Fig. 2.

Recovered values of PpIX concentration versus the known PpIX values in the different tissue-simulating phantoms for both the CMOS (a,c) and EMCCD systems (b,d) with integration times of 5 ms per wavelength (a,b) and 20 ms per wavelength (c,d). Measurements were averaged over a 5 by 5 pixel window in the center of the inclusion. Measurements at each PpIX concentration correspond to 9 phantoms with different absorption-scattering combinations at 600 nm ranging from μ_a = 0.02 to 0.06 cm⁻¹ and μ_s’ = 8.7 to 14.5 cm⁻¹. The lines of fit are in red.