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The process of the tumor segmentation and feature extraction. The VOIs were manually drawn along the border of the tumor on the DWI (b-value =1,000 s/mm2) with reference to the T2WI. All VOIs were copied and pasted to functional maps. The histogram features of the whole tumor were then extracted. T2WI, T2-weighted imaging; DWI, diffusion-weighted imaging; VOIs, volumes of interest; ADC, apparent diffusion coefficient.
