Abstract #2372

B1+ inhomogeneity mitigation in slice-selective excitation at 7T with a single-channel RF coil augmented by ΔB0 shim array fields

Molin Zhang¹, Georgy Guryev¹, Nick Arango¹, Jason Stockmann^2,3, Jacob White¹, and Elfar Adalsteinsson^1,4,5

¹EECS, MIT, Cambridge, MA, United States, ²Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, ³Department of Radiology, Harvard Medical School, Charlestown, MA, United States, ⁴Harvard-MIT Health Sciences and Technology, MIT, Cambridge, MA, United States, ⁵5 Institute for Medical Engineering and Science, MIT, Cambridge, MA, United States

Synopsis

Keywords: Pulse Sequence Design, RF Pulse Design & FieldsWe explored the utility of shim array fields in the mitigation of in-plane B1+ inhomogeneity for a slice-selective excitation at 7T and achieved better magnitude of transverse magnetization compared with birdcage transmit using conventional single-channel RF excitation. Approximately 2:1 range of B1+ was mitigated, at the cost of increased peak RF power, shim array current demands up to 20 A, and minor out-of-slice sidelobes.

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