An automatic positioning device for verifying spiral tomotherapy plans

Abstract

The present invention relates to the field of medical device technology, and discloses an automatic positioning device for verifying a spiral tomographic radiotherapy plan, comprising a base, which is located on a treatment bed of a spiral tomographic radiotherapy device; a lifting platform, which is fixedly connected to the top of the base, and a bearing platform is fixedly connected to the top of the lifting platform, and a mobile platform is arranged on the bearing platform, and one end of two support rods is fixedly connected to the side of the mobile platform close to the treatment bed; a three-dimensional verification phantom, which is fixedly connected to the other end of the two support rods, and the three-dimensional verification phantom extends into the treatment aperture through the mobile platform; an early warning component, which comprises two early warning parts, which are respectively arranged on the two support rods, and the early warning parts are aligned with the circuit of the three-dimensional verification phantom to monitor the radiation dose received by the circuit of the three-dimensional verification phantom. The present invention has a simple structure and is easy to adjust. When applied to verifying a spiral tomographic radiotherapy plan, it is not necessary to manually position the three-dimensional verification phantom, so as to ensure effective measurement of the prescription dose area of ​​the actual treatment plan and the accuracy of the measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an automatic positioning device for verifying a spiral tomotherapy plan. Background Art

[0002] The spiral tomotherapy system (TOMO Therapy) integrates IMRT (intensity modulated radiotherapy), IGRT (image-guided intensity modulated radiotherapy), and DGRT (dose-guided intensity modulated radiotherapy). It is the world's cutting-edge tumor radiotherapy equipment. Its original design uses spiral CT rotation scanning, combined with computer tomography image navigation adjustment, to break through the many limitations of traditional accelerators. Under the guidance of CT, 360-degree focused tomography irradiates tumors, providing efficient, accurate, and safe treatment for patients with malignant tumors. Before the implementation of spiral tomotherapy, it is necessary to verify the dose of the radiotherapy plan for individual patients, that is, to use a three-dimensional dose verification tool to measure the patient's plan to ensure that the designed radiotherapy plan is consistent with the actual irradiation dose, thereby ensuring the safety and accuracy of the irradiation. At present, ArcCheck or Delta4 3D dose verification phantoms are mainly used in clinical practice to verify spiral tomography plans, but there are the following problems in the work: 1. The position of the 3D dose verification phantom is fixed when verifying conventional IMRT or VMAT intensity-modulated plans. When verifying the treatment plans of multiple patients, only one positioning is required, that is, the center line marked on the surface of the cylindrical 3D dose verification phantom is aligned with the center of the field. The center of the field is the center of the laser light, because conventional linear accelerators have only one set of laser light systems, and the center position is fixed. The spiral tomography equipment has two sets of laser lights, namely red laser lights and green laser lights. The green laser light is fixed in position, indicating the center of the virtual field, while the red laser light can be moved for different patients' radiotherapy plans. When verifying the spiral tomography plan, the center position of the red laser light, that is, the position of the three-dimensional verification phantom corresponding to each patient, is different. In other words, every time a radiotherapy plan is verified, the physicist needs to enter the machine room and reposition the three-dimensional verification phantom according to the position of the red laser light corresponding to the patient's radiotherapy plan, that is, move the treatment bed in the lifting, left and right, and forward and backward directions. This process is time-consuming, the plan verification efficiency is low, and the insufficient positioning accuracy affects the pass rate of the plan verification. 2. In the dose verification of the previous spiral tomography plan, the treatment bed was the direct carrier of the three-dimensional verification phantom. When using a 3D dose verification phantom to generate a patient verification plan, it is necessary to move the position of the red laser light, that is, to find a suitable positioning center point to effectively measure the prescription dose area of ​​the actual treatment plan. However, when the tumor position is eccentrically distributed, the positioning center of the 3D dose verification phantom will be offset in the X-coordinate direction, that is, the left and right directions. When the offset exceeds a certain range, the left and right movement range of the treatment bed is limited (only 2.5 cm) due to the aperture size limitation, which will cause the positioning of the 3D verification phantom to be biased toward one side of the treatment bed during the plan verification of the eccentric tumor. At this time, the phantom is at risk of falling. In severe cases, it cannot be positioned smoothly, and the prescription dose area of ​​the actual treatment plan cannot be effectively measured.3. Compared with conventional linear accelerators, TOMO has obvious advantages for multiple lesions throughout the body or "long" tumors such as whole-center radiotherapy. However, when verifying radiotherapy plans for long tumors, we often face the following problem: the effective measurement length of the three-dimensional dose verification phantom is only 20-30cm, and high-energy rays often irradiate the circuit board part of the verification equipment, causing the circuit board to not work properly. In mild cases, the dose measurement is inaccurate, and in severe cases, it will cause verification equipment failure, resulting in economic losses. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic positioning device for spiral tomotherapy plan verification to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides an automatic positioning device for verifying a helical tomotherapy plan, comprising:

[0005] A base, located on the treatment bed of the helical tomotherapy device;

[0006] A lifting platform, fixedly connected to the top of the base, a bearing platform fixedly connected to the top of the lifting platform, a mobile platform arranged on the bearing platform, and one end of two support rods fixedly connected to the side of the mobile platform close to the treatment bed;

[0007] A three-dimensional verification phantom is fixedly connected to the other ends of the two support rods, and the three-dimensional verification phantom extends into the treatment aperture through the mobile platform;

[0008] The early warning component comprises two early warning parts, which are respectively arranged on the two support rods. The early warning parts are aligned with the circuit of the three-dimensional verification phantom to monitor the radiation dose received by the circuit of the three-dimensional verification phantom.

[0009] Preferably, the warning component includes a sleeve, the sleeve is sleeved on the support rod and is slidably connected to the support rod, an ionization chamber is arranged in the sleeve, and the ionization chamber is used to monitor the irradiation threshold of the radiation.

[0010] Preferably, the lifting platform is a scissor-type lifting platform, and a plurality of metal sleeves are arranged on the outer side of the lifting platform, and the plurality of metal sleeves are arranged layer by layer.

[0011] Preferably, the mobile platform is a dual-axis mobile platform.

[0012] Preferably, the sleeve is an equivalent water material sleeve.

[0013] Preferably, a counterweight is fixedly connected to one end of the bearing platform away from the treatment aperture.

[0014] Preferably, through holes are provided at the four corners of the bottom end of the base, and support nuts are threadedly connected to the through holes.

[0015] Preferably, a positioning bolt is threadedly connected to the sleeve, and one end of the positioning bolt passes through the sleeve and contacts the support rod.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The present invention provides an automatic positioning device for verifying a spiral tomography radiotherapy plan. The base can be adjusted on the treatment bed. The lifting platform and the mobile platform are combined to realize the movement of the three-axis of the three-dimensional verification phantom, thereby realizing the adjustment of its position, ensuring the effective measurement of the prescription dose area of ​​the actual treatment plan, and the alarm is realized when the three-dimensional verification phantom circuit contacts high-energy rays through the set early warning component, ensuring the normal operation of the circuit board, thereby ensuring accurate measurement. The present application has a simple structure and is easy to adjust, ensuring the effective measurement of the prescription dose area of ​​the actual treatment plan and accurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Among them, 1. base; 2. treatment bed; 3. lifting platform; 4. load-bearing platform; 5. mobile platform; 6. support rod; 7. sleeve; 8. metal sleeve; 9. treatment aperture; 10. counterweight block; 11. three-dimensional verification model; 12. support nut. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1The present invention provides an automatic positioning device for verifying a helical tomotherapy plan, comprising:

[0024] A base 1 is located on a treatment bed 2 of a spiral tomography radiotherapy device;

[0025] The lifting platform 3 is fixedly connected to the top of the base 1, the top of the lifting platform 3 is fixedly connected to a bearing platform 4, a moving platform 5 is arranged on the bearing platform 4, and one end of two supporting rods 6 is fixedly connected to the side of the moving platform 5 close to the treatment bed 2;

[0026] The three-dimensional verification phantom 11 is fixedly connected to the other ends of the two support rods 6, and the three-dimensional verification phantom 11 extends into the treatment aperture 9 through the mobile platform 5;

[0027] The early warning component includes two early warning parts, which are respectively arranged on the two support rods 6 . The early warning parts are aligned with the circuit of the three-dimensional verification phantom 11 to monitor the circuit of the three-dimensional verification phantom 11 .

[0028] In one embodiment of the present invention, the scenario in which the device is used is: the treatment bed 2 serves as a carrier of the device, and the relative positions of the two remain unchanged. The device serves as a carrier of the three-dimensional verification phantom 11. For different patients, the three-dimensional verification phantom 11 will move to different positions based on the settings of its radiotherapy plan. It should be noted that during the positioning stage, the three-dimensional verification phantom 11 will not enter the treatment aperture 9 of the radiotherapy device, and when the radiotherapy device emits a beam, that is, during plan verification, the treatment bed 2 will enter the treatment aperture 9, and then the device and the three-dimensional verification phantom 11 will also enter the treatment aperture 9 for dose measurement. During the implementation of the plan verification, that is, during the beam emission of the radiotherapy device, the relative positions of the treatment bed 2, the device, and the three-dimensional verification phantom 11 remain unchanged.

[0029] According to a further optimized solution, the early warning component includes a sleeve 7, which is sleeved on the support rod 6 and slidably connected to the support rod 6. An ionization chamber is arranged in the sleeve 7, and the ionization chamber is used to monitor the irradiation threshold of the radiation.

[0030] In one embodiment of the present invention, the sleeve 7 contains an ionization chamber that can monitor high-energy rays. When the ionization chamber is irradiated by high-energy rays, the dosage information can be sent to the control computer. The position of the sleeve 7 is adjustable in the cross section, that is, in the direction of advancing and retreating the bed, and can be aligned with the circuit of the three-dimensional verification phantom 11 to monitor whether high-energy rays irradiate the ionization chamber and the circuit part of the three-dimensional verification phantom 11. When the high-energy rays irradiate the circuit part, that is, the ionization chamber part is irradiated by the rays, and the ionization chamber monitors that the radiation exposure reaches a threshold, the control computer can issue an alarm. At the same time, when the cumulative dose monitored subsequently reaches a second threshold, the three-dimensional verification phantom 11 can be automatically controlled to move out.

[0031] According to a further optimization scheme, the lifting platform 3 is a scissor-type lifting platform, and a plurality of metal sleeves 8 are arranged on the outer side of the lifting platform 3, and the plurality of metal sleeves 8 are arranged layer by layer.

[0032] In one embodiment of the present invention, the lifting platform is a scissor-type lifting platform, and a plurality of metal sleeves 8 are sleeved on the outside to achieve sheathing.

[0033] According to a further optimization scheme, the mobile platform 5 is a dual-axis mobile platform.

[0034] In one embodiment of the present invention, the mobile platform 5 is a dual-axis mobile platform, that is, an X-axis and Y-axis mobile platform. The mobile platform is driven by a set screw to move horizontally and vertically, thereby driving the three-dimensional verification model 11 to move horizontally and vertically, and cooperating with the lifting platform 3 to realize the movement of the three-dimensional verification model 11 in the X, Y, and Z three-axis directions.

[0035] According to a further optimization scheme, the sleeve 7 is an equivalent water material sleeve.

[0036] According to a further optimized solution, a counterweight 10 is fixedly connected to one end of the carrying platform 4 away from the treatment aperture 9 .

[0037] The counterweight 10 is located at the rear end of the overall structure to ensure the balance of the overall structure.

[0038] According to a further optimized solution, through holes are provided at the four corners of the bottom end of the base 1, and support nuts 12 are threadedly connected to the through holes.

[0039] The support nut 12 can be rotated, thereby enabling the four corners of the base 1 to be raised or lowered, and the base 1 can be adjusted horizontally by rotating the support nut 12 .

[0040] According to a further optimized solution, a positioning bolt is threadedly connected to the sleeve 7 , and one end of the positioning bolt passes through the sleeve 7 and contacts the support rod 6 .

[0041] By screwing the positioning bolts to contact the support rod 6, the sleeve 7 is limited to ensure its stability when it is aligned with the circuit of the three-dimensional verification model 11.

[0042] The present invention provides an automatic positioning device for verifying a spiral tomography radiotherapy plan. When in use, first fix the three-dimensional verification phantom 11 on the support rod 6, and move the sleeve 7 so that the position of the ionization chamber is consistent with the circuit board part of the three-dimensional verification phantom 11 in the cross section, move the red laser light of the TOMO device to a certain position, the spatial coordinates are X', Y', Z', and position is performed based on the red laser according to the scale lines on the base 1 of the device. This position is used as the initial isocenter position of the three-dimensional verification phantom 11, and the spatial coordinates are 0,0,0. At this time, the positioning mark line of the three-dimensional verification phantom 11 is aligned with the green laser, the spatial coordinates are 0,0,0, and the center coordinates of the mobile platform 5 are X0, Y0, Z0. At this point, the relative spatial positions of the three-dimensional verification phantom 11, the base 1 of the device, the mobile platform 5, and the TOMO virtual field center are all determined.

[0043] After the positioning is completed, the radiotherapy plan verification of a certain patient begins. First, the verification plan data, especially the red laser light coordinate data, is transmitted to the control computer. The control computer converts the red laser light coordinate data X1, Y1, Z1, that is, the target coordinate data of the three-dimensional verification phantom 11 into the left and right movement data X1' and the forward and backward movement data Y1' of the mobile platform 5, as well as the height data Z1' of the lifting platform 3, and then controls the mobile platform 5 and the lifting platform 3 to reach the predetermined target position X1', Y1', Z1'. At this time, the marking line of the three-dimensional verification phantom 11 positioning corresponds to the corresponding position X1, Y1, Z1 of the red laser light. At this point, the three-dimensional verification phantom 11 positioning work of the patient verification plan is automatically completed. With the implementation of the verification plan, the treatment bed is constantly moving in. When the high-energy radiation irradiates the circuit part, that is, the ionization chamber part is irradiated, and the ionization chamber detects that the radiation irradiation reaches the threshold, the control computer immediately issues an early warning to remind the physicist. If the radiation does not stop emitting beams and the accumulated dose monitored by the ionization chamber reaches the second threshold, the mobile platform 5 is automatically driven to move in the direction of retreating the bed, exit the TOMO treatment aperture, and automatically avoid further irradiation of radiation to prevent possible circuit damage.

[0044] When the device is used as a carrier of the TOMO radiotherapy three-dimensional dose verification phantom 11 for dose verification, the three-dimensional dose verification phantom has a larger measurement range in the left and right directions, which is advantageous for verifying the radiotherapy plan of eccentric tumors.

[0045] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An automatic positioning device for verifying a helical tomotherapy plan, characterized in that: include: A base (1) is located on a treatment bed (2) of a helical tomographic radiotherapy device; A lifting platform (3) is fixedly connected to the top of the base (1); a bearing platform (4) is fixedly connected to the top of the lifting platform (3); a moving platform (5) is arranged on the bearing platform (4); and one end of two supporting rods (6) is fixedly connected to a side of the moving platform (5) close to the treatment bed (2); A three-dimensional verification phantom (11) is fixedly connected to the other ends of the two support rods (6), and the three-dimensional verification phantom (11) extends into the treatment aperture (9) through the mobile platform (5); An early warning component, comprising two early warning parts, the two early warning parts being respectively arranged on the two support rods (6), the early warning parts being aligned with the circuit of the three-dimensional verification phantom (11) for monitoring the radiation dose received by the circuit of the three-dimensional verification phantom (11); The early warning component comprises a sleeve (7), the sleeve (7) is sleeved on the support rod (6) and is slidably connected to the support rod (6), an ionization chamber is arranged in the sleeve (7), and the ionization chamber is used to monitor the irradiation threshold of the radiation; When in use, the position of the ionization chamber is kept consistent with the circuit board portion of the three-dimensional verification phantom (11) in the cross section, the red laser light of the mobile TOMO device reaches a certain position, the spatial coordinates are X', Y', Z', and the positioning is performed based on the red laser according to the scale lines on the base (1) of the device. The initial isocenter position spatial coordinates of the three-dimensional verification phantom (11) are 0,0,0. At this time, the positioning mark line of the three-dimensional verification phantom (11) is aligned with the green laser, the spatial coordinates are 0,0,0, and the center coordinates of the mobile platform (5) are X 0, Y 0, Z 0; The coordinate data of the red laser light is transmitted to the control computer. The control computer converts the coordinate data of the red laser light as X1, Y1, Z1, i.e., the target coordinate data of the three-dimensional verification model (11), into the left and right movement data X1' and the forward and backward movement data Y1' of the mobile platform (5), as well as the height data Z1' of the lifting platform (3). Then, the mobile platform (5) and the lifting platform (3) are controlled to reach the predetermined target position X1', Y1', Z1'. At this time, the marking line of the three-dimensional verification model (11) corresponds to the corresponding position X1, Y1, Z1 of the red laser light. With the implementation of the verification plan, the treatment bed is continuously moved into the bed. When the high-energy radiation irradiates the circuit part, i.e., the ionization chamber part, and is irradiated by the radiation, the ionization chamber monitors that the radiation irradiation reaches the threshold value, the control computer immediately issues an early warning to remind the physicist. If the radiation does not stop emitting beams and the cumulative dose monitored by the ionization chamber reaches the second threshold value, the mobile platform (5) is automatically driven to move in the direction of retreating the bed and exit the TOMO treatment aperture.

2. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: The lifting platform (3) is a scissor-type lifting platform. A plurality of metal sleeves (8) are arranged on the outside of the lifting platform (3), and the plurality of metal sleeves (8) are sleeved layer by layer.

3. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: The mobile platform (5) is a dual-axis mobile platform.

4. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: The sleeve (7) is an equivalent water material sleeve.

5. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: A counterweight (10) is fixedly connected to one end of the bearing platform (4) away from the treatment aperture (9).

6. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: Through holes are provided at the four corners of the bottom end of the base (1), and support nuts (12) are threadedly connected to the through holes.

7. The automatic positioning device for spiral tomotherapy plan verification according to claim 1, characterized in that: A positioning bolt is threadedly connected to the sleeve (7), and one end of the positioning bolt passes through the sleeve (7) and contacts the support rod (6).

Images