CN202978839U - Gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils - Google Patents
Gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils Download PDFInfo
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- CN202978839U CN202978839U CN 201220691047 CN201220691047U CN202978839U CN 202978839 U CN202978839 U CN 202978839U CN 201220691047 CN201220691047 CN 201220691047 CN 201220691047 U CN201220691047 U CN 201220691047U CN 202978839 U CN202978839 U CN 202978839U
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Abstract
The utility model discloses a gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils. The gain camel peak suppression circuit comprises a signal channel (1) and a grounded channel (2) which are respectively connected with a first camel peak suppression resonance circuit (3) and a second camel peak suppression resonance circuit (4). Resonance frequency of the first camel peak suppression resonance circuit (3) is identical with prepeak frequency of an output signal gain curve of a magnetic-resonance radio-frequency receiving coil, and resonance frequency of the second camel peak suppression resonance circuit (4) is identical with postpeak frequency of the output signal gain curve of the magnetic-resonance radio-frequency receiving coil. The gain camel peak suppression circuit has the advantages of low possibility in circuit oscillation, high imaging stability, simple structure and low cost.
Description
Technical field
The utility model relates to the magnetic resonance imaging field, is specifically related to a kind of gain camel peak for the magnetic resonance radio frequency receiving coil and suppresses circuit.
Background technology
Magnetic resonance imaging (MRI) is a very important part in the modern medicine iconography, has Noninvasive, without characteristics such as ionising radiations.RF receiving coil is a vitals of magnetic resonance system, and its performance is directly determining the image quality of magnetic resonance system, is called as " eyes " of magnetic resonance system.
In order to obtain better picture quality, in recent years, the port number of RF receiving coil is more and more.In this case, eliminate the coupling between each passage, just become more and more important.In view of this consideration, people have introduced low input impedance preamplifier increases coupling between each coil channel.
In order to obtain best effect, people adopt the way that preamplifier is placed on coil inside more and more, and have abandoned gradually the mode that preamplifier is placed on the magnetic resonance system the inside of early stage employing.
As shown in Figure 1, the magnetic resonance radio frequency receiving coil of prior art comprises interconnective RF receiving coil 5 and preamplifier 50, RF receiving coil 5 is connected with preamplifier 50 by connection line 501, preamplifier 50 is respectively equipped with output port 51 and grounding ports 52, and the magnetic resonance radio frequency receiving coil is exported signal by output port 51 and grounding ports 52.The gain curve that the output of the RF receiving coil of the built-in preamplifier that consists of take the preamplifier 50 of the RF receiving coil 5 of a 10cm x 10cm size and low input impedance obtains on network analyzer is as example, wherein the input impedance of preamplifier 50 is that 2 ohm, output impedance are that 50 ohm, centre frequency are 127.7MHz, the gain G=30dB of preamplifier 50 itself.As shown in Figure 2, in aforementioned magnetic resonance radio frequency receiving coil output gain signal curve, 14 places are signal frequency, and 15 places are the leading peak of gain curve, and 16 places are the postpeak of gain curve, and 14,15,16 3 places form the white horse with a black mane hump shape, consist of gain camel peak.Wherein, the frequency at 14 places is signal frequency f0, and the signal of magnetic resonance system acquisition and processing imaging is from this frequency place, and the frequency at 14 places and gain intensity level are respectively f0=127.7MHz, I=-2dB; The frequency at 15 places is that frequency and the gain intensity level at leading peak frequency f 1,15 place is respectively f1=120.7MHz, I1=9.9dB; The frequency of 16 is that frequency and the gain intensity level at postpeak frequency f 1,16 place is respectively f0=135.7MHz, I2=12dB.
But, leading peak in gain curve (15) and postpeak (16) they are not have contributively for magnetic resonance signal, and their appearance is the use due to low input impedance amplifier---be exactly the preamplifier that front each interchannel isolation of said increase radio-frequency coil is introduced.In general, the input impedance of amplifier is lower, and the effect that increases radio-frequency coil interchannel isolation is better, but the spacing at two peaks can be larger, and the intensity difference of the peak strength at two peaks and two peak-to-peak the lowest point 14 place's signals also will be larger.For amplifying circuit, gain higher, more easily form vibration.In gain curve shown in Figure 2, the intensity level at signal 14 places is-2dB, and the intensity of 16 place's unwanted signals has reached 12dB, and after the useless high 14dB(of signal intensity ratio useful signal intensity was converted into linear relationship, 16 place's intensity were more than 5 times of 14 place's intensity).In increasing the better design of isolation effect, this strength difference is also larger.In sum, in the situation that maintain with signal strength signal intensity necessarily, the input impedance of the preamplifier of use is lower, the effect that increases isolation between each passage is better, but the intensity at gain place, camel peak is relatively higher, also just more easily causes vibration to cause Iimaging Stability low.
The utility model content
The gain camel peak inhibition circuit that is used for the magnetic resonance radio frequency receiving coil that the possibility that the technical problems to be solved in the utility model is to provide a kind of circuit oscillation is low, Iimaging Stability is high, simple in structure, with low cost.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
a kind of gain camel peak inhibition circuit for the magnetic resonance radio frequency receiving coil, comprise signal path and grounded circuit, one end of described signal path is provided with the signal input part that is connected for the output port with magnetic resonance radio frequency receiving coil preamplifier, the other end of described signal path is provided with signal output part, one end of described grounded circuit is provided with the ground connection input that is connected for the grounding ports with the magnetic resonance radio frequency receiving coil, the other end of described grounded circuit is provided with the ground connection output, be connected with respectively the first camel peak inhibition resonant circuit and the second camel peak inhibition resonant circuit between described signal path and grounded circuit, the resonance frequency of described the first camel peak inhibition resonant circuit is identical with the leading peak frequency of described magnetic resonance radio frequency receiving coil output gain signal curve, the resonance frequency of described the second camel peak inhibition resonant circuit is identical with the postpeak frequency of described magnetic resonance radio frequency receiving coil output gain signal curve.
As further improvement in the technical proposal:
Described the first camel peak inhibition resonant circuit and the second camel peak inhibition resonant circuit form by the electric capacity that is connected in series and inductance.
The utlity model has following advantage:
1, be connected with respectively the first camel peak inhibition resonant circuit and the second camel peak inhibition resonant circuit between signal path of the present utility model and grounded circuit, the resonance frequency of the first camel peak inhibition resonant circuit is identical with the leading peak frequency of magnetic resonance radio frequency receiving coil output gain signal curve, the resonance frequency of the second camel peak inhibition resonant circuit is identical with the postpeak frequency of magnetic resonance radio frequency receiving coil output gain signal curve, therefore the leading peak of magnetic resonance radio frequency receiving coil output gain signal curve and postpeak can be reduced to approximate 0 ohm by original 50 ohm, therefore make the built-in preamplifier of magnetic resonance radio frequency receiving coil will greatly reduce because of impedance mismatching in the gain intensity at leading peak frequency and postpeak frequency place, thereby reduce the possibility of magnetic resonance radio frequency receiving coil circuit oscillation, the utility model is for the signal frequency place of system acquisition simultaneously, transfer impedance changes hardly, so the gain intensity for signal is influenced hardly, possibility with circuit oscillation is low, Iimaging Stability is high, simple in structure, advantage with low cost.
2, utility model is as the camel peak inhibition circuit that independently gains, can be arranged on the front end of preamplifier in the magnetic resonance radio frequency receiving coil, perhaps be arranged on the rear end of preamplifier in the magnetic resonance radio frequency receiving coil, perhaps be arranged in the partial circuit of preamplifier in the magnetic resonance radio frequency receiving coil, can both realize the leading peak of magnetic resonance radio frequency receiving coil output gain signal curve and the inhibition of postpeak, have advantages of that application mode is flexible, have wide range of applications, can offer convenience for the design of magnetic resonance radio frequency receiving coil.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the frame structure schematic diagram of the magnetic resonance radio frequency receiving coil of prior art.
Fig. 2 is the gain curve schematic diagram of the magnetic resonance radio frequency receiving coil output signal of prior art, and wherein 14 places are signal frequency detection place; 15 places are leading peak; 16 places are postpeak.
Fig. 3 is the circuit theory schematic diagram of the utility model embodiment.
Fig. 4 is the output gain signal curve comparison schematic diagram of the utility model embodiment and prior art, and wherein 18 is the gain curve of the present embodiment, and 17 is the gain curve of prior art.
The legend label declaration:
1, signal path; 11, signal input part; 12, signal output part;
2, grounded circuit; 21, ground connection input; 22, ground connection output;
3, the first camel peak inhibition resonant circuit;
4, the second camel peak inhibition resonant circuit;
5, RF receiving coil; 50, preamplifier; 501, connection line; 51, output port; 52, grounding ports.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention are made more explicit defining.
as shown in Figure 3, the gain camel peak inhibition circuit that is used for the magnetic resonance radio frequency receiving coil of the present embodiment comprises signal path 1 and grounded circuit 2, one end of signal path 1 is provided with the signal input part 11 that is connected for the output port 51 with magnetic resonance radio frequency receiving coil preamplifier 50, the other end of signal path 1 is provided with signal output part 12, one end of grounded circuit 2 is provided with the ground connection input 21 that is connected for the grounding ports 52 of magnetic resonance radio frequency receiving coil, the other end of grounded circuit 2 is provided with ground connection output 22, be connected with respectively the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4 between signal path 1 and grounded circuit 2, the resonance frequency of the first camel peak inhibition resonant circuit 3 is identical with the leading peak frequency of magnetic resonance radio frequency receiving coil output gain signal curve, the resonance frequency of the second camel peak inhibition resonant circuit 4 is identical with the postpeak frequency of magnetic resonance radio frequency receiving coil output gain signal curve, first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4 of the present embodiment by increasing.
In the present embodiment, the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4 form by the electric capacity that is connected in series and inductance; In the present embodiment, the inductance of the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4 is 0.33uH, and the inductance of the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4 is the tunable capacitor of 2 ~ 8pF.Suitably adjust the value of electric capacity and inductance, can make the resonance frequency of the first camel peak inhibition resonant circuit 3 identical with the leading peak frequency of magnetic resonance radio frequency receiving coil output gain signal curve, the resonance frequency of the second camel peak inhibition resonant circuit 4 is identical with the postpeak frequency of magnetic resonance radio frequency receiving coil output gain signal curve.
Under ideal state (inductance and electric capacity do not have loss), frequency f 1 and the f2 transfer impedance at this place is 0, and signal will all be reflected back, energy consumption in the build-out resistor of amplifier, the strength decreased to 0 at this place.When the first camel peak suppressed the electric capacity of resonant circuit 3 and inductance resonance at the f1 place, for signal f0, electric capacity and inductance were equivalent to an inductance ZL; When the second camel peak suppressed the electric capacity of resonant circuit 4 and inductance resonance at the f2 place, for signal f0, electric capacity and inductance were equivalent to an electric capacity ZC.In the middle of reality, general f0-f1 ≈ f2-f0, so, ZL ≈ ZC, namely the approximate resonance of ZL and ZC is at f0, so, for signal f0, due to the introducing of the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4, change hardly the resistance of whole circuit, that is to say the power delivery at signal f0 place, influenced hardly.In the middle of reality, any device can not be all absolute perfect condition, all introduces more or less loss.Even so, the first camel peak suppresses the introducing that resonant circuit 3 and the second camel peak suppress resonant circuit 4, the also gain intensity at f1 and f2 place greatly, and then reduction causes the possibility of vibration.
as shown in Figure 4, by contrast the present embodiment increased gain curve 17 relative prior art after inhibition circuit (the first camel peak suppresses resonant circuit 3 and the second camel peak suppresses resonant circuit 4) do not increase suppress circuit (first camel peak suppress resonant circuit 3 and the second camel peak inhibition resonant circuit 4) gain curve 18 as can be known, leading peak and the postpeak at the gain camel peak of the present embodiment output gain signal curve have all obtained effective inhibition, therefore the intensity of leading peak and postpeak in the camel peak of gaining can be eliminated/suppress to the present embodiment in radio-frequency coil, and change hardly the intensity of signal frequency collection place signal, thereby reduce the probability that produces vibration.In sum, the present embodiment is by the introducing of the first camel peak inhibition resonant circuit 3 and the second camel peak inhibition resonant circuit 4, in the situation that guarantee that signal strength signal intensity is constant, greatly reduced the gain intensity at non-signal frequency place, especially the leading peak at camel peak and the gain intensity at postpeak place gain, this change can greatly reduce the possibility of circuit oscillation, thereby for the design of magnetic resonance radio frequency receiving coil offers convenience, can improve the Iimaging Stability of magnetic resonance radio frequency receiving coil.
The above is only preferred implementation of the present utility model, and protection range of the present utility model is not limited in above-mentioned execution mode, and every technical scheme that belongs to the utility model principle all belongs to protection range of the present utility model.For a person skilled in the art, some improvements and modifications of carrying out under the prerequisite that does not break away from principle of the present utility model, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (2)
1. a gain camel peak that is used for the magnetic resonance radio frequency receiving coil suppresses circuit, it is characterized in that: comprise signal path (1) and grounded circuit (2), one end of described signal path (1) is provided with the signal input part (11) that is connected for the output port (51) of magnetic resonance radio frequency receiving coil preamplifier (50), the other end of described signal path (1) is provided with signal output part (12), one end of described grounded circuit (2) is provided with the ground connection input (21) that is connected for the grounding ports (52) of magnetic resonance radio frequency receiving coil, the other end of described grounded circuit (2) is provided with ground connection output (22), be connected with respectively the first camel peak inhibition resonant circuit (3) and the second camel peak inhibition resonant circuit (4) between described signal path (1) and grounded circuit (2), the resonance frequency of described the first camel peak inhibition resonant circuit (3) is identical with the leading peak frequency of described magnetic resonance radio frequency receiving coil output gain signal curve, the resonance frequency of described the second camel peak inhibition resonant circuit (4) is identical with the postpeak frequency of described magnetic resonance radio frequency receiving coil output gain signal curve.
2. the gain camel peak for the magnetic resonance radio frequency receiving coil according to claim 1 suppresses circuit, it is characterized in that: described the first camel peak suppresses resonant circuit (3) and the second camel peak suppresses resonant circuit (4) by the electric capacity that is connected in series and inductance composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220691047 CN202978839U (en) | 2012-12-13 | 2012-12-13 | Gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220691047 CN202978839U (en) | 2012-12-13 | 2012-12-13 | Gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils |
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| Publication Number | Publication Date |
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| CN202978839U true CN202978839U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220691047 Expired - Lifetime CN202978839U (en) | 2012-12-13 | 2012-12-13 | Gain camel peak suppression circuit for magnetic-resonance radio-frequency receiving coils |
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| CN (1) | CN202978839U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3151026B1 (en) * | 2014-05-27 | 2020-10-28 | Shanghai Chenguang Medical Technologies Co., Ltd. | Pre-amplifier for magnetic resonance imaging radio-frequency coil |
| CN116744844A (en) * | 2021-03-24 | 2023-09-12 | 科隆有限责任公司 | RF receive coil circuit for MRI system |
-
2012
- 2012-12-13 CN CN 201220691047 patent/CN202978839U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3151026B1 (en) * | 2014-05-27 | 2020-10-28 | Shanghai Chenguang Medical Technologies Co., Ltd. | Pre-amplifier for magnetic resonance imaging radio-frequency coil |
| CN116744844A (en) * | 2021-03-24 | 2023-09-12 | 科隆有限责任公司 | RF receive coil circuit for MRI system |
| EP4277522A4 (en) * | 2021-03-24 | 2024-05-22 | Coilone, LLC | Rf receive coil circuit for mri systems |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Qingpu District of Shanghai city in 201707 Huaqing Road No. 1269 Patentee after: SHANGHAI CHENGUANG MEDICAL TECHNOLOGIES Co.,Ltd. Address before: 201107 building 1199, Lane 8, Ji Zhai Road, Shanghai, Minhang District Patentee before: SHANGHAI CHENGUANG MEDICAL TECHNOLOGIES Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130605 |
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| CX01 | Expiry of patent term |