Fig. 3.

(a) Exemplar DCS $g_2(\tau )$ measurements obtained at two distinct probe pressures on the right forearm of a healthy adult at a source-detector separation of 2.1 cm and a sampling rate of 20 Hz (solid lines are data and dotted lines are semi-infinite fits). The mean photon count rates for the 38- and 196-mmHg probe pressures were 220 and 623 kcps, respectively. (b) Exemplar temporal measurements of DCS BFI at each probe pressure and (c) Fourier spectral amplitudes of the 1-min data intervals acquired at each probe pressure plotted against frequency.