Magnetic resonance imaging guided radiotherapy system and magnetic resonance imaging equipment

Abstract

The utility model discloses a magnetic resonance imaging guided radiotherapy system, and the system comprises a rotating rack which can rotate around a preset rotating shaft; the treatment head can rotate along with the rotation of the rotary rack and is used for emitting radiotherapy rays to a target object; the magnetic resonance imaging equipment comprises two magnet assemblies, the two magnet assemblies are oppositely arranged on the rack in the circumferential direction of the rotating rack and used for forming a magnetic field for imaging, and the magnetic field for imaging and the radiotherapy rays have an overlapping area and are used for conducting magnetic resonance imaging on the target object; wherein a preset included angle is formed between the central axis of the oppositely arranged magnet assemblies and the rotating shaft, and the closer to the central axis, the larger the distance between the inner surfaces of the oppositely arranged magnet assemblies is. The utility model further discloses magnetic resonance imaging equipment.

Description

Technical Field

[0001] The present application relates to the technical field of radiotherapy, and in particular to a radiotherapy system guided by magnetic resonance imaging and a magnetic resonance imaging device. Background Art

[0002] The advantage of Magnetic Resonance Imaging (MRI) over Computerized Tomography (CT) is that MRI images can clearly present the distribution of soft tissues, thereby more accurately determining the location of tumor lesions. Therefore, MRI is increasingly widely used in image guidance in radiotherapy, especially real-time image guidance in radiotherapy.

[0003] However, the radiation therapy / imaging space of the radiation therapy system combined with the MRI imaging device is very small, and thus, it may cause physical discomfort to the patient located in the radiation therapy / imaging space. Utility Model Content

[0004] The embodiments of the present application provide a magnetic resonance imaging-guided radiotherapy system and a magnetic resonance imaging device, which can increase the size of the radiotherapy / imaging space, thereby alleviating the patient's physical discomfort.

[0005] On the one hand, the present application provides a magnetic resonance imaging guided radiotherapy system, comprising: a rotating frame, which can rotate around a preset rotation axis; a treatment head, which can rotate with the rotation of the rotating frame, and is used to emit radiotherapy rays to a target object; a magnetic resonance imaging device, comprising two magnet assemblies, which are relatively arranged on the frame along the circumference of the rotating frame, and are used to form an imaging magnetic field, wherein the imaging magnetic field and the radiotherapy rays have an overlapping area, and are used to perform magnetic resonance imaging on the target object; wherein the central axes of the relatively arranged magnet assemblies are at a preset angle with the rotation axis, and the closer to the central axis, the greater the distance between the inner surfaces of the relatively arranged magnet assemblies.

[0006] In some embodiments of the present application, the treatment head is located between oppositely arranged magnet assemblies; or, at least one of the oppositely arranged magnet assemblies has a through hole in the direction of the central axis, and accordingly, the treatment head is located at the through hole, and the emitted radiotherapy rays irradiate the target object.

[0007] In some embodiments of the present application, the treatment head includes a first treatment head and a second treatment head, and the first treatment head and the second treatment head are respectively located on two sides between oppositely arranged magnet assemblies.

[0008] In some embodiments of the present application, the treatment head includes a first treatment head and a second treatment head, wherein the first treatment head is located between two oppositely disposed magnet assemblies, and the second treatment head is located at the through hole, and the emitted radiotherapy rays irradiate the target object.

[0009] In some embodiments of the present application, the treatment head located between the oppositely arranged magnet assemblies is a gamma ray treatment head, and the treatment head located at the through hole is a gamma ray treatment head or an X-ray treatment head.

[0010] In some embodiments of the present application, at least one of the relatively arranged magnet assemblies includes a plurality of magnets, and the plurality of magnets are arranged in sequence along the direction of the central axis.

[0011] In some embodiments of the present application, the plurality of magnets are arranged in a nested manner.

[0012] In some embodiments of the present application, at least one magnet among the plurality of magnets has a thickness different from that of the other magnets.

[0013] In some embodiments of the present application, a transition piece is provided between at least two magnets among the plurality of magnets, and the transition piece is made of non-magnetic material.

[0014] In some embodiments of the present application, the inner surface of at least one of the oppositely arranged magnet assemblies is curved or stepped.

[0015] In some embodiments of the present application, the radiotherapy system further includes a detector, which is disposed at a position opposite to the treatment head and is configured to receive the radiotherapy rays emitted by the treatment head and generate corresponding image data.

[0016] In some embodiments of the present application, the system further includes: a patient support device, which can be moved into or out of the overlapping area along the direction of the rotation axis, and the detector is connected to the patient support device and can move with the movement of the patient support device.

[0017] On the other hand, the present application also provides a magnetic resonance imaging device, comprising: a magnet assembly arranged oppositely, for forming a magnetic field for imaging; the magnet assembly arranged oppositely has a central axis, and the distance between the inner surfaces of the magnet assembly arranged oppositely is greater as it is closer to the central axis.

[0018] In the embodiment of the present application, the magnetic field formed by the magnet assemblies arranged oppositely in the magnetic resonance imaging device can be used to perform nuclear magnetic imaging on the target object to be treated, so as to guide the target object to perform nuclear magnetic imaging before or during radiotherapy based on the nuclear magnetic imaging. Since the distance between the inner surfaces of the magnet assemblies arranged oppositely is greater the closer to the central axis of the magnet assemblies arranged oppositely, the size of the imaging space and the treatment space of the radiotherapy system is increased, and the discomfort of the target object located in the imaging or treatment space is reduced or alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0021] Figure 2 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0023] Figure 4 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a top view of a first magnet assembly provided in an embodiment of the present application;

[0025] Figure 6 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0026] Figure 7 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0027] Figure 8 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0028] Fig. 9 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0029] Fig.10 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0030] Fig.11 is a schematic structural diagram of another magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application;

[0031] Fig.12 It is a schematic diagram of the structure of another magnetic resonance imaging device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0035] The embodiments of the present application provide a magnetic resonance imaging-guided radiotherapy system and a magnetic resonance imaging device, which are described in detail below.

[0036] See also Figure 1 , Figure 1 This is a schematic structural diagram of a magnetic resonance imaging guided radiotherapy system provided in an embodiment of the present application. The system 100 includes: a rotating gantry 101, a treatment head 102 and a magnetic resonance imaging device 103.

[0037] in:

[0038] The rotating gantry 101 can rotate around a preset rotation axis S. Here, the rotating gantry 101 can rotate clockwise around the preset rotation axis S or counterclockwise around the preset rotation axis S. Usually, the radiotherapy isocenter of the radiotherapy system is located on the preset rotation axis S, and the preset rotation axis S is parallel to the Y axis in the IEC (International Electrotechnical Commission) coordinate system of the radiotherapy system.

[0039] In some embodiments, the rotating frame 101 may be a ring frame, a C-arm frame, a drum frame, a gantry frame, or other types of frames, which are not specifically limited in the present application.

[0040] The treatment head 102 is used to emit radiotherapy rays to the target object, and can rotate with the rotation of the rotating frame 101 to perform radiotherapy on the target point or target area of ​​the target object. Here, the target object can be a patient or a phantom simulating a patient. The treatment head 102 can be directly set on the rotating frame 101, or it can be indirectly connected to the frame 101, such as being set on other devices connected to the rotating frame 101.

[0041] The treatment head 102 can be Figure 1 In some embodiments, the treatment head 102 may be multiple, such as two treatment heads, three treatment heads, four treatment heads, etc. The treatment head 102 may be a focusing treatment head that focuses multiple radiotherapy rays into a point (or target point), a conformal intensity modulated treatment head that adjusts the radiotherapy rays into different shapes (or target areas) according to the shape of the tumor, a pencil beam treatment head that limits a radiotherapy ray to a pencil beam, or a treatment head of other radiotherapy modes.

[0042] As for the radiation source used by the treatment head 102, it can be any radiation source, such as a particle accelerator such as an X-ray accelerator, a radioisotope source such as a cobalt 60 radiation source, etc. For example, the radiation generated by the radiation source can be gamma rays, X-rays, electron beams, proton beams, helium ions, carbon ions, other heavy ions or neutrons. For example, the treatment head 102 can be a gamma ray focusing treatment head, a gamma ray conformal intensity modulated treatment head, a gamma ray pencil beam treatment head, an X-ray conformal intensity modulated treatment head, an X-ray focusing treatment head, an X-ray pencil beam treatment head (i.e., an X-knife treatment head).

[0043] The magnetic resonance imaging device 103 may include two magnet assemblies, namely, a magnet assembly 1031 and a magnet assembly 1032. Each magnet assembly is relatively arranged on the rotating frame 101 along the circumference of the rotating frame 101, and is used to form a uniform imaging magnetic field. The imaging magnetic field has an overlapping area with the radiotherapy rays, and is used to perform magnetic resonance imaging on the target object to generate a magnetic resonance image. Among them, the central axis P (such as Figure 1 The dotted line P) shown in the figure can form a preset angle with the rotation axis S, for example, 90 degrees, and the distance between the inner surfaces of the magnet assemblies relatively arranged closer to the center axis P is larger, and correspondingly, the distance between the inner surfaces of the magnet assemblies relatively arranged farther from the center axis P is smaller.

[0044] It should be noted that the inner surface of the magnet assembly is the side of the magnet assembly that is closer to the rotation axis S. The shape of the inner surface between the relatively arranged magnet assemblies is not limited, as long as the distance between the inner surfaces of the relatively arranged magnet assemblies that are closer to the central axis P is larger, and the distance between the inner surfaces of the relatively arranged magnet assemblies that are farther away from the central axis P is smaller. For example, the inner surface of at least one of the relatively arranged magnet assemblies is curved, stepped or in other shapes. The other side that is farther from the rotation axis S can be called the outer surface of the magnet assembly. The shape of the outer surface of the magnet assembly may be inconsistent with the inner surface. Here, the shape, curvature, size, etc. of the outer surface of the magnet assembly are not limited.

[0045] For example, Figure 2 As shown, the inner surface S1 of the magnet assembly 1031 and / or the magnet assembly 1032 in the relatively arranged magnet assembly 103 can be a smooth curved surface and the outer surface S2 is a horizontal plane; the inner surface S1 of the other magnet assembly 1032 arranged opposite to the magnet assembly 1031 can be a smooth curved surface and the outer surface S2 is a horizontal plane. Of course, the outer surface S2 of the magnet assembly 1032 can also be a smooth curved surface.

[0046] It should also be noted that relatively arranged magnet assemblies such as magnet assembly 1031 and magnet assembly 1032 may be symmetrical along the center axis P. Usually, the shape of each magnet assembly is regular, and the center axis P is also the center axis of each magnet assembly.

[0047] Here, the magnetic field strength generated by the relatively arranged magnet assemblies can be between 0.2T (Tesla) and 3T, such as 0.35T and 1.0T. The magnets in the relatively arranged magnet assemblies can be permanent magnets, electromagnets or superconducting magnets, etc., wherein, if the relatively arranged magnet assemblies are permanent magnets, they can usually have a magnetic field strength of 0.2T to 1.0T, and if they are superconducting magnets, they can usually have a magnetic field strength of 1.5T to 3.0T, such as 1.5T and 3.0T.

[0048] In the embodiment of the present application, when the MRI-guided radiotherapy system is used to perform MRI-guided radiotherapy, the magnetic field formed by the relatively arranged magnet assemblies in the MRI device can be used to perform nuclear magnetic imaging on the target object to be treated, and the target object can be guided to the position to be treated based on the magnetic resonance image generated by the nuclear magnetic imaging, and then the target object can be radiotherapyed using the treatment head, or the position of the target object can be monitored in real time based on the magnetic resonance image generated by the nuclear magnetic imaging during the process of the treatment head performing radiotherapy on the target object. Since the distance between the inner surfaces of the relatively arranged magnet assemblies is larger as they are closer to the central axis of the relatively arranged magnet assemblies, the size of the imaging space and the treatment space of the radiotherapy system is increased, thereby reducing or alleviating the discomfort of the target object in the imaging or treatment space.

[0049] For the magnetic resonance imaging device 103 in the radiotherapy system 100, at least one of the magnet assemblies (such as the magnet assembly 1031 or the magnet assembly 1032) disposed relatively thereto may be as follows: Figure 1 or Figure 2 As shown in FIG. 1 , a whole magnet is shown. In some embodiments, at least one magnet assembly in the relatively arranged magnet assemblies may also include a plurality of magnets, and the plurality of magnets are arranged in sequence along the center axis P direction.

[0050] Furthermore, multiple magnets can be nested and arranged in sequence along the direction of the central axis P, and can be staggered with each other, and the position of the staggering is not limited. For example, the sides of multiple magnets along the direction of the central axis P are staggered, and / or the upper and lower surfaces of multiple magnets in a direction perpendicular to the central axis P are staggered. Of course, they can also be non-staggered and simply superimposed along the direction of the central axis P. For example, the sides of multiple magnets along the direction of the central axis P and the upper and lower surfaces of multiple magnets in a direction perpendicular to the central axis P are not staggered.

[0051] Here, the inner surfaces of the plurality of magnets constitute the inner surface of the corresponding magnet assembly, and the inner surface of the magnet assembly may be as follows: Figure 1 or Figure 2 The smooth curved surface shown may also be stepped or in other shapes. In addition, the thickness of each magnet in the plurality of magnets may be the same, and of course, at least one magnet in the plurality of magnets may have a different thickness from the other magnets. The ring widths of the annular magnets in the plurality of magnets may be the same or different.

[0052] It should be noted that the thickness of the magnet is the thickness of the magnet cross section viewed from the preset rotation axis S (or Y axis); the width of the annular magnet is the width of the upper surface (or lower surface) of the annular magnet viewed from the center axis P.

[0053] It should also be noted that, among the multiple oppositely arranged magnets in the oppositely arranged magnet assembly, the magnetic field strength of the magnetic field formed by each group of oppositely arranged magnets can be the same. Of course, the magnetic field strength of the magnetic field formed by at least one group of oppositely arranged magnets can also be different from the magnetic field strength of the magnetic field formed by other oppositely arranged magnets.

[0054] For example, Figure 3 and Figure 4 As shown, the magnet assembly relatively arranged in the magnetic resonance imaging device 103 includes a magnet assembly 1031 and a magnet assembly 1032. The magnet assembly 1031 includes magnets 1031a, 1031b and 1031c sequentially nested and arranged along the direction of the central axis P (i.e., the first direction F1), and the magnet assembly 1032 includes magnets 1032a, 1032b and 1032c sequentially nested and arranged along the direction of the central axis P (i.e., the second direction F2 opposite to the F1 direction).

[0055] Magnets 1032a, 1032b and 1032c are disposed opposite to magnets 1031a, 1031b and 1031c respectively to form a magnetic field for imaging. The magnetic field strengths formed by magnets 1031a and 1032a, magnets 1031b and 1032b, and magnets 1031c and 1032c are all the same.

[0056] The inner surface of the magnet assembly 1031 formed by the inner surfaces of the magnets 1031a, 1031b and 1031c and the inner surface of the magnet assembly 1032 formed by the inner surfaces of the magnets 1032a, 1032b and 1032c are both stepped. Figure 3 or Figure 4It can be seen that the distance La between the inner surfaces of the relatively arranged magnets 1031a and 1032a is greater than the distance Lb between the inner surfaces of the relatively arranged magnets 1031b and 1032b, and the distance Lb between the inner surfaces of the relatively arranged magnets 1031b and 1032b is greater than the distance Lc between the inner surfaces of the relatively arranged magnets 1031c and 1032c.

[0057] Taking the magnet assembly 1031 as an example, Figure 3 In the embodiment, the side of the magnet 1031a and the side of the magnet 1031b, and the side of the magnet 1031b and the side of the magnet 1031c are not staggered, but are only superimposed along the central axis P direction (i.e., the first direction F1). Figure 4 In the embodiment, the side surface of magnet 1031a is staggered with the side surface of magnet 1031b, for example, the inner side surface of magnet 1031b close to the central axis P is approximately located at one-half of the side surface of magnet 1031a. Similarly, the side surfaces of magnet 1031b and magnet 1031c are also staggered, for example, the inner side surface of magnet 1031c close to the central axis P is approximately located at one-fifth of the outer side surface of magnet 1031b away from the central axis P. In addition, Figure 3 In the embodiment, the thickness of magnet 1031a, magnet 1031b and magnet 1031c are the same, and in Figure 4 In the figure, the thicknesses of magnet 1031a, magnet 1031b and magnet 1031c are different, for example, magnet 1031b is the thickest and magnet 1031a is the thinnest.

[0058] exist Figure 3 and Figure 4 Based on Figure 5 As shown, magnets 1031a and 1031b in the magnet assembly 1031 are cylinders without through holes, and magnets 1031b and 1031c are annular cylinders. The diameters of the central through holes are Mb and Mc respectively, and Mc is greater than Mb. In this way, the magnet assembly 1031 composed of magnets 1031a, 1031b and 1031c has no through holes in the direction of the central axis P. If the diameter of the central through hole of magnet 1031a is regarded as 0, magnets 1031a, 1031b and 1031c are arranged in sequence from small to large in the first direction F1 of the central axis P, that is, in the direction toward the rotation axis S. Accordingly, the magnets 1032a, 1032b and 1032c in the magnet assembly 1032 are arranged in a second direction F2 opposite to the first direction F1 along the central axis P, that is, in a direction toward the rotation axis S, in the order of the central through holes from small to large. Figure 5 As shown, viewed from the Z-axis direction, the ring widths of the annular magnets 1031b and 1031c are the same, but may be different.

[0059] When multiple magnets are arranged in sequence along the central axis P, a transition piece may be provided between at least two of the multiple magnets, and the transition piece is made of non-magnetic material, such as porcelain, glass, enamel, and non-ferromagnetic material, which cannot be magnetized. In this way, a relatively uniform magnetic field is formed.

[0060] Here, the transition piece made of non-magnetic material may be an annular cylinder, and the width of the annular ring and the thickness of the cylinder are not specifically limited in this application.

[0061] For example, Figure 6 As shown, a transition piece 104a is provided between the magnet 1031a and the magnet 1031b, a transition piece 104b is provided between the magnet 1031b and the magnet 1031c, a transition piece 104c is provided between the magnet 1032a and the magnet 1032b, and a transition piece 104d is provided between the magnet 1032b and the magnet 1032c.

[0062] like Figures 1 to 4 , Figure 6 As shown, each group of magnet assemblies in the oppositely arranged magnet assemblies does not have a through hole in the direction of the central axis P. In some embodiments, at least one magnet assembly in the oppositely arranged magnet assemblies may have a through hole in the direction of the central axis P, so that other equipment such as a treatment head can be easily installed.

[0063] It should be noted that, regardless of whether at least one of the magnet assemblies has a through hole in the direction of the central axis P, the treatment head 102 can be located between the magnet assemblies that are arranged oppositely. Here, the treatment head 102 located between the magnet assemblies that are arranged oppositely can be a focusing treatment head, a conformal intensity modulated treatment head, a pencil beam treatment head, or a treatment head of other radiotherapy modes. The radiation source used by the treatment head can be any radiation source, and the radiation source can generate gamma rays, electrons, protons, helium ions, carbon ions, other heavy ions, neutrons, or other non-X-rays. If the treatment head is a gamma ray treatment head, the treatment head can further be a gamma ray focusing treatment head or a gamma ray conformal intensity modulated treatment head.

[0064] If at least one of the magnet assemblies arranged opposite to each other has a through hole in the direction of the central axis P, such as Figure 7 and Figure 8As shown, the magnets 1031a and 1032a, which are the farthest from each other in the magnet assembly 103, are provided with through holes, and the treatment head 102 can be located at the through hole of the magnet 1031a or the magnet 1032a, and the emitted radiotherapy rays are used to irradiate the target object. Here, the treatment head 102 located at the through hole can be a focusing treatment head, a conformal intensity modulated treatment head, a pencil beam treatment head, or a treatment head of other radiotherapy modes, and the radiation source used by the treatment head 102 can be any radiation source, such as gamma rays, X-rays, electrons, protons, helium ions, carbon ions, other heavy ions, or neutrons.

[0065] It should be noted that the treatment head 102 can be located at the through hole as follows: Figure 7 As shown, it is located above the through hole, such as Figure 8 The shown one passes through the through hole, and may also be located inside the through hole or at other positions.

[0066] In some embodiments, the radiotherapy system 100 may further include: a detector 105, such as Figure 1 , Figure 7 and Figure 8 As shown, a detector 105 may be provided at a position opposite to the treatment head 102, and the detector 105 is used to receive the radiotherapy rays emitted by the treatment head 102 and passing through the target object and generate corresponding image data. Figure 7 and Figure 8 As shown, when both the magnet assembly 1031 and the magnet assembly 1032 have through holes, that is, when both the magnet 1031a and the magnet 1032a have through holes, the treatment head 102 can be located at the through hole of the magnet 1031a in the magnet assembly 1031, and correspondingly, the detector 105 can be located at the through hole of the magnet 1032a in the magnet assembly 1032.

[0067] It should be noted that the detector 105 can be located at the through hole as follows: Figure 7 and Figure 8 The illustrated embodiment is located inside the through hole, and may also be located above the through hole, penetrate the through hole, or at other locations.

[0068] Furthermore, the detector 105 may also have a driving device (not shown in the figure), which can drive the detector 105 to move, for example Figure 8 As shown, the detector 105 is driven to move closer to or away from the treatment head 102 (i.e., move up and down, move along the Z-axis direction). Of course, the detector 105 can also be driven to move left and right (i.e., move along the X-axis direction) or forward and backward (move along the Y-axis direction).

[0069] In some embodiments, the radiotherapy system 100 may further include: a patient support device 106, which may support and position the target object. For example, the patient support device 106 may be a three-dimensional, four-dimensional, five-dimensional, or six-dimensional patient support device or a treatment chair, etc. The patient support device 106 is located in the imaging / radiotherapy space of the radiotherapy system, and may be moved into or out of the overlapping area along the direction of the rotation axis S, and of course, may also be moved in other directions.

[0070] Further, the detector 105 can be connected to the patient support device 106 and can move along with the movement of the patient support device 106. The detector 105 can be disposed below the patient support device 106. For example, the detector 105 can be disposed at a position such as Fig. 9 The lower surface of the bed board of the patient support device 106 shown may also be disposed inside the bed body of the patient support device 106 .

[0071] Here, the detector 105 may be an MV-level detector, such as an Electronic Portal Imaging Device (EPID). Of course, it may also be a KV-level detector. The detector 105 may be a flat-panel detector or an arc-shaped detector.

[0072] The treatment head 102 in the radiotherapy system 100 may be the above Figure 1 or Figure 2 or Figure 3 or Figure 4 or Figure 6 or Figure 7 In some embodiments, the treatment head 102 may be multiple, including a first treatment head and a second treatment head. Here, the first treatment head and the second treatment head may emit radiotherapy rays simultaneously, or emit radiotherapy rays separately.

[0073] It should be noted that if there are multiple treatment heads 102, the multiple treatment heads 102 may be treatment heads of the same radiotherapy mode or treatment heads of different radiotherapy modes. For example, the treatment head located between the oppositely arranged magnet assemblies may be a gamma ray treatment head, and the treatment head located at the through hole may be a gamma ray treatment head or an X-ray treatment head. The radiation source used by each treatment head 102 may be the same or different.

[0074] In some embodiments, a detector may be disposed at a position opposite to the first treatment head and / or a detector may be disposed at a position opposite to the second treatment head.

[0075] The following will illustrate the layout structure between multiple treatment heads and the magnetic resonance imaging device in the radiotherapy system through some specific examples.

[0076] In one example, if Fig. 9 As shown, the treatment head 102 includes a first treatment head 1021 and a second treatment head 1022 , and the first treatment head 1021 and the second treatment head 1022 are respectively located on two sides between the oppositely arranged magnet assemblies 1031 and 1032 .

[0077] Here, the first treatment head 1021 and the second treatment head 1022 may be treatment heads of different modes, and the radiation sources of the first treatment head 1021 and the second treatment head 1022 may be the same or different. Exemplarily, the first treatment head 1021 and the second treatment head 1022 located between the oppositely arranged magnet assemblies 103 may be gamma ray treatment heads, and specifically, the first treatment head 1021 is a gamma ray focusing treatment head, and the second treatment head 1022 is a gamma ray conformal intensity modulated treatment head.

[0078] In this example, the detector 105 can be set on the lower surface of the patient support device 106. When the rotating gantry 101 rotates and drives the first treatment head 1021 and / or the second treatment head 1022 to be opposite to the detector 105, the detector 105 can obtain the radiotherapy rays passing through the target object, and / or obtain the radiotherapy rays emitted by the first treatment head 1021 or the second treatment head 1022, and generate corresponding image data. The image data can reflect the radiation dose received by the target object during the radiotherapy process.

[0079] It should be noted that when the first treatment head 1021 and the second treatment head 1022 emit radiotherapy rays at the same time, the two surfaces of the detector 105 can simultaneously acquire the radiotherapy rays and generate image data.

[0080] In another example, Fig.10 As shown, the treatment head 102 includes a first treatment head 1021 and a second treatment head 1022. The first treatment head 1021 is located between two oppositely arranged magnet assemblies 1031 and magnet assemblies 1032, and the second treatment head 1022 is located at the through hole of the magnet assembly 1031. The radiotherapy rays emitted by the first treatment head 1021 and the second treatment head 1022 irradiate the target object.

[0081] Further, a detector may be provided at a position opposite to the first treatment head 1021 and / or the second treatment head 1022. In this example, a detector 1051 is provided at a position opposite to the first treatment head 1021, and a detector 1052 is provided at a position opposite to the second treatment head 1022, respectively for acquiring the radiotherapy rays passing through the target object. Of course, the detector 1051 may be provided only at a position opposite to the first treatment head 1021, or the detector 1052 may be provided only at a position opposite to the second treatment head 1022.

[0082] Here, the first treatment head 1021 and the second treatment head 1022 may be treatment heads of different modes, and the radiation sources of the first treatment head 1021 and the second treatment head 1022 may be the same or different. Exemplarily, the first treatment head 1021 located between the oppositely arranged magnet assemblies 103 may be a gamma ray treatment head, specifically a gamma ray focusing treatment head, and the second treatment head 1022 located at the through hole of the magnet assembly 1031 may be an X-ray treatment head, specifically an X-ray conformal intensity modulated treatment head.

[0083] It is understood that the above radiotherapy system may include more treatment heads, for example, three. Fig.11 As shown, the treatment head 102 includes a first treatment head 1021, a second treatment head 1022 and a third treatment head 1023. The first treatment head 1021 and the third treatment head 1023 are located on both sides between two oppositely arranged magnet assemblies 1031 and magnet assemblies 1032, and the second treatment head 1022 is located at the through hole of the magnet assembly 1031. Here, the first treatment head 1021 can be a gamma-ray focusing treatment head, the second treatment head 1022 can be an X-ray conformal intensity modulated treatment head, and the third treatment head 1023 can be a gamma-ray conformal intensity modulated treatment head. Of course, the above-mentioned radiotherapy system can include four, five or more treatment heads, which is not specifically limited in this application. Among them, the treatment head located between the oppositely arranged magnet assemblies can be a gamma-ray treatment head, and the treatment head located at the through hole can be a gamma-ray treatment head or an X-ray treatment head.

[0084] See also Fig.12 , Fig.12 The magnetic resonance imaging device provided in the embodiment of the present application includes: magnet assemblies 201 arranged opposite to each other, namely magnet assembly 2011 and magnet assembly 2012, for forming a uniform magnetic field for imaging; the magnet assemblies 201 arranged opposite to each other have a central axis P, and the closer to the central axis P, the greater the distance between the inner surfaces of the magnet assemblies arranged opposite to each other, and the farther away from the central axis P, the smaller the distance between the inner surfaces of the magnet assemblies arranged opposite to each other.

[0085] Furthermore, the magnetic resonance imaging device 200 may further include a frame 202 , on which the magnet assemblies 201 arranged opposite to each other are arranged.

[0086] The magnetic resonance imaging apparatus 200 may further include a patient support device 203 for supporting a target object.

[0087] It should be noted that the arrangement of the magnet assemblies 201 arranged opposite to each other is the same as that of the magnet assemblies arranged opposite to each other in the magnetic resonance imaging device 103 described above, and will not be described in detail herein.

[0088] When the magnetic resonance imaging device in the embodiment of the present application performs magnetic resonance imaging, the magnetic field formed by the relatively arranged magnet assemblies is used to perform nuclear magnetic imaging on the target object to be treated to generate a nuclear magnetic image. Since the distance between the inner surfaces of the relatively arranged magnet assemblies is larger as they are closer to the central axis of the relatively arranged magnet assemblies, the imaging space of the magnetic resonance imaging device is increased, thereby reducing or alleviating the discomfort of the target object in the imaging treatment space.

[0089] The above is a detailed introduction to a magnetic resonance imaging-guided radiotherapy system and a magnetic resonance imaging device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A magnetic resonance imaging guided radiotherapy system, characterized in that: include: A rotating frame that can rotate around a preset rotation axis; a treatment head, which can rotate with the rotation of the rotating frame and is used to emit radiotherapy rays to the target object; A magnetic resonance imaging device comprises two magnet assemblies which are arranged on the rotating frame in a circumferential direction thereof and are used to form an imaging magnetic field. The imaging magnetic field has an overlapping area with the radiotherapy rays and is used to perform magnetic resonance imaging on the target object. The central axes of the magnet assemblies arranged in opposite directions form a preset angle with the rotating axis, and the closer to the central axes, the greater the distance between the inner surfaces of the magnet assemblies arranged in opposite directions.

2. The system according to claim 1, characterized in that The treatment head is located between oppositely arranged magnet assemblies; or, At least one of the relatively arranged magnet assemblies has a through hole in the direction of the central axis, and accordingly, the treatment head is located at the through hole, and the emitted radiotherapy rays irradiate the target object.

3. The system according to claim 2, characterized in that The treatment head comprises a first treatment head and a second treatment head, wherein the first treatment head and the second treatment head are respectively located at two sides between oppositely arranged magnet assemblies.

4. The system according to claim 2, characterized in that The treatment head comprises a first treatment head and a second treatment head, wherein the first treatment head is located between two oppositely arranged magnet assemblies, and the second treatment head is located at the through hole, and the emitted radiotherapy rays irradiate the target object.

5. The system according to claim 2, characterized in that The treatment head located between the oppositely arranged magnet assemblies is a gamma ray treatment head, and the treatment head located at the through hole is a gamma ray treatment head or an X-ray treatment head.

6. The system according to claim 1, characterized in that At least one of the relatively arranged magnet assemblies includes a plurality of magnets, and the plurality of magnets are arranged in sequence along the direction of the central axis.

7. The system according to claim 6, characterized in that The multiple magnets are nested and arranged.

8. The system according to claim 6, characterized in that At least one of the plurality of magnets has a different thickness than the other magnets.

9. The system according to claim 6, characterized in that A transition piece is arranged between at least two magnets among the plurality of magnets, and the transition piece is made of non-magnetic material.

10. The system according to claim 1, characterized in that The inner surface of at least one of the magnet assemblies arranged opposite to each other is curved or stepped.

11. The system according to claim 1, characterized in that The radiotherapy system further includes a detector, which is disposed at a position opposite to the treatment head and is used to receive the radiotherapy rays emitted by the treatment head and generate corresponding image data.

12. The system according to claim 11, characterized in that The system further comprises: a patient support device, wherein the patient support device can be moved into or out of the overlapping area along the direction of the rotation axis, and the detector is connected to the patient support device and can move along with the movement of the patient support device.

13. A magnetic resonance imaging device, characterized in that: include: The magnet assemblies are arranged opposite to each other and are used to form a magnetic field for imaging; The oppositely disposed magnet assemblies have a central axis, and the closer to the central axis, the greater the distance between the inner surfaces of the oppositely disposed magnet assemblies.

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