Prospective motion correction on diffusion weighted imaging: improving data quality with four radio frequency and gradient pulses updates.

Prospective Motion Correction (PMC) using fast camera-based tracking systems can dramatically increase DWI data quality and may have an important application in populations where movement is hard to prevent. Here we present images acquired with and without intra-sequence PMC from two subjects realizing fast head rotations up to 30°/s. Our results show that the DWI motion sensitivity can be reduced five-fold by applying 3 intra-sequence PMC updates (prior to each of the two refocusing RF pulse and prior to readout).