Which of the following is not considered an MR safe item?

Devices containing iron are not considered MR safe items because iron is ferromagnetic. Ferromagnetic materials can experience strong attractive forces in the presence of a magnetic field generated by an MRI machine. This attraction can pose significant hazards, including the risk of projectiles that could cause injury to patients or personnel. Additionally, the presence of iron-containing devices can interfere with the quality of the MR images due to magnetic susceptibility effects or even cause malfunctions of the MRI equipment itself.

In contrast, plastic items, stainless steel surgical tools, and non-magnetic clothing are generally considered MR safe. While stainless steel is not completely non-magnetic, many types are classified as non-ferromagnetic, making them less likely to pose dangers in an MRI environment. Non-magnetic clothing and plastic items do not interact with the magnetic field in a way that would compromise safety, making them suitable for use in or near the MRI area.