JPH0712959Y2 - X-ray diaphragm device for X-ray fluoroscopy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention narrows down an X-ray beam emitted from an X-ray tube focus so as to obtain a square or rectangular irradiation field of a desired size. The present invention relates to an X-ray diaphragm device for fluoroscopic imaging.

[Conventional technology]

For example, in the case of performing fluoroscopic imaging using a contrast agent such as double contrast imaging, in order to eliminate the influence of unnecessary X-rays or to prevent halation and obtain an indirect photograph with high diagnostic ability, A diaphragm device is attached to the X-ray tube device to limit the X-ray field. This X-ray diaphragm device is orthogonal to each other and passes through the center line of the X-ray beam.
Although there are two pairs of diaphragm pieces arranged symmetrically with respect to each of the two axes of symmetry, each pair of diaphragm pieces always moves symmetrically with respect to each axis of symmetry, and as a result, in one direction. The X-ray irradiation field can be narrowed to the upper / lower side or the left / right side by the same dimension in the following (hereinafter referred to as “vertical direction” for convenience) or in the direction perpendicular thereto (hereinafter referred to as “horizontal direction” for convenience). Become. Therefore, for example, when it is necessary to narrow down the irradiation field only in either the left direction or the right direction, conventionally, the subject itself is previously moved in the right direction or the left direction, and the irradiation field is narrowed evenly in the left and right directions. However, the X-ray imaging was performed by operating the diaphragm device after positioning so that the diagnostic ability would not be affected.

[Problems to be solved by the invention]

However, in the conventional method, when it is necessary to examine a large number of subjects in a short time, such as a mass examination of the stomach (massive mass examination), it takes time to position the subjects. It will be spent and cause trouble.

On the other hand, if a single-acting drive type diaphragm device that can separately move each pair of diaphragm pieces on the left and right is used, the above problem can be solved, but the apparatus itself becomes large, and fluoroscopic imaging for gastric mass examination to be used as an on-vehicle type. When the diaphragm device is attached to the table, a new problem arises such that it interferes with getting on and off the subject.

The present invention has been made in order to provide an X-ray fluoroscopic X-ray diaphragm apparatus which does not have to be a single-acting drive type diaphragm apparatus and which solves the problems of the conventional method.

[Means for solving problems]

The X-ray diaphragm apparatus for X-ray fluoroscopy according to the present invention X has the above-mentioned X-ray beam center line L in a plane orthogonal to the X-ray beam center line L.
On the other hand, a pair of first and second diaphragm pieces made of an X-ray opaque material, which are symmetrically moved by a single drive source in cooperation with each other, are arranged so that the moving directions of the respective diaphragm pieces are orthogonal to each other. ,
In a conventional X-ray fluoroscopic X-ray diaphragm apparatus in which a rectangular irradiation field is obtained with the first and second diaphragm pieces, a mask plate having a rectangular opening is orthogonal to the X-ray beam center line L. In order to move the mask plate in a rectangular irradiation field formed by the first and second diaphragm pieces, the movable plate is arranged in the plane so as to be movable in the moving direction of the one diaphragm piece, and a moving driving means is provided. It is characterized by having done.

[Action]

In the X-ray fluoroscope apparatus for X-ray fluoroscopy according to the present invention, for example, when the mask plate can be reciprocated in the left-right direction, first the first diaphragm piece is made in the same manner as the conventional diaphragm apparatus. And each of the second diaphragm pieces are moved by the same size respectively, and after narrowing down the square or rectangular irradiation field, the mask plate is moved to the left or right direction to obtain the right region of the irradiation field. Alternatively, only one of the left areas can be further narrowed down.

〔Example〕

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

FIG. 1 shows an X-ray fluoroscopic X-ray according to an embodiment of the present invention.
FIG. 2 is a schematic side view showing a schematic configuration of a line drawing device together with an X-ray tube device, and FIG. 2 is a plan view of a mask device forming a part of the X-ray drawing device.

This X-ray fluoroscopic X-ray diaphragm device 1 includes an X-ray tube device 2
And the center line L of the X-ray beam cone emitted from the focal point F is aligned with the axis. X-ray diaphragm device 1
Is a pair of first diaphragm pieces 3 and 3'arranged symmetrically with respect to one symmetry axis passing through the center line L of the X-ray beam, and also X
A pair of second diaphragm pieces 4, 4'arranged symmetrically with respect to another symmetry axis that passes through the line beam center line L and is orthogonal to the symmetry axis.
Are housed inside the housing 5 so that and are located in a plane orthogonal to the X-ray beam center line L. Each diaphragm piece 3,
Reference numerals 3 ', 4 and 4'represent a strip shape made of an X-ray opaque plate material, for example, a lead plate material, and the first diaphragm pieces 3 and 3'or the second diaphragm pieces 4 and 4'are Rotating shafts 6, 6'as shown
Alternatively, it is fixed to the tip of a lever that rotates around 7, 7 '. Therefore, when the rotary shafts 6, 6'or 7, 7'are rotated by respective driving means (not shown), the first diaphragm pieces 3, 3'or the second diaphragm pieces 4, 4 '.
Move symmetrically with each other with respect to the X-ray beam center line L, and simultaneously move in the same distance and opposite directions with respect to the X-ray beam center line L.

The above-mentioned configuration is similar to that of the conventional X-ray diaphragm device, but the X-ray fluoroscopic X-ray diaphragm device 1 according to the present invention further has a mask device 8 built in the housing 5, and in the embodiment, The mask device 8 is arranged between the first diaphragm pieces 3 and 3'and the second diaphragm pieces 4 and 4 ', orthogonal to the X-ray beam center line L. The mask device 8 includes a substrate 11 made of an X-ray transparent plate material, a mask plate 12 made of an X-ray opaque plate material, for example, a lead plate material, arranged on the substrate 11 in parallel with the substrate 11, and driving the mask plate 12. Means, motor in this illustrated example
It is composed of 13 mag. A square opening 14 is provided at the center of the mask plate 12, and the mask plate 12 has the opening.
Only X-rays passing through the 14th part are made to pass through the subject and are made incident on the image intensifier (both not shown),
The X-ray in the peripheral portion blocks this. And mask plate 12
Is reciprocally movable on the substrate 11 guided by the guide 15 in parallel therewith, and both ends of the mask plate 12 are fixed to the edge portions of the mask plate 12, and the wire 19 stretched by the pulleys 16, 17, 18 is stretched. It is driven by the motor 13 via. In the figure,
Limit switches 20 and 20 'are provided for stopping the rotation of the motor 13 and stopping the mask plate 12 at both left and right end positions. The driving means of the mask plate 12 is not limited to the above description and the illustrated example, but it must be compact enough to be installed in the housing 5.

Next, the operation of the X-ray diaphragm device 1 will be described. First, the first diaphragm pieces 3 and 3'and the second diaphragm pieces 4 and 4'are rotationally driven to bring the irradiation field to a certain degree. Then, for example, when further narrowing down the right side area, turn on the drive switch (not shown) of the motor 13,
The mask plate 12 is moved to the left by rotating the rotating shaft clockwise. When it is desired to narrow down the left side area, the motor 13 may be rotated in the reverse direction. This mask plate 12
The relationship between the movement of the field and the irradiation field will be described with reference to FIG. In the figure, a circle 21 indicated by a chain double-dashed line is an assumed X-ray incidence plane of the image intensifier. The state of (a) is a standard state, and the mask plate 12 is arranged at the left and right even positions.
In the case of narrowing down only the left side region of the irradiation field from the state shown in (a), the mask plate 12 is moved in the direction of arrow A (rightward) to obtain the state shown in (b). As a result, the X-ray of the portion corresponding to the shaded portion P is blocked by the mask plate 12. On the contrary, when only the right side region of the irradiation field is narrowed down from the state shown in FIG.
Is moved in the direction of arrow B (leftward), and the state shown in FIG. As a result, X in the portion corresponding to the shaded portion P '
The lines will be interrupted by the mask plate 12.

〔effect〕

Since the present invention is configured as described above, it has the following effects. That is, in X-ray fluoroscopy, for example, when it is desired to narrow the irradiation field in either the left direction or the right direction, the subject itself must be moved in the right direction or the left direction as in the conventional X-ray diaphragm device. Instead, the irradiation field in only one direction can be narrowed down.
In addition, the function of the diaphragm device is substantially the same as that of the diaphragm device of the single-acting type, and the size of the diaphragm device itself is the same as that of the conventional device. Furthermore, the operation of narrowing down is simpler than that of a single-acting drive type device.

As described above, the present invention is an X-ray diaphragm suitable for being mounted on an over-tube type fluoroscopic stand for gastric mass examination, which has a short distance between the X-ray tube focus and the image intensifier, which is particularly used as a vehicle type. A device could be provided.

[Brief description of drawings]

FIG. 1 is a schematic side view showing, together with an X-ray tube device, a schematic configuration of an X-ray diaphragm device which is an embodiment of the present invention, and FIG.
FIG. 3 is a plan view of a mask device forming a part of the X-ray diaphragm device, and FIG. 3 is a diagram for explaining a relationship between a moving direction of a mask plate of the mask device and an irradiation field. DESCRIPTION OF SYMBOLS 1 ... X-ray diaphragm apparatus for X-ray fluoroscopy, 2 ... X-ray tube apparatus 3, 3 '... 1st diaphragm piece 4, 4' ... 2nd diaphragm piece 5 ... Housing | casing, 8 ... Mask apparatus 11 ... Substrate , 12 ... Mask plate 13 ... Motor, 14 ... Opening

Claims (1)

[Scope of utility model registration request] 1. In a plane orthogonal to the X-ray beam center line L,
A pair of first diaphragm pieces made of an X-ray opaque material that move symmetrically with respect to the X-ray beam center line L, and X-rays that move symmetrically with respect to the X-ray beam center line L. A pair of second diaphragm pieces made of an opaque material are arranged so that the moving directions of the respective diaphragm pieces are orthogonal to each other, and the first and second diaphragm pieces are symmetrically moved by respective driving means. , X-ray for X-ray fluoroscopy for obtaining a rectangular irradiation field
In the line diaphragm device, one of a mask plate having a square opening is provided in a rectangular irradiation field formed by the first and second diaphragm pieces and in a plane orthogonal to the X-ray beam center line L. An X-ray fluoroscopy apparatus for X-ray fluoroscopy, wherein the X-ray fluoroscopy is provided so as to be movable in the moving direction of the diaphragm piece and provided with a drive means for moving the diaphragm piece.