Abstract #3953

3D k-Space Domain Parallel Transmit Pulse Design

Jun Ma^1,2, Bernhard Gruber^3,4, Xinqiang Yan⁵, and William Grissom²

¹Department of Radiology, Stanford University, Stanford, CA, United States, ²Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, ³A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, United States, ⁴Division MR Physics, Center for Medical Physics and Biomedical Engineering, Medical University Vienna, Vienna, Austria, ⁵Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, United States

Current parallel transmit pulse design is based on a spatial domain formulation that has prohibitive memory and computational requirements when the number of coils or the number of dimensions is large. We previously introduced a k-space domain method that produces a sparse matrix relating any target excitation pattern in k-space to the pulses that produce it, which can be ﬁnely parallelized, has much smaller memory footprint, and can compensate off-resonance. Here we validate the algorithm for 3D inner-volume excitation using a simulated 24-channel transmit array and a SPINS trajectory, with comparisons to conventional iterative spatial domain designs.

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