The Influence of the Change of Patient Radiation Exposure Dose Distribution on the Grid Condition and Detector Acquisition Dose on the Exposure Distance in the Use of Amorphous Silicon Thin Film Transistor Detector with AEC
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(2) 대한디지털의료영상학회논문지 9(2)：12, 2007 Journal of the Korean Society for Digital Imaging in Medicine. Ⅰ. 서 론. Ⅱ. 연구대상 및 방법 1. 연구대상 1) 디지털 검출기(Digital Detector). - 24 -.
(3) 자동노출제어장치를 이용한 비정질 실리콘 평판형 검출기에서 격자의 조건에 따른 환자선량 변화와 촬영 거리의 변화가 검출기 획득선량에 미치는 영향. Table 1. Specification of Canon CXDI 40G X-Ray Conversion. Receptor Type. Gadolinium Oxysulfide Amorphous Silicon. Panel Active Size. Pixel Pitch. 43×43cm. 160Micron. Fig. 1. Set the area where the phototimer is installed. Active Pixel Matrix Data Acquisition 2,688× 2,688. 14bit. Fig. 2. Anthropomorphic Phantom. Table 2. Type of grid by company Company. Canon. Philips. Siemens. GE. Type. Fixed Grid. Oscillating Grid. Fixed Grid. Fixed Grid. 2) X-선 발생장치(X-ray Generator). 3) 자동노출제어장치(AEC). 2. 연구방법. 4) 복부팬텀(Phantom). 5) 선량측정기(Measurement). 6) 격자(Grid). - 25 -.
(4) 대한디지털의료영상학회논문지 9(2)：12, 2007 Journal of the Korean Society for Digital Imaging in Medicine. Ⅲ. 결 과. Table 3. Patient Dose by grid ratio and focus-grid distance decentering Grid ratio. 초점거리(cm). 촬영거리(cm). mAs. REX. mGy. 10 : 1. 110. 110. 16.75. 121.67. 0.76. 12 : 1. 180. 110. 21.76. 129. 0.95. 선량 증가율 %. - 26 -. 20.
(5) 자동노출제어장치를 이용한 비정질 실리콘 평판형 검출기에서 격자의 조건에 따른 환자선량 변화와 촬영 거리의 변화가 검출기 획득선량에 미치는 영향. A. B. Fig. 3. A is grid ratio 10 : 1, focusing distance 110cm, exposure distance촬영거리 110cm(standard method), B is grid ratio 12 : 1, focusing distance 180cm, exposure distance 110cm(Incorrect method). A. C. B. D. Fig. 4. Measurement of mAs(A), REX(B), mGy(C) by increase of distance(AEC ON) and mGy(D) by increase of distance at fixed mAs(AEC OFF). - 27 -.
(6) 대한디지털의료영상학회논문지 9(2)：12, 2007 Journal of the Korean Society for Digital Imaging in Medicine. Fig. 5. Correlation analysis between REX and mGy(R2 coefficient of correlation = 0.9596. Fig. 6. Standard of method use of Grid. Ⅳ. 고 찰. - 28 -.
(7) 자동노출제어장치를 이용한 비정질 실리콘 평판형 검출기에서 격자의 조건에 따른 환자선량 변화와 촬영 거리의 변화가 검출기 획득선량에 미치는 영향. Fig. 7. Effective Focal distance of grid ratio 12 : 1, focal distance 140cm. Ⅴ. 결 론. - 29 -.
(8) 대한디지털의료영상학회논문지 9(2)：12, 2007 Journal of the Korean Society for Digital Imaging in Medicine. 참고문헌. - 30 -.
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