JP2001340332A - Radiodiagnosing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiodiagnosing device wherein the reduction of the exposure to a subject is made possible. SOLUTION: This radiodiagnosing device is equipped with a bed 3 on which the subject is mounted, an X-ray tube device 1, a semiconductor two-dimensional flat surface X-ray sensor (FP) 4, and projectors 6a, 6b, 6c and 6d. In this case, the X-ray tube device 1 performs a radiation to the subject from the back surface direction of the surface of the bed 3 on which the subject is mounted. The semiconductor two-dimensional flat surface X-ray sensor (FP) 4 is arranged in a manner to be confronted with the X-ray tube device 1 across the bed 3, detects the transmitted X ray of the subject, and forms an X-ray image. The projectors 6a, 6b, 6c and 6d detect a distance between the X-ray tube device 1 and the FP 4, and project a radiation region of the X ray corresponding with the X-ray image onto the bed 3 or the subject based on the detected distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray image diagnostic apparatus having X-ray image detecting means for detecting an X-ray transmitted through a subject to generate an X-ray image, and more particularly to an X-ray image diagnostic apparatus having an X-ray source. The present invention relates to an X-ray diagnostic imaging apparatus that allows an examiner to visually recognize an X-ray irradiation area of the X-ray source without irradiating the subject with X-rays from the back side of a surface on which the subject is mounted.

[0002]

2. Description of the Related Art X-rays employed in conventional X-ray diagnostic imaging apparatuses
The X-ray image detecting means converts an X-ray into visible light.
Intensifier (Image Intensifier).
I. ) And a system that generates an X-ray image by capturing the converted visible light with a TV camera and that can generate an X-ray image directly from an X-ray.
FP for tor two-dimensional Flat Panel sensor
"). Behind the transition of this technology, there are needs such as digitization of X-ray images and reduction in size and weight of apparatuses.

A procedure for obtaining an X-ray image is, for example, to irradiate a subject with low-dose X-rays in which various parameters of X-ray irradiation conditions (voltage applied to an X-ray tube device, current, irradiation time) are set low. X-ray image is obtained by performing X-rays with various parameters of X-ray irradiation conditions higher than that of the X-ray image using the position information of the X-ray image obtained by the X-ray image. Do the shooting to get. Further, the X-ray detection capability of the FP depends on the X-ray irradiation conditions, and the fluoroscopy in which various parameters of the X-ray irradiation conditions are set low cannot provide an S / N ratio for diagnosis, and is used exclusively for imaging. There is also.

On the other hand, an X-ray image diagnostic apparatus includes an X-ray tube apparatus for irradiating X-rays from the direction of a surface on which a subject is placed on a bed,
A method called an over-table tube type in which an X-ray image detecting means for detecting the transmitted X-rays of the subject arranged opposite to the X-ray tube apparatus with the bed interposed therebetween, and a surface on which the subject is placed on the bed An X-ray tube device for irradiating X-rays from the rear side of the table, and an X-ray image detecting means arranged to face the X-ray tube device with the bed interposed therebetween and to detect X-ray image transmitted through the subject There is a method called a tube type.

In the above over-table tube type, X
A light source for projecting an X-ray irradiation area onto a subject is provided in the X-ray source, and the X-ray irradiation area for obtaining a fluoroscopic image and a captured image can be projected onto the subject or a bed by the light source.

[0006]

However, in the under-table tube type, even if it has a light source like the over-table tube type, the light source from the X-ray source is blocked by the couch and the subject is exposed to the subject. Since the X-ray irradiation region cannot be projected, the X-ray irradiation region for the radiographed X-ray image cannot be set unless the X-ray image of the fluoroscopy is obtained. There was a risk of doing so.

An object of the present invention is to provide an X-ray diagnostic imaging apparatus capable of reducing exposure to a subject. The other purpose is an under table tube type X
In the X-ray diagnostic apparatus, without irradiating X-rays,
It is an object of the present invention to provide an X-ray image diagnostic apparatus that allows an examiner to easily visually recognize an X-ray irradiation area.

[0008]

The object of the present invention is to provide a bed on which a subject is placed, an X-ray source for irradiating the subject with X-rays from the back side of the bed on which the subject is placed, and the bed. The X-ray source is disposed to face the X-ray source with
X-ray image detecting means for detecting a line and generating an X-ray image;
Means for displaying the generated X-ray image, a means for detecting a distance between the X-ray source and the X-ray image detecting means, and an X-ray diagnostic apparatus based on the detected distance. Means for projecting an X-ray irradiation area corresponding to an image onto the bed or the subject.

Further, there is provided means for storing information on the body thickness of the subject according to the type of the subject, and the projection means includes information on the distance detected by the distance detecting means and information on the body thickness of the subject stored by the storage means. Is achieved by projecting an X-ray irradiation area corresponding to the X-ray image on the bed or the subject based on the X-ray image.

The apparatus further comprises means for detecting a distance between the X-ray source and the X-ray image detecting means and a body thickness of the subject, wherein the projecting means comprises means for detecting the distance detected by the distance detecting means and the body thickness. This is achieved by projecting an X-ray irradiation area corresponding to the X-ray image on the bed or the subject based on the body thickness detected by the detection means.

The projection means may include information on a size of an X-ray incident surface of the X-ray image detecting means and an opening position of an X-ray stop, a distance between the X-ray source and the subject, and an information on the subject. This is achieved by projecting the irradiation area based on at least one of information on the ratio of the distance between the X-ray image detecting means and the distance between the X-ray image detecting means.

Specifically, a distance between an X-ray source (X-ray tube device) and X-ray image detecting means (FP) is detected, and an X-ray corresponding to the X-ray image is detected based on the detected distance. By projecting the irradiation area on the couch or the subject, the examiner can set an appropriate X-ray irradiation area before irradiating the X-ray, and the X-ray irradiation area for imaging can be roughly determined. It is not necessary to obtain an X-ray image of the subject, and X-ray exposure to the subject can be reduced.

Further, the distance between the X-ray tube apparatus and the FP is detected, and information on the body thickness of the subject is stored in association with the difference in the physique of the subject, such as an adult or a child, and the type of the site. By projecting the irradiation area of the X-ray corresponding to the X-ray image on the couch or the subject based on the distance and the information of the stored body thickness of the subject, the thickness of the subject is taken into account, The accuracy of the X-ray irradiation area can be improved. Further, if the body thickness of the subject is actually measured, the accuracy of the X-ray irradiation area can be further improved. Further, when the size of the X-ray incident surface of the FP is changed, the X-ray irradiation area is set according to the change in the size of the X-ray incident surface of the FP. It is possible to provide the examiner with information on the actual X-ray irradiation area that has been obtained.

[0014]

FIG. 1 is a mechanism diagram of an X-ray diagnostic imaging apparatus common to each embodiment of the present invention. The X-ray image diagnostic apparatus is, for example, an under-tube type, and includes an X-ray tube apparatus 1 that is an X-ray source that irradiates an X-ray to a subject on a couch 3,
X-ray diaphragm 2 attached to X-ray tube device 1
FP4, which is an X-ray image detecting means for detecting a transmitted X-ray of the subject as an X-ray image, and an arm portion 5 for rotatably supporting the X-ray tube devices 1 and FP4 in a direction along the arm. And That is, the arm 5 is shown in FIG.
From (a) to FIG. 1 (b) or from FIG. 1 (b) to FIG.
(A) The X-ray tube apparatus 1 and the FP4 are rotatably supported. The X-ray image diagnostic apparatus having the above configuration irradiates the subject on the couch 3 with the X-rays from the X-ray tube device 1, and detects the X-rays transmitted through the subject as an X-ray image by the FP4. The detected X-ray image is displayed on a display such as a TV monitor (not shown).

By the way, from FIG. 1A to FIG.
If only the tube apparatus 1 and the FP4 are rotationally moved, the subject's head goes out of the X-ray irradiation area. Therefore, the examiner is required to position the subject's head within the X-ray irradiation area. It is necessary to move the bed 3. Conventionally, however, it is necessary to obtain a fluoroscopic image to confirm that the subject's head is within the X-ray irradiation area, and this confirmation involves trial and error, and there is a concern that X-ray exposure will increase. Was.

Therefore, a light projector is attached to the FP, the light from the light projector is projected onto a subject or a bed, and the projected area is visualized as an X-ray irradiation area, so that a conventional fluoroscopic X-ray image can be obtained. It is the gist of the present invention that the positioning for photographing is performed without obtaining it, and the configuration and each embodiment will be described in order.

First, an X-ray irradiation area projection mechanism is shown in FIG.
This will be described using FIGS. FIG. 2 is a diagram showing an arrangement relationship between the FP and the X-ray irradiation area projection mechanism of FIG. 1 and the subject and the X-ray tube device. FIG. 3 is a mounting diagram of the FP and the X-ray irradiation projection mechanism of FIG.
FIG. 4 is a structural view of the light projector of FIG.

X-rays emitted from the X-ray tube apparatus 1 are shown in FIG.
As shown in (a), the irradiation area is set in a quadrangular pyramid shape through the X-ray diaphragm 2. In such an X-ray irradiation area, the shape projected on the subject is a rectangle or a square. Therefore, near the middle point of each side of the rectangular FP4, FP4
The projectors 6a, 6b, 6c, and 6d, which can be freely attached at different angles, are provided, and the light from the projectors 6a, 6b, 6c, and 6d is projected onto the subject in a line shape, so that the X-ray irradiation area can be projected onto the subject. Will be visible. The mechanism for making the mounting angle freely will be described later.

FIG. 2B is a plan view of FIG. 2A as viewed from above the FP4. Each projector 6a, 6b,
A rectangular X-ray irradiation area is formed by 6c and 6d as shown by a dotted line in the figure. In this case, the center of the X-ray irradiation area is the position of the focal point of the X-ray tube device.

The FP 4 and the projector 6 are mounted as shown in FIG. 3 so that the mounting angle between the FP 4 and the projector 6 can be changed. Here, for simplicity, a rectangular F
An example will be described using one side of P4. This structure comprises a projector support 7 for fixing a shaft 8 for rotatably mounting a projector 6 and a motor 12, a motor 12, and a motor 1.
The pulley 11 includes a pulley 11 attached to the second rotating shaft, a pulley 9 attached to the shaft 8, and a belt 10 that transmits power from the pulley 11 to the pulley 9. Further, as shown in FIG. 4, the motor 12 is controlled by the control unit 16.
The rotation direction and rotation speed are controlled. Then, the operation is such that the control unit 16 obtains control data from the projector control unit 24 described in each of the embodiments described later, and the control unit 16 determines the rotation direction and the number of rotation parameters of the motor 12 from the control data. It is generated by controlling the motor 12 based on the generated parameters.

As shown in FIG. 4, the light generating system of the light projector 6 includes a light source 13 for generating visible light having linearity, such as a laser, and an optical diaphragm 14a for forming an optical path of the visible light from the light source 13. , 14b, optical diaphragm supports 15a, 15b supporting the width of the optical path to be variable by the optical diaphragms 14a, 14b, turning on / off of the light source 13, and the optical diaphragm 1
And a control unit 16 for controlling the width of the optical path formed by 4a and 14b. The operation is such that the control unit 16 obtains control data from the projector controller 24, and the control unit 16 turns on / off the light source 13 from the control data, and increases the width of the optical path formed by the optical diaphragms 14a and 14b. The parameters are generated by controlling the light source 13 and the optical apertures 14a and 14b based on the generated parameters. Further, since the optical diaphragms 14a and 14b employ a well-known mechanism capable of moving each of them in parallel, detailed description will be omitted.

<First Embodiment> Next, a first embodiment of the present invention will be described.
The configuration and operation of the X-ray irradiation projection mechanism according to the embodiment will be described with reference to FIGS. FIG. 5 is a block diagram of a projector control system according to an embodiment of the present invention, and FIG.
FIG. 7 is a view showing a state in which only the bed 4 is moved, and FIG.
FIG. 8 is a diagram showing a state in which only the X-ray tube apparatus 1 and the FP 4 are moved in the circumferential direction of the arm 5, and FIG.
It is a figure showing a mode at the time of moving only P4.

The floodlight control system according to the first embodiment includes:
As shown in FIG. 5, when the arm unit 5 supporting the X-ray tube apparatus 1 and the FP 4 is moved in the circumferential direction, the arm controller 18 that controls the movement while detecting the position thereof, and the bed 3 on which the subject is placed are arranged. The bed controller 19 which controls the movement while detecting the position when moving up and down from the floor surface, and moves while detecting the position when moving the FP 4 tangentially to the circumferential direction of the arm portion 5 An FP controller 20 for controlling;
An X-ray aperture operation device 21 that controls movement while detecting the size of the aperture of the X-ray aperture 2 attached to the X-ray tube device 1;
An operating device 23 for setting conditions of X-rays generated at the time of fluoroscopy or imaging by an examiner's operation, an arm controller 18, a bed controller 19, an FP controller 20, an X-ray diaphragm controller 21,
Based on various data from the operation unit 23, the mounting angles of the FP 4 and the light projector 6, the turning on / off of the light source 13, and the width of the optical path formed by the optical diaphragm are calculated, and the light projectors 6a, 6b, 6c, 6 are calculated.
and a floodlight controller 24 for outputting to the controller 16 of FIG.

The projector controller 24 includes the arm controller 18,
Based on the position information detected by the bed controller 19 and the FP controller 20, respectively, the FP 4 and the projectors 6a, 6b, 6
The angle of attachment to each of c and 6d, that is, the X-ray irradiation area is calculated, and the control unit 16 of the projectors 6a, 6b, 6c and 6d is calculated.
Output to

Since the positions of the X-ray tube devices 1 and FP4 move while detecting their respective positions, the X-ray tube devices 1 and F
The approximate distance of P4 is measured. Based on the measured distance, the mounting angle of each of the FP 4 and the projectors 6a, 6b, 6c, 6d is directed to the direction of the focal point of the X-ray tube device 1, the light source 13 is turned on, and the optical apertures 14a, 14b are set to predetermined positions. Is controlled so as to form an opening of the X-ray, an approximate X-ray irradiation area as shown in FIG.
Can be projected on top.

Next, in the first embodiment, F
A mode in which only P4 is moved, a mode in which only bed 3 is moved,
An embodiment in which the X-ray tube device 1 and the FP 4 are rotated in the circumferential direction of the arm unit 5 and only the FP is moved will be described with reference to FIGS.

In a mode in which only the FP4 is moved, as shown in FIG. 6, the FP4 is arranged at the position A, the X-ray radiated from the X-ray tube apparatus 1 is irradiated on the subject, and the transmission of the subject is performed. X
The line is received by FP4 to obtain an X-ray image. The X-ray irradiation area when the FP4 is located at the position A is projected on the subject at the position a. Next, the examiner operates the operating device 23 to operate the FP4.
Is moved to position B only. After the FP4 moves to the position B, the mounting angle between the FP4 and the projector 6 is changed to the position B of the FP4.
The movement of the X-ray tube apparatus 1 is controlled so as to be approximately in the direction of the focal point. As in this case, when the distance between the X-ray tube device 1 and the FP4 is reduced, the projector controller 24 is linked to the projector 6 on each side of the FP4 so that the angle formed between the FP4 and the projector 6 is reduced. The motor is controlled so that the light from the projector 6 is directed substantially toward the focal direction of the X-ray tube device 1. This movement control may be performed in accordance with the movement of the FP4. Then, the X-ray irradiation area when the FP 4 moves to the position B is projected on the subject at the position b. With this operation, the examiner can obtain an X-ray image in the irradiation area at the position b of the subject in the same manner as at the position a.

In a mode in which only the couch 3 is moved, as shown in FIG. 7, the couch 3 is arranged at a position C, and the subject is irradiated with X-rays emitted from the X-ray tube apparatus 1. Transmission X
The line is received by FP4 to obtain an X-ray image. The X-ray irradiation area when the couch 3 is located at the position C is projected onto the subject at the position c. Next, the examiner operates the operation device 23 to operate the bed 3.
Only move to position D. In this case, since only the bed 3 moves, the distance between the X-ray tube apparatus 1 and the FP 4 does not change. Then, the X-ray irradiation area when the couch 3 moves to the position D is projected onto the subject at the position d. With this operation, the examiner can obtain the d of the subject.
An X-ray image can be obtained in the irradiation area at the position as in the case of the position c.

There are two methods in FIGS. 6 and 7 in which the subject is brought close to the FP 4. However, the control in which only the bed 3 can be moved without changing the mounting angle of the projector 6 is more controlled. Easy. Considering that the mounting angle of the light projector 6 does not need to be changed, a configuration in which the mounting angle of the FP 4 and the light projector 6 is fixed can be considered. According to this fixed configuration, a rotating mechanism such as a motor is not required,
The light projector 6 can be reduced in size and weight.

As shown in FIG. 8, the X-ray tube apparatus 1 and the FP 4 are rotated in the circumferential direction of the arm 5 and only the FP is moved. 1
The subject is irradiated with X-rays from the subject, the transmitted X-rays of the subject are received by the FP4, and an X-ray image is obtained. The X-ray irradiation area when the FP 4 is at the position E is projected onto the subject at the position e.
Next, the FP 4 is arranged at the position of F in proximity to the subject. In accordance with the movement of the FP 4 from the position E to the position F, the movement control of the mounting angle of the projector 6 with the FP 4 is performed. In this movement control, the movement is controlled so as to match the direction of the focal point of the X-ray tube device. Even if this movement control is performed along with the movement of FP4,
It may be performed after P4 moves to the position F. And F
The X-ray irradiation area where P4 is at position F is projected onto the subject at position f. The examiner can obtain an X-ray image in a state where the FP4 is arranged at the position F as in the case of the position E.

<Second Embodiment> Next, a second embodiment of the present invention will be described.
The configuration and operation of the X-ray irradiation projection mechanism according to the embodiment will be described with reference to FIG. The projector control system according to the second embodiment is different from the first embodiment in that the body thickness data storage unit 22
Is added. The body thickness data storage unit 22 stores the type of the body thickness of the subject, for example, the data of the physique of an adult or a child, or the standard value of the body thickness of a fluoroscopic or imaging part such as the chest and abdomen.

The projector controller 24 includes the arm controller 18,
The FP 4 and the projectors 6a, 6b, 6c, 6 are based on the position information detected by the bed controller 19 and the FP controller 20, respectively, and the body thickness of the subject read from the body thickness data storage unit 22.
The angle of attachment with each of d, that is, the X-ray irradiation area is calculated and output to the control unit 16 of the projectors 6a, 6b, 6c, 6d.

Since the positions of the X-ray tube devices 1 and FP4 move while detecting the respective positions, the X-ray tube devices 1 and FP4 are moved.
A distance of 4 is measured. Further, based on the measured distance and the body thickness data read from the body thickness data storage unit 22, F
If the mounting angles of the P4 and the light projectors 6a, 6b, 6c, 6d are directed toward the subject, the light source 13 is turned on, and the optical apertures 14a, 14b are controlled so as to form a predetermined opening. A more accurate X-ray irradiation area can be projected on the subject in consideration of the body thickness of the subject.

<Third Embodiment> Next, a third embodiment of the present invention will be described.
The configuration and operation of the X-ray irradiation projection mechanism according to the embodiment will be described with reference to FIGS. FIG. 9 is a block diagram of a projector control system according to another embodiment of the present invention.
0 is a diagram illustrating the principle of calculating the body thickness of the subject.

FIG. 9 shows a control unit according to the third embodiment.
The difference from the control unit of the first embodiment is that a body thickness data measurement unit 25 is used instead of the body thickness data storage unit 22. As shown in FIG. 10, the body thickness data measurement unit 25 irradiates the distance measurement sensor 26 toward the thickest part of the body of the subject, and the reflected wave of the distance measurement sensor 26
Is measured, and the thickness of the subject is obtained by subtracting the measured distance from the distance between the FP 4 and the bed 3.

That is, if the attachment angle between the distance sensor 26 and the FP4 is θ, the distance measured by the distance measurement sensor 26 is D2, and the distance between the FP4 and the bed 3 is D1, the body thickness D3 of the subject is obtained. Can be expressed by the following equation (1). D3 = D1−D2 · sin θ (1) Instead of the body thickness data read from the body thickness data storage unit 22, the measured body thickness information D3 of the subject and the X-ray tube apparatus 1−
Based on the distance between FP4, FP4 and projectors 6a, 6b,
The mounting angles of 6c and 6d are directed toward the subject, the light source 13 is turned on, and the optical diaphragms 14a and 14b are turned on.
If a control is performed so that a predetermined opening is formed, a more accurate X-ray irradiation area can be projected onto the subject.

<Fourth Embodiment> Next, a case where the size of the X-ray incidence surface of the FP 4 is changed by moving the X-ray stop or the like will be described with reference to FIGS. .
FIG. 11 is a diagram showing a mode in which the X-ray incident surface of FP4 is set by switching a switch in FP4.

The FP4 has a function of arbitrarily setting the size of the X-ray incident surface. This is a measurement method that emphasizes obtaining an X-ray image at a high frame rate by making the X-ray incident surface relatively small, and an X-ray in a wider X-ray irradiation area by using the X-ray incident surface relatively large. This is to enable a measurement method that emphasizes obtaining an image. For example, as shown in FIG. 11, it is necessary to measure the chest of the subject at a high frame rate in a situation where the light beam from the projector 6 is set to be projected on the subject at the position of g. Was. Therefore, the FP controller 20 sets the black-out area of the FP4 as the X-ray incident area. The projector controller 24 is set based on the X-ray incidence area from the FP controller 20 so that the light beam from the projector 6 is projected onto the subject at the position h.

The case where the setting of the X-ray incidence surface of the FP 4 is changed by the X-ray aperture will be described with reference to FIG. FIG. 12 is a diagram showing a mode in which the X-ray stop 2 sets the X-ray incident surface of the FP 4.

The X-ray stop 2 has a function of arbitrarily setting the size of the X-ray incidence surface of the FP 4. This is X
Due to differences in the amount of X-ray absorption at the site where the line image is collected,
The incident X-rays received at the peripheral portion of the FP increase sharply more than the incident X-rays received at the central portion of the FP, which may cause excessive X-ray exposure (halation), which does not substantially contribute to diagnosis. This is because the region is not irradiated with X-rays. For example, as shown in FIG. 12, in a situation where the light from the light projector 6 is set to be projected on the subject at the position of i, halation may occur in the position of i in the X-ray irradiation area. Was known above. Therefore, the X-ray aperture controller 21 sets the X-ray incidence area so as to be regulated by one piece of the X-ray aperture according to the solid line passing through j on the subject. The projector controller 24 is the X-ray aperture controller 2
Based on the X-ray incident area from No. 1, the light from the projector 6 is set so as to be projected on the subject at the position of j.

<Other Embodiments> In addition, since the projector is irradiated according to the shape of the image area of the FP4, the subject can be quickly positioned even in an X-ray irradiation area such as a rectangle, and the inspection region of the subject can be inspected. Measurement of an X-ray image adapted to a special shape suitable for the subject, for example, an extremely long effective image region suitable for lower limb imaging, a horizontally long effective image region suitable for a renal artery, and the like can be efficiently combined.

Although the above embodiment has been described by projecting the light beam from the light projector onto the subject, if the X-ray irradiation region is biased, the X-ray irradiation region is not projected onto the subject. This also includes cases where the image is projected on objects other than the subject such as a bed, sheets covering the bed, and a ket placed on the subject.

In addition, by combining the conventional over-table tube type light source with the projector of the present invention, the X-ray irradiating region is formed on the subject in any of the over-table tube type and the under-table tube type. May be visually recognized. In this case, it is possible to provide the examiner with information on the X-ray irradiation area for imaging without performing fluoroscopy in any of the aspects.

Further, according to the present invention, a light projector is attached to the FP, the light from the light projector is projected on the subject, and the light is visualized as an X-ray irradiation area. It is a technical idea to reduce the X-ray exposure of the subject by performing alignment, and all embodiments capable of implementing this are included in the present invention.

[0045]

According to the X-ray diagnostic imaging apparatus of the present invention, the exposure to the subject can be reduced. Further, in the X-ray image diagnostic apparatus of the under table tube type, the examiner can easily visually recognize the X-ray irradiation area without irradiating the X-ray.

[Brief description of the drawings]

FIG. 1 is a mechanism diagram of an X-ray image diagnostic apparatus common to each embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement relationship among an FP, an X-ray irradiation area projection mechanism, a subject, and an X-ray tube device in FIG. 1;

FIG. 3 is a mounting diagram of the FP of FIG. 2 and an X-ray irradiation projection mechanism.

FIG. 4 is a structural view of the light projector of FIG. 3;

FIG. 5 is a block diagram of a projector control system according to the embodiment of the present invention.

FIG. 6 is a diagram showing an aspect when only FP4 is moved.

FIG. 7 is a diagram showing an aspect when only the bed 3 is moved.

FIG. 8 is a diagram showing a state in which the X-ray tube device 1, the FP4, and the arm unit 5 are rotated in the circumferential direction, and only the FP4 is moved.

FIG. 9 is a block diagram of a projector control system according to another embodiment of the present invention.

FIG. 10 is a diagram showing a principle of calculating a body thickness of a subject.

FIG. 11 is a diagram showing a mode in which an X-ray incident surface of the FP4 is set by switching a switch in the FP4.

FIG. 12 is a diagram showing a mode in which the X-ray stop 2 sets an X-ray incident surface of the FP 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... X-ray tube apparatus, 3 ... Bed, 4 ... Semiconductor 2D planar X-ray sensor (FP), 6, 6a, 6b, 6c, 6d ... Projector

Claims (4)

[Claims] 1. A bed on which a subject is placed, an X-ray source for irradiating the subject with X-rays from a back side of a surface of the bed on which the subject is placed, and the X-ray source with the bed interposed therebetween. An X-ray image diagnostic apparatus, comprising: an X-ray image detecting unit that is disposed to face and detects an X-ray transmitted through the subject to generate an X-ray image; and a unit that displays the generated X-ray image. Means for detecting a distance between a source and the X-ray image detecting means;
Means for projecting an X-ray irradiation area corresponding to the X-ray image onto the bed or the subject based on the detected distance. 2. The apparatus according to claim 1, further comprising: a storage unit configured to store information on a body thickness of the subject according to a type of the subject, wherein the projection unit stores information on a distance detected by the distance detection unit and a body thickness of the subject stored by the storage unit. The X-ray image diagnostic apparatus according to claim 1, wherein an X-ray irradiation area corresponding to the X-ray image is projected on the bed or the subject based on the X-ray image. 3. The apparatus according to claim 1, further comprising: means for detecting a distance between the X-ray source and the X-ray image detecting means and a body thickness of the subject, wherein the projecting means comprises means for detecting the distance detected by the distance detecting means and the body thickness. The X-ray image diagnostic apparatus according to claim 1, wherein an X-ray irradiation area corresponding to the X-ray image is projected on the bed or the subject based on the body thickness detected by the detection unit. 4. The X-ray image detecting means includes information on a size of an X-ray incident surface and an opening position of an X-ray aperture, a distance between the X-ray source and the subject, and the subject. The X-ray image diagnostic apparatus according to any one of claims 1 to 3, wherein the irradiation area is projected based on at least one of information on a ratio of a distance to the X-ray image detecting means.