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몬테카를로 시뮬레이션 기반 밀도에 따른 다양한 검출기 물질을 적용한 획득 영상 평가
이나눔(Na-Num LEE),최다솜(Da-Som Choi),이지수(Ji-Su Lee),박찬록(Chan-Rok Park) 대한방사선과학회(구 대한방사선기술학회) 2021 방사선기술과학 Vol.44 No.5
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.
Pre-Decision Path 및 Sample/Hold-Decision Feedback Equalizer를 이용한 Far-End Crosstalk 보상기
성나눔(Na-Num Sung),권경하(Kyeong-Ha Kwon) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
The demand for a faster memory interface is increasing due to limited bandwidth between memory and processor. Densely constructed channels can help achieve this, but they cause crosstalk interference and increase bit error rate. This paper proposes a crosstalk compensation architecture based on sample/hold-decision feedback equalizer with pre-decision paths.