CN116899120A

CN116899120A - Source device and radiotherapy system

Info

Publication number: CN116899120A
Application number: CN202310746310.7A
Authority: CN
Inventors: 高凡
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-10-20

Abstract

The application discloses a source device and a radiation therapy system, which comprises a rotatable source carrier and a plurality of radiation sources fixedly arranged on the source carrier, wherein the source carrier is hinged with a plurality of treatment parts which point to the same focus and can only rotate circumferentially but not move axially, the treatment parts are distributed and arranged in different latitudes, each treatment part comprises a plurality of radiation sources positioned at the rear end and a collimation body positioned at the front end, the collimation body is provided with a plurality of collimation holes which can be opposite to the radiation sources, the collimation body can only rotate circumferentially but not move axially, the radiation sources are uniformly distributed in different latitudes, during treatment, the treatment parts can independently rotate and focus, the rear end of the source carrier is connected with a power mechanism for driving the treatment parts to rotate, and finally, a quadruple rotation focusing mode of independent rotation focusing of the treatment parts and rotation focusing of the source carrier is formed, so that the damage of rays to normal brain tissues is dispersed to the maximum extent, and the patient is benefited.

Description

Source device and radiotherapy system

Technical Field

The application relates to the technical field of medical treatment, in particular to a source device and a radiation therapy system.

Background

The existing radiotherapy system for treating the head mainly comprises a head gamma knife, wherein the head gamma knife emits gamma rays by using a natural isotope radioactive source cobalt-60, and kills tumor cells by using the radioactivity of the rays. However, the normal tissues or cells are damaged by the radiation, so that the existing head gamma knife comprises 30 or 180 radiation sources, the radiation sources respectively emit beams from different directions and focus on a common focus, the radiation dose rate at the common focus is maximum, and the damage of the beams emitted by each radiation source to the normal tissues or cells is smaller, thereby achieving the purpose of killing tumor cells and protecting the normal tissues or cells at the same time, and realizing the tumor treatment effect.

The gamma knife is called a knife, and the gamma knife uses the principle of space multi-source rotary focusing to disperse the share (damage) of the normal brain tissue during the radiation therapy, thereby forming the characteristic of very high central (focus) dose and very low peripheral dose, and achieving the effect like knife cutting.

As shown in fig. 1, the conventional head gamma knife is formed by dispersing a plurality of dispersed radiation sources locally on a hemispherical source device a, and a patient lies on a treatment bed B, as shown in fig. 2, the head of the patient extends into the source device a and is positioned at the focus of the radiation C emitted by a plurality of radiation sources 3, the source device a focuses the radiation by 1-time rotation focusing, the radiation C is distributed in a limited angle range (generally, 14-43 degrees of latitude distribution), and the radiation is not distributed in a larger range to the whole spherical space, so that the degree of dispersion of the radiation to normal brain tissue injury is limited, and side reactions during treatment are correspondingly increased.

For the defects of the traditional head gamma knife, chinese patent publication No. CN113082559A discloses a source carrier, a collimation body, a source device and a radiation therapy system, wherein the source device comprises the source carrier and the collimation body; the source carrier is provided with a plurality of radioactive sources, and the included angle of the plurality of radioactive sources in the longitudinal direction is within a preset included angle range; the collimating body is provided with a plurality of collimating aperture groups, and the included angle of each collimating aperture group in the longitudinal direction is within a preset included angle range; each collimation hole group comprises a plurality of collimation holes, and beams emitted by a plurality of radioactive sources pass through the collimation holes of the collimation hole groups and then intersect at a common focus. Because the plurality of radioactive sources are distributed in the range of the preset included angle in the longitudinal direction, the plurality of radioactive sources can be driven by the source carrying body to rotate along the central axis of the radiotherapy equipment, so that the radioactive sources can be turned off when passing through sensitive tissues or organs; the radioactive source is opened when passing through normal tissue organs, so that sensitive tissue organs such as eyes can be protected in the treatment process of head tumors, and extra injuries are avoided. However, this structure has the disadvantage that the closing of the individual sources must be performed by rotation of the central axis, which is slow and also causes some damage to sensitive tissues and organs.

Those skilled in the art are therefore working to develop a source device and radiation therapy system that have fewer side effects and are more accurate in treatment.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present application is directed to providing a radiation source device and a radiation therapy system with less side effects and more accurate treatment.

In order to achieve the above purpose, the application provides a source device, which comprises a rotatable source carrier and a plurality of radioactive sources fixedly arranged on the source carrier, wherein the source carrier is hinged with a plurality of treatment parts which point to the same focus and can only rotate circumferentially but not move axially, the plurality of treatment parts are distributed in different latitudes, the treatment parts comprise a plurality of radioactive sources positioned at the rear end and a collimating body positioned at the front end, the collimating body is provided with a plurality of collimating holes which can be opposite to the radioactive sources, the collimating body can only rotate circumferentially but not move axially, and the radioactive sources are uniformly distributed in different latitudes.

Further, the treatment subsections are provided with four, and the treatment subsections comprise a first treatment subsection, a second treatment subsection, a third treatment subsection and a fourth treatment subsection.

Further, the collimating aperture has four different diameter specifications, 4mm, 9mm, 16mm and 25mm, respectively.

Further, in the first treatment subsection, a plurality of the radiation sources are arranged along a latitude of 12 ° to 29 °, and a latitude interval between two adjacent radiation sources is 2 °.

Further, in the second treatment subsection, a plurality of the radiation sources are arranged along a latitude of 30 ° to 47 °, and a latitude interval between two adjacent radiation sources is 2 °.

Further, in the third treatment subsection, a plurality of the radiation sources are arranged along a latitude of 48 ° to 65 °, and a latitude interval between two adjacent radiation sources 3 is 2 °.

Further, in the fourth treatment subsection, a plurality of the radiation sources are arranged along a latitude of 66 ° to 75 °, and a latitude interval between two adjacent radiation sources is 1 °.

Further, in the same treatment section, 9 radiation sources are provided, and all the radiation sources are arranged along a straight line.

Further, in the same treatment subsection, 9 radiation sources are arranged, the 9 radiation sources are divided into three groups which are arranged along three different straight lines, and an included angle between two adjacent groups is 120 degrees.

The application also provides a radiation therapy system, which comprises the radiation source device, wherein the radiation source is fixedly arranged on a source carrying body, and the collimation body is connected with a power mechanism for driving the collimation body to rotate.

The beneficial effects of the application are as follows: the application relates to a radiation source device and a radiation therapy system, which comprises a rotatable carrier source body and a plurality of radiation sources fixedly arranged on the carrier source body, wherein the carrier source body is hinged with a plurality of therapy parts which point to the same focus and can only rotate circumferentially but not move axially, the therapy parts are distributed in different latitudes, each therapy part comprises a plurality of radiation sources positioned at the rear end and a collimation body positioned at the front end, the collimation body is provided with a plurality of collimation holes which can be opposite to the radiation sources, the collimation body can only rotate circumferentially but not move axially, the radiation sources are uniformly distributed in different latitudes, during therapy, the therapy parts can independently rotate and focus, the rear end of the carrier source body is connected with a power mechanism for driving the therapy parts to rotate, and finally, a quadruple rotation focusing mode of independent rotation focusing of the therapy parts and rotation focusing of the carrier source body is formed, so that the damage of rays to normal brain tissues is dispersed to the maximum extent, and the therapy benefit of patients is finally realized.

Drawings

FIG. 1 is a schematic view of a conventional head gamma knife of the prior art;

FIG. 2 is a structural cross-sectional view of a conventional head gamma knife according to the prior art;

FIG. 3 is a schematic diagram of the radiation therapy system of the present application;

FIG. 4 is a schematic diagram of a source device according to the present application;

FIG. 5 is a second schematic view of the source device of the present application;

FIG. 6 is a schematic view of a first arrangement of radiation sources of the treatment segment of the present application;

fig. 7 is a schematic view of a second arrangement of radiation sources of the treatment segment of the present application.

Detailed Description

The present application will be further described with reference to the drawings and examples, and it should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present application and simplifying 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 manner, and thus should not be construed as limiting the present application. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 3 to 7, a source device includes a rotatable source carrier 1 and a plurality of radiation sources 3 fixedly mounted on the source carrier 1, the source carrier 1 is hinged with a plurality of treatment sections 2 which are directed at the same focus and can only rotate circumferentially but not move axially, the plurality of treatment sections 2 are distributed and arranged in different latitudes, the treatment sections 2 include a plurality of radiation sources 3 positioned at the rear end and a collimation body 4 positioned at the front end, the collimation body 4 is provided with a plurality of collimation holes 5 which can be opposite to the radiation sources 3, the collimation body 4 can only rotate circumferentially but not move axially, the radiation sources 3 are uniformly distributed and arranged in different latitudes, during treatment, the treatment sections 2 can independently rotate and focus, the rear end of the source carrier is connected with a power mechanism which drives the treatment sections to rotate, and finally forms a quadruple rotation focusing mode of independent rotation focusing of the treatment sections and rotation focusing of the source carrier, so that the damage of radiation to normal brain tissues is dispersed to the maximum extent, and the patient is treated and benefited.

In the application, the treatment part 2 can be arranged into two or more than two, the rear end of each treatment part 2 is provided with the rotating shaft 8, the treatment part 2 is connected with a power device for driving the treatment part 2 to rotate, the power device is generally a stepping motor, and the rotating shaft of the stepping motor is axially and fixedly connected with the rotating shaft 8, so that the stepping motor can drive the treatment part 2 to rotate automatically, and as the treatment part 2 is provided with two or more than two radiation sources which are spaced at a certain distance and matched with collimating holes with different diameters, a larger and more complete irradiation range is provided as far as possible and focused on a public focus as far as possible, so that other human tissues can not be injured while the focus is irradiated.

In this embodiment, preferably, the treatment section 2 is provided with four, the rear end of the treatment section 2 is provided with a rotation shaft 8, the treatment section 2 is connected with a power device for driving the treatment section 2 to rotate, the treatment section includes a first treatment section 21, a second treatment section 22, a third treatment section 23 and a fourth treatment section 24, each treatment section includes 9 radiation sources 3, two ways of arranging the 9 radiation sources 3, the first way is that all the radiation sources 3 are arranged along a straight line, the second way is that the 9 radiation sources 3 are divided into three groups arranged along three different straight lines, an included angle between every two adjacent groups is a, and then a is 120 degrees, so that the radiation sources are more dispersed and have less damage to human bodies.

In the first treatment subsection 21, 9 radiation sources 3 are arranged along the latitude 12-29 degrees, and the latitude interval between two adjacent radiation sources 3 is 2 degrees; in the second treatment subsection 22, 9 radiation sources 3 are arranged along the latitude of 30-47 degrees, and the latitude interval between two adjacent radiation sources 3 is 2 degrees; in the third treatment subsection 23, 9 radiation sources 3 are arranged along the latitude of 48-65 degrees, and the latitude interval between two adjacent radiation sources 3 is 2 degrees; in the fourth treatment section 24, 9 radiation sources 3 are arranged along a latitude of 66 ° to 75 °, and a latitude interval between two adjacent radiation sources 3 is 1 °.

Since a plurality of treatment sections 2 are provided and the treatment sections 2 include a plurality of radiation sources 3, different arrangements and combinations can be formed, and accordingly, the collimating holes 5 are generally cylindrical through holes with various cross-sectional diameters for matching to achieve a better irradiation angle. However, in this embodiment, it is preferable that the collimation hole 5 has four specifications with different diameters, which are respectively 4mm, 9mm, 16mm and 25mm, and the collimation holes 5 with different specifications are selected according to different sizes of the operation site, and the rear end of the treatment part 2 is provided with a rotation shaft 8, and the treatment part 2 is connected with a power device for driving the treatment part 2 to rotate, and the power device is generally a stepping motor, and the rotation shaft of the stepping motor is axially and fixedly connected with the rotation shaft 8, so that the stepping motor can drive the treatment part 2 to rotate independently, and thus, when the radiation source 3 is not aligned with the collimation hole 5, the source closing operation can be realized, and when the alignment of the collimation hole 5 is performed, the source opening operation can be realized.

As shown in fig. 3 to 7, the present application further provides a radiation therapy system, which includes the above-mentioned radiation source device, the radiation source 3 is fixedly installed on a source carrier 6, the collimator 4 is connected with a first power mechanism 8 that drives the collimator to rotate, the rear end of the radiation source device is connected with a second power mechanism 9 that drives the collimator to rotate, and the first power mechanism 8 and the second power mechanism 9 are both motors.

The radiation therapy system provided by the application further comprises a shielding body 11, wherein the shielding body 11 is positioned at one side of the source device, and a beam emitted by the radiation source passes through the public focus and is shielded by the shielding device. As shown in fig. 3, for example, the shielding device is located at one side of the common focal point of the source device, and the beam emitted by the radiation source passes through the common focal point and is shielded by the shielding body 11, so as to avoid redundant radiation in the treatment room. For example, if the shielding 11 is a ring, the radiation source is received by the shielding 11 while rotating around the central axis. Alternatively, the shield 11 is a shield block that is rotatable along the central axis of the source device to follow the rotation of the source to receive radiation after passing through the common focal point. It should be noted that, when the treatment couch carries the patient to move, the shielding device 11 is provided with a channel to facilitate the movement of the treatment couch.

The radiation therapy system provided by the application further comprises a shielding door 10, wherein the shielding door 10 can open or close a cavity of the radiation therapy system. As shown in fig. 3, for example, the shielding door 10 may be disposed outside the cavity of the source device, and may be opened or closed up and down, or opened or closed left and right. So that during non-treatment times the beam can be shielded by the shielding gate 10. The present application is not limited to the specific installation position of the shield door 10, and will be exemplified by way of example only as shown in fig. 3.

The radiation therapy system provided by the application, as shown in fig. 3, is also provided with an anti-sinking component between the collimation body and the source carrier. Further, the source device further comprises a shielding body positioned outside the source carrying body, and an anti-sinking assembly is further arranged between the shielding body and the source carrying body. For example, the anti-sag assembly may be a bearing to avoid sagging of the collimator and carrier when one end is driven in rotation.

The collimating body provided by the application has the advantages that the collimating holes on the inner collimating body are straight holes, and/or the collimating holes on the outer collimating body are conical holes. For example, the inner collimating body may be a straight hole, and the outer collimating body may be a straight hole; or the inner collimating body is a straight hole, and the outer collimating body is a taper hole; or the inner collimating body and the outer collimating body are taper holes.

According to the collimator provided by the application, the shielding body 11 is arranged at the shielding position, and the material density of the shielding body 11 is greater than that of the collimator. For example, the shielding body 11 is fixedly connected with the collimating body, and the shielding body 11 may be composed of a tungsten block or a lead block or an alloy thereof. The collimator body may be composed of cast iron. So that the shielding 11 enables a better shielding of the radiation source. Regarding the description of the carrier and the collimator, only the above is taken as an example, and the setting manner of the carrier and the collimator may also be used in the cylindrical source rotating shaft, which is not described herein.

The radiation therapy system provided by the application comprises a source carrier and/or a collimation body which are composed of a plurality of fragments. For example, the radiation source may be located on one of the segments of the source carrier, or the segment may be moved in the direction of the central axis of the source device. The collimating body may also be composed of a plurality of segments, and the collimating body may include a plurality of collimating hole groups, where each collimating hole group is correspondingly disposed on one segment, or a plurality of collimating hole groups are disposed on one segment. Alternatively, the alignment body may be further provided with a relevant source, and a group of alignment holes and a relevant source may be provided on a segment.

The radiation therapy system provided by the application can also be a sheet-shaped carrier, namely one of the fragments. The specific shape of the carrier is not limited in the present application.

The foregoing describes in detail preferred embodiments of the present application. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the application by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. The utility model provides a source device, includes rotatable carrier source body (1) and a plurality of radiation source (3) of fixed mounting on carrier source body (1), its characterized in that: the utility model discloses a radiation source, including carrying source body (1), support body (1) and radiation source, it has a plurality of directional same focus and can only circumferential direction rotate but not axial displacement's treatment subsection (2), a plurality of treatment subsection (2) are different latitude distribution setting, treatment subsection (2) are including a plurality of that is located the rear end radiation source (3) and the collimation body (4) that are located the front end, collimation body (4) are provided with a plurality of can just right collimation hole (5) of radiation source (3), collimation body (4) can only circumferential direction rotate but can not axial displacement, radiation source (3) are different latitudinally evenly and arrange the setting.

2. The source device of claim 1, wherein: the treatment subsections (2) are provided with four, and comprise a first treatment subsection (21), a second treatment subsection (22), a third treatment subsection (23) and a fourth treatment subsection (24).

3. The source device of claim 2, wherein: the collimating aperture (5) has four different diameter specifications, 4mm, 9mm, 16mm and 25mm respectively.

4. The source device of claim 2, wherein: in the first treatment subsection (21), a plurality of radiation sources (3) are arranged along the latitude of 12-29 degrees, and the latitude interval between two adjacent radiation sources (3) is 2 degrees.

5. The source device of claim 2, wherein: in the second treatment subsection (22), a plurality of the radiation sources (3) are arranged along the latitude of 30-47 degrees, and the latitude interval between two adjacent radiation sources (3) is 2 degrees.

6. The source device of claim 2, wherein: in the third treatment subsection (23), a plurality of the radiation sources (3) are arranged along the latitude of 48-65 degrees, and the latitude interval between two adjacent radiation sources (3) is 2 degrees.

7. The source device of claim 2, wherein: in the fourth treatment subsection (24), a plurality of the radiation sources (3) are arranged along the latitude of 66-75 degrees, and the latitude interval between two adjacent radiation sources (3) is 1 degree.

8. The source device of claim 2, wherein: in the same treatment subsection (2), 9 radiation sources (3) are arranged, and all the radiation sources (3) are arranged along a straight line.

9. The source device of claim 2, wherein: in the same treatment subsection (2), the radiation sources (3) are provided with 9, and the 9 radiation sources (3) are divided into three groups which are arranged along three different straight lines, and the included angle between two adjacent groups is 120 degrees.

10. A radiation therapy system, characterized by: a source device as claimed in any one of claims 1 to 9, wherein the radiation source (3) is fixedly mounted on a source carrier (6), and the collimator (4) is connected to a power mechanism for driving the collimator to rotate.