- - - PhD Candidate, Faculty of Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia
- - - PhD, Faculty of Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia
- - - PhD, Faculty of Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia
- - - PhD, Faculty of Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia
- - - PhD, Faculty of Science, University Teknologi Malaysia, Skudai, Johor, Malaysia
- - - PhD, Department of Biomedical Engineering, Chengde Medical University, Chengde, Hebei, China

Background: Recent research on photon detection has led to the introduction of a silicone photomultiplier (SiPM) that operates at a low voltage and is insensitive to magnetic fields. Objective: This work aims to model a scintillation camera with a SiPM sensor and to evaluate the camera reconstructed images from gamma ray projection data.Material and Methods: The type of study in this research is experimental work and analytical. The scintillation camera, modelled from an SiPM sensor array SL۴-۳۰۰۳۵, coupled with a scintillation material Caesium Iodide doped with Thallium (CsI(Tl)), is used in the experimental part. The performance of the camera was evaluated from reconstructed images by a back-projection technique of a radioactive source Caesium-۱۳۷ (Cs-۱۳۷). Results: The experiments conducted with a ۱ µCi Cs-۱۳۷ radioactive source have revealed that the bias voltage (Vbias) of the SiPM needs to be set to ۲۷.۸ V at an operating temperature between ۴۳ °C to ۴۴ °C. The radioactive source has to be placed within a ۱ cm distance from the sensor to obtain the optimum projection data. Finally, the back-projection technique for image reconstruction with linear interpolation pre-processing has revealed that the Ram-Lak filter produces a better image contrast ratio compared to others. Conclusion: This research has successfully modelled a scintillation camera with SiPM that was able to reconstruct images with an ۸۶.۴% contrast ratio from gamma ray projection data.

Gamma Cameras, Silicone Photomultiplier (SiPM), Photomultiplier Tubes (PMT), Image reconstruction, Filter Back-Projection, Radionuclide Imaging, Scintillation Counting