Abstract #4243

Accelerated 3D coronary MRA using non-rigid motion corrected regularized reconstruction

T. Correia¹, G. Cruz¹, R. M. Botnar¹, and C. Prieto¹

¹Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom

Accelerated 100% scan efficiency whole-heart 3D coronary MR angiography (CMRA) is achieved by combining undersampling and non-rigid motion correction in a unified regularized reconstruction. 3D undersampled CMRA is performed using a golden-step spiral-like Cartesian trajectory. Motion correction is achieved in two steps: beat-to-beat 2D translational correction with motion estimated from interleaved image navigators, and bin-to-bin 3D non-rigid correction with motion estimated from the data itself. A generalized matrix formalism with total variation regularization is used to perform the non-rigid correction directly in the reconstruction. This approach produces good quality images, comparable to those of a navigator-gated approach, but in a ~5x shorter scan time.

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