JPS59133790A - Processor of x-ray picture - Google Patents

Abstract

PURPOSE:To change the matrix size by calculating a digital video signal read out of plural frame memories and writing the calculated output signal into a frame memory to display concurrently. CONSTITUTION:An image pickup tube 5 supplies an X-ray transmissive image amplified by an image intensifier 4 to an X-ray picture processor 6. The video signal supplied to the processor 6 is converted into another video signal by an A/D converter 7 and undergoes the logarithmic amplification through an LOG amplifier 8. The video signal supplied from the amplifier 8 is written to either one of frame memories 9. At the same time, the video signal supplied from either two of the frame memories which are not under writing are supplied to an operation means 10 or 11 and calculated there. The output of the means 10 or 11 is written again to the memory 9 via a data bus 18 or supplied to a video memory 12. The memory 12 stores the video signal equivalent to one frame and at the same time supplies to a D/A converter 13. The converter 13 supplies its output to a display device 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an X-ray diagnostic apparatus, and particularly to an X-ray image processing apparatus that obtains more suitable circulatory organ images through digital image processing.

[Technical Background of the Invention] This type of device is described in detail in Japanese Patent Application Laid-open No. 58682/1982. This publication discloses two imaging methods. One is the mask method, which uses a difference between the image of the patient injecting the contrast agent (mask image) and the image after the active contrast agent has been injected, to obtain images of blood vessels, etc. that contain the contrast agent. It is something to emphasize.

The other one is T.I.D.
Images are captured continuously using a method called the 1D1ferece method, and the difference between the previous image and the subsequent image is sequentially subtracted, thereby making it possible to capture, for example, temporal changes in the heart.

In this publication, the contrast resolution is increased by digitizing the image, and the temporal resolution is increased by performing image processing in the television field. In other words, it has been shown that even objects with a small contrast difference can be clearly identified, and that image diagnosis can be performed in real time.

It is also important that noise is reduced by integrating images, that is, by adding multiple images.

[Problems with Background Art] The apparatus disclosed in this publication is equipped with three frame memories and is designed to be able to perform the masking method and the TID method alternatively. However, with such a device, it is impossible to double the matrix size per image and increase or cover the resolution.

[Object of the present invention] An object of the present invention is to provide an X-ray image processing device that can change the matrix size by a control signal as necessary.

[Summary of the Invention] To achieve this object, the present invention provides an A/D converter for converting an analog video signal of a television field into a digital video signal, and a common input bus and at least two output buses. connected, this A/D
a plurality of frame memories for accumulating digital video signals from the converter; a computing means for computing the digital video signals read out from different frame memories onto these two output buses; The present invention is characterized in that it is provided with means for writing into one of the above, and display means for displaying the calculated output signal on a television field.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment.

The X-ray tube 2 is
emits X-rays toward the subject 3. The X-rays that have passed through the subject 3, that is, the X-ray fluoroscopic image, are amplified by the image intensifier 4. Then, the IS tube 5 converts this amplified XwA fluoroscopic image into a television field video signal of, for example, 30 frames/second, and supplies it to the X-ray image processing device 6.

The video signal supplied to the X-ray image processing device 6 is first converted into a digital video signal by the A/D converter 7, and logarithmically amplified by the LOG amplifier 8. The image processing device 6 includes frame memories 9 (#1 to #128) each having two inputs and two outputs. The respective inputs and the respective outputs of this frame memory 9 are connected to data buses 17, 18 and 1.
It is connected in common with 9.20. The video signal for one frame supplied from the LOG amplifier 8 is written to one of the frame registers 9. Also, any second of these frame memories that is not being written to.
The video signal is transmitted through one data bus, 18
It is supplied to U1o or AL'U11. ALUlo or ALUll performs an operation such as addition or subtraction on the video signals respectively read from the two frame memories. The outputs of ALUlo and A'L tJ 11 are written back to frame memory 9 via data bus 18 or fed to video memory 12.

A video memory 12 stores a video signal for one frame and supplies it to a digital-to-analog converter (DAC) 13. The DAC 13 converts this video signal into an analog video signal and supplies it to an external display device 15. A display device visually displays this video signal on a television field. Further, the memory ALU controller 14 specifies the write frame memory 9 and its write address, and specifies the read frame memory 9 and its address in synchronization with a video synchronization signal supplied from the television camera 5. At the same time, memory A L
The U controller 14 also performs timing control of ALUlo and ALUll and timing control of the video memory in synchronization with the video synchronization signal.

This frame memory 9 can be configured as shown in the block diagram of FIG. 2, for example. As shown in the block diagram of FIG.
．． Buffers 91 and 93 for temporarily holding digital video signals from 18 are provided. These buffers 9
1 and 93 are connected to an input selector 95. The input selector 95 selects one of the digital video signals held in the buffers 91 and 93, or cuts off both, according to input selects 1 to Shintan from the controller 14. This input selector 95 is connected to a memory 97 and supplies the selected video signal to the memory 97. The memory 97 has a capacity of, for example, 256 x 256 x 16 bits, and has a capacity of WE (Wri) supplied from the controller 14.
te ['nable), RAS (ROW A
dress 5 trove), CAS(Colu
The video signal is written and stored at the address specified by the address signal also supplied from the controller 14 under the control of the mn Address 3 trove > signal. In addition, this memory 97 has RAS, CAS
The video signal written in the address controlled by the address signal is read out and supplied to buffers 98 and 99.

Buffer 98 and buffer 99 are connected to data bus 19 and data bus 20, respectively.

Then, both of the data held in the buffer 98 and the data held in the buffer 99, or only one selected one, is read out to the data bus by the read control signals supplied from the controllers 1 to 14. This read control signal also interrupts reading from the buffers 98 and 99 to one data bus 20 by 1M as necessary.

Further, ALUlo and ALIJll are configured as shown in the block diagram of FIG. 3, for example. △L U 10
is a circuit for integrating an image. one data bus,
Two series of video signals from 20 are supplied to an adder circuit 101. Addition circuit 101 adds these two series of video signals and supplies the output to division circuit 102 . A divider circuit 102 divides the output of the adder circuit 101 by 2 to keep the dynamic wrench constant. The output of this divider circuit 102 is temporarily held in an output buffer 103, and the controller 1
4 control signals are supplied to the data bus 18.

ALU1 is a circuit for 1111 to 1111 of images. The video signals on the data bus 19 and 20 are supplied to a subtraction circuit 111. A subtraction circuit 111 performs subtraction on the video signal and supplies its output to an output buffer 112. The output buffer 112 temporarily holds this output,
The signal is supplied to the data bus 18 in response to a control signal from the controller 14.

ALUlo or AL supplied to this data bus 18
The output of Ul1 is either written to the frame memory 9 again or co-supplied to the video memory 12.

Next, the operation of this embodiment will be explained with reference to the time chart of FIG. First, an x-ray image of Moe injecting a contrast agent into the patient is seen through and provided in a continuous television field. The first frame image is stored in the frame memory 9#1, and the next second frame image is stored in the frame memory 9#2 via the data bus 17. Third
Frame images are stored in frame memory 9#3 via data bus 17. At the same time, the images stored in the frame memories 9#1 and #2 are transferred to the data bus 19.20.
is supplied to ΔLU10 via.

ALUIO adds the images of the first frame and second frame and sends the result to the frame memory 9# via the data bus 18.
Write to 128. At the same time that the image of the fourth frame is written to frame memory 9#4, frame memory 9#3
The image #128 is tightened and stored in frame memory 9 #12.
7 is accumulated.

In this way, for example, images for 30 frames, which is equivalent to one heartbeat cycle, are stored in the frame memories 9#1 to #30, and at the same time, the images are integrated to form a so-called mask image. This mask image is stored in frame memory 9#128.

Next, when the image into which the contrast agent is injected appears from the 31st frame, for example, the 4 frames 31st to 34th are integrated in the same way as the mask image, and the frame memory 9#
127. And at the 36th frame,
The images in frame memory 9 #128 and #127 are transferred to the ALU
ll, navtraction, and the video memory 12. This subtracted image is then displayed on the display device 15.

In this way, the original image for integration and subtraction can be stored in the frame memory, and for example, even after fluoroscopy is completed, the fluoroscopic image can be diagnosed and image processing can be performed again.

In addition, as shown in the time chart in Figure 5, if the sampling of ADC 7 is increased four times and one frame is stored in four frame memories, the result will be 512X512X16.
The same image resolution as when using a bit frame memory can be achieved.

Moreover, the expansion of the frame memory 9 requires that the controller 14
This can be easily done within the control range of , and the storage capacity of original images can be improved. Further, an ALU such as an image filter can be easily provided between the data bus 19.20 and the data bus 18.

Although the operation of this embodiment has been explained using the mask method, the TID method can also be performed by changing only the control of the controller 14.

The present invention is not limited to the embodiments described above; for example, if it is not necessary to process images at the same time as fluoroscopy, only one input bus to the frame memory 9 is required. Well, when there is no need to store original images, the number of frame memories 9 can be reduced.

[Effects of the Invention] As described above, according to the present invention, the capability of the hardware of the image processing device can be changed only by the control signal of the controller, and the hardware can be configured according to the purpose of diagnosis. Possible X-ray image processing! l! equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a block diagram of a frame memory in the same embodiment, FIG. 3 is a block diagram of ALLI in the same embodiment, and FIGS. 4 and 5 are the same. FIG. 3 is a time chart diagram for explaining the operation of the embodiment. 6......X-ray image processing device 7...
...A/D converter 8...LOG amplifier 9...Frame memory 10...ALU 11...・・ALLl 12・・・・・・・・・Video memory

Claims (1)

[Claims] at least one A/D converter for converting an analog video signal of the television field into a digital video signal;
a plurality of frame memories which are commonly connected to one input bus and at least two output buses and which store digital video signals from the A/D converter and which are read from different frame memories to these two output buses; and means for writing the calculated output signal into one of the frame memories, and display means for displaying the calculated output signal on a television field. Characteristics of the X-ray image processing device.