Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Evaluation of Image Quality by Using Various Detector Materials according to Density : Monte Carlo Simulation Study

몬테카를로 시뮬레이션 기반 밀도에 따른 다양한 검출기 물질을 적용한 획득 영상 평가

  • LEE, Na-Num (Department of Radiological Science, Jeonju University) ;
  • Choi, Da-Som (Department of Radiological Science, Jeonju University) ;
  • Lee, Ji-Su (Department of Radiological Science, Jeonju University) ;
  • Park, Chan-Rok (Department of Radiological Science, Jeonju University)
  • 이나눔 (전주대학교 방사선학과) ;
  • 최다솜 (전주대학교 방사선학과) ;
  • 이지수 (전주대학교 방사선학과) ;
  • 박찬록 (전주대학교 방사선학과)
  • Received : 2021.08.10
  • Accepted : 2021.09.08
  • Published : 2021.10.31
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Abstract

The detector performance is important role in acquiring the gamma rays from patients. Among parameters of detector performances, there is density, which relates to respond to gamma rays. Therefore, we confirm the detection efficiency according to various detector materials based on the density parameter using GATE (geant4 application for emission tomography) simulation tool. The NaI (density: 3.67 g/cm3), CZT (Cadimium Zinc Telluride) (density: 5.80 g/cm3), CdTe (Cadmium Telluride) (5.85 g/cm3), and GAGG (Gadoinium Aluminum Gallium Garnet) (density g/cm3) were used as detector materials. In addition, the point source and quadrant bar phantom, which is modeled for 0.5, 1.0, 1.5, and 2.0 mm thicknesses, were modeled to confirm the quatitative analysis using sensitivity (cps/MBq) and the full width at half maximum (FWHM, mm) at the 2.0 mm bar thickness containing visual evaluation. Based on the results, the sensitivity for NaI, CZT, CdTe, and GAGG detector materials were 0.12, 0.15, 0.16, and 0.18 cps/MBq. In addition, the FWHM for quadrant bar phantom in the 2.0 mm bar thickness is 3.72, 3.69, 3.70, and 3.73 mm for NaI, CZT, CdTe, and GAGG materials, respectively. Compared with performance of detector materials according to density, the high density can improve detection efficiency in terms of sensitivity and mean count. Among these detector materials, the GAGG material is efficient for detection of gamma rays.

Keywords

Acknowledgement

This work was supported by the Korea Foundation for the Advancement of Science &Creativity (KOFAC), and funded by the Korean Government(MOE).

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