CN116440427A - Radiotherapy apparatus - Google Patents

Abstract

The application provides a radiotherapy equipment, including support body, bed body, radiation portion and drive control portion, be provided with the centre bore on the support body, drive control portion is connected with support body and bed body respectively for the axis of drive support body with the centre bore is rotation center, and the extending direction of the axis of synchronous drive bed body along the centre bore removes, and the radiation portion sets up on the support body, in order to make radiation portion and support body synchronous rotation. The radiotherapy equipment has the advantages that the driving control part is respectively connected with the frame body and the bed body, the driving control part can synchronously drive the bed body to move along the extending direction of the central axis of the central hole when the driving frame body rotates by taking the central axis of the central hole as the rotation center, so that the radiation part can do spiral motion relative to a patient, the problem of low treatment precision caused by the division of the radiation field and the problem of low treatment efficiency of spiral tomography are solved, the irradiation of the whole tumor focus is completed in one irradiation, and the treatment efficiency and the treatment precision are obviously improved.

Description

Radiotherapy apparatus

Technical Field

The application belongs to the technical field of medical equipment, and particularly relates to radiation therapy equipment.

Background

Radiation therapy is one of the main means of treating tumors, and an electron linear accelerator is the main device for realizing radiation therapy. After electrons are accelerated in an acceleration tube of a linear accelerator, the electrons strike a target made of heavy metal material, and X-rays are generated. The X-ray is collimated by the collimator and then is injected into the tumor focus to kill cancer cells, thus achieving the purpose of treatment.

In order to increase the control rate of the tumor, it is necessary to irradiate as many rays as possible onto the tumor lesion while minimizing the radiation damage to healthy tissue. There are a number of therapeutic techniques currently used to achieve this goal, including three-dimensional conformal radiation therapy, intensity modulated radiation therapy, volume modulated radiation therapy, tomotherapy, and the like. These treatment techniques all rely on the limiting of the rays by a multi-leaf collimator (multileaf collimator); different treatment technologies are realized by controlling the positions of the leaves of the multi-leaf collimator, the projection angles of rays and the dose rate of rays, and the expected clinical purpose is achieved.

In three-dimensional conformal radiation therapy, the leaves of the multi-leaf collimator remain stationary during the treatment, and the projection angle and dose rate of the radiation remain unchanged. In intensity modulated radiation therapy, the leaves of the multi-leaf collimator are dynamically changed in position during the treatment, and the projection angle and dose rate remain unchanged. In volume-modulated radiation therapy, the leaf positions, projection angles, and dose rates of the multi-leaf collimator are dynamically changed. These treatment techniques are all intended to bring the dose distribution and the shape of the tumor lesion as close as possible.

In these techniques, the volume of lesions that can be treated each time is actually dependent on the aperture of the multi-leaf collimator, and for lesions that are longer than the collimator aperture, the aforementioned treatment techniques are limited in use. Typically the aperture of a multi-leaf collimator is 40cm x 40cm, a tumour lesion is envisaged which is 45cm in the sup/inf direction, at least 2 isocenter points need to be set at the time of treatment planning design, the spacing between the 2 isocenter points being 30cm. In this case, the various treatment techniques described above cannot be completed with one irradiation for the entire tumor lesion.

Tomotherapy is another radiation therapy technique, the principle of which is described in the text Tomotherapy A new concept for the delivery of dynamic conformal radiotherapy T.rock Mackie et al Medical Physics, 1709 (1993). Unlike the cone beam used in the foregoing conformal radiation treatment techniques, the tomotherapy uses a fan beam, and the tomotherapy uses a two-position multi-leaf collimator, i.e., the leaves of the collimator only block the beam and do not block the beam by 2 states, to temporally modulate the intensity of the fan beam, thereby obtaining the desired dose distribution. In contrast, in the technologies of conformal radiotherapy and the like, the blades of the multi-blade collimator continuously move in the field, so that the modulation of the beam intensity in space is realized.

In tomotherapy, the beam is rotated around the patient and the patient table is movable at a predefined speed in a direction parallel to the beam axis of rotation, so that the source moves helically with respect to the patient.

The implementation mode of the tomographic radiotherapy is suitable for treating tumor focus of a long target area, and can solve the problem of cold spots or hot spots in the traditional method. For the foregoing examples of lesions, treatment of the entire lesion may be accomplished in one shot using tomotherapy.

For the radiation treatment of the aforementioned long-focus tumor, if conventional conformal radiation treatment, intensity modulated radiation treatment and volume modulated radiation treatment are used, at least 2 radiation fields should be designed, and there is a 10cm overlap between the 2 radiation fields to eliminate "cold spots" or "hot spots" in the border region of the radiation fields.

The disadvantage of tomotherapy is that in order to achieve a sufficient dose in the tumor focal region, a relatively large output dose is required relative to volume-modulated radiation therapy, which lengthens the treatment time and reduces the efficiency of the treatment.

When technical schemes such as conformal radiation therapy, volume intensity modulated radiation therapy and the like are used for realizing focus therapy of a long target area, the positioning precision of a patient needs to be accurately controlled, and the connection position precision between 2 radiation fields is ensured so as to avoid cold spots or hot spots. The whole treatment process is more complicated, and the treatment accuracy is reduced.

Thus, there is a need for a radiotherapy apparatus that enables treatment of a long target volume to be completed in one irradiation and that ensures good treatment efficiency and treatment accuracy.

Disclosure of Invention

Therefore, the technical problem to be solved by the present application is to provide a radiotherapy apparatus, so that the treatment of a long target region can be completed in one irradiation, and good treatment efficiency and treatment accuracy are ensured.

In order to solve the above problems, the present application provides a radiotherapy apparatus, including a frame, a bed, a radiation part, and a driving control part, where the frame is provided with a central hole, the driving control part is respectively connected with the frame and the bed, and is used to drive the frame to rotate with a central axis of the central hole as a rotation center, and synchronously drive the bed to move along an extension direction of the central axis of the central hole, and the radiation part is disposed on the frame, so that the radiation part and the frame synchronously rotate;

the radiation part comprises a radiation source and a collimator, the collimator is arranged on one side of the radiation source, which is close to the central axis of the central hole, the radiation emitted by the radiation source irradiates the target area through the aperture of the collimator, and the collimator can rotate by taking the central axis of the radiation source as a rotation center so as to adjust the irradiation angle of the radiation source to the target area.

Optionally, the relation between the speed of the bed body moving along the extending direction of the central axis of the central hole and the rotating speed of the frame body rotating with the central axis of the central hole as the rotating center is: v (V) _{Bed with a bed body} (t)＝V _{Frame body} (t)×Pitch；

Wherein V is _{Bed with a bed body} (t) is the speed of the bed body moving along the extending direction of the central axis of the central hole, V _{Frame body} And (t) is the rotating speed of the frame body rotating by taking the central axis of the central hole as a rotating center, and Pitch is a set constant.

Optionally, the radiotherapy apparatus further includes a detection portion and a control portion, the detection portion is electrically connected with the control portion, the detection portion is configured to obtain current angle information of the frame body and send the current angle information to the control portion, and the control portion is connected with the driving control portion, so that the driving control portion is controlled to drive the frame body and the bed body to move according to the obtained current angle information.

Optionally, the detection portion is connected with the support body, so as to obtain the current angle information of the support body, the control portion includes a first control unit, the first control unit respectively with the detection portion with drive control portion electric connection, the first control unit is used for receiving the current angle information that the detection portion obtained, and based on current angle information control drive control portion drives the support body rotates with correction rotational speed.

Optionally, the control part further includes a second control unit, where the second control unit is electrically connected to the detection part and the driving control part, and the second control unit is configured to receive the current angle information obtained by the detection part, and control the driving control part to drive the bed body to correct the moving speed based on the current angle information.

Optionally, the drive control portion includes a first driving piece, the first driving piece with the support body is connected, a first driving piece with first control unit electric connection, first control unit control a first driving piece drives the support body with the radial portion uses the axis of centre bore is the synchronous rotation of rotation center.

Optionally, the radiation source and the collimator synchronously rotate along with the frame body by taking the central axis of the central hole as a rotation center, and the light transmission area of the aperture of the collimator is adjustable.

Optionally, the radiation source further includes an accelerating tube, and the driving control part includes a second driving member, where the second driving member is connected with the collimator, so as to drive the collimator to rotate with a central axis of the accelerating tube as a rotation center.

Optionally, the collimator and the accelerating tube are coaxially arranged, the collimator is rotationally connected to the radioactive source and/or the frame body through a rotating member, and the second driving member is connected to the collimator through the rotating member, so as to drive the collimator to rotate by taking a central axis common to the accelerating tube and the collimator as a rotation center.

Optionally, the drive control portion includes a third driving piece, the third driving piece with the bed body is connected, the third driving piece with second control unit electric connection, the second control unit control the third driving piece drives the bed body is followed the extending direction of the axis of centre bore removes.

Advantageous effects

According to the radiotherapy equipment provided by the embodiment of the invention, the driving control part is arranged and is respectively connected with the frame body and the bed body, so that the frame body is driven to rotate by taking the central axis of the central hole as the rotation center, and the driving control part synchronously drives the bed body to move along the extending direction of the central axis of the central hole, so that the radiotherapy part can do spiral motion relative to a patient, the problem of low treatment precision caused by beam segmentation and the problem of low spiral fault radiotherapy efficiency are solved, the irradiation of the whole tumor focus is completed in one irradiation, and the treatment efficiency and the treatment precision are remarkably improved. Through setting up radiation source and collimator, make the collimator set up in the radiation source be close to the one side of the axis of centre bore, can collimate the ray that the radiation source sent through the collimator, and then make the accurate injection of collimated ray in the tumour focus, kill cancer cell, protect normal tissue, reach the treatment purpose. The collimator can rotate by taking the central axis of the radioactive source as the rotation center so as to adjust the irradiation angle of the radioactive source to the target area, so that the rays can be more accurately irradiated on the target area, the irradiation precision is further improved, and normal tissues are greatly protected while cancer cells are killed.

Drawings

FIG. 1 is a schematic view of the structure of a frame and a bed according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an irradiation treatment apparatus according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a collimator according to an embodiment of the present application.

The reference numerals are expressed as:

1. a frame body; 11. a central bore; 12. a radiation section; 121. a radiation source; 122. a collimator; 1221. an aperture; 2. a bed body; 3. and a control unit.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.

Referring to fig. 1 in combination, according to an embodiment of the present application, there is provided a radiotherapy apparatus including a frame 1, a bed 2, a radiation portion 12, and a driving control portion, where a central hole 11 is provided on the frame 1, the driving control portion is respectively connected to the frame 1 and the bed 2, and is configured to drive the frame 1 to rotate with a central axis of the central hole 11 as a rotation center, and synchronously drive the bed 2 to move along an extension direction of the central axis of the central hole 11, and the radiation portion 12 is provided on the frame 1, so that the radiation portion 12 and the frame 1 synchronously rotate;

the radiation part 12 includes a radiation source 121 and a collimator 122, the collimator 122 is disposed on one side of the radiation source 121 near the central axis of the central hole 11, the radiation emitted by the radiation source 121 irradiates the target area via an aperture 1221 of the collimator 122, and the collimator 122 can rotate with the central axis of the radiation source 121 as a rotation center to adjust the irradiation angle of the radiation source 121 to the target area.

By providing the drive control unit and connecting the drive control unit with the frame 1 and the bed 2, the drive control unit can synchronously drive the bed 2 to move along the extending direction of the central axis of the central hole 11 while the drive frame 1 rotates with the central axis of the central hole 11 as the rotation center, so that the radiation unit 12 can do spiral motion relative to the patient. It is possible to irradiate a tumor target area exceeding the aperture 1221 of the collimator 122 in the direction of movement along the longitudinal direction of the bed in one irradiation, thereby achieving irradiation of the entire tumor lesion in one irradiation. The problems of low treatment accuracy caused by beam segmentation and low spiral tomography treatment efficiency are solved. The treatment efficiency and the treatment precision are obviously improved. Through setting up radiation source 121 and collimator 122, make collimator 122 set up in the side of the axis that radiation source 121 is close to centre bore 11, can collimate the ray that radiation source 121 sent through collimator 122, and then make the accurate injection of collimated ray in the tumour focus, kill cancer cell, protect normal tissue, reach the treatment purpose. The collimator 122 can rotate with the central axis of the radiation source 121 as a rotation center to adjust the irradiation angle of the radiation source 121 to the target area, so that the radiation can be more accurately irradiated on the target area, the irradiation accuracy is further improved, and normal tissues are greatly protected while cancer cells are killed.

When the patient bed is used, the patient can lie on the bed body 2, the bed body 2 moves along the axial direction of the central hole 11, and the radiation part 12 can do spiral motion relative to the patient by matching with the synchronous rotation of the radiation part 12 along with the frame body 1. The radiotherapy apparatus thus enables continuous irradiation of the tumor lesions distributed along the axial direction of the central bore 11.

The central hole 11 is a circular hole, the central hole 11 is horizontally arranged, and the central axis of the central hole 11 is a horizontal line.

The driving control part drives the bed body 2 to move into the central hole along the extending direction of the central axis of the central hole 11, so that the patient enters the central hole, and then the patient can be treated by the radiation part 12.

Wherein the radiation source 121 is disposed toward the central axis of the central hole 11.

The collimator 122 is disposed on one side of the radiation source 121 near the central axis of the central hole 11, and is used for collimating the radiation emitted by the radiation source 121, the radiation source 121 emits radiation toward the central axis direction of the central hole 11, and the radiation is collimated by the collimator 122 and then is emitted to the focus.

In particular, the clinical objective of adjusting the dose distribution deposited into the target area of the patient is achieved by controlling the position of the leaves in the collimator 122 and the angle of the leaves relative to the radiation source 121, as well as controlling the output dose rate of the radiation source.

The relation between the speed of the movement of the bed 2 along the extending direction of the central axis of the central hole 11 and the rotating speed of the frame 1 rotating with the central axis of the central hole 11 as the rotating center is: v (V) _{Bed with a bed body} (t)＝V _{Frame body} (t) ×pitch; wherein V is _{Bed with a bed body} (t) is the speed of the movement of the bed 2 along the extending direction of the central axis of the central hole 11, V _{Frame body} (t) is the rotational speed at which the frame body 1 rotates about the center axis of the center hole 11, and Pitch is a set constant.

The choice of Pitch will be determined by the specific tumor lesion distribution.

Integrating the above, the relation between the feeding distance of the bed and the angular position of the frame body 1 can be obtained:

∫v _{bed body} (t)dt＝Pitch×∫V _{Frame body} (t)dt

S _{Bed body} (t)＝Pitch×∫V _{Frame body} (t)dt

Wherein S is _{Bed body} And (t) is the expected position of the bed body at the moment t.

As shown in fig. 2, the radiotherapy apparatus further includes a detection portion and a control portion 3, the detection portion is electrically connected with the control portion 3, the detection portion is configured to obtain current angle information of the frame 1 and send the current angle information to the control portion 3, and the control portion 3 is connected with the driving control portion, so as to control the driving control portion to drive the frame 1 and the bed 2 to move according to the obtained current angle information.

The current angle information of the frame body 1 is obtained through the detection part, the obtained current angle information is sent to the control part 3, the control part 3 can control the frame body 1 and the bed body 2 to move according to the current angle information, and then linkage of the frame body 1 and the bed body 2 is realized, so that the frame body 1 and the bed body 2 form a follow-up system, the movement speed of the bed body 2 can be changed according to the change of the rotation speed of the frame body 1, the movement pitch formed by the bed body 2 and the radiation part 12 can be still guaranteed to keep good precision when the rotation speed of the frame body 1 changes, and further good irradiation precision of the radiation part 12 is guaranteed.

The current angle information may be a rotation speed or a rotation angle when the current frame 1 rotates with the central axis of the central hole 11 as a rotation center.

Specifically, the detecting unit may obtain the current rotation speed of the frame 1, and send the obtained current rotation speed to the control unit 3, where the control unit 3 may compare the current rotation speed with the preset rotation speed. And if the current rotating speed is greater than the preset rotating speed, controlling the first driving piece to reduce the speed until the newly acquired current rotating speed is equal to the preset rotating speed. And if the current rotating speed is smaller than the preset rotating speed, controlling the first driving piece to accelerate until the newly acquired current rotating speed is equal to the preset rotating speed.

Specifically, one or more detection points may be set on the frame body 1, and when the detection points are plural, the detection points may be uniformly set along the circumferential direction of the frame body 1, where the detection unit is configured to obtain the current rotation angle of the frame body 1 through the detection points, and send the obtained current rotation angle to the control unit 3, where the control unit 3 may compare the current rotation angle with a preset angle. If the current rotation angle is larger than the preset angle, the rotation angle is overlarge, and the first driving piece is controlled to slow down until the newly acquired current rotation angle is equal to the preset angle. If the current rotation angle is smaller than the preset angle, the rotation angle is too small, and the first driving piece is controlled to accelerate until the newly acquired current rotation angle is equal to the preset angle.

In the present embodiment, the current angle information is exemplified by the rotational speed when the current frame body 1 rotates about the central axis of the central hole 11 as the rotation center.

The detection part is connected with the frame body 1 to acquire the current angle information of the frame body 1, and the control part 3 comprises a first control unit, wherein the first control unit is respectively and electrically connected with the detection part and the driving control part, and the first control unit is used for receiving the current angle information acquired by the detection part and controlling the driving control part to drive the frame body 1 to rotate at a corrected rotating speed based on the current angle information.

Through setting up first control unit, can realize based on the rotational speed of current angle information accurate control support body 1, guarantee that the motion pitch that bed body 2 and radial portion 12 formed jointly keeps good precision, and then guaranteed good treatment.

The detection part can be an angle sensor, and the output form of the detection part can be a pulse signal, a voltage signal or directly output angle information and the like.

Wherein the first control unit controls the rotational speed and rotational position of the frame body 1 based on the current angle information output from the detection section.

The rotation of the correction rotation speed can be a preset rotation speed or a rotation speed set according to actual conditions in treatment.

Specifically, in the treatment, when the deposition dose in the current angle range needs to be lifted, the correction rotation speed can be set when the dose rate is lifted to the maximum, and the correction rotation speed is smaller than the current rotation speed, so that the rotation speed of the frame body 1 is reduced to the correction rotation speed. On the contrary, when the dosage rate needs to be reduced in treatment, the rotating speed of the frame body 1 can be increased to the correcting rotating speed by setting the correcting rotating speed and enabling the correcting rotating speed to be larger than the current rotating speed.

The driving control part is controlled to drive the frame body 1 to rotate at a corrected rotation speed based on the current angle information, namely, the current angle information is compared with the corrected rotation speed, and the first driving part is controlled to accelerate or decelerate based on the comparison structure.

The control part 3 further comprises a second control unit, the second control unit is respectively and electrically connected with the detection part and the driving control part, and the second control unit is used for receiving the current angle information acquired by the detection part and controlling the driving control part to drive the bed body 2 to correct the moving speed based on the current angle information.

Through setting up the second control unit to make the second control unit be used for receiving the current angle information that the detection portion obtained, and control drive control portion drive the bed body 2 in order to correct and move fast rotation based on current angle information, and then realize the linkage of support body 1 and bed body 2, make support body 1 and bed body 2 form a follow-up system, can change according to the rotational speed of support body 1, change the movement speed of bed body 2, guarantee still can guarantee when support body 1 rotational speed changes that the movement pitch that bed body 2 and radiation portion 12 formed jointly keeps good precision, and then guarantee the good irradiation precision of radiation portion 12.

The detection part sends the acquired current frame angle information to the first control unit and synchronously sends the current frame angle information to the second control unit, so that the second control unit can synchronously and respectively control the movement speeds of the frame body 1 and the bed body 2 with the first control unit, and further the follow-up of the frame body 1 and the bed body 2 is realized.

The second control unit comprises a generator and a controller, the generator is used for generating position and speed information of the bed body 2, and the generated position and speed information of the bed body 2 is sent to the controller to further control the third driving piece to drive the bed body 2 to move.

Wherein, the correction shift speed is the rotational speed of the bed body 2 produced based on the pre-stored focus information and the current angle information.

The detection part acquires current angle information in real time, and when the rotating speed of the frame body 1 is changed due to the difference between the rotating speed and the correction rotating speed, the detection part acquires new current angle information and transmits the new current angle information to the second control unit, and the second control unit produces new correction moving speed in real time, so that the follow-up of the bed body 2 and the frame body 1 is realized.

The drive control part comprises a first driving piece, the first driving piece is connected with the frame body 1, the first driving piece is electrically connected with the first control unit, and the first control unit controls the first driving piece to drive the frame body 1 and the radiating part 12 to synchronously rotate by taking the central axis of the central hole 11 as a rotation center.

Through setting up first driving piece to make first driving piece be connected with support body 1, and with first control unit electric connection, and then can be controlled by first control unit and drive support body 1 radiation portion 12 and regard the axis of centre bore 11 as rotation center synchronous rotation, guaranteed the steady rotation of support body 1 and radiation portion 12, and then guaranteed that the radial that radiation portion 12 sent can accurately arrive focus department, realize the treatment accurately.

The first driving piece drives the frame body 1 to rotate by taking the central axis of the central hole 11 as a rotation center. The radiating part 12 is fixedly connected with the frame body 1, so that the first driving piece drives the frame body 1 and the radiating part 12 to synchronously rotate.

Wherein the first driving member may comprise a stepping motor and a speed reducer or an alternating current servo motor and a speed reducer or a linear motor.

The radiation source 121 and the collimator 122 rotate synchronously with the frame body 1 by taking the central axis of the central hole 11 as a rotation center, and the light passing area of the aperture 1221 of the collimator 122 is adjustable.

Wherein the light-passing area of the aperture 1221 of the collimator 122 is adjustable, i.e. the light-passing area of the aperture 1221 of the collimator 122 can be continuously changed. Specifically, as shown in fig. 3, the collimator 122 includes a plurality of blades, and the blades move to open to form an aperture 1221, and the radiation can pass through the aperture 1221 to irradiate the focus.

The radiation source 121 further includes an accelerating tube, and the driving control part includes a second driving member connected to the collimator 122 to drive the collimator 122 to rotate with the central axis of the accelerating tube as a rotation center.

By arranging the second driving piece and enabling the second driving piece to drive the collimator 122 to rotate by taking the central axis of the accelerating tube as the rotation center, the angle of the collimator aperture 1221 relative to the radioactive source is changed, and the focus can be covered better.

Wherein the emitting end of the accelerating tube is arranged towards the central axis of the central hole 11.

The second driving element may be a high-precision driving control component, for example, a high-precision motor, where the high-precision motor has high motion accuracy, and the output shaft of the high-precision motor can move in a small increment, so that high-precision movement is realized, and the collimator 122 can be driven to rotate more accurately, thereby ensuring a good therapeutic effect.

Wherein, the accelerating tube can be a straight-line extending tubular structure.

The collimator 122 is coaxially arranged with the accelerating tube, the collimator 122 is rotatably connected to the radiation source 121 and/or the frame 1 through a rotating member, and the second driving member is connected with the collimator 122 through a rotating member to drive the collimator 122 to rotate by taking the central axis of the accelerating tube and the collimator 122 as a rotation center.

By setting the collimator 122 and the accelerating tube to be coaxial, when the collimator 122 rotates with the central axis of the accelerating tube as the rotation center, the accurate irradiation of rays can be ensured, and the rays are prevented from deviating from the focus. By providing a swivel, a good connection stability of the collimator 122 is ensured.

The rotating member may be a shaft or a gear set.

The rotating member may be rotatably disposed on the radiation source 121 or the frame 1, or may be simultaneously rotatably disposed on the radiation source 121 and the frame 1.

Specifically, the collimator 122 is rotatably connected to the radiation source 121 and/or the frame 1 through a rotating member, the second driving member is connected to a power input end of the rotating member, a power output end of the rotating member is connected to the collimator 122, and the second driving member drives the rotating member to move so as to drive the collimator 122 to move.

The driving control part comprises a third driving piece, the third driving piece is connected with the bed body 2, the third driving piece is electrically connected with the second control unit, and the second control unit controls the third driving piece to drive the bed body 2 to move along the extending direction of the central axis of the central hole 11.

Through setting up the third driving piece to make the third driving piece be connected with the bed body 2, and make third driving piece and second control unit electric connection, can realize that the axial movement along the centre bore 11 of the third driving piece drive bed body 2 is controlled through the second control unit, and then cooperate radiation source 121 and collimator 122 to rotate along the circumference of centre bore 11, can realize that radiation source 121 and collimator 122 are helical motion for the patient, can carry out continuous irradiation to the tumour focus in the axial of centre bore 11, realize accomplishing the irradiation of whole tumour focus in one shot, treatment effeciency and treatment precision obtain showing and promote.

Wherein the third driving member may comprise a stepping motor.

At least a part of the moving path of the bed 2 is located in the central hole 11, so that the radiation part 12 can treat the patient on the bed 2.

Wherein the central axis of the central hole 11 and the central axis of the bed body 2 extending along the length direction are positioned in the same vertical plane.

According to the radiotherapy equipment provided by the embodiment of the invention, the driving control part is arranged and is respectively connected with the frame body 1 and the bed body 2, so that the driving control part can synchronously drive the bed body 2 to move along the extending direction of the central axis of the central hole 11 while the driving frame body 1 rotates by taking the central axis of the central hole 11 as the rotation center, the radiation part 12 can further spirally move relative to a patient, the problem of low treatment precision caused by beam segmentation and the problem of low spiral tomography radiation treatment efficiency are solved, the irradiation of the whole tumor focus is completed in one irradiation, the treatment efficiency and the treatment precision are obviously improved, the radiation source 121 and the collimator 122 are arranged on one side of the radiation source 121 close to the central axis of the central hole 11, the radiation emitted by the radiation source 121 can be collimated by the collimator 122, the collimated radiation can be accurately injected into the tumor focus, cancer cells are killed, normal tissues are protected, and the treatment purpose is achieved. The collimator 122 can rotate with the central axis of the radiation source 121 as a rotation center to adjust the irradiation angle of the radiation source 121 to the target area, so that the radiation can be more accurately irradiated on the target area, the irradiation accuracy is further improved, and normal tissues are greatly protected while cancer cells are killed.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.

Claims (10)

1. The radiotherapy equipment is characterized by comprising a frame body (1), a bed body (2), a radiation part (12) and a driving control part, wherein a central hole (11) is formed in the frame body (1), the driving control part is respectively connected with the frame body (1) and the bed body (2) and is used for driving the frame body (1) to rotate by taking a central axis of the central hole (11) as a rotation center and synchronously driving the bed body (2) to move along the extending direction of the central axis of the central hole (11), and the radiation part (12) is arranged on the frame body (1) so as to enable the radiation part (12) and the frame body (1) to synchronously rotate;

the radiation part (12) comprises a radiation source (121) and a collimator (122), the collimator (122) is arranged on one side, close to the central axis of the central hole (11), of the radiation source (121), rays emitted by the radiation source (121) irradiate on a target area through an aperture (1221) of the collimator (122), and the collimator (122) can rotate by taking the central axis of the radiation source (121) as a rotation center so as to adjust the irradiation angle of the radiation source (121) to the target area.

2. The radiotherapy apparatus according to claim 1, characterized in that the relation between the speed at which the couch (2) moves in the direction of extension of the central axis of the central bore (11) and the rotational speed at which the gantry (1) rotates with the central axis of the central bore (11) as the rotation center is: v (V) _{Bed with a bed body} (t)＝ _{Frame body} (t)×Pitch；

Wherein V is _{Bed with a bed body} (t) is the speed of the bed body (2) moving along the extending direction of the central axis of the central hole (11), V _{Frame body} And (t) is the rotating speed of the frame body (1) rotating by taking the central axis of the central hole (11) as a rotating center, and Pitch is a set constant.

3. The radiotherapy apparatus according to claim 2, further comprising a detection part and a control part (3), wherein the detection part is electrically connected with the control part (3), the detection part is used for acquiring current angle information of the frame body (1) and sending the current angle information to the control part (3), and the control part (3) is connected with a driving control part so as to control the driving control part to drive the frame body (1) and the bed body (2) to move according to the acquired current angle information.

4. The radiotherapy apparatus according to claim 3, characterized in that the detection part is connected with the frame body (1) to obtain the current angle information of the frame body (1), the control part (3) comprises a first control unit, the first control unit is electrically connected with the detection part and the driving control part respectively, and the first control unit is used for receiving the current angle information obtained by the detection part and controlling the driving control part to drive the frame body (1) to rotate at a corrected rotation speed based on the current angle information.

5. The radiotherapy apparatus according to claim 4, characterized in that the control unit (3) further comprises a second control unit, the second control unit is electrically connected with the detection unit and the driving control unit, respectively, and the second control unit is configured to receive the current angle information acquired by the detection unit, and control the driving control unit to drive the bed body (2) to move at a corrected speed based on the current angle information.

6. The radiotherapy apparatus of claim 4, characterized in that the driving control portion comprises a first driving member, the first driving member is connected with the frame body (1), the first driving member is electrically connected with the first control unit, and the first control unit controls the first driving member to drive the frame body (1) and the radiation portion (12) to rotate synchronously with the central axis of the central hole (11) as a rotation center.

7. The radiotherapy apparatus of claim 1, characterized in that the radiation source (121) and the collimator (122) rotate synchronously with the frame body (1) with the central axis of the central hole (11) as a rotation center, and the light passing area of the aperture (1221) of the collimator (122) is adjustable.

8. The radiotherapy apparatus of claim 7, characterized in that the radiation source (121) further comprises an acceleration tube, and the drive control section comprises a second driving member, and the second driving member is connected to the collimator (122) to drive the collimator (122) to rotate about a central axis of the acceleration tube as a rotation center.

9. The radiotherapy apparatus of claim 8, characterized in that the collimator (122) is coaxially arranged with the accelerating tube, the collimator (122) is rotatably connected to the radiation source (121) and/or the frame (1) by a rotating member, and the second driving member is connected to the collimator (122) by the rotating member, so as to drive the collimator (122) to rotate about a central axis common to the accelerating tube and the collimator (122).

10. The radiotherapy apparatus of claim 5, characterized in that the driving control section comprises a third driving member, the third driving member is connected with the bed body (2), the third driving member is electrically connected with the second control unit, and the second control unit controls the third driving member to drive the bed body (2) to move along the extending direction of the central axis of the central hole (11).