A numerical study is performed to translate the MRI induced ex-vivo heating in a stent measured in tissue mimicking gel phantoms to heating in vivo. The in vivo heating was simulated by solving the convective energy equation in a tissue perfused with a single blood vessel embedded with a stent. Appropriate power density function was determined by matching the ex-vivo heating results in the tissue with no blood flow. The effect of the blood flow on the in vivo heating was investigated by varying the flow. Results show that ≥3% of normal, mean physiologic flow in the blood vessel reduces the maximum temperature change to < 3 °C from ∼10 °C measured ex vivo for an MRI scan of ≤ 15 minutes. Local temperature change of up to 3 °C in the trunk is considered safe by the regulatory bodies. Also, the maximum temperature change was found to be ∼1 cm away from the stent ends — and not at the stent ends.
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ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation
September 11–13, 2013
Washington, DC, USA
Conference Sponsors:
- Bioengineering Division
ISBN:
978-0-7918-5600-0
PROCEEDINGS PAPER
MRI Induced Heating in a Stent: Translating Measured Ex-Vivo Heating Results to In Vivo Heating
Rachana Visaria,
Rachana Visaria
In Vivo Temperatures, LLC, Roseville, MN
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Devashish Shrivastava
Devashish Shrivastava
University of Minnesota, Minneapolis, MN
Search for other works by this author on:
Rachana Visaria
In Vivo Temperatures, LLC, Roseville, MN
Devashish Shrivastava
University of Minnesota, Minneapolis, MN
Paper No:
FMD2013-16142, V001T10A037; 2 pages
Published Online:
February 19, 2014
Citation
Visaria, R, & Shrivastava, D. "MRI Induced Heating in a Stent: Translating Measured Ex-Vivo Heating Results to In Vivo Heating." Proceedings of the ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation. ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation. Washington, DC, USA. September 11–13, 2013. V001T10A037. ASME. https://doi.org/10.1115/FMD2013-16142
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