CN110274923B - Synchronous data acquisition and calibration method and control system of high-energy X-ray CT equipment - Google Patents
Synchronous data acquisition and calibration method and control system of high-energy X-ray CT equipment Download PDFInfo
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Abstract
The invention provides a synchronous data acquisition and calibration method of high-energy X-ray CT equipment, which comprises the following steps: s1, detecting an output pulse signal of a ray source of high-energy X-ray CT equipment; s2, when the pulse signal is detected, data acquisition of the pulse signal is executed to obtain pulse signal data; s3, after the step S2 is executed and before the next pulse signal from the ray source is detected, data acquisition of the environment is executed, and environment signal data are obtained; and S4, comparing the pulse signal data with the environment signal data to obtain data information of the object to be detected. The method simplifies the calibration and calibration process, shortens the total measurement time, can effectively reduce the influence caused by the background drift of the system detector, and has more obvious improvement effect particularly when measuring high-radiation samples. A corresponding control system for synchronized data acquisition and calibration is also presented.
Description
Technical Field
The present invention relates to the field of Computed Tomography (CT) apparatuses, and more particularly, to a method of data calibration of a high-energy X-ray CT apparatus and an associated control system.
Background
With the rapid development of national defense industry and civil industry technologies, workpieces to be detected are larger and larger in size, more and more complex in structure and higher in requirements on detection precision. In order to meet the detection requirements of large workpieces and complex environments, high-energy X-ray Computed Tomography (CT) technology is gradually gaining attention and developing and perfecting. The high-energy X-ray CT equipment usually adopts an accelerator device as a ray source, simultaneously comprises a turntable mechanical device, a detection system and other parts, can visually, clearly and accurately present the structure and density change of the inner part of the section of a large workpiece to be detected and the nature, position and size of defects, and plays an irreplaceable role in sensitive fields of aerospace, military industry and the like.
However, because the high-energy X-ray CT apparatus has a large volume, the stability of the radiation source, the runout and deflection of the rotary table, the relative pose relationship with the detector, the mechanical vibration, the complex background environment, and other factors all affect the overall system of the high-energy X-ray CT apparatus. Especially when the method is used for detecting and imaging radioactive workpieces, the influence of the radioactivity of the detected object on the measurement background cannot be avoided. The presence of these factors will eventually lead to a reduction in imaging quality and thus affect the detection effect. In order to solve the above problems, the high-energy X-ray CT apparatus usually needs to spend a lot of time to perform calibration and calibration work before it is shipped and used each time, so that it needs to compare the reconstructed image value with the actual value of the workpiece by scanning the workpiece with a specific material to determine the calibration parameters.
The prior art provides a related technical scheme for realizing matching and coupling of ray pulse, data acquisition and platform movement by a method for synchronizing a movement system and data acquisition, and also provides a related scheme for realizing strict synchronization of area array detector data acquisition, accelerator ray pulse emission and mechanical system movement by using a pulse technology, thereby improving the image quality. However, no related scheme for improving the detection accuracy by performing data acquisition and data calibration synchronously exists in the prior art.
Disclosure of Invention
Aiming at the problem of interference of various unstable factors in the high-energy X-ray tomography imaging calibration and use process in the prior art, particularly the problem of influence of high radioactivity of an object to be detected on a measurement result in imaging research under a high radiation environment, the invention provides a dynamic calibration and data acquisition method of a high-energy X-ray CT device, which can simplify the calibration and calibration process, shorten the total measurement time, effectively reduce the influence caused by background drift of a system detector, and particularly has more remarkable improvement effect on high radiation sample measurement.
According to an aspect of the present invention, there is provided a synchronous data acquisition and calibration method of a high-energy X-ray CT apparatus, the method including the steps of:
s1, detecting an output pulse signal of a ray source of high-energy X-ray CT equipment;
s2, when the pulse signal is detected, data acquisition of the pulse signal is executed to obtain pulse signal data;
s3, after the step S2 is executed and before the next pulse signal from the ray source is detected, data acquisition of the environment is executed, and environment signal data are obtained; and
and S4, comparing the pulse signal data with the environment signal data to obtain data information of the object to be detected.
According to the synchronous data acquisition and calibration method of the high-energy X-ray CT equipment, the imaging data are acquired when the pulse dose is output, the background data are acquired by utilizing the idle time of no pulse output of the accelerator, so that the measurement time is saved, the imaging data and the corresponding background data are in one-to-one correspondence to synthesize the data, and the authenticity and the accuracy of the measured data are ensured.
According to a preferred embodiment of the method for synchronous data acquisition and calibration of a high energy X-ray CT apparatus of the present invention, step S1 includes detecting a rising edge of the output pulse signal.
In another preferred embodiment of the method for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, a timer is started for timing at the same time as the detection of the rising edge of the output pulse signal.
According to still another preferred embodiment of the method for synchronized data acquisition and calibration of a high energy X-ray CT apparatus of the present invention, in step S2, the step of performing data acquisition of the pulse signal includes detecting a falling edge of the output pulse signal.
In a further preferred embodiment of the method for synchronous data acquisition and calibration of a high-energy X-ray CT apparatus according to the present invention, when a falling edge of the output pulse signal is detected, the timer is delayed for a first duration and then stopped, the beam dose value of the pulse signal is recorded, and a second duration of the timer is recorded.
According to a further preferred embodiment of the method for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, the acquisition of ambient signal data is performed after a timer has been delayed for a third period of time.
In another preferred embodiment of the method for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, the acquisition of ambient signal data is performed for a fourth time period equal to the second time period.
According to a further preferred embodiment of the method for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, after the acquisition of the ambient signal data has been performed, a corresponding mechanical control operation is performed on the high-energy X-ray CT apparatus.
An embodiment of the present invention also provides a control system for synchronous data acquisition and calibration of a high-energy X-ray CT apparatus, the control system including:
the pulse signal detection module is used for detecting an output pulse signal of a ray source of the high-energy X-ray CT equipment;
the data acquisition module is used for executing data acquisition of the pulse signals when the pulse signals are detected to obtain pulse signal data and executing data acquisition of the environment to obtain environment signal data;
the data processing module is used for obtaining data information of the object to be detected by comparing the pulse signal data with the environment signal data, and
and the control module is used for controlling the pulse signal detection module, the data acquisition module and the data processing module to cooperatively operate.
According to a preferred embodiment of the control system for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, the pulse signal detection module comprises a signal edge detection module for detecting edge variations of the pulse signal.
In another preferred embodiment of the control system for simultaneous data acquisition and calibration of a high energy X-ray CT apparatus according to the invention the data acquisition module comprises a high energy X-ray beam dose acquisition sub-module and a background data acquisition sub-module.
According to a further preferred embodiment of the control system for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, the control module comprises a timer for timing and recording the duration of the data acquisition.
In a further preferred embodiment of the control system for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus according to the invention, the control system further comprises a storage module for storing the signal data acquired by the data acquisition module and the timing duration of the timer.
Compared with the prior art, the method and the control system for synchronous data acquisition and calibration of the high-energy X-ray CT equipment can acquire and calibrate the real-time data of the CT scanning device according to the pulse characteristics of the signals generated by the ray source of the high-energy X-ray CT equipment, avoid the links of periodically performing manual later calibration and independent background data acquisition in the traditional calibration and data acquisition method of the CT scanning device, effectively improve the data acquisition efficiency, reduce noise interference, improve the image imaging effect, improve the reliability of the CT scanning device, save the time of scanning and imaging, have high practical application value, and are particularly suitable for the scanning and imaging research of radioactive samples.
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Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a flow chart of a method for simultaneous data acquisition and calibration of a high-energy X-ray CT apparatus according to the present invention; and
fig. 2 is a timing diagram of a synchronous data acquisition and calibration method of a high-energy X-ray CT apparatus according to the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The high-energy X-ray source of the high-energy X-ray CT apparatus is generally generated by an accelerator, and it outputs a pulse signal of several tens or hundreds of microseconds in width in one second due to a limitation of a system of the accelerator itself. By combining the characteristic of the accelerator, the invention provides a dynamic calibration and data acquisition method, which is used for acquiring imaging data when pulse dose is output and acquiring background data (local data refers to data in the environment where equipment is located) by using the idle time without pulse output of the accelerator, so that the measurement time is saved, the imaging data and the corresponding background data are in one-to-one correspondence to synthesize the data, and the authenticity and the accuracy of the measured data are ensured.
The invention has proposed the synchronous data acquisition and calibration method of a high-energy X-ray CT apparatus, as shown in fig. 1, the method of the invention includes the following steps, detect the output pulse signal of the ray source of the high-energy X-ray CT apparatus at first; then, when the pulse signal is detected, data acquisition of the pulse signal is executed to obtain pulse signal data; then, after the step of acquiring the pulse signal data is executed and before the next pulse signal from the ray source is detected, data acquisition of the environment is executed, and environment signal data is obtained; and finally, comparing the pulse signal data with the environment signal data to obtain the data information of the object to be detected.
Referring to fig. 2, the radiation source of the high-energy X-ray CT apparatus is generated by an accelerator, and the accelerator itself generates pulse energy output, so that the CT apparatus can be synchronously acquired and calibrated based on the output characteristics of the accelerator, thereby greatly saving the imaging and data output time of the CT apparatus and improving the utilization rate of the apparatus. That is, the data acquisition may be performed while the accelerator is outputting radiation, while the background data acquisition is performed between two pulse outputs of the accelerator, and calibration and other related operations of the CT apparatus are performed.
After the high-energy X-ray CT apparatus enters an operating state, an accelerator as a radiation source of the high-energy X-ray CT apparatus is first started, and X-rays from the accelerator are detected. That is, the data acquisition of the dose information of the X-ray source is performed while controlling the source pulse of the accelerator to emit a beam, and here, the output signal of the data acquisition operation may be started by detecting the rising edge of the source pulse to emit a beam, and the data acquisition operation of the dose information of the X-ray source may be started.
Further, a timer is started to time when the rising edge of the output pulse signal is detected, and the purpose of the time counting is to time the action time of data acquisition. After a timer is started, detecting a pulse falling edge of an X-ray source, delaying the timer when the falling edge of a pulse signal is detected, stopping timing after delaying a first time length, and recording a second time length from the rising edge of the pulse signal to the time when the timing is stopped, wherein the second time length is t0Wherein the second time period t0The beam pulse width t slightly larger than the pulse signal output by the accelerator4. At this time, the data acquisition action of the pulse signal can be stopped, and the beam dose value of the pulse signal can be recorded. Thus, the data acquisition work of the pulse signal of the high-energy X-ray CT apparatus is completed.
Then, measurement of background data can be performed between adjacent pulse signals of the high-energy X-ray CT apparatus. After the timer stops counting, the time delay is carried out, and the third time length t is delayed1And acquiring the environmental signal data.Here, the third time period t is delayed1The purpose of (1) is to avoid interference of induced radiation effects caused by high-energy X-rays. At this time, a signal acquisition module of the high-energy X-ray CT apparatus may be started to acquire data of the radiation signals in the surrounding environment, where the data acquisition time is a fourth time duration t2A fourth period of time t2May be equal to the second time period t for acquiring the pulse signal of the X-ray source0. After a fourth time period t2Thereafter, the environmental signal data of the detected surroundings is recorded.
After background data monitoring is complete and before the next accelerator pulse rising edge is detected, i.e., for a fifth time period t as shown in FIG. 23During which the mechanical system of the high-energy X-ray CT apparatus can be operated in relation thereto.
At the time of calibration, at a second time period t0The beam dose of the internally measured pulse signal is I0At the fourth time length t2The measured background data is I'0(ii) a During the imaging measurement scan, at a second time period t0The internally measured beam dose is Id0At the fourth time length t2The measured background data is I'd0From this, the directional attenuation coefficient at this time can be calculated as:
by analogy, the directional attenuation coefficient at any moment can be obtained, namely:
in addition, another aspect of the present invention further provides a control system for synchronous data acquisition and calibration of a high-energy X-ray CT apparatus, the control system includes a pulse signal detection module, a data acquisition module, a data processing module and a control module, wherein the pulse signal detection module is configured to detect an output pulse signal of a radiation source of the high-energy X-ray CT apparatus, the data acquisition module is configured to perform data acquisition of the pulse signal when the pulse signal is detected, obtain pulse signal data, and perform data acquisition of an environment, obtain environment signal data, the data processing module obtains data information of an object to be detected by comparing the pulse signal data with the environment signal data, and the control module is configured to control the pulse signal detection module, the data acquisition module and the data processing module to cooperatively operate.
The control system can acquire the pulse signal of the high-energy X-ray CT equipment and the background data at the same time, namely, the environmental data without the pulse signal, and the pulse signal data and the background data are compared through the data processing module, so that the related image data of the object to be detected is obtained. That is to say, the control system of the invention realizes the rapid and accurate detection and imaging of the object to be detected through the synchronous operation of data acquisition and data calibration, saves the scanning imaging time of the CT equipment, reduces the noise interference of the surrounding environment and improves the imaging effect of the image.
The pulse signal detection module of the control system includes a signal edge detection module, which is used to detect the edge change of the pulse signal, for example, the rising edge and/or the falling edge of the pulse signal can be detected, the rising edge is the time when the pulse signal is generated, and the falling edge is the time when the pulse signal is ended. The signal edge detection module is mainly used for ensuring the synchronization of data acquisition and the output of the pulse signal of the ray source.
The data acquisition module of the control system can comprise a high-energy X-ray beam dose acquisition sub-module and a background data acquisition sub-module, and can measure the pulse signal beam dose from the high-energy X-ray CT equipment through the high-energy X-ray beam dose acquisition sub-module and measure the background data in the operating environment through the background data acquisition sub-module.
The control module of the control system comprises a timer which is used for timing and recording the time length of data acquisition. As explained above in the method embodiments, the timer may time, record the detection time of the pulse signal, and be able to time or time the time of background detection. The timer is mainly used for ensuring that the pulse data acquisition time is consistent with the background data acquisition time, ensuring the time interval between the pulse data and the background data acquisition and avoiding mutual interference.
The control system for synchronous data acquisition and calibration of a high-energy X-ray CT apparatus according to the present invention may further include a storage module for storing the signal data acquired by the data acquisition module and the timing time of the timer. The storage module can store the dose data of the pulse signals and the time for acquiring the data, and is used for calling and processing in the subsequent steps.
In the working process of the control system, after the high-energy X-ray CT equipment is started, the signal edge detection module starts to detect the high-energy X-ray from the accelerator, when the edge change is detected, namely when the rising edge of the pulse signal is detected, information is immediately sent to the control module, and the control module immediately starts the timer. The signal edge detection module continuously detects the high-energy X-ray from the accelerator, and when the edge change is detected again, namely the falling edge of the pulse signal is detected, the data acquisition module stores the acquired dose value of the outgoing beam pulse signal to the storage module. And after the timer delays the first time, namely, after one time of timing is finished, the timer immediately stores the timing time to the storage module so as to be called by the control system, and the control system sends a coordination instruction to each module of the high-energy X-ray CT equipment, the accelerator system and the corresponding mechanical control system thereof according to the information from the signal edge detection module system, the control module and the storage module.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (13)
1. A method for simultaneous data acquisition and calibration of a high-energy X-ray CT apparatus, the method comprising the steps of:
s1, detecting an output pulse signal of a ray source of the high-energy X-ray CT equipment;
s2, when the pulse signal is detected, data acquisition of the pulse signal is executed, and pulse signal data are obtained;
s3, after the step S2 is executed and before the next pulse signal from the ray source is detected, data acquisition of the environment is executed, and environment signal data are obtained; and
s4, comparing the pulse signal data with the environment signal data to obtain data information of the object to be detected;
the method further comprises the following steps: and ensuring the time interval between the data acquisition of the pulse signal and the data acquisition of the environment by using a timer, wherein the time interval is set to avoid the interference of the induced radiation effect caused by the high-energy X-ray.
2. The method for synchronous data acquisition and calibration of a high energy X-ray CT apparatus according to claim 1, wherein said step S1 includes detecting a rising edge of said output pulse signal.
3. The method of claim 2, wherein a timer is started to count the time when a rising edge of the output pulse signal is detected.
4. The synchronous data acquisition and calibration method of a high-energy X-ray CT apparatus according to claim 1, wherein in said step S2, the step of performing data acquisition of said pulse signal includes detecting a falling edge of said output pulse signal.
5. The method according to claim 4, wherein the timer is delayed for a first period of time and then stopped when the falling edge of the output pulse signal is detected, the beam dose value of the pulse signal is recorded, and a second period of time of the timer is recorded.
6. The method of claim 5, wherein the acquiring of the environmental signal data is performed after delaying the timer for a third period of time.
7. The method of claim 6, wherein a fourth time period for performing the acquisition of the ambient signal data is equal to the second time period.
8. The method of claim 6, wherein a corresponding mechanical control operation is performed on the high energy X-ray CT apparatus after the acquisition of the environmental signal data is performed.
9. A control system for synchronized data acquisition and calibration of a high-energy X-ray CT apparatus, the control system comprising:
the pulse signal detection module is used for detecting an output pulse signal of a ray source of the high-energy X-ray CT equipment;
the data acquisition module is used for executing data acquisition of the pulse signals when the pulse signals are detected to obtain pulse signal data and executing data acquisition of the environment to obtain environment signal data;
the data processing module is used for obtaining data information of the object to be detected by comparing the pulse signal data with the environment signal data, and
the control module is used for controlling the pulse signal detection module, the data acquisition module and the data processing module to cooperatively operate;
wherein the data acquisition module is arranged to: obtaining the environmental signal data after obtaining the pulse signal data and before the pulse signal detection module detects a next pulse signal from the radiation source;
the control module comprises a timer for ensuring a time interval between data acquisition of the pulse signal and data acquisition of the environment, the time interval being set to avoid interference of induced emission effects caused by high-energy X-rays.
10. The control system for synchronized data acquisition and calibration of a high energy X-ray CT apparatus according to claim 9, wherein said pulse signal detection module comprises a signal edge detection module for detecting edge variations of said pulse signal.
11. The control system for synchronized data acquisition and calibration of a high energy X-ray CT apparatus of claim 9, wherein the data acquisition module comprises a high energy X-ray beam dose acquisition sub-module and a background data acquisition sub-module.
12. The control system for synchronized data acquisition and calibration of a high energy X-ray CT apparatus according to claim 9, wherein said timer is used to time and record the duration of data acquisition.
13. The control system for synchronized data acquisition and calibration of a high energy X-ray CT apparatus according to claim 12, further comprising a storage module for storing the signal data acquired by said data acquisition module and the timing duration of said timer.
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