CN102288930A - Local coil and consctruction method, magnetic resonance instrument,method for measuring manetic magnetic resonance signal - Google Patents
Local coil and consctruction method, magnetic resonance instrument,method for measuring manetic magnetic resonance signal Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
- G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/365—Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/3657—Decoupling of multiple RF coils wherein the multiple RF coils do not have the same function in MR, e.g. decoupling of a transmission coil from a receive coil
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
本发明涉及一种具有磁共振天线组(2)的局部线圈(1)，磁共振天线组包括多个布置在相邻排(SR1、SR2、SR3)内的天线线匝(3、3A、3E)，彼此相邻布置的天线线匝分别通过几何重叠(UX、UZ)互相电感去耦，天线线匝排按交替错开的方向(R1、R2、R3)互相错开为，使一排中两个天线线匝的重叠区与一个相邻排中两个天线线匝的重叠区错开布置，至少一部分天线线匝设计成用于补偿错开量，使得它们改绘为不同的面积并由此使天线线匝的相邻排沿错开方向在前端和在后端基本上分别终止在横向于错开方向的直线(L1、L2)上。本发明还涉及一种有这种局部线圈的磁共振仪、一种这种局部线圈的构造方法以及磁共振信号的测量方法。
The invention relates to a local coil (1) with a magnetic resonance antenna group (2) comprising a plurality of antenna turns (3, SR3) arranged in adjacent rows ( SR1 , SR2 , SR3 ) 3A, 3E), the antenna turns arranged adjacent to each other are inductively decoupled from each other through geometric overlap (UX, UZ), and the antenna turns are staggered in alternately staggered directions (R 1 , R 2 , R 3 ), The overlapping area of two antenna turns in a row is staggered from the overlapping area of two antenna turns in an adjacent row, at least some of the antenna turns are designed to compensate for the stagger, so that they are redrawn as different areas As a result, adjacent rows of antenna turns in the stagger direction terminate substantially at the front end and at the rear end respectively on a straight line (L 1 , L 2 ) transverse to the stagger direction. The invention also relates to a magnetic resonance apparatus with such a local coil, a method for constructing such a local coil and a method for measuring magnetic resonance signals.
Description
Technical field
The present invention relates to a kind of local coil that has the magnetic resonance antenna group to be used for magnetic resonance device, the magnetic resonance antenna group comprises a plurality of antenna wire turns that are arranged in the parallel adjacent row.The invention still further relates to a kind of measuring method that building method and a kind of magnetic resonance signal of the magnetic resonance device of this local coil, a kind of local coil are arranged in addition.
Background technology
When some organ of magnetic resonance examination patient or body part,, use so-called skin antenna for receiving magnetic resonance signals (MR signal) with in case of necessity also in order to send the high-frequency signal of excitation nuclear spin necessity.These skin antennas are placed in from the organ that will check or the closer place of body part during inspection, preferably are placed directly on the patient body surface.Because they are placed near the zone of being concerned about, it is that they have bigger activity coefficient that these skin antennas are compared its advantage with the antenna that is provided with away from patient.Make the less decay of useful signal thus, and reduce fundamentally to improve so-called signal to noise ratio (S/N ratio) (SNR because therefore the noise share that the electric loss in patient body inside causes is compared with the antenna of remote setting; Signal-to-Noise-Ratio).But shortcoming is that single skin antenna can only produce effective image in bulk regulation, that be in this skin antenna wire turn diameter order of magnitude.Therefore, because the restricted range of observation of this skin antenna one by one, thereby it uses possibility very limited.Although range of observation can be by strengthening the diameter expansion of skin antenna wire turn.But along with the increase of wire turn, the electric loss in the patient body also strengthens simultaneously, and the thing followed is bigger noise.Therefore when using single skin antenna, a kind of half-way house of selection between resolution that must be high as far as possible on the one hand and the big as far as possible on the other hand observation district all the time.
A kind of possibility that increases range of observation and meanwhile do not reduce resolution with identical degree is that use the so-called local coil that a magnetic resonance antenna group is arranged, the magnetic resonance antenna group comprises a plurality of antenna wire turns that can work one by one in the adjacent row that are arranged in.
Each antenna wire turn of antenna sets is designed to the simple wire turn that its inside is provided with shortening capatcitor mostly.But also can relate to the wire turn that other types for example have many circles, relate to so-called Butterfly wire turn or relate to saddle coil.A common this local coil also has one or more prime amplifiers, leads to cable that connector can be connected with the magnetic resonance equipment receiving system by its local coil and in case of necessity at local coil enclosure or other electron devices on cable from the local coil shell except that antenna sets, for example surface wave block device etc.
In inner each antenna element of this local coil geometric configuration accurately, correspondingly at using width, that is at local coil should be used in which kind of purpose, at picture quality, SNR especially is with for by using the parallel transmission method of image might shorten Measuring Time.Not only whole here local coil, that is the size of a complete set of antenna sets, and the geometry designs of each antenna wire turn and their mutual alignment all play conclusive effect.The overall dimensions of local coil is important, because it is the key parameter of illumination.If should be with a local coil for example liver that throws light on fully, then this local coil must correspondingly be determined size along z direction (axis that is parallel to the patient tunnel) with along x direction (second horizontal direction perpendicular to the z direction in device coordinate system).The size of each antenna wire turn is important, because compare with big antenna wire turn, the less antenna wire turn lifting of SNR in its vicinity is stronger.The quantity of antenna wire turn has decisive role for the parallel transmission method of image, because this method is based on the available limited space of each antenna wire turn section.That is to say that each antenna wire turn provides the fixed position that can utilize coding simultaneously in the parallel transmission method of image in this method.Acceleration is realized by omitting the phase encoding step in the parallel transmission method of image.In order however still to generate image by the k-space of so-called " underdevelopment ", local coil must have a plurality of antenna wire turns along phase-encoding direction.Local coil is many more along the antenna wire turn of phase-encoding direction, can realize that high more acceleration factor and Measuring Time are short more.
Yet the problem that exists when using this antenna sets is that the high-frequency current in an antenna wire turn can be at an adjacent antenna wire turn internal induction voltage.This is commonly referred to the inductive coupling of antenna wire turn.Inductive coupling causes the signal of generation in one of adjacent antenna wire turn, also causes a component of signal in the adjacent antenna wire turn automatically.Therefore inductive coupling worsens signal to noise ratio (S/N ratio).In addition, to the coupling antenna wire turn signal evaluation the time the change expense also greater than not the coupling the antenna wire turn.Therefore should avoid the inductive coupling of antenna wire turn as far as possible.
The possibility of adjacent antenna wire turn decoupling is, makes the size of the overlapping regulation of adjacent antenna wire turn, makes that the inductive coupling between the adjacent antenna wire turn is minimum on the whole.
When relating in a row or delegation antenna sets inside is in directly and during the antenna wire turn of column position, it is possible that this " how much " or " inductance " decoupling do not have query.Yet the wire turn decoupling that the diagonal angle is adjacent each other in adjacent row and line has difficulties.The overlapping central area that causes of diagonal angle adjacent turns is covered simultaneously by four wire turns.This cause these the zone in undesirable signal superpower, this especially can cause pseudo-shadow.
Therefore the current skin antenna that antenna sets is arranged that uses in fact mostly, wherein, the not decoupling of wire turn that the diagonal angle is adjacent each other in antenna sets inside, but, attempt to reach as far as possible effectively decoupling therein only by distance enough between the diagonal angle adjacent antenna wire turn and by being installed in the suitable decoupling of the prime amplifier on the antenna terminal.
Another kind of decoupling possibility is to use so-called takeup type forwarder, is used for being in the antenna wire turn decoupling of adjacent or diagonal position.A part is repeatedly reeled in each antenna wire turn for this reason, and this takeup type forwarder and an adjacent coil are overlapping then.Yet this causes at the inner additional rigid region of antenna wire turn, thereby reduces the flexibility of local coil.But Rou Xing local coil is expected as far as possible, to reach best shaping the on patient body.When passing through additional discrete lines circuit component decoupling, also at the inner rigid region that adds that forms of local coil.
Summary of the invention
Therefore the technical problem to be solved in the present invention is to further develop a kind of local coil, make each antenna wire turn decoupling each other in simple mode, and however make local coil when optimizing the surround as far as possible, still can adapt to inspection object, for example patient or propositus's health neatly.
By in the local coil of the present invention, adjacent antenna wire turn in a row not only, and in adjacent row, adjoin the antenna wire turn of layout each other, divide then by how much overlapping mutual inductive coupling.That is to say that all each antenna wire turns that adjoins layout mutually are the amount of an overlapping regulation in the frontier district all.Here, these antenna wire turn row is along the direction that staggers that replaces, be parallel to vertically offsetting back and forth each other of antenna wire turn row respectively, make the overlay region of the overlay region of two antenna wire turns of a row, stagger that is the each interval layout with respect to two antenna wire turns of adjacent row.The overlay region that guarantees adjacent row in this way is not overlapping, and thereby to occur three antenna wire turns at most overlapping.However all each antenna wire turns that adjoins mutually are by the decoupling of overlapping inductance each other.For this reason, described staggering preferably undertaken by the offsetting amount corresponding to a part of antenna wire turn of a regulation.Particularly preferably be, these are arranged the half antenna wire turn ground that always staggers each other and offset.
In addition, be designed for the compensation amount of staggering by at least a portion antenna wire turn of the present invention, make they change be depicted as different areas and make thus the adjacent row of antenna wire turn along the direction that staggers at front end with on the rear end terminates in straight line transverse to the direction that staggers basically respectively.
By by this a bright design and layout that makes up each antenna wire turn in magnetic resonance antenna group inside rightly, at first reach all antenna wire turn pure inductance decouplings each other, do not need the element of the meeting restriction local coil flexibility of adding.Knotty problem discussed above, that is some zone is covered simultaneously by four antenna wire turns and can cause the superpower problem of undesirable signal in local coil, is here avoided.However can guarantee still that local coil has the simple surround of geometric configuration generally, for example a sort of rectangular illumination district of being familiar with as people meanwhile especially reaches the big as far as possible illumination with regard to the local coil external dimensions.
The geometric configuration of faying surface and being sized to makes the inductive coupling minimum between each overlapping antenna wire turn.The not only wire turn in a row, and the adjacent turns in adjoining row each other by the minimum pure inductance decoupling of this expense, also obtains the low especially structure of a kind of cost of local coil.Because do not need additional other antenna wire turn element in principle, and do not need four times of each antenna wire turn overlapping, so they can make antenna sets in the opposed both sides of printed conductor thin slice simply with common impression or etch.Only wire turn need be stamped on the different side of printed conductor thin slice piecemeal, and carry out through hole in the position of regulation and apply plating, intersect to reach between adjacent winding displacement circle.
In addition, simple structure causes the flexibility expected, however still improves mechanical stability and durability, and these have significant values in the actual use of this local coil.
Press in the building method of the present invention at this local coil, when making the antenna wire turn, when for example on the printed conductor thin slice, impressing, guaranteed all antenna wire turns are applied for, make the antenna wire turn that adjoins each other respectively by how much overlapping mutual inductive coupling, wherein these antenna wire turn row along the direction that alternately staggers stagger mutually for, make the overlay region amount of staggering of two antenna wire turns among the overlay region of two antenna wire turns among the row and the adjacent row.In addition, the antenna wire turn is designed to, make at least a portion antenna wire turn be designed for compensation and stagger, make they change be depicted as different areas and make thus the adjacent row of antenna wire turn along the direction that staggers at front end with on the rear end terminates in straight line transverse to the direction that staggers basically respectively.
This local coil can use in principle in various types of magnetic resonance devices, that is both can be used in cylindrical periphery seal in the magnetic resonance device of distolateral patient's chamber of opening, also can be used in the magnetic resonance device of patient's chamber that three sides open.Can in being arranged, use various types of magnetic resonance devices of different magnetic field intensity equally.
By magnetic resonance signal measuring method of the present invention, it is characterized in that, here adopt by local coil of the present invention.But local coil not only can be used in receiving magnetic resonance signals, and can send high-frequency signal, with the generation of excite magnetic resonances signal.
The explanation of dependent claims and other comprises particularly advantageous designs more of the present invention and further develops, and wherein, especially one type the claim claim that also can be similar to one of other types further develops.
By preferred scheme, the shape of each antenna wire turn is chosen as, and makes at least to be positioned at the antenna wire turn of front and/or to be positioned at the terminal described amount of staggering of antenna wire turn compensation along the direction that staggers along the direction that staggers in part row.In this structure, for example per second row can be designed to, respectively preceding and after the antenna wire turn bigger or less, thereby offset in per second row compensation, and all the other all antenna elements are identical.
By particularly preferred scheme, local coil transverse to antenna wire turn misarrangement evolution in each row of phase opposite side, an edge antenna wire turn alternately is designed to arrange the big area of other antenna wire turns than this.Therefore press this programme, in two rows that move along the identical direction that staggers mutually, that is in whenever next was arranged again, edge antenna wire turn designed identically.
If for example all the other antenna wire turns have substantially the same external dimensions, and row's the width that always staggers each other alternately longitudinally with half antenna wire turn carries out, and must be this width of arranging all the other antenna wire turns one and half along the direction that stagger at the per second first edge antenna wire turn that comes the phase opposite side only then.This causes the entire antenna group can cover the area of substantial rectangular automatically, and still reaches the offsetting of expectation between each antenna wire turn row and thereby realize the decoupling that requires.
For obtaining this local coil maximum flexibility is arranged when it uses, advantageously, local coil such as top mentioned that works along any direction and be positioned at check on the object.Therefore by a kind of preferred scheme, local coil has position identification device, is used for determining that local coil is in the orientation about the space of at least two direction in spaces.If discern the locus of local coil whereby, then positional information can be passed to magnetic resonance device, can consider the position of each antenna wire turn in the space when assessing this signal afterwards.
Particularly preferably be, local coil has a magnetic field sensing device for this reason, is used to measure local coil and is in wherein magnetic field, and here magnetic field can be determined along at least two direction in spaces.For example can relate to a kind of suitable hall probe device that comprises related electronic devices here.Can utilize the B of magnet this moment
0Field of first harmonic is determined the dimensional orientation of coil, and it is further passed to magnetic resonance device as positional information.
By another kind of form of implementation, local coil for example adds mark, and they can be by the optical detection apparatus identification of magnetic resonance device, so that determine the position.Otherwise local coil also can be equipped with optical detection apparatus, for example recognizing mark in magnetic resonance device patient chamber interior, and the position of determining oneself in view of the above.In addition, also can determine the position from the difference emitted radio signal by means of a plurality of.
As top mentioned, a plurality of antenna wire turns that can control one by one need corresponding spaces, to settle relevant electron device.What belong to this electron device for example is the prime amplifier that is suitable for, and it places the signal that receives the level of regulation.In newer product, magnetic resonance signal can be an intermediate frequency in the local coil internal conversion also.At this moment, be installed in the signal that receiver filters and digitizing is received by local coil in the magnetic resonance device, and transfer data to digital signal processor, it derives image or frequency spectrum according to measurement, they can be offered the user then and for example be used for diagnosis.It is contemplated that also described digitizing is at the local coil internal implementation.
Yet all these electron devices cause coil mechanically heavier and firmer.For obtaining enough flexibilities, the adjacent antenna groups of turns that is preferably magnetic resonance antenna group regulation sets respectively and is placed in local electronic package, the signal that its pre-service receives from the antenna wire turn of attaching troops to a unit.“
Electron device is trooped " oneself small outline package can be arranged respectively.Preferably for example be that two adjacent antenna wire turns set oneself a electron device and troop among the row.Have the scheme of small electric sub-component to replace a big electronic package with this, local coil can be realized high mechanical flexibility along two sides.
By a kind of particularly preferred scheme, an electronic package has a traffic pilot, that is the multiplex circuit device that is suitable for, so that will superpose by multiplexing method in order to be transferred to the magnetic resonance device receiving-member from the signal of different antennae wire turn reception.Adopt multiplexing method minimizing local coil inside or be used to transmit required cable to the magnetic resonance device receiving system from local coil.
Preferably, described stack is undertaken by the channeling method.Belong to adjacent antenna wire turn that an electron device troops when overlapping at per two, can use for example two sidebands of transmission frequency, and the magnetic resonance signal of an antenna wire turn is transferred to one of them sideband, and the magnetic resonance signal of another antenna wire turn is transferred to another sideband.
Preferably, the cable that leads to different electronic modules accumulates in the center in the local coil, preferably center electron assembly place.They are further guided by public junction line therefrom then, so that local coil and magnetic resonance device receiving system can be coupled together.
For reaching high as far as possible acceleration factor, local coil particularly preferably has a magnetic resonance antenna group that comprises three row's antenna wire turns.Particularly preferably be, in each row, establish six antenna wire turns.This means that local coil always has 18 individual antenna wire turns at this moment.Therefore, when employing comprised the magnetic resonance antenna group of three row's antenna wire turns, the row of central authorities effluxed mobile with respect to two.
In fact use the preabdomen coil that comprises 3x2 antenna wire turn or comprise 4x4 antenna wire turn so far.In these local coils, acceleration factor AF=4 almost no longer can clinically use because SNR worsens with the AF=4 parallel imaging time, and along phase-encoding direction only four antenna wire turns the result that can't assess often is provided.In addition, these antenna turn(s) ratio is firmer, especially can not adapt to patient's body structure in abdomen part well.For the heart radiography needs acceleration factor is AF=3 to 4, to shorten long Measuring Time.Chang Measuring Time is why cardiac work up only often would rather adopt one of reason of other inspection methods by magnetic resonance device smaller part enforcement and radiology so far.
By three local coils of arranging each six antenna wire turn and however still having flexibility that comprise by the present invention's structure, can produce can be at the very high-quality acceleration factor AF=4 of clinical assessment.In case of necessity according to concrete operating position even can to reach higher acceleration factor be AF=5 or AF=6.
Preferably, the antenna wire turn is designed to make it to be depicted as an octagon face basically, and this moment, particularly preferably the antenna wire turn was transverse to staggering direction and along the direction that staggers, that is perpendicular to the vertical and side that extends longitudinally of arranging, the side that tilts to extend with it on the ratio antenna wire turn is long.This octagonal advantage is, makes thereon printed conductor section for the printed conductor that forms overlay region and adjacent antenna wire turn intersects, and is perpendicular to one another in joining and meets.Make the coupling minimum between the printed conductor thus.
By a kind of particularly preferred scheme, the antenna wire turn vertically has an antenna wire turn width between 5cm and 30cm transverse to antenna wire turn row's.The antenna wire turn is along vertical width that particularly preferably has between 5cm and 30cm of row.If select this scheme of antenna sets, that is it is bigger wherein only alternately to come edge antenna element of phase opposite side per second, and then for example when offsetting half antenna wire turn width, its width approximately is this half as much again of arranging all the other antenna wire turn width.
Description of drawings
Elaborate the present invention referring to accompanying drawing once more by embodiment.Wherein:
Fig. 1 schematically illustrates by a kind of embodiment of local coil of the present invention, includes an antenna sets of 18 antenna wire turns; And
Fig. 2 represents to comprise antenna sets as shown in Figure 1 by local coil vertical view of the present invention.
Embodiment
Local coil 1 shown in Figure 1 always has three row SR
1, SR
2, SR
3, they respectively have six individual antenna wire turns 3,3A.These arrange SR
1, SR
2, SR
3Along local coil 1 longitudinal extension, it is in the coordinate system x/z plane of magnetic resonance laminography instrument in Fig. 1, and is along the x direction with its portrait orientation.But local coil can be located arbitrarily in principle.However, for simplicity below still based on direction in space x, y among Fig. 1, but the present invention is not limited.
Each antenna wire turn 3,3A have printed conductor respectively, and they describe an octagon, comprise four longer sides and four shorter sides (below be also referred to as " angle section ") that are connected longer side at the diagonal angle respectively.The outward flange that longer side is parallel to local coil 1 extends, that is extends along x direction and z direction in Fig. 1.In these longer sides, wire turn interrupts respectively.The capacity cell (not shown) of shortening capatcitor effect has been set at these discontinuous points C.
At a row SR
1, SR
2, SR
3Inside, adjacent antenna wire turn 3,3A, 3E be the overlay region U of overlapping regulation respectively
X, its size is chosen as, and makes related antenna wire turn 3,3A, 3E inductance decoupling as far as possible effectively each other.Therefore two adjacent antenna wire turns 3,3A, 3E can form described overlay region U
X, each printed conductor of octagon antenna wire turn 3,3A, 3E intersects in the section of the angle at diagonal angle.
The printed conductor of antenna wire turn 3,3A, 3E is stamped on the flexible conductor sheet usually with the form of copper bar respectively, wherein, the printed conductor of antenna wire turn 3,3A, 3E is stamped in the front side of printed conductor thin slice by a section part, a part is stamped in the rear side of printed conductor thin slice, and applies the plating connection by through hole respectively.Reach thus, different adjacent antenna wire turns 3, the printed conductor of 3A, 3E need not other change expenses and can intersect by mutual insulating.
Each antenna wire turn 3,3A, 3E are typically provided with some element (not shown)s in addition, on-off element for example is as Pin diode and so on, with the related antenna wire turn 3 of box lunch, when 3A, 3E should not receive, make antenna wire turn 3,3A, 3E break away from resonance, that is tuning.When for example other antennas just in time send magnetic resonance signal, be this situation.In this case, the antenna wire turn that is in resonance state is understood direct receiving magnetic resonance signals and cause interference when excitation.
In Fig. 1 as can be seen, the row SR of antenna wire turn 3,3A, 3E
1, SR
2, SR
3Closely settle along the z direction, make them overlapping equally, and middle row SR
2Efflux SR with respect to two
1, SR
3The edge is parallel to the vertical of row, that is the direction R that staggers that extends along the x direction in Fig. 1
2Move, or two efflux SR
1, SR
3Along the opposite direction R that staggers
1, R
3With respect to middle row SR
2Move.Row SR
1, SR
2, SR
3Offsetting amount each other be chosen as, make antenna wire turn 3 along staggering direction R
1, R
2, R
3Antenna wire turn width b offsets half
XIn this way, a row's adjacent antenna wire turn 3, the overlay region U between 3A, the 3E
XWith respect to adjacent row SR
1, SR
2, SR
3Overlay region U
XStagger each other.
Adjacent thus row SR
1, SR
2, SR
3Can distinguish an overlapping overlay region U
Z, can not cause overlapping four individual antenna wire turns 3,3A, 3E.Maximum here overlapping three antenna wire turns 3,3A, 3E, that is be that two antenna wire turns 3 adjacent in a row, 3A, 3E and adjacent adjacent antenna wire turn 3,3A, a 3E who arranges are overlapping all the time.
In order however still to guarantee, whole antenna sets 2 except the angle of position, boundary between two antenna wire turns 3,3A, 3E and little recess 9, are still described a kind of profile of substantial rectangular, and thereby also have the almost illumination section of rectangle, so respectively one row SR
1, SR
2, SR
3The edge antenna wire turn 3A of beginning and end, 3E has compares different shape with central antenna wire turn 3.
Especially, at three row SR
1, SR
2, SR
3Each row in, along staggering direction R separately
1, R
2, R
3First antenna wire turn 3A that observes changes and paints bigger area, that is is that the half as much again of central antenna wire turn 3 areas is big.Guarantee thus, all come local coil 1 two horizontal sides (transverse to row vertically, that is along the z direction among Fig. 1) stop online L respectively
1, L
2The place.
Respectively along staggering direction R
1, R
2, R
3Be in terminal edge antenna wire turn 3E, with regard to its octagonal shape, in each row, face local coil 1 outer peripheral that side at it respectively and be adjusted into less shape, overlapping to reach first edge antenna wire turn 3A the best that increases with adjacent row, especially, make thus joining between the adjacent antenna wire turn be in the center of octagon angle section again.
Per here two adjacent antenna wire turns 3,3A, 3E attach troops to a unit in oneself a electron device troop 4,4M.The overlay region U that this electron device troops 4,4M is located at two antenna wire turns 3,3A, 3E respectively
XIn.Troop 4 at this electron device, a printed circuit board be installed in the 4M respectively, comprise the necessary electronic device, two prime amplifier 6 especially, their amplify and pre-service by the magnetic resonance signal of relevant antenna wire turn 3,3A, 3E reception.Troop 4 at electron device, the element that is used for tuned antenna wire turn 3,3A, 3E, for example Pin diode can also be installed in the 4M on printed circuit board (PCB).Especially, each this electron device is trooped a multiplex circuit device 5, and it is used for the signal from two antenna wire turns 3,3A, 3E is superposeed by the channeling method.In this way, the signal of two antenna wire turns 3,3A, 3E can be trooped from electron device by common cable 74 derives.For this reason, every one by one the Thin cable 7 of coaxial shielding have external diameter about 1 to 1.1mm just enough.All this cables 7 lead to the central electronic device 4M that troops.Here each cable 7 accumulates in one and compiles in the line 8, and thick the magnetic resonance device that leads in the junction line 13 of the external shield of whole unit cables is arranged usually at one therefrom.This relends in the back and helps Fig. 2 to illustrate.
In addition, in the central electronic device is trooped 4M, also establish two hall probes that comprise suitable electronic evaluation part, be in wherein magnetic field so that measure along two current local coils 1 of direction in space x, z.Determine the orientation of local coil 1 by being applied to main field in the magnetic resonance device in this way.This can be transferred to the receiving system of magnetic resonance device by umbilical cable equally then, thereby can consider the orientation of local coil in magnetic resonance device inside there.This point is important for the position of correctly giving each antenna wire turn 3,3A, 3E.In addition, also identifying information is transferred to the receiving system of magnetic resonance device from the central electron device 4M that troops, can discern local coil 1 type and frame mode thereof accurately by its magnetic resonance device, so that can correctly handle, especially for example can also correctly implement the Signal Separation of institute's transmission signals from the signal of local coil transmission.These information, for example identification code of monodrome and/or type codes leave the central electronic device in and troop in the storer (not shown) among the 4M.
Fig. 2 represents the external structure of local coil 1.Here as can be seen, each electron device is trooped and is in respectively in the independent shell 11, and they are integrated in the shell 10 of local coil 1 magnetic resonance antenna group 2.Shell 10 (outline of having represented it in Fig. 1) is designed to flexible, for example made by flexible foam plastic, and each shell 11 that electron device is trooped is rigidity.In addition, the shell 10 of local coil 1 has a plurality ofly leaves a blank 17, and their guarantee that local coil 1 has higher flexibility.
Fig. 2 represents that also the troop shell 11M of 4M of central electronic device is provided with the attachment plug 12 of junction line 13.At tie point 15, this junction line 13 detachably is connected with attachment plug 12.Junction line 13 is provided with connector 14 at its free end, and junction line 13 can be connected with the receiving system of magnetic resonance device by it.
Such as already mentioned, junction line 13 have a plurality of from each electron device troop 4, the unit cable of 4M, that is nine unit cables altogether, they transmit each two magnetic resonance signal that individual antenna wire turn 3,3A, 3E superpose in Frequency reuser, and at least one order wire arranged, it is transferred to magnetic resonance device the information via of local coil 1, for example current orientation and/or identifying information.In addition, junction line 13 also contains a control line, can be by it by the magnetic resonance device control example as Pin diode or similar switchgear in antenna wire turn 3,3A, 3E inside, thereby under situation about sending, that is when implementing the magnetic resonance signal transmission, can carry out tuning to it by another antenna.Order wire and control line can be realized in a physical cables when appropriate coding.Spacing in accordance with regulations, junction line 13 is provided with surface wave block device 16, gives the screen layer of junction line 13 to avoid surface wave propagation.
In the present embodiment, each antenna wire turn 3,3A, 3E are along the wire turn width b of z direction
XBe about 14.5cm at maximum.Along staggering direction R
1, R
2, R
3The wire turn width b of each first edge wire turn 3A
X, ABe about 14.5cm equally.Remaining antenna wire turn 3,3E are respectively along arranging wire turn width b longitudinally
XOnly be first edge wire turn 3A wire turn width b
X, A2/3rds, that is wire turn width b
XBe 9.7cm.But the present invention also can construct the antenna wire turn of arbitrary dimension in principle.But should point out emphatically, described size is particularly advantageous when clinical use.
What embodiment represented as shown in drawings is such, by pressing structure of the present invention, can make a kind of local coil in very simple and efficient mode, it has a lot of individual antenna wire turn of quantity on the one hand, and it is when having the highest luminance district with regard to the local coil external dimensions, allow the very effective and simple inductance decoupling fully of all antenna wire turns adjacent one another are, and meanwhile allow local coil that high flexibility is arranged.
To point out again also that here the concrete structure of representing among the figure only relates to a kind of embodiment, and also can change, only otherwise break away from the scope of the present invention by the claim regulation by the antenna sets ultimate principle of the present invention design.For being also pointed out that, integrality use indefinite article " " not get rid of the possibility that related feature also can repeatedly exist.
Claims (15)
1. local coil (1) with magnetic resonance antenna group (2), magnetic resonance antenna group (2) comprises a plurality of adjacent row (SR that are arranged in
1, SR
2, SR
3) in antenna wire turn (3,3A, 3E), wherein, antenna wire turn disposed adjacent one another (3,3A, 3E) is respectively by how much overlapping (U
X, U
Z) mutually inductance decoupling, wherein, antenna wire turn (3,3A, 3E) row (SR
1, SR
2, SR
3) by the direction (R that alternately staggers
1, R
2, R
3) stagger mutually for, make one row (SR
1, SR
2, SR
3) in the overlay region (UX) and an adjacent row (SR of two antenna wire turns (3,3A, 3E)
1, SR
2, SR
3) in the overlay region (U of two antenna wire turns (3,3A, 3E)
X) be staggeredly arranged, and wherein, at least a portion antenna wire turn (3,3A, 3E) is designed for the compensation amount of staggering, and makes them change the adjacent row (SR that is depicted as different areas and makes antenna wire turn (3,3A, 3E) thus
1, SR
2, SR
3) along staggering direction (R
1, R
2, R
3) terminate in respectively transverse to the direction (R that staggers basically at front end with in the rear end
1, R
2, R
3) straight line (L
1, L
2) on.
2. according to the described local coil of claim 1, it is characterized by, at least at part row (SR
1, SR
2, SR
3) in be positioned at the antenna wire turn (3A) of front and/or be positioned at the terminal described amount of staggering of antenna wire turn (3E) compensation along the direction that staggers along the direction that staggers.
3. according to the described local coil of claim 2, it is characterized by, be in antenna wire turn (3,3A, 3E) row (SR at local coil (1)
1, SR
2, SR
3) transverse to the direction (R that staggers
1, R
2, R
3) each row (SR of phase opposite side
1, SR
2, SR
3) in, edge antenna wire turn (3A) alternately changes and is depicted as one than this row (SR
1, SR
2, SR
3) the big area of other antenna wire turns (3,3E).
4. according to the described local coil of one of claim 1 to 3, it is characterized in that having position identification device (H
x, H
Z), be used for determining that local coil (1) is in the orientation about the space of at least two direction in spaces (x, z).
5. according to the described local coil of one of claim 1 to 4, it is characterized in that having magnetic field sensing device (H
x, H
Z), be used for measuring local coils (1) and be in wherein measurement magnetic field along at least two direction in spaces (x, z).
6. according to the described local coil of one of claim 1 to 5, it is characterized by, for setting one, the adjacent antenna wire turn of each group (3,3A, 3E) is placed in local electronic package (4,4M), the signal that the antenna wire turn that its pre-service is set by correspondence (3,3A, 3E) receives.
7. according to the described local coil of claim 6, it is characterized by, electronic package (4,4M) has a traffic pilot (5), so that the signal that will receive from different antennae wire turn (3,3A, 3E) is by multiplexing method, and preferably channeling method stack.
8. according to claim 6 or 7 described local coils, it is characterized by, the cable (6) that leads to different electronic modules (4) accumulates in the interior center of local coil (1), and preferably center electron assembly (4M) is located.
9. according to the described local coil of one of claim 1 to 6, it is characterized by, the magnetic resonance antenna group comprises three row (SR
1, SR
2, SR
3) antenna wire turn (3,3A, 3E); And/or at each row (SR
1, SR
2, SR
3) in establish six antenna wire turns (3,3A, 3E).
10. according to the described local coil of one of claim 1 to 9, it is characterized by, antenna wire turn (3,3A, 3E) is depicted as an octagon face basically.
11. according to the described local coil of one of claim 1 to 10, it is characterized by, antenna wire turn (3,3A, 3E) is transverse to antenna wire turn (3,3A, 3E) row (SR
1, SR
2, SR
3) vertically have an antenna wire turn width (b between 5cm and 30cm
Z); And/or antenna wire turn (3,3A, 3E) is along row (SR
1, SR
2, SR
3) vertically have an antenna wire turn width (b between 5cm and 30cm
X, b
X, A).
12. according to the described local coil of one of claim 1 to 11, it is characterized by, magnetic resonance antenna group (2) is installed in the shell of being made by flexible material (10).
13. one kind has the magnetic resonance device according to the described local coil of one of claim 1 to 12 (1).
14. the building method with local coil (1) of magnetic resonance antenna group (2), magnetic resonance antenna group (2) comprise a plurality of adjacent row (SR that are arranged in
1, SR
2, SR
3) in antenna wire turn (3,3A, 3E), wherein, antenna wire turn adjacent one another are (3,3A, 3E) is arranged as respectively, makes them pass through overlapping (U how much
X, U
Z) mutually inductance decoupling, wherein, antenna wire turn (3,3A, 3E) row (SR
1, SR
2, SR
3) by the direction (R that alternately staggers
1, R
2, R
3) stagger mutually for, make one row (SR
1, SR
2, SR
3) in the overlay region (U of two antenna wire turns (3,3A)
X, U
Z) with adjacent row in the overlay region (U of two antenna wire turns (3,3A, 3E)
X, U
Z) stagger, and wherein, at least a portion antenna wire turn (3,3A, 3E) is designed for the compensation amount of staggering, and makes them change and is depicted as different areas and makes the adjacent row (SR of antenna wire turn (3,3A, 3E) thus
1, SR
2, SR
3) along staggering direction (R
1, R
2, R
3) terminate in straight line (L basically respectively transverse to the direction that staggers at front end with in the rear end
1, L
2) on.
15. the measuring method of a magnetic resonance signal, wherein magnetic resonance signal detects by the local coil that magnetic resonance antenna group (2) are arranged (1), and magnetic resonance antenna group (2) comprises a plurality of adjacent row (SR that are arranged in
1, SR
2, SR
3) in antenna wire turn (3,3A, 3E), wherein, antenna wire turn adjacent one another are (3,3A) is arranged as respectively, makes them pass through overlapping (U how much
X, U
Z) mutually inductance decoupling, wherein, antenna wire turn (3,3A, 3E) row (SR
1, SR
2, SR
3) by the direction (R that alternately staggers
1, R
2, R
3) stagger mutually for, make one row (SR
1, SR
2, SR
3) in the overlay region (U of two antenna wire turns (3,3A, 3E)
X, U
Z) and an adjacent row (SR
1, SR
2, SR
3) in the overlay region (U of two antenna wire turns (3,3A, 3E)
X, U
Z) stagger, and wherein, at least a portion antenna wire turn (3,3A, 3E) is designed for the compensation amount of staggering, and makes them change the adjacent row (SR that is depicted as different areas and makes antenna wire turn (3,3A, 3E) thus
1, SR
2, SR
3) along staggering direction (R
1, R
2, R
3) terminate in respectively transverse to the direction (R that staggers basically at front end with in the rear end
1, R
2, R
3) straight line (L
1, L
2) on.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010024432.5 | 2010-06-21 | ||
| DE201010024432 DE102010024432A1 (en) | 2010-06-21 | 2010-06-21 | Local coil for use in magnetic resonance device for patient, has conductor loops arranged opposite to each other along offset directions, where part of conductor loops is designed for balancing offset such that rows of loops end on lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102288930A true CN102288930A (en) | 2011-12-21 |
Family
ID=45091147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101674050A Pending CN102288930A (en) | 2010-06-21 | 2011-06-21 | Local coil and consctruction method, magnetic resonance instrument,method for measuring manetic magnetic resonance signal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102288930A (en) |
| DE (1) | DE102010024432A1 (en) |
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| CN109100668A (en) * | 2017-06-21 | 2018-12-28 | 西门子保健有限责任公司 | Magnetic resonance coil device with adaptive coil spacing layer |
| US10395808B2 (en) | 2014-07-31 | 2019-08-27 | Siemens Aktiengesellschaft | Decoupling inductor assembly, radio frequency receiving coil and magnetic resonance imaging apparatus |
| WO2019205151A1 (en) * | 2018-04-28 | 2019-10-31 | 中国科学院深圳先进技术研究院 | Flexible radiofrequency receiving coil array |
| CN111157929A (en) * | 2018-11-08 | 2020-05-15 | 西门子医疗有限公司 | Local coil with integrated pilot tone transmitter |
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| CN102749597A (en) * | 2012-07-04 | 2012-10-24 | 苏州众志医疗科技有限公司 | Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5179820B2 (en) * | 2006-10-27 | 2013-04-10 | 株式会社東芝 | High frequency coil device |
| DE102007002187B4 (en) * | 2007-01-15 | 2010-02-11 | Siemens Ag | Device and method for the optical transmission of magnetic resonance signals in magnetic resonance systems |
| US7612564B1 (en) * | 2008-04-30 | 2009-11-03 | General Electric Company | Tiled receiver coil array with improved spatial coverage |
| DE102008048476B4 (en) * | 2008-09-23 | 2013-01-31 | Siemens Aktiengesellschaft | Magnetic resonance system with orientation detection of aids |
-
2010
- 2010-06-21 DE DE201010024432 patent/DE102010024432A1/en not_active Ceased
-
2011
- 2011-06-21 CN CN2011101674050A patent/CN102288930A/en active Pending
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| US10395808B2 (en) | 2014-07-31 | 2019-08-27 | Siemens Aktiengesellschaft | Decoupling inductor assembly, radio frequency receiving coil and magnetic resonance imaging apparatus |
| CN109100668A (en) * | 2017-06-21 | 2018-12-28 | 西门子保健有限责任公司 | Magnetic resonance coil device with adaptive coil spacing layer |
| US10698045B2 (en) | 2017-06-21 | 2020-06-30 | Siemens Healthcare Gmbh | Magnetic resonance coil arrangement with adaptive coil spacing layer |
| CN109100668B (en) * | 2017-06-21 | 2021-06-25 | 西门子保健有限责任公司 | Magnetic resonance coil arrangement with adaptive coil spacing layer |
| WO2019205151A1 (en) * | 2018-04-28 | 2019-10-31 | 中国科学院深圳先进技术研究院 | Flexible radiofrequency receiving coil array |
| US20220349966A1 (en) * | 2018-04-28 | 2022-11-03 | Shenzhen Institutes Of Advanced Integration Technology Chinese Academy Of Sciences | Flexible radio frequency receiving coil array |
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| CN111157929A (en) * | 2018-11-08 | 2020-05-15 | 西门子医疗有限公司 | Local coil with integrated pilot tone transmitter |
| US11340322B2 (en) | 2018-11-08 | 2022-05-24 | Siemens Healthcare Gmbh | Local coil with integrated pilot tone transmitter |
| CN111157929B (en) * | 2018-11-08 | 2022-07-08 | 西门子医疗有限公司 | Local coil with integrated pilot tone transmitter |
| CN113777541A (en) * | 2020-06-10 | 2021-12-10 | 西门子医疗有限公司 | Local coil, magnetic resonance system, method and tool for producing a local coil |
| CN113777541B (en) * | 2020-06-10 | 2024-04-26 | 西门子医疗有限公司 | Local coil, magnetic resonance system, method and tool for producing a local coil |
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|---|---|
| DE102010024432A1 (en) | 2011-12-22 |
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Application publication date: 20111221 |