CN101261315A - Magnetic resonance imaging apparatus - Google Patents
Magnetic resonance imaging apparatus Download PDFInfo
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- CN101261315A CN101261315A CNA2008100821883A CN200810082188A CN101261315A CN 101261315 A CN101261315 A CN 101261315A CN A2008100821883 A CNA2008100821883 A CN A2008100821883A CN 200810082188 A CN200810082188 A CN 200810082188A CN 101261315 A CN101261315 A CN 101261315A
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Abstract
The present invention provides a magnetic resonance imaging device which can shorten the stub as possible, inhibits the deterioration of the high-frequency signal or the unnecessary radiation and can freely execute selection to the multiple-channel signal. The invention is characterized in that the RF coil units (6c and 6d) comprises a plurality of coil components which respectively detect the magnetic resonance signal emitted from the checked object according to the applied inclining magnetic field and the high-frequency impulse. The signals of a plurality of channels based on the magnetic resonance signal are outputted. A receiving part (9) comprises a plurality of receiving circuits with number less than the number of a plurality of channels. The receiving circuits respectively receive and process a random signal in the signals of a plurality of channels. A selecting part (8b) leads to a connection of a plurality of matrix switches with multiple segments, selects several magnetic resonance signals from the signals of a plurality of channels and respectively input the selected magnetic resonance signals to the plurality of receiving circuits. A main control part (17) sets the camera shooting condition and confirms the connection mode of a plurality of matrix switches according to the camera shooting condition.
Description
Cross reference to related application
The application is based on the Japan of submitting on March 8th, 2007 patented claim 2007-058901 formerly, and requires to enjoy its right of priority, and a application in back is all incorporated the application into way of reference.
Technical field
The present invention relates to a kind of magnetic resonance imaging apparatus, use a plurality of coil components to carry out RF (radiofrequency, the radio frequency) transmission of pulse or the reception of magnetic resonance signal.
Background technology
MR imaging apparatus in recent years can be used various types of radio-frequency coils of corresponding purposes.The configuration that has in this radio-frequency coil a plurality of coil components.Polytype radio-frequency coil is installed when also having in addition.
Therefore, a plurality of coil components and polytype radio-frequency coil that MR imaging apparatus can be connected in parallel and dispose in the radio-frequency coil, its quantity increases.
On the other hand, the coil component that is connected in parallel so is not all to use simultaneously.Therefore, the receiving circuit by the coil component receiving magnetic resonance signals, and send the transtation mission circuit of RF pulse by coil component, but the number of connection of the coil component that its quantity is less than.
In this case, the coil component that need should use optionally is connected to receiving circuit and transtation mission circuit.But the combination of this connected mode is very many, makes to select very complexity of circuit.As selecting circuit, can use representational conveying type switch and matrix switch.
Figure 14 is the figure of the topology example of expression conveying type switch.In this example, utilize the selector switch 141,142,143,144 of 4 two input one outputs, constitute the signal selecting circuit of four inputs, two outputs.
Figure 15 is the figure that the structure of 16 matrix switches of exporting is imported in expression 16.
The selection degree of freedom of conveying type switch is less, and is difficult to accomplish hyperchannelization.
Matrix switch is compared the conveying type switch, selects degree of freedom bigger, and also than being easier to accomplish hyperchannelization.But in the multi-channel type matrix switch, according to the selection mode of signal, the not connection line that is called as stub (Stub) shown in Figure 15 is elongated.In the high-frequency signal as the magnetic resonance signal, stub is long more, might cause signal poor more.If stub is elongated when selecting RF to send signal, then might increase unnecessary radiation.
In addition, as the technology that is associated, for example known the disclosed technology of TOHKEMY 2001-46356.
In view of the foregoing, expectation can be shortened stub as possible, suppresses the deterioration of high-frequency signal or unnecessary radiation, and can freely carry out multichannel signal and select.
Summary of the invention
The magnetic resonance imaging apparatus of first mode of the present invention comprises: applying unit applies leaning magnetic field and high-frequency impulse to the subject that is placed in the magnetic field; High frequency coil unit, have according to described leaning magnetic field that applies and described high-frequency impulse and detect respectively from a plurality of coil components of the magnetic resonance signal of described subject radiation, output is based on passing through described a plurality of coil components signal of a plurality of passages of detected a plurality of magnetic resonance signals respectively; A plurality of receiving circuits, its quantity are less than described a plurality of passage, receive and handle the arbitrary signal in the signal of described a plurality of passages respectively; Select circuit, a plurality of matrix switch multistages ground is connected, the several magnetic resonance signals of selection from the signal of described a plurality of passages are input to described a plurality of receiving circuit respectively with the magnetic resonance signal of this selection; Set the setup unit of imaging conditions; And determining unit, according to the described imaging conditions of setting, determine the connected mode of described a plurality of matrix switches.
The magnetic resonance imaging apparatus of second mode of the present invention comprises: the transmission coil with a plurality of coil components; Transtation mission circuit, its quantity are less than described a plurality of coil component, send the high-frequency impulse that is used for imposing on the subject that is placed on static magnetic field by described coil component; Select circuit, a plurality of matrix switch multistages ground connected, from described a plurality of coil components selection several, the coil component of this selection is connected to described a plurality of transmitter; Determining unit is determined the connected mode of described a plurality of matrix switches according to the size of described subject; And receiving coil, according to high-frequency impulse, under the state that has been applied in leaning magnetic field, detect electromagnetic field by the high frequency magnetic field radiation that produces from coil component according to described connected mode input.
Other purpose of the present invention and advantage will be listed in the detailed description part below, and they also will be conspicuous according to declaratives, perhaps can learn by implementing the present invention.Means that objects and advantages of the present invention can provide by means of following mask body and array mode realize and obtain.
Accompanying drawing is the part of instructions, and they show currently preferred embodiment of the present invention, and, describe in detail with summary description that provides above and preferred embodiment given below, illustrate principle of the present invention.
Description of drawings
Fig. 1 is the figure of the structure of the magnetic resonance imaging apparatus 100 that relates to of expression embodiments of the present invention.
Fig. 2 is the figure of the structure of the expression signal selecting circuit 81 that can relate to as the 1st embodiment of selection portion 8a among Fig. 1 or selection portion 8b.
Fig. 3 is the illustration of connection status of the selection portion 8a of RF coil unit 6b in the presentation graphs 1 and sending part 7.
Fig. 4 is the illustration of connection status of the selection portion 8b of RF coil unit 6d in the presentation graphs 1 and acceptance division 9.
Fig. 5 is an illustration of the arrangement of coil segment 62-1～62-4 among the RF coil unit 6d in the presentation graphs 1 and coil component 62a, 62b, 62c, 62d.
Fig. 6 is the process flow diagram of treatment step of master control part 17 of the control of selection portion 8a, the 8b of expression among relevant Fig. 1.
Fig. 7 is the illustration of expression by the connected mode of selection portion 8a.
Fig. 8 is an illustration of expression section relative importance value.
Fig. 9 is the illustration of expression by the connected mode of selection portion 8b.
Figure 10 is the figure of the structure of the expression signal selecting circuit 82 that can relate to as the 2nd embodiment of selection portion 8a among Fig. 1 or selection portion 8b.
Figure 11 is the figure of the structure of the expression signal selecting circuit 83 that can relate to as the 3rd embodiment of selection portion 8a among Fig. 1 or selection portion 8b.
Figure 12 is the figure of the structure of the expression signal selecting circuit 84 that can relate to as the 4th embodiment of selection portion 8a among Fig. 1 or selection portion 8b.
Figure 13 is the figure of expression distressed structure example of the present invention.
Figure 14 is the figure of the topology example of expression conveying type switch.
Figure 15 is the structural drawing of the matrix switch of expression 16 inputs 16 outputs.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
Fig. 1 is the figure of the structure of the magnetic resonance imaging apparatus 100 that relates to of expression embodiments of the present invention.This magnetic resonance imaging apparatus shown in Figure 1 100 has static field magnet 1, gradient magnetic field coil unit 2, leaning magnetic field power supply 3, sleeping berth 4, sleeping berth control part 5, RF coil unit 6a, 6b, 6c, 6d, sending part 7, selection portion 8b, acceptance division 9 and computer system 10.
Gradient magnetic field coil unit 2 is hollow drum, is configured in the inboard of static field magnet 1.Gradient magnetic field coil unit 2 combination has each three kinds of coils of corresponding mutually orthogonal X, Y, Z.Gradient magnetic field coil unit 2 makes above-mentioned three kinds of coils independently accept current supply from leaning magnetic field power supply 3, and produces the leaning magnetic field of magnetic field intensity along X, Y, each inclination of Z.In addition, Z-direction for example is the direction identical with static magnetic field.Each leaning magnetic field of X, Y, Z for example corresponds respectively to that section (Slice) is selected with leaning magnetic field Gs, phase encoder is with leaning magnetic field Ge and read (Read out) and use leaning magnetic field Gr.Section is selected to be used at random determining the photography section with leaning magnetic field Gs.Phase encoder is used for changing according to the locus phase place of magnetic resonance signal with leaning magnetic field Ge.Read the frequency that is used for changing magnetic resonance signal with leaning magnetic field Gr according to the locus.
Be inserted under the state of subject 200 on being placed on the top board 4a of sleeping berth 4 in the cavity (photographing space) of gradient magnetic field coil unit 2.Sleeping berth 4 is driven by sleeping berth control part 5, and top board 4a is moved at its length direction (left and right directions among Fig. 1) and above-below direction.Usually, sleeping berth 4 is provided as the central axes that makes this length direction and static field magnet 1.
The RF pulse of the corresponding La Moer frequency of sending part 7 outputs.The sending part 7 different respectively a plurality of RF pulses of output phase side by side.
Connecting leaning magnetic field power supply 3, sleeping berth control part 5, sending part 7, acceptance division 9 and selection portion 8b etc. in interface portion 11.Interface portion 11 is carried out the input and output of the signal of transmitting-receiving between each unit of these connections and computer system 10.
Reconstruct 13 pairs in portion and be stored in magnetic resonance signal data in the storage part 14 to carry out aftertreatment be reconstructing of fourier transform etc., obtain the spectral data or the view data of the desired nuclear spin in the subject 200.
(the 1st embodiment)
Fig. 2 is the figure of the structure of the expression signal selecting circuit 81 that can relate to as the 1st embodiment of selection portion 8a or selection portion 8b.The maximum input signal quantity and the spiking output quantity of this signal selecting circuit 81 are " 16 ".
Matrix switch 21-1～21-4 and matrix switch 22-1～22-4 all are matrix switches of the known configurations of four inputs, four outputs (4 * 4).
16 input ends of the total that matrix switch 21-1～21-4 has are transfused to from the signal of each coil component output of being located at RF coil unit 6c, 6d.In addition, call input signal IN1～IN4 at this signal that is input to matrix switch 21-1, the signal that is input to matrix switch 21-2 is called input signal IN5～IN8, the signal that is input to matrix switch 21-3 is called input signal IN9～IN12, the signal that is input to matrix switch 21-4 is called input signal IN13～IN16.
Matrix switch 21-1～21-4 4 output terminals separately are connected at the input end of each matrix switch 22-1～22-4 respectively.The signal of the 1st output terminal output that has from each matrix switch 22-1～22-4, as output signal OUT1～OUT4 from signal selecting circuit 81 outputs.The signal of the 2nd output terminal output that has from each matrix switch 22-1～22-4, as output signal OUT5～OUT8 from signal selecting circuit 81 outputs.The signal of the 3rd output terminal output that has from each matrix switch 22-1～22-4, as output signal OUT9～OUT12 from signal selecting circuit 81 outputs.The signal of the 4th output terminal output that has from each matrix switch 22-1～22-4, as output signal OUT13～OUT16 from signal selecting circuit 81 outputs.
The instruction that drive division 23 is accepted from master control part 17 by interface portion 11.Drive division 23 drives matrix switch 21-1～21-4 and matrix switch 22-1～22-4, carries out the appropriate signal that instruct is selected.
When the signal selecting circuit 81 that will constitute like this is applicable to selection portion 8b, can connect maximum 16 coil components respectively at 16 input ends of total that matrix switch 21-1～21-4 has.In addition, be 15 when following at coil component, can select arbitrarily which input end these coil components are connected.
On the other hand, the disposal system that is connecting a plurality of passages that acceptance division 9 has at the output terminal of matrix switch 22-1～22-4 respectively.Usually, the number of channels of the disposal system that has of acceptance division 9 is less than the quantity of the coil component that can connect selection portion 8b.That is, when using signal selecting circuit 81, the number of channels of the disposal system that acceptance division 9 has is generally below 15 passages.During this situation, respectively to each matrix switch 22-1～approaching as far as possible disposal system of 22-4 number of connection.For example, if acceptance division 9 has the disposal system of 8 passages, then connect the disposal system of 2 passages respectively at each matrix switch 22-1～22-4.In addition, in the present embodiment, be input to the connected mode of acceptance division 9, can realize the connection of above-mentioned form according to the output signal that sequence number is continuous.Specifically, the connected mode according to the 8 passage disposal system input/output signal OUT1～OUT8 that have to acceptance division 9 respectively can realize the connection of above-mentioned form.According to 8 passage disposal system input/output signal OUT5～OUT12 that have to acceptance division 9 respectively and the connected mode of output signal OUT7～OUT14, also can realize the connection of above-mentioned form.
In addition, drive division 23 drives matrix switch 21-1～21-4, makes in the selected input signal the approaching as far as possible input signal of quantity import each matrix switch 22-1～22-4.And drive division 23 drives matrix switch 22-1～22-4, makes from the signal of matrix switch 21-1～21-4 input to be exported by the output terminal of the disposal system connection of acceptance division 9.Specifically, if selected 8 input signals, then drive matrix switch 21-1～21-4 and make to matrix switch 22-1～22-4 and respectively import two signals.Matrix switch 22-1～22-4 makes two signals being imported export to the disposal system of these connections according to the top described disposal system that connects 2 passages respectively so drive matrix switch 22-1～22-4.This can realize in the following manner, for example, makes the output signal of selected input signal and the disposal system that is input to acceptance division 9 corresponding according to the less order of their sequence number.
Specifically, selecting input signal IN1～IN8, output signal OUT1～OUT8 is imported under the situation of disposal system of acceptance division 9, and input signal IN1～IN8 corresponds respectively to output signal OUT1～OUT8.And drive division 23 gating matrix switch 21-1,21-2,22-1～22-4 form the connected mode of the following stated.
(1) input signal IN1 is exported by matrix switch 21-1 and matrix switch 22-1 as output signal OUT1.
(2) input signal IN2 is exported by matrix switch 21-1 and matrix switch 22-2 as output signal OUT2.
(3) input signal IN3 is exported by matrix switch 21-1 and matrix switch 22-3 as output signal OUT3.
(4) input signal IN4 is exported by matrix switch 21-1 and matrix switch 22-4 as output signal OUT4.
(5) input signal IN5 is exported by matrix switch 21-2 and matrix switch 22-1 as output signal OUT5.
(6) input signal IN6 is exported by matrix switch 21-2 and matrix switch 22-2 as output signal OUT6.
(7) input signal IN7 is exported by matrix switch 21-2 and matrix switch 22-3 as output signal OUT7.
(8) input signal IN8 is exported by matrix switch 21-2 and matrix switch 22-4 as output signal OUT8.
Like this, above-mentioned 8 paths all are independently, can realize desired selection mode.
That is, for example output signal OUT1 and output signal OUT5 are from same matrix switch 22-1 output, and this matrix switch 22-1 only is connected to matrix switch 21-1 by 1 signal wire.Therefore, can not be with two among input signal IN1～IN4 of matrix switch 21-1 as output signal OUT1 and output signal OUT5 output.But, when output signal OUT5 is effective, selecting the input signal more than 5, output signal OUT5 is corresponding among input signal IN5～IN16 any.Therefore, can realize the desired selection mode of above narration, and among input signal IN1～IN4 of matrix switch 21-1 two can be corresponding to output signal OUT1 and output signal OUT5.
No matter under the situation of selecting which input signal, and the whichever output signal is input under the situation of disposal system of acceptance division 9, can realize desired selection mode equally.
On the other hand, when the signal selecting circuit 81 that will constitute as mentioned above is applicable to selection portion 8a, can import maximum 16 RF signals respectively to 16 input ends of total that matrix switch 21-1～21-4 has.In addition, be 15 when following at the RF signal of sending part 7 output, can select arbitrarily which input end these RF signals are input to.
Connecting a plurality of coil components that RF coil unit 6a and RF coil unit 6b have respectively at the output terminal of matrix switch 22-1～22-4.Usually, the RF number of signals of sending part 7 outputs is less than the quantity of the coil component that can connect selection portion 8a.That is, when using signal selecting circuit 81, the RF number of signals is generally below 15.During this situation, respectively to each matrix switch 21-1～approaching as far as possible RF signal of 21-4 input quantity.For example, if the RF signal is 8, then import two RF signals respectively to each matrix switch 21-1～21-4.
In addition, drive division 23 drives matrix switch 21-1～21-4, make the approaching as far as possible RF signal of quantity be input to each matrix switch 22-1～22-4, and drive matrix switch 22-1～22-4, make and to export to and to be set as effective coil component from the matrix switch 21-1～signal of 21-4 input.In addition, about which coil component is made as effectively, the determining of the size at the position of can considering to photograph, section towards, the sensitive area of coil component or the zone of excitation RF etc.
Fig. 3 is the illustration of connection status of the selection portion 8a of expression RF coil unit 6b and sending part 7.Wherein, selection portion 8a uses signal selecting circuit 81.
In the example of Fig. 3, RF coil unit 6b comprises 10 coil component 61-1～61-10.These coil components 61-1～61-10 is connected to selection portion 8a, and output signal OUT1～OUT10 is imported respectively.
Sending part 7 comprises transmit amplifier 71, separation vessel 72 and 6 phase-shifter 73-1～73-6.Transmit amplifier 71 amplifies the RF pulse.Separation vessel 72 will be 6 along separate routes from the RF pulse of transmit amplifier 71 outputs, offer phase-shifter 73-1～73-6 respectively.Phase-shifter 73-1～73-6 makes the phase place independent variation of RF pulse.Phase-shifter 73-1～73-6 is connected to selection portion 8a, and with this output signal as input signal IN1～IN6.
Fig. 4 is the illustration of connection status of the selection portion 8b of expression RF coil unit 6d and acceptance division 9.Wherein, selection portion 8b uses signal selecting circuit 81.
In the example of Fig. 4, acceptance division 9 comprises 8 receiving circuit 91-1～91-8.These receiving circuits 91-1～91-8 is connected to selection portion 8b, and output signal OUT1～OUT8 is imported respectively.
Coil segment 62-1～62-4 comprises 4 coil component 62a, 62b, 62c, 62d respectively.Coil component 62a, 62b, 62c, 62d are aligned to row, and an adjacent windings parts part is each other overlapped each other.Coil segment 62-1～62-4 arranges in the direction that the orientation with coil component 62a, 62b, 62c, 62d intersects as shown in Figure 5.Neighbor's part each other overlaps each other among coil segment 62-1～62-4.
This RF coil unit 6d generally uses under following state, promptly, make the orientation of coil component 62a, 62b, 62c, 62d roughly consistent with X-direction, make the orientation of coil segment 62-1～62-4 and top board 41 length direction, be that the axon direction (Z-direction) of subject P is roughly consistent.
Compositor 63-1～63-4 comprises 180 degree distribution/ combiner circuit 63a, 63b and 90 degree distribution/combiner circuit 63c respectively.
The signal that coil component 62a, 62d export respectively is imported into 180 degree distribution/combiner circuit 63a.180 degree distribution/combiner circuit 63a carry out homophase and anti-phase synthetic respectively to these signals.180 degree distribution/combiner circuit 63a will export to 90 degree distribution/combiner circuit 63c as the signal that obtains with the result who is combined to.180 degree distribution/combiner circuit 63a will export as anti-phase composite signal as the signal that anti-phase synthetic result obtains.
The signal that coil component 62b, 62c export respectively is imported into 180 degree distribution/combiner circuit 63b.180 degree distribution/combiner circuit 63b carry out homophase and anti-phase synthetic respectively to these signals.180 degree distribution/combiner circuit 63a will export as the homophase composite signal as the signal that obtains with the result who is combined to.180 degree distribution/combiner circuit 63a will export to 90 degree distribution/combiner circuit 63c as the signal that anti-phase synthetic result obtains.
90 degree distribution/combiner circuit 63c will be spent by the signal phase shift 90 that 180 degree distribution/combiner circuit 63a provide, and be synthesized to then in the signal that is provided by 180 degree distribution/combiner circuit 63b.90 degree distribution/combiner circuit 63c will export as the QD signal as the signal that this synthetic result obtains.And 90 degree distribution/combiner circuit 63c will export as Anti QD signal with the signal of QD signal inversion.
Fig. 6 is the process flow diagram of treatment step of master control part 17 of the control of expression relevant selection portion 8a, 8b.
At step Sa1, master control part 17 is set photography conditions according to the operator's who imports by input part 16 indication.
At step Sa2, master control part 17 is according to the photography conditions of above-mentioned setting, sets among coil component 61-1～61-10 which sent coil as using.This setting can be considered size of FOV (field of view, field range), slice position or subject in the photography conditions of above-mentioned setting etc., carries out automatically according to known manner.In addition, the size of subject 200 can be calculated according to the view data that the whole subject 200 of shooting obtains.Use the quantity that sends coil to be set as below the quantity of phase-shifter 73-1～73-6.In addition,, preferably select the coil component of minimum necessary limit to send coil, use the transmission coil to be generally less quantity as using in order to reduce the magnetic resonance signal that is used to reconstruct image as noise.
At step Sa3, the connected mode that master control part 17 is determined by selection portion 8a, and will send the RF signal that the identical phase-shifter of coil is exported respectively from the use quantity and the phase-shifter 73-1～73-6, be input to each coil component that sends coil and select as using.And the connected mode that master control part 17 will be determined is indicated to selection portion 8a.
Fig. 7 is that expression coil component 61-2,61-3,61-4 are set to and use when sending coil, an illustration of the connected mode by selection portion 8a.This connected mode is as described below.
(1) the RF pulse from phase-shifter 73-1 output offers coil component 61-1 by matrix switch 21-1 and matrix switch 22-2.
(2) the RF pulse from phase-shifter 73-2 output offers coil component 61-2 by matrix switch 21-1 and matrix switch 22-3.
(3) the RF pulse from phase-shifter 73-3 output offers coil component 61-1 by matrix switch 21-1 and matrix switch 22-3.
At step Sa4, master control part 17 set with among coil segment 62-1～62-4 which as using section.This setting can be carried out according to the operator's who imports by input part 16 indication, also can carry out automatically according to the photography conditions of setting at step Sa1.
At step Sa5, whether master control part 17 is confirmed at the quantity of the signal that uses section to obtain more than the quantity of receiving circuit 91-1～91-8.At this, if number of signals below receiving circuit quantity, then master control part 17 changes step Sa6 over to from step Sa5.At step Sa6, master control part 17 selects relevant all signals of section that use as using signal.But, if number of signals more than receiving circuit quantity, then master control part 17 changes step Sa7 over to from step Sa5.At step Sa7, master control part 17 is from about selecting the quantity signal identical with receiving circuit quantity as the use signal all signals that use section.The selection of this use signal is for example carried out according to predetermined relative importance value.For example, the priority of each signal during parallel imaging (Parallel Imaging) is the order of QD signal, homophase composite signal, anti-phase composite signal, AntiQD signal.And, in the time can not selecting whole signal of same type, for example with reference to the section relative importance value of setting as shown in Figure 8.
Specifically, suppose that coil segment 62-1,62-2,62-3 are set to when using section, about the QD signal of these coil segments and homophase composite signal add up to 6, so these signals can all be chosen as the use signal.But, because receiving circuit quantity is 8, so can not all be chosen as the use signal to 3 anti-phase composite signals.Therefore, according to the section relative importance value shown in Fig. 8, select respectively the anti-phase composite signal relevant as the use signal with the coil segment 62-1 of the coil segment 62-2 of relative importance value " 1 " and relative importance value " 2 ".
Step Sa6 and step Sa7 select to finish use signal after, master control part 17 changes step Sa8 over to.At step Sa8, the connected mode that master control part 17 is determined by selection portion 8b will be input to the quantity receiving circuit identical with it as each signal that uses signal to select.And the connected mode that master control part 17 will be determined is indicated to selection portion 8b.
Fig. 9 is an illustration of the connected mode of passing through selection portion 8b of the above-mentioned concrete example of expression.This connected mode is as described below.
(1) imports receiving circuit 91-1 from the QD signal of compositor 63-2 output by matrix switch 21-2 and matrix switch 22-1.
(2) import receiving circuit 91-2 from the QD signal of compositor 63-1 output by matrix switch 21-1 and matrix switch 22-2.
(3) import receiving circuit 91-3 from the QD signal of compositor 63-3 output by matrix switch 21-3 and matrix switch 22-3.
(4) import receiving circuit 91-4 from the homophase composite signal of compositor 63-2 output by matrix switch 21-2 and matrix switch 22-4.
(5) import receiving circuit 91-5 from the homophase composite signal of compositor 63-1 output by matrix switch 21-1 and matrix switch 22-2.
(6) import receiving circuit 91-6 from the homophase composite signal of compositor 63-3 output by matrix switch 21-3 and matrix switch 22-2.
(7) import receiving circuit 91-7 from the anti-phase composite signal of compositor 63-2 output by matrix switch 21-2 and matrix switch 22-3.
(8) import receiving circuit 91-8 from the anti-phase composite signal of compositor 63-1 output by matrix switch 21-1 and matrix switch 22-4.
(the 2nd embodiment)
Figure 10 is the figure of the structure of the expression signal selecting circuit 82 that can relate to as the 2nd embodiment of selection portion 8a or selection portion 8b.The maximum input signal quantity and the spiking output quantity of this signal selecting circuit 82 are " 32 ".
Signal selecting circuit 82 comprises matrix switch 24-1～24-4, matrix switch 32-1～25-4 and drive division 26.
Matrix switch 24-1～24-4 and matrix switch 25-1～25-4 all are matrix switches of 8 * 8 known configurations.
32 input ends of the total that matrix switch 24-1～24-4 has are transfused to from the signal of each coil component output of being located at RF coil unit 6c, 6d.In addition, be called input signal IN1～IN8 at this signal that will be input to matrix switch 24-1, the signal that is input to matrix switch 24-2 is called input signal IN9～IN16, the signal that is input to matrix switch 24-3 is called input signal IN17～IN24, the signal that is input to matrix switch 24-4 is called input signal IN25～IN25.
Matrix switch 24-1～24-4 8 output terminals separately respectively have two respectively and are connected to the input end of being located at each matrix switch 25-1～25-4.From the signal that the 1st and the 2nd output terminal of being located at each matrix switch 25-1～25-4 is exported, export from signal selecting circuit 82 as output signal OUT1～OUT8.From the signal that the 3rd and the 4th output terminal of being located at each matrix switch 25-1～25-4 is exported, export from signal selecting circuit 82 as output signal OUT9～OUT16.From the signal that the 5th and the 6th output terminal of being located at each matrix switch 25-1～25-4 is exported, export from signal selecting circuit 82 as output signal OUT17～OUT24.From the signal that the 7th and the 8th output terminal of being located at each matrix switch 25-1～25-4 is exported, export from signal selecting circuit 82 as output signal OUT25～OUT32.
The instruction that drive division 26 is accepted from master control part 17 by interface portion 11.Drive division 26 drives matrix switch 24-1～24-4 and matrix switch 25-1～25-4, carries out the appropriate signal that instruct is selected.
In the signal selecting circuit 82 that constitutes like this, under the condition identical with described the 1st embodiment, according to the identical rule of described the 1st embodiment, drive division 26 drives matrix switch 24-1～24-4 and matrix switch 25-1～25-4, can select 32 arbitrary signals among input signal IN1～IN32 thus, and export as the output signal of the disposal system that is input to acceptance division 9.And this signal selecting circuit 82 is structures of 32 * 32, and matrix switch 24-1～24-4,25-1～25-4 all can be 8 * 8 structures.Thus, compare with 32 * 32 matrix switch, stub can shorten, and can transmit the high frequency magnetic resonance signal well, and can suppress unnecessary radiation when transmitting the RF signal.
(the 3rd embodiment)
Figure 11 is the figure of the structure of the expression signal selecting circuit 83 that can relate to as the 3rd embodiment of selection portion 8a or selection portion 8b.The maximum input signal quantity and the spiking output quantity of this signal selecting circuit 83 are " 64 ".
Signal selecting circuit 83 comprises matrix switch 27-1～27-8, matrix switch 28-1～28-8 and drive division 29.
Matrix switch 27-1～27-8 and matrix switch 28-1～28-8 all are matrix switches of 8 * 8 known configurations.
64 input ends of the total that matrix switch 27-1～27-8 has are transfused to respectively from the signal IN1～IN64 of each coil component output of being located at RF coil unit 6c, 6d.
Matrix switch 27-1～27-8 8 output terminals separately are connected respectively to the input end of being located at each matrix switch 28-1～28-8.From the signal that the 1st output terminal of being located at each matrix switch 28-1～28-8 is exported, export from signal selecting circuit 83 as output signal OUT1～OUT8.From the signal that the 2nd output terminal of being located at each matrix switch 28-1～28-8 is exported, export from signal selecting circuit 83 as output signal OUT9～OUT16.Equally, signal from the 3rd～the 8th output terminal output of being located at each matrix switch 28-1～28-8, respectively as output signal OUT17～OUT24, output signal OUT25～OUT32, output signal OUT33～OUT40, output signal OUT41～OUT48, output signal OUT49～OUT56, output signal OUT57～OUT64, from signal selecting circuit 83 outputs.
The instruction that drive division 29 is accepted from master control part 17 by interface portion 11.Drive division 29 drives matrix switch 27-1～27-8 and matrix switch 28-1～28-8, carries out the appropriate signal that instruct is selected.
In the signal selecting circuit 83 that constitutes like this, under the condition identical with described the 1st embodiment, according to the identical rule of described the 1st embodiment, drive division 29 drives matrix switch 27-1～27-8 and matrix switch 28-1～28-8, can select 64 arbitrary signals among input signal IN1～IN64 thus, and export as the output signal of the disposal system that is input to acceptance division 9.And this signal selecting circuit 83 is structures of 64 * 64, and matrix switch 27-1～27-8,28-1～28-8 all can be 8 * 8 structures.Thus, compare with 64 * 64 matrix switch, stub can shorten, and can transmit the high frequency magnetic resonance signal well, and can suppress unnecessary radiation when transmitting the RF signal.
(the 4th embodiment)
Figure 12 is the figure of the structure of the expression signal selecting circuit 84 that can relate to as the 4th embodiment of selection portion 8a or selection portion 8b.The maximum input signal quantity and the spiking output quantity of this signal selecting circuit 84 are " 128 ".
Signal selecting circuit 84 comprises selects circuit 30-1～30-4, selection circuit 31-1～31-4 and drive division 32.
The signal selecting circuit 82 of selecting circuit 30-1～30-4 and selecting circuit 31-1～31-4 all can use the 2nd embodiment to relate to.
128 input ends of total of selecting circuit 30-1～30-4 to have are transfused to respectively from the signal IN1～IN128 of each coil component output of being located at RF coil unit 6c, 6d.
Select circuit 30-1～30-4 32 output terminals separately respectively to have 8 to be connected to the input end of being located at each selection circuit 31-1～31-4 respectively.From being located at the signal of each the 1st～the 8th output terminal of selecting circuit 31-1～31-4 output, export from signal selecting circuit 84 as output signal OUT1～OUT32.From being located at the signal of each the 9th～the 16th output terminal of selecting circuit 31-1～31-4 output, export from signal selecting circuit 84 as output signal OUT33～OUT64.From being located at the signal of each the 17th～the 24th output terminal of selecting circuit 31-1～31-4 output, export from signal selecting circuit 84 as output signal OUT65～OUT96 respectively.From being located at the signal of each the 24th～the 32nd output terminal of selecting circuit 31-1～31-4 output, respectively as output signal OUT97～OUT128, from signal selecting circuit 84 outputs.
The instruction that drive division 32 is accepted from master control part 17 by interface portion 11.Drive division 32 drives to be selected circuit 30-1～30-4 and selects circuit 31-1～31-4, carries out the appropriate signal that instruct is selected.
In the signal selecting circuit 84 that constitutes like this, under the condition identical with described the 1st embodiment, according to the identical rule of described the 1st embodiment, drive division 32 drives to be selected circuit 30-1～30-4 and selects circuit 31-1～31-4, can select 128 arbitrary signals among input signal IN1～IN128 thus, and export as the output signal of the disposal system that is input to acceptance division 9.And this signal selecting circuit 84 is structures of 128 * 128, and the matrix switch of selecting circuit 30-1～30-4 and selecting circuit 31-1～31-4 to have all can be 8 * 8 structure.Thus, compare with 128 * 128 matrix switch, stub can shorten, and can transmit the high frequency magnetic resonance signal well, and can suppress unnecessary radiation when transmitting the RF signal.
This embodiment can be implemented following various distortion.
The input quantity of the input quantity of the quantity separately of the matrix switch of leading portion side and rear section side, leading portion side matrix switch and output quantity and rear section side matrix switch and output quantity can be set arbitrarily in the scope of the condition that satisfies the present application respectively.In addition, can be used as in the signal selecting circuit of selection portion 8a, needed spiking output quantity is set above-mentioned each numerical value as benchmark to get final product, can needed maximum input signal quantity set above-mentioned each numerical value as benchmark getting final product as in the signal selecting circuit of selection portion 8b.
As shown in Figure 6, leading portion side matrix switch also can mix matrix switch 33-1,33-3 and the matrix switch 32-1 that has different sizes.Equally, the rear section side matrix switch also can mix the matrix switch that has different sizes.And as shown in Figure 6, the size of leading portion side matrix switch 33-1～33-3 and rear section side matrix switch 34-1,34-2 also can be different.
The rear section side matrix switch also can make output quantity be less than input quantity.For example, in the 1st embodiment, can be replaced into matrix switch 22-1～22-4 respectively 4 * 2 matrix switch.This structure is can be as also useful in the signal selecting circuit of selection portion 8b.
Leading portion side matrix switch also can make input quantity be less than output quantity.For example, in the 1st embodiment, can be replaced into matrix switch 21-1～21-4 respectively 2 * 4 matrix switch.This structure is can be as also useful in the signal selecting circuit of selection portion 8a.
Can also be replaced into the r of a rear section side matrix switch and have the matrix switch that r doubly imports.For example, in the 1st embodiment, matrix switch 21-1,21-22 can be replaced into a matrix switch of 8 * 8.
To those skilled in the art, other advantages and flexible be easy to association and obtain.Therefore, the present invention is not limited to detail and illustrative embodiment that the application provides and describes with regard to its broad aspect.Therefore, under the prerequisite of total inventive concept spirit that does not depart from the definition of claims and equivalent thereof or protection domain, can make various modifications.
Claims (7)
1. a magnetic resonance imaging apparatus is characterized in that, comprising:
Applying unit applies leaning magnetic field and high-frequency impulse to the subject that is placed in the static magnetic field;
High frequency coil unit, have respectively and to detect according to the described leaning magnetic field that applies and the described high-frequency impulse a plurality of coil components from the magnetic resonance signal of described subject radiation, output is based on by described a plurality of coil components signal of a plurality of passages of detected a plurality of magnetic resonance signals respectively;
A plurality of receiving circuits, its quantity are less than described a plurality of passage, receive and handle the arbitrary signal in the signal of described a plurality of passages respectively;
Select circuit, a plurality of matrix switch multistages ground is connected, the several magnetic resonance signals of selection from the signal of described a plurality of passages are input to described a plurality of receiving circuit respectively with the magnetic resonance signal of this selection;
Set the setup unit of imaging conditions; With
Determining unit according to the described imaging conditions of setting, is determined the connected mode of described a plurality of matrix switches.
2. magnetic resonance imaging apparatus according to claim 1 is characterized in that,
Described radio-frequency coil disposes a plurality of respectively at the mutually orthogonal both direction of described coil component,
Described setup unit is set the coil component that use as described photography conditions from described a plurality of coil components,
Described determining unit according to described should with coil component determine described connected mode.
3. magnetic resonance imaging apparatus according to claim 1 is characterized in that,
Described radio-frequency coil disposes a plurality of respectively at the mutually orthogonal both direction of described coil component,
Described setup unit is set as preferential service condition described photography conditions, described a plurality of coil components,
Described determining unit is determined described connected mode according to described preferential service condition.
4. magnetic resonance imaging apparatus according to claim 1 is characterized in that,
Described a plurality of matrix switch has the 1st section and the 2nd section matrix switch group, and described the 1st section and the 2nd section matrix switch group comprise a plurality of public m * n matrix switch respectively,
The a plurality of matrix switches that comprise in described the 1st section matrix switch group connect described a plurality of coil component respectively at its input end, and output terminal is connected respectively to the input end of the matrix switch that comprises in described the 2nd section matrix switch group,
The a plurality of matrix switches that comprise in described the 2nd section matrix switch group, several in its output terminal are connected respectively to described a plurality of receiving circuit.
5. a magnetic resonance imaging apparatus is characterized in that, comprising:
Transmission coil with a plurality of coil components;
Transtation mission circuit, its quantity are less than described a plurality of coil component, send the high-frequency impulse that is used for imposing on the subject that is placed on static magnetic field by described coil component;
Select circuit, a plurality of matrix switch multistages ground connected, from described a plurality of coil components selection several, the coil component of this selection is connected to described a plurality of transmitter;
Determining unit is determined the connected mode of described a plurality of matrix switches according to the size of described subject; With
Receiving coil according to the high-frequency impulse by described connected mode input, detects the electromagnetic field by the high frequency magnetic field radiation that produces from coil component under the state that has been applied in leaning magnetic field.
6. magnetic resonance imaging apparatus according to claim 5 is characterized in that,
Also have setup unit, this setup unit set in the size of field range, slice position or described subject at least each,
Described determining unit is determined described connected mode according to the setting result of described setup unit.
7. magnetic resonance imaging apparatus according to claim 5 is characterized in that,
Also have computing unit, this computing unit basis view data relevant with described subject calculated the size of described subject,
Described determining unit is determined described connected mode according to the size of the described subject that calculates by described computing unit.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP058901/2007 | 2007-03-08 | ||
| JP2007058901 | 2007-03-08 | ||
| JP033422/2008 | 2008-02-14 | ||
| JP2008033422A JP2008246192A (en) | 2007-03-08 | 2008-02-14 | Magnetic resonance imaging apparatus |
Publications (2)
| Publication Number | Publication Date |
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| CN101261315A true CN101261315A (en) | 2008-09-10 |
| CN101261315B CN101261315B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100821883A Active CN101261315B (en) | 2007-03-08 | 2008-03-07 | Magnetic resonance imaging apparatus |
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| JP (1) | JP2008246192A (en) |
| CN (1) | CN101261315B (en) |
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| CN102064050A (en) * | 2010-11-04 | 2011-05-18 | 芯通科技（成都）有限公司 | Matrix switch |
| CN102129054A (en) * | 2010-01-13 | 2011-07-20 | 西门子公司 | Spine coil array applied on a magnetic resonance device using improved imaging possibility |
| CN102334990A (en) * | 2010-07-20 | 2012-02-01 | 西门子公司 | Magnetic resonance device |
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| Publication number | Publication date |
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| JP2008246192A (en) | 2008-10-16 |
| CN101261315B (en) | 2011-12-28 |
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Effective date of registration: 20160725 Address after: Japan Tochigi Patentee after: Toshiba Medical System Co., Ltd. Address before: Tokyo, Japan, Japan Patentee before: Toshiba Corp Patentee before: Toshiba Medical System Co., Ltd. |