In a method, an evaluation computer, and a medical imaging apparatus for evaluating medical images of an organ system of an examination subject, wherein the organ system has a first side and a second side that are characteristically bilaterally symmetrical to one another, first and second medical image datasets of the organ system of the examination subject are acquired and processed to obtain a result image dataset by a global image data subtraction in which image components of the first and second medical image data are subtracted from one another, and a symmetry subtraction in which image components of the first side and the second side of the organ system are subtracted from one another within a medical image dataset.
