1. An operating method for an image-generating medical engineering assembly having a controller and a recording arrangement, comprising: receiving a selection of an image evaluation method from a user by the controller; providing the user with an instruction for adjusting a positioning-independent operating parameter of the recording arrangement base on the selection; capturing a sequence of successive two-dimensional images of an object being examined and capturing instants of the images as well as a phase signal of the object in response to a start input of the user, the object being an iteratively moving object; and archiving the captured sequence of images, the capturing instants and the phase signal, wherein the controller comprises an evaluation device with the archived captured sequence of images, the capturing instants and the phase signal, wherein the user selects one of the captured sequence of images as a reference image, wherein the evaluation device determines a further image of the captured sequence of images as an evaluation image automatically or based on a user input, wherein the evaluation device automatically draws up a report allocating to the captured sequence based on the reference image and the evaluation image and archives the report, wherein the evaluation device further: automatically selects an image which is captured in the first or last iteration of the object as the reference image, determines a phase position of the phase signal based on a capturing instant of the selected image, outputs the selected image and the determined phase position to the user for a consideration of the reference image, determines the reference image by: designating the selected image as the reference image if the user selects the selected image as the reference image, or selecting a further image captured immediately before or after the selected image, determining a phase position thereof, and outputting the further selected image and the phase position to the user for further consideration of the reference image if the user denies the selected image as the reference image.