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Abstract #1775

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

1 Physikalisch-Technische Bundesanstalt, 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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