CN102243293B - RF coil and magnetic resonance imaging apparatus - Google Patents

RF coil and magnetic resonance imaging apparatus Download PDF

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Publication number
CN102243293B
CN102243293B CN201110094238.1A CN201110094238A CN102243293B CN 102243293 B CN102243293 B CN 102243293B CN 201110094238 A CN201110094238 A CN 201110094238A CN 102243293 B CN102243293 B CN 102243293B
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China
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mentioned
inner loop
coil
key element
main ring
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CN102243293A (en
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石原隆寻
冈本和也
光井信二
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Canon Medical Systems Corp
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Toshiba Corp
Toshiba Medical Systems Corp
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Abstract

The invention provides a radio-frequency (RF) coil and a magnetic resonance imaging (MRI) apparatus. In a radio-frequency (RF) coil, a plurality of coil elements, each of which receives a magnetic resonance signal from a subject, are arranged in each of a first unit and a second unit, where the two units can be joined with or separated from each other, wherein at least a first coil element, which is one coil element among the coil elements in the first unit, has a first main loop and a first sub-loop connected with the first main loop in series, at least a second coil element, which is one coil element among the coil elements in the second unit, has a second main loop, and a second sub-loop connected with the second main loop in series and facing the first sub-loop at a portion capable of joining/separating and being oppositely-orientated with respect to a winding direction of the first sub-loop, and a retaining unit is provided that retains a positional relationship where the first sub-loop and the second sub-loop are mutually faced.

Description

RF coil and MRI device
The divisional application that the application is application number is 200810083099.0, the applying date is on March 21st, 2008, denomination of invention is the application for a patent for invention of " RF coil and MRI device ".
(related application)
The right of priority of to be the Japanese patent application No. proposed in the application of 2007-74794 and on January 18th, 2008 the be application of 2008-009068 that the application enjoys the Japanese patent application No. proposed on March 22nd, 2007, and the full content of this Japanese patent application is quoted in the present invention.
Technical field
The present invention relates to MRI (Magnetic Resonance Imaging: magnetic resonance imaging) device, and to be connected with this MRI device and to receive the high-frequency coil device (RF coil (coil)) of the magnetic resonance signal occurred from subject, particularly arrange the decoupling (decoupling) of the high-frequency coil device that multiple element (element) (key element coil) forms.
Background technology
In the past known, region desired by image conversion should configure multiple element at subject, the magnetic resonance signal from subject is detected respectively via these multiple elements, respectively image conversion process is being carried out to the magnetic resonance signal detected and after generating the view data of multiple series, be added afterwards by the weighting function that the distribution of being multiplied by the high frequency magnetic field occurred according to each element between the pixel data (single complex signal or one dimension complex signal=wave spectrum (spectral) signal) corresponding with same spatial location is predetermined, make the data of each pixel, by synthesizing an image in desired region, obtain high S/N image.
In this approach, because within the time in order to obtain required for an image, observe magnetic resonance signal with multiple elements simultaneously, so in order to mutually not interfere on stabilization member ground, even if the high-frequency current namely in order to flow through assigned frequency in an element does not also flow through high-frequency current in other element, and needs intercouple (decoupling) preventing coil.
In the past, propose such technology, namely by 2 elements aiming at arow configuration in the arrangement plane of regulation are only overlapped in the arrangement plane of the size of the area decision of surrounding with coil, as in the magnetic field such as occurred when the element upper reaches excess current of a side, decoupling is carried out (such as under becoming 0 such state with the summation in the magnetic field of the element interlinkage of the opposing party, with reference to United States Patent (USP) the 4th, 825, No. 162 instructionss).
On the other hand, the high-frequency coil device being connected, receiving the magnetic resonance signal occurred from subject with MRI device is generally high weight.Therefore, proposed the scheme (for example, referring to JP 2006-14823 publication) carrying out splitting/linking between adjacent 2 elements in the past.
But, at above-mentioned United States Patent (USP) the 4th, in the decoupling method proposed in 825, No. 162 instructionss, need in the split/link section of housing (case), allow 2 elements overlap in arrangement plane.Therefore, such as exist and the profile design of the housing of the part of coincidence must be obtained this unsolved problem thin; With can not split with being aligned on the orthogonal face of column direction of element according to the needs overlapped, and the split/link section of housing becomes this unsolved problem concavo-convex.
Summary of the invention
The RF coil configuration of a kind of form of the present invention has the multiple key element coils received from the magnetic resonance signal of subject, it is characterized in that: the inner loop that there is main ring as the 1st key element coil of the key element coil of at least one party in non-conterminous 2 key element coils and be connected in series with this main ring, use this inner loop, carry out decoupling with the 2nd key element coil of the key element coil as the opposing party.
In addition, the RF coil of another form of the present invention Unit the 1st of connected/separated and Unit the 2nd can be configured with the multiple key element coils received from the magnetic resonance signal of subject respectively, it is characterized in that: the 1st inner loop that the 1st key element coil as at least one the key element coil in multiple key element coils of above-mentioned Unit the 1st has the 1st main ring and is connected in series with the 1st main ring
As the 2nd key element coil of at least 1 key element coil in multiple key element coils of above-mentioned Unit the 2nd, there is the 2nd main ring and to be connected in series with the 2nd main ring and with above-mentioned 1st inner loop at above-mentioned the 2nd inner loop that can be relative and contrary with the coiling direction of above-mentioned 1st inner loop in the part of connected/separated, for keeping the maintaining part of above-mentioned 1st inner loop and the relative position relationship of above-mentioned 2nd inner loop.
In addition, the RF coil of another form of the present invention is configured with that be arranged on can on Unit the 1st of connected/separated and Unit the 2nd, receive the multiple key element coils from the magnetic resonance signal of subject, it is characterized in that: the 1st key element coil in above-mentioned multiple key element coil is configured on above-mentioned Unit the 1st, there is the 1st main ring, and the 1st inner loop to be connected in series with the 1st main ring, the 2nd key element coil in above-mentioned multiple key element coil is configured on above-mentioned Unit the 2nd, there is the 2nd main ring, and be connected in series with the 2nd main ring, and be arranged to relative with above-mentioned 1st inner loop, and 2nd inner loop contrary with the coiling direction of above-mentioned 1st inner loop, under the state that the 3rd key element coil in above-mentioned multiple key element coil links at above-mentioned Unit the 1st and Unit the 2nd, the 3rd main ring is formed via electrical cnnector.
In addition, the MRI device of another form of the present invention possesses: apply static magnetic field to subject, and apply the applying unit of gradient magnetic; Receive multiple key element coils of the magnetic resonance signal from the subject being applied in above-mentioned static magnetic field and gradient magnetic, as the inner loop that the 1st key element coil of the key element coil of at least one party in non-conterminous 2 key element coils has main ring and is connected in series with this main ring, use this inner loop, carry out decoupling with the 2nd key element coil of the key element coil as the opposing party.
In addition, the MRI device of another form of the present invention possesses: apply static magnetic field to subject, and apply the applying unit of gradient magnetic, Unit the 1st of connected/separated and Unit the 2nd can possess multiple key element coils of the magnetic resonance signal received respectively from the subject being applied with above-mentioned static magnetic field and gradient magnetic, the 1st key element coil as at least 1 key element coil in multiple key element coils of above-mentioned Unit the 1st has the 1st main ring, and the 1st inner loop to be connected in series with the 1st main ring, the 2nd key element coil as at least 1 key element coil in multiple key element coils of above-mentioned Unit the 2nd has the 2nd main ring, and be connected in series with the 2nd main ring, and with above-mentioned 1st inner loop above-mentioned can be relative in the part of connected/separated, and 2nd inner loop contrary with the coiling direction of above-mentioned 1st inner loop, for keeping the maintaining part of position relationship that above-mentioned 1st inner loop is relative with above-mentioned 2nd inner loop.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of the MRI device of embodiments of the invention 1.
Fig. 2 carries out amplifying the outboard profile represented to the head coil device of Fig. 1.
Fig. 3 is the outboard profile representing the appearance opening head coil device.
Fig. 4 is the outboard profile of the configuration representing 8 elements be built in head coil device.
Fig. 5 is the front view (FV) of the configuration representing 8 elements be built in head coil device.
Fig. 6 is the detailed side view representing 2 elements adjacent in partitioning portion.
Fig. 7 is the side view for illustration of carrying out decoupling to the first element and the second element.
Fig. 8 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 2.
Fig. 9 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 3.
Figure 10 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 4.
Figure 11 is the figure of the head coil device representing other.
Figure 12 is the figure of the part representing the whole-body coil device comprising multiple unit.
Figure 13 represents in the whole-body coil device containing multiple unit, at non-conterminous other the figure of decoupling example interelement.
Figure 14 is the figure of a part for other the coil device represented containing multiple element.
Embodiment
Referring to accompanying drawing, describe the preferred embodiment of RF coil of the present invention and MRI device in detail according to drawing.And the present invention is not limited to this embodiment.
(embodiment 1)
Fig. 1 is the system construction drawing of the MRI device of embodiments of the invention 1.MRI device 100 has static field magnet 11, gradient magnetic field coil 13, leaning magnetic field power supply 15, radio-frequency coil 17, sending part 19, helmet-type head coil device 21 and acceptance division 25.
Identical static magnetic field is there is in columnar static field magnet 11 on inner space.Such as permanent magnet, superconducting magnet etc. is used in this static field magnet 11.The inner side of static field magnet 11 configures columnar gradient magnetic field coil 13.Gradient magnetic field coil 13 is consisted of combination 3 coils corresponding with each axle of mutually orthogonal X, Y, Z.These 3 coils are received current supply respectively from leaning magnetic field power supply 15, and the leaning magnetic field of magnetic field intensity along each axle inclination of X, Y, Z occurs.And, Z-direction hypothesis and static magnetic field equidirectional.
Columnar radio-frequency coil 17 is configured on inside gradient magnetic field coil 13.The inner side of this radio-frequency coil 17 is inserted the subject P be placed on top board 51.Radio-frequency coil 17 accepts the supply of high-frequency impulse from sending part 19, and high frequency magnetic field occurs.In addition radio-frequency coil 17 receives the magnetic resonance signal that the impact because of high frequency magnetic field is launched from subject P.
Sending part 19 has oscillating portion, Selecting phasing portion, frequency conversion part, Modulation and Amplitude Modulation portion and high frequency power enlarging section.Oscillating portion occurs in the high-frequency signal of resonant frequency intrinsic in the object atoms core in static magnetic field.The phase place of high-frequency signal is selected in Selecting phasing portion.The frequency of high frequency modulated portion to the high-frequency signal exported from Selecting phasing portion is modulated.Oscillating modulation portion such as modulates according to the amplitude of sinc function to the high-frequency signal exported from frequency modulation (PFM) portion.The high-frequency signal exported from Modulation and Amplitude Modulation portion is amplified in high frequency power enlarging section.Then as the result of the action in these each portions, the high-frequency impulse corresponding with Larmor (Larmor) frequency is sent to radio-frequency coil 17 by sending part 19.
Helmet-type head coil device (following, to be only called head coil device) 21 is configured to cover the head of whole subject P.8 not shown elements of head coil device 21 built-in annular coil composition.The element be built in this head coil device 21 receives the magnetic resonance signal launched from subject P.
Acceptance division 25 has selector switch, pre-amplifier, phase detector and analog digital (analog-digital) transducer.Selector switch inputs the magnetic resonance signal exported from radio-frequency coil 17 and head coil device 21 selectively.Acceptance division 25 amplifies the magnetic resonance signal exported from selector switch.Phase detector carries out detection to the phase place of the magnetic resonance signal exported from prime amplifier.The signal exported from phase detector is transformed to digital signal by analog digital converter.
Operator's console (operator console) portion 20 has: interface portion 31, data collection unit 33, reconstructing part 35, storage part 37, display part 39, input part 41 and control part 43.
Interface portion 31 is connected with leaning magnetic field power supply 15, sending part 19 and acceptance division 25.Interface portion 31 carries out the input and output of the signal of giving and accepting between each portion and operator's console 20 of these connections.
Data collection unit 33 collects the digital signal exported from acceptance division 25 via interface portion 31.The digital signal collected, i.e. magnetic resonance signal data are stored in storage part 37 by data collection unit 33.Reconstructing part 35 performs the reconstruct such as aftertreatment, i.e. Fourier transform to the magnetic resonance signal data be stored in storage part 37, asks spectral data (spectrum data) or the view data of the desired nuclear spin (spin) in subject P.
Storage part 37 stores magnetic resonance signal data, spectral data or view data according to each subject P.Display part 39 is the various information such as disclosing solution modal data or view data under the control of control part 43.The display devices such as liquid crystal display can be utilized as display part 39.Input part 41 accepts from the various instruction of technician and information input.Control part 43 synthetically controls these each portions, controls the shooting action of MRI device main body.
In the MRI device 100 of this structure, acceptance division 25 inputs the magnetic resonance signal exported from radio-frequency coil 17 and head coil device 21, generates magnetic resonance signal data.Then, the magnetic resonance signal data that control part 43 such as produces according to radio-frequency coil 17 carries out the shooting of the entirety of subject P.In addition, control part 43 carries out the shooting of the local of the head of subject P according to the magnetic resonance signal data that head coil device 21 produces.
Fig. 2 carries out amplifying the outboard profile represented to the head coil device 21 in Fig. 1.Fig. 3 is the outboard profile representing the appearance opening head coil device 21.Head coil device 21, in order to easily install and remove subject P, can be divided into upper coil device 21A and lower coil device 21B.
Fig. 4 is the outboard profile of the configuration representing 8 elements being built in head coil device 21.Fig. 5 is same front view (FV).Head coil device 21 has 8 the element E1 ~ E8 be arranged in housing.8 element E1 ~ E8 aim at arow for one week along the head surface of subject P around head and arrange.That is, 8 element E1 ~ E8 are being arranged in a row being aligned to column direction aims on the head curved surface of a week (arrangement plane) of subject P.
In 8 element E1 ~ E8,5 element E1 ~ E5 are arranged on upper coil device 21A.3 remaining element E6 ~ E8 are disposed on lower coil device 21B.That is, head coil device 21 is split between adjacent element E1 and E8 and between adjacent element E5 and E6.Then, the housing of head coil device 21 is between element E1, E8, and divided on the face orthogonal with being aligned to column direction on position between element E5, E6.
Fig. 6 is the detailed side view representing 2 elements adjacent in the split/link section of housing.In figure 6, using element E1 and E5 as the first element 1, element E8 and E6 is illustrated as the second element 2.And for convenience of explanation, the first element 1 and the second element 2 illustrate as the element of the substrate 60 and substrate 61 that form flat rectangular body respectively with circuit pattern.
First element 1 is made up of (end in the drawings, only representing link/segmentation side) 1 circuit pattern forming annular on the substrate 60.The structure of the first element 1 comprises: main ring portion 1a interarea (, the large area) 60a being formed in substrate 60 extending to the end of substrate 60 above; From this main ring portion 1a along the inner loop portion 1c (first-phase supports electromotive force induction part) that the end face 60b of substrate 60 is formed deviously.Main ring portion 1a is formed as 2 parallel patterns.Inner loop portion 1c is formed as the pattern of the roughly コ font be connected at both ends on these 2 patterns.
2nd element 2 is used in 1 article of circuit pattern composition (in the drawings, only representing the end of link/segmentation side) substrate 61 being formed ring.The structure of the second element 2 comprises: be formed in the main ring portion 2a on the interarea 61a of substrate 61; Be formed on the interarea 61a of substrate 61 near the cross part 2b in the part of end; From this cross part 2b along the inner loop portion 2c that the end face 61b of substrate 61 is bent to form (second-phase supports electromotive force induction part).Main ring portion 2a is formed as being arranged on the parallel pattern of on interarea 61a 2.Cross part 2b is formed as mutually extending to center direction is bending from these 2 parallel patterns, the pattern of the roughly X font near the pattern extending to opposite side after central portion intersects.Inner loop portion 2c is formed as the pattern of the roughly コ font be connected at both ends on this cross part 2b.
In cross part 2b, clip insulator when making, 2 patterns are intersected with insulating.First element 1 of such formation and the second element 2 overlap with mutual コ font portion and allow inner loop portion 1c and inner loop portion 2c be oppositely disposed like that.Then, the such as housing receiving the first element 1 and the second element 2 is split with the face orthogonal with being aligned to column direction between inner loop portion 1c and inner loop portion 2c.
Fig. 7 is the side view for illustration of carrying out decoupling to the first element 1 and the second element 2.The inner loop portion 1c of the first element 1 and inner loop portion 2c of the second element 2 is arranged to make in the inner loop portion of a wherein side to the magnetic flux of interlinkage in the inner loop portion of the opposing party towards being aligned to column direction, and then the induction electromotive force that this magnetic flux is occurred in the inner loop portion of the opposing party, with to become size from the main ring portion of a side in mutually opposite directions to the induction electromotive force that the magnetic flux of interlinkage in the main ring portion of the opposing party occurs in the main ring portion of the opposing party identical.
That is, be arranged to such as when at the first element 1 upper reaches excess current A 1when, from the face surrounded with inner loop portion 1c to the magnetic flux B of interlinkage in the face surrounded with inner loop portion 2c 2column direction is aligned to towards element.And, be arranged to by this magnetic flux B 2the electric current A that the induction electric occurred in inner loop portion 2c will definitely flow through in inner loop portion 2c 22, and by from main ring portion 1a to the magnetic flux B of main ring portion 2a interlinkage 1because of the electric current A that the induction electric occurred in main ring portion 2a will definitely flow through in main ring portion 2a 21size is identical in mutually opposite directions.Magnetic flux B 2size because deciding by the area surrounded with inner loop portion 1c with the area that inner loop portion 2c surrounds, so by adjustment two area, can easily be arranged to this relation.
And, as long as even if inner loop portion 1c and inner loop portion 2c is not strictly arranged to above-mentioned relation, is namely roughly arranged on above-mentioned relation, in the magnetic field that first element 1 and the second element 2 synthetically occur when the coil midstream excess current of a side in coil entirety, become 0 as long as be adjusted to the summation in the magnetic field of the coil interlinkage of the opposing party.
If adopt the MRI device of the present embodiment, because have: have with the parallel plane first main ring portion 1a of arrangement and on second element 2 side of this first main ring portion 1a first element 1 of the such first inner loop portion 1c (first-phase support electromotive force induction part) that arrange roughly orthogonal with arrangement plane; Have with the parallel plane second main ring portion 2a of arrangement and on first element 1 side of this second main ring portion 2a with the first inner loop portion 1c (first-phase support electromotive force induction part) second element 2 of relative the second inner loop portion 2c (second-phase supports electromotive force induction part) arranged like that, so the first element 1 and the second element 2 can be allowed in arrangement plane to carry out decoupling with overlapping.Therefore, by splitting between these 2 coils, the shape of the split/link section of coil device can be arranged to simple shape.In addition, the increase of the intensity of split/link section and the raising of designability can be sought thus, seek cost further and reduce.
In addition, if employing the present embodiment, because electromotive force induction part inner loop portion 1c, the 2c roughly in コ font that offset that induction becomes as the summation in the magnetic field of the coil interlinkage with the opposing party the electromotive force offseted in the of 0 is formed, so can effectively guarantee to offset, the area of electromotive force induction part, invalidly can not increase the size of split/link section.In addition, by being formed as コ font, the calculating of area becomes easy and adjustment becomes easy.
And, first element 1 of the present embodiment and the second element 2 are suitable for the partitioning portion of the head coil device 21 of helmet-type, as long as but arrange in multiple element arrangements and carry out the coil device splitting and link on the position of regulation, even then other coil device (lower limb coil device, foot coil etc.) also can be suitable for.
In addition, in the present embodiment, first element 1 and the second element 2 are for convenience of explanation, describe respectively on the substrate 60 and substrate 61 of flat rectangular shape with circuit pattern formed example, but be not limited to this, the first element 1 and the second element 2 also can be such as formed on coil rack by the wrapping conductors such as copper cash, in addition, also the plate formed with conductor can be pasted onto on substrate and be formed, also can be any formation.
And, although the cross part 2b of the present embodiment is arranged on the most end of the interarea 61a of substrate 61, also can be arranged on the topmost (near interarea side) of end face 61b.
(embodiment 2)
Fig. 8 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 2.In fig. 8, first element 3,1 circuit pattern composition forming ring, its formations comprises: the main ring portion 3a formed as 2 parallel patterns, on second element 4 side of this main ring portion 3a to bend the inner loop portion 3c (first-phase is to electromotive force induction part) formed like that from main ring portion 3a.Inner loop portion 3c is formed as the pattern of the roughly circular arc be connected at both ends on 2 patterns of main ring portion 3a.
Second element 4,1 circuit pattern forming ring is formed, and its formations comprises: as the main ring portion 4a of 2 parallel pattern formation; Be formed in the cross part 4b on first element 4 side of this main ring portion 4a; The inner loop portion 4c (second-phase supports electromotive force induction part) formed as bent from this cross part 4b.Inner loop portion 4c is formed as the pattern of the roughly circular arc be connected at both ends on this cross part 2b.
First element 3 and the second element 4 overlap with mutual circular arc portion and allow inner loop portion 3c and inner loop portion 4c relatively configure like that.And, in the magnetic field occurred when the first element 3 and the second element 4 are arranged in the coil midstream excess current of a side, become 0 with the summation in the magnetic field of the coil interlinkage of the opposing party.
Even if in first element 3 and the second element 4 of the present embodiment, also with in embodiment 1 carry out identical action, substantially same effect can be obtained.
(embodiment 3)
Fig. 9 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 3.In fig .9, the first element 51 circuit pattern forming ring is formed, and its formation comprises: the main ring portion 5a being formed as 2 parallel patterns; With the winder 5b (first-phase supports electromotive force induction part) that solenoid coil shape winding multi-turn is formed on the second element 6 side central portion of this main ring portion 5a.
Winder 5b is formed as the pattern that turns back to central side from one end of the main ring portion 5a of the side (Fig. 9 in face of side) be formed in arrangement plane exceeding central portion and extends to after in opposite side, turn back as orthogonal with arrangement plane, thereafter while turn left towards the second element 6 with the spiral wound regulation number of turns while extend on the second element 6 direction, thereafter turn back to arrangement plane, again exceed central portion and be connected with the main ring portion 5a of the opposing party.
Second element 6,1 circuit pattern forming ring is formed, and its formation comprises: the main ring portion 6a being formed as 2 parallel patterns; With the winder 6b (second-phase supports electromotive force induction part) that solenoid coil shape winding multi-turn is formed on the first element 5 side central portion of this main ring portion 6a.
Turn back the pattern that winder 6b is formed as turning back from one end of the main ring portion 6a of the side be formed in arrangement plane (side in front of Fig. 9) to central side is as orthogonal with arrangement plane in being no more than central portion, thereafter while turn left with the spiral wound number of turns same with winder 5b while extend on the first element 5 direction towards the first element 5, thereafter turn back to arrangement plane, be connected with the main ring portion 6a of the opposing party.
First element portion 5 relatively configures in the mode that the central shaft of the solenoid coil shape portion making mutual winder 5b, 6b is consistent with the second element portion 6.And, be arranged to such as when flowing through electric current A in the first element 5 1when, from the magnetic flux B to interlinkage in winder 6b in winder 5b 2become column direction towards coil alignment, and make by this magnetic flux B 2the electric current A that the induction electric occurred in winder 6b will definitely flow through in winder 6b 22, and lean on from main ring portion 5a to the magnetic flux B of main ring portion 6a interlinkage 1the electric current A that the induction electric occurred in main ring portion 6a will definitely flow through in main ring portion 6a 21size is identical in mutually opposite directions.Magnetic flux B 2size because determine by the area surrounded by winder 5b, 6b and the number of turns, so by adjusting the number of turns, can easily be arranged to this relation.
As described in Example 1, even if winder 5b and winder 6b is not strictly arranged to above-mentioned relation, as long as the first element 5 and the second element 6 are in coil entirety, in the magnetic field occurred when the coil midstream excess current of a side, become 0 with the summation in the magnetic field of the coil interlinkage of the opposing party.
If employing the present embodiment, then except can obtaining the effect roughly the same with embodiment 1, the winder 5b, the 6b that respond to the electromotive force induction part solenoid coil shape that offsets of the electromotive force offseted are formed, the size of electromotive force can be guaranteed, so the size of the housing of split/link section can be reduced further by the number of turns.In addition, can easily adjust by changing the number of turns.
(embodiment 4)
Figure 10 is the side view of the shape of the split/link section of coil device for illustration of embodiments of the invention 4.In Fig. 10, the first element 7 is identical with the element of embodiment 3, consists of the main ring portion 7a comprising and be formed as 2 parallel patterns; The winder 7b (first-phase supports electromotive force induction part) formed with solenoid coil shape winding, but the number of turns is formed as 1 circle by winder 7b.
Second element 8 is also the same with the element of embodiment 3, and it forms the main ring portion 8a comprising and be formed as 2 parallel patterns; The winder 8b (second-phase supports electromotive force induction part) formed with solenoid coil shape winding, but the number of turns is formed as 1 circle by winder 8b.
Even if in first element 7 and the second element 8 of the present embodiment, also carry out roughly the same action with the element of embodiment 3, substantially same effect can be obtained.
(embodiment 5)
, in above-described embodiment 1 ~ 4, describe the decoupling of 2 adjacent elements, but when using multiple coil, even non-conterminous 2 elements also need to carry out decoupling.Thus, in embodiment 5, the decoupling of non-conterminous element is described.
Figure 11 (a) is the figure of the outboard profile representing the head coil device different with the head coil device represented in embodiment 1.This head coil device 71 can be divided into upper coil device 71A and lower coil device 71B.Element 72 is adjacent with element 73, carries out both decouplings by arranging intersection.Element 73 is also adjacent with element 74, is carried out both decouplings by the part arranging coincidence.And element 73 forms ring by electrical cnnector 75 at 2 position connection top 73A and bottom 73B when closing head coil device 71.
Element 72 has decoupling main ring portion 72a and decoupling inner loop portion 72b, and element 74 has decoupling main ring portion 74a and decoupling inner loop portion 74b.Then, as shown in Figure 11 (b), decoupling inner loop portion 72b from decoupling main ring portion 72a arrange across and and decoupling inner loop portion 74b relatively arrange.Like this, by making decoupling inner loop portion 72b relative with decoupling inner loop portion 74b, the decoupling of non-conterminous element 72 and element 74 can be carried out.
Wherein, decoupling inner loop portion 72b and decoupling inner loop portion 74b need not offset relative.Thus, guiding pin 76 at this by arranging in upper coil device 71A, pin 76 will be guided to be inserted in the hole 77 be arranged on lower coil device 71B, keep the relative position relationship of decoupling inner loop portion 72b and decoupling inner loop portion 74b.
And latch mechanism such Figure 11 (c) Suo Shi also can be arranged between upper coil device 71A and lower coil device 71B by the parts as the relative position relationship keeping decoupling inner loop portion 72b and decoupling inner loop portion 74b.In addition, at this by making decoupling inner loop portion 72b relative with decoupling inner loop portion 74b, carry out the decoupling of non-conterminous element 72 and element 74, even if but by not arranging decoupling inner loop portion 72b and decoupling inner loop portion 74b, and allow a part of decoupling main ring portion 72a and decoupling main ring portion 74a overlap, also can carry out decoupling.
Figure 12 is the figure of the part representing the whole-body coil device be made up of multiple unit.Each unit has multiple element, overlaps carry out decoupling by allowing the part between the adjacent element 82 of unit 81A and element 83.In addition, decoupling is carried out by also allowing the part between the element 83 and the element 84 of unit 81B of unit 81A overlap.And when being whole-body coil device, because be not limited to the camera site by patient, the unit 81A ground connection that is connected with unit 81B is used, so be connected to form the such element of ring not by unit 81A and unit 81B.
In addition, the element 82 of unit 81A possesses decoupling ring portion 82A, by being overlapped with element 84 part of unit 81B by this decoupling ring portion 82A, carries out the decoupling between non-conterminous element 82 and element 84.And, at this, although allow decoupling ring portion 82A overlap with element 84 part of unit 81B, as shown in figure 11, also the mode can intersected with the inner loop portion of a side and main ring portion arranges main ring portion and the inner loop portion of decoupling on each element, and by relative configuration, inner loop portion carries out decoupling.
Figure 13 represents in the whole-body coil device be made up of multiple unit, at the figure of non-conterminous another decoupling example interelement.Also be carry out decoupling at adjacent interelement by allowing a part overlap in this example embodiment.On the other hand, at non-conterminous interelement, each element arranges decoupling ring portion, overlap by allowing decoupling ring portion and carry out decoupling.Such as, element 91 has decoupling ring portion 91a, by overlapping by a ring portion 93a part with the decoupling of element 93, carries out the decoupling between element 91 and element 93.And, at this, be allow a part between decoupling ring portion overlap, but as shown in figure 11, the mode also can intersected with the inner loop portion of a side and main ring portion arrange main ring portion and the inner loop portion of decoupling on each element, and by relative configuration, inner loop portion carries out decoupling.
Figure 14 is the figure of a part for other the coil device represented containing multiple element.Also be carry out decoupling at adjacent interelement by allowing a part overlap in this example embodiment.Such as, the decoupling between adjacent element 96 and element 97 and the decoupling between adjacent element 97 and element 98 are undertaken by allowing a part overlap.On the other hand, at non-conterminous interelement, each element arranges decoupling ring, overlap by allowing decoupling ring portion and carry out decoupling.Such as, element 96 and 98 has decoupling ring portion 96a and 98a respectively, to overlap the decoupling carried out between element 96 and element 98 by allowing a part of decoupling ring portion 96a and 98a.And at this, although allow a part between decoupling ring portion overlap, as shown in figure 11, the mode also can intersected with the inner loop portion of a side and main ring portion arranges main ring portion and the inner loop portion of decoupling on each element, carries out decoupling by relatively configuring inner loop portion.
Further effect and version are easily exported to those skilled in the art.Thus, the form of wider model of the present invention is not limited to above-mentioned to represent and the specifically detailed and representational embodiment illustrated like that.Thus, do not depart from additional claim and the concept of total invention that defines with its equivalent and spirit or scope, various change can be had.

Claims (7)

1. a RF coil, Unit the 1st of connected/separated and Unit the 2nd can be configured with the multiple key element coils received from the magnetic resonance signal of subject respectively, it is characterized in that:
The 1st inner loop that the 1st key element coil as at least one the key element coil in multiple key element coils of above-mentioned Unit the 1st has the 1st main ring and is connected in series with the 1st main ring,
The 2nd key element coil as at least one the key element coil in multiple key element coils of above-mentioned Unit the 2nd there is the 2nd main ring and be connected in series with the 2nd main ring and with above-mentioned 1st inner loop above-mentioned can relative and contrary with the coiling direction of above-mentioned 1st inner loop the 2nd inner loop of the part of connected/separated
The reception that above-mentioned Unit the 1st and Unit the 2nd configure respectively is adjacent with above-mentioned 2nd key element coil with above-mentioned 1st key element coil respectively from the 3rd key element coil in multiple key element coils of the magnetic resonance signal of subject, under the state that above-mentioned Unit the 1st and Unit the 2nd link, the 3rd main ring is formed via electrical cnnector
Above-mentioned 1st key element coil and above-mentioned 2nd key element coil use above-mentioned 1st inner loop and above-mentioned 2nd inner loop to carry out uncoupling between two key element coils,
Above-mentioned 1st key element coil and above-mentioned 2nd key element coil and above-mentioned 2nd key element coil and above-mentioned 3rd key element coil assign to carry out uncoupling between two key element coils respectively by arranging coincidence part,
This RF coil has the maintaining part for keeping above-mentioned 1st inner loop and the relative position relationship of above-mentioned 2nd inner loop.
2. RF coil according to claim 1, is characterized in that: in the magnetic field occurred above-mentioned 1st inner loop and above-mentioned 2nd inner loop are to flow through the key element coil of a side during at electric current, become the mode generation induction electromotive force of 0 with the summation in the magnetic field of the key element coil interlinkage of the opposing party.
3. RF coil according to claim 1, is characterized in that: above-mentioned 1st inner loop and above-mentioned 2nd inner loop are to make in the induction electromotive force that occurs the inner loop of the opposing party to the magnetic flux of interlinkage in the inner loop of the opposing party in the inner loop of a side and the main ring from a side mutually contrary to the induction electromotive force direction that the magnetic flux of interlinkage in the main ring of the opposing party occurs in the main ring of the opposing party and above-mentioned induction electromotive force occurs size is identical mode.
4. RF coil according to claim 1, it is characterized in that: above-mentioned 1st inner loop is made up of to the ring turned back in the roughly orthogonal direction of arrangement plane the end of the 2nd key element coil side from above-mentioned 1st main ring, above-mentioned 2nd inner loop by be arranged on above-mentioned 2nd main ring the 1st key element coil side end cross part and to link with this cross part and the ring relative with above-mentioned 1st inner loop is formed.
5. RF coil according to claim 1, is characterized in that: above-mentioned 1st inner loop and above-mentioned 2nd inner loop form コ font.
6. RF coil according to claim 1, it is characterized in that: above-mentioned 1st inner loop is formed towards the 1st winder being aligned to column direction and arranging central shaft by the 2nd key element coil side of above-mentioned 1st main ring, above-mentioned 2nd inner loop by be arranged on above-mentioned 2nd main ring the 1st key element coil side above-mentioned 1st winder extended line on the 2nd winder form.
7. a MRI device, is characterized in that:
Possesses RF coil according to claim 1.
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