4DCT-derived Endocardial Left Ventricular Torsion Correlates With 2D MR Tagging-based Measurements In The Same Subjects

Introduction: We developed a method that uses 4DCT to measure endocardial LV torsion. 4DCT provides high spatial resolution images which allows for visualization of submillimeter features on the endocardial surface with the use of a contrast bolus and blood pool segmentation. These features can serve as fiducial markers which enable motion-tracking by point-cloud registration of the segmented endocardial surface across time. In this study, we compare estimates of torsion in human subjects derived from 4DCT to those obtained from CMR tagging in the same subjects on the same day.