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Dual energy CT

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https://www.readbyqxmd.com/read/28107411/xenon-enhanced-dual-energy-ct-imaging-in-combined-pulmonary-fibrosis-and-emphysema
#1
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
#2
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
#3
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 3, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28090446/quantitative-imaging-methods-in-osteoporosis
#4
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
https://www.readbyqxmd.com/read/28081050/white-paper-of-the-society-of-computed-body-tomography-and-magnetic-resonance-on-dual-energy-ct-part-3-vascular-cardiac-pulmonary-and-musculoskeletal-applications
#5
Carlo N De Cecco, U Joseph Schoepf, Lynne Steinbach, Daniel T Boll, W Dennis Foley, Ravi K Kaza, David N Bolus, Desiree E Morgan, Dushyant V Sahani, William P Shuman, Marilyn J Siegel, Terri J Vrtiska, Benjamin M Yeh, Lincoln L Berland
This is the third of a series of 4 white papers that represent Expert Consensus Documents developed by the Society of Computed Body Tomography and Magnetic Resonance through its Task Force on dual-energy computed tomography. This paper, part 3, describes computed tomography angiography and thoracic, cardiac, vascular, and musculoskeletal clinical applications. At the end of the discussion of each application category (vascular, cardiac, pulmonary, and musculoskeletal), we present our consensus opinions on the current clinical utility of the application and opportunities for further research...
January 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28075606/potential-application-of-dual-energy-ct-in-gynecologic-cancer-initial-experience
#6
Ana Paula Benveniste, Silvana de Castro Faria, Gregory Broering, Dhakshina Moorthy Ganeshan, Eric P Tamm, Revathy B Iyer, Priya Bhosale
OBJECTIVE: The purpose of this article is to review the use of dual-energy CT (DECT) in the assessment of gynecologic cancer. CONCLUSION: DECT has the potential to improve diagnostic performance, may improve the ability to differentiate between simple cystic lesions and primary ovarian cancer, and may also improve the detection of musculoskeletal and liver metastases. Additional studies will be needed to determine the direction of future developments and the degree to which DECT will affect the imaging and management of gynecologic cancer...
January 11, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28071718/reproducibility-and-repeatability-of-computer-tomography-based-measurement-of-abdominal-subcutaneous-and-visceral-adipose-tissues
#7
Yuan-Hao Lee, Hsing-Fen Hsiao, Hou-Ting Yang, Shih-Yi Huang, Wing P Chan
Excessive accumulation of abdominal adipose tissue is a widely recognized as a major feature of obesity, and it can be quantified by dual-energy x-ray absorptiometry (DXA). However, in a phantom study, the inter- and intra-instrument reliability of DXA remains unpredictable. Thus, we attempted to determine the precision of estimates from computer tomography-based measurements and analysis with AZE Virtual Place software. To determine the inter-rater reproducibility and intra-rater repeatability of adipose tissue area estimates, we used the automatic boundary-tracing function of the AZE Virtual Place to generate cross-sectional areas of subcutaneous and visceral adipose tissues from the abdomen of reconstructed CT images...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28070917/dual-energy-ct-quantitative-imaging-a-comparison-study-between-twin-beam-and-dual-source-ct-scanners
#8
Isabel P Almeida, Lotte E J R Schyns, Michel C Öllers, Wouter van Elmpt, Katia Parodi, Guillaume Landry, Frank Verhaegen
PURPOSE: To assess image quality and to quantify the accuracy of relative electron densities (ρe ) and effective atomic numbers (Zeff ) for three dual-energy computed tomography (DECT) scanners: a novel single-source split-filter (i.e., twin-beam) and two dual-source scanners. METHODS: Measurements were made with a second generation dual-source scanner at 80/140Sn kVp, a third-generation twin-beam single-source scanner at 120 kVp with gold (Au) and tin (Sn) filters, and a third-generation dual-source scanner at 90/150Sn kVp...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28070843/noise-optimized-monoenergetic-post-processing-improves-visualization-of-incidental-pulmonary-embolism-in-cancer-patients-undergoing-single-pass-dual-energy-computed-tomography
#9
Jakob Weiss, Mike Notohamiprodjo, Malte Bongers, Christoph Schabel, Stefanie Mangold, Konstantin Nikolaou, Fabian Bamberg, Ahmed E Othman
PURPOSE: To evaluate noise-optimized monoenergetic postprocessing of dual-energy CT (DE-CT) on image quality in patients with incidental pulmonary embolism in single-pass portal-venous phase CT (CTpv). MATERIALS AND METHODS: 20 Consecutive patients with incidental pulmonary embolism in contrast-enhanced oncological follow-up DE-CTpv examination were included in this study. Images were acquired with a 3rd generation DE-CT system in DE mode (100/Sn150 kV) and activated tube current modulation 90 s after contrast agent administration...
January 9, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28070657/-how-to-incorporate-dual-energy-imaging-into-a-high-volume-abdominal-imaging-practice
#10
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/28068248/clinical-implementation-of-dual-energy-ct-for-proton-treatment-planning-on-pseudo-monoenergetic-ct-scans
#11
Patrick Wohlfahrt, Christian Möhler, Volker Hietschold, Stefan Menkel, Steffen Greilich, Mechthild Krause, Michael Baumann, Wolfgang Enghardt, Christian Richter
PURPOSE: To determine whether a standardized clinical application of dual-energy computed tomography (DECT) for proton treatment planning based on pseudomonoenergetic CT scans (MonoCTs) is feasible and increases the precision of proton therapy in comparison with single-energy CT (SECT). METHODS AND MATERIALS: To define an optimized DECT protocol, CT scan settings were analyzed experimentally concerning beam hardening, image quality, and influence on the heuristic conversion of CT numbers into stopping-power ratios (SPRs) and were compared with SECT scans with identical CT dose...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28065376/dual-energy-ct-virtual-non-calcium-technique-for-detection-of-bone-marrow-edema-in-patients-with-vertebral-fractures-a-prospective-feasibility-study-on-a-single-source-volume-ct-scanner
#12
T Diekhoff, K G Hermann, M Pumberger, B Hamm, M Putzier, M Fuchs
OBJECTIVES: Dual-energy computed tomography (DECT) is a recent development for detecting bone marrow edema (BME) in patients with vertebral compression fractures. The aim of this pilot study was to determine the reliability of single-source DECT in detecting vertebral BME using magnetic resonance imaging (MRI) as standard of reference. MATERIALS AND METHODS: Nine patients with radiographic thoracic or lumbar vertebral compression fractures underwent both, DECT on a 320-row single-source scanner and 1...
February 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28065375/accessory-spleen-versus-lymph-node-value-of-iodine-quantification-with-dual-energy-computed-tomography
#13
Sebastian Winklhofer, Wei-Ching Lin, Jack W Lambert, Benjamin M Yeh
OBJECTIVES: To evaluate whether iodine quantification with Dual-Energy Computed Tomography (DECT) improves the differentiation of accessory spleens (AS) from lymph nodes (LN) compared to CT number measurements. METHODS: Abdominal DECT images of 75 patients with either AS (n=35) or LN (n=48) (benign entity) were retrospectively evaluated. Hounsfield Units (HU) and iodine concentrations of AS, LN and the main spleen were measured. Receiver operating characteristics (ROC) were performed to calculate an optimal threshold for distinguishing AS from LN...
February 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28063068/accuracy-of-177-lu-activity-quantification-in-spect-imaging-a-phantom-study
#14
Carlos F Uribe, Pedro L Esquinas, Jesse Tanguay, Marjorie Gonzalez, Emilie Gaudin, Jean-Mathieu Beauregard, Anna Celler
BACKGROUND: The aim of the study is to assess accuracy of activity quantification of (177)Lu studies performed according to recommendations provided by the committee on Medical Internal Radiation Dose (MIRD) pamphlets 23 and 26. The performances of two scatter correction and three segmentation methods were compared. Additionally, the accuracy of tomographic and planar methods for determination of the camera normalization factor (CNF) was evaluated. Eight phantoms containing inserts of different sizes and shapes placed in air, water, and radioactive background were scanned using a Siemens SymbiaT SPECT/CT camera...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28060999/statistical-image-domain-multi-material-decomposition-for-dual-energy-ct
#15
Yi Xue, Ruoshui Ruan, Xiuhua Hu, Yu Kuang, Jing Wang, Yong Long, Tianye Niu
PURPOSE: Dual-energy CT (DECT) enhances tissue characterization because of its basis material decomposition capability. In addition to conventional two-material decomposition from DECT measurements, multi-material decomposition (MMD) is required in many clinical applications. To solve the ill-posed problem of reconstructing multiple-material images from dual-energy measurements, additional constraints are incorporated into the formulation, including volume and mass conservation and the assumptions that at most three materials in each pixel and various material types among pixels...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28060193/imaging-in-chronic-thromboembolic-pulmonary-hypertension
#16
Rahul D Renapurkar, Sankaran Shrikanthan, Gustavo A Heresi, Charles T Lau, Deepa Gopalan
Chronic thromboembolic pulmonary hypertension (CTEPH) is one of the potentially curable causes of pulmonary hypertension and is definitively treated with pulmonary thromboendartectomy. CTEPH can be overlooked, as its symptoms are nonspecific and can be mimicked by a wide range of diseases that can cause pulmonary hypertension. Early diagnosis of CTEPH and prompt evaluation for surgical candidacy are paramount factors in determining future outcomes. Imaging plays a central role in the diagnosis of CTEPH and patient selection for pulmonary thromboendartectomy and balloon pulmonary angioplasty...
January 2, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28058498/diagnostic-accuracy-of-dual-energy-ct-and-ultrasound-in-gouty-arthritis-a%C3%A2-systematic-review
#17
J Chen, M Liao, H Zhang, D Zhu
OBJECTIVE: The aim of our study was to compare the overall accuracy of ultrasonography (US), with at least one sign positive (double contour, tophus, aggregates), and dual-energy CT in the diagnosis of gouty arthritis. METHODS: PubMed, Web of Science, EI, Elsevier, Wiley Online Library and Cochrane library were systematically searched for studies on the diagnostic performance of dual-energy CT (DECT) and ultrasound (US) from 2005 to February 2016. After study selection, data and quality assessment, the sensitivity (SEN), specificity (SPE), diagnostic odds rate (DOR), positive likelihood ratio (PLR), negative likelihood ratio (NLR) and summary receiver operating contraction racteristic (SROC) curves were calculated...
January 5, 2017: Zeitschrift Für Rheumatologie
https://www.readbyqxmd.com/read/28055861/a-novel-two-compartment-model-for-calculating-bone-volume-fractions-and-bone-mineral-densities-from-computed-tomography-images
#18
Hsin-Hon Lin, Shin-Lei Peng, Jay Wu, Tian-Yu Shih, Keh-Shih Chuang, Cheng-Ting Shih
Osteoporosis is a disease characterized by a degradation of bone structures. Various methods have been developed to diagnose osteoporosis by measuring bone mineral density (BMD) of patients. However, BMDs from these methods were not equivalent and were incomparable. In addition, partial volume effect introduces errors in estimating bone volume from computed tomography (CT) images using image segmentation. In this study, a two-compartment model (TCM) was proposed to calculate bone volume fraction (BV/TV) and BMD from CT images...
December 30, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28048802/tu-ab-brc-03-accurate-tissue-characterization-for-monte-carlo-dose-calculation-using-dual-and-multi-energy-ct-data
#19
A Lalonde, H Bouchard
PURPOSE: To develop a general method for human tissue characterization with dual-and multi-energy CT and evaluate its performance in determining elemental compositions and the associated proton stopping power relative to water (SPR) and photon mass absorption coefficients (EAC). METHODS: Principal component analysis is used to extract an optimal basis of virtual materials from a reference dataset of tissues. These principal components (PC) are used to perform two-material decomposition using simulated DECT data...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048785/su-f-j-08-quantitative-spect-imaging-of-ra-223-in-a-phantom
#20
J Yue, R Hobbs, G Sgouros, E Frey
PURPOSE: Ra-223 therapy of prostate cancer bone metastases is being used to treat patients routinely. However, the absorbed dose distribution at the macroscopic and microscopic scales remains elusive, due to the inability to image the small activities injected. Accurate activity quantification through imaging is essential to calculate the absorbed dose in organs and sub-units in radiopharmaceutical therapy, enabling personalized absorbed dose-based treatment planning methodologies and more effective and optimal treatments...
June 2016: Medical Physics
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