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This paper proposes a new image binarization method that uses a simple standard deviation approach and gives us very good results for MRI of brain images. The problem of binarization of gray MRI images due to the black background and large intensity variation has been overcome by our proposed method. This method is very useful to extract the objects of interest from an image and, hence, to distinguish the foreground (brain) from the background (black background). The threshold of the image is determined by standard deviation multiplied by a heuristic value. The paper describes the details including the heuristic value used as well as the performance of this method along with some other well known image binarization method.