Which of the following metals is less likely to cause interference in an MR environment?

Austenitic metals are indeed less likely to cause interference in an MR environment due to their specific composition and properties. Austenitic stainless steels, which are rich in nickel and chromium, exhibit non-magnetic properties or very low magnetic permeability compared to other types of steel. This characteristic minimizes the risk of magnetic interference or the potential for ferromagnetic attraction, which can pose safety hazards in MR environments.

In contrast, martensitic and ferritic steels can be more magnetic, leading to a greater chance of interference with the MR system. Martensitic steels, which can exhibit varying levels of magnetism depending on their structure, may experience some attraction to magnets. Ferritic steels are generally magnetic and can strongly interact with magnetic fields, causing notable interference and safety risks in an MRI setting.

Highly ferrous metals, characterized by their high iron content, are predominantly magnetic and can significantly interfere with MR imaging. Their strong attraction to the magnetic field can disrupt the operation of the MRI equipment and pose danger to patients and staff.

Given these properties, austenitic metals are specifically designed for reduced magnetic interactions, making them the safest choice in an MR environment.