CN219626586U - Cathode unitized X-ray emission device and static CT imaging system - Google Patents

Abstract

The utility model provides a cathode unitized X-ray emission device and a static CT imaging system, comprising: a vacuum tube; the cathode end for emitting the electron beams comprises an exposure electronic control module and a plurality of electron emission units which are arranged on the same side of the exposure electronic control module in a matrix manner, and all the electron emission units are mutually independent and respectively and electrically connected with the exposure electronic control module; an anode target bombarded by the electron beam, the anode target comprising an anode main body and a target surface formed on the anode main body, the target surface being positioned on an emission path of the electron emission unit; when receiving external control signals, the exposure electronic control module enables a voltage circuit to be established between the selected electron emission units and the exposure electronic control module, the electron emission units emit electrons towards the target surface one by one or row by row, and the target surface reflects X rays to the window under the bombardment of the electrons. The utility model can increase the scanning range, improve the image quality of static CT and prolong the service life of the X-ray emitting device.

Description

Cathode unitized X-ray emission device and static CT imaging system

Technical Field

The utility model relates to the technical field of static CT, in particular to a cathode unitized X-ray emission device and a static CT imaging system.

Background

The traditional CT is composed of a frame, a high-voltage generator, a bulb and a detector, wherein the frame is a rotating system, three main elements of the high-voltage generator, the bulb and the detector are installed on the frame to rotate, electric energy is generally transmitted to the rotating frame through a slip ring, and power supply of moving elements of the frame is all transmitted to the electric energy through the slip ring. The rotation of the frame brings about huge acceleration, all elements mounted on the frame bear huge centrifugal force, and the components are difficult to manufacture and the service life of the components is influenced. In order to improve the performance of CT, including time resolution and dose, the rotation speed of the gantry is faster and faster, which has become a bottleneck for limiting the development of CT, and is difficult to further improve. In order to break through the current bottleneck, the next generation revolutionary CT is acknowledged to be static CT.

Static CT was defined as the sixth generation CT over the history of CT development. The novel imaging means is innovative slip ring-free multi-source CT, can obtain overspeed, ultra-low radiation dose imaging characteristics and ultra-high definition images, and leads CT to enter a mesoscopic imaging stage.

The static CT core component includes a detector ring and a radiation source ring, wherein the detector ring is configured as an annular detector consisting of a plurality of photon flow detectors. The ray source ring is composed of distributed X-ray tubes or array type integrated ray sources.

In structural design, static CT no longer uses the sliding ring, and the detector ring and the ray source ring form a double-ring mechanical geometry. Wherein tens to hundreds of radiation source focuses are arranged on the radiation source ring, and full-ring detectors are arranged on the detector ring, so that X-rays emitted by each radiation source focus can be imaged by the opposite detector. The distributed X-ray source focal spots of the ray source ring alternately emit X-rays and collect images by the corresponding detector ring under the exposure control timing, which essentially produces the effect of a rotational projection of the ray source like a helical CT apparatus, so that the time resolution of the CT apparatus can no longer depend on the speed of the mechanical rotation.

The existing static CT generally adopts a single-layer design, a single-layer emission source and a single-layer detector are relatively simple in structure, but can only image in a very narrow direction, and the defect of small coverage area also exists in the scanning process, so that the scanning of specific organs or samples can be completed by means of a linear motion bed frame.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is to provide a cathode unitized X-ray emitting device and a static CT imaging system, which can selectively perform multipoint exposure in a cathode unitized form, increase the scanning range in combination with the angle of the target surface, improve the image quality of static CT, effectively reduce the local temperature of the anode target, and improve the lifetime of the X-ray emitting device.

In order to solve the above technical problems, the present utility model provides a cathode unitized X-ray emitting device, comprising:

a vacuum tube provided with a window allowing X-rays to penetrate;

the cathode end is arranged in the vacuum tube and comprises an exposure electronic control module and a plurality of electron emission units which are arranged on the same side of the exposure electronic control module in a matrix manner, and all the electron emission units are mutually independent and respectively and electrically connected with the exposure electronic control module;

an anode target bombarded by the electron beam, wherein the anode target is arranged in the vacuum tube and comprises an anode main body and a target surface formed on the anode main body, the target surface is positioned on an emission path of the electron emission unit, and the normal line of the target surface and the emission direction of the electron emission unit are arranged at an acute angle;

when receiving external control signals, the exposure electronic control module enables a voltage circuit to be established between the selected electron emission units and the exposure electronic control module, the electron emission units emit electrons towards the target surface one by one or row by row, and the target surface reflects X rays to the window under the bombardment of the electrons.

Preferably, the electron emission unit includes a unit filament and a unit switching circuit for electrically connecting the unit filament and the exposure electronic control module.

Preferably, the anode body is sector-shaped, the anode body has a wedge-shaped face, and the target surface is molded on the wedge-shaped face.

The present utility model also provides a 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;

a frame arranged on the ground;

an X-ray ring arranged on the frame and communicatively connected to the scanning timing controller, the X-ray ring comprising a plurality of cathode unitized X-ray emitting devices in a circumferential array;

and the detection ring is arranged on the frame and is in communication connection with the scanning time sequence controller, and a single detection ring is coaxially arranged on one side of the X-ray ring and comprises a plurality of detectors in a circumferential array.

Preferably, the vacuum tube extends in a circular arc with the axis of the X-ray ring as a center line.

Preferably, the cathode end and the anode target are aligned in a direction parallel to the axis of the X-ray ring, the window is provided in the radially inward wall of the vacuum tube, and the window is aligned radially to the anode target along the X-ray ring.

Preferably, the number of the cathode ends and the number of the anode targets are multiple and are in one-to-one correspondence, all cathode ends are sequentially arranged along the circumferential direction of the X-ray ring, and all anode targets are sequentially arranged along the circumferential direction of the X-ray ring.

Preferably, the static CT imaging system further comprises a collimator ring comprising an X-ray ring coaxially nested within the X-ray ring to confine X-rays emitted by the cathode-unitized X-ray emitting device.

Preferably, the collimating ring comprises a torus and a collimating hole structure radially penetrating through the torus.

As described above, the cathode unitized X-ray emitting device and the static CT imaging system of the present utility model have the following advantageous effects: the cathode end of the X-ray emission device is not an integral body, but a structure which is separated and arranged in a matrix mode, the cathode end is coupled to the horizontal length direction of the object to be detected through the inclination angle of the target surface of the anode target, a larger scanning range is formed to observe different positions of the object to be detected, and the imaging effect formed by the method is higher than that of the existing static CT. The cathode end is arranged in the vacuum tube and is used for emitting electron beams, the cathode end comprises an exposure electronic control module and a plurality of electron emission units which are arranged on the same side of the exposure electronic control module in a matrix manner, all the electron emission units are mutually independent and are respectively and electrically connected with the exposure electronic control module, the anode target comprises an anode main body and a target surface formed on the anode main body, the target surface is positioned on an emission path of the electron emission units, and the normal line of the target surface and the emission direction of the electron emission units are arranged at an acute angle, so that an X-ray can be generated in a back scattering mode; when the exposure electronic control module receives an external control signal, a voltage circuit is established between the selected electron emission unit and the exposure electronic control module, the electron emission unit emits electrons towards the target surface one by one or line by line, and the target surface reflects X rays to the window under the bombardment of the electrons. The size or position of the focus on the target surface can be freely adjusted, the temperature of the anode target raised by exposure can be reduced, the smoothness of CT images can be controlled, and artifacts can be reduced. Therefore, the cathode unitized X-ray emitting device can selectively perform multipoint exposure through a unitized form of a cathode end, increases the scanning range by combining the angle of a target surface, improves the image quality of static CT, can effectively reduce the local temperature of an anode target, and improves the service life of the X-ray emitting device.

Drawings

FIG. 1 shows a perspective view of a cathode unitized X-ray emitting device of the present utility model;

FIG. 2 shows a partial cross-sectional view of a cathode unitized X-ray emitting device of this utility model;

FIG. 3 shows a first perspective view of the cathode end and anode target;

FIG. 4 shows a second perspective view of the cathode end and anode target;

FIG. 5 shows a perspective view of an X-ray loop;

FIG. 6 shows an internal structural view of an X-ray ring;

FIG. 7 is a schematic diagram of the use of an X-ray loop;

FIG. 8 shows a perspective view of a static CT imaging system of the present utility model;

FIG. 9 shows a front view of a static CT imaging system of the present utility model;

FIG. 10 is a cross-sectional view taken along line A-A of FIG. 9;

fig. 11 is an enlarged view of a portion B in fig. 10.

Description of element reference numerals

1. Control system

11 CT host

12. Scanning time sequence controller

2. Rack

3X ray ring

31. Cathode unitized X-ray emitting device

311. Vacuum tube

312. Cathode terminal

312a exposure electric control module

312b electron emission unit

313. Anode target

313a anode body

313b target surface

314. Temperature sensor

315. Window

4. Detection ring

41. Detector for detecting a target object

5. Collimation ring

51. Round ring body

52. Collimation hole structure

6. Object to be measured

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

As shown in fig. 1, 2, 3, 4 and 7, the present utility model provides a cathode unitized X-ray emitting device comprising:

a vacuum tube 311, wherein a window 315 allowing X-rays to pass through is arranged on the vacuum tube 311;

a cathode end 312 for emitting electron beams, the cathode end 312 being disposed in the vacuum tube 311, the cathode end 312 comprising an exposure electronic control module 312a and a plurality of electron emission units 312b disposed on the same side of the exposure electronic control module 312a in a matrix arrangement, all the electron emission units 312b being independent of each other and electrically connected to the exposure electronic control module 312a;

an anode target 313 bombarded by the electron beam, the anode target 313 being disposed in the vacuum tube 311, the anode target 313 including an anode main body 313a and a target surface 313b formed on the anode main body 313a, the target surface 313b being located on an emission path of the electron emission unit 312b, a normal line of the target surface 313b and an emission direction of the electron emission unit 312b being disposed at an acute angle;

the exposure electronic control module 312a establishes a voltage line between the selected electron emission unit 312b and the exposure electronic control module 312a when receiving an external control signal, and the electron emission unit 312b emits electrons toward the target surface 313b one by one or row by row, and the target surface 313b reflects the X-rays to the window 315 under the bombardment of the electrons.

In the present utility model, the cathode end 312 of the X-ray emitting device is not an integral body but a structure of a separated and matrix arrangement, and is coupled to the horizontal length direction of the object 6 to be measured by the inclination angle of the target surface 313b of the anode target 313, so as to form a larger scanning range to observe different positions of the object 6 (for example, human organs), thus forming an imaging effect higher than that of the existing static CT.

Specifically, referring to fig. 3, the cathode end 312 is disposed in the vacuum tube 311 and is used for emitting an electron beam, the cathode end 312 includes an exposure electronic control module 312a and a plurality of electron emission units 312b disposed on the same side of the exposure electronic control module 312a in a matrix arrangement, all the electron emission units 312b are independent of each other and are electrically connected to the exposure electronic control module 312a, the anode target 313 includes an anode main body 313a and a target surface 313b formed on the anode main body 313a, the target surface 313b is disposed on an emission path of the electron emission units 312b, and a normal line of the target surface 313b and an emission direction of the electron emission units 312b are disposed at an acute angle, so that an X-ray can be generated by using a back scattering manner; so configured, when the exposure electronic control module 312a receives an external control signal, a voltage line is established between the selected electron emission unit 312b and the exposure electronic control module 312a, the electron emission unit 312b emits electrons toward the target surface 313b one by one or row by row, and the target surface 313b reflects the X-rays to the window 315 under the bombardment of the electrons. For example, a plurality of white small arrows shown in fig. 3 indicate a sequence of exposure of the electron emission units 312b belonging to the same row one by one, and if a row includes N electron emission units 312b, exposure is performed N times, and then the next row is exposed again, thus cycling. As another example, a single white large arrow shown in fig. 3 indicates a row-by-row exposure sequence of the electron emission units 312b belonging to different rows, i.e., all the electron emission units 312b belonging to the same row may be simultaneously exposed, if there are M rows, then exposed M times. Fig. 3 shows schematically that a single cathode terminal 312 includes 168 electron emission units 312b arranged in a matrix of 14 (columns) ×12 (rows). By such design, the size or position of the focal point on the target surface 313b can be freely adjusted, the temperature of the anode target 313 raised by exposure can be reduced, the smoothness of the CT image can be controlled, and the artifacts can be reduced.

Therefore, the cathode unitized X-ray emitting device of the present utility model can selectively perform multi-point exposure through the unitized form of the cathode terminal 312, increases the scanning range in combination with the angle of the target surface 313b, improves the image quality of static CT, and can effectively reduce the local temperature of the anode target 313 and improve the life of the X-ray emitting device.

The electron emission unit 312b may be an existing electron emission structure such as a micro-sized electron gun-like structure. For example, the electron emission unit 312b includes a unit filament and a unit switching circuit for electrically connecting the unit filament and the exposure electronic control module 312 a.

As shown in fig. 4, in order to obliquely set the target surface 313b, the anode body 313a has a sector shape, the anode body 313a has a wedge surface, and the target surface 313b is formed on the wedge surface.

As shown in fig. 5, 6, 7, 8, 9, 10 and 11, the present utility model further provides a static CT imaging system, including:

the control system 1, the control system 1 includes a CT host 11 and a scan timing controller 12 communicatively connected to the CT host 11;

a frame 2 arranged on the ground;

an X-ray ring 3 (see fig. 5 and 6 in particular), the X-ray ring 3 being provided to the gantry 2 and being communicatively connected to the scan timing controller 12, the X-ray ring 3 comprising a plurality of the above-mentioned cathode unitized X-ray emitting devices in a circumferential array;

a detection ring 4, the detection ring 4 being provided to the gantry 2 and being communicatively connected to the scanning timing controller 12, a single detection ring 4 being coaxially arranged on one side of the X-ray ring 3, the detection ring 4 comprising a plurality of detectors 41 in a circumferential array.

In the static CT imaging system described above, the scan timing controller 12 may send the external control signals to the exposure electronic control module 312a of each cathode end 312.

As shown in fig. 5, in order to improve the compactness of the X-ray ring 3, the vacuum tube 311 extends in a circular arc with the axis of the X-ray ring 3 as a center line, and the angle corresponding to the vacuum tube 311 is an acute angle.

As an example of the above-described X-ray emitting device 31: the X-ray emitting device 31 further includes a deflection structure for controlling the movement trace of the electron beam; the deflection structure may be a solenoid. As shown in fig. 11, in order to detect the temperature of the anode target 313, the X-ray emitting device 31 further includes a temperature sensor 314, and the temperature sensor 314 is disposed on a side of the anode target 313 facing away from the cathode end 312 and is communicatively connected to the CT host 11.

In order to improve the compactness of the X-ray emitting device 31, the cathode end 312 and the anode target 313 are aligned in a direction parallel to the axis of the X-ray ring 3, and the window 315 is provided on the wall of the vacuum tube 311 radially inward, and the window 315 is aligned with the anode target 313 radially along the X-ray ring 3.

Further, the number of the cathode ends 312 and the number of the anode targets 313 are plural and correspond to each other one by one, all the cathode ends 312 are sequentially arranged along the circumferential direction of the X-ray ring 3, and all the anode targets 313 are sequentially arranged along the circumferential direction of the X-ray ring 3.

The static CT imaging system further comprises a collimator ring 5, wherein the collimator ring 5 comprises an X-ray ring 3 coaxially sleeved in the X-ray ring to restrict X-rays emitted by the cathode unitized X-ray emitting device 31. Further, the collimating ring 5 includes a torus 51 and a collimating hole structure radially penetrating the torus 51.

The utility model also provides an image enhancement method adopting the static CT imaging system, which comprises the following steps:

a preset exposure program of all the electron emission units 312b of the cathode end 312 is set on the CT host 11;

under the control of the exposure electronic control module 312a, all the electron emission units 312b emit free electrons one by one or row by row in an exposure sequence from the radially outer side of the X-ray ring 3 to the radially inner side of the X-ray ring 3 or from the radially inner side of the X-ray ring 3 to the radially outer side of the X-ray ring 3 based on a preset exposure program;

the exposure information collected by all the detectors 41 is fed back to the CT host 11, and a CT image of the object 6 to be measured is formed in the CT host 11.

In the image enhancement method of the utility model, the cathode end 312 is divided, so that the number of exposure points is effectively increased, the use area of the target surface 313b is effectively increased, and the heat of the focus of the target disk is reduced; in addition, the multi-focus exposure mode also effectively changes the irradiation angle of X rays, and similar to the flying focus structure of the existing X-ray emission device, more image sequences can be formed, imaging is carried out from a finer scanning view angle, the formed CT image is smoother, the artifact of the image is removed, and the improvement of the CT image quality is greatly facilitated.

In summary, the cathode unitized X-ray emission device and the static CT imaging system can selectively perform multi-point exposure through the unitized form of the cathode end, increase the scanning range by combining the angle of the target surface, improve the image quality of static CT, effectively reduce the local temperature of the anode target and prolong the service life of the X-ray emission device. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (9)

1. A cathode unitized X-ray emitting device comprising:

a vacuum tube (311), wherein a window (315) allowing X-rays to pass through is arranged on the vacuum tube (311);

a cathode end (312) for emitting electron beams, the cathode end (312) being arranged in the vacuum tube (311), the cathode end (312) comprising an exposure electronic control module (312 a) and a plurality of electron emission units (312 b) arranged in a matrix on the same side of the exposure electronic control module (312 a), all the electron emission units (312 b) being independent of each other and electrically connected to the exposure electronic control module (312 a) respectively;

an anode target (313) bombarded by the electron beam, wherein the anode target (313) is arranged in the vacuum tube (311), the anode target (313) comprises an anode main body (313 a) and a target surface (313 b) formed on the anode main body (313 a), the target surface (313 b) is positioned on an emission path of the electron emission unit (312 b), and a normal line of the target surface (313 b) and an emission direction of the electron emission unit (312 b) are arranged at an acute angle;

the exposure electronic control module (312 a) establishes a voltage circuit between the selected electron emission unit (312 b) and the exposure electronic control module (312 a) when receiving an external control signal, the electron emission unit (312 b) emits electrons towards the target surface (313 b) one by one or row by row, and the target surface (313 b) reflects X-rays to the window (315) under the bombardment of the electrons.

2. The cathode unitized X-ray emitting apparatus of claim 1 wherein: the electron emission unit (312 b) includes a unit filament and a unit switching circuit for electrically connecting the unit filament and the exposure electronic control module (312 a).

3. The cathode unitized X-ray emitting apparatus of claim 1 wherein: the anode body (313 a) is in a sector shape, the anode body (313 a) is provided with a wedge surface, and the target surface (313 b) is molded on the wedge surface.

4. A static CT imaging system, comprising:

the control system (1), the control system (1) includes CT host computer (11), scan time schedule controller (12) connected to CT host computer (11) of communication;

a frame (2) arranged on the ground;

an X-ray ring (3), the X-ray ring (3) being provided to the gantry (2) and being communicatively connected to the scan timing controller (12), the X-ray ring (3) comprising a plurality of cathode unitized X-ray emitting devices according to any one of claims 1 to 3 in a circumferential array;

the detection ring (4) is arranged on the frame (2) and is in communication connection with the scanning time sequence controller (12), the single detection ring (4) is coaxially arranged on one side of the X-ray ring (3), and the detection ring (4) comprises a plurality of detectors (41) in a circumferential array.

5. The static CT imaging system of claim 4, wherein: the vacuum tube (311) extends in an arc shape by taking the axis of the X-ray ring (3) as a center line.

6. The static CT imaging system of claim 4, wherein: the cathode end (312) and the anode target (313) are aligned along a direction parallel to the axis of the X-ray ring (3), the window (315) is arranged on the radially inward pipe wall of the vacuum pipe (311), and the window (315) is aligned with the anode target (313) along the radial direction of the X-ray ring (3).

7. The static CT imaging system of claim 4, wherein: the number of the cathode ends (312) and the number of the anode targets (313) are multiple and correspond to each other one by one, all the cathode ends (312) are sequentially arranged along the circumferential direction of the X-ray ring (3), and all the anode targets (313) are sequentially arranged along the circumferential direction of the X-ray ring (3).

8. The static CT imaging system of claim 4, wherein: the 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 restrain X-rays emitted by the cathode unitized X-ray emitting device (31).

9. The static CT imaging system of claim 8, wherein: the collimating ring (5) comprises a torus (51) and a collimating hole structure (52) which radially penetrates through the torus (51).