A multi-dimensional face information acquisition imaging device

Abstract

The utility model discloses a kind of multi-dimensional face information acquisition imaging equipment, imaging module includes U-shaped arm, ray source, detector, near-end camera, far-end camera;Positioning module includes seat, positioning cross arm, jaw support, side arm, head support assembly, seat has lifting mechanism, rotates swing cross arm to adjust jaw support position to reach to hold patient lower jaw or from patient lower jaw disengagement;Side arm lower end is installed on the lifting mechanism of seat, is driven and lifted with seat by lifting mechanism, head support assembly is installed on side arm, head support assembly is driven and lifted together, can be adapted to different size body type;Head support assembly includes variable force module, connecting rod, head support, connecting rod is used to connect variable force module and head support, variable force module is used to adjust the distance between head support and patient.

Description

Technical Field

[0001] This utility model belongs to the field of medical imaging, specifically, it relates to a multi-dimensional facial information acquisition and imaging device. Background Technology

[0002] With the development of medical diagnostic and treatment needs and technologies, there is an increasing need to fuse three-dimensional information about the internal tissue structure of the human body with three-dimensional information about the human surface to comprehensively and more accurately formulate and implement treatment plans. For the oral and maxillofacial region, image fusion of computed tomography (CT) data and three-dimensional facial data has gradually become an essential reference for diagnosis and treatment in orthodontics, aesthetic restoration, edentulous jaw implantation, and maxillofacial surgery.

[0003] To achieve the aforementioned fused images, there are generally two methods. One method involves performing CBCT and facial data captures under different conditions on a cone-beam computed tomography (CBCT) device, and then registering and fusing the facial and CT data. The other method involves capturing images on different devices: acquiring CT data on a CBCT device and facial information on a dedicated 3D facial scanner, and then fusing the two types of data.

[0004] The first method is based on CBCT equipment, which mainly uses X-ray imaging technology to achieve two-dimensional or three-dimensional imaging of the oral and maxillofacial region.

[0005] Current technology involves attaching one or more optical cameras to one end of the X-ray source or X-ray flat panel detector. A CBCT scan is performed during each imaging session. After the CBCT scan (or a 3D facial scan is performed first), the CBCT positioning device (chin rest) is removed, and a facial scanning positioning device is installed. After the patient is positioned, facial information is captured. This method requires two positioning devices, and the physician or patient needs to cooperate twice. If information about different facial states is needed, more imaging sessions are required. The obvious disadvantages are that it requires at least two imaging operations, low efficiency, and the need to design and manufacture different positioning devices, increasing costs.

[0006] The second method involves using a CBCT device and a dedicated 3D facial scanner to acquire CT data and 3D facial data respectively, and then fusing the two images.

[0007] 3D facial scanning and CBCT scanning are performed using two different devices. On the one hand, the equipment is expensive; on the other hand, the two imaging processes are completely independent, requiring two or more separate imaging locations and procedures. This necessitates more learning, operation, and consultation time for both doctors and patients, resulting in significant time and effort commitment. Furthermore, the data from both devices needs to be aggregated on a single workstation. Overall, this approach is costly and inefficient.

[0008] Therefore, both existing solutions have drawbacks in terms of cost, efficiency, and poor user experience.

[0009] In addition, most existing dental CBCT positioning devices use head fixation devices to hold and fix the head in position. However, head fixation devices can obstruct the acquisition of facial details, and the head fixation devices require the doctor to adjust and fix the patient's head. Although there are solutions that use a headrest to hold the back of the patient's head, this solution does not obstruct the patient's face, but the doctor needs to walk behind the patient to move the headrest, and after moving it into place, the screws need to be tightened to fix the headrest. Therefore, the operation of existing equipment is not convenient. Utility Model Content

[0010] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-dimensional facial information acquisition and imaging device.

[0011] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes: a multi-dimensional facial information acquisition and imaging device, comprising: The main support structure; The imaging module, which rotates to change the imaging angle and acquire rich information about the patient's face, includes a U-shaped arm, a radiation source, a detector, a near-end camera, and a far-end camera. The U-shaped arm is rotatably mounted on the main frame, with the radiation source and detector mounted at opposite ends. The radiation emitted by the radiation source can be detected and received by the detector. The axis of rotation of the U-shaped arm is located at a non-central position, creating an imaging space between the radiation source and detector to capture facial information and accommodate the patient's head. The radiation source and detector are positioned opposite each other and work together to acquire facial information. The near-end camera and far-end camera are mounted at opposite ends of the U-shaped arm. The near-end camera is located at the end of the U-shaped arm closest to the axis of rotation, used for close-up imaging of the patient's face within the imaging space. The far-end camera is located at the end of the U-shaped arm furthest from the axis of rotation, used for distant imaging of the patient's face within the imaging space. The positioning module includes a seat, a positioning arm, a chin rest, side arms, and a headrest assembly. The seat has a lifting mechanism that allows it to be raised and lowered. One end of the positioning arm is rotatably connected to the main frame. The chin rest is installed on the end of the positioning arm closest to the patient. Rotating the swing arm adjusts the position of the chin rest to support the patient's jaw or detach it from the patient's jaw. The lower end of the side arm is installed on the lifting mechanism of the seat and is raised and lowered along with the seat by the lifting mechanism. The headrest assembly is installed on the side arm and is also raised and lowered by the lifting mechanism. It can adapt to different body sizes, and the headrest can also be designed to be longer in height to accommodate different body sizes. The headrest assembly includes a force-changing module, a connecting rod, and a headrest. The connecting rod connects the force-changing module and the headrest. The force-changing module has two sections with different leads, distributed at both ends. The smaller lead is adjusted by applying more force, and the larger lead is adjusted by applying less force. Adjusting the larger lead changes the distance between the headrest connected to the connecting rod and the patient. The larger lead is closer to the doctor for easy adjustment.

[0012] In this invention, the headrest assembly is placed on the seat and rises and falls with the seat, achieving automatic separation of the chin support from the patient's chin without adding extra degrees of freedom, eliminating the need for secondary manual operation by the doctor.

[0013] In this invention, at least two sets of cameras are arranged, one near-end and one far-end. The far-end camera has a larger field of view and can image the entire face; the near-end camera has a smaller field of view and only images the key areas. The near-end and far-end cameras work together to achieve better detail clarity. By fusing the two sets of images, the shortcomings of the far-end camera in imaging the key areas are compensated for.

[0014] Furthermore, the variable force module includes a module base, a main slider, a variable force screw, a secondary slider, a damping ring, and a handle. The main slider and the secondary slider are both inside the module base and are slidably connected to the module base. The inner ring of the damping ring is fixedly connected to the variable force screw, and the outer ring of the damping ring is fixedly connected to the module base. When the inner and outer rings of the damping ring rotate relative to each other, they have a certain resistance. When the variable force screw rotates, the damping ring has a resistance effect on the rotation of the variable force screw. The variable force screw has two sections with the same direction of rotation but different leads, which are distributed at both ends, and the damping ring is located between the two sections. The main slider and the section of the variable force screw with a larger lead form a helical drive, while the secondary slider and the other section of the variable force screw with a smaller lead form a helical drive. The handle is fixedly connected to the main slider, and one end of the connecting rod is fixedly connected to the secondary slider. The main slider has low resistance and can be easily adjusted by the doctor, allowing the headrest to be moved closer to or away from the patient's head. However, the secondary slider, which is closer to the patient's head, is more difficult to move due to its greater resistance. The modular base has a strip-shaped through hole that allows the handle to move. The portion of the handle located outside the strip-shaped through hole, i.e., at one end of the modular base, is enlarged to facilitate user grip. This design avoids the use of screw tightening operations found in existing technologies, making it simple and convenient to adjust the headrest position.

[0015] Furthermore, it also includes rolling bearings. The variable force screw is rotatably connected to the module base through rolling bearings. By the rolling motion of the rolling elements between the inner and outer rings, the sliding friction between the shaft and the module base is transformed into rolling friction, which can reduce the coefficient of friction and greatly reduce energy loss.

[0016] Furthermore, the positioning arm is connected to the main frame via a torsion spring. The positioning arm and the main frame have two states: attracted and open. The attracted state is achieved by magnetic attraction. When the positioning arm is pulled away from the attracted state, the magnetic force no longer applies, and the torsion spring opens the positioning arm.

[0017] Furthermore, the magnets are made of magnets that attract opposite poles or are made using magnets and magnetized metals.

[0018] Furthermore, the radiation source and detector are respectively installed at both ends of the U-shaped arm, the near-end camera and the far-end camera are respectively installed at both ends of the U-shaped arm, and the pivot connecting the crossbeam and the U-shaped arm is located on the side of the U-shaped arm away from the far-end camera.

[0019] Furthermore, the near-end camera and detector are located at the end closer to the U-shaped arm pivot, while the far-end camera and radiation source are located at the end farther from the U-shaped arm pivot.

[0020] Furthermore, a linear motion mechanism is provided between the pivot of the U-shaped arm and the U-shaped arm.

[0021] Furthermore, the main frame includes a base, a column, and a crossbeam. The column is installed on the base, one end of the crossbeam is fixed to the column, the U-shaped arm rotates under the crossbeam, and one end of the positioning crossbeam is rotatably connected to the column.

[0022] Compared with the prior art, the advantages of this utility model include: (1) The present invention provides a multi-dimensional facial information acquisition and imaging device. The imaging module can capture both visible light imaging and CBCT imaging. Compared with the traditional method of manually removing the jawbone after CBCT imaging and then performing visible light imaging, the present invention performs X-ray imaging and visible light imaging simultaneously within a traditional CBCT imaging cycle. This not only shortens the data acquisition time and improves efficiency, but also reduces the workload of doctors.

[0023] (2) The multi-dimensional facial information acquisition and imaging device provided by this utility model achieves automatic separation of the patient's chin from the chin support by adjusting the installation position of the chin support without adding extra degrees of freedom, using the original seat lifting mechanism. The cost is not increased while the function is increased.

[0024] (3) The multidimensional facial information acquisition imaging device provided by this utility model has a variable force mechanism in the patient head support component. It not only places the operating handle in front of the patient for the doctor to operate, but also realizes the simple pushing of the handle to move the head support. The head support side away from the handle is more difficult to move, which has a certain self-locking effect on fixing the patient's head.

[0025] (4) The present invention provides a multi-dimensional facial information acquisition and imaging device, which is equipped with at least two sets of cameras at the near end and the far end. The far end camera has a larger field of view and can image the entire face; the near end camera has a smaller field of view and only images the key areas, which has better detail clarity. The two sets of images are fused to make up for the lack of detail in the key areas of the far end camera. At the same time, the use of a large field of view lens at the near end is avoided, which avoids large distortion and improves the imaging accuracy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an overall schematic diagram of a multi-dimensional facial information acquisition and imaging device according to the present invention; Figure 2 This is a three-dimensional schematic diagram of the headrest component of a multi-dimensional facial information acquisition and imaging device according to this utility model; Figure 3 This is a top view schematic diagram of the headrest assembly of a multi-dimensional facial information acquisition and imaging device according to this utility model; Figure 4 This invention relates to a multi-dimensional facial information acquisition and imaging device. Figure 3 A schematic diagram of the AA cross-section; Figure 5 This is a schematic diagram of the horizontal arm of a multi-dimensional facial information acquisition and imaging device of this utility model being extended. Figure 6 This is a side view schematic diagram of a multi-dimensional facial information acquisition and imaging device according to the present invention; Figure 7 This is a schematic diagram of a patient using a multi-dimensional facial information acquisition and imaging device according to this utility model; Figure 8 A schematic diagram of existing technology for obscuring the face; Figure 9 This is a schematic diagram of an existing technology that requires adjustment by a doctor.

[0028] Figure label: 11. Main frame; 12. Base; 13. Column; 14. Crossbeam; 15. Imaging module; 16. U-shaped arm; 17. X-ray source; 18. Detector; 19. Near-end camera; 20. Far-end camera; 21. Positioning module; 22. Seat; 23. Positioning cross arm; 24. Chin rest; 25. Side arm; 26. Headrest assembly; 27. Handle; 28. Variable force module; 29. ​​Connecting rod; 30. Headrest; 31. Module base; 32. Main slider; 33. Variable force screw; 34. Secondary slider; 35. Rolling bearing; 36. Damping ring; 37. Strip-shaped through hole; 38. Magnetic sheet. Detailed Implementation

[0029] In view of the shortcomings of the prior art, the inventor of this utility model has, through long-term research and extensive practice, proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.

[0030] 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 should not be construed as limiting the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0032] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0033] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0034] This utility model embodiment is intended to introduce and explain the structural composition of a multi-dimensional facial information acquisition and imaging device and the cooperation relationship between the various components. Unless otherwise specified, the size, material, and manufacturing process of each component in the multi-dimensional facial information acquisition and imaging device in this utility model embodiment can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0035] Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail in the following description. However, those skilled in the art can fully understand this utility model even without these detailed descriptions.

[0036] Example 1 Please see Figure 1 and Figure 2 A multi-dimensional facial information acquisition and imaging device, comprising: Main frame 11, the main supporting structure; The imaging module 15 is rotatable to change the imaging angle and acquire rich information about the patient's face. It includes a U-shaped arm 16, a radiation source 17, a detector 18, a near-end camera 19, and a far-end camera 20. The U-shaped arm 16 is rotatably mounted on the main frame 11. The radiation source 17 and detector 18 are respectively mounted at both ends of the U-shaped arm 16. The radioactive rays emitted by the radiation source can be detected and received by the detector. Preferably, the radiation source 17 and detector 18 correspond to an X-ray source and an X-ray flat panel detector. The rotation axis of the U-shaped arm 16 is located at a non-central position. There is a shooting space between the X-ray source 17 and the detector 18 for capturing the patient's facial information. The shooting space is also a space for accommodating the patient. The X-ray source 17 and the detector 18 are set opposite to each other and cooperate to acquire the patient's facial information. The near-end camera 19 and the far-end camera 20 are respectively installed at both ends of the U-shaped arm 16. The near-end camera 19 is set at the end of the U-shaped arm 16 near the pivot of the U-shaped arm 16 and is used to capture the patient's facial information in the shooting space at close range. The far-end camera 20 is set at the end of the U-shaped arm 16 away from the pivot of the U-shaped arm 16 and is used to capture the patient's facial information in the shooting space at a distance. The positioning module 21 includes a seat 22, a positioning cross arm 23, a chin rest 24, a side arm 25, and a headrest assembly 26. The seat 22 has a lifting mechanism, preferably an electric lifting mechanism. One end of the positioning cross arm 23 is rotatably connected to the main frame 11. The chin rest 24 is installed on the end of the positioning cross arm 23 closest to the patient. Rotating the swinging cross arm adjusts the position of the chin rest 24 to support the patient's chin or detach it from the patient's chin. The lower end of the side arm 25 is installed on the lifting mechanism of the seat 22 and is driven by the lifting mechanism to rise and fall together with the seat 22. The headrest assembly 26 is installed on the side arm 25 and is driven to rise and fall together with the side arm 25. It can adapt to different body sizes. Alternatively, the headrest 30 can be designed to be longer in height to adapt to different body sizes. The headrest assembly 26 includes a force-changing module 28, a connecting rod 29, and a headrest 30. The connecting rod 29 is used to connect the force-changing module 28 and the headrest 30. The connecting rod 29 is L-shaped. The force-changing module 28 has two sections with different leads, distributed at both ends. The smaller lead is adjusted by applying more force, and the larger lead is adjusted by applying less force. Adjusting the larger lead changes the distance between the headrest 30 connected to the connecting rod and the patient. The larger lead is closer to the doctor for easy adjustment.

[0037] In this invention, the headrest assembly 26 is arranged on the seat 22 and rises and falls with the seat 22, achieving automatic separation of the chin support 24 from the patient's chin without adding extra degrees of freedom, eliminating the need for secondary manual operation by the doctor.

[0038] A method for using a multi-dimensional facial information acquisition and imaging device includes the following steps: Step 1: Rotate the U-shaped arm 16 to the swing position angle and open the swing position horizontal arm 23; Step 2: After guiding the patient to sit under the seat 22, perform the positioning operation. Push the positioning arm 23 to the closed state, and at the same time adjust the height of the seat 22 so that the patient's chin rests on the chin support 24 and the patient's head is roughly vertical. Then pull the head support assembly 26 to move the head support 30 towards the back of the patient's head until it touches the back of the patient's head. After confirming that the patient's head is positioned by the chin support 24 and the head support 30, release the handle 27. Step 3: The U-shaped arm 16 rotates in the forward direction and performs CBCT imaging, while simultaneously performing visible light camera imaging. Step 4: After the CBCT scan is completed, the seat 22 is adjusted and raised to separate the patient's chin from the jaw support 24; Step 5: The U-shaped arm 16 rotates back to the starting angle in the opposite direction, and during this process, the patient's face is imaged by a visible light camera. Step 6: Shooting complete, U-shaped arm 16 returns to the starting position; Step 7: The operator pulls open the positioning arm 23, and the patient gets up and leaves the device.

[0039] Example 2 Please see Figures 1-7 A multi-dimensional facial information acquisition and imaging device, comprising: The main frame 11 includes a base 12, a column 13, and a crossbeam 14. The column 13 is fixed to the base 12, and one end of the crossbeam 14 is fixed to the column 13. The base 12 and the crossbeam 14 are generally arranged horizontally, and the column 13 is generally arranged vertically. The imaging module 15 is U-shaped and rotatably connected to one end of the crossbeam 14. The imaging module 15 rotates around the X-axis. Specifically, it includes a U-shaped arm 16, a radiation source 17, a detector 18, a near-end camera 19, and a far-end camera 20. The radiation source 17 and the detector 18 are fixedly installed at both ends of the U-shaped arm 16. The near-end camera 19 is installed at the detector end, which is closer to the axis of rotation of the U-shaped arm 16, and the far-end camera 20 is installed at the radiation source end, which is farther from the axis of rotation of the U-shaped arm 16. The near-end camera 19 has a smaller field of view, capturing the area of ​​the patient's face from the bottom of the chin to the area near the nose. The far-end camera has a larger field of view, capturing the entire facial information of the patient.

[0040] The positioning module 21 includes a seat 22, a positioning arm 23, a chin rest 24, a side arm 25, and a headrest assembly 26. The headrest assembly 26 is used to support the back of the patient's head. The bottom of the seat 22 is fixed to the base 12. The seat 22 has a lifting mechanism, preferably an electric lifting mechanism, which can be electrically driven to lift and lower. One end of the positioning arm 23 is rotatably connected to the column 13, and the rotation axis of the positioning arm 23 rotates around the Y-axis. The chin rest 24 is installed at the other end of the positioning arm 23. The lower end of the side arm 25 is fixedly installed on the liftable part of the seat 22. The lifting and lowering of the seat 22 drives the lifting and lowering of the side arm 25. The patient's headrest assembly 26 is fixedly installed on the upper end of the side arm 25.

[0041] The head support assembly 26 consists of a handle 27, a variable force module 28, a connecting rod 29, and a head support 30. The variable force module 28 mainly consists of a module base 31, a main slider 32, a variable force screw 33, a secondary slider 34, a rolling bearing 35, a damping ring 36, and a handle 27. The main slider 32 and the secondary slider 34 are slidably connected to the module base 31. The variable force screw 33 is rotatably connected to the module base 31 through the rolling bearing 35. The variable force screw 33 has two sections with the same direction of rotation but different leads, distributed at both ends. The damping ring 36 is located at the center position between the leads of the two ends.

[0042] The main slider 32 and the section of the variable force screw 33 with a larger lead form a helical drive, and the secondary slider 34 and the other section of the variable force screw 33 with a smaller lead form a helical drive. The handle 27 is fixedly connected to the main slider 32. The module base 31 has a strip-shaped through hole 37 that allows the handle 27 to move. One end of the connecting rod 29 is fixedly connected to the secondary slider 34, and the other end is fixedly connected to the head support 30. The inner ring of the damping ring 36 is fixedly connected to the variable force screw 33, and the outer ring is fixedly connected to the module base 31. The inner and outer rings provide resistance when rotating relative to each other. When the variable force screw 33 rotates, the damping ring 36 provides resistance to its rotation. The presence of the damping ring 36 can effectively adjust the ease of rotation of the variable force screw 33, making the force output more stable. Preferably, the rolling bearing 35 and the damping ring 36 are placed adjacent to each other.

[0043] The positioning arm 23 is rotatably connected to the column 13, and has two states: engaged and open. Engagement is achieved through magnetic force. The magnetic plates 38 with mutual attraction can be made of opposite magnets, or of magnets and easily magnetized metals. When engaged, the side of the positioning arm 23 is attached to the side of the column 13, and the positioning arm 23 is roughly parallel to the crossbeam 14. The attraction force should be sufficient to allow a normal adult to pull the positioning arm 23 open by holding it firmly with one hand at the end near the chin rest 24. When the positioning arm 23 is pulled open from the engaged state, the magnetic force ceases to act. Upon releasing the hand, the positioning arm 23 will continue to rotate outward under the action of a torsion spring arranged within the pivot until it reaches its limit, thus entering the open state.

[0044] refer to Figure 1 , Figure 7 A method for using a multi-dimensional facial information acquisition and imaging device. Step 1: Rotate the U-shaped arm 16 to the swing position angle and open the swing position horizontal arm 23; Step 2: After guiding the patient to sit under the seat 22, perform the positioning operation. Push the positioning arm 23 to the closed state, and at the same time adjust the height of the seat 22 so that the patient's chin rests on the chin support 24 and the patient's head is roughly vertical. Then pull the head support assembly 26 to move the head support 30 towards the back of the patient's head until it touches the back of the patient's head. After confirming that the patient's head is positioned by the chin support 24 and the head support 30, release the handle 27. Step 3: The U-shaped arm 16 rotates in the forward direction and performs CBCT imaging, while simultaneously performing visible light camera imaging. Step 4: After the CBCT scan is completed, the seat 22 is adjusted and raised to separate the patient's chin from the jaw support 24; Step 5: The U-shaped arm 16 rotates back to the starting angle in the opposite direction, and during this process, the patient's face is imaged by a visible light camera. Step 6: Shooting complete, U-shaped arm 16 returns to the starting position; Step 7: The operator pulls open the positioning arm 23, and the patient gets up and leaves the device.

[0045] Understandably, the CBCT scan repositioning (reversal) motion process was used to scan facial information in a natural state. This not only did not increase the shooting time, but also solved the problem of facial details changing shape when the head is fixed. It combined the two shootings of the existing technology into one shooting, improving efficiency, increasing functionality, and reducing the cost of hardware equipment.

[0046] Working principle: For example, the force-changing principle of the force-changing module of this utility model is as follows: Apply minimum to the main slider A force of a certain magnitude can achieve its linear movement; the main slider moves via a lead. The screw drive of the main slide block rotates, and the rotation of the screw synchronously causes the secondary slide block to move linearly in the same direction as the main slide block. A minimum force is applied to the secondary slide block. A force of a certain magnitude can achieve its linear movement; the secondary slider moves through the lead. The screw drive of the segment drives the lead screw to rotate, and the rotation of the lead screw synchronously drives the main slider to move linearly, and the direction of movement is the same as that of the secondary slider.

[0047] The relationship between the thrust F applied to the nut and the torque T generated by the screw in a lead screw-nut drive with lead R is as follows: in For transmission efficiency.

[0048] Since the two sections of the variable-force screw with different leads use the same manufacturing process and have similar lubrication conditions, their transmission efficiency can be considered to be the same. Therefore, the resistance overcome by driving the main slider and the secondary slider to move can also be considered to be the same. Neglecting the frictional resistance of the bearing rolling, the resistance torque applied by the damping ring to the screw is... ,but: like ,but That is, different driving forces for the main slider and the secondary slider can be achieved by configuring the lead size of the two sections of the variable force screw.

[0049] By fixing a slider that requires a large driving force to move to the headrest, and fixing a slider that requires a small driving force to move to the handle, the headrest can be moved back and forth by pulling the handle with a small force, while the patient needs to use a large force to move the headrest. This is beneficial for stabilizing the patient's head.

[0050] Calculation example: Ignoring sliding friction resistance of the slider and rotational friction resistance of the rolling bearing, the resistance torque exerted by the damping ring on the leadscrew is: , The push required to move the headrest by the main slider handle The calculation is as follows: The thrust required to move the headrest directly via the secondary slider or headrest. The calculation is as follows: like ,but .

[0051] In this way, not only are the operating handles placed in front of the patient for the doctor's convenience, but the headrest can also be moved easily on the handle side and more difficult on the headrest side, thus providing a certain self-locking effect for fixing the patient's head.

[0052] It should be understood that the above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. It should not be considered that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A multidimensional facial information acquisition and imaging device, comprising a main frame and an imaging module on the main frame, wherein the imaging module includes a radiation source and a detector for cooperating to acquire facial information of a patient, characterized in that, Also includes: It also includes a near-end camera and a far-end camera, which are respectively installed beside the X-ray source and the detector. The imaging module can drive and adjust the position of the X-ray source and the detector. The near-end camera is used to capture the patient's facial information at close range within the imaging space, and the far-end camera is used to capture the patient's facial information at a distance within the imaging space. The positioning module includes a seat, a positioning arm, a chin rest, side arms, and a headrest assembly. The seat has a lifting mechanism. One end of the positioning arm is rotatably connected to the main frame. The chin rest is installed on the end of the positioning arm closest to the patient. Rotating the swing arm adjusts the position of the chin rest to support the patient's chin or detach it from the patient's chin. The lower end of the side arm is installed on the lifting mechanism of the seat and is lifted and lowered together with the seat by the lifting mechanism. The headrest assembly is installed on the side arm. The headrest assembly includes a force-changing module, a connecting rod, and a headrest. The connecting rod connects the force-changing module and the headrest. The force-changing module has two sections with different leads, distributed at both ends. The smaller lead is adjusted by applying a stronger force, and the larger lead is adjusted by applying a weaker force. Adjusting the larger lead changes the distance between the headrest connected to the connecting rod and the patient.

2. The multi-dimensional facial information acquisition and imaging device according to claim 1, characterized in that: The variable force module includes a module base, a main slider, a variable force screw, a secondary slider, a damping ring, and a handle. The main slider and the secondary slider are both inside the module base and are slidably connected to the module base. The inner ring of the damping ring is fixedly connected to the variable force screw, and the outer ring of the damping ring is fixedly connected to the module base. The inner and outer rings of the damping ring have a certain resistance when they rotate relative to each other. When the variable force screw rotates, the damping ring provides resistance to the rotation of the variable force screw. The variable force screw has two sections with the same direction of rotation but different leads, and is distributed at both ends. The main slider and the section of the variable force screw with a larger lead form a helical drive, and the secondary slider and the other section of the variable force screw with a smaller lead form a helical drive; the handle is fixedly connected to the main slider, one end of the connecting rod is fixedly connected to the secondary slider, and the module base has a strip-shaped through hole that allows the handle to move; the variable force screw is rotatably connected to the module base.

3. The multi-dimensional facial information acquisition and imaging device according to claim 2, characterized in that: It also includes rolling bearings, and the variable force screw is rotatably connected to the module base through rolling bearings.

4. The multi-dimensional facial information acquisition and imaging device according to claim 1, characterized in that: The positioning arm is connected to the main frame via a torsion spring. The positioning arm and the main frame have two states: attracted and open. In the attracted state, the positioning arm is pulled away by magnetic attraction, and the magnetic force no longer applies. The torsion spring opens the positioning arm.

5. The multi-dimensional facial information acquisition and imaging device according to claim 4, characterized in that: The magnetic force is made of magnets that attract opposite poles or is made using magnets and magnetized metals.

6. The multi-dimensional facial information acquisition and imaging device according to claim 1, characterized in that: The imaging module also includes a U-shaped arm rotatably connected to the main frame. The X-ray source and detector are respectively installed at both ends of the U-shaped arm. The near-end camera and the far-end camera are respectively installed at both ends of the U-shaped arm. The rotating shaft connected to the U-shaped arm is located on the side of the U-shaped arm away from the far-end camera.

7. A multi-dimensional facial information acquisition and imaging device according to claim 6, characterized in that: The near-end camera and detector are located at the end closer to the U-shaped arm pivot, while the far-end camera and radiation source are located at the end farther from the U-shaped arm pivot.

8. The multi-dimensional facial information acquisition and imaging device according to claim 7, characterized in that: A linear movement mechanism is also provided between the pivot of the U-shaped arm and the U-shaped arm.

9. A multi-dimensional facial information acquisition and imaging device according to claim 6, characterized in that: The main frame includes a base, a column, and a crossbeam. The column is installed on the base, one end of the crossbeam is fixed to the column, the U-shaped arm rotates under the crossbeam, and one end of the positioning cross arm is rotatably connected to the column.

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