Surface dose testing device and testing method for applicator

Abstract

The present application discloses a surface dose test device and a test method for an applicator, and relates to the technical field of radiotherapy equipment. The surface dose test device for an applicator includes a fixing component, a radiation detector, and a radiation-sensitive film; the fixing component is provided with a first receiving groove and a second receiving groove that are connected. The fixing component is also provided with a third receiving groove and a first opening connected to the first receiving groove and a second opening connected to the third receiving groove, and the first receiving groove is used to accommodate the head of the applicator to be tested; the radiation detector is inserted into the third receiving groove, and is used to measure the dose value of the applicator; the radiation-sensitive film is provided in the second receiving groove, and the upper surface of the radiation-sensitive film is in contact with the head. The surface dose test device for an applicator provided by the present application has a simple structure, a simple test method, and can accurately calculate the surface dose of the applicator, and has high measurement accuracy.

Description

Technical Field

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

[0002] In the radiation therapy of tumors, in order to confirm the energy and shape of the radiation beams such as X-rays, electron beams, and particle beams used in the treatment, it is necessary to measure the dose distribution before irradiating the beams to the patient. The traditional ionization chamber probe is limited by its volume and has low spatial resolution, and cannot directly measure the dose on the surface of the applicator. However, radiation-sensitive film is a convenient tool for dose measurement and radiotherapy plan verification with excellent spatial resolution. Summary of the invention

[0003] The purpose of the present application is to provide a surface dose testing device and a testing method for an applicator, 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 surface dose testing device for a treatment device, comprising:

[0005] A fixing assembly, wherein a first accommodating groove and a second accommodating groove are provided in a vertical direction and are connected in sequence, wherein the fixing assembly is provided with a third accommodating groove, a first opening and a second opening, wherein the first opening is connected to the first accommodating groove, and the second opening is connected to the third accommodating groove, and the first accommodating groove is used to accommodate the head of the applicator to be tested;

[0006] a radiation detector, inserted into the third receiving groove along the second opening, the radiation detector being used to measure a dose value at a preset distance from the head; and

[0007] A radiation-sensitive film is disposed on the fixing assembly and located in the second containing groove, and an upper surface of the radiation-sensitive film abuts against the head.

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

[0009] In combination with the first aspect, in a possible implementation, the fixing assembly includes a first fixing member and a second fixing member, the first fixing member and the second fixing member are detachably connected, and the first accommodating groove and the second accommodating groove are formed between the first fixing member and the second fixing member.

[0010] In combination with the first aspect, in a possible implementation manner, the fixing component is made of a water-equivalent material.

[0011] In combination with the first aspect, in a possible implementation manner, a shape of the first receiving groove is adapted to a shape of the head of the applicator.

[0012] In combination with the first aspect, in a possible implementation manner, the first receiving groove has a shape of a sphere, a hemisphere, an ellipsoid, a cylinder or a spherical segment.

[0013] In combination with the first aspect, in a possible implementation, a side wall of the second accommodating groove is provided with a card slot recessed into the wall body of the fixing assembly, and a side edge of the radiation-sensitive film is provided with a card connection portion adapted to the card slot.

[0014] In combination with the first aspect, in a possible implementation, the surface dose testing device of the applicator further includes a support base, the support base is disposed on the fixing assembly, and the radiation detector is disposed on the support base.

[0015] In combination with the first aspect, in a possible implementation manner, the support base is detachably inserted into the second opening, and the support base is provided with an axial hole for inserting the radiation detector, and the axial hole is aligned with the second opening.

[0016] In combination with the first aspect, in a possible implementation manner, the support seat is detachably connected to the fixing assembly.

[0017] To achieve the above-mentioned purpose, in a second aspect, the present application further provides a surface dose testing method for a treatment device, based on the surface dose testing device for a treatment device provided according to the first aspect, the surface dose testing method for a treatment device comprises:

[0018] Prepare a surface dose test device for the applicator, and install the head of the applicator into the first receiving groove;

[0019] Conducting a test to record the dose value of the radiation detector and the grayscale value of the radiation-sensitive film;

[0020] Converting the grayscale value into a surface dose value, and calculating the ratio of the dose value to the surface dose of the applicator according to the dose value and the surface dose value obtained by converting the grayscale value;

[0021] Based on the ratio, the surface dose of the applicator is calculated according to the dose value of the radiation detector without the need for the radiation sensitive film.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present application provides a surface dose testing device and a testing method for an applicator, wherein the surface dose testing device for the applicator installs the head of the applicator through a first receiving groove in a fixing assembly, a radiation detector is inserted into a third receiving groove along a second opening, a radiation sensitive film is installed through the second receiving groove, and the upper surface of the radiation sensitive film abuts the head.

[0024] During the test, the radiation detector measures the dose value at a preset distance from the head of the applicator, and then scans the grayscale on the radiation-sensitive film, converts the grayscale value into a surface dose value, and calculates the ratio of the dose value to the surface dose of the applicator based on the dose value and the surface dose value obtained by converting the grayscale value; based on the ratio, the surface dose of the applicator is calculated based on the dose value of the radiation detector and the dose value without the need for the radiation-sensitive film. The surface dose test device for the applicator provided by the present application has a simple structure, a simple test method, and can accurately calculate the surface dose of the applicator with high measurement accuracy.

[0025] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 A schematic diagram of the three-dimensional structure of a surface dose testing device for a treatment device provided in an embodiment of the present application is shown;

[0028] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the first fixing member in the surface dose testing device of the applicator shown;

[0029] Figure 3 Shows Figure 1 A schematic diagram of a three-dimensional structure of an applicator installed in a surface dose testing device of the applicator is shown;

[0030] Figure 4 Shows Figure 3 Schematic diagram of an exploded view of the surface dose testing device of the applicator shown.

[0031] Description of reference numerals:

[0032] 10. Applicator; 11. Head;

[0033] 100, fixing assembly; 101, first receiving groove; 102, second receiving groove; 103, third receiving groove; 104, first opening; 105, second opening; 110, first fixing member; 111, threaded hole; 120, second fixing member;

[0034] 200. Radiation detector;

[0035] 300. Radiation-sensitive films;

[0036] 400. Support seat. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0043] Example

[0044] See also Figures 1 to 4 This embodiment provides a surface dose testing device for a treatment device, which can be used to test the surface dose of treatment devices 10 of different specifications and tumors, thereby adapting to different types of radiation beams, such as X-rays, electron beams, particle beams, etc.

[0045] See also Figure 1 and Figure 2 The surface dose testing device of the applicator includes a fixing assembly 100, a radiation detector 200 and a radiation sensitive film 300. The fixing assembly 100 is provided with a first accommodating groove 101 and a second accommodating groove 102 which are connected in sequence in the vertical direction. The fixing assembly 100 is also provided with a third accommodating groove 103, a first opening 104 and a second opening 105. The first opening 104 is connected to the first accommodating groove 101, and the second opening 105 is connected to the third accommodating groove 103. The first accommodating groove 101 is used to accommodate the head 11 of the applicator 10 to be tested.

[0046] Please also read Figure 3 and Figure 4 The radiation detector 200 is inserted into the third receiving groove 103 along the second opening 105, and the radiation detector 200 is used to measure the dose value of the applicator 10. The radiation sensitive film 300 is arranged in the fixing assembly 100 and located in the second receiving groove 102, and the upper surface of the radiation sensitive film 300 is in contact with the head 11.

[0047] In this embodiment, the third receiving groove 103 is located below the second receiving groove 102. The fixing assembly 100 includes a first fixing member 110 and a second fixing member 120, the first fixing member 110 and the second fixing member 120 are detachably connected, and the first receiving groove 101, the second receiving groove 102 and the third receiving groove 103 are formed between the first fixing member 110 and the second fixing member 120.

[0048] In this embodiment, the fixing assembly 100 is a columnar structure, wherein the first fixing member 110 and the second fixing member 120 are assembled to form the fixing assembly 100 of the columnar structure. Optionally, the first fixing member 110 and the second fixing member 120 are semi-cylindrical structures.

[0049] Furthermore, the first fixing member 110 and the second fixing member 120 are connected by screws, bolts or clamps. In this embodiment, the first fixing member 110 and the second fixing member 120 are connected by screws, wherein a plurality of threaded holes 111 are provided on one side of the first fixing member 110 close to the second fixing member 120 (see Figure 2), a plurality of threaded holes 111 are distributed on both sides of the axis of the first fixing member 110. The second fixing member 120 is provided with through holes corresponding to the threaded holes 111 along the thickness direction. During assembly, screws are inserted from the corresponding through holes and threadably engaged with the corresponding threaded holes 111 to assemble the first fixing member 110 and the second fixing member 120 together.

[0050] It should be noted that the head 11 of the applicator 10 is inserted into the first receiving groove 101 when the first fixing member 110 and the second fixing member 120 are assembled, and the first receiving groove 101 can realize the positioning and fixing of the head 11 of the applicator 10 .

[0051] Optionally, the second opening 105 is disposed on the first fixing member 110 or the second fixing member 120 .

[0052] Optionally, the fixing assembly 100 is made of a water-equivalent material. It is understandable that the distribution of the dose emitted by the head 11 of the applicator 10 in the human body is similar to that in water, so the use of water-equivalent materials can truly simulate the dose distribution in the human body, thereby improving the measurement accuracy.

[0053] In this embodiment, the shape of the first receiving groove 101 is adapted to the shape of the head 11 of the applicator, and the shape of the third receiving groove 103 is adapted to the shape of the radiation detector 200 .

[0054] Optionally, the shapes of the first receiving groove 101 and the third receiving groove 103 can be spherical, hemispherical, ellipsoidal, cylindrical or spherical. Of course, in some embodiments, the shapes of the first receiving groove 101 and the third receiving groove 103 can also be other shapes.

[0055] Optionally, the side wall of the second receiving groove 102 is provided with a slot recessed into the wall of the fixing assembly 100 , and the side edge of the radiation sensitive film 300 is provided with a snap-fitting portion adapted to the slot. Thus, the radiation sensitive film 300 is snapped into the slot of the second receiving groove 102 .

[0056] The surface dose testing device of the applicator further includes a support seat 400, which is disposed on the fixing assembly 100, and the radiation detector 200 is disposed on the support seat 400. Specifically, the support seat 400 is detachably inserted into the second opening 105, and the support seat 400 is provided with an axial hole (not shown) for inserting the radiation detector 200, and the axial hole is aligned with the second opening 105. The support seat 400 can be used to fix the radiation detector 200 to prevent damage to the radiation detector 200.

[0057] In this example, the support base 400 is detachably connected to the fixing assembly 100. The detachable connection method may be threaded connection, plug connection or flange bolt connection.

[0058] See also Figures 1 to 4 Furthermore, this embodiment also provides a surface dose testing method for a treatment device, based on the surface dose testing device for a treatment device provided above. The surface dose testing method for a treatment device includes the following steps:

[0059] S100 : preparing a surface dose testing device for the applicator, and installing the head 11 of the applicator 10 into the first receiving groove 101 .

[0060] Specifically, when assembling the first fixing member 110 and the second fixing member 120, the head 11 of the applicator 10 is installed in the first receiving groove 101, and the radiation sensitive film 300 is installed at the same time, and then the first fixing member 110 and the second fixing member 120 are fixed by screws.

[0061] S200: Conducting a test to record the dose value of the radiation detector (200) and the grayscale value of the scanned radiation sensitive film 300.

[0062] The radiation sensitive film 300 is scanned by an external scanner to obtain the grayscale value of the radiation sensitive film 300. The radiation detector 200 is used to measure the dose value at a preset distance from the surface of the head 11 of the applicator 10;

[0063] S300: Convert the grayscale value into a surface dose value, and calculate the ratio of the dose value to the surface dose of the applicator 10 according to the dose value and the surface dose value obtained by converting the grayscale value.

[0064] It should be noted that the grayscale value and the surface dose value of the radiation-sensitive film 300 can be obtained by film calibration. Usually, the radiation-sensitive film 300 needs to be calibrated before use.

[0065] The actual (radiation-sensitive film 300) dose value and the ionization chamber measured value are in a fixed ratio, that is, assuming that the grayscale value is 5000 and the radiation-sensitive film 300 dose value is 3 Gy, while the radiation detector 200 measures 1.5 Gy, then the ratio is 2.

[0066] The above measured multiple groups of data are averaged. Generally, in the area of ​​use, such as the electron energy emitted by the head 11 is 9MeV, and the dose rate is 4Gy / min, the ratio of the dose value of the radiation sensitive film 300 and the electron dose of the radiation detector 200 is obtained;

[0067] S400: According to the ratio, without the radiation sensitive film 300, according to the dose value of the radiation detector 200 and according to the dose value, the surface dose of the applicator 10 is calculated.

[0068] For example, if the dose value measured by the radiation detector 200 is 3 Gy, it can be known that the actual surface dose of the head 11 of the applicator 10 is 6 Gy.

[0069] Compared with the prior art, the surface dose testing device for the applicator provided in this embodiment has a simple structure, a simple testing method, and can accurately calculate the surface dose of the applicator with high measurement accuracy.

[0070] The radiation-sensitive film 300 changes its light transmittance and light density in proportion to the radiation dose, allowing the radiation dose to be indirectly measured by detecting its light transmittance and light density. Compared with conventional probes, the radiation-sensitive film 300 has a higher spatial resolution, does not require multiple sets of multiple measurements to measure the distribution, and is suitable for measuring dose distributions of irregular shapes. In addition, the radiation-sensitive film 300 has the characteristics of thin thickness and high spatial resolution, and can directly measure the surface dose of the applicator 10.

[0071] 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.

[0072] 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.

[0073] 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 surface dose testing method for an applicator, characterized in that: A surface dose testing device based on an applicator, the surface dose testing device of the applicator comprising: A fixing assembly (100) is provided with a first accommodating groove (101) and a second accommodating groove (102) which are connected in sequence in a vertical direction; the fixing assembly (100) is also provided with a third accommodating groove (103), a first opening (104) and a second opening (105); the first opening (104) is connected to the first accommodating groove (101); the second opening (105) is connected to the third accommodating groove (103); the first accommodating groove (101) is used to accommodate a head (11) of an applicator (10) to be tested; a radiation detector (200), inserted into the third receiving groove (103) along the second opening (105), the radiation detector (200) being used to measure a dose value at a preset distance from the surface of the head (11); and A radiation-sensitive film (300) is arranged on the fixing assembly (100) and is located in the second containing groove (102), wherein the upper surface of the radiation-sensitive film (300) is in contact with the head (11); The surface dose testing method of the applicator includes: Preparing a surface dose testing device for the applicator, and installing the head (11) of the applicator (10) into the first receiving groove (101); Conducting a test to record the dose value of the radiation detector (200) and the grayscale value of scanning the radiation-sensitive film (300); Converting the grayscale value into a surface dose value, and calculating the ratio of the dose value to the surface dose of the applicator (10) based on the dose value and the surface dose value obtained by converting the grayscale value; According to the ratio, the surface dose of the applicator (10) is calculated based on the dose value of the radiation detector (200) without the need for the radiation sensitive film (300).

2. The surface dose testing method of the applicator according to claim 1, characterized in that: The fixing assembly (100) comprises a first fixing member (110) and a second fixing member (120), wherein the first fixing member (110) and the second fixing member (120) are detachably connected, and the first accommodating groove (101) and the second accommodating groove (102) are formed between the first fixing member (110) and the second fixing member (120).

3. The surface dose testing method of the applicator according to claim 1 or 2, characterized in that: The fixing component (100) is made of a water-equivalent material.

4. The surface dose testing method of the applicator according to claim 1, characterized in that: The shape of the first accommodating groove (101) is adapted to the shape of the head (11) of the applicator (10).

5. The surface dose testing method of the applicator according to claim 1, characterized in that: The shape of the first containing groove (101) is spherical, hemispherical, ellipsoidal, cylindrical or spherical segment.

6. The surface dose testing method of the applicator according to claim 1, characterized in that: The side wall of the second accommodating groove (102) is provided with a clamping groove recessed into the wall body of the fixing assembly (100), and the side edge of the radiation-sensitive film (300) is provided with a clamping portion adapted to the clamping groove.

7. The surface dose testing method of the applicator according to claim 1, characterized in that: The surface dose testing device of the applicator further comprises a support base (400), wherein the support base (400) is arranged on the fixing assembly (100), and the radiation detector (200) is arranged on the support base (400).

8. The surface dose testing method of the applicator according to claim 7, characterized in that: The support base (400) is detachably inserted into the second opening (105); the support base (400) is provided with an axial hole for inserting the radiation detector (200); the axial hole is aligned with the second opening (105).

9. The surface dose testing method of the applicator according to claim 7, characterized in that: The support seat (400) is detachably connected to the fixing assembly (100).

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