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Abstract #4880

Design and Application of a Nested Multi-Channel Sodium/Proton Knee Array at 3T

Ryan Brown 1 , Karthik Lakshmanan 1 , Guillaume Madelin 1 , Gregory Chang 1 , Daniel K Sodickson 1 , Ravinder R Regatte 1 , and Graham C Wiggins 1

1 The Bernard and Irene Schwartz Center for Biomedical Imaging, Dept. of Radiology, New York University School of Medicine, New York, NY, United States

We describe a six channel proton/sodium 3T knee array whose design counteracts low coil-tissue coupling that is characteristic of low-gamma coils and can make the potential gains from a phased array difficult to realize. This issue was addressed by implementing 1) a mechanically flexible former to minimize coil-to-tissue distance and reduce the overall diameter of the array, and 2) a wideband matching scheme that counteracts preamplifier noise degradation caused by resonance frequency splitting and a high loaded coil quality factor. The sodium array provided at least 30% SNR gain over a birdcage coil, while proton channel performance was sufficient for clinical imaging.

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