A system for calibrated measurements of RF electromagnetic fields inside a clinical MR scanner
Gerd Weidemann 1 , Isabela Frese 1 , Frank Seifert 1 , Antonino Mario Cassara' 1 , Werner Hoffmann 1 , and Bernd Ittermann 1
Physikalisch-Technische Bundesanstalt (PTB),
For accurate and complete SAR assessment of an RF coil
all E and B field components are required. A system for
the calibration of fiber optic time-domain E
sensors using an MR compatible TEM cell and the MR
scanner itself was developed. The complex field
amplitudes of E
reliably measured in an ASTM body phantom equipped with
provisions for internal and external field sensors.
Utilizing the body coil of a clinical 3 T scanner, the
measurements are used to evaluate the accuracy of EMF
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