Characterization of Noise Produced During Continuous and Sparse Sampling Functional Magnetic Resonance Imaging
AbstractNoise is generated during magnetic resonance imaging (MRI) and comes from the gradient magnetic field (Lorentz forces acting on the gradient coils) and radiofrequency pulses used to generate sequences for scanning. Characterizing this noise is complicated by the fact that sensors without any metal parts must be used, given the intense magnetic fields present in MRI. Also, the typical continuous acquisition scheme that generates continuous noise is hardly compatible with auditory-related experiments. To avoid noise during stimulus presentation, sparse samplingfunctional MRI has been suggested and involve theacquisition of imaging volumes interspersed with silent periods (i.e. no acquisition periods).This communication describes the use of optical fiber microphones to characterize the noise produced during continuous and sparse sampling functional magnetic resonance imaging sequences. The whole instrumentation chain is described, along with the results obtained in terms of overall sound pressure level and time-frequency content.
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