치과방사선 (Journal of Korean Academy of Oral and Maxillofacial Radiology)
- 제24권1호
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- Pages.137-147
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- 1994
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- 1225-049X(pISSN)
방사선사진용 디지털 영상시스템의 정량적 평가에 관한 실험적 연구
EXPERIMENTAL STUDY ON QUANTITATIVE EVALUATION OF FILM-BASED DIGITAL IMAGING SYSTEM
- Cho Heang-Hee (Dept. of Oral and Maxillofacial Radiology, College of Dentistry, Dankook University) ;
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Kim Eun-Kyung
(Dept. of Oral and Maxillofacial Radiology, College of Dentistry, Dankook University)
- 발행 : 1994.06.01
초록
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.
키워드