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https://www.readbyqxmd.com/read/29220212/comparison-of-xenon-enhanced-area-detector-ct-and-krypton-ventilation-spect-ct-for-assessment-of-pulmonary-functional-loss-and-disease-severity-in-smokers
#1
Yoshiharu Ohno, Yasuko Fujisawa, Daisuke Takenaka, Shigeo Kaminaga, Shinichiro Seki, Naoki Sugihara, Takeshi Yoshikawa
OBJECTIVE: The objective of this study was to compare the capability of xenon-enhanced area-detector CT (ADCT) performed with a subtraction technique and coregistered 81mKr-ventilation SPECT/CT for the assessment of pulmonary functional loss and disease severity in smokers. SUBJECTS AND METHODS: Forty-six consecutive smokers (32 men and 14 women; mean age, 67.0 years) underwent prospective unenhanced and xenon-enhanced ADCT, 81mKr-ventilation SPECT/CT, and pulmonary function tests...
December 8, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29207802/image-findings-of-solid-pseudopapillary-neoplasms-of-the-pancreas-on-multiphasic-multidetector-ct-scan-a-single-institute-experience-from-southern-india
#2
Santosh Rai, Sonali Prabhu, Sharada Rai, Murali Nirupama, Deepa Sa Adiga, Ashvini Kumar, Shrijeet Chakraborti
Introduction: Solid Pseudopapillary Neoplasms (SPN) are uncommon pancreatic tumours and are slow growing with uncertain malignant potential, showing female preponderance. Postoperative prognosis is good and metastasis is rare. Aim: To summarise the imaging and pathological features of seven cases of SPN in three years period, from January 2013 to January 2016. Materials and Methods: In this retrospective study the imaging features of seven cases on triphasic multidetector Computed Tomogram (CT), a 16-slice scanner, were reviewed along with CT-guided Fine Needle Aspiration Cytology (FNAC) and histopathological examination...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29166148/in-vivo-differentiation-of-uric-acid-versus-non-uric-acid-urinary-calculi-with-third-generation-dual-source-dual-energy-ct-at-reduced-radiation-dose
#3
Axelle Franken, Pierre Alain Gevenois, Alain Van Muylem, Nigel Howarth, Caroline Keyzer
OBJECTIVE: The objective of our study was to evaluate in vivo urinary calculus characterization with third-generation dual-source dual-energy CT (DECT) at reduced versus standard radiation dose. SUBJECTS AND METHODS: One hundred fifty-three patients requiring unenhanced CT for suspected or known urolithiasis were prospectively included in our study. They underwent two acquisitions at reduced-dose CT (90 kV and 50 mAsref; Sn150 kV and 31 mAsref, where Sn denotes the interposition of a tin filter in the high-energy beam) and standard-dose CT (90 kV and 50 mAsref; Sn150 kV and 94 mAsref)...
November 22, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29140115/ultrasound-unenhanced-ct-fusion-for-detection-and-localization-of-ureteral-stones
#4
Eyal Bercovich, Maxim Leiderman, Nira Beck-Razi, Diana Gaitini, Marcia Javitt
OBJECTIVE: The standard of care for the diagnosis and follow-up of urolithiasis is unenhanced CT. The hypothesis of this study was that that by using image fusion of subsequent ultrasound (US) with the initial unenhanced CT, ureteral stones can be precisely localized. CONCLUSION: Of the 25 stones founds on unenhanced CT studies, 22 (88%) were confidently identified using US-unenhanced CT fusion within 72 hours after the initial CT scan was obtained. US-unenhanced CT fusion might obviate the need for repeated CT scans for monitoring urolithiasis...
November 15, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29128991/renal-cancer-at-unenhanced-ct-imaging-features-detection-rates-and-outcomes
#5
Stacy D O'Connor, Stuart G Silverman, Laila R Cochon, Ramin K Khorasani
PURPOSE: To describe and quantify the rate of detection of renal cancer on unenhanced CT. METHODS: This retrospective, HIPAA-compliant study was approved by the Institutional Review Board. Electronic health records for all patients who underwent unenhanced abdominal CT at our institution between 2000 and 2005 were reviewed to identify patients subsequently diagnosed with renal cancer during a follow-up period of up to 12 years. Images were reviewed to determine if the cancer was visible at index (first) unenhanced CT and their findings recorded...
November 11, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/29119531/the-non-operative-management-of-asymptomatic-liver-hydatids-ending-echinococcophobia
#6
Farrokh Saidi, Farrokh Habibzadeh
BACKGROUND: Cystic echinococcosis is common in many countries and involves the liver in 75% of cases. The current belief is that all incidentally discovered asymptomatic liver hydatids must be subjected to some types of interventional treatments pre-emptively for fear of some presumably impending complications. We conducted this study to assess the prognosis of patients with liver hydatids without any surgical interventions. Furthermore, we tried to predict the outcome of the cyst using two radiological signs...
November 8, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/29104652/plain-and-contrast-enhanced-chest-computed-tomography-scan-findings-of-pulmonary-cryptococcosis-in-immunocompetent-patients
#7
Rongshui Yang, Yan Yan, Yuhuan Wang, Xiaohuan Liu, Xinhui Su
Pulmonary cryptococcosis is most commonly reported in immunocompromised patients, whereas immunocompetent hosts are rarely affected and may be asymptomatic, resulting in reduced diagnostic performance of computed tomography (CT) imaging. Thus, the aim of the present study was to review the plain and contrast-enhanced chest CT scan findings of primary pulmonary cryptococcosis in immunocompetent patients, with the aim of improving the diagnosis of this type of pulmonary disease. In the present study, a total of 27 immunocompetent patients of clinically confirmed pulmonary cryptococcosis were analyzed retrospectively...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29091751/interreader-reliability-of-li-rads-version-2014-algorithm-and-imaging-features-for-diagnosis-of-hepatocellular-carcinoma-a-large-international-multireader-study
#8
Kathryn J Fowler, An Tang, Cynthia Santillan, Mythreyi Bhargavan-Chatfield, Jay Heiken, Reena C Jha, Jeffrey Weinreb, Hero Hussain, Donald G Mitchell, Mustafa R Bashir, Eduardo A C Costa, Guilherme M Cunha, Laura Coombs, Tanya Wolfson, Anthony C Gamst, Giuseppe Brancatelli, Benjamin Yeh, Claude B Sirlin
Purpose To determine in a large multicenter multireader setting the interreader reliability of Liver Imaging Reporting and Data System (LI-RADS) version 2014 categories, the major imaging features seen with computed tomography (CT) and magnetic resonance (MR) imaging, and the potential effect of reader demographics on agreement with a preselected nonconsecutive image set. Materials and Methods Institutional review board approval was obtained, and patient consent was waived for this retrospective study. Ten image sets, comprising 38-40 unique studies (equal number of CT and MR imaging studies, uniformly distributed LI-RADS categories), were randomly allocated to readers...
November 1, 2017: Radiology
https://www.readbyqxmd.com/read/29076752/contrast-enhancement-in-abdominal-computed-tomography-influence-of-photon-energy-of-different-scanners
#9
Narumi Taguchi, Seitaro Oda, Takeshi Nakaura, Daisuke Utsunomiya, Yoshinori Funama, Masanori Imuta, Hideaki Yuki, Yasunori Nagayama, Masafumi Kidoh, Kenichiro Hirata, Yuji Iyama, Tomohiro Namimoto, Noriyuki Kai, Masahiro Hatemura, Yasuyuki Yamashita
OBJECTIVE: Different CT scanners have different X-ray spectra and photon energies, indicating that contrast enhancement vary among scanners. However, this issue has not been fully validated; therefore, we performed phantom and clinical studies to assess this difference. METHODS: Two scanners were used: scanner-A and scanner-B. In the phantom study, we compared the contrast enhancement between the scanners at tube voltage peaks of 80, 100 and 120 kVp. Then, we calculated the effective energies of the two CT scanners...
October 27, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29068976/diagnostic-value-of-contrast-enhanced-ct-scans-in-identifying-lung-adenocarcinomas-manifesting-as-ggns-ground-glass-nodules
#10
Feng Gao, Ming Li, Yingli Sun, Li Xiao, Yanqing Hua
This study aimed to explore the value of contrast-enhanced computed tomography (CT) scans in the differential diagnosis of atypical adenomatous hyperplasia, adenocarcinoma in situ, minimal invasive adenocarcinoma (MIA), and invasive adenocarcinoma (IAC), which manifested as ground glass nodules (GGNs) or mixed GGNs.Unenhanced and contrast-enhanced presurgical CT images of 136 cases of GGNs were compared. The nodules were diagnosed based on their solid portions and maximum dimensions, and the findings obtained using both contrast-enhanced and unenhanced CT images were analyzed in corroboration with the pathological diagnosis...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29064752/improving-clinical-information-on-head-ct-requisitions-from-the-emergency-department-to-aid-interpretation-and-billing-efficiency
#11
Dillon Barron, Thomas Spiegel, Gregory L Katzman, Kateland Haas, Saad Ali
OBJECTIVE: The accuracy of radiologic interpretations is higher when appropriate clinical information is provided, as is the likelihood of reimbursement for the studies. The purpose of this project was to evaluate and improve the quality of clinical information provided on head CT requisitions from an urban emergency department (ED). SUBJECTS AND METHODS: In a prospective study conducted from July 2015 to May 2016, attending neuroradiologists evaluated 1100 randomly selected ED requisitions for unenhanced head CT, grading them for clinical and billing adequacy on a scale of 0-2...
October 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29055683/spectral-beam-shaping-in-unenhanced-chest-ct-examinations-a-phantom-study-on-dose-reduction-and-image-quality
#12
Saravanabavaan Suntharalingam, Thomas Allmendinger, Sebastian Blex, Mohammad Al-Bayati, Kai Nassenstein, Bernd Schweiger, Michael Forsting, Axel Wetter
RATIONALE AND OBJECTIVES: This study aimed to determine the optimal tube potential for unenhanced chest computed tomographies (CTs) with age-related phantoms. MATERIALS AND METHODS: Three physical anthropomorphic phantoms (newborn, 5-year-old child, and adult) were scanned on a third-generation dual-source CT using CAREkV in semi-mode and CAREDose4D (ref. KV: 120; ref. mAs 50). Scans were performed with all available tube potentials (70-150 kV and Sn150 kV). The lowest volume computed tomography dose index (CTDIvol) was selected to perform additional Sn100-kV scans with matched and half (Sn100-half) CTDIvol value...
October 18, 2017: Academic Radiology
https://www.readbyqxmd.com/read/29045176/computer-aided-diagnosis-of-ground-glass-opacity-nodules-using-open-source-software-for-quantifying-tumor-heterogeneity
#13
Ming Li, Vivek Narayan, Ritu R Gill, Jyothi P Jagannathan, Maria F Barile, Feng Gao, Raphael Bueno, Jagadeesan Jayender
OBJECTIVE: The purposes of this study are to develop quantitative imaging biomarkers obtained from high-resolution CTs for classifying ground-glass nodules (GGNs) into atypical adenomatous hyperplasia (AAH), adenocarcinoma in situ (AIS), minimally invasive adenocarcinoma (MIA), and invasive adenocarcinoma (IAC); to evaluate the utility of contrast enhancement for differential diagnosis; and to develop and validate a support vector machine (SVM) to predict the GGN type. MATERIALS AND METHODS: The heterogeneity of 248 GGNs was quantified using custom software...
December 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29040038/ferumoxytol-enhanced-mr-angiography-for-vascular-access-mapping-before-transcatheter-aortic-valve-replacement-in-patients-with-renal-impairment-a-step-toward-patient-specific-care
#14
Kim-Lien Nguyen, John M Moriarty, Adam N Plotnik, Olcay Aksoy, Takegawa Yoshida, Richard J Shemin, William M Suh, J Paul Finn
Purpose To assess the technical feasibility of the use of ferumoxytol-enhanced (FE) magnetic resonance (MR) angiography for vascular mapping before transcatheter aortic valve replacement in patients with renal impairment. Materials and Methods This was an institutional review board-approved and HIPAA-compliant study. FE MR angiography was performed at 3.0 T or 1.5 T. Unenhanced computed tomographic (CT) images were used to overlay vascular calcification on FE MR angiographic images as composite fused three-dimensional data...
October 16, 2017: Radiology
https://www.readbyqxmd.com/read/29037128/predictive-value-of-secondary-signs-of-obstruction-in-follow-up-computed-tomography-of-ureteral-stones-a-study-with-dynamic-computed-tomography
#15
Klara Sahlén, Pär Dahlman, Einar Brekkan, Maria Lönnemark, Göran Sahlén, Monica Segelsjö, Anders Magnusson
OBJECTIVES: This study aimed to determine the ratio of obstruction and predictive values of secondary signs in follow-up computed tomography (CT) of ureterolithiasis patients; to correlate stone characteristics with obstruction; to compare enhancement of obstructed and non-obstructed kidneys; and to compare radiation dose of the dynamic CT protocol to an excretory-phase protocol. MATERIALS AND METHODS: This retrospective study assessed 49 follow-up CT scans of patients with remaining ureterolithiasis after a renal colic episode...
October 16, 2017: Scandinavian Journal of Urology
https://www.readbyqxmd.com/read/29033392/mechanical-recanalization-in-ischemic-anterior-circulation-stroke-within-an-8-hour-time-window-a-real-world-experience
#16
Dagmar Krajíčková, Antonín Krajina, Roman Herzig, Miroslav Lojík, Vendelín Chovanec, Jan Raupach, Eva Vítková, Jan Waishaupt, Oldřich Vyšata, Martin Vališ
PURPOSE: We aimed to assess the safety and effectiveness of mechanical recanalization in patients with ischemic stroke in the anterior circulation within 8 h since symptoms onset and with unknown onset time. We compared time intervals <6 h vs. 6-8 h/unknown onset time, as only limited data are available for a time window beyond 6 h. METHODS: Our cohort included 110 consecutive patients (44 males; mean age, 73.0±11.5 years) with ischemic stroke in the anterior circulation due to the acute occlusion of a large intracranial artery who underwent mechanical recanalization within an 8-hour time window or with unknown onset time...
November 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28986556/clinical-implication-of-ectopic-liver-lipid-accumulation-in-renal-cell-carcinoma-patients-without-visceral-obesity
#17
Daisuke Watanabe, Akio Horiguchi, Shinsuke Tasaki, Kenji Kuroda, Akinori Sato, Junichi Asakuma, Keiichi Ito, Tomohiko Asano, Hiroshi Shinmoto
Fatty liver has emerged as a prognostic marker of cancer, so we investigated the impact of ectopic lipid accumulation in liver on the clinical outcome for patients with renal cell carcinoma (RCC). The records of 230 consecutive patients who had undergone surgery for RCC were reviewed, and liver lipid accumulation was estimated from the attenuation in unenhanced preoperative CT images. The median liver CT values of patients with G3 tumors was lower than that of patients with G1-2 tumors (P = 0.0116), that of patients with pT3-4 tumors was lower than that of patients with pT1-2 tumors (P = 0...
October 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28984778/diagnostic-value-of-using-multiplanar-reformation-images-case-report-for-rare-endotracheal-hamartomas
#18
Zhiming Xiang, Zhu Ai, Guimian Zhong, Yu Deng, Harshawn Malhi, Suzanne Palmer, Chishing Zee
RATIONALE: Pulmonary hamartomas are the most common benign tumor of the lung. Two types of pathologically similar hamartomas exist based on their location. These tumors have a low incidence, are rarely reported and frequently misdiagnosed because of lack of familiarity and/or understanding concerning their imaging features. PATIENT CONCERNS: Seventeen patients received treatment between June 2007 and May 2013 and had complete medical records. All of them had different degrees of cough and expectoration...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28969853/texture-analysis-of-ct-images-in-predicting-malignancy-risk-of-gastrointestinal-stromal-tumours
#19
S Liu, X Pan, R Liu, H Zheng, L Chen, W Guan, H Wang, Y Sun, L Tang, Y Guan, Y Ge, J He, Z Zhou
AIM: To explore the role of texture analysis of computed tomography (CT) images in predicting the malignancy risk of gastrointestinal stromal tumours (GISTs). MATERIALS AND METHODS: Seventy-eight patients with histopathologically confirmed GISTs underwent preoperative CT. Texture analysis was performed on unenhanced and contrast-enhanced CT images, respectively. Fourteen CT texture parameters were obtained and compared among GISTs at different malignancy risks with one-way analysis of variance or independent-samples Kruskal-Wallis test...
September 29, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28958720/dual-energy-ct-of-the-abdomen-and-pelvis-radiation-dose-considerations
#20
Joseph R Grajo, Dushyant V Sahani
Dual-energy CT offers several new applications and opportunities for routine clinical practice. Increasing utilization in the context of both routine practice and clinical research raises questions about expected radiation dose when compared with conventional single-energy exams. Despite initial concerns, advanced iterative reconstruction techniques and creation of virtual unenhanced images in multiphase acquisitions offer methods for dose reduction. Although dose varies across patients and scanners, modern dual-energy exams allow for comparable and potentially decreased radiation dose when compared with single-energy CT...
September 21, 2017: Journal of the American College of Radiology: JACR
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