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Acoustic noise in a small-format 3.0-T neonatal MRI system.

Amanda J Neumiller1,2, Kelsey M Murphy1, Hui Wang3

  • 1Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229, USA.

Pediatric Radiology
|October 15, 2024
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Summary

A new neonatal MRI scanner in the NICU is significantly quieter than standard MRI machines. This innovation enhances safety for premature infants and healthcare professionals by reducing acoustic noise during magnetic resonance imaging.

Keywords:
Acoustic noiseHearing safetyMagnetic resonance imagingNeonatal imagingNeonatal intensive care unit

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Area of Science:

  • Medical Imaging
  • Neonatal Care
  • Acoustics

Background:

  • Magnetic resonance imaging (MRI) is underutilized in neonatal care due to logistical and safety challenges.
  • Moving premature infants to radiology departments for MRI is difficult and poses risks.
  • Acoustic noise from MRI scanners presents safety concerns for neonates and staff.

Purpose of the Study:

  • To compare the acoustic noise levels of a novel small-format 3.0-T neonatal MRI scanner with conventional adult-sized 1.5-T and 3.0-T MRI scanners.
  • To evaluate the safety implications of reduced acoustic noise for neonatal patients and healthcare providers.

Main Methods:

  • Sound pressure level (SPL) measurements were conducted using a standard neonatal head imaging protocol.
  • A Brüel & Kjær sound level meter (model 2250) was used for SPL measurements.
  • One-way ANOVA was employed to determine the statistical significance of SPL differences between scanners.

Main Results:

  • The neonatal 3.0-T MRI scanner produced lower A-weighted SPLs compared to adult scanners.
  • At the isocenter, the neonatal scanner was 5.98 dBA quieter than the 1.5-T and 13.89 dBA quieter than the 3.0-T scanner (P<0.001).
  • Near the scanner, the neonatal system was significantly quieter by 19-20 dBA compared to adult systems (P<0.001).

Conclusions:

  • The neonatal 3.0-T MRI system offers a significant reduction in acoustic noise compared to conventional MRI scanners.
  • This quieter system enhances safety for neonatal patients undergoing magnetic resonance imaging.
  • Reduced sound pressure levels also improve the safety environment for clinicians in proximity to the scanner.