Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Influence of threshold value of computed tomography on the accuracy of 3-dimensional medical model

전산화단층 촬영상의 임계치가 3차원 의학모델 정확도에 미치는 영향에 대한 연구

  • Lee Byeong-Do (Dept of Oral & Maxillofacial Radiology, School of Dentistry, Wonkwang University Wonkwang Dental Research Institute) ;
  • Lee Wan (Dept of Oral & Maxillofacial Radiology, School of Dentistry, Wonkwang University Wonkwang Dental Research Institute)
  • 이병도 (원광대학교 치과대학 구강악안면방사선학교실, 원광 치의학연구소) ;
  • 이완 (원광대학교 치과대학 구강악안면방사선학교실, 원광 치의학연구소)
  • Published : 2002.03.01
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Abstract

Purpose: To evaluate the influence of threshold value of computed tomography on the accuracy of rapid prototyping (RP) medical model Material and Methods : CT datas of a human dry skull were transferred from CT scanner via compact disk to a personal computer (PC). 3-dimensional image reconstruction on PC by V-works/sup TM/ 3.0 (CyberMed. Inc.) software and RP models fabrication were followed. 2-RP models were produced by threshold value of 500 and 800 selected in surface rendering process. Linear measurements between arbitrary 12 anatomical landmarks on dry skull, 3-D image model, and 2-RP models were done and compared. Thus, the accuracy of 500 RP and 800RP models was respectively evaluated. Results: There was mean difference (% difference) in absolute value of 2.27 mm (2.73%) between linear measurements of dry skull and 500 RP model. There was mean difference (% difference) in absolute value of 1.94 mm (2.52%) between linear measurements of dry skull and 800 RP model. Conclusion: Slight difference of threshold value in rendering process of 3-D modelling made a influence on the accuracy of RP medical model.

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