The Application of Neural Network to Liver Magnetic Resonance Imaging Study

摘要

Magnetic resonance imaging (MRI) of the liver has demonstrated to be quite sensitive in showing Hepatic Hemangioma as high intensity lesions in T2 weighted imaging sequence. Hepatic Hemangioma is a non-malignant tumor and has relative high occurance rate among general population. It is of importance to differentiate this benign abnormality from other high intensity malignant lesions, such as hepatoma, adenocarsinoma or metastasis. The objective of our study was to investigate the feasibility of applying neural network to assist in the differentiation of the liver MRI lesions. Thirty-seven liver MRI studies were collected, this including twenty-three cases of hepatic hamangioma and fourteen cases of maglinant tumors. All cases were clinically proven with the diagnosed pathological condition and verified by biopsy. Four quantitative features, adopted from published literitures and used clinically on a routine basis, were measured from MRI images. In this study, a multilayer and two layer backpropagation network were used for performance comparision. By attempting various training methods, the accuracy of the two layer network had been improved from 74% to 83% by selecting the proper boundary set based on the eclidean distance for each data set in both classes when training the network.