J Korean Acad Oral Maxillofac Radiol.  1999 Feb;29(1):65-85.

Evaluation of Teeth and Supporting Structures on Digital Radiograms using Interpolation Methods

• Koh KJ
• Chang KW

Abstract

OBJECTIVES
To determine the effect of interpolation functions when processing the digital periapical images.
MATERIALS 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 alpha=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 alpha= 0.1 level.

Keyword

interpolation methods; digital periapical radiogram; ROC analysis

MeSH Terms

Humans
Radiography, Dental, Digital
ROC Curve
Skull
Tooth*