1. A method for determining a movement phase of a periodically moving object, the method comprising: providing a plurality of sequentially produced images in a series of images of the moving object; registering, via a computer unit, different images in the series of images; determining, via the computer unit, a deformation that has occurred between the registered images; forming, via the computer unit, a signal indicative of the deformation between the registered images; and determining, via the computer unit, the movement phase of the moving object for at least one of the plurality of sequentially produced images in the series of images using a Hilbert transformation on the signal.