1. Metrics and textural features of MRI diffusion to improve classification of pediatric posterior fossa tumors.
- Author
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Rodriguez Gutierrez D, Awwad A, Meijer L, Manita M, Jaspan T, Dineen RA, Grundy RG, and Auer DP
- Subjects
- Adolescent, Algorithms, Artificial Intelligence, Astrocytoma classification, Child, Child, Preschool, Diagnosis, Differential, Ependymoma classification, Female, Humans, Image Interpretation, Computer-Assisted methods, Infant, Infratentorial Neoplasms classification, Male, Medulloblastoma classification, Reproducibility of Results, Sensitivity and Specificity, Astrocytoma pathology, Diffusion Magnetic Resonance Imaging methods, Ependymoma pathology, Image Enhancement methods, Infratentorial Neoplasms pathology, Medulloblastoma pathology, Pattern Recognition, Automated methods
- Abstract
Background and Purpose: Qualitative radiologic MR imaging review affords limited differentiation among types of pediatric posterior fossa brain tumors and cannot detect histologic or molecular subtypes, which could help to stratify treatment. This study aimed to improve current posterior fossa discrimination of histologic tumor type by using support vector machine classifiers on quantitative MR imaging features., Materials and Methods: This retrospective study included preoperative MRI in 40 children with posterior fossa tumors (17 medulloblastomas, 16 pilocytic astrocytomas, and 7 ependymomas). Shape, histogram, and textural features were computed from contrast-enhanced T2WI and T1WI and diffusivity (ADC) maps. Combinations of features were used to train tumor-type-specific classifiers for medulloblastoma, pilocytic astrocytoma, and ependymoma types in separation and as a joint posterior fossa classifier. A tumor-subtype classifier was also produced for classic medulloblastoma. The performance of different classifiers was assessed and compared by using randomly selected subsets of training and test data., Results: ADC histogram features (25th and 75th percentiles and skewness) yielded the best classification of tumor type (on average >95.8% of medulloblastomas, >96.9% of pilocytic astrocytomas, and >94.3% of ependymomas by using 8 training samples). The resulting joint posterior fossa classifier correctly assigned >91.4% of the posterior fossa tumors. For subtype classification, 89.4% of classic medulloblastomas were correctly classified on the basis of ADC texture features extracted from the Gray-Level Co-Occurence Matrix., Conclusions: Support vector machine-based classifiers using ADC histogram features yielded very good discrimination among pediatric posterior fossa tumor types, and ADC textural features show promise for further subtype discrimination. These findings suggest an added diagnostic value of quantitative feature analysis of diffusion MR imaging in pediatric neuro-oncology., (© 2014 by American Journal of Neuroradiology.)
- Published
- 2014
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