A head positioning device and positioning method for CBCT equipment

Abstract

The present invention discloses a head positioning device and positioning method for CBCT equipment, the head positioning device for CBCT equipment comprises a base, the top of the base is fixedly connected with an electric lifting seat for adjusting the height position of the head of the detected object, the top of the base is fixedly connected with a side connecting rod, the top of the side connecting rod is provided with a jaw support for supporting the lower jaw of the detected object, the top of the base is fixedly connected with a frame, and the end of the frame away from the base is rotatably connected with a rotating frame. The head positioning device and positioning method for CBCT equipment provided by the present invention effectively suppress the front and back pitching of the human head, improve the head fixing effect, and have a simple structure and convenient operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of CBCT equipment, and in particular, relates to a head positioning device and a positioning method for CBCT equipment. Background Art

[0002] CBCT equipment is an imaging examination used for oral diagnosis and treatment. Specifically, the subject sits on the lifting seat of the CBCT equipment and uses the lifting seat to adjust the height of the head so that the head can contact and position with the head positioning device, which is convenient for subsequent three-dimensional cone beam X-ray scanning to generate three-dimensional images;

[0003] The existing oral CBCT head positioning devices are divided into the following categories:

[0004] The first type is a jaw rest that supports the chin. Two rotatable vertical rods are located on both sides of the jaw rest. The vertical rods rotate toward the middle to clamp the two sides of the head. This method of clamping the cheeks or temples on both sides of the head cannot effectively prevent the head from pitching forward and backward, and the fixing effect is poor.

[0005] The second type is a jaw support that supports the chin. The vertical rods on both sides of the jaw support are fixed and cannot rotate. A headband with adjustable size is sleeved on the vertical rods to fix the head. The structure used in the specific implementation is relatively complex, and the operation of adjusting the size of the headband is complicated and takes a long time.

[0006] The third type is that the chin is supported by a jaw rest, and a head rest that can move horizontally or tiltedly forward and backward is arranged at the back of the head to support the back of the head. The operation of the head rest that can move horizontally forward and backward needs to be performed behind the person being tested, and it needs to be tightened again after it is in place. The operation is not convenient enough, and the overload situation cannot be automatically released, which is not safe enough. The head rest that moves tiltedly forward and backward drags the back of the head, and the head rest needs to be supported on one side of the jaw rest. A long tubular structure is generated from the back of the head to the support. The shoulders need to be avoided and materials with less radiation absorption and high strength must be used. The structure is complex and the cost is high. Summary of the invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide a head positioning device and a positioning method for CBCT equipment.

[0008] To achieve the aforementioned invention purpose, the technical solution adopted by the present invention includes: a base, the top of the base is fixedly connected with an electric lifting seat for adjusting the height position of the head of the detected object in the sitting posture, the top of the base is fixedly connected with a side connecting rod, the top of the side connecting rod is provided with a jaw support for supporting the lower jaw of the detected object, the top of the base is fixedly connected with a frame, the end of the frame away from the base is rotatably connected with a rotating frame, the bottom of the rotating frame is rotatably connected with a base, an adjustment port is opened through the base, a sliding rod is slidably connected in the adjustment port, the end of the sliding rod close to the frame is fastened with a head support plate for supporting and positioning the back of the head of the detected object, and a sliding resistance adjustment component for limiting its movement is provided in the sliding rod;

[0009] It also includes a control unit and a camera fixedly connected to one side of the rotating frame. The camera collects the side face information of the detected object to establish a camera image coordinate system and transmits it to the control unit. The control unit identifies the first feature and the second feature according to the side face information and then establishes two feature connecting lines, and compares the connecting lines with the preset horizontal line in the camera image coordinate system to obtain the pitch information of the head of the detected object. The control unit controls the electric lifting seat to rise or fall according to the pitch information of the head of the detected object, and at this time, the chin of the detected object rests on the fixed jaw rest to adjust the pitch angle of the detected object.

[0010] Preferably, the sliding resistance adjustment assembly comprises a button, a front end, a first elastic member, a transmission rod, a resistance rack, a docking interface, a swing rod, a second elastic member and a resistance block, the sliding rod is provided with a transmission groove adapted to the transmission rod, the transmission rod is slidably connected to the transmission groove, the button is slidably connected to the notch of the transmission groove, the transmission rod and the front end are integrally formed, the front end is fixedly connected to the button, a reset groove is provided at a position of the transmission rod near the front end, one end of the first elastic member is fixedly connected to the reset groove, the other end of the first elastic member is fixedly connected to the sliding rod, the swing rod is rotatably connected in the sliding rod, one end of the second elastic member is fixedly connected to the swing rod, the other end of the second elastic member is fixedly connected to the sliding rod, an end of the transmission rod close to the swing rod is provided with a docking interface for inserting the swing rod, the resistance rack is fixedly connected to the base and arranged on the top of the swing rod, the resistance block is fixedly connected to an end of the swing rod away from the docking interface, and the resistance block abuts against teeth of the resistance rack;

[0011] By setting the sliding resistance adjustment component, when the position of the head support needs to be adjusted, the restriction of the head support can be loosened. By pushing the end of the sliding rod close to the button, the doctor can adjust the position of the head support while standing in front of the object being measured. The simple operation improves the convenience of the doctor in adjusting the position of the head support.

[0012] Preferably, a rotating ring is fixedly connected to the top of the base, the rotating ring is rotatably connected to the rotating frame, a ray source is fixedly connected to one side of the bottom of the rotating frame, a detector is fixedly connected to the side of the bottom of the rotating frame opposite to the ray source, and the radioactive rays emitted by the ray source can be detected and received by the detector;

[0013] A conical beam of X-rays is emitted from a ray source to scan the object being inspected. The collected data information is reorganized in a computer to obtain a three-dimensional image of the target.

[0014] Preferably, the top of the side connecting rod is fixedly connected with a column, one side of the column is fixedly connected with a transverse rotating shaft, one side of the transverse rotating shaft is provided with a side rotating rod, the side rotating rod is rotatably connected with the transverse rotating shaft, one end of the side rotating rod away from the transverse rotating shaft is fixedly connected with a short support rod, and the jaw support is fixedly connected with the top of the short support rod;

[0015] It should be noted that the side swivel rod rotates in a plane with the transverse axis as the axis. Before the detected object sits on the electric lift seat, the side swivel rod can be rotated and opened so that it does not hinder the detected object from sitting down. After the detected object sits down, force can be applied to the side swivel rod to reset it.

[0016] Preferably, the control unit includes a seat up control button and a seat down control button, and the seat up control button and the seat down control button are both electrically connected to the electric lift seat. An inclined plane is provided on the top of the column, and the seat up control button and the seat down control button are equidistantly fixed on the top of the inclined plane. The up and down of the electric lift seat are respectively controlled by the seat up control button and the seat down control button, so as to facilitate the overall height adjustment of the electric lift seat.

[0017] Preferably, the sliding rod is threadedly connected with a plurality of positioning bolts, and the plurality of positioning bolts are symmetrically arranged at equal distances. The head support plate is provided with a plurality of threaded blind holes that match the positioning bolts. The positioning bolts and the threaded blind holes are threadedly connected to fasten the sliding rod and the head support plate. The head support plate is fixed by the positioning bolts so that it can be disassembled. When the head support plate is obviously worn and depreciated during long-term use, a spare head support plate can be taken out by unscrewing the positioning bolts from the original head support plate and removing it, and then screwing the positioning bolts into the spare head support plate to complete the replacement of the head support plate.

[0018] Preferably, the first feature is the upper edge point of the ear canal on the side of the detected object, and the second feature is the lower edge point of the eye socket on the same side as the first feature of the detected object. If the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is less than 3°, it is considered that the pitch is qualified; if the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is higher than the lower edge point of the eye socket, it is judged to be lowering the head, and the control unit controls the electric lifting seat to slowly descend until the pitch is qualified; if the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is lower than the lower edge point of the eye socket, it is judged to be raising the head, and the control unit controls the electric lifting seat to slowly rise until the pitch is qualified;

[0019] During the image acquisition process, the camera can rotate around the detected object in a small range to expand the acquisition range. The data collected by the camera is two-dimensional image video stream data.

[0020] Compared with the prior art, the advantages of the present invention include:

[0021] (1) The present invention provides a head positioning device and positioning method for CBCT equipment, which supports the lower jaw of the subject to be tested by a jaw support and then supports the back of the subject's head with a head support plate, which can effectively suppress the front and back pitch of the head and improve the head fixation effect;

[0022] (2) The present invention provides a head positioning device and positioning method for CBCT equipment. By pressing or releasing a button, the sliding resistance adjustment component is controlled to loosen or position the sliding rod. In this way, after the lower jaw of the subject is supported on the jaw support, the head support plate can be controlled to move to fit the back of the head of the subject by pressing the button. The structure is simple and the operation is convenient. The doctor can adjust the position of the head support plate while standing in front of the subject. The simple operation improves the convenience of the doctor in adjusting the position of the head support plate. The component used to support the back of the head of the subject is installed on the top of the device, which can reduce its footprint and prevent the subject from being hindered in his activities, thereby improving the flexibility of the head positioning device for CBCT equipment.

[0023] (3) The present invention provides a head positioning device and positioning method for CBCT equipment. The device and positioning method capture the side face image data of the detected object through a camera, determine whether the human head is horizontal based on the position and angle relationship between the first feature and the second feature, and use the electric lifting seat to adjust it. Compared with the prior art, there is no need to use laser as a reference to position the detected object, which simplifies the operation steps of the horizontal position and angle positioning of the detected object, avoids the risk of laser irradiation to the human eye during operation, and improves the safety of head positioning of CBCT equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is an overall schematic diagram of a head positioning device for CBCT equipment in the present invention;

[0026] Figure 2 This is a schematic diagram of the bottom structure of a head positioning device for CBCT equipment in the present invention;

[0027] Figure 3 It is a structural schematic diagram of the head support assembly in the present invention;

[0028] Figure 4 for Figure 3 A magnified view of the structure at center A;

[0029] Figure 5 This is an enlarged view of the structure of the middle column of the present invention;

[0030] Figure 6 It is a schematic diagram of the connection structure between the rotating frame and the base in the present invention;

[0031] Figure 7 A flowchart of head positioning in the present invention;

[0032] Figure 8 This is a schematic diagram of the head positioning pitch pass of the present invention;

[0033] Fig. 9 This is a schematic diagram of the head lowering in the head positioning of the present invention;

[0034] Fig.10 It is a schematic diagram of raising the head in the head positioning of the present invention.

[0035] Reference numerals:

[0036] 1. Base; 2. Side connecting rod; 3. Column; 4. Electric lifting seat; 5. Side swivel rod; 6. Short support rod; 7. Jaw support; 8. Radiation source; 9. Detector; 10. Rack; 11. Rotating frame; 12. Sliding rod; 13. Button; 14. Head support plate; 15. Base; 16. Horizontal rotating shaft; 17. Seat up control button; 18. Seat down control button; 19. Transmission rod; 20. Resistance rack; 21. Front end; 22. First elastic member; 23. Docking port; 24. Swing rod; 25. Second elastic member; 26. Resistance block; 27. Rotating ring. DETAILED DESCRIPTION

[0037] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0038] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "an" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0040] In the description of the present application, the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, when positional terms such as both sides, outside, up and down are used, it should be understood that they are only used to facilitate understanding and description, considering that the structure may be facing other positions.

[0041] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The embodiments of the present invention are intended to introduce and illustrate the structural composition of a head positioning device and a positioning method for a CBCT device and the coordination relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components suitable for the CBCT device in the embodiments of the present invention can be selected according to specific circumstances and are not specifically limited or described herein.

[0043] Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. For those skilled in the art, the present invention can be fully understood without the description of these details.

[0044] Example 1

[0045] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 A head positioning device and positioning method for CBCT equipment, comprising a base 1, the top of the base 1 is fixedly connected with an electric lifting seat 4 for adjusting the height position of the head of the detected object in sitting posture, the top of the base 1 is fixedly connected with a side connecting rod 2, the top of the side connecting rod 2 is provided with a jaw support 7 for supporting the lower jaw of the detected object, the top of the base 1 is fixedly connected with a frame 10, the end of the frame 10 away from the base 1 is rotatably connected with a rotating frame 11, the bottom of the rotating frame 11 is rotatably connected with a base 15, an adjustment port is opened through the base 15, a sliding rod 12 is slidably connected in the adjustment port, the end of the sliding rod 12 close to the frame 10 is fastened with a head support plate 14 for supporting and positioning the back of the head of the detected object, and a sliding resistance adjustment component for limiting its movement is provided in the sliding rod 12;

[0046] It also includes a control unit and a camera fixedly connected to one side of the rotating frame 11. The camera collects the side face information of the detected object to establish a camera image coordinate system and transmits it to the control unit. The control unit identifies the first feature and the second feature according to the side face information and then establishes two feature connecting lines, and compares the connecting lines with the preset horizontal line in the camera image coordinate system to obtain the pitch information of the head of the detected object. The control unit controls the electric lifting seat 4 to rise or fall according to the pitch information of the head of the detected object. At this time, the chin of the detected object rests on the fixed jaw rest 7 to adjust the pitch angle of the detected object.

[0047] It can be understood that after the detected object sits down in the electric lift seat 4, the detected object supports the lower jaw on the top of the jaw rest 7, and the side face information of the detected object is collected by the camera to establish a camera image coordinate system and transmit it to the control unit. The control unit identifies the first feature and the second feature according to the side face information and then establishes two feature connecting lines, and compares the connecting lines with the preset horizontal line in the camera image coordinate system to obtain the pitch information of the head of the detected object, and judges based on the first feature and the second feature connecting line. If the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is less than 3°, the pitch is considered to be qualified; if the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge of the ear canal is higher than the lower edge of the eye socket, it is judged to be bowing the head, and the control unit controls the electric lift seat 4 to slowly descend until the pitch is qualified; if the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge of the ear canal is lower than the lower edge of the eye socket, it is judged to be raising the head, and the control unit controls the electric lift seat 4 to slowly rise until the pitch is qualified.

[0048] In some states, for example, after the pitch angle of the head of the detected object is adjusted, it is necessary to limit the movement space of the back of the head of the detected object, that is, by releasing the restriction of the sliding resistance adjustment component on the sliding rod 12, pushing the sliding rod 12 to move the head support plate 14 to fit the back of the head of the detected object, and then repositioning the sliding rod 12 through the sliding resistance adjustment component to prevent it from moving.

[0049] It should be noted that the relative installation height between the camera and the jaw rest 7 is fixed, and the height difference between the camera and the jaw rest 7 can be input into the control unit as a known quantity.

[0050] See also Figure 3 and Figure 4The sliding resistance adjustment assembly includes a button 13, a front end 21, a first elastic member 22, a transmission rod 19, a resistance rack 20, a docking port 23, a swing rod 24, a second elastic member 25 and a resistance block 26. A transmission groove adapted to the transmission rod 19 is provided in the sliding rod 12, the transmission rod 19 is slidably connected to the transmission groove, the button 13 is slidably connected to the notch of the transmission groove, the transmission rod 19 and the front end 21 are integrally formed, the front end 21 is fixedly connected to the button 13, a reset groove is provided near the front end 21 of the transmission rod 19, one end of the first elastic member 22 is fixedly connected to the reset groove The first elastic member 22 is fixedly connected to the sliding rod 12 at the other end, the swing rod 24 is rotatably connected in the sliding rod 12, one end of the second elastic member 25 is fixedly connected to the swing rod 24, the other end of the second elastic member 25 is fixedly connected to the sliding rod 12, and a docking port 23 for inserting the swing rod 24 is provided at one end of the transmission rod 19 close to the swing rod 24, the resistance rack 20 is fixedly connected to the base 15 and is arranged on the top of the swing rod 24, the resistance block 26 is fixedly connected to the end of the swing rod 24 away from the docking port 23, and the resistance block 26 abuts against the teeth of the resistance rack 20.

[0051] It can be understood that, in the initial state, the first elastic member 22 is in a normal state, and there is a gap between the button 13 and the inner wall of the transmission groove, and the end of the swing rod 24 close to the docking port 23 is tightly attached to the edge of the transmission rod 19, and the end of the swing rod 24 is not inserted into the docking port 23. At this time, the second elastic member 25 is in a state of deformation under force. When the button 13 is pressed, the front end 21 is forced to drive the transmission rod 19 to move in the direction of the position of the swing rod 24, and the transmission rod 19 will move in the direction of the resistance block 26. At this time, the first elastic member 22 is deformed under force, and the elastic force of the second elastic member 25 drives the swing rod 24 and the transmission rod 19 to be stuck in the docking port 23. At this time, the swing rod 24 is forced to rotate so that the resistance block 26 is disconnected from the resistance rack 20. At this time, the sliding rod 12 will be able to move, and the installation position of the head support plate 14 can be adjusted by pushing the sliding rod 12;

[0052] When the button 13 is released, the elastic recovery of the first elastic member 22 drives the transmission rod 19 to move in the direction of the button 13, and the swing rod 24 is pressed against the inner wall of the docking port 23 and pulled out from the inside thereof, so that one end of the swing rod 24 close to the docking port 23 abuts against the side wall of the transmission rod 19. At the same time, due to the force applied to one end of the swing rod 24, it rotates as a whole, and the end with the resistance block 26 will dock with the ruler tooth of the resistance rack 20, thereby limiting the movement of the sliding rod 12 and positioning the position of the head support plate 14.

[0053] See also Figure 1 and Figure 6A rotating ring 27 is fixedly connected to the top of the base 15, and the rotating ring 27 is rotatably connected to the rotating frame 11. A ray source 8 is fixedly connected to one side of the bottom of the rotating frame 11. A detector 9 is fixedly connected to the side of the bottom of the rotating frame 11 opposite to the ray source 8. The radioactive rays emitted by the ray source 8 can be detected and received by the detector 9.

[0054] It can be understood that the rotating frame 11 and the base 15 are rotatably connected via a rotating ring 27, and the rotating frame 11 and the frame 10 are also rotatably connected, and the radiation source 8 and the detector 9 are installed at the bottom of the rotatable rotating frame 11, and the specific positions of the radiation source 8 and the detector 9 can be adjusted by rotating the rotating frame 11 according to actual usage requirements.

[0055] See also Figure 1 and Figure 6 The top of the side connecting rod 2 is fixedly connected with a column 3, one side of the column 3 is fixedly connected with a transverse rotating shaft 16, one side of the transverse rotating shaft 16 is provided with a side rotating rod 5, the side rotating rod 5 is rotatably connected with the transverse rotating shaft 16, one end of the side rotating rod 5 away from the transverse rotating shaft 16 is fixedly connected with a short support rod 6, the jaw support 7 is fixedly connected with the top of the short support rod 6, the side rotating rod 5 rotates in a plane with the transverse rotating shaft 16 as the axis, and can be rotated to open the side rotating rod 5 before the detected object sits on the electric lifting seat 4 so that it does not hinder the detected object from sitting down. When the detected object sits down, force can be applied to the side rotating rod 5 to reset it;

[0056] The control unit includes a seat raising control button 17 and a seat lowering control button 18, both of which are electrically connected to the electric lift seat 4. An inclined plane is provided on the top of the column 3, and the seat raising control button 17 and the seat lowering control button 18 are fixedly arranged at the top of the inclined plane at equal distances. The lifting structure inside the electric lift seat 4 is the same as the lifting seat structure in the prior art. After the pitching condition of the head of the detected object is detected, the seat raising control button 17 and the seat lowering control button 18 can control the seat raising or lowering of the electric lift seat 4 according to the specific pitching condition of the head, thereby assisting the pitching condition of the head of the detected object to reach a qualified state;

[0057] The control unit also includes an image acquisition and processing module, an identification and positioning module, a connection line generation algorithm module, and a control logic and output module. The acquisition and processing module is used to extract the first feature and the second feature in the image captured by the camera, and pre-process the image, including denoising, contrast enhancement, distortion correction, etc., to improve the image quality; the identification and positioning module uses the image processing algorithm to identify and establish the camera image coordinate system; the connection line generation algorithm module designs an algorithm according to the relative position of the first feature and the second feature to generate a connection line between the first feature and the second feature; the control logic and output module converts the result of the connection line generation into a control signal for guiding image display, animation production or further data analysis, and outputs the connection line image or related data to a display, printer or storage device. Preferably, the display is placed in a position where the detected object can be clearly and completely observed, so that it can adjust the head pitch angle according to the output image data. It can be understood that the image processing is developed based on existing software development frameworks and image processing libraries such as OpenCV, MATLAB, etc. to reduce the difficulty of development and improve the maintainability of the code, and requires the support of hardware devices such as high-speed processors, large-capacity memory and high-speed storage devices to process large amounts of image data and complex algorithms.

[0058] It can be understood that the sliding rod 12 is threadedly connected with multiple positioning bolts, and the multiple positioning bolts are symmetrically arranged at equal distances. A plurality of threaded blind holes compatible with the positioning bolts are opened in the head support plate 14. The positioning bolts and the threaded blind holes are threadedly connected to fasten the sliding rod 12 and the head support plate 14. The head support plate 14 is fixed by the positioning bolts so that it can be disassembled. When the head support plate 14 is obviously worn and depreciated during long-term use, a spare head support plate 14 can be taken out by unscrewing the positioning bolts from the original head support plate 14 and removing it, and then screwing the positioning bolts into the spare head support plate 14 to complete the replacement of the head support plate 14.

[0059] See also Figure 8 , Fig. 9 and Fig.10, the first feature is the upper edge point of the ear canal on the side of the detected object, and the second feature is the lower edge point of the eye socket on the same side as the first feature of the detected object. If the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is less than 3°, it is considered that the pitch is qualified; if the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is higher than the lower edge point of the eye socket, it is judged to be lowering the head, and the control unit controls the electric lifting seat 4 to slowly descend until the pitch is qualified; if the angle between the first feature and the second feature connection line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is lower than the lower edge point of the eye socket, it is judged to be raising the head, and the control unit controls the electric lifting seat 4 to slowly rise until the pitch is qualified, and the actual first feature and second feature image data of the detected object collected by the camera are analyzed by the computer data processor and compared with the angle between the preset horizontal line in the camera image coordinate system, so as to obtain the actual head pitch of the detected object, and the preset horizontal line in the camera image coordinate system refers to the state that the preset first feature and the second feature are on the same horizontal line.

[0060] Working principle:

[0061] Before the detected object sits on the electric lift seat 4, the side swivel rod 5 is turned and opened so that it does not hinder the detected object from sitting down. After the detected object sits down, force can be applied to the side swivel rod 5 to reset it. After the detected object sits on the electric lift seat 4, the detected object supports the lower jaw on the top of the jaw rest 7, and the side face information of the detected object is collected by the camera to establish a camera image coordinate system and transmit it to the control unit. The control unit identifies the first feature and the second feature according to the side face information, and then establishes two feature connecting lines, and compares the connecting lines with the preset horizontal line in the camera image coordinate system to obtain the pitch information of the detected object's head. The first feature and the second feature connecting line are used as the reference for judgment. If the first feature If the angle between the second feature line and the preset horizontal line in the camera image coordinate system is less than 3°, the pitch is considered to be qualified; if the angle between the first feature and the second feature line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge of the ear canal is higher than the lower edge of the eye socket, it is judged to be lowering the head, and the control unit controls the electric lifting seat 4 to slowly descend until the pitch is qualified; if the angle between the first feature and the second feature line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge of the ear canal is lower than the lower edge of the eye socket, it is judged to be raising the head, and the control unit controls the electric lifting seat 4 to slowly rise until the pitch is qualified. In the initial state, the first elastic member 22 is in a normal state, and the button 13 is in the transmission slot. There is a gap between the walls, and the end of the swing rod 24 close to the docking port 23 is tightly attached to the edge of the transmission rod 19, and the end of the swing rod 24 is not inserted into the docking port 23. At this time, the second elastic member 25 is in a state of deformation under force. When the doctor presses the button 13, the front end 21 is forced to drive the transmission rod 19 to move in the direction of the swing rod 24, and the transmission rod 19 will move in the direction of the resistance block 26. At this time, the first elastic member 22 is deformed under force, and the elastic force of the second elastic member 25 drives the swing rod 24 and the transmission rod 19 to be stuck in the docking port 23. At this time, the swing rod 24 is forced to rotate to disconnect the resistance block 26 from the resistance rack 20. At this time, the sliding rod 12 will resume its movable state. After the doctor applies force to push the sliding rod 12 to move the head support plate 14 to a position that fits the back of the head of the subject to be tested, when the button 13 is released, the elastic recovery of the first elastic member 22 drives the transmission rod 19 to move in the direction of the button 13, and the swing rod 24 is relatively squeezed against the inner wall of the docking port 23 and pulled out from the inside thereof, so that the end of the swing rod 24 close to the docking port 23 is against the side wall of the transmission rod 19. At the same time, due to the force applied to one end of the swing rod 24, it rotates as a whole, and the end with the resistance block 26 will dock with the ruler tooth of the resistance rack 20, thereby limiting the movement of the sliding rod 12 and positioning the head support plate 14. The head of the subject to be tested can be positioned by using the combination of the head support plate 14 and the jaw support 7.

[0062] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A head positioning device for CBCT equipment, characterized in that: The invention comprises a base (1), the top of the base (1) is fixedly connected to an electric lifting seat (4) for adjusting the height position of the head of the detected object when sitting, the top of the base (1) is fixedly connected to a side connecting rod (2), the top of the side connecting rod (2) is provided with a jaw support (7) for supporting the lower jaw of the detected object, the top of the base (1) is fixedly connected to a frame (10), the end of the frame (10) away from the base (1) is rotatably connected to a rotating frame (11), the bottom of the rotating frame (11) is rotatably connected to a base (15), an adjustment opening is provided through the base (15), a sliding rod (12) is slidably connected in the adjustment opening, the end of the sliding rod (12) close to the frame (10) is fastened to a head support plate (14) for supporting and positioning the back of the head of the detected object, and a sliding resistance adjustment component for limiting its movement is provided in the sliding rod (12); It also includes a control unit and a camera fixedly connected to one side of the rotating frame (11). The camera collects the side face information of the detected object to establish a camera image coordinate system and transmits it to the control unit. The control unit identifies a first feature and a second feature based on the side face information and then establishes two feature connection lines. The first feature is the upper edge point of the ear canal on the side of the detected object, and the second feature is the lower edge point of the eye socket on the same side as the first feature of the detected object. The connection line is compared with a preset horizontal line in the camera image coordinate system to obtain the pitch information of the head of the detected object. The control unit controls the electric lifting seat (4) to rise or fall based on the pitch information of the head of the detected object. At this time, the chin of the detected object is against the fixed jaw support (7) to adjust the pitch angle of the detected object. The sliding resistance adjustment assembly comprises a button (13), a front end (21), a first elastic member (22), a transmission rod (19), a resistance rack (20), a docking port (23), a swing rod (24), a second elastic member (25) and a resistance block (26); a transmission groove adapted to the transmission rod (19) is provided through the sliding rod (12); the transmission rod (19) is slidably connected to the transmission groove; the button (13) is slidably connected to the notch of the transmission groove; the transmission rod (19) and the front end (21) are integrally formed; the front end (21) is fixedly connected to the button (13); a reset groove is provided at a position of the transmission rod (19) close to the front end (21); one end of the first elastic member (22) is fixedly connected to the reset groove; The first elastic member (22) is fixedly connected to the sliding rod (12), the other end of the first elastic member (22) is fixedly connected to the sliding rod (12), the swing rod (24) is rotatably connected in the sliding rod (12), one end of the second elastic member (25) is fixedly connected to the swing rod (24), the other end of the second elastic member (25) is fixedly connected to the sliding rod (12), the end of the transmission rod (19) close to the swing rod (24) is provided with a docking port (23) for inserting the swing rod (24), the resistance rack (20) is fixedly connected to the base (15) and arranged on the top of the swing rod (24), the resistance block (26) is fixedly connected to the end of the swing rod (24) away from the docking port (23), and the teeth of the resistance block (26) and the resistance rack (20) are in contact with each other.

2. A head positioning device for CBCT equipment according to claim 1, characterized in that: A rotating ring (27) is fixedly connected to the top of the base (15), and the rotating ring (27) is rotatably connected to the rotating frame (11). A ray source (8) is fixedly connected to one side of the bottom of the rotating frame (11), and a detector (9) is fixedly connected to the side of the bottom of the rotating frame (11) opposite to the ray source (8). The radioactive rays emitted by the ray source (8) can be detected and received by the detector (9).

3. A head positioning device for CBCT equipment according to claim 1, characterized in that: The top of the side connecting rod (2) is fixedly connected to a column (3), one side of the column (3) is fixedly connected to a transverse rotating shaft (16), one side of the transverse rotating shaft (16) is provided with a side rotating rod (5), the side rotating rod (5) is rotatably connected to the transverse rotating shaft (16), one end of the side rotating rod (5) away from the transverse rotating shaft (16) is fixedly connected to a short support rod (6), and the jaw support (7) is fixedly connected to the top of the short support rod (6).

4. A head positioning device for CBCT equipment according to claim 3, characterized in that: The control unit comprises a seat raising control button (17) and a seat lowering control button (18), and the seat raising control button (17) and the seat lowering control button (18) are both electrically connected to the electric lifting seat (4). An inclined plane is provided on the top of the column (3), and the seat raising control button (17) and the seat lowering control button (18) are fixedly arranged at an equal distance on the top of the inclined plane.

5. A head positioning device for CBCT equipment according to claim 1, characterized in that: The sliding rod (12) is internally threadedly connected with a plurality of positioning bolts, and the plurality of positioning bolts are symmetrically arranged at equal distances. The head support plate (14) is provided with a plurality of threaded blind holes adapted to the positioning bolts. The positioning bolts are threadedly connected to the threaded blind holes so that the sliding rod (12) and the head support plate (14) are fastened.

6. A positioning method for a head positioning device for CBCT equipment according to claim 1, characterized in that: If the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is less than 3°, the pitch is considered to be qualified; if the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is higher than the lower edge point of the eye socket, it is judged to be lowering the head, and the control unit controls the electric lifting seat (4) to slowly descend until the pitch is qualified; if the angle between the first feature and the second feature connecting line and the preset horizontal line in the camera image coordinate system is greater than or equal to 3°, and the height of the upper edge point of the ear canal is lower than the lower edge point of the eye socket, it is judged to be raising the head, and the control unit controls the electric lifting seat (4) to slowly rise until the pitch is qualified.

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