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https://www.readbyqxmd.com/read/27896386/dual-energy-ct-angiography-pros-and-cons-of-dual-energy-metal-artifact-reduction-algorithm-in-patients-after-endovascular-aortic-repair
#1
Johannes Boos, Jieming Fang, Benedikt H Heidinger, Vassilios Raptopoulos, Olga R Brook
PURPOSE: To evaluate the value of metal artifact reduction (MAR) post-processing and iodine MD images in fast kV-switching dual-energy computed tomography (DECT) in patients after endovascular aortic repair (EVAR). MATERIALS AND METHODS: Twenty-four consecutive EVAR patients (age 76 ± 9 years, 7/24 (29%) with coils, 9/24 (37.5%) with 10 endoleaks) who underwent DECT angiography were included in this HIPAA-compliant, IRB-approved retrospective study. Monochromatic reconstructions included 55, 60, 65, 70, and 75 keV with and without MAR and iodine MD images...
November 28, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27888303/dual-energy-ct-workflow-multi-institutional-consensus-on-standardization-of-abdominopelvic-mdct-protocols
#2
Bhavik N Patel, Lauren Alexander, Brian Allen, Lincoln Berland, Amir Borhani, Achille Mileto, Courtney Moreno, Desiree Morgan, Dushyant Sahani, William Shuman, Eric Tamm, Mitchell Tublin, Benjamin Yeh, Daniele Marin
PURPOSE: To standardize workflow for dual-energy computed tomography (DECT) involving common abdominopelvic exam protocols. MATERIALS AND METHODS: 9 institutions (4 rsDECT, 1 dsDECT, 4 both) with 32 participants [average # years (range) in practice and DECT experience, 12.3 (1-35) and 4.6 (1-14), respectively] filled out a single survey (n = 9). A five-point agreement scale (0, 1, 2, 3, 4-contra-, not, mildly, moderately, strongly indicated, respectively) and utilization scale (0-not performing and shouldn't; 1-performing but not clinically useful; 2-performing but not sure if clinically useful; 3-not performing it but would like to; 4-performing and clinically useful) were used...
November 25, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27882426/dual-energy-ct-of-the-brain-comparison-between-dect-angiography-derived-virtual-unenhanced-images-and-true-unenhanced-images-in-the-detection-of-intracranial-haemorrhage
#3
Matteo Bonatti, Fabio Lombardo, Giulia A Zamboni, Patrizia Pernter, Roberto Pozzi Mucelli, Giampietro Bonatti
OBJECTIVE: To evaluate the diagnostic performance of virtual non-contrast (VNC) images in detecting intracranial haemorrhages (ICHs). METHODS: Sixty-seven consecutive patients with and 67 without ICH who underwent unenhanced brain CT and DECT angiography were included. Two radiologists independently evaluated VNC and true non-contrast (TNC) images for ICH presence and type. Inter-observer agreement for VNC and TNC image evaluation was calculated. Sensitivity and specificity of VNC images for ICH detection were calculated using Fisher's exact test...
November 23, 2016: European Radiology
https://www.readbyqxmd.com/read/27880938/pathologic-stratification-of-operable-lung-adenocarcinoma-using-radiomics-features-extracted-from-dual-energy-ct-images
#4
Jung Min Bae, Ji Yun Jeong, Ho Yun Lee, Insuk Sohn, Hye Seung Kim, Ji Ye Son, O Jung Kwon, Joon Young Choi, Kyung Soo Lee, Young Mog Shim
PURPOSE: To evaluate the usefulness of surrogate biomarkers as predictors of histopathologic tumor grade and aggressiveness using radiomics data from dual-energy computed tomography (DECT), with the ultimate goal of accomplishing stratification of early-stage lung adenocarcinoma for optimal treatment. RESULTS: Pathologic grade was divided into grades 1, 2, and 3. Multinomial logistic regression analysis revealed i-uniformity and 97.5th percentile CT attenuation value as independent significant factors to stratify grade 2 or 3 from grade 1...
November 21, 2016: Oncotarget
https://www.readbyqxmd.com/read/27878637/optimization-of-window-settings-for-standard-and-advanced-virtual-monoenergetic-imaging-in-abdominal-dual-energy-ct-angiography
#5
Damiano Caruso, Ashley H Parinella, U Joseph Schoepf, Maxwell H Stroebel, Stefanie Mangold, Julian L Wichmann, Akos Varga-Szemes, B Devon Ball, Domenico De Santis, Andrea Laghi, Carlo N De Cecco
OBJECTIVES: To determine the optimal window setting for displaying virtual monoenergetic reconstructions of third generation dual-source, dual-energy CT (DECT) angiography of the abdomen. METHODS: Forty-five patients were evaluated with DECT angiography (90/150 kV, 180/90 ref. mAs). Three datasets were reconstructed: standard linear blending (M_0.6), 70 keV traditional virtual monoenergetic (M70), and 40 keV advanced noise-optimized virtual monoenergetic (M40+)...
November 23, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27865580/the-role-of-dual-energy-computed-tomography-in-the-assessment-of-pulmonary-function
#6
REVIEW
Hye Jeon Hwang, Eric A Hoffman, Chang Hyun Lee, Jin Mo Goo, David L Levin, Hans-Ulrich Kauczor, Joon Beom Seo
The assessment of pulmonary function, including ventilation and perfusion status, is important in addition to the evaluation of structural changes of the lung parenchyma in various pulmonary diseases. The dual-energy computed tomography (DECT) technique can provide the pulmonary functional information and high resolution anatomic information simultaneously. The application of DECT for the evaluation of pulmonary function has been investigated in various pulmonary diseases, such as pulmonary embolism, asthma and chronic obstructive lung disease and so on...
November 8, 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27863922/dual-energy-ct-to-reveal-pseudo-leakage-of-frozen-elephant-trunk
#7
Robbert Willem van Hamersvelt, Pim A de Jong, Thomas C Dessing, Tim Leiner, Martin J Willemink
In this case report dual energy CT information was used to reveal a pseudo leakage of a frozen elephant trunk stent. Different materials, which could not be distinguished based on attenuation number, were distinguished with the use of material decomposition algorithms using DECT acquisitions. By using material decomposition imaging, the DECT system proved that in this case the extraluminal densities were not caused by leakage but by a Teflon Felt supported suture.
November 10, 2016: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/27847998/quantitative-iodine-content-threshold-for-discrimination-of-renal-cell-carcinomas-using-rapid-kv-switching-dual-energy-ct
#8
Jessica G Zarzour, Desmin Milner, Roberto Valentin, Bradford E Jackson, Jennifer Gordetsky, Janelle West, Soroush Rais-Bahrami, Desiree E Morgan
PURPOSE: Determine iodine content threshold discriminating papillary renal cell carcinomas (pRCC) from complex cysts (CCs) using rapid kV-switching dual-energy CT (rsDECT). MATERIALS AND METHODS: IRB-approved retrospective study of 72 consecutive patients with pathologic diagnosis of renal cell carcinoma, who underwent rsDECT from 2011 to 2015. Controls included consecutive patients with CC during same period. Iodine content of each pRCC (n = 27) was measured on rsDECT workstation for arterial (n = 15) or nephrographic phase (n = 12), and compared to iodine content for clear cell renal cell carcinomas (ccRCC, n = 46) and complex cysts (n = 54)...
November 16, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27846051/clinical-significance-of-late-phase-of-lung-perfusion-blood-volume-lung-perfusion-blood-volume-quantified-by-dual-energy-computed-tomography-in-patients-with-pulmonary-thromboembolism
#9
Hirofumi Koike, Eijun Sueyoshi, Ichiro Sakamoto, Masataka Uetani
PURPOSE: Using dual-energy computed tomography (DECT), we quantified the lung perfusion blood volume (PBV) in the late phase, which may reflect both the pulmonary artery and systemic collateral flow. We then investigated the clinical significance of late-phase lung PBV values. MATERIALS AND METHODS: We retrospectively studied 206 patients (266 scans) who underwent early-phase and late-phase DECT. The patients were divided into 2 groups depending on whether or not they had pulmonary thromboembolism (PTE) (n=94 and 112)...
November 11, 2016: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/27834477/dual-energy-cardiac-ct
#10
Patricia Carrascosa, Alejandro Deviggiano, Gastón Rodriguez-Granillo
Conventional single energy CT suffers from technical limitations related to the polychromatic nature of X-rays. Dual energy cardiac CT (DECT) shows promise to attenuate and even overcome some of these limitations, and might broaden the scope of patients eligible for cardiac CT towards the inclusion of higher risk patients. This might be achieved as a result of both safety (contrast reduction) and physiopathological (myocardial perfusion and characterization) issues. In this article, we will review the main clinical cardiac applications of DECT, that can be summarized in two core aspects: coronary artery evaluation, and myocardial evaluation...
November 11, 2016: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/27830163/dual-energy-ct-of-liver-metastases-in-patients-with-uveal-melanoma
#11
Jens Altenbernd, Axel Wetter, Michael Forsting, Lale Umutlu
OBJECTIVE: To investigate the value of different kVp images of dual-energy CT (DECT) for the detection of liver metastases. METHODS: 20 Patients with uveal melanoma were investigated with DECT of the liver. In each patient contrast-enhanced DECT imaging with arterial delay was performed. Number and size of metastases were documented on arterial phase 80-kVp images, virtual 120-kVp images and following angiographic images (DSA) as part of hepatic chemoperfusion. Attenuation of metastases and several anatomic regions, subjective (image noise, image quality) and objective (SNR, CNR) parameters were documented...
2016: European Journal of Radiology Open
https://www.readbyqxmd.com/read/27824672/the-feasibility-of-dual-energy-computed-tomography-in-cardiac-contusion-imaging-for-mildest-blunt-cardiac-injury
#12
Recep Sade, Mecit Kantarci, Hayri Ogul, Ummugulsum Bayraktutan, Mustafa Uzkeser, Sahin Aslan, Enbiya Aksakal, Necip Becit
PURPOSE: The purpose of this study was to evaluate the efficiency and feasibility of dual-energy computed tomography (DECT) used in the diagnosis of cardiac contusion with the mildest blunt cardiac injury. MATERIAL AND METHODS: This study was performed between February 2014 and September 2015; a total of 17 consecutive patients (10 men and 7 women; median age, 51 years [range: 20-78]) were enrolled in the study. The DECT was performed within 48 hours of the trauma and a subsequent follow-up DECT was performed a little less than 1 year after the first examination...
November 7, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27824670/white-paper-of-the-society-of-computed-body-tomography-and-magnetic-resonance-on-dual-energy-ct-part-4-abdominal-and-pelvic-applications
#13
Carlo N De Cecco, Daniel T Boll, David N Bolus, W Dennis Foley, Ravi K Kaza, Desiree E Morgan, Neil M Rofsky, Dushyant V Sahani, U Joseph Schoepf, William P Shuman, Marilyn J Siegel, Terri J Vrtiska, Benjamin M Yeh, Lincoln L Berland
This is the fourth 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 article, part 4, discusses DECT for abdominal and pelvic applications and, at the end of each, will offer our consensus opinions on the current clinical utility of the application and opportunities for further research.
November 7, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27820928/pulmonary-perfusion-changes-as-assessed-by-contrast-enhanced-dual-energy-computed-tomography-after-endoscopic-lung-volume-reduction-by-coils
#14
Frédéric Lador, Anne-Lise Hachulla, Olivia Hohn, Jérôme Plojoux, Maxime Ronot, Xavier Montet, Paola M Soccal
BACKGROUND: Endoscopic lung volume reduction by coils (LVRC) is a recent treatment approach for severe emphysema. Furthermore, dual-energy computed tomography (DECT) now offers a combined assessment of lung morphology and pulmonary perfusion. OBJECTIVES: The aim of our study was to assess the impact of LVRC on pulmonary perfusion with DECT. METHODS: Seventeen patients (64.8 ± 6.7 years) underwent LVRC. DECT was performed prior to and after LVRC...
2016: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/27802505/diagnosis-of-gout-a-systematic-review-in-support-of-an-american-college-of-physicians-clinical-practice-guideline
#15
Sydne J Newberry, John D FitzGerald, Aneesa Motala, Marika Booth, Margaret A Maglione, Dan Han, Abdul Tariq, Claire E O'Hanlon, Roberta Shanman, Whitney Dudley, Paul G Shekelle
Background: Alternative strategies exist for diagnosing gout that do not rely solely on the documentation of monosodium urate (MSU) crystals. Purpose: To summarize evidence regarding the accuracy of clinical tests and classification algorithms compared with that of a reference standard of MSU crystals in joint aspirate for diagnosing gout. Data Sources: Several electronic databases from inception to 29 February 2016. Study Selection: 21 prospective cohort, cross-sectional, and case-control studies including participants with joint inflammation and no previous definitive gout diagnosis who had MSU analysis of joint aspirate...
November 1, 2016: Annals of Internal Medicine
https://www.readbyqxmd.com/read/27786561/pelvic-beam-hardening-artifacts-in-dual-energy-ct-image-reconstructions-occurrence-and-impact-on-image-quality
#16
Sebastian Winklhofer, Jack W Lambert, Yuxin Sun, Zhen Jane Wang, Derek S Sun, Benjamin M Yeh
OBJECTIVE: The purpose of this study was to describe the frequency and appearance of beam-hardening artifacts on rapid-kilovoltage-switching dual-energy CT (DECT) image reconstructions of the pelvis. MATERIALS AND METHODS: Monochromatic (70, 52, and 120 keV) and material decomposition CT images (iodine-water and water-iodine) from consecutive pelvic rapid-kilovoltage-switching DECT scans were retrospectively evaluated. We recorded the presence, type (high versus low attenuation), and severity of beam-hardening artifacts (Likert scale from 0, barely seen, to 4, severe), clarity of anatomic delineation (Likert scale from 0, unimpaired, to 4, severely impaired) and SD of CT numbers, iodine and water concentrations, and gray-scale values for artifact-affected regions and corresponding unaffected reference tissue...
October 27, 2016: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/27782721/a-robust-empirical-parametrization-of-proton-stopping-power-using-dual-energy-ct
#17
Vicki T Taasti, Jørgen B B Petersen, Ludvig P Muren, Jesper Thygesen, David C Hansen
PURPOSE: In this study the authors present a new method for estimation of proton stopping power ratios (SPRs) using dual energy CT (DECT), which is robust toward CT noise. The authors propose a parametrization for SPR based directly on the CT numbers in a DECT image set, whereby the intermediate steps of estimating the relative electron density, ρe, and mean excitation energy, I, are avoided. METHODS: The SPR parametrization proposed in this study is a purely empirical fit based on the theoretical SPR values for a list of 34 reference human tissues...
October 2016: Medical Physics
https://www.readbyqxmd.com/read/27782703/towards-3d-printed-multifunctional-immobilization-for-proton-therapy-initial-materials-characterization
#18
Steven Michiels, Antoine D'Hollander, Nicolas Lammens, Mathias Kersemans, Guozhi Zhang, Jean-Marc Denis, Kenneth Poels, Edmond Sterpin, Sandra Nuyts, Karin Haustermans, Tom Depuydt
PURPOSE: 3D printing technology is investigated for the purpose of patient immobilization during proton therapy. It potentially enables a merge of patient immobilization, bolus range shifting, and other functions into one single patient-specific structure. In this first step, a set of 3D printed materials is characterized in detail, in terms of structural and radiological properties, elemental composition, directional dependence, and structural changes induced by radiation damage. These data will serve as inputs for the design of 3D printed immobilization structure prototypes...
October 2016: Medical Physics
https://www.readbyqxmd.com/read/27776665/image-quality-of-mean-temporal-arterial-and-mean-temporal-portal-venous-phase-images-calculated-from-low-dose-dynamic-volume-perfusion-ct-datasets-in-patients-with-hepatocellular-carcinoma-and-pancreatic-cancer
#19
X Wang, T Henzler, J Gawlitza, S Diehl, T Wilhelm, S O Schoenberg, Z Y Jin, H D Xue, A Smakic
PURPOSE: Dynamic volume perfusion CT (dVPCT) provides valuable information on tissue perfusion in patients with hepatocellular carcinoma (HCC) and pancreatic cancer. However, currently dVPCT is often performed in addition to conventional CT acquisitions due to the limited morphologic image quality of dose optimized dVPCT protocols. The aim of this study was to prospectively compare objective and subjective image quality, lesion detectability and radiation dose between mean temporal arterial (mTA) and mean temporal portal venous (mTPV) images calculated from low dose dynamic volume perfusion CT (dVPCT) datasets with linearly blended 120-kVp arterial and portal venous datasets in patients with HCC and pancreatic cancer...
November 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27762605/variation-in-attenuation-in-l1-trabecular-bone-at-different-tube-voltages-caution-is-warranted-when-screening-for-osteoporosis-with-the-use-of-opportunistic-ct
#20
Hillary W Garner, Michelle M Paturzo, Gabriela Gaudier, Perry J Pickhardt, Daniel E Wessell
OBJECTIVE: The purpose of this study is to investigate the variation in attenuation values (expressed as Hounsfield units) for L1 vertebral body trabecular bone at different tube voltages used in dual-energy CT (DECT) and to remind physicians to consider changes in attenuation values when they approach opportunistic screening for osteoporosis. MATERIAL AND METHODS: Consecutive patients who underwent DECT examination of the abdomen and pelvis for suspected urolithiasis were included in the study...
October 20, 2016: AJR. American Journal of Roentgenology
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