title: A novel approach to segment and classify regional lymph nodes on computed tomography images.
abstract: Morphology of lymph nodal metastasis is critical for diagnosis and prognosis of cancer patients. However, accurate prediction of lymph node type based on morphological information is rarely available due to lack of pathological validation. To obtain correct morphological information, lymph nodes must be segmented from computed tomography (CT) image accurately. In this paper we described a novel approach to segment and predict the status of lymph nodes from CT images and confirmed the diagnostic performance by clinical pathological results. We firstly removed noise and preserved edge details using a revised nonlinear diffusion equation, and secondly we used a repulsive-force-based snake method to segment the lymph nodes. Morphological measurements for the characterization of the node status were obtained from the segmented node image. These measurements were further selected to derive a highly representative set of node status, called feature vector. Finally, classical classification scheme based on support vector machine model was employed to simulate the prediction of nodal status. Experiments on real clinical rectal cancer data showed that the prediction performance with the proposed framework is highly consistent with pathological results. Therefore, this novel algorithm is promising for status prediction of lymph nodes.
authors.affiliation: School of Computer Science and Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Hongmin
authors.initials: H
authors.lastname: Cai
authors.forename: Chunyan
authors.initials: C
authors.lastname: Cui
authors.forename: Haiying
authors.initials: H
authors.lastname: Tian
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Li
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004058:Diffusion; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis / Q000175:diagnosis*; D008962:Models, Theoretical; D009369:Neoplasms / Q000175:diagnosis / Q000473:pathology*; D017711:Nonlinear Dynamics; D016011:Normal Distribution; D011379:Prognosis; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D060388:Support Vector Machine; D014057:Tomography, X-Ray Computed / Q000379:methods*