Abstract #0062

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 Srinivas^1,2, Christopher E Vaughn^1,2, Jonathan B Martin^1,2, and William A Grissom^1,2,3,4

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

Synopsis

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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