Dosimetric Assessment of an in Vitro Exposure Setup for Complex Magnetic Field Reproduction at Intermediate Frequencies

In this paper, a numerical study to assess the dosimetry of an in vitro exposure setup at the intermediate frequencies (IF) is presented and validated. The setup is able to reproduce any complex magnetic induction (B) field waveform using a couple of square coils. In our work, actual signals generated by a 1.5 T magnetic resonance imaging (MRI) apparatus were exploited. Firstly, the simulated B-field time flow within the empty coils was compared with B-field time flow B measured in proximity of an MRI gantry. A good agreement was found thus validating the numerical model. For dosimetry, the weighted peak method, according to ICNIRP 2010 guidelines was applied considering the computed electric (E) field induced in a standard Petri dish. The compliance to the reference limits is respected both for workers and general public as well as for local (central nervous system, CNS) and whole body exposures. Hence, the presented numerical model and the weighted peak index calculation presented in this work, can provide further insight to evaluate exposure to complex field waveforms. Dosimetric evaluations on different biological sample holders (i.e flask, tube) are also under investigation.