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Feature Selection and Performance Evaluation of Support Vector Machine (SVM)-Based Classifier for Differentiating Benign and Malignant Pulmonary Nodules by Computed Tomography

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Abstract

There are lots of work being done to develop computer-assisted diagnosis and detection (CAD) technologies and systems to improve the diagnostic quality for pulmonary nodules. Another way to improve accuracy of diagnosis on new images is to recall or find images with similar features from archived historical images which already have confirmed diagnostic results, and the content-based image retrieval (CBIR) technology has been proposed for this purpose. In this paper, we present a method to find and select texture features of solitary pulmonary nodules (SPNs) detected by computed tomography (CT) and evaluate the performance of support vector machine (SVM)-based classifiers in differentiating benign from malignant SPNs. Seventy-seven biopsy-confirmed CT cases of SPNs were included in this study. A total of 67 features were extracted by a feature extraction procedure, and around 25 features were finally selected after 300 genetic generations. We constructed the SVM-based classifier with the selected features and evaluated the performance of the classifier by comparing the classification results of the SVM-based classifier with six senior radiologists′ observations. The evaluation results not only showed that most of the selected features are characteristics frequently considered by radiologists and used in CAD analyses previously reported in classifying SPNs, but also indicated that some newly found features have important contribution in differentiating benign from malignant SPNs in SVM-based feature space. The results of this research can be used to build the highly efficient feature index of a CBIR system for CT images with pulmonary nodules.

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Acknowledgements

The project was supported by the grants from the National Nature Science Foundation of China (grant no. 30570512) and Shanghai Science and Technology Committee (grant no. 064119658, 06SN07111). The authors would like to thank Dr. Xiaojun Ge for providing the CT images used in this study.

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Authors and Affiliations

  1. Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China

    Yanjie Zhu, Yongqiang Tan & Jianguo Zhang

  2. Department of Radiology, Huadong Hospital, Shanghai, China

    Yanqing Hua, Mingpeng Wang & Guozhen Zhang

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  1. Yanjie Zhu
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  2. Yongqiang Tan
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  3. Yanqing Hua
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  4. Mingpeng Wang
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  5. Guozhen Zhang
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  6. Jianguo Zhang
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Correspondence to Jianguo Zhang.

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Zhu, Y., Tan, Y., Hua, Y. et al. Feature Selection and Performance Evaluation of Support Vector Machine (SVM)-Based Classifier for Differentiating Benign and Malignant Pulmonary Nodules by Computed Tomography. J Digit Imaging 23, 51–65 (2010). https://doi.org/10.1007/s10278-009-9185-9

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  • DOI: https://doi.org/10.1007/s10278-009-9185-9

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