JPS63135134A - Apparatus for superposition display of blood vessel image and fluoroscopic image - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (b) Industrial application fields INDUSTRIAL APPLICATION This invention is utilized in the field of the display of a medical diagnostic image.

TECHNICAL FIELD The present invention relates to a blood vessel image/fluoroscopic image superimposed display device, and particularly relates to expansion of angiography (digital subtraction angiography).

(b) Prior Art Conventionally, catheter sweeping when lining a blood vessel has been carried out using the following three methods.

A blood vessel image is displayed on one monitor, and a fluoroscopic image of the catheter, etc. is displayed on the other monitor, and the catheter is swept while comparing the two monitors. However, with this method, it is difficult to grasp the positional relationship between the blood vessel and the catheter.

The second method is to simply add the DSA image and the fluoroscopic image, but the result is an image of a black catheter moving within the black blood vessel image, making it very difficult to see the catheter.

The third method is based on the combination of a flash image and a perspective image, but artifacts due to the movement of the fool may occur, resulting in an image that is very difficult to see.

An object of the present invention is to provide a blood vessel image/fluoroscopic image superimposed display device in which a blood vessel image and a catheter fluoroscopic image are distinguished and displayed, and catheter sweeping is facilitated.

(d) Means for solving the gap M point The above-mentioned purpose is to provide a frame memory for blood vessel images by DSS, and an input/output conversion memory that reads the memory data and changes its contents according to the level area. ,
An adder of the X-ray TV fluoroscopic image including the catheter site digitally outputted in real time by an A/D converter and read data of the input/output conversion memory, and an output image of the adder via the D/A converter. This can be achieved by having one monitor that displays

(e) Action The blood vessel image obtained by DSA and the fluoroscopic image including the catheter are displayed on one monitor, but in this case, it is known that blood vessels are expressed as values smaller than the intermediate value, so A large value is considered unnecessary, and the blood vessel image is converted into BR inversion, thereby making the blood vessel image easier to see, distinguishing it from a catheter fluoroscopic image, and facilitating catheter sweeping.

(f) Example A preferred embodiment of the invention will be explained based on the drawings.

FIG. 1 is a block diagram of main parts showing one embodiment.

In this figure, 10 is a TV camera, 12 is an A/D converter, 14 is an adder, 16 is a D/A converter, and 1 is a display or monitor.

These vessels 10 to 1 are the main parts of a general X-ray TV apparatus, and the vessel placed in front of the TV camera 10 is omitted.

Next, 20 is a DSA a frame memory, in which the DS reproduced from a video digital recorder attached to an X-ray digital subtraction system (not shown) is stored.
It stores the A image. 22 is a look-up table or bath force conversion memory.

With this configuration example, the adder 14 basically adds the DSA image in the frame memory 20 and the fluoroscopic image including the catheter obtained by A/D converting the video signal from the TV camera 10. The output image is subjected to D/A conversion by a D/A converter 16 and then output and displayed on a monitor 18.

If you simply add the DSA image and the fluoroscopic image, the mo ÷ 1
8, the black catheter moves inside the black blood vessels, making it very difficult to see.

Therefore, in order to express the blood vessels in white, look up
After passing through the table 22, it is added to the perspective image.

FIG. 2 is a diagram illustrating input/output conversion of the look-up table 22 according to the present invention.

DSA images are generally known to have a density distribution as shown in Figure 3, but blood vessels and the like are expressed as values smaller than the middle M value, and values larger than the middle value are expressed as values at the time of imaging. It is thought that this is an artifact (false image) caused by the movement of the subject.

By setting the look up table 22 to output 0 for such unnecessary data, the influence of such artifacts can be minimized.

By adding the DSA image obtained through such a look-up table and the fluoroscopic image, an image of a black catheter inside a white blood vessel is obtained, which greatly facilitates catheter manipulation, and this image can also be used on film. It is also possible to record the position of the catheter at the time of imaging.

Furthermore, by rewriting the contents of this look-up table, the ratio between the fluoroscopic image and the blood vessel image can be adjusted to the optimum one.

Furthermore, a blood vessel image can be superimposed on digital values of a fluoroscopic image by adding an adder and a frame memory and applying a recursive filter.

(g) Effects During angiography, blood vessel images and fluoroscopic images can be observed simultaneously on one monitor, making catheter sweeping very easy.

In addition, the position of the catheter at the time of blood vessel imaging can be stored as an image.

Furthermore, the balloon catheter can be reliably located at the stenosis location during PTA (percutaneous angiodilation).

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part showing one embodiment of the present invention, FIG. 2 is a characteristic diagram of an input/output conversion memory according to the present invention, and FIG. 3 is a diagram illustrating the wet/wet distribution of a general SA image. 10 is a TV camera, 14 is an adder, 20 is a frame memory, and 22 is a look up table or input conversion memory. Figure 1 Figure 3 Figure 2 Figure 8

Claims (1)

[Claims] It includes a DSS blood vessel image frame memory, an input/output conversion memory that reads the memory data and changes its contents according to the level area, and a catheter site that is digitally output in real time by an A/D converter. It is characterized by comprising an adder for the X-ray TV fluoroscopic image and the read data of the input/output conversion memory, and one monitor on which the adder output image is displayed via a D/A converter. A superimposed display device for blood vessel images and fluoroscopic images.