소의 늑골에서 탈회정도와 노출시간에 따른 프랙탈 차원의 변화

Change of the fractal dimension according to the decalcification degree and the exposure time in the bovine rib

  • 정연화 (부산대학교 치과대학 구강악안면방사선학교실) ;
  • 나경수 (부산대학교 치과대학 구강악안면방사선학교실) ;
  • 조봉혜 (부산대학교 치과대학 구강악안면방사선학교실)
  • Jung Yun-Hoa (Department of Oral and Maxillofacial Radiology, College of Dentistry, Pusun National University) ;
  • Nah Kyung-Soo (Department of Oral and Maxillofacial Radiology, College of Dentistry, Pusun National University) ;
  • Cho Bong-Hae (Department of Oral and Maxillofacial Radiology, College of Dentistry, Pusun National University)
  • 발행 : 2006.06.01

초록

Purpose : We evaluated the fractal dimension changes on bovine rib radiographs according to the decalcification degree and the exposure time in the bovine rib. Materials and Methods : Twenty 5 mm thick cross-sectional blocks from bovine rib bone were progressively decalcified in 30 mL 0.1 N hydrochloric acid for 5, 30, and 90 minutes. They were radiographed at three exposure time settings (0.22, 0.36, 0.43 mAs) before and after each decalcification stage. We selected $100{\times}100$ pixel-sized regions of interests (ROIs) on trabecular bone and calculated fractal dimensions by box-counting method. Results : Repeated measures ANOVA showed that fractal dimensions gradually decreased after acid-induced demineralization and with more exposure (P<0.001). Conclusion : The fact that fractal dimensions decrease after decalcification might support the hypothesis that patients with osteoporosis have decreased radiographic fractal dimension in trabecular bone in comparison to normal subjects.

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