CN102232844B - CT device and image pickup method of CT device - Google Patents
CT device and image pickup method of CT device Download PDFInfo
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- CN102232844B CN102232844B CN2011101013927A CN201110101392A CN102232844B CN 102232844 B CN102232844 B CN 102232844B CN 2011101013927 A CN2011101013927 A CN 2011101013927A CN 201110101392 A CN201110101392 A CN 201110101392A CN 102232844 B CN102232844 B CN 102232844B
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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
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- 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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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
- G06T11/005—Specific pre-processing for tomographic reconstruction, e.g. calibration, source positioning, rebinning, scatter correction, retrospective gating
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- G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
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Abstract
The invention provides a CT device and an image pickup method of a CT device obtaining a section image of a checked body provided with a laminate construction with short tomography time. The CT device is provided with: a radioactive source (1) directed toward a checked body to radiate rays with the radioactive optical axis of a tomography surface as the center, the checked body is supported on an objective table (4) in a mode that the laminated constructed layer surface to be photographed crosses with the tomography surface; a radioactive ray detector (3) checking radioactive rays penetrating the objected body and outputting the radioactive rays as a transmission image; a rotating unit (7) making the objective table and the radioactive rays be in a relative rotation; a scanning control unit (9c) controlling the rotating unit (7) and the radioactive ray detector to perform such scanning; at the level surface of the objected body, a plurality of transmission images are preferably selected as scanning data for storage at the rotating angle close to parallel to the optical axis of the radioactive ray; and a rebuilding unit (9d) rebuilding at least one section image of the checked body parallel to the tomography surface.
Description
Technical field
The present invention relates to the computer tomography device that the section to subject looks like to photograph (below be recited as CT (Computed Tomography, computed tomography (CT)) device).
Background technology
In recent years, because of the practicability of development and the electric motor car of mobile devices such as portable phone, the expanded demand of secondary cells such as lithium ion battery or Ni-MH battery.Thereupon, it is more and more higher be used for to supply with the importance degree that the battery that can not produce the high battery of short circuit and safety on fire and reliability checks.Check that as this battery known have section to subject with bedded structure to look like the method for photographing to check.
At first, Fig. 7 illustrates the sketch map (profile) as the battery 90 of subject.This figure is the profile of summary that the structure of lithium battery, Ni-MH battery, Ni-Cr battery etc. is shown.Positive plate 92 and negative plate 93 are reeled multiple and are accommodated in the housing 91 across dividing plate (not shown), are full of electrolyte 94 in the space.For example Ceng spacing (positive plate-positive plate) is about 0.3mm, and the number of turns is tens circles, is of a size of about 30mm * 120mm as section integral body.
In order to check the battery of this structure, in the inspection of the battery that has used the CT device, section shown in Figure 7 is looked like to photograph, can confirm the fold of layer of battery lead plate (general name of positive plate 92 and negative plate 93) and interlayer every entanglement etc., can follow the trail of when using battery through the time change to check.
Put down in writing for the CT device in the past that in this battery inspection, uses.In CT device in the past, the lonizing radiation (X ray) that the CT device that is called as so-called RR (Rotate Rotate) mode (third generation mode) that only is rotated produces from radiation source towards the subject irradiation, subject is relatively rotated with respect to lonizing radiation with the rotating shaft that the optical axis direction with lonizing radiation intersects, utilization has the radiation detector of a plurality of detection channels of one dimension or two dimension, the predetermined anglec of rotation in turning around according to revolving of each detection detects the lonizing radiation from the subject transmission at interval, obtains section picture or the three-dimensional data of (carrying out tomography) subject according to this detector output.
As prior art, the structure of the CT device of 1 record of patent documentation shown in Fig. 8.This Fig. 8 (a) is vertical view, (b) is front view.In the drawings, X-ray tube 101 and X-ray detector 103 arranged opposite that the pyramidal X-ray beam 102 that produces from X-ray tube 101 detected with two-dimensional resolution, acquisition is to enter the transmission picture (transmission data) of the subject 105 of mode mounting on object stage 104 in this X-ray beam 102.
On the other hand, for the method for reconstruction process, under the situation of pyramidal X-ray beam, use the method for non-patent literature 1 record usually.This method be filtering proofread and correct back projection's method (FBP (and Filtered Back Projection: method filtered back projection)) a kind of, carry out back projection with three dimensional constitution.Section shown in Figure 8 is defined as the visual field (or being called scanning area) 110, and object stage 104 revolves the zone that is included in all the time during turning around in the X-ray beam 102 that is detected by detector 103 with respect to rotating shaft RA.Section is to be the zone of the roughly tubular of axle with rotating shaft RA as the visual field 110, is the zone that can not rebuild the section picture limpingly.In addition, when improving the photography multiplying power, section is inversely proportional to it as the visual field 110, diameter and highly diminishing.
But as record in the patent documentation 1, known have the part of amplification subject 105 to carry out the method for tomography (hereinafter referred to as ROI (Region of Interest: the target area) scanning.In this tomography, shown in Fig. 8 (a), with reduce section as the visual field 110, make the 105a of target portion of subject 105 be accommodated in this section just as the mode in the visual field 110 shift mechanism 109 and XY mechanism 104 to be positioned.Thus, can obtain the high amplification profile picture of spatial resolution of the 105a of target portion.In addition, by CT device in the past, can for example partly carry out section picture photography with high-resolution to the target of the layer structure of battery 90 by ROI scanning.
The prior art document:
Patent documentation 1: TOHKEMY 2002-310943 number
Non-patent literature 1:L.A.Feldkamp:L.C.Davis and J.W.Kress, Practicalcone-beam algorithm, J.Opt.Soc.Am.A/Vol.1, No.6/June1984
Yet when the subject that battery etc. is had bedded structure carried out tomography, the anglec of rotation that need reduce to detect in the rotary course transmission picture is (sampling interval of direction of rotation) at interval.
Situation with the battery of Fig. 7 is that example describes.On section, in the straight line portion of electrode layer, the thickness of each battery lead plate and dividing plate is approximately 0.1mm, and length is about 100mm, and is very elongated.For this elongated battery lead plate, thereby if the anglec of rotation at interval the big vacation picture that then can produce linearity in the direction along battery lead plate diminish the resolution (with respect to the resolution of layer structure) of thickness direction, therefore, make the section picture in order to ensure resolution, in this case, the anglec of rotation of revolving detection transmission picture in the process that turns around is refined to about 0.06 ° at interval, and 360 ° number of views (the transmission picture photography number of rotation one whole circle) change is greatly to 6000.
Like this, in CT device in the past, the resolution in order to ensure subject and direction layer quadrature of bedded structure need increase number of views, has long problem of tomography time.
Summary of the invention
The present invention In view of the foregoing finishes, and its purpose is, the CT device of section picture that obtains to have the subject of bedded structure with the short tomography time is provided.
In order to reach above-mentioned purpose, the CT device of first aspect present invention looks like to photograph to the section of subject with bedded structure, its purport is, this CT device has: radiation source, towards subject centered by the lonizing radiation optical axis of tomography face, radiating lonizing radiation, described subject with the mode mounting of the aspect of the bedded structure that will photograph and above-mentioned tomography hand-deliver fork on object stage; Radiation detecting unit detects and exports as the transmission picture the lonizing radiation that see through above-mentioned subject; Rotary unit makes above-mentioned object stage and above-mentioned lonizing radiation relatively rotate with respect to the rotating shaft with above-mentioned tomography face quadrature; The scan control unit, it is controlled above-mentioned rotary unit and above-mentioned radiation detecting unit and implements such priority scan: Yi Bian carry out above-mentioned rotation, Yi Bian preferentially be taken into a plurality of transmission pictures as scan-data and storage in above-mentioned aspect and above-mentioned lonizing radiation optical axis close to the parallel anglec of rotation; And reconstruction unit, rebuild at least one the section picture parallel with above-mentioned tomography face of above-mentioned subject according to above-mentioned scan-data.
Utilize this structure, the aspect of the bedded structure that will photograph of subject and lonizing radiation optical axis close to the parallel anglec of rotation preferentially (high frequency or predetermined angle carry out the detection of transmission picture) implement scanning, and rebuild the section picture of subject according to this scan-data, therefore, with revolve the scanning of turning around and compare, the lonizing radiation optical axis that makes the resolution that is helpless to the layer structure on the section picture is not preferential with the transmission picture detection of the rotating range that wide-angle and aspect are intersected, thus, can under the state that guarantees with the resolution of the direction of aspect quadrature, shorten the required time of scanning.And, also can shorten the section picture and rebuild the required time.
In order to reach above-mentioned purpose, second aspect present invention is in the CT device of first aspect record, its purport is, as above-mentioned preferential scanning, the first such scanning is implemented in above-mentioned scan control unit: centered by above-mentioned aspect first position of rotation parallel with above-mentioned lonizing radiation optical axis ± 60 ° in, in comprising first rotation angle range of above-mentioned first position of rotation, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as first scan-data.
Utilize this structure, in confined first rotation angle range of the aspect of the bedded structure that will photograph that the comprises subject position of rotation parallel with the lonizing radiation optical axis, implement first scanning, rebuild the section picture of subject according to detected first scan-data in first rotation angle range, therefore, with revolve the scanning of turning around and compare, omission is helpless to the transmission picture detection of the rotating range that the lonizing radiation optical axis of the resolution of the layer structure on the section picture intersects with wide-angle and aspect, thus, can under the state that guarantees with the resolution of the direction of aspect quadrature, shorten the required time of scanning.And, also can shorten the section picture and rebuild the required time.
In order to reach above-mentioned purpose, third aspect present invention is in the CT device of second aspect present invention record, its purport is, as above-mentioned preferential scanning, such second scanning is also implemented in above-mentioned scan control unit: by differ centered by 180 ° second position of rotation with above-mentioned first position of rotation ± 60 ° in, in comprising second rotation angle range of above-mentioned second position of rotation, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as second scan-data.
Utilize this structure, same with second aspect present invention, with revolve the scanning of turning around and compare, omission is helpless to the transmission picture detection of the rotating range that the lonizing radiation optical axis of the resolution of the layer structure on the section picture intersects with wide-angle and aspect, thus, can under the state that guarantees with the resolution of the direction of aspect quadrature, shorten the required time of scanning.And, also can shorten the section picture and rebuild the required time.
In order to reach above-mentioned purpose, fourth aspect present invention is in the CT device of second aspect present invention record, its purport is, above-mentioned scan control unit detects a plurality of transmission pictures at interval according to each first anglec of rotation in above-mentioned first scanning, as above-mentioned preferential scanning, the 3rd such scanning is also implemented in above-mentioned scan control unit: carry out above-mentioned rotation in the 3rd rotation angle range of at least a portion outside comprising above-mentioned first rotation angle range on one side, will according to each than above-mentioned first anglec of rotation interval big three anglec of rotation interval detected a plurality of transmission pictures as three scan-data be taken into and store on one side.
In order to reach above-mentioned purpose, fifth aspect present invention is in the CT device of third aspect present invention record, its purport is, above-mentioned scan control unit detects a plurality of transmission pictures at interval according to each first anglec of rotation in above-mentioned first scanning, in above-mentioned second scanning, detect a plurality of transmission pictures at interval according to each second anglec of rotation, as above-mentioned priority scan, the 3rd such scanning is also implemented in above-mentioned scan control unit: in the 3rd rotation angle range that comprises at least a portion outside above-mentioned first rotation angle range and above-mentioned second rotation angle range, carry out above-mentioned rotation on one side, will according to each than any big three anglec of rotation interval detected a plurality of transmission pictures in above-mentioned first anglec of rotation interval and above-mentioned second anglec of rotation interval as three scan-data be taken into and store on one side.
Utilize the structure of fourth aspect present invention and the 5th aspect, revolve the scanning of turning around and compare with common, implement to be helpless to the transmission picture detection of the rotating range that the lonizing radiation optical axis of the resolution of the layer structure on the section picture intersects with wide-angle and aspect at interval with the rough anglec of rotation, thus, can under the state that guarantees with the resolution of the direction of aspect quadrature, shorten the required time of scanning and the section picture is rebuild the required time, and, can be to a certain extent on the section picture structure beyond the presentation layer columnar structure well.
In order to reach above-mentioned purpose, sixth aspect present invention provides a kind of method for imaging of CT device, this CT device looks like to photograph to the section of subject with bedded structure, its purport is, this CT device has: radiation source, towards subject centered by the lonizing radiation optical axis of tomography face, radiating lonizing radiation, described subject with the mode mounting of the aspect of the bedded structure that will photograph and above-mentioned tomography hand-deliver fork on object stage; Radiation detecting unit detects and exports as the transmission picture the lonizing radiation that see through above-mentioned subject; Rotary unit makes above-mentioned object stage and above-mentioned lonizing radiation relatively rotate with respect to the rotating shaft with above-mentioned tomography face quadrature; The scan control unit, control above-mentioned rotary unit and above-mentioned radiation detecting unit and implement such scanning: in predetermined rotation angle range, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as scan-data; And reconstruction unit, rebuild the section picture of above-mentioned subject according to the scan-data of above-mentioned storage, in above-mentioned CT device, have following process: the process of determining first position of rotation that above-mentioned aspect is parallel with above-mentioned lonizing radiation optical axis; Implement the process of priority scan, preferentially be taken into a plurality of transmission pictures as scan-data and storage while this priority scan carries out above-mentioned rotation in the anglec of rotation near above-mentioned first position of rotation; And the process of rebuilding at least one the section picture parallel with above-mentioned tomography face of above-mentioned subject according to above-mentioned scan-data.
In the method, can access the effect identical with the effect of first aspect present invention.
In order to reach above-mentioned purpose, seventh aspect present invention is in the method for imaging of the CT device of sixth aspect present invention record, its purport is, above-mentioned priority scan applied centered by above-mentioned first position of rotation ± comprise in 60 ° above-mentioned first position of rotation first rotation angle range scanning scanning or applied in the scanning by the scanning of second rotation angle range that differs centered by 180 ° second position of rotation ± comprise in 60 ° above-mentioned second position of rotation with above-mentioned first position of rotation.
In the method, can access the effect identical with the effect of second aspect present invention, the third aspect.
According to the present invention, can provide the CT device of section picture that obtains to have the subject of bedded structure with the short tomography time.
Description of drawings
Fig. 1 shows the sketch map ((a) for vertical view, (b) be front view) of structure of the CT device of first embodiment of the present invention.
Fig. 2 is the flow chart of the tomography of first embodiment of the present invention.
Fig. 3 is the figure (vertical view) of the carrying state of mounting on object stage that the battery of first embodiment of the present invention is shown.
Fig. 4 is the example of rotation angle range of the scanning of first embodiment of the present invention.
Fig. 5 is the example of rotation angle range of scanning of the variation 3 of first embodiment of the present invention.
Fig. 6 is the example of rotation angle range of scanning of the variation 5 of first embodiment of the present invention.
Fig. 7 is the sketch map (profile) as the battery 90 of subject.
Fig. 8 shows the sketch map ((a) is vertical view, (b) is front view) of the structure of CT device in the past.
Label declaration
The 1:X ray tube; The 2:X beam; The 3:X ray detector; 4: object stage; 5: subject; 6:XY mechanism; 7: rotating-/ lifting mechanism; 8: shift mechanism; 9: the control handling part; 9a: display part; 9b: input part; 9c: scan control section; 9d: reconstruction portion; 10: section is as the visual field; 11: the zone that photograph; 12: aspect; 90: battery; 91: housing; 92: positive plate; 93: negative plate; 94: electrolyte; The 101:X ray tube; The 102:X beam; The 103:X ray detector; 104: object stage; 105: subject; 105a: target portion; 106:XY mechanism; 107: rotating-/ lifting mechanism; 108: the control handling part; 109: shift mechanism; 110: section is as the visual field.
The specific embodiment
＜embodiment 〉
Below, as embodiments of the invention, with reference to Fig. 1～Fig. 6 embodiments of the present invention are described.
(structure of first embodiment of the present invention)
Below, the structure of embodiments of the present invention is described with reference to Fig. 1.Fig. 1 shows the sketch map ((a) for vertical view, (b) be front view) of structure of the CT device of first embodiment of the present invention.As shown in Figure 1, X-ray tube (radiation source) 1 and X-ray detector (radiation detecting unit) 3 arranged opposite, the part of the X ray that this X-ray detector 3 radiates the x-ray focus F from X-ray tube 1 by the resolution of two dimension i.e. pyramidal X-ray beam (lonizing radiation) 2 centered by optical axis (lonizing radiation optical axis) L detects, the X-ray beam 2 that sees through subject 5 is detected by X-ray detector 3 and as transmission picture (transmission data) output, described subject 5 with the mode mounting that enters this X-ray beam 2 on object stage 4.
Tomography face TP is defined as by x-ray focus F and the face vertical with rotating shaft RA, and optical axis L is positioned on the tomography face TP.In addition, can rotating shaft RA (with object stage 4) and X-ray detector 3 be approached or away from X-ray tube 1 by shift mechanism (photography multiplying power setup unit) 8, the detection that can change between the detection faces 3a of the x-ray focus F of X-ray tube 1 and the photo distance FCD between the rotating shaft RA (Focus to rotation Center Distance) and x-ray focus F and X-ray detector 3 be set apart from FDD (Focus to DeterctorDistance).
Here, XY mechanism 6 be used for carrying out the position adjustment so that the target site of subject 5 in rotating shaft RA, shift mechanism 8 be used for according to purpose change the photography multiplying power (=FDD/FCD), the z direction of rotating-/ lifting mechanism 7 moves be used to the target portion that makes subject 5 corresponding with the height of X-ray beam 2.And the rotation of rotating-/ lifting mechanism 7 is used under the situation that section is looked like to photograph, and makes subject 5 with respect to X-ray beam 2 rotations, thereby obtains the transmission picture in a plurality of directions.
Section shown in Figure 1 is defined as the visual field (or being called scanning area) 10, is revolving the zone that is contained in all the time during turning around in the determined X-ray beam 2.Section is to be the zone of the roughly tubular of axle with rotating shaft RA as the visual field 10, is the zone that can not rebuild the section picture limpingly.As its element, also has control each mechanism (XY mechanism 6, rotating-/ lifting mechanism 7, shift mechanism 8) and to the control handling part 9 handled from the transmission data of X-ray detector 3, display process result's etc. display part 9a, the X ray control part (not shown) of control X-ray tube 1 etc.
Control handling part 9 is common computers, by formations such as CPU, memorizer, disk (nonvolatile memory), display part 9a, input part (keyboard and mouse etc.) 9b, mechanism controls plate, interfaces.
Control handling part 9 is controlled each portion of mechanism 6,7,8 by the signal (encoder pulse etc.) that the mechanism controls plate receives each portion of mechanism 6,7,8 operating position, thereby carry out the para-position of subject and scanning (tomographic scan) etc., in addition, collection command pulse of transmission data etc. is sent to X-ray detector 3.In addition, in each portion of mechanism 6,7,8 not shown encoder is installed, read XY direction shift position X, the Y based on XY mechanism 6 of object stage 4, based on the z direction shift position z of rotating-/ lifting mechanism 7 and anglec of rotation φ and based on FCD, the FDD of shift mechanism 8, and they are sent to control handling part 9 respectively.
And the transmission data from X-ray detector 3 is collected and stored to control handling part 9 when tomography, thereby carry out the section picture that reconstruction process makes one or more subject parallel with the tomography face, and be shown in display part 9a.In addition, control handling part 9 sends instruction to X ray control part (not shown), specified tube voltage, tube current, and carry out the radiation of X ray, the indication that stops.Tube voltage, tube current can change accordingly with subject.
As shown in Figure 1, control handling part 9 makes CPU performance function as having read in software functional module, possess scan control section (scan control unit) 9c and use scan-data to make reconstruction portion (reconstruction unit) 9d etc. of section picture, described scan control section 9c is used for implementing such scanning: make object stage 4 rotations in preset range, simultaneously detected a plurality of transmission pictures are taken into and store as scan-data.
(effect of first embodiment)
To be example to the situation of photographing as the battery 90 of subject 5, the effect of first embodiment with aforesaid structure is described with reference to Fig. 7, Fig. 2 to Fig. 4.
Shown in Fig. 7 as the sketch map (profile) of the battery 90 of subject.This figure is the profile that lithium battery, Ni-MH battery, the isostructure summary of Ni-Cr battery are shown.Positive plate 92 and negative plate 93 are reeled multiple and are accommodated in the housing 91 across dividing plate (not shown), are full of electrolyte 94 in the space.For example Ceng spacing (positive plate-positive plate) is about 0.3mm, and the number of turns is tens circles, is of a size of about 30mm * 120mm as section integral body.
Fig. 2 is the flow chart of the tomography of first embodiment, and the operation as the tomography of present embodiment possesses following each operation:
(1) step of mounting battery
(2) step of setting photography conditions
(3) step that scans
The step of (4) rebuilding
Below, each operation is described.
(1) step of mounting battery
As shown in Figure 2, in step S1, the operator as follows with battery 90 mountings in object stage 4.Fig. 3 is the figure (vertical view) that illustrates the carrying state of battery mounting on object stage.At first, the anglec of rotation of object stage 4 is reset to 0 ° (first position of rotation), then, the mounting battery 90 as follows: make the zone (ROI that will photograph of battery 90; The target area) aspect 12 of the bedded structure in 11 intersect (quadrature in fact) with tomography face TP and aspect 12 parallel with optical axis L.
(2) step of setting photography conditions
Then, in step S2, set photography conditions.In this photography conditions, comprise geometrical condition, X ray condition, the condition of scanning, recondition etc.Setting as this geometrical condition, from input part 9b input instruction, control XY mechanism 6 in addition, sets the photography multiplying power so that the zone 11 that will photograph and section are controlled shift mechanism 8 as the visual field 10 consistent modes so that the zone 11 that will photograph probably is positioned on the axial rotary RA.And, thereby make the height in the zone 11 that will photograph corresponding with tomography face TP from input part 9b control rotation and lifting mechanism 7.
As the X ray condition enactment, set the tube voltage, the tube current that are suitable for subject.Set as the condition of scanning, with aspect 12 approach the anglecs of rotation parallel with optical axis L preferentially (high frequency or predetermined angle) carry out the detection of transmission picture.Particularly, set as the condition of scanning, centered by 0 ° (first position of rotation) ± 60 ° in, will comprise that the rotation angle range (first rotation angle range) of 0 ° successive range (below 120 °) is imported setting as sweep limits.For example Fig. 4 is the example of rotation angle range of scanning, 45 ° centered by 0 ° scope is set at rotation angle range here.
Impose a condition as scanning, the anglec of rotation that also set to detect the transmission picture is the integration frame number of (for example 0.075 °), 1 transmission picture (for example 5) etc. at interval.And, as recondition, set section and rotate axial interval (with respect to the profile position of tomography face TP) etc. as number and its.
(3) step that scans
After step S2, in step S3, scan.When operator's input scan begins, scan control section 9c control rotation and lifting mechanism 7 and X-ray detector 3, in the rotation angle range of setting, make object stage 4 (continuous or stage) rotation, will be taken into and store as (first) scan-datas according to the detected a plurality of transmission pictures in (first) anglec of rotation interval of each setting simultaneously.
The step of (4) rebuilding
After step S3, in step S4, reconstruction portion 9d rebuilds with section photographic plane TP parallel (profile position of setting) at least one section pictures to the section of battery 90 as the section pictures in 10 according to scan-data, and shows and store.Reconstruction utilizes common filtering to proofread and correct back projection's method to carry out, but different has only, proofread and correct back projection with respect to the filtering of carrying out 360 ° amount usually, only the data of the angular range of scanning are carried out filtering herein and proofread and correct back projection's (namely with the angular range of scanning is not carried out back projection be of equal value).
So far, the flow process of Fig. 2 finishes.
(effect of first embodiment)
According to first embodiment, in the rotation angle range of (the 45 °) scanning centered by the aspect 12 of the bedded structure in the zone that will photograph 11 of battery 90 position of rotation parallel with optical axis L, implement scanning, rebuild the section picture of battery 90 according to detected scan-data in this rotation angle range, therefore, with revolve the scanning of turning around and compare, omission is helpless to the transmission picture detection of the rotating range that the optical axis L of the resolution of the layer structure on the section picture intersects with wide-angle and aspect 12, thus, can under the state that guarantees with the resolution of the direction of aspect quadrature, shorten the required time of scanning.And, also can shorten the section picture and rebuild the required time.Particularly, utilize 45 ° scanning just can finish with 360 ° of scannings of carrying out usually, therefore, sweep time and reconstruction time become about 1/8.
In fact, relatively { image 1: under the condition (45 ° scannings) of first embodiment, carry out the section picture that tomography obtains } and { image 2: the section picture of photographing and obtaining with 360 ° scanning } under the same conditions, the picture size of image 1 is big slightly, but identical with the resolution of the direction of aspect 12 quadratures.The size of image 1 is greatly because optical axis L is half of image 2 along the data volume of the direction of aspect.Therefore, the integration frame number that makes the photography conditions of image 1 is twice and image 1 ' is photographed to come relatively, and image 1 ' and image 2 become the image of not seeing difference.
In addition, according to first embodiment, as less important effect, has the effect that is difficult to produce ringing artifact.In fact, more above-mentioned image 1 and image 2 in image 2, can be seen the fuzzy ringing artifact centered by rotating shaft RA, but can't see fully in image 1.
(distortion of first embodiment)
In addition, the invention is not restricted to above-mentioned embodiment, in the scope that does not break away from its purport, can carry out various distortion and implement.
(variation 1)
In the first embodiment, centered by the aspect 12 of the bedded structure position of rotation parallel with optical axis L, set the rotation angle range of 45 ° scanning, but rotation angle range may not be 45 °.The bedded structure of battery 90 tilts from aspect 12 partly because of cinch or fold.As long as can access the transmission picture from the direction in this slant range, therefore, set rotation angle range in the mode of the range of tilt angles α that comprises estimation and get final product.
Accurately, the layer of battery is configured in has thickness in the visual field, therefore, need make rotation angle range increase angle beta, this angle beta is to the angle of X ray with the parallel position of rotation that sees through of lower end layer of thickness from X ray and the parallel position of rotation that sees through of the upper end layer of thickness.Therefore, as rotation angle range, increase β and surpass alpha+beta and set and get final product.This angle beta is equivalent to probably the opening angle of this thickness of seeing from x-ray focus F, as the value of β, be maximum when maximum ga(u)ge (=section is as the diameter in the visual field 10), at this moment, and β and segment angle θ
0Consistent (with reference to Fig. 1).In common battery, this alpha+beta is no more than 120 °, and therefore, rotation angle range is set in ± 60 ° (overall with is below 120 °) and comprises that 0 ° gets final product, but corresponding with subject, sets narrowly as far as possible, thus, and can high speed.The width of rotation angle range for example is 20 ° or 10 ° of such getting final product among a small circle under the good situation of the flatness of subject sometimes.
(embodiment 2)
In the first embodiment, centered by the aspect 12 of the bedded structure position of rotation parallel with optical axis L, set the rotation angle range (usually preferred symmetry) of 45 ° scanning symmetrically, but inaccurately symmetry also can, as long as general symmetry.
(variation 3)
In the first embodiment, and then, centered by (first) position of rotation (0 °) with mounting battery 90 differs 180 ° second position of rotation (180 °) ± 60 ° in, the continuous scope that setting comprises second position of rotation is second rotation angle range (below 120 °), implement the second such scanning: in this second rotation angle range, make object stage 4 rotations, simultaneously, to be taken into and store as second scan-data according to each detected a plurality of transmission picture in second anglec of rotation interval, in addition also can be according at least one the section picture parallel with tomography face TP of (first) scan-data that carries out at first and second scan-data reconstruction battery 90.
Fig. 5 is the example of rotation angle range of the scanning of variation 3, is 45 ° scope centered by 180 ° as second rotation angle range.First scan-data is rebuild in reconstruction in this case as described in first embodiment, similarly rebuild second scan-data, and two sections are got final product as addition.And, also can then the first scan-data filtering be proofreaied and correct the section picture that obtains after the back projection second scan-data is carried out filtering correction back projection.
In addition, second rotation angle range also can with first rotation angle range be not equally centered by 180 ° 45 ° scope but centered by 180 ° ± 60 ° in, comprise the rotation angle range of second position of rotation (180 °).And second anglec of rotation is identical at interval with first anglec of rotation usually at interval, but also can be different.According to variation 3, can access the effect same with first embodiment.
Particularly, get final product with 45 ° of scannings with 45 ° with 360 ° of scannings of carrying out usually, therefore, sweep time and reconstruction time become about 1/4.In fact, relatively { image 3: carry out the section picture that tomography obtains under the condition of variation 3 (45 ° and 45 ° scanning) } and { image 2: the section picture of photographing and obtaining with 360 ° scanning } under the same conditions, image 3 and image 2 become the image of not seeing difference.And, in image 2, can see the fuzzy ringing artifact centered by rotating shaft RA, but in image 3, can't see fully.
(variation 4)
In the first embodiment, as the zone that will photograph 11 of battery 90, select the part of plane layer, but layer also can be curved surface.In this case, impose a condition as aspect 12 if consider the tangential direction of the layer segment that will observe, then this aspect 12 can obtain as good section picture with probably parallel layer segment.
(variation 5)
In the first embodiment, under the situation of the structure beyond battery 90 comprises bedded structure, also want sometimes to photograph in the mode that on the section picture that obtains that bedded structure is photographed, manifests other structures to a certain extent well.In this case, except first scanning (with second scanning of variation 3) of first embodiment, apply the 3rd rough scanning that increases anglec of rotation interval, and can rebuild the section picture of battery 90 according to the scan-data of first scanning (with second scanning) and the 3rd scanning.
The 3rd scans to comprise the 3rd rotation angle range of first rotation angle range (with second rotation angle range) at least a portion in addition and rotates, simultaneously will according to each than first anglec of rotation at interval (with above-mentioned second anglec of rotation any at interval) big the 3rd anglec of rotation at interval detected a plurality of transmission pictures be taken into and store as the 3rd scan-data.
Fig. 6 is the example of rotation angle range of the scanning of variation 5.
As the 3rd scanning, can be that rotation angle range is 360 ° full scan, or 180 °+fan angle θ
0More than, the scanning of half below 360 °, can also be the scanning that first rotation angle range (with second rotation angle range) part is in addition replenished.Rotation angle range as this scanning that replenishes can be all parts in addition, also can be the part of part in addition, and also can repeat with first rotation angle range (with second rotation angle range).
According to variation 5, revolve the scanning of turning around and compare with common, implement to be helpless to the transmission picture detection of the rotating range that the optical axis L of the resolution of the layer structure on the section picture intersects with wide-angle and aspect 12 at interval with the rough anglec of rotation, thus, can under the state that guarantees with the resolution of the direction of aspect 12 quadratures, shorten the required time of scanning and the section picture is rebuild the required time, and the structure on the section picture beyond the bedded structure also can manifest to a certain extent well.
(variation 6)
In the first embodiment, the anglec of rotation that detects the transmission picture is constant at interval, but also can be used as the function of the anglec of rotation and change.For example continuously or interim ground more more little near 0 ° (first position of rotation).
In addition, make under the situation of anglec of rotation interval as the function of the anglec of rotation, the rotation angle range of scanning need not to be limited in below 120 °.That is, as the anglec of rotation at interval, so that position of rotation is more near 0 ° and 180 ° more little, more change continuously or interimly near 90 ° and 270 ° of more big modes and get final product.
(variation 7)
In the first embodiment, make object stage 4 (battery 90) with respect to X-ray beam 2 rotations, but rotation can be relative.For example also can not make object stage 4 rotations, and X-ray tube 1 and X-ray detector 3 are rotated with respect to rotating shaft RA.
And, in the first embodiment, make object stage 4 carry out the XY direction with respect to rotating shaft RA and X-ray beam 2 and move, but the XY direction to move also can be relative.For example do not make object stage 4 carry out the XY direction and move, move and make rotating shaft RA and X-ray beam 2 (X-ray tube 1 and X-ray detector 3) carry out the XY direction.
And, in the first embodiment, make object stage 4 carry out the z direction with respect to X-ray beam 2 and move, but the z direction to move also can be relative.For example do not make object stage 4 carry out the z direction and move, move and make X-ray beam 2 (X-ray tube 1 and X-ray detector 3) carry out the z direction.
(variation 8)
In the first embodiment, be that example describes as subject with battery 90, but subject of the present invention is not limited to battery, also can effectively be applied to other the subject with bedded structure, for example capacitor, coil, multilager base plate etc.
(variation 9)
In the first embodiment, use X ray as lonizing radiation, but be not limited to X ray, so long as radioparent lonizing radiation get final product.As lonizing radiation, also can be γ line and microwave etc. for example.
Claims (7)
1. CT device that the section of subject with bedded structure is looked like to photograph is characterized in that having:
Radiation source, towards subject centered by the lonizing radiation optical axis of tomography face, radiating lonizing radiation, described subject with the mode mounting of the aspect of the bedded structure that will photograph and above-mentioned tomography hand-deliver fork on object stage;
Radiation detecting unit detects and exports as the transmission picture the lonizing radiation that see through above-mentioned subject;
Rotary unit makes above-mentioned object stage and above-mentioned lonizing radiation relatively rotate with respect to the rotating shaft with above-mentioned tomography face quadrature;
The scan control unit, control above-mentioned rotary unit and above-mentioned radiation detecting unit and implement such priority scan: Yi Bian carry out above-mentioned rotation, Yi Bian preferentially be taken into a plurality of transmission pictures as scan-data and storage with above-mentioned lonizing radiation optical axis close to the parallel anglec of rotation in above-mentioned aspect; And
Reconstruction unit is rebuild at least one the section picture parallel with above-mentioned tomography face of above-mentioned subject according to above-mentioned scan-data.
2. CT device according to claim 1 is characterized in that,
As above-mentioned preferential scanning, the first such scanning is implemented in above-mentioned scan control unit: centered by above-mentioned aspect first position of rotation parallel with above-mentioned lonizing radiation optical axis ± 60 ° in, in comprising first rotation angle range of above-mentioned first position of rotation, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as first scan-data.
3. CT device according to claim 2 is characterized in that,
As above-mentioned preferential scanning, such second scanning is also implemented in above-mentioned scan control unit: by differ centered by 180 ° second position of rotation with above-mentioned first position of rotation ± 60 ° in, in comprising second rotation angle range of above-mentioned second position of rotation, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as second scan-data.
4. CT device according to claim 2 is characterized in that,
Above-mentioned scan control unit detects a plurality of transmission pictures at interval according to each first anglec of rotation in above-mentioned first scanning,
As above-mentioned preferential scanning, the 3rd such scanning is also implemented in above-mentioned scan control unit: carry out above-mentioned rotation in the 3rd rotation angle range of at least a portion outside comprising above-mentioned first rotation angle range on one side, will according to each than above-mentioned first anglec of rotation interval big three anglec of rotation interval detected a plurality of transmission pictures as three scan-data be taken into and store on one side.
5. CT device according to claim 3 is characterized in that,
Above-mentioned scan control unit detects a plurality of transmission pictures at interval according to each first anglec of rotation in above-mentioned first scanning, detect a plurality of transmission pictures at interval according to each second anglec of rotation in above-mentioned second scanning,
As above-mentioned priority scan, the 3rd such scanning is also implemented in above-mentioned scan control unit: in the 3rd rotation angle range that comprises the part outside above-mentioned first rotation angle range and above-mentioned second rotation angle range at least, carry out above-mentioned rotation on one side, will according to each than any big three anglec of rotation interval detected a plurality of transmission pictures in above-mentioned first anglec of rotation interval and above-mentioned second anglec of rotation interval as three scan-data be taken into and store on one side.
6. the method for imaging of a CT device, this CT device looks like to photograph to the section of subject with bedded structure, it is characterized in that,
This CT device has: radiation source, towards subject centered by the lonizing radiation optical axis of tomography face, radiating lonizing radiation, described subject with the mode mounting of the aspect of the bedded structure that will photograph and above-mentioned tomography hand-deliver fork on object stage; Radiation detecting unit detects and exports as the transmission picture the lonizing radiation that see through above-mentioned subject; Rotary unit makes above-mentioned object stage and above-mentioned lonizing radiation relatively rotate with respect to the rotating shaft with above-mentioned tomography face quadrature; The scan control unit, control above-mentioned rotary unit and above-mentioned radiation detecting unit and implement such scanning: in predetermined rotation angle range, carry out above-mentioned rotation on one side, on one side detected a plurality of transmission pictures are taken into and store as scan-data; And reconstruction unit, rebuild the section picture of above-mentioned subject according to the scan-data of above-mentioned storage,
In above-mentioned CT device, have following process:
Determine the process of first position of rotation that above-mentioned aspect is parallel with above-mentioned lonizing radiation optical axis;
Implement the process of priority scan, preferentially be taken into a plurality of transmission pictures as scan-data and storage while this priority scan carries out above-mentioned rotation in the anglec of rotation near above-mentioned first position of rotation; And
Rebuild the process of at least one the section picture parallel with above-mentioned tomography face of above-mentioned subject according to above-mentioned scan-data.
7. the method for imaging of CT device according to claim 6 is characterized in that,
Above-mentioned priority scan applied centered by above-mentioned first position of rotation ± comprise in 60 ° above-mentioned first position of rotation first rotation angle range scanning scanning or also applied in the scanning by the scanning of second rotation angle range that differs centered by 180 ° second position of rotation ± comprise in 60 ° above-mentioned second position of rotation with above-mentioned first position of rotation.
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| CN113188487A (en) * | 2021-04-27 | 2021-07-30 | 山东非金属材料研究所 | Method for detecting gap width of plate-shaped composite material containing ceramic block splicing layer |
| CN116086367B (en) * | 2023-04-10 | 2023-08-15 | 宁德时代新能源科技股份有限公司 | Battery detection method, device, storage medium and battery detection equipment |
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