography (CT) imaging, there is little published data on how these techniques affect image quality and radiation dose in the pediatric population. This is particularly true in the context of pediatric head CT examinations. This study analyzed the differences in image quality and several standard metrics of radiation dose on multidetector pediatric head CT examinations performed using standard filtered back projection (FBP) with reconstructions using iDose, a fourth-generation statistical iterative reconstruction technique...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189400/assessment-of-myometrial-invasion-in-premenopausal-grade-1-endometrial-carcinoma-is-magnetic-resonance-imaging-a-reliable-tool-in-selecting-patients-for-fertility-preserving-therapy
#16
Makoto Sakane, Masatoshi Hori, Hiromitsu Onishi, Takahiro Tsuboyama, Takashi Ota, Mitsuaki Tatsumi, Yutaka Ueda, Toshihiro Kimura, Tadashi Kimura, Noriyuki Tomiyama
OBJECTIVES: The aim of this study was to evaluate the diagnostic ability of magnetic resonance imaging (MRI) in premenopausal women with G1 endometrial carcinoma. METHODS: Twenty-six patients underwent T2W, diffusion weighted, and dynamic contrast-enhanced 3-T MRI. The degree of myometrial invasion was pathologically classified into no invasion, shallow (3 mm or less), and more. Two radiologists assessed myometrial invasion on MRI. Diagnostic accuracy, sensitivity, specificity, positive and negative predictive values, AUC, and interobserver agreement were analyzed...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189399/performance-of-magnetic-resonance-susceptibility-weighted-imaging-for-detection-of-calcifications-in-patients-with-hepatic-echinococcosis
#17
Jan Mueller, Marija Stojkovic, Hans-Ulrich Kauczor, Thomas Junghanss, Tim Frederik Weber
OBJECTIVE: We evaluated the performance of susceptibility-weighted imaging (SWI) for identification of hepatic calcifications in alveolar echinococcosis and cystic echinococcosis. METHODS: The SWI images of 58 lesions in 40 patients (age, 49 ± 14 y) with alveolar echinococcosis (n = 22) or cystic echinococcosis (n = 18) were reviewed for calcifications. First, calcifications were suggested by visual assessment. Second, ratios of minimum intralesional intensity and mean lumbar muscle intensity were recorded...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189398/quantification-of-the-effect-of-shuttling-on-computed-tomography-perfusion-parameters-by-investigation-of-aortic-inputs-on-different-table-positions-from-shuttle-mode-scans-of-lung-and-liver-tumors
#18
Payel Ghosh, Adam G Chandler, Brian P Hobbs, Jia Sun, John Rong, David Hong, Vivek Subbiah, Filip Janku, Aung Naing, Wen-Jen Hwu, Chaan S Ng
OBJECTIVES: The aim of this study was to quantify the effect of shuttling on computed tomography perfusion (CTp) parameters derived from shuttle-mode body CT images using aortic inputs from different table positions. METHODS: Axial shuttle-mode CT scans were acquired from 6 patients (10 phases, 2 nonoverlapping table positions 1.4 seconds apart) after contrast agent administration. Artifacts resulting from the shuttling motion were corrected with nonrigid registration before computing CTp maps from 4 aortic levels chosen from the most superior and inferior slices of each table position scan...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189397/patterns-of-coronary-calcification-and-their-impact-on-the-diagnostic-accuracy-of-computed-tomography-coronary-angiography
#19
Dariusz Noll, Mariusz Kruk, Marcin Demkow, Jerzy Pręgowski, Edyta Kaczmarska, Karolina Kryczka, Radosław Pracoń, Zofia Dzielińska, Justyna Śleszycka, Adam Witkowski, Witold Rużyłło, Cezary Kępka
OBJECTIVE: Despite coronary calcifications being a major factor affecting the diagnostic accuracy of coronary computed tomography angiography (CTA), there is a lack of established criteria for categorizing calcifications. We aimed to evaluate patterns of coronary calcification based on quantitative radiodensity and size parameters to provide coronary calcium categories and assess their impact on the accuracy of coronary CTA. METHODS AND RESULTS: We analyzed length, maximum thickness, volume, mean density, and maximum density of coronary calcium and divided each of these parameters into tertiles...
November 16, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29189396/computed-tomography-based-texture-analysis-to-determine-human-papillomavirus-status-of-oropharyngeal-squamous-cell-carcinoma
#20
Sara Ranjbar, Shuluo Ning, Christine M Zwart, Christopher P Wood, Steven M Weindling, Teresa Wu, J Ross Mitchell, Jing Li, Joseph M Hoxworth
OBJECTIVE: To determine whether machine learning can accurately classify human papillomavirus (HPV) status of oropharyngeal squamous cell carcinoma (OPSCC) using computed tomography (CT)-based texture analysis. METHODS: Texture analyses were retrospectively applied to regions of interest from OPSCC primary tumors on contrast-enhanced neck CT, and machine learning was used to create a model that classified HPV status with the highest accuracy. Results were compared against the blinded review of 2 neuroradiologists...
November 16, 2017: Journal of Computer Assisted Tomography
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