산업용 SPECT의 검출기 개수가 영상 해상도에 미치는 영향 평가
Effect of the Number of Detectors on Performance of Industrial SPECT
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
To predict the details of flow in industrial process unit, single photon emission computedtomography (SPECT) is a promising technique. Recently, industrial SPECT based on medicalsystem has developed by researchers of the Korea Atomic Energy Research Institute (KAERI) andHanyang University. In the present study, to confirm the effect of the number of detectors on imagequality, and determine the optimal number of detectors in industrial SPECT, industrial SPECTsystem with various geometries were evaluated by the Monte Carlo simulation. CsI(Tl) detectors (12mm×12mm×20 mm) with collimators (the geometric resolution of collimator Rg was 4 cm at thecenter of the 30 cm diameter cylindrical vessel object) were modeled in a hexagonal array, and thepoint sources of 99mTc, 68Ga, and 137Cs were simulated at the center of the cylindrical vessel objectusing the MCNPX code. Then, the reconstruction images of each geometry were reconstructedusing the expectation maximization (EM) algorithm. In this study, the reciprocity theorem wasused to improve computation time required for system matrix of the EM algorithm. The resultshows that the resolution of the reconstructed image was significantly improved by increasing thenumber of detectors in industrial SPECT system and more than 60 detectors will be required forthe resolution of the reconstructed image.
Abstract
To predict the details of flow in industrial process unit, single photon emission computedtomography (SPECT) is a promising technique. Recently, industrial SPECT based on medicalsystem has developed by researchers of the Korea Atomic Energy Research Institute (KAERI) andHanyang University. In the present study, to confirm the effect of the number of detectors on imagequality, and determine the optimal number of detectors in industrial SPECT, industrial SPECTsystem with various geometries were evaluated by the Monte Carlo simulation. CsI(Tl) detectors (12mm×12mm×20 mm) with collimators (the geometric resolution of collimator Rg was 4 cm at thecenter of the 30 cm diameter cylindrical vessel object) were modeled in a hexagonal array, and thepoint sources of 99mTc, 68Ga, and 137Cs were simulated at the center of the cylindrical vessel objectusing the MCNPX code. Then, the reconstruction images of each geometry were reconstructedusing the expectation maximization (EM) algorithm. In this study, the reciprocity theorem wasused to improve computation time required for system matrix of the EM algorithm. The resultshows that the resolution of the reconstructed image was significantly improved by increasing thenumber of detectors in industrial SPECT system and more than 60 detectors will be required forthe resolution of the reconstructed image.
참고문헌 (12)
- 박장근, "상반 정리 적용을 통한 산업용 SPECT 영상 재구성용시스템 행렬 계산속도 향상 연구", 대한방사선방어학회2010 추계학술발표회 논문요약집, pp.124~125 (2010)
- Attix FH, "Introduction to Radiological Physics and Radiation Dosimetry", pp.55~59 (1986), Wiley
- Celler A, "Multiple line source array for SPECT transmission scan : simulation, phantom and patient studies", J. Nucl. Med, 39, pp.2183~2189 (1998)
- Fashey FH, "Sensitivity, resolution and image quality with a multi-head SPECT camera", J. Nucl. Med, 33, pp.1859~ (1992)
- Hendricks J., "MCNPX User’s Manual Version 2.5.e", LANL, ~ (2004)
- Kimura K, "A new apparatus for brain imaging : four-head rotating gamma camera single-photon emission computed tomography", J. Nucl. Med, 31, pp.603~609 (1990)
- Legoupil S, "Determination of the detection process in an experimental tomograph for industrial flow visualization using radioactive tracers", IEEE Transactions on Nuclear Science, 43(2), pp.751~760 (1996)
- Legoupil S, "An experimental single photon emission computed tomograph method for dynamic 2D fluid flow analysis", Applied Radiation and Isotopes, 48, pp.1507~1514 (1997)
- Moon TK, "The expectation-maximization algorithm", IEEE Signal Processing Magazine, 13, pp.47~60 (1996)
- Park JG, "Experimental test of double-layer method for industrial SPECT", Nuclear Technology, 175, pp.113~117 (2010)
- Park JG, "Development of an Industrial SPECT to Study Dynamic Behavior of Plant Process Flow", Trans. Korean Nucl. Soc. Autumn Meeting. Transactions of the Korean Nuclear Society (2008) (2008)
- Wernick MN, "Emission Tomography:The Fundamentals of PET and SPECT", pp.153~168 (2004), Elsevier Acadmic Press