Systems and methods for determining a position of a focal spot of an X-ray source

• US 10,462,888 B2
• Filed: 08/31/2017
• Issued: 10/29/2019
• Est. Priority Date: 05/31/2017
• Status: Active Grant

• Current Assignee: Shanghai United Imaging Healthcare Co., Ltd.
• Original Assignee: Shanghai United Imaging Healthcare Co., Ltd.
• Inventors: Guo, Songchao
• Primary Examiner(s): Gaworecki, Mark R
• Application Number:
  US15/693,328
• Publication Number:
  US 20180352638A1
• Time in Patent Office: 789 Days
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4021 involving movement of the focal spot
• CPC Class Codes: A61B 6/5258 involving detection or reduction of artifacts or noise
• CPC Class Codes: A61B 6/547 involving tracking of position of the device or parts of the device
• CPC Class Codes: G01T 1/00 Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation G01T3/00, G01T5/00 take precedence
• CPC Class Codes: G01T 1/29 Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
• CPC Class Codes: G21K 1/10 Scattering devices; Absorbing devices; Ionising radiation filters
• CPC Class Codes: H05G 1/02 Constructional details
• CPC Class Codes: H05G 1/26 Measuring, controlling or protecting measuring X-ray radiation G01T

Abstract

A system and method for determining a position of a focal spot of an X-ray source may be provided. The system may include a shelter to attenuate X-rays emitted from the focal spot of the X-ray source and an X-ray receiver to receive X-rays. The X-ray receiver may include a plurality of X-ray receiving regions. At least one of the plurality of X-ray receiving regions may X-rays that include attenuated X-rays by the shelter and unattenuated X-rays. The shelter and the X-ray receiver may reside between the X-ray source and an X-ray detector for determining the position of the focal spot.

Claims

1. A system for determining a position of a focal spot of an X-ray source, comprising:

a tracking device radiated by the X-ray source, the tracking device including;

a shelter configured to attenuate X-rays emitted from the focal spot of the X-ray source; and

an X-ray receiver including a plurality of X-ray receiving regions configured to receive X-rays, at least one of the plurality of X-ray receiving regions receiving X-rays that include attenuated X-rays by the shelter and unattenuated X-rays, wherein the shelter and the X-ray receiver are separated by a distance.

2. The system of claim 1, wherein the shelter and the X-ray receiver are configured to reside between the X-ray source and an X-ray detector for determining the position of the focal spot.

3. The system of claim 1, further comprising:

a storage device storing a set of instructions; and

at least one processor in communication with the storage device, wherein when executing the instructions, the at least one processor is configured to cause the system to;

determine an intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions, the X-rays that strike the at least one of the plurality of X-ray receiving regions including attenuated X-rays by the shelter and unattenuated X-rays; and

determine, based on the determined intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions, the position of the focal spot of the X-ray source.

4. The system of claim 3, wherein the plurality of X-ray receiving regions include two X-ray receiving regions arranged in a first direction and two X-ray receiving regions arranged in a second direction, the first direction being perpendicular to the second direction.

5. The system of claim 4, wherein one of the two X-ray receiving regions arranged in the first direction is partially overlapped with one of the two X-ray receiving regions arranged in the second direction.

6. The system of claim 4, wherein to determine the intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions includes to:

determine a first intensity of the X-rays that strike each of the two X-ray receiving regions arranged in the first direction; and

determine a second intensity of the X-rays that strike each of the two X-ray receiving regions arranged in the second direction.

7. The system of claim 6, wherein to determine, based on the determined intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions, the position of the focal spot of the X-ray source includes to:

determine, based on the first intensities, a position of the focal spot in the first direction,

determine, based on the second intensities, a position of the focal spot in the second direction, and

determine, based on the position of the focal spot in the first direction and the position of the focal spot in the second direction, the position of the focal spot.

8. The system of claim 7, wherein to determine the position of the focal spot in the first direction includes to:

determine the position of the focal spot in the first direction based on a relationship between positions of the focal spot and distributions of intensities of the X-rays that strike the at least one of the plurality of X-ray receiving regions.

9. The system of claim 7, wherein to determine the position of the focal spot in the first direction includes to:

determine the position of the focal spot in the first direction based on a difference between the intensities of the X-rays that strike at least two of the plurality of X-ray receiving regions.

10. The system of claim 7, wherein to determine the position of the focal spot in the first direction includes to:

determine the position of the focal spot in the first direction based on a ratio between the intensities of the X-rays that strike at least two of the plurality of X-ray receiving regions.

11. The system of claim 1, wherein the shelter has a shape of a cross, a rectangle, a circle, or a triangle.

12. The system of claim 1, wherein at least a portion of the at least one of the plurality of X-ray receiving regions receives the unattenuated X-rays emitted from the focal spot of the X-ray source.

13. A method for determining a position of a focal spot of an X-ray source, comprising:

attenuating, by a shelter, X-rays emitted from the focal spot of the X-ray source,

receiving, by an X-ray receiver, X-rays that include the attenuated X-rays by the shelter and unattenuated X-rays, the X-ray receiver having a plurality of X-ray receiving regions;

determining, by at least a processor, an intensity of the X-rays that strike at least one of the plurality of X-ray receiving regions; and

determining, based on the determined intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions, the position of the focal spot of the X-ray source.

14. The method of claim 13, wherein the shelter has a shape of a cross, a rectangle, a circle, or a triangle.

15. The method of claim 13, wherein the plurality of X-ray receiving regions include two X-ray receiving regions arranged in a first direction and two X-ray receiving regions arranged in a second direction, the first direction being perpendicular to the second direction.

16. The method of claim 15, wherein one of the two X-ray receiving regions arranged in the first direction is partially overlapped with one of the two X-ray receiving regions arranged in the second direction.

17. The method of claim 15, wherein

determining the intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions includes:

determining a first intensity of the X-rays that strike each of the two X-ray receiving regions arranged in the first direction, and

determining a second intensity of the X-rays that strike each of the two X-ray receiving regions arranged in the second direction; and

determining, based on the determined intensity of the X-rays that strike the at least one of the plurality of X-ray receiving regions, the position of the focal spot of the X-ray source includes;

determining, based on the first intensities, a position of the focal spot in the first direction,

determining, based on the second intensities, a position of the focal spot in the second direction, and

determining, based on the position of the focal spot in the first direction and the position of the focal spot in the second direction, the position of the focal spot.

18. The method of claim 17, wherein determining the position of the focal spot in the first direction includes:

determining the position of the focal spot in the first direction based on a relationship between positions of the focal spot and distributions of intensities of the X-rays that strike the at least one of the plurality of X-ray receiving regions.

19. The method of claim 17, wherein determining the position of the focal spot in the first direction includes:

determining the position of the focal spot in the first direction based on a difference between the intensities of the X-rays that strike at least two of the plurality of X-ray receiving regions.

20. The method of claim 17, wherein determining the position of the focal spot in the first direction includes:

determining the position of the focal spot in the first direction based on a ratio between the intensities of the X-rays that strike at least two of the plurality of X-ray receiving regions.