Impact of spatiotemporal registration (STR) and retrospective image acceptance/rejection (A/R) on free-breathing DTI of the heart. In the absence of both STR and A/R (first column) the HA, MD and FA maps are extremely noisy. The use of STR without A/R (second column) has little impact. A/R alone (third column) improves image quality substantially, but the maps remain noisy due to misregistration. In contrast, the use of STR followed by A/R (final column) produces high quality maps.