Abstract #0400
A 32ch combined RF-shim brain array for efficient B0 shimming and RF reception at 3T
Jason P Stockmann 1 , Thomas Witzel 1 , Boris Keil 1 , Azma Mareyam 1 , Jon Polimeni 1 , Cris LaPierre 1 , and Lawrence L Wald 1,2
1
Athinoula A. Martinos Center for Biomedical
Imaging, Department of Radiology, Massachusetts General
Hospital, Charlestown, MA, United States,
2
Harvard
Medical School, Boston, MA, United States
We demonstrate a 32ch integrated RF/multi-coil (MC) shim
array that combines both functions in the same array of
single-turn loops. Placing large arrays of loops as
close as possible to the body maximizes the efficiency
of both RF reception and B0 shimming. The array shows
SNR comparable to a commercial 32ch coil while
generating the needed B0 variation in the body for
high-performance shimming with less than 3 amps per
loop. Off-line shimming of 3T brain inhomogeneity using
acquired shim array field maps mitigates the sinus B0
hot spot and reduces the 20-slice standard deviation
from 74.2 to 44.6 Hz.
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