Christopher W. Ellenor1, Pascal P. Stang1, John M. Pauly1, Greig C. Scott1
1Electrical Engineering, Stanford University, Stanford, CA, United States
We demonstrate the feasibility of offline screening of patients for dangerous interactions between imaging fields and implanted wires. We show that using a standard imaging coil outside the MRI environment, and only a few milliwatts of power, we can measure the impedance spectra of the coil, which shows characteristic distortions in the case of a resonant interaction. Furthermore, we show that this same spectral information can be used to determine the phasing of the drive ports which can null the induced current during a subsequent scan.