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Proceedings Paper

Automated contralateral subtraction of dental panoramic radiographs for detecting abnormalities in paranasal sinus
Author(s): Takeshi Hara; Shintaro Mori; Takashi Kaneda; Tatsuro Hayashi; Akitoshi Katsumata; Hiroshi Fujita
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Paper Abstract

Inflammation in the paranasal sinus is often observed in seasonal allergic rhinitis or with colds, but is also an indication for odontogenic tumors, carcinoma of the maxillary sinus or a maxillary cyst. The detection of those findings in dental panoramic radiographs is not difficult for radiologists, but general dentists may miss the findings since they focus on treatments of teeth. The purpose of this work is to develop a contralateral subtraction method for detecting the odontogenic sinusitis region on dental panoramic radiographs. We developed a contralateral subtraction technique in paranasal sinus region, consisting of 1) image filtering of the smoothing and sobel operation for noise reduction and edge extraction, 2) image registration of mirrored image by using mutual information, and 3) image display method of subtracted pixel data. We employed 56 cases (24 normal and 32 abnormal). The abnormal regions and the normal cases were verified by a board-certified radiologist using CT scans. Observer studies with and without subtraction images were performed for 9 readers. The true-positive rate at a 50% confidence level in 7 out of 9 readers was improved, but there was no statistical significance in the difference of area-under-curve (AUC) in each radiologist. In conclusion, the contralateral subtraction images of dental panoramic radiographs may improve the detection rate of abnormal regions in paranasal sinus.

Paper Details

Date Published: 9 March 2011
PDF: 6 pages
Proc. SPIE 7963, Medical Imaging 2011: Computer-Aided Diagnosis, 79632R (9 March 2011); doi: 10.1117/12.878581
Show Author Affiliations
Takeshi Hara, Gifu Univ. (Japan)
Shintaro Mori, Nihon Univ. (Japan)
Takashi Kaneda, Nihon Univ. (Japan)
Tatsuro Hayashi, Gifu Univ. (Japan)
Akitoshi Katsumata, Asahi Univ. (Japan)
Hiroshi Fujita, Gifu Univ. (Japan)

Published in SPIE Proceedings Vol. 7963:
Medical Imaging 2011: Computer-Aided Diagnosis
Ronald M. Summers M.D.; Bram van Ginneken, Editor(s)

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