JPS6051315B2 - X-ray television equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray television apparatus in which an object is irradiated with pulsed X-rays and a perspective image of the object caused by the X-rays is displayed as a television image.

In a conventional X-ray television apparatus of this kind, the first television image taken out after pulsed X-ray irradiation is written into an image recording device, and this image is stored until the next pulsed X-ray irradiation and the image is taken out. Intermittent television images were converted into continuous television images by outputting from a recording device.

Therefore, since only the image after pulsed X-ray irradiation is output, even if it is useful to understand the displacement between the images before and after irradiation, the TV images before and after the irradiation cannot be superimposed and output.・It was impossible to display.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and by superimposing the television image before pulsed X-ray irradiation on the television image after pulsed X-ray irradiation, pulsed It is an object of the present invention to provide an X-ray television apparatus capable of grasping positional displacement on a television image during an interval period.

FIG. 1 is a block diagram showing one embodiment of the present invention,
In the figure, 1 is a camera, 2 and 3 are mixers, 4 and 5 are image recording devices, 6 is a switch, 7 is a television receiver,
8 is a synchronization signal generator, 9 is an X-ray controller, 21 is a 2 vertical period delay circuit, and 22 is a 112 frequency divider circuit.

The output video signal of the TV camera 1 is supplied to mixers 2 and 3, the mixer 2 outputs a composite output of the output video signal of the TV camera 1 and the output video signal of the image recording device 5 to the image recording device 4, and the mixer 3 A composite output of the output video signal of the TV camera 1 and the output video signal of the image recording device 4 is supplied to the image recording device 5, and the output video signal of each image recording device 4, 5 is transferred to the switch 6.
The signal is supplied to the television receiver 7 through the channel.

Further, the image recording devices 4 and 5 are each controlled so that the writing operation is performed at a frequency of 112 times the frequency of the pulsed X-rays, with a phase difference of 180 degrees from each other, and the switch 6 is switched at the frequency of the pulsed X-rays. controlled as follows.

The control signal for the above switching operation is sent to a delay circuit 21 which delays the pulsed X-ray signal of the X-ray controller 9 by two vertical periods of the television.
The write operation control signal is supplied from a frequency divider circuit 22 which divides the switching operation control signal into 112 and outputs two signals having a phase difference of 180 degrees.

FIG. 2 is an explanatory diagram showing each signal in the embodiment shown in FIG. 1.

The X-rays irradiated from the X-ray controller 9 are pulsed X-rays having a pulse repetition frequency obtained by dividing the vertical synchronizing signal [Fig. 2 11] of the synchronizing signal generator 8 at regular intervals as shown in Fig. 2 13. It is controlled by an irradiation control signal [FIG. 2, 12] and is irradiated in a pulsed manner. Normally, the output video signal of the T-camera 1 is read out after two vertical frequency periods to utilize the accumulation effect of the image pickup tube, and is outputted as shown in FIG. 2 and supplied to the mixers 2 and 3. 15 and 16 in FIG. 2 are pulse X-ray frequencies, that is, 112 of the X-ray irradiation control signal [FIG. 2 12].
This is a write control signal applied to the image recording devices 4 and 5 at a frequency of 180 degrees with a phase difference of 180 degrees from each other.

If the mixing ratio of mixers 2 and 3 is 112 for the output video signal of the TV camera 1 that is read out first after 2 vertical periods, then the video signals written by the image recording devices 4 and 5 are 112. In other words, the output video signal has a ratio as shown in FIG. 2, 17 and 18. Therefore, the image displayed on the television receiver 7 via the switching device 6 which is switched and controlled by the frequency signal shown in FIG. Since the images at the time of X-ray irradiation are superimposed, it is possible to easily grasp the displacement that occurs during the pulsed X-ray irradiation interval.

In the above explanation, by setting the output video signal of the image recording device in the mixer to 112 of the output video signal of the camera, the image at the time of X-ray irradiation becomes the image at the previous X-ray irradiation. However, by making the mixing ratio in the mixer variable, it becomes possible to display at any superimposition ratio. As described above, according to the present invention, since the image during X-ray irradiation and the image during the previous X-ray irradiation are displayed in a superimposed manner, it is possible to easily grasp the displacement of the irradiated object before and after the X-ray irradiation. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing each signal in the embodiment shown in FIG. In the figure, 1 is a TV camera, 2 and 3 are mixers, 4 and 5 are image recording devices, 6 is a switch, 7 is a television receiver,
8 is a synchronization signal generator, 9 is an X-ray controller, 21 is a 2 vertical period delay circuit, and 22 is a 112 frequency divider circuit.

Claims (1)

[Claims] 1. In an X-ray television device in which an object is irradiated with pulsed X-rays and a perspective image of the object is displayed as a television image, each device has a frequency that is half the pulse repetition frequency of the pulsed X-rays, and 2, which was controlled so that the write operation was performed with a phase difference of 180 degrees.
Two image recording devices connected to each other so as to input a composite signal of the output video signal of the other image recording device and the television camera output video signal, and the output video of these two image recording devices An X-ray television apparatus characterized by comprising a switching device that switches signals at the pulse repetition frequency of pulsed X-rays and supplies them to a television receiver.