RF current measurements in implanted wires in phantoms by fiber optic current clamps

A toroidal time domain current clamp with fiber optic readout was developed for the measurement of the RF currents induced by MR investigations in the protruding ends of implanted conductive structures with diameters up to 10 mm in situ in an MR scanner. Tests with wires inside a body phantom show that even when all parts of the wires are 30 cm outside the body coil of a 3T MR scanner currents of up to 0.1 A are measured at 1 kW transmitter power.

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