JPH09304303A - Portable x-ray ct device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time required to perform non-destructive examination on an immovable subject for examination using computerized tomography. SOLUTION: A portable X-ray CT(computerized tomography) device includes an annular rotor 1 designed, so that it can be partially removed and mounted, and mounts and dismounts both an image sensing device 4 and an X-ray generator 3 providing fluoroscopic images and also includes a rotor bearing device 9, a frame 11, and a lift 12, which can vary the inclination of the rotor 1 and achieve movement of the rotor 1 in the vertical direction, and an image processing device 8 which displays in real time a fluoroscopic image of a subject 2 for examination, by means of signals output from the image-sensing device 4 and which performs image reconfiguration process, based on image data in the circumferential direction of a predetermined cross section, contained in fluoroscopic data, to originate and display a tomogram of the perdetermined cross section. The subject 2 for examination is positioned within the annular rotor 1, and as the rotor 1 is rotated around the subject 2 for examination, a fluoroscopic image is taken, and the tomogram is obtained based on the fluoroscopic image obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nondestructive inspection technique for equipment such as pipes and valves installed in plants such as nuclear power and thermal power plants.

[0002]

2. Description of the Related Art Conventionally, in a nuclear power plant, X-ray radiography has been used for inspecting the integrity of welds in pipes and the inside of pipes. In this method, even if an automatic processor is used,
It takes 5 to 10 minutes for one X-ray photography. For example, in one place of pipe welding, X-ray photography is performed 3 to 5 times around the pipe (because the size of the film is limited) by changing the position. Including the work such as changing the positions of the X-ray generator and the film, it takes more than one hour for each pipe weld. Further, it is unclear whether or not the image capturing could be normally performed until the development is completed, and if the image capturing is unsuccessful, it is necessary to re-image the image, which requires much time.

On the other hand, as an example of a conventional portable X-ray CT apparatus, there is JP-A-60-214247 (robot CT). In this known example, the radiation generator main body horizontally moves around the object to be inspected while irradiating the object to be inspected with radiation. On the other hand, the radiation detection system detects radiation transmission data from the inspection object by a two-dimensional radiation sensor while horizontally rotating around the inspection object in the same direction and at the same speed as the radiation generation system. This detection data is sent to the central operation system together with the radiation generation system and the position data of the detection system, and a tomographic image of the object to be inspected is created by these data.

[0004]

The above-mentioned prior art is characterized in that a horizontal tomographic image of the inspection object can be created regardless of the installation mode, but a tomographic image of a vertical cross section of the inspection object is created. No consideration is given to what to do. Certainly, if the inspection object is rotated 90 degrees to create a tomographic image of the inspection object, a vertical tomographic image in the initial state of the inspection object (the state before the inspection object is rotated 90 degrees) is created. can do. However, the consideration for obtaining a tomographic image of an inspected object that cannot be moved like horizontal and vertical piping of a nuclear power plant is not sufficient. If the internal condition of the inspection object is unknown, it may be necessary to perform horizontal rotation scanning for the entire length or spiral scanning in the height direction with respect to the height (vertical) direction of the inspection object. -The processing amount increases, and the processing time increases.

It is an object of the present invention to evaluate the internal soundness of an object that cannot be moved, such as an installed plant pipe, in a short time.

[0006]

SUMMARY OF THE INVENTION The above-mentioned problem is that a tomographic image of an object to be inspected is obtained from a transmission X-ray image obtained by irradiating the object to be inspected with X-rays using a computer tomography (CT) technique. It is possible to mount, remove, and align both the X-ray generator and the transmission X-ray imaging device of the CT device of the reconfiguring type, and the rotating part can be partially removed and attached to the inspected object. A rotating body that makes one revolution around the rotating body, a rotating body bearing device that supports the rotating body and changes the inclination of the rotating body with respect to the horizontal direction, and enables movement of the rotating body bearing device in the vertical and horizontal directions. An elevating device with wheels and a perspective image from the imaging device are recorded in an image memory, and image reconstruction processing is performed on the data of a predetermined cross section among the data of the image memory,
And an image processing device for creating a tomographic image,
This is achieved by a portable X-ray CT apparatus characterized by obtaining a fluoroscopic image from an arbitrary angle along the rotation direction of the rotating body and a tomographic image of the object to be inspected on the rotating cross section of the rotating body.

The above problem is also solved by computer tomography (C) from a transmission X-ray image obtained by irradiating an object to be inspected with X-rays.
A CT device of the type that reconstructs a tomographic image of an object to be inspected using the method of T), a rail that forms a circular orbit around the object to be inspected, and can be installed separately on the object to be inspected, and an X-ray. It is possible to mount and remove a generator, and to mount and remove a rotating body A that rotates around the object to be inspected along the rail and a transmission X-ray image pickup device, and follow the rail. A rotating body B that rotates around the object to be inspected, a controller that controls the movement of the rotating body A and the rotating body B in conjunction with each other with the object to be inspected sandwiched therebetween, and the transmitted X-ray. An image processing device that creates a tomographic image by recording a perspective image from the image capturing device in an image memory and performing image reconstruction processing on data of a predetermined cross section among the data of the image memory. Comprising and including the rotating body A,
It is also achieved by a portable X-ray CT apparatus characterized by obtaining a fluoroscopic image from an arbitrary angle along the rotation direction of B and a tomographic image of the object to be inspected on the rotation planes of the rotating bodies A and B.

The above-mentioned problem is further solved by receiving an X-ray generator for generating X-rays and radiating the X-rays inside the inspection object, and an X-ray radiated from the X-ray generator and transmitted through the inspection object as image data. An image pickup device for outputting, a rotating means for rotating the periphery of the object to be inspected while the X-ray generator and the image pickup device are opposed to each other with the object to be inspected interposed therebetween, and the image pickup device is connected via a cable. An X-ray CT apparatus configured to include an image processing apparatus that generates and displays an X-ray fluoroscopic image using image data output by the image processing apparatus, and that generates and displays a tomographic image using the image data. Is an annular rotary body that can be disassembled into at least two parts each forming a part of an arc, a rotary body support means for slidably supporting the annular rotary body, and a fixed to the rotary body support means. Rotating the rotating body Rotating body driving means, a pair of supporting shafts arranged in a straight line on the outer peripheral side of the rotating body supporting means facing each other across the annular rotating body, and the pair of supporting shafts, respectively. And a pair of mounts for supporting the rotating body supporting means via
The line generator and the image pickup device are connected to each other by approximately 1 of the annular rotating body.
This is also achieved by a portable X-ray CT apparatus that is fixed at a position separated by 80 degrees and rotates with the rotating body, and that the rotating body can be divided while being supported by the rotating body supporting means. .

A gear is formed on the outer periphery of the annular rotary body, and the rotary body driving means includes a rotary body drive gear meshing with the gear and a rotary body drive motor for driving the rotary body drive gear. It is desirable that it be done.

It is desirable that one of the pair of mounts be provided with a rotating body supporting means rotating means for rotating the rotating body supporting means via the supporting shaft with the supporting shaft as a rotating shaft.

Further, it is desirable that the height of the pair of mounts can be changed independently.

Further, in order to achieve the above object, the present invention is arranged such that the X-ray generator and the X-ray detector are opposed to each other with the object to be inspected sandwiched therebetween, with the object to be inspected as the center. An X-ray CT apparatus that makes one revolution around an object to be inspected, is equipped with an image intensifier that fluoresces in real time as an X-ray detector, and an imaging device and an X-ray generator configured by the X-ray detector and a television camera. It is equipped with a rotating body that can be installed and removed, and can be partially removed and installed.
It is provided with means capable of changing the inclination of the rotating body and moving in the vertical and horizontal directions, transferring, storing and displaying the fluoroscopic image from the imaging device, and the circumferential direction of a predetermined cross section among the stored fluoroscopic image data. The image processing apparatus is configured to perform a reconstruction process based on the image data of 1) to create a tomographic image of a predetermined cross section.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable X-ray CT apparatus which is an embodiment of the present invention will be described below with reference to FIGS. The portable X-ray CT apparatus shown in FIG. 1 can be attached to and detached from an annular rotating body 1 that makes one rotation around the tube that is the inspection object 2 with the center line of the tube as a rotation axis. An X-ray generator 3 and a transmission X-ray imaging device (hereinafter, referred to as an imaging device) 4 mounted on the rotating body 1 and a rotating body 1 slidably supporting the rotating body 1 via a bearing 30. The rotating body bearing device 9 functioning as a concentric arc-shaped rotating body supporting means and the outer peripheral surface of the rotating body bearing device 9 are fixed so as to protrude in the radial direction at positions 180 degrees with respect to the central axis of the arc. A pair of detachable support shafts 10a and 10b and a rotary body drive motor (hereinafter referred to as a motor) which is fixed to the rotary body bearing device 9 and rotationally drives the rotary body 1 through a rotary body drive gear (hereinafter referred to as a gear) 13. ) 14 and support shaft 10
a pair of pedestals 11a and 11 that respectively support a and 10b
b, beams 11c and 11d that connect the lower portions of the pedestals 11a and 11b, and are substantially parallel to the support shafts 10a and 10b, and the lower flanges of the pedestals 11a and 11b, which are respectively arranged below the pedestals 11a and 11b. Lifting device 1
2a, 12b, a support shaft gear 31 mounted on the support shaft 10a, and a support shaft drive motor 16 that is fixedly mounted on the mount 11a and rotationally drives the support shaft gear 31 via a support shaft drive gear 15. , And an image processing device 8 connected to the image pickup device 4 by a cable.
The motor 14, the support shaft drive motor 16, the X-ray generator 3, and the imaging device 4 are controlled by a controller (not shown).

The rotary body 1 is composed of two disassembleable parts (both of which are a rotary body 1a and a rotary body 1b which form part of the same circular arc). The X-ray generator 3 and the imaging device 4 are mounted on the inner peripheral side of the rotating body 1a forming the larger arc, at positions facing each other with the central axis of the arc interposed therebetween. X
The line generator 3 is arranged so as to radiate the generated X-ray toward the center side of the arc, and the imaging device 4 is arranged so as to take in the X-ray coming from the center side of the arc. The outer peripheral surface of the rotating body 1 is a gear meshing with the gear 13,
The rotating body 1 is driven by the motor 14 and rotates along the rotating body bearing device 9 with the central axis thereof as the rotation axis. Rotating body 1b
Is divided at a position where it can be removed and attached while the X-ray generator 3 and the imaging device 4 are mounted on the rotating body 1a.

The motor 14 and the gear 13 constitute a rotating body drive means, and the support shaft drive gear 15 and the support shaft drive motor 16 are provided.
Constitutes the rotating body supporting means rotating means. That is, the rotating body supporting means rotating means supports the rotating body bearing device 9 on the supporting shaft 10.
The rotation body driving means rotates the rotation body 1 around the central axis thereof by rotating the rotation bodies a and 10b as rotation axes.

In this embodiment, as the X-ray generator 3, a commercially available AC power source pulse applying type industrial portable X-ray generator is used. In this method, since a conical pulse X-ray is generated, there is an advantage that a high voltage DC power source is not required and the size can be reduced. The size of a commercially available industrial portable X-ray generator is, for example, about 320 mm in diameter and 7 in length.
00 mm, and the weight is 30 to 40 kg.

As shown in FIG. 2, the image pickup device 4 forms an X-ray detector 5, a mirror 28 that reflects the light incident from the X-ray detector 5, and the light reflected by the mirror 28 into parallel rays. It is configured to include a lens 29, a television camera 6 that takes in light that has passed through the lens 29, a television camera controller 7 that is connected to the television camera 6, and a housing 4a that houses them. As the X-ray detector 5, a commercially available image intensifier fluorescent multiplier tube that fluoresces in real time was used. When X-rays enter the fluorescent multiplier, a fluoroscopic image is formed on the output surface of the fluorescent multiplier. Now, for example, when a commercially available 7-inch image intensifier and a CCD type television camera are used, the size of the image pickup device 4 (X, Y, Z directions in FIG. 2) is about 400 mm × 400 mm.
× 400 mm, and the weight is about 25 to 35 kg.
The commercially available 16-inch image intensifier weighs about 50 kg.

Details of the rotors 1a and 1b and the rotor bearing device 9 shown in FIG. 1 are shown in FIGS. The rotating bodies 1a and b have a separable bolt tightening structure, and the rotating body 1b can be removed from the rotating body 1a by removing the bolts. When inspecting the inspection object 2 such as a fixed pipe in a long length, the rotating body 1b is removed to form the rotating body 1 in an annular shape with a part of the arc missing, and the inspection object 2 is changed into an annular lacking area. After being passed and positioned on the inner circumference of the rotating body 1, the portion of the rotating body 1b is attached to form the rotating body 1 having a complete arc.

Support pedestals 32a and 32b are provided at positions facing each other on the inner peripheral side of the rotary body 1a.
The X-ray generator 3 and the imaging device 4 are attached to the support frame 32b so as to face each other. Of these, the X-ray generator 3 is attached to the support base 32a of the rotating body by sliding its position. When the inspection object 2 is set between the X-ray generator 3 and the imaging device 4, assuming that the inspection object 2 has a size of 1 m (usually most pipe diameters are within 1 m), rotation The diameter of the body 1 is about 2 m with a margin.

The outer peripheral portions of the rotating bodies 1a and 1b are gears that mesh with the gear 13. As shown in FIGS. 3 and 4, the rotating bodies 1 a and 1 b are driven by the motor 14 via the gear 13 and further supported by the bearing 30 of the rotating body bearing device 9. As described above, the removable support shafts 10a and 10b are attached to the rotating body bearing device 9 so as to form a part of the same straight line. Of these, the support shaft 10
There is a support shaft gear 31 in a, and this support shaft gear 31 is
It is driven by a support shaft drive motor 16 via a support shaft drive gear 15. The support shafts 10a and 10b are respectively shown in FIG.
It is supported by both pedestals 11a and 11b. The lower parts of these mounts 11a, 11b are removable beams 11c,
11d, coupled to each other, and further lifting devices 12a, 12
It is connected to b with a flange. Lifting devices 12a, 12
Reference numeral b is a general-purpose hydraulic cylinder type device with wheels, which allows the gantry 11a and 11b to be easily moved up and down independently. That is, the rotating body bearing device 9 can change the inclination of the rotating body 1 with respect to the horizontal plane, and can be moved in the horizontal direction by the elevating devices 12a and 12b.
It can be moved vertically. By such an operation of the rotating body bearing device 9, the axis of the rotating body 1 including the X-ray generator 3 and the imaging device 4 can be aligned with the axis of the inspection object 2.

The configuration of the image processing device 8 is shown in FIG. The size (width, height, depth) of the image processing device 8 is 1000.
The size is about mm × 1000 mm × 700 mm and the weight is about 80 to 100 kg. The image processing device 8 includes an A / D converter 17 connected to the image pickup device 4, a bus 8A connected to the A / D converter 17, a CPU 18 and a perspective image display device 21 connected to the bus 8A, respectively. Image memory 1
9, an image processor 20, a tomographic image display device 22, a tomographic data memory 23, and an image reconstruction unit 24, and is mounted on a wheeled carriage. A CRT is used for the fluoroscopic image display device 21 and the tomographic image display device 22. The image processor 20 is a general-purpose device for performing image gradation processing, enlargement processing, black-and-white inversion processing, and the like. The imaging device 4 and the image processing device 8 are connected by a cable.

As described above, the portable X-ray CT apparatus of the present invention can be divided into the following apparatuses. The dividable part includes the X-ray generator 3, the imaging device 4, the rotating body 1b, the rotating body 1a, and the gear 1.
3. Rotor bearing device 9 with motor 14, support shaft 10a
A support 11a with a support shaft gear 31, a support 11b with a support shaft 10b, a beam 11c, a beam 11d, a lifting device 12a, a lifting device 12b, and an image processing device 8. These devices are of a size and weight that can be transported by truck.

The operation of this embodiment will be described below with reference to FIGS.
This will be described with reference to 8 and 9. As shown in FIG. 1, as a non-destructive inspection example of the inspection object 2, a case of inspecting the soundness of a welded portion of a horizontal pipe will be described as an example. The preparatory work procedure in this case is shown in FIG.

First, the portable X-ray CT apparatus according to the present invention is disassembled (101) and transported by a truck to the plant installation location (102), and then the lifting devices 12a and 12b and the gantry 1 are installed.
The rotors 1a and 11b, the support shafts 10a and 10b, the beam 11c, and the rotor bearing device 9 are assembled, and the X-ray generator 3 and the imaging device 4 are attached to the rotor 1a (103). Rotating body 1b and beam 11d
Then, with the lifting devices 12a and 12b lowered, the device is manually moved to the inspection object 2 to be inspected (10).
4) The lifting devices 12a and 12b are lifted so that the inspection object 2 is located at the center of the rotating bodies 1a and 1b, and the lifting devices 12a and 12b are stopped (105). Then, the rotating body 1b is attached to the rotating body 1a (106). In addition, beam 1
1d removed (103) and beam 11
The work of connecting the d and the gantry 11a, 11b is necessary in the case of the inspection of the welded portion of the vertical pipe (FIG. 10) described later.

In the above-mentioned preparation procedure, when the welded portion 25 of the inspection object 2 (pipe) is inspected by X-ray, as shown in FIG. 7, there are (a) direct shot and (b) oblique shot. The direct-ray imaging method of (a) is a method in which the center lines of the X-ray generator 3 and the imaging device 4 are aligned with the slice of the welded portion 25 around the inspection object 2 (pipe), and the oblique-angle imaging method of (b). Is the X-ray generator 3
The X-ray from is captured by obliquely penetrating the welded portion 25 of the inspection object 2 (pipe) in the vicinity of the imaging device 4. By moving and adjusting the gantry 11a, 11b and the elevating device 12a, 12b, it is possible to easily perform direct-shot photography or oblique-angle photography. The inspection preparation is completed in this state.

Procedures for producing fluoroscopic images and tomographic images after X-ray generation will be described with reference to FIGS. In the case of X-ray CT, fan-shaped X-rays are used, and a plurality of one-dimensional X-ray detectors 5 (phosphors) and optical diodes are installed in a line in the slice direction of the inspection object 2. In the case of this embodiment, the two-dimensional X-ray detector 5
(Phosphor) is used, and conical X-ray is used. As shown in FIG. 8, the data of the central portion of the perspective image is sampled every time the rotating body 1 rotates by a predetermined angle, and one round of this data is collected and the image reconstruction calculation is performed. A tomographic image can be obtained. The angle of the rotating bodies 1a, 1b (for example, the rotating stroke of the rotating body drive gear 13) is input, and the central portion of the image memory 19 of the perspective image is taken out at a predetermined angle to obtain a tomographic data memory. The process of transferring to 23 is easy.

FIG. 9 shows a procedure for generating X-rays and producing a fluoroscopic image and a tomographic image. After setting the X-ray generator 3 and the imaging device 4 to the initial state position, the X-ray generator 3 is operated to generate X-rays (201). The generated X-rays are incident on the inspection target portion of the inspection object 2. Here, the image processing start switch is pressed, and an image start signal is sent to the image processing device 8.
The image processing device 8 receives the image processing start signal, starts image processing, and inputs an angle (rotation angle) indicating the position of the rotating bodies 1a and 1b (202). The X-rays that have passed through the inspection object 2 enter the X-ray detector 5 of the imaging device 4 and form a perspective image on the output surface thereof. The X-ray transparent image formed on the output surface of the X-ray detector 5 is photographed by the television camera 6 through the lens 29 and the mirror 28, and is output from the image pickup device 4 as an analog electric signal.

Image data, which is an analog electric signal output from the image pickup device 4, is sent to an A / D converter 17 of the image processing device 8 and converted into digital signal image data by the A / D converter 17. It is transferred to the image memory 19, stored together with the angle, and further displayed in real time on the perspective image display device 21 (203). The CPU 18 controls the data handling in the image memory 19 and the data transfer to the perspective image display device 21. The processes from the X-ray detector 5 to the fluoroscopic image display device 21 are general-purpose and well-known. With such an operation, it is possible to obtain a perspective image from an arbitrary angle along the rotation direction of the rotating body 1.

When the input angle (change amount thereof) becomes a predetermined angle (for example, 2 degrees) (204) degrees, the image memory 1 is read.
The data of the central portion of the fluoroscopic image (the tomographic portion indicated by the thick line in the X-ray detector 5 in FIG. 8) is taken out of the image 9 and transferred to the tomographic image data memory 23 (205).

The rotating bodies 1a, 1b gradually rotate with respect to the object to be inspected 2, and the CPU displays the perspective image on the perspective image display device 21 in real time, and at a predetermined angle of the central portion of the image memory 19. The data is transferred to and stored in the tomographic image data memory 23. When one rotation of the rotating bodies 1a and 1b is completed (206), the data for one rotation stored in the tomographic image data memory 23 is taken out, and the image reconstructing unit 24 makes a rotation cross section of the rotating body. A tomographic image is created. The image reconstruction unit 24 uses, for example, a well-known filtered back projection method as an image reconstruction calculation method. The tomographic image obtained by the image reconstruction unit 24 is displayed on the tomographic image display device 22. The tomographic image of the tomographic image display device 22 shows a cross-sectional image in the central longitudinal direction of the perspective image screen displayed on the perspective image display device 21. This makes it easy to understand the positional relationship between the perspective image and the tomographic image.

When obtaining a tomographic image of a cross section of the object 2 to be inspected, depending on the method, it takes several tens of seconds for data acquisition and image reconstruction processing, for example. When inspecting the inspection object 2 that is long at right angles to the slice (slice) direction by the method of obtaining only the tomographic image, it is necessary to increase the number of slices (slices), which increases the inspection time.

For example, when a defect of the pipe welded portion 25 is found from the perspective image, the apparatus according to the present invention is used so that the defective position of the welded portion 25 is located at the central longitudinal position of the perspective image display device 21. By moving and obtaining the tomographic image at that position, the time is significantly shortened as compared with the method of obtaining only the tomographic image from the beginning.

In the above embodiment, an example of the horizontal pipe is shown as the inspection object 2, but the rotating bodies 1a and 1b, the rotating body bearing device 9, the mounts 11a and 11b, the beams 11c and 11d, according to the present invention, are used.
It is possible to horizontally move the lifting devices 12a and 12b in the longitudinal direction of the horizontal pipe. As a result, for example, if some parts such as measuring instruments are damaged in the pipe and flow as lost parts with the fluid in the pipe, or if foreign matter is mixed in the pipe, search for lost parts or foreign matter. Therefore, by using the device according to the present invention, it is possible to search for lost parts in a short time while monitoring the fluoroscopic image with the fluoroscopic image display device 21 in real time.

In the above embodiment, when there is another horizontal branch pipe or vertical branch pipe in the middle of the horizontal pipe to be inspected, the rotating body 1b is removed and the lifting devices 12a, 1 are installed.
2b is lowered, the horizontal pipe is brought outside (upper side) of the rotation locus of the rotating body 1a of the present device, and after horizontal movement of the present device,
The elevating devices 12a and 12b are raised, and the horizontal pipe to be inspected is put in the rotation locus of this device, and the rotating body 1b and the rotating body 1a.
Connect.

In addition, for example, when a support (pipe support device) is installed from the bottom of the horizontal pipe toward the floor or a branch pipe is installed toward the floor, the rotary body 1b is removed. , The rotor 1a is placed on the upper side, and the beams 11c and 11d are further removed from the mounts 11a and 11b, so that the rotor 1a, the rotor bearing device 9, and the mounts 11a and 11b lifting devices 12a and 12b according to the present invention are horizontally piped. It is possible to move horizontally in the longitudinal direction.

In the above embodiment, the case of the horizontal pipe as the inspection object 2 is described, but the case of the vertical pipe is as shown in FIG. In FIG. 10, with the rotor 1b and the beam 11d removed, the support shaft drive motor 16 is started to rotate the support shaft 10a of the rotor bearing device 9 via the support shaft drive gear 15 to rotate the rotor 1a. Make sure the surface of rotation is horizontal. In this state, the X-ray CT apparatus of this embodiment is moved to the vertical piping position, and the position of the apparatus is adjusted so that the vertical piping is located at the intermediate position between the X-ray generator 3 of the rotating body 1a and the imaging device 4. Next, the rotating body 1b is attached to the rotating body 1a, and the beam 11d is attached to the mounts 11a and 11b. The procedure for creating a fluoroscopic image and a tomographic image after X-ray generation is the same as that shown in FIG.

In the above embodiment, non-destructive inspection of horizontal pipes and vertical pipes is shown as an inspection example of the inspection object 2, but ascending pipes from horizontal to vertical, pipes having a slope, and equipment other than pipes, for example, The apparatus according to the present invention can be applied to nondestructive inspection of valves, containers, pumps, etc. That is, if the inspection object 2 has a length obtained by subtracting the radial lengths of the X-ray generator 3 and the imaging device 4 from the diameters of the rotating bodies 1a and 1b, the inspection object 2 that cannot be moved is However, as long as the apparatus according to the present invention can be moved to position the inspection object 2 between the X-ray generator 3 and the imaging device 4, a perspective image and a tomographic image of the inspection object 2 can be obtained. You can The inspection time can be shortened by observing a perspective image of the inspection object 2 from the 360 degree direction or a part thereof with the device according to the present invention, grasping the appearance of the inspection object 2, and narrowing down the portion where the tomographic image is desired to be taken. Can be shortened.

In the above-mentioned embodiment, the image intensifier is used as the X-ray detector 5 for producing the fluoroscopic image and the tomographic image, but the image intensifier is used for producing and displaying the fluoroscopic image, It is also possible to use a linear phosphor and a photodiode (for example, 100 channels) to create and display a tomographic image. In this case,
A linear phosphor and a photodiode are arranged next to the diintense. The means for amplifying the output of the photodiode and collecting and reconstructing the data to create a tomographic image are general-purpose.

Besides, it is also possible to use, for example, a light weight gamma ray source as the X-ray generator 3.

Another embodiment of the present invention is shown in FIGS.
It is shown in FIG. 11 and 12 utilize the function of an automatic welding machine that simultaneously welds two units on a pipe.

In FIG. 11, 35a and 35b are pipe mounts, 36a, 36b, 37a and 37b are half flanges, and 3 is a flange.
8a, 38b, 39a, 39b are semi-flat mounts. The pipe mounts 35a and 35b of FIG. 11 cut both ends of the pipe, and further cut the pipe vertically toward the longitudinal direction, and semicircular flanges 36a and 36 at both ends of the pipe, respectively.
b, 37a, and 37b are welded in total. Further, the pipe mounts 35a and 35b have a structure in which they are connected by bolts. These flanges 36a, 36
b, 37a, 37b and half-plate mounts 38a, b, 39a,
Each of b has a structure that can be bolted. The image processing device 8 is the same as that described in the above embodiment, and the description thereof is omitted here.

Before the inspection, the pipe stand 35a and the flange 3
6a, 37a and flat plate mounts 38a, 39a are integrated by bolting. Further, the pipe mount 35b, the flanges 36b and 37b, and the flat plate mounts 38b and 39b are integrated by bolting. The pair of pedestals are set around the inspection object 2 such as a pipe from different directions and bolted. Next, the divided rail 26 is attached to a mounting jig 27.
Is set on the pipe pedestal using to form a circular orbit around the pipe pedestal in the circumferential direction. Two traveling carriages (rotating body A and rotating body B) traveling along the rail 26 forming the circular orbit.
Is attached to the rail, and the X-ray generator 3 and the imaging device 4 are set on these two traveling carriages. A traveling carriage (rotating body A) with the X-ray generator 3 set and a traveling carriage (rotating body B) with the imaging device 4 facing each other 180 degrees with the pipe stand in between, and traveling in a state of facing each other (on the rail 26). X-rays are generated while rotating the outer peripheral surface of the pipe pedestal along it, the object 2 is photographed, a perspective image is created and displayed, and data for creating a tomographic image is collected and image reconstruction is performed. To do. In this case, the X-rays enter the inspected object 2 after passing through the pipe pedestal 35, and the X-rays transmitted through the inspected object 2 are again in the pipe pedestal 35.
Although it will enter the imaging device 4 after passing through, the X-ray imaging can be similarly performed when the rail 26 is directly installed on the inspection object 2.

A device for controlling the above-mentioned operation by making the X-ray generator 3 and the image pickup device 4 face each other can be easily achieved because the existing automatic welding machine controller can be used. As shown in FIG. 8, it is necessary that the fluoroscopic image of the inspection object 2 by the X-rays from the X-ray generator 3 be within the detection range of the X-ray detector 5 in the circumferential direction. When the X-ray detector 3 does not fall within the detection range of the X-ray detector 5 in the circumferential direction, the imaging device 4 including the X-ray detector 5 is moved in the circumferential direction while the X-ray generator 3 is stopped. After collecting the image data, the X-ray generator 5 is further moved, and the above operation is repeated.

FIG. 12 shows an embodiment in which the rail 26 is set directly on the inspection object 2 and the X-ray generator 3 and the image pickup device 4 are moved on the rail 26. The rail 26 is set along the circumferential direction (welding portion direction) of the surface of the pipe to be inspected 2. The X-ray generator 3 and the imaging device 4 are moved on the rail 26 in a state of facing each other by 180 degrees.

FIG. 13 shows one side of FIG. The two rails 26 and the support shaft 34 installed around the object to be inspected 2 each have a groove, and the gears 33 and 3 are provided on the grooves.
3a moves. On the other hand, the X-ray generator 3 and the imaging device 4 are respectively supported by the support shaft 3 via a gear 33 a that is in contact with the support shaft 34.
Move on the groove of 4. The locus of movement at this time is rail 2
Direction perpendicular to the circular orbit created by (6
Cross section). The positions of the X-ray generator 3 and the imaging device 4 are shown in FIG.
In the state of 3, the gear 33 in contact with the rail is rotated around the inspection object 2. In this case, as shown in FIG. 7, a direct shot of (a) is performed on the welded portion.

Next, as shown in FIG. 13, a gear 33 is in contact with the support shaft 34 while the X-ray generator 3 and the imaging device 4 are opposed to each other.
Through a, move in the direction of the solid arrow. This case corresponds to the case of (b) oblique angle photography of the welded portion shown in FIG. In this state, the X-ray generator 3 and the imaging device 4 are moved on the rail 26 to inspect the welded portion 25 on the entire circumference for defects.

The embodiment shown in FIGS. 11 and 12 can be realized by a known technique, and is a system which can be applied as long as FIGS. 11 and 12 are provided around the object 2 to be inspected.

[0048]

As described above, according to the present invention, X
Devices required for line-to-ray image and tomographic image creation can be easily disassembled, transported, and assembled, and the location of tomographic image creation can be narrowed down by real-time fluoroscopic image observation from any angle. This has the effect of shortening the nondestructive inspection time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a portable X-ray CT apparatus according to the present invention.

FIG. 2 is a configuration diagram showing an example of an imaging device used in FIG.

FIG. 3 is a diagram showing an example of a rotating body and a rotating body bearing device used in FIG.

FIG. 4 is a sectional view showing an example of a rotating body and a rotary bearing device used in FIG.

5 is a configuration diagram of an image processing apparatus used in FIG.

6 is a flowchart showing a preparatory work for using the portable X-ray CT apparatus in FIG.

FIG. 7 is a diagram showing a positional relationship between an X-ray generator and an imaging device when photographing a weld.

FIG. 8 is a diagram showing a positional relationship between an X-ray generator, an object to be inspected, and an X-ray detector.

FIG. 9 is a flowchart showing an image creating procedure after X-ray generation used in FIG.

FIG. 10 is a schematic configuration diagram showing an embodiment of a portable X-ray CT apparatus according to the present invention.

FIG. 11 is a schematic configuration diagram showing another embodiment of the portable X-ray CT apparatus according to the present invention.

FIG. 12 is a schematic configuration diagram showing still another embodiment of the portable X-ray CT apparatus according to the present invention.

13 is a conceptual diagram showing an example of operation of the embodiment shown in FIG.

[Explanation of symbols]

1a, b Rotating body 2 Object to be inspected 3 X-ray generator 4 Imaging device 4a Housing 5 X-ray detector 6 Television camera 7 Television camera controller 8 Image processing device 8a Bus 9 Rotating body driving device 10a, b Support shaft 11a , B Frame 11c, d Beam 12a, b Lifting device 13 Rotating body driving gear 14 Rotating body driving motor 15 Support shaft driving gear 16 Support shaft driving motor 17 A / D converter 18 CPU 19 Image memory 20 Image Diprocessor 21 Fluoroscopic image display device 22 Tomographic image display device 23 Tomographic image data
Memory 24 Image reconstructing part 25 Welding part 26 Rail 27 Mounting jig 28 Miller 29 Lens 30 Bearing 31 Support shaft gear 32a, b Support mount 33,33a Gear 34 Support shaft 35a, b Pipe mount 36a, b Half flange 37a, b Half flange 38a, Half flat plate 39a, b Half flat plate

Claims (7)

[Claims] 1. A transmission X obtained by irradiating an inspection object with X-rays.
In a CT device of a type that reconstructs a tomographic image of an object to be inspected from a line image using a method of computer tomography (CT),
Installation and removal of both X-ray generator and transmission X-ray imaging device
With a structure that allows for axis alignment, a part of the rotating part can be removed and attached, and a rotating body that makes one rotation around the object to be inspected and a rotation that supports the rotating body and changes the inclination of the rotating body with respect to the horizontal direction. Body bearing device, the vertical direction of the rotating body bearing device, a lifting device with wheels that enables movement in the horizontal direction, a perspective image from the imaging device is recorded in an image memory,
An image processing device that creates a tomographic image by performing image reconstruction processing of data of a predetermined cross section among the data of the image memory, and is arbitrary along the rotation direction of the rotating body. A portable X characterized in that it obtains a perspective image from an angle and a tomographic image of the object to be inspected on the rotating cross section of the rotating body.
Line CT device. 2. A transmission X obtained by irradiating an inspection object with an X-ray.
In a CT device of a type that reconstructs a tomographic image of an object to be inspected from a line image using a method of computer tomography (CT),
A circular track is formed around the object to be inspected, and a rail that can be installed separately on the object to be inspected and an X-ray generator can be mounted and removed, and the periphery of the object to be inspected along the rail. Rotating body A
A rotating body B which can be mounted and removed with a transmission X-ray image pickup device and rotates around the object to be inspected along the rail, and both the rotating body A and the rotating body B are objects to be inspected. A control device for interlocking movement control in a state of being opposed to each other with a transmission unit interposed therebetween and a perspective image from the transmission X-ray image pickup device are recorded in an image memory, and data of a predetermined cross section among the data of the image memory is recorded. An image processing apparatus that creates a tomographic image by performing image reconstruction processing on the rotor, and a perspective image from an arbitrary angle along the rotation direction of the rotating bodies A and B; and a rotating body A. ，
A portable X-ray CT apparatus, which obtains a tomographic image of an object to be inspected on a rotating surface of B. 3. An X-ray generator that generates X-rays and radiates the inside of an object to be inspected, and an imaging device that receives X-rays emitted from the X-ray generator and transmitted through the object to be inspected, and outputs the image data as image data. An image output from the image pickup device, which is connected to the image pickup device via a cable, and a rotating means for rotating the X-ray generator and the image pickup device so as to face each other while sandwiching the object to be inspected. An X-ray CT apparatus configured to include an image processing apparatus that generates and displays an X-ray fluoroscopic image using data, and that generates and displays a tomographic image using the image data. An annular rotary body that is disassembled into at least two parts that form a part of an arc, a rotary body support means that slidably supports the annular rotary body, and the rotary body that is fixed to the rotary body support means. Rotating body driving means for rotating and A pair of support shafts arranged so as to form a straight line on the outer peripheral side of the rotor support means facing each other with the annular rotor interposed therebetween, and the rotation via the pair of support shafts respectively. And a pair of mounts for supporting the body support means, wherein the X-ray generator and the imaging device are substantially 180 degrees apart from each other in the annular rotating body.
A portable X-ray CT apparatus, which is fixed at a position apart from each other and rotates together with the rotating body, and the rotating body can be divided while being supported by the rotating body supporting means. 4. A gear is formed on the outer circumference of the annular rotary body, and the rotary body driving means includes a rotary body drive gear meshing with the gear and a rotary body drive motor for driving the rotary body drive gear. The portable X-ray CT apparatus according to claim 3, characterized in that 5. A rotating body supporting means rotating means for rotating the rotating body supporting means around the supporting shaft via the supporting shaft is mounted on one of the pair of mounts. The portable X-ray CT apparatus according to claim 3 or 4. 6. The portable X according to claim 3, wherein the height of the pair of mounts can be changed independently of each other.
Line CT device. 7. An X-ray CT apparatus that makes one revolution around an object to be inspected with the object to be inspected as a center while the X-ray generator and the X-ray detector are arranged opposite to each other with the object to be inspected sandwiched therebetween. At
The X-ray detector is equipped with an image intensifier that fluoresces in real time, and the image pickup device and the X-ray generator configured by the X-ray detector and the TV camera can be installed and removed, and partly removed, A rotating body having a structure that can be attached is provided, and means for achieving tilt change and vertical / horizontal movement of the rotating body is provided, and image data showing a perspective image from the imaging device is transferred, stored, displayed, and stored. A portable X, which is provided with an image processing device for performing reconstruction processing based on image data in a circumferential direction of a predetermined cross section among the image data thus obtained, and creating a tomographic image of the predetermined cross section. X-ray CT equipment.