CN102023306A - Accelerator dosage monitoring device, correction method and method for monitoring offset of accelerator target spot P - Google Patents
Accelerator dosage monitoring device, correction method and method for monitoring offset of accelerator target spot P Download PDFInfo
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Abstract
The invention discloses an accelerator X-ray dosage monitoring device in an X-ray radiation imaging system. The X-ray radiation imaging system comprises an accelerator X-ray source, a collimator for collimating X rays and a detection probe. The X-ray dosage monitoring device comprises an X-ray dosage monitoring probe, wherein X-ray dosage measured by the detection probe is corrected according to the X-ray radiation dosage monitored by the X-ray dosage monitoring probe. The X-ray dosage monitoring probe is arranged on at lease one side of a collimating slit of the collimator and is used for monitoring the dosage of the X rays radiated from an accelerator; and by changing the positions of dosage monitoring points, the dosage monitoring probe is arranged on the collimator, the monitoring probe is close to an accelerator target spot and the dosage rate of the accelerator received by the monitoring probe is high, so that data has high statistic properties. Simultaneously normal beams are not blocked, so the statistic properties of probe data of the detection probe are not reduced.
Description
Technical field
The present invention relates to accelerator X ray container radiation imaging inspection field.Specifically, the present invention relates to the accelerator x-ray dose monitoring device in a kind of X-radiation imaging system and have an X-radiation imaging system of above-mentioned accelerator x-ray dose monitoring device.In addition, the invention still further relates to a kind of method that accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct.In addition, the invention still further relates to a kind of method of monitoring the accelerator target spot P skew in the X-radiation imaging system.
Background technology
The accelerator x-ray source is a topmost radiographic source in the container radiation imaging inspection field.The X ray that accelerator produces, its ray average energy height, output dose reaches radiation protection safety flexibly, but its output dose is not very stable, monitoring in real time and correction, and the error of dose monitoring generation simultaneously also will directly influence picture quality and imaging index.
Particularly, the accelerator x-ray source is by microwave accelerating tube or current in electrostatic accelerating tube etc. electronics to be accelerated to very high-energy, when the electron bombard target, because the bremsstrahlung of electronics in target material is being that a large amount of cone type X-ray bundles appear in rotational symmetry with the electron motion direction.X-ray dose is relevant with electron energy (accelerator energy) with energy angular distribution, the electron energy angle of elevation preshoot more that distributes more, therefore the dose distribution of each accelerator pulse in the space is uneven, and the dose data that detector obtains need carry out the geometry consistance and proofread and correct.Similarly, have multiple influence factor and statistical deviation, the dosage of each pulse output of accelerator is also non-constant, need monitor in real time and proofread and correct.Its dosage will be attenuated when X ray sees through object to be detected, and the relative attenuation of dosage is relevant with the equivalent mass thickness of object to be detected.It is the damping capacity of the relative dosage of pixel that recording ray sees through at every, promptly forms the transmitted radiation image of an amplitude object.
What the most frequently used accelerator X ray container check system adopted is fan-shaped x-ray beam, promptly by collimating slit original cone beam collimated is become fladellum, with the spatial dose distribution of one-dimensional array detector record one dimension; At another dimension space, carry out time-space conversion, for example go out bundle or mobile object according to the order of sequence according to the order of sequence.Because the original doses difference of space, time every bit, for the quality and the comparability of image, dosage should be proofreaied and correct and be proofreaied and correct in the room and time dimension.
Current time dimension dose monitoring mode commonly used has: 1, adopt the detector group data far depart from X ray main beam place, wherein this group detector can not be detected thing and blocks; 2, go out the bundle place at the accelerator X ray and adorn a penetrating lonization chamber, make whole beam line dosage splitter section dosage give ionization chamber.But these two kinds of data statisticss that method measures promptly are usually used in the data statistics that the regionally detecting of index test arrives with respect to the main beam place, do not have too many superiority; Because it is a lot of that the relative central beam of the dosage place dosage at place, angle far away descends, high energy acclerator especially, this kind situation is particularly evident; And penetrating lonization chamber is done very thickly, though can improve the statistical of monitoring dose data to a certain extent, has also influenced the effective output dose and the statistical thereof of accelerator.The statistical of monitoring dose data will pass to the latter when the correcting detection dose data, influence picture quality.
Therefore, need provide a kind of can the dose monitoring apparatus and method of improved accelerator roentgen dose X on time dimension, reduce monitoring agent quantitative statistics error, thereby improve the picture quality and the index of radiation image-forming system.
Summary of the invention
Purpose of the present invention is intended to solve at least one aspect of the above-mentioned problems in the prior art and defective.
Correspondingly, one of purpose of the present invention is to provide the accelerator x-ray dose monitoring device in a kind of improved X-radiation imaging system, and it can reduce the statistical error of accelerator roentgen dose X dose monitoring on time dimension.
Another object of the present invention is to provide a kind of X-radiation imaging system with improved accelerator x-ray dose monitoring device, it can reduce the statistical error of accelerator roentgen dose X dose monitoring on time dimension, thereby improves the image index of radiation image-forming system.
A further object of the present invention is to provide a kind of method that accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct, thereby reduce the statistical error of accelerator roentgen dose X dose monitoring on time dimension, and then improve the image index of the X-radiation imaging system that adopts above-mentioned accelerator.
Another object of the present invention is to provide a kind of method of monitoring the accelerator target spot P skew in the X-radiation imaging system, its dosage by monitoring accelerator changes, and monitors the skew of target spot P in real time.
According to an aspect of the present invention, it provides the monitoring device of the accelerator x-ray dose in a kind of X-radiation imaging system, and wherein said X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; With the detection detector that the x-ray dose that penetrates after the object to be detected is surveyed, described accelerator x-ray dose monitoring device comprises: the x-ray dose monitoring detector, wherein the x-ray dose that detects detector measurement is proofreaied and correct based on the X-radiation dosage of described x-ray dose monitoring detector monitoring, it is characterized in that: described x-ray dose monitoring detector is arranged at least one side of collimating slit of described collimating apparatus, is used to monitor the dosage of the X ray that goes out from radiation from machine.
According to above-mentioned aspect of the present invention, it is by changing the position of dose monitoring point, the monitoring dose detector is arranged on the collimating apparatus of fladellum, this monitoring detector is very near from accelerator target spot P, the accelerator dosage of its acceptance is very high, thereby guarantee that data have very high statistical, do not stop normal line again simultaneously, thereby can not reduce the statistical of the detection data that detects detector.
According to a further aspect in the invention, it provides a kind of X-radiation imaging system, comprising: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; To penetrating the detection detector that object to be detected x-ray dose is afterwards surveyed; And be used for accelerator x-ray dose monitoring detector that the x-ray dose that radiation from machine goes out is monitored, wherein based on the X-radiation dosage of described x-ray dose monitoring detector monitoring the x-ray dose that detects detector measurement is proofreaied and correct, be it is characterized in that: described x-ray dose monitoring detector is arranged at least one side of collimating slit of described collimating apparatus.
In technique scheme of the present invention, it has improved the statistical of accelerator dose monitoring measurement data, and then based on the X-radiation dosage of described x-ray dose monitoring detector monitoring the x-ray dose that detects detector measurement is proofreaied and correct, improve thereby help system's image index.In addition, it avoids simultaneously stopping that reasonable beam stream passes through, and further helps system's image index and improves the especially improvement of indexs such as silk, spatial discrimination in the air.
Preferably, described x-ray dose monitoring detector comprises first, second monitoring detector portion, and described first, second monitoring detector portion is arranged on respectively on the both sides of collimating slit of described collimating apparatus.
In one embodiment, described x-ray dose monitoring detector is made up of at least one detector module.
Preferably, described x-ray dose monitoring detector is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
In technique scheme, each in described first, second monitoring detector portion is made up of at least one detector module.
Further, each in described first, second monitoring detector portion is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
In accordance with a further aspect of the present invention, it provides a kind of method that accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct, and wherein the X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; And to penetrating the detection detector that object to be detected x-ray dose is afterwards surveyed, described method comprises step: the x-ray dose monitoring detector that will be used for that the x-ray dose that radiation from machine goes out is monitored is arranged at least one side of the collimating slit of described collimating apparatus; Drive accelerator x-ray source radiation X ray, and obtain the x-ray dose that the radiation from machine of accelerator x-ray dose monitoring device monitoring goes out; And the x-ray dose that detects detector measurement is proofreaied and correct based on the X-radiation dosage of described x-ray dose monitoring detector monitoring.
In one embodiment, described x-ray dose monitoring detector is made up of a plurality of detector modules, described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit, and the step that wherein obtains the x-ray dose that the radiation from machine of accelerator x-ray dose monitoring device monitoring goes out also comprises: the summation of the radiation dose of measuring according to each detector module is with the step of the x-ray dose that obtains radiation from machine and go out.
According to also one side of the present invention, it provides a kind of method of monitoring the accelerator target spot P skew in the X-radiation imaging system, and wherein the X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; And to penetrating the detection detector that object to be detected x-ray dose is afterwards surveyed, comprise step: first, second x-ray dose monitoring detector that will be used for the x-ray dose that radiation from machine goes out is monitored is separately positioned on the both sides of the collimating slit of described collimating apparatus; Drive accelerator x-ray source radiation X ray, and obtain first, second x-ray dose that the radiation from machine of first, second x-ray dose monitoring detector monitoring goes out; Based on the difference of described first, second x-ray dose, obtain relative deviation value about accelerator target spot P skew; And, determine that accelerator target spot P produces skew when described relative deviation value during greater than predetermined threshold value.
Particularly, first, second x-ray dose monitoring detector is arranged on substantially symmetrically with respect to described collimating slit on the both sides of collimating slit of described collimating apparatus; And described relative deviation value Y is determined by following formula: Y=| (A-B)/(A+B) |, wherein A, B represent first, second x-ray dose that first, second x-ray dose monitoring detector monitors respectively.
Further, said method also comprises: when determining that relative deviation value that accelerator target spot P produces is greater than predetermined threshold value, and the step that gives the alarm.
By technique scheme, compare with prior art, the present invention has improved the statistical of accelerator dose monitoring measurement data; In addition, owing to avoid stopping that reasonable beam stream passes through, help system's image index and improve for example improvement of indexs such as silk, spatial discrimination in the air.In addition, can monitor the variation of target spot P move left and right in real time, thereby further the duty of accelerator be monitored and fed back.Simplicity of design of the present invention, characteristics such as wide accommodation need not joined complex apparatus, and operating cost is low are applicable to all fladellum accelerator X ray container radiation imaging check systems.
Description of drawings
Fig. 1 is according to accelerator x-ray dose monitoring device in the X-radiation imaging system of the specific embodiment of the present invention and the synoptic diagram with X-radiation imaging system of above-mentioned accelerator x-ray dose monitoring device.
Fig. 2 shows the side view that is provided with the collimating apparatus that detects detector set.
Fig. 3 is the front elevation of the collimating apparatus of two x-ray dose monitoring detectors about demonstration is provided with.
Fig. 4 is the process flow diagram that shows the method for proofreading and correct according to the accelerator x-ray dose in the X-radiation imaging system of the specific embodiment of the present invention.
Fig. 5 is the process flow diagram that shows according to the method for the skew of the accelerator target spot P in the monitoring X-radiation imaging system of the specific embodiment of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.In instructions, same or analogous drawing reference numeral is indicated same or analogous parts.Following explanation to embodiment of the present invention is intended to present general inventive concept of the present invention is made an explanation with reference to accompanying drawing, and not should be understood to a kind of restriction of the present invention.
Fig. 1 is according to accelerator x-ray dose monitoring device in the X-radiation imaging system of the specific embodiment of the present invention and the synoptic diagram with X-radiation imaging system of above-mentioned accelerator x-ray dose monitoring device.Fig. 2 shows the side view that is provided with the collimating apparatus that detects detector set.Fig. 3 is the front elevation of the collimating apparatus of two x-ray dose monitoring detectors about demonstration is provided with.Referring to Fig. 1-3, comprise: the accelerator x-ray source 2 that is used for radiation X ray according to the X-radiation imaging system 1 in the specific embodiment of the present invention; Be used for the collimating apparatus 10 that the X ray to 2 radiation of accelerator x-ray source collimates; To penetrating the detection detector 3,4 that object to be detected 5 x-ray dose is afterwards surveyed; And be used for accelerator x-ray dose monitoring detector 6 that the x-ray dose that accelerator 2 gives off is monitored, wherein based on the X-radiation dosage of described x-ray dose monitoring detector 6 monitorings the x-ray dose that detects detector 3,4 and measure is proofreaied and correct, be it is characterized in that: described x-ray dose monitoring detector 6 is arranged at least one side of collimating slit 12 of described collimating apparatus 10.
As shown in Figure 1, accelerator 2 as x-ray source accelerates to very high-energy by for example microwave accelerating tube or current in electrostatic accelerating tube etc. with electronics, when electron bombard target P, because the bremsstrahlung of electronics in target material is being the X ray that a large amount of pencil-beam forms appear in rotational symmetry with the electron motion direction.The X ray of accelerator target spot P emission becomes fladellum behind fan beam collimator 10 collimations, see through object to be detected 5 back x-ray doses and survey for detecting detector 3,4.Its dosage will be attenuated when X ray sees through object to be detected 5, and the relative attenuation of dosage is relevant with the equivalent mass thickness of object to be detected 5.Recording ray see through to detect detector 3,4 every be the damping capacity of the relative dosage of pixel, promptly form the transmitted radiation image of an amplitude object.
Because the dosage of accelerator 2 each pulse output is non-constant on time dimension, need monitor in real time and proofread and correct.Correspondingly, accelerator x-ray dose monitoring device in a kind of X-radiation imaging system is provided in the above-mentioned embodiment of the present invention, it comprises: x-ray dose monitoring detector 6, wherein the x-ray dose that detects detector 3,4 measurements is proofreaied and correct based on the X-radiation dosage of described x-ray dose monitoring detector 6 monitorings.In one embodiment, described x-ray dose monitoring detector 6 is arranged at least one side of collimating slit 12 of described collimating apparatus 10, is used to monitor the dosage of the X ray that gives off from accelerator 2.
Because it is by changing the position of dose monitoring point, monitoring dose detector 6 is arranged on the collimating apparatus 2 of fladellum, this monitoring detector is very near from accelerator 2 target spot P, and accelerator 2 dosage of its acceptance are very high, thereby guarantees that Monitoring Data has very high statistical.By above-mentioned monitoring dose detector 6 is set, the variation of X-radiation dosage on time dimension that give off of monitoring accelerator 2 real-time and accurately.Based on the variation of X-radiation dosage on time dimension of above-mentioned x-ray dose monitoring detector 6 monitorings, above-mentioned correspondingly being delivered in the variation on the time dimension as radiogenic accelerator 2 detected on the detector 3,4.Particularly, because the dosage of the X ray of radiogenic accelerator 2 changes, detect the dosage that detects on the detector 3,4 and also change accordingly.Based on above-mentioned transitive relation, promptly can proofread and correct the x-ray dose that detects detector 3,4 measurements according to the X-radiation dosage of described x-ray dose monitoring detector 6 monitorings.Further, because described x-ray dose monitoring detector 6 is arranged at least one side of collimating slit 12 of described collimating apparatus 10, it does not stop passing through of normal X ray line, thereby can not reduce the statistical of the detection data that detects detector 3,4.
Referring to Fig. 2, in one embodiment, described x-ray dose monitoring detector 6 is arranged on the side of collimating slit 12 of described collimating apparatus 10.But the present invention is not limited only to this.Referring to Fig. 3, in one embodiment, described x-ray dose monitoring detector 6 comprises first, second monitoring detector portion 8,8 ', and described first, second monitoring detector portion 8,8 ' is separately positioned on the both sides of collimating slit 12 of described collimating apparatus 10.
In Fig. 1, described detection detector is formed L shaped detector by being arranged on accelerator 2 top-right detectors 3 with the detector 4 that is arranged on accelerator 2 opposite sides, but the present invention is not limited only to this, and can be the detector of any suitable shape.
Referring to Fig. 2 and Fig. 3, described x-ray dose monitoring detector 6 is made up of a plurality of detector modules 11.But the present invention is not limited to this, also can only be made up of a detector module 11.Referring to Fig. 2 and Fig. 3, in a preferred embodiment, described x-ray dose monitoring detector 6 is made up of a plurality of detector modules 11, and described a plurality of detector modules 11 become substantial linear to arrange along the length direction that is parallel to described collimating slit 12.
Further, referring to Fig. 2 and Fig. 3, one or more detector modules 11 are by being set on the collimating apparatus 10 in the groove that is mounted to collimating slit 12 one or both sides.Obviously, the present invention is not limited to this, and can be set on the collimating apparatus 10 by any suitable mode.
When x-ray dose monitoring detector 6 was made up of a plurality of detector modules 11, the radiation dose that each detector module 11 is monitored added up, thereby has better statistical with respect to the structure of single detector module 11.And when described a plurality of detector modules 11 become roughly to be in line arrangement along the length direction that is parallel to described collimating slit 12, can guarantee further that each detector module 11 is roughly suitable with respect to the distance of the main beam part of X ray, thereby further improve the statistical of monitoring detector 6.
Correspondingly, each in described first, second monitoring detector portion 8,8 ' is made up of at least one detector module 11.Preferably, each in described first, second monitoring detector portion 8,8 ' is made up of a plurality of detector modules 11, and described a plurality of detector modules 11 are along the linear arrangement of length direction that is parallel to described collimating slit 12.
4 pairs of methods of proofreading and correct according to the accelerator 2X roentgen dose X in the X-radiation imaging system 1 of the specific embodiment of the present invention describe with reference to the accompanying drawings.Referring to Fig. 4, the method for the accelerator 2X roentgen dose X in the X-radiation imaging system 1 being proofreaied and correct according to the present invention comprises step: the x-ray dose monitoring detector 6 that will be used for that the x-ray dose that accelerator 2 gives off is monitored is arranged at least one side (S1 step) of the collimating slit 12 of described collimating apparatus 10; Drive accelerator x-ray source 2 radiation X rays, and obtain the x-ray dose (S2 step) that the accelerator 2 of x-ray dose monitoring detector 6 monitorings of accelerator 2 gives off; And the x-ray dose that detects detector 3,4 and measure is proofreaied and correct (S3 step) based on the X-radiation dosage of described x-ray dose monitoring detector 6 monitorings.
In one embodiment, described x-ray dose monitoring detector 6 is made up of a plurality of detector modules 11, and described a plurality of detector modules 11 are along the linear arrangement of length direction that is parallel to described collimating slit 12.At this moment, preferably, the step that obtains the x-ray dose that the radiation from machine of accelerator x-ray dose monitoring device monitoring goes out also comprises: the summation of the radiation dose of measuring according to each detector module 11 is with the step of the x-ray dose that obtains accelerator 2 and give off.Need to prove that in case detector module 11 and accelerator 2 and relative position thereof are chosen, then quantity or the proportionate relationship between the radiation dose that sends of the radiation dose of detector module 11 monitoring and accelerator 2 will be determined.By the radiation dose of monitoring detector module 11, promptly can obtain the radiation dose that relevant accelerator 2 sends.As previously mentioned, when x-ray dose monitoring detector 6 was made up of a plurality of detector modules 11, the radiation dose that each detector module 11 is monitored added up, thereby has better statistical with respect to the structure of single detector module 11.
Describe below with reference to Fig. 3 and 5 pairs of methods according to the skew of the accelerator target spot P in the monitoring X-radiation imaging system of the specific embodiment of the present invention.Referring to Fig. 3 and 5, the method that is used for monitoring the accelerator target spot P skew of X-radiation imaging system according to the present invention comprises step: first, second x-ray dose monitoring detector 8,8 ' that will be used for the x-ray dose that accelerator 2 gives off is monitored is separately positioned on the both sides (B1 step) of the collimating slit 12 of described collimating apparatus 10; Drive accelerator x-ray source 2 with radiation X ray, and obtain first, second x-ray dose (B2 step) that the accelerator 2 of first, second x-ray dose monitoring detector 8,8 ' monitoring gives off; Based on the difference of described first, second x-ray dose, obtain relative deviation value Y (B3 step) about accelerator target spot P skew; And, determine that accelerator target spot P produces skew (B4 step) as described relative deviation value Y during greater than predetermined threshold value.
In a kind of preferred embodiment, first, second x-ray dose monitoring detector 8,8 ' is arranged on the both sides of collimating slit 11 of described collimating apparatus 10 substantially symmetrically with respect to described collimating slit 12.Then described relative deviation value Y is determined by following formula: Y=| (A-B)/(A+B) |, wherein A, B represent first, second x-ray dose that first, second x-ray dose monitoring detector 8,8 ' monitors respectively.
When determining that relative deviation value that accelerator target spot P produces is greater than predetermined threshold value, then give the alarm, so that the operator adjusts and proofreaies and correct the position of accelerator target spot P.
Though the present invention by the variation of X-radiation dosage on time dimension based on above-mentioned x-ray dose monitoring detector 6 monitorings, proofreaies and correct the radiation dose that detects detector 3,4 measurements.But; the present invention is not limited to this; according to above-mentioned technical scheme; all fladellum X ray accelerator systems; on its collimating apparatus, inlay one or more groups monitoring detector; by monitoring accelerator dosage angle changes in distribution, thereby the scheme of output energy that also can monitoring accelerator all belongs to protection scope of the present invention.
Though some embodiment of this present general inventive concept are shown and illustrate, those skilled in the art will appreciate that, under the situation of principle that does not deviate from this present general inventive concept and spirit, can make a change these embodiment, scope of the present invention limits with claim and their equivalent.
Claims (18)
1. the accelerator x-ray dose monitoring device in the X-radiation imaging system, wherein said X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for collimating apparatus that the accelerator X ray is collimated; Be used to survey the detection detector that penetrates object to be detected x-ray dose afterwards, described accelerator x-ray dose monitoring device comprises:
The x-ray dose monitoring detector, wherein the X-radiation dosage that monitors based on described x-ray dose monitoring detector to detect detector measurement to x-ray dose proofread and correct, it is characterized in that:
Described x-ray dose monitoring detector is arranged at least one side of collimating slit of described collimating apparatus, is used to monitor the dosage of the X ray that goes out from radiation from machine.
2. accelerator x-ray dose monitoring device according to claim 1, wherein:
Described x-ray dose monitoring detector comprises first, second monitoring detector portion, and described first, second monitoring detector portion is arranged on respectively on the both sides of collimating slit of described collimating apparatus.
3. accelerator x-ray dose monitoring device according to claim 1, wherein:
Described x-ray dose monitoring detector is made up of at least one detector module.
4. accelerator x-ray dose monitoring device according to claim 3, wherein:
Described x-ray dose monitoring detector is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
5. accelerator x-ray dose monitoring device according to claim 2, wherein:
In described first, second monitoring detector portion each is made up of at least one detector module.
6. accelerator x-ray dose monitoring device according to claim 5, wherein:
In described first, second monitoring detector portion each is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
7. X-radiation imaging system comprises:
The accelerator x-ray source that is used for radiation X ray;
Be used for collimating apparatus that the accelerator X ray is collimated;
Be used to survey the detection detector that penetrates object to be detected x-ray dose afterwards; And
Be used for accelerator x-ray dose monitoring detector that the x-ray dose that radiation from machine goes out is monitored,
Wherein the x-ray dose that detects detector measurement is proofreaied and correct, be it is characterized in that based on the X-radiation dosage of described x-ray dose monitoring detector monitoring:
Described x-ray dose monitoring detector is arranged at least one side of collimating slit of described collimating apparatus.
8. X-radiation imaging system according to claim 7, wherein:
Described x-ray dose monitoring detector comprises first, second monitoring detector portion, and described first, second monitoring detector portion is arranged on respectively on the both sides of collimating slit of described collimating apparatus.
9. X-radiation imaging system according to claim 7, wherein:
Described x-ray dose monitoring detector is made up of at least one detector module.
10. X-radiation imaging system according to claim 9, wherein:
Described x-ray dose monitoring detector is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
11. X-radiation imaging system according to claim 8, wherein: each in described first, second monitoring detector portion is made up of at least one detector module.
12. X-radiation imaging system according to claim 11, wherein:
In described first, second monitoring detector portion each is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
13. the method that the accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct, wherein the X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; And to penetrating the detection detector that object to be detected x-ray dose is afterwards surveyed, described method comprises step:
The x-ray dose monitoring detector that will be used for that the x-ray dose that radiation from machine goes out is monitored is arranged at least one side of the collimating slit of described collimating apparatus;
Drive accelerator x-ray source radiation X ray, and obtain the x-ray dose that the radiation from machine of accelerator x-ray dose monitoring device monitoring goes out; And
X-radiation dosage based on described x-ray dose monitoring detector monitoring is proofreaied and correct the x-ray dose that detects detector measurement.
14. the method that the accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct according to claim 13, wherein:
Described x-ray dose monitoring detector is made up of a plurality of detector modules, and described a plurality of detector modules are along the linear arrangement of length direction that is parallel to described collimating slit.
15. the method that the accelerator x-ray dose in the X-radiation imaging system is proofreaied and correct according to claim 14, the step that wherein obtains the x-ray dose that the radiation from machine of accelerator x-ray dose monitoring device monitoring goes out also comprises:
The summation of the radiation dose of measuring according to each detector module is with the step of the x-ray dose that obtains radiation from machine and go out.
16. a method of monitoring the accelerator target spot P skew in the X-radiation imaging system, wherein the X-radiation imaging system comprises: the accelerator x-ray source that is used for radiation X ray; Be used for the collimating apparatus that the X ray to the radiation of accelerator x-ray source collimates; And, comprise step to penetrating the detection detector that object to be detected x-ray dose is afterwards surveyed:
First, second x-ray dose monitoring detector that will be used for the x-ray dose that radiation from machine goes out is monitored is separately positioned on the both sides of the collimating slit of described collimating apparatus;
Drive accelerator x-ray source radiation X ray, and obtain first, second x-ray dose that the radiation from machine of first, second x-ray dose monitoring detector monitoring goes out;
Based on the difference of described first, second x-ray dose, obtain relative deviation value about accelerator target spot P skew; And
When described relative deviation value during, determine that accelerator target spot P produces skew greater than predetermined threshold value.
17. the method for the skew of the accelerator target spot P in the monitoring X-radiation imaging system according to claim 16, wherein:
First, second x-ray dose monitoring detector is arranged on substantially symmetrically with respect to described collimating slit on the both sides of collimating slit of described collimating apparatus; And
Described relative deviation value Y is determined by following formula: Y=| (A-B)/(A+B) |, wherein A, B represent first, second x-ray dose that first, second x-ray dose monitoring detector monitors respectively.
18. the method according to the skew of the accelerator target spot P in claim 16 or the 17 described monitoring X-radiation imaging systems also comprises:
When determining that relative deviation value that accelerator target spot P produces is greater than predetermined threshold value, the step that gives the alarm.
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Cited By (10)
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| FR2626432B1 (en) * | 1988-01-25 | 1995-10-13 | Commissariat Energie Atomique | X-RAY TOMOGRAPHY APPARATUS |
| US6094469A (en) * | 1998-10-21 | 2000-07-25 | Analogic Corporation | Computed tomography system with stable beam position |
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| CN103353605A (en) * | 2013-07-02 | 2013-10-16 | 中国科学院近代物理研究所 | Cross calibration method used for online beam monitoring detector in three-dimensional spot scanning beam distribution |
| CN104880148A (en) * | 2014-02-28 | 2015-09-02 | 同方威视技术股份有限公司 | Method for measuring deviation between objects |
| CN104880148B (en) * | 2014-02-28 | 2018-01-16 | 同方威视技术股份有限公司 | A kind of method of deviation between measurement object |
| CN104634796A (en) * | 2014-12-11 | 2015-05-20 | 清华大学 | Alignment system and alignment method for container or vehicle inspection system |
| US9910184B2 (en) | 2014-12-11 | 2018-03-06 | Tsinghua University | Alignment system and method for container or vehicle inspection system |
| CN108120725A (en) * | 2016-11-30 | 2018-06-05 | 住友化学株式会社 | Flaw detection apparatus, defect detecting method, the manufacturing method of membrane winding body and membrane winding body |
| CN109557115A (en) * | 2018-08-16 | 2019-04-02 | 公安部第研究所 | X-ray covering of the fan drift detector and corresponding line scanning imagery equipment |
| CN109407162A (en) * | 2018-12-24 | 2019-03-01 | 同方威视技术股份有限公司 | Inspection system and imaging method |
| CN109407162B (en) * | 2018-12-24 | 2024-04-02 | 同方威视技术股份有限公司 | Inspection system and imaging method |
| CN112146601A (en) * | 2019-06-27 | 2020-12-29 | 清华大学 | Radiation imaging method and device based on dose field detection |
| US11369333B2 (en) | 2019-06-27 | 2022-06-28 | Nuctech Company Limited | Method and apparatus for detecting dose distribution of article |
| WO2023125131A1 (en) * | 2021-12-30 | 2023-07-06 | 同方威视科技（北京）有限公司 | Radiation inspection system |
| CN114732426A (en) * | 2022-04-06 | 2022-07-12 | 四川大学 | Three-dimensional ultrafast X-ray CT imaging system and imaging method |
| CN114732426B (en) * | 2022-04-06 | 2023-04-07 | 四川大学 | Three-dimensional ultrafast X-ray CT imaging system and imaging method |
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