Coronary artery motion during the cardiac cycle and optimal ECG triggering for coronary artery imaging

Investigative Radiology
B LuM J Budoff

Abstract

Our purpose was to investigate the motion characteristics of the coronary arteries and determine optimal electrocardiographic (ECG) trigger time during the cardiac cycle to minimize motion artifacts. Contrast-enhanced multislice movie studies of electron beam tomography (EBT) images were performed on 70 subjects. The EBT datasets, which covered an entire cardiac cycle at 58-ms intervals, were acquired for a short-axis view of the heart with ECG triggering. The pixel values along x and y axes were measured at multiple intervals during the cardiac cycle to establish the motion distance and velocity of three major coronary arteries. Coronary artery motion varied greatly throughout the cardiac cycle in three major coronary arteries and increased with the patient's baseline heart rate. The greatest and lowest velocities of coronary arterial movement during the cardiac cycle were determined. Based on the lowest velocity of right coronary artery movement during the cardiac cycle, the optimal ECG trigger times were located at approximately 35% (31.4%-37.6%) or 70% (68.7%-71.4%) of the R-R interval in patients whose resting heart rate was < or =70 beats per minute (bpm); at 50% (47.2%-61.1%) of the R-R interval in the 71- to 100-bpm gro...Continue Reading

References

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Citations

Jan 16, 2007·European Journal of Nuclear Medicine and Molecular Imaging·Oliver GaemperliPhilipp A Kaufmann
Jul 20, 2007·European Radiology·Lotus DesbiollesHatem Alkadhi
Mar 12, 2009·European Radiology·Balazs RuzsicsU Joseph Schoepf
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