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CN-121994836-A - Linear CT imaging system and scanning imaging method based on multi-section linear track

CN121994836ACN 121994836 ACN121994836 ACN 121994836ACN-121994836-A

Abstract

The application provides a linear CT imaging system based on multi-section linear tracks, which comprises a conveying device and n scanning sections, wherein the conveying device is used for enabling a scanning object to move along the preset m-section linear tracks, m is a positive integer greater than or equal to 2, each scanning section comprises at least one ray source and at least one detector, n is a positive integer greater than or equal to 2, the two sides of each section of linear track are respectively provided with the ray source and the detector of the at least one scanning section, the ray source is used for emitting ray beams, the detector is used for detecting the ray beams emitted by the ray source and passing through the scanning object, and the scanning fan angle of the at least one scanning section is unequal to the scanning fan angles of the other scanning sections in the n scanning sections.

Inventors

  • ZHANG LI
  • SHEN LE
  • HUANG QINGPING
  • CHANG MING
  • XU XIAOFEI
  • ZHAO ZHENHUA
  • LI LIANG
  • HONG MINGZHI
  • Tian Zonghan

Assignees

  • 同方威视技术股份有限公司
  • 清华大学

Dates

Publication Date
20260508
Application Date
20260330

Claims (20)

  1. 1. A linear CT imaging system based on a multi-segment linear trajectory, the system comprising: a conveying device for making the scanning object move along a preset m sections of linear tracks, wherein m is a positive integer greater than or equal to 2, and N scanning segments, each scanning segment comprising at least one radiation source and at least one detector, wherein n is a positive integer greater than or equal to 2, At least one ray source and at least one detector of the scanning section are respectively arranged at two sides of each section of linear track, the ray source is used for emitting ray beams, and the detector is used for detecting the ray beams emitted by the ray source and passing through the scanning object; Among the n scan segments, the scan fan angle of at least one scan segment is not equal to the scan fan angles of the other scan segments.
  2. 2. The system of claim 1, wherein the scan fan angle of at least one of the n scan segments is less than the scan fan angles of the other scan segments.
  3. 3. The system of claim 1 or 2, wherein the source detection distance of at least one scan segment is not equal to the source detection distance of other scan segments among the n scan segments.
  4. 4. A system according to any one of claims 1-3, wherein the source distance of at least one of the n scan segments is greater than the source distances of the other scan segments.
  5. 5. The system of claim 1 or 2, wherein the source detection distance of at least one of the n scan segments remains unchanged during the scan.
  6. 6. A system according to claim 1 or 2, wherein the source detection distance of at least one of the n scan segments is varied during the scan.
  7. 7. The system of any of claims 1-6, wherein the n scan segments each comprise at least one source and at least one detector that are independent of each other.
  8. 8. The system of any of claims 1-6, wherein at least two of the n scan segments share at least one source of radiation, share at least one detector, or share at least one source of radiation and at least one detector.
  9. 9. The system of any one of claims 1-8, wherein at least two of the m straight-line trajectories are substantially parallel.
  10. 10. The system of claim 9, wherein the angle between the at least two straight-line trajectories is 180 ° and the positions of the at least two straight-line trajectories coincide.
  11. 11. The system of claim 9 or 10, wherein at least two scan segments corresponding to the at least two linear trajectories share at least one source of radiation, the shared at least one source of radiation having a trajectory of motion perpendicular to the at least two linear trajectories, or At least two scanning segments corresponding to the at least two straight-line tracks share at least one detector, the motion track of the at least one detector being shared is perpendicular to the at least two straight-line tracks, or At least two scan segments corresponding to the at least two straight-line trajectories share at least one radiation source and at least one detector, and a relative motion trajectory between the at least one radiation source and the at least one detector, which are shared, is perpendicular to the at least two straight-line trajectories.
  12. 12. The system of any one of claims 1-8, wherein at least two of the m straight-line trajectories intersect.
  13. 13. The system of claim 12, wherein an included angle between the at least two straight trajectories is greater than or equal to 90 ° and less than 180 °.
  14. 14. The system of claim 12 or 13, wherein at least two scan segments corresponding to the at least two straight-line trajectories share at least one source of radiation, the shared at least one source of radiation having a motion trajectory that intersects the at least two straight-line trajectories, respectively, or At least two scanning segments corresponding to the at least two straight-line tracks share at least one detector, and the motion track of the at least one detector which is shared is intersected with the at least two straight-line tracks respectively, or At least two scanning segments corresponding to the at least two straight-line tracks share at least one ray source and at least one detector, and the shared relative motion track between the at least one ray source and the at least one detector is intersected with the at least two straight-line tracks respectively.
  15. 15. The system of claim 6, wherein the source distance of at least one of the n scan segments is progressively increased during the scan, and/or, The source detection distance of at least one scanning segment among the n scanning segments is gradually reduced in the scanning process.
  16. 16. The system of claim 6 or 15, wherein the relative motion trajectory between the source and the detector in at least one of the n scan segments is perpendicular to the corresponding straight line trajectory of that scan segment.
  17. 17. The system of claim 16, wherein the radiation source in at least one of the n scan segments is movable in a direction perpendicular to the corresponding linear trajectory of the scan segment.
  18. 18. The system of any one of claims 1-17, wherein the n scan segments comprise a first scan segment and a second scan segment, the source detection distance of the first scan segment being greater than the source detection distance of the second scan segment; the beam-out voltage of at least one radiation source in the first scanning segment is greater than the beam-out voltage of at least one radiation source in the second scanning segment, and/or the beam-out current of at least one radiation source in the first scanning segment is greater than the beam-out current of at least one radiation source in the second scanning segment.
  19. 19. The system according to any one of claims 1-18, wherein the transfer means comprises rotation means for rotating the scan object, and/or, The system further includes an encoder disposed on the conveyor for locating the position of the scan object.
  20. 20. The system of any one of claims 1-19, wherein at least one scan segment comprises a plurality of detectors spaced along a corresponding linear trajectory of the scan segment, each of the detectors comprising a single row of detection units, or At least one scanning segment comprises a plurality of detectors which are arranged at intervals along a corresponding straight line track of the scanning segment, each detector comprises a plurality of rows of detection units, or At least one of the scan segments includes a single detector, which is an area array detector.

Description

Linear CT imaging system and scanning imaging method based on multi-section linear track Technical Field The application relates to the technical field of radiation imaging and nondestructive testing, in particular to a linear CT imaging system and a scanning imaging method based on a plurality of sections of linear tracks. Background For nondestructive detection of industrial products, CT scanning imaging technology is generally adopted to detect defects of the industrial products. However, some industrial products have the characteristics of larger size and tissue structure anisotropy, X rays are difficult to penetrate in certain directions, in addition, the process of detecting defects of the industrial products requires a pipeline mode, the geometric position of a traditional slip ring CT scanning imaging system is fixed, and the detection requirement of the industrial products cannot be met. It should be noted that the above information disclosed in this section is only for understanding the background of the inventive concept and thus, the above information may include information that does not constitute prior art. Disclosure of Invention In view of at least one aspect of the above technical problems, embodiments of the present application provide a linear CT imaging system and a scanning imaging method based on a multi-segment linear trajectory. According to a first aspect of the present application, there is provided a linear CT imaging system based on a multi-segment linear trajectory, comprising a conveying device for moving a scanning object along a predetermined m-segment linear trajectory, wherein m is a positive integer greater than or equal to 2, and n scanning segments, each of which includes at least one radiation source and at least one detector, wherein n is a positive integer greater than or equal to 2, and wherein, on both sides of each segment of the linear trajectory, the radiation source and the detector are respectively arranged, the radiation source is used for emitting a radiation beam, the detector is used for detecting the radiation beam emitted by the radiation source and passing through the scanning object, and the scanning fan angle of at least one scanning segment is unequal to the scanning fan angles of other scanning segments in the n scanning segments. According to an embodiment of the application, the scan fan angle of at least one of the n scan segments is smaller than the scan fan angles of the other scan segments. According to an embodiment of the present application, the source detection distance of at least one scan segment is not equal to the source detection distance of other scan segments among the n scan segments. According to an embodiment of the present application, the source detection distance of at least one scan segment is greater than the source detection distances of other scan segments among the n scan segments. According to an embodiment of the application, the source detection distance of at least one of the n scan segments remains unchanged during the scan. According to an embodiment of the application, the source detection distance of at least one of the n scan segments is varied during the scan. According to an embodiment of the application, the n scan segments each comprise at least one source and at least one detector, each independently. According to an embodiment of the application, at least two of the n scan segments share at least one radiation source, share at least one detector, or share at least one radiation source and at least one detector. According to an embodiment of the application, at least two of the m straight-line trajectories are substantially parallel. According to the embodiment of the application, the included angle between at least two sections of straight-line tracks is 180 degrees, and the positions of the at least two sections of straight-line tracks are coincident. According to the embodiment of the application, at least two scanning segments corresponding to at least two straight-line tracks share at least one ray source, the motion track of the at least one shared ray source is perpendicular to the at least two straight-line tracks, or at least two scanning segments corresponding to the at least two straight-line tracks share at least one detector, the motion track of the at least one shared detector is perpendicular to the at least two straight-line tracks, or at least two scanning segments corresponding to the at least two straight-line tracks share the at least one ray source and the at least one detector, and the relative motion track between the at least one shared ray source and the at least one detector is perpendicular to the at least two straight-line tracks. According to an embodiment of the present application, at least two straight-line trajectories intersect among the m straight-line trajectories. According to the embodiment of the application, the included angle between at least two sections of straight