Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
권호 표지

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

소의 늑골에서 탈회정도와 노출시간에 따른 프랙탈 차원의 변화

  • 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)
  • 정연화 (부산대학교 치과대학 구강악안면방사선학교실) ;
  • 나경수 (부산대학교 치과대학 구강악안면방사선학교실) ;
  • 조봉혜 (부산대학교 치과대학 구강악안면방사선학교실)
  • Published : 2006.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords