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1. WO2013148010 - HYBRID PCI SYSTEM FOR MEDICAL RADIOGRAPHIC IMAGING

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[ EN ]

CLAIMS:

1. hase-contrast digital radiographic imaging system comprising:

a polychromatic x-ray source for radiographic imaging;

a beam shaping assembly comprising a source grating GO, an x-ray grating interferometer comprising

a phase grating Gl, and

an analyzer grating G2; and

where a pitch and a position of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating Gl produce at least one fringe pattern over a width of the analyzer grating G2.

2. The system of claim 1, where the fringe pattern is produced by the pitch of the analyzer grating G2 being unequal to the pitch of an interference pattern produced by the phase grating Gl at a position of the analyzer grating G2, where the analyzer grating G2 is at a Talbot distance or a position to increase contrast at the position of the detector, where the relative position of the phase grating Gl and the analyzer grating G2 does not change for a scan of an object.

3. The system of claim 1, where the fringe pattern is produced by the position of the analyzer grating G2 is offset from a Talbot distance, and where the pitch of the analyzer grating G2 is equal to a pitch of the interference pattern.

4. The system of claim 1, where the phase-contrast digital radiographic imaging system is detuned, and where the relative position of the phase gratings Gl and the analyzer grating G2 does not change for a complete scan of an object.

5. The system of claim 1, where the phase-contrast digital radiographic imaging system is detuned to produce a fringe pattern that is greater than 0.1 cm, or over a significant portion of the analyzer grating G2.

6. The system of claim 1, where N is a number of steps used to cover a period of the analyzer grating G2, and where a scan of the object includes N exposures of at least one portion of the object.

7. The system of claim 1, where the grating Gl, the grating G2 and a detector D can be fixed at one relative position, attached to the swing arm and moved to image the object, where the relative position of the grating Gl and the grating G2 provide a non-zero Δ = fM - f2 , where a frequency (Af) of fringe pattern at the detector can be adjusted, where the analyzer grating G2 can be moved offset relative to the phase grating Gl to adjust the frequency (Af) of fringe pattern at the detector, or the analyzer grating G2 and the detector D can be moved simultaneously together in the direction of the x-ray beam to increase a contrast or adjust the fringe pattern at the detector.

8. The system of claim 1, where the phase-contrast DR imaging system is a slot-scanning phase-contrast DR imaging system, where an orientation of the grating bars of the three gratings GO, Gl, and G2 is parallel to the scan direction of the swing arm, where an image data set from a single pass of the system over an object is used to construct multiple images of the object including at least one of absorption contrast images, differential phase contrast images, phase shift contrast images, and dark-field images.

9. A phase-contrast digital radiographic imaging system comprising:

a polychromatic x-ray source for radiographic imaging;

a beam shaping assembly comprising a source grating GO, an x-ray grating interferometer comprising

a phase grating Gl, and

an analyzer grating G2; and

an area x-ray detector,

where a pitch of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating Gl are unequal at a position of the area x-ray detector, where the relative position of the phase gratings Gl and the analyzer grating G2 does not change for a scan of an object, where N is a number of steps used to cover a period of the analyzer grating G2, and where the scan of the object includes N exposures of at least one portion of the object.

10. A slot-scanning phase-contrast digital radiographic imaging system comprising:

a polychromatic x-ray source for radiographic imaging;

a beam shaping assembly comprising,

a collimator,

a source grating GO,

an x-ray grating interferometer comprising

a phase grating Gl, and

an analyzer grating G2; and

an area x-ray detector; wherein the three gratings (GO, Gl, and G2) are positioned in such a way that the plane and the grating bars of these gratings are aligned to each other.

11. The slot-scanning phase-contrast digital mammography system of claim 10, wherein the x-ray source, the beam shaping assembly, the grating interferometer, and the detector are attached to a swing arm to pivot together around an axis, where the axis is positioned on a side of the source grating GO opposite the analyzer grating G2 including co-axial with a x-ray tube focal spot.

12. The slot-scanning phase-contrast digital mammography system of claim 10, where for each of a plurality of N positions of the analyzer grating G2, the swing arm performs a single FOV scan by exposing M sequential positions of the area x-ray detector to obtain a plurality of raw image data used to construct a 3D image, where M and N are positive integers greater than 4, where the M sequential positions of the area x-ray detector are a plurality of adjacent overlapping positions, where gratings of the analyzer grating G2 are substantially parallel or substantially perpendicular to an x-ray beam path.

13. The slot-scanning phase-contrast digital mammography system of claim 10, where for each of a plurality of N positions of the analyzer grating G2, the swing arm performs a M FOV scans by continuously slot- scanning M portions of the FOV using a CCD detector in TDI mode to obtain a plurality of raw image data used to construct a 3D image, where M and N are positive integers, where the M portions of the FOV are sequentially adjacent positions of the FOV, where gratings of the analyzer grating G2 are substantially parallel to an x-ray beam path.

14. The slot-scanning phase-contrast digital mammography system of claim 10, where the swing arm performs a single FOV scan by exposing M sequential positions of the area x-ray detector, where each of the M sequential positions are exposed for each of a plurality of N positions of the analyzer grating G2 to obtain a plurality of raw image data used to construct a 3D image, where M and N are positive integers, where the M sequential positions of the area x-ray detector are a plurality of adjacent overlapping positions, where gratings of the analyzer grating G2 are substantially parallel or substantially perpendicular to an x-ray beam path.

15. The slot-scanning phase-contrast digital mammography system of claim 10, further comprising a filter, where the detector is an indirect area detector or a direct area detector, where the gratings and detector are curved to match the source x-ray focus, where the phase grating Gl and the analyzer grating G2 have a prescribed angle therebetween, where the analyzer grating G2 can be stepped linearly or stepped rotationally, where an aspect ratio of the second grating and the third grating are each greater than 2: 1.