CN103376428B - Signal transmitting apparatus and magnetic resonance imaging system - Google Patents
Signal transmitting apparatus and magnetic resonance imaging system Download PDFInfo
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- CN103376428B CN103376428B CN201210126816.XA CN201210126816A CN103376428B CN 103376428 B CN103376428 B CN 103376428B CN 201210126816 A CN201210126816 A CN 201210126816A CN 103376428 B CN103376428 B CN 103376428B
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Abstract
A kind of signal transmitting apparatus, magnetic resonance imaging system.Described signal transmitting apparatus comprises: signal combiner unit, multiple frequency mixer, multiple band filter and multiple demodulator of PM signal PM; The mixed frequency signal of input signal and local oscillation signal exports by multiple frequency mixer; Signal combiner unit comprises multiple band elimination filter, and the input of multiple band elimination filter is connected respectively the outfan of multiple frequency mixer, for receiving mixed frequency signal; The outfan of multiple band elimination filter is connected to together jointly, for transmitting multiple mixed frequency signal simultaneously; The input of multiple band filter links together jointly, for receiving multiple mixed frequency signals of described signal combiner unit transmission; The outfan of multiple band filter is used for the mixed frequency signal fallen in its corresponding band connection frequency to export; Multiple demodulator of PM signal PM is connected respectively the outfan of multiple band filter, carries out demodulation for the signal exported band filter.The structure of signal transmitting apparatus of the present invention is simple.
Description
Technical field
The present invention relates to mr imaging technique field, particularly a kind of signal transmitting apparatus and magnetic resonance imaging system.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) technology is widely used in medical domain.In magnetic resonance imaging system, need the data signal transmitting multichannel, finally to form medical image.
Usually adopt switch matrix to form the passage of Signal transmissions in the conventional technology, each switch has two control ends, controls the state of each switch thus carry out the selection of passage by control circuit.Namely Fig. 1 shows in prior art the schematic diagram utilizing switch matrix to form signal transmission passage.
With reference to figure 1, switch matrix 2 is made up of multiple switching device 20 and multiple control circuit 26.Particularly, described control circuit 26 connects by control signal wire 22 and 24 is corresponding with between switching device 20.Described switch matrix 2 has signal input part 8 and signal output part 12, and described signal input part 8 is connected with local oscillator coil (1ocal coil) 4 by preamplifier 10, and described signal output part 12 is connected with A/D converter 6 by frequency mixer 14; Described signal input part 8 carries out Signal transmissions with signal output part 12 by multiple signal transmssion line 16 and 18.
More can with reference to the relevant record in US Patent No. 7684427B2 about utilizing switch matrix to form the content of signal transmission passage.
But adopt switch matrix to form signal transmission passage and need a large amount of switching devices, a large amount of FPGA (Field-Programmable Gate Array is also needed in order to control these switching devices, field programmable gate array) produce control signal, existence due to these radio circuits also needs to mate each road path, so just make the structure of this mode very complicated, practicality is poor.
Therefore, the structure how simplifying signal transmission passage just becomes one of those skilled in the art's problem demanding prompt solution.
Summary of the invention
The problem that the present invention solves is to provide a kind of signal transmitting apparatus and magnetic resonance imaging system, effectively to simplify the structure of its signal transmission passage.
For solving the problem, the invention provides a kind of signal transmitting apparatus, comprising: signal combiner unit, multiple frequency mixer, multiple band filter and multiple demodulator of PM signal PM;
Described multiple frequency mixer comprises first input end, the second input and outfan respectively, described first input end is for receiving input signal, second input is for receiving local oscillation signal, and outfan is used for the mixed frequency signal of input signal and local oscillation signal to export; The mid frequency of described local oscillation signal is all not identical;
Described signal combiner unit comprises multiple band elimination filter, and the input of described multiple band elimination filter is connected respectively the outfan of multiple frequency mixer, for receiving mixed frequency signal; The outfan of described multiple band elimination filter is connected to together jointly, for transmitting multiple mixed frequency signal simultaneously;
The input of described multiple band filter links together jointly, for receiving multiple mixed frequency signals of described signal combiner unit transmission; The outfan of described multiple band filter is used for the mixed frequency signal fallen in its corresponding band connection frequency to export, and the band connection frequency of each band filter is all not identical;
Described multiple demodulator of PM signal PM is connected respectively the outfan of multiple band filter, carries out demodulation for the signal exported described band filter.
Alternatively, Signal transmissions is carried out by a cable between described signal combiner unit and multiple band filter.
Alternatively, Signal transmissions is carried out by a pair antenna between described signal combiner unit and multiple band filter.
Alternatively, the bandwidth of described multiple band filter is identical.
Alternatively, described signal transmitting apparatus also comprises multiple local oscillation signal generation unit, described multiple local oscillation signal generation unit is connected respectively multiple frequency mixer, for exporting local oscillation signal, and the frequency of the local oscillation signal exported is regulated according to conditioning signal, switch to object tape bandpass filter to make described mixed frequency signal and export; Described conditioning signal associates with the band connection frequency of described object tape bandpass filter.
For solving the problem, the present invention also provides a kind of magnetic resonance imaging system, described system comprises: acquisition of magnetic resonance signals device, above-mentioned signal transmitting apparatus and multiple signal processing apparatus, described acquisition of magnetic resonance signals device, for gathering imaging features signal; Described signal transmitting apparatus connects described acquisition of magnetic resonance signals device, transmits for the imaging features signal collected acquisition of magnetic resonance signals device; Described signal processing apparatus connects described signal transmitting apparatus, for processing the imaging features signal received.
Alternatively, described acquisition of magnetic resonance signals device comprises magnet, gradient coil, radio-frequency sending coil and RF receiving coil, and wherein, the quantity of described RF receiving coil is greater than the quantity of described signal processing apparatus.
Compared with prior art, the present invention at least has the following advantages:
1) multichannel input signal is carried out mixing by signal transmitting apparatus of the present invention, then by signal combiner unit by the Signal transmissions after multichannel mixing to band filter, the signal fallen in its band connection frequency exports by described band filter, realize the transmission of signal by means of only a signal paths between described signal combiner unit and band filter, structure when transmitting than adopting switch matrix in prior art is simple, reduces its complexity.
2) the signal combiner unit of signal transmitting apparatus of the present invention comprises multiple band elimination filter, described multiple band elimination filter can receive corresponding respectively for multichannel mixed frequency signal and transmit, thus serve the effect being carried out by multichannel mixed frequency signal isolating, avoid the mutual interference between multichannel mixed frequency signal.
3) in possibility, signal transmitting apparatus of the present invention also comprises multiple local oscillation signal generation unit, described local oscillation signal generation unit can carry out the mid frequency of corresponding adjustment local oscillation signal according to the band connection frequency of band filter, and then change the frequency of mixed frequency signal, when the frequency of mixed frequency signal falls in the passband frequency range of other band filters, downmix information just changes its path exported.That is the frequency by changing local oscillation signal just can regulate the output channel of input signal easily, uses more convenient, flexible.
Accompanying drawing explanation
Fig. 1 is the schematic diagram utilizing switch matrix to form signal transmission passage in prior art;
Fig. 2 is the schematic diagram of the embodiment one of signal transmitting apparatus of the present invention;
Fig. 3 is the schematic diagram of the embodiment two of signal transmitting apparatus of the present invention;
Fig. 4 is the structural representation of a kind of embodiment of magnetic resonance imaging system of the present invention.
Detailed description of the invention
As described in the background art, when adopting traditional switch matrix to form signal transmission passage, required number of switches is huge, also needs a large amount of FPGA to control these switches simultaneously.Such structure is complex structure on the one hand, takies larger space; Radio circuits a large amount of on the other hand brings difficulty also can to the coupling of each passage.
As an example particularly, suppose that the signal transmission pathway of prior art comprises 72 tunnels inputs, 48 output, when so employing switch matrix realizes Signal transmissions, need 1728 switches (72 × 48/2=1728); In order to control the closed of these 1728 switches or disconnect, then need 3456 control signals, so need tens FPGA to realize these control signals the most at last.
In signal transmitting apparatus of the present invention, multiple frequency mixer is respectively used to carry out mixing to input signal, thus form all not identical signal of channelized frequencies, then the signal that the frequency after these mixing is all not identical is transmitted by signal combiner unit, the signal fallen in its band connection frequency exports by band filter, carry out only by a road signal transmission passage between described band filter and signal combiner unit, thus simplify its structure, reduce the complexity of channel selecting.
Still be exemplified as example with above-mentioned, in the present invention, only need 72 frequency mixers, 48 band filters and signal combiner units, described 72 frequency mixers are corresponding respectively to be received 72 road input signals and carries out mixing with respective local oscillation signal, signal combiner unit is by mixed frequency signal all not identical for channelized frequencies by a road signal transmission passage transmission, and the mixed frequency signal that the band filter that 48 mid frequencyes are all not identical will fall in its band connection frequency respectively exports.So just achieve the selection of signal path and the transmission of signal.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public detailed description of the invention.
Fig. 2 shows the schematic diagram of the embodiment one of signal transmitting apparatus of the present invention.With reference to figure 2, described signal transmitting apparatus comprises: multiple frequency mixer, signal combiner unit 200, multiple band filter and multiple demodulator of PM signal PM.
Described multiple frequency mixer comprises first input end, the second input and outfan respectively, described first input end is for receiving input signal, second input is for receiving local oscillation signal, and outfan is used for the mixed frequency signal of input signal and local oscillation signal to export.Wherein, the mid frequency of each local oscillation signal is all not identical.
Particularly, in the present embodiment, described frequency mixer comprises the first frequency mixer 101 ~ the N frequency mixer 10N.Each frequency mixer is a corresponding input signal and a local oscillation signal respectively, and corresponding output mixed frequency signal.Such as, in the present embodiment, the first frequency mixer 101 is corresponding first input signal and the first local oscillation signal respectively, its corresponding output first mixed frequency signal; And the corresponding N input signal of N frequency mixer 10N and N local oscillation signal, and corresponding output N mixed frequency signal.And the mid frequency of described first local oscillation signal ~ the N local oscillation signal is all not identical, the frequency of the mixed frequency signal (the first mixed frequency signal ~ the N mixed frequency signal as in Fig. 2) of each frequency mixer correspondence output is all not identical yet like this, thus can only transfer out by a signal paths.
Described signal combiner unit 200 carries out conjunction road for the multiple mixed frequency signals sent by multiple frequency mixer, and transfers to multiple band filter by a bars transmission channel.
Particularly, described signal combiner unit 200 comprises multiple band elimination filter (the first band elimination filter 201 ~ the N band elimination filter 20N as shown in Figure 2), the input of described multiple band elimination filter is connected respectively the outfan of multiple frequency mixer, for receiving mixed frequency signal; The outfan of described multiple band elimination filter is connected to together (the node A in Fig. 2), jointly for transmitting multiple mixed frequency signal simultaneously.
Described band filter is used for the mixed frequency signal fallen in its corresponding band connection frequency to export; Wherein, the band connection frequency of each band filter is all not identical.
Particularly, with reference to figure 2, the input of described band filter (the first band filter 301 ~ the M band filter 30M) links together (Node B as in Fig. 2) jointly, for receiving multiple mixed frequency signals of described signal combiner unit 200 transmission; The outfan of described multiple band filter is used for the mixed frequency signal fallen in its corresponding band connection frequency to export.
Described multiple demodulator of PM signal PM (the first demodulator of PM signal PM 401 ~ the M demodulator of PM signal PM 40M as shown in Figure 2) is connected respectively the outfan of multiple band filter, carries out demodulation for the signal exported described band filter.
After demodulator of PM signal PM demodulation, final each signal exported is identical with initial input signal.Signal after demodulation exports in late-class circuit by described demodulator of PM signal PM, thus is processed accordingly it by late-class circuit.
In the present embodiment, Signal transmissions is carried out by a cable between described signal combiner unit 200 and multiple band filter.Multiple mixed frequency signals that signal combiner unit 200 is closed road by this cable are sent to band filter simultaneously.The signal falling into its band connection frequency exports by described band filter more respectively.
Certainly, in other embodiments, between described signal combiner unit 200 and band filter, wirelessly Signal transmissions can also be carried out, such as, transmission and the reception of signal can be carried out by a pair antenna.Particularly, multiple mixed frequency signals that described signal combiner unit 200 is received by antenna send, and are then received by the respective antenna of band filter one end, are finally exported by the signal fallen in its band connection frequency by band filter.
It should be noted that, the quantity of described frequency mixer can be greater than or equal to the quantity of described band filter.In some practical application, conveniently acquired signal, may need to arrange multiple signal pickup assembly, and these signal pickup assemblies can't use simultaneously, that is, may only need selection portion sub-signal harvester to carry out the collection of signal in actual applications, the signal collected enters into output channel (band filter) after the mixing of frequency mixer.Therefore in actual applications, the number needs of frequency mixer is equal with the quantity of signal pickup assembly, and the quantity of band filter can suitably reduce according to actual needs.
As an object lesson, in the present embodiment, the quantity of described frequency mixer is 72, and the quantity of band filter is 48.By reference to the accompanying drawings the operation principle of signal transmitting apparatus of the present invention is described further again below.
First suppose in the present embodiment, only have 48 by choice for use in described frequency mixer, other frequency mixer is not used.In this case, have 48 road input signals to need transmission, so just need 48 tunnel output channels, the band filter that is as output channel is all used.
The bandwidth of 48 band filters is set to 1MHz, and its mid frequency is fixed, set gradually as 65.8MHz, 68.8MHz, 71.8MHz ..., 206.8MHz.Under this configuration, the band connection frequency of band filter 300 is followed successively by: 64.8MHz ~ 66.8MHz, 67.8MHz ~ 69.8MHz, 70.8MHz ~ 72.8MHz ..., 205.8MHz ~ 207.8MHz.
In this concrete example; simple in order to arrange; handled easily; each band filter is set to identical bandwidth, is namely 1MHz, but it should not limit the scope of the invention; in other embodiments; can also do other to the bandwidth of each band filter or band connection frequency according to actual needs to arrange, as long as the band connection frequency of each band filter is different, the present invention does not limit it.
In order to make 48 road input signals all can effectively export, needing to carry out frequency inverted to each input signal, thus the frequency of mixed frequency signal is corresponded respectively within the passband frequency range of band filter.Particularly, in the present embodiment, by frequency mixer, mixing (frequency inverted) is carried out to form multiple mixed frequency signal to each input signal.
Such as, the first band filter 301 that it is 65.8MHz that first input signal wants via mid frequency exports, it just must being greater than 64.8MHz and being less than in the scope of 66.8MHz via the frequency after the first frequency mixer 101 mixing, otherwise the first band filter 301 cannot be filtered out.
Similarly, another input signal, it is export in the M band filter 30M of 206.8MHz that such as N input signal wants via mid frequency, and the frequency after its mixing just must being greater than 205.8MHz and being less than in the scope of 207.8MHz.
In the present embodiment, a signal paths (cable or a pair antenna) is only needed to carry out the transmission of signal between the signal combiner unit 200 of signal transmitting apparatus and band filter, its structure is simple, also reduces the complexity of Signal transmissions.
On the other hand, because signal transmitting apparatus of the present invention no longer needs a large amount of FPGA, it also avoid the matching problem that radio circuit brings to every bar path.
In addition, in the present embodiment, described signal combiner unit 200 comprises multiple band elimination filter, described multiple band elimination filter is corresponding respectively receives multiple mixed frequency signal, because each band elimination filter can only get rid of the mixed frequency signal receiving other frequencies by a mixed frequency signal, so just can multichannel mixed frequency signal be carried out mutually isolated, avoid the mutual interference between multichannel mixed frequency signal.
Fig. 3 shows the schematic diagram of the embodiment two of signal transmitting apparatus of the present invention.With reference to figure 3, described signal transmitting apparatus comprises: multiple frequency mixer, signal combiner unit 200, multiple band filter, multiple demodulator of PM signal PM and multiple local oscillation signal generation unit.
The difference part of the present embodiment and embodiment one is: described signal transmitting apparatus also comprises multiple local oscillation signal generation unit.Similar in the present embodiment in the structure of other parts and embodiment one, therefore do not repeat them here.In the present embodiment, described multiple local oscillation signal generation unit is connected respectively multiple frequency mixer.Such as, the first local oscillation signal generation unit 501 correspondence connects the first frequency mixer 101, and N local oscillation signal generation unit 50N correspondence connects N frequency mixer 10N.
Described local oscillation signal generation unit is for exporting local oscillation signal, and the frequency of the local oscillation signal exported is regulated according to conditioning signal, the mixed frequency signal exported to make frequency mixer switches to object tape bandpass filter and exports, wherein, described conditioning signal is relevant to the band connection frequency of described object tape bandpass filter.
After adjustment by local oscillation signal generation unit, the frequency of the mixed frequency signal corresponding to each input signal can correspondingly change, when in the frequency of mixed frequency signal to be changed to another band filter band connection frequency by the band connection frequency of a band filter, the output channel of the input signal of its correspondence just there occurs change.In other words, by local oscillation signal generation unit, local oscillation signal is regulated, finally can realize any switching laws of the output channel of input signal.
As an object lesson, in actual applications, described first input signal may be needed to be exported by any one band filter, at this moment regulate according to first local oscillation signal of practical situation to the first frequency mixer with regard to needing, particularly, can be regulated by the first local oscillation signal generation unit 501 corresponding to the first frequency mixer 101, thus the first mixed frequency signal of the first input signal is fallen in the band connection frequency of required output channel (i.e. object tape bandpass filter).
More specifically, the adjustment process particularly of the first local oscillation signal generation unit 501 is: the output channel first determining the first input signal, and such as its output channel is M band filter 30M, and that is M band filter 30M is object tape bandpass filter.
The frequency range of the first mixed frequency signal is drawn again according to the band connection frequency of object tape bandpass filter (M band filter 30M).In fact, the frequency range of mixed frequency signal can be less than or equal to the scope of band passband rate.Because the band passband rate of M band filter 30M is 205.8MHz ~ 207.8MHz, therefore, the frequency range of the first mixed frequency signal can be 205.8MHz ~ 207.8MHz; Also can within the scope of 205.8MHz ~ 207.8MHz, such as, can be 206MHz ~ 207MHz.In this example embodiment, the frequency range of getting the first mixed frequency signal is 205.8MHz ~ 207.8MHz.
Then, the frequency range of the first local oscillation signal is drawn by the frequency range of the first mixed frequency signal and the frequency computation part of the first input signal.Suppose that the frequency of the first input signal is 50.8MHz, so the frequency range of the first local oscillation signal is 155MHz ~ 157MHz, i.e. (205.8MHz-50.8MHz) ~ (207.8MHz-50.8MHz).
Finally, by the first local oscillation signal generation unit 501 generated frequency scope be first local oscillation signal of 155MHz ~ 157MHz.Like this, the mixed frequency signal that the first input signal generates after the first frequency mixer 101 carries out frequency inverted just can be exported by object tape bandpass filter (M band filter 30M).
As can be seen from above process, the local oscillation signal of frequency mixer not immobilizes, but can be undertaken changing by local oscillation signal generation unit, the frequency of mixed frequency signal so just can be made to fall in the band connection frequency of any band filter.Thus just can realize any switching laws of input signal in band filter (output channel) and the method is fairly simple, easily operate.
Correspondingly, present invention also offers a kind of magnetic resonance imaging system.Particularly, with reference to figure 4, described magnetic resonance imaging system comprises: acquisition of magnetic resonance signals device 700, signal transmitting apparatus 800 and multiple signal processing apparatus 900.
Described acquisition of magnetic resonance signals device 700, for gathering imaging features signal; Described signal transmitting apparatus 800 connects described acquisition of magnetic resonance signals device 700, transmits for the imaging features signal collected acquisition of magnetic resonance signals device 700; Described signal processing apparatus 900 connects described signal transmitting apparatus 800, for processing the imaging features signal received.
Described signal transmitting apparatus 800 can adopt any one signal transmitting apparatus above-mentioned, and it does not repeat them here.
Adopt any one signal transmitting apparatus above-mentioned to not only simplify the structure of system, reduce the complexity of Signal transmissions, but also the mutual interference between multiple signals can be avoided.In addition, when described signal transmitting apparatus comprises local oscillation signal generation unit, any selection of the output channel of signal can also be realized, use more convenient, flexible.
Described acquisition of magnetic resonance signals device 700 is for the scanning at the positions such as head, upper limb, lower limb, and it scans the signal obtained and is imaging features signal.Particularly, described acquisition of magnetic resonance signals device 700 can comprise magnet, gradient coil, radio-frequency sending coil and RF receiving coil.Described magnet has the cavity for placing sample, described magnet is for generation of main field; Described gradient coil for generation of the gradient selecting layer direction, phase-encoding direction and readout direction, thus carries out space orientation to sample; Described radio-frequency sending coil and RF receiving coil are positioned over around cavity, and described radio-frequency sending coil brings the magnetization vector of excited sample for launching RF pulse-to-pulse; Described receiving coil for receiving the signal of magnetization vector, to produce characteristic imaging signal.
Radio-frequency sending coil in acquisition of magnetic resonance signals device 700 can be arranged at different positions according to the position of its scanning is different with RF receiving coil, but acquisition of magnetic resonance signals device 700 scans the signal obtained all to be needed to transfer in respective signal processing apparatus, to carry out respective handling and finally to form medical image.
In described acquisition of magnetic resonance signals device 700, the quantity of RF receiving coil can equal the quantity of signal processing apparatus 900, such acquisition of magnetic resonance signals device 700 scans the imaging features signal obtained and will transmit via signal transmitting apparatus 800, is finally received by signal processing apparatus 900 and carries out respective handling.
Certainly, in actual applications, in described acquisition of magnetic resonance signals device 700, the quantity of RF receiving coil also can be greater than the quantity of described signal processing apparatus 900.
This is because, in actual applications, may need to be scanned multiple position by the acquisition of magnetic resonance signals device 700 of magnetic resonance imaging system, and receive the RF receiving coil of the imaging features signal of different parts and incomplete same, in order to easy to use, the RF receiving coil of all acquisition of magnetic resonance signals devices 700 may used in advance is just needed to arrange, such as, the RF receiving coil of scanning head is arranged at the top of sick bed, the RF receiving coil scanning upper limb and abdominal part is arranged at the middle part of sick bed, and the RF receiving coil of scanning lower limb is arranged at the below of sick bed.Like this, in actual applications, the scanning of different parts can be carried out according to different demands.
But, in actual applications, but do not need the sweep signal of all RF receiving coils to be transmitted simultaneously.Such as in a certain diagnosis, may only need the RF receiving coil using head scanning, and do not need the scanning of lower extremity, so now the imaging features signal of required transmission only comprises the sweep signal that the RF receiving coil that carries out head scanning obtains, and that is needs the signal transferred in signal processing apparatus 900 to be only a part of signal.Like this, too many signal processing apparatus 900 just need not be set, but can according to the actual requirements or clinical experience the signal processing apparatus 900 of right quantity is set.
In order to simplied system structure, avoid unnecessary waste, normally, in magnetic resonance imaging system, the RF receiving coil quantity of acquisition of magnetic resonance signals device 700 is 72, and the quantity of signal processing apparatus 900 is 48.
With the quantity of the RF receiving coil of acquisition of magnetic resonance signals device 700 and signal processing apparatus 900 adaptably, the input of described signal transmitting apparatus 800 is equal with the quantity of acquisition of magnetic resonance signals device 700, and outfan is identical with the quantity of signal processing apparatus 900.Particularly, in described signal transmitting apparatus 800, the quantity of frequency mixer should equal the quantity of RF receiving coil, and the quantity of band filter and demodulator of PM signal PM should equal the quantity of signal processing apparatus 900.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (7)
1. a signal transmitting apparatus, is characterized in that, comprising: signal combiner unit, multiple frequency mixer, multiple band filter and multiple demodulator of PM signal PM;
Described multiple frequency mixer comprises first input end, the second input and outfan respectively, described first input end is for receiving input signal, second input is for receiving local oscillation signal, and outfan is used for the mixed frequency signal of input signal and local oscillation signal to export; The mid frequency of described local oscillation signal is all not identical;
Described signal combiner unit comprises multiple band elimination filter, and the input of described multiple band elimination filter is connected respectively the outfan of multiple frequency mixer, for receiving mixed frequency signal; The outfan of described multiple band elimination filter is connected to together jointly, for transmitting multiple mixed frequency signal simultaneously;
The input of described multiple band filter links together jointly, for receiving multiple mixed frequency signals of described signal combiner unit transmission; The outfan of described multiple band filter is used for the mixed frequency signal fallen in its corresponding band connection frequency to export, and the band connection frequency of each band filter is all not identical;
Described multiple demodulator of PM signal PM is connected respectively the outfan of multiple band filter, carries out demodulation for the signal exported described multiple band filter.
2. signal transmitting apparatus as claimed in claim 1, is characterized in that, carry out Signal transmissions between described signal combiner unit and multiple band filter by a cable.
3. signal transmitting apparatus as claimed in claim 1, is characterized in that, carry out Signal transmissions between described signal combiner unit and multiple band filter by a pair antenna.
4. signal transmitting apparatus as claimed in claim 1, it is characterized in that, the bandwidth of described multiple band filter is identical.
5. signal transmitting apparatus as claimed in claim 1, it is characterized in that, also comprise multiple local oscillation signal generation unit, described multiple local oscillation signal generation unit is connected respectively multiple frequency mixer, for exporting local oscillation signal, and the frequency of the local oscillation signal exported is regulated according to conditioning signal, switch to object tape bandpass filter with the mixed frequency signal making described multiple frequency mixer export and export; Described conditioning signal associates with the band connection frequency of described object tape bandpass filter.
6. a magnetic resonance imaging system, is characterized in that, comprising: acquisition of magnetic resonance signals device, signal transmitting apparatus described in any one of Claims 1 to 5 and multiple signal processing apparatus, and described acquisition of magnetic resonance signals device, for gathering imaging features signal; Described signal transmitting apparatus connects described acquisition of magnetic resonance signals device, transmits for the imaging features signal collected acquisition of magnetic resonance signals device; Described signal processing apparatus connects described signal transmitting apparatus, for processing the imaging features signal received.
7. magnetic resonance imaging system as claimed in claim 6, it is characterized in that, described acquisition of magnetic resonance signals device comprises magnet, gradient coil, radio-frequency sending coil and RF receiving coil, and wherein, the quantity of described RF receiving coil is greater than the quantity of described signal processing apparatus.
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Effective date of registration: 20191213 Address after: 430000 22 / F, building C3, future technology building, No. 999, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Zhongke Medical Technology Industrial Technology Research Institute Co., Ltd Address before: 201210 Shanghai City, Pudong New Area Zhangjiang Road No. 99, No. 3, Haike Building 5 floor Patentee before: Shanghai United Imaging Healthcare Co., Ltd. |
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