Exposure of Infants to Gradient Fields in a Baby MRI Scanner

Authors: Fangfang Tang, Luca Giaccone, Jiahao Hao, Fabio Freschi, Tongning Wu, Stuart Crozier, Feng Liu

Year: 2022 Feb

Category: Bioelectromagnetics

Journal: Bioelectromagnetics

DOI: 10.1002/bem.22387

URL: https://pubmed.ncbi.nlm.nih.gov/35005795/

Abstract

Overview

In pediatric magnetic resonance imaging (MRI), rapid and time-varying gradient magnetic fields surround infants, leading to measurable electric fields induced in their bodies. This presents potential safety risks, such as peripheral nerve stimulation.

Findings

  • The study numerically evaluated in situ electric fields induced in an 8-week-old infant model by specially designed small-sized gradient coils in a 1.5 T MRI baby scanner.
  • Magnetic flux density and electric fields were computed using scalar potential finite differences for multiple coil configurations and positions within the scanner.
  • Electric field inductions in most tissues exceeded the basic restrictions suggested by ICNIRP 2010 guidelines, indicating significant EMF exposure and potential health risks.
  • Positioning of the baby inside the scanner notably affected the profiles of induced electric fields.

Conclusion

The simulations provide valuable insights into the safety limits and the potential risk excess in infant MRI procedures, highlighting an urgent need for guidelines tailored to infant exposure scenarios.

MRI Safety Pediatric Imaging EMF Exposure Infant Health Gradient Coils Electromagnetic Fields
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