Fig. 2.

(A) Speckle intensity autocorrelation curve, g₂(t), measured at 0, 6, 10, and 12 minutes during coagulation process from a human blood sample. It was observed that g₂(t) decay slowed down as blood coagulation progressed. No significant change in the g₂(t) decay trend was observed after completion of clot formation. Slower g₂(t) decay and the corresponding increase in speckle autocorrelation time constant (τ) indicated an increase in clot viscoelastic modulus during coagulation process. (B) Speckle autocorrelation time constant, τ (primary y-axis), and the viscoelastic modulus |G*(ω)|_{ω = 1} Hz (secondary y-axis) plotted as a function of coagulation time for a human blood sample. Similar trends were observed for both the τ, and |G*| curves during coagulation. In each case, the average value of the three LSR τ-measurements is plotted and the error bars depict standard deviations.