JPH02249534A - X-ray image diagnosis device - Google Patents

Abstract

PURPOSE:To facility the confirmation of the position of a catheter by taking up an electrocardiographic wave form when the catheter is advanced while observing a X-ray fluoroscopic image, and by freezing an fluoroscopic image having the same electrocardiographic phase as that of a reference image, and by displaying the fluoroscopic image together with the reference image. CONSTITUTION:An X-ray is irradiated from an X-ray generating device 2, and an image forming agent is injected into a vein from an injector 9. Thus obtained image is converted into a photosignal by an image intersifier 3, and is then digitalized by an A/D converter. This image is stored in one of memory sections 6a, 6b,... in a memory device 6 which correspond respectively to individual images, while an electrocardiographic wave form from an electrocardiograph 13 is stored in a memory section 14, and is then analog-converted by a D/A converter 11 so as to be displayed on one side of a display device 7. When a balloon catheter is inserted, a fluoroscopic image is displayed on the other side of the display device 7. In an image processing device 5, a latch 16 latches the electrocardiographic wave form the electrocardiograph 13, and one of the taken-up images is designated as a reference image. When an electrocardiographic wave having a phase equal to that of the reference image is delivered from the electrocardiograph 13, an image freezing signal is delivered so as to display the image together with the reference image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display method in an X-ray image diagnostic apparatus, and particularly to an image display method suitable for cardiac examination and treatment.

[Conventional technology]

In recent years, with advances in image processing technology, medical image diagnostic apparatuses have also been digitized.

It started with X-ray CT equipment, but has recently developed into film digitizers that read X-ray films with laser beams, and magnetic resonance imaging (MRI) that uses nuclear magnetic resonance.
ance Imaging) etc. have been developed. In the field of cardiovascular imaging, conventionally images were taken on 35m + cine film, but with the development of high-definition TV cameras,
Attempts are being made to digitize this and perform image processing to improve diagnostic ability.

FIG. 2 shows a block diagram of a conventional television camera cardiovascular diagnostic system. The X-ray generating device 2 is controlled via the X-ray control unit 12 based on the control signal from the image processing device 5, and X-rays are emitted from the X-ray generating device 2. The intensity of the line is determined by an image intensifier (hereinafter abbreviated as 1.1.)
3 converts it into light and photographs it with TV camera 4. Simultaneously with imaging, the injector 9 injects a contrast medium into the blood vessel to be detected. Video signal of TV camera 4 A
The image is digitized by the /D converter 1o, made into an easily viewable image by the image processing device 5, and then converted into analog by the D/A converter 11 and displayed on the display device 7. At the same time as shooting, the digital image data in the image processing device 5 is
Each address section 6 a , 6 b in the image memory 6 ,
6 c t 6 d, t6e, . . . respectively.

By using this system, you can get 1 image at the same time as shooting! Since there is no need for the development time required in the case of cine film, rapid testing can be performed and failures can be prevented.

Note that, as a document describing this type of device, for example, image diagnosis vol. 1.9. N (11, 1989, P.

17-18. There is "coronary angiography."

[Problem to be solved by the invention]

In addition to cardiovascular imaging using the conventional techniques described above, recently, treatment has come to be performed simultaneously with examinations. P T
CA (Percutaneous Translum
internal Coronary Angioplasty)
This technique involves inserting a balloon catheter into the narrowed area of a blood vessel, then inflating the balloon to widen the narrowed area. Since it is a physical treatment, it is more effective than conventional drug treatments.

Although the risk is high, it is performed for patients with acute angina or for patients for whom medication therapy has little effect. When performing this treatment, it is important to advance the balloon catheter accurately to the stenosis. Before inserting the balloon catheter, a contrast agent is injected and an image is taken to obtain a reference image for inserting the balloon catheter. One of the images is displayed on one side of the display device 7, fluoroscopy is performed while viewing this image, and the balloon catheter is advanced while viewing both this fluoroscopic image and the reference image.

Figure 3 shows a reference image. This is an image taken of the right coronary artery, and the stenosis 13 is targeted for treatment. While looking at this image, perform fluoroscopy and advance the balloon catheter. FIG. 4 shows a perspective image.

During fluoroscopy, since there is no contrast agent in the blood vessel, only the balloon catheter 20 is visible, and the markers 15 indicating both ends of the balloon portion are also visible at the same time. Mark this marker at the stenotic part 13.
However, since the heart is moving, the balloon catheter 20 moves continuously as shown in FIGS. 5 and 6. Therefore, determining the position using a moving fluoroscopic image while looking at a stationary reference image requires skill, and there are also problems with accuracy, and conventional systems have not taken this point into consideration. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art and to provide an X-ray image diagnostic apparatus that can easily and accurately position a balloon catheter without requiring any skill. .

(Means for solving 21 problems) In order to achieve the above purpose, when capturing a reference image, an electrocardiogram waveform is captured and the timing of each image within one heartbeat is recorded. ,and,
When advancing the balloon catheter while looking at the fluoroscopic image, the electrocardiogram waveform is also captured, and by freezing the fluoroscopic image with the same electrocardiogram phase as the reference image and displaying it together with the reference image, the position of the balloon catheter can be easily confirmed. .

[Effect]

When photographing to obtain a reference image, an image of one heartbeat that best depicts the stenosis is selected and recorded in the image memory. At that time, the electrocardiographic waveform corresponding to each image is also recorded, and when the balloon catheter is advanced through fluoroscopy, the fluoroscopic image with the same electrocardiographic timing as the reference image is frozen and displayed. Thereby, comparison with the reference image can be easily and accurately performed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
The diagram shows an electrocardiograph 13 compared to the conventional system shown in Figure 2.
An electrocardiogram memory 14 is added, and an electrocardiogram comparison section having the configuration shown in FIG. 7 is added within one image processing device 5.

An X-ray generator 2 emits X-rays, and an injector 9 or the like injects a contrast medium into the heart blood vessels.

1.1.3, convert it into an optical signal and send it to the A/D converter 10.
digitize by The digitized image is
The image processing device 5 makes it easy to view and records it in the image storage device 6, and the electrocardiogram waveform from the electrocardiograph 13 is also stored in the memory section 6a corresponding to each image in the image storage device 6 as an electrocardiogram memory 14. , 6b, . . .
Further, the data is converted into analog by the D/A converter 11 and displayed on one side of the screen of the display device 7. When inserting the balloon catheter, a fluoroscopic image is displayed on the other side of the screen of the display device 7 while performing fluoroscopy.

FIG. 7 shows an electrocardiogram comparison section built into the image processing device 5. The electrocardiogram from the electrocardiograph 13 is latched at the lunch 16, one image is designated as a reference image from among the images previously captured with the electrocardiogram, and an electrocardiogram having the same phase as the electrocardiogram is input from the electrocardiograph 13. When this occurs, a one-image freeze signal is output, and the perspective image at that time is frozen and displayed together with the reference image.

In this embodiment, two display devices 7 are used, but the screen may be divided and displayed on one display device 7 for easier viewing. A display example is shown in FIG.

A reference image 18 is displayed on the left side, and a perspective image 19 is displayed on the right side.

〔Effect of the invention〕

According to the present invention, since the fluoroscopic image can be frozen in the same phase as the electrocardiogram of the reference image, the insertion position of the balloon catheter can be confirmed with high accuracy.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional technique, and FIG. 3 is a block diagram showing a conventional technique. Reference image, Figure 4 is a fluoroscopic image of the balloon catheter, Figures 5 and 6 are fluoroscopic images of different phases, Figure 7 is a block diagram of the electrocardiogram comparison section, and Figure 8 is a single display device. This is an example in which a reference image and a perspective image are displayed. 1... Subject, 2... X-ray generator, 3... 1.
1. . 4...TV camera, 5...Image processing device, 6...
- Image storage device, 7... display device, 8... bet,
9... Injector, 10... A/D converter, 11
...D/A converter, 12...X-ray control unit, 13...electrocardiograph, 14...electrocardiogram memory, 1
5... Marker 16... Latch, 17... Comparator, 18... Reference image, 19... Fluoroscopic image. $3 Eye potato 4- Eye sheep 5 Eye Mootome 16 Eye Otsuya

Claims (1)

[Claims] 1. An X-ray generator, a means for converting the X-rays transmitted through the subject into an optical image, a television camera for taking this optical image, a means for digitizing the video signal from the television camera and processing the image, and processed data. It is equipped with an image memory for storing image data, a means for converting the image data into a video signal and displaying the image, and simultaneously displays a reference image obtained by capturing the stored contents of the image memory and an image currently being captured from a television camera. In an X-ray image diagnostic device that performs examinations and treatments, an electrocardiograph that detects the electrocardiogram waveform of a subject;
A memory for simultaneously capturing an electrocardiogram when capturing the reference image and storing the electrocardiogram corresponding to each reference image, and means for comparing the electrocardiogram corresponding to the image currently being captured and the electrocardiogram corresponding to the reference image, An X-ray image diagnostic apparatus characterized in that when an electrocardiographic wave having the same phase as an electrocardiographic wave of an arbitrary reference image is obtained, a fluoroscopic image at that time is frozen and displayed simultaneously with the reference image.