In the context of EPI time series acquisition, fast motion occurring below the Nyquist limit (< 1 TR), present a problem for accurate registration by 3D rigid-body algorithms. A method for temporally upsampling SMS EPI acquisitions is proposed. EPI volumes are splitted into subvolumes according to the temporal acquisition order of SMS and interpolated using a data driven approach based on pairwise affine transforms and linear interpolation. A proof of concept based EPI acquisitions of controlled head choreographies shows that fast motion below the Nyquist rate can be more accurately estimated by our method.
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