Fig. 9:

Binning into cardiac and respiratory phases. We demonstrate that the reconstructed ungated image series can easily be converted to a gated series of images if desired. For this purpose, the 2^nd and 3^rd eigen-vectors of the estimated Laplacian matrix are used as an estimate of the respiratory and cardiac phases respectively. The images can then be separated into the desired number of cardiac and respiratory bins. Here, we demonstrate this on a dataset that has been separated into 8 cardiac and 4 respiratory phases. Representative images from these bins have been shown in the figure. Similar results on an additional dataset are available in the supplementary material.