CN-121987228-A - Coordinate calibration device and method based on distributed ray source imaging system

Abstract

The invention provides a coordinate calibration device and a calibration method based on a distributed ray source imaging system, wherein the coordinate calibration device comprises a ray source and a detector, the ray source is suitable for emitting X rays, the detector comprises a detection part and a marking part, the detection part is configured to be placed in a target area and is respectively arranged at two sides of a target to be tested with the ray source and is suitable for receiving the X rays, the marking part is positioned between the detection part and the ray source, the relative positions of the marking part and the detection part are fixed, at least two marking points are arranged on the marking part at intervals, the at least two marking points are suitable for carrying out coordinate calibration on X ray imaging, and the coordinate calibration and the X ray imaging adopt the same group of data. The relative coordinates of the source probe are corrected by using the known parameters on the marking part, the relative coordinates of the source probe are calculated in an auxiliary mode by virtue of the mechanical positioning advantages of the system, the calculated amount of coordinate estimation is reduced, the relative position accuracy can be improved or the real-time position calibration can be realized, the secondary shooting is avoided, and the convenient three-dimensional imaging is realized.

Inventors

• JIN XIN
• TANG HUAPING
• PAN JINSONG
• XIE DEHUA
• FANG RUNZE

Assignees

• 新鸿电子有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (20)

1. 1. A coordinate calibration device based on a distributed radiation source imaging system, comprising: a radiation source adapted to emit X-rays; a detector, comprising: a detection part configured to be disposed on both sides of an object to be measured with the radiation source, respectively, the detection part being adapted to receive the X-rays to image the object to be measured; The first marking part is positioned between the detection part and the ray source and comprises an interested region and a non-interested region arranged outside the interested region, wherein the image of the object to be detected after exposure is positioned in the interested region, a plurality of first marking points with solid geometric shapes are arranged on the first marking part, and the image of the first marking point after exposure is positioned in the first marking part to carry out coordinate calibration on X-ray imaging; the coordinate calibration comprises calculating the relative position relation between the detection part and the ray source by utilizing the shapes of the plurality of first mark points and the imaging shapes of the plurality of first mark points, and the coordinate calibration and the X-ray scanning of an object and the three-dimensional imaging adopt the same group of data.
2. 2. The coordinate calibration device according to claim 1, wherein each of the first marker points includes a marker symbol or a marker pattern, different ones of the marker symbols or the marker patterns having a predetermined relative positional relationship therebetween.
3. 3. The coordinate calibration device according to claim 1, wherein the exposed image of at least one of the first marker points is located in the non-region of interest for coordinate calibration of X-ray imaging and/or, And the image after exposure of at least one first mark point is positioned in the region of interest so as to coordinate and calibrate X-ray imaging.
4. 4. The coordinate calibration device of claim 1, wherein the first marker point is a dot, a line, a bar, an L-shaped column, or an S-shaped column.
5. 5. The coordinate calibration device of claim 1, wherein the number of first marker points is less than or equal to four.
6. 6. The coordinate calibration device according to claim 1, wherein the first marker point is embedded in a side of a top of the first marker portion remote from the detection portion.
7. 7. The coordinate calibration device according to claim 6, wherein the detection portion and the first marking portion are located on the same side of the object to be measured, and the object to be measured, the first marking portion, and the detection portion are sequentially attached to each other.
8. 8. The coordinate calibration device of claim 7, wherein the coordinate calibration device further comprises: and one end of the first bracket is connected with the detection part, and the other end of the first bracket is connected with the ray source, wherein the first bracket is of a rigid structure so as to keep the relative positions of the detection part and the ray source unchanged.
9. 9. The coordinate calibration device of claim 1, wherein the coordinate calibration device further comprises: And one end of the second bracket is connected with the detection part, the other end of the second bracket is connected with the first marking part, the detection part and the first marking part are respectively positioned at two sides of a target to be detected, and the second bracket is of a rigid structure so as to keep the relative positions of the detection part and the first marking part unchanged.
10. 10. The coordinate system of claim 9, wherein the other end of the second support extends away from the detection portion and is connected to the radiation source, the second support being adapted to maintain the relative positions of the radiation source, the detection portion and the first marker portion unchanged.
11. 11. The coordinate calibration device according to claim 1, wherein the first marking portion and the probe portion are located on both sides of the object to be measured, respectively, the coordinate calibration device further comprising: And one end of the third bracket is connected with the first marking part, the other end of the third bracket is connected with the ray source, and the third bracket is of a rigid structure so as to keep the relative positions of the first marking part and the ray source unchanged.
12. 12. The coordinate calibration device of claim 11, wherein the coordinate calibration device further comprises: The second marking part is positioned between the detection part and the target to be detected, two opposite sides of the second marking part are respectively attached to the target to be detected and the detection part, and a second marking point is embedded at one side of the top of the second marking part, which is far away from the detection part.
13. 13. The coordinate calibration device of claim 11, wherein the coordinate calibration device further comprises: the second marking part and the detection part are respectively positioned at two sides of the target to be detected, and a second marking point is embedded at one side of the top of the second marking part far away from the detection part; and one end of the fourth bracket is connected with the detection part, and the other end of the fourth bracket is connected with the second marking part, wherein the fourth bracket is of a rigid structure so as to keep the relative positions of the detection part and the second marking part unchanged.
14. 14. The coordinate calibration device of claim 1, wherein the thickness range of the first marker and the second marker comprises 1-3mm or 2-15mm.
15. 15. The coordinate calibration device of claim 1, wherein the radiation source is a distributed multi-point source array.
16. 16. The coordinate calibration device according to claim 1, wherein both ends of the first bracket are respectively connected with the detection part and the ray source by magnetic attraction, and/or The two ends of the second bracket are respectively connected with the detection part and the first marking part in a magnetic attraction way and/or The two ends of the third bracket are respectively connected with the first marking part and the ray source in a magnetic attraction mode and/or And two ends of the fourth bracket are respectively connected with the detection part and the second marking part in a magnetic attraction mode.
17. 17. The coordinate calibration device of claim 1, wherein the relative positional relationship of the detector and the radiation source includes a flip angle and an offset angle of the detector relative to the radiation source, and a spacing between the detector and the radiation source.
18. 18. The coordinate calibration device of claim 1, wherein the object to be measured is a tooth, a torso, or a whole body of a human body.
19. 19. An imaging system, comprising: a coordinate calibration device according to any one of claims 1 to 18; a data conversion device adapted to convert the detection signal generated by the detection part of the coordinate calibration device into digital data, and And the image processing device is suitable for imaging according to the digital data.
20. 20. A coordinate calibration method based on a distributed radiation source imaging system, which is suitable for the coordinate calibration device of any one of the above claims 1-18, and comprises the following steps: S01, determining the relative position of at least one of the detection part and the ray source and the first marking part; S02, fixing the detection part in a target area, and enabling the detection part and the ray source to be respectively positioned at two sides of a target to be detected; S03, guiding the rays emitted by the ray source to the detection part, and S04, carrying out coordinate calibration on image data acquired by the detection part according to relative position data of at least one of the detection part and the ray source and a first mark point on the first mark part; the first mark point has a solid geometry, and the space coordinates of the ray source and the detection part are calculated by using the shape of the first mark point and the imaging coordinates of the first mark point so as to obtain the relative position relationship between the ray source and the detection part.

Description

Coordinate calibration device and method based on distributed ray source imaging system Technical Field The disclosure relates to the field of medical clinical diagnosis, in particular to a coordinate calibration device, a calibration method and an imaging system based on a distributed ray source imaging system. Background Digital tomosynthesis (digital tomosynthesis, DT) is one of the X-ray imaging modes, and is characterized in that only a small amount of angle projection is needed to obtain a tomographic image parallel to the direction of the detector, and depth information inside the object can be obtained. The traditional digital radiography (digital radiography, DR) acquires superimposed images of the structure of the object, when the focus is overlaid and covered, misdiagnosis is easy to cause, the DT can acquire depth information inside the object, the success rate of diagnosis is improved, and compared with the traditional CT, the DT has the advantages of low radiation dose, high resolution and the like. In the DT system, the accuracy of the relative geometrical coordinates of the light source and the detector has a significant influence on the quality of the reconstructed image. Common geometric calibration methods include visible light calibration, die body calibration, and triangular calibration, wherein the visible light calibration derives the relative coordinates of the detector and the ray source according to the structured light principle, the die body geometric calibration is to invert the relative coordinates of the source probe according to the characteristics of specific calibration materials on the die body on a projection chart, and the triangular calibration method is to calculate the relative relationship of the source probe by combining a device capable of receiving and transmitting signals (a radio frequency transceiver, an electromagnetic coil and the like) with a corresponding induction signal device. The existing die body calibration methods are all coordinate calibration methods based on a mobile single-point source system, the space relative coordinates of source probes are required to be calculated aiming at each point of a light source, the calculated amount of the coordinates is large, and the efficiency is low. Disclosure of Invention In order to solve the technical problems, the disclosed embodiments provide a coordinate calibration device, a calibration method and an imaging system based on a distributed ray source imaging system, which can improve relative position accuracy or realize real-time position calibration, avoid secondary shooting and realize more convenient three-dimensional imaging. According to an inventive concept of one aspect of the present disclosure, there is provided a coordinate calibration device based on a distributed radiation source imaging system, including: a radiation source adapted to emit X-rays; a detector, comprising: a detection part configured to be disposed on both sides of an object to be measured with the radiation source, respectively, the detection part being adapted to receive the X-rays to image the object to be measured; The first marking part is positioned between the detection part and the ray source and comprises an interested region and a non-interested region arranged outside the interested region, wherein the image of the object to be detected after exposure is positioned in the interested region, a plurality of first marking points with solid geometric shapes are arranged on the first marking part, and the image of the first marking point after exposure is positioned in the first marking part to carry out coordinate calibration on X-ray imaging; the coordinate calibration comprises calculating the relative position relation between the detection part and the ray source by utilizing the shapes of the plurality of first mark points and the imaging shapes of the plurality of first mark points, and the coordinate calibration and the X-ray scanning of an object and the three-dimensional imaging adopt the same group of data. According to some embodiments of the disclosure, each of the first marker points includes a marker symbol or a marker pattern, and different marker symbols or marker patterns have a predetermined relative positional relationship therebetween. According to some embodiments of the present disclosure, at least one of the first marker point exposed images is located in the non-region of interest for coordinate calibration of the X-ray imaging and/or at least one of the first marker point exposed images is located in the region of interest for coordinate calibration of the X-ray imaging. According to some embodiments of the disclosure, the first marker point is a dot, a line, a bar, an L-shaped pillar, or an S-shaped pillar. According to some embodiments of the disclosure, the number of first marker points is less than or equal to four. According to some embodiments of the disclosure, the first marking point is