CN2768019Y - Foot/knee associated RF winding device for magnetic resonance image system - Google Patents
Foot/knee associated RF winding device for magnetic resonance image system Download PDFInfo
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- CN2768019Y CN2768019Y CN 200420114709 CN200420114709U CN2768019Y CN 2768019 Y CN2768019 Y CN 2768019Y CN 200420114709 CN200420114709 CN 200420114709 CN 200420114709 U CN200420114709 U CN 200420114709U CN 2768019 Y CN2768019 Y CN 2768019Y
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- coil
- saddle
- toroid winding
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Abstract
The utility model relates to an RF winding device of a magnetic resonance imaging system (MRI) for detecting the lower body part of a human body, which is composed of a base component (10) and an upper part component (20), and the two components form detachable connection. Moreover, a saddle-shaped coil winding (40) and an annular winding (5) are arranged in the base component (10) and the upper part component (20). The utility model has a first scheme that the middle position of the top of the upper part component (20) is provided with an opening (21), the upper part (41) of the saddle-shaped coil winding is provided with a bulge (25) along the opening (21), and the upper part (51) of the annular winding is provided with a bulge (26) along the opening (21). Moreover, the utility model has a second scheme that the device is not provided with the opening (21). The two schemes share one base. The first scheme of the utility model carries out clear MRI to the foot part of the human body, and the second scheme carries out relatively uniform MRI to the knee part of the human body. At the same time, one end of the internal diameter of the cylindrical cavity (22) of the winding device is big, and the other end is small; the arrangement is fitted with the physiological characteristics of the human body, the cavity can be sufficiently clung to the human body, the arrangement is favorable for increasing filling factors, and thus signal-noise ratio is increased.
Description
Technical field
The utility model relates generally to the nuclear magnetic resonance image system.Particularly, the utility model relates to the radio-frequency coil that uses in the nuclear magnetic resonance image system.
Background technology
Magnetic resonance imaging system (MRI) adopts the uniform strong magnetic field of autonomous magnetic system (to be called the main field-B of MRI system
0) spin polarizes to the hydrogen nuclei in the human body.Magnetic polarization nuclear spin produces magnetic moment i in human body.This magnetic moment points to the main field direction when stable state, if do not encourage disturbance then can not produce Useful Information.
(be called and excite magnetic field or B by uniform radio frequency (RF) magnetic field
1Magnetic field) excite magnetic moment to produce nuclear magnetic resonance (NMR) signal, thereby obtain magnetic resonance imaging system (MRI) data.Radio-frequency sending coil produces B at the image-region of required detection
1Magnetic field, this radio-frequency sending coil is driven by the computer-controlled radiofrequency launcher that is subjected to that adopts power amplifier.In excitation process, the nuclear spin system absorbs magnetic energy, makes magnetic moment around the precession of main field direction.After exciting, the magnetic moment of precession will experience free induction decay (FID), discharge the energy of its absorption and return stable state.In free induction decay (FID), use to be placed near the received RF coil that human body is excited the part and to survey nuclear magnetic resonance (NMR) signal.This nuclear magnetic resonance (NMR) signal is second voltage (or electric current) that is in the received RF coil, and this voltage (or electric current) is induced by the precession magnetic moment of tissue.The received RF coil can be that transmitting coil itself also can be the absolute coil that receives only radiofrequency signal.Produce the extra-pulse gradient magnetic by the gradient coil that is integrated in the main field system, optionally excite the interior atomic nucleus of voxel of required position, and can carry out frequency coding and phase encoding to signal, thereby determine its volume coordinate, final through Fourier transform, set up a complete magnetic resonance imaging.
In magnetic resonance imaging system (MRI), the homogeneity in the magnetic field that transmitting coil and receiving coil produced is a key factor that obtains high quality graphic.In the magnetic resonance imaging system of standard, adopt whole-body radio frequency coil to obtain best exciting field homogeneity usually for emission.Whole-body radio frequency coil is a radio-frequency coil maximum in the system.But, if use bigger coil to receive simultaneously, then can produce lower signal to noise ratio (snr), this mainly is because the signal generation tissue distance of such coil and imaging is far away.Because in magnetic resonance imaging system (MRI), the most important thing is high s/n ratio (SNR), receive to improve the signal to noise ratio (snr) of required probe portion so adopt special-purpose coil to carry out radio frequency.But, because the shape of each physiological location of human body has nothing in common with each other, very irregular again, and size also difference is very big, so how according to the physiological structure characteristics at each position of human body, arrange coil circuit dexterously, be coil design personnel's maximum task in the world thereby obtain comparatively uniformly Distribution of Magnetic Field and bigger detection sensitivity always.
In practicality, design preferable special-purpose radio-frequency coil and should have following function: high s/n ratio, good homogeneity, the high-altitude charge material amount factor (Q) of resonant circuit.In addition, coil device must be designed to be suitable for patient's operation and have comfort level, and provides the protection barrier between patient and radio frequency electric equipment.A kind of method that improves signal to noise ratio (snr) is that quadrature receives.In this method, by two of the same area that covers required detection mutually independently coil survey two signals.The radiofrequency signal signal to noise ratio (S/N ratio) factor that adopts quadrature to receive is a signal when adopting single linearity coil situation
Doubly.Another method that improves signal to noise ratio (S/N ratio) is the phased-array coil technology.For imaging is carried out in a bigger zone, if use single bigger coil, the noise of the All Ranges that coil covered all enters coil, so poor signal to noise.If the use phased-array technique uses a plurality of independently small coils to cover this zone together, just can enter coil owing to only close on the noise of the very zonule of coil, therefore can improve signal to noise ratio (S/N ratio) effectively.
In medical practice, the detecting coil commonly used that human body lower limbs is partly carried out magnetic resonance imaging is payment to a porter circle and knee coil, owing to cost an arm and a leg, some manufacturers have designed the shared coil of pin/knee, in order to carry out imaging to foot, the chimney opening must be arranged at the top of coil, but this opening will influence the homogeneity in the magnetic field in the cylindrical cavity (22), thereby influences the imaging at knee position; In order to reduce this influence, the position with the chimney opening is located at the place that keeps to the side usually, but unfavorable to foot's imaging so again.In addition, the cavity of at present usually used knee coil is uniform cylindrical shape, and promptly the size of both ends open is the same, but like this and do not meet the architectural feature of human leg portion, can not reach best fill factor, curve factor, influences image quality.
The utility model content
In order to make the leg coils device promptly can produce uniform magnetic field to the human knee position again to the human foot, carry out clearly imaging, the utility model provides a kind of combined type pin/knee associating coil device.This coil device is formed detachable connection by base component (10) and upper component (20).The both sides of described base component (10) are provided with link slot, are provided with the bottom (42) of saddle-type coil (40), the bottom (52) of toroid winding (50) in base component (10).Described upper component (20) is arranged on the top of base component (10), is provided with the top (41) of saddle-type coil (40), the top (51) of toroid winding (50) in upper component (20).
In the first string of the present utility model, be provided with opening (21) in the crown center position of upper component (20), and described saddle-type coil top (41) holds described opening (21) thereby forms projection (25), and described toroid winding top (51) holds described opening (21) thereby forms projection (26).
In second scheme of the present utility model, opening (21) is not set at upper component (20) top.
In the first string and second scheme, the internal diameter homogeneous end of upper component of coil device (20) and the formed cylindrical cavity of base component (10) (22) is big, one end is little, the physiological characteristic that meets human body ankle position and knee position like this, thereby have higher fill factor, curve factor, improve signal to noise ratio (S/N ratio).
Adopt such design, the first string of the present utility model can be used for the human foot is carried out clearly magnetic resonance imaging, and second scheme can be used for the knee portions of leg regions of human body is carried out magnetic resonance imaging, therefore, can under the situation of a pedestal (10), only need to change upper component (20), just can produce preferable uniform magnetic field in the knee and the foot of human body, improve image quality, simultaneously manufacturing cost is greatly descended.
Description of drawings
Fig. 1 a is the stereographic map according to the coil device of first embodiment of the present utility model.
Fig. 1 b is the front view according to the coil device of first embodiment of the present utility model.
Fig. 1 c is the left view according to the coil device of first embodiment of the present utility model.
Fig. 1 d is the vertical view according to the coil device of first embodiment of the present utility model.
Fig. 2 a is the stereographic map according to the coil device of second embodiment of the present utility model.
Fig. 2 b is the front view according to the coil device of second embodiment of the present utility model.
Fig. 2 c is the left view according to the coil device of second embodiment of the present utility model.
Fig. 2 d is the vertical view according to the coil device of second embodiment of the present utility model.
Fig. 3 is the synoptic diagram of the cylindrical cavity (22) according to coil device of the present utility model.
Fig. 4 is the coil wiring diagram according to the coil device of first embodiment of the present utility model.
Fig. 5 is the coil wiring diagram according to the coil device of second embodiment of the present utility model.
Embodiment
What represent among the figure as shown in Figure 1a, is stereographic map according to the coil device of first embodiment of the utility model.Described coil device is made up of base component (10) and upper component (20), and base component (10) and upper component (20) mold respectively connect in the buckle mode.In this embodiment, be provided with chimney opening (21) in the crown center position of upper component (20), this is to finish the magnetic resonance imaging of foot for the foot that can make patient stretches out.With reference to figure 1b, Fig. 1 b is the front view according to the coil device of first embodiment of the present utility model.The coil device middle part of being made up of base component (10) and upper component (20) is a cylindrical cavity (22), and patient foot is stretched into.With reference to figure 1c, this is the left view of coil device again, and patient's pin stretches into from the opening of the cylindrical cavity (22) of coil device one side, stretches out from top chimney opening (21).Fig. 1 d is the vertical view of coil device, has more clearly expressed the open top (21) of the upper component (20) that is used to patient foot is stretched out in the drawings.Adopt this embodiment, because open top (21) is arranged on the centre position of coil top, therefore the magnetic field that forms is comparatively even, can carry out preferably imaging to foot.
Fig. 2 a is the schematic perspective view according to the coil device of second embodiment of the present utility model.In this device, coil device is also formed and is connected in the buckle mode by base component (10) and upper component (20).Compare with first embodiment of the present utility model, its base component (10) is identical, and unique difference is that the opening (21) at upper component (20) top has been cancelled.Like this, upper component (20) is the hemicycle tubulose, after the combination of itself and base component (10), patient's knee position can be contained in the middle of the formed cylindrical cavity (22), coil circuit is surrounded on the wall of cylindrical cavity, thereby produce uniform magnetic field, can carry out preferable magnetic resonance imaging knee.Fig. 2 b, 2c and 2d are respectively front elevation, left view and the top views of second embodiment of this coil device.Patient's shank stretches into from an end opening of the cylindrical cavity (22) of coil device, stretches out from other end opening, thus, patient's knee position fully can be contained in wherein according to the coil device of second embodiment of the present utility model.
Because the thickness difference at each position of shank of human body, therefore also to be designed to an end big for the internal diameter of the cylindrical cavity (22) of coil device, one end is little, as shown in Figure 3, so not only meet human body shank resemblance, patient uses pleasant, and because coil circuit itself also is to stick on the wall of this cavity (22), therefore can improve fill factor, curve factor effectively, thereby improve signal to noise ratio (S/N ratio).
Fig. 4 is the coil circuit synoptic diagram of first embodiment of described coil device.What solid line was represented among Fig. 4 is exactly saddle-type coil, i.e. 8 font saddle coils, and the point of crossing of its 8 word is in the center of base component (10) base.Coil sticks on the wall of cylindrical cavity (22).Coil circuit is since the point of crossing of 8 words, along cylindrical cavity (22) bottom along cylindrical cavity (22) axis direction cabling left, behind the edge that arrives cylindrical cavity (22), along cylindrical cavity (22) edge to extend upward along camber line, after arriving the top of cylindrical cavity (22), be folded to right-hand again, axis direction along cylindrical cavity (22) extends to the cavity middle part, after running into the opening (21) that is positioned at the middle part, along extending on opening (21) wall, after reaching the edge of opening (21), extend to the right along arc again, begin downwards after walking around opening (21), continue then to extend along the axis direction of cylindrical cavity (22), behind the edge on the right side of arrival cylindrical cavity (22), edge along cylinder is downward along camber line, after arriving the bottom, return the point of crossing of 8 words, but do not join with its starting point, but continuation is extended to the opposite side of the cavity of coil device (10), connect up at opposite side with symmetrical manner, return the point of crossing of 8 words at last, thereby form a complete loop.
Among Fig. 4, what line was represented is the coil that goes in ring, it is basically around chamber (22) one week of body, just rise to the edge of opening place along perforated wall in open top (21), get around mouthful edge ring and behind half cycle, arrive cylindrical cavity (22) downwards, continue then finally to form complete loops along cavity circumference cabling.
Among Fig. 4, what dotted line was represented is the separatrix of the base component and the upper component of coil device, toroid winding (40) in upper component part (41) and the part (42) in the base component link together by the binding post of the spring that is arranged in the link slot.Similarly, saddle-type coil (50) in upper component part (51) and the part (52) in the base component also link together by the binding post of the spring that is arranged in the link slot.
According to the wire laying mode among Fig. 4 and simple analysis as can be known, according to the definition of coordinate direction among Fig. 4, the magnetic direction that saddle-type coil (40) produces is the Y direction, and the magnetic direction that the coil (50) that goes in ring produces is a directions X.According to the principle of reciprocity of electromagnetic theory, saddle-type coil is surveyed the alternating magnetic field signal of Y direction as can be known, and toroid winding is surveyed the alternating magnetic field signal of directions X.Because this coil is mainly used in the perpendicualr field system, so static magnetic field B
0Along the Z direction.These two coils can be combined to form quadrature coil or phased-array coil, can survey perpendicular to all NMR signal in the static magnetic field direction plane.And because open top (21) also has coil circuit all around, coil is also very sensitive to signal herein, therefore can carry out magnetic resonance imaging to whole foot.
Fig. 5 is the coil wiring diagram according to the coil device of second embodiment of the utility model.As can be seen, compare with Fig. 4, basic wire laying mode is the same, just owing to there is not open top (21), therefore coil circuit does not extend upward, so just make the magnetic field in the cylindrical cavity (22) have better homogeneity, thereby can carry out better imaging other position of knee position or human body shank.
First embodiment of the present utility model can be used for the human foot is carried out clearly magnetic resonance imaging, and second embodiment can be used for the knee portions of leg regions of human body is carried out magnetic resonance imaging, by embodiment of the present utility model, can produce preferable uniform magnetic field at two key positions of human body lower limbs, improve image quality, simultaneously manufacturing cost is greatly descended.
Though quote certain embodiments and application thereof here utility model disclosed herein has been described, but those of ordinary skills can make various corrections and variation to these embodiment under the situation of the described spirit and scope of the present utility model of claim.
Claims (7)
1. pin/the knee that is used for the nuclear magnetic resonance image system is united coil device, and described coil device comprises:
Base component (10), be provided with link slot (11) and (12) in the both sides of described base component (10), in described base component (10), be provided with the saddle-type coil bottom (42) of saddle-type coil (40), the toroid winding bottom (52) of toroid winding (50)
Upper component (20), it is arranged on the top of described base component (10), is provided with the saddle-type coil top (41) of saddle-type coil (40), the toroid winding top (51) of toroid winding (50) in described upper component (20),
Described base component (10) and described upper component (20) surround a cylindrical cavity (22), both ends open;
It is characterized in that:
Described base component (10) and described upper component (20) mold respectively removably connect;
Described saddle-type coil (40) is 8 font saddle coils, two rings of described 8 font saddle coils lay respectively at the left side and the right side of described cylindrical cavity (22), removably connect by the binding post of the spring in described link slot (11) (12), (21) (22) in described base component saddle-type coil bottom (42) with on the described saddle-type coil top (41) of described upper component (20);
Described toroid winding (50) is a toroid winding, to the cavity setting, described toroid winding bottom (52) removably connects by the binding post of the spring in described link slot (11) (12), (21) (22) with described toroid winding top (51) described toroid winding around cylinder.
2. coil device as claimed in claim 1 is characterized in that, described saddle-type coil and described toroid winding (50) formation quadrature coil capable of being combined or phased-array coil.
3. coil device as claimed in claim 1 is characterized in that, the crown center position of described upper component (20) also is provided with chimney opening (21) and described cylindrical cavity (22) fuses.
4. coil device as claimed in claim 3, it is characterized in that, described saddle-type coil top (41) holds described opening (21), thereby form described saddle-type coil bossing (25), described toroid winding top (51) holds described opening (21), thereby forms described toroid winding bossing (26).
5. coil device as claimed in claim 1 is characterized in that, described base component (10) is that bayonet socket is connected with described upper component (20).
6. coil device as claimed in claim 1 is characterized in that, described base component (10) is hinged with described upper component (20).
7. coil device as claimed in claim 1 is characterized in that, internal diameter one end of described cylindrical cavity (22) is big, and an end is little.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420114709 CN2768019Y (en) | 2004-12-24 | 2004-12-24 | Foot/knee associated RF winding device for magnetic resonance image system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420114709 CN2768019Y (en) | 2004-12-24 | 2004-12-24 | Foot/knee associated RF winding device for magnetic resonance image system |
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| Publication Number | Publication Date |
|---|---|
| CN2768019Y true CN2768019Y (en) | 2006-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420114709 Expired - Lifetime CN2768019Y (en) | 2004-12-24 | 2004-12-24 | Foot/knee associated RF winding device for magnetic resonance image system |
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| CN (1) | CN2768019Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403788B (en) * | 2008-10-31 | 2011-03-23 | 深圳市特深电气有限公司 | Nuclear magnetic resonance receiving coil |
| CN102288928A (en) * | 2011-08-03 | 2011-12-21 | 深圳市特深电气有限公司 | Radio frequency coil device for magnetic resonance imaging system |
| CN102824174A (en) * | 2011-06-14 | 2012-12-19 | 上海辰光医疗科技股份有限公司 | Infant body heart coil device for magnetic resonance imaging system |
| CN103543419A (en) * | 2012-07-09 | 2014-01-29 | 上海联影医疗科技有限公司 | Knee coil |
| CN104569879A (en) * | 2015-01-12 | 2015-04-29 | 上海联影医疗科技有限公司 | Ankle coil assembly and use method thereof |
| CN105044633A (en) * | 2014-04-25 | 2015-11-11 | 西门子公司 | Knee coil |
| CN105487029A (en) * | 2015-12-23 | 2016-04-13 | 深圳市特深电气有限公司 | Multichannel radio frequency coil device for NMR imaging system |
| CN106546933A (en) * | 2015-09-17 | 2017-03-29 | 上海联影医疗科技有限公司 | A kind of radio frequency coil assemblies for nuclear magnetic resonance |
| CN108107387A (en) * | 2017-12-28 | 2018-06-01 | 江阴万康医疗科技有限公司 | Multi-channel magnetic resonance knee joint shares imaging coil with ankle foot |
| CN112763953A (en) * | 2020-12-10 | 2021-05-07 | 复旦大学 | Multipurpose radio frequency coil device for head/knee joint based on 7.0T magnetic resonance imaging system |
-
2004
- 2004-12-24 CN CN 200420114709 patent/CN2768019Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403788B (en) * | 2008-10-31 | 2011-03-23 | 深圳市特深电气有限公司 | Nuclear magnetic resonance receiving coil |
| CN102824174A (en) * | 2011-06-14 | 2012-12-19 | 上海辰光医疗科技股份有限公司 | Infant body heart coil device for magnetic resonance imaging system |
| CN102288928A (en) * | 2011-08-03 | 2011-12-21 | 深圳市特深电气有限公司 | Radio frequency coil device for magnetic resonance imaging system |
| CN103543419B (en) * | 2012-07-09 | 2015-05-20 | 上海联影医疗科技有限公司 | Knee coil |
| CN103543419A (en) * | 2012-07-09 | 2014-01-29 | 上海联影医疗科技有限公司 | Knee coil |
| CN105044633A (en) * | 2014-04-25 | 2015-11-11 | 西门子公司 | Knee coil |
| CN105044633B (en) * | 2014-04-25 | 2020-12-25 | 西门子公司 | Knee coil |
| CN104569879A (en) * | 2015-01-12 | 2015-04-29 | 上海联影医疗科技有限公司 | Ankle coil assembly and use method thereof |
| CN106546933A (en) * | 2015-09-17 | 2017-03-29 | 上海联影医疗科技有限公司 | A kind of radio frequency coil assemblies for nuclear magnetic resonance |
| US10684333B2 (en) | 2015-09-17 | 2020-06-16 | Shanghai United Imaging Healthcare Co., Ltd. | Device for connecting cable and RF coil assembly |
| CN105487029A (en) * | 2015-12-23 | 2016-04-13 | 深圳市特深电气有限公司 | Multichannel radio frequency coil device for NMR imaging system |
| CN108107387A (en) * | 2017-12-28 | 2018-06-01 | 江阴万康医疗科技有限公司 | Multi-channel magnetic resonance knee joint shares imaging coil with ankle foot |
| CN112763953A (en) * | 2020-12-10 | 2021-05-07 | 复旦大学 | Multipurpose radio frequency coil device for head/knee joint based on 7.0T magnetic resonance imaging system |
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| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI CHENGUANG MEDICAL TECHNOLOGIES CO., LTD. Free format text: FORMER NAME: CHENGUANG MEDICAL SCIENCE AND TECHNOLOGY CO., LTD., SHANGHAI |
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| CP01 | Change in the name or title of a patent holder |
Address after: 200233, No. 2, building 398, Shanghai, Tianlin Road, 6A Patentee after: Shanghai Chengguang Medical Technologies Co.,Ltd. Address before: 200233, No. 2, building 398, Shanghai, Tianlin Road, 6A Patentee before: Shanghai Chenguang Medical Technology Co., Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 201107, building 8, 1199 lane, Ji Qu Road, Shanghai, Minhang District Patentee after: Shanghai Chengguang Medical Technologies Co.,Ltd. Address before: 200233, No. 2, building 398, Shanghai, Tianlin Road, 6A Patentee before: Shanghai Chengguang Medical Technologies Co.,Ltd. |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141224 Granted publication date: 20060329 |