Abstract #2297

Numerical analysis of different dual-tuned coils for head and knee imaging at 7T

Xinqiang Yan^1,2, Rachelle Crescenzi^1,2, and John C. Gore^1,2

¹Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, ²Radiology and Radiological Science, Vanderbilt University, Nashville, TN, United States

A recurring need in MRI and MRS is to acquire signals from multiple nuclei, 1H proton and 23Na sodium, in the same study. However, a dual-tune volume coil implemented in a single structure leads to SNR and B₁-efficiency penalties for the X-nucleus. We numerically investigated how B₁-fields interact between either a traveling-wave coil existing outside the bore, or a local dipole array, paired with a birdcage 23Na-coil. For applications to head and knee imaging at 7T, an easily-implemented traveling-wave coil may provide sufficient proton signal for anatomical localization and B₀ shimming, without significantly reducing the performance of the X-nucleus coil.

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