CN106841249A - Transmission-type radiation image-forming system - Google Patents
Transmission-type radiation image-forming system Download PDFInfo
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- CN106841249A CN106841249A CN201710237120.7A CN201710237120A CN106841249A CN 106841249 A CN106841249 A CN 106841249A CN 201710237120 A CN201710237120 A CN 201710237120A CN 106841249 A CN106841249 A CN 106841249A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
The invention discloses a kind of transmission-type radiation image-forming system.Wherein, radiation source is used to launch the radiation beam for being imaged to object to be detected, different detector arrays is suitable to be arranged on different positions, for receiving the radiation beam transmitted from object to be detected with different angles, radiation beam modulating device is used to be modulated the radiation beam of radiation emission, to cause that radiation source has various emission modes, the incident angle or incident angle that the radiation beam on object to be detected is incided under different emission modes combine different, and it is different that detector array or the detector array combination of radiation beam are received under different emission modes.Thus, radiation source can be combined with different visual angles or visual angle and launch flying spot beam to object to be detected under the modulating action of radiation beam modulating device, with the transmission image of the object to be detected under obtaining different visual angles or visual angle combination, such that it is able to improve overlapped object problem present in transmission-type image.
Description
Technical field
The present invention relates to radiographic imaging arts, more particularly to a kind of transmission-type radiation image-forming system.
Background technology
The large-scale target such as vehicle and goods is checked using radiant image be comparative maturity safety check technology, according to
Image-forming principle is different, mainly there is transmission-type radiant image and the major class of scattering formula radiant image two.
In general, transmission-type radiation image-forming system is main by radiation source, the detector positioned at scanned object opposite side
Composition, radiation source is used to launch flying spot beam to scanned object, and detector is used to receive the spoke from scanned object transmission
Signal is penetrated, received radiation signal reflects the density of illuminated object, the thickness even information such as material, can show object
Internal structure, therefore the radiation signal that can be detected according to detector forms the transmission image of object to be detected.
The transmission image formed based on transmission-type radiant image principle is shown flying spot beam and is worn on propagation path
The projection information of saturating all substances, therefore inspected object on the propagation path of flying spot beam is multiple superposition objects
When, the transmission image formed based on the transmission signal that detector is received can not well differentiate the multiple objects for forward lapping.
At present, it is possible to use CT scan technology solves above-mentioned overlap problem, but for the inspection of this kind of large-sized object of vehicle, is swept using CT
Retouch technical difficulty and cost is high, and check extremely inefficient, practical application sexual valence is than extremely low.
Thus, it is desirable to a kind of transmission-type radiation image-forming system that can easily and effectively solve the problems, such as front and rear overlapped object.
The content of the invention
It is a primary object of the present invention to provide a kind of transmission that can be detected to object to be detected with different visual angles
Formula radiation image-forming system, to solve the problems, such as front and rear overlapped object present in transmission-type image.
According to an aspect of the invention, there is provided a kind of transmission-type radiation image-forming system, including：Radiation source, for
Object to be detected launches the radiation beam for being imaged；Multiple detector arrays, each detector array is visited including one or more
Device is surveyed, different detector arrays is suitable to be arranged on different positions, transmitted from object to be detected with different angles for receiving
Radiation beam；And radiation beam modulating device, it is modulated for the radiation beam to radiation emission, to cause that radiation source has
Various emission modes, wherein, the incident angle or incidence angle of radiation beam on object to be detected are incided under different emission modes
Degree combination is different, and it is different that detector array or the detector array combination of radiation beam are received under different emission modes.
Preferably, radiation beam modulating device can include：Shield, shield is provided with slit, the spoke of radiation emission
Beam can go out be shot out by slit；Control device, for controlling shield to be rotated around radiation source, to cause that it is many that slit has
Individual location status, multiple location status are corresponded with multiple detector arrays, the slit outgoing under each location status
The exit direction of radiation beam is substantially perpendicular to the test surface of corresponding detector array, and substantially excessively described detection
The center in face.
Preferably, radiation beam modulating device can include：Shield, shield is provided with multiple detector arrays one by one
Corresponding slit, the radiation beam of radiation emission can go out be shot out by slit, from going out for the radiation beam of each slit outgoing
Penetrate direction substantially perpendicular to corresponding detector array test surface, and substantially excessively described test surface center；
Radical occlusion device, the occlusion state of the radiation beam for controlling the slit outgoing from shield.
Preferably, radical occlusion device can include：Collimater, collimater is provided with one or more collimating slits, by movement
Collimater, changes the alignment of the slit on the collimating slit and shield in collimater, wherein, from the radiation of radiation source outgoing
Beam can go out to be shot out from slit and collimating slit in alignment successively.
Preferably, collimater includes one or more fixed parts and one or more movable parts, by mobile one
Or multiple movable parts, formed between one or more movable parts and one or more fixed parts and on shield
The collimating slit that individual or multiple slits are aligned.
Preferably, radical occlusion device can include：Block, by mobile block, slit outgoing of the control from shield
The occlusion state of radiation beam.
Preferably, radiation image-forming system can also include：Collimater, collimater is provided with the slit on shield one by one
Corresponding collimating slit, block is arranged between shield and collimater.
Preferably, radiation image-forming system can also include：Secondary shield, is arranged on the block both sides, for shielding spoke
Beam incides the scattering radiation beam produced after the block.
Preferably, under the modulating action of radiation beam modulating device, radiation source has two kinds of emission modes, the first transmitting
The incident angle that the first radiation beam on object to be detected is incided under pattern is vertical with the length direction of object to be detected, and second
Plant 5 °≤α≤10 ° of angle incided between the second radiation beam on object to be detected and the first radiation beam under emission mode.
Preferably, transmission-type radiation image-forming system can also include image processing apparatus, for multiple detector arrays
The radiation beam that middle different detector arrays are received is processed to form the scan image under different visual angles.
Preferably, radiation source can be rotated around predetermined rotating shaft in predetermined angular range, to cause radiation source
The radiation beam for being suitable to be received by different detector arrays can be launched in rotary course.
Transmission-type radiation image-forming system of the invention can cause radiation source under the modulating action of radiation beam modulating device
Flying spot beam is launched to object to be detected with different emission modes, wherein, incide detected material under different emission modes
Incident angle or the incident angle combination of the radiation beam of body are different, it is possible thereby to obtain object to be detected at different visual angles or visual angle
Transmission image under combination, is analyzed by the transmission image under being combined to different visual angles or visual angle, can tell transmission
The multiple objects forward lapped in image.
Brief description of the drawings
Disclosure illustrative embodiments are described in more detail by with reference to accompanying drawing, the disclosure above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein, in disclosure illustrative embodiments, identical reference number
Typically represent same parts.
Fig. 1 shows the schematic block diagram of the basic structure of transmission-type radiation image-forming system of the invention.
Fig. 2A to Fig. 2 D shows the structure and modulated process of the radiation beam modulating device under one embodiment of the invention
Schematic diagram.
Fig. 3 A to Fig. 3 C show the structure of the radiation beam modulating device under another embodiment of the present invention and modulated
The schematic diagram of journey.
Fig. 4 A to Fig. 4 C show the structure of the radiation beam modulating device under another embodiment of the present invention and modulated
The schematic diagram of journey.
Fig. 5 A to Fig. 5 C show the structure of the radiation beam modulating device under another embodiment of the present invention and modulated
The schematic diagram of journey.
Fig. 6 A, Fig. 6 B show the structure and modulated process of the radiation beam modulating device under another embodiment of the present invention
Schematic diagram.
Fig. 7 A to Fig. 7 C show the structure of the radiation beam modulating device under another embodiment of the present invention and modulated
The schematic diagram of journey.
Specific embodiment
The preferred embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure without the embodiment party that should be illustrated here
Formula is limited.Conversely, these embodiments are provided so that the disclosure is more thorough and complete, and can be by the disclosure
Scope intactly conveys to those skilled in the art.
As it was previously stated, the transmission image that the principle based on transmission-type radiant image is formed is shown radiation beam is propagating road
The projection information of all substances penetrated on footpath, is unfavorable for differentiating the multiple objects for forward lapping.This is directed to, the present inventor exists
Found after further investigation, flying spot beam can be launched to object to be detected with different visual angles, to obtain the quilt under different visual angles
The transmission image of detection object, while the picture quality at each visual angle can not be reduced, safety and environmental protection can well solve transmission
Overlapped object problem present in formula image.
Based on above-mentioned thinking, the present invention proposes a kind of variable transmission-type radiation image-forming system in visual angle.Below mainly
The variable specific implementation of structure and visual angle of transmission-type radiation image-forming system of the invention is illustrated, wherein, on saturating
The image-forming principle of formula radiation image-forming system, detection process is penetrated no longer to describe in detail.
Fig. 1 shows the schematic block diagram of the basic structure of transmission-type radiation image-forming system of the invention.
Referring to Fig. 1, transmission-type radiation image-forming system 100 includes radiation source 1, radiation beam modulating device 2 and multiple detections
Device array 3.
Radiation source 1 is used to launch the radiation beam for being imaged to object to be detected.Wherein, radiation beam can be penetrated for gamma
Line, X-ray or neutron, correspondingly, radiation source 1 can occur for radio isotope, electron accelerator, X-ray production apparatus or neutron
Device.Except the core included for radiation-emitting, (accelerating tube of such as electron linear accelerator, electronic induction adds radiation source 1
The sourcehead of fast device, the X-ray tube of X-ray production apparatus) outward, the parts such as power supply, the cooling of periphery auxiliary can also be included.On radiation
The concrete structure that source 1 can have is known to those skilled in the art, repeats no more here.
Each detector array 3 can include one or more detectors, and different detector arrays 3 are suitable to be arranged on not
Same position, for receiving the radiation beam transmitted from object to be detected with different angles.
Used as an alternative embodiment of the invention, under the modulating action of radiation beam modulating device 2, radiation source 1 can be with
With two kinds of emission modes.The incidence angle angle of the first radiation beam on object to be detected is wherein incided under the first emission mode
Degree can be vertical with the length direction of object to be detected, and the second radiation on object to be detected is incided under second emission mode
There can be certain angle α between beam and the first radiation beam, the size of angle α can set according to actual conditions, such as 5 °
≤α≤10°.Now, multiple detector arrays can include the first detector array and the second detector array, the first transmitting mould
The radiation beam launched under formula can be received by the first detector array, and the radiation beam launched under the second emission mode can be by second
Detector is received.
Radiation beam modulating device 2 is used to be modulated the radiation beam of the transmitting of radiation source 1, to cause that it is many that radiation source 1 has
Emission mode is planted, wherein, the incident angle or incident angle of the radiation beam on object to be detected are incided under different emission modes
Combination is different, and it is different that detector array or the detector array combination of radiation beam are received under different emission modes.Herein
" incident angle " addressed refers to the direction of propagation and object to be detected and the transmission-type spoke of the radiation beam for inciding object to be detected
Angle between the direction of relative movement penetrated between imaging system.
Thus, at the radiation beam for being received to detector array under different emission modes or detector array set splice grafting
Reason, can obtain transmission image under different emission modes or transmission image combination, transmission image under different emission modes or
Transmission image combination can be considered as the transmission image under different visual angles or visual angle combination.
When radiant image is carried out to object to be detected using transmission-type imaging system 100 of the invention, it is possible to use spoke
Beam modulation device 2 controls radiation source 1 to irradiate object to be detected with different emission modes, to obtain different visual angles or different visual angles
The transmission image of the lower object to be detected of combination, such that it is able to improve overlapped object problem present in transmission-type image.
For example, during object to be detected is checked using transmission-type imaging system 100 of the invention, can keep many
Individual detector array 3 is motionless, and first in the presence of radiation beam modulating device 2, control radiation source 1 is with the first emission mode to quilt
Detection object launches radiation beam, can be received from quilt by the first detector array or the first detector array set splice grafting under the pattern
The radiation beam of detection object transmission, the radiation beam received based on the first detector array or the first detector array set splice grafting is formed
Transmission image or transmission image combination can be considered as the first visual angle or the first visual angle combination under transmission image.Then can be
In the presence of radiation beam modulating device 2, control radiation source 1 launches radiation beam, the mould with the second emission mode to object to be detected
The radiation beam transmitted from object to be detected, base can be received by the second detector array or the second detector array set splice grafting under formula
Transmission image or transmission image group that the radiation beam received in the second detector array or the second detector array set splice grafting is formed
Conjunction can be considered as the transmission image under the second visual angle or the combination of the second visual angle.Thus, it is possible to obtain object to be detected be regarded in difference
Transmission image under angle or visual angle combination, is analyzed, Ke Yifen by the transmission image under being combined to different visual angles or visual angle
Discern the multiple objects forward lapped in transmission image.
Further, since the radiation beam under different emission modes is radiation source 1 not sending in the same time, therefore using this
While the transmission-type radiation image-forming system of invention obtains the transmission image under different visual angles or visual angle combination, different emission modes
Between radiation beam will not produce interference, it is ensured that the quality of resulting transmission image.
Used as an alternative embodiment of the invention, transmission-type radiation image-forming system of the invention can also include at image
Reason device, is regarded for being processed the radiation beam that different detector arrays in multiple detector arrays are received with forming difference
Scan image under angle.Specifically, image processing apparatus can be aobvious including image collection module, image processing module and image
Show module.Image collection module can obtain the radiation beam signal of the reception of detector array 3, and image processing module can be to image
The radiation beam signal that acquisition device is obtained is processed to form the scan image checked for user, and image display can show
Show the scan image that image processing apparatus are formed.Image collection module, image processing module and image display can be used
Any existing known technology in the art, is that those skilled in that art are readily appreciated that, I will not elaborate.
It should be noted that in the transmission image under showing the multiple emission modes obtained using the present invention, Ke Yi
The different windows of same display show, it is also possible to shown on different displays, preferably can be in same display
Same window shown, and can be shown using various 3D such as aberration formula, polarization type, active-shutter or bore hole formula
Mode is shown.
So far the basic structure and operation principle of transmission-type radiation image-forming system are schematically illustrated with reference to Fig. 1.According to above
Description to transmission-type radiation image-forming system of the invention understands key point of the invention is how to modulate dress using radiation beam
The angle of flow of the radiation beam of the transmitting of 2 control radiation source 1 is put, to form above-mentioned various emission modes.With reference to specific embodiment
The concrete structure that can have with regard to radiation beam modulating device 2 is schematically illustrated, it should be appreciated that the radiation beam modulation hereafter addressed
The structure of device 2 should not be construed as limiting the invention, and radiation beam modulating device 2 can also have other knots hereafter addressed
Configuration formula.
Embodiment one
Referring to Fig. 2A, Fig. 2 B, radiation beam modulating device can be made up of shield 4 and control device (not shown).
Wherein, associated description above is can be found on radiation source 1 and detector array 3, is repeated no more here.
Shield 4 is provided with slit 41, and shield 4 is mainly used in entering the exit direction of the radiation beam of the transmitting of radiation source 1
Row constraint so that the radiation beam of the transmitting of radiation source 1 only can go out be shot out by slit 41.Wherein, it is arranged on shield 4
Slit 41 can have certain height and width, can be used for subtended angle of the radiation beam in short transverse that limitation passes through slit 41
And the width on scanning direction (direction of relative movement between transmission-type radiation image-forming system and object to be detected).
Control device can control shield 4 to be rotated around radiation source 1, to cause that slit 41 has multiple location status, and
And multiple location status are corresponded with multiple detector arrays.Here the correspondence addressed refers to narrow under each location status
The radiation beam for stitching outgoing can be received by corresponding detector array, i.e., the radiation of the slit outgoing under each location status
The exit direction of beam is substantially perpendicular to the test surface of corresponding detector array, and substantially crosses in test surface
The heart.Thus, a location status can be considered as a kind of emission mode, can be by not from the radiation beam of outgoing under different location status
Same detector array is received.
As shown in Figure 2 A, radiation source 1 can be considered as a point source, and control device can control the shield 4 to be with radiation source 1
Center is rotated, and when shield 4 to be rotated to the position shown in figure, can be led to from the radiation beam 1a of the transmitting of radiation source 1
Cross slit 41 to go out to be shot out, and received by detector array 3a.And from radiation beam 1b then shielded body 4 of the transmitting of radiation source 1
Block, it is impossible to received by detector array 3b.
Direction rotating shield 4 shown in the arrow shown in along Fig. 2A, the position shown in Fig. 2 B is rotated to by shield 4
When putting, can go out be shot out by slit 41 from the radiation beam 1b of the transmitting of radiation source 1, and be received by detector array 3b, and
From the radiation beam 1a of the transmitting of radiation source 1, then shielded body 4 is blocked, it is impossible to received by detector array 3a.
Thus, by rotating shield 4, thus it is possible to vary the location status of the slit 41 on shield 4 so that from slit 41
The radiation beam of outgoing can be received by different detector arrays.
Alternatively, shield 4 can be made up of radiation shielding material, can be used for radioactive source shielding 1 transmitting without screen
Cover the radiation beam of the outgoing of slit 41 on body 4, you can for the close rate of shielding unwanted radiation beam leakage.
As shown in Fig. 2 C, 2D, collimater 5 can also be provided with the outside of shield 4.Collimater 5 be provided with shield 4
Slit 41 alignment collimating slit 51, the radiation beam of the outgoing of slit 41 from shield 4 can be by the collimation in collimater 5
Seam 51 goes out to be shot out.Now, control device can control shield 4 and collimater 5 together to be rotated around radiation source 1, with formation
Multiple location status that text is addressed.
Embodiment two
Radiation beam modulating device can be made up of shield and radical occlusion device.
From unlike the shield in embodiment one, multiple slits can be provided with the shield in the present embodiment, from
The shooting angle of the radiation beam of different slit outgoing is different, and multiple slits are corresponded with multiple detector arrays.Here right
Should refer to that the detection of corresponding detector array is substantially perpendicular to from the exit direction of the radiation beam of each slit outgoing
Face, and the center of test surface is substantially crossed, to allow never with the radiation beam of slit outgoing by corresponding detector array
Row are received.
Radical occlusion device can be used for the occlusion state of the radiation beam of slit outgoing of the control from shield.By to never
Blocked with the radiation beam of slit outgoing, thus it is possible to vary the distribution of the detector array of radiation beam is received, such that it is able to shape
Into different emission modes.
The structure that can have with regard to radical occlusion device below in conjunction with the accompanying drawings is described further.
1st, radical occlusion device is made up of block
Referring to Fig. 3 A, Fig. 3 B, multiple detector arrays can include the first detector array 3a and the second detector array
3b, can be provided with two slits 41a and 41b on shield 4, slit 41a is corresponding to the first detector array 3a, slit 41b pairs
Should be in the second detector array 3b.
When block 6 is located at the position shown in Fig. 3 A, slit 41a is blocked, and the radiation beam 1a from slit 41a outgoing can not
Received by the first detector array 3a；Slit 41b is not blocked, can be by the second detection from the radiation beam 1b of slit 41b outgoing
Device 3b is received.
When block 6 to be rotated to the position shown in Fig. 3 B, slit 41b is blocked, from the radiation beam 1b of slit 41b outgoing
Can not be received by the second detector array 3b；Slit 41a is not blocked, and the radiation beam 1a from slit 41a outgoing can be by first
Detector 3a is received.
When block 6 to be rotated to the position shown in Fig. 3 C, slit 41a and slit 41b are not blocked, therefore from slit
The radiation beam 1a of 41a outgoing can be received by the first detector 3a, can be by the second detection from the radiation beam 1b of slit 41b outgoing
Device array 3b is received.
Thus, it is possible to pass through to move the occlusion state of radiation beam of the block to control the slit outgoing from shield, with
Form different emission modes.
Referring to Fig. 4 A, Fig. 4 B, Fig. 4 C, collimater 5, collimater can also be provided with the side away from shield 4 of block 6
5 are provided with and the one-to-one collimating slit (5a, 5b) of slit (41a, 41b) on shield 4.And also can be in block 6
Both sides are provided with secondary shield 7, can be used for radiation-screening beam and incide the scattering radiation beam produced after block 6.
As shown in Fig. 4 A, Fig. 4 B, Fig. 4 C, the spoke of the slit outgoing from shield can be controlled by mobile block 6
The occlusion state of beam, to form different emission modes.Wherein, specific move mode may refer to saying for Fig. 3 A to Fig. 3 C
It is bright, repeat no more here.
2nd, radical occlusion device is made up of collimater
One or more collimating slits can be provided with collimater, the standard in collimater can be changed by mobile collimater
The alignment of the slit on vertical masonry joint and radical occlusion device, can be from the collimation in alignment from the radiation beam of radiation source outgoing
Seam and slit go out to be shot out.Wherein, movement described herein can include translation and rotate.
Referring to Fig. 5 A, Fig. 5 B, Fig. 5 C, multiple detector arrays can include the first detector array 3a and the second detector
Array 3b, can be provided with two slits 41a and 41b on shield 4, slit 41a is corresponding to the first detector array 3a, slit
41b corresponds to the second detector array 3b.Direction from the radiation beam of slit 41a outgoing is perpendicular to the first detector array 3a's
Test surface, from the direction of the radiation beam of slit 41b outgoing perpendicular to the second detector array 3b test surface.
Four collimating slits can be provided with collimater 5, for the ease of distinguishing, the first collimating slit 51a, the second standard is properly termed as
Vertical masonry joint 51b, the 3rd collimating slit 51c, the 4th collimating slit 51d.
The alignment of the slit on the collimating slit and shield 4 in collimater 5 can be changed by mobile collimater 5,
Form different emission modes.
Specifically, collimater 5 can be moved to the position shown in Fig. 5 A so that the first collimating slit 51a and slit 41a
In alignment, can go out be shot out from slit 41a and the first collimating slit 51a from the radiation beam 1a of the transmitting of radiation source 1, by the
One detector array 3a is received.Now, the radiation beam 1b from the transmitting of radiation source 1 hides collimated device 5 from after slit 41b outgoing
Gear, the second detector array 3b cannot receive radiation beam.Scan pattern under the state is properly termed as the scanning of the first visual angle.
When collimater 5 can also be moved into the position shown in Fig. 5 B so that the second collimating slit 51b and slit 41b is in
Alignment, can go out be shot out from the radiation beam 1b of the transmitting of radiation source 1 from slit 41b and the second collimating slit 51b, be visited by second
Device array 3b is surveyed to receive.Now, the radiation beam 1a from the transmitting of radiation source 1 blocks collimated device 5 from after slit 41a outgoing, the
One detector array 3a cannot receive radiation beam.Scan pattern under the state is properly termed as the scanning of the second visual angle.
When collimater 5 to be moved to the position shown in Fig. 5 C, slit 41a is aligned with the 3rd collimating slit 51c, slit 41b
It is aligned with the 4th collimating slit 51d.Now the radiation beam 1b from the transmitting of radiation source 1 can go out from slit 41b and the 4th collimating slit 51d
It is shot out, is received by the second detector array 3b.Can be collimated from slit 41a and the 3rd from the radiation beam 1a of the transmitting of radiation source 1
Seam 51c goes out to be shot out, and is received by the first detector array 3a.Scan pattern under the state is properly termed as double-view angle scanning.
Thus, it is also possible to by being provided with one or more collimating slits in collimater 5, changed by mobile collimater 5
The alignment of the slit on collimating slit and shield 4 in collimater 5, to form different emission modes.
Fig. 6 A, Fig. 6 B show another mobile collimater 5 to change on collimating slit and shield 4 in collimater 5
The schematic diagram of the alignment of slit.
A collimating slit 51 can be provided with referring to Fig. 6 A, Fig. 6 B, in collimater 5, can be changed by rotary collimator 5
The slit being aligned with collimating slit 51, is received with the radiation beam for radiation source 1 is launched by different detector arrays.
Above in association with having illustrated situation when collimater 5 is provided with fixed collimating slit.In addition, collimater can also be by
One or more fixed parts and one or more movable parts are constituted, can by mobile one or more movable parts,
Formed between one or more movable parts and one or more fixed parts and be aligned with one or more slits on shield
Collimating slit.
As shown in Figure 7 A, collimater can be made up of (30,31,32) the part of left, center, right three, left part 30 and right side
Points 32 is fixed part, and center section 31 is movable part, center section 31 can according to control system to the left part 30 or
Right part 32 is moved.When part 30 is moved and fitted with it to the left for center section 31, form image-forming radiation beam 1a and pass through
Collimater seam 31a；Conversely, as shown in Figure 7 B, when part 32 is moved and fitted with it to the right for center section 31, being formed into
As the collimating slit 31b that radiation beam 1b passes through.
In addition, as seen in figure 7 c, can also be center section 31 for fixed part, left part 30 and right part 32 are
Movable part, left part 30 and right part 32 can be according to control system orders closer or far from center section 31.Work as left side
When part 30 is away from center section 31, collimating slit 31b can be formed, when right part 32 is away from center section 31, can be with shape
Into collimating slit 31a.When collimating slit 31a is formed, can cause that the first detector array 3a is received from slit 41a and collimating slit
The radiation beam 1a of 31a outgoing.When collimating slit 31b is formed, can cause the second detector array 3b receive from slit 41b and
The radiation beam 1b of collimating slit 31b outgoing, when collimating slit 31a and 31b is formed simultaneously, can cause the first detector 3a and second
Detector 3b can receive radiation beam.
Finally it should be noted that being suitable to receive the radiation beam of different angles due to different detector arrays, therefore it is
Enable that radiation source 1 provides the radiation beam of enough angular ranges, the radiation source 1 in the various embodiments described above can be configured so that
Rotary structure, i.e. radiation source 1 can be rotated (specific angular range around predetermined rotating shaft in predetermined angular range
Can be set according to actual conditions), it is suitable to be connect by different detector arrays to cause radiation source to launch in rotary course
The radiation beam for receiving.Specifically setting on rotary structure is known to those skilled in the art, repeats no more here.
For example, the axle that the radiation source 1 in the various embodiments described above can in a steady stream be put with overshoot is rotated, to ensure radiation
Source radiation beam axis direction can just to being used detector array.Here radiation source source point is radiation emission imaging spoke
The source point of the initial position of beam, such as electron linear accelerator refers to the position of the electron bombardment metallic target for accelerating to complete, and imaging is used
X-ray be approximately point source with the position as source point.
Radiation beam axis direction mentioned above is generally the center position of the radiation beam of radiation emission, wherein for adding
Direction of motion when fast device refers to electron bombardment metallic target.The radiation beam 1a and 1b shown in accompanying drawing 2A~7C are radiation beam in width
The center in direction is spent, when without special instruction, the exit direction of above-described radiation beam, the angle of emergence of described radiation beam
Degree, the incident angle of described radiation beam refer both to direction and the angle at radiation beam width center.
The test surface of detector array mentioned above refers to horizontal stroke of the detector sensitive area on radiation beam width
Section, detector sensitive area is cuboid (it is preferred that size of the detector sensitive area in radiation beam direction under normal circumstances
Much larger than the size of radiation beam width, to improve detection efficient and reduce pel spacing), now detector sensitive area is being just
The plane of incidence to radiation source is test surface.Address above " exit direction of radiation beam is substantially perpendicular to corresponding
The " center " of the test surface of detector array and substantially excessively described test surface, it is intended to ensure that detector radiation-sensitive region is use up
May be completely covered by radiation beam, to improve detection efficient, this is the common knowledge of this area.
Further, the critical piece (shield, collimater, block etc.) of the radiation beam modulating device addressed above can
It is made with preferably by steel, lead, tungsten or alloy or composite containing steel, lead or tungsten.
Above transmission-type radiation image-forming system of the invention is described in detail by reference to accompanying drawing.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
Best explaining principle, practical application or the improvement to the technology in market of each embodiment, or make the art
Other those of ordinary skill are understood that each embodiment disclosed herein.
Claims (11)
1. a kind of transmission-type radiation image-forming system, including：
Radiation source, for launching the radiation beam for being imaged to object to be detected；
Multiple detector arrays, each detector array includes one or more detectors, and different detector arrays is suitable to set
Put in different positions, for receiving the radiation beam transmitted from the object to be detected with different angles；And
Radiation beam modulating device, is modulated for the radiation beam to the radiation emission, to cause that the radiation source has
Various emission modes, wherein, the incident angle of the radiation beam on the object to be detected is incided under different emission modes or is entered
Penetrate angle combinations different, and detector array or the detector array combination of radiation beam are received under different emission modes not
Together.
2. transmission-type radiation image-forming system according to claim 1, wherein, the radiation beam modulating device includes：
Shield, the shield is provided with slit, and the radiation beam of the radiation emission can go out project by the slit
Go；
Control device, for controlling the shield to be rotated around the radiation source, to cause that the slit has multiple positions shape
State, the multiple location status are corresponded with the multiple detector array, the slit outgoing under each location status
The exit direction of radiation beam is substantially perpendicular to the test surface of corresponding detector array, and substantially excessively described detection
The center in face.
3. transmission-type radiation image-forming system according to claim 1, wherein, the radiation beam modulating device includes：
Shield, the shield is provided with and the one-to-one slit of the multiple detector array, the radiation emission
Radiation beam can go out be shot out by the slit, substantially hung down from the exit direction of the radiation beam of slit outgoing each described
It is straight in the test surface of corresponding detector array, and substantially excessively described test surface center；
Radical occlusion device, the occlusion state of the radiation beam for controlling the slit outgoing from the shield.
4. radiation image-forming system according to claim 3, wherein, the radical occlusion device includes：
Collimater, the collimater is provided with one or more collimating slits, by the movement collimater, changes the collimater
On collimating slit and the shield on slit alignment,
Wherein, can go out to project from slit and collimating slit in alignment successively from the radiation beam of the radiation source outgoing
Go.
5. radiation image-forming system according to claim 4, wherein, the collimater include one or more fixed parts and
One or more movable parts,
It is described solid with one or more in one or more described movable parts by mobile one or more described movable parts
Determine to form the collimating slit being aligned with one or more the described slits on the shield between part.
6. radiation image-forming system according to claim 3, wherein, the radical occlusion device includes：
Block, by the movement block, the occlusion state of the radiation beam of slit outgoing of the control from the shield.
7. radiation image-forming system according to claim 6, also includes：
Collimater, the collimater is provided with and is set with the one-to-one collimating slit of slit on the shield, the block
Between the shield and the collimater.
8. radiation image-forming system according to claim 7, also includes：
Secondary shield, is arranged on the block both sides, and the scattering radiation produced after the block is incided for radiation-screening beam
Beam.
9. transmission-type radiation image-forming system according to claim 1, wherein, make in the modulation of the radiation beam modulating device
Under, the radiation source has two kinds of emission modes,
The incident angle of the first radiation beam on the object to be detected is incided under the first emission mode to be detected with described
The length direction of object is vertical,
Incided under second emission mode between the second radiation beam on the object to be detected and first radiation beam
5 °≤α≤10 ° of angle.
10. the transmission-type radiation image-forming system according to any one of claim 1 to 9, also includes：
Image processing apparatus, at the radiation beam that is received to different detector array in the multiple detector array
Manage to form the scan image under different visual angles.
The 11. transmission-type radiation image-forming system according to any one of claim 1 to 9, wherein, the radiation source can
Rotated in predetermined angular range around predetermined rotating shaft, to cause that the radiation source can launch suitable in rotary course
In the radiation beam received by different detector arrays.
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| CN201710237120.7A CN106841249A (en) | 2017-04-12 | 2017-04-12 | Transmission-type radiation image-forming system |
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