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Examples demonstrating the data preprocessing. (A) Example of a whole-slide histopathology image (WSI) of a brain tumor sample imaged at 40× magnification. (B) A tile sized 1024 × 1024 pixels is extracted from the WSI at 20× magnification. (C) The background is removed in order to calculate the percentage of tissue present on the tile. Tiles with tissue percentage more than 90% were included in model development or evaluation.
