Determination of the optical properties of multilayered phantoms by time-resolved reflectance measurements

H. GARCÍA; J. A. POMARICO; D. I. IRIARTE; DIRK GROSENICK; RAINER MACDONALD

Munich

Congreso; European Conference on Biomedical Optics (ECBO 2015); 2015

SPIE

Diffuseoptical imaging of the human brain requires methods to account for the layeredstructure of the head. In this work we present results of experiments performedon layered phantoms in reflection geometry by a time-resolved technique. Weinvestigate structures with two and three layers with the goal to retrieve theoptical properties of the deepest one. Data analysis is based on an existingsolution of the time-resolved diffusion equation for a multilayer cylinder.Using a sufficiently large source-detector separation the absorption andreduced scattering coefficients of the deepest layer can be derived fromtime-resolved reflectance with a deviation of typically not more than 10% fromthe known values