CN104298256B - Adjustment method for spatial attitude of area array detector in CT system - Google Patents
Adjustment method for spatial attitude of area array detector in CT system Download PDFInfo
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- CN104298256B CN104298256B CN201410599503.5A CN201410599503A CN104298256B CN 104298256 B CN104298256 B CN 104298256B CN 201410599503 A CN201410599503 A CN 201410599503A CN 104298256 B CN104298256 B CN 104298256B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 54
- 238000003384 imaging method Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 241001416181 Axis axis Species 0.000 claims 2
- 230000005855 radiation Effects 0.000 abstract 3
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013170 computed tomography imaging Methods 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Analysing Materials By The Use Of Radiation (AREA)
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Abstract
The invention discloses an adjustment method for spatial attitude of an area array detector in a CT system. The CT system is provided with a radiation source, a working rotary table and the area array detector, two metal wires in parallel are arranged between the area array detector and the radiation source, and by means of the distance between projections, at the position parallel to the axis of the gyration center of the working rotary table, of the metal wires and projections, at the position perpendicular to the axis of the gyration center of the working rotary table, of the metal wires, the spatial attitude of the area array detector is adjusted until the imaging face of the area array detector is perpendicular to the plane where the focus of the radiation source and the axis of the gyration center are located.
Description
Technical field
The present invention relates in a kind of CT system planar array detector spatial attitude method of adjustment.The method can be used as CT system
The preposition method of structural parameters measurement, can be used for acquisition and the CT system adjustment of CT system structural parameters, is favorably improved CT figure
As reconstruction quality.
Background technology
CT（Computed Tomography）It is the radiant image Dynamic Non-Destruction Measurement that medical science and industrial circle are commonly used.No
By be using linear array detector tomography CT imaging, or using planar array detector cone-beam CT imaging, Exact Reconstruction tested
The tomography CT image of object or three-dimensional CT image, are required for obtaining accurate CT system geometrical structure parameter, in wherein CT rotation
Heart position, the position rebuilding the origin of coordinates, the distance of radiographic source to detector, the distance of radiographic source to pivot, face battle array are visited
Surveying device torsion angle etc. is all very important parameter.Because radiographic source is harmful to human body, ray source focus, pivot, detector
The accurate spatial locations of imaging surface cannot direct measurement, thus the exact value of these parameters cannot be obtained, have impact on reconstruction image
Quality.
Especially in the cone-beam CT system using planar array detector, before obtaining these important parameters, need adjustment face battle array
The spatial attitude of detector, makes the imaging surface of planar array detector constitute perpendicular to radiographic source and Work turning table center of rotation axis
Plane.How accurately to determine that the spatial attitude of planar array detector becomes the emphasis of those skilled in the art's research in CT system.
Content of the invention
The problem existing for prior art, it is an object of the invention to provide planar array detector space in a kind of CT system
The method of adjustment of attitude.
For achieving the above object, technical scheme is as follows：
The method of adjustment of planar array detector spatial attitude in a kind of CT system, described CT system carries radiographic source, work turns
Platform and planar array detector；Concretely comprise the following steps：
1）Two one metal wires are set between described radiographic source and described planar array detector, so that two one metal wires is parallel to each other
And be spaced from each other, and parallel with the gyration central axis of Work turning table；
2）With radiographic source irradiating step 1）In described two one metal wires, around the axis perpendicular to described gyration central axis
Rotate planar array detector, until two projection lines on planar array detector imaging surface for this two one metal wire are parallel；
3）Two one metal wires are set between described radiographic source and described planar array detector, so that two one metal wires is parallel to each other
And be spaced from each other, and vertical with the gyration central axis of Work turning table；
4）With radiographic source irradiating step 3）In described two one metal wires, around the axis parallel to described gyration central axis
Rotate planar array detector, until two projection lines on planar array detector imaging surface for this two one metal wire are parallel, finished surface battle array
The adjustment of detector spatial attitude.
Further, it is provided with two one metal wires between described radiographic source and described planar array detector, this two one metal wire is made
For step 1）In two one metal wires use, rotate 90 ° after as step 3）In two one metal wires use.
Further, it is provided with four silks, wherein two one metal wire conducts between described radiographic source and described planar array detector
Step 1）In two one metal wires, in addition two one metal wires are as step 2）In two one metal wires.
Further, step 1）With step 3）In the material of described two one metal wires be gold, silver, molybdenum, tungsten or copper material.
According to two parallel silks, the projection pitch of the imaging surface in planar array detector adjusts face battle array spy to the method for the present invention
Survey the spatial attitude of device, first adjustment luffing angle adjusts cross torsion angle again, determines face battle array by the adjustment of both direction
The plane that the imaging surface of detector is located with gyration central axis perpendicular to ray source focus, has Adjustment precision height, operation just
Prompt the features such as.
Brief description
Fig. 1 is the schematic diagram of the luffing angle adjusting planar array detector in the present invention；
Fig. 2 is the projection of two one metal wires in planar array detector imaging surface in Fig. 1；
Fig. 3 is the schematic diagram of the cross torsion angle adjusting planar array detector in the present invention；
Fig. 4 is the projection of two one metal wires in planar array detector imaging surface in Fig. 3；
Fig. 5 is after determining planar array detector spatial attitude, using the signal of mariages model measurement CT system structural parameters
Figure.
Specific embodiment
Below with reference to the accompanying drawings the present invention is more fully illustrated, shown in the drawings of the specific embodiment of the present invention.
However, the present invention can be presented as multiple multi-forms, it is not construed as the specific embodiment being confined to describe here.And
It is to provide these embodiments, so that the present invention is fully and completely, and will fully convey the scope of the invention to this area
Those of ordinary skill.
For ease of explanation, here can using " on ", D score " left " " right " etc. relative space relation is described
Term, for shown in explanatory diagram a element or feature with respect to another element or feature relation.It should be appreciated that
It is that, in addition to the orientation shown in except in figure, spatial terminology is intended to the different azimuth in use or operation including device.Example
As if the device of in figure is squeezed, being stated as the element positioned at other elements or feature D score and will be located into other elements
Or feature " on ".Therefore, exemplary term D score can comprise both upper and lower orientation.Device can otherwise position
（Ratate 90 degrees or be located at other orientation）, can correspondingly explain used herein of space explanation relatively.
It is the method for adjustment of planar array detector spatial attitude in CT system of the present invention as shown in Figure 1, Figure 2, Figure 3 and Figure 4
Specific embodiment, the concrete scheme of this embodiment is as follows：
As can be seen from Figure 1 CT system carries radiographic source, Work turning table 3 and planar array detector, and ray source focus are s,
The imaging surface of planar array detector is d, and Work turning table 3 possesses fixing gyration central axis O；
Step 1）：The spaced and and Work turning table of two one metal wire 1,2 is set between radiographic source and planar array detector
Gyration central axis O parallel；
Step 2）：Irradiate this two one metal wire 1,2 using radiographic source, on the imaging surface d of planar array detector in two not
The projection coinciding, is shown in Fig. 2；The spacing of the projection according to this two one metal wire 1,2 adjusts the luffing angle of planar array detector, directly
Parallel to this two projections；What in Fig. 2, dotted line referred to is the projection after adjusting, the now imaging surface d of planar array detector and revolution
Central axis O is parallel；That in Fig. 1, dotted portion refers to is the planar array detector imaging surface d after adjusting；
Step 3）：Two one metal wires 4,5 are set between radiographic source and planar array detector, and it is parallel to each other and spaced
And vertical with gyration central axis O of Work turning table, see Fig. 3；
Step 4）：Irradiate this two one metal wire 4,5 using radiographic source, the imaging surface d of planar array detector presents two
The individual projection not coincided, is shown in Fig. 4, and the spacing of the projection according to this two one metal wire 4,5 adjusts the horizontal torsion of planar array detector
Gyration, until this two projections are parallel, in Fig. 4, dotted line represents the projection after adjustment, and now the imaging surface d of planar array detector hangs down
The straight plane being located with gyration central axis O in ray source focus s, in Fig. 3, dotted portion represents the planar array detector after adjustment
Imaging surface d.
In step 1）With step 3）In wire 1,2 and wire 4,5 for identical two one metal wire rotate 90 ° and
Become.
Or, in step 1）With step 3）In wire 1,2,4,5 be made up of four different wires, in step 1）
In two one metal wires 1,2 and step 3）In two one metal wires 4,5 angles in 90 °, adjustment planar array detector spatial attitude
When according to step require choose corresponding a pair of wire.
Preferably, the material of wire 1,2,4,5 is gold, silver, molybdenum, tungsten or copper material.
It is described below and how to measure CT system parameter after determining the spatial attitude of planar array detector, to illustrate that it is heavy
The property wanted.
As shown in figure 5, in CT system carry radiographic source, Work turning table, planar array detector, Work turning table be located at radiographic source and
Between planar array detector, gyration central axis O of Work turning table are parallel with the imaging surface d of planar array detector, ray source focus s and
Gyration central axis O place plane is vertical with the imaging surface d of planar array detector；Be provided with mariages model two spaced and
Wire A, the B being parallel to each other；Measuring process is：
1）Mariages model is arranged on the Work turning table in CT system, make two one metal wire A, B on mariages model with
Gyration central axis O of Work turning table are parallel, and so that gyration central axis O is located at outside two one metal wire A, B place planes；
2）Work turning table in rotating CT system, makes two one metal wire A, B around gyration central axis O in the range of 360 °
Rotation, period certainly exists two positions, and two one metal wire A and B and ray source focus s of this two positions are in same plane
On, one of position B is between A and s, and another position A is between B and s.When rotating to this two positions, A, B are visiting
Survey device perspective plane d on projection overlap, projection on the perspective plane d of detector for two one metal wire A and B be respectively P1 and
P2, can therefrom know P1, P2 two projection apart from P1P2, P0 is the midpoint of P1P2, records this and projects overlapping positions twice
Revolution angle α.Install mariages model when, easily know two one metal wire A, B place plane separation gyration central axis O away from
From r.Gyration central axis O and space D so=r/cos (α/2) of ray source focus s；The imaging surface d of detector is burnt with radiographic source
Space D sd=P0P1/cos (α/2) of point s.
Claims (4)
1. in a kind of CT system planar array detector spatial attitude method of adjustment, described CT system comprises radiographic source, Work turning table
And planar array detector；It is characterized in that, the step of this method is：
1）Two one metal wires are set between described radiographic source and described planar array detector, so that two one metal wires is parallel to each other and phase
Mutually it is spaced apart, and parallel with the gyration central axis of Work turning table；
2）With radiographic source irradiating step 1）In described two one metal wires, around perpendicular to described gyration central axis axis rotate
Planar array detector, until two projection lines on planar array detector imaging surface for this two one metal wire are parallel；
3）Two one metal wires are set between described radiographic source and described planar array detector, so that two one metal wires is parallel to each other and phase
Mutually it is spaced apart, and vertical with the gyration central axis of Work turning table；
4）With radiographic source irradiating step 3）In described two one metal wires, around parallel to described gyration central axis axis rotate
Planar array detector, until two projection lines on planar array detector imaging surface for this two one metal wire are parallel, finished surface battle array detects
The adjustment of device spatial attitude.
2. method of adjustment as claimed in claim 1 is it is characterised in that arrange between described radiographic source and described planar array detector
There are two one metal wires, this two one metal wire is as step 1）In two one metal wires use, rotate 90 ° after as step 3）In
Two one metal wires use.
3. method of adjustment as claimed in claim 1 is it is characterised in that arrange between described radiographic source and described planar array detector
There are four one metal wires, wherein two one metal wires are as step 1）In two one metal wires, in addition two one metal wires are as step 3）
In two one metal wires.
4. described method of adjustment as arbitrary in claim 1-3 is it is characterised in that step 1）With step 3）In described two gold
The material belonging to silk is gold, silver, molybdenum, tungsten or copper material.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7224763B2 (en) * | 2004-07-27 | 2007-05-29 | Analogic Corporation | Method of and system for X-ray spectral correction in multi-energy computed tomography |
| CN101126722A (en) * | 2007-09-30 | 2008-02-20 | 西北工业大学 | Cone-beam CT beam hardening calibration method based on registration model emulation |
| CN103006251A (en) * | 2012-12-06 | 2013-04-03 | 深圳先进技术研究院 | Calibration phantom, calibration device and calibration method for calibrating geometric parameters in CT (Computed Tomography) system |
| CN103759679A (en) * | 2013-11-04 | 2014-04-30 | 杭州长庚测量技术有限公司 | Measuring method for angular deviation of cone-beam CT system |
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| CN103969269B (en) * | 2013-01-31 | 2018-09-18 | Ge医疗系统环球技术有限公司 | Method and apparatus for geometric calibration CT scanner |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7224763B2 (en) * | 2004-07-27 | 2007-05-29 | Analogic Corporation | Method of and system for X-ray spectral correction in multi-energy computed tomography |
| CN101126722A (en) * | 2007-09-30 | 2008-02-20 | 西北工业大学 | Cone-beam CT beam hardening calibration method based on registration model emulation |
| CN103006251A (en) * | 2012-12-06 | 2013-04-03 | 深圳先进技术研究院 | Calibration phantom, calibration device and calibration method for calibrating geometric parameters in CT (Computed Tomography) system |
| CN103759679A (en) * | 2013-11-04 | 2014-04-30 | 杭州长庚测量技术有限公司 | Measuring method for angular deviation of cone-beam CT system |
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