CN107569783B

CN107569783B - Radiotherapy apparatus

Info

Publication number: CN107569783B
Application number: CN201710729076.1A
Authority: CN
Inventors: 靳峰
Original assignee: Neusoft Medical Systems Co Ltd
Current assignee: Neusoft Medical Systems Co Ltd
Priority date: 2017-08-23
Filing date: 2017-08-23
Publication date: 2020-10-13
Anticipated expiration: 2037-08-23
Also published as: CN107569783A

Abstract

The present invention provides a radiotherapy apparatus comprising: a frame structure, a scanning device, a radiotherapy device, a detection device and a treatment couch. The rack structure comprises a first rack and a second rack which are arranged side by side, wherein a first installation part is arranged on the first rack, and a second installation part and a first containing cavity are arranged on the second rack. The scanning device is embedded in the first installation part, the radiotherapy device is embedded in the second installation part, and the detection device is accommodated in the first accommodating cavity. The treatment bed comprises a bed plate and a driving mechanism for driving the bed plate to move. The scanning device, the detection device and the radiotherapy device are integrated on the same frame structure, so that the transfer time of a patient can be shortened, and the change time of a focus part can be further shortened. The radiotherapy device can timely adjust the treatment scheme according to the change condition of the focus part of the patient, which is obtained by the detection device in real time in the radiotherapy process, so that the precision and the speed of radiotherapy are effectively improved.

Description

Radiotherapy apparatus

Technical Field

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

Background

Radiation Therapy (RT) is a treatment that utilizes a high-energy X-ray dose to destroy diseased tissue. With the increasing functional integration of a medical electronic linear accelerator (electronic linear accelerator), the medical electronic linear accelerator has become more and more widely used in clinical applications. The targeted generation of high doses in the radiation center of a radiotherapy apparatus often causes problems with the variation of the radiation target in the body during the irradiation process, and in addition, the center of the lesion area may vary depending on the progress of the irradiation during the treatment process. Such as: the tumor has grown or shrunk during the time between the planned and actual irradiation.

During the course of radiation therapy, auxiliary positioners, fixtures or markers affixed to the patient's skin are currently mainly used to ensure that the position of the radiation target in the radiation therapy apparatus is in the same position as in the previous radiation plan, and thus the radiation center of the radiation therapy apparatus and the radiation target are also virtually coincident. Since the auxiliary positioner and fixing device produced on the market are relatively expensive, when a patient lies on the treatment couch, the patient feels a lot of discomfort. In addition, because these fixtures involve the risk of radiation errors, and the actual position of the radiation center is usually not checked during the actual operation, many factors affecting the accuracy of the treatment process are likely to be caused.

Therefore, it is an urgent need in the art to reduce damage to healthy tissue of a patient while ensuring that a sufficiently high radiation dose is irradiated to the treatment area of the patient.

Disclosure of Invention

The present invention provides a radiotherapy apparatus which minimizes damage to healthy tissue of a patient while ensuring a sufficiently high radiation dose to be irradiated at a treatment region of the patient.

The present invention provides a radiotherapy apparatus comprising: the radiotherapy treatment system comprises a rack structure, a scanning device, a radiotherapy device, a detection device and a treatment couch;

the rack structure comprises a first rack and a second rack which are arranged side by side, wherein a first mounting part is arranged on the first rack, and a second mounting part and a first accommodating cavity are arranged on the second rack;

the scanning device is embedded in the first installation part, the radiotherapy device is embedded in the second installation part, and the detection device is accommodated in the first accommodating cavity;

the treatment bed comprises a bed plate for supporting a patient and a driving mechanism for driving the bed plate to move.

Furthermore, the first frame and the second frame are rotatably connected through a hinge structure.

Further, the rotation angle between the first and second frames is 135 ° to 180 °.

Further, the first frame and the second frame are integrally formed into an arc-shaped structure.

Further, the driving mechanism comprises a translation mechanism arranged below the bed plate, and the translation mechanism is used for driving the bed plate to translate along the horizontal direction.

Further, actuating mechanism is including locating the rotary mechanism of bed board below, rotary mechanism is used for the drive the bed board is rotatory around vertical direction.

Further, the driving mechanism comprises a lifting mechanism arranged below the bed plate, and the lifting mechanism is used for driving the bed plate to lift along the vertical direction.

Further, the scanning device is of a cylindrical structure, and the radiotherapy device is of a cylindrical structure.

Further, the center of the scanning device is at the same level as the center of the radiotherapy device.

Further, the radiotherapy device comprises a treatment head, and the treatment head is arranged at the upper part of the second rack.

Furthermore, the first accommodating cavity is formed in the lower portion of the second rack, and the detection device is telescopically accommodated in the first accommodating cavity through a telescopic arm.

Furthermore, the scanning device is a computer tomography scanning device, the radiotherapy device is a medical electron linear accelerator, and the detection device is an electronic image flat panel detector.

Furthermore, the device also comprises a conical beam scanning device which is arranged at two sides of the machine frame structure.

Furthermore, the side parts of the first frame and the second frame are respectively provided with a second accommodating cavity, and the cone beam scanning device is telescopically arranged in the second accommodating cavity through a telescopic arm.

Furthermore, the cone beam scanning device positioned on one side of the first machine frame is a flat panel detector, and the cone beam scanning device positioned on one side of the second machine frame is a bulb detector.

Further, the display device is arranged between the first rack and the second rack.

According to the radiation therapy equipment, the scanning device, the radiation therapy device and the detection device are integrated on the same frame structure, the treatment bed is moved into the scanning device, the treatment area is determined according to the focus position of a patient through the scanning device, then the treatment bed can be quickly transferred into the radiation therapy device, and the time for changing the focus position can be effectively reduced. And then the radiotherapy device carries out radiotherapy on the patient, in the radiotherapy process, a current corresponding treatment area is obtained by the detection device according to the current focus position of the patient in real time, and the two areas are compared in real time to realize the real-time tracking of the change condition of the focus position of the patient, so that the radiotherapy device can timely adjust the treatment scheme according to the change condition of the focus position of the patient, the precision and the speed of the radiotherapy are effectively improved, and the damage to the healthy tissues of the patient is reduced as much as possible while the sufficient radiation dose is irradiated on the treatment area.

Drawings

Fig. 1 is a perspective view schematically showing a radiation therapy apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a radiation therapy apparatus according to an embodiment of the present invention.

Fig. 3 is a top view of a radiation therapy apparatus shown in an embodiment of the present invention.

Fig. 4 is a schematic structural view of another radiation therapy apparatus according to the embodiment of the present invention.

Fig. 5 is a top view of another radiation therapy apparatus shown in an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or several of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

The present invention provides a radiotherapy apparatus which minimizes damage to healthy tissue of a patient while ensuring a sufficiently high radiation dose to be irradiated at a treatment region of the patient. The radiotherapy apparatus of the present invention will be described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

Referring to fig. 1 and 2, the present invention provides a radiotherapy apparatus 100 comprising: a gantry structure 10, a scanning apparatus 20, a radiotherapy apparatus 30, a detection apparatus 40, and a treatment couch 50. The frame structure 10 includes a first frame 101 and a second frame 102 arranged side by side, the first frame 101 is provided with a first mounting portion (not shown), and the second frame 102 is provided with a second mounting portion (not shown) and a first accommodating cavity (not shown). The scanner 20 is embedded in the first mounting portion of the first frame 101. The radiotherapy device 30 is embedded in the second installation part of the second rack 102, the radiotherapy device 30 comprises a treatment head 301, and the treatment head 301 is arranged on the upper part of the second rack 102. The detecting device 40 is accommodated in the first accommodating cavity of the second housing 102. The treatment couch 50 includes a couch plate 501 for supporting a patient and a driving mechanism for driving the couch plate 501 to move, the driving mechanism being capable of driving the couch plate 501 to move into the scanning device 20 or the radiotherapy device 30. In this embodiment, the gantry structure 10 further includes two support portions 103 respectively disposed at the bottom of the first gantry 101 and the second gantry 102, and serving to support the whole radiotherapy apparatus 100.

It should be noted that the position of the scanning device 20 may be located at a left portion of the overall structure of the radiotherapy apparatus 100, or may be located at a right portion of the overall structure of the radiotherapy apparatus 100. Likewise, the position of the radiotherapy device 30 may be located at either the right side portion of the overall structure of the radiotherapy apparatus 100 or the left side portion of the overall structure of the radiotherapy apparatus 100. In the example shown in fig. 1, the position of the scanning device 20 is located at the right portion of the overall structure of the radiotherapy apparatus 100, and the position of the radiotherapy device 30 is located at the left portion of the overall structure of the radiotherapy apparatus 100.

As can be seen from the above technical solutions, in the radiotherapy apparatus 100 of the present invention, the treatment couch 50 is moved into the scanner 20, the treatment region is determined according to the lesion site of the patient by the scanner 20, and then the treatment couch 50 is transferred into the radiotherapy device 30, and the radiotherapy is performed on the patient by the radiotherapy device 30. On one hand, the scanning device 20, the radiotherapy device 30 and the detection device 40 are integrally arranged on the same frame structure 10 to form a multi-directional and three-dimensional radiotherapy device, so that the time for transferring the patient from the scanning device 20 to the radiotherapy device 30 can be reduced, and the time for changing the lesion position can be reduced. On the other hand, in the course of radiotherapy, the detection device 40 obtains the current corresponding treatment region according to the current focus position of the patient in real time, monitors the specific position of the focus position in the body of the patient, and compares the two in real time to realize real-time tracking of the change condition of the focus position of the patient, so that the radiotherapy device 30 can adjust the treatment scheme in time according to the change condition of the focus position of the patient or interrupt the radiation when necessary, thereby effectively improving the precision and speed of radiotherapy, thereby improving the treatment effect, and reducing the damage to the healthy tissue of the patient as much as possible while ensuring that the sufficient radiation dose irradiates on the treatment region.

In an alternative embodiment of the present invention, the first receiving cavity is disposed at a lower portion of the second frame 102, and the detecting device 40 is telescopically received in the first receiving cavity through a telescopic arm. The first receiving chamber shown in fig. 1 is provided in a supporting portion 103 of the first frame 101, and the detecting device 40 is received in the supporting portion 103. When the radiotherapy device 100 does not work, the detection device 40 can be accommodated and hidden in the first accommodating cavity of the second gantry 102, so that the appearance is smooth and beautiful. When the radiotherapy apparatus 100 is operated, the detecting device 40 is extended out of the first accommodating cavity of the second frame 102 for operation.

In an alternative embodiment of the invention, the radiotherapy apparatus 100 further comprises a Cone beam scanning device (CBCT, Cone beam CT)200, which is disposed on both sides of the gantry structure 10, i.e. on both sides corresponding to the first gantry 101 and the second gantry 102, together forming the Cone beam scanning device 200. The volume of the cone beam scanning device 200 is relatively small compared to the scanning device 20, which can play a role of auxiliary scanning, and for some parts (such as arms) with small local volume of the patient body, the scanning device 20 is not needed to perform whole-body scanning, and the cone beam scanning device 200 is used to perform local scanning on the patient, so that the scanning time is saved and the operation is simplified. Of course, the cone beam scanning device 200 may also work simultaneously with the scanning device 20, and the dynamic information of the three-dimensional image of the lesion site of the patient may be effectively obtained by the cone beam scanning device 200, so as to perform effective comparison and composite reconstruction with the image obtained by the scanning device 20, thereby really realizing clear image diagnosis. In addition, the cone-beam scanning device 200 can also be used to detect the patient during the radiation therapy process, so as to effectively obtain the information of the patient's focal region, and meanwhile, according to the actual change condition of the patient's focal region, help the radiation therapy device 30 to perform targeted adjustment of the patient's treatment plan, thereby ensuring that the treatment region of the patient can be effectively treated by radiation therapy.

Further, the side portions of the first frame 101 and the second frame 102 are respectively provided with a second accommodating cavity, and the cone beam scanning device 200 is telescopically arranged in the second accommodating cavity through the telescopic arm 80, so as to satisfy the design effect of the whole device structure of the radiotherapy device 100. When the cone beam scanning device 200 does not need to work, the cone beam scanning device 200 can be accommodated and hidden in the second accommodating cavity, so that the effect of smooth and attractive appearance is achieved. When the cone beam scanning device 200 needs to be operated, the cone beam scanning device 200 is extended out of the second receiving cavity for operation. In the example shown in fig. 2, the cone beam scanning device 200 on the first gantry 101 side is a flat panel detector, and the cone beam scanning device 200 on the second gantry 102 side is a tube detector, and the suitable cone beam scanning device 200 can be selected for use according to actual needs.

In an optional embodiment of the present invention, the driving mechanism includes a translation mechanism, a rotation mechanism, and an upgrade mechanism disposed below the bed plate 501. Referring to fig. 1, the translation mechanism is used to drive the bed plate 501 to translate in the horizontal direction, including transverse translation and longitudinal translation. The rotating mechanism is used for driving the bed plate 501 to rotate around the vertical direction. The lifting mechanism is used for driving the bed plate 501 to lift along the vertical direction. The driving mechanism is used to realize the translation, rotation, and lifting of the bed plate 501 of the treatment couch 50, and the scanning device 20 is used to collect data images of the lesion part of the patient, obtain information of the lesion to determine the treatment area, and make a corresponding radiotherapy plan, so as to prepare the radiotherapy device 30 for the dose intensity of the treatment area of the patient.

Further, the scanning device 20 has a cylindrical structure, and the radiotherapy device 30 has a cylindrical structure. Moreover, the center O1 of the scanning device 20 and the center O2 of the radiotherapy device 30 are at the same horizontal height, which is more convenient for the bed plate 501 of the treatment couch 50 to move in place, and the height of the bed plate 501 can be adjusted only once, thereby reducing the positioning error during scanning.

When the radiotherapy apparatus 100 operates, the top plate 501 of the treatment couch 50 is raised to the same level as the center O1 of the scanner 20 by the elevating mechanism of the driving mechanism, and then the top plate 501 is translated into the scanner 20 by the translation mechanism of the driving mechanism, and the treatment region of the patient is determined by the scanner 20 according to the lesion site of the patient obtained by scanning. After the scanning is completed, the table 501 is moved out of the scanner 20 by the translation mechanism of the drive mechanism and translated into the radiotherapy apparatus 30, and the radiotherapy apparatus 30 performs radiotherapy on the patient. During the radiotherapy process, the current focus position of the patient is scanned and obtained in real time through the detection device 40, the current corresponding treatment area is determined, and the two are compared in real time to track the change condition of the focus position of the patient in real time, so that the radiotherapy device 30 can adjust the treatment scheme in time according to the change condition of the focus position of the patient, the precision and the speed of radiotherapy are effectively improved, and the damage to the healthy tissues of the patient is reduced as much as possible while the sufficient radiation dose is irradiated on the treatment area.

Referring to fig. 3, in an alternative embodiment of the present invention, the first frame 101 and the second frame 102 are rotatably connected by a hinge structure 60, so that a certain treatment angle can be formed between the scanning device 20 and the radiotherapy device 30 to meet the design requirement of the treatment couch. Further, the rotation angle between the first frame 101 and the second frame 102 is 135 ° to 180 °. In the example shown in fig. 3, the rotating mechanism of the driving mechanism includes a rotating chassis 70 disposed below the top plate 501 of the treatment couch 50, so as to drive the top plate 501 to rotate in the vertical direction. The first frame 101 and the second frame 102 are rotatably connected with each other through the hinge structure 60, and the range of the rotation angle is set between 135 degrees and 180 degrees, so that the situation that the scanning device 20 and the radiotherapy device 30 are mutually overlapped can be avoided, the situation that the bed plate 501 of the treatment couch 50 needs to be lengthened, the rigidity of the bed plate 501 is insufficient, immeasurable potential harm to a patient is possibly caused is avoided, and the design difficulty of the treatment couch 50 is reduced in design.

In the case of a certain included angle between the scanning device 20 and the radiotherapy device 30, the initial position of the table plate 501 of the treatment couch 50 may be located at the intersection of the central axes of the first gantry 101 and the second gantry 102 as shown in fig. 3, so that the distance from the table plate 501 to the scanning device 20 and the radiotherapy device 30 may be the same, thereby reducing the positioning error. When the radiotherapy apparatus 100 operates, the top plate 501 of the treatment couch 50 is first raised to the same horizontal height as the center O1 of the scanning device 20 by the lifting mechanism of the driving mechanism, the top plate 501 is rotated to the position facing the scanning device 20 by the rotating chassis 70 of the rotating mechanism, the top plate 501 is then translated into the scanning device 20 by the translation mechanism of the driving mechanism, and the treatment region of the patient is determined by the scanning device 20 according to the lesion site of the patient obtained by scanning. After the scanning is finished, the bed plate 501 is moved out of the scanning device 20 by the translation mechanism of the driving mechanism and returned to the initial position, the bed plate 501 is rotated to the position facing the radiotherapy device 30 by the rotation chassis 70 of the rotating mechanism, the bed plate 501 is translated into the radiotherapy device 30 by the translation mechanism of the driving mechanism, and the radiotherapy is performed on the patient by the radiotherapy device 30. During the radiotherapy process, the current focus position of the patient is scanned and obtained in real time through the detection device 40, the current corresponding treatment area is determined, and the two are compared in real time to track the change condition of the focus position of the patient in real time, so that the radiotherapy device 30 can adjust the treatment scheme in time according to the change condition of the focus position of the patient, the precision and the speed of radiotherapy are effectively improved, and the damage to the healthy tissues of the patient is reduced as much as possible while the sufficient radiation dose is irradiated on the treatment area.

Referring to fig. 4, in an alternative embodiment of the present invention, the radiotherapy apparatus 100 further comprises a display device 90 for displaying prompt information, which may be information of the coordinate position of the patient, the scanning stage such as ECG (electrocardiogram), or the radiotherapy stage. Further, the display device 90 is disposed between the first frame 101 and the second frame 102, so that the display device 90 is located at a position between the scanning device 20 and the radiotherapy device 30, which can visually display various motion functions of the treatment couch 50 and indicate the coordinate position of the current patient. In the present embodiment, the display device 90 may employ a central liquid crystal display.

Referring to fig. 5, in an alternative embodiment of the present invention, the first frame 101 and the second frame 102 are integrally formed into an arc structure, so that the scanning device 20 and the radiation therapy device 30 are combined into an arc structure, which is more convenient for moving the bed plate 501 of the treatment couch 50 in place and can achieve a more beautiful appearance. The initial position of the table 501 of the treatment couch 50 may be located at the center of the arc structure formed by the first gantry 101 and the second gantry 102 as shown in fig. 5, so that the distance from the table 501 to the scanning device 20 and the radiotherapy device 30 may be the same, thereby reducing the positioning error.

When the radiotherapy apparatus 100 operates, the top plate 501 of the treatment couch 50 is first raised to the same horizontal height as the center O1 of the scanning device 20 by the lifting mechanism of the driving mechanism, the top plate 501 is rotated to the position facing the scanning device 20 by the rotating chassis 70 of the rotating mechanism, the top plate 501 is then translated into the scanning device 20 by the translation mechanism of the driving mechanism, and the treatment region of the patient is determined by the scanning device 20 according to the lesion site of the patient obtained by scanning. After the scanning is finished, the bed plate 501 is moved out of the scanning device 20 by the translation mechanism of the driving mechanism and returned to the initial position, the bed plate 501 is rotated to the position facing the radiotherapy device 30 by the rotation chassis 70 of the rotating mechanism, the bed plate 501 is translated into the radiotherapy device 30 by the translation mechanism of the driving mechanism, and the radiotherapy is performed on the patient by the radiotherapy device 30. During the radiotherapy process, the current focus position of the patient is scanned and obtained in real time through the detection device 40, the current corresponding treatment area is determined, and the two are compared in real time to track the change condition of the focus position of the patient in real time, so that the radiotherapy device 30 can adjust the treatment scheme in time according to the change condition of the focus position of the patient, the precision and the speed of radiotherapy are effectively improved, and the damage to the healthy tissues of the patient is reduced as much as possible while the sufficient radiation dose is irradiated on the treatment area.

In an alternative embodiment of the present invention, the scanning device 20 is a Computed Tomography (CT) device. The radiotherapy Device 30 is a medical Electronic Linear Accelerator (medical Electronic Linear Accelerator), and the detecting Device 40 is an Electronic Imaging flat panel detector (EPID).

In the CT, a layer of a certain thickness of a certain part of a patient is scanned by an X-ray beam, the X-ray transmitted through the layer is received by a detector, converted into visible light, converted into an electrical signal by photoelectric conversion, converted into a digital signal by an analog/digital converter, and input into a computer to form a clear image of the focus part of the patient. Therefore, the CT can more effectively scan the focus part of the patient, accurately acquire the condition of the lesion tissue and effectively improve the radiation treatment precision. The EPID collects the high-energy X-ray beams generated by the treatment head 301 of the radiotherapy device 30 or the beam limiter device, converts the energy signals into digital signals, carries out corresponding signal logic processing, and forms a clear image of the focus part of the patient on an upper computer software interface. Therefore, the combination of the two can provide better treatment effect for the patient, provide comparison basis for the radiotherapy device to effectively revise the treatment plan, and avoid the influence on the health of the patient caused by the excessive dose on the healthy part of the patient caused by the deviation of the focus part or the treatment area of the patient.

Therefore, the radiotherapy equipment can integrate the devices such as CT, RT, EPID, CBCT and the like on the same frame structure to form the integrated multifunctional combined radiotherapy equipment. Utilize CT on the one hand, CBCT realizes the information of the quick accurate image of acquireing patient's focus part, carry out real-time effectual image acquisition, analysis and location to patient's focus part through EPID simultaneously, thereby the change situation of real-time tracking acquireing patient's focus position, make radiotherapy device can in time adjust the treatment scheme according to the change situation of patient's focus position, thereby effectual improvement radiotherapy's precision and speed, reduce the healthy tissue that harms the patient as far as possible when guaranteeing that sufficient radiation dose shines in treatment area, the utilization ratio of whole equipment has been improved, the design cost is reduced simultaneously.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A radiotherapy apparatus, characterized by comprising: the radiotherapy treatment system comprises a rack structure, a scanning device, a radiotherapy device, a detection device and a treatment couch;

the rack structure comprises a first rack and a second rack which are arranged side by side, the first rack and the second rack are integrally formed into an arc-shaped structure, a first installation part is arranged on the first rack, and a second installation part and a first accommodating cavity are arranged on the second rack;

the scanning device is embedded in the first installation part, the radiotherapy device is embedded in the second installation part, and the detection device is accommodated in the first accommodating cavity; the scanning device is of a cylindrical structure, the radiotherapy device is of a cylindrical structure, the direction of the center line of the treatment hole of the scanning device is vertical to the arrangement direction of the first rack and the second rack which are arranged side by side, and the direction of the center line of the treatment hole of the radiotherapy device is vertical to the arrangement direction of the first rack and the second rack which are arranged side by side;

2. Radiotherapeutic apparatus according to claim 1 wherein the first gantry and the second gantry are pivotally connected by a hinge structure.

3. Radiotherapeutic apparatus according to claim 2 in which the angle of rotation between the first gantry and the second gantry is 135 ° to 180 °.

4. Radiotherapeutic apparatus according to claim 1 wherein the drive mechanism comprises a translation mechanism provided below the couch plate for driving the couch plate to translate in a horizontal direction.

5. Radiotherapy apparatus according to claim 4 in which the drive mechanism comprises a rotation mechanism provided below the couch plate for driving the couch plate to rotate about a vertical direction.

6. Radiotherapy apparatus according to claim 4 or claim 5 in which the drive mechanism comprises a lifting mechanism provided below the couch plate for driving the couch plate to lift in a vertical direction.

7. Radiotherapeutic apparatus according to claim 1, wherein the centre of the scanning device is at the same level as the centre of the radiotherapeutic device.

8. Radiotherapeutic apparatus according to claim 1, characterised in that the radiotherapeutic device comprises a treatment head, which is arranged at an upper part of the second gantry.

9. Radiotherapeutic apparatus according to claim 1, wherein the first housing chamber is provided at a lower portion of the second gantry, and the probe device is telescopically received in the first housing chamber by a telescopic arm.

10. The radiotherapy apparatus of claim 1, wherein the scanning device is a computed tomography device, the radiotherapy device is a medical electron linear accelerator, and the detection device is an electronic image flat panel detector.

11. Radiotherapeutic apparatus according to claim 1, further comprising cone beam scanning means provided on both sides of the gantry structure.

12. Radiotherapeutic apparatus according to claim 11 in which the sides of the first gantry and the second gantry each define a second receiving cavity in which the cone-beam scanning device is telescopically disposed by a telescopic arm.

13. Radiotherapeutic apparatus according to claim 12 wherein the cone beam scanning device on the first gantry side is a flat panel detector and the cone beam scanning device on the second gantry side is a tube detector.

14. The radiation therapy device of claim 1, further comprising a display device disposed between said first gantry and said second gantry.