Fig. 1

Graphic representation of the emitted and detected light beam for the CW-NIRS and FD-NIRS techniques. The dark blue line represents the light entering the tissue; the light blue line represents the light that is detected at the detector. a, Intensity of emitted and detected light of the CW-NIRS technique. b, Intensity of the modulated light beam and measured parameters. Image adapted from OxiplexTS™ brochure with the courtesy of ISS, Champaign, Illinois, USA