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Machine learning based differentiation of glioblastoma from brain metastasis using MRI derived radiomics

Authors
  • Priya, Sarv1
  • Liu, Yanan2
  • Ward, Caitlin2
  • Le, Nam H.2
  • Soni, Neetu1
  • Pillenahalli Maheshwarappa, Ravishankar1
  • Monga, Varun3
  • Zhang, Honghai2
  • Sonka, Milan2
  • Bathla, Girish1
  • 1 University of Iowa Hospital and Clinics, 200 Hawkins Drive, Iowa City, IA, 52242, USA , Iowa City (United States)
  • 2 University of Iowa, Iowa City, IA, USA , Iowa City (United States)
  • 3 University of Iowa Hospitals and Clinics, Iowa City, IA, USA , Iowa City (United States)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
May 18, 2021
Volume
11
Issue
1
Identifiers
DOI: 10.1038/s41598-021-90032-w
Source
Springer Nature
License
Green

Abstract

Few studies have addressed radiomics based differentiation of Glioblastoma (GBM) and intracranial metastatic disease (IMD). However, the effect of different tumor masks, comparison of single versus multiparametric MRI (mp-MRI) or select combination of sequences remains undefined. We cross-compared multiple radiomics based machine learning (ML) models using mp-MRI to determine optimized configurations. Our retrospective study included 60 GBM and 60 IMD patients. Forty-five combinations of ML models and feature reduction strategies were assessed for features extracted from whole tumor and edema masks using mp-MRI [T1W, T2W, T1-contrast enhanced (T1-CE), ADC, FLAIR], individual MRI sequences and combined T1-CE and FLAIR sequences. Model performance was assessed using receiver operating characteristic curve. For mp-MRI, the best model was LASSO model fit using full feature set (AUC 0.953). FLAIR was the best individual sequence (LASSO-full feature set, AUC 0.951). For combined T1-CE/FLAIR sequence, adaBoost-full feature set was the best performer (AUC 0.951). No significant difference was seen between top models across all scenarios, including models using FLAIR only, mp-MRI and combined T1-CE/FLAIR sequence. Top features were extracted from both the whole tumor and edema masks. Shape sphericity is an important discriminating feature.

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