Uncorrected head movement during DWI acquisitions can cause signal dropouts, due to rotation-induced imbalances in gradient moments. Using a fast optical tracking system, signal losses can be reversed by the realignment of the scanner’s gradient axes with the moving head. However, while experimentally the lost signals were recovered to a great extent, the residual gradient moments were larger than anticipated by simulations. We demonstrated that this was due to the discretized nature and asynchronous application of motion updates in relation to the pulse sequence, which can effectively cause bias in the correction of gradient moments.
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