CN108008435A - The dose monitoring system and observation circuit of medical accelerator - Google Patents
The dose monitoring system and observation circuit of medical accelerator Download PDFInfo
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- CN108008435A CN108008435A CN201711208247.2A CN201711208247A CN108008435A CN 108008435 A CN108008435 A CN 108008435A CN 201711208247 A CN201711208247 A CN 201711208247A CN 108008435 A CN108008435 A CN 108008435A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/12—Provision for actuation of an alarm
- G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
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Abstract
The present invention relates to a kind of dose monitoring system of medical accelerator.Dose monitoring system includes detecting module, signal processing module, detection module and control module；Detecting module is used for detecting ionizing radiation, and exports electric signal；Signal processing module is connected with detecting module, for amplifying electric signal, and exports amplified signal；Detection module is connected with signal processing module, and detection module is used to detect amplified signal, and output detection value；Control module is connected with signal processing module and detection module respectively, wherein, signal processing module is adjustable to the gain amplifier of electric signal, and control module is used to be adjusted signal processing module to gain amplifier corresponding with electric signal according to detected value and default detection threshold value.The invention further relates to a kind of observation circuit.Above-mentioned dose measurement system and observation circuit, the testing result of detection module is all relatively more accurate, so that the monitoring result of dose monitoring system is more accurate.
Description
Technical field
The present invention relates to medical accelerator technical field, the dose monitoring system and prison of more particularly to a kind of medical accelerator
Slowdown monitoring circuit.
Background technology
At present, most commonly used in radiotherapy is medical accelerator.Medical accelerator produces ionising radiation, using electricity
Patient is treated from radiation.The effect of radiotherapy is directly related with the dose of radiation that tumour is absorbed.For effectively treatment
Tumour, needs to set dose monitoring system, effect is to show the radiant output of electron linear accelerator, in terms of in radiotherapy
Calculate the absorbed dose of radiation for being treated position under prescribed conditions.
Dose monitoring system includes ionisation chamber, measuring circuit and controller.Ionisation chamber is used for the electricity for detecting medical accelerator
From radiation, and export electric signal.Measuring circuit is used to measure the electric signal.Controller calculates electricity according to the measured value of measuring circuit
From the dosage of radiation.But traditional dose monitoring system, when the ionising radiation of medical accelerator is larger or smaller, measurement electricity
Road can export saturation or can't detect the electric signal of ionisation chamber output, i.e. the testing result of measuring circuit is inaccurate, causes agent
The monitoring result for measuring monitoring system is inaccurate.
The content of the invention
Based on this, it is necessary to for above-mentioned traditional dose monitoring system, when the input charge of ionisation chamber is larger or smaller,
The testing result of measuring circuit is inaccurate, the problem of causing the monitoring result of dose monitoring system inaccurate, there is provided a kind of medical
The dose monitoring system and observation circuit of accelerator.
A kind of dose monitoring system of medical accelerator, including detecting module, signal processing module, detection module and control
Module；The detecting module is used for detecting ionizing radiation, and exports electric signal；The signal processing module and the detecting module
Connection, for amplifying the electric signal, and exports amplified signal；The detection module is connected with the signal processing module, institute
Detection module is stated to be used to detect the amplified signal, and output detection value；The control module respectively with the signal processing mould
Block is connected with detection module, wherein, the signal processing module is adjustable to the gain amplifier of the electric signal, the control module
For the signal processing module to be adjusted to corresponding with the electric signal according to the detected value and default detection threshold value
Gain amplifier.
In one of the embodiments, the signal processing module includes amplifier, and the multiple capacitances being arranged in parallel
Circuit, the output terminal of the amplifier feed back to the input terminal of the amplifier by the multiple condenser network；The control
Module whether the connection that controls the multiple condenser network by adjusting the gain of the amplifier.
In one of the embodiments, each condenser network includes the relay and capacitance being connected in series, the control
Whether molding block realizes the connection of the condenser network by controlling the relay.
In one of the embodiments, the detecting module includes ionisation chamber and detecting element, and the detecting element is set
In on a pole plate of the ionisation chamber；The detecting element is produced for collecting the ionisation chamber under the action of ionising radiation
Ionization electric charge, and export electric signal；The input terminal of the signal processing module is connected with the output terminal of the detecting element, institute
State signal processing module to be used to amplify the electric signal, and the electric signal is converted into output of pulse signal.
In one of the embodiments, the detection module includes sampling unit, the input terminal of the sampling unit and institute
The output terminal connection of signal processing module is stated, the crest voltage that the sampling unit is used to detect the pulse signal is as detection
It is worth and exports to the control module.
In one of the embodiments, the sampling unit includes sampling hold circuit and comparator；The sampling is kept
The input terminal of circuit is connected with the output terminal of the signal processing module, and the sampling hold circuit is used to detect the pulse letter
Number peak value；The comparator includes first input end and the second input terminal；The first input end and the signal processing mould
The output terminal connection of block, second input terminal are connected with the output terminal of the sampling hold circuit；The comparator will export
Signal is sent to the sampling hold circuit, to control the working status of the sampling hold circuit.
In one of the embodiments, the detection module further includes converting unit, the input terminal of the converting unit with
The output terminal connection of the sampling unit, the converting unit are used to the peak value of the pulse signal being converted to digital signal simultaneously
Export to the control module.
A kind of observation circuit, for detecting the electric signal of ionisation chamber output.The observation circuit includes signal processing module, inspection
Survey module and control module；The signal processing module is connected with the ionisation chamber, for amplifying the electric signal, and is exported and is put
Big signal；The detection module is connected with the signal processing module, and the detection module is used to detect the amplified signal, and
Output detection value；The control module is connected with the signal processing module and detection module respectively, wherein, the signal processing
Module is adjustable to the gain amplifier of the electric signal, and the control module is used for according to the detected value and default detection threshold value
The signal processing module is adjusted to gain amplifier corresponding with the electric signal.
In one of the embodiments, the signal processing module includes amplifier, and the multiple capacitances being arranged in parallel
Circuit, the output terminal of the amplifier feed back to the input terminal by the multiple condenser network；The control module passes through
The connection for controlling the multiple condenser network or not adjust the gain of the amplifier.
In one of the embodiments, each condenser network includes the relay and capacitance being connected in series, the control
Whether molding block realizes the connection of the condenser network by controlling the relay.
The dose monitoring system and observation circuit of above-mentioned medical accelerator, the signal processing module have different gains
Gear, the control module can be according to the energy of the default ionising radiation of the medical accelerator by the signal processing mould
Block is adjusted to corresponding gain shift, so that electric signal is amplified corresponding multiple by signal processing circuit.Should by detection module detection
Amplified signal, and output detection value.The gain shift of suitable signal processing module can make it that amplified signal is suitable, so that
It is accurate to obtain detected value.
Brief description of the drawings
Fig. 1 is the schematic diagram of the dose monitoring system of the medical accelerator of an embodiment；
Fig. 2 is the structure diagram of the ionisation chamber of an embodiment；
Fig. 3 is the amplifier of the present embodiment and the schematic diagram of condenser network；
Fig. 4 is the schematic diagram of the detecting module of an embodiment；
Fig. 5 is the schematic diagram of the detecting module of another embodiment；
Fig. 6 is the schematic diagram of the observation circuit of an embodiment.
Embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
Medical accelerator is a kind of particle accelerator device for being used for carrying out tumour radiotherapy.Charged particle accelerator
It is the electromagnetic installing that various different types of charged particles are accelerated to by the electric field of different shape higher energy by artificial means
Put.Then the ionising radiation for radiotherapy is produced by high energy particle strike heavy metal target.In the present embodiment, medical acceleration
Device is by taking electron linear accelerator as an example.Electron linear accelerator utilizes the high energy electron and HIGH-POWERED MICROWAVES with certain energy
Microwave electric field interacts, so as to obtain the energy of higher.At this moment high energy electron strike heavy metal target, produces ionising radiation, than
Such as X-ray, make x-ray treatment.
Fig. 1 is the schematic diagram of the dose monitoring system 100 of the medical accelerator in the present embodiment.A kind of medical accelerator
Dose monitoring system 100 is used for the dosage for monitoring the ionising radiation of medical accelerator.As shown in Figure 1, the dose monitoring system 100
Including detecting module 110, signal processing module 120, detection module 130 and control module 140.Detecting module 110 is used to detect
Ionising radiation, and electric signal is exported, electric signal reflects the energy of ionising radiation.Signal processing module 120 connects with detecting module 110
Connect, for amplifying electric signal and exporting amplified signal.Signal processing module 120 is adjustable to the gain amplifier of electric signal.Detect mould
Block 130 is connected with signal processing module 120, and detection module is used to detect amplified signal, and output detection value.Control module 140
It is connected respectively with signal processing module 120 and detection module 130, control module 140 is according to detected value and default detection threshold value
Signal processing module is adjusted to gain amplifier corresponding with electric signal, and control module 140 calculates ionization spoke according to detected value
The dose value penetrated.
The dose monitoring system of above-mentioned medical accelerator, signal processing module 120 adjust the gain amplifier of electric signal,
Control module 140 can be adjusted signal processing module 120 to corresponding with electric signal according to detected value and default detection threshold value
Gain amplifier so that electric signal is amplified corresponding multiple by signal processing module 120.Amplification letter is detected by detection module 130
Number, and output detection value.The suitable gain of signal processing module 120 can make it that amplified signal is suitable, so that detection
Value is accurate.For example, when the detected value of detection module is larger, show that the electric signal that detecting module 110 exports is larger, control module
The gain shift of signal processing module 120 is adjusted to less gear by 140 so that signal processing module 120 amplifies electric signal
Corresponding multiple, avoid amplified signal it is excessive in the case of, the situation for saturation occur of detection module 130.Work as detected value
When smaller, the electric signal that detecting module 110 exports is smaller, and the gain shift of signal processing module 120 is adjusted to by control module 140
Larger gear so that electric signal is amplified corresponding multiple by signal processing module 120, avoids the too small situation of amplified signal
Under, detection module 130 can't detect the situation of amplified signal, ensure that dose measurement system has higher sensitivity.Therefore,
The testing result of detection module 130 is all relatively more accurate, so that the dose value that control module 140 is calculated according to detected value is than calibrated
Really, the monitoring result of dose monitoring system 100 is more accurate.
Detecting module 110 receives ionising radiation, and ionising radiation is converted to electric signal.Detecting module 110 includes ionization
Room 111 and detecting element 111C.Fig. 2 is the structure diagram of the ionisation chamber 111 of the present embodiment.Ionisation chamber 111 is by difference
Two electrode plates (electrode plate 111A and electrode plate 111B) of current potential and therebetween medium composition.Medium in ionisation chamber 111 exists
Ionization electric charge is produced under the action of ionising radiation.I.e. ionising radiation produces ionization ion pair in media as well, under the action of electric field,
Negative ions drift about to two electrode plates respectively, form ionization electric charge.The electrode plate that detecting element 111C is disposed therein
On (such as 111A).Detecting element 111C is used to collect the ionization electric charge in ionisation chamber, and exports electric signal.Due to ionization electric charge with
The energy (intensity) of ionising radiation is directly proportional, therefore the size for measuring the electric charge can obtain the intensity of ionising radiation so that ionization
The measurement of the intensity of radiation is simple.In the present embodiment, what detecting element 111C was collected is positive ionization electric charge, therefore, detecting element
111C exports positive charge signal.The input terminal of the output terminal of detecting element 111C and pretreatment unit 121 and it is connected.
Fig. 3 is the amplifier of the present embodiment and the schematic diagram of condenser network.The input terminal of signal processing module 120 and detection
The output terminal connection of element 111C, signal processing module 120 is used to amplify electric signal, and it is defeated to convert electrical signals to pulse signal
Go out.Signal processing module 120 includes amplifier 121A, and the multiple condenser networks being arranged in parallel, the output terminal of amplifier lead to
Cross the input terminal that multiple condenser networks feed back to amplifier.Control module whether controlling the connection of multiple condenser networks by adjusting
The gain of amplifier.In the present embodiment, amplifier 121A can be charge sensitive preamplifier, and amplifier 121A outputs are negative
Pulse signal.Each condenser network includes the relay 121B and capacitance C being connected in series, and control module 140 is by controlling relay
Whether device 121B realizes the connection of condenser network.
The capacitance of each capacitance C can be set according to demand, and the capacitance of any two capacitance C can it is identical can also
It is different.When dose monitoring system works, whether each capacitance C is accessed in the circuit of amplifier 121A is controlled by control module.No
In the case of same capacitance C in combination, the gain of amplifier 121A is different.Therefore, control module can be by adjusting amplifier
The size of total capacitance value in 121A adjusts gain.
In the present embodiment, control module 140 controls the break-make of corresponding condenser network by controlling controlling switch 121B,
Exemplarily, controlling switch 121B is relay, its repeat circuit, which has, to be opened with closing two states, the open shape of relay
State corresponds to whether corresponding capacitance C works with closed mode respectively.In this way, control module 140 can be by controlling relay
State controls whether capacitance C works, to achieve the purpose that to control the gain of amplifier 121A.
Detection module 130 includes sampling unit 131, the input terminal of sampling unit 131 and the output of signal processing module 120
End connection, sampling unit 131 are used for crest voltage and the output for detecting positive pulse.The positive pulse that signal processing module 120 exports
Crest voltage reflection ionising radiation actual dose, therefore, detect the crest voltage of positive pulse, and input control module 140
It can obtain the dose value of ionising radiation.
Specifically, sampling unit 131 includes sampling hold circuit 131A and comparator 131B.Sampling hold circuit 131A's
The output terminal of input terminal and reverse amplification circuit connects.Sampling hold circuit 131A is used for the crest voltage for detecting positive pulse.Than
Including first input end and the second input terminal compared with device 131B, the output terminal of first input end and reverse amplification circuit connects, and second
Input terminal is connected with the output terminal of sampling hold circuit 131A, and comparator 131B will export signal (S/H signals) and send to sampling
Holding circuit 131A.Comparator 131B is sent signal is exported to sampling hold circuit 131A, to control sampling hold circuit
The work of 131A.The two-way input (input of first input end and the second input terminal) of comparator 131B, is all the way anti-phase amplification
The positive pulse of circuit output, the output signal kept all the way for sampling.During positive pulse voltage rises, since sampling keeps electricity
The sluggishness of road 131A, the output of reverse amplification circuit are consistently greater than the output level that sampling is kept, and S/H signals are sampled signal.
When S/H signals are sampled signal, the output of sampling hold circuit 131A follows the output of input, i.e. sampling hold circuit 131A
For positive pulse voltage.When the positive pulse of reverse amplification circuit is begun to decline, the output of reverse amplification circuit is less than sampling holding
During output level, S/H signal condition saltus steps, sampling hold circuit 131A keeps current magnitude of voltage, i.e., current magnitude of voltage can
It is considered the crest voltage of positive pulse.Therefore, when S/H signals is keep signal, the current electricity of sampling hold circuit 131A outputs
Pressure value.By the orderly work of sampling hold circuit 131A and comparator 131B, sampling unit 131 can be accurately detected just
The crest voltage of pulse.
Detection module 130 further includes converting unit 132, the input terminal of converting unit 132 and the output terminal of sampling unit 131
Connection, converting unit 132 are used to crest voltage being converted to digital signal and export to control module 140.In this way, control module
140 receive digital signal so that the anti-interference enhancing of control module 140.In the present embodiment, converting unit 132 turns for digital-to-analogue
Parallel operation ADC.The input terminal of digital analog converter is connected with the output terminal of sampling hold circuit 131A, is examined with receiving sampling unit 131
The crest voltage measured.
Control module 140 can calculate the dose value of ionising radiation according to the detected value of detection module 130, and according to dosage
What the size of value adjusted the ionising radiation of medical accelerator in time goes out beam frequency so that the ionising radiation of medical accelerator goes out beam
Frequency meets the requirements, so that the dosage of medical accelerator meets the requirements, ensures that therapeutic effect is preferable.If control module
140 are calculated dose value beyond preset value, and control module 140 can control medical accelerator to terminate work, cut-out ionization spoke
The output penetrated, ensures that the dosage that patient receives is not exceeded, avoids patient from coming to harm.
In the present embodiment, control module 140 can be according to agent of the temperature and air pressure that ionisation chamber 111 works to ionising radiation
Amount compensates calculating.Therefore, control module 140 is according to the detected value of detection module 130, and the temperature that ionisation chamber 111 works
With the dose value of air pressure COMPREHENSIVE CALCULATING ionising radiation, to realize the accurate monitoring of ionizing radiation dose.
Dose monitoring system 100 further includes voltage inspection module 150.Voltage inspection module 150 is used to detect ionisation chamber 111
Two pole plates between operating voltage, voltage inspection module 150 sends operating voltage to control module 140.In this way, dosage
Monitoring system 100, which can be realized, is monitored the operating voltage of ionisation chamber 111.When operating voltage is abnormal, control module 140
Signal an alert, and control medical accelerator to stop transmitting ionising radiation, so as to terminate radiotherapy.
Dose monitoring system 100 further includes analog module, the output terminal of analog module and the input of signal processing module 120
End connection, analog module are used to produce analog signal, and analog signal is used for the electric signal of analog detection module 110, with to signal
The circuit that processing module 120, detection module 130 and control module 140 are formed carries out emulation testing.Pass through analog module, so that it may
To examine whether the circuit that signal processing module 120, detection module 130 and control module 140 are formed exception, convenient investigation occurs
The failure of dose measurement system.Specifically, in the present embodiment, analog module includes charge simulation output unit, and charge simulation is defeated
The output terminal for going out unit is connected with the input terminal of amplifier 121A.When dose monitoring system 100 occurs abnormal, the simulation is used
Electric charge output unit replaces detecting module 110 to export electric signal, and the dose value monitored by dose monitoring system 100 can
Judge the abnormal shape for the circuit that detecting module 110 is formed with signal processing module 120, detection module 130 and control module 140
Condition, beneficial to the failure of further investigation dose monitoring system 100.And for signal processing module 120, detection module 130 and control
Exception in the circuit that molding block 140 is formed can then use the abnormality judgment method in circuit to go to investigate.
Fig. 4 is the schematic diagram of the detecting module of an embodiment.In one embodiment, signal processing module, detection module and control
Molding block composition dose detection circuit.The quantity of dose measurement circuit is multiple.Detecting module further includes multiple identical detections
Hold 111D.Multiple end of probe are arranged on a pole plate of ionisation chamber non-overlappingly, and end of probe and detecting element 111C
It is non-overlapping.End of probe 111D is used for the ionization electric charge for collecting corresponding position.Each end of probe 111D and detecting element 111C
Each connected with corresponding dose measurement circuit.In the present embodiment, the structure of detecting module is referred to the implementation shown in Fig. 2
Example.The quantity of end of probe 111D is 4, area equation, and is symmetrically distributed on the same pole plate of ionisation chamber, and and detecting element
111C is located on same pole plate.Corresponding position can be detected respectively by each end of probe 111D and corresponding dose measurement circuit
Ionising radiation value, and ionising radiation value and ionizing radiation dose have default proportionate relationship.Therefore, each end of probe 111D
It can detect an ionizing radiation agent value, the dosage detected by contrasting each end of probe 111D and detecting element 111C
Value, you can learn the uniformity of ionising radiation.If the uniformity of ionising radiation is not inconsistent standardization, control module can be adjusted suitably
Whole ionising radiation goes out beam line, so that ionising radiation is uniform.
Fig. 5 is the schematic diagram of the detecting module of another embodiment.In one embodiment, signal processing module, detection module and
Control module composition dose detection circuit.The quantity of dose measurement circuit is at least two.The quantity and detecting element of ionisation chamber
Quantity it is equal with the quantity of dose measurement circuit respectively.Each detecting element is located on the pole plate of corresponding ionisation chamber, and often
A detecting element is connected with corresponding dose measurement circuit.As shown in figure 5, in the present embodiment, detecting module 510 includes two electricity
From room and two detecting elements.The structure of ionisation chamber and detecting element is referred to the embodiment shown in Fig. 2.The quantity of ionisation chamber
It is respectively ionisation chamber 511 and ionisation chamber 512 for two.The quantity of detecting element is two, is respectively detecting element 511C and spy
Element 512C is surveyed, detecting element 511C is located on the electrode plate 511A of ionisation chamber 511, and detecting element 512C is located at ionisation chamber 512
Electrode plate 512A on.The quantity of dose measurement circuit is two.Two dose measurement circuits can be respectively by visiting accordingly
The dosage of module measurement ionising radiation is surveyed, to differentiate whether dosage detection circuit is normal.Under normal circumstances, two dose measurement electricity
The dosage that road detects should be equal or of substantially equal.If the measurement result gap of two dose measurement circuits it is larger or its
In the measurement result of a dose measurement circuit be mutated, then illustrate that the appearance of one of dose measurement circuit is abnormal.It is logical
It often can be determined that the preset dose value of ionising radiation differs a larger dose measurement circuit and exception occurs, can take at this time
Corresponding measure, such as alarm or end.In this way, the stability that can be run with incremental dose detecting system.
It should be noted that in theory, the area equation of two detecting elements, the ability of collection ionization electric charge is equal, because
This, the dose value that two dose measurement circuits are drawn by corresponding detecting element measurement respectively should be equal.It is but actual
On, the area of two detecting elements can have differences.Therefore, should be in two detection members between dose measurement system operation
Default proportionate relationship is set between part, their testing result is corrected to consistent, so that the ratio of their testing result
It is easier, directly perceived.
Fig. 6 is the schematic diagram of the observation circuit 600 of an embodiment.The observation circuit 600 is used for the output for detecting ionisation chamber
Electric signal.The observation circuit 600 includes signal processing module 610, detection module 620 and control module 630.Signal processing mould
Block 610 is connected with ionisation chamber, for amplifying electric signal, and exports amplified signal.Detection module 620 and signal processing module 610
Connection, detection module 620 are used to detect amplified signal, and output detection value.Control module 630 respectively with signal processing module
610 and detection module 620 connect, wherein, signal processing module 610 is adjustable to the gain amplifier of electric signal, and control module 630 is used
Signal processing module 610 is adjusted to gain amplifier corresponding with electric signal according to detected value and default detection threshold value.
Above-mentioned observation circuit 600, signal processing module 610 adjust the gain amplifier of electric signal, 630 energy of control module
It is enough to be adjusted signal processing module 610 to gain amplifier corresponding with electric signal according to detected value and default detection threshold value, with
Make signal processing module 610 that electric signal is amplified corresponding multiple.The amplified signal is detected by detection module 620, and exports detection
Value.The suitable gain of signal processing module 610 can make it that amplified signal is suitable, so that for ionisation chamber electric signal
Detected value is accurate.
Signal processing module 610 includes amplifier, and the multiple condenser networks being arranged in parallel, the output terminal of amplifier lead to
Cross multiple condenser networks and feed back to input terminal；Control module 630 whether controlling the connection of multiple condenser networks by adjusting amplification
The gain of device.
Each condenser network includes the relay and capacitance being connected in series, and control module 630 is by controlling relay to realize
Whether the connection of condenser network.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneously
Cannot therefore it be construed as limiting the scope of the patent.It should be pointed out that come for those of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. dose monitoring system of medical accelerator, it is characterised in that including：Detecting module, signal processing module, detection Module and control module；The detecting module is used for detecting ionizing radiation, and exports electric signal；The signal processing module and institute Detecting module connection is stated, for amplifying the electric signal, and exports amplified signal；The detection module and the signal processing mould Block connects, and the detection module is used to detect the amplified signal, and output detection value；The control module respectively with the letter Number processing module is connected with detection module, wherein, the signal processing module is adjustable to the gain amplifier of the electric signal, described Control module be used for according to the detected value and default detection threshold value by the signal processing module adjust to the telecommunications Number corresponding gain amplifier.
- 2. dose monitoring system according to claim 1, it is characterised in that the signal processing module includes amplifier, And the multiple condenser networks being arranged in parallel, the output terminal of the amplifier feed back to described put by the multiple condenser network The input terminal of big device；The control module whether connection that controls the multiple condenser network by adjusting the increasing of the amplifier Benefit.
- 3. the dose monitoring system stated according to claim 2, it is characterised in that each condenser network includes what is be connected in series Relay and capacitance, whether the control module realizes the connection of the condenser network by controlling the relay.
- 4. dose monitoring system according to claim 2, it is characterised in that the detecting module includes ionisation chamber and detection Element, the detecting element are arranged on a pole plate of the ionisation chamber；The detecting element is used to collect the ionisation chamber The ionization electric charge produced under the action of ionising radiation, and export electric signal；The input terminal of the signal processing module with it is described The output terminal connection of detecting element, the signal processing module is used to amplify the electric signal, and the electric signal is converted to Output of pulse signal.
- 5. dose monitoring system according to claim 4, it is characterised in that the detection module includes sampling unit, institute The input terminal for stating sampling unit is connected with the output terminal of the signal processing module, and the sampling unit is used to detect the pulse The crest voltage of signal is as detected value and exports to the control module.
- 6. dose monitoring system according to claim 5, it is characterised in that the sampling unit includes sampling hold circuit And comparator；The input terminal of the sampling hold circuit is connected with the output terminal of the signal processing module, and the sampling is kept Circuit is used for the peak value for detecting the pulse signal；The comparator includes first input end and the second input terminal；Described first Input terminal is connected with the output terminal of the signal processing module, the output terminal of second input terminal and the sampling hold circuit Connection；The comparator is sent signal is exported to the sampling hold circuit, to control the work of the sampling hold circuit State.
- 7. dose monitoring system according to claim 5, it is characterised in that the detection module further includes converting unit, The input terminal of the converting unit is connected with the output terminal of the sampling unit, and the converting unit is used for the pulse signal Peak value be converted to digital signal and export to the control module.
- 8. a kind of observation circuit, for detecting the electric signal of ionisation chamber output, it is characterised in that including signal processing module, inspection Survey module and control module；The signal processing module is connected with the ionisation chamber, for amplifying the electric signal, and is exported and is put Big signal；The detection module is connected with the signal processing module, and the detection module is used to detect the amplified signal, and Output detection value；The control module is connected with the signal processing module and detection module respectively, wherein, the signal processing Module is adjustable to the gain amplifier of the electric signal, and the control module is used for according to the detected value and default detection threshold value The signal processing module is adjusted to gain amplifier corresponding with the electric signal.
- 9. observation circuit according to claim 8, it is characterised in that the signal processing module includes amplifier, and The multiple condenser networks being arranged in parallel, the output terminal of the amplifier feed back to the input by the multiple condenser network End；The control module whether connection that controls the multiple condenser network by adjusting the gain of the amplifier.
- 10. observation circuit according to claim 9, it is characterised in that each condenser network includes what is be connected in series Relay and capacitance, whether the control module realizes the connection of the condenser network by controlling the relay.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| CN110727010A (en) * | 2019-09-25 | 2020-01-24 | 上海联影医疗科技有限公司 | Dose monitoring system and method for linear accelerator |
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