JPS63181297A - X-ray fluoroscopy equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an X-ray fluoroscopic imaging device, and particularly to a technique that is effective when applied to an X-ray fluoroscopic imaging device capable of performing cine Xm imaging.

[Prior art]

The X-ray image transmitted through the object is converted into an optical image by an image intensifier, this optical image is captured by an X-ray television camera, the output signal is amplified by an amplifier, and the X-ray fluoroscopic image is displayed on a display device. In addition, the conventional X-ray fluoroscopic imaging apparatus is configured to take an output optical image of the image intensifier using a cine X-ray camera.
When performing radiography, first, prior to cine x1/iA radiography, the target region for cine
The X-ray fluoroscopy conditions for positioning (the tube current is smaller than the conditions for cine X-ray photography, and the amount of X-rays per hour is reduced) are set using the operating console 1.

Based on the set conditions, the X-ray controller 2
A fluoroscopic selection signal is sent to an X-ray television camera control section 9 consisting of a video signal amplifier 9A and an X-ray television camera controller 9B, and the X-ray fluoroscopy gain of the video signal amplifier 9A is selected. At the same time, a high voltage generated by the high voltage generator 3 based on the set X-ray fluoroscopy conditions is applied to the X-ray tube 4, and the subject 5 is irradiated with X-rays. The X-rays that have passed through the subject 5 are passed through an image intensifier (
Below, 1.1. )6, the image is converted into an optical image and output. This output optical image is transmitted to the distributor (
A spectrometer) 7 distributes and inputs the signal to an X-ray television camera 8 and a cine X-ray camera 11 for performing cine X-ray photography. The X-ray television camera 8 outputs an optical image as a video signal, and the X-ray fluoroscopic image is displayed on a display device 10 such as a television monitor through an X-ray television camera control section 9. This X
Determine the location of the target area for cine X-ray photography without looking at the fluoroscopic image.

The gain of the video signal amplifier 9A built in the X-ray television camera control section 9 of the X-ray television camera 8 is 1.
Usually, the configuration is such that a gain for perspective viewing is selected.

When the positioning of the site for cine X-ray photography is completed, the conditions for cine X-ray photography (the tube current is made larger than the fluoroscopy conditions for positioning, the X-ray dose per time is increased, and the output optical system of 1.1.6 is adjusted) (to brighten the target image) and start cine X-ray photography. At this time, as the gain of the video signal amplifier 9A is selected as the gain for X-ray fluoroscopy as described above, the output optical image of 1.1.6 is too bright.
Since the amplification of the video signal amplifier 9A becomes saturated, ■
.

An optical filter 13 for attenuating the light intensity of the output optical image of 1.6 is inserted in front of the X-ray television camera 8, and the
The ray controller 2 sends a signal consisting of the logical product of the cine X-ray imaging selection signal and the rotor rise signal to the X-ray television camera controller 9. At the same time, X-rays are irradiated from the X-ray tube 4,
The camera controller 12 for cine X-ray photography allows cine
The line photography camera 11 starts operating. The X-rays that have passed through the subject 5 are converted into an optical image in accordance with 1.1.6. The distributor 7 sends the converted optical image to a cine
It is distributed to the input to the radiography camera 11 and the input to the X-ray television camera 8. The cine X-ray camera 11 prints an optical image on cine film, and the X-ray television camera 8
A video signal is output and displayed on the display device 10.

[Problem that the invention seeks to solve]

However, in the conventional X-ray fluoroscopic imaging apparatus capable of performing cine X-ray imaging, the gain of the video signal amplifier 9 of the X-ray television camera 8 cannot be switched between the positioning X-ray fluoroscopy and the cine X-ray imaging. First, even during cine X-ray imaging, the gain used for positioning X-ray fluoroscopy is used, so the conditions for cine X-ray imaging are that the amount of X-rays per hour is higher than for Video signal amplifier 9A of the X-ray television camera 8 when recording on the display or recording device of
There was a problem in that the amount of light input to the X-ray television camera 8 had to be attenuated using an optical filter in order to use it with a gain of .

Furthermore, although the output signal of the X-ray television camera 8 is obtained within an appropriate range, since the gain of the video signal amplifier 9A is large, noise occurs between the light receiving section of the X-ray television camera 8 and the video signal amplifier 9A. Because it also emphasizes
Noise mixed into the X-ray image is noticeable, and the S of the X-ray image
There was a problem that /N deteriorated.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve
The object of the present invention is to provide a technique that can improve the S/N ratio of line images.

Another object of the present invention is to provide a technique that can display or record a cine X-ray image without using an optical filter during cine X-ray photography.

The above and other objects and novel features of the present invention are explained by the following description of the specification and the accompanying drawings.

[Means for solving problems]

A brief overview of typical inventions disclosed in this application is as follows.

In other words, an X-ray system that converts an X-ray image transmitted through an object into an optical image using an image intensifier, captures this optical image using an X-ray television camera, and amplifies the output signal using an amplifier for display or recording. The radiographic imaging apparatus is characterized in that a gain switch is provided for switching the gain of the video signal amplifier of the X-ray television camera in accordance with the X-ray irradiation mode.

[Effect]

According to the above-mentioned means, during X-ray photography such as cine X-ray photography, unlike during X-ray fluoroscopy for positioning, by reducing the gain of the video signal amplifier of the X-ray television camera,
Even if a large amount of light is input to the X-ray television camera, it operates to output an appropriate output signal, so the S/N ratio is improved without emphasizing the noise generated between the light receiving part of the X-ray television camera and the video signal amplifier. A good X-ray image can be obtained. Also,
This X-ray image with good S/N can be displayed or recorded without using an optical filter.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

Note that throughout the description of the embodiments, parts having the same functions are given the same reference numerals, and repeated explanations thereof will be omitted.

[Example I]

FIG. 1 is a block diagram showing a schematic configuration of an X-ray fluoroscopic imaging apparatus according to Embodiment I of the present invention.

FIG. 2 is a block diagram showing the configuration of a gain switch of the video signal amplifier shown in FIG. 1.

As shown in FIG. 1, the X-ray fluoroscopic imaging apparatus of this embodiment By making it smaller and reducing the amount of X-rays per hour, in the case of imaging,
Increase the tube current.

(increase the amount of X-rays per hour). Based on the positioning X-ray fluoroscopy or X-ray photography conditions set by the X-ray console 1, the X-ray controller 2 sends a positioning X-ray fluoroscopy or X-ray photography selection signal to the The signal is sent to the video signal amplifier 9A of the X-ray television camera control section 9, and also to the X-ray television camera controller 9B.

As shown in FIG. 2, the gain switch 20 includes a fluoroscopy gain setting register 21 in which a positioning X-ray fluoroscopy gain value is set, and a radiography gain setting register 21 in which an X-ray imaging gain value is set. A gain setting register 22 and a switch 23 for selecting and setting the positioning X-ray fluoroscopy or X-ray photography gain of the video signal amplifier 9A based on the positioning X-ray fluoroscopy or X-ray photography selection signal. It consists of As this switch 23, for example, a multiplexer is used.

Further, the high voltage generated by the high voltage generator 3 based on the set X-ray fluoroscopy or X-ray imaging conditions is applied to the X-ray tube 4, and the subject 5 is irradiated with X-rays. ing. The X-rays that have passed through the subject 5 are converted into an optical image by an image intensifier (hereinafter referred to as 1.1.) 6 and output. This converted optical image is captured by an X-ray television camera 8 and output as a video signal, and the X-ray photographed image is displayed on a display device 10 such as a television monitor through an X-ray television camera control section 9. As shown in FIG. 3, the data is recorded on a recording medium such as a magnetic hoop or a magnetic disk by a recording device 24 such as a video tape decoder.

Next, the X-ray imaging operation of Example I will be briefly described.

In FIGS. 1 and 2, first, prior to X-ray photography, the target area for X-ray photography is positioned using X-ray fluoroscopy. That is, the tube current is is set to a low X-ray dose per hour, and based on the set conditions, the X-ray controller 2 transmits the X-ray fluoroscopy selection signal for positioning to the X-ray transmitter via the gain switch 20. It is sent to the video signal amplifier 9A of the television camera control section 9 and also to the X-ray television camera controller 9B. Based on this positioning X-ray fluoroscopy selection signal, the switch 23 of the gain switch 20 reads out the value of the fluoroscopy gain setting register 21, and the video signal amplifier 9
A positioning X-ray fluoroscopy gain is selected. At the same time, a high voltage generated by the high voltage generator 3 based on the set X-ray fluoroscopy conditions is applied to the X-ray tube 4, and the subject 5 is irradiated with X-rays. The X-rays transmitted through the subject 5 are 1
．． 1.6, it is converted into an optical image and output. This output optical image is captured by an X-ray television camera 8, and an X-ray fluoroscopic image is displayed on a display device 10 such as a television monitor through an X-ray television camera control section 9. The position of the target area for cine X-ray photography is determined without looking at this X-ray fluoroscopic image.

When the positioning of the site for X-ray photography is completed, the X-ray photography conditions (the tube current is made larger than the positioning X-ray fluoroscopy conditions, the x mm per time is increased, and the output optical Based on the set conditions, the X-ray controller 2 sends an imaging selection signal to the video signal amplifier 9A of the X-ray television camera controller 9 via the gain switch 20. , is sent to the X-ray television camera controller 9B. Based on this X, S shooting selection signal, the switch 23 of the gain switch 20 reads out the value of the shooting gain setting register 22, and
The gain for radiography is selected. At the same time, a high voltage generated by the high voltage generator 3 based on the set X-ray imaging conditions is applied to the X-ray tube 4.

The subject 5 is irradiated with X-rays. The X-rays that have passed through the subject 5 are converted into an optical image and output according to 1.1.6. This output optical image is captured by an X-ray television camera 8,
The output video signal passes through the X-ray television camera control section 9 to display an X-ray photographed image on a display device 10 such as a television monitor, and also passes through the X-ray television camera control section 9 to a recording device 24 (third (see figure) is recorded on the recording medium.

As explained above, according to this embodiment, unlike during fluoroscopy, during X-ray imaging, by reducing the gain of the video signal amplifier 9A of the X-ray television camera 8, a large amount of light is transmitted to the X-ray television camera 8. Even if the light intensity is input, the video signal amplifier 9
Since A operates to output a proper output signal,
X with good S/N without emphasizing the noise generated between the light receiving part of the TV camera 8 and the video signal amplifier 9A.
A line image is obtained.

As a result, an X-ray image with good S/H can be displayed on the display device 10 or recorded on a recording medium by the recording device 24, and a digital subtraction angiograph using the output video signal of the X-ray television camera 8 can be used. Graphy (Di
digital 5ubtraction Angi.

This effect is particularly great in graphite (graph) devices.

[Example ■]

FIG. 3 is a block diagram showing a schematic configuration of an X-ray fluoroscopic imaging apparatus capable of performing cine X-ray imaging according to Embodiment 2 of the present invention.

The X-ray fluoroscopic imaging apparatus capable of performing cine X-ray imaging according to the present embodiment (2) is a construction of the X-ray fluoroscopic imaging apparatus according to the aforementioned embodiment (2).

A distributor (spectroscope) 7 is provided between 1.6 and the X-ray television camera 8, and the optical image converted in 1.1.6 is transferred to the X-ray television camera 8 and for cine X-ray photography by this distribution tough. The information is distributed to the camera 11 for input.

Next, the operation of the X-ray fluoroscopic imaging apparatus capable of performing cine X-ray imaging according to the present embodiment (2) when performing cine X-ray imaging will be briefly described.

In FIG. 3, first, prior to cine X-ray photography, the X-ray operating console 1 sets X-ray fluoroscopic conditions for positioning (the tube current is made smaller than the conditions for cine X-ray photography).

Based on the set conditions, the positioning X-ray
A fluoroscopic selection signal is sent to the X-ray television camera control section 9 consisting of a video signal amplifier 9A and an X-ray television camera controller 9B, and the
A line perspective gain is selected. At the same time, a high voltage generated by the high voltage generator 3 based on the set positioning X-ray fluoroscopy conditions is applied to the X-ray tube 4, and the subject 5 is irradiated with X-rays. The X-rays transmitted through the subject 5 are as follows: 1.1.
6, the image is converted into an optical image and output.

This output optical image is distributed and inputted to the X-ray television camera 8 and the cine X-ray camera 11 by a distributor tube. The X-ray television camera 8 outputs an optical image as a video signal, and the X-ray fluoroscopic image is displayed on the display device 10 through the X-ray television camera control section 9. The position of the target area for cine X-ray photography is determined without looking at this X-ray fluoroscopic image.

The gain of the video signal amplifier 9A built in the X-ray television camera control section 9 of the X-ray television camera 8 is
Usually, the configuration is such that the perspective gain is selected as described above.

After the positioning of the region in the cine X-ray image is completed, the conditions for cine X-ray photography (the tube current is made larger than the X-ray fluoroscopic conditions for positioning, and the X-ray dose per hour is increased, 1.1.
6), and based on the set cine X-ray imaging conditions, the X-ray controller 2 sends a cine imaging selection signal to X#l via the gain switch 20.
The signal is sent to the video signal amplifier 9A of the television camera control section 9, as well as to the X-ray television camera controller 9B and the cine X-ray camera controller 12. In response to this cine photography selection signal, the switch 23 of the gain switch 20 reads out the value of the cine photography gain setting register 22, and the cine photography gain of the video signal amplifier 9A is selected. At the same time, a high voltage generated by the high voltage generator 3 based on the set cine X-ray imaging conditions is applied to the X-ray tube 4, and the subject 5 is irradiated with X-rays. The X-rays that have passed through the subject 5 are converted into an optical image by +1.1.6 and output.

This output optical image is distributed and inputted to the X-ray television camera 8 and the cine X-ray camera 11 by a distributor tube. The output video signal of the X-ray television camera 8 is
Cine X is transmitted to the display device 10 through the television camera control section 9.
The line image is displayed and recorded on a recording medium by the recording device 24. Also.

The cine X-ray camera 11 prints the optical image onto a cine film.

As explained above, according to the present embodiment (2), unlike during positioning X-ray fluoroscopy, during cine X-ray imaging, by reducing the gain of the video signal amplifier 9A of the X-ray television camera 8, many Since the video signal amplifier 9A operates to output an appropriate output signal even with respect to the amount of input light,
A cine X-ray image with a good S/N ratio can be obtained without emphasizing the noise generated between the light receiving section of the X-ray television camera 8 and the video signal amplifier 9A.

As a result, a cine X-ray image with good S/N can be displayed on the display device 10.
It can be displayed on the screen or recorded on a recording medium using the recording bag W24. Furthermore, the present invention is particularly effective in a digital subtraction angiography apparatus that uses the output video signal of the X-ray television camera 8.

Above, the present invention was specifically explained using examples.
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As explained above, according to the present invention, at the time of xsm shadow,
Unlike during fluoroscopy, by reducing the gain of the video signal amplifier of the X-ray television camera, the video signal amplifier operates so as to output an appropriate output signal even with a large amount of input light. X-ray images with good S/H can be obtained without emphasizing noise generated between the light receiving section and the video signal amplifier.

This makes it possible to display X-ray images with a good S/N on a display device or record them on a recording medium with a recording device.
In subtractive angiography equipment,
The effect is especially great.

[Brief explanation of the drawing]

1 is a block diagram showing a schematic configuration of an X-ray fluoroscopic imaging apparatus according to Embodiment 1 of the present invention; FIG. 2 is a block diagram showing a configuration of a gain switch of a video signal amplifier shown in FIG. 1; Figure 3 shows an X that can perform cine X-ray photography according to the embodiment ① of the present invention.
A block diagram showing a schematic configuration of a fluoroscopic imaging apparatus. FIG. 4 is a block diagram for explaining problems with a conventional fluoroscopic imaging apparatus capable of performing cine X-ray imaging. In the figure, 1...X-ray operation console, 2...X-ray controller, 3...
...High voltage generator, 4...X-ray tube, 5...Subject, 6...1.1. ．． 7...Distributor (
Spectrometer), 8... X-ray television camera, 9... X-ray television camera control section, 9A... Video signal amplifier, 9B
. . . X-ray television camera controller, 10 . . . Display device, 11 . . . Camera for cine X-ray imaging, 12 .・Register for setting gain for fluoroscopy, 22・
...Gain setting register for shooting, 23...switcher,
24...Recording device.

Claims (1)

[Claims] (1) The X-ray image transmitted through the object is converted into an optical image by an image intensifier, this optical image is captured by an X-ray television camera, and the output signal is amplified by an amplifier and displayed or recorded. In an X-ray fluoroscopic imaging device,
The gain of the video signal amplifier of the X-ray television camera is
An X-ray fluoroscopic imaging device characterized by being provided with a gain switch that switches according to a radiation irradiation mode.