Fig. 2.

(a) Several early phantom creations comprised 70% lipid and 30% water. The fats were butter, olive oil, Crisco, and canola oil (left to right). The first and third phantoms included guar gum as the emulsifier, while the second and fourth utilized soy lecithin. (b) The chemical formula for guar gum34. (c) Data from the diffuse optical spectroscopic imaging system for a mostly lipid (left) and mostly water (right) phantom. The top graph shows the scattering data and fits, while the bottom graph shows the absorption results. Specific peaks for lipids and water can be discerned above 900 nm.