Spherical Navigator Registration Using Harmonic Analysis for Prospective Motion Correction

Spherical navigators are an attractive approach to motion compensation in Magnetic Resonance Imaging. Because they can be acquired quickly, spherical navigators have the potential to measure and correct for rigid motion during image acquisition (prospectively as opposed to retrospectively). A limiting factor to prospective use of navigators is the time required to estimate the motion parameters. This estimation problem can be separated into a rotational and translational component. Recovery of the rotational motion can be cast as a registration of functions defined on a sphere. Previous methods for solving this registration problem are based on optimization strategies that are iterative and require k-space interpolation. Such approaches have undesirable convergence behavior for prospective use since the estimation complexity depends on both the number of samples and the amount of rotation. We propose and demonstrate an efficient algorithm for recovery of rotational motion using spheric...

• Type: Conference
• Year: 2005
• Where: IPMI
• Authors: Christopher L. Wyatt, Narter Ari, Robert A. Kraft
• Keywords: IPMI 2005, Medical Imaging, Prospective Motion Compensation, Prospective Motion Correction, Spherical Navigators