WO2016113906A1 - Appareil d'irradiation de rayonnement - Google Patents

Appareil d'irradiation de rayonnement Download PDF

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Publication number
WO2016113906A1
WO2016113906A1 PCT/JP2015/051080 JP2015051080W WO2016113906A1 WO 2016113906 A1 WO2016113906 A1 WO 2016113906A1 JP 2015051080 W JP2015051080 W JP 2015051080W WO 2016113906 A1 WO2016113906 A1 WO 2016113906A1
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Prior art keywords
radiation
liquid
container
pipe
radiation irradiation
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PCT/JP2015/051080
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English (en)
Japanese (ja)
Inventor
宮本　明啓
山下　一郎
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三菱重工業株式会社
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Priority to PCT/JP2015/051080 priority Critical patent/WO2016113906A1/fr
Publication of WO2016113906A1 publication Critical patent/WO2016113906A1/fr

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K5/00—Irradiation devices

Definitions

  • the present invention relates to a radiation irradiation apparatus.
  • One method of treating cancer is radiation therapy.
  • therapeutic radiation electron beam, X-ray, proton beam, heavy particle beam, gamma ray, neutron beam, etc.
  • Treatment is performed by irradiating only cancer cells with a lethal dose of radiation.
  • X-rays are generated by accelerating electrons with an electron beam accelerator (linac) and colliding the accelerated electron beam with an X-ray target.
  • the generated X-ray is defined as a therapeutic X-ray having a predetermined irradiation field size by limiting the irradiation field with a collimator.
  • the air dose distribution of the therapeutic X-ray is required to be uniform (flat) in the irradiation field.
  • X-rays generated when an electron beam collides with an X-ray target has directivity in the forward direction with respect to the electron beam acceleration direction, and the dose in the center of the irradiation field becomes high. Therefore, a method has been used for a long time to flatten the air dose distribution by installing a conical metal part called a flattening filter behind the X-ray target and attenuating the X-ray according to the path length through which the flattening filter passes. ing.
  • the device configuration without a flattening filter is used to shorten the treatment time and increase the medical dose due to the high dose rate.
  • Such an operation mode is called flattening filter free.
  • the electron beam treatment which irradiates a patient with an electron beam without converting into an X-ray is also performed.
  • a substance called a scattering foil is arranged, and the patient is irradiated after scattering the electron beam.
  • a device that switches operation modes in the same device by mechanically moving a substrate on which a plurality of flattening filters or scattering foils are installed.
  • a radiation irradiation device that goes around the affected part around the affected part with a travel drive device irradiates the affected part from various directions toward the affected part.
  • a travel drive device In order to circulate around, there is a problem that the apparatus becomes large.
  • the deviation of the dose reproducibility due to the deviation of the positioning reproducibility due to the mechanical drive may affect the quality assurance of the irradiation performance.
  • the present invention has been made in view of the above circumstances, and intends to achieve the following object. 1. It is possible to switch between using a flattening filter with a flat dose distribution as an operation mode and flattening filter free. 2. To reduce the size of the device. 3. To improve positioning reproducibility by machine drive.
  • the radiation irradiation apparatus of the present invention comprises a radiation source, A filter for attenuating radiation emitted from the radiation source, A container capable of containing a liquid that attenuates radiation therein;
  • the above-mentioned problem has been solved by providing switching means capable of taking liquid into and out of the container.
  • the container is formed in a weight shape having the radiation source side as a vertex.
  • the switching unit may include a liquid supply unit that supplies and discharges liquid into the container, and a gas discharge unit that discharges and supplies gas into the container. .
  • the container has a plurality of rooms partitioned inside, and the switching means can allow liquid to be taken in and out of each room.
  • the plurality of rooms may be concentrically partitioned around a radiation irradiation axis inside the container.
  • a collimator may be provided around the radiation irradiation axis of the filter, and a pipe in the switching unit may penetrate the collimator, and the pipe may be bent in the collimator.
  • the radiation irradiation apparatus of the present invention includes a radiation source and a filter for attenuating radiation emitted from the radiation source, and the filter contains a container capable of containing a liquid for attenuating radiation inside the container.
  • a switching means that allows liquid to be taken in and out, it is possible to switch the presence or absence of a flattening filter by filling and discharging the liquid in the container, and flattening filter free by simply taking in and out the liquid Can be provided.
  • the container is formed in a weight shape with the radiation source side as the apex, so that the radiation passes through the liquid thickness along the container shape by the liquid filled in the container. Therefore, the X-rays generated by the collision of the electron beam with the X-ray target have directivity in the forward direction with respect to the electron beam acceleration direction, and the flattening in which the dose at the center of the irradiation field is increased is made uniform. It can exhibit a function as a filter.
  • the liquid with which the container is filled can be a substance that has an ability to attenuate radiation to be irradiated, such as mercury or water.
  • the switching unit includes a liquid supply unit that supplies and discharges liquid into the container, and a gas discharge unit that discharges and supplies gas into the container.
  • the liquid supply means supplies the liquid into the container
  • the gas discharge means discharges the gas into the container so that the container is filled with the liquid and functions as a flattening filter.
  • the container has a plurality of rooms partitioned inside, and the switching means can allow liquid to be taken in and out of each room, thereby switching the presence or absence of liquid in the plurality of rooms. Since the liquid passage distance in the radiation irradiation direction can be selected and switched from a plurality of states, the function is equivalent to that provided with a large number of conical flattening filters as described in Patent Document 1. It is possible to have
  • a plurality of flattening filters made of conical solids having different heights are provided by concentrically partitioning the plurality of chambers around the radiation irradiation axis inside the container. It is possible to switch whether or not the radiation is attenuated from the central portion of the radiation irradiation axis to the periphery of the irradiation field concentrically.
  • a collimator is provided around the radiation irradiation axis of the filter, and the pipe in the switching unit penetrates the collimator, and the pipe is bent in the collimator, whereby radiation propagates in the pipe. It is possible to prevent leakage to the outside of the collimator, and to achieve both a radiation shielding function as a collimator and a function of supplying / discharging liquid or gas to / from the flattening filter container.
  • the present invention it is possible to switch between using a flattening filter having a flat dose distribution as an operation mode and flattening filter-free, reducing the size of the apparatus, and improving positioning reproducibility by mechanical drive. It is possible to achieve the effect of being able to.
  • FIG. 1 is a perspective view showing a radiotherapy apparatus having a radiation irradiation apparatus in the present embodiment
  • FIG. 2 is a front sectional view showing the vicinity of a flattening filter in the present embodiment
  • FIG. FIG. 1 is a schematic front sectional view showing a flattening filter in FIG. 1.
  • reference numeral 1 denotes a radiation therapy system.
  • a radiation therapy apparatus 1 having a radiation irradiation apparatus includes a turning drive device 11, an O-ring 12, a traveling gantry 13, and a swing mechanism (Gimbal mechanism) 14. And 10 A of irradiation parts, sensor arrays 15a, 15b, and 15c, and the couch 16 are comprised.
  • the irradiation unit 10 ⁇ / b> A includes a radiation irradiation device 20, a multi-leaf collimator (MLC) 17, imaging radiation sources 18 a and 18 b, and an infrared (IR) camera 19.
  • MLC multi-leaf collimator
  • IR infrared
  • the turning drive device 11 supports an O-ring 12 on a base so as to be rotatable about a rotation axis A11, and rotates the O-ring 12 according to control of a radiotherapy device control device (not shown).
  • the rotation axis A11 is a vertical axis.
  • the O-ring 12 is formed in a ring shape centered on the rotation axis A12, and supports the traveling gantry 13 so as to be rotatable about the rotation axis A12.
  • the rotation axis A ⁇ b> 12 is an axis in the longitudinal direction of the couch 16.
  • the rotation axis A12 is a horizontal axis (that is, an axis perpendicular to the vertical direction), and is orthogonal to the rotation axis A11 at the isocenter P11.
  • the rotation axis A12 is fixed with respect to the O-ring 12. That is, the rotation axis A12 rotates around the rotation axis A11 as the O-ring 312 rotates.
  • the traveling gantry 13 is formed in a ring shape centered on the rotation axis A ⁇ b> 12, and is disposed inside the O ring 12 so as to be concentric with the O ring 12.
  • the radiotherapy apparatus 1 further includes a travel drive device (not shown), and the travel gantry 13 rotates about the rotation axis A12 with power from a travel drive device (not shown).
  • the traveling gantry 13 integrally rotates components such as the imaging radiation source 18a and the sensor array 15b, the imaging radiation source 18b, and the sensor array 15c.
  • the swing mechanism 14 is fixed to the inside of the ring of the traveling gantry 13 and supports the irradiation unit 10 ⁇ / b> A on the traveling gantry 13.
  • the head swing mechanism 14 supports the irradiation unit 10A so that the direction of the irradiation unit 10A can be changed, and changes the direction of the irradiation unit 10A according to control of a radiotherapy apparatus control device (not shown).
  • the swing mechanism 14 rotates the irradiation unit 10A around a pan axis A21 parallel to the rotation axis A12.
  • the swing mechanism 14 rotates the irradiation unit 10A around a tilt axis A22 orthogonal to the pan axis A21.
  • the irradiation unit 10 ⁇ / b> A is disposed inside the traveling gantry 13 and supported by the swing mechanism 14, and irradiates therapeutic radiation and imaging radiation.
  • the multi-leaf collimator 17 shields part or all of the therapeutic radiation B11 by opening and closing the leaf according to the control of the radiation therapy apparatus control device. Thereby, the multi-leaf collimator 17 adjusts the shape of the irradiation field when the therapeutic radiation B11 is irradiated to the patient T11.
  • the imaging radiation source 18a irradiates imaging radiation (X-rays) toward the sensor array 15b in accordance with the control of the radiation therapy apparatus control device.
  • the imaging radiation source 18b irradiates imaging radiation toward the sensor array 15c under the control of the radiation therapy apparatus control device.
  • the imaging radiation sources 18a and 18b are fixed to the irradiation unit 10A (for example, the housing of the multi-leaf collimator 17) in a direction in which the irradiated radiation is orthogonal.
  • the sensor array 15 a is arranged at a position where the therapeutic radiation from the radiation irradiation device 20 strikes and faces the radiation irradiation device 20, and is fixed inside the ring of the traveling gantry 13. Yes.
  • the sensor array 15a receives the therapeutic radiation transmitted through the patient T11 and the like for confirmation of the irradiation position and recording of treatment. In addition, light reception here is receiving radiation.
  • the sensor array 15 b is disposed at a position where the imaging radiation from the imaging radiation source 18 a strikes and faces the imaging radiation source 18 a, and is fixed inside the ring of the traveling gantry 13.
  • the sensor array 15b receives imaging radiation irradiated from the imaging radiation source 18a and transmitted through the patient T11 and the like for specifying the affected part position.
  • the sensor array 15 c is arranged at a position where the imaging radiation from the imaging radiation source 18 b is hit, facing the imaging radiation source 18 b, and is fixed inside the ring of the traveling gantry 13.
  • the sensor array 15c receives the imaging radiation irradiated from the imaging radiation source 18b and transmitted through the patient T11 and the like for specifying the affected part position.
  • the sensor arrays 15a and 15b receive imaging radiation from the imaging radiation sources 18a and 18b, whereby a radiation image is obtained.
  • the couch 16 is used for the patient T11 to lie down and supports the patient T11.
  • the couch 16 is installed such that the longitudinal direction thereof faces the direction of the rotation axis A12.
  • the couch 16 can be moved in various directions with the longitudinal direction thereof directed toward the rotation axis A12.
  • the infrared (IR) camera 19 receives infrared rays and takes an infrared image.
  • the infrared camera 19 is installed toward a patient T11 lying on the couch 16, as shown in FIG.
  • the infrared camera 19 images the infrared marker provided in the body surface near the affected part of patient T11, and acquires the positional information on the said infrared marker in real time.
  • the infrared camera 19 acquires position information of the infrared marker at the time in association with the time information.
  • the radiation irradiation apparatus 20 irradiates therapeutic radiation toward the affected part of the patient T11 in accordance with control of a radiotherapy apparatus control apparatus (not shown).
  • a radiotherapy apparatus control apparatus not shown.
  • the radiation irradiation apparatus 20 is supported by the traveling gantry 13 via the swing mechanism 14, the radiation irradiation apparatus 20 is once directed to the isocenter P11 by adjusting the swing mechanism 14. Even if the O-ring 12 is rotated by the turning drive device 11 or the traveling gantry 13 is rotated by the traveling drive device, the therapeutic radiation B11 always passes through the isocenter P11. Therefore, the radiation irradiation apparatus 20 can irradiate the therapeutic radiation B11 from various directions toward the isocenter P11 by rotating around the rotation axis A11 or the rotation axis A12.
  • the radiation irradiation apparatus 20 includes an electron beam accelerator 21, an X-ray target (target) 22, a flattening filter 30, and a collimator 24 as a radiation source.
  • the electron beam accelerator 21 has a vacuum window in which an electron beam from an electron beam generation source (not shown) is changed in direction by a bending magnet and allows the electron beam to pass while maintaining a vacuum. Is converted to X-rays.
  • a collimator 24 for narrowing down the electron beam and the X-ray from the target 22, and a flattening filter 30 for making the dose distribution of the electron beam and the X-ray uniform on the irradiation surface. Be placed.
  • the flattening filter 30 includes a conical hollow container 31 having the radiation source side at the top, a thin pipe 32 for injecting liquid into the container, and a thin pipe 33 for injecting gas.
  • a liquid supply source 34 capable of supplying and discharging a liquid that attenuates radiation is connected to the pipe 32, and these constitute a liquid supply means 32A.
  • the liquid supply source 34 has pressurizing means such as a pump (not shown), and is capable of pressurizing and discharging liquid. As the liquid filled in the liquid supply source 34, mercury, oil, water or the like can be applied.
  • the pipe 33 is connected with a gas discharge source 35 capable of discharging and supplying an internal gas when supplying liquid to the container 31, and constitutes a gas discharge means 33 ⁇ / b> A.
  • the gas supply source 35 has pressurizing means such as a pump (not shown) and is capable of pressurizing and discharging gas.
  • pressurizing means such as a pump (not shown) and is capable of pressurizing and discharging gas.
  • air or atmospheric pressure gas such as nitrogen is applicable.
  • the pipe 33 penetrates the inside of the collimator 24 and has a bent portion 33 k inside the collimator 24, so that radiation is not irradiated to the outside of the collimator 24 through the pipe 33. It is like that.
  • a similar bent portion 32k can be provided.
  • the bent portion 33k only needs to be formed in the contents by irradiating the outside of the collimator 24 with radiation through the inside of the tube, and is preferably bent at least once, preferably twice or more.
  • the pipe 33 has a pipe diameter set so that radiation is shielded in the vicinity of the bent portion 33 k inside the collimator 24.
  • the pipe diameter of the pipe 32 is also selected as the content that hinders the supply and discharge of gas and liquid.
  • the container 31 and the collimator 24 are disposed at a position that is coaxial with the axis of the electron beam emitted from the electron beam accelerator 21.
  • a pipe 32 of liquid supply means 32A is connected to the container 31 at the bottom 31a side, and a pipe 33 of gas supply means 33A is connected to the top 31b side.
  • the shape of the container 31 is such that the liquid height is set so that the air dose distribution is flattened by the X-ray shielding of the filled liquid when irradiation is performed with the liquid filled. Further, the height of the container 31 is set high at the irradiation center, and the height of the container 31 is set low toward the periphery. Therefore, when the air dose distribution in the container 31 not filled with the liquid is in the state shown in FIG. 3A, the air dose distribution in the container 31 filled with the liquid is shown in FIG. It will be in the state flattened.
  • the liquid supply means 32A and the gas supply means 33A constitute switching means for switching the mode of the flattening filter, and control the amount of liquid supplied into the container 31 and the amount of gas discharged from the container 31 in conjunction with each other. It is possible. At the same time, the amount of liquid discharged from the container 31 and the amount of gas supplied to the container 31 can be controlled in conjunction with each other.
  • the piping 32 and the piping 33 are provided with scales 32d and 33d, respectively, and this portion is a transparent piping so that the liquid located inside thereof can be visually recognized.
  • liquid is applied to the flattening filter 30 positioned at the irradiation position so as to match the energy of the X-rays converted by the target 22.
  • the gas in the container 31 is discharged to the gas discharge means 33A.
  • the gas is discharged from the gas discharge side pipe 33 and, at the same time, the liquid is filled into the container 31 of the flattening filter 30 from the liquid injection side pipe 32.
  • the flattening filter 30 located at the irradiation position is matched with the energy of the X-rays converted by the target 22. Then, gas is supplied from the gas discharge means 33A to the container 31, and the liquid in the container 31 is discharged to the liquid supply means 32A. Thereby, the gas is filled into the container 31 of the flattening filter 30 from the gas supply side pipe 33, and at the same time, the liquid is discharged from the liquid discharge side pipe 32.
  • irradiation is performed in the flattening filter free mode by performing irradiation with the liquid in the container 31 of the flattening filter 30 being emptied.
  • the dose rate can be improved even with the same accelerator output.
  • the flattening filter When the gas is supplied to the container 31 in the flattening filter 30, the flattening filter is in a state in which the irradiation dose is higher than that in the case where the same accelerator output is made uniform without uniformizing the air dose. Irradiation in free mode can be made possible.
  • the container 31 itself of the flattening filter 30 serves as a filter plate, and the absorbed dose to the patient's skin can be reduced by removing the low energy X-ray component.
  • the flattening filter free mode and the flattening state of the air dose by the flattening filter 30 can be switched only by taking in and out of the liquid, a plurality of flattening filters are provided in advance.
  • the radiation irradiation apparatus 20 can be miniaturized, and the radiation irradiation apparatus 20 can be adapted to an apparatus in which the radiation irradiation apparatus 20 turns around the patient P11 to be irradiated like the radiation treatment apparatus 1. Therefore, the positioning reproducibility by mechanical drive can be improved.
  • the position of the liquid while visually confirming the boundary position between the liquid and the gas from the outside of the pipe 33 in the vicinity of the scales 32d and 33d provided on the pipes 32 and 33 that are transparent pipes.
  • the presence / absence of liquid inside the container 31 can be confirmed, and the mode of the flattening filter 30 can be confirmed.
  • the pipes 32 and 33 with the bent portions 32k and 33k within the collimator 24 and setting the pipe diameter radiation leakage from the pipes 33 and 32 can be reduced inside the collimator 24.
  • the pipe 33 of the gas discharge means 33A is arranged so as to be connected to the top portion 31b side of the container 31, but instead of this, as shown in FIG.
  • An inner inclined surface 33g parallel to the side surface portion 31c is provided inside 31c, and a space parallel to the side surface portion 31c is formed by the inner inclined surface 33g, and a space inside the side surface portion 31c is formed outside the inner inclined surface 33g.
  • the container 31 is divided by the entire length in the height direction, and an opening 33f is provided at the top position of the inner slope 33g, so that the pipe 33 can be connected to the bottom 31a that is outside the inner slope 33g.
  • the outer space of the inner slope 33g becomes an extension of the pipe 33, and it is possible to reduce the influence of radiation irradiated by the pipe 33.
  • the top 31b of the container 31 is the portion with the strongest radiation dose, it is preferable that the influence on the dose distribution is reduced by not having the pipe 33 positioned in this portion.
  • the opening 33f is located at the top of the inner slope 33g, it is possible to suitably discharge the gas from the inside of the container 31 through the opening 33f, and reliably discharge the gas in the inner space of the inner slope 33g. It becomes easy to fill the liquid, and it becomes possible to reliably shield the dose set in the initial stage.
  • the pipe 33 can be arranged without penetrating the collimator 24.
  • FIG. 7 is a schematic diagram showing the flattening filter 30 in the present embodiment.
  • the present embodiment is different from the first embodiment described above in respect of the liquid supply means 32A and the gas discharge means 33A, and other corresponding components are denoted by the same reference numerals and description thereof is omitted. .
  • a pipe 32a and a pipe 32b are connected to the container 31, and the pipe 32a and the pipe 32b are connected to valves 34a and 334b and a pump. It is connected to the liquid supply source 34 via 34d.
  • a pipe 32a on the liquid discharge side is connected near the bottom 31a of the container 31, and a pipe 32b on the liquid supply side is connected on the top 31b side of the container 31.
  • the valves 34a and 34b are opened, and the pump 34d is operated to supply the liquid from the pipe 32b.
  • the valves 34a and 34b are opened. The liquid is discharged from the pipe 32a by operating the pump 34d.
  • a pipe 33a and a pipe 33b are connected to the container 31, and the pipe 33a and the pipe 33b are connected to a gas discharge source 35 through valves 35a and 35b and a pump 35d.
  • a pipe 33a on the gas discharge side is connected to the vicinity of the top 31b of the container 31, and a pipe 33b on the gas supply side is connected to the lower part 31a side of the container 31.
  • the valves 35a and 35b are opened when the gas is supplied, and the pump 35d is operated to supply the gas from the pipe 33b, and the valves 35a and 35b are opened when the gas is discharged. By operating the pump 35d, the liquid is discharged from the pipe 33a.
  • the liquid supply means 32A and the gas discharge means 33A perform the supply of the liquid to the container 31 and the discharge of the gas in conjunction with the first embodiment, and the discharge of the liquid from the container 31 and the supply of the gas. It is supposed to be done.
  • the radiation irradiation apparatus 20 of the present embodiment it is possible to achieve the same effects as those of the first embodiment described above, and it is possible to easily supply and discharge liquid and gas to and from the container 31. It becomes. Further, by appropriately switching the valves 34a, 34b, 35a, 35b, as shown in FIG. 1, the radiation irradiation device 20 rotates around the patient P11 to be irradiated, and the top 31b of the container 31 is moved from the bottom 31a. However, even when the liquid is located on the lower side, it is possible to easily switch between the liquid filling uniform mode and the flattening filter free mode by filling and discharging the liquid and gas without any trouble.
  • FIG. 8 is a schematic diagram showing the flattening filter 30 of the radiation irradiation apparatus 20 in the present embodiment. This embodiment is different from the first and second embodiments described above with respect to the container 31, and other corresponding components are denoted by the same reference numerals and description thereof is omitted.
  • the interior of the container 31 is configured to have a room divided into a plurality of sections.
  • the side surface forming the outer slope of the container 31 in the container 31.
  • An inner side surface portion 31f is erected over the entire height of the container 31 inside the portion 31c.
  • the inner side surface portion 31f has a conical shape and forms an inner room 31A together with the central portion of the bottom portion 31a, and the inner side surface portion 31f forms a space serving as an outer room 31B with the side surface portion 31c.
  • the pipe 32a is connected to the bottom 31a which is the inner side of the inner side surface part 31f, and the pipe 33a is connected to the top part 31b side of the inner side surface part 31f.
  • the pipe 32a is connected to the liquid supply source 34 via the valve 34a as the liquid supply means 32A, and the pipe 33a is connected to the gas discharge source 35 via the valve 35a as the gas discharge means 33A to the inner room 31A. Liquid supply / gas discharge and liquid discharge / gas supply are possible.
  • a pipe 32b is connected to the bottom 31a that is outside the inner side surface 31f, and a pipe 33b is connected to the top 31b side of the side 31c that is outside the inner side 31f.
  • the pipe 32b is connected to the liquid supply source 34 via the valve 34b as the liquid supply means 32A, and the pipe 33b is connected to the gas discharge source 35 via the valve 35b as the gas discharge means 33A to the outer room 31B. Liquid supply / gas discharge and liquid discharge / gas supply are possible.
  • the liquid supply means 32A and the gas discharge means 33A By operating the liquid supply means 32A and the gas discharge means 33A with the valve 34a and the valve 35a opened, the liquid supply / gas discharge and liquid discharge to the inner room 31A in the inner room 31A that is the inner space of the inner side surface portion 31f. ⁇ Gas supply is possible. Further, by operating the liquid supply means 32A and the gas discharge means 33A with the valve 34b and the valve 35b open, in the outer room 31B that is the outer space of the inner side surface portion 31f, the liquid supply / gas discharge to the outer room 31B and Liquid discharge and gas supply are possible.
  • the outer room 31B which is the outer space of the inner side surface portion 31f
  • the inner room 31A which is the inner space of the inner side surface portion 31f
  • the radiation dose can be reduced only in this portion.
  • the radiation irradiation apparatus 20 of the present embodiment can achieve the same effects as those of the first and second embodiments described above, and further, only the inner room 31A of the container 31 and the inner room 31A and the outer By supplying and discharging liquid and gas to and from the room 31B, the flattened state can be easily switched.
  • the valves 34a, 34b, 35a, and 35b as appropriate to operate the liquid supply means 32A and the gas discharge means 33A, the maximum uniformization mode in which the liquid is filled in the inner room 31A and the outer room 31B, and only the inner room 31A. It is possible to easily switch between the small uniform mode in which the liquid is filled and the flattening filter free mode in which the liquid is not filled.
  • FIG. 9 is a schematic diagram showing the flattening filter 30 of the radiation irradiation apparatus 20 in the present embodiment.
  • This embodiment is different from the above-described third embodiment in the point relating to the pipe 33, and the corresponding constituent elements other than this are denoted by the same reference numerals and description thereof is omitted.
  • an inner pipe 33m is provided inside the inner room 31A, and an inner pipe 33n is provided inside the outer room 31B.
  • the inner pipe 33m extends to the vicinity of the top part 31b along the inner side of the inner side surface part 31f, and is connected to the pipe 33a provided on the bottom part 31a which is the inner side of the inner side part 31f.
  • the inner pipe 33n extends along the inner side of the side part 31c to the vicinity of the top part 31b, and is connected to a pipe 33b provided on the bottom part 31a that is outside the inner side part 31f and inside the side part 31c.
  • the same effects as those of the third embodiment described above can be obtained, and the end openings of the inner pipes 33m and 33n are near the tops of the inner side surface portion 31f and the side surface portion 31c. Therefore, it is possible to suitably discharge gas from the inner room 31A and the outer room 31B from the inner pipes 33m and 33n, and reliably discharge gas in each of the inner room 31A and the outer room 31B. In addition, it becomes easy to fill the liquid, and it becomes possible to reliably shield the dose set in the initial stage. At the same time, the pipe 33 can be arranged without penetrating the collimator 24.
  • FIG. 10 is a schematic diagram showing the flattening filter 30 of the radiation irradiation apparatus 20 in the present embodiment.
  • This embodiment is different from the above-described fourth embodiment in respect of the pipe 33, and the other corresponding components are denoted by the same reference numerals and description thereof is omitted.
  • an inner pipe 33p communicating with the inside of the inner room 31A is provided as a double pipe at the center of the container 31, and an inner pipe 33q communicating with the inside of the outer room 31B is provided.
  • the inner pipe 33p is located outside the double pipe erected at the center of the container 31, extends to the vicinity of the top part 31b, and is provided on the bottom part 31a on the inner side of the inner side part 31f. Is connected.
  • the inner pipe 33q is positioned inside the double pipe erected at the center of the container 31, extends to the vicinity of the top 31b and penetrates the inner side surface 31f, and on the outer side of the inner side surface 31f.
  • the piping 33b provided in the bottom part 31a used as the inner side of the side part 31c is connected.
  • a pipe line is connected to the valve 34a side through the valve 35p on the pipe 33b side from the valve 35b, and a valve 34q is provided on the pipe 32a side from the valve 34a to supply liquid into the inner pipe 33q.
  • a valve 34q is provided on the pipe 32a side from the valve 34a to supply liquid into the inner pipe 33q.
  • the same effects as those of the fourth embodiment described above can be obtained, and the end openings of the inner pipes 33p and 33q are near the tops of the inner side surface portion 31f and the side surface portion 31c. Therefore, it is possible to suitably discharge gas from the inner room 31A and the outer room 31B from the inner pipes 33p and 33q, and reliably discharge gas in each of the inner room 31A and the outer room 31B. In addition, it becomes easy to fill the liquid, and it becomes possible to reliably shield the dose set in the initial stage. At the same time, the pipe 33 can be arranged without penetrating the collimator 24.
  • FIG. 11 is a schematic diagram showing the flattening filter 30 of the radiation irradiation apparatus 20 in the present embodiment.
  • This embodiment is different from the first to fifth embodiments described above with respect to the number of sections of the container 31, and other corresponding components are denoted by the same reference numerals and description thereof is omitted.
  • the interior of the container 31 is configured to have a room divided into a plurality of sections, and specifically, as shown in FIG. 11, the side surface forming the outer slope of the container 31 in the container 31.
  • An inner side surface portion 31s is erected on the inner side of the portion 31c and is lower than the overall height of the container 31, and an inner side surface portion 31f is erected on the inner side of the inner side surface portion 31s and lower than the overall height of the inner side surface portion 31s.
  • the inner side surface portion 31s has a conical shape, and forms a middle chamber 31C together with the outer surface of the inner side surface portion 31f and the bottom portion 31a outside the inner side surface portion 31f and inside the inner side surface portion 31s. ing.
  • the inner side surface portion 31f forms an inner room 31A together with the central portion of the bottom portion 31a.
  • a space serving as an outer room 31B is formed between the inner side surface portion 31s, the side surface portion 31c, and the bottom portion 31a that is outside the inner side surface portion 31s.
  • an inner pipe 33m is provided inside the inner room 31A.
  • the inner piping 33m extends to the vicinity of the top portion 31b side along the inner side of the inner side surface portion 31f, and is connected to the piping 33a provided on the bottom portion 31a on the inner side of the inner side surface portion 31f.
  • the pipe 32a is connected to the liquid supply source 34 via the valve 34a as the liquid supply means 32A, and the pipe 33a is connected to the gas discharge source 35 via the valve 35a as the gas discharge means 33A to the inner room 31A. Liquid supply / gas discharge and liquid discharge / gas supply are possible.
  • an inner pipe 33s is provided inside the middle room 31C, and a pipe 32c is connected to a bottom part 31a that is inside the middle side surface part 31s.
  • the inner pipe 33s extends to the vicinity of the top part 31b side along the inner side of the middle side surface part 31s, and is connected to a pipe 33c provided on the bottom part 31a on the inner side of the middle side part 31s.
  • the pipe 33c is connected to the liquid supply source 34 via the valve 34c as the liquid supply means 32A, and the pipe 33c is connected to the gas discharge source 35 via the valve 35c as the gas discharge means 33A to the middle chamber 31C. Liquid supply / gas discharge and liquid discharge / gas supply are possible.
  • an inner pipe 33n is provided inside the outer room 31B.
  • the inner pipe 33n extends along the inner side of the side part 31c to the vicinity of the top part 31b, and is connected to a pipe 33b provided on the bottom part 31a which is outside the inner side part 31s and inside the side part 31c.
  • the pipe 32b is connected to the liquid supply source 34 via the valve 34b as the liquid supply means 32A, and the pipe 33b is connected to the gas discharge source 35 via the valve 35b as the gas discharge means 33A to the outer room 31B. Liquid supply / gas discharge and liquid discharge / gas supply are possible.
  • the liquid supply means 32A and the gas discharge means 33A By operating the liquid supply means 32A and the gas discharge means 33A with the valve 34c and the valve 35c opened, the liquid to the middle room 31C is obtained in the middle room 31C which is the outer space of the inner side face 31f inside the middle side face 31s.
  • Supply / gas discharge and liquid discharge / gas supply are possible.
  • liquid supply means 32A and the gas discharge means 33A are operated with the valve 34b and the valve 35b opened, the liquid supply / gas discharge to the outer room 31B is performed in the outer room 31B which is the outer space of the inner side surface portion 31s.
  • liquid discharge and gas supply are possible.
  • the inner room 31A which is the inner space of the inner side surface portion 31f
  • the outer room 31B which are the outer spaces of the inner side surface portion 31f
  • the radiation dose in this portion is not reduced.
  • the inner room 31A that is the inner space of the inner side surface portion 31f and the middle room 31C that is the outer space of the inner side surface portion 31f inside the inner side surface portion 31s are filled with liquid, and the outer room 31B is filled with liquid. Without reducing the radiation dose in this portion.
  • the radiation irradiation apparatus 20 of the present embodiment it is possible to achieve the same effects as the first to fifth embodiments described above, and further, the inner room 31A, the middle room 31C, and the outer room 31B of the container 31.
  • the flattened state can be easily switched.
  • the valves 34a, 34b, 35c, 35a, 35b, and 35c as appropriate to operate the liquid supply means 32A and the gas discharge means 33A, the liquid filling state in the inner room 31A, the middle room 31C, and the outer room 31B is achieved. By switching, the mode can be easily switched.
  • X-rays are used as treatment bundles.
  • the container 31 of the flatness filter 30 can be configured to also serve as a scattering foil.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Radiation-Therapy Devices (AREA)

Abstract

Afin de permettre le basculement entre un mode de fonctionnement utilisant un filtre compensateur dans lequel une distribution de dose de rayonnement est uniforme et un mode de fonctionnement sans filtre compensateur et dans le but de miniaturiser l'appareil, la présente invention comprend une source de rayonnement (21) et un filtre (30) qui atténue le rayonnement irradié depuis la source de rayonnement, le filtre comprenant : sur l'intérieur de celui-ci, un récipient (31) pouvant contenir un liquide qui atténue le rayonnement ; et des moyens de commutation (32A), (33A) qui permettent de placer et de retirer le liquide à l'intérieur du récipient.
PCT/JP2015/051080 2015-01-16 2015-01-16 Appareil d'irradiation de rayonnement WO2016113906A1 (fr)

Priority Applications (1)

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PCT/JP2015/051080 WO2016113906A1 (fr) 2015-01-16 2015-01-16 Appareil d'irradiation de rayonnement

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Application Number Priority Date Filing Date Title
PCT/JP2015/051080 WO2016113906A1 (fr) 2015-01-16 2015-01-16 Appareil d'irradiation de rayonnement

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WO2016113906A1 true WO2016113906A1 (fr) 2016-07-21

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0447300A (ja) * 1990-06-15 1992-02-17 Mitsubishi Electric Corp 高エネルギー放射線装置
JP2001517316A (ja) * 1998-01-23 2001-10-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ フィルタを有するｘ線検査装置
JP2003512113A (ja) * 1999-10-18 2003-04-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 吸収率が調整可能なフィルタ素子を有するフィルタを具えたｘ線装置
JP2003531386A (ja) * 2000-04-17 2003-10-21 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 動的に調整可能な吸収率を有するフィルタを備えたｘ線機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0447300A (ja) * 1990-06-15 1992-02-17 Mitsubishi Electric Corp 高エネルギー放射線装置
JP2001517316A (ja) * 1998-01-23 2001-10-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ フィルタを有するｘ線検査装置
JP2003512113A (ja) * 1999-10-18 2003-04-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 吸収率が調整可能なフィルタ素子を有するフィルタを具えたｘ線装置
JP2003531386A (ja) * 2000-04-17 2003-10-21 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 動的に調整可能な吸収率を有するフィルタを備えたｘ線機器

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