X-ray diagnostics installation

• US 5,598,454 A
• Filed: 04/11/1995
• Issued: 01/28/1997
• Est. Priority Date: 04/26/1994
• Status: Expired due to Fees

• Current Assignee: Sirona Dental Systems GmbH (Sirona Dental Systems Incorporated)
• Original Assignee: Siemens AG
• Inventors: Guenther, Werner, Ploetz, Josef, Franetzki, Manfred
• Primary Examiner(s): Porta, David P.
• Application Number:
  US08/420,215
• Time in Patent Office: 658 Days
• Field of Search: 378/170, 378/206, 378/168, 378/177, 378/178, 378/208
• US Class Current: 378/206
• CPC Class Codes: A61B 6/51 for dentistry

Abstract

An x-ray diagnostics installation includes a device for positioning a radiation emitter such that the reference ray of an emitted ray beam always and automatically intersects a reference axis that is stationary with reference to said device at an acute angle α when the radiation emitter is coupled to the device. X-ray exposures for tomosynthesis can thus be produced in a simple way.

Claims

1. An x-ray tomosynthesis installation for use in producing an image of a focal plane of a subject, comprising:

a penetrating radiation emitter which emits a beam of penetrating radiation including a reference ray;

means for coupling said radiation emitter at a plurality of different positions along a circular arc, said circular arc having a nter on said reference axis for always and automatically positioning said radiation emitter so that said reference ray intersects a reference axis perpendicular to said focal plane, at a non-zero acute angle; and

means for defining said reference axis so as to be stationary with respect to said means for positioning.

2. An x-ray tomosynthesis installation as claimed in claim 1 wherein said positioning means further comprises means for setting said acute angle to a selected angular value.

3. An x-ray tomosynthesis installation as claimed in claim 1 further comprising a radiation receiver, and means for defining a distance between said means for positioning and said radiation receiver.

4. An x-ray tomosynthesis installation as claimed in claim 1 further comprising a stand, and means for mounting at least one of said radiation emitter and said means for positioning on said stand.

5. An x-ray tomosynthesis installation as claimed in claim 4 further comprising a seat for a subject to be examined using said radiation emitter, and means for pivotably mounting said seat to said stand.

6. An x-ray tomosynthesis installation as claimed in claim 4 further comprising means for movably supporting said stand.

7. An x-ray tomosynthesis installation as claimed in claim 1 further comprising means for positioning an examination subject for a dental examination using said radiation emitter.

8. An x-ray tomosynthesis installation comprising:

a radiation emitter which emits a beam of penetrating radiation including a reference ray;

means coupled to said radiation emitter for rotating said radiation emitter around a reference axis to irradiate an examination subject with said penetrating radiation from a plurality of different annular positions and for always and automatically maintaining said radiation emitter at each annular position so that said reference ray intersects said reference axis at the same acute angle; and

means for defining said reference axis stationary with respect to said means for positioning.

9. An x-ray tomosynthesis installation for use in producing an image of a focal plane of a subject, comprising:

a penetrating radiation emitter which emits a beam of penetrating radiation including a reference ray;

means, including a disk coupled to said radiation emitter, for always and automatically positioning said radiation emitter so that said reference ray intersects a reference axis, perpendicular to said focal plane, at a non-zero acute angle, said disk having a recess therein for accepting said radiation emitter and a center through which said reference axis extends, and said means for positioning including means for mounting said disk for rotation around said center and said reference axis.

10. An x-ray tomosynthesis installation as claimed in claim 9 further comprising drive means for rotating said disk around said center and said reference axis.

11. An x-ray tomosynthesis installation as claimed in claim 9 further comprising a housing containing said radiation emitter and said means for positioning.

12. An x-ray tomosynthesis installation as claimed in claim 9 wherein said radiation emitter has a projecting tube through which said penetrating radiation is emitted, and wherein said disk has a recess for accepting said projecting tube.

13. An x-ray tomosynthesis installation for use in producing an image of a focal plane of a subject, comprising:

a penetrating radiation emitter which emits a beam of penetrating radiation including a reference ray;

means, including a disk coupled to said radiation emitter, for always and automatically positioning said radiation emitter so that said reference ray intersects a reference axis, perpendicular to said focal plane, at a non-zero acute angle, said disk having at least two recesses for respectively accepting said radiation emitter, said reference ray intersecting said reference axis from a first direction when said radiation emitter is accepted in one of said recesses and said reference ray intersecting said reference axis from a second, different direction when said radiation emitter is accepted in the other of said recesses; and

means for defining said reference axis so as to be stationary with respect to said means for positioning.

14. An x-ray tomosynthesis installation as claimed in claim 13 wherein said means for positioning comprises an annular disk having an inside edge, and wherein said recesses respectively comprise circular segments disposed at said inside edge.

15. An x-ray tomosynthesis installation as claimed in claim 13 wherein said means for positioning comprises an annular disk having an outside edge, and wherein said recesses respectively comprise circular segments at said outside edge.

16. An x-ray tomosynthesis installation for use in producing an image of a focal plane of a subject, comprising:

a penetrating radiation emitter which emits a beam of penetrating radiation from a focus;

means for coupling said radiation emitter at a plurality of different positions along a circular arc, said circular arc having a nter on said reference axis for always and automatically positioning said radiation emitter so that said reference ray intersects a reference axis perpendicular to said focal plane, at a non-zero acute angle;

means for defining said reference axis so as to be stationary with respect to said means for positioning;

radiation receiver means for detecting radiation emitted by said radiation emitter after penetrating an examination subject, and

bracket means for mounting said radiation receiver means at predetermined distance from said examination subject, from said means for positioning, and from said focus.

17. An x-ray tomosynthesis installation as claimed in claim 16 wherein said radiation receiver means has a middle region, and wherein said bracket means comprises means for mounting said radiation receiver means a distance from said focus for causing said reference ray to be incident on said middle region of said radiation receiver means and for disposing said radiation receiver means at a point on said reference axis intersected by said reference ray.

18. An x-ray tomosynthesis installation as claimed in claim 17 further comprising means for positioning an examination subject for a dental examination using said radiation emitter.