Classification of Emphysema Subtypes: Comparative Assessment of Local Binary Patterns and Related Texture FeaturesReport as inadecuate




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The purpose of this study was to assess usefulness of local binary patterns LBP and related texture features, namely completed local binary patterns CLBP and local ternary patterns LTP, for the classification of emphysema subtypes on low-dose CT images. Fifty patients 34 men and 16 women; age, 67.5 ± 10.1 years who underwent low-dose CT 60 mAs were included. They were comprised of 17 never smokers, 13 smokers without COPD, and 20 smokers with COPD. By consensus reading of low-dose CT images from these patients, two radiologists selected 3681 nonoverlapping regions of interest ROIs and annotated them as one of the following three classes: normal tissue, centrilobular emphysema, and paraseptal emphysema. From these ROIs, histogram of CT densities, LBP, CLBP, and LTP were calculated, and the 3 types of texture histograms were concatenated with the CT density histogram. These 3 types of histograms referred to as combined LBP, combined CLBP, and combined LTP were used to classify ROI using linear support vector machine. For each type of the combined histogram, the accuracy of classification was determined by patient-based 10-fold cross validation. The best accuracy of combined LBP, combined CLBP, and combined LTP were 81.36%, 82.99%, and 83.29%, respectively. Compared to the classification accuracies obtained with combined LBP, those with combined LTP or combined CLBP were consistently improved. In conclusion, the results of this study suggest that, on low-dose CT, LTP and CLBP were more useful for the classification of emphysema subtypes than LBP.

KEYWORDS

Emphysema, COPD, Texture Analysis, Low-Dose CT

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Nishio, M. , Koyama, H. , Ohno, Y. and Sugimura, K. 2015 Classification of Emphysema Subtypes: Comparative Assessment of Local Binary Patterns and Related Texture Features. Advances in Computed Tomography, 4, 47-55. doi: 10.4236-act.2015.43007.





Author: Mizuho Nishio1,2*, Hisanobu Koyama3, Yoshiharu Ohno1,2, Kazuro Sugimura3

Source: http://www.scirp.org/



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