CN202562861U - Device for radial scanning imaging - Google Patents
Device for radial scanning imaging Download PDFInfo
- Publication number
- CN202562861U CN202562861U CN2012200855010U CN201220085501U CN202562861U CN 202562861 U CN202562861 U CN 202562861U CN 2012200855010 U CN2012200855010 U CN 2012200855010U CN 201220085501 U CN201220085501 U CN 201220085501U CN 202562861 U CN202562861 U CN 202562861U
- Authority
- CN
- China
- Prior art keywords
- ray
- unit
- equipment
- numerical value
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 106
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000003491 array Methods 0.000 claims abstract description 26
- 238000007689 inspection Methods 0.000 claims description 75
- 230000009977 dual effect Effects 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 30
- 239000000523 sample Substances 0.000 claims description 24
- 238000010494 dissociation reaction Methods 0.000 claims description 16
- 230000005593 dissociations Effects 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 15
- 238000003325 tomography Methods 0.000 claims description 9
- 230000005855 radiation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a device for radial scanning imaging, which comprises multiple ray generators and a ray detection device, wherein the ray generators are uniformly distributed along a circular arc, and emit radial beams to an examination object sequentially or simultaneously in a scanning period. The ray detection device may be multi-section type semi-enclosed structure composed of a plurality of ray detector linear arrays, or circular arc shaped structure provided thereon with multiple ray detection units distributed uniformly along a circular arc. During the whole examination process, the device can obtain comprehensive projection values rapidly without rotation, so as to reduce the examination time effectively.
Description
Technical field
The utility model relates to the radiant image field, particularly is used for the equipment of ray scanning imaging.
Background technology
Current, because safety inspection receives the attention of countries in the world day by day, radiation imaging apparatus has been widely used in public place and key sectors such as airport, station, customs, subway, harbour, thereby article such as luggage, goods are carried out the safety inspection of efficient stable.
Radiation imaging apparatus is the exponential damping principle according to ray, by radiographic source divergent-ray bundle the inspection object is scanned, and beam is received by the ray harvester after passing the inspection object.According to the ray detection numerical value that the ray harvester is received, can synthesize or reconstruction of three-dimensional images and showing.
Fig. 1 shows the structural representation of existing radiation imaging apparatus.
Radiation imaging apparatus comprises slip ring 13, the radiographic source 11 that is connected with slip ring 13, is provided with 12 with radiographic source 11 detections relative and that be connected on the slip ring 13, and the conveyer 14 that transmits the inspection object.In checking process, slip ring 13 drives radiographic sources 11 and sniffer 12 rotations, obtaining the ray projection numerical value on the different angles, and obtains the faultage image of inspection object through method for reconstructing.
The applicant furthers investigate existing radiation imaging apparatus, find that existing radiation imaging apparatus need drive radiographic source 11 and sniffer 12 rotations by slip ring 13, and the rotational speed of slip ring 13 is limited, makes detection efficiency not high.For example, the desired rate of being open to the custom of civil aviaton's article is 0.5 meter per second, and existing radiation imaging apparatus is difficult to satisfy these needs.
The utility model content
The inventor of the utility model has proposed a kind of new technical scheme to the not high problem of existing radiation imaging apparatus detection efficiency.
A purpose of the utility model provides a kind of equipment that is used for the ray scanning imaging, effectively shortens the supervision time of inspection object.
The utility model provides a kind of equipment that is used for the ray scanning imaging.This equipment comprises a plurality of ray generators and ray detecting device.Wherein, a plurality of ray generators evenly distribute along circular arc.In a scan period, a plurality of ray generators send beam to the inspection object successively, to accomplish the scanning to a tomography.Ray detecting device is used to gather the ray projection numerical value of the beam that a plurality of ray generator sends.
The central angle of the circular arc that preferably, a plurality of ray generator constituted is at least π+2 γ.Wherein, 2 γ are the fan angle of the fan-ray beam that ray generator sent.
Preferably, each ray generator comprises at least one ray emission unit.
Alternatively, beam is fan-ray beam or the beam group for being made up of a plurality of parallel linear beams.
Alternatively, ray detecting device is circular-arc ray detector array.In this ray detector array, a plurality of X-ray detection Xs unit evenly distributes along circular arc.
Preferably, ray detecting device comprises a plurality of ray detector linear arraies.Each ray detector linear array is made up of a plurality of X-ray detection X unit along line spread.A plurality of ray detector linear arraies are positioned at same plane and connect successively through the end, and two ray detector linear arraies at two ends are continuous, to constitute semiclosed framework.
Alternatively, the number of ray detector linear array can be greater than 3.In this case; A plurality of ray detector linear arraies are provided with according to following mode: adjacent two ray detector linear array angulations are greater than pi/2, and a plurality of ray detector linear array can detect the beam that whole ray generator sends.
Preferably, the number of ray detector linear array can be 3.In this case; 3 ray detector linear arraies are provided with according to following mode: the ray detector linear array that is positioned at both sides is all perpendicular with middle ray detector linear array, and said 3 ray detector linear arraies can detect the beam that whole ray generator sends.
Preferably, a plurality of ray detector linear arraies plane, place and a plurality of ray generator place plane parallel, and this two plane is perpendicular with inspection motion of objects direction.
Preferably, this equipment also comprises image-generating unit.The ray detection numerical value that this image-generating unit is gathered ray detecting device is handled, to obtain the image of inspection object.
Preferably; In one embodiment; For the ray detecting device that is made up of a plurality of ray detector linear arraies, the pairing a plurality of X-ray detection Xs of at least one ray generator unit does not form the perpendicular straight line in axis of the beam that is sent with this ray generator.Image-generating unit is directed against each in above-mentioned at least one ray generator, and isometric type dummy detector linear array is set.This isometric type dummy detector linear array comprises a plurality of along line spread and the virtual probe unit that is equally spaced.Each ray generator equates with the distance of corresponding isometric type dummy detector array.Image-generating unit can be according to the line of ray generator and X-ray detection X unit, confirms and the corresponding X-ray detection X of virtual probe unit unit, and based on the ray detection numerical value of this X-ray detection X unit, obtains the ray detection numerical value of this virtual probe unit.All the ray detection numerical value of isometric type dummy detector linear array can constitute equidistance fan-beam projection numerical value.
In another embodiment, for the ray detecting device that is made up of circular-arc ray detector array, when beam was fan-ray beam, the ray detection numerical value that this device obtained constituted equidistance fan-beam projection numerical value; When beam during for the beam group that constitutes by a plurality of parallel line beams, the ray detection numerical value formation collimated beam projection values that this device obtained.
Preferably, the X-ray detection X unit can be pseudo-dual intensity probe unit.Image-generating unit can carry out the dual intensity resolution process to equidistance fan-beam projection numerical value or collimated beam projection values; To obtain the dual intensity coefficient of dissociation of different substrate materials material; And utilize filter back-projection algorithm that the dual intensity coefficient of dissociation of different substrate materials material is carried out the dual intensity reconstruction, thereby obtain the image of inspection object.
Preferably, this equipment also can comprise database.This database is used to store the atomic number and the electron density of suspicious object.Data in the atomic number of the inspection object that image-generating unit can be obtained in dual intensity is rebuild and electron density distribution and this database are compared, to judge whether the inspection object is suspicious object.
The utility model also provides other a kind of equipment that is used for the ray scanning imaging.This equipment comprises ray detecting device and a plurality of ray generator.Wherein, a plurality of ray generators evenly distribute along circular arc.In a scan period, a plurality of ray generators send beam to the inspection object simultaneously, to accomplish the scanning to a tomography.Ray detecting device is used to gather the ray projection numerical value of the beam that a plurality of ray generator sends.
The central angle of the circular arc that preferably, a plurality of ray generator constituted is at least π.
Preferably, each said ray generator can comprise a plurality of ray emission unit.Wherein, the beam launched of a plurality of ray emission unit is parallel line beam.Ray detecting device can comprise a plurality of X-ray detection Xs unit.All pairing X-ray detection X unit, ray emission unit is not overlapping.
Preferably, a plurality of X-ray detection X unit can evenly distribute along circular arc.The ray emission unit can be corresponding one by one with the X-ray detection X unit.The ray detection numerical value that whole X-ray detection X unit are obtained can constitute the collimated beam projection values.
Preferably, plane, place, a plurality of X-ray detection Xs unit and a plurality of ray generator place plane parallel, and this two plane is perpendicular with inspection motion of objects direction.
Preferably, this equipment also comprises image-generating unit.The ray detection numerical value that this image-generating unit is gathered ray detecting device is handled, to obtain the image of inspection object.
Preferably, the X-ray detection X unit can be pseudo-dual intensity probe unit.Image-generating unit can carry out the dual intensity resolution process to the collimated beam projection values, with the dual intensity coefficient of dissociation of acquisition different substrate materials material, and utilizes filter back-projection algorithm that the dual intensity coefficient of dissociation of different substrate materials material is carried out the dual intensity reconstruction, thereby obtains the image of inspection object.
Preferably, this equipment also can comprise database.This database can be stored the atomic number and the electron density of suspicious object.The atomic number of the inspection object that image-generating unit will be obtained in dual intensity is rebuild and the data in electron density distribution and the database are compared, to judge whether the inspection object is suspicious object.
The equipment of the utility model comprises a plurality of ray generators and the ray detecting device that matches.Wherein, a plurality of ray generators can evenly distribute along circular arc, and ray detecting device can be the semiclosed framework of multisection type that constitutes of a plurality of ray detector linear arraies or by the X-ray detection X array of ovalize.Through adopting this structure setting, saved the rotary slip ring device in traditional ray scanning imaging device.In actual detection, a plurality of ray generators send beam to the inspection object successively, and ray detecting device is responsible for gathering ray projection numerical value, thereby accomplish the scanning to a tomography.In whole checking process, a plurality of ray generators and ray detecting device need not to rotate, and can obtain complete ray projection numerical value fast, have effectively reduced the used time of inspection.
Description of drawings
The accompanying drawing that constitutes the part of instructions has been described the embodiment of the utility model, and is used to explain the principle of the utility model together with the description.
With reference to accompanying drawing, according to following detailed, can be expressly understood the utility model more, wherein:
Fig. 1 is the existing structural representation that is used for the equipment of ray scanning imaging.
Fig. 2 is the structural representation of an embodiment that is used for the equipment of ray scanning imaging according to the utility model a kind of.
Fig. 3 is that ray generator and the position of ray detector linear array among this embodiment concerns synoptic diagram.
Ray generator, ray detector and virtual ray position of detector that Fig. 4 A and Fig. 4 B show in the zones of different concern synoptic diagram.
Fig. 5 is the structural representation of an embodiment of the equipment that is used for the ray scanning imaging of the another kind according to the utility model.
Fig. 6 is the process flow diagram according to an embodiment of a kind of method that ray detection numerical value is handled of the utility model.
Embodiment
To describe the various exemplary embodiments of the utility model now with reference to accompanying drawing in detail.It should be noted that: only if specify in addition, otherwise the positioned opposite of parts of in these embodiment, setting forth and step, numeral expression formula and numerical value do not limit the scope of the utility model.
Simultaneously, should be understood that the size of the various piece shown in the accompanying drawing is not to draw according to the proportionate relationship of reality for the ease of describing.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the utility model and application or use.
Possibly not go through for the known technology of association area those of ordinary skill, method and apparatus, but under suitable situation, said technology, method and apparatus should be regarded as a part of authorizing instructions.
In shown here and all examples of discussing, it only is exemplary that any occurrence should be interpreted as, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and the letter accompanying drawing below, therefore,, then in accompanying drawing subsequently, need further not discuss it in case defined in a certain Xiang Zaiyi accompanying drawing.
Fig. 2 shows the structural representation according to an embodiment of the equipment that is used for the ray scanning imaging of the utility model.
The ray scanning imaging device can comprise ray detecting device and a plurality of ray generator 21.
When the inspection object got into scanning area, a plurality of ray generators 21 can send beam to the inspection object successively, thereby a tomography of inspection object is scanned.
All beams are gathered by ray detecting device after passing the inspection object.
Ray detecting device can be an arbitrary shape, for example can be multisection type semi-closed structure or arc structure.In the present embodiment, the semiclosed syndeton of multisection type that is constituted with a plurality of ray detector linear arraies is that example describes.
A plurality of ray generators 21 can distribute along given shape, so that the inspection object passes through from the space that this given shape constituted.For example, a plurality of ray generators 21 can be along the frame setting of rectangular shaped rim, polygon frame or other geometric configuratioies, and the inspection object passes through from the inner space that above-mentioned frame constituted.In the present embodiment, a plurality of ray generator 21 evenly distributes along circular arc.The central angle of this circular arc is at least π+2 γ, and wherein 2 γ are the size at the complete fan of fladellum angle.
In the present embodiment, a plurality of ray detector linear arraies connect with segmentation structure.Particularly; Ray detector linear array 22, ray detector linear array 23 and ray detector linear array 24 are positioned at same plane and are connected successively through the end; And ray detector linear array 22 does not link to each other with ray detector linear array 24, to constitute the semiclosed framework of door case type.Wherein, each ray detector linear array can comprise a plurality of X-ray detection X unit along line spread.
The inspection object can be carried through overscan regions by transport 25.In a scan period, a plurality of ray generators 21 send beam to the inspection object successively, to accomplish the scanning to a tomography.The beam that ray generator 21 is sent is gathered by the ray detector linear array after passing the inspection object.Through the ray numerical value of being gathered is handled, can obtain checking the reconstructed image of object.
A plurality of ray generators plane, 21 place and plane, a plurality of ray detector linear array place should be two Different Plane.
Preferably, this two plane can be parallel, and all perpendicular with inspection motion of objects direction.Like this, can avoid the cross-talk and irradiation blind area of different probe units.
At this, at first brief account once, utilize fan-ray beam carry out accurate reconstruction the data completeness condition that must satisfy.This data completeness condition comprises: the first, the completeness condition of angle, and promptly the x ray irradiation x angle to the inspection object is at least π+2 γ, and wherein 2 γ are the size at the complete fan of fladellum angle.Guarantee under all scanning angles that the second, the ray numerical value that ray detector is gathered does not exist and blocks.That is to say, under all scanning angles, all can effectively be detected by ray detector by the beam that each ray generator produced.
In the present embodiment, the beam that each ray generator 21 is sent can be fladellum, and its fan angle can be 2 γ.Certainly, beam can be other shapes also, and is not limited to fladellum.For example, can be as required, each ray generator 21 is provided with one or more ray launching ports, but each ray launching port emitting linear shape beam.Like this, a plurality of ray launching ports of each ray generator 21 can be launched one group of parallel beam.
Because the central angle of the circular arc that a plurality of ray generators 21 in the present embodiment are constituted is π+2 γ, is equivalent to 21 pairs of ray generators and checks that it is the scanning of π+2 γ that object has carried out angular range.That is to say that the structure setting of a plurality of ray generators 21 of the utility model has been satisfied the complete requirement of angle in the data completeness condition.
About second requirement in the data completeness condition; Because a plurality of ray generators 21 have constituted an annular semi-closed structure; Ray detector linear array 22, ray detector linear array 23 and ray detector linear array 24 then constitute a corresponding with it frame shape semi-closed structure, and whole beams that each ray generator produced all can effectively be detected by the ray detector linear array.Therefore, this structure setting can be satisfied second requirement in the data completeness condition.
The X-ray detection X unit can be pseudo-dual intensity probe unit.Certainly, the X-ray detection X unit also can adopt the probe unit of other classifications, for example monoenergetic probe unit, multipotency probe unit or true dual intensity probe unit.
The pseudo-dual intensity probe unit that is adopted comprises two-layer crystal and the filter plate between two crystal.This filter plate can be the copper filter plate.The ground floor crystal obtains low energy ray numerical value, and second layer crystal obtains the high-energy ray numerical value after the shaping.This pseudo-dual intensity probe unit has inexpensive characteristics, is easy to apply.
Need to prove that the number of ray detector linear array is not limited to three shown in Fig. 2.For example, can utilize four or more the ray detector linear array of more number gather ray numerical value.In this case, adjacent two ray detector linear array angulations should be greater than pi/2.
Can also adjust number, angle and the length of the linear array of detector according to factors such as the volume of checking object, shapes, but set ray detector linear array must at first satisfy the data completeness condition.
A plurality of ray detector linear arraies of the utility model are owing to adopt the semiclosed framed structure of multisection type, not only can complete collection ray projection numerical value, and also higher than circular arc detector array cost performance.Specifically, for the probe unit of similar number, the inner space that a plurality of ray detector linear arraies of the utility model are constituted is bigger, allows the bigger inspection object of volume to pass through; And work as the inner space that is constituted when suitable, the probe unit that this structural arrangement adopted of the utility model still less can reduce equipment cost.
In addition, also can adopt the semiclosed syndeton of multisection type shown in the ray detecting device alternate figures 2 of other shapes.For example, can select X-ray detection X circular arc array for use.This X-ray detection X circular arc array can comprise along the equally distributed a plurality of X-ray detection Xs of circular arc unit.
The equipment that is used for the ray scanning imaging of the utility model also can comprise image-generating unit.This image-generating unit can be handled the ray detection numerical value that the ray detector linear array is gathered, to obtain the faultage image of inspection object.
Certainly, the ray detection numerical value that the ray detector linear array is gathered also can be sent to main control and data processing terminal via data transmission system, and carries out numerical value by main control and data processing terminal and handle.
Data are handled be described in detail before, at first introduce and utilize method that fan-ray beam rebuilds structural requirement the ray probe unit.
Fan-beam weighted filtering back projection type (FBP) method for reconstructing of standard only is applicable to arranging of two kinds of probe units: a kind of promptly a plurality of probe units are circular-arc arranges in order to wait corner structure, and the angle between the pairing ray of each probe unit equates; Another kind is the equidistance structure, and promptly a plurality of probe units linearly shape are arranged, and the distance between each detector cells is identical, and the axis of the beam that ray generator sent and the formed straight line of a plurality of probe unit are perpendicular.When adopting linear beam group, can adopt with the similar method of above-mentioned method for reconstructing and rebuild, give unnecessary details again at this.
In the present embodiment; Because the doughnut structure of a plurality of ray generators and the semiclosed shaped as frame structure of multisection type of a plurality of ray detector linear arraies make the pairing a plurality of X-ray detection Xs of part ray generator unit not meet the requirement of the desired equidistance structure of aforementioned method for reconstructing.Specifically, the pairing a plurality of X-ray detection Xs of part ray generator unit does not form the perpendicular straight line in axis of the beam that is sent with this ray generator.Below in conjunction with Fig. 3 and Fig. 4 this problem is carried out illustrated in detail.
Fig. 3 shows that the position of ray generator and ray detector linear array concerns synoptic diagram in the present embodiment.
As shown in Figure 3; The pairing a plurality of X-ray detection Xs of ray generator A unit all is positioned on the ray detector linear array 24; And the axis of the beam that the straight line at place, a plurality of X-ray detection Xs unit and ray generator A are sent is perpendicular, and the distance between each detector cells is identical.That is to say that for ray generator A, these detector cells belong to the desired equidistance structure of standard fan-beam FBP method for reconstructing.
Similarly also comprise the pairing a plurality of detector cells of ray generator B and C with it.And the pairing a plurality of detector cells of remaining ray generator all do not belong to the desired equidistance structure of standard fan-beam FBP method for reconstructing.
For this problem is described better, we are divided into five zones with the circular arc at a plurality of ray generators place.Wherein, the beam launched of the ray generator 21 of zone in 1 only is responsible for collections by the linear array detector 24 on right side; The beam that ray generator 21 in the zone 2 is launched is responsible for collection by the detector 24 on right side and the detector 23 of bottom; The beam that ray generator 21 in the zone 3 is launched only is responsible for collection by the detector 23 of bottom; The beam that ray generator 21 in the zone 4 is launched is responsible for collection by the detector 22 in left side and the detector 23 of bottom; The beam that ray generator 21 in the zone 5 is launched only is responsible for collection by the detector 22 in left side.
Existing is example with the ray generator in the zone 1 with corresponding ray detector 21, is that non-equidistance ray collection numerical value describes to the ray numerical value of being gathered.
Fig. 4 A is that ray generator, ray detector and the virtual ray position of detector in the zone 1 concerns synoptic diagram.
Shown in Fig. 4 A, actual detector array 24 is perpendicular with the axis of the beam that ray generator A is sent, but the axis out of plumb of the beam that is sent with ray generator D.Therefore, for ray generator D, it is not that the equidistance ray is gathered numerical value that the ray that detector array 24 is obtained is gathered numerical value.Wherein, in the present embodiment, β is the pairing sampling angle of data for projection, and 2 γ are the maximum fan-angle of fan-ray beam.
In order to address this problem, image-generating unit can to ray generator D be provided with the corresponding isometric type dummy detector of ray generator D linear array 24 '.
Isometric type dummy detector linear array 24 ' can comprise is a plurality of along line spread and the virtual probe unit that is equally spaced.The axis of the beam of isometric type dummy detector linear array 24 ' sent with ray generator D is perpendicular.
Then; Image-generating unit is according to the line of ray generator D and X-ray detection X unit 24; Confirm and the corresponding X-ray detection X of virtual probe unit n1 unit m1, and, obtain the ray detection numerical value of virtual probe unit n1 based on the ray detection numerical value of X-ray detection X unit m1.Isometric type dummy detector linear array 24 ' go up other virtual probe units this method also capable of using to obtain.
Fig. 4 B is that ray generator E, ray detector array and the virtual ray position of detector in the zone 2 concerns synoptic diagram.
In Fig. 4 B, the beam that the ray generator E in the zone 2 is launched is by the detector 24 on right side and the detector 23 common responsible collections of bottom, and the ray numerical value of therefore being gathered is not that the isometric type ray is gathered numerical value.
With Fig. 4 category-A seemingly, gather numerical value in order to obtain the isometric type ray, image-generating unit be provided with dummy detector linear array 23 ' with dummy detector linear array 24 ', and with two dummy detector linear arraies along the straight line assembled arrangement.
Then, image-generating unit confirms that according to the line of ray generator E and X-ray detection X unit 23 and X-ray detection X unit 24 virtual probe unit n2 is corresponding with X-ray detection X unit m2, and virtual probe unit n3 is corresponding with X-ray detection X unit m3.Can obtain the ray detection numerical value of virtual probe unit n2 and n3 based on the ray detection numerical value of X-ray detection X unit m2 and m3.
For the pairing ray detector linear array of the ray generator among the regional 3-5, also can adopt similar approach to obtain corresponding dummy detector linear array, repeat no more at this.
Need to prove that adopt in the isometric type dummy detector linear array that said method obtained, a plurality of virtual ray probe units are equidistance not, perhaps the corresponding a plurality of virtual probe units in the X-ray detection X unit of a reality.For this situation, can after obtaining final image, carry out post-processed; Perhaps adopt suitable method, the position of a plurality of virtual probe units of being obtained is suitably adjusted, to satisfy equidistant requirement between each virtual ray probe unit.
Each ray generator also should equate with the distance of corresponding isometric type dummy detector array.For example, can be the distance between ray generator A and the ray detector linear array 24 with this distance setting.
Like this, all the ray detection numerical value of the linear array of the pairing detector of isometric type dummy detector linear array and ray generator A, B and C has just constituted equidistance fan-beam projection numerical value.
Similarly, adopting under the ray detecting device situation that is made up of circular-arc ray detector array, if beam is a fladellum, the ray detection numerical value that then this device obtained constitutes equidistance fan-beam projection numerical value; If the beam group of beam for being made up of a plurality of parallel linear beams, the ray detection numerical value that then this device obtained constitutes the collimated beam projection values.No longer give unnecessary details at this.
For the X-ray detection X unit is pseudo-dual intensity probe unit, and image-generating unit can carry out the dual intensity resolution process to equidistance fan-beam projection numerical value, to obtain the dual intensity coefficient of dissociation of different substrate materials material.Afterwards, utilize filter back-projection algorithm that the dual intensity coefficient of dissociation of different substrate materials material is carried out the dual intensity reconstruction, thereby obtain the image of inspection object.
This equipment also can comprise database.This database can be stored the atomic number and the electron density of suspicious object.The atomic number of the inspection object that image-generating unit will be obtained in dual intensity is rebuild and the data in electron density distribution and the database are compared, to judge whether the inspection object is suspicious object.
The equipment of the utility model needn't be provided with slip-ring device, just can accomplish the scanning imagery to the inspection object.In a scan period, a plurality of ray generators send beam to the inspection object successively, and a plurality of ray detector linear arraies are responsible for gathering ray projection numerical value, thereby accomplish the scanning to a tomography.At whole detection process, equipment need not to rotate and can obtain complete ray projection numerical value fast, has effectively reduced the used time of inspection.
In addition, because the equipment of the utility model need not be provided with slip-ring device, the overall volume of equipment is littler, and equipment cost is lower, and phenomenon such as the imaging of having avoided rotation process to cause is unintelligible, makes that the picture quality of the inspection object that obtained is higher.
In addition, the technical scheme of the utility model adopts the linear array of pseudo-dual intensity detector to cooperate short scanning computed tomography scanner uni to rebuild, and effectively reduces luggage and articles and blocks the influence for safety inspection.
Fig. 5 shows the structural representation that is used for the equipment of ray scanning imaging according to the another kind of the utility model.
This equipment comprises a plurality of ray generators 31 and ray detecting device 32.
A plurality of ray generator 31 evenly distributes along circular arc.The central angle of formed circular arc 312 is at least 180 °.In a scan period, a plurality of ray generators 31 can send beam to the inspection object simultaneously.Beam is detected by ray detecting device 32 after passing the inspection object.
Each ray generator 31 can be provided with a plurality of ray emission unit.In the present embodiment, each ray generator is provided with 5 ray emission unit 311.5 ray emission unit 311 can send parallel linear beam simultaneously, to form a beam group.See by figure, the crossover zone of a plurality of beam groups be scanning area 313 (Field of View, FOV).
Correspondingly, sniffer 32 comprises a plurality of X-ray detection Xs unit 321.A plurality of X-ray detection Xs unit 321 evenly distributes along circular arc 322.Circular arc 322 equates that with the radius of circular arc 312 central angle is the straight angle.Ray emission unit 311 on the ray generator 31 is corresponding one by one with ray receiving element 312 on the ray detecting device 32.Like this, all the beam launched of ray emission unit 311 is not in that to arrive the ray detecting device place overlapping.It can check that object carries out profile scanning when checking object through overscan regions 313.The ray detection numerical value that this device obtained constitutes the collimated beam projection values.
Then, the ray detection numerical value that image-generating unit is gathered ray detecting device 32 is handled, to obtain the image of inspection object.
Because in the present embodiment; All ray emission unit 311 equate with the distance between the X-ray detection X unit 321 accordingly; Ray detection numerical value to being obtained needn't be reset, and can directly carry out the dual intensity resolution process to this collimated beam projection values, to obtain the dual intensity coefficient of dissociation of different substrate materials material; And utilize filter back-projection algorithm that the dual intensity coefficient of dissociation of different substrate materials material is carried out the dual intensity reconstruction, thereby obtain the image of inspection object.
In addition, image-generating unit also can obtain the atomic number and the electron density of inspection object in dual intensity is rebuild, and these data and the atomic number and the electron density that are stored in the suspicious object in the database are compared, to judge whether the inspection object is suspicious object.
About method for reconstructing can be identical with the method among the last embodiment, repeat no more at this.
Need to prove; The equipment of the utility model is not limited to the structure shown in the figure; As long as can guarantee that the beam of being launched whole ray emission unit is not overlapping at arrival ray detecting device place; That is to say, should avoid taking place an X-ray detection X unit 321 and collect the beam of being launched two or more ray emission unit 311 simultaneously and get final product.For example, the central angle of circular arc 322 can be greater than the central angle of the formed circular arc 312 of a plurality of ray generators.The radius of circular arc 322 can be greater than the radius of circular arc 321.The number of X-ray detection X unit 321 can be more than the number of ray emission unit.
In addition, the circular shape of ray detecting device 32 also can be substituted by other structures, for example, adopts three section connection structures or multistage syndeton in the previous embodiment.As long as the beam that makes whole ray emission unit 311 launched is not overlapping when arriving ray detecting device 32.Correspondingly, need at first to obtain and the actual pairing virtual probe unit of probe unit, and obtain the detection numerical value of virtual probe unit based on the detection numerical value of actual detection unit.Utilize the X-ray detection X numerical value of virtual probe unit to rebuild afterwards, to obtain the image of inspection object.
Because a plurality of transmitter units 311 of this equipment can be checked object divergent-ray bundle simultaneously mutually, make the supervision time effectively shorten, reduced being open to the custom the time of inspection object greatly.
Fig. 6 shows the process flow diagram according to an embodiment of a kind of method that ray detection numerical value is handled of the utility model.
In step S11, the inspection object is carried out ray scanning and obtains ray detection numerical value.
Can utilize the aforementioned equipment that any one is used for the ray scanning imaging to scan and detect.Particularly, a plurality of ray generators capable of using send beam to the inspection object successively, to the scanning of a tomography.And utilize ray detecting device to gather beam, obtain ray detection numerical value.
At step S12, ray detection numerical value is reset, to obtain equidistance fan-beam projection numerical value.
Preferably, before this step, can carry out pre-service and correction by ground radiological survey X numerical value.This comprises that air value and this locality get that negative logarithm operation, homogeneity correction, detector bad track are judged and operation such as removal.
The ray detecting device and the fan-ray beam that are constituted with a plurality of ray detector linear arraies below are that example describes.Can suitably adjust with reference to this method for the ray detecting device of other structures and the beam of other shapes.
To this situation, can isometric type dummy detector linear array be set for each this ray generator.Isometric type dummy detector linear array can comprise a plurality of along line spread and the virtual probe unit that is equally spaced.
Each ray generator should equate with the distance of corresponding isometric type dummy detector array.
Then,, confirm and the corresponding X-ray detection X of virtual probe unit unit, and, obtain the ray detection numerical value of this virtual probe unit based on the ray detection numerical value of this X-ray detection X unit according to the line of ray generator and X-ray detection X unit.
All the ray detection numerical value of the linear array of the pairing detector of isometric type dummy detector linear array and ray generator A, B and C has just constituted equidistance fan-beam projection numerical value.
In the present embodiment, the method for ray detection numerical value being handled also can comprise:
Step S13 carries out the dual intensity resolution process to equidistance fan-beam projection numerical value, to obtain the dual intensity coefficient of dissociation of different substrate materials material.
Can adopt the sill decomposition method to decompose, decompose the dual intensity coefficient of dissociation A under the different substrate materials material equidistance fan-beam projection numerical value being carried out dual intensity
1And A
2
Step S14 utilizes filter back-projection algorithm that the dual intensity coefficient of dissociation of said different substrate materials material is carried out the dual intensity reconstruction, thereby obtains the image of inspection object.
Particularly, can be to dual intensity coefficient of dissociation A
1And A
2The method of rebuilding according to short scanning weighting is respectively carried out the CT reconstruction, thus dual intensity reconstructed coefficients a1 and a2 after obtaining to rebuild.
Used weighting coefficient can for:
Wherein, β is the pairing sampling angle of data for projection, and 2 γ are the maximum fan-angle of fan-ray beam.Certainly, the weighting coefficient of being selected for use is not limited to aforesaid way, also can adopt additive method to obtain weighting coefficient.
Preferably, this method also can comprise:
Step S15 judges whether the inspection object is suspicious object.
In this step, can be with dual intensity reconstructed coefficients a
1And a
2Following two formula of substitution are found the solution, to obtain the atomic number and the electron density of inspection object.
ρ
e＝a
1ρ
e1+a
2ρ
e2(2)，
Wherein, Z
1And Z
2Be respectively the atomic number numerical value of two kinds of sills, ρ
E1And ρ
E2Be respectively the electron density value of two kinds of sills.
Then, atomic number and the distribution value of electron density of inspection object are compared with the atomic number and the electron density distribution data of suspicious object, check with judgement whether object is suspicious object.The atomic number of suspicious object and electron density distribution can be stored in the database or be stored in other devices.
When in judging the inspection object, having suspicious object, execution in step S16.In step S16, can show the kind of suspicious object, and mark this suspicious object zone of living in, open the bag inspection by the staff.
When in judging the inspection object, not having suspicious object, execution in step S17.In step S17, order inspection object through and scanning one deck down, the examine object all through the time, can show the three-dimensional reconstruction image of this inspection object.
Utilize this method, can be to discerning fast and accurately such as dangerous suspicious object such as fire goods, explosive substance or drugs.
So far, the equipment and the method that are used for ray scanning imaging have been described in detail according to the utility model.For fear of the design of covering the utility model, details more known in the field are not described.Those skilled in the art can understand fully and how implement technical scheme disclosed herein according to top description.
Though specify through example some specific embodiments to the utility model, it should be appreciated by those skilled in the art that above example only is in order to describe, rather than in order to limit the scope of the utility model.It should be appreciated by those skilled in the art, can under the situation of scope that does not break away from the utility model and spirit, above embodiment be made amendment.The scope of the utility model is limited accompanying claims.
Claims (21)
1. one kind is used for the equipment that ray scanning forms images, and it is characterized in that this equipment comprises:
A plurality of ray generators, said a plurality of ray generators evenly distribute along circular arc, and in a scan period, said a plurality of ray generators send beam to the inspection object successively, to accomplish the scanning to a tomography;
Ray detecting device, said ray detecting device are used to gather the ray projection numerical value of the beam that said a plurality of ray generator sends.
2. equipment as claimed in claim 1 is characterized in that the central angle of the circular arc that said a plurality of ray generator constituted is at least π+2 γ, and wherein, 2 γ are the fan angle of the fan-ray beam that said ray generator sent.
3. equipment as claimed in claim 1 is characterized in that, each said ray generator comprises at least one ray emission unit.
4. equipment as claimed in claim 3 is characterized in that, said beam is fan-ray beam or the beam group for being made up of a plurality of parallel linear beams.
5. equipment as claimed in claim 1 is characterized in that, said ray detecting device is circular-arc ray detector array, and in this ray detector array, said a plurality of X-ray detection Xs unit evenly distributes along circular arc.
6. equipment as claimed in claim 1; It is characterized in that; Said ray detecting device comprises a plurality of ray detector linear arraies, and each said ray detector linear array is made up of a plurality of X-ray detection X unit along line spread, and said a plurality of ray detector linear arraies are positioned at same plane and connect successively through the end; And two ray detector linear arraies at two ends do not link to each other, to constitute semiclosed framework.
7. equipment as claimed in claim 6 is characterized in that,
When the number of said ray detector linear array greater than 3 the time, said a plurality of ray detector linear arraies are provided with according to following mode:
Adjacent two ray detector linear array angulations are greater than pi/2, and said a plurality of ray detector linear array can detect the beam that whole ray generator sends.
8. equipment as claimed in claim 6 is characterized in that,
When the number of said ray detector linear array was 3, said 3 ray detector linear arraies were provided with according to following mode:
The ray detector linear array that is positioned at both sides is all perpendicular with middle ray detector linear array, and said 3 ray detector linear arraies can detect the beam that whole ray generator sends.
9. equipment as claimed in claim 6 is characterized in that, said a plurality of ray detector linear arraies plane, place and said a plurality of ray generators place plane parallel, and this two plane is perpendicular with inspection motion of objects direction.
10. like claim 5 or 6 described equipment, it is characterized in that said equipment also comprises image-generating unit, the ray detection numerical value that this image-generating unit is gathered said ray detecting device is handled, to obtain the image of inspection object.
11. equipment as claimed in claim 10 is characterized in that,
For the ray detecting device that is made up of a plurality of ray detector linear arraies, the pairing a plurality of X-ray detection Xs of at least one ray generator unit does not form the perpendicular straight line in axis of the beam that is sent with this ray generator;
Said image-generating unit is directed against each in said at least one ray generator; Isometric type dummy detector linear array is set; Said isometric type dummy detector linear array comprises a plurality of along line spread and the virtual probe unit that is equally spaced; Each ray generator equates with the distance of corresponding isometric type dummy detector array
Said image-generating unit is according to the line of said ray generator and said X-ray detection X unit; Confirm and the corresponding X-ray detection X of said virtual probe unit unit; And, obtain the ray detection numerical value of this virtual probe unit based on the ray detection numerical value of this X-ray detection X unit
All the ray detection numerical value of isometric type dummy detector linear array constitutes equidistance fan-beam projection numerical value;
For the ray detecting device that is made up of circular-arc ray detector array, the ray detection numerical value that this device obtained constitutes equidistance fan-beam projection numerical value or collimated beam projection values.
12. equipment as claimed in claim 11 is characterized in that,
Said X-ray detection X unit is pseudo-dual intensity probe unit;
Said image-generating unit carries out the dual intensity resolution process to said equidistance fan-beam projection numerical value or collimated beam projection values; To obtain the dual intensity coefficient of dissociation of different substrate materials material; And utilize filter back-projection algorithm that the dual intensity coefficient of dissociation of said different substrate materials material is carried out the dual intensity reconstruction, thereby obtain the image of inspection object.
13. equipment as claimed in claim 12 is characterized in that, said equipment also comprises database, and said database is used to store the atomic number and the electron density of suspicious object;
The atomic number of the inspection object that said image-generating unit will be obtained in said dual intensity is rebuild and the data in electron density distribution and the said database are compared, to judge whether the inspection object is suspicious object.
14. an equipment that is used for the ray scanning imaging is characterized in that this equipment comprises:
A plurality of ray generators, said a plurality of ray generators evenly distribute along circular arc, and in a scan period, said a plurality of ray generators send beam to the inspection object simultaneously, to accomplish the scanning to a tomography;
Ray detecting device is used to gather the ray projection numerical value of the beam that said a plurality of ray generator sends.
15. equipment as claimed in claim 14 is characterized in that the central angle of the circular arc that said a plurality of ray generator constituted is at least π.
16. equipment as claimed in claim 14 is characterized in that, each said ray generator comprises a plurality of ray emission unit, and the beam that this a plurality of ray emission unit is launched is parallel line beam;
Said ray detecting device comprises a plurality of X-ray detection Xs unit, and pairing X-ray detection X unit, whole said ray emission unit is not overlapping.
17. equipment as claimed in claim 16; It is characterized in that; Said a plurality of X-ray detection Xs unit evenly distributes along circular arc, and said ray emission unit is corresponding one by one with said X-ray detection X unit, and the ray detection numerical value that whole said X-ray detection Xs unit is obtained constitutes the collimated beam projection values.
18. equipment as claimed in claim 17 is characterized in that, plane, place, said a plurality of X-ray detection Xs unit and said a plurality of ray generators place plane parallel, and this two plane is perpendicular with inspection motion of objects direction.
19. equipment as claimed in claim 14 is characterized in that, said equipment also comprises image-generating unit, and the ray detection numerical value that this image-generating unit is gathered said ray detecting device is handled, to obtain the image of inspection object.
20. equipment as claimed in claim 19 is characterized in that,
Said X-ray detection X unit is pseudo-dual intensity probe unit;
Said image-generating unit carries out the dual intensity resolution process to said collimated beam projection values; To obtain the dual intensity coefficient of dissociation of different substrate materials material; And utilize filter back-projection algorithm that the dual intensity coefficient of dissociation of said different substrate materials material is carried out the dual intensity reconstruction, thereby obtain the image of inspection object.
21. equipment as claimed in claim 20 is characterized in that, said equipment also comprises database, and said database is used to store the atomic number and the electron density of suspicious object;
The atomic number of the inspection object that said image-generating unit will be obtained in said dual intensity is rebuild and the data in electron density distribution and the said database are compared, to judge whether the inspection object is suspicious object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200855010U CN202562861U (en) | 2012-03-09 | 2012-03-09 | Device for radial scanning imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200855010U CN202562861U (en) | 2012-03-09 | 2012-03-09 | Device for radial scanning imaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202562861U true CN202562861U (en) | 2012-11-28 |
Family
ID=47212506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200855010U Expired - Lifetime CN202562861U (en) | 2012-03-09 | 2012-03-09 | Device for radial scanning imaging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202562861U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013131402A1 (en) * | 2012-03-09 | 2013-09-12 | 同方威视技术股份有限公司 | Device and method for ray scanning and imaging |
| CN103901486A (en) * | 2012-12-27 | 2014-07-02 | 同方威视技术股份有限公司 | Human body backscatter safety check system and method |
| CN109324071A (en) * | 2018-12-03 | 2019-02-12 | 平顶山天安煤业股份有限公司 | Aramid fiber conveying belt on-line measuring device is imaged based on grenz ray multi-angle in one kind |
| CN109607100A (en) * | 2018-12-03 | 2019-04-12 | 平顶山天安煤业股份有限公司 | A kind of aramid fiber conveying belt multi-angled shooting method |
| WO2023035770A1 (en) * | 2021-09-09 | 2023-03-16 | 同方威视技术股份有限公司 | Intelligent luggage item security inspection system and method |
-
2012
- 2012-03-09 CN CN2012200855010U patent/CN202562861U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013131402A1 (en) * | 2012-03-09 | 2013-09-12 | 同方威视技术股份有限公司 | Device and method for ray scanning and imaging |
| CN103308535A (en) * | 2012-03-09 | 2013-09-18 | 同方威视技术股份有限公司 | Apparatus and method for ray scanning imaging |
| CN103308535B (en) * | 2012-03-09 | 2016-04-13 | 同方威视技术股份有限公司 | For equipment and the method for ray scanning imaging |
| US9448325B2 (en) | 2012-03-09 | 2016-09-20 | Nutech Company Limited | Apparatus and method for ray scanning imaging |
| EP2713156B1 (en) * | 2012-03-09 | 2020-05-06 | Nuctech Company Limited | Device and method for ray scanning and imaging |
| CN103901486A (en) * | 2012-12-27 | 2014-07-02 | 同方威视技术股份有限公司 | Human body backscatter safety check system and method |
| CN109324071A (en) * | 2018-12-03 | 2019-02-12 | 平顶山天安煤业股份有限公司 | Aramid fiber conveying belt on-line measuring device is imaged based on grenz ray multi-angle in one kind |
| CN109607100A (en) * | 2018-12-03 | 2019-04-12 | 平顶山天安煤业股份有限公司 | A kind of aramid fiber conveying belt multi-angled shooting method |
| WO2023035770A1 (en) * | 2021-09-09 | 2023-03-16 | 同方威视技术股份有限公司 | Intelligent luggage item security inspection system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103308535B (en) | For equipment and the method for ray scanning imaging | |
| CN101071109B (en) | Multi-segment linear trace imaging cargo safety inspection system | |
| US7324625B2 (en) | Contraband detection systems using a large-angle cone beam CT system | |
| CN202562861U (en) | Device for radial scanning imaging | |
| CN103675931B (en) | CT system and the detection device for CT system | |
| CN101561405B (en) | Straight-line track scanning imaging system and method | |
| JP5350222B2 (en) | Multi-view angle luggage security inspection method | |
| CN100565336C (en) | Imaging system | |
| CN109343135B (en) | Multi-level energy type static security check CT system and imaging method | |
| CN107677693B (en) | Scanning imaging system for article safety inspection and imaging method thereof | |
| CN103901493A (en) | Rackless CT device | |
| CN105242322A (en) | Detector device, dual-energy CT system and detection method applying dual-energy CT system | |
| CN106164707A (en) | It is used in particular for method and the X ray detection system of the Non-Destructive Testing of object | |
| CN201242531Y (en) | Scanning imagery system for straight-line track | |
| US20140270054A1 (en) | Adaptive ct scanning system | |
| AU2023204307A1 (en) | Multi-energy static security ct system and imaging method | |
| CN212111830U (en) | Three-dimensional tomography imaging equipment | |
| US10215879B2 (en) | System for detecting counterfeit goods and method of operating the same | |
| CN111221049B (en) | Three-dimensional tomography imaging equipment | |
| CN201043954Y (en) | Goods safety-checking system for multistage straight-line track image-forming |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121128 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |