Figure 9.

Coronary MR angiography images in coronal view and reformatted along the left (LAD) and right (RCA) coronary arteries, for one representative healthy subject. Acquisitions were performed with isotropic resolution 1.2 mm³ and 100% respiratory scan efficiency (no respiratory gating). Prospective undersampled acquisitions with acceleration factors 5x (first and second rows) and 9x (third and fourth rows) are shown. Images were reconstructed using zero-filling (ZF), a wavelet-based CS reconstruction (CS), and the Multi-Scale VNN (MS-VNN) reconstruction framework proposed in Fuin et al. (77). Corresponding (consecutively acquired) fully sampled acquisition are shown in the last column for comparison. Multi-scale VNN provides higher image quality than ZF and CS achieving similar image quality to the fully sampled scan. Reconstruction time was ~14 s with MS-VNN and ~5 min with wavelet-based CS.