Real-Time Prospective Slice-by-Slice Motion Correction for fMRI in Freely Moving Subjects
Speck O, Zaitsev M
University Hospital Freiburg
Subject motion is still the major source of data quality degradation in functional MRI studies. Most of the established methods correct motion between successive repetitions based on the acquired imaging volumes either retrospectively or prospectively. We introduce a prospective method using external optical tracking that corrects motion on a slice-by-slice basis to continuously follow the motion of the head with the imaging volume. This method enables to acquire fMRI data even in the presence of significant motion during the acquisition of a single volume. The results show that this method is superior to image based correction methods.