KR20230169621A - Modular phantom that can easily measure radiation dose and can be transformed into various shapes - Google Patents

Abstract

The present invention is a modular phantom that can simultaneously measure the absolute dose and relative dose of radiation irradiated from a radiation therapy device and can be modified and used in various forms depending on the measurement situation. The modular phantom is a multi-purpose phantom and the above It relates to a modular phantom characterized by comprising a phantom module for rotational irradiation coupled to the upper and lower parts of a multipurpose phantom.

Description

Modular phantom that can easily measure radiation dose and can be transformed into various shapes}

The present invention relates to a modular phantom that can easily measure the absolute dose and relative dose of radiation before radiation treatment and whose shape can be modified depending on the measurement situation.

Radiotherapy is a treatment method that suppresses a tumor by irradiating radiation to the tumor area. Successful radiotherapy involves irradiating a sufficient amount of radiation to the tumor area to achieve the goal of tumor suppression while limiting the amount of radiation to surrounding normal tissues. It is important to minimize the risk of side effects.

Recently, among various radiation treatment methods, intensity-controlled radiation therapy is a state-of-the-art radiation treatment that uses a computer-assisted reverse treatment plan to achieve the goal of minimizing radiation irradiation to surrounding normal tissues while delivering radiation distribution optimized for the treatment purpose to the treatment area. (Intensity Modulated Radiation Therapy, IMRT) method is gaining attention.

Intensity-controlled radiation therapy divides each radiation area into small pieces within a few millimeters in order to distribute radiation optimally for the treatment purpose, establishes a treatment plan that can deliver radiation of different intensities, and then uses a multi-leaf collimator, a radiation control device. This is a method of delivering planned radiation by precisely controlling it with a computer.

This intensity-controlled radiation therapy has the advantage of being able to treat cancer safely and effectively as it can focus radiation only on the tumor area while minimizing side effects on normal organs around the tumor.

Therefore, intensity-modulated radiation therapy is mainly used for head and neck tumors and prostate cancer, and its application area is expanding in various other areas.

Meanwhile, for sophisticated radiation treatments such as intensity-controlled radiation therapy, it is important to ensure that the planned radiation dose is accurately output.

Accordingly, a procedure to verify that the correct radiation dose is output must be performed before intensity-controlled radiation treatment for all patients.

Radiation dose measurement methods include a point source measurement method that measures absolute dose and a two-dimensional dose distribution measurement (relative dose measurement) method. Absolute dose measurement uses an ion chamber, and relative dose measurement uses a dedicated film or flat plate. This is done using a type detector, etc.

For these measurements, various types of measurement phantoms, such as phantoms for fixed irradiation and phantoms for rotating irradiation, are used.

However, when using various types of phantoms as described above depending on the measurement environment, not only is the measurement inconvenient, but multiple expensive phantoms must be purchased, which can be a burden in terms of cost.

Meanwhile, Patent Document 1 discloses a phantom for quality control of a linear accelerator for IMRT.

The phantom of Patent Document 1 is a cylindrical rotating irradiation phantom as shown in FIG. 1, and includes an ion chamber accommodating rod 39 into which the ion chamber is inserted, and a TLD accommodating thermoluminescent (TLD) chip inside. Equipped with a rod 41 and a fixed body 31 into which an X-ray film is inserted, absolute dose and relative dose distribution can be measured at once.

However, the phantom of Patent Document 1 is simply a cylindrical phantom for rotating irradiation equipped with devices that measure absolute dose and relative dose, and is used in various applications that require a phantom for fixed irradiation or a flat phantom, etc., rather than a phantom for rotating irradiation. It is difficult to respond to measurement situations. In particular, because film is used, a separate developing process is required, making real-time measurement impossible, and film is difficult to handle, requiring a high degree of skill.

Republic of Korea Patent Publication No. 2010-0111985

In order to solve the above problems, the present invention provides a multi-purpose phantom that can simultaneously measure absolute dose and relative dose in real time, and a rotating irradiation phantom module that is detachable from the multi-purpose phantom so that it can be modified into various forms depending on the measurement situation. The purpose is to provide a modular phantom that includes.

To achieve this purpose, the modular phantom according to the present invention can simultaneously measure the absolute dose and relative dose of radiation irradiated from a radiation therapy device, and can be modified and used in various forms depending on the measurement situation. As, the modular phantom is characterized in that it includes a multi-purpose phantom and a phantom module for rotational irradiation coupled to the upper and lower parts of the multi-purpose phantom.

In addition, the modular phantom according to the present invention is characterized in that it further includes a phantom support.

In addition, in the modular phantom according to the present invention, the multipurpose phantom includes a phantom body in the form of a rectangular parallelepiped and an ion chamber holder into which an ion chamber for measuring the absolute dose is inserted, and the phantom body is in the form of a flat plate for measuring the relative dose. It is characterized by comprising a flat detector insertion port into which the detector is inserted, an ion chamber holder insertion port into which the ion chamber holder is inserted, and one or more coupling grooves located at the upper and lower portions of the phantom body, respectively.

Additionally, in the modular phantom according to the present invention, the ion chamber holder is characterized in that it is detachable from the phantom body.

In addition, in the modular phantom according to the present invention, the ion chamber holder is characterized by including a holder main body and an ion chamber accommodating part located on one surface of the holder main body into which the ion chamber is inserted.

Additionally, in the modular phantom according to the present invention, the ion chamber accommodating part is characterized in that it has a shape corresponding to the shape of the ion chamber.

In addition, in the modular phantom according to the present invention, a portion of the holder body protrudes outside the ion chamber holder insertion hole when mounted on the phantom body, and the protruding portion makes it easy to mount or separate the ion chamber holder from the phantom body. It is characterized in that a groove is formed so as to do so.

Additionally, in the modular phantom according to the present invention, the groove portions are characterized in that they are formed in pairs on surfaces facing each other.

The modular phantom of the present invention has the advantage of being able to simultaneously measure the absolute dose and relative dose of radiation by being equipped with an ion chamber and a flat detector.

In addition, the modular phantom of the present invention has the advantage of being able to easily attach and detach a multipurpose phantom and a phantom module for rotational irradiation depending on the measurement situation.

Accordingly, the modular phantom of the present invention has the advantage of reducing phantom purchase costs by eliminating the need to have multiple expensive phantoms depending on the measurement situation.

In addition, the modular phantom of the present invention has the advantage that the ion chamber holder can be replaced, so even if the ion chamber has a different shape, it can be easily responded to by simply replacing the ion chamber holder.

Figure 1 is a perspective view showing a phantom for rotational irradiation according to a conventional embodiment.
Figure 2 is a front view showing a modular phantom according to an embodiment of the present invention.
Figure 3 is a perspective view showing a multi-purpose phantom according to an embodiment of the present invention.
Figure 4 is a front view showing a multi-purpose phantom with the ion chamber holder removed according to an embodiment of the present invention.
Figure 5 is a perspective view showing a multipurpose phantom and a flat detector and ion chamber inserted into the multipurpose phantom according to an embodiment of the present invention.
Figure 6 is a perspective view showing an ion chamber holder according to an embodiment of the present invention.
Figure 7 is a cross-sectional view showing an example of an ion chamber holder accommodating portion having a shape corresponding to the shape of the ion chamber according to an embodiment of the present invention.

Hereinafter, an embodiment in which the present invention can be easily implemented by a person skilled in the art will be described in detail.

If there is no other definition in the technical and scientific terms used in the present invention, they can be interpreted as having meanings commonly understood by those skilled in the art in the technical field to which this invention pertains.

Hereinafter, the modular phantom according to the present invention will be described in detail with reference to the attached drawings.

Figure 2 is a front view showing a modular phantom according to an embodiment of the present invention, Figure 3 is a perspective view showing a multi-purpose phantom according to an embodiment of the present invention, and Figure 4 is an ion chamber according to an embodiment of the present invention. It is a front view showing a multi-purpose phantom with the holder removed, and Figure 5 is a perspective view showing a multi-purpose phantom according to an embodiment of the present invention and a flat detector and ion chamber inserted into the multi-purpose phantom.

Looking at the modular phantom 1000 of the present invention with reference to FIGS. 2 to 5, the modular phantom 1000 according to the present invention includes a multipurpose phantom 100, a phantom module for rotational irradiation 200, and a phantom support ( 300).

Such a multi-purpose phantom 100 and a phantom module for rotational irradiation 200 can be formed using known materials for manufacturing phantoms, such as acrylic.

Here, the multipurpose phantom 100 includes a phantom body 110 and an ion chamber holder 120 in the form of a rectangular parallelepiped, as shown in FIGS. 3 to 5 .

Here, a flat detector insertion hole 111 into which the flat detector 400 is inserted and an ion chamber holder insertion hole 112 into which the ion chamber holder 112 is inserted are formed on one surface of the phantom body 110.

Meanwhile, in addition to the flat detector 400, film-type measuring means such as EBT film are used as a means of measuring the relative dose of radiation.

However, film-type measurement means require a process such as development or use a new film for each measurement, which can result in high costs, so it is recommended to use a flat detector 400 that can be easily measured and can be read immediately. It is desirable.

Therefore, the modular phantom 1000 including the multipurpose phantom 100 can simultaneously measure the absolute dose and relative dose of radiation.

In addition, coupling grooves 113 for coupling the phantom module 200 for rotational irradiation are formed on the upper and lower sides of the phantom body 110.

In response to this coupling groove 113, a coupling protrusion 210 is formed on one side of the rotational irradiation phantom module 200 to easily couple the multipurpose phantom 100 and the rotational irradiation phantom module 200, Allow it to be separated.

Meanwhile, in the above, a coupling groove 113 and a coupling protrusion 210 are described as means for coupling the multipurpose phantom 100 and the rotational irradiation phantom module 200, but the coupling groove 113 and the coupling protrusion 210 are not limited thereto, and the two phantoms can be easily combined. Various known means for combining and separating can be used.

The rotating irradiation phantom module 200 is coupled to the upper and lower parts of the multipurpose phantom 100 to form a modular phantom 1000.

As shown in FIG. 2, the shape of the phantom module 200 for rotational irradiation has a shape in which one end of a circular cross-section is cut. This is because the existing phantom for rotational irradiation has a cylindrical shape, so it can be used in the multipurpose phantom 100. This is to realize a shape similar to a cylindrical shape by combining the phantom module 200 for rotational irradiation.

In addition, although not shown in the present invention, a modular phantom 1000 that combines a fixed irradiation phantom module, etc. with the above multi-purpose phantom 100 can be used as needed, and the multi-purpose phantom 100 can also be used alone. .

As described above, the modular phantom 1000 of the present invention can be used by easily attaching and detaching a multi-purpose phantom and various types of phantom modules depending on the measurement situation, eliminating the need to have multiple expensive phantoms, thereby reducing phantom purchase costs. You may.

Meanwhile, as seen above, the modular phantom 1000 may be provided with a phantom support 300 at the bottom to prevent the modular phantom 1000 from moving depending on the shape of the phantom module coupled to the multi-purpose phantom 100. there is.

FIG. 6 is a perspective view showing an ion chamber holder according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing an example of an ion chamber holder receiving portion having a shape corresponding to the shape of the ion chamber according to an embodiment of the present invention.

Looking at the ion chamber holder 120 of the present invention in detail with reference to FIGS. 6 and 7, the ion chamber holder 120 of the present invention includes a holder body portion 121 and one surface of the holder body portion 121. It has an opening and includes an ion chamber receiving portion 122 and a groove portion 123 formed inside the holder body portion 121.

Here, the holder main body 121 is shown in the form of a long rectangular parallelepiped in FIG. 6.

The external shape of the holder main body 121 is not limited to this, and the cylinder may be in the form of a polygonal pillar.

However, considering that the holder body portion 121 is inserted into the ion chamber holder insertion hole 112 of the multipurpose phantom 100, it is preferable that the holder body portion 121 has a shape corresponding to the shape of the ion chamber holder insertion hole 112.

In addition, the holder main body 121 preferably has a size such that a portion of the holder body 121 protrudes out of the multi-purpose phantom 100 when inserted into the ion chamber holder insertion hole 112, as indicated by a dotted line in FIG. 6.

In this way, a part of the holder main body 121 protrudes outward, and a groove 123 in which a part of the holder main body 121 is recessed inward is formed on the protruding part, so that the measurer can use the ion chamber holder 120. It is easy to mount or detach from the multipurpose phantom 100.

It is preferable that a plurality of grooves 123 are formed on surfaces facing each other, and the depth of the grooves 123 is appropriately adjusted within a range that does not affect the rigidity of the holder body 121 and the ion chamber receiving portion 122. can be selected.

Additionally, unlike Figure 6 of the present invention, it is also possible to form it in a shape such as a protrusion rather than a groove 123.

The reason why the ion chamber holder 120 is provided in a detachable manner rather than fixed to the multipurpose phantom 100 as described above is that, as shown in FIG. 7, the shape of the ion chamber 500 that measures the absolute dose of radiation is diverse. Because it does.

In order to correspond to these various types of ion chamber 500, it is desirable for the ion chamber receiving portion 122 of the ion chamber holder 120 to have various shapes for the sake of measurement accuracy.

If the ion chamber holder 120 is fixed to the phantom, a problem may arise where the entire phantom needs to be changed to accommodate various types of ion chamber 500. However, in the present invention, an appropriate ion chamber holder 120 is used. This problem can be solved by installing it.

That is, the modular phantom 1000 of the present invention has the advantage that the ion chamber holder 120 can be easily replaced, so there is no need to change the entire phantom.

By simply and quickly measuring radiation dose using the modular phantom 1000 of the present invention as described above, the preparation process for radiation therapy can be shortened.

A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. In this regard, the above-described examples and experimental examples are illustrative in all respects and should be considered from an explanatory rather than a limiting perspective.

1000: Modular Phantom
100: Multi-purpose phantom
110: Phantom body
111: Flat detector insertion hole
112: Ion chamber holder insertion hole
113: Coupling groove
120: Ion chamber holder
121: Holder main body
122: Ion chamber receiving part
123: Home Department
200: Phantom module for rotational irradiation
210: combined protrusion
300: Phantom support
400: Flat detector
500: Ion chamber

Claims (8)

It is a modular phantom that can simultaneously measure the absolute dose and relative dose of radiation irradiated from a radiation therapy device and can be modified and used in various forms depending on the measurement situation.
The modular phantom is a modular phantom comprising a multi-purpose phantom and a phantom module for rotational irradiation coupled to the upper and lower parts of the multi-purpose phantom.
The modular phantom of claim 1, wherein the modular phantom further includes a phantom support.
According to paragraph 1,
The multipurpose phantom includes a phantom body in the form of a rectangular parallelepiped; and
It includes an ion chamber holder into which an ion chamber for measuring the absolute dose is inserted,
The phantom body includes a flat detector insertion port into which a flat detector for measuring the relative dose is inserted;
an ion chamber holder insertion port into which the ion chamber holder is inserted; and
A modular phantom comprising: one or more coupling grooves located on the upper and lower portions of the phantom body, respectively.
The modular phantom of claim 3, wherein the ion chamber holder is detachable from the phantom body.
The modular phantom of claim 4, wherein the ion chamber holder includes a holder main body and an ion chamber accommodating part located on one surface of the holder main body into which the ion chamber is inserted.
The modular phantom of claim 5, wherein the ion chamber accommodating portion has a shape corresponding to the shape of the ion chamber.
The method of claim 6, wherein a portion of the holder body protrudes outside the ion chamber holder insertion hole when mounted on the phantom body, and a groove is formed on the protruding portion to facilitate mounting or separation of the ion chamber holder from the phantom body. A modular phantom characterized by:
The modular phantom according to claim 7, wherein the grooves are formed in pairs on surfaces facing each other.