Magnetic resonance imaging device with sound-absorbing means
First Claim
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1. A magnetic resonance imaging (MRI) device comprising:
- a diagnostic space,a main magnetic system for generating a main magnetic field in said diagnostic space,a gradient magnetic coil system comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means for reducing noise that is generated as a result of vibrations of the gradient coil, wherein the noise reducing means comprise a sound-absorbing panel disposed between the gradient coil and the diagnostic space wherein the sound-absorbing panel comprises channels having an open end and a closed end, wherein at least one of;
the channels extend at least substantially perpendicularly to the direction between the diagnostic space and the gradient coil, at least on the side of their closed ends;
a cross dimension of at least a part of the channels on the side of the associated open ends is maximally 15 mm, preferably maximally 10 mm;
minimum spacing between adjacent channels at the location of the associated maximum cross dimension of the adjacent channels is maximally 50% of the sum of the associated maximum cross dimensions, preferably maximally 35% of the sum of the associated maximum cross dimensions;
dimensions of the channels of the sound-absorbing panel are mutually different;
the sound absorbing panel is built up of a number of abutting, preferably glued-together subpanels;
orthe sound-absorbing panel is coated between the open ends with a sound-absorbing material having an absorption coefficient of at least 0.5 for at least part of the frequency range between 20 Hz and 4000 Hz.
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Abstract
The invention provides a magnetic resonance imaging (MRI) device (21), comprising a diagnostic space (25), a main magnetic system (22) for generating a main magnetic field in said diagnostic space, a gradient magnetic coil system (23) comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means (29, 32) for reducing noise that is generated as a result of vibrations of the gradient coil. The noise reducing means comprise a sound-absorbing panel (29) disposed between the gradient coil and the diagnostic space. The sound-absorbing panel (29) comprises channels having an open end and a closed end.
18 Citations
18 Claims
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1. A magnetic resonance imaging (MRI) device comprising:
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a diagnostic space, a main magnetic system for generating a main magnetic field in said diagnostic space, a gradient magnetic coil system comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means for reducing noise that is generated as a result of vibrations of the gradient coil, wherein the noise reducing means comprise a sound-absorbing panel disposed between the gradient coil and the diagnostic space wherein the sound-absorbing panel comprises channels having an open end and a closed end, wherein at least one of; the channels extend at least substantially perpendicularly to the direction between the diagnostic space and the gradient coil, at least on the side of their closed ends; a cross dimension of at least a part of the channels on the side of the associated open ends is maximally 15 mm, preferably maximally 10 mm; minimum spacing between adjacent channels at the location of the associated maximum cross dimension of the adjacent channels is maximally 50% of the sum of the associated maximum cross dimensions, preferably maximally 35% of the sum of the associated maximum cross dimensions; dimensions of the channels of the sound-absorbing panel are mutually different; the sound absorbing panel is built up of a number of abutting, preferably glued-together subpanels;
orthe sound-absorbing panel is coated between the open ends with a sound-absorbing material having an absorption coefficient of at least 0.5 for at least part of the frequency range between 20 Hz and 4000 Hz. - View Dependent Claims (2)
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3. A magnetic resonance imaging (MRI) device comprising:
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a diagnostic space, a main magnetic system for generating a main magnetic field in said diagnostic space; a gradient magnetic coil system comprising; a gradient coil for generating at least one gradient of the main magnetic field, and a sound-absorbing panel disposed between the gradient coil and the diagnostic space to reduce noise reducing means for reducing noise that is generated as a result of vibrations of the gradient coil, the sound-absorbing panel including channels having an open end and a closed end, wherein the open ends of at least some of the channels are present on a side of the associated channels that faces, towards the diagnostic space or on a side of the associated channels that faces towards the gradient coil. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A magnetic resonance imaging (MRI) device comprising:
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a diagnostic space; a main magnetic system for generating a main magnetic field in said diagnostic space; a gradient magnetic coil system including; a gradient coil for generating at least one gradient of the main magnetic field, and a sound-absorbing panel disposed between the gradient coil and the diagnostic space, the sound-absorbing panel including channels having an open end and a closed end, a cross dimension of at least a part of the channels on a side of the associated closed ends thereof being different from a cross dimension of a part of the channels on the side of the associated open ends. - View Dependent Claims (12, 13, 14, 15)
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16. A magnetic resonance imaging (MRI) device comprising:
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a diagnostic space; a main magnetic system for generating a main magnetic field in said diagnostic space; a gradient magnetic coil system including; a gradient coil for generating at least one gradient of the main magnetic field, and a sound-absorbing panel disposed between the gradient coil and the diagnostic space to reduce noise that is generated as a result of vibrations of the gradient coil, the sound-absorbing panel including channels having an open end and a closed end, the sound-absorbing panel being provided with a radio frequency transmission coil system for generating and/or receiving a radio frequency signal in the diagnostic space. - View Dependent Claims (17, 18)
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Specification