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Light distribution in intravascular low level laser therapy applying mathematical simulation: a comparative study.

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  • 1Department of Laser Medicine, Chinese PLA General Hospital, Beijing 100853, China.

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Intravascular low level laser therapy (ILLLT) requires better dosimetry. A cylindrical light diffuser on optical fibers improves light distribution, increasing irradiated blood volume and reducing damage compared to flat-end fibers.

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Area of Science:

  • Biomedical Engineering
  • Photomedicine
  • Laser Physics

Background:

  • Intravascular low level laser therapy (ILLLT) has been used for two decades.
  • Dosimetry and light distribution in ILLLT require further fundamental research.
  • Optimizing light delivery is crucial for effective and safe ILLLT.

Purpose of the Study:

  • To compare light distribution during ILLLT using a flat-end fiber versus an optical fiber with a cylindrical light diffuser.
  • To evaluate the impact of different fiber tips on laser energy absorption and distribution in blood.

Main Methods:

  • Monte Carlo modeling was employed to simulate He-Ne laser light distribution (5 mW, 400 µm fiber diameter).
  • Simulations incorporated four tissue optical parameters, focusing on blood optical properties.
  • Light distribution was analyzed for both flat-end and cylindrical diffuser-equipped optical fibers.

Main Results:

  • Blood optical parameters significantly influence laser energy distribution.
  • The flat-end fiber resulted in high power density (>5000 mW/cm²) concentrated in a small area, causing localized absorption by blood cells.
  • The cylindrical light diffuser achieved a lower peak power density (~100 mW/cm²) but irradiated a larger volume of blood cells.

Conclusions:

  • The cylindrical light diffuser is superior for ILLLT, enhancing the volume of irradiated blood.
  • This approach minimizes localized damage to blood cells by distributing laser energy more broadly.
  • Improved dosimetry through optimized light delivery is essential for advancing ILLLT applications.