JPH0334049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray film contact device for holding an X-ray film in close contact with an intensifying screen in a spot shot type X-ray diagnostic apparatus.

A spot shot type X-ray diagnostic device is a device that holds an X-ray film taken out from a film magazine with an X-ray film adhering device, sends it together with this X-ray film adhering device to a predetermined This is a device that images an X-ray transmitted image of a predetermined part of a subject on an X-ray fluoroscopic imaging table onto the X-ray film. As an X-ray film contact device built into such a spot shot type X-ray diagnostic apparatus, for example, the one shown in FIG. 1 has been conventionally used. This is connected to a pair of parallel rails (not shown) provided inside a spot shot type X-ray diagnostic device (not shown) via a guide roller 2 provided in a frame 1 having an It is supported so that it can freely reciprocate along the A first intensifying screen 3 is provided on the frame 1 so as to cover the X-ray passage hole 1a. Further, a substrate 4 slightly smaller than the first intensifying screen 3 is provided on the frame 1 via a pair of hinges 5 so as to be openable and closable in the directions of arrows A and B. A second intensifying screen 7 is attached to the substrate 4 by sandwiching a sponge rubber 6 of approximately the same size as the substrate 4, and is integrally constructed. In order to hold an X-ray film (not shown) to be inserted between the second intensifying screen 7 and the first intensifying screen 3 in pressure contact with these intensifying screens 3 and 7, One end of a pair of spring steel bars 8 is attached to the opening/closing end of the board 4, and the other end is engaged with a holder 9 provided on the side wall 1b of the frame 1, so that the board 4 is always attached in the direction of arrow B. Forced. Further, a pair of guide rollers 11 are provided near the spring steel rod 8 via a pair of holders 10 .

Such an X-ray film adhesion device opens the substrate 4 in the direction of arrow A against the biasing force of the spring steel rod 8, and connects the first intensifying screen 3 and the second intensifying screen 7. An X-ray film is inserted between them, and this X-ray film is held under pressure by the intensifying screens 3 and 7. Generally, the X-rays are amplified by the upper and lower intensifying screens that are pressed against the X-ray film. In the method of exposing an X-ray film, the X-ray film must be uniformly brought into close contact with an intensifying screen in order to make the X-ray image sharp over the entire surface of the X-ray film. Therefore, as described above, the guide roller 10 provided on the substrate 4 is pushed by the guide (not shown) provided inside the spot shot type X-ray diagnostic apparatus (not shown), so that the substrate 4 is moved. As it is rotated in the direction of arrow B, the elastic deformation of the sponge rubber 6 interposed between the substrate 4 and the second intensifying screen 7 causes the X-ray film (not shown) and the intensifying screens 3, 7 to This means that they are in close contact with each other. Note that the spring steel rod 8 prevents uneven adhesion due to rising of the opening and closing ends of the substrate 4.

However, in such an X-ray close contact device, there are problems such as warpage and uneven flatness of the substrate due to variations in machining accuracy, deflection of each intensifying screen when pressed together, and other problems such as hinges and spring steel rods. Because the amount of elastic deformation of the sponge rubber becomes uneven due to variations in processing accuracy and ease of assembly, it is not possible to bring the entire surface of the X-ray film into close contact with the intensifying screen with a uniform pressing force. There is a drawback that a sharp X-ray image cannot be obtained over the entire surface, and in general, when elastic rubber exceeds the proportional region as shown in Figure 2, the pressing force increases exponentially with respect to the amount of deflection, so the substrate If an attempt was made to forcibly increase the degree of adhesion by strongly pressing the entire surface, the fluorescent coating of the intensifying screen would yellow and deteriorate, resulting in a disadvantage that the life of the device would be significantly shortened.

The present invention has been made based on the above-mentioned circumstances, and is capable of closely adhering an intensifying screen to an X-ray film over the entire surface thereof with a substantially constant pressing force, and furthermore, it is possible to prevent yellowing and deterioration of the fluorescent coating film of the intensifying screen. X that can prevent
The object of the present invention is to provide a wire film adhesion device.

The present invention will be described with reference to embodiments shown in the drawings. 3 is a partially cutaway perspective view showing an embodiment of the present invention, FIGS. 4a and 4b are a plan view and a sectional view of a rubber cushion used in this embodiment, and FIG. 5 is an enlarged sectional view of the rubber cushion. FIG. 7 is a schematic explanatory diagram of the same embodiment. In each figure, the same reference numerals as in FIG. 1 indicate the same members, and detailed explanation thereof will be omitted. In a configuration different from that shown in FIG. 1, an elastic body such as a rubber cushion 20 having a plurality of hollow protrusions arranged therein is attached between the second intensifying screen 7 and the substrate 4 using an appropriate means such as adhesive. That's what I did. As shown in FIG. 4, for example, this rubber cushion 20 has a plurality of rubber protrusions 20a arranged uniformly on a rubber flat plate part 20d and integrated by heat welding or the like. 5
As shown in the figure, the upper end is a circular plane with an outer diameter D ₁ = 5 mm, and the lower part of this outer edge is a gentle hem composed of a circular arc with a constant radius R = 3.5 mm, and the inside is a circular plane with an outer diameter D 1 = 5 mm. It consists of a hollow part consisting of a truncated cone-shaped recess 20c with an outer diameter D ₂ = 4 mm, an outer diameter D ₃ of the lower base = 8 mm, and a height H ₂ = 2.3 mm, and a plurality of air vent holes 20b communicating with the recess 20 c. and each protrusion 2
Thickness from the upper end of 0a to the lower surface of flat plate part 20d
H ₁ =4.9mm is constant. It has been experimentally revealed that this rubber cushion 20 has an elastic relationship as shown in FIG. That is, the pressing force P acting on the upper end of the protrusion 20a in FIG. 5 and the height dimension H ₁ caused by the action of this pressing force P.
In relation to the amount of shrinkage (hereinafter referred to as the amount of deflection δ), in the range of the amount of deflection δ from approximately 0.3 mm to 1.2 mm, the pressing force does not change rapidly as the amount of deflection δ increases, and is almost constant. A steady value of around 60 g (such an almost steady pressing force will be referred to hereinafter as saturated pressing force) can be maintained (such characteristics will hereinafter be referred to as saturated pressing force characteristics). From this, the seventh
As shown in the figure, the rubber cushion 20 has a protrusion 2
The upper end of 0a is in contact with the substrate 4, and the flat plate part 20d is in contact with the second intensifying screen 7.
It is provided integrally with the intensifying screen 7. Then, by rotating the substrate 4 in the direction of arrow B via the hinge 5, the X-ray film F inserted between the first intensifying screen 3 and the second intensifying screen 7 is exposed to 3,
7 are brought into close contact with each other, the first intensifying screen 3 and the substrate 4 are parallel, and the amount of deflection δ of the rubber cushion 20 is approximately 0.7 mm (hereinafter δ = 0.7 mm is referred to as the reference deflection amount). A hinge 5 is provided.

In the X-ray film adhesion device configured as described above, the guide roller 10 provided on the substrate 4 is pushed by a guide (not shown) provided inside the spot shot type X-ray diagnostic device (not shown). As a result, the substrate 4 is rotated in the direction of arrow B, and the elastic deformation of the rubber cushion 20 interposed between the substrate 4 and the second intensifying screen 7 causes the first intensifying screen 3 and the second intensifying screen 7 to be rotated. Each intensifying screen 3,
7 is closely attached. In particular, since the rubber cushion 20 has a saturation characteristic of the pressing force in a specific deflection region, local warpage or deflection occurs in each intensifying screen 3, 7, and the deflection amount δ for each protrusion 20a becomes the reference deflection amount δ= Even if there is a variation of about ±0.4 mm from 0.7 mm, the X-ray film F is held in close contact with each intensifying screen 3, 7 with a substantially constant pressing force P=60 g over the entire surface.

The rubber cushion used in the above embodiments is merely an example, and the rubber cushion is not limited to this as long as it has a saturation characteristic of pressing force in a specific deflection region. Further, the above embodiment is merely an example, and it goes without saying that each member can be replaced with another member having the same function.

Since the present invention is configured as described above, the intensifying screen can be brought into close contact with the entire surface of the X-ray film with a substantially constant pressing force, and there is no fear of yellowing and deterioration of the fluorescent coating of the intensifying screen. This has excellent effects such as being able to provide an X-ray film close contact device that can obtain sharp X-ray images over the entire surface of the X-ray film.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional X-ray film adhesion device, Fig. 2 is a graph showing the relationship between the pressing force and the amount of deflection of the sponge rubber used in the device, and Fig. 3
4a and 4b are plan views and sectional views of the rubber cushion used in this embodiment, and FIG. 5 is an enlarged sectional view and sectional view of the rubber cushion used in this embodiment. FIG. 6 is a graph showing the relationship between the pressing force and the amount of deflection of the rubber cushion, and FIG. 7 is a schematic explanatory diagram of the device. 1a... X-ray passage hole, 1... Frame, 2... Guide roller, 3... First intensifying screen, 4... Substrate, 5
...Hinge, 7...Second intensifying screen, 8...Spring steel bar, 9...Holder, 10...Holder, 11...Guide roller, 20...Rubber cushion, 20a...
...protrusion, 20b...air vent hole, 20c...recess, 20d...flat plate part.

Claims (1)

[Claims] 1. Insert an X-ray film between a first intensifying screen and a second intensifying screen that are provided so as to be able to move toward and away from each other; In an X-ray film adhesion device that presses and holds an The first intensifying screen or the second intensifying screen is pressed through the elastic body, and the first intensifying screen or the second intensifying screen is pressed through the elastic body. An X-ray film adhesion device characterized in that the X-ray film is brought into close contact with the X-ray film.