Claudia Prieto1,
2, Mariya Doneva3, Muhammad Usman1, Rene M.
Botnar1, Tobias Schaeffter1
1Division
of Imaging Sciences and Biomedical Engineering, King's College London,
London, United Kingdom; 2Escuela de Ingenieria, Pontificia Universidad
Catolica de Chile, Santiago, Chile; 3Philips Research Europe,
Hamburg, Germany
A 3D respiratory motion-corrected reconstruction approach for whole-heart coronary MRA is proposed. This approach achieves 100% scan efficiency by correcting all acquired data directly in the reconstruction after image-based registration of high-resolution undersampled reconstructed data. This is achieved by using a golden-step spiral-like Cartesian acquisition. This phase-encoding scheme ensures a quasi-uniform sampling for any respiratory window and at any breathing position. Motion parameters are estimated from undersampled respiratory-resolved images reconstructed with iterative SENSE and 3D motion correction is performed directly in the reconstruction using a multiple-coils generalized matrix formulation approach. The proposed approach achieves high image quality comparable to that of an 8mm navigator-gated acquisition, which is less efficient.