Cardiac pulsation, respiration and rigid-body head motion induce changes in relative tissue conductivity. These changes can be detected via the scattering of a parallel transmit RF coil array at 7T, by monitoring the forward and reflected power of each channel, with a 5ms pulse. The time series of the scattering data can be used to detect cardiac and respiratory motion, as well as predict head position using training data. We show that detected heart and respiration rates match those recorded with independent monitoring, and head position may be predicted with reasonable precision, at little extra time cost.
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