The human body exposed to a magnetotherapy device magnetic field

Abstract

This paper deals with human exposure to extremely low frequency (ELF) magnetic fields generated by a magnetotherapy device. The problem is twofold, i.e. it implies the assessment of an external ELF magnetic field and other internal parameters related to the human body response to this field (total current, power density, total power). Of particular importance is the current density induced inside the human body as the basic restriction proposed by the relevant international bodies for non-ionizing radiation, such as ICNIRP. ELF magnetic field levels generated from a magnetotherapy device are obtained from measurements. Knowing the external magnetic field generated by a magnet, the circular current density induced in the human body is obtained by the use of the analytical formula arising from the disk model of the human torso. On computing the circular current density, it is possible to assess other parameters of interest related to body response. The obtained values of both the magnetic field and the internal current density are compared to exposure limits in terms of reference levels and basic restrictions proposed by ICNIRP. Keywords: magnetotherapy, human exposure to magnetic fields, disk model of the body, induced current density.

Analysis of Magnetotherapy Device-Induced Fields Using Cylindrical Human Body Model

“…To this end, the disk model of human body [34] has been utilized. The human body exposed to ELF fields due to magnetotherapy device based on the analytical approach has been previously carried out in [17].…”

“…Assuming the exposure of human body to uniform magnetic flux density directed perpendicular to the human body, (B = B z ), the induced current density J ϕ , circulating around the body axis, can be obtained using the following [17]:…”

“…The exposure of humans to ELF magnetic fields generated by magnetotherapy devices has been analyzed in a number of papers including [17][18][19][20][21]. The study in [17] is based on the analytical approach featuring the disk model of the human body, while most often the numerical approach is based on the use of the finite-difference time-domain method [18,19].…”

“…The exposure of humans to ELF magnetic fields generated by magnetotherapy devices has been analyzed in a number of papers including [17][18][19][20][21]. The study in [17] is based on the analytical approach featuring the disk model of the human body, while most often the numerical approach is based on the use of the finite-difference time-domain method [18,19]. In many numerical analyses, the main focus when calculating the induced eddy current distribution is restricted to a particular body part, such as a knee joint [18,19,21] or a forearm [22].…”

“…In many numerical analyses, the main focus when calculating the induced eddy current distribution is restricted to a particular body part, such as a knee joint [18,19,21] or a forearm [22]. The full human body model exposure during the magnetotherapy procedure is used to a lesser extent, as evidenced from the available literature [17].…”