Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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The Study on Scattered Radiation Effects According to Acquisition of X-ray Imaging using Monte Carlo Simulation

몬테카를로 시뮬레이션을 이용한 X선 의료영상 획득 시 산란선 발생 영향 연구

  • Park, Ji-Koon (Institute of Radiation Fusion Technology, International University of Korea) ;
  • Kang, Sang-Sik (Institute of Radiation Fusion Technology, International University of Korea) ;
  • Yang, Seung-Woo (Department of Radiological Science, International University of Korea) ;
  • Heo, Ye-Ji (Department of Medical Imaging Research Institute, Inje University) ;
  • Kim, Kyo-Tae (Software Education Institute, Inje University)
  • 박지군 (한국국제대학교 방사선융합기술연구소) ;
  • 강상식 (한국국제대학교 방사선융합기술연구소) ;
  • 양승우 (한국국제대학교 방사선학과) ;
  • 허예지 (인제대학교 의료영상연구소) ;
  • 김교태 (인제대학교 소프트웨어교육원)
  • Received : 2018.09.28
  • Accepted : 2018.10.31
  • Published : 2018.10.31
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Abstract

The medical imaging technique images the contrast formed based on the difference in absorption coefficient of X-rays which changes according to the composition and thickness of the object. At this time, not only primary rays entering the image detector but also scattered rays greatly affect the image quality. Therefore, in this paper, Forward scattering rate and Scattered to primary ratio analysis were performed through Monte Carlo simulation in order to consider influence of scattered ray generated according to object thickness and radiation exposure area change on image quality. In the study, the Forward scattering rate corresponding to the thickness of the object was analyzed at a maximum of 15.3%p and the Scattered to primary ratio was analyzed at 2.00 to 4.54, but it was analyzed as maintaining a constant value for radiation exposure area change. Based on these results, the thickness of the object should be considered as a factor influencing the quality of the image, but radiation exposure area verified that it is a factor that does not affect the image quality. We believe that the results of this research can be utilized as basic information of scattered radiation to improve image quality.

방사선 영상 기술은 피사체의 조성 및 두께에 따라 변화되는 X선의 흡수계수 차이를 기반으로 형성되는 대조도를 영상화하는 기술로서 영상 검출기에 입사하는 1차선 뿐 만 아니라 산란선이 영상 품질에 큰 영향을 미친다. 이에 본 연구에서는 피사체 두께, 조사야 변화에 따라 발생하는 산란선이 영상 품질에 미치는 영향을 고찰하고자 몬테카를로 시뮬레이션을 통하여 FSR 및 SPR 분석을 수행하였다. 연구 결과, 피사체 두께에 따른 FSR은 최대 15.3%p, SPR은 2.00 ~ 4.54로 분석되었으나, 조사야 변화에 대해서는 일정한 값을 유지하는 것으로 분석되었다. 이러한 결과를 바탕으로 피사체 두께는 영상 품질에 영향을 미치는 인자로서 고려되어야 하지만, 조사야는 영상 품질에 영향을 미치지 못하는 인자임을 검증하였다. 이러한 본 연구 결과는 영상 품질 개선을 위한 산란선에 대한 기초 자료로서 활용할 수 있을 것으로 사료된다.

Keywords

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