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Journal of Medical Imaging

Automatic segmentation of mandible in panoramic x-ray
Author(s): Amir Hossein Abdi; Shohreh Kasaei; Mojdeh Mehdizadeh
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Paper Abstract

As the panoramic x-ray is the most common extraoral radiography in dentistry, segmentation of its anatomical structures facilitates diagnosis and registration of dental records. This study presents a fast and accurate method for automatic segmentation of mandible in panoramic x-rays. In the proposed four-step algorithm, a superior border is extracted through horizontal integral projections. A modified Canny edge detector accompanied by morphological operators extracts the inferior border of the mandible body. The exterior borders of ramuses are extracted through a contour tracing method based on the average model of mandible. The best-matched template is fetched from the atlas of mandibles to complete the contour of left and right processes. The algorithm was tested on a set of 95 panoramic x-rays. Evaluating the results against manual segmentations of three expert dentists showed that the method is robust. It achieved an average performance of <93% in Dice similarity, specificity, and sensitivity.

Paper Details

Date Published: 18 November 2015
PDF: 8 pages
J. Med. Imag. 2(4) 044003 doi: 10.1117/1.JMI.2.4.044003
Published in: Journal of Medical Imaging Volume 2, Issue 4
Show Author Affiliations
Amir Hossein Abdi, Sharif Univ. of Technology (Iran, Islamic Republic of)
Shohreh Kasaei, Sharif Univ. of Technology (Iran)
Mojdeh Mehdizadeh, Isfahan Univ. of Medical Sciences (Iran)

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