Fig. 6.

Speckle contrast measurements from phantom experiments in which ${\mu }_s^{\prime }$ was varied, i.e. (a) ${\mu }_s^{\prime }$ = 4cm⁻¹, (b) ${\mu }_s^{\prime }$ = 7cm⁻¹, (c) ${\mu }_s^{\prime }$ = 10cm⁻¹, (d) ${\mu }_s^{\prime }$ = 13cm⁻¹, and (e) ${\mu }_s^{\prime }$ = 16cm⁻¹, and other parameters were constant. The solid lines are the fitting results calculated by Eq. (4). Some speckle contrast measurements in (d) and (e) are not available due to the low CCD SNR.