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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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