Figure 4.

The distribution of fluence rate (φ) in tumor for a 1 cm collimated laser beam incident on the skin surface: (a) the ratio of φ and in-air fluence rate (φ_air) versus tumor depth, and (b) the ratio of φ for each condition and the mean fluence rate (φ_mean) versus tumor depth. MC and Fit are the simulations using Monte-Carlo and Eq. (3) for the mean tissue optical properties, μ̄_a = 0.8 ± 0.2 cm⁻¹ and ${\mu }_s^{\prime }=9.3\pm 0.9{\text{ cm}}^{-1}$, respectively.