JP3848348B2 - X-ray tube controller - Google Patents

Description

  The present invention relates to an X-ray tube control apparatus that includes a cathode and a rotating anode, and controls an X-ray tube that emits X-rays by irradiating an anode as a target with an electron beam output from the cathode.

There is known an X-ray CT apparatus that irradiates a patient as a subject, detects X-rays transmitted through the subject, and images an internal (cross-sectional) structure of the subject.
This X-ray diagnostic apparatus includes an X-ray tube that generates X-rays and irradiates a subject, and an X-ray detector that detects X-rays transmitted through the subject. And the periphery of the subject is rotated.

  FIG. 9 is a cross-sectional view showing the configuration of the X-ray tube. The X-ray tube 1 includes a cathode 2 that outputs an electron beam and an anode 3 that emits X-rays when irradiated with the electron beam, and a region through which the electron beam passes between the cathode 2 and the anode 3 is an electron. Formed in a vacuum to minimize line loss. That is, the cathode and anode are housed in a vacuum tube container 4.

  The cathode 2 is fixed to a predetermined portion of the tube container 4, and the anode 3 has a rotating shaft 5 fixed to the center thereof, and the rotating shaft 5 is fixed to the tube container 4 through two sets of bearings 6 and 7. It is pivotally supported. A seal is provided between the bearings 6 and 7 and the rotary shaft 5 in order to maintain the vacuum state of the tube container 4. The rotating shaft 4 fixed to the anode 3 constitutes an induction motor together with the coil 8 and rotates.

  The anode 3 is formed in a disk shape from a metal material, and its periphery is inclined at a predetermined angle. The inclined slope is irradiated with an electron beam output from the cathode 2, and a part of energy generated by the irradiation of the electron beam is emitted as X-rays. Most of the remaining energy is converted to thermal energy. X-rays radiated from the anode 3 pass through a transmission part 4-1 formed in a part of the tube container 4, and are irradiated to the subject through a collimator (slit) (not shown).

  The heat generation effect on the anode 3 by the electron beam is large, and the anode 3 expands at a high temperature. Then, the inclined surface of the anode 3 also moves forward in the direction of the cathode 2, and the collimator is fixed. Therefore, the incident angle of the X-ray is shifted, and the X-ray irradiation position on the subject may be shifted. Such a shift has a problem that sensitivity correction of the X-ray image becomes ineffective.

  Therefore, there is known a conventional X-ray diagnostic apparatus that performs correction by FSMC (Focal Spot Movememt Correction). This is because pre-photographing is performed before the main photographing for photographing the subject, and the irradiation position of the electron beam (hereinafter referred to as the focal position) on the slope of the anode in this pre-photographing is detected by a detector set outside the apparatus. Then, the focal position displacement is divided into a plurality of stages, and correction data is calculated from each stage and the photographing shift at that time. During actual photographing of the actual subject, the photographed data is corrected by software processing using correction data set for each stage of the focal position displacement.

  As described above, in the conventional X-ray diagnostic apparatus, since correction by FSMC is performed, preliminary imaging has to be performed, and there is a problem that it takes time to collect correction data.

  In addition, there is a problem that software processing for correcting photographed data with correction data is necessary.

  Accordingly, an object of the present invention is to provide an X-ray tube control apparatus capable of preventing a shift in an X-ray irradiation position due to thermal expansion of an anode of an X-ray tube.

  In order to achieve the above object, the present invention comprises a cathode and a disk-shaped anode having a slope around it and rotatably supported by a tube vessel, and targets an electron beam output from the cathode A surface position measuring means for measuring the surface position of the anode in an X-ray tube control apparatus for controlling an X-ray tube that irradiates the inclined surface of the anode as X-rays to the outside of the tube container; And a means for adjusting the position of the anode in the rotation axis direction by moving the tube container in the rotation axis direction of the anode based on the surface position measured by the surface position measuring means. .

  ADVANTAGE OF THE INVENTION According to this invention, the X-ray tube control apparatus which can prevent the shift | offset | difference of the X-ray irradiation position by the thermal expansion of the anode of an X-ray tube can be provided. Further, since a driving mechanism such as a motor for movement is provided outside the X-ray tube, it can be attached to an existing X-ray tube.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing a schematic configuration of main parts of an X-ray diagnostic apparatus.
X-rays radiated in a fan shape from the X-ray tube 11 through a collimator (not shown) are transmitted through one section of the subject 12 and are detected by an X-ray detector 13 in which a plurality of X-ray detection elements are arranged in a row. Detected. The positional relationship between the X-ray tube 11 and the X-ray detector 13 is fixed and rotates around the subject 12 as indicated by the arrow in FIG.

  FIG. 2 is a cross-sectional view showing the configuration of the X-ray tube 11. The X-ray tube 11 is configured by accommodating a cathode 21 and an anode 22 in a vacuum tube container 23. The cathode 21 is fixed at a predetermined location of the tube vessel 23, and the anode 22 has a rotating shaft 24 fixed at the center thereof, and two sets of bearings 26, 27 in which the rotating shaft 24 is fixed to a lead screw 25. It is pivotally supported via a shaft. Further, the lead screw 25 is provided in the tube container 23 so as to be slidable in the direction of the rotation axis of the anode 22. Seals are provided between the bearings 26 and 27 and the rotary shaft 24 and between the lead screw 25 and the tube container 23 in order to maintain the vacuum state of the tube container 23. The rotating shaft 24 fixed to the anode 22 constitutes an induction motor together with the coil 28 and rotates.

  The anode 22 is formed in a disk shape from a metal material, and its periphery is inclined at a predetermined angle. The inclined inclined surface is irradiated with the electron beam output from the cathode 21, and a part of the energy generated by the electron beam irradiation is emitted as X-rays.

  Part of the X-rays radiated from the anode 22 passes through the first transmission part 23-1 formed in a part of the tube container 23 and passes through the collimator (slit) (not shown) to the subject 12. Irradiated. Further, another part of the X-rays radiated from the anode 22 passes through the second transmission part 23-2 formed in the other part of the tube container 23 and is irradiated to the pinhole 29, X-rays that have passed through the pinhole 29 are detected by the 2ch X-ray detector 30.

  The pinhole 29 and the 2ch X-ray detector 30 are fixed to the X-ray tube 11. If the ratio of the detection values in the two channels of the 2ch X-ray detector 30 is calculated, the X-ray emission position can be obtained.

  The lead screw 25 is provided with a nut 31 that is rotatable with respect to the X-ray tube 11 and that is fixed in the rotation axis direction of the anode 22. A motor 32 is connected to the nut 31, and the nut 31 is rotated by a desired angle by controlling the rotation of the motor 32. When the nut 31 rotates by a desired angle, the lead screw 25 moves in the direction of the rotation axis of the anode 22 by a length corresponding to the angle. That is, the anode 22 moves in the rotation axis direction.

  FIG. 3 is a block diagram showing a functional configuration of the X-ray tube control apparatus incorporated in the X-ray diagnostic apparatus.

  The anode position detecting means 41 detects the magnitude of expansion of the anode 22, and in the first embodiment, comprises the pinhole 29 and the 2ch X-ray detector 30.

  The anode position determination means 42 obtains the surface position of the anode 22 from the detection value obtained by the anode position detection means 41. In the first embodiment, the surface position of the anode 22 is calculated from the ratio of detection values obtained by the two channels of the 2ch X-ray detector 30.

  The surface position of the anode 22 obtained by the anode position determining means 42 is supplied to a correction value calculating means 43 and a period variation detecting means 44.

  The correction value calculation means 43 compares the reference value of the surface position of the anode 22 set by the reference value setting means 45 with the surface position of the anode 22 supplied from the anode position determination means 42 and compares the difference. And a correction value is calculated from the obtained difference. The calculated correction value is supplied to the anode position adjusting means 46. The anode position adjusting means 46 moves the anode 22 so that the difference between the reference value of the surface position and the detected surface position is zero based on the supplied correction value. That is, in the first embodiment, the motor 32 is controlled to rotate the nut 31 at an angle corresponding to the difference, and the lead screw 25 is moved in the direction of the rotation axis of the anode 22.

  The periodic fluctuation detecting unit 44 detects a periodic fluctuation of the surface position of the anode 22 supplied from the anode position determining unit 42. If the periodic fluctuation of the surface position of the anode 22 is not detected by the periodic fluctuation detection means 44, it is determined that the anode 22 is not rotating, and the abnormality treatment means 47 causes the X-ray irradiation stop or warning. Etc. are output.

  In the first embodiment having such a configuration, the anode 22 is rotated by an induction motor composed of a coil 28, and an electron beam output from the cathode 21 is irradiated onto the slope of the anode 22. Then, X-rays are emitted and heat is generated. X-rays are irradiated to the subject 12 through a collimator, and heat expands the anode 22 to change its surface position.

  The surface position of the anode 22 is detected by an anode position detection means 41 including a pinhole 29 and a 2ch X-ray detector 30, and the anode position determination means 42 takes a ratio of detection values of two channels of the 2ch X-ray detector 30. Thus, the surface position of the anode 22 is obtained.

  The correction value calculation means 43 calculates the difference between the surface position obtained by the anode position determination means 42 and the reference position set by the reference value setting means 45, and the correction value is calculated from this difference. Based on this correction value, the anode position adjusting means 46 controls the motor 32 to move the position of the anode 22 via the nut 31 and the lead screw 25, and the surface position is maintained at a preset reference position. The

  Therefore, even if the anode 22 expands, the lead screw 25 moves in the direction to cancel out the expansion, and the surface position of the anode 22, that is, the position where the electron beam is irradiated and the position where the X-ray is emitted are set in advance. Maintained at the reference position.

  Further, the surface of the anode 22 has some irregularities due to manufacturing limitations and the degree of perpendicularity in the connection between the anode 22 and the rotating shaft 24. In detecting the surface position of the rotating anode 22, the surface position Fluctuates periodically.

  Therefore, in the detection of the surface position, if periodic fluctuation is detected, it can be determined that the anode 22 is rotating. If periodic fluctuation cannot be detected (if fluctuation cannot be detected), the anode 22 stops rotating. Can be judged. Even if the anode 22 is stopped rotating, if the electron beam is emitted from the cathode 21 and X-rays are emitted, the anode 22 may be melted.

  A periodic fluctuation of the surface position obtained by the anode position determining means 42 is detected by a periodic fluctuation detecting means 44. When the periodic fluctuation is not detected by the periodic fluctuation detection unit 44, the abnormality treatment unit 47 stops the output of the electron beam from the cathode 21 and outputs a warning or the like.

  As described above, according to the first embodiment, the pinhole 29 and the 2ch X-ray detector 30 as the anode position detecting means 41 for detecting the surface position of the anode 22 and the detection value of the 2ch X-ray detector 30 are used to detect the anode 22. Anode position determination means 42 for obtaining the surface position, correction value calculation means 43 for calculating a correction value from the difference between the surface position from the anode position determination means 42 and the reference position, and the correction calculated by the correction value calculation means An anode position adjusting means 46 for moving the anode 22 based on the value and maintaining its surface position at the reference position, a periodic fluctuation detecting means 44 for detecting periodic fluctuations in the surface position from the anode position determining means 42, and this By providing abnormality treatment means 47 for stopping the output of the electron beam from the cathode 21 and outputting a warning when no periodic fluctuation is detected by the periodic fluctuation detection means 44, Since the surface position of the anode 22 of the X-ray tube 11 can always be maintained at the reference position, the X-ray irradiation position can be prevented from shifting due to the thermal expansion of the anode 22.

  Further, the periodic fluctuation of the surface position of the anode 22 obtained from the anode position detecting means 41 via the anode position determining means 42 is detected by the periodic fluctuation detecting means 44 to monitor the rotation of the anode 22. When the periodic fluctuation is not detected, the output of the electron beam from the cathode 21 can be automatically stopped by the abnormality treatment means 47, so that melting due to poor rotation of the anode 22 can be prevented. it can.

  Hereinafter, the second to fifth embodiments are different from the first embodiment described above in the configuration of the anode position detection means 41. In the first embodiment, the pinhole 29 and the 2ch X-ray detector 30 are different. Examples are shown, but other examples are shown below. Therefore, the configuration other than the anode position detecting means 41 is almost the same as that of the first embodiment, and the same members are denoted by the same reference numerals and the description thereof is omitted.

A second embodiment of the present invention will be described with reference to FIG. This second embodiment uses a laser reflection distance meter.
FIG. 4 is a cross-sectional view showing the configuration of the X-ray tube 11. The tube container 23 is formed with a laser transmitting portion 51 through which a laser passes, and the laser light emitting portion 52 irradiates the anode 22 with a predetermined irradiation angle through the laser transmitting portion 51. The reflected laser beam from the anode 22 is transmitted again through the laser transmitting portion 51 and detected by the photodetector 53. The photodetector 53 is configured by arranging a plurality of photoelectric conversion elements in a row, and is a position detection type in which a light detection position is known.

  The laser emission unit 52 and the photodetector 53 are fixed to the X-ray tube 11 and constitute anode position detection means 41. The anode position determination means 42 obtains the surface position of the anode 22 based on the position information supplied from the photodetector 53.

In particular, when the photodetector 53 has two channels, the surface position of the anode can be obtained from the ratio of these two channels.
For example, if the data obtained from each channel is Da and Db, the surface position of the anode 22 can be obtained based on {Da / (Da + Db)}, and the correction amount at that time uses a constant k.
k [(1/2)-{Da / (Da + Db)}]
Is calculated as
Further, the surface position of the anode 22 is obtained based on {(Da−Db) / (Da + Db)}, and the correction amount at that time uses a constant k,
k {(Da-Db) / (Da + Db)}
Is calculated as
As described above, according to the second embodiment, the same effects as those of the first embodiment described above can be obtained.

A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, a laser interferometer is used.
FIG. 5 is a cross-sectional view showing the configuration of the X-ray tube 11. The tube container 23 is formed with a laser transmitting portion 61 through which a laser passes, and the laser light emitting portion 62 irradiates the laser to a half mirror 63 inclined at a predetermined angle with respect to the irradiation direction. The laser is split into two by this half mirror 63, one of which is reflected as reference light and irradiates the reference light mirror 64 substantially vertically. The other is transmitted as the measurement light through the half mirror 63, through the laser transmission section 61, and irradiates the anode 22 substantially vertically.

  The reflected light of the reference light from the reference light mirror 64 passes through the almost same optical path, passes through the half mirror 63, and irradiates the laser light detector 65. Further, the reflected light of the measurement light from the anode 22 passes through almost the same optical path, passes through the laser transmitting portion 61 again, is reflected by the half mirror 63, and is sent to the laser light detector 65. Irradiate.

The measurement light from the reference light mirror 64 and the reference light from the anode 22 are overlapped by the half mirror 63. At this time, since the distance between the half mirror 63 and the reference light mirror 64 is fixed, interference (light) is reflected between the reflected light according to the distance from the half mirror 63 to the surface of the anode 22. Interference) due to the phase of the signal.
The distance from the half mirror 63 to the surface of the anode 22 can be obtained from this interference (beat of reference light and measurement light).

The laser light emitting unit 62, the half mirror 63, the reference light mirror 64, and the laser light detector 65 are fixed to the X-ray tube 11 and constitute anode position detection means 41. The anode position determination means 42 obtains the surface position of the anode 22 from the reference light obtained from the laser light detector 65 and the beat of the measurement light (change in light due to interference).
As described above, according to the third embodiment, the same effect as that of the first embodiment described above can be obtained.

A fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment uses a capacitance.
FIG. 6 is a cross-sectional view showing the configuration of the X-ray tube 11. An extraction shaft 72 of an electrode 71 is fixed to the tube container 23 so as to face the vicinity of the anode 22 (interval so that it does not come into contact even when the anode expands). The fixed portion is filled with a sealing member 73 made of an insulating material, and the degree of vacuum inside the tube container 23 is maintained.

  The lead screw 25 is connected to an electrode wire 74 for applying a voltage between the electrode 71 and the anode 22, and the electrode 71 and the electrode wire 74 are connected to a power source (not shown). Yes. Accordingly, charges are accumulated when a certain voltage is applied between the electrode 71 and the anode 22, and the electrostatic capacity is inversely proportional to the distance between the electrode 71 and the anode 22.

The electrode 71, the extraction shaft 72, and the electrode wire 74 constitute the anode position detection means 41. The anode position determining means 42 calculates the distance between the electrode 71 and the anode 22 from the capacitance value obtained from the electrode 71 and the electrode wire 74 to obtain the surface position of the anode 22.
As described above, according to the fourth embodiment, the same effects as those of the first embodiment described above can be obtained.

A fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment uses an electromagnetic action.
FIG. 7 is a cross-sectional view showing the configuration of the X-ray tube 11. The tube vessel 23 has an opening through which a lead wire 83 for supplying electric power from the AC power source 82 to a coil (electromagnet) 81 provided in the vicinity of the anode 22 (at an interval at which the anode does not contact even when expanded). Is formed. The opening is filled with a sealing member 84 made of an insulating material, and the degree of vacuum inside the tube container 23 is maintained.

  Further, the tube vessel 23 has an opening through which a signal line 86 for supplying electric power to a hall element 85 provided in a location near the anode 22 and away from the coil 81 and for taking out a detection signal is passed. Is formed. The opening is filled with a sealing member 87 made of an insulating material, and the degree of vacuum inside the tube container 23 is maintained. Although the Hall element 85 is used in the fifth embodiment, any sensor sensitive to magnetism can be used.

  The coil 81, the AC power supply 82, the lead wire 83, the Hall element 85, and the signal line 86 constitute an anode position detection means 41. The anode position determination means 42 sends a detection signal (voltage value) from the Hall element 85 (via a magnetic value) between the Hall element 85 and the anode 22 or the coil 81 and the anode 22. The surface position of the anode 22 is obtained by calculating the distance between the two.

  There are three methods for installing the coil 81 and the hall element 85. That is, in the first method, the coil 81 and the hall element 85 are both fixed to the tube vessel 23 and the coil 81 and the anode 22 are expanded as the anode 22 expands. And the distance between the Hall element 85 and the anode 22 are both shortened.

  In the second method, the coil 81 is provided fixed to the surface of the anode 22 and the hall element 85 is provided fixed to the tube vessel 23, so that the anode 22 expands. Accordingly, the distance between the Hall element 85 and the anode 22 is shortened, but the distance between the coil 81 and the anode 22 is kept constant.

In the third method, the coil 81 is fixed to the tube vessel 23, and the Hall element 85 is fixed to the surface of the anode 22, so that the anode 22 expands. Accordingly, the distance between the coil 81 and the anode 22 is shortened, but the distance between the Hall element 85 and the anode 22 is kept constant.
As described above, according to the fifth embodiment, the same effect as that of the first embodiment described above can be obtained.

  A sixth embodiment of the present invention will be described with reference to FIG. In the first to fifth embodiments described above, the anode position adjusting means 46 adjusts the surface position of the anode 22 by moving only the anode 22, but in this sixth embodiment, X The entire position of the anode tube is adjusted by moving the entire tube. In the sixth embodiment, except for the difference in the configuration of the anode position adjusting means 46, the configuration is almost the same as that of the fourth embodiment. Description is omitted.

  FIG. 8 is a cross-sectional view showing the configuration of the X-ray tube 11. The X-ray tube 11 is configured by housing a cathode 21 and an anode 22 in a vacuum tube container 91. A rotating shaft 24 fixed to the center of the anode 22 is rotatably supported via two sets of bearings 26 and 27 fixed to the tube container 91. The rotating shaft 24 fixed to the anode 22 constitutes an induction motor together with the coil 28 and rotates.

  When the electron beam output from the cathode 21 is irradiated, the X-rays radiated from the anode 22 pass through a transmission part 91-1 formed in a part of the tube container 91 and are not shown. The subject is irradiated via

  An extraction shaft 72 of an electrode 71 provided opposite to the vicinity of the anode 22 is fixed to the tube container 91. The fixed portion is filled with a sealing member 73 made of an insulating material, and the degree of vacuum inside the tube container 23 is maintained. On the other hand, the rotating shaft 24 fixed to the anode 22 has an electrode wire 74 connected to a carbon electrode 93 that is always crimped by a spring 92, and the electrode 71 and the electrode wire 74 are connected to a power source (not shown). Has been.

  The tube container 91 is fixed on a movable portion 95 of a linear bearing 94 provided in the rotation axis direction of the anode 22, and the X-ray tube 11 is slidable in the rotation axis direction of the anode 22. . Further, a lead screw 96 is fixed to the tube container 91, and a rotatable nut 97 fixed in the direction of the rotation axis of the anode 22 is provided on the lead screw 96. A motor 98 is connected to the nut 97, and the nut 97 is rotated by a desired angle by controlling the rotation of the motor 98. When the nut 97 rotates by a desired angle, the lead screw 96 moves in the direction of the rotation axis of the anode 22 by a length corresponding to the angle. That is, the X-ray tube 11, and thus the anode 22, moves in the direction of the rotation axis.

  The linear bearing 94 is not provided in the transmission part 91-1 and its peripheral part so as not to block the X-rays that are transmitted through the transmission part 91-1 and irradiated to the subject.

  In the sixth embodiment having such a configuration, the surface position of the anode 22 is detected by the anode position detection means 41 including the electrode 71, the lead shaft 72, and the electrode wire 74, and the anode position determination means 42 includes the electrode 71 and From the capacitance value obtained from the electrode wire 74, the distance between the electrode 71 and the anode 22 is calculated to determine the surface position of the anode 22.

  The correction value calculation means 43 calculates the difference between the surface position obtained by the anode position determination means 42 and the reference position set by the reference value setting means 45, and the correction value is calculated from this difference. Based on this correction value, the anode position adjusting means 46 controls the motor 98 so that the X-ray tube 11 moves on the linear bearing via the nut 97 and the lead screw 96. Therefore, the surface position of the anode 22 is determined in advance. The set reference position is maintained.

  Therefore, even if the anode 22 expands, the lead screw 25 moves in the direction to cancel out the expansion, and the surface position of the anode 22, that is, the position where the electron beam is irradiated and the position where the X-ray is emitted are set in advance. Maintained at the reference position.

  Thus, according to the sixth embodiment, the same effect as that of the first embodiment can be obtained. In addition, since the lead screw 96, the nut 97, and the motor 98 can be provided outside the X-ray tube 11, an effect that it can be attached to an existing X-ray tube can be obtained.

  In the first to sixth embodiments described above, the anode position adjusting means 46 has been described as an example of a linear drive mechanism including a lead screw, a nut, and a motor. However, the present invention is not limited to this. Alternatively, other linear drive mechanisms such as a linear drive mechanism including a rack and pinion and a motor, and a linear motor can be applied.

The figure which shows the principal part structure of the outline of the X-ray diagnostic apparatus incorporating the X-ray tube control apparatus of 1st Example of this invention. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of the Example. The block diagram which shows the function structure of the X-ray tube control apparatus of the Example. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of 2nd Example. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of 3rd Example. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of 4th Example. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of 5th Example. Sectional drawing which shows the structure of the X-ray tube of the X-ray tube control apparatus of 6th Example. Sectional drawing which shows the structure of the X-ray tube of the conventional X-ray tube control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... X-ray tube, 21 ... Cathode, 22 ... Anode, 23 ... Tube container, 24 ... Rotary shaft, 26, 27 ... Bearing, 28 ... Coil, 41 ... Anode position detection means, 42 ... Anode position determination means, 43 ... Correction value calculation means 44 ... periodic fluctuation detection means 45 ... reference value setting means 46 ... anode position adjustment means 47 ... abnormality treatment means 71 ... electrode 72 ... lead shaft 73 ... seal member 74 ... electrode wire 91 ... Tube container, 91-1 ... Transmission part, 92 ... Spring, 93 ... Carbon electrode, 94 ... Linear bearing, 95 ... Movable part, 96 ... Lead screw, 97 ... Nut, 98 ... Motor.

Claims (1)

It is generated by irradiating the inclined surface of the anode as a target with an electron beam output from the cathode, comprising a cathode and an anode having a disk shape and an inclined surface around which is rotatably supported by a tube vessel. In the X-ray tube control device for controlling the X-ray tube that irradiates the outside of the tube container
Surface position measuring means for measuring the surface position of the anode;
And a means for adjusting the position of the anode in the rotation axis direction by moving the tube container in the rotation axis direction of the anode based on the surface position measured by the surface position measuring means. X-ray control apparatus characterized by this.

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