Abstract #0345

Head motion tracking and correction using discrete off-resonance markers (trackDOTS) for high-resolution anatomical imaging at 7T

João Jorge¹, Daniel Gallichan², and José P Marques³

¹Laboratory for Functional and Metabolic Imaging, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, ²Biomedical Imaging Research Center, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, ³Donders Institute, Radboud University, Nijmegen, Netherlands

High-resolution imaging can be significantly affected by subject head motion. Here, we demonstrate the use of discrete off-resonance MR markers (“trackDOTS”) in head motion tracking and correction, for high-resolution anatomical imaging. This approach relies on fast 1D-projection acquisitions (under 50ms per measurement) which do not disturb the water signal. These measurements were incorporated in an MP2RAGE sequence, and a 0.6mm isotropic resolution image was acquired from a healthy subject. Motion timecourses estimated from the trackDOTS positions matched concomitant estimations performed with FatNavs (with deviations of 0.09±0.08mm for translations and 0.20°±0.19° for rotations); MP2RAGE image quality was visibly improved upon correction.

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