Three-dimensional image reconstruction for JPET-D4 using suitable histogramming method to DOI detector

The next generation PET scanner named JPET-D4 has been developed at the National Institute of Radiological Sciences (NIRS) in Japan. The JPET-D4 has 4 layers DOI detectors and its data size becomes huge to handling. Then at first stage, we plan to apply the reconstruction techniques after the histogramming of list-mode data because it is easy to implement and effective to decrease computational cost The conventional histogramming technique is inapplicable to 4 layers DOI detectors, so we proposed the new histogramming method which is suitable for the multi-layer DOI detector. In this method, DOI-PET list-mode data is transformed into sinogram with an accurate system model of the crystal block. In this paper, we implemented this method with a full three dimensional system model. And we also applied the method to experimental data with prototype system for the JPET-D4 scanner. Experimental results show that the proposed method keeping the advantage of DOI information, and the image quality of the JPET-D4 is superior to a conventional NonDOI PET scanner.