JPS59212742A - Radiation fluoroscopic examination device - Google Patents

Abstract

PURPOSE:To examine the defective condition of an object to be examined over the whole body with the same accuracy, by performing integration for different numbers of times in accordance with the examining position of the object to be examined and collecting data by arranging them so that their S/N ratio is uniformized. CONSTITUTION:An arithmetic section 18 makes integrating calculation on a current image data of a TV for X-ray and the previously calculated data of the 1st picture image memory 22 for every picture element based on an operation command signal from a system controller 19. The calculation data are stored in the 1st picture image memory and, at the same time, the calculation data of the arithmetic section 18 are stored in an address corresponding to an examining position of the 2nd picture image memory 23, when the calculation is made for a prefixed times in accordance with the examining position of the object to be examined. By collecting data by uniformizing S/N ratios which are different from each other depending on the examining position of the object to be examined and performing level judgement, the defective condition of the object to be examined can be examined.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiographic inspection apparatus that uses radiation to inspect a defective state of a subject, and particularly relates to a radiographic inspection apparatus that uses radiation to inspect a defective state of a subject. This invention relates to a radiographic inspection apparatus that uses image processing to uniformize the image.

[Technical background of the invention]

In general, radiographic inspection equipment irradiates a subject with X-rays from a radiation (hereinafter, radiation is specifically explained as X-rays) generator, and transmits fluoroscopic X-ray data from the subject to an X-ray television. - After receiving it in the system and converting it into a video signal, that is, image data, the image data of the previous line and the image data of the current line, which are sequentially stored in the image memory, are integrated for each corresponding pixel in order to improve the S/N ratio. The defect state of the object is inspected by performing image processing such as storing it in the image memory again and then comparing the levels of this image processing data.

[Problems with background technology]

However, when a subject is examined using the above-described apparatus, the following problems occur. For example, if defects X, Y, and Z of the same length occur on the surface of the object 1 as shown in FIG. In an X-ray television system that has shading, the defect signal Y at the center of the screen is large, and the defect signals X and Z at the periphery of the screen are small. Tsuma-nyo,
The 8N ratio is good at the center of the screen, but the SN ratio is poor at the periphery of the screen. This is because the amount of X-rays transmitted from the X-ray generator is large in the central area of the subject 1, and the conversion efficiency of the X-ray television system II is high in the central area. , the convergence of ranges is thought to be due to the fact that there is little in the center.

Therefore, when the image data in FIG. 2B, obtained by removing shading from the image data in FIG.

Z'? ii. Similarly, if a defect is determined by comparing at the threshold level L2, a defect Y' as shown in FIG. 2C is obtained. This means that even if the sizes of the defects x, y, and z occurring on the surface of the object 1 are exactly the same, the defects x', y', and z may differ depending on the inspection position of the object 1. There is a problem in that the defect inspection accuracy is not uniform between the inspection positions because the defects are different in size (Δ1+>Δtz).

[Purpose of the invention]

The present invention has been developed in view of the above-mentioned circumstances, and it is possible to collect image data with a uniform S/N ratio despite differences in the inspection position of the object, thereby inspecting defective states with uniform inspection accuracy over the entire object. The purpose of the present invention is to provide a radiographic inspection device that can perform the following tasks.

[Summary of the invention]

In the present invention, based on a calculation command signal, a calculation section calculates current image data of an X-ray television system and previous calculation data of a first image memory stored for each calculation pixel by pixel or line by line. The calculation data is stored in the first image memory, and when the number of calculations reaches a predetermined number according to the inspection position of the subject, the second
The calculation data of the calculation unit is stored in the address corresponding to the inspection position of the image memory of the object, the data is collected by uniformizing the S/N ratio that varies depending on the inspection position of the object, and the level is determined to determine the defect state of the object. This is a radiofluoroscopic inspection device that inspects.

[Embodiments of the invention]

FIG. 3 is a configuration diagram showing an embodiment of a radiographic inspection apparatus according to the present invention. In the figure, 11 and 12 are an X-ray generator and an X-ray television system,
A subject 13 is placed 6 between them. The X-ray television system 12 has an X-ray generator 11 and a subject 13.
The image data (
Specifically, it converts fluoroscopic X-ray data into electrons and then converts them into visible light images.
For lines 1. I1.21, a lens 122, and a television camera 123 that captures a visible light image input through the lens 122 and outputs it as image data. 14 is an X-ray television system 1
The amplification circuit 14 amplifies the output image data, and the amplified output of this circuit 14 is sent to an A-D converter 15 and a synchronous separation circuit 16. This synchronization separation circuit 16 extracts a horizontal synchronization signal H from the image data including the scan signal output from the X-ray television system 13.
D and vertical synchronization signal VD are separated and sent to the memory controller 17. On the other hand, the A-D converter 15 converts the level of serialized data in the horizontal line direction by horizontal scanning into a numerical value of, for example, 8 bits and 256 gradations for each pixel, and then sends the converted data to the calculation unit 18. Reference numeral 19 denotes a system controller that provides calculation command signals to each part of the device, and the signals outputted from this are sent to the memory controller 17, the calculation section 18,
The data is supplied to the memory specifying section 20 and the image processing section 21.

Under the command of the system controller 19, the controller 17 gives a write command to the first image memory 22 based on the synchronization signal from the synchronization separation circuit 16, and reads each output from the calculation section 18. Stores data for each pixel of a line. The calculation unit 18 is a system controller 19
Adding the previous specific pixel data of the same line and the current specific pixel data from the A-D converter 15 (the image data of the X-ray television system is a still image) based on the integration command from Perform the integral process of
It is then written into the image memory 22 again. The memory specifying unit 20 specifies in advance the area 4A of the subject 13 shown in FIG.
The number of calculations such as integration is set for each of , B, and C. The number of calculations is determined from the signal from the system controller 19, and when the number of calculations reaches the set number, the memory controller 1
This is to send a signal specifying the area range to 7. The memory controller 17 outputs an address signal based on the output of the memory specifying section 20 and controls the data of the calculation result of the calculation section 18 to be input into the second image memory 23 .

This operation is repeated until the maximum number of times set in the memory specifying section 20 is reached. Therefore, each area A is stored in the second image memory 23.

Data with a different number of calculations for each area B and C, and data whose S/N ratio is made uniform by different integration amounts for each area A, B, and C are stored.

The first image processing unit 21 reads data from the second image memory 23, performs shading removal processing and level comparison, and determines the presence or absence of a defect, and if there is a defect, based on the determination result (not shown). For example, a signal indicating that the subject 13 is to be excluded is output. 24 is a D-A converter 1. z
s C is an amplified IM circuit, and its amplified output is sent to a display section as image data (not shown).

Next, the operation of the device configured as above will be explained.

For example, a circular object 13 is divided into areas A and C from the inside to the outside as shown in FIG.

Considering that it is divided into B, area A is a circular body with a radius rA as shown in FIG. 5A, and area 0 has an inner diameter r as shown in FIG. 5C. 1. An annular body with an outer diameter of rc2, area B has an inner diameter of rB+ and an outer diameter of rB as shown in Figure 5B.
It becomes a ring-shaped body with □. Therefore, each area A, B, C
The difference in SN ratio for each area is determined in advance, the number of addition operations for each area A, B, and C is determined, and the number of addition operations for each area A, B, and C is determined in advance.
, C. The settings for areas A, B, and C at this time specify the distance from the center and the number of addition operations N.

For example, area A:rA.

N1, area B: rBl rB, , N2, area c: r,, rct, Ns.

After setting a predetermined value in the memory specifying section 20 as described above, the system controller 19 sends a message to each section 17 and 18.
．． Give the necessary commands to 20 etc. Now, N1=2, N, -
4, N, = 3, and when the system controller 19 issues the first calculation command, the calculation unit 18 combines the data of the first image mail 22 and the output data of the A-D converter 15. The data is stored in the first image memory 22 under the control of the memory controller 17 while performing integral calculations such as addition for each pixel of each line. At this time, the previous data does not actually exist in the memory 22, so 1. The data from the A-D converter 15 is sequentially stored in the first image memory 22.

Next, the system controller 19 issues a second integral calculation command. In response to this, the memory specifying unit 2o determines that the set number of times for area A has been reached, and sends a signal for a prespecified area range 4, that is, a signal corresponding to the distance rA from the center to the memory controller 17. here,
The memory controller 17 sends an address signal to the second image memory 23 based on the signal from the memory specifying section 2. On the other hand, the calculation unit 18 converts the output of the A-, -D converter 15 from the second scan and the data in the first image memory 22 obtained from the first scan on the same line based on the second integral calculation command. The data is written into the first image memory 22 while sequentially performing integral calculations such as addition for each specific pixel. The second image memory 23 stores calculation result data at the designated address only when the address is designated by the memory controller 17.

Subsequently, when the system controller 19 issues the third and fourth integral calculation commands, the data of area C is imported into the second image memory 23 for the third time.
At the fourth time, the data of area B will be taken into the second image memory 23 in the same way. As a result, the second image memory 23 stores S between each area A, B, and C.
This means that data with a uniform N ratio has been obtained. Therefore, the data after shading removal in the image processing unit 21 is as shown in FIG. In the case of a specimen with defects, it can be extracted as a defect of the same size as shown in Figure 6B.If the pick, defect x, y, and z are the same size, the defect can be extracted as shown in Figure 6B. This can be detected as a defect with a width of Δtx - Δty - Δtz.

Note that in the present invention, circular and annular areas are designated, but by changing the address designation when storing in the memory 23 in addition to the second image, it is possible to change the number of addition operations for any area and store it in the same memory 23. It can be memorized. Also,
In the above embodiment, the A-D converter 15 digitizes the data and performs the necessary processing.
If an analog memory such as an accumulator is used as the memory 22 or 23, the required processing can be performed using analog signals without digital conversion. In addition, each area A,
Although the addition calculation data for each of B and C is temporarily stored in the second image memory 23, it may also be sent directly to the data processing section 21 for predetermined processing. Further, although an integral operation such as adding the current data and the previous data is performed for each pixel, a matching calculation may be performed for each -line. It goes without saying that radiation other than X-rays may also be used). In addition, the present invention is not limited to the above embodiments, and can be implemented with various modifications.

〔Effect of the invention〕

As described above in detail Fj2, according to the present invention, data is collected by performing integration at different times depending on the inspection position of the subject and aligning them so that the S/N ratio is uniform.
It is possible to provide a radiographic, inspection, and inspection device that can inspect the entire defect state of the object with the same accuracy and eliminates the possibility of overlooking defects depending on the inspection position as in the past.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a defective state of an object to be inspected; Fig. 2 is a waveform diagram illustrating a malfunction of a conventional device; Fig. 3 is a configuration diagram showing an embodiment of a radiographic inspection device according to the present invention; 4 and 5 (4), (B). (e) is a diagram when the subject is divided into multiple areas,
The figure is a waveform diagram illustrating data processed by this device. DESCRIPTION OF SYMBOLS 11... X-ray generator, 12... Television system for X-rays, 13... Subject, 16... Synchronous dividing circuit, 17... Memory controller, 18-°・performance m
Hll 9...System controller, 20-Memory specifying unit, 21...Image processing unit, 22...Mud 1 image memory, 23...Second image memory. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] A data conversion means that irradiates a subject with radiation and converts the fluoroscopic radiation data transmitted from the subject into image data while scanning it with a radiation television system and outputs it, and outputs a 1-stone command signal. A system controller receives a calculation command signal and converts the current image data obtained by the data conversion means and the previous calculation data stored in the first image memory for each corresponding pixel or The system includes a calculation section that performs an integral calculation for each corresponding line and re-stores the calculation data in a first image memory, and a signal that represents the number of calculations and the examination position according to the examination position of the object. - A memory designation section that outputs a signal representing the inspection position every time a preset number of calculations is reached based on the calculation command from the controller, and a memory designation section that outputs a signal representing the inspection position based on the calculation command from the controller, and the calculation of the calculation section is sent to the address corresponding to the output signal from this memory designation section. a second image memory for storing data; and a radiographic fluoroscopic examination apparatus, characterized in that the 8N ratio of the image data, which varies depending on the examination position of the subject, is made uniform by the number of calculations.