Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2014  |  Volume : 39  |  Issue : 1  |  Page : 18-23

ScintSim1 : A new Monte Carlo simulation code for transport of optical photons in 2D arrays of scintillation detectors


1 Physics Unit, Department of Radiotherapy and Oncology; Radiology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
2 Department of Medical Physics and Engineering; Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
3 Physics Unit, Department of Radiotherapy and Oncology, Shiraz University of Medical Sciences, Shiraz, Iran
4 Department of Medical Physics and Engineering, Shiraz University of Medical Sciences, Shiraz, Iran

Correspondence Address:
Mohammad Amin Mosleh-Shirazi
Department of Radiotherapy and Oncology, Namazi Hospital, Shiraz University of Medical Sciences, Shiraz 71936-13311
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.125481

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Two-dimensional (2D) arrays of thick segmented scintillators are of interest as X-ray detectors for both 2D and 3D image-guided radiotherapy (IGRT). Their detection process involves ionizing radiation energy deposition followed by production and transport of optical photons. Only a very limited number of optical Monte Carlo simulation models exist, which has limited the number of modeling studies that have considered both stages of the detection process. We present ScintSim1, an in-house optical Monte Carlo simulation code for 2D arrays of scintillation crystals, developed in the MATLAB programming environment. The code was rewritten and revised based on an existing program for single-element detectors, with the additional capability to model 2D arrays of elements with configurable dimensions, material, etc., The code generates and follows each optical photon history through the detector element (and, in case of cross-talk, the surrounding ones) until it reaches a configurable receptor, or is attenuated. The new model was verified by testing against relevant theoretically known behaviors or quantities and the results of a validated single-element model. For both sets of comparisons, the discrepancies in the calculated quantities were all <1%. The results validate the accuracy of the new code, which is a useful tool in scintillation detector optimization.


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