JPS6327697Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an X-ray television device, and more specifically to an X-ray television (hereinafter referred to as
It concerns TV equipment.

X-ray TV equipment usually receives an X-ray beam that has passed through the object onto the input surface of an image intensifier (I/I), and sends the image formed on the output surface to the target of the image pickup tube of a television camera via a lens system. The image is formed into an image and displayed on the CRT monitor surface. As a method for changing the direction of the X-ray image on the monitor surface, an up-down reversal as shown in Fig. 1 is used, in which the polarity of the voltage applied to the vertical deflection coil and the horizontal deflection coil around the image pickup tube is reversed. , and an X-ray TV apparatus having a left-right reversal function as shown in FIG. 2 is currently in use.

However, in the case of an X-ray TV system mainly used for surgery, in which the X-ray source and the X-ray TV system are arranged facing each other by a C-shaped or U-shaped arm, and the subject is placed in the arm, Vertical and horizontal reversals alone as described above are not practically satisfactory; instead, vertical and horizontal rotations can be performed continuously with the image center at the center of the image while maintaining an angle of 90 degrees to each other.
Moreover, it is required to freely rotate by any angle. There are the following three methods to achieve this, but they have various problems and are not practical.

(1) Image intensifier, lens system,
The entire device combined with the TV camera is rotated about its long axis.

(2) Rotate the combination of lens system and TV camera.

(3) Rotate only the TV camera.

Since the method (1) above rotates the entire device, these rotation mechanisms are large-scale and expensive.
Smooth operation cannot be expected and it is not practical. (2), (3)
Although the method (1) has a smaller configuration than the case (1), it is still not sufficient, and since the lens system and TV camera are moved, there is a risk that the image will be out of focus, so it is still not practical.

SUMMARY OF THE INVENTION An object of the present invention is to provide an X-ray TV apparatus equipped with a small and easy-to-operate rotation mechanism capable of rotating a displayed X-ray fluoroscopic image by any angle around the center of the display.

Therefore, the present invention achieves the above object by making the coil assembly of the image pickup tube, which constitutes the camera section of the X-ray device, rotatable around the axis of the image pickup tube, and by rotating it using a motor drive mechanism. This has been achieved.

Hereinafter, one embodiment of the X-ray TV apparatus according to the present invention will be described in detail with reference to FIGS. 3 and 4.

FIG. 3 shows the overall configuration of the X-ray TV device, in which 1 denotes an image intensifier (hereinafter abbreviated as I.I), which emits radiation from the X-ray tube 2 and targets the subject 3. A visible light image of the subject 3 is focused on the target I.I1 by the transmitted X-ray beam 4. 5 indicates the camera, I.
An image pickup tube 7 having an optical lens 6 at a connecting portion with I1 and converting the target image into an electrical video signal inside, is disposed on the outer periphery of the axis of the image pickup tube 7,
It has a coil assembly 8 including vertical and horizontal deflection coils. Furthermore, as shown in the enlarged view of FIG. 4, the end of the coil assembly 8 is provided with a pinion gear 11 attached to a ring gear 9 and a rotating shaft 10 that meshes with the ring gear 9. The coil assembly 8 is arranged so that it can rotate. A monitor 12 is electrically connected to the image pickup tube 7 and displays the visible light image based on the video signal and synchronization signal from the camera 5. 13 is camera 5
A connection cable 14 between the camera 5 and the monitor 12 is a camera control device that mainly controls the rotational drive of the coil assembly 8 in the camera 5.

Next, FIG. 4 shows an enlarged view of the camera 5, which is the main part of the present invention, and will be described in detail. The optical lens 6 and the image pickup tube 7 are mounted on the fixed base 1 so that the images of I and I1 are focused on the target of the image pickup tube 7.
5. Disposed on the outer periphery of the image pickup tube 7 are horizontal and vertical deflection coils, a focus coil,
A coil assembly 8 consisting of an alignment coil is fixed to a support tube 16. This support tube 16
is rotatably held on a fixed base 15, whereby each coil of the coil assembly 8 is connected to the image pickup tube 7.
It is designed to be able to rotate around the central axis. Further, a ring gear 9 is fitted and fixed to the end of the support tube 16 on the side of the fixed base 15.
A pinion gear 11 that meshes with is rotatably held on a fixed base 15 and fixed to a rotating shaft. Reference numeral 17 indicates a servo motor having a speed reducer and a rotation angle detection mechanism, and its drive shaft is connected to the rotating shaft 10.

According to the X-ray TV apparatus configured as described above, when the displayed image on the monitor 12 is vertical as shown in FIG. 5, if it is desired to display the image on the monitor in an inclined state as shown in FIG. By operating the motor drive switch 18 of the camera control device 14, the servo motor 17 is rotationally driven, and the coil assembly 8 is driven through the rotation shaft 10 by the meshing of the pinion gear 11 and the ring gear 9. Rotate the surrounding area by the desired angle. As the coil assembly 8 rotates, the displayed image on the electrically connected monitor 12 is displayed tilted by an angle corresponding to the rotation angle of the coil assembly 8, as shown in FIG. Ru.

This makes it easy to display images at arbitrary angles, which is especially required for C-shaped or U-shaped arm X-ray imaging devices.Moreover, there is no need to rotate the lens system or TV camera, which eliminates out-of-focus images. There is no problem. Furthermore, since the rotation can be controlled continuously, it is greatly useful for diagnosis of X-ray images.

In addition, although the above description describes the case where a servo motor is used as the motor, the motor is not limited to this and a general induction motor may be used.

As is clear from the above embodiments, the X-ray TV device according to the present invention has a structure in which the coil assembly of the television camera can be rotated around the central axis of the image pickup tube, and the image on the monitor can be rotated by an arbitrary angle. This not only simplifies the configuration compared to conventional methods, but also eliminates the problem of out-of-focus screens, making it easier to diagnose images in X-ray photography, and increasing the degree of freedom in use. There are advantages and effects such as being able to

[Brief explanation of the drawing]

1 and 2 are monitor image diagrams for explaining an image inversion method in a conventional X-ray TV device, and FIGS. 3 and 4 show an embodiment of the present invention.
FIG. 3 is an overall configuration diagram of the X-ray TV apparatus, and FIG. 4 is a partially enlarged perspective view of FIG. 3, showing the internal configuration of the camera section. 5 and 6 are monitor images when the coil assembly is rotated to an arbitrary angle according to the present invention. 1...Image intensifier, 2...
X-ray tube, 3... Subject, 4... X-ray beam, 5...
...Camera, 6...Optical lens, 7...Image tube, 8
...Coil assembly, 9...Ring gear,
10... Rotating shaft, 11... Pinion gear, 12...
...Monitor, 13...Connection cable, 14...Camera control device, 15...Fixing stand, 16...
Support tube, 17... Servo motor.

Claims (1)

[Scope of utility model registration request] An image intensifier that creates a visible light image of the subject using X-rays that have passed through the subject, a television camera that converts the visible light image of the image intensifier into an electrical signal via an optical lens, and electricity from the camera. The television camera includes a monitor that reproduces the visible light image based on a signal, and a coil assembly that is rotatable about the central axis of the image pickup tube, and a drive mechanism that rotates the coil assembly. An X-ray television device comprising: