Method to determine phase and/or amplitude between interfering, adjacent x-ray beams in a detector pixel in a talbot interferometer

A method to determine phase (x0) and/or amplitude (Iamp) and/or median value (Imed) of an intensity curve (Ix) 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 like a grating and positioned upstream in the beam path, said displacements being relative to at least one of the gratings;
• 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 like a grating with known speed behavior over a final time interval or a final distance.