Comparison of 64-channel and 32-channel head arrays at 7T and 10.5T in full-wave simulation
Bei Zhang1, Jerahmie Radder2, Andrea Grant2, Russell Lagore2, Matt Waks2, Nader Tavaf2, Pierre-francois Van De Moortele2, Gregor Adriany2, Riccardo Lattanzi3, and Kamil Ugurbil2
1Advanced Imaging Research Center, UTSouthwestern Medical Center, Dallas, TX, United States, 2Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, MN, United States, 3Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University Grossman School of Medicine, New York, NY, United States
Idealized analytical electromagnetic (EM) models predict a spatially non-uniform signal-to-noise-ratio (SNR) gain with increasing coil elements and magnetic field strength. Using realistic EM models, we calculated the performance of prototype 32- and 64-channel receive head arrays at 7T and 10.5T using full-wave simulation with a head-mimicking gel phantom. We obtained SNR and g-factor results in agreement with predictions from ultimate intrinsic calculations, showing ~2-fold SNR gains for a large central region for 64 channels at 10.5T vs. 7T, and lower g-factors with the higher field and higher channel counts; peripheral SNR depended on both field magnitude and channel count.
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