JPS59185490A - X-ray television device - Google Patents

Abstract

PURPOSE:To prevent the drop of a picture quality of a magnified monitor picture by switching the deflection size in the vertical direction of an image pickup means and the horizontal deflection size of a display means by a switching control means. CONSTITUTION:In case of magnifying the deflection size of a TV monitor 10, the deflection size in the vertical direction of a TV camera 7 is reduced by the first deflection size switching means 12 controlled by a switching control means 20. At the same time, the deflection size in the horizontal direction of the TV monitor 10 is magnified by the second deflection size switching means controlled by the switching control means 20.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention converts an X-ray image obtained by irradiating X-rays into an optical image, further converts it into an electrical signal, and then displays the image. The present invention relates to an X-ray television device.

[Technical background of the invention and its problems]

The configuration of a conventional X-ray television device is shown in FIG.

In FIG. 1, first, X-rays emitted from an X-ray generator 2 controlled by an X-ray controller j pass through a subject 3 and a bed device 4. The X-ray image obtained by transmitting the X-rays is converted into an optical image by an image intensifier 5, and then passed through an optical system 6 to an x7B fluoroscopic television camera (hereinafter referred to as "TV camera"). The image is formed on an image pickup tube 8 housed in 7. The image pickup tube 8 is a TV
Based on the optical image focused by the action of the deflection coil 90 housed in the camera 7, an electrical signal (electrical signal) is output. The data is input to a monitor (referred to as a "monitor") 10 and displayed as an image, and is also input to an arithmetic processing unit 11 where various arithmetic processes are performed.

Next, a case will be described in which the display image on the TV monitor 10 is enlarged in the conventional X-ray television apparatus described above.

Conventionally, as a method of enlarging the displayed image on the TV monitor 10, the deflection current flowing through the deflection coil 9 of the TV camera 7 is switched by the deflection current switching means 12, thereby reducing the fluorescence generated at the output section of the image intensifier 5. How to change the polarization size of an image, or the polarization size of a TV monitor horizontally.

A method of vertically enlarging the TV is used.
A method for switching the deflection current flowing through the deflection coil 9 of the camera 7 using the deflection current switching means 12 will be described.

Figure 2 shows an aspect ratio of 1. :1, FIG. 3 is an explanatory diagram showing a method for switching the deflection size of a TV camera in the case of an aspect ratio of 4:3. In Figures 2 and 3, (a) shows the case of standard deflection size, and (b) shows the case of TV
A case is shown in which the deflection size of the camera is reduced, and as a result, the displayed image (letter "A") on the TV monitor is enlarged.

Furthermore, FIGS. 4(a) and (b) are similar to FIGS. 3(a) and (b).
) is shown. In FIGS. 2 to 4, reference numeral 13 indicates the output surface of the image intensifier, and reference numeral 14 indicates the deflection size of the TV camera.

First, in the case of an aspect ratio of 1:1, it does not match that of normal X-ray film (aspect ratio of 4:3), so the image shown in Figure 2 (a)
Even in the case of the standard deflection size, and in the case of the enlarged deflection size shown in FIG. As a countermeasure to this problem, when the aspect ratio is set to 4:3 as shown in FIG. 3, when performing image calculation processing by sampling the video signal.

There is a problem that requires changing the sampling frequency. To explain this using FIG. 4, the video effective time of the video signal 18 is ta in the case of FIG. 4(a).

In the case of (b) in the same figure, from tb and 7, the sampling frequency when sampling this with the same sampling number aN is: In the case of (a)... Ta = -a In the case of (b) ......Tb=-b, and it becomes necessary to change the sampling frequency in each case of (a) and (b).

Next, in the method of expanding the deflection size of the TV monitor 10 in the horizontal and vertical directions, in the case of the standard deflection size shown in FIG.
, and if the number of scanning lines 17 is set to N, the enlarged deflection size (b) shows that the deflection size 15 is equal to the image frame 1.
6, the number of scanning lines 17 in the effective screen of the TV monitor IO becomes less than N, and as a result, the scanning line spacing becomes wide, resulting in the problem of lowering the image quality and the problem of T
There are disadvantages such as the need to increase the vertical deflection power of the V monitor.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an X-ray television device that can enlarge a monitor image without degrading the image quality, and can easily perform sampling and calculation processing. shall be.

[Summary of the invention]

The outline of the present invention for achieving the above object is to perform optical image pressure conversion on an X-ray image obtained by irradiating X-rays, convert this into an electrical signal by an imaging means, and then convert it into an electric signal by a display means. In an X-ray television apparatus for displaying images, a first deflection size switching means for switching a deflection size in a vertical direction in the imaging means, and a second deflection size switching means for switching a deflection size in a horizontal direction in the display means. The present invention is characterized in that it includes a switching means and a switching control means for controlling these deflection size switching elements.

[Embodiments of the invention]

Next, an embodiment of the present invention will be described with reference to one field.

FIG. 6 is a block diagram, not showing an apparatus according to an embodiment of the present invention.

In FIG. 6, the X-ray generator 2. The bed device 4 and the image intensifier 5 each have an X-ray control device 1
The arrangement is such that the X-rays emitted from the X-ray generator 2 controlled by the A TV camera 7 is arranged.

The TV camera 7 houses an image pickup tube 8 and a deflection coil 9, and the output of the TV camera 7 is input to a TV monitor 10 and an arithmetic processing unit 11. On the other hand, the first deflection size switching means 12- and the second deflection size switching means 12- controlled by the switching control means 20
The outputs of the deflection size switching means 19 are respectively input to the deflection coil 9 and the TV monitor 10 serving as a display means.

Here, the first deflection size switching means 12 is capable of switching the deflection size in the vertical direction of the TV right camera, and the second deflection size switching means is capable of switching the deflection size of the TV right camera in the vertical direction.
It is possible to switch the horizontal deflection size at the first . The operation timing and size gain of the second deflection size switching means are controlled (in this embodiment, the first deflection size switching means).
The operation timings of the second deflection size switching means are switched almost simultaneously -0 Next, FIG. 7 is an explanatory diagram showing an enlargement of the display image of the embodiment device shown in FIG. The figure (a) shows the TV monitor 10.
This shows that the deflection size 15 in the vertical direction of the TV camera 7 is the standard, and that it also matches the image frame 16. FIG. further reduce the horizontal deflection size of the TV monitor 1°
By enlarging 5 from the standard, the display image [letter "A"
”] is expanded.

Next, the operation of the apparatus of this embodiment will be explained with reference to FIG.

In FIG. 6, first, X-rays emitted from an X-ray generator 2 controlled by an X-ray controller 1 pass through a subject 3 and a bed device 4. The X obtained by this X-ray transmission
After the w is is converted into an optical image by an image intensifier 5, the image is formed on an image pickup tube 8 housed in a TV camera 7 via an optical system 6. The image pickup tube 8 is T
By the action of the deflection coil 90 housed in the V camera 7, a hunting signal based on the formed optical image is output, and this electric signal is manually inputted to the TV monitor 1o as a video signal.
While the image is displayed, it is input to the arithmetic processing unit 11, and after sampling processing, various arithmetic processing is performed.

Next, a case where a display image is enlarged will be described. The first deflection size switching means 12 controlled by the switching control means 20 reduces the vertical deflection size of the TV camera 7, and at the same time, the second deflection size switching means 19 controlled by the switching control means 20 reduces the vertical deflection size of the TV camera 7. When the horizontal deflection size of the TV monitor 10 is expanded, the seventh
The displayed image is enlarged as shown in Figure (b). Further, at this time, a part of the deflection size 15 that protrudes from the image frame 16 in the display image 1 of the TV monitor 10 is limited by the image frame 16, and therefore does not pose a particular problem.

Furthermore, since the horizontal deflection size of the TV camera 7 is constant before and after the display image is enlarged, the arithmetic processing unit 1
There is no need to change the sampling frequency during the sampling/arithmetic processing in 1. Also, TV monitor 10
Since the vertical deflection size of the display image is also constant before and after the enlargement of the displayed image, the TV monitor l after enlargement as in the conventional case.

The image quality does not deteriorate due to the widening of the scanning line spacing within the effective screen.

Although one embodiment of the device of the present invention has been described above, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment described above, the first and second deflection size switching means 12 and 19 were described as individually switching the deflection size in the vertical direction and the horizontal direction, respectively.
The same effect is not limited to this, but the same effect can be obtained by using both switching wedge means having both vertical and horizontal switching functions, and using the switching control means 20 to switch one only in the vertical direction and the other only in the horizontal direction. ? Obtainable.

〔Effect of the invention〕

As explained above, according to the present invention, when enlarging one display image, the horizontal deflection size of the TV right camera and the vertical deflection size of the TV monitor cannot be changed, so that the effective screen on the TV monitor cannot be changed. Accordingly, it is possible to provide an X+Wal television device in which there is no deterioration in image quality due to changes in the scanning line interval, and in which sampling and calculation processing are easy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional X-ray television device, and FIGS. 2(a) and (b) are a case in which the aspect ratio of the X# television device in FIG.
) and (b) are TVs with an aspect ratio of 4:3.
An explanatory diagram showing the camera deflection size switching method, Fig. 4 (a
) and (b) are explanatory diagrams showing the image signals in Figs. 3 (a) and (b), and Fig. 5 (a) and (b) are explanatory diagrams showing an example of a method for enlarging the deflection size of a TV monitor. Fig. 6 is a block diagram showing an embodiment of the device of the present invention, and Fig. 7 (a
) and (b) are explanatory diagrams showing an enlargement of a display image of the embodiment device shown in FIG. 6. 12... first deflection size switching means, 19...
Second deflection size switching means, 20...Switching control means. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] After converting the X-ray image obtained by irradiating X-rays into an optical image and converting this into an electrical signal by an imaging means 1
In an X-ray television apparatus that displays an image by a display means, a first deflection size switching means for switching a deflection size in a vertical direction in the imaging means, and a second deflection size switching means for switching a deflection size in a horizontal direction in the display means. An X-ray television apparatus comprising a switching means and a switching control means for controlling the deflection size switching means.