The effects of exposure to a 1.5-tesla magnetic field on intravitreous metallic foreign bodies in rabbits

Abstract

(1) Angle measurements show that MFBs are significantly mobile when exposed to a 1.5-T magnetic field on the same day as FB implantation and 30 days later. (2) Angular mobility of MFBs is less at 30 days. (3) Magnetic field exposure did not induce ocular injury in MFB-containing globes. (4) Intravitreous metallic FB retention induces ocular pathologic changes.

Undetected intraocular metallic foreign body causing hyphema in a patient undergoing MRI: a rare occurrence demonstrating the limitations of pre-MRI safety screening

“…After the initial case report by Kelly et al, there were several studies performed to determine the effect of MRI on IMFBs, both in vivo and in vitro [4][5][6][7][8]. Some of the early studies were performed at low field strength, including a study by Kelsey et al that was performed at 0.06 T, in which the authors implanted ferromagnetic fragments from 0.25 to 2.2 mm in the vitreous humor of explanted bovine and leporine eyes and determined that the fragments did not significantly move [6].…”

Ex vivo porcine model for eye, eyelid, and orbit movement analysis of 4-mm ferromagnetic foreign bodies in MRI

“…Then, they dissected bovine eyes to detect movement after 1.0 T MRI and concluded that iron, chromium, and solder foreign bodies had changed their position in these bovine eyes. A more recent study was conducted by Cullen et al 7 in 2002 using twenty rabbits under anesthesia with 1.5 T MRI. They used a 3 mm × 0.72 mm section of a stylet from a 22-gauge spinal needle located in the vitreous.…”