Comprehensive analysis of transmit performance for an 8-element loop MRI RF transceiver coil at 300 MHz

We numerically investigated the performance of an 8-channel loop-based MRI RF transceiver coil of length 200 mm at 300 MHz. The transceiver was loaded by three human head models placed at five axial positions. For each position and size of the model a set of tune capacitors was obtained, and the robustness and safety of near field generation was evaluated. The transceiver coil showed high robustness, although the safety supervision factor needed to be adjusted for each head position. An optimal head position could be found that did not require transceiver retuning. In this position, a possible reduction of both transmit RF magnetic field and safety excitation efficiency needs to be monitored.