JPH06265485A - Radioscopic unit - Google Patents

Abstract

PURPOSE:To provide a radioscopic unit that is able to secure the radioscopic picture of a subject from each of plural different directions, with a single radiation detector and, what is more, it has promoted miniaturization and economization. CONSTITUTION:Each of radioactive rays is generated out of both first and second X-ray tubes 1 and 2 toward an unillustrated subject on a conveyor in two directions, and the radioactive ray transmitted through the subject generated each in these two directions is detected by a single transmitted radiation detector 4, and then the subject transmitted data of the detected radiation are collected at a data collecting part 7, feeding a central processing unit 8 with these collected data, and plural radioscopic picture of the subject are constituted in this central processing unit 8, whereby each radioscopic picture of the subject from two directions is displayed on both first and second displays 9 and 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiographic apparatus used for non-destructive inspection or security, for example, to irradiate a subject with radiation to obtain a fluoroscopic image of the subject. On the other hand, the present invention relates to a radioscopic apparatus capable of generating a plurality of radiations from different directions and obtaining fluoroscopic images of a subject from different directions.

[0002]

2. Description of the Related Art A conventional fluoroscopic apparatus irradiates a subject with radiation from one direction to obtain a fluoroscopic image of the subject. However, a fluoroscopic image of the subject from a plurality of different directions may be required depending on the type of the subject and the contents of the examination.

Conventionally, as a method for obtaining a fluoroscopic image of a subject from a plurality of different directions, as shown in FIG. 12, a subject 92 placed on a belt conveyor 91 of a conveying device is indicated by an arrow 93. When moving in the direction shown, the first flying spot X-ray beam generator 94 and the first scattered radiation detector 95 are provided on one side of the upstream side of the belt conveyor 91 and the other side of the belt conveyor 91 is provided. By providing the transmitted radiation detector 96 on one side and the second flying spot X-ray beam generator 97 and the second scattered radiation detector 98 on the other side further downstream of the belt conveyor 91, The second scattered radiation detectors 95 and 98 obtain scattered ray images from both sides of the subject 92.

[0004]

As described above, in the conventional radiographic apparatus, in order to obtain fluoroscopic images of the subject from a plurality of different directions, a plurality of radiation detectors corresponding to a plurality of directions. And a plurality of data collecting devices corresponding to a plurality of radiation detectors are required, resulting in a large device configuration and a high cost.

The present invention has been made in view of the above,
The purpose is to obtain a fluoroscopic image of the subject from a plurality of different directions with a single radiation detector,
An object of the present invention is to provide a radiographic apparatus that is compact and economical.

[0006]

In order to achieve the above object, a radiographic apparatus of the present invention is provided with a plurality of radiation generating means for generating radiation in a plurality of directions toward a subject, and the plurality of radiation generating means. Control means for controlling the plurality of radiation generation means so that the radiations respectively generated in the plurality of directions are sequentially generated one by one, and the radiation generation means generate the radiations in the plurality of directions respectively. A single radiation detecting means for detecting the radiation that has passed through the subject, a displacement means for relatively displacing the subject with respect to the radiation generating means and the radiation detecting means, and the radiation detecting means. The gist of the present invention is to have imaging means for collecting subject transmission data of radiation and obtaining a plurality of fluoroscopic images of the subject based on the collected data.

Further, the radiation detecting means of the present invention includes a plurality of radiation generating means for generating radiation in a plurality of directions toward a subject, and a plurality of radiation generating means for generating radiation in a plurality of directions. A plurality of beam scanning means for narrowing and scanning in a pencil beam shape, and controlling the plurality of beam scanning means so that the pencil beam-like radiations respectively generated from the plurality of beam scanning means are sequentially generated one by one in a time division manner. Control means, a single radiation detecting means for detecting scattered radiation from a subject of pencil beam-like radiation respectively generated from the plurality of beam scanning means, and the radiation generating means, the beam scanning means and the radiation detecting means. On the other hand, the displacement means for relatively displacing the subject and the scattered radiation data detected by the radiation detection means are collected. And summarized in that and an imaging means for obtaining a plurality of fluoroscopic images of the subject on the basis of the collected data.

Further, the radiographic apparatus of the present invention includes a plurality of radiation generating means for generating radiation in a plurality of directions toward the subject, and a plurality of radiation generated in a plurality of directions from the plurality of radiation generating means. A plurality of beam scanning means for narrowing and scanning in a pencil beam shape, and controlling the plurality of beam scanning means so that the pencil beam-like radiations respectively generated from the plurality of beam scanning means are sequentially generated one by one in a time division manner. Control means, a single radiation detecting means for detecting the radiation of the pencil beam-like radiation generated from each of the plurality of beam scanning means, which is transmitted through the subject, and the radiation generating means, the beam scanning means and the radiation detecting means. On the other hand, the displacement means for relatively displacing the subject and the transmitted radiation data detected by the radiation detection means are collected. And summarized in that and an imaging means for obtaining a plurality of fluoroscopic images of the subject on the basis of the collected data.

[0009]

In the radiographic apparatus of the present invention, radiation is generated in a plurality of directions toward the subject, and the radiation generated in the plurality of directions is transmitted through the subject by a single radiation detecting means. Detected, the object transmission data of the detected radiation is collected, and a plurality of fluoroscopic images of the object are obtained based on the collected data.

Further, in the radiation detecting means of the present invention, the radiation focused on the pencil beam in a plurality of directions is generated toward the subject, and the pencil beam-like radiation generated in each of the plurality of directions is examined. The scattered radiation from is detected by a single radiation detecting means, the detected scattered radiation data is collected, and a plurality of fluoroscopic images of the subject are obtained based on the collected data.

Further, in the radiographic apparatus of the present invention, the radiation focused on the pencil beam in a plurality of directions is generated toward the subject, and the pencil beam-like radiation generated in each of the plurality of directions is examined. The radiation that has passed through is detected by a single radiation detecting means, the detected transmitted radiation data is collected, and a plurality of fluoroscopic images of the subject are obtained based on the collected data.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the construction of a radiographic apparatus according to an embodiment of the present invention. The fluoroscopy apparatus shown in the figure is placed on the conveyor 5 and is moved from the subject (not shown) moving in the direction of the arrow 81 by the conveyor drive unit 6 in two positions, a lateral direction and a downward direction, respectively. Radiation that has a first X-ray tube 1 and a second X-ray tube 2 for irradiating a ray, and that is generated from these first and second X-ray tubes 1 and 2 and that has passed through a subject (not shown) An inverted L-shaped penetrating radiation (T) which is disposed so as to face the first and second X-ray tubes 1 and 2 with a conveyor 5 interposed therebetween.
R) detected by detector 4.

The first and second X-ray tubes 1 and 2 are controlled by a controller 3 so as to alternately generate X-rays. This is because, for example, when the first and second X-ray tubes 1 and 2 are normal pulse X-ray generation sources, X-rays are alternately generated by alternately supplying X-ray generation pulses. In the case of a continuous-radiation X-ray source, a shutter or a chopper made of an opaque material that blocks X-rays may be used, and the X-rays may be alternately generated. You can

The transmitted radiation detector 4 detects X-ray transmission data in synchronization with the timing of X-ray emission of the first and second X-ray tubes 1 and 2, and the detected X-ray transmission data is collected. Collected by Department (DAS) 7. FIG. 2 shows the timing of the detection of X-rays by the transmitted radiation detector 4 synchronized with the X-ray radiation by the first and second X-ray tubes 1 and 2 and the data collection by the data collection unit 7.
As shown in the figure, the transmitted radiation detector 4 and the data acquisition unit 7 continuously detect X-rays in synchronization with X-ray emission alternately performed by the first and second X-ray tubes 1 and 2. Collecting data respectively.

The X-ray transmission data collected by the data collection unit 7 is A / D converted and supplied to the CPU 8. CP
The U8 temporarily stores the X-ray transmission data in the memory M ₁ as shown in FIG. 3, and then stores the first and second X-ray data.
The transmission data for the X-rays from the X-ray tubes 1 and 2 are separately divided into even and odd locations in the memory, and the transmission data for the X-rays from the first X-ray tube 1 is stored in the memory M ₂ . The transmission data for the X-rays from the other second X-ray tube 2 is stored in another memory M ₃ . Then, reconstruction processing is separately performed on each piece of X-ray transmission data stored separately in this way to form a fluoroscopic image of the subject from the direction of the first X-ray tube 1 to form a first image. It is displayed on the display 9, and a fluoroscopic image of the subject from the direction of the second X-ray tube 2 is constructed and displayed on the second display 10.

In FIG. 4, the X-ray transmission data collected by the data collection unit 7 is divided by the CPU 8 for each of the odd line data and the even line data in one memory M ₄ , and the first X transmission data is stored in location M ₄ of the memory M ₄ (E) about the line pipe 1, the second X
Transmitting data relating to the line pipe 2 is obtained so as to store the location M ₄ of the memory M ₄ (O). The other processes are the same as the processes described above.

As described above, in this embodiment, the first and second X-ray tubes 1 and 1 are made to operate by the single transmitted radiation detector 4.
X-ray transmission data from 2 directions of 2 is detected and
A perspective image of the direction can be obtained. In particular, the transmitted radiation detector 4 can be provided by only one unit, and the processing unit after the detector can be also provided by the device of one system only. Therefore, the configuration of the device can be simplified and the cost can be reduced. . In this embodiment, two displays are provided, but it is also possible to switch and use one display. Further, in this embodiment, two first and second X-ray tubes 1 and 2 are provided, but the number of time divisions is not limited to two, and three or more may be provided. And the memory for image formation can be increased by increasing the number of X-ray tubes.

In the embodiment shown in FIG. 1, a scattered radiation (BS) detector 100 is provided so as to face the transmitted radiation detector 4 as indicated by a dotted line, and the scattered radiation detector 100 is provided with the scattered radiation detector 100. It is also possible to detect the scattered radiation from the subject with respect to the X-rays of the first and second X-ray tubes 1 and 2 by providing the data acquisition unit 71 and the third display 11.

In this case, the first and second X-ray tubes 1 and 2 need to be flying spot (FSG) X-ray beam generators. As shown in FIG. 5, the flying spot X-ray beam generator is provided with a rotary collimator 82 having slits 82a around the X-ray tubes 1 and 2, and the rotary collimator and scattered radiation detector 100 are provided.
A linear collimator 83 having a slit 83a in the vertical direction between and is provided, and by rotating the rotating collimator 82, the flying spot X-ray beam 84, that is, the pencil beam, moves in synchronization with this rotation. Then, when the flying spot X-ray beam moves from one end of the linear collimator 83 to the other, data acquisition for one line corresponding to the operation of one of the first and second X-ray tubes 1 and 2 is performed. During this time, the rotary collimator may be controlled so that the opening of the rotary collimator 82 of the other X-ray tube has a positional relationship that does not cover the slit of the linear collimator 83.

FIG. 6 is a perspective view showing the construction of a radiographic apparatus according to another embodiment of the present invention. In the radioscopy apparatus shown in the figure, the positions of the transmitted radiation detector 4 and the scattered radiation detector 100 are changed in the embodiment shown in FIG. 1, and the position of the second X-ray tube 2 is changed accordingly. The difference is that the lower side is changed to the upper side, and other configurations and operations are the same as those of the embodiment of FIG.

Further, in more detail, in FIG. 6, the transmitted radiation detector 4 has one horizontal leg portion provided parallel to the lower side of the conveyor 5 and the other leg portion having the apex at the first position. It is arranged so as to match the height of the X-ray tube 1. The second X-ray tube 2 emits X-rays downward, and its focal point is arranged right above the tip of the horizontal leg of the first X-ray tube 1. With this configuration, the conveyor level can be lowered.

FIG. 7 is a view showing the arrangement of a radioscopic apparatus according to another embodiment of the present invention. The radiographic apparatus shown in the figure is provided with an L-shaped scattered radiation detector 22 facing the transmitted radiation detector 21.
A subject (not shown) is provided between the two. A first X-ray tube 24 is provided via a first flying-spot X-ray generation unit 23 near one of the legs of the L-shaped scattered radiation detector 22 extending in the vertical direction, and the other of the other. The second part is near the side of the leg that extends horizontally.
A second X-ray tube 26 is provided via the flying spot X-ray generation unit 25 of FIG. The X-rays generated from the first X-ray tube 24 are focused into a flying spot X-ray beam by the first flying spot X-ray creating unit 23,
The transmitted radiation detector 21 is transmitted through an object (not shown), and the scattered radiation from the object is detected by the scattered radiation detector 22. Further, the X-rays generated from the second X-ray tube 26 are focused into a flying spot X-ray beam by the second flying spot X-ray creating unit 25, transmitted through a subject (not shown), and detected by the transmitted radiation detector 21. At the same time, the scattered radiation from the subject is detected by the scattered radiation detector 22.

First X-ray tube 24 and second X-ray tube 26
Are respectively controlled by the first X-ray controller 27 and the second X-ray controller 28, and the first flying spot X
Line creation unit 23 and second flying spot X
The line creation unit 25 is controlled by the flying spot X-ray control unit 29, and alternately generates each flying spot X-ray beam in a time division manner. The first X-ray controller 27, the second X-ray controller 28 and the flying spot X-ray control unit 29 are controlled by the CPU 30. The scattered radiation detection data detected by the scattered radiation detector 22 is collected by the scattered radiation data collection unit 31 and supplied to the CPU 30, and the transmitted radiation detection data detected by the transmitted radiation detector 21 is the transmitted radiation data collection unit. It is collected at 32 and supplied to the CPU 30.

The CPU 30 is a scattered radiation data collection unit 3
1 and the transmitted radiation detection data supplied from the transmitted radiation data collection unit 32, respectively, are stored in the memory as described in FIGS. 3 and 4, and the transmitted radiation detection data is stored in the first X-ray tube 24. And the data corresponding to each X-ray from the direction of the second X-ray tube 26. Then, a fluoroscopic image of the subject is constructed from each of the classified transmitted radiation detection data and displayed on the first display 33 and the second display 34, and a fluoroscopic image of the subject corresponding to the scattered radiation detection data is formed. Is configured and displayed on the third display 35.

8 (a) and 8 (b) are a simplified perspective view and a plan view showing still another embodiment of the present invention, respectively.
As shown in the figure, in the present embodiment, the X-rays from the first and second X-ray tubes 1 and 2 are transmitted to the L-shaped transmitted radiation detector 4 in the embodiment shown in FIG. It is configured to emit light from different angles with respect to the traveling direction of a subject (not shown) that is placed on the top and moves.

FIG. 9 is a diagram showing a simplified construction of a radiographic apparatus according to still another embodiment of the present invention. The radiographic apparatus shown in the figure is provided with a plurality of, in this example, three X-ray tubes 41, 42, 43 facing the L-shaped transmitted radiation detector 4 provided above the conveyor 5. As a result, X-rays can be emitted from a plurality of different directions, and the X-ray tube 4 can be selected so as to select the three X-ray tubes 41, 42, 43.
X-ray controllers 44, 45, 46 corresponding to 1, 42, 43
And the timing controller 47 controls these X-ray controllers.

The timing controller 47 is a CPU 49.
The transmitted X-ray data detected by the transmitted radiation detector 4 is collected by the data collection unit (DAS) 7, and the CPU 49 forms a fluoroscopic image of the subject and is displayed on the display 50. ing.

The three X-ray tubes 41, 42 and 43 radiate X-rays in different directions, respectively, but by controlling the X-ray controllers 44, 45 and 46 and the timing controller 47. It is possible to perform switching control so that only one arbitrary direction is generated, two arbitrary directions are alternately generated in a time division manner, or three directions are alternately generated in a time division manner.

FIG. 10 is a timing chart showing the alternate switching operation. In the figure, when 11 to 14 select only one direction, 15 and 16 alternately control the X-ray tubes 42 and 43 by time division. 17 to 19 are X-ray tubes 41,
The case where 42 and 43 are alternately time-division controlled is shown.

FIG. 11A shows in more detail the alternate time division control of the X-ray tubes 42 and 43 shown by 15 and 16 in FIG. 10. As shown in FIG. Reference numeral 43 radiates X-rays by switching every line in a time division manner. Further, FIG. 11B shows in more detail the alternate time division control of the X-ray tubes 41, 42, 43 shown in 17 to 19 of FIG. 10, but similarly, the X-ray tubes 41, 42, 43 are also shown. Are sequentially switched for each line by time division.

In each of the above-mentioned embodiments, the transmitted radiation detector and the scattered radiation detector are shown as L-shaped ones, but the present invention is not limited to this. For example, a curved detector may be used as long as it can be covered.

[0033]

As described above, according to the present invention,
Generates radiation in multiple directions toward the subject,
A single radiation detecting means detects the radiations of the radiations generated in the plurality of directions, respectively, which have passed through the subject, collects the subject transmission data of the detected radiations, and collects a plurality of the radiations of the subject based on the collected data. Since the fluoroscopic image of the subject is obtained, the fluoroscopic images of the subject from a plurality of directions can be obtained by the single radiation detecting means, and the size and cost of the apparatus can be reduced and the examination of the subject can be performed. Etc. can be performed more accurately.

Further, according to the present invention, radiation focused in a pencil beam shape in a plurality of directions is generated toward the subject, and the pencil beam-like radiation generated in the plurality of directions is emitted from the subject. The scattered radiation is detected by a single radiation detecting means, the detected scattered radiation data is collected, and a plurality of fluoroscopic images of the subject are obtained based on this collected data. It is possible to obtain a fluoroscopic image of the subject from the direction of, and it is possible to reduce the size and cost of the device, and
It is possible to more accurately test the subject.

Further, according to the present invention, radiations focused in a pencil beam shape in a plurality of directions are generated toward the subject, and the pencil beam-like radiations generated in the plurality of directions are transmitted through the subject. The detected radiation is detected by a single radiation detecting means, the detected transmitted radiation data is collected, and a plurality of fluoroscopic images of the subject are obtained based on this collected data. It is possible to obtain a fluoroscopic image of the subject from the direction of, and it is possible to reduce the size and cost of the device, and
It is possible to more accurately test the subject.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a radioscopic apparatus according to an embodiment of the present invention.

FIG. 2 shows the first and second X in the embodiment shown in FIG.
7 shows the timing of X-ray detection and data acquisition synchronized with the X-ray emission by the X-ray tube.

FIG. 3 is an explanatory diagram showing a method of storing and dividing X-ray detection data collected by a data collecting unit in the embodiment shown in FIG.

FIG. 4 is an explanatory diagram showing a method of storing X-ray detection data collected by a data collecting unit in the embodiment shown in FIG.

5 is a perspective view showing a configuration of a flying spot X-ray beam generating means when a scattered radiation detector is used in the embodiment shown in FIG.

FIG. 6 is a perspective view showing a configuration of a radiographic apparatus according to another embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a radiographic apparatus according to another embodiment of the present invention.

FIG. 8 is a simplified perspective view and a plan view showing still another embodiment of the present invention.

FIG. 9 is a diagram showing a simplified configuration of a radiographic apparatus according to yet another embodiment of the present invention.

10 is a timing chart showing an alternate switching operation of a plurality of X-ray tubes in the embodiment of FIG.

11 is a timing chart showing a more detailed operation of the alternate switching operation of FIG.

FIG. 12 is an explanatory diagram showing a conventional method for obtaining a fluoroscopic image of a subject from a plurality of different directions.

[Explanation of symbols]

 1 1st X-ray tube 2 2nd X-ray tube 3 Controller 4 Transmitted radiation detector 5 Conveyor 7 Data collection part 8 CPU 100 Scattered radiation detector

Claims (5)

[Claims] 1. A plurality of radiation generation means for generating radiation in a plurality of directions toward a subject, and one radiation generated in each of a plurality of directions from the plurality of radiation generation means in sequence one by one in a time division manner. Control means for controlling the plurality of radiation generation means so as to generate, a single radiation detection means for detecting the radiation transmitted through the subject of the radiation generated in each of a plurality of directions from the plurality of radiation generation means, Displacement means for relatively displacing the subject with respect to the radiation generation means and the radiation detection means, and subject transmission data of radiation detected by the radiation detection means are collected, and based on the collected data, A fluoroscopic device, comprising: an imaging means for obtaining a plurality of fluoroscopic images. 2. A plurality of radiation generating means for generating radiation in a plurality of directions toward a subject, and radiations generated in a plurality of directions from the plurality of radiation generating means are narrowed down in a pencil beam and scanned. A plurality of beam scanning means; a control means for controlling the plurality of beam scanning means so that the pencil beam-like radiations respectively generated from the plurality of beam scanning means are sequentially generated one by one in a time division manner; A single radiation detecting means for detecting scattered radiation from a subject of pencil beam-like radiation respectively generated from the beam scanning means, and the radiation generating means,
Displacement means for relatively displacing the subject with respect to the beam scanning means and the radiation detection means, and scattered radiation data detected by the radiation detection means, and a plurality of fluoroscopic images of the subject based on the collected data And an imaging means for obtaining the image. 3. A plurality of radiation generation means for generating radiation in a plurality of directions toward a subject, and radiations generated in a plurality of directions from the plurality of radiation generation means are each narrowed down into a pencil beam for scanning. A plurality of beam scanning means; a control means for controlling the plurality of beam scanning means so that the pencil beam-like radiations respectively generated from the plurality of beam scanning means are sequentially generated one by one in a time division manner; A single radiation detecting means for detecting the radiation of the pencil beam-like radiation generated from the beam scanning means and transmitted through the subject; and the radiation generating means,
Displacement means for relatively displacing the subject with respect to the beam scanning means and the radiation detection means, and transmission radiation data detected by the radiation detection means, and a plurality of fluoroscopic images of the subject based on the collected data And an imaging means for obtaining the image. 4. The radiographic apparatus according to claim 1, wherein the transmitted radiation detecting means is L-shaped or inverted L-shaped. 5. Radiation for controlling a plurality of radiation generating means so that the radiation can be emitted only in any one direction or in a plurality of arbitrary directions among a plurality of radiation directions of the radiation generated from the plurality of radiation generating means. The radiographic apparatus according to claim 1, further comprising direction control means.