CN104473644A - Coil control system and head and neck combined coil for magnetic resonance imaging - Google Patents
Coil control system and head and neck combined coil for magnetic resonance imaging Download PDFInfo
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- CN104473644A CN104473644A CN201410854627.3A CN201410854627A CN104473644A CN 104473644 A CN104473644 A CN 104473644A CN 201410854627 A CN201410854627 A CN 201410854627A CN 104473644 A CN104473644 A CN 104473644A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
Abstract
The invention discloses a coil control system and head and neck combined coil for magnetic resonance imaging. The coil control system comprises a plurality of communication links, each communication link comprises a coil, a control circuit and a common mode choke ring, wherein the coil is connected with the control circuit, and the control circuit is connected with the common mode choke ring. Each control circuit comprises a match circuit, a phase-shift circuit and an amplifier, wherein the phase-shift circuit is in series connection with the match circuit and the amplifier, the match circuit is connected with the coil, and the amplifier is connected with the common mode choke ring. The head and the neck can be covered with the coil control system and the head and neck combined coil for magnetic resonance imaging, so high SNR and images with high resolution can be obtained, and simultaneous imaging on the head and the neck can be achieved; in addition, flexible structure design is adopted in a neck unit, and a coil unit of the neck can be adaptively bent for different patients, so it is guaranteed that the coil can be tightly attached to the necks of the patients, and imaging quality is improved.
Description
Technical field
The present invention relates to nuclear magnetic resonance, particularly relate to the coil control system for nuclear magnetic resonance and head and neck associating coil.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) is nuclear magnetic resonance, NMR (NuclearMagnetic Resonance, NMR) important application medically.The main magnetic system of nuclear magnetic resonance can produce homogeneous main magnetic field, makes the hydrogen nuclei in human body issue raw spin polarization in main field, and the hydrogen nuclei of magnetic polarization spins and produces magnetic moment in human body.When not having external magnetic field to encourage, this magnetic moment is in stable state, and the direction of magnetic moment is coaxial with the direction of main field, can not carry out effective imaging.As additional uniform radio frequency (RadioFrequency, RF), during magnetic field, in human body, magnetic moment is subject to excitation and produces NMR signal, gathers NMR signal by coil, again after electric-control system conversion, final medical data and the image obtaining measurand diseased region.
In order to improve visual field and the signal to noise ratio of nuclear magnetic resonance, accelerate image taking speed.Magnetic resonance radio frequency module adopts multi-channel radio frequency receiving coil usually, and each radio-frequency coil unit receives the magnetic resonance signal in imaging space by electromagnetic induction, the corresponding receive path of the magnetic resonance signal that each radio-frequency coil unit receives.In the ideal case, the alternating magnetic field that each radio-frequency coil unit produces is independently, and the alternating magnetic field that in radio-frequency coil unit, any two radio-frequency coil unit produce does not affect each other.But in actual applications, coupling phenomenon may occur between two radio-frequency coil unit, especially for adjacent radio-frequency coil unit, coupling phenomenon is particularly outstanding, this reduces the signal to noise ratio of Multi-channel radio-frequency coil.
At present, in clinical practice, the port number that may be used for radio-frequency coil reception in MRI system is generally less than and equals 32 passages, and in some clinical magnetic resonance detects, blood vessel wall imaging as outer in intracranial, need to detect head and cervical region, investigative range is comparatively large simultaneously, to such an extent as to need the image obtained should have higher resolution could as the foundation of clinical diagnosis.Particularly, traditional radio-frequency coil comprises 32 channel head coils, 16 passage head and neck associating coil and 36 passage head-neck-chest coils.Wherein, the shell of 32 channel head coils adopts helmet-type design, the coil of each unit is made to be close to head, obtain the image of high s/n ratio and resolution, but the search coverage of radio-frequency coil exists blind spot, can not effectively detect, the imaging while of cannot carrying out head and cervical region, causes obtaining diagnostic image accurately; 16 passage head and neck associating coils adopt 12 passages to gather at head, adopt 4 passages to gather, can obtain the image of head and cervical region simultaneously at cervical region, but, the signal to noise ratio obtained is often lower, and head image resolution is lower, can not provide medical image clearly for clinical diagnosis; 36 passage head-neck-chest coil investigative ranges are comparatively large, obtain the image of head, cervical region and chest, but the signal to noise ratio of acquisition are often lower, and head image resolution is lower, can not provide medical image clearly for clinical diagnosis simultaneously.
Summary of the invention
The present invention solves the technical problem existed in prior art, a kind of coil control system for nuclear magnetic resonance and head and neck associating coil are provided, the signal to noise ratio obtained when improving scanning and image resolution ratio, realize detecting the head of patient and cervical region simultaneously, improve image quality.
A kind of coil control system for nuclear magnetic resonance, comprise some communication links, each described communication link includes coil, control circuit and common mode chokes ring, described coil connects described control circuit, and described control circuit connects described common mode chokes ring, wherein, described control circuit comprises match circuit, phase-shift circuit and amplifier, described phase-shift circuit is connected described match circuit and amplifier, and match circuit is connected with coil, and amplifier is connected with common mode chokes ring.
Further, tuning capacity and diode is provided with in described coil.
Further, the frequency of described tuning capacity is 123.2MHz, and described diode is PIN type diode.
Further, described match circuit inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm.
Further, described phase-shift circuit inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm.
Further, the quantity of described communication link is 32.
Head and neck associating coil, comprise pedestal and head and neck associating coil, described pedestal comprises inner chamber, described head and neck associating coil comprises several head units and several neck unit, the quantity of described head unit is 24, head unit described in each is all close on the inner chamber of described pedestal, and the quantity of described neck unit 8, neck unit described in each is all close on the inner chamber of described pedestal.
Further, described inner chamber comprises head chamber and cervical region chamber, and described head unit is arranged at described head chamber, and described neck unit is arranged at described cervical region chamber.
Further, described head unit and described neck unit adopt overlapping mode to be connected.
Further, described head unit is solid shape structure, and described neck unit is flexible structure.
Beneficial effect of the present invention:
In sum, a kind of coil control system for nuclear magnetic resonance provided by the invention and head and neck associating coil, by the coil unit quantity of reasonable distribution head and cervical region, the coil position of head and cervical region is rationally set, make coil can cover head and cervical region simultaneously, obtain high s/n ratio and higher image in different resolution, the imaging while of realizing carrying out head and cervical region; In addition, in order to ensure that neck unit can be close to imaging position, neck unit adopts flexible structure design, and for different patients, the coil unit of cervical region can carry out adaptive curved, ensures that coil can fit tightly patient's cervical region, improves image quality.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention for the coil control system of nuclear magnetic resonance.
Fig. 2 is the structural representation of embodiment of the present invention head and neck associating coil.
Detailed description of the invention
In order to set forth technical characterstic of the present invention and structure better, be described in detail below in conjunction with the preferred embodiments of the present invention and accompanying drawing thereof.
Consult Fig. 1, a kind of coil control system for nuclear magnetic resonance, comprise some communication links, each communication link includes coil 11, control circuit 10 and common mode chokes ring 19, coil 11 connection control circuit 10, control circuit 10 connects common mode chokes ring 19, wherein, control circuit 10 comprises match circuit 13, phase-shift circuit 15 and amplifier 17, and phase-shift circuit 15 is connected match circuit 13 and amplifier 17, match circuit 13 is connected with coil 11, and amplifier 17 is connected with common mode chokes ring 19.
Particularly, the quantity of communication link is 32; Be provided with tuning capacity and diode in coil 11, the frequency of this tuning capacity is 123.2MHz, and this diode is PIN type diode; Match circuit 13 inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm; Phase-shift circuit 15 inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm.It should be noted that, the coil 11 in whole communication link is tuned to system resonance frequency by tuning capacity by this coil 11.This amplifier 17 is preamplifier 17, system by match circuit 13 and phase-shift circuit 15 by impedance matching to preamplifier 17, obtain optimum noise resistance, the noise resistance of its optimum is 50 ohm, simultaneously, coil 11 in each communication link is all connected with the amplifier 17 of low input impedance, realizes the effect improving coil 11 decoupling zero.This PIN type diode helps control system to carry out off resonance when coil 11 is launched, and the direct current supply of PIN type diode can be provided by magnetic resonance system.In addition, coil 11 is connected with control circuit 10, controls to be connected with common mode chokes ring 19, and this common mode chokes ring 19, for suppressing the common mode current on coil 11, makes coil 11 obtain high s/n ratio.
The present embodiment also provides the head and neck associating coil 20 of this control system of application, comprise pedestal 30 and head and neck associating coil 20, wherein, pedestal 30 comprises inner chamber, head and neck associating coil 20 comprises several head unit 21 and several neck unit 22, and the quantity of head unit 21 is 24, and each head unit 21 is all close on the inner chamber of pedestal 30, the quantity of neck unit 22 8, each neck unit 22 is all close on the inner chamber of pedestal 30.
Particularly, inner chamber comprises head chamber 31 and cervical region chamber 32, and head unit 21 is arranged at head chamber 31, and neck unit 22 is arranged at cervical region chamber 32; Head unit 21 and neck unit 22 adopt overlapping mode to be connected; Head unit 21 is solid shape structure, and neck unit 22 is flexible structure.It should be noted that, head unit 21 and neck unit 22 are close on inner chamber, form search coverage, and head unit 21 is fixed on this head chamber 31 in geometry, when the head of patient is positioned at head chamber 31, head unit 21 can not change shape with patients head's difference; And neck unit 22 is flexible structure, when patient accepts scanning, the cervical region of patient is positioned at cervical region chamber 32, and between different patient, neck unit 22 can suitably bend, and ensures that coil and patient's cervical region fit tightly.In addition, overlapping mode is adopted to be connected between head unit 21 with neck unit 22, overlapping type connection can help head unit 21 and neck unit 22 to carry out decoupling zero respectively, when each coil is connected with the amplifier 17 of low input impedance, the effect of decoupling zero can be improved further, improve the ability that coil obtains signal to noise ratio, realize carrying out imaging to head and cervical region simultaneously.The present embodiment, through clinical trial certificate, in the enterprising line scanning of 3T magnetic resonance system, carries out imaging to head and cervical region simultaneously, and the resolution obtaining the outer arterial images of three-dimensional intracranial reaches 0.6mm × 0.6mm × 0.6mm, meets Clinical practice requirement.
In sum, a kind of coil control system for nuclear magnetic resonance provided by the invention and head and neck associating coil, by the coil unit quantity of reasonable distribution head and cervical region, the coil position of head and cervical region is rationally set, make coil can cover head and cervical region simultaneously, obtain high s/n ratio and higher image in different resolution, the imaging while of realizing carrying out head and cervical region; In addition, in order to ensure that neck unit can be close to imaging position, neck unit adopts flexible structure design, and for different patients, the coil unit of cervical region can carry out adaptive curved, ensures that coil can fit tightly patient's cervical region, improves image quality.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, other multi-form change or variations can also be made on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (10)
1. the coil control system for nuclear magnetic resonance, comprise some communication links, each described communication link includes coil (11), control circuit (10) and common mode chokes ring (19), described coil (11) connects described control circuit (10), described control circuit (10) connects described common mode chokes ring (19), it is characterized in that, described control circuit (10) comprises match circuit (13), phase-shift circuit (15) and amplifier (17), described phase-shift circuit (15) is connected described match circuit (13) and amplifier (17), match circuit (13) is connected with coil (11), amplifier (17) is connected with common mode chokes ring (19).
2. the coil control system for nuclear magnetic resonance according to claim 1, is characterized in that, described coil is provided with tuning capacity and diode in (11).
3. the coil control system for nuclear magnetic resonance according to claim 2, is characterized in that, the frequency of described tuning capacity is 123.2MHz, and described diode is PIN type diode.
4. the coil control system for nuclear magnetic resonance according to claim 1, is characterized in that, described match circuit (13) inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm.
5. the coil control system for nuclear magnetic resonance according to claim 1, is characterized in that, described phase-shift circuit (15) inside at least comprises inductance and electric capacity, for generation of the noise resistance of 50 ohm.
6. the coil control system for nuclear magnetic resonance according to claim 1, is characterized in that, the quantity of described communication link is 32.
7. as described in claim 1 to 6, the head and neck of system combines coil, it is characterized in that, comprise pedestal (30) and head and neck associating coil (20), described pedestal (30) comprises inner chamber, described head and neck associating coil (20) comprises several head units (21) and several neck unit (22), the quantity of described head unit (21) is 24, head unit described in each (21) is all close on the inner chamber of described pedestal (30), the quantity of described neck unit (22) 8, neck unit described in each (22) is all close on the inner chamber of described pedestal (30).
8. head and neck associating coil according to claim 7, it is characterized in that, described inner chamber comprises head chamber (31) and cervical region chamber (32), described head unit (21) is arranged at described head chamber (31), and described neck unit (22) is arranged at described cervical region chamber (32).
9. head and neck associating coil according to claim 8, it is characterized in that, described head unit (21) adopts overlapping mode to be connected with described neck unit (22).
10. head and neck associating coil according to claim 9, it is characterized in that, described head unit (21) is solid shape structure, and described neck unit (22) is flexible structure.
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Cited By (10)
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| CN105487030A (en) * | 2016-01-13 | 2016-04-13 | 深圳市特深电气有限公司 | Head-and-neck multichannel RF coil device for nuclear magnetic resonance imaging system |
| CN107356891A (en) * | 2016-05-09 | 2017-11-17 | 上海联影医疗科技有限公司 | A kind of head coil component for magnetic resonance imaging |
| CN108594145A (en) * | 2018-05-03 | 2018-09-28 | 北京清影华康科技有限公司 | Modular joint imaging coil |
| CN108828478A (en) * | 2018-07-05 | 2018-11-16 | 北京清影华康科技有限公司 | Head-neck-chest joint imaging coil block |
| CN109387797A (en) * | 2018-10-17 | 2019-02-26 | 江阴万康医疗科技有限公司 | Cranium neck one vascular plaque imaging coil |
| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
| US20200249289A1 (en) * | 2019-01-31 | 2020-08-06 | Sino Canada Health Engineering Research Institute (Hefei) Ltd. | Moveable MRI System RF Coil Arrangement |
| CN111610477A (en) * | 2019-01-31 | 2020-09-01 | 中加健康工程研究院(合肥)有限公司 | Mobile MRI system with improved RF coil |
| CN112557976A (en) * | 2019-09-26 | 2021-03-26 | 上海联影医疗科技股份有限公司 | Head and neck coil and magnetic resonance system |
| US11397229B2 (en) | 2019-03-14 | 2022-07-26 | Shanghai United Imaging Healthcare Co., Ltd. | Local coil apparatus for magnetic resonance imaging |
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| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
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| CN109387797A (en) * | 2018-10-17 | 2019-02-26 | 江阴万康医疗科技有限公司 | Cranium neck one vascular plaque imaging coil |
| US20200249289A1 (en) * | 2019-01-31 | 2020-08-06 | Sino Canada Health Engineering Research Institute (Hefei) Ltd. | Moveable MRI System RF Coil Arrangement |
| CN111610477A (en) * | 2019-01-31 | 2020-09-01 | 中加健康工程研究院(合肥)有限公司 | Mobile MRI system with improved RF coil |
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| US11397229B2 (en) | 2019-03-14 | 2022-07-26 | Shanghai United Imaging Healthcare Co., Ltd. | Local coil apparatus for magnetic resonance imaging |
| US11733327B2 (en) | 2019-03-14 | 2023-08-22 | Shanghai United Imaging Healthcare Co., Ltd. | Local coil apparatus for magnetic resonance imaging |
| CN112557976A (en) * | 2019-09-26 | 2021-03-26 | 上海联影医疗科技股份有限公司 | Head and neck coil and magnetic resonance system |
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Effective date of registration: 20230221 Address after: 201807 2258 Chengbei Road, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 1068 No. 518055 Guangdong city in Shenzhen Province, Nanshan District City Xili University School Avenue Patentee before: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY CHINESE ACADEMY OF SCIENCES |