Murat Aksoy1, Melvyn Ooi1, Samantha J. Holdsworth1, Rafael O'Halloran1, Roland Bammer1
1Center for Quantitative Neuroimaging, Department of Radiology, Stanford University, Stanford, CA, United States
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.