Cone beam CT image radiotherapy system

Abstract

The cone beam CT image radiotherapy system comprises a rotating rack, a treatment bed, a radiotherapy head and an image guiding assembly, a flat panel detector and a CT bulb tube of the image guiding assembly are installed at the execution end of a first mechanical arm and the execution end of a second mechanical arm respectively, and the first mechanical arm and the second mechanical arm are six-degree-of-freedom mechanical arms. The flat panel detector and the CT bulb tube are close to a patient from any direction in the middle channel of the rotary body. In other words, under the control of the control module, the flat panel detector and the CT bulb tube firstly move to the initial position of the planned imaging track T, then the CT bulb tube moves along the first movement path, the flat panel detector moves along the second movement path, CT image collection and imaging of a needed patient are completed, the distance between the flat panel detector, the CT bulb tube and the patient can be greatly shortened during imaging, and the imaging efficiency is improved. The imaging quality is guaranteed, the tube pressure and tube flow of the CT bulb tube are correspondingly reduced, the additional exposure dose of a patient is reduced, and the service life of the CT bulb tube is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of radiotherapy, in particular to a cone beam CT image radiotherapy system. Background Art

[0002] Radiotherapy is one of the common treatment methods for cancer. Cone beam CT image-guided radiotherapy is to reduce the setup errors of patients or the changes in the position and size of tumors during inter-fraction or intra-fraction treatment, ensure the accuracy of treatment, and reduce the risk of mis-irradiation. The cone beam CT installed on the rotating gantry is a common cone beam CT image-guided radiotherapy device, which usually consists of a high-voltage generator, a kilovolt-level X-ray CT tube, and a flat panel detector. The X-ray CT tube and the flat panel detector are fixed at a certain position on the rotating gantry or move to a fixed position during use. The cone beam CT system rotates the gantry to collect sufficient projections and obtains three-dimensional CT images through a reconstruction algorithm. The three-dimensional CT image is registered with the CT of the patient's treatment plan or the images collected in the previous treatment stage to obtain the setup deviation, and this deviation is used to correct the support device of the patient treatment couch.

[0003] The existing cone beam CT image-guided radiotherapy system includes a rotating ring, a source body, a flat panel detector, etc. There are multiple radiation sources in the source body, and the radiation beams emitted by the radiation sources are focused on the common focus on the axis of the rotating ring. One end of the source body and the flat panel detector are respectively connected to the rotating ring and are arranged radially opposite to each other along the rotating ring. There are high-activity treatment radiation sources and low-activity diagnostic radiation sources in the source body. The radiation beams of the radiation sources pass through the axis of the rotating ring and enter the flat panel detector arranged opposite to the source body. After the flat panel detector receives the radiation information, it makes a response and outputs the detection information. However, due to the relatively fixed positions of the CT tube and the flat panel detector, the following problems exist: (1) The volume of the collected images is fixed. If it is necessary to increase the scanning volume, only the half-scanning method can be used, but this increases the scanning angle; (2) The resolution of the collected images is fixed. In order to provide sufficient patient space, the flat panel detector is usually more than 50 cm away from the rotation center in cone beam CT. According to the X imaging principle, the flat panel detector should be as close as possible to the imaging target to improve the image resolution; (3) When the scanning range is small, in order to ensure the image resolution, a higher tube voltage and tube current are still required, which is not conducive to improving the utilization efficiency of X-rays; (4) Increasing the count of the image flat panel detector can only increase the tube voltage and tube current, but this increases the patient dose. Therefore, the imaging clarity of the CT images of the current cone beam CT image-guided radiotherapy system is poor, the utilization efficiency of X-rays is not high, and it will also bring additional radiation risks, which limits the use of cone beam CT in radiotherapy to a certain extent. Improving the imaging quality of cone beam CT, improving the ray use efficiency, and reducing the imaging dose are important research directions for cone beam CT image-guided radiotherapy. Summary of the Utility Model

[0004] In view of the above partial disadvantages of the prior art, the purpose of the present utility model is to provide a cone beam CT image radiotherapy system, which solves the problem of poor imaging quality of the cone beam CT in cone beam CT image-guided radiotherapy, and improves the ray usage efficiency and reduces the imaging dose.

[0005] The specific technical solution includes the following: A cone beam CT image radiotherapy system includes a rotating gantry, the rotating gantry includes a rotating body, and the rotating body is provided with a treatment space;

[0006] A treatment couch, the bottom of the treatment couch is provided with a support adjustment mechanism, and the support adjustment mechanism supports and adjusts the position of the treatment couch relative to the treatment space;

[0007] A radiotherapy head, the radiotherapy head is fixedly installed on the side wall of the rotating body that defines the treatment space, so that the rays of the radiotherapy head irradiate at a preset position in the treatment space;

[0008] A first image acquisition unit, the first image acquisition unit includes a ray emitting device and a first movable connection assembly, one end of the first movable connection assembly is installed on the side wall of the rotating body, and the other end is connected to the ray emitting device; and

[0009] A second image acquisition unit, the second image acquisition unit includes a detection device and a second movable connection assembly, one end of the second movable connection assembly is installed on the side wall of the rotating body, and the other end is connected to the detection device;

[0010] Wherein, the first movable connection assembly and the second movable connection assembly are respectively telescoped and rotated so that the ray emitting device and the detection device are respectively located on two opposite sides of the patient on the treatment couch and move along the contour of the part to be treated of the patient, and at the same time, the rays emitted by the ray emitting device are received by the detection device to detect an image of the part to be treated of the patient.

[0011] In an embodiment of the present utility model, the first movable connection assembly and the second movable connection assembly are respectively a first robotic arm and a second robotic arm with six degrees of freedom.

[0012] In an embodiment of the present utility model, the first robotic arm and the second robotic arm respectively include a mounting base, a first arm, a second arm and an actuator.

[0013] In an embodiment of the present utility model, the mounting base and the first end of the first arm are connected by a first rotating shaft, the second end of the first arm opposite to its first end and the first end of the second arm are connected by a second rotating shaft, and the second end of the second arm opposite to its first end and one end of the actuator are connected by a third rotating shaft.

[0014] In an embodiment of the present utility model, each actuator includes an actuator end extending outward and a mounting end opposite to its actuator end. A mounting plate is provided on the mounting end, and the mounting plate is inserted between the U-shaped openings at the second end of the second arm and is connected by a third rotating shaft.

[0015] In an embodiment of the present utility model, the mounting bases of the first robotic arm and the second robotic arm are symmetrically mounted radially opposite on the side wall of the rotating body, and the radiotherapy head is located at the middle position between the mounting bases of the first robotic arm and the second robotic arm.

[0016] In an embodiment of the present utility model, the actuator end of the first robotic arm is fixedly connected to the bottom wall flange of the ray emitting device, so that the emission port of the ray emitting device is located on the axis of the corresponding actuator.

[0017] In an embodiment of the present utility model, a boss is provided at the actuator end of the actuator of the second robotic arm, and a pair of connecting plates are mounted on the boss. The connecting plates are fixedly connected to the mounting surface of the detection device, so that the detection device is arranged perpendicular to the axis of the corresponding actuator.

[0018] In an embodiment of the present utility model, the support and adjustment mechanism of the treatment couch realizes the positioning of the treatment couch along the X, Y, and Z directions through a moving component, and makes the center of the part to be treated of the patient located on the rotation center axis of the rotating body.

[0019] In an embodiment of the present utility model, the ray emitting device is a CT tube, and the detection device is a flat panel detector.

[0020] The beneficial technical effects of the present utility model at least include:

[0021] A cone beam CT image radiotherapy system provided by the present utility model, the flat panel detector and the CT tube of the image guiding component are respectively installed at the actuator ends of the first robotic arm and the second robotic arm. The first robotic arm and the second robotic arm are six-degree-of-freedom robotic arms. The first robotic arm and the second robotic arm can perform 3 linear axial movements (horizontal axis, vertical axis, vertical axis) and 3 rotational axial movements (swing, pitch, roll) relative to the rotating body. At a preset distance L from the outer contour C of the patient, a planned imaging path L is determined, so that the flat panel detector and the CT tube move to the pre-planned imaging trajectory T, which can greatly shorten the distance between the flat panel detector, the CT tube and the patient during imaging, not only ensuring the imaging quality, but also correspondingly reducing the tube voltage and tube current of the CT tube, reducing the additional radiation dose received by the patient, and prolonging the service life of the CT tube. When the image guiding component scans and images, it is not necessary for the rotating body to rotate 360 degrees to complete. The rotating body only needs to rotate appropriately during the radiotherapy of the patient's lesion by the radiotherapy head, realizing the time-sharing and segmented performance of image-guided three-dimensional CT imaging and radiotherapy stages, and ensuring the treatment effect. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a cone-beam CT image radiotherapy system when it is in the first position in an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of a cone-beam CT image-guided radiotherapy system when it is in the second position in an embodiment of the present invention;

[0025] Figure 3 It is Figure 2 an enlarged view of part A of

[0026] Figure 4 It is Figure 2 an enlarged view of part B of

[0027] Element number description: Rotating body 1, treatment space 11, treatment couch 2, radiotherapy head 3, detection device 42, ray emission device 41, emission port 411, first robotic arm 51, second robotic arm 52, mounting base 511, first arm 512, second arm 513, actuator 514, mounting plate 5141, first rotating shaft 515, second rotating shaft 516, third rotating shaft 517, boss 521, connecting plate 522. Detailed implementation manners

[0028] The following uses specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for the purpose of describing specific implementation manners, rather than for limiting the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0029] Please refer to Figures 1 to 3It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this utility model. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of this utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which this utility model can be implemented.

[0030] When an embodiment gives a numerical range, it should be understood that unless otherwise specified in this utility model, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in this utility model, based on the understanding of those skilled in the art of this technology and the description of this utility model, any method, device, and material similar to or equivalent to the methods, devices, and materials described in the embodiments of this utility model can also be used to implement this utility model.

[0031] It should be noted that in the prior art, radiotherapy for tumors requires multiple setups. The patient needs to be moved to another position or imaging department for imaging confirmation. During patient setup, other imaging devices need to be used to pre-determine and mark the location of the patient's lesion. An imaging device at another position or department needs to be reserved to image the patient's lesion, and the lesion position needs to be marked and fixed. This fixation requires using special materials on the positioning bed to hold the patient on the positioning bed, and calculating based on the reference center on the bed to determine the distance of the lesion position relative to the reference center. The positioning bed with the patient fixed is transported to the treatment setup device of the radiotherapy equipment through a moving instrument, and then automatic setup is performed through the radiotherapy equipment based on the reference center of the positioning bed to implement the treatment. If there is a deviation in the setup, the dose actually received by the lesion will be different from the prescribed dose in the radiotherapy plan, which may lead to a second or even multiple treatments to achieve the required dose and treatment effect in the expected radiotherapy plan. The treatment process takes a long time, which will indirectly increase the radiation dose received by the non-treatment parts of the patient, bringing adverse effects. Keeping the same posture for a long time will affect the patient's mood and cause the patient to adjust the posture, thus affecting the position of the lesion on the positioning bed.

[0032] Please refer to Figure 1, the technical solution of the present utility model will be described in detail with reference to specific embodiments: A cone beam CT image radiotherapy system includes a rotating gantry, a treatment couch 2, a radiotherapy head 3, a first image acquisition unit, and a second image acquisition unit. The rotating gantry includes a rotating body 1, and the rotating body 1 is provided with a treatment space 11; a support adjustment mechanism is provided at the bottom of the treatment couch 2, and the support adjustment mechanism supports and adjusts the position of the treatment couch 2 relative to the treatment space 11; the radiotherapy head 3 is fixedly installed on the side wall of the rotating body 1 that defines the treatment space 11, so that the rays of the radiotherapy head 3 irradiate at a preset position in the treatment space 11; the first image acquisition unit includes a ray emitting device 41 and a first movable connection assembly, one end of the first movable connection assembly is installed on the side wall of the rotating body 1, and the other end is connected to the ray emitting device 41; the second image acquisition unit includes a detection device 42 and a second movable connection assembly, one end of the second movable connection assembly is installed on the side wall of the rotating body 1, and the other end is connected to the detection device 42. Among them, the first movable connection assembly and the second movable connection assembly are extended, retracted and rotated so that the ray emitting device 41 and the detection device 42 are respectively located on two opposite sides of the patient on the treatment couch 2 and move along the contour of the part to be treated of the patient, and at the same time, the rays emitted by the ray emitting device 41 are received by the detection device 42 to detect the image of the part to be treated of the patient.

[0033] In an embodiment of the present utility model, the first movable connection assembly and the second movable connection assembly are respectively a six-degree-of-freedom first robotic arm 51 and a second robotic arm 52. The first robotic arm 51 and the second robotic arm 52 respectively include a mounting base 511, a first arm 512, a second arm 513, and an actuator 514. The mounting base 511 and the first end of the first arm 512 are connected by a first rotating shaft 515, the second end of the first arm 512 opposite to its first end and the first end of the second arm 513 are connected by a second rotating shaft 516, and the second end of the second arm 513 opposite to its first end and one end of the actuator 514 are connected by a third rotating shaft 517. The mounting bases 511 of the first robotic arm 51 and the second robotic arm 52 are radially symmetrically and oppositely installed on the side wall of the rotating body 1, and the radiotherapy head 3 is located at an intermediate position between the mounting bases 511 of the first robotic arm 51 and the second robotic arm 52.

[0034] In an embodiment of the present utility model, each actuator 514 includes an actuating end extending outward and a mounting end opposite to its actuating end. A mounting plate 5141 is provided on the mounting end. The mounting plate 5141 is inserted between the U-shaped openings at the second end of the second arm 513 and is connected by a third rotating shaft 517. The actuating end of the first robotic arm 51 is fixedly connected to the bottom wall flange of the ray emitting device 41, so that the emission port 411 of the ray emitting device 41 is located on the axial direction of the corresponding actuator 514. A boss 521 is provided at the actuating end of the actuator 514 of the second robotic arm 52. A pair of connecting plates 522 are mounted on the boss 521. The connecting plates 522 are fixedly connected to the mounting surface 421 of the detection device 42, so that the detection device 42 is arranged perpendicular to the axial direction of the corresponding actuator 514.

[0035] In an embodiment of the present utility model, the support and adjustment mechanism of the treatment bed 2 realizes the positioning of the treatment bed 2 in the X, Y, and Z directions through a moving assembly, and makes the center of the part to be treated of the patient located on the rotation center axis of the rotating body 1.

[0036] In an embodiment of the present utility model, the ray emitting device 41 is a CT tube, and the detection device is a flat panel detector.

[0037] In an embodiment of the present utility model, a radiotherapy method including the above cone beam CT image-guided radiotherapy system includes the following steps:

[0038] The first step is to determine the patient's outer contour C and the pre-planned imaging trajectory T.

[0039] The treatment bed 2 enters the treatment space 11 of the rotating body 1. The optical body surface imaging device is used to obtain the outer contour C of the part to be treated (patient's lesion) of the patient on the treatment bed 2, and according to the preset distance L of the cone beam CT imaging, the planned imaging trajectory T of the image guiding component is obtained; the outer contour C is the outer contour line (approximately an ellipse) of the cross section of the patient corresponding to the position of the part to be treated, and the preset distance L is the distance from the ray emitting device 41 and the detection device 42 to the outer contour C, and the preset distance L is set to 5 - 15 cm.

[0040] The second step is to image the planned imaging trajectory T of the image guiding component and determine the exposure parameters of the ray emitting device 41.

[0041] The first movable connection component and the second movable connection component installed on the side wall of the treatment bed 2 that defines the treatment space 11 drive the image guiding component respectively installed on the first movable connection component and the second movable connection component to move to the planned imaging trajectory T. At this time, the position of the image guiding component on the planned imaging trajectory T is recorded as the initial position. According to the characteristics of the part to be treated, that is, the patient's lesion, and the preset distance L, the exposure parameters of the ray emitting device 41 of the image guiding component are calculated;

[0042] In the third step, the detection device 42 acquires the projection data y of the patient in .

[0043] According to the setting parameters of the first movable connection component and the second movable connection component, the maximum movement angle of the image guiding component along the planned imaging trajectory T from the initial position is obtained, and it is required that the maximum movement angle > the minimum imaging angle, and the minimum imaging angle is the minimum imaging angle of the image guiding component for the treatment site; plan the first movement path of the ray emitting device 41 along the planned imaging trajectory T, and set the second movement path of the detection device 42 of the image guiding component along the planned imaging trajectory T according to the first movement path, so that the rays emitted by the ray emitting device 41 pass through the patient and are received by the detection device 42, that is, the detection device 42 acquires the projection data y of the patient in ;

[0044] Please refer to Figure 2 , when the maximum movement angle of the image guiding component along the planned imaging trajectory T from the initial position still cannot satisfy the condition that the maximum movement angle > the minimum imaging angle, at this time, the rotating body 1 needs to rotate a certain angle Figure 2 The illustrated embodiment is to rotate the rotating body 1 Figure 1 by a certain angle to meet the requirement of the minimum imaging angle for the treatment site.

[0045] In the fourth step, three-dimensional image reconstruction

[0046] Perform three-dimensional image reconstruction according to the projection data y in , exposure parameters, the first movement path and the second movement path to obtain a three-dimensional CT image corresponding to the treatment site;

[0047] In the fifth step, patient positioning

[0048] According to the information of the three-dimensional CT image, further determine the position of the treatment site, and perform registration and comparison with the planned target area position. If there is an error, the patient is positioned so that the treatment site is located at the irradiation isocenter position of the radiotherapy head 3;

[0049] In the sixth step, radiotherapy

[0050] Use the radiotherapy head 3 to perform proton beam therapy on the treatment site.

[0051] In summary, for the cone beam CT image radiotherapy system provided by the present invention, the detection device 42 (flat panel detector) and the ray emission device 41 (CT tube) of the image guidance component are respectively installed at the execution ends of the first robotic arm 51 and the second robotic arm 52. The first robotic arm 51 and the second robotic arm 52 are six-degree-of-freedom robotic arms. Relative to the rotating body 1, the first robotic arm 51 and the second robotic arm 52 can perform 3 axial linear telescopic movements (horizontal axis, vertical axis, vertical axis) and 3 axial rotational movements (swing, pitch, roll) to adjust the position of the image guidance component in the treatment space 11 of the rotating body 1, changing the previous installation method of the image guidance component, that is, installing it on the side wall of the rotating body 1. When the image guidance component is installed on the side wall of the rotating body 1, if three-dimensional CT imaging is to be performed on the area to be treated, the rotating body 1 needs to be rotated. The radiotherapy head 3 is also installed on the side wall of the rotating body 1. Rotating the rotating body 1 will change the preset position of the radiotherapy head, affecting radiotherapy. Moreover, when performing three-dimensional CT imaging, the distances between the flat panel detector, the CT tube and the patient are fixed, which is not conducive to the imaging adjustment of the image guidance component. When solving the imaging of the image guidance component in the present invention, the preset distance L can be adjusted by the first robotic arm 51 and the second robotic arm 52 and the movement path during imaging can be planned. Moreover, the tube voltage and tube current of the CT tube can be further adjusted according to the preset distance L, ensuring imaging quality, saving resources, and reducing or even avoiding the adverse effects caused by the relatively increased radiation dose received by the patient's non-treatment position indirectly.

[0052] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A cone beam CT image radiotherapy system, characterized in that Comprising: A rotating frame, the rotating frame includes a rotating body (1), and the rotating body (1) is provided with a treatment space (11); A treatment couch (2), the bottom of the treatment couch (2) is provided with a support adjustment mechanism, and the support adjustment mechanism supports and adjusts the position of the treatment couch (2) relative to the treatment space (11); A radiotherapy head (3), the radiotherapy head (3) is fixedly installed on the side wall of the rotating body (1) that defines the treatment space (11), so that the rays of the radiotherapy head (3) irradiate at a preset position in the treatment space (11); A first image acquisition unit, the first image acquisition unit includes a ray emission device (41) and a first movable connection assembly, one end of the first movable connection assembly is installed on the side wall of the rotating body (1), and the other end is connected to the ray emission device (41); And A second image acquisition unit, the second image acquisition unit includes a detection device (42) and a second movable connection assembly, one end of the second movable connection assembly is installed on the side wall of the rotating body (1), and the other end is connected to the detection device (42); Wherein, the first movable connection assembly and the second movable connection assembly are respectively located on two opposite sides of the patient on the treatment couch (2) through telescoping and rotation, and move along the contour of the part to be treated of the patient, and at the same time, the rays emitted by the ray emission device (41) are received by the detection device (42) to detect an image of the part to be treated of the patient.

2. The cone beam CT image radiotherapy system according to claim 1, wherein The first movable connection assembly and the second movable connection assembly are respectively a six-degree-of-freedom first robotic arm (51) and a second robotic arm (52).

3. The cone beam CT image radiotherapy system according to claim 2, wherein The first robotic arm (51) and the second robotic arm (52) respectively include a mounting base (511), a first arm (512), a second arm (513) and an actuator (514).

4. The cone beam CT image radiotherapy system according to claim 3, wherein, The mounting base (511) and the first end of the first arm (512) are connected by a first rotating shaft (515), the second end of the first arm (512) opposite to its first end and the first end of the second arm (513) are connected by a second rotating shaft (516), and the second end of the second arm (513) opposite to its first end and one end of the actuator (514) are connected by a third rotating shaft (517).

5. The cone beam CT image radiotherapy system according to claim 4, wherein Each actuator (514) includes an extending execution end and a mounting end opposite to the execution end, and a mounting plate (5141) is provided on the mounting end. The mounting plate (5141) is inserted between the U-shaped openings at the second end of the second arm (513) and is connected by the third rotating shaft (517).

6. The cone beam CT image radiotherapy system according to claim 5, wherein, The mounting bases (511) of the first robotic arm (51) and the second robotic arm (52) are symmetrically mounted radially opposite on the side wall of the rotating body (1), and the radiotherapy head (3) is located at the intermediate position between the mounting bases (511) of the first robotic arm (51) and the second robotic arm (52).

7. The cone beam CT image radiotherapy system according to claim 6, wherein The first robotic arm (51) 's execution end is fixedly connected to the bottom wall flange of the ray emitting device (41), so that the emission port (411) of the ray emitting device (41) is located on the axis of the corresponding execution member (514).

8. The cone beam CT image radiotherapy system according to claim 7, wherein, The execution end of the execution member (514) of the second robotic arm (52) is provided with a boss (521), and a pair of connecting plates (522) are mounted on the boss (521). The connecting plates (522) are fixedly connected to the mounting surface (421) of the detection device (42), so that the detection device (42) is arranged perpendicular to the axis of the corresponding execution member (514).

9. The cone beam CT image radiotherapy system according to any one of claims 1-8, characterized in that, The support and adjustment mechanism of the treatment couch (2) realizes the positioning of the treatment couch (2) in the X, Y, and Z directions through the moving assembly, and makes the center of the part to be treated of the patient located on the rotation center axis of the rotating body (1).

10. The cone beam CT image radiotherapy system according to any one of claims 1-8, characterized in that, The ray emitting device (41) is a CT tube, and the detection device (42) is a flat panel detector.

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