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DOI: 10.1148/radiol.2242011332
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EKG-triggered CT Data Acquisition to Reduce Variability in Coronary Arterial Calcium Score1

Bin Lu, MD, Nan Zhuang, MD, Song-Shou Mao, MD, Janis Child, RT, Sivi Carson, RT, Hamid Bakhsheshi, RT and Matthew J. Budoff, MD

1 From the Department of Radiology, FuWai Cardiovascular Institute and Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China (B.L., N.Z.); and the Department of Medicine, Division of Cardiology, Harbor-UCLA Medical Center and Saint John’s Cardiovascular Research Center, 1124 W Carson St, RB-2, Torrance, CA 90502 (S.S.M., J.C., S.C., H.B., M.J.B.). Received August 7, 2001; revision requested September 28; revision received November 26; accepted January 18, 2002. Address correspondence to M.J.B. (e-mail: mbudoff@rei.edu).



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  		Figure 1. Bland-Altman plot shows percentage changes in Agatston scores versus the amount of CAC in group 1 (patients who underwent scanning with the use of the optimal EKG triggering protocol).

 


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  		Figure 2. Bland-Altman plot shows percentage changes in Agatston scores versus the amount of CAC in group 2 (patients who underwent scanning with the use of the conventional 80% R-R interval EKG triggering protocol).

 


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  		Figure 3a. Transverse electron-beam CT scans. (a) CAC screening was performed at electron-beam CT with the use of conventional EKG triggering (80% R-R interval during the cardiac cycle). A coronary arterial motion artifact was found in the RCA (arrow). (b) The same patient as in a underwent scanning with the use of optimal EKG triggering. Coronary arterial movements were greatly reduced in the RCA (arrow).

 


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  		Figure 3b. Transverse electron-beam CT scans. (a) CAC screening was performed at electron-beam CT with the use of conventional EKG triggering (80% R-R interval during the cardiac cycle). A coronary arterial motion artifact was found in the RCA (arrow). (b) The same patient as in a underwent scanning with the use of optimal EKG triggering. Coronary arterial movements were greatly reduced in the RCA (arrow).

 




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