CN110383051A - X ray checking device - Google Patents
X ray checking device Download PDFInfo
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- CN110383051A CN110383051A CN201880015777.1A CN201880015777A CN110383051A CN 110383051 A CN110383051 A CN 110383051A CN 201880015777 A CN201880015777 A CN 201880015777A CN 110383051 A CN110383051 A CN 110383051A
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- 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
- G01N23/046—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 using tomography, e.g. computed tomography [CT]
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Abstract
The present invention provides a kind of X ray checking device, can make the radioscopy image for reconstructing required region of only CT image.Image acquiring unit 71 obtains the image of benchmark image and the workpiece for the object for becoming trimming for determining visual field absent region from X-ray detector 3.The average brightness value of the image without visual field missing in 72 calculating benchmark image of average brightness value calculation part.Visual field absent region determination unit 73 is directed to captured fluoroscopy images, and the pixel of the brightness of the threshold value with less than average brightness value calculation part 72 average brightness value calculated is determined as visual field absent region.Trimmed image acquisition unit 75 obtains the radioscopy image other than visual field absent region from the shooting resulting image of workpiece.Processing unit 8 is reconstructed according to the radioscopy image other than visual field absent region, reconstructs CT image.
Description
Technical field
Embodiments of the present invention are related to a kind of X-ray examination dress for not generating visual field missing around shooting image
It sets.
Background technique
X ray checking device include X-ray irradiation source, load inspection object (hereinafter referred to as workpiece) workbench,
And receive the X-ray detector for having penetrated the X-ray of workpiece.The X-ray issued from irradiation source in expand coniformly and to
Up to workpiece, also further expansion and X-ray detector is reached after workpiece.X-ray with until from x-ray source to detector
Distance (focus to detector distance (Focus to Detector Distance, FDD)) square proportionally decays.It is another
Aspect, the shooting multiplying power of computed tomography (Computed Tomography, CT) image be FDD divided by from x-ray source to
Load distance (focus to centre distance (the Focus to Center until the center of the sample table of subject
Distance, FCD)) resulting value.Therefore, in order to desired shooting multiplying power, and signal-to-noise ratio is shot with high dose of X-ray
(Signal/Noise, S/N) good CT image, as long as maintaining shooting multiplying power and reducing FDD and FCD.
Existing technical literature
Patent document
Patent document 1: Japanese Patent Laid-Open 2016-118394 bulletin
Summary of the invention
Problem to be solved by the invention
But if reducing FDD, the missing of the visual field as caused by roentgenogram firing angle is generated, i.e., X-ray is not radiated at inspection
Survey the range of device.Big detector is more used, visual field missing is more easy to produce.In the state of there are visual field missing, CT image
Shooting lead to the problem of it is following.
(1) it in CT image when reconstructing, needs the straight line of the central link of x-ray source and sample table being located at detector
This information of where.When the radioscopy image according to captured by from 360 ° of directions symmetry (0 °~180 ° with 180 °~
360 °) come when finding out the information, visual field lack part becomes obstacle, there is the case where can not correctly finding out.Visual field missing
Partially due to brightness is approximately fixed and well-symbolized, therefore the symmetry judgement original to fluoroscopy images causes big influence.
(2) even if CT image can be reconstructed correctly finding out the straight line of the central link of x-ray source and sample table
In the case of, also there is visual field lack part in the circumferencial direction for the CT image that reconstructs that treated, and become even roentgenogram firing angle
Radioscopy image that unwanted part in addition all includes, CT image.Therefore, it in terms of image procossing, generates following
Problem.
Example 1: when wanting automatically to extract subject part from CT image, the average brightness value of object is used
It is more in the threshold value the case where, but visual field absent region all regards object as sometimes.
Example 2: when according to CT image to make three-dimensional data, CT image circumferencial direction there are visual field lack part,
Therefore become the three-dimensional data as that can see visual field lack part on the outside.
In the case where illumination angle as described above is bigger than the light receiving area of detector, even if penetrating detector close to X
The problem of line source, the whole region of light receiving area are also included in the range of exposures of X-ray, therefore there is no visual field missings, but
In the case where illumination angle is small, if reducing FDD, lead to the problem of with the various of visual field missing.Therefore, in the past in check object
It is dedicated using small FDD without using big detector in the case that amplification degree etc. small-sized and that needs are big requires small FDD
Thus small detector does not generate visual field missing.
In addition, being trimmed as recorded in patent document 1 to a part using image captured by X-ray
Itself is known, but only user extracts the technology in desired region to these prior arts from shooting image,
The elimination that visual field when can not be applied to reduce the FDD of detector lacks.
Present embodiment is to solve problem of the prior art point as described above and presenter.The mesh of present embodiment
Be a kind of X-ray examination dress of radioscopy image that can make region required for the reconstructing of only CT image is provided
It sets.
Technical means to solve problem
The X ray checking device of first embodiment has following structure.
(1) irradiation source of X-ray, load inspection object workbench and X-ray detector, reception penetrated inspection
The X-ray of object simultaneously detects it through image.
(2) shift mechanism moves the X-ray detector along the optical axis of X-ray.
(3) control unit controls the movement of the X-ray detector using the shift mechanism.
(4) image acquiring unit, obtained from the X-ray detector for determine the benchmark image of visual field absent region with
The image of the inspection object of object as trimming.
(5) average brightness value calculation part, the average brightness value of the image without visual field missing in calculating benchmark image.
(6) visual field absent region determination unit will have less than described average bright for captured radioscopy image
The pixel of the brightness of the threshold value of angle value calculation part average brightness value calculated is determined as visual field absent region.
(7) trimmed image acquisition unit obtains the visual field absent region and sentences from the shooting resulting image of inspection object
Determine image of the radioscopy image other than the visual field absent region that portion is determined as pruning region.
(8) processing unit is reconstructed, according to the radioscopy figure of pruning region acquired in the trimmed image acquisition unit
Picture reconstructs CT image.
In the first embodiment, to be advisable using following structure.
(1) boundary finishing portion, from the shooting resulting image of inspection object, to visual field absent region determination unit institute
The visual field absent region of judgement and the boundary in the region other than visual field absent region are modified.
The X ray checking device of second embodiment has following structure.
(1) irradiation source of X-ray, load inspection object workbench and X-ray detector, reception penetrated inspection
The X-ray of object simultaneously detects it through image.
(2) shift mechanism moves the X-ray detector along the optical axis of X-ray.
(3) control unit controls the movement of the X-ray detector using the shift mechanism.
(4) image acquiring unit, obtained from the X-ray detector for determine the benchmark image of visual field absent region with
The image of the inspection object of object as trimming.
(5) setting value acquisition unit reads in following data that user is previously entered.
(1) roentgenogram firing angle (α)
(2) detector spacing (mm/ detector channel)
(3) benchmark FDD (L1)
(6) benchmark range of exposures calculation part, according to the roentgenogram firing angle (α) as acquired in the setting value acquisition unit with
Benchmark FDD (L1) finds out the range of exposures of benchmark FDD (L1) as benchmark range of exposures (W1).
(7) camera site range of exposures calculation part, according to by the setting value acquisition unit and the benchmark range of exposures meter
Value acquired in calculation portion finds out the range of exposures (W2) of arbitrary FDD (L2) by following formulas 1.
Formula 1: want the range of exposures (W2) found out=benchmark range of exposures (W1) × (arbitrary FDD (L2)/benchmark FDD
(L1))
(8) pruning region calculation part is calculated by following formulas 2 calculated by the camera site range of exposures calculation part
Range of exposures (W2) be equivalent to several channels of detector, and find out pruning region.
Formula 2: range of exposures (W2)/detector spacing (mm/ detector channel) in pruning region=arbitrary FDD
(9) trimmed image acquisition unit obtains the pruning region calculation part from the shooting resulting image of inspection object
The radioscopy image of pruning region calculated.
(10) processing unit is reconstructed, according to the radioscopy figure of pruning region acquired in the trimmed image acquisition unit
Picture reconstructs CT image.
In this second embodiment, to be advisable using following structure.
(1) storage unit, by the pruning region of multiple FDD calculated by the pruning region calculation part and each FDD foundation pair
It should store.
(2) FDD at the shooting position of trimmed image acquisition unit check and inspection object reads corresponding repair from storage unit
Region is cut, and obtains the radioscopy image of pruning region.
Detailed description of the invention
Fig. 1 is the integrally-built block diagram for indicating first embodiment.
Fig. 2 is the figure for indicating an example of radioscopy image of the visual field absent region comprising first embodiment.
Fig. 3 is the integrally-built block diagram for indicating second embodiment.
Fig. 4 is the figure for illustrating to determine in the third embodiment the method for visual field absent region.
Specific embodiment
[1. first embodiment]
[structure of 1-1. embodiment]
Hereinafter, first embodiment is specifically described with reference to the accompanying drawings.First embodiment is using to fluoroscopy images
The threshold value that is previously set of brightness carry out trimmer.
As shown in Figure 1, the X ray checking device of present embodiment is configured to X-ray tube 1, load as radiation source
The workbench 2 for setting workpiece and the X-ray detector 3 for receiving the X-ray beam radiated from X-ray tube 1 keep defined interval
It is configured.
X-ray tube 1 is to issue coniform X-ray beam person in the horizontal direction from its focus, and X-ray beam is penetrated and loaded
Workpiece on workbench 2 reaches X-ray detector 3.Workbench 2 will be hung down by turntable (not shown) or XY driving mechanism
Histogram to axis centered on rotated, or in the shifting with the direction and X-ray detector 3 for approach/leaving X-ray tube 1
It is moved on parallel direction in dynamic direction.
X-ray detector 3 detects X-ray beam using two-dimensional spatial resolution, and output makes through aobvious as being shown in
Show the data on device or film.X ray checking device stops at X-ray detector 3 corresponding to the size of workpiece or required
The position for the defined FDD that shooting multiplying power is determined, and shoot workpiece.Therefore, X-ray detector 3 with as mobile
The shift mechanism 4 of driving source and the moving direction and amount of movement of the X-ray detector 3 using shift mechanism 4 controlled
Control unit 5 connects.Control unit 5 makes X-ray detector 3 in the direction that the optical axis along X-ray tube 1 moves, the i.e. side of FDD variation
It moves up.In control unit 5, the shift position of X-ray detector 3 or the input of moving direction is previously set for user in setting
Portion 6.Input unit 6 may include the input units such as keyboard, mouse, the external device (ED)s such as network etc..
X-ray detector 3 includes at the trimming for removing visual field absent region in captured image on stop position
Reason portion 7.The pruning modes portion 7 of present embodiment includes: image acquiring unit 71, average brightness value calculation part 72, visual field missing area
Domain determination unit 73, boundary finishing portion 74 and trimmed image acquisition unit 75.
Image acquiring unit 71 is obtained from X-ray detector 3 for determining the benchmark image of visual field absent region and becoming
The image of the workpiece of the object of trimming.So-called benchmark image refers to and does not reflect the radioscopy image for having any object.It is average bright
The central portion of the image without visual field missing in 72 calculating benchmark image of angle value calculation part, such as the upper right Biased hatches portion of Fig. 2
The average brightness value divided.Visual field absent region determination unit 73 is directed to the fluoroscopy images shot, will have less than average brightness value
The pixel of the brightness of the regulation % of the calculated average brightness value of calculation part 72 is determined as visual field absent region.Average brightness value
Regulation % is as can determine that threshold value the pixel belongs to visual field absent region, and user is in advance by described value from input unit 6
It is set in pruning modes portion 7.
It is believed that visual field absent region that visual field absent region determination unit 73 is determined using pixel unit and no visual field
The boundary in the region of missing becomes zigzag, therefore boundary finishing portion 74 carries out in such a way that visual field absent region becomes quadrangle
Adjustment.The method of adjustment can be suitable for adopting by a conventionally known method.For example, benchmark image is set as the two-dimensional coordinate of XY
Fixed, the straight line for passing through the direction XY of the maximum value or minimum value that have been judged as the coordinate of pixel of visual field absent region is set as
The outer rim in the region of no visual field missing.
Trimmed image acquisition unit 75 is obtained from the shooting resulting image of workpiece by the visual field obtained of boundary finishing portion 74
Radioscopy image other than absent region.In the outlet side of trimmed image acquisition unit 75, setting reconstructs processing unit 8, described
It reconstructs processing unit 8 and CT image is reconstructed according to the radioscopy image other than visual field absent region.
It is connected with storage unit 9 in each portion, the storage unit 9 is used to store and is suitable for reading to input from input unit 6
The data for the image that data, X-ray detector 3 are read in, the calculated result in pruning modes portion 7 or the visual field missing area determined
The data such as domain.The storage unit 9 includes the storage devices such as memory or hard disk.
[effect of 1-2. embodiment]
(1) judgement of visual field absent region
In the present embodiment, from input unit 6 input workpiece W camera site FDD, control unit 5 according to the FDD come
Shift mechanism 4 is controlled, X-ray detector 3 is made to stop at the position of inputted FDD.In this case, shooting do not reflect have it is any
The radioscopy image of object.It operates, is then can get in the image with no visual field missing as shown in Figure 2 if so
Centre portion and the fluoroscopy images for being formed in surrounding visual field absent region.In general, not reflecting the radioscopy figure for having any object
Picture without visual field missing image central portion (the upper right Biased hatches part of Fig. 2) be air fluoroscopy images, therefore with surrounding
Visual field absent region (the intersecting hachure part of Fig. 2) it is big compared to brightness, on the other hand, visual field absent region do not receive X-ray,
Therefore brightness is almost 0.
The fluoroscopy images of Fig. 2 are by from the output of X-ray detector 3 to image acquiring unit 71.Average brightness value calculation part 72 from
In the fluoroscopy images of input picture acquisition unit 71, the average brightness value of the image central portion lacked without visual field is calculated.Visual field missing
Regional determination portion 73 be directed to captured fluoroscopy images, determine the average brightness value calculated of average brightness value calculation part 72 and
Pixel with the less than user brightness of the threshold value set by the input unit 6 in advance, and regard the part of the pixel as visual field
Absent region.
The visual field absent region that boundary finishing portion 74 is determined with visual field absent region determination unit 73 using pixel unit
The mode that the boundary in the region lacked with no visual field becomes quadrangle is adjusted.In the present embodiment, benchmark image is made
It is the two-dimensional coordinate of XY to set, passes through the XY of the maximum value or minimum value that are determined as the coordinate of pixel of visual field absent region
The straight line in direction is set as the outer rim in the region of no visual field missing.The visual field absent region that obtains in this way is lacked without visual field
The coordinate in region storage unit 9 is saved in together with corresponding FDD.
(2) shooting of workpiece W
When shooting workpiece W, as described above stops at X-ray detector 3 and found out visual field absent region or without visual field
The position of the FDD of the coordinate in the region of missing.In this case, workpiece W is positioned on workbench 2, and shoots radioscopy
Image.The radioscopy image as detected by X-ray detector 3 is output to trimmed image acquisition unit 75.Trimmed image obtains
Portion 75 is taken to read coordinate corresponding with the FDD of the stop position of X-ray detector 3 from storage unit 9, and according to the coordinate bit
It sets, from the image obtained in the radioscopy image of workpiece W other than visual field absent region.
Structure again is output to by the radioscopy image other than the visual field absent region obtained of trimmed image acquisition unit 75
At processing unit 8, in reconstructing processing unit 8, CT image is reconstructed according to the radioscopy image of no visual field absent region.
[effect of 1-3. embodiment]
Present embodiment has the effect of as follows.
(1) reconstructing for image can be carried out according to the radioscopy image of no visual field absent region, therefore be can get and met
The CT image appropriate of the virtual condition of workpiece W.
(2) the whether size or FDD of which kind of X-ray detector 3, can be always with most suitable radioscopy image
Carry out CT image taking.
(3) even if making X-ray detector 3 and expand the feelings of X-ray geometry multiplying power close to X-ray generator side
Under condition, it is also possible to obtain the radioscopy image and CT image of no visual field missing.
(4) by being stored in storage unit 9 for FDD is with the foundation of the image of visual field absent region corresponding, if making X-ray detection
Device 3 stops at the FDD, then can not determine visual field absent region every time, and from the shooting resulting radioscopy figure of workpiece W
The fluoroscopy images without visual field absent region are obtained as in.
(5) it by boundary finishing portion 74, is lacked with the visual field absent region and no visual field that are determined using pixel unit
The boundary in region become the mode of quadrangle and be adjusted, therefore can get outer edge and modify to obtain beautiful no visual field missing area
The radioscopy image in domain.
[2. second embodiment]
[structure of 2-1. embodiment]
The structure in the pruning modes portion 7 of second embodiment is different from the first embodiment, and other structures are implemented with first
Mode is identical.Identical symbol is added to structure same as the first embodiment, and is omitted the description.
The pruning modes portion 7 of second embodiment includes: setting value acquisition unit 76, benchmark range of exposures calculation part 77, claps
It acts as regent and sets range of exposures calculation part 78 and pruning region calculation part 79.
Setting value acquisition unit 76 reads in following data that user in advance inputs input unit 6 (referring to Fig. 3).
(1) roentgenogram firing angle (α)
(2) detector spacing (mm/ detector channel)
(3) benchmark FDD (L1) (range of exposures is consistent with the light receiving surface of detector, does not generate the FDD of visual field missing)
Benchmark range of exposures calculation part 77 is according to roentgenogram firing angle (α) and benchmark as acquired in setting value acquisition unit 76
FDD (L1) finds out the range of exposures in benchmark FDD (L1) as benchmark range of exposures (W1).Camera site range of exposures
Calculation part 78 becomes known value according to by setting value acquisition unit 76 and benchmark range of exposures calculation part 77, utilizes triangle
It is similar, the range of exposures (W2) of arbitrary FDD (L2) is found out by following formulas.
Formula 1: want the range of exposures (W2) found out=benchmark range of exposures (W1) × (arbitrary FDD (L2)/benchmark FDD
(L1))
Pruning region calculation part 79 is calculated calculated range of exposures (W2) by following formulas and is equivalent to detector
Several channels, and find out pruning region.
Formula 2: range of exposures (W2)/detector spacing (mm/ detector channel) in pruning region=arbitrary FDD
[effect of 2-2. embodiment]
In this second embodiment, before shooting workpiece W, following values is inputted from input unit 6 and is stored in storage unit
9.These values are the intrinsic values of X-ray filming apparatus using second embodiment, as long as therefore setting it is primary, without every
It is all inputted when secondary shooting workpiece W.
(1) roentgenogram firing angle (α)
(2) detector spacing (mm/ detector channel)
(3) benchmark FDD (L1)
Then, in order to shoot the radioscopy image of workpiece W, X-ray detector 3 is made to be moved to the FDD's for wanting shooting
Position.The movement of X-ray detector 3 is the FDD (L2) that the camera site of workpiece W is inputted from input unit 6, and control unit 5 is according to institute
FDD is stated to control shift mechanism 4, X-ray detector 3 is made to stop at the position of inputted FDD.In addition, such as by manual
In the case that situation to keep X-ray detector 3 mobile does not know the FDD of camera site in advance like that, make X-ray detection
Device 3 stops in the state of camera site, its FDD is automatically or manually set as to the FDD (L2) of camera site, and is set in defeated
Enter portion 6.
It operates if so, then can get the value needed to execute the formula 1 and formula 2, therefore pruning modes portion 7 is set
Definite value acquisition unit 76 is read in these values and is found out in benchmark range of exposures calculation part 77 as the irradiation model in benchmark FDD (L1)
The benchmark range of exposures (W1) enclosed.If the benchmark range of exposures calculates once, as long as the light receiving area of X-ray detector 3
Or roentgenogram firing angle is not changed, even if then also becoming identical value, therefore in the case where the FDD of camera site is different
By being stored in storage unit 9, next time does not need to calculate later.
Based on the value found out in this way, camera site range of exposures calculation part 78 finds out the bat of workpiece W according to formula 1
Act as regent the range of exposures (W2) of the FDD (L2) set.Then, these values are based on, pruning region calculation part 79 is repaired according to formula 2 to find out
Cut region.
In this case, the radioscopy image of workpiece W is shot, and only extracts from described image and asks in this way
Pruning region out, that is, the image of the part of the range of exposures (W2) of FDD (L2), thus can shoot surrounding and not include view
The radioscopy image of field absent region.
In addition, in this second embodiment, the calculating of pruning region and the shooting of the radioscopy image of workpiece W is each
From data be stored in storage unit 9, and be suitable for reading, thus can first implement any one.
[effect of 2-3. embodiment]
In this second embodiment, in addition to the effect common with first embodiment, there is following distinctive effect.
(1) in this second embodiment, can according to roentgenogram firing angle (α) as shown in Figure 3, according to benchmark range of exposures
(W1) size of detector obtained and the information (L1, L2) of FDD, are trimmed by geometry calculating simply to find out
Region.
(2) second embodiment does not need to shoot in advance on the position of shooting workpiece as in the first embodiment empty yet
The fluoroscopy images of gas, and using the threshold calculations pruning region of brightness, therefore sentencing for pruning region can be implemented rapidly and simply
It is fixed.In addition, the boundary line in the region that visual field absent region is lacked with no visual field is again formed as linearly, therefore do not need to be used for yet
The calculating for modifying boundary part, it is also advantageous on this aspect.
[3. third embodiment]
Third embodiment is the variation of second embodiment.As shown in figure 4, by the method for second embodiment,
The pruning region (M2, M3, M4) as benchmark is found out using multiple FDD (L2, L3, L4) of shooting workpiece W are expected, and is stepped on
Note is in storage unit 9.
When shooting workpiece W, it is moved to X-ray detector 3 registered among multiple FDD of storage unit 9, it is most suitable
Radioscopy image is shot in the region of the FDD of the shooting of workpiece, and using the pruning region for corresponding to the FDD, from
Visual field absent region is removed in the radioscopy image of shooting.On the other hand, when there is no most suitable in registered FDD
When the FDD of the shooting of workpiece W, that is, when being shot on the arbitrary position FDD, using it is registered storage unit 9 most
The value of the value of close FDD and the pruning region for corresponding to it, according to the similar trimming to find out the arbitrary position FDD of triangle
Region.
In this way, in the third embodiment, in the position that visual field significantly lacks and the position that visual field does not lack, the two
Between position (can be multiple positions) photographs air radioscopy image, find out pruning region and register.Pruning region pair
It should be increased and decreased in geometry system, therefore the pruning region about the position not shot, be found out by carrying out interpolation.
In the third embodiment, the FDD of the pruning region at multiple shooting positions and each shooting position can be established in advance
It corresponds to store, the FDD of the camera site corresponding to workpiece W recalls pruning region appropriate, and removes in radioscopy image
Visual field absent region.As a result, can be quickly obtained and ignore without all calculating pruning region when being moved to new FDD every time
The radioscopy image of field absent region.In addition, the FDD about unregistered pruning region, is carried out in geometry by control FDD
It inserts, also can obtain correct pruning region with simple calculating.
[4. other embodiments]
The present invention is not limited to the embodiments, can will constitute within the scope of its spirit in implementation phase
Deformed element embodies.In addition, can be by multiple suitable combinations for constituting element disclosed in the embodiment come shape
At various inventions.For example, it is also possible to remove several composition elements from all compositions element shown in embodiment.In turn,
It can also will spread the composition element proper combination of different embodiments.Specifically, also comprising other following embodiment party
Formula.
(1) X-ray tube 1, workbench 2 and X-ray detector 3 remove arranged side by side in parallel with the mounting surface of X ray checking device
Other than setting, it can be set side by side in vertical direction.
(2) X-ray detector 3 is not limited to the plate orthogonal with the optical axis of X-ray, be also possible to have pass through X
Curved light receiving surface person is carried out centered on the vertical axis of radiation.
(3) in the first embodiment, with third embodiment it is equally possible that in the position that visual field significantly lacks
The position that is not lacked with visual field, position (can be multiple positions) photographs air between the two radioscopy image, find out
The region trimmed simultaneously is registered in storage unit 9.In the case, the region of trimming corresponds to geometry system and is increased and decreased, therefore
The pruning region of position about the radioscopy image for not shooting air, the position FDD of the camera site by compareing workpiece W
It sets and interpolation is carried out to the registered pruning region in storage unit 9 to find out.
The explanation of symbol
1:X ray tube
2: workbench
3:X ray detector
4: shift mechanism
5: control unit
6: input unit
7: pruning modes portion
71: image acquiring unit
72: average brightness value calculation part
73: visual field absent region determination unit
74: boundary finishing portion
75: trimmed image acquisition unit
76: setting value acquisition unit
77: benchmark range of exposures calculation part
78: camera site range of exposures calculation part
79: pruning region calculation part
8: reconstructing processing unit
9: storage unit
Claims (4)
1. a kind of X ray checking device is the irradiation source for including X-ray, loads the workbench of inspection object and receives transmission
The X-ray of inspection object simultaneously detects it through the X ray checking device of X-ray detector of image, which is characterized in that packet
It includes:
Shift mechanism moves the X-ray detector along the optical axis of X-ray；
Control unit controls the movement of the X-ray detector using the shift mechanism；
Image acquiring unit, obtained from the X-ray detector for determine the benchmark image of visual field absent region with as repairing
The image of the inspection object for the object cut；
Average brightness value calculation part, the average brightness value of the image without visual field missing in calculating benchmark image；
Visual field absent region determination unit will have the less than average brightness value to calculate for captured radioscopy image
The pixel of the brightness of the threshold value of portion's average brightness value calculated is determined as visual field absent region；
Trimmed image acquisition unit obtains visual field absent region determination unit institute from the shooting resulting image of inspection object
Image of the radioscopy image as pruning region other than the visual field absent region of judgement；And
Processing unit is reconstructed, according to the radioscopy image of pruning region acquired in the trimmed image acquisition unit, is reconstructed
CT image.
2. X ray checking device according to claim 1, including boundary finishing portion, the boundary finishing portion is examined from shooting
It looks into the resulting image of object, the visual field absent region and visual field determined visual field absent region determination unit lacks area
It is modified on the boundary in the region other than domain.
3. a kind of X ray checking device is the irradiation source for including X-ray, loads the workbench of inspection object and receives transmission
The X-ray of inspection object simultaneously detects it through the X ray checking device of X-ray detector of image, which is characterized in that packet
It includes:
Shift mechanism moves the X-ray detector along the optical axis of X-ray；
Control unit controls the movement of the X-ray detector using the shift mechanism；
Image acquiring unit, obtained from the X-ray detector for determine the benchmark image of visual field absent region with as repairing
The image of the inspection object for the object cut；
Setting value acquisition unit reads in following data that user is previously entered；
(1) roentgenogram firing angle (α)
(2) detector spacing (mm/ detector channel)
(3) benchmark focus is to detector distance (L1)
Benchmark range of exposures calculation part, according to the roentgenogram firing angle (α) as acquired in the setting value acquisition unit and benchmark focus
To detector distance (L1), the range of exposures of benchmark focus to detector distance (L1) is asked as benchmark range of exposures (W1)
Out；
Camera site range of exposures calculation part is obtained according to by the setting value acquisition unit and the benchmark range of exposures calculation part
The value taken finds out the range of exposures (W2) of arbitrary focus to detector distance (L2) by following formulas 1；
Formula 1: want the range of exposures (W2) found out=benchmark range of exposures (W1) × (arbitrary focus to detector distance
(L2)/benchmark focus to detector distance (L1))
Pruning region calculation part calculates irradiation calculated by the camera site range of exposures calculation part by following formulas 2
Range (W2) is equivalent to several channels of detector, and finds out pruning region；
Formula 2: pruning region=arbitrary range of exposures (W2)/detector spacing (mm/ detector of the focus into detector distance
Channel)
Trimmed image acquisition unit obtains the pruning region calculation part and is calculated from the shooting resulting image of inspection object
Pruning region radioscopy image；And
Processing unit is reconstructed, according to the radioscopy image of pruning region acquired in the trimmed image acquisition unit, is reconstructed
Computed tomography images.
4. X ray checking device according to claim 3, including storage unit, the storage unit is by the pruning region meter
Multiple focuses calculated by calculation portion are stored to pruning region and each focus of detector distance to detector distance foundation is corresponding,
And
The focus at the shooting position of trimmed image acquisition unit check and inspection object is read from storage unit pair to detector distance
The pruning region answered, and obtain the radioscopy image of pruning region.
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| JP2017078459A JP6843683B2 (en) | 2017-04-11 | 2017-04-11 | X-ray inspection equipment |
| JP2017-078459 | 2017-04-11 | ||
| PCT/JP2018/011217 WO2018190092A1 (en) | 2017-04-11 | 2018-03-20 | X-ray inspection device |
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| WO2021185242A1 (en) * | 2020-03-17 | 2021-09-23 | 同方威视技术股份有限公司 | Detector module, detector device and inspection device |
| CN113884517A (en) * | 2020-07-03 | 2022-01-04 | 欧姆龙株式会社 | X-ray inspection apparatus |
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| WO2018190092A1 (en) | 2018-10-18 |
| JP2018179711A (en) | 2018-11-15 |
| CN110383051B (en) | 2022-07-05 |
| JP6843683B2 (en) | 2021-03-17 |
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