Dilated Convolutions for Brain Tumor Segmentation in MRI Scans

We present a novel method to detect and segment brain tumors in Magnetic Resonance Imaging scans using a novel network based on the Dilated Residual Network. Dilated convolutions provide efficient multi-scale analysis for dense prediction tasks without losing resolution by downsampling the input. To the best of our knowledge, our work is the first to evaluate a dilated residual network for brain tumor segmentation in magnetic resonance imaging scans. We train and evaluate our method on the Brain Tumor Segmentation (BraTS) 2017 challenge dataset. To address the severe label imbalance in the data, we adopt a balanced, patch-based sampling approach for training. An ablation study establishes the importance of residual connections in the performance of our network.

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