As the risk of RF heating in UHF MRI due to high specific absorption rate (SAR), recent work to design the coil focused to reduce SAR. In this study, the impact of the geometrical shape of the multi-channel RF head coil on the transmit efficiency (TE) and SAR efficiency (SE) was analyzed. Four different configurations of the head coil were simulated. it is evident from the results that a coil configuration similar to the head shape is required to optimize the TE and SE simultaneously.
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