Journal of Korean Academy of Oral and Maxillofacial Radiology (치과방사선)

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Evaluation of Teeth and Supporting Structures on Digital Radiograms using Interpolation Methods

보간법을 이용한 디지털 방사선영상에서 치아 및 지지구조물의 ROC평가

  • Koh Kwang-Joon (Dept. of Oral and Maxillofacial Radiology, School of Dentistry, and Institute of Oral Bio Science, Chonbuk National University) ;
  • Chang Kee-Wan (Dept. of Preventive and Community Dentistry School of Dentistry, and Institute of Oral Bio Science, Chonbuk National University)
  • 고광준 (전북대학교 치과대학 구강악안면방사선학교실 및 구강생체과학연구소) ;
  • 장기완 (전북대학교 치과대학 예방치과학교실 및 구강생체과학연구소)
  • Published : 1999.02.01
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Abstract

Objectives: To determine the effect of interpolation functions when processing the digital periapical images. Material and Methods: The digital images were obtained by Digora and CDR system on the dry skull and human subject. 3 oral radiologists evaluated the 3 portions of each processed image using 7 interpolation methods, and ROC curves were obtained by trapezoidal methods. Results: The heighest Az value(0.96) was obtained with cubic spline method and the lowest Az value(0.03) was obtained with facet model method in Digora system. The heighest Az value (0.79) was obtained with gray segment expansion method and the lowest Az value(0.07) was obtained with facet model method in CDR system. There was significant difference of Az value in original image between Digora and CDR system at a=0.05 level. There were significant differences of Az values between Digora and CDR images with cubic spline method, facet model method, linear interpolation method and non-linear interpolation method at α=0.1 level.

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