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Abstract #1305

Four Channel Transceiver Array for Functional Magnetic Resonance Spectroscopy in the Human Visual Cortex at 9.4 T

Andreas Pfrommer 1 , Nikolai Avdievich 1 , and Anke Henning 1,2

1 Dept. of High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tbingen, Baden-Wrttemberg, Germany, 2 Institute for Biomedical Engineering, University and ETH Zrich, Zrich, Switzerland

RF coils for functional magnetic resonance spectroscopy at ultra-high field strength must be designed with high SNR, high transmit efficiency and optimized to guarantee SAR safety. With numerical EM simulations we compared two possible 4 channel RF coil setups for the application in the human visual cortex. It turned out that overlapping loop elements can provide 12.5 % more B1+ /√SAR(10g) than without overlap for this particular case. Based on the simulation we have constructed a tight fit 4-channel transceiver head phased array. We could reach a B1+ of 63 T in a 12.4x12.4 mm sized voxel in the visual cortex region in a human head-and-shoulder phantom.

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