A method for the measurement of the RF power radiated by 7T transmit coils

A method to derive the radiated power of 7T transmit coils is developed and applied to an 8-channel pTx coil to determine the radiated power as a function of steering conditions. It is based on fiber optic time domain E-field vector measurements inside a cylindrical single mode waveguide which mimics the patient tunnel of a typical 7T scanner. The maximum radiated power was found for the CP-mode of the array coil. Although, the portion of the radiated power of the specific coil studied is low it can be higher for other coil designs and will become more prominent for higher fields.

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