Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Middle ear prosthesis displacement in high-strength magnetic fields
Autore:
Williams, MD; Antonelli, PJ; Williams, LS; Moorhead, JE;
Indirizzi:
Univ Florida, Dept Otolaryngol, Gainesville, FL 32610 USA Univ Florida Gainesville FL USA 32610 laryngol, Gainesville, FL 32610 USA Univ Florida, Dept Radiol, Gainesville, FL 32610 USA Univ Florida Gainesville FL USA 32610 t Radiol, Gainesville, FL 32610 USA Univ Florida, Dept Biostat, Gainesville, FL 32610 USA Univ Florida Gainesville FL USA 32610 Biostat, Gainesville, FL 32610 USA
Titolo Testata:
OTOLOGY & NEUROTOLOGY
fascicolo: 2, volume: 22, anno: 2001,
pagine: 158 - 161
SICI:
1531-7129(200103)22:2<158:MEPDIH>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESONANCE-IMAGING FIELDS; ANEURYSM CLIPS;
Keywords:
middle ear prosthesis; stapes prosthesis; magnetic fields; magnetic resonance imaging; safety;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Antonelli, PJ Univ Florida, Dept Otolaryngol, Box 100264,1600 SW Archer Rd, Gainesville,FL 32610 USA Univ Florida Box 100264,1600 SW Archer Rd Gainesville FL USA 32610
Citazione:
M.D. Williams et al., "Middle ear prosthesis displacement in high-strength magnetic fields", OTOL NEURO, 22(2), 2001, pp. 158-161

Abstract

Hypothesis: Middle ear prostheses made from nonmagnetic, magnetic resonance (MR)-compatible metals reportedly displace ex vivo in the presence of high magnetic fields used in MR imaging (MRI). The authors postulate that the prosthesis displacement seen with "nonmagnetic" MR-compatible prostheses exvivo may not be clinically significant in vivo. Methods: Middle ear prostheses made from ferromagnetic (420F stainless steel) and nonmagnetic MR-compatible metals (316L stainless steel and platinum) were examined for magnetic field interactions at 4.7 Tesla (T). Ex vivo testing consisted of measurements of the translational and rotational motionof the prosthesis induced by the static magnetic field. In vivo testing was assessed by implanting prostheses in cadaveric temporal bones and performing clinical MRI sequences. Prosthesis displacement was measured semiquantitatively. Results: Anular deflection was observed in all samples made from nonmagnetic stainless steel. The negative control (platinum) demonstrated no deflection, and the positive controls (ferromagnetic stainless steel) deflected >90 degrees, Torque analysis showed movement in five of five nonmagnetic stainless steel prostheses. Prostheses made from nonmagnetic stainless steel remained in place without appreciable loosening in vivo after MRI. Prosthesesmade with known ferromagnetic properties were displaced at 4.7 T but not at 1.5 T. Conclusion: Middle ear prostheses made from low-magnetic stainless steel do move in the presence of high magnetic fields ex vivo; however, this does not appear to be clinically or statistically significant in vivo at 4.7 T. Magnetic resonance imaging should be undertaken with caution in individualswith prostheses made from stainless steel with strong ferromagnetic properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/02/20 alle ore 18:04:21