JP2012055701A - Accelerated particle irradiation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide accelerated particle irradiation equipment miniaturizable of a building in which the irradiation equipment is installed and capable of reducing the installation cost.SOLUTION: The accelerated particle irradiation equipment 1 includes an irradiation unit 3 having a rotation section 34 rotatable around a rotation axis P to irradiate accelerated particles generated in a particle accelerator, and a storage chamber 8 to store the irradiation unit 3. The rotation section of the irradiation unit 3 is structured to have swelling units 33b, 38 swelling outside in the radial direction from the rotation unit body 34. Radiation shielding walls 86, 87 of the storage chamber 8 is structured to have storage recess units 92, 91 storable the swelling units 33b, 38 to be circumferential parts of the rotation unit of the irradiation unit 3. Thus, the storage chamber 8 corresponding to the shape of the irradiation unit 3 can be realized and dimensions of the storage chamber 8 can be suppressed and a building 6 can be miniaturized.

Description

  The present invention relates to accelerated particle irradiation equipment including an irradiation device such as a rotating gantry for radiotherapy, and a structure of a storage chamber for storing the irradiation device.

  A facility for irradiating a patient with accelerated particles such as a proton beam to treat cancer is known. This kind of equipment is a cyclotron that generates accelerating particles, a rotatable irradiation device (rotating gantry) that irradiates the patient with accelerating particles from any direction, and an induction that guides the accelerating particles generated by the cyclotron to the irradiation device. Has a line. The rotating gantry includes a treatment table on which a patient lies, an irradiation unit that irradiates accelerated particles toward the patient, and an introduction line that introduces the accelerated particles guided by the guide line to the irradiation unit.

  The irradiation unit is configured to be rotatable with respect to the patient, and various modes are known for the form of the introduction line of the accelerated particles to the irradiation unit. For example, the introduction line (beam transport device 7) described in Patent Document 1 first has a connecting portion connected to the guide line on the rotation axis serving as the rotation center of the irradiation unit (irradiation device 8). It is curved in a substantially U shape on a plane passing through the rotation axis and is connected to the irradiation unit. In addition, the introduction line (delivery system 12) described in Patent Document 2 has a connecting portion connected to the induction line on the rotation axis, and is further curved so as to be twisted to the circumferential side of the rotation axis. It is linked to (nozzle32).

JP 2001-259058 A U.S. Pat. No. 4,917,344

  However, in the equipment provided with the rotating gantry described in Patent Document 1, it is difficult to shorten the path length of the introducing line in the rotating axis direction because it is necessary to appropriately guide and introduce the acceleration particles. Dimensional compression in the direction of the rotation axis was difficult. As a result, it is difficult to reduce the size of this type of rotating gantry, and a large installation space for storing the rotating gantry is required, resulting in an increase in the size of the facility, making it difficult to reduce the equipment cost. In addition, in the facility described in Patent Document 2, there is no consideration regarding the arrangement of the rotating gantry in the building, which is not sufficient for avoiding an increase in facility size and reducing facility cost.

  An object of the present invention is to solve the above problems, and to provide an accelerated particle irradiation facility that can reduce the size of a building in which an irradiation device is installed and is effective in reducing facility costs. And

  The present invention relates to an accelerated particle irradiation facility for irradiating accelerated particles, having an irradiating device for irradiating accelerated particles generated by a particle accelerator while having a rotating part that can rotate around a rotation axis, and a storage chamber for storing the irradiating device And the rotating part of the irradiation device has a projecting part that projects outward in the radial direction from the main part of the rotating part, and the radiation shielding wall of the storage chamber has a projecting part serving as a peripheral part of the rotating part. Is formed along the rotation direction of the overhanging portion, and is covered with a shield member that is a material different from the radiation shielding wall.

  The irradiation apparatus of the accelerated particle irradiation equipment according to the present invention includes a rotating part that can rotate around a rotation axis, and the rotating part has a projecting part that protrudes radially outward from the rotating part body. The radiation shielding wall of the storage chamber that stores the irradiation device is formed with a storage recess that can store a protruding portion that is a peripheral portion of the rotating portion. And since the accommodation recessed part is formed along the rotation direction of the overhang | projection part, the movement space which can move the peripheral part of a rotation part is securable. Thereby, the accommodation recessed part which can accommodate the overhang | projection part of a rotation part is formed, and the storage chamber corresponding to the shape of an irradiation apparatus is realizable. Therefore, it is possible to reduce the dimensions of the storage room, and the building can be downsized. As a result, the construction cost of the building can be reduced and the equipment cost can be reduced. By reducing the size of the building, for example, the amount of concrete used for the radiation shielding wall can be reduced, so that the construction cost of the building can be reduced. For example, lead, heavy concrete, etc. are mentioned as said another material. Although heavy concrete is more expensive than ordinary concrete, it has high radiation shielding properties. Therefore, when heavy concrete is used as the shield member, the thickness of the shield member can be reduced. For example, it can be about 2/3 of the conventional thickness. Moreover, construction can be facilitated by modularizing the shield member as a unit part.

  The shield member is preferably formed by laminating a plurality of plate-like members.

  Moreover, it is preferable that the wall part of a storage chamber is formed with concrete, and the shield member is formed with heavy concrete.

  Moreover, it is preferable that an irradiation apparatus is provided with the circumferential direction introduction line which curves in the circumferential direction and introduces an acceleration particle to an irradiation part as an overhang | projection part, and an accommodation recessed part can accommodate the circumferential direction introduction line. By adopting a configuration including a circumferential introduction line that curves so as to be twisted in the circumferential direction, the length of the overhanging portion in the rotation axis direction can be shortened, and the width of the housing recess in the rotation axis direction can be increased. Is prevented.

  ADVANTAGE OF THE INVENTION According to this invention, size reduction of the building in which an irradiation apparatus is installed can be achieved, and it is effective for reduction of equipment cost.

It is an arrangement plan of particle beam therapy equipment concerning an embodiment of the present invention. It is a side view of the particle beam therapy equipment concerning the embodiment of the present invention. 1 is a perspective view showing a rotating gantry according to an embodiment of the present invention. It is the schematic sectional drawing which cut the rotation gantry concerning the embodiment of the present invention in the horizontal direction along the axis of rotation. It is a top view which expands and shows the gantry chamber which concerns on embodiment of this invention. It is sectional drawing which cut the gantry chamber shown in FIG. 5 along the long side direction X, and is the figure seen from the back side of the building. FIG. 6 is a cross-sectional view of the gantry chamber shown in FIG. 5 cut along a vertical plane including a rotation axis, as viewed from the side of the rotary gantry. FIG. 6 is a cross-sectional view of the gantry chamber shown in FIG. 5 cut along a plane orthogonal to the rotation axis, as viewed from the back side of the rotary gantry. It is a figure which shows the construction procedure of the shield member which shields the notch structure of a ceiling.

  Hereinafter, a preferred embodiment of an accelerated particle irradiation facility according to the present invention will be described with reference to the drawings. In the present embodiment, a case where the accelerated particle irradiation facility is a particle beam treatment facility will be described. The particle beam treatment facility is applied to, for example, cancer treatment, and is a device that irradiates a tumor (irradiation target) in a patient's body with a proton beam (accelerated particles).

  As shown in FIGS. 1 and 2, a particle beam treatment facility 1 includes a cyclotron (particle accelerator) 2 that generates a proton beam, and a rotatable rotating gantry (irradiation apparatus) that irradiates a patient with a proton beam from an arbitrary direction. 3) A guide line 4 for guiding the proton beam generated by the cyclotron 2 to the rotating gantry 3 is provided. The particle beam therapy system includes the cyclotron 2, the rotating gantry 3, and the guide line 4 as respective devices. The particle beam therapy facility 1 includes a building 6 in which each device of the particle beam therapy system is arranged.

  The particle beam therapy system will be described. The proton beam generated by the cyclotron 2 is routed along the guide line 4 and guided to the rotating gantry 3. The guide line 4 is provided with a deflecting magnet for changing the path of the proton beam.

  FIG. 3 is a perspective view showing the rotating gantry, and FIG. 4 is a schematic sectional view of the rotating gantry cut in the horizontal direction along the rotation axis. The rotating gantry 3 includes a treatment table 31 on which a patient lies (see FIG. 7), an irradiation unit 32 that irradiates the patient with a proton beam, and an introduction line 33 that introduces the proton beam guided by the guide line 5 into the irradiation unit 32. I have.

  The rotating gantry 3 is rotatable and includes a first cylindrical portion 34, a cone portion 35, and a second cylindrical portion 36 in order from the front side. The first cylindrical portion 34, the cone portion 35, and the second cylindrical portion 36 are coaxially arranged and connected. The irradiation part 32 of the rotating gantry 3 is disposed on the inner surface of the first cylindrical part 34 and is directed in the axial direction of the first cylindrical part 34. A treatment table 31 (not shown in FIGS. 3 and 4) is disposed at the axial center of the first cylindrical portion 34. The second cylindrical portion 36 has a smaller diameter than the first cylindrical portion 34, and the cone portion 35 is formed in a conical shape so as to connect the first cylindrical portion 34 and the second cylindrical portion 36.

  A front ring 39 a is installed on the outer peripheral portion of the front end of the first cylindrical portion 34, and a rear ring 39 b is installed on the outer peripheral portion of the rear end of the first cylindrical portion 34. As shown in FIG. 8, the first cylindrical portion 34 is rotatably supported by a roller device 40 disposed below the first cylindrical portion 34. The outer peripheral surfaces of the front ring 39a and the rear ring 38b abut against the roller device 40, and a rotational force is applied by the roller device 40.

  A guide line 4 for guiding the proton beam to the rotating gantry 3 is connected to the back side of the rotating gantry 3. The guide line 4 is connected to the irradiation unit 32 via the introduction line 33. The introduction line 33 includes two sets of 45 degree deflection magnets and two sets of 135 degree deflection magnets. The introduction line 33 includes a radial introduction line 33a extending in the radial direction and a circumferential introduction line 33b extending in the circumferential direction, following the radial introduction line 33a.

  The radial introduction line 33a is arranged in the direction of the rotation axis P in the second cylindrical portion 36, and then bent by 90 degrees (45 degrees × 2 times) from the direction of the rotation axis P as shown in FIG. It is directed outward in the direction, proceeds outward in the radial direction, and protrudes outside the first cylindrical portion 34. As shown in FIG. 3, the circumferential introduction line 33 b is bent 135 degrees from the radial direction and travels upward in the circumferential direction, and then is bent 135 degrees radially inward and directed radially inward. ing.

  The circumferential introduction line 33 b is arranged in the circumferential direction at a position spaced outward from the outer circumferential surface of the first cylindrical portion 34 on the outer surface of the first cylindrical portion 34. A pedestal 37 that supports the circumferential introduction line 33 b is provided on the outer peripheral surface of the first cylindrical portion 34. The gantry 37 is formed so as to protrude outward in the radial direction, and supports the circumferential introduction line 33b.

  In addition, a counterweight 38 is provided on the outer peripheral surface of the first cylindrical portion 34 so as to face the rotation axis P. The counterweight 38 is installed so as to protrude outward from the outer peripheral surface of the first cylindrical portion 34. By installing the counterweight 38, a weight balance with respect to the introduction line 33 and the mount 37 disposed on the outer surface of the first cylindrical portion 34 is ensured. The length from the rotation axis P to the outer edge of the counterweight 38 is preferably shorter than the length from the rotation axis P to the outer edge of the introduction line 33.

  The rotating gantry 3 is driven to rotate by a motor (not shown), and the rotation is stopped by a brake device (not shown). A portion including the first cylindrical portion 34, the introduction line 33, and the counterweight 38 corresponds to the rotating portion of the rotating gantry 3. Further, the rotating part body is, for example, a cylindrical body whose axis is disposed along the rotation axis, and has an outer peripheral surface on the same circumference over the entire circumference, or on the same circumference over the entire circumference. In the present embodiment, the first cylindrical portion 34 corresponds to the rotating portion main body.

  Further, the circumferential direction introduction line 33b and the counterweight 38 correspond to an overhanging portion that projects outward in the radial direction from the rotating portion main body. In the present embodiment, the introduction line 33 arranged on the outer surface side of the first cylindrical portion 34 corresponds to a protruding portion that becomes the peripheral portion of the rotating portion. When the length from the rotation axis P to the outer edge of the counterweight 38 is the same as the length from the rotation axis P to the outer edge of the circumferential introduction line 33b, or the length from the rotation axis P to the outer edge of the counterweight 38 is the circumferential introduction line. When it is longer than the length to the outer edge of 33b, the counterweight 38 corresponds to an overhanging portion that becomes the peripheral portion of the rotating portion.

  In addition, the rotating gantry 3 of the present embodiment is formed in a thin shape in which the length L1 in the front-rear direction is shorter than the maximum outer diameter of the rotating portion (the diameter of the circular orbit R1, see FIG. 8). The length L1 in the front-rear direction is, for example, the length L1 from the front end of the first cylindrical portion 34 to the rear end of the second cylindrical portion 36. The maximum outer diameter of the rotating portion is a portion corresponding to the length r1 from the rotation axis P to the outer edge of the circumferential introduction line 33b (maximum outer diameter = radius r1 × 2). In addition, the structure corresponding to the length from the rotating shaft P to the outer edge of the counterweight 38 may be the maximum outer diameter.

  Next, the building 6 will be described. As shown in FIGS. 1 and 2, the building 6 is provided with a cyclotron chamber 7 in which the cyclotron 2 is disposed, a gantry chamber 8 in which the rotating gantry 3 is disposed, and a communication passage 9 in which the guide line 4 is disposed. . The building 6 is, for example, a reinforced concrete structure or a steel concrete structure, and each room is partitioned by a concrete radiation shielding wall. The building 6 of this embodiment is formed in a rectangular shape in plan view. In each figure, the long side direction of the building 6 is shown as the X direction, the short side direction of the building 6 is shown as the Y direction, and the height direction of the building 6 is shown as the Z direction. The upper side in FIG. 1 will be described as the front side of the building 6.

  The cyclotron chamber 7 is disposed, for example, at one end of the long side direction X of the building 6. The cyclotron chamber 7 has a rectangular shape in plan view and is surrounded by a (radiation) shielding wall 71. The front wall and the back wall of the cyclotron chamber 7 are arranged along the long side direction X of the building 6, and the side walls of the cyclotron chamber 7 are arranged along the short side direction Y of the building 6. One side wall of the cyclotron chamber 7 also serves as the side wall of the building 6 and also serves as the back wall of the cyclotron chamber 7.

  The cyclotron 2 is disposed on the front side of the cyclotron chamber 7, and the proton beam generated by the cyclotron 2 is led out from the back side of the cyclotron 2. A communication chamber 9 is connected to the back side of the cyclotron chamber 7.

  The communication room 9 extends from the cyclotron room 7 in the long side direction X of the building 6. The communication chamber 9 is disposed adjacent to the back side of the plurality of gantry chambers 8. In the present embodiment, the communication room 9 is arranged on the most back side of the building 6. The communication room 9 is partitioned by a radiation shielding wall, and the shielding wall on the back side of the communication room 9 extending in the long side direction X also serves as the back wall of the building 6. On the other hand, the shielding wall on the front side of the communication chamber 9 extending in the long side direction X also serves as the back wall of the gantry chamber 8. The guide line 4 extending in the long side direction X in the communication chamber 9 is branched at a predetermined position. The branched guide line 4 extends at a predetermined angle with respect to the long side direction X and is led to each gantry chamber 8. The communication chamber 9 may be configured to form an accommodation space for accommodating the guide line 4 along the branched guide line 4.

  The plurality of gantry chambers 8 are arranged adjacent to each other in the long side direction X of the building 6. The plurality of gantry chambers 8 are arranged adjacent to the front side of the communication chamber 9. Further, as shown in FIG. 1, the leftmost gantry chamber 8 is disposed adjacent to the cyclotron chamber 7. The length in the long side direction X of the gantry chamber 8 is approximately the same as the length in the long side direction X of the adjacent gantry chamber 8. Further, on the front side of the gantry chamber 8, a maze-shaped passage that communicates with the gantry chamber 8 is formed.

  FIG. 5 is an enlarged plan view showing the gantry chamber 8. As shown in FIG. 5, the gantry chamber 8 is formed in a substantially rectangular shape in plan view. For example, the gantry chamber 8 is formed in a pentagonal shape in which one corner of a quadrilateral is cut, and is formed in a substantially rectangular shape. The gantry chamber 8 of the present embodiment has a pentagonal shape with a corner on the back side on the left side of the figure cut. The gantry chamber 8 is partitioned by a radiation shielding wall.

  The gantry chamber 8 includes a front wall 81, a right side wall 82, a left side wall 83, a first back wall 84, and a second back wall 85 as radiation shielding walls. The front wall 81 is arranged on the front side and extends in the long side direction X. The front wall 81 is formed with an entrance that allows entry into the gantry chamber 8. The right side wall 82 and the left side wall 83 are arranged to face each other and extend in the short side direction Y. The right side wall 82 and the left side wall 83 have different lengths in the short side direction Y, and the right side wall 82 is longer than the left side wall 83. The right side wall 82 extends to the back side from the left side wall 83 in the short side direction Y.

  The first back wall 84 is disposed on the back side, extends in the long side direction X, and faces the front wall 81. The first back wall 84 is formed from the end on the back side of the right side wall 82, and is formed up to the point beyond the center of the gantry chamber 8 in the long side direction X.

  The second back wall 85 is disposed on the back side and extends in a direction intersecting the left side wall 83 and the first back wall 84. The second back wall 85 is formed from the left end of the first back wall 84 to the back side end of the left wall 83. The second back wall 85 is disposed so as to be inclined by approximately 45 degrees with respect to the left side wall 83 and the first back wall 84.

  In such a gantry chamber 8, the diagonal line P 1 P 2 connecting the intersection point P 1 between the front wall 81 and the left side wall 83 and the intersection point P 2 between the right side wall 82 and the first back wall 84 is the maximum width of the gantry chamber 8. This is the part. In the gantry chamber 8, the diagonal line P <b> 1 </ b> P <b> 2 intersects with the long side direction X and the short side direction Y at approximately 45 degrees. Further, in the gantry chamber 8 of the present embodiment, the second back wall 85 is formed so as to form a plane parallel to the diagonal line P1P2.

  Here, in the particle beam therapy facility 1 of the present embodiment, the portion having the maximum width of the rotating gantry 3 is arranged along the maximum width of the installation space of the rotating gantry 3. For example, the rotation trajectory of the point (the outer edge of the rotating part of the rotating gantry 3) located farthest from the rotation axis P of the rotating gantry 3 is arranged in a plane on the diagonal line P1P2. Note that “on the diagonal line P1P2” includes those arranged in a diagonal direction in a plan view, and includes cases where they are slightly deviated from the diagonal line P1P2.

  In the rotating gantry 3 of the present embodiment, the rotation axis P is arranged with the long side direction X and the short side direction Y and a predetermined inclination angle θ. Specifically, the rotation axis P of the rotating gantry 3 has an inclination angle of about 45 degrees with the long side direction X.

  The back side of the rotating gantry 3 is disposed so as to face the second back wall 85, and the front side of the rotating gantry 3 is directed to the entrance of the gantry chamber 8. The entrance of the gantry chamber 8 is provided at a corner portion formed by the front wall 81 and the right side wall 82. In addition, a region having a triangular shape in plan view is formed on the front surface of the rotating gantry 3.

  Further, for example, as shown in FIG. 5, the rotating gantry 3 is arranged such that the oblique side forming the outer edge of the cone portion 35 is parallel to the left side wall 83 and the first back wall 84 in a plan view. .

  6 to 8 are views showing a cross section of the gantry chamber and an arrangement of the rotating gantry in the gantry chamber. The gantry chamber 8 includes a ceiling 86 and a floor 87 as radiation shielding walls, as shown in FIGS.

  As shown in FIG. 7, the floor 87 of the gantry chamber 8 is provided with a plurality of steps, and is formed at a position lower than the first floor surface 87a formed on the front surface of the rotating gantry 3 and the first floor surface 87a. A second floor surface 87b on which the support portion of the base 31 is disposed, and a third floor surface 87c that is formed at a position lower than the second floor surface 87b and on which the support portion of the rotating gantry 3 is disposed are formed.

  Here, the radiation shielding wall of the gantry chamber 8 of the present embodiment corresponds to the orbit R1 (see FIG. 8) of the introduction line 33 which is the rotating part of the rotating gantry 3 and / or the orbit R2 of the counterweight 38. Notch structures 91 and 92 are formed at the positions.

  The notch structure 91 is formed on the floor 87 at a position corresponding to the orbit R1 of the introduction line 38 of the rotating gantry 3 and / or the orbit R2 of the counterweight 38. The notch structure 91 is a space that is recessed below the third floor surface 87c, and forms a moving space in which the introduction line 33 and / or the counterweight 38 of the rotating gantry 3 moves. The notch structure 91 is formed along a diagonal line P1P2 (rotation direction of the overhanging portion) in plan view.

  The notch structure 92 is formed on the ceiling 86 at a position corresponding to the orbit R1 of the introduction line 33 of the rotating gantry 3 and / or the orbit R2 of the counterweight 38. The notch structure 92 is a space recessed upward in the ceiling 86, and forms a moving space in which the introduction line 33 and / or the counterweight 38 of the rotating gantry 3 moves. The notch structure 92 is formed along a diagonal line P1P2 (rotation direction of the overhanging portion) in plan view.

  Further, the notch structure 92 is opened through the ceiling 86 (the ceiling of the building 6), and this opening is formed outside the gantry chamber 8 (building 6) by a shield member 93 made of a material different from the ceiling 86. It is coated from. The shield member 93 is formed, for example, by laminating a plurality of lead shielding plates 93a. Note that a concrete shielding plate may be laminated as the shielding member 93. For example, it is good also as a shield member which is not a plate shape but a block body.

  The shield member 93 may be made of heavy concrete as another material. The shield member 93 made of heavy concrete is expensive compared to the shield member 93 made of ordinary concrete, but has high radiation shielding properties. For example, when a shield member made of heavy concrete is used, the thickness can be about 2/3 as compared with a case where a shield member made of ordinary concrete is used. Moreover, construction can be facilitated by using a shield member 93 that is modularized as a plate-like component.

  Further, since the notch structure 92 is formed as an opening penetrating the ceiling 86, it can be used as a carry-in port for carrying parts of the rotating gantry 3.

  Next, with reference to FIG. 9, the construction procedure of the shield member 93 will be described. FIG. 9 shows only a part of the ceiling 86 in which the notch structure 92 is formed. As shown in FIG. 9A, the gantry loading opening (notch structure 92) provided in the ceiling 86 is a straight type and is not provided with a step. That is, the side wall of the opening is formed in a straight line in the vertical direction.

  Then, as shown in FIG. 9B, a plurality of shielding plates 93a are stacked on the notch structure 92, and finally, the plurality of shielding plates 93a are fixed to the outer surface of the ceiling 86 using an anchor or the like. As shown in FIG. 9C, the notch structure 92 is shielded.

  Further, since the notch structure 92 penetrates in the vertical direction and no step is provided on the side wall of the notch structure 92, when the parts of the rotating gantry 3 are carried in, the parts to be carried hit the step and are damaged. Is prevented.

  In such an embodiment, since the thin rotary gantry 3 has a maximum thickness in the direction of the rotation axis, and this portion is disposed along the diagonal line P1P2 of the gantry chamber 8, Installation space can be used effectively. Thereby, since the vertical and horizontal dimensions of the gantry chamber 8 can be shortened, the dimensions of the long side direction X and the short side direction Y of the building 6 can also be shortened, and the building 6 is downsized. As a result, the construction cost of the building 6 is reduced. Moreover, the installation space can be effectively used, and the particle beam therapy facility 1 can be constructed in a site that is narrower than before.

  In the building 6 of the present embodiment, in the plan view, the rotation axis is arranged so as to have an inclination angle of 45 degrees with respect to the long side direction X and the short side direction Y. Therefore, in the long side direction X of the building 6 It is possible to reduce the equipment by 5 m per rotating gantry. When three rotating gantry 3 are arranged in parallel in the long side direction X, the equipment can be reduced by 15 m.

  Further, according to the particle beam therapy facility 1 of the present embodiment, the shielding wall of the ceiling of the building 6 is partially corresponding to the peripheral portion of the introduction line 33 and / or the counterweight 38 which is the rotating part of the rotating gantry 3. Since only the notch structure is used, when the rotating portion of the rotating gantry 3 rotates, the notch structures 91 and 91 are moved. Thereby, the movement space of the overhang | projection part used as the peripheral part of the rotation gantry 3 can be ensured, and the gantry chamber 8 corresponding to the shape of the rotation gantry 3 can be implement | achieved. Therefore, the height dimension of the gantry chamber 8 can be suppressed. That is, the ceiling 86 can be lowered, an unnecessary space above the gantry chamber 8 can be eliminated, and the building 6 can be downsized. As a result, the construction cost of the building 6 can be reduced.

  In the present embodiment, the rotating gantry 3 includes a circumferential introduction line 33b that curves in the circumferential direction and introduces accelerated particles to the irradiation unit 32 as the projecting portion, and the notch structure 92 includes the circumferential introduction line 33b. Can be accommodated. Since the rotating gantry 3 is thus configured to include the circumferential introduction line 33b that is curved so as to be twisted in the circumferential direction, the length of the overhanging portion in the rotational axis direction can be shortened. The width in the rotation axis direction can be reduced.

  In FIG.1 and FIG.2, the magnitude | size of the conventional building is shown with the dashed-dotted line as a comparison object. Conventionally, for example, in the case of a building equipped with three rotating gantry, the size of the building is about 68m in width X1 which is the length in the long side direction X, and about 33m in depth Y1 which is the length in the short side direction Y. The height Z1 which is the length in the height direction Z was about 18 m. On the other hand, in the case of the building 6 of the present embodiment, the size of the building 6 is such that the width X0 that is the length in the long side direction X is about 53 m, the depth Y1 that is the length in the short side direction Y is about 26 m, and the height direction. The height Z1, which is the length of Z, was about 15 m. In the building 6 of this embodiment, when compared with a conventional building, the building volume can be reduced by about 50%, and the equipment cost can be greatly reduced.

  Also, by adopting this layout, a triangular area of about 7 m × 7 m can be secured in the gantry chamber 8, and this area can be effectively used as a treatment space. Moreover, you may install the online PET system provided with the C-type arm which protrudes from the ceiling part to the rotation gantry 3 using this space.

  A known online PET system is a technology that images changes in the shape of the affected area after treatment, and acquires PET images by detecting short-lived positron nuclides released from the patient's body immediately after proton irradiation. System. Thereby, the shape change of the target tumor by proton beam irradiation can be caught with high accuracy, and proton beam irradiation to a normal tissue can be prevented. As a result, the accuracy of proton beam treatment can be further improved.

  Thus, by arranging the rotating gantry 3 at an angle, it becomes possible to effectively use the space and improve the degree of freedom of the equipment.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment. In the above-described embodiment, the pentagonal gantry chamber 8 is formed by cutting one corner of a quadrangle in plan view, but other shapes of the gantry chamber 8 may be used. For example, it may be a square gantry chamber, other polygons such as a hexagon, and the corner may be rounded. Moreover, the shielding wall which faces may not be arrange | positioned in parallel.

  Further, a gantry chamber in which a notch structure is provided on a side wall or the like may be used.

  Moreover, in the said embodiment, although the notch structure 92 provided in the ceiling 86 is formed so that it may penetrate the ceiling 86 in a height direction, the notch structure 92 does not penetrate the ceiling 86. But you can.

  Moreover, in the said embodiment, although it is set as the gantry chamber 8 which accommodates the thin rotation gantry 3, the notch structure which forms the movement space of a rotation part in the shielding wall of the gantry chamber 8 which accommodates the conventional rotation gantry. It may be formed.

  In the accelerated particle irradiation facility according to one embodiment, a housing recess is formed in the radiation shielding wall on the ceiling of the housing room. Since the movement space which can move the peripheral part of a rotation part is ensured in the radiation shielding wall of the ceiling of a storage room, the ceiling of a storage room can be made low. Therefore, unnecessary space above the storage chamber can be eliminated, and the height dimension of the storage chamber can be suppressed. Thereby, the height dimension of a building can be restrained and it can reduce in size, and equipment cost can be reduced.

  In the accelerated particle irradiation facility according to one embodiment, the accommodation recess is an opening that penetrates the radiation shielding wall, and the opening is covered from the outside of the radiation shielding wall by a shield member. Thereby, since the opening part which penetrates a radiation shielding wall is formed, when assembling an irradiation apparatus in a storage chamber, the components of an irradiation apparatus can be carried in into a storage room through an opening part. Moreover, since the opening is covered from the outside of the radiation shielding wall by the shield member, leakage of radiation from the opening is prevented.

  A storage chamber structure according to an embodiment is a storage chamber structure that stores an irradiation device that irradiates accelerated particles, and the irradiation device includes a rotating portion that can rotate around a rotation axis, and the rotating portion is a rotating portion main body. The housing recess has a projecting portion that projects outward in the radial direction, and the radiation shielding wall of the storage chamber is formed with a housing recess that can accommodate the projecting portion serving as the peripheral portion of the rotating portion. , And is formed along the rotation direction of the overhanging portion.

  A storage chamber structure according to an embodiment is a room for storing the irradiation device, and the irradiation device includes a rotation unit that can rotate around a rotation axis, and the rotation unit is stretched radially outward from the rotation unit main body. It has an overhang part to be put out. According to the storage room structure of the present invention, the radiation shielding wall of the storage room is formed with an accommodation recess (notch structure) that can accommodate an overhanging portion that becomes the peripheral portion of the rotation part of the irradiation device. It is possible to secure a moving space in which the peripheral portion of the part can move. Thereby, the accommodation recessed part which can accommodate the overhang | projection part of a rotation part is formed, and the storage chamber corresponding to the shape of an irradiation apparatus is realizable. Therefore, it is possible to reduce the dimensions of the storage room, and the building can be downsized. As a result, the construction cost of the building can be reduced and the equipment cost can be reduced. By reducing the size of the building, for example, the amount of concrete used for the radiation shielding wall can be reduced, so that the construction cost of the building can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Particle beam treatment equipment (accelerated particle irradiation equipment), 2 ... Cyclotron (particle accelerator), 3 ... Rotating gantry (thin type irradiation device), 4 ... Induction line, 6 ... Building, 7 ... Cyclotron room, 8 ... Gantry room ( Storage room), 9 ... Communication room, 32 ... Irradiation part, 33 ... Introduction line, 33b ... Circumferential introduction line (overhang part), 34 ... First cylindrical part (rotary part body), 38 ... Counterweight (overhang) Part), 86 ... ceiling (radiation shielding wall), 87 ... floor (radiation shielding wall), 91, 92 ... notch structure (accommodating recess), 93 ... shield member, P ... rotating axis, P1P2 ... diagonal (of installation space) Maximum width), R1... Maximum outer diameter (portion that becomes the maximum width of the rotating gantry), X... Long side direction, Y.

Claims (4)

In accelerated particle irradiation equipment that irradiates accelerated particles,
An irradiation device that irradiates the accelerated particles generated by the particle accelerator and having a rotating part that is rotatable around a rotation axis;
A storage chamber for storing the irradiation device,
The rotating part of the irradiation device has an overhanging part that protrudes outward in the radial direction from the rotating part main body,
On the radiation shielding wall of the storage chamber, an accommodation recess that can accommodate the overhanging portion that is a peripheral portion of the rotating portion is formed,
The accelerating particle irradiation facility, wherein the housing recess is formed along a rotation direction of the overhang and is covered with a shield member that is a material different from the radiation shielding wall. The accelerated particle irradiation equipment according to claim 1, wherein the shield member is formed by laminating a plurality of plate-like members. The wall of the storage chamber is made of concrete,
The accelerated particle irradiation facility according to claim 1, wherein the shield member is made of heavy concrete. The irradiation device includes a circumferential introduction line that curves in the circumferential direction and introduces the accelerated particles to the irradiation unit as the overhanging portion,
The accelerated particle irradiation equipment according to any one of claims 1 to 3, wherein the storage recess is capable of storing the circumferential introduction line.

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