One potential method for monitoring the effects of head movement in the scanner consists of using a fixed array of field probes to measure field changes produced outside the head by small changes in head position and angulation. This method has the advantage of requiring neither attachment of markers or probes to the head, nor modification of the imaging sequence. Here, we use realistic head models to simulate the external field changes produced by typical head movements in a 7T scanner and use the results to explore the relationship between the magnetic field perturbation and changes in head position.
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