A ‘pilot-tone’ implementation for 7T head MRI was constructed by broadcasting RF at the appropriate frequency into the scanner room during data acquisition. This signal was demonstrated to enable motion estimation, when calibrated first by correlating measurements with motion estimates from image registration. Subsequently these estimates were compared with others obtained from the iterative DISORDER joint motion estimation & reconstruction method. These independent methods of motion estimation can potentially improve or replace other methods of motion correction at ultra-high field where motion-correction is particularly relevant.
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