Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Effect of exposure time and image resolution on fractal dimension

노출 시간과 영상 해상도가 프랙탈 차원값에 미치는 영향

  • An Byung-Mo (Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Heo Min-Suk (Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Lee Seung-Pyo (Dept. of Oral Anatomy and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Lee Sam-Sun (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University) ;
  • Choi Soon-Chul (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University) ;
  • Park Tae-Won (Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Kim Jong-Dae (Division of Information and Communication Engineering, Hallym University)
  • 안병모 (서울대학교 치과대학 구강악안면방사선학교실 및 치학연구소) ;
  • 허민석 (서울대학교 치과대학 구강악안면방사선학교실 및 치학연구소) ;
  • 이승표 (서울대학교 치과대학 구강해부학교실 및 치학연구소) ;
  • 이삼선 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21) ;
  • 최순철 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21) ;
  • 박태원 (서울대학교 치과대학 구강악안면방사선학교실 및 치학연구소) ;
  • 김종대 (한림대학교 정보통신학과)
  • Published : 2002.06.01
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Abstract

Purpose : To evaluate the effect of exposure time and image resolution on fractal dimension calculations for determining the optimal range of these two variances. Materials and Methods : Thirty-one radiographs of the mandibular angle area of sixteen human dry mandibles were taken at different exposure times (0.01, 0.08, 0.16, 0.25, 0.40, 0.64, and 0.80 s). Each radiograph was digitized at 1200 dpi, 8 bit, 256 gray level using a film scanner. We selected an Region of Interest (ROI) that corresponded to the same region as in each radiograph, but the resolution of ROI was degraded to 1000, 800, 600, 500, 400, 300, 200, and 100 dpi. The fractal dimension was calculated by using the tile-counting method for each image, and the calculated values were then compared statistically. Results: As the exposure time and the image resolution increased, the mean value of the fractal dimension decreased, except the case where exposure time was set at 0.01 seconds (α = 0.05). The exposure time and image resolution affected the fractal dimension by interaction (p<0.001). When the exposure time was set to either 0.64 seconds or 0.80 seconds, the resulting fractal dimensions were lower, irrespective of image resolution, than at shorter exposure times (α = 0.05). The optimal range for exposure time and resolution was determined to be 0.08- 0.40 seconds and from 400-1000 dpi, respectively. Conclusion : Adequate exposure time and image resolution is essential for acquiring the fractal dimension using tile-counting method for evaluation of the mandible.

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