CN217339818U - Radiotherapy CBCT quality control detection die body - Google Patents
Radiotherapy CBCT quality control detection die body Download PDFInfo
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- CN217339818U CN217339818U CN202220724219.6U CN202220724219U CN217339818U CN 217339818 U CN217339818 U CN 217339818U CN 202220724219 U CN202220724219 U CN 202220724219U CN 217339818 U CN217339818 U CN 217339818U
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Abstract
The utility model discloses a radiation therapy CBCT quality control detection die body, which comprises a base and a characteristic module; a concave part for placing the characteristic module is formed in the middle of the base, four corners of the concave part are provided with magnetic suction installation grooves, and the bottom of each magnetic suction installation groove is provided with a magnet; supporting legs penetrating through the base are arranged at four corners of the base; the characteristic module is of a cubic laminated structure and sequentially comprises a water mold body, a central contact ratio module, a low-resolution module and a high-resolution module from top to bottom; a cylindrical water storage cavity is formed in the water mold body, a water conveying pipeline and an exhaust pipeline are formed at the top of the water storage cavity upwards, and the water conveying pipeline and the exhaust pipeline penetrate through the upper wall of the water mold body to form a water inlet and an exhaust hole respectively; and the geometric centers of the central contact ratio module, the low-resolution module and the high-resolution module are all provided with first mark points. The utility model discloses simple structure, function are comprehensive, convenient to use, easily promote and use.
Description
Technical Field
The utility model relates to a medical radiation equipment quality control detection area specifically is a radiotherapy CBCT quality control detects die body.
Background
Radiotherapy CBCT is a cone-beam X-ray tomography (CBCT) device carried by radiotherapy equipment (such as a medical electron linear accelerator), which can image tumor patients, know the positioning error of the patients at any time and correct the positioning error so as to ensure the radiotherapy effect. The CBCT is used for online positioning and offline adaptive correction of tumors and real-time adjustment, so that the positioning precision of a patient is greatly improved, a basis is provided for correctly setting a planned target area, and the clinical target area of head and neck tumors and lung tumors can be effectively reduced, so that normal tissue complications are reduced.
The key to the success of tumor radiotherapy is the accuracy and precision of patient positioning and the dose received. Each tumor patient requires location and dose verification prior to radiation therapy to ensure that the target tumor volume receives a high dose while the normal tissue surrounding the target volume receives a lower dose. At present, the positioning mode in the treatment process of tumor patients which is commonly used in clinic is a radiotherapy CBCT positioning method. The medical technical personnel adopt the CBCT function of radiotherapy equipment, carry out before radiotherapy implementation or the position before implementation in-process to the radiotherapy patient and verify, then with treatment plan's image fitting to confirm the accurate position of patient's target area, and then guarantee the accuracy nature of clinical implementation radiotherapy.
In view of this, imaging quality and position localization functions are of exceptional importance for radiotherapy apparatus. Quality Assurance (QA) and Quality Control (QC) of CBCT radiotherapy have become increasingly important issues for medical institutions, and imaging plays a key role in obtaining the best clinical image, so that the medical institutions need to detect relevant parameters affecting image quality, and detection phantoms are important tools for quality control detection.
At present, the detection standard of radiotherapy CBCT quality control is not developed in China, so that a radiotherapy CBCT quality control detection die body is developed to prepare for a quality control detection technology service institution and a medical institution to know the imaging quality and the positioning function of radiotherapy equipment, and the radiotherapy CBCT quality control detection die body is expected to be applied and popularized.
SUMMERY OF THE UTILITY MODEL
The utility model provides a radiation therapy CBCT quality control detects die body for solving above-mentioned technical problem.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a radiotherapy CBCT quality control detection die body comprises a base and a characteristic module; a concave part for placing the characteristic module is formed in the middle of the base, four corners of the concave part are provided with magnetic suction installation grooves, and the bottom of each magnetic suction installation groove is provided with a magnet; supporting legs penetrating through the base are arranged at four corners of the base; the characteristic module is of a cubic laminated structure and sequentially comprises a water mold body, a central contact ratio module, a low-resolution module and a high-resolution module from top to bottom; a cylindrical water storage cavity is formed in the water mold body, a water conveying pipeline and an exhaust pipeline are formed at the top of the water storage cavity upwards, and the water conveying pipeline and the exhaust pipeline penetrate through the upper wall of the water mold body to form a water inlet and an exhaust hole respectively; and the geometric centers of the central contact ratio module, the low-resolution module and the high-resolution module are all provided with first mark points.
Furthermore, the bottom of the supporting leg is provided with an anti-skid rubber mat.
Furthermore, arc-shaped chamfers are formed at four side edges of the characteristic module.
Furthermore, four corners of the characteristic module form through fixing holes, the connecting rod penetrates through the fixing holes and is locked at the bottom through nuts, and the four sub-modules of the characteristic module are tightly attached.
Furthermore, a horizontal bubble is arranged at the center of the top surface of the water mold body, a scale line is radiated to the periphery by taking the horizontal bubble as the center to form a cross mark line, and the side surface of each sub-module is also provided with the cross mark line; the center of at least one side of the water mould body is also provided with a horizontal bubble.
Furthermore, six second mark points are further arranged inside the central coincidence degree module and are respectively arranged on the vertex of a regular hexagon, and the geometric center of the regular hexagon is coincided with the geometric center of the central coincidence degree module.
Furthermore, three cavity groups are formed on the low-resolution mold body, each cavity group comprises five cylindrical cavities with different diameters of the bottom surface, and the cavities in the cavity groups are arranged in the order from the small bottom surface diameter to the large bottom surface diameter or from the large bottom surface diameter to the small bottom surface diameter; and three substances with different densities with the main body part of the low-resolution die body are filled in the cavity.
Furthermore, the high-resolution die body takes the geometric center as the center of a circle, a plurality of metal strip groups are arranged along the circumferential direction, each metal strip group is provided with at least two metal strips, the metal strips in the same group have the same size, and are arranged in parallel at equal intervals.
Furthermore, the depth of the magnetic suction installation groove is equal to the height of the nut.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model relates to a detecting mould body which has strong function, high discrimination structural material is similar to the density of each structural tissue of the human body, and the size is approximately the same as the human body, thus being capable of highly simulating the human body characteristics; the die body comprises a plurality of sub-modules, each sub-module can be flexibly assembled, positioning is convenient, and a plurality of indexes can be measured; the die body is provided with clear mark points and mark lines for prompting, is easy to position, and is also provided with a horizontal indicating assembly for facilitating positioning.
Drawings
FIG. 1 is a schematic diagram of a feature module of the present invention;
FIG. 2 is a schematic structural view of the base of the present invention;
fig. 3 is a top view of the reclaimed water mold body according to the present invention;
fig. 4 is a top view of the center overlap ratio module of the present invention;
fig. 5 is a top view of the low resolution module of the present invention;
fig. 6 is a bottom view of the middle/high resolution module of the present invention.
Wherein, 1, water mold body; 2. a central contact ratio module; 3. a low resolution module; 4. a high resolution module; 5. a connecting rod; 6. a nut; 7. plugging with a thread; 8. horizontally soaking; 9. a base; 91. a recessed portion; 92. a magnetic suction installation groove; 10. supporting legs; 11. a water inlet; 12. a water storage cavity; 13. a metal strip; 14. a first marking point; 15. an exhaust hole; 16. and a second marking point.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-6, a radiation therapy CBCT quality control detection phantom includes a base 9 and a feature module.
A concave part 91 for placing the characteristic module is formed in the middle of the base 9, and supporting legs 10 penetrating through the base 9 are arranged at four corners of the base 9; the external thread on the supporting foot 10 is matched with a threaded hole formed on the base 9, and the length of the part of the supporting foot 10 penetrating out of the lower surface of the base 9 is adjustable, namely the supporting foot 10 is rotated to realize the purpose. By adjusting the support feet 10 in different positions and by means of the indication of the level bubble 8, the entire device can be adjusted to a level state when being set. Preferably, the anti-skidding cushion is installed to supporting legs 10 bottom, and the anti-skidding cushion can make the utility model discloses difficult and the interplane relative slip takes place when arranging in on the smooth plane, does benefit to the pendulum position.
The characteristic module is a cubic laminated structure and sequentially comprises four sub-modules, namely a water mold body 1, a central coincidence degree module 2, a low resolution module 3 and a high resolution module 4 from top to bottom. Preferably, four side edges of the feature module form circular arc chamfers, so that the feature module is convenient to process on one hand, and is more comfortable to hold when being placed on the other hand. Four corners of the characteristic module form through fixing holes, the connecting rod 5 penetrates through the characteristic module from top to bottom from the positions of the fixing holes and is locked at the bottom through the nuts 6, and the four sub-modules of the characteristic module are tightly attached. Through the connection mode, the use is more flexible and the replacement is convenient.
Four corners of the recess 91 are provided with magnetic suction mounting grooves 92, and the bottom of the magnetic suction mounting groove 92 is provided with a magnet. Nut 6 and magnetism are inhaled mounting groove 92 shape position and are matchd, and when the characteristic module was arranged in on base 9 promptly, nut 6 was located magnetism and is inhaled mounting groove 92 in, and with the magnet contact of magnetism mounting groove 92 bottom, magnet was inhaled nut 6 to make the characteristic module install more firm on base 9. When the device needs to be placed in a part of test occasions by rotating 90 degrees, the magnetic attraction structure can effectively prevent the feature module from falling off from the base 9.
The center of the top surface of the water mold body 1 is provided with a horizontal bubble 8, and a scale line is radiated to the periphery by taking the horizontal bubble 8 as the center to form a cross mark line. The purpose of designing the cross marking line is to facilitate laser line positioning in the using process, so that when the die body is designed, the cross positioning line is required to be arranged on the uppermost layer and is also required to be arranged on the side surface of each sub-module. In addition, the center of at least one side of the water mold body 1 is also provided with a horizontal bubble 8, and when the device needs to be placed by rotating 90 degrees in certain measurement scenes, one side provided with the horizontal bubble 8 is selected as a reference for adjusting the level.
A cylindrical cavity is formed in the water die body 1 and serves as a water storage cavity 12, a water conveying pipeline and an exhaust pipeline are formed at the top of the water storage cavity 12 upwards, and both the water conveying pipeline and the exhaust pipeline penetrate through the upper wall of the water die body 1 to form a water inlet 11 and an exhaust hole 15. The inner walls of the water inlet 11 and the air exhaust hole 15 are provided with internal threads, so that the water storage cavity 12 is conveniently closed by using the plug 7. Compared with other materials, the purity and the uniformity of water are better controlled, the density is close to that of a human body, and the manufacturing cost is low. Only water needs to be poured in from the water inlet 11 until full. After filling, the water inlet 11 and the air outlet 15 are sealed by using the plug 7.
The geometric center of the central coincidence module 2 is provided with a first mark point 14, the periphery of the first mark point 14 is also provided with six second mark points 16 which are respectively arranged on the vertexes of a regular hexagon, and the geometric center of the regular hexagon is coincided with the geometric center of the central coincidence module 2. The first marker 14 and the second marker 16 are both round metal pieces or spherical metal particles. The distance from the first marker 14 to the second marker 16 is typically 5cm, and the distance between two adjacent second markers 16 is also 5 cm.
A first mark point 14 is arranged at the geometric center of the low-resolution mold body 3, three cavity groups are formed at the periphery of the first mark point 14, each cavity group comprises five cylindrical cavities with different bottom surface diameters, and the cavities in the cavity groups are arranged according to the sequence that the bottom surface diameters are from small to large or from large to small; the cavity is filled with three substances with different densities from the die body, so that the contrast of the three cavity groups is respectively 0.3%, 0.5% and 1%.
The geometric center of the high-resolution die body 4 is provided with a first mark point 14, a plurality of metal strip groups are distributed along the circumferential direction by taking the geometric center of the high-resolution die body 4 as a circle center, each metal strip group is provided with at least two metal strips 13, and the metal strips 13 in the same group are mutually arranged in parallel and have equal intervals.
The body part of each submodule of the application is made of a material with the density similar to that of a human body, and preferably, the size of the upper surface and the lower surface of each submodule is 18cm multiplied by 18 cm.
The first embodiment is as follows: CBCT quality control detection item and detection method in radiotherapy
1. Imaging center to treatment center coincidence measurement
(1) Rotating an accelerator frame or a collimator to 0 degree, placing a CBCT quality control detection die body on a treatment couch, and positioning the die body according to the external marking line of the die body and a laser lamp to align the center of the die body with the treatment isocenter.
(2) Taking the central coincidence degree module 2 as a reference, acquiring exposure of an MV or kV-level imaging program to obtain a phantom image at 0 degrees or 90 degrees of an accelerator frame respectively, and measuring coordinate values (x1, y1, z1) of an imaging center and coordinate values (x2, y2, z2) of an imaging position of a first marking point 14 at the center of the central coincidence degree module 2; then the imaging center to treatment center deviation d satisfies:
(3) and (3) respectively taking the low-resolution module 3 and the high-resolution module 4 as references, repeating the process (2), and measuring and calculating the central deviation of the CBCT image and the radiation field image.
2. High contrast resolution measurement
(1) And placing the CBCT quality control detection mold body on a treatment bed, adjusting the position of the CBCT quality control detection mold body, and positioning the mold body.
(2) The accelerator frame or collimator is rotated to 0 deg., and the exposure is performed using the conditions common to image mode.
(3) On the cross-sectional image, the image is adjusted to the state where the viewer thinks the detail is clearest, and the smallest detail size that can be resolved is recorded.
3. Low contrast resolution measurement
(1) And placing the die body at the treatment isocenter position.
(2) The accelerator frame or collimator is rotated to 0 deg., and the exposure is performed using the conditions normally used for image mode.
(3) On the cross-sectional image, the image is adjusted to the state that the viewer considers the detail to be clearest, the minimum diameter that can be observed by the detail of each nominal contrast is recorded, and the low-contrast resolution result is calculated.
4. Image uniformity measurement
(1) The water mold body 1 is filled with pure water, and a water inlet 11 and an exhaust hole 15 are blocked by using a plug 7.
(2) The outer axis of the mold body is perpendicular to the exposure axis, and the mold body is arranged at the exposure isocenter.
(3) The accelerator frame or collimator is rotated to 0 deg., and the exposure is performed using the conditions normally used for image mode.
(4) And taking the regions of interest (ROI) with the diameter of 20% of the image in the directions of 3 points, 6 points, 9 points and 12 points at the center and the periphery of the image respectively, measuring the average CT values of the 5 ROIs respectively, and taking the maximum difference absolute value of the average CT values with the ROI at the center of the image as the measured value of the image uniformity.
5. Error in range finding
(1) And (4) positioning the die body, and selecting a central contact ratio module 2.
(2) And (4) carrying out CBCT acquisition and image reconstruction according to the common CBCT scanning conditions of the equipment.
(3) Taking the cross-section image of the central position ranging module, using a system with a ranging tool to measure the distance between any two mark points (including the first mark point 14 or the second mark point 16), and calculating the deviation of the measured value and the actual value because the distance between any two mark points is known.
Example two:
part of the measuring scene needs to be placed by rotating the device by 90 degrees, and one side surface provided with the horizontal bubble 8 is selected as a reference for adjusting the level. At the moment, the supporting feet 10 are replaced by screws, the base 9 is fixed on a vertical perforated plate through the screws, the screws are finely adjusted according to the state of the horizontal bubble 8 on the side surface of the water mold body 1, so that the whole characteristic module is kept horizontal, and then the detection is executed according to the set test item.
Claims (9)
1. A radiotherapy CBCT quality control detection die body is characterized in that the die body comprises a base (9) and a characteristic module; a concave part (91) for placing the characteristic module is formed in the middle of the base (9), four corners of the concave part (91) are provided with magnetic suction installation grooves (92), and the bottom of each magnetic suction installation groove (92) is provided with a magnet; supporting legs (10) penetrating through the base (9) are arranged at four corners of the base (9); the characteristic module is of a cubic laminated structure and sequentially comprises a water mold body (1), a central contact ratio module (2), a low resolution module (3) and a high resolution module (4) from top to bottom; a cylindrical water storage cavity (12) is formed in the water mold body (1), a water conveying pipeline and an exhaust pipeline are formed at the top of the water storage cavity (12) upwards, and the water conveying pipeline and the exhaust pipeline penetrate through the upper wall of the water mold body (1) to form a water inlet (11) and an exhaust hole (15) respectively; the geometric centers of the central coincidence degree module (2), the low resolution module (3) and the high resolution module (4) are all provided with first mark points (14).
2. The radiotherapy CBCT quality control detection phantom as claimed in claim 1, wherein the bottom of the supporting leg (10) is provided with a non-slip rubber pad.
3. The radiation therapy CBCT quality control module of claim 1, wherein said feature modules are rounded at four lateral edges.
4. The radiation therapy CBCT quality control detection die body as claimed in claim 1, wherein fixing holes are formed at four corners of the feature module, and connecting rods (5) penetrate through the fixing holes and are locked at the bottom by nuts (6) so as to enable four sub-modules of the feature module to be tightly attached.
5. The radiotherapy CBCT quality control detection phantom according to claim 1, wherein the water phantom (1) is provided with a horizontal bubble (8) at the center of the top surface, a graduation line is radiated from the horizontal bubble (8) to the periphery to form a cross-mark line, and the side surface of each sub-module is also provided with a cross-mark line; the center of at least one side of the water mould body is also provided with a horizontal bubble (8).
6. The radiation therapy CBCT quality control testing phantom as claimed in claim 1, wherein said central coincidence module (2) further comprises six second marker points (16) disposed therein and arranged at the vertices of a regular hexagon whose geometric center coincides with the geometric center of the central coincidence module (2).
7. The radiation therapy CBCT quality control detection phantom as claimed in claim 1, wherein the low resolution module (3) is formed with three cavity groups, each cavity group comprises five cylindrical cavities with different diameters of the bottom surface, and the cavities in the cavity groups are arranged in the order of the diameters of the bottom surfaces from small to large or from large to small; the cavity is filled with three substances with different densities with the main body part of the low resolution module (3).
8. The radiation therapy CBCT quality control testing phantom according to claim 1, wherein said high resolution module (4) is arranged with a plurality of metal strip groups circumferentially centered around its geometric center, each metal strip group having at least two metal strips (13), the metal strips (13) in the same group being of the same size and being arranged in parallel at equal intervals.
9. The radiation therapy CBCT quality control detection mold body as claimed in claim 4, wherein the depth of the magnetic suction installation groove (92) is equal to the height of the nut (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220724219.6U CN217339818U (en) | 2022-03-28 | 2022-03-28 | Radiotherapy CBCT quality control detection die body |
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| CN202220724219.6U CN217339818U (en) | 2022-03-28 | 2022-03-28 | Radiotherapy CBCT quality control detection die body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445108A (en) * | 2022-10-21 | 2022-12-09 | 上海伽玛星科技发展有限公司 | Device for adjusting preset target area and patient position in radiotherapy process |
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2022
- 2022-03-28 CN CN202220724219.6U patent/CN217339818U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445108A (en) * | 2022-10-21 | 2022-12-09 | 上海伽玛星科技发展有限公司 | Device for adjusting preset target area and patient position in radiotherapy process |
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