Fig. 1. Schematic of diffusion correlation spectroscopy

Fig. 2. Diffuse correlation topography system. (a) Schematic of system; (b) source-detector distribution

Fig. 3. Diagram of multi-tau photon correlator

Fig. 4. Structural diagrams of dynamic phantom. (a) Three-dimensional structure of dynamic phantom connected to peristaltic pump to change flow rate(purple represents solid part, light blue represents liquid background, and dark blue represents target area); (b) transverse section of dynamic phantom (blue represents source, orange represents detector, and red represents imaging area)

Fig. 5. Linearity assessment of system

Fig. 6. Experimental results at four different flow rates. (a) Normalized intensity temporal autocorrelation curves;(b) linear graph of fitted blow flow index

Fig. 7. Topological imaging results of single flow rate channel. (a) Correlation curves at flow rate of 0 mm·s-1; (b) topological image at flow rate of 0 mm·s-1; (c) correlation curves at flow rate of 0.76 mm·s-1; (d) topological image at flow rate of 0.76 mm·s-1; (e) correlation curves at flow rate of 1.52 mm·s-1; (f) topological image at flow rate of 1.52 mm·s-1

Fig. 8. Topological imaging results of two channels with different flow rates. (a) Normalized intensity temporal autocorrelation curves in experiment; (b) topological image