Systems and related methods for stationary digital chest tomosynthesis (s-DCT) imaging

• US 10,980,494 B2
• Filed: 10/19/2015
• Issued: 04/20/2021
• Est. Priority Date: 10/20/2014
• Status: Active Grant

• Current Assignee: University of North Carolina At Chapel Hill (University of North Carolina System)
• Original Assignee: University of North Carolina At Chapel Hill (University of North Carolina System)
• Inventors: Lu, Jianping, Shan, Jing, Lee, Yueh, Zhou, Otto Z., Calliste, Jabari, Inscoe, Christina, Chtcheprov, Pavel, Tucker, Andrew
• Primary Examiner(s): Ip, Jason M
• Application Number:
  US14/886,842
• Publication Number:
  US 20160106382A1
• Time in Patent Office: 2,010 Days
• CPC Class Codes: A61B 6/025 Tomosynthesis
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: A61B 6/4007 characterised by using a plurality of source units
• CPC Class Codes: A61B 6/4085 Cone-beams
• CPC Class Codes: A61B 6/482 involving multiple energy imaging
• CPC Class Codes: A61B 6/488 involving pre-scan acquisition
• CPC Class Codes: A61B 6/502 for diagnosis of breast, i.e. mammography
• CPC Class Codes: A61B 6/5205 involving processing of raw data to produce diagnostic data
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal

Abstract

Systems and related methods for stationary digital chest tomosynthesis (s-DCT) imaging are disclosed. In some aspects, systems include a stationary x-ray source array with an array of x-ray pixels configured to generate x-ray beams at different viewing angles relative to a subject to be imaged that is stationary, a stationary area x-ray detector configured to record x-ray projection images of the subject, a physiological gating apparatus for monitoring at least one physiological signal of the subject and defining a physiological phase and a time window based on the at least one physiological signal, and a computing platform configured to activate the x-ray pixels based on the physiological phase and the time window and upon receipt of the at least one physiological signal from the physiological gating apparatus in order to synchronize x-ray exposure with the at least one physiological signal of the subject.

Claims

1. A system for stationary x-ray digital tomosynthesis imaging, the system comprising:

a stationary x-ray source array comprising an array of spatially distributed x-ray pixels configured to generate x-ray beams at different viewing angles relative to a stationary imaging subject;

a stationary area x-ray detector positioned parallel to a plane of the x-ray source array and configured to record x-ray projection images of the subject from the different viewing angles for tomosynthesis reconstruction;

one or more physiological gating sensor for monitoring at least one physiological signal of the subject, the one or more physiological gating sensor defining a physiological phase and a time window based on the at least one physiological signal during which the x-ray projection images of the subject from the different viewing angles are acquirable;

a computing platform comprising at least one hardware processor and a memory, the computing platform being configured to activate the x-ray pixels at approximately a same phase point in the time window for each viewing angle based on the physiological phase and the time window and upon receipt of the at least one physiological signal from the one or more physiological gating sensor in order to synchronize x-ray exposure with the at least one physiological signal of the subject; and

a collimator attached to the stationary x-ray source array, the collimator comprising a plurality of openings, wherein each of the plurality of openings is configured to collimate radiation generated from a corresponding focal spot on an anode of the stationary x-ray source array into a cone beam that illuminates the area x-ray detector.

2. The system of claim 1, wherein the computing platform is configured to process acquired x-ray projection images of the subject from the different viewing angles and reconstruct one or more three dimensional (3D) tomosynthesis slice images of the subject.

3. The system of claim 1, wherein the at least one physiological signal comprises a respiratory signal, such that a full tomosynthesis scan is completed either within a single respiratory cycle or over multiple respiratory cycles of the subject.

4. The system of claim 1, wherein the one or more physiological gating sensor is configured to monitor at least two physiological signals, the two physiological signals including a respiratory signal and a cardiac signal, and wherein either one or both signals are gated to trigger acquisition of the x-ray projection images of the subject from the different viewing angles.

5. The system of claim 1, wherein the x-ray source array comprises a distributed multiple beam carbon nanotube cathode array.

6. The system of claim 1, further comprising an anti-scattering grid, placed in a plane parallel to and in between the subject and the x-ray source array, wherein a plurality of openings disposed on the anti-scattering grid are focused to linearly distribute one or more focal spot on an anode of the x-ray source array.

7. The system of claim 1, wherein the x-ray source array comprises a central x-ray source array with varying focal spot size and permissible power for different focal spot on an anode of the x-ray source array.

8. The system of claim 1, wherein the x-ray source array comprises a cylindrical anode configured to rotate around a central rotational axis and configured to increase thermal power of the x-ray source array.

9. The system of claim 1, wherein the computing platform is configured to control the x-ray pixels of the x-ray source array in order to perform dual energy or multiple energy tomosynthesis imaging.

10. The system of claim 1, wherein the computing platform is further configured to determine a number of projection views, angular coverage, x-ray energy, and image radiation dose based on a scout view image of the subject taken prior to a tomosynthesis scan.

11. The system of claim 1, wherein the x-ray source array comprises between, and including, about 3 and 90 x-ray pixels covering one or more viewing angle between, and including about, about 10 degrees and 90 degrees.

12. The system of claim 1, wherein the system is a stationary digital chest tomosynthesis (s-DCT) imaging system for lung cancer imaging applications.

13. The system of claim 1, further comprising a position sensing device comprising one or more emitter and one or more receptors, the position sensing device being configured to interface with the computing platform to determine a relative position of the area x-ray detector with respect to the x-ray source array.

14. The system of claim 13, wherein the position sensing device comprises one or more emitter disposed on the area x-ray detector and one or more receiver disposed on the x-ray source array, and wherein the one or more emitter is configured to emit a signal and the one or more receiver is configured to detect the signal.

15. The system of claim 13, wherein the position sensing device comprises one or more emitter and one or more receiver both disposed on the x-ray source array, and wherein the one or more receiver is configured to detect a signal emitted by the one or more emitter that is reflected by a structure disposed on the area x-ray detector.

20. The system of claim 1 further comprising a primary beam sampling apparatus configured to estimate and subtract scatter photons from the x-ray projection images.

16. A method for stationary x-ray digital tomosynthesis imaging, the method comprising:

providing a stationary x-ray source array comprising an array of spatially distributed x-ray pixels configured to generate x-ray beams at different viewing angles relative to a subject that is stationary, and providing a stationary area x-ray detector positioned substantially parallel to a plane of the x-ray source array and configured to record x-ray projection images of the subject from the different viewing angles for tomosynthesis reconstruction;

monitoring, by one or more physiological gating apparatus sensors, at least one physiological signal of the subject, the physiological gating sensor apparatus defining a physiological phase and a time window based on the at least one physiological signal during which the x-ray projection images of the subject from the different viewing angles are acquirable;

activating, by a computing platform, the x-ray pixels at approximately a same phase point in the time window for each viewing angle and upon receiving the at least one physiological signal in order to synchronize x-ray exposure with the at least one physiological signal of the subject;

recording x-ray projection images of the subject from the different viewing angles; and

using a collimator to collimate radiation generated from a corresponding focal spot on an anode of the stationary x-ray source array into a cone beam that illuminates the area x-ray detector, wherein the collimator is attached to the stationary x-ray source array, and wherein the collimator comprises a plurality of openings, each opening being configured to collimate a corresponding focal spot on an anode of the stationary x-ray source array.

17. The method of claim 16, further comprising processing, by the computing platform, acquired x-ray projection images of the subject from the different viewing angles and reconstruct one or more three dimensional (3D) tomosynthesis slice images of the subject.

18. The method of claim 16, wherein the at least one physiological signal comprises a respiratory signal, such that a full tomosynthesis scan is completed either within a single respiratory cycle or over multiple respiratory cycles of the subject.

19. The method of claim 16, further comprising monitoring at least two physiological signals, the two physiological signals including a respiratory signal and a cardiac signal, and wherein either one or both signals are gated to trigger acquisition of the x-ray projection images of the subject from the different viewing angles.

21. The method of claim 16 further comprising estimating and subtracting scatter photons from the x-ray projection images using a primary beam sampling apparatus.

22. The method of claim 16 further comprising increasing thermal power of the x-ray source array using a cylindrical anode configured to rotate around a central rotational axis.