Radiation irradiation device

Abstract

To make it possible to efficiently notify setting about irradiation of radiation.SOLUTION: A radiation irradiation device includes: a radiation irradiation part irradiating a person to be treated with radiation; a radiation irradiation setting part setting irradiation of the radiation; a visible light irradiation part which irradiates a range irradiated with the radiation on the body surface of the person with visible light and forms a light field; and a light field control part which varies irradiation modes of the visible light in accordance with the setting of the irradiation of the radiation. In such a constitution, setting related to irradiation of the radiation can be confirmed visually.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a radiation irradiation apparatus and a radiation irradiation method. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2004-209259 (Patent Document 1) describes a technique for visualizing the radiation irradiation range of a therapeutic radiation irradiation device. This publication states, "A method for positioning an X-ray device and a patient relative to each other, comprising the steps of providing, with respect to the X-ray device, an LED array for generating a light beam and directing the light beam in a direction of a given axis so that the light beam spreads outward from the LED array at a beam cone angle, positioning a lens in the path of the light beam for spreading the beam cone angle outward, positioning the patient and the X-ray device relative to each other so that the light beam is incident on a specified target area of ​​the patient, and generating an X-ray beam using the X-ray device and directing the X-ray beam on the given axis and onto the specified target area of ​​the patient." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-209259 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional technologies visualize the area irradiated by a radiation irradiation device as a light field, but do not consider how the radiation is irradiated. For example, even if a radiation irradiation device can switch between an FF (Flattening Filter) mode, which irradiates radiation uniformly using a flattening filter, and an FFF (Flattening Filter Free) mode, which does not use a flattening filter and generates an intensity peak within the irradiation area, the light field is irradiated in the same way, and does not contribute to determining which mode is selected. The operation terminal of the radiation irradiator can display the selected mode, but since the operation terminal is located in a separate room from the radiation irradiator, the operator who operates the radiation irradiator to provide treatment cannot check the mode while setting up the patient in the radiation irradiator, which can lead to inconsistencies between the setup and the mode. Such a problem occurs not only in the cases of FF and FFF, but also in the cases where the intensity of radiation is changeable or where one of a plurality of filters can be selected and used.

[0005] Therefore, an object of the present invention is to enable efficient notification of settings related to radiation irradiation. [Means for solving the problem]

[0006] In order to achieve the above object, one representative radiation irradiation device of the present invention includes a radiation irradiation unit that irradiates radiation to a subject of treatment, a radiation irradiation setting unit that performs settings related to the irradiation of the radiation, a visible light irradiation unit that irradiates with visible light an area on the body surface of the subject that is to be irradiated with the radiation to form a light irradiation field, and a light irradiation field control unit that varies the irradiation mode of the visible light depending on the settings related to the irradiation of the radiation. Furthermore, one representative radiation irradiation method of the present invention includes a radiation irradiation setting step in which a radiation irradiation device sets settings related to the radiation to be irradiated to a subject of treatment; a visible light irradiation step in which the radiation irradiation device irradiates with visible light an area on the body surface of the subject to be irradiated with the radiation to form a light irradiation field; and a step in which the radiation irradiation device irradiates the subject with the radiation, wherein the irradiation mode of the visible light irradiated in the visible light irradiation step differs depending on the settings related to the radiation irradiation. [Effects of the Invention]

[0007] According to the present invention, it is possible to efficiently notify settings related to radiation irradiation. Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0008] [Figure 1] Illustrative diagram of radiation irradiation according to an embodiment [Figure 2] Radiation irradiation device configuration diagram [Figure 3] 1 is a flowchart showing a processing procedure relating to setting of radiation irradiation. [Figure 4] Illustration of switching the light field [Figure 5] Illustration of the configuration for changing the distance from the LED to the diffuser [Figure 6] Diagram of the configuration for changing the distance from the LED to the lens [Figure 7] An explanatory diagram of the shape of the radiation irradiation range and the peak of radiation intensity [Figure 8] Explanatory diagram of radiation irradiation settings and irradiation mode of light field DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. [Example]

[0010] FIG. 1 is an explanatory diagram of radiation irradiation according to an embodiment. As shown in FIG. 1, the radiation irradiation device 1 includes an operation terminal 10, a radiation irradiation unit 20, a visible light irradiation unit 30, and a multi-leaf collimator 40.

[0011] The radiation irradiator 20, the visible light irradiator 30, and the multi-leaf collimator 40 are attached to a ring-shaped gantry (not shown), and can irradiate radiation from any angle to the subject of treatment.

[0012] The radiation emitting unit 20 is a unit that generates and emits radiation. Details of the radiation emitting unit 20 will be described later. The visible light irradiating unit 30 is a unit that irradiates visible light. The visible light emitted by the visible light irradiating unit 30 is reflected by the mirror m1 so that it is coaxial with and in the same direction as the radiation. The multi-leaf collimator 40 has a plurality of movable members called leaves, and controls the plurality of leaves to form the shape of the range to be irradiated with radiation.

[0013] The radiation emitted by radiation emitting unit 20 passes through multi-leaf collimator 40 and is irradiated onto a subject of treatment, so that radiation irradiation range A1 has a shape formed by multi-leaf collimator 40. Furthermore, the visible light emitted by the visible light irradiator 30 is reflected by the mirror m1 to become coaxial and directional with the radiation, and then passes through the multi-leaf collimator 40 in the same manner as the radiation, and is irradiated onto the subject of treatment. Therefore, the range on the subject's body surface irradiated with the visible light becomes a light irradiation field A2 that is substantially the same as the radiation irradiation range A1. Although radiation is invisible, the radiation irradiation range A1 can be visualized by irradiating the light irradiation field A2 with visible light.

[0014] The radiation irradiator 20, the visible light irradiator 30, and the multi-leaf collimator 40 are installed in a radiation-shielded radiation treatment room. On the other hand, the operation terminal 10 is installed in an operation room different from the radiation treatment room. The operation terminal 10 receives operations from an operator and controls the operations of the radiation irradiator 20, the visible light irradiator 30, and the multi-leaf collimator 40.

[0015] Specifically, the operation terminal 10 transmits leaf control instructions to the multi-leaf collimator 40 to control the shape of the radiation irradiation range A1. Furthermore, the operation terminal 10 can specify settings related to radiation irradiation to the radiation irradiator 20. Specifically, the operation terminal 10 specifies FF (Flattening Filter) or FFF (Flattening Filter Free) to the radiation irradiator 20.

[0016] FF is a mode in which a flattening filter is used to irradiate radiation of uniform intensity in the radiation irradiation range A1. FFF is a mode in which irradiation is performed without using a flattening filter, and in FFF, an intensity peak occurs in the radiation irradiation range A1. In other words, FF is a uniform irradiation setting, and FFF is a non-uniform irradiation setting. FF and FFF are used depending on the treatment plan, so the mode to be used must be selected appropriately for each patient.

[0017] Therefore, the visible light irradiating unit 30 varies the irradiation mode of visible light depending on the setting of the radiation irradiating unit 20. Specifically, the visible light irradiating unit 30 irradiates the light irradiation field A2 uniformly when the setting for radiation irradiation is the uniform irradiation setting (FF), and irradiates the light irradiation field A2 non-uniformly when the setting for radiation irradiation is the non-uniform irradiation setting (FFF).

[0018] In this way, the radiation irradiator 1 can efficiently notify the radiation irradiation settings by matching the radiation irradiation settings with the irradiation mode of visible light in the light irradiation field A2. The operator using this radiation irradiator 1 can recognize the irradiation settings along with the radiation irradiation range while setting up the subject, and can confirm whether the settings are appropriate, thereby reducing the occurrence of errors.

[0019] 2 is a configuration diagram of the radiation irradiation device 1. As shown in FIG. A CPU (Central Processing Unit) 11 executes a treatment beam control program 121 loaded in a memory 12 to control the operation of the radiation irradiation apparatus. The memory 12 is a main storage device of the operation terminal 10, and is used to develop a treatment beam control program 121 and store various data. The communication unit 13 is a communication interface that communicates with the radiation irradiating unit 20, the visible light irradiating unit 30, and the multi-leaf collimator 40.

[0020] The treatment beam control program 121 determines how radiation is to be irradiated depending on the subject of treatment, and controls the operations of the radiation irradiator 20 and the multi-leaf collimator 40. The operational control of the radiation irradiator 20 includes designating the mode (FF or FFF), designating the radiation intensity, starting irradiation, stopping irradiation, and the like. The operational control of the multi-leaf collimator 40 includes the transmission of leaf control instructions that specify the shape of the radiation irradiation area A1.

[0021] The radiation irradiation unit 20 includes a radiation irradiation setting unit 21 , an electron gun 22 , an acceleration tube 23 , an X-ray target 24 , a fixed collimator 25 , a smoothing filter 26 , and a filter driver 27 . The electron beam emitted by the electron gun 22 is accelerated by an accelerating tube 23 and converted into X-rays by an X-ray target 24. The X-rays are output via a fixed collimator 25. Alternatively, the X-rays are output after passing through the fixed collimator 25 and further passing through a flattening filter 26.

[0022] The FF mode of the radiation emitting unit 20 is when radiation is output after passing through the smoothing filter 26. The FFF mode of the radiation emitting unit 20 is when radiation is output without passing through the smoothing filter 26. The filter driver 27 switches whether the smoothing filter 26 transmits light or not by moving the smoothing filter 26 . The radiation irradiation setting unit 21 performs settings related to radiation irradiation. The settings related to radiation irradiation include settings of radiation intensity and mode (FF or FFF), etc. When setting the mode, the radiation irradiation setting unit 21 operates the filter driving unit 27 in accordance with whether FF or FFF is instructed from the operation terminal 10, and moves the smoothing filter 26 to a position corresponding to the instructed mode.

[0023] The visible light irradiation unit 30 includes a light irradiation field control unit 31 , an LED (light emitting diode) 32 , and a diffusion plate 33 . A plurality of LEDs 32 are provided, and visible light emitted from the LEDs 32 is output via a diffusion plate 33 . The light irradiation field control unit 31 acquires the mode set in the radiation irradiation unit 20 from the operation terminal 10 and controls the color and brightness of the multiple LEDs 32, thereby switching between uniform irradiation and non-uniform irradiation.

[0024] The multi-leaf collimator 40 has a leaf controller 41 and a plurality of leaves 42. The leaf controller 41 controls the plurality of leaves 42, which are movable members, in response to leaf control instructions from the operation terminal 10, to form the shape of the range to be irradiated with radiation.

[0025] 3 is a flowchart showing the processing procedure for setting radiation irradiation. The radiation irradiation device 1 sequentially executes the processing for radiation irradiation from step S101 onwards.

[0026] Step S101 The operation terminal 10 transmits instructions for settings related to radiation irradiation, such as the intensity and mode (FF or FFF) of radiation, to the radiation irradiation unit 20. The radiation irradiation setting unit 21 of the radiation irradiation unit 20 accepts the instructions from the operation terminal 10 and performs radiation irradiation settings. Then, the process proceeds to step S102.

[0027] Step S102 The radiation irradiation setting unit 21 determines whether the mode set in the radiation irradiation setting is "FF." If the set mode is "FF" (step S102; Yes), the process proceeds to step S103. If the set mode is not "FF" (step S102; No), the process proceeds to step S105.

[0028] Step S103 The radiation irradiation setting unit 21 operates the filter driving unit 27 to set the smoothing filter 26 on the radiation emission axis, and then proceeds to step S104. Step S104 The light irradiation field control unit 31 of the visible light irradiation unit 30 acquires the radiation mode "FF", sets the LED 32 so that the brightness and color of the light irradiation field become uniform, and ends the process.

[0029] Step S105 The radiation irradiation setting unit 21 determines whether the mode set in the radiation irradiation setting is "FFF." If the set mode is "FFF" (step S105; Yes), the process proceeds to step S106. If the set mode is not "FFF" (step S105; No), for example, a predetermined error message is output and the process ends.

[0030] Step S106 The radiation irradiation setting unit 21 operates the filter driving unit 27 to move the smoothing filter 26 away from the radiation emission axis, and then proceeds to step S107. Step S107 The light irradiation field control unit 31 of the visible light irradiation unit 30 acquires the radiation mode "FFF", sets the LED 32 to uniform irradiation, and ends the process.

[0031] 4 is an explanatory diagram of switching of the light irradiation field. As shown in the figure, visible light emitted from the plurality of LEDs 32 is irradiated onto the target via the diffusion plate 33, forming a light irradiation field A2. When the radiation irradiation setting is "FF," the light irradiation field control unit 31 causes the plurality of LEDs 32 to emit light of the same color and brightness. As a result, the light irradiation field A2 is uniformly irradiated. When the radiation irradiation setting is "FFF," the light field control unit 31 causes some of the multiple LEDs 32 to emit light in a color different from the other LEDs 32, thereby making the color of the center of the light field A2 different from the surrounding area.

[0032] As already explained, the visible light emitted by the visible light irradiation unit 30 is reflected by the mirror m1 so that it is coaxial with and in the same direction as the radiation. Therefore, the center of the radiation irradiation range A1 coincides with the center of the light irradiation field A2. Since the peak intensity of the radiation irradiation range A1 is located at the center of the radiation irradiation range A1, making the center of the light irradiation field A2 visible makes it possible to indicate the position where the intensity of the radiation irradiation range A1 reaches its peak.

[0033] The visible light irradiation unit 30 controls the lighting states of the plurality of LEDs 32 to switch the lighting mode of the light irradiation field A2 between uniform lighting and non-uniform lighting. The lighting mode of the light irradiation field A2 can be switched by any method, not limited to controlling the lighting of the LEDs 32.

[0034] A configuration will be described in which the illumination mode of the light illumination field A2 is switched by changing the distance from the light source to a predetermined optical element.

[0035] 5 is an explanatory diagram of a configuration in which the distance from the LEDs 32 to the diffuser plate 33 can be changed. In the configuration of FIG. 5, the brightness of the central LED 32 among the multiple LEDs 32 is higher than that of the other LEDs 32. Visible light emitted by the LEDs 32 is irradiated onto the target via the diffuser plate 33 to form a light irradiation field A2, and the distance of the diffuser plate 33 to the LEDs 32 can be changed.

[0036] 5, when the radiation irradiation setting is "FF," the light field control unit 31 controls the position of the diffuser 33 so that the distance from the LEDs 32 to the diffuser 33 is sufficiently large. As a result, the difference in brightness among the multiple LEDs 32 does not appear in the light field A2, and the irradiation pattern of the light field A2 becomes uniform. 5, when the radiation irradiation setting is "FFF," the light field control unit 31 controls the position of the diffuser 33 so that the distance from the LEDs 32 to the diffuser 33 is sufficiently small. As a result, the difference in luminance among the multiple LEDs 32 appears in the light field A2, and the irradiation pattern of the light field A2 becomes non-uniform.

[0037] 6 is an explanatory diagram of a configuration in which the distance from the LED 32 to the lens 34 can be changed. In the configuration of FIG. 6, the brightness of the central LED 32 among the plurality of LEDs 32 is higher than that of the other LEDs 32. Visible light emitted by the LED 32 is irradiated onto the target via a lens 34 arranged in place of the diffuser plate 33 to form a light irradiation field A2, and the distance of the lens 34 to the LED 32 can be changed.

[0038] 6, when the radiation irradiation setting is "FF," the light field control unit 31 controls the position of the diffuser plate 33 so that the distance from the LEDs 32 to the lens 34 is sufficiently large. As a result, the difference in brightness among the multiple LEDs 32 does not appear in the light field A2, and the irradiation pattern of the light field A2 becomes uniform. 6, when the radiation irradiation setting is "FFF," the light field control unit 31 controls the position of the diffuser plate 33 so that the distance from the LEDs 32 to the lens 34 is sufficiently small. As a result, the difference in brightness among the multiple LEDs 32 appears in the light field A2, and the irradiation pattern of the light field A2 becomes non-uniform.

[0039] In this way, even when a configuration that changes the distance from the light source to a predetermined optical element is used, the radiation irradiation device 1 can switch the irradiation mode of the light irradiation field A2. Note that, similarly to FIG. 4, the center of the radiation irradiation range A1 coincides with the center of the light irradiation field A2, and the position of the peak radiation intensity can be indicated at the position of the central part of the light irradiation field A2.

[0040] Next, the shape of the radiation irradiation area and the peak of the radiation intensity will be described. Figure 7 is an explanatory diagram of the shape of the radiation irradiation area and the peak of the radiation intensity. The multi-leaf collimator 40 controls the leaves 42 based on instructions from the operation terminal 10 to determine the shape of the radiation irradiation area A1. For example, when irradiating a specific organ with radiation, the shape of the radiation irradiation area A1 is determined in accordance with the shape of the organ. If radiation is to be uniformly applied to the entire organ, the radiation irradiating unit 20 operates in mode "FF", and if radiation is to be intensively applied to a part of the organ, the radiation irradiating unit 20 operates in mode "FFF".

[0041] When the radiation irradiator 20 operates in mode "FFF," the position of the peak of radiation intensity in the shape of the radiation irradiation range A1 is important. The peak of radiation intensity is determined by the emission axis, and the peak of radiation intensity is the center position of irradiation by the radiation irradiator 20. Therefore, the positional relationship between the shape of the radiation irradiation range A1 and the peak is adjusted by changing the portion of the radiation irradiated by the radiation irradiator 20 that the leaf 42 cuts out.

[0042] 7 are cut out in the same shape, but the cut-out positions relative to the irradiation center are different. By changing the cut-out positions in this way, it is possible to adjust the peak positions for radiation irradiation ranges A1 of the same shape. When adjusting the peak position for a radiation irradiation range A1 of the same shape, the center of the radiation irradiation range A1 is aligned with the center of the light irradiation field A2, and the irradiation pattern at the center of the light irradiation field A2 is made visible, thereby clearly indicating the peak position of the radiation intensity.

[0043] In the above description, the radiation irradiation settings have been described as FF and FFF. However, the present invention is not limited to this, and the irradiation mode of the light irradiation field can be associated with any radiation irradiation setting.

[0044] FIG. 8 is an explanatory diagram of radiation irradiation settings and irradiation modes of the light irradiation field. If the radiation irradiation settings are "FF" and "FFF", the radiation irradiation device 1 irradiates the light field uniformly when set to "FF", and varies the color and brightness of the light field at the peak position of the radiation when set to "FFF". If the radiation irradiation settings are "radiation: strong" and "radiation: weak", which indicate the intensity of radiation, the radiation irradiation device 1 will irradiate the entire light field in yellow when set to "radiation: strong", and will irradiate the entire light field in red when set to "radiation: weak". If the radiation irradiation setting indicates that any of three or more filters is to be applied, the radiation irradiation device 1, for example, irradiates the center of the light field in green when filter F1 is applied, irradiates the center of the light field in blue when filter F1 is applied, and irradiates the center of the light field in purple when filter F1 is applied.

[0045] In this way, the radiation irradiation device 1 can indicate various settings related to radiation irradiation by the irradiation mode of the light irradiation field A2. It is also possible to combine the irradiation modes of the light irradiation field A2. For example, the color of the light irradiation field A2 may be changed depending on the intensity of the radiation, and whether the radiation irradiation is uniform or not may be indicated by the luminance distribution of the light irradiation field A2.

[0046] As described above, according to the disclosed embodiment, the radiation irradiation device 1 includes a radiation irradiation unit 20 that irradiates radiation to a subject to be treated, a radiation irradiation setting unit 21 that performs settings related to the irradiation of the radiation, a visible light irradiation unit 30 that irradiates with visible light an area on the body surface of the subject to be irradiated with the radiation to form a light irradiation field, and a light irradiation field control unit 31 that varies the irradiation mode of the visible light depending on the settings related to the irradiation of the radiation. Therefore, the radiation irradiating device 1 can efficiently notify the settings related to radiation irradiation as the irradiation mode of visible light.

[0047] Furthermore, the radiation irradiation setting unit 21 can select between a uniform irradiation setting in which the radiation is irradiated uniformly and a non-uniform irradiation setting in which an intensity peak occurs within the range in which the radiation is irradiated, and the light irradiation field control unit 31 irradiates the light irradiation field uniformly when the setting for irradiating the radiation is the uniform irradiation setting, and irradiates the light irradiation field non-uniformly when the setting for irradiating the radiation is the non-uniform irradiation setting. Therefore, the operator of the radiation irradiator 1 can easily check whether the radiation is irradiated uniformly or non-uniformly during the setup of the treatment subject.

[0048] Furthermore, when the setting related to the irradiation of the radiation is the non-uniform irradiation setting, the light irradiation field control unit 31 makes the color of the center of the light irradiation field different from that of the surrounding area. Therefore, the radiation irradiation device 1 can visually notify the user that the radiation irradiation is set to be non-uniform, by displaying a difference in color.

[0049] Furthermore, when the setting related to the irradiation of the radiation is the non-uniform irradiation setting, the light irradiation field control unit 31 makes the luminance of the central part of the light irradiation field higher than that of the periphery. Therefore, the radiation irradiation device 1 can visually notify the user that the radiation irradiation is set to be non-uniform, as a difference in brightness. Specifically, the light field control unit 31 changes the luminance distribution by changing the distance from the light source to a predetermined optical element. Therefore, the radiation irradiation device 1 can change the luminance distribution with a simple configuration.

[0050] Furthermore, when the setting for irradiating the radiation is the non-uniform irradiation setting, the light field control unit 31 makes the color and / or brightness of the light field at the position corresponding to the peak of the radiation intensity different from the surroundings. Therefore, the radiation irradiation device 1 can indicate the peak position of the radiation by the irradiation mode of the visible light.

[0051] The radiation irradiation device 1 further includes a multi-leaf collimator 40 that defines the range to be irradiated with the radiation and the shape of the light irradiation field. This makes it possible to process the shape of the area to be irradiated with radiation and visually display the position within the area where the radiation intensity reaches its peak.

[0052] Furthermore, the radiation irradiation setting unit 21 can change the intensity of the radiation, and the light irradiation field control unit 31 can also irradiate the light irradiation field with a color corresponding to the intensity of the radiation. In this configuration, the intensity of the radiation can be reported as the color of visible light.

[0053] The present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, not only can the configurations be deleted, but also replacements and additions of configurations are possible.

[0054] For example, in the above embodiment, an apparatus that irradiates X-rays is exemplified, but the present invention is not limited to X-rays and can be applied to any apparatus that irradiates therapeutic beams.

[0055] Furthermore, in the above embodiment, the visible light irradiator 30 acquires the radiation irradiation setting from the operation terminal 10 , but the visible light irradiator 30 may acquire the radiation irradiation setting from the radiation irradiator 20 .

[0056] The irradiation mode of the light irradiation field may be switched by inserting or removing a filter. In this case, it is also possible to configure the irradiation mode of the light irradiation field to be switched mechanically in conjunction with the driving of the smoothing filter 26 of the radiation irradiation unit 20. [Explanation of symbols]

[0057] 1: Radiation irradiation device, 10: Operation terminal, 11: CPU, 12: Memory, 13: Communication unit, 20: Radiation irradiation unit, 21: Radiation irradiation setting unit, 22: Electron gun, 23: Acceleration tube, 24: X-ray target, 25: Fixed collimator, 26: Smoothing filter, 27: Filter driver, 30: Visible light irradiation unit, 31: Light irradiation field controller, 32: LED, 33: Diffuser, 34: Lens, 40: Multi-leaf collimator, 41: Leaf controller, 42: Leaf, 121: Treatment beam control program, A1: Radiation irradiation range, A2: Light irradiation field, m1: Mirror

Claims

1. a radiation irradiation unit that irradiates radiation to a subject of treatment; a radiation irradiation setting unit that performs settings related to the irradiation of the radiation; a visible light irradiation unit that irradiates the area on the body surface of the subject that is to be irradiated with the radiation with visible light to form a light irradiation field; a light irradiation field control unit that changes the irradiation mode of the visible light according to settings related to the irradiation of the radiation; Equipped with the radiation irradiation setting unit is capable of selecting a uniform irradiation setting in which the radiation is uniformly irradiated and a non-uniform irradiation setting in which an intensity peak occurs within a range irradiated with the radiation, the light irradiation field control unit uniformly irradiates the light irradiation field when the setting for irradiating the radiation is the uniform irradiation setting, and non-uniformly irradiates the light irradiation field when the setting for irradiating the radiation is the non-uniform irradiation setting.

2. The radiation irradiation device according to claim 1 , wherein the light irradiation field control unit causes a central portion of the light irradiation field to have a different color from surrounding portions when the setting related to the irradiation of the radiation is the non-uniform irradiation setting.

3. The radiation irradiation device according to claim 1 , wherein the light irradiation field control unit increases the luminance of a central portion of the light irradiation field more than that of a periphery thereof when the setting related to the irradiation of the radiation is the non-uniform irradiation setting.

4. The radiation irradiation device according to claim 3 , wherein the light irradiation field control unit changes the luminance distribution by changing a distance from a light source to a predetermined optical element.

5. 2. The radiation irradiation device according to claim 1, wherein the light irradiation field control unit causes a color and / or brightness of the light irradiation field at a position corresponding to a peak intensity of the radiation to differ from that of the surrounding area when the setting for irradiating the radiation is the non-uniform irradiation setting.

6. The radiation irradiation device according to claim 5 , further comprising a multi-leaf collimator that shapes the area where the radiation is irradiated and the shape of the light field.

7. the radiation irradiation setting unit is capable of changing the intensity of the radiation; The radiation irradiation device according to claim 1 , wherein the light field control unit irradiates the light field with a color corresponding to the intensity of the radiation.

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