CN114822905A - Novel variable FOV high-precision CT collimator and use method - Google Patents
Novel variable FOV high-precision CT collimator and use method Download PDFInfo
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- CN114822905A CN114822905A CN202210422469.9A CN202210422469A CN114822905A CN 114822905 A CN114822905 A CN 114822905A CN 202210422469 A CN202210422469 A CN 202210422469A CN 114822905 A CN114822905 A CN 114822905A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims abstract description 64
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
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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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- 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 or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/06—Diaphragms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/545—Control of apparatus or devices for radiation diagnosis involving automatic set-up of acquisition parameters
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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
- G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
- G21K1/046—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers varying the contour of the field, e.g. multileaf collimators
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Abstract
The invention discloses a novel variable FOV high-precision CT collimator which comprises an installation bottom plate, an X-axis linear motor stator and a grating, a Z-axis linear motor stator and a grating, an X-axis guide rail, an X-axis left side light blocking assembly, an X-axis right side light blocking assembly, a Z-axis guide rail, a Z-axis front side light blocking assembly, a Z-axis rear side light blocking assembly, an automatic exposure control assembly and a wave state filtering assembly. The technical scheme is adopted to manufacture the novel variable FOV high-precision CT collimator with bidirectional adjustment and improved precision. The inventive method for using the linear motor and the grating feedback maximally reduces the complexity of a mechanical structure, the running speed of the linear motor can be adjusted according to actual requirements, the grating can perform real-time position feedback, and the precision reaches 5 mu m. The high-precision linear guide rail is used, so that the X-axis and the Y-axis can run more smoothly, and the phenomenon of blockage or blockage does not exist.
Description
Technical Field
The invention relates to the field of CT collimators, in particular to a novel variable FOV high-precision CT collimator and a using method thereof.
Background
The collimator is a precision device installed on the bulb tube, and plays a key role in the quality of CT images as an adjustable X-ray device which can limit the scanning space range and the radiation dose. At present, the common CT collimator on the market has no function of adjusting FOV basically, can only adjust Z-axis, and cannot adjust different radiation areas for patients or children with different fat and thin. The FOV divided by the matrix size equals the voxel, with a smaller FOV yielding a sharper image under the same matrix. (FOV is the field of View angle)
The domestic patent CN201920348978.5, a CT variable FOV collimator, finds its design defect in that the position of the FOV light blocking assembly cannot be subjected to real-time feedback motion with low precision. The X-axis guide device is not provided with high-precision guide components such as a linear guide rail or a guide column, and the movement process can have the phenomena of unsmooth movement, blockage and even dead blockage. The rack-and-pinion type connection mode and the absence of a high-precision guide device can cause the phenomenon that the distance from the center of a pinion to the center of a rack floats up and down in the operation process, the FOV of an X axis cannot reach an expected position, and the phenomenon that the FOV shakes to generate noise in the operation process can also occur. The FOV in the X-axis direction can be adjusted only, and the field size in the Z-axis direction cannot be adjusted. The defects that the X-ray dosage cannot be fed back in real time and the like exist because an automatic exposure control assembly is not arranged.
Therefore, a new variable FOV high precision CT collimator with bidirectional adjustment and improved precision and a method of use thereof are needed.
Disclosure of Invention
In order to solve the problems, the invention provides a novel variable FOV high-precision CT collimator with bidirectional adjustment and improved precision and a using method thereof.
The invention relates to a novel variable FOV high-precision CT collimator, which comprises an installation bottom plate, an X-axis linear motor stator and a grating, a Z-axis linear motor stator and a grating, an X-axis guide rail, an X-axis left side light blocking component, an X-axis right side light blocking component, a Z-axis guide rail, a Z-axis front side light blocking component, a Z-axis rear side light blocking component, an automatic exposure control component and a wave state filtering component, wherein the X-axis linear motor stator and the grating, the Z-axis linear motor stator and the grating are arranged on the installation bottom plate, the X-axis linear motor stator and the grating are provided with the X-axis guide rail, the X-axis guide rail is provided with the X-axis left side light blocking component and the X-axis right side light blocking component, the Z-axis linear motor stator and the grating are provided with the Z-axis guide rail, the Z-axis front side light blocking component and the Z-axis rear side light blocking component are arranged on the Z-axis guide rail, the automatic exposure control component is also arranged on the installation bottom plate, the automatic exposure control assembly is connected with the wave state filtering assembly.
In the above scheme, the light blocking assembly on the left side of the X axis comprises a first slider, a first rotor and a first light blocking plate, the first slider and the first rotor are arranged on the guide rail of the X axis, and the first light blocking plate is arranged on the first slider and the first rotor.
In the above scheme, the light blocking assembly on the right side of the X axis comprises a second slider, a second rotor and a second light blocking plate, the second slider and the second rotor are arranged on the X axis guide rail, and the second light blocking plate is arranged on the second slider and the second rotor.
In the above scheme, the light blocking assembly on the front side of the Z axis comprises a third slider, a third rotor and a third light blocking plate, the third slider and the third rotor are arranged on the Z axis guide rail, and the third light blocking plate is arranged on the third slider and the third rotor.
In the above scheme, the Z-axis rear light blocking assembly includes a fourth slider, a fourth mover and a fourth light barrier, the Z-axis guide rail is provided with the fourth slider and the fourth mover, and the fourth slider and the fourth mover are provided with the fourth light barrier.
A novel variable FOV high-precision CT collimator using method comprises the following steps:
s1: the CT system receives patient examination information;
s2: adjusting CT system parameters according to the examined part;
s3: the collimator receives preset parameters of a CT system, a first rotor and a second rotor on the X-axis linear motor move towards the same direction or the opposite direction, the X-axis grating detects that the rotor reaches an expected position in real time, a third rotor and a fourth rotor on the Z-axis linear motor move towards the same direction or the opposite direction, and the Z-axis grating detects that the rotor reaches the expected position in real time;
s4: the openings of the X-axis light shielding plate and the Z-axis light shielding plate reach the formulated FOV and the field size of the CT system;
s5: exposing the bulb according to preset parameters of a CT system;
s6: the automatic exposure control assembly receives the X-ray and detects whether the dosage reaches a preset parameter or not; if the parameter does not reach the preset parameter, the automatic exposure control assembly drives the CT system to correct;
s7: the detector receives the X-rays and converts the X-rays into a CT image.
The invention has the advantages and beneficial effects that: the invention provides a novel variable FOV high-precision CT collimator with bidirectional adjustment and improved precision and a use method thereof. The inventive method for using the linear motor and the grating feedback maximally reduces the complexity of a mechanical structure, the running speed of the linear motor can be adjusted according to actual requirements, the grating can perform real-time position feedback, and the precision reaches 5 mu m. The high-precision linear guide rail is used, so that the X-axis and the Y-axis can run more smoothly, and the phenomenon of blockage or blockage does not exist. The linear guide rail is directly connected with the stator of the linear motor, so that the rigidity is better, the movement is smoother, and almost no noise is generated. The more humanized design can adjust the field size of X-axis and Z-axis simultaneously, and adjust different radiation areas aiming at different examination parts, thereby avoiding more radiation to the patient. The collimator is internally provided with an automatic exposure control assembly, can detect whether the KV value of the X-ray reaches an expected set standard, and feeds back the detection result to the CT system for correction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention;
fig. 2 is a top view of fig. 1.
In the figure: 1. the device comprises a mounting base plate 2, an X-axis linear motor stator and a grating 3, a Z-axis linear motor stator and a grating 4, an X-axis guide rail 5, an X-axis left light blocking assembly 6, an X-axis right light blocking assembly 7, a Z-axis guide rail 8, a Z-axis front light blocking assembly 9, a Z-axis rear light blocking assembly 10, an automatic exposure control assembly 11, a wave state filtering assembly 51, a first slider 52, a first rotor 53, a first light blocking plate 61, a second slider 62, a second rotor 63, a second light blocking plate 81, a third slider 82, a third rotor 83, a third light blocking plate 91, a fourth slider 92, a fourth rotor 93 and a fourth light blocking plate
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in figures 1 and 2, the invention is a novel variable FOV high-precision CT collimator, which comprises a mounting base plate 1, an X-axis linear motor stator and grating 2, a Z-axis linear motor stator and grating 3, an X-axis guide rail 4, an X-axis left side light blocking assembly 5, an X-axis right side light blocking assembly 6, a Z-axis guide rail 7, a Z-axis front side light blocking assembly 8, a Z-axis rear side light blocking assembly 9, an automatic exposure control assembly 10 and a wave state filtering assembly 11, wherein the mounting base plate 1 is provided with the X-axis linear motor stator and grating 2 and the Z-axis linear motor stator and grating 3, the X-axis linear motor stator and grating 2 is provided with the X-axis guide rail 4, the X-axis guide rail 4 is provided with the X-axis left side light blocking assembly 5 and the X-axis right side light blocking assembly 6, the Z-axis linear motor stator and grating 3 is provided with the Z-axis guide rail 7, the Z-axis guide rail 7 is provided with the Z-axis front side light blocking assembly 8 and the Z-axis rear side light blocking assembly 9, an automatic exposure control assembly 10 is further arranged on the mounting base plate 1, and the automatic exposure control assembly 10 is connected with a wave state filtering assembly 11.
The X-axis left light blocking assembly 5 includes a first slider 51, a first mover 52 and a first light blocking plate 53, the X-axis guide rail 4 is provided with the first slider 51 and the first mover 52, and the first slider 51 and the first mover 52 are provided with the first light blocking plate 53.
The X-axis right light blocking assembly 6 comprises a second slider 61, a second mover 62 and a second light blocking plate 63, the X-axis guide rail 4 is provided with the second slider 61 and the second mover 62, and the second slider 61 and the second mover 62 are provided with the second light blocking plate 63.
The Z-axis front light-blocking assembly 8 comprises a third sliding block 81, a third rotor 82 and a third light-blocking plate 83, the Z-axis guide rail 7 is provided with the third sliding block 81 and the third rotor 82, and the third sliding block 81 and the third rotor 82 are provided with the third light-blocking plate 83.
The Z-axis rear light blocking assembly 9 includes a fourth slider 91, a fourth mover 92 and a fourth light blocking plate 93, the Z-axis guide rail 7 is provided with the fourth slider 91 and the fourth mover 92, and the fourth slider 91 and the fourth mover 92 are provided with the fourth light blocking plate 93.
And respectively assembling the stator and the grating 2 of the X-axis linear motor, the stator and the grating 3 of the Z-axis linear motor and the wave state filtering component 11 with the installation bottom plate 1 according to the designed spatial position. The X-axis guide rail 4, the X-axis linear motor stator and the grating 2 are assembled according to the designed spatial position, the X-axis left light blocking assembly 5 is respectively connected with the X-axis linear motor stator, the grating 2 and the X-axis guide rail 4, and the X-axis right light blocking assembly 6 is respectively connected with the X-axis linear motor stator, the grating 2 and the X-axis guide rail 4. The Z-axis guide rail 7, the Z-axis linear motor stator and the grating 3 are assembled according to the designed spatial position, the Z-axis rear side light-shielding component 9 is respectively connected with the Z-axis linear motor stator, the grating 3 and the Z-axis guide rail 7, and the Z-axis front side light-shielding component 8 is respectively connected with the Z-axis linear motor stator, the grating 3 and the Z-axis guide rail 7. When an X-ray light source passes through the wave state filtering component 11, X-rays can be emitted to the place and are shielded by the light blocking plate, the FOV can be enlarged or reduced by controlling the linear motor to enable the X-axis left light blocking component 5 and the X-axis right light blocking component 6 to simultaneously run in opposite directions or simultaneously run in opposite directions, the adjustment in the Z-axis direction is the same as that, and the radiation dose of the X-rays can be limited by simultaneously reducing the X-axis and the Z-axis. The automatic exposure control assembly 10 is connected with the wave state filtering assembly 11 and is arranged inside the X-direction light barrier and the Z-direction light barrier. The automatic exposure control assembly 10 is connected with the X-axis linear motor stator and the grating 2 and the Z-axis linear motor stator and the grating 3 through an electronic control system, and when an operator selects different human body positions and radiation doses to be scanned, the automatic exposure control assembly 10 can compare the received X-ray doses with system parameters, so that the FOV of the X-axis and the radiation area of the Z-axis are automatically adjusted.
A novel variable FOV high-precision CT collimator using method comprises the following steps:
s1: the CT system receives patient examination information;
s2: adjusting CT system parameters according to the examined part;
s3: the collimator receives preset parameters of a CT system, a first rotor and a second rotor on the X-axis linear motor move towards the same direction or the opposite direction, the X-axis grating detects that the rotor reaches an expected position in real time, a third rotor and a fourth rotor on the Z-axis linear motor move towards the same direction or the opposite direction, and the Z-axis grating detects that the rotor reaches the expected position in real time;
s4: the openings of the X-axis light shielding plate and the Z-axis light shielding plate reach the formulated FOV and the field size of the CT system;
s5: exposing the bulb according to preset parameters of a CT system;
s6: the automatic exposure control assembly receives the X-ray and detects whether the dosage reaches a preset parameter or not; if the parameter does not reach the preset parameter, the automatic exposure control assembly drives the CT system to correct;
s7: the detector receives the X-rays and converts the X-rays into a CT image.
The invention can simultaneously adjust the X-ray radiation area of the CT collimator in the Z-axis and X-axis directions, creates a novel linear motor control method adopting a double-action mode, ensures that all structural parts become very concise, and ensures that the linear motor provided with the grating ruler feedback can ensure that the Z-axis and X-axis movement precision is high, the response speed is high, and simultaneously, the linear motor is better and quieter by means of digital pulse output. An automatic exposure control assembly is arranged in the collimator and integrated with the whole system, and the automatic exposure control assembly can feed back the X-ray dosage to the high-voltage system in real time for dosage adjustment according to the received X-ray dosage. And the automatic exposure control component is used for feeding back the X-ray dosage in real time. Each high-performance servo driver controls a linear motor, and the excellent servo performance and frequency response can reach 3-5kHz advanced in the industry. The advanced auto-tuning function can almost completely eliminate the tracking difference and reduce the settling time to almost zero. The FOV can be adjusted while controlling the X-axis and Z-axis irradiation zones. The linear motor with the grating ruler feedback can ensure high Z-axis and X-axis motion precision by means of digital pulse output, has high response speed and is more silent, and the mechanical structure is simpler, easy to manufacture and convenient to install.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A novel variable FOV high-precision CT collimator is characterized by comprising an installation bottom plate, an X-axis linear motor stator and a grating, a Z-axis linear motor stator and a grating, an X-axis guide rail, an X-axis left side light blocking assembly, an X-axis right side light blocking assembly, a Z-axis guide rail, a Z-axis front side light blocking assembly, a Z-axis rear side light blocking assembly, an automatic exposure control assembly and a wave state filtering assembly, wherein the installation bottom plate is provided with the X-axis linear motor stator and the grating and the Z-axis linear motor stator and the grating, the X-axis linear motor stator and the grating are provided with the X-axis guide rail, the X-axis guide rail is provided with the X-axis left side light blocking assembly and the X-axis right side light blocking assembly, the Z-axis linear motor stator and the grating are provided with the Z-axis guide rail, the Z-axis guide rail is provided with the Z-axis front side light blocking assembly and the Z-axis rear side light blocking assembly, and the installation bottom plate is further provided with the automatic exposure control assembly, the automatic exposure control assembly is connected with the wave state filtering assembly.
2. The novel variable FOV high-precision CT collimator as claimed in claim 1, wherein said X-axis left light-blocking assembly comprises a first slider, a first mover and a first light-blocking plate, said X-axis guide rail is provided with a first slider and a first mover, and said first slider and said first mover are provided with a first light-blocking plate.
3. The novel variable FOV high-precision CT collimator as claimed in claim 1, wherein the X-axis right light blocking assembly comprises a second slider, a second mover and a second light blocking plate, the X-axis guide rail is provided with the second slider and the second mover, and the second slider and the second mover are provided with the second light blocking plate.
4. The novel variable FOV high-precision CT collimator as claimed in claim 1, wherein the Z-axis front light-blocking assembly comprises a third slider, a third rotor and a third light-blocking plate, the Z-axis guide rail is provided with the third slider and the third rotor, and the third slider and the third rotor are provided with the third light-blocking plate.
5. The novel variable FOV high-precision CT collimator as claimed in claim 1, wherein said Z-axis rear light-blocking assembly comprises a fourth slider, a fourth mover and a fourth light-blocking plate, said Z-axis guide rail is provided with said fourth slider and said fourth mover, and said fourth slider and said fourth mover are provided with said fourth light-blocking plate.
6. The use method of the novel variable FOV high-precision CT collimator as claimed in claim 1, characterized by comprising the following steps:
s1: the CT system receives patient examination information;
s2: adjusting CT system parameters according to the examined part;
s3: the collimator receives preset parameters of a CT system, a first rotor and a second rotor on the X-axis linear motor move towards the same direction or the opposite direction, the X-axis grating detects that the rotor reaches an expected position in real time, a third rotor and a fourth rotor on the Z-axis linear motor move towards the same direction or the opposite direction, and the Z-axis grating detects that the rotor reaches the expected position in real time;
s4: the openings of the X-axis light shielding plate and the Z-axis light shielding plate reach the formulated FOV and the field size of the CT system;
s5: exposing the bulb according to preset parameters of a CT system;
s6: the automatic exposure control assembly receives the X-ray and detects whether the dosage reaches a preset parameter or not; if the parameter does not reach the preset parameter, the automatic exposure control assembly drives the CT system to correct;
s7: the detector receives the X-rays and converts the X-rays into a CT image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210422469.9A CN114822905A (en) | 2022-04-21 | 2022-04-21 | Novel variable FOV high-precision CT collimator and use method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210422469.9A CN114822905A (en) | 2022-04-21 | 2022-04-21 | Novel variable FOV high-precision CT collimator and use method |
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| CN114822905A true CN114822905A (en) | 2022-07-29 |
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| CN202210422469.9A Pending CN114822905A (en) | 2022-04-21 | 2022-04-21 | Novel variable FOV high-precision CT collimator and use method |
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