JP3993588B2 - X-ray diagnostic equipment - Google Patents

Description

  The present invention relates to an X-ray diagnostic apparatus that exposes X-rays to a subject, detects X-rays transmitted through the subject, and images the internal structure of the subject.

  As shown in FIG. 10, the X-ray diagnostic apparatus suspends the outer peripheral surface of one end of an arc-shaped turning arm 101 having a central angle of approximately 90 ° from the ceiling so as to be rotatable in the rotation direction R shown in FIG. The central outer peripheral surface of the C-arm 102 having a C shape (an arc shape with a central angle of about 180 °) is pivotally supported on the inner peripheral surface of the other end of the rotating arm 101 (in the rotation direction S). At both ends of the C-arm 102, an X-ray tube device 103 that exposes the X-ray to the subject and an imaging device 104 that detects the X-ray transmitted through the subject and images the internal structure of the detection site are held. ing.

  The rotating arm 101 is rotated by a rotation axis (γ axis) that passes through a fixed point of the ceiling and is perpendicular to the ceiling (or floor surface), and the C arm 102 passes through a fixed point with the rotating arm 101. The rotating shaft (β axis) orthogonal to the γ axis is rotated, and the fixed point with the rotating arm 101 is slid in a sliding manner so that the rotating shaft is orthogonal to the γ axis and β axis ( It is rotated by the α axis (not shown). Note that the γ-axis, β-axis, and α-axis pass through the isocenter O, and the imaging region of the subject (human body) as the imaging object is placed on the top plate and positioned around the isocenter.

  Further, the X-ray tube apparatus 103 and the imaging apparatus 104 are positioned to face each other across the isocenter O on the γ-axis, and can move on a spherical track centering on the isocenter O, respectively. X-rays pass through the γ-axis from the X-ray tube apparatus 103 and the subject, and enter the imaging apparatus 104.

  Here, when the rotation position (γ) of the rotation arm 101 is set to 0 °, as shown in FIG. 11A, the subject lying on the top plate moving in the horizontal direction (arrow P) is , The focal point between the X-ray tube device 103 and the imaging device 104 and the straight line connecting the substantially central part of the C arm 102 are moved to the focal point and set. At this time, the set is commonly called “heading”.

  When the rotation position of the rotation arm 101 is 90 °, as shown in FIG. 11B, the subject on the top plate has a focal point between the X-ray tube apparatus 103 and the imaging apparatus 104, and It is set by moving to its focal position so as to be orthogonal to a straight line connecting the substantially central part of the C-arm 102. At this time, the set is commonly called “horizontal insertion”.

  On the other hand, as shown in FIG. 12, the X-ray exposure side of the X-ray tube apparatus 103 where X-rays are emitted is from the imaging apparatus 104 (II = image intensifier) side. In order, a circular diaphragm 111 and rectangular diaphragms 112 to 115 that limit the X-ray exposure range are provided. Note that reference numeral 116 in FIG. 12 denotes an input surface of the image intensifier.

  FIG. 12A 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. FIG. 12B is a diagram showing how the input surface 116 of the image intensifier and the circular aperture 111 overlap. FIG. 12C is a diagram illustrating how the input surface 116 of the image intensifier and the rectangular apertures 112 to 115 overlap.

  As shown in FIG. 12B, the circular diaphragm 111 is controlled so as to circumscribe the input surface 116 of the image intensifier. As shown in FIG. 12 (c), the rectangular diaphragms 112 to 115 are composed of four rectangular blades, and the first rectangular blade 112 and the third rectangular blade 114 are a set, and the second The rectangular blades 113 and the fourth rectangular blades 115 form a pair and are controlled so as to approach or separate from each other. The moving directions of the first and third rectangular blades 112 and 114 and the second and fourth squares are controlled. The moving direction of the blades 113 and 115 is orthogonal.

  Furthermore, as shown in FIG. 13, compensation filters 121 to 123 for preventing X-ray halation and the like are provided on the X-ray exposure side where X-rays are irradiated from the X-ray tube of the X-ray tube apparatus 103. ing.

  The first compensation filter 121 and the second compensation filter 122 have shapes that match the shape of the subject (observation site), and approach each other (movement in a 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 around the X-ray exposure direction, respectively, so as to be separated (moving in a direction in which the amount of insertion into the X-ray image decreases). It is configured to be able to rotate. The third compensation filter 123 can perform rotation, approach, and separation operations similarly to the first compensation filter 121 and the second compensation filter 122, and can move horizontally along the X-ray exposure method. It is configured as follows.

  In such an X-ray diagnostic apparatus, although not shown, a monitor that displays an X-ray transmission image captured by the X-ray imaging apparatus, an operation for controlling the rotation of the rotation arm 111 and the arm 112, and a rectangular diaphragm 112- 115 and an operation box for performing an operation for controlling the compensation filters 121 to 123 are provided.

  For example, as shown in FIG. 14, when the operation switches for controlling the rectangular diaphragms 112 to 115 are tilted upward, the first and third square blades 112 and 114 are separated (open), and are tilted downward. When the first and third square blades 112 and 114 approach (close) and are tilted to the right, the second and fourth square blades 113 and 115 are separated (open), and when the first and third square blades 112 and 114 are tilted to the left, the second and second The fourth rectangular blades 113 and 115 are close (closed). The compensation filters 121 to 123 also have operation switches for performing similar movement operations and have the same mechanism.

  When the pivot position of the pivot arm 101 is “heading” at 0 °, in the image on the monitor screen shown in FIG. 15, the upper aperture image 131 is a projection image of the first square blade 112, and the right part The aperture image 132 is a projection image by the second square blade 113, the lower aperture image 133 is a projection image by the third square blade 114, and the left aperture image 134 is a projection image by the fourth square blade 115. It is an image.

  In this case, as with the operation guidance display on the operation box, if the operation switch is tilted upward, the aperture image in the vertical direction is opened apart on the monitor, and if the operation switch is tilted right, The aperture image in the direction is opened apart, and if the operation switch is tilted downward, the aperture image in the vertical direction is also closed on the monitor and closed, and if the operation switch is tilted to the left, the aperture image in the horizontal direction is also displayed on the monitor. Approaches and closes.

  However, when the rotation position of the rotation arm 101 is “horizontal insertion” of 90 °, the upper aperture image 131 is a projection image by the fourth rectangular blade 115 in the image on the monitor screen shown in FIG. The right aperture image 132 is a projection image of the first square blade 112, the lower aperture image 133 is a projection image of the second square blade 113, and the left aperture image 134 is the third square blade 114. Is a projected image.

  In this case, unlike the operation guidance display on the operation box, if the operation switch is tilted upward, the left and right aperture images are separated and opened on the monitor, and if the operation switch is tilted to the right, If the aperture image in the vertical direction opens and closes and the operation switch is tilted downward, the aperture image in the horizontal direction approaches and closes on the monitor, and if the operation switch is tilted to the left, the aperture in the vertical direction is displayed on the monitor. The image approaches and closes.

  As described above, in the conventional X-ray diagnostic apparatus, when the rotation position of the rotation arm 101 is “horizontal insertion” of 90 °, the operation box is operated in the operation of moving the rectangular diaphragm and the compensation filter by the operation switch of the operation box. There is a problem that movement control different from the guidance display in the movement direction is performed. As a method for solving this problem, there is a method of providing a mechanism for rotating the rectangular diaphragm and the compensation filter by 90 ° so that the position of each projection image on the monitor is fixed (see, for example, Patent Document 1). However, there are cases where such a rotation mechanism cannot be provided due to the mechanical freedom and margin of the apparatus.

  Further, in the conventional X-ray diagnostic apparatus, since the moving speed of each square blade 112 to 115 is controlled at a preset speed, each square on the monitor is changed by changing the SID or the image intensifier enlargement mode. There was a problem that the moving speed of the blades 112 to 115 changed and it became difficult to operate.

Further, in the conventional X-ray diagnostic apparatus, when the X-ray exposure range is narrowed by the rectangular diaphragms 112 to 115, as shown in FIG. 16, the portions of the square blades 112 to 115 inside the circular diaphragm 111 ( In the shaded portion 141, only the rectangular blades 112 to 115 shield X-rays. The rectangular apertures 112 to 115 slightly transmit X-rays due to transmission, diffraction, and the like. If the slight 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 further reduced.
Japanese Patent Application No. 5-334388

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an X-ray diagnostic apparatus capable of improving operability by improving control of the X-ray diaphragm. It is another object of the present invention to provide an X-ray diagnostic apparatus that can reduce unnecessary X-ray exposure and improve the burden on the subject by improving the X-ray diaphragm. .

  In order to achieve the above object, the present invention takes the following measures.

  A first aspect of the present invention is to change an X-ray source that emits X-rays toward a subject placed on a top and a distribution of X-rays that are emitted from the X-ray source. , At least two compensation filters movable along different directions, X-ray image capturing means for capturing an X-ray image transmitted through the subject, and the X-ray source and the X-ray image capturing means are opposed to each other. An arm for supporting the arm, an arm holding means for holding the arm so as to be rotatable at least in a column rotation direction, a display means for displaying an image picked up by the X-ray image pick-up means, and a moving direction of the compensation filter is indicated. And an operating means for performing compensation so that the moving direction of the compensation filter displayed on the display means coincides with the moving direction input to the operating means when the arm rotates in the support column rotating direction. Compensation filter for switching filters A motor driving unit, an X-ray diagnostic apparatus characterized by comprising.

  According to a second aspect of the present invention, an X-ray source that emits X-rays toward a subject placed on a top board and an exposure range of the X-rays emitted from the X-ray source are limited. An X-ray diaphragm, an X-ray image capturing unit that captures an X-ray image transmitted through the subject, a display unit that displays an image captured by the X-ray image capturing unit, 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, moving the X-ray diaphragm based on an input to the operating means, and the magnification ratio And an X-ray diaphragm driving means for switching the moving speed of the X-ray diaphragm based on the X-ray diaphragm.

  According to a third aspect of the present invention, there is provided an X-ray diagnostic apparatus that exposes X-rays to a subject, detects X-rays transmitted through the subject, and images the internal structure of the subject. A rectangular aperture configured by a plurality of rectangular blades that limit the exposure range of the image, and a circular aperture that limits the X-ray exposure range to a substantially circular shape, so as to circumscribe the imaging region to be imaged The X-ray exposure range by the rectangular diaphragm is controlled, and the X-ray exposure range by the circular diaphragm is controlled so as to circumscribe the X-ray exposure area of the rectangular diaphragm by this control. X-ray diagnostic apparatus.

  As described above, according to the present invention, it is possible to realize an X-ray diagnostic apparatus capable of improving operability by improving control of the X-ray diaphragm. Further, by improving the X-ray diaphragm, it is possible to realize an X-ray diagnostic apparatus that can reliably reduce unnecessary X-ray exposure and reduce the burden on the subject.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a main configuration of an X-ray diagnostic apparatus to which the present invention is applied. This X-ray diagnostic apparatus includes an aperture device 1, a holding device 2, an image processing device 3, and an X-ray generator 4.

  As shown in FIG. 2, the diaphragm device 1 includes a square diaphragm 11, a circular diaphragm 12, a compensation filter 13, and a diaphragm controller 14. The diaphragm controller 14 further includes a speed controller 15 and a switch. A switching control unit 16 is provided.

  As shown in FIG. 3, the holding device 2 includes a rotating arm 21, a C arm 22, a rotating 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 control unit 32, and a monitor 33.

  As shown in FIG. 5, the X-ray generator 4 includes an X-ray tube 41 and an X-ray tube control unit 42.

  The aperture control unit 14 is connected to the rotating arm / C arm control unit 23, and the rotating arm / C arm control unit 23 and the image processing control unit 32 are connected to the image processing control unit 32. An X-ray tube control unit 42 is connected.

  The X-ray tube 41 generates X-rays when a high voltage current controlled by the X-ray tube control unit 42 is supplied, and exposes the X-rays to the imaging region of the subject located at the isocenter. The X-ray exposure surface side of the X-ray tube 41 circumscribes the outer periphery of the compensation filter 13 for preventing X-ray halation and the like and the input surface of the image intensifier constituting the imaging device 31. The circular diaphragm 12, which limits the exposure range to a substantially circular shape, is composed of four rectangular blades, and the rectangular diaphragm 11 is arranged to limit the X-ray exposure range to a substantially square shape.

  The compensation filter 13, the circular diaphragm 12, and the rectangular diaphragm 11 are moved and controlled by the diaphragm controller 14.

  The speed control unit 15 is configured so that the moving speeds of the rectangular diaphragm 11 and the compensation filter 13 on the monitor 33 are not changed apparently in an enlargement mode or the like. It controls the moving speed.

  Regardless of “heading” or “lateral”, the switch switching control unit 16 operates the operation box 24 of the holding device 2 and the rectangular diaphragm 11 and the compensation filter 13 on the monitor 33. The movement control of the rectangular diaphragm 11 and the compensation filter 13 is switched so that the movement directions of the rectangular diaphragm 11 and the compensation filter 13 always coincide.

  As described in the prior art, the X-ray tube 41 and the imaging device 31 are disposed to face both ends of the C arm 22 on the γ axis. The C arm 22 is pivotally connected to one end of the pivot arm 21 that is pivotably suspended from the ceiling. That is, this X-ray diagnostic apparatus includes a triaxial holding device.

  The rotating arm 21 and the C arm 22 are respectively 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 a switch and SID (= source image) for operating the X-ray tube 41, the rotating arm 31, the C arm 32, the rectangular diaphragm 11, the compensation filter 13, and the like. A switch is provided for setting the distance and operating the image intensifier enlargement mode (use size mode).

  X-rays from the X-ray tube 41 pass on the γ-axis and are exposed to the imaging region of the subject located at the isocenter, and an X-ray image transmitted through the imaging region is captured by the imaging device 31. The imaging device 31 includes, for example, an image intensifier that detects X-rays transmitted 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. The

  An 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 when the angle of the rotary arm 21 is “heading” of 0 °. In other words, the circular diaphragm 12 is controlled so as to circumscribe the input surface of the image intensifier of the photographing device 31, and the rectangular diaphragm 11 is arranged above and below the operation box as described in the prior art (see FIG. 14). The first and third square blades correspond to the direction operation, and the second and fourth square blades correspond to the left and right operation of the operation box 24 so that the movement is controlled. It has become.

  The moving speeds of the four rectangular blades of the rectangular diaphragm 11 and the compensation filter 13 have initial values corresponding to the initial value of the SID (= source image distance) and the initial enlargement mode of the image intensifier, respectively. Is set.

  FIG. 6 is a diagram showing the flow of the aperture control process performed by the aperture controller 14, and the rectangular aperture 11 and the like are controlled based on the flow of the aperture control process.

  First, as the process of step 1 (ST1), the angle of the rotating arm 21 operated by the operation box 24 is taken, and as the process of step 2 (ST2), whether or not the absolute value of the taken angle is 45 ° or more. Determine whether.

  Here, if it is determined that the angle of the rotating arm 21 is 45 ° or more, as the processing of step 3 (ST3), the switching unit 14 adjusts the aperture of the rectangular aperture 11 of the operation box 24 in the operation direction of the operation box 24. The setting of the four rectangular blades constituting the corresponding rectangular diaphragm 11 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 square blades correspond to the upper, right, lower, and left on the monitor 33, respectively. The first and third square blades are controlled to move according to the up / down movement operation of the operation box 24, and the second and fourth square blades are controlled to move according to the left / right movement operation.

  Further, when the angle γ of the rotating arm 21 is 90 ° (or −90 °), the fourth, first, second, and third of the upper, right, lower, and left on the monitor 33, respectively. The square blades correspond, and the fourth and second square blades are controlled to move according to the up / down movement operation of the operation box 24 by the setting change by the switch change control unit 16 of the operation box 24, and according to the left / right movement operation. The movement of the first and third rectangular blades is controlled.

  Therefore, when the angle of the rotating arm 21 is 45 ° or more (45 ° or more and less than 135 °, greater than −135 ° and −45 ° or less), in the arrangement of the four rectangular blades of the image on the screen of the monitor 33, The upper and lower groups and the left and right groups are interchanged. However, by changing the settings, the upper and lower sets of rectangular blades on the screen of the monitor 33 can be used for the vertical operation of the operation box 24. The left and right sets of square blades on the screen of the monitor 33 are controlled to move in response to an operation in the left-right direction.

  In the process of step 2, the angle of the turning arm 21 taken in is less than 45 ° (0 ° to less than 45 °, greater than 135 ° to 180 ° or less, −180 ° to −135 °, greater than −45 ° to 0 When 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 process of step 3, the process of step 4 (ST4) It is determined whether or not the enlargement ratio has been changed according to the enlargement mode of the image intensifier of the photographing apparatus 31.

  Here, if it is determined that there is no change in the enlargement ratio, it is determined whether or not there is an operation on the operation box 24 as processing in step 5 (ST5). Here, when it is determined that there is no operation of the operation box 24, the process returns to the above-described step 4 again.

  If it is determined in step 4 described above that there is a change in the enlargement ratio, the enlargement ratio is captured as the process in step 6 (ST6), and the captured enlargement is performed as the process in step 7 (ST7). Based on the ratio, the moving speed of the rectangular diaphragm 11 and the compensation filter 13 is calculated, and the setting is changed according to the calculated moving speed.

For example, as shown in FIGS. 7A and 7B, when the SID (distance) is changed from L1 to L2, the moving speed at L1 is V1, and the screen of the monitor 33 is displayed at L2. The moving speed V2 at which the apparent moving speed does not change is
V2 = (L2 / L1) ・ V1
Can be calculated.

Further, as shown in FIGS. 8A and 8B, when the enlargement mode (diameter size mode) of the image intensifier of the photographing apparatus 31 is changed from S1 to S2, the moving speed at the time of S1. If V1 is V1, the moving speed V2 where the apparent moving speed does not change on the screen of the monitor 33 at S2 is
V2 = (S2 / S1) ・ V1
Can be calculated.

  For example, when the SID is changed to ½, the actual moving speed of the square blade is ½. Similarly, when the enlargement mode of the image intensifier is changed to ½, the actual moving speed of the square blade is ½.

  The movement speed calculated in this way is set as the movement speed of each square blade of the rectangular diaphragm 11 or as the movement speed of the compensation filter 13.

  If it is determined in step 5 described above that the operation box 24 is operated, the speed control unit 15 is controlled based on the operation of the operation box 24 as step 8 (ST8), so that the rectangular aperture Control is performed to move each of the 11 square blades at a set moving speed, and the process returns to the above-described step 5 again.

  Next, as a process of step 9 (ST9), based on the moving amount or moving position of each rectangular blade moved in the process of step 8, it circumscribes the exposure range of the X-rays narrowed by this rectangular diaphragm 11. In addition, the diaphragm control unit 14 performs control to move the circular diaphragm 12, and the process returns to the above-described step 4 again. For example, as shown in FIG. 9, the image intensifier of the imaging device 31 is circumscribed to the exposure range 51 corresponding to the X-ray exposure range 21 in the center of the rectangular diaphragm 11 indicated by a dotted line. The circular diaphragm 12 is controlled to be narrower than the input surface 52.

  Thus, according to this embodiment, when the rotating arm 21 is rotated by 45 ° (45 ° to 135 °, −45 ° to −135 °) or more, the rectangular diaphragm 11 on the screen of the monitor 33 is The square blades corresponding to the operation box 24 are switched by the switch switching control unit 16 so that the moving direction of each rectangular diaphragm and the guide direction of the operation box 24 for controlling the X-ray diaphragm of the operation box 24 coincide with each other. Even if the enlargement ratio is changed by changing the image or the mode of the image intensifier, the speed based on the change of the enlargement ratio so that the moving speed of the square blades on the screen of the monitor 33 does not change apparently. The moving speed of each square blade is changed by the control unit 15, and further, the diaphragm control unit 14 performs control to restrict the circular diaphragm so as to circumscribe the X-ray exposure range narrowed by the rectangular diaphragm. Accordingly, the rectangular diaphragm 11 can be controlled by the operation box 24 of the operation box 24 with the same operation direction and the constant operation speed without changing the operability on the screen of the monitor 33. In addition, unnecessary exposure of X-rays can be more reliably reduced.

  As described above, the operability can be improved and the burden on the subject can be reduced. In this embodiment, the X-ray diaphragm 12 has been described. However, the compensation filter 13 determines the movement direction of the compensation filter 13 on the screen of the monitor 33 and the compensation filter 13 even when the turning arm 21 is turned. The compensation filter 13 may be mechanically rotated so that the guide direction of the operation box 24 to be operated coincides with each other. Similarly to the X-ray diaphragm 12, the rotation arm 21 rotates 45 ° or more. In this case, the compensation filter corresponding to the operation box 24 may be switched so that the moving direction of the compensation filter 13 on the screen of the monitor 33 matches the guide direction of the operation box 24 that controls the compensation filter 13.

  Even if the enlargement ratio is changed by changing the SID or switching the image intensifier mode, the actual moving speed of the compensation filter 13 is compensated on the screen of the monitor 33 in the same manner as the X-ray diaphragm 12. The moving speed of the filter 13 may be changed based on the change of the enlargement ratio so that the apparent speed does not change.

  In this embodiment, the X-ray diagnostic apparatus provided with the compensation filter 13, the circular diaphragm 12, and the rectangular diaphragm 11 composed of four rectangular blades has been described. However, 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 having only the rectangular diaphragm 11 without the compensation filter 13 and the circular diaphragm 12, and the rectangular diaphragm has two, three, five, It may be composed of six square blades.

  As described above in detail, according to the present embodiment, the guide direction of the operation of moving the X-ray diaphragm or compensation filter is made to coincide with the movement direction of the X-ray diaphragm or compensation filter on the monitor screen by that operation. Further, by controlling the movement of the X-ray diaphragm or the compensation filter, the SID or the image intensifier is enlarged so that the moving speed of the X-ray diaphragm or the compensation filter on the screen of the monitor 33 is not apparently changed. By controlling the moving speed of the X-ray diaphragm or the compensation filter in accordance with the enlargement ratio depending on the mode or the like, the operator can always operate the X-ray diaphragm or the compensation filter with the same operation feeling, and the operability is improved. It is possible to provide an X-ray diagnostic apparatus that can

  Further, by controlling the circular diaphragm of the X-ray diaphragm so as to circumscribe the X-ray exposure range of the rectangular diaphragm, X-rays transmitted or diffracted by the rectangular diaphragm can be further shielded, and more reliably unnecessary. It is possible to provide an X-ray diagnostic apparatus that can reduce the X-ray exposure and reduce the burden on the subject.

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 embodiment. FIG. 3 is a block diagram showing a holding device of the X-ray diagnostic apparatus according to the embodiment. FIG. 4 is a block diagram showing an image processing apparatus of the X-ray diagnostic apparatus according to the embodiment. FIG. 5 is a block diagram showing an X-ray generator of the X-ray diagnostic apparatus according to the embodiment. FIG. 6 is a diagram showing a flow of an aperture control process performed by an aperture controller of the X-ray diagnostic apparatus according to the embodiment. FIG. 7 is a diagram for explaining the change of the SID in the X-ray diagnostic apparatus according to the embodiment. FIG. 8 is a diagram for explaining a change of an image intensifier enlargement mode in the X-ray diagnostic apparatus according to the 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 embodiment. FIG. 10 is a perspective view showing a gantry portion of the X-ray diagnostic apparatus. FIG. 11 is a schematic diagram for explaining the rotation direction and the head insertion and horizontal insertion of the rotation arm and the C arm in the X-ray diagnostic apparatus. FIG. 12 is a diagram showing an arrangement relationship between 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 an arrangement relationship between the input surface of the image intensifier and the compensation filter in the X-ray diagnostic apparatus. FIG. 14 is a diagram showing operation guidance of the operation box 24 for controlling the rectangular diaphragm in the X-ray diagnostic apparatus. FIG. 15 is a diagram showing the position of a rectangular diaphragm on the monitor screen 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 ... Turning arm, 9 ... Monitor, 10 ... Compensation filter, 11 ... Circular aperture, 12 ... Square aperture, 13 ... Moving mechanism control unit, 13-1 ... Speed control unit, 14 ... Switching unit 15 ... Operation box

Claims (5)

An X-ray source that emits X-rays toward a subject placed on the top;
Changing the distribution of X-rays emitted from the X-ray source, at least two compensation filters movable along different directions;
X-ray image capturing means for capturing an X-ray image transmitted through the subject;
An arm that supports the X-ray source and the X-ray image capturing unit opposite to each other;
Arm holding means for holding the arm so as to be rotatable at least in the column rotation direction;
Display means for displaying an image captured by the X-ray image capturing means;
Operating means for instructing the moving direction of the compensation filter;
Compensation filter driving means for switching the compensation filter to move so that the movement direction of the compensation filter displayed on the display means coincides with the movement direction input to the operation means when the arm rotates in the column rotation direction. When,
An X-ray diagnostic apparatus comprising: An X-ray source that emits X-rays toward a subject placed on the top;
An X-ray diaphragm for limiting the exposure range of X-rays emitted from the X-ray source;
X-ray image capturing means for capturing an X-ray image transmitted through the subject;
Display means for displaying an image captured by the X-ray image capturing means;
Operating means for instructing movement of the X-ray diaphragm;
Means for changing the magnification of the X-ray image displayed on the display means;
X-ray diaphragm driving means for moving the X-ray diaphragm based on an input to the operation means, and for switching the moving speed of the X-ray diaphragm based on the magnification factor;
An X-ray diagnostic apparatus comprising: A compensation filter that changes the distribution of X-rays emitted from the X-ray source;
Operating means for instructing movement of the compensation filter;
Compensation filter driving means for moving the compensation filter based on an input to the operation means, and for switching a moving speed of the compensation filter based on the enlargement ratio;
The X-ray diagnostic apparatus according to claim 2, further comprising: The X-ray diaphragm drive means makes the movement speed of the X-ray diaphragm on the display means substantially constant by decreasing the movement speed of the X-ray diaphragm as the enlargement ratio increases.
The compensation filter driving means makes the movement speed of the compensation filter on the display means substantially constant by decreasing the movement speed of the compensation filter as the enlargement ratio increases;
The X-ray diagnostic apparatus according to claim 2 or 3, wherein In an X-ray diagnostic apparatus that exposes X-rays to a subject, detects X-rays transmitted through the subject, and images the internal structure of the subject.
A rectangular aperture composed of a plurality of rectangular blades that limit the X-ray exposure range;
A circular diaphragm for limiting the X-ray exposure range to a substantially circular shape;
Controlling the X-ray exposure range by the rectangular aperture so as to circumscribe the imaging area to be imaged;
Controlling the X-ray exposure range by the circular diaphragm so as to circumscribe the X-ray exposure area of the rectangular diaphragm by this control;
X-ray diagnostic apparatus characterized by the above.

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