In MRI safety, the '5 Gauss line' is significant because it marks the boundary beyond which:

• A The specific absorption rate (SAR) exceeds regulatory limits
• B Gradient-induced peripheral nerve stimulation occurs
• C The radiofrequency pulses cause tissue heating
• D Ferromagnetic objects become projectile hazards and pacemakers may malfunction ✓

Explanation

The 5 Gauss (0.5 mT) line defines the controlled access zone. Beyond this line, the static magnetic field is strong enough to attract ferromagnetic objects with dangerous force and can interfere with implanted cardiac pacemakers and other electronic devices. Access beyond this line is restricted to MRI-conditional or non-ferromagnetic equipment only. This is a core MRI safety concept.

Reference: Westbrook, MRI in Practice, 5th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.