Accurate B0 field mapping using geometry in bSSFP imaging

Motivation: High fidelity B0 field mapping is often desirable for corrections and contrast, although most methods available require addition image acquisitions. Goal(s): To generate a robust B0 mapping approach that is quantitatively accurate, time-efficient, and allows further understanding of coil information. Approach: The bSSFP geometric solution is leveraged to compute a B0 map from a novel off-resonance parameter calculation. The maps are validated via comparisons to standards and coil element-by-element phase images. Results: Simulation, phantom, and in vivo data confirmed that the method for B0 mapping not only computes quantitatively-accurate field maps, but also permits estimation of other phase contributions including coil-specific phase offsets. Impact: A robust B0 field mapping approach is proposed that facilitates research and clinical efforts seeking imaging techniques that minimize scan time and maximize practical data output.