title: Three-dimensional SVM with latent variable: application for detection of lung lesions in CT images.
abstract: The study aims to improve the performance of current computer-aided schemes for the detection of lung lesions, especially the low-contrast in gray density or irregular in shape. The relative position between suspected lesion and whole lung is, for the first time, added as a latent feature to enrich current Three-dimensional (3D) features such as shape, texture. Subsequently, 3D matrix patterns-based Support Vector Machine (SVM) with the latent variable, referred to as L-SVM3Dmatrix, was constructed accordingly. A CT image database containing 750 abnormal cases with 1050 lesions was used to train and evaluate several similar computer-aided detection (CAD) schemes: traditional features-based SVM (SVMfeature), 3D matrix patterns-based SVM (SVM3Dmatrix) and L-SVM3Dmatrix. The classifier performances were evaluated by computing the area under the ROC curve (AUC), using a 5-fold cross-validation. The L-SVM3Dmatrix sensitivity was 93.0 with 1.23% percentage of False Positive (FP), the SVM3Dmatrix sensitivity was 88.4 with 1.49% percentage of FP, and the SVMfeature sensitivity was 87.2 with 1.78% percentage of FP. The L-SVM3Dmatrix outperformed other current lung CAD schemes, especially regarding the difficult lesions.
authors.affiliation: School of Information Engineering, Northeast Dianli University, Jilin, 132012, China, wangqingzhu198339@163.com.
authors.forename: Qingzhu
authors.initials: Q
authors.lastname: Wang
authors.forename: Wenchao
authors.initials: W
authors.lastname: Zhu
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
mesh_terms: D000465:Algorithms; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis*; D008175:Lung Neoplasms / Q000175:diagnosis; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D060388:Support Vector Machine; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*