A level set method based on the Bayesian risk for medical image segmentation

Authors:
Yao-Tien Chen
Affiliations:
Department of Computer Science and Information Engineering, Yuanpei University, No. 306, Yuanpei St., Hsinchu City 30015, Taiwan
Venue:
Pattern Recognition
Year:
2010

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Abstract

This paper proposes an alternative criterion derived from the Bayesian risk classification error for image segmentation. The proposed model introduces a region-based force determined through the difference of the posterior image densities for the different classes, a term based on the prior probability derived from Kullback-Leibler information number, and a regularity term adopted to avoid the generation of excessively irregular and small segmented regions. Compared with other level set methods, the proposed approach relies on the optimum decision of pixel classification and the estimates of prior probabilities; thus the approach has more reliability in theory and practice. Experiments show that the proposed approach is able to extract the complicated shapes of targets and robust for various types of medical images. Moreover, the algorithm can be easily extendable for multiphase segmentation.