JPH0779959A - X-ray diagnostic apparatus - Google Patents

Abstract

PURPOSE:To provide a display means to display contrast-media-utilized blood- vessel images of both before and after a cirtain treatment which have identical phases detected by a phase detecting means in order to avoid selecting the image corresponding to the reference image out of a series of post-expantion contrast-media-used images and to facilitate evaluation of the degree of expansion of the stricture. CONSTITUTION:When contrast-media-utilized blood-vessel images are collected, the phase of an electrocardiogram is detected by the phase detecting circuit 5 at the same time. Then the reference images together with the phase of electrocardiogram are memorised in a memory A6, out of which one sheet of image is held to be displayed on a monitor A2 as the reference image by way of a D/A converter 10. On the other hand, the contrast-media used image of the post-exfpansion stricture of the coronary arteries is memorized in a memory B7 which is displayed on a monitor B3 through a D/A converter 11. Then, the phases of electrocardiograms read out from memories 6 and 7 are compared by a holding means 8, and once the phases agree, the memory B7 stops output. Accordingly, the phase of the reference image and the post-expansion contrast- media image with the identical phase are held on the monitor B3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus for displaying an X-ray contrast image of a blood vessel on a monitor for diagnosis.

[0002]

2. Description of the Related Art Recently, based on an X-ray contrasted blood vessel image,
PTCA (percutaneous transluminal angioplasty) for expanding a stenosed portion of a coronary artery using a balloon catheter is widely used. When this PTCA is actually performed, it is performed as follows. First, it is often the case that several images of the coronary stenosis before expansion are taken into the image memory and one of the images is held as a reference image for comparison with the expanded image after expansion. Next, the stenosis is expanded with a balloon catheter and then imaged to determine the degree of expansion.
At this time, the degree of expansion is determined by comparing the obtained contrast image and the reference image.

[0003]

However, the contrast image after dilation is a moving image that moves with the movement of the heart, whereas the reference image is a still image that is held, so the degree of dilation of the stenosis is large. Is hard to judge. Therefore, it is necessary to manually select an image in which the expanded portion has the same position as the reference image from the series of expanded contrast images. Also, to make it easier to see the stenosis, even if the images are enlarged and displayed before and after dilation, the position of the blood vessel and the blood vessel shape on the image change as the heart moves, making it rather difficult to see. Can also be considered.

An object of the present invention is to provide an X-ray diagnostic apparatus which does not need to select an image corresponding to a reference image from a series of contrast images after dilation and which makes it easy to judge the extent of dilation of a stenosis. To do.

[0005]

The invention corresponding to claim 1 for achieving the above object is an X-ray image collecting means for collecting angiographic images before and after a predetermined treatment, and at the time of angiographic image acquisition. Phase detection means for detecting the phase of the electrocardiogram of,
An X-ray diagnostic apparatus comprising: a display unit that simultaneously displays the angiographic images before and after the predetermined treatment in which the phases detected by the phase detection unit match.

In order to achieve the above object, the invention according to claim 2 is to detect an X-ray image acquisition means for acquiring angiographic images before and after a predetermined treatment, and to detect a phase of an electrocardiogram at the time of acquiring the angiographic images. And a display means for simultaneously enlarging and displaying a desired region of the angiographic images before and after the predetermined treatment in which the phases detected by the phase detection means coincide with each other. Characterized by X
It is a line diagnostic device.

[0007]

According to the invention corresponding to claim 1, when the angiographic images are acquired before and after the predetermined treatment, the phase of the electrocardiogram is simultaneously detected by the phase detection means, and the predetermined pre-treatment and the predetermined treatment in which the phases coincide with each other. The angiographic images after the treatment can be displayed at the same time, and the angiographic images before and after the predetermined treatment can be easily compared.

According to the invention according to claim 2, when the angiographic images are acquired before and after the predetermined treatment, the phase of the electrocardiogram is simultaneously detected by the phase detection means, and the predetermined pre-treatment and the predetermined treatment in which the phases coincide with each other. It is possible to simultaneously display the angiographic images after the treatment of (1) and enlarge a desired region, and further, it is possible to easily compare the angiographic images before and after the predetermined treatment.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of the present invention, which is a PT for a blood vessel stenosis.
A camera 1 that captures a plurality of X-ray contrast images before being enlarged by CA (hereinafter referred to as reference images) and a plurality of X-ray contrast images after expanding a blood vessel stenosis by PTCA (hereinafter referred to as contrast images after expansion), Display means for displaying the reference image and the X-ray contrast image, for example, a monitor (A)
2, a monitor (B) 3, an electrocardiograph 4 for measuring an electrocardiogram of a contrast image at the time of collecting reference images and after expansion, and a phase detecting means 5 for detecting a phase from the electrocardiogram, and a memory for storing both the phase and the reference image. Means such as the memory (A) 6 and storage means such as the memory (B) 7 that stores both the phase and the fluoroscopic image are compared with the phases read from the memories (A) 6 and (B) 7, and the phases are compared. Hold means (CMP) for holding the output of the memory (B) 7 when they match
8, an A / D converter 9 for converting an analog video signal obtained by the camera 1 into a digital signal, and a memory (A)
6, D / A converter 1 for converting each image signal digitally stored in the memory (B) 7 into an analog signal
It is composed of 0 and 11.

The operation of the first embodiment thus constructed will be described below. The reference image is stored in the memory (A) 6 together with the phase of the electrocardiogram, and one image held (selected) in the reference image is converted into an analog form via the D / A converter 10 and then monitored (A). 2 is displayed as a reference image.

2A and 2B are diagrams showing the phases of the reference image and the electrocardiogram, wherein (a) is the electrocardiogram, (b) and (c) are the reference images, and (d) is the phase of the electrocardiogram. In FIG. 2, for example, in the image n1, the phase P of the electrocardiogram at this time is
The image n2 shows the phase R of the electrocardiogram at this time, the image n3 shows the phase S of the electrocardiogram at this time, and the image n
4, the phase T of the electrocardiogram at this time is paired with the image and stored in the memory (A) 6. Then, it is assumed that the image n2 (the phase of the electrocardiogram is R) is held as the reference image and is displayed on the monitor (A) 2.

After the stenosis is expanded with a balloon catheter (not shown), in order to judge the degree of expansion, it is imaged again and a plurality of X-ray contrast images are acquired. This series of expanded contrast images is stored in the memory (B) 7 of FIG. The series of expanded contrast images are converted into analog through the D / A converter 11 and displayed on the monitor (B) 3.
When the image is read from the memory (B) 7, the phase of the electrocardiogram read together is held with the reference image displayed on the monitor (A) 2 and the phase of the electrocardiogram read from the memory (A). If the phases are matched, the output of the memory (B) 7 automatically stops, and the contrast image after expansion having the same phase as the phase of the reference image is held in the monitor (B) 3.

FIG. 3 shows a contrast image after expansion.
(A) is an electrocardiogram, (b) and (c) are the contrast images after expansion, and (d) is the phase of the electrocardiogram. Figure 3 (b),
The series of contrast images after the expansion shown in (d) are always automatically held on the monitor (B) 3 when they coincide with the electrocardiographic phase of the reference image. That is, FIG.
In FIG. 3, if the reference image having the electrocardiographic phase R is displayed in the memory (A) 2, the monitor (B) 3 also displays the expanded contrast image having the electrocardiographic phase R.

As described above, when the phase of the electrocardiogram is detected and stored in the memory together with the image, and the phase becomes the same as the held reference image, the contrast image after expansion is automatically held, so the operator Makes it easier to compare contrast images before and after expansion of the stenosis, and eliminates the need for an technician or the like to manually select contrast images for comparison after expansion. As a result, PTCA is facilitated.

In the first embodiment described above,
The once held contrast image may be held until the start button of the console or the like is pressed, or the subsequent contrast image may be displayed after a certain period of time has passed. <Second Embodiment> Further, as shown in FIG. 4, as a configuration in which a display interface 20 that performs processing for displaying a reference image and a contrast image after expansion on one screen is added to the configuration of FIG. The image and the contrast image may be displayed on one monitor by dividing the screen as shown in FIG. 5, or the reference image may be displayed on the sub-screen as shown in FIG.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a block diagram showing a schematic configuration of a third embodiment of the present invention. In addition to the configuration of the embodiment of FIG. 1, an input means 13 for designating a stenosis portion and a magnifying power, and a designated stenosis. Switch 14 for switching whether to display a magnified image
1 is different from FIG. 1 in that a narrowed portion detection circuit 12 that detects the coordinates of the designated narrowed portion on the screen and enlargement circuits 15 and 16 are added.

The enlargement circuit 15 enlarges the image read from the memory (A) 6 based on the coordinates and enlargement ratio of the narrowed portion from the narrowed portion detection circuit 12 and outputs the enlarged image to the D / A converter 10. The enlargement circuit 16 enlarges the image read from the memory (B) 7 based on the coordinates of the constriction and the enlargement ratio from the constriction detection circuit 12 and outputs it to the D / A converter 11.

The operation of the third embodiment thus constructed will be described below with reference to FIGS. 8 and 9. FIG. 8 is for explaining the phase of the reference image and the electrocardiogram, and the enlarged image. (A) is the electrocardiogram, (b),
(C) is a reference image, (d) is an electrocardiographic phase, and (e) is a display image on the monitor (A) 2.

FIGS. 9A and 9B are for explaining a contrast image after expansion. FIGS. 9A and 9B are electrocardiograms, FIGS. 9B and 9C are contrast images after expansion, and FIG. 9D is a monitor (B). ) 3 is a display image.

The procedure is the same as that of the first embodiment until the reference image shown in FIG. 8C and the detected electrocardiographic phase are stored as a pair in the memory (A) 6 of FIG. And
Also in this case, the image n2 (the phase of the electrocardiogram is R) is held and displayed on the monitor (A) 2. At this time, the switch (SW) 14 is connected to the a side.

Here, for example, when the operator uses the input means 13 to instruct the enlarged display and designates the narrowed portion and the enlargement ratio of the held reference image n2, the narrowed portion detection circuit 12 causes the designated narrowed portion. The coordinates on the image of the copy are detected, and the switch (SW) 14 is switched to the b side (enlargement circuit side). Then, the reference image n2 read from the memory (A) 6 is enlarged by the enlargement circuit 15 to the enlargement ratio designated as the detected coordinate center, and then the monitor (A) 2 is passed through the D / A converter 10. Is enlarged and displayed as shown in FIG.

After the expansion of the stenosis, an image is taken again to determine the degree of expansion, and a plurality of X-ray contrast images are acquired. The series of contrast images after expansion are stored in the memory (B) 7. At this time, it is stored together with the phase of the electrocardiogram as shown in FIG. This series of contrast-enhanced images after expansion is enlarged by the enlargement circuit 16 at the same enlargement ratio centered on the same coordinates as the enlargement center of the reference image enlarged and displayed on the monitor (A) 2, and then the D / A converter. It is enlargedly displayed on the monitor (B) 3 via 11. When reading from the memory (B) 7, the phases of the electrocardiogram read together are compared with the phase of the electrocardiogram read from the memory (A) 6 and the holding means 8 together with the reference image enlarged and displayed on the monitor (A) 2. When the phases match, the output of the memory (B) 7 automatically stops and the monitor (B) 3 holds the expanded contrast image having the same phase as the phase of the reference image.

Then, as shown in FIG. 9D, the series of contrast-enhanced images after expansion are always automatically held when they coincide with the phase of the electrocardiogram of the reference image, and have the same expansion center and the same expansion as the reference image. It will be enlarged and displayed at a rate.

By doing so, the monitor (B)
In FIG. 3, an enlarged image centering on the stenosis designated by the operator in the reference image is displayed as shown in FIG. 9D, and automatically when the held reference image and the electrocardiogram have the same phase. Since it is held appropriately, it becomes easy to compare the stenosis before expansion and after expansion. As a result, PTCA is facilitated.

In the third embodiment described above,
The once held contrast image may be held until the start button of the console or the like is pressed, or after a certain period of time, the subsequent contrast image may be displayed.

<Fourth Embodiment> As shown in FIG. 10, as a configuration in which a display interface 20 for performing processing for displaying a reference image and a contrast image after expansion on one screen is added to the configuration of FIG. The reference image and the contrast image after expansion are displayed on one monitor by dividing the screen as shown in FIG. 11,
Alternatively, the reference image may be displayed on the child screen as shown in FIG.

[0027]

According to the present invention described above, it is not necessary to select an image corresponding to a reference image from a series of contrast images after dilation, and it is easy to judge the degree of dilation of a stenosis. A line diagnostic device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an X-ray diagnostic apparatus according to the present invention.

FIG. 2 is a diagram for explaining the operation of FIG.

FIG. 3 is a diagram for explaining the operation of FIG.

FIG. 4 is a block diagram showing a schematic configuration of a second embodiment of an X-ray diagnostic apparatus according to the present invention.

5 is a diagram showing a first example of a display state of the monitor 2 in FIG.

FIG. 6 is a diagram showing a second example of a display state of the monitor 2 of FIG.

FIG. 7 is a block diagram showing a schematic configuration of a third embodiment of an X-ray diagnostic apparatus according to the present invention.

FIG. 8 is a diagram for explaining the operation of FIG. 7.

FIG. 9 is a diagram for explaining the operation of FIG. 7.

FIG. 10 is a block diagram showing a schematic configuration of a fourth embodiment of the X-ray diagnostic apparatus according to the present invention.

11 is a diagram showing a first example of a display state of the monitor 2 of FIG.

12 is a diagram showing a second example of the display state of the monitor 2 of FIG.

[Explanation of symbols]

1 ... Camera, 2, 3 ... Monitor, 4 ... Electrocardiograph, 5 ... Phase detection circuit, 6, 7, 13 ... Memory, 8 ... Hold circuit, 9
... A / D converter, 10, 11 ... D / A converter, 12 ... Constriction detection circuit, 14 ... Selector, 15, 16 ... Enlargement circuit.

Claims (2)

[Claims] 1. An X-ray image acquisition means for acquiring angiographic images before and after a predetermined treatment, a phase detection means for detecting a phase of an electrocardiogram at the time of acquiring the angiographic images, and a phase detected by the phase detection means. The X-ray diagnostic apparatus further comprises: a display unit that simultaneously displays the angiographic images before and after the predetermined treatment that coincide with each other. 2. An X-ray image acquisition means for acquiring angiographic images before and after a predetermined treatment, a phase detection means for detecting a phase of an electrocardiogram at the time of acquiring the angiographic images, and a phase detected by the phase detection means. An X-ray diagnostic apparatus, comprising: a display unit for simultaneously enlarging and displaying a desired portion of the angiographic images before and after the predetermined treatment that coincide with each other.