CN111631743A - Front collimator suitable for low-dose radiation of CT (computed tomography) equipment and CT equipment - Google Patents
Front collimator suitable for low-dose radiation of CT (computed tomography) equipment and CT equipment Download PDFInfo
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- CN111631743A CN111631743A CN202010463486.8A CN202010463486A CN111631743A CN 111631743 A CN111631743 A CN 111631743A CN 202010463486 A CN202010463486 A CN 202010463486A CN 111631743 A CN111631743 A CN 111631743A
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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]
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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
- A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
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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
- A61B6/54—Control of apparatus or devices for radiation diagnosis
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
Abstract
The invention provides a pre-collimator suitable for low-dose radiation of CT equipment and the CT equipment, and relates to the technical field of medical equipment, wherein the CT equipment comprises an X-ray tube, the pre-collimator, an inverter, a high-voltage generator, a detector data acquisition system, a linear power supply assembly, a heat exchanger, a counterweight device, a fixed counterweight assembly and a rotating substrate; the front collimator comprises an X-ray collimator frame, an X-ray filtering device, an X-ray filtering driving device, an X-ray collimating driving device and an X-ray shielding device; the front collimator is positioned below the X-ray tube, the integral design is adopted, the X-ray tube filtering device and the X-ray collimating device are simultaneously positioned in the X-ray collimator frame, and the front collimator is convenient to install, disassemble and maintain all components. The X-ray collimation and shielding device can realize the collimation and shielding of the X-ray, ensure the low leakage amount of the X-ray and protect the health of medical personnel.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a front collimator suitable for low-dose radiation of CT equipment and the CT equipment.
Background
The front collimator assembly of the CT device plays a key role in the CT device, the front collimator comprises a filtering device and an X-ray collimating device which are made of absorbing materials and used for weakening and changing spectral components of X-ray radiation, different slits are designed on the front collimator, and the scanning layer thickness of the CT device is controlled by changing the size of the slits; meanwhile, the X-ray shielding device has a shielding effect on X-rays outside the scanning field of view of the CT equipment, and prevents invalid X-rays and stray X-rays from being detected by a detector system, which causes troubles to subsequent data processing.
Patent document CN106611624A discloses a front collimator for CT, which includes a collimator box with a through hole in the center of the box cover, a first arc-shaped guide rail and a second arc-shaped guide rail which are parallel and respectively arranged on the left and right sides of the through hole, and two ends of which are respectively arranged on the front and back of the box cover; a first optical gate plate and a second optical gate plate which are parallel to each other, perpendicular to the first arc-shaped guide rail and the second arc-shaped guide rail respectively and matched with the first arc-shaped guide rail and the second arc-shaped guide rail respectively at two end parts are arranged between the first arc-shaped guide rail and the second arc-shaped guide rail; the first optical shutter plate and the second optical shutter plate are respectively connected to the first motor and the second motor through the transmission mechanism, but the design structure is unreasonable.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a front collimator suitable for use in a CT apparatus for low dose radiation.
The front collimator suitable for low-dose radiation of the CT equipment comprises a front collimator 200, wherein the front collimator 200 comprises an X-ray collimator frame 1, an X-ray filtering device, an X-ray filtering driving device, an X-ray collimating driving device and an X-ray shielding device;
the X-ray shielding device, the X-ray filtering device and the X-ray collimating device are sequentially arranged on the X-ray collimator frame 1 from top to bottom;
the X-ray filtering driving device and the X-ray collimation driving device can drive the X-ray filtering device and the X-ray collimation device to move respectively.
Preferably, the X-ray filtration driving device comprises a filtration device assembly, a filtration device sliding guide rail 2, a first guide shaft supporting seat 3, a first guide shaft 4, a first motor bearing seat 8, a filtration driving motor assembly 11 and a first driving rod 33;
the filtering device sliding guide rail 2 and the first guide shaft 4 are arranged in parallel, the filtering device sliding guide rail 2 is installed on the X-ray collimator frame 1, and the first guide shaft 4 is installed on the X-ray collimator frame 1 through the first guide shaft supporting seat 3;
one end of the filtering device assembly is sleeved on the first driving rod 33, the other end of the filtering device assembly is in sliding fit with the filtering device sliding guide rail 2, one end of the first driving rod 33 is installed on the first motor bearing seat 8, and the other end of the first driving rod 33 is in driving connection with the filtering driving motor assembly 11.
Preferably, the filtering device assembly comprises a first linear bearing 5, a filtering aluminum block 6, a filtering mounting bracket 7, a filtering motor connecting bracket 9, a first photoelectric sensor light shading plate 10, a first guide bearing axial stop plate 17, a front and rear radiation-proof tungsten plate assembly 30 and a left and right radiation-proof tungsten plate assembly 31;
the front and rear radiation-proof tungsten plate assemblies 30 and the left and right radiation-proof tungsten plate assemblies 31 are respectively arranged on the front and rear sides and the left and right sides of the aluminum filter block 6;
the filtering aluminum block 6 and the filtering motor connecting bracket 9 are respectively arranged on the filtering mounting bracket 7;
the first linear bearing 5 is sleeved on the first guide shaft 4 and is arranged inside the aluminum filter block 6, and the first guide bearing axial stop plate 17 is arranged on the aluminum filter block 6 and limits the first linear bearing 5;
the first photoelectric sensor shading plate 10 is arranged on the filtering motor connecting bracket 9.
Preferably, the device also comprises a first photoelectric limit sensor13 and a second photoelectric limit sensor 34;
the first photoelectric limit sensor13 and the second photoelectric limit sensor34 are sequentially arranged on the X-ray collimator frame 1 along the direction of the first driving rod 33;
when the driving motor assembly 11 drives the first driving rod 33 to rotate and drives the filtering motor connecting bracket 9 to move close to the driving motor assembly 11, the first photoelectric sensor light shielding plate 10 is close to the first photoelectric limit sensor13 and receives a limit signal, and then the driving motor assembly 11 stops moving and reaches a first position;
when the driving motor assembly 11 drives the first driving rod 33 to rotate and drives the filter motor connecting bracket 9 to move away from the driving motor assembly 11, the first photoelectric sensor light shielding plate 10 approaches the second photoelectric limit sensor34 and receives the limit signal, and then the driving motor assembly 11 stops moving and reaches the second position.
Preferably, the filter motor further comprises a screw 35 and a filter motor limiting block 25;
the screw 35 is arranged inside the filtering motor connecting bracket 9, and the filtering motor limiting block 25 is arranged on the first driving rod 33;
an internal thread is arranged inside the nut 35, and an external thread is arranged outside the first driving rod 33;
when the first driving rod 33 rotates, the nut 35 is driven to drive the filtered aluminum block 6 to move along the length direction of the first driving rod 33.
Preferably, the X-ray collimating device comprises a mechanical limit block 12, a collimating device sliding guide 14, a slice plate base 15, a slice plate 16, a slice plate guide bracket 20, a second photoelectric sensor light shielding plate 23, a second guide shaft 36, a second linear bearing 37, a second guide shaft supporting seat 38, a third photoelectric limit sensor41 and a fourth photoelectric limit sensor 42;
the slicing plate 16 is arranged on the slicing plate base 15;
one end of the slicing plate base 15 is in sliding fit with a collimating device sliding guide rail 14 arranged on the X-ray collimator frame 1, and the mechanical limiting block 12 is arranged on the collimating device sliding guide rail 14;
the other end of the slicing plate base 15 is provided with a slicing plate guide bracket 20;
a second linear bearing 37 is arranged on the slicing plate guide bracket 20;
the second guide shaft 36 passes through a second linear bearing 37 and is in sliding fit with the second linear bearing 37, and two ends of the second guide shaft 36 are mounted on the X-ray collimator frame 1 through a second guide shaft support seat 38;
the second photoelectric sensor light shading plate 23 is installed on the slicing plate guide support 20, and the third photoelectric limiting sensor41 and the fourth photoelectric limiting sensor42 are sequentially installed on the X-ray collimator frame 1 along the direction parallel to the second guide shaft 36 according to the set distance.
Preferably, the X-ray collimation drive device comprises a slice mounting bracket 18, a collimation drive motor assembly 19, a second motor bearing block 39 and a second drive rod 40;
the second driving rod 40 is arranged between the collimator sliding guide rail 14 and the second guide shaft 36, one end of the second driving rod 40 is mounted on the X-ray collimator frame 1 through a second motor bearing block 39, the other end of the second driving rod 40 passes through the slice mounting bracket 18 and extends to the outside of the X-ray collimator frame 1 to be in driving connection with a collimation driving motor assembly 19 mounted on the X-ray collimator frame 1, and the slice mounting bracket 18 is mounted on the slice plate base 15;
when the alignment driving motor assembly 19 rotates, the second driving rod 40 can be driven to rotate and the slicing mounting bracket 18 can be driven to drive the slicing plate base 15 and the slicing plate 16 to move along the length direction of the second driving rod 40 at the same time.
Preferably, the slicing plate 16 is made of a tungsten alloy material, and a plurality of collimating slits with different sizes are arranged on the slicing plate 16;
the plurality of collimation slits adopt a staggered equidistant arrangement mode of large and small slits and respectively correspond to 4 movement gears in the movement process of the slicing plate 16, wherein the thickness of a CT scanning layer corresponding to a first movement gear is 8 multiplied by 0.625mm, the thickness of a CT scanning layer corresponding to a second gear is 16 multiplied by 0.625mm, the thickness of a CT scanning layer corresponding to a third movement gear is 4 multiplied by 0.625mm, and the thickness of a CT scanning layer corresponding to a fourth movement gear is 32 multiplied by 0.625 mm.
Preferably, the X-ray shielding device comprises a titanium plate 26, a ray shielding tungsten plate assembly-FC 28, a first ray shielding tungsten plate assembly-FS 29 and a second ray shielding tungsten plate assembly-FS 32;
the thickness of the titanium plate 26 is 1 mm, and the material is TA 1;
the X-ray collimator frame 1 is provided with a collimator upper cover plate 22 and mounting lugs, and the titanium plate 26 is arranged between the X-ray filtering device and the collimator upper cover plate 22 and mounted on the collimator upper cover plate 22;
a first ray protection tungsten plate assembly-FS 29, a ray protection tungsten plate assembly-FC 28 and a second ray protection tungsten plate assembly-FS 32 are sequentially arranged on one side, close to the filtering driving motor assembly 11, of the X-ray collimator frame 1.
The CT apparatus provided by the present invention comprises the front collimator 200, and further comprises an X-ray tube 100, an inverter 300, a high voltage generator 400, a detector data acquisition system 500, a linear power supply assembly 600, a heat exchanger 700, a counterweight device, a fixed counterweight assembly 1000, and a rotating base plate 1100;
a front collimator 200, an inverter 300, a high voltage generator 400, a detector data acquisition system 500, a linear power supply assembly 600 and a heat exchanger 700 are sequentially arranged along the circumferential direction of the rotating substrate 1100;
the X-ray tube 100 is mounted on the side of the front collimator 200 remote from the rotating substrate 1100;
the counterweight device comprises a left adjusting counterweight assembly 800 and a right adjusting counterweight assembly 900;
the left adjusting counterweight assembly 800, the fixed counterweight assembly 1000 and the right adjusting counterweight assembly 900 are sequentially arranged on one side of the detector data acquisition system 500 away from the rotating base plate 1100;
an X-ray light outlet tungsten plate 44, a first lead block 45 and a second lead block 46 are further installed between the X-ray tube 100 and the front collimator 200, and the X-ray light outlet tungsten plate 44, the first lead block 45 and the second lead block 46 are all installed outside the X-ray collimator frame 1;
the first lead block 45 and the second lead block 46 can be seamlessly spliced or separated from each other.
Compared with the prior art, the invention has the following beneficial effects:
1. the X-ray path can realize the collimation and the shielding of the X-ray, and ensure the low leakage amount of the X-ray, thereby ensuring that a patient receives lower radiation dose when receiving the scanning of CT equipment and protecting the health of medical personnel.
2. According to the invention, the X-ray tube and the front collimator are connected through the mounting pin and the shaft shoulder screw, and the mounting precision of the front collimator is ensured by the matching use of the stepped pin and the shaft shoulder screw, so that the verticality between the X-ray filtering driving device and the X-ray collimation driving device and the X-ray light plane is improved, and the reliable mechanical mounting precision is provided for subsequent algorithm correction.
3. The mechanical structure of the front collimator is integrally designed, so that the front collimator is more convenient and quicker to assemble and disassemble, and the serviceability and the operability are improved.
4. The X-ray collimation driving device and the stepping motor of the X-ray filtration driving device adopt a design scheme of integrating a screw rod and a motor shaft, so that the position precision between the motor shaft and the screw rod is effectively ensured, meanwhile, an encoder arranged at the shaft end of the motor can timely record the position in the movement process and feed back the position information to the control system, and the positions of the X-ray filtration device and the X-ray collimation device can be rapidly switched through the control system to adapt to different scanning protocol parameters.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic top view of a front collimator;
FIG. 2 is a schematic side view of a front collimator;
FIG. 3 is a schematic structural view of a front and rear radiation-proof tungsten plate assembly and a left and right radiation-proof tungsten plate assembly;
FIG. 4 is a schematic structural diagram of a CT apparatus;
FIG. 5 is a schematic view of the arrangement of the tungsten plate, the first lead block and the second lead block.
The figures show that:
front and rear radiation-proof tungsten plate assembly 30 of X-ray collimator frame 1
Left and right radiation-proof tungsten plate assembly 31 of filter device sliding guide rail 2
First guide shaft supporting seat 3 and second ray protection tungsten plate assembly-FS 32
First guide shaft 4 first drive lever 33
First linear bearing 5 second photoelectric limit sensor34
6 screw nuts 35 of filter aluminum block
First motor bearing support 8 and second linear bearing 37
Second guide shaft supporting seat 38 of filter motor connecting bracket 9
First photoelectric sensor light screen 10 second motor bearing seat 39
Third photoelectric limiting sensor41 of mechanical limiting block 12
First photoelectric Limit sensor13 fourth photoelectric Limit sensor42
Second guide bearing stop plate 43 of collimator slide rail 14
First lead block 45 of slicing plate 16
First guide bearing axial stop plate 17 second lead block 46
Slice mounting bracket 18X-ray tube 100
Collimator lower cover plate 21 high pressure generator 400
Collimator upper cover plate 22 detector data acquisition system 500
Second opto-electronic sensor shutter 23 Linear Power Module 600
Ray protection tungsten plate assembly-FC 28 rotating baseplate 1100
First ray-shielding tungsten plate assembly-FS 29
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The present invention provides a CT apparatus, as shown in fig. 4, comprising an X-ray tube 100, a front collimator 200, an inverter 300, a high voltage generator 400, a detector data acquisition system 500, a linear power supply assembly 600, a heat exchanger 700, a counterweight device, a fixed counterweight assembly 1000, and a rotating base plate 1100; a front collimator 200, an inverter 300, a high-voltage generator 400, a detector data acquisition system 500, a linear power supply assembly 600 and a heat exchanger 700 are sequentially mounted along the circumferential direction of the rotating substrate 1100, and the rotating substrate 1100 is preferably of a tubular structure; the X-ray tube 100 is mounted on the side of the front collimator 200 remote from the rotating substrate 1100; the counterweight device comprises a left adjusting counterweight assembly 800 and a right adjusting counterweight assembly 900; the left adjusting counterweight assembly 800, the fixed counterweight assembly 1000 and the right adjusting counterweight assembly 900 are sequentially arranged on one side of the detector data acquisition system 500 away from the rotating base plate 1100; specifically, the front collimator 200 is located below the X-ray tube 100 of the CT apparatus, and the X-ray tube filtering device and the X-ray collimating device are located in the X-ray collimator frame 1 at the same time by using an integrated design scheme, so that the installation and subsequent disassembly maintenance of each component of the front collimator 200 are facilitated. The X-ray path can realize the collimation and the shielding of the X-ray, and ensure the low leakage amount of the X-ray, thereby ensuring that a patient receives lower radiation dose when receiving the scanning of CT equipment and protecting the health of medical personnel.
Specifically, as shown in fig. 4, the X-ray tube 100 and the front collimator 200 are connected by mounting pins and shoulder screws, and the mounting accuracy of the front collimator 200 is ensured by the cooperation of stepped pins and shoulder screws, so that the perpendicularity between the X-ray filtering driving device and the X-ray collimating driving device and the X-ray light plane is improved, and the reliable mechanical mounting accuracy is provided for subsequent algorithm correction.
Further, the present invention also provides a front collimator suitable for low-dose radiation of CT equipment, as shown in fig. 1 and fig. 2, the front collimator 200 includes an X-ray collimator frame 1, an X-ray filtering device, an X-ray filtering driving device, an X-ray collimating driving device, and an X-ray shielding device; the X-ray shielding device, the X-ray filtering device and the X-ray collimating device are sequentially arranged on the X-ray collimator frame 1 from top to bottom, and preferably, the X-ray shielding device, the X-ray filtering device and the X-ray collimating device are respectively arranged on the X-ray collimator frame 1 through screws; the X-ray filtering driving device and the X-ray collimation driving device can drive the X-ray filtering device and the X-ray collimation device to move respectively. The mechanical structure of the front collimator 200 is integrated, so that the assembly and disassembly are more convenient and faster, and the serviceability and operability are improved.
Specifically, the X-ray collimator frame 1 plays a supporting role, is made of an aluminum alloy material by adopting a machining mode after casting, and ensures the installation accuracy of the relative positions among the motor installation shaft, the installation guide rail of the driving device and the guide shaft, thereby ensuring the reliability of the installation position accuracy of the X-ray filtering device and the X-ray collimating device.
Specifically, as shown in fig. 1 and fig. 2, the X-ray filtration driving device includes a filtration device assembly, a filtration device sliding guide rail 2, a first guide shaft support base 3, a first guide shaft 4, a first motor bearing base 8, a filtration driving motor assembly 11, and a first driving rod 33; the filtering device sliding guide rail 2 and the first guide shaft 4 are arranged in parallel, the filtering device sliding guide rail 2 is installed on the X-ray collimator frame 1, and the first guide shaft 4 is installed on the X-ray collimator frame 1 through the first guide shaft supporting seat 3; one end of the filtering device assembly is sleeved on the first driving rod 33, the other end of the filtering device assembly is in sliding fit with the filtering device sliding guide rail 2, one end of the first driving rod 33 is installed on the first motor bearing seat 8, the first motor bearing seat 8 is installed on the X-ray collimator frame 1 through a screw, and the other end of the first driving rod 33 is in driving connection with the filtering driving motor assembly 11.
Specifically, as shown in fig. 1, 2 and 3, the filter assembly includes a first linear bearing 5, a filter aluminum block 6, a filter mounting bracket 7, a filter motor connecting bracket 9, a first photoelectric sensor light shielding plate 10, a first guide bearing axial stop plate 17, a front and rear radiation-proof tungsten plate assembly 30 and a left and right radiation-proof tungsten plate assembly 31; the front and rear radiation-proof tungsten plate assemblies 30 and the left and right radiation-proof tungsten plate assemblies 31 are respectively installed on the front and rear sides and the left and right sides of the aluminum filter block 6 through screws, so that invalid X rays and scattered rays of the X rays in a collimation path can be shielded, and stray rays are prevented from leaking out of the collimator; the filtering aluminum block 6 and the filtering motor connecting bracket 9 are respectively arranged on the filtering mounting bracket 7 through screws; the aluminum block 6, the filter mounting bracket 7 and the filter motor connecting bracket 9 are positioned by pins, so that reliable mounting accuracy is guaranteed, and the three are fastened by screws.
Further, the first linear bearing 5 is sleeved on the first guide shaft 4 and is installed inside the aluminum filter block 6, the first guide bearing axial stop plate 17 is installed on the aluminum filter block 6 and limits the first linear bearing 5, the first guide bearing axial stop plate 17 is attached to the end face of the first linear bearing 5, the first guide bearing axial stop plate 17 is fixed to the aluminum filter block 6 through mounting screws, and the first linear bearing 5 is guaranteed not to move in the axial direction in the movement process of the filter device assembly.
Specifically, as shown in fig. 1 and fig. 2, the sensor further includes a first photoelectric limit sensor13 and a second photoelectric limit sensor 34; the first photoelectric limit sensor13 and the second photoelectric limit sensor34 are sequentially arranged on the X-ray collimator frame 1 along the direction of the first driving rod 33; the first photoelectric sensor shading plate 10 is arranged on the filtering motor connecting bracket 9; when the driving motor assembly 11 drives the first driving rod 33 to rotate and drives the filtering motor connecting bracket 9 to move close to the driving motor assembly 11, the first photoelectric sensor light shielding plate 10 is close to the first photoelectric limit sensor13 and receives a limit signal, and then the driving motor assembly 11 stops moving and reaches a first position; when the driving motor assembly 11 drives the first driving rod 33 to rotate and drives the filtering motor connecting bracket 9 to move away from the driving motor assembly 11, the first photoelectric sensor light shielding plate 10 is close to the second photoelectric limit sensor34 and receives a limit signal, and then the driving motor assembly 11 stops moving and reaches the second position; meanwhile, in the operation process of the collimating device assembly, the position of the aluminum filter block 6 is required to be passed, so that data collected by an algorithm can be conveniently corrected by the algorithm.
In a preferred embodiment, the filter assembly has three movement gears during movement, and the first movement gear is an initial movement position and is located at a zero position of the first photoelectric limiting sensor13, namely a first position; a second motion range between the first photoelectric limit sensor13 and the second photoelectric limit sensor 34; in the third movement range, the filter assembly moves out of the scanning field of view, namely the second position, and the filter assembly does not appear in the scanning field of view during normal scanning of the device.
Specifically, as shown in fig. 1 and 2, the filter motor further includes a screw 35 and a filter motor limiting block 25; the screw 35 is arranged inside the filtering motor connecting bracket 9, and the filtering motor limiting block 25 is arranged on the first driving rod 33; an internal thread is arranged inside the nut 35, and an external thread is arranged outside the first driving rod 33; when the first driving rod 33 rotates, the screw 35 is driven to drive the filter motor connecting bracket 9 and the filter aluminum block 6 to move along the length direction of the first driving rod 33.
Specifically, as shown in fig. 1 and fig. 2, the X-ray collimating device includes a mechanical stopper 12, a collimating device sliding guide 14, a slice plate base 15, a slice plate 16, a slice plate guide bracket 20, a second photoelectric sensor light shielding plate 23, a second guide shaft 36, a second linear bearing 37, a second guide shaft support seat 38, a third photoelectric sensor41, and a fourth photoelectric sensor 42; slicing plate 16 is installed on slicing plate base 15, wherein, locks slicing plate 16 to slicing plate base 15 with mounting screw on, guarantees that the right-angle side of slicing plate 16 and the right-angle location limit of slicing plate base 15 align, makes things convenient for the installation location of slicing plate 16.
Further, as shown in fig. 1 and fig. 2, one end of the slice plate base 15 is in sliding fit with a collimator sliding guide rail 14 installed on the X-ray collimator frame 1, the mechanical limit blocks 12 are installed on the collimator sliding guide rail 14, in a preferred example, the number of the mechanical limit blocks 12 is two, and the two mechanical limit blocks 12 are respectively installed at two ends of the collimator sliding guide rail 14, so as to respectively limit the movement of the slice plate base 15; the other end of the slicing plate base 15 is provided with a slicing plate guide bracket 20; a second linear bearing 37 is arranged on the slicing plate guide bracket 20; the second guide shaft 36 passes through a second linear bearing 37 and is in sliding fit with the second linear bearing 37, and two ends of the second guide shaft 36 are mounted on the X-ray collimator frame 1 through a second guide shaft support seat 38; second photoelectric sensor light screen 23 is installed on slicer guide bracket 20, the spacing sensor41 of third photoelectricity, the spacing sensor42 of fourth photoelectricity are installed on X ray collimator frame 1 in proper order along the direction that parallels with second guiding axle 36 according to the interval of setting for, when slicer base 15 moves along the direction of second guiding axle 36 length, can respond to third photoelectric spacing sensor41, the spacing sensor42 of fourth photoelectricity through installing the second photoelectric sensor light screen 23 on slicer guide bracket 20, thereby control the stroke of slicer base 15, and then realize the control of 16 strokes of slicer.
Specifically, as shown in fig. 1 and fig. 2, the X-ray collimation driving device includes a slice mounting bracket 18, a collimation driving motor assembly 19, a second motor bearing block 39 and a second driving rod 40; the second driving rod 40 is arranged between the collimator sliding guide rail 14 and the second guide shaft 36, one end of the second driving rod 40 is mounted on the X-ray collimator frame 1 through a second motor bearing seat 39, the other end of the second driving rod 40 passes through the slice mounting bracket 18 and extends to the outside of the X-ray collimator frame 1 to be in driving connection with a collimation driving motor assembly 19 mounted on the X-ray collimator frame 1, the slice mounting bracket 18 is mounted on the slice plate base 15, in a preferred embodiment, the slice mounting bracket 18 is mounted on the slice plate base 15 through a step pin 27, and the step pin 27 is knocked into a pin hole on the slice mounting bracket 18 by a copper rod during mounting; the slice mounting bracket 18 is provided with a second guide bearing stop plate 43 by a screw, which can prevent the second linear bearing 37 from moving in the axial direction.
Further, when the alignment driving motor assembly 19 rotates, the second driving rod 40 can be driven to rotate, the slicing mounting bracket 18 can be driven to drive the slicing plate base 15 and the slicing plate 16 to simultaneously move along the length direction of the second driving rod 40, and in a preferred embodiment, the alignment driving motor assembly 19 is further provided with an alignment motor limiting block 24.
Further, the collimation drive motor assembly 19 includes a stepping motor and an encoder, the encoder is mounted on the stepping motor; the stepping motor is provided with a motor shaft, and the motor shaft is welded with the second driving rod 40; the stepping motors of the X-ray collimation driving device and the X-ray filtration driving device adopt a design scheme of integrating a screw rod and a motor shaft, so that the position precision between the motor shaft and the screw rod is effectively guaranteed, meanwhile, an encoder arranged at the end of the motor shaft can timely record the position in the movement process and feed back the position information to the control system, and the positions of the X-ray filtration device and the X-ray collimation device can be rapidly switched through the control system to adapt to different scanning protocol parameters.
During specific installation, a screw nut of the collimating motor and the slicing plate guide support 20 are adjusted to proper positions, the slicing plate 16 is installed on the slicing plate base 15 through screws, the slicing plate base 15 is locked together with the collimating device sliding guide rail 14, the slicing installation support 18 and the slicing plate guide support 20, a pin installation hole in the slicing plate base 15 and a positioning pin installed on the slicing plate guide support 20 are ensured to be well aligned during installation, and the position installation positioning precision of the slicing plate is ensured; the nut of the collimation motor and the slice mounting bracket 18 are fixed together through mounting screws; then the second motor bearing seat 39 is fixed on the upper surface 1 of the X-ray collimator frame through a mounting screw; the collimation drive motor assembly 19 and the slice mounting bracket 18 are jointly mounted and fixed on the X-ray collimator frame 1 through mounting screws, and meanwhile, the shaft end of the collimation drive motor assembly 19 can smoothly pass through the second motor bearing seat 39, and the second motor bearing seat 39 is locked on the X-ray collimator frame 1 through the mounting screws.
Specifically, as shown in fig. 1 and 2, the slicing plate 16 is made of a tungsten alloy material, and a plurality of collimation slits with different sizes are arranged on the slicing plate 16 and respectively correspond to different scanning layer thicknesses of the CT apparatus; a plurality of collimation slits adopt the crisscross equidistance arrangement mode of size slit and correspond a plurality of motion gears in the 16 motion processes of slide plate respectively, have guaranteed the homogeneity of size between slit edge and the edge, have improved X ray's sheltering from and shielding efficiency and the good effect to the sheltering from of stray ray.
Further, the number of the collimating slits is preferably 4, the number of the motion steps is preferably 4, wherein the CT scanning layer thickness corresponding to the first motion step is 8 × 0.625mm, the CT scanning layer thickness corresponding to the second motion step is 16 × 0.625mm, the CT scanning layer thickness corresponding to the third motion step is 4 × 0.625mm, and the CT scanning layer thickness corresponding to the fourth motion step is 32 × 0.625 mm.
Furthermore, the third photoelectric limit sensor41 and the fourth photoelectric limit sensor42 are installed on the X-ray collimator frame 1 through screws according to a set distance, the third photoelectric limit sensor41 and the fourth photoelectric limit sensor42 are respectively located at a zero position and an end point electric limit position of the slice plate 16, and when the slice plate 16 moves to the zero position, the slice plate 16 is located at a position without a slit, and the slit of the collimator lower cover plate 21 is shielded at the position, so that a scanning patient is prevented from receiving excessive radiation dose under the condition that X-rays are misplaced due to out-of-control CT device software.
Specifically, as shown in fig. 1 and 2, the X-ray shielding device includes a titanium plate 26, a radiation shielding tungsten plate assembly-FC 28, a first radiation shielding tungsten plate assembly-FS 29, and a second radiation shielding tungsten plate assembly-FS 32; the titanium plate 26 is 1 mm thick and adopts TA1 material, and is used for weakening and changing the X-ray radiation spectrum; the X-ray collimator frame 1 is provided with a collimator upper cover plate 22 and mounting lugs, the titanium plate 26 is arranged between the X-ray filtering device and the collimator upper cover plate 22 and mounted on the collimator upper cover plate 22, the titanium plate 26 is positioned above the X-ray filtering driving device and below the collimator upper cover plate, and the collimator upper cover plate 22 and the titanium plate 26 are assembled on the collimator frame 1 together through mounting screws; a first ray protection tungsten plate component-FS 29, a ray protection tungsten plate component-FC 28 and a second ray protection tungsten plate component-FS 32 are sequentially arranged on one side, close to the filtering driving motor component 11, of the X-ray collimator frame 1, the three tungsten plate components ensure that the collimation effect of X rays in the whole passage process is optimal, meanwhile, the effective shielding effect on invalid X rays and stray rays on the whole X-ray passage is ensured, and the radiation leakage amount of the X rays is reduced; in a preferred embodiment, the whole X-ray shielding device further comprises X-ray shielding tungsten plates for preventing radiation leakage, which are installed on the front and rear sides of the X-ray collimator frame 1.
Further, as shown in fig. 2, the collimator lower cover plate 21 also needs to be fixed to the collimator frame 1 by mounting screws.
Specifically, the X-ray shielding device further comprises an X-ray light outlet tungsten plate 44 installed below a light outlet of the X-ray tube 100 and two lead blocks above an X-ray passage, the two lead blocks are installed to ensure good connection, and the lead blocks can be spliced together without a gap, in a preferred embodiment, as shown in fig. 5, an X-ray light outlet tungsten plate 44, a first lead block 45 and a second lead block 46 are further installed between the X-ray tube 100 and the front collimator 200, the X-ray light outlet tungsten plate 44, the first lead block 45 and the second lead block 46 are all installed outside the X-ray collimator frame 1, and the first lead block 45 and the second lead block 46 can be spliced together or separated from each other without a gap.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The front collimator suitable for low-dose radiation of a CT device is characterized by comprising a front collimator (200), wherein the front collimator (200) comprises an X-ray collimator frame (1), an X-ray filtering device, an X-ray filtering driving device, an X-ray collimating driving device and an X-ray shielding device;
the X-ray shielding device, the X-ray filtering device and the X-ray collimating device are sequentially arranged on the X-ray collimator frame (1) from top to bottom;
the X-ray filtering driving device and the X-ray collimation driving device can drive the X-ray filtering device and the X-ray collimation device to move respectively.
2. The front collimator suitable for CT equipment low-dose radiation is characterized in that the X-ray filtration driving device comprises a filtration device assembly, a filtration device sliding guide rail (2), a first guide shaft supporting seat (3), a first guide shaft (4), a first motor bearing seat (8), a filtration driving motor assembly (11) and a first driving rod (33);
the filtering device sliding guide rail (2) and the first guide shaft (4) are arranged in parallel, the filtering device sliding guide rail (2) is installed on the X-ray collimator frame (1), and the first guide shaft (4) is installed on the X-ray collimator frame (1) through the first guide shaft supporting seat (3);
one end of the filtering device assembly is sleeved on the first driving rod (33), the other end of the filtering device assembly is in sliding fit with the filtering device sliding guide rail (2), one end of the first driving rod (33) is installed on the first motor bearing seat (8), and the other end of the first driving rod (33) is in driving connection with the filtering driving motor assembly (11).
3. The front collimator suitable for CT apparatus low-dose radiation as claimed in claim 2, wherein the filter assembly comprises a first linear bearing (5), a filter aluminum block (6), a filter mounting bracket (7), a filter motor connecting bracket (9), a first photoelectric sensor light shielding plate (10), a first guide bearing axial stop plate (17), a front and rear radiation-proof tungsten plate assembly (30) and a left and right radiation-proof tungsten plate assembly (31);
the front and rear radiation-proof tungsten plate assemblies (30) and the left and right radiation-proof tungsten plate assemblies (31) are respectively arranged on the front and rear sides and the left and right sides of the aluminum filtering block (6);
the filtering aluminum block (6) and the filtering motor connecting bracket (9) are respectively arranged on the filtering mounting bracket (7);
the first linear bearing (5) is sleeved on the first guide shaft (4) and is installed inside the filtering aluminum block (6), and the first guide bearing axial stop plate (17) is installed on the filtering aluminum block (6) and limits the first linear bearing (5);
the first photoelectric sensor shading plate (10) is arranged on the filtering motor connecting support (9).
4. The front collimator suitable for low-dose radiation of CT equipment as claimed in claim 3, further comprising a first photoelectric limit sensor (13) and a second photoelectric limit sensor (34);
the first photoelectric limiting sensor (13) and the second photoelectric limiting sensor (34) are sequentially arranged on the X-ray collimator frame (1) along the direction of the first driving rod (33);
when the driving motor assembly (11) drives the first driving rod (33) to rotate and drives the filtering motor connecting support (9) to move close to the driving motor assembly (11), the first photoelectric sensor light shielding plate (10) is close to the first photoelectric limiting sensor (13) and receives a limiting signal, and then the driving motor assembly (11) stops moving and reaches a first position;
when the driving motor assembly (11) drives the first driving rod (33) to rotate and drives the filtering motor connecting support (9) to move away from the driving motor assembly (11), the first photoelectric sensor light shielding plate (10) is close to the second photoelectric limiting sensor (34) and receives a limiting signal, and then the driving motor assembly (11) stops moving and reaches the second position.
5. The front collimator suitable for CT equipment low-dose radiation as claimed in claim 3, further comprising a screw nut (35) and a filter motor stopper (25);
the screw nut (35) is arranged inside the filtering motor connecting support (9), and the filtering motor limiting block (25) is arranged on the first driving rod (33);
an internal thread is arranged inside the nut (35), and an external thread is arranged outside the first driving rod (33);
when the first driving rod (33) rotates, the screw nut (35) is driven to drive the aluminum filter block (6) to move along the length direction of the first driving rod (33).
6. The front collimator suitable for CT apparatus low-dose radiation, according to claim 1, characterized in that the X-ray collimating device comprises a mechanical stopper (12), a collimating device sliding guide rail (14), a slice plate base (15), a slice plate (16), a slice plate guide bracket (20), a second photoelectric sensor light shield (23), a second guide shaft (36), a second linear bearing (37), a second guide shaft support base (38), a third photoelectric sensor (41) and a fourth photoelectric sensor (42);
the slicing plate (16) is arranged on the slicing plate base (15);
one end of the slicing plate base (15) is in sliding fit with a collimating device sliding guide rail (14) arranged on the X-ray collimator frame (1), and the mechanical limiting block (12) is arranged on the collimating device sliding guide rail (14);
the other end of the slicing plate base (15) is provided with a slicing plate guide bracket (20);
a second linear bearing (37) is arranged on the slicing plate guide bracket (20);
the second guide shaft (36) penetrates through the second linear bearing (37) and is in sliding fit with the second linear bearing (37), and two ends of the second guide shaft (36) are mounted on the X-ray collimator frame (1) through a second guide shaft supporting seat (38);
the second photoelectric sensor light shielding plate (23) is installed on the slicing plate guide support (20), and the third photoelectric limiting sensor (41) and the fourth photoelectric limiting sensor (42) are sequentially installed on the X-ray collimator frame (1) along the direction parallel to the second guide shaft (36) according to the set distance.
7. The front collimator suitable for CT equipment low-dose radiation is characterized in that the X-ray collimation driving device comprises a slice mounting bracket (18), a collimation driving motor assembly (19), a second motor bearing seat (39) and a second driving rod (40);
the second driving rod (40) is arranged between the collimating device sliding guide rail (14) and the second guide shaft (36), one end of the second driving rod (40) is installed on the X-ray collimator frame (1) through a second motor bearing seat (39), the other end of the second driving rod (40) penetrates through the slice mounting support (18) and extends to the outside of the X-ray collimator frame (1) to be in driving connection with a collimation driving motor assembly (19) installed on the X-ray collimator frame (1), and the slice mounting support (18) is installed on the slice plate base (15);
when the collimation driving motor component (19) rotates, the second driving rod (40) can be driven to rotate, and the slicing mounting support (18) is driven to drive the slicing plate base (15) and the slicing plate (16) to move along the length direction of the second driving rod (40) simultaneously.
8. The front collimator suitable for CT equipment low-dose radiation is characterized in that the slicing plate (16) is made of tungsten alloy, and a plurality of collimation slits with different sizes are arranged on the slicing plate (16);
the plurality of collimation slits adopt a staggered equidistant arrangement mode of large slits and small slits and respectively correspond to 4 movement gears in the movement process of the slicing plate (16), wherein the thickness of a CT scanning layer corresponding to a first movement gear is 8 multiplied by 0.625mm, the thickness of a CT scanning layer corresponding to a second gear is 16 multiplied by 0.625mm, the thickness of a CT scanning layer corresponding to a third movement gear is 4 multiplied by 0.625mm, and the thickness of a CT scanning layer corresponding to a fourth movement gear is 32 multiplied by 0.625 mm.
9. The front collimator suitable for low-dose radiation of CT equipment according to claim 2, characterized in that the X-ray shielding device comprises a titanium plate (26), a radiation-shielding tungsten plate assembly-FC (28), a first radiation-shielding tungsten plate assembly-FS (29) and a second radiation-shielding tungsten plate assembly-FS (32);
the thickness of the titanium plate (26) is 1 mm, and the material is TA 1;
the X-ray collimator frame (1) is provided with a collimator upper cover plate (22) and a mounting lug, and the titanium plate (26) is arranged between the X-ray filtering device and the collimator upper cover plate (22) and mounted on the collimator upper cover plate (22);
a first ray protection tungsten plate assembly-FS (29), a ray protection tungsten plate assembly-FC (28) and a second ray protection tungsten plate assembly-FS (32) are sequentially mounted on one side, close to the filtering driving motor assembly (11), of the X-ray collimator frame (1).
10. A CT device comprising a front collimator (200) according to any of claims 1 to 9, further comprising an X-ray tube (100), an inverter (300), a high voltage generator (400), a detector data acquisition system (500), a linear power supply assembly (600), a heat exchanger (700), a counterweight arrangement, a fixed counterweight assembly (1000) and a rotating base plate (1100);
a front collimator (200), an inverter (300), a high-voltage generator (400), a detector data acquisition system (500), a linear power supply assembly (600) and a heat exchanger (700) are sequentially arranged along the circumferential direction of the rotary substrate (1100);
the X-ray tube (100) is mounted on the side of the front collimator (200) away from the rotating substrate (1100);
the counterweight device comprises a left adjusting counterweight component (800) and a right adjusting counterweight component (900);
the left adjusting counterweight component (800), the fixed counterweight component (1000) and the right adjusting counterweight component (900) are sequentially arranged on one side, far away from the rotating base plate (1100), of the detector data acquisition system (500);
an X-ray light-emitting opening tungsten plate (44), a first lead block (45) and a second lead block (46) are further arranged between the X-ray tube (100) and the front collimator (200), and the X-ray light-emitting opening tungsten plate (44), the first lead block (45) and the second lead block (46) are all arranged outside the X-ray collimator frame (1);
the first lead block (45) and the second lead block (46) can be seamlessly spliced or separated from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010463486.8A CN111631743A (en) | 2020-05-27 | 2020-05-27 | Front collimator suitable for low-dose radiation of CT (computed tomography) equipment and CT equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010463486.8A CN111631743A (en) | 2020-05-27 | 2020-05-27 | Front collimator suitable for low-dose radiation of CT (computed tomography) equipment and CT equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111631743A true CN111631743A (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010463486.8A Withdrawn CN111631743A (en) | 2020-05-27 | 2020-05-27 | Front collimator suitable for low-dose radiation of CT (computed tomography) equipment and CT equipment |
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| Country | Link |
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| CN (1) | CN111631743A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112890845A (en) * | 2021-03-31 | 2021-06-04 | 武汉联影生命科学仪器有限公司 | CT collimating device and CT equipment with same |
| US20210345978A1 (en) * | 2018-12-27 | 2021-11-11 | Medtronic Navigation, Inc. | System and method for imaging a subject |
| US11771391B2 (en) | 2018-12-27 | 2023-10-03 | Medtronic Navigation, Inc. | System and method for imaging a subject |
-
2020
- 2020-05-27 CN CN202010463486.8A patent/CN111631743A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210345978A1 (en) * | 2018-12-27 | 2021-11-11 | Medtronic Navigation, Inc. | System and method for imaging a subject |
| US11771391B2 (en) | 2018-12-27 | 2023-10-03 | Medtronic Navigation, Inc. | System and method for imaging a subject |
| CN112890845A (en) * | 2021-03-31 | 2021-06-04 | 武汉联影生命科学仪器有限公司 | CT collimating device and CT equipment with same |
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