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Abstract #1617

Bilateral shimming of the breast at 7T

Vincent O. Boer 1 , Mariska P. Luttje 2 , Peter R. Luijten 1 , and Dennis W.J. Klomp 1

1 radiology, UMC Utrecht, Utrecht, Utrecht, Netherlands, 2 radiotherapy, UMC Utrecht, Utrecht, Utrecht, Netherlands

Bilateral shimming of the breast puts higher restraints on shimming capabilities as compared to unilateral shimming. Where unilateral shimming can be performed well with 2nd order spherical harmonics, we show that up to fourth order spherical harmonics do not reach the same field homogeneity for bilateral shimming. A midplane shimcoil was designed and used to generate a locally varying field, which was able to compensate the fields in bilateral shimming to a degree beyond that possible with fourth order shimming.

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