Fast Prospective Motion Correction using Directional Couplers as Motion Sensors

Motion is a prevalent issue in MRI. Here, we present a fast prospective motion correction (PMC) algorithm using directional couplers as head-motion sensors. The mean reflectances (per volume) of an 8 channel pTx head coil are modelled to head-position recorded by the systems built-in PMC during a calibration scan. Thereafter, the model is used for motion correction at a per RF pulse temporal resolution. Results indicate partial motion correction with error in correcting fast motions due to the necessary presence of filters to remove unidentified low-frequency noise. Mitigating low-frequency noise contributions would allow for less filtering thereby improving dynamic performance.