CN217066405U

CN217066405U - CT system with fixed radiation source and detector

Info

Publication number: CN217066405U
Application number: CN202120703141.5U
Authority: CN
Inventors: 王飞; 余文锐
Original assignee: Hefei Yofo Medical Technology Co ltd
Current assignee: Hefei Yofo Medical Technology Co ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2022-07-29
Anticipated expiration: 2031-04-07

Abstract

The present disclosure provides a fixed CT system of radiation source and detector, comprising: a source emitting X-rays and having a fixed position; the detector receives the X-rays emitted by the source and is fixed in position; the rotary platform bears the measured object and can be rotated so as to drive the borne measured object to rotate, so that in the rotating process of the measured object, the radiation source irradiates the rotating measured object, and the detector obtains an electric signal according to the received X-ray energy; and a processing device for obtaining an image of the object based on the electrical signal.

Description

CT system with fixed radiation source and detector

Technical Field

The present disclosure relates to a fixed CT system with a radiation source and a detector.

Background

Computed Tomography (CT) plays a significant role in medical imaging at present, and conventional CT can provide three-dimensional information with high definition, but has a large radiation dose and a high price, and is limited to be applied in oral medicine in particular.

The novel cone beam ct (cbct) system has the significant advantages of small radiation dose, high resolution, low price, and the like. Conventional CBCT systems rotate the source and detector around the scanned object and then generate three-dimensional information of the object by three-dimensional reconstruction techniques.

The traditional cone beam CT system has the advantages of complex and dispersed structure, high gravity center of the whole machine and high equipment installation requirement. Since the source and detector need to be rotated, drive circuitry (e.g., for driving rotation of the rotary arm to rotate the source and detector) and circuitry for performing other functions are typically provided therein. The vertical fixing frame and the rotating arm are far away from the ground, so that the wiring arrangement of various circuits inside the cone beam CT is complicated and needs to be arranged to avoid being exposed outside as much as possible. Furthermore, since the source and detector are fixed to the rotary arm, the wiring arrangement for supplying the source and detector with voltage is also relatively complicated.

The traditional cone beam CT system has a small imaging visual field and serious cone beam artifacts due to the limitation of a mechanical structure, and the cone beam CT system based on the rotation of a shell (a radiation source and a detector) has high requirements on the structure and the function of the shell while realizing a large visual field, so that the cost is high, and the volume is lower than that of the traditional spiral CT but cannot reach the optimal volume.

SUMMERY OF THE UTILITY MODEL

In order to solve one of the above technical problems, the present disclosure provides a CT system with a fixed radiation source and a fixed detector.

According to an aspect of the present disclosure, there is provided a source and detector fixed CT system, comprising:

a source that emits X-rays and whose position is fixed;

a detector that receives X-rays emitted by the source and whose position is fixed;

the rotating platform bears a measured object and can be rotated so as to drive the borne measured object to rotate, so that the radiation source irradiates the rotating measured object in the rotating process of the measured object, and the detector obtains an electric signal according to the received X-ray energy; and

and the processing device obtains an image of the measured object according to the electric signal.

The CT system according to at least one embodiment of the present disclosure further includes a rotation driving device that controls rotation of the rotation platform.

According to the CT system of at least one embodiment of this disclosure, the rotation driving device includes:

a rotation support rotatably coupled to the rotation platform such that the rotation platform can rotate relative to the rotation support;

a driving part interacting with the rotation support part so that the rotation platform is rotated by the action of the driving part with the rotation support part, or interacting with the rotation platform so that the rotation platform is rotated by the action of the driving part with the rotation platform.

According to the CT system of at least one embodiment of the present disclosure, the driving part is a driving gear, gear teeth of the driving gear are engaged with the gear teeth provided on the rotation support part, and the driving gear is fixedly configured with respect to the rotation platform,

the rotary driving device further comprises a driving motor, wherein a motor shaft of the driving motor is fixedly connected relative to the driving gear so as to drive the driving gear to rotate through the rotation of the motor shaft, and the rotating platform is driven to rotate through the driving gear based on the meshing effect of the gear teeth of the driving gear and the gear teeth of the rotary supporting part.

According to the CT system of at least one embodiment of the present disclosure, the rotation support includes:

the outer ring piece is fixedly connected with a fixed base of the CT system;

the inner ring piece is connected with the rotating platform, and the outer ring piece is positioned on the periphery of the inner ring piece; and

the rolling body is arranged between the outer ring piece and the inner ring piece;

the outer ring piece is provided with gear teeth meshed with the gear teeth of the driving gear, and the driving gear can rotate around the outer ring piece so as to drive the rotating platform and the inner ring piece to rotate relative to the outer ring piece.

According to the CT system of at least one embodiment of the present disclosure, the number of the gear teeth of the driving gear is less than the number of the gear teeth of the outer ring member.

According to the CT system of at least one embodiment of the present disclosure, a motor shaft of the driving motor is fixedly arranged in an inner hole of the driving gear, and the driving gear does not rotate relative to the motor shaft.

A CT system according to at least one embodiment of the present disclosure further includes a motor flange to which the drive motor is fixedly mounted and which is fixedly connected with the rotating platform such that the drive gear is fixedly configured relative to the rotating platform.

In accordance with a CT system of at least one embodiment of the present disclosure, the source and the detector are fixed in a peripheral position on the rotating platform.

According to a CT system of at least one embodiment of the present disclosure, the CT system is a cone beam CT system.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 shows a schematic view of a CT system according to an embodiment of the present disclosure.

FIG. 2 illustrates a partial schematic view of a CT system, according to one embodiment of the present disclosure.

FIG. 3 shows a partial cross-sectional schematic view of a CT system according to one embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., as in "sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

According to one embodiment of the present disclosure, a source and detector-mounted CT system is provided. Wherein the CT system may be a cone beam CT (cbct) system.

The term "source and detector fixed" as used herein means: when the CT system works, the radiation source and the detector do not rotate and are always in a fixed position.

As shown in fig. 1, the CT system may include a source 100, a detector 200, and a rotating platform 300.

The source 100 may emit X-rays, such as cone beam X-rays, and the source 100 may be secured by a source mount 110, and in one embodiment, the source may be secured to a base 400 of the CT system by the source mount 110. Furthermore, the required wiring of the source 100 can be provided in the source holder 110, for example a space can be provided in the source holder 110 which allows the wiring to pass through.

Detector 200 may be a flat panel detector and is configured to receive X-rays emitted by source 100. This allows the X-ray emitted from the source 100 to be irradiated to the object to be measured and then received by the detector 200, and the detector 200 obtains an electric signal according to the received X-ray energy. The CT system may further include a processing device that obtains an image of the object based on the electrical signal.

The position of the detector 200 may also be fixed and may be fixed by the detector fixture 210, and the detector fixture 210 may be fixed with the base 400 of the CT system. In addition, a wiring required for the probe 200 may be provided in the probe holder 210, for example, a space allowing the wiring to pass may be provided in the probe holder 210.

As shown in fig. 1, the source holder 110 and the detector holder 210 may be disposed on the base 400, and may be disposed to face each other on both sides of the object to be measured.

The rotary platform 300 can bear the object to be measured and can be rotated so as to drive the borne object to be measured to rotate, so that in the rotating process of the object to be measured, the radiation source irradiates the rotating object to be measured, and the CT data of the object to be measured can be obtained. For example, the rotary platform 300 may be disposed on the base 400 and may be capable of rotating with respect to the base 400.

In addition, the measured object can be the oral cavity of a human body, and the CT data of the oral cavity teeth can be obtained through the CT system.

In addition, a seat 500, a head support 600, and a head support 610 may be provided on the rotary platform 300, and a subject may sit on the seat 500 and rest the head on the head support 600, and the head support 600 may be connected with the head support 610, and the head support 610 may be fixed to the rotary platform. When the rotary platform 300 rotates, the seat 500 is driven to rotate, and the testee sitting on the seat 500 rotates accordingly.

Compared with the prior art that the radiation source and the detector rotate to shoot, the CT system of the disclosure has compact structure and lower equipment installation requirement. The rotation of the system is realized by the rotation of the tested object, the rotation radius is greatly reduced, the required rotation moment is synchronously reduced, simultaneously, the ultra-long distance of a radiation source and a detector can be realized, the cone beam artifact of the CBCT is greatly reduced, and the FOV is effectively increased.

In the present disclosure, the detector and source may be mounted independently or variably assembled as desired for the application. And the fixed positions of the radiation source and the detector can facilitate wiring and assembly.

The CT system according to an embodiment of the present disclosure further includes a rotation driving device that controls rotation of the rotary platform.

Fig. 2 illustrates a rotary drive device 700 according to one embodiment of the present disclosure. The rotation driving device 700 is used to control the rotation of the rotary platform 300.

As shown in fig. 2, the rotation driving device 700 may include a rotation support 710 and a driving gear 720.

The rotation support 710 is rotatably coupled to the rotation platform 300 such that the rotation platform 300 can rotate with respect to the rotation support 710.

The gear teeth of the driving gear 720 are engaged with the gear teeth provided to the rotary support 710, and the driving gear 720 is fixedly disposed with respect to the rotary platform 300 such that the rotary platform 300 is rotated by the driving of the driving gear 720.

The rotation support 710 may include an outer ring member 711, an inner ring member 712, rolling bodies, and the like.

The outer ring 711 is fixedly connected to the fixing base 400 of the CT system, for example, the outer ring 711 may be fixedly connected to the fixing base 400 by bolts. A set of through holes may be provided in the outer ring member 711 through the thickness direction thereof, and the through holes may be aligned with screw holes provided in the fixing base 400, respectively, and bolts may be screwed through the through holes and fixed, thereby fixing the outer ring member 711 to the fixing base 400.

The inner ring member 712 is located inside the outer ring member 711, and the inner ring member 712 is rotatable relative to the outer ring member 711. The rotating platform 200 may be connected to the inner ring member 712, for example, at the outer circumference or the center of the inner ring member 712, for example, when the inner ring member 712 is in a ring shape, the rotating platform 200 is fixedly connected to the outer circumference of the inner ring member 712, for example, the inner ring member 712 may be in a circular plate shape, and the rotating platform 200 is fixed to the center of the circular plate.

Rolling elements, such as balls, are provided between the inner ring part 712 and the outer ring part 711.

The rotational support 710 may be in the form of a bearing and it is capable of simultaneously withstanding large axial, radial loads and overturning moments.

The outer ring member 711 is provided with gear teeth engaged with the gear teeth of the driving gear 720 on the outer circumference, and the driving gear 720 can rotate around the outer ring member 711, so as to drive the rotary platform 300 and the inner ring member 712 to rotate relative to the outer ring member 711. Such that power transmission is provided when the gear teeth of the outer ring member 711 and the gear teeth of the driving gear 720 are engaged with each other.

The number of teeth of the driving gear 720 is less than the number of teeth provided in the outer ring member 711. The gearing of the gear wheel may thus be a reduction gearing.

The rotary drive device further comprises a drive motor 730, and a motor shaft of the drive motor 730 is fixedly connected with respect to the drive gear 720, so that the drive gear 720 is driven to rotate by the rotation of the motor shaft. The motor shaft of the driving motor 730 is fixedly disposed at the inner hole of the driving gear 720, and the driving gear 720 is not rotated with respect to the motor shaft.

The rotary drive further includes a motor flange 740, the drive motor 730 is fixedly mounted to the motor flange 740, and the motor flange 740 is fixedly connected with the rotary platform 300 such that the drive gear 720 is fixedly arranged relative to the rotary platform 300.

Fig. 3 illustrates a partial cutaway view of a CT system according to the present disclosure.

The fixed base 400 may be a disk-shaped structure, and the bottom surface may have a plurality of feet 410, the feet 410 are disposed at the bottom of the CT system, and the CT system is placed on a flat ground surface when being installed, and the CT system is supported by the feet 410. The fixing base 400 is provided with a set of screw holes in a circumferential direction to fix the outer ring member 711.

The rotation support 710 may be a large bearing capable of bearing the combined load, and is mainly composed of an outer ring member 711, an inner ring member 712, rolling members 713, and the like. The outer ring member 711 and the inner ring member 712 can rotate relative to each other. The rotation support part 710 is located above the fixing base 400, the bottom end face of the outer ring member 711 is located in cooperation with the upper plane of the fixing base 400, a set of through holes penetrating through the thickness direction are formed in the outer ring member 711, the through holes are aligned with the threaded holes in the fixing base 400, and the bolts 810 are screwed in and fixed.

The rotary platform 400 is located above the rotary support part 710, and is in fit contact with the inner ring 712 of the rotary support part 710, and is fixed by bolts 820.

The motor flange 740 is a counter-sunk type revolving body structure and is located in a flange hole of the rotary platform 300, a step surface 741 of the motor flange 740 in the axial direction is matched and positioned with the upper plane of the rotary platform 300, and the step surface 741 and the upper plane of the rotary platform 300 are fixedly connected by bolts 830.

The driving motor 730, which may be a stepping motor, is mounted on the motor flange 740, and an output shaft of the driving motor 730 passes through a hole in the motor flange 740 and is fixed by bolts.

The driving gear 720 penetrates through an inner hole 721 to an output shaft 731 of the driving motor 730, is positioned by inserting a flat key 722 in the circumferential direction, is pressed on the end face of the driving gear 720 through a shaft end gasket 723 in the axial direction, and is screwed into a threaded hole in the output shaft of the driving motor 730 after passing through a hole in the shaft end gasket 723, so that the screws are tightened to ensure that the driving gear 720 has no displacement in the axial direction.

The driving gear 720 is engaged with the gear teeth of the outer ring member 711 of the rotation support part 710 to form power transmission.

After the driving motor 730 is powered on and started, the output shaft 731 of the driving motor 730 outputs torque, the driving gear 720 rotates, the outer ring member 711 of the rotating support part 710 is connected with the fixed base 400 to form a fixed part, and the driving gear 720 revolves around the axis of the outer ring member 711 of the rotating support part 710 through meshing transmission. Since the driving gear 720, the driving motor 730 and the rotary platform 300 are a relatively fixed joint component, that is, the driving gear 720 revolves around the axis while driving the joint component to revolve. Thus, each mechanism component mounted on the rotary platform 300 can perform a swing motion about the rotation support axis.

In summary, the rotating platform 300 is installed on the fixed base 400 in the above manner, so as to drive the seat to rotate 360 degrees, thereby implementing a CT system based on rotation of the object to be measured.

In the present disclosure, although the driving member is illustrated in the form of a driving gear, it will be understood by those skilled in the art that other forms of driving member may be used, such as a chain drive or the like. In addition, although it is described in the present disclosure that the driving member interacts with the rotation support to rotate the rotation platform. It should be understood that it may take other forms, etc. For example, a drive member or the like may be fixed to the base, and the rotary platform may be directly driven by the drive member, which may be in a conventional suitable drive manner. For example, a motor may be fixed in the base and the rotary platform may be driven by a gear fixed to the motor shaft (e.g., corresponding gear teeth may also be provided on the rotary platform).

According to the floor type cone-beam CT system disclosed by the invention, in order to overcome the technical limitations of the existing hollow rotating device and the limitations of cost, volume and the like of the device based on the rotation of the radiation source and the detector, the disclosure aims to provide a new solution of rotating motion for the floor type cone-beam CT system based on the fixed radiation source and the detector, and the floor type cone-beam CT system has the advantages of stable rotation, high control precision, simple structure, small volume and the like.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A source and detector fixed CT system, comprising:

a source that emits X-rays and whose position is fixed;

2. The CT system of claim 1, further comprising a rotational drive device that controls rotation of the rotating platform.

3. The CT system of claim 2, wherein the rotational drive comprises:

a driving part interacting with the rotation support part so as to rotate the rotation platform by the action of the driving part and the rotation support part; or the driving part interacts with the rotating platform so as to enable the rotating platform to rotate through the action of the driving part and the rotating platform.

4. The CT system of claim 3, wherein the drive portion is a drive gear having gear teeth that mesh with gear teeth provided with the rotational support portion and the drive gear is fixedly disposed relative to the rotational platform,

5. The CT system of claim 4, wherein the rotational support comprises:

the outer ring piece is fixedly connected with a fixed base of the CT system;

6. The CT system of claim 5, wherein the number of teeth of the drive gear is less than the number of teeth provided by the outer ring member.

7. The CT system of claim 5, wherein a motor shaft of the drive motor is fixedly disposed within the bore of the drive gear such that the drive gear does not rotate relative to the motor shaft.

8. The CT system of claim 7, further comprising a motor flange, the drive motor fixedly mounted to the motor flange, and the motor flange fixedly coupled to the rotating platform such that the drive gear is fixedly disposed relative to the rotating platform.

9. The CT system of claim 1, wherein the source and the detector are fixed in a peripheral position on the rotating platform.

10. The CT system of any of claims 1 to 9, wherein the CT system is a cone beam CT system.