JPH0470014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is used in the field of X-ray television equipment.

The present invention relates to an X-ray continuous stereoscopic imaging apparatus that captures or records X-ray transmitted images of a subject's body part and observes them as continuous stereoscopic images on a TV monitor.

(b) Conventional technology In the past, two photographs or two recorded images of a subject's part transmitted through X-ray radiation from two focal points separated by a certain distance were captured with both eyes and observed as stereo images. There is. However, this can only be observed as a static stereo image.

(c) Purpose An object of the present invention is to enable continuous stereo images to be observed using an image receiving device and one or two displays that rotate and move around a subject part. The present invention provides an X-ray continuous stereoscopic imaging observation device.

(d) Configuration The above-mentioned purpose is to provide an image receiving device that rotates continuously in one direction centering on the subject, and an A ray tube intermittently irradiates X-rays at a timing based on a vertical synchronization signal of a TV image signal, and alternately distributes X-ray transmission images at a plurality of equally spaced positions on a rotating orbit that corresponds to the timing of the image receiving device. at least two recording devices for recording;
This is achieved by comprising display means for reading out recorded images at equally spaced positions adjacent to each other in the direction of the rotational trajectory from each recording device and sequentially changing the combination at the timing and displaying them side by side on a TV display screen. These two displayed images are observed as a three-dimensional image using known stereo glasses.

It is common practice to record and save the transmitted image of the subject's body part on a continuous recording device such as a VTR, and then play it back, perform signal processing, and observe the stereo image. figure,
Process the output of the TV camera control device as is,
Stereo images can also be observed immediately.

(E) Embodiments Preferred embodiments of the present invention will be explained based on the drawings.

Figure 1 is a schematic block diagram showing the whole, Figure 2 is
A summary block diagram mainly showing the signal processing starting from the VTR, and FIG. 3 are time charts of various signals, both of which show the mode of using the video that is once continuously recorded on the VTR and then played back.

In the figure, 12 is an X-ray tube, 14 is a subject,
16 is an image intensifier (...),
18 is a TV camera, 20 is a TV camera controller, 2
2 is a VTR, 24 is a counter, 26 is a set circuit,
28 and 30 are flip-flops, 32 is a temporary recording device, which has a digital memory, an A/D converter at the front stage, and a D/A converter at the rear stage,
34 is a TV monitor, and 36 is a stereo controller. Note that the X-ray tube device 12 and the image receiving device (...
A substantially C-shaped holding device that connects and holds the TV camera 16 and the TV camera 18) is not shown. Moreover, the arcuate line having an arrowhead illustrates the rotation trajectory of the holding device, and A, B, C, D, and E indicate equally spaced position points thereof.

In FIG. 2, the video signal a recorded on the VTR 22 is first simultaneously sent to a recording device 32 for temporary recording. At the same time, the vertical synchronization signal (VD) b extracted from the recorded video signal is sent to the count circuit 24, where it is counted down from the initial value or countdown rate preset by the set circuit 26,
A count down signal c is output in synchronization with the zero count. Furthermore, this vertical synchronization countdown signal c is alternately distributed by the flip-flop circuit 28, and a recording start signal d or e is sent to the recording device 32 or 32, respectively. Recording start signal d
The recording device 32 or 32 that receives the signal e immediately erases the currently recorded image and records a new video signal a for one frame at the same time. Immediately after recording one frame, it is read out and the video signal is sent to the TV monitor 34 and the TV monitor 34. Note that during this one frame recording period, the same video signal is simultaneously sent directly to the TV monitor 34 to eliminate interruptions in the video during the recording operation period.

When two TV monitors 34 are arranged horizontally and observed continuously, if the moving direction of the image is set to one direction, either from the left or from the right, the images of the two TV monitors 34 will be displayed every other time. If the images are not replaced, the moving directions of the images will not match. Therefore, as shown in the time chart of Figure 3, one of the stereo images
The episode begins with the start of recording on one of the recording devices 32,
Since the recording ends with the start of the other recording, a flip-flop circuit 30 is provided which generates a signal that continues during this period, and the output h or the flip-flop circuit 30 is used to control the monitor changeover switch. In addition, in Figure 3, i is the number of two
An image appearing on a TV monitor 34 is shown.

Here, let us consider a set value for counting down using the vertical synchronizing signal (VD) and outputting a countdown signal. In general, X-ray photography provides two images with good stereo vision, and the distance between the two X-ray irradiations is said to be approximately 63 millimeters. In the present invention, since TV images are observed,
Considering the operation of a TV as a standard, and assuming that the interval between two images illustrated in Figure 3 is 2 frames, or 1/15 second, which corresponds to approximately 63 mm on the rotational orbit, the rotation speed is found to be 63 (mm). /1/15 (second) = 945 milliseconds.

Similarly, a countdown signal for determining the position of two images may be generated every 4 frames at a rotation speed of 473 mm/sec and every 8 frames at a rotation speed of 236 mm/sec. In this way, the countdown rate from the vertical synchronization signal (VD) is determined in accordance with the rotation speed.

Note that the X-ray irradiation interval is not limited to 63 mm as explained above, but can be set arbitrarily, for example, depending on the magnification ratio of close-up stereoscopic imaging and enlarged stereoscopic imaging.
It should be set in the range of 10 to 100 mm. Further, in this case, the rotation speed is set based on the relationship between the set X-ray exposure interval and the two-image interval.

In addition, in the embodiment, two TV monitors were arranged horizontally as display devices, and the images recorded by the recording device were displayed separately. It may be divided into two parts, and the recorded images of each recording device may be displayed at corresponding positions on the display surface.

(f) Effects The present invention has the effect that a continuous stereo image rotating and moving around the subject can be observed.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of the overall configuration showing one embodiment of the present invention, FIG. 2 is a signal processing block diagram showing the gist thereof, and FIG. 3 is a time chart thereof. 18 is a TV camera, 20 is a TV camera controller,
22 is a VTR, 24, 26 and 28 are timing generators, 32 is a temporary recording device, 34 is a TV monitor,
30 and 36 are stereo controllers.

Claims (1)

[Claims] 1. An image receiving device that rotates continuously in one direction around the subject, and an X-rays are emitted intermittently at a timing based on a vertical synchronization signal of the signal, and at a plurality of equally spaced positions (A, B, C, D, E, ...) on a rotating orbit that match the timing of the image receiving device. At least two recording devices that alternately distribute and record transmitted images (one is A, C, E, ..., the other is B,
D, F, .
1. An X-ray continuous three-dimensional imaging and observation device, characterized in that it is equipped with display means for displaying (ED, EF, ...) readout TV display screen side by side.