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\label{fig:doi-ctr} $\gamma\gamma$ The two timing  coincidence apparatus for determining apparatuses. In (a)  the contribution of depth of interaction (DOI) upon standard coincidence apparatus, used in this paper to measure  the timing performance with the scintillator crystal length, $L$ is shown. In (b) the depth  of interaction (DOI) coincidence apparatus is seen. In this,  the measured  scintillator detector under investigation. This schematic has been drawn is rotated 90 degrees, with respect  to scale the reference scintillator detector. In the standard coincidence apparatus the Na22 source is placed equidistant between the two scintillator detectors, whereas in the DOI coincidence apparatus the source is placed much closer  toillustrate  the measured scintillator detector. This leads to electronic collimation forming a  confinement region, region within the measured scintillator detector. The confinement region is  shown in the grey surrounded by a  red dashed line box precisely. line\cite{Moses_Ullisch_2006}\cite{Moses_Ullisch_2006}.