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A magnetic resonance imaging (MRI) system with compartmentalized covers Disclosure Number: IPCOM000012053D
Publication Date: 2003-Apr-04
Document File: 1 page(s) / 20K

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A magnetic resonance imaging (MRI) system with compartmentalized covers

A well known problem of magnetic resonance imaging (MRI) systems is that such systems produce a high level of noise and vibrations. The noise particularly originates from the cryostat of the main magnet system, which generates the main magnetic field in the examination volume of the MRI system, and from the gradient magnet system, which generates the gradients of the main magnetic field. The noise and vibrations are mainly caused by the altering Lorentz forces which are exerted on the coils of the gradient magnet system and on the parts of the cryostat carrying eddy currents.

In order to reduce the radiation of said noise to the surroundings of the MRI system, the cryostat is provided with an additional cover, which substantially completely covers the cryostat wall. Between the cryostat wall and the cover, an air or other gas volume is present. Said volume is compartmentalized into a large number of small compartments. In this manner, unwanted resonances of the air or gas volume, which would increase the noise production of the MRI system, are prevented.

In a particular embodiment, the dimensions of the compartments are such that resonances of the air or gas volume only occur at frequencies above, for example, 2,5 kHz, i.e. above the noise peak frequencies which are characteristic for the MRI system. If the compartments are filled with air, the characteristic dimensions of the compartments should be smal...