Figure 1

Cardiac MR images in the 4-chamber view (A and B) showing heart volume variations in a patient with ASD. The solid and the dotted white lines represent the heart contours in end-diastole (ED) and end-systole (ES), respectively. Atrioventricular plane displacement (AVPD) caused by longitudinal shortening of the ventricles is marked as a solid white line in ED and a dotted white line in ES.C and D: Short axis images of the same patient. The solid lines represent the epicardial contours of the LV and RV at ED and the dotted lines the epicardial contours at ES. This measurement was done in all short axis slices from the base to the apex. The difference in contours was used to calculate the radial contributions to LVSV and RVSV.