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Cardiac Imaging |
1 From the Department of Internal Medicine II, University of Erlangen-Nuernberg, Öestliche Stadtmauerstr 29, D-91054, Erlangen, Germany. Received March 16, 1999; revision requested April 8; final revision received November 15; accepted November 22. Address correspondence to S.A. (e-mail: stephan.achenbach@rzmail.uni-erlangen.de).
PURPOSE: To determine the speed of and changes in the speed of coronary arterial movement during the cardiac cycle with electron-beam computed tomography (CT).
MATERIALS AND METHODS: With electron-beam CT, 20 consecutive cross-sectional images were acquired at the mid right coronary artery (with 50-msec acquisition time, 8-msec intersection delay, 7-mm section thickness, and intravenous administration of 40 mL of contrast agent) in 25 patients. On the basis of the displacement of the left anterior descending, left circumflex, and right coronary arterial cross sections from image to image, movement velocity in the transverse imaging plane was calculated and was correlated with the simultaneously recorded electrocardiogram.
RESULTS: The velocity of in-plane coronary arterial motion varied considerably during the cardiac cycle. Peaks were caused by ventricular systole and diastole and by atrial contraction. The mean velocity was 46.6 mm/sec ± 12.5 (SD). The mean velocity of right coronary arterial movement (69.5 mm/sec ± 22.5) was significantly faster than that of the left anterior descending (22.4 mm/sec ± 4.1) or the left circumflex coronary artery (48.4 mm/sec ± 15.0). The lowest mean velocity (27.9 mm/sec) was at 48% of the cardiac cycle.
CONCLUSION: The lowest velocity of coronary arterial movement, which displays considerable temporal variation, was at 48% of the cardiac cycle.
Index terms: Computed tomography (CT), electron beam, 54.12118 • Coronary vessels, CT, 54.12112, 54.12118 • Coronary vessels, flow dynamics, 54.91 • Heart, CT, 51.12112, 51.12118
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