Evaluation of the Retrospective ECG-gated Helical Scan Using Half-second Multi-slice CT : Motion Phantom Study for Volumetry

Abstract

ECG synchronized technique on multi-slice CT provide the thinner(less 2 mm slice thickness) and faster(0.5sec/rotation) scan than that of the single detector CT and can acquire the coverage of the entire heart volume within one breath-hold. However, temporal resolution of multi-slice CT is insufficient on practical range of heart rate. The purpose of this study was to evaluate the accuracy of volumetry on cardiac function measurement in retrospective ECG-gated helical scan. We discussed the influence of the degradation of image quality and limitation of the heart rate in cardiac function measurement(volumetry) using motion phantom.