Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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The Study on the Attenuation of X-ray and Imaging Quality by Contents in Stomach

위장내 음식물에 따른 방사선 감약 및 화질에 관한 연구

  • Dong, Kyung-Rae (Department of Radiological Technology, Gwangju Health College University) ;
  • Ji, Youn-Sang (Department of Radiological Technology, Gwangju Health College University) ;
  • Kim, Chang-Bok (Department of Radiological Technology, Gwangju Health College University) ;
  • Choi, Seong-Kwan (Department of Radiological Technology, Gwangju Health College University) ;
  • Moon, Sang-In (Department of Radiological Technology, Gwangju Health College University) ;
  • Dieter, Kevin (Department of Physical Therapy, Gwangju Health College University)
  • Published : 2009.03.31
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Abstract

This study examined the change in the attenuation of X-rays with the ROI (Region of Interest) in DR (Digital Radiography) according to the stomach contents by manufacturing a tissue equivalent material phantom to simulate real stomach tissue based on the assumption that there is some attenuation of X-rays and a difference in imaging quality according to the stomach contents. The transit dosage by the attenuation of X-rays decreased with increasing protein thickness, which altered the average ROI values in the film and DR images. A comparison of the change in average ROI values of the film and DR image showed that the image in film caused larger density changes with varying thickness of protein than the image by DR. The results indicate that NPO (nothing by mouth) is more important in film system than in DR system.

인체의 $40{\sim}50%$인 연부조직에 X선을 조사하면 연부조직의 두께에 따라 투과선량이 감소하며 영상에도 질적 저하를 가져온다. 본 연구는 복부 촬영시 위장내 내용물에 따라 X선 감약 및 화질에 차이가 나타날 수 있다는 가정 하에 실제 위의 조직과 비슷한 조직등가물질 phantom을 제작하여 실제 위장내 내용물에 따른 X선의 감약 변화와 DR (Digital Ridiography)의 ROI수치를 비교해보았다. 단백질 두께가 증가할수록 X-선 감약에 의한 투과선량이 감소되었으며(p < 0.001), Film과 DR 영상에서의 ROI Mean값의 변화도 감소하였다(p <0.001). Film과 DR 영상에서의 ROI Mean값에 대한 비교는 Film이 DR 영상에 비해 단백질 두께에 따른 농도의 변화 값이 크게 나타났다(p < 0.001). 이와 같은 결과를 종합해 볼 때 DR system 촬영 보다는 필름을 사용하는 단순촬영에서 금식(NPO ; nothing by mouth)의 필요성이 더 중요함을 알 수 있다.

Keywords

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