In-room imaging and MR planning

Proximity Limits

> 30 G Stainless steel, non- ferromagnetic objects < 30 G ECG monitors, unrestrained ferromagnetic objects < 10 G Credit cards, x-ray tubes < 5 G Pacemakers, general public < 3 G Moving cars etc

• Each scanner has its ‘footprint’ • ‘5 Gauss line’ (0.5 mT) should be confined to scan room • Radial & axial components Typically axial 1.6 times larger • May be measured with handheld gaussmeter

< 1 G TVs, CT & PET scanners

< 0.5 G Railways, gamma cameras