JPS59123066A - Display device of composite picture - Google Patents

Abstract

PURPOSE:To ensure the quick overlap of picture and at the same time to improve the accuracy of diagnosis by mixing two types of pictures with a desired ratio of distribution to obtain a video signal. CONSTITUTION:A composite picture is obtained and diplayed with a linear connection processed by a weight of a given ratio of distribution for the medical picture data on the same area of the same subject which are obtained by different picture diagnosing devices 1 and 2. Thus the entire state is understood from the state of the composite picture. Therefore an image given from a device at one side, e.g., an X-CT device can be observed if desired by controlling a variable resistor 5 to increase the ratio of distribution.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a display device for medical image diagnosis, and more particularly to a composite image display device that displays a plurality of medical images having mutually complementary characteristics in an overlapping manner. is.

[Technical background of the invention]

Medical image diagnostic equipment includes X-ray diagnostic equipment, ultrasonic diagnostic equipment, NMR-CT used
A device appeared. When each of these diagnostic devices images the same part of a subject, for example, X@CT can obtain a distribution of X-ray absorption coefficients on a tomographic plane, while NMR-CT can obtain a distribution of hydrogen nuclei by nuclear magnetic resonance. The nuclear medicine diagnostic equipment also returns the distribution of the administered radioisotope. In this way, each diagnostic device provides a variety of different biological information, such as form and function, and usually a complex image diagnosis using various diagnostic devices complementary to the same region is performed before a definitive diagnosis of a disease can be made. is necessary.

Conventionally, for such composite image diagnosis, a doctor would view the films outputted from each diagnostic device for the same area side by side on a Scherkasten, or multiple images would be displayed in parallel on a single screen on a composite image diagnosis device. The multi-frame display 71c, 71D also shows the outline of one image superimposed on another image.

However, in the case of multi-frame display, it is the same as arranging multiple images on a shark screen,
It is difficult to intuitively understand the positional relationship between the two images, and even with the method of superimposing the contours of one image on the other, although it is easy to understand the mutual positional relationship, it takes a lot of effort to extract the contours. It takes a lot of time to calculate, and furthermore, the contour lines omit minute information contained in the original image, making it impossible to perform quick and accurate complex diagnosis.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is possible to accurately grasp the positional relationship between the two images by superimposing and displaying images from various diagnostic devices for the same part of the subject. It is an object of the present invention to provide a composite image display device which can obtain a composite image quickly and with good operability without damaging the biological information possessed by each of the two images, and can perform diagnosis efficiently.

[Summary of the Invention] That is, in order to achieve all of the above objects, the present invention uses data of each medical image obtained by simultaneously photographing a diagnostic region using multiple types of image diagnostic apparatuses having complementary roles. a memory for storing each of the medical images, a means for setting a distribution ratio of each of the medical images, a means for linearly combining each of the medical images stored in the memory with a weight corresponding to this distribution ratio, and this linear combination processing. The medical image data of the same part of the same subject obtained by a plurality of different image diagnostic apparatuses are linearly combined using the weight of the given distribution ratio, and the medical image data of each of the medical images is A composite image in which the images are superimposed is obtained, and this is provided to a display means for display, and images of the same region between different types of image diagnostic apparatuses are synthesized at a given distribution ratio to synthesize the different types of images and superimpose them. This makes it possible to combine images and display them as a composite image, so that special calculation processing is not required for the superimposition process itself.This makes it possible to quickly obtain a composite image, and by varying the blending ratio, it is possible to create a desired type of image. The density of some medical images is made high and the others are made thin so that the details can be seen at any time, thereby making it possible to perform highly accurate diagnosis with high efficiency.

To explain specifically, X,1 ICT device and NMR-
Images of medical images obtained by imaging the same diagnostic site using two different types of image diagnostic devices that play complementary roles when performing integrated image diagnosis, such as a CT device. Between the memory that stores each data and the two stored images, rt t+j = a /lt, j+ 6
/zs,j; means for performing linear combination processing of images;
In the linear combination coefficient α, b, α is monotonically increasing with respect to C, and b is monotonically decreasing with respect to C. When C is the minimum, α=0.6=1, and when C is the maximum, α =1.
an arithmetic device for calculating α and b from one parameter C so that 6=0, and a calculation device for inputting the parameter C; A parameter input device such as a dial or rotary switch is configured, and the two images from the two types of image diagnostic devices at the same site stored in the memory are determined by the A' parameter given to the parameter input device. By performing linear combination processing and display using weighting coefficients α and b, the system is characterized in that it is possible to superimpose different complementary images of the same region without significantly impairing their image quality characteristics. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. First, the present invention will be explained in detail. The intermediate linear combination process of two images /xt,j and images /xi,j is
If the linear combination coefficient is α-b and the output image is fi, j, then gi, j”αfth, j+ b fxk, j
...It is expressed as (1). Now, the coefficient α of the linear combination,
In other words, the weighting of b is set at zero at the center and 100 in the positive and negative directions to determine the distribution ratio of fli,j and f2Lj.
If it is possible to set the distribution ratio so that when it is shifted, the distribution ratio is 100 on one side, 0 on the other, or 50 and 50 on the center, the deviation of the distribution ratio will be reduced. For position C, set c (-1≦C≦1) as a parameter, and set the first
As shown in the figure, if the distribution ratio is determined from the relationship between α and b depending on Kc,
When c=1, the output image U 1 * j is equal to ft1-j, and as C gradually approaches pa0'', the output image ys,
The component of jc′1fsi,j decreases, and f 2 i ,
The component of j increases. Then, when c=O, the ratio is 50/50, 1 gi, j=fti, j+2f21. becomes j. Further C
As gi + J becomes smaller, the component of fzi, j becomes dominant. At C = -1, (71 + j matches f2i, j. For example, if f 1 s, j is an X m CT image, ', fzi, NMR-CT at the same site as j
Both images. If C can be designated by a volume rotary switch or the like, the displayed image can be continuously changed from an X-ray CT image to an NMR-CT image by operating the volume. This situation is shown in Figure 2 in the form of a profile curve. Figure 2 (-) is fri
, j, and (e) shows the profile curve for fzi,j. When the coefficient C is decreased from 1 to -1 in increments of 0.5, the profile is <a) to (,), and as the eccentric position of C changes, the distribution ratio of both changes, which changes the profile. You can clearly see the changes.

In the present invention, for example, two types of images obtained by different types of devices are mixed at a desired distribution ratio to obtain a video signal, and this is fed to a display device to reproduce the image. This allows images to be displayed together without any arithmetic processing, and by changing the distribution ratio, it is possible to freely reproduce detailed information inherent in each image.

Next, an embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a system block diagram showing an outline of the apparatus of the present invention. Here, a composite diagnosis using two types of images, an NMR-CT image and an X-ray CT image, will be explained as an example.

In the figure, 1 is a CT apparatus, and 2 is an X@CT apparatus, each of which obtains six tomographic images of the same part of a subject. 3
4 is an image memory that stores image data of a tomographic image obtained by the NMR-CT device I, 4 is an image memory that stores image data of a tomographic image obtained by the X-ray α device 2, and 5 is a direct current A variable resistor 6 outputs the set value of C by adjusting the voltage division ratio by adjusting the movable terminal, with voltages +V and -V applied to both ends. /D
7 is an arithmetic unit which receives the output of the A/D converter 6 and calculates the distribution ratio of the two images by executing the second equation, and 8 is a reading device from the image memory 3; A multiplier 9 multiplies the image data for each pixel by the distribution ratio obtained by the arithmetic unit 7 to obtain gradation data at the level of the distribution ratio assigned to the NMR-CT image; 9 is the pixel memory 4;
The arithmetic unit 7 is applied to the image data of each pixel that is read out.
A multiplier that multiplies the obtained distribution ratio by the distribution ratio to obtain gradation data of the level of the distribution ratio assigned to the X-ray CT image; ZO is an adder that adds all the outputs of these multipliers 8 and 9; 12 is an image memory that stores this added data at an address corresponding to the original position of the pixel as a frame image for display, and 12 is a display device that displays the image stored in this image memory IJ as a video. It is.

Next, the operation of this device having the above configuration will be explained.

The NMR-CT apparatus 1 and the X i CT apparatus 2 obtain tomographic images of the same part of each subject as digital data. The tomographic image data obtained by each of these devices is stored in a display image memory 3 provided corresponding to each device.
．． 4 and stored as a frame image. 5 is a variable resistor to which a DC voltage ±V is applied, which is divided and outputted, and the output can specify the weight for the two images when superimposing, that is, the distribution ratio. That's how it is. The output of this variable resistor 5 is given to a converter 6 for converting it into a digital quantity, and after being converted into a digital quantity by this A/D converter 6,
The weighting coefficients α and b are calculated by the arithmetic unit 7 that executes the calculation based on the equation (2). On the other hand, the images stored in the image memories 3 and 4 are simultaneously read out sequentially pixel by pixel at the same timing, and the multiplication with the coefficient value output from the arithmetic unit 7 is performed in accordance with each image memory 3.4. This is done by the multipliers 8 and 9 provided. Then, each multiplication result is sent to the adder 10, and after being added by the adder 10, it is sent to the display image memory 1 and stored at the address corresponding to the original pixel position of the pixel. . The images on the display image memory obtained through the linear combination calculation as described above are displayed on 12 display devices.

As a result, on the display device 12, two types of images of the same region obtained by the NMR-CT device 1 and the X i CT device 2 are superimposed, that is, displayed as a composite image.

Moreover, this device adjusts the voltage value mentioned above according to the voltage value obtained by adjusting the movable terminal of the variable resistor 5.

Since the distribution ratio between the two images can be adjusted, if you want to observe the overall condition from the composite image, or furthermore, for example, the detailed image from the XMCT image, you can adjust the variable resistor 5 to change the direction from the X-ray CT image. By increasing the distribution ratio of the hair, the image can be seen, and therefore the desired preservation can be reproduced at any time, such as by overlapping multiple images without losing the information of the images, and closing a specific image as needed. This makes it possible to perform diagnosis with high accuracy and speed.

Moreover, since both images are taken at the same position of the subject, the image of 2":) is a picture with the same image magnification and number of pixels, and the pixels at the same pixel position are read out at the same time and the distribution ratio is By making corrections according to the values, adding them, storing them in the display image memory, and supplying this to the display device, it is possible to superimpose two images without positional deviation, and special calculations are performed for the purpose of superimposition. Therefore, images can be superimposed quickly.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be practiced with appropriate modifications within the scope of the invention without changing its gist.

〔Effect of the invention〕

As described in detail above, the present invention includes a plurality of types of image diagnostic apparatuses having complementary roles, a memory for storing data of each medical image obtained by photographing the same diagnostic region of a subject, and means for setting a distribution ratio of each medical image; means for linearly combining each of the medical images stored in the memory with a weight corresponding to the distribution ratio; and displaying the linearly combined image. Linear combination processing 1 A composite image in which the respective medical images are superimposed, using a distribution ratio weight given to medical image data of the same part of the same subject obtained by a plurality of different image diagnostic apparatuses. At the same time, it is provided to a display means for display, and images of the same region between different types of image diagnostic apparatuses are synthesized at a given distribution ratio, so that the different types of images can be synthesized and displayed as a superimposed composite image. This eliminates the need for special calculation processing for the superimposition process itself, making it possible to quickly obtain composite images, and by varying the blending ratio, the density of the desired type of medical image can be adjusted. This composite image display has the following characteristics: it can make the image high and the others thin, and the details can be seen at any time, making it possible to perform highly accurate diagnosis with high efficiency. equipment can be provided.

[Brief explanation of drawings]

Figure 81 is a diagram for explaining the blending ratio during linear combination processing of two types of images, Figure 2 is a diagram based on this diagram showing how the profile changes as the blending ratio changes, and Figure 3 is a diagram for explaining the blending ratio of two types of images. FIG. 2 is a block diagram showing one embodiment. l...NMR-CT device, 2...X ill CT
Device, 3,4゜11... Image memory, 5... Variable resistor, 61/D converter, 7... Arithmetic device, 8.9...
- Multiplier, lO... Adder, 12... Display device. Applicant's representative Patent attorney Takehiko Suzue No. 2 (0) (C) (e) (b) (d) Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of case Patent application No. 1983-233519 2, Invention Name of composite image display device 3, relationship with the amended person case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, agent

Claims (1)

[Claims] A memo 1 for storing data of each medical image obtained by photographing the same diagnostic site by a plurality of types of image diagnostic apparatuses having complementary roles, and means for setting a distribution ratio of each of the medical images. , a means for linearly combining each medical image stored in the memory with a weight corresponding to the distribution ratio, and a means for displaying the linearly combined image. A composite image display device.