Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
권호 표지
DOI QR코드

DOI QR Code

Preliminary Study (1) for Development of Computed Radiography (CR) Image Analysis according to X-ray Non-destructive Test by Wood Species

Computed Radiograhpy (CR)를 통한 목재 수종별 X선 투과 이미지 해석을 위한 기초연구 (1)

  • Song, Jung Il (Cultural Heritage Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Kim, Han Seul (Cultural Heritage Conservation Science Center, National Research Institute of Cultural Heritage)
  • 송정일 (국립문화재연구소 문화재보존과학센터) ;
  • 김한슬 (국립문화재연구소 문화재보존과학센터)
  • Received : 2021.03.30
  • Accepted : 2021.04.26
  • Published : 2021.06.29
Download PDF
⟨ Previous Next ⟩

Abstract

The use of digital copies of film-based analog images and the introduction of digital radiographic imaging systems using image plates gradually replace the non-destructive radiationirradiation method of Cultural Heritage. The quality of images obtained from this technique is affected by conditions such as tube voltage, tube current, and exposure time, type of image acquisition medium, distance of the artifacts from the image acquisition medium, and thickness of artifacts. In this study, we evaluated the grayscale image obtained using GE's Computed Radiograhpy (CR) imaging system, the transmission characteristics of the X-ray source for each tree type (pine, chestnut, sawtooth oak, ginkgo) used in wooden Cultural Heritage, and the signal-to-noise ratio (SNR) and contrast. The GE's CR imaging were analyzed using the Duplex wire image quality indicator, line-pair gauges.

문화재 방사선 비파괴 투과 조사 방식은 이미지플레이트(Image Plate, IP)를 사용하는 디지털 방사선영상시스템(Computed Radiography, CR)이 도입되면서 필름방식의 아날로그 이미지에서 점차 디지털 이미지로 교체되고 있다. 방사선 비파괴 투과 조사의 이미지 품질은 촬영 조건(관전압, 관전류, 노출시간), 영상 획득 매체, 촬영 거리, 유물의 두께 등이 영향을 미친다. 이 논문에서는 목재 문화재에 주로 사용되는 수종(소나무, 밤나무, 은행나무, 상수리나무)에 X선 선원의 투과 특성을 GE사(社)의 CR 영상 시스템을 통해 획득된 이미지의 그레이 스케일(Gray Scale)을 분석한 후 신호 대 잡음비(signal to noise ratio) 및 대조도를 평가하고, 이중-선 상질계(Duplex-wire image quality indicator), 구형파 차트(line-pair gauges), 선형 식별계(Image Quality Indicator)를 이용하여 이미지를 분석하였다.

Keywords

Acknowledgement

본 연구는 국립문화재연구소 문화유산조사연구(R&D) 사업의 일환으로 수행되었으며, 이에 감사한다.

References

  1. Carestream Health, NDT Solutions Rochester, 2007, How to evaluate the radiographic performance and long-term stability of a computed radiography system, 122.
  2. Cultural Heritage Conservation Science Center, 2020, Guidebook for non-destructive penetration investigation of cultural heritage using radiation, 7-12.
  3. Han, K.S., 2008a, Dictionary of Nondestructive Testing, Nodemedia, Duplex Wire Type Image Quality Indicator.
  4. Han, K.S., 2008b, Dictionary of Nondestructive Testing, Nodemedia, Signal to Noise Ratio. (in Korean)
  5. Kang, T.W., 2011, Performance evaluation of indirect digital radiography system, Graduate School Korea University of Bio-medical Sciences.
  6. Kang, S.M., Choi, C.I., Lee, S.K. and Kim, Y.K., 2010, Comparison of non-destructive testing images using 192Ir and 75Se with computed radiography system. Journal of Radiation Protection and Research, 35(1), 26-33. (in Korean with English abstract)
  7. Obuchowski, N.A., 2003, Receiver operating characteristic curves and their use in radiology. Radiology, 229(1), 3-8. https://doi.org/10.1148/radiol.2291010898
  8. Nondestructive Testing Standard Vol. 03.03 ASTM, 2007, Standard Practice foe Classification of Computed radiology System, USA, 1296-1300.
  9. Park, S.K., Ahn, Y.S. and Gil, D.S., 2011, Study on the image quality comparison between in digital RT and film RT, Journal of the Korean Society for Nondestructive Testing, 31(4), 391-397. (in Korean with English abstract)