CN104459583B - A kind of localization method of the local coil of magnetic resonance device, device and system - Google Patents
A kind of localization method of the local coil of magnetic resonance device, device and system Download PDFInfo
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- CN104459583B CN104459583B CN201310422600.2A CN201310422600A CN104459583B CN 104459583 B CN104459583 B CN 104459583B CN 201310422600 A CN201310422600 A CN 201310422600A CN 104459583 B CN104459583 B CN 104459583B
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Abstract
Embodiment of the present invention discloses a kind of localization method of the local coil of magnetic resonance device, device and system.The localization method includes：The induced potential on one induction coil, the induction coil when local coil moves in the gradient magnetic of the magnetic resonance device is measured to be arranged at the fixed position relative of the local coil；The actual induction area and the induced potential of gradient switching rate, the induction coil based on the gradient magnetic, the induction coil is positioned in the gradient magnetic, and the local coil is positioned based on the induction coil positioning result.The present invention can position local coil without laser mark, simplify the flow of coil positioning, and can realize positioning during bed board enters magnetic field, without extra time of measuring.Embodiment of the present invention can measure the actual induction area of induction coil, therefore can extremely flexibly design induction coil shape, position and generating process.
Description
Technical field
The present invention relates to magnetic resonance arts, more particularly to a kind of positioning side of the local coil of magnetic resonance device
Method, positioner and alignment system.
Background technology
Magnetic resonance tomography (Magnetic Resonance Tomography, MRT) is with computer technology, electricity
Sub-circuit technology, superconduction body technique development and a kind of biomagnetism nuclear spin imaging technique for developing rapidly.It is utilized
Magnetic field makes the proton (i.e. H+) of precession in tissue that nutating generation radiofrequency signal occur with radio-frequency pulse, through computer processing
Imaging.Be placed on when object in magnetic field, with appropriate electromagnetic wave irradiation it, be allowed to resonate, then analyze it discharge electromagnetism
Ripple, it is possible to learn the nuclear position for forming this object and species, the accurate vertical of interior of articles can be depicted as accordingly
Body image.Such as the animation for the serial section that can be obtained by MRI scan human brain, opened by the crown
Begin, until sole.
In current magnetic resonance tomography device, many local coils for being used to receive magnetic resonance signal are had
(local coil).Local coil is generally relatively fixed with position of human body.In order to improve signal noise ratio (SNR), user is usual
Wish that the local coil closest to diagnostic region can be chosen, therefore have the demand positioned to local coil position.
The content of the invention
Embodiment of the present invention proposes a kind of method for the local coil for positioning magnetic resonance device, is marked without laser
Local coil is positioned, so as to simplify positioning flow, and positioning can be realized during bed board enters magnetic field, without extra
Time of measuring.
Embodiment of the present invention proposes a kind of device for the local coil for positioning magnetic resonance device, is marked without laser
Local coil is positioned, so as to simplify positioning flow, and positioning can be realized during bed board enters magnetic field, without extra
Time of measuring.
Embodiment of the present invention proposes a kind of induction coil for the local coil for positioning magnetic resonance device, is marked without laser
Local coil can be positioned, so as to simplify positioning flow, and positioning can be realized during bed board enters magnetic field, without
Extra time of measuring.
Embodiment of the present invention proposes a kind of system for the local coil for positioning magnetic resonance device, is marked without laser
Local coil is positioned, so as to simplify positioning flow, and positioning can be realized during bed board enters magnetic field, without extra
Time of measuring.
A kind of localization method of the local coil of magnetic resonance device, the localization method include：The local coil is measured at this
Induced potential when being moved in the gradient magnetic of magnetic resonance device on an induction coil, the induction coil are arranged on the part
At the fixed position relative of coil；The actual induction area of gradient switching rate, the induction coil based on the gradient magnetic
And the induced potential, the induction coil is positioned in the gradient magnetic, and be based on the induction coil positioning result pair
The local coil is positioned.
The induction coil, which is arranged at the fixed position relative of the local coil, to be included：The induction coil is set
For a part for the local coil.
The induction coil, which is arranged at the fixed position relative of the local coil, to be included：The induction coil is set
In the outside of the local coil, or the induction coil is arranged on to the inside of the local coil.
The localization method further comprises：Before the induction coil is positioned in the gradient magnetic, according to the sensing
The translational speed of potential, the magnetic field gradient and the local coil of the gradient magnetic in the gradient magnetic, determines the sense
Answer the actual induction area of coil.
The localization method further comprises：The actual induction area of the induction coil is determined by measuring.
Before the induction coil is positioned in the gradient magnetic, the localization method further comprises：Judge the sensing
Coil whether uniform motion, if it is not, then continuing to judge；If it is, the induction coil is positioned in the gradient magnetic.
The actual induction area of the induction coil is Seff；Induced potential on the induction coil is U；X is the sense
Answer coil from gradient magnetic center with a distance from, t is traveling time, and dx/dt is translational speed；G is magnetic field gradient；
Seff=-U/ (G dx/dt).
The actual induction area of the induction coil is Seff；Induced potential on the induction coil is U；X is the line of induction
Enclose from a distance from gradient magnetic center, t is traveling time, and dx/dt is translational speed；G is magnetic field gradient, and t is traveling time,
DG/dt is gradient switching rate；Wherein：
X=- (U+G SeffDx/dt)/(SeffDG/dt).
The localization method is carried out in real time during local coil enters the gradient magnetic of the magnetic resonance device.
A kind of positioner of the local coil of magnetic resonance device, the positioner includes a measuring unit and a positioning is single
Member, wherein：The measuring unit, sense for measuring when the local coil moves in the gradient magnetic of the magnetic resonance device one
Induced potential on coil, wherein the induction coil is arranged at the fixed position relative of the local coil；It is described fixed
Bit location, for the gradient switching rate based on the gradient magnetic, the actual induction area of the induction coil and the sense
Potential is answered, the induction coil is positioned in the gradient magnetic, and based on the induction coil positioning result to the local line
Circle is positioned.
The positioning unit, before being further used for positioning the induction coil in the gradient magnetic, according to the sense
The translational speed of the magnetic field gradient and the local coil of potential, the gradient magnetic in the gradient magnetic is answered, it is determined that described
The actual induction area of induction coil.
A kind of induction coil for being used to position the local coil of magnetic resonance device, the induction coil are arranged on the office
At the fixed position relative of portion's coil；The induction coil includes potential output contact；The potential exports contact, in the office
Portion's coil exports the induced potential signal on the induction coil when being moved in the gradient magnetic of the magnetic resonance device.
The induction coil is a part for local coil；The induction coil is arranged on the outside of the local coil；
Or the induction coil is arranged on the inside of the local coil.
A kind of alignment system of the local coil of magnetic resonance device, including：Positioner as described above；With it is as described above
Induction coil.It can be seen from the above technical proposal that in embodiments of the present invention, including：In the relatively solid of local coil
Determine opening position and induction coil is set；During local coil enters the gradient magnetic of the magnetic resonance device, the line of induction is measured
Induced potential on circle；The actual induction area of gradient switching rate (dG/dt), the induction coil based on the gradient magnetic with
And the induced potential, the induction coil is positioned in the gradient magnetic, and based on induction coil positioning result to local line
Circle is positioned.The present invention can position local coil without laser mark, simplify positioning flow, and can enter in bed board
Positioning is realized during magnetic field, without extra time of measuring.
Further, embodiment of the present invention can measure the actual induction area of induction coil, therefore can be extremely flexibly
Design induction coil shape, position and generating process.
Brief description of the drawings
Fig. 1 is the method flow diagram for the local coil that magnetic resonance device is positioned according to the present invention.
Fig. 2 is the schematic diagram for the local coil that magnetic resonance device is positioned according to the present invention.
Fig. 3 is the structure drawing of device for the local coil that magnetic resonance device is positioned according to the present invention.
Embodiment
In order that technical scheme and advantage are more clearly understood, below in conjunction with drawings and the embodiments, to this
Invention is further elaborated.It should be appreciated that embodiment described herein only illustrates this to illustrative
Invention, the protection domain being not intended to limit the present invention.
Fig. 1 is the method flow diagram for the local coil that magnetic resonance device is positioned according to the present invention.
As shown in figure 1, this method includes：
Step 101：Induction coil is set at the fixed position relative of local coil.
Herein, a part for local coil can be arranged to induction coil.Alternatively it is also possible to local coil it
Outer setting induction coil, or the induction coil is fixed in local coil.
Step 102：During local coil enters the gradient magnetic of the magnetic resonance device, measure on induction coil
Induced potential.
Local coil is typically secured near the bed board of magnetic resonance device.The gradient of magnetic resonance device is moved in bed board
When among magnetic field, among local coil is also with gradient magnetic is moved into, now induction coil also accordingly moves into gradient magnetic.
According to Faraday's electromagnetic induction law, induction coil also on will induce induced potential.
The generally open structure of induction coil, and go out in opening and export contact with potential, contact number is preferably two.
When being moved in gradient magnetic of the local coil in magnetic resonance device, potential output contact can export the sensing on induction coil
Electric potential signal.
Step 103：The actual induction area of gradient switching rate, the induction coil based on the gradient magnetic and described
Induced potential, the induction coil is positioned in the gradient magnetic, and local coil is carried out based on induction coil positioning result
Positioning.
Assuming that the induced potential on induction coil is U；Traveling time is t；Then：
U=-d Φ/dt；Wherein Φ is the magnetic flux by induction coil.
In magnetic resonance device, Φ=(B0+Gx)Seff；Wherein SeffFor the actual induction area of induction coil；X is sensing
Coil from gradient magnetic center with a distance from；B0For main field strength；G is gradient field strength；
Therefore, U=-GSeffDx/dt-SeffX dG/dt；DG/dt is gradient switching rate；
Wherein G can keep fixed, then：
U=-SeffDx/dt：
Therefore, the sensing can be determined according to the translational speed of induced potential, gradient magnetic field strength and induction coil
The actual induction area S of coileff, obtain：
Seff=-U/ (Gdx/dt).
And then obtain the position of induction coil, x=- (U+G SeffDx/dt)/(SeffDG/dt).
The translational speed according to induced potential, gradient magnetic field strength and local coil is foregoing provided, determines the sense
Answer the actual induction area S of coileffMethod.
Because embodiment of the present invention provides the actual induction area S of calculating induction coileffMode, therefore can be with
Very flexible design induction coil shape, position and generating process.
Alternatively it is also possible to the actual induction area of induction coil is measured in advance, and the line of induction measured in advance based on this
Enclose actual induction areal calculation x.
After x is calculated, i.e., it located induction coil in the gradient magnetic.Because induction coil is in local coil
At fixed position relative, therefore it is also based on induction coil positioning result and local coil is positioned.Preferably, in part
Coil is positioned in real time during entering the gradient magnetic of the magnetic resonance device to induction coil, and is based on the real-time positioning
As a result the local coil is positioned in real time.
In the method, it before the induction coil being positioned in the gradient magnetic, may further include, pass through part
The translational speed of coil judges whether the induced potential on induction coil is stablized, and local coil uniform motion illustrates on induction coil
Induced potential it is stable.By judging：If local coil and non-uniform movement, continue to judge, if local coil is at the uniform velocity
Motion, then carry out subsequent operation, i.e., the induction coil positioned in the gradient magnetic.
Fig. 2 is the schematic diagram for the local coil that magnetic resonance device is positioned according to the present invention.
As shown in Fig. 2 patient is lain on bed board, and has local coil at the fixed position relative of bed board, in the office
Induction coil S is provided with the fixed position relative of portion's coil.
When bed board is moved among the gradient magnetic of magnetic resonance device, local coil is also with being moved into gradient magnetic
Among, now induction coil also accordingly moves into gradient magnetic.
According to Faraday's electromagnetic induction law, induction coil also on will induce induced potential.
Assuming that the induced potential on induction coil S is U；The traveling time of bed board is t；Then：
U=-d Φ/dt；Wherein Φ is induced flux；
In magnetic resonance device, Φ=(B0+Gx)Seff；Wherein SeffFor the actual induction area of induction coil；X is sensing
Coil from gradient magnetic center with a distance from；B0For main field strength；G is gradient field strength；
Therefore, U=-GSeffDx/dt-SeffxdG/dt；
Wherein G can keep fixed, then：
U=-SeffDx/dt；
Therefore, the sensing can be determined according to the translational speed of induced potential, gradient magnetic field strength and local coil
The actual induction area S of coileff。
Seff=-U/ (Gdx/dt), and and then obtain the position of induction coil, x=- (U+G SeffDx/dt)/(SeffDG/
dt).X origin is the center of gradient magnetic.
After x is calculated, i.e., it located induction coil in the gradient magnetic.Because induction coil is in local coil
At fixed position relative, therefore it is also based on induction coil positioning result and local coil is positioned.
Based on above-mentioned labor, embodiment of the present invention also proposed a kind of local coil for positioning magnetic resonance device
Device.
Fig. 3 is the structure chart of the device for the local coil that magnetic resonance device is positioned according to embodiment of the present invention.
As shown in figure 3, the device includes measuring unit 301 and positioning unit 302, wherein：
Measuring unit 301, sense for measuring when the local coil moves in the gradient magnetic of the magnetic resonance device one
Induced potential on coil, wherein the induction coil is arranged at the fixed position relative of the local coil；
Positioning unit 302, the actual induction face for the gradient switching rate based on the gradient magnetic, the induction coil
Long-pending and described induced potential, the induction coil is positioned in the gradient magnetic, and be based on the induction coil positioning result
The local coil is positioned.
In one embodiment：
Positioning unit 302, before being further used for positioning the induction coil in the gradient magnetic, according to the sensing
Mobile speed of the magnetic field gradient and the local coil of induced potential, the gradient magnetic on coil in the gradient magnetic
Degree, determine the actual induction area of the induction coil.
Based on above-mentioned analysis, embodiment of the present invention also proposed a kind of local coil for being used to position magnetic resonance device
Induction coil.The induction coil is arranged at the fixed position relative of the local coil；It is defeated that the induction coil includes potential
Go out contact.Potential exports contact, during for being moved in gradient magnetic of the local coil in the magnetic resonance device described in output
Induced potential signal on induction coil；Wherein：Gradient switching rate, the induction coil based on the gradient magnetic it is effective
Induction area and the induced potential, the induction coil are positioned in the gradient magnetic, and local line's cycle basis
It is positioned in the positioning result of the induction coil.
In one embodiment：Induction coil is a part for local coil；The induction coil layout is in the office
The outside of portion's coil；Or the induction coil layout is in the inside of the local coil.
Based on above-mentioned analysis, what embodiment of the present invention also proposed a kind of local coil for positioning magnetic resonance device is
System.
The system includes：The device of the local coil of positioning magnetic resonance device as described above；And sense as described above
Answer coil.
In summary, in embodiments of the present invention, including：The line of induction is set at the fixed position relative of local coil
Circle；During local coil enters the gradient magnetic of the magnetic resonance device, the induced potential on induction coil is measured；It is based on
The gradient switching rate of the gradient magnetic, the actual induction area of the induction coil and the induced potential, in the gradient magnetic
The induction coil is positioned in, and local coil is positioned based on induction coil positioning result.The present invention is without laser
Mark can position local coil, simplify positioning flow, and can realize positioning during bed board enters magnetic field, without
Extra time of measuring.
Further, embodiment of the present invention can measure the actual induction area of induction coil, therefore can be extremely flexibly
Design induction coil shape, position and generating process.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., the protection of the present invention should be included in
Within the scope of.
Claims (12)
1. a kind of localization method of the local coil of magnetic resonance device, it is characterised in that the localization method includes：
The induced potential on one induction coil when the local coil moves in the gradient magnetic of the magnetic resonance device is measured, it is described
Induction coil is arranged at the fixed position relative of the local coil；
The actual induction area and the induced potential of gradient switching rate, the induction coil based on the gradient magnetic,
The induction coil is positioned in the gradient magnetic, and the local coil is determined based on the induction coil positioning result
Position.
2. localization method according to claim 1, it is characterised in that the induction coil is arranged on the local coil
Include at fixed position relative：
The induction coil is arranged to a part for the local coil；Or
The induction coil is arranged on to the outside of the local coil；Or
The induction coil is arranged on to the inside of the local coil.
3. localization method according to claim 1, it is characterised in that the localization method further comprises：In the gradient magnetic
Before the induction coil being positioned in,
According to the movement in the gradient magnetic of magnetic field gradient and the local coil of the induced potential, the gradient magnetic
Speed, determine the actual induction area of the induction coil；Or
The actual induction area of the induction coil is determined by measuring.
4. localization method according to claim 1, it is characterised in that positioned in the gradient magnetic induction coil it
Before, the localization method further comprises：
Judge the induction coil whether uniform motion, if it is not, then continuing to judge；It is if it is, fixed in the gradient magnetic
The position induction coil.
5. localization method according to claim 3, it is characterised in that
The actual induction area of the induction coil is Seff；Induced potential on the induction coil is U；X is the line of induction
Enclose from a distance from gradient magnetic center, t is traveling time, and dx/dt is mobile speed of the local coil in the gradient magnetic
Degree；G is magnetic field gradient；
Seff=-U/ (G dx/dt).
6. localization method according to claim 1, it is characterised in that SeffFor the actual induction area of the induction coil；
U is the induced potential on the induction coil；T is traveling time；X be induction coil from gradient magnetic center with a distance from, dx/dt
For translational speed of the local coil in the gradient magnetic；G is magnetic field gradient, and dG/dt is the gradient of the gradient magnetic
Switching rate；Wherein：
X=- (U+G Seff dx/dt)/(Seff dG/dt)。
7. according to the localization method any one of claim 1-6, it is characterised in that the localization method is in local coil
Carried out in real time during into the gradient magnetic of the magnetic resonance device.
8. a kind of positioner of the local coil of magnetic resonance device, it is characterised in that the positioner includes a measuring unit
And locating unit, wherein：
The measuring unit, for measuring one induction coil when the local coil moves in the gradient magnetic of the magnetic resonance device
On induced potential, wherein the induction coil is arranged at the fixed position relative of the local coil；
The positioning unit, for the gradient switching rate based on the gradient magnetic, the actual induction area of the induction coil
And the induced potential, the induction coil is positioned in the gradient magnetic, and be based on the induction coil positioning result pair
The local coil is positioned.
9. positioner according to claim 8, it is characterised in that
The positioning unit, before being further used for positioning the induction coil in the gradient magnetic, according to the induced electricity
The translational speed of gesture, the magnetic field gradient and the local coil of the gradient magnetic in the gradient magnetic, determines the sensing
The actual induction area of coil.
10. a kind of induction coil for being used to position the local coil of magnetic resonance device, it is characterised in that the induction coil is set
Put at the fixed position relative of the local coil；The induction coil includes potential output contact；
The potential exports contact, during for being moved in gradient magnetic of the local coil in the magnetic resonance device described in output
Induced potential signal on induction coil.
11. the induction coil according to claim 10 for being used to position the local coil of magnetic resonance device, it is characterised in that
The induction coil is a part for local coil；
The induction coil is arranged on the outside of the local coil；Or
The induction coil is arranged on the inside of the local coil.
A kind of 12. alignment system of the local coil of magnetic resonance device, it is characterised in that including：
Positioner as claimed in claim 8 or 9；With
Induction coil as described in claim 10 or 11.
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| CN110031784A (en) * | 2019-05-16 | 2019-07-19 | 上海联影医疗科技有限公司 | The localization method and magnetic resonance system of local coil |
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