Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Comparison of the Modulation Transfer Function of Several Image Plate

Image Plate(IP) 영상의 MTF 비교

  • Kim, Chang-Bok (Dept. of Electrical and Electronic Eng. Dong-shin University) ;
  • Lee, Yang-Sup (Dept. of Radiology, Asan Medical Center) ;
  • Kim, Young-Keun (Dept. of Radiologic Technology, Kwang-ju Health College) ;
  • Lee, Seong-Kil (Dept. of Radiologic Technology, Kwang-ju Health College) ;
  • Lee, Kyung-Sup (Dept. of Electrical and Electronic Eng. Dong-shin University)
  • 김창복 (동신대학교 공과대학 전기전자공학과) ;
  • 이양섭 (서울아산병원 방사선팀) ;
  • 김영근 (광주보건대학 방사선과) ;
  • 이성길 (광주보건대학 방사선과) ;
  • 이경섭 (동신대학교 공과대학 전기전자공학과)
  • Published : 2004.09.30
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Abstract

Among the digital radiography systems, the computed radiography Image Plate Detector System is most frequently being used for the general radiography and also this system commonly diffracts the x-ray images since it is the system that is influenced by the light diffusion from the fluorescent substances. In this study, by using the X-ray Generator, a comparative analysis has been made between 2 different models of computer radiography image plate investigate each model's resolution and sharpness through the modulation transfer function(MTF) measurement. For the analysis, two image plates for general radiography one Fuji ST-VN model(more than 3years old) and one Fuji ST-VL model(less than 2years old) that are currently being used in "Hospital A" were sampled for the MTF measurement here. As the experimental method for this study, the resolution chart method has been carried out by using X-ray generator. Also all the experimental data were printed out by laser printer and measured by microdensitometer. As the results of the experiment carried out in this study, some differences have been found between the two different IP models and Fuji ST-VL has shown its excellence in both of the resolution and the sharpness fields.

방사선부문 디지털시스템 중 일반촬영 부문에서 가장 많이 사용하고 있는 Computed radiography(CR) 영상판(image plate)의 검출시스템은 형광체의 빛 확산 영향을 받는 시스템이므로 영상을 흐리게 만들기 마련이다. 본 연구에서는 X-ray 발생장치를 이용하여 computer radiography 영상판의 정보전달능(modulation transfer function, MTF) 측정을 통해 해상도와 선예도 등을 알아보기 위해 현재 A병원에서 사용중인 일반촬영용 IP 사용년수 3년 이상된 Fuji ST-Vn 모델과 사용년수 2년 미만인 Fuji ST-VI 모델을 대상으로 MTF를 측정하여 분석 비교하였다. 실험방법은 X선 발생장치를 이용하여 resolution chart법으로 시행하였으며, 레이저프린터로 출력하여 microdensitometer로 측정하였다. 실험결과, 2가지의 IP 모델은 차이가 있었으며, 해상도와 선예도 모두 Fuji ST-VI 모델이 우수하게 나타났다.

Keywords