CN111759332A - Radian adjusting device, CT collimator and CT scanner - Google Patents
Radian adjusting device, CT collimator and CT scanner Download PDFInfo
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- CN111759332A CN111759332A CN202010606537.8A CN202010606537A CN111759332A CN 111759332 A CN111759332 A CN 111759332A CN 202010606537 A CN202010606537 A CN 202010606537A CN 111759332 A CN111759332 A CN 111759332A
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- arc
- adjusting
- shading
- radian
- adjustment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4064—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/06—Diaphragms
Abstract
The invention discloses a radian adjusting device, a CT collimator and a CT scanner. The radian adjusting device comprises a shading baffle which is made of an elastic material capable of deforming; the adjusting component and the arc-shaped bracket; the shading blocking piece is arranged in the arc-shaped support, and two ends of the shading blocking piece are arranged on the arc-shaped support through the adjusting assembly; the adjusting assembly adjusts the radian of the shading separation blade through relative movement with the arc-shaped support. The invention solves the technical problem that the radian of the conventional shading baffle sheet is set according to a theoretical value and can not be adjusted adaptively.
Description
Technical Field
The invention relates to the field of CT scanning equipment, in particular to a radian adjusting device, a CT collimator and a CT scanner.
Background
The collimator in the CT apparatus mainly functions to block unnecessary scattered rays and determine the coverage width of the X-ray beam in a single scan. The CT equipment is generally provided with a front collimator and a rear collimator; wherein, preceding collimator mainly sets up at the X-ray pipe front end, through two shading separation blades (generally the tungsten board) of parallel placement for X ray can only pass through from the gap of two shading separation blades, and the X ray that does not need is blockked by the shading separation blade, and the X ray of passing through can be projected on using focus as the arc detector of centre of a circle, through the steerable gap size of the removal of control shading separation blade, makes the width of the X ray of passing through different.
It is believed that the projection of the X-rays onto the detector through the collimator is preferably rectangular, which reduces the amount of extra dose the patient receives. The conventional two flat tungsten plates which are placed in parallel generate X-ray projections which are wide in the middle and narrow on two sides and are drum-shaped projections.
At present, to ensure that the projection of X-rays on a detector is rectangular, two schemes are commonly used: the flat tungsten plate with the arc-shaped edge is simple in structure and small in occupied space; the other is that the arc-shaped tungsten plate (taking an X-ray focus as a circle center) designed with parallel edges has a slightly complex structure and occupies a larger space.
In actual operation, although the two designs solve the problem of ensuring that the generated X-ray projection is rectangular to some extent, the following problems exist: the arc-shaped edge of the flat tungsten plate and the radian of the arc tungsten plate are processed and manufactured according to theoretical values obtained through calculation, the single arc-shaped processing has high precision requirements on the process, the requirements on production and assembly are harsh, unnecessary errors are easily caused, and meanwhile, the single arc-shaped design is difficult to completely match the radian of detectors among different CT system individuals.
Disclosure of Invention
The invention mainly aims to provide a radian adjusting device, a CT collimator and a CT scanner, which aim to solve the technical problem that the radian adjustment cannot be adaptively performed because the radian of a conventional shading baffle is set according to a theoretical value.
In order to achieve the above object, according to one aspect of the present application, there is provided an arc adjustment device.
The radian adjusting device according to the application of the invention comprises:
an arc adjustment device, comprising:
the shading baffle is made of an elastic material which can be deformed;
the adjusting component and the arc-shaped bracket;
the shading blocking piece is arranged in the arc-shaped support, and two ends of the shading blocking piece are arranged on the arc-shaped support through the adjusting assembly; the adjusting assembly adjusts the radian of the shading separation blade through relative movement with the arc-shaped support.
Furthermore, the adjusting assembly comprises a first contact surface connected with the upper end face of the shading separation blade and a second contact surface connected with the lower end face of the shading separation blade, and the radian of the shading separation blade is adjusted by adjusting the vertical distance between the first contact surface and the second contact surface.
Furthermore, the adjusting assembly comprises a limiting part and an adjusting part, the limiting part is used for highly fixing the upper end face or the lower end face of the shading separation blade, and the adjusting part is used for highly adjusting the lower end face or the upper end face of the shading separation blade.
Furthermore, the limiting part is arranged on the upper end face of the shading blocking piece, and the adjusting part is arranged on the lower end face of the shading blocking piece.
Furthermore, the adjusting assembly further comprises a bolt for fixing the position of the limiting member and the adjusting member.
Further, the adjusting piece is an adjusting bolt.
Further, the locating part includes spacing bolt and stopper, the stopper is right the shading separation blade carries out the rigidity, spacing bolted connection the stopper, spacing bolt sets up on the arc support.
In order to achieve the above object, according to another aspect of the present application, there is provided a CT collimator.
The CT collimator according to the invention comprises any one of the radian adjusting devices.
Furthermore, the device comprises two groups of radian adjusting devices which are arranged in parallel.
To achieve the above object, according to another aspect of the present application, there is provided a CT scanner.
A CT scanner according to the present application comprises a CT collimator as described in any of the above.
In the embodiment of the invention, a relative position adjusting mode is adopted, the end part of the shading separation blade is connected through the adjusting component, the shading separation blade is fixed on the arc-shaped support, and the adjusting component drives the shading separation blade to move relative to the arc-shaped support, so that the purposes that the position of the whole shading separation blade relative to the arc-shaped support is unchanged and the stress of the end part of the shading separation blade is changed are achieved, the technical effect of self radian adjustment of the shading separation blade is realized, and the technical problem that the radian adjustment cannot be carried out in an adaptive manner due to the fact that the radian setting is carried out on the conventional shading separation blade according to a theoretical value is solved.
In addition, the CT collimator comprising the radian adjusting device provided by the invention adjusts the radian of the shading blocking sheet through an adjusting component in the radian adjusting device, so that the projection width of the X-ray beam on the detector is adjusted. The projection projected on the detector can be better ensured to be rectangular, and meanwhile, the limit width of X-rays after the detection limit can be realized in an auxiliary mode, so that the redundant dose borne by a patient is reduced. The requirement of the radian of the shading baffle of the collimator on the production process is greatly reduced, the cost is saved, and the production efficiency is improved. The technical problems that the CT collimator has large use error and is difficult to adapt to the radian of detectors among different CT system individuals due to the fact that the single arc-shaped machining has high precision requirement on the process and the requirement on production and assembly is harsh are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the invention and to make further features, objects, and advantages of the invention apparent. The drawings and their description illustrate exemplary embodiments of the invention and do not limit it inappropriately. In the drawings:
fig. 1 is a schematic view of the overall structure of an arc adjustment device according to an embodiment of the present invention;
fig. 2 is a partial structural view of an arc adjustment device according to an embodiment of the present invention.
Detailed Description
In order to make the person skilled in the art better understand the application scheme of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, shall fall within the scope of protection of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present application are described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the drawings.
The technical scheme of the invention is mainly directed at the field of CT scanning, particularly to a specific theoretical calculation method of X-rays and a corresponding shading effect, and is combined with actual improvement and adjustment of the overall structure of a product.
The research shows that the distance from the ray emitting point to each point on the shading baffle (the radian of the tungsten plate) determines the projection width of the X-ray projected on the detector. In order to ensure that the projection on the detector is rectangular, the radian of the collimator shading blocking piece is required to be consistent with that of the detector, namely, the arc of the detector and the arc of the collimator shading blocking piece are arcs taking the focus as the center of a circle.
The following parameters were set:
distance r1 from the focal point to the light shielding plate;
focal point to detector distance r 2;
opening (light shielding flap slit width) w1 of the collimator;
the projection width of the X-ray on the detector is w 2;
the following relationships apply:
r1/-r2.═ w1/-w2 (equation 1)
Namely: w2 ═ w1 r2/r1 (equation 2)
The projection width w2 of the X-ray on the detector is inversely proportional to the distance r1 from the focal point to the light shielding plate. Moreover, because the two shading baffles are parallel and the radian is consistent with that of the detector (ensuring r1 and r2 to be unchanged), after the size of the collimator opening w1 is changed, the distances from each point on the arc line of the shading baffles to the focus are still equal, and the projection width w2 of the X-ray on the detector on the radian of the detector is also equal at each point, namely the projection area of the X-ray on the detector is still rectangular.
The area of the X-ray projected onto the detector is mainly the following three cases:
the first condition is as follows: the projection area of the X-ray on the detector is rectangular, and the distances from each point on the arc lines of the two shading blocking pieces to the focus are equal without adjustment.
Case two: the projection area of the X-ray on the detector is convex, and an adjusting screw needs to be fastened, so that the distance from the edge of the shading blocking piece to the focus is reduced.
Case three: the projection area of the X-ray on the detector is concave, and the adjusting screw needs to be loosened to increase the distance from the edge of the shading blocking piece to the focus.
Because the screw pitch of screw is fixed, the radian of control shading separation blade that can be fine through adjusting the screw to guarantee that the projection area of X ray on the detector is the rectangle. In combination with the above analysis, the technical scheme of the present invention is as follows:
as shown in fig. 1, the present invention relates to an arc degree adjusting device, which includes a light shielding blocking piece 1, an adjusting assembly 2 and an arc-shaped support 3, wherein the light shielding blocking piece 1 is arranged in the arc-shaped support 3, two ends of the light shielding blocking piece are arranged on the arc-shaped support 3 through the adjusting assembly 2, and the adjusting assembly 2 adjusts the arc degree of the light shielding blocking piece 1 through relative movement with the arc-shaped support 3.
In a preferred embodiment of the present application, the adjusting assembly 2 includes a first contact surface connected to the upper end surface of the shading baffle 1 and a second contact surface connected to the lower end surface of the shading baffle 1, and the adjusting assembly 2 adjusts the radian of the shading baffle 1 by adjusting the vertical distance between the first contact surface and the second contact surface.
In a preferred embodiment of the present invention, the adjusting assembly 2 includes a limiting member 201 and an adjusting member 202, and when the limiting member 201 fixes the height of the upper end surface of the light shielding barrier 1, the adjusting member 202 adjusts the height of the lower end surface of the light shielding barrier 1; when the limiting member 201 fixes the height of the lower end surface of the light shielding barrier 1, the adjusting member 202 adjusts the height of the upper end surface of the light shielding barrier 1. In a further preferred embodiment of the present application, the limiting member 201 is disposed on an upper end surface of the light shielding plate 1, and the adjusting member 202 is disposed on a lower end surface of the light shielding plate 1.
In the preferred embodiment of the present invention, the adjusting member 202 is an adjusting bolt, the adjusting bolt can control the radian of the shading baffle 1, and the clockwise fastening of the adjusting bolt can press the shading baffle to be bent, so that the radian of the shading baffle is reduced; otherwise, the adjusting bolt is loosened anticlockwise, the shading separation blade is naturally recovered, and the radian of the shading separation blade is increased. The limiting part 201 comprises a limiting bolt 2011 and a limiting block 2012, the limiting bolt 2011 is connected with the limiting block 2012, and the limiting bolt 2011 is arranged on the arc-shaped support 3.
The limiting bolt 2011 is provided with the limiting block 2012, the limiting bolt 2011 can move up and down the limiting block 2012 through clockwise or anticlockwise rotation, before the radian is adjusted, the limiting bolt 2011 needs to be released firstly to enable the limiting block 2012 to be separated from the shading separation blade 1, and after the radian adjustment of the shading separation blade 1 is completed, the limiting bolt 2011 is adjusted again to enable the limiting block 2012 to clamp the shading separation blade 1. The limiting block 2012 is arranged on the limiting bolt 2011, the shading separation blade 1 is clamped in the opposite direction of the adjusting bolt, and the unstable change of the radian of the shading separation blade 1 is prevented.
In the preferred embodiment of the present invention, the adjusting assembly 2 further includes a bolt 203 for fixing the position of the limiting member 201 and the adjusting member 202. The adjustment of the adaptability is convenient to carry out. In the preferred embodiment, at least two sets of bolts 203 are included for locking the adjusting bolt and the limiting bolt respectively, so as to prevent the arc shape of the shading baffle from changing after the adjusting bolt and the fixing bolt rotate automatically.
In a further preferred embodiment of the present application, the light shielding baffle 1 is a tungsten plate.
In order to achieve the above object, according to another aspect of the present application, there is provided a CT collimator.
The CT collimator according to the invention comprises any one of the radian adjusting devices.
Furthermore, the device comprises two groups of radian adjusting devices which are arranged in parallel.
To achieve the above object, according to another aspect of the present application, there is provided a CT scanner.
A CT scanner according to the present application comprises a CT collimator as described in any of the above.
In the embodiment of the invention, a relative position adjusting mode is adopted, the end part of the shading separation blade is connected through the adjusting component, the shading separation blade is fixed on the arc-shaped support, and the adjusting component drives the shading separation blade to move relative to the arc-shaped support, so that the purposes that the position of the whole shading separation blade relative to the arc-shaped support is unchanged and the stress of the end part of the shading separation blade is changed are achieved, the technical effect of self radian adjustment of the shading separation blade is realized, and the technical problem that the radian adjustment cannot be carried out in an adaptive manner due to the fact that the radian setting is carried out on the conventional shading separation blade according to a theoretical value is solved.
In addition, the CT collimator comprising the radian adjusting device provided by the invention adjusts the radian of the shading blocking sheet through an adjusting component in the radian adjusting device, so that the projection width of the X-ray beam on the detector is adjusted. The projection projected on the detector can be better ensured to be rectangular, and meanwhile, the limit width of X-rays after the detection limit can be realized in an auxiliary mode, so that the redundant dose borne by a patient is reduced. The requirement of the radian of the shading baffle of the collimator on the production process is greatly reduced, the cost is saved, and the production efficiency is improved. The technical problems that the CT collimator has large use error and is difficult to adapt to the radian of detectors among different CT system individuals due to the fact that the single arc-shaped machining has high precision requirement on the process and the requirement on production and assembly is harsh are solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An arc adjustment device, comprising:
the shading baffle is made of an elastic material which can be deformed;
the adjusting component and the arc-shaped bracket;
the shading blocking piece is arranged in the arc-shaped support, and two ends of the shading blocking piece are arranged on the arc-shaped support through the adjusting assembly; the adjusting assembly adjusts the radian of the shading separation blade through relative movement with the arc-shaped support.
2. The arc adjustment device of claim 1, wherein the adjustment assembly comprises a first contact surface connected to an upper end surface of the light blocking flap and a second contact surface connected to a lower end surface of the light blocking flap, the adjustment assembly adjusting the arc of the light blocking flap by adjusting a vertical distance between the first contact surface and the second contact surface.
3. The radian adjusting device of claim 2, wherein the adjusting assembly comprises a limiting member and an adjusting member, the limiting member fixes the height of the upper end surface or the lower end surface of the shading baffle, and the adjusting member adjusts the height of the lower end surface or the upper end surface of the shading baffle.
4. The radian adjustment device of claim 3, wherein the limiting member is arranged on the upper end surface of the shading baffle, and the adjusting member is arranged on the lower end surface of the shading baffle.
5. The arc adjustment device of claim 3, wherein the adjustment assembly further comprises a bolt that positionally fixes the stop and the adjustment member.
6. The arc adjustment device of any one of claims 3 to 5 wherein the adjustment member is an adjustment bolt.
7. The radian adjusting device of claim 6, wherein the limiting member comprises a limiting bolt and a limiting block, the limiting block fixes the position of the shading blocking piece, the limiting bolt is connected with the limiting block, and the limiting bolt is arranged on the arc-shaped bracket.
8. A CT collimator comprising the arc adjustment apparatus of any one of claims 1 to 7.
9. The CT collimator of claim 8, comprising two sets of said arc adjustment means arranged in parallel.
10. A CT scanner comprising a CT collimator according to any of claims 8 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010606537.8A CN111759332A (en) | 2020-06-29 | 2020-06-29 | Radian adjusting device, CT collimator and CT scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010606537.8A CN111759332A (en) | 2020-06-29 | 2020-06-29 | Radian adjusting device, CT collimator and CT scanner |
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| Publication Number | Publication Date |
|---|---|
| CN111759332A true CN111759332A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010606537.8A Pending CN111759332A (en) | 2020-06-29 | 2020-06-29 | Radian adjusting device, CT collimator and CT scanner |
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| CN (1) | CN111759332A (en) |
Citations (8)
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| JPH06269440A (en) * | 1993-03-16 | 1994-09-27 | Toshiba Corp | X-ray detector |
| JP2002034966A (en) * | 2000-07-19 | 2002-02-05 | Shimadzu Corp | X-ray ct apparatus |
| US20020015474A1 (en) * | 2000-07-31 | 2002-02-07 | Analogic Corporation | X-ray collimator |
| US20050152500A1 (en) * | 2002-08-02 | 2005-07-14 | Luigi Besana | Device for adjustment of the anti-scattering grid to the focal length for radiological equipment |
| CN1681437A (en) * | 2002-09-16 | 2005-10-12 | 西门子公司 | Computer X-ray camera machine with diaphragm device on the X-ray side and method for circulating it |
| CN101011250A (en) * | 2006-02-01 | 2007-08-08 | 西门子公司 | Focus detector arrangement for generating phase-contrast X-ray images and method for this |
| CN103489496A (en) * | 2013-09-10 | 2014-01-01 | 沈阳东软医疗系统有限公司 | X-ray collimating device for CT machine |
| CN206466787U (en) * | 2017-01-03 | 2017-09-05 | 珠海市华纶无纺布有限公司 | A kind of arc expanding apparatus of terylene fabric hot rolled nonwoven fabrics |
-
2020
- 2020-06-29 CN CN202010606537.8A patent/CN111759332A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269440A (en) * | 1993-03-16 | 1994-09-27 | Toshiba Corp | X-ray detector |
| JP2002034966A (en) * | 2000-07-19 | 2002-02-05 | Shimadzu Corp | X-ray ct apparatus |
| US20020015474A1 (en) * | 2000-07-31 | 2002-02-07 | Analogic Corporation | X-ray collimator |
| US20050152500A1 (en) * | 2002-08-02 | 2005-07-14 | Luigi Besana | Device for adjustment of the anti-scattering grid to the focal length for radiological equipment |
| CN1681437A (en) * | 2002-09-16 | 2005-10-12 | 西门子公司 | Computer X-ray camera machine with diaphragm device on the X-ray side and method for circulating it |
| CN101011250A (en) * | 2006-02-01 | 2007-08-08 | 西门子公司 | Focus detector arrangement for generating phase-contrast X-ray images and method for this |
| CN103489496A (en) * | 2013-09-10 | 2014-01-01 | 沈阳东软医疗系统有限公司 | X-ray collimating device for CT machine |
| CN206466787U (en) * | 2017-01-03 | 2017-09-05 | 珠海市华纶无纺布有限公司 | A kind of arc expanding apparatus of terylene fabric hot rolled nonwoven fabrics |
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Address after: 100176 1st floor, building 8, 11 Kangding street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Applicant after: Sinovision Technology (Beijing) Co.,Ltd. Address before: 1 / F, building 8, No. 11, Kangding street, Daxing Economic and Technological Development Zone, Beijing 100176 Applicant before: SAINUO WEISHENG TECHNOLOGY (BEIJING) Co.,Ltd. |