EMI-Suppressed Gradient-Free Phase-Encoded Imaging at 47.5mT Using an Optimized Square-Root Solenoid for Encoding and a Saddle Coil for Imaging
Sai Abitha Srinivas1,2, Christopher E Vaughn1,2, Jonathan B Martin1,2, and William A Grissom1,2,3,4
1Biomedical Engineering, Vanderbilt University, Nashville, TN, United States, 2Vanderbilt University Institute of imaging science, Nashville, TN, United States, 3Radiology, Vanderbilt University, Nashville, TN, United States, 4Electrical Engineering, Vanderbilt University, Nashville, TN, United States
Traditional B0 gradients have several drawbacks including high acoustic noise, PNS, bulkiness, and high cost. To address this, we demonstrate the use of Bloch-Siegert (BS) RF encoding for phase encoding using an optimized square root solenoid with a Bucking coil for high efficiency encoding and a nested uniform saddle coil for the imaging Tx/Rx coil at 47.5mT, a field strength that is especially attractive due to its low SAR and accessibility. The coil performance was evaluated in simulation and experimentally, and 2D BS phase encoded imaging and reconstructions were performed using optimized ‘U’ shaped BS pulses.
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