1. A method for detecting the bright brain regions from computed tomography images, comprising: loading computed tomography images data; deriving the skull images; deriving the brain images; converting said brain images to the lower bit images data; calculating the generalized asymmetry map with respect to the midsagittal plane; calculating grayscale threshold, threshold of local contrast, threshold of asymmetry, and threshold of partial volume voxels for bright brain regions; deriving initial bright brain regions; recovering bright brain voxels symmetrical to the midsagittal plane; refining the initial bright brain regions; checking if the detected BBRs is low or high in average grayscale and the window width being increased or decreased when the detected BBRs is low or high in average grayscale and going back to the converting step; and outputting the bright brain regions.