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1. WO2007102947 - SYSTÈME ET PROCÉDÉ DE COMMANDE DE POINT DE RAYONS X

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A method for controlling an electron beam in an X-ray tube, comprising:

emitting electrons from an electron source to form the electron beam;

accelerating the electron beam from a cathode through an aperture in a plate;

focusing and steering the electron beam from the aperture through a space between a plurality of field generating plates; and

accelerating the electron beam from the plurality of the field generating plates to an anode.

2. The method of claim 1, wherein emitting the electrons comprises heating a filament.

3. The method of claim 1, wherein accelerating the electron beam from the cathode through the aperture plate comprises a first stage acceleration of the electron beam.

4. The method of claim 3, comprising accelerating the electron beam in the first stage acceleration such that the electron beam attains a first energy.

5. The method of claim 4, wherein accelerating the electron beam from the plurality of the field generating plates comprises a second stage acceleration of the electron beam.

6. The method of claim 5, comprising accelerating the electron beam in the second stage acceleration such that the electron beam attains a second energy, wherein the second energy is greater than the first energy.

7. The method of claim 1, wherein focusing and steering the beam comprises passing the electron beam through a time varying electric quadrupole and dipole fields.

8. The method of claim 7, comprising charging the plurality of field generating plates to generate the time varying electric quadrupole field.

9. An X-ray tube comprising;

an electron source;

a cathode spaced from to the electron source;

an electron beam extraction plate disposed on a side of the cathode opposite the electron source;

a plurality of field generating plates disposed adjacent to the extraction plate and configured to steer an electron beam emanating through the extraction plate; and

an anode configured to receive the steered electron beam.

10. The X-ray tube of claim 9, wherein the electron source comprises a filament.

11. The X-ray tube of claim 9, wherein the electron source comprises a field emitter.

12. The X-ray tube of claim 9, wherein the field generating plates are configured to accelerate the electron beam emanating from the extraction plate through two stages of acceleration.

13. The X-ray tube of claim 9, wherein the plurality of field generating plates are configured to generate electric quadrupole and dipole fields for steering and focusing the electron beam.

14. The X-ray tube of claim 9, wherein the plurality of field generating plates are configured to steer the electron beam such that the electron beam traces across the anode along two dimensions.

15. The X-ray system of claim 9, comprising additional plates disposed adjacent to the field generating plates and configured to create a two-staged electrical potential across the X-ray tube.

16. A computer tomography imaging system comprising:

a gantry: a plurality of X-ray tubes disposed within the gantry, wherein each of the plurality of X-ray tubes comprises:

an electron source;

a cathode spaced from to the electron source;

an electron beam extraction plate disposed on a side of the cathode opposite the electron source;

a plurality of field generating plates disposed adjacent to the extraction plate and configured to steer an electron beam emanating through the extraction plate; and

an anode configured to receive the steered electron beam.

17. The system of claim 16, wherein the gantry is a gantry that does not rotate.

18. The system of claim 16, wherein the field generating plates comprise four plates.

19. The system of claim 18, wherein the four field generating plates are configured to generate an electric quadrupole and dipole fields for steering and focusing the electron beam.

20. The system of claim 17, wherein the electron source comprises a filament.

21. The system of claim 17, comprising an X-ray tube source controller configured to control operation of each of the plurality of X-ray tubes.

22. The system of claim 17, comprising a plurality of detector elements, wherein each of the detector elements is disposed on an opposing side of the gantry to a corresponding one of the X-ray tubes.