JPH07148150A - Radiation computed tomography apparatus - Google Patents

Abstract

PURPOSE:To make a position setting of a patient easy in a manner such that means for setting a tomography surface of a subject by moving a movable section such as a top board or the like has means for detecting an external force applied to the movable section and means for driving the movable section in the same direction as the external force. CONSTITUTION:Each of grips 12a and 12b of a gantry 10 has a pressure sensor. When the grips are pushed or pulled, the pressure and the direction are detected by a pressure detecting section. The detected data is inputted to a gantry/bed drive controlling section in the gantry 10 and is supplied to a gantry driving section. A rotary power of a drive motor 13 is transmitted to a truck 14d through a belt 15. A pressure sensor 22a is attached on the upper side of a bed 20 and an output of the sensor 22a is inputted to the bed/gantry drive controlling section and is supplied to a drive motor 23 through a bed driving section placed at the lower side of the bed 20. A base 26 is formed at the end of a top board 21 and the pressure sensor is constructed between them. The base 26 is driven through a chain 30 by a drive motor 29 installed on the bed 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation computed tomography apparatus (hereinafter referred to as "radiation CT apparatus"), and in particular, a doctor can observe a real-time tomographic image displayed on a monitor in an operating room. The present invention relates to a radiation CT apparatus capable of performing an operation (hereinafter, referred to as “intraoperative CT”).

[0002]

2. Description of the Related Art An X-ray CT apparatus, which is one of the conventional radiation CT apparatuses, is fixedly arranged in a diagnostic room and is used as a treatment planning apparatus for seeing through and photographing a tomographic image of a subject. Generally, an X-ray CT apparatus includes a gantry accommodating an X-ray imaging apparatus and the like, a bed on which a subject is placed at a position opposite to an opening of the gantry, and a bed slidably on the bed. It is composed of a top plate that is placed and introduces the subject into the gantry, and a control device that controls the gantry, the bed, and the top plate. A tilt mechanism and a slew mechanism are provided on the gantry, and the angle of the tomographic plane of the subject can be changed as necessary.

Further, since the reconstruction time of a tomographic image has recently been shortened, the tomographic image can be displayed in almost real time. As a result, doctors have become able to perform intraoperative CT. With intraoperative CT, it is possible to easily determine whether or not the catheter inserted into the patient's body has reached the target position accurately. In such intraoperative CT, the position of the patient is set as follows.

The gantry 1 of the X-ray CT apparatus is placed on an electric lifter 2 as shown in FIG. 11, and an operation section 3 is operated to perform movement, tilting operation, slewing operation and the like. The electric lifter 2 is used to allow the gantry to be taken in and out of the operating room. During surgery, the doctor adjusts the position of the gantry or tilts and slews the gantry while looking at the monitor provided in the operating room.

Further, in the case of the X-ray CT apparatus as shown in FIG. 12, the doctor, when setting the position of the X-ray path, does not interfere with the patient placed on the pedestal 4 and the bed 5, and sleeps on the bed. Standing on the side A of 5, ie, in front of the gantry 4, the gantry 4 and the bed 5 are moved. At this time, the gantry 4 is tilted and the top plate of the bed 5 is put in and taken out while watching which part of the patient has the X-ray path. When performing a surgery on the patient's head, the patient stands on the rear side B of the gantry 4. In this case, after confirming the tomographic image of the site to be operated on the monitor, the top plate is pulled out by a predetermined amount to perform the operation, or the operation is performed with the site to be operated stopped on the X-ray path. Was doing.

[0006]

The above-mentioned conventional X-ray C
The T device had the following problems. That is, the operation for tilting or slewing the gantry by the electric lifter 2 is performed by the operation unit 3 when auxiliary power such as an electric motor is used. For this reason, the place where the operation can be performed is limited, and it is difficult to set the position quickly and precisely. Further, in the case of manually moving the gantry 1 and the top plate, there is a problem in that the weight of each device requires a large amount of operating force, which increases the burden on the operator. Therefore, it is difficult to reliably and safely send the patient. Furthermore, when performing a surgery on the patient's head or the like, it is impossible for the physician to directly operate the operating portion 3 of the electric lifter 2 alone during the surgery because the physician is located on the rear surface of the gantry.

On the other hand, in the X-ray CT apparatus shown in FIG. 12, since the X-ray path in the gantry 4 is generally located near the bed 5, the doctor must be in the gantry when operating the head of the patient. There is a problem in that it is difficult to perform surgery because the body is put in the opening of No. 4. Further, in order to solve such a problem, when the tomographic image of the site to be operated is displayed on the monitor, if the top plate is pulled out so that the target site is located at a position where surgery is easily performed, It may not be possible to identify accurately, or you may lose time because you have to alternately check the monitor and pull out the top plate.

Therefore, an object of the present invention is to provide a radiation CT apparatus which enables a doctor to easily set the position of a patient and position a radiation path during intraoperative CT. It is another object of the present invention to provide a radiation CT apparatus that enables a doctor to easily perform a surgery on a site located in a radiation path during intraoperative CT.

[0009]

In order to solve the above problems and achieve the object, the present invention provides a mount for collecting projection data of a subject, and a mount placed at a position facing the opening of the mount. A bed on which the subject is placed, a top plate slidably arranged on the bed to introduce the subject into the gantry, and projection data obtained on the gantry is reconstructed to form a tomographic image of the subject. In the radiation computed tomography apparatus including means for setting a tomographic plane of the subject by moving a movable part including the gantry, the bed, or the top plate, the setting means is A means for detecting an external force applied to the movable portion and a driving means for driving the movable portion in the same direction as the external force detected by the means for detecting the external force are provided.

Further, a gantry for collecting projection data of the subject, a bed on which the subject is placed at a position facing the opening of the gantry, and a bed slidably disposed on the bed. In a radiation computed tomography apparatus equipped with a top plate for introducing a sample into a gantry, and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, a radiation path within the gantry It was decided to be provided on the opposite side of the bed.

Further, a gantry for collecting projection data of the subject, a bed for placing the subject placed at a position facing the opening of the gantry, and a bed slidably arranged on the bed. In a radiation computed tomography apparatus equipped with a top plate for introducing a specimen into a gantry and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, the gantry has a vertical axis. It is supposed to be supported by a rotating mechanism centered on.

[0012] Further, a gantry for collecting projection data of the subject, a bed on which the subject is placed at a position facing the opening of the gantry, and a bed slidably disposed on the bed. A radiation computed tomography apparatus comprising: a top plate for introducing a specimen into a gantry; and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, wherein a radiation path in the gantry Are movable along the axis of the opening.

[0013]

As a result of taking the above-mentioned means, the following effects occur. That is, since the operator detects the force applied to the movable parts such as the gantry, the bed, and the top plate and drives the movable parts in the same direction as the applied force, the operator's operation force can be reduced and malfunctions can be prevented. It will be possible. Further, since there is no restriction on the operation unit, it is possible to set patient position and radiation path quickly and accurately in intraoperative CT.

Since the position of the radiation path is closer to the rear of the gantry, that is, farther from the bed, it is possible to perform surgery on the patient's head during intraoperative CT without the need for the doctor to insert the body into the opening of the gantry. Becomes

The radiation path can be moved toward the rear of the gantry by rotating the gantry about the vertical axis. Further, by configuring the radiation path to be movable along the axis of the opening in the gantry, the radiation path can be moved to the rear of the gantry.

[0016]

1 to 5 are views showing an X-ray CT apparatus according to a first embodiment of the present invention. 1 is a side view of the gantry and the bed, FIG. 2 is a front view of the gantry, and FIG. 3 is a plan view of the gantry and the bed.

The X-ray CT apparatus of the present embodiment has a gantry 10 accommodating an X-ray imaging device and the like, and an opening 11 of the gantry 10.
Bed 20 which is placed at a position opposite to
And a top plate 21 slidably arranged on the bed 20 for introducing the subject into the gantry 10, and a control device (not shown) for controlling the gantry 10, the bed 20, and the top plate 21. There is.

The frame 10 is provided with grips 12a and 12b. The grips 12a and 12b are provided with pressure sensors, and when a doctor or an operator pushes or pulls the grips 12a and 12b, a pressure detection unit (not shown) provided in the gantry 10 is provided.
The pressure and direction are detected at
It is input to the bed drive control unit (not shown). The gantry / bed drive control unit is connected to a gantry drive unit (not shown) provided below the gantry 10. The gantry drive unit includes a drive motor 13, carriages 14a to 14d, and a belt 15, and the rotational force of the drive motor 13 is transmitted to the carriage 14d via the belt 15. Further, the drive motor 13 is input to a position detector (not shown) via the encoder 16 to detect the position. The carriages 14a to 14d move along the rails 17 arranged on the floor surface, and the drive motor 13 allows the entire pedestal 10 to rotate.

A grip 22 is provided on the upper side of the bed 20 via a pressure sensor 22a. Pressure sensor 22
The output of a is input to the bed / cradle drive control unit. The bed / cradle control unit is connected to a drive motor 23 via a bed driving unit (not shown) provided in the lower portion of the bed 20. The rotational force of the drive motor 23 is transmitted via a belt 24 to a carriage 25 provided below the bed 20.
The position of the bed 20 is detected by a position detection unit (not shown).

A base 26 is provided at the end of the top plate 21. As shown in FIG. 4, the base 26 is provided slidably with respect to the bed 20.
The end portion of the top plate 21 is fixed to 6 via a bolt 27. The pressure sensor 28 is provided between the end of the top plate 21 and the base 26. The base 26 is driven in the direction of the arrow in FIG. 4 by the drive motor 29 provided on the bed 20 via the chain 30. In addition,
A roller 31 is arranged between the top plate 21 and the bed 20, and an encoder is connected to the rotary shaft of the roller 31 and the position is detected by a position detector (not shown).

FIG. 5 is a control block diagram of patient position setting and X-ray path setting in this X-ray CT apparatus. Reference numeral 41 denotes a system control unit that controls the entire apparatus, and 42 denotes a gantry / bed drive control unit that is connected to the system control unit and that controls the gantry and the bed. In addition, 43 is a bed drive unit connected to the gantry / bed drive control unit 42, 44 is a pressure detection unit connected to the bed drive unit 43, and 45 is a bed drive unit 43.
The position detection part connected to is shown. Reference numeral 46 denotes a gantry drive unit connected to the gantry / bed drive control unit 42, 47 denotes a pressure detection unit connected to the gantry drive unit 46, and 48 denotes a position detection unit connected to the gantry drive unit 46. Reference numeral 49 indicates a top drive unit connected to the gantry / bed drive control unit 42, 50 indicates a pressure detection unit connected to the top drive unit 49, and 51 indicates a position detection unit connected to the top drive unit 49. There is. In addition,
Pressure detectors 44, 47, 50, position detectors 45, 48,
Reference numeral 51 is connected to the gantry / bed drive control unit 42.

In the X-ray CT apparatus constructed as above,
The patient position setting and X-ray path setting are performed as follows. That is, the patient is placed on the bed 20 and the bed 2
Hold the grip 22 of 0 and push in the direction of the gantry 10. This force is detected by the pressure detection unit 44 via the pressure sensor 21, and the direction and the magnitude of the force are input to the gantry / bed drive control unit 42. The gantry / bed drive control unit 42 drives the drive motor 23 via the bed drive unit 43 so that the bed moves in the same direction as the direction pushed by the operator. In addition,
When the operator releases the grip 22, the pressure sensor 21 does not detect the force, and the drive motor 23 stops. Furthermore, when moving in the opposite direction, the grip 22 may be pushed in the opposite direction.

Next, the base 26 provided at the end of the top plate 21 on which the patient is placed is pushed toward the gantry 10. This force is detected by the pressure detector 47 via the pressure sensor 28, and the direction and magnitude of the force are input to the gantry / bed drive controller 42. In the gantry / bed driving control unit 42, the top 21 is moved in the same direction as the direction pushed by the operator via the top driving unit 49.
The drive motor 29 is driven so that the motor moves. In addition, when the operator releases the hand from the base 26 at the time when the light beam of the projector showing the X-ray path almost reaches a predetermined part of the patient,
Since the pressure sensor 28 does not detect force, the drive motor 29
Will stop. Further, when moving in the opposite direction, the base 26 may be pushed in the opposite direction.

Next, the grip 12a or 12 of the gantry 10
Press b. This force is applied to the pressure detection unit 47 via the pressure sensor.
And the magnitude of the direction and the force are input to the gantry / bed drive control unit 42. The gantry / bed drive control unit 42 drives the drive motor 13 via the gantry drive unit 46 so that the gantry 10 rotates in the same direction as the direction pushed by the operator. The carriage 14d driven by the drive motor 13 rotates and moves along the rail 17. Note that if the operator releases his hand from the grip 12a or 12b when the light beam of the projector showing the X-ray path reaches the predetermined tomographic plane of the patient, the pressure sensor does not detect the force, and the drive motor 13 stops. Furthermore, when moving in the opposite direction, the grip 12a or 12b may be pushed in the opposite direction.

As described above, in the X-ray CT apparatus according to this embodiment, the grips 12a and 12b of the gantry 10 and the bed 20 are arranged.
The grip 22 and the pressure sensor provided on the base 26 of the top plate 21 detect the moving directions of the gantry 10, the bed 20, and the top plate 21 desired by the operator, and drive motors 13, 23, 29 in the detected directions. Power is assisted by. Therefore, the operator can easily set the patient position and the X-ray path with a small force. In addition, there is no possibility that a malfunction will occur due to a mistake in pressing the operation button.

FIG. 6 shows an X-ray CT according to the second embodiment of the present invention.
It is a top view of an apparatus. Further, FIG. 7 is an enlarged sectional view showing a lower stand of the gantry, and FIG. 8 is a diagram showing a position change of the X-ray path when the gantry is tilted.

The X-ray CT apparatus according to this embodiment has a pedestal 60 accommodating an X-ray imaging device and the like, and an opening 61 of the pedestal 60.
Bed 62 that is placed at a position facing each other and on which the subject is placed
And a top plate 63 slidably arranged on the bed 62 for introducing a subject into the gantry 60, and a controller (not shown) for controlling the gantry 60, the bed 62, and the top plate 63. There is. The X-ray path is normally located at the position indicated by the chain double-dashed line in the figure.

Reference numeral 70 in FIG. 6 indicates a stand for supporting the gantry 60 on the floor. Stand 70 is upper stand 7
It is a double structure composed of a combination of 1 and the lower stand 72. The lower stand 72 is fixed to the floor with anchor bolts. The upper stand 71 has a gear 73 on the center of rotation and is driven by a motor 74 provided on the lower stand 72 via a chain 75. An encoder 76 is incorporated in the motor 74 to detect the gantry position after rotation.

In the X-ray CT apparatus constructed as described above, by driving the motor 74, the entire gantry 60 can be rotated. Therefore, as shown in FIG. 8A, the X-ray path is located rearward of the center of the gantry 60 when the gantry rotates 180 degrees, and the doctor must perform an operation from the rear side of the gantry 60. You can

As described above, according to this embodiment, the intraoperative C
At T, when the doctor operates on the patient's head, the operation can be performed without putting the body in the opening of the gantry 60. If the gantry 60 is provided with a tilt mechanism, it is possible to move the direction of the X-ray path as shown in FIG. 8B. Also, by slightly shifting the rotation angle from 180 degrees, it becomes possible to scan the same cross section as in slewing.

FIG. 9 shows an X-ray CT according to the third embodiment of the present invention.
It is a principal part sectional view which shows the mount of an apparatus. Frame 8 of this embodiment
0 is a pedestal cover 81 having a cylindrical opening in the center.
A first stator 82 fixed to the bottom surface of the gantry cover 81; a motor 83 fixed to the upper portion of the first stator 82; a lead screw 84 provided on the rotating shaft of the motor 83; A second stator 85 screwed into the screw portion of the screw 84, and a rotor 87 supported by a bearing 86 on the second stator 85 and having a bulb / detector mounted thereon are provided. The lower end of the second stator 85 is slidably connected to the first stator 82 via the linear slider 88 in the axial direction of the opening.

X-ray C provided with a frame constructed in this way
In the T-apparatus, the second stator 85 and the rotor 87 move in the front-back direction of the gantry as the motor 83 rotates.
Along with this, the X-ray path also moves. For this reason, the X-ray path is normally located at the position indicated by X ₀ in FIG. 10, but when the doctor operates the patient's head during intraoperative CT, X _{1 in the} figure is used.
To move the X-ray path to the position indicated by ~ X ₄ ,
The doctor can perform an operation from the rear side of the gantry 80.

As described above, according to this embodiment, a doctor can perform an operation without putting his body in the opening of the gantry.
Further, since the X-ray path can be continuously moved, precise X-ray path setting can be performed, and a scanogram can be created by moving the X-ray path while irradiating X-rays. It is possible. Furthermore, if the patient has a catheter or drip tube,
Since the position of the X-ray path can be changed without moving the top plate, the safety of the patient can be ensured without the device falling off. Further, when the gantry is moved, a rough operation can be performed by the gantry body itself, and a minute operation can be performed by controlling the X-ray path for precise positioning. Further, even if the patient moves during the operation, the desired slice plane can be quickly found again by performing delicate control by this method.

Although the X-ray path moves in the slice direction in the present embodiment, a mechanism such as a tilt mechanism or a slew mechanism may be added. The present invention is not limited to the above-mentioned embodiments. That is, although the intraoperative CT has been described in the above embodiment, it may be used for inspection of a normal tomographic image. In particular, in the third embodiment, by continuously moving the X-ray path in the gantry, it is possible to obtain a large number of tomographic images of the subject without moving the top plate. Of course, various modifications can be made without departing from the scope of the present invention.

[0035]

According to the present invention, the following is possible. That is, since the operator detects the force applied to the gantry, the bed, and the top board and drives the gantry and the like in the same direction as the applied force, it is possible to reduce the operating force of the operator and prevent malfunction. Further, since there is no restriction on the operation unit, it is possible to quickly and precisely set the subject position and the radiation path in the intraoperative CT.

Since the position of the radiation path is closer to the rear of the gantry, that is, the position away from the bed, the doctor can perform surgery on the head of the subject during intraoperative CT without inserting the body into the opening of the gantry. It will be possible.

[Brief description of drawings]

FIG. 1 is a side view showing an X-ray CT apparatus according to a first embodiment of the present invention.

FIG. 2 is a front view showing the gantry of the same device from the rear.

FIG. 3 is a plan view showing the device.

FIG. 4 is an enlarged cross-sectional view showing a base incorporated in a bed of the device.

FIG. 5 is a block diagram showing a gantry / bed drive control unit of the apparatus.

FIG. 6 is a plan view of an X-ray CT apparatus according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a rotation mechanism incorporated in a frame of the device.

FIG. 8 is a side view showing a gantry during the intraoperative CT in the same apparatus.

FIG. 9 is a sectional view showing a main part of a gantry of an X-ray CT apparatus according to a third embodiment of the present invention.

FIG. 10 is a side view of the gantry during movement of the X-ray path in the same apparatus.

FIG. 11 is a perspective view showing an electric lifter that moves a gantry of a conventional X-ray CT apparatus.

FIG. 12 is a plan view showing a conventional X-ray CT apparatus.

[Explanation of symbols]

10, 60, 80 ... Stand 11 ... Openings 12a, 12b, 22 ... Grips 13, 23, 29
... Drive motors 14a to 14d, 25 ... Bogie 16, 76 ... Encoder 17 ... Rail 20 ... Sleeper 22a, 28 ... Pressure sensor 26 ... Bogie 30, 75 ... Chain 31 ... Roller 70 ... Stand 71 ... Upper stand 72 ... Lower stand 73 ... Gears 74, 83 ... Motor 81 ... Stand cover 82 ... First stator 84 ... Lead screw 85 ... Second stator 86 ... Bearing 87 ... Rotor

Claims (4)

[Claims] 1. A gantry that collects projection data of a subject, a bed that is placed at a position facing the opening of the gantry and that places the subject, and a bed that is slidably placed on the bed. A top plate for introducing a sample into the gantry, a means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, and a movable unit including the gantry, the bed, or the top plate. In a radiation computed tomography apparatus including means for setting a tomographic plane of the subject by moving, the setting means is detected by means for detecting an external force applied to the movable part and means for detecting the external force. A radiation computed tomography apparatus comprising: drive means for driving the movable portion in the same direction as the applied external force. 2. A gantry that collects projection data of a subject, a bed that is placed at a position facing the opening of the gantry and that places the subject, and a bed that is slidably placed on the bed. In a radiation computed tomography apparatus equipped with a top plate for introducing a specimen into a gantry, and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, a radiation path is provided in the gantry. A radiation computed tomography apparatus, which is provided on the side opposite to the bed. 3. A gantry that collects projection data of a subject, a bed that is placed at a position facing the opening of the gantry and that places the subject, and a bed that is slidably placed on the bed. In a radiation computed tomography apparatus comprising a top plate for introducing a specimen into a gantry and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, the gantry has a vertical axis. A radiation computed tomography apparatus, which is supported by a rotating mechanism centering around the. 4. A gantry that collects projection data of a subject, a bed that is placed at a position facing the opening of the gantry and that places the subject, and a bed that is slidably placed on the bed. A radiation computed tomography apparatus comprising: a top plate for introducing a specimen into a gantry; and means for reconstructing projection data obtained on the gantry to obtain a tomographic image of the subject, wherein a radiation path in the gantry Is movable along the axis of the opening, a radiation computed tomography apparatus.