JP3398197B2 - X-ray fluoroscopy table - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray camera which is required to perform a divisional photographing and to effectively capture a photographing field of view for each photographing region or photographing procedure on a film. The present invention relates to a fluoroscopy table. 2. Description of the Related Art A conventional X-ray fluoroscopic table of this type is shown in FIGS.
As shown in FIG. 3 is a cross-sectional view schematically showing a main part, FIG. 4 is a perspective view showing a portion of the rapid-moving device and the mask mechanism for divided photographing in FIG. 3, and FIG. 5 is a cross-sectional view taken along line XX in FIG. FIG. 3 is a view showing the arrow direction. In FIGS. 3 to 5, reference numeral 1 denotes an X-ray tube, 2 denotes an aperture device, 3 denotes an X-ray irradiation field, 4 denotes a subject, and 5 denotes an X-ray tube support for supporting the X-ray tube 1. The apparatus, 6 is a case of a speed-shooting device (hereinafter, simply referred to as a speed-shooting case), 7 is a table provided to be able to move up and down and left and right, and 8A and 8B are table support frames. Further, reference numeral 9 denotes a mask for vertical divisional photography, 10 denotes a mask for horizontal divisional photography, 11 denotes a mask drive motor for vertical divisional photography, 12 denotes a mask drive motor for divisional photography,
14 is a driving pulley, and 15 and 16 are driven pulleys. Reference numeral 17 denotes a driving wire rope for the vertically divided photographing mask 9, and reference numeral 18 denotes a driving wire rope for the left and right divided photographing mask 10, which are connected endlessly. 19 is a film holder or cassette (hereinafter, referred to as a film holder), 20 is an X-ray film,
Numeral 2 denotes a vertically divided photographing mask 9 and a left and right divided photographing mask 1
0 is a guide member that supports and guides each of them. The X-ray tube supporting device 5 supports an X-ray tube 1 for generating X-rays and a diaphragm device 2 for determining a direction and an irradiation field that require the generated X-rays. , And is fixed to the snapshot case 6. The flash case 6 has a light-shielding structure, and details of the interior are not shown.
The sheets are taken out one by one, conveyed into a film holder 19 provided with a front and a back of an intensifying screen, and quickly moved within the range of the X-ray irradiation field 3 in a state of being in close contact therewith, thereby performing X-ray photography. After that, it is retracted to the position indicated by the two-dot chain line (outside the X-ray irradiation field), and the photographed X-ray film 20 is placed in the film holder 19.
And a mechanism for carrying in the next unphotographed X-ray film 20 and performing the next radiography. [0008] A table 7 on which the subject 4 rests is provided between the above-mentioned rapid-photography case 6 and the X-ray tube 1.
Are supported by the table support frames 8A and 8B so as to be movable up and down and left and right to set the X-ray imaging region. Between the table 7 and the film holder 19, divided photographing masks 9 and 10 for performing divided photographing are provided. The upper and lower split photographing mask 9 is fixed to a part of a wire rope 17 and is connected to a driving motor 11 by a driving pulley 13 and a driven pulley 15;
The wire rope 17 looped around 15 makes it possible to move between the position of the X-ray irradiation field 3 and the position retracted therefrom (the position indicated by the two-dot chain line in FIG. 4). The left-right divided photographing mask 10 is also fixed to a part of a wire rope 18 like the vertical divided photographing mask 9, and is connected to a driving motor 12 by a driving pulley 14, a driven pulley 16, and both pulleys 14, 16. The position of the X-ray irradiation field 3 and the position retracted therefrom (the position indicated by the two-dot chain line in FIG. 4) are configured to be movable by the wire rope 18 looped around. As shown in FIG. 4, the divisional imaging masks 9 and 10 are formed of a substance having a large X-ray absorption such as a lead plate large enough to cover the entire surface of the X-ray film 20. Among them, the upper and lower divisional photographing mask 9 is one of the vertical dimensions of the X-ray film 20.
/ 2 size window (a portion in which a lead plate is cut out so that X-rays can be transmitted) is provided. It has a window (the same as above). As shown in FIG. 4, both masks 9, 10
Is moved into the irradiation field 3, the irradiation field becomes half the size of the X-ray film 20 in the upper, lower, left and right directions. Therefore, FIG.
The four-division shooting as shown in FIG. FIG. 6A shows a photograph of the entire mask 9 and 1.
0 is performed at the retracted position (the position indicated by the two-dot chain line in FIG. 4), and the left and right two-division imaging shown in FIG. 6B can be performed by setting only the mask 10 in the irradiation field 3, and FIG. 2 can be performed by setting only the mask 9 in the irradiation field 3. In the three-division imaging shown in FIGS. 6E, 6F, 6G, and 6H, the respective masks 9 and 10 are shown in FIG.
It is possible to set and retreat in combination with the positions in the photographing shown in (b), (c) and (d). However, according to the above-mentioned prior art, two types of masks (a vertically divided photographing mask 9 and a left and right divided photographing mask 1) are provided in the divided photographing mask mechanism.
0) and 2 dedicated to each mask, ie, independent of each other.
System mask drive system (drive motors 11 and 12, drive pulleys 13 and 14, driven pulleys 15 and 16, wire rope 1
7, 18) and its control system, which raises the problem of increasing the cost and increasing the size. An object of the present invention is to realize a divided photographing mask mechanism with two types of divided photographing masks, a single system of a mask driving system and a control system thereof, and the structure can be reduced in size and cost can be reduced. An object of the present invention is to provide an X-ray fluoroscopy table that can be achieved. An object of the present invention is to provide a rapid-access shooting case having a built-in X-ray film, and a pair of divided imaging masks arranged on the main surface of the rapid-accessing shooting case on the X-ray source side.
A moving mechanism for moving the pair of divided imaging masks between an X-ray irradiation area and an area other than the X-ray irradiation area along a guide member; the moving mechanism includes a driving pulley, a driven pulley, An X-ray comprising an endless rope wound around a driving pulley and a driven pulley, and a part of the rope fixed to one of the sides parallel to the moving direction of the pair of divided imaging masks. in fluoroscopic imaging table, the pair of split imaging mask, respectively, the divided
The vertical dimension of the back side of the photographic mask is at least
U-shaped that is greater than or equal to the vertical dimension of the
The U-shaped openings provided in each of the split photography masks
The vertical dimension of the U-shaped opening is 1 of the vertical dimension of the entire photographing size.
/ 2 and the horizontal dimension of the U-shaped opening is
Size is at least half of the horizontal dimension of the
Thus, the guide member moves the masks from a predetermined position A where the back sides of the masks face each other at an interval equal to or larger than the horizontal dimension of the entire photographing size with the opening sides of the respective openings facing each other. After the masks approach each other and further intersect, both openings overlap in a horizontal direction between A and B to a predetermined position B which forms one rectangular window having a horizontal dimension of the upper and lower divided photographing size. It guides you alternately and freely,
The rope is fixed to the two masks so that the two masks can be alternately moved by moving the rope to one or the other, forms an endless end via the two masks, and is connected to the drive pulley. The two ropes are moved alternately by running the rope to one or the other through the, and stop when the two masks are at a predetermined position between the positions AB by a signal from a control unit. This is achieved by providing a drive motor for setting a lateral dimension of a desired photographing size. The two masks are separated from each other at a predetermined position A where the back sides of the masks face each other with an interval equal to or greater than the horizontal dimension of the entire photographing size with the opening sides of the respective openings facing each other. After approaching each other and further intersecting, both apertures overlap to form a square 1 having the horizontal dimensions of the upper and lower two-part shooting size.
It is guided by a guide member so as to be alternately movable in the lateral direction between AB and a predetermined position B where one window is formed. The endless rope is fixed to both masks, and moves the masks alternately by running on one or the other. The drive motor runs the endless rope through the drive pulley to move both masks alternately.
Then, both masks are moved to positions AB by a signal from the control unit.
It stops when it reaches a predetermined position in between. At this time, a horizontal dimension of a desired photographing size is set. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a main part (a part of a mask mechanism for divided imaging) of an embodiment of an X-ray fluoroscopic imaging table according to the present invention. In FIG. 1, reference numeral 6 denotes a snapshot case 6 as in FIGS. 3 and 4. Reference numerals 101 and 102 denote masks for divisional photography, each having a vertical dimension and a horizontal dimension which are の of a vertical dimension 2H and a horizontal dimension 2W of the entire photographing size, that is, H × W U-shaped openings. 101A, 102A, and the vertical dimension on the back side (non-opening side) is at least the vertical dimension 2H of the entire photographing size.
The above is almost U-shaped. A guide member (not shown) is provided on both masks 10.
1 and 102, with the opening sides of the openings 101a and 102a facing each other as shown in the figure, with the back side facing away from the illustrated position A where the full size 2H × 2W and the horizontal dimension 2W are opposed. , Both masks 101 and 102
Approach each other and cross again, then both openings 101
A and 102a are alternately movable in the lateral direction between A and B which reach a predetermined position B where a single window WD1 having a horizontal dimension 2W of an upper and lower split photographing size and having a horizontal dimension of 2W is formed. Therefore, this guide member is provided with a step in the X-ray axis direction. Reference numeral 103 denotes an endless wire rope, which is run on one or the other to form the two masks 101,
The two masks 101 and 1 can be moved alternately.
02, and has no termination via both masks 101 and 102. Although an endless rope (annular rope) can be used in practice, there is no necessity to use an endless rope in operation. In this case, even when the endless rope is actually used, both masks 101 and 102 are used. It is said that there is no end through. A drive motor 104 has an output shaft connected to a drive pulley 105, and drives the wire rope 103 to one or the other through the drive pulley 104 to move the masks 101 and 102 alternately. The two masks 101 and 102 are operated by a signal from a unit (not shown).
Stops when a predetermined position (C, D) between the positions AB is reached, and the horizontal dimensions 2W, W, W / 2 of the desired photographing size are obtained.
Set. Reference numeral 106 denotes a driven pulley, which includes a driving pulley 105 and an endless wire rope 103 wound around the driving pulley 105, and the masks 101 and 102
A moving mechanism is configured to move along the guide member between a line irradiation region and a region other than the X-ray irradiation region. 107 is an X-ray irradiation field. Next, the operation of the X-ray fluoroscopy table having the above-described structure, more specifically, the operation of the mask mechanism for divided radiography will be described with reference to FIGS. 6 and 2 showing various radiograph sizes. In the case of the entire photographing size shown in FIG. 6A, as shown in FIG. 2A, the masks 101 and 102 are positioned and set at a position (based on the mask back position; the same applies hereinafter) A. And the masks 101 and 102 are at the farthest positions. That is, it is located at a position separated by an entire width 2W of the X-ray film (not shown). It should be noted that the masks 101 and 102 shown by solid lines in FIG. From this state, the drive motor 101 is driven to move the endless wire rope 103 counterclockwise in FIG. 1 (in the direction of arrow A), and the masks 101 and 102 are moved by W / 2 in the direction approaching each other. When moved, the position is set to the position C (see FIG. 2B) that is close to W on both sides, and the size becomes the left and right two-division photographing size in FIG. 6B. It should be noted that the masks 101 and 102 shown by two-dot chain lines in FIG. Subsequently, the endless wire rope 103 is moved in the same direction (the direction of arrow A), and the masks 101 and 102 are moved.
Are moved in the approaching direction by 3W / 2 (= 1.5W), respectively (that is, crossed), and the position D (see FIG. 2 (c))
, The openings 101a and 102a of both masks 101 and 102 overlap to form one rectangular window WD2 having a lateral dimension W. That is, FIG.
The four-division shooting size of (d) is obtained. Further, it is moved W / 2 in the same direction,
(See FIG. 2 (d).) When positioning is set, the window WD
One rectangular window WD1 having a lateral dimension of 2W and a lateral dimension of 2W is formed. That is, upper and lower 2 in FIG.
The divided shooting size is obtained. The three-division shooting sizes shown in FIGS. 6E to 6H can be easily realized by combining the above-described operations for obtaining the shooting sizes of FIGS. 6B to 6D. At this time, since the X-ray irradiation center position is constant, the X-ray film is sent so that the imaging center position of the X-ray film coincides with the X-ray irradiation center position according to the setting of the imaging size.
Positioning is the same as in the prior art. The maximum amount of movement of both masks 101 and 102 is 2W + (W / 2) = (5W) / 2, assuming that the full width dimension (lateral dimension) of the X-ray film (not shown) is 2W. The guide member and the drive motor 101 are adapted to this.
(Not shown) is configured. In the above embodiment, the masks 101, 10
2. The dimensions and the amount of movement of the openings 101a and 102a are theoretical values, and the actual dimensions require a wrap of several mm in order to complete the X-ray shielding ( In particular, when the photographing size of FIG. 2D is obtained. Further, since the X-ray films are separated from the masks 101 and 102, the X-ray irradiation field through the masks 101 and 102 is slightly enlarged on the X-ray film. For this reason,
Actually, the dimensions and the moving amount are set to appropriate dimensions in consideration of the enlargement. In the above embodiment, the masks 101, 10
Although the wire rope 103 was used for the movement of 2, the rope may be made of another material. Further, a chain or a belt may be used instead of the rope, but in the present specification, for the sake of convenience, a rope or the like includes a chain or a belt. As described above, according to the present invention, a divided photographing mask mechanism can be realized by two kinds of divided photographing masks, a single mask driving system, and a control system thereof. There is an effect that the structure can be downsized and the cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a main part of an embodiment of an X-ray fluoroscopy table according to the present invention. FIG. 2 is a view for explaining the operation of the X-ray fluoroscopic table; FIG. 3 is a cross-sectional view schematically showing a main part of a conventional X-ray fluoroscopic table. FIG. 4 is a perspective view showing the rapid-moving apparatus and the mask mechanism for divided photographing in FIG. 3; 5 is a diagram showing a cross section taken along line XX in FIG. 4 from the direction of the arrow. FIG. 6 is a view showing various photographing sizes by a divided photographing mask mechanism. [Explanation of Signs] 1 X-ray tube 2 Aperture device 3 X-ray irradiation field 4 Subject 5 X-ray tube support device 6 Case of flash photography device (flash photography case) 7 Tables 8A, 8B Table support frame 9 For vertical split photography Mask 10 Mask for left and right division photography 11 Mask drive motor for top and bottom division photography 12 Mask drive motor for division photography 13 and 14 Drive pulleys 15 and 16 Follower pulleys 17 and 18 Driving wire rope 19 Film holder 20 X-ray films 21 and 22 Guide members 101, 102 Divisional imaging masks 101a, 102a Opening 103 Endless wire rope 104 Drive motor 105 Drive pulley 106 Follower pulley 107 X-ray irradiation field

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61B 6/00-6/14

Claims (1)

(57) [Claims] 1. A quick-action case incorporating an X-ray film.
Placed on the main surface on the X-ray source side of the
A pair of divided photographing masks and a pair of divided photographing masks
Between the X-ray irradiation area and the area other than the X-ray irradiation area.
And a moving mechanism for moving along the guide member.
The moving mechanism consists of a drive pulley, a driven pulley,
Equipped with an endless rope wrapped around the
And a part of this rope is
Are fixed to one of the sides parallel to the direction of disk movement.
In the X-ray fluoroscopy table SaidFor paired split shootingThe masks are eachFor split shooting
The vertical dimension on the back side of the mask is at least
U-shape that is larger than the size, and the pair of divided photography
The U-shaped opening provided in each of the masks for
The vertical dimension of the shape opening is half of the vertical dimension of the entire shooting size
And the horizontal dimension of the U-shaped opening is
It is at least half the size of the horizontal dimension, The guide member holds the two masks at their respective openings.
With the mouth facing the other side, the rear side is fully photographed.
Predetermined positions facing each other with an interval larger than the horizontal dimension of the shadow size
From A, after the two masks approach each other and cross each other,
The two openings overlap and the horizontal dimension of the upper and lower split shooting size
A- reaching a predetermined position B forming one rectangular window having
B guides so as to be able to move alternately in the lateral direction between B, The rope allows it to travel on one or the other
The two masks are moved so that the two masks can be alternately moved.
Is fixed to the end, and is unterminated through both masks. Connected to the drive pulley, through which the front
Run both ropes on one or the other to bring both masks forward.
The staggered movement and the signal from the control unit
When both the masks are at predetermined positions between the positions AB
To stop and set the horizontal dimensions of the desired shooting size
An X-ray fluoroscopy table comprising a motor.