CN113796881A - Variable focal length cone beam CT device - Google Patents

Variable focal length cone beam CT device Download PDF

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Publication number
CN113796881A
CN113796881A CN202111216808.XA CN202111216808A CN113796881A CN 113796881 A CN113796881 A CN 113796881A CN 202111216808 A CN202111216808 A CN 202111216808A CN 113796881 A CN113796881 A CN 113796881A
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CN
China
Prior art keywords
detector
substrate
ray source
linear
ray
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Pending
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CN202111216808.XA
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Chinese (zh)
Inventor
刘廷
葛振华
尹超
张同冰
张增辉
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Shandong Medical Health Technology Co ltd
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Shandong Medical Health Technology Co ltd
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Priority to CN202111216808.XA priority Critical patent/CN113796881A/en
Publication of CN113796881A publication Critical patent/CN113796881A/en
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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]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A61B6/032—Transmission computed tomography [CT]
    • A61B6/035—Mechanical aspects of CT
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • 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
    • A61B6/4021—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis involving movement of the focal spot
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4064—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
    • A61B6/4085—Cone-beams
    • 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
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
    • 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
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • 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
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/4452—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being able to move relative to each other
    • A61B6/51—

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Theoretical Computer Science (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

The invention discloses a variable focal length cone beam CT device, comprising: the device comprises a detector, a substrate, a translation device, a ray source and a collimator; wherein: the detector is arranged at the end A of the substrate, the ray source is arranged at the end B of the substrate through the translation device, and the collimator is fixedly arranged at the ray outlet of the ray source; translation device is fixed to be set up in the base plate bottom, and it includes: the device comprises a ray source mounting plate, a linear guide device and a linear driving device; the invention is suitable for the technical field of dental X-ray imaging equipment, adopts a detector with a large visual field, and enables the ray source to do linear motion relative to the detector through the translation device, so that the device successfully shoots the image at the right side of the skull at one time on the premise of shooting CT, panorama and the like, thereby reducing the shooting time of a patient (reducing the radiation time) and improving the imaging quality.

Description

Variable focal length cone beam CT device
Technical Field
The invention belongs to the technical field of dental X-ray imaging equipment, and particularly relates to a variable focal length cone beam CT device.
Background
With the development of technology, cone beam ct (cbct) is now widely used in the field of oral medicine, becoming one of the most common diagnostic tools for oral physicians. The cone beam oral CT commonly used in the market at present mainly comprises a three-in-one oral CT and a large-visual-field professional oral CT.
The two types of equipment can realize the shooting of CT, panorama, cranial orthopaedics and the like, wherein the three-in-one oral CT adopts a scheme of shooting the CT, panorama and cranial orthopaedics by using different detectors respectively, mainly because the field of vision of a main detector is smaller and is not enough to shoot the whole cranial orthopaedics image, an auxiliary detector special for shooting the cranial orthopaedics image is added, but because the auxiliary detector adopts a strip-shaped detector (mainly for reducing the cost), the scanning mode is needed to be adopted when the complete cranial orthopaedics image is needed to be obtained, and the shooting time is long. According to the advantage of large visual field of the large-visual-field professional oral CT, when an image at the front side of the skull needs to be shot, the CT is shot in advance, and the required image is generated through algorithm reconstruction (because the distance between the head of a person in a cluster and a radiation source is required to be different when the CT is shot and the front side of the skull is shot, if the CT is shot directly, the image distortion is too large because the distance between a detector, the head of a patient and the radiation source is too small); however, this method requires a long time, causes a large amount of radiation to the patient, and has poor image quality.
Disclosure of Invention
It is an object of the present invention to overcome the disadvantages of the prior art and to provide a variable focus cone-beam CT apparatus.
In order to achieve the purpose, the invention adopts the following technical scheme:
a variable focus cone beam CT apparatus comprising:
the device comprises a detector, a substrate, a translation device, a ray source and a collimator; wherein:
the detector is arranged at the end A of the substrate, the ray source is arranged at the end B of the substrate through the translation device, and the collimator is fixedly arranged at the ray outlet of the ray source;
translation device is fixed to be set up in the base plate bottom, and it includes: the device comprises a ray source mounting plate, a linear guide device and a linear driving device;
the ray source is fixedly arranged on a ray source mounting plate of the translation device, and the linear driving device can drive the linear driving device to do translation motion along the linear guiding device.
Preferably, the linear guide device is arranged along the X-axis direction, and the linear driving device is any one of a screw rod transmission device, a belt transmission device, a chain transmission device, a gear and rack transmission device, an air cylinder, an electric cylinder or a linear motor.
Preferably, the apparatus further comprises a detector biasing device for enabling the detector to move in a translational manner along the Y axis relative to the substrate.
Preferably, the detector biasing means comprises: the device comprises a bias guide device, a detector mounting plate and a bias driving device;
the offset guide device is arranged along the Y-axis direction;
the detector is fixedly arranged on the detector mounting plate, and the offset driving device drives the detector mounting plate to move along the offset guide device.
Preferably, the detector biasing device further comprises a biasing substrate;
the bias guide device and the bias driving device are arranged on one side of the bias substrate, and the bias substrate is fixedly arranged at the A end of the substrate.
Preferably, the offset driving device is any one of a screw rod transmission device, a belt transmission device, a chain transmission device, a cam mechanism, a slider-crank mechanism, a rack-and-pinion transmission device, an air cylinder, an electric cylinder or a linear motor.
Preferably, the collimator is provided with two Y-direction ray blocking sheets and two Z-direction ray blocking sheets along the Y direction and the Z direction respectively;
the Y-direction ray blocking plate and the Z-direction ray blocking plate are respectively fixed on the Y, Z-direction collimator guide device;
the two Y-direction ray blocking pieces and the two Z-direction ray blocking pieces are driven to respectively move relatively along the Y direction and the Z direction by a driving device consisting of a nut, a positive and negative screw rod and a collimator adjusting motor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, the detector with a large visual field is adopted, and the translation device enables the ray source to do linear motion (increase the distance between the ray source and the detector) relative to the detector, so that the device successfully shoots the image of the right side of the skull at one time on the premise of having the functions of shooting CT, panorama and the like, thereby reducing the shooting time of a patient (reducing the radiation time), and improving the imaging quality.
Drawings
FIG. 1 is a first general structural diagram (normal state) of a variable focal length cone-beam CT apparatus according to the present invention;
FIG. 2 is a schematic diagram of the overall structure of a variable focal length cone-beam CT apparatus according to the present invention (with the radiation source extended);
FIG. 3 is a first schematic diagram (default state) of a detector biasing arrangement in a variable focus cone-beam CT apparatus according to the present invention;
FIG. 4 is a second schematic structural diagram (biased state) of a detector biasing device in the variable focal length cone-beam CT apparatus according to the present invention;
FIG. 5 is a schematic diagram of a detector biasing device in a variable focal length cone-beam CT apparatus according to a third embodiment of the present invention;
FIG. 6 is a schematic diagram of a collimator structure of a variable focal length cone-beam CT apparatus according to the present invention;
FIG. 7 is a schematic diagram of a linear driving device for translating a radiation source in a variable focal length cone-beam CT apparatus according to the present invention.
Reference numerals: 1. a detector; 2. a detector biasing device; 3. a substrate; 4. a translation device; 5. a radiation source; 6. a collimator; 21. biasing the substrate; 22. a biasing guide; 23. a detector mounting plate; 24. a bias drive device; 41. a ray source mounting plate; 42. a linear guide; 43. a linear drive device; 61. a Z-direction ray blocking sheet; 62. a Y-direction ray blocking sheet; 63. a nut; 64. a positive and negative screw rod; 65. a motor; 431. a linear drive motor; 432. a coupling; 433. a screw rod supporting seat; 434. a linear drive nut; 435. and a linear driving device screw rod.
Detailed Description
An embodiment of a variable focus cone-beam CT apparatus according to the present invention is further described with reference to fig. 1-7. A variable focal length cone beam CT apparatus of the present invention is not limited to the description of the following embodiments.
Example 1:
this embodiment provides an embodiment of a variable focal length cone beam CT apparatus, as shown in fig. 1 to 6, including:
the device comprises a detector 1, a substrate 3, a translation device 4, a ray source 5 and a collimator 6; wherein:
the detector 1 is arranged at the end A of the substrate 3, the ray source 5 is arranged at the end B of the substrate 3 through the translation device 4, and the collimator 6 is fixedly arranged at a ray outlet of the ray source 5;
translation device 4 is fixed to be set up in base plate 3 bottom, and it includes: a radiation source mounting plate 41, a linear guide device 42, a linear drive device 43;
the radiation source 5 is fixedly arranged on the radiation source mounting plate 41 of the translation device 4, and the linear driving device 43 can drive the translation device to move along the linear guide device 42.
Further, the linear guide device 42 is disposed along the X-axis direction, and the linear driving device 43 is any one of a screw transmission, a belt transmission, a chain transmission, a rack-and-pinion transmission, an air cylinder, an electric cylinder, or a linear motor.
Furthermore, the device also comprises a detector biasing device 2, so that the detector 1 can move in a translation mode along the Y axis relative to the substrate 3.
Further, the detector biasing device 2 includes: the offset guide device 22, the detector mounting plate 23 and the offset driving device 24;
the offset guide 22 is disposed along the Y-axis direction;
the detector 1 is fixedly arranged on a detector mounting plate 23, and is driven to move along the offset guide 22 by an offset driving device 24.
Further, the probe biasing device 2 further includes a biasing substrate 21;
the bias guide 22 and the bias drive device 24 are both provided on the side of the bias substrate 21, and the bias substrate 21 is fixedly provided on the a end of the substrate 3.
Further, the offset driving device 24 is any one of a screw transmission, a belt transmission, a chain transmission, a cam mechanism, a slider-crank mechanism, a rack-and-pinion transmission, an air cylinder, an electric cylinder, or a linear motor.
Further, the collimator 6 is provided with two Y-direction ray blocking sheets 62 and two Z-direction ray blocking sheets 61 along the Y-direction and the Z-direction, respectively;
the Y-direction ray blocking plate 62 and the Z-direction ray blocking plate 61 are respectively fixed on the Y, Z-direction collimator guide device 66;
the two Y-direction ray blocking sheets 62 and the two Z-direction ray blocking sheets 61 are driven to respectively move relatively along the Y direction and the Z direction by a driving device consisting of a nut 63, a positive and negative screw rod 64 and a collimator adjusting motor 65.
Example 2:
this embodiment shows an embodiment of a variable focal length cone beam CT apparatus, as shown in fig. 2, the core components include: the device comprises a detector 1, a substrate 3, a translation device 4, a ray source 5, a collimator 6 and the like;
the detector 1 is located at the A end of the substrate 3, the ray source 5 is located at the B end of the substrate 3 through the translation device 4, and the collimator 6 is fixed at the ray outlet of the ray source 5.
Further, as shown in fig. 7, the translation device 4 is fixed to the substrate 3, and includes: a radiation source mounting plate 41, a linear guide device 42, a linear driving device 43, etc. Referring to fig. 5, the linear driving device 43 is composed of a linear driving device motor 431, a coupling 432, a lead screw supporting base 433, a linear driving device nut 434, a linear driving device lead screw 435, and the linear driving device nut 434 is connected with the radiation source mounting plate 41.
Further, as shown in fig. 1 and fig. 2, the radiation source 5 is fixed to the radiation source mounting plate 41 of the translation device 4, when the radiation source 5 needs to move, the linear driving device motor 431 of the linear driving device 43 rotates to drive the linear driving device screw 435 to rotate through the coupling 432, so that the linear driving device nut 434 moves along the linear guide device 42(X direction), and further drives the radiation source 5 to make a translation motion along the linear guide device 42(X direction). Therefore, the position of the ray source 5 relative to the detector 1 can be adjusted to adapt to two different states of relative position requirements under different influences of CT shooting, panorama shooting, skull positive position and the like.
Furthermore, in order to expand the view field of the device during CT shooting, a detector bias device 2 is added, and the detector bias device 2 comprises: an offset guide 22, a probe mounting plate 23, an offset drive 24, and the like.
As shown in fig. 3-5, the detector 1 is fixed on the detector mounting plate 23, and the offset driving device 24 drives the detector to move along the Y direction of the offset guide device, so that the detector makes translational motion along the Y axis relative to the substrate 3, and the detectable range of the detector is increased.
As shown in fig. 6, the collimator 6 is in two mutually perpendicular directions: two Y-direction ray blocking sheets 62 and two Z-direction ray blocking sheets 61 are arranged in the Y direction and the Z direction respectively. The Y-direction ray blocking sheets 62 and the Z-direction ray blocking sheets 61 are respectively fixed on the Y, Z-direction collimator guide device 66, and the two Y-direction ray blocking sheets 62 and the two Z-direction ray blocking sheets 61 are driven to respectively move relatively along the Y direction and the Z direction by a driving device consisting of a nut 63, a positive and negative screw rod 64 and a collimator adjusting motor 65, so that the positions of the Y-direction ray blocking sheets 62 and the Z-direction ray blocking sheets 61 are adjusted according to different shooting scene requirements.
The working principle is as follows: as shown in fig. 1-7, the detector 1 with a large field of view is adopted, and the translation device 4 enables the radiation source 5 to make linear motion (increase the distance between the radiation source 5 and the detector 1) relative to the detector 1, so that the device can successfully shoot the right lateral skull image at one time on the premise of having the functions of shooting CT, panorama and the like. Thereby reducing the time for shooting the patient (reducing the time for receiving radiation) and improving the imaging quality
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (7)

1. A variable focus cone beam CT apparatus, comprising:
the device comprises a detector (1), a substrate (3), a translation device (4), a ray source (5) and a collimator (6); wherein:
the detector (1) is arranged at the end A of the substrate (3), the ray source (5) is arranged at the end B of the substrate (3) through the translation device (4), and the collimator (6) is fixedly arranged at a ray outlet of the ray source (5);
translation device (4) are fixed to be set up in base plate (3) bottom, and it includes: a ray source mounting plate (41), a linear guide device (42) and a linear driving device (43);
the ray source (5) is fixedly arranged on a ray source mounting plate (41) of the translation device (4), and the linear driving device (43) can drive the ray source mounting plate to do translation motion along the linear guiding device (42).
2. The variable focus cone-beam CT apparatus of claim 1, wherein: the linear guide device (42) is arranged along the X-axis direction, and the linear driving device (43) is any one of screw rod transmission, belt transmission, chain transmission, gear and rack transmission, an air cylinder, an electric cylinder or a linear motor.
3. The variable focus cone-beam CT apparatus of claim 1, wherein: the detector is characterized by further comprising a detector biasing device (2) which enables the detector (1) to move in a translation mode along the Y axis relative to the substrate (3).
4. The variable focus cone-beam CT apparatus of claim 3, wherein: the detector biasing device (2) comprises: the device comprises a bias guide device (22), a detector mounting plate (23) and a bias drive device (24);
the offset guide device (22) is arranged along the Y-axis direction;
the detector (1) is fixedly arranged on the detector mounting plate (23), and the offset driving device (24) drives the detector to move along the offset guide device (22).
5. The variable focus cone-beam CT apparatus of claim 4, wherein: the detector biasing device (2) further comprises a biasing substrate (21);
the bias guide device (22) and the bias drive device (24) are arranged on one side of the bias substrate (21), and the bias substrate (21) is fixedly arranged at the A end of the substrate (3).
6. The variable focus cone-beam CT apparatus of claim 4, wherein: the offset driving device (24) is any one of screw rod transmission, belt transmission, chain transmission, cam mechanism, crank block mechanism, gear and rack transmission, air cylinder, electric cylinder or linear motor.
7. The variable focus cone-beam CT apparatus of claim 1, wherein: the collimator (6) is respectively provided with two Y-direction ray blocking sheets (62) and two Z-direction ray blocking sheets (61) along the Y direction and the Z direction;
the Y-direction ray blocking plate (62) and the Z-direction ray blocking plate (61) are respectively fixed on the Y, Z-direction collimator guide device (66);
the two Y-direction ray blocking sheets (62) and the two Z-direction ray blocking sheets (61) are driven to respectively move relatively along the Y direction and the Z direction by a driving device consisting of a nut (63), a positive and negative screw rod (64) and a collimator adjusting motor (65).
CN202111216808.XA 2021-10-19 2021-10-19 Variable focal length cone beam CT device Pending CN113796881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111216808.XA CN113796881A (en) 2021-10-19 2021-10-19 Variable focal length cone beam CT device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111216808.XA CN113796881A (en) 2021-10-19 2021-10-19 Variable focal length cone beam CT device

Publications (1)

Publication Number Publication Date
CN113796881A true CN113796881A (en) 2021-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111216808.XA Pending CN113796881A (en) 2021-10-19 2021-10-19 Variable focal length cone beam CT device

Country Status (1)

Country Link
CN (1) CN113796881A (en)

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