JP2003024327A - X-ray diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray diagnostic device in which the positional relation of an X-ray irradiation source and the concerned site of a subject are constantly fixed when the top plate is tilted in the X-ray diagnostic device in which the top plate for mounting the subject is tilted with respect to an X-ray system. SOLUTION: By detecting the tilt angle of the top plate 1 when it is tilted, a control part 4 calculates a correction value according to the tilt angle. By performing movement in the longitudinal direction and vertical direction of the top plate 1 while synchronizing the tilting of the top plate 1 based on the correction value, the concerned site Q of the subject is given the correction of positional deviation.

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 for performing fluoroscopy and imaging inside a subject by X-ray exposure, and is particularly used for an X-ray contrast examination utilizing gravity. Related X-ray diagnostic apparatus.

[0002]

2. Description of the Related Art In general, when performing X-ray photography, it is often necessary to make appropriate diagnoses, so that it is often necessary to obtain images of a region of interest to be diagnosed from multiple directions. Therefore, in the conventional X-ray diagnostic apparatus, the top plate on which the patient (subject) P is placed in order to perform X-ray imaging from various directions on the subject performs X-ray irradiation. Some exist that are configured to move up and down with respect to the line system (see FIG. 8).

The X-ray diagnostic apparatus shown in FIG. 8 mainly comprises a table 1 on which a patient is placed, a bed 2 which is a means for driving the table 1, and a subject P to be irradiated with X-rays. X-ray tube 3a
And an X-ray system 3 including an X-ray detector 3b for detecting X-rays transmitted from the subject P. The bed 2 is a driving means for the top plate 1, and is configured to be capable of moving the top plate 1 in the vertical direction and moving it in the longitudinal direction (the direction of the broken line arrow shown in the figure) in addition to the up and down movement of the top plate 1. ing. Further, the X-ray system 3 is capable of rotatably moving about the site of interest Q according to the tilting angle of the top plate 1 so that the X-ray beam is always emitted perpendicularly to the top plate surface of the top plate 1. It is configured.

[0004]

However, in the X-ray diagnostic apparatus in which the top 1 is moved up and down with respect to the X-ray system 3, the interest of the subject P is increased as the top 1 is moved up and down. The positional relationship between the part Q and the X-ray irradiation source R, which is the X-ray irradiation center of the X-ray tube 3a, is displaced.

As shown in FIG. 9, in the X-ray diagnostic apparatus, when the tabletop 1 is tilted and tilted by a tilting angle θ, the region of interest Q is moved from Q ₁ to Q ₂ and the X-ray is detected. It is assumed that the X-ray irradiation source R, which is the X-ray irradiation center of the tube 3a, moves from R ₁ to R ₂ . At this time, the region of interest Q _{2 after} being tilted is displaced from the region of interest Q ₁ before being tilted by a movement amount A in the horizontal direction and a movement amount B in the vertical direction.

As described above, when the top plate 1 moves up and down,
The X-ray irradiation source R is R shown in FIG. ₁To R_TwoHetoseki
Heart part Q₁Since the rotation movement is centered around
X-ray irradiation source R_TwoAnd the part of interest Q after the fall_TwoX-ray beam
The position is displaced by A ″ in the horizontal direction with respect to the center, and X
The position is displaced by B ″ in the vertical direction with respect to the center of the line beam.
Occurs (see FIG. 9).

As described above, when the top plate 1 is moved up and down and the position of interest Q is displaced from the X-ray irradiation source R in the horizontal direction with respect to the center of the X-ray beam, the image is displayed on the monitor screen. The photographed image of the region of interest Q moves in the circumferential direction from the center of the screen, and particularly when this positional deviation is large, there is a problem that the region of interest Q deviates from the monitor screen. Further, if the region of interest Q is displaced from the X-ray irradiation source R in the vertical direction with respect to the center of the X-ray beam, an error may occur in the magnification of the photographed image of the region of interest Q displayed on the monitor screen. become. In particular, when the positional deviation is large, the error of the enlargement factor becomes very large, and the operator feels troublesome during the diagnosis.

Therefore, in the conventional X-ray diagnostic apparatus,
In order to correct the positional deviation of the region of interest Q (A ″ and B ″ shown in FIG. 9) due to the up and down movement of the top plate 1, the correction described below is performed.

First, the displacement of the region of interest Q is corrected by moving the top plate 1 of the bed 2 in the vertical direction (movement amount B '). As shown in FIG. 9, the region of interest Q moves from Q ₂ to Q ₃ shown in the figure by the vertical movement of the top plate 1, and along with this, a horizontal positional shift (movement) with respect to the X-ray beam center. The amount A ″) is improved, and the vertical position shift (movement amount B ″) with respect to the X-ray beam center is improved.
Is corrected.

The amount of movement B'of the top plate 1 in the vertical direction is the height H of the region of interest Q from the top surface of the top plate 1 and the horizontal amount of the region of interest Q from the tilting center O of the top plate 1. Distance L
If it is recognized, it is a value that is uniquely calculated according to the tilt angle θ of the top 1 (the calculation formula will be described in detail in the first embodiment). Among X-ray diagnostic apparatuses, there is an X-ray diagnostic apparatus that automatically corrects the positional deviation of the site of interest Q due to the vertical movement of the tabletop 1 in synchronization with the up and down movement of the tabletop 1.

As described above, by correcting the positional deviation by moving the top plate 1 in the vertical direction, the horizontal positional deviation (movement amount A ″) with respect to the X-ray beam center of the site of interest Q is improved. However, even with the above correction, the movement amount A ′ shown in FIG.
Will appear as a misalignment of the captured image.

Therefore, when the amount of movement A'is large (when the positional deviation of the photographed image of the region of interest Q displayed on the monitor screen is a concern), the longitudinal direction of the top plate 1 of the bed 2 ( Positional deviation correction of the site of interest Q is performed by movement (in the direction of the broken line arrow shown in the figure).

The positional deviation correction by the movement of the top plate 1 in the longitudinal direction (the direction of the broken line arrow shown in the figure) is performed manually by the operator. The operator adjusts the position of the top plate 1 in the longitudinal direction so that the photographed image of the region of interest Q is located at the center of the monitor screen while confirming the position of the photographed image of the region of interest Q displayed on the monitor screen. To do. By this position adjustment, the region of interest Q becomes Q _{3 in} FIG.
To Q ₁ , and with this, the X of the region of interest Q
The horizontal positional deviation correction with respect to the line beam center is completed.

However, as described above, the displacement correction of the site of interest Q by the movement of the top plate 1 of the bed 2 in the longitudinal direction (the direction of the broken line arrow shown in the figure) is performed manually by the operator. Therefore, the operator feels annoyed and is a burden on the diagnosis.

The present invention has been made in view of the above circumstances, and an object of the present invention is to shift the positional relationship between the X-ray irradiation source and the region of interest of the subject when the top plate is moved up and down. Depending on the tilting angle of the top plate,
An object of the present invention is to provide an X-ray diagnostic apparatus that automatically adjusts the position of the top plate and / or the X-ray system.

[0016]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a top plate on which a subject is placed along the longitudinal direction, and a tilting movement and a longitudinal movement of the top plate. ,
In the X-ray diagnostic apparatus, which has a driving unit that drives the vertical movement, irradiates the subject with X-rays, detects X-rays that have passed through the subject, and performs imaging diagnosis. During operation, the top plate is moved in the up-down direction and the longitudinal direction based on the correction amount according to the tilting angle to correct the positional deviation of the region of interest of the subject.

In order to solve the above-mentioned problems, the invention according to claim 2 drives a top plate on which a subject is placed along the longitudinal direction, and tilting movement, longitudinal movement, and vertical movement of the top plate. Drive means for irradiating the subject, an X-ray system for irradiating the subject with X-rays and detecting X-rays transmitted through the subject, and a drive means for driving the vertical movement and the horizontal movement of the X-ray system. Then
In an X-ray diagnostic apparatus that irradiates the subject with X-rays and detects X-rays that have passed through the subject to perform diagnostic imaging, based on a correction amount according to a tilt angle when the top plate is tilted. The X-ray system is vertically moved and horizontally moved to correct the positional deviation of the region of interest of the subject.

In order to solve the above-mentioned problems, the invention according to claim 3 drives a top plate on which a subject is placed along the longitudinal direction, and tilting movement, longitudinal movement, and vertical movement of the top plate. Drive means for irradiating the subject, an X-ray system for irradiating the subject with X-rays and detecting X-rays transmitted through the subject, and a drive means for driving the vertical movement and the horizontal movement of the X-ray system. Then
In an X-ray diagnostic apparatus that irradiates the subject with X-rays and detects X-rays that have passed through the subject to perform diagnostic imaging, based on a correction amount according to a tilt angle when the top plate is tilted. The vertical movement and / or the longitudinal movement of the top plate and the X
It is characterized in that the displacement of the region of interest of the subject is corrected by performing vertical movement and / or horizontal movement of the line system.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding the embodiments of the X-ray diagnostic apparatus according to the present invention, the following three embodiments will be given.
This will be described in detail with reference to the drawings.

[First Embodiment] First, as a first embodiment, an X-ray diagnostic apparatus according to claim 1 of the present invention, that is, a correction amount according to a tilt angle when tilting the top plate is performed. An X-ray diagnostic apparatus that corrects the positional deviation of the region of interest of the subject by vertically moving and vertically moving the top plate based on the above will be described below.

As shown in FIG. 1, X in the present embodiment
The X-ray diagnostic apparatus mainly consists of a tabletop 1 on which a patient is placed, a bed 2 which is a means for driving the tabletop 1, and an X for the subject P.
The X-ray system 3 includes an X-ray tube 3a for irradiating X-rays, an X-ray detector 3b for detecting X-rays transmitted from the subject P, and a controller 4 for controlling these components. . The bed 2 is a driving means for the top plate 1, and in addition to the up and down movement of the top plate 1, vertical movement, longitudinal movement (dashed line arrow direction shown in the same figure), lateral direction movement (depth shown in the same figure). Direction) is configured to be possible. Also, the X-ray system 3
In order to always irradiate the X-ray beam perpendicularly to the top plate surface of the top plate 1, a region of interest Q corresponding to the tilting angle of the top plate 1
It is configured such that it can be rotated about. Also,
The X-ray system 3 may be configured to be movable in the horizontal direction so as not to interfere with the placement of the subject P on the top plate 1.

For the sake of convenience, the tilting center of the top plate 1 of the X-ray diagnostic apparatus according to the present embodiment is located on the extension line of the top plate 1 (position O in the figure). To do.

The shooting procedure will be described below with reference to FIGS. 1 and 2.

Prior to the X-ray imaging, first, the region of interest Q of the subject P is placed immediately below the X-ray irradiation source R which is the center of the X-ray irradiation surface of the X-ray tube 3a. At this time, the position adjustment of the subject P in the body width direction (depth direction in the drawing) is performed by the top plate 1.
Is performed by moving the X-ray system 3 in the horizontal direction (horizontal direction in the figure) (horizontal movement in the horizontal direction (horizontal direction in the figure)). Direction movement) (see FIG. 1). Due to this position adjustment, the regions of interest Q and X of the subject P are
The positions of the X-ray irradiation source R in the horizontal direction (the left-right direction in the figure) match, and at this time, the X-ray irradiation source R (region of interest Q)
Then, the horizontal distance L of the tilting center O of the top plate 1 is detected by a sensor (not shown) provided in the X-ray system 3.

Next, the height H of the region of interest Q of the subject P from the top surface of the top plate 1 is calculated by the following method. First, the position of the region of interest Q of the subject P is adjusted so that its height coincides with the center of rotation of the X-ray system 3 (in this way,
By matching the region of interest Q of the subject P with the center of rotation of the X-ray system 3, the positional relationship between the two can be kept constant even when the X-ray system 3 is rotationally moved. ). The position adjustment is performed by the operator vertically moving the top plate 1 under fluoroscopy. At this time, the position (height) of the top plate 1 is detected by a sensor (not shown) provided in the bed 2, and the top surface of the top plate 1 of the region of interest Q of the subject P is detected based on this position. The height H from is calculated (∵ Since the center of rotation of the X-ray system 3 is at a fixed position,
By detecting the height of the top plate 1, it is possible to uniquely calculate the distance between them, that is, the height H of the region of interest Q of the subject P from the top surface of the top plate 1. ). (See FIGS. 1 and 2).

The top plate 1 is moved up and down by the operation of the operator. As soon as the tilting movement of the tabletop 1 is started, the tilting angle of the tabletop 1 is detected by a sensor (not shown) provided in the bed 2, and the controller 4 determines the tilting angle based on the tilting angle. A correction amount (described below) is calculated (see FIGS. 1 and 2).

As shown in FIG. 3, it is assumed that the site of interest Q moves from Q ₁ to Q ₂ as the top plate 1 moves up and down (tilt angle θ). At this time, the X-ray irradiation source R and the region of interest Q are displaced by the amount of movement A in the horizontal direction and by the amount of movement B in the vertical direction. Based on the movement amount A in the horizontal direction and the movement amount B in the vertical direction, the movement amount A ′ in the longitudinal direction and the movement amount B ′ in the vertical direction of the table 1 shown in FIG.

A method of calculating the movement amount A'of the top plate 1 in the horizontal direction and the movement amount B'in the vertical direction will be described.

As shown in the figure, for example, when the tilting angle of the top plate 1 is θ, it is assumed that the region of interest Q moves from Q ₁ to Q ₂ . Here, the X-axis and Y in the direction shown in FIG.
If the axis is taken and the tilt center O of the top plate 1 is the origin, and the coordinates of the region of interest Q ₁ before the top plate 1 is tilted are defined as (x ₁ , y ₁ ), after the top plate 1 is tilted Coordinates of the region of interest Q ₂ (x ₂ ,
y ₂ ) can be expressed by the following determinant.

[0030]

[Formula 1]

Therefore, the movement amount A in the horizontal direction and the movement amount B in the vertical direction shown in the figure can be respectively expressed as follows.

[0032]

[Formula 2]

As described above, the horizontal distance between the X-ray irradiation source R and the tilting center O of the top plate 1 is L, and the height of the region of interest Q of the subject P from the top surface of the top plate 1 is H. because there, the coordinates _{x 1} and _{y 1} of the region of interest _{Q 1} is, _{respectively, x} 1 = -
It can be expressed as L, y ₁ = H.

Therefore, the above equation can be expressed as follows.

[0035]

[Formula 3]

Further, based on the movement amount A in the horizontal direction and the movement amount B in the vertical direction, the movement amount A'in the longitudinal direction of the top plate 1 and the movement amount B in the vertical direction.
′ Is calculated by the calculation formula described below.

As shown in FIG. 4, the amount of movement A'of the top plate 1 in the longitudinal direction and the amount of movement B'in the vertical direction.
Can be respectively expressed as follows.

[0038]

[Formula 4]

Therefore, in order to correct the positional deviation of the region of interest Q, the top plate 1 is moved in the longitudinal direction only to A'in a direction (upper right direction in the figure) to eliminate the positional deviation,
With respect to the vertical direction, the top plate 1 may be moved only by B'in the direction (upward direction in the drawing) in which the positional deviation is eliminated.
As a result, the region of interest Q moves from Q ₂ to Q ₁ shown in FIG. 3, and the positional deviation correction of the region of interest Q is completed.

The values of the movement amount A'in the longitudinal direction and the movement amount B'in the vertical direction of the top plate 1 are calculated by the above-described calculation formulas, and the controller 4 drives the top plate 1 by the driving means. Drive control is performed in the longitudinal direction and the vertical direction of the top plate 1 of the bed 2 (FIGS. 1 and 2).
reference).

Both the movement control in the longitudinal direction and the movement control in the vertical direction of the top plate 1 described above are both
Since the X-ray irradiation source R and the region of interest Q are synchronized with the up and down movement of the top plate 1 and at the same time,
It will always be kept in the same position.

At the same time as the above-described raising / lowering operation of the top plate 1,
X-ray irradiation is performed from the X-ray tube 3a, and the X-ray detector 3b
By further detecting the X-rays transmitted through the subject P, a captured image of the region of interest Q of the subject P is displayed on the monitor.

As described above, X according to the present embodiment.
The X-ray diagnostic apparatus can always hold a captured image of the region of interest of the subject obtained by X-ray imaging near the center of the monitor, and the captured image of the region of interest is outside the display range of the monitor. You can avoid such problems. Also,
The magnification rate when the captured image of the region of interest is displayed on the monitor,
It can be maintained at a constant value at all times. Furthermore, since the position adjustment of the top plate is automatically performed according to the tilting angle of the top plate, the operator does not need to operate the top plate, and the operator feels troublesome. Can be diagnosed without.

[Second Embodiment] Next, as a second embodiment, an X-ray diagnostic apparatus according to claim 2 of the present invention, that is, a correction amount according to the tilting angle when the tilting operation of the top plate is performed. An X-ray diagnostic apparatus for correcting the positional deviation of the region of interest of the subject by performing horizontal movement and vertical movement of the X-ray system based on the above will be described below.

As shown in FIG. 5, X in the present embodiment
The X-ray diagnostic apparatus mainly consists of a tabletop 1 on which a patient is placed, a bed 2 which is a means for driving the tabletop 1, and an X for the subject P.
X-ray system including an X-ray tube 3a for irradiating X-rays, an X-ray detector 3b for detecting X-rays transmitted from the subject P, and a drive unit 3c for driving the X-ray tube 3a and the X-ray detector 3b. Three
And a control unit 4 that controls these components. The bed 2 is a drive means for the top 1, and the top 1 is moved up and down, moved in the longitudinal direction (in the direction of the broken line arrow in the figure), in the lateral direction (in the depth direction in the figure), and in the vertical direction. It is configured to be movable. Also, the X-ray system 3
In order to always irradiate the X-ray beam perpendicularly to the top plate surface of the top plate 1, a region of interest Q corresponding to the tilting angle of the top plate 1
It is configured such that it can be rotated about. Also,
It is configured to be movable in the horizontal direction and the vertical direction.

For the sake of convenience, it is assumed that the tilting center of the top plate 1 of the X-ray diagnostic apparatus in this embodiment is located on the extension line of the top plate 1 (position O in the figure).

Hereinafter, the photographing procedure will be described with reference to FIGS. 5 and 6.

Prior to the X-ray photography, first, the region of interest Q of the subject P is placed immediately below the X-ray irradiation source R which is the center of the X-ray irradiation surface of the X-ray tube 3a. At this time, the position adjustment of the subject P in the body width direction (depth direction in the drawing) is performed by the top plate 1.
Is performed by moving the X-ray system 3 in the horizontal direction or the top plate 1 in the longitudinal direction (horizontal direction). Direction movement) (see FIG. 5). Due to this position adjustment, the regions of interest Q and X of the subject P are
The positions of the X-ray irradiation source R in the horizontal direction (the left-right direction in the figure) match, and at this time, the X-ray irradiation source R (region of interest Q)
Then, the horizontal distance L of the tilting center O of the top plate 1 is detected by a sensor (not shown) provided in the X-ray system 3.

Next, the height H of the region of interest Q of the subject P from the top surface of the top plate 1 is calculated by the following method. First, the position of the region of interest Q of the subject P is adjusted so that its height coincides with the center of rotation of the X-ray system 3 (in this way,
By making the site of interest Q of the subject P coincident with the rotation center of the X-ray system 3, the positional relationship between the two can always be kept constant even when the X-ray system 3 is rotationally moved. ). The position adjustment is performed by the operator vertically moving the top plate 1 under fluoroscopy. At this time, the sensor (not shown) provided in the bed 2 detects the position (height) of the top plate 1, and the sensor (not shown) provided in the X-ray system 3 The rotation center position (height) of the X-ray system 3 is detected, and the height H of the region of interest Q of the subject P from the top surface of the top plate 1 is calculated based on these positions (of the top plate 1). By detecting the position (height) and the position (height) of the rotation center of the X-ray system 3, the distance between the two, that is, the height of the region of interest Q of the subject P from the top surface of the top plate 1. H can be uniquely calculated.). (See FIGS. 5 and 6).

Then, the top plate 1 is moved up and down by the operation of the operator. When the up and down movement of the top plate 1 is started,
Immediately, the tilting angle of the top plate 1 is detected by a sensor (not shown) provided in the bed 2, and the control unit 4 calculates a correction amount (described below) based on the tilting angle (see below). 5 and FIG. 6).

As shown in FIG. 7, it is assumed that the region of interest Q moves from Q ₁ to Q ₂ as the top plate 1 moves up and down (tilt angle θ). At this time, the X-ray irradiation source R and the region of interest Q are displaced by the amount of movement A in the horizontal direction and by the amount of movement B in the vertical direction. The horizontal movement amount A is the horizontal movement amount of the X-ray system, and the vertical movement amount B is the vertical movement amount of the X-ray system.

A method of calculating the horizontal movement amount A and the vertical movement amount B of the X-ray system 3 will be described.

As shown in FIG. 7, the tilting angle of the top plate 1 is θ.
At this time, it is assumed that the site of interest Q has moved from Q ₁ to Q ₂ .
Here, the X axis and the Y axis are taken in the directions shown in the drawing, the origin O of the top 1 is set as the origin, and the coordinates of the site of interest Q ₁ before the top 1 is set to (x ₁ , y). ₁ ), the coordinates (x ₂ , y ₂ ) of the region of interest Q ₂ after the top plate 1 is tilted can be expressed by the following determinant.

[0054]

[Formula 5]

Therefore, the horizontal movement amount A and the vertical movement amount B of the X-ray system can be expressed as follows.

[0056]

[Formula 6]

As described above, the X-ray irradiation source R and the top plate 1
The horizontal distance of the center O of tilting is L, and the top plate 1 of the site of interest Q is
Since the height from the top is defined as H,
Rank Q ₁Coordinate x₁And y₁Are respectively x₁= -L,
y₁Can be represented as = H.

Therefore, the above equation can be expressed as follows.

[0059]

[Formula 7]

Therefore, in order to correct the positional deviation of the region of interest Q in the horizontal direction, the X-ray system 3 is moved in the horizontal direction by a movement amount A in a direction in which the error is eliminated (leftward in the figure). Of course, this completes the positional deviation correction of the region of interest Q in the horizontal direction.

Further, in order to correct the positional deviation of the region of interest Q in the vertical direction, the X-ray system 3 should be moved in the direction of eliminating the error (downward in the figure) by the amount of movement B in the vertical direction. Well, with this, the positional deviation correction of the region of interest Q in the vertical direction is completed.

According to the above-mentioned calculation formula, the X-ray system 3
When the moving amount A of the horizontal direction and the moving amount B of the vertical direction are calculated, the control unit 4 controls the X of the drive unit 3c, which is the drive means of the X-ray system 3 provided in the X-ray system 3. Drive control relating to horizontal movement and vertical movement of the line system 3 is performed (see FIGS. 5 and 6).

Since the drive control in the horizontal direction and the drive control in the vertical direction of the X-ray system 3 described above are both performed in synchronization with the up and down movement of the top plate 1 and at the same time. , The X-ray irradiation source R and the region of interest Q
Will always be kept in the same position.

At the same time as the above-described raising / lowering operation of the top plate 1,
X-ray irradiation is performed from the X-ray tube 3a, and the X-ray detector 3b
By further detecting the X-rays transmitted through the subject P, a captured image of the region of interest Q of the subject P is displayed on the monitor.

As described above, the X according to the present embodiment is
The X-ray diagnostic apparatus can always hold a captured image of the region of interest of the subject obtained by X-ray imaging near the center of the monitor, and the captured image of the region of interest is outside the display range of the monitor. You can avoid such problems. Also,
The magnification rate when the captured image of the region of interest is displayed on the monitor,
It can be maintained at a constant value at all times. Further, since the position adjustment of the X-ray system is automatically performed according to the tilting angle of the top plate, the operator does not need to operate the X-ray system, and the operator is not troublesome. Diagnosis can be done without feeling.

Further, since the X-ray diagnostic apparatus according to this embodiment is configured to adjust the positional deviation correction of the region of interest only on the X-ray system side, when the positional deviation correction of the region of interest is performed, the subject itself is corrected. No need to move.
Therefore, for example, imaging can be performed even when the condition of the subject is bad and the subject itself cannot be largely moved.

[Third Embodiment] Next, as a third embodiment, an X-ray diagnostic apparatus according to claim 3 of the present invention, that is, a correction amount according to a tilt angle when the top plate is tilted. X-ray diagnostic apparatus that corrects the positional deviation of the region of interest of the subject by performing horizontal movement and / or vertical movement of the X-ray system and vertical movement and / or longitudinal movement of the top plate based on Will be described below as an example.

The X-ray diagnostic apparatus according to the present embodiment is a combination of the X-ray diagnostic apparatus according to the first embodiment and the X-ray diagnostic apparatus according to the second embodiment described above, and therefore is not shown in the drawing. Although omitted, an example of the combination will be described below.

For example, in the X-ray diagnostic apparatus according to the present embodiment, the positional shift of the region of interest of the subject in the horizontal direction is corrected by moving the X-ray system in the horizontal direction, and the position of the region of interest in the subject in the vertical direction is corrected. It is also possible to correct the deviation by moving the top plate in the vertical direction.

Further, for example, the displacement of the region of interest of the subject in the horizontal direction is corrected by moving the X-ray system in the horizontal direction and moving the top plate in the longitudinal direction, so that the region of interest of the subject in the vertical direction is corrected. It is also possible to correct the positional deviation by moving the X-ray system in the vertical direction and moving the top plate in the vertical direction.

As described above, by performing the positional deviation correction of the region of interest of the subject by both the movement of the X-ray system and the movement of the tabletop, the correction widths of both can be used together, and for example, Even if the tilting angle of the tabletop is large, it is possible to perform sufficient correction. Further, as a matter of course, the X-ray diagnostic apparatus according to the first embodiment and the X-ray diagnostic apparatus according to the second embodiment
The effects obtained by the line diagnostic device can also be obtained.

[0072]

As described above, the X-ray diagnostic apparatus according to the present invention calculates the correction value according to the tilting angle of the tabletop,
Since the correction (position adjustment) is performed in synchronization with the up and down movement of the top plate, the photographed image of the region of interest of the subject can always be held near the center of the monitor. Therefore, it is possible to avoid the problem that the captured image of the region of interest goes out of the display range of the monitor. Further, the enlargement ratio when the photographed image of the region of interest is displayed on the monitor can always be maintained near a constant value. Furthermore, since these position adjustments are performed automatically without the need for operator's operation, the operator
Diagnosis can be performed without feeling bothersome.

The present invention also provides claims 2 and 3.
The X-ray diagnostic apparatus according to the present invention has a structure capable of adjusting the position of only the X-ray system side with respect to the positional deviation correction of the region of interest of the object. There is no need to move itself. Therefore,
For example, imaging can be performed even when the condition of the subject is bad and the subject itself cannot be moved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an X-ray diagnostic apparatus according to claim 1 of the present invention.

FIG. 2 is a flowchart showing a position adjustment process of the X-ray diagnostic apparatus shown in FIG.

FIG. 3 is an explanatory diagram for calculating a movement amount A ′ in the longitudinal direction and a movement amount B ′ in the vertical direction of the top plate.

4 is a partially enlarged view of the explanatory view shown in FIG.

FIG. 5 is a configuration diagram showing an embodiment of an X-ray diagnostic apparatus according to claim 2 of the present invention.

6 is a flowchart showing a position adjustment process of the X-ray diagnostic apparatus shown in FIG.

FIG. 7 is an explanatory diagram for calculating a horizontal movement amount A and a vertical movement amount B of the X-ray system.

FIG. 8 is a configuration diagram showing a conventional X-ray diagnostic apparatus.

FIG. 9 is an explanatory diagram showing a position adjustment process in a conventional X-ray diagnostic apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Top plate 2 ... Bed 3 ... X-ray system 3a ... X-ray tube 3b ... X-ray detector 4 ... Control unit A ... Horizontal movement amount A '... Top plate longitudinal movement amount B ... Vertical direction Amount of movement B '... Amount of movement in the vertical direction of the tabletop H ... Height of the site of interest from the top surface of the tabletop L ... Horizontal distance between the site of interest and the center of tilting the tabletop O ... Center of tabletop tilting P ... Subject Q: region of interest Q ₁ ... position of region of interest before tilting Q ₂ ... position of region of interest after tilting Q ₃ ... position of region of interest in position adjustment process R ... X-ray irradiation source R ₁ ... before tilting Position of X-ray irradiation source R ₂ ... Position of X-ray irradiation source after tilting

Continued front page    F-term (reference) 4C093 AA02 CA16 CA18 ED04 ED05                       ED06 FA36 FA43

Claims (3)

[Claims] 1. A top plate on which a subject is placed along the longitudinal direction, and drive means for driving the top plate to move up and down, longitudinally and vertically. X-ray that irradiates X-rays and detects X-rays that have passed through the subject for diagnostic imaging X
In the line diagnostic device, when the top plate is tilted, the top-bottom movement and the longitudinal movement of the top plate are performed based on the correction amount according to the tilting angle to correct the positional deviation of the region of interest of the subject. An X-ray diagnostic apparatus characterized by: 2. A top plate on which a subject is placed along the longitudinal direction, drive means for driving the top plate to move up and down, longitudinally, and vertically, and to irradiate the subject with X-rays. And has an X-ray system for detecting X-rays transmitted through the subject, and a drive means for driving the vertical movement and the horizontal movement of the X-ray system, irradiating the subject with X-rays, X passed through the sample
In an X-ray diagnostic apparatus that detects radiographs and performs imaging diagnosis, when the top plate is tilted, the X-ray system is moved vertically and horizontally based on a correction amount according to a tilt angle. An X-ray diagnostic apparatus which corrects a positional deviation of a region of interest of a subject. 3. A top plate on which a subject is placed along the longitudinal direction, drive means for driving the top plate to move up and down, longitudinally and vertically, and to irradiate the subject with X-rays. And has an X-ray system for detecting X-rays transmitted through the subject, and a drive means for driving the vertical movement and the horizontal movement of the X-ray system, irradiating the subject with X-rays, X passed through the sample
In an X-ray diagnostic apparatus that detects a line and performs imaging diagnosis, when the top plate is tilted, the vertical movement and / or the longitudinal movement of the top plate and the vertical movement of the top plate are performed based on a correction amount according to a tilt angle. An X-ray diagnostic apparatus characterized by performing vertical movement and / or horizontal movement of an X-ray system to correct a positional deviation of a region of interest of a subject.