Modeling of RF heating due to metal implants in MRI

Author

Yeung, Christopher J. ; Susil, Robert C. ; Atalar, Ergin

Author_Institution

Dept. of Biomed. Eng., Johns Hopkins Univ., Baltimore, MD, USA

Volume

1

fYear

2002

fDate

2002

Firstpage

823

Abstract

Metal implants, even if non-ferromagnetic, may couple with the radiofrequency (RF) electromagnetic field used in magnetic resonance imaging (MRI) and cause a heating hazard. With the development of MRI as a tool for image-guided surgery, metal devices (e.g. guidewires) are being used in patients during MRI scans. This paper reviews the electromagnetic and bioheat transfer methods we have used to evaluate the safety of metal devices in MRI with respect to RF heating. We recommend updated regulatory guidelines to deal with the highly localized heating encountered with metal implants. We also recommend the use of the safety index as a useful measure of the RF safety of a device.

Keywords

biological effects of radiation; biomedical MRI; biothermics; legislation; prosthetics; radiofrequency heating; safety; surgery; MRI; RF heating; bioheat transfer methods; electromagnetic methods; image-guided surgery; magnetic resonance imaging; metal implants; regulatory guidelines; safety index; Electromagnetic coupling; Electromagnetic devices; Electromagnetic fields; Electromagnetic heating; Hazards; Implants; Magnetic resonance imaging; Radio frequency; Safety devices; Surgery;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2002. IEEE

Print_ISBN

0-7803-7330-8

Type

conf

DOI

10.1109/APS.2002.1016469

Filename

1016469