CN103196929B - A kind of scanister based on computing machine demixing scan imaging CL system and detection method - Google Patents

Abstract

The invention discloses a kind of scanister based on computing machine demixing scan imaging CL system and detection method.X-ray source is positioned at the lowermost end of described device, for upwards launching cone-beam X-ray; Objective table is arranged on the top of described x-ray source, and translation motion is done in space three-dimensional direction; Be provided with described fixed mount directly over objective table, fixed mount is connected with described pivoted arm, makes described pivoted arm do circumference rotary motion; Described pivoted arm is provided with guide rail, and flat panel detector is positioned on this guide rail, utilizes this guide rail to slide on described pivoted arm; And flat panel detector is in conjunction with its slip on pivoted arm and the circumference rotary motion of pivoted arm, is positioned formed hemispherical optional position.This scanister is flexible and changeable, can carry out fault imaging, and simplify the mechanical motion complexity of system to greatest extent under multiple scanning inclination angle, 360 degree of rotation angle and multiple amplification ratio condition to tabular component sample, improves system performance.

Description

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

Technical field

The present invention relates to x-ray imaging detection technology field, particularly relate to a kind of scanister based on computing machine demixing scan imaging CL system and detection method.

Background technology

At present, X ray computer Tomography (CT-ComputedTomography) 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 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, the research and development of X ray computer demixing scan imaging (CL-ComputedLaminography) technology attracts people's attention, this technology to analyze to as if flat object, x-ray only penetrates object at thickness direction, and typical CL system mainly comprises three parts: x-ray source, detector and objective table.

It CL technological essence is the limited angle shadow casting technique of a kind of non-coaxial scanning.Because long axis direction penetration thickness is large, the contrast sensitivity of fluoroscopy images reduces, make tabular component carry out conventional CT scan to become very difficult and even cannot realize because penetrating, and when adopting the CL technology of non-coaxial mode to scan, X ray passes along the direction angled with plaques plane normal, with the normal direction of tabular component plane for axle rotary sample, when sample being scanned from multiple angle, X ray is more or less the same through the thickness of sample, by regulating ray energy, good contrast sensitivity can be obtained, the place that this scan mode allows sample to be placed on distance light source nearer simultaneously obtains larger amplification ratio, thus obtain higher spatial discrimination.

Along with the development of digital detector and computer technology, CL system is based on traditional batch imaging technique and CT technology etc., develop rapidly and instead of traditional Stratified Imaging system, but in existing CL system scan structure, detect sample to be 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 object of this invention is to provide a kind of scanister based on computing machine demixing scan imaging CL system and detection method, this scanister is flexible and changeable, fault imaging can be carried out to tabular component sample under multiple scanning inclination angle, 360 degree of rotation angle and multiple amplification ratio condition, and simplify the mechanical motion complexity of system to greatest extent, improve system performance.

The object 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, for upwards launching cone-beam X-ray;

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

Be provided with described fixed mount directly over described objective table, described fixed mount is connected with described pivoted arm, for fixing described pivoted arm, and makes described pivoted arm do circumference rotary motion, forms 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 on described pivoted arm; And described flat panel detector is in conjunction with its slip on described pivoted arm and the circumference rotary motion of described pivoted arm, is positioned formed hemispherical optional position.

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

Described objective table utilizes the amplification ratio of the motion adjustment object under test in z-axis direction, and utilize x, the interpolation that moves through in y-axis direction realizes circuit orbit motion or other mode of motion to realize scanning projection to described object under test.

Described pivoted arm is C-arm or half C-arm structure.

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 described flat panel detector keeps synchronous with the motion of described objective table.

Based on a detection method for scanister described in claim 1, described detection method comprises:

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

The plane at flat panel detector place all the time with oy1 linear vertical, and the angle of x1 axle and x-axis is θ, 0 °≤θ < 360 °; The angle of y1 axle and y-axis is φ, 0 ° of < φ < 90 °; Transformational relation between rotating coordinate system x1y1z1 and three-dimensional coordinate system xyz is:

Utilize scanister measuring targets described in claim 1 to scan, the motion of adjustment objective table in x, y-axis direction, make described object under test be that turning axle moves in a circle with z-axis, and flat panel detector is synchronized with the movement with pivoted arm and described object under test;

According to θ angle and the φ angle situation of setting, to walk around arm 0 degree to 360 degree scope inward turning, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine, the faultage image obtaining described object under test is rebuild to gathered data for projection.

Described according to setting θ angle and angle situation, specifically comprises:

Fixing θ angle, φ angle is at 0 ° to 90 ° range of motion;

Or in conjunction with under different φ corner condition, θ angle is at 0 ° to 360 ° range of motion;

Or in conjunction with under different θ corner condition, φ angle is at 0 ° to 90 ° range of motion.

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

Or the z-axis of adjustment objective table, with the amplification ratio of adjustment System;

Or x, the y-axis of adjustment objective table, be projected in the useful area of described flat panel detector to make the appointed area of described object under test.

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

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

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

Fig. 2 is the one-piece construction schematic diagram of embodiment of the present invention example scanister;

Fig. 3 is the partial structurtes schematic diagram of embodiment of the present invention example scanister;

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

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

The scanning process schematic diagram that Fig. 6 is detection method described in the embodiment of the present invention.

Embodiment

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

Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail, be illustrated in figure 1 the structural representation of the scanister based on computing machine demixing scan imaging CL system that the embodiment of the present invention provides, in Fig. 1, scanister comprises x-ray source 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, for upwards launching cone-beam X-ray, this x-ray source 1 launch X ray visual angle comparatively large, ensure that object under test is in the angular field of view of X ray in motion process.

Described objective table 2 is arranged on the top of described x-ray source 1, and translation motion is done in space three-dimensional direction.In specific implementation: objective table 2 utilizes the amplification ratio of the motion adjustment object under test in z-axis direction; Utilize and realize circuit orbit motion or other mode of motion realize the scanning projection of measuring targets in the interpolation that moves through in x, y-axis direction.

Be provided with described fixed mount 5 directly over described objective table 2, described fixed mount 5 is connected with described pivoted arm 4, for fixing described pivoted arm 4, and makes described pivoted arm 4 do circumference rotary motion, forms 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 on described pivoted arm 4; And described flat panel detector 3 is in conjunction with its slip on described pivoted arm 4 and the circumference rotary motion of described pivoted arm 4, can be positioned on formed hemispherical optional position.

In specific implementation, this pivoted arm 4 can be C-arm or half C-arm, also can by described flat panel detector 3 is moved to other structures of formation hemisphere face any position.

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 keeps synchronous with the motion of described objective table 2.

Be described with the structure of concrete example to above-mentioned scanister more below, as the one-piece construction schematic diagram that Fig. 2 is embodiment of the present invention example scanister, be illustrated in figure 3 the partial structurtes schematic diagram of embodiment of the present invention example scanister, composition graphs 2 and 3, the scanister of this example comprises: 02-objective table, 04-circular arc (i.e. pivoted arm), 05-rotates fixed head, 06-equipment base plate, the main support frame of 07-, 08-hollow decelerator, 09-servomotor, 10-slide rail fixed arch plate, 11-circular motion system, 12-stage frame, 13-Y shaft platform, 14-X axle servo-drive system, 15-X shaft platform, 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 kinematic system, 23-ray machine Z axis locking device, 24-ray machine stationary installation.

In this embodiment scheme, whole scanister is fixed by main support frame 07, and constitute by x-ray source (label 1 in Fig. 1), objective table 02 and flat panel detector (label 3 in Fig. 1) structure that three parts form, the relation of various piece is as described below:

There is equipment base plate 06 at device bottommost, connect adjusting mechanism base 17 and adjusting mechanism support 18, be used for placing x-ray source; X-ray source is fixed by ray machine stationary installation 24, and controls its motion in x, y, z three directions by ray machine X-axis kinematic system 20, ray machine Y-axis kinematic system 21, ray machine Z axis locking device 23.

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

Servomotor 09 controls to rotate fixed head 05, by rotating the fixing also rotation slide rail fixed arch plate 10 of fixed head 05, by the motion of the gated sweep process middle plateform detectors such as circular arc 04, circular motion system 11.

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

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

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

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

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

$\left[\begin{array}{c}x1\\ y1\\ z1\end{array}\right]=\mathrm{Rx}(\frac{\mathrm{\&pi;}}{2}-\mathrm{\&phi;})*\mathrm{Rz}\left(\mathrm{\&theta;}\right)*\left[\begin{array}{c}x\\ y\\ z\end{array}\right]=R*\left[\begin{array}{c}x\\ y\\ z\end{array}\right]$

Wherein, Rz (θ) represents the conversion turning θ around z-axis counterclockwise, represent and turn counterclockwise around x-axis conversion, further:

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

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

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

Thus obtain $\left[\begin{array}{c}x1\\ y1\\ z1\end{array}\right]=\left[\begin{array}{ccc}\cos \left(\mathrm{\&theta;}\right)& \sin \left(\mathrm{\&theta;}\right)& 0\\ -\sin \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&phi;}\right)\\ \sin \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& -\cos \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& \sin \left(\mathrm{\&phi;}\right)\end{array}\right]\left[\begin{array}{c}x\\ y\\ z\end{array}\right]$

Step 42: utilize scanister measuring targets described in claim 1 to scan, the motion of adjustment objective table in x, y-axis direction, make described object under test be that turning axle moves in a circle with z-axis, and flat panel detector is synchronized with the movement with pivoted arm and described object under test.

In this step, scanister measuring targets described in claim 1 is utilized to scan further, the motion of adjustment objective table in x, y-axis direction, object under test is made to be that turning axle moves in a circle with z-axis, be illustrated in figure 6 the scanning process schematic diagram of detection method described in the embodiment of the present invention, according to Fig. 6: object under test itself without spinning motion, only around the revolution motion of z-axis; Flat panel detector is synchronized with the movement with pivoted arm and described object under test, and described flat panel detector becomes plumbness with beam centre ray all the time.

Step 43: according to θ angle and the φ angle situation of setting, to walk around arm 0 degree to 360 degree scope inward turning, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine, the faultage image obtaining described object under test is rebuild to gathered data for projection.

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

Fixing θ angle, φ angle, at 0 ° to 90 ° range of motion, utilizes described flat panel detector to gather the data for projection of required angle, and rebuilds to gathered data for projection the faultage image obtaining described object under test by computing machine;

Or, in conjunction with under different φ corner condition, θ angle, at 0 ° to 360 ° range of motion, recycles the data for projection that described flat panel detector gathers required angle, and rebuilds to gathered data for projection the faultage image obtaining described object under test by computing machine;

Or in conjunction with under different θ corner condition, φ angle, at 0 ° to 90 ° range of motion, recycles the data for projection that described flat panel detector gathers required angle, and rebuilds to gathered data for projection the faultage image obtaining described object under test by computing machine.

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

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

The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change 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 (6)

1., based on a scanister for computing machine demixing scan imaging CL system, it is characterized in that, 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, for upwards launching cone-beam X-ray;

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

Be provided with described fixed mount directly over described objective table, described fixed mount is connected with described pivoted arm, for fixing described pivoted arm, and makes described pivoted arm do circumference rotary motion, forms 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 on described pivoted arm; And described flat panel detector is in conjunction with its slip on described pivoted arm and the circumference rotary motion of described pivoted arm, is positioned formed hemispherical optional position.

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

Described objective table utilizes the amplification ratio of the motion adjustment object under test in z-axis direction, and utilize x, the interpolation that moves through in y-axis direction realizes circuit orbit motion or other mode of motion to realize scanning projection to described object under test.

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

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

4. based on a detection method for scanister described in claim 1, it is characterized in that, described detection method comprises:

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

The plane at flat panel detector place all the time with oy1 linear vertical, and the angle of x1 axle and x-axis is θ, 0 °≤θ < 360 °; The angle of y1 axle and y-axis is φ, 0 ° of < φ < 90 °; Transformational relation between rotating coordinate system x1y1z1 and three-dimensional coordinate system xyz is:

$\left[\begin{array}{c}x1\\ y1\\ z1\end{array}\right]=\left[\begin{array}{ccc}\cos \left(\mathrm{\&theta;}\right)& \sin \left(\mathrm{\&theta;}\right)& 0\\ -\sin \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&theta;}\right)\sin \left(\mathrm{\&phi;}\right)& \cos \left(\mathrm{\&phi;}\right)\\ \sin \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& -\cos \left(\mathrm{\&theta;}\right)\cos \left(\mathrm{\&phi;}\right)& \sin \left(\mathrm{\&phi;}\right)\end{array}\right]\left[\begin{array}{c}x\\ y\\ z\end{array}\right];$

Utilize scanister measuring targets described in claim 1 to scan, the motion of adjustment objective table in x, y-axis direction, make described object under test be that turning axle moves in a circle with z-axis, and flat panel detector is synchronized with the movement with pivoted arm and described object under test;

According to θ angle and the φ angle situation of setting, to walk around arm 0 degree to 360 degree scope inward turning, utilize described flat panel detector to gather the data for projection of required angle, and by computing machine, the faultage image obtaining described object under test is rebuild to gathered data for projection.

5. detection method as claimed in claim 4, is characterized in that, the described θ angle according to setting and φ angle situation, specifically comprise:

Fixing θ angle, φ angle is at 0 ° to 90 ° range of motion;

Or in conjunction with under different φ corner condition, θ angle is at 0 ° to 360 ° range of motion;

Or in conjunction with under different θ corner condition, φ angle is at 0 ° to 90 ° range of motion.

6. detection method as claimed in claim 4, it is characterized in that, described detection method also comprises:

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

Or the z-axis of adjustment objective table, with the amplification ratio of adjustment System;

Or x, the y-axis of adjustment objective table, be projected in the useful area of described flat panel detector to make the appointed area of described object under test.