JPH0723292A - X-ray observation device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an I. I. The purpose is to easily align the center of the fluorescent screen with the optical axis of the lens and the center of the image pickup device of the television camera. [Arrangement] In an X-ray observation apparatus, a television camera or an apparatus for processing signals of the television camera,
I. When playing on a monitor. I. It has a built-in means for generating a circle blanking larger than the fluorescent screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to generation of circle blanking in a television camera or an apparatus for processing signals from the television camera, which is combined with an X-ray observing apparatus.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a general X-ray observation apparatus. 5 is an X-ray source, 6 is an object to be observed, 7
Is an X-ray image intensifier (also known as image intensifier, abbreviated as II below), 8 is an I.I.7 phosphor screen,
Reference numeral 9 is a lens, 10 is a television camera, 11 is a device for processing television camera signals, and 12 is a monitor. The operation of FIG. 4 will be described. The X-rays emitted from the X-ray source 5 pass through the subject 6, are converted into visible light by I.I.7, and become a light image on the fluorescent screen 8. The light passing through the lens 9 is converted into a normal television signal by the television camera 10, and the X-ray fluoroscopic image of the subject 6 can be viewed on the monitor 12 via the television camera signal processing device 11.
The television camera signal processing device 11 is omitted,
The television signal of the television camera 10 may be directly input to the monitor 12.

[0003]

In the X-ray observing apparatus as shown in FIG. 4, the I.I.7 phosphor screen 8 is generally circular, and a circular reproduced image is observed on the monitor 12. I.
The center of the phosphor screen 8 of I.7 is often not at the mechanical center of the I.I.7. In this case, the center of the phosphor screen 8 and the optical axis of the lens 9 ( The centers of the image pickup devices (not shown) and the television camera 10 are not aligned. Therefore, in such a case, the fluorescent screen 8 is reproduced unevenly on the monitor 12. FIG. 5 is a schematic view of a monitor screen when the fluorescent screen 8 is reproduced in a biased manner. Therefore, conventionally, when the X-ray observation apparatus is installed, the center of the phosphor screen 8 of II, the optical axis of the lens 9 and the center of the image pickup element of the television camera 10 are observed while observing the screen of the monitor 12. In addition, the fluorescent screen 8 is prevented from being reproduced unevenly. However, since the aspect ratio of the screen of the monitor 12 is often 3: 4 and there is no circular clue, it is difficult to align the circular reproduced image of the phosphor screen 8 with the center of the screen. An object of the present invention is to eliminate these drawbacks and to make it very easy to align the center of the phosphor screen of II with the optical axis of the lens and the center of the image pickup device of the television camera. .

[0004]

In order to achieve the above object, the present invention provides a fluorescent screen of I.I. when reproduced on a monitor in a television camera or a device for processing signals of the television camera. It is larger and incorporates means for generating circle blanking around the center of the monitor screen.

[0005]

As a result, by comparing the circle of the circle blanking generated with the circle of the phosphor screen, the center of the phosphor screen of II, the optical axis of the lens, and the center of the image pickup element of the television camera are extremely determined. Can be easily adjusted.

[0006]

FIG. 1 shows an embodiment of the present invention, in which the center of the phosphor screen 8 of I.I.7, the optical axis of the lens 9 and the television camera 1 are used.
9 shows a monitor screen when the center of the image sensor of 0 is aligned. 1 is a monitor screen having an aspect ratio of 3: 4, 2 is a circle blanking generated from a circle blanking generating means (not shown) built in the television camera 10 or the signal processing device of FIG. Set so that the center coincides with the center of circle blanking 2. No. 3 is no signal at the outer circumference of circle blanking 2.
(Black) part, and 4 is an I.I.7 phosphor screen image reproduced on the monitor. FIG. 2 shows a monitor screen when the center of the fluorescent screen 8 is deviated from the optical axis of the lens 9 and the center of the image pickup device of the television camera 10. Hereinafter, this operation will be described. Since the outer peripheral portion 3 has no signal, the installer of the X-ray observation apparatus looks at the image inside the circle blanking 2. If the fluorescent screen 8
If the center of the circle is deviated from the optical axis of the lens 9 and the center of the image pickup element of the television camera 10, the direction and distance of the deviation can be determined by comparing the edge of the circle blanking 2 and the edge of the phosphor screen image 4, It is possible to easily align the center of the fluorescent screen 8 with the optical axis of the lens 9 and the center of the image pickup device of the television camera 10.

FIG. 3 shows another embodiment of the present invention in which the diameter of the circle of the circle blanking 2 is larger than the vertical dimension of the monitor screen 1. In the normal case, the fluorescent screen image 4 is arranged so that the lens 9 fits within the vertical dimension of the monitor screen 1.
In this case as well, most edges of the circle of the circle blanking 2 are displayed in the monitor screen, and the center of the fluorescent screen 8, the optical axis of the lens 9 and the television camera 10 are selected. The shift of the center of the image sensor can be determined. Here, since the method of generating the circle blanking 2 itself has already been implemented in the X-ray observation apparatus and is well known, description thereof is omitted. Further, it is obvious that the circuit for generating the circle blanking 2 may be built in the television camera 10 or the television camera signal processing device 11. The present invention is effective when the X-ray observation apparatus is installed, and it is not always necessary to incorporate the means for generating the circle blanking 2 in the television camera 10 or the television camera signal processing apparatus 11, and after the installation, You can remove all or part of the generating means, or if you have a built-in microcomputer, you can use the circle blanking software 2 only when installing.
May be generated.

[0008]

According to the present invention, in a television camera combined with an X-ray observing device, the center of the phosphor screen of II, the optical axis of the lens and the center of the image pickup device of the television camera can be aligned very easily. be able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a monitor screen according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a monitor screen according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a monitor screen according to an embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a general X-ray observation apparatus.

FIG. 5 is a schematic diagram showing a monitor screen when the fluorescent screens are installed unevenly.

[Explanation of symbols]

 1 Monitor screen 2 Circle blanking 4 I.I. phosphor screen image reproduced on the monitor 5 X-ray source 7 I.I.8 I.I.7 phosphor screen 9 Lens 10 Television camera 11 Television camera Signal processor 12 monitor

Claims (1)

[Claims] 1. An X-ray observation apparatus comprising means for generating circle blanking, which is larger than the fluorescent screen image of the X-ray image intensifier and is centered on the center of the monitor screen. apparatus.