Cost Function Guided 3rdorder B0 Shimming for MR Spectroscopic Imaging at 7T

Jeroen Cornelis Willem Siero^1,2, Vincent Oltman Boer², Johannus Marinus Hoogduin^1,2, Peter R. Luijten², Dennis W. Klomp²

A novel shimming method was developed for finding optimal shim fields that minimize B₀ inhomogeneities on a user-defined region of interest while confining the B₀ inhomogeneities outside this ROI. Experiments show that employing this shimming approach, chemical shift imaging (CSI) can be obtained without baseline distortions while maintaining a narrow spectral line width.