CN104414639A - Switch array, channel selecting device and MRI (Magnetic Resonance Imaging) system - Google Patents
Switch array, channel selecting device and MRI (Magnetic Resonance Imaging) system Download PDFInfo
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Abstract
The invention discloses a switch array, a channel selecting device and an MRI (Magnetic Resonance Imaging) system. The switch array comprises H stages of switch units, wherein H is greater than or equal to 2; a first-stage switch unit comprises at least two switch groups, an hth stage switch unit comprises at least one switch group, h is greater than 1 and smaller than H, an Hth stage switch unit comprises one switch group, each switch group comprises at least one switch, at least one switch group in the H stages of switch units comprises at least two switches, and the number of switches in a next-stage switch unit is smaller than the number of switches in a previous-stage switch unit; each switch comprises a first end and a second end, the first ends of the switches which are located in the same switch group are connected and used as a common end of the switch group where the switches are located, the second ends of the switches in the next-stage switch unit are connected with the common end of the switch group in the previous-stage switch unit in one-to-one correspondence. According to the switch array and the channel selecting device, provided by the invention, insert loss of a channel can be effectively reduced.
Description
Technical field
The present invention relates to signal transmission technology field, particularly a kind of switch arrays, channel selection device and magnetic resonance imaging system.
Background technology
Nuclear magnetic resonance (MRI, Magnetic Resonance Imaging) as nuclear magnetic resonance, NMR application key areas, due to its diagnostic message having fabulous resolving power, imaging parameters can provide abundant to human body soft tissue, do not have the plurality of advantages such as ionization radiation injury to human body, magnetic resonance imaging system is one of main tool becoming medical clinic applications.
In magnetic resonance imaging system, received the radiofrequency signal sent through human body by radio-frequency coil.Radiofrequency signal is through radio-frequency coil channel transfer to receiver channel, and the radiofrequency signal that imaging device receives according to receiver carries out imaging.In order to improve the signal to noise ratio of signal, the number of radio-frequency coil passage is often many than the number of receiver channel, so usually need a channel selection device to be connected between radio-frequency coil and receiver.
Fig. 1 is the structural representation of existing a kind of channel selection device.With reference to figure 1, described channel selection device comprises input switch unit 11, output switching element 12 and switch matrix unit 13.Described switch matrix unit 13 comprises that M is capable, N arranges the matrix switch be arranged in array, and described matrix switch comprises first end and the second end.Described input switch unit 11 comprises M input switch, described input switch comprises first end, the second end and the 3rd end: the first end correspondence of each input switch is connected a radio-frequency coil passage, second end correspondence of each input switch connects the first end being positioned at the matrix switch of same row in described switch matrix unit 13, and the 3rd end of each input switch is connected to ground by resistance R.Described output switching element 12 comprises N number of output switch, described output switch comprises first end, the second end and the 3rd end: the first end correspondence of each output switch is connected a receiver channel, second end correspondence of each output switch connects the second end being positioned at the matrix switch of same row in described switch matrix unit 13, and the 3rd end of each output switch is connected to ground by resistance R.Described matrix switch can be single-pole single-throw(SPST (SPST, single pole singlethrow) radio-frequency (RF) switch, and described input switch and output switch can be single-pole double throw (SPDT, single poledouble throw) radio-frequency (RF) switch.
Particularly, described input switch unit 11 connects M radio-frequency coil passage: radio-frequency coil passage I
1, radio-frequency coil passage I
2..., radio-frequency coil passage I
m..., radio-frequency coil passage I
m-1, radio-frequency coil passage I
m, 1≤m≤M.Described output switching element 12 connects N number of receiver channel: receiver channel O
1, receiver channel O
2..., receiver channel O
n..., receiver channel O
n-1, receiver channel O
n, 1≤n≤N.
Matrix switch in described channel selection device, input switch and output switch all also comprise the control end (not shown) being suitable for receiving different control signal.With by radio-frequency coil passage I
1on radio signal transmission to receiver channel O
2for example, control and described radio-frequency coil passage I
1the control end reception control signal of the input switch K1 connected makes the first end of described input switch K1 be connected with the second end, described radio-frequency coil passage I
1on radiofrequency signal arrive the first end of matrix switch K2; The control signal controlling described matrix switch K2 makes the first end of described matrix switch K2 be connected with the second end, described radio-frequency coil passage I
1on radiofrequency signal arrive second end of output switch K3; The control signal controlling described output switch K3 makes the first end of described output switch K3 be connected with the second end, described radio-frequency coil passage I
1on radiofrequency signal arrive receiver channel O
2.The first end of the input switch do not used is connected with three ends, and the first end of the output switch do not used is connected with the 3rd end.
But, the first end being positioned at the matrix switch of same a line is connected, the second end being positioned at the matrix switch of same string is connected, therefore, when forming a passage, be positioned at same a line and the matrix switch with string with the matrix switch of conducting in described switch matrix unit 13, can cause the leakage of signal, the insertion loss of passage is larger.
Summary of the invention
What the present invention solved is the problem that in signals transmission, the insertion loss of passage is large.
For solving the problem, technical solution of the present invention provides a kind of switch arrays, and described switch arrays comprise H level switch element, H >=2; Wherein, first order switch element comprises at least two switches set, h level switch element comprises at least one switches set, 1 < h < H, H level switch element comprises a switches set, each switches set comprises at least one switch, has at least a switches set to comprise at least two switches in described H level switch element, and the quantity of rear stage switch element breaker in middle is less than the quantity of previous stage switch element breaker in middle; Described switch comprises first end and the second end, the first end being positioned at the switch of same switches set is connected and as the common port of place switches set, and the common port of the switches set in the second end of the switch in rear stage switch element and previous stage switch element connects one to one.
Optionally, described switch also comprises control end; The each switches set being arranged in same one-level switch element includes J switch, J >=2, and in each switches set, the control end of a jth switch is connected, 1≤j≤J.
Based on above-mentioned switch arrays, technical solution of the present invention also provides a kind of channel selection device, and described channel selection device comprises: M switch arrays, and described switch arrays are above-mentioned switch arrays; M the first control unit, the common port that individual first control unit of m is suitable for the switches set of the H level switch element in control m switch arrays is connected with m first passage, 1≤m≤M; N number of second control unit, the second end that the n-th the second control units are suitable for the n-th switch of the first order switch element controlled in each switch arrays is connected with the n-th second channel, 1≤n≤N.
Optionally, described first control unit comprises first end, the second end and the 3rd end, the first end correspondence of m the first control unit connects described m first passage, second end correspondence of m the first control unit connects the common port of the switches set of the H level switch element in m switch arrays, and the 3rd end of m the first control unit is connected to ground by the first resistance;
Described second control unit comprises first end, the second end and the 3rd end, the first end correspondence of the n-th the second control units connects described n-th second channel, second end correspondence of the n-th the second control units connects the second end of the n-th switch of the first order switch element in each switch arrays, and the 3rd end of the n-th the second control units is connected to ground by the second resistance.
Based on above-mentioned switch arrays, technical solution of the present invention also provides another kind of channel selection device, and described channel selection device comprises: X the first switch arrays, and described first switch arrays are above-mentioned switch arrays; Y second switch array, described second switch array is above-mentioned switch arrays, and an xth y switch of first order switch element of the first switch arrays and an xth switch of the first order switch element of y second switch array are same switch, 1≤y≤Y, 1≤x≤X; X the first control unit, the common port that xth the first control unit is suitable for the switches set of the H level switch element controlled in xth the first switch arrays is connected with an xth first passage, 1≤x≤X; Y the second control unit, the common port that individual second control unit of y is suitable for the switches set of the H level switch element in control y second switch array is connected with y second channel, 1≤y≤Y.
Optionally, the order of X the first switch arrays presses first direction arrangement, and in each first switch arrays, the order of all switches of every one-level switch element is by described first direction arrangement, and the order of the switches set of every one-level switch element is by described first direction arrangement; The order of Y second switch array is by second direction arrangement, and in each second switch array, the order of all switches of every one-level switch element is by described second direction arrangement, and the order of the switches set of every one-level switch element is by described second direction arrangement.
Optionally, described first direction is from left to right, and described second direction is from top to bottom.
Technical solution of the present invention also provides a kind of magnetic resonance system, described magnetic resonance system comprises radio-frequency coil and receiver, also comprise above-mentioned channel selection device, first passage and second channel, described first passage and second channel are respectively radio-frequency coil passage and receiver channel.
Compared with prior art, technical scheme of the present invention has the following advantages:
Switch arrays comprise multiple-pole switch unit, every grade of switch element comprises switches set again, the first end being positioned at the switch of same switches set is connected and as the common port of place switches set, and the common port of the switches set in the second end of the switch in rear stage switch element and previous stage switch element connects one to one.When signal is in described switch arrays transmission, because the switch being positioned at same level switch element difference group in switch arrays is not connected, therefore, the switch that the switch passed through from signal in every grade of switch element is positioned at different groups can not cause leakage signal, thus reduces the insertion loss of passage.
In possibility, each switches set being arranged in same one-level switch element comprises the switch of equal number, and the control end being positioned at the switch of each switches set same position is connected, receive identical control signal, therefore, the device producing control signal can be reduced, reduce costs.On the other hand, due to the minimizing of control signal, transmit the corresponding minimizing of holding wire of described control signal, reduce further cost.
A kind of channel selection device that technical solution of the present invention provides comprises multiple described switch arrays, because described switch arrays reduce the insertion loss of passage, therefore, and the corresponding insertion loss reducing passage of described channel selection device.
The another kind of channel selection device that technical solution of the present invention provides comprises multiple first switch arrays and multiple second switch array, described first switch arrays are identical with the structure of above-mentioned switch arrays with the structure of second switch array, because described first switch arrays and second switch array all reduce the insertion loss of passage, therefore, described channel selection device further reduces the insertion loss of passage.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing a kind of channel selection device;
Fig. 2 is the structural representation of the switch arrays of the embodiment of the present invention 1;
Fig. 3 is the structural representation of the switch arrays of the embodiment of the present invention 2;
Fig. 4 is the structural representation of the switch arrays of the embodiment of the present invention 3;
Fig. 5 is the structural representation of the channel selection device of the embodiment of the present invention 4;
Fig. 6 is the structural representation of the channel selection device of the embodiment of the present invention 5.
Detailed description of the invention
Just as described in the background art, the channel selection device shown in Fig. 1, the first end being positioned at the matrix switch of same a line is connected, and the second end being positioned at the matrix switch of same string is connected.When a formation signal transmission passage, in described switch matrix unit 13, only there is a matrix switch conducting.But be positioned at same a line and the matrix switch with string with the matrix switch of conducting, owing to being connected with the matrix switch of described conducting, can cause the leakage of signal, the insertion loss of passage is larger.
Technical solution of the present invention provides a kind of switch arrays, and described switch arrays comprise: H level switch element, H >=2, and namely described switch arrays comprise at least two-stage switch element.
First order switch element comprises at least two switches set, and H level switch element comprises a switches set, and h level switch element comprises at least one switches set, 1 < h < H.
Each switches set comprises at least one switch, a switches set is had at least to comprise at least two switches in described H level switch element, the quantity of rear stage switch element breaker in middle is less than the quantity of previous stage switch element breaker in middle, and the switch namely in first order switch element is maximum.
Described switch comprises first end and the second end, the first end being positioned at the switch of same switches set is connected and as the common port of place switches set, and the common port of the switches set in the second end of the switch in rear stage switch element and previous stage switch element connects one to one.
When signal is in described switch arrays transmission, each switches set only has a switch conduction, decreases the switch that signal transmission passage connects, thus reduces the insertion loss of passage.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
Embodiment 1
Fig. 2 is the structural representation of the switch arrays of the embodiment of the present invention 1, and the switch in described switch arrays comprises first end and the second end, and described switch can be radio-frequency (RF) switch.In the present embodiment, be described to form the radio-frequency (RF) switch that the switch of switch arrays is single-pole single-throw(SPST.With reference to figure 2, described switch arrays comprise three step switch unit; Described three step switch unit is respectively first order switch element 21, second level switch element 22 and third level switch element 23.
Described first order switch element 21 comprises three switches set, and described second level switch element 22 comprises two switches set, and described third level switch element 23 comprises a switches set, and each switches set comprises at least one switch.Be arranged in same one-level switch element and first end be connected switch form a switches set, the switch being arranged in the different switches set of same one-level switch element is not connected.
Particularly, described first order switch element 21 comprises switches set 211, switches set 212 and switches set 213, wherein, described switches set 211 comprises three switches: K switch 211, K switch 212 and K switch 213, and described K switch 211, K switch 212 are connected with the first end of K switch 213 and as the common port of described switches set 211; Described switches set 212 comprises two switches: K switch 214 and K switch 215, and described K switch 214 is connected with the first end of K switch 215 and as the common port of described switches set 212; Described switches set 213 comprises a switch: K switch 216, and the first end of described K switch 216 is as the common port of described switches set 213.
Described second level switch element 22 comprises switches set 221 and switches set 222, wherein, described switches set 221 comprises two switches: K switch 221 and K switch 222, described K switch 221 is connected with the first end of K switch 222 and as the common port of described switches set 221, second end correspondence of described K switch 221 connects the common port of the switches set 211 in described first order switch element 21, and the second end correspondence of described K switch 222 connects the common port of the switches set 212 in described first order switch element 21; Described switches set 222 comprises a switch: K switch 223, the first end of described K switch 223 is as the common port of described switches set 222, second end correspondence of described K switch 223 connects the common port of the switches set 213 in described first order switch element 21, and namely the second end correspondence of described K switch 223 connects the first end of described K switch 216.
Described third level switch element 23(and afterbody switch element) comprise switches set 231, wherein, described switches set 231 comprises two switches: K switch 231 and K switch 232, described K switch 231 is connected with the first end of K switch 232 and as the common port of described switches set 231, second end correspondence of described K switch 231 connects the common port of the switches set 221 in described second level switch element 22, and the second end correspondence of described K switch 232 connects the common port of the switches set 222 in described second level switch element 22.
The first order switch element 21 of the switch arrays of the present embodiment comprises six switches, can form six signal transmission passages, forms six signal transmission passages in prior art, usually adopts the switch that six one end are connected.When forming a signal transmission passage in prior art, have a switch conduction in the switch that six one end are connected, all the other five switches all can cause leakage signal.
Switch arrays due to the present embodiment comprise multiple-pole switch unit, and every grade of switch element comprises again multiple switch, and the quantity of rear stage switch element breaker in middle is less than the quantity of previous stage switch element breaker in middle.When signal transmits in the switch arrays that the present embodiment provides, because the switch being positioned at same level switch element difference group in switch arrays is not connected, therefore, the switch that the switch passed through from signal in every grade of switch element is positioned at different groups can not cause leakage signal, thus reduces the insertion loss of passage.
Such as, when needing signal to transfer to the second end of the K switch 211 in described first order switch element 21 by the first end of the K switch 231 in described third level switch element 23, described K switch 231, K switch 221 and K switch 211 conducting, form signal transmission passage.
When needing signal to transfer to the second end of the K switch 216 in described first order switch element 21 by the first end of the K switch 232 in described third level switch element 23, described K switch 232, K switch 223 and K switch 216 conducting, form signal transmission passage.
It should be noted that, the quantity being arranged in each switches set breaker in middle of same one-level switch element can be identical, also can be different.In the present embodiment, the quantity being positioned at each switches set breaker in middle of same one-level switch element is different, is all example is mutually below described with the quantity of each switches set breaker in middle being positioned at same one-level switch element.
Embodiment 2
Still be described to form the radio-frequency (RF) switch that the switch of switch arrays is single-pole single-throw(SPST in the present embodiment, the switch in described switch arrays comprises first end and the second end, also comprises control end.The each switches set being arranged in same one-level switch element includes J switch, J >=2, and in each switches set, the control end of a jth switch is connected, 1≤j≤J.
Fig. 3 is the structural representation of the switch arrays of the embodiment of the present invention 2.With reference to figure 3, described switch arrays comprise three step switch unit; Described three step switch unit is respectively first order switch element 31, second level switch element 32 and third level switch element 33.
Described first order switch element 31 comprises switches set 311, switches set 312, switches set 313 and switches set 314, and wherein, described switches set 311 comprises two switches: K switch 311 and K switch 312; Described switches set 312 comprises two switches: K switch 313 and K switch 314; Described switches set 313 comprises two switches: K switch 315 and K switch 316; Described switches set 316 comprises two switches: K switch 317 and K switch 318.
Described second level switch element 32 comprises switches set 321 and switches set 322, and wherein, described switches set 321 comprises two switches: K switch 321 and K switch 322; Described switches set 322 comprises two switches: K switch 323 and K switch 324.
Described third level switch element 33 comprises switches set 331, and wherein, described switches set 331 comprises two switches: K switch 331 and K switch 332.
In described switch arrays, the annexation of the first end of each switch and the second end with reference to shown in figure 3 and the description of embodiment 1, can not repeat them here, be only described in detail to the connection of the control end of each switch below.
With reference to figure 3, with in one-level switch element, the control end being arranged in the switch of each switches set same position is connected.Particularly, be arranged in the control end of the K switch 311 of described first order switch element 31, the control end of K switch 313, the control end of K switch 315 be connected with the control end of K switch 317, be arranged in the control end of the K switch 312 of described first order switch element 31, the control end of K switch 314, the control end of K switch 316 be connected with the control end of K switch 318; The control end being arranged in the K switch 321 of described second level switch element 32 is connected with the control end of K switch 323, and the control end being arranged in the K switch 322 of described second level switch element 32 is connected with the control end of K switch 324.
Such as, when needing signal to transfer to the second end of the K switch 311 in described first order switch element 31 by the first end of the K switch 331 in described third level switch element 33, described K switch 331, K switch 321 and K switch 311 conducting, form signal transmission passage.
Because the control end of described K switch 323 is connected with the control end of described K switch 321, the conducting of described K switch 323; Because the control end of described K switch 313, the control end of K switch 315 are connected with the control end of described K switch 311 with the control end of K switch 317, described K switch 313, K switch 315 and K switch 317 conducting.But, due to described K switch 332 by, therefore, signal can not pass through other switches, can only through described K switch 331, K switch 321 and K switch 311 form signal transmission passage transmission.
In the same one-level switch element of the present embodiment, the control end being arranged in the switch of each switches set same position is connected, share same control signal, and in prior art, the control end of each switch is not connected, the control end of each switch receives different control signals.
Therefore, compared with prior art, the switch arrays of the present embodiment not only can reduce the insertion loss of passage, can also reduce the device producing control signal, reduce costs.On the other hand, due to the minimizing of control signal, transmit the corresponding minimizing of holding wire of described control signal, reduce further cost.
Embodiment 3
Fig. 4 is the structural representation of the switch arrays of the embodiment of the present invention 3.With reference to figure 4, embodiment 3 is with the difference of embodiment 2: the quantity being positioned at each switches set breaker in middle of one-level switch element can be identical, and the quantity being positioned at each switches set breaker in middle of another grade of switch element can be different.
With reference to figure 4, described switch arrays comprise three step switch unit: first order switch element 41, second level switch element 42 and third level switch element 43.Wherein, described first order switch element 41 comprises three switches set, and each switches set comprises the switch of equal number; Described second level switch element 42 comprises two switches set, and each switches set comprises the switch of varying number.The concrete structure of the switch arrays of the present embodiment, with reference to the description of figure 4 and embodiment 1 and embodiment 2, does not repeat them here.
Embodiment 4
Present embodiments provide a kind of channel selection device, described channel selection device comprises: M switch arrays, M the first control unit and N number of second control unit, N is the number of switches in described switch arrays in first order switch element.
Wherein, described switch arrays comprise H level switch element, and concrete structure can be the structure of switch arrays arbitrary shown in Fig. 2 to Fig. 4; The common port that individual first control unit of m is suitable for the switches set of H level (that is afterbody) switch element in control m switch arrays is connected with m first passage, 1≤m≤M; The second end that the n-th the second control units are suitable for the n-th switch of the first order switch element controlled in each switch arrays is connected with the n-th second channel, 1≤n≤N.
Comprise two-stage switch element for described switch arrays, be positioned at each switches set of the first order switch element of described switch arrays and include 5 switches, Fig. 5 is the structural representation of the channel selection device of the present embodiment.
Particularly, a described M switch arrays are: switch arrays R
1, switch arrays R
2..., switch arrays R
m-1, switch arrays R
m;
Described M the first control unit is: the first control unit C1
1, the first control unit C1
2..., the first control unit C1
m-1, the first control unit C1
m, wherein, described first control unit C1
1be suitable for controlling described switch arrays R
1in the common port of switches set of second level switch element (i.e. afterbody switch element) and first passage I
1connect, described first control unit C1
2be suitable for controlling described switch arrays R
2in the common port of switches set of second level switch element and first passage I
2connect ..., described first control unit C1
m-1be suitable for controlling described switch arrays R
m-1in the common port of switches set of second level switch element and first passage I
m-1connect, described first control unit C1
mbe suitable for controlling described switch arrays R
min the common port of switches set of second level switch element and first passage I
mconnect;
Described N number of second control unit is: the second control unit C2
1..., the second control unit C2
n, wherein, described second control unit C2
1be suitable for controlling described switch arrays R
1, switch arrays R
2..., switch arrays R
m-1, switch arrays R
min second end of first switch of first order switch element and second channel O
1connect ..., described second control unit C2
nbe suitable for controlling described switch arrays R
1, switch arrays R
2..., switch arrays R
m-1, switch arrays R
min second end of N number of switch of first order switch element and second channel O
nconnect.
The structure of described M the first control unit is identical, and the structure of N number of second control unit is identical, below with described first control unit C1
1with the second control unit C2
1for example is described first control unit of the present embodiment and the structure of the second control unit.
With reference to figure 5, in the present embodiment, described first control unit C1
1comprise first end, the second end and the 3rd end.Described first control unit C1
1first end correspondence connect described first passage I
1, described first control unit C1
1second end correspondence connect described switch arrays R
1in the common port of switches set of second level switch element, the first control unit C1
1the 3rd end be connected to ground by the first resistance R51.
Described second control unit C2
1comprise first end, the second end and the 3rd end.Described second control unit C2
1first end correspondence connect described second channel O
1, described second control unit C2
1second end correspondence connect described switch arrays R
1, switch arrays R
2..., switch arrays R
m-1, switch arrays R
min second end of first switch of first order switch element, described second control unit C2
1the 3rd end be connected to ground by the second resistance R52.
It should be noted that, described M the first control unit and described N number of second control unit can be all single-pole double throw RF switch, the resistance value of described first resistance R51 and the second resistance R52 can be equal, and concrete resistance value can be arranged according to the power of the signal that passage transmits.
The channel selection device of the present embodiment is connected between described first passage and second channel, be suitable for by the Signal transmissions on any one first passage to any one second channel, or by the Signal transmissions on any one second channel to any one first passage.
With needs by described first passage I
1on Signal transmissions to described second channel O
nfor example, control and described first passage I
1the the first control unit C1 connected
1first end be connected with the second end, by described first passage I
1on Signal transmissions to described switch arrays R
1;
Described first passage I
1on signal by described switch arrays R
1afterbody switch element input, through described switch arrays R
1transmission, described first passage I
1on signal by described switch arrays R
1n number of switch of first order switch element export to and described second channel O
nthe the second control unit C2 connected
nthe second end;
Control described second control unit C2
nfirst end be connected with the second end, described first passage I
1on Signal transmissions to described second channel O
n, Signal transmissions completes.
For removing described first passage I
1outer first passage, controls first end and the three-terminal link of the first coupled control unit; For removing described second channel O
nouter second channel, controls first end and the three-terminal link of the second coupled control unit.
In the present embodiment, described first passage is signal input channel, and described second channel is signal output channels, in other embodiments, described second channel can be signal input channel, and described first passage is signal output channels, and the present invention does not limit this.The process that signal transfers to described first passage by described second channel with reference to above description, can not repeat them here.
The channel selection device of the present embodiment comprises M switch arrays, and when signal is transferred to second channel by first passage by needs, signal transfers to second channel by the second control unit again through switch arrays.Because described switch arrays reduce the insertion loss of passage, therefore, the corresponding reduction of insertion loss of described channel selection device.
It should be noted that, the order of switch arrays described in the present embodiment is by direction arrangement from left to right, namely in each switch arrays, the order of all switches of every one-level switch element is by direction arrangement from left to right, and the order of the switches set of every one-level switch element is by direction arrangement from left to right.In other embodiments, the order of described switch arrays also can by direction arrangement from top to bottom.
Embodiment 5
Present embodiments provide another kind of channel selection device.Described channel selection device comprises: X the first switch arrays, a Y second switch array, X the first control unit and Y the second control unit, X is the number of switches in described second switch array in first order switch element, and Y is the number of switches in described first switch arrays in first order switch element.
Wherein, described first switch arrays and second switch array include H level switch element, concrete structure can be the structure of switch arrays arbitrary shown in Fig. 2 to Fig. 4, and an xth y switch of first order switch element of the first switch arrays and an xth switch of the first order switch element of y second switch array are same switch; The common port that xth the first control unit is suitable for the switches set of the H level switch element controlled in xth the first switch arrays is connected with an xth first passage, 1≤x≤X; The common port that individual second control unit of y is suitable for the switches set of the H level switch element in control y second switch array is connected with y second channel, 1≤y≤Y.
Include two-stage switch element for described first switch arrays and second switch array, be positioned at each switches set of the first order switch element of described first switch arrays and include 5 switches, be positioned at each switches set of the first order switch element of described second switch array and include two switches, Fig. 6 is the structural representation of the channel selection device of the present embodiment.
The order of described X the first switch arrays presses first direction arrangement, and in each first switch arrays, the order of all switches of every one-level switch element is by described first direction arrangement, and the order of the switches set of every one-level switch element is by described first direction arrangement;
The order of described Y second switch array is by second direction arrangement, and in each second switch array, the order of all switches of every one-level switch element is by described second direction arrangement, and the order of the switches set of every one-level switch element is by described second direction arrangement.
With reference to figure 6, in the present embodiment, described first direction is from left to right, described second direction is from top to bottom, and in other embodiments, described first direction and second direction can also be other directions, such as, described first direction is from right to left, and described second direction is that the present invention is not construed as limiting this from top to bottom.
Particularly, described X the first switch arrays are: the first switch arrays L
1, the first switch arrays L
2..., the first switch arrays L
x-1with the first switch arrays L
x;
Y switch of the first order switch element of an xth switch of the first order switch element of y second switch array in described Y second switch array and xth the first switch arrays is same switch, 1≤x≤X, 1≤y≤Y.Such as, first K switch 61 of the first order switch element of first second switch array is same switch with first K switch 61 of the first order switch element of described first switch arrays L1; First K switch 62 of the first order switch element of Y second switch array and first the first switch arrays L
1y the K switch 62 of first order switch element be same switch; X-1 K switch 63 of the first order switch element of first second switch array and X-1 the first switch arrays L
x-1first K switch 63 of first order switch element be same switch.
Described X the first control unit is: the first control unit C1
1, the first control unit C1
2..., the first control unit C1
x-1, the first control unit C1
x, wherein, described first control unit C1
1be suitable for controlling described first switch arrays L
1in the common port of switches set of second level switch element (i.e. afterbody switch element) and first passage I
1connect, described first control unit C1
2be suitable for controlling described first switch arrays L
2in the common port of switches set of second level switch element and first passage I
2connect ..., described first control unit C1
x-1be suitable for controlling described first switch arrays L
x-1in the common port of switches set of second level switch element and first passage I
x-1connect, described first control unit C1
xbe suitable for controlling described first switch arrays L
xin the common port of switches set of second level switch element and first passage I
xconnect;
Described Y the first control unit is: the second control unit C2
1..., the second control unit C2
y, wherein, described second control unit C2
1be suitable for common port and the second channel O of the switches set of the second level switch element (i.e. afterbody switch element) in control first second switch array
1connect ..., described second control unit C1
ybe suitable for common port and the second channel O of the switches set of the second level switch element in control Y second switch array
yconnect.
Described first control unit and described second control unit can be single-pole double throw RF switch, and 26S Proteasome Structure and Function is similar with the 26S Proteasome Structure and Function of the first control unit in embodiment 4 and the second control unit respectively, is not described in detail at this.The transmitting procedure of signal in the channel selection device of the present embodiment is similar to Example 4, does not repeat them here.
The channel selection device of the present embodiment comprises the first switch arrays and second switch array, because described first switch arrays and second switch array reduce the insertion loss of passage, therefore, when signal enters described channel selection device and exports described channel selection device, the insertion loss of passage all reduces, and further reduces the Channel depletion of described channel selection device.
Technical solution of the present invention additionally provides a kind of magnetic resonance imaging system, described magnetic resonance imaging system comprises radio-frequency coil, receiver, first passage and second channel, also comprise any one channel selection device shown in Fig. 5 or Fig. 6, described first passage and second channel are respectively radio-frequency coil passage and receiver channel.
When described first passage be radio-frequency coil passage, described second channel be receiver channel time, the quantity of described first passage is greater than the quantity of described second channel; When described second channel be radio-frequency coil passage, described first passage be receiver channel time, the quantity of described first passage is less than the quantity of described second channel.
As a rule, in magnetic resonance system, the quantity of described radio-frequency coil passage and described receiver channel is at least tens, cause the switch of leakage signal very many in channel selection device of the prior art shown in Fig. 1, and adopt the channel selection device of the embodiment of the present invention 4 and embodiment 5, because the switch being positioned at same level switch element difference group in switch arrays is not connected, therefore, the switch that the switch passed through from signal in every grade of switch element is positioned at different groups can not cause leakage signal, greatly reduces the insertion loss of passage.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (13)
1. switch arrays, is characterized in that, comprising: H level switch element, H >=2; Wherein,
First order switch element comprises at least two switches set, h level switch element comprises at least one switches set, 1 < h < H, H level switch element comprises a switches set, each switches set comprises at least one switch, have at least a switches set to comprise at least two switches in described H level switch element, the quantity of rear stage switch element breaker in middle is less than the quantity of previous stage switch element breaker in middle;
Described switch comprises first end and the second end, the first end being positioned at the switch of same switches set is connected and as the common port of place switches set, and the common port of the switches set in the second end of the switch in rear stage switch element and previous stage switch element connects one to one.
2. switch arrays according to claim 1, is characterized in that, described switch also comprises control end; The each switches set being arranged in same one-level switch element includes J switch, J >=2, and in each switches set, the control end of a jth switch is connected, 1≤j≤J.
3. switch arrays according to claim 1 and 2, is characterized in that, described switch is radio-frequency (RF) switch.
4. switch arrays according to claim 3, is characterized in that, described radio-frequency (RF) switch is single-pole single-throw(SPST radio-frequency (RF) switch.
5. a channel selection device, is characterized in that, comprising:
M switch arrays, described switch arrays are the switch arrays described in any one of Claims 1-4;
M the first control unit, the common port that individual first control unit of m is suitable for the switches set of the H level switch element in control m switch arrays is connected with m first passage, 1≤m≤M;
N number of second control unit, the second end that the n-th the second control units are suitable for the n-th switch of the first order switch element controlled in each switch arrays is connected with the n-th second channel, 1≤n≤N.
6. channel selection device according to claim 5, it is characterized in that, described first control unit comprises first end, the second end and the 3rd end, the first end correspondence of m the first control unit connects described m first passage, second end correspondence of m the first control unit connects the common port of the switches set of the H level switch element in m switch arrays, and the 3rd end of m the first control unit is connected to ground by the first resistance;
Described second control unit comprises first end, the second end and the 3rd end, the first end correspondence of the n-th the second control units connects described n-th second channel, second end correspondence of the n-th the second control units connects the second end of the n-th switch of the first order switch element in each switch arrays, and the 3rd end of the n-th the second control units is connected to ground by the second resistance.
7. channel selection device according to claim 6, is characterized in that, described first control unit is single-pole double throw RF switch, and described second control unit is single-pole double throw RF switch.
8. a channel selection device, is characterized in that, comprising:
X the first switch arrays, described first switch arrays are the switch arrays described in any one of Claims 1-4;
Y second switch array, described second switch array is the switch arrays described in any one of Claims 1-4, and an xth y switch of first order switch element of the first switch arrays and an xth switch of the first order switch element of y second switch array are same switch, 1≤y≤Y, 1≤x≤X;
X the first control unit, the common port that xth the first control unit is suitable for the switches set of the H level switch element controlled in xth the first switch arrays is connected with an xth first passage, 1≤x≤X;
Y the second control unit, the common port that individual second control unit of y is suitable for the switches set of the H level switch element in control y second switch array is connected with y second channel, 1≤y≤Y.
9. channel selection device according to claim 8, it is characterized in that, the order of X the first switch arrays presses first direction arrangement, in each first switch arrays, the order of all switches of every one-level switch element is by described first direction arrangement, and the order of the switches set of every one-level switch element is by described first direction arrangement; The order of Y second switch array is by second direction arrangement, and in each second switch array, the order of all switches of every one-level switch element is by described second direction arrangement, and the order of the switches set of every one-level switch element is by described second direction arrangement.
10. channel selection device according to claim 9, is characterized in that, described first direction is from left to right, and described second direction is from top to bottom.
11. channel selection devices according to claim 8, it is characterized in that, described first control unit comprises first end, the second end and the 3rd end, the first end correspondence of xth the first control unit connects a described xth first passage, second end correspondence of xth the first control unit connects the common port of the switches set of the H level switch element in xth the first switch arrays, and the 3rd end of xth the first control unit is connected to ground by the first resistance;
Described second control unit comprises first end, the second end and the 3rd end, the first end correspondence of y the second control unit connects described y second channel, second end correspondence of y the second control unit connects the common port of the switches set of the H level switch element in y second switch array, and the 3rd end of y the second control unit is connected to ground by the second resistance.
12. channel selection devices according to claim 11, is characterized in that, described first control unit is single-pole double throw RF switch, and described second control unit is single-pole double throw RF switch.
13. 1 kinds of magnetic resonance imaging systems, comprise radio-frequency coil and receiver, it is characterized in that, also comprise the channel selection device described in any one of claim 5 to 12, first passage and second channel, described first passage and second channel are respectively radio-frequency coil passage and receiver channel.
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