English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Influence of metallic shielding on radio frequency energy-induced heating of leads with straight and helical wires: A numerical case study

Kozlov, M., Kainz, W., & Daniel, L. (2020). Influence of metallic shielding on radio frequency energy-induced heating of leads with straight and helical wires: A numerical case study. IEEE Transactions on Microwave Theory and Techniques, 68(2), 509 -515. doi:10.1109/TMTT.2019.2963672.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0005-8A26-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-B826-1
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Kozlov, Mikhail1, Author              
Kainz, Wolfgang2, Author
Daniel, Luca 3, Author
Affiliations:
1Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_2205649              
2Division of Biomedical Physics, Office of Science and Engineering Laboratories, Silver Spring, MD, ou_persistent22              
3Massachusetts Institute of Technology, Cambridge, MA, ou_persistent22              

Content

show
hide
Free keywords: Active implantable medical devices (AIMDs); biomedical applications; electromagnetic (EM) modeling; EM shielding; radio frequency (RF) heating; RF safety; transfer functions (TFs).
 Abstract: Heating induced by radio frequency (RF) energy may appear in tissues near implants located in a human subject undergoing magnetic resonance imaging examination. Lead shielding was proposed to reduce such heating below dangerous levels. In this article, we employed 3-D electromagnetic (EM) and thermal co-simulations to quantify the effectiveness of metallic shielding in the presence of two large sets of nonuniform incident fields at 128 MHz. Specifically, we used a lead EM model (LEM) and computed the RF responses, i.e., the net dissipated power and net temperature increase, above background, at the electrodes. We considered a set of single electrode leads with both straight and helical wires, comparing regular unshielded configurations to different implementations of a metallic shield. The lead length, the relative permittivity of the insulator material, and the lead electrode geometry were all independently varied. For leads with helical wires we observed that: 1) the metallic shield significantly modified the LEM; 2) in most cases, the RF responses substantially increased if metallic shielding was applied; and 3) the net temperature increase in close proximity to the shield can be substantially higher than the net temperature increase in close proximity to the lead electrode. Leads with helical and straight wires exhibited significantly different behavior. Using the results obtained from generic straight wire leads to predict the results for leads with helical wires can be significantly misleading.

Details

show
hide
Language(s): eng - English
 Dates: 2019-11-022019-06-302019-12-222020-01-212020-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1109/TMTT.2019.2963672
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: IEEE Transactions on Microwave Theory and Techniques
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: New York, NY : IEEE
Pages: - Volume / Issue: 68 (2) Sequence Number: - Start / End Page: 509 - 515 Identifier: ISSN: 0018-9480
CoNE: https://pure.mpg.de/cone/journals/resource/991042742035570