Phenotypic characterization of glioblastoma identified through shape descriptors

Ahmad Chaddad; Christian Desrosiers; Matthew Toews

doi:10.1117/12.2209121

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24 March 2016 Phenotypic characterization of glioblastoma identified through shape descriptors

Ahmad Chaddad, Christian Desrosiers, Matthew Toews

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Proceedings Volume 9785, Medical Imaging 2016: Computer-Aided Diagnosis; 97852M (2016) https://doi.org/10.1117/12.2209121
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

This paper proposes quantitatively describing the shape of glioblastoma (GBM) tissue phenotypes as a set of shape features derived from segmentations, for the purposes of discriminating between GBM phenotypes and monitoring tumor progression. GBM patients were identified from the Cancer Genome Atlas, and quantitative MR imaging data were obtained from the Cancer Imaging Archive. Three GBM tissue phenotypes are considered including necrosis, active tumor and edema/invasion. Volumetric tissue segmentations are obtained from registered T1˗weighted (T1˗WI) postcontrast and fluid-attenuated inversion recovery (FLAIR) MRI modalities. Shape features are computed from respective tissue phenotype segmentations, and a Kruskal-Wallis test was employed to select features capable of classification with a significance level of p < 0.05. Several classifier models are employed to distinguish phenotypes, where a leave-one-out cross-validation was performed. Eight features were found statistically significant for classifying GBM phenotypes with p <0.05, orientation is uninformative. Quantitative evaluations show the SVM results in the highest classification accuracy of 87.50%, sensitivity of 94.59% and specificity of 92.77%. In summary, the shape descriptors proposed in this work show high performance in predicting GBM tissue phenotypes. They are thus closely linked to morphological characteristics of GBM phenotypes and could potentially be used in a computer assisted labeling system.

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Ahmad Chaddad, Christian Desrosiers, and Matthew Toews "Phenotypic characterization of glioblastoma identified through shape descriptors", Proc. SPIE 9785, Medical Imaging 2016: Computer-Aided Diagnosis, 97852M (24 March 2016); https://doi.org/10.1117/12.2209121

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