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Abstract #2297

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

Xinqiang Yan1,2, Rachelle Crescenzi1,2, and John C. Gore1,2

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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