CN105233425A - Radiation therapy system guided by magnetic resonance image - Google Patents
Radiation therapy system guided by magnetic resonance image Download PDFInfo
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- CN105233425A CN105233425A CN201510572355.2A CN201510572355A CN105233425A CN 105233425 A CN105233425 A CN 105233425A CN 201510572355 A CN201510572355 A CN 201510572355A CN 105233425 A CN105233425 A CN 105233425A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
- A61N2005/1055—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using magnetic resonance imaging [MRI]
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Abstract
The invention discloses a radiation therapy system guided by a magnetic resonance image, which comprises a radiation therapy assembly and a magnetic resonance assembly, wherein the radiation therapy assembly comprises a therapy head, a therapy arm and a rack, and the therapy head is arranged on the rack via the therapy arm; the magnetic resonance assembly is arranged on the rack; the outer wall of the magnetic resonance assembly is provided with accommodating space; and the therapy head is at least partially placed in the accommodating space. According to the radiation therapy system guided by the magnetic resonance image, the magnetic resonance assembly and the radiation therapy assembly are integrated as a whole, the magnetic resonance assembly can be used for carrying out real-time imaging on a therapy part while radiation therapy is carried out, a focus can be positioned more accurately, and the focus part therapy conditions can be observed in real time.
Description
Technical field
The present invention relates to field of medical device, especially a kind of radiotherapy system of guide of magnetic resonant image.
Background technology
Local therapeutic approaches important when radiotherapy (RT) is treatment malignant tumor.The cancer patient of nearly 70% needs to use radiotherapy in the process of Therapeutic cancer.The function and position of radiotherapy in oncotherapy becomes increasingly conspicuous.Radiotherapy has become one of Main Means for the treatment of malignant tumor.Clinac is the large medical equipment for cancer radiation therapy, and it, by producing X-ray and electric wire, carries out direct irradiation to the tumor in patient body, thus reaches the object eliminated or reduce tumor.
Clinac major part can not in real time to therapentic part imaging while treatment, but need first to make film in other imaging device (such as B ultrasonic, CT or magnetic resonance MR) to locate lesions position, then patient is needed to shift out from imaging device together with sick bed, put into linear accelerator again and carry out radiation therapy, now need to reorientate sick bed.Visible, this linear accelerator and Therapeutic Method need mobile patient, and carry out twice location, therefore, its positioning time is longer, and, realtime imaging can not be carried out in the process for the treatment of, treatment precision is not high, particularly to the position with breathing movement such as pulmonary, chest, cannot accurately treat.
For the treatment of mobile organ, occurred the integrating device of magnetic resonance equipment (MR) and linear accelerator (LINAC), i.e. the radiotherapy system of guide of magnetic resonant image, this system opens radiocurable New view.In prior art, the radiotherapy system of guide of magnetic resonant image, is divided into the following two kinds type usually.
One be linear accelerator in conjunction with open type magnetic resonance system, this system comprises magnetic resonance system and linear accelerator system.As shown in Figure 1, magnetic resonance system comprises separate type magnet, and this separate type magnet is broken as left and right two parts along magnet axis direction, intermediate formation gap 1, and namely this separate type magnet comprises the first magnet 2 and the second magnet 3 be separated by gap 1.Linear accelerator system comprises treatment 4, and the beam of this treatment 4 irradiates the patient on sick bed 5 by this gap 1.The treatment of linear accelerator 4 can rotate around magnet axis direction.
Separate type magnet is employed in this scheme, because the first magnet 2 and the second magnet 3 are separate, therefore need to be that the first magnet 2 and the second magnet 3 all configure cooling system and control system, increase cost on the one hand, cause open type magnetic resonance system price expensive, on the other hand, each magnet controls separately, more difficult uniformity and the stability realizing the main field that two magnets produce, and control complicated.The uniformity of main field and stability are the important performance indications of two of magnetic resonance system, two magnets individually configure stability and the uniformity that cooling system is comparatively difficult to ensure card temperature, temperature is unstable or uneven easily causes magnetic field drift, cause magnetic field unstable, and, control the first magnet 2 and the second magnet 3 separately, the comparatively raw uniform main field of difficult labour, therefore two magnets control separately mutually, more difficult uniformity and the stability realizing main field, and control complicated.
Another kind be linear accelerator in conjunction with traditional superconducting magnetic resonance system, as shown in Figure 2, the treatment 1 of linear accelerator is positioned over beyond magnetic resonance system 2 within the system.Magnetic resonance system 2 comprises magnet assembly, generally, magnet assembly comprises main magnet, gradient coil assembly and RF (radio frequency) coil block, and ray needs just can be irradiated to patient through magnet assembly, therefore ray attenuation is serious, causes therapeutic efficiency low.And, the size of magnetic resonance system 2 is comparatively large, and treatment 1 is positioned over outside magnetic resonance system 2, and the distance causing treating between 1 and isocenter point becomes far away, the size of entire system not only can be caused to become large, and, arrive square being inversely proportional to, apart from far away of effective dose and the distance of patient, the effective dose then arriving patient is less, therefore, the distance for the treatment of between 1 and isocenter point becomes long-range guided missile and causes the effective dose arriving patient and diminish, and therapeutic efficiency is low.Under normal circumstances, in different radiotherapy systems, treatment head is roughly the same with the distance between isocenter point, and this distance is called as conventional distance, like this be arranged so that the information between different radiotherapy systems can be general, or only need fine setting mutually to apply.If the distance between treatment head and isocenter point becomes far away, cause the information between other radiotherapy system can not be general, especially radiotherapy treatment planning can not be general, such as, because treatment head is different from the distance between isocenter point, then identical beam is waiting the field size on median plane different, its medium median plane referred to isocenter point, and perpendicular to the plane of beam centre axle, therefore, for identical therapy area, needs recalculate and adjust the parameter of radiotherapy treatment planning and other radiotherapy system.In radiation therapy technology, the dose uniformity of tumor target should be made, and the existence of penumbra have impact on the uniformity of dosage as far as possible, along with the distance between treatment head and isocenter point becomes far, penumbra can be caused to increase, have impact on the degree of accuracy for the treatment of.
Summary of the invention
In order to solve the problems of the prior art, the present invention proposes a kind of radiotherapy system of guide of magnetic resonant image, magnetic resonance assembly and radiotherapy assembly combine together by this system, can at the radiocurable magnetic resonance assembly that utilizes simultaneously to therapentic part realtime imaging, realize locating focus more accurately, Real Time Observation lesions position treatment situation.Further, this system comparatively easily realizes uniformity and the stability of main field, and can shorten the distance between treatment head and isocenter point.
In order to reach described object, according to one embodiment of present invention, provide a kind of radiotherapy system of guide of magnetic resonant image, comprising:
Radiotherapy assembly, it comprises treatment head, treated arms and frame, and described treatment head is installed in described frame by described treated arms;
Magnetic resonance assembly, described magnetic resonance assembly is installed in described frame;
The outer wall of described magnetic resonance assembly arranges receiving space, and described treatment head is placed in described receiving space at least in part.
Optionally, the isocenter point of described radiotherapy assembly is roughly positioned on the axis of described magnetic resonance assembly, described radiotherapy assembly is provided with the first through hole along described axis direction, described magnetic resonance assembly is provided with the second through hole along described axis direction, and described first through hole and described second through hole have common axis line.
Optionally, the lower surface of described treatment head and the vertical dimension of described axis are 40 ~ 50 centimetres.
Optionally, the degree of depth of described receiving space is not less than 50 centimetres.
Optionally, described receiving space is shoulder hole.
Optionally, described shoulder hole comprises the first hole and the second hole, and described first hole is used for accommodating described treatment head, and described second hole is passed through for the beam allowing described treatment hair penetrate.
Optionally, the size in described second hole is less than the size in described first hole, described magnetic resonance assembly comprises main magnet and shielded coil, described first hole is positioned at outside described main magnet in the radial direction of magnetic resonance assembly, at the axis direction of magnetic resonance assembly between shielded coil, described second hole at the axis direction of magnetic resonance assembly between described main magnet.
Optionally, described receiving space is blind hole, and described blind hole is used for accommodating described treatment head.
Optionally, described magnetic resonance assembly comprises main magnet and shielded coil, described blind hole is positioned at outside described main magnet in the radial direction of magnetic resonance assembly, at the axis direction of magnetic resonance assembly between shielded coil, and the beam that described main magnet is penetrated for avoiding described treatment hair.
Optionally, described radiotherapy assembly also comprises base, and described frame is rotating to be supported on described base, and described magnetic resonance assembly rotates with the rotation of described treatment head with frame.
Optionally, described receiving space is one section of annular receiving space, the center of described annular receiving space is roughly positioned on described axis, described treatment head is installed in described frame by described treated arms is rotating, and described treatment head independently rotates relative to magnetic resonance assembly in described annular receiving space.
Optionally, the maximum angle that the maximum angle that independently rotates relative to magnetic resonance assembly in described annular receiving space of described treatment head and described magnetic resonance assembly and first of described treatment rotate is not less than 360 degree.
Optionally, described receiving space is annular receiving space, the center of described annular receiving space is roughly positioned on described axis, described treatment head is installed in described frame by described treated arms is rotating, and described treatment head independently rotates relative to magnetic resonance assembly in described annular receiving space.
Optionally, the central shaft of beam that described treatment hair is penetrated is substantially perpendicular to the main field direction of described magnetic resonance.Compared to the radiotherapy system of guide of magnetic resonant image of the prior art, magnetic resonance assembly and radiotherapy assembly combine together by the present invention, can at the radiocurable magnetic resonance assembly that utilizes simultaneously to therapentic part realtime imaging, realize locating focus more accurately, especially to the position with breathing movement, accurate treatment can be realized, and Real Time Observation lesions position treatment situation, so that judge whether to need to change treatment plan according to treatment situation; In magnetic resonance assembly of the present invention, magnet is as a whole, therefore only needs a set of cooling system and control system, reduce the cost of system, and cooling system relatively easy to control and electric current realizes uniformity and the stability of main field; In system of the present invention, treatment head is placed in receiving space at least in part, shorten the distance between treatment head and isocenter point, therefore, the size of radiotherapy system entirety can be reduced, improving the therapeutic efficiency of radiotherapy system and degree of accuracy, can make to treat Distance Shortened between head and isocenter point to conventional distance by arranging receiving space in the degree of depth of radial direction, make the information between radiotherapy system can be general; In system of the present invention, on the path of beam, barrier is less, and therefore ray attenuation is little, improves therapeutic efficiency.
Accompanying drawing explanation
Fig. 1 is guide of magnetic resonant image radiotherapy system schematic diagram of the prior art;
Fig. 2 is another guide of magnetic resonant image radiotherapy system schematic diagram of the prior art;
Fig. 3 is the schematic diagram of the radiotherapy system of guide of magnetic resonant image of the present invention;
Fig. 4 is the schematic diagram of radiotherapy assembly of the present invention;
Fig. 5 is the generalized section of the radiotherapy system embodiment one of guide of magnetic resonant image of the present invention;
Fig. 6 is the schematic diagram that the radiotherapy system of guide of magnetic resonant image of the present invention rotates to diverse location;
Fig. 7 is the generalized section of magnet in the embodiment of the present invention one;
Fig. 8 is the generalized section of the radiotherapy system embodiment two of guide of magnetic resonant image of the present invention.
Detailed description of the invention
Can understand, reproduce and use the technical scheme of the application for the ease of those of ordinary skill in the art, the description in description launches with specific embodiment.Apparently, under the prerequisite of the purport and scope that do not deviate from the application, those of ordinary skill in the art can make various distortion to the specific embodiment mentioned in description.Therefore, the present invention is not limited to that Examples below addresses, and the protection domain of the application is determined according to the scope of the claim of patent application.As described in the specification and claims, unless context clearly points out exceptional situation, the word such as " ", " ", " one " and (or) " being somebody's turn to do " not refers in particular to odd number, also can comprise plural number.In general, term " comprises " only points out with " comprising " step and element that comprise and clearly identifying, and these steps and element do not form one and exclusively to enumerate, and method or equipment also may comprise other step or element.In addition, herein " on ", D score, "left", "right", "front", "rear" be only exemplary description with reference to the accompanying drawings, instead of restrictive.
As described in the background art, the radiotherapy system of existing guide of magnetic resonant image, there is a lot of problem, such as can not carry out realtime imaging in the process for the treatment of, or expensive, control complexity, or ray attenuation is serious, therapeutic efficiency is low, or package size is large, radiocurable degree of accuracy is low, can not be general etc. with the radiotherapy treatment planning of the radiotherapy system of routine.
For this reason, this application provides a kind of radiotherapy system of guide of magnetic resonant image, comprise radiotherapy assembly and magnetic resonance assembly, radiotherapy assembly comprises treatment head, frame, base, described magnetic resonance assembly is installed in frame, the outer wall of described magnetic resonance assembly is provided with receiving space, and described treatment head is placed in receiving space at least in part.Magnetic resonance assembly and radiotherapy assembly combine together by the present invention, can at the radiocurable magnetic resonance assembly that utilizes simultaneously to therapentic part realtime imaging, realize locating focus more accurately, especially to the position with breathing movement, accurate treatment can be realized, and Real Time Observation lesions position treatment situation, so that judge whether to need to change treatment plan according to treatment situation; In magnetic resonance assembly of the present invention, magnet is as a whole, therefore only needs a set of cooling system and control system, reduce the cost of system, and cooling system relatively easy to control and electric current realizes uniformity and the stability of main field; In system of the present invention, treatment head is placed in receiving space at least in part, shorten the distance between treatment head and isocenter point, therefore, the size of radiotherapy system entirety can be reduced, improve therapeutic efficiency and the degree of accuracy of radiotherapy system, can make to treat Distance Shortened between head and isocenter point to conventional distance by arranging receiving space in the degree of depth of radial direction, making the information between radiotherapy system can be general; And barrier is less on course of the beam, little to ray attenuation, improve therapeutic efficiency.
Below in conjunction with accompanying drawing, clear, complete description is carried out to the technical scheme of the application.
Fig. 3 is the schematic diagram of the radiotherapy system of guide of magnetic resonant image of the present invention; Fig. 4 is the schematic diagram of radiotherapy assembly of the present invention.
As shown in Figure 3, the radiotherapy system of the guide of magnetic resonant image of the present embodiment, comprises radiotherapy assembly 100, magnetic resonance assembly 200 and bed assembly 300.Composition graphs 4, described radiotherapy assembly 100 comprises treatment 101, frame 102 and base 103, described treatment 101 is for being incorporated into tumor target by beam, it is installed in frame 102 by treated arms 104, described frame 102 is supported on base 103, and frame 102 is provided with through hole 105 in the horizontal direction.Described magnetic resonance assembly 200 is installed in frame 102, the outer wall of magnetic resonance assembly 200 is provided with receiving space 201, and described treatment 101 is placed in receiving space 201 at least in part, arranges a through hole 202 in described magnetic resonance assembly 200 in the horizontal direction.Described bed assembly 300 comprises pedestal 301, bed board 302, bed board 302 can move along horizontal direction, enter through hole 202 and through hole 105, during radiotherapy, tumor target is not only positioned at the coverage field of radiotherapy assembly, also be in the imaging region of magnetic resonance assembly 200, therefore, the radiotherapy system of the guide of magnetic resonant image of the present embodiment can utilize magnetic resonance assembly to carry out realtime imaging in radiation therapy process, realize locating focus more accurately, improve treatment precision, and can the treatment situation of Real Time Observation lesions position, so that judge whether to need to change treatment plan according to treatment situation.
In the present embodiment, the central shaft of described beam is substantially perpendicular to the main field direction of magnetic resonance assembly 200, magnetic resonance assembly 200 is the most frequently used cylinder type magnet, and it is as a whole, conventional control mode can be adopted to control this magnet, and two sub-magnets will be divided into control separately by magnet, it is simple, convenient and cost-saving therefore to control.
In the present embodiment, treatment 101 is placed in receiving space 201 at least in part, shortens the distance for the treatment of between 101 and isocenter point.Under normal circumstances, the external diameter of main magnet is approximately 2 meters, the isocenter point of radiotherapy assembly 100 is roughly positioned on the common axis line of through hole 202 and through hole 105, conventional distance between the lower surface for the treatment of 101 and isocenter point is approximately 40 ~ 50 centimetres, if treatment head is radially placed in outside main magnet, the distance for the treatment of between the lower surface of head and isocenter point is then caused to be not less than 1 meter, much larger than conventional distance.And in the present embodiment, the outer wall of magnetic resonance assembly 200 arranges receiving space 201, treatment 101 is placed in receiving space 201 at least in part, can makes to treat the Distance Shortened between 101 and isocenter point, therefore reduce the size of entire system; Meanwhile, owing to arriving square being inversely proportional to of effective dose and the distance of patient, the shortening for the treatment of the spacing of head and isocenter point improves the effective dose arriving patient, improves therapeutic efficiency.
The degree of depth arranging receiving space 201 is not less than 50 centimetres, then can make to treat head and move at least 50 centimetres toward near the direction of isocenter point, therefore, and can by the Distance Shortened for the treatment of between 101 and isocenter point to conventional distance.The distance for the treatment of between 101 and isocenter point is conventional distance, this or approximately equal equal with the distance for the treatment of in other radiotherapy system between head with isocenter point, therefore the parameter recalculating radiotherapy system is not needed, especially, do not need to reformulate radiotherapy treatment planning, that is, original radiotherapy treatment planning and other radiocurable parameter can be adopted, make the information between different radiotherapy system can be general; Because the routine distance between treatment head and isocenter point is not a fixed numbers, but certain numerical range, therefore, treatment head in each radiotherapy system may be different from the distance between isocenter point, but because the distance difference between treatment head and corresponding isocenter point is little, therefore, in the information between different radiotherapy system is general, only need to carry out finely tuning the requirement that can meet treatment to radiotherapy treatment planning or other radiation treatment parameters.
Further, the distance between treatment head and isocenter point is conventional distance, avoids the key parameters such as penumbra and is far deteriorated along with the change of distance, improve the degree of accuracy for the treatment of.
Fig. 5 is the generalized section of the radiotherapy system embodiment one of guide of magnetic resonant image of the present invention; Fig. 6 is the schematic diagram that the radiotherapy system of guide of magnetic resonant image of the present invention rotates to diverse location; Fig. 7 is the generalized section of magnet in the embodiment of the present invention one.
Embodiment one
The radiotherapy system of guide of magnetic resonant image as shown in Figure 5, comprises radiotherapy assembly 100, magnetic resonance assembly 200, not shown bed assembly.Described radiotherapy assembly 100 comprises treatment 101, frame 102, base 103, and treatment 101 is installed in frame 102 by treated arms 104, in frame 102, be provided with through hole 105 in the horizontal direction.Described magnetic resonance assembly 200 is installed in frame 102, the outer wall of magnetic resonance assembly 200 is arranged receiving space 201, described treatment 101 is placed in receiving space 201 at least in part, arrange a through hole 202 in described magnetic resonance assembly 200 in the horizontal direction, described through hole 105 and through hole 202 are coaxially arranged.
In the present embodiment, magnetic resonance assembly 200 and radiotherapy assembly 100 link into an integrated entity, and magnetic resonance assembly and radiotherapy assembly are rotated around common axis line, can realize dynamically, adjust the multimodality treatments such as strong, arcing, effectively treat patient.
During radiotherapy, beam needs from different launched field angular illumination tumor target, and therefore, treatment 101 can rotate around tumor target.In the present embodiment, frame 102 is supported on described base 103 by rotating in the circumferential, rotarily drives treatment 101 rotation by controlling frame 102.Because treatment 101 is placed in the receiving space 201 of magnetic resonance assembly 200 at least in part, in order to avoid magnetic resonance assembly 200 and treatment 101 is collided, magnetic resonance assembly 200 is set along with treatment 101 synchronous rotary, therefore, magnetic resonance assembly 200 is installed in frame 102, by rotary frame 102, treatment 101 and magnetic resonance assembly 200 synchronous rotary, avoid treating 101 collide from magnetic resonance assembly 200 while realize the treatment of different launched field angle.As shown in Figure 6, during radiotherapy, the radiotherapy system of guide of magnetic resonant image rotates to diverse location, meets the demand of beam from different launched field angular illumination tumor target.
Shown in composition graphs 7, magnetic resonance assembly comprises the main magnet 203 be made up of main coil 203a and 203b.Main magnet 203 forms stronger loss magnetic field around, the existence in loss magnetic field can produce very strong captivation to neighbouring ferromagnetic object, health, medical instruments and equipment etc. is made to be subject to infringement in various degree, interference and destruction, therefore magnetic resonance assembly also comprises shielded coil 204a and 204b, magnetic field outside main magnet 203 is shielded, the additional conventional components do not shown can also be comprised, such as gradient coil, RF (radio frequency) coil.Due to superconducting coil produce field strength high, stability and uniformity good, therefore main coil 203a and 203b and shielded coil 204a and 204b preferentially selects superconducting coil.Magnet cooling layer 207 is provided with successively from inside to outside toward the direction away from them around main magnet 203 and shielded coil 204a and 204b, magnet thermal shield 208, the outer vacuum layer 209 of magnet, magnet cooling layer 207, magnet thermal shield 208, outer vacuum layer 209 combined effect of magnet provides ultra-low temperature surroundings, namely main magnet 203 is housed in magnet cooling layer 207, that is, main coil 203a and 203b is in same ultra-low temperature surroundings, share same set of cooling system, therefore the uniformity of main coil 203a relatively easy to control and 203b temperature and stability, thus be conducive to keeping magnetic field's regularity and stability.In the present embodiment, magnet cooling layer can comprise the material that liquid helium etc. can produce ultra-low temperature surroundings.
Described main coil 203a and 203b is wrapped in through hole 202 around, in the present embodiment, main coil 203a and 203b is wrapped on main coil reel 205, when electric current is by main coil 203a and 203b, in through hole 202, produce main field, the direction of main field can be parallel to the axis of through hole 202.
The magnetic field intensity that main coil produces is determined by the number of turn of coil and electric current, and the number of turn of coil determined in the design phase of magnet, therefore mainly considered electric current in actual use, and the electric current namely in demand fulfillment coil is equal and keep stablizing.In the present embodiment, path is formed between main coil 203a and 203b, once energising, all main coils pass through by identical electric current, therefore, only need a set of control system can produce even, stable main field by control coil 203a and 203b easily, the ER effect in this relation control two magnets obtains easily.
Only need a set of cooling system and control system in the present embodiment, while guarantee magnetic field's regularity and stability, also reduce the cost of system.
The diameter of shielded coil 204a and 204b is greater than the diameter of main coil 203a and 203b, and the axis direction along through hole 202 is symmetrically distributed in main magnet 203 two ends, and is wrapped in respectively on corresponding shielded coil reel 206a and 206b.The sense of current in shielded coil is contrary with the sense of current in main coil, for shielding the loss magnetic field outside main magnet, reduces the infringement to health, medical instruments and equipment etc., interference and destruction.
In the present embodiment, the imaging area of magnetic resonance assembly is the region around the isocenter point of radiotherapy system, in order to form even, stable main field in imaging area, main coil 203a and 203b should be made close to each other in the axial direction as far as possible.
In the present embodiment, described receiving space 201 is shoulder hole, comprises the first hole 201a and the second hole 201b.Described first hole 201a is communicated with magnet cooling layer 207, magnet thermal shield 208, the outer vacuum layer 209 of magnet with the second hole 201b, formation one through hole radially.
As shown in Figure 5, first hole 201a radial direction is positioned at beyond main coil 203a and 203b, axis direction is between shielded coil 204a and 204b, second hole 201b at axis direction between main coil 203a and 203b, treatment 101 is placed in the first hole 201a at least in part, and does not enter the second hole 201b.Therefore, relative treatment that the size of the second hole 201b can be arranged 101 is less, thus space is stopped in the setting of circle 203a and 203b that serve as theme, make its in the axial direction between distance less.
Generally speaking, the internal diameter of the main magnet of magnetic resonance assembly is generally 60 ~ 70 centimetres, conventional distance between the lower surface for the treatment of head and isocenter point is 40 ~ 50 centimetres, therefore, when distance between the lower surface for the treatment of 101 and isocenter point is set to conventional distance, in radial directions, the space also leaving 5 ~ 20 centimetres may be used for arranging main magnet 203, in the axial direction, distance between main coil 203a and 203b is not less than the size of the second hole 201b, by reducing the size of the second hole 201b, make main coil 203a and 203b can be as far as possible close in the axial direction, be conducive to producing evenly, stable main field.
Because the first hole 201a and the second hole 201b forms through hole, therefore, the course of the beam in main magnet does not exist barrier, and ray is undamped, and therapeutic efficiency is high.In the present embodiment, the size of the first hole 201a is enough to put into treatment head, and its shape is unrestricted, and can be circular, also can be other polygon; The size of the second hole 201b is subject to the restriction of beam width, require not stop ray, can be calculated by simple geometrical relationship according to the parameter such as internal diameter of the angle of beam, distance between treatment head and isocenter point, magnetic resonance assembly, the shape of the second hole 201b is unrestricted.
In the technical scheme of this embodiment, bed assembly is utilized patient to be placed in through hole 202, tumor target is made not only to be positioned at the coverage field of radiotherapy assembly, also be in the imaging region of magnetic resonance assembly 200, can at the radiocurable magnetic resonance assembly that utilizes simultaneously to therapentic part realtime imaging, to realize locating focus more accurately, especially to the position with breathing movement, accurate treatment can be realized, and can the treatment situation of Real Time Observation lesions position, so that judge whether to need to change treatment plan according to treatment situation; In the magnetic resonance assembly of the present embodiment, magnet is as a whole, and Nonseparation magnet, therefore only need a set of cooling system and control system, the cost of reduction system, and cooling system relatively easy to control and control system realize uniformity and the stability of main field; In the system of the present embodiment, treatment head is placed in magnetic resonance assembly at least in part, make to treat the Distance Shortened between head and isocenter point, therefore, the size of radiotherapy system entirety can be reduced, improving the therapeutic efficiency of radiotherapy system and degree of accuracy, can make to treat Distance Shortened between head and isocenter point to conventional distance by arranging receiving space in the degree of depth of radial direction, make the information between radiotherapy system can be general; In the system of the present embodiment, the path of the beam in main magnet does not exist barrier ray being produced to decay, improve therapeutic efficiency.In the present embodiment, receiving space 201 is shoulder hole, and is formed as through hole, and in other embodiments, receiving space 201 can be other form, and such as Fig. 8 is the generalized section of the radiotherapy system embodiment two of guide of magnetic resonant image of the present invention.
Embodiment two
The radiotherapy system of guide of magnetic resonant image as shown in Figure 8, comprises radiotherapy assembly 100, magnetic resonance assembly 200, not shown bed assembly.Described radiotherapy assembly 100 comprises treatment 101, frame 102, base 103, and treatment 101 is installed in frame 102 by treated arms 104, in frame 102, be provided with through hole 105 in the horizontal direction.Described magnetic resonance assembly 200 is installed in frame 102, the outer wall of magnetic resonance assembly 200 is arranged receiving space 201, described treatment 101 is placed in receiving space 201 at least in part, arrange a through hole 202 in described magnetic resonance assembly 200 in the horizontal direction, described through hole 105 and through hole 202 are coaxially arranged.
The present embodiment is roughly the same with the structure of embodiment one, difference is only, in the present embodiment, receiving space 201 is blind hole, as shown in Figure 8, forms a groove at the outer wall of magnetic resonance assembly 200, described treatment 101 is placed in described groove at least in part, treatment 101 and magnetic resonance assembly 200, around common axis line synchronous rotary, can realize dynamically, adjust the multimodality treatments such as strong, arcing, effectively treat patient.
The magnet cooling layer 207 arranged around main magnet 203 and shielded coil 204a and 204b, magnet thermal shield 208, the outer vacuum layer 209 of magnet are continuous at blind hole 201 place, in the present embodiment, the imaging area of magnetic resonance assembly is the region around the isocenter point of radiotherapy system, in order to form even, stable main field in imaging area, main coil 203a and 203b should be made close to each other in the axial direction as far as possible.
In the present embodiment, blind hole 201 radial direction is positioned at beyond main coil 203a and 203b, and axis direction is between shielded coil 204a and 204b, and treatment 101 is placed in blind hole 201 at least in part.As shown in Figure 8, the Spatial continual between main coil 203a and 203b, therefore has enough spatial placement main coil 203a and 203b, make its in the axial direction between distance less.
Generally speaking, the internal diameter of the main magnet of magnetic resonance assembly is generally 60 ~ 70 centimetres, conventional distance between the lower surface for the treatment of head and isocenter point is 40 ~ 50 centimetres, therefore, when distance between the lower surface for the treatment of 101 and isocenter point is set to conventional distance, in radial directions, the space also leaving 5 ~ 20 centimetres may be used for arranging main magnet 203, in the axial direction, as long as any barrier does not cause treating an excessive attenuation for 101 rays launched, be preferably the path that main coil 203a and 203b avoids beam, the wall thickness being preferably the reel 205 of main magnet 203 is as far as possible little, the reel 205 being preferably main magnet 203 avoids the path of beam.Do not need between main coil 203a and 203b to form hole, make main coil 203a and 203b can be as far as possible close in the axial direction, be conducive to producing even, stable main field.
Barrier on course of the beam in main magnet can not to ray excessive attenuation, and therapeutic efficiency is high.In the present embodiment, the size of blind hole 201 is enough to put into treatment head, and its shape is unrestricted, and can be circular, also can be other polygon; Distance between main coil 203a and 203b is subject to the restriction of beam width, requires not stop ray, can according to the angle of beam, treat distance between head and isocenter point, the parameter such as internal diameter of magnetic resonance assembly calculated by simple geometrical relationship.
In the technical scheme of this embodiment, bed assembly is utilized patient to be placed in through hole 202, tumor target is made not only to be positioned at the coverage field of radiotherapy assembly, also be in the imaging region of magnetic resonance assembly 200, can at the radiocurable magnetic resonance assembly that utilizes simultaneously to therapentic part realtime imaging, to realize locating focus more accurately, especially to the position with breathing movement, accurate treatment can be realized, and can the treatment situation of Real Time Observation lesions position, so that judge whether to need to change treatment plan according to treatment situation; In the magnetic resonance assembly of the present embodiment, magnet is as a whole, and Nonseparation magnet, therefore only need a set of cooling system and control system, the cost of reduction system, and cooling system relatively easy to control and control system realize uniformity and the stability of main field; In the system of the present embodiment, treatment head is placed in magnetic resonance assembly at least in part, make to treat the Distance Shortened between head and isocenter point, therefore, reduce the size of radiotherapy system entirety, improving the therapeutic efficiency of radiotherapy system and degree of accuracy, can make to treat Distance Shortened between head and isocenter point to conventional distance by arranging receiving space in the degree of depth of radial direction, make the information between radiotherapy system can be general; In the system of the present embodiment, the decay that on the path of the beam in main magnet, barrier produces ray is less, improves therapeutic efficiency.
In the present embodiment, receiving space 201 is blind hole, and in other embodiments, receiving space 201 can be other form, with reference to following embodiment.
Embodiment three
In above-described embodiment one and embodiment two, described magnetic resonance assembly 200 and radiotherapy assembly 100 synchronous rotary, in the present invention, also other situation can be had, such as, described receiving space 201 is annular receiving space, the center of described annular receiving space is roughly positioned in magnet axis, described treatment 101 is placed in described receiving space 201 at least in part, described treatment 101 is installed in frame 102 by treated arms 104 is rotating, frame 102 is fixedly installed on base 103, described magnetic resonance assembly 200 is installed in frame 102, in this embodiment, the outer wall of magnetic resonance assembly 200 is arranged annular receiving space 201, treatment 101 independently rotates around axis in annular receiving space relative to magnetic resonance assembly 200, can realize dynamically, adjust strong, the multimodality treatments such as arcing, patient is effectively treated.
Embodiment four
Introduce a kind of another kind of receiving space 201 being different from above-described embodiment in the present embodiment, described receiving space 201 is one section of annular receiving space, the center of described annular receiving space is roughly positioned in magnet axis, described treatment 101 is placed in described receiving space 201 at least in part, described treatment 101 is rotatably installed in frame 102 by treated arms 104, treatment 101 can independently in annular receiving space relative to magnetic resonance assembly 200 be rotated, described magnetic resonance assembly 200 is installed in frame 102, frame 102 is rotatably installed on base 103, treatment 101 can be rotated along with the rotation of frame together with magnetic resonance assembly 200.As long as meet described treatment 101 maximum angle rotated together with magnetic resonance assembly 200 and described treatment 101 independent of the maximum angle sum that magnetic resonance assembly 200 rotates be not less than 360 degree can realize dynamically, adjust by force, the multimodality treatment such as arcing, patient is effectively treated.
In above-described embodiment three and embodiment four, still only need a set of cooling system and control system, while guarantee magnetic field's regularity and stability, also reduce the cost of system.Shoulder hole in above-described embodiment one and embodiment two or blind hole also can be attached in embodiment by those skilled in the art, such as annular receiving space 201 can be through hole in radial direction, such as shoulder hole, also can be blind hole, treatment 101 is placed in described annular receiving space 201 at least in part, make to treat the Distance Shortened between 101 and isocenter point, therefore, the size of radiotherapy system entirety can be reduced, improve therapeutic efficiency and the degree of accuracy of radiotherapy system, can make to treat a Distance Shortened between 101 and isocenter point to conventional distance by arranging annular receiving space 201 in the degree of depth of radial direction, make the information between radiotherapy system can be general, in the system of the present embodiment, the course of the beam in main magnet does not exist the barrier of decay is produced to ray or barrier decay that ray is produced less, raising therapeutic efficiency.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (14)
1. a radiotherapy system for guide of magnetic resonant image, comprising:
Radiotherapy assembly, it comprises treatment head, treated arms and frame, and described treatment head is installed in described frame by described treated arms;
Magnetic resonance assembly, described magnetic resonance assembly is installed in described frame;
The outer wall of described magnetic resonance assembly arranges receiving space, and described treatment head is placed in described receiving space at least in part.
2. radiotherapy system as claimed in claim 1, it is characterized in that, the isocenter point of described radiotherapy assembly is roughly positioned on the axis of described magnetic resonance assembly, described radiotherapy assembly is provided with the first through hole along described axis direction, described magnetic resonance assembly is provided with the second through hole along described axis direction, and described first through hole and described second through hole have common axis line.
3. radiotherapy system as claimed in claim 2, it is characterized in that, the lower surface of described treatment head and the vertical dimension of described axis are 40 ~ 50 centimetres.
4. radiotherapy system as claimed in claim 1, it is characterized in that, the degree of depth of described receiving space is not less than 50 centimetres.
5. radiotherapy system as claimed in claim 1, it is characterized in that, described receiving space is shoulder hole.
6. radiotherapy system as claimed in claim 5, it is characterized in that, described shoulder hole comprises the first hole and the second hole, and described first hole is used for accommodating described treatment head, and described second hole is passed through for the beam allowing described treatment hair penetrate.
7. radiotherapy system as claimed in claim 6, it is characterized in that, the size in described second hole is less than the size in described first hole, described magnetic resonance assembly comprises main magnet and shielded coil, described first hole is positioned at outside described main magnet in the radial direction of magnetic resonance assembly, at the axis direction of magnetic resonance assembly between shielded coil, described second hole at the axis direction of magnetic resonance assembly between described main magnet.
8. radiotherapy system as claimed in claim 1, it is characterized in that, described receiving space is blind hole, and described blind hole is used for accommodating described treatment head.
9. radiotherapy system as claimed in claim 8, it is characterized in that, described magnetic resonance assembly comprises main magnet and shielded coil, described blind hole is positioned at outside described main magnet in the radial direction of magnetic resonance assembly, at the axis direction of magnetic resonance assembly between shielded coil, and described main magnet is arranged to avoid the beam that described treatment hair is penetrated.
10. radiotherapy system as claimed in claim 2, it is characterized in that, described radiotherapy assembly also comprises base, and described frame is rotating to be supported on described base, and described magnetic resonance assembly rotates with the rotation of described treatment head with frame.
11. radiotherapy systems as claimed in claim 10, it is characterized in that, described receiving space is one section of annular receiving space, the center of described annular receiving space is roughly positioned on described axis, described treatment head is installed in described frame by described treated arms is rotating, and described treatment head independently rotates relative to magnetic resonance assembly in described annular receiving space.
12. radiotherapy systems as claimed in claim 11, it is characterized in that, the maximum angle that the maximum angle that described treatment head independently rotates relative to magnetic resonance assembly in described annular receiving space and described magnetic resonance assembly and first of described treatment rotate is not less than 360 degree.
13. radiotherapy systems as claimed in claim 2, it is characterized in that, described receiving space is annular receiving space, the center of described annular receiving space is roughly positioned on described axis, described treatment head is installed in described frame by described treated arms is rotating, and described treatment head independently rotates relative to magnetic resonance assembly in described annular receiving space.
14. radiotherapy systems as claimed in claim 1, is characterized in that, the central shaft of the beam that described treatment hair is penetrated is substantially perpendicular to the main field direction of described magnetic resonance.
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