JPH0271248A - X-ray radiographic equipment - Google Patents

Abstract

PURPOSE:To prevent an X-ray radiophotographing camera from colliding against a floor to break down by providing a means which detects the turning state of the X-ray radiophotographing camera set to an optical distributor and preventing a supporting base from moving at the time of placing the X-ray radiographing camera in a film replacing device position. CONSTITUTION:A block 22 detained by a barrel part 6 which is set to an optical distributor 4 and is not turned is provided with a reflection plate 23 which reflects the transmission light emitted from a photodetector 19. Since the photodetector 19 is arranged on the turning side and the reflection plate 23 is arranged on the non-turning side in this case, the photodetector 19 and the reflection plate 23 have positional relations where angular positions are shifted from each other by 90 deg. in this film replacing and loading position. Therefore, the transmission light emitted from an LED of the photodetector 19 is not reflected by the reflection plate 23, and a photo transistor of the photodetector 19 is kept turned off, and the motion of a supporting base 1 is inhibited. Thus, trouble that the supporting base is moved to break down the X-ray radiophotographing camera is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an X-ray photographing apparatus for recording an X-ray transmitted fluorescent image whose brightness has been amplified by an image intensifier on an X-ray film.

[Prior art] In mass examinations or adult disease examinations conducted to find patients with cancer diseases etc. from an unspecified number of examiners,
In order to reduce the X-ray exposure dose for subjects undergoing diagnosis through radiography, the transmitted image formed with a small X-ray dose is amplified in brightness using an image intensifier tube, and this light image is observed on a television monitor. When a desired image is displayed, devices are widely used that switch from a television monitor to an X-ray camera to take the image.

FIG. 11 is an example of an indirect photograph of the back during examination for adult diseases.

X-rays are irradiated from an X-ray tube 2 to a subject S lying on a support table 1. The irradiated X-rays pass through the subject S, are amplified in brightness by an image intensifier 3, are distributed to a television camera 5 by a light distributor 4, and an image is displayed on a television monitor (not shown). When the desired image is obtained, the X-ray image is taken by an X-ray camera 7 attached via a lens barrel 6 to the opposite side of the optical distributor 5 from the image intensifier 3, and an internal film is taken. recorded in In normal frontal radiography, the support stand 1 is rotated as shown in AA' to record six to seven X-ray images.

In such an X-ray imaging apparatus, the floor is placed from the top of the support base 1 so that the patient S can easily move up and down the support base 1, and so that the X-ray technician can easily adjust the body position of the patient S. It is desirable that the distance to the surface is about 700 to 750 mm. However, due to physical limitations of the image intensifier 3, light distributor 4, photographic camera 7, etc., the current situation is that it is not always possible to obtain a height that makes it easy to ascend and descend. In order to shorten the distance p between the floor surface and the support stand 1, the conventional example has a disadvantage in that the space between the back cover 7a for film exchange and the support stand 1 becomes narrow, making it difficult to load and exchange films.

In order to improve this drawback, when attaching the photographing camera 7 to the light distributor 4, the film exchange back cover 7a should be directed downward in FIG. 1 has to be made longer, which becomes an obstacle when the subject S is raised and lowered and when the X-ray radiographer adjusts the body position of the subject S.

Therefore, in the conventional example, it is necessary to remove the photographing camera 7 from the light distributor 4 every time the film is replaced.

Therefore, in the X-ray photographing apparatus of Japanese Patent Application No. 62-217131, the present inventor inverted the support stand l as shown in FIG. Place the camera 7 on the back cover 7a around the optical axis.
By rotating the back cover 7a of the camera camera 7, the back cover 7a of the camera camera 7 faces the wide space opposite to the support stand 1, making it easy to load and replace film, and also to reduce the distance between the floor and the support stand l when shooting film. We are proposing a shortened X-ray imaging device.

[Problems to be Solved by the Invention] In FIG. 12, in order to return to the shooting state after changing the film loading, the camera 7 must be rotated in the opposite direction around the optical axis to the shooting position. and rotate the support base l in the A' force direction to change it from an inverted state to a parallel state.

However, if you forget to turn the photographing camera 7 to the photographing position after replacing the film loading and move the support stand 1 in the direction shown in FIG. There is a drawback that the photographing camera 7 is damaged due to the collision.

[Object of the Invention] The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a means for detecting the rotational state of the X-ray camera attached to the light distributor, and to detect when the X-ray camera is in the film exchange loading position. An object of the present invention is to provide an X-ray imaging device that prevents an X-ray imaging camera from colliding with the floor and being damaged by preventing the support stand from moving at certain times.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide a support for supporting a subject, an X-ray tube disposed on one side of the support to generate X-rays, and a support for the support. an image intensifier tube arranged on the other side to amplify the X-ray transmitted image transmitted through the subject; a light distributor which distributes the output image of the image intensifier tube; and an image intensifier tube connected to one side of the light distributor. A television camera, an X-ray camera connected to the other side of the light distributor and rotating by a predetermined angle with respect to the light distributor to exchange film, and detecting the rotational position of the X-ray camera. An X-ray imaging apparatus characterized by comprising a rotation detection means and a means for inhibiting movement of the support base when the X-ray camera is rotated based on a detection signal from the rotation detection means.

[Embodiments of the Invention] The present invention will be described in detail based on embodiments illustrated in FIGS. 1 to 10. Note that the same reference numerals as in FIGS. 11 to 13 indicate the same members.

FIG. 1 is a front view of the X-ray camera 7 in the imaging state;
Figure 82 shows the photographic camera 7 in the rotating film loading/exchanging position.
, the photographing camera 7 is rotatable about the optical axis between the lens barrel section 6 and the photographing camera 7. Note that film replacement is performed by opening the back cover 7a in this state. By moving a lever 10 provided on the lens barrel section 6 in the direction of the arrow shown in FIG. 1, the connection between the camera 7 and the lens barrel section 6 can be loosened or tightened. Photographing camera 7 when photographing with photographing camera 7 and when changing film
positioning with respect to the lens barrel section 6 is possible. Note that 12 indicates a hanging holder for the photographing camera 7.

Fig. 3 is a partial view of the connecting part seen from the direction of arrow A in Fig. 1;
4 is a partial view seen from the direction of arrow B in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. 3. The rotation shaft 10a of the lever 10 is screwed into one of two clamping ends 13a and 13b of a clamping member 13 provided on the lens barrel section 6,
A cylindrical portion 14 on the photographing camera 7 side is fitted into the tightening member 13 . The tightening member 13 and the cylindrical portion 14 are rotatable relative to each other when no tightening force is applied to the tightening member 13, but even in that case, there is no accidental rotation. A considerable amount of frictional resistance is applied to its rotation to prevent it from turning. In addition, a positioning mechanism 1 is provided on the photographing camera 7 side.
1, a protruding pin 15 operated by a spring is provided, and this pin 15 is inserted into pin holes 17a or 17b provided in positioning pieces 16a and 16b, respectively, arranged at two corners of the lens barrel section 6. It's starting to get into the. Further, the pin 15 is provided with a pin lever 15a, and by operating this pin lever 15a, the pin 15 is inserted into the pin hole 1.
It can be pulled out from 7a or 17b. Furthermore, a photodetector 19 serving as position detection means for the photographing camera 7 is provided inside the back cover 18 of the photographing camera 7 on the rotating side. This photodetector 19 consists of an LED as a transmitting part and a so-called reflective phototransistor as a receiving part.The back cover 18 is provided with a hole 20 through which the emitted light and received light of the photodetector 19 pass. A light shielding plate 21 is provided around the detector 19 to prevent light from entering the camera 7 through the hole 20 . A block 2 attached to the optical distributor 4 and locked to the lens barrel part 6 on the non-rotating side
2 is provided with a reflecting plate 23 for reflecting the transmitted light emitted from the photodetector 19.

At the photographing position in FIG.
The transmitted light emitted from the ED passes through the hole 20 of the back cover 18, is reflected by the reflection plate 23 provided on the block 22, passes through the hole 20 again, and is guided to the phototransistor of the photodetector 19, where the phototransistor turns on and the shooting position is detected.

Next, in order to rotate the photographing camera 7 as shown in FIG.
a to pull it out from the pin hole 17a, rotate the lever 10, widen the gap d between the slots between the clamping ends 13a and 13b, and loosen the clamping member 13. It can be rotated clockwise relative to the section 6. Rotate the shooting camera 7 by 90' and turn the shooting camera 7
When the camera is turned toward the film loading/exchanging position, the pin 15 enters the pin hole 17b provided in the positioning piece 16b by a spring force. Then, rotate the lever lO and tighten the tightening member 13.
The cylindrical portion 14 on the photographing camera 7 side may be tightened by the following steps. In this state, as shown in FIG. 12, the back cover 7a of the photographing camera 7 faces toward a wider space, so that film can be easily loaded and replaced.

In this case, since the photodetector 19 is placed on the rotating side and the reflecting plate 23 is placed on the non-rotating side, the positional relationship between the photodetector 19 and the reflecting plate 23 is The relationship is such that the angular position is shifted by 90'. Therefore, the transmitted light emitted from the LED of the photodetector 19 is transmitted to the reflection plate 23.
Therefore, the phototransistor of the photodetector 19 remains off, and it is detected that the photographing camera 7 is not at the photographing position, that is, the support stand 1 must not be moved. Therefore, in this embodiment, the photodetector 19
When the phototransistor is off, movement of the support stand 1 is prohibited, and when it is on, movement of the support stand 1 is allowed.

Then, in order to use it for photography again, move the photography camera 7 in the reverse order so that it is oriented as shown in FIG. The phototransistor is guided to the phototransistor of the detector 19, and the phototransistor is turned on to detect that the photographing camera 7 is in the photographing state position.

In this embodiment, a reflection type photosensor is used as the photodetector 19, but it may also be constructed using a transmission type photosensor and a chopper. Furthermore, as a matter of course, in order to reduce the influence of external light, it is desirable to use a phototransistor that is sensitive to infrared rays.

Figure 6 shows the control block circuit diagram of this device, and shows the support stand l.
The movement of is controlled by a support controller 24. Further, the photographing camera 7 is controlled by a camera controller 25 to advance film and the like. Further, the camera controller 25 is connected to the support stand controller 24, and sends and receives signals such as power supply and film advance.

Further, the support stand l may be provided with a device having a sheet film photographing mechanism (not shown).

In general, sheet film photography is used for detailed medical examinations and the like because it has a higher exposure dose but has superior drawing power, compared to indirect photography using an image intensifier tube 3 and has a lower exposure dose, and is called direct photography. When performing sheet film photography using this device, power is often not supplied to the camera controller 25 shown in FIG. 6. In other words, at this time, the photodetector 19 provided in the photographing camera 7 is not energized, so as shown in Table 1 below, the phototransistor of the photodetector 19 is not energized when the photodetector 19 is not energized. It is always turned off regardless of the position, and the rotating position of the photographing camera 7 cannot be detected.

Table 1: Energized state Photographing camera Phototransistor energized
Shooting position: ON When energized Film exchange position: OFF when not energized Shooting position OFF when not energized Film exchange position OFF This is an example in which the seventh
The figure shows the photographing position. A reed switch 26 is provided on the back cover 18 on the rotating side as a means for detecting the position of the photographing camera 7, and a magnet 27 is provided on the block 22 on the non-rotating side. FIG. 8 is a partially enlarged view of the position detection means of the photographing camera 7 shown in FIG. ing.

The contacts 26a and 26b of the reed switch 26 are each magnetized, and due to the magnetic force of the magnet 27, they come into contact with each other and become electrically conductive. That is, regardless of whether the position detecting means of the photographing camera 7 is energized or de-energized, the reed switch 26 is
The contacts 26a and 26b are in contact with each other, and the position of the photographing camera 7 in the photographing state is detected. Next, when the photographing camera 7 is rotated by the same operation as described above, the positional relationship between the reed switch 26 and the magnet 27 is disrupted, and the contacts 26a and 26b are separated and become non-conductive.

In this way, by configuring the detection means using the reed switch 26 and the magnet 27 as the detection means, the position of the photographing camera 7 can be detected even when the camera controller 25 is not energized, that is, when the position detecting means of the photographing camera 7 is not energized. becomes possible. Furthermore, since the material of the back cover 18 is a non-magnetic material, the magnetic force of the magnet 27 is detected by a photodetector 19 as a detection means.
There is no need to provide a hole 20 in the back cover 18 as is the case when using a 2000, which has the advantage of facilitating light shielding and simplifying the structure.

Figure 9 and Figure 1O show the reed switch 26 and magnet 2.
FIG. 9 shows the X-Y characteristics when the contacts 26a, 26b of the reed switch 26 and the magnetic flux of the magnet 27 are parallel, and the position of the magnet 27 is When it reaches between -S-8, contact 26a
, 26b are in contact, and the contact 26 is in contact between S-T and -3 to -T.
This shows that the contact points 26a and 26b are kept in contact with each other, and when they are removed from T and T, the contacts 26a and 26b are separated. In this way, when the magnetic fluxes of the contacts 26a, 26b and the magnet 27 are parallel, the contacts 26a, 26b are parallel to each other at the reference point O.
b are in contact with each other, and exhibit characteristics that are symmetrical about the reference point O.

On the other hand, FIG. 10 shows the X-Y characteristics when the magnetic fluxes of the contacts 26a, 26b of the reed switch 26 and the magnet 27 are perpendicular to FIG. 9, and in this case, the reference point O This shows a characteristic in which the contacts 28a and 26b do not touch each other, but instead touch at two slightly shifted locations. Therefore, in the case of this embodiment, the magnetic flux directions of the contacts 26a, 26b of the reed switch 26 and the magnet 27 are parallel to each other, as in the case of FIG. It is desirable to configure the magnet 27.

In the present embodiment, the detection means is composed of the reed switch 26 and the magnet 27, but even if the detection means is composed of a so-called microswitch and a running top, the detection means can be energized or de-energized as described above. The rotating state of the photographing camera 7 can be detected. However, the photographing camera 7 can be rotated both clockwise and counterclockwise, and a simple configuration using a microswitch and a landing top often causes problems in terms of directionality.

Therefore, in order to provide a detection means with a simple structure and high reliability, it is desirable to use a non-contact type position detection means as in this embodiment. Based on the signal detected in this manner, the movement of the support base 1 is prohibited when the photographic camera 7 is rotated and is not in the photographing state, that is, when the film is replaced.

[Effects of the Invention] As explained above, the X-ray imaging apparatus according to the present invention is provided with a rotation detection means for detecting the rotational position of the X-ray imaging camera which is rotatable with respect to the light distributor, and By inhibiting the movement of the support when the imaging camera is rotated, when the X-ray imaging camera is rotated and is in the film loading/exchange position,
This eliminates the possibility of damaging the X-ray camera by moving the support stand. In addition, when the rotation detection means is energized,
If the rotational state can be detected in any state in which power is not supplied, the rotational state can be detected even when no power is supplied to the X-ray camera, which has the advantage of higher safety.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the X-ray imaging apparatus according to the present invention, FIG. 1 is a front view of the X-ray imaging camera in the imaging state, and FIG. 2 is a front view of the imaging camera in the rotated state. Rear view, 3rd
The figure is a partial view of the connecting part seen from the direction of arrow A in Figure 1.
The figure is a partial view seen from the direction of arrow B in Figure 3, and Figure 5 is a partial view of the
A cross-sectional view taken along the line V-V in the figure, and FIG. 6 is a control block circuit diagram. FIG. 7 is a configuration diagram of a detection means using a reed switch, FIG. 8 is a partially enlarged view of the detection means, FIG. 9 and FIG.
12 is a configuration diagram of a conventional x111 imaging device, FIG. 12 is a configuration diagram of a film exchange state, and FIG. 13 is an explanatory diagram of an interference state between an X-ray camera and a floor. Symbol l is the support stand, 2 is the X-ray tube, 3 is the image intensifier tube, 4
is a light distributor, 5 is a television camera, 6 is a lens barrel, 7 is an X-ray camera, 10 is a lever, 11 is a positioning unit,
15 is a pin, 18 is a back bar, 19 is a photodetector, 23 is a reflector, 26 is a reed switch, and 27 is a magnet.

Claims (1)

[Claims] 1. A support stand that supports the subject, an X-ray tube placed on one side of the support stand to generate X-rays, and an X-ray tube placed on the other side of the support stand to capture the X-ray image transmitted through the subject. an image intensifier for amplifying; a light distributor for distributing an output image of the image intensifier;
a television camera connected to one side of the light distributor; an X-ray camera connected to the other side of the light distributor and rotating by a predetermined angle with respect to the light distributor to exchange film; It is characterized by comprising a rotation detection means for detecting the rotation position of the imaging camera, and a means for inhibiting the movement of the support base when the X-ray imaging camera is rotated based on a detection signal from the rotation detection means. X-ray imaging equipment.