Evaluation of markerless prospective motion correction for neuroanatomical MRI

International audienceHead-motion is a main cause of artifacts in MRI. The performance of a markerless optical system, which records the subject's face, estimates head-motion, and allows real-time repositioning of the FOV, is evaluated for neuroanatomical MRI. Sets of T1W/T2W-images were collected from 2 subjects instructed to perform different head-motion protocols during the acquisitions. The System performance is evaluated by comparing images with/without motion-correction. The optical system ensures good corrections of head-motions. However, the correction quality depends on the amplitude of the movement, its location in k-space and its nature. Residual effects of large amplitudes/amounts movements may persist on corrected images. Summary of main findings:-Good performance of prospective motion correction for anatomical brain MRI-Correction quality depends on the magnitude of the motion, its location in k-space and its nature-Optical system is more effective at correcting discontinuous than continuous large motions, especially for T2W-MR