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Related Concept Videos

Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Updated: Mar 20, 2026

Functional Magnetic Resonance Spectroscopy at 7 T in the Rat Barrel Cortex During Whisker Activation
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Dual hearing protection effectively preserves outer hair cell function during 7 T MRI.

L Wennberg1, S Waechter2, K J Brännström2

  • 1Department of Medical Imaging and Physiology, Skåne University Hospital, Lund, Sweden; Department of Clinical Sciences Lund/ Diagnostic Radiology, Faculty of Medicine, Lund University, Lund, Sweden.

Radiography (London, England : 1995)
|March 18, 2026
PubMed
Summary

Dual hearing protection effectively safeguards outer hair cell function during 7 Tesla (T) MRI noise exposure. This study confirms that using earplugs and impression paste prevents cochlear damage in healthy adults undergoing repeated scans.

Keywords:
Excessive noiseHearingHearing protective deviceMagnetic resonance imagingNoiseNoise exposure

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Area of Science:

  • Audiology
  • Medical Imaging
  • Neuroscience

Background:

  • High acoustic noise from 7 Tesla (T) Magnetic Resonance Imaging (MRI) poses a risk to auditory function.
  • Outer hair cell function is a key indicator of cochlear health and sensitivity to noise damage.

Purpose of the Study:

  • To evaluate the impact of 7 T MRI noise on outer hair cell function in healthy adults.
  • To assess the efficacy of a dual hearing protection strategy.

Main Methods:

  • 39 healthy adults participated in a within-subjects longitudinal study.
  • Outer hair cell function was measured using distortion product otoacoustic emissions (DPOAEs).
  • Participants underwent two 7 T MRI sessions with dual hearing protection (earplugs and impression paste), with DPOAEs measured pre- and post-scan.

Main Results:

  • No significant changes in DPOAEs were observed, indicating stable cochlear function.
  • Outer hair cell function remained unaffected by repeated exposure to 7 T MRI noise.

Conclusions:

  • Adequate dual hearing protection effectively prevents adverse effects on outer hair cell function during 7 T MRI.
  • Rigorous hearing protection is crucial for auditory safety in ultra-high-field MRI settings.
  • Combining foam earplugs with sound-absorbing impression paste is a recommended practice for MRI auditory protection.