X-ray source for medical bone age machine and bone mineral density instrument

Abstract

The utility model relates to the technical field of X-ray sources, and discloses an X-ray source for a medical bone age machine and a bone mineral density instrument, which comprises a main control assembly and a machine head assembly which are connected with each other through a cable, the machine head assembly comprises an X-ray tube, an anode flow limiting plate, a cathode flow limiting plate, a voltage-multiplying rectifying plate and a sealing interface plate, the two ends of the X-ray tube are connected with the anode flow limiting plate and the cathode flow limiting plate respectively, the anode flow limiting plate is connected with an E7 pin of the voltage-multiplying rectifying plate, the cathode flow limiting plate is connected with an E6 port of the voltage-multiplying rectifying plate, an MJ1 port and an MJ2 port of the voltage-multiplying rectifying plate are connected with the sealing interface plate, and the sealing interface plate is connected with the X-ray tube. The main control board is provided with an interface circuit, a tube current control circuit and a main controller; only a simple interface circuit is needed for control, and the difficulty of system integration is reduced; a framework is adopted in the machine head assembly for insulation, and a transformer and a circuit board are highly integrated, so that the whole machine is small in size, small in occupied space and high in flexibility.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray sources, in particular to an X-ray source for a medical bone age machine and a bone density instrument. Background Art

[0002] Bone age machines are an important way to measure bone age, assess children's bone growth, and understand growth and development status. Bone densitometers are used to measure bone density, help assess bone health, and detect the risk of osteoporosis and other diseases in advance. Bone densitometers can also be used in sports training to understand athletes' bone growth and development. Sometimes bone age machines also have the function of bone densitometers.

[0003] Like other X-ray medical imaging equipment, bone age machines also require an X-ray source to generate X-rays. As the market has increasingly more functional and performance requirements for bone age machines, the matching X-ray source can no longer meet the technical requirements of the product. This is mainly manifested in: using analog control, the exposure parameters are single and cannot be adjusted; the size is relatively large, occupying a relatively large space; the dose accuracy is unstable and is greatly affected by temperature and tube aging. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an X-ray source for a medical bone age machine and a bone densitometer.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An X-ray source for a medical bone age machine and a bone densitometer comprises a main control component and a head component interconnected by cables, wherein the main control component comprises a main control board and a switching power supply, the head component comprises an X-ray tube, an anode current limiting plate, a cathode current limiting plate, a voltage doubler rectifier board and a sealed interface board, two ends of the X-ray tube are respectively connected to the anode current limiting plate and the cathode current limiting plate, the anode current limiting plate is connected to the E7 pin of the voltage doubler rectifier board, the cathode current limiting plate is connected to the E6 port of the voltage doubler rectifier board, the MJ1 and MJ2 ports of the voltage doubler rectifier board are connected to the sealed interface board, and the main control board is provided with an interface circuit, a tube current control circuit and a main controller.

[0007] In the utility model, preferably, the E1, E2, E8 and E9 pins of the voltage doubler rectifier board are connected to the high voltage transformer, the E3-E5 pins are connected to one end of the filament transformer, and the other end of the filament transformer is connected to the E1 and E2 pins of the cathode current limiting board.

[0008] In the utility model, preferably, the head assembly also includes a shell and an insulating frame, the insulating frame is fixedly arranged in the shell, the insulating frame is provided with a high-pressure chamber and a low-pressure chamber, the high-pressure chamber is fixedly provided with a high-voltage transformer, a filament transformer and the voltage doubler rectifier plate, and the low-pressure chamber is fixedly provided with the X-ray tube.

[0009] In the utility model, preferably, a ray port is provided in the housing directly facing the X-ray tube.

[0010] In the utility model, preferably, the sealing interface plate is fixedly arranged on one side surface of the shell.

[0011] In the utility model, preferably, the interface circuit includes an interface controller U4, and pins 9, 10, 11 and 12 of the interface controller U4 are respectively connected in series with a resistor and a diode circuit and then connected to a 3.3V power supply, pins 13 and 14 are connected to the system communication control interface MJ2, and pins 7 and 8 are connected to the debugging and service interface MJ8. The interface controller U4 is also connected in series with diodes CR1, CR2, CR14, CR15 in the connection loop with the system communication control interface MJ2, and the system communication control interface MJ2 is also connected in series with capacitors C20, C21, C58, C61 and then grounded.

[0012] In the present utility model, preferably, the tube current control circuit includes inverters U29C, U30C, U30D, U33A, U33C and U33D, the positive input end of the follower U33A is connected in series with a resistor R140 and then connected to the Fil_Set signal transmitted by the main controller, the negative input end is connected in series with the 14th pin of the analog switch U30D, the input end of the inverter U29C is connected to the Ma_Loop_Ctl signal transmitted by the main controller, the output is connected to the 16th pin of the analog switch U30D, and the Ma_Loop_Ctl signal is input to the 9th pin of the operational amplifier U33C, and the positive input end of the operational amplifier U33C is connected in series with a resistor R150 It is then connected to the Ma_Set signal transmitted by the main controller, the output end of the operational amplifier U33C is connected in series with resistor R151 and then connected to the positive input end of the operational amplifier U33D, the negative input end of the operational amplifier U33D is connected in series with resistor R152 and then connected to the Ma_Fb signal transmitted by the main controller, a resistor R153 and a capacitor C130 are also connected in series between the negative input end and the output end of the operational amplifier, a capacitor C131 is also connected in parallel between the resistor R153 and the capacitor C130, the output end of the operational amplifier U33D is connected to pin 10 of the operational amplifier U30C, and the pin 15 of the analog switch U30D and the pin 11 of the operational amplifier U30C are connected together to output the FilProg signal.

[0013] In the present invention, preferably, the main controller includes a controller U1A and a controller U1B, and the controller U1A is communicatively connected with the tube current control circuit and the interface circuit to perform signal interaction.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The X-ray source of the utility model adopts digital control and only needs a simple interface circuit for control, which reduces the difficulty of system integration; in addition, exposure parameters, including tube voltage, tube current, exposure time, etc. can be set through serial communication, and the state of the ray source can also be fed back to the system end through the serial port for display and use;

[0016] The head assembly is insulated by a skeleton, and the transformer and circuit board are highly integrated, making the whole machine small in size, taking up less space and highly flexible;

[0017] By adopting closed-loop control of tube current, the output dose does not change with external conditions, ensuring that the quality of X-rays meets the system's requirements for clear image reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of electrical connection of an X-ray source for a medical bone age machine and a bone densitometer.

[0019] Figure 2 This is a schematic diagram of the electrical principle of the head assembly described in the utility model.

[0020] Figure 3 It is a schematic diagram of the overall structure of the head assembly described in the utility model.

[0021] Figure 4 It is a cross-sectional view of the head assembly described in the utility model.

[0022] Figure 5 The utility model is a circuit diagram of the interface circuit.

[0023] Figure 6 This is a circuit diagram of the tube current control circuit described in the utility model.

[0024] Figure 7 This is a circuit diagram of the main controller described in the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] Please also see Figure 1 Figure 2 A preferred embodiment of the utility model provides an X-ray source for a medical bone age machine and a bone densitometer. It adopts a digital control method and only requires a simple interface circuit for control. The control system integration is relatively easy. At the same time, the structure adopts two components. An insulating skeleton is used inside the head component to divide the high and low voltage into different areas. While reducing the overall structure, it ensures long-term normal and stable operation. The internal circuit board is highly integrated. The whole machine is smaller in size than a conventional radiation source, occupies less space, and is more flexible.

[0029] The X-ray source specifically includes a main control component and a head component interconnected by cables, wherein the main control component includes a main control board and a switching power supply, and the head component includes an X-ray tube 1, an anode current limiting plate, a cathode current limiting plate, a voltage doubler rectifier plate 2 and a sealed interface board 3, wherein the two ends of the X-ray tube 1 are respectively connected to the anode current limiting plate and the cathode current limiting plate, the anode current limiting plate is connected to the E7 pin of the voltage doubler rectifier plate 2, the cathode current limiting plate is connected to the E6 port of the voltage doubler rectifier plate 2, the MJ1 and MJ2 ports of the voltage doubler rectifier plate 2 are connected to the sealed interface board 3, the main control board is provided with an interface circuit, a tube current control circuit and a main controller, and the main control board is connected to the upper computer system through the interface circuit. The switching power supply provides control power and main power supply for the whole machine.

[0030] The E1, E2, E8 and E9 pins of the voltage doubler rectifier board 2 are connected to the high voltage transformer 4, the E3-E5 pins are connected to one end of the filament transformer 5, and the other end of the filament transformer 5 is connected to the E1 and E2 pins of the cathode current limiting board.

[0031] For details, see Figure 3-Figure 4 The head assembly also includes a shell 7 and an insulating frame 6, the insulating frame 6 is fixedly arranged in the shell 7, the insulating frame 6 is provided with a high-pressure chamber and a low-pressure chamber, the high-pressure chamber and the low-pressure chamber are separated by a partition in the middle of the insulating frame 6, the high-pressure chamber is fixedly provided with a high-voltage transformer 4, a filament transformer 5 and a voltage-doubling rectifier plate 2, and the low-pressure chamber is fixedly provided with the X-ray tube 1, the anode current limiting plate and the cathode current limiting plate. The sealing interface plate 3 is fixedly arranged on one side of the shell 7. The shell 7 is provided with a ray port 8 facing the X-ray tube 1.

[0032] Furthermore, the insulating skeleton 6 is made of high-voltage materials such as Teflon by injection molding, and has high oil resistance. The insulating skeleton 6 isolates the high-voltage and low-voltage components in the head assembly, and there is no need to layout the components by increasing the insulation distance, so that the volume of the head assembly is significantly reduced. At the same time, the device layout inside the housing 7 is arranged in a manner that the voltage gradually increases, and is in turn a sealed interface board 3, a high-voltage transformer 4, a voltage-doubler rectifier board 2, and an X-ray tube 1. This layout reduces the discharge phenomenon caused by excessive voltage difference, and also eliminates additional insulation measures. The volume of the entire head assembly is greatly reduced, the space occupied is small, and it is more flexible.

[0033] For details, see Figure 5The interface circuit includes an interface controller U4, wherein the 9th pin, the 10th pin, the 11th pin and the 12th pin of the interface controller U4 are connected in series with a resistor and a diode circuit respectively and then connected to a 3.3V power supply, the 13th pin and the 14th pin are connected to the system communication control interface MJ2, the 7th pin and the 8th pin are connected to the debugging and service interface MJ8, and the interface controller U4 is connected in series with the system communication control interface MJ2 and the system communication control interface MJ2 in the connection loop, and the ground terminal is connected in series with the capacitors C20, C21, C58 and C61. The system communication control interface MJ2 uses the standard D-SUB9 interface and RS232 interface definition, and the baud rate is 115200bps by default, and can be set by the host computer system. The diodes CR1, CR2, CR14 and CR15 are TVS tubes, which are used to protect the voltage impact on the circuit to prevent damage to the serial port circuit. Capacitors C20, C21, C58, and C61 are filter capacitors that absorb interference signals. Interface controller U4 is an RS232 transceiver that converts the RS232 level received from the host system into a TTL level and outputs it to the main controller on the main control board, and converts the TTL level received from the main controller into a standard RS232 level and outputs it to the host system. The interface circuit enables users to set exposure parameters as needed without the need for complex analog circuits, and facilitates the expansion of functions.

[0034] Furthermore, the 9-12 pins of the interface controller U4 are also connected in series with an indicator light branch consisting of a resistor and a diode. The 9 pin is connected in series with a resistor R76 and a diode D20, the 10 pin is connected in series with a resistor R77 and a diode D21, the 11 pin is connected in series with a resistor R7 and a diode D4, the 12 pin is connected in series with a resistor R6 and a diode D23, and the diodes D3, D4, D20, and D21 are serial port indicator lights for indicating the current serial port transceiver status.

[0035] For details, see Figure 6The tube current control circuit includes inverters U29C, U30C, U30D, U33A, U33C and U33D. The positive input end of the follower U33A is connected in series with a resistor R140 and then connected to the Fil_Set signal transmitted by the main controller. The Fil_Set signal is a filament current reference signal after DAC analog-to-digital conversion after being sent by the main controller. The negative input end is connected in series with the 14th pin of the analog switch U30D. The input end of the inverter U29C is connected to the Ma_Loop_Ctl signal transmitted by the main controller. The Ma_Loop_Ctl signal is a control mode switching control signal sent by the main controller. The output is connected to the 16th pin of the analog switch U30D. At the same time, the Ma_Loop_Ctl signal is input to the 9th pin of the operational amplifier U33C. The positive input end of the operational amplifier U33C is connected in series with the resistor R140. Resistor R150 is connected to the Ma_Set signal transmitted by the main controller. The Ma_Set signal is a tube current reference signal sent by the main controller after DAC analog-to-digital conversion. The output end of the operational amplifier U33C is connected in series with resistor R151 and then connected to the positive input end of the operational amplifier U33D. The negative input end of the operational amplifier U33D is connected in series with resistor R152 and then connected to the Ma_Fb signal transmitted by the main controller. The Ma_Fb signal is the actual tube current fed back by the sampling circuit. Resistor R153 and capacitor C130 are also connected in series between the negative input end and the output end of the operational amplifier. Capacitor C131 is also connected in parallel between the resistor R153 and the capacitor C130. The output end of the operational amplifier U33D is connected to pin 10 of the operational amplifier U30C, and pin 15 of the analog switch U30D and pin 11 of the operational amplifier U30C are connected together to output Fil Prog signal, Fil Prog signal is the output filament current setting signal, and its size determines the size of the filament current, which directly determines the current size of the X-ray tube.

[0036] Specifically, the main controller includes a controller U1A and a controller U1B, and the controller U1A is communicatively connected with the tube current control circuit and the interface circuit to perform signal interaction.

[0037] Specifically, the main control board receives the exposure preparation PREP enable signal and the exposure start EXPOSURE enable signal transmitted from the host system through the interface MJ3, and sends the system exposure status signal (XRAY_ON). The main control board receives the interlock input signal transmitted from the host system through the interface MJ4, receives the emergency stop input signal transmitted from the host system through the interface MJ5, and outputs +12V voltage through the interface MJ6.

[0038] Working principle:

[0039] After the controller U1A receives the Prep enable signal given by the host system, it outputs the corresponding filament current Fil_Set, which then enters the positive input terminal of the follower U33A and is output from the follower U33A. When the controller U1 sets the AMa_Loop_Ctl signal to a low level, it outputs a high level to the 16th pin of the analog switch U30D after being inverted by the inverter U29C, so that its 14th and 15th pins are turned on, and the voltage signal output from the output terminal of the follower U33A is output to the Fil_Prog signal, thereby controlling the filament current and the tube current. At this time, the control terminal 9 pin of the op amp U30C is low, and the 10th and 11th pins are not turned on. This stage is a filament closed loop, and the tube current at this time depends entirely on the size of the tube current. Due to changes in filament impedance or temperature drift of components caused by factors such as the use time of the X-ray tube, the tube current output during this period of time or this control method often deviates from the set value.

[0040] When the circuit is basically stable at this time, usually about 5ms, the controller U1A sets Ma_Loop_Ctl to a high level. At this time, the analog switch U30D is closed and the 10 and 11 pins of the operational amplifier U30C are turned on.

[0041] The tube current setting value Ma_Set is input into the second-order compensation network composed of analog switch U33D after the tube current feedback value Ma_Fb via follower U33C. The deviation calculation result of the two is input into pins 10 and 11 of op amp U30C and then into Fil_Prog signal. At this time, the filament current value is completely determined by the deviation between the tube current setting value and the feedback value, and finally reaches dynamic balance. This stage is a tube current closed loop until the exposure ends. The tube current generated based on this control mechanism can ensure consistency with the set value, thereby achieving high control accuracy.

[0042] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. An X-ray source for a medical bone age machine and a bone densitometer, characterized in that: The invention comprises a main control component and a head component which are interconnected by cables, wherein the main control component comprises a main control board and a switching power supply, the head component comprises an X-ray tube, an anode current limiting plate, a cathode current limiting plate, a voltage doubler rectifier board and a sealed interface board, two ends of the X-ray tube are respectively connected to the anode current limiting plate and the cathode current limiting plate, the anode current limiting plate is connected to the E7 pin of the voltage doubler rectifier board, the cathode current limiting plate is connected to the E6 port of the voltage doubler rectifier board, the MJ1 and MJ2 ports of the voltage doubler rectifier board are connected to the sealed interface board, and the main control board is provided with an interface circuit, a tube current control circuit and a main controller.

2. The X-ray source for a medical bone age machine and bone densitometer according to claim 1, characterized in that: The E1, E2, E8 and E9 pins of the voltage doubler rectifier board are connected to the high voltage transformer, the E3-E5 pins are connected to one end of the filament transformer, and the other end of the filament transformer is connected to the E1 and E2 pins of the cathode current limiting board.

3. The X-ray source for a medical bone age machine and bone densitometer according to claim 1, characterized in that: The head assembly also includes a shell and an insulating frame, the insulating frame is fixedly arranged in the shell, the insulating frame is provided with a high-pressure chamber and a low-pressure chamber, the high-pressure chamber is fixedly provided with a high-voltage transformer, a filament transformer and the voltage-doubling rectifier plate, and the low-pressure chamber is fixedly provided with the X-ray tube.

4. The X-ray source for a medical bone age machine and bone densitometer according to claim 3, characterized in that: The shell is provided with a ray opening facing the X-ray tube.

5. The X-ray source for a medical bone age machine and bone densitometer according to claim 3, characterized in that: The sealing interface plate is fixedly arranged on one side surface of the shell.

6. The X-ray source for a medical bone age machine and bone densitometer according to claim 4, characterized in that: The interface circuit includes an interface controller U4, wherein pins 9, 10, 11 and 12 of the interface controller U4 are respectively connected in series with a resistor and a diode circuit and then connected to a 3.3V power supply, pins 13 and 14 are connected to the system communication control interface MJ2, and pins 7 and 8 are connected to the debugging and service interface MJ8. The interface controller U4 is also connected in series with diodes CR1, CR2, CR14, CR15 in the connection loop with the system communication control interface MJ2 and the system communication control interface MJ2 and then connected to the ground, and capacitors C20, C21, C58, C61 are also connected in series with the ground.

7. The X-ray source for a medical bone age machine and bone densitometer according to claim 6, characterized in that: Pins 9-12 of the interface controller U4 are also connected in series with indicator light branches consisting of resistors and diodes.

8. The X-ray source for a medical bone age machine and bone densitometer according to claim 1, characterized in that: The tube current control circuit includes inverters U29C, U30C, U30D, U33A, U33C and U33D. The positive input end of the follower U33A is connected in series with a resistor R140 and then connected to the Fil_Set signal transmitted by the main controller, and the negative input end is connected in series with the 14th pin of the analog switch U30D. The input end of the inverter U29C is connected to the Ma_Loop_Ctl signal transmitted by the main controller, and the output is connected to the 16th pin of the analog switch U30D. At the same time, the Ma_Loop_Ctl signal is input to the 9th pin of the operational amplifier U33C. The positive input end of the operational amplifier U33C is connected in series with a resistor R150 and then connected to the The Ma_Set signal transmitted by the main controller, the output end of the operational amplifier U33C is connected in series with the resistor R151 and then connected to the positive input end of the operational amplifier U33D, the negative input end of the operational amplifier U33D is connected in series with the resistor R152 and then connected to the Ma_Fb signal transmitted by the main controller, a resistor R153 and a capacitor C130 are also connected in series between the negative input end and the output end of the operational amplifier, a capacitor C131 is also connected in parallel between the resistor R153 and the capacitor C130, the output end of the operational amplifier U33D is connected to the 10th pin of the operational amplifier U30C, the 15th pin of the analog switch U30D and the 11th pin of the operational amplifier U30C are connected together to output the Fil Prog signal.

9. The X-ray source for a medical bone age machine and bone densitometer according to claim 1, characterized in that: The main controller includes a controller U1A and a controller U1B. The controller U1A is connected to the tube current control circuit and the interface circuit for signal exchange.

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