Fine localization of photons on the pixellated detectors based on the analytical model

In this paper, an analytical model for evaluating the charge induction on pixels of the pixellated CdZnTe (CZT) detector is proposed. According to this model, the cross-talk between pixels increases while the pixel size decreases. We also propose a method for determining the position of charges more accurately by exploiting the charge sharing between the neighboring pixels. Conventionally to increase the resolution of the image, the pixel size is decreased that results in an increase in the amount of cross-talk. With our proposed method, the resolution of the image is effectively increased without the need for decreasing the pixel size.