CN107192726A - The quick high-resolution 3 D cone-beam computer tomography method of plate shell object and device - Google Patents
The quick high-resolution 3 D cone-beam computer tomography method of plate shell object and device Download PDFInfo
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Abstract
The invention discloses a kind of quick high-resolution 3 D cone-beam computer tomography method of plate shell object and device, this method includes：Obtain two-dimensional projection's sequence that detector is collected；Logarithm demodulation is carried out to the two-dimensional projection image sequence and obtains two-dimensional line integral image sequence；Object dimensional CT sectioning images are obtained using image reconstruction is carried out to two-dimensional line integral image sequence with azimuthal novel three-dimensional filter back-projection reconstruction algorithm.The embodiment of the present invention can effectively reduce reconstruction volume compared to existing plate shell CT scan technology, so as to improve reconstruction efficiency；The CT faultage images reconstructed, without being operated by image rotation and space interpolation etc., complete the matching of coordinate system and plate shell object three-dimensional orthogonal anatomical structure can be achieved, reach smooth vertical and horizontal visual effect, image processing time is not only saved, reconstructed image quality is improved, and enhances the readability of image.
Description
Technical field
The present embodiments relate to X ray computer chromatography imaging technique field, more particularly to a kind of plate shell object are quick
High-resolution 3 D cone-beam computer tomography method and device.
Background technology
In X ray computer tomography (Computed Tomography, abbreviation CT) system, x-ray source sends X
Ray, from different perspectives through a certain region of object to be detected, the detector for being positioned over radiographic source opposite connects in respective angles
Receive.Then, the decay according to each angle ray in various degree, carries out computing using certain algorithm for reconstructing and computer, rebuilds
Go out the ray line attenuation coefficient distribution map image that object is scanned region, so as to realize reconstructing image from projection, nondestructively again
The features such as existing Media density, composition and structural form of the object in the region.
It is the imaging indicators that current CT technologies are paid close attention to rebuild efficiency, reconstruction precision and three-dimensional visualization complexity.
Restricted by image-forming principle, solar energy sailboard, circuit board etc. have the plate shell object of large area-thickness ratio, traditional CT technology
It is difficult to obtain good reconstructed results.
In recent years, Helfen L etc., On the implementation of computed laminography using
Synchrotron radiation, Review of Scientific Instruments, vol.82, No.6, pp:129-
151,2011, realize a kind of dip sweeping CT imaging techniques (Computed specifically designed for plate and shell structure
Laminography, abbreviation CL), can preferably it solve the above problems.But there is also following limitation for the technology：Put down when tilting turntable
When face injustice or plate shell object surface projecting feature cause principal plane can not be fitted with turntable plane, CL sections are difficult to and plate shell
Surface is parallel, the problems such as causing low reconstruction time length, reconstruction precision and difficult three-dimensional visualization.
At present, it is not yet found that the plate shell X ray computer chromatography imaging technique of above mentioned problem can be overcome.
The content of the invention
The embodiment of the present invention provides a kind of quick high-resolution 3 D cone-beam computer tomography method of plate shell object and dress
Put, rebuild volume to reduce plate shell object CT, improve imaging efficiency and reconstruction precision, strengthen image readability.
The one side of the embodiment of the present invention is to provide a kind of quick high-resolution 3 D cone-beam Computerized chromatographic of plate shell object
Imaging method, comprises the following steps：
The two-dimensional projection image sequence that step 1, acquisition detector are collected, the two-dimensional projection image sequence is object edge
During axial rotation, the multiple two dimensions obtained after the ray projection of the excessively described object of detector periodicity acquisition of transmission
Projected image, and the two-dimensional projection image of sampling period one object of correspondence；
Step 2, to the two-dimensional projection image sequence carry out logarithm demodulation obtain two-dimensional line integral image sequence；Utilize band
Azimuthal novel three-dimensional filter back-projection reconstruction algorithm carries out image reconstruction to two-dimensional line integral image sequence, obtains the thing
The corresponding three dimensional CT sectioning image of body.
Further, step 1 also includes：Plate shell object be positioned over inclination turntable on, in scanning process plate shell object with
Turntable to rotate and rotate；
360 degree of pivot uniform rotation of the plate shell object along rotary shaft, and the imaging area quilt in rotation process
Cone-beam is covered.
Further, it is described that logarithm demodulation acquisition two-dimensional line integral image sequence is carried out to the two-dimensional projection image sequence
Row, including：
Logarithm demodulation is carried out to the two-dimensional projection image sequence I (i, m, n) according to formula (1) and obtains two-dimensional line integrogram
As sequence p (i, m, n)：
Wherein, i represents scanning angle, and (m, n) represents two coordinates of the detection channels in the vertical plane of the detector,
Ln represents natural logrithm computing, and mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get K, I from 1
(i,1:10,1:K) represent that width is 10, is highly K area in i-th of two-dimensional projection image in the two-dimensional projection image sequence
Domain.
Further, it is described using corresponding to the plate shell object with azimuthal new filter back-projection reconstruction algorithm
Two-dimensional line integral image sequence carries out image reconstruction and obtains the corresponding three dimensional CT sectioning image of the plate shell object, including：
Image reconstruction acquisition is carried out to the corresponding two-dimensional line integral image sequence of the plate shell object according to formula (2)-(6)
The three dimensional CT sectioning image f of the plate shell object：
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents that three-dimensional body particle exists
Coordinate position in object coordinates system, (x, y, z) represents three-dimensional body particle under some anglec of rotation in system coordinate system
Coordinate position, D represents radiographic source to the distance of detector, and p (s, v, β) represents the two-dimensional line product obtained after logarithm demodulation
Partial image sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to
Projection address on two-dimensional line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device, α,γ distinguishes characterization board shell
Angle between three main shafts of object and three-dimensional cartesian rectangular coordinate system.
The other side of the embodiment of the present invention is to provide a kind of quick high-resolution 3 D cone-beam computer layer of plate shell object
Imaging device is analysed, including：
Acquisition module, for obtaining the two-dimensional projection image sequence that detector is collected, the two-dimensional projection image sequence
It is object axially in rotation process, is obtained after the ray projection of the excessively described object of detector periodicity acquisition of transmission
Multiple two-dimensional projection images, and the two-dimensional projection image of sampling period one object of correspondence；
Computing module, two-dimensional line integral image sequence is obtained for carrying out logarithm demodulation to the two-dimensional projection image sequence
Row；Image reconstruction is carried out to two-dimensional line integral image sequence using with azimuthal novel three-dimensional filter back-projection reconstruction algorithm,
Obtain the corresponding three dimensional CT sectioning image of the object.
Further, acquisition module also includes：Plate shell object is positioned on inclination turntable, the plate shell object in scanning process
Rotated as turntable is rotated；
360 degree of pivot uniform rotation of the plate shell object along rotary shaft, and the imaging area quilt in rotation process
Cone-beam is covered.
Further, the computing module specifically for according to formula (1) to the two-dimensional projection image sequence I (i, m,
N) carry out logarithm demodulation and obtain two-dimensional line integral image sequence p (i, m, n)：
Wherein, i represents scanning angle, and (m, n) represents two coordinates of the detection channels in the vertical plane of the detector,
Ln represents natural logrithm computing, and mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get K, I from 1
(i,1:10,1:K) represent that width is 10, is highly K area in i-th of two-dimensional projection image in the two-dimensional projection image sequence
Domain.
Further, the computing module is specifically for according to two-dimensional line integrogram of formula (2)-(6) to the object
As sequence carries out the three dimensional CT sectioning image f that image reconstruction obtains the object：
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents that three-dimensional body particle exists
Coordinate position in object coordinates system, (x, y, z) represents three-dimensional body particle under some anglec of rotation in system coordinate system
Coordinate position, D represents radiographic source to the distance of detector, and p (s, v, β) represents the two-dimensional line product obtained after logarithm demodulation
Partial image sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to
Projection address on two-dimensional line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device, α,γ distinguishes characterization board shell
Angle between three main shafts of object and three-dimensional cartesian rectangular coordinate system.
The advantage of the present invention compared with prior art is：The present invention can solve the problem that plate shell object in three-dimensional orthogonal Descartes
Azimuth problem under coordinate system, quick high accuracy directly reconstructs out the sectional slice image parallel to plate shell object surface；Step
It is rapid simple, reconstruction volume is reduced to improve reconstruction efficiency；Object space position is corrected during reconstruction, rather than
Image rotation and space interpolation are carried out to data again after rebuilding, without interpolation error, thus reconstructed image quality is improved；
Reconstruct the sectioning image come and show parallel with plate shell object, legibility is strong, three-dimensional visualization precision is high.
Brief description of the drawings
Fig. 1 is the quick high-resolution 3 D cone-beam computer tomography method stream of plate shell object provided in an embodiment of the present invention
Cheng Tu；
Fig. 2 is that the quick high-resolution 3 D cone-beam computerized tomography system of plate shell object provided in an embodiment of the present invention is former
Reason figure；
Fig. 3 is that plate shell object novel three-dimensional filter back-projection reconstruction algorithm provided in an embodiment of the present invention rebuilds coordinate system original
Reason figure；
Fig. 4 is that the actual object obtained using the quick high-resolution 3 D cone-beam computer tomography method of plate shell object is existed
Two-dimensional line integral image under some scanning angles；
Fig. 5 is the three-dimensional after the actual object obtained using plate shell object novel three-dimensional filter back-projection reconstruction algorithm is rebuild
CT images；
Fig. 6 is the three-dimensional CT image that the actual object obtained is rebuild using traditional reconstruction algorithm；
Fig. 7 is the quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object provided in an embodiment of the present invention
Structure chart.
Embodiment
Below in conjunction with the accompanying drawings and embodiment further illustrates the present invention.
Fig. 1 is the quick high-resolution 3 D cone-beam computer tomography method stream of plate shell object provided in an embodiment of the present invention
Cheng Tu；The embodiment of the present invention for existing plate shell object CT be imaged, sectioning image be difficult to it is parallel with plate shell surface, cause rebuild when
Between long, reconstruction precision is low and there is provided the plate based on new filter back-projection reconstruction algorithm the problems such as difficult three-dimensional visualization
The quick high-resolution 3 D cone-beam computer tomography method of shell object, this method is comprised the following steps that：
The two-dimensional projection image sequence that step S101, acquisition detector are collected, the two-dimensional projection image sequence is thing
Body is axially in rotation process, and what is obtained after the ray projection of the excessively described object of detector periodicity acquisition of transmission is multiple
Two-dimensional projection image, and the two-dimensional projection image of sampling period one object of correspondence.
Fig. 2 is that the quick high-resolution 3 D cone-beam computerized tomography system of plate shell object provided in an embodiment of the present invention is former
Reason figure；As shown in Fig. 2 plate and shell structure 3 D cone-beam computerized tomography system includes：X-ray source 20, X-ray beam 21, incline
Oblique turntable 22, board under test shell object 23, detector 24, computer 25.Wherein, board under test shell object 23 is placed on inclination turntable 22
On, detector 24, inclination turntable 22 and x-ray source 20 are connected with computer 25 respectively.Computer 25 is used to control x-ray source 20
The intensity and time, control for occurring cone-beam tilt the velocity of rotation of turntable 22, and control the sampling period of detector 24.X-ray
The measuring targets 23 of cone-beam 21 that source 20 is formed are transmitted, and the imaging area of object under test 23 is covered by cone-beam 21, and turntable 22 is at the uniform velocity
Axially rotate, the periodicity acquisition of transmission of detector 24 crosses the ray projection of object under test 23, after turntable 22 rotates 360 °,
The control detector 24 of computer 25 stops sampling, the control stopping of x-ray source 20 and occurs cone-beam, while controlling turntable 22 to stop turning
Dynamic, whole 3 D cone-beam computerized tomography system completes once single circular orbit cone-beam scan.Detector 24 will each sample
Ray projection one two-dimensional projection image of formation that cycle collects, and two-dimensional projection image is transferred to computer 25, then turn
Platform 22 is rotated after 360 °, and detector 24 forms a series of two-dimensional projection images i.e. two-dimensional projection image sequence, and by two-dimensional projection
Image sequence is transferred to computer 25.Fig. 3 rebuilds for plate shell object novel three-dimensional filtered back projection provided in an embodiment of the present invention
Algorithm rebuilds coordinate system schematic diagram.
It is preferred that, the object is axially rotated, including：Pivot uniform rotation of the object along rotary shaft
360 degree, and image objects area is covered by cone-beam described in rotation process；The sampling period of the detector can flexibly set
It is fixed, it is preferred that the sampling period is the time of the object axially 1 degree of uniform rotation.
In addition, the embodiment of the present invention does not limit the sampling period of detector 24.
Step S102, to the two-dimensional projection image sequence carry out logarithm demodulation obtain two-dimensional line integral image sequence.
The two-dimensional projection image sequence that computer 25 is collected to the detector that it is obtained carries out logarithm demodulation and obtains two dimension
Line integral image sequence, is specially to carry out logarithm demodulation to the two-dimensional projection image sequence I (i, m, n) according to formula (1) to obtain
Obtain two-dimensional line integral image sequence p (i, m, n)：
Wherein, i represents scanning angle, axially at the uniform velocity turns simultaneously for the multiple object when the sampling period of detector
When moving 1 degree of time, i value is that (m, n) represents two of the detection channels in the vertical plane of the detector from 1 to 360
Coordinate, ln represents natural logrithm computing, and mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get from 1
K, I (i, 1:10,1:K) represent that width is 10, is highly K in i-th of two-dimensional projection image in the two-dimensional projection image sequence
Region.
Step S103, using with azimuthal new filter back-projection reconstruction algorithm to the corresponding two dimension of the plate shell object
Line integral image sequence carries out image reconstruction and obtains the corresponding three dimensional CT sectioning image of the plate shell object.Specially according to formula
(2)-(6) two-dimentional line integral subimage sequence p corresponding to the plate shell object carries out image reconstruction and obtains the plate shell object
Corresponding three dimensional CT sectioning image f：
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents that three-dimensional body particle exists
Coordinate position in object coordinates system, (x, y, z) represents three-dimensional body particle under some anglec of rotation in system coordinate system
Coordinate position, D represents radiographic source to the distance of detector, and p (s, v, β) represents the two-dimensional line product obtained after logarithm demodulation
Partial image sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to
Projection address on two-dimensional line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device.α,γ is carried in the present invention
Angle between the three important angle parameters gone out, three main shafts of characterization board shell object and three-dimensional cartesian rectangular coordinate system.
The embodiment of the present invention is compared to existing Cone-Beam CT, CL technologies, and step is simple, reduces reconstruction volume to improve
Reconstruction efficiency；Object space position is corrected during reconstruction, rather than is rebuild later again to data progress image rotation
And space interpolation, without interpolation error, thus improve reconstructed image quality；Reconstruct the sectioning image and plate shell object come
Show parallel, legibility is strong, three-dimensional visualization precision is high.
In order to prove the effect of above-described embodiment, the embodiment of the present invention has carried out following experiment, and experimental procedure is as follows：
(1) experiment condition is set.The plate shell object that this experiment is used is the PCB printed circuit board (PCB) of two layers.The printing
Circuit board has the characteristic feature of plate shell object, and with features such as many cavities, solder joint, circuits on each layer of the circuit board.X
Radiographic source specifically uses X-ray tube, and the tube voltage of the X-ray tube is 110KV, and tube current is 1.5mA, x-ray source to detector
Distance be 1180mm, the angular samples number of detector is 360, and the size of two-dimensional projection image is 960*768.
(2) according to setup parameter, computer control tilts turntable and rotated, detector acquired projections data, and according to projection
Data generate two-dimensional projection image sequence.
(3) computer carries out logarithm demodulation to two-dimensional projection image sequence according to above-mentioned formula (1) and obtains two-dimentional line integral
Image sequence.
(4) computer is carried out according to above-mentioned formula (2)-(6) to the corresponding two-dimensional line integral image sequence of the plate shell object
Image reconstruction obtains the corresponding three dimensional CT sectioning image of the object.
Fig. 4 is that the actual object obtained using the quick high-resolution 3 D cone-beam computer tomography method of plate shell object is existed
Two-dimensional line integral image under some scanning angles；Fig. 5 is to be obtained using plate shell object novel three-dimensional filter back-projection reconstruction algorithm
Three-dimensional CT image after the actual object reconstruction obtained.From Figure 4 and 5, CT images correctly disclose the PCB printed circuit board (PCB)s
Structure, indicates the validity of present invention method.Meanwhile, it is observed that reconstructed with present invention method come
Circuit board tomography " smooth vertical and horizontal ", it is parallel with plate shell object surface, it is very intuitively, readable strong.
Fig. 6 is the three-dimensional CT image that the actual object obtained is rebuild using traditional reconstruction algorithm.Can significantly it be seen by Fig. 6
Observe, because traditional algorithm does not account for the folder existed between plate shell object and each main shaft of three-dimensional cartesian rectangular coordinate system
Angle, therefore the object tomography reconstructed is not parallel with circuit board surface, there is obvious angle so that reconstruction image can not intuitively, have
The information of the validity response circuit board.
From Fig. 4,5 and 6, realize the three-dimensional tomography of plate shell object energy quick high accuracy of the embodiment of the present invention,
Directly reconstruct out the subject image of " smooth vertical and horizontal ", it is not necessary to which successive image rotates the process of interpolation, rebuild efficiency high, rebuild essence
Degree is high, and three-dimensional visualization effect is good.Algorithm for reconstructing implementation process is simply easily realized.
Fig. 7 is the quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object provided in an embodiment of the present invention
Structure chart.The quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object provided in an embodiment of the present invention can be performed
The handling process that the 3 D cone-beam computer tomography method embodiment of plate shell object is provided, as shown in fig. 7, for plate shell thing
Body 3 D cone-beam computer laminated imaging device 70 includes acquisition module 71 and computing module 72, wherein, acquisition module 71 is used for
The two-dimensional projection image sequence that detector is collected is obtained, the two-dimensional projection image sequence is that the plate shell object turns along inclination
During platform axial rotation, what is obtained after the ray projection of the excessively described plate shell object of detector periodicity acquisition of transmission is multiple
Two-dimensional projection image, and the two-dimensional projection image of sampling period one plate shell object of correspondence；Computing module 72 is used for
Logarithm demodulation is carried out to the two-dimensional projection image sequence and obtains two-dimensional line integral image sequence, is proposed using the embodiment of the present invention
The azimuthal new filter back-projection reconstruction algorithm of band to the corresponding two-dimensional line integral image sequence of the plate shell object carry out
Image reconstruction obtains the corresponding three dimensional CT sectioning image of the plate shell object.
The embodiment of the present invention is compared to existing Cone-Beam CT, CL technologies, and step is simple, reduces reconstruction volume to improve
Reconstruction efficiency；Object space position is corrected during reconstruction, rather than is rebuild later again to data progress image rotation
And space interpolation, without interpolation error, thus improve reconstructed image quality；Reconstruct the sectioning image and plate shell object come
Show parallel, legibility is strong, three-dimensional visualization precision is high.
On the basis of above-described embodiment, pivot uniform rotation 360 degree of the plate shell object along inclination turntable,
And image objects area is covered by cone-beam described in rotation process；The sampling period of the detector can flexibly set, preferably
, the sampling period is the time of the plate shell object axially 1 degree of uniform rotation.
Computing module 72 to the two-dimensional projection image sequence I (i, m, n) according to formula (1) specifically for carrying out logarithm solution
Adjust and obtain two-dimensional line integral image sequence p (i, m, n)：
Wherein, i represents scanning angle, and (m, n) represents two coordinates of the detection channels in the vertical plane of the detector,
Ln represents natural logrithm computing, and mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get K, I from 1
(i,1:10,1:K) represent that width is 10, is highly K area in i-th of two-dimensional projection image in the two-dimensional projection image sequence
Domain.
Computing module 72 is specifically for foundation above-mentioned formula (2)-(6) to the corresponding two-dimensional line integral image of the plate shell object
Sequence carries out image reconstruction and obtains the corresponding three dimensional CT sectioning image of the object.
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents that three-dimensional body particle exists
Coordinate position in object coordinates system, (x, y, z) represents three-dimensional body particle under some anglec of rotation in system coordinate system
Coordinate position, D represents radiographic source to the distance of detector, and p (s, v, β) represents the two-dimensional line product obtained after logarithm demodulation
Partial image sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to
Projection address on two-dimensional line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device.α,γ is carried in the present invention
Angle between the three important angle parameters gone out, three main shafts of characterization board shell object and three-dimensional cartesian rectangular coordinate system.
The quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object provided in an embodiment of the present invention can have
Body is used to perform the embodiment of the method that above-mentioned Fig. 1 is provided, and here is omitted for concrete function.
The three-dimensional tomography of plate shell object is realized energy quick high accuracy of the embodiment of the present invention, is directly reconstructed out " horizontal flat
Subject image vertically ", it is not necessary to which successive image rotates the process of interpolation, rebuilds efficiency and precision is high, three-dimensional visualization effect
Good, legibility is strong, and implementation process is simple.
In summary, the embodiment of the present invention is compared to existing imaging technique, and reconstruction image volume significantly reduces, and saves
Conventional method is used for the reality for rebuilding nonsensical volume of air, improves reconstruction efficiency；Successive image rotation is not needed to entangle
Positive object space, does not produce interpolation error, so as to improve CT picture qualities, simplifies three-dimensional visualization process.
, can be by it in several embodiments provided by the present invention, it should be understood that disclosed apparatus and method
Its mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, only
Only a kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can be tied
Another system is closed or is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed
Coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLINGs or logical of device or unit by some interfaces
Letter connection, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are to cause a computer
Equipment (can be personal computer, server, or network equipment etc.) or processor (processor) perform the present invention each
The part steps of embodiment methods described.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
Can be with the medium of store program codes.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each functional module
Division progress for example, in practical application, can distribute complete by different functional modules by above-mentioned functions as needed
Into the internal structure of device being divided into different functional modules, to complete all or part of function described above.On
The specific work process of the device of description is stated, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of quick high-resolution 3 D cone-beam computer tomography method of plate shell object, it is characterised in that including following step
Suddenly：
Step 1, obtain the two-dimensional projection image sequence that collects of detector, the two-dimensional projection image sequence is object along axle
Into rotation process, the multiple two-dimensional projections obtained after the ray projection of the excessively described object of detector periodicity acquisition of transmission
Image, and the two-dimensional projection image of sampling period one object of correspondence；
Step 2, to the two-dimensional projection image sequence carry out logarithm demodulation obtain two-dimensional line integral image sequence；Utilize band orientation
The novel three-dimensional filter back-projection reconstruction algorithm at angle carries out image reconstruction to two-dimensional line integral image sequence, obtains the object pair
The three dimensional CT sectioning image answered.
2. the quick high-resolution 3 D cone-beam computer tomography method of plate shell object according to claim 1, its feature
It is, step 1 also includes：Plate shell object is positioned on inclination turntable, and plate shell object is with turntable rotation in scanning process
Rotate；
360 degree of pivot uniform rotation of the plate shell object along rotary shaft, and in rotation process imaging area by cone-beam
Covering.
3. the quick high-resolution 3 D cone-beam computer tomography method of plate shell object according to claim 2, its feature
It is, the logarithm that carried out to the two-dimensional projection image sequence demodulates acquisition two-dimensional line integral image sequence, including：
Logarithm demodulation is carried out to the two-dimensional projection image sequence I (i, m, n) according to formula (1) and obtains two-dimensional line integral image sequence
Arrange p (i, m, n)：
<mrow>
<mi>p</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mi>m</mi>
<mo>,</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>m</mi>
<mi>e</mi>
<mi>a</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>I</mi>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mn>1</mn>
<mo>:</mo>
<mn>10</mn>
<mo>,</mo>
<mn>1</mn>
<mo>:</mo>
<mi>K</mi>
<mo>)</mo>
</mrow>
<mo>)</mo>
</mrow>
<mrow>
<mi>I</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mi>m</mi>
<mo>,</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, i represents scanning angle, and (m, n) represents two coordinates of the detection channels in the vertical plane of the detector, ln tables
Show natural logrithm computing, mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get K, I (i, 1 from 1:
10,1:K) represent that width is 10, is highly K region in i-th of two-dimensional projection image in the two-dimensional projection image sequence.
4. the quick high-resolution 3 D cone-beam computer tomography method of plate shell object according to claim 3, its feature
It is, it is described to use with azimuthal new filter back-projection reconstruction algorithm to the corresponding two-dimensional line integrogram of the plate shell object
The corresponding three dimensional CT sectioning image of the plate shell object is obtained as sequence carries out image reconstruction, including：
Image reconstruction is carried out to the corresponding two-dimensional line integral image sequence of the plate shell object according to formula (2)-(6) and obtains described
The three dimensional CT sectioning image f of plate shell object：
<mrow>
<mi>f</mi>
<mrow>
<mo>(</mo>
<msup>
<mi>x</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
</msup>
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<msup>
<mi>y</mi>
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<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
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</mrow>
<mo>=</mo>
<msubsup>
<mo>&Integral;</mo>
<mn>0</mn>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</msubsup>
<mfrac>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mi>D</mi>
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<mi>y</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mfrac>
<mrow>
<mo>(</mo>
<mi>p</mi>
<mo>(</mo>
<mrow>
<mi>s</mi>
<mo>,</mo>
<mi>v</mi>
<mo>,</mo>
<mi>&beta;</mi>
</mrow>
<mo>)</mo>
<mfrac>
<mi>D</mi>
<msqrt>
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<msup>
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</msup>
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</msup>
</mrow>
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</mfrac>
<mo>*</mo>
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</mrow>
</mrow>
<mrow>
<mfenced open = "(" close = ")">
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<mtd>
<mi>s</mi>
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<mtr>
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<mi>v</mi>
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</mtable>
</mfenced>
<mo>=</mo>
<mrow>
<mo>(</mo>
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<mi>D</mi>
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<mi>y</mi>
</mrow>
</mfrac>
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</mrow>
<mfenced open = "(" close = ")">
<mtable>
<mtr>
<mtd>
<mi>x</mi>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>z</mi>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents three-dimensional body particle in object
Coordinate position in coordinate system, (x, y, z) represents seat of the three-dimensional body particle under some anglec of rotation in system coordinate system
Cursor position, D represents radiographic source to the distance of detector, the two-dimensional line integrogram obtained after p (s, v, β) expression progress logarithm demodulation
As sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to two dimension
Projection address on line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device, α,γ distinguishes characterization board shell object
With the angle between three main shafts of three-dimensional cartesian rectangular coordinate system.
5. a kind of quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object, it is characterised in that including：
Acquisition module, for obtaining the two-dimensional projection image sequence that detector is collected, the two-dimensional projection image sequence is thing
Body is axially in rotation process, and what is obtained after the ray projection of the excessively described object of detector periodicity acquisition of transmission is multiple
Two-dimensional projection image, and the two-dimensional projection image of sampling period one object of correspondence；
Computing module, two-dimensional line integral image sequence is obtained for carrying out logarithm demodulation to the two-dimensional projection image sequence；Profit
Image reconstruction is carried out to two-dimensional line integral image sequence with azimuthal novel three-dimensional filter back-projection reconstruction algorithm, institute is obtained
State the corresponding three dimensional CT sectioning image of object.
6. the quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object according to claim 5, its feature
It is, acquisition module also includes：Plate shell object is positioned on inclination turntable, and plate shell object is rotated with turntable in scanning process
And rotate；
360 degree of pivot uniform rotation of the plate shell object along rotary shaft, and in rotation process imaging area by cone-beam
Covering.
7. the quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object according to claim 6, its feature
It is, the computing module to the two-dimensional projection image sequence I (i, m, n) according to formula (1) specifically for carrying out logarithm solution
Adjust and obtain two-dimensional line integral image sequence p (i, m, n)：
<mrow>
<mi>p</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mi>m</mi>
<mo>,</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>m</mi>
<mi>e</mi>
<mi>a</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>I</mi>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mn>1</mn>
<mo>:</mo>
<mn>10</mn>
<mo>,</mo>
<mn>1</mn>
<mo>:</mo>
<mi>K</mi>
<mo>)</mo>
</mrow>
<mo>)</mo>
</mrow>
<mrow>
<mi>I</mi>
<mrow>
<mo>(</mo>
<mi>i</mi>
<mo>,</mo>
<mi>m</mi>
<mo>,</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, i represents scanning angle, and (m, n) represents two coordinates of the detection channels in the vertical plane of the detector, ln tables
Show natural logrithm computing, mean represents two-dimentional mean operation, 1:10 represent to get 10,1 from 1:K represents to get K, I (i, 1 from 1:
10,1:K) represent that width is 10, is highly K region in i-th of two-dimensional projection image in the two-dimensional projection image sequence.
8. the quick high-resolution 3 D cone-beam computer laminated imaging device of plate shell object according to claim 7, its feature
It is, the computing module according to formula (2)-(6) to the two-dimensional line integral image sequence of the object specifically for scheming
The three dimensional CT sectioning image f of the object is obtained as rebuilding：
<mrow>
<mi>f</mi>
<mrow>
<mo>(</mo>
<msup>
<mi>x</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
</msup>
<mo>,</mo>
<msup>
<mi>y</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
</msup>
<mo>,</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
</mrow>
</msup>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msubsup>
<mo>&Integral;</mo>
<mn>0</mn>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</msubsup>
<mfrac>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mi>D</mi>
<mo>-</mo>
<mi>y</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mfrac>
<mrow>
<mo>(</mo>
<mi>p</mi>
<mo>(</mo>
<mrow>
<mi>s</mi>
<mo>,</mo>
<mi>v</mi>
<mo>,</mo>
<mi>&beta;</mi>
</mrow>
<mo>)</mo>
<mfrac>
<mi>D</mi>
<msqrt>
<mrow>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mi>s</mi>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mfrac>
<mo>*</mo>
<mi>h</mi>
<mo>(</mo>
<mi>s</mi>
<mo>)</mo>
<mo>/</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>&beta;</mi>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mfenced open = "(" close = ")">
<mtable>
<mtr>
<mtd>
<mi>s</mi>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>v</mi>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>D</mi>
<mrow>
<mi>D</mi>
<mo>-</mo>
<mi>y</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mfenced open = "(" close = ")">
<mtable>
<mtr>
<mtd>
<mi>x</mi>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>z</mi>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
X=(x " cos α+(and y " sin α+z " cos α) sin γ) cos β-(y " cos α-z " sin α) sin β (4)
Wherein, f (x ", y ", z ") represents reconstructed three dimensional panel shell object, and (x ", y ", z ") represents three-dimensional body particle in object
Coordinate position in coordinate system, (x, y, z) represents seat of the three-dimensional body particle under some anglec of rotation in system coordinate system
Cursor position, D represents radiographic source to the distance of detector, the two-dimensional line integrogram obtained after p (s, v, β) expression progress logarithm demodulation
As sequence, (s, v) represents coordinate position of certain pixel in two dimensional image coordinate system, and corresponding three-dimensional object particle is mapped to two dimension
Projection address on line integral image, β represents the anglec of rotation, and h (s) is one-dimensional filtering device, α,γ distinguishes characterization board shell object
With the angle between three main shafts of three-dimensional cartesian rectangular coordinate system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796835A (en) * | 2017-10-20 | 2018-03-13 | 北京航空航天大学 | A kind of X ray cylinder 3 D cone-beam computer tomography method and device |
| CN108680589A (en) * | 2018-05-31 | 2018-10-19 | 北京航空航天大学 | X-ray grating differential phase contrast 3 D cone-beam computer tomography method based on transversion malposition grating and device |
| CN109325428A (en) * | 2018-09-05 | 2019-02-12 | 周军 | Mankind's activity gesture recognition method based on multi-level end-to-end neural network |
| CN110660123A (en) * | 2018-06-29 | 2020-01-07 | 清华大学 | Three-dimensional CT image reconstruction method and device based on neural network and storage medium |
| CN111462266A (en) * | 2020-03-20 | 2020-07-28 | 北京东软医疗设备有限公司 | Image reconstruction method and device, CT (computed tomography) equipment and CT system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718719A (en) * | 2009-12-01 | 2010-06-02 | 北京航空航天大学 | Method for determining angle increment of 3D cone-beam industry CT through continuous scan |
| CN102004111A (en) * | 2010-09-28 | 2011-04-06 | 北京航空航天大学 | CT imaging method using tilted multi-cone-beam linear track |
| CN103489206A (en) * | 2013-09-25 | 2014-01-01 | 华南理工大学 | Hybrid filtering method based on fan-beam X-ray CT filtering back-projection resetting |
| CN103698401A (en) * | 2013-12-23 | 2014-04-02 | 电子科技大学 | Tomography method for lamb waves within any convex region |
| CN105717145A (en) * | 2016-02-03 | 2016-06-29 | 北京航空航天大学 | Multi-mounted three-dimensional cone beam computer tomography method and device |
-
2017
- 2017-05-05 CN CN201710312113.9A patent/CN107192726B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718719A (en) * | 2009-12-01 | 2010-06-02 | 北京航空航天大学 | Method for determining angle increment of 3D cone-beam industry CT through continuous scan |
| CN102004111A (en) * | 2010-09-28 | 2011-04-06 | 北京航空航天大学 | CT imaging method using tilted multi-cone-beam linear track |
| CN103489206A (en) * | 2013-09-25 | 2014-01-01 | 华南理工大学 | Hybrid filtering method based on fan-beam X-ray CT filtering back-projection resetting |
| CN103698401A (en) * | 2013-12-23 | 2014-04-02 | 电子科技大学 | Tomography method for lamb waves within any convex region |
| CN105717145A (en) * | 2016-02-03 | 2016-06-29 | 北京航空航天大学 | Multi-mounted three-dimensional cone beam computer tomography method and device |
Non-Patent Citations (1)
| Title |
|---|
| FU JIAN 等: "Large field of view computed laminography with the asymmetric rotational scanning geometry", 《SCIENCE CHINA TECHNOLOGICAL SCIENCES》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796835A (en) * | 2017-10-20 | 2018-03-13 | 北京航空航天大学 | A kind of X ray cylinder 3 D cone-beam computer tomography method and device |
| CN107796835B (en) * | 2017-10-20 | 2021-05-25 | 北京航空航天大学 | X-ray cylindrical surface three-dimensional cone beam computer tomography method and device |
| CN108680589A (en) * | 2018-05-31 | 2018-10-19 | 北京航空航天大学 | X-ray grating differential phase contrast 3 D cone-beam computer tomography method based on transversion malposition grating and device |
| CN108680589B (en) * | 2018-05-31 | 2021-07-16 | 北京航空航天大学 | Three-dimensional cone beam computer tomography method and device based on transverse dislocation grating |
| CN110660123A (en) * | 2018-06-29 | 2020-01-07 | 清华大学 | Three-dimensional CT image reconstruction method and device based on neural network and storage medium |
| CN110660123B (en) * | 2018-06-29 | 2021-08-31 | 清华大学 | Three-dimensional CT image reconstruction method and device based on neural network and storage medium |
| CN109325428A (en) * | 2018-09-05 | 2019-02-12 | 周军 | Mankind's activity gesture recognition method based on multi-level end-to-end neural network |
| CN111462266A (en) * | 2020-03-20 | 2020-07-28 | 北京东软医疗设备有限公司 | Image reconstruction method and device, CT (computed tomography) equipment and CT system |
| CN111462266B (en) * | 2020-03-20 | 2023-08-04 | 北京东软医疗设备有限公司 | Image reconstruction method, device, CT equipment and CT system |
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