JPH0245452B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oblique-angle imaging device for an X-ray fluoroscopic imaging table, and in particular, the present invention relates to an oblique angle imaging device for an X-ray fluoroscopic imaging table, and in particular, it The present invention relates to an oblique angle photographing device suitable for always aligning the central axis of an X-ray beam, the center of an X-ray image recording medium, and the center of an image receiving surface of a fluoroscope, regardless of the angle.

[Prior Art] A general example of an apparatus capable of performing oblique angle imaging using a conventional X-ray fluoroscopic imaging table is shown in FIGS. 4 and 5.
In the figure, a column 102 with an X-ray source 101 fixed to its upper end is attached to a base 105 by a shaft 104.
It is supported so as to be tiltable around 04. A snapshot unit 11 that holds an X-ray image recording medium such as a continuous imaging device, for example, a film 111 on a base 105.
3 is installed, and a fluoroscopic means (hereinafter also referred to as II) including an X-ray fluorescence multiplier tube 112
Connected to 3.

This oblique angle photographing device uses a support 102 as a base 10.
A guide plate 103 is provided which is tiltably attached to the guide plate 103 and has an arc-shaped upper part and a lower part fixed to a base 105, and is fixed to a support column 102 so as to be movable along the outer circumference of the arc of the guide plate 103. A drive motor 106, a pinion 107 directly connected to the output shaft of the drive motor 106, and a fan-shaped gear 108 provided on the arc portion of the guide plate 103 to mesh with the pinion 107 are provided, respectively.
6 to move the support column 102 to the guide plate 10.
3 so that it can be tilted. Further, the tilt angle of the column 102 is indicated by a pointer 115 attached to the column 102 moving along an angle scale plate 114 provided on the cover 109 of the guide plate 103.

[Problems to be Solved by the Invention] The problem with such an oblique-angle imaging device is that when performing oblique-angle imaging, the central axis of the X-ray beam deviates from the center of the film and the center of the image receiving surface of II. The possible area is much smaller than in the normal case where the centers coincide, and the fluoroscopic image and the photographed image do not match, meaning that what was visible in fluoroscopy is not captured on the film. There is. To explain this with reference to the figure, when the support column 102 is rotated by an angle θ, the X-ray source 1
The central axis 116 of the X-ray flux emitted from 01 is
On the film 111, the dimension l ₁ and I.I11
2 off center by a dimension l ₂ . As a result, part of the X-ray flux that is off the center axis 116 is not irradiated to the film 111 and the I.I.
There was a problem that the entire area of 12 could not be used effectively.

In view of the problems of the prior art described above, the present invention provides a novel method in which the central axis of the X-ray beam always passes through the center of the film in the X-ray image capturing means and the center of II of the fluoroscopy means, regardless of the tilted position of the support. An object of the present invention is to provide an oblique angle imaging device for an X-ray fluoroscopic imaging table.

[Means for Solving the Problems] In order to achieve the above object, the oblique angle imaging device for an X-ray fluoroscopic imaging table of the present invention includes a support that supports an X-ray source at an upper end, and a support that is tiltable. a support stand supported by a first guide mechanism and movable in the longitudinal direction of the top plate of the medical X-ray apparatus, and a support column that tilts the support column by correlating the movement of the support table with the tilting of the support column. a tilting mechanism; an X-ray image capturing device disposed within the support base and holding the X-ray image recording medium on the tilting center axis of the support; and a second guide mechanism located below the X-ray image capturing device. The X-ray fluoroscope is supported movably in the longitudinal direction of the top board, and the column tilting mechanism, the support base, and the X-ray fluoroscope are connected, so that even if the column is tilted, the center of the image receiving surface of the X-ray fluoroscope is always maintained. and a connecting mechanism positioned on an extension of a line connecting the X-ray source and the center of the X-ray image recording medium.

[Operation] The movement and tilting of the column and the support base are associated with each other via the column tilting mechanism, and when the column tilting mechanism operates, the column tilts and tilts, while the support base moves in the longitudinal direction of the top plate. do. Even during this movement, the connection position between the column and the support remains unchanged, so the X-ray image recording medium faces the X-ray source without changing its position. When the column and the support stand move, the X-ray fluoroscope moves due to the action of the coupling mechanism, and the center of the image receiving surface of the X-ray fluoroscope is located on the extension of the line connecting the X-ray source and the center of the X-ray image recording medium. be located in Therefore, the center of the image observed through fluoroscopy and the center of the captured image on the X-ray image recording medium will not be misaligned, and no missing images will occur.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a front view of the oblique angle photographing device, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. 2. In the figure, reference numeral 9 denotes a column with an X-ray source (not shown) attached to its upper end, and 10 houses an X-ray image capturing means such as a film holder (not shown) in the interior 10A. 1st
This support table is movable linearly in the direction of arrow H shown in the figure, and the figure shows the position of the film F held between the film holders during photographing. A top plate on which the subject is placed is placed above the support base 10. Reference numeral 11 denotes a table that supports the support stand 10 and guides it in the direction of the arrow H;
Guide rails 15 and 16 provided on the table 11
This is done by rolling rollers 12 and 13 attached to a stand 14 whose upper part is fixed to a support stand 10. Reference numeral 18 denotes a shaft fixed to the support 9 to support the lower end of the support 9. One side of the shaft 18 projects, and the projection is inserted into the interior 10a from the side surface of the support base 10. Bearings 19 and 20
is rotatably supported. Here, the support position of the shaft 18 is such that the axis coincides with the film F surface, and the axis is located on the central axis of the X-ray flux emitted from the X-ray source at the upper end of the support column 9. 21 is a plate-shaped member that stands upright in parallel with the support 9; 28 is a right-angled horizontal plate-shaped member that is fixed to the member 21; the member 21 and the member 28 are formed into an L shape to constitute a guide plate. are doing. A straight groove 23 is provided in the member 21 in parallel with the central axis of the X-ray flux, and a sliding member 2 that can slide along the straight groove 23 is provided in the straight groove 23.
4 is inserted. The sliding member 24 is pivotally connected to a shaft 25 fixed to the column 9, and the shaft 25 is located on the central axis of the X-ray beam, and serves as a tilting fulcrum for the column 9. When the column 9 is tilted, the sliding member 24 This movement causes the support 9 to tilt in the direction of arrow R. Therefore, the above X
The central axis of the wire bundle is configured to always coincide with a line connecting the respective axes of the axis 25 and the axis 18 of the tilting fulcrum, regardless of whether the support 9 is upright or tilted. Further, a long hole 22 is bored in the member 21, and the member 21
A shaft 18 passing through the support column 9 can be moved without interfering with anything when the support column 9 is tilted. 26 is a motor installed inside 10A,
27 is a speed reducer also installed inside 10A, and both are connected by a belt pulley and a belt. 29 is a rack fixed to the member 28;
A pinion 30 meshes with the rack 29, and the pinion 30 is fixed to the output shaft of the speed reducer 27.
The motor 26, speed reducer 27, rack 29, and pinion 30 constitute a moving mechanism for tilting the column 9 and moving the see-through means. 31,3
Reference numeral 3 denotes a roller to which the member 28 is attached, and the rollers 31 and 33 roll along the guide rails 15 and 16 to guide and support the guide plate made up of the members 21 and 28.

Reference numeral 41 denotes II which is disposed below the X-ray image photographing means and facing the X-ray image photographing means;
I41 is a roller 4 rolling on a rail 45 fixed to a support member 44 fixed to the support base 10.
2 and 43, it is guided and supported by the support base 10 so as to be movable together with the support base 10, and is movable independently of the movement of the support base 10 in the movement direction of the support base 10 when the support base 9 is tilted in the support portion. It's summery. Reference numeral 47 denotes a pair of support members fixed to the support base 10. A rail 48 is provided between the support members 47, and a sliding bearing 46 fixed to the I.I 41 can slide on the rail 48. is fitted.
Reference numeral 51 denotes a link that connects the member 28, the support base 10, and the I.I. 41 to each other; one end of the link 51 is pivotally connected to a shaft 52 fixed to the member 28, and the other end is an arm extending from the I.I. 56 is engaged through the elongated hole 53, and the intermediate portion is engaged with the shaft 55 fixed to the support stand 10 through the elongate hole 54, and when the support stand 10 moves, The link 51 is pushed in the moving direction of the support stand 10 by the shaft 55 fixed to the support stand 10, and the link 51 is rotated around the axis 52 according to the amount of movement of the support stand 10. The I.I 41 is moved along the rail 48 via the rail 57. 7
3 is a sprocket mounted on the table 11, and the sprocket 73 is driven by a drive mechanism (not shown) to move the chain 71 wound around the sprocket 73. chain 71
is connected to the member 28 by a connecting member 72, and by driving the chain 71, the support base 1 is moved through the meshing of the rack 29 and the pinion 30.
0 and the struts 9, II engaged with the support base 10
At the same time, the X-ray imaging system consisting of 41 mag.
It is designed to move in the longitudinal direction. 75
are a plurality of rollers attached to the member 21, and the rollers 75 are disposed so as to be sandwiched between the rails 76 provided on the side surface of the support base 10 on the column 9 side, and when the motor 26 is driven, only on the rail 76.

Next, the operation of the above configuration will be explained. When the chain 71 is driven by a drive mechanism (not shown) via the sprocket 73, the support base 10 is moved via the connecting member 72, the member 28, the rack 29, and the pinion 30, and is engaged with the support base 10. The X-ray imaging system, such as the column 9, I.I 41, and link 51, also moves together to move to the desired imaging position of the subject. When the drive of the chain 71 is stopped at this position and the motor 26 is driven to tilt the support column 9 at a desired angle, since the member 28 is stopped, the pinion 30 rolls on the rack 29, thereby causing the relative position. The support stand 10 moves in the direction of arrow H. When the support base 10 moves, the lower end of the support column 9 also moves horizontally in the direction of arrow H together with the shaft 18, and at the same time, the lower end of the support column 9 also moves horizontally in the direction of arrow H.
The tilting fulcrum moves in the vertical direction along the straight groove 23 via the sliding member 24 while tilting in either direction of the arrow R with the shaft 25 as the fulcrum. In this case, the angle of inclination of the support column 9 is proportional to the amount of movement of the support base 10.

On the other hand, the support base 10 is moved by pushing the link 51 in the moving direction by the shaft 55, and at the same time pushing the link 51 in the moving direction by the shaft 55.
The distance between the axis 55 and the axis 52 with , as the fulcrum,
I.I 41 is moved via axis 57 by an amount determined by the ratio of the distance between axis 55 and axis 57.
The ratio of the distances is set so that the distance in the horizontal direction corresponds to the distance in the vertical direction between the surface of the I.I. 41 and the surface F of the film.

Even if the support column 9 tilts as the support table 10 moves, the center of the surface of the film F in the support table 10 (the center of the area of the film F) and the axis of the shaft 18 are made to coincide with each other. Since the line connecting the axial center of the shaft 25 of the tilting fulcrum coincides with the central axis of the X-ray flux, the center of the film surface F moves to the position corresponding to the tilting angle, no matter which position the column 9 tilts. However, the center of the film F surface (the center of the film area) is kept in alignment with the central axis of the X-ray flux.

As the support base 10 moves, the I.I 41 is moved by a predetermined horizontal distance determined by the ratio of the distance between the axes via the link 51, so that no matter which position the support column 9 tilts, By moving the center of the I.I 41 to a position corresponding to the tilt angle, the center of the I.I 41 can be kept in alignment with the central axis of the X-ray flux.

Furthermore, since the member 21 is the only device that protrudes upward from the top plate on which the subject is placed, the practitioner can easily approach the subject from both sides of the top plate.

[Effects of the Invention] Since the present invention is configured as described above, the central axis of the X-ray flux is always aligned with the center of the film in the X-ray image capturing means and the center of II of the fluoroscopy means, regardless of the tilting of the support. This has the effect of making it possible to pass through.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the oblique angle photographing device of the present invention, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line - in FIG. be. FIG. 4 is a front view showing a general example of a conventional X-ray fluoroscopic imaging table capable of performing oblique angle imaging, and FIG. 5 is a view taken in the direction of the - arrow in FIG. 4. 9... Support column, 10... Support stand, 18... Shaft, 2
1, 28... Member (guide plate), 23... Straight groove,
25...Axis (tilting fulcrum), 26...Motor, 29
...Rack, 30...Pinion, 41...II (transparent means), 51...Link, F...Film.

Claims (1)

[Claims] 1 A support column that supports the X-ray source at its upper end, a support base that tiltably supports the support column and is supported movably in the longitudinal direction of the top plate of the medical X-ray apparatus by a first guide mechanism; a column tilting mechanism that tilts the column by correlating the movement of the support with the tilting of the column; and an X-ray image disposed within the support and holding an X-ray image recording medium on the center axis of tilting of the column. An imaging device, an X-ray fluoroscopy device supported below the X-ray imaging device so as to be movable in the longitudinal direction of the top plate by a second guide mechanism, and a space between the column tilting mechanism, the support base, and the X-ray fluoroscopy device. and a connecting mechanism that connects the support columns so that the center of the image receiving surface of the X-ray fluoroscope is always located on an extension of a line connecting the X-ray source and the center of the X-ray image recording medium even if the support column is tilted. An oblique angle imaging device for an X-ray fluoroscopic imaging table.