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Abstract #1003

Hybrid motion sensing with a wireless device, self-synchronized to the imaging pulse sequence.

Adam M.J. van Niekerk1, Andre J. W. van der Kouwe1,2,3, and Ernesta M. Meintjes1

1Human Biology, University of Cape Town, Cape Town, South Africa, 2Massachusetts General Hospital, Athinoula A. Martinos Center, Boston, MA, United States, 3Radiology, Harvard Medical School, Boston, MA, United States

Here we combine an accelerometer, angular rate sensor, magnetometer, pickup coil and active marker in a (single) small wireless device. The active marker is used to detect radio frequency pulses, enabling synchronisation to the imaging pulse sequence to within 1 μs accuracy. Sinusoidal waveforms inserted into the imaging pulse sequence (lasting 920 μs) are then measured using the onboard pickup coil to allow real-time position and ADC-gradient timing offsets in all 3 axes. Preliminary results suggest that sub-mm accuracy is possible with very low noise (<0.3 mm) in the raw data captured. The new hardware layout has the potential to enable full prospective motion correction from a single small device that fits on the bridge of the subject's nose.

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