Multi-modal PixelNet for Brain Tumor Segmentation

摘要

Brain tumor segmentation using multi-modal MRI data sets is important for diagnosis, surgery and follow up evaluation. In this paper, a convolutional neural network (CNN) with hypercolumns features (e.g. PixelNet) utilizes for automatic brain tumor segmentation containing low and high-grade glioblastomas. Though pixel level convolutional predictors like CNNs, are computationally efficient, such approaches are not statistically efficient during learning precisely because spatial redundancy limits the information learned from neighboring pixels. PixelNet extracts features from multiple layers that correspond to the same pixel and samples a modest number of pixels across a small number of images for each SGD (Stochastic gradient descent) batch update. PixelNet has achieved whole tumor dice accuracy 87.6% and 85.8% for validation and testing data respectively in BraTS 2017 challenge.