A method for the measurement of the RF power radiated by 7T transmit coils
Gerd Weidemann 1 , Frank Seifert 1 , Werner Hoffmann 1 , Harald Pfeiffer 1 , and Bernd Ittermann 1
Braunschweig und Berlin, Germany
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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