FID navigators (FIDnavs) encode substantial quantitative rigid-body motion information; however, current implementations require subjects to cooperate for a choreographed training session, which is impractical in many clinical scenarios. We present a new approach that uses simulation of the acquisition physics and effect of motion on the measured FIDnav from each coil. This method is tested in three volunteers scanned at 3T with a 32-channel head coil using a 3D FLASH sequence, each performing a series of repeating motion patterns. Sub-millimeter and sub-degree tracking accuracy was achieved across all volunteers, demonstrating the efficacy of this approach for real-time head motion measurement.
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