Influence of light irradiation modalities on light distribution in human whole blood

Xiaosong Li; Gang Cheng; Naiyan Huang; Lei Wang; Fanguang Liu; Ying Gu

doi:10.1117/12.843257

24 February 2010 Influence of light irradiation modalities on light distribution in human whole blood

Xiaosong Li, Gang Cheng, Naiyan Huang, Lei Wang, Fanguang Liu, Ying Gu

Proceedings Volume 7565, Biophotonics and Immune Responses V; 75650H (2010) https://doi.org/10.1117/12.843257
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

To compare the differences of the light distributions in blood with different light irradiation modalities, Monte Carlo simulation was applied. The light distribution of He-Ne laser (632.8nm) in human whole blood was simulated. The diameter of the optic fiber used was 400μm. We referred to the work done by other researchers to determine tissue optical parameters of blood. For the same output laser power of 5mW, our results showed that the highest power density could be more than 6000mW/cm² using flat end optic fiber. But when using optical fiber coupled with cylindrical light diffuser (the length for light emission =3mm), the highest power density was less than 210mW/cm². Increasing the length of light emission could further reduce the highest power density. In summary, the optical fiber coupled with cylindrical light diffuser is a good modality for in vivo light irradiation in whole blood, which can decrease the light intensity and make it more uniformed distributed in blood. It is of great importance to choose the suitable light emission length of optic fiber coupled with cylindrical light diffuser for clinical applications.

Citation Download Citation

Xiaosong Li, Gang Cheng, Naiyan Huang, Lei Wang, Fanguang Liu, and Ying Gu "Influence of light irradiation modalities on light distribution in human whole blood", Proc. SPIE 7565, Biophotonics and Immune Responses V, 75650H (24 February 2010); https://doi.org/10.1117/12.843257

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