T. Miyati et al., Acoustic noise analysis in echo planar imaging: Multicenter trial and comparison with other pulse sequences, IEEE MED IM, 18(8), 1999, pp. 733-736
Citations number
14
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Eletrical & Eletronics Engineeing
The purpose of this study was to evaluate acoustic noise in echo planar ima
ging (EPI) at various magnetic resonance imaging (MRI) centers and to compa
re EPI acoustic noise with that in other fast pulse sequences. We measured
A-weighted root-mean-square sound pressure Levels and peak impulse sound pr
essure levels for EPI, under the same conditions, in eleven clinical super-
conducting MRI systems. We also compared sound pressure levels for the EPI
and six different pulse sequences and analyzed the acoustic noise spectra.
Sound pressure levels during the use of the EPI differed greatly among inst
itutions. Moreover, sound pressure levels of the EPI were not significantly
different from those of other fast pulse sequences and were within permiss
ible noise exposure levels. In comparison to other fast sequences, the EPI
had significantly greater acoustic noise in the high-octave band frequency.