CN110274923A - The synchronous data collection of sigmatron CT equipment and calibration method and control system - Google Patents
The synchronous data collection of sigmatron CT equipment and calibration method and control system Download PDFInfo
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Abstract
The present invention provides a kind of synchronous data collection of sigmatron CT equipment and calibration methods, and this method comprises the following steps: S1. detects the output pulse signal of the radiographic source of sigmatron CT equipment；S2. the data acquisition that pulse signal is executed when detecting pulse signal, obtains pulse data signal；S3. it after executing the step S2 and before detecting the next pulse signal from radiographic source, executes and the data of environment is acquired, obtain ambient-signal data；And S4. obtains the data information of object to be detected by comparing to pulse data signal and ambient-signal data.This process simplify calibration calibration processes, shorten measurement total time, while can be effectively reduced the influence of system detector background drift bring, and when especially measuring high radiation sample, improvement is more significant.It also proposed the control system of corresponding synchronous data collection and calibration.
Description
Technical field
The present invention relates to computer tomography (CT) apparatus fields, more particularly, to a kind of sigmatron CT equipment
Data calibration method and related Control System.
Background technique
With the fast development of national defense industry and civilian industry technology, the size of the workpiece detected is increasingly
Greatly and structure becomes increasingly complex, and the requirement to detection accuracy is also higher and higher.In order to meet the inspection under big workpiece and complex environment
Survey and require, sigmatron computer tomography (CT) technology gradually paid attention to and paid close attention to, and be constantly developed with it is complete
It is kind.Sigmatron CT equipment generallys use accelerator installation as radiographic source, while including turntable mechanical device and detection system
Equal components, can property intuitive, clear and that the structure being tested inside the section of big workpiece, variable density and defect is accurately presented
Matter, position and size play the effect that can not be substituted in Sensitive Domains such as space flight and aviation, military projects.
However, since sigmatron CT equipment volume is larger, the stability of radiographic source, the bounce of turntable and beat, with
The factors such as the background environment of the relative pose relationship of detector, mechanical oscillation and complexity can be to sigmatron CT equipment
Total system impacts.Especially when for carrying out detection imaging to radioactivity workpiece, the radiation of detected object itself
Property to measurement background influence be unavoidable.The presence of these factors finally will lead to the decline of image quality, and thus
Influence detection effect.To solve the above-mentioned problems, sigmatron CT equipment needs usually when leaving the factory and before each use
It takes a significant amount of time and carries out calibration and calibration, the workpiece by scanning certain material is thus needed, by reconstruction image number
Value and workpiece true value are compared, to determine calibrating parameters.
It is proposed in the prior art by making the method for kinematic system and data collection synchronous and realizes ray pulse, data
The related art scheme for matching with coupling of acquisition and platform movement, it is also proposed that realize planar array detector number using pulse technique
According to the stringent synchronization of acquisition, accelerator ray pulse transmitting and mechanical system motion three, the correlation of picture quality is thus improved
Scheme.But do not occurred in the prior art quasi- to improve detection in such a way that data acquire execute synchronous with data scaling
The relevant programme of exactness.
Summary of the invention
For the various unstable factors in sigmatron tomographic imaging existing in the prior art calibration and use process
Interference problem, the high radioactivity of object to be detected influences measurement result in the imaging research under especially high radiation environment
Problem, the present invention propose dynamic calibration and the collecting method of a kind of sigmatron CT equipment, can simplify calibration calibration
Process shortens measurement total time, while can be effectively reduced the influence of system detector background drift bring, especially to high spoke
When penetrating sample measurement, the improvement of the program is more significant.
According to an aspect of the present invention, synchronous data collection and the calibration method of a kind of sigmatron CT equipment are provided,
This method comprises the following steps:
S1. the output pulse signal of the radiographic source of sigmatron CT equipment is detected；
S2. the data acquisition that pulse signal is executed when detecting pulse signal, obtains pulse data signal；
S3. it after executing the step S2 and before detecting the next pulse signal from radiographic source, executes
Data acquisition to environment, obtains ambient-signal data；And
S4. by comparing to pulse data signal and ambient-signal data, the data information of object to be detected is obtained.
The synchronous data collection of sigmatron CT equipment according to the present invention and calibration method are when there is pulsed dosage output
The acquisition for carrying out imaging data is carried out the acquisition of background data using the free time of accelerator no pulse output, so both saved
Time of measuring has been saved, and imaging data is corresponded with corresponding background data, to carry out the synthesis of data, ensure that survey
Measure the authenticity and accuracy of data.
The synchronous data collection of sigmatron CT equipment according to the present invention and a preferred implementation of calibration method
Example, step S1 include the rising edge for detecting output pulse signal.
In the synchronous data collection of sigmatron CT equipment according to the present invention and another preferred reality of calibration method
It applies in example, starts timer while the rising edge for detecting output pulse signal and carry out timing.
Another of the synchronous data collection of sigmatron CT equipment according to the present invention and calibration method are preferably implemented
Example, in step s 2, execute pulse signal data acquisition the step of include being detected to the failing edge of output pulse signal.
In the synchronous data collection of sigmatron CT equipment according to the present invention and an also preferred reality for calibration method
It applies in example, in the failing edge for detecting output pulse signal, stops timing, recording impulse after making timer the first duration of delay
The line dose value of signal, and record the second duration of timer.
Another of the synchronous data collection of sigmatron CT equipment according to the present invention and calibration method are preferably implemented
Example makes timer be delayed after third duration, the acquisition of performing environment signal data.
In the synchronous data collection of sigmatron CT equipment according to the present invention and another preferred reality of calibration method
It applies in example, the 4th duration of the acquisition of performing environment signal data is equal to the second duration.
Another of the synchronous data collection of sigmatron CT equipment according to the present invention and calibration method are preferably implemented
Example executes corresponding Mechanical course to sigmatron CT equipment and operates after having executed the acquisition of ambient-signal data.
The embodiment of the present invention also provides a kind of control of synchronous data collection and calibration for sigmatron CT equipment
System, the control system include:
Pulse signal detection module, the pulse signal detection module are used for the ray to the sigmatron CT equipment
The output pulse signal in source is detected；
Data acquisition module, the data acquisition module is for executing the pulse letter when detecting the pulse signal
Number data acquisition, obtain pulse data signal, and execute and acquire to the data of environment, obtain ambient-signal data；
Data processing module, the data processing module pass through to the pulse data signal and the ambient-signal data
It compares, obtains the data information of object to be detected, and
Control module, the control module for control the pulse signal detection module, the data acquisition module and
The data processing module cooperating.
One of the control system of synchronous data collection and calibration according to the present invention for sigmatron CT equipment is excellent
The embodiment of choosing, pulse signal detection module include signal edge detection module, and the edge for detecting pulse signal changes.
Synchronous data collection and the calibration according to the present invention for sigmatron CT equipment control system it is another
In a preferred embodiment, data acquisition module includes sigmatron line dosage acquisition submodule and background data acquisition
Module.
Another of the control system of synchronous data collection and calibration according to the present invention for sigmatron CT equipment
Preferred embodiment, control module include timer, and the duration that timer is used to acquire data carries out timing and record.
Synchronous data collection and the calibration according to the present invention for sigmatron CT equipment control system it is another
In a preferred embodiment, control system further includes memory module, and memory module is for storing by data collecting module collected
The timing duration of signal data and timer.
Compared with prior art, the method for synchronous data collection and the calibration of sigmatron CT equipment according to the present invention
With control system be capable of the pulse characteristic of the signal according to caused by the radiographic source of sigmatron CT equipment to CT scanning device into
Row real-time data acquisition and calibration calibration, eliminate and need in the calibration calibration and collecting method of traditional CT scanning device
The link for periodically carrying out artificial later period calibration calibration and the acquisition of individual background data, can effectively improve data acquisition efficiency,
Noise jamming is reduced, improves image imaging effect, improves the reliability of CT scanning device, saved the time of scanning imagery, is had
There is very high practical application value, is particularly suitable for the scanning imagery research of radioactive sample.
Detailed description of the invention
By the description made for the present invention of below with reference to attached drawing, other objects and advantages of the present invention will be aobvious and easy
See, and can help that complete understanding of the invention will be obtained.
Fig. 1 is the flow chart of the synchronous data collection and calibration method of sigmatron CT equipment according to the present invention；And
Fig. 2 is the synchronous data collection of sigmatron CT equipment according to the present invention and the timing diagram of calibration method.
It should be noted that attached drawing is not necessarily to scale to draw, but only not influence the schematic of reader's understanding
Mode is shown.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the attached drawing of the embodiment of the present invention,
Technical solution of the present invention is clearly and completely described.Obviously, described embodiment is an implementation of the invention
Example, instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art are without creating
Property labour under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless otherwise defined, the technical term or scientific term that the present invention uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood.
The sigmatron source of sigmatron CT equipment is usually generated by accelerator, due to the limit of accelerator own system
System, it is the delicate pulse signal of number that tens or several hundred a width are exported usually in one second.In conjunction with this feature of accelerator,
The present invention proposes a kind of calibration of dynamic calibration and collecting method, and adopting for imaging data is carried out when there is pulsed dosage output
Collection, carrying out background data using the free time of accelerator no pulse output, (local data here refers to equipment local environment
In data) acquisition, so not only save time of measuring, but also imaging data is corresponded with corresponding background data,
To carry out the synthesis of data, the authenticity and accuracy of measurement data ensure that.
The invention proposes a kind of synchronous data collection of sigmatron CT equipment and calibration methods, as shown in Figure 1, this
The method of invention includes the following steps, detects first to the output pulse signal of the radiographic source of sigmatron CT equipment；It connects
, the data acquisition of pulse signal is executed when detecting pulse signal, obtains pulse data signal；Then, it obtains having executed
After the step of taking pulse data signal and before detecting the next pulse signal from radiographic source, execute to environment
Data acquisition, obtain ambient-signal data；Finally, being obtained by being compared to pulse data signal and ambient-signal data
Obtain the data information of object to be detected.
Referring to shown in Fig. 2, the radiographic source of sigmatron CT equipment is generated by accelerator, and accelerator itself generates pulsed
Energy output, therefore can this output characteristics based on accelerator to CT equipment carry out data synchronous acquisition and calibration, by
This greatlys save the imaging of CT equipment and data output time, improves the utilization rate of equipment.That is, can be defeated in accelerator
Data collection task is carried out when emergent ray, and carries out the acquisition of background data between the output of two subpulses of accelerator, and hold
Row calibration and other relevant operations to CT equipment.
After sigmatron CT equipment enters working condition, start the radiographic source as sigmatron CT equipment first
Accelerator, and the X-ray from accelerator is detected.That is, the radiographic source pulse in control accelerator goes out beam
While data acquisition is carried out to the dosage information of x-ray source, here, the rising edge of beam can be gone out by detecting radiographic source pulse
Carry out the output signal of log-on data acquisition movement, and starts the data acquisition operations of the dosage information of x-ray source.
Further, start timer while the rising edge for detecting output pulse signal and carry out timing, timing
Purpose is to carry out timing to the actuation time of data acquisition.After starting timer, the pulse falling edge of x-ray source is examined
It surveys, when detecting the failing edge of pulse signal, timer is made to be delayed, stop timing after first duration that is delayed, and record
The rising edge of pulse signal to the second duration when stopping timing, this second when a length of t0, wherein the second duration t0Slightly larger than adding
The line pulsewidth t of the pulse signal of fast device output4.It can be acted at this time with the data acquisition of stop pulse signal, recording impulse letter
Number line dose value.In this way, just completing the data collection task of the pulse signal of sigmatron CT equipment.
Then, the measurement of background data can be carried out between the adjacent pulse signal of sigmatron CT equipment.It is counting
When device stop carrying out time delay after timing, postpone third duration t1, the acquisition of performing environment signal data.Here, delay
Third duration t1Purpose be the interference of radiation effect of inducting caused by avoiding sigmatron.It is penetrated at this point it is possible to start high energy X
The signal acquisition module of line CT equipment, to carry out data acquisition, data acquisition in this to the ray signal in ambient enviroment
Time is the 4th duration t2, the 4th duration t2The second duration t being acquired to the pulse signal of x-ray source can be equal to0.Through
Cross the 4th duration t2Later, the ambient-signal data of ambient enviroment detected is recorded.
After being completed to background data monitoring, and before detecting next accelerator pulse rising edge, that is, exist
5th duration t shown in Fig. 23Period can carry out relevant operation to the mechanical system of sigmatron CT equipment.
When being demarcated, in the second duration t0The line dosage of the pulse signal inside measured is I0, in the 4th duration t2It is interior
The background data measured is I '0；When carrying out imaging measurement scanning, in the second duration t0The line dosage inside measured is Id0,
4th duration t2The background data inside measured is I 'd0, it is possible thereby to calculate the direction attenuation coefficient at this moment are as follows:
And so on, the direction attenuation coefficient of available any moment, i.e., are as follows:
In addition, another aspect of the present invention also proposed a kind of synchronous data collection for sigmatron CT equipment and
The control system of calibration, the control system include pulse signal detection module, data acquisition module, data processing module and control
Molding block, wherein pulse signal detection module is used to examine the output pulse signal of the radiographic source of sigmatron CT equipment
It surveys, data acquisition module is acquired for executing the data of pulse signal when detecting pulse signal, pulse data signal is obtained,
And execute and the data of environment are acquired, ambient-signal data is obtained, data processing module passes through to pulse data signal and ring
Border signal data compares, and obtains the data information of object to be detected, control module for control wave detection module,
Data acquisition module and data processing module cooperating.
By control system according to the present invention data acquisition can be carried out in the pulse signal to sigmatron CT equipment
While, background data is acquired, that is, environmental data when to no pulse signal is acquired, at data
Reason module compares pulse data signal and background data, thus obtains the dependent image data for needing the object detected.
That is, control system of the invention realizes by data acquisition and the simultaneously operating of data calibration and treats test object
It fast and accurately detects and is imaged, save the scanning imaging time of CT equipment, and the noise for reducing ambient enviroment is dry
It disturbs, improves the imaging effect of image.
The pulse signal detection module of the control system includes signal edge detection module, for detecting the pulse signal
Edge variation, for example can detecte the rising edge and/or failing edge of pulse signal, rising edge be pulse signal generate when
It carves, at the time of failing edge is pulse signal ends.Signal edge detection module is used primarily to ensure data acquisition and radiographic source
The synchronization of output of pulse signal.
The data acquisition module of control system according to the present invention may include sigmatron line dosage acquisition submodule
Submodule is acquired with background data, submodule can be acquired to from sigmatron CT by sigmatron line dosage respectively
The pulse signal line dosage of equipment measures, by background data acquire submodule to the background data in operating environment into
Row measurement.
The control module of the control system includes timer, the duration which is used to acquire data carry out timing with
Record.As above illustrated in embodiment of the method, timer can carry out timing, record to the detection time of pulse signal,
And timing or timing can be carried out to the time that background detects.Timer mainly serves for ensuring pulse data acquisition time and background
Data acquisition time is consistent, while guaranteeing the time interval between pulse data and background data acquisition, avoids interfering with each other.
It can also be wrapped according to the control system for weighing synchronous data collection and the calibration for sigmatron CT equipment of the invention
Memory module is included, memory module is used to store the timing time of signal data and timer by data collecting module collected.
Memory module can store the dose data of pulse signal, and the time that can also be acquired to data stores, and be used for
It is called and handles in the next steps.
In the course of work of control system according to the present invention, after opening sigmatron CT equipment, signal edge
Detection module starts to detect the sigmatron from accelerator, when detecting edge variation, that is, is detecting pulse
When the rising edge of signal, information is issued to control module immediately, control module then starts timer immediately.Signal edge detection mould
Block persistently detects the sigmatron from accelerator, when detecting edge variation again, that is, detects pulse signal
Failing edge when, data acquisition module by it is collected go out beam pulse signal dose value store to memory module.Timer is then
After the first time that is delayed, that is, after completing a timing, timing time is stored to memory module immediately, so as to by control system
It calls, control system is penetrated according to the information from signal edge detection modular system, control module and memory module, Xiang GaonengX
The modules and accelerator system of line CT equipment and its corresponding Machinery Control System, which issue, coordinates instruction.
For the embodiment of the present invention, it is also necessary to explanation, in the absence of conflict, the embodiment of the present invention and reality
Applying the feature in example can be combined with each other to obtain new embodiment.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is of the invention
Protection scope should be subject to the protection scope in claims.
Claims (13)
1. synchronous data collection and the calibration method of a kind of sigmatron CT equipment, which is characterized in that the method includes as follows
Step:
S1. the output pulse signal of the radiographic source of the sigmatron CT equipment is detected；
S2. the data acquisition that the pulse signal is executed when detecting the pulse signal, obtains pulse data signal；
S3. after having executed the step S2 and before detecting the next pulse signal from the radiographic source,
It executes and the data of environment is acquired, obtain ambient-signal data；And
S4. by comparing to the pulse data signal and the ambient-signal data, the data of object to be detected are obtained
Information.
2. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 1, which is characterized in that
The step S1 includes the rising edge for detecting the output pulse signal.
3. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 2, which is characterized in that
Start timer while detecting the rising edge of the output pulse signal and carries out timing.
4. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 1, which is characterized in that
In the step S2, the step of executing the data acquisition of the pulse signal includes failing edge to the output pulse signal
It is detected.
5. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 4, which is characterized in that
When detecting the failing edge of the output pulse signal, stops timing after making the first duration of the timer delay, record institute
The line dose value of pulse signal is stated, and records the second duration of the timer.
6. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 5, which is characterized in that
After making the timer delay third duration, the acquisition of performing environment signal data.
7. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 6, which is characterized in that
The 4th duration for executing the acquisition of the ambient-signal data is equal to second duration.
8. synchronous data collection and the calibration method of sigmatron CT equipment according to claim 6, which is characterized in that
After the acquisition for having executed the ambient-signal data, corresponding Mechanical course is executed to the sigmatron CT equipment and is grasped
Make.
9. a kind of control system of synchronous data collection and calibration for sigmatron CT equipment, which is characterized in that the control
System processed includes:
Pulse signal detection module, the pulse signal detection module are used for the radiographic source of the sigmatron CT equipment
Output pulse signal is detected；
Data acquisition module, the data acquisition module is for executing the pulse signal when detecting the pulse signal
Data acquisition obtains pulse data signal, and executes and acquire to the data of environment, obtains ambient-signal data；
Data processing module, the data processing module pass through to the pulse data signal and ambient-signal data progress
Comparison, obtains the data information of object to be detected, and
Control module, the control module is for controlling the pulse signal detection module, the data acquisition module and described
Data processing module cooperating.
10. the control system of synchronous data collection and the calibration according to claim 9 for sigmatron CT equipment,
It is characterized in that, the pulse signal detection module includes signal edge detection module, for detecting the side of the pulse signal
Along variation.
11. the control system of synchronous data collection and the calibration according to claim 9 for sigmatron CT equipment,
It is characterized in that, the data acquisition module includes sigmatron line dosage acquisition submodule and background data acquisition submodule
Block.
12. the control system of synchronous data collection and the calibration according to claim 9 for sigmatron CT equipment,
It is characterized in that, the control module includes timer, the duration that the timer is used to acquire data carries out timing and note
Record.
13. the control system of synchronous data collection and the calibration according to claim 12 for sigmatron CT equipment,
It is characterized in that, the control system further includes memory module, the memory module is for storing by the data acquisition module
The timing duration of the signal data of acquisition and the timer.
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