JPH0219124Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to an oblique angle imaging device for medical X-ray equipment, and in particular, what angle of inclination does the support with the X-ray source attached to the upper end have? The present invention relates to an oblique angle photographing apparatus 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 fluoroscopy means.

[Prior Art] A general example of a conventional X-ray fluoroscopic imaging device capable of performing oblique angle imaging is shown in FIGS. 4 and 5. In the figure, a column 102 having an X-ray source 101 fixed to its upper end is supported by a base 105 by a shaft 104 so as to be tiltable about the shaft 104 . A snapshot unit 113 holding an X-ray image recording medium such as a continuous imaging device, for example, a film 111 is installed on the base 105, and an X-ray fluorescence multiplier 11 is installed on the base 105.
2 (hereinafter also referred to as II) is connected to the snapshot section 113.

This oblique angle photographing device uses a support 102 as a base 10.
5, a guide plate 103 having an arcuate upper part and a lower part fixed to a base 105 was provided, and the guide plate 103 was fixed to a column 102 so as to be movable along the outer circumference of the arc. 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.
It is designed so that it can be tilted along 3. 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.

[Problem 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 is off 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.
The problem was that the entire area of 12 areas could not be used effectively.

In view of the above problems of the prior art, the present invention is capable of displaying the tilting angle of the support (the angle of incidence of the center of the X-ray flux with respect to the film), and that the central axis of the X-ray flux is always The center of the film in the line image capturing means and the I. of the fluoroscopy means.
It is an object of the present invention to provide a novel oblique angle photographing device for a medical X-ray device that passes through the center of I.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a column that supports an X-ray source at its upper end, a column that is tiltably supported, and a first guide mechanism that supports a medical X-ray source.
a support stand movably supported in the longitudinal direction of the top plate of the wire apparatus; a support tilting mechanism for tilting the support stand in association with movement of the support stand and tilting of the support stand; an X-ray image capturing device that holds the X-ray image recording medium on the tilting center axis of the support; and a second guiding mechanism supported below the X-ray image capturing device so as to be movable in the longitudinal direction of the top plate. an X-ray fluoroscope, the column tilting mechanism, a support base, and an X-ray fluoroscope;
a connecting mechanism that connects the fluoroscopes and keeps the center of the image receiving surface of the X-ray fluoroscope 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 is tilted; and the support. The tilting mechanism includes a scale plate provided on the tilting mechanism and having an angle scale corresponding to the amount of movement of the support base and the tilt angle of the support base, and a pointer arranged to move in proportion to the movement of the support base. This configuration constitutes an oblique angle photographing device for a medical X-ray apparatus.

[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. Further, the scale plate and the pointer indicate the inclination angle of the column, that is, the angle that the X-ray flux center line makes with the top plate and the X-ray image recording medium.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a front view of the oblique angle photographing device, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a 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
The 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 column 9 in order to pivotally support the lower end of the support column 9. One side of the shaft 18 protrudes, and the protrusion 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 at 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-like member that stands upright in parallel with the support 9; 28 is the member 2;
A right-angled horizontal plate-shaped member fixed to 1.
The member 21 and the member 28 are formed into an L shape and constitute a guide plate. A linear groove 23 is provided in the member 21 in parallel with the central axis of the X-ray flux, and a sliding member 24 that can slide along the groove is fitted into the linear groove 23. 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 central axis of the X-ray beam always coincides with a line connecting the axes of the axis 25 and the axis 18 of the tilting fulcrum, regardless of whether the column 9 is upright or tilted. In addition, member 21
An elongated hole 22 is bored in the member 21 so that the shaft 18 passing through the member 21 can move without interfering with anything when the support column 9 is tilted. 26
27 is a motor installed inside 10A, and 27 is a speed reducer also installed inside 10A, and both are connected by a belt pulley and a belt. 2
Reference numeral 9 indicates a rack fixed to the member 28, 30 indicates a pinion that meshes with the rack 29, and the pinion 30 is fixed to the output shaft of the speed reducer 27. The above motor 26, reducer 27, rack 29, pinion 30
This constitutes a moving mechanism for tilting the column 9 and moving the see-through means. 31 and 33 are rollers attached to the member 28, and the roller 3
1 and 33 roll along guide rails 15 and 16 to guide and support a guide plate made up of 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.
41 is a support member 4 fixedly installed on the support stand 10
Roller 4 rolling on rail 45 fixed to 4
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 strut 9, II engaged with the support stand 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 arranged so as to sandwich a rail 76 provided on the side surface of the support base 10 on the side of the column 9, and when the motor 26 is driven, only on the rail 76.

Next, the structure of the inclination angle display means of the support column 9 will be explained. 62 is a scale plate equipped with a linear angle scale 61 and attached to the member 21;
A pair of pulleys 5 and 66 are placed at both ends of the scale plate 62 and are attached to the member 21.
69 and 70 are a pair of pulleys attached to the support plate 60, and the support plate 60 is fixed to the support base 10. Reference numeral 64 denotes a rope wound around pulleys 65, 66, 69, and 70. Both ends of the rope 64 are fixed to the member 21, respectively, but in this embodiment, there is a rope at one end for constantly applying tension to the rope 64. A coil spring 64A is interposed. A pointer 63 is fixed to the rope 64 and is moved along the angle scale 61 as the rope 64 moves.

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 including the pillar 9, I.I 41, link 51, etc. also moves integrally 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 inclination angle 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 9 tilts due to the movement of the support 10, the center of the surface of the film F in the support 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 axis 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.

On the other hand, as the support stand 10 moves, the I.I 41
Since it can be moved by a predetermined horizontal distance set by the ratio of the distance between the axes via the link 51, the center of the I.I 41 will be moved to a position corresponding to the tilting angle, no matter which position the column 9 is tilted to. Let me, I.I41
The center of the X-ray flux can be kept in alignment with the central axis of the X-ray flux.

The angle of inclination of the support column 9 is displayed on a scale by the display means. That is, when the support stand 10 moves in the direction of arrow H, for example, to the right in FIG.
The pulleys 69 and 70 are connected to the support plate 60 in the moving direction.
moves, the distance between the pulley 70 and the pulley 66 is shortened, and at the same time, the distance between the pulley 69 and the pulley 6 is shortened by the shortened distance.
5 is expanded. Therefore, the pointer 63 fixed to the rope 64 moves along with the rope 64 to the left in FIG. It moves along the plate 62. In this embodiment, since the rope 64 has two ropes,
The pointer moves twice as far as the moving distance of the support base 10, which increases display accuracy and improves visibility. Therefore, the tilt angle of the support column 9 is
It is determined by the ratio of the moving distance of the support stand 10 and the distance between the axes 18 and 25, and the angle scale 61 is twice the movement distance of the support stand 10 converted into an angle. Since this angle scale 61 is arranged on the upright member 21, the practitioner can confirm the tilting angle of the support column 9 at a glance. Since there is only the member 21, the practitioner can easily approach the subject from both sides of the top plate.

[Effects of the invention] Since the present invention is constructed 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.

Then, the inclination angle of the support column due to the movement of the support base is
By providing a display means for displaying a scale, it is possible to easily and easily set the desired angle of inclination of the prop during oblique angle photography, and the amount of tilting of the prop can be tracked in the direction in which the prop is tilted. By displaying the angle using a moving pointer, the inclination angle of the support can be more easily confirmed at a glance.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the oblique angle photographing device of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 2. It is. FIG. 4 is a front view showing a general example of a conventional X-ray fluoroscopic imaging device capable of performing oblique angle imaging, and FIG. 5 is a view taken along the - arrow in FIG. 9... Support column, 10... Support stand, 18... Shaft, 2
1, 28... Member (guide inner plate), 23... Straight groove,
25...Axis (tilting fulcrum), 26...Motor, 29
... Rack, 30 ... Pinion, 41 ... II (transparent means), 51 ... Link, 61 ... Angle scale,
62... Dial plate, 63... Pointer, 64... Rope, 65, 66, 69, 70... Pulley, F... Film.

Claims (1)

[Scope of utility model registration request] A support column that supports an 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 table with the tilting of the column; and an X-ray image capturing mechanism that is disposed within the support and holds an X-ray image recording medium on the center axis of tilting of the column. an X-ray fluoroscope supported below the X-ray imaging device so as to be movable in the longitudinal direction of the top board by a second guide mechanism, and a link between the column tilting mechanism, the support base, and the X-ray fluoroscope. Even if the supporting column is tilted, the center of the image receiving surface of the X-ray fluoroscope is always aligned with the X-ray source.
a connecting mechanism positioned on an extension of a line connecting the centers of the line image recording medium; and a scale plate provided on the column tilting mechanism and provided with an angular scale that corresponds to the amount of movement of the support base and the tilting angle of the column. An oblique angle photographing device for a medical X-ray apparatus, comprising: a pointer arranged to move in proportion to the movement of the support base.