CN102680925B - 360-degree-open magnet for permanent magnet type medical magnetic resonance imaging system - Google Patents
360-degree-open magnet for permanent magnet type medical magnetic resonance imaging system Download PDFInfo
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- CN102680925B CN102680925B CN201110064702.2A CN201110064702A CN102680925B CN 102680925 B CN102680925 B CN 102680925B CN 201110064702 A CN201110064702 A CN 201110064702A CN 102680925 B CN102680925 B CN 102680925B
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Abstract
The invention discloses a 360-degree-open magnet for a permanent magnet type medical magnetic resonance imaging system. The magnet comprises a rectangular main frame, as well as two magnetic poles which are relatively mounted on the main frame up and down, wherein the main frame comprises an upper part cross yoke, a lower part cross yoke, and vertical yokes on the left side and the right side; an upper iron pier is fixed in the middle of the bottom surface of the upper part cross yoke; a lower iron pier is fixed in the middle of the top surface of the lower part cross yoke; and the main magnetic poles are respectively fixed with the upper iron pier and the lower iron pier; a reinforcing rib is arranged on the top surface of the upper part cross yoke; and the distance between the two vertical yokes is larger than the maximum size of the main magnetic poles on the horizontal direction by two times. According to the invention, a larger frame type magnetic circuit design scheme is adopted, the space surrounding the magnetic poles is larger enough, a patient to be examined can be moved vertically and horizontally and rotated at 360 degrees when a sickbed and bed boards are in combination motion between the upper and the lower magnetic poles, so that a doctor can approach the magnetic poles in any direction to heal the patient conveniently between the upper and the lower magnetic poles.
Description
Technical field
The invention belongs to medical instruments field, be specifically related to a kind of open type magnetic body structure of permanent-magnet type medical nuclear magnetic resonance imaging system.
Background technology
Nineteen forty-six, the Purcell of Harvard University and the Bloch of Stanford University has found nmr phenomena independently of one another, and they rely on this to win the Nobel prize for physics of nineteen fifty-two in physics and chemically relevant achievement.Along with people are to the development of magnetic resonance applications research, finally last century early eighties be successfully proposed commodity machine for human body imaging, for human body medical diagnosis provides advanced technology means.
Medical nuclear magnetic resonance imaging system forms primarily of the major part such as magnet system, spectrometer system, gradient system, radio-frequency transmissions and receiving system, computer system (comprising interface, application software, scanning sequence), shielding house.Magnet provides a constant magnetic field for magnetic resonance system, and its indices (as field intensity, uniformity coefficient, degree of stability, periphery openness, upper lower magnetic pole clear space etc.) directly determines the convenience of image quality and use.And the feature of magnet is used to the classification dividing magnetic resonance system, as can be divided into superconduct system, normal conductivity type system, permanent-magnet type system by magnet manufactured materials feature; Low field system, mid-field systems, high field systems can be divided into by the field intensity feature of magnet; Can be divided into open with non-open type system by magnet configurations feature.
Current open formula magnet is mostly C type or Double-pillar, generous C type back or thick twin columns have sheltered from the open visual field largely, sick bed cannot realize the rotation of large-scale translation and wide-angle, therefore the shielding house installing medical nuclear magnetic resonance imaging system at present only can be used for image-forming diagnose, and doctor cannot carry out treatment activity expediently between upper lower magnetic pole.
Such as Chinese invention patent CN101191828B discloses a kind of full-open permanent magnetism magnetic body for magnetic resonance image-forming, this permanent-magnet comprises the full open model main structure in flat wide hollow structure be made up of two vertical yokes be symmetrically arranged and about two the horizontal yokes be arranged symmetrically with, and the air gap district of this permanent-magnet is positioned at the middle part of described full open model main structure; Upper and lower two parallel relative main poles are positioned at upper and lower two horizontal yokes near side, air gap district and link together with upper and lower two horizontal yokes respectively; Upper and lower two groups of parallel upper bottom crown groups are relatively positioned at upper and lower two main poles near side, air gap district and link together with upper and lower two main poles respectively; Wherein, this full open model main structure is in flat wide hollow viewed from front, and upper and lower two horizontal yokes are parallel positioned opposite, and the vertical yoke in two, left and right is parallel positioned opposite; Two horizontal yokes be symmetrical, front and back are symmetrical and laterally zygomorphic structure, about it, the outside of two far-ends adopts stepped construction; From front, horizontal two ends, yoke left and right become stepped away from the side of vertical yoke, ladder number is three to four, and the thickness of each ladder is 1/1 to three/4th of horizontal yoke gross thickness, and the length of each ladder is a thirtieth to ten 1/5th of horizontal yoke total length.Two horizontal yoke center sections eliminate portion of material away from the side of main pole, and the horizontal yoke removed after material still keeps symmetrical, front and back symmetrical structure; From front, do not consider the staircase structure of horizontal yoke two far-end, the center section thickness of horizontal yoke is minimum, for total thickness 2/1 to three/3rds between, from the center section of horizontal yoke to two far-ends, its thickness increases gradually, until equal with total thickness; The center section of horizontal yoke after described removal material, on its fore-and-aft direction, through horizontal yoke, is of a size of 2/3rds of main pole external diameter in the lateral direction.
This patent CN101191828B, by getting on except the mode of material at horizontal yoke, makes magnetic flux inner integrated to yoke, and alleviates the general assembly (TW) of yoke.But obviously, distance in this structure between main pole and vertical yoke can not be very large, enough spaces can not be provided to carry out treatment activity for doctor to patient, if increase the distance between main pole and vertical yoke, the distortion of upper lateral yoke will certainly be increased, particularly the position of horizontal yoke mid-mounting main pole can produce significantly distortion and vibration, the middle part of adding horizontal yoke eliminates material again, weaken the rigidity of horizontal yoke further, the stability of magnet cannot be ensured.Therefore, this structure is only applicable to, in the less system of magnet horizontal span, cannot provide the space treated a patient.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of permanent-magnet type magnet of real 360 degree of great openings, on this magnet, lower magnetic pole surrounding is blocked without any, and have enough large space, sick bed and the aggregate motion of bed board between upper lower magnetic pole can ensure inspected object carry out cross shifting, 360 degree rotate, doctor from any orientation near magnetic pole, and can carry out treatment activity easily between upper lower magnetic pole.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of 360 degree of great opening magnets for permanent-magnet type medical nuclear magnetic resonance imaging system, the main frame comprising a rectangle and two main poles be relatively arranged on up and down in main frame, described main frame is by the horizontal yoke in top, the perpendicular yoke of the horizontal yoke in bottom and the left and right sides is formed, the centre position, bottom surface of the horizontal yoke in described top is fixed with Shang Tiedun, the end face centre position of the horizontal yoke in described bottom is fixed with Xia Tiedun, described main pole is separately fixed on Shang Tiedun and lower iron pier, the end face of the horizontal yoke in described top is provided with reinforcement, distance between inside described two perpendicular yokes is greater than described main pole maximum sized twice in left-right direction.
Preferably, the bight that horizontal yoke two ends, described top are connected with two perpendicular yokes is provided with reinforcing triangle.
Preferably, before and after the horizontal yoke in described bottom, two sides are fixed with feet.
Preferably, the surface that described two main poles are relative is also fixed with pole plate and grading ring respectively.
Preferably, the horizontal yoke in described top, the horizontal yoke in bottom, Shang Tiedun and lower iron pier are made by the cast steel material that magnetic property is good.
More preferably, be connected by bolted between the horizontal yoke in described top with upper iron pier.
More preferably, be connected by bolted between the horizontal yoke in described bottom with lower iron pier.
Preferably, the xsect of described lower Tie Dun lower end is less than the xsect of upper end.
More preferably, described Shang Tiedun is identical with the shape of lower iron pier and be arranged symmetrically with up and down, and the xsect of described Shang Tiedun and lower iron pier is circular.
More preferably, described Shang Tiedun is identical with the shape of lower iron pier and be arranged symmetrically with up and down, and the xsect of described Shang Tiedun and lower iron pier is square.
Compared with prior art, the present invention has significant beneficial effect:
A) because the present invention adopts big frame type magnetic loop design proposal, fully ensure there is enough large space around magnetic pole, sick bed and the aggregate motion of bed board between upper lower magnetic pole can ensure inspected object carry out cross shifting, 360 degree rotate, doctor from any orientation near magnetic pole, and can carry out treatment activity easily between upper lower magnetic pole.
B) the big frame type magnetic loop structure of the present invention's design, up and down, bilateral symmetry is good, and framework yoke is away from magnetic pole, for body even field provides good basis.
C) the big frame magnetic loop structure of the present invention's design, because thermal inertia is large, so the drift that field intensity causes by variation of ambient temperature is relatively slower, improves the stability in magnetic field.
D) end face of the horizontal yoke in top is provided with reinforcement, can provide good rigidity for the horizontal yoke in the top of large span, in safing situation, reduces yoke material cost.Reinforcement can reduce the vibration deformation of the horizontal yoke in top, ensures the stability of main magnet, thus can ensure good image quality.
Feet bottom the reinforcing trigonometric sum of e) upper corner also can improve the stability of system further.
F) setting of Shang Tiedun and lower iron pier, when ensureing main pole air gap, can increase the height space of magnet, making horizontal yoke also away from magnetic pole, be conducive to provide uniform magnetic field.
G) under, iron pier adopts up big and down small shape, is convenient to doctor more near main pole, and doctor is stood or is sitting in when main pole limit works, legs and feet have comfortable space.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the front elevation of a kind of 360 degree of great opening magnets for permanent-magnet type medical nuclear magnetic resonance imaging system of the present invention.
Fig. 2 is the perspective view of the magnet of great opening shown in Fig. 1.
Fig. 3 is the assembly relation schematic diagram of main pole part.
Fig. 4 is the front elevation of the second great opening magnet of the present invention.
Fig. 5 is the perspective view of the second great opening magnet of the present invention.
Fig. 6 is the mounting means schematic diagram of the present invention's 360 degree of great opening magnets in shielding house.
Embodiment
As shown in Figure 1 and Figure 2, a kind of 360 degree of great opening magnets for permanent-magnet type medical nuclear magnetic resonance imaging system of the present invention comprise the main frame of a rectangle, this main frame is made up of the perpendicular yoke 2 of the horizontal yoke in top 1, the horizontal yoke in bottom 4 and the left and right sides, the centre position, bottom surface of the horizontal yoke 1 in top is fixed with iron pier 7, and the end face centre position of the horizontal yoke in bottom 4 is fixed with lower iron pier 6.About two main poles be mounted opposite 8,9 are separately fixed on iron pier 7 and lower iron pier 6.The present invention is big frame, large span magnetic loop structure, distance between inside two perpendicular yokes 2 is greater than main pole maximum sized twice in left-right direction, in such as the present embodiment, Double layer iron pier 7,6 and two magnetic poles 8,9 are round section, and the distance L between inside two perpendicular yokes 2 is greater than the twice of main pole 8,9 maximum dimension D.When the present invention is arranged in shielding house, as shown in Figure 6, shielding house is wall 31, screen layer 32 and internal decorative layer 33 from outside to inside successively, main frame can be embedded between screen layer 32 and internal decorative layer 33, upper and lower main pole 8,9 and part Double layer iron pier is only had to be exposed to the central authorities of shielding house, there are enough spaces in the scope that can ensure around main pole 360 degree like this, rotate for sick bed and medical worker carries out treatment activity.
Continue with reference to Fig. 1, Fig. 2, in order to adapt to above-mentioned big frame, longspan structure, the end face of the present invention's horizontal yoke 1 on top is provided with reinforcement 10, the length direction of many reinforcements 10 horizontal yoke 1 along top be arranged in parallel, reinforcement 10 when increasing a lot of yoke material, can improve rigidity and the stability of the horizontal yoke 1 in top greatly.
In addition, in order to improve the stability of large span main frame structure further, the present embodiment bight that also horizontal yoke 1 two ends are connected with two perpendicular yokes 2 on top is provided with and reinforces triangle 5, this reinforcing triangle 5 adopts xsect to be the triangular prism structure of right-angle triangle, and two right-angle side respectively yoke 1 horizontal in top, perpendicular yoke 2 is fixedly connected with.Before and after the horizontal yoke in bottom 4, two sides also can fix the feet 3 of several angle shape respectively, to improve the stability of magnet further.
As shown in Figure 3, the xsect of lower iron pier 6 is circular, but the xsect of its lower end is less than the xsect of upper end.It is made up of the less cylinder of one section of diameter and one section of round platform, and the end diameter of round platform is identical with the diameter of cylinder and be connected.Lower main pole 9 is also round section, and can be bondd by Nd-Fe-B magnet steel and form, be fixed on the upper surface of lower iron pier 6, lower main pole 9 upper surface installs circular pole plate 11 again, and circular grading ring 12 is installed in pole plate 11 upper surface periphery.Lower iron pier 6 adopts up big and down small shape, is convenient to doctor more near main pole, and doctor is stood or is sitting in when main pole limit works, legs and feet have comfortable space.Upper main pole is fixed on the lower surface of iron pier, and Shang Tiedun, upper main pole are identical with the shape of Xia Tiedun, lower main pole respectively and be arranged symmetrically with up and down, also installs circular pole plate and grading ring below upper main pole successively.Main pole material, size are determined according to magnet field intensity and shimming scope.
As shown in Figure 1, the cast steel material that upper and lower iron pier 7,6 selects magnetic property good, the xsect size of iron pier must ensure that magnetic flux can not be saturated, the horizontal yoke in top 1, the horizontal yoke in bottom 4 and perpendicular yoke 2 also adopt the good cast steel material of magnetic property to make, and in magnetic loop, the design of yoke xsect size must ensure that magnetic flux can not be saturated.The horizontal yoke in top 1 and upper iron pier 7 are by bolted, and the horizontal yoke in bottom 4 and lower iron pier 6 are by bolted.Main frame must ensure to sustain the attractive force between the weight of iron pier 7, upper main pole 8, top crown, upper grading ring and the later parts such as upper gradient coil, upper transmitting coil, upper shell loaded and upper lower magnetic pole safely, fasten Xia Tiedun simultaneously, and magnet monolithic stability can be kept.
As shown in Figure 4, in another embodiment of the invention, lower iron pier 6 adopts xsect to be foursquare truncated rectangular pyramids structure, less one end of xsect down yoke horizontal in bottom is connected, the larger one end of xsect is upward for installing lower main pole 9, the xsect of lower main pole is also square, installs foursquare pole plate and grading ring again above lower main pole.Accordingly, upper iron pier 7, upper main pole 8 are identical with the shape of Xia Tiedun, lower main pole respectively and be arranged symmetrically with up and down, also install foursquare pole plate and grading ring successively below upper main pole.As shown in Figure 5, when above sick bed 20 is arranged on lower main pole 9, sick bed 20 and the aggregate motion of bed board 21 between upper lower magnetic pole can ensure inspected object carry out cross shifting, 360 degree rotate.
In order to ensure that magnetic pole surrounding has enough large space, magnetic loop main frame of the present invention is sufficiently large, namely left and right is erected between the inner side of yoke and magnetic pole enough wide, enough high between inside upper bottom rail yoke, sick bed and the aggregate motion of bed board between upper and lower main pole can ensure inspected object carry out cross shifting, 360 degree rotate, doctor from any orientation near magnetic pole, and can carry out treatment activity easily between upper and lower main pole.
Claims (1)
1. 360 degree of great opening magnets for permanent-magnet type medical nuclear magnetic resonance imaging system, the main frame comprising a rectangle and two main poles (8 be relatively arranged on up and down in main frame, 9), described main frame is by the horizontal yoke in top (1), the perpendicular yoke (2) of the horizontal yoke in bottom (4) and the left and right sides is formed, it is characterized in that, the centre position, bottom surface on the horizontal yoke in described top (1) is fixed with Shang Tiedun (7), the end face centre position of the horizontal yoke in described bottom (4) is fixed with Xia Tiedun (6), described main pole (8, 9) be separately fixed on Shang Tiedun (7) and lower iron pier (6), in described two main poles (8, 9) relative surface is also fixed with respectively pole plate (11) and grading ring (12), the end face on the horizontal yoke in described top (1) is provided with reinforcement (10), distance (L) between described two perpendicular yoke (2) inner sides is greater than described main pole (8, 9) twice of full-size (D) in left-right direction, described main frame is embedded between the screen layer (32) of a shielding house and internal decorative layer (33), only have two main poles (8, 9) and in part, lower iron pier is exposed to the central authorities of shielding house, the xsect of described lower iron pier (6) lower end is less than the xsect of upper end, also be provided with sick bed (20), described sick bed (20) is installed on the top of the main pole (9) be fixed on Xia Tiedun (6), sick bed (20) and bed board (21) are in described two main poles (8, 9) cross shifting and 360 ° of rotations can be carried out between,
The bight that horizontal yoke (1) two ends, described top are connected with two perpendicular yokes (2) is provided with and reinforces triangle (5);
Before and after the horizontal yoke in described bottom (4), two sides are fixed with feet (3);
The horizontal yoke in described top (1), the horizontal yoke in bottom (4), Shang Tiedun (7) and lower iron pier (6) are made by the cast steel material that magnetic property is good;
Be connected by bolted between the horizontal yoke in described top (1) with upper iron pier (7);
Be connected by bolted between the horizontal yoke in described bottom (4) with lower iron pier (6);
Described upper iron pier (7) is identical with the shape of lower iron pier (6) and be arranged symmetrically with up and down, and the xsect of described upper iron pier (7) and lower iron pier (6) is circular;
Described upper iron pier (7) is identical with the shape of lower iron pier (6) and be arranged symmetrically with up and down, and the xsect of described upper iron pier (7) and lower iron pier (6) is square;
In use, doctor near main pole, and can carry out treatment activity to described magnet between upper lower magnetic pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110064702.2A CN102680925B (en) | 2011-03-17 | 2011-03-17 | 360-degree-open magnet for permanent magnet type medical magnetic resonance imaging system |
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| CN201110064702.2A CN102680925B (en) | 2011-03-17 | 2011-03-17 | 360-degree-open magnet for permanent magnet type medical magnetic resonance imaging system |
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| CN102680925B true CN102680925B (en) | 2015-04-08 |
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| CN104051122B (en) * | 2014-06-12 | 2016-08-24 | 包头市稀宝博为医疗***有限公司 | Magnet apparatus and measurement apparatus thereof for magnetic resonance imaging |
| CN108969911B (en) * | 2018-07-25 | 2020-11-17 | 宋世鹏 | MRI radiotherapy system with double-layer magnetizer |
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| CN2404130Y (en) * | 1999-12-01 | 2000-11-01 | 深圳市万济高科技产业投资发展有限公司 | Magnet apparatus using for magnetic resonance imaging system |
| JP2002253529A (en) * | 2001-03-02 | 2002-09-10 | Hitachi Medical Corp | Magnetic resonance imaging system |
| CN101086524A (en) * | 2006-06-08 | 2007-12-12 | 通用电气公司 | Method for disassembling a magnetic field generator |
| CN101191828A (en) * | 2006-11-22 | 2008-06-04 | 北京万东医疗装备股份有限公司 | Full-open permanent magnetism magnetic body for magnetic resonance image-forming |
| CN202025595U (en) * | 2011-03-17 | 2011-11-02 | 上海爱立峰医疗科技有限公司 | 360-degree large open magnet for permanent magnetism type medical magnetic resonance imaging systems |
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- 2011-03-17 CN CN201110064702.2A patent/CN102680925B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2404130Y (en) * | 1999-12-01 | 2000-11-01 | 深圳市万济高科技产业投资发展有限公司 | Magnet apparatus using for magnetic resonance imaging system |
| JP2002253529A (en) * | 2001-03-02 | 2002-09-10 | Hitachi Medical Corp | Magnetic resonance imaging system |
| CN101086524A (en) * | 2006-06-08 | 2007-12-12 | 通用电气公司 | Method for disassembling a magnetic field generator |
| CN101191828A (en) * | 2006-11-22 | 2008-06-04 | 北京万东医疗装备股份有限公司 | Full-open permanent magnetism magnetic body for magnetic resonance image-forming |
| CN202025595U (en) * | 2011-03-17 | 2011-11-02 | 上海爱立峰医疗科技有限公司 | 360-degree large open magnet for permanent magnetism type medical magnetic resonance imaging systems |
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Effective date of registration: 20171113 Address after: 201318, No. 2, building 3377, Kang Xin Road, Shanghai, Pudong New Area Patentee after: Shanghai Ailifeng Medical Technology Co.,Ltd. Address before: 201318, No. 2, building 3377, Kang Xin Road, Shanghai, Pudong New Area Co-patentee before: Xu Jianyi Patentee before: Shanghai Ailifeng Medical Technology Co.,Ltd. Co-patentee before: Zheng Jie |
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