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
radiology, UMC Utrecht, Utrecht, Utrecht,
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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