JPS6137138A - Three-dimensional x-ray television 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 [Technical Field of the Invention] The present invention belongs to the technical field of a three-dimensional X-ray television apparatus that can three-dimensionally observe the interior of a subject using X-rays.

[Technical background of the invention and its problems] Conventionally, in a stereoscopic X-ray television apparatus, a subject is alternately exposed to X-rays from one X-ray source in two xIl tubes or one xsii tube. The transmitted and transmitted X-rays transmitted through the subject are converted into visible light by a visible light image conversion device such as an image intensifier (■・I), and the resulting visible light is converted into 1
The slope that enables good stereoscopic viewing in a stereoscopic X-ray television set that receives light with a basic imaging device such as a vidicon must be free of afterimages of visible light images. If an image sensor with an afterimage receives a new visible light image, two X
This is because visible light images in two directions based on the ray tube are mixed, and the three-dimensional effect in images displayed on the television is inhibited.

By the way, some types of image pickup devices, such as vidicon, have afterimages, and it usually takes 50 m8 or more for the afterimages to disappear to the extent that they do not pose a practical problem. Therefore, in order to prevent the three-dimensional effect from being inhibited by the mixture of the afterimage and the visible light image, it is necessary to set the X-ray irradiation interval between the two X-ray tubes to 50 m5 or more.

However, if the X-ray exposure interval is 50m5 or more,
If the shape of the object is changing at a high speed, the visible light images obtained by taking X-rays from two directions will be different, making it impossible to obtain good stereoscopic vision of the object. It disappears.

Originally, ideal stereoscopic vision is possible by observing the form of the subject at a certain moment simultaneously and separately with the left and right eyes. 3D X where X-rays cannot be emitted from the X-ray source at the same time
In line television equipment, the interval between xms shots must be as short as possible. Furthermore, in order to enable good stereoscopic vision, the image seen by the right eye and the image seen by the left eye must be completely separated.

Therefore, in order to solve the above problem, the applicant
We proposed a three-dimensional X-ray television device according to Patent Application No. 203198 of 1981, a pulse X-ray diagnostic 'I device according to Patent Application No. 150980 of 1988, etc.

However, in each of the above-mentioned proposed devices, there is a lot of loss at the front end due to the half mirror and electronic shutter used, so it is necessary to make the optical system lens as bright as possible, and the functions of the two television cameras used must be Adjustment to make them identical to each other is difficult and takes a long time, and furthermore, new problems arise in that the cost of the entire device increases.

In order to solve these problems, the applicant further proposed a method using one television camera in Patent Application No. 115388 filed in 1982, but previously, the imaging position of the output image of the image intensifier was There are drawbacks such as difficulty in achieving uniformity of the deflection magnetic field that deflects the magnetic field, and the large size of the deflection coil.

[Objective of the Invention] The present invention aims to provide a stereoscopic X-ray television apparatus that allows easy and accurate stereoscopic viewing of a subject without using a half mirror, an electronic shutter, or two television cameras. This is a characteristic feature.

[Summary of the Invention] The main point of this invention to achieve the above object is that X-rays are obtained by irradiating a subject with X-rays from left-circle and right-circle X-ray sources arranged at a predetermined interval. In a 3D Xa television device that enables stereoscopic viewing of a subject image by converting an X-ray image into an optical image using an image intensifier and capturing this image with an X-ray television camera, an image-forming imaging tube is used as the IIIIIII tube. , XI for left and right circles!
The imaging position on the target of the electron image emitted from the photocathode corresponding to the X-ray image for input to the input photoelectric direction of the image pickup tube and the XIi image for right by alternating Xml radiation from the source is determined. When a deflection coil for deflection is installed and a left circular Xa image is input, beam blanking is performed on the scanning plane area where the left circular electron image is formed, and the right electron image that has already been input is Even when beam scanning is performed, the same image 11 is output, and when the right electron image is input, beam blanking is performed on the scanning surface area where the right electron image is formed, and the image that has already been input is This system is characterized by being equipped with one xm television camera that beam-scans an electronic image of the left circle and outputs a video signal of the left circle, and a controller that controls the camera.

[Embodiment of the Invention] An embodiment of the present invention will be described with reference to Eko.

In Fig. 1, numeral 1 indicates a single-target, bifocal type stereo Xa tube, which has two truncated cone-shaped rotating anodes (not shown) that serve as targets for X-ray conversion. A cathode (not shown) is placed at a distance necessary to cross the left and right images for stereoscopic vision, and by emitting thermionic electrons from the cathode, the cathode emits thermionic electrons to the left and right from the target collision point of the thermionic electrons. The structure is such that X-rays are emitted. 2
The XI! signal generated by the stereo XFLL tube is shown in the figure.
This is an X-ray flux limiting device that limits the X-ray flux so that it becomes a predetermined beam flux. Reference numeral 3 indicates a subject, such as a patient. 4 is the stereo xI! An image intensifier (I-1> 6 is the optical system, which consists of a primary lens placed in front of the output tendency surface of As shown in FIG. 2, the X-ray television camera uses an image pickup tube 17, and has a deflection coil 5 for deflecting an electron image in its input section. x111 for
By supplying the deflection coil 5 for electron image deflection with a deflection N current synchronized with the m-ray, when the input photocathode 13 receives the optical beam 11115 due to the left circle A left electron image FL is formed at the displaced position, and a right electron image XI! is formed on the input photocathode 16. When receiving the optical f&15, the right electron *FR is imaged on the scanning surface 14 at a position displaced to the right from the center thereof. In addition, XS for left and right
By blanking the scanning beam in the area on which the electron image is projected in the two sections, when the left electron image F is formed on the left side of the scanning surface 14, the previously imaged stone electric When the right electronic image FR is imaged on the right side of the scanning surface 14, the left electronic image FL is scanned to output a video signal for the left electronic image by scanning the right image R. In addition, the image memory device shown at 8 in FIG. A storage device 10 for storing the image of the Buddha statue C of the aircraft output from the device and the X-ray television camera 7;
For example, it has a configuration including an IC memory device.

Reference numeral 11 indicates a stereoscopic display device such as a stereoscopic television monitor, and the right display device 29 and the left display memory @Wani 10 output the right display device, and the left display device W110 outputs the right display device and the left display device W110. It is configured to stereoscopically display a visible light image of the subject 3 based on a video signal, and polarized light IIJ
Configuration 1' can be achieved by employing various known methods such as the No. 11 method or the lenticular plate method.

Reference numeral 12 indicates a controller, which includes an xIIA trigger signal that instructs the X-ray controller 13 to emit left-circular X-rays and XtlA@-irradiation from the stereo X-ray tube 1, and a deflection coil for electron image deflection. 5, a beam blanking signal synchronized with the X-ray trigger signal that instructs the X-ray television camera 7 to emit left circular and right X-rays, and the image memory device 8. It is configured to generate a recording trigger signal that instructs writing and to control the operation of each part.

Next, the operation of the three-dimensional X-ray radiation apparatus having the above configuration will be described.

When an X-ray trigger signal for operating the stereo X-ray tube 1 is input to the xi*controller 13 in synchronization with, for example, a 60 Hz vertical synchronization signal generated by the controller 12, the stereo X-ray tube 1 is activated for several milliseconds, for example. 1 with a width of
A tube current of 0 to 20 mA flows and is applied 30 times/s e alternately at different times from the left and right focal points of the stereo X-ray tube 1.
Pulsed X-rays with a width of am increments of am are emitted.

Therefore, the optical images of the subject 3 from the left and right X-ray sources are alternately displayed 30 times for 7 seconds on the output surface of the l-14.

This optical image is projected by the optical system 6 onto the input photocathode of the image pickup tube 17 of the television camera 7. Photoelectrons corresponding to the input optical image are emitted from the input photocathode, and the accelerating electrode 18. The image is focused and projected onto the scanning plane 14 (target plane) by the action of other electrodes and a focusing coil (not shown).

On the other hand, since deflection currents in opposite directions are alternately supplied to the deflection coil 5 in synchronization with the X-ray irradiation, the electrons from the photocathode 16 are alternately changed in opposite directions and are placed at different positions on the scanning plane 14. Focused projection.

Similarly, in synchronization with the X-ray trigger signal for the left circle and thigh, the beam scanning of the left half or the right half of the line scanning of that input surface is stopped.The remaining half of the input surface that is not beam blanked is beam scanned. , also roughly image memory device,
Video signals and signals are recorded in the left-circle and right-circle storage devices 10. That is, as shown in FIG. 3, when left-circular xsg radiation is performed, the resulting left-circular electron image incident on the scanning section of the image pickup tube is shifted to the left. The eccentric position is the deflection coil 5.
The center A of the deflected electron image is set to be located at a distance of about 2/3 of the radius of the undeflected electron image, although this can be appropriately determined by the deflection current supplied to the deflection current. When the left circular electron image is formed on the scanning plane of the image pickup tube, the left half of the scanning plane is beam blanked, and the first field beam is scanned only on the right half of the scanning plane. In this case, no stone image is projected on the right half of the scanning plane. Next, when right X-ray exposure is performed, the resulting right electron image incident on the scanning section of the image pickup tube is shifted to the right by the same distance. When the right electron image is formed on the scanning plane of the imaging tube, the right half of the scanning plane is beam blanked, and the second field beam scans only the left half of the scanning plane, and the previous left circular X-ray A video signal of the image is output from the X-ray television camera 7 and written into the left open storage device 10. Next, the stereoscopic television monitor 11 receives the video signals of the left-hand device and the right-hand device from the image processing device 8, and receives the video signals from the CR7
Display the left-hand machine on the screen. The above operations are repeated alternately for each field. At this time, both the left and right ends of the input phosphor screen (■) and (4) are shielded from X-rays, and the deflected images are made into an oval shape so that they do not overlap on the scanning plane, as shown in Figure 3. is preferred.

According to the embodiment, xI! 1/60 sec of detonation
In addition, the right-hand and left-hand cameras can be clearly separated by the image pickup tube, allowing for good stereoscopic vision.Furthermore, since only one X-ray television camera 7 is used, the amount of light can be reduced. It is possible to provide a low-cost stereoscopic X-ray television device with no loss and only one television camera is required for adjustment.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications within the scope of the gist of the invention. Needless to say.

In this invention, the above-mentioned embodiment apparatus includes a contrast agent injection device that is controlled by a controller and injects a 13 M image into a subject, and images for left and right circles after contrast agent injection outputted from an image memory device. The signal PE is subjected to high-speed A/D conversion, and digital image processing such as subtraction and image enhancement is performed using another pair of storage devices for the left and right video signals before contrast agent injection. It is also possible to add a digital processing device that outputs image data to a display device to form a stereoscopic X-ray television device 414 using digital radiography.

[Effects of the Invention] According to the present invention, compared to a stereoscopic X-ray television that uses two X-ray television cameras, there is no loss of light quantity, the configuration is simple, and therefore the cost is low, the size is small, and the adjustment is easy. It is possible to promote the purchase of 3D X-ray television equipment with good 3D entertainment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of a television camera, and FIG. 3 explains the operation of the embodiment. FIG. 1... Stereo X-ray tube, 2... X-ray flux control device,
3... Subject, 4... Image intent I1
15... Deflection coil for cathode ray tube photoelectric image deflection, 6... Optical system, 7... X-ray television camera, 8... Image memory device, 9... Right storage device, 10... ... left open storage device, 11 ... stereoscopic display device δ, 12 ... controller,
13...X-ray controller. Agent: Patent attorney Kensuke Norichika (and 1 other person) Funeral map 2

Claims (1)

[Claims] An X-ray image obtained by irradiating the subject with X-rays from left and right X-ray sources placed at a predetermined interval is converted into an optical image by an image intensifier, and this is converted into an optical image. In a three-dimensional X-ray television device that enables stereoscopic viewing of a subject's image by capturing an image with a X-ray television camera, an image-type image pickup tube is used as an image pickup tube, and X-ray radiation is alternately emitted from left and right X-ray sources. A deflection coil is installed to deflect the imaging position of the electron image emitted from the photocathode on the target in response to the left and right X-ray images input to the input photocathode of the image pickup tube. In addition, when the left X-ray image is input, the scanning surface area where the left electron image is formed is beam blanked, and the already input right electron image is beam-scanned to form the right X-ray image. Outputs the video signal,
When the right electron image is input, beam blanking is performed on the scanning surface area where the right electron image is formed, and the already input left electron image is beam-scanned to output a left video signal. A stereoscopic X-ray television apparatus characterized by comprising one X-ray television camera and a controller that controls the camera.