M Ghemame1, C Cathelineau2, J-C Ferré2,3, F Mouriaux4,5, B Carsin-Nicol2, P-A Eliat6, H Saint-Jalmes7. 1. Department of Ophthalmology, Rennes University Hospital, F-35000, Rennes, France. marwane.ghemame@chu-rennes.fr. 2. Department of Neuroradiology, Rennes University Hospital, F-35033, Rennes, France. 3. University of Rennes, Rennes University Hospital, Inria, CNRS, INSERM, IRISA, Empenn ERL U-1228, F-35000, Rennes, France. 4. Department of Ophthalmology, Rennes University Hospital, F-35000, Rennes, France. 5. University of Rennes, INSERM, UMR 1241, Nutrition, Métabolismes et Cancer (NuMeCan), Rennes, France. 6. CNRS, Inserm, BIOSIT- UMS 3480, US_S 018, F-35000, Rennes, France. 7. University of Rennes, Rennes University Hospital, CLCC Eugène Marquis, Inserm, LTSI - UMR 1099, F-35000, Rennes, France.
Abstract
PURPOSE: Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to movement, especially in and around the eyes. Ferromagnetic foreign bodies located in the intraocular area, eyelids, and orbit are thus prohibited from undergoing MRI. The aim of the study was to analyze movement of 4-mm ferromagnetic foreign bodies in MRI in the eye, eyelid, and orbit using computed tomography (CT) scan. METHOD: We developed a porcine model using 12 quarters of fresh porcine heads. Each porcine head included one whole orbit with the ocular globe, orbital fat, muscles, and eyelids. Four-millimeter FFB were implanted in the eye within 2 days post-slaughter, and images were acquired within 5 days post-slaughter. Four-millimeter FFB movement was analyzed after 1.5-Tesla (T) MRI. Four locations were tested: intravitreous, suprachoroidal, intraorbital fat, and intrapalpebral. Movement analysis was assessed using computed tomography (CT) scan. RESULTS: The intravitreous ferromagnetic ball moved 14.0 ± 8.8 mm (p < 0.01), the suprachoroidal ball moved 16.8 ± 5.4 mm (p < 0.01), the intraorbital fat ball moved 5.8 ± 0.9 mm (p > 0.05), and the intrapalpebral ball moved 2.0 ± 0.4 mm (p > 0.05). CONCLUSION: The ex vivo porcine model was able to study FFB movement. The 4-mm ferromagnetic balls moved in intravitreous and in suprachoroidal locations after MRI.
PURPOSE: Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to movement, especially in and around the eyes. Ferromagnetic foreign bodies located in the intraocular area, eyelids, and orbit are thus prohibited from undergoing MRI. The aim of the study was to analyze movement of 4-mm ferromagnetic foreign bodies in MRI in the eye, eyelid, and orbit using computed tomography (CT) scan. METHOD: We developed a porcine model using 12 quarters of fresh porcine heads. Each porcine head included one whole orbit with the ocular globe, orbital fat, muscles, and eyelids. Four-millimeter FFB were implanted in the eye within 2 days post-slaughter, and images were acquired within 5 days post-slaughter. Four-millimeter FFB movement was analyzed after 1.5-Tesla (T) MRI. Four locations were tested: intravitreous, suprachoroidal, intraorbital fat, and intrapalpebral. Movement analysis was assessed using computed tomography (CT) scan. RESULTS: The intravitreous ferromagnetic ball moved 14.0 ± 8.8 mm (p < 0.01), the suprachoroidal ball moved 16.8 ± 5.4 mm (p < 0.01), the intraorbital fat ball moved 5.8 ± 0.9 mm (p > 0.05), and the intrapalpebral ball moved 2.0 ± 0.4 mm (p > 0.05). CONCLUSION: The ex vivo porcine model was able to study FFB movement. The 4-mm ferromagnetic balls moved in intravitreous and in suprachoroidal locations after MRI.
Authors: Ivan Fernandez-Bueno; Jose Carlos Pastor; Manuel Jose Gayoso; Ignacio Alcalde; Maria Teresa Garcia Journal: Mol Vis Date: 2008-11-28 Impact factor: 2.367