Structural-Acoustic Analysis, Identification and Control of a 4T MRI Scanner
Lee J, Li M, Lim T, Holland C, Boyce S
University of Cincinnati, University of Cincinnati
A series of experiments were conducted at 4T to identify the major acoustic noise sources and their contributions to sound pressure levels. Quantification of a set of generalized impulse response functions (IRFs) can be applied to synthesize the actual operating response for any given gradient excitations. Temporal and spectral analysis of the data reveals the existence of harmonics, non-harmonics and broadband characteristics, which can be accurately synthesized through the IRFs. These should be useful in guiding the development of a suitable active noise control (ANC) system. The preliminary ANC simulation demonstrates that at least 20 dB noise reductions are achievable.