Study on the distribution of SAR and temperature in human brain during radio-frequency cosmetic treatment

Abstract

This paper established a radio-frequency electrode model and human head model used in RF cosmetic instruments. The distribution of electric field strength, a specific absorption rate (SAR), and temperature distribution in the human brain at 1 MHz and 6 MHz were studied and the results compared with the International Commission on Nonionizing Radiation Protection (ICNIRP) guidelines. The results showed that under those two frequencies the maximum value of electric field strength in the human brain was 1.52 V/m and it was about 5.4% of the ICNIRP basic restrictions, the maximum SAR in human brain was about 2:21 ? 10??3 W/kg, which was far less than 2 W/kg of ICNIRP basic restrictions, the maximum temperature of the human brainwas 37:6? located in thewounded skin, which was the same as the normal temperature 37?. Since all the results were within the ICNIRP basic restrictions, the electromagnetic exposure generated by the RF cosmetic electrode will not pose a threat to the human health.

Keywords

• electromagnetic exposure
• human head model
• icnirp guidelines
• radiofrequency cosmetic instruments
• safety assessment