CN110234396B

CN110234396B - Radiotherapy equipment

Info

Publication number: CN110234396B
Application number: CN201780085168.9A
Authority: CN
Inventors: 刘海峰; 肖世群; 杨勇强
Original assignee: Wuhan Cybermed System Co ltd; Our United Corp
Current assignee: Wuhan Cybermed System Co ltd; Our United Corp
Priority date: 2017-02-13
Filing date: 2017-02-13
Publication date: 2022-02-08
Anticipated expiration: 2037-02-13
Also published as: WO2018145317A1; CN110234396A; CN114306957A

Abstract

The invention discloses radiotherapy equipment, relates to the technical field of medical instruments, and solves the problem of isocenter deviation caused by treatment head droop of radiotherapy equipment in the related art. A radiotherapy apparatus comprising: the device comprises a rack, a cantilever and a treatment head, wherein the cantilever comprises a connecting end and a free end, the connecting end of the cantilever is connected with the rack, and the free end of the cantilever is connected with the treatment head; the support device is arranged between the free end and the connecting end of the cantilever and is connected with the cantilever and/or the treatment head.

Description

Radiotherapy equipment

Technical Field

The invention relates to the technical field of medical instruments, in particular to radiotherapy equipment.

Background

Radiation therapy is a common treatment for tumors. As shown in fig. 1, a radiotherapy apparatus in the related art includes a frame 1, a cantilever 2 (C-arm), a treatment head 3 and a treatment couch 4, wherein the treatment head 3 can emit a radiation beam, the frame 1 is fixedly disposed on the ground, the cantilever 2 is connected to the frame 1, and the cantilever 2 can drive the treatment head 3 to rotate circumferentially along a rotation axis 11. The intersection of the center of the radiation beam and the rotation axis 11 is the "isocenter 12", and the patient is positioned on the treatment couch 4 to correspond the position of the isocenter 12 to the tumor, thereby performing radiation treatment on the tumor.

As shown in figure 2, the radiation therapy device may have varying degrees of sagging of the treatment head during use due to the weight of the treatment head 3 and the over-dimensioning of the cantilever, resulting in an unintentional displacement of the isocenter 12, shown in figure 2 by a distance d. Especially in the case of circumferential rotation of the treatment head 3, when the treatment head 3 rotates to the bottom, the isocenter is shifted to the other direction, that is, the accuracy is reduced by several times. The isocenter is deviated, the radiation beam emitted by the treatment head does not irradiate the tumor and cannot achieve the treatment effect, and the radiation beam emitted by the treatment head irradiates normal tissues or organs of a human body to generate additional radiation and possibly cause secondary tumor.

Disclosure of Invention

The invention provides a radiotherapy device, which supports a cantilever through a support frame, and the support frame can rotate together with the cantilever under the drive of the cantilever, so that the problem of isocenter deviation caused by the sag of a treatment head is solved.

In order to solve the technical problems, the invention adopts the following technical scheme:

the present invention provides a radiotherapy apparatus comprising: the device comprises a rack, a cantilever and a treatment head, wherein the cantilever comprises a connecting end and a free end, the connecting end of the cantilever is connected with the rack, and the free end of the cantilever is connected with the treatment head; the support device is arranged between the free end and the connecting end of the cantilever and is connected with the cantilever and/or the treatment head.

Optionally, the cantilever can drive the treatment head to rotate along the rotation axis;

the support device includes: the support frame is fixed relative to the rack, the rotator is connected with the cantilever and/or the treatment head, and the rotator can rotate along the rotation axis relative to the support frame.

The present invention provides a radiotherapy apparatus comprising: frame, cantilever and treatment head, wherein, the cantilever includes link and free end, and the link and the frame of cantilever are connected, and the free end and the treatment head of cantilever are connected. Radiotherapy equipment still includes strutting arrangement in this application, and strutting arrangement sets up between the free end and the link of cantilever to be connected with cantilever and/or treatment head, strutting arrangement can undertake the weight of treatment head, thereby avoid radiotherapy equipment to appear drooping in the use and cause the problem of isocenter skew, guaranteed the equipment precision, ensure treatment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a radiotherapy apparatus provided in the related art;

FIG. 2 is a schematic view showing a treatment head of a radiotherapy apparatus provided in the related art drooping;

FIG. 3 is a schematic view of a radiation therapy apparatus provided by the present invention;

FIG. 4 is a schematic view of another radiation therapy apparatus provided by the present invention;

FIG. 5 is a schematic view of another radiation therapy apparatus provided by the present invention;

FIG. 6 is a schematic view of a radiation therapy apparatus according to the present invention;

FIG. 7 is a schematic view of another radiation therapy apparatus provided by the present invention;

FIG. 8 is a schematic view of another radiation therapy apparatus provided in accordance with the present invention;

fig. 9 is a schematic view of another radiation therapy apparatus provided by the present invention.

Reference numerals:

1-a frame; 2-a cantilever; 3-treatment head; 4-treatment bed; 5-a support device; 6-a connecting device; 7-a drive shaft; 8-protective plate; 9-a roller; 11-axis of rotation; 12-isocenter; 13-a shield; 21-free end; 22-a connection end; 23 a-a laser emitter; 23 b-a laser receiver; 24 a-a first bulb; 24 b-a first detector; 25 a-a second bulb; 25 b-a second detector; 31-receiving plate; 41-bed board; 42-bed frame; 51-an opening; 52-a rotating body; 53-support frame.

Detailed Description

The technical solution of the present invention will be further described in more detail with reference to the following embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

The present application provides a radiotherapy apparatus, illustratively shown in fig. 3, comprising: frame 1, cantilever 2 and treatment head 3, wherein, cantilever 2 includes link 22 and free end 21, and the link 22 and the frame 1 of cantilever 2 are connected, and the free end 21 and the treatment head 3 of cantilever 2 are connected. As shown in fig. 3, the radiotherapy apparatus further comprises a support means 5, the support means 5 being arranged between the free end 21 and the connection end 22 of the cantilever 2 and being connected to the cantilever 2 and/or the treatment head 3.

In fig. 3, the cantilever 2 is illustrated as extending directly out of the frame 1. For example, as shown in fig. 4, the cantilever 2 may also be an "L" shaped arm, and in fig. 4, the cantilever 2 and the frame 1 may be fixedly connected through a connecting device 6. Of course, the cantilever 2 may be a "C" shaped arm, and the specific structure and shape of the cantilever are not limited in this application, and only the example shown in fig. 3 will be described in detail.

In the present application, the supporting device 5 is connected to the cantilever 2 and/or the therapy head 3, and may be that the supporting device 5 is connected to the cantilever 2, or the supporting device 5 is connected to the therapy head 3, or the supporting device 5 is connected to both the cantilever 2 and the therapy head 3.

Illustratively, if the supporting device 5 is connected to the cantilever 2, the supporting device 5 can further provide a supporting force for the cantilever 2 because the supporting device 5 is located between the free end 21 and the connecting end 22 of the cantilever 2, thereby preventing the therapy head 3 from sagging, avoiding the problem of causing isocenter offset, ensuring the precision of the device and ensuring the therapeutic effect. Specifically, as shown in fig. 3, the force arm from the therapy head 3 to the supporting device 5 is a first force arm L1, the force arm from the therapy head 3 to the connecting end 22 is a second force arm L2, and because the supporting device 5 is arranged between the free end 21 and the connecting end 22 of the cantilever 2, the first force arm L1 is smaller than the second force arm L2, and under the supporting action of the supporting device 5, the force of the therapy head 3 on the cantilever 2 is smaller, so that the therapy head is prevented from sagging, the problem of isocenter offset is avoided, the equipment precision is ensured, and the therapy effect is ensured.

For example, if the supporting device 5 is connected to the therapy head 3, the supporting device can directly support the therapy head to prevent the therapy head 3 from sagging, and the moment arm from the therapy head 3 to the supporting device 5 is the first moment arm L1, which can be close to zero.

The present application provides a radiotherapy apparatus comprising: frame, cantilever and treatment head, wherein, the cantilever includes link and free end, and the link and the frame of cantilever are connected, and the free end and the treatment head of cantilever are connected. Radiotherapy equipment still includes strutting arrangement in this application, and strutting arrangement sets up between the free end and the link of cantilever to be connected with cantilever and/or treatment head, strutting arrangement can undertake the weight of treatment head, thereby avoid radiotherapy equipment to appear drooping in the use and cause the problem of isocenter skew, guaranteed the equipment precision, ensure treatment.

In the present application, the treatment tip may be an accelerator, a treatment tip formed of a radioisotope (e.g., cobalt-60), a proton treatment tip, or the like, and the treatment tip is not particularly limited in the present application. The radiation therapy equipment provided by the application can comprise one or more treatment heads (for example, two or three treatment heads, etc.), and the figures of the application all use the radiation therapy equipment comprising one treatment head as an example for detailed description. The radiotherapy device in the present application may further include other components, and the like, and the other components are not specifically described and limited in the present application, and only components related to the inventive point of the present application are described.

In the radiotherapy device provided by the present application, as shown in fig. 5, the radiotherapy device further comprises a treatment couch 4, the support device 5 comprises an opening 51, and the treatment couch 4 can move through the opening 51. In fig. 5, taking the treatment couch 4 including the couch top 41 and the couch base 42 as an example, the couch base 42 supports the couch top 41 and can be driven to move the couch top 41, and the treatment couch 4 can be moved through the opening 51 by moving the couch top 41 in the 101 direction so as to pass through the opening 51. As shown in fig. 5, so that the human head can pass through the opening 51 to position and treat the body tumor when the body tumor is treated by the radiotherapy device.

In the radiotherapy equipment provided by the application, as shown in fig. 6, the cantilever 2 can drive the treatment head 3 to rotate along the rotation axis 11; the support device 5 includes: a support frame 53 and a rotator 52, wherein the support frame 53 is fixedly arranged relative to the frame 1, the rotator 52 is connected with the cantilever 2 and/or the treatment head 3, and the rotator 52 can rotate along the rotation axis 11 relative to the support frame 53.

It should be noted that the cantilever can drive the therapy head to rotate along the rotation axis, and as shown in fig. 1, the cantilever 2 drives the therapy head 3 to rotate around the rotation axis 11, specifically, the therapy head 3 rotates around the radial direction of the human body, so that the radiation beam passes through different areas of the human body to irradiate on the tumor, and the local skin and organs are prevented from being damaged by the concentrated irradiation.

The rotating body 52 is connected with the cantilever 2 and/or the treatment head 3, the rotating body 52 can be connected with the cantilever 2, or the rotating body 52 is connected with the treatment head 3, or the rotating body 52 can be connected with the cantilever 2 and the treatment head 3.

In the present application, the support device 5 includes: support frame 53 and rotator 52, rotator 52 can rotate along rotation axis 11 relative to support frame 53, and rotator 52 is connected with cantilever 2 and/or treatment head 3 to when cantilever 2 drove treatment head 3 and rotate along rotation axis 11, rotator 52 can rotate with cantilever 2 synchronous, thereby support the treatment head at rotatory in-process, prevent that treatment head 3 from drooping and avoid causing the problem of isocenter skew, guaranteed equipment precision, ensure treatment.

In the technical scheme of the application, in the case that the supporting device comprises a supporting frame and a rotating body, the supporting frame can comprise a large opening, and the rotating body can comprise a small opening, so that the treatment bed can move through the opening of the rotating body. Of course, the structure of the supporting device is not particularly limited in this application, and the description is given only by way of example.

The radiation therapy device provided by the application can be realized in a plurality of different ways by connecting the support frame and the rotating body and rotating the rotating body relative to the support frame along the rotating axis. Illustratively, the support frame and the rotating body are connected through a rolling bearing to realize rotation. The present application is not limited to this, and the present application is only exemplified by the above examples.

In the technical solution of the present application, as shown in fig. 7, the supporting device 5 includes: a support frame 53 and a rotating body 52, the radiotherapy apparatus further comprises a drive shaft 7, the drive shaft 7 drives the cantilever 2 to rotate along the rotation axis 11, and the rotating body 52 is connected with the drive shaft 7. On one hand, the rotating body is connected with the driving shaft, the driving shaft can directly drive the rotating body to rotate, on the other hand, the rotating body is connected with the driving shaft, the coaxiality of the rotating axis of the rotating body and the rotating axis of the cantilever can be realized more easily, the installation mode is simplified, and the coaxiality confirmation by other structures or equipment is avoided.

Specifically, the invention provides a rotating body structure, wherein the rotating body comprises a first flange, a second flange and a connecting piece for connecting the first flange and the second flange; wherein, the first flange is connected with the cantilever and/or the treatment head, and the second flange is connected with the driving shaft.

The first flange is connected with the cantilever or the treatment head, and the first flange can be provided with an opening so that the treatment bed can reciprocate through the opening. Further, in the present application, the first flange and the second flange may have different sizes, for example, the diameter of the first flange is larger than that of the second flange, and the structure of the rotating body is not specifically limited in the present application, and is described only by way of example.

The technical scheme that this application provided, it is further, strutting arrangement and frame fixed connection. Because the supporting device is a fixing device, the rack is a fixing device, and the supporting device is fixedly connected with the rack, the fixity of the supporting device and the rack is further improved.

Specifically, the radiotherapy equipment further comprises a base; the frame is connected with the base; and the supporting device is connected with the base so as to realize the fixed connection of the supporting device and the frame. Of course, the supporting device can be fixed on the ground, and the frame can also be fixed on the ground. The present application is not limited to the fixing connection manner between the supporting device and the frame, and only the above is taken as an example for description.

The application provides a radiotherapy equipment, radiotherapy equipment still includes at least one set of image device, and image device includes bulb and the detector of relative setting, and the beam that the bulb sent can be received by the detector through the patient. As shown in fig. 6, the radiotherapy apparatus is exemplified to comprise two sets of imaging devices, the first imaging device comprises a first bulb 24a and a first detector 25a, and the second device comprises a second bulb 24b and a second detector 25b, wherein the beams of the two sets of imaging devices intersect.

In fig. 6, the imaging device is fixed on the supporting frame, for example, the imaging device may be fixed on the frame or on the ceiling and the floor. Of course, the imaging device may also be rotated, for example, by fixing the imaging device to the rotating body, so that the imaging device is rotated by the rotating body.

In the application, the installation positions of the treatment head and the imaging device can be set as required to prevent the treatment beam emitted by the treatment head from interfering with the beam of the imaging device.

The radiotherapy equipment provided by the application further comprises a receiving flat plate 31 which is arranged opposite to the treatment head 3, as shown in fig. 6. The receiving plate can receive the beam of the treatment head, so that the beam of the treatment head can be subjected to dose verification, precision verification and the like. Of course, if the beam of the treatment head is received by the receiving plate through the human body, the receiving plate may also form an image of the tumor region based on the received beam, so as to perform positioning or tracking of the patient during the treatment process. The application does not limit the specific function of the receiving plate.

The application provides a radiotherapy equipment, the receiving flat plate is rotatable to be located the opposite side of treatment head all the time in the process of treatment head rotation, receive the beam that treatment head sent. Specifically, the receiving plate may be fixed to the rotating body so as to be rotated by the rotation of the rotating body. The fixing and rotating modes of the receiving plate are not particularly limited in the present application, and the above description is only given as an example.

The present application provides a radiotherapy apparatus, as shown in fig. 8, the radiotherapy apparatus further includes a shielding body 13 disposed opposite to the therapy head 3, and the radiation beam emitted by the therapy head 3 passes through the human body and is absorbed by the shielding body 13, so that the risk of radiation leakage can be avoided. It should be noted that, in order to prevent the radiation from leaking, the treatment room is generally modified to make the wall of the treatment room thicker, and in the present application, the shielding body is arranged opposite to the treatment head to absorb the redundant radiation, so that the requirement of the radiotherapy equipment on the shielding protection of the treatment room is greatly reduced, and the construction or modification cost of the treatment room is greatly saved.

In a further preferred embodiment, the shield is rotatable about the axis of rotation, so that, in the case of a rotation of the treatment head, the shield is always located opposite the treatment head in order to receive the radiation beam emitted by the treatment head. Furthermore, the shielding body is fixedly connected to the rotating body and is driven by the rotating body to rotate. Of course, the shield may be rotated by an independent device or apparatus, and the rotation manner is not particularly limited in the present application, and is described by way of example only.

In a radiotherapy apparatus provided by the present application, as shown in fig. 8, in a case where the radiotherapy apparatus further includes a receiving plate 31 and a shield 13, the shield 13 is located behind the receiving plate 31. That is, the radiation beam emitted from the treatment head 3 passes through the human body, is received by the receiving plate 31, and the beam passing through the receiving plate 31 is received by the shield 13.

In the present application, the shielding body may be formed of a material having a shielding effect, and may be, for example, lead or tungsten or a tungsten alloy.

As shown in fig. 6, the radiotherapy apparatus provided by the present application further includes a laser device, the laser device includes a laser emitter 23a and a laser receiver 23b, fig. 6 illustrates an example in which the laser emitter 23a and the laser receiver 23b are oppositely disposed on the support frame, and the present application does not specifically limit the specific structure and arrangement of the laser device, and only illustrates the example by way of illustration.

According to the technical scheme, as shown in fig. 9, the radiotherapy equipment further comprises a treatment couch 4 and a protection plate 8, the treatment couch 4 and the treatment head 3 are respectively positioned on two sides of the protection plate 8, and an opening is formed in the protection plate 8, so that the treatment couch 4 can enter the other side of the protection plate 8 along the opening of the protection plate 8.

For example, and as illustrated in fig. 9, the couch 4 may be moved in a direction 101 so as to pass through the protection plate 8 and enter the side of the protection plate 8 having the therapy head 3, so as to deliver the patient for therapy.

On the one hand, the protection plate can isolate the radiotherapy equipment, so that the patient is prevented from panic, and the treatment effect of the patient is improved. On the other hand, the protection plate can also be made of shielding material (for example, lead, tungsten or alloy thereof) so as to separate the treatment space of the treatment room, namely, the side of the protection plate with the treatment head is the treatment space, and when the patient is treated, the patient is sent to the treatment space through the treatment couch for treatment. Because the isolation effect of guard plate can reduce the guard plate and have the radiation of treatment bed one side to when not carrying out the treatment or having medical personnel to enter, avoid leaking and penetrate or extra radiation.

It should be noted that, in the case that the radiotherapy apparatus further comprises an imaging device, a receiving plate or a laser device, they may be located on the side of the protection plate where the treatment head is located.

Further, as shown in fig. 9, the radiotherapy apparatus further comprises a drum 9, the drum 9 is positioned at a side of the shielding plate 8 where the treatment head 3 is positioned, one end of the drum 9 communicates with an opening of the shielding plate 8, and the treatment couch 4 is reciprocally movable in an axial direction of the drum 9 inside the drum 9. The roller can further isolate the patient from the radiotherapy equipment, and the treatment space formed by the roller can relieve the nervous mood of the patient.

The present application is not particularly limited with respect to the specific structure and fixation of the drum. Illustratively, the axis of the drum is coaxial with the axis of rotation. Illustratively, the other end of the drum is connected to a frame or support. Fig. 9 illustrates an example in which the other end of the drum is connected to the frame. Of course, the roller may also be connected with the supporting device, specifically, the rotating body, or the supporting frame.

Further, the present application provides a radiotherapy apparatus wherein the axis of the drum is coaxial with the axis of rotation about which the drum is rotatable. That is, when the cantilever drives the therapeutic head to rotate, the roller can also rotate synchronously or asynchronously with the therapeutic head. The roller is connected with the rotating body, and the roller can be driven to rotate by the rotating body. Of course, the drum is connected to the frame, but it is also possible that the drum is connected to a drive shaft, so that the drum is driven in rotation by the drive shaft. Of course, the drum may be rotated by an independent rotating mechanism, and the specific rotating manner of the drum is not limited in the present application, and the above description is only given as an example.

In addition, it should be noted that the treatment head can be either extended into the roller or positioned outside the roller, the roller is generally made of non-shielding materials such as plastics, and even if the treatment head is positioned outside the roller, the treatment effect on the patient is not affected due to the penetrability of rays.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A radiotherapy apparatus comprising: the device comprises a rack, a cantilever and a treatment head, wherein the cantilever comprises a connecting end and a free end, the connecting end of the cantilever is connected with the rack, and the free end of the cantilever is connected with the treatment head; the device is characterized by further comprising a supporting device, wherein the supporting device is arranged between the free end and the connecting end of the cantilever and is connected with the cantilever;

the cantilever can drive the treatment head to rotate along the rotation axis;

the support device includes: the support frame is fixedly arranged relative to the rack, the rotating body is connected with the cantilever, and the rotating body can rotate relative to the support frame along the rotation axis;

the radiotherapy apparatus further comprises a drive shaft that drives the cantilever to rotate along the rotation axis; the rotating body is connected with the driving shaft.

2. Radiotherapeutic apparatus according to claim 1 further comprising a couch, the support means comprising an opening through which the couch is movable.

3. Radiotherapeutic apparatus according to claim 1, wherein the rotating body comprises a first flange, a second flange and a connecting member connecting the first flange and the second flange;

wherein the first flange is connected with the cantilever, and the second flange is connected with the drive shaft.

4. The radiotherapy apparatus of claim 1, further comprising a couch and a shield, the couch and the treatment head being located on either side of the shield, the shield having an opening therein such that the couch can pass along the opening of the shield to access the other side of the shield.

5. The radiotherapy apparatus of claim 4, further comprising a drum positioned at a side of the shielding plate where the treatment head is positioned, one end of the drum communicating with the opening of the shielding plate, and a couch being reciprocally movable inside the drum in an axial direction of the drum.

6. Radiotherapeutic apparatus according to claim 5 in which the axis of the drum is coaxial with the axis of rotation about which the drum is rotatable.

7. Radiotherapeutic apparatus according to claim 6 in which the other end of the drum is connected to the rotating body.

8. Radiotherapeutic apparatus according to claim 1 further comprising at least one imaging device comprising an oppositely disposed bulb and detector, the beam emitted by the bulb passing through the patient being receivable by the detector.

9. Radiotherapy installation according to claim 8, characterized in that it comprises two sets of imaging devices whose beams intersect.

10. Radiotherapeutic apparatus according to claim 8 in which the imaging means is attached to the support means.

11. Radiotherapeutic apparatus according to claim 1, further comprising a receiving plate disposed opposite the treatment head.

12. Radiotherapeutic apparatus according to claim 11 in which the receiving plate is rotatable about the axis of rotation.

13. Radiotherapeutic apparatus according to claim 12 in which the receiving plate is fixedly attached to the rotator.

14. The radiotherapy apparatus of claim 1, further comprising a shield disposed opposite the treatment head, wherein the radiation beam emitted by the treatment head passes through the body and is absorbed by the shield.

15. Radiotherapeutic apparatus according to claim 14 in which the shield is rotatable about the axis of rotation.

16. Radiotherapeutic apparatus according to claim 15 in which the shield is fixedly attached to the rotating body.

17. Radiotherapeutic apparatus according to claim 1 further comprising a laser device comprising a laser transmitter and a laser receiver.

18. The radiotherapy apparatus of claim 1, wherein the support frame and the rotating body are connected to rotate through a rolling bearing; alternatively, the first and second electrodes may be,

the support frame and the rotating body are meshed through a gear and a gear ring to realize rotation.