한국방사선학회논문지 (Journal of the Korean Society of Radiology)

  • 제18권6호
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  • Pages.749-756
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  • 2024
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  • 1976-0620(pISSN)
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  • 2384-0633(eISSN)
한국방사선학회 (The Korean Society of Radiology)
권호 표지
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네 면에 SiPM 광센서가 결합된 블록 섬광체를 사용한 고민감도 PET 검출기의 시뮬레이션을 통한 성능 평가

Performance Evaluation through Simulation of a High-Sensitivity PET Detector using Block Scintillator with SiPM Photosensors Attached to Four Sides

  • 안수정 (한국원자력안전기술원 비상대책단 환경방사능평가실) ;
  • 이승재 (동서대학교 방사선학과)
  • Su Jung An (Department of Environmental Radioactivity Assessment, Korea Institute of Nuclear Safety) ;
  • Seung-Jae Lee (Department of Radiological Science, Dongseo University)
  • 투고 : 2024.09.12
  • 심사 : 2024.11.30
  • 발행 : 2024.11.30
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초록

전임상용 양전자방출단층촬영기기(positron emission tomography; PET)의 민감도를 향상시키기 위해 블록형 섬광체를 사용하고, 네 면에 광센서를 배치하여 검출기를 설계하였다. 설계한 검출기의 성능을 평가하기 위해 섬광체 내에서 빛의 이동과 산란, 흡수 등의 모사가 가능한 DETECT2000을 사용하였다. 모든 방향으로 3 mm 간격으로 감마선과 섬광체의 상호작용으로 생성되는 빛을 발생시켜, 광센서를 통해 빛의 신호를 획득하였다. 광센서에서 수집된 빛의 신호는 앵거 식을 통해 XY 평면 및 깊이 방향(Z축)에 대한 영상으로 재구성하였다. XY 평면 영상에서 감마선 이벤트 위치가 모두 분리되어 영상화된 것을 확인할 수 있었으며, 깊이 방향(Z축)에 대해서도 모든 위치에서 영상이 구분되어 나타나는 것을 확인할 수 있었다. 이는 고민감도를 위해 블록형 섬광체를 사용하여 검출기를 설계한 것이 반응 깊이 층까지 측정 가능함을 확인할 수 있는 결과이다. 본 검출기를 사용하여 전임상용 PET을 구성할 경우 민감도와 공간분해능을 모두 향상시킬 수 있을 것으로 판단된다.

To improve the sensitivity of preclinical positron emission tomography (PET), a detector was designed using a block scintillator and photosensors placed on four sides. To evaluate the performance of the designed detector, DETECT2000, which can simulate the movement, scattering, and absorption of light in the scintillator, was used. Light generated by the interaction of gamma rays and the scintillator was generated at 3 mm intervals in all directions, and light signals were obtained through the photosensors. The light signals collected from the photosensors were reconstructed into images for the XY plane and depth direction (Z axis) using the Anger equation. It was confirmed that all gamma-ray event locations were separated and imaged in the XY plane images, and it was confirmed that images were separate at all positions in the depth direction (Z axis). This result confirms that the detector designed using a block scintillator for high sensitivity can measure up to the interaction depth layer. It is expected that both sensitivity and spatial resolution can be improved if preclinical PET is configured using this detector.

키워드

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