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Titolo:
Vibratory sample magnetometry of middle ear prostheses and manufacturing materials
Autore:
Syms, MJ; Peterman, DW;
Indirizzi:
House Ear Clin, Los Angeles, CA 90057 USA House Ear Clin Los Angeles CA USA 90057 r Clin, Los Angeles, CA 90057 USA 2 LDJ Elect Inc, Troy, MI USA 2 LDJ Elect Inc Troy MI USA2 LDJ Elect Inc, Troy, MI USA
Titolo Testata:
OTOLOGY & NEUROTOLOGY
fascicolo: 4, volume: 22, anno: 2001,
pagine: 487 - 491
SICI:
1531-7129(200107)22:4<487:VSMOME>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESONANCE-IMAGING FIELDS; FERROMAGNETISM; ARTIFACTS; IMPLANTS;
Keywords:
middle ear prostheses; magnetic resonance imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Syms, MJ House Ear Clin, 2100 W 3rd St,2nd Floor, Los Angeles, CA 90057 USA House Ear Clin 2100 W 3rd St,2nd Floor Los Angeles CA USA 90057 A
Citazione:
M.J. Syms e D.W. Peterman, "Vibratory sample magnetometry of middle ear prostheses and manufacturing materials", OTOL NEURO, 22(4), 2001, pp. 487-491

Abstract

Objective: To assess the magnetic properties of stapes prostheses and manufacturing materials using a vibratory sample magnetometer (VSM). Data Sources: VSM was performed on 16 samples, including ferromagnetic 420F stainless steel, with an LDJ Model 9600 VSM in accordance with American Society for Testing and Materials standard AS94. Results: A VSM measures the magnetic dipole moment of a sample in a magnetic field. The magnetic field is swept over a range of magnetic fields, and the magnetic dipole moment is plotted as a function of field. The prostheses made of 316L stainless steel previously found to be ferromagnetic had thehighest specific magnetic moments. The specific magnetic moments ranged from 0.023 electromagnetic units (emu)/g to 156 emu/g. The samples made with 316L, stainless steel, which is used in otologic implants, were significantly less magnetic than was the 420F stainless steel. Conclusion: VSM demonstrates that prostheses made with 316L stainless steel are relatively nonferromagnetic compared with 420F stainless steel. However, none of the implants are nonmagnetic. The torque and linear force on the prosthesis is a concern. The safety of performing MRI on patients with these implants needs to be further assessed.

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Documento generato il 29/01/20 alle ore 18:53:25