Fig. 1

Workflow of the present study. From left to right: schematic representation of the measurement, with light injection/collection in/from the sample highlighted by arrows, and light propagation inside the sample depicted as the typical banana shape of the photon paths; DTOFs are recorded and saved as ‘.DAT’ files - the reported DTOF is for 710 nm from the upper arm of one of the subjects; these curves are fitted to an analytical model of photon propagation through diffusive media and absorption and reduced scattering spectra are recovered.