Abstract #0756

High impedance coils versus conventional loop coils for transmit purposes: a comparison using an eight channel head coil array for 7 Tesla

Carel Costijn van Leeuwen¹, Masoud Mazraeh Mollaei Sharifian², Luca van Dijk¹, Konstantin Simovski², and Alexander J. E. Raaijmakers^1,3

¹Department of radiology, University Medical Center Utrecht, Utrecht, Netherlands, ²Aalto University, Espoo, Finland, ³Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

This study compares high impedance coils to conventional loop coils for transmit purposes at 7 Tesla. A new design for high impedance coils is presented. Two eight-channel head arrays of equal dimensions were created; one using high impedance coils, one with conventional loops. B1 field maps are produced to compare transmit efficiency. Scattering parameters are measured in various loading conditions to compare inter-element coupling. The high impedance coils perform worse in terms of transmit efficiency, and better in terms of coupling.

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