A system for in situ S-parameter measurements of MR transmit arrays
Gerd Weidemann 1 , Frank Seifert 1 , Werner Hoffmann 1 , Rainer Seemann 1 , Patrick Waxmann 1 , and Bernd Ittermann 1
Braunschweig und Berlin, Germany
The reflected RF power as a function of steering
conditions and the coupling of coil elements can be
determined from S-parameters of a MR transmit array. We
developed a versatile system for in situ measurements of
S-parameter matrices, which can be used to monitor the
influence of loading conditions or coupling to the coil
environment on the power balance and the coupling of a
pTx coil. For an 8 channel coil the complete S-parameter
matrix can be measured in less than one minute in situ.
Since the system is independent of scanner hardware and
does not interfere with a running sequence it can be
used for monitoring any pTx system in situ, e.g. for the
detection of abnormalities like metallic implants.
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