A method for macroscopic B0 field inhomogeneity compensated SWI using 3D z-shim multi-echo GRE

Susceptibility weighted imaging based on GRE provides enhancement of susceptibility difference which is useful for visualization of vein, micro-hemorrhage and iron deposition. However, GRE suffers from the macroscopic B0 inhomogeneity due to air/tissue boundary and this effect is shown as SNR loss both in magnitude and phase. Here, an improved algorithm for B0 field inhomogeneity compensated SWI, applicable to both magnitude and phase, is proposed using the 3D z-shim mGRE sequence.

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