| Optimal electrocardiographically triggered phase for reducing motion artifact at electron-beam CT in the coronary artery. | |
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MedLine Citation:
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PMID: 11201457 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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RATIONALE AND OBJECTIVES: The authors performed this study to (a) investigate coronary movement with electron-beam computed tomography (CT) and (b) find the optimal electrocardiographic (ECG) triggering phase for eliminating motion artifact. MATERIALS AND METHODS: One hundred fifty-one patients without arrhythmia were examined with electron-beam CT. First, movie scans were obtained to create displacement and velocity graphs of coronary artery movement. Then, a volume scan with an exposure time of 100 msec was obtained with various ECG trigger settings. RESULTS: Movement patterns of coronary arteries varied with heart rate. Optimal triggering phase was before atrial systole (near 71% of the R-R interval) when heart rate was slower than 68 beats per minute and at ventricular end systole when heart rate was fast. Rate of severe motion artifacts decreased from 43% to 0% when triggering was altered from 80% of the R-R interval to the individual optimal value. Experimental values of the optimal phase at different heart rates were derived, and severe motion artifact was only 3.0% with these values. CONCLUSION: ECG triggering set according to the heart rate enables a great reduction in motion artifacts at electron-beam CT with a 100-msec exposure time. The results may have implications for magnetic resonance imaging of the coronary artery. |
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Authors:
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S He; R Dai; Y Chen; H Bai |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Academic radiology Volume: 8 ISSN: 1076-6332 ISO Abbreviation: Acad Radiol Publication Date: 2001 Jan |
Date Detail:
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Created Date: 2001-01-26 Completed Date: 2001-03-22 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9440159 Medline TA: Acad Radiol Country: United States |
Other Details:
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Languages: eng Pagination: 48-56 Citation Subset: IM |
Affiliation:
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Department of Radiology, Cardiovascular Institute and Fuwai Hospital, Chinese Academy of Medical Science, Peking Union Medical College, Beijing. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Artifacts Calcinosis / classification, radiography* Coronary Disease / classification, radiography* Electrocardiography* Female Heart Rate Humans Male Middle Aged Severity of Illness Index Tomography, X-Ray Computed / methods* |
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