MR-Based & Optical Prospective Motion Correction for High Resolution DWI with RS-EPI

Murat Aksoy¹, Melvyn Ooi¹, Samantha J. Holdsworth¹, Rafael O'Halloran¹, Roland Bammer¹

Two prospective motion correction techniques for high resolution diffusion-weighted imaging are compared for readout-segmented (RS) EPI. The first uses 3D registration of low resolution navigator images and the second uses a camera mounted in the scanner bore to correct for motion between k-space segments. Results show that both techniques are effective in eliminating head motion between blinds of the RS-EPI readout, however, optical tracking has advantages because it needs less rescanning, is not vulnerable to intra-volume motion and optically obtained motion estimates are robust to ghosting artifacts.