Human body simulation die body for radiotherapy quality control and verification

Abstract

The utility model discloses a human body simulation die body for radiotherapy quality control and verification, which comprises a plurality of parts combined through tenon structures or connecting pieces, and the plurality of parts of the human body simulation die body comprise a first die body, a second die body, a third die body and a fourth die body which are connected in sequence, the adjacent two of the first mold body, the second mold body, the third mold body and the fourth mold body are connected through the tenon structures or the connecting pieces. According to the multifunctional combined die body, the replacement frequency of the die body is reduced, and the operation process is simplified, so that the quality control working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of radiotherapy technology, and in particular to a human body simulation model for radiotherapy quality control and verification. Background Technology

[0002] Radiation therapy is a crucial treatment for cancer, requiring most cancer patients at multiple stages of their treatment. Approximately half of all cancers can be cured with radiation therapy. With advancements in precision radiotherapy technology, its application in tumor treatment has expanded significantly, now permeating the entire treatment process. During radiotherapy, the linear accelerator serves as the primary treatment device, and its stability and accuracy are critical to the treatment outcome.

[0003] Existing human simulation phantoms for quality control and verification are single-function and used for specific types of tests. This results in the need to change different phantoms to complete multiple quality control tasks, and operators spend a lot of time on phantom placement, leading to low quality control efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a human simulation phantom for quality control and verification in radiotherapy, in order to solve the aforementioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A human simulation phantom for quality control and verification in radiotherapy includes multiple parts assembled by means of a mortise and tenon structure or connectors. The multiple parts of the human simulation phantom include a first phantom, a second phantom, a third phantom, and a fourth phantom connected in sequence. Adjacent parts of the first phantom, the second phantom, the third phantom, and the fourth phantom are connected by means of the mortise and tenon structure or connectors.

[0007] Preferably, the first mold includes a head and neck model, a first mold cavity, a mold insert assembly, and an installation and fixing device. The head and neck model is similar to the geometric contour of a human head and neck, and the head and neck model is provided with a cross mark. The first mold cavity is located below the head and neck model. The mold insert assembly includes a cylindrical first insert and a cylindrical second insert. The first insert and the second insert are inserted into the first mold cavity. The first insert includes a front end face and a rear end face. The rear end face is connected to the head and neck model and the installation and fixing device. The arrangement of the first insert and the second insert forms a cross mark.

[0008] Preferably, the front end face of the first plug-in is provided with a regular hexahedral slot, the slot is symmetrically distributed with respect to the horizontal center line of the first plug-in, the slot is embedded in the first cube mold and the second cube mold, the front end face of the first cube mold and the second cube mold coincides with the front end face of the first plug-in, and a cross mark is drawn along the center position on the front end face of the first cube mold and the second cube mold.

[0009] Preferably, the first cube phantom includes metal marker points a, b, c, d, and e. Metal marker point a is located at the center of the first cube phantom, metal marker point b is located diagonally below and to the right of metal marker point a, and metal marker point c is located diagonally below and to the right of metal marker point b, with an inclination angle of °. Metal marker points a, b, and c are located on the same straight line. Metal marker point d is located above metal marker point a, and metal marker point e is located above metal marker point d. Metal marker points a, d, and e are located on the same horizontal line.

[0010] Preferably, the second cube mold body is provided with a first film placement area, an outer sphere, and an inner sphere, the center of the outer sphere and the inner sphere being the center of the second cube mold body, and the second cube mold body is provided with the first film placement area in the horizontal and vertical directions respectively.

[0011] Preferably, a second plug-in through hole is provided at the center of the second plug-in, and the length of the second plug-in through hole is equal to the length of the second plug-in in the axial direction of the second plug-in.

[0012] Preferably, a cross mark is provided at the center of the second phantom. The second phantom includes a spinal cord plug, a lung tissue simulation plug, a second phantom through hole, a third plug, a fourth plug, and a simulated tumor target. The lung tissue simulation plug is provided with a third plug and a fourth plug for tumor simulation. Both the third plug and the fourth plug have spherical simulated tumor targets.

[0013] Preferably, the third plug-in is provided with a third plug-in through hole, which extends from the center of the simulated tumor target to one side of the third plug-in and penetrates through it, and the fourth plug-in is provided with a second film placement area inside.

[0014] Preferably, the third mold body includes two concentric third mold bodies a and b, and the third mold body is provided with third mold body through holes distributed on the third mold body a and the third mold body b, and the fifth plug is inserted into the third mold body through holes.

[0015] Preferably, the fourth mold body includes two concentric fourth mold bodies a and b, and the fourth mold body is provided with identification through holes, which are distributed on the fourth mold body a and the fourth mold body b. Beneficial effects

[0016] Improve quality control efficiency: By designing a multi-functional modular mold, the frequency of mold replacement is reduced and the operation process is simplified, thereby improving the efficiency of quality control work.

[0017] Cost reduction: Modular design facilitates the replacement and maintenance of damaged parts, extends the service life of the mold, and reduces the overall cost of use.

[0018] Enhanced flexibility and applicability: The detachable and combinable design allows the phantom to adapt to various quality control testing needs and meet the quality control requirements of different models and specifications of accelerators.

[0019] Multifunctionality: The modular design allows for different quality control tests, such as dose distribution, geometric symmetry, and resolution, reducing the time and manpower costs of changing phantoms. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the human body simulation model structure in this embodiment.

[0021] Figure 2 This is a cross-sectional view of the first model in this embodiment.

[0022] Figure 3 This is a cross-sectional view of the first plug-in in this embodiment.

[0023] Figure 4 This is a schematic diagram of the first cubic phantom structure in this embodiment.

[0024] Figure 5 This is a schematic diagram of the structure of the second cubic model in this embodiment.

[0025] Figure 6 This is a cross-sectional view of the second plug-in in this embodiment.

[0026] Figure 7 This is a schematic diagram of the second phantom structure in this embodiment.

[0027] Figure 8 This is a schematic diagram of the second phantom structure in this embodiment.

[0028] Figure 9 This is a cross-sectional view of the third plug-in in this embodiment.

[0029] Figure 10 This is a cross-sectional view of the fourth plug-in in this embodiment, cut along the first plane.

[0030] Figure 11This is a cross-sectional view of the fourth plug-in in this embodiment, cut along the second plane.

[0031] Figure 12 This is a schematic diagram of the third modulus structure in this embodiment.

[0032] Figure 13 This is a schematic diagram of the fourth module structure in this embodiment.

[0033] Marked in the image:

[0034] 100. First mold body; 101. Head and neck model; 102. First mold body cavity; 103. Mold body insert assembly; 10. First cubic mold body; 20. Second cubic mold body; 5. First film placement area; 6. Outer sphere; 7. Inner sphere; 30. First insert; 3. Slot; 31. Second insert; 4. Second insert through hole; 104. Mounting and fixing device;

[0035] 200. Second phantom; 40. Lung tissue simulation plug-in; 50. Spinal cord plug-in; 8. Second phantom through-hole; 60. Third plug-in; 601. Third plug-in through-hole; 61. Fourth plug-in; 602. Second film placement area; 9. Simulated tumor target;

[0036] 201. The third module;

[0037] 202. Fourth module. Detailed Implementation

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0039] like Figure 1As shown, a human body simulation phantom for quality control and verification in radiotherapy includes multiple parts assembled by a tenon structure or connectors. These parts include a first phantom 100, a second phantom 200, a third phantom 201, and a fourth phantom 202 connected sequentially. Adjacent phantoms 100, 200, 201, and 202 are connected by the tenon structure or connectors, ensuring a tight fit between their interconnecting end faces. In practical use, operators can select appropriate components for assembly based on quality control requirements. In this embodiment, the phantom is positioned using an adjustable base and secured by a quick-locking mechanism to complete the quality control test.

[0040] Implementation Example 1

[0041] refer to Figure 1 and Figure 2 The first phantom 100 includes a head and neck model 101, a first phantom cavity 102, a phantom insert assembly 103, and a mounting and fixing device 104. The head and neck model 101 imitates the geometric contour of the human head and neck, and its exterior is encapsulated with a material equivalent to human soft tissue. Internally, it includes a simulated skull, and the portion of the simulated skull, except for the first phantom cavity 102, is filled with human soft tissue material. The simulated skull is made of a resin material containing high calcium and high calcium, with a density of 1.64±0.1 g / cm³ and a thickness of 0.6 cm. The soft tissue equivalent material, specifically a special epoxy resin, exhibits similar radiation scattering and absorption characteristics to human tissue.

[0042] like Figure 2 As shown, the head and neck model 101 has a head circumference of 55cm and a head and neck length of 25cm. Cross marks are drawn on the top of the head, the forehead above the bridge of the nose, and the left and right sides of the occipital bone to facilitate the operator's positioning according to the laser line. The first mold cavity 102 is located 5cm directly below the top of the head of the head and neck model 101 and extends through the neck along the head and neck direction. The mold plug-in assembly 103 includes two sets of cylindrical plugs of the same size, namely the first plug-in 30 and the second plug-in 31, which are inserted into the first mold cavity 102 for different quality control tests.

[0043] like Figure 3 As shown, the first plug-in 30 has a radius of 5cm and a length of 20cm. It includes a front face and a rear face. The rear face has a circular outer edge with a radius slightly larger than 5cm, which is used to connect and fix it to the head and neck model 101 and the mounting and fixing device 104. Horizontal and vertical marking lines are drawn around the outer periphery of the first plug-in 30 and the second plug-in 31 at the center position, and the intersection of the horizontal and vertical marking lines forms a cross mark.

[0044] refer to Figures 3-5 The first insert 30 has a hexahedral slot 3 on its front end face, symmetrically distributed with respect to the horizontal center line of the first insert 30. The first cubic mold 10 and the second cubic mold 20 are alternately embedded in the slot 3. When the first cubic mold 10 and the second cubic mold 20 are embedded in the hexahedral slot 3, their front ends coincide with the front end face of the first insert 30. A cross mark is drawn along the center position on the front end face of the first cubic mold 10 and the second cubic mold 20. The horizontal or vertical marking lines of the cross mark extend and coincide with the horizontal or vertical marking lines of the first insert 30. A "top" mark is provided on one end face of the first cubic mold 10 and the second cubic mold 20 to indicate the up and down direction. By placing the first cubic mold 10 in the first insert 30 and scanning it through the accelerator imaging system, it can be used for mechanical performance quality control of the linear accelerator, specifically including laser lamp consistency, gantry / collimator / treatment bed mechanical isocenter testing, and treatment bed positioning accuracy.

[0045] like Figure 4 As shown, the first cubic model 10 has a side length greater than 5cm and includes metal markers a, b, c, d, and e inside. The diameter of each metal marker does not exceed 1.5mm. Metal marker a is located at the center of the first cubic model 10. Metal marker b is located diagonally below and to the right of metal marker a, with an inclination angle of 45°. Metal marker c is located diagonally below and to the right of metal marker b, with an inclination angle of 45°. Metal markers a, b, and c are located on the same straight line. Metal marker d is located directly above metal marker a, and metal marker e is located directly above metal marker d. Metal markers a, d, and e are on the same horizontal line. Metal marker b is 1 cm away from metal marker a in both the horizontal and vertical directions. Metal marker c is 2 cm away from metal marker a in both the horizontal and vertical directions. Metal marker d is 1 cm away from metal marker a in the horizontal direction. Metal marker e is 2 cm away from metal marker a in the horizontal direction.

[0046] like Figure 5 As shown, the external dimensions of the second cube mold 20 are the same as those of the first cube mold 10. A pair of concentric spheres are set with the center of the second cube mold 20 as the center. The outer sphere 6 has a diameter of 32cm and is made of acrylic material, and the inner sphere 7 has a diameter of 19cm and is made of tungsten. The first film placement areas 5 are set along the horizontal and vertical directions of the second cube mold 20, and the two first film placement areas 5 intersect at right angles. The vertical distance from the center of the sphere to the two first film placement areas 5 is equal.

[0047] The second cube phantom 20 and the first plug-in 30 are used together for dose verification of area overlap rate in head tumors and AQA testing in stereotactic radiotherapy.

[0048] Figure 6 As shown, the second plug-in 31 includes a cylindrical second plug-in through-hole 4 at its internal center for housing a finger-shaped ionization chamber. One end of the second plug-in through-hole 4 penetrates the rear end face of the second plug-in 31, and the other end extends into the second plug-in 31 to the front end face, i.e., in the axial direction of the second plug-in 4. The length of the second plug-in through-hole 4 is equal to the length of the second plug-in 31. The second plug-in 31 can be used for accelerator absolute dose testing.

[0049] Implementation Example 2

[0050] Figure 7-8 As shown, the second phantom 200 is mainly used to simulate the human chest and abdominal organs. It is made of human tissue equivalent materials to imitate the structure and contour of human chest organs, including soft tissue, lung tissue and spinal cord. The second phantom 200 is an elliptical cylinder with a coronal plane major axis diameter between 28-35cm and a minor axis diameter between 24-26cm. The front and rear end faces of the second phantom 200 are marked with "H" and "F" to indicate the head-to-toe direction. Cross marks are drawn at the center of the top, bottom and left and right sides of the second phantom 200 to facilitate positioning according to the laser lines.

[0051] Furthermore, the second phantom 200 includes a spinal cord insert 50, a lung tissue simulation insert 40, and multiple sets of second phantom through holes 8. A cross mark is provided at the center of the second phantom 200, and the second phantom through holes 8 are used to place finger-shaped ionization chambers. The lung tissue simulation insert 40 is equipped with a third insert 60 and a fourth insert 61 for tumor simulation. Both the third insert 60 and the fourth insert 61 are equipped with spherical simulated tumor targets 9. The simulated tumor targets 9 have a diameter of 3 cm and a density greater than that of the lung tissue simulation insert 40, approximately 1.2 g / cm3. The center of the simulated tumor targets 9 extends outward, and a cross mark is drawn on the surface of the second phantom 200 to indicate the position of the simulated tumor targets 9.

[0052] Figure 9 As shown, a third plug-in through hole 601 is machined inside the third plug-in 60 for placing the finger-shaped ionization chamber. The third plug-in through hole 601 extends from the center of the simulated tumor target 9 to one side end face of the third plug-in 60 and penetrates through it. Figure 10-11 As shown, the fourth plug-in 61 has a second film placement area 602 inside, which can accommodate two mutually perpendicular films. The two methods can be used interchangeably for point dose verification and planar dose verification of patient planning.

[0053] Implementation Example 3

[0054] Figure 12 As shown, the third phantom 201 is a cylinder. The diameters of the minor and major axes of the coronal plane of the third phantom 201 are the same as those of the minor and major axes of the coronal plane of the second phantom 200 and are aligned at the center. It is made of polystyrene material with a density equivalent to water. It is used to calibrate the tissue electron density and CT value of the CT equipment. There are marking lines at the central axis positions in the horizontal and vertical directions on the body surface. The third phantom 201 includes two concentric third phantoms a and b. It can be disassembled and combined for use, and multiple third phantom through holes are evenly distributed. The third phantom through holes are distributed on the third phantoms a and b with the center of the third phantom 201 as the center. Different radius values ​​are set and arranged in two circles. The interval between two adjacent through holes in the same circle is greater than or equal to 30°. The third phantom through holes are inserted into the fifth plug-in, which is a plug-in for different tissue equivalent electron densities.

[0055] Furthermore, the tissue materials of the equivalent electron density plug-ins for different tissues include at least equivalent water, muscle, bone, lung, liver, and fat. The equivalent water density is 1.00 g / cm3, the muscle density is 1.06 g / cm3, the bone density is 1.5-1.82 g / cm3, the lung density is 0.2-0.5 g / cm3, the liver density is 1.07 g / cm3, and the fat density is 0.96 g / cm3. The number of equivalent electron density plug-ins for different tissues is two sets, and no two tissues with the same equivalent electron density can appear on the same circumference. All equivalent electron density plug-ins for different tissues have the same height, and the height ratio with the third phantom 201 is 1:1.

[0056] Implementation Example 4

[0057] Figure 13 As shown, the fourth phantom 202 is composed of two concentric fourth phantoms a and b. Horizontal and vertical marking lines are set on the outer surface for laser lamp placement. The interior also includes multiple marking through holes for placing finger-shaped ionization chambers. Four of these marking through holes are located in the vertical direction of the center of the fourth phantom 202 and are distributed in a straight line. They are the first marking through hole, the second marking through hole, the third marking through hole, and the fourth marking through hole.

[0058] Furthermore, the distance between the center of the first marking through-hole and the top of the fourth phantom 202 is 5cm, the distance between the center of the second marking through-hole and the top of the fourth phantom 202 is 10cm, the distance between the center of the third marking through-hole and the top of the fourth phantom 202 is 16cm (i.e., the center of the fourth phantom 202), and the distance between the center of the fourth marking through-hole and the top of the fourth phantom 202 is 20cm. In addition to the first, second, third, and fourth marking through-holes, eight marking through-holes are evenly arranged around the interior of the fourth phantom 202 for housing finger-shaped ionization chambers. The fourth phantom 202 can be used for radiation quality testing and CT dose testing.

[0059] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A human body simulation phantom for quality control and verification in radiotherapy, comprising multiple parts assembled by means of a tenon structure or connectors, characterized in that, The human simulation model comprises a first model (100), a second model (200), a third model (201), and a fourth model (202) connected in sequence. Among the first model (100), the second model (200), the third model (201), and the fourth model (202), adjacent ones are connected by the falcon structure or connector.

2. The human simulation phantom for quality control and verification of radiotherapy according to claim 1, characterized in that, The first mold (100) includes a head and neck model (101), a first mold cavity (102), a mold insert assembly (103), and a mounting and fixing device (104). The head and neck model (101) is similar to the geometric contour of the human head and neck. The head and neck model (101) is provided with a cross mark. The first mold cavity (102) is located below the head and neck model (101). The mold insert assembly (103) includes a cylindrical first insert (30) and a second insert (31). The first insert (30) and the second insert (31) are inserted into the first mold cavity (102). The first insert (30) includes a front end face and a rear end face. The rear end face is connected to the head and neck model (101) and the mounting and fixing device (104). The arrangement of the first insert (30) and the second insert (31) forms a cross mark.

3. The human simulation phantom for quality control and verification of radiotherapy according to claim 2, characterized in that, The front end face of the first plug-in (30) is provided with a regular hexahedral slot (3). The slot (3) is symmetrically distributed with respect to the horizontal center line of the first plug-in (30). The slot (3) is embedded in the first cube mold (10) and the second cube mold (20). The front end face of the first cube mold (10) and the second cube mold (20) coincides with the front end face of the first plug-in (30). A cross mark is drawn along the center position on the front end face of the first cube mold (10) and the second cube mold (20).

4. The human simulation phantom for quality control and verification of radiotherapy according to claim 3, characterized in that, The first cube mold (10) includes metal marker a, metal marker b, metal marker c, metal marker d and metal marker e. Metal marker a is located at the center of the first cube mold (10). Metal marker b is located to the right and below metal marker a. Metal marker c is located to the right and below metal marker b, with an inclination angle of 45°. Metal marker a, metal marker b and metal marker c are located on the same straight line. Metal marker d is located above metal marker a. Metal marker e is located above metal marker d. Metal marker a, metal marker d and metal marker e are located on the same horizontal line.

5. The human simulation phantom for quality control and verification of radiotherapy according to claim 3, characterized in that, The second cube mold (20) is provided with a first film placement area (5), an outer sphere (6), and an inner sphere (7). The center of the outer sphere (6) and the inner sphere (7) is the center of the second cube mold (20). The second cube mold (20) is provided with the first film placement area (5) in the horizontal and vertical directions respectively.

6. The human simulation phantom for quality control and verification of radiotherapy according to claim 2, characterized in that, The second plug-in (31) has a second plug-in through hole (4) at its center. In the axial direction of the second plug-in (31), the length of the second plug-in through hole (4) is equal to the length of the second plug-in (31).

7. The human simulation phantom for quality control and verification of radiotherapy according to claim 1, characterized in that, The second phantom (200) has a cross mark at its center. The second phantom (200) includes a spinal cord plug (50), a lung tissue simulation plug (40), a second phantom through hole (8), a third plug (60), a fourth plug (61), and a simulated tumor target (9). The lung tissue simulation plug (40) is equipped with a third plug (60) and a fourth plug (61) for tumor simulation. Both the third plug (60) and the fourth plug (61) have spherical simulated tumor targets (9).

8. The human simulation phantom for quality control and verification of radiotherapy according to claim 7, characterized in that, The third plug-in (60) is provided with a third plug-in through hole (601). The third plug-in through hole (601) extends from the center of the simulated tumor target (9) to one side end face of the third plug-in (60) and penetrates through it. The fourth plug-in (61) is provided with a second film placement area (602).

9. The human simulation phantom for quality control and verification of radiotherapy according to claim 1, characterized in that, The third module (201) includes two concentric third modules a and third modules b. The third module (201) is provided with third module through holes, which are distributed on the third module a and third module b. The fifth plug is inserted into the third module through holes.

10. The human simulation phantom for quality control and verification of radiotherapy according to claim 1, characterized in that, The fourth module (202) includes two concentric fourth modules a and b, and the fourth module (202) is provided with identification through holes, which are distributed on the fourth modules a and b.

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