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US 9,357,975 B2Granted
Large FOV phase contrast imaging based on detuned configuration including acquisition and reconstruction techniques
AssigneeCarestream Health, Inc.
InventorsPavlo Baturin, Mark E. Shafer
Life of this patent
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Abstract
Embodiments of methods and apparatus are disclosed for obtaining a phase-contrast digital imaging system and methods for same that can include an x-ray source for radiographic imaging; a beam shaping assembly, an x-ray grating interferometer including a phase grating and an analyzer grating; and an x-ray detector; where the source grating, the phase grating, and the analyzer grating are detuned and a plurality of uncorrelated reference images are obtained for use in imaging processing with the detuned system.
Claims19
A method, comprising:
- providing an x-ray source for radiographic imaging;
- providing a beam shaping assembly comprising a source grating G0;
- providing an x-ray grating interferometer comprising a phase grating G1, and an analyzer grating G2;
- providing an x-ray detector;
- aligning the source grating G0, the phase grating G1, the analyzer grating G2, and the x-ray detector;
- offsetting a pitch of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 at a prescribed distance from the phase grating G1 to generate a repeating fringe pattern;
- repeatedly exposing an object using the x-ray source while moving the object relative to at least one cycle of the fringe pattern to generate a set of image data, and while holding the x-ray source, the source grating G0, the phase grating G1, the analyzer grating G2, and the x-ray detector fixed relative to each other;
- and
- capturing a plurality of images of the object by the x-ray detector.
6 more elements
A method, comprising:
- providing an x-ray source for radiographic imaging;
- providing a beam shaping assembly;
- providing an x-ray grating interferometer comprising a phase grating G1, and an analyzer grating G2;
- offsetting a pitch of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 at a prescribed distance from the phase grating G1 to generate a repeatable fringe pattern;
- repeatedly exposing an object using the x-ray source while moving the object relative to at least one cycle of the fringe pattern to generate a set of image data;
- and
- taking a plurality of reference images by an x-ray detector,
- wherein moving the object relative to at least one cycle of the fringe pattern comprises holding the interferometer and the x-ray detector fixed relative to each other while moving the object across the interferometer with a step=npx/M, and wherein n is an integer number (1, 2, 3, . . . ), px is a detector's pixel pitch and M is an image magnification.
5 more elements
A method, comprising:
- providing an x-ray source for radiographic imaging;
- providing a beam shaping assembly;
- providing an x-ray grating interferometer comprising a phase grating G1, and an analyzer grating G2;
- offsetting a pitch of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 at a prescribed distance from the phase grating G1 to generate a repeatable fringe pattern;
- repeatedly exposing an object using the x-ray source while moving the object relative to at least one cycle of the fringe pattern to generate a set of image data;
- and
- taking a plurality of reference images by an x-ray detector,
- wherein the x-ray source, the beam shaping assembly, the grating interferometer, and the detector are attached to a moving arm to operate together, and the moving arm performs a single FOV scan by exposing X sequential positions of the area x-ray detector to obtain a plurality of X raw images used to construct a 3D image, a distance between the X sequential positions=npx/M, and wherein n is an integer number (1, 2, 3, . . . ), px is a detector's pixel pitch and M is an image magnification.
5 more elements
A digital radiographic (DR) phase-contrast imaging (PCI) system comprising:
- an x-ray source;
- a beam shaping assembly comprising a source grating G0;
- an x-ray grating interferometer comprising,
- a phase grating G1, and
- an analyzer grating G2;
- and
- an area x-ray detector;
- wherein a pitch and a position of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 produce a repeated fringe pattern over a width of the analyzer grating G2, the relative position of the x-ray source, the source grating G0, the phase grating G1 the analyzer grating G2, and the x-ray detector does not change for an image scan of an imaging area of the DR PCI system,
- the imaging area is configured to move relative to the repeated fringe pattern during the scan, and wherein the x-ray detector is configured to generate a plurality of uncorrelated reference images.
6 more elements
A digital radiographic (DR) phase-contrast imaging (PCI) system comprising:
- a beam shaping assembly comprising a source grating G0;
- an x-ray grating interferometer comprising,
- a phase grating G1, and
- an analyzer grating G2;
- and
- an area x-ray detector,
- wherein a pitch and a position of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 produce a repeated fringe pattern over a width of the analyzer grating G2, the relative position of the phase grating G1 and the analyzer grating G2 does not change for an image scan of an imaging area of the DR PCI system, the imaging area is configured to move relative to the repeated fringe pattern during the scan, the x-ray detector is configured to generate a plurality of uncorrelated reference images, the object is moved relative to the repeated fringe pattern by holding the interferometer and the x-ray detector fixed relative to each other while moving the imaging area across the interferometer with a step=npx/M, and wherein n is an integer number (1, 2, 3, . . . ), px is a detector's pixel pitch and M is an image magnification.
4 more elements
Dependencies are inferred from the claim text.