A transmit-only/receive-only (TORO) RF system for high-field MRI/MRS applications

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Abstract
The design and operation of a detunable shielded hybrid birdcage RF head coil optimized for human brain imaging at 170 MHz is presented. A high duty‐cycle and rapid‐switching decoupling scheme that allows uniform RF transmission with the head coil and reception with a surface coil within the volume of the head coil is also demonstrated. In addition, the circumscribing hybrid coil can be biased to operate as a conventional transmit/receive head‐coil. Our RF design allows the use of higher sensitivity surface coils or phased‐array coils at very high magnetic fields where body RF resonators are not currently available or whose use is precluded by specific‐absorption ratio restrictions. The design also allows the use of receive‐only coils within head gradient inserts, which normally do not allow transmission with an RF body resonator at any field strength. Magn Reson Med 43:284–289, 2000.

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