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Abstract #4653

Rapid Motion Detection Using Pre-Rotated Baseline Spherical Navigator Echoes

Junmin Liu1,2, Maria Drangova1,2

1Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada; 2Medical Biophysics, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada

A new spherical navigator echo (SNAV) registration method is presented. Our algorithm starts from collecting a set of pre-rotated baseline SNAVs, which randomly and uniformly cover a predetermined rotation range. The rotation angles between a transformed and baseline position are determined by identifying the minimum of a cost function calculated by subtracting the transformed SNAV from the set of pre-rotated baseline SNAVs. Preliminary results demonstrate that accurate translation and rotation parameters can be extracted in less than 50 ms, compared to the 5 seconds required for the previously used iterative registration approaches.