CN102841328A - Vibration damper used for magnetic resonance imaging device and gradient coil comprising same - Google Patents
Vibration damper used for magnetic resonance imaging device and gradient coil comprising same Download PDFInfo
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- CN102841328A CN102841328A CN2011101723023A CN201110172302A CN102841328A CN 102841328 A CN102841328 A CN 102841328A CN 2011101723023 A CN2011101723023 A CN 2011101723023A CN 201110172302 A CN201110172302 A CN 201110172302A CN 102841328 A CN102841328 A CN 102841328A
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Abstract
The invention provides a vibration damper used for a magnetic resonance imaging device and a gradient coil comprising the vibration damper. The vibration of the gradient coil can be reduced by the vibration damper, so that the sound pressure level of the magnetic resonance imaging device is reduced. The vibration damper used for the magnetic resonance imaging device comprises a sensing component, an actuating component and a control device, wherein the sensing component is formed on a first surface of the gradient coil of the magnetic resonance imaging device; the actuating component is formed on a second surface opposite to the first surface of the gradient coil; and the control device is used for responding a sensing signal of the sensing component to control the actuating component to apply force to the gradient coil. The gradient coil disclosed by the invention comprises the vibration damper.
Description
Technical field
The present invention relates to MR imaging apparatus, be specifically related to a kind of gradient coil that is used for the vibration absorber of MR imaging apparatus and comprises this vibration absorber.
Background technology
Magnetic resonance imaging (MRI) system is prevalent in the medical diagnosis.In recent decades, people constantly attempt the MRI system is improved, obtaining high-quality image in the short time.Can obtain the image of various resolutions at present to concrete Diagnosis Application.
The MRI inspection utilizes the nuclear spin in the target object based on the reciprocation between main field, radio frequency (RF) magnetic field and the time-varying magnetic field gradient and forms images to be used for inspection.The MRI system generally includes main magnet, gradient coil and radio-frequency coil.Main magnet is set up uniform main field, makes atom pair RF excited operation response.Gradient coil applies the pulse interval gradient magnetic on main field, to provide the space indicate corresponding with its monodrome magnetic field to each point in the imaging region.Radio-frequency coil produces the pulse of excitation frequency, temporarily improves the energy level of atom.Computing machine forms image according to the energy attenuation situation that is measured by radio-frequency coil.
In above-mentioned imaging process, ubiquity is by the high magnetic field intensity of the current switching generation of main magnet and high speed gradient coil in the MRI scanner.The reciprocation of magnetic field and electric current causes the gradient coil vibration.The vibration of gradient coil drives the supporting construction vibration around it, and the vibration of gradient coil and the supporting construction in the MRI system thereof all can produce sound wave.These sound waves cause high acoustics sound pressure level (SPL) in the MRI system and around the MRI system.Particularly, the requirement of acquisition high quality graphic causes very high-caliber acoustic noise in very fast sweep time.
In the MRI of prior art system, adopted sound-insulation member to be set or to use mode such as sound-proof material to reduce noise, but still it is less or subtract too complicated problems of dry device to exist the vibration damping area, thereby can't reduces the noise in the MRI system effectively.Therefore, thus reducing sound pressure level in the MR imaging apparatus more cosily is checked patient to remain problem demanding prompt solution.
Summary of the invention
Therefore; The object of the present invention is to provide a kind of gradient coil that is used for the vibration absorber of MR imaging apparatus and comprises this vibration absorber; It can reduce the vibration of gradient coil, reduces the sound pressure level of MR imaging apparatus thus, thereby patient more cosily is checked.
On the one hand; The vibration absorber that is used for MR imaging apparatus according to the present invention can comprise: sensing element; Be formed on the first surface of gradient coil of said MR imaging apparatus, be used to respond to the radial displacement of said gradient coil and send displacement signal to control device; Actuation element is formed on the said first surface opposing second surface with said gradient coil; Control device, the displacement signal that is used to respond said sensing element is controlled said actuation element, so that this actuation element applies the power in the opposite direction of edge and said radial displacement to gradient coil.
Preferably, said sensing element and said actuation element can comprise piezoelectric.
Preferably, said sensing element can be made up of identical piezoelectric with said actuation element.
Preferably, said sensing element and said actuation element can be made up of piezoelectric ceramic piece.
Preferably, said first surface can be said gradient coil away from the surface of treating imaging object, said second surface can be said gradient coil near the surface of treating imaging object.
Preferably, said sensing element can comprise a plurality of sensing units, and separate the turning up the soil of longitudinal axis of the said gradient coil in said a plurality of sensing units edge is distributed on the said first surface; And said actuation element comprises a plurality of actuating units corresponding to said a plurality of sensing units, and said a plurality of actuating unit is distributed on the position corresponding with positions said a plurality of sensing units said second surface.
Preferably, said sensing unit can equal distance separated from one another.
Preferably; Said sensing element can comprise a plurality of sensing units; And be distributed in the quantity of the quantity of the sensing unit in the first area of said gradient coil greater than the sensing unit in these other zones first area that is distributed in said gradient coil, wherein said gradient coil at the Oscillation Amplitude of said first area greater than the Oscillation Amplitude in said other zones; And said actuation element comprises a plurality of actuating units corresponding to said a plurality of sensing units, and said a plurality of actuating unit is distributed on the position corresponding with positions said a plurality of sensing units said second surface.
Preferably, said sensing element can be formed on the whole said first surface, and said actuation element is formed on the whole said second surface.
Preferably; Said gradient coil can comprise along the aperture portion of the longitudinal direction of this gradient coil; And said first surface be said gradient coil with said aperture portion near surperficial internal layer adjacent surface of treating imaging object and said gradient coil with said aperture portion away from the said surperficial adjacent superficies of treating imaging object, said second surface be said gradient coil near the said inside surface of treating imaging object and said gradient coil away from the said outside surface of treating imaging object.
Preferably, the size of said actuation element applied force and said sense element senses to said radial displacement be directly proportional
Preferably, but said vibration absorber monoblock type be formed in the said gradient coil.
Preferably, said vibration absorber may be separately formed and is attached on the said gradient coil.
Preferably, said vibration absorber can be formed in the said gradient coil through the injection mo(u)lding monoblock type.
On the other hand, the gradient coil that is used for MR imaging apparatus according to the present invention can comprise aforesaid vibration absorber.
Description of drawings
Fig. 1 is the skeleton view of the gradient coil that is used for the MRI system of prior art;
Fig. 2 is the cut-open view according to the gradient coil that is furnished with vibration absorber of the first embodiment of the present invention;
Fig. 3 is the cut-open view of the gradient coil that is furnished with vibration absorber according to a second embodiment of the present invention;
Fig. 4 is the cut-open view of the gradient coil that is furnished with vibration absorber of a third embodiment in accordance with the invention;
Fig. 5 is the cut-open view of the gradient coil that is furnished with vibration absorber of a fourth embodiment in accordance with the invention.
Reference numeral in the accompanying drawing is following:
100: gradient coil
110: aperture portion
120: outside surface
130: inside surface
140: superficies
150: the internal layer surface
200,200 ', 400,400 ', 600,600 ': sensing element
201,202,203,204,401,402,403,404,601,602,603,604: sensing unit
300,300 ', 500,500 ', 700,700 ': actuation element
301,302,303,304,501,502,503,504,701,702,703,704: actuating unit
Embodiment
Fig. 1 is the skeleton view of the gradient coil that is used for the MRI system of prior art.As shown in Figure 1, the gradient coil 100 that typically is used for the MRI system is roughly hollow circular cylinder.In this gradient coil 100, can be formed with the aperture portion 110 that is used to hold shimming mechanism, said shimming mechanism is used to make the magnetic field of MRI system even.In the present embodiment, in this gradient coil 100, be formed with a plurality of aperture portion 110, its circumferencial direction along gradient coil evenly distributes and is positioned on the same periphery, and runs through whole gradient coil along the longitudinal direction of gradient coil.Aperture portion 110 can have rectangle (like rectangle or square) cross section.Gradient coil 100 has away from its longitudinal axis or away from the outside surface of treating imaging object 120, and near its longitudinal axis or near the inside surface of treating imaging object 130.Gradient coil 100 also have with aperture portion 110 near the longitudinal axis of gradient coil or near the surperficial internal layer adjacent surface 150 of treating imaging object, and with aperture portion 110 away from the longitudinal axis of gradient coil or away from the surperficial adjacent superficies 140 of treating imaging object.
Fig. 2 is vertical partial sectional view of the gradient coil of Fig. 1, and is disposed in this gradient coil according to the vibration absorber of first embodiment of the invention.
As shown in Figure 2, comprise sensing element 200, actuation element 300 and control device (not shown) according to the vibration absorber of first embodiment of the invention.In the present embodiment, sensing element 200 be formed on gradient coil away from the outside surface of treating imaging object 120, be used to respond to the radial displacement of gradient coil and send displacement signal to control device.Sensing element 200 can comprise a plurality of sensing units 201,202,203,204 that turn up the soil along the length direction of gradient coil is separate (equally spacedly in the present embodiment) distributes.Actuation element 300 be formed on gradient coil near on the inside surface of treating imaging object 130, be used for the instruction of receiving control device and apply power, to reduce or to eliminate the radial displacement of gradient coil to gradient coil.In the present embodiment, actuation element 300 can comprise a plurality of actuating units 301,302,303,304 that correspond respectively to a plurality of sensing units 201,202,203,204 distributions along the length direction of gradient coil.In another embodiment; A plurality of sensing units 201,202,203,204 and a plurality of actuating unit 301,302,303,304 can only be distributed in the bigger zone of the Oscillation Amplitude of gradient coil, and the quantity that perhaps is distributed in sensing unit and actuating unit in the bigger zone of the Oscillation Amplitude of gradient coil is greater than the sensing unit in the less zone of the Oscillation Amplitude that is distributed in gradient coil and the quantity of actuating unit.
Control device is used for the displacement signal of respond to element 200 and controls actuation element 300 so that this actuation element 300 applies power to gradient coil 100.In the present embodiment; When sensing element 200 is sensed the outside or inside radially displacement of gradient coil 100; Control device sends actuated signal according to the displacement signal that sensing element 200 produces to actuation element 300, and control actuation element 300 applies the power of edge and the radial displacement of gradient coil direction in the opposite direction to gradient coil.Actuation element 300 receives these actuated signals, applies the power of the edge direction opposite with the sense of displacement of gradient coil according to this actuated signal to gradient coil, to eliminate the displacement of gradient coil.In one embodiment; The radial displacement that sensing element 200 is sensed is big more; Then to apply the power of edge and the radial displacement of gradient coil direction in the opposite direction just big more for 300 of actuation elements; For example, the size of actuation element 300 applied forces can be directly proportional with the radial displacement that sensing element 200 is sensed.In one embodiment, control device adopts adaptive algorithm to handle according to the signal from sensing element 200, produces the control action that is used for actuation element then.In one embodiment, control device can adopt closed-loop control device, so that the performance of whole vibration absorber is more stable.Control device of the present invention can repeat no more at this for any conventional control device of controlling can realized of the prior art.
In addition, can for example form with gradient coil according to vibration absorber of the present invention through the injection mo(u)lding monoblock type.In another embodiment, vibration absorber according to the present invention may be separately formed, and is connected on the gradient coil through any connected mode (for example, bonding) then.
The vibration of the gradient coil that is caused by the reciprocation of magnetic field and electric current mainly comprises axially and radial vibration, wherein the radial displacement of gradient coil having the greatest impact to the sound pressure level of MRI system.Owing to sensing element and actuation element are added on the inside and outside surface of gradient coil as sensor and actuator; Particularly can be placed on the bigger position of Oscillation Amplitude of gradient coil; The radial motion of gradient coil can be effectively reduced according to vibration absorber of the present invention, thereby the vibration of gradient coil and the sound pressure level of gradient coil can be reduced effectively.In addition, because vibration absorber according to the present invention is distributed on the surface of whole gradient coil, thereby can suppress the vibration of gradient coil more broadly.
Fig. 3 is the horizontal partial sectional view of the gradient coil of Fig. 1, and is disposed in this gradient coil according to the vibration absorber of second embodiment of the invention.Vibration absorber according to second embodiment of the invention is substantially the same with the vibration absorber according to first embodiment of the invention on 26S Proteasome Structure and Function, and difference is sensing element 200 ' and actuation element 300 '.
As shown in Figure 3, vibration absorber comprises sensing element 200 ', actuation element 300 ' and control device (not shown).Sensing element 200 ' be formed on gradient coil away from the whole outer surface of treating imaging object 120.Actuation element 300 ' be formed on gradient coil near on the total inner surface of treating imaging object 130, with corresponding with sensing element 200 '.In another embodiment, sensing element 200 ' and actuation element 300 ' can only be formed in the bigger zone of the Oscillation Amplitude of gradient coil, on the outside surface 120 that perhaps can partly be formed on gradient coil as required respectively and the inside surface 130.
Fig. 4 is vertical partial sectional view of the gradient coil of Fig. 1, and is disposed in this gradient coil according to the vibration absorber of third embodiment of the invention.
Comprise first sensing element 400 and second sensing element 600, first actuation element 500 and second actuation element 700 and control device (not shown) according to the vibration absorber of this embodiment.First sensing element 400 be formed on gradient coil with aperture portion 110 near on the surperficial internal layer adjacent surface 150 of treating imaging object.First actuation element 500 be formed on gradient coil near on the inside surface of treating imaging object 130.In one embodiment, first sensing element 400 can comprise a plurality of first sensing units 401,402,403,404 that turn up the soil along the length direction of gradient coil is separate (equally spacedly in the present embodiment) distributes.First actuation element 500 can comprise a plurality of first actuating units 501,502,503,504 that correspond respectively to 401,402,403,404 distributions of a plurality of first sensing units along the length direction of gradient coil.Second sensing element 600 be formed on gradient coil with aperture portion 110 away from the surperficial adjacent superficies 140 of treating imaging object.Second actuation element 700 be formed on gradient coil away from the outside surface of treating imaging object 120.Second sensing element 600 can comprise a plurality of second sensing units 601,602,603,604 that turn up the soil along the length direction of gradient coil is separate (equally spacedly in the present embodiment) distributes.First actuation element 700 can comprise a plurality of first actuating units 701,702,703,704 that correspond respectively to 601,602,603,604 distributions of a plurality of second sensing units along the length direction of gradient coil.In the present embodiment, a plurality of first sensing units 401 first spacing to each other equals a plurality of second sensing units 601 second spacing to each other, but first spacing can be not equal to second spacing, but can adjust first spacing and second spacing as required.In addition; Be similar to first embodiment of the invention described above; In the bigger zone of the Oscillation Amplitude that a plurality of first sensing units 401,402,403,404 and a plurality of first actuating unit 501,502,503,504 can only be distributed in gradient coil, the quantity that perhaps is distributed in first sensing unit and second actuating unit in the bigger zone of the Oscillation Amplitude of gradient coil is greater than first sensing unit in the less zone of the Oscillation Amplitude that is distributed in gradient coil and the quantity of first actuating unit.Other 26S Proteasome Structure and Functions of present embodiment repeat no more at this with basic identical according to other 26S Proteasome Structure and Functions of first embodiment of the invention.
In the present embodiment, in gradient coil 100, be furnished with two groups of sensing elements and actuation element, thereby can more effectively monitor the vibration of responding to gradient coil and the vibration that correspondingly reduces gradient coil.Those skilled in the art also can be susceptible to and in gradient coil, arrange many group sensing elements and actuation element as required.In addition, those skilled in the art also can be susceptible to first sensing element and first actuation element that in gradient coil, only is provided with in the present embodiment.
Fig. 5 is the horizontal partial sectional view of the gradient coil of Fig. 1, and is disposed in this gradient coil according to the vibration absorber of fourth embodiment of the invention.Vibration absorber according to fourth embodiment of the invention is substantially the same with the vibration absorber according to third embodiment of the invention on 26S Proteasome Structure and Function, and difference is first sensing element 400 ' and second sensing element 600 ' and first actuation element 500 ' and second actuation element 700 '.
As shown in Figure 5, vibration absorber comprises first sensing element 400 ' and second sensing element 600 ', first actuation element 500 ' and second actuation element 700 ' and control device (not shown).First sensing element 400 ' be formed on gradient coil with aperture portion 110 near on the surperficial adjacent whole internal layer surface 150 of treating imaging object.First actuation element 500 ' be formed on gradient coil near on the total inner surface of treating imaging object 130.Second sensing element 600 ' be formed on gradient coil with aperture portion 110 away from the surperficial adjacent whole superficies 140 of treating imaging object.Second actuation element 700 ' be formed on gradient coil away from the whole outer surface of treating imaging object 120.In another embodiment; First sensing element 400 ' (or second sensing element 600 ') and first actuation element 500 ' (or second actuation element 700 ') can only be formed in the bigger zone of the Oscillation Amplitude of gradient coil, perhaps can partly be formed on respectively as required on internal layer surface 150 (or superficies 140) and inside surface 130 (or outside surface 120) of gradient coil.
Vibration absorber according to the present invention through the sense element senses gradient coil vibration and utilize actuation element to reduce the vibration of gradient coil, thereby can reduce the sound pressure level of gradient coil effectively.And, can be distributed on the entire longitudinal length of gradient coil according to vibration absorber of the present invention as required or be distributed on the bigger zone of the Oscillation Amplitude of gradient coil, thereby can control the vibration of gradient coil more widely.In addition, when the induction and actuation element all when processing, more help the control real-time of control device by piezoelectric (for example, piezoelectric ceramic piece), thereby make whole damping device structure simple, with low cost.
Claims (16)
1. vibration absorber that is used for MR imaging apparatus comprises: sensing element, be formed on the first surface of gradient coil of said MR imaging apparatus, and be used to respond to the radial displacement of said gradient coil and send displacement signal to control device; Actuation element, be formed on said gradient coil with said first surface opposing second surface on; Control device is used to respond the said displacement signal of said sensing element and controls said actuation element, so that this actuation element applies the power in the opposite direction with said radial displacement to gradient coil.
2. vibration absorber as claimed in claim 1 is characterized in that, said sensing element and said actuation element comprise piezoelectric.
3. vibration absorber as claimed in claim 2 is characterized in that, said sensing element is made up of identical piezoelectric with said actuation element.
4. vibration absorber as claimed in claim 3 is characterized in that, said sensing element and said actuation element are made up of piezoelectric ceramic piece.
5. vibration absorber as claimed in claim 1 is characterized in that, said first surface be said gradient coil away from the outside surface of treating imaging object, said second surface be said gradient coil near the inside surface of treating imaging object.
6. vibration absorber as claimed in claim 1 is characterized in that said sensing element comprises a plurality of sensing units, and separate the turning up the soil of longitudinal axis of the said gradient coil in said a plurality of sensing units edge is distributed on the said first surface; And said actuation element comprises a plurality of actuating units corresponding to said a plurality of sensing units, and said a plurality of actuating unit is distributed on the position corresponding with positions said a plurality of sensing units said second surface.
7. vibration absorber as claimed in claim 6 is characterized in that, said sensing unit equal distance separated from one another.
8. vibration absorber as claimed in claim 1; It is characterized in that; Said sensing element comprises a plurality of sensing units; And be distributed in the quantity of the quantity of the sensing unit in the first area of said gradient coil greater than the sensing unit in these other zones first area that is distributed in said gradient coil, wherein said gradient coil at the Oscillation Amplitude of said first area greater than the Oscillation Amplitude in said other zones; And
Said actuation element comprises a plurality of actuating units corresponding to said a plurality of sensing units, and said a plurality of actuating unit is distributed on the position corresponding with positions said a plurality of sensing units said second surface.
9. vibration absorber as claimed in claim 1 is characterized in that, said sensing element is formed on the whole said first surface, and said actuation element is formed on the whole said second surface.
10. vibration absorber as claimed in claim 1; It is characterized in that; Said gradient coil comprises along the aperture portion of the longitudinal direction of this gradient coil; And said first surface be said gradient coil with said aperture portion near surperficial internal layer adjacent surface of treating imaging object and said gradient coil with said aperture portion away from the said surperficial adjacent superficies of treating imaging object, said second surface be said gradient coil near the said inside surface of treating imaging object and said gradient coil away from the said outside surface of treating imaging object.
11. vibration absorber as claimed in claim 1 is characterized in that, said control device is for adopting the closed-loop control device of adaptive algorithm.
12. vibration absorber as claimed in claim 11 is characterized in that, the size of said actuation element applied force and said sense element senses to said radial displacement be directly proportional.
13. vibration absorber as claimed in claim 1 is characterized in that, said vibration absorber monoblock type is formed in the said gradient coil.
14. vibration absorber as claimed in claim 13 is characterized in that, said vibration absorber is formed in the said gradient coil through the injection mo(u)lding monoblock type.
15. vibration absorber as claimed in claim 1 is characterized in that, said vibration absorber forms separately and is attached on the said gradient coil.
16. a gradient coil that is used for MR imaging apparatus, this gradient coil comprise like each described vibration absorber in the claim 1 to 15.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5617026A (en) * | 1993-09-17 | 1997-04-01 | Hitachi Medical Corporation | Quiet magnetic resonance imaging apparatus |
| CN1265216A (en) * | 1996-09-27 | 2000-08-30 | 彼得曼斯菲尔德 | Active control of gradient coil acoustic output |
| CN1409124A (en) * | 2001-09-27 | 2003-04-09 | 西门子公司 | Nuclear spin laminagraphic device through mechanical vibration to reduce vibration and noise |
| US20040178792A1 (en) * | 2003-03-12 | 2004-09-16 | Edelstein William A. | Active vibration compensation for MRI gradient coil support to reduce acoustic noise in MRI scanners |
| CN1606699A (en) * | 2001-12-20 | 2005-04-13 | 皇家飞利浦电子股份有限公司 | Noise suppression in an open MR apparatus |
| CN1608209A (en) * | 2002-01-11 | 2005-04-20 | 西门子公司 | Magnetic resonance device comprising an eddy-current generator |
| CN1711480A (en) * | 2002-11-15 | 2005-12-21 | 皇家飞利浦电子股份有限公司 | MRI system having a gradient magnet system with a balance member |
| CN101063710A (en) * | 2006-04-26 | 2007-10-31 | 西门子公司 | Magnetic resonance device |
| JP2009261747A (en) * | 2008-04-28 | 2009-11-12 | Hitachi Medical Corp | Magnetic resonance imaging apparatus |
-
2011
- 2011-06-24 CN CN201110172302.3A patent/CN102841328B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5617026A (en) * | 1993-09-17 | 1997-04-01 | Hitachi Medical Corporation | Quiet magnetic resonance imaging apparatus |
| CN1265216A (en) * | 1996-09-27 | 2000-08-30 | 彼得曼斯菲尔德 | Active control of gradient coil acoustic output |
| CN1409124A (en) * | 2001-09-27 | 2003-04-09 | 西门子公司 | Nuclear spin laminagraphic device through mechanical vibration to reduce vibration and noise |
| CN1606699A (en) * | 2001-12-20 | 2005-04-13 | 皇家飞利浦电子股份有限公司 | Noise suppression in an open MR apparatus |
| CN1608209A (en) * | 2002-01-11 | 2005-04-20 | 西门子公司 | Magnetic resonance device comprising an eddy-current generator |
| CN1711480A (en) * | 2002-11-15 | 2005-12-21 | 皇家飞利浦电子股份有限公司 | MRI system having a gradient magnet system with a balance member |
| US20040178792A1 (en) * | 2003-03-12 | 2004-09-16 | Edelstein William A. | Active vibration compensation for MRI gradient coil support to reduce acoustic noise in MRI scanners |
| CN101063710A (en) * | 2006-04-26 | 2007-10-31 | 西门子公司 | Magnetic resonance device |
| JP2009261747A (en) * | 2008-04-28 | 2009-11-12 | Hitachi Medical Corp | Magnetic resonance imaging apparatus |
Non-Patent Citations (2)
| Title |
|---|
| 李霞 等: "一种全开放磁共振成像装置平面梯度线圈的新型设计方法", 《中国生物医学工程学报》 * |
| 陈俊 等: "磁共振弹性图中压电陶瓷驱动的横波成像", 《科学通报》 * |
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