JPH08266535A - X-ray system - Google Patents

Abstract

PURPOSE: To easily confirm which part of an examinee is located in an X-ray irradiation field even when an X-ray photographing room is bright or the examinee has an irregular part. CONSTITUTION: An image pickup medium 81 and an optical system are provided in the inside of the diaphragm container 21 of an X-ray diaphragm device 2 mounted on an X-ray tube device 1. The optical system consists of an optical lens 82 and reflecting mirrors 83, 84, and these optical systems are operated by setting a visual point on an X-ray tube focal point 13, and an image observing the examinee 9 from the opening part of a diaphragm blade 25 is image- formed on the image pickup face of the image pickup medium 81. A video signal outputted from the image pickup medium 81 is amplified by an amplifier 85, and inputted to a monitor TV 7, and the image of the examinee located at an X-ray irradiation field 100 is displayed on the display screen of a monitor TV 7. Therefore, since the examinee is displayed by image-picking up as if observing from the X-ray tube focal point with the monitor TV 7, the image is confirmed as the one easy to observe even when the X-ray photographing room is bright or the examinee has the irregular part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray device equipped with an X-ray diaphragm device for limiting the irradiation field when irradiating an object with X-rays. It is related to the technology to be able to confirm.

[0002]

2. Description of the Related Art Usually, an X-ray is provided with a cathode called a cathode facing an anode called a target provided in a vacuum container, and a high voltage is applied between the cathode and the target. Thermions are generated by causing them to collide with the target by the high voltage. Since the X-rays are radially generated from the thermoelectron collision part (this is called a focus) of the target, the vacuum container is provided with a radiation port for radiating only a part of the generated X-rays to the outside of the container. X-rays emitted from the emission port
It is irradiated to the outside through a movable collimator called an X-ray diaphragm device. The irradiation field can be changed according to the size of the subject. If the X-ray irradiation field is not set to an optimum size for the subject, unnecessary X-ray exposure will be given to the subject. For this reason, conventionally, an X-ray irradiation field setting confirmation means including a lamp and an optical system is provided in the X-ray diaphragm device. That is, as shown in FIG. 3, the X-ray tube storage container 11
The X-ray diaphragm device 2 is provided in the radiation opening forming portion 12 of the lamp 26, and the lamp 26 and the reflecting mirrors 27 and 28 are provided therein, and
This light is projected onto the subject 9 by the reflecting mirrors 27 and 28. In this case, the lamp 26 has a geometrical arrangement equivalent to that of the lamp 26 at the focal point 13 of the X-ray tube. Therefore, in the same way that the X-rays are narrowed down by the diaphragm blades 25a and 25b of the X-ray diaphragm device 2, the light from the lamp 26 is also condensed.
It is blocked by a and 25b, and the X-ray irradiation field and the light irradiation field coincide. From the above, the operator does not emit X-rays,
It was possible to confirm the X-ray irradiation field with light.

[0003]

The conventional X-ray field setting confirming means as described above has the following problems. (1) When the size of the lamp cannot be increased so much and the distance between the lamp and the subject becomes large, the illuminated irradiation field also becomes dark, making it difficult to distinguish it from the surroundings.
In some cases, it was necessary to turn off the lights in the room, which was inconvenient to handle. (2) If the subject is flat, it is easy to confirm the irradiation field by observing the irradiation field illuminated by light not obliquely from the front but from a slightly oblique direction.
If the subject has irregularities, it becomes very difficult to confirm the irradiation field.

The present invention has been made in view of the above, and X
It is an object of the present invention to provide an X-ray device that can visually and easily confirm a radiation field. Further, as another object of the present invention,
An object of the present invention is to provide an X-ray device that can easily confirm the X-ray irradiation field even when the subject has irregularities and can confirm the X-ray irradiation field when the subject is viewed from the front.

[0005]

In order to achieve the above object, the present invention provides an X-ray field confirming an X-ray irradiation field set by blocking X-rays emitted from an X-ray tube device with an X-ray shielding material.
In an X-ray apparatus equipped with an X-ray irradiation field setting confirmation means, the X-ray irradiation is provided between an X-ray diaphragm blade and an X-ray tube focal point, and an imaging medium provided near the X-ray diaphragm blade storage container. An optical system for forming an optical image of the subject in the field on the image pickup surface of the image pickup medium, and a display system for displaying an output signal of the image pickup medium as an image are provided.

[0006]

With the image pickup medium provided in the vicinity of the container of the X-ray diaphragm device and the optical system, only the part of the subject located in the X-ray irradiation field formed by the X-ray tube focus and diaphragm blades is imaged. To do. The captured image is displayed on the monitor TV.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an X-ray imaging apparatus suitable for implementing the present invention. In FIG. 2, 1 is an X-ray tube device, 2 is an X-ray diaphragm device attached to the X-ray emission port of the X-ray tube device 1, 3
Is a bed on which the subject is placed, 4 is a film cassette receiver for X-ray photography, 5 is an X-ray high-voltage device, 6 is an X-ray control console, and 7 is a monitor TV for displaying the X-ray irradiation field.

Next, the detailed structure of the X-ray irradiation field setting confirmation means of the present invention will be described with reference to FIG. In FIG. 1, an X-ray diaphragm device 2 is attached to a portion of an X-ray emission port 12 of an X-ray tube storage container 11. As is well known, the X-ray diaphragm device 2 is provided with a plurality of sets of diaphragm blades inside the diaphragm container 21 and formed into a predetermined shape by attaching an X-ray shielding material, for example, a lead plate to an iron plate or the like. 22 is one of them,
Attached to the X-ray emission port 12 of the X-ray tube storage container 11,
X-ray shielding material consisting of a lead plate with a square hole in the center, 2
Reference numeral 3 denotes an aperture blade formed by forming an X-ray shielding material, for example, a lead plate adhered into a predetermined shape.
The X-ray shielding member 23 and the X-ray shielding member 23 are provided to remove so-called out-of-focus X-rays radiated from a portion of the X-ray tube out of the focus 13. Two
Reference numerals 4 and 25 denote movable diaphragm blades, each of which is provided with four X-ray shielding plates that can be manually or electrically moved in a direction orthogonal to each other, and an X-ray is emitted from an opening formed in the central portion and not covered by the X-ray shielding plate. The subject can be irradiated with. The inside of the pyramid formed when the plane connecting the opening and the X-ray tube focal point 13 intersects the subject becomes the X-ray irradiation field 100. Usually, the final size of the X-ray irradiation field 100 is set by the diaphragm blade 25. Therefore, in the following description, when simply referred to as an X-ray diaphragm blade, this diaphragm blade 25 is referred to.

An imaging medium 81 is provided in the container of the diaphragm device 2. The imaging medium 81 is the X-ray irradiation field 1
CC which uses a CCD which is a semiconductor image pickup device for picking up an image of an object existing in 00 and outputting a video signal thereof.
Although an image pickup tube for a D camera or a TV camera can be used, it is considered that a CCD camera is preferable in view of installation in a narrow space of the diaphragm storage container 21.

An optical lens 82 is provided in front of the image pickup medium 81.
And reflecting mirrors 83 and 84. Optical lens 82
The reflecting mirrors 83 and 84 form an optical image of an object existing in the X-ray irradiation field 100 on the image pickup surface of the image pickup medium 81. The reflecting mirrors 83 and 84 horizontally invert the optical image of the subject twice as shown in the figure to input the input image to the optical lens 82 in an upright state in the left-right direction. Optical lens 82
As shown in the figure, the single lens outputs an inverted image in the direction in which the output image is orthogonal to the paper surface, and forms the image on the image pickup surface of the image pickup medium 81. Therefore, in the illustrated configuration, the image pickup medium 81 is installed upside down in the direction orthogonal to the paper surface.
If it is not desirable to install the inverted imaging medium 81, a plurality of optical lenses 82 may be combined to make the output image of the optical lens system an erect image.

An amplifier 85 for amplifying a video signal is connected to the output side of the image pickup medium 81, and a monitor TV 7 is connected to the output side of the amplifier 85. The monitor TV can be either a CRT type or a liquid crystal type. The monitor TV is preferably installed near the X-ray control console 6 which is separate from the X-ray imaging room when the diaphragm device is electrically operated, and inside the X-ray imaging room when the diaphragm device is manually operated. It may be provided at an appropriate place. In addition, the above-mentioned liquid crystal type monitor TV
Can be provided on the side of the storage container of the X-ray apparatus main body or the X-ray diaphragm device that is easily seen by the operator.

The operation method and apparatus operation of this embodiment will be described below. The operator lays the subject 9 on the bed 3 and positions the imaging region of the subject 9 at the position facing the X-ray tube device 1.
Next, the film cassette is loaded and the X-ray diaphragm device 2 is operated to adjust the X-ray according to the size of the film cassette.
Set the radiation field. Conventionally, the operator turns on the lamp here and checks whether or not the imaging region of the subject is correctly positioned with respect to the X-ray irradiation field by the light, and if not, moves the subject. In other cases, the squeezing device was operated again, and the film size was changed.

In this embodiment, when the X-ray irradiation field is installed, the image pickup medium 81 is turned on (inputting an ON signal),
An optical image of the subject 9 formed on the imaging surface via the reflecting mirrors 83 and 84 and the optical lens 82 is captured. The imaging medium 81 images only the subject region located in the X-ray irradiation field 100, outputs the video signal to the amplifier 85, and the video signal amplified by the amplifier 85 is output to the monitor TV 7 and displayed on the monitor TV 7. A subject site image 71 located in the X-ray irradiation field is displayed on the screen. The image 71 of the subject 9 displayed on the monitor TV 7 is the image itself when the subject is viewed through the aperture of the diaphragm blade 25 with the viewpoint at the X-ray tube focus 13. Therefore, unlike the conventional lamp system, the difficulty of the operator confirming the X-ray irradiation field through the subject is eliminated.

When the image 71 displayed on the monitor TV 7 is observed and the imaged region of the subject 9 is not within the X-ray irradiation field, that is, the monitor image, the operator repositions the subject 9, or The adjustment of the diaphragm device is redone and the film size is changed. After that, if the operator performs X-ray imaging, the imaging site of the subject 9 is imaged on the film.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment and can be modified within the scope of the invention. For example, the imaging medium 81 is not provided in the storage container 21 of the diaphragm device 2 and
It is also possible to provide the monitor outside one unit, and a plurality of monitor TVs are not limited to one, but may be plural as needed, for example, one in the vicinity of the X-ray control console 6 and one in the vicinity of the bed of the X-ray apparatus. It may be provided such as.

[0016]

As described above, according to the present invention, only the part of the subject located in the X-ray irradiation field formed by the X-ray tube focal point and the diaphragm blade is imaged by the imaging medium, and the image is transferred to the monitor TV. Unlike the conventional lamp system, is displayed so that confirmation is easy even in a bright room. Also monitor TV
The image displayed on the screen can be an image of the subject taken from the front direction, so unlike the conventional method in which the operator stands and observes the subject side, the subject is uneven. Also, the subject portion located in the X-ray irradiation field can be easily confirmed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an X-ray irradiation field setting confirmation means according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an X-ray imaging apparatus to which the present invention is applied.

FIG. 3 is a diagram showing an example of a conventional device.

[Explanation of symbols]

 1 X-ray tube device 2 X-ray diaphragm device 7 Monitor TV 13 X-ray tube focus 21 Diaphragm device container 25 Diaphragm blade 81 Imaging medium 82 Optical lens 83, 84 Reflector 85 Amplifier

Claims (1)

[Claims] 1. An X-ray confirming a set X-ray irradiation field by blocking X-rays emitted from an X-ray tube device with an X-ray shielding material.
In an X-ray apparatus equipped with an X-ray irradiation field setting confirmation means, an imaging medium provided in the vicinity of the X-ray diaphragm blade storage container is provided between the X-ray diaphragm blade and the X-ray tube focal point, and the X-ray irradiation is performed. An X-ray apparatus comprising: an optical system that forms an optical image of a subject in a field on an imaging surface of the imaging medium; and a display system that displays an output signal of the imaging medium as an image.