JP2015003259A - Particle ray radiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a particle ray radiation device capable of radiation to an object to be radiated by selectively switching between a broad beam method and a spot scanning method.SOLUTION: In a particle ray radiation device, a radiation device for radiating incident particle ray is disposed in a rotation frame where it is rotatably driven with a radiation reference point as a rotational center, the radiation device selects a broad beam method to radiate a part of an object to be radiated, and selects a spot scanning method to radiate other portion of the object to be radiated.

Description

  The present invention relates to a particle beam irradiation apparatus for irradiating particle beams such as carbon ions and protons for research and cancer treatment.

  In order to irradiate particle beams of carbon ions, protons and the like from all angles, various types of particle beam irradiation devices called so-called rotary gantry have been proposed as particle beam irradiation devices (for example, Patent Document 1 and Patent Document 2).

  The configuration of a rotary irradiation type particle beam irradiation apparatus will be briefly described with reference to Patent Document 2. FIG. 7 is an overall configuration diagram showing a conventional rotary irradiation type particle beam irradiation apparatus, and FIG. 8 is a partial side view seen from the direction of the rotation axis in the direction of the arrow in the line VIII-VIII in FIG.

  In each of these drawings, reference numeral 1 denotes a rotating frame having a truss structure and having a barrel shape, and a counter balance 2 is attached to the rotating frame 1 in order to correct the unbalanced center of gravity of rotation. A rotating ring 3 is provided on the upstream side and the downstream side in the beam incident direction of the rotating frame 1, and the rotating ring 3 is fixed to the rotating frame 1. The support device 4 plays a role of supporting and driving the weight of the whole particle beam irradiation apparatus (excluding the support device 4 itself) via the rotating ring 3, and includes a single or a plurality of drive rollers 4A and a plurality of support rollers 4B. And is arranged on the outer peripheral lower surface of each rotating ring 3. The driving roller 4 </ b> A supports the weight of the particle beam irradiation apparatus and applies a driving force to the entire particle beam irradiation apparatus via the rotating ring 3 by a frictional force between the support surface and the outer peripheral surface of the rotating ring 3. The number depends on the weight of the particle beam irradiation apparatus, the capacity of the drive source, and the like. The support roller 4B supports the weight of the entire particle beam irradiation apparatus except the support device 4 itself, and freely rotates following the rotation of the rotating ring 3.

  The support surface of the support device 4 is in contact with the outer peripheral surface of the rotating ring 3, and the accuracy of the rotation center is determined by the accuracy of the rotational symmetry of the support surface of the support device 4 and the position of the entire particle beam irradiation device. This greatly depends on the accuracy of rotational symmetry of the outer peripheral surface of the rotating ring 3 serving as a reference surface.

  The driving device (motor or the like) 5 is connected to the driving roller 4A and performs rotational driving or rotational braking. The vacuum duct 6 is a passage for guiding charged particles accelerated by a particle accelerator (not shown) to irradiate the affected part, and the deflection electromagnets 7 and 8 play a role of deflecting the particle beam to a predetermined angle. A particle beam irradiation path composed of the vacuum duct 6 and the deflecting electromagnets 7 and 8 is formed. The beam irradiation device 9 is supplied with a particle beam through a particle beam irradiation path composed of a vacuum duct 6 and deflecting electromagnets 7 and 8, and arranges the irradiation region of the particle beam into an irradiation field shape suitable for treatment or changes energy. Or irradiating the affected area. The cone frame 10 is for supporting an electromagnet or the like inside and a cable or the like outside. The vacuum duct 6, the deflecting electromagnets 7 and 8, the beam irradiation device 9, and the cone frame 10 are integrated with the rotating frame 1. It can rotate at any angle, and irradiation from any angle is possible. The vacuum duct 6 is connected to a vacuum duct (not shown) outside the particle beam irradiation apparatus through which a particle beam emitted from a particle accelerator (not shown) passes through a rotary joint or the like, and the rotation of the particle beam irradiation apparatus. It can rotate around its axis. Reference numeral 11 denotes a bed structure for laying a patient to be treated, and is arranged so that the affected part of the patient is located on the rotation center axis of the particle beam irradiation apparatus. A beam 12 is inserted into the rotary frame 1 from the outside, and the bed structure 11 is fixed to the beam 12. Reference numeral 13 denotes a space secured in the rotating frame 1, in which irradiation is performed.

  Next, the operation of a conventional rotary irradiation type particle beam irradiation apparatus will be described. Now, when the driving roller 4A is rotated by the driving device 5, the driving force is transmitted through the frictional force between the contact surfaces of the driving roller 4A and the rotating ring 3, and the entire particle beam irradiation apparatus including the rotating frame 1 is transmitted. Rotate to the optimum angle for irradiation. At this time, the vacuum duct 6, the deflecting electromagnets 7 and 8, the beam irradiation device 9, and the cone frame 10 also rotate together with the rotating frame 1. After fixing the angle of the apparatus, a particle beam emitted from a particle accelerator (not shown) is incident on the vacuum duct 6 through a beam transport device (not shown). The particle beam incident on the vacuum duct 6 is finally deflected in a direction perpendicular to the incident direction through the deflecting electromagnets 7 and 8, and incident on the beam irradiation device 9 to form a desired irradiation field, The affected part of the patient on the bed structure 11 is irradiated. Thus, when the driving roller 4A is driven by the driving device 5, the rotating ring 3 and the rotating frame 1 rotate, and the particle beam irradiation path and the beam irradiation device 9 including the vacuum duct 6 and the deflecting electromagnets 7 and 8 also rotate. Therefore, irradiation from all angles becomes possible.

  Moreover, in the constituent elements of the particle beam irradiation path composed of the vacuum duct 6 and the deflecting electromagnets 7 and 8, magnets such as the deflecting electromagnets 7 and 8 configured to bend the moving direction of the particle beam are generally heavy. . Therefore, the counter balance 2 is attached to the rotating frame 1 so that the center of gravity is located on the rotating shaft on the opposite side to the irradiation path through which the particle beam passes. The counter balance 2 has no particular function other than the purpose of moving the center of gravity on the rotation axis.

  Next, the configuration and irradiation method of the beam irradiation apparatus 9 will be described. As an irradiation method, for example, as described in Patent Document 3, a broad beam method and a spot scanning method have been proposed. Details of the spot scanning method are described in Non-Patent Document 1. In addition to this, there are a raster scanning method and a method using a layered original. As described in Paragraph [0030] Embodiment 15 of Patent Document 3, the broad beam method uses a scatterer or wobbler electromagnet to spread the beam, and uses a collimator or bolus to move to a place other than the affected area. It is a way to reduce irradiation. Therefore, when the broad beam method is adopted, the beam irradiation device 9 needs a scatterer, a wobbler electromagnet, a collimator, and a bolus. On the other hand, as described in paragraph [0012] of Patent Document 3, in the spot scanning method, the beam irradiation apparatus uses a scanner electromagnet for irradiating a beam at an appropriate position, a dose monitor, a beam position monitor, a beam energy. It consists of a range shifter that changes Thus, the configuration of the beam irradiation apparatus varies depending on the irradiation method.

  In addition, the deflection electromagnet constituting the particle beam irradiation path composed of the vacuum duct 6 and the deflection electromagnets 7 and 8, various devices constituting the beam irradiation device (wobbler electromagnet, collimator (in the case of multi-leaf collimator), scanner) Each of the electromagnets, etc. requires power and control signals. In order to supply power to and control these devices installed inside and outside the rotating frame that rotates 360 degrees, some device is required. A cable spool performs winding and unwinding of a cable for supplying power and utility into the rotary irradiation type particle beam irradiation apparatus. For example, in Patent Document 4, a cable spool (referred to as “winding drum” in Patent Document 4) is adapted to wind a cable bear (registered trademark, cable carrier) protecting the cable spool together with the cable. A device has been proposed in which a freely rotating roller is arranged in a multi-stage cable support installed in the factory.

Japanese Patent No. 3519248 Japanese Patent No. 35999995 JP 2003-332794 A JP 2008-67908 A

“Spot scanning system for proton radiotherapy”, Tatsuaki Kanai et a1., Medical Physics, Vol.7, No.4, Jul. / Aug.1980

  By the way, when using a particle beam irradiation apparatus, or when using a particle beam therapy apparatus, the merit of increasing the choice of an irradiation form becomes a big thing.

  However, in the conventional particle beam irradiation apparatus described above, there is only one irradiation path in one rotating gantry as seen in the prior art document. Further, since there is only one beam irradiation device installed, the irradiation method is limited.

  Certainly, as described above, in the conventional particle beam irradiation system (facility), the particle beam accelerated by one particle accelerator can be guided to two rotating gantry by switching the supply path. However, most are. Of the two rotating gantry, if the beam irradiation device of one rotating gantry is a broad beam method and the beam irradiation device of the other rotating gantry is a spot scanning method, two types of irradiation methods can be implemented.

  However, in the treatment site using particle beams, the irradiation systems of the two rotating gantry are often configured identically. The reason is that the treatment plan is planned on the premise of one irradiation method, and even if one rotating gantry fails, the other one can be used as a backup immediately with the same function, and the treatment stops. Can avoid the risk of being lost. That is, it can be said that only one type of irradiation method can actually be implemented in one facility. Even if a separate beam irradiation device is mounted for each rotating gantry, it is practically impossible to perform two types of irradiation without changing the position and posture of the irradiation target.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a particle beam irradiation apparatus capable of performing two irradiations in one rotary irradiation type particle beam irradiation apparatus. To do.

  The particle beam irradiation apparatus according to the present invention is the particle beam irradiation apparatus in which the irradiation apparatus that irradiates the incident particle beam is disposed in a rotating frame that is driven to rotate about the irradiation reference point. Is configured to irradiate a part of the irradiation target by selecting the broad beam method, and irradiate the other part of the irradiation target by selecting the spot scanning method.

  The particle beam irradiation apparatus according to the present invention is configured to irradiate a part of the irradiation target by the broad beam method and irradiate the other part by the spot scanning method. Can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the particle beam irradiation apparatus concerning Embodiment 1 of this invention. It is a partial bird's-eye view which shows the particle beam irradiation apparatus concerning Embodiment 1 of this invention. It is a schematic diagram which shows the irradiation system switching means in the particle beam irradiation apparatus concerning Embodiment 2 of this invention. It is a whole bird's-eye view which shows the particle beam irradiation apparatus concerning Embodiment 3 of this invention. It is a bird's-eye view which shows each irradiation system in the particle beam irradiation apparatus concerning Embodiment 3 of this invention. It is a bird's-eye view which shows the irradiation system switching means part in the particle beam irradiation apparatus concerning Embodiment 3 of this invention. It is a whole block diagram which shows the conventional particle beam irradiation apparatus. It is the partial side view seen from the rotating shaft direction of the arrow in the VIII-VIII line which shows the conventional particle beam irradiation apparatus.

Embodiment 1 FIG.
A first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a rotating frame, 3 is a rotating ring, 4 is a support device, 4A is a driving roller, 5 is a driving device, 6 is a vacuum duct, and 10 is a cone frame. It has the function of.

  Reference numeral 14 denotes a first irradiation system of particle beams incident from the vacuum duct 6, and reference numeral 15 denotes a first irradiation device arranged in the first irradiation system 14, which irradiates the isocenter 16 at the irradiation reference position. The first irradiation system 14 is, for example, in FIG. 1, a first deflection electromagnet 17 that deflects an incident particle beam upward, and a rotary frame 1 that is positioned inside and outside the rotary frame 1. One side located inside is connected to the other side of the quadrupole electromagnet 18 connected to the first deflection electromagnet 17 and the quadrupole electromagnet 18 located outside the rotating frame 1 and passes upward through the quadrupole electromagnet 18. A second deflection electromagnet 19 for deflecting the particle beam in the horizontal direction, a four-pole electromagnet 21 supported on the outer periphery of the central portion of the rotating frame 1 by a support 20 and connected to the second deflection electromagnet 19 on one side; The third deflecting electromagnet 22 is connected to the other side of the electromagnet 21 and deflects the particle beam that has passed through the quadrupole electromagnet 21 in the horizontal direction downward and enters the first irradiation device 15.

  Reference numeral 23 denotes a second irradiation system of particle beams incident from the vacuum duct 6, and 24 denotes a second irradiation device arranged in the second irradiation system 23, which irradiates the isocenter 16. For example, in FIG. 1, the second irradiation system 23 is positioned in and out of the rotating frame 1 through the rotating frame 1 and a fourth deflecting electromagnet 25 that deflects the incident particle beam downward. One side located inside is connected to the other side of the quadrupole electromagnet 26 connected to the fourth deflection electromagnet 25 and the quadrupole electromagnet 26 located outside the rotating frame 1, and passes downward through the quadrupole electromagnet 26. A fifth deflection electromagnet 27 for deflecting the particle beam in the horizontal direction, a four-pole electromagnet 29 supported on the outer periphery of the central portion of the rotating frame 1 by a support 28 and connected to the fifth deflection electromagnet 27 on one side, and a four-pole A sixth deflecting electromagnet 30 that is connected to the other side of the electromagnet 29 and deflects the particle beam that has passed through the quadrupole electromagnet 29 in the horizontal direction upward and enters the second irradiation device 24 is configured.

  Reference numeral 31 denotes irradiation system switching means for switching the particle beam incident from the vacuum duct 6 to the first irradiation system 14 or the second irradiation system 23, and is composed of, for example, a switching electromagnet, and switching of the switching operation of the switching electromagnet Thus, the first irradiation system 14 or the second irradiation system 23 is switched to be incident, and is configured to branch into two systems.

  For example, if the first irradiation system 14 corresponds to the irradiation path of the upward particle beam in the above-described conventional rotary irradiation type particle beam irradiation apparatus, the second irradiation system 23 is the opposite side, that is, the above-described conventional system. In the rotary irradiation type particle beam irradiation apparatus, the counter balance 2 is disposed on the side.

  Various irradiation devices can be selected. For example, for the first irradiation device 15 of the first irradiation system 14, an irradiation device configuration for the broad beam system is selected and the second irradiation system 23 It is conceivable to select an irradiation device configuration for the spot scanning method for the irradiation device 24. In addition, the same irradiation device configuration may be intentionally installed, and the irradiation device may be separated and used in the upper half and the lower half, and the rotation amount of the entire device may be reduced as much as possible to reduce power costs, etc. It is also conceivable to use one irradiation system as a backup. Such a configuration is effective for a small gantry having a rotatable gantry with a rotatable range of about 180 degrees, and can also irradiate a small gantry of about 180 degrees from a direction of substantially 360 degrees. As a result, the size can be reduced.

  In the particle beam irradiation apparatus according to Embodiment 1 of the present invention, a cable spool 32 for winding the cable is provided on the incident side (left side in FIG. 1). The cable spool 32 is provided with a plurality of comb-like bodies 32a. Each of the comb-like bodies 32a can accommodate a plurality of cables 33, and the number of cables 33 that can be wound at a time is increased. Yes.

  Next, the operation will be described. Upon using the particle beam irradiation apparatus in the first embodiment of the invention, either in advance using either irradiation device, i.e., either by using the first illumination device 15 of the first illumination system 14, or the second illumination In addition to determining whether to use the second irradiation device 24 of the system 23, it is also determined from which angle the irradiation is desired. As an example, the figure illustrates a case where the first irradiation device 15 of the first irradiation system 14 is used and irradiation is performed from directly above the vertical line toward the isocenter 16 (that is, the angle described in FIG. 1).

  Then, in order to rotate the rotating frame 1 so that the particle beam can be irradiated from a desired angle, the driving device 5 is rotated by a predetermined amount by a control device (not shown), and the rotating ring 3 is rotated by the driving roller 4A. Thus, setting of a desired angular position is realized by turning the rotating frame 1 and each member constituting the particle beam irradiation path fixed to the rotating frame 1 (angle shown in FIG. 1). Next, the switching electromagnet serving as the irradiation system switching means 31 is operated and functioned so that the particle beam passes through the selected irradiation system, that is, the first irradiation system 14.

  The particle beam irradiation is performed by entering a particle beam accelerated by a particle accelerator (not shown) into a rotary irradiation type particle beam irradiation apparatus. Therefore, the particle beam accelerated by the particle accelerator is guided from the left side (referred to as the incident side) in FIG. 1 to the switching electromagnet as the irradiation system switching means 31 via the vacuum duct 6. Here, the particle beam is deflected to the selected first irradiation system 14 by the switching electromagnet (upper side in this example).

  The particle beam guided to the first irradiation system 14 is deflected upward by the first deflection electromagnet 17 and beam-adjusted by the quadrupole electromagnet 18. The particle beam passing upward through the quadrupole electromagnet 18 is deflected in the horizontal direction by the second deflecting electromagnet 19 and beam-adjusted by the quadrupole electromagnet 21. The particle beam that has passed through the quadrupole electromagnet 21 is deflected downward by the third deflecting electromagnet 22 and is incident on the first irradiation device 15. The particle beam incident on the first irradiation device 15 is irradiated from above toward the isocenter 16.

  Further, a case where the second irradiation device 24 of the second irradiation system 23 is used and irradiation from the bottom toward the isocenter 16 will be described (that is, the angle described in FIG. 1). In this case, the switching electromagnet serving as the irradiation system switching means 31 is operated and functioned so that the particle beam passes through the second irradiation system 23.

  The particle beam accelerated by the particle accelerator is introduced from the left side (referred to as the incident side) in FIG. Here, the particle beam is deflected to the selected second irradiation system 23 by the switching electromagnet (lower side in this example).

  The particle beam guided to the second irradiation system 23 is deflected downward by the fourth deflection electromagnet 25 and beam-adjusted by the quadrupole electromagnet 26. The particle beam passing downward through the quadrupole electromagnet 26 is deflected in the horizontal direction by the fifth deflecting electromagnet 27 and beam-adjusted by the quadrupole electromagnet 29. The particle beam that has passed through the quadrupole electromagnet 29 is deflected upward by the sixth deflecting electromagnet 30 and is incident on the second irradiation device 24. The particle beam incident on the second irradiation device 24 is irradiated toward the isocenter 16 from below.

  As described above, according to the first embodiment of the present invention, the two irradiation systems of the first irradiation system 14 and the second irradiation system 23 are provided in the rotating frame 1 in the particle beam irradiation apparatus. The first irradiation system 14 can be provided for a broad beam system, and the second irradiation system 23 can be provided with an irradiation system for a spot scanning system. When using a particle beam irradiation apparatus or a particle beam therapy apparatus, You can increase your options. In addition, since there are two irradiation systems in one rotating frame 1, two types of irradiation can be performed without changing the position or posture of the irradiation target, for example, the patient. More specifically, for example, it is possible to irradiate a wide range of an irradiation target by selecting the broad beam method and irradiate the vicinity of a boundary or a fine part by selecting the spot scanning method, for example, as in a coloring book. Furthermore, both the first irradiation system 14 and the second irradiation system 23 are configured by the same irradiation method, and the irradiation device is separated and used in the upper half and the lower half, thereby reducing the rotation amount of the entire device as much as possible. Reduction of power costs and the like can be achieved. Furthermore, it is conceivable to use one irradiation system as a backup.

  In addition, since the first irradiation system 14 is arranged in the upper direction and the second irradiation system 23 is arranged in the lower direction, the center of gravity of the apparatus comes on the rotation axis. There is an effect that 2 can be abolished.

  By the way, as described above, providing two systems of irradiation paths in the rotating frame 1 in the particle beam irradiation apparatus requires various devices in order to actually realize them. This means that the number of cables for supplying power and utilities in the rotary irradiation type particle beam irradiation apparatus is almost doubled. (There may be cases where power cables can be shared, but two control signal cables are required.) Therefore, a plurality of comb-like bodies 14a are provided in the cable spool 14, and a plurality of comb-like bodies 14a are provided between the comb-like bodies 14a. The cable 33 is inserted to increase the number of cables that can be wound at one time.

  As described above, in the rotating frame 1, the first deflection electromagnet 17, one side of the quadrupole electromagnet 18 and the first irradiation device 15, the fourth deflection electromagnet 25, one side of the quadrupole electromagnet 26 and the second side. Irradiating device 24, a switching electromagnet serving as irradiation system switching means 31, and the like, and a power cable, a signal cable, and a control cable are required for each. In addition, various devices such as a moving floor and an X-ray imaging device (not shown) are present in the rotating frame 1, and the power, signal, and control cables are also necessary. The total number is several hundred for one irradiation system. If it becomes two lines, it will be close to a thousand.

  Therefore, the following measures are taken for handling each cable. A device for handling the cable according to the first embodiment of the present invention will be described with reference to FIG.

  The cable spool 32 is provided with a plurality of comb-like bodies 32a, and a plurality of cables 33 can be accommodated between the comb-like bodies 32a so that the number of cables 33 that can be wound at a time is increased. Yes. When the rotating frame 1 is rotated, the cable 33 is wound and unwound by the cable spool 32.

  The cable spool 32 is provided with a cable through hole 32c in a cable intake portion 32b for taking the cable 33 from the outside to the inside corresponding to the cable 33 to be wound. As a result, the power, signal and control cables 33 can be connected to the inside of the rotating frame 1.

  Further, the second deflection electromagnet 19 mounted outside the rotating frame 1, the other side of the quadrupole electromagnet 18, the quadrupole electromagnet 21 and the third deflection electromagnet 22, and further the fifth deflection electromagnet 27 and the quadrupole electromagnet 26. For the other side, the quadrupole electromagnet 29 and the sixth deflecting electromagnet 30, as shown by the cable route 33a, the cable 33 once pulled into the cable spool 32 is passed through the window 1a provided in the rotating frame 1. Just go outside.

  In general, a cable bearer is used at a location where the cable can move, thereby protecting the cable from being rubbed or broken (Patent Document 4). On the other hand, the cable bear takes up space. Therefore, it is only necessary to determine whether or not to use a cable track in consideration of the balance between cable protection and the number of windings.

  Since the number of cables 33 required for the particle beam irradiation apparatus according to the first embodiment is several hundred or more, the influence of the weight of the cables 33 must be taken into consideration. According to the first embodiment of the present invention, the right-handed cable group and the left-handed cable group are divided to cancel the rotational moment applied to the cable spool 32 by the weight of the cable 33. To make the figure easier to understand, the right-handed cable group and the left-handed cable group are separated in the front and rear in the direction of the rotation axis, but the same effect can be achieved if the right-handed and left-handed groups are set finely or arranged alternately. Play. The essence here is to cancel the rotational moment of the cable spool 32 by the cable 33. A support 32d is provided in the cable spool 32 to reinforce the influence of the weight of the cable 33.

Embodiment 2. FIG.
In the first embodiment of the present invention described above, a case where a switching electromagnet is used as the irradiation system switching means 31 for switching the particle beam incident through the vacuum duct 6 to the first irradiation system 14 or the second irradiation system 23 will be described. However, as shown in FIG. 3, the first switching deflection electromagnet 34 that deflects the particle beam incident through the vacuum duct 6 to the first irradiation system 14 and the particle beam incident through the vacuum duct 6 are second irradiated. Irradiation system from a second switching deflection electromagnet 35 deflected to the system 23 and a rectilinear incident body 36 that causes the particle beam incident through the vacuum duct 6 to enter the second switching deflection magnet 35 through the first switching deflection magnet 34 The switching means 31 may be configured.

  Usually, since the particle beam irradiation method from above is often selected, the second switching deflection electromagnet 35 is turned off and the first switching deflection electromagnet 34 is turned on. The particle beam incident through the vacuum duct 6 is deflected to the first irradiation system 14 by the first switching deflection electromagnet 34. Therefore, the second switching deflection electromagnet 35 is in an OFF state, and no particle beam is incident on the second irradiation system 23. When it is desired to make the particle beam incident on the second irradiation system 23, the first switching deflection electromagnet 34 is turned off and the second switching deflection electromagnet 35 is turned on. The particle beam incident through the vacuum duct 6 is deflected to the second irradiation system 23 by the second switching deflection electromagnet 35 through the rectilinear incident body 36. Therefore, the first switching deflection electromagnet 35 is in the OFF state, and no particle beam is incident on the first irradiation system 14. As is apparent from the above, the first switching deflection electromagnet 34 and the second switching deflection electromagnet 35 constituting the irradiation system switching means 31 are the same as those of the first deflection electromagnet 17 and the third switching electromagnet 17 in the first embodiment of the invention described above. The function of the deflection electromagnet 25 is provided. Therefore, the first deflection electromagnet 17 and the third deflection electromagnet 25 can be omitted, the structure can be simplified and the cost can be reduced.

Embodiment 3 FIG.
Moreover, in Embodiment 1 and 2 of this invention mentioned above, it irradiated toward the isocenter 16 from the 1st irradiation apparatus 15 of the 1st irradiation system 14, or the 2nd irradiation apparatus 24 of the 2nd irradiation system 23. In general, the particle beam is generally used so as to disappear inside an irradiation target (not shown) arranged in the isocenter 16. However, if the irradiation directions of the first irradiation device 15 and the second irradiation device 24 face each other, the particle beam irradiated from one irradiation device may be exposed to the other irradiation device, particularly by neutrons. Risk arises.

  Therefore, the third embodiment of the present invention is arranged so that the irradiation directions of the first irradiation device 15 and the second irradiation device 24 do not face each other. A third embodiment of the present invention will be described with reference to FIGS. 4 is a bird's-eye view showing the whole irradiation system, FIG. 5 is a bird's-eye view showing each irradiation system, and FIG. 6 is a bird's-eye view showing the irradiation system switching means. As is clear from these figures, the particle beam irradiated from the first irradiation device 15 on the first irradiation system 14 side toward the isocenter 16 is irradiated on the second irradiation device 24 on the second irradiation system 23 side. In addition, the particle beam irradiated from the second irradiation device 24 on the second irradiation system 23 side toward the isocenter 16 is not irradiated on the first irradiation device 15 on the first irradiation system 14 side. The irradiation direction of each irradiation device is arranged so as not to be the same orbit of the particle beam. That is, the second irradiation device 24 is not positioned at 180 degrees opposite to the first irradiation device 15, but is arranged so that the left side is smaller than 180 degrees when viewed from the side of the rotating frame 1, for example. ing.

  In the third embodiment, the second embodiment described above will be mainly described. That is, the irradiation system switching means 31 includes a first switching deflection electromagnet 34, a second switching deflection electromagnet 35, and a rectilinear incident body 36. However, the present invention is not limited to this, and the irradiation system switching means 31 is configured by a switching electromagnet as in the first embodiment described above. The present invention can also be applied to a particle beam irradiation apparatus and has the same effect.

  As described above, the particle beam irradiated from the first irradiation device 15 is not irradiated to the second irradiation device 24, and conversely, the particle beam irradiated from the second irradiation device 24 is the first irradiation beam. Since one irradiation device 15 is not irradiated, there is no risk that the particle beam irradiated from one irradiation device may be exposed to the other irradiation device, in particular, by neutrons. Can be obtained.

  The present invention is suitable for realizing a particle beam irradiation apparatus that irradiates particle beams such as carbon ions and protons for research and cancer treatment.

DESCRIPTION OF SYMBOLS 14 1st irradiation system 15 1st irradiation apparatus 23 2nd irradiation system 24 2nd irradiation apparatus 31 Irradiation system switching means 34 1st switching deflection electromagnet 35 2nd switching deflection electromagnet

Claims (3)

In a particle beam irradiation apparatus disposed in a rotating frame in which an irradiation apparatus that irradiates an incident particle beam is rotatably driven with an irradiation reference point as a rotation center,
The irradiation apparatus is configured to irradiate a part of an irradiation target by selecting a broad beam method and to irradiate another part of the irradiation target by selecting a spot scanning method.   2. The particle beam irradiation apparatus according to claim 1, wherein the other part of the irradiation target to be irradiated by selecting the spot scanning method includes the vicinity of the boundary.   The particle beam therapy system according to claim 1, wherein the irradiation is performed by a broad beam method and a spot scanning method without changing the position and posture of the irradiation target.

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