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Fig. 1. —Schematic diagram of two-element capacitively coupled tracking coil. Circuit is tuned to Larmor frequency of system and matched to 50 at tip of catheter using capacitors C_T and C_M. Active detuning via positive-intrinsic-negative (PIN) diode and choke is accomplished remotely. Fifty-ohm microcoaxial cable is used to connect tracking coil to MRI receiver.