A system for calibrated measurements of RF electromagnetic fields inside a clinical MR scanner

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 ₁ and B ₁ field sensors using an MR compatible TEM cell and the MR scanner itself was developed. The complex field amplitudes of E ₁ , B ₁ ⁺ and B ₁ were 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 simulations.

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