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Dual energy CT

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https://www.readbyqxmd.com/read/28927299/evaluation-of-image-quality-and-radiation-dose-of-abdominal-dual-energy-ct
#1
David Schmidt, Marcus Söderberg, Mats Nilsson, Håkan Lindvall, Christina Christoffersen, Peter Leander
Background Dual-energy computed tomography (DECT) has conceptually been known since the late 1970s and commercially available as dual-source CT (DSCT) systems since 2006; however, the technique has not yet seen widespread implementation in routine protocols. Part of the cause for this is likely due to misconceptions about radiation dose and/or image quality when using DECT. Purpose To compare image quality and radiation dose of single-energy CT (SECT) and DECT abdominal examinations obtained in clinical practice on a second generation DSCT...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28924863/evaluation-of-deep-myometrial-invasion-in-endometrial-cancer-patients-is-dual-energy-ct-an-option
#2
Stefania Rizzo, Marco Femia, Davide Radice, Maria Del Grande, Dorella Franchi, Daniela Origgi, Valentina Buscarino, Alberto Mauro, Massimo Bellomi
OBJECTIVES: Assessment of deep (>50%) myometrial invasion by dual-energy CT (DECT) and Trans-Vaginal US (TVUS) in patients with endometrial cancer. METHODS: We retrospectively enrolled patients with endometrial cancer who underwent DECT and TVUS for pre-surgical staging. Three sets of images were evaluated: 70 keV (routine CT images), 50 keV, and iodine-water reconstructions. The gold standard was pathology after surgery. The agreement between the different imaging modalities and the gold standard was estimated...
September 18, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28918335/modern-diagnosis-of-chronic-thromboembolic-pulmonary-hypertension
#3
Aileen Kharat, Anne-Lise Hachulla, Stéphane Noble, Frédéric Lador
Chronic thromboembolic pulmonary hypertension (CTEPH) should be suspected in patients presenting persistent dyspnea three months after a pulmonary embolism or in patients presenting with acute pulmonary embolism and suggestive images on the CT-scan. For these patients, a specific diagnostic work-up should be performed. First step consists of the ventilation/perfusion (V/Q) scan which is a good screening test due to its high sensitivity and high negative predictive value. Pulmonary angiography remains the gold standard approach for the confirmation of the diagnosis and pre-surgical evaluation of CTEPH...
September 9, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28915161/unenhanced-dual-energy-computed-tomography-visualization-of-brain-edema
#4
Mohammed F Mohammed, Olivia Marais, Adam Min, David Ferguson, Sabeena Jalakhan, Faisal Khosa, Michael OʼKeeffe, Tim OʼConnell, Heiko Schmiedeskamp, Bernhard Krauss, Axel Rohr, Savvas Nicolaou
PURPOSE: The aim of this study was to determine whether dual-energy computed tomography (DECT) imaging is superior to conventional noncontrast computed tomography (CT) imaging for the detection of acute ischemic stroke. MATERIALS AND METHODS: This was a retrospective, single-center study of 40 patients who presented to the emergency department (ED) of a major, acute care, teaching center with signs and symptoms of acute stroke. Only those patients who presented to the ED within 4 hours of symptom onset were included in this study...
September 14, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28901619/nonuniqueness-in-dual-energy-ct
#5
Zachary H Levine
PURPOSE: The goal is to determine whether dual-energy computed tomography (CT) leads to a unique reconstruction using two basis materials. METHODS: The beam-hardening equation is simplified to the single-voxel case. The simplified equation is rewritten to show that the solution can be considered to be linear operations in a vector space followed by a measurement model which is the sum of the exponential of the coordinates. The case of finding the concentrations of two materials from measurements of two spectra with three photon energies is the simplest non-trivial case and is considered in detail...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28900555/the-utility-of-dual-energy-computed-tomography-in-musculoskeletal-imaging
#6
REVIEW
Sachin Khanduri, Aakshit Goyal, Bhumika Singh, Mriganki Chaudhary, Tushar Sabharwal, Shreshtha Jain, Hritik Sharma
The objective of this article is to review the mechanisms, advantages and disadvantages of dual energy computed tomography (DECT) over conventional tomography (CT) in musculoskeletal imaging as DECT provides additional information about tissue composition and artifact reduction. This provides clinical utility in detection of urate crystals, bone marrow edema, reduction of beam hardening metallic artifact, and ligament and tendon analysis.
2017: Journal of Clinical Imaging Science
https://www.readbyqxmd.com/read/28899125/reduction-of-metal-artifacts-from-unilateral-hip-arthroplasty-on-dual-energy-ct-with-metal-artifact-reduction-software
#7
Dong Yue, Cheng Fan Rong, Cai Ning, Hu Liang, Liu Ai Lian, Wang Ru Xin, Luo Ya Hong
Background The evaluation of hip arthroplasty is a challenge in computed tomography (CT). The virtual monochromatic spectral (VMS) images with metal artifact reduction software (MARs) in spectral CT can reduce the artifacts and improve the image quality. Purpose To evaluate the effects of VMS images and MARs for metal artifact reduction in patients with unilateral hip arthroplasty. Material and Methods Thirty-five patients underwent dual-energy CT. Four sets of VMS images without MARs and four sets of VMS images with MARs were obtained...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28898127/acute-pulmonary-embolism-retrospective-cohort-study-of-the-predictive-value-of-perfusion-defect-volume-measured-with-dual-energy-ct
#8
Dong Jin Im, Jin Hur, Kyung Hwa Han, Hye-Jeong Lee, Young Jin Kim, Woocheol Kwon, Byoung Wook Choi
OBJECTIVE: The purposes of this study were to investigate dual-energy CT findings predictive of clinical outcome and to determine the incremental risk stratification benefit of dual-energy CT findings compared with CT ventricular diameter ratio in patients with acute pulmonary embolism. MATERIALS AND METHODS: A retrospective evaluation was conducted of the cases of 172 patients with acute pulmonary embolism who underwent dual-energy CT. Ventricular diameter ratio and relative perfusion defect volume were measured...
September 12, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28887761/textural-features-and-suv-based-variables-assessed-by-dual-time-point-18f-fdg-pet-ct-in-locally-advanced-breast-cancer
#9
Ana María Garcia-Vicente, David Molina, Julián Pérez-Beteta, Mariano Amo-Salas, Alicia Martínez-González, Gloria Bueno, María Jesús Tello-Galán, Ángel Soriano-Castrejón
AIM: To study the influence of dual time point 18F-FDG PET/CT in textural features and SUV-based variables and their relation among them. METHODS: Fifty-six patients with locally advanced breast cancer (LABC) were prospectively included. All of them underwent a standard 18F-FDG PET/CT (PET-1) and a delayed acquisition (PET-2). After segmentation, SUV variables (SUVmax, SUVmean, and SUVpeak), metabolic tumor volume (MTV), and total lesion glycolysis (TLG) were obtained...
September 8, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28885130/a-comparison-of-relative-proton-stopping-power-measurements-across-patient-size-using-dual-and-single-energy-ct
#10
Gregory Michalak, Vicki Taasti, Bernhard Krauss, Amanda Deisher, Ahmed Halaweish, Cynthia McCollough
PURPOSE: To evaluate the accuracy and precision across phantom size of a dual-energy computed tomography (DECT) technique used to calculate relative proton stopping power (SPR) in tissue-simulating materials and a silicone implant relative to conventional single-energy CT (SECT). MATERIAL AND METHODS: A 32 cm lateral diameter (CIRS model 062M, Norfolk, Virginia) electron density phantom containing inserts which simulated the chemical composition of eight tissues in a solid-water background was scanned using SECT and DECT...
September 8, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28871983/phase-1-2-study-of-dual-energy-computed-tomography-for-assessment-of-pulmonary-function-in-radiation-therapy-planning
#11
Houda Bahig, Marie-Pierre Campeau, Andréanne Lapointe, Stephane Bedwani, David Roberge, Jacques de Guise, Danis Blais, Toni Vu, Louise Lambert, Carl Chartrand-Lefebvre, Martin Lord, Edith Filion
PURPOSE: To quantify lung function according to a dual-energy computed tomography (DECT)-derived iodine map in patients treated with radiation therapy for lung cancer, and to assess the dosimetric impact of its integration in radiation therapy planning. METHODS AND MATERIALS: Patients treated with stereotactic ablative radiation therapy for early-stage or intensity modulated radiation therapy for locally advanced lung cancer were prospectively enrolled in this study...
October 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28863692/a-hyperspectral-x-ray-computed-tomography-system-for-enhanced-material-identification
#12
Xiaomei Wu, Qian Wang, Jinlei Ma, Wei Zhang, Po Li, Zheng Fang
X-ray computed tomography (CT) can distinguish different materials according to their absorption characteristics. The hyperspectral X-ray CT (HXCT) system proposed in the present work reconstructs each voxel according to its X-ray absorption spectral characteristics. In contrast to a dual-energy or multi-energy CT system, HXCT employs cadmium telluride (CdTe) as the x-ray detector, which provides higher spectral resolution and separate spectral lines according to the material's photon-counter working principle...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28858542/detection-of-myocardial-infarction-using-delayed-enhancement-dual-energy-ct-in-stable-patients
#13
Gaston A Rodriguez-Granillo, Roxana Campisi, Alejandro Deviggiano, Maria N Lopez de Munain, Macarena De Zan, Carlos Capunay, Patricia Carrascosa
OBJECTIVE: The objective of our study was to explore whether delayed enhancement dual-energy CT (DECT) allows the detection of myocardial infarcts in stable patients. SUBJECTS AND METHODS: Patients with known or suspected coronary artery disease clinically referred for myocardial perfusion imaging using SPECT were prospectively included. All patients (n = 34) also underwent stress, rest, and delayed enhancement DECT on a DECT scanner. At SPECT, segments with myocardial infarction (MI) were defined as those with a summed rest score of ≥ 2 in two or more consecutive segments, and a diagnosis of MI was supported by wall motion abnormalities, clinical history, and ECG findings...
August 31, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28856247/quantitative-image-quality-comparison-of-reduced-and-standard-dose-dual-energy-multiphase-chest-abdomen-and-pelvis-ct
#14
Mario Buty, Ziyue Xu, Aaron Wu, Mingchen Gao, Chelyse Nelson, Georgios Z Papadakis, Uygar Teomete, Haydar Celik, Baris Turkbey, Peter Choyke, Daniel J Mollura, Ulas Bagci, Les R Folio
We present a new image quality assessment method for determining whether reducing radiation dose impairs the image quality of computed tomography (CT) in qualitative and quantitative clinical analyses tasks. In this Institutional Review Board-exempt study, we conducted a review of 50 patients (male, 22; female, 28) who underwent reduced-dose CT scanning on the first follow-up after standard-dose multiphase CT scanning. Scans were for surveillance of von Hippel-Lindau disease (N = 26) and renal cell carcinoma (N = 10)...
June 2017: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28855038/-effect-of-scanning-and-reconstruction-parameters-on-three-dimensional-volume-and-ct-value-measurement-of-pulmonary-nodules-a-phantom-study
#15
Datong Su, Lei Feng, Yingjian Jiang, Ying Wang
BACKGROUND: The computed tomography (CT) follow-up of indeterminate pulmonary nodules aiming to evaluate the change of the volume and CT value is the common strategy in clinic. The CT dose needs to considered on serious CT scans in addition to the measurement accuracy. The purpose of this study is to quantify the precision of pulmonary nodule volumetric measurement and CT value measurement with various tube currents and reconstruction algorithms in a phantom study with dual-energy CT...
August 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28844601/thoracic-quantitative-computed-tomography-qct-can-sensitively-monitor-bone-mineral-metabolism-comparison-of-thoracic-qct-vs-lumbar-qct-and-dual-energy-x-ray-absorptiometry-in-detection-of-age-relative-change-in-bone-mineral-density
#16
Song Shou Mao, Dong Li, Younus Saleem Syed, Yanlin Gao, Yanting Luo, Ferdinand Flores, Janis Child, MacKenzie Cervantes, Kamyar Kalantar-Zadeh, Matthew J Budoff
RATIONALE AND OBJECTIVE: Sensitive detection of bone mineral density (BMD) change is a key issue to monitor and evaluate the individual bone health status, as well as bone metabolism and bone mineral status. The ability to use thoracic quantitative computed tomography (QCT) to detect the annual change of BMD remains unclear. We aimed to investigate the sensitivity in detecting age-related bone mineral loss using the thoracic QCT from the electrocardiographically gated heart scans in comparison to whole-body dual-energy X-ray absorptiometry (DXA) and standard lumbar QCT...
August 22, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28842739/exploring-metal-artifact-reduction-using-dual-energy-ct-with-pre-metal-and-post-metal-implant-cadaver-comparison-are-implant-specific-protocols-needed
#17
Ruud H H Wellenberg, Johanna C E Donders, Peter Kloen, Ludo F M Beenen, Roeland P Kleipool, Mario Maas, Geert J Streekstra
OBJECTIVE: To quantify and optimize metal artifact reduction using virtual monochromatic dual-energy CT for different metal implants compared to non-metal reference scans. METHODS: Dual-energy CT scans of a pair of human cadaver limbs were acquired before and after implanting a titanium tibia plate, a stainless-steel tibia plate and a titanium intramedullary nail respectively. Virtual monochromatic images were analyzed from 70 to 190 keV. Region-of-interest (ROI), used to determine fluctuations and inaccuracies in CT numbers of soft tissues and bone, were placed in muscle, fat, cortical bone and intramedullary tibia canal...
August 25, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28842662/low-tube-voltage-liver-mdct-with-sinogram-affirmed-iterative-reconstructions-for-the-detection-of-hepatocellular-carcinoma
#18
B Pregler, L P Beyer, A Teufel, C Niessen, C Stroszczynski, H Brodoefel, P Wiggermann
Aim of this study was to compare low tube voltage computed tomography (80 kV) of the liver using iterative image reconstruction (SAFIRE) with standard computed tomography (120 kV) using filtered back-projection (FBP) for the detection of hepatocellular carcinoma (HCC). 46 patients (43 men) with 93 HCC confirmed by 3 T MRI with Gd-EOB-DPTA, in inconclusive cases combined with contrast-enhanced ultrasound, underwent dual-energy CT. The raw data of the 80 kV tube was reconstructed using the iterative reconstruction algorithm SAFIRE with two strengths (I3 and I5)...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28841925/increasing-role-of-dual-energy-ct-in-noninvasive-vascular-imaging
#19
Klaus D Hagspiel
No abstract text is available yet for this article.
September 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28835993/metastatic-and-non-metastatic-lymph-nodes-quantification-and-different-distribution-of-iodine-uptake-assessed-by-dual-energy-ct
#20
Stefania Rizzo, Davide Radice, Marco Femia, Paolo De Marco, Daniela Origgi, Lorenzo Preda, Massimo Barberis, Raffaella Vigorito, Giovanni Mauri, Alberto Mauro, Massimo Bellomi
OBJECTIVES: To evaluate quantification of iodine uptake in metastatic and non-metastatic lymph nodes (LNs) by dual-energy CT (DECT) and to assess if the distribution of iodine within LNs at DECT correlates with the pathological structure. METHODS: Ninety LNs from 37 patients (23 with lung and 14 with gynaecological malignancies) were retrospectively selected. Information of LNs sent for statistical analysis included Hounsfield units (HU) at different energy levels; decomposition material densities fat-iodine, iodine-fat, iodine-water, water-iodine...
August 23, 2017: European Radiology
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