A dynamic field map correction technique based on reversed-gradient design is introduced to non-Cartesian single-shot fast fMRI to correct the off-resonance artifacts. The field map estimated from dual-TE GRE scan could not capture that from field drift and eddy currents, so the off-resonance artifacts could not be corrected completely. This technique acquires two images with reversed slow-encoding directions in each time frame, which is generally used in EPI, and updates field map iteratively based on conjugate gradient reconstruction. After correction, the off-resonance artifacts are significantly reduced.
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