RETROICOR (Retrospective Image Correction) is a commonly used technique for physiological noise correction, but it may not be optimal in its standard implementation for use in studies of the human spinal cord involving atypical breathing patterns. We test the inclusion of an absolute chest position regressor derived from respiratory belt data, in addition to standard RETROICOR regressors, in modeling fMRI scans of the cervical spinal cord with and without breath-hold challenges. The chest position regressor may be a simple approach towards explaining additional noise variance in spinal cord fMRI data during breath-hold tasks.
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