The effect of head motion is a significant problem for MRI. Here we present the early stages in the development of a novel device which is able to measure head pose within the scanner. By using a combination of a commercially available 3-axis MEMS accelerometer and an anisotropic magnetoresitive bridge sensor, the orientation of the device is monitored with root-mean-square accuracy of ±0.12° while translation is estimated using voltages induced in a single coil by time-varying magnetic field gradients with an accuracy of ±0.45mm. With further development, this device could be used effectively for prospective and retrospective motion correction.
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