CN102893184B - Personnel's safe examination system - Google Patents

Abstract

This instructions relates to personnel's safe examination system further, comprises modular member, and this modular member comprises detecting device and source unit, wherein, have employed twin shaft scanning beam.In a structure, the object being in inspection keeps static, and is positioned between two scan modules.X-ray source component design becomes to make total system areal coverage minimum, still produces the resolution of the visual field of needs, Low emissivity exposure level and needs simultaneously.Modular member has can be dismantled so that transport and easily assemble for the compact, light of inspection and sufficiently solid general structure in the place needed again.

Description

Personnel's safe examination system

The cross reference of related application

This application claims the right of priority of No. 61/313772nd, the U.S. Provisional Patent Application submitted on March 14th, 2010, this application is here all incorporated to herein by reference.

This application claims the right of priority of No. 61/423585th, the U.S. Provisional Patent Application submitted on November 15th, 2010, this application is here all incorporated to herein by reference.

In addition, this application claims the right of priority of No. 61/423582nd, the U.S. Provisional Patent Application submitted on November 15th, 2010, this application is here all incorporated to herein by reference.

In addition, this application claims the right of priority of No. 61/423586th, the U.S. Provisional Patent Application submitted on November 15th, 2010, this application is here all incorporated to herein by reference.

And, to be denomination of invention be " Security System for Screening People " to the application and transfer the part continuation application of the U.S. Patent application 12/887510 of applicant of the present invention, this U.S. Patent application has identical denomination of invention, also transfer the continuation application of the U.S. Patent application 7826589 of applicant of the present invention, two patented claims are here all incorporated to herein all by reference.

And, to be denomination of invention be " Personnel Screening System with EnhancedPrivacy " to the application and transfer the part continuation application of the U.S. Patent application 12/849987 of applicant of the present invention, this U.S. Patent application has identical denomination of invention, also transfer the continuation application of the U.S. Patent application 7796733 of applicant of the present invention, two patented claims are here all incorporated to herein all by reference.

Technical field

This instructions relates generally to a kind of security system being included in the threat on the person for safety check, or rather, relates to a kind of personnel's safe examination system, comprise for improvement of the modular member of portability.

Background technology

For safety check crowd, be at present roughly entrance system (portal system) in the system based on radiation that such as transportation point such as airport, law court uses, it is heavy, is unfavorable for applying easily.It's a pity, the safe examination system of this prior art is compact not (such as, there is the heavy rear end cable or wire for photomultiplier and centralized analog to digital conversion and power house being coupled together), usually use and/or transport time be difficulty with consuming time.

In addition, the power limitations of current security system is in contraband goods, weapon, explosive and other dangerous goods of detection of concealed under clothes.Usual use metal detector and chemical sniffer detect large metal and the explosive of some type, but, there are the dangerous goods of the huge number that can not detect with these devices.Plastics and ceramic weapon add the type needing security personnel to remove the non-metal article detected; The alternative speed of manual seeking target is slow, inconvenient, and ordinary populace is not high to this tolerance, time particularly as standard program in huge traffic hub, such as on airport.

Be known in the art and X ray scattering can be used to produce the image of dissimilar material.The intensity of the X ray of scattering is relevant with making the atomic number of the material of X ray scattering (Z).Usually, for the atomic number being less than 25, along with atomic number increases, the intensity of backscattered X ray or X ray reflection are than reducing.First image is modulated by the variation of the atomic number of target subject.High Z materials presents special problem in personnel inspection, because be difficult to the background also with low Z distinguishing high Z materials and target subject.

The x-ray system for the article of detection of concealed on the person of known prior art has limitation in its design and method, this hinders x-ray system acquisition as the low radiation dose of health requirements, or hindering the high-quality image of generation, low radiation dose and high image quality are the commercial condition precedents that can accept.The check system operated under low-level radioactive exposure is limited to it and utilizes and obtain precision towards by a small amount of radiation of people's orientation of searching.X ray absorption and scattering also reduce the total amount of the useful X ray of the image forming people and any hiding article.In the system of prior art, the low ordinal number of the X ray of detection causes unacceptable bad picture quality.

If X-ray inspection system is used for open place, such as stadium, shopping mall, outdoor fair and exhibition etc., this problem can be more remarkable.In such place, people can be close to machine and/or have certain distance with machine.If just by the people scanned not very near X-ray machine, the image so obtained is just enough not clear, because very low to the radiation amount of intelligent.The sweep limit of system is restricted to several feet of places in distance machine front by this.But, if just by the people scanned from X-ray machine too close to, the radiation amount clashing into people can be dangerous.

In addition, what be configured in the airport of the U.S. (U.S.A) must observe the guide worked out by United States Transportation Security management board (TSA) for the X ray safe examination system performing automatic threat detection.Current TSA guidelines can scan the people of at least 6 feet 6 inches long from ancon to ancon, at least 6 feet of 6 inches long sweep lengths being converted at least 103 centimetres from ancon to ancon.In addition, consider the traffic congestion increased on airport, the safe examination system being configured in airport or other this handling capacity region must provide fast scan time, preferably often scans about 10 seconds.In addition, safe examination system should preferably be consistent with the law of control disabled person.In the U.S., safe examination system must be consistent with the regulations that Americans with disabilities act (ADA) proposes.

Therefore, it is desirable that a kind of compact ray detector/source safe examination system, it has the detection efficiency of improvement, is light but enough firm, and is easy to dismounting for transport, and easily assembles at place place again.

In addition, need a kind of safe examination system, its weight by means of modularization, less size, minimizing and assemble fast and be easy to configuration; And higher sweep speed (higher personnel's handling capacity) and nearest process electronic equipment are provided simultaneously.

Also need a kind of ray safe examination system, it provides good resolution and large-scale visual angle and rapid scanning speed, keeps radioactive exposure to be in safety margin simultaneously.That is, not only concerning being in, to connect in-plant people be safe to this system, and can also provide good resolution and penetrance at distant location.Especially, conventional system can not at distance check system preset distance place, with the sweep speed needed, the visual field (people of scanning predetermined altitude and width) exposing generation needs with accessible radiation, to produce acceptable level of resolution.

Summary of the invention

In one embodiment, subject description discloses a kind of check system for detecting the article just carried by static people, comprise the first detection system, be configured to detect the radiation scattered out from described people, described first detection system is configured to produce the electronic signal detected radiation being made to response; Second detection system, is configured to detect the radiation scattered out from described people, and described second detection system is configured to produce the electronic signal detected radiation being made to response; X-ray source, be positioned in the involution part between described first detection system and described second detection system, described x-ray source is connected to the chopper with diameter, and being configured to emitting x-ray through space described first detection system and described second detection system, described space is limited by the width in the scope of 1/2 to 2 times of chopper diameter; And disposal system, for analyzing the electronic signal produced by described first detection system and described second detection system, and produce image over the display.

Selectively, described chopper is wheel, and wherein said wheel has three slits, and each slit all orientates 120 degree as with contiguous slit.The described slit collimator slit parallel with at least two is aimed at, and the X ray launched from described x-ray source irradiates described collimator slit conically, to produce in time interleaved at least two parallel scanning beams.Described chopper comprises the hollow cylinder with at least one threaded hole.Described first detection system is contained in the first involution part, and described second detection system is positioned in the second involution part.Described first involution part physically separates with described second involution part, and independent of described second involution part.X-ray source involution part physically separates with described first involution part and described second involution part, and independent of described first involution part and described second involution part.Described first, second, and third involution part is all less than 88 pound weights.Described 3rd involution part is detachably connected to described first involution part and described second involution part.Described first, second, and third involution part is all detachably connected to framework.Described chopper comprises the disk chopper being configured to be rotated by motor.The speed of described chopper wheel is dynamically controlled by controller with the sweep velocity of optimization X-ray beam.

Selectively, described first involution part comprises the first side, is limited by the flat surfaces of the outer surface with interior surface and human oriented, and described first side is configured to receive the radiation scattered out from people; Second side, acutangulates relation with described first side, and described second side limits through the flat surfaces of the interior surface of the radiation of described first side by having to be suitable for receiving, and described second side is configured to only after being radiated through described first side, receive this radiation; First matrix, is positioned the interior surface of described first side, and described first matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation; Second matrix, is positioned the interior surface of described second side, and described second matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation; And at least one photoelectric detector, have photoresponse region and non-photoresponse region, described photoresponse region is located, to receive the light emitted from described first matrix and described second matrix.

Selectively, described radiation comprises x-ray photon, and described first matrix detects the x-ray photon of described first side of impact of 30%-60%.Described second matrix detects the 10%-30% of the x-ray photon impacting described first side.Described x-ray source is by being pivoted to second point from first and producing vertical bundle spot pattern, and described pivotable is felt relieved around the predetermined point of rotation.Described x-ray source and chopper are connected to and are configured to vertically tilt relative to induction element and motor are made to the plane of response.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with the counterweight being configured to make described x-ray source balance.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with at least one lifting belt.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with gear reducer and motor, and described elevating mechanism does not connect with counterweight.

In another embodiment, subject description discloses a kind of check system for detecting the article carried by the static people of width that there is the height that is equal to or less than 6 feet 8 inches and be equal to or less than 45 inches, comprise: the first detection system, be configured to detect the radiation scattered out from described people, described first detection system is configured to produce the electronic signal detected radiation being made to response; Second detection system, is configured to detect the radiation scattered out from described people, and described second detection system is configured to produce the electronic signal detected radiation being made to response; X-ray source, be positioned to have a surface and in involution part between described first detection system and described second detection system, described x-ray source is connected to chopper, and be configured to when described people be positioned at apart from the surface of described involution part be no more than 1 foot place time, produce can scan the height of described people and the visual field of width; And disposal system, for analyzing the electronic signal produced by described first detection system and described second detection system, and produce image over the display, described image has enough resolution visually to distinguish human body and explosive material.Enough resolution may be defined as the enough image resolution ratios allowing visual difference high Z materials and tissue, and high Z materials such as has the material of the effective atomic number being less than 8.Those image parameters that enough resolution also can be provided by the United States Patent (USP) 7110493 and 5181234 being incorporated to this paper by reference limit.

Selectively, described x-ray source is connected to wave beam chopper wheel, and described chopper wheel has three slits, and each slit is all orientated as and is separated by 120 degree with contiguous slit.The described slit collimator slit parallel with at least two is aimed at, and wherein, the X ray launched from described x-ray source irradiates described collimator slit conically, to produce in time interleaved at least two parallel scanning beams.Described x-ray source is connected to chopper, and described chopper comprises the hollow cylinder with at least one threaded hole.Described first detection system is contained in the first involution part, and described second detection system is contained in the second involution part.Described first involution part physically separates with described second involution part, and independent of described second involution part.Described x-ray source involution part physically separates with described first involution part and described second involution part, and independent of described first involution part and described second involution part.Described first, second, and third involution part is all less than 88 pound weights.Described 3rd involution part is detachably connected to described first involution part and described second involution part.Described first, second, and third involution part is all detachably connected to framework.Described chopper comprises the disk chopper being configured to be rotated by motor.The speed of described chopper wheel is dynamically controlled by controller with the sweep velocity of optimization X-ray beam.

Selectively, described first involution part comprises: the first side, is limited by the flat surfaces of the outer surface with interior surface and human oriented, and described first side is configured to receive the radiation scattered out from people; Second side, acutangulates relation with described first side, and described second side limits through the flat surfaces of the interior surface of the radiation of described first side by having to be suitable for receiving, and described second side is configured to only after being radiated through described first side, receive this radiation; First matrix, is positioned the interior surface of described first side, and described first matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation; Second matrix, is positioned the interior surface of described second side, and described second matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation; And at least one photoelectric detector, have photoresponse region and non-photoresponse region, described photoresponse region is located, to receive the light emitted from described first matrix and described second matrix.

Described radiation comprises x-ray photon, and described first matrix detects the x-ray photon of described first side of impact of 30%-60%.Described second matrix detects the 10%-30% of the x-ray photon impacting described first side.Described x-ray source is by being pivoted to second point from first and producing vertical bundle spot pattern, and described pivotable is felt relieved around the predetermined point of rotation.Described x-ray source and chopper are connected to and are configured to vertically tilt relative to induction element and motor are made to the plane of response.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with the counterweight being configured to make described x-ray source balance.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with at least one lifting belt.Described x-ray source connects with vertical elevating mechanism, and described elevating mechanism is connected to gear reducer and motor, and described elevating mechanism is not connected to counterweight.

In another embodiment, subject description discloses a kind of check system for detecting the article carried by the static people of width that there is the height that is equal to or less than 6 feet 8 inches and be equal to or less than 45 inches, comprise: the first detection system, be configured to detect the radiation scattered out from described people, described first detection system is configured to produce the electronic signal detected radiation being made to response; Second detection system, is configured to detect the radiation scattered out from described people, and described second detection system is configured to produce the electronic signal detected radiation being made to response; Radiation source, be positioned to have a surface and in involution part between described first detection system and described second detection system, described radiation source is connected to beam-forming device, and be configured to when the described people surface be positioned at apart from described involution part is no more than 1 foot of place, generation can scan the height of described people and the visual field of width, and be configured to further, being less than in 20 seconds the scanning completed described people, described people is exposed under the radiation being no more than 20 micro-rems simultaneously; And disposal system, for analyzing the electronic signal produced by described first detection system and described second detection system, and produce image over the display, described image has enough resolution visually to distinguish human body and explosive material.

In another embodiment, subject description discloses a kind of check system for detecting the article carried by the static people of width that there is the height that is equal to or less than 6 feet 8 inches and be equal to or less than 45 inches, comprise: the first detection system, be configured to detect the radiation scattered out from described people, described first detection system is configured to produce the electronic signal detected radiation being made to response; Second detection system, is configured to detect the radiation scattered out from described people, and described second detection system is configured to produce the electronic signal detected radiation being made to response; Radiation source, be positioned to have a surface and in involution part between described first detection system and described second detection system, described radiation source is connected to beam-forming device, and be configured to, when the described people surface be positioned at apart from described involution part is no more than 1 foot of place, produces and can scan the height of described people and the visual field of width; Controller, for controlling described radiation source to perform the scanning at least one times of described people within the time being no more than 20 seconds, and described people is exposed to be no more than 20 micro-rems radiation under; And disposal system, for analyzing the electronic signal produced by described first detection system and described second detection system, and produce image over the display, described image has enough resolution visually to distinguish human body and explosive material.

Selectively, described controller is configured to control described radiation source to perform the single pass of described people within the time being no more than 10 seconds.Described controller be configured to control described radiation source with described people is exposed to be no more than 5 micro-rems radiation under.Described radiation source be configured to when described people be positioned at be no more than 10 inches of places apart from the surface of described involution part time, produce the visual field can scanned and equal 6 feet 6 inches or less height and 40.5 inches or less width.Described controller is configured to control described radiation source to perform the single pass of described people within the time being no more than 10 seconds, described controller be configured to control described radiation source with described people is exposed to be no more than 5 micro-rems radiation under.

Accompanying drawing explanation

These and other feature of the present invention and advantage will be fully realized for various reasons, because when considered in conjunction with the accompanying drawings, by reference to detailed description below, they can become better understood, in accompanying drawing:

Fig. 1 illustrates that the exemplary X-ray backscatter system for safe examination system of the present invention constructs, and comprises detection system and tower;

Fig. 2 A illustrates multiple views of the detecting device tower of embodiments of the invention;

Fig. 2 B illustrates the exploded view of photomultiplier, installation sheet and signal processing card;

Fig. 2 C illustrates the exploded view subassembly of photomultiplier, installation sheet and signal processing card being wrapped in the structure in detecting device tower;

Fig. 2 D illustrates the photomultiplier assembly of the embodiment of the present invention;

Fig. 2 E illustrates the signal-processing board of the embodiment of the present invention;

Fig. 2 F is the wiring diagram be connected with signal-processing board by four photomultipliers;

Fig. 2 G illustrates the table 1 of the first group of bill of materials being included in the respective articles numbering marked in the view of Fig. 2 A to Fig. 2 F;

Fig. 2 H illustrates the table 2 of the second group of bill of materials being included in the respective articles numbering marked in the view of Fig. 2 A to Fig. 2 F;

Fig. 3 A is the schematic diagram of the unassembled and packaging constructed for the example modular X ray backscatter system of personnel's safe examination system of the present invention, and this X ray backscatter system structure comprises detection system and tower;

Fig. 3 B is the assembling schematic diagram of the example modular X ray backscatter system structure shown in Fig. 3 A;

Fig. 4 illustrates for ease of serving the detecting device tower pulled out from radiation housing close to the modular member of safe examination system of the present invention;

Fig. 5 A illustrates the top view of the exemplary modulation dish used in safe examination system of the present invention;

Fig. 5 B illustrates the exemplary disk chopper assembly of electromagnetic machine and the bearing with associating;

Fig. 5 C illustrates x-ray source according to an embodiment of the invention, to be connected to disk chopper;

Fig. 6 A illustrates the x-ray source be just combined with the chopper wheel in exemplary threat detection system, and " cam " mechanism of the inclination in the source of being connected to is also shown;

Fig. 6 B illustrates the stretch-out view of metal framework tilting cam mechanism 600, and the driving wheel contacted with cam arm is also shown, makes source can vertical movement;

Fig. 6 C illustrates the another kind of view of the module shown in Fig. 6 A, and the rotation platform that source and corresponding power supply are rotated also is shown;

Fig. 7 A is the mechanical schematic of the exemplary design of an embodiment of exemplary beams forming apparatus;

Fig. 7 B illustrates the exemplary beams forming apparatus with x-ray source;

Fig. 7 C is according to an embodiment, uses of the present inventionly to have the rotary roll chopper of single source and the mathematic(al) representation of the beam trajectory obtained;

Fig. 8 A illustrates an embodiment of the embodiment of safe examination system of the present invention, and wherein, the target being in inspection presents stationary position;

Fig. 8 B is the process flow diagram of the method for the stationary position embodiment that use safe examination system of the present invention is as shown in Figure 8 A shown;

Fig. 9 A illustrates another embodiment of the safe examination system of the present invention in use, and wherein, the target being in detection is passed by this system;

Fig. 9 B is the process flow diagram of walking the method for embodiment that use safe examination system of the present invention is as shown in Figure 9 A shown;

Figure 10 A is the image using the partitioning algorithm of one embodiment of the present of invention and obtain;

Figure 10 B is the image using the partitioning algorithm of one embodiment of the present of invention and obtain;

Figure 10 C is the close-up view of segmentation article, splits and obtain the image shown in Fig. 9 b that this close-up view obtains from using the partitioning algorithm of one embodiment of the present of invention;

Figure 11 A is the image using the partitioning algorithm of one embodiment of the present of invention and obtain;

Figure 11 B is the image using the partitioning algorithm of one embodiment of the present of invention and obtain;

Figure 12 illustrates the side view using tailored radiation source to carry out vertical scanning;

Figure 13 is the top view that the exemplary safety check apparatus that the present invention uses is shown.

Embodiment

This instructions relates to the personnel's safe examination system comprising modular member, and this modular member comprises detecting device and source unit.Modular member of the present invention allows to dismantle so that transport and easily needing place to assemble compact, light and sufficiently solid general construction for inspection again.The modular construction of the novelty of safe examination system of the present invention also allows modular member to assemble separately with Rapid fastener for assembling.Similarly, modular member is easy to dismantle so that service is close to the parts selected and/or for packing for transport subsequently.

This instructions or under individuality not being exposed to high radiation, and when retaining safety check process efficiency, for the method for the improvement at home place safety check individuality.Disclosed system has with individuality at a distance of the irrelevant biggest threat detection perform of the distance of safe examination system and image definition.Therefore, in one embodiment, the present invention is modularization imaging device, for detecting the hiding article carried by the human body being in inspection.

For in the X ray backscatter system of detection of concealed article, the pencil beam of X ray travels through at the body surface of just checked human body.Detected from the health scattering of target or the X ray of reflection by detecting device, such as, such as scintillater and photomultiplier combine.The signal obtained produced by X-ray detector subsequently for generation of target and the subject image of any hiding article of being carried by target, such as profile.

In one embodiment, the present invention includes the first module, this first module also comprises housing to surround radiation source and for guiding the collimator apparatus of radiation towards described human body, wherein, described housing comprises the first and second angled side.

In one embodiment, use be used for " body imaging " any can radiography form ray image, radiography is such as but be not limited to X ray scattering, infrared imaging, microwave imaging, RF imaging, radar imagery, holographic imaging, CT imaging and MRI.Any " body imaging " system with the possibility of display health details can be adopted.In one embodiment, the present invention can adopt the detectable radiation of any photoelectricity or any radiation source with light beam.

In one embodiment, the present invention includes the second module, this second module also comprises the first and second teardrop shape detecting device towers, and wherein, each described detecting device tower also comprises first, second, and third side region be connected to each other with an angle; And wherein, described first side region comprises towards being in the human body of inspection to detect the primary scintillator screen of the radiation scattered out from described human body, described second side region comprises secondary fluor screen, it is inner that described secondary fluor screen is positioned at each described tower, detect scatter out from described human body but when detected, be transmitted through the radiation of described primary scintillator screen.

In one embodiment, the present invention includes the multiple photomultiplier of the first and second covers, the multiple photomultiplier of described first and second cover is enclosed in each inside of described first and second detecting device towers, contiguous described 3rd side region is placed, and produces signal that be detected at described first and second scintillator screen places, that represent the intensity from the backscattered radiation of described human body.

In one embodiment, the present invention includes the 3rd module, the 3rd module also comprises the first and second roughly semicircular shells, to surround the back end electronics of the multiple photomultiplier of described first and second cover.

In one embodiment, the present invention includes front end band, this front end band by described first and second detecting device towers separately, and comprises limited opening to make being radiated through from described radiation source, and then clashes into described human body.

In one embodiment, the present invention includes processor, for the treatment of the signal from the multiple photomultiplier of described first and second cover, and produce image on the display apparatus.

In another embodiment, the present invention is the method using modularization imaging device to detect the hiding article carried by the human body being in inspection, the method comprises a step, operation is surrounded in the housing and is formed radiation source and the collimator apparatus of the first module, to guide radiation towards described human body, wherein, described housing comprises the first and second angled side, and in the second module, detect at primary scintillator screen place and detect from described human body backscattering out from described human body backscattering radiation out with at secondary fluor screen, but when not detected, be transmitted through the radiation of described primary scintillator screen, wherein, described second module comprises the first and second teardrop shape detecting device towers, and wherein, each described tower also comprises first, second, and third side region be connected to each other with an angle, and wherein, described first side region comprises the described primary scintillator screen towards described human body, and the second side region comprises described secondary fluor screen.

In one embodiment, the method also comprises a step, produce representative from described human body backscattering out, use each inside of being enclosed in described first and second detecting device towers and the signal of the intensity of radiation that detects at described first and second scintillator screens of the multiple photomultiplier of the first and second covers placed of contiguous described 3rd side region.

In one embodiment, the method also comprises a step, processes the signal from the multiple photomultiplier of described first and second cover, and produces image on the display apparatus; Wherein, the back end electronics of the multiple photomultiplier of described first and second cover are enclosed in first and second of formation the 3rd module roughly in semicircular shell; And front end band by described first and second detecting device towers separately, and comprise limited opening to make being radiated through from described radiation source, and then clash into described human body.

In one embodiment of the invention, the backscatter radiation of the shock described primary scintillator screen of 40% is detected by described primary scintillator screen, and the residue backscatter radiation of about 20% is detected by described secondary fluor screen.

In one embodiment, described collimator apparatus is chopper wheel.In one embodiment, described first and second detecting device towers by described front end band with the distance in the scope of 1/2 to 2 times of described chopper wheel diameter separately.

In one embodiment, described back end electronics comprises the first and second signal-processing boards of the multiple photomultiplier of contiguous described first and second cover, wherein, described first and second signal-processing boards are all provided with at least one analog-to-digital conversion card and power module separately.

In one embodiment, system of the present invention needs the target being in inspection only to present a posture, and this system uses the single source of detecting device, circuit and the processor with single group, to produce two scanning beams and associated picture processed separately.

In one embodiment, system of the present invention walks check system, and it uses the single source of detecting device, circuit and the processor with single group, to produce two scanning beams and associated picture processed separately.

In another embodiment, this system with double source mode operation, but uses detecting device, circuit and the processor of single group.

This system allow by the explosive material of such as trinitrotoluene, C-4 and pottery, graphite fiber, plastic containers, plastic weapons, vial, syringe, the anesthetic of packaging, the bank note of binding and even wooden object effectively imaging detect threat.

In one embodiment, X ray backscatter imaging system of the present invention is designed to its optimization for using inquiry radiation beam to the human body be in motion or the nearly imaging in real time of article.This system can also by the nearly threat in real time automatically in inspection image data of process detection algorithm.

The present invention relates to multiple embodiment.What provide below is open to enable persons skilled in the art realize the present invention.The language used in this manual should not be construed as totally denying any one specific embodiment, or should not be used for restriction claim exceed term implication as used herein.Without departing from the spirit and scope of the present invention, the General Principle defined here can be applied to other embodiment and application.Equally, the term of use and word are the objects in order to describe exemplary embodiment, and should not think restrictive.Therefore, the present invention is endowed the most wide region comprising many alternative, modification and the analog consistent with disclosed principle and feature.For the sake of clarity, the details relating to technologic material known in the technical field relevant with the present invention is not described in detail, with in order to not make the present invention fuzzy.

Fig. 1 illustrates that the exemplary X-ray backscatter system for the modularization safe examination system 100 of novelty of the present invention constructs.See Fig. 1, x-ray source 160 is contained in Modularized shell 165, and for generation of pointing to the narrow pencil beam 102 being in the X ray of the target 103 of inspection.

In one embodiment, pencil beam 102 is formed by the associating of X-ray tube and Duan Shu mechanism 167.Pencil beam 102 flatly or vertically rasterisation through target.The result that this rasterisation Shi Duanshu mechanism only allows X-ray beam to project with minimum outlet aperture.If employing chopper wheel, as described below, the diameter of outlet aperture is 1mm, causes the X-ray beam departing from about 7mm.In one embodiment, target 103 is mankind.When safe examination system is posed or passed by object (just by the people scanned) 103 before safe examination system 100, pencil beam 102 colliding object obtained, thus, X ray be reversed scattering at least partially.Be described in more detail below the exemplary embodiment of Duan Shu mechanism 167.

Persons skilled in the art should be understood that, can use the ionizing radiation source of any amount including but are not limited to: gamma radiation, electromagnetic radiation and ultraviolet radiation.Preferably, the X-ray energy of employing is between 30kV and 100kV.

In one embodiment, adopt sensor 104a and 104b with pose before safe examination system when him or she or pass by safe examination system time human body existence.

The detector means of shock at least partially 106 of scattered x-ray 105.In one embodiment, the detector means 106 in safe examination system of the present invention comprises the first and second detecting device involution parts 110 and 120 for making detection feasible.In one embodiment, the first and second detecting device involution parts 110 and 120 are presented as the form of modular radiation detector tower, comprise at least one scintillator screen.In another embodiment, the first and second detecting device involution parts 110 and 120 are the modular radiation detector towers comprising at least two detecting device screens.In alternate embodiments, detecting device involution part comprises the device of any amount, and the device of this any amount includes but are not limited to: multiple detecting device screen.Denomination of invention is " MultipleScreen Detection System ", transfer the U.S. Patent application 12/262631 of applicant of the present invention is here incorporated to herein by reference.In addition, the denomination of invention submitted on March 14th, 2010 is that the U.S. Patent application 62/313733 of " Multiple Screen Detection System " is here all incorporated to herein by reference.

As shown in Figure 1, detecting device tower 110 and 120 all comprises the first side region 141, second side region 142 and the 3rd side region 143 that couple together to be formed triangular-section each other with an angle separately.Described first side region 141 comprises screen 147, and towards being in the target 103 of inspection.Described second side region 142 comprises the second screen 148 being positioned at tower inside.In one embodiment, screen 147,148 is relatively thick CaWO ₄scintillator screen, this scintillator screen has the relatively short fall time of 10 microseconds, and this relatively short fall time allows radiation beam with minimum image degradation rapid scanning.In one embodiment, CaWO ₄screen can detect the backscattering of about 70% or the radiation of transmission, thus every 30keV X ray produces about 250 available optical photons.In addition, use thicker screen can with lower light output for cost and detect more incidence radiation on the detector.In one embodiment, the surface density of screen is 80 milligrams every square centimeter.

In one embodiment, in order to make detecting device tower be fastened to pedestal, large diameter rotator bolt pretension is affixed to pedestal, makes detecting device tower " to rotate " and to be locked on pedestal.Once radiation source and housing are connected to pedestal, detecting device tower just can not move and depart from (twisted off).Radiative envelope body region 165 comprises the first angled side 170 (angular side) and the second angled side 171, make when detecting device tower and radiation source housing combine or fit together, they are easy to the side 142 against detecting device tower 110 and 120, and consistent with the side 142 of detecting device tower 110 and 120.The front band 172 of object-oriented 103 comprises opening 173, and X-ray beam 102 passed this opening before shock target 103.Limited opening 173 helps to reduce electromagnetic interference (EMI) and radiated noise.Side slat band 172 also serves as the separation vessel for two detecting device towers, makes two detecting device towers be assembled in incident X-rays pencil beam 102 symmetrically around, to detect backscatter X-ray 105, and provides the electronic signal characteristics of X ray reflection ratio.

In one embodiment, detecting device tower 110 and 120 is separated by band 172, makes chopper wheel or other beam collimation device be positioned at the centre of two towers.Two towers 110,120 distance of separation " d ", this distance is in one embodiment in the scope of 1/2 to 2 times of chopper wheel diameter.Distance " d " defines the visual field for x-ray source, and optimizes for enough visual fields, prevents crossing of detecting device from exposing simultaneously.

According to one embodiment of present invention, detecting device tower 110,120 and radiation housing 165 have other the similar non-conductive materials any providing the composite wall of optimized firm but light general construction or those skilled in the art to understand.Exactly, radiation source and the back end electronics relevant with photomultiplier, electric wire and cable are contained in composite wall and create faraday cup, thus substantially reduce electromagnetic interference (EMI).

In an embodiment of the present invention, detecting device tower 110,120 also comprise be positioned at front area 141 periphery or any one edge on light-emitting device, such as light emitting diode, for throw light on instruction safe examination system start and/or safety check well afoot.The each of tower 110,120 comprises the photomultiplier 150 being placed on tower inside, next-door neighbour's the 3rd side region 143.The back end electronics of photomultiplier 150 is contained in roughly in semicircular shell 151.

Fig. 2 A to 2F illustrates the CONSTRUCTED SPECIFICATION of the detecting device tower of the present invention's specific embodiment.Fig. 2 G and 2H illustrates and numbers the relevant bill of materials with the respective articles marked in the view of Fig. 2 A to Fig. 2 F.Exactly, Fig. 2 A illustrates the skeleton view of equality detector tower 210 and 220 and their respective front view 205, top view 215 and side views 216.In one embodiment, tower has the maximum gauge ' t ' of the height ' h ' of 67 inches, the transverse width ' w ' of 30 inches and 16 inches.

Referring now to the exploded view of detecting device tower in Fig. 2 B and 2C, meanwhile, installation sheet 225 be shown as with four the photomultiplier assemblies 230 " disengaging " be arranged on when assembling on sheet 225 be separated.According to embodiments of the invention, the back end electronics of photomultiplier 230 comprises and being co-located on installation sheet 225 and the signal-processing board 235 contiguous with photomultiplier.Fig. 2 D provides the more detailed view of photomultiplier assembly 230, and Fig. 2 E illustrates the detailed view of signal-processing board 235 simultaneously, and in this enforcement, signal-processing board is the four-way card corresponding with four photomultipliers.

At least one analog-to-digital conversion card and a power module are arranged on signal-processing board 235.Operating voltage is applied to photomultiplier by power module, and meanwhile, the pulse current exported from photomultiplier is converted to the digital signal for processing further by analog-to-digital conversion card.Usually, adopt a large amount of cables to be coupled together from the central mould number converter of photomultiplier a distance and power house with being positioned at by photomultiplier.By making power supply and analog to digital converter closer to photomultiplier, the electric wire of needs is less, thus, also reduces signal transient noise, and improves total signal to noise ratio (S/N ratio) (SNR).Similarly, Fig. 2 F illustrates the connection of four photomultipliers 230 and signal-processing board 235.

Refer again to Fig. 2 B and 2C, meanwhile, seal 226 allows the subassembly comprising installation sheet 225, photomultiplier 230 and signal-processing board 235 to be closely installed into corresponding column foot portion 227.The structural cover protection of a set of mutual connection also allows when needed easily close to the photomultiplier be positioned on installation sheet assembly.This nested structure comprises the angle lid 240 with connector angle lid 241; There is the closing lid 245 of corresponding connectors 246; Two neat lateral plates 250 and top and bottom handle framework 255.

Return see Fig. 1, in one embodiment, check system 100 has modular member, and this modular member can be dismantled for moving and being easy to transport, and assembles in interested place again.Therefore, teardrop shape detecting device tower 110,120 and the radiation source housing 165 with relevant electronic equipment and cable manufacture the independent module or cabinet that can combine fast to form system 100.Novel teardrop shape modular construction makes compact and light total system 100 become possibility.

Fig. 3 A illustrates the dismounting view 300a of safe examination system of the present invention, and such as the modular member of detecting device tower 310,320 and radiation source housing 365 is dismantled and assembled and can packs, to be easy to transport.Such as, the triangular-section of detecting device tower 310,320 makes these parts pack to need the mode of minimum transport space against each other.Fig. 3 B illustrates the assembled view 300b of the safe examination system built according to the shipping parcel 300a of Fig. 3 A.The modular member of safe examination system of the present invention or cabinet are designed to them and have simple and tie point intuitively, than if secured to one another for rapid-assembling by means of snap-fastener.In one embodiment, assemble/configure from the transport of safe examination system, packed state the time that safe examination system needs to be less than 30 minutes.In one embodiment, assemble/configure from the transport of safe examination system, packed state the time that safe examination system needs about 15 minutes to 30 minutes.In one embodiment, depend on assembling/setup time the need of heating or cooling unit enter safe operating temperature to make unit.

Persons skilled in the art it should be understood that the modular member design of safe examination system of the present invention is also convenient to R and M.

Such as, Fig. 4 illustrates the assembling/configuration view 400 of safe examination system of the present invention, and detecting device tower 410 is pulled away from radiation housing 465, for close to housing 465 and/or the selectivity R and M for tower 410.

Return see Fig. 1, during operation, when target 103 pass by detecting device tower 110,120 or stand on detecting device tower 110,120 front time, a part of clashing into the pencil beam 102 of the X ray as ray 105 of target 103 is reversed scattering due to Compton scattering, and impacts the first shielding 147 be positioned on the front area 141 of detecting device tower.Although a part for scattered x-ray is detected by the first screen 147, the some parts of these rays, when not detected, be transmitted through the first screen 147, and impact the second screen 148 (at side 142 place) being positioned at detecting device tower inside.In one embodiment, the x-ray photon of impact first screen 147 of about 40% is detected by the first screen, and the residue x-ray photon of about 24% is detected by the second screen 148.It should be noted that these number percents change according to the thickness of the energy of X ray and scintillator screen.

Photomultiplier 150 produces the electronic signal to the ray response detected, and the ray of this detection is converted into light at first.Light bounce-back around triangle involution part/tower 110,120 of being launched by the flicker on screen 147,148, until caught by photomultiplier 150.

The electronic signal produced by two detecting device towers 110,120 is directed to processor.The signal that this processor analysis receives, and produce image on the display apparatus.The intensity of the every bit on the image of display is with when wave beam rasterisation is by target, and the relative intensity of the scattered x-ray of detection is corresponding.In one embodiment, synchronizing signal is sent to processor by x-ray source 160.The signal that processor analysis detects, and itself and synchronizing signal are compared, to determine to show image.In one embodiment, display device is monitor, and for showing by the image of processor signal.Display device can be any display of knowing altogether of this area or monitor, comprises CRT monitor, LCD monitors or light emitting diode monitor.In one embodiment, the digitized dispersion image shown by display device is preferably 480 row × 160 row, and every pixel is 8.Be described in more detail below image processing techniques.

As mentioned above, only allowing the Duan Shu mechanism that projects with minimum outlet aperture of X-ray beam by adopting, making pencil beam 102 flatly or vertically raster type scans (rastered) in target.In one embodiment, Duan Shu mechanism is the chopper wheel with three slits, described three slits are mutually positioning is 120 degree, and the collimator slit parallel with two is aimed at, make each chopper slit while leaving one of parallel collimator slit, another just in time enters relative parallel slits.This generates two parallel scanning beams, described two parallel scanning beam in time staggered scannings, and, even when all use conical irradiate the single source of two parallel slits single shared detector array, circuit and process, described two parallel scanning beams can be processed individually.

Fig. 5 A illustrates the top view of exemplary modulation dish 500, and this chopper wheel can be used for using single source to obtain Double-visual angle (using two parallel, interleaved scanning beams).Chopper wheel 500 has each other with three slits 501a, 501b and 501c that the angular distance of 120 degree is placed.Also have two parallel collimator slit 502a and 502b.Arrow 503 represents the direction of motion of chopper wheel, is clockwise in this embodiment.This layout generation two " stagger arrangement " parallel sweep wave beams, as discussed previously, this parallel sweep wave beam in time staggered scanning, therefore, it is possible to use common detecting device, circuit and processing element to process this two parallel sweep wave beams respectively.

In one embodiment, use electromagnetic machine driver dynamically to control disk chopper assembly to rotate.Fig. 5 B illustrates the disk chopper assembly with the electromagnetic machine of associating and the exemplary of bearing.See Fig. 5 B, disk chopper 501 is connected to radiation source 502, and in one embodiment, this radiation source comprises X-ray tube.Electromagnetic machine 503 is combined with X-ray tube 502 and chopper 501.Electric machine assembly also comprises three pressurized bearings 504 and the V-groove 505 for belt gear support section.

In one embodiment, described radiation source comprises the X-ray tube preferably controlled by X-ray controller.There is provided two cooling fans to disperse the heat produced around X-ray tube.X-ray source is connected to disk chopper.There is provided chopper motor to realize the rotation of chopper wheel.Chopper motor is controlled by controller unit, and this controller unit is also equipped with suitable power supply.Alternating current for whole detecting unit distributes and DC power supply is placed on the bottom of involution part.Fig. 5 C illustrates the X-ray tube (source) 501 being connected to disk chopper 502, eliminates electric machine assembly.

In one embodiment, X-ray inspection system also comprises parametric detector, and this parametric detector makes up and monitor each launching beam, and serves as the radiological monitor for monitoring the emitted radiation in inspection area further.In one embodiment, this parametric detector is positioned in the light path before the disconnected beam device of such as chopper disk.When starting to form sweep trace, after this parametric detector also can be positioned the disconnected beam device of such as chopper disk.In this case, can accept ground, radiation detector stops first of wave beam twice.

Fig. 6 A illustrates in exemplary threat detection system, the x-ray source be combined with the chopper wheel as described in Fig. 5 A, 5B and 5C.Described source and chopper wheel are connected to " cam " mechanism of inclination, and make in the vertical movement process of X-ray beam, the space between sweep trace is roughly equal.See Fig. 6 A, module comprises the cam mechanism 602 of the inclination connected with x-ray source assembly 610, and the cam mechanism of x-ray source assembly and inclination is contained on framework 620.The cam mechanism 602 tilted also comprises cam guide 604.In addition, motor is also contained on framework 620, for driving the cam mechanism and belt that can promote described source.In one embodiment, handle is connected to source component 610, for source component being matched metal cam guiding frame 604 and removing source component from metal cam guiding frame 604.In various embodiments, all parts of source component all pass through to use the nut of preliminary dimension, screw and clamp and are connected securely.In addition, provide belt elevator 606 to promote and to balance described source further.

Fig. 6 B illustrates the stretch-out view of tilting cam mechanism 602, the driving wheel 640 abutted also is shown, enables source vertical movement with cam arm 642.

In another embodiment, adopt counterweight to make source balance and to reduce the pressure on lifting motor.In another embodiment, adopt two belt elevators to balance described source, which eliminate counter poise, and obtain lighter source.In another embodiment, the motor of gear reducer (reduce at 15: 1) and more high torque can be adopted, to eliminate the counter poise of use, because it is 1/15th of motor weight that present described source looks.But in this case, motor must rotate with 15 speeds, to obtain identical radiation pattern.

Return see Fig. 6 A, the disc wheel cutting mechanism 614 that source component 610 comprises x-ray source 612 and is made up of the suitable material of such as metal or plastics, this disc wheel cutting mechanism is used for guiding the X ray 616 produced by x-ray source in a desired direction.In one embodiment, source component 610 also comprises the high-voltage power supply that source component is operated.In an embodiment, x-ray source 612 produces the narrow pencil beam of X ray together with Duan Shu mechanism 614, and the narrow pencil beam of this X ray points to the target being in inspection, rotated by source or wave beam traversal to produce sweep trace.In one embodiment, disc wheel cutting mechanism 614 selectively connects with cooling fin, and this cooling fin dissipates by the heat of the chopper wheel generation rotated.Fig. 6 C illustrates another view of the module shown in Fig. 6 A, and rotation platform 650 is also shown, to make source and corresponding power supply rotate, and then increases the visual field obtained, as composition graphs 13 below in detail as described in.

Persons skilled in the art should be appreciated that radiation source is usually very heavy.In order to hold the weight of x-ray source, as above adopted chopper wheel structure must be quite large, because this increasing the general assembly (TW) of system.Therefore, in another embodiment, safe examination system of the present invention is equipped with rotary roll chopper, and this rotary roll chopper is designed to present the spiral profile aperture blocking device for X-ray beam scanner, and is that light weight configures with being easy to.In addition, the use of rotary roll chopper eliminates necessity of source rotation, but wave beam is from-45 degree to+45 degree traversals.

In one embodiment, rotary roll chopper allows by revising the physical characteristics of chopper devices or geometric configuration and changes speed and beam spot size.In addition, rotary roll chopper provides has constant size and the bundle spot of the vertical movement of speed, to allow lighting object equably, and produces wider visual field during operation.

Fig. 7 A illustrates the exemplary design of an embodiment for rotary roll chopper, as used in different embodiments of the invention.In one embodiment, chopper 702 is to have the form manufacture of the hollow cylinder of spiral chopper slit 704.The cylindrical chopper 702 that makes can rotate around Z axis together with threaded hole 704, produces rotary roll motion.

Therefore, adopt the X-ray beam scanner of rotary roll chopper of the present invention to realize disconnected bundle by the hollow cylinder 702 that whirler is processed with at least two spiral slit 704, this makes X ray with constant with variable linear sweep wave beam speed and sewwp beam spot size scanning.Rotary roll chopper, by handling the geometric configuration of threaded hole, obtains constant and variable linear sweep wave beam speed.In one embodiment, by along rotary roll chopper length handle threaded hole gradient (pitch) and the angle of roll (roll) changes speed or maintenance speed is constant.Therefore, likely there is constant speed or reduce sweep velocity towards the more high-resolution region of needs.

Rotary roll chopper also obtains variable with constant beam spot size by the geometric configuration handling threaded hole, therefore changes the beam power obtained.In one embodiment, likely handle the developed width in aperture, to change beam spot size.In one embodiment, the width of threaded hole changes along the cylindrical length of rotary roll chopper, with the variable range at the center of compensate opening footpath distance sources, and allows along sweep trace projection fibers spot equably.Therefore, in one embodiment, aperture distance sources is far away, and the width of threaded hole is narrower, to produce less beam spot size.In one embodiment, aperture distance sources is nearer, and threaded hole is wider, to produce larger beam spot size.

Time in for body scan data system, likely change the gradient of threaded hole and the angle of roll and width, make more beam scanning power point to the body region (hair, pin etc.) needing more details and resolution, less power points to the body region (upper abdomen etc.) more responsive to radiation.

Spiral slit 704 also guarantees that the projection of X-ray beam is not limited by the dual collimation of two slits.Discussed in more detail below, dual collimation refers to X-ray beam at set point in time by the theory of two spiral slit.The X-ray beam track 730 obtained is also shown in Fig. 7 A, describes in more detail below in conjunction with Fig. 7 C.

In an embodiment of the present invention, the spiral slit by rotary roll chopper obtains at 60 degree to the multiple field angle within the scope of 90 degree.In one embodiment, scan angle is the function of the spacing of rotary roll chopper and source and target.In addition, the general assembly (TW) of rotary roll chopper and diameter affect field angle.Rotary roll chopper from source more close to, the rotary roll chopper of needs is less, similarly, rotary roll chopper from source more away from, the rotary roll chopper of needs is larger.

Fig. 7 B illustrates the Duan Shu mechanism of the rotary roll chopper used described in Fig. 7 A.See Fig. 7 B, cylindrical rotary roll chopper 752 is placed on radiation source 754 front, and in one embodiment, this radiation source comprises X-ray tube.In one embodiment, being rotated through the suitable motor 758 that comprises such as electromagnetic machine and promoting of chopper 752.In another embodiment, described in more detail as follows, adopt magnetic bearing so that rotary roll chopper of the present invention in rotary moving.The speed that rotary roll chopper rotates or rotating speed are controlled dynamically to optimize sweep velocity.In one embodiment, rotary roll chopper system can obtain the speed up to 80K RPM.

In one embodiment, radiation shield is arranged on radiation source 754, makes the fan-shaped beam only producing radiation from source.The fan-shaped beam of radiation launches X ray, and through serving as the rotary roll chopper of active shutter.Therefore, when rotary roll chopper and threaded hole rotate, only there is the little opening that the flying spot wave beam of movement is provided.

Fig. 7 B also illustrates disk chopper wheel 760, and it is arranged on source together with rotary roll chopper.As can be seen from Fig. 7 B, chopper wheel 760 is larger than rotary roll chopper 752 haply.

According to embodiments of the invention, in a distance from beam center, wide than other position of spiral slit (rotary roll chopper) maintenance.Fig. 7 C illustrates according to an embodiment, the mathematic(al) representation of the beam trajectory 770 using single source to obtain.In order to obtain the size of helical cuts on rotary roll right cylinder, remove a dimension (dimension) of this track.Or rather, slit is narrower at top 755, because have longer distance to go to advance at top wave beam.It is noted that when X ray wave beam is advanced through any opening, wave beam is collimated.It is far away that wave beam is advanced, and " spot " (fan-shaped beam) obtained is wider in the end of wave beam.By making slit narrow at top 755 place, solving this longer Distance geometry wave beam and widening.In addition, distance object is nearer, and such as at point 780 place, slit is wider.In addition, persons skilled in the art it should be understood that the size by controlling slit, can control the density of the wave beam of straight projection.

The denomination of invention submitted on March 14th, 2010 is that No. 61/313772nd, the U.S. Provisional Patent Application of " Walk-Through People ScreeningSystem " and children's application accordingly thereof are all incorporated to herein by reference.

It is directly related with minimum scanning height with the distance of object that system of the present invention is designed to Duan Shu mechanism.This allows source longer to the distance of object, thus, extends the depth of field relative to the dose rate arriving object.Therefore, for given imaging depth, compared with other system known in the art, system of the present invention needs less radiation dose.

In an embodiment, this safe examination system is based on X ray backscatter methods.For in the X ray backscatter system of detection of concealed article, the pencil beam of X ray travels through on the surface of just checked target subject.Detected from the X ray of target subject scattering or reflection by the detecting device that such as scintillator and photomultiplier combine.Then, the signal obtained produced by X-ray detector for generation of target and the subject image of any hiding article of being carried by target, such as profile.The design of X ray backscatter imaging system of the present invention is optimized for and uses inquiry radiation beam to come human body or the nearly imaging in real time of article.This system can also by means of the nearly threat in real time automatically in inspection image data of process detection algorithm.

In a first embodiment, X ray safe examination system of the present invention is embodied as fixed safe examination system, wherein, requires that just checked people rests on preposition, and presents the attitude that can scan.

In a second embodiment, X ray safe examination system of the present invention is embodied as traveling type system, wherein, requires that just checked people passes by while this system and is scanned.

In order to obtain the 2D image of scattered radiation, detector system uses twin shaft scanning beam.

Embodiment 1

Fig. 8 A illustrates the first embodiment of the embodiment of safe examination system of the present invention, and wherein, the target being in inspection presents stationary position.Therefore, in an embodiment, X ray safe examination system of the present invention is embodied as fixed safe examination system.Fig. 8 A illustrates the exemplary design of the stationary posture embodiment of safe examination system of the present invention.This safe examination system 800 comprises the first scan-side 802, second scan-side 804 and operator stands 806.Just be presented at by the ray image of the people 808 scanned and be arranged at operator and stand on the screen 810 at 806 places.

Each scan-side comprises at least one radiation source and multiple detecting device (not shown).

In one embodiment, safe examination system of the present invention selectively comprises shoes scanner.Therefore, in one embodiment, shoes scanner is incorporated to safe examination system of the present invention.Different shoes scanners uses in conjunction with safe examination system of the present invention.

The invention exercise question transferring applicant of the present invention is that the U.S. Patent application 12/948738 of " X-Ray Based System and Methodsfor Inspecting a Person ' s Shoes for Aviation Security Threats " is all incorporated to herein by introducing.

In one embodiment, two scan-side 102 and 104 are coupled together by the flat or arch top forming arched door at top section.

Fig. 8 B is the process flow diagram of the method for the stationary position embodiment that use safe examination system of the present invention is as shown in Figure 8 A shown.See Fig. 8 A and 8B, in step 801, just come into the inspection area limited by two scan modules 802 and 804 by the first man scanned, as described in Fig. 8 A.

Return see Fig. 8 B, in step 822, people stops and rotates towards side.In step 824, his/her hand is placed forward by people, simultaneously finger contact head.In step 824, just by the posture of people that scans as shown in 808 of Fig. 8 A.

In step 826, people keeps this posture about 6 seconds, and scanning process occurs simultaneously.

In step 828, first man leaves safe examination system 800, and moves to retaining zone, is presented at the screen for analyzing for the health of human body and automatic target detection (ATR) result of optional shoes simultaneously.Selectively, in step 828, the next man to be scanned enters the inspection area limited by two scan modules 802 and 804.

In step 830, determine whether first man does not have suspicion, and namely whether the scan image of first man does not show threat article.If first man does not have suspicion, he/her leaves retaining zone in step 832.If first man has suspicion, in step 834, he/her is accompanied further checks.

In an alternate embodiment of the invention, the instruction by means of laser projection system to just being provided scan instruction by the people scanned, such as entering, rotating to side, raise one's hand etc.In an embodiment, laser projection system embeds the top of safe examination system 800, and at side 802 or 804 place's idsplay order during scanning process.In an embodiment, laser projection system is designed to idsplay order, status information, advertisement or any other and is positioned at data on the wall of scan module 802,804, and therefore during scanning process, the information of display aligns can see by the people scanned.

In another embodiment, in safe examination system 800, use video analysis, with the attitude prior to scanning and estimate in scan period people.Video analysis can be implemented to comprise infrared and various forms of optical detections that are visible ray, to determine the shape of a) individual attitude, what b) store in the shape of more individual attitude and storehouse multiplely accepts shape, if c) shape of individual attitude can not mate multiple at least one of shape of accepting, produce the signal being in error span based on described comparison, and d) provide warning, instruction or other instruction, to point out individual to revise his or her attitude, thus form acceptable shape.

Embodiment 2

In another embodiment, X ray safe examination system of the present invention is embodied as traveling type system, wherein, requires that just checked people passes by this system.In another embodiment of the present invention, as Fig. 9 A more in detail shown in, adopt single axle scanning beam, object is passed by this single axle scanning beam.The walking movement of object provides the second axle of motion.Therefore, fixing vertical scanning wave beam forms an axle of motion, and the set goal is by passing by or being transmitted through the second axle that vertical scanning wave beam provides motion.Wave beam orientation can be used for vertical movement, to allow less opening and best detecting device location, as mentioned above.

Returning see Fig. 1, passing through any given time of the pencil X-ray bundle 102 of vertically movement in the target 103 or object move that are in inspection, by controlling the exact position (described in more detail as follows) of the known wave beam of motor of chopper wheel.In each moment, detector means 106 provides the measurement of backscatter X-ray to respond, and its intensity is presented in the image obtained.Because this system knows the position of pencil beam in each moment of detection backscattering ray definitely, so image can " be sewed up " together, to form the complicated image of object.

In one embodiment, fixing vertical scanning wave beam forms an axle of motion, and the set goal provides the second axle of motion by walking or be transmitted through vertical scanning beam.This structure is favourable, because single axle wave beam requires the very little rectangular aperture be positioned on detecting device panel.In the current backscatter detection system utilizing twin shaft scanning beam, mechanical component requires the significant through opening between detecting device, leaves to allow scanning beam.Why need significant opening, because for twin shaft scanning beam system, when object is static (chopper wheel of rotation provides an axle of motion, and the vertical movement of the chopper wheel of this rotation provides the second axle of motion), the pencil beam projection of X ray in the horizontal direction.Therefore, in order to cover the size of human object, opening must be wider to allow the whole human body of wave cover.In addition, conventional large scale opening allows the major part of backscatter radiation not detected and escapes.

Single axle scanning system of the present invention incorporates the little rectangular aperture 172 between detector region 110 and 120, to make X ray from wherein penetrating.And little opening 172 makes extra and/or larger detecting device panel be positioned in direct specular scattering path to become possibility, thus improves picture quality.

Fig. 9 A illustrates an embodiment of safe examination system of the present invention, and in use, the target being in inspection is passed by this system.See Fig. 9 A, each scan-side 910 and the second scan-side 920 are for generation of inspection area, and individuality to be scanned is passed by inspection area.This first scan-side 910 comprises two detecting device panel towers 911 and 912.In one embodiment, X ray involution part 913 is also close to the first scan-side 910.Second scan-side 920 is positioned the one side relative with the first scan-side 910 on walkway, thus forms inspection area or volume 940.Second scan-side 920 comprises two detecting device panel towers 921 and 922.Second X ray involution part is close to the second scan-side 920.

The screen 960 of operator also separately presents except full figure draws front elevation except 956 and rear view 952 and 954.And, walk in device such, by making a few individual queue up to pass by inspection area and these people of safety check rapidly.In exemplary application, the screen 960 of operator also shows front image from the queue of three people and rear image 952 and 954.

Fig. 9 B is the process flow diagram of walking the method for embodiment that use safe examination system of the present invention is as shown in Figure 9 A shown, the method composition graphs 9B discusses.

In step 970, just to be passed by the inspection area limited by two scan-side 910 and 920 by the first man scanned, as shown in Figure 9 A.In one embodiment, just to be transmitted by the passage of movement by the people scanned or surveyed area is passed through in movement.

In step 972, when target 930 passes by this system, the first scan-side and the second scan-side scanning target, with the image of the front LOOK LEFT and rear LOOK RIGHT that obtain people.In one embodiment, the first scan-side 910 and the second scan-side 920 sequentially scan target with minimum time delay between scanning.Therefore, target 930 does not need to rotate to scan or stop; When people passes by inspection area 940, complete image can be produced simply.

In step 974, first man leaves safe examination system 900, and moves to retaining zone, is presented at the operator's screen for analyzing for automatic target detection (ATR) result of human body simultaneously, and the generation image obtained is stood operator and 850 to be checked.Since comprise the scan-side of source and detector array for imaging, the image so produced by each scan-side also can be checked individually.

This external step 974, the next man to be scanned passes by the inspection area limited by two scan modules.

In step 976, determine that whether first man is pure, namely whether the scan image of first man does not show threat article.If first man is pure, he/her leaves retaining zone in step 978.If first man has suspicion, in step 980, he/her is accompanied further checks.

The novel designs of this transit system makes it possible to utilize low-level radiation dose to detect weapon and hazardous material, and no matter whether they comprise metal, high Z or high Z materials.Radiation dose be in be less than 20 micro-rems scope in, be preferably less than 10 micro-rems, be more preferably less than 5 micro-rems, and be even more preferably less than 1 micro-rem.This inlet configuration, compared with conventional system, can hold the crowd of high-throughput, because just only to be passed by entrance by everyone of safety check.And, just do not needed to stop and rotate his or her health according to the such of scanner system operator guidance by the people of safety check.In addition, when the inlet configuration using this object to pass by, the region relatively limited according to it, more easily with comprise metal detector, medicine and blast sniffer and video camera other walk device and be combined.

Should be appreciated that, check system can to human body (being included in clothes or under clothes) with metal and non-metal article (comprise blast and non-metallic weapons) imaging, and do not need to remove clothes, and the image of generation can be processed, only to show body contour, and highlightedly comprise the threat of organic or inorganic material or illegal article, cover private physical trait simultaneously, thus produce privacy image (privacyimage).This check system can be configured to operator only can use privacy image.Or it is default image that this system can be configured to privacy image, and the original image produced prior to the process that only shows body contour and threat or illegal article still can be used by operator.

In various embodiments, safe examination system of the present invention provides the image resolution ratio of improvement, obtains better graphical analysis.In an embodiment, the focus by reducing the one or more X-ray tubes generations adopted by safe examination system obtains the image resolution ratio of improvement.Less focus causes producing image with the picture quality of less resolution and improvement.In addition, resolution less in image allows the edge of detected image, such as but be not limited to the edge of a knife.In an embodiment, change one or more X-ray tube, to obtain less focus.If the power of X-ray tube is reduced to 70kV from 140kV, focal spot size reduces to 0.8mm × 0.8mm from 1.5mm × 1.5mm.Since X-ray tube does not require that power up to 140kV is to meet the operation of safe examination system, so reduce power and can cause obtaining at least equally good with 20 standard liness image resolution ratio.

The image analysis algorithm that the present invention adopts also helps quick security check, because it produces image usually need the time being less than 1 second.The image processing software of detection system of the present invention uses suitable algorithm with reconstructed image, such as by independent front image and rear image combining to produce complete image, and for graphical analysis to determine to threaten.In one embodiment, partitioning algorithm is for distinguishing threat article.Figure 10 A to 10C illustrates the example using partitioning algorithm.See Figure 10 A, image 1001 shows people's (harmless target) that health does not carry threat.In fig. 1 ob, the people of knapsack 1003 is carried in image 1002 display.In order to determine whether knapsack threatens, software application partitioning algorithm to be split from image 1002 by knapsack 1003, and produces independent image 1004, as illustrated in figure 10 c.Then, the dimension of object of the object of segmentation and image pixel intensities are for identifying threat.

Partitioning algorithm is also for distinguishing the dark object under white background.This feature contributes to identifying the threat comprising absorbing material exactly, such as steel edge and rifle and Stupalox.Figure 11 a and 11b illustrates the example of this feature using partitioning algorithm.See Figure 11 a, just the individuality 1104 of safety check is being detected three possible threat article 1101,1102 and 1103.In Figure 11 b, just the individuality 1107 of safety check is detected that two threaten article 1105,1106.In Figure 11 a and 11b, there is the identical algorithms of identical parameters setting for imaging.It will be appreciated by those skilled in the art that from these images, the image analysis algorithm that detection system of the present invention uses is very insensitive to background level.This is because background calculates from original image itself, and any possible threat is all highlighted.Persons skilled in the art it should be understood that as shown in figures 1 la and 1 lb, and individual health only occupies the regional area of image.The balance of image is considered to Background X-ray scattered signal.With average or part filter (averaging at regional area) equally simple computing method the accurate measured value of level of background signal is provided.

Usually, in order to detection of concealed is just by the metal on the health of target that scans, electronic metal detector (EMD) uses with X ray safe examination system is collaborative, additionally uses Data fusion technique.But safe examination system of the present invention provides the innovative techniques of " initiatively background " by name.In this safe examination system, initiatively background technology utilizes at X ray backscattering scan period usual no relative group of detecting device.By using this technology, being just captured at relative detecting device place by the X ray that the target scanned is passed, being easier to identify in vitro (off-the-body) inorganic material.Initiatively background image is by processing backscatter image and identical automatic threat detection (ATR) algorithm producing single integrated result utilizes.

The United States Patent (USP) 6094472,6665373 and 7110493 transferring applicant of the present invention is here all incorporated to herein by reference.

The invention exercise question transferring applicant of the present invention is that the U.S. Patent application 12/887510 of " Security system for ScreeningPeople " is here all incorporated to herein by reference with the United States Patent (USP) 7826589 with same title.

The invention exercise question transferring applicant of the present invention is that the U.S. Patent application 12/849987 of " Personnel Screening System withEnhanced Privacy " is here all incorporated to herein by reference with the United States Patent (USP) 7796733 with same title.

In addition, the invention exercise question transferring applicant of the present invention is that the United States Patent (USP) 7418077 and 7660388 of " Integrated Carry-OnBaggage Cart and Passenger Screening Station " is here also all incorporated to herein by reference.

In embodiments, due to multiple factor, safe examination system of the present invention provides better signal to noise ratio (S/N ratio) (SNR).First, system of the present invention has wider visual field.Field stereo angle is divided by just checked people.In one embodiment, the total amount of the solid angle covered by detecting device is come quantitatively by limiting solid angle relative to the ad-hoc location (leaving the height on ground) on human body, and the number percent of the solid angle covered by detecting device is also quantitative like this.

In an embodiment, by the space between two scan-side reducing X ray safe examination system of the present invention, operation areal coverage is reduced to minimum.In an embodiment, the size of safe examination system of the present invention is 6.5 feet long, and 7 feet wide.As known in the art, the angular region of the X-ray beam when visual field of X-ray beam leaves x-ray source by X-ray beam and passes collimating apparatus determines.The chopper wheel collimating apparatus of uniqueness provided by the invention makes the X ray wave beam of generation have wider visual field.It is the human body of 6 feet 6 inches long that wide visual field makes at least can scan from arm to arm, and this distance of 6 feet 6 inches long is generally 103 centimetres.In the conventional system, visual field is generally 54 degree, and this visual field is enough not wide, and can not allow so wide scanning, usually only covers 18 centimetres.In addition, in conventional safe examination system, in order to increase visual field to allow wider scanning, x-ray source must be increased pro rata and just by the distance between the object that scans, thus add the operation areal coverage of this system.

Safe examination system of the present invention provides the visual field of at least 103 centimetres wide, is simultaneously just still arranged in the x-ray source that adopts with system at a distance of the only distance of 36 inches by the people scanned.Therefore, safe examination system of the present invention is more elongated, has the areal coverage less than prior art systems.More broadly can scan by the region of safety check between two scan-side, and not need the large distance between two scan-side.

As discussed previously, composition graphs 1, design of the present invention allows more multi-detector panel to be present on direct backscattering path, thus contributes to picture quality.In another embodiment, by using the method for the region increasing field of detection and the detector number that can adopt to increase picture quality further.This novel methods is described in conjunction with Figure 12 and 13.Figure 12 illustrates that display uses single source 1201 to carry out the side view of vertical scanning.In this configuration, the height 1202 of the target 1203 that single source 1201 can be used to scan is limited to the illumination zone in wide viewing angle 1204 or source.

In order to overcome this limitation, in one embodiment, the present invention adopts the structure of the novelty shown in Figure 13, and Figure 13 illustrates the top view that exemplary scan is arranged.See Figure 13, single axle scan source assembly 1301 is pivoted to 1302b from a 1302a, and the center 1303 of rotation is positioned on the front panel of system.As can be seen from Figure 13, when source 1301 is fixed, 1304a is the wide viewing angle for target 1306, but when source pivotable, 1304b is available wide viewing angle.Therefore, the wide viewing angle for given source expands when when source pivotable.In this case, the detecting device 1305 of larger quantity can add system to, thus provides the surveyed area of increase.And fixing rectangular aperture is arranged on front panel, also serves as and keep the aperture that focus is very little at least one axle.And, by the optional pivotable source shown in Figure 13, identical system can be adopted with scanning target when human motion (source is pivotable not) or when human body static (source pivotable).Use static object, nominally picture quality is better than the picture quality when object motion, because the friction speed of the position of the target of movement (such as leg and arm) can cause distortion.Therefore, under certain operational circumstances, if find irregular article (during when object motion) in the first scanning, so identical system can scan (object is static) in more detail.Scanning requirement is depended in the selection of system, and is the balance between threat detection and high-throughput.

Secondly, the distribution of electronic unit causes obtaining signal to noise ratio (S/N ratio) more better than prior art systems.Usually, in safe examination system, video card is positioned at a distance of detecting device a distance, causes high s/n ratio when scan image is transmitted effect of signals.In various embodiments of the present invention, in order to obtain better signal to noise ratio (S/N ratio), multiple amendment is carried out to the circuit of safe examination system.First, photomultiplier (PMT) card is integrated in photomultiplier plug.Secondly, analog to digital conversion is completed to reduce transient noise by the four-way near source.3rd, complete for the transient noise reduced and specifically improve wiring.4th, wire gauze is merged in synthesis/carbon fibre wall to produce the faraday cup to electromagnetic interference (EMI) immunity.5th, motion controller is moved away from other electronic equipment, and near the article that their control, to minimize wiring from the signal in these electric wires and electronic interferences.More than amendment causes the image of higher contrast, and this image ratio prior art systems is good.

3rd, in safe examination system of the present invention, use the x-ray dose changeably increased can obtain the signal to noise ratio (S/N ratio) of the improvement being better than prior art systems.The safe examination system of prior art is limited to the radiation dose used up to 10 micro-rems.But the system of renewal uses the dosage up to 25 micro-rems.In the various embodiments of the invention, using variable x-ray dose, namely when scanning the not too responsive body part such as such as pin, increasing x-ray dose (or residence time).

In one embodiment of the invention, from the detection signal of photomultiplier based on just by which position of health of scanning and the relative position of x-ray source being weighted.Such as, if specific first area is pointed in source, so from the signal weighting of first area higher than the signal outside first area.Therefore, the instantaneous position of x-ray source is depended in weighting.

In addition, when the wave beam produced by x-ray source moves faster, the scintillator with faster response is needed.Response time of scintillator limits by from a focus to the time of next focus.Safe examination system of the present invention provided than the prior art systems response time faster, thus added the signal to noise ratio (S/N ratio) of safe examination system.

In addition, this system a) comprises internal security observation circuit with at each scan period monitoring system safety and radiation level continuously; B) provide not higher than the ionizing radiation dosage often scanning 5 micro-rems to anyone being in inspection; C) in the side of the time interscan people of 8 seconds or less; D) should have not higher than the length (length dimension is towards the people being in scanning) of 125cm; E) should have not higher than the width of 100cm; F) should have not higher than the height of 205cm; G) selectable wall should be had to help to cover just by the privacy of the target of safety check, and prevent background interference, this more obviously can increase the detectability of system in the picture by the inorganic objects that makes to be positioned at health side, and when not using wall, permission use 2 scanning instead of 4 scannings thought carry out all standing health; H) optional communication monitor should be had so that communicate between long-range examiner and local operator, and transmission has the image outline of the real body of highlighted searching position instead of the image (i.e. " Matchstick Men ") of Matchstick Men or simplification wherein, wherein, image quilt " calibration " is to adapt to the health height of the health height change relative to Matchstick Men of human body; I) 10 inchs of standing, the human body of 6 feet high should being scanned, measuring to the nose of human body from detecting wall for these 10 inches; J) should communicate with the workstation configured away from scanning system; K) likely scanning should be started from remote work station; L) can be configured to the scanning of everyone predetermined quantity, this should complete before being increased to next people; M) should allow before being increased to next people, take extra scanning as the options that can be used by operator; N) operator should be configured to force to make each to scan through or clear individually, even if when even identical people needs multiple scanning; O) should by means of be positioned at local system can the person of being remotely operated remotely see visible ray instruction by scanning result (by or failure) be sent to remote operator, that is, red light represents " failure ", and green light represents " passing through "; P) should be reported in when what operator of period logs in into system, and during this how many people by this operator scanning, have how many total numbers of persons to be scanned the period per hour of one day, and in the quantity of predetermined period (time such as little, sky or the moon) quantity of interscan and the people of scanning; Q) option of training simulators should be had, these training simulators have the image library of at least 100 training images, r) can scan the static object with 6 foot of 8 inch height or 6 foot of 6 inch height or more low height and 45 inch in width or 41 inch in width or less width; And s) scanning can be completed in 20 seconds, more preferably in 10 seconds or shorter.Therefore, United States Patent (USP) 7110493 is incorporated to herein by reference.

In one embodiment, the system incorporates autonomous detection.In one embodiment, autonomous detection comprises passenger except safety check or personal appraisal.In one embodiment, qualification is realized by bio-identification means, such as retina scanning, bioscan, fingerprint etc.In one embodiment, use I.D. as proof.In one embodiment, radio frequency identification bangle (RFID bracelet) is as identification apparatus.In one embodiment, identification apparatus is for storing about human body and relevant information thereof.Predetermined information is stored in the computing equipment automatically produced about the information of human body.

In one embodiment, identification apparatus is used in the method for certainty annuity Operation class.Such as, if the pilot with predetermined trust situation is scanned I.D. by biological identification device or proves its identity, so he can pass scanner under low-level radiation, and this people known is investigated, and does not need full scan.Therefore, in one embodiment, safe examination system of the present invention can for different people under varying level.

The invention exercise question transferring applicant of the present invention is that the U.S. Patent application 12/888412 of " Automated Personnel ScreeningSystem and Method " is here all incorporated to herein by reference.

In one embodiment, the profile of safe examination system of the present invention provides " zero stand-off ", and this system can directly be placed against wall.

Except adopting the passenger of system of the present invention for the crowded place, open air of safety check airport and railway station, such as stadium and shopping mall, the application of present system may also extend into the vehicles at intermediate transit point place and the contents of container such as checking such as harbour, border crossings and customs inspection post.In one embodiment, detection system is implemented as ' crossing ' system, and motorlorry to be scanned can cross this system, thus provides the second axle of motion.Detection system of the present invention is also for goals of medicine.

Above example is only many illustrative application of the present invention.Although only describe several embodiments of the present invention here, should be understood that, without departing from the spirit or scope of the present invention, the present invention can be presented as other specific forms many.Therefore, current example and embodiment should be thought illustrative, instead of restrictive.

Claims (17)

1., for detecting a check system for the object carried by static people, comprising:

First detection system, is configured to detect the radiation scattered out from described people, and described first detection system is configured to produce the electronic signal detected radiation being made to response;

Second detection system, is configured to detect the radiation scattered out from described people, and described second detection system is configured to produce the electronic signal detected radiation being made to response;

X-ray source, be positioned in the involution part between described first detection system and described second detection system, described x-ray source is connected to the chopper with diameter, and being configured to emitting x-ray through the space described first detection system and described second detection system, described space is limited by the width in the scope of 1/2 to 2 times of chopper diameter; And

Disposal system, for analyzing the electronic signal produced by described first detection system and described second detection system, and produces image over the display,

Wherein, described first detection system is included in the first involution part, and described second detection system is included in the second involution part, and described first involution part comprises:

First side, by having interior surface and limiting towards the flat surfaces of the outer surface of human body, described first side is configured to receive the radiation scattered out from people;

Second side, acutangulates relation with described first side, and described second side limits through the flat surfaces of the interior surface of the radiation of described first side by having to be suitable for receiving, and described second side is configured to only receive this radiation being radiated through described first rear flank;

First matrix, is positioned the interior surface of described first side, and described first matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation;

Second matrix, is positioned the interior surface of described second side, and described second matrix also comprises for receiving described radiation and is the activating area of light by described converting radiation; And

At least one photoelectric detector, have photoresponse region and non-photoresponse region, described photoresponse region is located, to receive the light emitted from described first matrix and described second matrix.

2. check system as claimed in claim 1, wherein, described chopper is wheel, and described wheel has three slits, and each slit is all orientated as and is separated by 120 degree with contiguous slit.

3. check system as claimed in claim 2, wherein, the described slit collimator slit parallel with at least two is aimed at, and the X ray launched from described x-ray source irradiates described collimator slit conically, to produce in time interleaved at least two parallel scanning beams.

4. check system as claimed in claim 1, wherein, described first involution part physically separates with described second involution part, and independent of described second involution part.

5. check system as claimed in claim 4, wherein, physically separates with described first involution part and described second involution part for the 3rd involution part holding x-ray source, and independent of described first involution part and described second involution part.

6. check system as claimed in claim 5, wherein, described first involution part, described second involution part and described 3rd involution part are all less than 88 pound weights.

7. check system as claimed in claim 5, wherein, described 3rd involution part is detachably connected to described first involution part and described second involution part.

8. check system as claimed in claim 5, wherein, described first involution part, described second involution part and described 3rd involution part are all detachably connected to framework.

9. check system as claimed in claim 1, wherein, described chopper comprises the disk chopper being configured to be rotated by motor.

10. check system as claimed in claim 9, wherein, the speed of described disk chopper is dynamically controlled by controller, with the sweep velocity of optimization X-ray beam.

11. check systems as claimed in claim 1, wherein, described radiation comprises x-ray photon, and described first matrix detects the 30%-60% of the x-ray photon clashing into described first side.

12. check systems as claimed in claim 11, wherein, described second matrix detects the 10%-30% of the x-ray photon clashing into described first side.

13. check systems as claimed in claim 1, wherein, described x-ray source is by being pivoted to second point from first and producing perpendicular fasciculus spot pattern, and described pivotable is felt relieved around the predetermined point of rotation.

14. check systems as claimed in claim 1, wherein, described x-ray source and described chopper are connected to and are configured to vertically tilt relative to induction element and motor are made to the surface of response.

15. check systems as claimed in claim 1, wherein, described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with the counterweight being configured to make described x-ray source balance.

16. check systems as claimed in claim 1, wherein, described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with at least one lifting belt.

17. check systems as claimed in claim 1, wherein, described x-ray source connects with vertical elevating mechanism, and described elevating mechanism connects with gear reducer and motor, and described elevating mechanism does not connect with counterweight.