X-ray imaging apparatus with continuous, periodic movement of the radiation detector in the exposure plane

• US 7,236,572 B2
• Filed: 05/28/2004
• Issued: 06/26/2007
• Est. Priority Date: 05/30/2003
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Maschke, Michael
• Primary Examiner(s): Glick; Edward J.
• Assistant Examiner(s): Artman; Thomas R.
• Application Number:
  US10/856,228
• Publication Number:
  US 20050002486A1
• Time in Patent Office: 1,124 Days
• Field of Search: 378/62, 378/98.8, 378/146
• US Class Current: 378/146
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]

Abstract

An economical X-ray apparatus that allows a rapid exposure of comparatively large-format digital X-ray images has an exposure unit, with which a predetermined surface segment of an exposure plane can be exposed with X-ray radiation, and a digital X-ray detector that is moved in the exposure plane, with the X-ray detector being continuously periodically driven.

Claims

1. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a predetermined surface segment of an exposure plane with X-rays;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region along two directions of said detector region perpendicular to one another;

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said detector region, in a continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size; and

a displacement unit connected to said exposure unit for moving said exposure unit for displacing said surface segment synchronously with said X-ray detector in said exposure plane.

2. An X-ray apparatus as claimed in claim 1 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

3. An X-ray apparatus as claimed in claim 1 wherein said drive arrangement moves said X-ray detecotor in said continuosly periodic motion by traslation oscillating said X-ray deteector.

4. An X-ray apparatus as claimed in claim 1 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.

5. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a predetermined surface segment of an exposure plane with X-rays, said detector region having an edge and a detector surfaces;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region alona two directions of said detector region perpendicular to one another; and

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said detector region, in a continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size, said drive arrangement moving said X-ray detector in said continuously periodic motion by rotating said X-ray detector in a single circular direction around an axis of rotation, said axis of rotation being disposed substantially at said edge of said detector region and being perpendicular to said detection surface.

6. An X-ray apparatus as claimed in claim 5 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

7. An X-ray apparatus as claimed in claim 5 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.

8. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a predetermined surface segment of an exposure plane with X-rays, said detector region having an edge and a detection surface;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region along two direction of said detector region perpendicular to one another; and

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said detector region, in continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size, said drive arrangement moving said X-ray detector in said continuous periodic motion by oscillating said detector region around an axis of rotation, said axis of rotation being situated substantially at said edge of said detector region and being perpendicular to said detection surface.

9. An X-ray apparatus as claimed in claim 8 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

10. An X-ray apparatus as claimed in claim 8 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.

11. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a predetermined surface segment of an exposure plane with X-rays;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region along two directions of said detector region perpendicular to one another; and

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said detector region, in a continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size, said drive arrangement comprising a conveyor belt and moving said X-ray detector in said continuous periodic motion by unidirectionally moving said X-ray detector along a closed loop path of said conveyor belt.

12. An X-ray apparatus as claimed in claim 11 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

13. An X-ray apparatus as claimed in claim 11 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.

14. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a perdetermined surface segment of an exposure plane with X-rays, said exposure unit comprising an X-ray source for emitting an X-ray beam propagting in beam direction, and a diaphram system having a diaphram movable perpendicularly to said beam direction for gating said X-ray beam to set a position of said surface segment;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region along two directions of said detector region perpendicular to one another;

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said region, in a continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size; and

a displacement unit connected to said diaphram system for moving said diaphram in a continuously periodic motion identical to the continuously periodic motion of said X-ray detector.

15. An X-ray apparatus as claimed in claim 14 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

16. An X-ray apparatus as claimed in claim 14 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.

17. An X-ray apparatus comprising:

an X-ray exposure unit for exposing a predetermined surface segment of an exposure plane with X-rays;

a digital flat panel X-ray detector, having a rectilinear detector region with a detector size that is active to simultaneously detect said X-rays anywhere within said detector region along two directions of said detector region perpendicular to one another; and

a drive arrangement connected to said digital flat panel X-ray detector for moving an entirety of said flat panel X-ray detector, and thus an entirety of said detector region, in a continuously periodic motion to detect said x-rays within a rectilinear area larger than said detector size, said drive arrangement, by moving said X-ray detector in said continuously periodic motion, causing said X-ray detector to, at times, not coincide with said surface segment, and said exposure unit comprising an X-ray source and a voltage generator for driving said X-ray source, said voltage generator driving said X-ray source in a pulsed manner for causing said X-ray source to emit X-rays at a first power outside of said times and at a second power within said times, said second power being lower than said first power.

18. An X-ray apparatus as claimed in claim 17 wherein said exposure unit comprises an X-ray source for emitting an X-ray beam and a diaphragm system disposed in a propagation path of said X-ray beam, said diaphragm system having a diaphragm movable perpendicular to said propagation path for gating said X-ray beam to set a size of said surface segment.

19. An X-ray apparatus as claimed in claim 17 wherein said X-ray detector, during said continuous periodic motion, produces a plurality of partial images respectively obtained at different positions of said X-ray detector in said continuous periodic motion, and wherein said X-ray apparatus comprises an evaluation unit supplied with said partial images for forming an overall complete image from said partial images.