Journal of Radiation Protection and Research
- 제24권3호
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- Pages.161-170
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- 1999
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- 2508-1888(pISSN)
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- 2466-2461(eISSN)
비정질 실리콘 디지털 방사선 촬영기와 X-ray film과의 영상질 비교 평가
Comparison of Image Quality of the Amorphous Silicon DR System and the Film-screen Systems
- Youn, Je-Woong (Catholic University) ;
- Lee, Hyoung-Koo (Catholic University) ;
-
Suh, Tae-Suk
(Catholic University) ;
-
Choe, Bo-Young
(Catholic University) ;
- Shin, Kyung-Sub (Catholic University) ;
- Mun, In-K. (Columbia University) ;
- Kim, Hong-Kwon (Catholic University) ;
- Han, Yong-Woo (JM Technologies) ;
- Nam, Seung-Bae (JM Technologies)
- 발행 : 1999.09.30
초록
비정질 실리콘 방사선 촬영기와 기존 X-ray filmrh과의 영상질 비교를 통하여 시스템의 성능을 평가하였다. 다양한 영상질 평가를 위하여 MTF (Modulation Transfer Function), NPS (Noise Power Spectrum), Contrast를 측정하여 계산하였다. 실험 결과 DR의 MTF는 기존 film-screen system과 유사하였다. Noise 특성은 두 시스템 모두 quantum noise가 주를 이뤘으며, 특히 DR 에서는 전기적인 noise가 발견되었다. 또한 우수한 sensitivity 특성과 영상처리를 통하여 DR 시스템이 기존의 film-screen 시스템보다 놀은 대조도를 보였다. 이와 같이 DR에서는 기존 film-screen 시스템과 유사한 해상도와 영상처리를 통해 같은 촬영조건에서도 향상된 대조도의 영상을 얻을 수 있었다. 본 연구를 통하여 의학적 활용과 관련된DR 시스템의성능에 대한 유용한 정보를 제공할 수 있으리라 기대한다.
System performances in terms of image quality between an amorphous silicon DR system and a conventional film-screen system were evaluated. Various aspects of image quality MTF (modulation transfer function), NPS (noise power spectrum), SNR(signal-to-noise ratio) and contrast were measured and calculated. The MTF of the DR system was comparable to the film-screen systems. The noise was mainly dominated by the quantum mottle in both systems and the electronic noise was found in the DR system. The contrast of the DR system was better than the film-screen systems by virtue of high sensitivity and image processing. Compared to the film-screen systems in general radiography, the DR system had similar resolution and showed better contrast with the same exposure condition after contrast manipulation. The results of this study provide some useful information about the performance of the DR system in connection with medical applications.
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