CN113144442B

CN113144442B - Collimation body, source device and radiotherapy system

Info

Publication number: CN113144442B
Application number: CN202110506493.6A
Authority: CN
Inventors: 刘海峰; 李大梁
Original assignee: Our United Corp
Current assignee: Our United Corp
Priority date: 2018-08-24
Filing date: 2018-08-24
Publication date: 2023-07-18
Anticipated expiration: 2038-08-24
Also published as: CN113082558B; CN109157761B; CN113082558A; CN113082559B; CN113230547B; WO2020038073A1; CN113082559A; CN113144442A; CN109157761A; CN113230547A

Abstract

The application discloses a collimation body, a source device and a radiotherapy system, and belongs to the technical field of medical treatment. A radiation therapy system comprises a source device and an imaging device, wherein the source device comprises a source carrying body and a 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; the common focus is located outside the end face of the source device, the imaging device is arranged on one side of the source device along the rotation axis direction of the source device, and the common focus is located in the imaging area of the imaging device.

Description

Collimation body, source device and radiotherapy system

The present application is a divisional application of China application with the name of "a radiation therapy system" and having an application number 201810971119.1 and an application date of 2018, 8, 24.

Technical Field

The present application relates to the field of medical technology, and in particular, to a collimator, a source device, and a radiation therapy system.

Background

With the development of medical technology, radiation therapy is increasingly being applied to the treatment of tumors.

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.

However, because the treatment space of the head gamma knife is smaller, only the head can be accommodated, and the imaging device cannot be installed in the treatment space, whether the patient moves in the existing monitoring treatment process is monitored by arranging a reflecting device on the body surface of the human body and utilizing infrared rays. However, the accuracy requirement of head treatment is very high, generally about 0.1mm, the error of body surface monitoring is large, and the clinical high accuracy requirement is difficult to meet.

Disclosure of Invention

The application provides a collimation body, a source device and a radiation therapy system, which can protect sensitive tissue organs in the treatment process. The technical scheme is as follows:

in one aspect, a collimator is provided, the collimator includes an inner collimator and an outer collimator, the collimating aperture on the inner collimator is a straight aperture, and the collimating aperture on the outer collimator is a tapered aperture.

The collimating body comprises a plurality of collimating aperture groups, each collimating aperture group comprises a plurality of collimating apertures, and the included angle between two adjacent collimating apertures is 2-15 degrees.

For example, the included angle of each collimating aperture group in the longitudinal direction is within a preset included angle range.

The predetermined angle is, for example, in the range of 5 ° to 60 °.

Another method provides a source device, a source carrier and a collimator, where the source carrier is provided with a plurality of radiation sources, and the collimator is any one of the collimator provided in the embodiments of the present application, and beams emitted by the plurality of radiation sources intersect at a common focal point after passing through each collimating hole of the collimating hole set.

Illustratively, the carrier and the collimator may be rotated 360 ° circumferentially or reciprocally about the central axis of the source device.

For example, the source carrier and/or the collimator may be movable in the direction of the central axis of the source device.

Illustratively, the plurality of radiation sources may have an angle in the latitudinal direction in the range of 20 ° to 60 °.

Illustratively, the source device further includes a source cartridge having a plurality of radiation sources fixedly disposed thereon;

and an active box position is arranged in the range of a preset included angle of the source carrying body in the longitudinal direction, and the active box position is matched with the shape of the source box.

In yet another aspect, there is provided a radiation therapy system comprising a source device as defined in any one of the claims provided herein and an imaging device, the common focal point of the source devices being located within an imaging region of the imaging device.

The imaging device is exemplified by any one of an X-ray imaging device, a CT imaging device, an ultrasound imaging device, a DSA imaging device, an MR imaging device, a PET imaging device, or any combination thereof.

For example, the imaging device comprises two X-ray tubes and two X-ray plates correspondingly receiving the beams emitted by each X-ray tube, wherein the beams emitted by the two X-ray tubes intersect at a common focus; alternatively, the imaging device comprises an X-ray tube and an X-ray plate corresponding to the beam emitted by the X-ray tube.

Illustratively, the imaging device is rotatable along the source device central axis.

The radiation therapy system, for example, further includes a shielding device, the radiation source beam passing through the common focal point and then being shielded by the shielding device.

Illustratively, the carrier and the collimator may reciprocate or 360 ° circumferentially rotate about a central axis of the diffraction source assembly. The beneficial effects that this application provided technical scheme brought are:

the application provides a radiation therapy system, on the one hand, public focus is located the terminal surface of source device outside, and imaging device sets up in the one side of source device along the rotation axis direction of source device, and public focus is located imaging device's imaging region, can image the patient's tumour that is located imaging region through imaging device, confirm accurately according to the image that the patient takes place the displacement to and specific direction and the distance of removal are so that patient's tumour is located public focus through the relocation of removal treatment couch.

On the other hand, the source device comprises a source carrying body and a 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.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an existing radiotherapy apparatus according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a conventional source device according to an embodiment of the present disclosure;

fig. 3 is a schematic top view of a conventional carrier according to an embodiment of the present application;

FIG. 4 is a schematic top view of a collimating body according to an embodiment of the present disclosure;

fig. 5 is a schematic view of a carrier according to an embodiment of the present application;

FIG. 6 is a schematic view of a collimating body according to an embodiment of the present application;

FIG. 7 is a schematic view of a collimating body according to an embodiment of the present application;

FIG. 8 is a schematic view of another radiation therapy system provided in an embodiment of the present application;

FIG. 9 is a schematic view of another carrier provided in an embodiment of the present application;

FIG. 10 is a schematic view of another collimator provided in an embodiment of the present application;

FIG. 11 is a schematic view of another radiation therapy system provided in an embodiment of the present application;

FIG. 12 is a schematic view of another radiation therapy system provided in an embodiment of the present application;

fig. 13 is a schematic diagram of another switch according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The existing radiotherapy equipment for head tumor has the principle that the radiotherapy of the head tumor is shown in fig. 1 and 2, a plurality of radioactive sources are arranged on a source carrier body, beams emitted by the radioactive sources are intersected at a common focus after passing through a collimation hole on a collimation body, and the common focus is positioned in a cavity of a source device of the radiotherapy equipment. The treatment couch is used to carry the patient and move it into the treatment cabin of the source device so that the patient's focus is located at the intersection for radiation treatment.

The source carrier of the existing radiotherapy equipment is bowl-shaped as shown in fig. 3, the radioactive sources are divided into six groups, each group comprises 30 radioactive sources in total of five sources, and the sources are distributed on the source carrier. The collimating body is shown in fig. 4, and is provided with six groups of collimating channel groups, the six groups of collimating channel groups correspond to the six groups of radioactive sources in position, each collimating channel group comprises four subgroups, the collimating holes of one subgroup are filled with solid tungsten rods to realize source-closing shielding, the other subgroups comprise 5 collimating holes, and the collimating holes of different subgroups are different in size.

On the one hand, in the treatment process, because the treatment space of the source device is smaller, only the head can be accommodated, and the imaging device cannot be installed in the treatment space, so that whether a patient moves in the existing monitoring treatment process is monitored by arranging the reflecting device on the surface of the human body and utilizing infrared rays. However, the accuracy requirement of head treatment is very high, generally about 0.1mm, the error of body surface monitoring is large, and the clinical high accuracy requirement is difficult to meet.

On the other hand, the carrier and the collimator can be driven to rotate mutually to switch the collimating holes with different sizes and shield the radioactive source by the collimator to realize the switching source during treatment, but the size of the six groups of collimating holes is switched and the switching source is switched at the same time, so that one group of collimating holes cannot be controlled independently. Therefore, during treatment, the eyes (sensitive tissue organs) are avoided only by adjusting the gamma angle so that the rays avoid the eyes.

The radiation therapy system comprises a source device and an imaging device, wherein the source device comprises a source carrying body and a 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.

The common focus is located outside the end face of the source device, the imaging device is arranged on one side of the source device along the rotation axis direction of the source device, and the common focus is located in the imaging area of the imaging device.

In one aspect, as shown in fig. 8, 11 and 12, the common focal point is located outside the end face of the source device, the imaging device is disposed on one side of the source device along the rotation axis direction of the source device, the common focal point is located in the imaging region of the imaging device, that is, the tumor of the patient located in the imaging region can be imaged by the imaging device, whether the patient is displaced or not can be precisely confirmed according to the image, and the specific direction and distance of the movement are determined, so that the tumor of the patient is located at the common focal point by repositioning by moving the treatment couch.

In addition, the source device comprises a source carrying body and a 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.

The source device and the imaging device are described in detail below.

In this application, the source device may be bowl-shaped or cylindrical, as shown in fig. 8, and the source carrier may be bowl-shaped, as shown in fig. 5, and the collimator may be bowl-shaped, as shown in fig. 6, with the longitudinal direction of the source carrier and the collimator being the direction of the longitudinal direction of 0 ° -360 ° as shown by the arrow in the figure. Alternatively, the source device may be cylindrical, as shown in fig. 11, the carrier may be cylindrical, as shown in fig. 9, and the collimator may be cylindrical, as shown in fig. 10, with the longitudinal direction of the carrier and the collimator being the direction of the longitudinal direction of 0 ° -360 ° as shown by the arrow in the figure. In fig. 11, the two ends of the circular truncated cone have the same size, but may be different in size, as shown in fig. 12. The specific shape of the source device is not limited in this application, and the above is merely an example.

Taking the radiotherapy apparatus shown in fig. 8 as an example, the range of the included angle of the present application is described. As shown in fig. 5, the angle of the radiation source in the longitudinal direction is an angle formed by taking the center of the radiation source as a reference. It should be noted that, if the radiation source includes a row and centers of a plurality of radiation sources located in the same row are on the same longitudinal line, an included angle of the plurality of radiation sources in the longitudinal direction is considered to be zero degrees, and in this application, a preset included angle range is equal to or greater than zero degrees. As shown in fig. 6, the angle of the collimator in the longitudinal direction is an angle formed by taking the center of the collimator as a reference. It should be noted that, if the collimating body includes a row and centers of the collimating bodies located in the same row are on the same longitudinal line, an included angle of the collimating bodies in the longitudinal direction is considered to be zero degrees, and in this application, a preset included angle range is greater than or equal to zero degrees.

As shown in fig. 5, in the source carrier provided in the present application, a plurality of radiation sources are disposed on the source carrier, and an included angle of the plurality of radiation sources in a longitudinal direction is a. Illustratively, the preset included angle range A can be 15-60 degrees, that is, 15-60 degrees, the preset included angle range A can be any included angle within the range of 15-60 degrees, illustratively, the preset included angle range A can be 5-60 degrees, that is, 5-60 degrees, the preset included angle range A can be any included angle within the range of 5-60 degrees, illustratively, the preset included angle range A can be 5-, 8-, 10-, 12-, 18-, 20-, 25-, 30-, 40-, 45-, 50-or 60-degrees. The number and arrangement of the radiation sources are not limited in this application, and the number of the corresponding radiation sources may be generally 20-180, for example 30 or 180. Only 20 radiation sources are illustrated in fig. 5.

For example, as shown in fig. 5, a bowl-shaped collimating body provided in the present application is taken as an example, where 4 collimating hole groups are disposed on the collimating body, and each of the collimating hole groups is a (1) collimating hole group, a (2) collimating hole group, a (3) collimating hole group, and a (4) collimating hole group, and each of the collimating hole groups includes 24 collimating holes and corresponds to the distribution of the radioactive sources. Taking the collimating aperture set (1) as an example, beams emitted by a plurality of radioactive sources intersect at a common focal point after passing through each collimating aperture of the collimating aperture set (1). Wherein, the included angles of the collimating hole group (1), the collimating hole group (2), the collimating hole group (3) and the collimating hole group (4) in the longitudinal direction are within the preset included angle range, and fig. 5 takes the collimating hole group (1) as an example, the included angle of the collimating hole group (1) in the longitudinal direction (the arrow direction shown in fig. 5) is a, and the preset included angle range a is 5 ° -60 ° with the preset included angle of the radiation source of the carrier.

The collimating body is provided with a plurality of collimating aperture groups, and may be provided with two or more collimating aperture groups, and fig. 6 illustrates only 4 collimating aperture groups provided on the collimating body. Each collimation hole group comprises a plurality of collimation holes, and the number and the arrangement mode of the plurality of collimation holes corresponding to the radioactive sources are corresponding to the plurality of radioactive sources on the source carrier, so that the beams emitted by the radioactive sources penetrate through the collimation holes and then intersect at a common focus.

For example, as shown in fig. 11, the source device may be cylindrical, and as shown in fig. 9, the source carrier may be cylindrical as shown in fig. 9, and the longitudinal direction thereof is the direction indicated by the arrow in fig. 9. In fig. 9, the cylindrical source carrier has two ends of the same size. The specific number and arrangement of the radiation sources are not limited, and only 20 radiation sources are illustrated in fig. 9. The collimating body may also be cylindrical as shown in fig. 10, and the plurality of collimating holes corresponds to the number and arrangement of the radiation sources, which are not described herein. The number of the collimating aperture groups on the collimating body is not limited in this application, and in fig. 10, two collimating aperture groups are disposed on the collimating body, and each collimating aperture group includes 20 collimating apertures for example and is illustrated.

Of course, the source device may be a cylindrical source device as shown in fig. 12, and in fig. 12, the sizes of both ends of the cylindrical source carrier are different.

On the one hand, in the radiotherapy system provided by the application, a plurality of radioactive sources are arranged on the radiotherapy equipment, a plurality of collimation hole groups are arranged on the collimation body, and the included angle of the longitudinal direction of the radioactive sources is within the range of a preset included angle; the radiation therapy equipment can drive the radiation sources to rotate along the central axis of the radiation therapy equipment through the source carrying body when the radiation sources pass 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.

A specific example of the carrier provided in the present application is illustrated in fig. 5.

For example, in the longitudinal direction of the source carrier provided by the application, the plurality of radioactive sources are divided into a plurality of groups, and the included angle range of two adjacent groups of radioactive sources is 2-15 degrees. In the example, among the plurality of sets of radiation sources, any two adjacent sets of radiation sources have the same included angle, or the different adjacent sets of radiation sources have different included angles, which is not limited in this application, and fig. 5 is only an illustration. As shown in fig. 5, the plurality of radiation sources are divided into 5 groups, and the included angle between two adjacent groups of radiation sources is exemplified by B (fig. 5 illustrates two groups), and the included angle B may be 2 ° -15 °, that is, 2 ° -B is less than or equal to 15 °, the preset included angle B may be any included angle within the range of 2 ° -15 °, and the preset included angle B may be 2 °, 2.5 °, 3, 5 °, 6 °, 8 °, 10 °, 12 or 15 °.

The included angle range of the plurality of radioactive sources in the latitude direction of the carrier body is 20-60 degrees. As an example, as shown in fig. 5, the source carrier is provided with a plurality of radiation sources within a preset range C in the longitudinal direction. The preset included angle range C may be, for example, 20 ° -60 °, i.e., 20 ° -C-60 °, the preset included angle range C may be any included angle within the range of 20 ° -60 °, for example, 20 °, 25 °, 30 °, 38 °, 40 °, 45 °, 50 °, 53 °, or 60 °.

By way of example, the carrier provided by the application has an included angle in the latitude direction between any two adjacent radiation sources of 1-10 degrees. For example, in the multiple sets of radiation sources, the angles between any two adjacent sets of radiation sources in the latitudinal direction are the same, or the angles between any two adjacent sets of radiation sources in the latitudinal direction are different, which is not limited in this application, and fig. 5 is only an illustration. For example, as shown in fig. 5, taking two radiation sources as an example, the two radiation sources have an included angle D in the latitudinal direction, the included angle D may be 1 ° -10 °, i.e. 1 ° -D is less than or equal to 10 °, the preset included angle D may be any included angle within the range of 1 ° -10 °, and for example, the preset included angle range B may be 1 °, 2 °, 3, 5 °, 6 °, 8 °, 9 ° or 10 °.

The source carrier shown in fig. 5 is exemplified by a carrier in which the radiation sources include a plurality of rows in the longitudinal direction, the radiation sources located in the same row have the same longitudinal direction, and the radiation sources located in the same row have the same latitudes, as well as a plurality of rows in the latitudinal direction. Further, for example, non-coplanar irradiation is realized, normal tissues are better protected, and the positions of the source carrier and the radioactive source are different in the latitude direction. I.e. each radiation source has a different latitude.

The application provides a carry source body is provided with a plurality of radiation source holes on carrying the source body, and radiation source fixed mounting is downthehole at the radiation source. Or the source carrier is provided with a source box position matched with the shape of the source box, the source box can be fixedly arranged at the source box position, and a plurality of radioactive sources are arranged on the source box. The source box can be a through hole or a blind hole, and a plurality of collimation holes are formed on the source carrier, so that the beam emitted by the radioactive source can pass through the collimation holes. The shape and structure of the source cartridge and the source cartridge position are not limited in the present application.

The source carrier is also provided with an active box connecting part for fixing a source box positioned at the source box position. Similarly, the source cartridge is also provided with a connecting part for connecting with the source cartridge. The source carrier and the source cartridge may be connected by a screw or by a snap, and the connection and the fixing manner of the source cartridge and the source cartridge are not limited in this application, but the above examples are merely illustrative.

The source carrying body is further provided with a connecting part for taking and replacing the source box. By way of example, the source cartridge connection may be a threaded bore that may be threadably coupled to the source guide. Alternatively, the source cartridge connecting portion and the source guiding rod may be in a magnet-attracting connection. The connection between the source cartridge and the guide rod, and the way of replacing the source cartridge are not limited in this application, and the above examples are merely illustrative.

The source carrier provided by the application has different materials between the source box and the source carrier. By way of example, the source cartridge may be formed of a tungsten alloy and the carrier may be formed of cast iron.

A specific example of the carrier provided in the present application is described below with reference to fig. 6.

In the collimation body provided by the application, in the longitudinal direction, the distance between two adjacent collimation holes is larger than the size of a radioactive source. Therefore, the radioactive source can be shielded by only enabling the collimating body and the radioactive source to be staggered by a small angle, the space between the collimating holes is used for shielding the radioactive source, and shielding by using a shielding position is avoided, and the rapid switching source can be realized because only the small angle is needed to be staggered.

By way of example, the collimating body provided herein includes, in the longitudinal direction, each collimating aperture group comprising a plurality of rows, the adjacent two rows having an included angle in the range of 2 ° to 15 °. In the collimating hole group, the included angles of any two adjacent rows are the same, or the included angles of different adjacent rows are different, which is not limited in this application, and fig. 6 is only an illustration. As shown in fig. 6, the plurality of radiation sources are divided into 4 rows, and the included angle of the adjacent row alignment holes is exemplified by B (two rows are exemplified in fig. 4), the included angle B may be 2 ° -15 °, that is, 2 ° -B is less than or equal to 15 °, the preset included angle B may be any included angle within the range of 2 ° -15 °, and the preset included angle B may be 2 °, 2.5 °, 3, 5 °, 6 °, 8 °, 10 °, 12 or 15 °.

The collimating body provided by the application has an included angle range of 20-60 degrees in the latitude direction of the collimating hole group. Illustratively, as shown in FIG. 6, the preset included angle range C may be 20-60, i.e., 20-60, and the preset included angle range C may be any included angle within the range of 20-60, and illustratively, the preset included angle range C may be 20, 25, 30, 38, 40, 45, 50, 53, or 60.

By way of example, the angle between any two adjacent collimation holes in the latitudinal direction of the collimation body provided by the application is 1-10 degrees. For example, the angles of any two adjacent collimation holes in the latitudinal direction are the same, or the angles of any two adjacent collimation holes in the latitudinal direction are different, which is not limited in this application, and fig. 6 is only an illustration. For example, as shown in fig. 6, taking two collimating holes as an example, the angle D between the two collimating holes in the latitudinal direction may be 1 ° -10 °, i.e. 1 ° -D is less than or equal to 10 °, the preset angle D may be any angle within the range of 1 ° -10 °, and for example, the preset angle D may be 1 °, 2 °, 3, 5 °, 6 °, 8 °, 9 ° or 10 °.

The collimator shown in fig. 6 is exemplified by a collimator in which the collimator holes of the collimator hole group include plural rows in the longitudinal direction, the same longitudinal direction as the radiation sources in the same row, and plural rows in the latitudinal direction as the radiation sources in the same row. Further, for example, non-coplanar irradiation is realized, normal tissues are better protected, and the carrier body provided by the application has different positions of the collimation holes in the latitude direction. I.e. each collimation hole has a different latitude.

The application provides a collimation body, the collimation body still includes shielding position for shielding the beam of a plurality of radiation sources. The source can be turned off by shielding the radiation source of the collimation body. The specific position of the shielding position on the shielding body is not limited, and in fig. 6, the shielding position is illustrated by taking the position of each collimating aperture group as an example.

For example, in the collimating body provided by the application, the shielding position is located between any two adjacent collimating hole groups in the plurality of collimating hole groups. For example, as shown in fig. 7, the shielding position is illustrated as being located between the collimating aperture group (2) and the collimating aperture group (3).

In fig. 7, only one shielding position is taken as an example, and the collimating body provided in the application includes a plurality of shielding positions. For example, shielding positions may also be provided between the (1) and (2) collimator hole sets. The shielding position can also be arranged between the collimating aperture group (3) and the collimating aperture group (4). Shielding positions can also be arranged between every two adjacent collimation hole groups. The number and distribution of the plurality of mask bits are not limited, and the above examples are merely illustrative.

The collimating body that this application provided, the collimating body includes fixed connection's interior collimating body and outer collimating body, and the collimating hole on the interior collimating body corresponds the setting with the collimating hole on the outer collimating body. I.e. the alignment body may comprise a double layer, the inner alignment body and the outer alignment body may be fixed by means of a screw connection.

The collimating body comprises an inner collimating body and an outer collimating body, and the inner collimating body and the outer collimating body can rotate relatively. For example, during treatment, if an accident occurs, the source can be turned off rapidly by the inner collimator, the outer collimator is rotated to align the shielding position with the radiation source to shield the radiation source, and the shielding position of the inner collimator is further aligned with the radiation source to achieve complete source turn off.

The collimating body that this application provided, the collimation hole on the interior collimating body is the straight hole, and/or, the collimation hole on the outer collimating body is the taper hole. 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.

The utility model provides a collimation body is provided with the shield body in shielding position, and the material density of shield body is greater than the material density of collimation body. The shielding body is fixedly connected with the collimating body, and the shielding body can 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 shield can achieve 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, the source device further comprises a switch body, and the switch body is positioned between the carrier body and the collimation body; at least two groups of hole sites corresponding to the radioactive source are arranged on the switch body, one group of hole sites are through holes, and the other groups of hole sites comprise through holes and shielding sites. For example, as shown in fig. 13, 5 groups of holes, namely, a-e groups of holes are arranged on the switch body, wherein the a holes are through holes, only one row of holes is used as shielding positions, two rows of holes are used as shielding positions, three rows of holes are used as shielding positions, four rows of holes are used as shielding positions, and the other holes are used as shielding positions. The shielding position may be a hole not provided in the switch body, or may be a hole provided in the switch body but filled with a tungsten rod to shield the radiation source.

The utility model provides a radiotherapy system is provided with different hole sites on the switch body, and the trompil number of different hole sites is different, then can be through making the different hole sites of switch body correspond the radiation source to the partial radiation source of selective shielding, with the dose of adjusting focus department.

The radiotherapy system provided by the application can realize 360-degree circumferential rotation or reciprocating rotation of the central shaft of the source device by the carrier body and the collimator body. The carrier and the collimator may reciprocate within 270 degrees. The reciprocating rotation angle is not limited, and the present application will be exemplified by the above examples.

The radiation therapy system provided by the application can move the carrier source body and/or the collimation body along a preset track. For example, as shown in fig. 11, the source carrier and/or the collimator may be movable in the direction of the central axis of the source arrangement. Alternatively, as shown in fig. 12, the source carrier and/or the collimator may be moved in direction a. Specifically, the carrier body can move along the direction of the central axis of the source device, and the collimation body is fixed; or the collimation body moves along the direction of the central axis of the source device, and the carrier source body is fixed; alternatively, both the source carrier and the collimator may be movable in the direction of the central axis of the source device. The source carrying body and/or the collimation body move along a preset track and can be an implementation switch source.

The radiation therapy system provided herein, the source carrier and/or the collimator is composed of a plurality of segments. 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 herein may also be in the form of a sheet, i.e., one of the plurality of segments. The specific shape of the carrier is not limited in this application.

During treatment, the patient's tumor needs to be precisely located at a common focal point so that the radiation kills the tumor cells. However, if the patient moves during the treatment, the radiation is deviated, which is not only unfavorable for the treatment but also harmful to the health of the patient, and because the common focus of the existing radiotherapy equipment is positioned in the cavity of the source device, whether the head of the patient moves during the treatment cannot be monitored. The radiation therapy system provided by the application has the advantages that the common focus is positioned outside the end face of the source device and is positioned in the imaging area of the imaging device, so that the imaging device can be used for imaging a patient to accurately confirm the movement condition of the patient, and the treatment couch is driven to re-align the tumor of the patient with the common focus.

The radiotherapy system of the present application, the imaging device is any one of an X-ray imaging device, a CT imaging device, an ultrasound imaging device, a DSA imaging device, an MR imaging device, a PET imaging device, or any combination thereof. For example, the imaging device is an X-ray imaging device, which may include an X-ray tube and a flat panel detector, as illustrated in fig. 8, 11, and 12. Or may comprise two X-ray tubes and two flat panel detectors, the beams from the two X-ray tubes intersecting. Of course, the imaging device may also be a combination of any two or more different imaging devices, for example the imaging device may be a combination of an X-ray imaging device and a DSA imaging device. The specific arrangement of the imaging device is not limited, and the above examples are merely illustrative.

For example, in case the imaging device comprises an imaging center point, the common focus coincides with the imaging center point. For example, the imaging device includes two X-ray tubes and two X-ray plates corresponding to receive the beams emitted by each X-ray tube, the beams emitted by the two X-ray tubes intersecting at a common focal point.

The radiation therapy system provided herein, the imaging device is rotatable along a source device central axis. As shown in fig. 8, 11 and 12, if the imaging apparatus includes one X-ray tube and one X-ray flat panel, if the patient moves in the up-down direction shown in fig. 8, 11 and 12, it cannot be judged from the image. Thus, if the imaging device is rotated about the central axis of the source device, it can acquire images of the patient at different angles, so that it can be confirmed at each angle whether the patient is moving.

The rotation of the image forming apparatus may be performed by attaching a rotation device to the image forming apparatus, for example, by a gear ring, or by a slip ring drive. The driving method of the imaging device is not limited in this application.

The application provides a radiation therapy system, imaging device fixed connection is on the source device. The imaging device is illustratively fixedly coupled to either the source carrier or the collimator. Taking the example shown in fig. 8 as an example, the ray tube and the X-ray flat plate may be fixedly connected with the carrier, so that the carrier rotates to drive the imaging device to rotate, thereby avoiding separately setting a rotation driving device for imaging. Of course, the cheng xi mulberry device can be fixedly connected to the switch body or the collimation body, which is not limited in the application.

The utility model provides a radiation therapy system, radiotherapy equipment still include shielding device, and shielding device is located one side of source device, and the beam that the radiation source sent is shielded by shielding device after passing public focus. As illustrated in fig. 8, 11 and 12, the shielding device is located on one side of the common focal point of the source device, and the radiation beam emitted by the radiation source passes through the common focal point and is shielded by the shielding device to avoid excessive radiation in the treatment room. By way of example, the shielding is a ring, and radiation from a radiation source rotating one revolution about the central axis is received by the shielding. Alternatively, the shielding device is a shielding block that is rotatable along a central axis of the source device to receive radiation after passing through the common focal spot following rotation of the radiation source. It should be noted that, when the treatment couch carries the patient to move, the shielding device is provided with a channel to facilitate the movement of the treatment couch.

For example, the position setting of the shielding device and the imaging device is not limited, and for example, the imaging device may be separately fixed or may be disposed inside the shielding device.

The radiation therapy system provided herein further includes a shielding door that can open or close a cavity of the radiation therapy system. In the example shown in fig. 8, the shielding door 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. Of course, the shielding door may be provided between the image forming apparatus and the shielding apparatus, or the shielding door may be provided outside the shielding door. The specific installation position of the shielding door is not limited in the present application, and only the example shown in fig. 8 is used for illustration.

The radiation therapy system provided herein, as shown in fig. 8, further provides an anti-sinking assembly 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 foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended that all modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention.

Claims

1. The collimating body is characterized by comprising an inner collimating body and an outer collimating body, wherein the collimating holes on the inner collimating body are straight holes, and the collimating holes on the outer collimating body are conical holes;

the collimating body comprises a plurality of collimating hole groups, wherein the included angle of each collimating hole group in the longitudinal direction is 5-60 degrees, and the included angle of each collimating hole group in the latitudinal direction is 20-60 degrees;

each collimation hole group comprises a plurality of collimation holes, the distance between two adjacent collimation holes is larger than the size of the radioactive source in the longitudinal direction, and beams emitted by the radioactive sources pass through the collimation holes of the collimation hole groups and then intersect at a common focus.

2. A collimator according to claim 1, wherein the angle between two adjacent collimator holes is 2 ° -15 °.

3. A collimator body as claimed in claim 1, wherein any two adjacent sources have an included angle in the latitudinal direction in the range 1 ° to 10 °.

4. A source device, characterized in that the source device comprises a source carrier and a collimator body, a plurality of radioactive sources are arranged on the source carrier, the collimator body is the collimator body according to any one of claims 1-3, and beams emitted by the radioactive sources intersect at a common focus after passing through all the collimating holes of the collimating hole group;

the included angle range of the plurality of radioactive sources in the longitude direction is 5-60 degrees, and the included angle range of the plurality of radioactive sources in the latitude direction is 20-60 degrees;

the collimating body is provided with a plurality of collimating hole groups, the included angle of each collimating hole group in the longitudinal direction ranges from 5 degrees to 60 degrees, and the included angle of each collimating hole group in the latitudinal direction ranges from 20 degrees to 60 degrees; the collimating body comprises an inner collimating body and an outer collimating body, the collimating holes on the inner collimating body are straight holes, and the collimating holes on the outer collimating body are conical holes; in the longitudinal direction, the distance between two adjacent collimation holes is larger than the size of the radioactive source;

the source carrying body and the collimation body can rotate or reciprocate with 360 degrees of the central shaft of the diffraction source device, and when the source carrying body rotates to pass through sensitive tissues or organs, all radiation sources with included angles ranging from 5 degrees to 60 degrees in the longitudinal direction are turned off.

5. A source device according to claim 4, wherein the carrier body and/or the collimator body is movable in the direction of the central axis of the source device.

6. The source device of claim 4, further comprising a source cartridge having a plurality of radiation sources fixedly disposed thereon;

7. A radiation therapy system comprising a source device as claimed in any one of claims 4 to 6, and an imaging device, wherein a common focal point of the source device is located outside an end face of the source device, and the imaging device is disposed on one side of the source device in a direction of a rotation axis of the source device, and the common focal point is located in an imaging region of the imaging device;

the radiation therapy system further includes a shielding device positioned on one side of the source device, the radiation source beam passing through the common focal point and being shielded by the shielding device.

8. The radiation therapy system of claim 7, wherein said imaging device is any one of an X-ray imaging device, a CT imaging device, an ultrasound imaging device, a DSA imaging device, an MR imaging device, a PET imaging device, or any combination thereof.

9. The radiation therapy system of claim 8, wherein said imaging device comprises two X-ray tubes and two X-ray plates for receiving beams from each X-ray tube, said beams from said two X-ray tubes intersecting at a common focal point; alternatively, the imaging device comprises an X-ray tube and an X-ray plate corresponding to the beam emitted by the X-ray tube.

10. The radiation therapy system of claim 7, wherein said imaging device is rotatable along said source device central axis.

11. The radiation therapy system of claim 7, wherein said carrier and said collimator are reciprocally rotatable about a source device central axis or 360 ° circumferentially rotatable.