CN102749597A - Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system - Google Patents
Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system Download PDFInfo
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- CN102749597A CN102749597A CN2012102287488A CN201210228748A CN102749597A CN 102749597 A CN102749597 A CN 102749597A CN 2012102287488 A CN2012102287488 A CN 2012102287488A CN 201210228748 A CN201210228748 A CN 201210228748A CN 102749597 A CN102749597 A CN 102749597A
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Abstract
The invention discloses a knee joint radio-frequency (RF) coil in a horizontal-field magnetic resonance system. The knee joint RF coil comprises a plurality of antenna units, wherein the number of the antenna units is greater than two, the antenna units are divided into an upper half part and a lower half part which can be separated from each other, and adjacent antenna units are partially overlapped. The knee joint RF coil in the horizontal-field magnetic resonance system, disclosed by the invention, has the advantages that the manner of connection between the upper half part and the lower half part is excellent, the quality of connection is more reliable, the decoupling effect, the sensitivity (signal-to-noise ratio) and the uniformity among the antenna units of the coil are improved, the PAT (Parallel Acquisition Technique) selectivity is flexible, and the PAT effect is excellent.
Description
Technical field
The invention belongs to the magnetic resonance imaging field, be specifically related to the knee joint radio-frequency coil in a kind of horizontal magnetic resonance system.
Background technology
Magnetic resonance system is a kind of high-end medical imaging devices, and it can be divided into horizontal magnetic resonance system and perpendicualr field magnetic resonance system according to the magnetic direction of main magnet.The level field system refers to the magnetic direction of magnet and follows people's trunk parallel, points to sole or opposite from brain.The magnetic direction that the perpendicualr field system refers to magnet is vertical with people's trunk direction, points to the back side such as the front from the people.The magnetic direction of magnet is the most important reference frame of design radio-frequency coil, and is vertical with the magnet direction as much as possible because the antenna element in the coil needs, and could obtain best radio-frequency drive or receiving function.On the performance of radio-frequency coil, sharpness (being sensitivity or signal to noise ratio (S/N ratio)) and homogeneity are two most important measurement indexs.From doctor's operation convenience and patient comfort, two parts unlatching was a very important function about the knee joint coil had, because patient's knee can be placed in the coil very easily like this.
Parallel acquisition technique in the magnetic resonance imaging (Parallel acquisition Technique is called for short PAT) also can effectively improve picture quality.Such as reducing image artifacts, accelerate image imaging speed, be extremely important a, otherwise effective technique in the magnetic resonance imaging.But the imaging effect of PAT (or ability) is except following the magnetic resonance parameters in series (like FOV; Over-sampling etc.) beyond setting, the selection of aspect, phase-encoding direction (phase encoding direction) are relevant; Also very big relation is arranged, so the coil antenna cell distribution arrangement design of knee joint coil is a key of its PAT imaging effect with the design of coil, the quantity and the positional alignment of coil antenna unit.
On at present international (containing domestic) magnetic resonance market, knee joint coil commonly used has 2 sections.A is birdcage (birdcage) knee joint coil, as shown in Figure 1; Another money is 1 * 8 knee joint coil, and its coil antenna unit copper sheet distributes as shown in Figure 2, and this figure is the plane outspread drawing of cylindrical coil, and the Ch among Fig. 2 is the abbreviation of channel (passage), represents a passage or an antenna element.Coil antenna cell distribution shown in Figure 1 is classical Birdcage (birdcage coil), has the radiofrequency signal of 2 omnidirectional distribution (becoming 90 ° of distributions) to extract point.This coil is in the past because homogeneity is high, has 41% signal to noise ratio (S/N ratio) to improve than the coil of individual antenna unit, once is widely used.But in today that phased-array coil is used widely, again because signal to noise ratio (S/N ratio) is relatively poor relatively, parallel imaging performance relative mistake etc. are former thereby backward.Now the maximum of usefulness are 8 passage phased-array coils shown in Figure 2, and it has 8 independently antenna elements, becomes 1 * 8 distribution in annular direction, and it is a phased-array coil.It has, and the coil circuit debugging is simple, signal to noise ratio (S/N ratio) is higher relatively, parallel imaging also compares flexible characteristic.But it also has 3 obvious defects: when 1, making the latter half separable structure; The first half always has the signal demand of at least 2 passages to be connected to the latter half with the RF coaxial joint; The no magnetic RF coaxial joint relative price of using in the magnetic resonance system is expensive, is used for when last the latter half connects, also damaging than being easier to; 2, among the different antennas unit, only between adjacent or inferior adjacent antenna element, the good effect of decoupling can be arranged, because between the adjacent antenna element (such as Ch2 and Ch1, or between Ch2 and the Ch3), can adopt the method that partially overlaps to decouple; And between inferior adjacent antenna element such as Ch2 and Ch8, or between Ch2 and the Ch4), can adopt electric capacity or inductance to decouple.But just be difficult to take the measure of decoupling from (between Ch2 and Ch7, Ch6 or Ch5) between the farther antenna element mutually, make that the coupling between each antenna element is relatively large, reduced the signal to noise ratio (S/N ratio) of whole winding; 3, because its 8 antenna elements are arranged all in annular direction, make its parallel imaging direction corresponding speedup factor to be arranged in annular direction like this, the selectivity of parallel imaging and effect have also obviously reduced like this.
Summary of the invention
In view of the defective that above-mentioned prior art exists, the objective of the invention is to propose the knee joint radio-frequency coil in a kind of horizontal magnetic resonance system.
The object of the invention will be achieved through following technical scheme:
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system comprises some antenna elements, and said antenna element is greater than two, and said antenna element is divided into separable the first half and the latter half, and adjacent said antenna element partially overlaps.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: comprise 8 said antenna elements, said the first half and the latter half respectively are 4 said antenna elements.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: said antenna element is 2 * 4 mode to be arranged, and axial direction is divided into 2 sections, and every section has 4 said antenna elements.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: said the first half and the latter half surround columnar coil.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: be provided with the isolator that adopts the mode of overlapping to decouple between the said antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the inferior adjacent said antenna element; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the adjacent said antenna element in diagonal angle.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: the radiofrequency signal of said the first half and the latter half all outputs to magnetic resonance system from the stube cable of the latter half.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: said antenna element is an octagon.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: the tie point between said the first half and the latter half connects through the connector of single core.
Outstanding effect of the present invention is: the knee joint radio-frequency coil in a kind of horizontal magnetic resonance of the present invention system has good the first half and the latter half connected mode; Quality of connection is more reliable; Improve the effect of decoupling, sensitivity (signal to noise ratio (S/N ratio)) and homogeneity between the coil antenna unit, and had the PAT effect of PAT selectivity and high-quality flexibly.
Following constipation closes the embodiment accompanying drawing, and specific embodiments of the invention is done further to detail, so that technical scheme of the present invention is easier to understand, grasp.
Description of drawings
Fig. 1 is the antenna unit structure figure of birdcage knee joint coil in the prior art;
Fig. 2 is the antenna element distribution plan of 1 * 8 type knee joint coil in the prior art;
Fig. 3 is the antenna element distribution plan of the embodiment of the invention;
Fig. 4 is the signal to noise ratio (S/N ratio) test pattern of 1 * 8 coil of 1 * 8 type knee joint coil in the prior art;
Fig. 5 is the signal to noise ratio (S/N ratio) test pattern of 2 * 4 coils of the embodiment of the invention;
Fig. 6 is the signal to noise ratio (S/N ratio) movement images (data are picked up from water mould axis) of 2 * 4 coils of 1 * 8 coil and the embodiment of the invention of 1 * 8 type knee joint coil in the prior art.
Embodiment
Embodiment:
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system of present embodiment; As shown in Figure 3; Comprise 8 antenna elements; Antenna element is divided into separable the first half (being made up of jointly the first half A and the first half B) and the latter half, and the first half can therefrom be removed, and the first half is covered after on patient lies again.The first half and the latter half respectively are 4 antenna elements, wherein the latter half be clipped in about part in two dotted lines, comprise antenna element ch3, ch4, ch7, ch8; The first half comprises antenna element ch1, ch2, ch5, ch6; 4 antenna element ch1 of the first half, ch2, ch5, ch6 have a limit in the latter half.Antenna element is 2 * 4 mode to be arranged, and axial direction is divided into 2 sections, and every section has 4 antenna elements.Adjacent antenna element partially overlaps.The first half and the latter half surround columnar coil.Be provided with the isolator that adopts the mode of overlapping to decouple between the antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the inferior adjacent antenna element; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the adjacent antenna element in diagonal angle.The radiofrequency signal of the first half and the latter half all outputs to magnetic resonance system from the stube cable of the latter half.8 tie points are arranged between the first half and the latter half,, need not to adopt the radio frequency (RF) coaxial connector of Fig. 2, have better connected mode and more reliable quality of connection through the connector connection of single core.Antenna element is an octagon, and the antenna element of other shapes can reach the effect of present embodiment equally.
8 antenna elements of present embodiment are carried out the analysis of uncoupling: 1, among 4 antenna elements on the same annulus; Such as between Ch1, Ch2, Ch3, the Ch4 or between the Ch5, Ch6, Ch7, Ch8; Can adopt the method uncoupling of Overlap (partially overlapping) between any two adjacent antenna elements, can adopt electric capacity or inductance to decouple between the inferior arbitrarily adjacent antenna element.2, between the antenna element on the different annular, between Ch1 and Ch5, Ch6, Ch7, Ch8, Ch1 and Ch5 are adjacent antenna units, can adopt Overlap to decouple; It is adjacent that Ch1 and Ch6 or Ch1 and Ch8 belong to the diagonal angle, can adopt electric capacity or inductance to decouple.3, right for the diagonal angle antenna element on the different annular, between Ch1 and Ch7,, can decouple because coupling is very little.Comprehensive above 3 point analysiss can be found, between any 2 of these 8 antenna elements, can both take good uncoupling measure.Experiment shows that also the design of this coil has obtained good uncoupling effect, has improved the signal to noise ratio (S/N ratio) of whole winding.In addition because the arrangement of 8 antenna elements of this coil not only can be carried out parallel imaging on annular direction; The arrangement of factor 2 is still arranged in the vertical; Also can on y direction, carry out parallel imaging, promptly coil in three directions (pin, about, front and back) but all parallel acquisition imagings, so from the selection of parallel imaging; Have more flexibly and select, experiment proves that also the design of its relative Fig. 2 of parallel imaging effect is significantly improved.Fig. 4～experimental result shown in Figure 5 has shown the signal to noise ratio (S/N ratio) comparative result of 1 * 8 coil of 1 * 8 type knee joint coil in this coil and the prior art, and these 2 internal coil diameter sizes are identical, and in the image shown in Figure 6, ordinate SNR is a ratio, dimensionless.Horizontal ordinate is the distribution of pixel, and actual picture is 256 * 256 pixels, has only taken out most representative water mould axis among Fig. 6, and this line is made up of 256 points.Can find out that from above two pictures relative 1 * 8 distribution coil of 2 * 4 distribution coils has tangible signal to noise ratio (S/N ratio) advantage, image is also more even.
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system of present embodiment has good the first half and the latter half connected mode; Quality of connection is more reliable; Improve the effect of decoupling, sensitivity (signal to noise ratio (S/N ratio)) and homogeneity between the coil antenna unit, and had the PAT effect of PAT selectivity and high-quality flexibly.
The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming all drop within protection scope of the present invention.
Claims (8)
1. the knee joint radio-frequency coil in the horizontal magnetic resonance system; Comprise some antenna elements; It is characterized in that: said antenna element is greater than two, and said antenna element is divided into separable the first half and the latter half, and adjacent said antenna element partially overlaps.
2. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 1 system, it is characterized in that: comprise 8 said antenna elements, said the first half and the latter half respectively are 4 said antenna elements.
3. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 2 system is characterized in that: said antenna element is 2 * 4 mode to be arranged, and axial direction is divided into 2 sections, and every section has 4 said antenna elements.
4. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 3 system, it is characterized in that: said the first half and the latter half surround columnar coil.
5. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 1 system is characterized in that: be provided with the isolator that adopts the mode of overlapping to decouple between the said antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the inferior adjacent said antenna element; Be provided with the isolator that adopts capacitive way or inductance mode to decouple between the adjacent said antenna element in diagonal angle.
6. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 1 system, it is characterized in that: the radiofrequency signal of said the first half and the latter half all outputs to magnetic resonance system from the stube cable of the latter half.
7. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 1 system, it is characterized in that: said antenna element is an octagon.
8. the knee joint radio-frequency coil in a kind of horizontal magnetic resonance according to claim 1 system, it is characterized in that: the tie point between said the first half and the latter half connects through the connector of single core.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105286864A (en) * | 2014-06-30 | 2016-02-03 | 中国科学院上海生命科学研究院 | Integrated coil, special for non-human primates, in magnetic resonance imaging system |
| CN106291420A (en) * | 2016-09-26 | 2017-01-04 | 苏州众志医疗科技有限公司 | Wrist coil for magnetic resonance imaging system |
| CN107242898A (en) * | 2017-06-29 | 2017-10-13 | 安徽硕金医疗设备有限公司 | A kind of knee joint intervenes coil |
| CN109460688A (en) * | 2018-09-27 | 2019-03-12 | 威海北洋光电信息技术股份公司 | Three-dimensional settlement channel device and its application method based on isosceles triangle antenna |
| CN109655772A (en) * | 2019-01-14 | 2019-04-19 | 浙江大学 | Toy radio-frequency coil for clinical super high field magnetic resonance imaging system |
| CN112394308A (en) * | 2019-08-15 | 2021-02-23 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
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| 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 |
| DE102010024432A1 (en) * | 2010-06-21 | 2011-12-22 | Siemens Aktiengesellschaft | Local coil for use in magnetic resonance device for patient, has conductor loops arranged opposite to each other along offset directions, where part of conductor loops is designed for balancing offset such that rows of loops end on lines |
| CN102305917A (en) * | 2011-08-01 | 2012-01-04 | 苏州众志医疗科技有限公司 | Horizontal field head coil used for magnetic resonance imaging system |
| CN102508181A (en) * | 2011-11-29 | 2012-06-20 | 苏州众志医疗科技有限公司 | Small-animal-shaped coil in magnetic resonance system |
| CN202661618U (en) * | 2012-07-04 | 2013-01-09 | 苏州众志医疗科技有限公司 | Knee joint radio frequency coil in horizontal field magnetic resonance system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102010024432A1 (en) * | 2010-06-21 | 2011-12-22 | Siemens Aktiengesellschaft | Local coil for use in magnetic resonance device for patient, has conductor loops arranged opposite to each other along offset directions, where part of conductor loops is designed for balancing offset such that rows of loops end on lines |
| 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 |
| CN102305917A (en) * | 2011-08-01 | 2012-01-04 | 苏州众志医疗科技有限公司 | Horizontal field head coil used for magnetic resonance imaging system |
| CN102508181A (en) * | 2011-11-29 | 2012-06-20 | 苏州众志医疗科技有限公司 | Small-animal-shaped coil in magnetic resonance system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105286864A (en) * | 2014-06-30 | 2016-02-03 | 中国科学院上海生命科学研究院 | Integrated coil, special for non-human primates, in magnetic resonance imaging system |
| CN106291420A (en) * | 2016-09-26 | 2017-01-04 | 苏州众志医疗科技有限公司 | Wrist coil for magnetic resonance imaging system |
| CN107242898A (en) * | 2017-06-29 | 2017-10-13 | 安徽硕金医疗设备有限公司 | A kind of knee joint intervenes coil |
| CN109460688A (en) * | 2018-09-27 | 2019-03-12 | 威海北洋光电信息技术股份公司 | Three-dimensional settlement channel device and its application method based on isosceles triangle antenna |
| CN109460688B (en) * | 2018-09-27 | 2021-11-09 | 威海北洋光电信息技术股份公司 | Three-dimensional settlement channel device based on delta-shaped antenna and using method thereof |
| CN109655772A (en) * | 2019-01-14 | 2019-04-19 | 浙江大学 | Toy radio-frequency coil for clinical super high field magnetic resonance imaging system |
| CN109655772B (en) * | 2019-01-14 | 2020-01-17 | 浙江大学 | Small animal radio frequency coil for clinical ultrahigh field magnetic resonance imaging system |
| CN112394308A (en) * | 2019-08-15 | 2021-02-23 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
| CN112394308B (en) * | 2019-08-15 | 2024-01-30 | 西门子(深圳)磁共振有限公司 | Transmitting radio frequency coil unit and magnetic resonance system |
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Application publication date: 20121024 |