Abstract #0618

Multi-frequency wave-encoding (mf-wave) on gradients and multi-coil shim-array hardware for highly accelerated acquisition

Jinmin Xu^1,2, Jason Stockmann², Berkin Bilgic², Thomas Witzel^2,3, Jaejin Cho², Congyu Liao², Zijng Zhang^1,2, Huafeng Liu¹, and Kawin Setsompop^2,3,4

¹State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China, ²Department of Radiology, A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ³Harvard Medical School, Boston, MA, United States, ⁴Massachusetts Institute of Technology, Harvard-MIT Health Sciences and Technology, Cambridge, MA, United States

Wave-CAIPI is a parallel imaging technique that can provide high accelerations with negligible g-factor and artifact penalties. However, gradient amplitude & slew rate limits impose a limitation on the amount of wave-encoding and hence the acceleration capability of this technique. In this study, we propose a multi-frequency wave-encoding method (mf-wave) that uses both the gradients and a combined RF and B₀ shim array (32-channel) to perform wave-encoding simultaneously and synergistically at different wave frequencies during the acquisition. We demonstrate that mf-wave can enable ~20-fold acceleration with an acceptable g-factor noise penalty at 3T in vivo.

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