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Examples of segmentation results overlay on manual segmentation (green). FLAIR image with tumour grade II (a1), grade II (a2), grade III (a3) and grade IV (a4); b1–b4 manual segmentation; c1–c4 results using SVM; and d1–d4 results using ERT. Both SVM- and ERT-based methods obtained satisfactory results for the segmentation of different tumour types, with ERT-based method providing slightly better results than that from SVM
