Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Comparison of Dose and Quality of Copper and Nickel Additional Filter Plate in Diagnostic X-ray Generator

진단용 엑스선 발생장치에서 부가 여과판에 따른 선량과 화질 비교

  • Received : 2017.10.10
  • Accepted : 2017.11.30
  • Published : 2017.11.30
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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.

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.

Keywords

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