JPH09276265A - X-ray diagnostic device - Google Patents

Abstract

(57) [PROBLEMS] To improve the operability by improving the control of an X-ray diaphragm and to improve the X-ray diaphragm to surely reduce unnecessary X-ray exposure. . SOLUTION: When a rotating arm is rotated by 45 ° or more, the moving direction of each rectangular diaphragm of the rectangular diaphragm on the screen of the monitor and the guide direction of the operation box for controlling the X-ray diaphragm of the operation box coincide with each other. As described above, the rectangular blade corresponding to the operation box is switched by the switching unit, and the rectangular blade moves on the screen of the monitor even when the magnification is changed by changing the SID or the mode of the image intensifier. The speed control unit changes the moving speed of each rectangular blade based on the change of the enlargement ratio so that the speed does not change apparently, and further, the moving mechanism control unit changes the circular aperture of the X-rays focused by the square aperture. It controls to squeeze so as to circumscribe the exposure range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus for irradiating a subject with X-rays, detecting the X-rays transmitted through the subject, and imaging the internal structure of the subject.

[0002]

2. Description of the Related Art An X-ray diagnostic apparatus, as shown in FIG.
An outer peripheral surface of one end of an arc-shaped rotating arm 101 having a central angle of about 90 ° is rotatably suspended from the ceiling in a rotation direction R shown in FIG. 11 (a), and is attached to an inner peripheral surface of the other end of the rotating arm 101. A central outer peripheral surface of a C-shaped C-arm 102 (arc-shaped with a central angle of approximately 180 °) is rotatably supported (in the rotational direction S).
At both ends of the C-arm 102, an X-ray tube device 103 that irradiates the subject with X-rays and an imaging device 104 that detects the X-rays that have passed through the subject and images the internal structure of the detection site are held. ing. The rotating arm 101 is rotated by a rotating shaft (γ axis) that passes through a fixed point on the ceiling and is perpendicular to the ceiling (or the floor surface), and the C arm 102 passes through a fixed point with the rotating arm 101. A rotation shaft that is rotated by a rotation shaft (β-axis) that is orthogonal to the γ-axis, and that a fixed point with the rotation arm 101 slides in a sliding manner and is orthogonal to the γ-axis and the β-axis.
It rotates by (α-axis, not shown). The γ-axis, β-axis, and α-axis pass through the isocenter O, and the imaging region of the subject (human body) to be imaged is placed on the top plate and positioned with this isocenter as the center.

Further, the X-ray tube device 103 and the imaging device 1
04 is positioned so as to face each other across the isocenter O on the γ axis, and can move on a spherical orbit centered on the isocenter O. The X-rays pass through the γ-axis from the X-ray tube device 103, pass through the subject, and enter the imaging device 104. Here, when the turning position (γ) of the turning arm 101 is set to 0 °, as shown in FIG.
), The subject lying on the top moving in the horizontal direction (arrow P) is the X-ray tube device 103 and the imaging device 1.
It is set by moving to the focal point along a straight line connecting the focal point with respect to 04 and the substantially central portion of the C arm 102. At this time, it will be a set commonly known as "head-up". In addition, when the rotating position of the rotating arm 101 is 90 °, as shown in FIG.
As shown in (b), the subject on the top plate is the X-ray tube device 1
And the C-arm 102 between the camera 03 and the photographing device 104.
Is moved to and set at the focal position so as to be orthogonal to the straight line connecting the substantially central portions of the. At this time, the set is commonly called "horizontal insertion".

On the other hand, on the X-ray irradiation side of the X-ray tube device 103, where X-rays are emitted from the X-ray tube, as shown in FIG. 12, a photographing device 104 (II = image intensifier) is used.
) Circular diaphragm 1 that limits the X-ray exposure range in order from the side
11 and square diaphragms 112 to 115 are provided. Note that a circle 116 in FIG. 12 indicates the input surface of the image intensifier. FIG. 12 (a) is a perspective view showing how the input surface 116 of the image intensifier, the circular diaphragm 111, and the rectangular diaphragms 112 to 115 overlap with each other. FIG. 12B is a diagram showing how the input surface 116 of the image intensifier and the circular diaphragm 111 overlap with each other. FIG. 12C shows the image intensifier input surface 116 and the rectangular diaphragms 112 to 11.
It is a figure which shows how the 5 overlap. As shown in FIG. 12B, the circular diaphragm 111 is diaphragm-controlled so as to circumscribe the input surface 116 of the image intensifier. FIG.
2 (c), the square diaphragms 112 to 115 are 4
The first rectangular vane 112 and the third rectangular vane 114 are a set, and the second rectangular vane 113 and the fourth rectangular vane 115 are a set, each of which is composed of two rectangular vanes. The diaphragm control is performed so as to approach or move away from each other, and the moving direction of the first and third rectangular blades 112, 114 and the second,
The direction of movement of the fourth rectangular blades 113 and 115 is orthogonal.

Further, as shown in FIG. 13, on the X-ray irradiation side of the X-ray tube device 103 where X-rays are emitted from the X-ray tube,
Compensation filters 121 to prevent X-ray halation and the like
123 is provided. The first compensation filter 121 and the second compensation filter 122 have a shape that matches the shape of the subject (observation site) and approach (movement in the direction in which the amount of insertion into the X-ray image increases) or The first compensation filter 121 and the second compensation filter 122 are controlled so that they can be separated from each other (movement in the direction in which the amount of insertion into the X-ray image decreases). It is configured to rotate. Third compensation filter 1
Similarly to the first compensation filter 121 and the second compensation filter 122, the reference numeral 23 can rotate, approach, and separate, and can be moved horizontally in accordance with the X-ray irradiation method. There is.

Although not shown, such an X-ray diagnostic apparatus has a monitor for displaying an X-ray transmission image photographed by the X-ray photographing apparatus, an operation for controlling the rotation of the rotating arms 111 and 112, and a rectangular shape. An operation box for performing operations for controlling the diaphragms 112 to 115 and the compensation filters 121 to 123 is provided. For example, square diaphragms 112 to 115
As shown in FIG. 14, the operation switch for controlling the first and third rectangular blades 112 and 114 separates (opens) when tilted upward, and the first and third square blades when tilted downward as shown in FIG. The square blades 112, 114 approach (close), and if tilted to the right, the second and fourth square blades 113, 115 separate (open),
If it is tilted to the left, the second and fourth rectangular blades 113 and 115 come close (close). Note that the compensation filters 121 to 123 also have operation switches for performing similar movement operations and have a similar mechanism.

When the turning position of the turning arm 101 is 0 ° "heading", the upper diaphragm image 131 is the projected image of the first rectangular blade 112 in the image on the monitor screen shown in FIG. , The diaphragm image 132 on the right is the second rectangular blade 1.
13 is a projection image by the lower aperture image 133 is the third
Is a projected image by the rectangular blade 114, and the diaphragm image 134 on the left is a projected image by the fourth rectangular blade 115. In this case, similar to the operation guide display on the operation box, if the operation switch is tilted upward, the vertical iris images will open apart on the monitor, and if the operation switch is tilted right, it will be left and right on the monitor. Aperture images in both directions open apart, and if the operation switch is tilted downwards, the vertical aperture image approaches and closes on the monitor as well, and if the operation switch is tilted leftward, horizontal aperture images are displayed on the monitor as well. Will approach and close.

However, the turning position of the turning arm 101 is 9
In the case of “horizontal insertion” at 0 °, in the image on the monitor screen shown in FIG. 15, the upper diaphragm image 131 is a projected image by the fourth rectangular blade 115, and the right diaphragm image 132 is the first rectangular image. It is a projected image of the blade 112, and the lower diaphragm image 1
33 is a projection image by the second rectangular blade 113, and the left diaphragm image 134 is a projection image by the third rectangular blade 114. In this case, unlike the operation guide display on the operation box, if the operation switch is tilted upward, the left and right diaphragm images will open apart on the monitor, and if the operation switch is tilted right, it will be displayed on the monitor. If the vertical aperture image is separated and opened, and the operation switch is tilted downward, the horizontal aperture image is closed close on the monitor, and if the operation switch is tilted left, the vertical aperture image is tilted on the monitor. The images approach and close.

[0009]

As described above, in the conventional X-ray diagnostic apparatus, when the turning position of the turning arm 101 is "horizontal insertion" of 90 °, a rectangular diaphragm and an operation switch of the operation box are used. In the movement operation of the compensation filter, there is a problem that movement control different from the guidance display of the movement direction in the operation box is performed. As a method for solving this problem, a square diaphragm and a compensating filter are also used so that the position of each projected image on the monitor is fixed.
Although there is a method of providing a mechanism that rotates 0 ° (for example, Japanese Patent Application No. 5-334388), there are cases where such a rotation mechanism cannot be provided due to the mechanical freedom and margin of the device.

Further, in the conventional X-ray diagnostic apparatus, since the moving speed of each of the rectangular blades 112 to 115 is controlled at a preset speed, the change of the SID and the enlargement mode of the image intensifier are performed on the monitor. There is a problem that the moving speed of each of the rectangular blades 112 to 115 changes and it becomes difficult to operate. Further, in the conventional X-ray diagnostic apparatus, when the X-ray irradiation range is narrowed by the rectangular diaphragms 112 to 115, as shown in FIG. 16, the portions of the rectangular blades 112 to 115 inside the circular diaphragm 111 ( ) 141
, Only the rectangular blades 112 to 115 shield X-rays. The square diaphragms 112 to 115 slightly transmit X-rays due to transmission and diffraction. If this small amount of X-rays can be shielded more reliably, it is expected that unnecessary X-ray exposure to the subject can be reduced and the burden on the subject can be reduced.

Therefore, an object of the present invention is to provide an X-ray diagnostic apparatus capable of improving operability by improving control of the X-ray diaphragm. Further, it is another object of the present invention to provide an X-ray diagnostic apparatus capable of reliably reducing unnecessary X-ray exposure by improving the X-ray diaphragm and reducing the burden on the subject. .

[0012]

The invention corresponding to claim 1 is:
The X-ray source that radiates X-rays toward the subject placed on the top and the exposure range of X-rays radiated from the X-ray source are limited, and the X-ray sources move in different directions. At least 2 possible
X-ray diaphragm and X for capturing an X-ray image transmitted through the subject
A line image capturing unit, an arm that supports the X-ray source and the X-ray image capturing unit in opposition to each other, an arm holding unit that rotatably holds the arm, and an image captured by the X-ray image capturing unit are displayed. A display means, an operating means for instructing the movement of the X-ray diaphragm, and an X-ray diaphragm that moves based on an input to the operating means, and that moves according to the rotation angle of the arm. X-ray diaphragm driving means for switching between. The invention according to claim 2 is different from the invention according to claim 1 in that the distribution of X-rays emitted from the X-ray source is changed, and at least two movable in different directions.
One compensation filter, operating means for instructing the moving direction of the compensating filter, and a compensating filter for moving the compensating filter based on an input to the operating means. Compensation filter driving means for switching. The invention according to claim 3 is the invention according to any one of claims 1 and 2, wherein the X-ray diaphragm drive means inputs the moving direction of the X-ray diaphragm displayed on the display means to the operation means. The moving X-ray diaphragm is switched so as to match the moving direction, and the compensating filter driving means matches the moving direction of the compensating filter displayed on the display means with the moving direction input to the operating means. The moving compensation filter is switched.

The invention according to claim 4 limits the X-ray source for irradiating the subject placed on the top plate with X-rays and the exposure range of the X-rays emitted from the X-ray source. X-ray diaphragm, an X-ray image capturing means for capturing an X-ray image transmitted through the subject, a display means for displaying an image captured by the X-ray image capturing means, and an instruction to move the X-ray diaphragm. Of operating means, means for changing the magnification of the X-ray image displayed on the display means, and means for moving the X-ray diaphragm based on the input to the operating means, and the X-ray diaphragm based on the magnification. To switch the moving speed of X
And a line diaphragm drive means. The invention according to claim 5 is the invention according to claim 4, further comprising: a compensating filter for changing a distribution of X-rays emitted from the X-ray source, an operating means for instructing movement of the compensating filter, and an operating means. And a compensation filter driving means for switching the movement speed of the compensation filter based on the enlargement ratio. According to a sixth aspect of the invention, in the invention according to any one of the fourth and fifth aspects, the X-ray diaphragm driving means reduces the moving speed of the X-ray diaphragm with an increase in the enlargement ratio. The moving speed of the X-ray diaphragm on the display means is made substantially constant, and the compensating filter driving means decreases the moving speed of the compensating filter with the increase of the enlargement ratio, thereby compensating filter on the displaying means. The moving speed of is substantially constant.

According to a seventh aspect of the present invention, in an X-ray diagnostic apparatus for irradiating a subject with X-rays, detecting the X-rays transmitted through the subject, and imaging the internal structure of the subject. A square diaphragm composed of a plurality of rectangular blades that limits the radiation exposure range of the X-ray and a circular diaphragm that limits the radiation range of the X-ray to a substantially circular shape are provided so as to circumscribe the imaging area to be imaged. The X-ray irradiation range of the rectangular diaphragm is controlled, and the X-ray irradiation range of the circular diaphragm is controlled so as to circumscribe the X-ray irradiation area of the rectangular diaphragm by this control. The invention according to claim 8 is the invention according to any one of claims 1 to 6, wherein the X-ray diaphragm is a rectangular diaphragm composed of a plurality of rectangular blades for limiting an X-ray exposure range. And a circular diaphragm that limits the X-ray exposure range to a substantially circular shape, and uses a square diaphragm to circumscribe the X-ray so as to circumscribe the imaging region to be imaged.
The radiation range of the X-ray is controlled by controlling the radiation range of the line and circumscribing the radiation range of the rectangular diaphragm by this control.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an X to which the present invention is applied.
It is a block diagram showing the important section composition of a line diagnostic device. This X-ray diagnostic apparatus includes a diaphragm device 1, a holding device 2, an image processing device 3, and an X-ray generator 4. The diaphragm device 1, as shown in FIG.
Circular diaphragm 12, compensation filter 13, diaphragm control unit 14
Further, the aperture control unit 14 is provided with a speed control unit 15 and a switch switching control unit 16. As shown in FIG. 3, the holding device 2 includes a rotating arm 21.
, C arm 22, and rotation arm / C arm control unit 23
And an operation box 24.

As shown in FIG. 4, the image processing device 3 includes a photographing device 31, an image processing controller 32, and a monitor 3.
And 3. The X-ray generator 4 is shown in FIG.
As shown in FIG. 3, it is composed of an X-ray tube 41 and an X-ray tube controller 42. The diaphragm control unit 14 is connected to the rotary arm / C arm control unit 23.
The arm controller 23 and the image processing controller 32 are connected to each other, and the image processing controller 32 is connected to an X-ray tube controller 42.

The X-ray tube 41 generates X-rays when a high voltage current controlled by the X-ray tube controller 42 is supplied, and irradiates the X-rays to the imaged region of the subject located at the isocenter. To do. The X-ray exposure surface side of the X-ray tube 41 has the X
The compensation filter 13 for preventing line halation,
The circular diaphragm 12, which circumscribes the outer periphery of the input surface of the image intensifier that constitutes the imaging device 31 and limits the X-ray irradiation range to a substantially circular shape, is composed of four rectangular blades, and the X-ray irradiation range The rectangular diaphragm 11 that limits the shape of the rectangular diaphragm to a substantially quadrangular shape is arranged. The compensation filter 13, the circular diaphragm 12, and the rectangular diaphragm 11 are the diaphragm control unit 1.
The movement is controlled by 4. The speed control unit 15 controls the rectangular diaphragm 11 on the monitor 33,
In order to prevent the moving speed of the compensation filter 13 from apparently changing in the enlargement mode or the like, the actual rectangular diaphragm 11,
The moving speed of the compensation filter 13 is controlled. The switch switching control unit 16 controls the operation direction of the operation box 24 of the holding device 2 and the rectangular diaphragm 11 and the compensation filter 13 on the monitor 33 regardless of "head insertion", "lateral insertion", and the like. The movement control of the rectangular diaphragm 11 and the compensation filter 13 is switched so that the movement directions of the above are always matched.

The X-ray tube 41 and the imaging device 31 are
As described in the conventional technique, the C-arm 22 is arranged so as to face both ends of the C-arm 22 on the γ-axis. The C arm 22 is rotatably and slidably connected to one end of the rotary arm 21 rotatably suspended on the ceiling. That is, this X-ray diagnostic apparatus includes a triaxial holding device. The rotating arm 21 and the C arm 22
Are controlled by the rotating arm / C-arm control unit 23, and the operation box 24 is connected to the rotating arm / C-arm control unit 23. Although not shown, the operation box 24 includes the X-ray tube 41, the rotating arm 31, the C arm 32, and the rectangular diaphragm 1.
1, switches for operating the compensation filter 13 and the like and switches for operating SID (= source image distance) setting operation and image intensifier enlargement mode (use size mode).

The X-rays from the X-ray tube 41 pass on the γ axis and are exposed to the imaged region of the subject located at the isocenter, and the X-ray image transmitted through this imaged region is taken by the image capturing apparatus 3 as described above.
Taken by 1. The image capturing device 31 includes, for example, an image intensifier that detects X-rays that have passed through a subject and converts an X-ray image into an optical image, and a TV camera that captures an optical image of the image intensifier. It The image signal (or image data) output from the photographing device 31 is processed by the image processing control unit 32 and displayed on the monitor 33 as an image.

In this embodiment having such a configuration, the following settings are made in the case of "heading" in which the angle of the rotating arm 21 is 0 °. That is, the circular diaphragm 12
Is controlled so as to be circumscribed on the input surface of the image intensifier of the photographing device 31, and the square diaphragm 11 is operated with respect to the vertical operation of the operation box as described in the related art (see FIG. 14). The first and third rectangular blades correspond to each other, and the second and fourth rectangular blades correspond to the operation of the operation box 24 in the left-right direction, and their movements are controlled. Regarding the moving speeds of the four rectangular blades of the rectangular diaphragm 11 and the compensation filter 13, the initial values of the SID (= source image distance) and the initial value corresponding to the initial enlargement mode of the image intensifier are respectively set. It is set.

FIG. 6 is a diagram showing the flow of the aperture control process performed by the aperture control unit 14, and the rectangular aperture 11 and the like are controlled based on the flow of the aperture control process. First, step 1
As the process of (ST1), the angle of the rotating arm 21 operated by the operation box 24 is taken in, and the step 2 (S
The absolute value of this captured angle is 45
° Determine whether or not Here, if it is determined that the angle of the rotating arm 21 is 45 ° or more, as a process of step 3 (ST3), the switching unit 14 causes the operation box 2 to operate.
The setting of the four rectangular blades forming the rectangular diaphragm 11 corresponding to the operating direction of the operation box 24 for adjusting the diaphragm of the rectangular diaphragm 11 of 4 is changed according to the angle of the rotating arm 21.

For example, when the angle γ of the rotating arm 21 is 0 °, the first, second, third, and fourth rectangular blades are provided on the monitor 33 for the upper, right, lower, and left sides, respectively. Correspondingly, the first and third rectangular blades are controlled to move according to the vertical movement operation of the operation box 24, and the second and fourth rectangular blades are controlled to move according to the horizontal movement operation. When the angle γ of the rotating arm 21 is 90 ° (or −90 °), the upper, right, lower, and left on the monitor 33 are respectively
The fourth, first, second, and third rectangular blades correspond to each other, and by changing the setting by the switch switching control unit 16 of the operation box 24, the fourth, according to the vertical movement operation of the operation box 24,
The movement of the second rectangular blade is controlled, and the movement of the first and third rectangular blades is controlled according to the horizontal movement operation.

Therefore, the angle of the rotating arm 21 is 45 ° or more (45 ° or more and less than 135 °, greater than -135 °-
45 ° or less), the upper and lower groups and the left and right groups appear to be interchanged in the arrangement of the four rectangular blades of the image on the screen of the monitor 33. For up and down operation of the
The upper and lower sets of rectangular blades on the screen of No. 3 are correspondingly controlled to move, and the left and right sets of rectangular blades on the screen of the monitor 33 are correspondingly controlled to move in the horizontal direction.

In the processing of step 2, the angle of the rotating arm 21 taken in is less than 45 ° (0 ° or more and less than 45 °, 135 °
Greater than ° and less than 180 °, more than -180 ° and -135 °
Hereinafter, when it is determined that the angle is greater than −45 ° and 0 ° or less) or the setting change of the four rectangular blades of the rectangular diaphragm 11 corresponding to the operation box 24 of the operation box 24 is completed as the processing of step 3, step 4 ( As a process of ST4), it is determined whether or not the enlargement ratio is changed depending on the enlargement mode of the SID or the image intensifier of the photographing device 31. Here, if it is determined that the enlargement ratio has not changed,
As a process of step 5 (ST5), the operation box 24
It is determined whether or not the operation is performed. If it is determined that the operation box 24 has not been operated, the above step 4 is performed again.
Is returned to the process.

If it is determined in the above-mentioned step 4 that there is a change in the enlargement ratio, the enlargement ratio is taken in as the processing in step 6 (ST6) and step 7 (ST7).
), The moving speeds of the rectangular diaphragm 11 and the compensation filter 13 are calculated based on the captured enlargement ratio,
Change the setting according to the calculated moving speed. For example, in FIG.
a) and FIG. 7 (b), SID (distance) is set to L
When changing from 1 to L2 and the moving speed at L1 is V1, when L2, the moving speed V2 at which the apparent moving speed does not change on the screen of the monitor 33 is V2 = (L2 / L1). It can be calculated by V1. Further, as shown in FIGS. 8A and 8B, the enlargement mode (diameter size mode) of the image intensifier of the photographing device 31 is set to S.
If the moving speed at S1 is changed to V1 when changing from 1 to S2, the moving speed V2 at which the apparent moving speed does not change on the screen of the monitor 33 at S2 is V2 = (S2 / S1). It can be calculated by V1.

For example, if the SID is changed to 1/2,
The actual moving speed of the square blade is 1/2. Similarly, when the enlargement mode of the image intensifier is changed to 1/2, the actual moving speed of the rectangular blade becomes 1/2. The moving speed calculated in this manner is used as the square diaphragm 11
As the moving speed of each rectangular blade of the
Set as the moving speed of. Further, when it is determined that the operation box 24 is operated in the process of step 5 described above,
As the processing of step 8 (ST8), the operation box 24
Based on the operation of, the speed control unit 15 is controlled to move the rectangular blades of the rectangular diaphragm 11 at the set moving speed, and the process returns to step 5 again. .

Next, as the processing of step 9 (ST9), the exposure range of the X-rays narrowed down by the rectangular diaphragm 11 is determined based on the moving amount or the moving position of each rectangular blade moved in the processing of step 8. The diaphragm control unit 14 controls to move the circular diaphragm 12 so as to be circumscribed, and the process returns to the above-described step 4 again. For example, as shown in FIG. 9, this exposure range 51 corresponds to the X-ray exposure range 21 at the center of the rectangular diaphragm 11 shown by the dotted line.
The circular diaphragm 12 is controlled so as to be circumscribed by the input aperture 52 of the image intensifier of the photographing device 31 so as to be circumscribed.

As described above, according to this embodiment, the rotating arm 21 is moved to 45 ° (45 ° to 135 °, -45 ° to-).
135 °) or more, so that the moving direction of each square diaphragm of the square diaphragm 11 on the screen of the monitor 33 and the guide direction of the operation box 24 for controlling the X-ray diaphragm of the operation box 24 coincide with each other. The switch switching control unit 16 switches the rectangular blade corresponding to the operation box 24, and S
Based on the change of the enlargement ratio, the moving speed of the rectangular blade on the screen of the monitor 33 does not seem to change even if the enlargement ratio is changed by changing the ID or changing the mode of the image intensifier. The speed control unit 15 changes the moving speed of each square blade, and the diaphragm control unit 14 further controls the circular diaphragm so as to circumscribe the X-ray irradiation range narrowed by the rectangular diaphragm. Three
The operability on the screen of No. 3 does not change, and the square iris 11 can be controlled by the operation box 24 of the operation box 24 with constant operability that always has the same operation direction and a constant moving speed. Unnecessary X-ray exposure can be reduced more reliably.

As described above, it is possible to improve the operability and reduce the burden on the subject. Although the X-ray diaphragm 12 has been described in this embodiment, the compensating filter 13 can monitor the monitor 33 even if the rotating arm 21 rotates.
It is also possible to mechanically rotate the compensation filter 13 so that the moving direction of the compensation filter 13 on the screen and the guide direction of the operation box 24 for operating the compensation filter 13 coincide with each other, or the X-ray diaphragm. Similar to 12, when the rotating arm 21 is rotated by 45 ° or more, the movement direction of the compensation filter 13 on the screen of the monitor 33 and the guide direction of the operation box 24 for controlling the compensation filter 13 are aligned with each other. The compensation filter corresponding to the operation box 24 may be switched. Even when the enlargement ratio is changed by changing the SID or changing the mode of the image intensifier, the compensating filter 13 can be used similarly to the X-ray diaphragm 12.
The actual moving speed may be changed based on the change of the enlargement ratio so that the moving speed of the compensation filter 13 on the screen of the monitor 33 does not seem to change.

In this embodiment, the X-ray diagnostic apparatus including the compensation filter 13, the circular diaphragm 12, and the rectangular diaphragm 11 composed of four rectangular blades has been described, but the present invention is not limited to this. However, various modifications can be made without departing from the scope of the present invention. For example, the present invention can be applied to an X-ray diagnostic apparatus provided with only the square diaphragm 11 without the compensating filter 13 and the circular diaphragm 12, and regarding the square diaphragm, two, three, five, It is also possible to use six blades ...

[0031]

As described in detail above, according to the present invention,
To control the movement of the X-ray diaphragm or compensation filter so that the guide direction of the movement of the X-ray diaphragm or compensation filter and the moving direction of the X-ray diaphragm or compensation filter on the monitor screen by the operation coincide with each other. This further prevents the moving speed of the X-ray diaphragm or the compensating filter on the screen of the monitor 33 from apparently changing.
By controlling the moving speed of the X-ray diaphragm or the compensation filter according to the enlargement ratio of the intensifier in the enlargement mode, the operator can always operate the X-ray diaphragm or the compensation filter with the same operation feeling. It is possible to provide an X-ray diagnostic apparatus capable of improving the property. Further, by controlling the circular diaphragm of the X-ray diaphragm so as to circumscribe the X-ray exposure range of the rectangular diaphragm, the X-rays transmitted or diffracted by the rectangular diaphragm can be further shielded, which is more reliable and unnecessary. It is possible to provide an X-ray diagnostic apparatus that can reduce the burden on a subject by reducing X-ray exposure.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a diaphragm device of the X-ray diagnostic apparatus according to the same embodiment.

FIG. 3 is a block diagram showing a holding device of the X-ray diagnostic apparatus according to the same embodiment.

FIG. 4 is a block diagram showing an image processing apparatus of the X-ray diagnostic apparatus according to the same embodiment.

FIG. 5 is a block diagram showing an X-ray generator of the X-ray diagnostic apparatus according to the same embodiment.

FIG. 6 is a diagram showing a flow of aperture control processing performed by an aperture control unit of the X-ray diagnostic apparatus according to the same embodiment.

FIG. 7 is a view for explaining change of SID in the X-ray diagnostic apparatus according to the same embodiment.

FIG. 8 is a diagram for explaining a change of the enlargement mode of the image intensifier in the X-ray diagnostic apparatus according to the same embodiment.

FIG. 9 is a diagram showing a positional relationship between a circular diaphragm and an X-ray exposure range in the X-ray diagnostic apparatus according to the same embodiment.

FIG. 10 is a perspective view showing a gantry unit of the X-ray diagnostic apparatus.

FIG. 11 is a schematic diagram for explaining the rotating directions of the rotating arm and the C arm in the X-ray diagnostic apparatus, and the horizontal insertion.

FIG. 12 is a diagram showing a positional relationship among an input surface of an image intensifier, a circular diaphragm, and a rectangular diaphragm in a conventional X-ray diagnostic apparatus.

FIG. 13 is a diagram showing a positional relationship between an input surface of an image intensifier and a compensation filter in an X-ray diagnostic apparatus.

FIG. 14 is a diagram showing operation guidance of an operation box 24 that controls a rectangular diaphragm in an X-ray diagnostic apparatus.

FIG. 15 is a diagram showing a position of a rectangular diaphragm on a screen of a monitor in the X-ray diagnostic apparatus.

FIG. 16 is a diagram showing a positional relationship between a circular diaphragm and an actual X-ray exposure range in a conventional X-ray diagnostic apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Central control part, 4 ... Pivoting arm, 9 ... Monitor, 10 ... Compensation filter, 11 ... Circular diaphragm, 12 ... Square diaphragm, 13 ... Moving mechanism control part, 13-1 ... Speed control part, 14 ... Switching unit , 15 ... Operation box 24.

Claims (8)

[Claims] 1. An X-ray source that emits X-rays toward a subject placed on a top plate, and an exposure range of X-rays emitted from the X-ray source is limited. At least 2 movable along different directions
X-ray diaphragms, X-ray image capturing means for capturing an X-ray image transmitted through the subject, an arm for supporting the X-ray source and the X-ray image capturing means facing each other, and rotating the arm. Arm holding means for holding the X-ray image capturing means, display means for displaying an image captured by the X-ray image capturing means, operation means for instructing the movement of the X-ray diaphragm, and an input to the operation means. And an X-ray diaphragm driving means for switching the X-ray diaphragm that moves according to the rotation angle of the arm. 2. At least two compensating filters for changing the distribution of X-rays emitted from the X-ray source, which are movable along different directions, and for indicating a moving direction of the compensating filter. An operating means and a compensating filter driving means for moving the compensating filter based on an input to the operating means and switching a compensating filter that moves according to a rotation angle of the arm. The X-ray diagnostic apparatus according to claim 1. 3. The X-ray diaphragm driving means switches the moving X-ray diaphragm so that the moving direction of the X-ray diaphragm displayed on the display means coincides with the moving direction input to the operating means. The compensation filter driving means switches the moving compensation filter so that the movement direction of the compensation filter displayed on the display means coincides with the movement direction input to the operating means. Claim 1 and Claim 2
The X-ray diagnostic apparatus according to claim 1. 4. An X-ray source that irradiates an object placed on a top plate with X-rays, and X that limits an irradiation range of X-rays emitted from the X-ray source.
A line diaphragm, an X-ray image capturing means for capturing an X-ray image transmitted through the subject, a display means for displaying an image captured by the X-ray image capturing means, and an instruction to move the X-ray diaphragm. Operating means for changing the magnification of the X-ray image displayed on the display means, and moving the X-ray diaphragm based on an input to the operating means. An X-ray diagnostic apparatus comprising: an X-ray diaphragm drive means for switching the moving speed of the X-ray diaphragm based on the above. 5. A compensation filter for changing the distribution of X-rays emitted from the X-ray source, an operating means for instructing the movement of the compensation filter, and the compensation filter based on an input to the operating means. 5. The X-ray diagnostic apparatus according to claim 4, further comprising: a compensation filter driving unit that switches the moving speed of the compensation filter based on the enlargement ratio. 6. The X-ray diaphragm driving means reduces the moving speed of the X-ray diaphragm as the enlargement ratio increases so that the moving speed of the X-ray diaphragm on the display means becomes substantially constant. The compensation filter driving means reduces the movement speed of the compensation filter with the increase of the enlargement ratio to make the movement speed of the compensation filter on the display means substantially constant. The X-ray diagnostic apparatus according to any one of claims 4 and 5. 7. An X-ray diagnostic apparatus for exposing X-rays to a subject, detecting the X-rays transmitted through the subject, and imaging the internal structure of the subject, A square diaphragm composed of a plurality of rectangular blades for limiting the X-rays and a circular diaphragm for limiting the X-ray exposure range to a substantially circular shape are provided, and the X-rays by the square diaphragm are circumscribed so as to circumscribe the imaging region to be imaged. An X-ray diagnostic apparatus which controls an X-ray exposure range by controlling the X-ray exposure range of the circular diaphragm so as to circumscribe the X-ray exposure area of the rectangular diaphragm by this control. 8. The X-ray diaphragm comprises a rectangular diaphragm composed of a plurality of rectangular blades for limiting the X-ray exposure range, and a circular diaphragm for limiting the X-ray exposure range in a substantially circular shape. The irradiation range of X-rays by the rectangular diaphragm is controlled so as to circumscribe the imaging area to be imaged, and the X-ray exposure by the circular diaphragm is circumscribed by the control so as to circumscribe the irradiation area of the rectangular diaphragm. The X-ray diagnostic apparatus according to any one of claims 1 to 6, which controls an irradiation range.