1. A method for generating three-dimensional, multiply resolved volume images of an examination subject, comprising the steps of: in an exposure procedure, irradiating an examination subject with X-rays from a radiation source and detecting X-rays attenuated by the subject with a radiation receiver and thereby registering a plurality of low-resolution two-dimensional projection images and a plurality of high-resolution two-dimensional projection images, said low resolution projection images and said high-resolution projection images each having a scale and a sampling rate associated therewith; transforming said high-resolution projection images, and still retaining said high-resolution projection images, to produce transformed projection images having a scale and a sampling rate which are the same as the scale and the sampling rate of said low-resolution projection images; and generating a three-dimensional volume image having a low resolution from said low-resolution projection images and said transformed projection images, and generating a three-dimensional volume image with high resolution from said high-resolution projection images.