JPS60195897A - X-ray control device - Google Patents

Abstract

PURPOSE:To prevent an X-ray tube from being broken by detecting that the selection signal of the X-ray tube coincides with one of a lighting confirmation signal, and anode rotation confirmation signal, or the transfer confirmation signal of a high-voltage transfer unit to close a radiation switch for each X-ray tube. CONSTITUTION:Coincidence circuits 27a, 27b are provided for each of X-ray tubes 1a, 1b to detect that the selection signal S1 of the X-ray tube allowing the X-ray radiation coincides with one of the lighting confirmation signal S3 of the X-ray tube filament, the anode rotation confirmation signal S4, or the transfer confirmation signal S2 of a high-voltage transfer unit, and an X-ray radiation switch 2 is closed by the coincidence signal S5 from the coincidence circuit 27a or 27b only when two or more of these signals coincide. If erroneous actions, open-circuit, etc. occur in each circuit of an X-ray control device, individual signals in the coincidence circuits 27a, 27b do not coincide, and no coincidence signal S5 is sent from the coincidence circuits 27a, 26b. Accordingly, the X-ray tube can be interlocked from being applied with the high voltage and can be prevented from being broken.

Description

[Detailed Description of the Invention] Field of Application of the Invention The present invention relates to an X-ray control device that controls X-ray irradiation from an X-ray tube, and particularly relates to an X-ray control device that controls X-ray irradiation from an X-ray tube. The present invention relates to an X-ray control device that can perform X-ray irradiation by reliably checking certain things.

Prior Art and Problems The conventional X-ray control device, as shown in Fig.
ray tubes la and 1b, an XIIj irradiation switch 2 that controls X-ray irradiation from these X-ray tubes 1a and 1b, and the X-ray tube 1
a filament heating transformer 4 for lighting the filaments 3a, 3b of the X-ray tubes la, lb; and anodes 5 of the X-ray tubes la, lb;
anode drive circuits 6a and 13b that rotate a and 5b;
High voltage switch 7a = 8a 9a, 10a; γb, Bb, 9b for switching high voltage application to the anodes 5a, 5b
, l Ql) and an X-ray tube 1a or Vi for irradiating X-rays.
A selector switch 11a selects 1b.

11b. Here, in FIG. 1, reference numerals 12 and 12' denote AC power supplies, 13 denotes an AC constant voltage power supply, 14 denotes a main transformer, 15 denotes a high-voltage rectifier, 16 denotes a filament lighting detector, and 17 denotes a high-voltage rectifier. 18 is a tube current selection resistor, and 18 is an irradiation control circuit.

In such an X-ray control device, for example, in order to irradiate X-rays from the first X-ray tube 1a, the first changeover switch 11a is turned on. Then, the excitation coil 7a of the high voltage switching device on the first X-ray tube 1a side is excited, and the filament 3a
The contacts 8a and 9a of the anode 5a are turned ON, and the contact IQa'1 of the anode 5a is turned ON. As described above, when the contacts 8a and 9a on the secondary side of the filament heating transformer 4 are closed, a current flows to the primary side, and the filament lighting detector 16 detects this current flow, and the irradiation control circuit At 18, the filament 3a of the first X-ray tube 1a sends out a signal that is not disconnected or not lit. Meanwhile, at the same time, the anode drive circuit 6a that rotates the anode 5a of the first X-ray tube 1a also operates, and sends a signal indicating that the anode drive circuit 6a is operating to the irradiation control circuit 18. When the above two signals are input, this irradiation control circuit 18 determines from K that the filament 3a of the first X-ray tube 1a is not disconnected or unlit, and that the first anode 5a is also rotating normally. Then, the X-ray irradiation switch 2 is closed by the operation of the irradiation control circuit 18. From this K, a high voltage of the anode SaK is applied from the high voltage rectifier 15 via the contact 10a, and X-rays are irradiated.

Here, as shown in FIG. 2, in the irradiation control circuit 18, the filament 3a that detects whether the filament 3a is not disconnected or not lit is the filament which detects only the presence or absence of the primary current of the filament heating transformer 4. This is done by closing the contact 20 attracted by the excitation coil 19 of the lighting detector 16. Furthermore, the rotation of the anode 5a is detected when the contact 24 attracted by the excitation coil 23 that detects the current of the main coil 21 and auxiliary coil 22 for rotating the anode of the anode drive circuit 6a closes. It's only by K. Therefore, when the contacts 20 and 24 are closed, the excitation coil 25 is excited and the X-ray irradiation switch 2
It will be closed. In addition, in FIG. 2, the reference numeral 26
is a contact point that controls the shooting time.

However, in the above conventional example, the filament heating transformer 4
Merely detecting that the primary current is flowing does not mean that the filament of the first X-ray tube 1a that should really be irradiated with X-rays)3
It was not possible to accurately check that a was not disconnected or unlit. In addition, just by detecting that current is flowing through the main coil 21 and auxiliary coil 22 of the anode drive circuit 6a, it is necessary to accurately check whether the anode 5a of the first X-ray tube 1a is actually rotating. I couldn't. Furthermore, a first changeover switch 11a shown in FIG.
It was also not possible to accurately check whether the high-pressure switching devices γa, 8a, 9a, and 10a on the first X-ray tube 1a side would necessarily operate if the switch was set to t-ON. Therefore, even if the switching of filament lighting, switching of anode rotation, and switching of high voltage application do not match, in reality, as is clear from FIG. The X-ray irradiation switch 2 may be closed by sending out a common normal signal, and high voltage may be applied to an X-ray tube to which high voltage should not be applied, causing the X-ray tube to be destroyed. .

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and it reliably checks that the X-ray tube has been selected to emit X-rays, and also checks whether the filament is lit or not. It is an object of the present invention to provide an X-ray control device that can reliably check anode rotation and perform X-ray irradiation.

#1 The main point of the invention and the above object is that according to the present invention, a plurality of X-ray tubes,
an X-ray irradiation switch that controls X-ray irradiation from these X-ray tubes; a filament heating transformer for the X-ray tube;
In the X-ray control device, the above-mentioned An X-ray tube selection signal that causes each X-ray tube to irradiate one X-ray, and an X-ray tube filament lighting confirmation E
(A matching circuit is provided to detect a match with either the No. i or anode rotation confirmation signal or the high voltage switch off ( ) confirmation signal, and the matching signal button from this matching circuit is used to open/close the Xm irradiation. This is achieved by providing an X-ray control device characterized in that the device is pressurized to close the device.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the X-ray control device according to the present invention includes a plurality of X-ray tubes ja, jb, an X-ray irradiation switch 2 for controlling X-ray irradiation from these X-ray tubes 1at1b, and the above-mentioned A filament heating transformer 4 that lights up the filaments 3a and 3b of the X-ray tubes la and 1b, and an anode drive circuit 6at6b that rotates the anodes 5a and 5b of the X-ray tubes 1a and 1b.
and high voltage switching devices γa, 8a, 9a, 10a; γb, 8b, 9b for switching high voltage application to the anodes 5a, 5b.
iOb, selector switches 11a and 11b for selecting the X-ray tubes 1a and 1b for X-ray irradiation, and switches 11a and 11b provided for each of the plurality of X-ray tubes 1a and 1b to detect the operating state of the X-ray tubes 1a and 1b. The matching circuits 27a and 27b are provided, and the matching signals from the matching circuits 27a and 27b are input to the irradiation control circuit 18'.

In FIG. 3, reference numerals 12 and 12' are AC power inputs, 13 is an AC constant voltage power supply, 14 is a main transformer, 15 is a high voltage rectifier, and 1T is a tube current selection resistor.

The coincidence circuits 27a and 27b detect the actual operating state of the XM tube 1a or 1b and send out a coincidence signal, and as shown in FIG. 29, a switching operation completion detector 30 of the high voltage switch, a tube selection detection contact 31, an AND gate 32 to which the signals of these detectors are input in parallel, and a coil 3 excited by the output of this AND gate 32.
3. The anode rotation detector 28 has, for example, a microphone 34 as a sensor, and when this microphone 34 detects the actual rotation sound of the lli pole 5a, the signal current is input to the anode rotation detector 28, and the anode rotation An anode rotation confirmation signal S4 is sent from the detector 28 to the AND gate 32. In addition, the sensor bar microphone oho mentioned above:
The light emission is not limited to y34, and may be strobe light emission. The filament lighting detector 29 has, for example, a photodiode 35 as a sensor.
5 detects light due to the actual lighting of the filament 3a, the signal current is input to the filament lighting detector 29, and from the filament lighting detector 29 to the AND gate 32.
A lighting confirmation signal SS is sent to. The switching operation completion detector 30 is, for example, a microswitch that sends a switching confirmation signal S2 to the AND gate 32 when the contact 10a of the high voltage switch for the first X-ray 't1a@ is properly closed.
As shown in FIG. 5, the excitation coil Ta of the high voltage switch
is excited and the iron core 36 is attracted as shown by arrow A (C), and when the movable contact 10a closes toward the fixed contact 10a' as shown by arrow A, the arm 37 connected to the movable contact 10a also moves as shown by arrow B. and turn the micro switch 30 to O.
It is now possible to do NK. Note that the switching operation completion detector 30 is not limited to a microswitch, and may be other types. The tube selection detection contact 31 is connected to the X-ray tube 1a.
The selector switch 11a is turned on to select the X-ray tube 1a, and at the same time closed, the selection signal S1 is sent to the AND gate 32.
Send out. Each of the above signals 31. S2, 3s
IS4 is input to the input terminal of the AND gate 32, and when 1'' is input to all input terminals, a coincidence signal S5 is output from the output terminal, and the excitation coil 33 is excited by this coincidence signal 35.

That is, for example, if the first X-ray tube 1a is correctly selected (
Input of selection signal S1), contact 10a of the high voltage switch is closed correctly (input of switching confirmation signal S2, filament) 3a
actually lights up (input of lighting confirmation signal S3), and the anode 5a actually rotates (input of anode rotation confirmation signal S4)
Only after confirming all the operating conditions, the coincidence signal S5
will be output.

The excitation coil 33 of the minus number circuit 27a drives the contact 38a of the 1-irradiation control circuit 18' as shown in FIG.

This irradiation control circuit 18' controls the opening and closing of the X-ray irradiation switch 2 shown in FIG. and an excitation coil 40 that drives the X-ray irradiation switch 2. Then, as mentioned above, for example, the operating state of the first X-ray tube 1a is checked, and if everything is normal, the excitation coil 33 is excited and the contact 38a is closed.
When the contact 39a closes in conjunction with the changeover switch 11a, the excitation coil 40 is excited and the X-ray irradiation switch 2
Close. In FIG. 6, the reference numeral 38b is a contact driven by the excitation coil of the matching circuit 27b on the side of the second X-ray tube 1b (not shown), and the reference numeral 39b is a contact of the second X-ray tube 1b (not shown). This is a contact that operates in conjunction with a selector switch 11b (see FIG. 3) that selects the switch 1b. And the contact 38a
.

Since the series 39a and the series 38b and 39b are connected in parallel, regardless of whether the first X-ray tube 1a side or the second X-ray tube 1b side is activated, the X-ray irradiation switch 2 can be closed.

In the X-ray control device configured as described above, for example, in order to irradiate X-rays from the first X-ray tube 1a, first, the first changeover switch 11 at=ON is turned on and the first X-ray tube 1a is turned on. Select. As a result, as shown in FIG. 6, the tube selection inspection contact 31 (outputs the selection signal S1) of the matching circuit 27a that is linked with the changeover switch 11a and the irradiation control circuit 18
' contact 39a is closed. At the same time, 1 first X
The excitation coil Ta of the high voltage switch on the wire tube 1a side is excited, turning on the contacts 8a and 9a of the filament 3a, and turning on the contact 10a of the anode 5a. By closing the contacts 8a and 9a as described above, current flows through the primary and secondary sides of the filament heating transformer 4, and the filament 73a lights up. Then, the photodiode 35 shown in FIG. 4 detects this lighting light, and the filament lighting detector 29 is activated to issue a lighting confirmation signal S3.
Output. In addition, as shown in FIG.
When a closes, the switching operation completion detector 30 turns ON,
A switching confirmation signal S2 is output. Meanwhile, at the same time, an anode drive circuit 6 rotates the anode 5a of the first X-ray tube 1a.
a (see FIG. 3) is also activated, and the anode 5a rotates. Then, this rotation sound is detected by the microphone 34 shown in FIG. 4, and the anode rotation detector 28 is activated to output an anode rotation confirmation signal S4. And all the above signals 511S2
When 1S51S4 is input to the AND gate 32, it is determined that all operations of the first X-ray tube 1a are normal, and a coincidence signal S5 is output, which excites the excitation coil 33 of the minus number circuit 2γa. This exciting coil 33 closes the contact 38a of the irradiation control circuit 18' shown in FIG. Here, since the other contacts 39a are already closed as described above, the excitation coil 40 is immediately excited and the X-ray irradiation switch 2 is closed. As a result, a high voltage is applied from the high voltage rectifier 15 to the anode 5a via the contact 10a, and the first XIvi!
X-rays are irradiated from the tube 1a. Next 1 second X-ray tube 1b
K to irradiate XAI from the second changeover switch 11
If bt-ONK is performed, X-rays are irradiated in the same manner.

In addition, in the above explanation, matching circuit 27a+21b#'i
,, an X-ray tube selection signal S1, a high-voltage switch switching confirmation signal S2, an X-ray tube filament lighting confirmation signal S5,
Although the explanation has been made by taking the AND of the four signals of the anode rotation confirmation signal S4, the present invention is not limited to this, and as a minimum, the selection signal S1 and the other 82.85. The two signals may be ANDed with any one signal of S4 to output a coincidence signal S5. Even just the AND condition of these two signals is expected to be much more effective than the conventional method, and it is possible to prevent the X-ray tubes 1a+1b from being destroyed. Furthermore, the above-mentioned selection signal S1 is ANDed with any two of the other 82*Ss)S4 signals to generate a match signal S5.
You may also press it to output. In addition, although FIG. 3 shows the X-ray tube as having two X-ray tubes, the present invention
The same applies to those having three or more wire tubes.

Effects of the Invention As described above, the present invention provides each X-ray tube 18.1b with an X-ray tube selection signal S1 for irradiating X-rays, and an Xa tube filament lighting confirmation signal S5 or an anode rotation confirmation signal. A coincidence circuit 278t2 that detects whether either s4 or the switching confirmation signal S2 of the high voltage switching device matches one signal.
7b, the actual operating state of each X-ray tube 1a or 1b can be correctly confirmed, and only when two or more of these signals match, the matching circuit 27a'y.

can close the X-ray irradiation switch 2 by the coincidence signal 85 of 27b. Here, if each circuit in the X-ray control device malfunctions, breaks, etc., the matching circuit 27a
+27b cannot be ANDed, and the matching circuits 27a and 27b do not output the matching signal S5. Therefore, if the filament of the X-ray tube 1a or 1b selected by the operator according to the purpose of X-ray irradiation is not lit or the anode is not rotating, the X-ray irradiation switch 2 is not closed and can be interlocked from applying high voltage to the X-ray tube. Therefore, it is possible to prevent the expensive X-ray tube from being destroyed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional X-ray control device, FIG. 2 is a circuit diagram showing its irradiation control circuit, and FIG. 3 is a circuit diagram showing a conventional X-ray control device.
FIG. 4 is a circuit diagram showing the line control device, FIG. 4 is a circuit diagram showing a matching circuit, FIG. 5 is an explanatory diagram showing the operation of the switching operation completion detector of the high voltage switch, and FIG. 6 is a circuit diagram showing the irradiation control circuit. It is. la, lb...X-ray tube, 2...X-ray irradiation switch N
3a l 3b...Filament, 4...Filament heating transformer, 5a. 5b...N13 pole, Bar 6b...Anode drive circuit, 7a, l1la-9a, 10a; 7b, 8b
, 9b, 10b...high voltage switching device, 11a, 1
l b-...Selector switch, 18'... Irradiation control circuit, 27a, 27b... Coincidence circuit, 28... Anode rotation detector, 29... Filament lighting detector, 3
゜...Switching operation completion detector of high voltage switching device, 31...
Pipe selection detection contact, 32...AND gate, Sl...
X-ray tube selection signal, Sl... switching confirmation signal, S3...
・Lighting confirmation signal, S4... Anode rotation confirmation signal, s5・
... Match signal. Applicant Hitachi Medical Co., Ltd. Figure 4 27゜No. 51￥1 7゜Figure 6

Claims (1)

[Claims] 1. A plurality of X-ray tubes, an X-ray irradiation switch that controls X-ray irradiation from these X-ray tubes, and a filament heating transformer that lights the filaments of the X-ray tubes; The Xl11 control device includes an anode drive circuit that rotates the anode of the X-ray tube, a high voltage switch that switches high voltage application to the anode, and a changeover switch that selects the X-ray tube to be irradiated with X-rays. X to irradiate each X-ray tube with X-rays
A coincidence circuit is provided to detect a coincidence between the selection signal of the ray tube and any one of the lighting confirmation signal of the X-ray tube filament, the anode rotation confirmation signal, or the switching confirmation signal of the high voltage switch. An X-ray control device characterized in that the X-ray irradiation switch is closed in response to coincidence signals from several circuits. 2. The above-mentioned - several circuits are a combination of two or more signals: a selection signal for an X-ray tube to be irradiated with X-rays, a lighting confirmation signal for an X-ray tube filament, an anode rotation confirmation signal, or a switching confirmation signal for a high-voltage switch. 2. The X-ray control device according to claim 1, wherein the X-ray control device operates based on the coincidence of the following.