A Novel Broadband Coil for Multinuclear Spectroscopy

RF coils for multinuclear spectroscopy are resonant structures simultaneously tuned at discrete Larmor frequencies. Although popular, coils need to be designed careful to avoid the interference of the different modes for different nuclei species. They also need to be tuned to a drastically different frequency if the nuclei species changes. A novel broadband RF transmitter is developed that utilizes the frequency-independent transverse electromagnetic (TEM) mode of a parallel-plate waveguide. Without using any reactive tuning components, the simple coil structure can function from 100 to 300 MHz. It was applied to 31P spectroscopy of human forearm at 7 Tesla.

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