Figure 3.

Reconstruction comparisons for coronary MR angiography. (A) Example of reformatted images of the right coronary artery from three healthy subjects acquired at 1.2 mm³ isotropic resolution with a fully sampled whole-heart coronary MR angiography sequence, and with 2 undersampled acquisitions (5- and 9-fold acceleration with variable density sampling), reconstructed using iterative SENSE (itSENSE), wavelet-based compressed sensing reconstruction (CS) and a 3D patch-based approach [3D-PROST (56)]. 3D-PROST provides higher image quality and sharpness (red arrows) than itSENSE and CS for both acceleration factors, achieving similar image quality to the fully sampled reference. Acquisition times (AT) are expressed as min:s. (B) Non-contrast whole-heart sub-millimeter isotropic CMRA images of 53-year-old female patient acquired in 10 min 7 s (5-fold undersampling) and reconstructed with 3D-PROST (56) and non-rigid motion correction (57). Visual comparison with contrast-enhanced Computed Tomography angiography (bottom row) shows good agreement and delineation of the coronary arteries with the free-breathing 3D patch-based motion corrected CMRA framework.