Journal of Korean Academy of Oral and Maxillofacial Radiology (치과방사선)

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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EXPERIMENTAL STUDY ON QUANTITATIVE EVALUATION OF FILM-BASED DIGITAL IMAGING SYSTEM

방사선사진용 디지털 영상시스템의 정량적 평가에 관한 실험적 연구

  • Cho Heang-Hee (Dept. of Oral and Maxillofacial Radiology, College of Dentistry, Dankook University) ;
  • Kim Eun-Kyung (Dept. of Oral and Maxillofacial Radiology, College of Dentistry, Dankook University)
  • 조형희 (단국대학교 치과대학 구강악안면방사선학 교실) ;
  • 김은경 (단국대학교 치과대학 구강악안면방사선학 교실)
  • Published : 1994.06.01
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Abstract

A digital imaging system using Machintosh Ⅱ ci computer, high resolution Sony XC-77 CCD camera, Quickcapture Frame Grabber Board was evaluated for quantitative analysis of standardized periapical film with aluminum step wedge. The results were as follows: 1. Correlation between Al thickness and gray level was high-positively associated(r²=0.99, p<0.001). 2. Correlation between measured weight of experimental lesion and estimated relative lesion volume by digital subtracted radiography was also high-positively associated (r²=0.98, p<0.001). 3. As exposure time was increased, mean gray level was decreased(p<0.01) and slope of regression line between Al thickness and gray level was also decreased (p<0.01). And when the exposure time was shorter than 0.2 second, the value of r² was relatively low. On the basis of the above results, it is considered that this digital imaging system using a Macintosh Ⅱ ci computer & a high resolution CCD monochrome camera will be useful in evaluating digitized image from standardized periapical film quantitatively.

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