新疆哈薩克族食管癌X射線圖像計算機輔助診斷技術(shù)的研究
[Abstract]:Objective: to study the techniques and methods involved in computer-aided diagnosis of esophageal carcinoma in Kazak nationality in Xinjiang, in order to provide practical reference information for radiologists to make diagnosis decisions. To improve the accuracy and efficiency of diagnosis of esophageal cancer in Kazak nationality in Xinjiang. Methods: using MATLAB image processing software, the region of interest of esophageal X-ray image was manually selected, and the median filter denoising and histogram equalization were performed to improve the image quality, and the gray level co-occurrence matrix was extracted based on gray histogram. The grayscale gradient co-occurrence matrix is Tamura texture, wavelet frequency domain and Hu moment invariant feature, and a two-step feature selection method combining area selection method under ROC curve and principal component analysis is proposed to optimize the feature selection. Using Lib-SVM toolbox, 10 fold cross validation, select SVM based on RBF kernel function, for normal esophagus and pathological esophagus image, mushroom type, The classification of invasive and ulcerative esophageal X-ray images was studied. The accuracy of classification and the AUC value of area under the ROC curve were used to evaluate the performance of the classifier. Results: a total of 66 dimensional features were extracted and 28 dimensional features were selected according to the principle of AUC value greater than 0. 7 under the ROC curve. On this basis principal component analysis was carried out and the first 10 principal components with cumulative contribution rate of 90.33% were selected. For normal esophagus and pathological esophagus, the classification accuracy and AUC value were 92.67% and 92.70%, respectively. The classification time was 2.40 s. The classification accuracy and AUC value of invasive and ulcerative esophageal carcinoma images were 90.67% and 91.00%, respectively, and the classification time was 2.80 s. The classification accuracy and AUC value of pathological esophageal images were 88.50 and 7.70 s respectively. The classification accuracy and AUC value of invasive and ulcerative esophageal carcinoma images were 88.40% and 88.53, respectively. The classification time was 9.70 s. When the AUC value was greater than 0.7, the normal esophagus was classified. The classification accuracy and AUC value of pathological esophageal images were 94.17% and 94.20%, respectively, and the classification time was 2.80 s. The classification accuracy and AUC value of invasive and ulcerative esophageal carcinoma images were 92.33% and 92.30%, respectively, and the operating time of classification was 4.50 s. The classification accuracy and AUC value of pathological esophageal images were 95.33% and 95.00%, respectively, and the classification time was 1.50 s, and the classification accuracy and AUC value of fungote, infiltrative and ulcerative esophageal carcinoma images were 94.59% and 94.00%, respectively, and the running time of classification was 2.30 s. Conclusion: in this study, the X-ray images of normal esophagus, mushroom type, infiltrating type and ulcerative type of esophageal carcinoma were extracted, selected and classified, and the method of combining two-step feature selection with SVM was used. It can provide valuable reference for radiologists and help them to diagnose esophageal cancer better. It lays a foundation for the development of the computer aided diagnosis system for Xinjiang Kazak nationality esophageal cancer.
【學(xué)位授予單位】:新疆醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:R735.1
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