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

• Published in: 방사선기술과학 Vol. 44; no. 5; pp. 459 - 464
• Main Authors: 이나눔(Na-Num LEE), 최다솜(Da-Som Choi), 이지수(Ji-Su Lee), 박찬록(Chan-Rok Park)
• Format: Journal Article
• Language: Korean
• Published: 대한방사선과학회(구 대한방사선기술학회) 30.10.2021; KOREAN SOCIETY OF RADIOLOGICAL TECHNOLOGY; 대한방사선과학회
• Subjects: 방사선과학; 밀도. 핵의학; Sensitivity; Quadrant bar phantom; 점선원; 민감도; 사분할 바 팬텀; Nuclear Medicine; Density; Pointsource
• ISSN: 2288-3509; 2384-1168

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.