JPH07116149A - X-ray diagnostic apparatus - Google Patents

Abstract

PURPOSE:To provide an x-ray diagnostic apparatus not radiating unnecessary x-rays in roentgenographing and roentgenoscoping at oblique incident angles. CONSTITUTION:An x-ray tube 1 turns around a center axis CP to enable roentgenographing and roentgenoscoping at oblique incident angles. A determining unit 31 of x-ray reducing amount determines x-rays reducing amount required for a brief incidence of x-rays radiated from the x-ray tube 1 into the effective field of a film F surface in roentgenographing at oblique incident angles or into the effective field on the x-ray detecting surface of an image intesifier 3 in roentgenoscoping at oblique incident angles on the basis of turning angles set by a setting unit 16. An x-ray reduction controller 32 operates and controls a motor adjusting the x-ray reducing mechanism in a collimator 7 on the basis of the reducing amount determined by the determining unit 31 and adjusts the reducing amount of radiated x-rays by the x-ray reducing mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X having a function of irradiating an object with X-rays from an oblique direction to perform X-ray imaging (angle-of-incidence imaging) and fluoroscopy (angle-of-incidence fluoroscopy). The present invention relates to a line diagnostic device.

[0002]

2. Description of the Related Art A conventional X-ray diagnostic apparatus of this type is shown in FIG.
As shown in FIG. 1, an X-ray tube 1, a quick-photographing device 2, and an image intensifier device (hereinafter, referred to as “II device”) 3 are arranged with a subject M lying on a top plate 4 interposed therebetween. Is configured. The quick-shooting apparatus 2 is, for example, a cassette-less quick-shooting apparatus, films of various sizes are stored in the film magazine 2a, and a predetermined film F is set at a shooting position (the film F indicated by a dotted line) at the time of shooting.
(The position where is placed) is set. In addition, I. A TV camera 5 is connected to the I. device 3 and the I.I.
The X-ray fluoroscopic image double-converted into visible light by the I-device 3 is photographed by the television camera 5 and displayed on a monitor (not shown).

The X-ray tube 1 is supported by a column 6. The column 6 is configured to be swingable about a shaft (rotation center axis) CP extending on the film F at the photographing position in a direction perpendicular to the paper surface. Due to the swinging motion of the column 6, the X-ray tube 1
The subject M is rotated around an axis (axis perpendicular to the paper surface: CP) parallel to the axis orthogonal to the body axis J of the subject M, so that the subject M can be irradiated with X-rays from the oblique direction.

Further, a collimator 7 is arranged below the X-ray tube 1, and an X-ray diaphragm leaf 8 in the collimator 7 narrows down the X-rays irradiated to the subject M. This aperture amount is, for example, when the X-ray tube 1 is used for the subject M during X-ray imaging.
It is adjusted so that X-rays are emitted into the effective visual field of the film F at the photographing position in the state of being vertically above.

[0005]

However, the conventional example having such a structure has the following problems. For example, during X-ray imaging, when the X-ray tube 1 is rotated and the subject M is irradiated with X-rays from the oblique direction, X-rays that do not enter the effective visual field of the film are irradiated, and There is a problem that the subject M is irradiated with unnecessary X-rays. This will be described with reference to FIG.

FIG. 18A shows an X-ray focal point X in the X-ray tube 1.
The state in which the film F at the photographing position is irradiated with X-rays from S is simplified and drawn. X-ray diaphragm leaf 8 is X
The X-ray diaphragm amount is adjusted so that the X-ray is irradiated within the effective visual field of the film F in a state where the ray tube 1 is perpendicular to the surface of the film F (vertically above the subject). As shown in the figure, X
In the state where the ray tube 1 is perpendicular to the plane of the film F, the X-rays XR to be irradiated are incident on the effective field of the film F.
However, when the X-ray tube 1 is rotated, the irradiated X
The line XR spreads to the left and right of the film F, and a part of the irradiated X-ray is not incident on the effective field of the film F. That is, when X-ray imaging (oblique angle shooting) is performed while the X-ray tube 1 is rotated, the subject M is irradiated with X-rays (X-rays that are applied to the BX region) unnecessary for X-ray imaging. Therefore, there is a problem that the X-ray exposure dose to the subject unnecessarily increases.

Further, as shown in FIG. 18 (b), when the X-ray fluoroscopy (oblique angle perspective) is performed while the X-ray tube 1 is rotated, the I.D. The same problem as described above occurs in that the subject M is irradiated with X-rays that do not enter the effective visual field IX of the X-ray detection surface of the I-device 3.

The present invention has been made in view of the above circumstances, and is also useful for oblique-angle shooting and oblique-angle fluoroscopy.
It is an object of the present invention to provide an X-ray diagnostic apparatus that does not irradiate a subject with X-rays unnecessary for X-ray imaging and fluoroscopy.

[0009]

The present invention has the following constitution in order to achieve such an object. That is, the present invention provides a top plate on which a subject is laid down, an X-ray tube, and an X-ray photographing means for photographing a transmitted X-ray transmitted through the subject lying on the top plate on a film, and / or the above. An X-ray fluoroscope for detecting a transmitted X-ray to obtain an X-ray fluoroscopic image, and the X-ray tube around a predetermined axis (rotation center axis) parallel to an axis orthogonal to the body axis of the subject. X-axis from the oblique direction with respect to the subject lying on the top and the film surface of the X-ray imaging means and / or the X-ray detection surface of the X-ray fluoroscopic means. In an X-ray diagnostic apparatus configured to be capable of irradiating X-rays, X-ray diaphragm means for narrowing X-rays emitted from the X-ray tube, and X-ray diaphragm adjustment for adjusting the X-ray diaphragm amount by the X-ray diaphragm means. Means and said X
Based on the angle information capturing means for capturing the rotation angle information at the time of rotating the ray tube, and the X-rays emitted from the X-ray tube based on the rotation angle information captured by the angle information capturing means Within the field of view or X of the X-ray fluoroscopic means
The X which is necessary for causing the light to substantially enter the effective visual field of the line detection surface.
X-ray diaphragm adjustment amount specifying means for obtaining the adjustment amount of the line diaphragm, and X-ray diaphragm control means for driving and controlling the X-ray diaphragm adjusting means based on the adjustment amount obtained by the X-ray diaphragm adjustment amount specifying means. Be prepared.

[0010]

The operation of the present invention is as follows. The angle information capturing means captures rotation angle information when the X-ray tube rotates about a rotation center axis parallel to an axis orthogonal to the body axis of the subject. The X-ray diaphragm adjustment amount specifying means determines the X-ray emitted from the X-ray tube within the effective visual field of the film surface (during X-ray photography) based on the rotation angle information captured by the angle information capturing means.
Alternatively, the adjustment amount of the X-ray diaphragm required to make the light incident substantially within the effective visual field (during X-ray fluoroscopy) of the X-ray detection surface of the X-ray fluoroscopy means is obtained. The X-ray diaphragm control means drives and controls the X-ray diaphragm adjusting means on the basis of the adjustment amount obtained by the X-ray diaphragm adjustment amount specifying means, and adjusts the diaphragm amount of the irradiated X-rays by the X-ray diaphragm means.

As a result, in oblique-angle photography, most or all of the X-rays that do not enter the effective field of view of the film surface are narrowed down by the X-ray diaphragm means, so that X-rays not necessary for X-ray photography are examined. Can be prevented from being irradiated. Further, even during oblique angle fluoroscopy, it is possible to prevent the subject from being irradiated with X-rays that are not incident on the effective field of view of the X-ray detection surface of the X-ray fluoroscopy means and that are unnecessary for X-ray fluoroscopy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a front view showing a schematic configuration of an X-ray diagnostic apparatus according to the first embodiment of the present invention.
(B) is the side view. In the first embodiment and each of the following embodiments, an X-ray fluoroscopic imaging apparatus capable of performing X-ray imaging and fluoroscopy on a film will be described as an example.
The present invention can be similarly applied to an X-ray imaging apparatus capable of only radiography and an X-ray fluoroscopic apparatus capable of only X-ray fluoroscopy.

As shown in the figure, this first embodiment device is
The X-ray tube 1, the quick-shooting apparatus 2, the I.D. The I-device 3 is arranged such that the subject M lying on the top 4 is sandwiched therebetween. The quick photographing apparatus 2 as the X-ray photographing means is, for example,
The cassette is composed of a rapid shooting device, various sizes of films are stored in the film magazine 2a, and a predetermined film F is conveyed to a shooting position (position where the film F shown by a dotted line is arranged) at the time of shooting and set. To be done.

In addition, I.D. A TV camera 5 is connected to the I. device 3 and the I.I. The X-ray fluoroscopic image double-converted into visible light by the I-device 3 is photographed by the television camera 5 and displayed on a monitor (not shown). These I. The I-device 3, the television camera 5 and the like correspond to the X-ray fluoroscopic means in this invention.

These quick shooting devices 2, I.D. The I-device 3 and the top plate 4 are fixedly supported by the main frame 11 together with the fan-shaped rack 10. A rotating shaft 12 is fixedly mounted on the fan-shaped rack 10. The fan-shaped rack 10 is supported by the main frame 11 so that the center of the rotating shaft 12 coincides with the axis CP passing through the film F set at the shooting position of the quick shooting device 2.

The column 6 for supporting the X-ray tube 1 is rotatably fitted to the rotary shaft 12, and the pinion 13 meshing with the fan-shaped rack 10 is led out from the column 6. The pinion 13 has a configuration in which the rotation of the motor 14 provided in the column 6 is transmitted through the speed reducer 15 and is rotated in the forward and reverse directions.

By rotating the motor 14 in the forward and reverse directions, the pinion 13 meshes with the fan-shaped rack 10 and swings the column 6 left and right about the axis CP. As a result, the X-ray tube 1 supported by the support column 6 has the body axis J of the subject M.
It is rotated about an axis parallel to the axis orthogonal to (an axis perpendicular to the paper surface: CP), so that the subject M can be irradiated with X-rays in the oblique direction.

The rotation angle of the X-ray tube 1 is set by the operator from the setting device 16. The set rotation angle is given to the rotation speed specifying unit 17. The rotation speed specifying unit 17 specifies the rotation speed of the motor 14 according to the rotation angle. Then, the rotary motor drive control unit 18 drives and controls the motor 14 so as to rotate at the rotation speed.

A collimator 7 is arranged below the X-ray tube 1. In the collimator 7, an X-ray diaphragm mechanism 20 that narrows down the X-rays irradiated on the subject M is provided. The structure of the X-ray diaphragm mechanism 20 will be described with reference to FIG.

The X-ray diaphragm mechanism 20 is shown in FIGS. 2 (a) and 2 (b).
As shown in FIG. 3, it is composed of X-ray diaphragm leaves 21, 22, and 23. The X-ray diaphragm leaf 21 is provided with an opening 21a through which X-rays pass. This X-ray leaf 21
A rack 21 extending in the Y direction parallel to the body axis J is provided on the side of the
b is provided, and the pinion 2 that meshes with the rack 21b
1c is connected to a rotating shaft of a motor 21d fixed to the collimator 7. The X-ray diaphragm leaf 21 is configured to be moved in the Y direction by the rotation of the motor 21d.

The X-ray diaphragm leaf 22 has the same structure as that of the X-ray diaphragm leaf 21, and is rotated by the motor 22d.
It is configured to move in the Y direction independently of the X-ray diaphragm leaf 21.

Further, the X-ray diaphragm leaf 23 is constructed so that the two leaves 23a and 23b are moved in synchronization in the Y direction. That is, the wire 23e hung on the pulleys 23c and 23d is connected to the leaves 23a and 23b at Pa and Pb, and by moving the wire 23e, the leaves 23a and 23b move in synchronization in the Y direction. To be done. The wire 23e is the motor 2
It is moved by the rotation of 3f.

With the above construction, the motors 21d, 22
By independently driving d and 23f, Y
It is possible to adjust the X-ray diaphragm amount in the right and left directions independently. For example, as shown in FIGS. 2B and 2C, the X-ray diaphragm leaf 23 adjusts the diaphragm amount according to the film, and the X-ray diaphragm leaf 21 adjusts the diaphragm amount on the right side of the X-ray in the Y direction. With the X-ray diaphragm leaf 22, the diaphragm amount on the left side of the X-ray in the Y direction can be adjusted. In the figure, XS
Indicates an X-ray focal point in the X-ray tube 1.

The motors 21d, 22d, and 23f are drive-controlled by an X-ray diaphragm controller, which will be described later. The X-ray diaphragm mechanism 20 corresponds to the X-ray diaphragm means in the present invention, and the motors 21d, 22d, 23f correspond to the X-ray diaphragm amount adjusting means in the invention.

By the way, the configuration for adjusting the X-ray diaphragm amount in the Y direction independently on the left and right sides may be configured as shown in FIG. 3 other than the above. In the X-ray diaphragm leaf 24 of FIG. 3, two leaves 24a and 24b are connected to wires 24c and 24d at Pa and Pb portions, respectively, and the diaphragm amounts are independently adjusted by motors 24e and 24f. With such a configuration, and by independently driving the motors 24e and 24f, the X-ray diaphragm amount in the Y direction can be adjusted independently on the left and right.

Returning to FIG. 1, from the setting device 16, as described above, the support column 6 is swung, that is, the X-ray tube 1 is rotated about a central axis parallel to an axis orthogonal to the body axis J of the subject M. The rotation angle rotated around the CP is set by the operator. The rotation angle set in this way is X
It is given to the line diaphragm adjustment amount specifying unit 31. This setting device 1
Reference numeral 6 corresponds to the angle information capturing means in the present invention.

In this embodiment, the rotation angle information of the X-ray tube 1 is fetched by the set value from the setting device 16. However, for example, the rotation angle in the rotated state of the X-ray tube 1 is set as an angle. You may comprise so that it may be detected and taken in with a detector etc. As the angle detector at this time, for example,
A rotary encoder may be used to detect the number of revolutions of the motor 14 that causes the support 6 to swing, and the detected number of revolutions may be multiplied by the swinging angle per one rotation to obtain the rotation angle. It may be configured to be taken from.

In addition to the rotation angle, the setting device 16 also sets various information for driving the device, for example, information such as film size at the time of shooting, and the entire device is driven based on the information. To be done.

The X-ray diaphragm adjustment amount specifying unit 31 includes the setting device 1
Based on the rotation angle information set in step 6, the X-rays emitted from the X-ray tube 1 are irradiated within the effective field of view of the film surface (at the time of X-ray photography) or I.S. The adjustment amount of the X-ray diaphragm mechanism 20 necessary for making the light incident on the X-ray detection surface of the I-device 3 (during X-ray fluoroscopy) is obtained. The X-ray diaphragm adjustment amount specifying unit 31 corresponds to the X-ray diaphragm adjustment amount specifying unit in this invention.

Then, the X-ray diaphragm control unit 32 controls the drive of the motors 21d, 22d, 23f of the X-ray diaphragm mechanism 20 based on the adjustment amount obtained by the X-ray diaphragm adjustment amount specifying unit 31. The X-ray diaphragm control unit 32 corresponds to the X-ray diaphragm control means in this invention.

Next, the operation of the first embodiment apparatus having the above-mentioned structure will be described. First, the operation during X-ray photography is shown in FIG.
Will be described with reference to. FIG. 4 shows an X-ray focal point X in the X-ray tube 1.
The state in which the film F at the photographing position is irradiated with X-rays from S is simplified and drawn.

First, at the position where the X-ray tube 1 is perpendicular to the film F (rotation angle is 0 °), the X-ray diaphragm of the X-ray diaphragm mechanism 20 is arranged so that the X-rays enter the effective field of the film F. The amount is adjusted. That is, when the rotation angle (0 °) and the size of the film F used for shooting are set from the setting device 16, the X-ray diaphragm adjustment amount specifying unit 31 in the X-ray diaphragm adjustment amount specifying unit 31 determines the X-ray diaphragm leaves 21 and 22. , 23 for the X-ray diaphragm adjustment amount. At this time, as shown in FIG. 2B, the X-ray diaphragm leaves 21 and 22 are in a state where the X-ray diaphragm is not performed, and the X-ray diaphragm leaf 23 is within the effective visual field of the film F used. So that X-rays are incident,
The motors 21d, 2 for the X-ray diaphragm leaves 21, 22, 23
The drive amounts of 2d and 23f are obtained. Then, the X-ray diaphragm control unit 32 uses the drive amount to drive the motors 21d, 22d, 2 and 2.
3f is driven to adjust the X-ray aperture amount. In FIG. 4, X
It is adjusted so that it is opened to the left and right from the line focus XS. It should be noted that Y of the effective visual field of the film F used for shooting
The length in the direction is a. When X-rays are irradiated in this state, all the irradiated X-rays enter the effective visual field of the film F.

Next, the X-ray tube 1 is rotated, for example, to the right by θ °. At this time, when X-rays are irradiated in a state where the X-ray focal point XS is opened to the left and right by α °, part of the X-rays does not enter the film F. So, as shown by the dotted line in the figure,
The X-rays emitted by the X-ray diaphragm leaves 21 and 22 are adjusted so as to emit the X-rays. The procedure will be described below.

That is, on the basis of the rotation angle θ ° of the X-ray tube 1, the X-ray diaphragm adjustment amount specifying unit 31 sets the X-ray diaphragm leaf 2.
The adjustment amounts of 1 and 22 are obtained as follows, for example.

First, in FIG. 4A, γ _L can be obtained as follows. L ₁ = L ₂ + a / 2 L ₂ = L · sin θ L ₃ = L · cos θ β _L = arctan (L ₁ / L ₃ ) γ _L = (θ−α) −β _L Note that L is the X-ray focal point. It is the length between XS and the center of rotation CP (see FIG. 1) and is determined when the device is designed. Also, α is
As described above, it is determined by the aperture amount of the X-ray aperture leaf 23,
a is the length of the effective visual field of the film F in the Y direction as described above. Therefore, γ _L is uniquely determined when θ is determined.

On the other hand, γ _R can be obtained as follows. L ₄ = L ₂ −a / 2 β _R = arctan (L ₄ / L ₃ ) Here, as shown in FIG. 4A, the right end of the irradiated X-ray comes to the right of the effective field of the film F. In the case of (θ−α) <β _R , γ _R = β _R − (θ−α), and on the other hand, as shown in FIG. 4B, (θ′−α)
<In the case of beta _R is calculated by _{γ R = (θ'-α)} -β R. In addition, in the case of ((theta)-(alpha)) = (beta) _R , (gamma) _R = 0. Therefore, this γ _R is uniquely determined when θ is determined.

Based on γ _L and γ _R obtained above, the adjustment amount of the X-ray diaphragm leaves 21 and 22 is obtained. For example, as shown in FIG. 5, the adjustment amount S of the X-ray diaphragm leaf 22 can be obtained as follows. S = S ₁ −S ₂ S ₁ = D · tan α S ₂ = D · tan (α−γ _L ), where D is the length from the X-ray focal point XS to the X-ray diaphragm leaf 22, and Determined at design time. Therefore, S can be obtained from the known values D and α and γ _L obtained above. The adjustment amount of the X-ray diaphragm leaf 21 can be obtained in the same manner.

In the X-ray diaphragm adjustment amount specifying section 31, the X-ray diaphragm leaf 21,
The adjustment amount of 22 is calculated. Although FIG. 4 shows the case where the X-ray tube 1 is rotated to the right, the adjustment amount of the X-ray diaphragm leaves 21 and 22 can be obtained by the same procedure when rotated to the left. Further, the X-ray diaphragm adjustment amount specifying unit 3
1, X-ray diaphragm leaves 21 and 22 corresponding to the rotation angle θ
The adjustment amount of may be stored as a table.

Then, the X-ray diaphragm control unit 32 drives and controls the motors 21d and 22d so as to adjust the X-ray diaphragm leaves 21 and 22 by the adjustment amount calculated by the X-ray diaphragm adjustment amount specifying unit 31.

By controlling the X-ray diaphragm in this way, it is possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray imaging. In addition, in oblique angle photography, the X-ray tube 1
More X-rays will not enter the effective field of view of the film F in the direction opposite to the direction of rotation of. For example,
In FIG. 4, since the X-ray tube 1 is rotated to the right, more X-rays on the left side of the film F do not enter the effective visual field of the film F. Therefore, the X-ray diaphragm mechanism 20 may be configured to restrict X-rays on the side (on the left side in FIG. 4) from which more X-rays do not enter the effective visual field of the film F.
Even with this configuration, unnecessary X-ray irradiation can be prevented sufficiently effectively. Further, in particular, in the case as shown in FIG. 4B, the X-ray stop by the X-ray stop leaf 21 is not particularly necessary because it is incident on the right side of the film F within the effective visual field of the film F. , X-ray diaphragm leaf 2 as above
By adjusting the X-ray diaphragm according to No. 1, the entire effective visual field is irradiated with X-rays even on the right side of the film F, which is preferable.

Next, the operation during X-ray fluoroscopy will be described with reference to FIG. Even when X-ray fluoroscopy is performed, when the X-ray tube 1 is rotated to perform X-ray fluoroscopy (oblique angle perspective), as shown in FIG. The line is irradiated on the subject M. Note that FIG. 6 is drawn according to FIG. 4, and in the drawing, reference numeral IX indicates I.I. The effective visual field of the X-ray detection surface of I device 3 is shown. Also, this I.D. I device 3
The effective visual field IX of the X-ray detection surface has a length b in the Y direction.

At this time, the adjustment of the X-ray diaphragm leaves 21 and 22 can be performed in the same procedure as in the above-described oblique angle of incidence photography. That is, in FIG. 6, γ _L can be obtained as follows. L ₁ = L ₂ −b / 2 L ₂ = L · sin θ L ₅ = L ₃ + w L ₃ = L · cos θ β _L = arctan (L ₁ / L ₅ ) γ _L = (θ−α) −β _L , W are rotation centers CP and I.D. The length between the I-device 3 and the X-ray detection surface, which is determined when the device is designed. Therefore,
Once θ is determined, γ _L can be uniquely obtained.

On the other hand, γ _R can be obtained as follows. _{L 4 = L 2 -b / 2} β R = arctan (L 4 / L 5) γ R = (θ-α) -β R Therefore, Kimare theta is, gamma _R is uniquely determined.

Based on these γ _L and γ _R , the adjustment amount of the X-ray diaphragm leaves 21 and 22 can be obtained in the same manner as the procedure shown in FIG. The X-ray diaphragm adjustment amount specifying unit 31 obtains the adjustment amount of the X-ray diaphragm leaves 21 and 22 according to the rotation angle read from the setting device 16, and the X-ray diaphragm control unit 32.
Controls the motors 21d and 22d based on the adjustment amount. This makes it possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray fluoroscopy even during oblique-angle fluoroscopy.

Also in this case, as in the case of the oblique angle shooting,
More X-rays are The X-ray diaphragm mechanism 20 may be configured to restrict X-rays that do not enter the effective visual field of the X-ray detection surface of the I-device 3 (left side in FIG. 6).

Next, the configuration of the second embodiment device of the present invention will be described. In the second embodiment, the X-ray diaphragm mechanism is constructed as shown in FIG. The I-device 3 (including the television camera 4) has the same configuration as that of the first embodiment device except that the I-device 3 (including the television camera 4) is movable in the Y direction.

As shown in FIG. 7, the X-ray diaphragm mechanism of this embodiment is composed of only the X-ray diaphragm leaves 22 and 23 of the X-ray diaphragm mechanism 20 of the first embodiment. Then, when the rotation angle of the X-ray tube 1 is 0 °, the X-ray diaphragm leaf 23 narrows the X-ray so that the irradiated X-ray enters the effective visual field of the film according to the film size. Further, the X-ray diaphragm leaf 22 is configured to adjust the X-ray diaphragm amount in the Y direction on either the right or left side. In this embodiment, the X-ray diaphragm mechanism composed of the X-ray diaphragm leaves 22 and 23 corresponds to the X-ray diaphragm means in this invention, and the motors 22d and 23f serve as the X-ray diaphragm adjusting means in this invention. Equivalent to.

As shown in FIG. 8, one end of the quick-shooting device 2 is screwed onto a screw shaft 51 extending in the Y direction, and the opposite side is slidably supported by a guide shaft 52. And
The rotation of the motor 53 that rotates the screw shaft 51 moves the quick shooting device 2 in the Y direction.

In addition, I.D. The I device 3 (including the television camera 5) is also screwed at one end to the screw shaft 54 extending in the Y direction and is slidably supported on the guide shaft 55 at the opposite side, as in the X-ray radiography device 2. There is. The rotation of the motor 56 that rotates the screw shaft 54 causes the I.D. The I device 3 and the like are moved in the Y direction.

The screw shafts 51 and 54, the guide shaft 52,
The motor 55 and the motors 53 and 56 are supported by the main frame 11 of the device (not shown in FIG. 9).

The drive control of the motors 53 and 56 is performed based on the movement amount obtained by the movement amount specifying unit 57.
8 is configured to do. The procedure for identifying the movement amount in the movement amount identification unit 57 will be described later.

In addition, in the structure other than the above, the quick shooting device 2
And I. The I device 3 and the like may be configured to be movable in the Y direction.

Next, the operation of this embodiment will be described with reference to FIG. 9 by taking oblique-angle shooting as an example. In this embodiment, X that does not enter the effective visual field of the film F in the case of oblique-angle shooting X
Adjust the line either left or right. That is, the X-ray rapid copying apparatus 2 is moved to the left so that the left end of the effective field of view of the film F coincides with the left end of the irradiated X-rays.
The X-ray copying apparatus 2 is adjusted to the right by the X-ray diaphragm leaf 22 on the right side of the effective field of view (Fig. 9 (a)), or, conversely, the X-ray copying apparatus 2 is moved to the right side to move the film. The right end of the effective field of view of F is made to coincide with the right end of the irradiated X-ray, and the X-ray that does not enter on the left side of the effective field of the film F is adjusted by the X-ray diaphragm leaf 22 (FIG. 9 (b)). )).

For example, the movement amount YS of the quick shooting device 2 in the case of FIG. 9A can be obtained as follows. YS = L ₆ −L ₁ L ₆ = L ₃ tan (θ + α) However, L ₁ and L ₃ are the same as in the first embodiment (FIG. 4), and are functions with θ as a variable, and L and α Is the same as the first embodiment (FIG. 4). Therefore, YS is obtained when θ is determined.

The movement amount specifying unit 57 can obtain the movement amount of the quick-shooting photographing device 2 according to the rotation angle (θ) set by the setting device 16 as described above. The movement amount according to the rotation angle may be stored as a table.

On the other hand, γ _R can be obtained as follows. γ _R = arctan ((YS + L ₄ ) / L ₃ ) where YS is obtained by the same procedure as above, and L
_Reference numeral 4 is the same as in the first embodiment (FIG. 4), and all are functions with θ as a variable. Therefore, γ _R can be obtained if θ is determined.

In the X-ray diaphragm adjustment amount specifying unit 31, the X-ray leaf 22 is calculated based on this γ _R obtained according to the rotation angle.
It is possible to obtain the adjustment amount (the amount of diaphragm on the right side of the X-ray). The adjustment amount of the X-ray leaf 22 according to the rotation angle may be stored as a table.

Further, the quick shooting device 2 in the case of FIG. 9B.
The movement amount YS of can be obtained as follows. _{YS = L 4 -L 9 L 9} = L 3 tan (θ-α) , however, L _3, L ₄ is a function in which the theta variable. Therefore, YS is obtained when θ is determined.

On the other hand, γ _L can be obtained as follows. β _L = arctan ((L ₁ -YS) / L ₃ ) γ _L = (θ + α) -β _L where YS and L ₁ are functions with θ as a variable. Therefore, γ _L can be obtained if θ is determined.

In the movement amount specifying unit 57, the movement amount YS of the quick photographing apparatus 2 is given to the movement control unit 58, and in the X-ray diaphragm adjustment amount specifying unit 31, the adjustment amount of the X-ray leaf 22 is adjusted to the X-ray diaphragm control unit 32. Give to. The movement control unit 58 drives and controls the motor 53 to move the given movement amount, and the X-ray diaphragm control unit 32 drives and controls the motor 22d based on the adjustment amount.

When the X-ray speed photography apparatus 2 is moved to the left in the Y direction as shown in FIG. When the I device 3 or the like gets in the way, the I. The I controller 3 and the like may be driven by the movement control unit 58 to drive the motor 56 so that the I apparatus 3 and the like are moved to the left in the Y direction by the same movement amount as the X-ray radiography device 2, for example.

Further, for example, in the case as shown in FIG. 4B, when the right end of the film F and the right end of the irradiation X-ray are aligned, the following movement amount YS is moved to the left side, and The X-ray diaphragm leaf 22 may be driven at the angle γ _L according to the adjustment amount as described above.

YS = L ₉ -L ₄ β _L = arctan ((L ₁ + YS) / L ₃ ) γ _L = (θ + α) -β _L

As a result, the subject M can be prevented from being irradiated with X-rays unnecessary for X-ray imaging. Further, the configuration of the X-ray diaphragm mechanism can be simplified as compared with the first embodiment device. Since the X-ray diaphragm mechanism is provided in the collimator 7 having a relatively small shape, a simple structure is preferable. From this point of view, the apparatus of this embodiment also has the effect of simplifying the configuration of the X-ray diaphragm mechanism.

During X-ray fluoroscopy, I.I. The I.I. To prevent the subject M from being irradiated with X-rays unnecessary for X-ray fluoroscopy by moving the I-device 3 and the like in the Y-direction and controlling the X-rays to be collectively focused on the side opposite to the moving direction. You can At this time, I.D. The movement amount of the I-device 3 and the like and the adjustment amount of the X-ray diaphragm leaf 22 are uniquely determined if θ is determined.

Next, the structure of the apparatus of the third embodiment of the present invention will be described. The third embodiment apparatus has the same configuration as the second embodiment apparatus except that the X-ray diaphragm mechanism is constructed as shown in FIG.

As shown in FIG. 11, the X-ray diaphragm mechanism of this embodiment has the X-ray diaphragm mechanism of the X-ray diaphragm mechanism 20 of the first embodiment.
The linear diaphragm leaf 23 alone is used, and the X-ray diaphragm amount in the Y direction is adjusted in synchronization with the left and right.

Next, the operation of this embodiment will be described with reference to FIG. 11 by taking an example of oblique-angle shooting. In this example,
During oblique-angle shooting, the X-ray photographing device 2 is moved in the Y direction by a predetermined amount so that the X-rays that do not enter the effective field of the film F are adjusted to the same amount by the left and right leaves 23a and 23b of the X-ray diaphragm leaf 23. The irradiation X-ray was narrowed down.

Left and right leaves 23 of the X-ray diaphragm leaf 23
To make the adjustment amounts by a and 23b the same,
As shown in, the left and right adjustment angles γ _L and γ _R according to the left and right X-ray diaphragm adjustment amounts may be the same. Further, the X-ray radiography device 2 may be moved in the Y direction with the movement amount YS such that the left and right adjustment angles γ _L and γ _R corresponding to the left and right X-ray diaphragm adjustment amounts become the same.

First, the right adjustment angle γ _R can be expressed as follows. YS = L ₁₂ −L ₄ L ₁₂ = L ₃ tan (θ−α + γ _R ) YS = L ₃ tan (θ−α + γ _R ) −L ₄ (θ−α + γ _R ) = arctan ((YS + L ₄ ) / L
₃ ) γ _R = arctan ((YS + L ₄ ) / L ₃ ) −θ + α where L ₃ and L ₄ are functions of θ, and L and α are known values (note that a is a known value, the same below. ). Therefore, γ _R can be expressed as a function with YS and θ as variables. This is shown below. γ _R = f (YS, θ) ………… (1)

On the other hand, the left adjustment angle γ _L can be expressed as follows. YS = L ₁₃ −L ₆ L ₁₃ = L ₃ tan (θ + α−γ _L ) YS = L ₃ tan (θ + α−γ _L ) −L ₆ (θ + α−γ _L ) = arctan ((YS + L ₆ ) / L
₃ ) γ _L = -arctan ((YS + L ₆ ) / L ₃ ) + θ +
α However, L ₆ is a function of θ. Therefore, γ _L is Y
It can be expressed as a function with S and θ as variables. This is shown below. γ _L = g (YS, θ) ………… (2)

Since γ _R and γ _L are made the same, f (YS, θ) = g (YS, θ) is obtained from the equations (1) and (2). If θ is determined, YS is determined. It is uniquely determined.

The movement amount specifying unit 57 can obtain the movement amount according to the rotation angle (θ) as described above.
The movement amount according to the rotation angle may be stored as a table.

Further, the movement amount YS obtained as described above
By substituting in the equation (1) or equation (2), the adjustment angle γ _R of the X-ray diaphragm leaf 23 (the same value for γ _L ) can be obtained.
Therefore, the X-ray diaphragm leaf 2 based on this γ _R (γ _L )
The adjustment amount of 3 can be obtained.

The X-ray diaphragm adjustment amount specifying unit 31 can obtain the adjustment amount of the X-ray diaphragm leaf 23 according to the rotation angle (θ) as described above. Note that the adjustment amount according to the rotation angle may be stored as a table.

The movement amount specifying unit 57 gives the movement amount YS of the quick-photographing apparatus 2 to the movement control unit 58, and the X-ray diaphragm adjustment amount specifying unit 31 sets the adjustment amount of the X-ray diaphragm leaf 23 to X.
It is given to the line diaphragm control unit 32.

The movement controller 58 drives and controls the motor 53 to move the given movement amount, and also controls the I.V.
If the I device 3 and the like are in the way, the motor 56 also moves the same amount Y.
Drive with S. The X-ray diaphragm control unit 32 drives and controls the motor 23f based on the adjustment amount.

As a result, it is possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray imaging. Further, as the X-ray diaphragm mechanism, it is possible to obtain an effect that the structure thereof can be made simpler than that of the apparatus of the second embodiment.

Even when X-ray fluoroscopy is performed, as in the case of the above-mentioned X-ray photography, the I.I. The I-device 3 and the like are moved in the Y direction to move the left and right leaves 23a and 23b of the X-ray diaphragm leaf 23.
It is possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray fluoroscopy by controlling so that the X-ray diaphragm is adjusted in synchronism with each other. At this time, I.D. I
The amount of movement of the device 3 or the like and the amount of adjustment of the X-ray diaphragm leaf 23 are also uniquely obtained if the rotation angle is determined.

Next, the structure of the apparatus of the fourth embodiment of the present invention will be described. In this fourth embodiment apparatus, the X-ray diaphragm mechanism is configured as shown in FIG. 10, and the rotation center CP of the X-ray tube 1 is set.
The configuration is the same as that of the above-described first embodiment apparatus except that the device is configured to be displaced downward from the film F.

In order to allow the center of rotation CP of the X-ray tube 1 to be displaced downward from the film F, in this embodiment, as shown in FIG. Is configured to be movable in the vertical direction.

In FIG. 13, the fan-shaped rack 10 is provided with a main frame 11
The main frame 10 is slidably supported by a guide shaft (not shown) that is supported in parallel with the screw shaft 61 while being screwed into a screw shaft 61 that is rotatably supported by the main frame 10. Then, the screw shaft 61 is rotated by the rotation of the motor 62 so that the fan-shaped rack 10 can be moved in the vertical direction with respect to the main frame 11. By the movement of the fan-shaped rack 10, the rotation shaft 12, the support 6, the X-ray tube 1 and the like are moved in the vertical direction, and the center of rotation can be shifted downward from the film F, that is, from CP to CP ′. . It should be noted that the rotation center CP of the X-ray tube 1 may be displaced downward from the film F with a configuration other than the above.

The drive control of the motor 62 is performed by the movement amount specifying unit 6
The movement control unit 64 based on the movement amount obtained by
Is configured to do. The procedure for identifying the movement amount in the movement amount identification unit 63 will be described later.

Next, the operation of this embodiment will be described with reference to FIG. 13 by taking the oblique-angle shooting as an example. In this example,
During oblique angle shooting, the center of rotation is shifted downward from the film F, and X-rays that do not enter the effective field of view of the film F are irradiated with the same amount of adjustment by the left and right leaves 23a and 23b of the X-ray diaphragm leaf 23. I tried to narrow down the X-rays.

Left and right leaves 23 of the X-ray diaphragm leaf 23
In order to make the adjustment amounts by a and 23b the same,
As shown in, the left and right adjustment angles γ _L and γ _R according to the left and right X-ray diaphragm adjustment amounts may be the same. Further, the X-ray tube 1 is rotated by shifting the center of rotation downward from the film F so that the left and right adjustment angles γ _L and γ _R according to the left and right X-ray diaphragm adjustment amounts become the same. Good. However, since the X-ray tube 1 is rotated by shifting the rotation center, the incident angle of X-rays on the film F is θ, that is, the X-ray tube 1 is rotated by θ in the first to third embodiments. In order to make it the same as that of X-ray irradiation, the rotation angle must be θ ′.

An angle θ'which is rotated at the time of rotation according to the rotation angle (θ), a movement amount L'which shifts the rotation center, and adjustment angles γ _L and γ according to the left and right adjustment amounts of the X-ray diaphragm leaf 23.
The procedure for calculating _R will be described below.

First, θ'can be expressed as follows. L ₃₄ = L ₃₃ sin θ = L · sin θ ′ L ₃₃ = L ₃₂ · sec θ L ₃₂ = L ₃₁ −L ′ L ₃₁ = L · cos θ Therefore, θ ′ is a function with θ and L ′ as variables. Can be represented. This is shown below. θ ′ = f (θ, L ′) ……… (3)

On the other hand, the right adjustment angle γ _R can be expressed as follows. L ₃₄ = a / 2 + L ₃₅ L ₃₅ = L ₃₂ tan (θ′−α + γ _R ) Therefore, γ _R can be expressed as a function having θ, θ ′, and L ′ as variables. This is shown below. γ _R = g ₁ (θ, θ ', L') ……… (4)

The left adjustment angle γ _L can be expressed as follows. L ₃₆ = L ₃₄ + a / 2 L ₃₆ = L ₃₂ tan (θ ′ + α−γ _L ) Therefore, γ _L can be expressed as a function with θ, θ ′, and L ′ as variables. This is shown below. γ _L = g ₂ (θ, θ ', L') ……… (5)

Since γ _R and γ _L are made the same, g ₁ (θ, θ ′, L ′) = g ₂ (θ, θ ′, L ′) from equations (4) and (5). ) And θ ′ can be expressed as a function with θ and L ′ as variables. This is shown below. θ '= g (θ, L') ... (6)

From equations (3) and (6), f (θ, L ') = g (θ, L'), and if θ is determined, L'is determined.

Further, by substituting the L'and the (determined) θ obtained above into the equation (6), θ'can be obtained. Further, once θ, L ′ and θ ′ are determined, they are substituted into the equation (4) (or the equation (5)) to obtain γ
_R (γ _L ) can be obtained.

The rotation speed specifying unit 17 calculates the angle (θ ') according to the rotation angle (θ) as described above, and specifies the rotation speed of the motor 14 according to the calculation. Further, the movement amount specifying unit 63 specifies the movement amount L ′ according to the rotation angle (θ) as described above. Further, the X-ray diaphragm adjustment amount specifying unit 31
Then, the adjustment amount of the X-ray diaphragm leaf 23 according to the rotation angle (θ) is specified as described above. In addition, each specifying unit 17, 6
The rotation number of the motor 14, the movement amount L ′, and the adjustment amount of the X-ray diaphragm leaf 23 according to the rotation angle (θ) may be stored in tables 3 and 31 as a table.

The rotation motor drive control unit 18 drives the motor 14 at the rotation speed given from the rotation speed specifying unit 17. Further, the movement amount control unit 64 drives the motor 62 with the movement amount L ′ given from the movement amount specifying unit 63. Further, the X-ray diaphragm control unit 32 drives the motor 23f with the adjustment amount of the X-ray diaphragm leaf 23 given from the X-ray diaphragm adjustment amount specifying unit 31.

As a result, it is possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray imaging. Further, as the X-ray diaphragm mechanism, it is possible to obtain an effect that the structure can be simplified as compared with the first and second embodiment devices.

Even if the quick-shooting device 2 is configured to be movable in the vertical direction and is raised in the vertical direction by the same moving amount L'as shown in FIG.
The left and right adjustment amounts of the X-ray diaphragm leaf 23 are the same (γ _R =
γ _L ).

Also during X-ray fluoroscopy, as in the case of the above X-ray photography, the center of rotation is shifted so that the left and right adjustment angles are the same according to the left and right X-ray diaphragm adjustment amounts, and the X-ray diaphragm leaf 23 is moved. The left and right leaves 23a and 23b are synchronized with each other in the X direction.
By controlling the line diaphragm so as to be adjusted, it is possible to prevent the subject M from being irradiated with X-rays unnecessary for fluoroscopy. It should be noted that the movement amount L ′ that shifts the rotation center at this time, the rotation angle θ ′, and the adjustment amount of the X-ray diaphragm leaf 23 are uniquely obtained if the rotation angle (θ) is determined.

Next, the structure of the fifth embodiment of the present invention will be described. In the fifth embodiment, when the center of rotation CP of the X-ray tube 1 is shifted to CP ′ below the film F and rotated, the length from CP on the film F to the X-ray focal point is kept constant. The structure is the same as that of the device of the fourth embodiment except that the above structure is adopted.

That is, in this embodiment, as shown in FIG. 15, the X-ray tube 1 is configured to be movable in the vertical direction with respect to the support 6. In FIG. 15, the X-ray tube 1 is screwed onto a screw shaft 71 that is rotatably supported by the support column 6, and is slid on a guide shaft (not shown) that is supported on the support column 6 in parallel with the screw shaft 71. Supported freely. Then, the screw shaft 71 is rotated by the rotation of the motor 72, and the X-ray tube 1 is supported by the support rod 6
It is possible to move vertically with respect to. When the center of rotation CP of the X-ray tube 1 is displaced by the movement of the X-ray tube 1 to CP ′ below the film F and rotated, C on the film F is rotated.
The length from P to the X-ray focal point can be kept constant. It should be noted that a configuration other than the above, for example, the support 6 is configured to be expandable and contractable, and when the rotation center CP of the X-ray tube 1 is rotated while being shifted to CP ′ below the film F, the film F is rotated.
The length from the upper CP to the X-ray focal point may be kept constant.

The drive control of the motor 72 is performed by the movement amount specifying unit 6
The X-ray tube movement control unit 74 is configured to perform the movement based on the movement amount obtained in Step 3.

Next, the operation of this embodiment will be described with reference to FIG. 16 by taking oblique-angle shooting as an example. In this example,
X-rays that do not enter the effective field of view of the film F are obtained by shifting the center of rotation downward from the film F while keeping the length from the CP on the film F to the X-ray focal point constant during oblique-angle shooting. The left and right leaves 2 of the X-ray diaphragm leaf 23
The amount of adjustment by 3a and 23b was made the same, and the irradiation X-ray was focused.

Left and right leaves 23 of the X-ray diaphragm leaf 23
To make the adjustment amounts by a and 23b the same,
As shown in, the left and right adjustment angles γ _L and γ _R according to the left and right X-ray diaphragm adjustment amounts may be the same. Further, the X-ray tube 1 is rotated by shifting the center of rotation downward from the film F so that the left and right adjustment angles γ _L and γ _R according to the left and right X-ray diaphragm adjustment amounts become the same. Good. Further, in order to keep the length from the CP on the film F to the X-ray focal point constant, the X-ray tube 1 is moved upward with respect to the support column 6 by the amount by which the center of rotation is shifted downward from the film F. You can do it. However, also in this embodiment, since the X-ray tube 1 is rotated with the center of rotation being shifted, the X-ray to the film F is reduced.
To make the incident angle of the line θ, the rotation angle must be θ ′.

Angle θ ′ at the time of rotation according to the rotation angle (θ)
And a procedure for calculating the adjustment amounts γ _L and γ _R corresponding to the left and right adjustment amounts of the X-ray diaphragm leaf 23 and the movement amount L ′ that shifts the rotation center (the same as the upward movement amount of the X-ray tube 1). Will be described below.

L ₂₁ = L · sin θ = L ₂₀ · tan θ ′ L ₂₀ = L ₃ + L ′ = L cos θ + L ′ Therefore, θ ′ can be expressed as a function with θ and L ′ as variables. This is shown below. θ '= f (θ, L') ... (7)

On the other hand, the right adjustment angle γ _R can be expressed as follows. L ₂₁ = a / 2 + L ₂₂ L ₂₁ = L · sin θ L ₂₂ = L ₃ · tan (θ′−α + γ _R ) Therefore, γ _R can be expressed as a function with θ ′ and θ as variables. This is shown below. γ _R = g ₁ (θ ', θ) ……… (8)

The left adjustment angle γ _L can be expressed as follows. _{L 23 = L 21 + a /} 2 L 23 = L 3 · tan (θ '+ α-γ L) Thus, gamma _L is, theta' may represent a theta as function as a variable. This is shown below. γ _L = g ₂ (θ ', θ) ……… (9)

Here, since γ _R and γ _L are the same, g ₁ (θ ′, θ) = g ₂ (θ ′, θ) is obtained from the equations (8) and (9), and θ ′ is , Θ can be expressed as a function with variables. This is shown below. θ '= g (θ) ……… （10）

From equations (7) and (10), f (θ, L ') = g (θ), and if θ is determined, L'is determined.

Further, by substituting L ′ and θ (determined) obtained above into the equation (7), θ ′ can be obtained. Further, if θ and θ ′ are determined, then they are (8)
By substituting into the equation (or equation (9)), γ _R (γ
_L ) can be obtained.

The rotation speed specifying unit 17 calculates the angle (θ ') according to the rotation angle (θ) as described above, and specifies the rotation speed of the motor 14 according to the calculation. Further, the movement amount specifying unit 63 specifies the movement amount L ′ according to the rotation angle (θ) as described above. Further, the X-ray diaphragm adjustment amount specifying unit 3
In 1, the adjustment amount of the X-ray diaphragm leaf 23 according to the rotation angle (θ) is specified as described above. In addition, each specifying unit 17,
The rotation speed of the motor 14, the movement amount L ′, and the adjustment amount of the X-ray diaphragm leaf 23 according to the rotation angle (θ) may be stored in the tables 63 and 31 as a table.

The rotary motor drive control unit 18 drives the motor 14 at the rotation speed given from the rotation speed specifying unit 17. The movement control unit 64 drives the motor 62 with the movement amount L ′ given by the movement amount specifying unit 63. Further, the X-ray tube movement control unit 74 also drives the motor 72 with the movement amount L ′ given from the movement amount specifying unit 63. Then, in the X-ray diaphragm control unit 32, the X-ray diaphragm adjustment amount specifying unit 3
The motor 23f is driven by the adjustment amount of the X-ray diaphragm leaf 23 given from 1.

As a result, it is possible to prevent the subject M from being irradiated with X-rays unnecessary for X-ray imaging. Further, as the X-ray diaphragm mechanism, it is possible to obtain an effect that the structure can be simplified as compared with the first and second embodiment devices. Furthermore, the distance between the X-ray focal point and the film F can always be kept constant during oblique-angle shooting.

During X-ray fluoroscopy, as in the case of X-ray photography, the center of rotation is shifted so that the left and right adjustment angles are the same according to the left and right X-ray diaphragm adjustment amounts, and the X-ray focus is adjusted. By keeping the distance from the film F constant and controlling the left and right leaves 23a and 23b of the X-ray diaphragm leaf 23 to synchronize the X-ray diaphragm in the left-right direction, unnecessary X-rays are not covered by X-ray fluoroscopy. It is possible not to irradiate the specimen M. The amount of movement L ′ that shifts the center of rotation at this time, the angle θ ′ during rotation, and the adjustment amount of the X-ray diaphragm leaf 23 are uniquely obtained if the rotation angle (θ) is determined.

In each of the above-mentioned embodiments, the device in which the rotation center of the X-ray tube 1 is located on the film surface has been described, but the invention can be similarly applied to the device in which the rotation center is located at other positions. .

[0115]

As is apparent from the above description, according to the present invention, the X-ray detecting surface of the X-ray see-through means or the X-ray detecting means of the X-ray fluoroscopic means can be used depending on the rotation angle. Since the irradiation X-rays are narrowed down by the adjustment amount of the X-ray diaphragm that is required to make them substantially incident within the effective field of view (during X-ray fluoroscopy), the film surface can be used even in oblique-angle shooting and oblique-angle fluoroscopy. X-rays that do not enter the effective field of view or the effective field of the X-ray detection surface of the X-ray fluoroscopy means are mostly or entirely focused by the X-ray diaphragm means, and X-rays unnecessary for X-ray imaging are irradiated to the subject. Can be prevented.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of an X-ray diaphragm mechanism of the first embodiment device.

FIG. 3 is a diagram showing a configuration of a modified example of the X-ray diaphragm mechanism.

FIG. 4 is a diagram for explaining an operation at the time of oblique-angle shooting by the apparatus of the first embodiment.

FIG. 5 is a diagram for explaining a procedure for obtaining an adjustment amount of an X-ray diaphragm mechanism.

FIG. 6 is a diagram for explaining the operation of the apparatus of the first embodiment at the time of see-through oblique angle.

FIG. 7 is a diagram showing a configuration of an X-ray diaphragm mechanism of the second embodiment device.

FIG. 8 is a diagram showing a main configuration of a second embodiment device.

FIG. 9 is a diagram for explaining the operation at the time of oblique-angle shooting by the apparatus of the second embodiment.

FIG. 10 is a diagram showing a configuration of an X-ray diaphragm mechanism of a third embodiment device.

FIG. 11 is a diagram for explaining an operation at the time of oblique-angle shooting by the apparatus of the third embodiment.

FIG. 12 is a diagram showing a configuration of a fourth example device.

FIG. 13 is a diagram for explaining the operation at the time of oblique-angle shooting by the apparatus of the fourth embodiment.

FIG. 14 is a diagram for explaining an operation at the time of oblique-angle shooting according to a modification of the fourth embodiment.

FIG. 15 is a diagram showing a configuration of a fifth embodiment device.

FIG. 16 is a diagram for explaining the operation at the time of oblique-angle shooting by the device of the fifth embodiment.

FIG. 17 is a diagram showing a configuration of an X-ray diagnostic apparatus according to a conventional example.

FIG. 18 is a diagram for explaining a problem of the conventional example.

[Explanation of symbols]

1 ... X-ray tube 2 ... Quick-shooting apparatus 3 ... I. I device 4 ... Top plate 5 ... Television camera 16 ... Setting device 20 ... X-ray diaphragm mechanism 21d, 22d, 23f ... Motor for X-ray diaphragm leaf adjustment 31 ... X-ray diaphragm adjustment amount specifying means 32 ... X-ray diaphragm controller M ... Subject

Claims (1)

[Claims] 1. A top plate on which a subject is supine, an X-ray tube,
An X-ray imaging means for imaging a transmitted X-ray transmitted through a subject lying on the top plate on a film or / and an X-ray fluoroscopic means for detecting the transmitted X-ray to obtain an X-ray fluoroscopic image,
Further, the X-ray tube is configured to be rotatable about a predetermined axis (rotation center axis) parallel to an axis orthogonal to the body axis of the subject, and the subject lying on the top plate and In an X-ray diagnostic apparatus configured to be capable of irradiating X-rays from an oblique direction with respect to a film surface of the X-ray imaging means and / or an X-ray detection surface of the X-ray fluoroscopic means, irradiation from the X-ray tube is performed. X-ray diaphragm means for narrowing down the X-rays, X-ray diaphragm adjusting means for adjusting the X-ray diaphragm amount by the X-ray diaphragm means, and angle information acquisition for acquiring rotation angle information when the X-ray tube rotates. Means and the rotation angle information captured by the angle information capturing means, the X-rays emitted from the X-ray tube are effective within the effective visual field of the film surface or the X-ray detection surface of the X-ray fluoroscopic means. Obtain the adjustment amount of the X-ray diaphragm required to make the light incident substantially within the visual field And X-ray aperture adjustment amount specifying means, on the basis of the adjustment amount determined by the X-ray aperture adjustment amount specifying means,
An X-ray diagnostic apparatus comprising: an X-ray diaphragm control unit that drives and controls the X-ray diaphragm adjustment unit.