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https://www.readbyqxmd.com/read/28221262/recent-advances-in-computed-tomographic-technology-cardiopulmonary-imaging-applications
#1
Azadeh Tabari, Roberto Lo Gullo, Venkatesh Murugan, Alexi Otrakji, Subba Digumarthy, Mannudeep Kalra
Cardiothoracic diseases result in substantial morbidity and mortality. Chest computed tomography (CT) has been an imaging modality of choice for assessing a host of chest diseases, and technologic advances have enabled the emergence of coronary CT angiography as a robust noninvasive test for cardiac imaging. Technologic developments in CT have also enabled the application of dual-energy CT scanning for assessing pulmonary vascular and neoplastic processes. Concerns over increasing radiation dose from CT scanning are being addressed with introduction of more dose-efficient wide-area detector arrays and iterative reconstruction techniques...
March 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28212047/multimaterial-decomposition-algorithm-for-the-quantification-of-liver-fat-content-by-using-fast-kilovolt-peak-switching-dual-energy-ct-clinical-evaluation
#2
Tomoko Hyodo, Norihisa Yada, Masatoshi Hori, Osamu Maenishi, Peter Lamb, Kosuke Sasaki, Minori Onoda, Masatoshi Kudo, Teruhito Mochizuki, Takamichi Murakami
Purpose To assess the clinical accuracy and reproducibility of liver fat quantification with the multimaterial decomposition (MMD) algorithm, comparing the performance of MMD with that of magnetic resonance (MR) spectroscopy by using liver biopsy as the reference standard. Materials and Methods This prospective study was approved by the institutional ethics committee, and patients provided written informed consent. Thirty-three patients suspected of having hepatic steatosis underwent non-contrast material-enhanced and triple-phase dynamic contrast-enhanced dual-energy computed tomography (CT) (80 and 140 kVp) and single-voxel proton MR spectroscopy within 30 days before liver biopsy...
February 17, 2017: Radiology
https://www.readbyqxmd.com/read/28198113/early-body-composition-but-not-body-mass-is-associated-with-future-accelerated-decline-in-muscle-quality
#3
Elisa Fabbri, Nancy Chiles Shaffer, Marta Gonzalez-Freire, Michelle D Shardell, Marco Zoli, Stephanie A Studenski, Luigi Ferrucci
BACKGROUND: Muscle quality (MQ) or strength-to-mass ratio declines with aging, but the rate of MQ change with aging is highly heterogeneous across individuals. The identification of risk factors for accelerated MQ decline may offer clues to identity the underpinning physiological mechanisms and indicate targets for prevention and treatment. Using data from the Baltimore Longitudinal Study of Aging, we tested whether measures of body mass and body composition are associated with differential rates of changes in MQ with aging...
February 14, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28196758/evaluation-of-image-quality-of-coronary-artery-plaque-with-rapid-kvp-switching-dual-energy-ct
#4
Yasutoshi Ohta, Shinichiro Kitao, Tomomi Watanabe, Junichi Kishimoto, Kazuhiro Yamamoto, Toshihide Ogawa
We evaluated the virtual monochromatic imaging (VMI) energy levels that maximize image quality of each coronary plaque component in dual-energy computed tomography angiography in 495 coronary segments (45 for each energy level). Maximal signal-to-noise ratios were different for plaque, lumen, fat, and surrounding tissue (p<0.05). Maximal contrast-to-noise ratios were observed at 70keV for calcified plaque (CP), non-calcified plaque (NCP), and fat in comparison with the lumen (p<0.05), and 70keV and 120keV for NCP in comparison with fat (p=0...
February 1, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28182767/correction-dual-energy-ct-pulmonary-angiography-with-6g-iodine-a-propensity-score-matched-study
#5
Andreas Meier, Kai Higashigaito, Katharina Martini, Moritz Wurnig, Burkhardt Seifert, Dagmar I Keller, Thomas Frauenfelder, Hatem Alkadhi
[This corrects the article DOI: 10.1371/journal.pone.0167214.].
2017: PloS One
https://www.readbyqxmd.com/read/28182581/application-of-single-and-dual-energy-ct-brain-tissue-segmentation-to-pet-monitoring-of-proton-therapy
#6
Bianca Berndt, Guillaume Landry, Florian Schwarz, Thomas Tessonnier, Florian Kamp, Georgios Dedes, Christian Thieke, Matthias Wuerl, Christopher Kurz, Ute Ganswindt, Frank Verhaegen, Juergen Debus, Claus Belka, Wieland Sommer, Maximilian Reiser, Julia Bauer, Katia Parodi
The purpose of this work was to evaluate the ability of single and dual energy computed tomography (SECT, DECT) to estimate tissue composition and density for usage in Monte Carlo (MC) simulations of irradiation induced β<sup>+</sup> activity distributions. This was done to assess the impact on positron emission tomography (PET) range verification in proton therapy. A DECT-based brain tissue segmentation method was developed for white matter (WM), grey matter (GM) and cerebrospinal fluid (CSF)...
February 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28169332/secreted-frizzled-related-protein-1-overexpression-in-gastric-cancer-relationship-with-radiological-findings-of-dual-energy-spectral-ct-and-pet-ct
#7
Huimin Lin, Guoyuan Yang, Bei Ding, Miao Zhang, Mingjun Zhang, Fuhua Yan, Ying Qu, Huan Zhang
We explored the role of secreted frizzled-related protein 1 (sFRP1) overexpression in gastric cancer and its relationship with radiological findings from dual-energy spectral CT(DEsCT) and positron emission tomography/computed tomography (PET/CT). We established mouse metastatic models using the SGC-7901/sFRP1 gastric cancer cell line. A control group was established using the SGC-7901/vector cell line. The models were then scanned with dual-energy spectral CT and PET-CT. Subsequent analysis, including immunohistochemistry and Transferase-mediated deoxyuridine triphosphate-biotin nick end labelling (TUNEL), was performed to confirm the role of sFRP1...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28168368/accuracy-of-iodine-quantification-using-dual-energy-ct-in-latest-generation-dual-source-and-dual-layer-ct
#8
Gert Jan Pelgrim, Robbert W van Hamersvelt, Martin J Willemink, Bernhard T Schmidt, Thomas Flohr, Arnold Schilham, Julien Milles, Matthijs Oudkerk, Tim Leiner, Rozemarijn Vliegenthart
OBJECTIVE: To determine the accuracy of iodine quantification with dual energy computed tomography (DECT) in two high-end CT systems with different spectral imaging techniques. METHODS: Five tubes with different iodine concentrations (0, 5, 10, 15, 20 mg/ml) were analysed in an anthropomorphic thoracic phantom. Adding two phantom rings simulated increased patient size. For third-generation dual source CT (DSCT), tube voltage combinations of 150Sn and 70, 80, 90, 100 kVp were analysed...
February 6, 2017: European Radiology
https://www.readbyqxmd.com/read/28142251/evaluation-of-a-proper-cutoff-value-on-quantitative-dual-energy-perfusion-ct-for-the-assessment-of-acute-pulmonary-thromboembolism
#9
Yoshie Kunihiro, Munemasa Okada, Naofumi Matsunaga
Background The cutoff value for assessing the severity of acute pulmonary thromboembolism (PTE) using relative volumetric evaluations of dual-energy perfusion computed tomography (DEpCT) is unclear. Purpose To determine the proper cutoff value for determining the severity of PTE using DEpCT volumetry. Material and Methods A total of 185 patients with venous thromboembolism were included in this study, of whom 61 were diagnosed with acute PTE. DEpCT images were three-dimensionally reconstructed at the following attenuation ranges: 1-2 HU (V2), 1-10 HU (V10), and 1-120 HU (V120)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28137404/relevant-aspects-of-imaging-in-the-diagnosis-and-management-of-gout
#10
Eloy De Avila Fernandes, Samuel Brighenti Bergamaschi, Tatiane Cantarelli Rodrigues, Gustavo Coelho Dias, Ralff Malmann, Germano Martins Ramos, Soraya Silveira Monteiro
Gout is an inflammatory arthritis characterized by the deposition of monosodium urate crystals in the synovial membrane, articular cartilage and periarticular tissues leading to inflammation. Men are more commonly affected, mainly after the 5th decade of life. Its incidence has been growing with the population aging. In the majority of the cases, the diagnosis is made by clinical criteria and synovial fluid analysis, in search for monosodium urate crystals. Nonetheless, gout may sometimes have atypical presentations, complicating the diagnosis...
January 2017: Revista Brasileira de Reumatologia
https://www.readbyqxmd.com/read/28133030/-evaluation-of-the-therapeutic-effect-of-using-dual-energy-ct-for-rectal-cancer-after-neoadjuvant-chemotherapy
#11
Hajime Morohashi, Yoshiyuki Sakamoto, Daichi Ichinohe, Hiroyuki Jin, Takuya Miura, Fumiyasu Tsushima, Shuichi Ono, Kenichi Hakamada
It is difficult to know the effects of preoperative treatment on advanced rectal cancer even if using a variety of diagnostic imaging modalities. We report the efficacy of evaluating the therapeutic effect of using dual-energy CT(DECT)against rectal cancer after neoadjuvant chemotherapy(NAC). The subject sample consisted of1 1 patients who underwent rectal cancer surgery after NAC from September 2015 to January 2016. The pathological effective grade was higher if the after/before ratio ofcontrast enhancement on DECT was small(Grade 1a: 1...
November 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28132073/effective-use-of-the-hounsfield-unit-in-the-age-of-variable-energy-ct
#12
David Bolus, Desiree Morgan, Lincoln Berland
BACKGROUND: The increasing use of dual-energy computed tomography (CT) and of reduced kVp protocols exposes the marked energy dependence of the Hounsfield unit (HU) as a measure of X-ray attenuation. This dependence of HU on energy limits its use as a quantitative diagnostic parameter, potentially leading to inaccurate diagnoses. PURPOSE: To describe a method for annotating the HU using superscripts and subscripts that inform the observer of the origin of the unit...
January 28, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28126221/dual-energy-computed-tomography-in-genitourinary-imaging
#13
REVIEW
Achille Mileto, Daniele Marin
Reignited by innovations in scanner engineering and software design, dual-energy computed tomography (CT) has come back into the clinical radiology arena in the last decade. Possibilities for noninvasive in vivo characterization of genitourinary disease, especially for renal stones and renal masses, have become the pinnacle offerings of dual-energy CT for body imaging in clinical practice. This article renders a state-of-the-art review on clinical applications of dual-energy CT in genitourinary imaging.
March 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28120855/the-beneficial-effects-of-aerobic-and-concurrent-training-on-metabolic-profile-and-body-composition-after-detraining-a-1-year-follow-up-in-postmenopausal-women
#14
F E Rossi, T A Diniz, L M Neves, A C S Fortaleza, J Gerosa-Neto, D S Inoue, C Buonani, J M Cholewa, F S Lira, I F Freitas
BACKGROUND/OBJECTIVES: Aerobic and concurrent training (CT, aerobic and strength training) improves body composition and metabolic profile; however, it is not known whether these positive outcomes acquired after aerobic or CT are maintained long term (⩾6 months) after program interruption in postmenopausal women. This study investigated the changes in total and appendicular body composition, bone mineral density and metabolic profile following 16 weeks of aerobic or CT, and through 6 months and 1 year of detraining in postmenopausal women...
January 25, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28109932/accuracy-of-noncontrast-quiescent-interval-single-shot-lower-extremity-mr-angiography-versus-ct%C3%A2-angiography-for-diagnosis-of-peripheral-artery-disease-comparison-with-digital-subtraction-angiography
#15
Akos Varga-Szemes, Julian L Wichmann, U Joseph Schoepf, Pal Suranyi, Carlo N De Cecco, Giuseppe Muscogiuri, Damiano Caruso, Ricardo T Yamada, Sheldon E Litwin, Christian Tesche, Taylor M Duguay, Shivraman Giri, Rozemarijn Vliegenthart, Thomas M Todoran
OBJECTIVES: This study sought to evaluate the image quality and diagnostic accuracy of noncontrast quiescent-interval single-shot (QISS) magnetic resonance angiography (MRA) versus iodine-contrast computed tomography angiography (CTA) in patients with peripheral artery disease (PAD), with invasive digital subtraction angiography (DSA) as the reference standard. BACKGROUND: QISS is a recently introduced noncontrast MRA technique. Although the diagnostic accuracy of QISS is reportedly similar to that of contrast-enhanced MRA, its performance compared with contrast-enhanced CTA, the most frequently used noninvasive modality for evaluation of PAD, is unknown...
January 12, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28108802/opportunistic-screening-for-osteoporosis-by-routine-ct-in-southern-europe
#16
Elena Alacreu, David Moratal, Estanislao Arana
: Feasibility evaluation of early detection of osteoporosis in oncologic patients by bone mineral density (BMD) on abdominal computed tomography (CT) scans performed for other clinical indications, by using dual-energy X-ray absorptiometry (DXA) as reference. Abdominal CT images can identify patients with osteoporosis BMD without additional radiation exposure or cost. INTRODUCTION: The purpose of the study is to evaluate the feasibility of early detection of osteoporosis by bone mineral density (BMD) on abdominal computed tomography (CT) scans performed in oncologic patients, comparing calibrated and uncalibrated measurements by using dual-energy X-ray absorptiometry (DXA) as reference...
January 20, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28107411/xenon-enhanced-dual-energy-ct-imaging-in-combined-pulmonary-fibrosis-and-emphysema
#17
Keishi Sugino, Masahiro Kobayashi, Yasuhiko Nakamura, Kyoko Gocho, Fumiaki Ishida, Kazutoshi Isobe, Nobuyuki Shiraga, Sakae Homma
BACKGROUND: Little has been reported on the feasibility of xenon-enhanced dual-energy computed tomography (Xe-DECT) in the visual and quantitative analysis of combined pulmonary fibrosis and emphysema (CPFE). OBJECTIVES: We compared CPFE with idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD), as well as correlation with parameters of pulmonary function tests (PFTs). METHODS: Studied in 3 groups were 25 patients with CPFE, 25 with IPF without emphysema (IPF alone), 30 with COPD...
2017: PloS One
https://www.readbyqxmd.com/read/28099359/evaluation-of-pulmonary-function-using-single-breath-hold-dual-energy-computed-tomography-with-xenon-results-of-a-preliminary-study
#18
Hiroyuki Kyoyama, Yusuke Hirata, Satoshi Kikuchi, Kosuke Sakai, Yuriko Saito, Shintaro Mikami, Gaku Moriyama, Hisami Yanagita, Wataru Watanabe, Katharina Otani, Norinari Honda, Kazutsugu Uematsu
Xenon-enhanced dual-energy computed tomography (xenon-enhanced CT) can provide lung ventilation maps that may be useful for assessing structural and functional abnormalities of the lung. Xenon-enhanced CT has been performed using a multiple-breath-hold technique during xenon washout. We recently developed xenon-enhanced CT using a single-breath-hold technique to assess ventilation. We sought to evaluate whether xenon-enhanced CT using a single-breath-hold technique correlates with pulmonary function testing (PFT) results...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28096049/monoenergetic-reconstructions-for-imaging-of-coronary-artery-stents-using-spectral-detector-ct-in-vitro-experience-and-comparison-to-conventional-images
#19
Tilman Hickethier, Bettina Baeßler, Jan Robert Kroeger, Jonas Doerner, Gregor Pahn, David Maintz, Guido Michels, Alexander C Bunck
PURPOSE: Accurate assessment of coronary stents using non-invasive CT imaging remains challenging despite new stent materials and improvements in CT technology. Virtual monoenergetic (monoE) images reconstructed from dual energy CT acquisitions potentially decrease artifacts caused by coronary stents. A novel spectral detector technology provides monoE and conventional images simultaneously for all conducted scans. The purpose of our study was to systematically investigate the influence of different monoE reconstructions on the visualization of coronary stent lumen in comparison to conventional images...
January 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28090446/quantitative-imaging-methods-in-osteoporosis
#20
REVIEW
Ling Oei, Fjorda Koromani, Fernando Rivadeneira, M Carola Zillikens, Edwin H G Oei
Osteoporosis is characterized by a decreased bone mass and quality resulting in an increased fracture risk. Quantitative imaging methods are critical in the diagnosis and follow-up of treatment effects in osteoporosis. Prior radiographic vertebral fractures and bone mineral density (BMD) as a quantitative parameter derived from dual-energy X-ray absorptiometry (DXA) are among the strongest known predictors of future osteoporotic fractures. Therefore, current clinical decision making relies heavily on accurate assessment of these imaging features...
December 2016: Quantitative Imaging in Medicine and Surgery
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