CN203480011U - Magnetic resonance imaging device - Google Patents
Magnetic resonance imaging device Download PDFInfo
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- CN203480011U CN203480011U CN201320520041.4U CN201320520041U CN203480011U CN 203480011 U CN203480011 U CN 203480011U CN 201320520041 U CN201320520041 U CN 201320520041U CN 203480011 U CN203480011 U CN 203480011U
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Abstract
The utility model provides a magnetic resonance imaging device which is capable of reducing attenuation of an MR signal outputted from an RF coil. The magnetic resonance imaging device comprises a magnet used by a static magnetic field, an inclined magnetic field coil, a high frequency coil, a support bench, a reception substrate, and a signal processing system. The magnet used by the static magnetic field forms a static magnetic field in a shooting area. The inclined magnetic field coil forms an inclined magnetic field in the shooting area. The high frequency coil receives magnetic resonance signals generated from a to be detected object in the shooting area on which the static magnetic field and the inclined magnetic field are formed. The support bench is provided with a cylinder shell, which is used for accommodating the inclined magnetic field coil and the magnet used by the static magnetic field. The reception substrate includes an A/D converter, which is accommodated in the shell, and which carries out A/D conversion instead of frequency conversion for the magnetic resonance signals received by the high frequency coil. The signal processing system generates magnetic resonance image data according to the A/D converted magnetic resonance signals.
Description
Technical field
Embodiment of the present utility model relates to magnetic resonance imaging (MRI:Magnetic Resonance Imaging) device.
Background technology
MRI device is that high frequency (RF:radio frequency) signal according to Larmor frequency magnetically excites the nuclear spin that is positioned over the subject in static magnetic field, according to being accompanied by this, excites magnetic resonance (MR:magnetic resonance) signal producing to rebuild the image diagnosing system of image.
In MRI device, for generating the RF waveform generating circuit of RF signal and the Machine Room that RF amplifier (amplifier) is configured in the outside, photographic studio that is provided with the pallet (frame) that comprises static field magnet.And, after the RF signal of exporting amplifies RF amplifier, via the wave filter panel being arranged between photographic studio and Machine Room, impose on (WB:whole body) coil for whole body from RF waveform generating circuit.Thus, as RF magnetic field, from WB coil to camera watch region, irradiate RF signal.
On RF amplifier, general connection exchanges (AC:Alternating Current) power supply, in inside, AC/DC switch power supply is set.And the AC voltage of supplying with to RF amplifier is converted into desirable direct current (DC:Direct Current) voltage, RF amplifier moves according to DC voltage.
Patent documentation 1: TOHKEMY 2011-72390 communique
Utility model content
In RF signal generating system in the past, be arranged at the RF amplifier in Machine Room and be arranged at the distance between the WB coil in photographic studio, need to connect RF amplifier and WB coil via multi-cable or connector.Therefore the problem that, exists the level (level) of RF signal to decay in cable or connector.Its result, needs the high RF amplifier of specified output.
On the other hand, though in the receiving system of MR signal for amplifying from receiving the back segment of prime amplifier of MR signal of the RF coil output of use, also to connect the reception substrate possessing as the RF amplifier of variable gain.Thereby MR signal can be decayed according to receiving the RF amplifier of substrate and the distance between prime amplifier.
Therefore, the purpose of this utility model is, a kind of MR imaging apparatus that can reduce the decay of the MR signal of exporting from RF coil is provided.
The related MR imaging apparatus of embodiment of the present utility model possesses magnet for static magnetic field, gradient magnetic field coil, radio-frequency coil, pallet, reception substrate and signal processing system.Static magnetic field forms static magnetic field with magnet at camera watch region.Gradient magnetic field coil forms leaning magnetic field at above-mentioned camera watch region.Radio-frequency coil receives the magnetic resonance signal producing from subject in having formed the above-mentioned camera watch region of above-mentioned static magnetic field and above-mentioned leaning magnetic field.Pallet has the tubular shell of taking in above-mentioned gradient magnetic field coil and above-mentioned static magnetic field use magnet.Receive substrate and comprise and be accommodated in above-mentioned housing, the above-mentioned magnetic resonance signal being received by above-mentioned radio-frequency coil is not carried out to frequency inverted and the A/D converter that carries out A/D conversion.Signal processing system generates magnetic resonance image data according to the above-mentioned magnetic resonance signal after above-mentioned A/D conversion.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the related MR imaging apparatus of the 1st embodiment of the present utility model.
Fig. 2 mean the substrate that possesses respectively in the inside of the 1st amplifier shown in Fig. 1 and the 2nd amplifier towards with magnetic flux line towards the figure of an example of preference relation.
Fig. 3 means the figure of detailed structure example of the receiving system of the MR signal that comprises the 2nd signal amplifying system shown in Fig. 1.
Fig. 4 is the structural drawing of the related MR imaging apparatus of the 2nd embodiment of the present utility model.
Fig. 5 is the structural drawing of the related MR imaging apparatus of the 3rd embodiment of the present utility model
Fig. 6 is the figure of the detailed structure of the 1st amplifier shown in Fig. 5.
Fig. 7 is the structural drawing of the related MR imaging apparatus of the 4th embodiment of the present utility model.
Fig. 8 is the structural drawing of the related MR imaging apparatus of the 5th embodiment of the present utility model
Fig. 9 is the structural drawing of the related MR imaging apparatus of the 6th embodiment of the present utility model.
Figure 10 means the side view of pallet of an example of the allocation position of the 1st amplifier shown in Fig. 9 and the 2nd amplifier.
Figure 11 is the structural drawing of the related MR imaging apparatus of the 7th embodiment of the present utility model.
Figure 12 is the left side view of the pallet shown in Figure 11.
Description of reference numerals
1,1A, 1B, 1C, 1D, 1E ... MR imaging apparatus; 2,2A, 2B, 2C, 2D ... the 1st signal amplifying system; 3,3A, 3B ... the 2nd signal amplifying system; 4 ... imaging system; 5 ... WB coil; 6 ... gradient magnetic field coil; 7 ... static magnetic field magnet; 8 ... receive the RF coil of use; 8A ... coil part; 9 ... bed; 10 ... control system; 11 ... signal processing system; 12 ... pallet; 13 ... the 1st amplifier; 14 ... the 1st power supply; 15 ... the 2nd amplifier; 16 ... the 2nd power supply; 17 ... substrate; 18 ... signal cable; 19 ... AC source power supply; 20A, 20B ... voltmeter; 21 ... send waveform generating unit; 22 ... wave filter panel; 23 ... wave filter; 24 ... ground wire; 25 ... prime amplifier group; 26 ... on-off circuit; 27 ... receive substrate; 28 ... A/D converter; 30 ... optical cable; 31 ... D/A converter; 40 ... control circuit; 41 ... amplifying circuit; 42 ... control device; 43 ... optical cable; 50 ... input signal divider; 51 ... differential amplifier; 60 ... demodulation system; 61 ... output signal divider; 62 ... directivity colligator; 63 ... A/D converter; 64 ... wave detector; 65 ... dummy load (dummy load); 70 ... RF signal transmitting unit; 71 ... MR signal receiving unit; 80 ... voltage supplying substrate; 81 ... control substrate; O ... subject; R ... shooting field; Φ ... magnetic flux line; L ... length direction; Z ... the direction of principal axis of magnet for static magnetic field.
Embodiment
With reference to the accompanying drawings of the related MR imaging apparatus of embodiment of the present utility model.
(the 1st embodiment)
Fig. 1 means the structural drawing of the MR imaging apparatus that the 1st embodiment of the present utility model is related.
Therefore, imaging system 4 possesses as RF signal sends the WB coil 5, gradient magnetic field coil 6 of the RF coil of use, static magnetic field for, magnet 7, MR signal receive use RF coil 8, beds 9, controller system 10 and signal processing system 11.WB coil 5 cylindraceous, gradient magnetic field coil 6 and static magnetic field are built in the pallet 12 that is arranged on photographic studio with magnet 7.In addition, the RF coil 8 of reception use is arranged at the camera watch region R forming in the hole of pallet 12.
WB coil 5 is for camera watch region R being applied to the RF coil of the transmission use in RF magnetic field.Wherein, in the hole of pallet 12, also sometimes with WB coil 5, the RF coil that sends use is differently set.At this, the situation that is WB coil 5 for the RF coil that sends use describes, but in the situation that the RF coil of the transmission use different from WB coil 5 is set is also identical.
The outside in the photographic studio that influence of magnetic field such as operation room that on the other hand, controller system 10 and signal processing system 11 are arranged on the Machine Room of MR imaging apparatus 1 or control desk is set have reduced.At this, the situation that the inscape of the outside MR imaging apparatus 1 that is arranged at photographic studio of take is arranged at Machine Room describes as example.
The 1st signal amplifying system 2 of transmitter side is to generate the RF signal that sends use, the system of generated RF signal being amplified and imposing on to WB coil 5 according to the control signal from controller system 10.On the other hand, the 2nd signal amplifying system 3 of receiver side is according to the control signal from controller system 10, from receiving the RF coil 8 of use, to obtain MR signal, the system that obtained MR signal is amplified and exported to signal processing system 11.
Therefore, the 1st power supply 14 that the 1st signal amplifying system 2 possesses the 1st amplifier 13 and supplies with electric power to the 1st amplifier 13, above-mentioned the 1st amplifier 13 amplifies RF signal and exports to the RF coil that sends use.Similarly, the 2nd power supply 16 that the 2nd signal amplifying system 3 possesses the 2nd amplifier 15 and supplies with electric power to the 2nd amplifier 15, above-mentioned the 2nd amplifier 15 amplifies MR signal.In these power supplys, preferably use Switching Power Supply, but be not limited thereto, also can use linear power supply etc.
The 1st amplifier 13 and the 2nd amplifier 15 are configured to, and can be arranged at respectively the photographic studio of MR imaging apparatus 1.For example, the 1st amplifier 13 and the 2nd amplifier 15 are protected by magnetic shielding, so that the effect of magnetic influence in can avoiding fully in photographic studio respectively.Therefore, the 1st amplifier 13 and the 2nd amplifier 15 are arranged at respectively the photographic studio that pallet 12 is set.As an example, the 1st amplifier 13 and the 2nd amplifier 15 can be arranged at respectively to the periphery of pallet 12.The 1st amplifier 13 and the 2nd amplifier 15 can also be by RF shielding protections, so that can avoid fully respectively the impact of the RF signal in photographic studio.
In addition, from avoiding the viewpoint of magnetic saturation, wish that with hollow coil and magnetic susceptibility be each coil part that at least one party with in core coil below setting forms composition the 1st amplifier 13 and the 2nd amplifier 15.Especially, if use hollow coil, really can avoid magnetic saturation.Wherein, use the abundant little band core coil of magnetic susceptibility also can avoid magnetic saturation.
In addition, from avoiding the viewpoint of magnetic saturation, also wish that the coil part of the magnetics such as iron core to comprising formation the 1st amplifier 13 and the 2nd amplifier 15 and at least one party in transformer arrange magnetic shielding part.
In addition, from avoiding the viewpoint of the effect of magnetic influence in photographic studio, preferably, to form not vertical with the direction of the magnetic flux being formed by the static field magnet mode of length direction of flat each substrate of the 1st amplifier 13 and the 2nd amplifier 15, configure each substrate.Most preferably with form the length direction of each substrate of the 1st amplifier 13 and the 2nd amplifier 15 become along magnetic flux towards the mode of direction configure each substrate.Thus, can carry out effective magnetic mask.
Fig. 2 mean substrate that the inside of the 1st amplifier 13 shown in Fig. 1 and the 2nd amplifier 15 possesses respectively towards with magnetic flux line towards the figure of an example of preference relation.
At static magnetic field with magnet 7 around, as shown in Figure 2, existing magnetic flux line Φ to seem is the region of straight line.Therefore, can make to form the length direction L of flat each substrate 17 of the 1st amplifier 13 and the 2nd amplifier 15 parallel with magnetic flux line Φ.Thus, can reduce the quantity towards the magnetic flux line Φ of the magnetic shield of covered substrate 17.
On the other hand, the 1st power supply 14 and the 2nd power supply 16 are arranged at respectively the Machine Room as outside, photographic studio.The 1st power supply 14 is connected via signal cable 18 with the 1st amplifier 13.Similarly, the 2nd power supply 16 is connected via signal cable 18 with the 2nd amplifier 15.And the 1st power supply 14 and the 2nd power supply 16 are configured to respectively, the AC voltage transitions of supplying with from AC source power supply 19 is become to DC voltage and supplies with electric power to the 1st amplifier 13 and the 2nd amplifier 15.
In addition, wish the 1st power supply 14 and the 2nd power supply 16 are configured to, can adjust output voltage according to the slippage of the voltage in signal cable 18 respectively.Now, can voltmeter 20A be set respectively at each signal cable 18 ends of the 1st amplifier 13 sides and the 2nd amplifier 15 sides, 20B, becomes the mode of controlling value with the value of voltmeter 20A, 20B, the 1st power supply 14 and the 2nd power supply 16 are carried out to FEEDBACK CONTROL.In addition, as the 1st power supply 14 and the 2nd power supply 16, the power supply of adjusting function with voltage will be used respectively.
The 1st signal amplifying system 2 forms the transmitting system of RF signal.Thereby, in the 1st signal amplifying system 2, possess and generate the transmission waveform of RF signal the transmission waveform generating unit 21 of exporting to the 1st amplifier 13.Send waveform generating unit 21 and be arranged at Machine Room.And the 1st amplifier 13 is configured to using RF signal to WB coil 5 outputs as sending the RF coil of use.
On the other hand, the 2nd signal amplifying system 3 forms the receiving system of MR signal.Thereby the 2nd amplifier 15 that the 2nd signal amplifying system 3 possesses is configured to and amplifies the MR signal of exporting from the RF coil 8 of reception use and export to signal processing system 11.
Wherein, in typical example, will by one or more prime amplifier, be amplified in advance voltage more than several dB degree from receiving the MR signal of RF coil 8 outputs of use, this MR signal is amplified by the 2nd amplifier 15.
Between the photographic studio and Machine Room of MR imaging apparatus 1, wave filter panel 22 is set.Thereby the signal cable 18 that connects the signal cable 18 of the 1st power supply 14 and the 1st amplifier 13 and be connected the 2nd power supply 16 and the 2nd amplifier 15 all runs through wave filter panel 22 and arranges.
On wave filter panel 22, desirable wave filter is installed.The LPF (low pass filter) that for example, the noise consisting of circuit components such as coil or capacitors can be removed to use is installed on wave filter panel 22.Therefore, as shown in Figure 1, the wave filter 23 of removing the noise of the DC voltage of exporting from the 1st power supply 14 can be arranged to wave filter panel 22.
In addition, wave filter panel 22 ground connection.Therefore, can by each ground wire 24 of the 1st amplifier 13 and the 2nd amplifier 15 respectively be arranged at photographic studio and be connected with the wave filter panel 22 between Machine Room, via wave filter panel 22 ground connection.Now, owing to can suppressing the increase of ground connection number, therefore, can reduce the noise that RF signal and MR signal generate.
In the 1st signal amplifying system 2, the signal cable 18 that connects transmission waveform generating unit 21 and the 1st amplifier 13 also will be via wave filter panel 22.Thereby the level of the transmission waveform of the RF signal being transmitted by signal cable 18 is compared minimum with the leaning magnetic field power supply possessing from controller system 10 to the level (level) of the control signal of gradient magnetic field coil 6 outputs.Therefore, due to the control signal to gradient magnetic field coil 6 outputs, may in the transmission waveform of RF signal, produce noise.
Therefore, by magnetic shield, protect the signal cable 18 of connection transmission waveform generating unit 21 and the 1st amplifier 13 very effective.That is, can be provided for suppressing to from sending the magnetic shield of impact transmission waveform, that cause due to the output signal from leaning magnetic field power supply of the RF signal of waveform generating unit 21 outputs.This signal cable 18 for other too.
On the other hand, the 2nd signal amplifying system 3 of the receiving system of formation MR signal also possesses various circuit except the 2nd amplifier 15.Therefore, be not limited to the 2nd amplifier 15, other inscape can also be arranged to photographic studio.
Fig. 3 means the figure of detailed structure example of the receiving system of the MR signal that comprises the 2nd signal amplifying system 3 shown in Fig. 1.
The 2nd signal amplifying system 3 that forms the receiving system of MR signal can as shown in Figure 3, arrange prime amplifier group 25, on-off circuit 26 and reception substrate 27 and form.Prime amplifier group 25 is arranged on the outgoing side of a plurality of coil part 8A that form the RF coil 8 that receives use.
At the outgoing side of prime amplifier group 25, connecting valve circuit 26 as required.In on-off circuit 26, can divide to the MR signal from each coil part 8A after amplifying the MR signal of the receiving cable number that fits in and export regulation in prime amplifier group 25.In on-off circuit 26, also can be provided for as required amplifying the prime amplifier of MR signal.
From the MR signal of on-off circuit 26 outputs, be transfused to reception substrate 27.On the reception substrate 27 of MR signal, the 2nd amplifier 15 and A/D (analog to digital) converter 28 is set.In typical example, a plurality of the 2nd amplifiers 15 are arranged at and receive substrate 27.And by switching respectively the power supply of each amplifier 15, thereby a plurality of the 2nd amplifier 15 plays a role as the variable gain of amplifying MR signal and export to A/D converter 28.The MR signal being digitized in A/D converter 28 is by signal processing system 11 outputs to next stage.
In thering is the 2nd signal amplifying system 3 of such structure, can be configured to the reception substrate 27 of the MR signal that comprises A/D converter 28 is arranged to photographic studio.And, can be arranged at photographic studio by receiving substrate 27, can be connected by the signal cable via wave filter panel 22 with signal processing system 11 receiving substrate 27.
Except above-mentioned example, replacement will receive substrate 27 configured in one piece in photographic studio, be configured at least and the A/D converter of MR signal 28 can be arranged to photographic studio, can also by than the Circnit Layout of the forward level of A/D converter 28 in photographic studio.Or, when the 2nd single amplifier 15 is when amplifying MR signal and being arranged at the 2nd signal amplifying system 3 to the fixed gain of A/D converter 28 outputs, also can be configured to major general's the 2nd amplifier 15 and be arranged at photographic studio.In addition, when a plurality of the 2nd amplifiers 15 are arranged at the 2nd signal amplifying system 3 as variable gain, also can be configured to major general's the 2nd amplifier 15 and be arranged at photographic studio.
In a word, above such MR imaging apparatus 1 is by for amplifying sending the amplifier of the RF signal that the RF coil of use applies and being arranged at the device in photographic studio for amplifying from receiving at least one party of amplifier of MR signal of RF coil 8 outputs of use.
Therefore,, according to MR imaging apparatus 1, can shorten the length of the signal cable 18 between the 1st amplifier 13 and WB coil 5 and the length of the signal cable 18 between the 2nd amplifier 15 and the RF coil 8 of reception use.Its result, can reduce the decay of the signal in the signal cable 18 that connects amplifier and RF coil.
In addition, the 1st power supply 14 and the 2nd power supply 16 are arranged in the Machine Room outside photographic studio.Thereby, the misoperation that can avoid the magnetic saturation due to the transformer of the 1st power supply 14 and the 2nd power supply 16 to cause.That is, can make the 1st amplifier 13 and the 2nd amplifier 15 normally move being arranged under the state in photographic studio.
In addition, when connecting transmission waveform generating unit 21 and the 1st amplifier 13, need to coordinate.Therefore,, if the state that coordination transmission waveform generating unit 21 is connected with the 1st amplifier 13 exchanges as 1 unit, do not need the coordination after exchanging.On the contrary, can also exchange individually and send waveform generating unit 21 and the 1st amplifier 13.
(the 2nd embodiment)
Fig. 4 is the structural drawing of the related MR imaging apparatus of the 2nd embodiment of the present utility model.
In the related MR imaging apparatus 1A of the 2nd embodiment, the 1st power supply 14 and the 2nd power supply 16 are arranged to the point in the photographic studio MR imaging apparatus 1 related from the 1st embodiment shown in Fig. 1 different.For other structure and effect, because the MR imaging apparatus 1 with shown in Fig. 1 is identical in fact, therefore, for same structure, add identical Reference numeral, description thereof is omitted.
As shown in Figure 4, the 1st power supply 14 and the 1st amplifier 13 can be arranged at respectively to the photographic studio of MR imaging apparatus 1A.In this case, also identical with the 1st embodiment, wave filter 23 can be arranged between the 1st power supply 14 and the 1st amplifier 13.Now, wave filter 23 is also arranged in photographic studio.
Similarly, even for the 2nd power supply 16 and the 2nd amplifier 15, also can be arranged at respectively the photographic studio of MR imaging apparatus 1A.In addition, wave filter 23 can be arranged between the 2nd power supply 16 and the 2nd amplifier 15.
According to the 1st signal amplifying system 2A in the 2nd such embodiment, the 2nd signal amplifying system 3A and MR imaging apparatus 1A, can be identical with the 1st embodiment, the length that connects the signal cable 18 of amplifier and RF coil by shortening, reduces the decay of the signal in signal cable 18.In addition, can reduce the equipment that be arranged at outside photographic studio, seek to save space.
(the 3rd embodiment)
Fig. 5 is the structural drawing of the related MR imaging apparatus of the 3rd embodiment of the present utility model.
In the related MR imaging apparatus 1B of the 3rd embodiment, make the 1st amplifier 13 input optical signals different as the point of the input signal MR imaging apparatus 1 related from the 1st embodiment shown in Fig. 1.For other structure and effect, because the MR imaging apparatus 1 with shown in Fig. 1 is identical in fact, therefore, for same structure, add identical Reference numeral, description thereof is omitted.
As shown in Figure 5, can be not using from sending waveform generating unit 21 to the shape information of the RF signals of the 1st amplifier 13 outputs as analog electrical signal, and as light signal.Now, as connecting the signal cable 18 use optical cables 30 that send waveform generating unit 21 and the 1st amplifier 13.In addition, at the input side of the 1st amplifier 13, digital-to-analog (D/A:digital to analog) converter 31 is set.And, to the light signal of the 1st amplifier 13 inputs, in D/A converter 31, convert simulating signal to.Then,, after the RF signal that becomes simulating signal has been exaggerated, be applied to WB coil 5.
In addition, can also, to the 1st amplifier 13, the optical cable that at least 1 of the control signal of the 1st amplifier 13 is transmitted as light signal be set.
Fig. 6 means the figure of the detailed structure of the 1st amplifier 13 shown in Fig. 5.
As shown in Figure 6, on the 1st amplifier 13, possess control circuit 40 and a plurality of amplifying circuit 41.Each amplifying circuit 41 can be according to moving from the control signal of control circuit 40.In addition, can, by from being arranged at the control device 42 output control signals of the 1st amplifier 13 of Machine Room, control each amplifying circuit 41 in the 1st amplifier 13.
As the example of the control signal from 42 outputs of control circuit 40 and control device, can enumerate the switching signal of ON/OFF, for measuring the signals such as the signal of the level of RF signal, the signal that represents the states such as wrong and gate signal.
Therefore, can be using part or all of control signal as light signal.That is, can carry out according to light signal the control of the 1st amplifier 13.Now, will as the optical cable 43 of control signal, be arranged in the 1st amplifier 13 for transmitting light signal.In addition, when using the control signal from control device 42 output during as light signal, control device 42 is connected with the 1st amplifier 13 via optical cable 43.
The control of the 2nd amplifier 15 possessing for the 2nd signal amplifying system 3B in addition, can be used light signal too as control signal.In addition, also can be using the MR signal from the 2nd amplifier 15 to signal processing system 11 outputs as light signal.
The 1st signal amplifying system 2B, the 2nd signal amplifying system 3B and MR imaging apparatus 1B according to having in the 3rd embodiment of such structure, can access the effect identical with the 1st embodiment.In addition can prevent because the signal of omitting in the signal from amplifying enters the 1st amplifier 13 that the input side of the 1st amplifier 13 or the 2nd amplifier 15 occurs or the vibration of the 2nd amplifier 15.
(the 4th embodiment)
Fig. 7 is the structural drawing of the related MR imaging apparatus of the 4th embodiment of the present utility model.
In the related MR imaging apparatus 1C of the 4th embodiment, the RF transmission shape information of input the 1st amplifier 13 is distributed into the point of 2 signals MR imaging apparatus 1 related from the 1st embodiment shown in Fig. 1 different.For other structure and effect, because the MR imaging apparatus 1 with shown in Fig. 1 is identical in fact, therefore, only illustrate the structure sending between waveform generating unit 21 and the 1st amplifier 13, for same structure, add identical Reference numeral, description thereof is omitted.
In the 1st signal amplifying system 2C of MR imaging apparatus 1C, sending between waveform generating unit 21 and the 1st amplifier 13, for example, input signal divider 50 is set on wave filter panel 22.And, as the analog rf signal of exporting from sending waveform generating unit 21 input signals to the 1st amplifier 13, input signal divider 50, be allocated to 2 signals.On the other hand, as the 1st amplifier 13, differential amplifier 51 is set.And the differential signal of a plurality of input signals that are assigned with in differential amplifier 51 is exaggerated.
Therefore,, according to the 1st signal amplifying system 2C and the MR imaging apparatus 1C in the 4th embodiment, can delete the noise that is superimposed on the input signal that is assigned to 2 by the difference processing between input signal.In addition, to the waveform of each input signal of the 1st amplifier 13, become the waveform different from output signal from the 1st amplifier 13.Therefore, can prevent that the hoop omitted is around the input side of the 1st amplifier 13 from the RF signal the amplification of the 1st amplifier 13 output, and make the vibrative state of affairs of the 1st amplifier 13.
(the 5th embodiment)
Fig. 8 is the structural drawing of the related MR imaging apparatus of the 5th embodiment of the present utility model.
In the related MR imaging apparatus 1D that comprises the 1st signal amplifying system 2D of the 5th embodiment, arrange different for monitoring the advancing wave of RF signal of outgoing side of the 1st amplifier 13 and the point of the demodulation system of reflection wave 60 and RF signal being distributed to the point of WB coil 5 the output MR imaging apparatus 1 related from the 1st embodiment shown in Fig. 1.For other structure and effect, identical in fact with the MR imaging apparatus 1 shown in Fig. 1, therefore, only illustrate the structure between the 1st amplifier 13 and WB coil 5, for same structure, add identical Reference numeral, description thereof is omitted.
On WB coil 5, possess a plurality of input channels.Fig. 8 represents to possess the example of the WB coil 5 of 2 input channels.Now, at the outgoing side of the 1st amplifier 13, connect the output signal dividers 61 such as 90 ° of hybrid circuits that distribute and export to WB coil 5 for the RF signal the amplification to from the 1st amplifier 13 outputs.90 ° of hybrid circuits are input signal to be distributed to position differ the signal of 90 ° the circuit of output.
Therefore, can by directivity colligator 62 is disposed at than the 1st amplifier 13 on the lower level measure the advancing wave of the RF signal from the 1st amplifier 13 to WB coil 5 sides and from least one party the reflection wave of the RF signal of WB coil 5 sides.
In addition, can lead between the input channel of WB coil 5 by directivity colligator 62 being disposed between the 1st amplifier 13 and output signal divider 61, making directivity colligator 62 common.
In addition, at the outgoing side of directivity colligator 62, via A/D converter 63 tie geophones 64.By A/D converter 63 and wave detector 64 are arranged to Machine Room, thereby can avoid the bad influence that causes due to magnetic.Wherein, also can protect required circuit component by suitable magnetic shield, thereby a side or both sides in A/D converter 63 and wave detector 64 are arranged in photographic studio.
In addition, on output signal divider 61, preferably connect the dummy load 65 consuming from the reflection wave of WB coil 5 sides.Dummy load 65 is the resistors with good standing-wave ratio (SWR) (SWR:standing wave ratio) characteristic, is RF signal to be carried out to the circuit component of heat conversion.By connecting this dummy load 65, can prevent the reflection wave of RF signal.
(the 6th embodiment)
Fig. 9 is the structural drawing of the related MR imaging apparatus of the 6th embodiment of the present utility model, and Figure 10 means the side view of pallet 12 of an example of the allocation position of the 1st amplifier 13 shown in Fig. 9 and the 2nd amplifier 15.
In the related MR imaging apparatus 1E of the 6th embodiment, the point of the 1st amplifier 13 and the 2nd amplifier 15 MR imaging apparatus 1 related from the 1st embodiment shown in Fig. 1 is set different in the inside of pallet 12.For other structure and effect, identical in fact with the MR imaging apparatus 1 shown in Fig. 1, therefore, only illustrate the configuration example of the 1st amplifier 13 in pallet 12 and the 2nd amplifier 15, for same structure, add identical Reference numeral, description thereof is omitted.
The 1st amplifier 13 and the 2nd amplifier 15 can be distinguished as shown in Figure 9, are disposed at the inside of the pallet 12 that imaging system 4 possesses.On the other hand, can also, by comprising to becoming the RF signal transmitting unit 70 of output destination of the 1st amplifier 13 and the MR signal receiving unit 71 of the prime amplifier of the 2nd amplifier 15 output MR signals or on-off circuit etc., be disposed at the inside of pallet 12.Thus, can further shorten the length of signal cable, reduce the decay of signal.
In addition, can by the 1st amplifier 13 and the 2nd amplifier 15 as shown in Figure 9, in the inside that forms the housing of pallet 12, along hole, configure obliquely.Its result, can make the MR imaging apparatus 1E that comprises the 1st signal amplifying system and the 2nd signal amplifying system compact.In addition, also can be along hole, the 1st amplifier 13 and the 2nd amplifier 15 of pallet 12 in the formation dip plane, end that side is set for the side of pallet 12.
In addition, as shown in figure 10, can, by center configuration the 1st amplifier 13 and the 2nd amplifier 15 with the direction of principal axis Z of magnet 7 at static magnetic field, reduce the impact of static magnetic field.
In addition, the outside in photographic studios such as Machine Rooms, arranges the signal processing system 11 that generates MR view data according to the MR signal from the 2nd amplifier 15 outputs.The A/D conversion of MR signal can be carried out in the either party in photographic studio or outside photographic studio.
(the 7th embodiment)
Figure 11 is the structural drawing of the related MR imaging apparatus of the 7th embodiment of the present utility model, and Figure 12 is the left side view of the pallet 12 shown in Figure 11.
In the related MR imaging apparatus 1F of the 7th embodiment, in the inside of pallet 12, except the 1st amplifier 13 and the 2nd amplifier 15, the point of other circuit is also set different from the MR imaging apparatus 1E in the 6th embodiment shown in Fig. 9.For other structure and effect, due to identical in fact with the MR imaging apparatus 1E in the 6th embodiment shown in Fig. 9, therefore, for same structure, add identical Reference numeral, description thereof is omitted.
In addition, at camera watch region R, be arranged on the RF coil 8 that receives the reception use of the MR signal producing from subject O in the camera watch region R that forms static magnetic field and leaning magnetic field.In addition, be provided with the bed 9 of sending into camera watch region R for loading subject O.
In addition, in forming the housing of pallet 12, collecting bag carries out the reception substrate 27 of the A/D converter 28 of A/D conversion containing the MR signal the RF coil 8 by receiving use not being received carries out frequency inverted.In addition, with low frequency, MR signal is not carried out to frequency inverted (frequency reducing conversion) and the sampling method that carries out A/D conversion is called as Direct Sampling.Thereby, in the housing of pallet 12, take in the reception substrate 27 of the Direct Sampling of carrying out MR signal.Carrying out on the reception substrate 27 of Direct Sampling, example is such as shown in Figure 3, except A/D converter 28, carries the 2nd amplifier 15.
Receive substrate 27 preferably with length direction not with the magnetic flux of static magnetic field towards vertical towards configuration.More wish by receive substrate 27 with length direction along the magnetic flux of static magnetic field towards towards configuring.Thus, can effectively receive the magnetic mask of substrate 27.
In forming the housing of pallet 12, can also take in other circuit.As object lesson, using amplification RF signal and to the 1st amplifier 13 of the radio-frequency coil output of the transmission use such as WB coil 5, at least supply with at least one in the voltage supplying substrates 80 of DC voltages and the control substrate 81 of bed 9 in other circuit are accommodated in the housing of pallet 12 to receiving substrate 27.
In addition, voltage supplying substrate 80 is to convert the DC voltage of supplying with from DC power supply to the DC voltage of regulation the circuit of exporting to reception substrate 27.Certainly, also can supply with DC voltage by the control substrate 81 from voltage supplying substrate 80 to bed 9.In illustrated example, the control substrate 81 of the 1st amplifier 13, voltage supplying substrate 80 and bed 9 is all accommodated in the housing of pallet 12.
Receive substrate 27 and other circuit as illustrated, in the housing of pallet 12, be configured in static magnetic field and can effectively utilize space with the outside of magnet 7.In addition, in the time of in the housing that the 1st amplifier 13 is configured in to pallet 12, the top that reception substrate 27 is disposed to the 1st amplifier 13 can further effectively utilize space.
On the other hand, the outside in photographic studios such as Machine Rooms, arranges the signal processing system 11 that generates MR view data according to the MR signal after the A/D conversion receiving in substrate 27.
According to the MR imaging apparatus 1F in above the 7th such embodiment, except the effect identical with the 6th embodiment, in the past, can dwindle the space that arranges of MR imaging apparatus 1F integral body by the outside circuit that is arranged at pallet 12 being arranged to the inside of pallet 12.Therefore, can be to being difficult to guarantee that the large medical institutions that space is set import MR imaging apparatus 1F.
(other embodiment)
Above, for specific embodiment, narrate, but the embodiment of narrating is nothing but an example, is not intended to limit scope of the present utility model.These embodiments can be implemented with other variety of way, in the scope of main idea that does not depart from utility model, can carry out various omissions, displacement, change.These embodiments or its distortion be contained in the scope of utility model or main idea in the same, be contained in the utility model of claims record and the scope of equalization thereof
For example, can mutually combine each above-mentioned embodiment and form MR imaging apparatus.
Claims (18)
1. a MR imaging apparatus, is characterized in that, possesses:
Static magnetic field magnet, it forms static magnetic field at camera watch region;
Gradient magnetic field coil, it forms leaning magnetic field at above-mentioned camera watch region;
Radio-frequency coil, it receives the magnetic resonance signal producing from subject in having formed the above-mentioned camera watch region of above-mentioned static magnetic field and above-mentioned leaning magnetic field;
Pallet, it has the housing of the tubular of taking in above-mentioned gradient magnetic field coil and above-mentioned static magnetic field use magnet;
Receive substrate, it is accommodated in above-mentioned housing, comprises the A/D converter that the above-mentioned magnetic resonance signal being received by above-mentioned radio-frequency coil is not carried out to frequency inverted but carry out A/D conversion; And
Signal processing system, it generates magnetic resonance image data according to the above-mentioned magnetic resonance signal after above-mentioned A/D conversion.
2. MR imaging apparatus according to claim 1, is characterized in that,
Above-mentioned reception substrate with length direction not vertical with the direction of the magnetic flux of above-mentioned static magnetic field towards configuration.
3. MR imaging apparatus according to claim 2, is characterized in that,
Above-mentioned reception substrate with above-mentioned length direction along the direction of the above-mentioned magnetic flux of above-mentioned static magnetic field towards configuration.
4. MR imaging apparatus according to claim 1, is characterized in that,
In above-mentioned housing, also taken in other circuit.
5. MR imaging apparatus according to claim 4, is characterized in that,
Using amplifying high frequency signal and to for above-mentioned camera watch region is applied high frequency magnetic field transmission use radio-frequency coil output amplifier, at least to above-mentioned reception substrate, supply with the voltage supplying substrate of DC voltage and be accommodated in above-mentioned housing as above-mentioned other circuit for loading at least 1 of control substrate of bed of above-mentioned subject.
6. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that,
Above-mentioned reception substrate is configured in the outside that above-mentioned static magnetic field is used magnet in above-mentioned housing.
7. according to the MR imaging apparatus described in claim 4 or 5, it is characterized in that,
Above-mentioned other circuit is configured in above-mentioned static magnetic field with the outside of magnet in above-mentioned housing.
8. MR imaging apparatus according to claim 5, is characterized in that,
Above-mentioned amplifier is disposed in above-mentioned housing,
Above-mentioned reception substrate is disposed to the top of above-mentioned amplifier.
9. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
To forming the coil part of above-mentioned amplifier and at least one party in transformer, magnetic shield is set.
10. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
The coil part use hollow coil and the magnetic susceptibility that form above-mentioned amplifier are forming with at least one party in core coil below setting.
11. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus also possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region;
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use;
Power supply, it is arranged at the outside of the photography that above-mentioned pallet is set, and to above-mentioned amplifier, supplies with electric power; And
Wave filter, it is arranged at the wave filter panel arranging between above-mentioned photographic studio and the outside in above-mentioned photographic studio, removes from the noise of the DC voltage of above-mentioned power supply output.
12. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
To form not vertical with the direction of the magnetic flux mode of length direction of the substrate of above-mentioned amplifier, configure aforesaid substrate.
13. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
Above-mentioned amplifier is provided with to the optical cable that at least 1 in the control signal of above-mentioned amplifier is transmitted as light signal.
14. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region;
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use; And
Signal distributor, its above-mentioned high-frequency signal that above-mentioned amplifier is exported distributes,
The differential signal that above-mentioned amplifier is configured to a plurality of signals to distributing amplifies.
15. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
Above-mentioned amplifier is configured to input optical signal as input signal.
16. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region;
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use; And
Directivity colligator, it is for measuring the advancing wave of the radio-frequency coil side from above-mentioned amplifier to above-mentioned transmission use and from least one party of the reflection wave of the radio-frequency coil side of above-mentioned transmission use.
17. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, it is arranged at the photographic studio that above-mentioned pallet is set, and high-frequency signal is amplified and export to the radio-frequency coil of above-mentioned transmission use,
Above-mentioned amplifier is disposed to the axial center that above-mentioned static magnetic field is used magnet.
18. according to the MR imaging apparatus described in any one in claim 1 to 5, it is characterized in that, above-mentioned MR imaging apparatus possesses:
The radio-frequency coil that sends use, it is for applying high frequency magnetic field to above-mentioned camera watch region; With
Amplifier, its amplifying high frequency signal is also exported to the radio-frequency coil of above-mentioned transmission use,
Make above-mentioned amplifier tilted configuration in the inside that forms the above-mentioned housing of above-mentioned pallet.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012184633 | 2012-08-23 | ||
| JP2012-184633 | 2012-08-23 | ||
| JP2013-160314 | 2013-08-01 | ||
| JP2013160314A JP6222814B2 (en) | 2012-08-23 | 2013-08-01 | Magnetic resonance imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203480011U true CN203480011U (en) | 2014-03-12 |
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ID=50228319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320520041.4U Expired - Lifetime CN203480011U (en) | 2012-08-23 | 2013-08-23 | Magnetic resonance imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203480011U (en) |
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2013
- 2013-08-23 CN CN201320520041.4U patent/CN203480011U/en not_active Expired - Lifetime
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Effective date of registration: 20160819 Address after: Japan Tochigi Patentee after: TOSHIBA MEDICAL SYSTEMS Corp. Address before: Tokyo, Japan Patentee before: Toshiba Corp. Patentee before: TOSHIBA MEDICAL SYSTEMS Corp. |
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