What is the "zone system" in MRI safety?

The zone system in MRI safety is a stratification approach that divides the MRI environment into distinct areas, each designated with its own level of access and required safety protocols. This system is critical for ensuring the safety of patients, staff, and visitors within the MRI facility.

The zones typically range from Zone I, which is freely accessible to the public, to Zone IV, the magnet room itself, where strict access controls are implemented due to the presence of the powerful magnetic field and potential hazards. Each zone has specific guidelines regarding who can enter, what safety measures must be in place, and how to respond to emergencies. This structured approach helps prevent accidents, such as unauthorized access to the magnet area or the introduction of ferromagnetic objects, which could pose serious risks.

In contrast, methods for testing machine functionality or protocols for transmitting data to other departments do not relate to safety protocols or access control within the MRI environment. Similarly, the guidelines for commercial MRI systems do not encompass the comprehensive safety framework that the zone system provides for all MRI facilities.