CN115753852A

CN115753852A - Double-ring detection type static CT imaging system

Info

Publication number: CN115753852A
Application number: CN202211626887.6A
Authority: CN
Inventors: 谷胜栋; 蔡星星; 孟磊
Original assignee: Corona Medical Devices Shanghai Co ltd
Current assignee: Corona Medical Devices Shanghai Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-03-07

Abstract

The invention provides a double-ring detection type static CT imaging system, which comprises: a control system; the rack is arranged on the ground; the X-ray scanning system comprises a single X-ray ring, a scanning sequence controller and a scanning controller, wherein the single X-ray ring is arranged on a rack and is in communication connection with the scanning sequence controller, and the X-ray ring comprises a plurality of X-ray sources in a circumferential array; the two detection rings are arranged on the rack and are in communication connection with the scanning time sequence controller, the two detection rings are coaxially arranged on two opposite sides of the X-ray ring, and each detection ring comprises a plurality of detectors in a circumferential array; the X-ray source emits two narrow-beam X-rays simultaneously in a preset time period under the control of the scanning time sequence controller. The invention can optimize the layout space between the X-ray source and the detector, prolong the service life of the X-ray source, enlarge the scanning visual field of the static CT and improve the scanning efficiency of the static CT.

Description

Double-ring detection type static CT imaging system

Technical Field

The invention relates to the technical field of static CT, in particular to a double-ring detection type static CT imaging system.

Background

The conventional CT comprises a gantry, a high voltage generator, a bulb tube and a detector, wherein the gantry is a rotating system, three main elements of the high voltage generator, the bulb tube and the detector are mounted on the gantry to rotate, electric energy is generally transmitted to the rotating gantry through a slip ring, and power supply of moving elements of the gantry transmits electric energy through the slip ring. The rotation of the frame will bring huge acceleration, all components mounted on the frame will bear huge centrifugal force, which will cause great manufacturing difficulty for these components and will affect the life of the components. CT to improve its performance, including time resolution and dose, the gantry rotation speed is faster and faster, which has become a bottleneck limiting the development of CT, and it is difficult to improve the CT further. To break through the current bottleneck, the next generation of revolutionary CT is recognized as static CT.

Static CT was defined as the sixth generation CT over the development history of CT. A brand new imaging means is adopted, the method is an innovative slip-ring-free multi-source CT, and can obtain the imaging characteristics of over speed and ultra-low radiation dose and ultra-high definition images and guide the CT to enter a mesoscopic imaging stage.

The static CT core component comprises a detector ring and a ray source ring, wherein an annular detector arranged on the detector ring consists of a plurality of photon flow detectors. The ray source ring is composed of a distributed X-ray tube or an array type integrated ray source.

In structural design, a slip ring is not used in static CT, and a double-ring mechanical geometry structure is formed by a detector ring and a ray source ring. Dozens to hundreds of ray source focuses are arranged on the ray source ring, and the whole ring of detectors are arranged on the detector ring, so that X-rays emitted by each ray source focus can be imaged by the opposite detectors. The distributed X-ray source focuses of the ray source rings emit X-rays in turn under the exposure control time sequence and the corresponding detector rings collect images, so that the effect similar to the ray source rotating projection of spiral CT equipment is generated, and the time resolution of the CT equipment does not depend on the mechanical rotating speed any more.

However, due to the static nature of static CT, the best and most space-saving way is to spread the detectors over a ring, which can be a challenge for the placement of the static CT detectors and X-ray sources: because a full circle of the X-ray tube needs to be installed, the installation space of the detector is interfered; further, when a full circle detector is constructed simultaneously opposite to the X-ray tube, the installation space of other components is also occupied, resulting in a spatial layout problem. In addition, the scanning range of the existing static CT for the patient is small.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present invention provides a dual-ring detection type static CT imaging system, which can optimize a layout space between an X-ray source and a detector, prolong a service life of the X-ray source, expand a scanning field of static CT, and improve a scanning efficiency of static CT.

In order to solve the above technical problem, the present invention provides a dual ring detection type static CT imaging system, comprising:

the control system comprises a CT host and a scanning time sequence controller which is in communication connection with the CT host;

the rack is arranged on the ground;

the X-ray scanning system comprises a single X-ray ring, a scanning sequence controller and a scanning controller, wherein the single X-ray ring is arranged on a rack and is in communication connection with the scanning sequence controller, and the X-ray ring comprises a plurality of X-ray sources in a circumferential array;

the two detection rings are arranged on the rack and are in communication connection with the scanning time sequence controller, the two detection rings are coaxially arranged on two opposite sides of the X-ray ring, and each detection ring comprises a plurality of detectors in a circumferential array;

the X-ray source emits two narrow-beam X-rays at the same time in a preset time period under the control of the scanning time sequence controller, one narrow-beam X-ray penetrates through a measured object and then is irradiated onto a corresponding detector of one detection ring, the other narrow-beam X-ray penetrates through the measured object and then is irradiated onto a corresponding detector of the other detection ring, and the two detection rings feed exposure information acquired by the corresponding detectors back to the CT host computer to form a CT image of the measured object in the CT host computer.

Preferably, the X-ray source comprises a vacuum tube, and a cathode end for emitting an electron beam, an anode target bombarded by the electron beam and a deflection structure for controlling the motion track of the electron beam are arranged in the vacuum tube.

Preferably, the X-ray source further comprises a temperature sensor, the temperature sensor is arranged on one side of the anode target, which is opposite to the cathode end, and is in communication connection with the CT host.

Preferably, the cathode end and the anode target are arranged in an aligned manner along a direction parallel to the axis of the X-ray ring, a window is arranged on the pipe wall of the vacuum pipe facing inwards in the radial direction, the window is aligned with the anode target along the radial direction of the X-ray ring, and the anode target is of a thick target structure so as to emit X rays generated by electron beam bombardment to the window from the bombardment surface of the electron beam.

Preferably, the vacuum tube extends in an arc shape by taking an axis of the X-ray ring as a circle center, the number of the cathode ends and the number of the anode targets are both multiple and in one-to-one correspondence, all the cathode ends are sequentially arranged along the extending direction of the vacuum tube, and all the anode targets are sequentially arranged along the extending direction of the vacuum tube.

Preferably, the side of the anode target bombarded by the electron beam is a wedge-shaped surface.

Preferably, the dual ring detection type static CT imaging system further comprises a collimating ring including a coaxial inner sleeve to the X-ray ring to split the X-rays emitted by the X-ray source into two passes.

Preferably, the collimating ring comprises a torus and a plurality of collimating hole structures radially penetrating through the torus, and each collimating hole structure comprises two arc-shaped slots arranged side by side.

Preferably, the double-ring detection type static CT imaging system further includes a bed frame for supporting the object to be measured, the control system further includes a driving controller for controlling the bed frame to move, and the driving controller is communicatively connected to the CT host.

Preferably, the detection ring is in a conical ring structure, and a large-diameter port of the detection ring faces the X-ray ring.

As described above, the dual ring detection type static CT imaging system of the present invention has the following advantages: the control system comprises a CT host and a scanning time sequence controller which is in communication connection with the CT host, the CT host is provided with a human-computer interaction system and an image forming system, and a scanning mode program in the scanning time sequence controller can be input or modified by the CT host. The frame is arranged on the ground and is a main bearing and mounting structure of the double-ring detection type static CT imaging system. The double-ring detection type static CT imaging system has the main innovation points that: the X-ray ring is arranged on the rack and is in communication connection with the scanning time sequence controller, and the X-ray ring comprises a plurality of X-ray sources in a circumferential array; the X-ray detector comprises a rack, two detection rings, a scanning time sequence controller and a plurality of X-ray detection rings, wherein the two detection rings are arranged on the rack and are in communication connection with the scanning time sequence controller; so set up, above-mentioned X-ray source launches two lane narrow beam X ray simultaneously at the preset period of time under the control of scanning time schedule controller, and on one of them narrow beam X ray shines the corresponding detector of a detecting ring after permeating the testee, another lane narrow beam X ray shines the corresponding detector of another detecting ring after permeating the testee, and two detect the ring with the exposure information feedback that the corresponding detector gathered to CT host computer in order to form the CT image of testee in the CT host computer. That is to say, in order to realize better spatial layout of the static CT, the two narrow beam X-rays emitted by the X-ray source are respectively obliquely irradiated onto the corresponding detectors of the two detection rings, so that the X-ray rings can be avoided, and the service life of the X-ray source is prolonged. By using the layout mode, more CT images can be obtained in a limited space under the condition that an X-ray source and a detector are not interfered with each other, and the scanning efficiency of static CT is improved. Therefore, the double-ring detection type static CT imaging system can optimize the layout space between the X-ray source and the detector, prolong the service life of the X-ray source, expand the scanning visual field of the static CT and improve the scanning efficiency of the static CT.

Drawings

FIG. 1 is a perspective view of a dual ring probe type static CT imaging system in accordance with the present invention;

FIG. 2 is a front view of the dual ring probe type static CT imaging system of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 3;

FIG. 5 shows a schematic view of a first embodiment of an X-ray source;

figure 6 shows a schematic view of a second embodiment of the X-ray source;

FIG. 7 is a schematic diagram of a dual ring detection type static CT imaging system.

Description of the element reference numerals

1. Control system

11 CT host

12. Scanning time sequence controller

13. Drive controller

2. Rack

3X ray ring

31 X-ray source

311. Vacuum tube

312. Cathode terminal

313. Anode target

313a wedge-face

314. Temperature sensor

315. Window opening

316. Grid electrode

4. Detection ring

41. Detector

5. Collimating ring

51. Ring body

52. Arc-shaped long and narrow hole

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

The invention provides a double-ring detection type static CT imaging system, the basic imaging principle of which is as follows: the X-ray beam and the X-ray detector with extremely high sensitivity are utilized to carry out section scanning on a certain part of a human body layer by layer, the X-ray which penetrates through the layer is received by the scintillating material on the X-ray detector, converted into visible light, converted into an electric signal by the photoelectric converter, amplified, converted into a digital signal by analog/digital conversion processing, and input into a computer for processing. In the computer, the selected slice is divided into several cubes of the same volume, called voxels (Voxel). The information obtained by the layer-by-layer section scanning is calculated to obtain the X-ray attenuation coefficient or absorption coefficient of each voxel, and then the X-ray attenuation coefficient or absorption coefficient is arranged into a matrix, namely a voxel digital matrix. The digital information in the voxel digital matrix is converted into small blocks with different gray scales from black to white, which are called pixels (pixels) on a two-dimensional projection and are arranged in a fault mode to form a CT image.

Based on this, as shown in fig. 1 and fig. 2 and fig. 7, in order to solve the spatial layout problem of the static CT and meet the practical requirement of large field of view, the present invention provides a dual ring detection type static CT imaging system, which includes:

the control system 1 comprises a CT host 11 and a scanning time sequence controller 12 which is in communication connection with the CT host 11;

a frame 2 arranged on the ground;

a single X-ray ring 3,X, a ray ring 3 is arranged on the frame 2 and is in communication connection with the scanning timing controller 12, the X-ray ring 3 comprises a plurality of X-ray sources 31 in a circumferential array;

two detection rings 4, wherein the two detection rings 4 are both arranged on the rack 2 and are both in communication connection with the scanning timing controller 12, the two detection rings 4 are coaxially arranged on two opposite sides of the X-ray ring 3, and each detection ring 4 comprises a plurality of detectors 41 in a circumferential array;

the X-ray source 31 emits two narrow-beam X-rays simultaneously at a preset time interval under the control of the scanning timing controller 12, one of the narrow-beam X-rays irradiates the corresponding detector 41 of one detection ring 4 after penetrating through the object to be measured, the other narrow-beam X-ray irradiates the corresponding detector 41 of the other detection ring 4 after penetrating through the object to be measured, and the two detection rings 4 feed back exposure information acquired by the corresponding detectors 41 to the CT host 11 to form a CT image of the object to be measured in the CT host 11.

In the present invention, the control system 1 includes a CT host 11 and a scan timing controller 12 communicatively connected to the CT host 11, the CT host 11 has a man-machine interaction system and an image forming system, and a scan mode program in the scan timing controller 12 can be input or modified by the CT host 11. The frame 2 is arranged on the ground, and the frame 2 is a main bearing and mounting structure of the double-ring detection type static CT imaging system. The double-ring detection type static CT imaging system has the main innovation points that: the number of the X-ray rings 3 is single, the X-ray rings 3 are arranged on the frame 2 and are in communication connection with the scanning timing controller 12, and the X-ray rings 3 comprise a plurality of X-ray sources 31 in a circumferential array; the number of the detection rings 4 is two, the two detection rings 4 are arranged on the rack 2 and are in communication connection with the scanning timing controller 12, the two detection rings 4 are coaxially arranged on two opposite sides of the X-ray ring 3, and each detection ring 4 comprises a plurality of detectors 41 in a circumferential array; so set up, above-mentioned X-ray source 31 launches two narrow beam X-rays simultaneously at the predetermined period of time under the control of scanning timing controller 12, and one of them narrow beam X-ray shines on the corresponding detector 41 of a detecting ring 4 after permeating the testee, and another narrow beam X-ray shines on the corresponding detector 41 of another detecting ring 4 after permeating the testee, and two detect ring 4 feed back the exposure information that corresponds detector 41 and gather to CT host computer 11 with the CT image that forms the testee in CT host computer 11. That is to say, in order to realize better spatial layout of the static CT, the two narrow beams of X-rays emitted by the X-ray source 31 are respectively obliquely irradiated (the target disk flying focus technology of the X-ray source 31 can be adopted) onto the corresponding detectors 41 of the two detection rings 4, so as to avoid the X-ray ring 3 and improve the service life of the X-ray source 31. By using the layout mode, more CT images can be obtained in a limited space under the condition that the X-ray source 31 and the detector 41 are not interfered with each other, and the scanning efficiency of static CT is improved.

Therefore, the double-ring detection type static CT imaging system can optimize the layout space between the X-ray source 31 and the detector 41, prolong the service life of the X-ray source 31, expand the scanning visual field of the static CT and improve the scanning efficiency of the static CT.

As shown in fig. 3 and 4, in order to implement the flying focus technique of the X-ray source 31, the X-ray source 31 includes a vacuum tube 311, and a cathode end 312 for emitting an electron beam, an anode target 313 bombarded by the electron beam, and a deflection structure for controlling a motion trajectory of the electron beam are disposed in the vacuum tube 311. The deflecting structure may be an electromagnetic coil.

As shown in fig. 6, in addition, as an embodiment of the X-ray source 31, the X-ray source 31 further includes a grid 316, and the grid 316 can be used to control a dynamic motion trajectory of the electron beam to directly change an oblique irradiation angle. The grid 316 can simultaneously realize a plurality of functions, one is to change the focal position and realize the adjustment function of the oblique irradiation angle, and the other is to control the intensity of the electron beam and realize the function of dynamic control of the current, so that the local temperature of the anode target 313 can be reduced and the service life of the anode target 313 can be prolonged. In addition, the X-ray source 31 also requires a high voltage generator to drive.

As shown in fig. 4, in order to detect the temperature of the anode target 313, the X-ray source 31 further includes a temperature sensor 314, and the temperature sensor 314 is disposed on a side of the anode target 313 opposite to the cathode end 312 and is communicatively connected to the CT host 11.

As shown in FIGS. 4 and 5, in order to reduce the outer diameter of the X-ray ring 3, the cathode end 312 and the anode target 313 are aligned in a direction parallel to the axis of the X-ray ring 3, a window 315 is provided on the radially inward wall of the vacuum tube 311, the window 315 is aligned with the anode target 313 along the radial direction of the X-ray ring 3, and the anode target 313 is a thick target structure to direct the X-rays generated by electron beam bombardment from the bombardment surface of the electron beam to the window 315.

Furthermore, in order to improve the compactness of the X-ray source 31, the vacuum tube 311 extends in an arc shape with the axis of the X-ray ring 3 as the center, the number of the cathode ends 312 and the number of the anode targets 313 are both multiple and in one-to-one correspondence, all the cathode ends 312 are sequentially arranged along the extending direction of the vacuum tube 311, and all the anode targets 313 are sequentially arranged along the extending direction of the vacuum tube 311.

As shown in fig. 4, since the anode target 313 has a thick target structure, the side surface of the anode target 313 bombarded by the electron beam is a wedge surface in order to emit the X-ray from the bombarding surface of the electron beam to the window 315.

As shown in fig. 1 and 4, in order to precisely irradiate the narrow beam X-rays emitted from the X-ray source 31 to the corresponding detectors 41 of the two detection rings 4 obliquely, the dual ring detection type static CT imaging system further includes a collimating ring 5, and the collimating ring 5 includes a coaxial inner sleeve to the X-ray ring 3 to split the X-rays emitted from the X-ray source 31 into two paths.

Further, in order to simplify the structure of the collimating ring 5, the collimating ring 5 includes a circular ring body 51 and a plurality of collimating hole structures radially penetrating through the circular ring body 51, each collimating hole structure includes two arc-shaped slots 52 arranged side by side, one of the arc-shaped slots 52 is used for guiding the X-rays to one of the detecting rings 4, and the other arc-shaped slot 52 is used for guiding the X-rays to the other detecting ring 4.

In order to control the object to be measured to move into the X-ray ring 3, the dual ring detection type static CT imaging system further includes a bed frame for supporting the object to be measured (e.g., a human body), the control system further includes a driving controller 13 for controlling the movement of the bed frame, and the driving controller 13 is communicatively connected to the CT host 11.

As shown in fig. 3, in order to facilitate the detection ring 4 to receive X-rays, the detection ring 4 has a conical ring structure, and a large-diameter port of the detection ring 4 faces the X-ray ring 3.

In summary, the double-ring detection type static CT imaging system of the present invention can optimize the layout space between the X-ray source and the detector, improve the service life of the X-ray source, expand the scanning field of the static CT, and improve the scanning efficiency of the static CT. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A dual ring probe-type static CT imaging system, comprising:

the control system (1), the control system (1) includes CT host computer (11) and scanning time schedule controller (12) that the communication links to CT host computer (11);

a frame (2) arranged on the ground;

the X-ray scanning system comprises a single X-ray ring (3), wherein the X-ray ring (3) is arranged on a rack (2) and is in communication connection with a scanning time sequence controller (12), and the X-ray ring (3) comprises a plurality of X-ray sources (31) in a circumferential array;

the X-ray detector comprises two detection rings (4), wherein the two detection rings (4) are arranged on a rack (2) and are in communication connection with a scanning time sequence controller (12), the two detection rings (4) are coaxially arranged on two opposite sides of an X-ray ring (3), and each detection ring (4) comprises a plurality of detectors (41) in a circumferential array;

the X-ray source (31) emits two narrow-beam X-rays at the same time in a preset time period under the control of the scanning time sequence controller (12), wherein one narrow-beam X-ray penetrates through a measured object and then is projected onto a corresponding detector (41) of one detection ring (4), the other narrow-beam X-ray penetrates through the measured object and then is projected onto a corresponding detector (41) of the other detection ring (4), and the two detection rings (4) feed exposure information acquired by the corresponding detectors (41) back to the CT host (11) so as to form a CT image of the measured object in the CT host (11).

2. The dual ring detection type static CT imaging system of claim 1, wherein: the X-ray source (31) comprises a vacuum tube (311), wherein a cathode end (312) for emitting an electron beam, an anode target (313) bombarded by the electron beam and a deflection structure for controlling the motion track of the electron beam are arranged in the vacuum tube (311).

3. The dual ring detection type static CT imaging system of claim 2, wherein: the X-ray source (31) further comprises a temperature sensor (314), wherein the temperature sensor (314) is arranged on one side, facing away from the cathode end (312), of the anode target (313) and is in communication connection with the CT host (11).

4. The dual ring detection type static CT imaging system of claim 2, wherein: the cathode end (312) and the anode target (313) are arranged in an aligned mode along the direction parallel to the axis of the X-ray ring (3), a window (315) is formed in the pipe wall, facing inwards in the radial direction, of the vacuum pipe (311), the window (315) is aligned to the anode target (313) along the radial direction of the X-ray ring (3), and the anode target (313) is of a thick target structure and is used for enabling X rays generated by electron beam bombardment to be emitted to the window (315) from the bombardment surface of the electron beam.

5. The dual ring detection type static CT imaging system of claim 4, wherein: the vacuum tube (311) extends in an arc mode by taking the axis of the X-ray ring (3) as a circle center line, the number of the cathode ends (312) and the number of the anode targets (313) are multiple and are in one-to-one correspondence, all the cathode ends (312) are sequentially arranged along the extending direction of the vacuum tube (311), and all the anode targets (313) are sequentially arranged along the extending direction of the vacuum tube (311).

6. The dual ring detection type static CT imaging system of claim 4, wherein: the side surface of the anode target (313) bombarded by the electron beam is a wedge-shaped surface (313 a).

7. The dual ring detection type static CT imaging system of claim 1, wherein: the double-ring detection type static CT imaging system further comprises a collimation ring (5), wherein the collimation ring (5) is coaxially sleeved in the X-ray ring (3) to divide X-rays emitted by the X-ray source (31) into two paths.

8. The dual ring detection type static CT imaging system of claim 7, wherein: the collimating ring (5) comprises a ring body (51) and a plurality of collimating hole structures which radially penetrate through the ring body (51), and each collimating hole structure comprises two arc-shaped long and narrow holes (52) which are arranged side by side.

9. The dual ring detection type static CT imaging system of claim 1, wherein: the double-ring detection type static CT imaging system further comprises a bed frame for supporting a detected object, the control system further comprises a driving controller (13) for controlling the bed frame to move, and the driving controller (13) is in communication connection with the CT host (11).

10. The dual ring detection type static CT imaging system of claim 1, wherein: the detection ring (4) is in a conical ring structure, and a large-diameter port of the detection ring (4) faces the X-ray ring (3).