Figure 4
From: Quantitative blood flow velocity imaging using laser speckle flowmetry
Influence of scatterer size on α.
(a) 1/τc plotted against V for 6 different scatterer sizes (polystyrene microspheres diameter = [0.6–10 μm]), together with a linear fit (dotted lines) to the data points with weights τc. The slope of the linear fit is α. No error bars are plotted for clarity, the average standard error on τc was 4% ± 2% (max. error 12%). (b) α versus scatterer diameter, error bars are 95% CI intervals from linear fit in (a). Also plotted is the theoretically derived α (solid line) using Mie-Percus-Yevick scattering theory and the number of scattering events N in the flow tube (diameter d 0.2 ± 0.03 mm) as obtained from Monte Carlo simulations (N = 1.2μsd), N ranged from [2–15] for [0.6–10 μm] spheres. The shaded area represents the uncertainty in α due to error margins in optical properties of the scatterers.
