Cryogenically-cooled 13C radiofrequency (RF) coils (cryocoils) improve SNR by reducing thermal coil noise compared to room-temperature coils. Coil geometry impacts B1 patterns, which impact experiment design and must be characterized. The sensitivity profiles of a linear and a quadrature coil were characterized with varied RF powers, which is complicated by transmit B1 variation with position and resulting excitation variations. The sensitivity was compared to a room-temperature volume resonator. The quadrature cryocoil configuration offers better B1 uniformity but lower SNR closest to the coil compared to the linear configuration, both have an overall better SNR performance compared to the volume resonator.
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Nagel et al. (2024) studied this question.
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