Applicator dose distribution measurement device and measurement method

Abstract

The present application discloses a device and method for measuring the dose distribution of an applicator, and relates to the technical field of radiotherapy equipment. The device for measuring the dose distribution of an applicator includes a fixed module and a radiation-sensitive film; a hollow groove is provided in the middle of the fixed module, and the opening of the hollow groove faces upward; the radiation-sensitive film is arranged in the fixed module, and a notch portion corresponding to the hollow groove is provided on the radiation-sensitive film, and the opening side of the notch portion is in the same direction as the opening of the hollow groove, and the hollow groove and the notch portion together form a receiving cavity for accommodating the applicator to be measured; wherein, the shape of the notch portion is adapted to the cross-sectional shape of the hollow groove along the length direction, and the wall surface of the notch portion is tangent to the inner wall surface of the hollow groove. The device for measuring the dose distribution of an applicator disclosed in the present application solves the limitations of the existing three-dimensional water tank test, and has a fast measurement speed and high efficiency. The measurement of dose distribution is realized more directly and more completely. It is simpler in structure and more convenient to operate.

Description

Technical Field

[0001] The present application relates to the technical field of radiotherapy equipment, and in particular, to a device and method for measuring dose distribution of a treatment device. Background Art

[0002] In the radiotherapy of tumors, in order to confirm the energy and shape of the radiation beams used in the treatment, such as X-rays, electron beams, proton beams, neutron beams, etc., it is necessary to measure the dose distribution before irradiating the patient. In order to adjust the radiation device and confirm the different energy distribution and shape of the radiation beam for each patient, it is necessary to perform dose distribution measurement on a daily basis as a quality management of the radiation beam. The existing testing method usually adopts a three-dimensional water tank test, but the three-dimensional water tank test requires multiple sets of probes for multiple measurements, which is slow, inefficient, has low spatial resolution, and is complex to operate. Summary of the invention

[0003] The purpose of the present application is to provide a device and method for measuring dose distribution of a treatment device, so as to solve the deficiencies existing in the prior art.

[0004] To achieve the above objectives, in a first aspect, the present application provides a device for measuring dose distribution of a treatment device, comprising:

[0005] A fixed module having a hollow groove in the middle, the opening of the hollow groove facing upward; and

[0006] A radiation-sensitive film is arranged in the fixed module, the radiation-sensitive film is provided with a notch portion corresponding to the hollow groove, the opening side of the notch portion is in the same direction as the opening of the hollow groove, and the hollow groove and the notch portion together form a receiving cavity for receiving the applicator to be measured;

[0007] The shape of the notch portion is adapted to the cross-sectional shape of the hollow groove along the length direction, and the wall surface of the notch portion is tangent to the inner wall surface of the hollow groove.

[0008] As a further improvement of the above technical solution:

[0009] In combination with the first aspect, in a possible implementation, the fixed module includes two mutually spliced ​​mold bodies, and the sides of the two mold bodies close to each other are each provided with a sub-groove constituting the hollow groove, and the radiation sensitive film is located between the two mold bodies.

[0010] In combination with the first aspect, in a possible implementation manner, the two mold bodies are detachably connected.

[0011] In combination with the first aspect, in a possible implementation manner, the two mold bodies are connected by screws, bolts or snap connections.

[0012] In combination with the first aspect, in a possible implementation manner, the mold body is a semi-cylindrical structure.

[0013] In combination with the first aspect, in a possible implementation manner, the side surfaces of the two mold bodies that are close to each other are respectively in contact with the radiation-sensitive film to clamp the radiation-sensitive film.

[0014] In combination with the first aspect, in a possible implementation manner, the fixing module is made of a water equivalent material.

[0015] To achieve the above purpose, in a second aspect, the present application further provides a method for measuring dose distribution of a treatment device, based on the device for measuring dose distribution of a treatment device provided in the first aspect, the method for measuring dose distribution of a treatment device comprises:

[0016] Prepare a dose distribution measurement device for an applicator, and place the applicator in the accommodating cavity;

[0017] Starting the applicator to irradiate;

[0018] After one irradiation is completed, the radiation-sensitive film is taken out for scanning to obtain the grayscale value of the radiation-sensitive film;

[0019] The current dose distribution of the applicator is determined according to the grayscale value.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present application provides a device and method for measuring the dose distribution of an applicator, wherein the device for measuring the dose distribution of an applicator forms a receiving cavity for accommodating the applicator to be measured through the notch of the radiation-sensitive film and the hollow groove in the middle of the fixed module. During measurement, the radiation dose generated by the applicator when radiating is irradiated in a direction parallel to the surface of the radiation-sensitive film, and then the radiation-sensitive film is used to truly reflect the absorbed radiation dose by using the high spatial resolution and tissue equivalence characteristics; then the dose distribution of the applicator is indirectly obtained by scanning the grayscale value of the radiation-sensitive film. The device for measuring the dose distribution of an applicator provided by the present application solves the limitations of the existing three-dimensional water tank test, and has a fast measurement speed and high efficiency. The measurement of dose distribution is more direct and complete. It is simpler in structure and more convenient to operate.

[0022] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a device for measuring dose distribution of a treatment device provided in an embodiment of the present application is shown;

[0025] Figure 2 Shows Figure 1 A schematic diagram of the state when the applicator is inserted into the applicator dose distribution measurement device shown;

[0026] Figure 3 Shows Figure 2 An exploded schematic diagram of a device for measuring dose distribution of an applicator is shown;

[0027] Figure 4 A schematic diagram of the three-dimensional structure of a radiation-sensitive film in a device for measuring dose distribution of a treatment device provided in an embodiment of the present application is shown;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of a phantom in the device for measuring dose distribution of an applicator provided in an embodiment of the present application is shown.

[0029] Description of reference numerals:

[0030] 10. Applicator; 11. Head;

[0031] 100, fixed module; 101, hollow groove; 101a, sub-groove; 110, accommodating cavity; 120, mold body; 121, threaded hole;

[0032] 200. Radiation-sensitive film; 210. Notch portion. DETAILED DESCRIPTION

[0033] The specific implementation of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present application, and is not used to limit the embodiment of the present application.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0035] In the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0039] Example

[0040] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides a device for measuring dose distribution of a tumor applicator, which can be used to measure the dose distribution of a tumor applicator 10. The applicator 10 can emit radiation beams, such as X-rays and particle beams such as electron beams, proton beams, and neutron beams.

[0041] The device for measuring the dose distribution of the treatment device comprises a fixed module 100 and a radiation sensitive film 200. A hollow groove 101 is provided in the middle of the fixed module 100, and the opening of the hollow groove 101 faces upward (see Figure 1 and Figure 5). The radiation-sensitive film 200 is disposed in the fixed module 100. The radiation-sensitive film 200 is provided with a notch portion 210 corresponding to the hollow groove 101. The opening of the notch portion 210 is oriented in the same direction as the opening of the hollow groove 101. The hollow groove 101 and the notch portion 210 together form a receiving cavity 110 for receiving the applicator 10 to be measured. In this embodiment, the receiving cavity 110 is adapted to the applicator 10.

[0042] Furthermore, the shape of the notch 210 is adapted to the cross-sectional shape of the hollow groove 101 along the length direction, and the wall surface of the notch 210 is tangent to the inner wall surface of the hollow groove 101. In other words, the wall surface of the notch 210 and the inner wall surface of the hollow groove 101 together form the inner wall of the accommodating cavity 110, and because the wall surface of the notch 210 is tangent to the inner wall surface of the hollow groove 101, the inner wall of the accommodating cavity 110 is a smooth curved surface.

[0043] When measuring, first prepare the dose distribution measuring device for the applicator, and place the applicator 10 in the accommodating cavity 110 so that the applicator 10 is in contact with the inner wall of the accommodating cavity. Then, the applicator 10 is powered on, and the applicator 10 emits a light beam for irradiation. Thus, after one irradiation, the radiation-sensitive film 200 is taken out for scanning to obtain the grayscale value of the radiation-sensitive film 200. Finally, the current dose distribution of the applicator 10 can be determined according to the grayscale value, thereby completing the measurement.

[0044] It should be noted that the dose distribution measuring device for the applicator provided in this embodiment forms a receiving cavity 110 for accommodating the applicator 10 to be measured through the notch 210 of the radiation-sensitive film 200 and the hollow groove 101 in the middle of the fixed module 100. During measurement, the radiation dose generated by the applicator 10 when radiating is irradiated in a direction parallel to the surface of the radiation-sensitive film 200, and then the radiation-sensitive film 200 is used to truly reflect the absorbed radiation dose by using the high spatial resolution and tissue equivalence characteristics; then, the dose distribution of the applicator 10 is indirectly obtained by scanning the grayscale value of the radiation-sensitive film 200. The dose distribution measuring device for the applicator provided in this embodiment solves the limitations of the existing three-dimensional water tank test, and has a fast measurement speed and high efficiency. The measurement of dose distribution is more direct and complete. It is simpler in structure and more convenient to operate.

[0045] In addition, the dose distribution measurement device for the applicator provided in this embodiment is also applicable to the light-limiting tube, which can realize the rapid measurement of the light-limiting tube and avoid excessive radiation.

[0046] In some embodiments, the head 11 of the applicator 10 may be a column, a sphere, or a spherical segment of a regular shape. In this case, the fixed module 100 may be provided as an integral component, and the applicator 10 may be inserted or pulled out from the opening of the hollow groove 101. In order to facilitate the installation of the radiation-sensitive film 200 on the fixed module 100, an installation slot for inserting the radiation-sensitive film 200 may be further provided on the upper end surface of the fixed module 100 where the opening of the hollow groove 101 is provided. The width and depth of the installation slot are both greater than the hollow groove 101. The radiation-sensitive film 200 may be inserted into the installation slot, so that the notch 210 of the radiation-sensitive film 200 and the hollow groove 101 together form the accommodating cavity 110, and the radiation-sensitive film 200 may be directly pulled out after the measurement is completed.

[0047] Furthermore, the accommodating cavity 110 is a rotational columnar cavity structure, and the width direction of the installation slot passes through the axis of the accommodating cavity 110 .

[0048] Please also read Figure 5 In this embodiment, considering that the shape of the head 11 of the applicator 10 is relatively complex, it is not possible to directly install it in the accommodating cavity 110 of the fixed module 100 by plugging and unplugging. Therefore, in this embodiment, the fixed module 100 includes two mutually spliced ​​mold bodies 120, and the two mold bodies 120 are provided with sub-grooves 101a constituting the hollow groove 101 on the sides close to each other, and the radiation-sensitive film 200 is located between the two mold bodies 120.

[0049] It can be understood that when the two molds 120 are spliced ​​together, the two sub-grooves 101a are close to each other to form the hollow groove 101, and at the same time, the radiation-sensitive film 200 is located between the two molds 120. The radiation-sensitive film 200 is clamped and fixed by the two molds 120, so the radiation-sensitive film 200 and the hollow groove 101 formed by the two sub-grooves 101a are formed together.

[0050] Furthermore, the two mold bodies 120 are detachably connected to facilitate installation and removal. When in use, one of the mold bodies 120 is first fitted to the applicator 10, and then the radiation-sensitive film 200 is placed on the mold body 120, and finally the other mold body 120 is covered and the two mold bodies 120 are connected and fixed.

[0051] In some embodiments, the two mold bodies 120 are connected by screws. Specifically, a threaded hole 121 is provided on one side of one mold body 120 close to the other mold body 120, and a through hole is provided on the other mold body 120. The screw passes through the through hole and is threadedly matched with the corresponding threaded hole 121 to achieve the connection between the two mold bodies 120.

[0052] In other embodiments, the two mold bodies 120 are connected by bolts. Specifically, through holes are provided on the two mold bodies 120, and bolts are passed through the through holes of the two mold bodies 120 in sequence, and then washers and nuts are installed at the ends of the bolts to achieve the connection of the two mold bodies 120.

[0053] In some other embodiments, the two mold bodies 120 are connected by snapping. Specifically, a slot is provided on one of the mold bodies 120, and a buckle is provided on the other mold body 120, and the two mold bodies 120 are connected by snapping the buckle with the slot. Of course, an external strap or clamp can be directly used to surround the outer circumference of the two mold bodies 120 to make the two mold bodies 120 fit each other.

[0054] In this embodiment, the fixed module 100 is a columnar structure, and the two mold bodies 120 are of the same structure, both of which are semi-cylindrical structures. The side surfaces of the two mold bodies 120 that are close to each other are respectively in contact with the radiation-sensitive film 200 to clamp the radiation-sensitive film 200 .

[0055] Optionally, the fixing module 100 is made of water equivalent material. It can be understood that the distribution of the radiation dose emitted by the applicator 10 in the human body is similar to that in water, so the use of water equivalent material can truly simulate the dose distribution in the human body, thereby improving the measurement accuracy.

[0056] Optionally, the radiation-sensitive film 200 is a radiochromic film. The radiochromic film is used for the measurement of radiation dose. The radiochromic film has excellent spatial resolution (reaching at least 0.001 mm); another advantage is that it has tissue equivalence and can truly reflect the dose adsorbed by the tissue.

[0057] See also Figures 1 to 5 Furthermore, this embodiment also provides a method for measuring the dose distribution of an applicator, based on the device for measuring the dose distribution of an applicator provided above.

[0058] The method for measuring the dose distribution of the applicator includes:

[0059] S100 : Prepare a device for measuring the dose distribution of an applicator, and place the applicator 10 in the accommodating chamber 110 .

[0060] S200: Start the treatment device 10 to perform irradiation.

[0061] S300: After one irradiation, the radiation-sensitive film 200 is taken out for scanning to obtain the grayscale value of the radiation-sensitive film 200. The radiation-sensitive film 200 is scanned using a dedicated scanner.

[0062] S400: Determine the current dose distribution of the applicator 10 according to the grayscale value.

[0063] Compared with the prior art, the device for measuring the dose distribution of the applicator provided in this embodiment solves the limitation of the existing three-dimensional water tank test, has a fast measurement speed and high efficiency, and can achieve more direct and complete measurement of dose distribution. It is simpler in structure and more convenient to operate.

[0064] The radiation-sensitive film changes its light transmittance and optical density in proportion to the radiation dose, allowing the radiation dose to be measured indirectly by detecting its light transmittance and optical density. Compared with traditional probes, radiation-sensitive films have higher spatial resolution, do not require multiple groups of multiple measurements to measure distribution, and are suitable for measuring irregularly shaped dose distributions.

[0065] The above describes in detail the optional implementation methods of the embodiments of the present application in combination with the accompanying drawings. However, the embodiments of the present application are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present application, various simple modifications can be made to the technical scheme of the embodiments of the present application, and these simple modifications all belong to the protection scope of the embodiments of the present application.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present application will not further describe various possible combinations.

[0067] In addition, the various implementation methods of the embodiments of the present application may be arbitrarily combined, and as long as they do not violate the ideas of the embodiments of the present application, they should also be regarded as the contents disclosed in the embodiments of the present application.

Claims

1. A device for measuring dose distribution of a treatment device, characterized in that: include: A fixed module (100) is provided with a hollow groove (101) in the middle, and the opening of the hollow groove (101) faces upward; and A radiation-sensitive film (200) is arranged in the fixed module (100); a notch portion (210) corresponding to the hollow groove (101) is provided on the radiation-sensitive film (200); an opening side of the notch portion (210) is in the same direction as the opening of the hollow groove (101); the hollow groove (101) and the notch portion (210) together form a receiving cavity (110) for receiving the applicator (10) to be measured; The shape of the notch portion (210) is adapted to the cross-sectional shape of the hollow groove (101) along the length direction, and the wall surface of the notch portion (210) is tangent to the inner wall surface of the hollow groove (101); The fixed module (100) comprises two mutually spliced ​​modules (120), the two modules (120) are detachably connected, and the two modules (120) are provided with sub-grooves (101a) constituting the hollow groove (101) on the sides close to each other, and the radiation-sensitive film (200) is located between the two modules (120); The side surfaces of the two mold bodies (120) that are close to each other are respectively in contact with the radiation-sensitive film (200) to clamp the radiation-sensitive film (200); The mold body (120) is a semi-cylindrical structure.

2. The device for measuring dose distribution of a treatment device according to claim 1, characterized in that: The two mold bodies (120) are connected by screws, bolts or clamping.

3. The device for measuring dose distribution of an applicator according to any one of claims 1 to 2, characterized in that: The fixed module (100) is made of water equivalent material.

4. A method for measuring dose distribution of an applicator, characterized in that: Based on the device for measuring dose distribution of an applicator according to any one of claims 1 to 3, the method for measuring dose distribution of an applicator comprises: Preparing a device for measuring the dose distribution of a treatment device, and placing the treatment device (10) in the accommodation chamber (110); Starting the applicator (10) to perform irradiation; After one irradiation is completed, the radiation-sensitive film (200) is taken out for scanning to obtain the grayscale value of the radiation-sensitive film (200); The current dose distribution of the applicator (10) is determined according to the grayscale value.

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