JPS63154155A - Medical image display apparatus - 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 [Object of the Invention] (Field of Industrial Application) The present invention relates to a medical image display device that displays a desired cross-sectional area of a subject in color.

(Prior Art) X-ray CT apparatuses, MRI apparatuses, and the like are known as medical diagnostic apparatuses for copying tomographic images of desired parts of subjects.

The obtained tomographic image is displayed on a display and used for diagnosis. In order to observe such medical images and make accurate diagnoses, it is important to obtain images with excellent contrast, and for this purpose, window processing and the like are performed.

On the other hand, recently there has been a movement to utilize such medical images for surgical planning. In this surgical plan, images with excellent contrast are not important as in the case of making the above diagnosis, but rather the tumor.

It is important that the positional relationships between organs, organs, blood vessels, etc. are clearly displayed. Three-dimensional information display is required to accurately recognize positional relationships. However, the tomographic image displayed on the display can only display two-dimensional information, and cannot display three-dimensional information. Therefore, the following methods are known as methods for displaying three-dimensional information on a display based on two-dimensional information.

1. Displaying multiple different tomographic images simultaneously on the same screen,
Display multi-frame display.

2. Display multiple different tomographic images one after another on the same screen at high speed.

3. Reconstruct the images based on multiple tomographic images to create a coronal image orthogonal to the tomographic image, a sagittal image, or an orthogonal image oblique to the tomographic image using MPR () lulti Planer.
It is displayed using a method called Reconstruction.

4. The tomographic image, coronal image, and sagittal image are combined and displayed as a tomographic image.

5. Visually display a three-dimensional image by shading a specific part, such as a bone, which has been binarized.

(Problem to be solved by the invention) However, each of the display means has the following problems.

(1) The method 1.2 is not suitable for surgical planning because it is impossible to display images from any direction.

(2) Method 4.5 takes time to reconstruct an image.

(3) With method 3, coronal images and sagittal images can be easily reconstructed at high speed due to increases in memory capacity and advances in acceleration calculation devices, but it takes time to reconstruct oblique images or rotational images.

The present invention has been made to address these problems.
It is an object of the present invention to provide a medical image display device that can clearly display the positional relationship of each part.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides means for binarizing three-dimensional information of a plurality of parts and storing it as a plurality of bits, and an operating means for specifying a desired cross-sectional area of information; a means for extracting data corresponding to the desired cross-sectional area from the three-dimensional information; and a means for extracting data corresponding to the desired cross-sectional area from the three-dimensional information; The apparatus is characterized by comprising a color display means for displaying area data as a color image.

(Function) Data corresponding to the specified cross-sectional area is extracted from the three-dimensional information, and the extracted data is displayed as a color image with different colors corresponding to the plurality of bits. Therefore, the positional relationship of a plurality of parts can be clearly displayed.

(Embodiment) FIG. 1 is a block diagram showing a medical image display device of the present invention, and 1 is a three-dimensional image storage device such as an X-ray CT device, MR
19 and binarized three-dimensional medical images are stored. Conceptually, the content of this three-dimensional memory device @1 is a three-dimensional structure with dimensions in the X, Y, and Z directions as shown in Figure 2, and each memory location stores, for example, 4 bits. He has good manners. Each of these 4 bits has a different organ, such as bones and blood vessels.

It stores binarized information about each site such as a tumor. As a result, four types of information are stored here. In reality, continuous ki and vassal areas are used as shown in Figure 3. -X in three dimensions as an example.

Each of the Y and Z directions is composed of a size of 128 pixels.

2 is an operation console with a microcomputer 2 as shown in Figure 4.
a, CRT2b,? '7' space 2G and -1-board 3d
It consists of Microcomputer 2a is C
Display messages necessary for dialogue on RT2b. The operator inputs a request regarding the display image using input means such as the mouse 2C and the keyboard 2d. The microcomputer 2a transfers the input request to a display data creation device, which will be described later, via an I/F (interface) 5a.

Reference numeral 3 denotes a display data creation device, which is mainly composed of a microcomputer 3a as shown in FIG. Connected. Furthermore, 4-bit data can be read from the three-dimensional image storage device 1 by specifying an address.

4 is a color image display device, as shown in FIG. 6, which includes a microcomputer 4a, an image memory 4b, and a color decoder 4C.
and a CRT 4d, and the microcomputer 4a and image memory 4b are connected to the display data creation device 3 via an I/F 5b. Furthermore, since one screen of the CRT 4d is composed of a matrix consisting of, for example, 128 x 128 pixels, the image memory 4b has 12 pixels of 4 bits.
It has a size of 8x128.

Next, the operation of this embodiment will be explained.

The three-dimensional image device 1 in FIG. 1 stores up to four types of binarized images created by a computer (not shown), for example, based on images from an X-ray CT device, MRI device, etc. . A known technique can be used as a means for creating a binarized image.

FIG. 7 schematically shows a tomographic image of the head obtained by, for example, an X-ray CT device, where 6 is a bone portion, and 7 is a bone portion 6.
It shows a swollen area surrounded by. Parts other than these are omitted.

Now, the case where these bone portion 6 and tumor portion 7 are binarized will be explained.

If CT value is used as one method, the bone part 6 is approximately 10
Since it shows a CT value of 00 or more, by setting the threshold value to 1000, pixels larger than this can be set to 21, such as ``(il?'', and pixels below it are 21, such as O''.Also, as another method, ROI Using (region of interest),
By setting an ROI surrounding the asserted portion 7 on the screen, it is possible to binarize the inside of the ROI as "1" and the outside of the ROI as "o", thereby creating a three-dimensional 21a image.

The data thus binarized is stored in the three-dimensional image storage device 1, with the bone portion 6 corresponding to the O-th bit and the tumor portion 7 corresponding to the first bit, for example.

Similarly, a three-dimensional binarized image is created based on the plurality of obtained tomographic images and stored in the same manner as described above.

For locations where neither CT image exists, data is created by interpolation, etc., and similar processing is performed.

Using the console 2, a desired cross-sectional area (tomographic plane) of the three-dimensional image is specified. magnification at the same time.

Specify mask bits. For example, if you want to see the image itself, specify 1x as the magnification, and the data read address will be calculated by making 1 pixel ΔP of the color image display device 4 correspond to 1 pixel Δd of the three-dimensional image storage device 1. . Similarly, when enlarging 8 times, the above ΔP is changed to Δd
Address calculation is performed in correspondence with /S.

Mask bits do not need to be specified when all four types of stored binarized images are displayed, but if there is an image that you do not want to display, specify that bit. This will mask that bit, so the specified image will not be displayed.

To specify a desired tomographic plane using the console 2, for example, specify movement on the X and y axes on the dialog screen, and move the mouse 2C left and right in the ±X direction, or up and down. indicates movement of the screen in the ±y force direction, and in the case of movement in the diagonal direction, movement of the screen in two directions. Further, when rotation is specified, if the mouse 2C is moved in the left-right direction, the mouse 2C is rotated left and right around the Z-axis as the rotation center, and when moved in the up-down direction, the mouse 2C is rotated around xvII as the rotation center. This will be explained below using a specific example.

Consider the case where the three-dimensional image has a cylindrical shape as shown in FIG. The center of the display screen now has three-dimensional coordinates (Xl, Yl
, Zl), and Xi, Yl are displayed in the plain plane. The display screen at this time becomes as shown in FIG. 9(a). First, when the mouse 2c is moved downward in the x, y, z movement mode, the screen becomes as shown in FIG. 9(b).

If you roughly move the mouse 2C to the left, the screen will change to the one shown in FIG. 9(C). Furthermore, when moving in the diagonal direction, the object moves in two directions, but in this case, the target shape is a cylinder, so the screen does not change within the length of the cylinder.

If you move outside the range of the cylinder, the image will no longer be visible. Figure 9 (
If you specify the rotation mode in the state shown in C) and move the mouse 2C to the right, the result will be as shown in Figure 9 (d>).If you move it further to the right, the result will be as shown in Figure 9 (e).

Next, the operation of the display data creation device 3 shown in FIG. 1 will be explained with reference to FIG. 10.

If the coordinates of the display screen are x, y and the coordinates of the pixel in the upper left corner are (0, 0>), the screen center C is (63, 5, 63,
5>. At this time, the coordinates with the screen center C as the origin are (
xl, yl), then x1=x-63,5 V'1=63.5-'y'.

Also, the orthogonal coordinate system with the origin at the center of the three-dimensional image is Xl,
Let Yl and Zl be the following determinant % Formula % At this time, the coordinate system X, Y, Z shown in FIG. 2 is X=63.
5+1 Y=63.5-Yl Z=63.5-Zl.

If these X, Y, and Z all satisfy O≦X≦127, 0≦Y≦127, 0≦7≦127, data exists. If this range is exceeded, the data becomes O. The address A of the data within the range is shown as A=Z·1282 +Y·128+X.

x=Q~127. An address A is calculated for each of the 128×128 values of V=O to 127, and the data at that address is read out from the three-dimensional image storage device 1 and sent to the color side edge storage device 4. As a result, a tomographic image at the origin is displayed.

Generally, the above formula (1) is It is indicated by.

ΔX, Δy, Δ2 (unit is display screen, positive and negative)
In this case, Xo, Vo, and Zo are expressed as follows.

(Left below) Also, if the center is rotated by θX (θX is negative for left-handed screws) in a right-handed direction when looking from the X@positive direction toward the origin, A case of θy rotation in a right-handed direction when looking at the direction of the origin is shown by .

The data of the designated tomographic plane is read out from the three-dimensional image storage device 1 in this manner, transferred to the color image display device 4, and placed in the image memory 4b in FIG. 6. The data in the image memory 4b is sequentially read out and converted into color signals by a color decoder 4C. Only 1 bit out of 4 bits of data is "'1"
is converted into a color signal corresponding to that bit. If two or more bits have "1", priority can be given to the bits, or the bits may be decoded into an intermediate color.

128 on the CRT4d by the decoded color signal.
An image of x128 pixels is displayed.

An example in which the present invention is applied to a surgical plan as shown in FIG. 11 will be described. When performing surgery on the path 8 connecting the bone portion 6 and tumor portion 7 in FIG. 11(a),
), route 8 is on the y-axis, and the center is 180° with y@
By rotating it, it can be confirmed that there are no important organs 9 on the path 8.

Therefore, the surgery can proceed.

In this way, according to the present invention, only the three-dimensional information necessary for surgery, etc. is binarized and stored, so even if it is three-dimensional data, the total data ω can be reduced, so that any tomographic plane (tomographic image) can be stored. can be easily taken out. This allows the tomographic plane to be viewed from various angles, making it easier to grasp three-dimensional information.

Furthermore, since the binarized data is displayed in different colors, the positional relationship can be clearly recognized.

[Effects of the Invention] As described above, according to the present invention, the positional relationship of desired parts of the subject can be clearly displayed, so that the surgical plan can be proceeded with efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the medical image display device of the present invention, FIG. 2 is a schematic diagram showing the main parts of the device of the present invention, FIG. 3 is a table showing the contents of FIG. 2, and FIG. 4 6 to 6 are block diagrams showing the main parts of the device of the present invention, FIG. 7 is a schematic diagram explaining the operation of the embodiment of the present invention, FIG. 8 is a schematic diagram showing a three-dimensional image, and FIG. 9 (a)乃￥(e) is a schematic diagram explaining the contents of FIG. 8, FIG. 10 is a matrix table explaining the operation of the embodiment of the present invention, and FIG. 11(a). (b) is a schematic diagram showing a general example of the present invention. 1... Three-dimensional painting biography! Device, 2... Operation console, 3...
-Display data creation device, 4...color image display device. Agent Patent Attorney Rule Ken Chika Yudo Dai Hu Norihito Figure 1 Figure 2 Figure 2 d Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 (b) Figure 9 (d) Figure 9 Figure 10 Figure 9 Organ Figure 11

Claims (1)

[Claims] Means for binarizing each of three-dimensional information regarding a plurality of body parts created from three-dimensional medical information, associating one bit with each one, and storing the plurality of binarized information as a plurality of bits;
operating means for specifying a desired cross-sectional area of the three-dimensional information; means for extracting data corresponding to the desired cross-sectional area from the three-dimensional information; 1. A medical image display device comprising: color display means for displaying data of a desired cross-sectional area as a color image.