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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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