JP2003116845A - Medical x-ray equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide medical X-ray equipment capable of being positioned with respect to the region of interest of a subject without performing the irradiation with X-rays and capable of determining an X-ray irradiation range. SOLUTION: The medical X-ray equipment is equipped with an X-ray tube bulb 1, a X-ray iris 2 for controlling the irradiation range with X-rays emitted from the X-ray tube bulb 1, an X-ray detector (image intensifier 4) for detecting X-rays passed through the subject 3 through the X-ray diaphragm 2 to form an image, a monitor 18 for displaying the image due to the detection of X-rays and a camera 15 having the image pickup range substantially corresponding to the X-ray irradiation range. The image of the camera 15 is confirmed by the monitor 18 to perform the positioning to the region concerned of the subject and the determination of the X-ray irradiation range. Further, when the blood vessels of the lower limbs having many photographing points are photographed, the photographing region of the subject is discriminated on the basis of the difference of the brightness (or color) of the image of the camera to determine the X-ray irradiation range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical X-ray apparatus, and more particularly to a medical X-ray apparatus capable of positioning an object on a region of interest and deciding an X-ray irradiation range without irradiating the X-ray. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, as an X-ray apparatus for medical use, X-rays are radiated from an X-ray tube located above a patient (subject) placed on a table, and X-rays passing through the subject are X-rayed. It is known that a line detection unit detects and displays an X-ray image on a monitor based on this detection signal.

When using this type of device, it is necessary to position the subject in the region of interest and to determine the X-ray irradiation range. This positioning and irradiation range determination were mainly performed by two techniques.

[0004] One is a technique for performing positioning using the irradiation range of the lamp. FIG. 5 is a schematic configuration diagram of the movable diaphragm 2 located in front of the X-ray tube. This movable diaphragm 2
Is the pyramid restriction blades 20, 21 (upper blade) in order from the subject side,
The lower blades 22 and 23 and the out-of-focus X-ray reduction blades 24 and 25 (back blades) are provided, and by linking these, the utilization line cone is set to the minimum X-ray irradiation range necessary for diagnosis.

The X-ray irradiation range is confirmed by visual observation of the light irradiation range obtained by the projecting sight and by the opening display mechanism without irradiation of X-rays. That is, the light irradiation range obtained by the light flux passing through the light projection sighting device including the lamp 26, the mirrors 30 and 31, and the upper blades 20 and 21 is visually observed. The lighting of the lamp 26 is performed by a lighting switch 29. Together with upper blade 2
The X-ray irradiation range is confirmed by an opening degree display mechanism including a pointer 27 interlocking with 0 and 21 and a scale plate 28 representing the X-ray irradiation range. Therefore, the positioning of the subject in the region of interest and the determination of the X-ray irradiation range are limited to the vicinity where the light irradiation range and the opening display mechanism can be confirmed.

The other is to irradiate the patient directly with X-rays and
This is a technique for positioning by moving the X-ray tube or the table on which the patient is placed while checking the line detection image on the monitor.

Positioning of the subject in the region of interest and X
The determination of the irradiation range of the line is used not only when the subject placed on the table is photographed while being held at a fixed position, but also when the photographing region of the subject is varied. This is, for example, as in lower limb angiography, a subject is placed on a table, and a certain distance in the body axis direction of the subject for a certain time, that is, at a constant speed, several times (usually 4 to 5 times). It is a case where it is moved and taken at each stopped position under preset imaging conditions, and while collecting X-ray detection images, it is made to follow the flow of the contrast agent to form an image of the blood flow state of the lower limb blood vessels. . For that purpose, it is necessary to irradiate X-rays while moving the X-ray tube or the table on which the subject is placed.

Therefore, at the time of such photographing, it is necessary to preliminarily position the photographing region and determine the X-ray irradiation range. However, as the characteristic of the lower limbs, the lower limbs, thighs, knees, inflates, and ankles of the photographing region are Since the size is different, it is better to change the X-ray irradiation range according to these imaging regions.

Therefore, in the past, a subject was seen through before photographing.
By irradiating X-rays, positioning such as the start position and end position of imaging and the X-ray irradiation range were determined. That is, the position of the table on which the X-ray tube or the subject is placed is associated with the X-ray irradiation range by the fluoroscopy, and based on this, the X-ray tube or the table is moved to move the X-ray irradiation range to the X-ray irradiation range. Was to be irradiated.

In this case, right and left of the table,
After moving the table only one of the vertical movement axes and confirming that all the above-mentioned imaging parts are within the X-ray irradiation range, move the patient many times by looking at the waist, thighs, knees, inflation and ankles. Alternatively, the table is moved to perform positioning, and the patient's foot is fixed parallel to one of the operating axes of the table.

[0011]

However, the above-mentioned prior art has the following drawbacks. With lamp-based technology, one must go to the x-ray diaphragm and the patient's vicinity only to determine the irradiation position and range. Normally, an operating mechanism that has an X-ray irradiation switch and a table movement operation unit
It is away from the line diaphragm and table. To check the irradiation position and range, the light irradiation range and opening display mechanism can be visually checked.
You must move closer to the X-ray diaphragm, and back and forth between the operating mechanism and the X-ray diaphragm for positioning.
It is extremely complicated not to become. In addition, the light from the lamp is difficult to see unless the room is darkened.

On the other hand, in the technique of irradiating a subject with X-rays,
Positioning and determination of the X-ray irradiation range are performed by observing the X-rays that have passed through the subject as an image, and there is the disadvantage that the patient will receive invalid exposure before the irradiation position and range are determined. In particular, in the case of the lower limb blood vessel imaging, if it is attempted to increase the number of points to be imaged, the amount of fluoroscopic exposure increases due to the positioning of the increased points and the setting of the X-ray irradiation range.

During imaging of lower extremity blood vessels, the table is moved by one axis in advance before imaging, and the table is moved to confirm that all imaging sites are within the X-ray irradiation range. Since this is a method of positioning by moving the table several times while looking at the inflated and ankle, this positioning requires a lot of trouble. Therefore, the main object of the present invention is to position a subject in a region of interest without irradiating X-rays and to determine the X-ray irradiation range.
To provide a wire device.

Another object of the present invention is to position a subject in a region of interest even from a position distant from the subject, and
An object of the present invention is to provide a medical X-ray device capable of determining the irradiation range of rays. Furthermore, another object of the present invention is to
An object of the present invention is to provide a medical X-ray apparatus that can save the labor of positioning when imaging angiography of lower extremities.

[0015]

The present invention achieves the above-mentioned object by using a camera instead of a lamp, and confirming an imaged region and an X-ray irradiation range from the X-ray generation side by the image of the camera. That is, the medical X-ray apparatus according to the present invention is an X-ray tube, an X-ray diaphragm that controls the irradiation range of X-rays emitted from the X-ray tube, and an X-ray that passes through the subject through the X-ray diaphragm. And an X-ray detector for displaying the X-ray detection image, a monitor for displaying the X-ray detection image, and a camera having an imaging range substantially corresponding to the irradiation range of the X-rays.

When the image of the camera is displayed on the monitor by the X-ray apparatus having such a structure, the image shows an object in a range in which the X-ray is irradiated and the X-ray detection image can be captured. When the X-ray diaphragm is operated to determine the X-ray irradiation range, the blade of the X-ray diaphragm narrows the range in which the camera images the subject. The projected area of this image is
It becomes the same as the X-ray irradiation range, that is, the range of the X-ray image obtained by irradiation with X-rays. Therefore, it is possible to operate the position of the X-ray source while observing the monitor to position the region of interest of the subject, and operate the X-ray diaphragm to determine the X-ray irradiation range. Of course, useless X just for positioning
There is no need for radiation exposure.

The X-ray apparatus according to the present invention further comprises:
A movable table on which the subject is placed, a support mechanism that holds the X-ray tube, X-ray diaphragm, and X-ray detector and is movable with respect to the table, and operation of moving the table and support mechanism and X-ray irradiation. It is desirable to have an operation mechanism for performing. It is possible to position the X-ray irradiation on the subject by operating the operation mechanism while driving the table and the support mechanism while watching the image of the camera on the monitor.

Although the image of the camera can be displayed on a monitor different from the monitor for displaying the X-ray detection image,
Normally, it is displayed on the monitor for displaying the X-ray detection image. In that case, it is desirable to provide a switching means for displaying the X-ray image on the monitor during the X-ray irradiation and displaying the image of the camera on the monitor when the X-ray is not irradiated. The display of the monitor may be switched by the X-ray irradiation signal.

The camera is installed at a position where an imaging range substantially corresponding to the X-ray irradiation range can be obtained. For example,
It is desirable that a mirror be provided in the utilization line cone in the X-ray diaphragm so that the image of the subject is taken out of the utilization line cone and captured by the camera.

A CCD camera generally used for a TV camera or the like is preferably used as the camera. Since the CCD camera is small, it is convenient to store it in an X-ray diaphragm having a limited storage space.

Further, when there are many photographing points as in the case of lower limb blood vessel photographing, there is provided means for deciding the X-ray irradiation range by recognizing the region of the subject by the difference in the brightness (or color) of the image of the camera. You may do it.

Further, the object part is identified by the difference in the brightness (or color) of the image of the camera, and the table, the X-ray tube support mechanism, or both of them are arranged on the left and right (X) and up and down (Y) of the object. It is equipped with a means for positioning the X-ray irradiation on the subject by moving it in the biaxial directions.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. (Overall Configuration of X-ray Apparatus) FIG. 1 shows a first X-ray apparatus according to the present invention.
It is a schematic block diagram of the Example of. This device includes an X-ray tube 1 which is an X-ray source, a movable X-ray diaphragm 2 which controls the irradiation range of X-rays emitted from the X-ray tube 1, and an object 3 which passes through the X-ray diaphragm 2 and a subject 3. And an image intensifier 4 (X-ray detector) that detects X-rays and forms an image. Usually X-ray tube 1 and X
The line stop 2 constitutes an X-ray generation unit and is attached to one end of a support mechanism 5 such as a C-arm, and the image intensifier 4 is attached to the other end of the C-arm.

X-ray tube 1 and image intensifier 4
A movable table 6 on which the subject 3 is placed is provided between and, and the region of interest of the subject 3 is positioned by rotating the C-arm and sliding the table 6.

All the operations of the X-ray apparatus are performed by the remote operation mechanism 7. Both remote and proximity are possible,
Remote is desirable to reduce operator exposure. The operating mechanism 7 includes a diaphragm operating device 8 that operates the X-ray diaphragm 2 and a supporting mechanism 5.
It is provided with a support mechanism operating device 9 for rotating and sliding the table, a table operating device 10 for sliding the table 6, an X-ray irradiation switch 11 for irradiating X-rays, and the like.

As described later, the X-ray diaphragm 2 has a TV camera 15
And an X-ray television camera 16 is attached to the secondary phosphor screen side of the image intensifier 4. The video signal of the TV camera 15 and the signal of the X-ray TV camera 16 are sent to the TV signal switch 17. TV signal switch 17
Is linked to the X-ray irradiation switch 10, and X
The signal of the line television camera 16 is sent to the monitor 18 to display the X-ray image, and when the X-ray is not emitted, the signal of the TV camera 15 is sent to the monitor 18 to display the TV camera image.

FIG. 2 is a schematic diagram showing the case of performing a lower limb angiography as a second embodiment of the X-ray apparatus according to the present invention. This second embodiment is the same as the first embodiment except that
The brightness (or color) of the image captured by the TV camera 15 is added to the means for determining the position of each part of the angiography of the lower limbs and the X-ray irradiation range. The brightness level detecting means 50 for detecting, the site identifying means 51 for identifying the imaging site based on the brightness level detected by the brightness level detecting means 50, and the X-ray irradiation range depending on the site identified by the site identifying means 51. X-ray irradiation range determining means 52 to determine, the site identified by the site identification means 51 and the X
A storage unit 53 for storing such information by associating the relationship with the X-ray irradiation range determined by the X-ray irradiation range determining unit 52, and a table based on the imaging region and the X-ray irradiation range stored in the storage unit 53. X and the amount of movement of the table
An operation signal generating means 54 for generating an operation signal for adjusting the diaphragm amount of the line diaphragm 2 is provided, and these operation signals are given to the table manipulator 10 and the X-ray diaphragm manipulator 8 to determine the imaging region of the subject. Positioning and setting of X-ray irradiation range are performed. The brightness level detection means 50, the part identification means 51, the X-ray irradiation range determination means 52, and the storage means 5 in this configuration.
3 and the operation signal generation means 54 are the central processing unit (CP
U), a storage device (memory), an input / output interface, and other well-known microcomputers.

(Detailed structure of movable X-ray diaphragm) In the apparatus of the present invention, the X-ray diaphragm 2 is provided with the TV camera 15, and the image capturing range of the TV camera 15 is made to correspond to the X-ray irradiation range. Monitors the determination of the irradiation range and the positioning of the subject in the region of interest
Check at 18 and do.

FIG. 3 is an internal configuration diagram of the X-ray diaphragm 2. This X
The line diaphragm 2 is obtained by replacing the lamp in the conventional X-ray diaphragm shown in FIG. 6 with a TV camera.

The X-ray diaphragm 2 includes line-pyramid limiting blades 20 and 21 (upper blade), lower blades 22 and 23, and out-of-focus X-ray reducing blades 24 and 25 (back blade) from the object side. The upper blades 20 and 21, which are mainly made of lead plate, are the most important blades that set the utilization line cone to the minimum X-ray irradiation range necessary for diagnosis.

The lower blades 22, 23 are interlocked with the upper blades 20, 21.
And the rear wings 24, 25 operate. The lower blades 22 and 23 greatly contribute to the reduction of scattered radiation and the leakage dose of the movable diaphragm. The back blades 24, 25 effectively reduce out-of-focus X-rays (X-rays generated in the vicinity thereof in addition to X-rays generated in a portion of the nominal focus size, which is common in rotating anode X-ray tubes).

Here, the TV camera 15 is provided in the X-ray diaphragm so as to have an imaging range substantially corresponding to the X-ray irradiation range. A first mirror 30 is installed between the upper blade 21 and the lower blade 22, a second mirror 31 is installed in a substantially horizontal direction of the first mirror 30, and a TV camera 15 is installed below the second mirror 31. To do. The first mirror 30 is provided so as to be inclined on the utilization line cone and reflects the light from the subject 3 toward the second mirror 31 outside the utilization line cone. The second mirror 31 uses the light from the first mirror 30 as a TV camera.
Reflect towards 15.

The first mirror 30 is arranged so that its outer periphery is in contact with the outer edge of the utilization line cone when the X-ray diaphragm 2 is fully opened, and forms a triangle ABC surrounded by the X-ray tube 1. Further, the first mirror 30 constitutes a trapezoid BCDE surrounded by the second mirror 31, and the second mirror 31 is surrounded by the TV camera 15 and is a triangle D.
Configure EF. And the area of the triangle ABC and the trapezoid BCDE
The TV camera 15 is arranged so that the total area of the triangle DEF and the triangle DEF are equal.

By disposing the TV camera 15 inside the movable diaphragm 2 for X-rays and further behind the upper blades 20 and 21 (X-ray tube side), the upper blades 20 and 21 are projected onto the TV camera 15. The image of the subject is blocked. As a result, the image of the subject displayed on the TV camera 15 can be an image equivalent to the X-ray irradiation range.

In addition, the X-ray diaphragm 2 includes a removable additional filter 35 for protecting the total filtration that defines the quality of X-rays, a lead mask or a compensating filter used depending on the region to be imaged and a special diagnostic purpose. It has a groove 36 that can be inserted.
In addition, guard 37, X to limit focal skin distance (SSD)
A ring 38 for adjusting the center of focus of the X-ray tube device and the center of the used line cone and rotating the movable X-ray diaphragm, a mounting ring 39 for mounting the movable X-ray diaphragm on the X-ray tube device, and a knob 40 for operating the upper blade, and A cross plate 41 is provided. Upper blade 2
0 and 21 can be directly operated by the upper blade operation knob 40 when the worker is close to the X-ray generation unit, and are remotely operated by the diaphragm operation unit 7 of the operation mechanism.

(Operation) The operation of the first embodiment of the present invention will be described with reference to FIG. In FIG. 1, a subject is placed on a table and the X-ray irradiation switch 11 is turned off. In that case, the image of the TV camera 15 is displayed on the monitor by the switch 17. The operator supports the mechanism while watching the image from the TV camera 15.
5 is driven and the table is driven to position the subject in the region of interest.

Further, to confirm the X-ray irradiation range,
While watching the monitor 18, the diaphragm operator is operated to open and close the X-ray diaphragm to determine the optimum X-ray irradiation range. TV camera 15
Since the image range of corresponds to the X-ray irradiation range as it is, the X-ray irradiation range can be easily determined.

Next, the X-ray apparatus according to the present invention shown in FIG.
The operation at the time of lower limb blood vessel imaging, which is the second embodiment, will be described. This second embodiment is the same as the first embodiment except that
The brightness (or color) of the image captured by the TV camera 15 is used to determine the position of each part of the lower limb angiography and the X-ray irradiation range. In Fig. 4, the position of the X-ray diaphragm blade during the lower limb angiography. A conceptual diagram of how to determine the (X-ray irradiation range) is shown. FIG. 4A shows an example of the relationship between each part of the lower limbs and the X-ray irradiation range. In this figure, the X-ray irradiation ranges at the imaging parts 61 to 65 are shown. In this case, in order to prevent image quality deterioration due to direct X-ray entry and to reduce radiation exposure, it is better to narrow the X-ray irradiation range by contacting the subject as much as possible with the X-ray diaphragm 2. The present invention changes the X-ray irradiation range according to the size of the imaging region of the lower limbs 61 to 65 shown in FIG. 4 (a), that is, the X-ray irradiation range is changed by the X-ray diaphragm 2. The focus is on the left and right of the table (direction perpendicular to the body axis of the subject).

FIG. 4 (b) is a TV of the parts 61 to 65 in FIG. 4 (a).
The luminance distribution of the image of the camera 15 is shown in the left-right direction of the table, and an enlarged view of this is shown in FIG. 4 (c).
The X-axis of FIG. 4 (c) is the brightness level B of the image of the TV camera 2,
The Y-axis is the aperture position L of the X-ray aperture 2, and the lines a and
The relationship between the brightness of the TV camera and the position of the X-ray diaphragm at line b and line c is shown.

Since the color of the table is usually white,
The brightness of the image captured by the TV camera is high, and the brightness of the subject is low compared to this. Using this, when the threshold value of the brightness of the image of the TV camera for discriminating the table and the subject is Bb, the brightness threshold value Bb at the line a, the line b, and the line c, which are the imaging parts, X-ray diaphragm position is L
It becomes 1, L2, L3. In this case, if the X-ray diaphragm 2 is too narrow, the subject will not be captured by the TV camera, so L1 having the widest X-ray irradiation range is selected.

In this way, the position L1 of the X-ray diaphragm is selected to determine the X-ray irradiation range, and at the same time, the position of the X-ray tube or the table on which the subject is placed is associated with the X-ray irradiation range. Is stored in the storage means 53.

The operation signal generating means is an operation signal for adjusting the moving amount of the table and the diaphragm amount of the X-ray diaphragm 2 for moving the table based on the imaged region and the X-ray irradiation range stored in the storage means 53. Generated in 54, these operation signals are given to the table operation device 10 and the X-ray aperture operation device 8 to position the imaging region of the subject and set the X-ray irradiation range.

In the above-described embodiment, the method of determining the X-ray irradiation range by dividing the imaged region into 61 to 65 as shown in FIG. 4 (a) has been described, but this is not divided like 61 to 65. It may be continuous. In this way, the threshold value Bb of the brightness of the image of the TV camera corresponding to the position of the table is
Points corresponding to the outline of the subject
The X-ray irradiation range can be set. Therefore, T at a time
It is possible to continuously determine the X-ray irradiation range corresponding to the position of the table by capturing images from the image capturing start position to the image capturing end position with the V camera.

FIG. 5 shows a conceptual diagram of how to determine the X-ray irradiation range at the time of imaging the blood vessels of the lower limbs when the body axis direction of the subject is not parallel to the table. FIG. 5 (a) shows an example of the relationship between each part of the lower limbs and the X-ray irradiation range. In this figure, the X-ray irradiation ranges at the imaging parts 71 to 75 are shown. In this case, in order to prevent the deterioration of image quality due to the direct entry of X-rays and to reduce the radiation exposure,
It is better to narrow the X-ray irradiation range by contacting the subject with the line diaphragm 2 as much as possible. The present invention changes the X-ray irradiation range according to the size of the imaging region of the lower limbs 71 to 75 shown in FIG. 5 (a), that is, the X-ray irradiation range is changed by the X-ray diaphragm 2. The focus is on the left and right of the table (direction perpendicular to the body axis of the subject).

FIG. 5 (b) shows the TV of the parts 71 to 75 in FIG. 5 (a).
6 shows the luminance distribution of the image of the camera 15 in the left-right direction of the table. The X-axis of this Fig. 5 (b) is the TV camera 2
The brightness level B and Y axis of the image of is the diaphragm position L of the X-ray diaphragm 2.
The relationship between the brightness of the TV camera and the position of the X-ray diaphragm at lines a, b, and c, which are the imaged parts, is shown.

Since the white table is used, the brightness is high and the brightness of the subject is low compared to this. Using this, when the threshold of the brightness of the image of the TV camera for discriminating the table and the subject is Bb, the brightness threshold Bb at the line a, the line b, and the line c, which are the imaging parts, The central points of the luminance levels are L4, L5, and L6, respectively, and the line connecting them is the line A. By moving the table in the left-right (Y) direction along the line A and aligning the table with the line A, the irradiation center of the X-ray can be matched with the center of the photographing unit of the subject.

By doing this, as long as the state position is determined, even if X-ray irradiation is suddenly started, the table is moved in the left-right direction and positioned so that the center of the imaged region of the subject is irradiated with X-rays. It becomes possible to make it the center.

In the above-described embodiment, the part of the object is identified by the difference in the brightness or color of the image of the camera, and the table is moved based on this identification signal to move the X-axis to the object.
Although the example of performing the positioning of the line irradiation has been described, this may be performed using the support mechanism or both the table and the support mechanism.

As described above, the positioning of the region of interest and the determination of the irradiation range by the X-ray apparatus of the present invention are both performed by X-ray.
This can be performed without irradiating the line, and unnecessary exposure of the subject can be prevented.

At the time of X-ray irradiation in which the X-ray irradiation switch 11 is turned on, the X-ray detection image of the X-ray camera is displayed on the monitor 18 by the switch. The field of view of the image intensifier 4 and the enlargement ratio (distance between the focus of the X-ray tube 1 and the subject 3, X
Depending on the ratio of the focus of the X-ray tube 1 and the distance of the image intensifier 4), the image of the TV camera 15 is enlarged and displayed in conjunction with the SID (distance between the X-ray tube 1 and the image intensifier 4). Needless to say, the image intensifier is used as the X-ray detector in the above embodiment, but this is also realized in a flat panel type detector composed of a scintillator and a photodetector. It is possible.

[0051]

As described above, according to the X-ray apparatus of the present invention, the image of the camera from the X-ray generating side is displayed on the monitor, so that the subject can be easily photographed even from a place far from the X-ray diaphragm. Can be positioned in the region of interest.

Further, by making the image pickup range of the camera substantially correspond to the X-ray irradiation range, the X-ray irradiation range can be easily determined by operating the X-ray diaphragm while watching the camera image on the monitor. You can

Since the position of the subject in the region of interest and the X-ray irradiation range can be determined using the camera without irradiating the subject with X-rays, it is possible to prevent unnecessary exposure of the subject and, of course, exposure of the operator. Can also be reduced.

The camera can be installed only by replacing the lamp, which is conventionally contained in the X-ray diaphragm, with the camera. Therefore, structurally there are few changes to the conventional X-ray equipment, and there is almost no increase in price.

By switching the display between the X-ray image and the camera image in conjunction with the X-ray irradiation switch, the X-ray detection image can be viewed during X-ray irradiation and the camera image can be displayed when X-ray irradiation is not performed. It can be seen and the operator does not need any special operation.

Furthermore, even when there are many photographing points as in the case of lower limb blood vessel photographing, by identifying the photographing region of the subject by the difference in the brightness (or color) of the image of the camera and determining the X-ray irradiation range. Positioning of the imaged part and X
The time required to set the line irradiation range is shortened and the operability is improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an outline of a first embodiment of an X-ray apparatus according to the present invention.

FIG. 2 is an overall configuration diagram showing an outline of a second embodiment of an X-ray apparatus according to the present invention.

FIG. 3 is a configuration diagram of a movable diaphragm in a device of the present invention using a TV camera.

FIG. 4 is a conceptual diagram of how to determine the position of an X-ray diaphragm blade (X-ray irradiation range) when the present invention is used for lower limb angiography.

FIG. 5 is a conceptual diagram of how to determine the X-ray irradiation range at the time of imaging a lower extremity blood vessel when the body axis direction of the subject is not parallel to the table.

FIG. 6 is a configuration diagram of a conventional movable diaphragm using a lamp.

[Explanation of symbols]

1 X-ray tube, 2 X-ray diaphragm, 3 subject, 4 image intensifier, 5 support mechanism, 6 table, 7 operation mechanism, 8 X-ray diaphragm operation device, 9 support mechanism operation device, 10 table operation device, 11 X-ray irradiation switch, 15 TV camera, 16
X-ray TV camera, 17 TV signal switch, 18 monitor, 20, 21 upper blade, 22, 23 lower blade, 24, 25 inner blade, 26 lamp, 27 pointer, 28 scale plate, 29 lighting switch, 30 1st Mirror, 31 Second mirror, 35 Additional filter, 36 groove, 37 guard, 38 ring, 39 mounting ring, 40 Upper blade operation knob, 41 Cross plate, 50 Luminance level detection means, 51 Part identification means, 52 X-ray irradiation Range determination means, 53 storage means, 54 operation signal generation means

Claims (5)

[Claims] 1. An X-ray source, an X-ray diaphragm that controls an irradiation range of X-rays emitted from the X-ray source, and an X-ray that detects an X-ray passing through a subject through the X-ray diaphragm and forms an image. A medical X-ray apparatus comprising: a detector, a monitor for displaying the X-ray detection image, and a camera having an imaging range substantially corresponding to the X-ray irradiation range. 2. A movable table on which a patient is placed, and an X table.
The monitor is equipped with a support mechanism that holds the X-ray tube, the X-ray diaphragm, and the X-ray detector and is movable with respect to the table, and an operation mechanism that performs a movement operation of the table and the support mechanism and an X-ray irradiation. 2. The medical X-ray apparatus according to claim 1, wherein the operation mechanism is operated while driving the table and the support mechanism while observing the image to position the X-ray irradiation on the subject. 3. A switching means for displaying an X-ray detection image on the monitor during X-ray irradiation, and for displaying an image of the camera on the monitor when the X-ray is not irradiated. The medical X-ray apparatus according to item 1. 4. The medical X according to claim 1, further comprising means for identifying a region of an object by determining a brightness or a color of an image of the camera to determine an X-ray irradiation range.
Line device. 5. A part of an object is identified based on a difference in brightness or color of an image of the camera, and based on the identification signal, X-ray irradiation is positioned on the object by moving the table or the support mechanism and both of them. The medical X-ray apparatus according to claim 2, wherein the medical X-ray apparatus is configured as described above.