CN103196929A - Scanning device and detection method based on computer layering scanning imaging CL (computed laminography) system - Google Patents

Abstract

The invention discloses a scanning device and a detection method based on a computer layering scanning imaging CL (computed laminography) system. An X-ray source is positioned at the bottom end of the device and is used for emitting cone-beam X-rays upwards; an objective table is arranged above the X-ray source and performs translation movement in spatial three-dimensional direction; a fixing frame is arranged right above the objective table and is connected with a rotary arm, so that the rotary arm performs circumference rotation movement; the rotary arm is provided with a guide rail, and a flat panel detector is positioned on the guide rail and slides on the rotary arm by utilizing the guide rail; the flat panel detector is positioned on any part of the semi-spherical surface by combining with the sliding on the rotary arm as well as the circumference rotation movement of the rotary arm. The scanning device is flexible, can perform tomography on plat-shaped construction element samples under the conditions of multiple scanning dip angles, 360-degree rotation angles as well as multiple magnification ratios, can simplify the mechanical motion complexity maximally, and can improve the system performances.

Description

A kind of scanister and detection method based on computing machine demixing scan imaging CL system

Technical field

The present invention relates to x radial imaging detection technique field, relate in particular to a kind of scanister and detection method based on computing machine demixing scan imaging CL system.

Background technology

At present, X ray computer tomoscan imaging (CT-Computed Tomography) technology is a kind of lossless detection method of effective inspected object inner structure three-dimensional information, all be widely used in fields such as industry, medical diagnosiss, its sweep object yardstick on three-dimensional is close.But the CT technology is for tabular components such as multilayer board, sheet fossil, aircraft wing, solar panels, and imaging effect is also unsatisfactory.In recent years, X ray computer demixing scan imaging (CL-Computed Laminography) Study on Technology and development attract people's attention, this technology to analyze to as if flat object, the x ray only penetrates object at thickness direction, and typical CL system mainly comprises three parts: x radiographic source, detector and objective table.

It is a kind of limited angle shadow casting technique of non-coaxial scanning on the CL technological essence.Because the long axis direction penetration thickness is big, the contrast sensitivity of fluoroscopy images reduces, making tabular component carry out conventional CT scan becomes very difficult even can't realize because penetrating, and the CL technology that adopts non-coaxial manner is when scanning, X ray is along passing with the angled direction of tabular sample plane normal, normal direction with the tabular component plane is a rotary sample, when from a plurality of angles sample being scanned, X ray passes sample thickness and is more or less the same, by regulating ray energy, can obtain contrast sensitivity preferably, simultaneously this scan mode allows sample to be placed on the place nearer apart from light source and obtains bigger amplification ratio, thereby obtains higher spatial discrimination.

Along with digital detector and development of computer, the CL system is based on traditional batch imaging technique and CT technology etc., develop rapidly and replaced traditional layering imaging system, but in the existing C Lindenmayer system Scan Architecture, test sample is inconvenient to place, the pitch angle of sample is inconvenient to adjust, and scan mode is single, and system performance has to be strengthened.

Summary of the invention

The purpose of this invention is to provide a kind of scanister and detection method based on computing machine demixing scan imaging CL system, this scanister is flexible and changeable, can under multiple scanning inclination angle, 360 degree rotation angle and multiple amplification ratio condition, carry out fault imaging to the tabular component sample, and simplify the mechanical motion complexity of system to greatest extent, improve system performance.

The objective of the invention is to be achieved through the following technical solutions, a kind of scanister based on computing machine demixing scan imaging CL system, described scanister comprises x-ray source, objective table, flat panel detector, pivoted arm, fixed mount, wherein:

Described x-ray source is positioned at the lowermost end of described device, is used for upwards launching cone-beam X-ray;

Described objective table is arranged on the top of described x-ray source, does translation motion in the space three-dimensional direction;

Be provided with described fixed mount directly over the described objective table, described fixed mount links to each other with described pivoted arm, is used for fixing described pivoted arm, and makes described pivoted arm do circumference to rotatablely move, form the hemisphere face around described objective table;

Described pivoted arm is provided with guide rail, and described flat panel detector is positioned on this guide rail, utilizes this guide rail to slide at described pivoted arm; And described flat panel detector rotatablely moves in conjunction with its slip on described pivoted arm and the circumference of described pivoted arm, is positioned the hemispherical optional position that forms.

Describedly do translation motion in the space three-dimensional direction, specifically comprise:

Described objective table utilizes the axial motion of z to adjust the amplification ratio of object under test, and utilizes that x, y are axial to be moved through interpolation and realize that circuit orbit motion or other mode of motion are to realize the scanning projection to described object under test.

Described pivoted arm is C type arm or half C type arm configuration.

The plane of described flat panel detector is perpendicular in the central beam of described flat panel detector with described x-ray source all the time, and the motion of described flat panel detector and described objective table keeps synchronously.

A kind of detection method based on the described scanister of claim 1, described detection method comprises:

Setting up three dimensional space coordinate based on the described scanister of claim 1 is xyz, and initial point is x-ray source, i.e. the o point; And set up rotating coordinate system x1y1z1, and initial point is x-ray source, i.e. o point, wherein:

The plane at flat panel detector place is vertical with the oy1 straight line all the time, and the angle of x1 axle and x axle is θ, 0 °≤θ＜360 °; The angle of y1 axle and y axle is φ, 0 °＜φ＜90 °; Rotating coordinate system x1y1z1 and three dimensional space coordinate are that the transformational relation between the xyz is:

Utilize the described scanister of claim 1 that object under test is scanned, adjust objective table in the axial motion of x, y, making described object under test is that turning axle moves in a circle with the z axle, and flat panel detector is done with pivoted arm and described object under test and is synchronized with the movement;

According to θ angle and the φ angle situation set, at 0 degree to the 360 degree scope inward turnings arm of walking around, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test.

Described according to the θ angle of setting and

The angle situation specifically comprises:

Fixing θ angle, move in 0 ° to 90 ° scope in the φ angle;

Or under different φ corner conditions, move in 0 ° to 360 ° scope in the θ angle;

Or under different θ corner conditions, move in 0 ° to 90 ° scope in the φ angle.

Described detection method also comprises: adjust the φ angle according to demand, to adjust the position of described flat panel detector on described pivoted arm;

Or the z axle of adjustment objective table is with the amplification ratio of Adjustment System;

Or x, the y axle of adjustment objective table are so that the appointed area of described object under test is projected in the useful area of described flat panel detector.

As seen from the above technical solution provided by the invention, this scanister comprises x-ray source, objective table, and flat panel detector, pivoted arm, fixed mount, wherein said x-ray source is positioned at the lowermost end of described device, is used for upwards launching cone-beam X-ray; Described objective table is arranged on the top of described x-ray source, does translation motion in the space three-dimensional direction; Be provided with described fixed mount directly over the described objective table, described fixed mount links to each other with described pivoted arm, is used for fixing described pivoted arm, and makes described pivoted arm do circumference to rotatablely move, form the hemisphere face around described objective table; Described pivoted arm is provided with guide rail, and described flat panel detector is positioned on this guide rail, utilizes this guide rail to slide at described pivoted arm; And described flat panel detector rotatablely moves in conjunction with its slip on described pivoted arm and the circumference of described pivoted arm, is positioned the hemispherical optional position that forms.This scanister is flexible and changeable, can carry out fault imaging to the tabular component sample under multiple scanning inclination angle, 360 degree rotation angle and multiple amplification ratio condition, and simplify the mechanical motion complexity of system to greatest extent, improves system performance.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.

The structural representation based on the scanister of computing machine demixing scan imaging CL system that Fig. 1 provides for the embodiment of the invention;

Fig. 2 is the one-piece construction synoptic diagram of scanister that the embodiment of the invention gives an actual example;

Fig. 3 is the partial structurtes synoptic diagram of scanister that the embodiment of the invention gives an actual example;

Fig. 4 is the schematic flow sheet of the described detection method of the embodiment of the invention;

The coordinate system synoptic diagram that Fig. 5 sets up for the described detection method of the embodiment of the invention;

Fig. 6 is the scanning process synoptic diagram of the described detection method of the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that obtains under the creative work prerequisite.

Below in conjunction with accompanying drawing the embodiment of the invention is described in further detail, the structural representation based on the scanister of computing machine demixing scan imaging CL system that is illustrated in figure 1 as that the embodiment of the invention provides, scanister comprises x-ray source 1 among Fig. 1, objective table 2, flat panel detector 3, pivoted arm 4, fixed mount 5, wherein:

Described x-ray source 1 is positioned at the lowermost end of described device, is used for upwards launching cone-beam X-ray, and the visual angle of X ray that this x-ray source 1 is launched is bigger, has guaranteed that object under test is in motion process in the angular field of view of X ray.

Described objective table 2 is arranged on the top of described x-ray source 1, does translation motion in the space three-dimensional direction.In the specific implementation: objective table 2 utilizes the amplification ratio of adjusting object under test in the axial motion of z; Utilization moves through interpolation and realizes that circuit orbit motion or other mode of motion realize the scanning projection to object under test in that x, y are axial.

Be provided with described fixed mount 5 directly over the described objective table 2, described fixed mount 5 links to each other with described pivoted arm 4, is used for fixing described pivoted arm 4, and makes described pivoted arm 4 do circumference to rotatablely move, form the hemisphere face around described objective table 2.

Described pivoted arm 4 is provided with guide rail, and described flat panel detector 3 is positioned on this guide rail, utilizes this guide rail to slide at described pivoted arm 4; And described flat panel detector 3 rotatablely moves in conjunction with its slip on described pivoted arm 4 and the circumference of described pivoted arm 4, can be positioned at form on the hemispherical optional position.

In specific implementation, this pivoted arm 4 can be C type arm or half C type arm, also can by make described flat panel detector 3 move to other structures of the arbitrary position of formation hemisphere face.

Said apparatus is in scanning process, and the plane of flat panel detector 3 is perpendicular in the central beam of described flat panel detector 3 with described x-ray source 1 all the time, and described flat panel detector 3 is synchronous with the motion maintenance of described objective table 2.

Be described with the structure of concrete example to above-mentioned scanister more below, as the one-piece construction synoptic diagram of Fig. 2 for scanister that the embodiment of the invention gives an actual example, be illustrated in figure 3 as the partial structurtes synoptic diagram of scanister that the embodiment of the invention gives an actual example, in conjunction with Fig. 2 and 3, the scanister of this example comprises: the 02-objective table, 04-circular arc slide rail (being pivoted arm), 05-rotates fixed head, 06-equipment base plate, 07-master's support frame, 08-hollow speed reduction unit, the 09-servomotor, 10-slide rail fixed arch plate, 11-circular motion system, the 12-stage frame, the 13-Y shaft platform, 14-X axle servo-drive system, the 15-X shaft platform, the 16-Y axis motion system, 17-adjusting mechanism base, 18-adjusting mechanism support, 19-counterweight spring, 20-ray machine X-axis kinematic system, 21-ray machine Y-axis kinematic system, 22-ray machine Z axis motion system, 23-ray machine Z shaft locking device, 24-ray machine stationary installation.

In this embodiment scheme, whole scanister is fixed by main support frame 07, has constituted by x radiographic source (label 1 among Fig. 1), objective table 02 and flat panel detector (label 3 among Fig. 1) structure that three parts are formed, and the relation of various piece is as described below:

At the device bottommost equipment base plate 06 is arranged, connect adjusting mechanism base 17 and adjusting mechanism support 18, be used for placing the x radiographic source; The x radiographic source is fixing by ray machine stationary installation 24, and by ray machine X-axis kinematic system 20, ray machine Y-axis kinematic system 21,23 its motions in x, y, three directions of z of control of ray machine Z shaft locking device.

Equipment base plate 06 connects upright supports objective table part.Objective table 02 is by its motions at x, y both direction of control such as Y-axis platform 13, X-axis servo-drive system 14, X-axis platform 15, Y-axis kinematic systems 16; Stage frame 12 connects low-density objective table 02, is used for placing object to be scanned.

Servomotor 09 control rotation fixed head 05 is by rotation fixed head 05 fixing and rotation slide rail fixed arch plate 10, by the motion of gated sweep process middle plateform detectors such as circular arc slide rail 04, circular motion system 11.

Based on the described scanister of above-described embodiment, the embodiment of the invention also provides a kind of detection method, is illustrated in figure 4 as the schematic flow sheet of the described detection method of present embodiment, and described detection method comprises:

Step 41: setting up three dimensional space coordinate based on the described scanister of claim 1 is xyz, and initial point is x-ray source, i.e. the o point; And set up rotating coordinate system x1y1z1, initial point is x-ray source, i.e. the o point.

In this step, setting up three dimensional space coordinate based on the described scanister of claim 1 is xyz, and initial point is x-ray source, i.e. the o point; And set up rotating coordinate system x1y1z1, initial point is x-ray source, i.e. the o point; Wherein the plane at flat panel detector place is vertical with the oy1 straight line all the time, is illustrated in figure 5 as the coordinate system synoptic diagram that the described detection method of the embodiment of the invention is set up, among Fig. 5:

The angle of x1 axle and x axle is θ, i.e. rotation angle, 0 °≤θ＜360 °; The angle of y1 axle and y axle is φ, and then the angle of pitch is 90 °-φ, 0 °＜φ＜90 °; Wherein, rotating coordinate system x1y1z1 and three dimensional space coordinate are that the transformational relation between the xyz is:

Detailed process is that at first the transformational relation between coordinate system x1y1z1 and the coordinate system xyz is:

$\left[\begin{array}{c}x1\\ y1\\ \mathrm{<figure-callout\; id="1"\; label="z"\; filenames="HDA00003070049900011.png"\; state="\{\{state\}\}">z</figure-callout>}1\end{array}\right]=\mathrm{Rx}(\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})*\mathrm{Rz}\left(\mathrm{\&theta;}\right)*\left[\begin{array}{c}x\\ y\\ z\end{array}\right]=R*\left[\begin{array}{c}x\\ y\\ z\end{array}\right]$

Wherein, Rz (θ) represents to change counterclockwise around the z axle conversion of θ,

Expression is changeed counterclockwise around the x axle

Conversion, further:

$\mathrm{Rz}\left(\mathrm{\&theta;}\right)=\left[\begin{array}{ccc}\cos \left(\mathrm{\&theta;}\right)& \sin \left(\mathrm{\&theta;}\right)& 0\\ -\sin \left(\mathrm{\&theta;}\right)& \cos \left(\mathrm{\&theta;}\right)& 0\\ 0& 0& 1\end{array}\right]$

$\mathrm{Rx}(\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})=\left[\begin{array}{ccc}1& 0& 0\\ 0& \cos (\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})& \sin (\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})\\ 0& -\sin (\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})& \cos (\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})\end{array}\right]=\left[\begin{array}{ccc}1& 0& 0\\ 0& \sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&phi;}\right)\\ 0& -\cos \left(\mathrm{\&phi;}\right)& \sin \left(\mathrm{\&phi;}\right)\end{array}\right]$

$R=\mathrm{Rx}(\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})*\mathrm{Rz}\left(\mathrm{\&theta;}\right)=\left[\begin{array}{ccc}\cos \left(\mathrm{\&theta;}\right)& \sin \left(\mathrm{\&theta;}\right)& 0\\ -\sin \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&theta;}\right)\\ \sin \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& -\cos \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& \sin \left(\mathrm{\&phi;}\right)\end{array}\right]$

Thereby obtain $\left[\begin{array}{c}x1\\ y1\\ \mathrm{<figure-callout\; id="1"\; label="z"\; filenames="HDA00003070049900011.png"\; state="\{\{state\}\}">z</figure-callout>}1\end{array}\right]=\left[\begin{array}{ccc}\cos \left(\mathrm{\&theta;}\right)& \sin \left(\mathrm{\&theta;}\right)& 0\\ -\sin \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&phi;}\right)\\ \sin \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& -\cos \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& \sin \left(\mathrm{\&phi;}\right)\end{array}\right]\left[\begin{array}{c}x\\ y\\ z\end{array}\right]$

Step 42: utilize the described scanister of claim 1 that object under test is scanned, adjust objective table in the axial motion of x, y, making described object under test is that turning axle moves in a circle with the z axle, and flat panel detector is done with pivoted arm and described object under test and is synchronized with the movement.

In this step, further utilize the described scanister of claim 1 that object under test is scanned, adjust objective table in the axial motion of x, y, making object under test is that turning axle moves in a circle with the z axle, be illustrated in figure 6 as the scanning process synoptic diagram of the described detection method of the embodiment of the invention, according to Fig. 6: the no spinning motion of object under test itself, have only around the revolution motion of z axle; Flat panel detector is done with pivoted arm and described object under test and is synchronized with the movement, and described flat panel detector becomes plumbness with the beam centre ray all the time.

Step 43: according to θ angle and the φ angle situation set, at 0 degree to the 360 degree scope inward turnings arm of walking around, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test.

In this step, concrete scanning process can be set in conjunction with different conditions, and θ angle and φ angle situation according to setting specifically comprise:

Fixing θ angle, moving in 0 ° to 90 ° scope in the φ angle, utilizes described flat panel detector to gather the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test;

Or, under different φ corner conditions, move in 0 ° to 360 ° scope in the θ angle, the described flat panel detector of recycling is gathered the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test;

Or under different θ corner conditions, move in 0 ° to 90 ° scope in the φ angle, and the described flat panel detector of recycling is gathered the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test.

In specific implementation, can also adjust the φ angle according to demand, to adjust the position of described flat panel detector on described pivoted arm; Or the z axle of adjustment objective table, with the amplification ratio of Adjustment System; Or x, the y axle of adjustment objective table, so that the appointed area of described object under test is projected in the useful area of described flat panel detector.

In sum, scanister and detection method that the embodiment of the invention provides are flexible and changeable, can under multiple scanning inclination angle, 360 degree rotation angle and multiple amplification ratio condition, carry out fault imaging to the tabular component sample, and simplify the mechanical motion complexity of system to greatest extent, thereby improve system performance.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (7)

1. the scanister based on computing machine demixing scan imaging CL system is characterized in that described scanister comprises x-ray source, objective table, and flat panel detector, pivoted arm, fixed mount, wherein:

Described x-ray source is positioned at the lowermost end of described device, is used for upwards launching cone-beam X-ray;

Described objective table is arranged on the top of described x-ray source, does translation motion in the space three-dimensional direction;

Be provided with described fixed mount directly over the described objective table, described fixed mount links to each other with described pivoted arm, is used for fixing described pivoted arm, and makes described pivoted arm do circumference to rotatablely move, form the hemisphere face around described objective table;

Described pivoted arm is provided with guide rail, and described flat panel detector is positioned on this guide rail, utilizes this guide rail to slide at described pivoted arm; And described flat panel detector rotatablely moves in conjunction with its slip on described pivoted arm and the circumference of described pivoted arm, is positioned the hemispherical optional position that forms.

2. according to the described scanister based on computing machine demixing scan imaging CL system of claim 1, it is characterized in that, describedly do translation motion in the space three-dimensional direction, specifically comprise:

Described objective table utilizes the axial motion of z to adjust the amplification ratio of object under test, and utilizes that x, y are axial to be moved through interpolation and realize that circuit orbit motion or other mode of motion are to realize the scanning projection to described object under test.

3. according to the described scanister based on computing machine demixing scan imaging CL system of claim 1, it is characterized in that described pivoted arm is C type arm or half C type arm configuration.

4. according to the described scanister based on computing machine demixing scan imaging CL system of claim 1, it is characterized in that,

The plane of described flat panel detector is perpendicular in the central beam of described flat panel detector with described x-ray source all the time, and the motion of described flat panel detector and described objective table keeps synchronously.

5. the detection method based on the described scanister of claim 1 is characterized in that, described detection method comprises:

Setting up three dimensional space coordinate based on the described scanister of claim 1 is xyz, and initial point is x-ray source, i.e. the o point; And set up rotating coordinate system x1y1z1, and initial point is x-ray source, i.e. o point, wherein:

The plane at flat panel detector place is vertical with the oy1 straight line all the time, and the angle of x1 axle and x axle is θ, 0 °≤θ＜360 °; The angle of y1 axle and y axle is φ, 0 °＜φ＜90 °; Rotating coordinate system x1y1z1 and three dimensional space coordinate are that the transformational relation between the xyz is:

Utilize the described scanister of claim 1 that object under test is scanned, adjust objective table in the axial motion of x, y, making described object under test is that turning axle moves in a circle with the z axle, and flat panel detector is done with pivoted arm and described object under test and is synchronized with the movement;

According to θ angle and the φ angle situation set, at 0 degree to the 360 degree scope inward turnings arm of walking around, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine the data for projection of gathering is rebuild to obtain the faultage image of described object under test.

6. detection method as claimed in claim 5 is characterized in that, described according to the θ angle of setting and

The angle situation specifically comprises:

Fixing θ angle, move in 0 ° to 90 ° scope in the φ angle;

Or under different φ corner conditions, move in 0 ° to 360 ° scope in the θ angle;

Or under different θ corner conditions, move in 0 ° to 90 ° scope in the φ angle.

7. detection method as claimed in claim 5 is characterized in that, described detection method also comprises:

Adjust the φ angle according to demand, to adjust the position of described flat panel detector on described pivoted arm;

Or the z axle of adjustment objective table is with the amplification ratio of Adjustment System;

Or x, the y axle of adjustment objective table are so that the appointed area of described object under test is projected in the useful area of described flat panel detector.

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