Cardiac and respiratory self-gating based on PCA of selected points from coil arrays

Motivation: ECG-gating for cardiac MR Imaging may fail, especially at high field, and the conventional self-gating method is insufficient to effectively extract the cardiac signal in 3D cardiac MR cine with high precision (previous precision 20-30ms). Goal(s): Our goal was to achieved a reliable cardiac self-gating technique with the precision of 10ms level. Approach: We proposed a two-step selective PCA self-gating method by first selecting the heart beating or respiration sensitive points and then performing PCA. Results: The proposed method achieved a temporal precision of 11ms for 3D cardiac cine images. Impact: The proposed selective PCA self-gating technique can be applied in poor ECG-gating MR scans, such as patients with hairy chests or obesity, as well as in high-field environments, with a high level of precision down to 11ms.