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Method and device for compensating for magnetic noise fields in spatial volumes, and imaging apparatus for nuclear magnetic resonance.
Method and device for compensating for magnetic noise fields in spatial volumes, and imaging apparatus for nuclear magnetic resonance.
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机译：用于补偿空间体积中的磁噪声场的方法和装置以及用于核磁共振的成像设备。
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摘要
A method for compensating for magnetic noise fields in spatial volumes, the said spatial volume cavity imaging of an MRI apparatus for accommodating the patient's body or part thereof, in a room in which said apparatus is housed, comprising the following steps: determining the power of the magnetic field outside said spatial volume; defining, on a theoretical basis, ie according to the laws of electromagnetism, or on an empirical basis, the correlation between the noise field outside the spatial volume and the corresponding noise field inside the spatial volume, or calculating the field noise inside said spatial volume, from the measurement or measurements of the magnetic field outside said spatial volume; from the magnetic field inside said spatial volume, as it has been determined theoretically or empirically, generating a magnetic compensation field, particularly for neutralizing the noise field in said spatial volume; characterized in that the method further provides separate detection of noise fields with frequencies in the range of at least two different frequency bands, or in three or more different frequency bands, and the determination and / or generation of the corresponding field compensation for all or at least some of the noise fields with frequencies in the range of said at least two, three or more predetermined frequency bands, wherein said compensation field is different for at least some of the noise fields of said at least two frequency bands.
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