A new RF coil for foot and ankle imaging at 7T MRI
Tales Roberto de Souza Santini1, Junghwan Kim1, Sossena Wood1, Narayanan Krishnamurthy1, Shailesh Raval1, and Tamer Ibrahim1
1University of Pittsburgh, Pittsburgh, PA, United States
7T Foot and ankle has been previously explored1. A four-channel Tic-Tac-Toe (TTT) transmit-only (Tx-only) array2,3 and a four-channel receive-only array were developed and combined to demonstrate the feasiability of high signal-to-noise ratio (SNR) foot and ankle imaging at 7T MRI. The experimental measurements of magnetic field distribution responsible for excitation (B1+) is in agreement with the finite-difference time-domain (FDTD) simulations and the SAR is within the FDA safety limits for the entire lower leg and foot (peak SAR ~ 7W/Kg/10g of tissue, average SAR ~ 1W/Kg/10g of tissue per continuous average field B1+ = 1.97uT). In-vivo proton density TSE and T2DESS images were acquired.
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