JPS6024788A - Device for recording crt image of film - Google Patents

Abstract

PURPOSE:To prevent pairing phenomena by converting the standard TV signal of the interlacing method to the scanning direction in order. CONSTITUTION:When the desirable picture appears out of reproduced images, this picture is held in the frame memory 25 by pushing push bottons of a video processor 20, read out from the frame memory 25 by repeating it as the standard TV method of the interlacing method, and sent to the monitor TV16 and displayed as the standard TV video signal. On the other hand, when another button on the video processor 20 is depressed, the frame memory 25 is operated by the control signal from the readout control circuit 26 by the sequential scanning method of 525 scanning lines, 30 frames/sec, and the picture is displayed on CRT whose display movement is possible by the sequential scanning method. When the push button which is installed on the operation panel of the multi- imager 19, this picture is printed on the film.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applicable to a device for recording CRT images on film, which is used in digital subtraction angiography (DSA), CT equipment, ultrasonic diagnostic equipment, etc. Regarding improvements.

(b) Prior art DSA is a type of angiography, and the difference images obtained through digital processing by a video processor are displayed on a CRT and finally burned onto film, which is used for diagnosis and storage. used. Therefore, for proper diagnosis, it is important that the output image of the video processor is accurately represented on the film. By the way, in the past, CRT images were printed onto film using devices called multi-imagers, but in conventional devices, CRTs operated in the standard interlaced television scanning system, and 1
Since each image (l-frame image) is composed of two odd and odd fields, a phenomenon called bearing occurs in which the scanning lines of the odd-numbered fields are biased or overlap with the scanning lines of the even-numbered fields. 52 if
An image that is supposed to be represented by five scanning lines may be displayed using only half the number of scanning lines, resulting in only a low-quality image with a small amount of information being printed onto the film.

Such problems can be solved by using a multi-imager
The same applies when attempting to imprint a CRT image onto a film using a diagnostic device or an ultrasonic diagnostic device.

(c) Purpose This invention provides improved CRT images to film 1, which prevents the bearing phenomenon, records the obtained image information on the film without leaving it, and improves the quality of the recorded image. The purpose is to provide a recording device.

(D) Structure According to the present invention, an interlaced standard television video signal is converted into a progressive scanning video signal using a storage means, and this is transferred to a CRT operating in a progressive scanning format.
This CRTiiTjI4gl is displayed on the film.

(e) Example The example shown in the figure is applied to this invention or SA,
In this figure, X-rays are emitted from X-rays 111 toward a subject 12, and the transmitted image of the X-rays transmitted through the subject 12 is converted into an optical image while being amplified in brightness by an X-ray image intensifier 13. Ru. This optical image is converted into a video signal by the image pickup tube 14 and camera control unit 15, and digitally processed by the video processor 20 to obtain a difference image. That is, the video signal sent to the video processor 20 first passes through the input switch 21, is sent to the A/D converter 22, and is converted into a digital signal. The image signal of the contrast medium is sent to the frame memory 24 through the arithmetic circuit 23, and the mask image is thus stored in the frame memory 24.

Next, when a contrast agent is injected, digital video signals of a live image are sequentially outputted from the A/D converter 22. The arithmetic circuit 23 subtracts the signal of the mask image read out from the frame memory 24 from this signal for each pixel every time the video signal of the live image is sent. In this way, only the image of the contrast medium remains as a difference image, and an image of the blood vessel containing the contrast medium appears. This difference image is stored in the frame memory 25. The difference image thus stored is read out by the frame memory readout control circuit 26, subjected to D/A conversion in the D/A conversion and synchronization signal addition circuit 27, and outputted with a synchronization signal added thereto. The contents of the frame memory 25 are rewritten with a difference image newly obtained from the arithmetic circuit 23 every time one frame of the video signal of the live image is sent, and the difference image of the moving image is output from the video processor 20 in real time. It is. In this case, the difference image has 52 scanning lines.
It is output as an interlaced standard television video signal that consists of 1 frame image of 2 fields at 60 fields/sec, and is immediately displayed on monitor TV 1B, as well as on VTR (Video Cheap Recorder) 17 and VDR ( video disc recorder) 18
will be recorded.

After the X-ray irradiation is completed, the input 9J switch 21 is switched,
The VTR 17 or VDRlB is reproduced, the reproduced image is observed on the monitor TV 1B, and only the necessary images are burned onto film by the multi-imager 19 and left as a hard copy. In this case, when a desired image among the reproduced images appears, the second push button (not shown) on the operation panel of the video processor 20 is pressed to hold this image in the frame memory 25. Then, this image is repeatedly read out from the frame memory 25 in an interlaced standard television system, and is sent to a monitor such as TVI as an interlaced standard television video signal to be displayed in the traditional way. Now, if you press another pushbutton (not shown) on the operation panel of the video processor 20,
The frame memory read control circuit 2G is switched, and the frame memory 25 is read out in a sequential scanning manner with a scan number of 525i and a rate of 30 frames per second. A synchronization signal will be added accordingly. multi imager 19
is equipped with a CRT (not shown) that operates in a sequential scanning mode, and the held images shown in L are displayed on this CRT in a sequential scanning mode, and a pushbutton provided on the operation panel of the multi-imager 19 is used. When a button (not shown) is pressed, this image is imprinted onto a film (not shown).

When the recording on the film is completed in this way, push button 11 on the operation panel of the video processor 20 is pressed to switch the frame memory read control circuit 26 back to the original interlaced standard television format.

In this way, interlaced standard television video signals are converted into progressive scanning video signals, which are then displayed on a progressive scanning CRT and transferred onto film, which often causes problems with interlaced systems. There is no bearing phenomenon, and all the obtained image information can be recorded on the film, improving image quality.

In addition, in the embodiment described in item 1, the number of scanning lines is 52, assuming that the video signal of the progressive scanning method has the same amount of information as the original interlace method.
5 lines, 30 frames per second, but the number of scan lines can be doubled or tripled, and the same information can be output repeatedly on the last two or three scan lines, or the original adjacent scan lines can be It is also possible to interpolate and output the information of the scanning line located in the middle from the information of , display the image with the increased amount of information on the CRT, and record it on the film. Further, in the above embodiment, switching from the interlaced format to the sequential scanning format is performed by operating a push button on the operation panel of the video processor 20. When a push button for burning is operated, a signal may be sent to the video processor 20 as shown by the dotted line in the figure to switch the scanning method.

In addition, when a frame 1 and a memory are provided like the DSA in the above embodiment (CT devices and ultrasound diagnostic devices are also usually provided with a frame memory), this is used to convert the scanning method. By doing so, it is possible to omit the provision of a separate frame memory, but it is also possible to provide a frame J memory and a frame memory successive control circuit in the multi-imager, thereby converting from an interlaced system to a sequential scanning system.

(f) Effects According to the present invention, an interlaced standard television video signal is converted into a progressive scanning video signal, and this is displayed on a CRT operating in the progressive scanning method.
Since the RT image is printed directly on the image, the bearing phenomenon can be prevented, and the image information obtained by DSA, CT equipment, and other systems can be recorded on film without losing any of the image information. Image quality can be improved.

[Brief explanation of the drawing]

The figure is a block diagram of an embodiment of the present invention. 11...X-ray tube 12...Subject 13...X-ray image intensifier 14...
Imaging 't 15...Camera control unit 1
6...Monitor TV 17...VTR18...V
D R19...Multi-imager 20...Video processor 21...Manual switch 22...A/D converter 23...Arithmetic circuit 24.25...Frame memory

Claims (1)

[Claims] (1) storage means for receiving an interlaced standard television video signal and storing this signal for one frame;
A readout control means reads out the video signal stored in the storage means in a sequential scanning manner, a progressive scanning CRT display means to which the video signal read out in the progressive scanning manner is sent, and an image on the CRT display means is read out. A device for recording CRT images on film, comprising means for printing onto the film.