| Prospectively ECG-triggered High-pitch Spiral Acquisition for Cardiac CT Angiography in Routine Clinical Practice: Initial Results. | |
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MedLine Citation:
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PMID: 21964497 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE:: This study was conducted to evaluate the mode of application, image quality (IQ), and radiation exposure resulting from introduction of a prospectively electrocardiogram-triggered high-pitch cardiac computed tomography angiography (CTA) acquisition mode into routine clinical practice. MATERIALS AND METHODS:: A total of 42 prospectively triggered cardiac CTAs were conducted on 34 patients (11 female, 23 male; mean age 56±15 y) using a high-pitch mode (pitch 3.4) on a dual-source CT. In 8 of these patients with higher heart rates or occasional premature ventricular contractions, 2 immediately subsequent CTAs were performed ("double flash protocol"). Subjective IQ was assessed for coronary arteries using a 4-point scale (1=unevaluable to 4=excellent). Contrast-to-noise ratio (CNR) was measured in 9 locations. CT Dose Index and dose-length product were obtained, and the patients' effective dose was calculated. RESULTS:: Mean effective doses were 2.6±1.4 mSv (range: 1.1 to 6.4) for the entire cardiac examination and 1.4±0.7 mSv (0.4 to 3.1) for individual high-pitch cardiac CTA. z-coverage ranged from 9.9 cm in a native coronary CTA to 31.4 cm in a bypass graft case. The overall subjective IQ was good to excellent (mean score: 3.5), with 1.5% unevaluable coronary segments. The "double flash protocol" resulted in a fully diagnostic CT study in all cases just after taking both scans into consideration. The mean CNR of all locations was 19.7±2.6. CONCLUSION:: Prospectively electrocardiograph-triggered high-pitch-mode cardiac CTA is a feasible and promising technique in clinical routine, allowing for evaluation of coronaries at good-to-excellent IQ and providing high CNR and minimal radiation doses. The "double flash protocol" might become a more robust tool in patients with elevated heart rates or premature ventricular contractions. |
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Authors:
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Patric Kröpil; Carlos A Rojas; Brian Ghoshhajra; Rotem S Lanzman; Falk R Miese; Axel Scherer; Mannudeep Kalra; Suhny Abbara |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-29 |
Journal Detail:
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Title: Journal of thoracic imaging Volume: - ISSN: 1536-0237 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-10-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8606160 Medline TA: J Thorac Imaging Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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*Department of Diagnostic and Interventional Radiology, University of Duesseldorf, Medical Faculty †Cardiac Imaging Section, Massachusetts General Hospital, Harvard Medical School, Boston, MA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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