Measurement and analysis of electromagnetic fields of pulsed magnetic field therapy systems for private use

摘要

Recently, pulsed magnetic field therapy (PMFT) systems have become available for private use. Although they may be applied without medical supervision, only a little is known about their field quantities. In this study, the spatial distribution and the temporal characteristics of the magnetic flux densities of three PMFT systems, available in Europe, were analysed. In close proximity to the surface, the maxima of the peak magnetic flux densities were 461 νT, 170 νT and 133νT, respectively. At a distance of 30cm above the whole body mat, the peak magnetic flux density was 77νT. The excitation patterns consisted of repeating bursts with carrier frequencies between 210 and 1667Hz. In conclusion, magnetic flux densities were far above International Commission on Non-Ionizing Radiation Protection reference levels. Since these systems are supposed to be medical devices as well as wellness devices, risk analysis of PMFT systems and the effectiveness of these devices need to be investigated in future studies.