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B0-field inhomogeneities can influence (spectroscopic) image quality of the prostate, causing geometric distortion in diffusion weighted EPI images as well as line broadening in MRSI voxels. We added a 16-element external local shim array around the pelvis to improve B0-field homogeneity within the prostate and evaluated its effects compared to standard shimming in 9 healthy volunteers. Resulting B0-maps showed a comparable or reduced frequency variation across subjects, with a significant decrease of MRSI citrate line widths. DWI did not show a robust effect over the group of subjects.
Tenbergen et al. (Wed,) studied this question.
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