Key result
A transformer-coupled double-tuned quadrature proton/phosphorus birdcage coil enabled the acquisition of clinically useful proton and phosphorus spectra in less than 30 minutes.
A novel transformer-coupled double-tuned birdcage coil allows for efficient and load-independent proton and phosphorus spectroscopy of human muscle at 7 T in under 30 minutes.
One of the major advantages of high field magnets is the increased signal‐to‐noise and spectral resolution for in vivo localized spectroscopy. In muscle studies, for example, the combination of proton and heteronuclear spectroscopy allows quantification of lipid content, fiber orientation, and cellular metabolic status. For clinical utilization it is important that spectra can be acquired in relatively short acquisition times for patient comfort and minimizing the effects of motion. Radiofrequency coils should ideally be fixed tuned and have relatively small effects with loading. Here, the design process and performance of a transformer‐coupled double‐tuned quadrature proton/phosphorus birdcage coil is described. The resulting coil is highly load‐independent in terms of tuning, and despite the intrinsic reduced proton sensitivity compared to a single‐tuned coil, clinically useful proton and phosphorus spectra can be acquired in a total time of less than 30 min.
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Brand et al. (2013) studied this question. Transformer-coupled double-tuned quadrature proton/phosphorus birdcage coil vs. Single-tuned coil was evaluated on Acquisition of clinically useful proton and phosphorus spectra. A transformer-coupled double-tuned quadrature proton/phosphorus birdcage coil enabled the acquisition of clinically useful proton and phosphorus spectra in less than 30 minutes.
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