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MC-calculated ϕ/ϕair as a function of tissue depth (a) and beam radius (b). The ϕ/ϕair was calculated for μa = 0.1 cm−1, μs’ = 10 cm−1, and index of refraction n=1.4 for varying beam radii. Note the exponential decrease with increasing depth. The ϕ/ϕair becomes a constant after the beam radius reaches 2 cm.
