CN104887259B - X-ray shielding piece for CT (computed tomography) machine collimator, use method of X-ray shielding piece and CT machine - Google Patents
X-ray shielding piece for CT (computed tomography) machine collimator, use method of X-ray shielding piece and CT machine Download PDFInfo
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- CN104887259B CN104887259B CN201410082163.9A CN201410082163A CN104887259B CN 104887259 B CN104887259 B CN 104887259B CN 201410082163 A CN201410082163 A CN 201410082163A CN 104887259 B CN104887259 B CN 104887259B
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Abstract
The invention relates to an X-ray shielding piece for a collimator of a CT (computed tomography) machine, a using method of the X-ray shielding piece and the CT machine. The X-ray shielding member includes: the baffle plate is provided with a window; and the movable piece is arranged in front of the blocking piece along the X-ray incidence direction and is used for blocking the window in a mode that the blocking range is adjustable.
Description
Technical Field
The invention relates to the technical field of CT machines, in particular to an X-ray shielding piece used on a collimator of a CT machine, a using method thereof and a corresponding CT machine.
background
the Collimator (collimater) in the CT machine can adjust and control the X-ray passing through the Collimator according to the requirements of users. One of its effects is to reduce the radiation dose of X-rays to the patient.
The existing collimator reduces the radiation of X-rays to a patient by arranging a shielding piece on the collimator. As shown in fig. 1, the baffle 102 is an X-ray shield on the collimator 101, which is provided with a window 103 so that X-rays can pass therethrough. The window 103 is generally the same size as the array in the X-ray Detector (Detector) of the CT machine, so that only X-rays to be projected onto the array pass through the window.
During a CT scan, the width of some organs or tissues may be smaller than the arrangement width of the array in the X-ray detector of the CT machine. Thus, even if the X-ray is blocked by the existing shielding member, a part of the X-ray is radiated to the part of the patient where the CT scanning is not needed. This brings unnecessary X-ray radiation to the patient.
disclosure of Invention
The invention aims to provide an X-ray shielding piece used on a collimator of a CT (computed tomography) machine, a using method thereof and the corresponding CT machine, which can further reduce ray radiation to a human body in the CT scanning process.
One embodiment of the present invention provides an X-ray shield for a collimator of a CT machine, comprising: the baffle plate is provided with a window; and the movable piece is arranged in front of the blocking piece along the X-ray incidence direction and is used for blocking the window in a mode that the blocking range is adjustable.
Another embodiment of the invention provides a CT machine comprising an X-ray shield according to the invention.
yet another embodiment of the present invention provides a method of using an X-ray shield on a collimator of a CT machine, comprising: determining the information of an effective channel of a detector of the CT machine according to the range of the scanned part; calculating a shading range for the collimator from the information; and adjusting the X-ray shielding piece according to the shielding range.
Drawings
The invention may be better understood by describing embodiments of the invention in conjunction with the following drawings, in which:
FIG. 1 is a schematic view of a shield of a prior art collimator;
FIG. 2 is a schematic view of the general construction of one embodiment of a shield for a collimator of the present invention;
FIG. 3 is a schematic diagram illustrating the general configuration of one embodiment of a shield on the collimator of the present invention with the cover 202 of FIG. 2 open;
FIG. 4 is a schematic view of a first embodiment of the movable element in the X-ray shield of the collimator according to the invention;
FIG. 5 is a schematic structural view of a second embodiment of the movable element in the X-ray shield in the collimator according to the invention;
FIG. 6 shows a schematic structural view of a third embodiment of the movable parts in the X-ray shield in the collimator according to the invention;
FIG. 7 is a schematic structural view of a fourth embodiment of the movable element in the X-ray shield in the collimator according to the invention;
FIG. 8 is a schematic view of one embodiment of the chain in the covering of the present invention;
FIG. 9 is a schematic view of an embodiment of a link plate in the chain;
FIG. 10 is a schematic view of one embodiment of a wound member of the invention;
FIG. 11 is a flow chart illustrating one embodiment of a method of using X-ray shields on a collimator of a CT machine in accordance with the present invention.
Detailed Description
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions are made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be further appreciated that such a development effort might be complex and tedious, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as a complete understanding of this disclosure.
Unless otherwise defined, technical or scientific terms used in the claims and the specification should have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalent, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, nor are they restricted to direct or indirect connections.
in order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 shows a schematic general structural view of an embodiment of a shield on a collimator according to the invention.
In one embodiment of the invention, the X-ray shield 200 on the collimator 101 comprises a shutter (not shown) with a window opening in it, which shutter allows only X-rays passing through the window portion to penetrate. The shutter 200 further comprises a movable member 201 located near the shutter, the movable member 201 being capable of further adjusting the X-rays passing through the window. Namely: the movable member 201 can partially cover some positions in the window of the blocking sheet according to the needs of the user, and can also cover all positions of the window of the blocking sheet.
In one embodiment of the present invention, the X-ray shielding member 200 can be disposed in front of the shielding plate at a position close to the shielding plate. The X-ray shield 200 can be provided with a cover 202 to enclose it, but the cover 202 does not significantly attenuate the X-rays.
referring to fig. 3, fig. 3 is a schematic diagram showing the general structure of one embodiment of the X-ray shield on the collimator of the present invention when the cover 202 of fig. 2 is opened.
In fig. 3, the X-ray shielding member 200 may include a shutter (not shown) having a window formed thereon, and the movable member 201 may include a shielding block 301, a chain 302, a guide rail 303, and a winding member 304. The shielding block 301 may be made of a material selected to effectively shield X-rays, thereby serving to block X-rays passing through the window in the shutter. The guide rails 303 serve to guide the shield block 301 and define a path and range of motion of the shield block 301 such that the shield block 301 moves along a path determined by the guide rails. Chain 302 may be made of a material selected to effectively shield X-rays. One end of the chain 302 may be connected to the shielding block 301 and the other end may be connected to the winding member 304, so that the chain and the shielding block may move together. During movement of the chain 302, the winding member 304 is able to rotate about an axis such that the chain 302 winds in and out along its outer circumference.
when the window on the blocking sheet needs to be blocked, an external force can be applied to the shielding block 301 in an electric or manual mode, or the external force can be applied to the winding piece 304 in an electric or manual mode to enable the winding piece to rotate around the shaft, so that the shielding block 301 is moved to a proper position.
Referring to fig. 4, fig. 4 is a schematic structural view showing a first embodiment of the movable member in the X-ray shield in the collimator according to the present invention.
In one embodiment of the present invention, the movable member 201 in the X-ray shielding member may include a pair of linear motors 401, a pair of chains 302, and a pair of winding members 304. The linear motor 401 with its own slide block 4011 can be used as the shielding block 301 in fig. 3. In one embodiment of the present invention, the linear motor 401 can be used with its own guide 4012 to function as the guide 303 of fig. 3. The chain 302 is connected at one end to the slide 4011 and at the other end to the winding member 304.
In one embodiment of the present invention, the length of each guide 4012 can be designed such that the slide 4011 connected thereto can move to the full extent of the window, namely: the length of the rail may cover the full extent of the window. Of course, the length of each chain 302 may be designed to cover the full extent of the window.
In practical use, under the driving of the linear motor 401, the sliding block 4011 moves along the guide rail 4012, and pulls the chain 302 to move together. When the slider 4011 moves away from the winding member 304, the chain 302 winds out along the outer periphery of the winding member 304, and when the slider 4011 moves closer to the winding member 304, the chain 302 winds in along the outer periphery of the winding member 304.
Referring to fig. 5, fig. 5 shows a schematic structural view of a second embodiment of the moving parts in the X-ray shield in the collimator according to the invention.
Similar to the embodiment shown in fig. 4, in one embodiment of the present invention, the movable member 201 of the X-ray shielding member may also include a pair of linear motors 501, a pair of chains 502, and a pair of winding members 304. In one embodiment of the present invention, the length of each rail 5012 can be designed such that the slider 5011 attached thereto can only move within a portion of the window, for example: each guide rail 5012 is respectively located in the left half window range and the right half window range, namely: the length of each rail covers a partial range of the window. Of course, the length of each chain 502 may be designed to cover only a portion of the window.
Referring to fig. 6, fig. 6 shows a schematic structural view of a third embodiment of the moving parts in the X-ray shield in the collimator according to the invention.
in one embodiment of the present invention, the movable member 201 of the X-ray shielding member may include a pair of rotating electric machines 601, a pair of shielding blocks 301, a pair of chains 302, a pair of guide rails 303, and a pair of winding members 304. One end of the chain 302 is connected to the shielding block 301 and the other end is connected to the winding member 304. The shielding block 301 is movable on the guide rails 303 and moves the chains 302 in one motion. When the shielding block 301 moves away from the winding member 304, the chain 302 winds out along the outer periphery of the winding member 304, and when the shielding block 301 moves closer to the winding member 304, the chain 302 winds in along the outer periphery of the winding member 304.
In one embodiment of the present invention, the length of each rail 303 may be designed such that the shielding block 301 connected thereto can move to the full extent of the window, namely: the length of the rail may cover the full extent of the window. Of course, the length of each chain 302 may be designed to cover the full extent of the window.
In practical use, under the driving of the rotating motor 601, the winding element 304 rotates around its rotating shaft, so that the chain 302 winds in or out along the outer circumference of the winding element 304, and further drives the shielding block 301 to move along the guide rail 303.
Referring to fig. 7, fig. 7 shows a schematic structural view of a fourth embodiment of the moving parts in the X-ray shield in the collimator according to the invention.
Similar to the embodiment shown in fig. 6, in one embodiment of the present invention, the movable member 201 in the X-ray shielding member may include a pair of rotating motors 601, a pair of shielding blocks 301, a pair of chains 701, a pair of guide rails 702, and a pair of winding members 304. The chain 701 is connected at one end to the shielding block 301 and at the other end to the winding member 304. The shielding block 301 is movable on the guide rail 702 and moves the chain 701 along. When the shielding block 301 moves away from the winding member 304, the chain 701 winds out along the outer periphery of the winding member 304, and when the shielding block 301 moves closer to the winding member 304, the chain 701 winds in along the outer periphery of the winding member 304. In one embodiment of the present invention, the length of each rail 702 may be designed such that the shielding block 301 connected thereto can only move within a partial range of the window, for example: the two guide rails 702 move within the left half window range and the right half window range respectively, that is: the length of each rail 702 covers a partial range of the window. Of course, the length of each chain 701 may be designed to cover only a portion of the window.
In practical use, under the driving of the rotating motor 601, the winding element 304 rotates around its rotating shaft, so that the chain 701 winds in or out along the outer circumference of the winding element 304, and further drives the shielding block 301 to move along the guide rail 702.
Referring to fig. 8, fig. 8 shows a schematic view of the chain of the blanking member according to an embodiment of the invention. The chain 801 may comprise a plurality of interconnected link plates 802, 803, adjacent link plates being rotatable about an axis of rotation 804 for interconnection. This ensures that the chain 801 can be wound in and out along the outer circumference of the winding element 304.
In some cases, in order to allow the X-rays to pass through a position required by a certain user, in one embodiment of the invention, a through hole may be provided in at least one link plate. Fig. 9 is a schematic structural view of an embodiment of a link plate in a chain. The link plate 901 is provided with a through hole 902 so that X-rays can pass through the through hole.
In order to ensure that the chain is firmly wound around the outer periphery of the winding member 304, in one embodiment of the invention, engaging members having complementary concave-convex shapes may be provided on the outer periphery of the winding member and the link plate, respectively. Referring to fig. 10, fig. 10 is a schematic diagram illustrating the structure of one embodiment of the winding member 304 of the present invention. The winding member 304 may include a shaft 1001, a roller 1002, an engaging member 1003, and a bearing 1004. The roller 1002 is sleeved on a bearing 1004, the roller 1002 can rotate around a rotating shaft 1001, and the meshing part 1003 is positioned on the periphery of the roller and is in a convex shape. In comparison with fig. 8, the shape of the engaging member 1003 is concave-convex complementary to the shape of the concave 805 of the link plate 804 in fig. 8, and the position of the engaging member 1003 corresponds to the position of the concave 805 of the link plate 804 in fig. 8.
A shield for a collimator of a CT machine according to an embodiment of the present invention has been described so far. The shielding piece used on the collimator of the CT machine can shield redundant X rays, so that organ tissues which do not need to be subjected to CT examination are prevented from being radiated by the rays.
referring to FIG. 11, FIG. 11 is a flow chart illustrating one embodiment 1100 of a method of using X-ray shields on a collimator of a CT machine according to the present invention. Method 1100 may comprise steps 1101 to 1103.
In step 1101, information of the effective channels of the detector of the CT machine is determined based on the extent of the scanned region.
When a certain organ of a patient is scanned by CT, which channels on a detector of a CT machine are needed to receive X-rays can be determined according to the specific position and shape of the organ, and the channels used for receiving the CT scanning are called effective channels. In particular, the position of the active channel on the probe and its coverage can be determined.
In step 1102, a mask range for the collimator is calculated from the information.
From the information of the position, coverage and the like of the effective channel determined in step 1101, it can be calculated which positions above the window of the barrier need to be blocked for the barrier in the X-ray blocking piece on the collimator, that is: the range is shielded.
In step 1103, the shield of the collimator is adjusted according to the shielding range.
the shielding range calculated in step 1102 can be converted into the distance that the moving part in the X-ray shielding element needs to move, and then the position of the moving part in the X-ray shielding element can be adjusted electrically or manually, for example: the distance that the moving part needs to move is output to a motor controller, under the control of the motor controller, a motor drives a shielding block and a chain in the moving part, or the motor drives a winding piece in the moving part, so that the purpose of adjusting the position of the shielding block, the chain and the position in the moving part is achieved, and the shielding block and the chain shield the area range needing to shield X rays.
Thus far, a method of using X-ray shields on a collimator of a CT machine according to an embodiment of the invention has been described. The method for using the X-ray shielding piece on the collimator of the CT machine can control the X-ray shielding piece to shield redundant X-rays, so that organ tissues which do not need to be subjected to CT examination are prevented from being irradiated by the X-rays.
the above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (11)
1. An X-ray shield for a collimator of a CT machine, comprising:
The baffle plate is provided with a window; and
A movable member disposed in front of the blocking sheet along an X-ray incidence direction for adjustably blocking the window in a blocking range,
Wherein, the moving part includes:
a shielding block capable of shielding X-rays passing through the window;
a guide rail for guiding the shielding block and defining a movement path and range of the shielding block;
One end of the chain is connected with the shielding block and can shield the X-ray passing through the window; and
A winding member capable of rotating around a shaft so that the chain is wound in or out along an outer circumference thereof.
2. The shield as in claim 1, wherein at least one of the shield block, the guide rail, the chain, and the coil is provided in pairs.
3. The shield of claim 1, wherein the guide track is capable of guiding the shield block and the chain throughout the full range of the window.
4. The shield of claim 1, wherein the guide track is capable of guiding the shield block and the chain for movement within a portion of the window.
5. The shield according to any one of claims 1 to 4, wherein the moving member further comprises a linear motor which drives the shield block to move along the guide rail, wherein the shield block is a linear moving member of the linear motor, and the guide rail is carried by the linear motor.
6. A shield according to any one of claims 1-4, wherein the movable member further comprises a rotary motor for moving the winding member about the axis.
7. The blanking member according to claim 1 wherein said chain comprises a plurality of interconnected link plates, adjacent link plates being rotatable about an axis of rotation for interconnection.
8. A blanking member according to claim 7 wherein the outer periphery of the winding member and the flight are provided with complementary shaped engaging members.
9. The shield according to claim 7, wherein at least one of the link plates is provided with a through hole for allowing X-rays to pass therethrough.
10. A CT machine comprising a shield according to any one of claims 1-9.
11. A method of using an X-ray shield on a collimator of a CT machine, comprising:
Determining the information of an effective channel of a detector of the CT machine according to the range of the scanned part;
calculating a shading range for the collimator from the information; and
Adjusting the X-ray shield according to the shielding range,
Wherein the X-ray shield is according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410082163.9A CN104887259B (en) | 2014-03-07 | 2014-03-07 | X-ray shielding piece for CT (computed tomography) machine collimator, use method of X-ray shielding piece and CT machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410082163.9A CN104887259B (en) | 2014-03-07 | 2014-03-07 | X-ray shielding piece for CT (computed tomography) machine collimator, use method of X-ray shielding piece and CT machine |
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| CN104887259A CN104887259A (en) | 2015-09-09 |
| CN104887259B true CN104887259B (en) | 2019-12-10 |
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| CN106725587A (en) * | 2017-01-25 | 2017-05-31 | 深圳市通用激光科技有限公司 | Ray interval device |
| CN109674488B (en) * | 2019-01-22 | 2024-08-09 | 淇淩智能科技(上海)有限公司 | Portable ray self-protection radiation protection device |
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| CN103561658A (en) * | 2012-05-25 | 2014-02-05 | 株式会社东芝 | X-ray diagnostic device and x-ray diagnostic support method |
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| JP2000005156A (en) * | 1998-06-25 | 2000-01-11 | Hitachi Medical Corp | X-ray device |
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| CN103561658A (en) * | 2012-05-25 | 2014-02-05 | 株式会社东芝 | X-ray diagnostic device and x-ray diagnostic support method |
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