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Survey of Acoustic Output in Neonatal Brain Protocols
Hannah R Kurdila1, Tayeb Zaidi2, Ting Zhang3
1Division of Applied Mechanics, Food and Drug Administration, Center for Devices and Radiological Health, Silver Spring, Maryland, USA.
Journal of Magnetic Resonance Imaging : JMRI
|May 4, 2021
Summary
Neonatal MRI scans produce sound levels that may cause non-auditory responses in infants. While not exceeding safety limits, these acoustic exposures warrant further investigation for neonatal hearing safety.
Area of Science:
- Medical Imaging
- Acoustics
- Neonatal Health
Background:
- Neonatal magnetic resonance imaging (MRI) procedures generate significant sound levels, raising auditory and non-auditory safety concerns.
- Existing knowledge gaps hinder a comprehensive risk assessment for neonates undergoing MRI.
Purpose of the Study:
- To quantify acoustic exposure, including duration, intensity, and frequency, during neonatal brain MRI.
- To compare measured acoustic values against established hearing safety limits and relevant infant response data.
Main Methods:
- Acoustic measurements (Sound Pressure Levels, frequency, duration) were conducted on five MRI scanners (1-3 Tesla) using neonatal brain protocols.
- Data were collected from three different sites, including a dedicated neonatal scanner.
- Statistical analysis, including the Mann-Whitney U test, was used to compare sound levels, particularly between the dedicated neonatal scanner and others.
Main Results:
- The average A-weighted equivalent sound level (LAEQ) across all scanners and scans was 92.88 dBA, with a range of 80.8-105.31 dBA.
- Neonatal MRI protocol durations ranged from approximately 27 to 37 minutes.
- Sound levels during neonatal MRI protocols exceeded thresholds known to elicit non-auditory responses in neonates.
Conclusions:
- Neonatal MRI acoustic exposure levels present a complex risk profile, exceeding some established thresholds for infant responses.
- While not surpassing the International Electrotechnical Commission (IEC) MRI sound pressure level safety limit, the findings highlight potential risks.
- Further research is needed to fully understand and mitigate the impact of acoustic exposure during neonatal MRI.
