CN102429659A - Multichannel emission receiving head coil for high field and ultrahigh field - Google Patents
Multichannel emission receiving head coil for high field and ultrahigh field Download PDFInfo
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- CN102429659A CN102429659A CN2011102363970A CN201110236397A CN102429659A CN 102429659 A CN102429659 A CN 102429659A CN 2011102363970 A CN2011102363970 A CN 2011102363970A CN 201110236397 A CN201110236397 A CN 201110236397A CN 102429659 A CN102429659 A CN 102429659A
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Abstract
The invention relates to a multichannel emission receiving head coil for a high field and an ultrahigh field. The multichannel emission receiving head coil is characterized by comprising a coil body of which the two ends are cut through, wherein the coil body comprises two inverted-U-shaped support bodies which are arranged in parallel at a certain interval; the top of one of the support body is provided with a boss for accommodating an external reflecting mirror; a shell formed by splicing plural organic glass plates is arranged between the two support bodies; every organic glass plate is provided with a phased array surface loop; more than one decoupling capacitor is arranged between every two adjacent phased array surface loops respectively; and two view windows are symmetrically arranged on the top of the shell corresponding to the eyes of a tested person. The multichannel emission receiving head coil can be widely applied to radiofrequency emission and receiving of various magnetic resonance high field imaging systems, in particular to ultrahigh field magnetic resonance imaging systems.
Description
Technical field
The present invention relates to a kind of coil of magnetic resonance imaging system, particularly about a kind of multichannel emission receiving head coil that is used for High-Field and super high field.
Background technology
Mr imaging technique is a kind of a kind of imaging technique that does not need ray and other ionizing radiation just can produce testee's internal image; This kind imaging technique develops rapidly in recent years; It not only becomes the indispensable instrument of clinical diagnose, more becomes the means of direct observation brain cognitive activities.At present; The main bottleneck of restriction mr imaging technique development is signal to noise ratio, resolution and the image taking speed of image; The approach that addresses the above problem in the prior art mainly is to improve main field strength, improves the emission receiving function of coil and realizes that multichannel parallel imaging is to improve image taking speed.
Current High-Field (being generally 3T) and super high field (7T and more than) magnetic resonance imaging system is the technology trends that the nuclear magnetic resonance field attracts people's attention most; Compare with low (1.5T and following) magnetic resonance imaging system; High-Field and super high field magnetic resonance imaging system are greatly improved at aspects such as signal to noise ratio, signal intensity and image resolution ratios, and the 7T magnetic resonance imaging system can reach the resolution below 0.2 millimeter.But the High-Field imaging also brings many new difficult problems to need to solve.In High-Field and super high field magnetic resonance imaging system; Magnetic resonance frequency significantly increases (being directly proportional with main field); Corresponding radio frequency wavelength significantly reduces; Because testee's dielectric resonance effect causes inhomogeneities and the testee of the radio-frequency field emission taken in excess (high SAR value) to electromagnetic energy, this directly has influence on the image quality and the human body safety of magnetic resonance imaging system.Birdcage emission receiving coil with respect to traditional adopts the receiving coil of phased array surface loop can obtain higher signal noise ratio (snr) of image usually.But be to remove coupled between the phased array surface loop of conventional coil through overlapping area; Adopt such phased-array coil to carry out radio-frequency transmissions, the radio-frequency transmissions field regional area that in High-Field and super high field, obtains is (compare with adjacent area in the overlapping area zone) inadequately evenly.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide a kind of radio-frequency transmissions field evenly, guarantee human body safety and the high multichannel emission receiving head coil that is used for High-Field and super high field of signal noise ratio (snr) of image.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of multichannel emission receiving head coil that is used for High-Field and super high field; It is characterized in that: it comprises the coil body that two ends are penetrating; Said coil body comprises that two parallel interval settings are the supporter of Ω type; Wherein the top of a said supporter is provided with one and places the boss of external mirror, is provided with one between two said supporters and is combined into the shell that forms by the even numbered blocks poly (methyl methacrylate) plate, and each said poly (methyl methacrylate) plate is provided with a phased array surface loop; Add more than one decoupling capacitor respectively between the said phased array surface loop of each adjacent two, corresponding testee's eye locations is symmetrically arranged with two forms at the top of said shell.
Each said phased array surface loop comprises several fixed capacities and tunable capacitor; Between each adjacent said electric capacity, be respectively arranged with an inductance; Constitute a series connection resonant tank, an end of the tunable capacitor in said series resonant tank receives permutator through the emission that an other tunable capacitor connects in the parallel emitting and receiving radio-frequency interface circuit.
Said fixed capacity adopts the high pressure resistant fixed capacity of no magnetic, and said tunable capacitor adopts the high pressure resistant tunable capacitor of no magnetic, and said inductance covers copper by printed circuit board and constitutes.
Two adjacent phased array surface loops of said cover top portion are respectively between the frame of said two forms and poly (methyl methacrylate) plate, to connect up, and the cloth line position of other said phased array surface loop is all identical therewith.
Type of being shaped as of said shell is oval, and the distance between about said shell is 22～24cm, and the distance between up and down is 24～26cm.
Be provided with the linear phase shift device in the said parallel emitting and receiving radio-frequency interface circuit.
The present invention is owing to take above technical scheme; It has the following advantages: 1, the present invention is provided with the shell that is combined into by the even numbered blocks poly (methyl methacrylate) plate; And be provided with two symmetric forms at the top of shell; Visual pattern outside during experiment sends to respectively in testee's eyes through being fixed on the external mirror reflects on the boss and seeing through two forms, helps the testee is carried out visual stimulus clearly.2, the present invention is owing to correspondence on each piece poly (methyl methacrylate) plate of shell is provided with a phased array surface loop; And between every two adjacent phased array surface loops, add more than one electric capacity to remove mutual coupling; Remove coupled mode and compare with traditional overlapping area of passing through; Obtain uniform radio-frequency transmissions field more easily, guarantee the high s/n ratio of image.3, the present invention is because the two ends of the tunable capacitor in each series resonant tank receive permutator through the emission that another tunable capacitor connects in the parallel emitting and receiving radio-frequency interface circuit; With the warp linear dephased multi-channel rf signal of emission from parallel emitting and receiving radio-frequency interface circuit output; And the magnetic resonance signal that receives is passed through preamplifier import magnetic resonance system; And the present invention can be through regulating above two tunable capacitors; With the phase place and the impedance phase coupling of preamplifier, further improved the signal to noise ratio of image.4, shell of the present invention, inductance, fixed capacity and tunable capacitor all adopt nonmagnetic high voltage bearing mechanical material and electronic devices and components, because mechanical material does not form images in the magnetic resonance experiment, therefore can further improve signal noise ratio (snr) of image.5, shell of the present invention is owing to be the ellipsoid like structure of being processed by the even numbered blocks poly (methyl methacrylate) plate, and the shape of therefore pressing close to human body head more helps improving the signal to noise ratio of image.The present invention can be widely used in the radio-frequency transmissions and the reception of various magnetic resonance High-Field imaging systems, especially in the super high field magnetic resonance imaging system.
Description of drawings
Fig. 1 is a frame for movement sketch map of the present invention;
Fig. 2 is the distribution schematic diagram of phased array surface loop on the shell of the present invention;
Fig. 3 is that the circuit of phased array surface loop on the shell of the present invention connects sketch map;
Fig. 4 is the user mode figure of the present invention in magnetic resonance imaging system (MRI).
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1; The present invention includes a penetrating coil body 1 in two ends by the poly (methyl methacrylate) plate making; Coil body 1 comprises that two parallel interval settings are the supporter 11,12 of Ω type, the top of supporter 11 be provided with one be used for fixing external mirror 13, two supporters 11 of boss, the shell 14 that is spliced by the even numbered blocks poly (methyl methacrylate) plate is set between 12; Correspondence is provided with a surface loop on each piece poly (methyl methacrylate) plate of shell 14, and then forms multichannel phased array surface loop.Corresponding testee's eye locations is symmetrically arranged with two rectangle forms 15 on the poly (methyl methacrylate) plate at shell 14 tops.
As shown in Figure 2, eight poly (methyl methacrylate) plates of shell 14 of the present invention (with eight be example, but be not limited thereto) on be respectively arranged with a surface loop Ch1, Ch2, Ch3, Ch4, Ch5, Ch6, Ch7, Ch8, and then form eight passage phased array surface loops 16.As shown in Figure 3; Each phased array surface loop 16 comprises six fixed capacity C1, C2, C3, C4, C5, C6; Two tunable capacitor Cf, Cp; And be connected on eight inductance L 1, L2, L3, L4, L5, L6, L7, the L8 between the adjacent electric capacity at interval, and then constitute a series connection resonant tank.The end of a tunable capacitor Cp in series resonant tank receives permutator through the emission that another tunable capacitor Cs is connected in series in the parallel emitting and receiving radio-frequency interface circuit 17; Owing to have the effect of intercoupling between two adjacent phased array surface loops 16; The present invention adopts the mode of capacitor decoupling between every two adjacent phased array surface loops 16, all to add more than one capacitor C i, Ci ' (i=1,2 ... 8) to remove the mutual coupling of phased array surface loop 16.
In the foregoing description, as shown in Figure 4, shell 14 types of being shaped as of the present invention are oval, press close to the nose shape of human body more for making shape, improve imaging effect, and the distance between about shell 14 is 22～24cm, and the distance between up and down is 24～26cm.
In the foregoing description; Two adjacent phased array surface loops 16 at shell of the present invention 14 tops are respectively between the frame of two forms 15 and poly (methyl methacrylate) plate, to connect up; The cloth line position of other phased array surface loop 16 is all identical therewith, the upper and lower, left and right symmetry.In actual the use, in order to remove coupling between each adjacent phased array surface loop 16, the number and the connected mode of the coupling capacitance that each adjacent phased array surface loop 16 connects all can change.
In the foregoing description, fixed capacity C1 of the present invention, C2, C3, C4, C5, C6 can adopt the high pressure resistant fixed capacity of no magnetic, and tunable capacitor Cf, Cp, Cs can adopt the high pressure resistant tunable capacitor of no magnetic.Inductance L 1, L2, L3, L4, L5, L6, L7, L8 can cover copper by printed circuit board and constitute.
In the foregoing description; Fixed capacity C1 of the present invention, C2, C3, C4, C5, C6 cooperate tunable capacitor Cf to regulate the frequency of series resonant tank; Impedance and phase place that Cp and Cs are used for regulating phased array surface loop 16 and parallel emitting and receiving radio-frequency interface circuit 17 are complementary; In order to reach the resonant frequency of series resonant tank, the number and the connected mode of fixed capacity, tunable capacitor and inductance all can change to some extent in actual the use.In 7T super high field magnetic resonance imaging system, the resonant frequency of this series resonant tank is 297.2MHz, makes each series resonant tank have high-quality-factor like this, thereby for improving signal noise ratio (snr) of image advantageous conditions is provided.
As shown in Figure 1, in the foregoing description, being electrically connected of multichannel phased array surface loop 16 and parallel emitting and receiving radio-frequency interface circuit 17 for ease, supporter 12 is provided with eight through holes 18.
In the foregoing description; The present invention is provided with the linear phase shift device in parallel emitting and receiving radio-frequency interface circuit 17, at launching phase, adopting at interval between every two adjacent phased array surface loops 16 between the eight passage phased array surface loops 16 of the present invention, 45 ° linear phase excites multichannel phased array surface loop 16 successively; Use according to reality; If adopt the phased array surface loop 16 of other n passage, adopt the linear phase of the 360 °/n in interval to excite multichannel phased array surface loop 16 between two then adjacent phased array surface loops 16, can obtain the image of clear uniform human brain like this; Wherein, n is an even number.
The present invention cooperates parallel emission receiving interface circuit 17 to have the function of the nuclear spin of multi-channel parallel excited atom, receiving magnetic resonance signals in magnetic resonance imaging system.It is that embodiment further specifies the application of the present invention in magnetic resonance imaging system that the present invention carries out the functional MRI experiment with the brain to the testee; When carrying out the functional MRI experiment; Testee's head is placed in the coil body 1 of the present invention; Outside visual pattern is also seen through two forms 15 in testee's eyes through the external mirror reflects that is fixed on the boss 13; The corresponding brain function district of testee will obtain visual pattern to stimulate, thereby produces the function corresponding magnetic resonance signal, and its process is following:
As shown in Figure 4, the scanning interface 21 that the operator operates magnetic resonance imaging system main frame 20 is sent status signal control and is transmitted and received the switching between the state.When the emission state control signal is sent at the scanning interface 21 of operating host 20; Emission receives permutator 22 and is in emission state; Main frame 20 is described through fixed time interval, intensity, waveform and the length of the 21 pairs of radio-frequency pulses that will produce in operation scanning interface, and then control impuls sequencer 23 produces the gradient pulse of needed radio-frequency pulses and the x that matches with radio-frequency pulse, y, three directions of z.Pulse-series generator 23 sends to gradient amplifier 24 with the gradient pulse that produces; The gradient magnetic that gradient amplifier 24 produces acts on 25 pairs of magnetic resonance signals of main field and carries out space encoding; Thereby testee's head imaging region is carried out space orientation, and the scanning interface 21 of operating host 20 is ordered a system 26 for a trial to quilt and is sent instruction and combine gradient magnetic accurately to control the concrete imaging region of testee's head.Simultaneously; Pulse-series generator 23 is transmitted into radio-frequency power amplifier 28 through transceiver 27 with radio-frequency pulse and carries out the signal amplification; And the signal of telecommunication that will receive after permutator 22 will amplify through emission sends in the present invention; H proton in the present invention excites testee's head tissue makes the H proton generation magnetic resonance that is arranged in main field 25, produces faint magnetic resonance signal.
When the accepting state control signal is sent at the scanning interface 21 of operating host 20; Emission receives permutator 22 and is in accepting state; Convert the signal of telecommunication to after the faint magnetic resonance signal that excited nucleus sends is received by the present invention and be sent to preamplifier 29; Signal after preamplifier 29 amplifies sends in the transceiver 27, after interlock circuit carries out 2,3 grades of amplifications, demodulation, filtering, digitized, sends to internal memory 30 and then sends to AP 31, and 31 pairs of data messages that obtain of AP carry out image reconstruction; Image after will rebuilding at last sends to storage and display unit, and the image at testee's head imaging position is stored demonstration.
In the foregoing description, pulse-series generator 23 can also receive testee's data from physiological signal harvester 32, and these data can be used for removing the pseudo-shadow of image.
Above-mentioned each embodiment only is used to explain the present invention; Wherein wire laying mode of the structure of each parts, connected mode and circuit etc. all can change to some extent; Every equivalents of on the basis of technical scheme of the present invention, carrying out and improvement all should not got rid of outside protection scope of the present invention.
Claims (9)
1. a multichannel that is used for High-Field and super high field is launched receiving head coil; It is characterized in that: it comprises the coil body that two ends are penetrating; Said coil body comprises that two parallel interval settings are the supporter of Ω type; Wherein the top of a said supporter is provided with one and places the boss of external mirror; Be provided with one between two said supporters and be combined into the shell that forms by the even numbered blocks poly (methyl methacrylate) plate; Each said poly (methyl methacrylate) plate is provided with a phased array surface loop, adds more than one decoupling capacitor respectively between the said phased array surface loop of each adjacent two, and corresponding testee's eye locations is symmetrically arranged with two forms at the top of said shell.
2. a kind of multichannel emission receiving head coil that is used for High-Field and super high field as claimed in claim 1; It is characterized in that: each said phased array surface loop comprises several fixed capacities and tunable capacitor; Between each adjacent said electric capacity, be respectively arranged with an inductance; Constitute a series connection resonant tank, an end of the tunable capacitor in said series resonant tank receives permutator through the emission that an other tunable capacitor connects in the parallel emitting and receiving radio-frequency interface circuit.
3. a kind of multichannel emission receiving head coil that is used for High-Field and super high field as claimed in claim 2; It is characterized in that: said fixed capacity adopts the high pressure resistant fixed capacity of no magnetic; Said tunable capacitor adopts the high pressure resistant tunable capacitor of no magnetic, and said inductance covers copper by printed circuit board and constitutes.
4. like claim 1 or 2 or 3 described a kind of multichannel emission receiving head coils that are used for High-Field and super high field; It is characterized in that: two adjacent phased array surface loops of said cover top portion are respectively between the frame of said two forms and poly (methyl methacrylate) plate, to connect up, and the cloth line position of other said phased array surface loop is all identical therewith.
5. like claim 1 or 2 or 3 described a kind of multichannel emission receiving head coils that are used for High-Field and super high field; It is characterized in that: type of being shaped as of said shell is oval; Distance between about said shell is 22～24cm, and the distance between up and down is 24～26cm.
6. a kind of multichannel emission receiving head coil that is used for High-Field and super high field as claimed in claim 4 is characterized in that: type of the being shaped as ellipse of said shell, and the distance between about said shell is 22～24cm, the distance between up and down is 24～26cm.
7. like claim 1 or 2 or 3 or 6 described a kind of multichannel emission receiving head coils that are used for High-Field and super high field, it is characterized in that: be provided with the linear phase shift device in the said parallel emitting and receiving radio-frequency interface circuit.
8. a kind of multichannel emission receiving head coil that is used for High-Field and super high field as claimed in claim 4 is characterized in that: be provided with the linear phase shift device in the said parallel emitting and receiving radio-frequency interface circuit.
9. a kind of multichannel emission receiving head coil that is used for High-Field and super high field as claimed in claim 5 is characterized in that: be provided with the linear phase shift device in the said parallel emitting and receiving radio-frequency interface circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102363970A CN102429659A (en) | 2011-08-17 | 2011-08-17 | Multichannel emission receiving head coil for high field and ultrahigh field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102363970A CN102429659A (en) | 2011-08-17 | 2011-08-17 | Multichannel emission receiving head coil for high field and ultrahigh field |
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| CN102429659A true CN102429659A (en) | 2012-05-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526049A (en) * | 2017-09-13 | 2017-12-29 | 中国科学院生物物理研究所 | A kind of multinuclear metabolic imaging double frequency head coil for super high field |
| CN111123181A (en) * | 2020-01-20 | 2020-05-08 | 上海东软医疗科技有限公司 | Head and neck radio frequency coil device, scanning bed and magnetic resonance equipment |
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| CN1236895A (en) * | 1998-05-20 | 1999-12-01 | 通用电器横河医疗系统株式会社 | Phased-array coil, receive signal processing circuit, and MRI apparatus |
| US7091721B2 (en) * | 2001-04-18 | 2006-08-15 | IGC—Medical Advances, Inc. | Phased array local coil for MRI imaging having non-overlapping regions of sensitivity |
| CN101658419A (en) * | 2008-12-31 | 2010-03-03 | 深圳市美德医疗电子技术有限公司 | Projection system for magnetic resonance system |
| CN101872001A (en) * | 2010-06-29 | 2010-10-27 | 中国科学院生物物理研究所 | Parallel emitting and receiving radio-frequency interface circuit and phased array emitting and receiving head coil |
| CN202235367U (en) * | 2011-08-17 | 2012-05-30 | 中国科学院生物物理研究所 | Multi-channel transmitting and receiving head coil for high fields and ultra-high fields |
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2011
- 2011-08-17 CN CN2011102363970A patent/CN102429659A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236895A (en) * | 1998-05-20 | 1999-12-01 | 通用电器横河医疗系统株式会社 | Phased-array coil, receive signal processing circuit, and MRI apparatus |
| US7091721B2 (en) * | 2001-04-18 | 2006-08-15 | IGC—Medical Advances, Inc. | Phased array local coil for MRI imaging having non-overlapping regions of sensitivity |
| CN101658419A (en) * | 2008-12-31 | 2010-03-03 | 深圳市美德医疗电子技术有限公司 | Projection system for magnetic resonance system |
| CN101872001A (en) * | 2010-06-29 | 2010-10-27 | 中国科学院生物物理研究所 | Parallel emitting and receiving radio-frequency interface circuit and phased array emitting and receiving head coil |
| CN202235367U (en) * | 2011-08-17 | 2012-05-30 | 中国科学院生物物理研究所 | Multi-channel transmitting and receiving head coil for high fields and ultra-high fields |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526049A (en) * | 2017-09-13 | 2017-12-29 | 中国科学院生物物理研究所 | A kind of multinuclear metabolic imaging double frequency head coil for super high field |
| CN111123181A (en) * | 2020-01-20 | 2020-05-08 | 上海东软医疗科技有限公司 | Head and neck radio frequency coil device, scanning bed and magnetic resonance equipment |
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Application publication date: 20120502 |