Patent ID: 8005185

Claim:
A method to determine phase (x 0 ) and/or amplitude (I amp ) and/or median value (I med ) of an intensity curve I(x) of interfering, adjacent x-ray beams after an analysis grating depending on a relative displacement of a grating or of an examination subject in a detector pixel in an x-ray grating interferometer or x-ray phase contrast CT or an x-ray dark field radiography system, comprising the steps of: irradiating the examination subject with at least two coherent or quasi-coherent x-rays; generating of an interference of the at least two coherent or quasi-coherent x-rays with the aid of an irradiated phase grating; in a processor, determining properties of the intensity curve I(x) of interfering x-ray radiation after an analysis grating in relation to known relative displacements of a grating upstream or of the examination subject or of an x-ray source fashioned as a grating and positioned upstream in the beam path, said displacements being relative to at least one of the analysis grating, the grating upstream of the examination subject, or the x-ray source fashioned as a grating; executing at least three integrating intensity measurements to determine the properties of the intensity curve; and executing all integrating intensity measurements during a relative movement of one of the upstream gratings or of the subject or of the x-ray source fashioned as a grating with known speed behavior over a final time interval or a final distance.