JP2014204875A - X-ray shutter and x-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray shutter capable of improving switching speed between exposure of a first X-ray and exposure of a second X-ray, and an X-ray tube device including the X-ray shutter.SOLUTION: An X-ray shutter includes: an X-ray iris member 4; and a first X-ray shield plate 5. The X-ray iris member 4 has: a first X-ray transmission section 4a through which a first X-ray is transmitted; and a second X-ray transmission section 4b through which a second X-ray is transmitted. The first X-ray shield plate 5: is disposed facing the first X-ray transmission section 4a and the second X-ray transmission section 4b; is formed of an X-ray shield material; has an X-ray transmission window 5a; and is repeatedly switched to a first state, second state, third state, and fourth state by being rotated.

Description

  Embodiments described herein relate generally to an X-ray shutter and an X-ray tube apparatus.

  The X-ray tube apparatus includes an X-ray tube. The X-ray tube is configured to generate an X-ray by colliding an electron beam with an anode target. Such an X-ray tube apparatus is used in many applications such as a medical diagnostic apparatus, an industrial nondestructive inspection apparatus, and a material analysis apparatus.

As an X-ray tube apparatus, an X-ray tube apparatus capable of intermittently exposing X-rays is required.
By the way, X-rays can be obtained by applying a high voltage to the X-ray tube. However, the operation of the X-ray tube becomes unstable for a few seconds after rising. For this reason, when a high voltage is applied to the X-ray tube every time X-ray irradiation is performed, it takes time for diagnosis, inspection, analysis, and the like. Therefore, once a high voltage is applied to the X-ray tube, the application of the high voltage to the X-ray tube is continued (held). Therefore, once a high voltage is applied to the X-ray tube, X-rays are continuously emitted from the X-ray tube.

  Therefore, an X-ray tube device in which an X-ray tube and an X-ray shutter plate are combined is known. By using the X-ray tube device, X-rays can be intermittently exposed by reciprocating the X-ray shutter plate in a state where X-rays are continuously emitted from the X-ray tube.

JP 2007-101259 A Japanese Patent No. 4169828 Japanese Patent Laid-Open No. 3-1845

In recent years, a technique for capturing a moving image using an X-ray tube apparatus has been developed.
In particular, a technique for photographing a three-dimensional moving image using an X-ray tube apparatus has been developed. In this case, the X-ray tube apparatus can take a three-dimensional moving image by exposing X-rays from two places spaced from each other. Therefore, for example, it is conceivable to use both a technique for reciprocating the X-ray shutter plate and a technique for exposing X-rays from two focal points spaced from each other.

  By reciprocating the X-ray shutter plate, it is possible to switch alternately between a first imaging state in which an image for the right eye is captured and a second imaging state in which an image for the left eye is captured. In the first imaging state, the X-ray shutter plate in the first imaging state transmits the first X-rays emitted from the first focal point and shields the second X-rays emitted from the second focal point. The X-ray shutter plate in the second imaging state shields the first X-ray and transmits the second X-ray.

However, in the configuration in which the X-ray shutter plate is reciprocated, switching between the first X-ray exposure and the second X-ray exposure is delayed. For example, the following problems occur.
(1) When the detection operation of the X-ray detector is synchronized with the switching operation between the first imaging state and the second imaging state, a smooth moving image cannot be obtained, and the displayed moving image is a frame It will be in the feed state.

(2) When the subject (subject) being photographed is not in a stationary state, the subject state is shifted between the first photographing state and the second photographing state, and an abnormality such as blurring occurs in the moving image. End up.
(3) When the detection operation of the X-ray detector is performed at a detection speed necessary for obtaining a smooth moving image, it becomes difficult to obtain a moving image, and the contrast of the captured image (moving image) is lowered. . This is because the X-ray shutter plate is radiated from the first focus during the first detection for detecting the right-eye image by the X-ray detector and for the second detection for detecting the left-eye image. This is because both the X-ray and the X-ray emitted from the second focal point can be transmitted.

  The present invention has been made in view of the above points, and an object thereof is to provide an X-ray shutter and an X-ray shutter capable of improving the switching speed between the first X-ray exposure and the second X-ray exposure. Another object of the present invention is to provide an X-ray tube apparatus.

An X-ray shutter according to an embodiment
A first X-ray transmitting part that is formed of an X-ray shielding material and transmits the first X-rays emitted from the first position, and transmits the second X-rays emitted from the second position spaced from the first position. An X-ray shielding member having a second X-ray transmission part;
The first X-ray transmission part and the second X-ray transmission part are arranged opposite to each other, formed of an X-ray shielding material, and having an X-ray transmission window that transmits the first X-ray and the second X-ray, A first state in which an X-ray transmission window faces the first X-ray transmission portion, transmits the first X-ray, shields the second X-ray, and exposes the first X-ray; and the X-ray transmission window is the first X-ray A second state in which the first X-ray and the second X-ray are separated from the X-ray transmission unit and the second X-ray transmission unit, and the X-ray transmission window is opposed to the second X-ray transmission unit and transmits the second X-ray. A third state in which the first X-ray is shielded and the second X-ray is exposed, and the X-ray transmissive window is separated from the first X-ray transmissive portion and the second X-ray transmissive portion to shield the first X-ray and the second X-ray. An X-ray shielding plate that is repeatedly switched to the fourth state;
Is provided.

An X-ray shutter according to an embodiment is
A first X-ray transmitting part that is formed of an X-ray shielding material and transmits the first X-rays emitted from the first position, and transmits the second X-rays emitted from the second position spaced from the first position. An X-ray shielding member having a second X-ray transmission part;
A first X-ray shielding plate disposed opposite to the first X-ray transmission portion, formed of an X-ray shielding material, and having a first X-ray transmission window that transmits the first X-ray;
A second X-ray shielding plate disposed opposite to the second X-ray transmission part, formed of an X-ray shielding material, and having a second X-ray transmission window that transmits the second X-ray,
The first X-ray shielding plate and the second X-ray shielding plate rotate, respectively, so that the first X-ray transmission window faces the first X-ray transmission portion and transmits the first X-ray, and the second X-ray transmission window A first state in which the second X-ray is removed from the second X-ray transmission part, the second X-ray is shielded and the first X-ray is exposed, and the first X-ray transmission window is removed from the first X-ray transmission part to remove the first X-ray. A second state in which the second X-ray transmission window is shielded and shielded from the second X-ray transmission part and the second X-ray transmission part is shielded; and the first X-ray transmission window is detached from the first X-ray transmission part and the first X-ray transmission part. A third state in which the second X-ray transmission window is opposed to the second X-ray transmission portion and transmits the second X-ray to expose the second X-ray, and the first X-ray transmission window is the first X-ray. The second X-ray transmission window shields the first X-ray out of the transmission part and the second X-ray transmission window transmits the second X-ray transmission. A fourth state for blocking said first 2X line deviates from, the repeated switching.

An X-ray tube device according to an embodiment
A target on which a first focus and a second focus are formed spaced apart from each other;
A first X-ray transmission portion that is disposed opposite to the first focus and the second focus, is formed of an X-ray shielding material, and transmits the first X-ray radiated from the first focus, and is spaced from the first X-ray transmission portion An X-ray shielding member having a second X-ray transmitting portion that is formed with a second X-ray transmitted therethrough and transmits the second X-ray emitted from the second focal point;
The first X-ray transmission part and the second X-ray transmission part are arranged opposite to each other, formed of an X-ray shielding material, and having an X-ray transmission window that transmits the first X-ray and the second X-ray, A first state in which an X-ray transmission window faces the first X-ray transmission portion, transmits the first X-ray, shields the second X-ray, and exposes the first X-ray; and the X-ray transmission window is the first X-ray A second state in which the first X-ray and the second X-ray are separated from the X-ray transmission unit and the second X-ray transmission unit, and the X-ray transmission window is opposed to the second X-ray transmission unit and transmits the second X-ray. A third state in which the first X-ray is shielded and the second X-ray is exposed, and the X-ray transmissive window is separated from the first X-ray transmissive portion and the second X-ray transmissive portion to shield the first X-ray and the second X-ray. An X-ray shielding plate that is repeatedly switched to the fourth state;
Is provided.

An X-ray tube device according to an embodiment
A target on which a first focus and a second focus are formed spaced apart from each other;
A first X-ray transmission portion that is disposed opposite to the first focus and the second focus, is formed of an X-ray shielding material, and transmits the first X-ray radiated from the first focus, and is spaced from the first X-ray transmission portion An X-ray shielding member having a second X-ray transmitting portion that is formed with a second X-ray transmitted therethrough and transmits the second X-ray emitted from the second focal point;
A first X-ray shielding plate disposed opposite to the first X-ray transmission portion, formed of an X-ray shielding material, and having a first X-ray transmission window that transmits the first X-ray;
A second X-ray shielding plate disposed opposite to the second X-ray transmission part, formed of an X-ray shielding material, and having a second X-ray transmission window that transmits the second X-ray,
The first X-ray shielding plate and the second X-ray shielding plate rotate, respectively, so that the first X-ray transmission window faces the first X-ray transmission portion and transmits the first X-ray, and the second X-ray transmission window A first state in which the second X-ray is removed from the second X-ray transmission part, the second X-ray is shielded and the first X-ray is exposed, and the first X-ray transmission window is removed from the first X-ray transmission part to remove the first X-ray. A second state in which the second X-ray transmission window is shielded and shielded from the second X-ray transmission part and the second X-ray transmission part is shielded; and the first X-ray transmission window is detached from the first X-ray transmission part and the first X-ray transmission part. A third state in which the second X-ray transmission window is opposed to the second X-ray transmission portion and transmits the second X-ray to expose the second X-ray, and the first X-ray transmission window is the first X-ray. The second X-ray transmission window shields the first X-ray out of the transmission part and the second X-ray transmission window transmits the second X-ray transmission. A fourth state for blocking said first 2X line deviates from, the repeated switching.

FIG. 1 is a view showing the X-ray tube apparatus according to the first embodiment, and is a view of the X-ray tube apparatus viewed from above the anode target in a direction along the tube axis. FIG. 2 is a schematic view showing the X-ray tube and the stator coil shown in FIG. FIG. 3 is an enlarged cross-sectional view showing the cathode shown in FIG. FIG. 4 is an enlarged plan view of the cathode shown in FIGS. 2 and 3 as viewed from the anode target side. FIG. 5 is an enlarged front view schematically showing the first X-ray shielding plate shown in FIG. FIG. 6 is an enlarged front view schematically showing the second X-ray shielding plate shown in FIG. FIG. 7 is a diagram showing timing when the X-ray tube apparatus according to the first embodiment exposes the first X-ray and the second X-ray. FIG. 8 is a view showing the X-ray tube apparatus according to the second embodiment, and is an enlarged front view schematically showing the first X-ray shielding plate and the second X-ray shielding plate taken out.

  Hereinafter, the X-ray tube apparatus according to the first embodiment will be described in detail with reference to the drawings. For example, the X-ray tube apparatus can form an X-ray stereo imaging system together with an X-ray flat panel detector or the like. In addition, the X-ray tube apparatus can form an X-ray stereo cine imaging system together with an X-ray image intensifier or the like.

  As shown in FIGS. 1 and 2, the X-ray tube apparatus includes a rotary anode type X-ray tube 1, a stator coil 2 as a coil for generating a magnetic field, and an X-ray shutter 3. Although not shown, the X-ray tube device includes a first encoder as an encoder, a second encoder as another encoder, a first control motor as a control motor, a second control motor as another control motor, Is further provided.

The X-ray tube 1 includes a cathode (cathode electron gun) 10, a sliding bearing unit 20, an anode target 60, and a vacuum envelope 70.
As shown in FIGS. 1, 2, 3 and 4, the cathode 10 has a first filament 11 as a first electron emission source and a second filament 12 as a second electron emission source. A relatively negative voltage and current are applied to the first filament 11 and the second filament 12. Thereby, the first filament 11 and the second filament 12 emit electrons (thermoelectrons).

  The cathode 10 also has a focusing electrode (not shown). The focusing electrode is provided on each of the first filament 11 and the second filament 12, and converges electrons emitted from the first filament and the second filament. For this reason, the cathode 10 can converge and emit electrons.

  As described above, in this embodiment, two filaments (electron emission sources) of the first filament 11 and the second filament 12 are used and driven simultaneously, so that the anode target 60 has the first focus F1 and the second focus. Two focal points of F2 can be formed simultaneously.

  The first filament 11 forms a first focal point F1, and the second filament 12 forms a second focal point F2. The 1st filament 11 and the 2nd filament 12 are formed similarly, and the kind and characteristic are the same. The same voltage and current are applied to the first filament 11 and the second filament 12. Thereby, the amount of electron emission of the first filament 11 and the second filament 12 becomes the same. Further, the size of the first focal point F1 formed by the first filament 11 and the size of the second focal point F2 formed by the second filament 12 are the same.

  As shown in FIG. 2, the slide bearing unit 20 includes a rotating body 30, a fixed shaft 40, and a metal lubricant (not shown) as a lubricant, and uses a slide bearing.

  The rotating body 30 is formed in a cylindrical shape, and one end thereof is closed. The rotating body 30 extends along a rotation axis that is a central axis of the rotating operation of the rotating body. In this embodiment, the rotation axis is the same as the tube axis a1 of the X-ray tube 1, and will be described as a tube axis a1 below. The rotating body 30 is rotatable around the tube axis a1. The rotating body 30 has a connecting portion 31 located at one end thereof. The rotating body 30 is made of a material such as Fe (iron) or Mo (molybdenum).

  The fixed shaft 40 is formed in a cylindrical shape having a smaller size than the rotating body 30. The fixed shaft 40 is provided coaxially with the rotating body 30 and extends along the tube axis a1. The fixed shaft 40 is fitted inside the rotating body 30. The fixed shaft 40 is made of a material such as Fe or Mo. One end of the fixed shaft 40 is exposed to the outside of the rotating body 30. The fixed shaft 40 supports the rotating body 30 in a rotatable manner.

The metal lubricant is filled in the gap between the rotating body 30 and the fixed shaft 40.
As shown in FIGS. 1 and 2, the anode target (target) 60 is disposed opposite to the other end portion of the fixed shaft 40 in the direction along the tube axis a <b> 1. The anode target 60 includes an anode 61 and a target layer 62 provided on a part of the outer surface of the anode.

The anode 61 is fixed to the rotating body 30 via the connection portion 31. The anode 61 has a disc shape and is made of a material such as Mo. The anode 61 is rotatable about the tube axis a1. The target layer 62 has a target surface S that is disposed so as to face the cathode 10 in a direction along the tube axis a <b> 1 with a space.
A relatively positive voltage is applied to the anode target 60 via the fixed shaft 40 and the rotating body 30. A first focal point F1 and a second focal point F2 are formed on the target surface S at an interval from each other. The distance between the first focus F1 and the second focus F2 is substantially the same as the distance between the human right eye and left eye. For example, the first focal point F1 emits a first X-ray used for photographing a right eye image (moving image), and the second focal point F2 emits a second X-ray used for photographing a left eye image (moving image). To do.

  The vacuum envelope 70 is formed in a substantially cylindrical shape. The vacuum envelope 70 is formed of a combination of an insulating material such as glass and ceramic, or a metal. In the vacuum envelope 70, the diameter of the part facing the anode target 60 is larger than the diameter of the part facing the rotating body 30. The vacuum envelope 70 has an opening 71. The opening 71 is in close contact with one end of the fixed shaft 40 so as to maintain the sealed state of the vacuum envelope 70. The vacuum envelope 70 fixes the fixed shaft 40. The vacuum envelope 70 has the cathode 10 attached to the inner wall. The vacuum envelope 70 is hermetically sealed and contains the cathode 10, the sliding bearing unit 20, the anode target 60, and the like. The inside of the vacuum envelope 70 is maintained in a vacuum state.

  As shown in FIG. 2, the stator coil 2 is provided so as to face the side surface of the rotating body 30 and surround the outside of the vacuum envelope 70.

  As shown in FIGS. 1, 5 and 6, the X-ray shutter 3 includes an X-ray diaphragm member 4 as an X-ray shielding member, a first X-ray shielding plate 5 as an X-ray shielding plate, and other X-rays. And a second X-ray shielding plate 6 as a shielding plate. The first X-ray shielding plate 5 is for focus switching, and the second X-ray shielding plate 6 is for frame rate control. The X-ray shutter 3 also functions as a collimator.

  The relative position with respect to the X-ray tube 1 is fixed, and the X-ray diaphragm member 4 is used in a stationary state. The X-ray diaphragm member 4 is disposed to face the first focus F1 and the second focus F2. The X-ray diaphragm member 4 is formed of an X-ray shielding material. For example, the X-ray diaphragm member 4 can be formed of a material containing lead or a lead alloy, or can be formed of a material in which lead is attached to the X-ray transmitting member.

  The X-ray diaphragm member 4 has a first X-ray transmission part 4a and a second X-ray transmission part 4b. The first X-ray transmission part 4a and the second X-ray transmission part 4b are formed by through holes formed in the X-ray diaphragm member 4 at intervals from each other. Here, the first X-ray transmission part 4a and the second X-ray transmission part 4b have the same size and are circular. The first X-ray transmission unit 4a is opposed to the first focal point F1 and transmits the first X-rays emitted from the first focal point F1 (first position). The second X-ray transmission unit 4b faces the second focal point F2 and transmits the second X-rays emitted from the second focal point F2 (second position).

  From the above, the X-ray aperture member 4 extracts the first X-ray bundle R1 by narrowing down the first X-ray emitted from the first focal point F1, and narrows down the second X-ray emitted from the second focal point F2. Remove R2.

  The first X-ray shielding plate 5 is disposed to face the first X-ray transmission part 4a and the second X-ray transmission part 4b. In this embodiment, the first X-ray shielding plate 5 is located on the opposite side of the X-ray tube 1 with respect to the X-ray diaphragm member 4. The first X-ray shielding plate 5 is made of an X-ray shielding material.

  The first X-ray shielding plate 5 has one X-ray transmission window 5a that transmits the first X-ray (first X-ray bundle R1) and the second X-ray (second X-ray bundle R2). Here, the X-ray transmission window 5a is a rectangular opening. The size of the X-ray transmission window 5a is equal to or larger than the sizes of the first X-ray transmission part 4a and the second X-ray transmission part 4b. The X-ray transmission window 5a faces only one of the first X-ray transmission part 4a and the second X-ray transmission part 4b. The X-ray transmissive window 5a faces the first X-ray transmissive part 4a or the second X-ray transmissive part 4b, thereby completely exposing the first X-ray transmissive part 4a or the second X-ray transmissive part 4b.

  The first X-ray shielding plate 5 is formed in a disc shape. The central axis of the first X-ray shielding plate 5 is along the axis a2. The first X-ray shielding plate 5 can rotate around the central axis, and is repeatedly switched between the first state, the second state, the third state, and the fourth state.

In the first state, the X-ray transmission window 5a faces the first X-ray transmission part 4a, and the first X-ray shielding plate 5 transmits the first X-ray and shields the second X-ray to block the first X-ray (first X-ray bundle R1). To be exposed.
In the second state, the X-ray transmission window 5a is detached from the first X-ray transmission part 4a and the second X-ray transmission part 4b, and the first X-ray shielding plate 5 shields the first X-ray and the second X-ray.

In the third state, the X-ray transmission window 5a faces the second X-ray transmission part 4b, and the first X-ray shielding plate 5 transmits the second X-ray and shields the first X-ray to block the second X-ray (second X-ray bundle R2). To be exposed.
In the fourth state, the X-ray transmission window 5a is detached from the first X-ray transmission part 4a and the second X-ray transmission part 4b, and the first X-ray shielding plate 5 shields the first X-ray and the second X-ray.

  The second X-ray shielding plate 6 is disposed opposite to the X-ray diaphragm member 4. In this embodiment, the second X-ray shielding plate 6 is located on the opposite side of the X-ray diaphragm member 4 with respect to the first X-ray shielding plate 5. The second X-ray shielding plate 6 is made of an X-ray shielding material. For example, the second X-ray shielding plate 6 and the first X-ray shielding plate 5 may be formed of an alloy mainly composed of molybdenum or tungsten, or may be formed of a structure steel frame in which lead is pasted. it can. The second X-ray shielding plate 6 is formed in a disc shape.

  The second X-ray shielding plate 6 has an X-ray transmission window 6a as another X-ray transmission window that transmits the first X-ray (first X-ray bundle R1) and the second X-ray (second X-ray bundle R2). Here, the X-ray transmission window 6a is a fan-shaped opening. The X-ray transmission window 6a is a part surrounded by an arc connecting the two radii of the second X-ray shielding plate 6 and its end points. The X-ray transmissive window 6a faces the X-ray transmissive window 5a and the first X-ray transmissive portion 4a to completely expose the first X-ray transmissive portion 4a, and faces the X-ray transmissive window 5a and the second X-ray transmissive portion 4b. By doing so, the second X-ray transmission part 4b is completely exposed.

  The second X-ray shielding plate 6 is provided coaxially with the first X-ray shielding plate 5, and the central axis of the second X-ray shielding plate 6 is along the axis a2. The second X-ray shielding plate 6 can rotate around this central axis.

  As the second X-ray shielding plate 6 rotates, the X-ray transmission window 6a faces the first X-ray transmission part 4a and the second X-ray transmission part 4b. Thereby, during the period when the first X-ray shielding plate 5 is switched to the first state, the second X-ray shielding plate 6 transmits or shields the first X-ray. Further, during the period when the first X-ray shielding plate 5 is switched to the third state, the second X-ray shielding plate 6 transmits or shields the second X-ray.

  The first encoder is a sensor that detects a position, and electronically reads the rotational speed and rotational phase of the first X-ray shielding plate 5. The second encoder is a sensor that detects a position, and electronically reads the rotational speed and rotational phase of the second X-ray shielding plate 6.

  The first control motor controls the rotation operation of the first X-ray shielding plate 5 based on the rotation speed and rotation phase of the first X-ray shielding plate 5 read by the first encoder. The second control motor controls the rotation operation of the second X-ray shielding plate 6 based on the rotation speed and rotation phase of the second X-ray shielding plate 6 read by the second encoder. The first X-ray shielding plate 5 and the second X-ray shielding plate 6 can rotate independently.

  As the first control motor and the second control motor, a motor having a control function such as a synchronous motor, a servo motor, or a stepping motor can be used, and a function for arbitrarily controlling the rotation phase angle can be provided. .

Next, the operation state of the X-ray tube apparatus will be described.
As shown in FIGS. 1 and 2, during operation of the X-ray tube device, the stator coil 2 generates a rotational torque applied to the rotating body 30, so that the rotating body rotates. As a result, the anode target 60 also rotates.

  When the anode target 60 starts rotating, a current is supplied to the first filament 11 and the second filament 12 to drive them simultaneously. A relatively negative voltage and current are applied to the first filament 11 and the second filament 12. A relatively positive voltage is applied to the anode target 60.

  Since an X-ray tube voltage (hereinafter referred to as tube voltage) is applied between the cathode 10 (the first filament 11 and the second filament 12) and the anode target 60, it is emitted from the first filament 11 and the second filament 12. The electrons are converged and accelerated, and collide with the target layer 62. That is, an X-ray tube current (hereinafter referred to as tube current) flows from the cathode 10 to the first focus F1 and the second focus F2 of the target layer 62.

  The target layer 62 emits X-rays when colliding with electrons. Thereby, the first X-ray is emitted from the first focal point F1, and the second X-ray is emitted from the second focal point F2. The X-ray diaphragm member 4 narrows the X-rays radiated from the X-ray tube 1 and takes out the first X-ray (first X-ray bundle R1) and the second X-ray (second X-ray bundle R2).

  Since the 1st control motor can rotate the 1st X-ray shielding board 5 on predetermined conditions, it can control the time interval etc. which switch from the 1st state to the 3rd state. Accordingly, the first X-ray shielding plate 5 can transmit the first X-ray (first X-ray bundle R1) and the second X-ray (second X-ray bundle R2) independently and sequentially at a short time interval.

  Furthermore, in this embodiment, the X-ray tube apparatus includes a second X-ray shielding plate 6. Since the second control motor can rotate the second X-ray shielding plate 6 under a predetermined condition, it is possible to control a time interval for switching from the first state to the next first state. In addition, the second control motor can control the period of the second state and the period of the fourth state to be non-uniform. For example, the period of the fourth state can be made longer than the period of the second state. Since the X-rays can be shielded by adjusting the period of the fourth state by the second X-ray shielding plate 6, the X-ray exposure can be thinned out.

  Next, the relationship between the rotation of the first X-ray shielding plate 5 and the second X-ray shielding plate 6 and the timing of the first and second X-ray exposure will be described with reference to FIG. In FIG. 7, the first state is S1, the second state is S2, the third state is S3, and the fourth state is S4.

  As shown in FIGS. 1 and 7, it is desirable to minimize the length (frame rate) of one frame period T2. This is because the exposure of the subject can be reduced. This is because a smooth moving image can be taken.

  Further, the first state in which the first X-ray is exposed and the third state in which the second X-ray is exposed are completely separated. This is because the first X-ray (right-eye image) and the second X-ray (left-eye image) are made completely independent and detected by an X-ray detector or the like. As a result, a good moving image can be obtained and an image (moving image) excellent in contrast characteristics can be taken.

  Furthermore, the period T1 from the switching to the first state S1 to the switching to the third state S3 is not limited to one frame period T2, but is switched in the minimum period in which the X-ray flat panel detector or the like is always accepted. It is desirable that This is because it is possible to reduce the degree of parallax abnormality such as blurring in the moving image due to the subject state being deviated between the first state S1 and the third state S3.

  Therefore, the above timing can be created by rotating the first X-ray shielding plate 5 at a rotation speed of 1 / T1 per second. Thus, when the X-ray transmission window 5a of the first X-ray shielding plate 5 is rotated to a position facing (for example, coincident with) the first X-ray transmission portion 4a, the first focus F1 is removed. The emitted first X-ray can be exposed and the second X-ray (X-ray outside the first focal point F1) can be shielded.

  The shape and size of the X-ray transmission window 5a can be determined according to the required rotation speed of the first X-ray shielding plate 5 and the maximum exposure pulse time to be used. The shape of the X-ray transmission window 5a may be round, square, or fan-shaped.

  Even when the X-ray shutter 3 is formed without the second X-ray shielding plate 6, the degree of parallax abnormality can be minimized by minimizing the length (frame rate) of one frame period T2. In this case, the exposure of the subject may increase.

  Therefore, in order to control the frame rate, the X-ray shutter 3 includes a second X-ray shielding plate 6 independent of the first X-ray shielding plate 5. In the present embodiment, the shape of the X-ray transmission window 6a of the second X-ray shielding plate 6 is a half-circular fan shape. By rotating the second X-ray shielding plate 6 at a rotation speed of 1 / T2 per second, the period of the fourth state S4 can be made longer than the period of the second state S2, and unnecessary exposure can be thinned out. For example, by controlling the rotational speed of the second X-ray shielding plate 6 to ½ of the rotational speed of the first X-ray shielding plate 5, the X-ray exposure to the subject can be reduced to half.

  According to the X-ray tube apparatus according to the first embodiment configured as described above, the X-ray tube apparatus includes the X-ray tube 1 and the X-ray shutter 3. The X-ray tube 1 includes an anode target 60 on which a first focal point F1 and a second focal point F2 are formed at intervals. The X-ray shutter 3 includes an X-ray diaphragm member 4 and a first X-ray shielding plate 5.

  The X-ray diaphragm member 4 is formed at a distance from the first X-ray transmission part 4a that transmits the first X-rays emitted from the first focal point F1 and the first X-ray transmission part 4a, and is emitted from the second focal point F2. And a second X-ray transmission part 4b that transmits the second X-rays.

  The first X-ray shielding plate 5 has an X-ray transmission window 5a that transmits the first X-ray and the second X-ray. The first X-ray shielding plate 5 is repeatedly switched to the first state S1, the second state S2, the third state S3, and the fourth state S4 by rotating. Since the first X-ray shielding plate 5 itself is configured to rotate, by controlling the rotational speed of the first X-ray shielding plate 5, the period T1 from when switching to the first state S1 to switching to the third state S3 is achieved. Can be easily shortened. Thereby, the X-ray shutter 3 can improve the switching speed between the exposure of the first X-ray (first X-ray bundle R1) and the exposure of the second X-ray (second X-ray bundle R2).

  The X-ray shutter 3 further includes a second X-ray shielding plate 6. The second X-ray shielding plate 6 has an X-ray transmission window 6a. As the second X-ray shielding plate 6 rotates, the X-ray transmission window 6a faces the first X-ray transmission part 4a and the second X-ray transmission part 4b. By controlling the rotation operation of the second X-ray shielding plate 6, the length (frame rate) of one frame period T2 can be controlled. The period of the second state S2 and the period of the fourth state S4 can be controlled to be non-uniform. Since the period of the fourth state S4 can be made longer than the period of the second state S2, unnecessary X-ray exposure can be thinned out.

  Also, since two focal points can be formed on the anode target 60, X-rays can be exposed from two places so that parallax can be obtained with respect to the subject. A right-eye image and a left-eye image can be repeatedly captured alternately, and these images can be digitally reconstructed into a three-dimensional image (moving image).

  For example, when the X-ray tube apparatus is used in a medical X-ray tube apparatus used for angiography, an image (moving image) having a stereoscopic effect can be displayed to the operator. Imaging can be performed at a speed necessary for performing stereo pulse fluoroscopy in which the positional relationship between the blood vessel and the guide wire is observed with a stereoscopic moving image while guiding the catheter. For this reason, follow-up of a catheter etc. becomes easy.

  From the above, it is possible to obtain the X-ray shutter 3 and the X-ray tube apparatus including the X-ray shutter that can improve the switching speed between the first X-ray exposure and the second X-ray exposure. And the X-ray shutter 3 and X-ray tube apparatus which can thin out unnecessary X-ray exposure can be obtained. Further, it is possible to obtain an effect of shielding out-of-focus X-rays leaking from the opening of the other X-ray extraction window while one of the two electron guns is exposed.

  Next, the X-ray tube apparatus according to the second embodiment will be described in detail. In this embodiment, other configurations are the same as those of the first embodiment described above, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 8, the X-ray shutter 3 includes an X-ray diaphragm member 4, a first X-ray shielding plate 7, and a second X-ray shielding plate 8. The first X-ray shielding plate 7 and the second X-ray shielding plate 8 are for focus switching and for frame rate control.

  The first X-ray shielding plate 7 is disposed to face the first X-ray transmission part 4a. In this embodiment, the first X-ray shielding plate 7 is located on the opposite side of the X-ray tube 1 with respect to the X-ray diaphragm member 4. The first X-ray shielding plate 7 is made of an X-ray shielding material. The first X-ray shielding plate 7 is formed in a disc shape. The first X-ray shielding plate 7 is rotatable about the central axis of the first X-ray shielding plate 7.

  The first X-ray shielding plate 7 has an X-ray transmission window 7a as a first X-ray transmission window that transmits the first X-ray (first X-ray bundle R1). Here, the X-ray transmission window 7a is a rectangular opening. The size of the X-ray transmissive window 7a is equal to or larger than the size of the first X-ray transmissive portion 4a. The X-ray transmission window 7a faces only the first X-ray transmission part 4a among the first X-ray transmission part 4a and the second X-ray transmission part 4b. The X-ray transmission window 7a faces the first X-ray transmission part 4a, thereby completely exposing the first X-ray transmission part 4a.

The second X-ray shielding plate 8 is disposed to face the second X-ray transmission part 4b. In this embodiment, the second X-ray shielding plate 8 is located on the opposite side of the X-ray tube 1 with respect to the X-ray diaphragm member 4. The second X-ray shielding plate 8 is made of an X-ray shielding material. For example, the second X-ray shielding plate 8 and the first X-ray shielding plate 7 may be formed of an alloy mainly composed of molybdenum or tungsten, or may be formed of a structure steel frame in which lead is pasted. it can.
The second X-ray shielding plate 8 is formed in a disc shape. The second X-ray shielding plate 8 can rotate around the central axis of the second X-ray shielding plate 8.

  The second X-ray shielding plate 8 has an X-ray transmission window 8a as a second X-ray transmission window that transmits the second X-ray (second X-ray bundle R2). Here, the X-ray transmission window 8a is a rectangular opening. The size of the X-ray transmission window 8a is equal to or larger than the size of the second X-ray transmission part 4b. The X-ray transmission window 8a faces only the second X-ray transmission part 4b among the first X-ray transmission part 4a and the second X-ray transmission part 4b. The X-ray transmission window 8a faces the second X-ray transmission part 4b to completely expose the second X-ray transmission part 4b.

The first X-ray shielding plate 7 and the second X-ray shielding plate 8 are repeatedly switched to the first state, the second state, the third state, and the fourth state by rotating.
In the first state, the X-ray transmission window 7a faces the first X-ray transmission portion 4a, the first X-ray shielding plate 7 transmits the first X-ray, and the X-ray transmission window 8a is separated from the second X-ray transmission portion 4b. The 2X-ray shielding plate 8 shields the second X-ray and thereby exposes the first X-ray.
In the second state, the X-ray transmission window 7a is detached from the first X-ray transmission part 4a, the first X-ray shielding plate 7 shields the first X-ray, and the X-ray transmission window 8a is separated from the second X-ray transmission part 4b. The line shielding plate 8 shields the second X-ray.

In the third state, the X-ray transmission window 7a is separated from the first X-ray transmission part 4a, the first X-ray shielding plate 7 shields the first X-ray, and the X-ray transmission window 8a faces the second X-ray transmission part 4b and the second X The line shielding plate 8 transmits the second X-ray, and thereby exposes the second X-ray.
In the fourth state, the X-ray transmissive window 7a is separated from the first X-ray transmissive portion 4a, the first X-ray shielding plate 7 shields the first X-ray, and the X-ray transmissive window 8a is separated from the second X-ray transmissive portion 4b. The line shielding plate 8 shields the second X-ray.

The first encoder electronically reads the rotational speed and rotational phase of the first X-ray shielding plate 7. The second encoder electronically reads the rotational speed and rotational phase of the second X-ray shielding plate 8.
The first control motor controls the rotation operation of the first X-ray shielding plate 7 based on the rotation speed and rotation phase of the first X-ray shielding plate 7 read by the first encoder. The second control motor controls the rotation operation of the second X-ray shielding plate 8 based on the rotation speed and rotation phase of the second X-ray shielding plate 8 read by the second encoder. The first X-ray shielding plate 7 and the second X-ray shielding plate 8 can be rotated independently.

  Also in this embodiment, a motor having a control function can be used as the first control motor and the second control motor, and a function of arbitrarily controlling the rotation phase angle can be provided.

  According to the X-ray tube apparatus according to the second embodiment configured as described above, the X-ray tube apparatus includes the X-ray tube 1 and the X-ray shutter 3. The X-ray tube 1 includes an anode target 60 on which a first focal point F1 and a second focal point F2 are formed at intervals. The X-ray shutter 3 includes an X-ray diaphragm member 4, a first X-ray shielding plate 7, and a second X-ray shielding plate 8.

  The X-ray diaphragm member 4 is formed at a distance from the first X-ray transmission part 4a that transmits the first X-rays emitted from the first focal point F1 and the first X-ray transmission part 4a, and is emitted from the second focal point F2. And a second X-ray transmission part 4b that transmits the second X-rays.

  The first X-ray shielding plate 7 has an X-ray transmission window 7a that transmits the first X-ray. The second X-ray shielding plate 8 has an X-ray transmission window 8a that transmits the second X-ray. The first X-ray shielding plate 7 and the second X-ray shielding plate 8 are repeatedly switched to the first state S1, the second state S2, the third state S3, and the fourth state S4 by rotating. Since the first X-ray shielding plate 7 and the second X-ray shielding plate 8 themselves are configured to rotate, the rotation speed of the first X-ray shielding plate 7 and the second X-ray shielding plate 8 is controlled to switch to the first state S1. Then, the period T1 from when it is switched to the third state S3 can be easily shortened. Thereby, the X-ray shutter 3 can improve the switching speed between the exposure of the first X-ray (first X-ray bundle R1) and the exposure of the second X-ray (second X-ray bundle R2).

  Furthermore, by controlling the rotation operation of the first X-ray shielding plate 7 and the second X-ray shielding plate 8, the length (frame rate) of one frame period T2 can be controlled. The period of the second state S2 and the period of the fourth state S4 can be controlled to be non-uniform. Since the period of the fourth state S4 can be made longer than the period of the second state S2, when performing image processing for obtaining parallax between images of the first X-ray exposure and the second X-ray exposure, It is possible to obtain a stereoscopic image with less dynamic blur even if the frame rate is lowered to minimize exposure by moving the subject during exposure to artifacts due to dynamic blur and affecting the image. .

  In addition, the X-ray tube apparatus according to the present embodiment can obtain the same effects as those of the X-ray tube apparatus according to the first embodiment described above.

  From the above, it is possible to obtain the X-ray shutter 3 and the X-ray tube apparatus including the X-ray shutter that can improve the switching speed between the first X-ray exposure and the second X-ray exposure. And the X-ray shutter 3 and X-ray tube apparatus which can thin out unnecessary X-ray exposure can be obtained.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, the positional relationship among the X-ray diaphragm member 4, the first X-ray shielding plate 5, and the second X-ray shielding plate 6 between the X-ray tube 1 and the subject is not limited to the above-described example, and can be variously modified. It is. The same applies to the positional relationship among the X-ray diaphragm member 4, the first X-ray shielding plate 7, and the second X-ray shielding plate 8.

  The X-ray tube device may include a housing that houses the X-ray tube 1 and the stator coil 2, and an insulating oil that serves as a coolant filled in the housing. In this case, the X-ray diaphragm member 4 may be formed as a part of the casing.

  Various means and methods for forming the two focal points can be used. For example, the X-ray tube apparatus can be realized by using two X-ray tubes 1. Further, it can be realized by preparing only one electron emission source and deflecting electrons emitted from this electron emission source.

  The means and method for photographing the right-eye image and the left-eye image under the same conditions (dose) can be variously modified. For this reason, it can also be realized by using different filaments for the first filament 11 and the second filament 12 or passing different filament currents through the first filament 11 and the second filament 12.

  If the image detected on the detector side can be corrected, the X-ray tube apparatus may not be configured to capture the right-eye image and the left-eye image under the same conditions (dose). Good.

  In addition to the above-described examples, various X-ray shields are used for forming the X-ray diaphragm member 4, the first X-ray shield plate 5, the second X-ray shield plate 6, the first X-ray shield plate 7 and the second X-ray shield plate 8. It is possible to use materials. For example, the X-ray shielding material includes a metal which is at least one of tungsten, tantalum, molybdenum, barium, bismuth, rare earth metal and lead, and at least one compound of tungsten, tantalum, molybdenum, barium, bismuth, rare earth metal and lead Can be used.

  The X-ray tube apparatus may include one encoder and one control motor. In this case, the encoder can electronically read the rotational speed and rotational phase of the first X-ray shielding plate 5 and the second X-ray shielding plate 6 (the first X-ray shielding plate 7 and the second X-ray shielding plate 8). The control motor can be driven directly by a stepping motor or servo motor whose rotation angle can be controlled, or a first X-ray shielding plate 5 and a second X-ray shielding plate 6 (first X-ray shielding plate 7 and The rotational operation of the first X-ray shielding plate 5 and the second X-ray shielding plate 6 (the first X-ray shielding plate 7 and the second X-ray shielding plate 8) is controlled by transmitting rotational torque to the 2X-ray shielding plate 8). Can do.

  In the first embodiment, the electrons emitted from the first filament 11 and the second filament 12 can be electrically controlled (grid potential control) at a predetermined timing so as not to collide with the anode target 60. It is. Here, the grid potential control refers to controlling the potential of the grid electrode positioned between the first filament 11 and the second filament 12 and the anode target 60. The grid electrode is set to a first potential that permits the collision of electrons with the anode target 60 or a second potential that prohibits the collision of electrons with the anode target 60.

  Since the timing for forming the first focus F1 (emitting the first X-ray) and the timing for forming the second focus F2 (emitting the second X-ray) can be controlled, in this case, the second X-ray shielding plate 6 is used. Even if the X-ray shutter 3 is formed without any effect, the same effect as that of the first embodiment can be obtained. Next, items related to grid potential control will be described.

A target on which a first focus and a second focus are formed spaced apart from each other;
An X-ray shield is provided outside the X-ray tube in which an electron gun having a function capable of independently controlling ON / OFF of the X-ray output by the electronic control method at the first focus and the second focus. The first shielding plate that is made of a material and is rotatable, has a function capable of detecting the rotational phase angle, and a rotating motor including a motor capable of changing the rotational speed, and is taken out from each focal point by rotation. Detects the rotational phase angle of the first shielding plate with an X-ray device with a structure where one or more X-ray bundles that can pass through the X-ray bundle are provided at positions where the X-ray bundles emitted from the two focal points can be alternately extracted. In synchronism with this, when the opening comes to the position of one focusing window, X-rays are exposed by the electronic control method, so that the period of T1 and the period of S1, S2, and S3 are At the rotational speed of one shielding plate, the period of T2 and the time when S4 is not exposed By thinning out the X-ray exposure in a controlled way, and S2, the X-ray tube apparatus, characterized in that to control execution intervals of the S4 arbitrary time.

  The embodiment of the present invention is not limited to the above-described X-ray tube apparatus, and can be applied to various X-ray tube apparatuses. The embodiment of the present invention is applicable to various systems such as an X-ray stereo imaging system, an X-ray stereo cine imaging system, and a stereo pulse fluoroscopy system.

  DESCRIPTION OF SYMBOLS 1 ... X-ray tube, 3 ... X-ray shutter, 4 ... X-ray aperture member, 4a ... 1st X-ray transmissive part, 4b ... 2nd X-ray transmissive part, 5, 7 ... 1st X-ray shielding board, 6, 8 ... 1st 2X-ray shielding plate, 5a, 6a, 7a, 8a ... X-ray transmission window, 10 ... cathode, 11 ... first filament, 12 ... second filament, 60 ... anode target, F1 ... first focus, F2 ... second focus .

Claims (19)

A first X-ray transmitting part that is formed of an X-ray shielding material and transmits the first X-rays emitted from the first position, and transmits the second X-rays emitted from the second position spaced from the first position. An X-ray shielding member having a second X-ray transmission part;
The first X-ray transmission part and the second X-ray transmission part are arranged opposite to each other, formed of an X-ray shielding material, and having an X-ray transmission window that transmits the first X-ray and the second X-ray, A first state in which an X-ray transmission window faces the first X-ray transmission portion, transmits the first X-ray, shields the second X-ray, and exposes the first X-ray; and the X-ray transmission window is the first X-ray A second state in which the first X-ray and the second X-ray are separated from the X-ray transmission unit and the second X-ray transmission unit, and the X-ray transmission window is opposed to the second X-ray transmission unit and transmits the second X-ray. A third state in which the first X-ray is shielded and the second X-ray is exposed, and the X-ray transmissive window is separated from the first X-ray transmissive portion and the second X-ray transmissive portion to shield the first X-ray and the second X-ray. An X-ray shielding plate that is repeatedly switched to the fourth state;
X-ray shutter provided with. An encoder that electronically reads the rotational speed and rotational phase of the X-ray shielding plate;
A control motor for controlling the rotational operation of the X-ray shielding plate based on the rotational speed and rotational phase read by the encoder;
The X-ray shutter according to claim 1, further comprising:   The X-ray shutter according to claim 2, wherein the control motor controls a time interval for switching from the first state to the third state. The other X-ray transmission window is arranged to face the X-ray shielding member, is formed of an X-ray shielding material, and has another X-ray transmission window that transmits X-rays. Another X-ray shielding plate facing the transmission part and the second X-ray transmission part;
Another encoder that electronically reads the rotational speed and rotational phase of the other X-ray shielding plate;
Another control motor for controlling the rotational operation of the other X-ray shielding plate based on the rotational speed and rotational phase of the other X-ray shielding plate read by the other encoder;
Further comprising
The X-ray shutter according to claim 3, wherein the other control motor controls a time interval for switching from the first state to the next first state.   The X-ray shutter according to claim 4, wherein the other control motor controls the period of the second state and the period of the fourth state to be non-uniform.   The X-ray shutter according to claim 1, wherein the X-ray shielding plate is formed in a disc shape.   The X-ray shutter according to claim 1, further comprising a counterbalance provided on the X-ray shielding plate.   The X-ray shutter according to claim 1, wherein the X-ray shielding plate further includes a cutout portion that balances rotation balance. A first X-ray transmitting part that is formed of an X-ray shielding material and transmits the first X-rays emitted from the first position, and transmits the second X-rays emitted from the second position spaced from the first position. An X-ray shielding member having a second X-ray transmission part;
A first X-ray shielding plate disposed opposite to the first X-ray transmission portion, formed of an X-ray shielding material, and having a first X-ray transmission window that transmits the first X-ray;
A second X-ray shielding plate disposed opposite to the second X-ray transmission part, formed of an X-ray shielding material, and having a second X-ray transmission window that transmits the second X-ray,
The first X-ray shielding plate and the second X-ray shielding plate rotate, respectively, so that the first X-ray transmission window faces the first X-ray transmission portion and transmits the first X-ray, and the second X-ray transmission window A first state in which the second X-ray is removed from the second X-ray transmission part, the second X-ray is shielded and the first X-ray is exposed, and the first X-ray transmission window is removed from the first X-ray transmission part to remove the first X-ray. A second state in which the second X-ray transmission window is shielded and shielded from the second X-ray transmission part and the second X-ray transmission part is shielded; and the first X-ray transmission window is detached from the first X-ray transmission part and the first X-ray transmission part. A third state in which the second X-ray transmission window is opposed to the second X-ray transmission portion and transmits the second X-ray to expose the second X-ray, and the first X-ray transmission window is the first X-ray. The second X-ray transmission window shields the first X-ray out of the transmission part and the second X-ray transmission window transmits the second X-ray transmission. A fourth state for blocking said first 2X line off from the switch repeatedly, X-rays shutter. An encoder for electronically reading the rotational speed and rotational phase of the first X-ray shielding plate or the second X-ray shielding plate;
A control motor for controlling the rotational operation of the first X-ray shielding plate and the second X-ray shielding plate based on the rotational speed and the rotational phase read by the encoder;
The X-ray shutter according to claim 9, further comprising:   The X-ray according to claim 10, wherein the control motor controls a time interval for switching from the first state to the third state and a time interval for switching from the first state to the next first state. Shutter.   The X-ray shutter according to claim 10, wherein the control motor controls the period of the second state and the period of the fourth state to be non-uniform. A first encoder that electronically reads the rotational speed and rotational phase of the first X-ray shielding plate;
A first control motor for controlling a rotation operation of the first X-ray shielding plate based on the rotation speed and the rotation phase read by the first encoder;
A second encoder that electronically reads the rotational speed and rotational phase of the second X-ray shielding plate;
A second control motor for controlling the rotational operation of the second X-ray shielding plate based on the rotational speed and rotational phase read by the second encoder;
The X-ray shutter according to claim 9, further comprising:   The X-ray shutter according to claim 9, wherein at least one of the first X-ray shielding plate and the second X-ray shielding plate is formed in a disc shape.   The X-ray shutter according to claim 9, further comprising a counterbalance provided on at least one of the first X-ray shielding plate and the second X-ray shielding plate.   10. The X-ray shutter according to claim 9, wherein at least one of the first X-ray shielding plate and the second X-ray shielding plate further includes a cutout portion that balances rotation balance. A target on which a first focus and a second focus are formed spaced apart from each other;
A first X-ray transmission portion that is disposed opposite to the first focus and the second focus, is formed of an X-ray shielding material, and transmits the first X-ray radiated from the first focus, and is spaced from the first X-ray transmission portion An X-ray shielding member having a second X-ray transmitting portion that is formed with a second X-ray transmitted therethrough and transmits the second X-ray emitted from the second focal point;
The first X-ray transmission part and the second X-ray transmission part are arranged opposite to each other, formed of an X-ray shielding material, and having an X-ray transmission window that transmits the first X-ray and the second X-ray, A first state in which an X-ray transmission window faces the first X-ray transmission portion, transmits the first X-ray, shields the second X-ray, and exposes the first X-ray; and the X-ray transmission window is the first X-ray A second state in which the first X-ray and the second X-ray are separated from the X-ray transmission unit and the second X-ray transmission unit, and the X-ray transmission window is opposed to the second X-ray transmission unit and transmits the second X-ray. A third state in which the first X-ray is shielded and the second X-ray is exposed, and the X-ray transmissive window is separated from the first X-ray transmissive portion and the second X-ray transmissive portion to shield the first X-ray and the second X-ray. An X-ray shielding plate that is repeatedly switched to the fourth state;
An X-ray tube device. A target on which a first focus and a second focus are formed spaced apart from each other;
A first X-ray transmission portion that is disposed opposite to the first focus and the second focus, is formed of an X-ray shielding material, and transmits the first X-ray radiated from the first focus, and is spaced from the first X-ray transmission portion An X-ray shielding member having a second X-ray transmitting portion that is formed with a second X-ray transmitted therethrough and transmits the second X-ray emitted from the second focal point;
A first X-ray shielding plate disposed opposite to the first X-ray transmission portion, formed of an X-ray shielding material, and having a first X-ray transmission window that transmits the first X-ray;
A second X-ray shielding plate disposed opposite to the second X-ray transmission part, formed of an X-ray shielding material, and having a second X-ray transmission window that transmits the second X-ray,
The first X-ray shielding plate and the second X-ray shielding plate rotate, respectively, so that the first X-ray transmission window faces the first X-ray transmission portion and transmits the first X-ray, and the second X-ray transmission window A first state in which the second X-ray is removed from the second X-ray transmission part, the second X-ray is shielded and the first X-ray is exposed, and the first X-ray transmission window is removed from the first X-ray transmission part to remove the first X-ray. A second state in which the second X-ray transmission window is shielded and shielded from the second X-ray transmission part and the second X-ray transmission part is shielded; and the first X-ray transmission window is detached from the first X-ray transmission part and the first X-ray transmission part. A third state in which the second X-ray transmission window is opposed to the second X-ray transmission portion and transmits the second X-ray to expose the second X-ray, and the first X-ray transmission window is the first X-ray. The second X-ray transmission window shields the first X-ray out of the transmission part and the second X-ray transmission window transmits the second X-ray transmission. A fourth state for blocking said first 2X line off from the switch repeatedly, X-rays tube device. An electron emission source;
A target on which a first focus and a second focus are formed spaced apart from each other;
A first X-ray transmission portion that is disposed opposite to the first focus and the second focus, is formed of an X-ray shielding material, and transmits the first X-ray radiated from the first focus, and is spaced from the first X-ray transmission portion An X-ray shielding member having a second X-ray transmitting portion that is formed with a second X-ray transmitted therethrough and transmits the second X-ray emitted from the second focal point;
The first X-ray transmission part and the second X-ray transmission part are arranged opposite to each other, formed of an X-ray shielding material, and having an X-ray transmission window that transmits the first X-ray and the second X-ray, A first state in which an X-ray transmission window faces the first X-ray transmission portion, transmits the first X-ray, shields the second X-ray, and exposes the first X-ray; and the X-ray transmission window is the first X-ray A second state in which the first X-ray and the second X-ray are separated from the X-ray transmission unit and the second X-ray transmission unit, and the X-ray transmission window is opposed to the second X-ray transmission unit and transmits the second X-ray. A third state in which the first X-ray is shielded and the second X-ray is exposed, and the X-ray transmissive window is separated from the first X-ray transmissive portion and the second X-ray transmissive portion to shield the first X-ray and the second X-ray. An X-ray shielding plate that is repeatedly switched to the fourth state;
An X-ray tube apparatus comprising: a grid electrode that is positioned between the electron emission source and the target and controls a timing of forming the first focus and the second focus.

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