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Proceedings Paper

IDEFIX: identification of dental fixtures in intraoral x rays
Author(s): Thomas Martin Lehmann; Walter Schmitt; Harald Horn; Walter Hillen
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Paper Abstract

In dental implantology more than one hundred enossal implant systems are in use. Once embedded, the dental x-ray examination is the most important tool for determining implants' producer, name, and type. In this paper, we present a system for automatic detection and identification of dental fixtures in intraoral x rays (IDEFIX) combining common direct digital image acquisition techniques with specially designed image analysis. IDEFIX can process any digital radiograph (e.g. RVG, Sens-A-Ray, Schick, Sidexis, Digora) as well as digitized dental films. A reference database has been generated by precise measurement on the implant systems used so far (eight implants) including parameters like length, diameter, and cross section area. After binarization of the current digital x-ray image, a parameter set is extracted from each detected object applying mathematical morphology. All objects are classified using a simplified nearest neighbor method and the Euclidean distance metric. If the distance of the objects' parameter set to one of the reference sets is below a given threshold, name and type of the identified dental fixture are displayed on the screen. Otherwise, the actual object will be rejected as a no-implant. IDEFIX has been evaluated by processing various in-vitro acquired radiographs. Different implants were classified captured with identical conditions as well as acquired varying the angulation of the x-ray tube. It is shown that misangulations up to twenty degrees are tolerable preserving correct identification. Other image structures like teeth or fillings result in large distances to all reference parameter sets and, therefore, they are reliably recognized as non-implants.

Paper Details

Date Published: 16 April 1996
PDF: 12 pages
Proc. SPIE 2710, Medical Imaging 1996: Image Processing, (16 April 1996); doi: 10.1117/12.237961
Show Author Affiliations
Thomas Martin Lehmann, Technical Univ. Aachen (Germany)
Walter Schmitt, Technical Univ. Aachen (Germany)
Harald Horn, Technical Univ. Aachen (Germany)
Walter Hillen, Technical College Aachen (Germany)

Published in SPIE Proceedings Vol. 2710:
Medical Imaging 1996: Image Processing
Murray H. Loew; Kenneth M. Hanson, Editor(s)

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