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Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Radiology Safety

Background:

  • Magnetic resonance imaging (MRI) scanners utilize powerful magnetic fields.
  • The behavior of common objects within these fields is not fully understood.
  • Potential projectile risks and tissue penetration by everyday items in MRI environments require investigation.

Purpose of the Study:

  • To assess the projectile risk of common healthcare-related objects in a 3 Tesla (T) MRI scanner.
  • To evaluate the potential for these objects to cause tissue penetration.
  • To understand the safety implications for patients and healthcare professionals.

Main Methods:

  • A prospective in situ experimental study was conducted using a clinical 3 T MRI scanner.
  • A custom rig guided 12 categories of common hospital objects towards the scanner bore.
  • Ballistic gel simulated human tissue for penetration depth assessment, with SANTA measurements recording acceleration.

Main Results:

  • Objects like knives and biscuit tins exhibited high acceleration (152-161 cm) towards the MRI bore.
  • Five objects, including a knife (5.5 cm) and teaspoon (5.0 cm), penetrated ballistic gel.
  • Biscuit tins caused significant impact force, potentially leading to bone fractures; electronic devices remained functional.

Conclusions:

  • Commonly found objects in healthcare settings pose significant projectile and tissue penetration risks within MRI scanners.
  • Unintentional introduction of ferromagnetic objects can lead to severe harm, including tissue damage and bone fractures.
  • Enhanced awareness and strict protocols regarding ferromagnetic objects are essential for MRI safety.