Header

UZH-Logo

Maintenance Infos

3-T MRI implant safety: heat induction with new dual-channel radiofrequency transmission technology


Farshad-Amacker, Nadja A; Nanz, Daniel; Thanbanbalasingam, Arjun; Andreisek, Gustav; Nittka, Mathias; Luechinger, Roger (2018). 3-T MRI implant safety: heat induction with new dual-channel radiofrequency transmission technology. European Radiology Experimental, 2(1):7.

Abstract

We aimed to investigate whether different transmission settings of the dual-transmit technology may influence the amount of heat induction around an implant material dependent on its location within the magnetic field. Metallic hip implants were positioned in the magnet of a 3-T scanner at various lateral offset positions in relation to the magnetic axis in a body-phantom tank filled with polyacrylic acid gel. The temperature increase close to the implants was measured during turbo spin-echo scanning using dual-channel parallel radiofrequency (RF) transmission with circular in comparison to elliptic RF polarization. Circularly polarized transmission (CPT) induced higher temperature increases (maximum 6.2 °C) than elliptically polarized transmission (EPT) (maximum 1.5 °C). The heat induction was dependent on the distance to the isocenter with increased heating by increased distance to the isocenter. EPT showed lower heating around implants compared to the CPT as commonly used in single-transmission system; further, less heating was observed for both transmission settings closer to the magnet isocenter.

Abstract

We aimed to investigate whether different transmission settings of the dual-transmit technology may influence the amount of heat induction around an implant material dependent on its location within the magnetic field. Metallic hip implants were positioned in the magnet of a 3-T scanner at various lateral offset positions in relation to the magnetic axis in a body-phantom tank filled with polyacrylic acid gel. The temperature increase close to the implants was measured during turbo spin-echo scanning using dual-channel parallel radiofrequency (RF) transmission with circular in comparison to elliptic RF polarization. Circularly polarized transmission (CPT) induced higher temperature increases (maximum 6.2 °C) than elliptically polarized transmission (EPT) (maximum 1.5 °C). The heat induction was dependent on the distance to the isocenter with increased heating by increased distance to the isocenter. EPT showed lower heating around implants compared to the CPT as commonly used in single-transmission system; further, less heating was observed for both transmission settings closer to the magnet isocenter.

Statistics

Citations

Dimensions.ai Metrics

Altmetrics

Downloads

12 downloads since deposited on 05 Dec 2018
12 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Diagnostic and Interventional Radiology
04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Language:English
Date:2018
Deposited On:05 Dec 2018 14:45
Last Modified:05 Dec 2018 14:48
Publisher:SpringerOpen
ISSN:2509-9280
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1186/s41747-018-0040-y
PubMed ID:29708190

Download

Download PDF  '3-T MRI implant safety: heat induction with new dual-channel radiofrequency transmission technology'.
Preview
Content: Published Version
Filetype: PDF
Size: 622kB
View at publisher
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)