A method of quantifying a medical image is disclosed herein. The method of quantifying a medical image includes acquiring regions of interest based on a medical image； filtering the sizes of the acquired regions of interest using length scale analysis； classifying the regions of interest whose sizes have been filtered, according to the sizes of the regions of interest； and visualizing the regions of interest whose sizes have been filtered, so that the regions of interest whose sizes have been filtered are distinguished from each other in the medical image according to the sizes of the regions of interest.
