Fig. 2.

Phantom experiments to calibrate/validate the contact DSCF probe against a noncontact CCD-based diffuse speckle contrast probe and a standard contact DCS probe. (a) Experimental setup (right) and the configuration (left) of contact DSCF and DCS probes. Note that all three probes (i.e., contact DSCF probe, contact DCS probe, and noncontact CCD-based probe) shared one long-coherence laser source (DL785-100). Bland–Altman plots with the limits of agreement (dashed lines) for the comparisons between relative flow changes measured by the (b) contact DSCF probe and noncontact CCD-based probe, (c) contact DSCF probe and standard contact DCS probe, and (d) noncontact CCD-based probe and standard contact DCS probe.