Automatic dose verification system for radiotherapy

Abstract

The embodiment of the invention discloses an automatic dose verification system for radiotherapy. The system comprises a first sliding rail, a driving unit, a verification die body and an analysis unit, wherein the analysis unit is used for determining a first position of a to-be-irradiated position of the verification die body on the first slide rail, generating a driving instruction according to the first position, and sending the driving instruction to the driving unit; the driving unit is used for driving the verification die body to move to a first position on the first sliding rail in response to the driving instruction, so that the verification die body moves to a to-be-irradiated position corresponding to the first position, and the verification die body located at the to-be-irradiated position is projected by a first dose corresponding to the stereotactic radiotherapy plan; and the analysis unit is also used for acquiring a second dose received by the verification die body at the to-be-irradiated position, and verifying the second dose according to the first dose to obtain a dose verification result of the stereotactic radiotherapy plan. The problem that it is difficult to ensure accurate verification of the dosage corresponding to the SBRT plan is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of medical devices, and in particular to an automatic dose verification system for radiotherapy. Background Art

[0002] With the development of science and technology, stereotactic body radiation therapy (SBRT) technology is increasingly used in tumor treatment. Since SBRT plans have the characteristics of a target dose far higher than the prescribed dose and a steep drop in the dose outside the target, higher accuracy is required. A small error may lead to a large dose deviation. Therefore, the dose verification corresponding to the SBRT plan is particularly important for the accurate implementation of SBRT.

[0003] However, the current existing technology cannot guarantee accurate verification of the dose corresponding to the SBRT plan, which needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides an automatic dose verification system for radiotherapy, which solves the problem of difficulty in ensuring accurate verification of the dose corresponding to the SBRT plan.

[0005] According to one aspect of the present invention, there is provided an automatic dose verification system for radiotherapy, which may include: a first slide rail, a drive unit, a verification phantom, and an analysis unit; wherein:

[0006] An analysis unit is used to determine a first position of a position to be irradiated of the verification phantom on the first slide rail, generate a driving instruction according to the first position, and send the driving instruction to a driving unit;

[0007] a driving unit, configured to drive the verification phantom to move to a first position on the first slide rail in response to a driving instruction, so that the verification phantom moves to a position to be irradiated corresponding to the first position, and the verification phantom located at the position to be irradiated is irradiated with a first dose corresponding to the stereotactic radiotherapy plan;

[0008] The analysis unit is also used to obtain a second dose received by the verification phantom at the position to be irradiated, and verify the second dose according to the first dose to obtain a dose verification result of the stereotactic radiotherapy plan.

[0009] In the technical solution of the embodiment of the present invention, through the analysis unit, the first position of the position to be irradiated of the verification phantom on the first slide rail is determined. According to the first position, a driving instruction is generated and sent to the driving unit, so that the driving unit can drive the verification phantom based on the driving instruction; through the driving unit, in response to the driving instruction, the verification phantom is driven to move to the first position on the first slide rail, so that the verification phantom moves to the position to be irradiated corresponding to the first position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan, so that the position where the verification phantom is irradiated is the position irradiated with the first dose; the analysis unit is further configured to obtain the second dose received by the verification phantom at the position to be irradiated, and verify the second dose according to the first dose to obtain the dose verification result of the stereotactic radiotherapy plan, thereby realizing the dose verification of the SBRT plan. In the above technical solution, by moving the verification phantom to the position to be irradiated, the verification phantom can be irradiated at the position to be irradiated, avoiding a large difference between the second dose received and the dose that should actually be received, which affects the accuracy of the dose verification result, thereby solving the problem that it is difficult to ensure the accurate verification of the dose corresponding to the SBRT plan.

[0010] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0012] Figure 1 is a schematic structural diagram of an automatic dose verification system for radiotherapy according to an embodiment of the present invention;

[0013] Figure 2 is a schematic structural diagram of another automatic dose verification system for radiotherapy according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solution in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The same is true for "target", "original", etc., which will not be elaborated here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0016] Before introducing the embodiments of the present invention, an exemplary description will be given of the reasons for dose verification, the implementation process of the current dose verification scheme, and the reasons for the problem that it is difficult to ensure accurate verification of the dose corresponding to the SBRT plan, so as to better understand the reasons why the solution proposed in the embodiments of the present invention solves the problem of difficult to ensure accurate verification of the dose corresponding to the SBRT plan.

[0017] With the development of technology, precise radiotherapy, especially Stereotactic Body Radiation Therapy (SBRT), has been increasingly applied to the treatment of tumors. While ensuring a high dose to the tumor, SBRT minimizes the dose received by surrounding normal tissues as much as possible. Compared with conventional radiotherapy, SBRT can significantly improve the tumor control rate and reduce toxic and side reactions. SBRT mostly uses high doses, single or few fractions to achieve the target dose for treating tumors, and the SBRT plan (stereotactic radiotherapy plan) has a dose within the target area much higher than the prescribed dose and a steep dose fall outside the target area. Dose verification corresponding to the SBRT plan can ensure the accuracy of the dose irradiated to the tumor site of the target object during the treatment process. Therefore, dose verification corresponding to the SBRT plan is particularly important for the precise implementation of SBRT.

[0018] The current implementation methods of dose verification schemes include using films for two-dimensional dose verification. Specifically, the film is placed in solid water or a non-uniform phantom for dose irradiation corresponding to the SBRT plan. The scanner scans the image of the film after irradiation, and the gray-scale image of the scanned image is analyzed by computer. The gamma index (Gamma Index Analysis, Gamma) analysis is performed on the gray-scale image of the image, and the dose verification result is calculated. However, the above method of using films for two-dimensional dose verification is affected by many factors such as temperature and operation. The processing process is complex, it cannot be reused, and it is a two-dimensional dose verification. Therefore, it has the problems of high time and resource costs and difficulty in ensuring accurate dose verification. For this reason, currently, high-density flat-panel detectors such as Stereotactic Radiosurgery (SRS) Mapcheck are proposed for dose verification. Specifically, the flat-panel detector can be placed at a specified position in a phantom with a fixed position. After the beam is output, the dose distribution is recorded, and the gamma pass rate is calculated for the dose distribution through computer software to obtain the dose verification result. However, in the above method of using a flat-panel detector for dose verification, since the effective measurement area of the SRS Mapcheck is only 7 cm × 7 cm when the position is fixed, especially for small tumors with a wide distribution or multiple occurrences, it is difficult to perform accurate dose verification. For example, the phantom is fixed in the area a corresponding to position A, and a certain tumor is located in the area b corresponding to position B. Only part of the area a and area b overlap or do not overlap at all. Then, the phantom fixed in area a may only detect part of or not detect the dose corresponding to the SBRT plan projected in area b. Even if the phantom with a fixed position is manually moved to the specified position, it will make the verification process cumbersome, and due to the insufficient accuracy of manual movement, new errors are likely to be introduced, and it is also difficult to ensure accurate verification of the dose corresponding to the SBRT plan.

[0019] In response to this, in the embodiment of the present invention, by moving the verification phantom to the position to be irradiated, the verification phantom can be irradiated at the position to be irradiated, avoiding a large gap between the received second dose and the actually received dose, which affects the accuracy of the dose verification result, thereby solving the problem of difficult to ensure accurate verification of the dose corresponding to the SBRT plan. The following will elaborate on this in detail.

[0020] Figure 1 It is a schematic structural diagram of an automatic dose verification system for radiotherapy provided by an embodiment of the present invention. This embodiment is applicable to the situation of dose verification, especially applicable to the situation of dose verification corresponding to stereotactic radiotherapy plans.

[0021] See Figure 1, the automatic dose verification system for radiotherapy according to the embodiments of the present invention includes: a first slide rail 110, a driving unit 120, a verification phantom 130, and an analysis unit 140; wherein,

[0022] The analysis unit 140 is configured to determine a first position of the irradiation position to be irradiated of the verification phantom 130 on the first slide rail 110, generate a driving instruction according to the first position, and send the driving instruction to the driving unit 120;

[0023] The driving unit 120 is configured to respond to the driving instruction, drive the verification phantom 130 to move to the first position on the first slide rail 110, so that the verification phantom 130 moves to the irradiation position to be irradiated corresponding to the first position, and the verification phantom 130 located at the irradiation position to be irradiated is irradiated with a first dose corresponding to the stereotactic radiotherapy plan;

[0024] The analysis unit 140 is further configured to obtain a second dose received by the verification phantom 130 at the irradiation position to be irradiated, and verify the second dose according to the first dose to obtain a dose verification result of the stereotactic radiotherapy plan.

[0025] Among them, the analysis unit 140 can be understood as a unit having functions such as analyzing the first position, generating a driving instruction, and obtaining a dose verification result; the analysis unit 140 can be, for example, a computer.

[0026] The first slide rail 110 can be understood as a slide rail on which the verification phantom 130 can slide.

[0027] The driving unit 120 can be understood as a unit for driving the verification phantom 130 to move.

[0028] The irradiation position to be irradiated can be understood as the position irradiated with a dose.

[0029] In the embodiments of the present invention, the number of irradiation positions to be irradiated can be at least one, that is, for example, when the number of irradiation positions to be irradiated is multiple, for each irradiation position to be irradiated, the first position of the irradiation position to be irradiated of the verification phantom 130 on the first slide rail 110 and subsequent steps are determined by the analysis unit 140, so as to realize automatic dose verification for multiple target areas waiting for irradiation positions.

[0030] In the embodiments of the present invention, the irradiation position to be irradiated can be determined in advance. The irradiation position to be irradiated can be determined according to, for example, the SBRT plan, or can be determined according to the target area of the target object corresponding to the SBRT plan, and so on.

[0031] The first position can be understood as the position corresponding to the irradiation position to be irradiated on the first slide rail 110. The first slide rail 110 is a slide rail parallel to the x-axis and corresponding to the y-axis coordinate of y2. For example, if the irradiation position on 110 is x1, then the coordinate of the first position is (x1, y2).

[0032] The driving instruction can be understood as an instruction for instructing the driving unit 120 to drive the verification phantom 130 to move.

[0033] In an embodiment of the present invention, the analysis unit 140 can determine a first position, generate a driving instruction according to the first position, and send the driving instruction to the driving unit 120.

[0034] The verification phantom 130 can be understood as a phantom for measuring the dose response corresponding to the SBRT plan to verify the SBRT plan.

[0035] The stereotactic radiotherapy plan can be understood as a plan for stereotactic radiotherapy.

[0036] The first dose can be understood as the irradiation dose corresponding to the SBRT plan; specifically, for example, the first dose can be understood as the radiation dose irradiated to the target area of the target object corresponding to the SBRT plan, and this target area can have a corresponding relationship with the position to be irradiated; the first dose can be a numerical quantification of the specific irradiation dose, and can also be the dose distribution irradiated to the position to be irradiated, and so on.

[0037] In an embodiment of the present invention, the driving unit 120 can respond to the driving instruction, drive the verification phantom 130 to move to the first position on the first slide rail 110, so that the verification phantom 130 moves to the position to be irradiated, and the verification phantom 130 located at the position to be irradiated is irradiated with the first dose.

[0038] Exemplarily, the driving unit 120 can respond to the driving instruction, drive the verification phantom 130 to move to the first position on the first slide rail 110, and then perform processes such as moving the first slide rail 110 so that the verification phantom 130 is located at the position to be irradiated, so that the verification phantom 130 moves to the position to be irradiated, and the verification phantom 130 located at the position to be irradiated is irradiated with the first dose.

[0039] In an embodiment of the present invention, the verification phantom 130, specifically, for example, the detection plate in the verification phantom 130, can measure the dose irradiated to the verification phantom 130 and use the measured dose as the second dose.

[0040] Among them, the second dose can be understood as the dose received by the verification phantom 130 at the position to be irradiated; the second dose can be a numerical quantification of the specifically received dose, and can also be the dose distribution recorded by the detection plate in the verification phantom 130, and so on.

[0041] It can be understood that although the verification phantom 130 is irradiated by the first dose, due to factors such as path loss, equipment calibration error, and environmental factors, the second dose may not be the same as the first dose. This is the reason why it is necessary to verify the second dose. That is, verifying the second dose can prevent the second dose actually irradiated to the target area from being too different from the first dose corresponding to the SBRT plan, which may affect the treatment and prognosis of the target object.

[0042] The dose verification result is the result obtained by verifying the second dose; the dose verification result can include, for example, the gamma index passing rate and / or whether the dose calibration passes, etc.

[0043] In the embodiment of the present invention, the verification phantom 130 detects the second dose and transmits it to the analysis unit 140. The analysis unit 140 verifies and analyzes the second dose according to the first dose to obtain the dose verification result.

[0044] Exemplarily, the second dose can represent the dose distribution measured by the detection plate in the verification phantom 130. According to the first dose, the second dose is analyzed by computer software to obtain the gamma index passing rate of the second dose. The accuracy of the second dose is evaluated according to the gamma index passing rate, and the obtained evaluation result is used as the dose verification result.

[0045] In the embodiment of the present invention, after obtaining the dose verification result, the dose verification result can also be displayed, so that medical staff can judge the dose accuracy of the second dose according to the dose verification result, for example, according to the dose verification passing rate in the dose verification result, and judge whether to perform subsequent treatment according to the SBRT plan according to the dose accuracy.

[0046] The technical solution of the embodiment of the present invention can automatically move the verification phantom 130 to the position to be irradiated, so that the verification phantom 130 is irradiated at the position to be irradiated, and the received second dose is verified by the first dose, which can achieve fully automatic reception and measurement of the dose and verification, reduce the error caused by fixing the phantom or manually moving the phantom, and thus make the measurement and verification of the dose simpler and more accurate.

[0047] In the technical solution of the embodiment of the present invention, through the analysis unit, the first position of the position to be irradiated of the verification phantom on the first slide rail is determined. According to the first position, a driving instruction is generated and sent to the driving unit, so that the driving unit can drive the verification phantom based on the driving instruction; through the driving unit, in response to the driving instruction, the verification phantom is driven to move to the first position on the first slide rail, so that the verification phantom moves to the position to be irradiated corresponding to the first position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan, so that the position where the verification phantom is irradiated is the position irradiated with the first dose; the analysis unit is further configured to obtain the second dose received by the verification phantom at the position to be irradiated, and verify the second dose according to the first dose to obtain the dose verification result of the stereotactic radiotherapy plan, thereby realizing the dose verification of the SBRT plan. In the above technical solution, by moving the verification phantom to the position to be irradiated, the verification phantom can be irradiated at the position to be irradiated, avoiding a large difference between the second dose received and the dose that should actually be received, which affects the accuracy of the dose verification result, thereby solving the problem that it is difficult to ensure the accurate verification of the dose corresponding to the SBRT plan.

[0048] An optional technical solution is that the verification phantom includes a first detection plate and a second detection plate; wherein, the driving unit is specifically configured to, in response to the driving instruction, drive the verification phantom to move to the first position on the first slide rail, so that the first detection plate and the second detection plate move to the position to be irradiated corresponding to the first position, and the first detection plate and the second detection plate located at the position to be irradiated are irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

[0049] Among them, both the first detection plate and the second detection plate are detection plates in the verification phantom; the first detection plate and the second detection plate can be located, for example, at the center position of the verification phantom or at a position that can represent the verification phantom, so that when the verification phantom moves to the first position, the first detection plate and the second detection plate can move to the position to be irradiated; for each of the first detection plate and the second detection plate, the probe pitch on the detection plate can be 1 mm, for example, which can meet the dose verification corresponding to most single-target SBRT plans; for each of the first detection plate and the second detection plate, the size of the detection plate can be 5 cm × 5 cm to reduce costs.

[0050] It can be understood that the measurement of the second dose received by the verification phantom at the position to be irradiated is realized through the detection plate in the verification phantom. Therefore, the driving unit can, in response to the driving instruction, drive the verification phantom to move to the first position on the first slide rail, so that the first detection plate and the second detection plate move to the position to be irradiated, and the first detection plate and the second detection plate are irradiated with the first dose.

[0051] In an embodiment of the present invention, the verification phantom includes a first detection plate and a second detection plate. The driving unit responds to a driving instruction and drives the verification phantom to move to a first position, so that the first detection plate and the second detection plate move to the position to be irradiated, enabling the first detection plate and the second detection plate capable of measuring the second dose to be irradiated by the first dose, thereby enabling an accurate second dose to be obtained.

[0052] Optionally, the first detection plate and the second detection plate are orthogonally placed.

[0053] In an embodiment of the present invention, the first detection plate and the second detection plate can be orthogonally placed, thereby enabling three-dimensional space dose verification using the smallest distribution of detection plate probes.

[0054] In an embodiment of the present invention, when the cost is sufficient, a third detection plate and a fourth detection plate can also be added, so that the first detection plate, the second detection plate, the third detection plate, and the fourth detection plate are distributed in a cross shape, increasing the accuracy and range of dose measurement. The size of the smallest measurement plate among the above-mentioned detection plates is, for example, 5×13 cm.

[0055] Compared with the two-dimensional plane dose verification in the related solution, the solution of the embodiment of the present invention can achieve automatic dose verification in three-dimensional space by orthogonally placing the first detection plate and the second detection plate, thereby ensuring accurate dose verification.

[0056] In another alternative technical solution, the verification phantom includes a detection phantom, a bracket slidably connected to a second part of a first slide rail, and a bracket nut connected between the bracket and the detection phantom. The distance between the bracket and the detection phantom is adjusted by adjusting the bracket nut, and the way of adjusting the bracket nut is determined by the target height corresponding to the stereotactic radiotherapy plan. The second slidable connection is realized by the first slide rail and a bracket slot on the bracket adapted to the first slide rail.

[0057] Among them, the detection phantom can be understood as the part of the verification phantom used to measure the dose response corresponding to the SBRT plan to verify the SBRT plan; the detection phantom can be a cylinder or a sphere, etc. For example, when the first detection plate and the second detection plate are orthogonally placed in the detection phantom, the detection phantom can be a cylinder.

[0058] The second slidable connection can be understood as the slidable connection between the first slide rail and the bracket, that is, the bracket can slide on the first slide rail.

[0059] The bracket can be understood as a bracket for supporting the detection phantom and movable on the first slide rail.

[0060] The bracket nut can be understood as a nut for connecting the bracket and the detection phantom.

[0061] The height of the target area can be understood as the target area to be irradiated with dose corresponding to the SBRT plan; for example, the height of the target area can be the height of the target area such as a tumor to be irradiated with dose of the target object relative to the bed board of the treatment bed when the target object lies flat on the treatment bed.

[0062] In an embodiment of the present invention, the verification phantom includes a detection phantom, a bracket, and a bracket nut; the bracket and the detection phantom are connected by the bracket nut; the bracket is secondarily slidably connected to the first slide rail, that is, the bracket can move on the first slide rail so that the detection phantom connected to the bracket can move on the first slide rail; the bracket may include a bracket slot adapted to the first slide rail so that the bracket slot is stuck on the first slide rail, specifically, it may be stuck on the phantom track of the first slide rail so that the bracket can move on the first slide rail, that is, the second sliding connection is realized through the first slide rail and the bracket slot.

[0063] The bracket slot can be understood as a slot on the bracket adapted to the first slide rail.

[0064] In an embodiment of the present invention, the way to adjust the bracket nut can be determined according to the height of the target area corresponding to the SBRT plan, and the bracket nut is adjusted according to the way to adjust the bracket nut so as to realize the adjustment of the distance between the bracket and the detection phantom.

[0065] In an embodiment of the present invention, the way to adjust the bracket nut can also be determined according to the pose of the first slide rail, where the pose can be understood as the position and attitude of the first slide rail.

[0066] Exemplarily, the number of the bracket nuts can be four, and the four corners of the bracket can be respectively connected to the four corners of the verification phantom through the bracket nuts. All four bracket nuts can be used to adjust the height of the verification phantom, that is, the height (the distance between the bracket and the detection phantom) of the verification phantom can be adjusted by rotating the bracket nuts. After the heights of all four bracket nuts are adjusted to be consistent, it can be measured and confirmed with a spirit level before dose verification.

[0067] It can be understood that since the height distribution of the target area may be relatively wide at the three-dimensional space level, in order to make the detection phantom closer to the actual situation, the way to adjust the bracket nut can be determined through the SBRT plan. For example, the higher the target area, the way to adjust the bracket nut is to select the bracket nut so that the distance between the bracket and the detection phantom is longer; and since the first slide rail may not be horizontally placed or placed as required, in order to ensure that the detection phantom meets the dose verification requirements, the way to adjust the bracket nut can be determined through the pose of the first slide rail; considering the above various situations, the way to adjust the bracket nut can be determined through at least one of the SBRT plan and the pose.

[0068] In an embodiment of the present invention, it may also be a method of determining the adjustment bracket nut based on at least one of an SBRT plan, the pose of the first slide rail, the pose of the second slide rail, the state of the treatment couch, and the object information of the target object, etc.

[0069] In an embodiment of the present invention, the adjustment of the distance between the bracket and the detection phantom can be achieved by adjusting the bracket nut. The method of adjusting the bracket nut is determined by the target area height corresponding to the SBRT plan. The second sliding connection is realized by the first slide rail and the bracket slot, which can enable the detection phantom to move on the first slide rail and make the distance between the bracket and the detection phantom adjustable, thereby improving the accurate verification of the dose.

[0070] Based on the above solution, in another alternative technical solution, the detection phantom is a cylinder, and the surface of the detection phantom includes three positioning lines. The positioning lines are used as the positioning reference lines of the stereotactic radiotherapy device, and the three positioning lines respectively correspond to three different directions.

[0071] Among them, the positioning line can be understood as the application as the positioning reference line of the stereotactic radiotherapy device; the three positioning lines respectively correspond to three different spatial directions. For example, the three positioning lines can be respectively located in the directions corresponding to the horizontal, vertical, and front-back faces of the detection phantom. For another example, the three positioning lines can be respectively located in the directions of the three coordinate axes corresponding to the world coordinate system on the detection phantom, etc.; it should be noted that the intersection point of the three positioning lines indicates the center of the phantom detection plate, that is, the center of the planned irradiation.

[0072] The stereotactic radiotherapy device can be understood as a device for performing the first dose irradiation, specifically, a device for performing SBRT radiation dose irradiation.

[0073] The positioning reference line can be understood as a reference line for indicating the positioning of the stereotactic radiotherapy device.

[0074] In an embodiment of the present invention, the detection phantom can be made into a cylinder, and the surface of the detection phantom includes three positioning lines. The three positioning lines respectively correspond to three different directions, so that after the verification phantom stops moving, it can be verified whether the position where the verification phantom is currently located is the first position or the position to be irradiated through the three positioning lines, that is, to verify the accuracy of the automatic positioning of the verification phantom, so as to avoid the first dose irradiation being performed when the verification phantom has not moved to the position to be irradiated, thereby realizing accurate first dose irradiation for the verification phantom.

[0075] Exemplarily, after the movement of the verification phantom stops, the analysis unit can verify whether the position where the verification phantom is currently located is the first position through three positioning lines. In the case where the verification phantom is not located at the first position, the analysis unit generates a new driving instruction and sends the new driving instruction to the driving unit, so that the driving unit drives the verification phantom to move to the first position on the first slide rail in response to the new driving instruction.

[0076] It should be noted that the mechanical error of the driving module should be controlled within 1 mm. If the mechanical error exceeds 1 mm, mechanical calibration is required to ensure the accuracy of the phantom movement. For example, it is verified through three positioning lines whether the gap between the position where the verification phantom is currently located and the first position or the position to be irradiated is within 1 mm. If it is not within 1 mm, mechanical calibration of the driving module can be performed; for another example, it is verified through three positioning lines whether the gap between the position where the verification phantom is currently located and the first position or the position to be irradiated is within 1 mm. If it is not within 1 mm, the analysis unit generates a new driving instruction, and the driving unit drives the verification phantom to move to the first position on the first slide rail in response to the new driving instruction, so that the verification phantom moves to the position to be irradiated corresponding to the first position, and then it is verified through three positioning lines whether the gap between the position where the verification phantom is currently located and the first position or the position to be irradiated is within 1 mm. If it is not within 1 mm, mechanical calibration of the driving module is performed.

[0077] In another alternative technical solution, the driving unit includes a motor, a transmission shaft connected to the motor, a lead screw assembly, and a positioning rod. The motor is connected to the transmission shaft, the transmission shaft is fixedly connected to the lead screw assembly, the lead screw assembly is sleeved with the positioning rod, and the positioning rod is sleeved with the verification phantom, so that the motor drives the lead screw assembly to rotate through the transmission shaft, and the lead screw assembly drives the verification phantom to move to the first position on the first slide rail through the positioning rod.

[0078] Among them, the motor can be understood as a motor used to drive the verification phantom to move on the first slide rail.

[0079] The transmission shaft can be understood as a component for transmitting the mechanical power of the motor to the lead screw assembly.

[0080] The lead screw assembly can be understood as a component that converts rotational motion into linear motion.

[0081] The positioning rod can be understood as a component used to guide and support the movement of the verification phantom on the first slide rail.

[0082] In an embodiment of the present invention, the driving unit may further include an encoder. The encoder is rotatably connected to the transmission shaft and is used to calculate the number of rotations of the transmission shaft, so as to obtain the motion state of the verification phantom in real time and return the motion state to the analysis unit. When the analysis unit determines that the verification phantom has moved to the position to be irradiated based on the motion state, a stop instruction is issued to stop the movement of the verification phantom. Or when the analysis unit determines that the verification phantom has stopped moving without reaching the position to be irradiated, an adjustment instruction is issued to adjust the position of the verification phantom to the position to be irradiated, etc., so as to achieve precise control of the movement of the verification phantom.

[0083] Exemplarily, the motor is located behind the phantom, the encoder is fixed on the motor and is rotatably connected to the transmission shaft. The transmission shaft is fixedly connected to the lead screw assembly. One end of the positioning rod is sleeved behind the verification phantom so that the positioning rod is connected to the bracket in the verification phantom. The other end of the positioning rod is fixedly sleeved on the nut of the lead screw assembly, so that the motor drives the lead screw assembly to rotate through the transmission shaft. The lead screw assembly drives the verification phantom to move on the first slide rail through the positioning rod. The encoder is also connected to the analysis unit to record the position of the nut of the lead screw assembly on the lead screw assembly, so as to locate the moving distance of the verification phantom.

[0084] In an embodiment of the present invention, the driving unit includes a motor, a transmission shaft connected to the motor, a lead screw assembly and a positioning rod. The motor is connected to the transmission shaft, the transmission shaft is fixedly connected to the lead screw assembly, the lead screw assembly is sleeved with the positioning rod, and the positioning rod is sleeved with the verification phantom, so that the motor drives the lead screw assembly to rotate through the transmission shaft. The lead screw assembly drives the verification phantom to move to the first position on the first slide rail through the positioning rod, so as to realize the movement of the verification phantom on the first slide rail.

[0085] Figure 2 FIG. is a schematic structural diagram of another automatic dose verification system for radiotherapy provided by an embodiment of the present invention. This embodiment is optimized based on the above technical solutions. In this embodiment, optionally, the automatic dose verification system for radiotherapy further includes: a second slide rail that is vertically placed and slidably connected to the first slide rail, wherein the slidable connection is realized by a convex track on the second slide rail and a concave card slot on the first slide rail that is adapted to the convex track; wherein, the analysis unit is specifically configured to determine the first position of the position to be irradiated of the verification phantom on the first slide rail, and determine the second position of the position to be irradiated on the second slide rail, generate a driving instruction according to the first position and the second position, and send the driving instruction to the driving unit; the driving unit is specifically configured to respond to the driving instruction, drive the first slide rail to move to the second position on the second slide rail, and drive the verification phantom to move to the first position on the first slide rail, so that the verification phantom moves to the position to be irradiated corresponding to the first position and the second position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

[0086] Among them, the explanations of the terms that are the same as or corresponding to those in the above embodiments will not be elaborated here.

[0087] Specifically, refer to Figure 2 , the automatic dose verification system for radiotherapy in this embodiment includes: a first slide rail 210, a driving unit 220, a verification phantom 230, an analysis unit 240, and a second slide rail 250 that is perpendicularly arranged to the first slide rail 210 and is slidably connected to the first slide rail 210. Among them, the slidable connection is realized by the raised track on the second slide rail 250 and the recessed card slot on the first slide rail 210 that is adapted to the raised track; among them,

[0088] The analysis unit 240 is specifically configured to determine the first position of the position to be irradiated of the verification phantom 230 on the first slide rail 210, and determine the second position of the position to be irradiated on the second slide rail 250. According to the first position and the second position, a driving instruction is generated and sent to the driving unit 220;

[0089] The driving unit 220 is specifically configured to respond to the driving instruction, drive the first slide rail 210 to move to the second position on the second slide rail 250, and drive the verification phantom 230 to move to the first position on the first slide rail 210, so that the verification phantom 230 moves to the position to be irradiated corresponding to the first position and the second position, and the verification phantom 230 located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan;

[0090] The analysis unit 240 is further configured to obtain the second dose received by the verification phantom 230 at the position to be irradiated, and verify the second dose according to the first dose to obtain the dose verification result of the stereotactic radiotherapy plan.

[0091] Among them, the slidable connection can be understood as the slidable connection between the first slide rail 210 and the second slide rail 250, that is, the first slide rail 210 can slide on the second slide rail 250.

[0092] The second slide rail 250 can be understood as a slide rail on which the first slide rail 210 can slide.

[0093] In the embodiment of the present invention, the second slide rail 250 can be perpendicularly arranged to the first slide rail 210 and is slidably connected to the first slide rail 210, which can enable the verification phantom 230 to finally move to the position to be irradiated by driving the first slide rail 210 to move to the second position and driving the verification phantom 230 to move to the first position.

[0094] The raised track can be understood as a raised track on the second slide rail 250 that enables the first slide rail 210 to slide on it.

[0095] The recessed card slot can be understood as a recessed card slot on the first slide rail 210 that is adapted to the raised track.

[0096] In an embodiment of the present invention, the first sliding connection can be achieved through a raised track and a recessed card slot. For example, the recessed card slot can be stuck on the raised track, so that the first slide rail 210 can slide on the second slide rail 250.

[0097] The second position can be understood as the position corresponding to the position to be irradiated on the second slide rail 250. For example, the coordinates of the second position are (x1, y1), and the second slide rail 250 is a slide rail parallel to the y-axis with an x-axis coordinate of x2. Then, the coordinates of the first position can be (x2, y1).

[0098] In an embodiment of the present invention, the analysis unit 240 can determine the first position and the second position, generate a driving instruction according to the first position and the second position, and send the driving instruction to the driving unit 220; the driving unit 220 can respond to the driving instruction, drive the first slide rail 210 to move to the second position on the second slide rail 250, and drive the verification phantom 230 to move to the first position on the first slide rail 210, so that the verification phantom 230 moves to the position to be irradiated, and the verification phantom 230 located at the position to be irradiated is irradiated with the first dose.

[0099] The technical solution of the embodiment of the present invention can drive the first slide rail to move to the second position and drive the verification phantom to move to the first position, so that the verification phantom can move to the position to be irradiated more accurately, and thus be irradiated at the position to be irradiated, thereby improving the accurate verification of the dose, and further solving the problem that it is difficult to ensure the accurate verification of the dose corresponding to the SBRT plan.

[0100] An alternative technical solution is that the first slide rail includes a phantom track; wherein, the driving unit is further specifically configured to respond to the driving instruction, drive the first slide rail to move to the second position on the raised track, and drive the verification phantom to move to the first position on the phantom track, so that the verification phantom moves to the position to be irradiated corresponding to the first position and the second position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

[0101] Among them, the phantom track can be understood as a raised track on the first slide rail that enables the verification phantom to slide thereon.

[0102] In an embodiment of the present invention, the driving unit can respond to a driving instruction to drive the first slide rail to move to a second position on the convex track and drive the verification module to move to a first position on the module track, so that the verification module moves to the position to be irradiated and the verification module located at the position to be irradiated is irradiated with a first dose. The above solution can realize the movement of the first slide rail and the verification module through the convex track and the module track, and further realize the movement of the verification module to the position to be irradiated.

[0103] In another alternative technical solution, the number of the first slide rails is at least two, the number of the second slide rails is at least two, and the number of the card slots of the concave card slots of each first slide rail is the same as the total number of the convex tracks of all the second slide rails.

[0104] Wherein, the number of the card slots can be understood as the number of the concave card slots corresponding to each first slide rail respectively.

[0105] The total number of the tracks can be understood as the total number of the convex tracks of all the second slide rails.

[0106] In an embodiment of the present invention, by making the number of the first slide rails be at least two, the number of the second slide rails be at least two, and the number of the card slots be the same as the total number of the tracks, it can be realized that the second slide rails and the first slide rails are vertically placed and each first slide rail can move on each second slide rail at the same time, so that the movement of the verification module and the first track can be more stable and not easily displaced.

[0107] In yet another alternative technical solution, the automatic dose verification system for radiotherapy further includes: a treatment couch fixedly connected to the second slide rail, wherein the fixed connection is realized through a positioning card slot on the treatment couch and a positioning protrusion on the second slide rail adapted to the positioning card slot.

[0108] Wherein, the treatment couch can be understood as a couch for SBRT technology treatment, and specifically, for example, it can be a couch for placing a verification module to perform dose verification of an SBRT plan through the verification module.

[0109] The positioning card slot can be understood as a card slot on the treatment couch for positioning and fixing the second slide rail.

[0110] The positioning protrusion can be understood as a protrusion on the second slide rail corresponding to the positioning card slot.

[0111] Exemplarily, the positioning protrusion can be fixed in the positioning card slot and fixed with screws to fixedly install the second slide rail in the positioning card slot reserved on the accelerator treatment couch.

[0112] In an embodiment of the present invention, when the first slide rail is parallel to the short axis of the treatment couch, the second slide rail can be parallel to the long axis of the treatment couch, and the positioning protrusions on both sides of the second slide rail can be fixedly connected to the positioning slots at the head and tail of the treatment couch; when the second slide rail is parallel to the short axis of the treatment couch, the first slide rail can be parallel to the long axis of the treatment couch, and the positioning protrusions on both sides of the second slide rail can be fixedly connected to the positioning slots on both sides of the treatment couch.

[0113] In an embodiment of the present invention, the second slide rail and the treatment couch are fixedly connected through the positioning slots and the positioning protrusions, which can make the environment of dose verification closer to the actual treatment environment and ensure the stability of the second slide rail.

[0114] To better understand the technical solutions of the above embodiments of the present invention, an optional example is provided here. Exemplarily, the number of the first slide rails is two, and the number of the second slide rails is three; the first slide rail includes a first bracket and a phantom rail, and the second slide rail includes a second bracket and a protrusion rail; the three second slide rails are horizontally placed through the corresponding second brackets respectively, and the three second slide rails are respectively placed in the positioning slots to fixedly connect the three second slide rails to the treatment couch; the two first slide rails are vertically placed in the middle of the treatment couch through the corresponding first brackets respectively, and the hole-shaped recessed slots corresponding to the two first slide rails are stuck on the protrusion rails, and screws are used for fixing the first sliding connection; the verification phantom is located above the phantom rail, and the phantom rail is secondarily slidably connected to the verification phantom.

[0115] The above specific implementation manners do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic dose verification system for radiotherapy, characterized in that: include: A first slide rail, a driving unit, a verification phantom, and an analysis unit; wherein, The analyzing unit is used to determine a first position of the verification phantom to be irradiated on the first slide rail, generate a driving instruction according to the first position, and send the driving instruction to the driving unit; The driving unit is used for driving the verification phantom to move to the first position on the first slide rail in response to the driving instruction, so that the verification phantom moves to the position to be irradiated corresponding to the first position, and the verification phantom located at the position to be irradiated is irradiated with a first dose corresponding to the stereotactic radiotherapy plan; The analysis unit is further used to obtain a second dose received by the verification phantom at the position to be irradiated, and verify the second dose according to the first dose to obtain a dose verification result of the stereotactic radiotherapy plan.

2. The system according to claim 1, characterized in that Also includes: A second slide rail placed vertically with the first slide rail and in first sliding connection, wherein the first sliding connection is achieved by a raised track on the second slide rail and a recessed slot on the first slide rail adapted to the raised track; wherein, The analysis unit is specifically used to determine a first position of the position to be irradiated of the verification phantom on the first slide rail, and to determine a second position of the position to be irradiated on the second slide rail, generate a driving instruction according to the first position and the second position, and send the driving instruction to the driving unit; The driving unit is specifically used to drive the first slide rail to move to the second position on the second slide rail and drive the verification phantom to move to the first position on the first slide rail in response to the driving instruction, so that the verification phantom moves to the position to be irradiated corresponding to the first position and the second position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

3. The system according to claim 2, characterized in that The first slide rail comprises a mold body track; wherein, The driving unit is further specifically used to drive the first slide rail to move to the second position on the raised track and drive the verification phantom to move to the first position on the phantom track in response to the driving instruction, so that the verification phantom moves to the position to be irradiated corresponding to the first position and the second position, and the verification phantom located at the position to be irradiated is irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

4. The system according to claim 2, wherein the number of the first slide rails is at least two, the number of the second slide rails is at least two, and the number of recessed slots of each of the first slide rails is the same as the total number of raised tracks of all the second slide rails.

5. The system according to claim 2, characterized in that Also includes: A treatment bed fixedly connected to the second slide rail, wherein the fixed connection is achieved by a positioning slot on the treatment bed and a positioning protrusion on the second slide rail that is adapted to the positioning slot.

6. The system according to claim 1, characterized in that The verification model includes a first detection plate and a second detection plate; wherein, The driving unit is used to drive the verification phantom to move to the first position on the first slide rail in specific response to the driving instruction, so that the first detection plate and the second detection plate move to the position to be irradiated corresponding to the first position, and the first detection plate and the second detection plate located at the position to be irradiated are irradiated with the first dose corresponding to the stereotactic radiotherapy plan.

7. The system according to claim 6, characterized in that The first detection plate and the second detection plate are placed orthogonally.

8. The system according to claim 1, characterized in that The verification phantom includes a detection phantom, a bracket connected to the first slide rail for a second sliding connection, and a bracket nut connected between the bracket and the detection phantom, wherein the distance adjustment between the bracket and the detection phantom is achieved by adjusting the bracket nut, the manner of adjusting the bracket nut is determined by the target area height corresponding to the stereotactic radiotherapy plan, and the second sliding connection is achieved by the first slide rail and a bracket slot on the bracket that is adapted to the first slide rail.

9. The system according to claim 8, characterized in that The detection phantom is a cylinder, and the surface of the detection phantom includes three positioning lines. The positioning lines are used as positioning reference lines of a stereotactic radiotherapy device, and the three positioning lines correspond to three different directions respectively.

10. The system according to claim 1, characterized in that The driving unit includes a motor, a transmission shaft connected to the motor, a screw assembly and a positioning rod, the motor is connected to the transmission shaft, the transmission shaft is fixedly connected to the screw assembly, the screw assembly is sleeved with the positioning rod, and the positioning rod is sleeved with the verification mold, so that the motor drives the screw assembly to rotate through the transmission shaft, and the screw assembly drives the verification mold to move to the first position on the first slide rail through the positioning rod.

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