진단용 엑스선 발생장치에서 부가 여과판에 따른 선량과 화질 비교 = Comparison of Dose and Quality of Copper and Nickel Additional Filter Plate in Diagnostic X-ray Generator

국문 초록 (Abstract)

본 연구는 부가 여과판의 재질로 구리와 니켈을 선정하여 각 물질에 따라 선량과 화질의 차이를 비교 평가하였다. 먼저, 선량에 대한 실험은 흡수선량 측정으로 란도 팬텀을 이용하여 구리 및 니켈의 부가 여과판을 None, 0.1 mm, 0.2 mm, 0.3 mm로 변화시켜 설치하고 120 kVp, 6.3 mAs의 조건으로 조사하였다. 두 번째로, 관전압 변화와 노출지수 변화에 따라 부가 여과판 두께별로 얻은 영상을 Image J 프로그램을 이용하여 SNR과 CNR값을 구하여 영상을 평가 하였다. 흡수선량 측정은 니켈이 구리보다 높게 나왔으며, 두께가 증가할수록 흡수선량은 감소하였다(p<0.05). 관전압이 증가와 노출지수 변화에 대해서도 두 영상에서 유의한 차이를 보이지 않았다(p>0.05). 결론적으로 본 연구는 부가 여과판에서 니켈은 기존의 구리에 비해 피폭선량을 감소하면서도 현재의 영상의 질을 유지할 수 있는 물질임을 알 수 있다.

다국어 초록 (Multilingual Abstract)

The purpose of this study was to evaluate the difference of dose and image quality according to the material of the additional filter plate by selecting copper and nickel. First, the absorbed dose was measured using a Rando phantom setting the additional filter plates of copper and nickel None, 0.1 mm, 0.2 mm, and 0.3 mm under 120 kVp, and 6.3 mAs. Second, We acquired image according to filter thickness of copper and nickel. by changing the tube voltage of 90 kVp, 100 kVp, 110 kVp, 120 kVp and exposure indexes of 400, 800 and 1600. Third, we obtained the SNR and CNR values ​​using the Image J program and evaluated quantitatively and then evaluated image quality. As a result, Absorbed dose measurements showed that nickel was higher than copper, and the absorbed dose decreased as the thickness increased(p<0.05). Furthermore, Quantitative analysis of images showed no significant difference between the two images according to change the voltage and the exposure index(p>0.05). In conclusion, this study confirms that the nickel addition plate can maintain the current image quality while reducing the exposure dose compared to copper.

참고문헌 (Reference)

• 1 황준호, "부가필터를 이용한 kVp 측정의 실효성 평가" 대한방사선과학회 38 (38): 355-363, 2015
• 2 이진수, "변형근치유방절제술 환자의 Ion chamber 변화에 따른 디지털 흉부 영상의 화질 평가" 한국콘텐츠학회 13 (13): 204-210, 2013
• 3 ICRP, "The evolution of system of radiological protection"
• 4 M. Y. Lee, "The effect of x-ray filter materials in the skin dose and tube loading at x-ray examinations" Korea University 2005
• 5 S. H. Kim, "The effect of x-ray filter materials in th e skin dose and tube loading at x-ray examinations" Eulji University 2015
• 6 B. R. Park, "The Comparative Study of Image Quality and Radiation Dose with Changes of Tube Voltage and Current in Digital Chest Radiography" KyungHee University 2007
• 7 R. T. M. Van Soldt, "Survey of poster oanterior chest radiography in The Netherlands: patient dose and image quality" 76 (76): 398-405, 2003
• 8 M. Y. Kim, "Study for Optimal exposure condition of General Chest Projection using Film, CR, DR" International University of Korea 2012
• 9 C. E. Willis, "Strategies for dose reduction in ordinar y radiographic examinations using CR and DR" 34 (34): 196-200, 2004
• 10 A. B. d. González, "Risk of cancer from diagnostic X-rays:estimates for the UK and 14 other countries" 363 (363): 345-351, 2004
• 11 ICRP, "Radiological Protection and Safety in Medicine" Pergamon Press 1996
• 12 A. Madani, "Pulmonary emphysema: radiation dose and section thickness at multidetector CT quantification-com parison with macroscopic and microscopic morphemtry" 243 (243): 250-257, 2007
• 13 A. D. Wrixon, "New ICRP recommendations" 28 (28): 161-168, 2008
• 14 G. J. Yeon, "Flat-panel Digital Radiography of the Chest:comparison patient dose, image quality and DQE using copper Filter" Korea University 2012
• 15 H. L. Arkins, "Effect of absorption edge filters on diagnostic X-ray spectra" 115 (115): 431-437, 1975
• 16 김계선, "Digital Chest Tomosynthesis에서 부가필터에 따른 화질 및 유효선량" 대한방사선과학회 38 (38): 347-353, 2015
• 17 L. J. Krof, "Detection of simulated nodules on clinical radiographs: dose reduction at digital post eroanterior chest radiology" 241 (241): 392-398, 2006
• 18 S. K. Jang, "DAP measurement and patient dose analysis for diagnostic digital radiography system and film-screen system" Korea University 2012
• 19 M. Ganten, "Comparing image quality of flat-panel chest radiography with storage p hosphor radiography and film-screen radiography" 181 (181): 171-176, 2003
• 20 A. Waaijer A, "Circle of Willis at CT angiography: dose reduction and image quality-reducing tube voltage and increasing tube current settings" 242 (242): 832-839, 2007
• 21 J. T. Dobbins, "Chest radiography:optimization of x-ray spectrum for cesium iodide-amorphous silicon flat-panel detector" 226 (226): 221-230, 2003
• 22 W. H. Okka, "Chest radiography with a flat-panel detector: Image quality with dose reduction after copper filtration" 237 (237): 691-700, 2005
• 23 J. Heo, "A study on the effect of rareearth screen filter" 1 (1): 17-23, 1988