Aided Diagnosis of Bone Lesions

We present a system for computer aided diagnosis of bone tumors in the facial skeleton. There are many diierent lesions with ra-diographic manifestation in the jaws. Our system helps performing the diierential diagnosis of these. The input is a digitized orthopantomo-graph (OPG) in which the user marks the position of the lesion with a single mouse click. An active contour model then automatically nds the boundaries of the lesion. Gray-level histograms, MRSAR texture features and Gabor lter features are computed for the lesion region. These features are then combined and used to query a database containing expert-diagnosed reference cases. The result is a number of similar cases, with tumor position marked and with available expert annotations. We show good agreement between our results and diierential diagnosis given by humans. The system is also a suitable tool for training and education.