Document Detail

Optimal electrocardiographically triggered phase for reducing motion artifact at electron-beam CT in the coronary artery.
MedLine Citation:
PMID:  11201457     Owner:  NLM     Status:  MEDLINE    
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.
S He; R Dai; Y Chen; H Bai
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Academic radiology     Volume:  8     ISSN:  1076-6332     ISO Abbreviation:  Acad Radiol     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-01-26     Completed Date:  2001-03-22     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9440159     Medline TA:  Acad Radiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  48-56     Citation Subset:  IM    
Department of Radiology, Cardiovascular Institute and Fuwai Hospital, Chinese Academy of Medical Science, Peking Union Medical College, Beijing.
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MeSH Terms
Calcinosis / classification,  radiography*
Coronary Disease / classification,  radiography*
Heart Rate
Middle Aged
Severity of Illness Index
Tomography, X-Ray Computed / methods*

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