Research on laser induced pain effect

P. Chen; J. R. Wang; Y. C. Li; Z. F. Yang

doi:10.1117/12.870367

8 November 2010 Research on laser induced pain effect

P. Chen, J. R. Wang, Y. C. Li, Z. F. Yang

Proceedings Volume 7845, Optics in Health Care and Biomedical Optics IV; 78451P (2010) https://doi.org/10.1117/12.870367
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

To study 1.06μm laser causing pain in human skin. The skin of human dorsum hand was irradiated by a Nd: YAG laser. The energy of each pulse and whether the subjects felt a painful sensation after each stimulus were recorded. The pain threshold was defined as the laser dose at which the subjects reported a painful sensation to 50% of stimulus deliveries. The pain thresholds were determined under 3 different beam diameter and pulse duration conditions. The influence of skin temperature on the pain caused by laser stimulus was also explored. As the temperature of skin was about 30°C, the pain thresholds were 394mJ/mm², 36.4mJ/mm² and 8.92mJ/mm² respectively under the stimulating condition of 1.20mm beam diameter and 85μs pulse duration, 1.20mm beam diameter and 20ns pulse duration and 2.56mm beam diameter and 20ns pulse duration. Under the first condition, when skin temperature was 25°C and radiant exposure was 383mJ/mm², the probability of laser stimulus causing pain was 16.7%; when skin temperature was 39°C and radiant exposure was 361mJ/mm², the probability was 56.7%. The threshold of 1.06μm laser stimulus causing pain decreases with decreasing pulse duration, increasing beam diameter and skin temperature.

Citation Download Citation

P. Chen, J. R. Wang, Y. C. Li, and Z. F. Yang "Research on laser induced pain effect", Proc. SPIE 7845, Optics in Health Care and Biomedical Optics IV, 78451P (8 November 2010); https://doi.org/10.1117/12.870367

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