1. A method of generating a personalized parameter value for generating a medical image, the method comprising: determining, using a computer, a first standard parameter value corresponding to a first medical image containing an object imaged according to a predetermined parameter value and a second standard parameter value corresponding to a second medical image where the second medical image is a post-corrected image of the first medical image; generating, using the computer, a personalized parameter value on a basis of the first standard parameter value and the second standard parameter value where the personalized parameter value is optimized for the object using one of a ratio and a difference between the first and second standard parameters; and generating, using the computer, a visible image containing the object where the personalized parameter value is optimized for the object, wherein the visible image is a visible image produced by X-ray radiation.