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https://www.readbyqxmd.com/read/29105487/high-pitch-dual-source-paranasal-sinus-ct-in-agitated-patients-with-maxillofacial-trauma-analysis-of-image-quality-motion-artifacts-and-dose-aspects
#1
Claudia Frellesen, Julian L Wichmann, Patricia Tischendorf, Jan-Erik Scholtz, Martin Beeres, Thomas J Vogl, Ralf W Bauer
Background Image quality benefits from high-pitch scanning in agitated patients by reducing acquisition time. Purpose To compare image quality and exposure parameters in patients with maxillofacial trauma on second- and third-generation dual-source computed tomography (DSCT). Material and Methods Four groups were compared. Group 1 was examined on second-generation DSCT (120 kV/50 mAs, pitch 3.0). The other three groups were examined on third-generation DSCT. Group 2 was scanned with 120 kV/50 mAs, pitch 2...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29042698/evaluating-low-kv-dual-source-ct-angiography-by-high-pitch-spiral-acquisition-and-iterative-reconstruction-in-pediatric-congenital-heart-disease-patients
#2
Yohei Marukawa, Shuhei Sato, Takashi Tanaka, Akihiro Tada, Yuichiro Kanie, Susumu Kanazawa
We retrospectively evaluated the qualities of pediatric cardiovascular dual-source computed tomography (DSCT) images reconstructed by sinogram-affirmed iterative reconstruction (SAFIRE) and filtered back projection (FBP). We analyzed the cases of 287 congenital heart disease (CHD) patients < 5 years old, referred to our department in August 2013-March 2015. We divided them into two groups according to tube voltage (70 kVp, n=147; 80 kVp, n=140). All images were acquired by a CARE kV system and reconstructed by FBP and SAFIRE...
October 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/29042577/dual-source-computed-tomography-for-evaluating-pulmonary-artery-and-aorta-in-pediatric-patients-with-single-ventricle
#3
Meng-Xi Yang, Zhi-Gang Yang, Yi Zhang, Ke Shi, Hua-Yan Xu, Kai-Yue Diao, Ying-Kun Guo
To explore the accuracy of main pulmonary artery (MPA) and ascending aorta (AAO) image evaluation in pediatric patients with single ventricle (SV) by comparing dual-source computed tomography (DSCT) with echocardiography. Thirty-one children with SV were retrospectively enrolled. The stenosis, dilation, and location of MPA and AAO were independently evaluated by DSCT and echocardiography. The accompanying arterial malformations were also assessed by DSCT. For 17 patients undergoing cardiac catheterization, the DSCT-based diameters of MPA and AAO were correlated with their pressures as measured by catheterization...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28943454/coronary-artery-calcium-quantification-on-first-second-and-third-generation-dual-source-ct-a-comparison-study
#4
Marleen Vonder, Gert Jan Pelgrim, Sèvrin E M Huijsse, Holger Haubenreisser, Mathias Meyer, Peter M A van Ooijen, Matthijs Oudkerk, Thomas Henzler, Rozemarijn Vliegenthart
BACKGROUND: Differences in coronary artery calcium (CAC) quantification of successive CT systems of one vendor could impact results of CAC screening and progression studies. The purpose of this study is to compare CAC quantification between three generations of dual-source computed tomography (DSCT) systems. METHODS: Three DSCT generations were used to repeatedly scan an anthropomorphic chest phantom and three inserts. The first and second insert contained 100 small and nine large calcifications, respectively, to determine detectability, and the Agatston and (calibrated) mass score, respectively...
September 8, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28933350/locally-linear-constraint-based-optimization-model-for-material-decomposition
#5
Qian Wang, Yining Zhu, Hengyong Yu
Dual spectral computed tomography (DSCT) has a superior material distinguishability than the conventional single spectral computed tomography (SSCT). However, the decomposition process is an illposed problem, which is sensitive to noise. Thus, the decomposed image quality is degraded, and the corresponding signal-to-noise ratio (SNR) is much lower than that of directly reconstructed image of SSCT. In this work, we establish a locally linear relationship between the decomposed results of DSCT and SSCT. Based on this constraint, we propose an optimization model for DSCT and develop an iterative method with image guided filtering...
October 19, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28927299/evaluation-of-image-quality-and-radiation-dose-of-abdominal-dual-energy-ct
#6
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/28835990/cerebellar-compartments-for-the-processing-of-kinematic-and-kinetic-information-related-to-hindlimb-stepping
#7
M S Valle, G Bosco, R E Poppele
We previously showed that proprioceptive sensory input from the hindlimbs to the anterior cerebellar cortex of the cat may not be simply organized with respect to a body map, but it may also be distributed to multiple discrete functional areas extending beyond classical body map boundaries. With passive hindlimb stepping movements, cerebellar activity was shown to relate to whole limb kinematics as does the activity of dorsal spinocerebellar tract (DSCT) neurons. For DSCT activity, whole limb kinematics provides a solid functional framework within which information about limb forces, such as those generated during active stepping, may also be embedded...
November 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28731362/greater-cognitive-deficits-with-sleep-disordered-breathing-among-individuals-with-genetic-susceptibility-to-alzheimer-s-disease-the-multi-ethnic-study-of-atherosclerosis
#8
Dayna A Johnson, Jacqueline Lane, Rui Wang, Michelle Reid, Ina Djonlagic, Annette L Fitzpatrick, Stephen R Rapp, Luenda E Charles, Ruth O'Hara, Richa Saxena, Susan Redline
RATIONALE: There are conflicting findings regarding the link between sleep apnea and cognitive dysfunction. OBJECTIVE: Investigate associations between indicators of sleep-disordered breathing (SDB) and cognitive function in the Multi-Ethnic Study of Atherosclerosis and assess effect modification by the apolipoprotein ε-4 (APOE-ε4) allele. METHODS: A diverse population (N=1,752) underwent Type 2 in-home polysomnography, which included measurement of % sleep time <90% oxyhemoglobin saturation (%Sat<90%) and apnea-hypopnea index (AHI)...
July 21, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28689328/image-quality-of-coronary-arteries-on-non-electrocardiography-gated-high-pitch-dual-source-computed-tomography-in-children-with-congenital-heart-disease
#9
Yuichiro Kanie, Shuhei Sato, Akihiro Tada, Susumu Kanazawa
This study aimed to evaluate image quality of coronary artery imaging on non-electrocardiography (ECG)-gated high-pitch dual-source computed tomography (DSCT) in children with congenital heart disease (CHD) and to assess factors affecting image quality. We retrospectively reviewed the records of 142 children with CHD who underwent non-ECG-gated high-pitch DSCT. The subjective image quality of the proximal coronary segments was graded using a five-point scale. A score <3 represented a non-diagnostic image...
July 8, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28677055/improved-assessment-of-mediastinal-and-pulmonary-pathologies-in-combined-staging-ct-examinations-using-a-fast-speed-acquisition-dual-source-ct-protocol
#10
Franziska M Braun, Veronica Holzner, Felix G Meinel, Marco Armbruster, Martina Brandlhuber, Birgit Ertl-Wagner, Wieland H Sommer
OBJECTIVES: To demonstrate the feasibility of fast Dual-Source CT (DSCT) and to evaluate the clinical utility in chest/abdomen/pelvis staging CT studies. METHODS: 45 cancer patients with two follow-up combined chest/abdomen/pelvis staging CT examinations (maximally ±10 kV difference in tube potential) were included. The first scan had to be performed with our standard protocol (fixed pitch 0.6), the second one using a novel fast-speed DSCT protocol (fixed pitch 1...
December 2017: European Radiology
https://www.readbyqxmd.com/read/28669428/preoperative-evaluation-of-anomalous-pulmonary-venous-connection-using-dual-source-computed-tomography-comparison-with-echocardiography
#11
Li Jiang, Lin-Jun Xie, Zhi-Gang Yang, Ke Shi, Hua-Yan Xu, Rui Li, Kai-Yue Diao, Ying-Kun Guo
PURPOSE: To evaluate the image features and diagnostic agreement for anomalous pulmonary venous connection (APVC) by dual-source computed tomography (DSCT) before surgery when compared with trans-thoracic echocardiography (TTE). MATERIALS AND METHODS: A total of one hundred and twenty-three patients were enrolled in this study. The associated malformation was analyzed between 39 total anomalous pulmonary venous connections (TAPVC) and 84 partial anomalous pulmonary venous connections (PAPVC)...
September 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28629567/ct-coronary-calcium-scoring-with-tin-filtration-using-iterative-beam-hardening-calcium-correction-reconstruction
#12
Christian Tesche, Carlo N De Cecco, U Joseph Schoepf, Taylor M Duguay, Moritz H Albrecht, Domenico De Santis, Akos Varga-Szemes, Virginia W Lesslie, Ullrich Ebersberger, Richard R Bayer, Christian Canstein, Ellen Hoffmann, Thomas Allmendinger, John W Nance
OBJECTIVES: To investigate the diagnostic accuracy of CT coronary artery calcium scoring (CACS) with tin pre-filtration (Sn100kVp) using iterative beam-hardening correction (IBHC) calcium material reconstruction compared to the standard 120kVp acquisition. BACKGROUND: Third generation dual-source CT (DSCT) CACS with Sn100kVp acquisition allows significant dose reduction. However, the Sn100kVp spectrum is harder with lower contrast compared to 120kVp, resulting in lower calcium score values...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28550355/coronary-computed-tomography-angiography-using-128-slice-dual-source-computed-tomography-in-patients-with-severe-calcification
#13
Suguru Sato, Yosuke Horii, Norihiko Yoshimura, Takuya Yagi, Hidefumi Aoyama
PURPOSE: To compare coronary computed tomography angiography (CTA) and coronary angiography (CAG) with regard to luminal graphic definition of calcified segments using 128-slice dual-source computed tomography (DSCT), specifically for patients with an Agatston score >400. MATERIALS AND METHODS: Of 1148 consecutive patients who underwent coronary CTA using a 128-slice DSCT, 132 subjects had severe calcification with an Agatston score >400. Thirty-nine of the 132 patients who had undergone CAG within 3 months before or after coronary CTA were included...
August 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28529682/segmentations-of-the-cartilaginous-skeletons-of-chondrichthyan-fishes-by-the-use-of-state-of-the-art-computed-tomography
#14
Andrew D McQuiston, Callie Crawford, U Joseph Schoepf, Akos Varga-Szemes, Christian Canstein, Matthias Renker, Carlo N De Cecco, Stefan Baumann, Gavin J P Naylor
AIM: To apply dual-source multidetector computed tomography (DSCT) scanning technology in conjunction with computationally assisted segmentation in order to explore and document skeletal variation that has occurred over the course of evolution. METHODS: We examined 4 divergent species of elasmobranchs with high-resolution 3(rd) generation DSCT. The formalin prepared species examined were: Aptychotrema vincentiana, Mitsukurina owstoni, Negaprion brevirostris and Dactylobatus armatus...
April 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28506470/coronary-ct-angiography-in-the-emergency-department-utilizing-second-and-third-generation-dual-source-ct
#15
Nandini M Meyersohn, Balint Szilveszter, Pedro V Staziaki, Jan-Erik Scholtz, Richard A P Takx, Udo Hoffmann, Brian B Ghoshhajra
BACKGROUND: Coronary computed tomography angiography (coronary CTA) allows efficient triage of low to intermediate risk patients with suspected acute coronary syndrome (ACS) in the emergency department (ED). Techniques for coronary CTA acquisition in the ED continue to evolve with the establishment of standardized scan protocols and the introduction of newer generations of CT hardware. OBJECTIVES: To evaluate qualitative and quantitative image quality and radiation dose exposure of coronary CTA acquired on 2nd versus 3rd generation dual source CT (DSCT) scanners using a standardized institutional scan protocol designed for the ED...
July 2017: Journal of Cardiovascular Computed 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
#16
COMPARATIVE STUDY
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...
June 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28440669/can-multiphase-dynamic-ct-angiography-provide-a-better-assessment-of-aortic-dissection-compared-with-the-standard-triphasic-protocol
#17
Chun-Yan Lu, Yi-Ke Diao, Ying-Qiang Guo, Xiao-Hui Zhang, Hong-Li Bai, Zhen-Lin Li
Background Acute aortic dissection (AD) is a life-threatening medical emergency. It has been debated whether the multiphase dynamic computed tomography angiography (CTA) protocol is superior to the standard triphasic protocol for revealing the characteristics of AD. Purpose To examine two multiphase dynamic protocols, Dynamic four-dimensional (4D) CTA using the shuttle mode and Flash 4D CTA using the high-pitch mode for the assessment of AD and to compare them with the standard triphasic protocol. Material and Methods A total of 54 consecutive patients were randomly and equally assigned to three groups and scanned with a second-generation DSCT scanner...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28431860/predictive-value-of-perfusion-defects-on-dual-energy-cta-in-the-absence-of-thromboembolic-clots
#18
Richard A P Takx, Thomas Henzler, U Joseph Schoepf, Thomas Germann, Stefan O Schoenberg, Aysel Shirinova, Ralf W Bauer, Claudia Frellesen, Long Jiang Zhang, John W Nance, Christian Fink, Paul Apfaltrer
BACKGROUND: To determine the predictive value of volumetrically measured lung perfusion defects (PDvol) and right ventricular dysfunction on dual-energy computed tomography angiography (DE-CTA) for predicting all cause mortality in patients suspected of pulmonary embolism (PE) but without evident thromboembolic clot on CTA. METHODS: 448 patients underwent DE-CTA on a 64-channel DSCT system between January 2007 and December 2012 for suspected PE, of which 115 were without detectable thromboembolic clot on CTA...
April 18, 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28397443/an-evaluation-of-dual-source-computed-tomography-used-with-the-de-weert-classification-to-detect-vulnerable-plaque-using-ivus-virtual-histology-as-a-standard-of-reference
#19
Bartosz Dołęga-Kozierowski, Piotr Klimeczek, Michał Lis, Róża Krycińska, Anna Chrapusta, Urszula Zaleska-Dorobisz, Jerzy Garcarek, Wojciech Witkiewicz
BACKGROUND: One of the main risk factors for cerebral ischemic events is atherosclerotic disease of the internal carotid artery (ICA). Nowadays, increasing attention is being paid to the relationship between the morphological features of atherosclerotic plaque and the occurrence of stroke. Several studies have demonstrated that the presence of specific vulnerable plaque types, with a large lipid core and thin fibrous cap, can be used as an independent risk predictor of cerebral ischemic events...
January 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28381486/musculoskeletal-geometry-accounts-for-apparent-extrinsic-representation-of-paw-position-in-dorsal-spinocerebellar-tract
#20
Raeed H Chowdhury, Matthew C Tresch, Lee E Miller
Proprioception, the sense of limb position and motion, arises from individual muscle receptors. An important question is how and where in the neuroaxis our high level "extrinsic" sense of limb movement originates. In the 1990s, a series of papers detailed the properties of neurons in the dorsal spinocerebellar tract (DSCT) of the cat. Despite their direct projections from sensory receptors, it appeared that half of these neurons had consistent, high-level tuning to paw position rather than to joint angles (or muscle lengths)...
July 1, 2017: Journal of Neurophysiology
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