WO2009021447A1

WO2009021447A1 - A method and an equipment of human body's center of gravity in x light image formation real-time demarcation.

Info

Publication number: WO2009021447A1
Application number: PCT/CN2008/071937
Authority: WO
Inventors: Chunhui Wu; Amir A. Mehbod; Ensor E. Transfeldt
Original assignee: Chunhui Wu; Mehbod Amir A; Transfeldt Ensor E
Priority date: 2007-08-10
Filing date: 2008-08-08
Publication date: 2009-02-19

Abstract

A method and an equipment of human body's center of gravity in X light image formation real-time demarcation. Firstly, the method is real-timely to measure the information from a measuring plate; then ,after a enlarge process, a digital-analog conversion and an error correction step, a data is transmitted to a cursor movement controller, by which can control the cursor real-timely to follow the movement of a human body's center of gravity; at last, a X light photography is got for the human body's spinal column balanced observation. The equipment includes a measuring plate, a negative chamber and a cursor positioning device.

Description

Real-time calibration method and device for human body weight in X-ray imaging

Technical field

The invention relates to a real-time calibration method and device for human body weight in X-ray imaging.

Background technique

The center of gravity of the human body refers to the vertical line passing through the center of gravity of the human body. In spine surgery, the center of gravity of the human body is traditionally determined by the seventh section of the cervical vertebra of the patient. On the X-ray image, the position of the center of gravity relative to the spine It is useful for the treatment and diagnosis of patients. However, some recent studies have found that the use of the seventh segment of the cervical vertebra as the center of gravity is inaccurate, especially for patients with scoliosis, and suggests that the position of the gravity line can be measured by the principle of reaction when the patient is standing stably. The board is measured. There are already methods for calibrating the position of the patient's center of gravity. Although these methods use different force plates and image processing methods, their measurement steps are basically the same, using one and the same. The computer records the signal of the measuring board in real time and calculates the position of the center of gravity line. After the X-ray film is exposed, it is scanned and input into the computer, and then the computer processes the image and marks the position of the center of gravity of the X-ray film exposure moment into the image. The structure of the force plate can be as described in US Pat. No. 6,354, 155, US Pat. No. 5,595, 705, US Pat. However, this method requires many steps and specialized operators. The structure of the device is also complicated, and the clinical use is inconvenient. DISCLOSURE OF THE INVENTION The present invention mainly provides a method and a device which are simple in structure, convenient in operation, and capable of fully automatic measurement and marking of a center of gravity line, which greatly simplifies clinical application; and solves the complicated equipment existing in the prior art. The operation is unchanged, and technical problems that are inconvenient to apply in clinical practice. The invention also provides an instant calibration of the center of gravity, the person can accurately measure the position of the center of gravity within a certain range of motion, and can clearly see the relative position of the spine and the center of gravity line from two directions, which is convenient for the doctor to focus on the diagnosis. The method and device for real-time calibration; solving the technical problem that the center of gravity cannot be active in the prior art.

The above technical problem of the present invention is mainly solved by the following technical solutions: a real-time calibration method for human body weight in X-ray imaging, the first step, let the human body stand on the force plate; the second step, located at The sensor unit inside the force measuring board transmits the movement information collection and analysis of the center of gravity of the human body on the force measuring board to the signal processing system. In the third step, the signal processing system sends the processed command to the cursor motion controller located above the force measuring board. Inside, the cursor motion controller controls the actuator to drive the cursor to follow the movement with the movement of the center of gravity of the human body; the fourth step, after the human body stands, the signal processing system calculates the gravity information on the gravity plate to determine the position of the center of gravity, and transmits the information to The motion controller, the cursor motion controller controls the moving speed of the cursor to follow the movement of the person's center of gravity at a very low moving speed, and finally locates;

The X-ray source is turned on immediately, and the position of the person's center of gravity is imaged on the X-ray film by cursor imaging. After the person stands on the force plate, the sensor unit at the bottom of the force plate transmits the information obtained on the force plate to the signal processing system, the signal processing system processes it in real time, and transmits the result to the cursor motion controller. Therefore, the control cursor moves in real time following the movement of the center of gravity of the human body, and the information processing system also processes the information uploaded by the force plate in real time, thereby controlling the cursor movement controller, and the cursor is moved by the controller so that the cursor is always following the human body. The center of gravity moves and moves. When the human body stands, the cursor controller controls the cursor to move at a very slow speed to determine the position of the center of gravity of the human body. At this time, the cursor shakes only a few millimeters, which does not affect the exposure and imaging of the X-ray. Imaging on an X-ray film cassette. The above method controls the cursor to move in real time following the movement of the center of gravity of the human body, and immediately images after determining the center of gravity, and performs fully automatic force measurement and marking on the center of gravity line, and has simple operation, automatic instant imaging and imaging. The position is accurate and the imaging effect is good.

A device for real-time calibration of a human body weight in X-ray imaging, comprising a force measuring plate, an X-ray source is disposed outside the force-measuring plate, and a sensor unit is mounted inside the force-measuring plate, The sensor unit is connected to the signal processing system, and has an X-ray film cassette on a side perpendicular to the force plate, and a cursor positioning device is disposed on an upper side of the X-ray film cassette, the cursor positioning device The movable cursor, the cursor actuator and the cursor motion controller are included, and the cursor motion controller is coupled to the signal processing system. The sensor unit in the force plate transmits the obtained information on the force plate to the signal processing system in real time. The motion controller of the cursor is controlled by the processing of the signal processing system, and the motion controller of the cursor controls the cursor movement through the actuator. After the cursor is positioned, the X-ray source on the outside of the force plate is opened and imaged on the X-ray film cassette. Thanks to the marking of the cursor, the position of the center of gravity of the human body at this time can be clearly recorded on the negative film, and the result can be conveniently recorded.

As a preferred method of the above method, the movement of the cursor and the real-time shooting of the X-ray can be monitored in real time by a monitor disposed outside the force plate. The monitor monitors the cursor and the shooting process. If a problem occurs, it can be known and adjusted as soon as possible, and the monitor can more intuitively observe the operation of the device. The monitor can be a computer, a PC, an LCD display, and the like.

As a preferred method of the above method, X-ray imaging is first subjected to an error compensation calculation program and then imaged on an X-ray film. X-ray is a point source, and there is an amplification effect after imaging the human bone. Therefore, the position of the cursor must be compensated for errors. By compensating the structure, the results of the measurement can be more accurately imaged on the X-ray film.

Preferably, as described above, the signal processing system passes the transmitted voltage value of the sensor unit located in the gravity plate to determine the coordinate position of the human body on the gravity plate. Assume that the four sensor units are distributed on a square of 2d by 2d, so that the position of the center of gravity line can be calculated by the following formula F _X -F ₂ -F, +F ^

x =― -a

F _{l +} F ₂ +F ₃ +F ₄

F _{1 +} F ₂ -F ₃ -F ₄ ^

y =― ^≤ -α ,

The origin of the F, + F ₂ + F ₃ + F ₄ coordinates is at the center of the square. The measured force of each sensor can be used

Calculation. Vi is the voltage signal output of the i-th sensor, and the sensitivity of the i-th sensor is expressed in mV/V FS. The excitation voltage is typically 5-10V. The full scale (FS) of all sensor elements is the same. The sensor unit for weighing the human body is usually 50kg in full scale. The coordinates of the center of gravity line can also be expressed as

X_v s, -V s ₂ -v ₃ / s ₃ + vs _{4 d}

In order to simplify the calibration process of the force plate, the sensitivity of the sensor unit is preferably paired (four sensor units have the same sensitivity), and the sensitivity error of the pairing can be controlled below 0.1-0.05%. In this case, the coordinate expression of the center of gravity line can be simplified to

_Vi -v ₂ -v ₃ + v ₄

X = " -a

ν _{ι +} ν _{ι +} ν^ + ν ₄ Therefore, the position of the center of gravity can be calculated directly from the measured voltage value without the need to calibrate the sensitivity of a single sensor unit.

As a preferred method, when the tracking error of the cursor is in the range of about 1 mm or when the human body is stable, the signal processing system transmits the information to the signal indicator, and the control signal indicator changes, so that the operator can instantly turn on the X-light source switch. . When the human body stands firm and the center of gravity is determined, the flashing or changing of the signal light allows the user to operate the device for X-ray imaging in time. In the need to take pictures of the front and side of the human body, you can rotate the body 90 degrees on the force plate, and then position the shot. Preferably, the X-ray film is respectively fixed on two mutually perpendicular negative plates, and a cursor controller, an actuator and a cursor are respectively arranged on the two negative plates, and two cursor controllers are provided. The signal processing system is connected and imaged separately on two negative films that are perpendicular to each other. Imaging in both directions, imaging the coronal and sagittal planes of the spine separately, making doctors more convenient and more accurate. The two cursor control systems can operate independently and without affecting each other, both of which operate according to the instructions of the signal processing system, making the readiness of the operation better.

The signal processing system can be located in the measuring panel as the sensor unit or at any location outside the force plate. Preferably, as described above, the signal processing system is located in the force plate, and the cursor motion controller and the real-time information monitor are connected by wires, and the real-time information monitor is located outside the force plate. Located in the force plate, it can facilitate the connection between the sensor unit and the signal processing system, while saving space and reasonable layout, making the transmission data more accurate.

As a preferred embodiment of the above apparatus, the force measuring plate has a quadrangular shape, and the force measuring plate is composed of an upper layer bearing plate and a lower layer supporting plate, and is provided at four corners between the two layers. Four sensor units, four sensor units are connected to the signal processing system. The sensor unit is provided at the four corners of the force plate, and the signals of the four corners are sampled and analyzed by the amplification and analog-to-digital conversion circuit, and then transmitted to the cursor controller. The four corners are evenly arranged with sensor units to make the collected signals more accurate, while the structure is simpler and the stability is good. At the same time, the data in the X and Y directions can be output, and the two film cassettes and the X light source are simultaneously imaged, the operation is simple, the imaging efficiency is high, and the error correction is also better.

As another preferred embodiment of the above apparatus, the gravity plate has a quadrangular shape, and the gravity plate is composed of an upper layer bearing plate and a lower layer supporting plate, and two parallel sides are fixed on the lower layer supporting plate. a conductive strip, wherein each of the conductive strips is fixed with a sensing strip, two of the sensing strips Each of the terminals is fixed with a sensor unit, and the two conductive strips are respectively connected to the signal processing system. The conductive strips are used to summarize the signals collected by the sensor units located thereon and then transmitted to the signal processing system. The imaging reference is determined by the coordinates of one direction of the output, which can reduce the workload of the letter processing system and improve efficiency.

Preferably, as the above device, the cursor positioning device is located at the upper middle portion of the X-ray film cassette, and its height is 2/3-6/7 of the height of the film cassette, and the inside of the film cassette is arranged A wire-like wire. The position of the cursor is located at the upper middle of the film case, and is located at the left and right of the neck of the human body, so that the effect of X-ray shooting can be clearly observed with the cursor position as a reference to observe the balance state of the human body. After the wire is placed inside the film cassette, a meshed grid appears on the imaged film, which makes it easier for the doctor to observe the position of the tester's spine.

Preferably, the cursor actuator comprises a stepping motor, the stepping motor drives the driving wheel to rotate, and the driving wheel drives the driven wheel to rotate through the toothed belt, wherein the driving wheel and the driven wheel are fixed at the X The top end of the light box or the two sides of the front side, the cursor is fixed on the toothed belt, and the stepping motor is connected to the cursor motion controller. The motion of the stepping motor is controlled by the cursor controller to control the moving speed and position of the cursor, and the cursor controller is connected to the signal processing system, thus completing the real-time movement of the cursor following the movement of the center of gravity of the human body.

Preferably, as the device, the cursor is adhered to the toothed belt, the cursor is a lead cone or a triangular shape, or other easily recognizable geometric shape, the tip of the cursor Point vertically to the force plate. The cursor is made of an opaque lead material, and the position of the cursor can be clearly marked on the film to facilitate the determination of the position of the center of gravity.

Preferably, as the above device, the film cassette has two, the two film cassettes are perpendicular to each other, and the cursor positioning device is arranged on the upper part or the front side of the two film cassettes, and the cursor movement control in the two cursor positioning devices The controllers are all connected to the signal processing system. The two film cassettes are perpendicular to each other and can image the front and side of the human spine separately for a clearer view.

Preferably, as the above device, a stroke switch is provided on the side of the driving wheel. The travel switch is used to control the cursor travel and zero the cursor position to ensure the accuracy of each measurement.

Preferably, as described above, the signal processing system includes a signal amplifying unit, an analog to digital converting unit and an error compensating unit. The signal transmitted by the sensor is generally a weak voltage signal. After the amplification and analog-to-digital conversion, the position of the center of gravity can be calculated, and then the error compensation is performed, and the corrected result is transmitted to the cursor control device.

Therefore, the method and apparatus for real-time calibration of a person's body weight in X-ray imaging have the following advantages: 1. The signal is transmitted to the signal processing system through a fixed sensor unit on the force plate, and the signal processing unit controls the measurement. The cursor above the force plate follows the center of gravity of the human body. After the position of the center of gravity is determined, the X-ray is used for real-time imaging. The degree of automation is high, the operation is simple, and the imaging accuracy is good. 2. The top of the force plate is perpendicular to each other. Two X-ray film cassettes can image the two directions of the human spine, and the imaging effect is good, which is convenient for doctors' consultation; 3. The data is compensated, so that the position of the last cursor is more accurate and the positioning effect is better; 4. Using the opaque and easily recognizable lead-shaped triangle as the cursor, and positioning the cursor at the upper middle of the film cassette, the position of the cursor can be clearly seen on the film to determine the position of the center of gravity line. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of an apparatus for real-time calibration of a human body's center of gravity during X-ray imaging. Figure 2a is a schematic illustration of a coronal plane imaged from the front. Figure 2b is a schematic view of the sagittal plane imaged from the side.

Figure 3 is an exploded perspective view of the force plate of Figure 1.

Figure 4 is another exploded view of the force plate of Figure 1.

Figure 5 is a schematic diagram of compensation for X-rays.

Figure 6 is a plan view of the cursor control device of Figure 1.

Figure 7 is a schematic illustration of another apparatus for immediate calibration of the center of gravity of the present invention. Best way to implement the invention

The technical solutions of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. Example:

A real-time calibration method for human body weight in X-ray imaging, allowing the human body to stand in the middle position of the force measuring plate; at this time, the sensor unit inside the force measuring plate collects and transmits the movement information of the center of gravity of the human body on the force measuring plate. Signal processing system; The signal processing system processes the signal in real time. The signal processing system calculates the position of the center of gravity line after amplification and analog-to-digital conversion, and then performs error compensation to send the corrected data to the cursor motion control located above the force plate. In the device, the cursor motion controller controls the actuator to drive the cursor to follow the movement as the center of gravity of the human body moves; at the same time, the information transmission and the movement of the cursor can be seen in the monitor outside the force plate. When the human body stands, the cursor controller controls the cursor to move at a very slow speed to determine the position of the center of gravity of the human body. At this time, the cursor shakes only a few millimeters, which does not affect the exposure and imaging of the X-ray. Imaging on an X-ray film cassette.

As shown in FIG. 1, a device for real-time calibration of a person's body weight in X-ray imaging includes a force plate 30 in which a sensor unit and an information processing system 60 are disposed. Above the force plate and the force plate Vertically provided with an X-ray film cassette 20, the film cassette can be moved up and down, an X-ray film 21 is arranged in the X-ray film box, and a cursor positioning device is fixed above the X-ray film box, and the cursor positioning device includes cursor movement Controller 50. The signal is transmitted to the information processing system 60 through the sensor unit, but the signal transmitted by the sensor unit is a weak voltage signal, which needs to be amplified and digital-to-analog converted in the signal processing system 60, and the signal processing system 60 calculates the position of the center of gravity line before performing the error. Compensating, and then transmitting the corrected center of gravity line position to the cursor motion controller 50. The cursor motion controller is connected to the information processing system 60 via the wire 22, and the cursor motion controller controls the cursor actuator 40 to move the cursor 41. The cursor 41 is leaded. A triangular body made of a material. A monitor 23 is provided on the outside of the force plate and the film cassette, and the monitor 23 is a computer. Above the force plate 30, an X-ray source 24 is provided at a position opposite to the film cassette 20. As shown in Figures 2a and 2b, an example of imaging the human spine on the backsheet is shown. The spine 100 and the pelvis of the human body can be clearly seen on the backsheet. The cursor is imaged on the film as a two-dimensional mark 101, and the line that is vertically downward from the mark 10 is the line of gravity 102. A structure of the force plate is shown in FIG. 3 and is square. The force plate includes a pressure plate 305 of the upper layer and a support plate 300 of the lower layer. Sensor units 301, 302, 303, and 304 are respectively fixed at four corners of the lower support plate 300, and the contact point of each sensor unit should be as small as possible, so that the gravity of the human body can be transmitted to the sensor through a fixed point. An information processing system 60 is fixed between one of the two sensor units 303 and the sensor unit 302 on one side of the lower support plate. Assume that the four sensor units are distributed on a square of 2d by 2d, so that the position of the center of gravity line can be calculated by the following formula

F _X - F ₂ - F, + F ^

X =― - a

F _x + F ₂ + F ₃ + F ₄

The origin of the coordinates is at the center of the square. The measured force of each sensor can be used

Calculation. Vi is the voltage signal output of the i-th sensor, and the sensitivity of the i-th sensor is expressed in mV/V FS. The excitation voltage is typically 5-10V. The full scale (FS) of all sensor units is the same. The sensor unit for weighing the human body is usually 50kg in full scale. The coordinates of the center of gravity line can also be expressed as

X_ _Vi / _Sl -v ₂ /s ₂ -v ₃ /s ₃ + v ₄ /s _{4 d}

VS _x +V ₂ / S ₂ +V ₃ / S ₃ + VS ₄ ' In order to simplify the calibration process of the force plate, the sensitivity of the sensor unit is best matched (four sensor units have the same sensitivity), the sensitivity error of the pairing Can be controlled below 0.1-0.05%. In this case, the coordinate expression of the center of gravity line can be simplified to

X = " -a

Since the X-ray is a point source, there is an amplification effect after the human bone is imaged. Therefore, the position of the marker block must be compensated by error. The compensation principle is shown in Fig. 5. Let 25 be the plane where the X-ray film is located, 26 is the plane where the cursor 41 is located. If at some point, the center of gravity of the human body is at 28, the coordinate value is (x, y using the projection principle of light, the marker block 41 should be moved to Position 27, the compensation value dx can be obtained by a triangular relationship:

x + dx = (a- y)xl c. The force plate outputs data in both directions of the X and Y axes, using the two cassettes and two Xs in Figure 7. The light source can simultaneously shoot the coronal plane and the sagittal plane at the same time, and the imaging efficiency is high, and the error correction is also better. It is of course also possible to use the device shown in Fig. 1 to image twice by rotation using the output in one direction.

Another structure of the force plate is shown in Fig. 4. The force plate includes a pressure plate 305 of the upper layer and a support plate 300 of the lower layer. On the opposite sides of the lower support plate 300, conductive strips ₃₄₀ and conductive strips 341 which are parallel to each other are fixed, and below the conductive strips 340, an information processing system 60 is fixed inside the support plate 300. A sensing strip 342 is connected above the conductive strip 340, and sensor units 353 and 352 are disposed at both ends of the sensing strip 342. Correspondingly, a sensing strip 343 is connected above the conductive strip 341 at both ends of the sensing strip 343. Two sensor units 351 and 354 are fixed. The sensor units 351, 352, 353, 354 correspond to the four corners of the force plate, respectively. The force-measuring plate of this structure outputs signals in one direction, the signal processing amount is small, and the efficiency of the signal processing system is high.

As shown in FIG. 6 , the cursor positioning device includes a stepping motor 401. The driving wheel 402 is sleeved on the output shaft of the stepping motor 401. The driving wheel 402 drives the driven wheel 405 through the toothed belt 403 on the toothed belt 403. The cursor 41 is secured to the toothed belt by a fixed strip 406 that is permeable to X-rays. The cursor 41 is a X-ray impervious triangle made of lead or other materials. The middle position of the cursor should be aligned with the center line of the film or the film cassette, and the center line of the film or the film cassette also needs to be aligned with the center line of the force plate. In this way, when the X-ray is taken, the correct mark can be left on the film to mark the gravity line. A stroke switch 404 is provided on the side close to the motor, and the position of the marker block can be zeroed before each use to ensure the accuracy of each measurement.

As shown in FIG. 7, it is another structure of the human body weight calibration device. In this configuration, the negative film cassette 20 and the film cassette 201 are disposed above the force measuring plate 30, respectively, in the two negative cassettes. The negative film 21 and 211, two negative films and one corresponding one X light source are disposed, and the negative film cassette 20 corresponds to the X light source 24, The film cassette 211 corresponds to the X light source 241. A cursor positioning device is disposed in the upper middle portion of the two film cassettes, and the cursor positioning device above the film and 211 includes a cursor motion controller 501, an actuator 401 and a cursor 411. The film cassette 20 and the film cassette 201 are movable up and down by a lifting mechanism. Both cursor motion controllers 50 and 501 are connected to the information processing system 60 within the force plate 30 by wires, and are also connected to a monitor 23, which is well known in the art.

The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

12

Claims

Rights request

1. A real-time calibration method for a person's body weight in X-ray imaging, characterized in that: the first step is to let the human body stand on the force measuring plate; the second step is that the sensor unit located inside the force measuring plate measures the human body The mobile information collection and analysis of the center of gravity on the force plate is transmitted to the signal processing system. In the third step, the signal processing system sends the processed command to the cursor motion controller located above the force plate, and the cursor motion controller controls the actuator to drive the cursor. The fourth step, when the human body stands, the signal processing system calculates the gravity information on the gravity plate to determine the position of the center of gravity, and transmits the information to the motion controller, and the cursor motion controller controls the cursor. The speed of movement is such that it follows the weight of the person to move at a very low moving speed, and finally the positioning; in the fifth step, the X-ray source is immediately turned on, and the position of the human body center of gravity is imaged on the X-ray film in real time.

2 . The real-time calibration method for human body weight in X-ray imaging according to claim 1 , wherein: the movement of the cursor and the real-time shooting of the X-ray can be performed in real time through a monitor disposed outside the force plate. monitor.

3. The real-time calibration method for human body weight in X-ray imaging according to claim 1 or 2, wherein: X-ray imaging is preceded by an error compensation calculation program, and then imaged on an X-ray film or a digital image. On the X-ray imaging device.

4 . The real-time calibration method for human body weight in X-ray imaging according to claim 1 or 2, wherein: the signal processing system transmits the voltage value transmitted by the sensor unit located in the gravity plate. To determine the coordinate position of the human body on the gravity plate.

The real-time calibration method for human body weight in X-ray imaging according to claim 1 or 2, wherein: when the tracking error of the cursor is within a range of about 1 mm or when the human body is stable, signal processing The system transmits the information to the signal indicator, and the control signal indicator changes, thereby the operator The X light source switch can be turned on instantly.

6 . The real-time calibration method for human body weight in X-ray imaging according to claim 1 or 2, wherein: the X-ray film is respectively fixed on two mutually perpendicular negative plates, The two negative plates are respectively provided with a cursor controller, an actuator and a cursor. The two cursor controllers are connected to the signal processing system and respectively imaged on the two negative films which are perpendicular to each other.

7. A device for real-time calibration of a person's body weight in X-ray imaging, comprising a force plate, characterized in that: an X-ray source is disposed outside the force-measuring plate, and is installed inside the force-measuring plate a sensor unit, wherein the sensor unit is connected to a signal processing system, an X-ray film cassette is disposed on a side perpendicular to the force plate, and a cursor positioning device is disposed on an upper side of the X-ray film cassette. The cursor positioning device comprises an active cursor, a cursor actuator and a cursor motion controller, and the cursor motion controller is connected to the signal processing system.

8. The apparatus for real-time calibration of a human body center of gravity in X-ray imaging according to claim 7, wherein: said signal processing system is located in a force measuring plate, and said cursor motion controller is connected by a wire; A real-time information monitor, the real-time information monitor is located outside the force plate.

9. The device for real-time calibration of a human body weight in X-ray imaging according to claim 7 or 8, wherein: the force-measuring plate has a quadrangular shape, and the force-measuring plate is a pressure plate of an upper layer. And the lower support plate, four sensor units are arranged at four corners between the two layers, and the four sensor units are respectively connected to the signal processing system.

10. The device for real-time calibration of a human body weight in X-ray imaging according to claim 7 or 8, wherein: the force-measuring plate has a quadrangular shape, and the force-measuring plate is a pressure plate of an upper layer. And a lower support plate, wherein two conductive strips parallel to each other are fixed on the lower support plate, and a sensing strip is fixed on each of the conductive strips at each end of the sensing strip Fixed with a sensor The two conductive strips are respectively connected to the signal processing system.

11. The apparatus for real-time calibration of a human body center of gravity in X-ray imaging according to claim 7 or 8, wherein: said cursor positioning means is located at an upper middle portion of the X-ray film cassette, the height of which is said negative film At a height of 2/3-6/7 of the height of the box, a wire-like steel wire is arranged inside the film cassette.

12. The device for real-time calibration of a human body weight in X-ray imaging according to claim , or 8, wherein: the cursor actuator comprises a stepping motor, and the stepping motor drives the driving wheel to rotate, The driving wheel drives the driven wheel to rotate through the toothed belt, the driving wheel and the driven wheel are fixed on both sides of the top end of the X-ray film box, the cursor is fixed on the toothed belt, and the stepping motor is connected to the cursor Motion Controller.

13. The apparatus for real-time calibration of a human body center of gravity in X-ray imaging according to claim 12, wherein: said cursor is adhered to said toothed belt, said cursor being a lead cone The shape of the body or the triangle, the tip of the cursor is vertically downward.

14. The apparatus for real-time calibration of a human body center of gravity in X-ray imaging according to claim 7 or 8, wherein: said film cassette has two, and two film cassettes are perpendicular to each other, in the upper part of the two film cassettes. There are cursor positioning devices, and the cursor motion controllers in the two cursor positioning devices are connected to the signal processing system.

The device for real-time calibration of a human body weight in X-ray imaging according to claim 7 or 8, wherein a stroke switch is provided on the side of the driving wheel.

16. The apparatus for real-time calibration of a human body weight in X-ray imaging according to claim 7 or 8, wherein: said signal processing system comprises a signal amplifying unit, an analog to digital converting unit and an error compensating unit.