JP7126820B2 - Verification phantom and radiation therapy support method - Google Patents

Description

An embodiment of the present invention relates to a verification phantom and a radiotherapy support method.

In radiation therapy, it is required to irradiate the site to be treated (target) with an effective dose of radiation while suppressing the dose to a level that does not cause radiation damage to normal tissues around the target. Therefore, when performing radiotherapy, the three-dimensional positional information of the target and the surrounding structure are specified in advance using an X-ray CT (Computed Tomography) device or an MRI (Magnetic Resonance Imaging) device, etc., and the planned irradiation dose is determined. A decision is made and a radiation treatment plan is developed. Here, a verification phantom is used to verify whether or not the radiation is irradiated according to the treatment plan before irradiating the body to be treated with radiation based on the radiotherapy plan.

Japanese Patent Publication No. 2016-536085

A problem to be solved by the present invention is to more accurately verify whether or not radiation is irradiated according to a treatment plan.

A verification phantom according to an embodiment includes an external part, an internal part, and a dosimeter. The outer part is shaped to imitate the body shape of the subject to be treated. The visceral part imitates the shape of each organ in the subject to be treated, includes a plurality of organ phantoms modeled using materials having properties similar to those of the corresponding organ, and is incorporated in the outer shape part. A dosimeter is placed at a predetermined position in the viscera.

FIG. 1A is a diagram illustrating an example of a verification phantom according to the first embodiment; FIG. 1B is a diagram illustrating an example of a verification phantom according to the first embodiment; FIG. 2A is a diagram for explaining the modeling divisions of the verification phantom according to the first embodiment; FIG. 2B is a diagram for explaining the modeling divisions of the verification phantom according to the first embodiment; FIG. 3 is a diagram showing an example of the configuration of a radiotherapy system according to the second embodiment. FIG. 4 is a diagram showing an example of the configuration of a radiotherapy support apparatus according to the second embodiment. FIG. 5 is a diagram for explaining an example of verification information generated by a generation function according to the second embodiment.

A verification phantom and a radiotherapy support method according to an embodiment will be described below with reference to the accompanying drawings. Moreover, the verification phantom and radiation therapy support method according to the present application are not limited to the embodiments described below.

(First embodiment)
1A and 1B are diagrams showing an example of a verification phantom 100 according to the first embodiment. Here, FIG. 1A shows an external view of a verification phantom 100 and an organ phantom incorporated in the verification phantom 100. FIG. Also, FIG. 1B shows a cross-sectional view of the verification phantom 100 .

As shown in FIG. 1A, verification phantom 100 includes human body phantom 110 and organ phantom group 120 . The human body phantom 110 is a phantom that simulates the external shape of a human body, has a space formed therein, and contains an internal organ phantom group 120 . Here, the human body phantom 110 is shaped to imitate the body shape of the subject to be treated. Specifically, the human body phantom 110 is modeled for each body to be treated or for each section divided by age, sex, and physique.

For example, as shown in FIG. 1A, the human body phantom 110 is modeled to simulate a chest including bones, and contains an organ phantom group 120 including the chest. Note that the human body phantom 110 of the chest shown in FIG. 1 is merely an example, and the human body phantom 110 may be modeled for various other parts (head, abdomen, etc.). Also, the human body phantom 110 may be modeled not only for each part of the human body but also for the whole body.

Here, the human body phantom 110 is formed using a tissue-equivalent material and a bone-equivalent material having a radiation absorption rate equivalent to that of the human body. Any material may be used as long as it has a radiation absorptivity equivalent to that of the human body. For example, the human body phantom 110 is shaped according to each size of the chest for each subject to be treated or for each section divided by age, sex and build. At this time, the human body phantom 110 is modeled with a tissue-equivalent material for the skin portion and a bone-equivalent material for the bone portion. It should be noted that the human body phantom 110 is an example of an outer shape part in the scope of claims.

The organ phantom group 120 includes a plurality of organ phantoms that imitate the shape of each organ in the subject to be treated and are modeled using materials that have properties similar to those of the corresponding organ, and are built into the external shape. For example, the chest organ phantom group 120 includes organ phantoms such as lungs, heart, liver, and various blood vessels, which are built into the human body phantom 110, as shown in FIG. 1A.

Here, in the organ phantom group 120, each organ phantom is modeled with a tissue-equivalent material having a radiation absorption rate equivalent to that of each organ. For example, a lung organ phantom is built using a tissue-equivalent material that has a radiation absorption rate similar to that of the lung. Also, for example, a heart organ phantom is modeled using a tissue-equivalent material having a radiation absorption rate equivalent to that of the heart. In this way, each organ phantom included in the organ phantom group 120 is modeled using its own tissue-equivalent material.

Also, the organ phantom group 120 is modeled by simulating the shape of the organ in the subject. Specifically, the shapes of the plurality of organ phantoms in the organ phantom group 120 are determined based on the three-dimensional medical image data acquired from the subject. Then, the organ phantom group 120 is modeled by, for example, a three-dimensional object modeling device (also called a 3D printer). In such a case, modeling data is generated using volume data of regions corresponding to each organ in the three-dimensional medical image data (volume data) collected from the subject. Here, the modeling data is data for modeling the selected site as a three-dimensional object by the 3D printer, and is, for example, data in the STL (Standard Triangulated Language) format.

For example, modeling data corresponding to each organ is generated using data of regions corresponding to the lungs, heart, liver, etc. in chest volume data collected from the subject. Then, each modeling data is input to a 3D printer, and an organ phantom corresponding to each organ is modeled by the 3D printer. At this time, a tissue-equivalent material having a radiation absorption rate equivalent to that of each organ is used as the material used in the 3D printer.

In addition, as a modeling method using a 3D printer, for example, a method of irradiating a liquid photocurable composition with laser light or ultraviolet rays to cure the irradiated portion, or a method of applying a photocurable liquid onto a substrate by inkjet. A method or the like is used in which the liquid is made to land, and the liquid that has landed is irradiated with ultraviolet rays to be cured.

Then, the modeled organ phantom group 120 is built in the human body phantom 110 in such a manner that a plurality of organ phantoms are arranged so as to resemble the arrangement of each organ in the subject to be treated. For example, as shown in FIG. 1B, organ phantoms such as lungs, heart, and liver are embedded inside a human body phantom 110 so as to approximate the arrangement of the actual organs in the subject. In such a case, for example, actual positional information of each organ is obtained from volume data collected from the subject, and each organ phantom is arranged in the human body phantom 110 based on the obtained positional information. The organ phantom group 120 is an example of internal organs in the scope of claims.

Here, a water-equivalent material, a fat-equivalent material, or the like may be injected into the gap 140 between the organ phantoms. For example, a water-equivalent material, a fat-equivalent material, or the like is injected into the gap 140 between each organ phantom to fix each organ at the arranged position. Here, the material to be injected may be determined according to the amount of visceral fat of the body to be treated.

Further, the verification phantom 100 has a built-in dosimeter at a predetermined position. Specifically, the dosimeter is arranged at least one of the position of the treatment target site in the organ phantom group 120 and the organ having relatively high radiation sensitivity. For example, as shown in FIG. 1B, the dosimeter 131 is placed at the center of the treatment target region 121 in the verification phantom 100 by being inserted into the position of the treatment target region 121 in the organ phantom. Also, for example, as shown in FIG. 1B, the dosimeter 132 is placed in the spinal cord of the verification phantom 100 by being inserted into the spinal cord region of the human body phantom. The dosimeter 131 and the dosimeter 132 are examples of dosimeters in the scope of claims.

Here, the number and placement positions of the dosimeters can be arbitrarily determined according to the subject to be treated or the treatment plan. For example, when the site to be treated is large, a plurality of dosimeters may be arranged in a single site to be treated. Further, for example, when a plurality of organs with relatively high radiosensitivity are included in the irradiation range of radiation, a dosimeter may be arranged for each organ.

Here, the position of the dosimeter placed inside the verification phantom 100 can be arbitrarily changed. For example, dosimeter 131 and dosimeter 132 shown in FIG. 1B can be removed and placed in other locations. That is, the dosimeters 131 and 132 can be detached from the treatment target region 121 and the spinal cord and inserted into other organ phantoms or the like to change their positions arbitrarily. This allows the verification phantom 100 to easily acquire dose information at any position. The verification phantom 100 can transmit the dose information acquired by the dosimeter to a verification device connected by wire or wirelessly.

As described above, the verification phantom 100 imitates the shape of each organ in the subject to be treated in the human body phantom 110 that is modeled after the body shape of the subject to be treated, and is made of materials whose properties are similar to those of the corresponding organs. A plurality of organ phantoms that are shaped using are built in, and dosimeters are placed at predetermined positions. Therefore, by using this verification phantom 100, it is possible to perform the same measurement as actually measuring the dose in the body of the subject, and to more accurately determine whether or not the radiation is irradiated according to the treatment plan. can be verified accurately.

Here, the verification phantom 100 may be modeled uniquely for each subject to be treated, or may be modeled according to age, sex, and physique. An example of modeling divisions of the verification phantom 100 according to the first embodiment will be described below with reference to FIGS. 2A and 2B. 2A and 2B are diagrams for explaining the modeling divisions of the verification phantom 100 according to the first embodiment.

For example, in the verification phantom 100, a unique verification phantom is formed for each subject to be treated, and as shown in FIG. 2A, each phantom ID is associated with the subject ID and managed. As an example, a unique ID is assigned to a verification phantom that is modeled using volume data collected from a subject with "subject ID: 001" and corresponds to "subject ID: 001". and managed.

Also, for example, the verification phantom 100 is modeled in sections divided by age, sex, and build, and managed by associating a phantom ID with each section, as shown in FIG. 2B. For example, as shown in FIG. There are divisions for "sex: male" by physique, and divisions for "adult" and "sex: female" by physique. Then, a verification phantom is formed for each section, a phantom ID is assigned to each verification phantom, and managed in association with each section.

In such a case, for example, the verification phantom 100 is modeled using standard three-dimensional image data of the human body representing each section. To give an example, first, the physique in each category is classified according to the range of height and weight. Then, for each segment, a verification phantom 100 is built using volume data collected from a human body having a physique that approximates the average value in that range. For example, for a category divided into “adult, gender: male, build: height 160cm-170cm, weight 50kg-60kg”, “adult” “male” has “height: about 165cm” and “weight: about 55kg”. A verification phantom 100 is modeled using volume data collected from a human body having a physique.

Here, the volume data used in each section is not limited to that of the body to be treated that is the target of radiotherapy, but volume data collected from the subject examined by an X-ray CT device, an MRI device, or the like. may be used.

As described above, the verification phantom 100 may be shaped unique to the subject to be treated, or may be shaped for each section divided according to the body size. For example, in the case of normal verification, the verification phantom 100 is used for each section divided according to the body size, and in the case of more accurate verification, the verification phantom 100 unique to the subject to be treated is shaped. can be

As described above, according to the first embodiment, the human body phantom 110 is modeled after the body shape of the subject to be treated. The organ phantom group 120 is built in the human body phantom 110 and includes a plurality of organ phantoms modeled using materials having properties similar to those of the corresponding organs, imitating the shape of each organ in the subject. The dosimeters are placed at predetermined positions in the organ phantom group 120 . Therefore, the verification phantom 100 according to the first embodiment makes it possible to more accurately verify whether or not the body to be treated is irradiated with radiation according to the treatment plan.

The organ phantom group 120 is built in the human body phantom 110 with a plurality of organ phantoms arranged so as to approximate the arrangement of the organs in the subject. Therefore, the verification phantom 100 according to the first embodiment makes it possible to more accurately verify the dose of radiation applied to each organ in the subject.

Shapes of the plurality of organ phantoms are determined based on three-dimensional medical image data acquired from the subject. Therefore, the verification phantom 100 according to the first embodiment makes it possible to form an organ phantom that accurately imitates each organ in a subject to be treated.

The dosimeter is arranged at least one of the position of the treatment target site and the organ having relatively high radiation sensitivity in the organ phantom group 120 . Therefore, the verification phantom 100 according to the first embodiment makes it possible to accurately measure the dose of the organ to be verified.

The human body phantom 110 and the organ phantom group 120 are modeled for each subject to be treated. Therefore, the verification phantom 100 according to the first embodiment makes it possible to obtain dose information similar to that obtained when the body to be treated is actually irradiated with radiation.

The human body phantom 110 and the organ phantom group 120 are modeled by age, sex, and body type. Therefore, the verification phantom 100 according to the first embodiment enables more accurate verification without molding the verification phantom 100 for each object to be treated.

(Second embodiment)
Next, verification using the verification phantom 100 described in the first embodiment will be described. Hereinafter, in the second embodiment, verification of a treatment plan formulated in a radiotherapy system will be described as an example. FIG. 3 is a diagram showing an example of the configuration of the radiotherapy system 1 according to the second embodiment. For example, the radiotherapy system 1 includes a medical image diagnostic apparatus 10, a treatment planning apparatus 20, a radiotherapy support apparatus 30, and a radiotherapy apparatus 40, as shown in FIG. Here, the radiotherapy support apparatus 30 according to the second embodiment presents dose information using measurement results obtained by the verification phantom 100 . The configuration shown in FIG. 3 is merely an example, and the embodiment is not limited to this. For example, the radiotherapy system 1 may include various other devices.

The medical image diagnostic apparatus 10 is an apparatus that collects medical image data of a subject to be treated. (Positron Emission Tomography) apparatus, SPECT (Single Photon Emission Computed Tomography) apparatus, and the like. Here, the medical image diagnostic apparatus 10 can generate three-dimensional medical image data (volume data). For example, a radiotherapy planning CT apparatus as the medical image diagnostic apparatus 10 collects CT volume data including a treatment target site (tumor, etc.) of a subject, and transmits the collected CT volume data to the treatment planning apparatus 20 or the like. do.

The treatment planning apparatus 20 makes a treatment plan for radiotherapy by the radiotherapy apparatus 40 using the CT volume data of the object to be treated acquired by the radiotherapy planning CT apparatus. For example, the treatment planning apparatus 20 uses CT volume data acquired by a radiotherapy planning CT apparatus to identify the position of the treatment target site within the body to be treated. Further, for example, the treatment planning apparatus 200 plans the radiation dose, the irradiation angle, the number of times of irradiation, and the like to be irradiated by the radiotherapy apparatus 40 to a tumor or the like whose position is specified using the CT volume data. The treatment planning apparatus 20 then transmits the established treatment plan to the radiotherapy support apparatus 30 and the radiotherapy apparatus 40 .

The radiotherapy apparatus 40 irradiates the body to be treated with radiation according to the treatment plan by the treatment planning apparatus 20 to perform radiotherapy. Here, the radiation therapy apparatus 40 performs radiation therapy according to the treatment plan for which the verification results are approved in the verification performed using the radiation therapy support apparatus 30 . In addition, the radiotherapy apparatus 40 performs irradiation for verification of the treatment plan prior to irradiation of the body to be treated with radiation. Specifically, the radiotherapy apparatus 40 irradiates the verification phantom 100 with radiation according to the treatment plan received from the treatment planning apparatus 20 . The verification phantom 100 transmits dose information acquired by the built-in dosimeter to the radiotherapy support apparatus 30 .

Here, in the radiotherapy system 1 , radiotherapy can be performed by aligning the coordinate system of the medical image diagnostic apparatus 10 and the coordinate system of the radiotherapy apparatus 40 . For example, in the radiotherapy system 1, the coordinate system of the radiotherapy planning CT apparatus and the coordinate system of the radiotherapy apparatus 40 are aligned in advance, so that the radiotherapy apparatus 40 is set up by the treatment planning apparatus 20. Radiation can be delivered according to a treatment plan.

The radiotherapy support device 30 is a device that verifies the treatment plan drawn up by the treatment planning device 20 . Specifically, the radiotherapy support apparatus 30 generates information used for verification based on the dose information received from the verification phantom 100, and presents the information to a doctor or the like. FIG. 4 is a diagram showing an example of the configuration of a radiotherapy support apparatus 30 according to the second embodiment. As shown in FIG. 4, the radiotherapy support apparatus 30 has, for example, a communication interface 31, a memory circuit 32, an input interface 33, a display 34, and a processing circuit 35. The radiotherapy support apparatus 30 is realized by computer equipment such as a workstation.

The communication interface 31 is connected to the processing circuit 35 and controls transmission and reception of dose information to and from the verification phantom 100 connected via a network. Further, the communication interface 31 controls transmission and communication of various data performed among the medical image diagnostic apparatus 10, the treatment planning apparatus 20, and the radiotherapy apparatus 40 which are connected via a network. For example, the communication interface 31 is implemented by a network card, network adapter, NIC (Network Interface Controller), or the like. In this embodiment, the communication interface 31 can also receive real-time dose information acquired by the verification phantom 100 and output it to the processing circuitry 35 .

The storage circuit 32 is connected to the processing circuit 35 and stores various data. For example, the storage circuit 32 is implemented by a semiconductor memory device such as a RAM (Random Access Memory) or flash memory, a hard disk, an optical disk, or the like. In this embodiment, the storage circuit 32 stores medical image data acquired from the medical image diagnostic apparatus 10, treatment plans received from the treatment planning apparatus 20, dose information received from the verification phantom 100, and the like. For example, the storage circuit 32 stores dose information measured by a dosimeter built into the verification phantom 100 .

The storage circuit 32 also stores various information used in the processing of the processing circuit 35, processing results of the processing circuit 35, and the like. For example, the storage circuit 32 stores information generated based on dose information received from the verification phantom 100 . The details of this information will be described later.

The storage circuit 32 also stores programs corresponding to various functions that are read out and executed by the processing circuit 35 . For example, the storage circuit 32 stores a program corresponding to a control function 351, a program corresponding to an acquisition function 352, and a program corresponding to a generation function 353, which are read and executed by the processing circuit 35. FIG. In FIG. 4, the single memory circuit 32 stores the programs corresponding to the processing functions, but a plurality of memory circuits may be arranged in a distributed manner so that the processing circuit 35 is an individual memory circuit. A configuration in which the corresponding program is read from the .

The input interface 33 includes a trackball for setting a predetermined area (for example, a region of interest), a switch button, a mouse, a keyboard, a touch pad for performing an input operation by touching an operation surface, a display screen and a touch pad. It is realized by a touch screen integrated with and, a non-contact input circuit using an optical sensor, a voice input circuit, and the like.

The input interface 33 is connected to the processing circuit 35 , converts an input operation received from an operator into an electric signal, and outputs the electric signal to the processing circuit 35 . It should be noted that the input interface 33 in this specification is not limited to having physical operation parts such as a mouse and a keyboard. For example, the input interface includes an electrical signal processing circuit that receives an electrical signal corresponding to an input operation from an external input device provided separately from the device and outputs the electrical signal to the control circuit.

The display 34 is connected to the processing circuit 35 and displays various information and various images output from the processing circuit 35 . For example, the display 34 is realized by a liquid crystal monitor, a CRT (Cathode Ray Tube) monitor, a touch panel, or the like. For example, the display 34 displays a GUI (Graphical User Interface) for receiving instructions from the operator, various images, and various processing results by the processing circuit 35 .

The processing circuit 35 executes various processes in the radiotherapy support apparatus 30 . For example, the processing circuit 35 performs various processes by reading programs corresponding to the control function 351, the acquisition function 352, and the generation function 353 from the storage circuit 32 and executing them. Here, each processing function realized by the processing circuit 35 shown in FIG. 4 is recorded in the storage circuit 32 in the form of a computer-executable program. The processing circuit 35 is a processor that reads out each program from the storage circuit 32 and executes it, thereby realizing functions corresponding to each program.

Note that the term “processor” used in the description of the radiotherapy support apparatus 30 described above is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an Application Specific Integrated Circuit: ASIC), programmable logic devices (e.g., Simple Programmable Logic Device (SPLD), Complex Programmable Logic Device (CPLD), and Field Programmable Gate Array (FPGA)), etc. means the circuit of The processor realizes its functions by reading and executing the programs stored in the memory circuit. Note that instead of storing the program in the memory circuit 32, the program may be configured to be directly installed in the circuit of the processor. In this case, the processor implements its functions by reading and executing the program embedded in the circuit. Note that each processor of the present embodiment is not limited to being configured as a single circuit for each processor, and may be configured as one processor by combining a plurality of independent circuits to realize its function. good.

The control function 351 controls the operation of the radiotherapy support apparatus 30 as a whole. For example, the control function 351 controls each component of the radiotherapy support apparatus 30 according to input operations received from the operator via the input interface 33 . For example, the control function 351 causes the storage circuit 32 to store medical image data and treatment plans output from the communication interface 31 . Further, the control function 351 reads medical image data from the storage circuit 32 and causes the display 34 to display a medical image generated from the read medical image data. The control function 351 also executes various processes on the medical image data and causes the display 34 to display the process results.

The acquisition function 352 acquires dose information measured by the verification phantom 100 . Specifically, the acquisition function 352 acquires dose information measured by a dosimeter built into the verification phantom 100 . That is, the acquisition function 352 acquires dose information at the position where the dosimeter is embedded.

A generation function 353 generates verification information based on the dose information. Specifically, the generation function 353 generates information for comparing the dose calculated in the treatment plan and the acquired dose information. For example, the generation function 353 generates information indicating the difference between the dose in the dose distribution map generated in the treatment plan and the dose information acquired by the verification phantom 100 .

FIG. 5 is a diagram for explaining an example of verification information generated by the generation function 353 according to the second embodiment. Here, FIG. 5 shows a dose distribution map included in the treatment plan generated by the treatment planning apparatus 20. As shown in FIG. For example, the generation function 353 extracts the dose information of the area corresponding to the position where the dosimeter is arranged in the dose distribution map shown in FIG. Then, the generation function 353 calculates difference information between the extracted dose information and the dose information received from the verification phantom 100, and generates the calculated difference information. Here, when a plurality of dosimeters are arranged (when a plurality of dose information are acquired from the verification phantom 100), the generation function 353 generates dose information of the area corresponding to the position of each dosimeter in the dose distribution map. are extracted and compared with the measurement results obtained by dosimeters.

The dose distribution map is three-dimensionally calculated by the treatment planning apparatus 20 as shown in FIG. For example, the treatment planning apparatus 20 calculates a dose distribution map by various computer simulations using parameters such as the number of radiation gates, energy, administered dose, and tissue radiation absorption rate.

The control function 351 causes the display 34 to display the verification information generated by the generation function 353 . For example, the control function 351 causes the display 34 to display the difference information generated by the generation function 353 . For example, the control function 351 displays difference information at corresponding positions in the dose distribution map shown in FIG.

As described above, according to the second embodiment, the acquisition function 352 acquires dose information measured by the verification phantom 100 . A generation function 353 generates verification information based on the dose information. The control function 351 causes the display 34 to display the verification information. Therefore, the radiotherapy support apparatus 30 according to the second embodiment makes it possible to easily compare the dose information acquired by the verification phantom 100 and the dose calculated in the treatment plan, thereby making it possible to obtain more accurate information. Allows verification to be performed more easily.

(Other embodiments)
Now, although the first and second embodiments have been described so far, various different forms may be implemented in addition to the above-described embodiments.

In the above-described embodiment, the case where the organ phantom group 120 is modeled by a 3D printer has been described. However, the embodiment is not limited to this, and the organ phantom group 120 may be modeled by other methods.

Also, each component of each device illustrated in the above-described embodiment is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution and integration of each device is not limited to the one shown in the figure, and all or part of them can be functionally or physically distributed and integrated in arbitrary units according to various loads and usage conditions. Can be integrated and configured. Further, each processing function performed by each device may be implemented in whole or in part by a CPU and a program analyzed and executed by the CPU, or implemented as hardware based on wired logic.

Further, the radiotherapy support method described in the above embodiments can be realized by executing a prepared radiotherapy support program on a computer such as a personal computer or a workstation. This radiotherapy support program can be distributed via a network such as the Internet. In addition, this radiotherapy support program may be recorded on a computer-readable recording medium such as a hard disk, flexible disk (FD), CD-ROM, MO, DVD, etc., and may be executed by being read from the recording medium by a computer. can.

As described above, according to the first and second embodiments, or other embodiments, it is possible to more accurately verify whether or not the radiation is irradiated according to the treatment plan.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

1 radiotherapy system 30 radiotherapy support device 35 processing circuit 100 verification phantom 110 human body phantom 120 organ phantom group 131, 132 dosimeter 351 control function 352 acquisition function 353 generation function

Claims (7)

an external part shaped to imitate the body shape of the subject to be treated;
A plurality of organ phantoms that imitate the shape of each organ in the object to be treated and are made of a tissue-equivalent material having a radiation absorptivity corresponding to each organ are built in positions corresponding to the respective organs in the contour section. and
a dosimeter placed at a predetermined position in the internal organs;
a water-equivalent material and a fat-equivalent material that are injected into the gaps of the plurality of organ phantoms and fix the positions of the plurality of organ phantoms;
A verification phantom. 2. The phantom for verification according to claim 1, wherein said visceral part is built in said contour part, arranged such that said plurality of organ phantoms approximates the arrangement of each organ in said subject to be treated. 3. The verification phantom according to claim 1, wherein shapes of said plurality of organ phantoms are determined based on three-dimensional medical image data acquired from said subject to be treated. The verification phantom according to any one of claims 1 to 3, wherein the dosimeter is arranged in at least one of a position of a treatment target site in the internal organs and an organ having relatively high radiation sensitivity. The verification phantom according to any one of claims 1 to 4, wherein the external part and the internal part are shaped for each of the subjects to be treated. an external part shaped to imitate the body shape of the subject to be treated;
A plurality of organ phantoms that imitate the shape of each organ in the object to be treated and are made of a tissue-equivalent material having a radiation absorptivity corresponding to each organ are built in positions corresponding to the respective organs in the contour section. and
a dosimeter placed at a predetermined position in the internal organs;
with
The outer part and the visceral part are selected from a plurality of outer parts and a plurality of visceral parts classified by age, sex, and physique, and the outer part and the visceral part corresponding to the age, sex, and physique of the subject are selected. A verification phantom that is selected and shaped. A radiotherapy support method performed by a radiotherapy support apparatus that supports radiotherapy,
Acquiring dose information measured by the verification phantom according to any one of claims 1 to 6,
generating verification information based on the dose information;
displaying the verification information on a display unit;
A radiotherapy support method, comprising:

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