CN102707249A - Radio frequency coil of nuclear magnetic resonance imaging device - Google Patents
Radio frequency coil of nuclear magnetic resonance imaging device Download PDFInfo
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- CN102707249A CN102707249A CN2012102258095A CN201210225809A CN102707249A CN 102707249 A CN102707249 A CN 102707249A CN 2012102258095 A CN2012102258095 A CN 2012102258095A CN 201210225809 A CN201210225809 A CN 201210225809A CN 102707249 A CN102707249 A CN 102707249A
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Abstract
The invention discloses a radio frequency coil of a nuclear magnetic resonance imaging device, which is of a high signal to noise ratio and can strengthen the uniformity degree of a radio-frequency electromagnetic field B1, wherein the radio frequency coil comprises a multi-channel emitting coil and a multi-channel receiving coil, and each coil of the multi-channel receiving coil is a concentric double coil. According to the radio frequency coil of the nuclear magnetic resonance imaging device disclosed by the invention, the coils are mutually partially superposed with other surrounding coils to suppress interference.
Description
Technical field
The present invention relates to the NMR imaging instrument device, specifically is a kind of radio-frequency coil of NMR imaging instrument device.
Background technology
(Magnetic Resonance Imaging is really not have the wound imaging technique MRI), does not relate to ionising radiation in magnetic resonance imaging.MRI can provide the soft tissue structure of very detailed human body.With respect to other imaging technique, CT for example, PET, X-ray, ultrasonic etc., MRI discerns tissue abnormalities and pathology more easily, and this is MRI irreplaceable advantage in disease early diagnosis and therapy effect.MRI not only provides pathological tissues, can also reflect Physiology and biochemistry information in biological tissue function and the metabolic process.These special advantages make mr techniques be widely used in the every field of medical science and bio-pharmaceuticals in the past in three more than ten years.This technology has improved the ability of disease being carried out early diagnosis, thereby alleviates patient's the misery treatment cost a large amount of with saving.
The fundamental purpose of medical imaging technology development is the high sensitivity of pursuing Human Physiology and pathological change detection; This just need improve the time and the spatial resolution of image; Improve signal to noise ratio (S/N ratio). recent years, both direction most important and with fastest developing speed in the MRI technical research is: (1) higher static field intensity; (2) parallel imaging of phased matrix coils.General phased array matrix coils is to be made up of the surperficial receiving coil of the individual pen of the body coil of an emission and a plurality of mutual superposition.How on phased matrix coils structure, seeking the breach, being implemented in the performance of the certain situation raising magnetic resonance imager of field intensity and the performance of phased matrix coils is that those skilled in the art pay close attention to.
Summary of the invention
Technical matters to be solved by this invention provides the dry ratio of a kind of high letter, can strengthen the radio-frequency coil of NMR imaging instrument device of the uniformity coefficient of radio frequency electromagnetic field B1, and this radio-frequency coil can improve the performance of phased matrix coils in the certain situation of field intensity.
The radio-frequency coil of a kind of NMR imaging instrument device device of the present invention comprises the hyperchannel receiving coil, and each coil of said hyperchannel receiving coil is concentric twin coil.
In order to suppress to disturb, each coil is all overlapped with other coil on every side each other.
The present invention adopts the body coil of an emission, and the surperficial receiving coil of two circles of a plurality of mutual superposition constitutes, and can improve the acknowledge(ment) signal intensity about 2 times in theory.Finally reach time and the spatial resolution that improves magnetic resonance imager through the performance that improves coil.
Beneficial effect of the present invention such as Fig. 4; Under identical experiment condition; By the design sketch (figure below) that Siemens Flex Large 6 (A 3T Tim Coil) imaging effect figure (last figure) that coil obtained and coil of the present invention are obtained, visible imaging effect of the present invention improves a lot than prior art in the details performance, has shown higher MRI signal to noise ratio (S/N ratio); Image is even, and the uniformity coefficient of visible radio frequency electromagnetic field B1 is improved.
Description of drawings
Fig. 1 is a planar development synoptic diagram of the present invention,
Fig. 2 is the theoretical calculation model of hyperchannel coil,
Fig. 3 is the circuit diagram of RF receiving system,
Fig. 4 is prior art and imaging effect figure of the present invention,
Fig. 5 is the circuit structure diagram of coil of the present invention, and wherein receiving coil is a twin coil, and each twin coil is overlapped,
Fig. 6 is the overlayer of coil of the present invention, and it is formed by 3 layers and covers on the present invention.
Embodiment
As shown in Figure 1, the radio frequency hyperchannel receiving coil of NMR imaging instrument device of the present invention is made up of a plurality of coils, and each coil is concentric twin coil.In order to suppress to disturb, each coil is all overlapped with other coils on every side each other.
The coil signal to noise ratio (S/N ratio) that the present invention encloses coiling more is doubled and redoubled than the signal to noise ratio (S/N ratio) of one-turn coil in theory, and in fact we have also verified this result from experiment.Thereby decoupling between coil and the coil is through the coupled problem between the overlapping elimination of the coil coil.The circuit diagram of coil will adopt the coil design approaches of two circle coiling as shown in Figure 1.Simultaneously, during launching, the present invention will adopt imbalance and high-resistance method to eliminate the inhomogeneity influence to emission electromagnetic field B1.
Fig. 2 is the theoretical calculation model of multi-channel surface coil.According to the Theory of Electromagnetic Field of Mace Weir (Maxwell), the theoretical formula that can calculate signal to noise ratio snr is suc as formula 2.Formula (1) and formula (2) are theoretical calculation formulas, just can increase V through increasing wire circle
SigSignal intensity because coil is the just directly addition of voltage that is connected in series and produces like this.
Wherein, △ V is a body volume to be tested, M
0Be magnetic field intensity, Bt is the magnetic field intensity that unitary current produces, and k is that Blang restrains constant, and T is a kelvin rating, and △ f is a bandwidth, and R is the resistance value of coil.Fig. 3 is the structural drawing of whole receiving system.Fig. 5 is the circuit structure diagram of receiving coil among the present invention, and receiving coil of the present invention is phased matrix coils.It is to be made up of through overlapped institute 4 two turn coil.Each two turn coil all is an independently resonant circuit, and by fixed capacity, it is the resonant circuit of 128MHz that coil and variable capacitance constitute resonant frequency.The centre frequency of wave filter also is 128MHz.Wave filter is by electric capacity, and inductance and diode constitute.The overlap distance of coil and coil will reach the resonance signal overlaid of coil and coil.The width of copper strips is 1cm.These copper strips are attached on one deck ambroin plate.Fig. 6 is the overlayer of receiving coil, and during this overlayer is divided into following three layers, it is the coil of being constructed by several quarter-wave copper strips at the middle and upper levels, and lower floor is the some parallel copper strips that distributes along upper copper bandwidth direction, and the centre is a foam layer.
Whole invention receiving coil has some radians makes coil and organization of human body consistent.Transmitting coil utilizes original body coil of 3T magnetic resonance imager.When being in when transmitting, all diodes are in short-circuit condition.So just can in Fig. 5, form two wave filters.Through test to the water parody, coil of the present invention have higher signal to noise ratio (S/N ratio) than Siemens coil, as shown in Figure 4.
The concrete application approach of the present invention is a lot; The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement like conduct emission simultaneously and receiving coil, these improvement also should be regarded as protection scope of the present invention.
Claims (2)
1. the radio-frequency coil of a NMR imaging instrument device comprises the hyperchannel receiving coil, it is characterized in that, each coil of said hyperchannel receiving coil is concentric twin coil.
2. the radio-frequency coil of NMR imaging instrument device according to claim 1 is characterized in that, each coil is all overlapped with other coils on every side each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102258095A CN102707249A (en) | 2012-07-03 | 2012-07-03 | Radio frequency coil of nuclear magnetic resonance imaging device |
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| CN2012102258095A CN102707249A (en) | 2012-07-03 | 2012-07-03 | Radio frequency coil of nuclear magnetic resonance imaging device |
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| CN2012102258095A Pending CN102707249A (en) | 2012-07-03 | 2012-07-03 | Radio frequency coil of nuclear magnetic resonance imaging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412271A (en) * | 2013-05-08 | 2013-11-27 | 深圳市特深电气有限公司 | Multi-channel nuclear magnetic resonance coil |
| US10330751B2 (en) | 2015-12-29 | 2019-06-25 | Shenyang Neusoft Medical Systems Co., Ltd. | Determining position of radio frequency coil in magnetic resonance imaging system |
| WO2023082038A1 (en) * | 2021-11-09 | 2023-05-19 | 深圳先进技术研究院 | Magnetic resonance coil |
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| US20030122546A1 (en) * | 2001-11-21 | 2003-07-03 | Leussler Christoph Guenther | RF coil system for a magnetic resonance imaging apparatus |
| CN101169472A (en) * | 2006-10-27 | 2008-04-30 | 株式会社东芝 | High frequency coil device |
| CN101452065A (en) * | 2007-12-04 | 2009-06-10 | 西门子（中国）有限公司 | Partial coil in magnetic resonance equipment, the magnetic resonance equipment and imaging method |
| CN101790693A (en) * | 2007-02-26 | 2010-07-28 | 皇家飞利浦电子股份有限公司 | The doubly resonant high field radio frequency surface coils that is used for magnetic resonance |
| US20110094997A1 (en) * | 2009-10-27 | 2011-04-28 | Tokyo Electron Limited | Plasma processing apparatus and plasma processing method |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6022412A (en) * | 1994-09-30 | 2000-02-08 | Lpe Spa | Epitaxial reactor, susceptor and gas-flow system |
| US6169399B1 (en) * | 1996-12-02 | 2001-01-02 | The Trustees Of Columbia University In The City Of New York | Multiple resonance superconducting probe |
| US20030122546A1 (en) * | 2001-11-21 | 2003-07-03 | Leussler Christoph Guenther | RF coil system for a magnetic resonance imaging apparatus |
| CN101169472A (en) * | 2006-10-27 | 2008-04-30 | 株式会社东芝 | High frequency coil device |
| CN101790693A (en) * | 2007-02-26 | 2010-07-28 | 皇家飞利浦电子股份有限公司 | The doubly resonant high field radio frequency surface coils that is used for magnetic resonance |
| CN101452065A (en) * | 2007-12-04 | 2009-06-10 | 西门子（中国）有限公司 | Partial coil in magnetic resonance equipment, the magnetic resonance equipment and imaging method |
| US20110094997A1 (en) * | 2009-10-27 | 2011-04-28 | Tokyo Electron Limited | Plasma processing apparatus and plasma processing method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412271A (en) * | 2013-05-08 | 2013-11-27 | 深圳市特深电气有限公司 | Multi-channel nuclear magnetic resonance coil |
| CN103412271B (en) * | 2013-05-08 | 2016-03-30 | 深圳市特深电气有限公司 | Multi-channel nuclear magnetic resonance coil |
| US10330751B2 (en) | 2015-12-29 | 2019-06-25 | Shenyang Neusoft Medical Systems Co., Ltd. | Determining position of radio frequency coil in magnetic resonance imaging system |
| WO2023082038A1 (en) * | 2021-11-09 | 2023-05-19 | 深圳先进技术研究院 | Magnetic resonance coil |
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Application publication date: 20121003 |