1. A method for three-dimensional image reconstruction from measurement data obtained from an examination subject, comprising the steps of: providing an X-ray source and a surface radiation detector; respectively disposing said X-ray source and said surface radiation detector on opposite sides of an examination subject and rotating said X-ray source and said surface radiation detector around said examination subject while irradiating said examination subject with X-rays from said X-ray source, to obtain measurement data corresponding to attenuated X-ray intensities at said surface radiation detector; supplying said measurement data to a computer; and in said computer, reconstructing a three-dimensional image of a volume of said examination subject by filtered back-projection with convolution employing a convolution kernel having a central component and components outside of said central component corresponding to an exponential function.