Fig. 2

Cardiovascular magnetic resonance (CMR) feature-tracking of right atrial (RA) wall motion. Multimodality tissue-tracking software was used to track CMR images in the 4-chamber view to track right atrial wall motion throughout systole and diastole. Phases of the cardiac cycle are presented in temporal order: end-systole (a), mid-diastole (b), end-diastole (c), mid-systole (d). Endocardial and epicardial borders shown in red and cyan, respectively