Figure 3.

Comparison of images obtained by applying the spectrally constrained direct chromophore reconstruction and the conventional technique of separate wavelength optical properties recovery on measurements from a gelatin phantom with a 25 mm inclusion. The gelatin phantom contained whole blood and TiO₂ for scattering and the inclusion was filled with 4% pig blood and 0.75% Intralipid in buffered saline. (a) The expected images are shown for (i) [Hb_T] (μM), (ii) oxygen saturation S _tO₂(%), (iii) water H₂O(%), (iv) scattering amplitude a and (v) scattering power b, along with (b) conventional technique images and (c) spectral method images.