JPH1142222A - X-ray diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the getting on/off of a patient by enabling a bed for an over-tube type X-ray diagnostic device to be lowered to the vicinity of a floor, and at the same time, ensure a sufficient distance between an X-ray tube and a solid body flat surface detector, and facilitate a chest photographing, etc., requiring this distance. SOLUTION: In a bed 1 of this over-tube type X-ray diagnosis device, a solid body flat surface detector 5 is provided in the place of an image intensifier, as an X-ray detecting means. Then, the solid body flat surface detector 5 is vertically moved by using an already existing vertically moving mechanism of the bed 1. The solid body flat surface detector 5 is formed by arranging a plurality of solid body photographing elements two-dimensionally, and for this reason, it can be made compact and thin. Therefore, the bed 1 can be lowered to the vicinity of a floor, and the getting on/off of a patient can be facilitated, and at the same time, a sufficient distance is ensured between an X-ray tube 3 and the solid body flat surface detector 5, and a chest photographing, etc., can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an over-tube type X-ray diagnostic apparatus, and more particularly to a bed provided with a flat detector capable of reducing the size and thickness of an image intensifier. The present invention relates to an X-ray diagnostic apparatus that can be lowered to a position near a floor to facilitate the getting on and off of a patient.

[0002]

2. Description of the Related Art Conventionally, there is known an overtube type X-ray diagnostic apparatus as shown in FIG.

This X-ray diagnostic apparatus supports a bed 100 on which a patient is placed, an X-ray tube 101 for emitting X-rays to the patient placed on the bed 100, and the X-ray tube 101. X
And a wire support 102. Further, the couch 100 is provided in the couch so as to face the X-ray tube 101 and a couch driving unit 103 that drives the couch 100 vertically (up and down) with respect to the floor on which the X-ray diagnostic apparatus is mounted. An image intensifier 104 (II); And a television camera device 105 that captures a visible image from I104.

[0004] Such an X-ray diagnostic apparatus comprises a bed driving unit 1
03 to lower the bed 100 to drive the patient
The patient is exposed to X-rays from the X-ray tube 101. I. provided in the couch 100. I104
Converts an X-ray image formed by passing the irradiated X-ray through a patient into a visible image. The television camera device 105 captures the visible image, and supplies a television signal formed thereby to a monitor device.

[0005] Thereby, on the display screen of the monitor device,
A fluoroscopic image or a radiographic image corresponding to the X-ray image can be displayed, and a doctor or the like can make a treatment plan or the like based on the fluoroscopic image or the radiographic image.

[0006]

However, such a conventional over-tube type X-ray diagnostic apparatus has a large volume and is formed of a vacuum tube as an X-ray image detecting means. I104
Is provided in the bed 100, so that this I.D.
The bed 100 cannot be lowered below the height at which the I104 is provided, and there is a problem that it is difficult for a patient with a disability to get on and off the bed 100.

For example, in chest imaging, the focal point of an X-ray tube 101 as X-ray generating means and I.P. A distance of 1.5 m to 2.0 m is required between the I.I. The bed 100 cannot be lowered below the height at which the I. I104 is provided. There was a problem that it was not possible to keep a sufficient distance from the I104 and it was difficult to photograph the chest and the like.

Although this problem can be solved by providing a mechanism for driving the X-ray tube 101 up and down,
For this purpose, it is necessary to newly provide such a vertical drive mechanism for the X-ray tube 101, which causes structural and cost problems.

In addition, I. The output image from the I104 (the visible image) has a circular shape with a diameter of, for example, 15 mm to 30 mm, so that the visual field (display image of the monitor device) is circular, and only a display image unsuitable for human body observation is provided. There was a problem that could not be obtained.

Further, I. The I104 has a problem that a displayed image is geometrically and magnetically distorted by scanning of an electron beam or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and enables a patient to significantly lower a bed so that a patient can easily get on and off the bed. To provide an X-ray diagnostic apparatus capable of providing a sufficient distance between objects and obtaining a display image having no geometrical or magnetic distortion and suitable for human body observation. And

[0012]

An X-ray diagnostic apparatus according to the present invention includes a bed on which a subject is placed and a subject placed on the bed to solve the above-mentioned problems. X-ray generating means for irradiating X-rays so as to be an overtube,
An X-ray image which is provided below the bed surface of the couch so as to face the X-ray generation means and which is formed by transmitting X-rays emitted from the X-ray generation means through a subject And a moving means for moving the bed and the solid flat detector in a direction approaching the floor and moving away from the floor. .

That is, the X-ray diagnostic apparatus according to the present invention comprises:
A so-called over-tube type in which X-rays are emitted from above a patient placed on a bed and an X-ray image formed thereby is detected by a solid flat panel detector provided below the bed surface of the bed. X-ray diagnostic apparatus.

Since the solid-state flat panel detector is constituted by arranging a plurality of solid-state detecting elements two-dimensionally, it can be formed smaller and thinner than an image intensifier formed by a vacuum tube. In particular, for its thickness,
For example, the image intensifier can be formed in one-tenth (or one-tenth) of the image intensifier.

Therefore, when the bed is moved in a direction approaching the floor, the bed can be lowered to a position near the floor by the moving means, and the patient with a physical disability can easily get on and off the bed. it can.

Further, since the bed can be largely lowered in this manner, a sufficient mechanism can be provided between the X-ray generation means and the solid flat panel detector without providing a special mechanism for raising and lowering the X-ray generation means. It is possible to take a distance, and it is possible to easily perform a chest imaging or the like that requires the distance for imaging.

The solid-state flat panel detector electrically reads out a charge (charge storage type) or a voltage (voltage readout type) formed by each solid-state detection element according to an X-ray image. Since scanning of an electron beam or the like is not required unlike the intensifier, a clear display image can be obtained without generating a geometrical or magnetic distortion in the display image.

Further, by making the detection surface of the solid-state flat detector rectangular, it is possible to display a rectangular display image on display means such as a monitor device, and to display a display image having a shape suitable for human body observation. Display can be enabled.

Further, the X-rays emitted from the X-ray generation means are so-called cone beams, and the bed and the solid flat panel detector are moved up and down by the moving means so that the center of the subject can be controlled. The ratio of the diameter of the X-ray irradiation range to the diameter of the corresponding X-ray irradiation range on the solid-state flat panel detector 5 changes.

That is, when the bed is controlled to be raised, the display image is enlarged because the diameter of the X-ray irradiation range at the center of the subject is reduced, and when the bed is controlled to be raised, the X-ray is irradiated at the center of the subject. The display image is reduced because the diameter of the range is increased.
This allows a doctor or the like to obtain a display image with a desired magnification only by operating the bed up and down, thereby facilitating a subsequent treatment plan.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the X-ray diagnostic apparatus according to the present invention will be described below in detail with reference to the drawings.

First, the X-ray diagnostic apparatus according to the first embodiment of the present invention is a so-called over-tube type X-ray diagnostic apparatus, on which a patient is placed as shown in FIG. A bed 1, a bed support 2 for supporting the bed 1 so as to be movable in a direction approaching the floor and away from the floor (hereinafter, movement in this direction is referred to as vertical movement), and the bed 1 is placed on the bed 1. An X-ray tube 3 that emits X-rays from above a patient;
And an X-ray support 4 for fixing and supporting the X-ray not to move up and down.

Further, this X-ray diagnostic apparatus includes:
A solid-state flat panel detector 5 provided to face the X-ray tube 3, a support 6 for supporting the whole X-ray diagnostic apparatus, and X-rays from the X-ray tube 3 according to the imaging range of the patient. An X-ray diaphragm 7 for narrowing the irradiation range, and a moving mechanism (not shown) for moving the solid flat panel detector 5 up and down together with the bed 1 are provided.

This moving mechanism is provided with an existing mechanism provided for moving the bed 1 up and down, and the bed 1 is moved up and down by this moving mechanism. The solid-state flat detector 5 provided in 1 is moved up and down.

As shown in FIG. 2, the solid-state flat panel detector 5 is constituted by a plurality of X-ray detecting elements composed of a pixel 11 and a thin film transistor (TFT) 12 arranged two-dimensionally in a column direction and a row direction. As a whole, the aspect ratio is 3: 4 in the vertical and horizontal directions (9:16 aspect ratio for HD compatible,
HD: high definition).

Each pixel 11 converts a X-ray into visible light and forms a charge corresponding to the amount of the visible light, and a capacitor (storage capacitor) for storing the charge formed by the photodiode. The TFT 12 operates as a switch for reading out the charge stored in the storage capacitor of each pixel 11.

The connection point between the cathode terminal of the photodiode and one terminal of the storage capacitor is connected to the power supply line 15-.
1, 15-2,.
Vn), and the connection point between the anode terminal of the photodiode and the other terminal of the storage capacitor is the TFT 12
Connected to the source terminal.

The gate terminal of the TFT 12 is commonly connected to each row by each of the read lines 13-1, 13-2,..., 13-n, and is connected to each line output terminal of the line drive unit 14.

The drain terminal of each TFT 12 is connected to the corresponding vertical transfer line 16-1, 16-2,.
n, the respective switches 18-of the multiplexer 18 are connected in common for each column via the respective readout amplifiers 17.
1, 18-2... 18-n.

The control unit 10 controls the TFTs 12 connected to the readout lines 13-1, 13-2,..., 13-n via the line drive unit 14 to turn on and off the TFTs 12, and the TFTs 12 are stored in the storage capacitors. The electric charges are read out and controlled by the respective vertical transfer lines 16-1, 16-2... 16-n.
Is output to the monitor device via the output terminal 19 by selectively controlling the multiplexer 18.

More specifically, each pixel 11 and TFT
The cross section of the X-ray detection element 12 is as shown in FIG. 3, and a TFT region 26 and a pixel region 27 (PD region) are provided on a support 25.

On the support 25 in the PD region 27, SiN
The x layer 32 is laminated. On the SiNx layer 32, a transparent electrode 44 connected to a source electrode 36 in the TFT region 26 described below is laminated, and on this transparent electrode 44, an n + a-Si layer 37, an ia-Si layer 38, p
By stacking the + a-Si layer 39 and the transparent electrode 40 in this order, a photodiode having a Pin structure is formed.

A gate electrode 31 is formed on the support 25 in the TFT region 26, and an SiNx layer 32 extending from the PD region 27 is laminated on the gate electrode 31. An a-Si layer 33 is stacked on the SiNx layer 32 on the TFT region 26, and a drain electrode 35 and a source electrode 36 are formed on the a-Si layer 33 via an n + a-Si layer 34, respectively. I have. Further, on the drain electrode 35 and the source electrode 36,
The first region is divided so as to separate the TFT region 26 and the PD region 27.
Is laminated.

On the first polyimide resin layer 41,
A metal electrode 42 is provided to electrically connect the transparent electrodes 40 in the PD region 27 adjacent to the polyimide resin layer 41.
Is provided. On the transparent electrode 40 and the metal electrode 42, a second polyimide resin layer 43 is laminated. On the second polyimide resin layer 43, the transparent protective film 30, the phosphor 29, and the light reflecting layer 28 are formed. Are sequentially stacked.

In such a solid-state flat panel detector 5, the light reflection layer 28 totally reflects visible light of visible light and X-rays radiated from the outside, and captures only X-rays. Phosphor 2
9 converts the X-rays captured by the light reflecting layer 28 into visible light and irradiates the PD area 27 with the visible light.

As a result, the charge corresponding to the visible light corresponding to the dose of X-rays is stored in the storage capacitor provided in the PD region 27 as described above, and this charge is stored in the TFT.
The data is read out in accordance with the on / off control of the TFT 12 in the region 26 and supplied to a monitor device or the like.

Next, the operation of the X-ray diagnostic apparatus of the first embodiment having such a configuration will be described.

First, when placing the patient on the couch 1, the operator operates the operation unit to support the descent of the couch 1. When this support is performed, the control unit controls the moving mechanism to lower the bed 1. Thereby, the solid flat panel detector 5 provided in the bed 1 as shown in FIG.

As described above, since the solid-state flat panel detector 5 is composed of a plurality of X-ray detecting elements, it is very thin and small. For this reason, the bed 1 is not obstructed from descending, and the bed 1 can be lowered close to the floor as shown in FIG. 1A. Getting on and off the vehicle can be facilitated.

Next, when the operator places the patient on the couch 1 in this manner, the operator operates the operation unit to support the ascending of the couch 1 and to support the execution of imaging. When the support is performed, the control unit controls the moving mechanism to control the bed 1.
Is controlled to rise, and thereafter, the X-ray tube 3 is controlled for irradiation. Thereby, as shown in FIG. 1B, X-rays are emitted to a desired site of the patient placed on the bed 1. And this X
An X-ray image formed by the irradiation of the line is captured by the solid-state flat panel detector 5 and displayed on a monitor device.

As described above, since the X-ray diagnostic apparatus can lower the bed 1 greatly, the X-ray tube 3 can be moved without providing a special mechanism for moving the X-ray tube 3 up and down.
And the solid-state flat panel detector 5 can have a sufficient distance. For this reason, it is possible to easily perform chest imaging or the like that requires the distance for imaging.

The solid-state flat panel detector 5 electrically reads out the electric charges formed by the respective X-ray detection elements according to the X-ray image, and scans the electron beam like an image intensifier. Since a display image is not required, a clear display image can be obtained without generating a geometrical or magnetic distortion in the display image.

Since the detection surface of the solid-state flat panel detector 5 is rectangular, a rectangular display image can be displayed on the display screen of the monitor device, and the display image has a shape suitable for human body observation. Can be displayed. Therefore,
It can greatly contribute to treatment plans by doctors and the like.

Here, the X-ray diagnostic apparatus is capable of enlarging and displaying a display image by controlling the bed 1 up and down by the moving mechanism.

More specifically, the X-ray emitted from the X-ray tube 3 is a so-called cone beam in which the emission range gradually widens as the distance from the focal point increases. For this reason,
As shown in FIGS. 1B and 1C, the bed 1 is controlled to move up and down by the moving mechanism, so that the diameter A1 of the X-ray irradiation range at the center of the subject and the corresponding solid flat panel detector 5 and the ratio of the X-ray exposure range A2 changes, and the change in the ratio between the two is directly reflected in the enlargement ratio of the display image.

That is, the magnification of the displayed image is “M”, the diameter of the X-ray irradiation range at the center of the subject is “A1”,
Assuming that the diameter of the irradiation range of the X-rays on the solid-state flat panel detector 5 corresponding to this is “A2”, the magnification ratio M is M = A2 / A1.

This indicates that when the couch 1 is controlled to be raised, the displayed image is enlarged because the diameter A1 of the X-ray irradiation range at the center of the subject is reduced, and when the couch 1 is controlled to be raised, the center of the subject is controlled. This indicates that the display image is reduced because the diameter A1 of the X-ray irradiation range becomes larger. Therefore,
The operator can obtain a display image with a desired enlargement ratio only by operating the bed 1 up and down, and the treatment plan by the doctor or the like can be further facilitated.

Next, when the bed 1 is controlled to move up and down to change the enlargement ratio, there is a concern that X-rays may be emitted to a part other than the image actually displayed as the display image. You. For this reason, the X-ray diagnostic apparatus is provided with an X-ray aperture unit 7, and a control unit (not shown) controls the X-ray diagnostic unit so that the X-ray is not irradiated to a part that is not reflected on the display image of the subject. The aperture 7 is controlled to open and close to control the X-ray exposure range.

Specifically, the relationship between the elevating state of the bed 1 and the X-ray exposure range in each elevating state is detected in advance.
The detection result is tabulated (opening / closing control table) and stored as, for example, opening / closing control data indicating the opening / closing width of the X-ray aperture unit 7. For this reason, when the bed 1 is controlled to move up and down, the control unit reads the corresponding opening / closing control data from the opening / closing control table according to the up / down state of the bed 1.
The opening / closing width of the X-ray aperture unit 7 is controlled based on the opening / closing control data.

Thus, even when the magnification is changed, it is possible to prevent the inconvenience of unnecessarily exposing the X-ray to a portion that is not reflected on the display image of the subject. For this reason,
The radiation exposure of the patient can be reduced, and the safety and reliability of the X-ray diagnostic apparatus can be improved.

Next, an X-ray diagnostic apparatus according to a second embodiment of the present invention will be described.

In the X-ray diagnostic apparatus of the first embodiment, the solid flat panel detector 5 moves up and down together with the bed 1. However, the X-ray diagnostic apparatus of the second embodiment is The plane detector 5 can be moved up and down independently of the bed 1.

Since the second embodiment differs from the first embodiment only in this point, the same operation as that of the first embodiment will be described in the following description of the second embodiment. The same reference numerals are given to the portions, and the detailed description thereof will be omitted.

That is, in the X-ray diagnostic apparatus according to the second embodiment, as shown in FIG. 4 (a), the solid flat panel detector 5 provided in the bed 1 is lifted and lowered separately from the bed 1. It has a driving unit 50.

More specifically, the lifting drive unit 50 is configured by fixing one piece of a pair of hinge-shaped lifting mechanisms 52 and connecting the other piece to the solid-state flat panel detector 5. The lifting mechanism 52 and the solid flat panel detector 5 are each
A bellows-like bellows cover 51 that expands and contracts according to the bending state
The vertical movement of the solid flat panel detector 5 prevents the patient's clothes and the like from being involved.

Next, the operation of the X-ray diagnostic apparatus according to the second embodiment having such a configuration will be described.

First, the operator lowers the bed 1 to a position near the floor and places the patient on the bed in the same manner as described above, then raises the bed 1 to a desired height and performs an X-ray exposure operation. . Thus, a display image of a desired part of the patient can be obtained on the display screen of the monitor device as described above.

Here, when the operator who sees the display image wants to change the enlargement ratio of the display image, he operates the operation unit to support the enlargement or reduction of the display image. Each lifting mechanism 52
When the operator supports the enlargement of the displayed image, the solid flat panel detector 5 is controlled to descend to separate from the subject,
When the operator supports the reduction of the displayed image, the solid flat panel detector 5 is controlled to move up to approach the subject.

More specifically, since the X-rays emitted from the X-ray tube 3 are so-called cone beams, the spread of the X-rays increases as the distance from the focal point of the X-ray tube 3 increases.
As shown in (a), the X-ray having the diameter of A1 spread at the center of the human body has a larger diameter of A2 on the detection surface of the solid flat panel detector 5 than the diameter of A1. .

In this state, when the elevation of the solid flat panel detector 5 is controlled by each lifting mechanism 52, as shown in FIG. 4B, the solid flat panel detector 5 is moved in the direction in which the X-ray cone beam converges (X-ray X-rays having a B1 (= A1) diameter spread at the center of the human body, the X-rays on the detection surface of the solid-state flat panel detector 5 are moved to the A direction.
B2 has a smaller diameter spread than that of B2.

Accordingly, the position of X-ray exposure to the human body does not change (A1, B1). However, since the detection range of this X-ray image is narrowed by the elevation control of the solid-state flat panel detector 5,
The display image is reduced and displayed.

On the contrary, the solid-state flat panel detector 5 is changed to the state shown in FIG.
4A, the X-ray image is detected at the position of the diameter of A2 where the X-ray cone beam is wider than the diameter of B2 as shown in FIG. It will be displayed enlarged.

Such an enlargement factor can be defined by the following equation.

That is, since the X-ray tube 3 is fixed as described above, the distance “L2” from (the focal point of) the X-ray tube 3 to the center of the patient's body as shown in FIG. It is constant unless the bed 1 is controlled to move up and down. Then, the distance “L1” from the X-ray tube 3 to the solid-state flat panel detector 5 is changed by the elevation control of the solid-state flat panel detector 5. Therefore, the enlargement ratio “M” is M = L1 / L2 (L2 is constant).

As described above, the X-ray diagnostic apparatus according to the second embodiment can change the enlargement ratio of the displayed image by controlling the elevation of the solid-state flat panel detector 5 by each elevating mechanism 52. For this reason, for example, when it is desired to enlarge and display the affected part, it is possible to obtain a display image of a desired magnification without controlling the bed 1 to move up and down, which can greatly contribute to accurate and prompt diagnosis and treatment. The same effect as the X-ray diagnostic apparatus according to the first embodiment can be obtained.

In the X-ray CT apparatus according to the second embodiment, as in the X-ray diagnostic apparatus according to the first embodiment, the magnification is changed by controlling the bed 1 to move up and down. be able to. The control unit controls the opening and closing of the X-ray aperture unit 7 in response to the elevation control of the bed 1 or the elevation control of the solid flat panel detector 5, so that the exposure to the subject can be reduced. .

Next, an X-ray diagnostic apparatus according to a third embodiment of the present invention will be described.

In the X-ray diagnostic apparatus according to the second embodiment described above, the solid-state flat panel detector 5 is maintained with the X-ray tube 3 fixed.
The X-ray diagnostic apparatus according to the third embodiment controls the elevation of the X-ray tube 3 together with the elevation of the solid-state flat panel detector 5 so that the X-ray tube 3 and the solid plane Detector 5
The magnification of the displayed image can be changed while maintaining the distance between the displayed image and the image.

Since the third embodiment differs from the second embodiment only in this point, the same operation as that of the second embodiment will be described in the following description of the third embodiment. The same reference numerals are given to the portions, and the detailed description thereof will be omitted.

That is, in the X-ray diagnostic apparatus according to the third embodiment, as shown in FIG. 5A, an X-ray tube elevating mechanism for controlling the X-ray tube 3 to move up and down along the X-ray tube support 4 have.

In the X-ray diagnostic apparatus according to the third embodiment, it is supported that the operator changes the magnification of the displayed image while maintaining the distance between the X-ray tube 3 and the solid flat panel detector 5. Then, the X-ray tube elevating mechanism is linked to the elevating control of each elevating mechanism 52 of the solid flat panel detector 5 so that the distance between the X-ray tube 3 and the solid flat panel detector 5 is maintained. The X-ray tube 3 is moved up and down.

Here, in the X-ray diagnostic apparatus according to the second embodiment, since the X-ray tube 3 is fixed, the enlargement ratio is reduced by controlling the solid-state detector 5 to be lowered, and the solid-state Although the magnification is increased by controlling the elevation of the detector 5, the X-ray diagnostic apparatus according to the third embodiment controls the X-ray tube 3 in accordance with the elevation control of the solid-state flat detector 5. Therefore, the magnification is increased by controlling the X-ray tube 3 and the solid-state flat panel detector 5 to move down, and the magnification is reduced by controlling the X-ray tube 3 and the solid-state flat panel detector 5 to move up. ing.

That is, as shown in FIG. 5 (a), for example, an X-ray cone beam having a diameter of A1 at the center of the human body and having a diameter of A2 at the detection surface of the solid flat panel detector 5 is detected by a solid flat panel detector. When the detector 5 is controlled to be lowered, the X-ray tube 3 is controlled to be lowered so as to maintain the initial distance between the X-ray tube 3 and the solid flat panel detector 5, so that the human body is located at a position where the X-ray cone beam is narrowed. 5B, the diameter at the detection surface of the solid flat panel detector 5 is not different from the diameter of B2 (= A2) as shown in FIG. It will be reduced to the diameter of B1.

This means that the range of X-ray exposure to the human body is narrowed, but this X-ray image is detected in the same range as before the narrowing, so that the display image is enlarged and displayed. .

Conversely, when the X-ray tube 3 and the solid-state flat panel detector 5 are controlled to rise from the position shown in FIG. 5B, the center of the human body is located at a position where the X-ray cone beam spreads. As shown in FIG. 5A, the diameter on the detection surface of the solid flat panel detector 5 is not different from the diameter of A2 (= B2), but the diameter of the center of the human body is expanded to the diameter of A1.

This means that the range of X-ray exposure to the human body is widened, but this X-ray image is detected in the same range as before the spread, so that the display image is reduced and displayed. .

Such an enlargement ratio can be defined by the following equation.

In this case, since the X-ray tube 3 is controlled to move up and down in accordance with the elevation control of the solid-state flat panel detector 5, the distance "L1" between the X-ray tube 3 and the solid-state flat panel detector 5 is always constant. Yes,
Distance “L2” between (the focal point of) X-ray tube 3 and the center of the patient
Only changes. Therefore, the enlargement ratio “M”
Is M = L1 / L2 (L1 is constant).

As described above, in the X-ray diagnostic apparatus of the third embodiment, the X-ray tube 3 and the solid-state flat detector 5 By controlling the elevation of the X-ray tube 3 so as to maintain the distance between, the magnification of the display image can be changed. Therefore, the same effects as those of the X-ray diagnostic apparatuses according to the first and second embodiments can be obtained.

In the X-ray CT apparatus according to the third embodiment, as in the X-ray diagnostic apparatus according to the first embodiment, the magnification is changed by controlling the bed 1 to move up and down. be able to. The control unit controls the opening and closing of the X-ray aperture unit 7 in response to the elevation control of the bed 1 or the elevation control of the solid flat panel detector 5, so that the exposure to the subject is reduced. is there.

Next, an X-ray diagnostic apparatus according to a fourth embodiment of the present invention will be described.

In the X-ray diagnostic apparatus according to the third embodiment, the X-ray tube 3 is controlled to move up and down in a direction perpendicular to the floor. The diagnostic apparatus radiates X-rays to a patient obliquely by controlling the rotation of the X-ray tube support 4 to enable oblique imaging.

Since the fourth embodiment differs from the third embodiment only in this point, the same operation as that of the third embodiment will be described in the following description of the fourth embodiment. The same reference numerals are given to the portions, and the detailed description thereof will be omitted.

That is, the X-ray diagnostic apparatus according to the fourth embodiment supports the X-ray tube 3 so as to emit X-rays vertically to a patient as shown in FIG. The X-ray tube support 4 has a rotation control mechanism for controlling the rotation so that X-rays are emitted obliquely to the patient.

In the X-ray diagnostic apparatus according to the fourth embodiment, when an operator sets an X-ray exposure angle when obliquely photographing an image, the rotation control mechanism operates as indicated by an arrow in FIG. As shown, the rotation of the X-ray tube support 4 (and the X-ray tube 3) is controlled.

More specifically, the X-ray irradiation angle is determined based on the X-ray irradiation angle perpendicular to the patient.
For example, an exposure angle of about ± 80 degrees can be set. When the operator designates the irradiation angle, the rotation control mechanism controls the rotation of the X-ray tube support 4. At this time, each lifting mechanism 52 of the lifting drive unit 50 is configured as shown in FIG.
As shown in (b), the position of the solid-state flat panel detector 5 is controlled so as to detect the X-ray irradiated at this irradiation angle substantially vertically.

As a result, oblique photographing can be performed, and a tomographic image of a body can be obtained. FIG.
As shown in (a), when the X-ray is irradiated perpendicularly to the patient, the diameter of the X-ray cone beam at the center of the human body is A.
In contrast, the X-ray cone beam is obliquely exposed to the human body during oblique photographing, so that the diameter at the center of the human body is A as shown in FIG. The diameter of B can be made larger than the diameter of B. By detecting this X-ray vertically by the solid-state flat panel detector 5,
A large field of view can be obtained at the same magnification as when the line is irradiated, and the same effects as in the above-described embodiments can be obtained.

In the X-ray CT apparatus according to the fourth embodiment, as in the X-ray diagnostic apparatus according to the first embodiment, the magnification is changed by controlling the bed 1 up and down. be able to. The X-ray aperture unit 7 is controlled to open and close by the control unit in response to the elevation control of the bed 1 or the elevation control of the solid flat panel detector 5 and the X-ray tube 3 to reduce the exposure to the subject. Of course, it can be done.

Finally, in the description of each of the above embodiments,
Although the detection surface of the solid flat panel detector 5 is rectangular, it may have any shape such as a circular shape. The solid-state flat panel detector 5 is of a charge readout type that accumulates charges according to the dose of X-rays and reads out the charges. However, the solid-state detector 5 forms a voltage corresponding to the dose of X-rays. May be of a voltage read type. In addition, although the patient is placed on the bed 1 to perform imaging, the imaging may be performed while the patient is standing. Furthermore, the solid-state flat panel detector 5 once converts the irradiated X-rays into visible light,
This is a so-called indirect conversion type solid-state flat detector, which accumulates charges corresponding to the amount of visible light in a photodiode and reads them out, but this does not convert the irradiated X-rays into visible light. Alternatively, a solid state detector of a direct conversion type that directly converts to electric charge may be used.

The above embodiments are merely examples of the present invention. Therefore, the present invention is not limited to the above embodiments, and various changes can be made according to the design and the like within a range not departing from the technical idea according to the present invention. Of course.

[0091]

According to the X-ray diagnostic apparatus of the present invention, the bed can be lowered significantly. For this reason, the patient can easily get on and off the bed. Also,
A sufficient distance can be provided between the X-ray generating means and the solid-state flat panel detector, and chest imaging or the like requiring the distance can be easily performed.

Further, the bed can be lowered significantly by using the existing mechanism for raising and lowering the bed as it is. Therefore, it is not necessary to provide a special new mechanism for this purpose. Low cost can be achieved.

Further, since the solid-state flat panel detector is used as the X-ray detecting means, a display image free from geometrical and magnetic distortions can be obtained.
By making the line detection surface rectangular, a display image having a shape suitable for observation of a human body can be obtained, which can greatly contribute to a doctor's treatment plan and the like.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an X-ray diagnostic apparatus according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a solid-state flat panel detector provided in the X-ray diagnostic apparatus according to the first embodiment.

FIG. 3 is a partial cross-sectional view of the solid-state flat panel detector.

FIG. 4 is a schematic diagram of an X-ray diagnostic apparatus according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a modification of the X-ray diagnostic apparatus according to the second embodiment.

FIG. 6 is a diagram for explaining oblique incidence imaging in the X-ray diagnostic apparatus according to the second embodiment.

FIG. 7 is a schematic diagram of a conventional overtube X-ray diagnostic apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bed, 2 ... Bed support, 3 ... X-ray tube, 4 ... X-ray tube support, 6 ... Support base 5 ... Solid plane detector, 50 ... Lifting drive part of a solid plane detector 51 ... Bellows cover, 52 ... Lifting mechanism

Claims (8)

[Claims] 1. A bed on which a subject is placed, X-ray generating means for irradiating the subject placed on the bed with X-rays so as to be an overtube, and the X-ray An X-ray image formed by transmitting X-rays emitted from the X-ray generation unit through a subject is provided below the bed surface of the couch so as to face the generation unit. A solid-state flat panel detector for detecting with a plurality of solid-state detection elements arranged in a three-dimensional manner; and a moving unit for moving the bed and the solid-state flat panel detector in a direction approaching and moving away from the subject. An X-ray diagnostic apparatus comprising: 2. The apparatus according to claim 1, further comprising: detector moving means for moving the solid flat panel detector in a direction approaching the subject and in a direction away from the subject independently of the bed. X-ray diagnostic apparatus. 3. The apparatus according to claim 1, further comprising an X-ray generation unit moving means for moving the X-ray generation means in a direction approaching the solid-state flat panel detector and in a direction away from the solid-state flat panel detector. Item 3. An X-ray diagnostic apparatus according to Item 2. 4. The X-ray generating means, wherein when the solid-state flat detector is moved by the detector moving means, the X-ray generating means has the same moving amount as the solid flat-surface detector.
The X-ray diagnostic apparatus according to claim 3, wherein the X-ray generating means is moved. 5. The apparatus according to claim 1, further comprising rotating means for rotating said X-ray generating means so as to irradiate said subject placed on said bed with X-rays obliquely. Item 5. The X-ray diagnostic apparatus according to any one of Items 4. 6. The solid-state imaging device according to claim 1, wherein when the X-ray generation unit is rotated by the rotation unit, the rotated X-ray generation unit and an X-ray image detection surface of the solid-state flat panel detector face each other. 6. The X-ray diagnostic apparatus according to claim 5, further comprising a position setting means for setting a position of the plane detector. 7. The apparatus according to claim 1, wherein the X-ray generation unit controls the movement of the bed and / or the solid flat panel detector so that X-rays are not emitted to a part of the subject that is not reflected on a display image. 7. An apparatus according to claim 1, further comprising an X-ray aperture unit for controlling an X-ray irradiation range.
An X-ray diagnostic apparatus according to the item. 8. The X-ray diagnostic apparatus according to claim 1, wherein an X-ray image detection surface of the solid-state flat panel detector has a rectangular shape.