CN218280334U - Radiotherapy system - Google Patents

Abstract

The present application relates to a radiotherapy system comprising: a conical rotating gantry rotatable about its axis of rotation; the self-shielding treatment head is arranged on the conical rotating frame; the self-shielding treatment head is internally provided with a plurality of radioactive sources, rays emitted by the radioactive sources are converged at a focus, and the focus is positioned on the rotating axis. The conical rotary drum radiotherapy system has larger treatment cavity space, so that the treatment range of the radiotherapy system can be enlarged.

Description

Radiotherapy system

Technical Field

The application relates to the technical field of medical equipment, in particular to a radiotherapy system.

Background

Radiation therapy is one of three main modalities of tumor treatment. Existing devices for radiation therapy primarily include a gamma knife and an accelerator. At present, a gamma knife is mainly used for treating head tumors, for example, as shown in fig. 1 and fig. 2, the gamma knife includes a shielding body 1, a rotatable source body 2 installed in the shielding body 1, and a rotatable collimating body 3 installed in the source body 2, the shielding body 1, the source body 2, and the collimating body 3 are all hollow hemispheroids, a plurality of radioactive source loading cavities and ray channels are arranged on the source body 2, gamma radioactive sources are loaded in the radioactive source loading cavities, gamma rays emitted by the gamma radioactive sources pass through the ray channels and are aligned with a common focus 5 from a radial direction, the common focus 5 is located on a central axis of a radiation unit, a rotatable central shaft 6 is arranged on the central axis of the radiation unit, and the central shaft 6 is respectively connected with the source body 2, the collimating body 3, and a power transmission mechanism by a transmission mechanism so as to rotate along the central shaft 6.

The existing radiotherapy system can realize the treatment of partial brain tumors and cannot realize the treatment of the whole brain.

Disclosure of Invention

The embodiment provides a radiotherapy system, which can realize the treatment of the head and neck in a wider range.

In this embodiment, a radiotherapy system is provided, comprising: a conical rotating gantry rotatable about its axis of rotation; the self-shielding treatment head is arranged on the conical rotating frame; the self-shielding treatment head is internally provided with a plurality of radioactive sources, rays emitted by the radioactive sources converge at a focus, and the focus is positioned on the rotating axis.

Illustratively, the self-shielding therapy head comprises: the plurality of radioactive sources are arranged in the shielding box body; the collimator is provided with a plurality of collimating holes; the rays emitted by the plurality of radioactive sources pass through the plurality of collimating holes to converge at a focus.

Illustratively, the self-shielding therapy head further comprises: the rotator sets up in the shielded cell box, and can for the shielded cell box rotates, a plurality of radiation sources set up on the rotator, through the rotation of rotator, realize the switch source of self-shielding treatment head.

Illustratively, the treatment head is deflectively installed on the conical rotating frame, so that a preset included angle exists between the lower end surface of the treatment head and the rotating axis of the conical rotating drum.

Illustratively, the radiotherapy system comprises two self-shielding treatment heads, and the focal points of the two self-shielding treatment heads coincide.

The imaging device comprises a bulb and a detector which are oppositely arranged on the conical rotating frame, and the focus is located in an imaging area of the imaging device.

Illustratively, the radio therapy system further comprises a first slip ring arrangement for providing power to at least the radio therapy system; and/or a second slip ring arrangement for transmitting signals at least to the radiotherapy system.

Illustratively, the signals include I/O signals and/or communication signals. Illustratively, the device further comprises a shielding layer, wherein the shielding layer is arranged on the outer side of the conical rotating frame.

Illustratively, the radiotherapy system further comprises a shielding layer disposed outside the conical rotating gantry.

Illustratively, the plurality of radiation sources are equidistant from the focal spot.

Compared with the related art, the radiotherapy system provided in the embodiment includes: a conical rotating gantry rotatable about its axis of rotation; the self-shielding treatment head is arranged on the conical rotating frame; the self-shielding treatment head is internally provided with a plurality of radioactive sources, rays emitted by the radioactive sources are converged at a focus, and the focus is positioned on the rotating axis. The conical rotary drum radiotherapy system has larger treatment cavity space, so that the treatment range of the radiotherapy system can be enlarged.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

figure 1 is a schematic view of a prior art radiotherapy apparatus;

FIG. 2 is a schematic view of a radiation source loading of a conventional radiotherapy apparatus;

figure 3 is a schematic view of a radiotherapy system provided in accordance with one embodiment of the present invention;

figure 4 is a schematic view of a radiotherapy system provided in accordance with another embodiment of the present invention;

figure 5 is a schematic view of a radiotherapy system provided in accordance with another embodiment of the present invention;

figure 6 is a schematic view of a radiotherapy system provided in accordance with another embodiment of the present invention;

FIG. 7 is a schematic diagram of a radiotherapy system comparing treatment chambers;

fig. 8 is a block diagram of a radiotherapy system according to another embodiment of the present invention.

Detailed Description

For a clearer understanding of the objects, aspects and advantages of the present application, reference is made to the following description and accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the same general meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of this application do not denote a limitation of quantity, either in the singular or the plural. The terms "comprises," "comprising," "has," "having," and any variations thereof, as referred to in this application, are intended to cover non-exclusive inclusions; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or modules, but may include other steps or modules (elements) not listed or inherent to such process, method, article, or apparatus. Reference throughout this application to "connected," "coupled," and the like is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. In general, the character "/" indicates a relationship in which the objects associated before and after are an "or". Reference in the present application to the terms "first," "second," "third," etc., merely distinguish between similar objects and do not denote a particular order or importance to the objects.

The present application provides a radiotherapy system 100, as shown in fig. 3, comprising: a rotating gantry 101, the rotating gantry 101 being rotatable about a rotation axis Y thereof; a treatment head 201 arranged on the rotating gantry 101, the treatment head 201 comprising a plurality of radiation sources 2011, the radiation emitted by the plurality of radiation sources 2011 converging to a focus O.

For example, the embodiment of the present application provides a rotating gantry 101, and as shown in fig. 4, the rotating gantry 101 is a conical rotating gantry. Illustratively, the rotating gantry 101 includes a gantry front end surface and a gantry back end surface, the gantry front end surface diameter being greater than the gantry back end surface diameter. As shown in fig. 4, one side close to the treatment couch is a front end face, and the other end is a rear end face. In the case of the same opening, as shown in fig. 7, the depth D2 of the conical drum frame is greater than the depth D1 of the hemispherical carrier body as in the background art. Therefore, the conical roller frame has larger depth of the treatment cavity, and the treatment range of the radiotherapy system is enlarged.

In some embodiments, as shown in fig. 4, the radiotherapy system 100 further comprises a stationary gantry 102, and the rotating gantry 101 may be rotatably connected with the stationary gantry 102 through a bearing to realize rotation. The rotating frame may be driven in rotation by a toothed ring gear, or by a friction wheel. The application does not limit the rotary connection mode and the rotary driving mode of the rotary frame.

For example, the present application provides a therapy head, as shown in fig. 3, the therapy head 201 includes a shielding box 2012 and a collimator 2013; the plurality of radioactive sources 2011 are arranged in the shielding box 2012, the collimator 2013 is provided with a plurality of collimation holes, and rays emitted by the plurality of radioactive sources 2011 pass through the plurality of collimation holes to converge at a focus.

For example, a plurality of groups of collimation hole groups with different sizes may be arranged on the collimator, each collimation hole group includes a plurality of collimation holes, and the position settings of the plurality of collimation holes correspond to the settings of the plurality of radioactive sources, so that the radiation emitted by each radioactive source passes through the collimation holes. The collimating hole sizes of different collimating hole groups are different, and the collimator can switch different collimating hole groups through movement so as to realize different field sizes at the focus position.

In an embodiment of a radiotherapy system provided by the present application, distances from the plurality of radiation sources to the focal point may be equal or unequal. The specification and the drawings of the application exemplify that the distances from a plurality of radioactive sources on the treatment head to the focus are equal. For example, as shown in fig. 4, the plurality of radiation sources are distributed on an arc with an equal radius with the focus O as the center, so that the distances from the plurality of radiation sources to the focus are equal. In one embodiment, the plurality of radiation sources may be divided into a plurality of groups, the plurality of radiation source groups being arranged along an axis perpendicular to the rotational axis of the rotating gantry (i.e., distributed along the rotational direction of the rotating gantry), each group including at least two radiation sources, the at least two radiation sources of each group being distributed along the axis of the rotational axis of the rotating gantry.

By way of example, the present application provides a treatment head, as shown in fig. 3, further including a rotating body 2014, the rotating body 2014 is disposed in the shielding box 2012 and can rotate relative to the shielding box 2012, and a plurality of radioactive sources 2011 are disposed on the rotating body 2014, and by the rotation of the rotating body 2014, the switching source of the treatment head is realized. Illustratively, when the rotating body rotates to position the plurality of radiation sources in the position shown in fig. 3, the radiation emitted from the radiation sources passes through the collimating holes and converges at the focus, thereby realizing the open source of the treatment head. When the rotating body rotates to enable the plurality of radioactive sources to be located at the position shown in fig. 5, rays emitted by the radioactive sources are shielded by the shielding box body, and therefore the treatment head is powered off. For example, the source may be mounted on a source cartridge that is in turn mounted on a rotating body. Therefore, the source box can be directly replaced under the condition of source replacement, and the radioactive source can be replaced at one time. The radioactive sources are prevented from being replaced one by one, so that the source replacing time is long, the radioactive sources are small, and the source replacing difficulty is high.

Because the radioactive source has radioactivity, the radioactive source has certain harm to human bodies. Therefore, the walls, doors, etc. of the room of the conventional radioactive medical equipment also need special treatment to shield the radioactive rays. The application provides a treatment head is for shielding the treatment head certainly, and the shielding box can realize the self-shielding of treatment head, realizes that the treatment head need not extra shielding or needs minimum extra shielding under the source state of closing. The self-shielding treatment head provided by the application can not completely shield the radioactive source in a source-off state, but can shield enough rays emitted by the radioactive source so as to reduce the shielding requirement on a machine room or a building. Therefore, the requirement on a machine room is reduced, and the position where the radiotherapy system can be installed has higher selectivity.

In a traditional radiotherapy system, a shielding door needs to be opened before a treatment bed enters a treatment cavity. The shielding door has certain shielding effect to realize that the radiation of the treatment room reaches safety index when not in treatment. The application provides a from shielding treatment head can realize under the state of closing the source, and under the condition that the radiotherapy system does not have the shield door, the radiation dose outside treatment intracavity and the treatment chamber is equivalent, all reaches the radiation safety index outside the treatment chamber. For example, a radiation dose of less than 200 microsieves at 5 cm from the device surface.

The application provides a radiotherapy system, includes: a conical rotating gantry rotatable about its axis of rotation; the self-shielding treatment head is arranged on the conical rotating frame; the self-shielding treatment head is internally provided with a plurality of radioactive sources, rays emitted by the radioactive sources are converged at a focus, and the focus is positioned on the rotating axis. The conical rotary drum radiotherapy system has larger treatment cavity space, so that the treatment range of the radiotherapy system can be enlarged. Compared with the existing radiotherapy system, the self-shielding treatment head simplifies the structure of the treatment head, and the weight of the treatment head is greatly reduced. In addition, the self-shielding treatment head can realize that the radiation doses in the treatment cavity and outside the treatment cavity are equivalent under the condition that the radiotherapy system does not have a shielding door, and the safety of the radiotherapy system is improved.

In some embodiments, the shielded enclosure includes a fixed shield and a movable shield, wherein the movable shield, when opened, enables installation of the radioactive source.

Additionally, in some embodiments, the shield is made of a shielding material. Wherein the shielding material may be configured (e.g., having a certain material density, a certain geometry, and/or a certain thickness) to block radiation such that at least 98%, and more preferably at least 99.9%, and even more preferably at least 99.999% of the radiation (e.g., photons/charged particles, such as electrons, neutrons, etc.) from the radiation source is reduced (attenuated).

In some embodiments, the radiotherapy system further comprises a shielding layer disposed outside the gantry to further shield the treatment head from radiation. Therefore, the requirement of the radiotherapy system on the machine room is further reduced, and the installation range of the radiotherapy system is expanded.

In the radiotherapy system provided by the present application, as shown in fig. 4, the treatment head 201 is deflectively mounted on the rotating gantry 101. Illustratively, as shown in fig. 4, the lower end surface of the treatment head and the rotation axis of the conical rotary drum form a preset included angle alpha, and the deflection installation angle alpha of the treatment head is smaller than 90 degrees. In the process of treating head tumor, eyes (sensitive tissues which may cause blindness due to ray irradiation) need to be avoided, so that the treatment head is deflectively arranged on the rotating frame, sensitive tissues such as the eyes can be prevented from being irradiated by rays, and normal organs can be protected to the maximum extent during radiotherapy.

In some embodiments, as shown in figure 6, the radiotherapy system 100 comprises two treatment heads 201, and the focal points of the two treatment heads 201 coincide. The radiotherapy system may also include one treatment head, or the radiotherapy system includes three or more treatment heads, and the number of the treatment heads included in the radiotherapy system is not limited in the present application, and is illustrated by taking two treatment heads shown in fig. 6 as an example. When the radiotherapy system comprises one treatment head, for example, as shown in fig. 3, the clump weights 301 may be disposed at opposite positions so that the radiotherapy system is in a relatively balanced state.

It should be noted that, when the radiotherapy system includes a plurality of treatment heads, the plurality of treatment heads may be the same or different. The embodiment and the drawings are exemplified by the case that the radiotherapy system comprises two identical treatment heads. The multiple treatment heads are different in emitting different radioactive rays (such as emitting gamma rays and emitting X rays), different in structure and different in installation angle.

In some embodiments, as shown in fig. 3, the radiotherapy system further comprises an imaging device, the imaging device comprises a bulb 401 and a detector 402 which are oppositely arranged on the rotating frame, and the focal point O is located in the imaging area of the imaging device. The imaging device can emit rays through the bulb tube, and the detector generates body image data of the patient after collecting the rays passing through the patient. To position the patient before treatment or to perform real-time tracking during treatment using the image data of the patient's body of the imaging device. In the application and the embodiment drawings, the imaging device comprises a bulb and a detector as an example, and in some embodiments, the imaging device also comprises two bulbs and two detectors, and rays emitted by the two bulbs are intersected, so that three-dimensional image data of the body of a patient can be reconstructed.

The multiple radioactive sources arranged in the treatment head of the radiotherapy system can be cobalt 60 radioactive sources, and the multiple cobalt 60 radioactive sources are arranged in the treatment head in a focusing mode, so that rays emitted by the multiple radioactive sources are converged at a focus. Generally, the treatment head is called a focusing treatment head, and the radiotherapy system with the focusing treatment head is called a gamma knife radiotherapy system.

In the related art, when the power supply and system signal transmission are performed in the rotary gamma-knife radiotherapy system, the power supply and transmission of various signals (such as control signals and communication signals) on the rotating body are realized by cables, signal lines and the like, and the cables are wound in the rotating process of the rotating body, so that the continuous 360-degree rotation cannot be realized.

Therefore, the embodiment of the application also provides a gamma knife radiotherapy system, which comprises a slip ring device used for transmitting signals to the gamma knife radiotherapy system. The signals transmitted by the slip ring include I/O signals (also known as I/O interlock signals) and/or communication signals (also known as communication protocols).

In the embodiment of the application, the slip ring device comprises a stator and a rotor, and the transmission of signals to a rotating body in the radiotherapy system is realized by utilizing sliding (or rolling) contact or electrostatic (or electromagnetic) coupling between the stator and the rotor through relative rotation between the stator and the rotor. The stator is arranged on a fixed rack of the radiotherapy system, the rotor is arranged on a rotating rack of the radiotherapy system, and signal transmission of radiotherapy equipment components on the rotating rack is realized through rotation of the rotating rack.

In the embodiment of the application, the gamma knife radiotherapy system adopts the slip ring device to realize the signal transmission of the radiotherapy system, and the cable winding cannot occur, so that the continuous 360-degree free rotation of the gamma knife radiotherapy system can be realized.

In some embodiments, the treatment head 201 of the present application is further provided with a motor, which may be a plurality of motors, for example: two motors can be arranged, wherein one motor can be used for driving the rotating body 2014 on the treatment head 201 to rotate so as to realize the switching of the treatment head 201; another motor can also be used to drive the collimator 2013 in the treatment head 201 to move so as to switch different collimation holes; of course, the motor can also be used to drive the collimator 2013 in the treatment head 201 to move to realize the on-off source of the treatment head 201.

Correspondingly, the radiotherapy system in this embodiment of the present application further includes a motor controller, as shown in fig. 8, the motor controller is disposed on the rotating rack, and the slip ring device is configured to transmit signals to the motor controller, for example, the signals may be transmitted as an interlock I/O signal, a real-time control communication signal, and the like.

In some embodiments, the imaging device of the present application further comprises a high voltage generator disposed on the rotating frame 101 for supplying power to the bulb 401 of the imaging device.

Correspondingly, the radiotherapy system in this embodiment of the present application further includes a high voltage generator controller, as shown in fig. 8, the high voltage generator controller is disposed on the rotating rack, and the slip ring device is configured to transmit signals to the high voltage generator controller, for example, the signals may be transmitted as an interlock I/O signal, a real-time control communication signal, and the like.

In some embodiments, the imaging device of the present application further includes an imaging controller, where the imaging controller includes an imaging server for acquiring and processing an image, and an exposure controller for controlling exposure. As shown in fig. 8, the image controller is disposed on the rotating frame 101, and the slip ring device is used for transmitting signals to the image controller, such as an interlock I/O signal, a real-time control communication signal, and a communication signal related to an image.

This application embodiment is through setting up motor controller, high voltage generator controller, image controller in rotatory frame for motor controller, high voltage generator controller, image controller are closer apart from motor, high voltage generator, image device, and the interference of signal is littleer, and signal transmission is more stable.

In some embodiments, the slip ring arrangement may also be used to power a radiotherapy system. When the slip ring device can provide power for the radiotherapy system and transmit signals to the radiotherapy system, one set of slip ring device can be adopted to realize power transmission and signal transmission simultaneously, and two sets of slip ring devices can be adopted to realize power transmission and signal transmission respectively. For example: the slip ring arrangement of the present application may comprise a first slip ring arrangement and a second slip ring arrangement, wherein the first slip ring arrangement is configured to power at least a radiotherapy system; the second slip ring device is used for transmitting signals at least to the radiotherapy system, in particular for transmitting communication signals to the radiotherapy system. The first slip ring arrangement may be a conductive slip ring and the second slip ring may be an industrial bus slip ring.

According to the embodiment of the application, signals, especially communication signals, are transmitted to the radiotherapy system through the slip ring device, and the transmission reliability of the communication signals is improved while the continuous 360-degree free rotation of the gamma knife radiotherapy system is realized.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A radiotherapy system, comprising:

a conical rotating gantry rotatable about its axis of rotation;

the self-shielding treatment head is arranged on the conical rotating frame;

the self-shielding treatment head is internally provided with a plurality of radioactive sources, rays emitted by the radioactive sources converge at a focus, and the focus is positioned on the rotating axis.

2. The radiotherapy system of claim 1, wherein the self-shielding treatment head comprises:

the shielding box body is internally provided with the plurality of radioactive sources;

the collimator is provided with a plurality of collimating holes;

the rays emitted by the plurality of radioactive sources pass through the plurality of collimation holes and are converged at the focus.

3. The radiation therapy system of claim 2, wherein said self-shielding treatment head further comprises:

the rotator sets up in the shielded cell box, and can for the shielded cell box rotates, a plurality of radiation sources set up on the rotator, through the rotation of rotator, realize the switch source of self-shielding treatment head.

4. The radiotherapy system of claim 1, wherein the treatment head is deflectively mounted on the conical rotating gantry such that a predetermined included angle exists between a lower end surface of the treatment head and a rotation axis of the conical rotating drum.

5. The radiotherapy system of claim 1, comprising two of the self-shielding treatment heads, the focal points of the two self-shielding treatment heads coinciding.

6. The radiotherapy system of claim 1, further comprising an imaging device comprising a bulb and a detector oppositely disposed on the conical rotating gantry, the focal point being located within an imaging region of the imaging device.

7. The radiotherapy system of claim 1, further comprising:

a first slip ring arrangement for providing power to at least the radiotherapy system; and/or the presence of a gas in the gas,

a second slip ring arrangement for transmitting signals at least to the radiotherapy system.

8. Radiotherapy system according to claim 7, characterized in that said signals comprise I/O signals and/or communication signals.

9. The radiation therapy system of claim 1, further comprising a shielding layer disposed outside of the conical rotating gantry.

10. The radiation therapy system of claim 1, wherein said plurality of radiation sources are equidistant from said focal spot.

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