JPS60111635A - X-ray photographing apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an X-ray imaging apparatus that captures and displays an output image of an image intensifier using an image pickup tube.

C. Background Art and its Problems] In recent years, digital radiography has been combined with X1# imaging devices, especially medical X-ray diagnosis devices.

This digital radio technology is X#3 that has passed through the subject! After converting the image into a digital code and processing the image for each axis, it displays various images that are useful for medical assistance. The problem with this X-ray imaging tube is that an image intensifier (hereinafter referred to as 11) is used in the X-ring image receiving device.

When the X-rays that have passed through the subject reach the input surface, a fluorescent substance coated on the optical surface of the input surface, for example, C.
8, etc. emit light, which causes electrons to be emitted from the photoelectric conversion material spread on the back side of the input surface, and the emitted electrons are accelerated by the pressure applied to the constant electrode. The light collides with the phosphor on the output surface, and zero fluorescein is output on the output surface. ■ Conventional small-diameter image pickup tubes that receive the output fluorescence image from the input tube have an input tube diameter of about 1 inch, so it is necessary to obtain 500 to 1000 scans.
It was expensive. In addition, the beam diameter had to be made small in consideration of the scanning line, and the frame speed and beam scanning speed were limited due to the TV image, making it impossible to obtain a large contrast dynamic range. However, enlarging the input surface of the image pickup tube with the same scan line and frame rate ATRC is useful for increasing the dynamic range, but it also increases the beam scanning speed and causes afterimages. This resulted in deterioration of the characteristics.

By the way, when photographing a human chest S, when trying to obtain an X-ray image of the chest with - times of X-ray photography, at least
The image receiving area of 35an x 45Cn1 is necessary, and ■・I
For this purpose, a human force surface diameter of 22 inches (55 cm) is required, which is 12//1. In order to have the same resolution as i, it is necessary to have an output surface diameter of 5 inches (12.5 crn). According to the output surface diameter of 5 inches, the large-diameter image pickup tube is a human-powered 5-inner (12,5c1n).
), the resolution and contrast dynamic range will either be improved compared to when a small-diameter image pickup tube is used, or the following problem will occur. That is, currently the TV screen is scanned at 3° frames per second and 2 fields per frame. In other words, one frame is 33m5e
c(±x2sec)0 Simulated. At this speed, the input surface diameter is 5 inches/(12
, 5Crn) image pickup tube, and the same size I as the conventional one.
l! When attempting to obtain lI elementary information, the time required to collect information per pixel is (4) 2 = 0.0144 times that of using a human-powered imaging tube with a 6-inch diameter. The bandwidth of the preamplifier and other components that amplify the frost 1 air signal coming out of the tube must also be adjusted accordingly. On the other hand, if scanning was performed at the same beam speed as in the past, it would take 2.3 beds. When scanning at such a speed, even if a residual material is used between the output surfaces of ■ and ■ or the human power of the image pickup tube, the optical cover will inevitably deteriorate at the end of the scan (7.1). , if the output correction of large diameter It is.

[Purpose of the invention]

Akira Honmaru was made based on Aijki 4J A, +t. Our aim is to provide an X-fine photographic equipment that will enhance the data output by having an 11-sided armpit, sufficient resolution, contrast dynamo, and mink range.

[Small tremor of invention]

7t- In order to achieve the above object, the invention arranges two unique image pickup tubes in an X-ray imaging device, and manually transmits images from the image intensifier to separate imagers for fluoroscopy and imaging. 48FW is defined as 48FW. Furthermore, in an X-ray imaging device, one image pickup tube and a lens group placed just before the image pickup unit are arranged, and the size of the field input to the image pickup tube by this lens group is determined at the time of fluoroscopy and at the time of imaging. Symptoms include wheezing.

Furthermore, the fact that the inspection ridges that appear during fluoroscopy and during photography are different, and that the image body and 9-in-one time for one frame are different is assumed to be ff: vessel constant.

[Example of Uαsu]

Next, an explanation will be given of an X-ray imaging system that incorporates digital radiography, which is used in the present invention and an imaging system, with reference to Fig. 1.

As shown in FIG. 1, after the X-grasp emitted from the X-ray tube 1 passes through the subject 12, the image intensifier (
1・■) Accepted by 2. ■・The output light of 12 is converted into an electrical signal by 41(&%f3 in the TV camera. The X-ray image is visualized on the TV monitor 4 based on this electrical signal.('υ(h The frost vaporization signal output from 'fn' 3 is output to the TV monitor 4, and the A/b
The signal is output to an i-converter 5 and converted into a digital signal.

The digitized number is once stored in the video recording device 6, for example, l.
It is stored in C memory, videotask, etc. The image consisting of the digitized code recorded in the image recording device 6 is subjected to image processing by the central control device 7. The image processing includes, for example, a contrast level conversion process, a region of interest selection and its enlargement process, Various types of processing are applied, such as edge enhancement processing, fixed image removal processing, and miscellaneous image removal processing, which are essential for enhancing the 1°h report. Further, this central control device 7 not only performs the various image processing operations described above, but also controls the entire X-ray imaging apparatus. In the central control unit 7, the image-processed video signal is converted into a video image and displayed on the costume. This display device 8 can also be replaced by a television monitor 4. ri! Of the video signals subjected to Il image processing, those that are necessary for recording and storage are recorded in the video storage device 9 as digital ITh numbers, and
It will be preserved. Figure 1 shows the general outline of an X-ray imaging device that combines digital radiography and has a basic design. A photographing device is configured.

Next, the image intensifier (engineering/■)-imaging tube according to the present invention will be explained.

In FIG. 2, two image pickup tubes 31 and 32 with different ratings are provided on the child member opposite to one I2.

The Xi-12 has a rating such as a 22 inch Xi input surface and a 5 inch output surface. The image pickup tube 31 has a large input surface, such as a 5-inch input surface, and the output obtained from the image pickup tube 31 is used as a video signal for digital radiography. The image pickup tube 32 has an input surface of 1 inch, is of conventional performance, and has an output of C'5.
It is connected to an X-ray TV and observed as a fluoroscope. However, it goes without saying that the dimensions described here are not limited to just one shift. ■・I2 and imaging lens = 31.
32, there is an imaging lens 31 that captures the output fluorescence f& of I2.
-! Alternatively, a switching means for inputting the image to the image pickup tube 32 is provided. This switching means Q, lens group 40.41
．． 42 and a group of mirrors 50, 51.52, and the lens +4.0 has the lens 41 perpendicular to the output surface ψ of ■I2.
Immediately before entering the image pickup tube 310 (n1), the lens 42 is placed in the 6f position of the image pickup tube 320. Mirror 50 is l
@ Placed on the extension line of the direct expansion connecting I2 and lens 40,
■・900 to invert the output sound from I2
° Rotatably provided. The mirror 51 is the image pickup tube 3
The mirror 52 is tilted at 45° on the extension of the straight line connecting the lens 41 and the lens 41, and the mirror 52 is tilted at an angle of 45°, which is the same as the extension of the straight line connecting the image 32 and the lens 42. , reflected light from mirror 50? II- arranged to receive.

Next, the second floor constructed as described above - ■ and ■ according to the invention -
The action of the pseudotube will be explained.

During perspective viewing, the right side 1 of the mirror 50 is placed at 945° (the intended position in the figure). mirror 50
The reflected light from the mirror 52 changes its course in the blood angle direction, passes through the lens 42, and enters the image pickup tube 32. The X-ray image obtained from this imaging tube 32 is displayed on an X-ray TV.

Next, at the time of imaging, when the subject's body part comes to the appropriate imaging position, the X-ray irradiation is temporarily stopped and the mirror 50 is rotated to a position where the upper right corner is 945 degrees. (The position indicated by the solid line in the figure) An X-ray is instantaneously irradiated there, and the scratches are stored as an output image on the I/G 2 for a while (about 2 seconds). (2) The output of the lens 40 is applied manually to the mirror 50, and the reflected light from the mirror 50 is input to the imaging device 31 after passing through the mirror 5 lens 41. This J7IIlft
The output from the Z tube 31 is used as a video signal as a so-called digital stereograph. The iJt output speed is not the normal operation of an image pickup tube, in which the image (6) is read out in 1/30 seconds, but it should be within the comparison range of 0.5 seconds to 1 second.

In the above-mentioned embodiment, the vessel Pu for imaging and the vessel 1J4 for fluoroscopy are used.
Although the tubes are provided separately, in the embodiment described above, the same imaging tube is used for imaging and fluoroscopy. In FIG. 3, (1) - The device 2 and the image pickup tube 33 are provided facing each other, and relay lenses 43 and 44 are placed between them.

In this case, the imaging %33 does not scan the same human power iM+ during imaging and fluoroscopy, but scans with the number of sieve scans during imaging as described above, but the fluoroscopy plane is In the same way as 525 lines, about 1024 lines are scanned once and observed as an X-win TV on the oil surface.

As the irradiation field for this removed @ donor body, there are two methods: a method of focusing on the same screen during imaging and fluoroscopy, and a method of focusing on a narrow area during fluoroscopy (as in imaging). Read the effects in this case in order.

(1) Inject the same irradiation field as that used for imaging into the fluoroscopic plane; method 15 This can be seen in the following two methods (aJ, (b)).

(How to praise the output part of 1. engineering during aJ photography and fluoroscopy.

When photographing, an output image 61 of the input image 60 is formed on the output surface of 1.
&'133 is inputted as the foreigner 62.

Next, during fluoroscopy, by dissipating the 111 pressure in the part 2, the image 60 is projected onto the output section as an image 63.

This is inputted to the fXX blind tube 33 as an image 64 via the lenses 11j43 and 44e.

At this time, the size of the image is made to have the appropriate number of scanning lines and scanning speed as a TV perspective image, and the area is divided under nine predetermined conditions, for example, 525 scanning lines, frame scanning speed 1/
The frost beam deflection of the image pickup tube is changed so that the image is scanned at a rate of 30 frames per second (one frame is a two-field interlace method).

(How to change the scanning of the image pickup tube during bJ imaging and fluoroscopy■・
I2's? Lens thread 43 without changing the 4i polar voltage.
．． In addition to 44, during fluoroscopy, second lens threads 45 and 46 are inserted to tightly project the 12 images onto the center of the input surface of the imaging tube 33.

Then, in order to scan only this part f:1 of the image pickup tube,
Change the frost and temperature of the magnetic coil and apply it.

(2) A method in which the irradiation W is smaller during fluoroscopy than during imaging.

This allows the image pickup tube 3 to remain unchanged during fluoroscopy using the irradiation field at the time of imaging.
3, and the scanning of the image pickup tube 33 is performed on the center spring 33 as well as the Mj term. This is a method of outputting to a TV.

[Effect of investigation]

As described above, according to the present invention, in order to obtain a perspective image,
Because it uses a normal image pickup tube with an input surface of about 1 inch,
-The information collection time per pixel is the same as before, and there is no problem of residual satisfaction. Also, in order to obtain signals for digital radiography, do you need to take an image with a large force surface of about 5 inches? - Since he uses ``-'', he is able to achieve 4,000 wins. Therefore, the h-mode L contrast and dynamic range are improved compared to when using a small-diameter camera arm. Therefore, the photographic data, which has lost its immediacy due to the large irradiation seal, is immediately processed as a digital signal and immediately subjected to i[111 correction processing to be applied to a CRT or film. It is possible to perform an

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an X-ray imaging device combining digital radiography according to the present invention, and FIG.
Image intensifier (■・1) according to the present invention
- A block diagram showing an embodiment of the imaging tube, "Third path" is
FIG. 3 is a block diagram showing another embodiment of the image intensifier-image pickup tube system according to the present invention. 1... X-ray tube, 2... Image intensifier, 3, 31, 32, 33... *image v, 4... Television monitor, 5... A/D converter, 6・・・Video recording device color＼ 7...Synopsis control device, 8...Costume device, 9...Video storage device, 4o, 41, 42, 43
・44・45・46・・Lens thread, 5o・51・52・
...Mirror thread. Agent: Patent Attorney Noriyuki Chika (1 person) Condolences 1 Figure 8 9

Claims (1)

[Claims] (An image intensifier that displays a transmitted image by υ χ rays by amplifying its brightness, and an image of an image intensifier that has been scientifically incorporated into the 11th Kesen issue. In the X-ray imaging device that supports the image pickup tube, during fluoroscopy, the output +3 of the image pickup tube is converted into a television signal and displayed on X-ray TV, and during field shadowing, the X-ray transmitted image is transmitted using an image intensifier. 92 by Ku'tun Shunkan on the input surface of the image pickup tube through the
4. Frost and material 4 also accumulate as sexual changes, read out this accumulated data by scanning the single beam, convert this extracted data into digital signals, and perform image processing 1.
An X-ray imaging device that displays a still image on a cathode ray tube or film after performing 1. (2) The imaging tube frame scanning speed during imaging is slower than the imaging tube frame scanning speed during fluoroscopy. The 11th imaging technique and the 2nd imaging used during imaging 1.
#tF characterized by being different from wisdom: Jf
f iI'1 Ice Range The X-ray imaging apparatus according to item 1. (4) the image intensifier; The X-ray imaging apparatus according to claim 3, characterized in that a switching stage is provided between the second imaging tube and the second imaging tube. (5) The X-ray imaging apparatus according to claim 4, wherein the switching means is a group of mirrors. (6) The scope of Okina's theory that the first image pickup tube used for fluoroscopy and the second J6 image tube used for imaging are the same, as described in paragraph 1. Imaging device-0 (7) A claim characterized in that a lens coarser is disposed between an image intensifier and an image pickup tube, and the magnitude of the image input to the image pickup tube is controlled by this lens group.