The partial volume helmet coil is the intermediate coil type between surface coil and volume coil in terms of SNR and B1 uniformity. The helmet coil was introduced to increase the filling factor leading to increasing SNR. In this study, we modified the helmet coil geometry by inserting additional ring to achieve a dual resonance, which is tuned for 1H/31P. The feasibility of dual-tuned helmet coil was evaluated by simulation and MR measurement, and the results were compared with those acquired by commercial single- and dual-tuned birdcage coils.
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