JPH06292086A - X-ray diagnostic device - Google Patents

Abstract

PURPOSE:To display sequentially plural subtraction pictures in real time by storing a mask picture at each photographing position to plural mask memories so as to obtain subtraction picture from the mask picture of the same position as a position at which a contrast picture is obtained. CONSTITUTION:A subtraction section 12 receives a contrast picture P7 obtained by applying a contrast medium to a reagent 2 from an A/D converter 11 and a mask picture picked up at the same position as the pickup position of the contrast picture is extracted from mask memories M1-M5. Then the difference between them is obtained to generate a subtraction picture of only a vein. Then a controller 13 which is displayed on a TV monitor 10 in real time by the the subtraction picture sends a step signal to a bed 4 to move a ceiling plate 41 by each predetermined interval and receives a movement confirming signal P4 to confirm the actual movement. Then a switching signal P5 is outputted, which switches the input of the mask picture to the memories M1-M5 depending on the position of the ceiling plate.

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 generating a subtraction image from images before and after administration of a contrast agent for diagnosis, and more particularly, for continuously photographing or seeing through a plurality of regions of a subject. X-ray diagnostic apparatus.

[0002]

2. Description of the Related Art In recent years, X-ray diagnostic apparatuses have been widely used as medical diagnostic apparatuses have been developed. The X-ray diagnostic apparatus irradiates an imaged region of a subject placed on a bed with X-rays from an X-ray tube and transmits X-rays transmitted through the imaged region to an I.D. I (Image Intensifier) collects the image and a fluoroscopic image is generated based on the image. In such an X-ray diagnostic apparatus,
Recently, a contrast agent is administered into the blood of a subject, and a contrast image (subtraction image) is generated from the difference between the fluoroscopic images before and after the administration (hereinafter referred to as “mask image” and “contrast image”, respectively). A method for diagnosing abnormalities in blood flow and the like is adopted.

A case where the lower limb blood vessel is diagnosed by using the X-ray diagnostic apparatus as described above will be described.

Administration of a contrast agent to a subject is performed using a catheter. A catheter is inserted into a blood vessel of a subject, and a contrast agent is injected into the blood vessel from the tip of the catheter.
Then, in synchronization with the speed at which the contrast agent travels from the abdomen to the feet, the top plate of the catheter bed on which the subject is placed is moved at a predetermined interval. Simultaneously with the movement of the tabletop, the X-ray tube is used to image or fluoroscopically observe the subject (hereinafter simply referred to as "stepping photography") at predetermined intervals, that is, at predetermined positions of the lower limbs of the subject (hereinafter referred to as "stage positions"). "). By this stepping imaging, it is possible to image or see through the blood vessels of the entire lower leg of the subject.

[0005]

However, when performing stepping radiography in such a conventional X-ray diagnostic apparatus, it is possible to generate a subtraction image for one stage during stepping radiography and display it in real time. However, it is not possible to continuously display subtraction images from multiple stages in real time. That is, since only the mask image in one stage can be stored in the mask image memory, there is a drawback that the subtraction images in a plurality of stages cannot be sequentially observed in the REAMS time.

The present invention has been made to solve such a conventional problem, and an object thereof is to provide an X-ray diagnostic apparatus capable of sequentially observing subtraction images of a plurality of imaging regions in real time. To provide.

[0007]

In order to achieve the above object, the present invention provides an X-ray fluoroscopic image (mask image) before administration of a contrast agent to a subject and an X-ray fluoroscopic image (contrast image) after administration. And an X-ray diagnostic apparatus for generating a contrast image from these differences for diagnosis, and a mask memory for capturing mask images at a plurality of regions of the subject and storing them before administration of a contrast agent. After the administration of the contrast agent, a contrast image is taken at the same site as the site where the mask image is taken, and a subtraction unit that generates a contrast image from the difference between the mask image and the contrast image at each site, and the subtraction unit. And a display unit for displaying the obtained contrast image in real time.

[0008]

In the present invention configured as described above, mask images are imaged at a plurality of imaging sites of the subject before administration of the contrast agent, and the images are stored in the mask memory. After that, a contrast image is photographed at the same portion as the portion where the mask image is photographed, a difference between these is obtained to obtain a contrast image, and this is displayed in real time. Thereby, a plurality of contrast images can be sequentially displayed in real time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It is a schematic block diagram of the X-ray diagnostic apparatus which concerns on this Example, and the to-be-tested object 2 mounted on the top plate 41 arrange | positioned on the catheter bed 4 is the X-ray tube 3 and I. I (image intensity) 1 is moved to a part sandwiched between. The X-rays emitted from the X-ray tube 3 and transmitted through the imaging region of the subject 2 are I.D. The image is converted into an optical image at I1, photographed by the television camera 101, and converted into a video signal P1. Then, the obtained video signal P1 is supplied to the digital processor 8.

The digital processor 8 comprehensively controls the X-ray diagnostic apparatus, and is connected to the X-ray controller 5 and the digital fluoroscope 6. Further, a step switch 7 is connected to the digital see-through device 6, and by operating this step switch 7, the top board 41 is
Slides in the longitudinal direction of the top plate by a predetermined distance.

FIG. 3 is a block diagram showing a detailed configuration of the digital processor 8. The AD converter 11, the subtraction unit 12, the controller 13, the high speed disk 14, and a plurality of mask memories (five in the figure). M1 to M5
have.

The AD converter 11 is an I.D. I1 is for digitizing the analog video signal P1 obtained by
This output is provided for each of the mask memories M1 to M5, the subtraction unit 12, the high speed disc 14, and the digital VTR 9
It is connected to the.

The mask memories M1 to M5 each store a mask image P6 photographed for each part of the subject 2, that is, for each stage. The outputs of the memories M1 to M5 are supplied to the subtraction unit 12. It

The subtraction unit 12 takes in a contrast image P7 obtained after administration of a contrast agent to the subject 2 from the AD converter 11, and takes a mask image at the same position as the contrast image, that is, at the same stage. Is extracted from the mask memories M1 to M5, the difference between them is obtained, and an image of only blood vessels, that is, a subtraction image is generated. And this subtraction image is
The controller 13, which is displayed on the TV monitor 10 in real time, sends a step signal P3 to the bed 4 to send the top board 41.
Is moved at a predetermined interval, and a movement confirmation signal P4 for confirming the actual movement is fetched and confirmed. Then, a mask image is input to each of the mask memories M1 to M5, and a switching signal P5 for switching according to the position of the top plate 41 is output to each of the mask memories M1 to M5. That is, the position at which the mask image is photographed and the photographed mask image are associated with each other.

The high-speed disk 14 stores and stores the photographed mask image and contrast image in a lump, and the digital VTR appropriately displays them.

Next, the operation of this embodiment will be described with reference to FIG. First, X-ray test exposure is performed at the initially set position of the subject (for example, S1 in FIG. 2), and the X-ray irradiation conditions at that stage are based on the information obtained by this test exposure. Is set. Then, the top plate 41 is moved by a predetermined interval in response to a command from the controller 13, and the X position is again moved at that position (S2 in FIG. 2).
The test exposure of the rays is performed, and the X-ray irradiation conditions at the stage are set. Thereafter, test exposure of X-rays is sequentially performed in each stage, and X-ray irradiation conditions are set for each stage.

Next, the mask image is photographed from the stage S5 where the test exposure of the X-ray is finally performed. The mask image taken at the stage S5 is the mask memory M
Stored in 5. Next, when the top plate 41 is subjected to the test exposure of X-rays by a command from the controller 13, the top plate 41 is moved in the opposite direction by a predetermined interval, a mask image is photographed on the stage S4, and the mask image is stored in the mask memory M4. To be done. After that, mask images are sequentially photographed on the respective stages S3, S2, S1, and these mask images are stored in the mask memories M3, M2, M1, respectively. When the mask images are captured and stored in the mask memories at all stages, the contrast agent is administered to the subject and the contrast images are captured.

First, an image is photographed in contrast on the stage S1 where the mask image is photographed last. The subtraction unit 12 performs a subtraction process on the contrast image and the mask image stored in the mask memory M1 to generate a subtraction image. Then, the subtraction image is displayed on the TV monitor 10 in real time.

After that, when the top plate 41 captures a mask image according to a command from the controller 13, the top plate 41 moves in the opposite direction by a predetermined interval, and a contrast image is captured on the stage S2. Then, a subtraction image is generated from this contrast image and the mask image stored in the mask memory M2, and this subtraction image is T
It is displayed on the V monitor 10 in real time.

Thereafter, contrast images are sequentially photographed on the stages S3, S4 and S5, and a subtraction image is generated from the contrast images and the mask images stored in the mask memories M3, M4 and M5. , Are displayed on the TV monitor 10 in real time.

In this way, in the present embodiment, a plurality of mask memories are prepared, mask images at each photographing region, that is, at each stage are stored, and when the contrast image is photographed, the contrast image is photographed. The mask image taken on the same stage as the
These subtraction images are generated. Therefore,
A plurality of subtraction images can be sequentially displayed in real time, which is extremely useful in X-ray diagnosis.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the claims.

In the above-described embodiment, the top plate 41 is moved along with the stepping photography, but the top plate 41 is fixed at a predetermined position and the X-ray tube 3 and the I.D. The X-ray holding device that supports I1 may be moved at predetermined intervals.

[0024]

As described above, according to the present invention, the mask image at each imaging region is stored in the plurality of mask memories,
When the contrast image is obtained, the subtraction image is obtained by subtraction from the mask image of the same part as the part where the contrast image is obtained. Therefore, it becomes possible to sequentially display a plurality of subtraction images in real time.

As a result, it is possible to obtain the effect of enabling highly accurate X-ray diagnosis.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing movement of a bed and an imaging region.

FIG. 3 is a block diagram showing a detailed configuration of a digital processor.

[Explanation of symbols]

 1 I. I (image intensifier) 2 subject 3 X-ray tube 4 catheter bed 8 digital processor 12 subtraction unit 13 controller 41 top plate 101 TV camera M1 to M5 mask memory

Claims (1)

[Claims] 1. An X-ray fluoroscopic image (mask image) before administration of a contrast agent to a subject and an X-ray fluoroscopic image (contrast image) after administration are imaged, and a contrast image is generated from the difference between these images for diagnosis. In the X-ray diagnostic apparatus to be used for, a mask memory that captures mask images at a plurality of regions of the subject before administration of a contrast agent and stores the mask images, and the same site where the mask images are captured after administration of the contrast agent. A contrast image is taken at a site, a subtraction unit that generates a contrast image from the difference between the mask image and the contrast image at each site, and a display unit that displays the contrast image obtained by the subtraction unit in real time, An X-ray diagnostic apparatus having: