JPH0134061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CT image display device in a CT device that uses radiation such as X-rays, and more specifically to a CT image display device that simultaneously displays an Axial image and a Scout image on the same screen. It is.

In the image display of conventional CT scanners, the so-called axial cross-sectional image shown in Figure 1 and the Scout image represented by the unidirectional projection image showing the slice position and its angle of the target cross-section as shown in Figure 2 are the same. It was not possible to view the images simultaneously on the screen, and the only option was to select a file in which each image was stored and display one image at a time, as needed. Such image display has the disadvantage that it not only reduces diagnostic efficiency but also requires complicated operation.

The purpose of the present invention is to eliminate such drawbacks and
An object of the present invention is to provide a CT image display device that can simultaneously display an axial image and a scout image, and can immediately grasp where the axial image corresponds to the scout image, thereby improving diagnostic efficiency.

Another object of the present invention is that both the Axial image and the Scout image can be displayed simultaneously as the main screen or the sub-screen, and the sub-screen display can be arbitrarily turned on and off in real time, making it highly operable.
An object of the present invention is to provide a CT image display device.

Still another object of the present invention is to provide a CT image display device capable of independently performing window processing and level processing (hereinafter abbreviated as W/L processing) on the main screen and sub-screen.

The present invention consists of a main screen memory that stores Axial image data displayed on the screen as a video memory, and a main screen memory that stores Axial image data displayed on the screen, and a main screen memory that stores Axial image data displayed on the screen, and a
It consists of a sub-screen memory that stores Scout image data, sets the address of the sub-screen to be displayed and the address of the main screen in which this sub-screen should be embedded, and displays the sub-screen along the raster scan based on the screen address. It is determined whether the screen has reached the area where the screen is to be embedded, and while it is in the sub-screen area, a sub-screen select signal is generated and the address for the video memory is switched to the sub-screen memory address, and the sub-screen data read is the main screen data. It is characterized in that it is displayed after being subjected to a process that is determined separately from the process specified above, and that the sub-screen display can be turned on and off at will without damaging the main screen image. .

The present invention will be described in detail below with reference to the drawings. FIG. 3 is a configuration diagram of main parts showing an embodiment of a CT image display device according to the present invention. 10 is a screen address circuit that generates an address for the main screen and an address for the sub-screen, and 20 is an address selection circuit that receives the output of the screen address circuit 10 and generates an address for the main screen or sub-screen, and also generates an address for the sub-screen. When is selected, a sub-screen select signal is generated.
30 is a video memory, and as shown in FIG. 4, a main screen memory 31 stores image data for the main screen.
and a sub-screen memory 32 in which image data to be embedded in the main screen is stored. Axial images are pre-stored in the main screen memory 31, and Scout images are pre-stored in the sub-screen memory 32. 40
is a data processing circuit that processes data sent from the video memory 30 in real time. The data processing circuit 40 performs window processing and level processing, and the main screen memory 3
The output data from 1 is sent to one data processing circuit 41.
The output data from the sub-screen memory 32 is guided to a data processing circuit 42 which performs data processing suitable for the sub-screen data. A switch 50 selectively selects the output of the data processing circuits 41 and 42. Normally, the output of 41 is selected, and when the sub-screen select signal is issued, the switch is energized and selects the output of the data processing circuit 42. This is to select. 60 is a digital to analog converter (hereinafter referred to as
(abbreviated as a DA converter) converts the image data provided via the switch 50 into analog to obtain a video signal. 70 is a display device equipped with a display means such as a CRT, which displays the video signal as a visible image.

FIG. 5 is a block diagram showing details of a portion consisting of the screen address circuit 10 and the address selection circuit 20.
In this embodiment, an example is shown in which the X address of the main screen area in which the subscreen is embedded and the X address of the subscreen area to be embedded are the same address. In the figure, the screen address circuit 10 includes an X address counter 101 and a Y address counter 102 for generating addresses in the X and Y directions for the main screen memory space of the video memory shown in FIG.
It also includes a y start address register 103 in which the Y-direction start address for the sub-screen memory space is set, and a y-address counter 104 for generating a Y-direction address for the sub-screen based on the value of this register 103. .
Register 103 receives desired Y-direction start address data for sub-screen memory 32 from a microprocessor (not shown) via a data bus. On the other hand, the address selection circuit 20 has the following configuration. That is, a sub-screen on/off register 201 is used to set the on/off conditions for sub-screen display inputted from a keyboard (not shown), and the end addresses x and y of the sub-screen in the X and Y directions are set. x end address register 202 and y end address register 2
03, an X-cutting address register 204 and a Y-cutting address register 205 that respectively set the X-direction address and Y-direction address of the cutting address on the main screen, and the outputs of these registers and the output from the screen address circuit 10. an address judgment circuit 206 for detecting the timing to cut out the sub-screen and the timing to reach the end address of the sub-screen by comparing the address condition output from the address judgment circuit 206 and the sub-screen on/off A condition determination circuit 211 that determines the sub-screen ON condition of the register 201, determines whether the main screen data is read and displayed or the sub-screen data is read and displayed, and sends a predetermined control signal; The address switching circuit 212 selectively selects and outputs the desired address.

More specifically, the address determination circuit 206:
X address comparison circuit 209 and Y address comparison circuit 21 for detecting the timing of the cut address
0, an x address comparison circuit 207 and a y address comparison circuit 208 for detecting the timing of the end address of the sub-screen. The X address comparison circuit 209 is the X address counter 101
When the address read out exceeds the output of the X extraction address register 204, an X extraction signal indicating the X extraction timing is generated. Y address comparison circuit 2
10 generates a Y cutting signal indicating the Y cutting timing when the address read out from the Y address counter 102 exceeds the output of the Y cutting address register 205. When the address output from the X address counter 101 exceeds the output of the x end address register 202, the x address comparison circuit 207 generates an x end signal indicating the timing of the end address in the X direction of the sub screen, and the y address comparison circuit 207 generates an
08, the address read out from the sub-screen y address counter 104 is the y end address register 2.
When the output of 03 is exceeded, a y end signal indicating the timing of the end address in the Y direction of the sub-screen is generated.

The address switching circuit 212 receives the addresses output from the X address counter 101 and the Y address counter 102 as the main screen address, and receives the addresses output from the Y address counter 102 as the sub screen address.
It is configured to receive the address output by the y address counter 104.

The operation of the present invention in such a configuration will be explained next with reference to FIG. A keyboard (not shown) is used to specify the size of the sub-screen, the cutting position of the main screen, and the condition (by turning on or off) as to whether or not to display the sub-screen. The microprocessor reads these conditions and sets them in each register as follows.

(1) Set the start address for embedding the sub-screen on the main screen, that is, the cutting addresses X ₁ and X ₁ in the cutting address registers 204 and 205.

(2) Start address of the subscreen to be embedded in the main screen
Set y ₁ and y start address register 103. Note that in this embodiment, the start address _x1 of the sub-screen in the X direction is the same as the cutting address _X1 , and no new setting is required.

(3) Set sub-screen end addresses x ₂ and y ₂ to end address registers 202 and 203.

(4) Set the sub-screen on/off conditions in the sub-screen on/off register 201. This on/off condition can be changed independently as desired, thus making it possible to control on/off of the sub-screen display.

After the above register settings are completed, the X address counter 101 and the Y address counter 102 operate to sequentially read out addresses. One address of the screen memory specified by XY is 1 of the CRT display screen.
The memory address is specified according to the pixel scanning order. Address switching circuit 212 is X address counter 1
01 and the output of the Y address counter 102 are selected and applied to the video memory 30. The contents are sequentially output in the X direction from the upper left address of the main screen memory 31 of the video memory 30 configured as shown in FIG. processing) is performed. The processed data is converted into an analog signal via a switch 50 and a DA converter 60 to become a video signal, which is led to a CRT display 70 and displayed as a visible image. 1st stage X
When the scanning of the address in the direction is completed, the Y address is updated and the second stage address scanning is started, and the display is performed in the same manner as described above. The scanning proceeds in the same manner.

During this time, the comparison circuits 207 to 210 are constantly making comparison decisions, and when the addresses X and Y specify the inside of the cutout address area, that is, X ₁ Xx ₂ ,
When Y ₁ Yy ₂ , the X cutting signal and the Y cutting signal are generated simultaneously. The condition determination circuit 211 is
In response to these signals and the horizontal and vertical synchronizing signals H and V, a sub-screen select signal is generated, and the address switching circuit 212 is controlled to control the counter 10.
The address X of 1 and the address y of the counter 104 are sent out. As a result, in the cutout address area, the image data of the specified part in the sub-screen memory is read out instead of the image data of the main screen, and the data processed by the data processing circuit 42 is transferred to the switch switched by the select signal. through 50
It is sent to the DA converter 60. The subsequent operations up to CRT display are the same as for main screen display.

Addresses X and Y are the end address of the subscreen x ₂ ,
When _y2 is exceeded, the x-end signal and y-end signal are generated from the comparison circuits 207 and 208, which causes the condition determination circuit 211 to lower the select signal and return the address switching circuit 212 to its original state, that is, the output address of the counters 101 and 102. Return to the state where X and Y are selected. Note that the register 201
When the content of is off, that is, when the condition is that the sub-screen is off, the condition determination circuit 211 controls reading and display of only the main screen memory, regardless of the output of the comparison circuit.

In this way, as shown in Figure 8 B, the sub screen (Scout image) can be replaced and displayed in any rectangular area during the display of the main screen image (Axial image), and also when the Scout image display is stopped. As shown in FIG. 8A, the axial image of that part is displayed without any loss.

In addition, in the embodiment, the cutting address and the start address of the sub-screen in the X direction are the same, but they can be determined independently so that the sub-screen can be embedded in any position as shown in FIG. . Furthermore, the main screen memory space and the sub-screen memory space may be separate memory spaces due to the hardware configuration. Furthermore, the position and size of the sub-screen display may be fixed and the memory address for the sub-screen may also be fixed. In such a case, the register group described above becomes unnecessary, and the sub-screen display as shown in FIG. By assigning a select signal to an address, the main screen and sub screen can be displayed simultaneously.

It is also possible to store a Scout image in the main screen memory and an axial image in the sub-screen memory, and display the axial image embedded in a part of the Scout image.

As explained above, according to the present invention, it is possible to embed a sub-screen image in any position of the main screen image and display it simultaneously, so that the slice position and angle of the image can be determined on the axial image plane. A scout image showing the diagnosis can also be displayed as a reference, increasing diagnostic efficiency. Also,
When you erase the Scout image display, the Axial image in that area will be restored to the original image without being destroyed, so you can easily observe only the Axial image or
Observation based on the reference display of the Scout image can be switched as appropriate, and operability can be improved.

Another advantage is that the Axial image and Scout image can be processed separately in real time.

By making it possible to display the Scout image simultaneously in this way, when a photograph is taken of this screen and the photograph is used for diagnosis at a later date, it is possible to see at a glance which slice position the cross-sectional image is at, which is very useful for diagnosis.

[Brief explanation of drawings]

Figure 1 shows the Axial image, Figure 2 shows Scout
3 is a block diagram of an embodiment of the CRT display device according to the present invention, FIGS. 4 and 6 are block diagrams of an embodiment of the memory 30 shown in FIG. 3, and FIG. 5 is a block diagram of an embodiment of the memory 30 shown in FIG. An embodiment diagram showing details of the address selection circuit, FIG. 7 is another embodiment diagram for obtaining an address signal,
FIG. 8 is a diagram showing a display example. 1, 31...Main screen memory, 2, 32...Sub screen memory, 10...Address circuit, 20...Address selection circuit, 30...Video memory, 40...Data processing circuit, 50...Switch, 60 ...DA
Converter, 70...Display circuit, 206...Address judgment circuit, 211...Condition judgment circuit, 212...
Address switching circuit.

Claims (1)

[Claims] 1 In a CT image display device that reads CT image data stored in a video memory and displays it as a visible image, the video memory is divided into a main screen memory that stores Axial image data to be displayed on the main screen, and a Scout. It consists of a sub-screen memory for storing image data, a screen address circuit that generates an address signal for addressing the main screen memory and sub-screen memory, and an address for the cutout area of the main screen that has been set. an address determination circuit for comparing the address of the sub-screen area to be embedded in the cut-out area with the address signal and detecting the timing for first displaying the sub-screen; and an output of the address determination circuit and determining whether to display the sub-screen. a condition determination circuit that determines the sub-screen display on/off conditions indicating the sub-screen display and controls the addressing of the memory and creates a sub-screen select signal; a main screen data processing circuit and a subscreen data processing circuit that perform window level processing, and a switch that is energized by the subscreen select signal and selectively outputs the output of the two data processing circuits. The main screen is equipped with Axial
The Scout image is embedded in a part of the Axial image and displayed simultaneously by performing data processing separately from the image and the Scout image on the sub-screen, and the Scout image display can be turned on and off at will. A CT image display device featuring: