Inter-laboratory comparison of numerical dosimetry for human exposure to 60 Hz electric and magnetic fields

Abstract

In recent years, with the availability of high resolution models of the human body, numerical computations of induced electric fields and currents have been made in more than one laboratory for various exposure conditions. Despite the verification of computational methods, questions are often asked about the reliability of these data. In this paper, computati onal results from two laboratories that presented data in compatible formats are compared, supplemented with additional data from the third laboratory. Two exposures to uniform fields at 60 Hz are evaluated. The human body models used in the computations are different and so are the computation al methods and codes. There are some differences in the conductivity values used for some of the tissues, as well. The results of the comparison confirm that these data are reliable, as the overall agreement is reasonably good and the differences can be rationally explained. This comparison also underscores the importance of accurate data on the dielectric properties of tissues. Bioelectromagnetics 21:167–174, 2000. © 2000 Wiley‐Liss, Inc.

Domain Decomposition for Computing Extremely Low Frequency Induced Current in the Human Body

“…A key point is that each local vector can be easily obtained from the global vector through a linear restriction operator of matrix (2) In the same way, a linear prolongation operator of matrix allows to obtain the global contribution which correspond to each local vector, so that (3) In the case of matching meshes, is a permutation of the matrix , and it can be shown that is simply the transposed matrix of . In the general case of non-matching meshes, each term of the local vector is computed from the global one by using a first-order finite-element interpolation.…”

“…Utah) [3], Univ. Victoria [3], [18], Brook Air Force [18], ZOL [19]) and methods (IM, SPFD Scalar Potential FD TDFD Time Domain FD, FEM).…”

“…Utah) [3], Univ. Victoria [3], [18], Brook Air Force [18], ZOL [19]) and methods (IM, SPFD Scalar Potential FD TDFD Time Domain FD, FEM). In [3] the average value is based of punctual values, whereas in [18] the field is previously averaged over 1 cm ; this may contribute to explain the difference between the reported values.…”

“…Victoria [3], [18], Brook Air Force [18], ZOL [19]) and methods (IM, SPFD Scalar Potential FD TDFD Time Domain FD, FEM). In [3] the average value is based of punctual values, whereas in [18] the field is previously averaged over 1 cm ; this may contribute to explain the difference between the reported values. The maximum values of the electric field have not been compared, on one hand because they are much more sensitive to numerical errors [20], and on the other hand because they are not always available.…”

Domain decomposition for computing extremely low frequency induced current in the human body

“…We simulated the exposure of the human body to a 60 Hz, uniform 1 mT back-to-front magnetic field, and compared the results with the values found in literature [3], [18], [19]. The computational phantom is based on the Visible Human (see Fig.…”