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Abstract #0620

MR Barcoding: Gradient-Free MRI Using B1-Selective Parallel Transmission 

Christopher E. Vaughn1,2, Mark A. Griswold3, and William A. Grissom1,2
1Vanderbilt University Institute of Imaging Science, Nashville, TN, United States, 2Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, 3Radiology, Case Western Reserve University, Cleveland, OH, United States

Conventional MR imaging uses linear B0 gradients for spatial encoding, which have high cost and bulk, and lead to patient discomfort via noise and PNS. We introduce MR Barcoding as a silent, low-profile, and low-cost replacement for B0 gradients. The technique is based on non-linear RF magnitude gradients synthesized by an array of conventional transmit coils, combined with B1+-selective Hadamard encoding pulses. A proof-of-principle simulation shows that a 64x64 image could be reconstructed using an MRF model and a sub-30s scan duration. Experimental results at 47.5 mT validate the encoding capabilities of the B1+-selective Hadamard encoding pulses.

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