Abstract
Since 2005 ferromagnetic detection systems (FMDS) emerged as devices for alerting staff to possible projectile incidents in MRI. Their value was quickly recognized by the advisory panel of the American College of Radiology and was subsequently included in their guidance document as a safety recommendation. We present an overview of FMDS used for MRI safety. Non-discriminating metal detectors and discriminating FMDS are discussed. FMDS have two main applications for MRI safety: Providing a last line of defense against projectile incidents, and providing an objective safety check on patients prior to scanning. Entry control FMDS have the potential for alarm fatigue, but there are approaches to prevent this. Patient screening FMDS can serve to discover any discrepancies between paper screening and reality. They can detect some ferromagnetic implants that require safety considerations in MRI. We conclude that if used in the context of an overall safety plan, FMDS are useful tools.
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