Internal Reference Scans for Artifact Correction in Multi-Shot Segmented EPI Acquisition
Wu G, Li S
Medical College of Wisconsin
Due to the different T1 recoveries and T2* decays, the navigator echo method is not sufficient to reduce the ghost artifact arising from the amplitude and phase discrepancies between segments for the recently proposed turbo segmented imaging (TSI) method. In this study, a new artifact reduction method, which acquires the reference data at the k-space center, is proposed and implemented with a gradient-echo EPI using the TSI technique (TS-EPI). This TS-EPI sequence can be used to obtain high spatial and temporal resolution images with minimal motion artifacts for BOLD and ASL perfusion fMRI studies.