Image Processing

Automatic segmentation of mandible in panoramic x-ray

[+] Author Affiliations
Amir Hossein Abdi, Shohreh Kasaei

Sharif University of Technology, Department of Computer Engineering, Azadi Ave., Tehran 11155-9517, Iran

Mojdeh Mehdizadeh

Isfahan University of Medical Sciences, School of Dentistry, Department of Maxillofacial Radiology, Isfahan 81595-158, Iran

J. Med. Imag. 2(4), 044003 (Nov 18, 2015). doi:10.1117/1.JMI.2.4.044003
History: Received July 9, 2015; Accepted October 19, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Amir Hossein Abdi ; Shohreh Kasaei and Mojdeh Mehdizadeh
"Automatic segmentation of mandible in panoramic x-ray", J. Med. Imag. 2(4), 044003 (Nov 18, 2015). ; http://dx.doi.org/10.1117/1.JMI.2.4.044003


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