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Dual energy CT

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https://www.readbyqxmd.com/read/28527587/relationship-between-carotid-computed-tomography-dual-energy-and-brain-leukoaraiosis
#1
Luca Saba, Roberto Sanfilippo, Antonella Balestrieri, Fulvio Zaccagna, Giovanni Maria Argiolas, Jasjit S Suri, Roberto Montisci
BACKGROUND: The purpose of this study was to assess if there is a correlation between the carotid computed tomography (CT) Hounsfield unit (HU)-based plaque attenuation values measured using dual-energy CT (DECT) scanner and brain leukoaraiosis (LA). METHODS: Fifty consecutive patients (34 males, 16 females; mean age, 69 years; age range, 46-84 years) who underwent carotid CT and brain magnetic resonance imaging were included in the study. CT examinations were performed with a DECT scanner, and LA lesion volume quantification was performed using a semiautomated segmentation technique...
May 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28511327/-determination-of-iodine-content-in-the-left-ventricular-myocardium-of-healthy-subjects-using-dual-source-dual-energy-ct-myocardial-first-perfusion-imaging-a-preliminary-study
#2
Z X Chen, G Wang, L Liang, X R Lu, Q H Guo, Y N Zhai, X N Shi
Objective: To analyze the normal value of the iodine content in the left ventricular myocardium of healthy subjects and to observe if there is a segmental differences on iodine distribution by using the second generation dual-source dual-energy computed tomography myocardial first perfusion imaging. Methods: In this retrospective study, 42 healthy subjects, who admitted to our department between January to June 2016, with normal second generation dual-source dual-energy computed tomography and coronary CT angioghphy (CTA), electrocardiogram (ECG) results, normal cardiac, hepatic, renal function, normal myocardial enzymes results were enrolled, data from 38 out of 42 subjects with satisfactory image quality were analyzed using Siemens Dual Energy-Heart PBV image processing software...
May 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28510483/improvement-in-ventilation-perfusion-mismatch-after-bronchoscopic-lung-volume-reduction-quantitative-image-analysis
#3
Sei Won Lee, Sang Min Lee, So Youn Shin, Tai Sun Park, Sang Young Oh, Namkug Kim, Yoonki Hong, Jae Seung Lee, Yeon-Mok Oh, Sang-Do Lee, Joon Beom Seo
Purpose To evaluate whether bronchoscopic lung volume reduction (BLVR) increases ventilation and therefore improves ventilation-perfusion (V/Q) mismatch. Materials and Methods All patients provided written informed consent to be included in this study, which was approved by the Institutional Review Board (2013-0368) of Asan Medical Center. The physiologic changes that occurred after BLVR were measured by using xenon-enhanced ventilation and iodine-enhanced perfusion dual-energy computed tomography (CT). Patients with severe emphysema plus hyperinflation who did not respond to usual treatments were eligible...
May 16, 2017: Radiology
https://www.readbyqxmd.com/read/28500874/effects-of-intermittent-low-dose-parathyroid-hormone-treatment-on-rapid-mandibular-distraction-osteogenesis-in-rabbits
#4
Bin Ye, Yunfeng Li, Songsong Zhu, Shengjun Sun, Jing Hu, Shujuan Zou
PURPOSE: To determine whether low-dose recombinant human parathyroid hormone (rhPTH) would have a beneficial effect on regenerate healing and surrounding bone in a rabbit model of rapid mandibular distraction osteogenesis (DO). MATERIALS AND METHODS: Twenty-eight rabbits underwent unilateral mandibular lengthening at a rapid rate of 2 mm per day for 5 days. From the first day of DO, the experimental group received daily subcutaneous injections of rhPTH 10 μg/kg for 30 days and the control group received the same volume of saline (n = 14 in each group)...
April 19, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28500383/quantitative-assessment-of-the-degree-of-differentiation-in-colon-cancer-with-dual-energy-spectral-ct
#5
Yang Chuang-Bo, He Tai-Ping, Duan Hai-Feng, Jia Yong-Jun, Zhang Xi-Rong, Ma Guang-Ming, Ren Chenglong, Wang Jun, Yu Yong
OBJECTIVE: To evaluate dual-energy spectral CT imaging in evaluating the degree of differentiation in colon cancer. METHODS: Forty-seven colon cancer patients underwent spectral CT during arterial phase (AP) and portal venous phase (PP), and were characterized pathologically differentiated to well-differentiated (A, n = 18) and poorly differentiated or undifferentiated carcinoma group (B, n = 29). Lesion iodine concentration (IC) was measured and normalized to that of aorta (NIC)...
May 12, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28476243/advanced-dual-energy-ct-applications-for-the-evaluation-of-the-soft-tissues-of-the-neck
#6
REVIEW
R Forghani, S K Mukherji
There are multiple emerging advanced computed tomography (CT) applications for the evaluation of the neck, many based on dual-energy CT (DECT). DECT is an advanced form of CT in which scan acquisition is performed at two different energies, enabling spectral tissue characterisation beyond what is possible with conventional single-energy CT and potentially providing a new horizon for quantitative analysis and tissue characterisation, particularly in oncological imaging. The purpose of this review is to familiarise the reader with DECT principles and review different clinical applications for the evaluation of the soft tissues of the neck...
May 2, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28471869/low-energy-virtual-monochromatic-dual-energy-computed-tomography-images-for-the-evaluation-of-head-and-neck-squamous-cell-carcinoma-a-study-of-tumor-visibility-compared-with-single-energy-computed-tomography-and-user-acceptance
#7
Reza Forghani, Hillary Kelly, Eugene Yu, Manon Belair, Laurent Létourneau-Guillon, Huy Le, Francesca Proulx, Thomas Ong, Xianming Tan, Hugh D Curtin, Mark Levental
OBJECTIVE: Dual-energy computed tomography (CT) 40-keV virtual monochromatic images (VMIs) have been reported to improve visualization of head and neck squamous cell carcinoma, but a direct comparison to single-energy CT (SECT) is lacking, and there is debate regarding subjective user preference. We compared 40-keV VMIs with SECT and performed a subjective evaluation of their utility and acceptability for clinical use. METHODS: A total of 60 dual-energy CT and 60 SECT scans from 2 different institutions were evaluated...
May 2, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28471750/iterative-reconstruction-for-dual-energy-ct-with-an-average-image-induced-nonlocal-means-regularization
#8
Houjin Zhang, Dong Zeng, Jiahui Lin, Hao Zhang, Zhaoying Bian, Jing Huang, Yuanyuan Gao, Shanli Zhang, Hua Zhang, Qianjin Feng, Liang Zhengrong, Wufan Chen, Jianhua Ma
Reducing radiation dose in dual energy computed tomography (DECT) is highly desirable but it may lead to excessive noise in the filtered backprojection (FBP) reconstructed DECT images, which can inevitably increase the diagnostic uncertainty. To obtain clinically acceptable DECT images from low-mAs acquisitions, in this work we develop a novel scheme based on measurement of DECT data. In this scheme, inspired by the success of edge-preserving non-local means (NLM) filtering in CT imaging and the intrinsic characteristics underlying DECT images, i...
May 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28470630/characteristics-of-single-and-dual-photopeak-energy-window-acquisitions-with-thallium-201-iq-spect-ct-system
#9
Takayuki Shibutani, Masahisa Onoguchi, Hiroto Yoneyama, Takahiro Konishi, Shinro Matsuo, Kenichi Nakajima, Seigo Kinuya
OBJECTIVES: Although dual-energy (DE) acquisition with conventional (201)Tl myocardial perfusion SPECT has several advantages such as improved attenuation of the inferior wall and increased acquisition counts, the characteristics of IQ-SPECT have not been fully evaluated. We evaluate the difference of characteristics between single-energy (SE) and dual-energy (DE) imaging using (201)Tl myocardial IQ-SPECT. METHODS: Two myocardial phantoms were created simulating normal myocardium and infarction of the inferior wall...
May 3, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28470402/systematic-radiation-dose-optimization-of-abdominal-dual-energy-ct-on-a-second-generation-dual-source-ct-scanner-assessment-of-the-accuracy-of-iodine-uptake-measurement-and-image-quality-in-an-in-vitro-and-in-vivo-investigations
#10
Sebastian T Schindera, Caroline Zaehringer, Luigia D Errico, Fides Schwartz, Maka Kekelidze, Zsolt Szucs-Farkas, Matthias R Benz
PURPOSE: To assess the accuracy of iodine quantification in a phantom study at different radiation dose levels with dual-energy dual-source CT and to evaluate image quality and radiation doses in patients undergoing a single-energy and two dual-energy abdominal CT protocols. METHODS: In a phantom study, the accuracy of iodine quantification (4.5-23.5 mgI/mL) was evaluated using the manufacturer-recommended and three dose-optimized dual-energy protocols. In a patient study, 75 abdomino-pelvic CT examinations were acquired as follows: 25 CT scans with the manufacturer-recommended dual-energy protocol (protocol A); 25 CT scans with a dose-optimized dual-energy protocol (protocol B); and 25 CT scans with a single-energy CT protocol (protocol C)...
May 3, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28469715/a-review-of-imaging-modalities-in-pulmonary-hypertension
#11
REVIEW
Mona Ascha, Rahul D Renapurkar, Adriano R Tonelli
Pulmonary hypertension (PH) is defined as resting mean pulmonary artery pressure ≥25 mmHg measured by right heart catheterization. PH is a progressive, life-threatening disease with a variety of etiologies. Swift and accurate diagnosis of PH and appropriate classification in etiologic group will allow for earlier treatment and improved outcomes. A number of imaging tools are utilized in the evaluation of PH, such as chest X-ray, computed tomography (CT), ventilation/perfusion (V/Q) scan, and cardiac magnetic resonance imaging...
April 2017: Annals of Thoracic Medicine
https://www.readbyqxmd.com/read/28464949/monosodium-urate-crystal-deposition-associated-with-the-progress-of-radiographic-grade-at-the-sacroiliac-joint-in-axial-spa-a-dual-energy-ct-study
#12
Junqing Zhu, Aiwu Li, Ertao Jia, Yi Zhou, Juan Xu, Shixian Chen, Yinger Huang, Xiang Xiao, Juan Li
BACKGROUND: Previous studies have revealed that ankylosing spondylitis (AS), as the progenitor of axial spondyloarthritis (AxSpA), has been characterized by the insidiously progressive nature of sacroiliitis and spondylitis. Dual-energy computed tomography (DECT) has recently been used to analyse the deposition of monosodium urate (MSU) crystals with higher sensitivity and specificity. However, it remains unclear whether the existence of the MSU crystal deposition detected by DECT at the sacroiliac joint in patients with AxSpA also is associated with the existing structural damage...
May 2, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28458600/diagnostic-performance-of-coronary-ct-angiography-stress-dual-energy-ct-perfusion-and-stress-perfusion-single-photon-emission-computed-tomography-for-coronary-artery-disease-comparison-with-combined-invasive-coronary-angiography-and-stress-perfusion-cardiac
#13
Hyun Woo Chung, Sung Min Ko, Hweung Kon Hwang, Young So, Jeong Geun Yi, Eun Jeong Lee
OBJECTIVE: To investigate the diagnostic performance of coronary computed tomography angiography (CCTA), stress dual-energy computed tomography perfusion (DE-CTP), stress perfusion single-photon emission computed tomography (SPECT), and the combinations of CCTA with myocardial perfusion imaging (CCTA + DE-CTP and CCTA + SPECT) for identifying coronary artery stenosis that causes myocardial hypoperfusion. Combined invasive coronary angiography (ICA) and stress perfusion cardiac magnetic resonance (SP-CMR) imaging are used as the reference standard...
May 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28458443/renal-stone-characterization-using-high-resolution-imaging-mode-on-a-photon-counting-detector-ct-system
#14
A Ferrero, R Gutjahr, A Henning, S Kappler, A Halaweish, D Abdurakhimova, Z Peterson, J Montoya, S Leng, C McCollough
In addition to the standard-resolution (SR) acquisition mode, a high-resolution (HR) mode is available on a research photon-counting-detector (PCD) whole-body CT system. In the HR mode each detector consists of a 2x2 array of 0.225 mm × 0.225 mm subpixel elements. This is in contrast to the SR mode that consists of a 4x4 array of the same sub-elements, and results in 0.25 mm isotropic resolution at iso-center for the HR mode. In this study, we quantified ex vivo the capabilities of the HR mode to characterize renal stones in terms of morphology and mineral composition...
March 9, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28448423/dual-energy-ct-balance-between-iodine-attenuation-and-artifact-reduction-for-the-evaluation-of-head-and-neck-cancer
#15
Jaykumar R Nair, François DeBlois, Thomas Ong, Slobodan Devic, Nada Tomic, Hamed Bekerat, Lorne Rosenbloom, Khalil Sultanem, Reza Forghani
OBJECTIVE: Dual-energy computed tomography high energy virtual monochromatic images (VMIs) can reduce artifact but suppress iodine attenuation in enhancing tumor. We investigated this trade-off to identify VMI(s) that strike the best balance between iodine detection and artifact reduction. METHODS: The study was performed using an Alderson radiation therapy phantom. Different iodine solutions (based on estimated tumor iodine content in situ using dual-energy computed tomography material decomposition) and different dental fillings were investigated...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28448413/the-application-of-iodine-quantitative-information-obtained-by-dual-source-dual-energy-computed-tomography-on-chemoradiotherapy-effect-monitoring-for-cervical-cancer-a-preliminary-study
#16
Changqin Jiang, Pin Yang, Junqiang Lei, Jinkui Li, Kun Yan, Feilong Li, Ruifeng Yan, Lichao Xia
OBJECTIVE: The aim of the study is to investigate the potential contribution of the iodine quantitative parameters of dual-phase dual-energy computed tomography (DECT) scanning for chemoradiotherapy (CRT) response monitoring for cervical cancer. METHODS: Patients who were pathologically certified having cervical cancer and intended for concurrent radiotherapy and chemotherapy were prospectively included in our study. Contrast-enhanced DECT scanning was performed before CRT, which was repeated after 1 month of therapy, using a dual-source CT scanner onset...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28445908/diagnosis-of-pulmonary-artery-embolism-comparison-of-single-source-ct-and-3rd-generation-dual-source-ct-using-a-dual-energy-protocol-regarding-image-quality-and-radiation-dose
#17
Bernhard Petritsch, Aleksander Kosmala, Tobias Gassenmaier, Andreas Max Weng, Simon Veldhoen, Andreas Steven Kunz, Thorsten Alexander Bley
Purpose To compare radiation dose, subjective and objective image quality of 3 rd generation dual-source CT (DSCT) and dual-energy CT (DECT) with conventional 64-slice single-source CT (SSCT) for pulmonary CTA. Materials and Methods 180 pulmonary CTA studies were performed in three patient cohorts of 60 patients each. Group 1: conventional SSCT 120 kV (ref.); group 2: single-energy DSCT 100 kV (ref.); group 3: DECT 90/Sn150 kV. CTDIvol, DLP, effective radiation dose were reported, and CT attenuation (HU) was measured on three central and peripheral levels...
April 26, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28442244/automatic-high-resolution-infarct-detection-using-volumetric-multiphase-dual-energy-ct
#18
Veit Sandfort, Alan C Kwan, Comfort Elumogo, Davis M Vigneault, Rolf Symons, Amir Pourmorteza, Kelly Rice, Cynthia Davies-Venn, Mark A Ahlman, Chia-Ying Liu, Stefan L Zimmerman, David A Bluemke
OBJECTIVES: Late contrast enhancement CT (LCE-CT) visualizes the presence of myocardial infarcts. Differentiation of the contrast-enhanced infarct from blood pool is challenging. We developed a novel method using data from first pass CT angiography (CTA) imaging to enable automatic infarct detection. MATERIALS AND METHODS: A canine model of myocardial infarction was produced in 11 animals. Two months later, first pass CTA (90 kVp) and LCE-CT (dual energy 90 kVp/150 kVp tin filtered) were performed...
April 18, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28440784/dual-energy-ct-characteristics-of-colon-and-rectal-cancer-allows-differentiation-from-stool-by-dual-source-ct
#19
İlknur Özdeniz, İlkay S İdilman, Seyfettin Köklü, Erhan Hamaloğlu, Mustafa Özmen, Deniz Akata, Muşturay Karçaaltıncaba
PURPOSE: We aimed to determine dual-energy computed tomography (DECT) characteristics of colorectal cancer and investigate effectiveness of DECT method in differentiating tumor from stool in patients with colorectal cancer. METHODS: Fifty consecutive patients with colorectal tumors were enrolled. Staging was performed by DECT (80-140 kV) using dual-source CT after rectal air insufflation and without bowel preparation. Both visual and quantitative analyses were performed at 80 kV and 140 kV, on iodine map and virtual noncontrast (VNC) images...
April 25, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28435761/dual-energy-ct-in-head-and-neck-imaging
#20
REVIEW
Elise D Roele, Veronique C M L Timmer, Lauretta A A Vaassen, Anna M J L van Kroonenburgh, A A Postma
PURPOSE OF REVIEW: To explain the technique of Dual-energy CT (DECT) and highlight its applications and advantages in head and neck radiology. RECENT FINDINGS: Using DECT, additional datasets can be created next to conventional images. In head and neck radiology, three material decomposition algorithms can be used for improved lesion detection and delineation of the tumor. Iodine concentration measurements can aid in differentiating malignant from nonmalignant lymph nodes and benign posttreatment changes from tumor recurrence...
2017: Current Radiology Reports
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