JP7233185B2 - X-ray diagnostic device and program - Google Patents

Description

An embodiment of the present invention relates to an X-ray diagnostic apparatus and program.

In long tomosynthesis imaging, which is used in general radiography equipment, X-ray irradiation is performed while the X-ray tube is moved in parallel. Reconstruct a long tomosynthesis image with . As a result, a tomographic image of an arbitrary height (depth) in the region of interest of the subject can be generated.

By the way, the range of the reconstructed tomosynthesis image is smaller than the range in which the subject is actually irradiated with X-rays. That is, since the number of projection images required for reconstruction cannot be obtained at the ends of the movement range of the X-ray tube, X-ray irradiation at the ends of the movement range of the X-ray tube causes unnecessary exposure to the subject.

JP-A-2009-82370

The problem to be solved by the present invention is to acquire a wide range of images while reducing unnecessary exposure.

An X-ray diagnostic apparatus according to an embodiment includes an X-ray tube, an X-ray detector, an X-ray tube moving mechanism, and an X-ray tube tilting mechanism. The X-ray tube emits X-rays. The X-ray detector detects X-rays emitted by the X-ray tube. The X-ray tube moving mechanism relatively translates the X-ray tube with respect to the top plate on which the subject is placed. The X-ray tube tilting mechanism changes the tilting angle of the X-ray tube with respect to the X-ray detector in at least one of the range before and after the range in which the X-ray tube is translated by the X-ray tube moving mechanism. The X-ray tube is tilted relative to the subject.

1 is a block diagram showing the configuration of an X-ray diagnostic apparatus according to an embodiment; FIG. FIG. 4 is an explanatory diagram illustrating a state of X-ray irradiation to a subject when long tomosynthesis imaging is performed by the X-ray diagnostic apparatus according to the embodiment; 4 is a flowchart showing an example of long tomosynthesis imaging according to the embodiment; FIG. 10 is an explanatory diagram for explaining the state of X-ray irradiation to a subject when long tomosynthesis imaging is performed by moving the X-ray tube linearly along the body axis of the subject (comparative example).

An X-ray diagnostic apparatus according to an embodiment will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the X-ray diagnostic apparatus 10 is composed of an imaging device 11 and a console device 12 . An operator operates the imaging device 11 via the console device 12 . Here, the longitudinal direction of the top plate 18 is the z-axis direction, the short direction of the top plate 18 perpendicular to the z-axis direction is the x-axis direction, and the axial direction perpendicular to the top plate 18 is the x-axis direction. The y-axis direction shall be defined respectively.

The imaging device 11 includes an X-ray tube 13, an X-ray detector 14, a bed device 15, an X-ray tube moving mechanism 16, and an X-ray tube tilting mechanism 17 (17a, 17b).

The X-ray tube 13 includes an X-ray source that generates X-rays by a voltage applied by a high-voltage generator (not shown), and an X-ray movable diaphragm for adjusting the irradiation field of the X-rays generated by the X-ray source. , provided.

The X-ray tube 13 is supported above a tabletop 18 by an X-ray tube moving mechanism 16 and irradiates an object placed on the tabletop 18 with X-rays.

The X-ray detector 14 is mounted inside the bed device 15 and arranged at a position facing the X-ray tube 13 . Also, the X-ray detector 14 is mounted in the bed device 15 so as to be movable in the longitudinal direction (z-axis direction) of the top plate 18 according to the position of the X-ray tube 13 .

The X-ray detector 14 is configured by, for example, an FPD (Flat Panel Detector). The X-ray detector 14 detects X-rays irradiated by the X-ray tube 13 and transmitted through the subject. The X-ray detector 14 outputs an X-ray detection signal to the console device 12 .

The bed device 15 has a top board 18 and a bed body 19 . The top board 18 is supported by the bed main body 19 and is a planar board on which the subject is placed. The bed main body 19 may support the top plate 18 so as to be movable in its longitudinal direction or lateral direction. Further, the bed apparatus 15 may tilt the bed main body 19 together with the top plate 18 and the X-ray detector 14 . The bed device 15 includes a motor as a drive source for moving the top plate 18 along the longitudinal direction and the width direction of the top plate 18 and for raising and lowering the bed main body 19, and an electronic device for controlling the motor. have parts, etc.

The X-ray tube moving mechanism 16 relatively translates the X-ray tube 13 with respect to the top plate 18 on which the subject is placed. The X-ray tube moving mechanism 16 maintains the oblique angle of the X-ray tube 13 constant, and moves the X-ray tube 13 with respect to the top plate 18 in the longitudinal direction (z-axis) while maintaining the distance from the subject. direction).

In the following description, the range of movement of the X-ray tube 13 by the X-ray tube moving mechanism 16 is called "movement range of the X-ray tube 13". The movement range of the X-ray tube 13 is a range along a predetermined linear movement direction. For example, the X-ray tube moving mechanism 16 translates the X-ray tube 13 with respect to the body axis direction (z-axis direction) of the subject. Note that the X-ray tube moving mechanism 16 may move the X-ray tube 13 parallel to the horizontal axis direction (x-axis direction) of the subject. Note that the X-ray tube moving mechanism 16 moves the top plate 18 along the z-axis direction so that the position of the X-ray tube 13 relative to the top plate 18 is translated along the z-axis direction. good. Further, the X-ray tube moving mechanism 16 moves the position of the X-ray tube 13 relative to the top plate 18 in parallel along the z-axis direction by combining the movement of the X-ray tube 13 and the movement of the top plate 18 . may

The X-ray tube tilting mechanism 17 (17a, 17b) moves the X-ray tube 13 outside the moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16 while changing the tilting angle of the X-ray tube 13 with respect to the X-ray detector 14. The X-ray tube 13 is moved relative to the top plate 18 on which the specimen is placed. The X-ray tube tilting mechanism 17 relatively tilts the X-ray tube 13 with respect to the top plate 18 on which the subject is placed. Here, two X-ray tube tilting mechanisms 17 a and 17 b are connected to both ends of the X-ray tube moving mechanism 16 . In FIG. 1, the X-ray tube tilting mechanisms 17a and 17b are provided substantially adjacent to each other before and after the maximum range in which the X-ray tube 13 can be mechanically translated by the X-ray tube moving mechanism 16. I gave an example.

More specifically, the X-ray tube tilting mechanism 17a moves the moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16 from one end of the moving range in the linear moving direction (in the example shown in FIG. ) on the outside (in the example shown in FIG. 1, the left side of the paper surface). On the other hand, the X-ray tube tilting mechanism 17b is positioned outside the other end of the moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16 in the direction of linear movement of the moving range (the right side of the drawing in the example shown in FIG. 1). located second outer area.

The movement trajectory of the X-ray tube 13 by the X-ray tube tilting mechanism 17a (17b) is, for example, outside the linear movement direction of the movement range of the X-ray tube 13 from one end (the other end) of the movement range of the X-ray tube 13. It has a shape that bends toward the top plate 18 while extending (see FIG. 1).

The two X-ray tube tilting mechanisms 17a and 17b may be configured to transfer the X-ray tube 13 at both ends of the moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16. It is not necessary to have a configuration in which it is connected to both ends of the . Also, one of the two X-ray tube tilting mechanisms 17a and 17b may be omitted.

The X-ray tube tilting mechanism 17 may tilt the X-ray tube 13 relative to the top plate 18 by tilting the top plate 18 together with the bed main body 19 . The X-ray tube tilting mechanism 17 may tilt the X-ray tube 13 relative to the top plate 18 by combining movement of the X-ray tube 13 and tilting of the bed body 19 .

Furthermore, the imaging device 11 may include a support arm that supports the X-ray tube 13 so as to be relatively movable with respect to the top plate 18 . In this case, the X-ray tube moving mechanism 16 has a mechanism for supporting the X-ray tube 13 so as to be able to move in parallel relative to the top plate 18, and the X-ray tube tilting mechanism 17 has a range of parallel movement. It has a mechanism that supports the X-ray tube 13 so that it can be tilted relative to the top plate 18 on a track that extends outward and bends toward the top plate 18 .

For example, one end of the support arm is rotatably supported by a rail provided on the bed main body 19 , and the other end supports the X-ray tube 13 . In the following description, it is assumed that the main axis of the X-ray irradiation axis of the X-ray tube 13 is fixed parallel to the arm main axis of the support arm.

First, the operation of the X-ray tube moving mechanism 16 when using the support arm will be described. Taking the case of moving the X-ray tube 13 parallel to the longitudinal direction (z-axis direction) of the top plate 18 using a rail as an example, the rail is fixed to the bed body 19 along the z-axis direction. should be installed. This rail supports one end of the support arm for movement in the z-axis direction.

In this example, in a normal state, the support arm stands upright along the y-axis direction (perpendicular to the top plate 18), and the X-ray irradiation axis of the X-ray tube 13 is also parallel to the y-axis. do. Under the control of the X-ray imaging control function 211, the X-ray tube 13 provided at the other end of the support arm moves one end of the support arm in the z-axis direction along the rail while the support arm stands upright. , the top plate 18 can be translated in the longitudinal direction (z-axis direction). At this time, the X-ray detector 14 is moved according to the position of the X-ray tube 13 under the control of the X-ray imaging control function 211 . In addition, when the X-ray detector 14 is a long detector, it is not necessary to move the X-ray detector 14 .

Next, the operation of the X-ray tube tilting mechanism 17 when using the support arm will be described. In this example, one end of the support arm is rotatably supported on the rail of the bed body 19 about the one end. If rails along the z-axis direction are provided on the bed body 19, the rotation axis of one end of the support arm should be parallel to the x-axis direction. In this case, the X-ray tube 13 provided at the other end of the support arm rotates around the one end in the yz plane as the one end of the support arm rotates. Therefore, the X-ray irradiation axis of the X-ray tube 13 is inclined with respect to the direction along the y-axis within the yz-plane according to this turning. Therefore, under the control of the X-ray imaging control function 211, the X-ray tube 13 provided at the other end of the support arm moves parallel to the top plate 18 while the support arm stands upright. Outside the movement range, the X-ray tube 13 can be pivoted relative to the top plate 18 while changing the oblique angle of the X-ray tube 13 with respect to the X-ray detector 14 .

In the case where the imaging apparatus 11 has a support arm and the top plate 18 is fixed, if the support arm stands upright and translates along the rail, the movement range (the X-ray tube 13 moves upright with the support arm upright) The movement range in which the support arm moves in parallel relative to the top plate 18 corresponds to the range in which the support arm stands upright and moves along the rail. In this case, the range of movement, that is, the range in which the support arm stands upright and moves along the rail, may be fixed to a predetermined range of the rail provided on the bed main body 19 at the time of shipment from the factory, or may be determined by the X-ray imaging control function. 211 may be set within the length of the rail for each shot.

If the top plate 18 is movable along with the bed main body 19 in the z-axis direction, or if the top plate 18 is movable relative to the bed main body 19 in the z-axis direction, one end of the support arm is attached to the bed main body 19 . and may be rotatable around the one end. In this case, by moving the top plate 18, the position of the X-ray tube 13 can be relatively moved in parallel with respect to the subject P. By rotating the support arm about one end, the X-ray tube 13 can be pivoted about the one end. In this case, by tilting the bed main body 19 together with the top plate 18 and the X-ray detector 14 at the end of the movement range, the top is moved while changing the oblique angle of the X-ray tube 13 with respect to the X-ray detector 14 . The X-ray tube 13 may be rotated relative to the plate 18, or the X-ray tube relative to the X-ray detector 14 may be moved by combining the tilting of the bed main body 19 and the rotation of the support arm about one end of the support arm. The X-ray tube 13 may be rotated relative to the top plate 18 while changing the oblique angle of the X-ray tube 13 .

Further, by combining the parallel movement of the support arm along the rails provided on the bed main body 19 and the movement of the top board 18, the movement range (with the support arm standing upright, the X-ray tube 13 can move to the top board 18). ) may be set.

Of course, if the top plate 18 is movable along with the bed main body 19 in the z-axis direction, or if the top plate 18 is movable relative to the bed main body 19 in the z-axis direction, the image pickup apparatus 11 may move the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanisms 17a and 17b are similarly set by combining parallel movement of the X-ray tube 13 by the X-ray tube moving mechanism 16 and movement of the top plate 18. good too.

The console device 12 is configured based on a computer and can communicate with external devices via a network. Although the following description assumes that the console device 12 executes all functions with a single console, a plurality of console devices 12 may execute these functions. The console device 12 comprises an interface 20 , a processing circuit 21 , a memory circuit 22 , an image generation circuit 23 and a display 24 .

The interface 20 receives various input operations from the user, converts the received input operations into electrical signals, and outputs the electrical signals to the processing circuit 21 . For example, the interface 20 receives settings related to long tomosynthesis imaging, such as settings for the length of the subject, ON/OFF of X-ray irradiation, X-ray dose, and the like. For example, the interface 20 is implemented by a mouse, keyboard, trackball, switch, button, joystick, or the like.

The processing circuit 21 is interconnected to each hardware component constituting the console device 12 via a bus as a common signal transmission line. The processing circuit 21 is a processor that controls the overall operation of the X-ray diagnostic apparatus 10 by reading and executing programs stored in the storage circuit 22 . The processing circuit 21 may be configured by dedicated hardware, or may be configured to realize various functions by software processing by a built-in processor. Here, as an example, a case where the processing circuit 21 realizes various functions by software processing by a processor will be described.

The processing circuit 21 has an X-ray imaging control function 211 and a reconstruction function 212 .

The X-ray imaging control function 211 controls the X-ray tube 13, the X-ray detector 14, the bed device 15, the X-ray tube moving mechanism 16, and the X-ray tube according to the imaging conditions related to X-ray irradiation set by the interface 20. It controls the tilt mechanism 17 .

The X-ray imaging control function 211 also controls the X-ray tube tilting mechanism 17 based on the length of the subject. The X-ray imaging control function 211 also sets the position where the X-ray tube 13 emits X-rays based on the length of the subject.

Specifically, the X-ray imaging control function 211 controls the linear movement range in which the X-ray tube moving mechanism 16 moves the X-ray tube 13 and the X-ray tube tilting mechanism 17 to move the X-ray tube based on the length of the subject. A tilting movement range in which the X-ray tube 13 is moved while changing the tilting angle of the tube 13 is obtained. For example, the X-ray imaging control function 211 determines whether the acquisition range of the long tomosynthesis image exceeds the moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16, and depending on the result of this determination, X-ray imaging. Determine whether or not to use the pipe tilting mechanism 17a, 17b. Depending on the length of the subject, the X-ray imaging control function 211 determines that at least one of the X-ray tube tilt mechanisms 17a and 17b may not be used. Then, the X-ray imaging control function 211 performs tomosynthesis imaging by controlling the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanism 17 based on the obtained imaging range consisting of the linear movement range and the tilting movement range.

Depending on the length of the subject placed on the top plate 18, it may be possible to acquire the necessary number of projection data for tomosynthesis image reconstruction without using at least one of the X-ray tube tilting mechanisms 17a and 17b. be. In this case, depending on the length of the subject, at least one of the X-ray tube tilting mechanisms 17a and 17b may not be used. may be used.

If the imaging apparatus 11 is provided with a support arm instead of the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanisms 17a and 17b, the movement range (the support arm stands upright relative to the top plate 18 is The range of parallel movement of the X-ray tube 13 with respect to the top plate 18 by parallel movement) can be set within the length of the rail for each imaging by the X-ray imaging control function 211 .

When the movement range is set for each imaging, the X-ray imaging control function 211 sets the movement range for parallel movement of the X-ray tube 13 with respect to the tabletop 18, for example, according to the length of the subject, and the X-ray tube 13 is set. The set movement range (the range in which the X-ray tube 13 is translated) is flexibly determined within the maximum range in which the X-ray tube 13 can be translated. For example, when a support arm is used, the X-ray imaging control function 211 controls the length of the subject P to be within the maximum range in which the X-ray tube 13 can be translated relative to the bed body 19. , the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanism 17 may be combined to perform long tomosynthesis imaging.

Moreover, regardless of whether or not the support arm is provided, the user may set whether or not to use the X-ray tube tilting mechanism 17 . In this case, the user combines the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanism 17 only when the length of the subject P exceeds the maximum moving range of the X-ray tube 13 by the X-ray tube moving mechanism 16. or even if the length of the subject P does not exceed the maximum movement range of the X-ray tube 13 by the X-ray tube moving mechanism 16, the X-ray tube moving mechanism 16 and the X-ray tube tilting mechanism 17 You can set whether to shoot in combination.

For example, if the bed main body 19 is provided with a rail for supporting one end of the support arm, the maximum range in which the X-ray tube 13 can move in parallel is within the range of the rail. One end of the support arm is rotatably supported at a predetermined position of the bed main body 19 so as not to move, and the X-ray tube 13 is adjusted relative to the subject P by moving the top plate 18 with respect to the bed main body 19 . In the case of parallel movement, it is the maximum movable range of the top plate 18 .

At this time, the X-ray imaging control function 211 does not need to set the range of turning movement to either end of the movement range, and to perform imaging while changing the oblique angle of the X-ray tube 13. Alternatively, by setting a turning range at least at one of both ends of the movement range, imaging may be performed while changing the oblique entry angle of the X-ray tube 13 in addition to imaging within the movement range.

As shown in FIG. 2, the X-ray imaging control function 211 causes the X-ray tube 13 to emit X-rays at a plurality of positions in the linear movement range and the tilt movement range of the X-ray tube 13, and emits X-rays from each of the plurality of positions. The X-ray detector 14 detects the X-rays.

A reconstruction function 212 generates a long tomosynthesis image from projection images based on x-rays detected by the x-ray detector 14 .

The storage circuit 22 has a configuration including a processor-readable recording medium such as a RAM (Random Access Memory), a semiconductor memory device such as a flash memory, a hard disk, an optical disc, or the like. The storage circuit 22 stores, for example, projection data in tomosynthesis imaging, long tomosynthesis images, and the like. Some or all of the programs and data in the recording medium of the storage circuit 22 may be downloaded by communication via a network, or may be provided to the storage circuit 22 via a portable storage medium such as an optical disk. good too.

The image generation circuit 23 generates a projection image of an X-ray fluoroscopic image or an X-ray radiographic image based on the detection signal output from the X-ray detector 14 . A reconstruction function 212 generates a long tomosynthesis image based on the generated multiple projection images.

The display 24 displays various information. For example, the display 24 displays a captured image generated by the image generation circuit 23 and the like. The display 24 outputs a GUI (Graphical User Interface) or the like for accepting various operations from the user. For example, the display 24 is a liquid crystal display, a CRT (Cathode Ray Tube) display, an OLED (Organic Light Emitting Diode) display, or the like.

The X-ray detector 14 is moved according to the position of the X-ray tube 13 under the control of the X-ray imaging control function 211 . If the X-ray detector 14 is a long detector, it does not have to be moved. Furthermore, the movement of the X-ray tube 13 with respect to the subject may include relative movement. may be performed.

Here, a case of performing tomosynthesis imaging by irradiating X-rays while directly moving the X-ray tube 13 along the body axis direction of the subject will be described using the comparative example shown in FIG.

In this comparative example, X-rays are emitted while the X-ray tube 13 is moved along the body axis direction (z-axis direction) of the subject, and the X-ray detector 14 is moved according to the movement of the X-ray tube 13. X-rays are detected by In this case, it is not possible to irradiate X-rays from a plurality of angles near the start and end points of imaging, that is, at both ends of the subject P, and it is not possible to acquire a plurality of projection images of the same site. The image will be limited to the center of the subject P.

On the other hand, as shown in FIG. 2, the X-ray diagnostic apparatus 10 according to the embodiment uses the X-ray tube tilting mechanism 17a to move the X-ray tube 13 with respect to the detection surface of the X-ray detector 14 in the vicinity of the imaging start point. X-rays are irradiated at an angle of . X-rays are irradiated while changing the oblique incidence angle until the oblique incidence angle of the X-ray tube 13 becomes 0 degrees (the irradiation surface of the X-ray tube 13 and the detection surface of the X-ray detector 14 are parallel), The left end portion of the subject P is irradiated with X-rays from a plurality of positions. For example, the X-ray tube 13 is arranged at a position where the oblique angle is 20 degrees, and X-ray irradiation is performed by changing the position of the X-ray tube 13 in increments of 5 degrees in the direction of 0 degrees. X-rays are detected by the X-ray detector 14 .

Then, the X-ray tube 13 is driven by the X-ray tube moving mechanism 16 from the position where the oblique entry angle of the X-ray tube 13 is 0 degree, that is, the starting end of the X-ray tube moving mechanism 16, to the end of the moving range in a straight line. to move. The X-ray tube 13 irradiates X-rays at a plurality of positions while moving or stopping for each X-ray irradiation, and the X-rays at each position are detected by the X-ray detector 14 .

After reaching the end of the X-ray tube moving mechanism 16, the X-ray tube tilting mechanism 17b tilts the X-ray tube 13 with respect to the detection surface of the X-ray detector 14 to irradiate X-rays. X-rays are irradiated while changing the oblique entry angle until the oblique entry angle of the X-ray tube 13 reaches a predetermined angle, and the right end portion of the subject P is irradiated with X-rays from a plurality of irradiation angles. For example, after reaching the end of the X-ray tube moving mechanism 16, X-ray irradiation is performed in increments of 5 degrees until the irradiation angle reaches 20 degrees, and the X-ray detector 14 detects X-rays at each irradiation angle.

In this way, both ends of the subject P are also irradiated with X-rays from a plurality of positions, so that projection images can be sufficiently acquired up to the vicinity of both ends of the subject P, and tomosynthesis images can be reconstructed over a wide range. Further, since a long tomosynthesis image can be reconstructed even near the imaging start point and end point, unnecessary radiation exposure can be reduced.

FIG. 3 is a flowchart showing the imaging flow of long tomosynthesis imaging in the X-ray diagnostic apparatus 10 according to the embodiment.

The X-ray imaging control function 211 sets the X-ray tube 13 at the imaging start position in the X-ray tube tilting mechanism 17a and starts X-ray irradiation (S10). The X-ray imaging control function 211 performs X-ray irradiation while changing the irradiation angle of the X-ray tube 13 with respect to the detection surface of the X-ray detector 14, and the X-ray detector 14 detects the X-rays (S11).

After the irradiation angle of the X-ray tube 13 reaches the position of 0 degrees, the X-ray imaging control function 211 linearly moves the X-ray tube 13 via the X-ray tube moving mechanism 16 to perform X-ray irradiation. (S12). X-ray detector 14 moves in accordance with X-ray tube 13 .

After the X-ray tube 13 reaches the end of the X-ray tube moving mechanism 16, the X-ray imaging control function 211 tilts the X-ray tube 13 via the X-ray tube tilting mechanism 17b to perform X-ray irradiation. , the X-ray detector 14 detects X-rays (S13). The X-ray imaging control function 211 ends the X-ray irradiation after the X-ray tube 13 reaches a predetermined X-ray irradiation angle (S14).

According to at least one embodiment described above, it is possible to acquire a wide-range tomosynthesis image while reducing unnecessary exposure.

Note that the X-ray imaging control function of the processing circuit in the embodiment is an example of the control means in the scope of claims.

Further, in the above embodiment, the term "processor" is, for example, a dedicated or general-purpose CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an application specific integrated circuit (ASIC), Circuits such as programmable logic devices (eg, Simple Programmable Logic Devices (SPLDs), Complex Programmable Logic Devices (CPLDs), and FPGAs) shall be meant. The processor implements various functions by reading and executing programs stored in the storage medium.

Further, in the above embodiments, an example of a case where a single processor of the processing circuit realizes each function is shown, but a processing circuit is configured by combining a plurality of independent processors, and each processor realizes each function. good too. Further, when a plurality of processors are provided, a storage medium for storing programs may be provided individually for each processor, or a single storage medium may collectively store programs corresponding to the functions of all processors. good too.

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

10 X-ray diagnostic device 11 Imaging device 12 Console device 13 X-ray tube 14 X-ray detector 16 X-ray tube moving mechanism 17 (17a, 17b) X-ray tube tilting mechanism 21 Processing circuit 211 X-ray imaging control function 212 Reconstruction function

Claims (7)

an X-ray tube that emits X-rays;
an X-ray detector that detects X-rays emitted by the X-ray tube;
an X-ray tube moving mechanism for moving the X-ray tube relative to the subject placed on the top plate;
while changing the oblique angle of the X-ray tube with respect to the X-ray detector in at least one of the range before and after the range in which the X-ray tube moves in parallel relative to the subject; an X-ray tube tilting mechanism that tilts and moves the X-ray tube relative to the subject;
a control means for controlling the X-ray tube moving mechanism and the X-ray tube tilting mechanism ;
the control means controls the X-ray tube tilt mechanism based on the length of the subject ;
X-ray diagnostic equipment. The range in which the X-ray tube is translated by the X-ray tube moving mechanism is
a maximum range in which the X-ray tube moving mechanism can mechanically move the X-ray tube in parallel with respect to the top plate on which the subject is placed;
The X-ray tube tilting mechanism is
X-rays while changing the oblique angle of the X-ray tube with respect to the X-ray detector in at least one of the range before and after the maximum range in which the X-ray tube can be mechanically translated. move the tube
An X-ray diagnostic apparatus according to claim 1. The control means directs X-rays to the X-ray tube at a plurality of positions within a range in which the X-ray tube is moved by the X-ray tube moving mechanism and a range in which the X-ray tube is moved by the X-ray tube tilting mechanism. to irradiate
The X-ray diagnostic apparatus according to claim 1 or 2 . further comprising reconstruction means for generating a long tomosynthesis image from the x-ray based images detected by the x-ray detector;
The X-ray diagnostic apparatus according to claim 3 . The X-ray tube moving mechanism moves the X-ray tube parallel to the body axis direction of the subject.
5. The X-ray diagnostic apparatus according to claim 1. The X-ray tube moving mechanism translates the X-ray tube with respect to the horizontal axis direction of the subject.
5. The X-ray diagnostic apparatus according to claim 1. to the computer,
A function of controlling an X-ray tube moving mechanism for moving an X-ray tube relatively in parallel with respect to a table on which a subject is placed, and a function of moving the X-ray tube relative to the subject by the X-ray tube moving mechanism. While changing the oblique angle of the X-ray tube with respect to an X-ray detector that detects X-rays emitted by the X-ray tube in at least one of the range before and after the range of relative translation. A function of controlling an X-ray tube tilting mechanism that tilts and moves the X-ray tube relative to the subject, the function of controlling the X-ray tube tilting mechanism based on the length of the subject. ,
program to make it happen.

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