A hybrid dielectric/birdcage double tuned volume resonator for high field MRI

This work describes a new principle to build double tuned volume resonators for high field human imaging by combining a dielectric HEM mode resonator with a birdcage coil. The dielectric resonator acts as the proton transceiver (298 MHz at 7T); the birdcage acts as the sodium transceiver (79 MHz at 7T). By inserting the birdcage into the dielectric coil a double tuned volume coil can be constructed if each of the birdcages rungs is proton frequency trapped. The homogenous B1 fields of the two resonators are preserved in the joint setup. A resonator was constructed to acquire high resolution proton and sodium images of the human wrist.

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