JPS59183736A - X-ray stereocine photographing 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 relates to an X-ray stereocine imaging apparatus capable of monitoring an X-ray fluoroscopic image during X-ray 1 stereo cine imaging.

[Technical background of the invention and its problems]

An example of an X-ray stereocine imaging device currently proposed is that during stereocine imaging, an optical image output from an image intensifier (hereinafter abbreviated as 1.I) is transmitted to a cine-stereo camera using a half mirror. In addition to being distributed to the TV camera, the video signal output from the TV camera is output to the TV monitor, thereby displaying a perspective image on the screen of the TV monitor.

However, although it is possible to display a single fluoroscopy image on a monitor in real time during stereocine shooting,
As shown in FIG. 1, left image 2 and left image 3 are displayed on monitor 1.
are displayed at a speed of several tens of frames per second, so
From the observer's perspective, the left image 2 and the left image 3 appear to overlap, which reduces the usefulness of the image as a perspective monitor image.

[Purpose of the invention]

This invention was made in view of the above circumstances, and has a simple configuration that allows clinically effective fluoroscopic monitor images to be produced in real time during stereocine imaging without adding any complicated mechanisms or units. It is an object of the present invention to provide an X-ray neurocine imaging device that can be obtained.

[Summary of the invention]

The outline of the present invention for achieving the above object is as follows: A stereo X-ray tube capable of emitting X-rays from two focal points; an image intensifier that converts the image into an image; a cine camera that alternately captures an optical image for pressure and an optical image of Ishikawa on a cine film; and a video signal of at least one of the optical image for pressure and the optical image of Ishikawa in real time. A television camera that converts the optical image into a cine camera, and a digital camera that distributes all optical images to the television camera and cine camera.
an optical system in which an electronic shutter is arranged in front of an input surface of the television camera to reduce input light from either the optical image or the optical image of Ishikawa; and a television monitor that displays an image by inputting the video signal; Equipped with
The present invention is characterized in that it is possible to monitor either of the left and right optical units during stereocine photography.

[Embodiments of the invention]

An embodiment of the invention will be described with reference to the drawings.

In Fig. 2, numeral 4 indicates a stereo X-ray tube that is equipped with two focal points on one anode at a predetermined focal spacing, for example, 63vans, and between the left and right cathodes and the anode. By alternately applying a bias voltage to a pair of left and right grids (not shown) provided, pulsed X-rays can be alternately irradiated from the left and right focal points by, for example, high-speed switching of 100 times or more. . 5 indicates, for example, 50KV ~ 100 rounds per second or more.
1501 (This is a high voltage generator that generates high voltage pulses of V and applies the high voltage pulses to the stereo X-ray tube 4. Reference numeral 6'V is an X-ray controller that generates high voltage pulses of A stereo cine pulse control signal for generating high voltage pulses at a predetermined timing in the voltage generator 5 is output to the high voltage generator 5, and a bias voltage to the pair of left and right grids of the stereo X-ray tube 4 is applied. , outputs a synchronization signal to be applied in synchronization with the stereo cine pulse control signal to the stereo X-ray tube 4, and also outputs an electronic shutter 13 to be described later.
An on/off signal for opening and closing the electronic shutter in synchronization with the X-ray exposure is outputted to the electronic shutter 3, and furthermore, the film advance of the cine camera 11 and the opening/closing of the shutter (not shown) of the cine camera 11, which will be described later, are controlled by the Rtl X-ray exposure. Synchronize with C@
The camera is configured to output a cine camera synchronization signal and other synchronization signals. 7 indicates 1. This is a bed placed between the I9 and the stereo X-ray tube 4 on which the subject 8 is placed. 1. I9 is a device known per se that is disposed opposite to the stereo X-ray tube 4 and converts an X-ray transmission image transmitted through the subject 8 into an optical image (eg, a fluorescent image) and outputs the same. 10 is the optical system, half-mirror IO
A and an electronic shutter 13; 1. The fluorescent image outputted from the I9 is distributed to the cine camera 11 and the TV camera 12 by the half mirror 10A at a ratio of, for example, 9:1. The electronic shack 13 is a shutter that does not have any mechanical operation; for example, as shown in FIG. A light shielding element having an electrode to which a DC voltage of several hundred V is applied, such as PLZT (Pead Lanthanum Z
irconate Titanate) element 17;
A pair of polarizing plates 15 and 16 are arranged on the light incident surface 0I11 and the light exit surface side of the PLZT element 17 and have polarization angles different from each other by 900, and when no voltage is applied to the electrodes, Since the light that has passed through the polarizing plate 15 passes through the PLZT element 17 as it is without the polarization angle being rotated, the light is blocked by the polarizing plate 16 (that is, the amount of light is reduced to infinity by the polarizing plate 16). When a voltage is applied to the electrodes, the light passes through the polarizing plate 15, and when passing through the P L Z T element 17, the polarization angle is rotated by 90 degrees and the light is emitted from the P L Z T element 17. The polarized output light is configured to pass through the polarizing plate 16 as it is. If the application of DC voltage to the electrodes provided in the P L Z T element 17 is turned on and off within, for example, 50 microseconds, the contrast ratio (
The ratio of transmittance between on and off times is 1,000:1 or more, and the maximum transmittance can be about 30% (when on). The pulse X-ray exposure interval is usually 90 shots/second to 120 shots/second.
The maximum number of shots per second is 180 shots per second, and the period at that time is 675 seconds, so the response speed of the electronic shutter 13 can sufficiently respond. Also, the ratio of transmittance and reflectance of No.Fumira 10A is 1=
If it is 9, the amount of light incident on the TV monitor 12 can be made sufficient to convert into a video signal, and when shooting cine, it can be set as ND (Natural Density).
) Since the light is attenuated by using a filter or a diaphragm, the light transmittance of the PLZT element of 30% (when on) is a convenient condition for incorporating it into a system. Furthermore, since the light transmittance can be varied by changing the voltage applied to the PLZT element, it is possible to change the transmittance according to the number of cine shots, so that an image with optimal brightness can be obtained on the TV monitor. Specifically, for example, when the number of cine shooting frames is 60 frames/second, the transmittance is 30%.
In this case, when shooting at 90 frames per second, the transmittance should be set to 2.
By setting it to 0+%, the amount of light per unit time that enters the television camera is constant regardless of the number of frames taken, and the brightness on the monitor can always be obtained at the same level. The cine camera 1.1 has a film advance mechanism that synchronizes with Nomilus X-ray exposure and advances the film at, for example, 90 frames per second to 120 frames per second. It is configured so that it can be photographed alternately on different films. The TV right camera 2 captures either the pressure or useful fluorescence image by blocking either the pressure or useful fluorescence image distributed by the half-mirror IOA with an electronic shutter 13, and outputs a video signal. For example, it is a camera having an image pickup tube such as a vidicon or a carnicon, and the output video signal is displayed as one image of visible light on the television monitor 14.

Next, the operation of the X-ray steno-oscine imaging apparatus having the above configuration will be explained.

As shown in FIG. 4, from the cine camera 11 to the X-ray controller 6
Each time the film in the cine camera 11 is advanced one frame, a signal synchronized with the opening and closing of the shutter is output, and when the shutter in the cine camera 11 is released, the synchronization signal becomes a no level, and the shutter in the cine camera 11 is closed. It becomes low level when . Further, the X-ray controller 6 outputs a stereo cine pulse control signal to the high pressure generator 5 in synchronization with the cine camera synchronization signal, and also outputs a stereo cine pulse control signal to the stereo X-ray tube 4.
By outputting a synchronization signal to the X-ray tube, pulsed X-rays are emitted alternately from the left and right X-ray tube focal points. In addition, since the cine camera 11 synchronizes the frame-by-frame advance of the film and the exposure of pulsed X-rays, a pressure fluorescent image and a useful fluorescent image are alternately photographed in each frame of the cine film 18. It turns out.

On the other hand, as shown in FIG. When X-rays are being emitted from the focal point, the electronic shutter 13 is in an open state (light transmitting state) by a high-level on/off signal, and X-rays are being emitted from the right focal point of the X-ray tube 4. Sometimes, a low-level on/off signal causes the electronic shutter 13 to be in a closed state (light blocking state).
Only the fluorescent image for pressure is input to the input surface of the TV right camera 2 and is captured. Note that the electronic shutter 13 is generally opened and closed in accordance with 1. Since there is an afterimage after X-ray exposure on the fluorescent surface of I9, the timing at which the electronic shutter 13 ends in the open state is delayed from the end of the X-ray exposure from the left focal point of the X-ray tube 4, and It is preferable that the timing at which the electronic shutter J3 starts to be released is sufficiently delayed from the end of the Xi exposure from the right focal point of the X-ray tube 4.

The pressure fluorescent image captured by the TV left camera 2 is displayed on the TV monitor 14. In this case, stereo cine shooting is
The image processing speed is 90 frames per second to 120 frames per second, so even if only the fluorescent image for pressure is taken into the image pickup tube, the image is sent at half that speed, that is, 45 frames per second to 60 frames per second. Due to the afterimage effect of the tube, the fluorescent surface of the television monitor, and the human eye, flicker-free images can be displayed continuously on the television monitor 141/C in real time. Although the image displayed on the television monitor 14 is a flat image even though stereocine photography is in progress, it is sufficient for the purpose of real-time observation.

Although one embodiment of this invention has been described in detail above, this invention is not limited to the above embodiment, and it goes without saying that it can be implemented with appropriate modifications within the scope of the gist of this invention. Nor.

〔Effect of the invention〕

According to this invention, since the electronic shutter blocks the fluorescent image input to the TV camera, the timing of X-ray exposure can be reliably and easily synchronized, and the electronic shutter body is small and compact. An electronic shutter can be implemented without adding bulky mechanical mechanisms inside the optical system and without changing the scale of the conventional optical system. And while performing stereo cine photography with an extremely rich amount of information, it is possible to observe a clear monitor image in real time. Therefore, the X-ray stereocine imaging apparatus according to the present invention is extremely useful for stereocine imaging.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a fluoroscopic monitor image in a conventionally proposed stereocine photographing device, FIG. 2 is an explanatory diagram showing an embodiment 1 of the present invention, and FIG. 3 is an explanatory diagram showing an electronic shutter in the above embodiment. and FIG. 4 are time charts for explaining the operation in the embodiment. 4... Stereo X-ray tube, 9... Image intensifier, 10... Optical system, IOA・
...Half Mira, 11...Cine camera, ]2
...TV camera, 13-Electronic shutter, 14
...TV monitor.

Claims (1)

[Claims] A stereo X-ray tube capable of emitting X-rays from two focal points, an image intensifier installed facing the stereo X-ray tube and converting the X-ray array into an optical image, and a stereo X-ray tube capable of emitting X-rays from two focal points; a cine camera that alternately photographs an optical image of the pressure sensor and the Ishikawa optical image, a television camera that converts at least one of the pressure sensor and the Ishikawa optical image into a video signal in real time; Ishikawa's optical system includes a half mirror that distributes the optical system to the television camera and the cine camera, and an electronic shutter that reduces the amount of input light to either the optical image or the Ishikawa's optical image and is arranged in front of the input surface of the television camera. ,
An X-ray stereocine imaging apparatus, comprising a television monitor that displays an image by inputting the video signal, and is capable of monitoring either the left or right optical image during stereocine imaging.