JP2634149B2 - Stereotactic radiotherapy device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereotactic radiotherapy apparatus, and more particularly to a stereotactic radiotherapy apparatus in which a plurality of different types of collimators are prepared, and a selected one of the collimators is mounted on a holder. About.

[0002]

2. Description of the Related Art A so-called stereotactic radiotherapy apparatus is configured so that a radiation beam can be applied to a lesion of a subject from multiple directions, thereby making it possible to irradiate the lesion without adversely affecting other peripheral organs. Radiation can be intensively applied only to the part.

[0003] It is preferable that the diameter of the irradiated radiation beam can be appropriately set, for example, in accordance with the shape of the lesion.

For this reason, a stereotactic radiotherapy apparatus can be used by mounting a collimator having a beam passage hole having a predetermined shape (for example, a diameter) on a holder provided at an irradiation port of the radiation beam. It has become.

Therefore, for example, various collimators having different diameters of the beam passage holes are prepared in advance, and one of them is selected and used as needed.

[0006]

However, in the stereotactic radiotherapy apparatus constructed as described above, the holder attached to it is composed of a cylindrical member, and the collimator attached to it is all cylindrical regardless of its type. (A thin beam passage hole is formed along the center axis of the collimator), the type of the collimator cannot be clearly determined only from the appearance of the collimator.

[0007] For this reason, after the selected collimator is recognized as correct and mounted on the holder as it is, radiation treatment is performed without considering whether or not it is of the wrong type. The negative effect was pointed out.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a stereotactic radiotherapy which can perform a treatment only when it is confirmed that a selected collimator is of a correct type. In providing the device.

[0009]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

Means 1. A plurality of collimators of different types are prepared, of which a selected collimator is mounted on a holder and used in a stereotactic radiotherapy apparatus, wherein the collimator has a step formed at a different portion depending on its type. together with the holder moving member which is moved by the pressing from the step of the collimator mounted at each site corresponding to each step of the various said collimator is provided, the movement of the moving member from the outside of the holder It is characterized by being visible.

Means 2. An input unit for inputting information on a type of the selected collimator;
Detecting means for detecting which one of the plurality of moving members provided on the holder has moved; comparing means for comparing information from the detecting means with information input to the input means; A determination means for determining whether the selected collimator is correct or not and informing the user of the determination.

[0012]

According to the construction of the above-mentioned means 1, the moving member provided on the holder is moved in accordance with the type of the collimator to be mounted, and the moved moving member can be visually checked.

For this reason, if the moved moving member is a desired one, it can be confirmed that the mounted collimator is a regular one and not of another type.

Therefore, it is possible to eliminate a problem that a collimator of another type is erroneously mounted and used as it is.

Further, according to the configuration of the means 2, it is possible to manage whether or not the mounted collimator is correct only by inputting information on the type of the collimator to be selected, for example, by a computer or the like. Therefore, it is possible to completely eliminate the adverse effect that a collimator of another type is erroneously attached and used as it is.

[0016]

FIG. 2 is a schematic diagram showing one embodiment of the radiation therapy apparatus according to the present invention.

In FIG. 1, there is a gantry 2 supported on a support table 1. The gantry 2 can rotate about the horizontal axis with respect to the support table 1 as shown by an arrow 20 in the figure.

The gantry 2 has a built-in electron beam source (not shown), and an electron beam 3 from this electron beam source is transmitted through a deflection magnet 5 and a vacuum window 6 to an X-ray source.
The X-ray target 7 irradiates the X-ray target 7 to generate X-rays.

X-rays from the X-ray target 7 are irradiated to the outside of the gantry 2 through a conical collimator 11 and movable collimators 12 and 13 to have a predetermined beam diameter by a collimator 19 attached to the irradiation head 10. It has become so.

The collimator 19 is made up of a columnar lead member which is inserted and mounted inside a cylindrical holder fixedly mounted on the irradiation head 10, as will be apparent in detail later. , A beam passing hole is provided along the central axis.

On the other hand, below the irradiation head 10 of the gantry 4, there is a table 9 on which the subject 8 lies down.
Is fixed to a top plate fixing cart 49.

The top plate fixed carriage 49 is configured to be rotatable around an imaginary circle centered on the rotary plate 25 by a rotary plate 25 mounted on the floor surface. For this reason, the top plate fixed carriage 49 can be rotated around the irradiation head 10 of the gantry 4.

The top plate 9 fixed to the top plate fixing carriage 49 is arranged in an overhanging state on the irradiation head 10 side, and the subject 8 lies on the overhung top plate 9. It has become. Thereby, the irradiation head 10 of the gantry 2 can be opposed to the lesion of the subject 8.

By irradiating the radiation from the irradiation head 10 while moving the gantry 4 and the top 9 in a complex manner, the radiation can be intensively applied only to the lesion of the subject 8. I have.

In this case, the intersection of the extension line of the rotation axis of the gantry 4 and the radiation 43 from the irradiation head 10 is called an isocenter 15, and the lesion of the subject 8 is always matched to the isocenter 15, and 4 and the top plate 9 move in a complex manner.

Next, with reference to FIG. 1, the configuration according to an embodiment of the collimator 19 is inserted is attached to the holder 29 and the holder 2 9 fixedly attached to the irradiation head 10.

In the figure, first, the collimator 19 is formed of a substantially cylindrical lead member, and a beam passage hole 43 is formed along the center axis thereof.

The collimator 19 in this drawing shows one of a plurality of types.

The collimator 1 9, as shown in the perspective view of FIG. 3, has a the x-y plane parallel to the plane in the figure as face 19A, each of the other face 19B is the central axis of the beam passage hole 43 And a curved surface composed of a coaxial circle.

A flange 50 is provided on each of the curved surfaces 19B.

The flange portion 50 is formed of a projecting member extending from the facing surface 19 and having a plane perpendicular to the central axis, and its peripheral end forms a part of a circle coaxial with the central axis. FIG. 3 is a diagram viewed from the direction A in FIG.
It corresponds to.

The collimator 19 configured as described above is connected to one opening end of the cylindrical holder 29 fixedly attached to the irradiation head 10 (not shown) (the side opposite to the side attached to the irradiation head 10). It is to be inserted.

The holder 29 has an inner diameter of the collimator 19.
Is slightly larger than the outer diameter of the flange portion 50,
A plurality of flange receiving portions 65 for supporting the flange portion are formed on the inner wall surface in multiple stages.

[0034] That is, as shown in FIG. 4 the collimator 19 is a sectional view taken along line VI-VI of the holder 29 which is inserted completely interfere with the flange portion 50 during insertion of the flange receiving portion 6 5 collimator 19 The flange portion 50 is positioned on the flange receiving portion 65 by rotating the collimator 19 by approximately 90 ° .

As a result, the flange portion 50 is supported by the flange receiving portion 65, so that the collimator 19 is prevented from dropping from the holder 29 and can be maintained in the mounted state.

Here, as shown in FIG. 1, a plurality of flange receiving portions 65 are formed on the inner wall surface of the holder 29 in multiple stages because the flange portion 5 is formed in accordance with the type of the collimator 19.
This is because the location where 0 is formed is different.

That is, as described above, a plurality of types of collimators 19 are prepared according to the types, and one of the collimators 19 selected from the collimators 19 is inserted into the holder 29 and rotated. By
The flange portion 50 is always supported by one of a plurality of flange receiving portions 65 formed in multiple stages.

Further, as shown in FIG. 4, the holder 29 is provided with a pawl member 52 at a portion of the inner wall surface where the flange receiving portion 65 is formed. The pawl member 52 is urged by, for example, a spring 58 so as to always protrude from the inner wall surface of the holder 29.

That is, by rotating the collimator 19 as shown by the arrow B in the figure, the flange portion 50 is supported by the flange receiving portion 65, and the pawl member 52 is held by the end face of the flange portion 50 by the spring 58. To push out against the urging force.

The pawl member 52 is formed in multiple stages similarly to the flange receiving portion 65, and the movement accompanying the pushing of the pawl member 52 is transmitted as it is to the display member 51 connected thereto (FIG. 4 is indicated by a dotted line).

As shown in FIG. 5, which shows the outer peripheral surface of the holder 29, a numeral corresponding to, for example, the diameter of the beam passage hole 43 of the collimator 19 is marked on the display member 51.

For this reason, among the collimators 19 prepared for a plurality of types, for example,
Is selected by inserting the selected collimator 19 into the holder 29 and rotating it so that only the display member 51 on which the display of '20' is made protrudes, and other display is performed. It can be visually recognized that the member 51 maintains the state as it is.

Thus, if the protruding display member 51 is desired, it can be confirmed that the mounted collimator 19 is of a regular type and not of another type.

Therefore, it is possible to eliminate the problem that another type of collimator 19 is mistakenly mounted and used as it is.

FIG. 6 is a circuit diagram obtained by further improving the above configuration.

In the figure, there is a sensor 55, which is, for example, a light reflection type sensor 55a to 55e.
It is composed of

These light reflection type sensors 55a to 55a
Are the display members 5 as shown in FIG. 5 (or FIG. 4).
When the corresponding display member 51 protrudes, it is detected and an output signal '1' is output, and when it is not detected, an output signal '0' is output.

These outputs are input to a comparison circuit 163 as shown in FIG.

On the other hand, this circuit is provided with input means 161. Here, when one of the collimators 19 prepared for a plurality of types is selected, for example, the case where the diameter of the beam passage hole 43 is used as a guide is considered.
In this embodiment, for example, a collimator having a diameter of "20" is selected, and information "20" corresponding to the diameter is input to the input means 161.

The information from the input means 161 is stored in the storage device 16.
2 is input. This storage device 161
As shown in FIG. 7, the input information and the corresponding '
1 "0" information is stored as a table.

Therefore, based on the above example, the information
When 20 ′ is input, the corresponding information of 00100 is read and input to the comparison circuit 163.

In the comparison circuit 163, the sensor 55
If the collimator 19 is correctly selected, the information of 00100 is input in order from the light reflection type sensor 55a.

Therefore, the coincidence of each information is determined by the comparison circuit 163.
And a signal to that effect is issued by an alarm device (judgment means) 16.
4 is input.

The alarm device 164 may be configured to issue an alarm so as to notify the user, for example, when the comparison is not made by the comparison circuit 163, or vice versa. In short, this alarm 164
It is only necessary that the person who selects the collimator 19 can determine whether or not the selection is correct by the operation of.

In FIG. 6, the storage device 162, the comparison circuit 163, and the alarm device 164 include a control device 164.
Is controlled by the

In such a configuration, the correctness of the mounted collimator 19 can be managed by, for example, a computer or the like, so that a collimator of another type is erroneously mounted and used as it is. Can be completely eliminated.

As described above, the present invention has been specifically described based on the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the scope of the present invention. is there.

[0058]

In the case where the circuit shown in FIG. 6 is provided, the display member 51 is not necessarily required, and therefore need not be attached. In this case, a sensor that can detect the movement of the pawl member 52 may be provided.

[0060]

As is apparent from the above description,
According to the stereotactic radiation therapy apparatus according to the present invention, the treatment can be performed only after it is confirmed that the selected collimator is of the correct type.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing one embodiment of a stereotactic radiotherapy apparatus according to the present invention.

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

FIG. 3 is a perspective view showing one embodiment of a collimator used in the present invention.

FIG. 4 is a cross-sectional view taken along line VI-VI of the holder on which the collimator is mounted in FIG.

FIG. 5 is a configuration diagram showing one embodiment of an outer peripheral surface of a holder used in the present invention.

FIG. 6 is a circuit diagram showing one embodiment of a circuit provided in the present invention.

FIG. 7 is an explanatory diagram showing one embodiment of table information stored in the storage device of FIG. 6;

[Explanation of symbols]

 19 Collimator 29 Holder 50 Flange 52 Pawl member 51 Display member 65 Flange receiver 161 Input means 163 Comparison circuit

Claims (2)

(57) [Claims] 1. A stereotactic radiotherapy apparatus in which a plurality of collimators of different types are prepared, and a selected collimator is mounted on a holder and used, wherein the collimator has a step at a different site depending on the type. together are formed over a substrate wherein the holder moving member in the pressing Accordingly moves from the step of the collimator mounted at each site corresponding to each step of the various said collimator is provided on, the moving member A stereotactic radiotherapy apparatus characterized in that the movement can be viewed from outside the holder. 2. An input means for inputting information on a type of a selected collimator, a detecting means for detecting which of a plurality of moving members provided on the holder has moved, and information from the detecting means. And comparing means for comparing the information inputted to said input means with said collimator, and judging means for judging whether the collimator selected by said comparing means is correct or not, and informing said fact. A stereotactic radiotherapy device as described.