Fig. 10.

Registration of the signals arrival time on the two ends of a single scintillator ($t_1^A$, $t_1^B$ and $t_2^A$, $t_2^B$ for the first and second strip, respectively) allows to determine the distance from the scintillators centers ($\mathrm{\Delta }{z}_{1,2}$) and times ($t_{1,2}$) when gamma quanta interacts with scintillators. Then the line of response can be determined as well as the displacement of the annihilation position from its center ($\mathrm{\Delta }\text{LOR}$)