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https://www.readbyqxmd.com/read/28070657/-how-to-incorporate-dual-energy-imaging-into-a-high-volume-abdominal-imaging-practice
#1
Eric P Tamm, Ott Le, Xinming Liu, Rick R Layman, Dianna D Cody, Priya R Bhosale
Dual-energy CT imaging has many potential uses in abdominal imaging. It also has unique requirements for protocol creation depending on the dual-energy scanning technique that is being utilized. It also generates several new types of images which can increase the complexity of image creation and image interpretation. The purpose of this article is to review, for rapid switching and dual-source dual-energy platforms, methods for creating dual-energy protocols, different approaches for efficiently creating dual-energy images, and an approach to navigating and using dual-energy images at the reading station all using the example of a pancreatic multiphasic protocol...
January 9, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28067202/pulmonary-fibrosis-tissue-characterization-using-late-enhanced-mri-compared-with-unenhanced-anatomic-high-resolution-ct
#2
Lisa P Lavelle, Darragh Brady, Sinead McEvoy, David Murphy, Brian Gibney, Annika Gallagher, Marcus Butler, Fionnula Shortt, Marie McMullen, Aurelie Fabre, David A Lynch, Michael P Keane, Jonathan D Dodd
PURPOSE: We aimed to prospectively evaluate anatomic chest computed tomography (CT) with tissue characterization late gadolinium-enhanced magnetic resonance imaging (MRI) in the evaluation of pulmonary fibrosis (PF). METHODS: Twenty patients with idiopathic pulmonary fibrosis (IPF) and twelve control patients underwent late-enhanced MRI and high-resolution CT. Tissue characterization of PF was depicted using a segmented inversion-recovery turbo low-angle shot MRI sequence...
January 9, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28063406/contemporary-imaging-of-incidentally-discovered-adrenal-masses
#3
REVIEW
Daniel J Wale, Ka Kit Wong, Benjamin L Viglianti, Domenico Rubello, Milton D Gross
Adrenal lesions are routinely encountered incidentally in clinical practice. Although most of these lesions are benign, malignancy needs to be excluded. Therefore, the initial clinical workup is to exclude aggressive characteristics suggesting malignancy and to identify characteristics predictive of the most common benign lesion, an adrenal adenoma. Predicting a benign adenoma using a variety of imaging modalities has been widely studied using unenhanced computed tomography (CT), contrast enhanced CT, and magnetic resonance (MR) imaging...
January 4, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28058482/comparison-of-the-effects-of-model-based-iterative-reconstruction-and-filtered-back-projection-algorithms-on-software-measurements-in-pulmonary-subsolid-nodules
#4
Julien G Cohen, Hyungjin Kim, Su Bin Park, Bram van Ginneken, Gilbert R Ferretti, Chang Hyun Lee, Jin Mo Goo, Chang Min Park
OBJECTIVES: To evaluate the differences between filtered back projection (FBP) and model-based iterative reconstruction (MBIR) algorithms on semi-automatic measurements in subsolid nodules (SSNs). METHODS: Unenhanced CT scans of 73 SSNs obtained using the same protocol and reconstructed with both FBP and MBIR algorithms were evaluated by two radiologists. Diameter, mean attenuation, mass and volume of whole nodules and their solid components were measured. Intra- and interobserver variability and differences between FBP and MBIR were then evaluated using Bland-Altman method and Wilcoxon tests...
January 5, 2017: European Radiology
https://www.readbyqxmd.com/read/28048071/su-f-r-39-effects-of-radiation-dose-reduction-on-renal-cell-carcinoma-discrimination-using-multi-phasic-ct-imaging
#5
M Wahi-Anwar, S Young, P Lo, S Raman, H Kim, M Brown, M McNitt-Gray, H Coy, D Ashen-Garry, E Pace-Soler
PURPOSE: A method to discriminate different types of renal cell carcinoma (RCC) was developed using attenuation values observed in multiphasic contrast-enhanced CT. This work evaluates the sensitivity of this RCC discrimination task at different CT radiation dose levels. METHODS: We selected 5 cases of kidney lesion patients who had undergone four-phase CT scans covering the abdomen to the lilac crest. Through an IRB-approved study, the scans were conducted on 64-slice CT scanners (Definition AS/Definition Flash, Siemens Healthcare) using automatic tube-current modulation (TCM)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046266/we-fg-207b-09-experimental-assessment-of-noise-and-spatial-resolution-in-virtual-non-contrast-dual-energy-ct-images-across-multiple-patient-sizes-and-ct-systems
#6
J Montoya, A Ferrero, L Yu, S Leng, C McCollough
PURPOSE: To investigate the noise and spatial resolution properties of virtual non-contrast (VNC) dual-energy CT images compared to true non-contrast (TNC) images across multiple patient sizes and CT systems. METHODS: Torso-shaped water phantoms with lateral widths of 25, 30, 35, 40 and 45 cm and a high resolution bar pattern phantom (Catphan CTP528) were scanned using 2nd and 3rd generation dual-source CT systems (Scanner A: Somatom Definition Flash, Scanner B: Somatom Force, Siemens Healthcare) in dual-energy scan mode with the same radiation dose for a given phantom size...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046024/chest-fat-quantification-via-ct-based-on-standardized-anatomy-space-in-adult-lung-transplant-candidates
#7
Yubing Tong, Jayaram K Udupa, Drew A Torigian, Dewey Odhner, Caiyun Wu, Gargi Pednekar, Scott Palmer, Anna Rozenshtein, Melissa A Shirk, John D Newell, Mary Porteous, Joshua M Diamond, Jason D Christie, David J Lederer
PURPOSE: Overweight and underweight conditions are considered relative contraindications to lung transplantation due to their association with excess mortality. Yet, recent work suggests that body mass index (BMI) does not accurately reflect adipose tissue mass in adults with advanced lung diseases. Alternative and more accurate measures of adiposity are needed. Chest fat estimation by routine computed tomography (CT) imaging may therefore be important for identifying high-risk lung transplant candidates...
2017: PloS One
https://www.readbyqxmd.com/read/28027764/xenon-enhanced-ct-using-subtraction-ct-basic-and-preliminary-clinical-studies-for-comparison-of-its-efficacy-with-that-of-dual-energy-ct-and-ventilation-spect-ct-to-assess-regional-ventilation-and-pulmonary-functional-loss-in-smokers
#8
Yoshiharu Ohno, Takeshi Yoshikawa, Daisuke Takenaka, Yasuko Fujisawa, Naoki Sugihara, Yuji Kishida, Shinichiro Seki, Hisanobu Koyama, Kazuro Sugimura
PURPOSE: To prospectively and directly compare the capability for assessments of regional ventilation and pulmonary functional loss in smokers of xenon-ventilation CT obtained with the dual-energy CT (DE-CT) and subtraction CT (Sub-CT) MATERIALS AND METHODS: Twenty-three consecutive smokers (15 men and 8 women, mean age: 69.7±8.7years) underwent prospective unenhanced and xenon-enhanced CTs, the latter by Sub-CT and DE-CT methods, ventilation SPECT and pulmonary function tests. Sub-CT was generated from unenhanced and xenon-enhanced CT, and all co-registered SPECT/CT data were produced from SPECT and unenhanced CT data...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28005510/case-237-renal-cell-carcinoma-with-osseous-metaplasia
#9
Billy Ming Hei Lai, Solomon Yig Joon Ka, Wai Kuen Kan, Man Wah Lam, Tang Fei Lee, Yun Hoi Lui, Jennifer Lai San Khoo
History A 47-year-old man presented with palpitations and decreased exercise tolerance. A peripheral blood smear revealed anemia, thrombocytopenia, and blast cells, and a diagnosis of acute myeloid leukemia was made. Immunohistochemistry revealed positivity for cluster of differentiation (or CD) markers, which have been reported to be associated with an increased risk of extramedullary leukemic involvement. Thus, contrast material-enhanced computed tomography (CT) of the thorax, abdomen, and pelvis was requested to enable exclusion of any extramedullary extension of leukemia...
January 2017: Radiology
https://www.readbyqxmd.com/read/27993096/impact-of-hybrid-iterative-reconstruction-on-unenhanced-liver-ct
#10
Masatoshi Kondo, Akihiro Nishie, Nobuhiro Fujita, Koichiro Morita, Takashi Shirasaka, Hisao Arimura, Yasuhiko Nakamura, Hiroshi Honda
OBJECTIVES: To clarify the impact of hybrid iterative reconstruction (HIR) and filtered-back projection (FBP) on unenhanced liver CT. METHODS: Thirty patients with hepatocellular carcinoma (HCC) underwent unenhanced CT. The images were reconstructed with FBP and weak (level 1), mild (level 4), and strong (level 7) levels of HIR (iDose(4)). Quantitatively, attenuation of the HCC (with the largest lesion in each case), hepatic parenchyma (the average of four segments) and image noise (standard deviation of the attenuations in hepatic parenchyma) were compared between the four kinds of reconstruction using the two-tailed paired t test...
December 20, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27992512/68ga-trap-rgd-3-hybrid-imaging-for-the-in-vivo-monitoring-of-%C3%AE-v%C3%A3-3-integrin-expression-as-biomarker-of-anti-angiogenic-therapy-effects-in-experimental-breast-cancer
#11
Philipp M Kazmierczak, Andrei Todica, Franz-Josef Gildehaus, Heidrun Hirner-Eppeneder, Matthias Brendel, Ralf S Eschbach, Magdalena Hellmann, Konstantin Nikolaou, Maximilian F Reiser, Hans-Jürgen Wester, Saskia Kropf, Axel Rominger, Clemens C Cyran
OBJECTIVES: To investigate 68Ga-TRAP-(RGD)3 hybrid imaging for the in vivo monitoring of αvß3-integrin expression as biomarker of anti-angiogenic therapy effects in experimental breast cancer. MATERIALS AND METHODS: Human breast cancer (MDA-MB-231) xenografts were implanted orthotopically into the mammary fat pads of n = 25 SCID mice. Transmission/emission scans (53 min to 90 min after i.v. injection of 20 MBq 68Ga-TRAP-(RGD)3) were performed on a dedicated small animal PET before (day 0, baseline) and after (day 7, follow-up) a 1-week therapy with the VEGF antibody bevacizumab or placebo (imaging cohort n = 13; therapy n = 7, control n = 6)...
2016: PloS One
https://www.readbyqxmd.com/read/27966043/radiation-dose-reduction-using-100-kvp-and-a-sinogram-affirmed-iterative-reconstruction-algorithm-in-adolescent-head-ct-impact-on-grey-white-matter-contrast-and-image-noise
#12
Yasunori Nagayama, Takeshi Nakaura, Akinori Tsuji, Joji Urata, Mitsuhiro Furusawa, Hideaki Yuki, Kenichiro Hirarta, Masafumi Kidoh, Seitaro Oda, Daisuke Utsunomiya, Yasuyuki Yamashita
OBJECTIVES: To retrospectively evaluate the image quality and radiation dose of 100-kVp scans with sinogram-affirmed iterative reconstruction (IR) for unenhanced head CT in adolescents. METHODS: Sixty-nine patients aged 12-17 years underwent head CT under 120- (n = 34) or 100-kVp (n = 35) protocols. The 120-kVp images were reconstructed with filtered back-projection (FBP), 100-kVp images with FBP (100-kVp-F) and sinogram-affirmed IR (100-kVp-S). We compared the effective dose (ED), grey-white matter (GM-WM) contrast, image noise, and contrast-to-noise ratio (CNR) between protocols in supratentorial (ST) and posterior fossa (PS)...
December 13, 2016: European Radiology
https://www.readbyqxmd.com/read/27933409/imaging-trends-in-suspected-appendicitis-a-canadian-perspective
#13
Victoria F Tan, Michael N Patlas, Douglas S Katz
PURPOSE: The purpose of our study was to assess trends in the imaging of suspected appendicitis in adult patients in emergency departments of academic centers in Canada. METHODS: A questionnaire was sent to all 17 academic centers in Canada to be completed by a radiologist who works in emergency radiology. The questionnaires were sent and collected over a period of 4 months from October 2015 to February 2016. RESULTS: Sixteen centers (94%) responded to the questionnaire...
December 8, 2016: Emergency Radiology
https://www.readbyqxmd.com/read/27920487/synchronous-occurrence-of-a-hepatic-myelolipoma-and-two-hepatocellular-carcinomas
#14
Shao-Yan Xu, Hai-Yang Xie, Lin Zhou, Shu-Sen Zheng, Wei-Lin Wang
Myelolipoma is a rare tumor composed of fat and bone marrow components, most of which are located in the adrenal gland. Myelolipoma in the liver is extremely rare. To date, only 10 cases have been reported in the English-language medical literature. In one of these cases, the hepatic myelolipoma was found within a hepatocellular carcinoma (HCC). In the present study, we report the first case of the synchronous occurrence of hepatic myelolipoma and HCCs in different liver sections of one patient, a 26-year-old female who was admitted to our hospital because of a 4-d history of upper abdominal pain...
November 21, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27917808/unenhanced-computed-tomography-findings-of-renal-papillae-in-patients-with-a-ureteral-stone
#15
Selim Serter, Erkan Sahin, Utku Mahir Yildirim, Murat Arslan, Ayhan Karakose
PURPOSE: In some patients with a ureteral stone without uretero-hydronephrosis, it is difficult to determine the location of the stone. The objective of the present study was to investigate the changes in renal papillae using unenhanced computerized tomography (uCT) and determine the side of calculi using the renal papillary findings in patients with a ureteral stone. METHODS: uCT data from 81 patients were retrospectively reviewed for this study. The inclusion criteria were unilateral ureteral calculi, no renal calculi and no hydronephrosis...
December 1, 2016: Clinical and Investigative Medicine. Médecine Clinique et Experimentale
https://www.readbyqxmd.com/read/27916593/clinical-application-of-dual-energy-spectral-computed-tomography-in-detecting-cholesterol-gallstones-from-surrounding-bile
#16
Chuang-Bo Yang, Shuang Zhang, Yong-Jun Jia, Hai-Feng Duan, Guang-Ming Ma, Xi-Rong Zhang, Yong Yu, Tai-Ping He
RATIONALE AND OBJECTIVE: This study aimed to investigate the clinical value of spectral computed tomography (CT) in the detection of cholesterol gallstones from surrounding bile. MATERIALS AND METHODS: This study was approved by the institutional review board. The unenhanced spectral CT data of 24 patients who had surgically confirmed cholesterol gallstones were analyzed. Lipid concentrations and CT numbers were measured from fat-based material decomposition image and virtual monochromatic image sets (40-140 keV), respectively...
December 1, 2016: Academic Radiology
https://www.readbyqxmd.com/read/27906443/letter-to-the-editor-unenhanced-whole-body-mri-versus-pet-ct-for-the-detection-of-prostate-cancer-metastases-after-primary-treatment
#17
C D'Aniello, C Cavaliere, F Fiorica, G Facchini
No abstract text is available yet for this article.
November 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27902605/angiomyofibroblastoma-of-the-mediastinum-a-case-report-and-literature-review
#18
Jianguo Zhu, Sheng Su, Haige Li
INTRODUCTION: Angiomyofibroblastoma (AMFB) is an extremely rare disease. It commonly occurs in middle-aged females and mainly involves the vulvovaginal region. Pathological examination plays an important role in differentiating from other tumors. But far less published literature focus on the imaging characteristics of AMFB. CLINICAL FINDINGS/DIAGNOSES: We reported a case of AMFB in a 73-year-old male, involving the mediastinum with computed tomography (CT) imaging and pathologic findings...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27897036/computed-tomography-and-magnetic-resonance-findings-of-fat-poor-angiomyolipomas
#19
Aaron M Potretzke, Theodora A Potretzke, Tyler M Bauman, B Alexander Knight, Alyssa M Park, Jonathan M Mobley, Robert Sherburne Figenshau, Cary Lynn Siegel
INTRODUCTION: Approximately 5% of angiomyolipomas (AMLs) are classified as "fat poor" due to lack of visually detectable fat on imaging, making them difficult to distinguish from renal cell carcinoma. Recent investigations have proposed CT and MR imaging features suggestive of fat-poor AML (fp-AML). Herein, we determined the frequency of these features in a cohort of fp-AMLs by retrospective review of preoperative imaging. METHODS: A pathology database query from January 2005 to August 2013 identified 49 renal specimens of AML with available imaging...
January 3, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/27887644/copenhagen-comorbidity-in-hiv-infection-cocomo-study-a-study-protocol-for-a-longitudinal-non-interventional-assessment-of-non-aids-comorbidity-in-hiv-infection-in-denmark
#20
Andreas Ronit, Judith Haissman, Ditte Marie Kirkegaard-Klitbo, Thomas Skårup Kristensen, Anne-Mette Lebech, Thomas Benfield, Jan Gerstoft, Henrik Ullum, Lars Køber, Andreas Kjær, Klaus Kofoed, Jørgen Vestbo, Børge Nordestgaard, Jens Lundgren, Susanne Dam Nielsen
BACKGROUND: Modern combination antiretroviral therapy (cART) has improved survival for people living with HIV (PLWHIV). Non-AIDS comorbidities have replaced opportunistic infections as leading causes of mortality and morbidity, and are becoming a key health concern as this population continues to age. The aim of this study is to estimate the prevalence and incidence of non-AIDS comorbidity among PLWHIV in Denmark in the cART era and to determine risk factors contributing to the pathogenesis...
November 26, 2016: BMC Infectious Diseases
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