JP2007151733A - Radiographic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide radiographic apparatus capable of improving a radiographing throughput and elongating the service life of a radiation field lamp by lighting the radiation field lamp only in adjusting the X-ray radiation field. <P>SOLUTION: A subject 1 is irradiated with X-rays from an X-ray generation device 2, a radiographing area of a subject 1 is irradiated with light of the radiation lamp 3 when adjusting the X-ray irradiating range and the X-ray irradiation field is adjusted by an X-ray variable diaphragm device 4. This radiographic apparatus is provided with an X-ray radiation field adjustment finish signal detecting means detecting the finish of the X-ray irradiation field adjustment, and an irradiation field lamp lighting time control means controlling the lighting time of the radiation field lamp 3 corresponding to the X-ray irradiation field adjustment finish signal detected by the detecting means. The X-ray irradiation field adjustment finish signal detecting means has an operation detecting device 8 detecting the mechanical operation of a radiographing mechanism, and the irradiation field lamp lighting time control means has an irradiation field lamp control device 9 turning off the irradiation field lamp 3 by the finish signal of the mechanical operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an X-ray imaging apparatus, and in particular, an X-ray having a function of adjusting an X-ray irradiation field irradiated to the subject by irradiating irradiation light of an irradiation field lamp to an imaging region of the subject. The present invention relates to a photographing apparatus.

  In the X-ray imaging device, in order to reduce the exposure X-ray dose and improve the image quality, the X-ray tube is used to irradiate X-rays to the imaging area of the subject and not to irradiate other areas. The X-ray movable diaphragm device attached to the radiation opening of the X-ray tube is used to narrow the irradiation range of X-rays emitted from the X-ray tube.

The setting of the X-ray irradiation field by this X-ray movable diaphragm device, as disclosed in Patent Document 1, examines the irradiation light of the irradiation field lamp provided inside the X-ray movable diaphragm device before imaging. The X-ray irradiation field of view is confirmed while aiming at the person's imaging region, and the X-ray aperture range, that is, the X-ray irradiation field is adjusted so that this irradiation field is obtained.
When this adjustment is completed, the irradiation field lamp is turned off, and after completion of predetermined preparations such as heating of the filament of the X-ray tube and rotation of the rotating anode, the subject is irradiated with X-rays to perform imaging.

The adjustment of the X-ray irradiation field according to Patent Document 1 is provided with an irradiation field lamp switch for turning on and off the irradiation field lamp, and the operator turns on the irradiation field lamp with the irradiation field lamp switch to perform X-ray irradiation. Adjust the field, and after this adjustment is complete, turn off the light and start shooting.
In the X-ray imaging apparatus for adjusting the X-ray irradiation field in this way, the adjustment is performed while or after positioning so that X-rays are irradiated to the imaging region of the subject. Since the operator's line of sight is poured into the irradiation field lamp switch when the field lamp is turned on and off, if the subject moves during this operation, positioning must be performed again.
Also, the operation of the irradiation field lamp switch is troublesome.

Therefore, to adjust the irradiation field while positioning the imaging region without removing the line of sight from the subject, and to reduce the operation of the irradiation field lamp switch, the irradiation field lamp is lit regardless of the imaging region or imaging position. The irradiation field was adjusted at a constant time.
JP 2003-175030 A

  However, if the lighting time of the irradiation field lamp is made constant as described above, it takes a lot of time to position the subject's imaging region. For example, in the case of cold well imaging, during the irradiation field adjustment The irradiation field lamp is turned off after the predetermined lighting time has elapsed. For this reason, since the irradiation field lamp switch must be turned on again to light up, the work efficiency of the preparation for photographing is lowered.

Therefore, to solve this, the illumination field lamp lighting time should be set according to the imaging part and imaging position that require the most time to adjust the irradiation field. When the adjustment of the irradiation field as described above is short, it may be in a state where the light is not extinguished even after the photographing is finished.
In addition, if the illumination field lamp is turned on for a long time, the lamp is consumed and the lamp is burned out. For this reason, the lamp must be replaced and the irradiation field must be adjusted again.
Further, since an expensive halogen lamp is used as the irradiation field lamp, if the life of the irradiation field lamp is shortened, the maintenance cost of the lamp also increases. For this reason, it is desirable to minimize the lighting time of the irradiation field lamp.

  The present invention has been made in view of the above circumstances, and the X-ray is capable of turning on the irradiation field lamp only during the irradiation field adjustment to improve the imaging throughput and extend the life of the irradiation field lamp. An object is to provide a photographing apparatus.

The above object is achieved by the following means.
(1) X-ray generation means for generating X-rays to be irradiated to the subject, X-ray movable diaphragm means for limiting the X-ray irradiation field irradiated to the imaging area of the subject, and the X-ray movable When adjusting the X-ray irradiation field by the diaphragm means, an irradiation field lamp for aiming the irradiation light at the imaging region of the subject, and the transmitted X-ray of the subject arranged opposite to the X-ray generation means An X-ray detection means for detecting, an X-ray generation means, an X-ray movable diaphragm means, an imaging mechanism by an irradiation lamp and a support means for supporting the X-ray detection means, and an operation means for operating the imaging mechanism are provided. X-ray imaging apparatus configured, X-ray irradiation field adjustment end signal detection means for detecting a signal after the adjustment of the X-ray irradiation field, and X detected by this X-ray irradiation field adjustment end signal detection means Irradiation field lamp lighting time system that controls the lighting time of the irradiation field lamp in response to the irradiation field adjustment end signal And means.

(2) The X-ray irradiation field adjustment end signal detection means includes an operation detection means for detecting a mechanical operation of the imaging mechanism, and the operation detection means turns on the irradiation field lamp to adjust the irradiation field. Means for detecting a mechanical operation of the imaging mechanism from the start to the end and outputting an end signal of the mechanical operation, wherein the irradiation field lamp lighting time control means is the mechanical operation end signal A means for turning off the irradiation field lamp was provided.

(3) The operation detection means is a means for detecting an adjustment operation of the X-ray irradiation position from the X-ray generation means, a means for detecting an adjustment operation of the X-ray diaphragm range by the X-ray movable diaphragm means, A means for detecting an adjustment operation of the position of the X-ray detection means; a means for detecting an adjustment operation of the position of the support means; and a non-operation detection means for detecting all non-operations of the adjustment operation detection means. It was.

(4) The apparatus further includes a subject table on which the subject is placed, and a means for detecting an adjustment operation of the position of the subject table, and the non-operation detection of the means is included in the non-operation detection means. It was configured as follows.

The X-ray imaging apparatus configured in this way detects the end of adjustment of the X-ray irradiation field by the X-ray irradiation field adjustment end signal detection means, and controls the lighting time of the irradiation field lamp by the irradiation field lamp lighting time control means. Therefore, the illumination field lamp lighting time can be optimized regardless of the length of the irradiation field adjustment time.
This eliminates the problem that the illumination field lamp switch has to be turned on again to light up as in the prior art, and the imaging throughput is improved.
In addition, since the illumination field lamp can always have a lighting time corresponding to the photographing condition, useless lighting is eliminated and the lifetime of the radiation field lamp is prolonged.

(5) Further, the irradiation field lamp lighting time control means includes an extinguishing delay means for turning off the irradiation field lamp after a predetermined time from the mechanical operation end signal.

  As described above, since the irradiation field lamp extinguishing delay time is provided, the irradiation field can be confirmed with a sufficient margin by this time.

According to the present invention, since the irradiation field lamp is not turned off during the X-ray irradiation field adjustment by the X-ray irradiation field adjustment work confirmation and end detection signal detection means, the irradiation field lamp switch is again turned on as in the conventional case. The problem of having to turn on and light is eliminated, and shooting throughput is improved.
In addition, since the illumination field lamp can always have a lighting time corresponding to the photographing condition, useless lighting is eliminated and the lifetime of the radiation field lamp is prolonged.

Hereinafter, preferred embodiments of an X-ray imaging apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing a configuration of an X-ray imaging apparatus according to the first embodiment of the present invention.
In the X-ray imaging apparatus of FIG. 1, the subject table on which the subject 1 is placed is a hindrance so that the subject 1 can take an image in a standing posture or a sitting posture using a chair. Or an X-ray generator 2 equipped with an X-ray tube for generating X-rays for irradiating the subject 1 and adjusting the X-ray irradiation field. An X-ray movable diaphragm device 4 for limiting the X-ray irradiation range with a built-in irradiation field lamp 3, and the X-ray generation device 2 and the X-ray movable diaphragm device 4 arranged opposite to each other and transmitted X-rays of the subject 1 An X-ray detection device 5 for detecting the X-ray, a C-arm support device 6 for supporting the X-ray generation device 2, the X-ray movable diaphragm device 4 and the X-ray detection device 5, and the C-arm support device 6 Supporter driving device 7 for positioning at the imaging region of the examiner 1, the X-ray generation device 2, the X-ray movable diaphragm device 4, the X-ray detection device 5, and the An operation detection device 8 for detecting the operation state of the C-arm support 6, an irradiation field lamp control device 9 for controlling the lighting and extinguishing time of the irradiation field lamp 3 by the detection signal of the operation detection device 8, and the X-ray An image processing device 10 that performs image processing on the data detected by the detection device 5 and generates a captured image to be displayed from the processed image data, and a display device 11 that displays the captured image generated by the image processing device 10 And setting the patient name, imaging region, imaging direction, imaging X-ray conditions, various parameters necessary for the image processing, and the operation command of each element to control the entire X-ray imaging apparatus And the operating device 12.

The X-ray generator 2 generates an X-ray dose corresponding to the voltage applied between the anode and the cathode of the X-ray tube, the current flowing between the anode and the cathode, and the imaging time, which are the imaging conditions set by the operation device 12. Thus, the X-ray high voltage device (not shown) is controlled.
The X-ray generator 2 has a mechanism for rotating the X-ray tube of the apparatus (used when adjusting the X-ray irradiation direction, hereinafter referred to as the X-ray tube rotation mechanism) and can be slid up and down. A mechanism (for adjusting the offset position of the X-ray tube in the vertical direction with respect to the X-ray detection center of the X-ray detection apparatus 5, hereinafter referred to as an X-ray tube vertical slide mechanism). Yes.

  The X-ray movable diaphragm device 4 includes an irradiation field lamp 3 for aiming irradiation light at the examination site of the subject 1 when adjusting the X-ray irradiation field, and movable blades (lead plates) on four sides. Is used to limit the X-ray irradiation field to an appropriate range (hereinafter referred to as an X-ray aperture mechanism).

  The X-ray detector 5 includes an X-ray detector that detects X-rays that have passed through the subject 1 and a mechanism that moves the X-ray detector up and down (hereinafter referred to as an up-and-down movement mechanism of the X-ray detector). The X-ray detector may be any detector as long as it can detect transmitted X-rays of the subject, but the X-ray imaging apparatus shown in FIG. X-ray flat panel detector, which is a combination of image intensifier and CCD (Charge Coupled Device) camera, or semiconductor digital X-ray detector In this example, a detector called (Flat Panel Detector) is used, digital X-ray data detected by these detectors is subjected to image processing by the image processing device 10 and an X-ray image is displayed on the display device 11.

  The C-arm support 6 is supported by a support (not shown) (support such as a fluoroscopic imaging table or a ceiling), and is configured to be able to rotate and move up and down and to the left and right. Drive controlled.

  In order to irradiate only the imaging region of the subject 1 with X-rays, the X-ray irradiation field turns on the irradiation field lamp 3 and rotates the C-arm support 6 and moves up and down, left and right. While adjusting the position, the vertical slide position and X-ray emission direction of the X-ray tube of the X-ray generator 2, and the vertical position of the X-ray detector of the X-ray detector 5, the X-ray movable diaphragm device 4 The X-ray aperture range is adjusted by the above, and after this adjustment, the irradiation field lamp 3 is turned off, and the subject 1 is irradiated with X-rays from the X-ray generator 2 for imaging.

  X-ray tube rotation mechanism and X-ray tube vertical slide mechanism of the X-ray generator 2, X-ray movable diaphragm device X-ray diaphragm mechanism 4, X-ray detector vertical movement mechanism of X-ray detector 5 and C Since the support device drive device 7 of the arm support device 6 includes a motor for driving each of the mechanisms, the number of rotations of these motors is detected by an encoder, and the output of each of the drive mechanisms is detected from an output pulse of the encoder. Motion can be detected.

Thus, in order to automatically turn off the irradiation field lamp 3 after the adjustment of the X-ray aperture range, the present invention includes the motion detection device 8 and the irradiation field lamp control device 9. .
That is, during the adjustment of the X-ray irradiation field, at least one of the C-arm support device 6, the X-ray generator 2, the X-ray detector 5, and the X-ray movable diaphragm device 4 is operating. The operation detection device 8 detects these operation signals, and the irradiation field lamp control device 9 controls the lighting time of the irradiation field lamp 3, and the adjustment of the X-ray aperture range is completed. An end signal is detected by the motion detection device 8, and a signal for turning off the irradiation field lamp 3 is generated by the irradiation field lamp control device 9 based on this detection signal, and the irradiation field lamp 3 built in the X-ray movable diaphragm device 4 is turned off. To do.
The motion detection device 8 corresponds to the X-ray irradiation field adjustment end signal detection means in the claims, and the irradiation lamp control device 9 corresponds to the irradiation field lamp lighting time control means in the claims.

FIG. 2 is a flowchart of processing from turning on and off of the irradiation field lamp according to the first embodiment of the present invention.
(1) In order to adjust the X-ray irradiation field, the irradiation field lamp 3 provided in the vicinity of the X-ray movable diaphragm device 4 is turned on (S21).
(2) When an on signal of the irradiation field lamp 3 is input to the irradiation field lamp control device 9, the irradiation field lamp control device 9 sets an initial value of the lighting time of the irradiation field lamp 3 and performs the irradiation. The lighting of the field lamp 3 is started (S22).
(3) The motion detection device 8 performs the irradiation field adjustment motion detection process (S23), the X-ray tube rotation mechanism and the X-ray tube vertical slide mechanism operation of the X-ray generator 2 (S24), X-ray movable Operation of the X-ray diaphragm mechanism of the diaphragm device 4 (S25), operation of the vertical movement mechanism of the X-ray detector of the X-ray detector device 5 (S26), operation of the support device driving device 7 of the C-arm support device 6 Each mechanical operation of (S27) is detected.
(4) If any one of the X-ray generator 2, the X-ray movable diaphragm 4, the X-ray detector 5 and the C-arm support 6 detects mechanical motion, the irradiation field is being adjusted. Thus, the lighting time of the irradiation field lamp is extended by a predetermined time (S28), the process returns to step S23, and the detection of the mechanical operation is continued.
(5) If it is detected that all of the X-ray generator 2, X-ray movable diaphragm device 4, X-ray detector 5 and C-arm support 6 are inactive (S30), the irradiation field is adjusted. Although the process has been completed, the irradiation field lamp 3 is not turned off immediately, the turn-off time is delayed by a predetermined time (S29), and the irradiation field lamp 3 is turned off (S31).

It should be noted that the irradiation field lamp 3 is not turned off immediately upon detection of all non-operations of the X-ray generation device 2, the X-ray movable diaphragm device 4, the X-ray detection device 5 and the C-arm support 6 and is turned off after a predetermined time has elapsed This is because it is preferable to provide a delay time of about several seconds since it takes time to confirm the irradiation field.
If an operation is detected by the operation detecting means 8 at this time, the process returns to (4) and the detection of the mechanical operation is continued.

  Further, the adjustment time of the irradiation field varies depending on the imaging region, the imaging position (imaging posture), and the imaging technique, so the initial value of the irradiation field lamp lighting time and the irradiation field lamp lighting time of the irradiation field lamp control device 9 The parameters such as the extension time are a table of the relationship between the imaging region, the imaging position (imaging posture), the imaging technique and the parameter, and the parameters suitable for imaging are selected from this relationship to turn on the irradiation field lamp 3 and By controlling the turn-off time, the irradiation field can be adjusted efficiently.

  For example, in the case of radiography of the front of the chest, positioning of the radiographic region and adjustment of the irradiation field are short, so the lighting time of the irradiation field lamp 3 is shortened. If you spend a lot of time on positioning of the imaging region and adjustment of the irradiation field, such as moving the device 5 to set the center of the irradiation field at a certain angle, the irradiation time of the irradiation field lamp is automatically lengthened and irradiation is performed. Regardless of the length of the field adjustment time, any irradiation field adjustment can be easily handled.

  In this way, the operation detection device 8 detects the end of the irradiation field adjustment, and the irradiation field lamp control device 9 controls the lighting time of the irradiation field lamp to a value corresponding to the photographing application with this detection signal. During the irradiation field adjustment, the problem of the illumination field lamp being extinguished and out of lamp can be solved, and the imaging throughput can be improved and the irradiation field lamp life can be extended.

FIG. 3 is a schematic diagram showing a configuration of an X-ray imaging apparatus according to the second embodiment of the present invention.
The X-ray imaging apparatus of FIG. 3 is a case where the subject 1 is placed on the subject table 13 and imaged.At the time of positioning the subject 1 on the imaging region and adjusting the X-ray irradiation field, Since the movement of the subject table 13 is also accompanied, it is necessary to detect the operation of the subject table 13 for the lighting control of the irradiation field lamp.
For this purpose, it is provided with a subject table movement drive device 14 for moving the subject table 13 back and forth, left and right, and up and down, and an operation signal of this device is input to the operation detection device 8 'to provide an irradiation field lamp control device. The end of irradiation field adjustment is detected by 9 ′ in the same manner as in the first embodiment.
Other configurations and operations are the same as those of the first embodiment shown in FIG.

FIG. 4 is a flowchart of processing from turning on and off of the irradiation field lamp according to the second embodiment of the present invention.
This flowchart is obtained by adding operation detection of the subject table to the irradiation field adjustment operation detection of the flowchart shown in FIG. 2, and operates as follows.
(1) In order to adjust the X-ray irradiation field, the irradiation field lamp 3 provided in the vicinity of the X-ray movable diaphragm device 4 is turned on (S41).
(2) When an on signal of the irradiation field lamp 3 is input to the irradiation field lamp control device 9 ′, the irradiation field lamp control device 9 ′ sets an initial value of the lighting time of the irradiation field lamp 3. Lighting of the irradiation field lamp 3 is started (S42).
(3) The motion detection device 8 ′ is an irradiation field adjustment motion detection process (S43), and the operation of the X-ray tube rotation mechanism and the X-ray tube vertical slide mechanism of the X-ray generation device 2 (S44), Operation of the X-ray diaphragm mechanism of the X-ray movable diaphragm device 4 (S45), operation of the vertical movement mechanism of the X-ray detector of the X-ray detector device 5 (S46), and supporter driving of the C-arm support device 6 Each mechanical operation of the operation of the apparatus 7 (S47) and the operation of the subject table (S48) is detected.
(4) If any one of the X-ray generator 2, the X-ray movable diaphragm device 4, the X-ray detector 5, the C-arm support 6 and the subject table 13 detects a mechanical motion, irradiation is performed. Since it is determined that the field is being adjusted, the lighting time of the irradiation field lamp is extended by a predetermined time (S49), the process returns to step S43, and the detection of the mechanical operation is continued.
(5) When it is detected that all of the X-ray generator 2, X-ray movable diaphragm device 4, X-ray detector 5, C-arm support 6 and subject table 13 are inactive (S51) Assuming that the adjustment of the irradiation field has been completed, the irradiation field lamp 3 is not turned off immediately, but the turn-off time is delayed by a predetermined time (S50), and the irradiation field lamp 3 is turned off (S52).

  Thus, when the subject table 13 is necessary, the operation of the X-ray generator 2 from the start of adjustment of the X-ray irradiation field, the operation of the X-ray movable diaphragm device 4, the operation of the X-ray detector 5 and the C In addition to the operation of the arm supporter 6, the operation of the subject table 13 is also detected, and the end of the adjustment of the X-ray irradiation field is detected by detecting these non-operations, and the irradiation field lamp is detected after a predetermined time from this detection. An irradiation field lamp extinction signal is output from the control device 9 ′, and the irradiation field lamp 3 is automatically extinguished.

  Further, as in the first embodiment, the adjustment time of the irradiation field varies depending on the imaging region, the imaging position (imaging posture), and the imaging technique, so the irradiation field lamp lighting time of the irradiation field lamp control device 9 ′ For parameters such as initial values and extension time of irradiation field lamp lighting time, table the relationship between the imaging part, imaging position (imaging posture), imaging technique and the parameter, and select parameters suitable for imaging from this relationship By controlling the lighting and extinguishing time of the irradiation field lamp 3, the irradiation field can be adjusted efficiently.

  As described above, even in the X-ray imaging apparatus including the subject table, the motion detection device 8 ′ detects the end of the irradiation field adjustment, and the detection signal indicates the lighting field lamp lighting time according to the imaging application. In the same manner as in the first embodiment, the irradiation field lamp control device 9 ′ controls the problem that the irradiation field lamp is turned off and the lamp burnout is solved during the irradiation field adjustment, and the imaging throughput is improved. The life of the irradiation field lamp can be extended.

The first embodiment and the second embodiment are examples in which the operating device 12 is provided close to the X-ray imaging mechanism, but the present invention is not limited to this, and the operating device 12 It can also be used for a remote-controlled X-ray imaging apparatus using a remote control apparatus installed in an operation room separate from the imaging room.
In this case, of course, the X-ray generator 2, the X-ray movable diaphragm device 4, the X-ray detector 5, the C arm support 6 and the subject table 13 are operated based on an operation command from the remote controller. To do.

  Further, in the X-ray imaging apparatus provided with the first embodiment, the second embodiment, and the remote control device of FIG. 1, the non-detection signals of the motion detection devices 8, 8 ′ which are irradiation field adjustment end signals Is fed back to the operation device 12, and this signal is input to the irradiation field lamp control devices 9 and 9 'so that the irradiation field lamp 3 is automatically turned off, or the X-ray generation device 2 and the X-ray movable diaphragm device. 4, the X-ray detection device 5, the C arm support device 6 and the driving mechanism of the subject table 13 are provided with means for detecting the start and end of the operation, and these detection signals are detected, and this is detected as an irradiation field lamp. A configuration may be adopted in which the irradiation field lamp 3 is automatically turned off by inputting to the control devices 9 and 9 ′.

1 is a schematic diagram showing the configuration of an X-ray imaging apparatus according to a first embodiment of the present invention. 6 is a flowchart of processing from turning on and off of the irradiation field lamp according to the first embodiment of the present invention. FIG. 5 is a schematic diagram showing a configuration of an X-ray imaging apparatus according to a second embodiment of the present invention. 10 is a flowchart of processing from turning on and off of the irradiation field lamp according to the second embodiment of the present invention.

Explanation of symbols

  2 X-ray generator, 3 irradiation field lamp, 4 X-ray movable aperture device, 5 X-ray detection device, 6 C-arm support device, 7 support device drive device, 8, 8 'motion detection device, 9, 9' irradiation field Lamp control device, 12 operation device, 13 subject table, 14 subject table movement drive device

Claims (5)

  X-ray generation means for generating X-rays to be irradiated to the subject, X-ray movable diaphragm means for limiting the X-ray irradiation field irradiated to the imaging region of the subject, and the X-ray movable diaphragm means An X-ray that detects the transmitted X-ray of the subject that is disposed opposite to the X-ray generation means and an irradiation field lamp that irradiates irradiation light to the imaging region of the subject when adjusting the X-ray irradiation field. An imaging mechanism including a ray detection means, the X-ray generation means, an X-ray movable diaphragm means, a support means for supporting the irradiation lamp and the X-ray detection means, and an operation means for operating the imaging mechanism. X-ray imaging apparatus for detecting X-ray irradiation field adjustment signal detecting means for detecting a signal indicating that the X-ray irradiation field is being adjusted, and X-ray irradiation detected by the X-ray irradiation field adjustment signal detecting means In response to the field adjustment signal, the illumination field lamp lighting time is controlled. X-ray imaging apparatus comprising a field lamp lighting time control means.   The X-ray irradiation field adjustment end signal detection means includes an operation detection means for detecting a mechanical operation of the imaging mechanism, and the operation detection means turns on the irradiation field lamp and ends from the adjustment start of the irradiation field. Means for detecting the mechanical operation of the imaging mechanism up to and outputting an end signal of the mechanical operation, wherein the irradiation field lamp lighting time control means is configured to detect the irradiation field lamp with the end signal of the mechanical operation. The X-ray imaging apparatus according to claim 1, further comprising means for turning off the light.   The operation detecting means detects means for adjusting an X-ray irradiation position from the X-ray generation means, means for detecting an adjustment operation of an X-ray diaphragm range by the X-ray movable diaphragm means, and the X-rays A means for detecting an adjustment operation of the position of the detection means, a means for detecting an adjustment operation of the position of the support means, and a non-operation detection means for detecting all non-operations of the adjustment operation detection means. Item 4. The X-ray imaging apparatus according to Item 1, 2, or 3.   The apparatus further includes a subject table on which the subject is placed, and a means for detecting an adjustment operation of the position of the subject table, and the non-operation detection of the means is included in the non-operation detection means. The X-ray imaging apparatus according to claim 3.   5. The X-ray imaging according to claim 2, 3 or 4, wherein the irradiation field lamp lighting time control means comprises an extinguishing delay means for turning off the irradiation field lamp after a predetermined time from the end signal of the mechanical operation. apparatus.

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