Effect of a 1.5 Tesla Magnetic Field on Greenfield Filters in Vitro and in Dogs

Williamson, Michael R.; McCowan, Timothy C.; Walker, Craig W.; Ferris, Ernest J.
December 1988
Angiology;Dec1988, Vol. 39 Issue 12, p1022
Academic Journal
The authors have tested four Greenfield filters for deflection in a 1.5 Tesla magnetic field and found large variations in the amount of deflection among filters. They also placed two filters in dogs and checked the filter for migration by taking radiographs before and after magnetic resonance imaging (MRI) scans. They found no evidence of migration. They conclude that, while most Greenfield filters respond to a magnetic field, the chance of migration of a filter because of an MRI scan is small. Therefore, MRI scanning of patients with Greenfield filters has little risk.


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