JPH07213632A - Radiographic treatment device - Google Patents

Abstract

PURPOSE:To improve the efficiency of positioning by turning a testee body placing board electrically and manually by the selecting operation of a switching means. CONSTITUTION:The testee body placing board is constituted of a top board 9 on which a testee body 8 is laid, and a top board fixing carriage on which the top board 9 is fixed. The top board fixing carriage is connected to a rotary panel 25 arranged at the recessed part of a floor. The axial direction of the testee body 8 is directed to a center direction. Also, the board is comprised centering about the rotary panel 25 so as to be moved rotatably setting a virtual circle as a locus. A rotary driving source consisting of a motor and a rotation transmission switching mechanism to transmit the rotation of the motor to the top board fixing carriage are provided at the rotary panel 25. The manual and remote operations of the top board fixing carriage can be switched by switching the rotation transmittion switching mechanism, which enables the device to be operated manually and electrically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiotherapy apparatus, for example, a stereotactic radiotherapy apparatus.

[0002]

2. Description of the Related Art For example, a stereotactic radiotherapy apparatus is an apparatus for stereotactically concentrating a narrow beam of radiation on a diseased part of a subject.

Such an apparatus comprises a gantry that emits focused radiation, and a subject mounting table that mounts a subject that receives the radiation from the gantry.

Then, the object mounting table is
It can be moved in the left-right direction and the up-down direction, respectively, and can be rotated around the axis of the emitted radiation.

In this case, the movements other than the vertical movement are manually performed, and when the positioning is performed at a predetermined position, a plurality of brakes are used for locking. It was

The radiation therapy apparatus constructed in this way is
By irradiating the radiation from a wide range while moving the radiation irradiating port in the gantry and the subject mounting table in a complex manner, the radiation is intensively applied only to the affected part of the subject.

[0007]

However, in the radiotherapy apparatus configured as described above, since the rotating operation of the subject mounting table is manually operated, every time the operator in the operation room changes the irradiation direction. In addition to the complexity of having to go to the treatment room, there remains a problem that the patient takes a long time to be placed on the placing table and causes pain.

To solve such a problem, it is conceivable to solve the problem by electrifying the rotary motion. In this case, the effect of localization method irradiation is large, but the irradiation that has been conventionally performed. With respect to the law, the problem remains that alignment takes time.

Therefore, the present invention has been made under such circumstances, and the object of the present invention is not only effective in the stereotactic irradiation method, but also efficient in other irradiation methods. It is an object of the present invention to provide a radiotherapy device that can be aligned.

Another object of the present invention is to provide a radiotherapy apparatus which achieves the above object by avoiding the increase in size of the apparatus itself.

[0011]

In order to achieve such an object, the present invention comprises each means described below.

Means 1 A gantry for irradiating radiation and an object placing table for placing an object receiving the radiation from the gantry, the object placing table having the axis of the irradiated radiation as a central axis. In a radiotherapy apparatus configured to rotate about a virtual circle as a locus, an electric mechanism for electrically rotating the subject mounting table, a switching means for turning on and off the operation of the electric mechanism, and It is characterized in that it is provided with a mechanism capable of manually rotating the subject mounting table when the electric power is released by the switching means.

Means 2 In the means 1, a hydraulic brake is used to transmit rotation of a drive source for rotating the subject mounting table to the subject mounting table, and the hydraulic brake is used to release the electric power by the switching means. Is performed by canceling the.

[0014]

According to the radiotherapy apparatus having the structure of the means 1, the rotation of the subject mounting table can be performed electrically and manually by switching by the switching means.

Therefore, in the case of performing localization method irradiation,
Positioning can be achieved in a short time by switching to electric mode and rotating the subject table, and when performing other irradiation, switch to manual and rotate the subject table for accurate positioning. You will be able to achieve the combination.

According to the radiotherapy apparatus having the structure of the means 2, although the large torque can be obtained, since the rotation transmitting means composed of the compact hydraulic brake is used, it is possible to avoid the size increase of the apparatus. become able to.

[0017]

FIG. 2 is a schematic block diagram showing an embodiment of the radiation treatment apparatus according to the present invention.

In FIG. 1, there is a gantry 2 supported by a support base 1. The gantry 2 is rotatable with respect to the support base 1 in a direction indicated by an arrow 20 in the figure about the horizontal axis thereof.

The gantry 2 has a built-in electron beam generation source (not shown), and the electron beam from this electron beam generation source irradiates the X-ray target 7 through the deflection magnet 5 and the vacuum window 6, and this X-ray target 7 to X
It is designed to generate lines.

X-rays from the X-ray target 7 are conical collimator 11, filter 14, movable collimators 12, 13.
The irradiation is performed from the irradiation head 10 to the outside via the. Here, the filter 14 is provided to make the X-ray dose distribution uniform.

On the other hand, below the irradiation head 10 of the gantry 2, a subject mounting table on which a patient is mounted is arranged.

The subject mounting table includes a top plate 9 on which the subject 8 lies down, and a top plate fixed carriage 49 on which the top plate 9 is fixed.
It consists of and.

The top plate fixed carriage 49 is connected to a turntable 25 which is arranged and mounted in a concave portion formed on the floor surface. As described later in detail, the top plate fixed carriage 49 is rotated by this rotation plate 25 as required. It can be rotated and moved by the board 25.

That is, the top plate fixed carriage 49 is the rotary table 2
5 is eccentrically positioned from the center (rotational axis) of 5, and its longitudinal direction (axial direction of the subject 8) is rotationally moved about a virtual circle centered on the turntable 25 while being directed toward the center. It is supposed to do.

From this fact, since the top plate fixing carriage 49 can be rotated around the irradiation head 10 of the gantry 4, the top plate 9 fixed thereto is overhung on the irradiation head 10 side. Placed in the
The subject 8 is laid down on the overhung top plate 9. As a result, the irradiation head 10 of the gantry 2 can be made to face the affected area of the subject 8.

The top plate fixing carriage 49 has a drive mechanism for moving the top plate 9 in the direction of arrow 22 (up and down direction) in the figure, and a drive mechanism for moving it in the direction of arrow 21 (horizontal direction) in the figure. A mechanism and a moving mechanism for moving in each of the above directions in directions orthogonal to each other (front and back directions of the paper) are provided.

Thus, by irradiating the radiation from the irradiation head 10 while moving the gantry 4 and the top plate 9 in a complex manner, it is possible to intensively irradiate only the affected part of the subject 8 with the radiation. .

Next, the turntable 25 will be described.
The turntable 25 is a rotary drive source such as a motor, and the rotation from the rotary drive source is fixed to the top plate fixed carriage 4 if necessary.
9 is provided with a rotation transmission switching mechanism for transmitting the rotation transmission switching mechanism 9. The rotation of the rotation transmission switching mechanism allows the top plate fixed carriage 49 to be operated manually or remotely.

Therefore, the rotary disk 25 will be described below by dividing it into a manually operated rotating part mechanism and a remotely operated rotating part mechanism.

Rotating Mechanism Manually Operated There is a base 31 fixed to the bottom of a recess formed on the floor surface. A base 32 and a base 35 are laminated and supported on this base 31. Each of the bases 32 and 35 has an annular shape, and a motor 34, which will be described in detail later, is disposed in a recessed portion in the center formed by this.

On the outer circumference of the base 35, a cross roller bearing 36 is arranged so as to surround the base 35. The cross roller bearing 36 is configured such that a member on the inner peripheral side thereof can rotate with respect to a member on the outer peripheral side via the bearing.

A member on the inner peripheral side of the cross roller bearing 36 is fixed to the base 35 via a pressing plate 37,
The members on the outer peripheral side are fixed to the housing 38 via a pressing plate 39.

The housing 38 has the pressing plate 39.
The turntable 33 is fixed via. The turntable 33 is composed of an annular member arranged substantially flush with the floor surface, and the central axis thereof is the bases 32 and 3 described above.
5 is aligned with the central axis. As a result, the turntable 33 can freely rotate parallel to the floor surface, and a part of the turntable 33 is connected to the top plate fixing carriage 49.

As a result, when the top board fixed carriage 49 is to be manually rotated, the rotation can be freely performed.
This is because the turntable 33 connected to the top plate fixed carriage 49 can freely rotate together with the outer peripheral member of the cross roller bearing 36.

A motor 34 is fixed via a motor base 40 to a base 35 fixed to a rotary mechanism base 31 by remote control . And
The rotation axis of the motor 34 is aligned with the central axis of the base 35.

The rotation of the motor 34 can be transmitted to the output shaft 42b of the reduction gear mechanism 42. The speed reducer mechanism 42 is arranged so as to fit the rotation shaft of the motor 34, and the direction of the output shaft 42b thereof is aligned with the direction of the rotation shaft of the motor 34.

Here, as the speed reducer mechanism 42, for example, a cyclo speed reducer is used. The reason is that the planetary gear mechanism and the constant-speed internal gear mechanism are configured, and it is compact and has a large reduction ratio.

A rotary plate 44 is fixed to the output shaft 42b of the speed reducer mechanism 42, and the rotary plate 44 can be rotated about the output shaft 42b by driving the speed reducer mechanism 42.

Further, around the rotary plate 44,
As shown in detail in FIG. 1, the brake disc 4 provided with the rotary plate 44 and its center aligned with each other.
4a is formed.

On the other hand, a hydraulic brake 46 is fixed to a part of the turntable 33, and a part of the brake disc 44a is sandwiched between the brake parts. That is, when the hydraulic brake 46 is actuated, a brake (not shown) arranged therein presses the brake disc 44a, and the frictional force of the brake disc transmits the rotation of the rotary plate 44 to the turntable 33. There is.

From this, the drive of the motor 34 is driven by the turntable 3 by the brake operation of the hydraulic brake 46.
It becomes possible to rotate the top plate fixed carriage 49 via the unit 3.

Next, the effect of using a hydraulic brake as a rotation transmission switching means capable of remote operation and manual operation in the rotating mechanism will be described.

This is because, for example, when a clutch is used, a large-sized clutch is required and the turntable 25 itself becomes large. The reason is that the speed reducer mechanism 4
This is because the output torque of the speed reducer remains large even if the output torque of the motor 34 is reduced via 2.

If electromagnetic brakes are used, the number of them must be increased, which is the same as described above. The reason is, for example, as shown in FIG.
When an output of gf · m is required, with an electromagnetic brake, even if the outer diameter of the rotating plate is 1000 mm, one unit is 10 kgf.
・ Only about m torque can be obtained, and about 10 electromagnetic brakes are required. On the other hand, in the hydraulic brake, an output torque of 100 kgf · m can be obtained with an outer diameter of the rotating plate of about 400 mm.

According to the radiotherapy apparatus configured as described above, the rotation of the subject mounting table can be performed electrically and manually by switching by the switching means.

Therefore, in the case of performing localization method irradiation,
Positioning can be achieved in a short time by switching to electric mode and rotating the subject table, and when performing other irradiation, switch to manual and rotate the subject table for accurate positioning. You will be able to achieve the combination.

Further, although the large torque can be obtained, since the rotation transmission means composed of a compact hydraulic brake is used, it is possible to avoid an increase in the size of the device.

In the above-mentioned embodiment, the hydraulic brake is used as the rotation transmission switching means in the rotary disk 25, but it is not limited to this hydraulic brake, and a clutch or an electromagnetic brake may be used. There is no end.

[0049]

As is apparent from the above description,
The radiotherapy apparatus according to the present invention enables efficient positioning not only in the stereotactic irradiation method but also in other irradiation methods.

Further, it becomes possible to achieve the above object while avoiding the increase in size of the apparatus itself.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a radiotherapy apparatus according to the present invention.

FIG. 2 is an overall configuration diagram showing an embodiment of a radiotherapy apparatus according to the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of a turntable used in the radiotherapy apparatus according to the present invention.

FIG. 4 is an explanatory diagram showing an effect of the radiotherapy apparatus according to the present invention.

[Explanation of symbols]

 25 turntable 34 motor 42 speed reducer mechanism 44 rotating plate 44a brake disc 46 hydraulic brake

Claims (2)

[Claims] 1. A gantry for irradiating with radiation, and a subject mounting base for mounting a subject for receiving radiation from this gantry, wherein the subject mounting base has an axis of the irradiated radiation as a central axis. In a radiotherapy apparatus configured to rotate with a virtual circle as a locus, an electric mechanism that electrically rotates the subject mounting table, a switching unit that turns on and off the operation of the electric mechanism, and A radiotherapy apparatus comprising: a mechanism capable of manually rotating the subject mounting table when the electric power is released by the switching means. 2. A hydraulic brake is used as means for transmitting rotation of a drive source for rotating the subject mounting base to the subject mounting base, and electric power is released by the switching unit by releasing the hydraulic brake. The radiotherapy device according to claim 1, wherein