Abstract 1902: Comparison of 256×0.5mm and 64×0.5mm Multidetector Computed Tomography Image Quality and Accuracy in a Custom-Designed, Motion-Simulating Phantom of Coronary Artery Stenosis

BACKGROUND: 256 multidetector computed tomography (256-MDCT) can image the entire heart volume in a single gantry rotation without table movement and therefore may eliminate helical imaging reconstruction artifacts. However, image quality and quantitative accuracy of coronary artery measurements by 256-MDCT relative to 64-MDCT has not been previously evaluated. The purpose of this study was to compare the accuracy and image quality of 256×0.5mm-MDCT versus 64×0.5mm-MDCT using a custom-designed, motion-simulating coronary artery phantom. METHODS: Coronary artery phantoms with various reference diameter (1.5, 2, 3 and 4mm) and stenoses of various magnitude (0.8–3.1mm) and shape (half moon, concentric, eccentric, 0.13–10.2 mm2 in area) were scanned during simulated cardiac motion at 60 bpm using 256-MDCT (ECG-gated non-helical) and 64-MDCT (ECG-gated helical). Vessel diameter and cross-sectional area were measured in a total of 24 stenoses by two observers using multiplanar reformation of MDCT data. RESULTS:...