Inherent and Dynamic B0 Mapping and Deblurring in SENSE Spiral Imaging and Application to Resting-State FMRI

Trong-Kha Truong¹, Nan-kuei Chen¹

Spiral imaging is vulnerable to spatial and temporal variations of the static magnetic field (B₀) caused by susceptibility effects, subject motion, physiological noise, and/or system instabilities, resulting in image blurring. Previously proposed deblurring methods rely on separately acquired B₀ maps, which increases the scan time and precludes the correction of temporal B₀ variations. Here, we propose a novel k-space energy spectrum analysis method that can inherently and dynamically generate a B₀ map from SENSE spiral k-space data at each time point, without requiring any additional data acquisition or pulse sequence modification, and demonstrate its effectiveness in resting-state fMRI experiments.