JPH0436016B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an X-ray diagnostic device that can set the X-ray irradiation field and the irradiation amount, and particularly relates to an The present invention relates to an X-ray diagnostic apparatus that can perform X-ray irradiation under an appropriate irradiation field and dose.

(Prior Art) As this type of X-ray diagnostic apparatus, there is one in which an X-ray irradiation system, an imaging system, and a bed system each tilt, or a pair of at least two systems tilts.
An example of such a system is an X-ray TV system equipped with a reclining bed. In this system, the patient is placed on a reclining bed, and the operator operates the console to display the X-ray fluoroscopic image on the TV monitor and to take X-ray photographs. .

Here, the operating procedure for taking an X-ray photograph while observing a fluoroscopic image will be described. First of all,
The basic configuration of the system will be explained with reference to FIG. That is, in Fig. 3, 1 is an X-ray tube that generates an X-ray beam, and 2 is an X-ray tube that sets an X-ray irradiation field.
A radiation movable aperture device, 3 is a filter that limits the amount of X-ray irradiation, 4 is a patient placed on an upright bed (not shown), and 5 is a device for detecting X-rays that have passed through the patient 4;
6 is an X-ray film for radiography, and 6 is an II (image intensifier) for detecting transmitted X-rays, that is, for fluoroscopy. 7 is an optical system that focuses the output light of I.I 6, and 8 is a TV that converts the optical image of optical system 7 into an electric image.
This TV camera 8 can display a perspective image on a monitor (not shown).

On the other hand, a console (not shown) is provided, and an operator (not shown) operates this console to control irradiation on and off of the X-ray tube 1 under desired X-ray conditions. , the filter 3, and the up/down bed.

According to the above configuration, X generated from the X-ray tube 1
The X-ray beam determines the X-ray irradiation field by blades 2a and 2b (2b is shown in FIG. 4) built into the X-ray movable aperture device 2, and displays it on the monitor as a fluoroscopic image after passing through I, I6, etc. You will be able to do this.

In this case, as shown in FIG. 4, the abdominal thickness due to the various body shapes of the subject 4 is thicker in the center and thinner in the periphery, so the amount of X-rays transmitted through the subject is smaller in the center and thinner in the periphery. There will be more. For this reason, when the brightness in the central part of a perspective image is set to the optimum level for observation, the peripheral part will be in a halation state (excessive brightness state). To prevent this, the operator controls the X-ray absorbing member 3a built into the filter 3 to be gradually inserted from the edge of the X-ray irradiation field while observing the fluoroscopic image to avoid halation in the peripheral area. After confirming that there is no halation using a fluoroscopic image, photographing is performed using the film 5.

As mentioned above, in this type of X-ray diagnosis,
It is necessary to set the radiation field and radiation dose to appropriate values according to the body part of the subject. Therefore, the X-ray movable aperture device 2 is operated in advance to set the planned X-ray irradiation field, and the patient's body parts are set by, for example, operating a lever for raising/lowering control with the right hand. It is necessary for one operator to perform three operations almost simultaneously, such as observing the fluoroscopic image, operating the motor switch of the X-ray absorbing member 3a with the left hand to prevent halation, and also performing the imaging operation. be.

As mentioned above, the operation is complicated, so the planned
Even though the radiation dose without halation has been set under the X-ray irradiation field, the part of the patient to be examined may not be the desired one, or the X-ray radiation field, the radiation dose, and the patient's part may not be set as desired, resulting in film photography. There was a problem in that the timing could be missed, resulting in an unsatisfactory X-ray image, making it impossible to perform an appropriate X-ray diagnosis.

(Problems to be Solved by the Invention) As described above, in the conventional technology, the operations for setting the X-ray irradiation field, the irradiation dose, and the part of the subject are complicated, resulting in unsatisfactory X-ray images. I ended up
There was a problem that proper X-ray diagnosis could not be performed.

Accordingly, the present invention provides an X-ray system that allows for simple operations for setting the X-ray irradiation field, irradiation dose, and patient's body part to obtain the desired X-ray image and perform appropriate X-ray diagnosis. The objective is to provide diagnostic equipment.

[Structure of the Invention] (Problems to be Solved by the Invention) The present invention has a structure in which the following measures are taken to solve the above-mentioned problems and achieve the object. That is, the present invention provides an X-ray diagnostic apparatus in which the irradiation field of X-rays generated from an X-ray tube is set by a movable plate-shaped aperture blade, and the irradiation amount is set by an X-ray absorbing member. A plurality of X-ray absorption plates each having a blade-shaped end so that the amount of X-ray absorption is large at the edge of the irradiation field, and decreases toward the center of the irradiation field with a predetermined decreasing characteristic. The present invention is characterized in that X-ray absorbing members stacked one on top of the other with a predetermined attachment difference are fixed to the movable plate-shaped aperture blade with a predetermined attachment difference.

(Function) According to such a configuration, it is possible to simultaneously set the irradiation amount with almost no halation for the X-ray irradiation field, so the operation for X-ray diagnosis is simplified, and the desired patient can be By setting the irradiation dose with almost no halation under the planned X-ray irradiation field for the body part, it is possible to take satisfactory X-ray images and perform appropriate X-ray diagnosis. , a plurality of X-rays whose edges are formed into a blade shape so that the amount of X-ray absorption is large at the edge of the irradiation field, and the amount of X-ray absorption decreases with a predetermined decreasing characteristic toward the center of the irradiation field. Since the absorbing plates are stacked one on top of the other with a predetermined mounting difference, it is possible to adjust the irradiation amount with high precision and obtain an appropriate diagnostic image without halation.

(Embodiment) An embodiment of the X-ray diagnostic apparatus according to the present invention will be described below with reference to FIG. 1, in which the same parts as in FIGS. 3 and 4 are denoted by the same reference numerals.

As shown in FIG. 1, in this embodiment, an aperture blade 2b and a blade-shaped aluminum plate 1 as an X-ray absorbing member are used.
0, a blade-shaped aluminum plate 10 is fixed to the aperture blade 2b with a mounting difference S using screws 9.

As a result, the amount of X-ray absorption is large at the end face of the X-ray irradiation field, and becomes smaller toward the center of the irradiation field.

In addition, in the present invention, the end portions are formed into a blade shape so that the amount of X-ray absorption is large at the end face of the irradiation field, and decreases as it approaches the center of the irradiation field with a predetermined decreasing characteristic. It is possible to use an X-ray absorbing member configured by stacking a plurality of X-ray absorbing plates with predetermined attachment differences. That is, as shown in FIG. 2a, this aluminum plate 10 is formed by installing two blade-shaped aluminum plates 10a and 10b with a setting difference L, as shown in FIG. 2b. In addition, the plate thickness distribution can be adjusted with higher precision.

In this case, by using three or more aluminum plates, even more precise adjustment is possible.

According to the above configuration, it is necessary to set the X-ray irradiation field and the irradiation amount to appropriate values according to the body part of the subject, and this operation can be performed as follows. For example, the patient's body parts are set by operating a lever for raising/lowering control with the right hand, and the planned X-ray irradiation field is set by operating the X-ray movable aperture device 2 in advance with the left hand, for example. In this case, the aperture blades 2b and
Since the blade-shaped aluminum plate 10 is configured to work in conjunction with the radiation absorbing member, the irradiation amount for preventing halation can be set at the same time as setting the X-ray irradiation field. Then, a direct photographing operation is performed on the X-ray film. As described above, one operator can perform two operations almost simultaneously.

As described above, since there are two systems of operation, it is possible to set the irradiation amount with almost no halation under the planned X-ray irradiation field, and also to set the desired part of the subject. Furthermore, since the X-ray irradiation field, irradiation amount, and subject's body part can be easily set, the timing for film photography will not be missed. Therefore, it is possible to obtain a satisfactory X-ray image and perform an appropriate X-ray diagnosis.

Note that the aluminum plate 10 which is an X-ray absorbing member
By adjusting the plate thickness distribution, the amount of X-ray absorption is large at the edge of the X-ray irradiation field, and as it goes toward the center of the irradiation field,
Although it is designed to have a small amount of linear absorption,
The ability to prevent halation may be lower than in the conventional case where the X-ray absorbing member is adjusted independently while observing a fluoroscopic image. However, in this embodiment, it is possible to set the planned irradiation field and approximately appropriate irradiation dose for the desired part of the patient, and to obtain an X-ray diagnostic image at an appropriate imaging timing. will allow for appropriate diagnosis.

The present invention is not limited to the above embodiments, but can be implemented with various modifications without departing from the gist of the present invention.

[Effects of the Invention] As described above, in the present invention, the irradiation field of X-rays generated from an X-ray tube is set by a movable plate-shaped aperture blade, and the irradiation amount is set by an X-ray absorbing member. In an X-ray diagnostic device, the end of the radiation field is formed into a blade shape so that the amount of X-ray absorption is large at the edge of the irradiation field, and the amount of X-ray absorption decreases with a predetermined decreasing characteristic toward the center of the irradiation field. The X-ray absorbing member is constructed by stacking a plurality of X-ray absorbing plates with a predetermined mounting difference, respectively, and is fixed to the movable plate-shaped aperture blade with a predetermined mounting difference. , it is possible to simultaneously set the irradiation dose for the X-ray irradiation field with almost no halation, which simplifies the operation for X-ray diagnosis, and allows the X-rays to be scheduled for the desired part of the patient. By setting the irradiation dose with almost no halation under the irradiation field, it is possible to take satisfactory X-ray images and perform appropriate X-ray diagnosis. This has the effect of allowing accurate diagnostic images to be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of an X-ray diagnostic apparatus according to the present invention, FIG. 2 is a configuration diagram showing the configuration of main parts of another embodiment of the invention, and FIGS. 3 and 4 1 is a diagram showing a conventional example. 1...X-ray tube, 2...X-ray movable aperture device, 5...
...X-ray film, 6...II, 7...Optical system, 8
...TV camera, 9...screw, 10...aluminum plate.

Claims (1)

[Claims] 1. The irradiation field of X-rays generated from an X-ray tube is set by a movable plate-shaped aperture blade, and the irradiation amount is
In an X-ray diagnostic device configured with a radiation-absorbing member, the amount of X-ray absorption is large at the edge of the irradiation field, and decreases toward the center of the irradiation field with a predetermined decreasing characteristic. , an X-ray absorbing member made by stacking a plurality of X-ray absorbing plates each having a blade-shaped end with a predetermined attachment difference, is attached to the movable plate-shaped aperture blade with a predetermined attachment difference. An X-ray diagnostic device characterized by being held and fixed.