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Abstract #0622

Tranceive Phased Array with high Transmit Performance for Human Brain Application at 9.4 T

Nikolai I. Avdievich 1 , Andreas Pfrommer 1 , Jens Hoffmann 1 , Grzegorz L. Chadzynski 1,2 , Klaus Scheffler 1 , and Anke Henning 1,3

1 Max Planck Institute for Biological Cybernetics, Tbingen, Germany, 2 Department of Biomedical Magnetic Resonance, University Hospital Tbingen, Tbingen, Germany, 3 Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland

Surface loop phased arrays have been shown to improve transmit performance and B1 homogeneity for head imaging up to 9.4T. However, transmit arrays enlarged to fit receive arrays often cannot satisfy the requirements in B1 and bandwidth for ultra-high field spectroscopic imaging. We have developed and constructed a tight fit 400MHz 8-channel transceiver array. The array improved transmit efficiency and homogeneity in the axial slab through the phantoms center when used in CP mode. B1+ averaged over the central axial slice measured 55.6 nT/V, which corresponds to 12.4 uT per 1 kW of RF power delivered directly to the array.

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