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Numerical examinations of simplified spondylodesis models concerning energy absorption in magnetic resonance imaging

  • Metallic implants in magnetic resonance imaging (MRI) are a potential safety risk since the energy absorption may increase temperature of the surrounding tissue. The temperature rise is highly dependent on implant size. Numerical examinations can be used to calculate the energy absorption in terms of the specific absorption rate (SAR) induced by MRI on orthopaedic implants. This research presents the impact of titanium osteosynthesis spine implants, called spondylodesis, deduced by numerical examinations of energy absorption in simplified spondylodesis models placed in 1.5 T and 3.0 T MRI body coils. The implants are modelled along with a spine model consisting of vertebrae and disci intervertebrales thus extending previous investigations [1], [2]. Increased SAR values are observed at the ends of long implants, while at the center SAR is significantly lower. Sufficiently short implants show increased SAR along the complete length of the implant. A careful data analysis reveals that the particular anatomy, i.e. vertebrae and disci intervertebrales, has a significant effect on SAR. On top of SAR profile due to the implant length, considerable SAR variations at small scale are observed, e.g. SAR values at vertebra are higher than at disc positions.

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Author:Nicole Hadert, Qi Liu, Waldemar Zylka
Parent Title (English):Current Directions in Biomedical Engineering
Document Type:Article
Date of Publication (online):2018/12/22
Year of first Publication:2016
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2019/01/11
First Page:653
Last Page:658
Departments / faculties:Fachbereiche / Elektrotechnik und angewandte Naturwissenschaften
Licence (German):License LogoCreative Commons - Namensnennung - Nicht kommerziell - Weitergabe unter gleichen Bedingungen

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