title: An improved method for liver diseases detection by ultrasound image analysis.
abstract: Ultrasound imaging is a popular and noninvasive tool frequently used in the diagnoses of liver diseases. A system to characterize normal, fatty and heterogeneous liver, using textural analysis of liver Ultrasound images, is proposed in this paper. The proposed approach is able to select the optimum regions of interest of the liver images. These optimum regions of interests are analyzed by two level wavelet packet transform to extract some statistical features, namely, median, standard deviation, and interquartile range. Discrimination between heterogeneous, fatty and normal livers is performed in a hierarchical approach in the classification stage. This stage, first, classifies focal and diffused livers and then distinguishes between fatty and normal ones. Support vector machine and k-nearest neighbor classifiers have been used to classify the images into three groups, and their performance is compared. The Support vector machine classifier outperformed the compared classifier, attaining an overall accuracy of 97.9%, with a sensitivity of 100%, 100% and 95.1% for the heterogeneous, fatty and normal class, respectively. The Acc obtained by the proposed computer-aided diagnostic system is quite promising and suggests that the proposed system can be used in a clinical environment to support radiologists and experts in liver diseases interpretation.
authors.affiliation: Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran.
authors.forename: Mehri
authors.initials: M
authors.lastname: Owjimehr
authors.affiliation: Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran.
authors.forename: Habibollah
authors.initials: H
authors.lastname: Danyali
authors.affiliation: Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran.
authors.forename: Mohammad Sadegh
authors.initials: MS
authors.lastname: Helfroush
keywords: Automatic segmentation; fatty liver disease; hierarchical classification; wavelet packet transform