A medical imaging apparatus and a method of operating the same are provided. The method includes acquiring three-dimensional (3D) volume data about an object, generating a 3D image based on the 3D volume data, extracting a muscle tissue figure corresponding to a muscle tissue shape of the object by grouping voxels included in the 3D image, analyzing a motion of the object based on the extracted muscle tissue figure, and displaying the extracted muscle tissue figure and a result of the analysis.