JPH02228945A - Diagnostic apparatus by x-ray image - Google Patents

Abstract

PURPOSE:To obtain the title apparatus capable of accurately performing the positioning of a balloon catheter without requiring experienced skill by comparing the electrocardiogram corresponding to the image taken-in presently with the electrocardiogram corresponding to a reference image. CONSTITUTION:When a reference image is taken-in, an electrocardiogram is simultaneously taken-in to be recorded in an electrocardiographic wave memory 14 in corresponding to the reference image and the electrocardiogram corresponding to the image taken-in presently is compared with the electrocardiogram corresponding to the reference image taken out of the memory 14 by a comparator 17 and the coincidence of both electrocardiograms is confirmed and the reference image corresponding to said electrocardiogram is selected to be displayed along with the image taken-in presently. By this method, the positioning of PTCA at the time of the insertion of a balloon catheter can be accurately performed without requiring experienced skill.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an X-ray image diagnostic apparatus, and particularly aims to display images suitable for cardiac blood vessel examination and treatment of a human body (subject). The present invention relates to an X-ray image diagnostic apparatus.

[Conventional technology]

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

Starting with XMCTMC (computed tomography equipment), recently we have developed film digitizers that read X-ray film with laser beams, and MR that uses nuclear magnetic resonance.
I (Magnetic Re5onanceI a
dage) etc. have been developed. In the field of cardiovascular imaging, conventionally images were taken on 35 mm cine film, but with the development of high-definition television cameras, attempts have been made to digitize this and perform image processing to improve diagnostic capabilities.

FIG. 6 shows a block diagram of a conventional cardiovascular diagnostic system using a television camera. 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 the X-ray generating device 2 emits X-rays. The intensity of the line is converted into light by an image intensifier 3 and photographed by a television camera 4. At the same time as shooting, by injector 9.

11 A contrast medium is injected into the blood vessel that is to be treated. A video signal from a television camera 4 is digitized by an A/D converter 10, and image-processed by an image processing device 5.
The signal is converted into analog by the /A converter 11 and displayed on the display device 7. At the same time, the digital image data in one image processing device 5 is transferred to each address section 6a, 6 in the image memory 6.
b, 6c, 6d, 6e.

Each is stored in...

By using this system, images can be observed at the same time as they are taken, and there is no need for development time, which is required in the case of cine film, so inspections can be carried out quickly and failures can be prevented. A document describing this type of device is the magazine "Image Diagnosis" published by Shujunsha, Volume 19 (1989), No. 1, pages 12-18.

[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 Trans)
luo+1nal Coronary Angiopla
This is a percutaneous vasodilation technique called sty, in which a balloon catheter is inserted into the narrowed area of the blood vessel, and the balloon is inflated there to widen the narrowed area. 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, the current image is captured while viewing this image, and the balloon catheter is advanced while viewing both the currently captured image and the reference image.

A reference image is shown in FIG. This is an image taken of the right coronary islet, and the stenosis 25 is targeted for treatment. While viewing this image, capture the current image and advance the balloon catheter. Figure 8 shows the image currently being captured.

At this time, since there is no contrast medium 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. Place this marker at the stenotic part 25.
However, since the heart is moving, the balloon catheter 20 is advanced to the position shown in FIGS. 9 and 1O.
moves continuously. Therefore, the user is moving while looking at a stationary reference image.

Currently, determining the position using captured raw images requires skill and has problems with accuracy, and conventional systems have not taken this point into consideration.

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 to solve the problem]

The above purpose is to provide an electrocardiograph that detects the electrocardiogram waveform of the subject;
A memory is provided for simultaneously capturing an electrocardiogram when capturing a reference image and storing the electrocardiogram corresponding to each reference image, and a means for comparing the electrocardiogram corresponding to the image currently being captured and the electrocardiogram corresponding to the reference image. This is achieved by selecting a reference image when both electrocardiograms match best and displaying it in correspondence with the currently captured image.

[Operation] As shown in Fig. 5, when the reference images R1 to RIO are loaded into the image memory, the electrocardiogram (A) is simultaneously loaded, and the electrocardiogram (A) and the reference images R1 to RIO are loaded.
(Figure (B)) are recorded in correspondence, that is, labeled.Next, the images L1 to LIO currently being captured are
Compare the electrocardiogram (c) corresponding to (Figure (d)) with the electrocardiogram (a) of the reference image described above, and select the reference image from R1 to RIO with which both electrocardiograms match best, For example, for Ll, select R1,
R1 is displayed at the same time as Ll is displayed. This makes it possible to accurately compare the image currently being captured with the reference image.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are block diagrams of the present embodiment. The difference from the conventional example is that an electrocardiograph 13 and an electrocardiogram memory 14 are added in this embodiment, and an electrocardiograph 13 and an electrocardiogram memory 14 are added. The difference is that an electrocardiogram comparison section with the structure shown in Figure 3 has been added. The difference between FIG. 1 and FIG. 2 is that in FIG. 1, the electrocardiogram memo 1/4 is provided as a separate memory from the image memory 6, whereas in FIG. 6 are recorded at the same time, and there is no difference in function or effect.

The X-ray generator 2 emits X-rays, the injector 9 injects a contrast agent into the heart vessels, the image intensifier 3 converts the signal into an optical signal, and the A/D converter 10 digitizes the signal. The digitized image is processed by the image processing device 5 and stored in memory sections 6a and 6b in the image memory 6.

. . . are recorded so as to correspond to each image. The image retrieved from the image memory 6 is displayed as a reference image on one side of the screen of the display device 7 via the D/A converter 11.

The operation up to this point is the same as in the conventional example.

When attempting to perform PTCA in this embodiment, first,
Before performing PTCA, a contrast agent is injected from the injector 9, a photograph of the stenosis is taken, and the image is recorded in the image memory 6 as a reference image.

At that time, the electrocardiogram is also captured at the same time, and the electrocardiogram data corresponding to each reference image is stored in the electrocardiogram memory 1.
Record it within 4 days. Then, among the electrocardiogram data for several heartbeats, the electrocardiogram data for the 1b beat that best indicates the stenotic part is selected, and a reference image corresponding to this electrocardiogram data is selected and displayed.

The electrocardiogram comparison section shown in FIG. 3 performs this selection. The electrocardiogram data from the electrocardiograph 13 is received by the comparator 17 via the latch 16, and the comparator 17 receives the electrocardiogram data recorded in advance corresponding to the reference image, ``electrocardiogram data within month 4''. The electrocardiogram that best matches the data is selected and output as a single image selection signal.This signal causes the selected reference image and the currently captured image to be displayed simultaneously on the display device 7 in correspondence with each other. A display example is shown in Fig. 4. In this case, the screen of one display device 7 is divided and used, and the reference image 18 is displayed on the left side of one screen, and the image 19 currently being captured is displayed on the right side. As shown in FIGS. 1 and 2.

Two display devices 7 may be used, and the reference image 18 may be displayed on one of them, and the image 19 currently being captured may be displayed on the other.

〔Effect of the invention〕

According to the present invention, when a reference image is captured, an electrocardiogram is also captured and recorded in memory in a corresponding manner, and the electrocardiogram corresponding to the currently captured image is compared with the electrocardiogram for the reference image retrieved from the memory. The system is configured to check whether the two electrocardiograms match, select a reference image that corresponds to this electrocardiogram, and display it together with the image currently being captured, so positioning when inserting a PTCA balloon catheter does not require any skill. , can be performed with high precision.

[Brief explanation of the drawing]

1 and 2 are block diagrams of the overall configuration of an embodiment of the present invention, FIG. 3 is a block diagram of an electrocardiogram comparison section provided in an image processing apparatus according to the present invention, and FIG. A diagram showing an example of displaying a reference image and a currently captured raw image on the display device of the stand, FIG. 5 is an explanatory diagram of the operation of reference image selection in the present invention, FIG. 6 is a block diagram showing the prior art, and FIG. 7 ~Figure 10 is a diagram explaining the problems of the prior art, Figure 7 is a reference image, Figure 8 is a balloon catheter image, and Figures 9 and 10 are diagrams showing balloon catheter images in different phases. . Explanation of symbols 1... Subject 3... Image intensifier 5... Image processing device 6... Image memory 7...
・Display device 8... Bed 13... Electrocardiograph 14... Electrocardiogram memo 15... Marker 17... Comparator 18... Reference image 19... Image currently being captured 20. ...Balloon catheter 25...Stenosis area

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, an electrocardiograph that detects the electrocardiogram waveform of a subject, a memory that captures the electrocardiogram at the same time when capturing the reference image and stores the electrocardiogram corresponding to each reference image, and a memory that stores the electrocardiogram corresponding to each reference image. A means for comparing the corresponding electrocardiogram and the electrocardiogram corresponding to the reference image is provided, and the reference image with which the two electrocardiograms most closely match is selected and displayed in correspondence with the currently captured image. Line image diagnostic equipment.