Method and system for X-ray imaging

• US 7,885,375 B2
• Filed: 10/20/2008
• Issued: 02/08/2011
• Est. Priority Date: 02/27/2004
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Bernard De Man, Bruno Kristiaan, Sanza, Peter Claudius, Harrison, Daniel David, Sengupta, Souma, Yin, Zhye, Smyth, Brian Patrick, Iatrou, Maria, Basu, Samit Kumar
• Primary Examiner(s): Song; Hoon
• Application Number:
  US12/254,732
• Publication Number:
  US 20090161816A1
• Time in Patent Office: 841 Days
• Field of Search: 378/9, 378/10, 378/12, 378/122
• US Class Current: 378/9
• CPC Class Codes: A61B 6/027 characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4014 arranged in multiple source-detector units
• CPC Class Codes: A61B 6/4028 resulting in acquisition of views from substantially different positions, e.g. EBCT
• CPC Class Codes: A61B 6/4085 Cone-beams
• CPC Class Codes: A61B 6/4266 characterised by using a plurality of detector units A61B6/4014 takes precedence

Abstract

A technique is provided for imaging a field of view using an X-ray source comprising two or more emission points. The two or more emission points may be independently operated. Independent operation of the two or more emission points in performed in accordance with a list of commands that specifies the operation of the emission points. The list of commands, in one embodiment, is stored in a sequence buffer. In other embodiments, the list of commands is generated for a given usage, without being stored in a sequence buffer.

Claims

1. A CT imaging system comprising:

a solid-state or thermionic X-ray source comprising a plurality of discrete X-ray emission focal spots, wherein the solid-state or thermionic X-ray source is configured as a stationary ring or as a stationary or rotating array of the discrete X-ray emission focal spots;

one or more detectors configured to detect X-rays emitted by the plurality of X-ray emission focal spots;

an X-ray controller configured to independently operate the plurality of discrete X-ray emission focal spots;

a data acquisition system configured to readout signals from the one or more detectors; and

a sequence buffer which, when at least the X-ray controller is operated, physically encodes a list of commands controlling the operation of the X-ray controller, wherein the size of the sequence buffer is based at least in part on the length and number of commands physically encoded in the sequence buffer.

2. The CT imaging system of claim 1, wherein the sequence buffer physically encodes a second list of commands controlling the operation of the data acquisition system.

3. The CT imaging system of claim 2, wherein the second list of commands includes one or more of a command instructing the data acquisition system to adjust a sampling period, to begin data readout, or to cease data readout.

4. The CT imaging system of claim 1, wherein the solid-state or thermionic X-ray source comprises a distributed X-ray source in which the respective emission points are separated by distances of 30 cm or less.

5. The CT imaging system of claim 1, wherein the list of commands includes one or more commands instructing the X-ray controller to activate a respective X-ray emission focal spot at a specified time or in a specified sequence, at a specified mA, for a specified duration, at a specified focal spot size, at a specified interval after a trigger, at a specified energy, or at a specified kVp.

6. The CT imaging system of claim 1, wherein each command of the list of commands corresponds to the operation an X-ray emission focal spot at a respective view.

7. The CT imaging system of claim 1, wherein each X-ray emission from the plurality of discrete X-ray emission focal spots is defined by a different command of the list of commands.

8. A sequence buffer comprising:

a data storage structure;

a command sequence physically encoded on the data storage structure, wherein the command sequence comprises instructions for independently operating a plurality of X-ray emission focal spots of a distributed X-ray source.

9. The sequence buffer of claim 8, wherein the command sequence further comprises instructions for operating a data acquisition system for reading out data from one or more detectors.

10. The sequence buffer of claim 9, wherein the instructions for operating the data acquisition system comprise instructions for adjust a sampling period, for beginning data readout, or for ceasing data readout.

11. The sequence buffer of claim 8, wherein the instructions for independently operating the plurality of X-ray emission focal spots comprise instructions for activating a respective X-ray emission focal spot at a specified time or in a specified sequence, at a specified mA, for a specified duration, at a specified interval after a trigger, at a specified energy, at a specific focal spot size, or at a specified kVp.

12. The sequence buffer of claim 8, wherein the data storage structure comprises a solid state memory device, an optical storage medium, or a magnetic storage medium.

13. A method comprising:

processing a list of commands related to the operation of an imaging system;

individually operating a plurality of X-ray focal spots of a distributed X-ray source in accordance with the list of commands.

14. The method of claim 13, wherein individually operating the plurality of X-ray focal spots comprises activating the X-ray focal spots in a non-uniform manner with respect to one or more of sequence, mA, kVp, or duration.

15. The method of claim 13, wherein individually operating the plurality of X-ray focal spots comprises activating two or more X-ray focal spots simultaneously.

16. The method of claim 13, wherein individually operating the plurality of X-ray focal spots comprises activating and deactivating the X-ray focal spots to reduce half-scan over-scan.

17. The method of claim 13, wherein individually operating the plurality of X-ray focal spots comprises activating and deactivating the X-ray focal spots to reduce helical over-scan.

18. The method of claim 13, comprising operating a data acquisition system in accordance with the list of commands.

19. The method of claim 18, wherein operating the data acquisition system comprises conditionally reading out one or more detectors.

20. The method of claim 18, wherein operating the data acquisition system comprises beginning data acquisition based on a gantry position and/or a cardiac phase signal.

21. The method of claim 13, wherein the list of commands are stored in a buffer.

22. The method of claim 13, wherein the list of commands are generated using feedback based on measured X-ray levels at a detector.

23. A method comprising:

providing a distributed X-ray source comprising a plurality of discrete and separately operable X-ray emission focal spots;

providing one or more detectors configured to generate signals in response to X-rays emitted by the distributed X-ray source;

providing a sequence buffer capable of storing a list of commands for operating the plurality of X-ray emission focal spots;

electrically connecting an X-ray controller to the distributed X-ray source and the sequence buffer, wherein the X-ray controller is capable of independently operating the plurality X-ray emission focal spots in accordance with the list of commands; and

electrically connecting a data acquisition system to the one or more detectors, wherein the data acquisition system is capable of reading out the signals generated by the one or more detectors.

24. The method of claim 23, wherein the data acquisition system is operated in accordance with the list of commands.