CN104406989A - Double wire model-based CT system structure parameter measuring method and apparatus thereof - Google Patents
Double wire model-based CT system structure parameter measuring method and apparatus thereof Download PDFInfo
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Abstract
The invention discloses a double wire model-based CT system structure parameter measuring method and an apparatus thereof. The axis of a CT rotation center, the position of a reconstructed coordinate origin, a distance from a ray source to a detector, a distance from the ray source to the rotation center, the torsion angle of an area array detector, and other CT system structure parameters are calculated by obtaining the projection positions of two metal wires paralleling to a rotating shaft on the detector under the specific rotation position in a CT system and the relationship of the positions. The method is simple and practical, is suitable for the CT system of line array and area array detectors, can be used to obtain the CT system structure parameters and calibrate the CT system, and is helpful for improving the reconstructed CT image quality.
Description
Technical field
The present invention relates to a kind of CT system structure parameter measuring method and device, particularly a kind of CT system structure parameter measuring method based on mariages model and device, belong to CT technical field.The method is by a kind of device comprising two parallel wires, in the mode making tinsel parallel with the turning axle of CT turntable, this device is fixed on turntable, along with CT turntable rotates, obtaining two one metal wires projected position on the detector and position relationship respectively, obtaining CT system geometries parameter by calculating.The method is simple and practical, 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 the accurate spatial locations in ray source focus, rotation center, detector image-forming face cannot directly be measured, thus the exact value of these parameters cannot be obtained, have impact on reconstructed image quality.
The method of existing acquisition CT system structure parameter mainly contains: process of iteration, least squares estimate, sinogram method and two (many) ball etc.There is following problem in these methods: calculated amount is large; Need to carry out iteration, iterative process does not restrain some parameter; Some method can only obtain partial parameters; Some method is only applicable to linear array or face battle array; Need the additional act such as translation, lifting.Therefore, need a kind of special technological means and method, above-mentioned parameter is measured.
Summary of the invention
For prior art Problems existing, the object of the present invention is to provide a kind of CT system structure parameter measuring method based on mariages model, the method is by simple step and computation process, the geometric parameter of accurate acquisition CT system architecture, both can be applicable to the tomography CT system adopting linear array detector, also can be applicable to adopt in the cone-beam CT system of planar array detector, thus instruct the adjustment of CT system, improve CT image reconstruction quality.In addition, present invention also offers a kind of mariages model equipment for described measuring method.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of CT system structure parameter measuring method based on mariages model, described CT system is with radiographic source, Work turning table, planar array detector, the centre of gyration axis of described Work turning table is parallel with the imaging surface of planar array detector, and ray source focus is vertical with the imaging surface of planar array detector with described centre of gyration axis place plane; Described method utilizes mariages model to measure CT system structure parameter, mariages model is provided with two spaced and tinsels be parallel to each other; Measuring process is:
1) mariages model is placed on CT Work turning table, makes the centre of gyration axis being parallel of two one metal wires on mariages model and Work turning table, and make centre of gyration axis be positioned at outside described two one metal wire place planes;
2) CT Work turning table is rotated, according to the geometric relationship of two one metal wires, described centre of gyration axis, two one metal wires projection three on the detector, by the spacing of the spacing and detector image-forming face and ray source focus that calculate CT Work turning table centre of gyration axis and ray source focus.
Further, described step 2) be specially: rotate CT Work turning table, twice projection on the detector in 360 ° of revolution range of described two one metal wires is overlapped, record the revolution angle of this twice projection overlapping positions, the spacing of the Distance geometry two one metal wire projection on the detector of centre of gyration axis according to described revolution angle, two one metal wire place plane separations, calculates the spacing of CT Work turning table centre of gyration axis and ray source focus and the spacing of detector image-forming face and ray source focus.
Further, described two one metal wires are equal with described centre of gyration axial line distance, described step 2) be specially: rotate CT Work turning table, obtain the two one metal wires primary importance that projection pitch is maximum on the imaging surface of detector in 360 ° of revolution range, be that starting point makes CT turntable rotate 180 ° to obtain the second place again with primary importance, according to two one metal wires in primary importance, the distance of the centre of gyration described in the spacing of projection on the detector during the second place and two one metal wire place plane separations, and two distances of one metal wire, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
Further, the imaging surface of described planar array detector is provided with two-dimensional coordinate system, according to the slope be projected in described coordinate system of two one metal wires described on this imaging surface, calculate the windup-degree of imaging surface in the plane perpendicular to described ray source focus and described centre of gyration axis place of planar array detector.
A kind of CT system structure parameter measuring method based on mariages model, described CT system is with radiographic source, Work turning table, linear array detector, the centre of gyration of described Work turning table is vertical with the length direction of the strip imaging surface of linear array detector, and ray source focus is vertical with the strip imaging surface of linear array detector with described centre of gyration axis place plane; Described method utilizes mariages model to measure CT system structure parameter, mariages model is provided with two silks be parallel to each other; Measuring process is:
1) mariages model is placed on CT Work turning table, makes two one metal wires on mariages model parallel with the centre of gyration of Work turning table, and make centre of gyration axis be positioned at outside described two one metal wire place planes;
2) CT Work turning table is rotated, according to the geometric relationship of two one metal wires, described centre of gyration axis, two one metal wires projection three on the detector, by calculating the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
Further, described step 2) be specially: rotate CT Work turning table, twice projection on the detector in 360 ° of revolution range of described two one metal wires is overlapped, record the revolution angle of this twice projection overlapping positions, the spacing of the Distance geometry two one metal wire projection on the detector of centre of gyration axis according to described revolution angle, two one metal wire place plane separations, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
Further, described two one metal wires are equal with described centre of gyration axial line distance, described step 2) be specially: rotate CT Work turning table, obtain the two one metal wires primary importance that projection pitch is maximum on the imaging surface of detector in 360 ° of revolution range, be that starting point makes CT turntable rotate 180 ° to obtain the second place again with primary importance, according to two one metal wires in primary importance, the distance of the centre of gyration described in the spacing of projection on the detector during the second place and two one metal wire place plane separations, and two distances of one metal wire, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
A kind of mariages model for above-mentioned measuring method, this mariages model comprises shell, two tinsels be parallel to each other are arranged at intervals with in cavity pocket of outer cover, outer surface of outer cover is provided with for the spindle nose that be connected concentric on the Work turning table in CT system, this spindle nose axis is parallel with two one metal wires and be positioned at outside two one metal wire place planes.
Further, described shell is combined by the cylindrical drum of both ends open and the end cap at cylindrical shell two ends, and described two one metal wires are arranged between two end cap, and described spindle nose is arranged on the outside surface of one of them end cap, and this spindle nose is concentric with cylindrical shell.
Further, the two end cap of described cylindrical shell is provided with mounting hole, described tinsel wears and is fixed in described mounting hole.
Further, described cylindrical shell both ends of the surface are provided with locating slot, the inside surface of described two end cap being provided with location fin or positioning strip, by making the location fin on end cap or positioning strip match with the locating slot in body end surface, making the described position of mounting hole in two end cap relative.
Further, described tinsel is gold, silver, molybdenum, tungsten or copper material.
Further, described cylindrical shell is PC or ABS material.
The structural parameters that the present invention had both been applicable to Cone-Beam CT obtain, and are also applicable to linear array CT.In measuring process, only need to rotate mariages model equipment, and without the need to carrying out the operation such as translation, lifting; Simple geometry is only needed to calculate, and without the need to the iterative computation of complexity; Source projection coordinate on the detector, source-rotation center distance, source-detector distance can be obtained simultaneously, and the torsion angle of planar array detector.Adopt method of the present invention and mariages model equipment, the acquisition process of whole CT system structure parameter can be completed by program completely automatically, does not need manual intervention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the first measuring method of CT system structure parameter that the present invention is based on mariages model;
Fig. 2 is the schematic diagram of the CT system structure parameter the second measuring method that the present invention is based on mariages model;
Fig. 3 is the schematic diagram of the imaging surface windup-degree of measuring surface array detector;
Fig. 4 is the structural representation of mariages model equipment in the present invention;
Fig. 5 is the schematic diagram of Fig. 4 middle cylinder body;
Fig. 6 is the schematic diagram of bottom end cover in Fig. 4.
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.
Embodiment 1
Embodiment 1 carries out situation about measuring for planar array detector cone-beam CT system based on the first measuring method of CT system structure parameter of mariages model in the present invention, describes in detail below in conjunction with Fig. 1.
Radiographic source, Work turning table, planar array detector is comprised 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 silk 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, and 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, the distance r of two one metal wire A, B place plane separation centre of gyration axis O can be known.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.
Embodiment 2
Embodiment 2 is situations that the first measuring method of CT system structure parameter that the present invention is based on mariages model carries out for linear array detector CT system measuring, substantially the same manner as Example 1, difference is, planar array detector is different from the shape of the imaging surface of linear array detector, linear array detector is strip imaging surface, therefore in embodiment 1, 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 strip imaging surface d of linear array detector with centre of gyration axis O place plane in example 2.
Embodiment 3
Embodiment 3 is situations that the CT system structure parameter the second measuring method that the present invention is based on mariages model carries out for planar array detector cone-beam CT system measuring, and describes in detail below in conjunction with Fig. 2.
Radiographic source, Work turning table, planar array detector is comprised 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 silk A, B of 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 parallel with the centre of gyration axis O of Work turning table, and centre of gyration axis O is positioned at outside two one metal wire A, B place planes, two one metal wire A, B and centre of gyration axis O are apart from equal;
2) Work turning table of rotating CT system, make two one metal wire A, B rotates around centre of gyration axis O within the scope of 360 °, period certainly exists two positions, first determine two one metal wire A, the B primary importance that projection pitch is maximum on the imaging surface d of detector, be that starting point makes CT turntable rotate 180 ° to obtain the second place again with primary importance, two one metal wire A in primary importance, B is projected as P5 on the projecting plane d of detector, P6, two A in the second place, B is projected as P3 on the projecting plane d of detector, P4, the inevitable plane perpendicular to ray source focus s and centre of gyration axis O place of the plane at two one metal wire A of these two positions and B place, therefrom can know projection P 3, the distance P3P4 of P4, projection P 5, the distance P5P6 of P6, P0 is the mid point of P3P4, also be the mid point of P5P6, when installing mariages model, easily know two one metal wire A, the distance r of B place plane separation centre of gyration axis O, and two one metal wire A, the distance AB of B.Simultaneous
formula 1:
with formula 2:
Calculate space D so of centre of gyration axis O and ray source focus s; The imaging surface d of detector and the space D sd of ray source focus s.
Embodiment 4
Embodiment 4 is situations that the CT system structure parameter the second measuring method that the present invention is based on mariages model carries out for linear array detector CT system measuring, substantially the same manner as Example 3, difference is, planar array detector is different from the shape of the imaging surface of linear array detector, linear array detector is strip imaging surface, therefore in embodiment 1, 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 strip imaging surface d of linear array detector with centre of gyration axis O place plane in example 2.
In embodiment 1 and embodiment 3, the imaging surface d of planar array detector is provided with two-dimensional coordinate system, composition graphs 3, according to projection A ', the B ' slope k in a coordinate system of two one metal wires described on this imaging surface, calculate windup-degree θ=arctan (k) of imaging surface in the plane perpendicular to ray source focus s and centre of gyration axis O place of planar array detector.
By the parameter obtained by above-mentioned measuring method, adjustment is carried out to CT system, contribute to improving CT image reconstruction quality.
Mariages model equipment used in above-mentioned measuring method is specifically introduced below in conjunction with accompanying drawing 4, Fig. 5 and Fig. 6.This mariages model equipment comprises shell and tinsel, and described shell is combined by the cylindrical shell 1 of both ends open and the end cap 2 and 3 at cylindrical shell 1 two ends; Cylindrical shell 1 is cylindrical shape, and its upper and lower two end faces are separately installed with upper end cover 2 and bottom end cover 3; Cylindrical shell 1 inner chamber is arranged with two one metal wire A and B in the axial direction in parallel, and the axis of tinsel A and B and cylindrical shell 1 is not in same plane.Upper end cover 2 and bottom end cover 3 are respectively arranged with the pilot hole 6 and 7 for fixing metal silk A and B, the lower surface of bottom end cover 3 is provided with and for same turntable, fixing spindle nose 8 is installed, the mode on turntable is plugged on by spindle nose 8, make the axis of rotation of this device and the rotation axis coincident of turntable, and this device can be rotated with turntable.The upper and lower end face of cylindrical shell 1 is provided with locating slot 5, upper end cover 2 and bottom end cover 3 are provided with the fixing positioning strip 4 of the holding that to match with locating slot 5 or fin on the end face of cylindrical shell.Preferably, tinsel A and B is gold, silver, molybdenum, tungsten or copper isodensity is large, ductility is good metal material; Cylindrical shell 1 is organic light materials such as PC or ABS.
Claims (10)
1. the CT system structure parameter measuring method based on mariages model, described CT system is with radiographic source, Work turning table, planar array detector, it is characterized in that, the centre of gyration axis of described Work turning table is parallel with the imaging surface of planar array detector, and ray source focus is vertical with the imaging surface of planar array detector with described centre of gyration axis place plane; Described method utilizes mariages model to measure CT system structure parameter, mariages model is provided with two spaced and silks be parallel to each other; Measuring process is:
1) mariages model is placed on CT Work turning table, makes the centre of gyration axis being parallel of two one metal wires on mariages model and Work turning table, and make centre of gyration axis be positioned at outside described two one metal wire place planes;
2) CT Work turning table is rotated, according to the geometric relationship of two one metal wires, described centre of gyration axis, two one metal wires projection three on the detector, by calculating the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
2. measuring method as claimed in claim 1, it is characterized in that, described step 2) be specially: rotate CT Work turning table, twice projection on the detector in 360 ° of revolution range of described two one metal wires is overlapped, record the revolution angle of this twice projection overlapping positions, according to described revolution angle, the spacing of the Distance geometry two one metal wire projection on the detector of centre of gyration axis described in two one metal wire place plane separations, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
3. measuring method as claimed in claim 1, it is characterized in that, described two one metal wires are equal with described centre of gyration axial line distance, described step 2) be specially: rotate CT Work turning table, obtain the two one metal wires primary importance that projection pitch is maximum on the imaging surface of detector in 360 ° of revolution range, be that starting point makes CT turntable rotate 180 ° to obtain the second place again with primary importance, according to two one metal wires in primary importance, the distance of the centre of gyration described in the spacing of projection on the detector during the second place and two one metal wire place plane separations, and two distances of one metal wire, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
4. measuring method as claimed in claim 2, it is characterized in that, the imaging surface of described planar array detector is provided with two-dimensional coordinate system, according to the slope be projected in described coordinate system of two one metal wires described on this imaging surface, calculate the windup-degree of imaging surface in the plane perpendicular to described ray source focus and described centre of gyration axis place of planar array detector.
5. the CT system structure parameter measuring method based on mariages model, described CT system is with radiographic source, Work turning table, linear array detector, it is characterized in that, the centre of gyration of described Work turning table is vertical with the length direction of the strip imaging surface of linear array detector, and ray source focus is vertical with the strip imaging surface of linear array detector with described centre of gyration axis place plane; Described method utilizes mariages model to measure CT system structure parameter, mariages model is provided with two silks be parallel to each other; Measuring process is:
1) mariages model is placed on CT Work turning table, makes two one metal wires on mariages model parallel with the centre of gyration of Work turning table, and make centre of gyration axis be positioned at outside described two one metal wire place planes;
2) CT Work turning table is rotated, according to the geometric relationship of two one metal wires, described centre of gyration axis, two one metal wires projection three on the detector, by calculating the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
6. measuring method as claimed in claim 5, it is characterized in that, described step 2) be specially: rotate CT Work turning table, twice projection on the detector in 360 ° of revolution range of described two one metal wires is overlapped, record the revolution angle of this twice projection overlapping positions, according to described revolution angle, the spacing of the Distance geometry two one metal wire projection on the detector of centre of gyration axis described in two one metal wire place plane separations, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
7. measuring method as claimed in claim 5, it is characterized in that, two described one metal wires are equal with described centre of gyration axial line distance, described step 2) be specially: rotate CT Work turning table, obtain the two one metal wires primary importance that projection pitch is maximum on the imaging surface of detector in 360 ° of revolution range, be that starting point makes CT turntable rotate 180 ° to obtain the second place again with primary importance, according to two one metal wires in primary importance, the distance of the centre of gyration described in the spacing of projection on the detector during the second place and two one metal wire place plane separations, and two distances of one metal wire, calculate the spacing of CT Work turning table centre of gyration axis and ray source focus, and the spacing of detector image-forming face and ray source focus.
8. the mariages model equipment for measuring method as described in any one of claim 1-7, it is characterized in that, this mariages model equipment comprises shell, two tinsels be parallel to each other are arranged at intervals with in cavity pocket of outer cover, outer surface of outer cover is provided with for the spindle nose that be connected concentric on the Work turning table in CT system, this spindle nose axis is parallel with two one metal wires and be positioned at outside two one metal wire place planes.
9. mariages model equipment as claimed in claim 8, it is characterized in that, described shell is combined by the cylindrical drum of both ends open and the end cap at cylindrical shell two ends, described two one metal wires are arranged between two end cap, described spindle nose is arranged on the outside surface of one of them end cap, and this spindle nose is concentric with cylindrical shell.
10. mariages model equipment as claimed in claim 9, it is characterized in that, the two end cap of described cylindrical shell is provided with mounting hole, described tinsel wears and is fixed in described mounting hole.
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