JP2006192185A - X-ray apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray apparatus in which an operator easily recognizes a deviation between a subject and an X-ray irradiation field. <P>SOLUTION: The X-ray apparatus comprises an X-ray irradiating means (X-ray tube 51); a mobile diaphragm 52 for adjusting the irradiation range of an X-ray to be generated by the irradiating means; an irradiation field lamp 52B for visualizing the X-ray irradiation range; an exposure control means 100 for controlling the start and stop of the X-ray irradiation from the X-ray irradiating means to the subject; and a lighting state change means for changing the lighting state of the irradiation field lamp 52B in synchronization with the start of the X-ray irradiation by the exposure control means 100. The lighting state of the irradiation field lamp is changed in synchronization with the start of the X-ray irradiation, so that the X-ray irradiation field is more correctly confirmed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an X-ray apparatus. In particular, the present invention relates to an X-ray apparatus that includes an irradiation field lamp that visualizes an irradiation range and can easily recognize a deviation between a light irradiation field confirmed by the irradiation field lamp and an actual X-ray irradiation field.

  As a roundabout X-ray apparatus, one shown in FIG. 1 is known (for example, Patent Document 1). This X-ray apparatus includes a dolly 10 that can travel, a main body 20 and a support 30 mounted on the dolly 10, an arm 40 that is mounted on the support 30 so as to be movable up and down, and an X-ray provided at an end of the arm 40. And a generator 50.

  The X-ray generation unit 50 includes an X-ray tube 51 and a movable diaphragm 52. The X-ray tube 51 irradiates the rotating anode with an electron beam generated by heating the filament to generate X-rays. On the other hand, inside the movable diaphragm 52, a movable diaphragm blade 52A for limiting the X-ray irradiation field generated in the X-ray tube 51, an irradiation field lamp 52B and an irradiation field lamp for visualizing the X-ray irradiation field. A mirror 52C is arranged so that the irradiation field of 52B coincides with the irradiation field of X-rays. The irradiation field lamp 52B is turned on by operating a lighting switch provided on the movable diaphragm 52, and the surgeon knows the X-ray irradiation range because the irradiation range of the light coincides with the X-ray irradiation field. be able to.

  When using this type of X-ray apparatus, the operator A first moves the X-ray apparatus near the subject B.

  Next, the X-ray irradiation field is adjusted. The X-ray irradiation field is adjusted by operating the lighting switch to light the irradiation field lamp 52B before performing X-ray imaging, adjusting the irradiation field by adjusting the direction of the X-ray tube 51 and the movable diaphragm 52, and thereafter X-ray irradiation is performed.

  X-ray irradiation is performed using, for example, a two-stage motion SW including a two-stage switch including an imaging preparation switch and an exposure start switch. In the case of an X-ray apparatus adopting the two-stage motion SW, first, the rotary anode of the X-ray tube 51 is rotated by operating the imaging preparation switch, and the filament of the X-ray tube 51 is heated. Next, when the rotation of the anode and the filament temperature are stabilized after elapse of a predetermined time, the operator A confirms the posture of the subject B, and then operates the exposure start switch at an appropriate timing. The X-ray tube 51 emits X-rays in synchronization with the operation of the exposure start switch.

  In this way, X-ray imaging is performed, and the irradiation field lamp 52B is turned on by operating a lighting switch, and is automatically turned off after 30 seconds, for example. Therefore, as shown in the timing chart of FIG. 4, the lighting of the irradiation field lamp and the X-ray exposure are not linked at all and may be performed with a time lag.

  In addition, regarding a technique for controlling the lighting state of the irradiation field lamp of the X-ray apparatus, an X-ray apparatus described in Patent Document 2 has also been proposed. This X-ray apparatus is an X-ray apparatus provided with a two-stage motion SW, and operates the imaging preparation switch to enter the imaging preparation complete state and simultaneously changes the lighting state of the irradiation field lamp.

JP 2001-70292 A JP 2003-175030 A

  However, the above X-ray apparatus has a problem that accurate confirmation of the irradiation field may be difficult.

  In the X-ray apparatus having the 30-second timer type irradiation field lamp, X-ray irradiation may be performed after the irradiation field lamp is turned off. At this time, if the subject moves between the time when the irradiation field lamp is extinguished and before the X-ray irradiation, a positional deviation between the irradiation field and the subject occurs. However, it is very difficult to recognize that the deviation has occurred. As a result, the positional deviation between the X-ray irradiation field and the subject can be recognized only after the development of the film obtained by X-ray photography is completed, and the rapid imaging cannot be performed again.

  In the technique of Patent Document 2, the main purpose is to know the ready state of X-ray irradiation without taking the eyes off the subject, and the lighting state of the irradiation field lamp is changed at the same time when the imaging preparation state is reached. Yes. Therefore, it is difficult to confirm the irradiation field from the start of imaging preparation to the completion of imaging preparation, and the same problem as the X-ray apparatus having the 30-second timer type irradiation field lamp may occur. Furthermore, it is difficult to confirm the irradiation field after clearly recognizing the start or stop of actual X-ray irradiation after the imaging preparation is completed.

  The present invention has been made in view of the above circumstances, and a main object thereof is to provide an X-ray apparatus capable of easily recognizing a deviation between a subject and an X-ray irradiation field.

  The present invention achieves the above object by making it possible to change the lighting state of the irradiation field lamp in synchronization with an imaging operation necessary for X-ray irradiation.

  The X-ray apparatus of the present invention includes an X-ray irradiation means, a movable diaphragm for adjusting the irradiation range of X-rays generated from the irradiation means, an irradiation field lamp for visualizing the X-ray irradiation range, and an X-ray irradiation means. Exposure control means for controlling the start and stop of the imaging operation necessary for irradiating the subject with X-rays. And it has the lighting state change means which changes the lighting state of an irradiation field lamp synchronizing with the start of the said imaging | photography operation | movement by this exposure control means.

  According to the X-ray apparatus of the present invention, the lighting state of the irradiation field lamp is changed in synchronization with the start of the imaging operation necessary for irradiating X-rays. Therefore, there is no time difference between the start of the imaging operation and the change in the lighting state of the irradiation field lamp, and the X-ray irradiation field can be confirmed more accurately.

  Hereinafter, the present invention will be described in more detail.

  The X-ray apparatus according to the present invention includes, as a basic configuration, an X-ray irradiation means, a movable diaphragm that adjusts the irradiation range of X-rays generated from the irradiation means, an irradiation field lamp that visualizes the X-ray irradiation range, and X Exposure control means for controlling the start and stop of X-ray irradiation from the beam irradiation means to the subject.

  An X-ray tube is typically used as the X-ray irradiation means. The movable diaphragm is usually provided with movable diaphragm blades for limiting the X-ray irradiation field. Moreover, the irradiation field lamp should just be what can irradiate visible light. Usually, this irradiation field lamp is used in combination with a mirror so as to have a light irradiation field that matches the X-ray irradiation field, and the X-ray irradiation field can be confirmed by visual observation of this light irradiation field. .

  And the exposure control means should just have the function which can start at least X-ray exposure. For example, a configuration having an X-ray switch for starting X-ray imaging, or a configuration having a two-stage motion SW including a two-stage switch of an imaging preparation switch and an exposure start switch. In the case of an X-ray switch, a preparatory operation necessary for X-ray irradiation is started by this switch operation, X-rays are generated from the X-ray tube following the completion of the preparatory operation, and X-rays are applied to the subject for a predetermined time. Irradiate the line. In the case of the two-stage motion SW, the preparation operation necessary for X-ray irradiation is started by operating the imaging preparation switch, and X-rays are generated from the X-ray tube by operating the exposure start switch, and the subject is inspected for a predetermined time. Are irradiated with X-rays. That is, it is only necessary to generate X-rays from the X-ray tube by these switch operations and to irradiate the subject with X-rays for a predetermined time. Preparation operations necessary for X-ray irradiation include rotation of a rotating anode in an X-ray tube and heating of a filament for generating an electron beam irradiated to the rotating anode.

  The X-ray apparatus of the present invention has lighting state changing means for changing the lighting state of the irradiation field lamp in synchronization with the start of the imaging operation by the exposure control means. For example, in the case of an apparatus having an X-ray switch for starting X-ray imaging, the lighting state of the irradiation field lamp is changed in synchronization with the operation of the X-ray switch. In the case of a two-step motion switch, X-ray irradiation is started by changing the lighting state of the irradiation field lamp in synchronization with the operation of the radiography preparation switch, or by operating the exposure start switch. What is necessary is just to change the lighting state of a field lamp.

  The change of the lighting state by the lighting state changing means includes various modes such as turn-off and turn-on, turn-off and blink, illumination field lamp brightness change, and irradiation field lamp color change. Specifically, the irradiation field lamp that has been turned off is turned on or blinked in synchronization with the start of X-ray irradiation, and the irradiation field lamp that has already been turned on is synchronized with the start of X-ray irradiation. It is possible to light up more brightly or change the color of the light.

  The lighting state changing means may change the lighting state of the irradiation field lamp in synchronization with the stop of the X-ray irradiation by the exposure control means. For example, the illumination field lamp that is lit may be controlled to be extinguished in synchronization with the stop of X-ray irradiation. With this configuration, it is possible to synchronize the start of the imaging operation / stop of X-ray irradiation and the change of the illumination field lamp extinction state, and the difference between the subject and the X-ray irradiation field during the imaging preparation operation or X-ray irradiation. Can be easily recognized.

  Furthermore, it is preferable to provide time control means for controlling the minimum irradiation time of the irradiation field lamp. In that case, by this time control means, when the X-ray irradiation time is shorter than the minimum irradiation time, the lighting state is changed after the minimum irradiation time has elapsed, and when the X-ray irradiation time is longer than the minimum irradiation time, the X-ray irradiation is stopped. The lighting state is changed in synchronization with. The X-ray irradiation time may be as short as several milliseconds, but even in such a case, ensuring the minimum irradiation time of the irradiation field lamp facilitates the deviation between the subject and the X-ray irradiation field. Can be recognized. The minimum irradiation time may be set to such a time that the deviation between the subject and the X-ray irradiation field can be sufficiently confirmed visually.

  The present invention can be applied to any mobile X-ray apparatus having a dolly that can travel as well as a normal fixed X-ray apparatus.

  According to the device of the present invention, the following effects can be achieved.

  (1) Since the lighting state of the irradiation field lamp is changed in synchronization with the start of the imaging operation necessary for X-ray irradiation, there is no time difference between the start of the imaging operation and the change of the lighting state of the irradiation field lamp. The irradiation field can be confirmed more accurately. As a result, when a deviation between the subject and the X-ray irradiation field is recognized, re-imaging can be performed immediately without waiting for the development of the film.

  (2) As the start of the imaging operation in which the lighting state of the irradiation field lamp is synchronized, either the start of the X-ray irradiation preparation operation or the start of X-ray irradiation can be selected. In the former case, the X-ray irradiation field can be confirmed even during the preparation operation. In the latter case, the X-ray irradiation field can be confirmed after recognizing the start of X-ray irradiation.

  (3) As a lighting state changing means, a function for changing the lighting state of the irradiation field lamp in synchronization with the stop of the X-ray irradiation by the exposure control means is provided, so that the X-ray imaging operation starts and stops. In the meantime, the X-ray irradiation field can be reliably confirmed.

  (4) By providing a time control means for controlling the minimum irradiation time of the irradiation field lamp, the minimum irradiation time of the irradiation lamp can be secured even when the X-ray irradiation time is extremely short. Can be confirmed more accurately.

  (5) By providing driving means that enables the X-ray apparatus to travel, it can also be used as a mobile X-ray apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, a two-stage motion SW type mobile X-ray apparatus is taken as an example, and components having the same function are denoted by the same reference numerals in the respective drawings.

(overall structure)
As shown in FIG. 1, the X-ray apparatus includes a dolly 10 that can travel, a main body 20 and a column 30 mounted on the cart 10, an arm 40 that is mounted on the column 30 to be movable up and down, and an end of the arm 40. And an X-ray generation unit 50 provided in the unit.

(Cart)
The carriage 10 corresponds to the driving means of the X-ray apparatus, and includes drive wheels 11 driven by a motor, and a swivel driven caster 12 that adjusts the traveling direction of the X-ray apparatus.

(Body)
The main body 20 is provided with a photographing condition control mechanism and an operation panel 21 for inputting to the control mechanism. Further, in addition to a travel control mechanism such as forward / reverse / acceleration / deceleration / stop of the X-ray apparatus, a hand pushing portion 22 for inputting to the control mechanism is also provided. The surgeon controls the traveling of the X-ray apparatus by operating the hand pushing portion 22. In addition, an imaging switch 23 that commands imaging preparation operation and X-ray irradiation is also connected to the main body. As will be described later, the photographing switch 23 is a two-stage motion SW composed of a two-stage switch of a photographing preparation switch 23A and an exposure start switch 23B. X-ray irradiation is performed by the operation of 23B.

(Support)
On the other hand, the support column 30 is rotatably attached to the carriage 10. By rotating this column, the direction of the X-ray generator 50 held by the column 30 via the arm 40 can be arbitrarily adjusted.

(arm)
The arm 40 can be expanded and contracted by nesting a plurality of pipes. One end of the arm 40 is supported by a support through a slider that slides along the support and the X-ray generator 50 is attached to the other end. Normally, the slider is balanced with a weight (not shown) disposed in the support column 30 and can hold the arm 40 at a predetermined position along the support column. The vertical position of the X-ray generation unit 50 can be changed by moving the arm 40 up and down to change the vertical position relative to the column, and the horizontal position of the X-ray generation unit can be changed by extending and contracting the arm 40.

(X-ray generator)
The X-ray generation unit 50 includes an X-ray tube 51 and a movable diaphragm 52. The X-ray tube generates X-rays by irradiating a rotating anode (rotor) with an electron beam generated by heating a filament. Usually, since the X-ray irradiation cone of the X-ray tube is wider than the required X-ray irradiation field, the movable diaphragm 52 is used so that X-rays are not irradiated to parts unnecessary for X-ray diagnosis. Inside the movable diaphragm, the movable diaphragm blade 52A for limiting the X-ray irradiation field, the irradiation field lamp 52B for visualizing the X-ray irradiation field, and the irradiation field of the irradiation field lamp coincide with the X-ray irradiation field. A mirror 52C arranged as described above is provided. This irradiation field lamp is turned on for a predetermined time (here, 30 seconds) by operating a lighting switch 52D provided on the movable diaphragm, and is also turned on in synchronization with the start of X-ray irradiation as will be described later. To be controlled.

  The X-ray generator 50 is supported at the end of the arm 40 via a rotation mechanism 53 that rotates about an axis orthogonal to the direction of expansion and contraction of the arm 40.

(X-ray irradiation mechanism and irradiation lamp control mechanism)
FIG. 2 shows a functional block diagram of a mechanism that performs X-ray irradiation control and irradiation field lamp lighting control in the apparatus of the present invention.

  The apparatus of the present invention determines imaging conditions from an operation panel 21 provided in the main body through an X-ray condition setting circuit 28, and performs X-ray irradiation according to the imaging conditions. This X-ray irradiation is performed by an exposure control means 100 that controls the start and stop of X-ray irradiation. In addition, the apparatus of the present invention also includes a lighting state changing unit 200 that controls the lighting state of the irradiation lamp 52B in accordance with the X-ray irradiation state by the exposure control unit 100.

  The exposure control means 100 is configured to be able to control the preparation operation for X-ray irradiation. That is, the photographing switch 23 is configured as a two-stage motion SW composed of a two-stage switch of a photographing preparation switch 23A and an exposure start switch 23B.

  The shooting preparation switch 23A is connected to each of the rotor drive circuit 24A, the filament heating circuit 25A, and the Ready timer 26A. By operating the switch 23A, the respective constituent means are started to rotate the rotating anode, heat the filament, etc. Perform the actions necessary to prepare for shooting. The heating of the filament is controlled according to the imaging conditions in the X-ray condition setting circuit 28. The operator is informed that the preparation for photographing has been completed by turning on the Ready lamp 27A connected to the Ready timer 26A.

  The exposure start switch 23B is connected to an irradiation time limiting circuit 24B that controls to irradiate a predetermined irradiation time X-ray determined by the X-ray condition setting circuit 28. The irradiation time limiting circuit 24B is an inverter 25B. It is connected to the. Further, the inverter 25B is connected to the high voltage generation circuit 26B and configured to apply a predetermined voltage determined by the X-ray condition setting circuit 28 to the X-ray tube 51. The exposure start switch 23B is connected to a changeover switch 27B that switches between valid / invalid of the operation. The changeover switch 27B is controlled so that the exposure start switch 23B can be operated after the preparation for photographing is completed by the Ready timer 26A.

  On the other hand, the lighting state changing means 200 includes the irradiation time control circuit 24B, an irradiation field lamp power supply 61, a minimum time limit circuit 62, and a synchronous relay 63. Usually, the synchronous relay 63 is operated in synchronization with the time of X-ray irradiation by the irradiation time control circuit 24B. That is, the irradiation field lamp 52B is turned on in synchronization with the start of X-ray irradiation, and the irradiation field lamp 52B is turned off in synchronization with the stop of X-ray irradiation. However, when the X-ray irradiation time is short, the lighting time is extended by the minimum time control circuit 62 so that at least the time necessary for confirming the irradiation field can be secured. The minimum time control circuit 62 defines a minimum time for turning on the irradiation field lamp. If the X-ray irradiation time is shorter than the minimum time, control is performed so that the irradiation field lamp 52B is turned off after the minimum time has elapsed. Is done. Here, the irradiation time control circuit 24B and the minimum time control circuit 62 constitute time control means.

  The irradiation field lamp power supply 61 is connected to a 30-second timer 65 via a lighting relay 64 and further connected to a lighting switch 52D provided on the movable diaphragm. The irradiation field lamp 52B can be controlled to start the irradiation field lamp 52B only for 30 seconds by starting the 30-second timer 65 by operating the lighting switch 52D and further operating the lighting relay 64.

(Operation procedure)
In the X-ray apparatus having the above configuration, X-ray imaging is performed according to the following procedure. In the following description, reference is made to FIGS.

  First, the operator A operates the hand pushing portion 22 of the main body to move the X-ray apparatus near the subject B.

  Next, the X-ray generator 50 is aligned with the direction of the imaging region. This alignment is performed by appropriately selecting the movement of the X-ray apparatus, the rotation of the support column 30, the raising and lowering of the arm 40, the expansion and contraction of the arm 40, and the rotation of the X-ray generation unit 50 by the rotation mechanism 53.

  Next, the imaging conditions are determined from the imaging region, the imaging direction, the distance from the imaging region to the X-ray tube focus, and the like. This determination is performed by operating the operation panel 21 and selecting from the X-ray condition setting circuit 28.

  Subsequently, the X-ray irradiation field is determined. This determination is made by operating the lighting switch 52D to light the irradiation field lamp 52B. When the lighting switch 52D is operated, the 30-second timer 65 is started, the lighting relay 64 is operated, and the irradiation field lamp 52B is lit only for 30 seconds. That is, as shown in the timing chart of FIG. 3, the irradiation lamp is turned on only for 30 seconds after the lighting switch is operated, and then turned off. The surgeon determines the X-ray irradiation field by adjusting the opening degree of the movable diaphragm blade 52A while the irradiation lamp 52B is lit.

  When the determination of the X-ray irradiation field is completed, an imaging preparation operation is performed. First, the shooting preparation switch 23A is operated. By the operation of the switch 23A, the rotor drive circuit 24A is started to rotate the rotating anode, and at the same time, the filament heating circuit 25A is also started to start energization heating to the filament. At the same time, until the ready timer 26A is started and the rotation of the rotating anode and the heating of the filament are stabilized, the valid / invalid change-over switch 27B is made invalid to prohibit the X-ray irradiation. When the rotation of the rotating anode reaches the predetermined number of revolutions and the time for the filament heating to reach the predetermined value elapses, the output of the Ready timer 26A turns on the Ready lamp 27A to inform the operator that the preparation operation has been completed. . At the same time, the Ready timer 26A enables the changeover switch 27B to enable the operation of the exposure start switch 23B.

  Next, the operator A operates the exposure start switch 23B in anticipation of the X-ray irradiation timing. By operating this switch, the inverter 25B is operated through the irradiation time control circuit 24B for the time set by the X-ray condition setting circuit 28. By the operation of the inverter 25B, the high voltage generation circuit 26B applies the voltage set by the X-ray condition setting circuit 28 to the X-ray tube 51.

  The output of the irradiation time control circuit 24B operates the inverter 25B for a predetermined time and simultaneously operates the synchronous relay 63 to turn on / off the irradiation field lamp 52B in synchronization with X-ray irradiation. Here, as shown in the timing chart of FIG. 3, when the X-ray irradiation is started, the irradiation field lamp which has been turned off is controlled to be turned on.

  At this time, the lighting time of the irradiation lamp 52B is adjusted by the control of the minimum time limit circuit 62. When the X-ray irradiation time is shorter than the minimum time defined by the minimum time limit circuit 62, the irradiation field lamp 52B is controlled to be lit during the minimum time even if the X-ray irradiation is stopped. On the contrary, if the minimum irradiation time is longer than the X-ray irradiation time, the irradiation field lamp 52B is turned off in synchronization with the stop of the X-ray irradiation.

  As described above, according to the apparatus of the present invention, since the irradiation field lamp is turned on in synchronization with the start of X-ray irradiation, there is no time difference between the start of X-ray irradiation and the change in the lighting state of the irradiation field lamp. The X-ray irradiation field can be confirmed accurately.

  In addition, by controlling the minimum time limit circuit, even when the X-ray irradiation time is extremely short, the irradiation field lamp can be turned on while it is necessary to check the X-ray irradiation field. Confirmation can be performed more accurately.

(Modification)
In the above embodiment, the irradiation field lamp is turned on in synchronization with the operation of the exposure start switch 23B. However, the irradiation field lamp 52B may be turned on in synchronization with the operation of the imaging preparation switch 23A. Good. In that case, the irradiation field lamp 52B may be continuously lit from the time when (1) the radiography preparation switch 23A is operated to the end of the X-ray irradiation, or (2) the radiography preparation switch is operated. The lighting state of the irradiation field lamp 52B after the exposure start switch 23B is operated and the lighting state of the irradiation field lamp 52B after the exposure start switch 23B is operated are turned on. Anyway. Turning on the irradiation field lamp 52B in synchronization with the operation of the imaging preparation switch 23A can be easily realized by operating the synchronization relay 63 in accordance with, for example, an operation command for the imaging preparation switch 23A in FIG.

  The X-ray apparatus of the present invention can be suitably used as a medical X-ray apparatus.

It is a schematic diagram of an X-ray tube device. It is a functional block diagram of this invention apparatus. It is a timing chart which shows the operation timing of the irradiation field lamp by this invention apparatus. It is a timing chart which shows the operation timing of the irradiation field lamp by a conventional apparatus.

Explanation of symbols

10 trucks 11 drive wheels 12 driven casters
20 Main unit 21 Operation panel 22 Hand pushing part 23 Shooting switch
23A Shooting preparation switch 24A Rotor drive circuit
25A Filament heating circuit 26A Ready timer 27A Ready lamp
23B Exposure start switch 24B Irradiation time limit circuit 25B Inverter
26B High voltage generator 27B Selector switch 28 X-ray condition setting circuit
30 Strut 40 Arm 50 X-ray generator 51 X-ray tube 52 Movable diaphragm
52A Movable diaphragm blade 52B Irradiation field lamp 52C Mirror
52D Light switch 53 Rotating mechanism
61 Field lamp power supply 62 Minimum time limit circuit 63 Synchronous relay
64 relay 65 65 seconds timer
100 Exposure control means 200 Lighting state change means

Claims (5)

X-ray irradiation means;
A movable diaphragm for adjusting the irradiation range of X-rays generated from the irradiation means;
An irradiation field lamp for visualizing the X-ray irradiation range;
An exposure control means for controlling start and stop of an imaging operation necessary for irradiating the subject with X-rays from the X-ray irradiation means;
An X-ray apparatus comprising: lighting state changing means for changing the lighting state of the irradiation field lamp in synchronization with the start of the imaging operation by the exposure control means.   2. The X-ray apparatus according to claim 1, wherein the lighting state changing unit changes a lighting state of the irradiation field lamp in synchronization with the start of the X-ray irradiation preparation operation by the exposure control unit.   2. The X-ray apparatus according to claim 1, wherein the lighting state changing means changes the lighting state of the irradiation field lamp in synchronization with the start of X-ray irradiation by the exposure control means.   Furthermore, the said lighting state change means changes the lighting state of an irradiation field lamp synchronizing with the stop of X-ray irradiation by an exposure control means, The X in any one of Claims 1-3 characterized by the above-mentioned. Wire device. Furthermore, a time control means for controlling the minimum irradiation time of the irradiation field lamp is provided,
By this time control means, when the X-ray irradiation time is shorter than the minimum irradiation time, the lighting state is changed after the minimum irradiation time has elapsed, and when the X-ray irradiation time is longer than the minimum irradiation time, the X-ray irradiation is stopped. The X-ray apparatus according to claim 3, wherein the lighting state is changed.

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