Figure 4.

(a) Segmentation of left ventricular myocardium (yellow) and other tissue (red) convolved with the spatial response function (SRF) of the marked voxel (nominal: $13.75\times 27.5{\text{mm}}^2$ in-plane). The dashed line shows the isocontour of the SRF at 64 % after filtering. The image depicts a central short axis slice during diastole with a filling factor of 29.2 % for the marked voxel. (b) The myocardial filling factor, i.e. myocardial volume / sensitive voxel volume, for all selected voxels and volunteers. (c) Correlation of the PCr signal (normalized to the untriggered signal) and the filling factor (normalized to the mean over the cardiac cycle) for all volunteers, scan times and voxels. Line depicts linear regression with $r_{\mathrm{s}}=0.69$.