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Quality of Radiomic Features in Glioblastoma Multiforme: Impact of Semi-Automated Tumor Segmentation Software

  • Lee, Myungeun (Center for Medical-IT Convergence Technology Research, Advanced Institutes of Convergence Technology, Seoul National University) ;
  • Woo, Boyeong (Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University) ;
  • Kuo, Michael D. (Department of Electronic and Computer Engineering, National Chiao Tung University) ;
  • Jamshidi, Neema (Department of Radiological Sciences, University of California) ;
  • Kim, Jong Hyo (Center for Medical-IT Convergence Technology Research, Advanced Institutes of Convergence Technology, Seoul National University)
  • Received : 2016.07.28
  • Accepted : 2016.12.27
  • Published : 2017.06.01

Abstract

Objective: The purpose of this study was to evaluate the reliability and quality of radiomic features in glioblastoma multiforme (GBM) derived from tumor volumes obtained with semi-automated tumor segmentation software. Materials and Methods: MR images of 45 GBM patients (29 males, 16 females) were downloaded from The Cancer Imaging Archive, in which post-contrast T1-weighted imaging and fluid-attenuated inversion recovery MR sequences were used. Two raters independently segmented the tumors using two semi-automated segmentation tools (TumorPrism3D and 3D Slicer). Regions of interest corresponding to contrast-enhancing lesion, necrotic portions, and non-enhancing T2 high signal intensity component were segmented for each tumor. A total of 180 imaging features were extracted, and their quality was evaluated in terms of stability, normalized dynamic range (NDR), and redundancy, using intra-class correlation coefficients, cluster consensus, and Rand Statistic. Results: Our study results showed that most of the radiomic features in GBM were highly stable. Over 90% of 180 features showed good stability (intra-class correlation coefficient [ICC] ${\geq}0.8$), whereas only 7 features were of poor stability (ICC < 0.5). Most first order statistics and morphometric features showed moderate-to-high NDR (4 > NDR ${\geq}1$), while above 35% of the texture features showed poor NDR (< 1). Features were shown to cluster into only 5 groups, indicating that they were highly redundant. Conclusion: The use of semi-automated software tools provided sufficiently reliable tumor segmentation and feature stability; thus helping to overcome the inherent inter-rater and intra-rater variability of user intervention. However, certain aspects of feature quality, including NDR and redundancy, need to be assessed for determination of representative signature features before further development of radiomics.

Acknowledgement

Supported by : National Research Foundation of Korea (NRF), Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI)

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