CN104298256A - 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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- CN104298256A CN104298256A CN201410599503.5A CN201410599503A CN104298256A CN 104298256 A CN104298256 A CN 104298256A CN 201410599503 A CN201410599503 A CN 201410599503A CN 104298256 A CN104298256 A CN 104298256A
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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 to the method for adjustment of planar array detector spatial attitude in a kind of CT system.The method can be used as the preposition method that CT system structure parameter is measured, and can be used for acquisition and the adjustment of CT system of CT system structure parameter, contributes to improving CT image reconstruction quality.
Background technology
CT(Computed Tomography) be the radiant image Dynamic Non-Destruction Measurement that medical science and industrial circle are conventional.No matter be the tomography CT imaging adopting linear array detector, or adopt the cone-beam CT imaging of planar array detector, want tomography CT image or the three-dimensional CT image of Exact Reconstruction testee, all need to obtain CT system geometries parameter accurately, wherein CT rotation center position, to rebuild the position of true origin, radiographic source be all very important parameter to the distance of detector, radiographic source to the distance, planar array detector torsion angle etc. of rotation center.Because radiographic source is harmful to human body, the accurate spatial locations in ray source focus, rotation center, detector image-forming face cannot directly be measured, thus cannot obtain the exact value of these parameters, have impact on reconstructed image quality.
Especially, in the cone-beam CT system adopting planar array detector, before obtaining these important parameters, need the spatial attitude adjusting planar array detector, make the plane that the imaging surface of planar array detector is formed perpendicular to radiographic source and Work turning table rotation center axis.In CT system, how accurately to determine that the spatial attitude of planar array detector becomes the emphasis of those skilled in the art's research.
Summary of the invention
For prior art Problems existing, the object of the present invention is to provide the method for adjustment of planar array detector spatial attitude in a kind of CT system.
For achieving the above object, technical scheme of the present invention is as follows:
A method of adjustment for planar array detector spatial attitude in CT system, described CT system is with radiographic source, Work turning table and planar array detector; Concrete steps are:
1) two one metal wires are set between described radiographic source and described planar array detector, make two one metal wires be parallel to each other and be spaced from each other, and with the centre of gyration axis being parallel of Work turning table;
2) by radiographic source irradiating step 1) in described two one metal wires, around the axis plane of rotation array detector perpendicular to described centre of gyration axis, until the two piece projection lines of this two one metal wire on planar array detector imaging surface are parallel;
3) two one metal wires are set between described radiographic source and described planar array detector, make two one metal wires be parallel to each other and be spaced from each other, and vertical with the centre of gyration axis of Work turning table;
4) by radiographic source irradiating step 3) in described two one metal wires, around the axis plane of rotation array detector being parallel to described centre of gyration axis, until the two piece projection lines of this two one metal wire on planar array detector imaging surface are parallel, the adjustment of finished surface array detector spatial attitude.
Further, be provided with two one metal wires between described radiographic source and described planar array detector, this two one metal wire uses as two one metal wires in step 1), uses after rotating 90 ° as two one metal wires in step 3).
Further, be provided with four rhizoids between described radiographic source and described planar array detector, wherein two one metal wires are as two one metal wires in step 1), and other two one metal wires are as step 2) in two one metal wires.
Further, the material of described two one metal wires in step 1) and step 3) is gold, silver, molybdenum, tungsten or copper material.
Method of the present invention adjusts the spatial attitude of planar array detector at the projection pitch of the imaging surface of planar array detector according to two parallel silks, first adjust luffing angle and adjust cross torsion angle again, determine the plane of the imaging surface of planar array detector perpendicular to ray source focus and centre of gyration axis place by the adjustment of both direction, there is the features such as Adjustment precision is high, simple operation.
Accompanying drawing explanation
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, for after determining planar array detector spatial attitude, utilizes the schematic diagram of mariages model measurement CT system structure parameter.
Embodiment
Below with reference to the accompanying drawings the present invention is more fully illustrated, shown in the drawings of specific embodiments of the invention.But the present invention can be presented as multiple multi-form, and should not be construed as the specific embodiment being confined to describe here.But, these embodiments are provided, thus make the present invention comprehensively with complete, and scope of the present invention is fully conveyed to those of ordinary skill in the art.
For ease of illustrating, here can use such as " on ", the term of the description such as D score " left side " " right side " relative space relation, for illustration of the element of shown in figure or the feature relation relative to another element or feature.It should be understood that except the orientation shown in figure, spatial terminology is intended to comprise device different azimuth in use or operation.Such as, if the device in figure is squeezed, be stated as the element being positioned at other elements or feature D score will be positioned at other elements or feature " on ".Therefore, exemplary term D score can comprise upper and lower both orientation.Device can otherwise be located (90-degree rotation or be positioned at other orientation), and space used here illustrates relatively can correspondingly explain.
Be the specific embodiment of 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, the concrete scheme of this embodiment is as follows:
As can be seen from Figure 1 CT system is with radiographic source, Work turning table 3 and planar array detector, and ray source focus is s, and the imaging surface of planar array detector is d, and Work turning table 3 possesses a fixing centre of gyration axis O;
Step 1): two one metal wires 1,2 spaced and parallel with the centre of gyration axis O of Work turning table are set between radiographic source with planar array detector;
Step 2): utilize radiographic source to irradiate this two one metal wire 1,2, in two projections do not coincided on the imaging surface d of planar array detector, see Fig. 2; According to the luffing angle of the spacing adjustment planar array detector of the projection of this two one metal wire 1,2, until these two projections are parallel; Projection after adjustment that what in Fig. 2, dotted line referred to is, now the imaging surface d of planar array detector is parallel with centre of gyration axis O; Planar array detector imaging surface d after adjustment that what in Fig. 1, dotted portion referred to is;
Step 3): two one metal wires 4,5 are set between radiographic source and planar array detector, it is parallel to each other and spaced and vertical with the centre of gyration axis O of Work turning table, sees Fig. 3;
Step 4): utilize radiographic source to irradiate this two one metal wire 4,5, the imaging surface d of planar array detector presents two projections do not coincided, see Fig. 4, according to the cross torsion angle of the spacing adjustment planar array detector of the projection of this two one metal wire 4,5, until these two projections are parallel, in Fig. 4, dotted line represents the projection after adjustment, now the imaging surface d of planar array detector is perpendicular to the plane at ray source focus s and centre of gyration axis O place, and in Fig. 3, dotted portion represents the planar array detector imaging surface d after adjustment.
Be that two identical one metal wires rotate 90 ° and form at step 1) and the tinsel 1,2 in step 3) and tinsel 4,5.
Or, tinsel 1,2,4,5 in step 1) and step 3) is made up of four different tinsels, two one metal wires 4,5 angle in 90 ° in two one metal wires 1,2 in step 1) and step 3), requires to choose corresponding pair of metal silk according to step when adjusting planar array detector spatial attitude.
Preferably, the material of tinsel 1,2,4,5 is gold, silver, molybdenum, tungsten or copper material.
Introduce below and how measure CT systematic parameter after determining the spatial attitude of planar array detector, its importance to be described.
As shown in Figure 5, with radiographic source, Work turning table, planar array detector in CT system, Work turning table is between radiographic source and planar array detector, the centre of gyration axis O of Work turning table is parallel with the imaging surface d of planar array detector, and ray source focus s is vertical with the imaging surface d of planar array detector with centre of gyration axis O place plane; Mariages model is provided with two spaced and tinsel A, B of being parallel to each other; Measuring process is:
1) mariages model is arranged on the Work turning table in CT system, makes two one metal wire A, B on mariages model parallel with the centre of gyration axis O of Work turning table, and make centre of gyration axis O be positioned at outside two one metal wire A, B place planes;
2) Work turning table in rotating CT system, two one metal wire A, B are rotated around centre of gyration axis O within the scope of 360 °, period certainly exists two positions, two one metal wire A and B of these two positions and ray source focus s are in the same plane, one of them position B is between A and s, and another position A is between B and s.When rotating to this two positions, A, B projection on the projecting plane d of detector overlaps, the projection of two one metal wire A and B on the projecting plane d of detector is respectively P1 and P2, therefrom can know the distance P1P2 that P1, P2 two projects, P0 is the mid point of P1P2, records the revolution angle α of this twice projection overlapping positions.When installing mariages model, easily know the distance r of two one metal wire A, B place plane separation centre of gyration axis O.The space D so=r/cos (α/2) of centre of gyration axis O and ray source focus s; The imaging surface d of detector and the space D sd=P0P1/cos (α/2) of ray source focus s.
Claims (4)
1. the method for adjustment of planar array detector spatial attitude in CT system, 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, make two one metal wires be parallel to each other and be spaced from each other, and with the centre of gyration axis being parallel of Work turning table;
2) by radiographic source irradiating step 1) in described two one metal wires, around the axis plane of rotation array detector perpendicular to described centre of gyration axis, until the two piece projection lines of this two one metal wire on planar array detector imaging surface are parallel;
3) two one metal wires are set between described radiographic source and described planar array detector, make two one metal wires be parallel to each other and be spaced from each other, and vertical with the centre of gyration axis of Work turning table;
4) by radiographic source irradiating step 3) in described two one metal wires, around the axis plane of rotation array detector being parallel to described centre of gyration axis, until the two piece projection lines of this two one metal wire on planar array detector imaging surface are parallel, the adjustment of finished surface array detector spatial attitude.
2. method of adjustment as claimed in claim 1, it is characterized in that, be provided with two one metal wires between described radiographic source and described planar array detector, this two one metal wire uses as two one metal wires in step 1), uses after rotating 90 ° as two one metal wires in step 3).
3. method of adjustment as claimed in claim 1, it is characterized in that, be provided with four rhizoids between described radiographic source and described planar array detector, wherein two one metal wires are as two one metal wires in step 1), and other two one metal wires are as step 2) in two one metal wires.
4. the method for adjustment as described in as arbitrary in claim 1-3, is characterized in that, the material of described two one metal wires in step 1) and step 3) is gold, silver, molybdenum, tungsten or copper material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108459343A (en) * | 2017-12-19 | 2018-08-28 | 成都飞机工业（集团）有限责任公司 | A kind of beam angle measurement method |
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| 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 |
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Patent Citations (5)
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| 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 |
| US20140211925A1 (en) * | 2013-01-31 | 2014-07-31 | Ge Medical Systems Global Technology Company, Llc | Geometry calibration algorithm for large flat module detector ct scanner |
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| CN108459343A (en) * | 2017-12-19 | 2018-08-28 | 成都飞机工业（集团）有限责任公司 | A kind of beam angle measurement method |
| CN108459343B (en) * | 2017-12-19 | 2021-11-30 | 成都飞机工业（集团）有限责任公司 | Ray bundle angle testing method |
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