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https://www.readbyqxmd.com/read/29769130/diagnostic-accuracy-of-low-dose-dual-source-cardiac-computed-tomography-as-compared-to-surgery-in-univentricular-heart-patients
#1
Narumol Chaosuwannakit, Pattarapong Makarawate
BACKGROUND: To evaluate the ability of low radiation dose dual-source computed tomography (DSCT) to depict the features of morphological univentricular heart and to define accuracy by comparing findings with surgery. METHODS: Low radiation dose dual-source cardiac computed tomography (CCT) of 33 cases of functional univentricular heart preliminary diagnosis by echocardiography compared with the results of surgery were retrospectively analyzed (aged 1 day to 4 years, median 5 months)...
May 16, 2018: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29760475/computed-tomography-for-evaluating-right-ventricle-and-pulmonary-artery-in-pediatric-tetralogy-of-fallot-correlation-with-post-operative-pulmonary-regurgitation
#2
Yue Gao, Zhi-Gang Yang, Ke Shi, Kai-Yue Diao, Hua-Yan Xu, Ying-Kun Guo
Pulmonary regurgitation (PR) is the most common complication after tetralogy of Fallot (TOF) surgical repair, and long-term PR might result in cardiovascular events. The aim of this study was to assess the influence of pre-operative right ventricle (RV) and pulmonary artery (PA) parameters assessed by dual-source computed tomography on post-operative PR. A total of 41 TOF patients who underwent trans-valve surgical repair were retrospectively recruited. The RV and PA parameters evaluated by pre-operative DSCT were compared between the PR and non-PR groups...
May 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29685541/dual-source-computed-tomography-for-quantitative-assessment-of-tracheobronchial-anomaly-from-type-iia-pulmonary-artery-sling-in-pediatric-patients
#3
Ke Shi, Hong-Ling Gao, Zhi-Gang Yang, Hui-Jie Feng, Xi Liu, Ying-Kun Guo
PURPOSE: As an extremely rare abnormity, type IIA pulmonary artery sling (PAS) tracheobronchial anomalies should be differentiated from normal airway for therapeutic decision-making. This study aimed to investigate the quantitative characteristics of type IIA PAS tracheobronchial anomalies using dual-source computed tomography (DSCT). MATERIALS AND METHODS: From January 2009 to December 2016, there were 11 type IIA PAS patients enrolled for analysis and compared with 32 controls...
May 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29571789/virtual-single-source-ct-using-dual-source-acquisition-clinical-applicability-in-run-off-ct-angiography-for-intra-individual-comparison-of-different-scan-protocols
#4
T Werncke, J B Hinrichs, B Alikhani, S Maschke, F K Wacker, B C Meyer
PURPOSE: Virtual single source computed tomography (VSS-CT) acquisition on a dual source CT (DSCT) has been demonstrated to allow for dose-neutral intra-individual comparison of three acquisition protocols at different radiation dose levels (RDL) within one acquisition in a phantom. The purpose of this study was twofold: first to evaluate the applicability of VSS-CT in patients and second to optimize the task-dependent trade-off between radiation dose and image quality of lower extremity CT angiography (run-off CTA)...
April 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29559290/in-a-heartbeat-an-assessment-of-dynamic-dose-variation-to-cardiac-structures-using-dual-source-computed-tomography
#5
Houda Bahig, Jacques de Guise, Toni Vu, Danis Blais, Carl Chartrand-Lefebvre, Nhu Tram Nguyen, Sophie Lavertu, Jean-Pierre Guay, Stephane Bedwani, David Roberge
PURPOSE: To assess radiation dose variation to the left anterior descending artery (LAD), left main coronary artery (LMCA), left ventricle (LV), and whole heart (WH) during the cardiac cycle using dual source computed tomography (DSCT). METHODS AND MATERIALS: The present prospective study included patients with left-side breast cancer planned to undergo tangential radiation therapy. An electrocardiogram-synchronized contrast-injected DSCT scan was obtained with the patient in the treatment position, in deep-inspiration breath-hold, using retrospective sequential acquisition...
January 31, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29516228/contrast-agent-concentration-optimization-in-cta-using-low-tube-voltage-and-dual-energy-ct-in-multiple-vendors-a-phantom-study
#6
Robbert W van Hamersvelt, Nienke G Eijsvoogel, Casper Mihl, Pim A de Jong, Arnold M R Schilham, Nico Buls, Marco Das, Tim Leiner, Martin J Willemink
We investigated the feasibility and extent to which iodine concentration can be reduced in computed tomography angiography imaging of the aorta and coronary arteries using low tube voltage and virtual monochromatic imaging of 3 major dual-energy CT (DECT) vendors. A circulation phantom was imaged with dual source CT (DSCT), gemstone spectral imaging (GSI) and dual-layer spectral detector CT (SDCT). For each scanner, a reference scan was acquired at 120 kVp using routine iodine concentration (300 mg I/ml). Subsequently, scans were acquired at lowest possible tube potential (70, 80, 80 kVp, respectively), and DECT-mode (80/150Sn, 80/140 and 120 kVp, respectively) in arterial phase after administration of iodine (300, 240, 180, 120, 60, 30 mg I/ml)...
March 8, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29492072/correlation-of-dual-source-computed-tomography-dual-energy-imaging-with-pathological-grading-of-lung-adenocarcinoma-and-its-clinical-value
#7
Haifeng Jiang, Xiao Li
Objective: To explore the correlation of dual-source computed tomography (DSCT)/dual-energy imaging with pathological grading of lung adenocarcinoma. Methods: A total of 47 patients with lung adenocarcinoma were selected. Tissues were histopathologically confirmed by routine DSCT scanning and dual-energy enhanced scanning. Arterial-phase and venous-phase iodine distribution images and single-energy images at 40-190 keV were obtained. The region of interest was outlined to obtain CT values...
November 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29452741/magic-angle-in-cardiac-ct-eliminating-clinically-relevant-metal-artifacts-in-pacemaker-leads-with-a-lead-tip-gantry-angle-of-%C3%A2-70%C3%A2
#8
Sebastian D Reinartz, Christiane K Kuhl, Kerstin Fehrenbacher, Andreas Napp
RATIONALE AND OBJECTIVE: To identify the influence of various parameters for reducing artifacts in computed tomography (CT) of commonly used pacemakers or implantable cardioverter-defibrillator (ICD) lead tips. MATERIALS AND METHODS: This ex vivo phantom study compared two CT techniques (Dual-Energy CT [DECT] vs. Dual-Source CT [DSCT]), as well as the influence of incremental alterations of current-time product and pacemaker lead-tip angle with respect to the gantry plane...
February 13, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29404773/dual-energy-ct-a-phantom-comparison-of-different-platforms-for-abdominal-imaging
#9
Thorsten Sellerer, Peter B Noël, Manuel Patino, Anushri Parakh, Sebastian Ehn, Sascha Zeiter, Jasmin A Holz, Johannes Hammel, Alexander A Fingerle, Franz Pfeiffer, David Maintz, Ernst J Rummeny, Daniela Muenzel, Dushyant V Sahani
OBJECTIVES: Evaluation of imaging performance across dual-energy CT (DECT) platforms, including dual-layer CT (DLCT), rapid-kVp-switching CT (KVSCT) and dual-source CT (DSCT). METHODS: A semi-anthropomorphic abdomen phantom was imaged on these DECT systems. Scans were repeated three times for CTDIvol levels of 10 mGy, 20 mGy, 30 mGy and different fat-simulating extension rings. Over the available range of virtual-monoenergetic images (VMI), noise as well as quantitative accuracy of hounsfield units (HU) and iodine concentrations were evaluated...
February 5, 2018: European Radiology
https://www.readbyqxmd.com/read/29389808/cross-modality-accuracy-of-dual-step-prospectively-electrocardiography-triggered-dual-source-computed-tomorgaphy-compared-with-same-day-echocardiography-and-cardiac-magnetic-resonance-imaging-in-the-follow-up-of-heart-transplant-patients
#10
Riccardo Marano, Biagio Merlino, Luigi Natale, Giancarlo Savino, Vincenzo Vingiani, Giuseppe Rovere, Anna Rita Larici, Roberto Iezzi, Nicola Magarelli, Antonella Lombardo, Massimo Pasquale, Riccardo Manfredi
PURPOSE: An accurate evaluation of left ventricular volumes, mass, and ejection fraction (EF) and an early exclusion or detection of significant coronary artery disease or cardiac allograft vasculopathy are mandatory for clinical management and prognosis assessment of heart-transplanted patients (HTP). The purpose of this article was to evaluate the role of dual-step prospective electrocardiography-triggered Dual-Source CT (pECGdual-step-DSCT) in HTP for the assessment of left-ventricular function, in comparison with echocardiography (echo) and cardiac magnetic resonance (CMR) performed on the same day, and of the coronary arteries as well...
January 31, 2018: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/29349698/third-generation-dual-source-ct-enables-accurate-diagnosis-of-coronary-restenosis-in-all-size-stents-with-low-radiation-dose-and-preserved-image-quality
#11
Yuehua Li, Mengmeng Yu, Wenbin Li, Zhigang Lu, Meng Wei, Jiayin Zhang
OBJECTIVES: To investigate the diagnostic performance of low dose stent imaging in patients with large (≥ 3 mm) and small (< 3 mm) calibre stents by third-generation dual-source CT. METHODS: Symptomatic patients suspected of having in-stent restenosis (ISR) were prospectively enrolled. Coronary computed tomography angiography (CCTA) and invasive coronary angiography (ICA) were performed within 1 month for correlation. Binary ISR was defined as an in-stent neointimal proliferation with diameter stenosis ≥ 50%...
January 18, 2018: European Radiology
https://www.readbyqxmd.com/read/29322333/whole-body-ultra-low-dose-ct-using-spectral-shaping-for-detection-of-osteolytic-lesion-in-multiple-myeloma
#12
Saravanabavaan Suntharalingam, Christian Mikat, Axel Wetter, Nika Guberina, Ahmed Salem, Philipp Heil, Michael Forsting, Kai Nassenstein
OBJECTIVES: The aim of this study was to investigate the radiation dose and image quality of a whole-body low-dose CT (WBLDCT) using spectral shaping at 100 kV (Sn 100 kV) for the assessment of osteolytic lesions in patients with multiple myeloma. METHODS: Thirty consecutive patients were retrospectively selected, who underwent a WBLDCT on a third-generation dual-source CT (DSCT) (Sn 100 kV, ref. mAs: 130). They were matched with patients, who were examined on a second-generation DSCT with a standard low-dose protocol (100 kV, ref...
June 2018: European Radiology
https://www.readbyqxmd.com/read/29234912/advanced-ct-acquisition-protocol-with-a-third-generation-dual-source-ct-scanner-and-iterative-reconstruction-technique-for-comprehensive-prosthetic-heart-valve-assessment
#13
Marguerite E Faure, Laurens E Swart, Marcel L Dijkshoorn, Jos A Bekkers, Marcel van Straten, Koen Nieman, Paul M Parizel, Gabriel P Krestin, Ricardo P J Budde
OBJECTIVES: Multidetector CT (MDCT) is a valuable tool for functional prosthetic heart valve (PHV) assessment. However, radiation exposure remains a concern. We assessed a novel CT-acquisition protocol for comprehensive PHV evaluation at limited dose. METHODS: Patients with a PHV were scanned using a third-generation dual-source CT scanner (DSCT) and iterative reconstruction technique (IR). Three acquisitions were obtained: a non-enhanced scan; a contrast-enhanced, ECG-triggered, arterial CT angiography (CTA) scan with reconstructions at each 5 % of the R-R interval; and a delayed high-pitch CTA of the entire chest...
December 12, 2017: European Radiology
https://www.readbyqxmd.com/read/29202750/assessment-of-tetralogy-of-fallot-associated-congenital-extracardiac-vascular-anomalies-in-pediatric-patients-using-low-dose-dual-source-computed-tomography
#14
Bi-Yue Hu, Ke Shi, Yu-Ping Deng, Kai-Yue Diao, Hua-Yan Xu, Rui Li, Zhi-Gang Yang, Ying-Kun Guo
BACKGROUND: To investigate the diagnostic value of dual-source computed tomography (DSCT) in the evaluation of tetralogy of Fallot (TOF)-associated extracardiac vascular abnormalities in pediatric patients compared with transthoracic echocardiography (TTE). METHODS: One hundred and twenty-three pediatric patients diagnosed with TOF were included in this retrospective study. All patients underwent DSCT and TTE preoperatively. All associated extracardiac vascular abnormalities and their percentages were recorded...
December 4, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29155835/assessment-of-transposition-of-the-great-arteries-associated-with-multiple-malformations-using-dual-source-computed-tomography
#15
Lin-Jun Xie, Li Jiang, Zhi-Gang Yang, Ke Shi, Hua-Yan Xu, Rui Li, Kai-Yue Diao, Ying-Kun Guo
PURPOSE: To determine the value of dual-source computed tomography (DSCT) in depicting the morphological characteristics and diagnosing the associated malformations for patients with transposition of the great arteries (TGA) before surgery. MATERIALS AND METHODS: Twenty-five patients with TGA who underwent DSCT and transthoracic echocardiography (TTE) examination were retrospectively reviewed. The morphological types of TGA, the spatial relationship between the pulmonary artery and the aorta, as well as coronary artery-associated abnormalities were assessed by DSCT...
2017: PloS One
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
#16
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
#17
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
#18
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
#19
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...
November 2017: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28933350/locally-linear-constraint-based-optimization-model-for-material-decomposition
#20
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
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