CN102680925A - 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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- CN102680925A CN102680925A CN2011100647022A CN201110064702A CN102680925A CN 102680925 A CN102680925 A CN 102680925A CN 2011100647022 A CN2011100647022 A CN 2011100647022A CN 201110064702 A CN201110064702 A CN 201110064702A CN 102680925 A CN102680925 A CN 102680925A
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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 magnet structure of permanent-magnet type medical magnetic resonance imaging system.
Background technology
Nineteen forty-six, the Purcell of Harvard University and the Bloch of Stanford University have 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's is to the continuous development of magnetic resonance applications research, finally last century early eighties successfully released the commodity machine that is used for people's volume imaging, for the human body medical diagnosis provides advanced technology means.
The medical magnetic resonance imaging system mainly is made up of major parts such as magnet system, spectrometer system, gradient system, radio-frequency transmissions and receiving system, computer system (comprising interface, application software, scanning sequence), shielding houses.Magnet is that magnetic resonance system provides a constant magnetic field, and its each item index (like field intensity, uniformity coefficient, degree of stability, peripheral openness, last lower magnetic pole clear space etc.) has directly determined the convenience of image quality and use.And the characteristic of magnet is used to divide the classification of magnetic resonance system, as being divided into the superconduct system by magnet manufactured materials characteristic, often leading type system, permanent-magnet type system; Field intensity characteristic by magnet can be divided into low field system, middle field system, high field system; Can be divided into open and the non-open type system by the magnet configurations characteristic.
Current open magnet is C type or twin columns type mostly; Generous C type back or thick twin columns have sheltered from the open visual field largely; Sick bed can't be realized the rotation of large-scale translation and wide-angle; The shielding house that therefore the medical magnetic resonance imaging system is installed at present only can be used for image-forming diagnose, and the doctor can't carry out the treatment activity expediently between last lower magnetic pole.
A kind of full-open permanent magnetism magnetic body for magnetic resonance image-forming is just disclosed such as Chinese invention patent CN101191828B; This permanent-magnet comprise by two vertical yokes that are symmetrically arranged and two up and down the horizontal yoke of symmetric arrangement being of constituting flat wide hollow structure the full open model main structure, the air gap district of this permanent-magnet is positioned at the middle part of said full open model main structure; Two parallel relative main poles are positioned at up and down two horizontal yokes near air gap district one side and link together with two horizontal yokes up and down respectively up and down; Two main poles were near air gap district one side and link together with two main poles up and down respectively about two groups of parallel relative last bottom crown groups were positioned at up and down; Wherein, this full open model main structure sees from the front and is flat wide hollow, two parallel positioned opposite of horizontal yoke up and down, about two parallel positioned opposite of vertical yoke; Two horizontal yokes are left-right symmetric, front and back symmetry and laterally zygomorphic structure, and stepped construction is adopted in outside of two far-ends about it; See from the front; Laterally the yoke right ends becomes stepped away from a side of vertical yoke; The ladder number is three to four, and the thickness of each ladder is 1/4th to 1/3rd of horizontal yoke gross thickness, and the length of each ladder is a thirtieth to 1/15th of horizontal yoke total length.Two horizontal yoke center sections have been removed the part material away from a side of main pole, and the horizontal yoke behind the removal material still keeps left-right symmetric, front and back symmetrical structure; See from the front, do not consider the staircase structure of horizontal yoke two far-ends, laterally the center section thickness of yoke is minimum; For total thickness 1/3rd to 2/3rds between; To two far-ends, its thickness increases gradually, until equating with total thickness from the center section of horizontal yoke; The center section of horizontal yoke behind the said removal material connects horizontal yoke on its fore-and-aft direction, on left and right directions, be of a size of 2/3rds of main pole external diameter.
This patent CN101191828B makes magnetic flux inner concentrated to yoke through getting on except that the mode of material at horizontal yoke, and has alleviated the general assembly (TW) of yoke.But obviously; Distance in this structure between main pole and the vertical yoke can not be very big; Can not provide enough spaces to supply the doctor that patient is cured activity,, will certainly increase the distortion of upper lateral yoke if increase the distance between main pole and the vertical yoke; Particularly laterally the position of yoke mid-mounting main pole can produce tangible distortion and vibration; Add the middle part of horizontal yoke and removed material again, further weakened the rigidity of horizontal yoke, can't guarantee the stability of magnet.Therefore, this structure is only applicable in the less system of magnet horizontal span the space that treats a patient to be provided.
Summary of the invention
The technical matters that the present invention will solve provides a kind of permanent-magnet type magnet of real 360 degree great openings; There is not any blocking on this magnet around the lower magnetic pole; And enough big space is arranged; The aggregate motion between last lower magnetic pole of sick bed and bed board can ensure that inspected object carries out in length and breadth moving, 360 degree rotations, and the doctor can be from any orientation near magnetic pole, and between last lower magnetic pole, cures activity easily.
In order to solve the problems of the technologies described above; The present invention adopts following technical scheme: a kind of 360 degree great opening magnets that are used for permanent-magnet type medical magnetic resonance imaging system; Comprise the main frame of a rectangle and relatively be installed in two main poles in the main frame up and down; Said main frame is made up of the perpendicular yoke of the horizontal yoke in top, the horizontal yoke in bottom and the left and right sides; The centre position, bottom surface of the horizontal yoke in said top is fixed with Shang Tiedun, and the end face centre position of the horizontal yoke in said bottom is fixed with Xia Tiedun, and said main pole is separately fixed on Shang Tiedun and the following iron pier; The end face of the horizontal yoke in said top is provided with reinforcement, the distance between the said two perpendicular yoke inboards greater than said main pole along the maximum sized twice of left and right directions.
Preferably, the horizontal yoke in said top two ends are provided with the reinforcing triangle with the bight that two perpendicular yokes are connected.
Preferably, two sides are fixed with feet before and after the horizontal yoke in said bottom.
Preferably, on said two main pole facing surfaces, also be fixed with pole plate and grading ring respectively.
Preferably, the horizontal yoke in said top, the horizontal yoke in bottom, Shang Tiedun and following iron pier are processed by the good cast steel material of magnetic property.
More preferably, be connected by bolted between the horizontal yoke in said top and the last iron pier.
More preferably, be connected by bolted between the horizontal yoke in said bottom and the following iron pier.
Preferably, the xsect of said Tie Dun lower end down is less than the xsect of upper end.
More preferably, the identical and symmetric arrangement up and down of the shape of said Shang Tiedun and following iron pier, the xsect of said Shang Tiedun and following iron pier is a circle.
More preferably, the identical and symmetric arrangement up and down of the shape of said Shang Tiedun and following iron pier, the xsect of said Shang Tiedun and following 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 ensured around the magnetic pole enough big space has been arranged; The aggregate motion between last lower magnetic pole of sick bed and bed board can ensure that inspected object carries out moving in length and breadth, 360 degree rotations; The doctor can be from any orientation near magnetic pole, and between last lower magnetic pole, cures activity easily.
B) the big frame type magnetic loop structure of the present invention design, up and down, left-right symmetric property is good, and the framework yoke is away from magnetic pole, for the magnet shimming provides good basis.
C) the big frame magnetic loop structure of the present invention's design because thermal inertia is big, so the drift that field intensity is caused by variation of ambient temperature is slower, has improved the stability in magnetic field.
D) end face of the horizontal yoke in top is provided with reinforcement, can good rigidity be provided for the horizontal yoke in the top of large span, under safing situation, reduces the yoke material cost.Reinforcement can reduce the vibration deformation of the horizontal yoke in top, guarantees the stability of main magnet, thereby can guarantee favorable imaging quality.
E) feet of the reinforcing trigonometric sum of upper corner bottom also can further improve the stability of system.
F) setting of Shang Tiedun and following iron pier under the situation that guarantees the main pole air gap, can increase the height space of magnet, makes horizontal yoke also away from magnetic pole, helps providing uniform magnetic field.
G) down the iron pier adopts up big and down small shape, is convenient to the doctor more near main pole, the doctor is stood or is sitting in when working on the main pole limit, and legs and feet have comfortable space.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Fig. 1 is a kind of front elevation that is used for 360 degree great opening magnets of permanent-magnet type medical magnetic resonance imaging system of the present invention.
Fig. 2 is the perspective view of great opening magnet shown in Figure 1.
Fig. 3 is the assembly relation synoptic diagram of main pole part.
Fig. 4 is the front elevation of second kind of great opening magnet of the present invention.
Fig. 5 is the perspective view of second kind of great opening magnet of the present invention.
Fig. 6 is the mounting means synoptic diagram of the present invention's 360 degree great opening magnets in shielding house.
Embodiment
Like Fig. 1, shown in Figure 2; A kind of 360 degree great opening magnets that are used for permanent-magnet type medical 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 4 in bottom 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 4 in bottom is fixed with down iron pier 6.Two main poles 8,9 of installing relatively up and down are separately fixed on iron pier 7 and the following iron pier 6.The present invention is big frame, large span magnetic loop structure; Distance between two perpendicular yoke 2 inboards greater than main pole along the maximum sized twice of left and right directions; In present embodiment; 7,6 and two magnetic poles 8,9 of iron pier are round section up and down, and the distance L between two perpendicular yoke 2 inboards is greater than the twice of main pole 8,9 maximum dimension D.When the present invention is installed in the 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, and main frame can be embedded between screen layer 32 and the internal decorative layer 33, have only up and down main pole 8,9 and part up and down the iron pier be exposed to the central authorities of shielding house; Can guarantee so all has enough spaces in the scope of 360 degree around the main pole, supplies sick bed to rotate and the medical worker carries out the treatment activity.
Continuation is 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 laterally arranges, and reinforcement 10 can improve the rigidity and the stability of the horizontal yoke 1 in top greatly under the situation that need not increase a lot of yoke material.
In addition; In order further to improve the stability of large span main frame structure; 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; It is the triangular prism structure of right-angle triangle that this reinforcing triangle 5 adopts xsects, and its two right-angle sides are fixedly connected with the horizontal yoke in top 1, perpendicular yoke 2 respectively.Two sides, horizontal yoke 4 front and back also can be fixed the feet 3 of several angle bar shapes respectively in the bottom, with the stability of further raising magnet.
As shown in Figure 3, the xsect of following 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 one section less cylinder and one section round platform of diameter, and the end diameter of round platform is identical with the diameter of cylinder and be connected.Following main pole 9 also is a round section, can be formed by the Nd-Fe-B magnet steel bonding, is fixed on down on the upper surface of iron pier 6, and following main pole 9 upper surfaces are installed circular pole plate 11 again, the peripheral grading ring 12 that circle is installed of pole plate 11 upper surfaces.Following iron pier 6 adopts up big and down small shape, is convenient to the doctor more near main pole, the doctor is stood or is sitting in when working on the main pole limit, and legs and feet have comfortable space.Last main pole is fixed on the lower surface of iron pier, Shang Tiedun, go up main pole respectively with Xia Tiedun, the identical and symmetric arrangement up and down of the shape of main pole down, the following pole plate and the grading ring that circle also is installed successively of last main pole.Main pole material, size are decided according to magnet field intensity and shimming scope.
As shown in Figure 1; Upper and lower iron pier 7,6 is selected the good cast steel material of magnetic property for use; The xsect size of iron pier must ensure that magnetic flux can be unsaturated; The horizontal yoke in top 1, the horizontal yoke 4 in bottom and perpendicular yoke 2 also adopt the good cast steel material of magnetic property to process, and the design of yoke xsect size must guarantee that magnetic flux can be unsaturated in the magnetic loop.Horizontal yoke 1 in top and last iron pier 7 are by bolted, and horizontal yoke 4 in bottom and following iron pier 6 are by bolted.Main frame must guarantee to sustain safely iron pier 7, goes up main pole 8, top crown, go up grading ring and the last gradient coil that loads later on, go up transmitting coil, the upward weight of parts such as shell and the attractive force between last lower magnetic pole; Fasten Xia Tiedun simultaneously, and can keep the magnet monolithic stability.
As shown in Figure 4; In another embodiment of the present invention; It is foursquare truncated rectangular pyramids structure that following iron pier 6 adopts xsect, and the less end of xsect is connected with the horizontal yoke in bottom down, and the end that xsect is bigger is used to install down main pole 9 up; The xsect of following main pole also is a square, following foursquare pole plate and the grading ring installed again above the main pole.Accordingly, last iron pier 7, go up main pole 8 respectively with Xia Tiedun, the identical and symmetric arrangement up and down of the shape of main pole down, the following foursquare pole plate and the grading ring also installed successively of last main pole.As shown in Figure 5, when sick bed 20 was installed in down main pole 9 tops, sick bed 20 and the aggregate motion of bed board 21 between last lower magnetic pole can ensure that inspected object carries out moving in length and breadth, 360 degree rotations.
In order to guarantee around the magnetic pole enough big space is arranged; Magnetic loop main frame of the present invention must be enough big; Enough wide between the inboard of perpendicular yoke and the magnetic pole promptly, enough high between the horizontal up and down yoke inboard, sick bed and bed board can ensure that in the aggregate motion between main pole up and down inspected object carries out moving in length and breadth, 360 spends and rotate; The doctor can be from any orientation near magnetic pole, and is curing activity easily between main pole up and down.
Claims (10)
1. 360 degree great opening magnets that are used for permanent-magnet type medical magnetic resonance imaging system; Comprise the main frame of a rectangle and relatively be installed in two main poles (8,9) in the main frame up and down; Said 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; It is characterized in that; The centre position, bottom surface of the horizontal yoke in said top (1) is fixed with Shang Tiedun (7), and the end face centre position of the horizontal yoke in said bottom (4) is fixed with Xia Tiedun (6), and said main pole (8,9) is separately fixed on Shang Tiedun (7) and the following iron pier (6); The end face of the horizontal yoke in said top (1) is provided with reinforcement (10), and the distance (L) between said two perpendicular yoke (2) inboards is greater than the twice of said main pole (8,9) along left and right directions full-size (D).
2. great opening magnet according to claim 1 is characterized in that, the bight that the horizontal yoke in said top (1) two ends are connected with two perpendicular yokes (2) is provided with and reinforces triangle (5).
3. great opening magnet according to claim 1 is characterized in that, two sides are fixed with feet (3) before and after the horizontal yoke in said bottom (4).
4. great opening magnet according to claim 1 is characterized in that, on said two main poles (8,9) facing surfaces, also is fixed with pole plate (11) and grading ring (12) respectively.
5. great opening magnet according to claim 1 is characterized in that, the horizontal yoke in said top (1), the horizontal yoke in bottom (4), Shang Tiedun (7) and following iron pier (6) are processed by the good cast steel material of magnetic property.
6. great opening magnet according to claim 5 is characterized in that, is connected by bolted between the horizontal yoke in said top (1) and the last iron pier (7).
7. great opening magnet according to claim 5 is characterized in that, is connected by bolted between the horizontal yoke in said bottom (4) and the following iron pier (6).
8. great opening magnet according to claim 1 is characterized in that, the xsect of said iron pier (6) lower end down is less than the xsect of upper end.
9. great opening magnet according to claim 8 is characterized in that, the identical and symmetric arrangement up and down of the said shape that goes up iron pier (7) and following iron pier (6), and the xsect of said last iron pier (7) and following iron pier (6) is a circle.
10. great opening magnet according to claim 8 is characterized in that, the identical and symmetric arrangement up and down of the said shape that goes up iron pier (7) and following iron pier (6), and the xsect of said last iron pier (7) and following iron pier (6) is square.
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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 CN102680925B (en) | 2015-04-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051122A (en) * | 2014-06-12 | 2014-09-17 | 包头市稀宝博为医疗系统有限公司 | Magnet device used for magnetic resonance imaging and measuring equipment of magnet device |
| CN108969911A (en) * | 2018-07-25 | 2018-12-11 | 宋世鹏 | A kind of MRI radiotherapy system with the double-deck 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
- 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051122A (en) * | 2014-06-12 | 2014-09-17 | 包头市稀宝博为医疗系统有限公司 | Magnet device used for magnetic resonance imaging and measuring equipment of magnet device |
| CN104051122B (en) * | 2014-06-12 | 2016-08-24 | 包头市稀宝博为医疗系统有限公司 | Magnet apparatus and measurement apparatus thereof for magnetic resonance imaging |
| CN108969911A (en) * | 2018-07-25 | 2018-12-11 | 宋世鹏 | A kind of MRI radiotherapy system with the double-deck magnetizer |
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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 |