JP2001029339A - X-ray diagnostic equipment - Google Patents

Abstract

(57) [Problem] To provide an image receiving surface of an X-ray flat panel detector and a central axis of X-ray, for example, when imaging is performed by bringing a flat X-ray flat panel detector into close contact with a subject. By performing imaging that is not orthogonal, it is possible to prevent the inconvenience that the image receiving surface of the X-ray flat panel detector does not match the X-ray irradiation field. SOLUTION: A rectangular diaphragm blade is constituted by a parallel movable blade 4 that can be translated and a rotary blade 5 that is provided at the tip of the parallel movable blade 4 so as to be able to rotate in parallel. Then, the rotation axis of the rotary wing 5 is moved in parallel by moving the parallel moving wing 4 in parallel via the slide rail 3 in accordance with the imaging angle, and the rotary wing 5 is driven to rotate. As a result, regardless of the imaging angle, X
The radiation field can be matched with the image receiving surface of the X-ray flat panel detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus provided with an X-ray flat panel detector in which a plurality of X-ray detecting elements formed of a semiconductor are two-dimensionally arranged as X-ray detecting means. In particular, when the imaging is performed with the X-ray flat panel detector in close contact with the subject, for example, the relationship in which the center axis of the X-ray is orthogonal to the image receiving surface of the X-ray flat panel detector is lost. The present invention relates to an X-ray diagnostic apparatus that prevents inconvenience that causes trouble.

[0002]

2. Description of the Related Art Conventionally, for example, an X-ray tube and an I.V. I. A TV system (image intensifier-television camera device) is arranged facing the X-ray tube and the I.V. I. An X-ray diagnostic apparatus having an X-ray movable aperture between the X-ray diagnostic apparatus and the X-ray diagnostic apparatus is known. I. Capture of X-ray image I. Irrespective of the positioning at the time of imaging, the image receiving surface has a relationship orthogonal to the central axis of the X-ray emitted from the X-ray tube.
Such I. I. Is provided on the premise of the relationship between the image receiving surface and the central axis of the X-ray.

[0003] I. The -TV system is mainly formed by an image intensifier (II) and a television camera device (TV), and is formed by exposing a subject to X-rays from an X-ray tube. X-ray image I. Is converted into an optical image, and the optical image is picked up by a television camera device, so that an electric signal (imaging signal) corresponding to the X-ray image is obtained.
Is formed and supplied to a monitor device or the like.
Thereby, observation of an X-ray image becomes possible via the monitor device.

As shown in FIG. 8, the X-ray movable diaphragm comprises a frame 101, a circular diaphragm 102, an X-ray compensating filter 103, and a square diaphragm 104 at the subsequent stage of the X-ray tube 100 (on the X-ray irradiation side). Each is configured by laminating so as to be coaxial with the central axis of the X-ray.

[0005] The rectangular diaphragm blade 104 is composed of a vertical wing 112 and a horizontal wing 113 whose end faces for shaping the X-ray irradiation field by a motor 110 and a rotating belt 111 are movable in a direction perpendicular to the end face. For example, I.
I. When the image receiving surface of the X-ray image of
It is used to match the image receiving range of a line image, or to narrow the X-ray irradiation field to a clinically necessary range even when the X-ray receiving surface is not rectangular. .

[0006] The X-ray compensation filter 103 is formed of, for example, a rubber member mixed with barium, and attenuates X-rays to a predetermined intensity.

The circular diaphragm blade 102 has a plurality of rotating blades 115.
Allows the diameter of the circular opening 116 to be variable while maintaining the center of the circular opening 116.
I. When the image receiving surface of the X-ray image of
It is used to match the image receiving range of the line image.

[0008] By using the X-ray movable diaphragm having such a configuration, as shown in FIG.
0 arranged perpendicular to the central axis of the X-rays emitted through I. The X-ray irradiation field can be matched to the 130 circular or square image receiving surface. In addition, I.
I. -Even when the TV system is moved along the center axis of the X-ray, the center axis of the X-ray and the I.V. I. The relationship with the image receiving surface 130 can be maintained.

Here, at present, the I.D. I. -TV
An X-ray flat panel detector is known as an X-ray detection unit replacing the system. This X-ray flat panel detector is configured by two-dimensionally arranging a plurality of X-ray detection elements, and receives an X-ray image directly or indirectly by each X-ray detection element, and To form an imaging signal corresponding to.

Since such an X-ray flat panel detector is formed of an X-ray detecting element which is a semiconductor element, it can be formed into a flat plate as a whole. I. -It can be formed lighter and smaller than a TV system. Further, since the whole is a flat plate shape, the X-ray flat panel detector 140 can be brought into close contact with the subject as shown in FIG. Fluoroscopy or imaging). For this reason, I.I.
I. It is expected that many X-ray diagnostic apparatuses will be provided instead of the TV system.

[0011]

However, I.I. I. In an X-ray diagnostic apparatus provided with a TV system, regardless of the positioning at the time of imaging, the X-ray tube 100
Central axis of X-rays emitted from I. The X-ray movable stop 120 is also adapted to maintain such a relationship that the image receiving surface of the X-ray orthogonal to the image receiving surface. I. Because it has a function based on the relationship between the image receiving surface of 130 and the central axis of the X-ray,
When an X-ray diagnostic apparatus is provided with an X-ray flat panel detector as X-ray detection means, the I.D. I. When the X-ray movable diaphragm 120 having the same function as that when the TV system is provided is provided, the following problem occurs.

That is, by providing the X-ray flat panel detector in the X-ray diagnostic apparatus, it is possible to perform imaging at a deep angle with the X-ray flat panel detector 140 in close contact with the subject as shown in FIG. 9B. However, when such a deep angle is formed, the orthogonal relationship between the image receiving surface of the X-ray flat panel detector 140 and the central axis of the X-ray is broken, and the image receiving surface of the X-ray flat panel detector 140 is distorted. X-rays are applied obliquely with respect to.

The movable X-ray stop 120 is provided with the X-ray flat panel detector 1.
Since it has a function on the premise that the image receiving surface 40 and the central axis of the X-ray are orthogonal to each other, if the X-ray movable field 120 is used to shape the X-ray irradiation field in this imaging state, X The X-ray irradiation field becomes an equilateral trapezoid or a trapezoid as shown by oblique lines in FIG. 10, making it difficult to match the image receiving surface of the X-ray flat panel detector 140 with the X-ray irradiation field.

If the image receiving surface of the X-ray flat detector 140 does not match the X-ray irradiation field, the X-ray irradiation field is changed to the X-ray flat detector 1.
The X-rays protrude from the image receiving surface 40 and are not used for imaging. In addition, there is a disadvantage that a portion not used for imaging (a portion not irradiated with X-rays) is generated at a peripheral portion of the X-ray flat panel detector 140 or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to provide an X-ray imaging system in which the relationship between the central axis of X-rays orthogonal to the image receiving surface of the X-ray flat panel detector is lost. It is an object of the present invention to provide an X-ray diagnostic apparatus capable of shaping an X-ray irradiation field so as to coincide with an image receiving surface of an X-ray flat panel detector and performing optimum imaging regardless of an angle.

[0016]

An X-ray diagnostic apparatus according to the present invention comprises, as means for solving the above-mentioned problems, X-ray generating means for irradiating an examinee with X-rays; X-ray detectors are formed by two-dimensionally arranging the X-ray detectors, and X-rays emitted from the X-ray generator are formed by passing through the subject.
A line image is captured by the plurality of X-ray detection
X-ray plane detection means for forming a line image, support means for opposingly supporting the X-ray generation means and the X-ray plane detection means at a desired angle, and the X-rays opposingly supported by the support means An X-ray irradiator provided between the generator and the X-ray plane detector so that an image receiving surface of the X-ray plane detector coincides with an X-ray irradiation field according to an angle of the X-ray plane detector. Irradiation area shaping means for shaping a field.

In such an X-ray diagnostic apparatus, the irradiation area shaping means provided between the X-ray generating means and the X-ray flat face detecting means has a function of detecting the X-ray flat face according to the angle of the X-ray flat face detecting means. The X-ray irradiation field is shaped so that the image receiving surface of the means matches the X-ray irradiation field. Thereby, for example, by imaging the subject by bringing the X-ray plane detecting means into close contact with the subject,
Even in the case of performing imaging in which the orthogonal relationship between the central axis of the line and the image receiving surface of the X-ray flat panel detector is broken, an X-ray irradiation field that matches the image receiving surface of the X-ray flat panel detecting means can be obtained. .

For this reason, it is possible to prevent the inconvenience that the X-ray irradiation field protrudes from the image receiving surface of the X-ray plane detecting means, causing unnecessary X-ray irradiation not used for imaging. Can be. In addition, it is possible to prevent a problem that a portion that is not used for imaging (a portion that is not irradiated with X-rays) is formed on a peripheral portion or the like of the X-ray flat surface detecting device due to a mismatch between the image receiving surface of the X-ray flat surface detecting device and the X-ray irradiation field. be able to.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] [Overall Configuration] An X-ray diagnostic apparatus according to the present invention comprises, for example, an X-ray tube and an X-ray at both ends of a C-arm having a C-shape. The present invention can be applied to an X-ray diagnostic apparatus in which a flat detector is arranged to face. The X-ray flat panel detector has a two-dimensional array of a plurality of X-ray detection elements formed of semiconductor elements, and is formed so that its appearance has a rectangular flat plate shape. An X-ray image received directly or indirectly is converted into an imaging signal which is an electric signal and supplied to a monitor device or the like.

The X-ray flat panel detector is provided at one end of the C-arm via a support, and can be rotated at various angles by the support and along the center axis of the X-ray tube. It is possible to move. Therefore, the X-ray flat panel detector can be brought into close contact with the subject by adjusting the angle by the support portion, and imaging (perspective or imaging) with a deep angle can be performed. Further, by adjusting the position of the X-ray flat panel detector by the support unit, enlargement or reduction imaging by moving the focal length is possible.

[Structure of X-ray movable diaphragm] The X-ray diagnostic apparatus according to the first embodiment includes an X-ray flat panel detector
An X-ray movable diaphragm for shaping the X-ray irradiation field on the image receiving surface of the X-ray flat panel detector is provided between the movable tube and the X-ray tube. X
As described with reference to FIG. 8, the X-ray movable diaphragm has a circular diaphragm blade, an X-ray compensation filter, and a rectangular diaphragm blade disposed downstream of the X-ray tube (on the X-ray irradiation side), and is coaxial with the X-ray central axis. In the X-ray diagnostic apparatus of the first embodiment, a rectangular diaphragm having a configuration as shown in FIG. 1 is provided as the rectangular diaphragm. It is characterized by being.

[Structure of rectangular aperture blade] That is, the first
A rectangular diaphragm provided in the X-ray diagnostic apparatus according to the embodiment includes a pair of longitudinal wings 1 provided opposite to each other,
And a pair of side wings 2 provided to face each other so as to move in parallel in a direction perpendicular to the moving direction of the wing.

Each of the wings 1 and 2 has a parallel moving wing 4 slidably held by a pair of slide rails 3. The parallel moving wing 4 is moved along the slide rail 3 by a parallel moving mechanism. The X-ray tube 7 translates in a direction perpendicular to the central axis of the X-rays emitted from the X-ray tube 7. A rotary wing 5 is rotatably provided near the tip of the parallel moving wing 4. The rotating blade 5 has a rotating shaft 6 attached to a rotating shaft of a motor via a speed reduction mechanism, and is orthogonal to a central axis of X-rays emitted from an X-ray tube 7 according to the rotating operation of the motor. It rotates in parallel to the direction.

[Operation of First Embodiment] The X-ray diagnostic apparatus according to the first embodiment having the above-described configuration detects an X-ray plane set by an operator when fluoroscopy or imaging is performed. Based on the setting position and the setting angle of the vessel, the parallel movement control and the rotation control of the parallel moving wing 4 and the rotating wing 5 of the vertical wing 1 and the horizontal wing 2 are performed.

[Moving / Rotating Amount Calculating Operation]
As shown in FIG. 2, an SID detection unit 15 and a tilt angle detection unit 16 are provided on a support unit that supports the X-ray flat panel detector. In FIG. 2, a rectangular range indicated by oblique lines indicates an image receiving surface of the X-ray flat panel detector.
Reference numeral 5 denotes the position of the X-ray flat panel detector from the focal point of the X-ray tube 7 based on the position of the X-ray flat detector when the X-ray flat detector is moved and adjusted in the direction along the central axis of the X-ray. The distance L (= SID) to the center P is detected, and this detection output is supplied to the calculation unit 17.

The tilt angle detecting unit 16 further includes a tilt angle φ with respect to the center axis of the X-ray and an X-ray plane based on the position of the X-ray flat panel detector when the angle of the X-ray flat panel detector is adjusted. The rotation angle θ of the detector is detected. The tilt angle φ is X
The inclination angle when the center axis of the X-ray is perpendicular to the center of the image receiving surface of the line flat detector is 0 degree, and is an angle in the plus direction or the minus direction. The rotation angle θ is, for example, assuming that the X-ray flat panel detector is set parallel to the ground, and the X-ray flat panel detector is rotated in a direction parallel to the ground, so that a reference position (angle: 0) This is an angle indicating how much the angle has been rotated from (°).

The respective detection outputs from the SID detection unit 15 and the inclination angle detection unit 16 are calculated by the calculation unit 17 shown in FIG.
Supplied to The calculation unit 17 calculates the translation amount and the rotation amount of the translation wings 4 and the rotation wings 5 of the vertical wings 1 and the horizontal wings 2 to match the image receiving surface of the X-ray flat panel detector with the X-ray irradiation field. . Then, the calculation output is supplied to the wing control unit 18.

[Move / Rotation Control Operation] The wing control unit 18
Based on the calculation output from the calculation unit 17, the X-ray irradiation field matches the image receiving surface of the X-ray flat detector with the translation wing 4 and the rotary wing 5 of the vertical wing 1 and the horizontal wing 2 shown in FIG. And the translation control and the rotation control.

More specifically, the wing controller 18 first controls the movement of each of the parallel wings 4 of the vertical wing 1 and the horizontal wing 2 based on the calculation output from the calculation unit 17. As a result, the respective parallel moving wings 4 move in parallel along the pair of slide rails 3, and accordingly, the rotating shaft 6 of the rotating wing 5 provided near the tip of each of the parallel moving wings 4 moves in parallel. Will be done.

Next, the wing control section 18 controls the rotation of each rotary wing 5 of the vertical wing 1 and the horizontal wing 2 based on the calculation output from the calculation section 17. As a result, each rotary wing 5 rotates by the calculated angle, and the X-ray irradiation field is detected by the respective rotary wings 5 and each translation wing 4 as shown by the hatched area in FIG. It will be shaped to match the image receiving surface of the container.

[Effects of the First Embodiment] As is clear from the above description, the X-ray diagnostic apparatus of the first embodiment has the parallel wings provided on the vertical wing 1 and the horizontal wing 2 respectively. The moving wings 4 and the rotary wings 5 can shape the X-ray irradiation field so that the X-ray irradiation field coincides with the image receiving surface of the X-ray flat panel detector. Therefore, for example, by imaging the X-ray flat panel detector in close contact with the subject, imaging in which the orthogonal relationship between the central axis of the X-ray and the image receiving surface of the X-ray flat panel detector is broken. Is performed, an X-ray irradiation field that matches the image receiving surface of the X-ray flat panel detector can be obtained.

Therefore, it is possible to prevent the inconvenience that the X-ray irradiation field protrudes from the image receiving surface of the X-ray flat panel detector, causing unnecessary X-ray irradiation not used for imaging. it can. Further, the image receiving surface of the X-ray flat panel detector and X
It is possible to prevent a problem that a portion that is not used for imaging (a portion that is not irradiated with X-rays) is generated at a peripheral portion or the like of the X-ray plane detecting unit due to a mismatch with the X-ray irradiation field.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
The X-ray diagnostic apparatus according to the embodiment will be described. The first mentioned above
In the X-ray diagnostic apparatus according to the embodiment, the rotary wings 5 are provided on the parallel moving wings 4, and the rectangular diaphragm wings are configured to move the rotary wings 5 along with the parallel moving wings 4 along the pair of slide rails 3. However, the X-ray diagnostic apparatus according to the second embodiment has a configuration of a square diaphragm blade through omitting the translation wing 4 by directly providing the rotary wing 5 on the translation mechanism. This is for simplification.

The first embodiment described above and the second embodiment
Only the configuration of this rectangular aperture blade is different from that of the first embodiment. Therefore, in the following description of the second embodiment, only this difference will be described, and redundant description will be omitted.

[Structure of the square diaphragm blade of the second embodiment]
FIG. 3 shows a part of a square diaphragm provided in the X-ray diagnostic apparatus according to the second embodiment. FIG. 3 shows one of the vertical wings 1 or the horizontal wings 2 provided on the square diaphragm blade. The illustrated mechanism (hereinafter, referred to as a square diaphragm blade) is as shown in FIG. It should be understood that four sets constitute one rectangular aperture blade.

As can be seen from FIG. 3, the rectangular diaphragm blade has a rectangular parallelepiped slide rail 25, a movable body 26 capable of moving in parallel along the longitudinal direction of the slide rail 25, and a movable body 26. And a fixed arm 27 fixed at one end to the moving body 26 so as to protrude along the longitudinal direction of the slide rail 25, and a substantially rectangular plane provided at the other end of the fixed arm 27 so as to be rotatable along a rotation shaft 28. And a plate-shaped rotary wing 29.

[Operation of the square diaphragm blade of the second embodiment]
In the X-ray diagnostic apparatus according to the second embodiment having such a rectangular diaphragm, the wing controller 18 first controls the movement of the moving body 26 based on the calculation output from the calculator 17. As a result, the moving body 26 moves in parallel along the slide rail 25, and accordingly, the rotating shaft 28 of the rotary wing 29 provided on the moving body 26 moves in parallel.

Next, although not shown, the rotating shaft 28 is attached to the rotating shaft of the motor via a speed reduction mechanism.
In accordance with the rotation control of the motor, the rotary wings 29 rotate in parallel as indicated by arrows in FIG. Wing controller 18
Controls the rotation of the rotary blade 29 via the motor based on the calculation output from the calculation unit 17. This allows
The rotating wings 29 rotate to the calculated angles, respectively,
As shown by the shaded area in FIG. 1, the X-ray irradiation field is shaped by each of the rotating blades 29 so as to coincide with the image receiving surface of the X-ray flat panel detector.

[Effects of the Second Embodiment] As is clear from the above description, the X-ray diagnostic apparatus of the second embodiment has an X-ray irradiation field of X-ray plane by each rotary wing 29. The X-ray irradiation field can be shaped so as to coincide with the image receiving surface of the detector. Therefore, the same effect as that of the X-ray diagnostic apparatus according to the first embodiment can be obtained. In addition, by providing the rotating wing 29 directly on the moving body 26,
Can be omitted, thereby simplifying the configuration of the rectangular aperture blade.

[Third Embodiment] Next, a third embodiment of the present invention will be described.
The X-ray diagnostic apparatus according to the embodiment will be described. The X-ray diagnostic apparatus according to the third embodiment is different from the X-ray diagnostic apparatus according to each of the above-described embodiments.
The X-ray irradiation field is shaped by using a rectangular diaphragm having a different configuration from the rectangular diaphragm provided in the X-ray diagnostic apparatus. It should be noted that since only the configuration of the rectangular diaphragm is different between each of the above-described embodiments and the third embodiment, only the difference will be described in the following description of the third embodiment. And a duplicate description will be omitted.

[Structure of the rectangular diaphragm blade of the third embodiment]
FIG. 4 shows a part of a rectangular diaphragm provided in the X-ray diagnostic apparatus according to the third embodiment. FIG. 4 shows one of the vertical wings 1 or the horizontal wings 2 provided on the rectangular aperture blade. The illustrated mechanism (hereinafter, referred to as a rectangular aperture blade) is arranged along the central axis of the X-ray. It should be understood that one square diaphragm blade is constituted by being provided in a stacked manner in four stages.

As can be seen from FIG. 4, the rectangular diaphragm blade has a disk-shaped rotary plate 35 having a hollow portion 34, a pair of slide rails 36 provided on the rotary plate 35,
It has a long plate-shaped parallel moving wing 37 slidably provided so as to be held between the slide rails 36. Each slide rail 36 is provided so that approximately half of the hollow portion 34 of the rotating plate 35 is shielded by the parallel moving wings 37 that have been slid.

Such a rectangular diaphragm blade is provided in the hollow portion 34 of the rotating plate 35 so that X-rays from the X-ray tube 7 pass through the hollow portion 34.
It is provided in a stacked manner. FIG. 5 is a diagram showing the respective parallel moving blades 37 of the rectangular diaphragm blades provided in a four-tiered manner. As can be seen from FIG. 5, each of the rectangular diaphragm blades is provided with a corresponding one of the parallel moving blades. At 37, four tiers are provided so as to form the vertical wing 1 or the horizontal wing 2 as shown in FIG.

[Operation of the Rectangular Aperture Blade of the Third Embodiment]
In the X-ray diagnostic apparatus according to the third embodiment having such a rectangular aperture blade, the wing control unit 18 first controls the movement of each of the parallel moving blades 37 based on the calculation output from the calculation unit 17. I do. As a result, the respective parallel moving wings 37 move in parallel along the slide rail 36. Next, the wing control unit 18 controls the rotation of the rotary plate 35 based on the calculation output from the calculation unit 17. Thereby, each rotating plate 3
Each of the parallel moving wings 37 provided on 5 is set at the calculated angle. Then, the four parallel moving blades 37 are shaped so that the X-ray irradiation field coincides with the image receiving surface of the X-ray flat panel detector, as indicated by the hatched area in FIG.

[Effects of the Third Embodiment] As is clear from the above description, the X-ray diagnostic apparatus of the third embodiment includes the translation blades 37 provided on the rotary plates 35. Accordingly, the X-ray irradiation field can be shaped so that the X-ray irradiation field coincides with the image receiving surface of the X-ray flat panel detector. For this reason, the same effect as the X-ray diagnostic apparatus of the first embodiment can be obtained.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described.
The X-ray diagnostic apparatus according to the embodiment will be described. In the X-ray diagnostic apparatus of each of the above-described embodiments, the image receiving surface of the X-ray flat panel detector is rectangular, and this rectangular image receiving surface is
Although the X-ray irradiation field is narrowed down to a square so that the X-ray irradiation field matches, the X-ray diagnostic apparatus according to the fourth embodiment has a circular image receiving surface of the X-ray flat panel detector, The X-ray irradiation field is narrowed down by a circular aperture blade as shown in FIG. 6 so that the circular image receiving surface coincides with the X-ray irradiation field. Note that, in each of the above-described embodiments and the fourth embodiment, only the point that the image receiving surface of the X-ray flat panel detector is circular and the point in which this circular diaphragm is provided are different. In the description of the fourth embodiment, only this difference will be described, and redundant description will be omitted.

[Configuration of Circular Aperture Blade of Fourth Embodiment]
In this circular diaphragm blade, the diameter of the opening 46 can be changed while maintaining the center of the circular opening 46 by a plurality of rotating blades 45, and the center of the opening 46 is It is provided so as to coincide with the central axis of the X-ray. Also,
A gyro mechanism 47 is provided on the circular diaphragm blade. The gyro mechanism 47 allows the aperture surface of the opening 46 and the image receiving surface of the X-ray flat panel detector to be irrespective of the imaging angle (the X-ray irradiation angle). Always maintain a parallel relationship.

[Operation of Circular Aperture Blade of Fourth Embodiment]
In the X-ray diagnostic apparatus according to the fourth embodiment having such a circular diaphragm blade, the wing control unit 18 controls the opening surface of the opening 46 and the X-ray plane based on the calculation output from the calculation unit 17. Gyro mechanism 4 so that the image receiving surface of the detector is parallel
7 is rotationally controlled. Next, the wing control unit 18 controls the driving of each rotary wing 45 based on the calculation output from the calculation unit 17 so that the opening 46 has a predetermined size.

[Effect of Fourth Embodiment] As a result,
Even in the case of performing imaging in which the orthogonal relationship between the image receiving surface of the X-ray flat panel detector and the central axis of the X-ray is broken, the opening surface of the opening 46 and the image reception of the X-ray flat panel detector are indicated by oblique lines in FIG. The X-ray irradiation field can be narrowed down to a circular shape by the circular aperture blade while maintaining the parallel relationship with the surface, and the image receiving surface of the X-ray flat panel detector having a circular shape can be matched with the X-ray irradiation field. Besides, the same effects as those of the X-ray diagnostic apparatus according to the first embodiment can be obtained.

[Other Examples of Application of the Present Invention] Finally, each of the above embodiments is an example of the present invention. For this reason, the present invention is not limited to each of these embodiments, but may be modified according to design, etc., other than the embodiments, as long as they do not depart from the technical idea of the present invention. Of course, various changes are possible.

[0051]

According to the X-ray diagnostic apparatus of the present invention, the image receiving surface of the X-ray plane detecting means coincides with the X-ray irradiation field according to the angle of the X-ray plane detecting means by the irradiation area shaping means. Thus, the X-ray irradiation field can be shaped. For this reason, for example, by performing imaging by bringing the X-ray flat panel detection unit into close contact with the subject, the orthogonal relationship between the central axis of the X-ray and the image receiving surface of the X-ray flat panel detector is broken. Even when imaging is performed, it is possible to form an X-ray irradiation field that matches the image receiving surface of the X-ray flat panel detection unit. Therefore, it is possible to prevent a problem that the X-ray irradiation field protrudes from the image receiving surface of the X-ray flat panel detection unit, which causes unnecessary X-ray irradiation not used for imaging. In addition, it is possible to prevent a problem that a portion that is not used for imaging (a portion that is not irradiated with X-rays) is formed on a peripheral portion or the like of the X-ray flat surface detecting device due to a mismatch between the image receiving surface of the X-ray flat surface detecting device and the X-ray irradiation field. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an appearance of a square diaphragm provided in an X-ray diagnostic apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a calculation unit for calculating a parallel movement amount and a rotation amount of the rectangular diaphragm blade.

FIG. 3 is a diagram illustrating an appearance of a square diaphragm blade constituting a square diaphragm blade provided in an X-ray diagnostic apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing the appearance of a rectangular diaphragm blade constituting a rectangular diaphragm provided in an X-ray diagnostic apparatus according to a third embodiment of the present invention.

FIG. 5 is a diagram for explaining the positional relationship between each of the rectangular aperture blade pieces of the rectangular aperture blade provided in the X-ray diagnostic apparatus according to the third embodiment.

FIG. 6 is a diagram illustrating an appearance of a circular diaphragm provided in an X-ray diagnostic apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing an X-ray irradiation field shaped by the circular diaphragm blade.

FIG. 8 is an exploded perspective view of an X-ray movable diaphragm provided in a conventional X-ray diagnostic apparatus.

FIG. 9 is a diagram for explaining a problem that occurs when the X-ray detection unit replaces the image intensifier with the X-ray flat panel detector.

FIG. 10 is a diagram for explaining a problem that an X-ray movable diaphragm provided in a conventional X-ray diagnostic apparatus does not match an image receiving surface of an X-ray flat panel detector with an X-ray irradiation field.

[Description of Signs] 1 vertical wing, 2 horizontal wing, 3 slide rail, 4 parallel moving wing, 5 rotary wing, 6 rotary shaft, 15 SID detector,
16: inclination angle detection unit, 17: calculation unit, 18: wing control unit,
25: Slide rail, 26: Moving body, 27: Fixed arm, 28: Rotating shaft, 29: Rotating wing, 34: Hollow portion, 35
... Rotating plate, 36 ... Slide rail, 37 ... Parallel wing,
45: rotating wings, 46: opening, 47: gyro mechanism

Claims (5)

[Claims] An X-ray generating means for irradiating an examinee with X-rays, and a plurality of X-ray detecting elements are formed in a two-dimensional array, and are irradiated from the X-ray generating section. X-ray plane detection means for capturing an X-ray image formed by passing X-rays through a subject on an image receiving surface formed by the plurality of X-ray detection elements to form an electrical X-ray image; A support means for supporting the X-ray generating means and the X-ray flat surface detecting means so as to be capable of forming a desired angle, and provided between the X-ray generating means and the X-ray flat surface detecting means supported by the supporting means; And an irradiation area shaping means for shaping the X-ray irradiation field so that the image receiving surface of the X-ray flat detection means coincides with the X-ray irradiation field in accordance with the angle of the X-ray plane detection means. X-ray diagnostic apparatus characterized by the following. 2. The irradiation area shaping means comprises: a first X-ray shielding plate for performing a parallel movement operation; and a second X-ray shielding plate rotatably provided on the first X-ray shielding plate.
2. The X according to claim 1, further comprising a line shielding plate.
X-ray diagnostic device. 3. The irradiation area shaping means includes: an X-ray shielding plate rotatably provided; and a translation mechanism for controlling translation of the X-ray shielding plate. X-ray diagnostic apparatus. 4. The irradiation area shaping means is provided rotatably in a plane perpendicular to the X-ray irradiation direction, and allows X-rays from the X-ray generation means to pass through an opening area of a predetermined size. A rotating plate, an X-ray shielding plate provided on the rotating plate, and an X-ray shielding plate for shielding a part of the X-ray passing through the opening region by a parallel movement operation; The X-rays from the X-ray generating means are stacked and arranged so as to pass through each opening area, and the X-ray shielding plates provided on each of the rotating plates are controlled to translate in parallel, thereby shaping the X-ray irradiation field. The X-ray diagnostic apparatus according to claim 1, wherein 5. An X-ray from the X-ray generation means passes through an opening area provided between the X-ray generation means and the irradiation area shaping means, the size of which can be changed. An aperture plate for narrowing down the X-rays by blocking the X-rays other than the aperture area; and receiving an image of the X-ray flat panel detector at least using the aperture plate regardless of the irradiation angle of the X-rays from the X-ray generation unit. The X-ray diagnostic apparatus according to claim 1, further comprising a gyro mechanism that supports the gyro in parallel with the surface.