Meeting Banner
Abstract #2091

Retrospective Corrections for 3D FMRI: RETROICOR or RETROKCOR?

Rob H.N. Tijssen1, 2, Karla L. Miller1

1FMRIB Centre, Oxford University, Oxford, United Kingdom; 2University Medical Center Utrecht, Utrecht, Netherlands

Recent renewed interest in 3D acquisition methods for FMRI poses the question whether retrospective corrections are better performed in image space (RETROICOR or k-space (RETROKCOR). As 3D acquisitions typically use multi-shot readouts in which the data are combined over a period of several seconds one could argue that a k-space based correction is more appropriate. It was found, however, that RETROICOR performs equally well compared to RETROKCOR suggesting that a single cardiac/respiratory phase for the entire volume is sufficient to generate suitable nuisance regressors for an effective correction of the data.

Keywords

abstract acquisition acquisitions activation added additionally adjacent allow amplification appropriate around assessed assigned assuming better brooks cardiac channel channels choice coil collected comparing complex considerable considerably correction corrections covering create critically dashed defined degrees derivative detected detrimental directly drastically edges either entire equally even exclude expected externally fluctuations generated glover gradient head healthy hence identical imaginary improved in vivo included inclusion incorporated indicating individual individually infinite initially instantaneously instead interactions kingdom like listed little locations magnitude mask matrix medical might miller mimicking model modifications need noise normalized nuisance often optimize oxford performance phantom physiological pipeline pneumatic practical predefined prone proposed random randomly readout readouts real reconstructed reconstruction recorded reduce reduced reduces reduction reductions referred regression regressions regressors removes reported residual resolution respiratory resting retrospective rings sampled segmented series several shot simulated simulation simulations slice space spatial stability statistical sufficient table temporal terms trio typically unaccounted uncertainty unique variance various volume volumes waveform waveforms