CN202661618U - Knee joint radio frequency coil in horizontal field magnetic resonance system - Google Patents
Knee joint radio frequency coil in horizontal field magnetic resonance system Download PDFInfo
- Publication number
- CN202661618U CN202661618U CN 201220319880 CN201220319880U CN202661618U CN 202661618 U CN202661618 U CN 202661618U CN 201220319880 CN201220319880 CN 201220319880 CN 201220319880 U CN201220319880 U CN 201220319880U CN 202661618 U CN202661618 U CN 202661618U
- Authority
- CN
- China
- Prior art keywords
- magnetic resonance
- knee joint
- frequency coil
- coil
- antenna element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model discloses a knee joint radio frequency coil in a horizontal field magnetic resonance system. The knee joint radio frequency coil comprises a plurality of antenna units, wherein the number of the antenna units is greater than two; the antenna units are divided into separable upper half parts and lower half parts; and adjacent antenna units are partially overlapped. The knee joint radio frequency coil in the horizontal field magnetic resonance system has the advantages of good upper half part and lower half part connection mode, more reliable connection quality, capability of improving the decoupling effect, the sensitivity (signal-noise ratio) and the uniformity between the antenna units of the coil, flexible PAT (Parallel Acquisition Technique) selectivity and superior PAT effect.
Description
Technical field
The utility model belongs to the magnetic resonance imaging field, is 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 perpendicualr field system refers to the magnetic direction of magnet with people's trunk perpendicular 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, because the antenna element in the coil needs to follow as much as possible the magnet perpendicular direction, 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 Effective Raise picture quality.Such as reducing image artifacts, accelerate image imaging speed, be extremely important, an effective technology in the magnetic resonance imaging.But the imaging effect of PAT (or ability) is except following the magnetic resonance parameters in series (such as FOV, over-sampling etc.) beyond setting, the selection of aspect, phase-encoding direction (phase encoding direction) are relevant, also with the design of coil, quantity and the positional alignment of coil antenna unit very large relation is arranged, so the coil antenna cell distribution arrangement design of knee joint coil is a key of its PAT imaging effect.
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 channel(passage) abbreviation, represent a passage or an antenna element.Coil antenna cell distribution shown in Figure 1 is classical Birdcage(birdcage coil), there is 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 relatively poor, 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 that coil circuit debugging is simple, signal to noise ratio (S/N ratio) is relatively high, also characteristics more flexibly of parallel imaging.But it also has 3 obvious defectives: 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 radio-frequency (RF) coaxial joint, that uses in the magnetic resonance system is expensive without magnetic radio-frequency (RF) coaxial joint relative price, is used for also damaging than being easier to when upper the latter half connects; 2, among the different antenna elements, only between adjacent or inferior adjacent antenna element, good decoupling effect 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 come decoupling; And between inferior adjacent antenna element such as Ch2 and Ch8, or between Ch2 and the Ch4), can adopt electric capacity or inductance decoupling.But just be difficult to take the decoupling measure from (between Ch2 and Ch7, Ch6 or Ch5) between the farther antenna element, so that the coupling between each antenna element is relatively large, reduced the signal to noise ratio (S/N ratio) of whole coil; 3, because its 8 antenna elements are arranged all in annular direction, so that its parallel imaging direction can only have corresponding speedup factor in annular direction, the selectivity of parallel imaging and effect have also obviously reduced so like this.
The utility model content
In view of the defective that above-mentioned prior art exists, the purpose of this utility model is the knee joint radio-frequency coil in a kind of horizontal magnetic resonance of proposition system.
The purpose of this utility model will be achieved by the following technical programs:
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system comprises some antenna elements, and described antenna element is greater than two, and described antenna element is divided into separable the first half and the latter half, and adjacent described 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 described antenna elements, described the first half and the latter half respectively are 4 described antenna elements.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: described antenna element is 2 * 4 mode to be arranged, and axial direction is divided into 2 sections, and every section has 4 described antenna elements.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: described 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 decoupling that overlaps between the described antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode between the inferior adjacent described antenna element; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode between the adjacent described 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 described 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: described antenna element is octagon.
Preferably, the knee joint radio-frequency coil in the above-mentioned a kind of horizontal magnetic resonance system, wherein: the tie point between described the first half and the latter half connects by the connector of single core.
Outstanding effect of the present utility model is: the knee joint radio-frequency coil in a kind of horizontal magnetic resonance of the present utility model system has good the first half and the latter half connected mode, quality of connection is more reliable, improve decoupling effect, sensitivity (signal to noise ratio (S/N ratio)) and homogeneity between the coil antenna unit, and had the flexibly PAT effect of PAT selectivity and high-quality.
Following constipation closes the embodiment accompanying drawing, embodiment of the present utility model is described in further detail, so that technical solutions of the utility model are 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 utility model embodiment;
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 utility model embodiment;
Fig. 6 is the signal to noise ratio (S/N ratio) movement images (data acquisition is from water mould axis) of 2 * 4 coils of 1 * 8 coil of 1 * 8 type knee joint coil in the prior art and the utility model embodiment.
Embodiment
Embodiment:
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system of the present embodiment, as shown in Figure 3, comprise 8 antenna elements, antenna element is divided into separable the first half (jointly being made of the first half A and the first half B) and the latter half, 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; The first half 4 antenna element ch1, 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 decoupling that overlaps between the antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode between the inferior adjacent antenna element; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode 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, by the connector connection of single core, need not to adopt the radio frequency (RF) coaxial connector of Fig. 2, have better connected mode and more reliable quality of connection.Antenna element is octagon, and the antenna element of other shapes can reach the effect of the present embodiment equally.
8 antenna elements of the 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 Ch5, Ch6, Ch7, the Ch8, can adopt Overlap(to partially overlap between any two adjacent antenna elements) the method uncoupling, arbitrarily can adopt electric capacity or inductance decoupling between time 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 the Overlap decoupling; It is adjacent that Ch1 and Ch6 or Ch1 and Ch8 belong to the diagonal angle, can adopt electric capacity or inductance decoupling.3, for the diagonal angle antenna element on the different annular pair, between Ch1 and Ch7, because coupling is very little, can be without decoupling.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 coil.In addition because the arrangement of 8 antenna elements of this coil not only can be carried out parallel imaging in annular direction, the arrangement of the factor 2 is still arranged in the vertical, also can carry out parallel imaging at y direction, be 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 comprised of 256 points.Can find out from above two pictures, relative 1 * 8 distribution coil of 2 * 4 distribution coils has obvious signal to noise ratio (S/N ratio) advantage, and image is also more even.
Knee joint radio-frequency coil in a kind of horizontal magnetic resonance system of the present embodiment has good the first half and the latter half connected mode, quality of connection is more reliable, improve decoupling effect, sensitivity (signal to noise ratio (S/N ratio)) and homogeneity between the coil antenna unit, and had the flexibly PAT effect of PAT selectivity and high-quality.
The utility model still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming all drop within the protection domain of the present utility model.
Claims (8)
1. the knee joint radio-frequency coil in the horizontal magnetic resonance system, comprise some antenna elements, it is characterized in that: described antenna element is greater than two, and described antenna element is divided into separable the first half and the latter half, and adjacent described 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 described antenna elements, described the first half and the latter half respectively are 4 described 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: described antenna element is 2 * 4 mode to be arranged, and axial direction is divided into 2 sections, and every section has 4 described 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: described 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 decoupling that overlaps between the described antenna element of direct neighbor; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode between the inferior adjacent described antenna element; Be provided with the isolator that adopts capacitive way or the decoupling of inductance mode between the adjacent described 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 described 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: described antenna element is 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 described the first half and the latter half connects by the connector of single core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220319880 CN202661618U (en) | 2012-07-04 | 2012-07-04 | Knee joint radio frequency coil in horizontal field magnetic resonance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220319880 CN202661618U (en) | 2012-07-04 | 2012-07-04 | Knee joint radio frequency coil in horizontal field magnetic resonance system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202661618U true CN202661618U (en) | 2013-01-09 |
Family
ID=47456516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220319880 Expired - Fee Related CN202661618U (en) | 2012-07-04 | 2012-07-04 | Knee joint radio frequency coil in horizontal field magnetic resonance system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202661618U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749597A (en) * | 2012-07-04 | 2012-10-24 | 苏州众志医疗科技有限公司 | Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system |
| CN103645452A (en) * | 2013-12-09 | 2014-03-19 | 深圳市特深电气有限公司 | Multi-channel radio frequency coil device and magnetic resonance imaging system using the device |
| CN111273206A (en) * | 2020-03-27 | 2020-06-12 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method |
-
2012
- 2012-07-04 CN CN 201220319880 patent/CN202661618U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749597A (en) * | 2012-07-04 | 2012-10-24 | 苏州众志医疗科技有限公司 | Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system |
| CN103645452A (en) * | 2013-12-09 | 2014-03-19 | 深圳市特深电气有限公司 | Multi-channel radio frequency coil device and magnetic resonance imaging system using the device |
| CN111273206A (en) * | 2020-03-27 | 2020-06-12 | 苏州众志医疗科技有限公司 | Magnetic resonance radio frequency array coil and device and magnetic resonance imaging method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102749597A (en) | Knee joint radio-frequency (RF) coil in horizontal-field magnetic resonance system | |
| CN105188527B (en) | Coil system for magnetic resonance imaging | |
| CN102914751B (en) | Local coil with multiple shim coils capable of being individually turned off | |
| US6998843B2 (en) | RF coil and magnetic resonance imaging apparatus | |
| CN102830377B (en) | local coil for imaging system | |
| Clément et al. | A human cerebral and cerebellar 8‐channel transceive RF dipole coil array at 7T | |
| CN102375132A (en) | Mechanically flexible magnet resonance coil capable of cutting off conductor structure | |
| CN104698411B (en) | For the Multi-channel radio-frequency coil of open type magnetic resonance imaging (MRI) system | |
| CN202661618U (en) | Knee joint radio frequency coil in horizontal field magnetic resonance system | |
| US20080129294A1 (en) | Orthogonal Coil for Magnetic Resonance Imaging | |
| CN104011556B (en) | Transverse-electromagnetic for magnetic resonance（TEM）Radio-frequency coil | |
| CN103645452A (en) | Multi-channel radio frequency coil device and magnetic resonance imaging system using the device | |
| US20110279119A1 (en) | Combinable multipart surface coil for magnetic resonance tomography | |
| CN203773037U (en) | Mammary-gland magnetic-resonance radiofrequency receiving coil of magnetic-resonance imaging system | |
| US20140300360A1 (en) | Multi-channel Coil Array for Parallel Magnetic Resonance Imaging | |
| Lagore et al. | An 8‐dipole transceive and 24‐loop receive array for non‐human primate head imaging at 10.5 T | |
| CN205193258U (en) | A RF coil array for magnetic resonance system | |
| CN204649945U (en) | Mammary gland magnetic resonance RF receiving coil circuit structure | |
| CN202975301U (en) | Breast coil assembly for magnetic resonance | |
| US7602188B2 (en) | System of electric coils for transmitting and receiving radio-frequency magnetic fields in a magnetic-resonance imaging apparatus, and magnetic-resonance imaging apparatus provided with such a system of electric coils | |
| CN104280702B (en) | Local coil for the MRT systems of imaging | |
| CN102809735B (en) | The shoulder coil selected with upper-part and/or depending on the element of supporting is designed | |
| CN102018512A (en) | Pelvic-part RF (radio-frequency) coil for magnetic res.onance imaging | |
| CN202330682U (en) | Miniature animal coil in magnetic resonance system | |
| CN202196164U (en) | Infant whole-body radio-frequency coil device for magnetic resonance imaging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20210704 |