Noise in magnetic resonance imaging: no risk for sensorineural function but increased amplitude variability of otoacoustic emissions.

Objectives: Objectives were to perform exact measurements of the noise exposure in a magnetic resonance imager and to investigate the effects of magnetic resonance imaging (MRI) noise on hearing sensitivity, which are still controversial, in a large number of patients.

Study Design: Prospective trial.

Methods: Acoustic noise during seven different MRI sequences was measured using a custom-made microphone containing no ferromagnetic parts.