Method for producing projective and tomographic phase contrast images with the aid of an x-ray system
AssigneeSiemens Aktiengesellschaft
InventorsStefan Popescu, Bjorn Heismann, Eckhard Hempel
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Abstract
A method is disclosed for producing projective and tomographic phase contrast images of an examination object, preferably a patient, with the aid of an X-ray system, and a corresponding X-ray system for carrying out this method. In at least one embodiment of the method, X-ray optical grating sets tuned to different energy ranges are used to determine energy-dependent phase shifts upon penetration of an examination object, a difference value is formed from these energy-dependent phase shifts, and tomographic or projective images are produced therefrom.
Claims48
A method for producing at least one of projective and tomographic images of an examination object using an X-ray system or X-ray CT system, comprising:
- measuring a phase shift of an X-radiation penetrating the examination object in an energy-specific fashion with reference to at least two different energy ranges;
- and
- forming recorded values as a function of the energy-specific phase shifts.
An X-ray CT system for producing tomographic phase contrast images, comprising:
- at least one focus/detector system arranged on at least one of a gantry and a C arc to rotate about an examination object;
- and
- a set of transirradiated X-ray optical gratings between the focus and detector, including at least one source grating, at least two phase gratings alternately movable into the beam path, and an analyzer grating.
An X-ray CT system for producing tomographic phase contrast images, comprising:
- at least two focus/detector systems arranged on at least one of a gantry and a C arc to rotate about an examination object;
- and
- for each focus/detector system, a set of transirradiated X-ray optical gratings, dimensioned in an energy-specific fashion, between the focus and detector and including a source grating, a phase grating and an analyzer grating.
A focus/detector system of an X-ray apparatus, comprising:
- a radiation source with a focus and an opposing planar detector with a multiplicity of detector elements;
- and
- a set of transirradiated X-ray optical gratings of parallel alignment, arranged between the focus and detector and by which the phase shift in the radiation upon penetration of the examination object is measureable in a beamwise resolved fashion, the grating set including
- at least one source grating arranged between the at least one focus and the examination object,
- at least two phase gratings arrangeable between the examination object and the detector and alternately introduceable into the beam path,
- an analyzer grating arranged upstream of the detector, and
- an apparatus for the relative displacement of the analyzer grating with reference to the phase gratings in a fashion perpendicular to the beam direction and perpendicular to the longitudinal direction of the grating lines.
Dependencies are inferred from the claim text.