JPS649794B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an This invention relates to line television equipment.

[Technical background of the invention and its problems]

FIG. 1 shows the configuration of a conventional X-ray television apparatus.

In FIG. 1, 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-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 X-ray fluoroscopic television camera (hereinafter referred to as "TV camera"). ) 7 is imaged onto an image pickup tube 8 housed in the camera. The image pickup tube 8 outputs an electrical signal based on an optical image formed by the action of a deflection coil 9 housed in the TV camera 7, and this electrical signal is transmitted as a video signal to a television monitor for X-ray fluoroscopy ( (hereinafter referred to as "TV monitor")
10 and is displayed as an image, and is also input to an arithmetic processing unit 11 and undergoes various arithmetic processing.

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 amount of fluorescence generated at the output section of the image intensifier 5. How to change the image deflection size, or change the TV monitor deflection size horizontally or
A method of vertical expansion was used.

First, a method for switching the deflection current flowing through the deflection coil 9 of the TV camera 7 using the deflection current switching means 12 will be explained.

FIG. 2 is an explanatory diagram showing a method for switching the deflection size of a TV camera in the case of an aspect ratio of 1:1, and FIG. 3 in the case of an aspect ratio of 4:3. In Figures 2 and 3, a represents the case of standard deflection size, and b represents the case where the deflection size of the TV camera is reduced.
As a result, the display image (letter "A") on the TV monitor is enlarged. Furthermore, FIGS. 4a and 4b show the video signals in FIGS. 3a and 3b. In Figures 2 to 4, 13 is the output surface of the image intensifier;
4 is the deflection size of the TV camera.

First, in the case of an aspect ratio of 1:1, it does not match that of a normal X-ray film (aspect ratio of 4:3), so even in the case of the standard deflection size shown in Figure 2a, the same figure with this enlarged deflection size Even in case b, it looks unnatural. As a countermeasure to this problem, if the aspect ratio is set to 4:3 as shown in FIG. 3, there is a problem that the sampling frequency must be changed when sampling the video signal and performing image calculation processing. To explain this using Figure 4,
The video effective time of the video signal 18 is as shown in a of the same figure.
ta, in the case of b in the same figure, becomes tb, and the sampling frequency when sampling this with the same sampling number N is, in the case of a...Ta=N/ta, in the case of b...Tb=N/Tb, and a, b In each case it becomes necessary to change the sampling frequency.

Next, in the method of enlarging 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. Number of scanning lines: 17
Let N be the enlarged deflection size b in the same figure.
Since the deflection size 15 goes outside the image frame 16, the number of scanning lines 17 within the effective screen of the TV monitor 10 becomes N or less, which results in the problem of widening the scanning line interval and deterioration of image quality. This has drawbacks such as the need to increase the vertical deflection power of the TV 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 apparatus that can enlarge a monitor image without deteriorating the image quality, and that can easily perform sampling and arithmetic processing. shall be.

[Summary of the invention]

The outline of the present invention for achieving the above object is as follows:
In an X-ray television apparatus that converts an X-ray image obtained by irradiating radiation into an optical image, converts this into an electrical signal by an imaging means, and then displays the image by a display means, a first deflection size switching means for switching the deflection size in the vertical direction in the imaging means; a second deflection size switching means for switching the deflection size in the horizontal direction in the display means; and a switching control means for controlling the deflection size switching means. It is characterized by having the following.

[Embodiments of the invention]

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

FIG. 6 is a block diagram showing an apparatus according to an embodiment of the present invention.

In FIG. 6, an X-ray generator 2, a bed device 4
and an image intensifier 5, in which 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, and are transmitted to an image intensifier 5. An optical system 6 and a TV camera 7 serving as an imaging means are arranged at the rear stage thereof.
The TV camera 7 houses an image pickup tube 8 and a deflection coil 9, and the output of the TV camera 7 is sent to a TV monitor 10.
and is input to the arithmetic processing unit 11. On the other hand, the first deflection size switching means 12 and the second deflection size switching means 1 are controlled by the switching control means 20.
The outputs of 9 are respectively input to a deflection coil 9 and a TV monitor 10 serving as a display means. Here, the first deflection size switching means 12 is the TV camera 7.
The vertical deflection size of the TV can be switched, and the second deflection size switching means
The horizontal deflection size in the monitor 10 can be switched, and the switching control means 20 is adapted to control the operation timing and size gain of these first and second deflection size switching means (this In this embodiment, the operating timings of the first and second deflection size switching means are switched almost simultaneously.)

Next, FIG. 7 is an explanatory diagram showing an enlargement of the display image of the embodiment device shown in FIG.
This shows that the deflection size 15 of the monitor 10 is standard and coincides with the image frame 16,
In Figure b, the vertical deflection size of the TV camera 7 is smaller than the standard (Figure A), and the TV monitor 10 is
It is shown that the displayed image (letter "A") is enlarged by enlarging the horizontal deflection size 15 of the figure above the standard value.

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. In FIG. The X-ray image obtained by this X-ray transmission is converted into an optical image by an image intensifier 5, and then focused on an image pickup tube 8 housed in a TV camera 7 via an optical system 6. The image pickup tube 8 outputs an electric signal based on the optical image formed by the action of the deflection coil 9 housed in the TV camera 7. This electric signal is inputted as a video signal to the TV monitor 10, and the image is displayed. At the same time as being displayed, the data 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 switch controlled by the switching control means 20
The deflection size switching means 12 of the TV camera 7
At the same time, the vertical deflection size of
When the horizontal deflection size of the TV monitor 10 is enlarged by the second deflection size switching means 19 controlled by the switching control means 20, the displayed image is enlarged as shown in FIG. 7b. Further, at this time, a part of the deflection size 15 that protrudes from the image frame 16 in the image displayed on 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, there is no need to change the sampling frequency during sampling and arithmetic processing in the arithmetic processing unit 11. Furthermore, since the vertical deflection size of the TV monitor 10 is also constant before and after the display image is enlarged, the image quality deteriorates due to the scanning line spacing within the effective screen of the TV monitor 10 increasing after enlargement, as in the conventional case. I never do.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned 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 individually switch the deflection size in the vertical direction and the horizontal direction, but the present invention is not limited to this. The same effect can be obtained by using a device having both vertical and horizontal switching functions and using the switching control means 20 to switch only the vertical direction on one side and only the horizontal direction on the other side.

〔Effect of the invention〕

As explained above, according to the present invention, when the display image is enlarged, the horizontal deflection size of the TV camera and the vertical deflection size of the TV monitor are not changed, so that the scanning line within the effective screen of the TV monitor is There is no deterioration in image quality due to changes in the interval, and
It is possible to provide an X-ray television device that facilitates sampling and calculation processing.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional X-ray television apparatus, Fig. 2 a and b are the case where the aspect ratio of the X-ray television apparatus in Fig. 1 is 1:1, and Fig. 3 a and b are the aspect ratios. An explanatory diagram showing the method of switching the deflection size of a TV camera in the case of 4:3, Figures 4a and b are explanatory diagrams showing the video signals in Figures 3a and b, and Figures 5a and b are the deflection of the TV monitor. An explanatory diagram showing an example of a method for enlarging the size, FIG. 6 is a block diagram showing an embodiment of the device of the present invention, and FIGS. 7 a and b are explanations showing enlargement of a display image of the embodiment device shown in FIG. 6. It is a diagram. 12...first deflection size switching means, 19...second
deflection size switching means, 20...switching control means;

Claims (1)

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