JPS60185481A - X-ray equipment - Google Patents

Abstract

PURPOSE:To decrease an X-ray exposure dose without excerting adverse effect on the diagnosis by displaying an X-ray fluoroscopic picture continuously on a television monitor just before the intermission through the use of a video reproducing device even if the X-ray exposure for fluoroscopy is intermittent. CONSTITUTION:The fluoroscopic X-ray is exposed by a foot switch 4 as an operation switch and the exposure of X-ray is started via a foot switch input circuit 7, an X-ray exposure control circuit 5, and an X-ray controller 2. When the X- ray is exposed, a TV camera output video signal outputted from a TV camera controller 3 is reproduced by a TV monitor 17. In turning off the foot switch, an output video signal from a video recording amplifier circuit 12 is fed to a VSR14 via a gate circuit 13 and the VSR video recording is applied to one frame picture. Then an output of a trigger circuit 10 is fed to a switch circuit 15 at the same time and the switch is switched to a reproduction amplifier circuit 16. Further, a counter circuit 9 is controlled by a timer circuit 8 and the X- ray exposure is finished by a signal in synchronizing with a VD signal via the X-ray exposure control circuit 5. The picture for the said one frame's share is displayed on the TV monitor 17 continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diagnostic X-ray apparatus that performs X-ray fluoroscopy for a long time using an X-ray television.

Recently, X-ray televisions have been widely used in diagnostic X-ray apparatuses because X-ray fluoroscopic images of a subject can be observed on a television monitor in real time and remotely.

However, although the X-ray exposure during X-ray fluoroscopy is much lower than that during X-ray photography, because the fluoroscopy time is short, the X-ray exposure dose received by the patient is lower than that during X-ray photography. This has become a major problem in today's world, where there is a need to reduce the number of radiation doses that patients are exposed to.

For diagnosis, it is not necessary to observe the X-ray fluoroscopic image throughout the diagnostic procedure, and it is only at a certain time during the diagnostic procedure that the X-ray fluoroscopic image is truly required. Therefore, from the viewpoint of exposure dose, it is sufficient to use a switch or the like as appropriate to obtain a fluoroscopic X-ray image for the required time. Therefore, in the case of X-ray television for orthopedic surgery, where the subject of examination is a motionless part such as the bones of a limb, X-ray fluoroscopy is used primarily for the purpose of X-ray imaging rather than X-ray removal. Therefore, as mentioned above, the X-ray fluoroscopic image is taken only as needed using the switch, etc.
There is a strong tendency to move to the right in reducing the dose of the patient.

However, when measures are taken to reduce radiation exposure as described above, the X-ray fluoroscopic image is cut off in the middle, making it difficult to compare with the previous X-ray fluoroscopic image, or to recognize changes in the condition. Therefore, in reality, in many cases, X-rays are continuously irradiated throughout the diagnostic procedure.

This invention was made based on the above circumstances, and
Even if fluoroscopic X-ray exposure is interrupted using a recording device, the X-ray fluoroscopic image immediately before the interruption is continuously displayed on a television monitor until the next X-ray fluoroscopic image is obtained,
An object of the present invention is to provide an X-ray apparatus for diagnosis using an X-ray television, which can reduce X-ray exposure of a subject during X-ray examination without adversely affecting diagnostic techniques.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an X-ray apparatus according to an embodiment of the present invention. In the figure, 1 is an X-ray television device for external use in this case, 2 is an X-ray controller installed in the X-ray television device 1, and 3 is an X-ray television device M.
1 is equipped with a TV camera controller, 4 is a 7-way switch as an operation switch, 5 is an XwA exposure control circuit that provides a control output to the X-ray controller 2 to control X-rays @ copper, 6 7 is a synchronization separation circuit that receives the video signal from the TV camera controller 3 and separates and takes out the vertical sync signal in this case, and 7 is a switch input to foot 1 that generates a signal in response to the on/off operation of the foot switch 4. circuit, 8 is based on the signal from the switch input circuit 7
9 is a counter circuit that outputs a recording command signal and a command signal to stop shooting X[J] in synchronization with the synchronization signal of the synchronization separation circuit 6 based on the output of the timer circuit 8; 10 is a non-counter circuit; 1 is a trigger circuit which applies recording commands 1 to riggers to the VSR main body (to be described later) in response to the recording command signal 9; 11 is a VSR main body; 12 is a recording amplification circuit that amplifies the video signal from the TV camera controller 3; Trigger circuit 1
14 is a gate circuit that controls the output of the recording amplifier circuit 12 according to the recording command 1 from 0, and 14 is a gate circuit that records the video signal given through the gate circuit 13. The VSR 115 is used during playback and when it is outside the gate circuit 14. A switch circuit for switching the video signal, 16 a regeneration amplifier circuit for amplifying the reproduction signal from the VSR, and 17 a reproduction amplifier circuit 16 for a video signal from the TV camera controller 3 or the reproduction amplifier circuit 16 according to the switching of the switch circuit 15.
This is a TV monitor that displays the VSR playback video signal from the TV.

Next, referring to FIG. 2, a detailed explanation will be given of the operation of the configuration of the embodiment described in -F.

That is, in this embodiment, as shown in FIG. 2 e and the TV camera output video signal, as shown in FIG. A video signal corresponding to one frame (for example, one frame) of an X-ray image, for example, Uranori and M (A-Q do not indicate scanning fields) in the figure f, is recorded on, for example, a VSR, and it is used for the next X-ray image. The image continues to be reproduced until continuous fluoroscopy by exposure is performed, and normal continuous fluoroscopic images can be obtained on the TV monitor during continuous fluoroscopy. Note that the TV camera operates in a normal blanking operation.

Exposure of the fluoroscopic X-rays is performed by a seven-point switch 4 as an operation switch, whereby a rising pulse signal (J: U) shown in FIG. 2A is outputted from the foot switch input circuit 7. This output signal J is input to the X-ray exposure control circuit 6, which generates a pulse for turning on the X-ray @Q4 as shown in Fig. 2, and output to the X-ray controller 2, as shown in Fig. 2 e. X-ray exposure is started as shown in FIG. In this case, the time Too for which the foot switch 4 is turned on determines the time for almost continuous fluoroscopy, but more precisely, the time TO will be described later.
2 and the time (TOO+T o2>) becomes 6 - at the time of X-ray irradiation. When X-rays are irradiated, the TV camera output video signal 13 output from the TV camera controller 3 is as shown in FIG. f, one side is outputted to the synchronization separation circuit 6, and the other side is outputted to the recording amplifier circuit 12 and the switch circuit 15. At this time, since the switch circuit 15 is connected to the state shown in FIG. As shown in the second diagram, it is reproduced on the TV monitor 17 and continuous fluoroscopy is performed.
The 1J circuit 6 separates and extracts the vertical synchronization signal (Vl signal) from the video signal from the TV camera controller 3.
Output to the counter circuit 9.

Next, when the humil switch 4 is turned over by A, this signal is inputted to the counter circuit 9 via the watt switch input circuit 7 and the timer circuit 8, and a signal synchronized with the VD signal is generated based on this off-off period. - Output to the trigger circuit 10. Then, as shown in FIG. 2d, a vSR recording command synchronized with the VD signal is generated after a time Tol, and the circuit 1 is sent to the goo 1.
3 to the VSR 14. Accordingly, the output picture amplification signal from the recording amplification circuit 12 is supplied to the VSR via the G1 circuit 13, and VSR recording of one frame image is performed as shown in Fig. 2g. I can sleep. At the same time, the output of the trigger circuit 10 is also supplied to the switch circuit 15, which switches the switch to the regenerative amplifier circuit 16 side. In addition, after the time To2 that does not interfere with VSR playback after the end of recording has elapsed, the timer circuit 8
The counter circuit 9 is controlled, and the actual X-ray treatment is terminated via the X-ray exposure control circuit 5 using a signal synchronized with the VD signal. This state is shown in FIG. 2e, where the time Tol,
TO2 can be adjusted as necessary.

As a result, the TV monitor input signal, that is, the VSR playback signal (
(including continuous perspective video signal) is as shown in the second diagram, ■5R
One frame worth of images recorded in 14 are read out continuously, and displayed on a TV monitor 17 via a reproduction amplification circuit 16 and a switch circuit 15. This is the next X-ray @
The image on the TV monitor V is kept uninterrupted until continuous fluoroscopy is performed again by the previous i[! When Xtm exposure is input from the switch 1 to the switch 4, the switch circuit 15 is switched to the TV camera controller 3 side, and inputs the imaging signal from the TV camera controller 3).
It works smoothly.

According to this invention, when performing XI fluoroscopic diagnosis using an X-ray television, the foot switch etc. can be used to stop the X-ray emission during unnecessary times, and only take the necessary X-rays. Even if you perform X-ray fluoroscopy by performing ＠謬, the previous xIiIi visual image is displayed for each time, so the recognition of changes in the state of the X-ray fluoroscopy area will not be impaired, and the image will not be interrupted. Because it does not cause discomfort,
X-ray H can be shut off carefully using a no-1 switch or the like, and as a result, the radiation dose to the subject can be greatly reduced.

Note that the present invention is not limited to the embodiment described in -F. For example, a recording/playback device such as a video disc recorder may be used in place of the VSR in the above embodiment. It goes without saying that the present invention can be applied to any type of X-ray fluoroscopy using an X9-ray television, regardless of whether the specimen is moving or not, or whether it is fast or slow, and can be implemented as appropriate without changing the gist of the invention.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a time chart for explaining the operation of the configuration of FIG. 1. DESCRIPTION OF SYMBOLS 1... X-ray television device, 2... X-ray controller 4... Switch to [fu], 5... X-ray II radiation control circuit 6... Synchronization separation circuit, 8... Timer Circuit 9・
...Counter circuit, 14...VSR (recorder to video sea 1) 17...TV monitor representative patent attorney 111 Kensuke Chika (1 person) 10-

Claims (1)

[Claims] Exposing XvA to the subject T 8 X-ray generator and this
Television field's video A transmission of the xm image of the line passing through the subject! 4; a recording device that records a video signal supplied from the imaging device; and a video signal supplied from the imaging device or a video signal read from the recording device, displayed in a television field. - an X-ray apparatus equipped with a display device,
Arbitrary timing of X-ray@irradiation and [111 time 1Vi
an X-ray control device that controls X-ray exposure in synchronization with the television field according to the timing and exposure time of this operation switch; The recording command signal is output when the scheduled time has elapsed after the operation switch is turned on.
An X-ray apparatus comprising: a time limit means for outputting a radiation exposure stop signal, and a prerecording nlj device is controlled in accordance with a recording command signal from the time limit means.