Fig. 7.

The time-gated ACF decay was estimated for different time gates (a-c). Time zero is set to IRF maximum for the bottom time-axis while the red axis located on top of the sub-figures present TOF with respect to a point located at 10% of the DTOF maximum on its rising edge ($t_{lower}$). The corresponding $\alpha D_B$ for each medium was calculated based on time zero located at IRF max (d-f), and time zero at IRF edge (g-i).