Models and methods for computational electromagnetic dosimetry

Abstract

The interaction between electromagnetic fields and the human body is a very complicated issue. In most cases it is not possible to measure accurately the electrical response of the human body to external sources. Because of this computational methods are used as an aid when determining the safety levels for human exposure to electromagnetic fields. In this thesis the field distribution caused by various sources is determined in different parts of the human body using detailed and anatomically correct human body models and computational methods. Both the distribution of electric currents induced by low-frequency magnetic fields and the absorption of radio-frequency fields are studied. The accuracy and reliability of the models and methods used is verified by comparing the acquired results to known closed-form solutions and calibration measurements. The obtained results can be utilised in the reliability analysis of computational methods used in electromagnetic dosimetry. Furthermore, some of the results are needed, for example, in the safety guidelines of medical personnel working close to magnetic resonance imaging scanners.