JPS5895726A - X-ray image forming device - Google Patents

Abstract

PURPOSE:To form >=2 kinds of X-ray images having each different quality, on an image receiving body, by simple constitution, by placing a means for giving a transmission characteristic which is different from X-ray transmission characteristics, in an advancing path, and superposing and forming X-ray images having plural qualities. CONSTITUTION:At each instantaneous time of irradiation of X-rays, X-rays irradiate a person to be inspected, from both parts A, B of a disk 11, and it is repeated alternately in the course of an operation time. Subsequently, the quality is alternated in order, X-rays which have transmitted the person to be inspected P energize sensitizing screens 3 and 5, emit fluorescent light, and expose a sheet film 15 from before and behind, therefore, on the film, an image on which X-rays passing through the part A have been indicated clearly, and an image which has passed through the part B and on which X-rays having different qualities have been indicated clearly are superposed and formed. An X-ray film obtained in this way becomes equal to that which is superposed a photograph exposed by 2 kinds of X-rays having each different quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray transmission image recording device, and more particularly to a diagnostic device that multiple-exposes the same receiver to at least two types of X-rays of different radiation quality.

Below, we will first explain the conventional direct X-ray recording method, and then
The present invention will be explained. In FIG. 1, the IFi X-ray tube is connected to a voltage supply source 1c (not shown).

P indicates the subject. 2 is a front intensifying screen, 4 is a sheet film for direct photography coated with emulsion on both sides, and 5 is a rear intensifying screen. When X-rays are emitted from the X-ray tube 1 in this arrangement, the X-rays that have passed through the subject 2 are converted into fluorescent light to which the film is sensitive by the intensifying screens 3 and 5, and are exposed on the film 4. Examiner P's X
It forms a gap that spreads through the total amount of transmitted light and exposes the film.

On the other hand, when X-ray photography is performed, the X
The X** lines appearing on the film differ depending on the quality of the lines. For example, when exposed to so-called hard X-rays, tissues such as bones are clearly visible, but soft tissues are crushed and cannot be seen. Furthermore, when soft X-rays are applied, tissues such as bones cannot be seen, but the photograph shows the soft tissues themselves. Therefore, if a photograph showing both Xl1K radiation with different radiation quality could be obtained, it would be extremely useful for diagnosis.

The method shown in FIG. 2 was announced as having this advantage. In the figure, 1' is an XII tube supplied with single-phase full-wave rectification, 5 is a first intensifying screen, and 6 is a first sheet film coated with emulsion only on its upper surface. Further, 7 is black paper, 8 is a metal foil such as lead that has a filtering effect, 9 is a second intensifying screen, and IO is a second sheet film of the upper surface emulsion.
These 5 to 100 members are placed closely together and face-to-face.

When X-rays are irradiated with the above arrangement, the X-rays that pass through the subject P
The lines are converted into fluorescent light by the first intensifying screen 5 and form lines on the first sheet film 6. The black paper 7 is provided so that the fluorescent light is not reflected by the metal foil 8 placed behind the paper and returned to the first sheet film 6. Nl intensifying screen 5,
x passed through the first sheet film 6 and the black paper 7;
The radiation is attenuated by the i*Fi metal foil 8, and the quality of the radiation is changed by filtering to dialyze the unnecessary wavelength range, and the second intensifying screen 9
, where it is converted into light that the film is sensitive to. However, although Km is formed on the second sheet film 10 by this light, this image is an image in which a portion that did not appear in the image formed on the first sheet film 6 appears.

For example, if the same X-ray exposure amount is the same as in the device shown in Figure 1, the same patient is
When photographing with the apparatus shown in FIG. 2, approximately half the amount of emulsion is applied compared to the conventional film, and the contrast of the first and second films of the ninth film is approximately half that of the conventional one. However, if you stack the existing film, you will get a picture with a contrast of 91, which is about the same as X** produced by the apparatus shown in Figure 1, and two pictures of me with two different radiation qualities are superimposed.

However, in the case of an X1m photographing device, if a large number of sheets of film are to be photographed in a short period of time, and a large number of members are overlapped as shown in Figure 2, the process of overlapping and releasing these members will complicate the equipment. sum up Alternatively, when a thin image receptor such as a sheet film is not used, for example, when it is desired to form an image on an image intensity fire (1, I) tube, K is difficult to realize.

An object of the present invention is to realize a device with a simple structure, or to make it applicable to various observation and photographing devices.

FIG. 3 shows an embodiment of the invention.

A single-phase full-wave rectified voltage is applied to the No. 11 Fi X-ray tube. In the t2Fi filtering disk, as shown in the plan view in FIG. 4, divided sections are lined up in a layered manner from the center, and adjacent sections A and B have different X-ray transmission characteristics. A part of this disk 120 is placed across the path of the X-rays, and parts with different X-ray transmission characteristics are placed on an acrylic or aluminum plate with metal foil made of lead, tungsten, etc. can be made. 13ij
It is a high-speed rotating motor, and its rotating shaft is connected to the disc 12 to rotate the disc 12, and the rotational speed of the disc is determined so that it rotates many times during the X-ray exposure time.

14 is a front intensifying screen, 15 is a sheet film coated with emulsion on both sides, and 16 is a rear intensifying screen, which are superimposed and placed close to the subject PK. With the above configuration, when the motor 13 is driven and the rotation of the disk 12 reaches a steady state, when power is supplied to the X-ray tube 11 and X-rays are emitted, the instantaneous EX-rays during the Xl1l exposure time are Disk 1
The patient P is exposed to X-rays through part 1, and the next moment the patient is exposed to nine X-rays with a different radiation quality from part B. , this is repeated alternately during the operating time. The quality of the rays is then alternated, and the X-rays that have passed through the subject P excites both intensifying screens 3 and 5 to generate fluorescent light, which exposes the sheet film 15 from the front and back. Therefore, on the film, there is a superimposed image of the area that is clearly represented by the X-rays that have passed through the part B and the line that is clearly represented by the X-rays that have passed through part B and have a different radiation quality.

The X-ray film thus obtained is the same as nine photographs exposed by two types of X-rays of different ray quality, which are superimposed.

In this embodiment, the disk is divided into two parts, but if it is divided into even more parts, a superimposed image of nine photographs taken with various types of X-rays of different radiation quality can be obtained. Alternatively, one fan-shaped part on the disc may emit an X-ray tube, pass +XS until that point, and the other part may block a specific wavelength range of X-rays, or each part may have a metal foil pasted on one side. By appropriately changing the area ratio of the portions where the values are different or larger, it is possible to change the density ratio of the superimposed photographs, and it is possible to obtain photographs useful for special diagnosis. Note that the filtering means is not limited to a disk; the flat plate may be inserted into and removed from the X-ray path by reciprocating at high speed.The embodiment described above applies the present invention to direct X-ray imaging. This is an example of X@<Ra indirect photography, X-ray 1.1. Indirect shot, X? @Can be applied to electronic photography, etc.

According to the present invention, an image formed by two or more types of X-rays with different radiation pressures can be formed on the same injured body without requiring a complicated structure, and it is also possible to record images on a photographic film. This has the advantage of making subsequent handling easier.

[Brief explanation of drawings]

1 and 2 are side views showing a conventional example, FIG. 3 is a side view showing an embodiment of the present invention, and FIG. 4 is a plan view of the constituent members. In the figure, 11 is an X-ray tube, 12 is a filtering disk, 1
3 is a motor, 14 is a front intensifying screen, 15 is a sheet film, 16 is a rear intensifying screen, and parts A and B FiX@ have different transmission characteristics.

Claims (1)

[Claims] (1) X-rays are irradiated, transmitted through the subject, and placed on the light-receiving surface of the receiver using 9Xi/mK or via a converter that converts the X-rays into light that the receiver is sensitive to. In a device that forms an image of a subject, a rounding means that gives a transmission characteristic different from that of the emitted X-ray is placed in the path of the X-ray, and X** of multiple ray qualities can be X@Lin image forming device (2) characterized in that the X@Rin image forming device (2) is formed in a superimposed manner. Claim 1, wherein the providing means is a fan-shaped portion extending from a rotation shaft coupled to a rotation driver. (3) The X-ray image forming apparatus according to claim 2, characterized in that the areas of the fan-shaped portions and the adjacent fan-shaped portions are varied. (4) The X-ray image forming apparatus according to claim 1, wherein the providing means is arranged closer to the X-ray generating means than the subject.