Automatic positioning apparatus for verification of spiral tomographic radiotherapy plan

Abstract

The present invention relates to the technical field of medical instruments. Disclosed is an automatic positioning apparatus for verification of a spiral tomographic radiotherapy plan, comprising: a base, located on a treatment bed of a spiral tomographic radiotherapy device; a lifting platform, fixedly connected to the top end of the base, wherein the top end of the lifting platform is fixedly connected to a bearing platform, a moving platform is arranged on the bearing platform, and the side of the moving platform close to the treatment bed is fixedly connected to one end of each of two support rods; a three-dimensional verification phantom, fixedly connected to the other ends of the two support rods, wherein the three-dimensional verification phantom extends into a treatment aperture by means of the moving platform; and an early warning assembly, comprising two early warning members, wherein the two early warning members are arranged on the two support rods, respectively, and the early warning members are aligned with a circuit of the three-dimensional verification phantom and configured for monitoring an irradiation dose received by the circuit of the three-dimensional verification phantom. The present invention has a simple structure, is convenient to adjust, eliminates the need to manually position a three-dimensional verification phantom when applied to verification of a spiral tomographic radiotherapy plan, and ensures that a prescribed dose area of an actual treatment plan is effectively measured with accuracy.

Description

An automatic positioning device for helical tomotherapy plan verification TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and particularly relates to an automatic positioning device for helical tomotherapy plan verification. BACKGROUND

[0002] TOMO Therapy, which integrates IMRT (intensity modulated radiotherapy), IGRT (image-guided intensity modulated radiotherapy) and DGRT (dose-guided intensity modulated radiotherapy), is a world-class tumor radiotherapy device. Its innovative design uses spiral CT rotation scanning combined with computer tomographic image navigation adjustment to break through many limitations of traditional accelerators. Under CT guidance, it focuses on tomographic irradiation of tumors at 360 degrees to provide efficient, accurate and safe treatment for patients with malignant tumors. Before the implementation of spiral tomotherapy, the individualized radiotherapy plan of the patient needs to be verified in terms of dose, that is, a three-dimensional dose verification tool is used 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 irradiation. Currently, ArcCheck or Delta4 three-dimensional dose three-dimensional verification phantom is mainly used for spiral tomotherapy plan verification in clinical practice, but there are the following problems in work: 1. The position of the three-dimensional dose three-dimensional verification phantom is fixed during the verification of conventional IMRT or VMAT intensity modulated plan, and the center line marked on the surface of the cylindrical three-dimensional dose three-dimensional verification phantom is aligned with the field center, that is, the laser center. Because the conventional linear accelerator has only one set of laser light system, the isocenter position is fixed. However, the spiral tomotherapy device has two sets of laser light, namely red laser light and green laser light. The position of the green laser light is fixed, indicating the virtual field center, while the position of the red laser light can be moved for different patients' radiotherapy plans. During spiral tomotherapy plan verification, the position of the red laser light center, that is, the position of the three-dimensional verification phantom corresponding to each patient, is different. That is, 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 during the verification of each radiotherapy plan, that is, to move the treatment bed from the lifting, left and right and advancing and retreating directions. This process is time-consuming, the plan verification efficiency is low, and the positioning accuracy is not enough, which affects the passing rate of plan verification. 2. During the dose verification of the previous spiral tomotherapy plan, the treatment bed is the direct carrier of the three-dimensional verification phantom. When generating the verification plan of the patient using the three-dimensional dose three-dimensional verification phantom, the position of the red laser light needs to be moved, that is, a suitable center point needs to be found to effectively measure the prescription dose area of the actual treatment plan. However, when the tumor position is eccentrically distributed, the center of the three-dimensional dose three-dimensional verification phantom will deviate in the X coordinate direction, that is, the left and right directions. When the deviation exceeds a certain range, the left and right movement range of the treatment bed is limited due to the size of the aperture (only 2.5 cm), which will cause the three-dimensional verification phantom to deviate to one side of the treatment bed during the plan verification of the eccentric tumor. At this time, the phantom has a risk of falling, and in serious cases, it cannot be successfully positioned and cannot effectively measure the prescription dose area of the actual treatment plan.3、Compared with the conventional linear accelerator, the TOMO has obvious advantages for whole body multiple lesions or "long" tumors such as whole central nervous system radiotherapy, however, in the long tumor radiotherapy plan verification, there is often a problem that the effective measurement length of the three-dimensional dose three-dimensional verification phantom is only 20-30cm, and the high-energy rays often irradiate the circuit board part of the verification device, causing the circuit board to not work normally, and the dose measurement is inaccurate, and the verification device is even faulty, causing economic loss.

[0003] SUMMARY

[0004] The purpose of the present application is to provide an automatic positioning device for helical tomotherapy plan verification to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the present application provides the following scheme: the present application provides an automatic positioning device for helical tomotherapy plan verification, comprising:

[0006] a base located on a treatment bed of a helical tomotherapy device;

[0007] a lifting platform fixedly connected to the top end of the base, a bearing platform fixedly connected to the top end of the lifting platform, a moving platform provided on the bearing platform, and one end of two support rods fixedly connected to the side of the moving platform close to the treatment bed;

[0008] a three-dimensional verification phantom fixedly connected to the other end of the two support rods, the three-dimensional verification phantom extending into the treatment aperture through the moving platform;

[0009] a warning component including two warning pieces, the two warning pieces being respectively provided on the two support rods, and the warning piece being aligned with the circuit of the three-dimensional verification phantom for monitoring the radiation dose received by the circuit of the three-dimensional verification phantom.

[0010] Preferably, the warning piece includes a sleeve, the sleeve being sleeved on the support rod and being in sliding connection with the support rod, an ionization chamber being provided in the sleeve, and the ionization chamber being used for monitoring the irradiation threshold of the rays.

[0011] Preferably, the lifting platform is a scissor lifting platform, a plurality of metal sleeves being provided on the outer side of the lifting platform, and the plurality of metal sleeves being sleeved layer by layer.

[0012] Preferably, the moving platform is a double-shaft moving platform.

[0013] Preferably, the sleeve is an equivalent water material sleeve.

[0014] Preferably, a counterweight is fixedly connected to the end of the bearing platform away from the treatment aperture.

[0015] Preferably, a through hole is formed in each of the four corners of the bottom end of the base, and a support nut is threadedly connected in the through hole.

[0016] Preferably, a positioning bolt is threadedly connected to the sleeve, and one end of the positioning bolt penetrates through the sleeve and contacts the support rod.

[0017] Compared with the prior art, the present application has the following advantages and technical effects:

[0018] The present application provides an automatic positioning device for helical tomotherapy plan verification, the base is adjustable on the treatment bed, the lifting table and the moving platform are combined to realize the movement of the three-axis of the three-dimensional verification phantom, thereby realizing the adjustment of the position, ensuring the effective measurement of the prescription dose area of the actual treatment plan, the pre-warning component is provided to realize the alarm when the three-dimensional verification phantom circuit contacts the high-energy rays, ensuring the normal work of the circuit board, thereby ensuring the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor:

[0020] Fig. 1 is a schematic diagram of the overall structure of the present application;

[0021] Among them, 1, base; 2, treatment bed; 3, lifting table; 4, bearing platform; 5, moving platform; 6, support rod; 7, sleeve; 8, metal sleeve; 9, treatment aperture; 10, counterweight; 11, three-dimensional verification phantom; 12, support nut. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Referring to Fig. 1, the present application provides an automatic positioning device for helical tomotherapy plan verification, comprising:

[0025] Base 1, located on the treatment bed 2 of the helical tomotherapy device;

[0026] Lifting platform 3 is fixedly connected to the top end of the base 1, and the top end of the lifting platform 3 is fixedly connected with a bearing platform 4, and the bearing platform 4 is provided with a moving platform 5, and one end of two support rods 6 fixedly connected with the side close to the treatment bed 2 is arranged on the moving platform 5;

[0027] Three-dimensional verification phantom 11 is fixedly connected to the other end of the two support rods 6, and the three-dimensional verification phantom 11 extends into the treatment aperture 9 through the moving platform 5;

[0028] The early warning assembly comprises two early warning components, and the two early warning components are arranged on the two support rods 6 respectively, and the early warning component is aligned with the circuit of the three-dimensional verification phantom 11 for monitoring the circuit of the three-dimensional verification phantom 11.

[0029] In an embodiment of the present application, the scene of the device in use is that the treatment bed 2 serves as the carrier of the device, and the relative position of the two is unchanged, and the device serves as the carrier of the three-dimensional verification phantom 11, and the three-dimensional verification phantom 11 will move to different positions based on the setting of the radiotherapy plan for different patients. It should be noted that in the positioning stage, the three-dimensional verification phantom 11 will not enter the inside of the treatment aperture 9 of the radiotherapy device, and when the radiotherapy device emits a beam, that is, during the implementation of the plan verification, the treatment bed 2 will enter the treatment aperture 9, and then the device and the three-dimensional verification phantom 11 also enter the treatment aperture 9 for dose measurement, and the relative positions of the treatment bed 2, the device and the three-dimensional verification phantom 11 are unchanged during the implementation of the plan verification, that is, during the emission of the beam of the radiotherapy device.

[0030] Further optimization scheme, the early warning component comprises a sleeve 7, the sleeve 7 is sleeved on the support rod 6 and is in sliding connection with the support rod 6, and an ionization chamber is arranged in the sleeve 7, and the ionization chamber is used for monitoring the irradiation threshold of the ray.

[0031] In an embodiment of the present application, the sleeve 7 contains an ionization chamber capable of monitoring high-energy rays inside, the ionization chamber is irradiated by high-energy rays, and the dose information can be sent to the control computer, the position of the sleeve 7 is adjustable in the transverse direction, that is, the direction of the advancing bed, and the sleeve 7 can be aligned with the circuit of the three-dimensional verification phantom 11 in order to monitor whether the 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 rays irradiate to reach the threshold value, the control computer can issue an alarm, and when the cumulative dose of the subsequent monitoring reaches a second threshold value, the three-dimensional verification phantom 11 can be automatically controlled to move out.

[0032] Further optimization scheme, the lifting platform 3 is a scissors 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 sleeved layer by layer.

[0033] In one embodiment of the present application, the lifting platform is a scissor lifting platform, and a plurality of metal sleeves 8 are externally sleeved to realize cladding.

[0034] In a further optimization scheme, the mobile platform 5 is a double-shaft mobile platform.

[0035] In one embodiment of the present application, the mobile platform 5 is a double-shaft mobile platform, that is, an X-Y shaft mobile platform, which is driven by the lead screw to move horizontally and vertically, thereby driving the three-dimensional verification phantom 11 to move horizontally and vertically, and cooperating with the lifting platform 3 to realize the movement of the three-dimensional verification phantom 11 in the X, Y and Z three-axis directions.

[0036] In a further optimization scheme, the sleeve 7 is an equivalent water material sleeve.

[0037] In a further optimization scheme, the bearing platform 4 is fixedly connected with a counterweight 10 at one end away from the treatment aperture 9.

[0038] The counterweight 10 is located at the tail end of the overall structure and is used to ensure the balance of the overall structure.

[0039] In a further optimization scheme, through holes are formed in the four corners of the bottom end of the base 1, and support nuts 12 are threadedly connected in the through holes.

[0040] The support nuts 12 can rotate, thereby enabling the four corners of the base 1 to have different lifting heights, and the base 1 can be horizontally adjusted by rotating the support nuts 12.

[0041] In a further optimization scheme, positioning bolts are threadedly connected to the sleeve 7, and one end of each positioning bolt penetrates through the sleeve 7 and contacts the support rod 6.

[0042] By rotating the positioning bolts to contact the support rod 6, the positioning of the sleeve 7 is realized to ensure the stability when the sleeve 7 is aligned with the circuit of the three-dimensional verification phantom 11.

[0043] The present application provides an automatic positioning device for helical tomotherapy plan verification, which is used in the following manner: first, the three-dimensional verification phantom 11 is fixed on the support rod 6, and the sleeve 7 is moved to keep the position of the ionization chamber consistent with the circuit board part of the three-dimensional verification phantom 11 in the transverse plane; the red laser light of the TOMO device is moved to a certain position with spatial coordinates X', Y', and Z'; the positioning is performed based on the red laser light according to the scale line on the base 1 of the device, and this position is taken as the initial isocenter position of the three-dimensional verification phantom 11 with spatial coordinates 0, 0, and 0; at this time, the positioning mark line of the three-dimensional verification phantom 11 is aligned with the green laser light with spatial coordinates 0, 0, and 0, and the center coordinates of the mobile platform 5 are X0, Y0, and Z0.

[0044] After the positioning is completed, the verification plan of a certain patient is started, first, the verification plan data, especially the red laser lamp coordinate data, is transmitted into the control computer, the control computer converts the red laser lamp coordinate data X1, Y1, Z1, i.e. 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 moving platform 5, and the height data Z1' of the lifting platform 3, then the control computer controls the moving platform 5 and the lifting platform 3 to reach the predetermined target position X1', Y1', Z1', at this time, the mark line of the three-dimensional verification phantom 11 is positioned, which corresponds to the position X1, Y1, Z1 of the red laser lamp, and thus the three-dimensional verification phantom 11 positioning work of the verification plan of the patient is automatically completed. With the implementation of the verification plan, the treatment bed continuously advances, when the high-energy rays irradiate the circuit part, i.e. the ionization chamber part, the ionization chamber monitors the threshold value of the irradiation of the rays, and the control computer immediately issues a warning to remind the physicist. If the rays do not stop out of the beam, the cumulative dose monitored by the ionization chamber reaches the second threshold value, then the moving platform 5 is automatically driven to move in the retreat direction, exits the TOMO treatment aperture, and automatically avoids further irradiation of the rays to prevent possible damage to the circuit.

[0045] When the device is used as a carrier of the three-dimensional dose three-dimensional verification phantom 11 for dose verification of TOMO radiotherapy, the three-dimensional dose three-dimensional verification phantom has a larger measurement range in the left and right directions, and has an advantage for radiotherapy plan verification of eccentric tumors.

[0046] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the claims of the present application.

Claims

1. An auto-positioning device for helical tomotherapy plan verification, characterized in that, The utility model relates to a three-dimensional verification model for helical tomotherapy device, which comprises: a base (1) on a treatment bed (2) of a helical tomotherapy device; a lifting platform (3) fixedly connected to the top end of the base (1), wherein the top end of the lifting platform (3) is fixedly connected to a bearing platform (4), and the bearing platform (4) is provided with a moving platform (5), wherein one end of two support rods (6) is fixedly connected to the side of the moving platform (5) close to the treatment bed (2); a three-dimensional verification model (11) fixedly connected to the other end of the two support rods (6), wherein the three-dimensional verification model (11) extends into a treatment aperture (9) through the moving platform (5); a warning component comprising two warning elements, wherein the two warning elements are respectively arranged on the two support rods (6), and the warning elements are aligned with the circuit of the three-dimensional verification model (11) to monitor the radiation dose received by the circuit of the three-dimensional verification model (11).

2. The automatic positioning device for helical tomotherapy plan verification according to claim 1, wherein: The warning element comprises a sleeve (7), wherein the sleeve (7) is sleeved on the support rod (6) and is in sliding connection with the support rod (6), and an ionization chamber is arranged in the sleeve (7), wherein the ionization chamber is used to monitor the irradiation threshold of the rays.

3. The automatic positioning device for helical tomotherapy plan verification of claim 1, wherein: The lifting platform (3) is a scissor lifting platform, and a plurality of metal sleeves (8) are arranged on the outer side of the lifting platform (3), wherein the plurality of metal sleeves (8) are sleeved layer by layer.

4. The automatic positioning device for helical tomotherapy plan verification of claim 1, wherein: The moving platform (5) is a double-shaft moving platform.

5. The automatic positioning device for helical tomotherapy plan verification of claim 2, wherein: The sleeve (7) is an equivalent water material sleeve.

6. The automatic positioning device for helical tomotherapy plan verification of claim 1, wherein: The bearing platform (4) is fixedly connected to a counterweight (10) at the end away from the treatment aperture (9).

7. The automatic positioning device for helical tomotherapy plan verification of claim 1, wherein: Threaded nuts (12) are screwed into the through holes in the four corners at the bottom end of the base (1).

8. The automatic positioning device for helical tomotherapy plan verification of claim 2, wherein: Positioning bolts are screwed onto the sleeve (7), wherein one end of the positioning bolts penetrates through the sleeve (7) and is in contact with the support rod (6).

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