CN211825776U

CN211825776U - Adjustable double-ball calibration device for CT system

Info

Publication number: CN211825776U
Application number: CN202020219608.4U
Authority: CN
Inventors: 孙艳敏; 闫镔; 李磊; 韩玉; 席晓琦; 梁宁宁; 杨成凯; 王宇胜; 亢冠宇
Original assignee: Information Engineering University of PLA Strategic Support Force
Current assignee: Information Engineering University of PLA Strategic Support Force
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-10-30
Anticipated expiration: 2030-02-27

Abstract

The utility model relates to the technical field of CT system parameter calibration, in particular to an adjustable double-ball calibration device of a CT system, which comprises a base; the fixed tube is vertically arranged on the base, and a scale is carved on one side of the tube body of the fixed tube; the first ball body is fixedly embedded at the lower part of the fixed pipe; and the second sphere is positioned above the first sphere, and the distance between the second sphere and the first sphere is adjustable. The utility model discloses not only can be convenient adjust two ball intervals, application scope is wide, can read the distance of two balls through the scale moreover, need not artifical the measurement once more, has also avoided the error because of measuring the angle and causing.

Description

Adjustable double-ball calibration device for CT system

Technical Field

The utility model relates to a CT (computed tomogry, X-ray electron computer tomography) system parameter calibration technical field, concretely relates to two ball calibration devices of CT system with adjustable.

Background

The CT system plays an important role in the fields of nondestructive testing, industrial flaw detection, reverse engineering and the like. CT is made by using X-ray tomography, receiving by electro-photon detector, converting the signal into digital signal, inputting into computer, and converting into image by computer. Generally, a CT system includes an X-ray source, a stage, and a detector.

In the process of reconstructing a three-dimensional image of an actual scanned object, some geometric parameters of a projection image during shooting, such as the distance from an X-ray source to the scanned object, the distance from a detector, the position of a rotation center line, and the like, need to be acquired. The commonly used double-ball calibration device at present has high calibration precision and high calibration speed, but has the following defects: 1. the positions of the two spheres are fixed, and when different sphere distances are needed, the calibration rod needs to be replaced, so that the practical application scene is limited, and 2, even if the distance between the two spheres is adjustable, the use method is inconvenient.

Disclosure of Invention

In order to solve the problem that exists among the prior art, the utility model aims at providing a CT system two balls calibration device with adjustable, not only can be convenient adjust two ball intervals, application scope is wide, can read the distance of two balls through the scale moreover, need not manual measurement once more, has also avoided the error because of measuring the angle and causing.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a CT system two ball calibration device with adjustable, include:

a base;

the fixed tube is vertically arranged on the base, and a scale is carved on one side of the tube body of the fixed tube;

the first ball body is embedded in the lower part of the fixed pipe;

and the second sphere is positioned above the first sphere, and the distance between the second sphere and the first sphere is adjustable.

Furthermore, the first sphere and the second sphere are both stainless steel balls, and the base and the fixing tube are both organic glass.

Furthermore, a plurality of round holes are formed in one side of the fixed pipe body at equal intervals from top to bottom, the diameter of each round hole is slightly larger than that of the second sphere, a semicircular ball groove used for containing the second sphere is connected to the tail end of each round hole, the diameter of each ball groove is the same as that of the second sphere, and each ball groove is located right above the first sphere.

Furthermore, a rod groove is formed in the fixed pipe body and located above the first ball body, a rod core matched with the rod groove is movably arranged in the rod groove, and a second ball body is embedded in the lower portion of the rod core.

Further, the centers of the first sphere and the second sphere are located on the same vertical line.

Further, the rod groove is in threaded connection with the rod core, internal threads are arranged inside the rod groove, and external threads are arranged outside the rod core.

Further, the lower extreme both sides of fixed pipe body are equipped with the pipe strap.

Furthermore, the base is provided with a pipe groove for accommodating the fixed pipe, two sides of the pipe groove are oppositely provided with a plurality of pipe clamping grooves, and the pipe clamp of the fixed pipe is fastened in the pipe clamping grooves.

Further, the bottom edge of the base is provided with a fixing piece for fixing the base on the object stage.

Furthermore, the fixing piece and the base are of an integrated structure, and the fixing piece is a cylinder with external threads.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses a CT system two ball calibration devices with adjustable has advantages such as simple structure, convenient to use and low cost. The distance of two balls is adjusted through two modes, one mode of realization is with first spheroid rigidity, puts into arbitrary ball groove with the second spheroid, and the not ball groove of co-altitude is put into to the interval accessible of two balls obtains, and another mode of realization is with first spheroid rigidity, obtains the different intervals of two balls through the position of the relative excellent groove of adjustment excellent core, two kinds of modes of adjusting two ball distances above, reasonable in design, simple operation. One side of the fixed pipe body is carved with a scale, the distance between the two small calibration balls can be directly read through the scale, the accuracy is high, and manual measurement errors are not easy to generate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic front view of an adjustable dual-ball calibration device of a CT system according to a first embodiment of the present invention;

fig. 2 is a schematic side view of an adjustable dual-ball calibration device of a CT system according to a first embodiment of the present invention;

fig. 3 is a schematic front view of a base according to a first embodiment of the present invention;

fig. 4 is a schematic top view of a base according to a first embodiment of the present invention;

fig. 5 is a schematic structural view of a fixed pipe according to a second embodiment of the present invention;

fig. 6 is a schematic structural diagram of a rod core according to a second embodiment of the present invention.

The reference numbers in the figures denote: 1. the measuring device comprises a circular hole, 2 ball grooves, 3 first balls, 4 second balls, 5 fixing pipes, 6 pipe clamps, 7 rod grooves, 8 scaleplates, 9 rod cores, 10 bases, 11 pipe grooves, 12 pipe clamp grooves and 13 fixing pieces.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments.

Example one

As shown in fig. 1 and 2, the two-ball calibration device of the adjustable CT system of this embodiment includes a base 10, a fixed tube 5, a first ball 3 and a second ball 4, the fixed tube 5 is vertically installed on the base 10, a scale 8 is carved on one side of the fixed tube 5, the distance between the two balls can be accurately identified, tube clamps 6 are disposed on two sides of the lower end of the fixed tube 5, the first ball 3 is embedded in the lower part of the fixed tube 5, the position is fixed, the first ball 3 can be integrated with the fixed tube 5, the second ball 4 is disposed in the fixed tube 5, and is located above the first ball 3, and the position is adjustable.

Preferably, the first ball 3 and the second ball 4 are stainless steel balls with a diameter of 1 mm. The base 10 and the fixed tube 5 are made of organic glass, or other high-hardness and high-wear-resistance high-molecular materials which are easy to penetrate by X rays.

In this example, the shape of fixed pipe 5 is the cylinder, has seted up a plurality of round holes 1 in one side top-down of fixed pipe 5 body, and is preferred, and the quantity of round hole 1 is 10, and the diameter of round hole 1 slightly is greater than the diameter of second spheroid 4 to can pass through second spheroid 4 smoothly, and the end of round hole 1 links up has the semi-circular ball groove 2 that is used for holding second spheroid 4, and the diameter of ball groove 2 is the same with the diameter of second spheroid 4, and ball groove 2 is located first spheroid 3 directly over, guarantees that the centre of sphere of first spheroid 3 and second spheroid 4 is located same vertical line. The second sphere 4 can be placed in the ball groove 2 through the round hole 1, and the distance between the first sphere 3 and the second sphere 4 can be obtained by placing the second sphere 4 in the ball grooves 2 with different heights.

As shown in fig. 3 and 4, a pipe groove 11 for accommodating the fixed pipe 5 is formed in the base 10, the base 10 is preferably rectangular, in order to facilitate CT imaging, the radius of the track of the steel ball is adjusted according to the size of the field of vision, multiple sets of pipe clamping grooves 12 are formed in two sides of the pipe groove 11, preferably, 10 sets of pipe clamping grooves are adopted, the pipe clamp 6 of the fixed pipe 5 is fastened in any one set of pipe clamping grooves 12, so that the fixed pipe 5 is fixed on the base 10, the pipe clamp 6 and the pipe clamping grooves 12 are connected through tight fit, and the connection is firm and reliable.

The bottom edge of base 10 is provided with mounting 13 for on being fixed in CT system's objective table with base 10, mounting 13 and base 10 integrated into one piece, mounting 13 is the cylinder that has the external screw thread, makes things convenient for whole calibration device's dismouting and maintenance.

The method for calibrating the parameters of the CT system by using the adjustable CT system double-sphere calibration device of the embodiment comprises the following steps:

s101, fixing the adjustable double-ball calibration device of the CT system on an objective table through a fixing piece 13;

s102, rotating the objective table for a circle, and acquiring a projection image formed by the device on the flat panel detector in the rotating process;

s103, acquiring projection coordinates of the centers of two spheres in each frame of image;

and S104, estimating calibration parameters by using the projection coordinates of S103.

The utility model discloses not only make the distance between the double ball adjustable, application scope is wide, can read the distance of double ball through scale 8 moreover, has improved the reading precision of calibration bobble distance, avoids producing the error.

Example two

The embodiment is basically the same as the first embodiment, and the same parts are not described again, except that: as shown in fig. 5 and 6, a rod groove 7 is formed in the fixed pipe 5 above the first sphere 3, a rod core 9 is arranged in the rod groove 7 and connected with the rod groove 7 through threads, an internal thread is formed in the rod groove 7, an external thread is formed outside the rod core 9, a second sphere 4 is embedded in the lower portion of the rod core 9, the rod core 9 is rotated forwards or backwards, and the position of the rod core 9 relative to the rod groove 7 is adjusted to obtain different distances between two spheres.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Finally, it is to be noted that: the above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. The utility model provides a CT system two ball calibration devices with adjustable which characterized in that includes:

a base;

the first ball body is embedded in the lower part of the fixed pipe;

2. The adjustable dual-sphere calibration device for CT systems according to claim 1, wherein said first and second spheres are stainless steel spheres, and said base and said fixed tube are organic glass.

3. The adjustable dual-ball calibration device for CT system as claimed in claim 1, wherein a plurality of circular holes are formed on one side of the fixed tube body from top to bottom at equal intervals, the diameter of the circular hole is slightly larger than that of the second ball body, the end of the circular hole is connected with a semicircular ball groove for accommodating the second ball body, the diameter of the ball groove is the same as that of the second ball body, and the ball groove is located right above the first ball body.

4. The adjustable dual-sphere calibration device for CT system according to claim 1, wherein a rod groove is formed inside the fixed tube above the first sphere, a rod core is movably disposed inside the rod groove and engaged with the rod groove, and the second sphere is embedded in the lower portion of the rod core.

5. The adjustable CT system dual-sphere calibration device according to claim 3 or 4, wherein the sphere centers of the first sphere and the second sphere are located on the same vertical line.

6. The adjustable CT system double-ball scaling device as recited in claim 4, wherein the rod groove is connected with the rod core through a screw thread, the rod groove is internally provided with an internal screw thread, and the rod core is externally provided with an external screw thread.

7. The adjustable dual-ball calibration device for CT system according to claim 1, wherein a tube clip is disposed on both sides of the lower end of the fixed tube body.

8. The adjustable dual-ball calibration device for CT system as claimed in claim 7, wherein said base defines a tube slot for receiving a fixed tube, wherein a plurality of tube slots are defined on two sides of said tube slot, and wherein said tube clip of said fixed tube is fastened in said tube slots.

9. The adjustable dual-sphere targeting device for CT systems according to claim 1, wherein the bottom edge of said base is provided with a fixing member for fixing the base to the stage.

10. The adjustable dual-sphere targeting device for CT systems according to claim 9, wherein the fixing member is integrally formed with the base, and the fixing member is a cylinder with external threads.