CN102841328B - For MR imaging apparatus vibration absorber and comprise its gradient coil - Google Patents
For MR imaging apparatus vibration absorber and comprise its gradient coil Download PDFInfo
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- CN102841328B CN102841328B CN201110172302.3A CN201110172302A CN102841328B CN 102841328 B CN102841328 B CN 102841328B CN 201110172302 A CN201110172302 A CN 201110172302A CN 102841328 B CN102841328 B CN 102841328B
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Abstract
The invention provides for MR imaging apparatus vibration absorber and comprise the gradient coil of this vibration absorber, it can reduce the vibration of gradient coil, thus reduces the sound pressure level in MR imaging apparatus.This vibration absorber being used for MR imaging apparatus comprises: sensing element, is formed on the first surface of the gradient coil of described MR imaging apparatus; Actuation element, is formed on the second surface relative with the first surface of described gradient coil; Control device, for respond described sensing element actuated signal control described in actuation element apply power to make this actuation element to gradient coil.Gradient coil according to the present invention comprises above-mentioned vibration absorber.
Description
Technical field
The present invention relates to MR imaging apparatus, be specifically related to a kind of vibration absorber for MR imaging apparatus and comprise the gradient coil of this vibration absorber.
Background technology
Magnetic resonance imaging (MRI) system is prevalent in medical diagnosis.In recent decades, people constantly attempt to improve MRI system, can obtain high-quality image in the shorter time.The image of various resolution can be obtained at present for concrete diagnostic application.
MRI checks and utilizes nuclear spin in target object and imaging for inspection based on main field, reciprocation between radio frequency (RF) magnetic field and time-varying magnetic field gradient.MRI system generally includes main magnet, gradient coil and radio-frequency coil.Main magnet sets up uniform main field, and the operation of atom pair radio-frequency (RF) excited is responded.Gradient coil applies pulse interval gradient magnetic on the main magnetic field, to provide the space indicate corresponding with its monodrome magnetic field for each point in 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 measured by radio-frequency coil.
In above-mentioned imaging process, the high magnetic field intensity that ubiquity is produced by the current switching of main magnet and high speed gradient coil in MRI scanner.The reciprocation of magnetic field and electric current causes gradient coil to vibrate.The vibration of gradient coil drives the supporting construction vibration around it, and the vibration of gradient coil and the supporting construction in MRI system thereof all can produce sound wave.These sound waves cause high acoustics sound pressure level (SPL) in MRI system and around MRI system.Particularly, the requirement obtaining high quality graphic within sweep time quickly causes very high-caliber acoustic noise.
In the MRI system of prior art, have employed and sound-insulation member is set or uses the mode such as sound-proof material to reduce noise, but still it is less or subtract the too complicated problem of dry device to there is vibration damping area, thus effectively cannot reduce the noise in MRI system.Therefore, reduce the sound pressure level in MR imaging apparatus thus patient be more cosily checked remain problem demanding prompt solution.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of vibration absorber for MR imaging apparatus and comprise the gradient coil of this vibration absorber, it can reduce the vibration of gradient coil, reduces the sound pressure level of MR imaging apparatus thus, thus patient is more cosily checked.
On the one hand, can comprise according to the vibration absorber for MR imaging apparatus of the present invention: sensing element, be formed on the first surface of the gradient coil of described MR imaging apparatus, for responding to the radial displacement of described gradient coil and sending displacement signal to control device; Actuation element, is formed on the second surface relative with the described first surface of described gradient coil; Control device, the displacement signal for responding described sensing element controls described actuation element, applies along the power contrary with the direction of described radial displacement to gradient coil to make this actuation element.
Preferably, described sensing element and described actuation element can comprise piezoelectric.
Preferably, described sensing element can be made up of identical piezoelectric with described actuation element.
Preferably, described sensing element and described actuation element can be made up of piezoelectric ceramic piece.
Preferably, described first surface can be the surface away from object to be imaged of described gradient coil, and described second surface can be the surface of the object close to be imaged of described gradient coil.
Preferably, described sensing element can comprise multiple sensing unit, and described multiple sensing unit is distributed on described first surface along separate the turning up the soil of longitudinal axis of described gradient coil; And described actuation element comprises the multiple actuating units corresponding to described multiple sensing unit, and described multiple actuating unit is distributed on the position corresponding with the position of described multiple sensing unit of described second surface.
Preferably, described sensing unit can equal distance separated from one another.
Preferably, described sensing element can comprise multiple sensing unit, and the quantity being distributed in the sensing unit in the first area of described gradient coil is greater than the quantity of the sensing unit be distributed in other regions except this first area of described gradient coil, wherein said gradient coil is greater than the Oscillation Amplitude in other regions described at the Oscillation Amplitude of described first area; And described actuation element comprises the multiple actuating units corresponding to described multiple sensing unit, and described multiple actuating unit is distributed on the position corresponding with the position of described multiple sensing unit of described second surface.
Preferably, described sensing element can be formed on whole described first surface, and described actuation element is formed on whole described second surface.
Preferably, described gradient coil can comprise the aperture portion of the longitudinal direction along this gradient coil, and described first surface be adjacent with the surface of the object close to be imaged of the described aperture portion internal layer surface of described gradient coil and described gradient coil with the superficies adjacent away from the surface of described object to be imaged of described aperture portion, described second surface is the inside surface of the close described object to be imaged of described gradient coil and the outside surface away from described object to be imaged of described gradient coil.
Preferably, described actuation element applied force size and described sense element senses to described radial displacement be directly proportional
Preferably, described vibration absorber can monoblock type be formed in described gradient coil.
Preferably, described vibration absorber may be separately formed and is attached on described gradient coil.
Preferably, described vibration absorber is formed in described gradient coil by injection mo(u)lding monoblock type.
On the other hand, vibration absorber as above can be comprised according to the gradient coil for MR imaging apparatus of the present invention.
Accompanying drawing explanation
Fig. 1 is the skeleton view for the gradient coil in MRI system of prior art;
Fig. 2 is the cut-open view being furnished with the gradient coil of vibration absorber according to the first embodiment of the present invention;
Fig. 3 is the cut-open view being furnished with the gradient coil of vibration absorber according to a second embodiment of the present invention;
Fig. 4 is the cut-open view being furnished with the gradient coil of vibration absorber according to the third embodiment of the invention;
Fig. 5 is the cut-open view being furnished with the gradient coil of vibration absorber according to a fourth embodiment of the invention.
Reference numeral in accompanying drawing is as follows:
100: gradient coil
110: aperture portion
120: outside surface
130: inside surface
140: superficies
150: 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 for the gradient coil in MRI system of prior art.As shown in Figure 1, typically hollow circular cylinder is roughly for the gradient coil 100 in MRI system.Can be formed with the aperture portion 110 for holding shimming mechanism in this gradient coil 100, described shimming mechanism is for making the field homogeneity of MRI system.In the present embodiment, in this gradient coil 100, be formed with multiple aperture portion 110, its circumferencial direction along gradient coil is uniformly distributed and is positioned on same periphery, and runs through whole gradient coil along the longitudinal direction of gradient coil.Aperture portion 110 can have rectangle (as rectangle or square) cross section.Gradient coil 100 has away from its longitudinal axis or the outside surface 120 away from object to be imaged, and near its longitudinal axis or the inside surface 130 near object to be imaged.Gradient coil 100 also has and the longitudinal axis of the close gradient coil of aperture portion 110 or the internal layer surface 150 adjacent near the surface of object to be imaged, and with the longitudinal axis away from gradient coil of aperture portion 110 or away from the adjacent superficies 140 in the surface of object to be imaged.
Fig. 2 is longitudinal partial sectional view of the gradient coil of Fig. 1, and vibration absorber is according to a first embodiment of the present invention disposed in this gradient coil.
As shown in Figure 2, vibration absorber according to a first embodiment of the present invention comprises sensing element 200, actuation element 300 and control device (not shown).In the present embodiment, sensing element 200 be formed in gradient coil away from the outside surface 120 of object to be imaged, for responding to the radial displacement of gradient coil and sending displacement signal to control device.Sensing element 200 can comprise multiple sensing units 201,202,203,204 that the length direction separate turn up the soil (in the present embodiment, equally spacedly) along gradient coil distributes.Actuation element 300 is formed on the inside surface 130 of the object close to be imaged of gradient coil, for receiving control device instruction and to gradient coil apply power, to reduce or to eliminate the radial displacement of gradient coil.In the present embodiment, actuation element 300 length direction that can comprise along gradient coil corresponds respectively to multiple actuating units 301,302,303,304 of multiple sensing unit 201,202,203,204 distribution.In another embodiment, multiple sensing unit 201,202,203,204 and multiple actuating unit 301,302,303,304 can only be distributed in the larger region of the Oscillation Amplitude of gradient coil, or the quantity of sensing unit in the larger region of the Oscillation Amplitude being distributed in gradient coil and actuating unit is greater than the quantity of sensing unit in the less region of the Oscillation Amplitude that is distributed in gradient coil and actuating unit.
Control device is for responding the displacement signal of sensing element 200 and controlling actuation element 300 and apply power to make this actuation element 300 to gradient coil 100.In the present embodiment, when sensing element 200 senses the outside or inside radially displacement of gradient coil 100, the displacement signal that control device produces according to sensing element 200 sends actuated signal to actuation element 300, controls actuation element 300 and applies along the radial displacement side's power in the opposite direction with gradient coil to gradient coil.Actuation element 300 receives this actuated signal, applies the power in the direction contrary with the sense of displacement of gradient coil, edge, to eliminate the displacement of gradient coil according to this actuated signal to gradient coil.In one embodiment, the radial displacement that sensing element 200 senses is larger, then actuation element 300 apply along larger with radial displacement side's power in the opposite direction of gradient coil, such as, the radial displacement that the size of actuation element 300 applied force can sense to sensing element 200 is directly proportional.In one embodiment, control device adopts adaptive algorithm to process according to the signal from sensing element 200, then produces the control action being used for actuation element.In one embodiment, control device can adopt closed-loop control device, to make the performance of whole vibration absorber more stable.Control device of the present invention can be any conventional control units that can realize controlling of the prior art, does not repeat them here.
Sensing element 200 and actuation element 300 can comprise piezoelectric.In one embodiment, sensing element 200 can be made up of identical piezoelectric (such as, piezoelectric ceramic piece) with actuation element 300.Because sensing element 200 and actuation element 300 use identical piezoelectric, can realize controlling in real time better to vibration absorber.In one embodiment, sensing element 200 can be identical with the size and dimension of each actuating unit with each sensing unit in actuation element 300.
In addition, such as can be formed by injection mo(u)lding monoblock type with gradient coil according to vibration absorber of the present invention.In another embodiment, vibration absorber according to the present invention may be separately formed, and is then connected on gradient coil by any connected mode (such as, bonding).
The vibration of the gradient coil caused by the reciprocation of magnetic field and electric current mainly comprises axis and radial vibration, wherein radial displacement the having the greatest impact to the sound pressure level of MRI system of gradient coil.Due to sensing element and actuation element are added on gradient coil inside and outside surface on as sensor and actuator, particularly can be placed on the position that the Oscillation Amplitude of gradient coil is larger, the radial motion of gradient coil can be effectively reduced according to vibration absorber of the present invention, thus effectively can reduce the vibration of gradient coil and the sound pressure level of gradient coil.In addition, because vibration absorber according to the present invention is distributed on the surface of whole gradient coil, thus the vibration of gradient coil can be suppressed more broadly.
Fig. 3 is the horizontal partial sectional view of the gradient coil of Fig. 1, and vibration absorber is according to a second embodiment of the present invention disposed in this gradient coil.Vibration absorber is according to a second embodiment of the present invention substantially the same with vibration absorber according to a first embodiment of the present 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 in gradient coil away from the whole outside surface 120 of object to be imaged.Actuation element 300 ' is formed on the whole inside surface 130 of the object close to be imaged of gradient coil, with corresponding with sensing element 200 '.In another embodiment, sensing element 200 ' and actuation element 300 ' can only be formed in the larger region of the Oscillation Amplitude of gradient coil, or on the outside surface 120 that can partly be formed in gradient coil as required respectively and inside surface 130.
Fig. 4 is longitudinal partial sectional view of the gradient coil of Fig. 1, and vibration absorber is according to a third embodiment of the present invention disposed in this gradient coil.
The first sensing element 400 and the second sensing element 600, first actuation element 500 and the second actuation element 700 and control device (not shown) is comprised according to the vibration absorber of this embodiment.First sensing element 400 is formed on the internal layer surface 150 adjacent with the surface of the object close to be imaged of aperture portion 110 of gradient coil.First actuation element 500 is formed on the inside surface 130 of the object close to be imaged of gradient coil.In one embodiment, the first sensing element 400 can comprise multiple first sensing units 401,402,403,404 that the length direction separate turn up the soil (in the present embodiment, equally spacedly) along gradient coil distributes.First actuation element 500 length direction that can comprise along gradient coil corresponds respectively to multiple first actuating units 501,502,503,504 that multiple first sensing unit 401,402,403,404 distributes.Second sensing element 600 be formed in gradient coil with on the superficies 140 adjacent away from the surface of object to be imaged of aperture portion 110.Second actuation element 700 be formed in gradient coil away from the outside surface 120 of object to be imaged.Second sensing element 600 can comprise multiple second sensing units 601,602,603,604 that the length direction separate turn up the soil (in the present embodiment, equally spacedly) along gradient coil distributes.First actuation element 700 length direction that can comprise along gradient coil corresponds respectively to multiple first actuating units 701,702,703,704 that multiple second sensing unit 601,602,603,604 distributes.In the present embodiment, multiple first sensing units 401 the first spacing to each other equals multiple second sensing units 601 the second spacing to each other, but the first spacing can be not equal to the second spacing, but can adjust the first spacing and the second spacing as required.In addition, be similar to first embodiment of the invention described above, in the region that the Oscillation Amplitude that multiple first sensing units 401,402,403,404 and multiple first actuating unit 501,502,503,504 only can be distributed in gradient coil is larger, or the quantity of the first sensing unit in the larger region of the Oscillation Amplitude being distributed in gradient coil and the second actuating unit is greater than the quantity of the first sensing unit in the less region of the Oscillation Amplitude that is distributed in gradient coil and the first actuating unit.Other 26S Proteasome Structure and Functions of the present embodiment are substantially identical with other 26S Proteasome Structure and Functions according to a first embodiment of the present invention, do not repeat them here.
In the present embodiment, in gradient coil 100, be furnished with two groups of sensing elements and actuation element, thus the vibration more effectively can monitoring induction gradient coil also correspondingly reduces the vibration of 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 in gradient coil, only arrange the first sensing element in the present embodiment and the first actuation element.
Fig. 5 is the horizontal partial sectional view of the gradient coil of Fig. 1, and vibration absorber is according to a fourth embodiment of the present invention disposed in this gradient coil.Vibration absorber is according to a fourth embodiment of the present invention substantially the same with vibration absorber according to a third embodiment of the present invention on 26S Proteasome Structure and Function, and difference is the first sensing element 400 ' and the second sensing element 600 ' and the first actuation element 500 ' and the second actuation element 700 '.
As shown in Figure 5, vibration absorber comprises the first sensing element 400 ' and the second sensing element 600 ', the first actuation element 500 ' and the second actuation element 700 ' and control device (not shown).First sensing element 400 ' is formed on the whole internal layer surface 150 adjacent with the surface of the object close to be imaged of aperture portion 110 of gradient coil.First actuation element 500 ' is formed on the whole inside surface 130 of the object close to be imaged of gradient coil.Second sensing element 600 ' be formed in gradient coil with on the whole superficies 140 adjacent away from the surface of object to be imaged of aperture portion 110.Second actuation element 700 ' be formed in gradient coil away from the whole outside surface 120 of object to be imaged.In another embodiment, first sensing element 400 ' (or second sensing element 600 ') and the first actuation element 500 ' (or second actuation element 700 ') can only be formed in the larger region of the Oscillation Amplitude of gradient coil, or on the internal layer surface 150 (or superficies 140) that partly can be formed in gradient coil as required respectively and inside surface 130 (or outside surface 120).
Vibration absorber according to the present invention is by the vibration of sense element senses gradient coil and utilize actuation element to reduce the vibration of gradient coil, thus effectively can reduce the sound pressure level of gradient coil.And, on the whole longitudinal length that can be distributed in gradient coil according to vibration absorber of the present invention as required or be distributed on the larger region of the Oscillation Amplitude of gradient coil, thus broadly can control the vibration of gradient coil.In addition, when responding to and actuation element is all made up of piezoelectric (such as, piezoelectric ceramic piece), being more conducive to the control real-time of control device, thus making whole damping device structure simple, with low cost.
Claims (16)
1. for a vibration absorber for MR imaging apparatus, comprising: sensing element, be formed on the first surface of the gradient coil of described MR imaging apparatus, for responding to the radial displacement of described gradient coil and sending displacement signal to control device; Actuation element, is formed on the second surface relative with described first surface of described gradient coil; Control device, controls described actuation element for responding institute's displacement signal of described sensing element, applies the power contrary with the direction of described radial displacement to make this actuation element to gradient coil.
2. vibration absorber as claimed in claim 1, it is characterized in that, described sensing element and described actuation element comprise piezoelectric.
3. vibration absorber as claimed in claim 2, it is characterized in that, described sensing element is made up of identical piezoelectric with described actuation element.
4. vibration absorber as claimed in claim 3, it is characterized in that, described sensing element and described actuation element are made up of piezoelectric ceramic piece.
5. vibration absorber as claimed in claim 1, it is characterized in that, described first surface is the outside surface away from object to be imaged of described gradient coil, and described second surface is the inside surface of the object close to be imaged of described gradient coil.
6. vibration absorber as claimed in claim 1, it is characterized in that, described sensing element comprises multiple sensing unit, and described multiple sensing unit is distributed on described first surface along separate the turning up the soil of longitudinal axis of described gradient coil; And described actuation element comprises the multiple actuating units corresponding to described multiple sensing unit, and described multiple actuating unit is distributed on the position corresponding with the position of described multiple sensing unit of described second surface.
7. vibration absorber as claimed in claim 6, is characterized in that, described sensing unit equal distance separated from one another.
8. vibration absorber as claimed in claim 1, it is characterized in that, described sensing element comprises multiple sensing unit, and the quantity being distributed in the sensing unit in the first area of described gradient coil is greater than the quantity of the sensing unit be distributed in other regions except this first area of described gradient coil, wherein said gradient coil is greater than the Oscillation Amplitude in other regions described at the Oscillation Amplitude of described first area; And
Described actuation element comprises the multiple actuating units corresponding to described multiple sensing unit, and described multiple actuating unit is distributed on the position corresponding with the position of described multiple sensing unit of described second surface.
9. vibration absorber as claimed in claim 1, it is characterized in that, described sensing element is formed on whole described first surface, and described actuation element is formed on whole described second surface.
10. vibration absorber as claimed in claim 1, it is characterized in that, described gradient coil comprises the aperture portion of the longitudinal direction along this gradient coil, and described first surface be adjacent with the surface of the object close to be imaged of the described aperture portion internal layer surface of described gradient coil and described gradient coil with the superficies adjacent away from the surface of described object to be imaged of described aperture portion, described second surface is the inside surface of the close described object to be imaged of described gradient coil and the outside surface away from described object to be imaged of described gradient coil.
11. vibration absorbers as claimed in claim 1, is characterized in that, described control device is the closed-loop control device adopting adaptive algorithm.
12. vibration absorbers as claimed in claim 11, is characterized in that, the size of described actuation element applied force and described sense element senses to described radial displacement be directly proportional.
13. vibration absorbers as claimed in claim 1, it is characterized in that, described vibration absorber monoblock type is formed in described gradient coil.
14. vibration absorbers as claimed in claim 13, it is characterized in that, described vibration absorber is formed in described gradient coil by injection mo(u)lding monoblock type.
15. vibration absorbers as claimed in claim 1, it is characterized in that, described vibration absorber is formed separately and is attached on described gradient coil.
16. 1 kinds of gradient coils for MR imaging apparatus, this gradient coil comprises the vibration absorber according to any one of claim 1 to 15.
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