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论文类型： 期刊论文

发表时间： 2009-12-01

发表刊物： COMPUTERIZED MEDICAL IMAGING AND GRAPHICS

收录刊物： SCIE、EI、PubMed、Scopus

卷号： 33

期号： 8

页面范围： 588-592

ISSN号： 0895-6111

关键字： NN classifier; Texture feature; Hepatocellular carcinoma; Animal; Superparamagnetic iron oxide; Magnetic resonance imaging

摘要： In this paper, a computer-aided diagnostic (CAD) system for the classification of rat liver lesions from MR imaging is presented. The proposed system consists of two modules: the feature extraction and the classification modules. 40 rats are used for hepatocellular carcinoma (HCC) induction with Diethylnitrosamine via drinking water. After Resovist is administrated by tail vein the animals are scanned by a 1.5-T MR scanner with T2-weighted FRFSE sequence. SPIO-enhanced images of 106 nodules (RNs: 24, HCCs: 82) are acquired, and 161 regions of interest (ROIs) are taken from the MR images. Six parameters of texture characteristics including Angular Second Moment, Contrast, Correlation, Inverse Difference Moment, Entropy, and Variance of 161 ROIs are calculated and assessed by gray-level co-occurrence matrices, then fed into a BP neural network (NN) classifier to classify the liver tissue into two classes: cirrhosis and HCC. Difference of each texture parameter between cirrhosis and HCC group is significant. The accuracy of classification of HCC nodules from cirrhosis is 91.67%. It indicates the ANN classifier based on texture is effective for classifying HCC nodules from cirrhosis on rat SPIO-enhanced imaging. (C) 2009 Elsevier Ltd. All rights reserved.