Tumor Segmentation from Multimodal MRI Using Random Forest with Superpixel and Tensor Based Feature Extraction.

Identification and localization of brain tumor tissues plays an important role in diagnosis and treatment planning of gliomas. A fully automated superpixel wise two-stage tumor tissue segmentation algorithm using random forest is proposed in this paper. First stage is used to identify total tumor and the second stage to segment sub-regions. Features for random forest classifier are extracted by constructing a tensor from multimodal MRI data and applying multi-linear singular value decomposition. The proposed method is tested on BRATS 2017 validation and test dataset. The first stage model has a Dice score of 83% for the whole tumor on the validation dataset. The total model achieves a performance of 77%, 50% and 61% Dice scores for whole tumor, enhancing tumor and tumor core, respectively on the test dataset.