Automatic detection of apical roots in oral radiographs

Yi Wu; Fangfang Xie; Jie Yang; Erkang Cheng; Vasileios Megalooikonomou; Haibin Ling

doi:10.1117/12.911743

23 February 2012 Automatic detection of apical roots in oral radiographs

Yi Wu, Fangfang Xie, Jie Yang, Erkang Cheng, Vasileios Megalooikonomou, Haibin Ling

Proceedings Volume 8315, Medical Imaging 2012: Computer-Aided Diagnosis; 83152M (2012) https://doi.org/10.1117/12.911743
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

The apical root regions play an important role in analysis and diagnosis of many oral diseases. Automatic detection of such regions is consequently the first step toward computer-aided diagnosis of these diseases. In this paper we propose an automatic method for periapical root region detection by using the state-of-theart machine learning approaches. Specifically, we have adapted the AdaBoost classifier for apical root detection. One challenge in the task is the lack of training cases especially for diseased ones. To handle this problem, we boost the training set by including more root regions that are close to the annotated ones and decompose the original images to randomly generate negative samples. Based on these training samples, the Adaboost algorithm in combination with Haar wavelets is utilized in this task to train an apical root detector. The learned detector usually generates a large amount of true and false positives. In order to reduce the number of false positives, a confidence score for each candidate detection result is calculated for further purification. We first merge the detected regions by combining tightly overlapped detected candidate regions and then we use the confidence scores from the Adaboost detector to eliminate the false positives. The proposed method is evaluated on a dataset containing 39 annotated digitized oral X-Ray images from 21 patients. The experimental results show that our approach can achieve promising detection accuracy.

Citation Download Citation

Yi Wu, Fangfang Xie, Jie Yang, Erkang Cheng, Vasileios Megalooikonomou, and Haibin Ling "Automatic detection of apical roots in oral radiographs", Proc. SPIE 8315, Medical Imaging 2012: Computer-Aided Diagnosis, 83152M (23 February 2012); https://doi.org/10.1117/12.911743

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KEYWORDS

Sensors

X-ray imaging

X-rays

Detection and tracking algorithms

Machine learning

Medical imaging

Radiography

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