CN109833050A - X-ray automatic exposure control system and its control method - Google Patents
X-ray automatic exposure control system and its control method Download PDFInfo
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- CN109833050A CN109833050A CN201810801971.4A CN201810801971A CN109833050A CN 109833050 A CN109833050 A CN 109833050A CN 201810801971 A CN201810801971 A CN 201810801971A CN 109833050 A CN109833050 A CN 109833050A
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- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 1
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Abstract
A kind of X-ray automatic exposure control system and its control method, the X-ray automatic exposure control system includes: high pressure generator, for exporting X-ray to flat panel detector；Flat panel detector, for receiving X-ray and exporting image digital signal to interchanger, the flat panel detector includes AEC module and AED module, and the AED module exports enabling signal to AEC module after detecting X-ray, and the AEC module stops exposure for controlling high pressure generator；Interchanger for receiving the control signal of AEC module output and the image digital signal of flat panel detector output, and control signal is exported to high pressure generator, image digital signal is exported to computer.The present invention may be implemented to integrate AEC module and AED module in flat panel detector, start AEC module by AED module, avoids the problem of AEC harness must being used to connect between AEC module and high pressure generator, optimizes system, realize Digital Control.
Description
Technical field
The present invention relates to a kind of X-ray automatic exposure control system and its control methods, belong to technical field of medical equipment.
Background technique
AEC (auto-exposure control) technology is widely used in the general place system of X-ray, and principle is connect using devices such as ionisation chambers
The visible light of X-ray or X-ray conversion is received, and is converted into electric signal, AEC module does Integral Processing to electric signal, with exposure
The voltage value of the increase of time, accumulation increases, and when reaching some threshold voltage, AEC module controls high pressure generator and stops
Exposure.Fig. 1 is the schematic illustration of AEC technology in the prior art, is exposed as shown in Figure 1, high pressure generator 10 controls bulb 11
The transmitting of ray (X-ray) after exposed radiation passes through subject, is received by detector 20 to generate exposure image and export to electricity
Brain 40.Wherein, between subject and detector 20 be equipped with AEC module 30, the AEC module 30 by AEC control line 31 with
AEC interface 12 on high pressure generator 10 connects, so that controlling high pressure generator stops exposure.
Currently, existing AEC technology has the following problems.Firstly, the production of ionisation chamber is complicated, cost is very high.Secondly, by
Connecting communication is needed between AEC module and high pressure generator, AEC module needs dedicated AEC harness that could use, and high pressure occurs
Device output control signal control AEC module is started to work, and AEC module exports analog signal control high pressure generator and stops exposure,
And analog signal is easy decaying in long distance transmission and is interfered, and influences the accuracy and reliability automatically controlled.Finally,
AEC module and flat panel detector separation, greatly limit usage scenario.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the deficiencies of the prior art, provide a kind of X-ray automatic exposure
Control system and its control method may be implemented to integrate AEC module and AED module in flat panel detector, be started by AED module
AEC module avoids the problem of AEC harness must being used to connect between AEC module and high pressure generator, optimizes system, real
Digital Control is showed；The analog signal that AEC module exports is converted into digital signal using analog-to-digital conversion module, has been prevented remote
Range simulation signal decaying and vulnerable to interference the problem of.
The technical problem to be solved by the present invention is to what is be achieved through the following technical solutions:
The present invention provides a kind of X-ray automatic exposure control system, and the X-ray automatic exposure control system includes: height
Generator is pressed, for exporting X-ray to flat panel detector；Flat panel detector, for receiving X-ray and exporting image digital signal
To interchanger, the flat panel detector includes AEC module and AED module, and the AED module exports after detecting X-ray to be opened
For dynamic signal to AEC module, the AEC module stops exposure for controlling high pressure generator；Interchanger, for receiving AEC module
The image digital signal of control signal and the flat panel detector output of output, and control signal is exported to high pressure generator,
Image digital signal is exported to computer.
In order to export enabling signal, the AED module includes illuminant module and processing module, and the illuminant module includes dodging
Bright body and AED photodiode, the scintillator are used to after X-ray to be converted to visible light signal export to two pole of AED photoelectricity
Pipe, the AED photodiode export after optical signal is converted to electric signal to processing module for will be seen that；The processing module
Including pre-amplifier, post-amplifier and hysteresis comparator.
In order to export control signal, the AEC module include integral and conditioning circuit, ionisation chamber/AEC photodiode,
Analog-to-digital conversion module, the analog-to-digital conversion module are used to the analog signal that integral and conditioning circuit issue being converted to digital letter
Number.
In order to export control signal and image digital signal respectively, the interchanger is equipped with the first output interface and second
Output interface, first output interface by D/A converter module on high pressure generator AEC interface or spectrum assignment connect
Mouth connection, the control signal for issuing AEC module are exported to high pressure generator, and are controlled high pressure generator and stopped exposure,
Second output interface is for exporting image digital signal to computer.
Preferably, the interchanger is connect by high speed Ethernet with high pressure generator, flat panel detector and computer.
The present invention also provides a kind of control method of X-ray automatic exposure control system, the X-ray auto-exposure control
System includes: high pressure generator, flat panel detector and interchanger, and the flat panel detector includes AEC module and AED module,
The control method includes:
S1: starting high pressure generator starts to expose；
Output enabling signal to AEC module, AEC module is started to work after S2:AED module detects X-ray；
S3: when the voltage value of accumulation reaches a threshold voltage, one control signal of AEC module output to high pressure generator,
High pressure generator stops exposure.
Preferably, the control signal is digital signal.
The AEC module output one controls signal to the raw implement body of high pressure are as follows: integral and conditioning in the AEC module
Circuit issues analog signal, and the analog-to-digital conversion module in the AEC module converts analog signals into digital signal, the plate
Detector exports the digital signal to interchanger by high speed Ethernet, the interchanger by the digital signal export to
The D/A converter module of high pressure generator.
Further include S4 after S3: flat panel detector exports image digital signal to computer by interchanger.
In conclusion the present invention may be implemented to integrate AEC module and AED module in flat panel detector, opened by AED module
Dynamic AEC module avoids the problem of AEC harness must being used to connect between AEC module and high pressure generator；Utilize analog-to-digital conversion
The analog signal that AEC module exports is converted to digital signal by module, prevented the decaying of remote analog signal transmission signal and
The problem of vulnerable to interference, system is optimized, Digital Control is realized.
In the following with reference to the drawings and specific embodiments, technical solution of the present invention is described in detail.
Detailed description of the invention
Fig. 1 is the schematic illustration of AEC technology in the prior art；
Fig. 2 is the schematic illustration of X-ray automatic exposure control system of the present invention；
Fig. 3 is the block diagram of processing module in AED module of the present invention；
Fig. 4 is AED preamplifying circuit schematic diagram in AED resume module module of the present invention；
Fig. 5 is the block diagram of AEC module of the present invention；
Fig. 6 is the integrating circuit figure of AEC module of the present invention；
Fig. 7 is the integration sequence figure of AEC module of the present invention；
Connection block diagram of the Fig. 8 between interchanger of the present invention and high pressure generator；
Fig. 9 is the work flow diagram of X-ray automatic exposure control system of the present invention.
Specific embodiment
Fig. 2 is the schematic illustration of X-ray automatic exposure control system of the present invention.As shown in Fig. 2, the present invention provides one kind
X-ray automatic exposure control system, the X-ray automatic exposure control system include high pressure generator 100, flat panel detector
200 and interchanger 300.
The high pressure generator 100 includes bulb 110, for exporting X-ray to flat panel detector 200.
The flat panel detector 200 exports image digital signal to interchanger 300 for receiving X-ray.The plate
Detector 200 includes X ray image detecting module, and the X ray image detecting module includes scintillator layers, amorphous silicon photoelectricity two
Pole pipe array (or amorphous silicon film transistor array), horizontal drive circuit and picture signal reading circuit.It is detected positioned at plate
The scintillator layers (cesium iodide scintillation crystal, x-ray fluorescence body etc.) of device 200 can be converted to incident radioscopic image visible
Light image, the amorphous silicon photodiodes array under scintillator layers can will be seen that light image is converted to charge image, row
Driving circuit and picture signal reading circuit export after charge image can be converted to digital signal to interchanger 300.It needs
It is noted that the protection scope that the structure of above-mentioned flat panel detector 200 is not intended to limit the invention, may be used also in practical application
Using other types of detector.
AEC module 210 and AED module 220 are additionally provided in the flat panel detector 200.The AED module 220 is detecting
Enabling signal is exported after to X-ray to AEC module 210, the AEC module 210 is in the starting letter for receiving the output of AED module 220
It after number, starts to work, the High voltage output of high pressure generator 100 is controlled by interchanger 300.
The AED module 220 includes illuminant module and processing module.The illuminant module includes scintillator and AED photoelectricity
X-ray is converted to after visible light signal output to AED photodiode by diode, the scintillator, later two pole of AED photoelectricity
Pipe is it will be seen that optical signal exports after being converted to electric signal to processing module.Specifically, scintillator and AED photodiode can be with
Being wholely set can also be independently arranged, and when scintillator and AED photodiode are independently arranged, need on flat panel detector 200
Corresponding scintillator opens up aperture, so that the visible light signal that scintillator issues is received by AED photodiode；When scintillator and
When AED photodiode is wholely set, i.e., the AED photodiode of scintillator, nothing on flat panel detector 200 are had using surface
Aperture need to be opened up.Fig. 3 is the block diagram of processing module in AED module of the present invention；Fig. 4 is AED in AED resume module module of the present invention
Preamplifying circuit schematic diagram.As shown in Figure 3 and Figure 4, the processing module includes pre-amplifier, post-amplifier and sluggishness
Comparator, X-ray is converted to visible light signal by scintillator (not shown), after photodiode D2 receives visible light signal
Electric signal is converted thereof into, amplifies the signal using pre-amplifier and post-amplifier, then enters back into hysteresis comparator,
With the threshold value comparison being preset in hysteresis comparator, signal is when being greater than threshold value, and hysteresis comparator output high level enabling signal is extremely
AEC module 210, the judgement of AED module detect X-ray, indicate X-ray exposure.
Fig. 5 is the block diagram of AEC module 210 of the present invention.As shown in figure 5, the AEC module 210 includes ionisation chamber/AEC light
Electric diode, integral and conditioning circuit and analog-to-digital conversion module.
Wherein, the analog-to-digital conversion module includes analog-digital converter ADC and microprocessing unit, and the microprocessing unit can
Think FPGA (Field-Programmable Gate Array, i.e. field programmable gate array), ARM (Advanced RISC
Machines, arm processor) or MCU (Microcontroller Unit, micro-control unit) etc..
The ionisation chamber/AEC photodiode for receiving X-ray, convert thereof into after electric signal output to integral and
Conditioning circuit.When using ionisation chamber, since ionisation chamber is designed using special material, X-ray passes through its decaying very little, because
This, the ionisation chamber can be set in flat panel detector 200 close to the side of bulb 110；When using AEC photodiode D1
When, it is small in size due to AEC photodiode, it can be set inside flat panel detector 200.It should be noted that AEC light
The surface of electric diode D1 has scintillator, and the present invention is not limited thereto, sudden strain of a muscle can also be separately provided in flat panel detector 200
Bright body.In the present invention, it is preferred to using AEC photodiode, since the production of ionisation chamber is complicated and costly, using AEC
Photodiode can effectively reduce production cost, and the AEC photodiode of small volume is arranged in flat panel detector 200
In can reduce the volume of flat panel detector 200, increase the portability of flat panel detector 200, it is user-friendly.
Fig. 6 is the integrating circuit figure of AEC module of the present invention；Fig. 7 is the integration sequence figure of AEC module of the present invention.Such as Fig. 6 and
Shown in Fig. 7, it is described integral and conditioning circuit receive AED module 220 output enabling signal after start to work, to ionisation chamber/
The electric signal that AEC photodiode issues is integrated and is compared, and with the increase of time for exposure, the voltage value of accumulation increases,
When reaching some threshold voltage, AEC module 210 controls high pressure generator and stops exposure.
You need to add is that the present invention is not intended to limit ionisation chamber/AEC photodiode quantity, those skilled in the art
Multiple ionisation chamber/AEC photodiodes can be set in different positions according to actual needs, so that AEC module 210 can
To carry out detection integral to multiple regions.In the present embodiment, ionisation chamber/AEC photodiode quantity is 3.
The analog-to-digital conversion module is used to the analog signal that integral and conditioning circuit issue being converted to digital signal, later
Flat panel detector 200 is exported the digital signal to interchanger 300 by high speed network.
Connection block diagram of the Fig. 8 between interchanger of the present invention and high pressure generator.As shown in Fig. 8 and Fig. 2, the interchanger
300 are equipped with the first output interface and the second output interface.First output interface passes through D/A converter module 120 and high pressure
AEC interface or the connection of spectrum assignment interface on generator 100, the control signal output for issuing AEC module 210 are supreme
Generator 100 is pressed, and controls high pressure generator 100 and stops exposure.The D/A converter module 120 includes digital analog converter DAC
And microprocessing unit, the microprocessing unit can be FPGA (Field-Programmable Gate Array, i.e. scene
Programmable gate array), ARM (Advanced RISC Machines, arm processor) or MCU (Microcontroller
Unit, micro-control unit) etc..Second output interface is connect with computer, for exporting image digital signal to computer.
It should be noted that due to being provided with D/A converter module and analog-to-digital conversion module in the present invention, after converting
Digital signal can be transmitted by high speed network (high speed Ethernet), such as 100 m ethernet network, gigabit Ethernet network, 10,000,000,000 with
Too net network (including kilomega optic fiber and 10,000,000,000 optical fiber).So that AEC module 210, which does not need transmission line analog signal, is connected to high pressure
Generator has prevented the decaying of remote analog signal transmission signal and the problem of vulnerable to interference.In addition, in a high-speed network,
The network transformer for insulation blocking can also be increased, to enhance signal, keep its transmission range farther, anti-interference ability is more
By force.
The present invention also provides a kind of control methods applied in above-mentioned X-ray automatic exposure control system, comprising:
S1: starting high pressure generator starts to expose；
Output enabling signal to AEC module, AEC module is started to work after S2:AED module detects X-ray；
S3: when the voltage value of accumulation reaches a threshold voltage, one control signal of AEC module output to high pressure generator,
High pressure generator stops exposure.
Preferably, the control signal is digital signal.
The AEC module output one controls signal to the raw implement body of high pressure are as follows: integral and conditioning in the AEC module
Circuit issues analog signal, and the analog-to-digital conversion module in the AEC module converts analog signals into digital signal, the plate
Detector exports the digital signal to interchanger by high speed Ethernet, the interchanger by the digital signal export to
The D/A converter module of high pressure generator.
Further include S4 after S3: flat panel detector exports image digital signal to computer by interchanger.
Fig. 9 is the work flow diagram of X-ray automatic exposure control system of the present invention.As shown in figure 9, X-ray in the present invention
The course of work of automatic exposure control system is as follows:
Flat panel detector 200 is arranged in place according to the setting of the film making position of subject, starts high pressure
Device 100 starts to expose.Enabling signal is exported after AED module 220 detects X-ray to AEC module 210, AEC module 210 is opened
Beginning work.Specifically, received X-ray is converted to Integral Processing after electric signal by AEC module 210, when the voltage value of accumulation
When reaching a threshold voltage, an analog signal for stopping exposure for controlling high pressure generator is issued, the analog signal is by mould
Number conversion module is gone out by high speed network transmission to interchanger 300 after being converted to digital signal, and the interchanger 300 is through network solution
Analysis latter aspect is exported digital signal to high pressure generator 100 by D/A converter module, to control high pressure generator exposure
Light cut-off, is on the other hand sent to computer for the image digital signal that X ray image detecting module exports, required for obtaining
Image, it is ensured that outstanding image effect.
In conclusion the present invention may be implemented to integrate AEC module and AED module in flat panel detector, opened by AED module
Dynamic AEC module avoids the problem of AEC harness must being used to connect between AEC module and high pressure generator, optimizes system,
Realize Digital Control；The analog signal that AEC module exports is converted into digital signal using analog-to-digital conversion module, is prevented
Remote analog signal transmission signal decaying and the problem of vulnerable to interference.
Claims (9)
1. a kind of X-ray automatic exposure control system, which is characterized in that the X-ray automatic exposure control system includes:
High pressure generator (100), for exporting X-ray to flat panel detector (200)；
Flat panel detector (200), for receiving X-ray and exporting image digital signal to interchanger (300), the plate detection
Device (200) includes AEC module (210) and AED module (220), and the AED module (220) exports starting after detecting X-ray
For signal to AEC module (210), the AEC module (210) stops exposure for controlling high pressure generator (100)；
Interchanger (300), for receiving the control signal of AEC module (210) output and the figure of flat panel detector (200) output
It exports as digital signal, and by control signal to high pressure generator (100), image digital signal is exported to computer.
2. X-ray automatic exposure control system as described in claim 1, which is characterized in that the AED module (220) includes
Illuminant module and processing module, the illuminant module include scintillator and AED photodiode, and the scintillator is for penetrating X
Output is to AED photodiode after line is converted to visible light signal, and the AED photodiode is for it will be seen that optical signal conversion
For output after electric signal to processing module；The processing module includes pre-amplifier, post-amplifier and hysteresis comparator.
3. X-ray automatic exposure control system as described in claim 1, which is characterized in that the AEC module (210) includes
Integral and conditioning circuit, ionisation chamber/AEC photodiode, analog-to-digital conversion module, the analog-to-digital conversion module for will integrate with
The analog signal that conditioning circuit issues is converted to digital signal.
4. X-ray automatic exposure control system as claimed in claim 3, which is characterized in that the interchanger (300) is equipped with
First output interface and the second output interface, first output interface pass through D/A converter module (120) and high pressure generator
(100) AEC interface or the connection of spectrum assignment interface on, for exporting the control signal that AEC module (210) issue to high pressure
Generator (100), and control high pressure generator (100) and stop exposure, second output interface is used for image digital signal
It exports to computer.
5. X-ray automatic exposure control system as claimed in claim 4, which is characterized in that the interchanger (300) passes through height
Fast Ethernet is connect with high pressure generator (100), flat panel detector (200) and computer.
6. a kind of control method of X-ray automatic exposure control system, which is characterized in that X-ray auto-exposure control system
System includes: high pressure generator, flat panel detector and interchanger, and the flat panel detector includes AEC module and AED module, institute
Stating control method includes:
S1: starting high pressure generator starts to expose；
Output enabling signal to AEC module, AEC module is started to work after S2:AED module detects X-ray；
S3: when the voltage value of accumulation reaches a threshold voltage, one control signal of AEC module output to high pressure generator, high pressure
Generator stops exposure.
7. control method as claimed in claim 6, which is characterized in that the control signal is digital signal.
8. control method as claimed in claim 7, which is characterized in that the one control signal of AEC module output to high pressure
Raw implement body are as follows: integral and conditioning circuit in the AEC module issue analog signal, the analog-to-digital conversion in the AEC module
Module converts analog signals into digital signal, the flat panel detector by the digital signal by high speed Ethernet export to
Interchanger, the interchanger export the digital signal to the D/A converter module of high pressure generator.
9. control method as claimed in claim 6, which is characterized in that further include S4 after S3: flat panel detector is by picture number
Word signal is exported by interchanger to computer.
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Cited By (3)
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| CN112654125A (en) * | 2021-01-08 | 2021-04-13 | 上海昊博影像科技有限公司 | High-voltage generator exposure control device and system based on wireless communication |
| CN112690811A (en) * | 2020-12-23 | 2021-04-23 | 上海奕瑞光电子科技股份有限公司 | Automatic exposure control system and automatic exposure control method |
| CN112890838A (en) * | 2021-01-08 | 2021-06-04 | 上海昊博影像科技有限公司 | Automatic exposure control method and flat panel detector |
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