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KMID : 1151820220160020151
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Journal of the Korean Society of Radiology
2022 Volume.16 No. 2 p.151 ~ p.156
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Digital Position Measurement with MLPE of PET detector using a Small Number of Photosensors
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Kang Seung-Hun
Lee Seung-Jae
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Abstract
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A detector using a small number of photosensors was designed, and the position of a scintillation pixel that interacted with gamma rays through a maximum likelihood position estimation(MLPE) was measured as a digital position. For this purpose, simulation was performed using DETECT2000, which can simulate the movement of light within the scintillator, and the accuracy of position measurement was evaluated. A detector was configured using a 6 6 scintillation pixel array and 4 photosensors, and a gamma ray event was generated at the center of each scintillation pixel to create a look-up table through the ratio of acquired light. The gamma-ray event generated at the new position was applied as the input value of the MLPE, and the positiion of the scintillation pixel was converted into a digital positiion after comparison with the look-up table. All scintillation pixels were evaluated, and as a result, a high accuracy of 99.1% was obtained. When this method is applied to the currently usesd system, it is concidered that the process of determining the position of the scintillation pixel will be simplified.
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KEYWORD
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Digital position, MLPE, photosensor, DETECT2000
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