The content of the invention
Based on this, it is necessary to for the transaudient efficiency of the earphone applied to magnetic resonance system in traditional magnetic resonance equipmentA kind of the problem of low, lower tone, there is provided earphone applied to magnetic resonance system.
A kind of earphone applied to magnetic resonance system, including：
Amplifying circuit, for being amplified to the audio signal of input；And
Loudspeaker, is connected to the output terminal of the amplifying circuit, the amplifying circuit for analog circuit and or described raise one's voiceDevice is made of nonmagnetic substance.
In one of the embodiments, the loudspeaker includes piezoelectric ceramic loudspeaker.
In one of the embodiments, the amplifying circuit includes voltage follower circuit and power amplification circuit, the electricityPressure follows the output terminal of circuit to be connected with the input terminal of the power amplification circuit, the output terminal connection of the power amplification circuitIn the loudspeaker.
In one of the embodiments, the amplifying circuit further includes capacitance C1.The capacitance C1 is connected to the voltageFollow circuit.
In one of the embodiments, the power amplification circuit includes：
The first power amplification circuit and the second power amplification circuit of the voltage follower circuit output terminal are connected to, it is describedThe output terminal of the output terminal of first power amplification circuit and second power amplification circuit is connected with the loudspeaker respectively.
In one of the embodiments, first power amplification circuit includes：
First power amplifier, the reverse input end of first power amplifier are defeated with first power amplifierOutlet connects, and the positive input of first power amplifier is connected with the output terminal of the voltage follower circuit.
In one of the embodiments, second power amplification circuit includes：
Second power amplifier；
Resistance R3, is connected to the output terminal of the voltage follower circuit and the reverse input end of second power amplifierBetween；
Resistance R4, is connected to the output of the reverse input end and second power amplifier of second power amplifierBetween end.
In one of the embodiments, further include and be connected to first power amplification circuit, second power amplificationConducting wire between circuit and the loudspeaker, the material of the conducting wire is carbon fiber.
A kind of magnetic resonance system, including：
The earphone applied to magnetic resonance system；
Magnet, including scanning through hole
Sick bed, the scanning through hole is passed in and out for delivering patient；
The amplifying circuit is arranged at the end face of the magnet, the inner wall of the scanning through hole or the sick bed.
In one of the embodiments, it is described so sick bed includes fixing bracket and the bed board that can be moved along fixing bracketAmplifying circuit is arranged at the fixing bracket.
Earphone provided by the invention applied to magnetic resonance system includes amplifying circuit, loudspeaker.The amplifying circuit is usedIt is amplified in the audio signal to input.The loudspeaker is connected to the output terminal of the amplifying circuit, the amplifying circuitIt is made of analog circuit and or described loudspeaker of nonmagnetic substance, therefore can be to avoid band during digital power amplifier driving loadThe electromagnetic interference come, the compatibility of the enhancing earphone and magnetic resonance equipment for being applied to magnetic resonance system, improves transaudient efficiency.
Brief description of the drawings
Fig. 1 is the circuit diagram of the earphone provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 2 is another circuit diagram of the earphone provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 3 is the Headphone structure figure provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 4 is a kind of magnetic resonance system structure chart provided in an embodiment of the present invention.
Fig. 5 is a kind of magnetic resonance system another kind structure chart provided in an embodiment of the present invention.
Main element symbol description
Earphone 10 applied to magnetic resonance system
Amplifying circuit 100
Voltage follower circuit 110
Voltage follow operational amplifier 111
Power amplification circuit 200
First power amplification circuit 210
First power amplifier 211
Second power amplification circuit 220
Second power amplifier 221
Loudspeaker 300
Conducting wire 400
Current-limiting resistance 500
Sick bed 600
Fixing bracket 610
Bed board 620
Magnet 800
Scan through hole 810
Magnetic resonance system 20
Embodiment
In order to which goal of the invention, technical solution and the technique effect of the present invention is more clearly understood, below in conjunction with attached drawing pairThe specific embodiment of the present invention is described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,It is not intended to limit the present invention.
Fig. 1 is referred to, the present invention provides a kind of earphone 10 applied to magnetic resonance system.It is described to be applied to magnetic resonance systemEarphone 10 include amplifying circuit 100, loudspeaker 300.The amplifying circuit 100 is used to put the audio signal of inputGreatly.The loudspeaker 300 is connected to the output terminal of the amplifying circuit 200.The amplifying circuit 100 for analog circuit and orThe loudspeaker is made of nonmagnetic substance.The audio signal can come from operation room.The doctor of operation room will can refer toAudio signal is made to be transferred to patient by the earphone 10 applied to magnetic resonance system.In the process of the audio signal transmissionIn, Gain tuning and noise reduction process can also be carried out to the audio signal.The power amplification circuit 200 is analog circuitHe or described loudspeakers using nonmagnetic substance be made can be to avoid digital power amplifier driving load when the electromagnetic interference brought, increaseThe strong earphone 10 applied to magnetic resonance system and the compatibility of magnetic resonance equipment, improve transaudient efficiency.
In one of the embodiments, the amplifying circuit 100 includes voltage follower circuit 110 and power amplification circuit200.The output terminal of the voltage follower circuit 110 is connected with the input terminal of the power amplification circuit 200, the power amplificationThe output terminal of circuit 200 is connected to the loudspeaker 300.The power amplification circuit 200 is pure analog circuit.The voltage withAudio signal can be received with circuit 100, and input impedance can be increased, reduce output impedance.The power amplification circuit 200 canTo amplify the audio signal.
Fig. 3 is referred to, the earphone applied to magnetic resonance system can include two loudspeakers 300.The loudspeakerIt can be connected successively with power amplification circuit 200, voltage follower circuit 100 respectively.Right part is applied to magnetic resonance system in figureThe Headphone structure of system is identical with left part.Described two loudspeakers 300 can be by connecting band connection.
In one of the embodiments, the loudspeaker 300 includes piezoelectric ceramic loudspeaker.The piezoelectric ceramic loudspeakerFor material nonmagnetic or without magnetic conductance.The piezoelectric ceramic loudspeaker will not be produced by the wind of the magnet absorption in magnetic resonance equipmentDanger, will not have an impact the normal work of magnetic resonance equipment.
In one of the embodiments, the amplifying circuit 100 further includes capacitance C1.The capacitance C1 is connected to the electricityPressure follows circuit 110.The capacitance C1 can filter direct current.
With continued reference to shown in Fig. 1, in one of the embodiments, the voltage follower circuit 110 is transported including voltage followCalculate amplifier 111, resistance R1, resistance R2.The resistance R1 is connected to the reverse input of the voltage follow operational amplifier 111End.The resistance R2 is connected to the reverse input end of the voltage follow operational amplifier 111 and the voltage follow computing is putBetween the output terminal of big device 111.The positive input of the voltage follow operational amplifier 111 is connected to bias voltage VBias.Ratio by adjusting the resistance R2 and the resistance R1 can change the voltage follow operational amplifier 111 to the soundThe amplification factor of frequency signal.In one of the embodiments, the voltage follow operational amplifier 111 to the audio signal intoRow 1:1 ratio enlargement.
In one of the embodiments, the voltage follower circuit 100 further includes capacitance C1.The capacitance C1 passes through describedResistance R1 is connected to the reverse input end of the voltage follow operational amplifier 111.The capacitance C1 is used to input the audioSignal.The capacitance C1 can filter the DC component in the audio signal.
In one of the embodiments, the power amplification circuit 200 includes the first power amplification circuit 210 and the second work(Rate amplifying circuit 220.First power amplification circuit 210 and second power amplification circuit 220 are connected to the voltageFollow 110 output terminal of circuit.The output terminal of first power amplification circuit 210 and second power amplification circuit 220Output terminal is connected with the loudspeaker 300 respectively, is respectively used to positive amplification and reversely amplification.First power amplification circuit210 and second power amplification circuit 220 audio signal can be amplified, then drive the loudspeaker 300Make a sound.In one of the embodiments, first power amplification circuit 210 can be to the audio signal forward direction 1:1Amplification.Second power amplification circuit 220 can reverse to the audio signal 1:1 amplification.The first power amplification electricityRoad 210 inputs positive voltage signal for the loudspeaker 300.Second power amplification circuit 220 inputs for the loudspeaker 300Negative voltage signal.
In one of the embodiments, first power amplification circuit 210 includes the first power amplifier 211.It is describedThe reverse input end of first power amplifier 211 is connected with the output terminal of first power amplifier 211.First powerThe positive input of amplifier 211 is connected with the output terminal of the voltage follower circuit 110.First power amplifier 211Can be to the audio signal forward direction 1:1 amplification.
Refering to what is shown in Fig. 2, in another embodiment, the reverse input end of first power amplifier 211 and described theResistance R5, R6 one end ground connection, first power amplifier 211 of termination can be connected between the output terminal of one power amplifier 211Reverse input end.The output terminal of first power amplifier 211 can pass sequentially through the resistance R5 and resistance R6 and connectGround.Output voltage Vout=Vin* (R5+R6)/R6 of first power amplifier 211., can be with by the setting of R5 and R6Amplification factor of first power amplifier 211 to the audio signal is adjusted, when needs 1:During 1 amplification, the value of R5 is zero.
In one of the embodiments, first power is can be used alone in the power amplification circuit 200 to putBig device 211.When only using first power amplifier 211, the cathode of the loudspeaker 300 can connect first powerThe output terminal of amplifier 211.The anode of the loudspeaker 300 can be grounded.
In one of the embodiments, first power amplifier 211 can also set resistance to adjust described firstThe amplification factor of power amplifier 211.
In one of the embodiments, the reverse input end of first power amplifier 211 and first power are putThe resistance for adjusting 211 amplification factor of the first power amplifier can be connected between the output terminal of big device 211.
In one of the embodiments, second power amplification circuit 220 includes the second power amplifier 221, resistanceR3, resistance R4.The resistance R3 is connected to the output terminal of the voltage follower circuit 110 and second power amplifier 221Reverse input end between.The resistance R4 is connected to the reverse input end and described second of second power amplifier 221Between the output terminal of power amplifier 221.Second power amplifier 221 can reverse to the audio signal 1:1 amplification.Ratio by adjusting the resistance R4 and resistance R3 can adjust second power amplifier 221 to the audio signalAmplification factor.The positive input of second power amplifier 221 can also access the bias voltage VBias.WhereinIn one embodiment, second power amplifier 221 is can be used alone in the power amplification circuit 200.Only useDuring second power amplifier 221, the anode of the loudspeaker 300 can connect the defeated of second power amplifier 221Outlet.The anode of the loudspeaker 300 can be grounded.
In one of the embodiments, the earphone 10 applied to magnetic resonance system, which further includes, is connected to first work(Conducting wire 400 between rate amplifying circuit 210, second power amplification circuit 220 and the loudspeaker 300.The conducting wire 400Material be carbon fiber.The conducting wire 400 that carbon fiber makes can be to avoid plain conductor 400 to magnetic resonance equipment signal acquisition coilParameter impact, the interference signal that radiofrequency field, gradient fields produce on plain conductor 400 can also be avoided to audio signalProduce interference.
In one of the embodiments, it is described to further include two current-limiting resistances 500.First power amplification circuit 210Output terminal and the output terminal of second power amplification circuit 220 raised respectively by a current-limiting resistance 500 with describedSound device 300 connects.The current-limiting resistance 500 can limit the size of electric current, the size of the current-limiting resistance 500 and conducting wire 400 withAnd the driving power of loudspeaker 300 is related.
In one of the embodiments, the power amplification circuit 200 can be raised by way of wireless telecommunications with describedSound device 300 connects.
The embodiment of the present invention provides a kind of magnetic resonance system 20.The magnetic resonance system 20 is total to including described applied to magneticEarphone 10, magnet 800, the sick bed 600 of vibrating system.The magnet 800 includes scanning through hole 810.The scanning through hole 810 is used forDeliver patient's disengaging scanning through hole 810.The sick bed 600 is used to carry out magnetic resonance to the human body for entering the scanning through holeCheck.For delivering patient's disengaging scanning through hole 810.The amplifying circuit 100 can be arranged at the scanning through hole 810Inner wall or the sick bed 600.Fig. 3 is referred to, in one of the embodiments, the amplifying circuit 100 can be arranged at diseaseBed 600.The amplifying circuit 100 can be moved together with sick bed, to improve work efficiency.In one of the embodiments, instituteThe both ends of the sick bed 600 can be arranged at by stating amplifying circuit 100.Including head of a bed portion and tailstock portion.The amplifying circuit 100 is setThe space of the sick bed 600 can be made full use of by being placed in the head of a bed portion or the tailstock portion.
In one of the embodiments, the loudspeaker 300 can pass through the conducting wire 400 and the amplifying circuit 100Connection.
In one of the embodiments, the sick bed 600 includes the fixing bracket 620 being fixedly installed relative to ground, withAnd it is supported on the fixing bracket 610 and can be moved along the fixing bracket 610 to pass in and out the bed board of the scanning through hole 810620.The amplifying circuit 100 is arranged on the fixing bracket 610 or the bed board 620.When the amplifying circuit 100 is setWhen the fixing bracket 610, since the fixing bracket 610 will not be moved with the movement of bed board 620, so being put when describedWhen big circuit 100 be connected with loudspeaker 300 using conducting wire 400, avoid movement due to bed board 620 and so that bed board 620 andInterfered between conducting wire 400.
In one of the embodiments, the outside of conducting wire 400 has protection pipe sleeve, for protecting conducting wire 400 or dust-proof.
Fig. 4 is referred to, in one of the embodiments, the amplifying circuit 100 can be arranged at the scanning through hole 810Inner wall.The incorporating section for storing the conducting wire 400 can be provided with the scanning through hole 810 or on the sick bed 600.The incorporating section can have the pivot structure for being used for winding the conducting wire 400.In one of the embodiments, the incorporating sectionWith the structure to fit with scanning 810 inner wall of through hole or sick bed 600.
In one of the embodiments, the current-limiting resistance 500 can be arranged at described together with the amplifying circuit 100Sick bed 600 or the inner wall for scanning through hole, can also be set together with the loudspeaker 300.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another elementOr there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected toTo another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,There is no intermediary element.Term as used herein " vertically ", " horizontal ", "left", "right" and similar statement areFor illustrative purposes.
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneouslyTherefore the limitation to the scope of the claims of the present invention cannot be interpreted as.It should be pointed out that for those of ordinary skill in the artFor, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present inventionProtect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.