TWI558435B - Neutron capture therapy, and neutron capture therapy systems - Google Patents

Description

Neutron capture therapy treatment table, and neutron capture therapy system

The present application claims priority based on Japanese Patent Application No. 2014-218565, filed on Oct. 27, 2014. The entire contents of this Japanese application are incorporated herein by reference.

The present invention relates to a treatment table for neutron capture therapy and a neutron capture therapy system.

Patent Document 1 discloses a treatment table for performing a therapeutic neutron capture treatment on a patient (irradiated body) by irradiating a neutron beam. The treatment table includes a base portion, a top plate (mounting portion) on which the patient is placed, and a collimator mounting portion to which a collimator that defines an irradiation range of the sub-beams irradiated to the patient is attached. The top plate is movable relative to the base portion, and the collimator mounting portion is fixed to the base portion. In the treatment table, the positional relationship between the top plate and the collimator can be adjusted by moving the top plate relative to the base portion.

In the neutron capture treatment system described in Patent Document 1, first, the patient lying on the top plate is restrained in the preparation chamber, and the top plate is moved relative to the base portion to align the patient's irradiation target with the collimator. . After alignment, the treatment table is moved from the preparation chamber to the illumination chamber. In the irradiation room, in the setting The irradiation port of the beamlets placed in the wall portion of the irradiation chamber is inserted into the collimator to irradiate the neutron beam. When the treatment table is moved, since the width of the passage between the door of the preparation chamber, the door of the irradiation chamber, or the irradiation chamber and the preparation chamber is narrow, in order to suppress mutual interference between the top plate and the doors when moving, the top plate is rotated relative to the base portion. On the other hand, the treatment table is moved in a state in which the longitudinal direction of the top plate is moved along the moving direction of the treatment table, and after the end of the movement, the top plate is rotated to return to the same direction as the alignment.

The reason for the alignment between the patient and the collimator in the preparation chamber without the irradiation chamber as described above is as follows. That is, in neutron capture therapy, it is preferred to accurately illuminate the neutron beam to the patient, but in practice, a certain degree of neutron beam may be irradiated to the entire irradiation chamber. Therefore, it may be that the dose in the irradiation room becomes high, and it is not suitable for the operator or the doctor to stay in the irradiation room for a long time. On the other hand, it takes some time to align the patient placed on the top plate of the treatment table with the collimator. For the above reasons, the patient and the collimator are aligned in the preparation chamber without the irradiation chamber.

The reason why the width of the door of the preparation room and the door of the irradiation room is narrow as described above is as follows. That is, the door of the preparation room and the door of the irradiation room are usually made of a shield such as lead shielding radiation, and are formed to be very thick. For example, a motor or the like is used when opening and closing the door, and since the weight of the door is large, it is necessary to open and close at a low speed from the viewpoint of safety. Therefore, the wider the door, the longer it takes to open and close. For the above reasons, the width of the door of the preparation room and the door of the irradiation room is narrow. In addition, in the case where the width of the door is large, the width of the opening formed by the opening of the door when the treatment table is passed may be narrowed, thereby reducing the amount of movement of the door.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2014-161621

In the neutron capture treatment system described in Patent Document 1, since the collimator attachment portion is fixed to the base portion as described above, if the top plate is rotated relative to the base portion when the treatment table is moved, the top plate and the collimator The positional relationship between them will change. Therefore, after the end of the movement, even if the top plate is rotated so that the direction is the same as that in the setting, and the state in the preparation room is reproduced, the top plate may not be accurately returned to the original position. At this time, there is a possibility that the positional relationship between the collimator and the patient deviates from the positional relationship at the time of setting, and the treatment cannot be planned as planned.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a treatment table for a sub-capture treatment that can maintain a positional relationship between a collimator and an object to be irradiated and move the neutron capture treatment treatment table into the irradiation room. Sub-capture treatment system.

The treatment table for neutron capture treatment of the present invention is for placing an object to be irradiated when performing neutron capture treatment for irradiating a neutron beam to an object to be irradiated, comprising: a walking portion, walking along the ground; and a top plate On the walking portion, and for placing the object to be irradiated; the collimator is disposed on the running portion and is provided for use An opening for defining an irradiation range of the neutron beam; the collimator mounting portion supports the collimator so as to adjust a position of the collimator relative to the top plate; and the first rotation support portion to be rotatable relative to the running portion The way to support the top plate and collimator.

In the present invention, when the setting is performed, the positional relationship of the collimator with respect to the top plate (irradiated body) is adjusted by the collimator mounting portion, and the top plate and the collimator are aligned. Further, when the treatment table is moved, the top plate and the collimator are rotated together with respect to the traveling portion by rotating the first rotation support portion, thereby achieving a state in which the top plate and the door of the preparation room do not interfere with each other. At this time, since the top plate and the collimator are integrally rotated, the positional relationship between the top plate and the collimator does not change. Further, after the end of the movement, by rotating the first rotation support portion to the position at the time of installation, it is possible to accurately reproduce the state at the time of installation. Therefore, according to the present invention, the positional relationship between the collimator and the irradiated body can be maintained and the treatment table can be moved to the irradiation chamber.

Further, in the neutron capture treatment treatment table of the present invention, the collimator attachment portion may have a second rotation support portion that supports the collimator so as to be rotatable relative to the top plate. According to this configuration, the position of the collimator with respect to the top plate can be adjusted by the collimator mounting portion with a simple configuration.

Further, in the neutron capture treatment treatment table of the present invention, the rotation axis of the first rotation support portion and the rotation axis of the second rotation support portion may be on the same straight line. In the neutron capture treatment system, it is possible to embed the collimator in the illumination port of the beamlets disposed in the wall portion of the irradiation chamber. At this time, when the setting is performed, the top plate and the collimator are aligned by rotating the second rotation support portion, and the alignment of the collimator with respect to the irradiation port is performed by rotating the first rotation support portion. Bit. At this time, in order to embed the collimator in the irradiation port, it is necessary to align the position and posture of the collimator with the irradiation port. When the rotation axis of the first rotation support portion is different from the rotation axis of the second rotation support portion, the movement of the first rotation support portion is different from that of the collimator when the second rotation support portion is rotated, so that it is difficult to collimate The position and posture of the device are aligned to the illumination port. In this regard, according to this configuration, the rotation axis of the first rotation support portion and the rotation axis of the second rotation support portion are on the same straight line, and regardless of which of the first rotation support portion and the second rotation support portion is rotated, The straighteners move on the same circumference, so it is easy to align the position and posture of the collimator to the illumination port.

Further, in the treatment table for neutron capture treatment of the present invention, the traveling portion may have a base portion that moves along the ground and a direction in which the first rotation support portion is moved in a direction intersecting the movement direction of the base portion with respect to the base portion. Traverse section. In the neutron capture treatment system, it is possible to set the irradiation port of the neutron beam to open in a direction crossing the moving direction of the running portion (base portion). In this regard, according to this configuration, after the collimator is placed at the predetermined position, the first rotation support portion (the top plate and the collimator) is moved in the direction by the traverse portion, so that the collimator can be embedded in Irradiation port. Therefore, the collimator can be easily and accurately inserted into the irradiation port as compared with a case where the collimator can be inserted into the irradiation port by, for example, a treatment table that can be moved in an arbitrary direction on the ground by an operator or the like.

Further, in the neutron capture and treatment system of the present invention, the neutron beam is irradiated onto the object to be irradiated, and the treatment table for neutron capture treatment according to any one of claims 1 to 4 is provided; Collimator and irradiated body a preparation room for adjusting the positional relationship; an irradiation chamber for irradiating the neutron beam toward the irradiated body; and an irradiation port for the sub-beams provided in the wall portion of the irradiation chamber, and the treatment table for the neutron capture treatment can be in the preparation room Walk with the irradiation room.

In the present invention, when the setting is performed, the positional relationship of the collimator with respect to the top plate (irradiated body) is adjusted by the collimator mounting portion, and the top plate and the collimator are aligned. Further, when the treatment table is moved, the top plate and the collimator are rotated together with respect to the traveling portion by rotating the first rotation support portion, thereby achieving a state in which the top plate and the door of the preparation room do not interfere with each other. At this time, since the top plate and the collimator are integrally rotated, the positional relationship between the top plate and the collimator does not change. Further, after the end of the movement, by rotating the first rotation support portion to the position at the time of installation, it is possible to accurately reproduce the state at the time of installation. Therefore, according to the present invention, the positional relationship between the collimator and the irradiated body can be maintained and the treatment table can be moved to the irradiation chamber.

Further, in the neutron capture treatment system of the present invention, a door for shielding radiation emitted from the inside of the irradiation chamber may be provided between the irradiation chamber and the preparation chamber, so that the neutron capture treatment treatment table passes through the door opening The width of the formed opening is smaller than the length of the top side of the top plate. According to the neutron capture treatment system, even when the neutron capture treatment treatment table is passed, the width of the opening formed by the opening of the door is smaller than the length of the longitudinal direction of the top plate, and the collimator and the keeper can be maintained. The positional relationship of the illuminating body and the treatment table are moved to the irradiation room.

According to the present invention, there is provided a sub-capture treatment treatment table and a neutron capture treatment system capable of maintaining a positional relationship between a collimator and an object to be irradiated and moving the neutron capture treatment treatment table into the irradiation room.

1‧‧‧neutron capture therapy system

2‧‧‧ treatment table (treatment table for neutron capture therapy)

3‧‧‧ preparation room

4‧‧‧Induction room

14‧‧‧ collimator

14a‧‧ ‧ opening of the collimator

16‧‧‧ illuminated mouth

30‧‧‧ Walking Department

31‧‧‧ base

33‧‧‧ traverse

41‧‧‧ top board

47‧‧‧1st rotation support mechanism (1st rotation support part)

50‧‧‧collimator installation

55‧‧‧2nd rotation support mechanism (2nd rotation support part)

A‧‧‧Rotary axis

D‧‧‧ Door

L‧‧‧ Length of the long side of the top plate

M1‧‧‧ openings formed by the door

N‧‧‧neutron beam

S‧‧‧ patients (irradiated body)

WD1‧‧‧The width of the opening formed by the door

Fig. 1 is a schematic view showing the structure and arrangement of a neutron capture treatment system according to an embodiment.

Fig. 2 is a view showing a neutron beam generating unit and its surroundings.

Figure 3 is a diagram showing the treatment table.

The fourth (a) to (c) diagrams show a schematic plan view of the movement of the treatment table.

The fifth (a) to (c) are schematic plan views showing the movement of the treatment table, and are subsequent views of Fig. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are given to the same or corresponding parts, and the repeated description is omitted. Further, an XYZ-axis coordinate system (refer to FIGS. 2 to 4) is set, and an emission direction in which the beamlet N is emitted from a neutron beam generation unit 9 to be described later is defined as an X-axis, and is orthogonal to the X-axis. The direction along the ground F is set to the Y axis, and the direction perpendicular to the floor F is set to the Z axis, and this coordinate system is appropriately used for the description of the positional relationship of each constituent element.

Fig. 1 is a perspective view showing a structure of a neutron capture treatment system according to an embodiment, and Fig. 2 is a view showing a neutron beam generation unit and its surroundings. The neutron capture treatment system 1 of the embodiment is a device for performing boron neutron capture treatment (BNCT: Boron Neutorn Capture Therapy). By boron neutron capture therapy of a patient (to be irradiated) injection of boron neutron irradiation beam ⁽¹⁰ B) to the cancer treatment therapy.

As shown in Fig. 1, the neutron capture treatment system 1 includes a treatment table 2 (a treatment table for neutron capture therapy) for binding and administering a patient, and a preparation for binding the patient to the treatment table 2, etc. The preparation chamber 3, the irradiation chamber 4 that irradiates the patient with the neutron beam, the communication chamber 5 provided between the preparation chamber 3 and the irradiation chamber 4, and the neutron beam generation chamber 6 provided adjacent to the irradiation chamber 4. The neutron beam generation sub-beam generation unit 7 (second diagram) is provided in the neutron beam generation chamber 6.

As shown in Fig. 2, the neutron beam generating unit 7 includes an accelerator 8 that accelerates the charged particles to emit the charged particle beam P, and a charged particle beam P emitted from the accelerator 8 to generate a beamlet generation among the neutron beam N. Department 9. The accelerator 8 is, for example, a cyclotron that accelerates charged particles and emits a charged particle beam P (for example, a proton beam).

The neutron beam generating unit 9 includes a charged particle beam scanning unit 11, a target T for generating the neutron beam N, a decelerating material 12 for decelerating the neutron beam N to reduce the energy of the neutron beam N, and shielding radiation. The shield 13 is provided. The charged particle beam scanning unit 11 scans the charged particle beam P to perform irradiation control for irradiating the target T with the charged particle beam P. The target T can be formed, for example, in the shape of a disk made of beryllium (Be), but other shapes or liquids can be used. The target T is irradiated with the charged particle beam P to generate a neutron beam N.

A part of the decelerating material 12 and the shield 13 is provided in the concrete shield wall W between the shield irradiation chamber 4 and the neutron beam generating chamber 6. The decelerating material 12 decelerates the sub-beam N emitted from the target T to reduce the energy of the neutron beam N. The decelerating material 12 is, for example, a laminated structure in which a plurality of different materials are laminated. The shield 13 shields secondary radiation such as gamma rays generated by the generation of the neutron beam N, the generation of the neutron beam N in the target T, and the deceleration of the neutron beam N in the decelerating material 12. The secondary radiation such as γ-rays generated is prevented from being radiated to the outside (on the side of the irradiation chamber 4).

A collimator 14 for specifying an irradiation range in which the neutron beam N illuminates the patient S is disposed in front of the decelerating material 12. In the neutron beam generating unit 9, the charged particle beam P illuminates the target T, thereby generating the neutron beam N. The generated neutron beam N is decelerated by the decelerating material 12. The neutron beam N is emitted from the decelerating material 12 and passes through the collimator 14 and then irradiated to the patient S on the treatment table 2. The neutron beam N includes a high-speed neutron beam, an epithermal neutron beam, and a thermal neutron beam, which are also accompanied by gamma rays. Among them, the thermal neutron beam is nuclearly reacted with boron taken up by the tumor in the patient S to exert an effective therapeutic effect. A part of the epithermal neutron beam contained in the beam of the neutron beam N is also decelerated in the body of the patient S to become an epithermal neutron beam that exhibits the above-described therapeutic effect.

The collimator 14 is, for example, a flat plate having a circular shape. The outer shape of the collimator 14 corresponds to the inner surface shape of the irradiation port 16 provided in the irradiation chamber 4 to be described later. For example, a circular opening 14a for defining an irradiation range is provided on the collimator 14. By keeping the posture of the patient S at a predetermined position with respect to the opening 14a, the neutron beam N passing through the opening 14a can be irradiated to the predetermined irradiation target of the patient S. In this example, the collimator 14 is configured such that The illumination center axis C passing through the center of the irradiation field (the center of the opening 14a) is placed on the X-axis.

The irradiation chamber 4 will be described with reference to Fig. 1 . The irradiation room 4 is a room for irradiating the neutron beam N to the patient S and arranging the patient S indoors. The irradiation chamber 4 has a shielding space surrounded by a concrete shielding wall. A pair of doors D1 and D1 that can open and close are provided at the entrance and exit of the irradiation chamber 4. The entrance and exit of the irradiation chamber 4 has a size that allows the treatment table 2 to pass. More specifically, the entrance and exit of the irradiation chamber 4 has a size that allows the treatment table 2 to pass through the state in which the longitudinal direction of the top plate 41 to be described later is along the Y-axis direction (the state of FIG. 4(c)). Further, in the present example, the width of the entrance and exit of the irradiation chamber 4 in the X-axis direction is smaller than the length L of the longitudinal direction of the top plate 41 (second drawing). Therefore, in a state where the longitudinal direction of the top plate 41 is along the X-axis, the treatment table 2 cannot pass through the entrance and exit of the irradiation chamber 4. In order to save space and ensure shielding of radiation, it is desirable to narrow the entrance and exit of the irradiation chamber 4 as much as possible. That is, in a state where the pair of doors D1, D1 are opened, the width of the opening M1 (the width of the pair of doors D1, D1 in the opening and closing direction) formed between the doors is smaller than the length of the longitudinal direction of the top plate 41. L. In other words, the width WD1 of the opening M1 formed by opening the pair of doors D1 and D1 when the treatment table 2 is passed is smaller than the length L of the longitudinal direction of the top plate 41. Further, the width WD1 of the opening M1 when the treatment table 2 is passed may be set to be smaller than the width of the opening M1 in the maximum state in which the pair of doors D1 and D1 are opened. Further, the pair of doors D1, D1 may be configured to be movable on both sides, or may be configured such that only one of the doors is movable relative to the other door.

A shield 15 (wall) is provided on the surface of the shield 13 on the side of the irradiation chamber 4 unit). The shield 15 constitutes a part of the inner wall surface of the irradiation chamber 4. The shield 15 is provided with an irradiation port 16 that serves as an entrance and exit of the neutron beam N. A collimator 14 is embedded in the irradiation port 16. The irradiation port 16 is opened in the X-axis direction, and the inner surface has a circular shape.

The preparation chamber 3 is a room for performing a required operation when irradiating the patient S with the neutron beam N in the irradiation chamber 4. In the preparation chamber 3, for example, the patient S is restrained at the treatment table 2, and the positional relationship between the collimator 14 and the patient S is adjusted. Therefore, the size of the preparation chamber 3 is a size that can be easily prepared by the worker around the treatment table 2 housed in the room. A pair of doors D2 and D2 capable of opening and closing are provided at the entrance and exit of the preparation chamber 3. The size of the entrance and exit of the preparation chamber 3 is, for example, the same size as the entrance and exit of the irradiation chamber 4. The entrance and exit of the preparation chamber 3 are also the same as the irradiation chamber 4, and it is preferable to narrow as much as possible. That is, in a state where the pair of doors D2, D2 are opened, the width of the opening M2 formed between the doors (the width of the pair of doors D2, D2 in the opening and closing direction) WD2 is smaller than the length of the longitudinal direction of the top plate 41. L.

Further, in the preparation chamber 3, a wall portion 17 for providing the treatment table 2 and the collimator 14 in the same state as when the neutron beam N is irradiated in the irradiation chamber 4 is provided. The wall portion 17 is provided with a virtual irradiation port 18 having the same shape as the irradiation port 16. When the setting is made, the collimator 14 is inserted into the virtual irradiation port 18. The method of aligning the straightener 14 with the patient S using the virtual illumination port 18 is described later.

The communication room 5 is a room that connects the preparation room 3 and the irradiation room 4 and moves the treatment table 2 in a state in which the patient S is restrained. The communication room 5 has a width that allows the treatment table 2 to pass. More specifically, the size of the communication room 5 is The size of the treatment table 2 in the state in which the longitudinal direction of the top plate 41 to be described later is along the Y-axis direction (the state of FIG. 4(c)) is sufficient. Further, in the present example, the width of the communication chamber 5 in the X-axis direction is smaller than the length L of the top plate 41 in the longitudinal direction. Therefore, in a state where the longitudinal direction of the top plate 41 is along the X-axis, the treatment table 2 cannot be made to pass through the communication chamber 5. The communication room 5 is also the same as the irradiation room 4, and should be narrowed as much as possible.

Further, the neutron capture treatment system 1 further includes a guide rail 19 for moving the treatment table 2 between the preparation chamber 3 and the irradiation chamber 4. The guide rail 19 extends from the inside of the preparation chamber 3 through the communication chamber 5 to the inside of the irradiation chamber 4, and is linearly arranged along the X-axis.

Next, the treatment table 2 will be described. Figure 3 is a diagram showing the treatment table 2. As shown in Fig. 3, the treatment table 2 includes a traveling portion 30 that travels along the ground F, a base portion 40 (first rotating portion) that has a top plate 41 (mounting portion) on which the patient S is placed, and a mounting plate The collimator mounting portion 50 (second rotating portion) of the straightener 14. The base portion 40 is provided on the traveling portion 30, and the collimator mounting portion 50 is provided on the base portion 40. That is, the top plate 41 and the collimator 14 are disposed on the running portion 30.

The traveling portion 30 has a base portion 31 that moves in the Y-axis direction along the floor surface F, and a traverse portion 33 that is disposed on the base portion 31 and that moves (traverses) in the X-axis direction with respect to the base portion 31. The outer shape of the base portion 31 has, for example, a rectangular parallelepiped shape. The base portion 31 is disposed at the lowermost portion of the treatment table 2 and moves on the guide rail 19. As a structure for realizing this movement, in the present example, the base portion 31 has a pair of driving portions 32 (second drawing). The drive unit 32 is driven by, for example, a belt mechanism or the like provided in the base portion 31. The base portion 31 is slidably moved along the guide rail 19 in accordance with an instruction from the control device.

The outer shape of the traverse portion 33 has, for example, a rectangular parallelepiped shape. As indicated by an arrow B in FIG. 2, the traverse portion 33 moves in the X-axis direction with respect to the base portion 31, whereby the base portion 40 and the collimator mounting portion 50 are oriented in the X-axis direction with respect to the base portion 31 (base portion). The moving direction of 31 is the direction orthogonal to the Y-axis direction). As a mechanism for the movement, in the present example, the traverse portion 33 has a pair of movement mechanisms 35 provided between the yaw portion 33 and the base portion 31. The moving mechanism 35 includes, for example, a guide rail provided on the base portion 31 along the X-axis direction, a slider provided on the lower surface of the traverse portion 33 and slidably engaged with the guide rail, and the like, in accordance with an instruction from the control device. The traverse portion 33 slides with respect to the base portion 31.

The base portion 40 has a top plate 41 on which the patient S is placed, an expansion-contraction portion 43 that supports the top plate 41, and a carriage portion 45 that supports the expansion-contraction portion 43. The top plate 41 is formed in a flat plate shape. For example, the outer shape of one side in the longitudinal direction has an arc shape, and the outer shape of the remaining portion has a rectangular shape. When the patient S in the lying state (recumbent position) is placed on the top plate 41, the head portion is placed in the arcuate portion. The length of the top plate 41 in the longitudinal direction is a length (for example, about 2 m) that allows the body of the patient S to lie down. The expansion and contraction portion 43 extends in the Z-axis direction and can expand and contract in the Z-axis direction in accordance with an instruction from the control device.

The truck portion 45 has, for example, a rectangular parallelepiped outer shape. The truck portion 45 has wheels 46 at the lower portion, and is detachable from the traverse portion 33 by the wheels 46 on the floor surface F. Further, the carriage portion 45 is traversed in a rotatable manner by the first rotation support mechanism (first rotation support portion) 47. The part 33 is supported. The first rotation support mechanism 47 is, for example, a rotation mechanism such as a built-in bearing, and rotates the carriage portion 45 (base portion 40) about the rotation axis A in accordance with an instruction from the control device. In other words, the first rotation support mechanism 47 supports the top plate 41 and the collimator 14 so as to be rotatable together with the traveling portion 30. In other words, the first rotation support mechanism 47 supports the top plate 41 and the collimator 14 so that both the top plate 41 and the collimator 14 can integrally rotate with respect to the traveling portion 30.

The collimator mounting portion 50 has a rising piece 51 extending in the Z-axis direction and a horizontal piece 53 extending in the horizontal direction. A collimator 14 is detachably attached to the upper end portion of the riser piece 51. One end portion of the horizontal piece 53 is connected to the lower end portion of the rising piece 51, and the other end portion is rotatably supported by the carriage portion 45 via the second rotation support mechanism (second rotation support portion) 55. In the present example, the rotation axis of the second rotation support mechanism 55 is the same as the rotation axis A of the first rotation support mechanism 47. The second rotation support mechanism 55 is, for example, a rotation mechanism such as a built-in bearing, and rotates the horizontal piece 53 (collimator attachment portion 50) about the rotation axis A in accordance with an instruction from the control device. That is, the collimator mounting portion 50 has the second rotation support mechanism 55 that supports the collimator 14 so as to be rotatable relative to the top plate 41, and supports the position of the collimator 14 with respect to the traveling portion 30. Straight 14.

Next, the treatment procedure performed by the neutron capture treatment system 1 will be described. Fig. 4 and Fig. 5 are schematic plan views showing the movement state of the treatment table at the time of treatment. First, a predetermined preparation operation is performed on the patient S before entering the neutron capture treatment system 1. Next, the patient S and the worker are placed in the preparation room 3, and the patient S is placed on the top plate 41. and Moreover, the operator binds the body of the patient S to the top plate 41 by means of a restraining member.

Thereafter, the operator adjusts the positional relationship between the irradiation target in the patient S and the collimator 14 to align the patient S with the collimator 14. Thereafter, the worker moves the traverse portion 33 toward the wall portion 17 side, and the collimator 14 is fitted into the virtual irradiation port 18 of the wall portion 17. Thereby, in the preparation chamber 3, the treatment table 2 and the collimator 14 are provided in the same state as when the neutron beam N is irradiated in the irradiation chamber 4. Fig. 4(a) shows an example of a state in which the installation is completed in the preparation room 3.

More specifically, when this setting is performed, the positional relationship of the collimator 14 with respect to the top plate 41 is adjusted by the rotation of the collimator mounting portion 50 (second rotation support mechanism 55), and the collimator 14 and the patient are performed. S alignment. Further, both the base portion 40 and the collimator mounting portion 50 are integrally rotated with respect to the traveling portion 30 by the rotation of the base portion 40 (the first rotation support mechanism 47), so that the center of the collimator 14 is on the X-axis. on. Next, the traverse portion 33 is moved toward the wall portion 17 side, and the collimator 14 is fitted into the virtual irradiation port 18. Further, the rotation of the base portion 40 and the rotation of the collimator mounting portion 50 may be performed simultaneously, or one of the rotations may be performed first. Further, at the time of installation, the positional relationship between the top plate 41 and the collimator 14 in the Z-axis direction is adjusted by the expansion and contraction of the elastic portion 43.

Next, the treatment table 2 is moved toward the irradiation chamber 4. First, as shown in FIG. 4(b), the traverse portion 33 moves toward one side away from the wall portion 17, and the collimator 14 is detached from the virtual irradiation port 18. Next, as shown in FIG. 4(c), the base portion 40 is rotated to become the length of the top plate 41. The state of the side direction along the Y-axis direction. In this state, the base portion 31 moves in the Y-axis direction, and the treatment table 2 is moved from the preparation chamber 3 through the communication chamber 5 to the irradiation chamber 4 (Fig. 5(a)). At this time, since the longitudinal direction of the top plate 41 is in the Y-axis direction, the entrance and exit of the preparation chamber 3 (the door D2), the entrance and exit of the irradiation chamber 4 (the door D1), and the inner wall of the communication chamber 5 are not combined with the top plate 41. Interfere with each other. Further, when the base portion 40 is rotated, since the base portion 40 is integrally rotated with the collimator mounting portion 50, the positional relationship between the top plate 41 and the collimator 14 is maintained in a state of being set.

Next, irradiation preparation of the neutron beam N is performed in the irradiation chamber 4. First, as shown in Fig. 5(b), the base portion 40 is rotated to the position at the time of installation (Fig. 4(a)). At this time, also, since the base portion 40 and the collimator mounting portion 50 are integrally rotated, the positional relationship between the top plate 41 and the collimator 14 is maintained at the state in which it is set. Next, as shown in FIG. 5(c), the traverse portion 33 moves toward the wall portion 17 side, and the collimator 14 is fitted into the irradiation port 16. Thereby, the state at the time of installation is accurately reproduced, and the collimator 14 and the patient S are arranged in a predetermined positional relationship. Thereafter, the neutron beam N is started to be directed toward the patient S.

As described above, in the treatment table 2 of the present embodiment, when the setting is performed, the positional relationship of the collimator 14 with respect to the top plate 41 (patient S) is adjusted by the collimator mounting portion 50, and the top plate 41 and the collimator are adjusted. 14 Alignment. Further, when the treatment table 2 is moved, the top plate 41 and the collimator 14 are rotated together with respect to the traveling portion 30 by rotating the first rotation support mechanism 47, so that the top plate 41 does not interfere with the door or the like of the preparation chamber 3. status. At this time, since the top plate 41 rotates integrally with the collimator 14, the top plate The positional relationship between the 41 and the collimator 14 does not change. Further, after the end of the movement, by rotating the first rotation support mechanism 47 to the position at the time of installation, it is possible to accurately reproduce the state at the time of installation. Therefore, according to the treatment table 2, the positional relationship between the collimator 14 and the patient S can be maintained and the treatment table 2 can be moved to the irradiation room 4.

In addition, the patient S can be aligned with the collimator 14 by, for example, having the head of the patient S directly contact the collimator 14, or having the head of the patient S approach the collimator 14 across a plurality of gaps. This is because if the gap between the head of the patient S and the collimator 14 is large, the neutron beam leaks from the gap, resulting in a decrease in the irradiation efficiency. When the patient S is brought into contact with or close to the collimator 14 in this manner, the collimator 14 is fixed to the base portion (the traveling portion 30) of the treatment table 2 as in the conventional neutron capture treatment system. Rotation of the top plate 41 with respect to the base portion may cause the top plate 41 to rotate while rubbing the head of the patient S on the top plate 41 with the collimator 14. At this time, there is a possibility that the posture of the patient S changes, for example, it is possible to cause the neck of the patient S to slightly tilt to change the direction of the head. If the posture of the patient S changes, even if the top plate 41 is rotated after moving the treatment table 2 to the irradiation chamber 4, the positional relationship between the patient S and the collimator 14 cannot be restored to the positional relationship at the time of setting.

In this regard, in the treatment table 2 of the present embodiment, when the treatment table 2 is moved, the top plate 41 and the collimator 14 are rotated together with respect to the traveling portion 30 by the first rotation support mechanism 47, so the top plate 41 and the standard The positional relationship of the straightener 14 does not change. Therefore, it is possible to suppress the friction between the head of the patient S and the collimator 14 as described above, causing the posture of the patient S to change. Chemical.

Further, in the treatment table 2 of the present embodiment, the collimator attachment portion 50 has a second rotation support mechanism 55 that supports the collimator 14 so as to be rotatable relative to the top plate 41. Thereby, the position of the collimator 14 with respect to the top plate 41 can be adjusted by the collimator mounting part 50 with a simple structure.

Further, in the treatment table 2 of the present embodiment, the rotation axis of the first rotation support mechanism 47 and the rotation axis of the second rotation support mechanism 55 are on the same straight line, regardless of whether the first rotation support mechanism 47 and the second rotation support mechanism are provided. Which of the 55 rotations and the collimator mounting portion 50 move on the same circumference, it is easy to align the position and posture of the collimator 14 with the irradiation port 16.

Further, in the treatment table 2 of the present embodiment, after the collimator 14 is placed at a predetermined position, the first rotation support mechanism 47 is moved in the X-axis direction by the traverse portion 33, whereby the collimator 14 can be embedded. Irradiation port 16. Therefore, the collimator 14 can be easily and accurately embedded in the irradiation port as compared with the case where the collimator 14 is embedded in the irradiation port 16 by a treatment table that can be moved in any direction on the floor F by, for example, a worker or the like. 16.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and modifications may be made without departing from the gist of the claims.

For example, in the above-described embodiment, the example in which the support base portion 40 is rotatable relative to the traveling portion 30 and supports the collimator mounting portion 50 so as to be rotatable relative to the base portion 40 has been described. However, it may be supported. The collimator mounting portion 50 is rotatable relative to the running portion 30 and supports the base portion 40 so as to be rotatable relative to the collimator mounting portion 50. Further, in the above-described embodiment, the example in which the rotation axis of the first rotation support mechanism 47 and the rotation axis of the second rotation support mechanism 55 are on the same straight line has been described, but the rotation axis of the first rotation support mechanism 47 and the second The rotation axes of the rotation support mechanism 55 may not be on the same straight line.

Further, in the above-described embodiment, the example in which the traverse portion 33 that moves the base portion 40 and the collimator mounting portion 50 in the X-axis direction has been described. However, the traverse portion 33 may not be provided. At this time, the treatment table 2 can be traversed by other moving mechanisms. Further, although the example in which the irradiation port 16 is opened in the X-axis direction and the traverse portion 33 moves the first rotation support mechanism 47 in the X-axis direction has been described, for example, the irradiation port 16 is opened in a direction crossing the Y-axis direction. When you move, you can move in that direction. In the above-described embodiment, the shape of the lying position of the patient S in the lying state is described as an example. However, the seat shape of the patient S in the sitting state may be placed.

Further, in the above-described embodiment, the collimator mounting portion 50 can adjust the position of the collimator 14 with respect to the top plate 41 by the second rotation support mechanism 55, but is not limited thereto. For example, the collimator mounting portion 50 may have a multi-joint arm capable of three-dimensional position adjustment, and the multi-joint arm adjusts the position of the collimator 14 with respect to the top plate 41. The multi-joint arm is configured, for example, such that a proximal end portion thereof is fixed to the base portion 40, a collimator 14 is attached to the distal end portion thereof, and the distal end portion is moved relative to the proximal end portion to adjust the collimator 14 with respect to the top plate 41. position.

Further, in the above-described embodiment, the door D1 is provided at the entrance and exit of the irradiation chamber 4, and the door D2 is provided at the entrance and exit of the preparation chamber 3. However, the door D1 may be provided on the irradiation chamber 4 side, and the preparation chamber 3 side may be omitted. Door D2.

2‧‧‧ treatment table (treatment table for neutron capture therapy)

14‧‧‧ collimator

19‧‧‧ rails

30‧‧‧ Walking Department

31‧‧‧ base

33‧‧‧ traverse

35‧‧‧Mobile agencies

41‧‧‧ top board

40‧‧‧Base section

43‧‧‧Flexing Department

45‧‧‧Train Department

46‧‧‧ Wheels

47‧‧‧1st rotation support mechanism (1st rotation support part)

50‧‧‧collimator installation

51‧‧‧ erected

53‧‧‧ horizontal film

55‧‧‧Second rotary support mechanism

A‧‧‧Rotary axis

S‧‧‧ patients (irradiated body)

F‧‧‧ Ground

Claims (6)

A neutron capture treatment treatment table for placing the object to be irradiated when performing neutron capture treatment for irradiating a neutron beam to an object to be irradiated, comprising: a walking portion that travels along the ground; and a top plate that is disposed on the The traveling portion is configured to mount the object to be irradiated; the collimator is provided on the traveling portion, and is provided with an opening for defining an irradiation range of the neutron beam; and a collimator mounting portion to be adjustable The collimator supports the collimator with respect to a position of the top plate; and the first rotation support portion supports the top plate and the collimator so as to be rotatable together with the running portion. The treatment table for a neutron capture treatment according to the first aspect of the invention, wherein the collimator attachment portion has a second rotation support portion that supports the collimator so as to be rotatable relative to the top plate. The treatment table for a neutron capture treatment according to the second aspect of the invention, wherein the rotation axis of the first rotation support portion and the rotation axis of the second rotation support portion are on the same straight line. The treatment table for neutron capture treatment according to any one of claims 1 to 3, wherein the traveling portion has a base portion that moves along the ground surface, and The first rotation support portion is moved to a traverse portion in a direction intersecting the movement direction of the base portion with respect to the base portion. A neutron capture treatment system for irradiating a neutron beam to an irradiated body, comprising: a treatment table for neutron capture therapy according to any one of claims 1 to 4; performing the aforementioned collimator a preparation chamber for adjusting the positional relationship with the object to be irradiated; an irradiation chamber for irradiating the neutron beam toward the object to be irradiated; and an irradiation port for the neutron beam provided in a wall portion of the irradiation chamber, wherein The sub-capture treatment treatment table is capable of traveling between the preparation chamber and the irradiation chamber. The neutron capture treatment system according to the fifth aspect of the invention, wherein the illuminating chamber and the preparation chamber are provided with a door for shielding radiation emitted from the inside of the irradiation chamber for neutron capture therapy The width of the opening formed by the opening of the door when the treatment table is passed is smaller than the length of the top plate in the longitudinal direction.