Digitized medical X-ray photography regulation and control method and system

Abstract

The invention discloses a digital medical X-ray photography regulation and control method and system, and relates to the technical field of medical imaging. The dental film machine comprises a machine body, a display screen, a first camera, a balance assembly and a distance measuring unit, the display screen and the first camera are installed on the machine body, a lens of the first camera faces the patient, and the detection end of the distance measuring unit faces the background plate and is used for detecting the distance between the detection end of the dental film machine and the background plate; the number of the distance measuring units is three, and the distance measuring units are integrated in the balance assembly. The control module is electrically connected to the display screen, the camera I and the distance measuring unit; the control module is configured to obtain distance detection values fed back by the three distance measurement units if the current state of the dental film machine accords with a preset radiation projection state; and calculating the angle between the detection central axis of the dental film machine and the plane where the cross reference line is located based on the distance detection value, and displaying the angle on a display screen. The use effect of the handheld dental film machine can be improved.

Description

Technical Field

[0001] The present application relates to the field of medical imaging technology, and in particular to a digital medical X-ray photography control method and system. Background Art

[0002] At present, medical X-ray imaging has been widely used in clinical practice. X-ray diagnosis uses the principle that X-rays have different penetration rates into different tissues and organs of the human body to form images that match the density of the human body's internal structure, thereby helping doctors diagnose the disease and improve the effectiveness of disease diagnosis and treatment.

[0003] X-ray imaging diagnosis usually includes diagnosis based on the results of X-ray photography (such as film), X-ray fluoroscopy (such as chest X-ray, gastrointestinal radiography), computer tomography (CT), dental X-ray photography (such as dental films, panoramic machines, oral CT), breast X-ray photography (such as molybdenum target films), etc.

[0004] Among them, in addition to using traditional panoramic dental X-ray equipment to take dental film image data, it is currently also possible to use a handheld dental film machine to take pictures and obtain it. During the use of the handheld dental film machine, medical staff are required to manually adjust the angle between the dental film machine's detection center axis and the patient's tooth position according to the standardized digital dental film projection angle. This may result in poor quality of the dental film due to inaccurate projection angle. Therefore, the present application proposes a new technical solution. Summary of the invention

[0005] In order to improve the use effect of a handheld dental radiograph, the present application provides a digital medical X-ray photography control method and system.

[0006] In the first aspect, the present application provides a digital medical X-ray photography control system, which adopts the following technical solution:

[0007] A digital medical X-ray photography control system, including a dental film machine, a background plate and a control module;

[0008] The background plate is used to be placed behind the patient in a vertical posture, and a cross reference line and a head outline are provided on a side of the background plate facing the patient, and the cross reference line and the head outline have the same center point;

[0009] The dental film machine comprises a body, a display screen, a camera 1, a balance component and a distance measuring unit. The display screen and the camera 1 are mounted on the body, and the lens of the camera 1 faces the patient. The detection end of the distance measuring unit faces the background plate and is used to detect the distance between the detection end of the dental film machine and the background plate. Three distance measuring units are provided and integrated in the balance component. The balance component is used to keep the detection end of the distance measuring unit horizontal. The balance component is mounted on the end of the detection end of the body.

[0010] The control module is electrically connected to the display screen, the camera 1 and the distance measuring unit;

[0011] The control module is configured as follows:

[0012] If the current state of the dental radiograph meets the preset radiation projection state, the distance detection values ​​fed back by the three distance measuring units are obtained;

[0013] The angle between the central axis of the dental film machine and the plane where the cross reference line is located is calculated based on the distance detection value, and displayed on the display screen.

[0014] Optionally, the background board is an electronic screen, which is electrically connected to a control module. The control module is configured to adjust the position and size of the head outline and the position of the cross reference line and display the electronic screen if a background adjustment instruction is received.

[0015] Optionally, the electronic screen is electrically connected to a second camera, the second camera is located above the electronic screen and its lens is set toward the patient, the second camera is electrically connected to a control module, and the control module is configured as follows:

[0016] Obtain image information fed back by camera 2, and perform human body recognition processing based on the image information to obtain the patient's height and head size information;

[0017] Based on the patient's height and head size information, the position and size of the head contour line and the position of the cross reference line that are suitable for the current patient are determined and displayed on the electronic screen.

[0018] Optionally, the body is integrated with an interaction unit, the interaction unit is electrically connected to the control module, the interaction unit includes an audio pickup and playback unit, and the control module is configured as follows:

[0019] If the demand information received from the interaction unit meets the predefined shooting process guidance conditions, a matching guidance prompt is output based on the pre-stored digital dental film projection angle rule, and the guidance prompt includes guidance voice and / or text.

[0020] Optionally, the end of the detection end of the body is detachably provided with an assembly ring, the outer diameter of the assembly ring is larger than the patient's head contour, the balance assembly is installed on the assembly ring, and the control module is configured to: if a cross reference line initialization calibration completion signal is received, it is determined that the current state of the dental film machine meets the preset radiation exposure state.

[0021] Optionally, the control module is configured as:

[0022] If a cross reference line initialization calibration completion signal is received, a virtual background image is generated and displayed on the electronic screen, wherein the virtual background image includes a cross reference line and a head outline;

[0023] Obtain the movement state and swing angle of the patient's head, and control the virtual background image to follow and adjust.

[0024] Optionally, it further includes a headband and a posture sensing unit, wherein the headband is used to be worn on the patient's head, the posture sensing unit is built into the headband, the control module is electrically connected to the posture sensing unit, and the control module is configured as follows:

[0025] Acquire the perception signal fed back by the posture perception unit;

[0026] Based on the sensing signals, the movement state and swing angle of the patient's head are determined.

[0027] Optionally, the balancing assembly includes a fixing frame, a support one, a support two and a balancing ball, the fixing frame having a U-shaped cross-section and fixedly connected to the outside of the assembly ring, the support one being fixed to the inner wall of the upper end of the fixing frame, the support two being fixed to the inner wall of the lower end of the fixing frame, the balancing ball being located between the support one and the support two, the support one being coaxial with the support two and the axis extending along the central axis of the balancing ball, the support one and the support two being provided with arcuate surfaces at one end facing the balancing ball, which fit the upper and lower spherical surfaces of the balancing ball, the arcuate surfaces and the spherical surfaces of the balancing ball being both configured to be smooth surfaces, the balancing ball being provided with a groove along its radial direction for embedding and installing a distance measuring unit, and the distance measuring unit being embedded at the center of the balancing ball.

[0028] In a second aspect, the present application provides a digital medical X-ray photography control method, which adopts the following technical solution:

[0029] The digital medical X-ray photography control method uses any of the digital medical X-ray photography control systems described above to photograph the patient's teeth.

[0030] In summary, the present application includes the following beneficial technical effects: it enables medical staff to more intuitively see the angle between the central axis of the dental film machine and the plane where the cross reference line is located, that is, the angle between the central axis of the dental film machine and the patient's tooth position, so that they can quickly adjust to achieve a more accurate projection angle, thereby obtaining better quality dental films and improving the use effect of the handheld dental film machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the structure of the system of an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the structure of the control module in the embodiment of the present application;

[0033] Figure 3 It is a structural schematic diagram of a dental film machine in an embodiment of the present application;

[0034] Figure 4 is a schematic diagram of the structure of the balancing component in an embodiment of the present application;

[0035] Figure 5 This is an example diagram of angle calculation in an embodiment of the present application.

[0036] Explanation of the accompanying reference numerals: 1. electronic screen; 2. dental film machine; 3. control module; 21. body; 22. display screen; 23. camera 1; 24. balance component; 25. distance measuring unit; 26. assembly ring; 241. fixing frame; 242. support 1; 243. support 2; 244. balancing ball; 245. groove; 4. camera 2; 5. interaction unit; 6. posture sensing unit. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a digital medical X-ray photography control system.

[0039] Reference Figure 1 and Figure 2 The digital medical X-ray photography control system includes a background plate, a dental film machine 2 and a control module 3. The background plate is vertically installed on the wall behind the patient, and the background plate is provided with a cross reference line and a head contour line, wherein the cross intersection of the cross reference line is located at the center of the head contour line.

[0040] Reference Figure 2 and Figure 3 The dental film machine 2 includes a body 21, a display screen 22, a camera 23, a balancing component 24 and a ranging unit 25. The camera 23 is fixedly mounted on the body 21, and the lens of the camera 23 faces the direction of the detection end of the body 21. The display screen 22 is integrated on the upper surface of the body 21 and at one end close to the medical staff, and the power supply circuit of the display screen 22 is integrated in the battery module inside the body 21 of the dental film machine 2.

[0041] The distance measuring unit 25 can be a distance measuring sensor, which is used to detect the distance between the detection end of the dental film machine 2 and the background plate. Three distance measuring units 25 are set and integrated in the balance component 24. The balance component 24 is used to keep the detection end of the distance measuring unit 25 in a horizontal state at all times. The balance component 24 is installed on the end of the detection end of the body 21 by connecting the assembly ring 26, and the assembly ring 26 is detachably mounted on the end of the detection end of the body 21 through a thread.

[0042] Reference Figure 3 and Figure 4 The balancing assembly 24 includes a fixing frame 241, a support 1 242, a support 243 and a balancing ball 244. The fixing frame 241 is in a U-shaped cross section and is bonded to the outside of the assembly ring 26. The support 1 242 is fixed to the inner wall of the upper end of the fixing frame 241, and the support 243 is fixed to the inner wall of the lower end of the fixing frame 241. The balancing ball 244 is located between the support 1 242 and the support 2 243. The positions of the support 1 242 and the support 2 243 are aligned and coaxial, and the axis extends along the central axis of the balancing ball 244. The support 1 242 and the support 2 243 face the inner wall of the balancing ball 244. The end portions are both provided with arc surfaces, and the arc surfaces of the support 1 242 and the support 2 243 are respectively fitted with the upper and lower spherical surfaces of the balancing ball 244, and the arc surfaces and the spherical surface of the balancing ball 244 are both set to be smooth surfaces, and the balancing ball 244 is provided with a groove 245 for the embedding and installation of the distance measuring unit 25 along its radial direction. The distance measuring unit 25 is installed at the center of the balancing ball 244 through the groove 245, and the balance can be achieved by adjusting the nut position of the distance measuring unit 25 (the nut provided on the distance measuring sensor), so that when the medical staff swings the dental film machine 2 up and down, the distance measuring unit 25 always remains in a horizontal state for detection.

[0043] Secondly, the number of the above-mentioned balancing components 24 is also three, each balancing component 24 fixes a distance measuring unit 25, and the three balancing components 24 are evenly distributed in three equal parts along the circumference of the mounting ring 26, and the angle formed by the lines connecting the centers of the three balancing components 24 and the mounting ring 26 is 120 degrees. At the same time, in order to prevent the patient's head from blocking the signal of the distance measuring unit 25 during the measurement process, the outer diameter of the mounting ring 26 is larger than the contour of the patient's head.

[0044] Reference Figure 2 , wherein the control module 3 includes a control mainboard integrated with a communication unit, the control mainboard is electrically connected to the control mainboard of the dental film machine, and the control module 3 is respectively connected to the display screen 22, the camera 23 and the distance measuring unit 25, then on the basis of the above, the control module 3 is configured as follows:

[0045] If the current state of the dental film machine 2 meets the preset radiation projection state, the distance detection values ​​fed back by the three distance measuring units 25 are obtained;

[0046] The angle between the detection center axis of the dental film machine 2 and the plane where the cross reference line is located is calculated based on the distance detection value, and the display screen 22 is displayed.

[0047] It can be understood that by obtaining the distance detection values ​​fed back by the three distance measuring units 25, the angle between the detection center axis of the dental film machine 2 and the plane where the cross reference line is located can be calculated through trigonometric functions, and the calculated angle is sent to the display screen 22 for direct display.

[0048] Reference Figure 5 , the above angle calculation example:

[0049] The distance values ​​fed back by the three distance measuring units 25 are defined as d1, d2 and d3 (d1 is fed back by the distance measuring unit 25 located at the top of the mounting ring 26, and d2 and d3 are fed back by the distance measuring units 25 located at the left and right sides of the mounting ring 26 respectively);

[0050] Define the angle between the detection center axis of the dental film machine 2 and the plane where the cross reference line is located as a, the angle between the plane where the detection end of the dental film machine 2 is located and the plane where the cross reference line is located as b, and the angle between the plane where the detection end of the dental film machine 2 is located and the horizontal plane as c.

[0051] like Figure 5 The plane where the cross reference line is located is in a vertical state, and the tilt state of the dental film machine 2 is adjusted in the distance values ​​fed back by the three distance measuring units. A simulation schematic diagram is made when d2=d3 as an example. The specific calculation process of how to calculate the angle value a is as follows:

[0052] Given L (L can be obtained when three distance measuring units 25 are installed), △x is calculated according to △x=d2-d1;

[0053] According to the trigonometric formula Cos c = △x / L, the angle value c is calculated by inverse trigonometric function;

[0054] According to b = 90°-c, the angle value b is calculated;

[0055] According to a=90°-b, the angle value a is obtained, that is, the angle between the detection center axis (X-ray) of the dental film machine 2 and the plane where the cross reference line is located.

[0056] Among them, regarding "the state of the dental film machine 2 conforms to the preset radiation projection state" in this embodiment, it can be determined as follows: the control module 3 is configured as: if a cross reference line initialization calibration completion signal is received, it is determined that the current state of the dental film machine 2 conforms to the preset radiation projection state.

[0057] In this embodiment, the process example of initializing the cross reference line calibration is as follows:

[0058] The medical staff holds the dental film machine 2 and moves it to the front of the cross reference line, lifts and aligns the detection end of the dental film machine 2 to the cross reference line (center alignment), and observes the distance values ​​fed back by the three distance measuring units 25 displayed on the display screen 22 while fine-tuning the dental film machine 2. If the distance values ​​fed back by the three distance measuring units 25 are equal, the initialization calibration function button preset on the dental film machine 2 is pressed, and the control module 3 receives the trigger signal returned by the initialization calibration function button, and makes the angle between the detection center axis of the dental film machine 2 and the plane where the cross reference line is located be 0, that is, it is determined that the cross reference line initialization calibration is currently completed. It can be understood that multiple angles are displayed on the display screen 22 at the same time, for example: the angle formed by the detection surface when it is tilted downward and the plane where the cross reference line is located, and the angle formed by one side of the detection surface close to the plane where the cross reference line is located.

[0059] It is understandable that before photographing the patient's teeth, the dental film machine 2 needs to be initialized and calibrated against the cross reference line, and each ranging unit 25 needs to be checked step by step to see whether there is a signal output and whether the measured value is reasonable. After completing the above initialization, it is determined that the current state of the dental film machine 2 meets the preset radiation exposure state, that is, the patient's teeth can be radiated.

[0060] Through the above-mentioned settings, medical staff can more intuitively see the angle between the detection center axis of the dental film machine 2 and the plane where the cross reference line is located, that is, the angle between the detection center axis of the dental film machine 2 and the patient's tooth position, so that they can quickly adjust to achieve a more accurate projection angle, and then obtain better quality dental films, thereby improving the use effect of the handheld dental film machine 2.

[0061] In another embodiment of the present application, considering that different patients have different heights and head sizes, the following settings are made: the background board is an electronic screen 1, and the electronic screen 1 is electrically connected to a control module 3, and the control module 3 is configured as follows:

[0062] If a background adjustment instruction is received, the position and size of the head outline and the position of the cross reference line are adjusted, and the electronic screen 1 is made to display.

[0063] Through the above-mentioned arrangement, a main circuit board having multiple physical function buttons installed and electrically connected to the electronic screen 1 can be embedded on the side of the electronic screen 1, for example: up / down / left / right / zoom out / zoom in buttons. Medical staff can adjust the position and size of the head outline displayed on the electronic screen 1 and the position of the cross reference line by pressing each physical function button to adapt to different patients.

[0064] In order to enable the electronic screen 1 to automatically adjust according to the patient's height and head contour size, the following settings are made:

[0065] A second camera 4 is installed above the electronic screen 1, and the lens of the second camera 4 faces the patient. The electronic screen 1 is electrically connected to the second camera 4, and the second camera 4 is electrically connected to the control module 3. The control module 3 is configured as follows:

[0066] Obtain image information fed back by camera 2 4, and perform human body recognition processing based on the image information to obtain the patient's height and head size information;

[0067] Based on the patient's height and head size information, the position and size of the head contour line and the position of the cross reference line that are adapted to the current patient are determined, and the electronic screen 1 is displayed.

[0068] Through the above settings, before photographing the patient's teeth, the patient is first required to stand and face the lens of camera 2 4 for photography. Then, the image information collected by camera 2 4 is used for human body recognition and processing to obtain the patient's height, head position and size, and the position, size of the head contour line displayed on the electronic screen 1 and the position of the cross reference line are adaptively adjusted.

[0069] Reference Figure 2 In another embodiment of the present application, in order to make the entire dental film shooting process smoother, the body 21 is integrated with an interaction unit 5, and the interaction unit 5 includes an audio pickup and playback unit.

[0070] In this embodiment, the audio pickup and playback unit is built into the body 21 and the body 21 has holes for sound to enter and exit. The audio pickup and playback unit can be a miniature pickup unit and a miniature speaker.

[0071] The interaction unit 5 is electrically connected to the control module 3, and the control module 3 is configured as follows:

[0072] If the demand information received from the interaction unit 5 meets the predefined shooting process guidance conditions, a matching guidance prompt is output based on the pre-stored digital dental film projection angle rule, wherein the guidance prompt includes guidance voice and / or text.

[0073] It is understandable that the shooting process guidance condition can be "shooting start" input by the medical staff through voice, and then the digital dental film projection angle rules (the dental film machine 2X detection line inclination angles corresponding to various tooth positions) pre-stored in the database are broadcasted in sequence through the playback unit: the dental film machine 2X line radiation projection inclination angles that should be adjusted corresponding to different tooth positions, or the display screen 22 can also be displayed. Therefore, through the above settings, the medical staff can more intuitively see the dental film machine 2X line radiation projection inclination angles that need to be adjusted according to different tooth positions according to the guidance prompts, so as to adjust the dental film machine 2X line radiation projection angles for different tooth positions more quickly, thereby improving the detection efficiency.

[0074] In another embodiment of the present application, since the patient needs to cooperate in raising and lowering his head during the process of photographing different tooth positions of the patient, in order to make the angle between the central axis and the patient's tooth position detected by the dental radiograph machine 2 more accurate, it is necessary to adjust the background board image displayed on the electronic screen 1 synchronously with the patient's head when the patient lowers or raises his head, and the specific control module 3 is configured as follows:

[0075] If the signal fed back by the distance measuring unit 25 indicates that the cross reference line initialization calibration has been completed, a virtual background image is generated and displayed on the electronic screen 1, wherein the virtual background image includes the cross reference line and the head outline;

[0076] Obtain the movement state and swing angle of the patient's head, and control the virtual background image to follow and adjust.

[0077] Through the above settings, after the initial initialization calibration of the ranging unit 25 and the cross reference line is completed, a virtual background picture is generated. This virtual background picture contains a cross reference line and a head contour line. The plane where the virtual background picture is located is adjusted according to the movement state and swing angle of the patient's head. For example: if the patient lowers his head 20 degrees, the virtual background picture will be tilted 20 degrees diagonally downward; if the patient raises his head 20 degrees, the virtual background picture will be tilted 20 degrees diagonally upward.

[0078] Specifically, how to obtain the movement state and swing angle of the patient's head can be done in the following ways:

[0079] Reference Figure 2 The system further includes a headband and a posture sensing unit 6. The headband is used to be worn on the patient's head. The posture sensing unit 6 includes an IMU. The IMU is built into the outer side of the headband and follows the movement of the patient's head wearing the headband and connects the detection signal to the control module 3 through wireless data. The control module 3 is configured as follows:

[0080] Acquire the perception signal fed back by the posture perception unit 6;

[0081] Based on the sensing signals, the movement state and swing angle of the patient's head are determined.

[0082] Through the above settings, the posture sensing unit 6 collects the acceleration and angular velocity data of the patient's head in real time, and then analyzes the patient's movement state, that is, whether the patient raises his head or lowers his head, and the corresponding movement angle.

[0083] The embodiment of the present application also discloses a digital medical X-ray photography control method.

[0084] The digital medical X-ray photography control method uses any of the digital medical X-ray photography control systems described above to photograph the patient's teeth.

[0085] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A digital medical X-ray photography control system, including a dental film machine, characterized in that: It also includes a background board and a control module; The background plate is used to be placed behind the patient in a vertical posture, and a cross reference line and a head outline are provided on a side of the background plate facing the patient, and the cross reference line and the head outline have the same center point; The dental film machine (2) comprises a body (21), a display screen (22), a camera 1 (23), a balancing component (24) and a distance measuring unit (25); the display screen (22) and the camera 1 (23) are mounted on the body (21), and the lens of the camera 1 (23) faces the front of the detection end of the body (21); the detection end of the distance measuring unit (25) faces the background plate and is used to detect the distance between the detection end of the dental film machine (2) and the background plate; three distance measuring units (25) are provided and integrated in the balancing component (24); the balancing component (24) is used to keep the detection end of the distance measuring unit (25) horizontal; and the balancing component (24) is mounted on the end of the detection end of the body (21); The control module (3) is electrically connected to the display screen (22), the camera 1 (23) and the distance measuring unit (25); The control module (3) is configured as follows: If the current state of the dental film machine (2) meets the preset radiation projection state, the distance detection values ​​fed back by the three distance measuring units (25) are obtained; The angle between the detection center axis of the dental film machine (2) and the plane where the cross reference line is located is calculated based on the distance detection value, and the display screen (22) is displayed.

2. The digital medical X-ray photography control system according to claim 1, characterized in that: The background board is an electronic screen (1), and the electronic screen (1) is data-connected to a control module (3). The control module (3) is configured to adjust the position and size of the head outline and the position of the cross reference line upon receiving a background adjustment instruction, and to enable the electronic screen (1) to display.

3. The digital medical X-ray photography control system according to claim 2, characterized in that: The electronic screen (1) is electrically connected to a second camera (4), the second camera (4) is located above the electronic screen (1) and its lens is arranged toward the patient, the second camera (4) is electrically connected to a control module (3), and the control module (3) is configured as follows: Obtain image information fed back by camera 2 (4), and perform human body recognition processing based on the image information to obtain the patient's height and head size information; Based on the patient's height and head size information, the position and size of the head contour line and the position of the cross reference line adapted to the current patient are determined, and the electronic screen (1) is displayed.

4. The digital medical X-ray photography control system according to claim 1, characterized in that: The body (21) is integrated with an interaction unit (5), the interaction unit (5) is electrically connected to the control module (3), the interaction unit (5) comprises an audio pickup and playback unit, and the control module (3) is configured as follows: If the demand information received as feedback from the interaction unit (5) meets the predefined shooting process guidance conditions, a matching guidance prompt is output based on the pre-stored digital dental film projection angle rule, and the guidance prompt includes guidance voice and / or text.

5. The digital medical X-ray photography control system according to claim 1, characterized in that: The detection end of the body (21) is detachably sleeved with an assembly ring (26), the outer diameter of the assembly ring (26) being larger than the head contour of the patient, the balancing assembly (24) being mounted on the assembly ring (26), and the control module (3) being configured to determine that the current state of the dental radiograph (2) complies with a preset radiation projection state upon receiving a cross reference line initialization calibration completion signal.

6. The digital medical X-ray photography control system according to claim 5, characterized in that: The control module (3) is configured as follows: If a cross reference line initialization calibration completion signal is received, a virtual background image is generated and displayed on the electronic screen (1), wherein the virtual background image includes a cross reference line and a head outline; Obtain the movement state and swing angle of the patient's head, and control the virtual background image to follow and adjust.

7. The digital medical X-ray photography control system according to claim 6, characterized in that: It also includes a headband and a posture sensing unit (6), wherein the headband is used to be worn on the patient's head, the posture sensing unit (6) is built into the headband, the control module (3) is electrically connected to the posture sensing unit (6), and the control module (3) is configured as follows: Acquiring a perception signal fed back by a posture perception unit (6); Based on the sensing signals, the movement state and swing angle of the patient's head are determined.

8. The digital medical X-ray photography control system according to claim 5, characterized in that: The balancing assembly (24) comprises a fixing frame (241), a first support (242), a second support (243) and a balancing ball (244); The fixing frame (241) has a U-shaped cross section and is fixedly connected to the outside of the assembly ring (26); the support 1 (242) is fixed to the inner wall of the upper end of the fixing frame (241); the support 2 (243) is fixed to the inner wall of the lower end of the fixing frame (241); the balancing ball (244) is located between the support 1 (242) and the support 2 (243); the support 1 (242) and the support 2 (243) are coaxial and the axis extends along the central axis of the balancing ball (244); the ends of the support 1 (242) and the support 2 (243) facing the balancing ball (244) are both provided with arc surfaces that fit the upper and lower spherical surfaces of the balancing ball (244); the arc surfaces and the spherical surface of the balancing ball (244) are both provided with smooth surfaces; The balancing ball (244) is provided with a groove (245) along its radial direction for embedding and installing the distance measuring unit (25), and the distance measuring unit (25) is embedded at the center of the balancing ball (244).

9. A digital medical X-ray photography control method, characterized in that: The digital medical X-ray photography control system as described in any one of claims 1 to 8 is used to photograph the patient's teeth.

Images