Time-domain monitoring of em exposure during medical device testing
Canadian Conference on Electrical and Computer Engineering
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This work presents various probes for measuring radio frequency (RF) electric and magnetic fields for real time measurements of the time-varying RF fields used in MRI. A small single loop (2 cm) and short dipole antenna (2 cm) were developed to monitor the near field magnetic and electric exposure during the medical. Theoretical analysis for each designed probes was performed to convert the real time receive signals to the exposed electric and magnetic field. Probes in this study was tuned and matched at center frequency of 127.6 MHz for 3T MRI scanners to improve the accuracy and sensitivity. Probes were fabricated on a single sided PCB, FR4 of thickness 1.57mm and a copper thickness of 35um.