CN113230547B - Radiotherapy system - Google Patents

Abstract

The application discloses radiation therapy system belongs to medical technical field. A radiotherapy system comprises a radiation source device and an imaging device, wherein the radiation source device comprises a source carrying body and a collimating body; a plurality of radioactive sources are arranged on the source carrier, and included angles of the plurality of radioactive sources in the longitude direction are within a preset included angle range; the collimating body is provided with a plurality of collimating hole groups, and the included angle of each collimating hole group in the longitude direction is within the range of the preset included angle; 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 group 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 direction of the rotating shaft of the source device, and the common focus is located in the imaging area of the imaging device.

Description

Radiotherapy system

The application is a divisional application of Chinese application with the application number of 201810971119.1, the application date of which is 24.8.8.2018, and the name of the invention is 'a radiotherapy system'.

Technical Field

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

Background

With the development of medical technology, radiotherapy is more and more widely applied to the treatment of tumors.

The existing radiotherapy system for treating the head mainly comprises a head gamma knife, wherein a natural isotope radioactive source cobalt-60 is used for emitting gamma rays, and the radioactivity of the rays is used for killing tumor cells. However, since the radiation can also damage normal tissues or cells, the existing head gamma knife comprises 30 or 180 radioactive sources, the radioactive sources respectively emit beams from different directions and focus on a common focus, the radiation dose rate at the common focus is the maximum, and the beam emitted by each radioactive source has less damage to the normal tissues or cells, so that the aim of killing tumor cells and protecting the normal tissues or cells is fulfilled, and the tumor treatment effect is realized.

However, the gamma knife for head has a small treatment space, and can only accommodate the head, and an imaging device cannot be installed in the treatment space, so that whether the patient moves in the existing treatment monitoring 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, and the error of body surface monitoring is large, so that the high-accuracy requirement of clinic is difficult to meet.

Disclosure of Invention

The application provides a radiation therapy system which can monitor the movement condition of a patient by acquiring an image of the patient in the treatment process and can protect sensitive tissues and organs in the treatment process. The technical scheme is as follows:

in one aspect, a radiation therapy system is provided, comprising a source arrangement and an imaging arrangement, the source arrangement comprising a source carrier and a collimator body; the radioactive source carrier is provided with a plurality of radioactive sources, the included angle range of the radioactive sources in the longitudinal direction is 5-60 degrees, and the included angle range of the radioactive sources in the latitudinal direction is 20-60 degrees;

the collimating body is provided with a plurality of collimating hole groups, and the included angle of each collimating hole group in the longitude direction is 5-60 degrees, and the included angle in the latitude direction is 20-60 degrees;

each collimation hole group comprises a plurality of collimation holes, and beams emitted by the radioactive sources pass through the collimation holes of the collimation hole groups and then intersect at a common focus;

the common focal point is located within an imaging region of the imaging device.

Illustratively, 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 taper holes.

Illustratively, each of the collimation hole groups comprises a plurality of collimation holes, and beams emitted by the plurality of radiation sources pass through the collimation holes of the collimation hole groups and then intersect at a common focus.

For example, the source carrier and the collimating body can rotate around the central axis of the source device by 360 degrees or rotate back and forth, and the source device can close all radioactive sources in the included angle range when rotating to pass through sensitive tissues or organs.

Illustratively, the common focus is located outside an end face of the source device, and the imaging device is disposed on a side of the source device in a direction of a rotation axis of the source device.

Illustratively, 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, where the imaging device includes an imaging center point, the common point coincides with the imaging center point.

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

Illustratively, the imaging device is fixedly attached to the source device.

Illustratively, the radiation therapy system further comprises a shielding device, wherein the beam emitted by the radiation source passes through the common focus and is shielded by the shielding device.

Illustratively, the radiation therapy system further comprises a shield door that can open or close a cavity of the radiation therapy system.

Illustratively, in the longitudinal direction, the spacing between two adjacent collimating holes is larger than the size of the radiation source.

By way of example, the carrier and/or the collimator body can be movable in the direction of a central axis of the source arrangement.

Illustratively, the radiation source device further comprises a source box, wherein a plurality of radiation sources are fixedly arranged on the source box;

and a source box position is arranged in a preset included angle range of the source carrier in the longitude direction, and the source box position is matched with the source box in shape.

The beneficial effect that technical scheme that this application provided brought is:

the application provides a radiation therapy system, on the one hand, the public focus is located outside the terminal surface of source device, imaging device sets up the one side at source device along the rotation axis direction of source device, and the public focus is located imaging device's formation of image area, can image the patient's tumour that is located imaging area through imaging device promptly, whether shift takes place according to the accurate affirmation patient of image to and the concrete direction and the distance of removal, so that through removing the treatment bed and come the reposition and make the patient's tumour be located public focus department.

In another aspect, the source device includes a source carrier and a collimator; a plurality of radioactive sources are arranged on the source carrier, and included angles of the plurality of radioactive sources in the longitude direction are within a preset included angle range; the collimating body is provided with a plurality of collimating hole groups, and the included angle of each collimating hole group in the longitude direction is within the range of the preset included angle; 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 group and then intersect at a common focus. Because the plurality of radioactive sources are distributed in the preset included angle range in the longitudinal direction, the radioactive sources can be driven to rotate along the central shaft of the radiotherapy equipment through the source carrier, so that the radioactive sources can be turned off when passing through sensitive tissues or organs; when the radioactive source passes through normal tissues and organs, the radioactive source is powered on, so that sensitive tissues and organs such as eyes can be protected in the treatment process of head tumor, and additional injury is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional radiotherapy apparatus provided in an embodiment of the present application;

fig. 2 is a schematic view of a conventional radiation source device provided in an embodiment of the present application;

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

FIG. 4 is a schematic top view of a prior art 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 disclosure;

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

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

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

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

FIG. 10 is a schematic view of another collimating body provided by embodiments of the present application;

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

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

fig. 13 is a schematic diagram of another switch provided in the embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The radiation therapy principle of the head tumor of the existing radiation therapy equipment which can be used for the head tumor is shown in figures 1 and 2, a plurality of radioactive sources are installed on a carrier, beams emitted by the radioactive sources pass through collimating holes on a collimating body and then intersect at a common focus, and the common focus is positioned in a cavity of a radiation source device of the radiation therapy equipment. The treatment couch is used for carrying the patient and moving the patient to the inside of the treatment cabin of the radiation source device, so that the focus of the patient is positioned at the intersection point for radiotherapy.

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

On the one hand, in the treatment process, the treatment space of the radiation source device is small, only the head can be accommodated, and the imaging device cannot be installed in the treatment space, so that whether the patient moves in the existing monitoring treatment process is monitored by arranging the reflection 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, and the error of body surface monitoring is large, so that the high-accuracy requirement of clinic is difficult to meet.

On the other hand, the source carrier and the collimating bodies can be driven to rotate mutually during treatment to switch collimating holes with different sizes and shield the radioactive source through the collimating bodies to realize switching sources, but the size switching of the six groups of collimating holes and the simultaneous switching of the switching sources cannot control one group independently. Thus, during treatment, the eye (sensitive tissue organs) is avoided only by adjusting the gamma angle so that the radiation avoids the eye.

The application provides a radiotherapy system, which comprises a radiation source device and an imaging device, wherein the radiation source device comprises a source carrier and a collimating body; a plurality of radioactive sources are arranged on the source carrier, and included angles of the plurality of radioactive sources in the longitude direction are within a preset included angle range; a plurality of collimating hole groups are arranged on the collimating body, and the included angle of each collimating hole group in the longitude direction is within the range of a preset included angle; 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 group and then intersect at a common focus.

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

The radiation therapy system provided by the present application, on one hand, as shown in fig. 8, fig. 11 and fig. 12, the common focus is located outside the end face of the radiation source device, the imaging device is disposed at one side of the radiation source device along the rotation axis direction of the radiation source device, and the common focus is located in the imaging area of the imaging device, i.e. the patient tumor located in the imaging area can be imaged by the imaging device, and whether the patient has displaced or not, and the specific direction and distance of the displacement are accurately confirmed according to the image, so that the patient tumor is located at the common focus by moving the treatment couch for repositioning.

In addition, the radiation source device comprises a carrier source body and a collimation body; a plurality of radioactive sources are arranged on the source carrier, and included angles of the plurality of radioactive sources in the longitude direction are within a preset included angle range; the collimating body is provided with a plurality of collimating hole groups, and the included angle of each collimating hole group in the longitude direction is within the range of the preset included angle; 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 group 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 radioactive sources can be driven by the source carrier to rotate along the central shaft of the radiotherapy equipment, so that the radioactive sources can be turned off when passing through sensitive tissues or organs; when the radioactive source passes through normal tissues and organs, the radioactive source is powered on, so that sensitive tissues and organs such as eyes can be protected in the treatment process of head tumor, and additional injury is avoided.

The source device and the imaging device will be described in detail below.

In the present application, the source device may be in the shape of a bowl or a cylinder, as shown in fig. 8, and the source carrier may be in the shape of a bowl as shown in fig. 5, and the collimator may be in the shape of a bowl as shown in fig. 6, and the longitudinal directions of the source carrier and the collimator are directions of 0 ° to 360 ° longitude as shown by arrows in the figure. Alternatively, the source device may be cylindrical, as shown in fig. 11, the source carrier may be as shown in fig. 9, the collimator may be as shown in fig. 10, and the source carrier and the collimator are cylindrical, and have longitudinal directions of 0 ° to 360 ° as indicated by arrows. The size of the two ends of the circular platform in fig. 11 is the same, but the size can be different, and an example is shown in fig. 12. The present application is not limited to the specific shape of the source device, and only the above is taken as an example.

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

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

For example, as shown in fig. 5, in order to provide a bowl-shaped collimating body according to the present application, fig. 5 illustrates that 4 collimating hole groups are provided on the collimating body, which are respectively the collimating hole group No. (1), (2), (3), and (4), and each collimating hole group includes 24 collimating holes and corresponds to the distribution of the radiation source. Taking the collimation hole group (1) as an example, beams emitted by a plurality of radioactive sources pass through each collimation hole of the collimation hole group (1) and then intersect at a common focus. Wherein, the included angle of the (1) collimating hole group, (2) collimating hole group, (3) collimating hole group, and (4) collimating hole group in the longitude direction is within the preset included angle range, fig. 5 takes the (1) collimating hole group as an example, the included angle of the (1) collimating hole group in the longitude direction (arrow direction shown in fig. 5) is a, and as an example, the preset included angle range a is 5 to 60 degrees with the preset included angle of the radioactive source of the carrier.

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

As shown in fig. 11, the source device may be cylindrical, and as shown in fig. 9, the carrier may be cylindrical as shown in fig. 9, with the longitudinal direction thereof being indicated by the arrow in fig. 9. In FIG. 9, the sizes of both ends of the cylindrical carrier are the same. The specific number and arrangement of the radioactive sources are not limited in the present application, and fig. 9 is only illustrated by including 20 radioactive sources as an example. The collimating body may also be a cylinder as shown in fig. 10, and the number and arrangement of the plurality of collimating holes correspond to the number and arrangement of the radioactive sources, which are not described herein. The number of the collimation hole groups on the collimation body is not limited in the present application, and fig. 10 illustrates an example in which two collimation hole groups are provided on the collimation body, and each collimation hole group includes 20 collimation holes.

Of course, the source device may be a tube as shown in fig. 12, and the size of the two ends of the tube-shaped source carrier in fig. 12 is different.

On one hand, in the radiation therapy system provided by the application, a plurality of radioactive sources are arranged on the radiation therapy equipment, a plurality of collimation hole groups are arranged on the collimation body, and included angles of the radioactive sources in the longitude direction are within a preset included angle range; the radioactive sources on the source carrier are distributed in a preset included angle range in the longitudinal direction, so that the radiotherapy equipment can drive the radioactive sources to rotate along the central shaft of the radiotherapy equipment through the source carrier, and the radioactive sources are turned off when passing through sensitive tissues or organs; when the radioactive source passes through normal tissues and organs, the radioactive source is powered on, so that sensitive tissues and organs such as eyes can be protected in the treatment process of head tumor, and additional injury is avoided.

The carrier source provided in the present application is specifically illustrated in fig. 5.

In the exemplary source carrier provided by the present application, in the longitudinal direction, the plurality of radioactive sources are divided into a plurality of groups, and the included angle between two adjacent groups of radioactive sources ranges from 2 ° to 15 °. In an example, in the multiple groups of radiation sources, included angles of any two adjacent groups of radiation sources are the same, or included angles of different two adjacent groups of radiation sources are different, which is not limited in the present application, and fig. 5 is only an example. As shown in FIG. 5, the plurality of radiation sources are divided into 5 groups, the included angle between two adjacent groups of radiation sources is B (the two groups are schematically shown in FIG. 5 as an example), the included angle B may be 2-15 °, i.e., 2 ° < B > 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 °, for example.

The included angle of the radioactive sources in the latitude direction of the carrier body is 20-60 degrees. For example, as shown in fig. 5, the source carrier is provided with a plurality of radioactive sources within a preset range C in the longitudinal direction. Illustratively, the preset angle range C can be 20-60 degrees, i.e., 20 ≦ C ≦ 60 degrees, and the preset angle range C can be any angle within the range of 20-60 degrees, e.g., the preset angle range C can be 20, 25, 30, 38, 40, 45, 50, 53, or 60 degrees.

By way of example, the source carrier provided by the application has an included angle of any two adjacent radioactive sources in the latitudinal direction ranging from 1 to 10 degrees. In an example, in the multiple groups of radioactive sources, the included angles of any two adjacent groups of radioactive sources in the latitudinal direction are the same, or the included angles of any two adjacent groups of radioactive sources in the latitudinal direction are different, which is not limited in this application, and fig. 5 is only an example. For example, as shown in FIG. 5, in the case of two of the radiation sources, the included angle D between the two radiation sources in the latitudinal direction may be 1-10 degrees, i.e., 1-10 degrees, and the predetermined included angle D may be any included angle within the range of 1-10 degrees, and the predetermined included angle B may be 1 degree, 2 degrees, 3 degrees, 5 degrees, 6 degrees, 8 degrees, 9 degrees, or 10 degrees, for example.

In the source carrier shown in fig. 5, the radioactive sources include a plurality of longitudinal rows, the radioactive sources in the same longitudinal row have the same longitude, and the radioactive sources in the same latitudinal row are divided into a plurality of latitudes, for example, the radioactive sources in the same row have the same latitude. Furthermore, for example, non-coplanar irradiation is realized, and normal tissues are better protected, the positions of radioactive sources of the carrier provided by the application are different in the latitude direction. I.e., each radioactive source has a different latitude.

The application provides a carrier, the carrier is provided with a plurality of radiation source holes on, and the 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 the source box is provided with a plurality of radioactive sources. The source box can be a through hole or a blind hole, and a plurality of collimation holes are arranged on the source carrier, so that the beam emitted by the radioactive source can be emitted through the collimation holes. The shape and structure of the source cassette and the source cassette site are not limited in this application.

The source carrier is also provided with a source box connecting part for fixing the source box positioned at the source box position. Similarly, the source box is also provided with a connecting part used for being connected with the source box position. For example, the source carrier and the source cassette may be connected by a screw or a snap, and the connection and fixing manner of the source cassette and the source cassette position is not limited in the present application, and is only exemplified by the above examples.

The source carrier provided by the application is characterized in that the source box is also provided with a connecting part for taking and replacing the source box. The source cartridge connecting part may be a screw hole, which may be connected by screw with the source guiding rod, for example. Alternatively, the source box connecting part and the source guiding rod can be in magnet adsorption connection. The connection between the source box and the source guide rod and the replacement of the source box are not limited in the present application, and the above description is only given as an example.

The source carrier provided by the application has the advantages that the source box is made of different materials from the source carrier. For example, the source capsule may be formed of a tungsten alloy and the source carrier may be formed of cast iron.

The carrier source provided in the present application is specifically illustrated below with reference to fig. 6.

The application provides a collimating body, in the longitude direction, the interval of two adjacent collimation holes is greater than the size of radiation source. Therefore, the radioactive sources can be shielded by the space between the collimating holes through only staggering the collimating bodies and the radioactive sources by a small angle, shielding positions are avoided from being used for shielding, and the sources can be quickly switched on and off because only staggering by a small angle is needed.

By way of example, the collimating body provided by the present application, in the longitudinal direction, each collimating hole group includes a plurality of rows, and the included angle between two adjacent rows of radioactive sources is in the range of 2 ° to 15 °. In an example, in the collimating hole group, included angles of any two adjacent rows are the same, or included angles of different two adjacent rows are different, which is not limited in this application, and fig. 6 is only an example. As shown in FIG. 6, the plurality of radiation sources are divided into 4 rows, the included angle of the collimation holes of the adjacent rows is B (the two rows are shown as an example in FIG. 4), the included angle B can be 2-15 degrees, namely, 2 degrees B is larger than or equal to 15 degrees, the preset included angle B can be any included angle within the range of 2-15 degrees, and the preset included angle B can be 2 degrees, 2.5 degrees, 3 degrees, 5 degrees, 6 degrees, 8 degrees, 10 degrees, 12 degrees or 15 degrees.

The included angle of the collimation body in the latitude direction of the collimation hole group is 20-60 degrees. Illustratively, as shown in FIG. 6, the predetermined angle range C may be 20-60, i.e., 20 ≦ C ≦ 60, and the predetermined angle range C may be any angle in the range of 20-60, and illustratively, the predetermined angle range C may be 20, 25, 30, 38, 40, 45, 50, 53, or 60.

By way of example, the collimating body provided by the application has an included angle ranging from 1 to 10 degrees between any two adjacent collimating holes in the latitudinal direction. For example, the included angle of any two adjacent collimating holes in the latitudinal direction is the same, or the included angle of any two adjacent collimating holes in the latitudinal direction is different, which is not limited in this application, and fig. 6 is only an example. Illustratively, as shown in FIG. 6, two of the collimating holes are taken as an example, the included angle D between the two collimating holes in the latitudinal direction is 1-10 °, i.e., 1 ° ≦ D ≦ 10 °, and the preset included angle D may be any included angle within the range of 1-10 °, and the preset included angle D may be 1 °, 2 °, 3, 5 °, 6 °, 8 °, 9 °, or 10 °, for example.

In the collimating body shown in fig. 6, the collimating holes of the collimating hole group include a plurality of rows in the longitudinal direction, the longitudinal direction of the radioactive sources in the same row is the same, and the collimating holes are also divided into a plurality of rows in the latitudinal direction, and the latitudes of the radioactive sources in the same row are the same. Furthermore, for example, non-coplanar irradiation is realized, and normal tissues are protected better, the positions of the collimation holes of the carrier provided by the application are different in the latitude direction. I.e. each collimating hole has a different latitude.

The application provides a collimating body, collimating body still includes shielding position for shielding the beam of a plurality of radiation sources. Namely, the source can be closed by the ray of the shielding radioactive source of the collimating body. The specific position of the shielding bit on the shielding body is not limited in the present application, and fig. 6 illustrates an example where the shielding bit is opposite to the position of each collimation hole set.

For example, the present application provides a collimating body, wherein 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 mask bit is located between the collimation hole group (2) and the collimation hole group (3).

In fig. 7, only one mask bit is included as an example, and the present application provides a collimating body including a plurality of mask bits. For example, a mask bit may also be provided between (1) and (2) collimation hole sets. A shielding bit may be provided between the collimating hole group (3) and the collimating hole group (4). Or a shielding bit can be arranged between every two adjacent collimation hole groups. The number and distribution of the plurality of mask bits are not limited in the present application, and the above example is merely used for illustration.

The application provides a collimation body, the collimation body includes the interior collimation body and the outer collimation body of fixed connection, and collimation hole on the interior collimation body corresponds the setting with the collimation hole on the outer collimation body. I.e. the collimating body may comprise a double layer, the inner collimating body and the outer collimating body may be fixed by a screw connection.

The application provides a collimating body, collimating body include interior collimating body and outer collimating body, but interior collimating body and outer collimating body relative rotation. In the treatment process, if an accident occurs, the inner collimating body can be used for realizing rapid source closing, the outer collimating body is rotated to enable the shielding position to be aligned with the radioactive source so as to shield the radioactive source, and the shielding position of the inner collimating body is further aligned with the radioactive source so as to realize complete source closing.

The application provides a collimation body, collimation hole on the interior collimation body is the straight hole, and/or, collimation hole on the outer collimation body is the taper hole. For example, the inner collimating body may be a straight hole, and the outer collimating body may also 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 can be both taper holes.

The application provides a collimation body is provided with the shielding body at the shielding position, and the material density of shielding body is greater than the material density of collimation body. For example, the shield is fixedly connected with the collimator, and the shield may be made of tungsten block or lead block or alloy thereof. The collimating body may be composed of cast iron. Thereby the shielding body can realize better shielding to the radioactive source.

Regarding the description of the source carrier and the collimator, only the above is taken as an example, and the arrangement manner of the source carrier and the collimator may also be used in the rotating shaft of the cylindrical source, which is not described herein again.

In the radiation therapy system provided by the application, the radiation source device further comprises a switch body, and the switch body is positioned between the carrier source body and the collimating body; at least two groups of hole sites corresponding to the radioactive sources are arranged on the switch body, wherein one group of hole sites are through holes, and the rest groups of hole sites comprise through holes and shielding sites. For example, as shown in fig. 13, 5 sets of hole sites, i.e., a-e sets of hole sites, are disposed on the switch body, wherein the hole sites a are all through holes, each of the other hole sites of the through holes is a shielding site in only one row of the hole sites b, each of the other hole sites of the through holes in two rows of the hole sites c is a shielding site, each of the other hole sites of the through holes in three rows of the hole sites d is a shielding site, and each of the other hole sites of the through holes in four rows of the hole sites e is a shielding site. It should be noted that the shielding position may be that no hole is provided on the switch body, or the switch body may be provided with a hole but the inside of the hole may be filled with a tungsten rod to shield the radioactive source.

The application 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 correspond the radiation source through the different hole sites that make the switch body to selective shielding part radiation source, with the dose of adjusting focus department.

According to the radiation therapy system, the source carrier and the collimating body can rotate around the central shaft of the source device by 360 degrees or rotate in a reciprocating manner. The source carrier and the collimating body rotate around the central axis of the source device in a reciprocating way, and the source carrier and the collimating body can rotate in a reciprocating way within the range of 270 degrees. The angle of the reciprocal rotation is not limited in the present application, and the above description is only given as an example.

According to the radiation therapy system, the source carrier and/or the collimating body can move along a preset track. By way of example, as shown in fig. 11, the carrier and/or the collimator body can be moved 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 movable in the direction a. Specifically, the source carrier can move along the direction of the central shaft of the source device, and the collimating body is fixed; or the collimating body moves along the direction of the central shaft of the radiation source device, and the source carrying body is fixed; alternatively, both the source carrier and the collimator body may be movable in the direction of the central axis of the source arrangement. The movement of the source carrier and/or the collimating body along the predetermined trajectory may be a switching source.

The present application provides a radiation therapy system in which the source carrier and/or collimator are composed of a plurality of segments. The radiation source may, for example, be located on one of the segments of the carrier or the segment may be movable in the direction of the central axis of the source arrangement. The collimating body may also be composed of a plurality of segments, and the collimating body may include a plurality of collimating hole sets, each collimating hole set being correspondingly disposed on one segment, or a plurality of collimating hole sets being disposed on one segment. Still alternatively, the collimating body may be provided with associated source bits, and one collimating hole group and one associated source bit may be provided on one segment.

In the radiation therapy system provided by the application, the carrier source body can also be in a sheet shape, namely 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 the common focus so that the radiation kills the tumor cells. However, if the patient moves during the treatment, the radiation is shifted, 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 located in the cavity of the radiation source device, whether the head of the patient moves or not can not be monitored during the treatment. The application provides a radiation therapy system, the common focus is positioned outside the end face of the radiation source device, and the common focus is positioned in the imaging area of the imaging device, so that the patient can be imaged by the imaging device, the movement condition of the patient can be accurately confirmed, and the treatment bed can be driven to align the tumor of the patient with the common focus.

In 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 shown in fig. 8, 11 and 12. Or may comprise two X-ray tubes, which emit beams that intersect, and two flat panel detectors. 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 present application is not limited to the specific arrangement of the imaging device, and only the above is taken as an example for explanation.

Illustratively, where the imaging device includes an imaging center point, the common focal point coincides with the imaging center point. For example, the imaging device comprises two X-ray tubes and two X-ray panels 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 present application provides a radiation therapy system wherein 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, it cannot be determined from the image if the patient moves in the up-down direction shown in fig. 8, 11 and 12. Thus, if the imaging device is rotated along 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 has moved.

The imaging device may be rotated by mounting the imaging device on the rotating device, for example, by a gear ring, or by a slip ring. The present application does not limit the driving method of the image forming apparatus.

The application provides a radiation therapy system, imaging device fixed connection is on the source device. Illustratively, the imaging device is fixedly coupled to either the source carrier or the collimating body. Taking the example shown in fig. 8 as an example, the radiation bulb and the X-ray flat panel may be fixedly connected to the source carrier, so that the source carrier rotates to drive the imaging device to rotate, thereby avoiding a separate rotation driving device for imaging. Of course, the chenxisang device may also be fixedly connected to the switch body or the collimating body, which is not limited in this application.

According to the radiotherapy system provided by the application, the radiotherapy equipment further comprises a shielding device, the shielding device is positioned at one side of the radiation source device, and the radiation beams emitted by the radiation sources pass through the common focus and are shielded by the shielding device. Illustratively, as shown in figures 8, 11 and 12, the shielding means is located on one side of the common focus of the radiation source arrangement, and the radiation emitted by the radiation source passes through the common focus and is shielded by the shielding means to avoid unwanted radiation within the treatment room. For example, the shielding device is a ring-shaped body, and rays of the radioactive source rotating around the central shaft are received by the shielding device. Alternatively, the shielding means is a shielding block which is rotatable about a central axis of the source arrangement to receive radiation after it has passed through the common focus 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 present application does not limit the position arrangement of the shielding device and the imaging device, and for example, the imaging device may be separately fixed, or may be arranged inside the shielding device.

The application provides a radiation therapy system, still include the shield door, shield door can open or closed radiation therapy system's cavity. Taking fig. 8 as an example, the shielding door may be disposed outside the cavity of the radiation source device, and may open or close the cavity of the radiation source device, and may be opened and closed up and down, or opened and closed left and right. So that during non-treatment times the beam can be shielded by the shield gate. Of course, the shield door may be disposed between the imaging device and the shielding device, or the shield door may be disposed outside the shield door. The specific installation position of the shield door is not limited in the present application, and the example shown in fig. 8 is merely used for illustration.

The radiation therapy system provided by the application is further provided with an anti-sinking assembly between the collimation body and the source carrier as shown in fig. 8. Furthermore, the radiation source device also comprises a shielding body positioned outside the carrier source body, and an anti-sinking assembly is also arranged between the shielding body and the carrier source body. For example, the anti-sinking component can be a bearing, so that the other end of the collimation body and the carrier source body is prevented from sagging under the condition that one end drives to rotate.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (14)

1. A radiation therapy system is characterized by comprising a radiation source device and an imaging device, wherein the radiation source device comprises a carrier source body and a collimation body; the source carrier is provided with a plurality of radioactive sources, the included angle of the radioactive sources in the longitudinal direction ranges from 5 degrees to 60 degrees, and the included angle of the radioactive sources in the latitudinal direction ranges from 20 degrees to 60 degrees;

the collimating body is provided with a plurality of collimating hole groups, and the included angle of each collimating hole group in the longitude direction is 5-60 degrees, and the included angle in the latitude direction is 20-60 degrees;

each collimation hole group comprises a plurality of collimation holes, and beams emitted by the plurality of radioactive sources pass through the collimation holes of the collimation hole group and then intersect at a common focus;

the common focal point is located within an imaging region of the imaging device;

wherein each of the radiation sources is located at a different latitudinal location.

2. The radiation therapy system of claim 1, wherein said collimating body comprises an inner collimating body and an outer collimating body, wherein said collimating holes of said inner collimating body are straight holes and said collimating holes of said outer collimating body are tapered holes.

3. The radiation therapy system of claim 1, wherein each of said plurality of collimation holes comprises a plurality of collimation holes, wherein beams emitted by said plurality of radiation sources pass through each collimation hole of said plurality of collimation holes and intersect at a common focal point.

4. The radiation therapy system of claim 1, wherein said source carrier and said collimating body are rotatable circumferentially about a central axis of the source device through 360 ° or reciprocally, said source device being configured to turn off all radiation sources within said angular range while rotating through sensitive tissue or organ.

5. The radiation therapy system of claim 1, wherein said common focus is located outside an end face of said source arrangement, said imaging arrangement being disposed on a side of said source arrangement in a direction of a rotational axis of said source arrangement.

6. The radiation therapy system of claim 1, 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.

7. The radiation therapy system of claim 1, wherein, where the imaging device includes an imaging center point, the common focal point coincides with the imaging center point.

8. The radiation therapy system of claim 1, wherein said imaging device is rotatable along said source device central axis.

9. The radiation therapy system of claim 8, wherein said imaging device is fixedly attached to said source device.

10. A radiation therapy system according to claim 1, further comprising shielding means, wherein the radiation emitted by said radiation source passes through a common focus and is shielded by said shielding means.

11. The radiation therapy system of claim 1, further comprising a shielded door that can open or close a cavity of the radiation therapy system.

12. The radiation therapy system of claim 1, wherein the spacing between two adjacent collimating apertures in the longitudinal direction is greater than the size of the radiation source.

13. A radiation therapy system according to claim 1, characterized in that said carrier body and/or said collimating body are movable in the direction of the central axis of the source arrangement.

14. The radiation therapy system of claim 1, wherein said radiation source assembly further comprises a source cartridge having a plurality of radiation sources fixedly disposed thereon;

and a source box position is arranged in a preset included angle range of the source carrier in the longitude direction, and the source box position is matched with the source box in shape.

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