CN102692611B - Radio frequency receiving coil for nuclear magnetic resonance imager - Google Patents
Radio frequency receiving coil for nuclear magnetic resonance imager Download PDFInfo
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- CN102692611B CN102692611B CN201210210801.1A CN201210210801A CN102692611B CN 102692611 B CN102692611 B CN 102692611B CN 201210210801 A CN201210210801 A CN 201210210801A CN 102692611 B CN102692611 B CN 102692611B
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- coil
- radio frequency
- receiving coil
- frequency receiving
- layer
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Abstract
The invention discloses a radio frequency receiving coil for a nuclear magnetic resonance imager, which has the advantages of improved and simple structure and good imaging effect. The receiving coil is a phased array coil; a covering layer is arranged on the upper surface of the multi-channel phased array coil; the covering layer is divided into three layers including an upper layer, a middle layer and a lower layer; the upper layer is a coil formed by a plurality of quarter-wavelength copper strips; the lower layer refers to a plurality of parallel copper belts, which are distributed along a width direction of the copper strip on the upper layer; and the middle layer is a foam plastic layer.
Description
Technical field
The present invention relates to NMR imaging instrument, specifically a kind of radio-frequency coil of NMR imaging instrument device.
Background technology
The radio-frequency coil of NMR imaging instrument adopts body coil as the transmitting coil of radiofrequency signal conventionally, and hyperchannel phased-array coil is as the receiving coil of radiofrequency signal.This parallel imaging technique can improve the signal to noise ratio (S/N ratio) of NMR imaging instrument picture signal greatly.Yet human body is very large on the inhomogeneity impact of the radio frequency electromagnetic field of transmitting coil, this is because human body itself is exactly an electric conductor.Electric conductor has direct relation to the unevenness of the radio frequency electromagnetic field B1 of coil after putting into coil.In addition, human body is the equal of again a resistance, and electromagnetic wave can produce decay at inside of human body and die down gradually from outside to inside.These have all caused final imaging effect variation.
Summary of the invention
Technical matters to be solved by this invention is to provide the radio frequency receiving coil of the NMR imaging instrument that a kind of architecture advances is simple, imaging effect is good.
The radio frequency receiving coil of a kind of NMR imaging instrument of the present invention, described receiving coil is phased-array coil, at described phased-array coil upper surface, be provided with overlayer, this overlayer is divided into three layers of upper, middle and lowers, it is the coil of being constructed by several quarter-wave fine copper copper strips at the middle and upper levels, lower floor is the some copper strips that distribute along upper copper bandwidth direction, and centre is foam layer.
As improvement of the present invention, described phased-array coil is consisted of mutual stack 4 parallel single channel coils, adds a bandpass filter in each single channel coil.
As a further improvement on the present invention, in each single channel coil, add a prime amplifier.Between prime amplifier and coil, when in emission state, between diode current flow coil and prime amplifier, form a resonant circuit and stop signal to enter prime amplifier and suppress the signal interaction between coil and coil.
For aforesaid two problems, the present invention adopts on receiving coil as increasing an overlayer.Be equivalent to add one deck conductor coils between transmitting coil and human body, by adding this layer of conductor coils, thereby the emission efficiency of raising radio-frequency coil distributes with the electromagnetic field B1 that improves radio-frequency coil.In addition, among each coil of receiving coil, increase a high resistance (wave filter) thus can reduce the coil that produces due to radio frequency electromagnetic field and the interference between coil.
Accompanying drawing explanation
Fig. 1 is phased-array coil overlayer in the present invention,
Fig. 2 is the circuit diagram of phased-array coil in the present invention,
Fig. 3 is the comparison diagram that adopts the present invention (left side) and prior art (right side) imaging effect.
Embodiment
The radio frequency receiving coil that the invention discloses a kind of NMR imaging instrument, comprises transmitting coil and receiving coil, and wherein transmitting coil adopts body coil, and receiving coil adopts hyperchannel phased-array coil.As shown in Figure 1, core of the present invention is to be provided with overlayer at hyperchannel phased-array coil upper surface, this overlayer is divided into three layers of upper, middle and lowers, it is the coil of being constructed by several quarter-wave copper strips at the middle and upper levels, lower floor is the some parallel copper strips distributing along upper copper bandwidth direction, and centre is foam layer.As Fig. 2, hyperchannel phased-array coil below overlayer is consisted of mutual stack 4 parallel single channel coils, each coil is an independently resonant circuit, and by fixed capacity, it is the resonator of 128MHz that coil and variable capacitance form resonant frequency.Each single channel coil connects a prime amplifier, and adds a wave filter to form high resistance, by adding high resistance can effectively reduce the phase mutual interference between the coil producing due to launching site.The centre frequency of wave filter is also 128MHz.Wave filter is by electric capacity, and inductance and diode form.The overlap distance of coil and coil will reach the resonance signal overlaid of coil and coil.The width of copper strips is 0.7cm.Each extend outwards of both sides coil 5cm then 90 degree is folding.
As Fig. 3, the present invention's 4 passage phased-array coils have the dry S/N of ratio of higher image than Siemens's 4 passage phased-array coils under identical experiment condition., the contrast of the image that the cardiac image obtaining from the known left side of image effect coil of the present invention obtains than left side Siemens coil is more clear, and picture quality is better.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (4)
1. the radio frequency receiving coil of a NMR imaging instrument, described receiving coil is phased-array coil, it is characterized in that, at described phased-array coil upper surface, be provided with overlayer, this overlayer is divided into three layers of upper, middle and lowers, it is the coil of being constructed by several quarter-wave fine copper copper strips at the middle and upper levels, and lower floor is that centre is foam layer along some copper strips of the wide direction distribution of upper coil.
2. the radio frequency receiving coil of NMR imaging instrument according to claim 1, is characterized in that, described phased-array coil is consisted of mutual stack several parallel single channel coils, adds a bandpass filter in each single channel coil.
3. the radio frequency receiving coil of NMR imaging instrument according to claim 2, is characterized in that, described each single channel coil connects a prime amplifier.
4. the radio frequency receiving coil of NMR imaging instrument according to claim 3, is characterized in that, is added with a fuse and plays current-limiting protection circuit effect between prime amplifier and single channel coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210210801.1A CN102692611B (en) | 2012-06-26 | 2012-06-26 | Radio frequency receiving coil for nuclear magnetic resonance imager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210210801.1A CN102692611B (en) | 2012-06-26 | 2012-06-26 | Radio frequency receiving coil for nuclear magnetic resonance imager |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102692611A CN102692611A (en) | 2012-09-26 |
| CN102692611B true CN102692611B (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210210801.1A Expired - Fee Related CN102692611B (en) | 2012-06-26 | 2012-06-26 | Radio frequency receiving coil for nuclear magnetic resonance imager |
Country Status (1)
| Country | Link |
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| CN (1) | CN102692611B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0467845A (en) * | 1990-07-09 | 1992-03-03 | Hitachi Medical Corp | High frequency coil of magnetic resonance imaging device |
| CN1085767A (en) * | 1992-10-22 | 1994-04-27 | 广东威达医疗器械集团公司 | Medical instrument with even magnetic field |
| CN1938600A (en) * | 2004-03-29 | 2007-03-28 | 皇家飞利浦电子股份有限公司 | System for magnetic resonance imaging |
| CN101126800A (en) * | 2006-08-16 | 2008-02-20 | 西门子（中国）有限公司 | HIFU compatibe MRI radio frequency signal receiving coil and its receiving method |
| CN101236238A (en) * | 2007-01-31 | 2008-08-06 | 西门子公司 | Arrangement for radiation of a radio-frequency field |
| CN101297211A (en) * | 2005-10-28 | 2008-10-29 | 皇家飞利浦电子股份有限公司 | Non-cylindrical RF coil for MRI |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6400154B2 (en) * | 2000-01-05 | 2002-06-04 | National Research Council Of Canada | Multiple tunable double ring surface coil with high B1 homogeneity |
-
2012
- 2012-06-26 CN CN201210210801.1A patent/CN102692611B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0467845A (en) * | 1990-07-09 | 1992-03-03 | Hitachi Medical Corp | High frequency coil of magnetic resonance imaging device |
| CN1085767A (en) * | 1992-10-22 | 1994-04-27 | 广东威达医疗器械集团公司 | Medical instrument with even magnetic field |
| CN1938600A (en) * | 2004-03-29 | 2007-03-28 | 皇家飞利浦电子股份有限公司 | System for magnetic resonance imaging |
| CN101297211A (en) * | 2005-10-28 | 2008-10-29 | 皇家飞利浦电子股份有限公司 | Non-cylindrical RF coil for MRI |
| CN101126800A (en) * | 2006-08-16 | 2008-02-20 | 西门子（中国）有限公司 | HIFU compatibe MRI radio frequency signal receiving coil and its receiving method |
| CN101236238A (en) * | 2007-01-31 | 2008-08-06 | 西门子公司 | Arrangement for radiation of a radio-frequency field |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102692611A (en) | 2012-09-26 |
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