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A Numerical Investigation of RF Heating Effects on Implants During MRI Compared to Experimental Measurements

  • Jens Stenschke
  • Dan Li
  • Maike Thomann
  • Gregor Schaefers
  • Waldemar Zylka
Part of the Springer Proceedings in Physics book series (SPPHY, volume 114)

Abstract

A numerical model was developed to examine relationships between energy absorption rate (SAR) and temperature distributions in of a phantom containing a hip prostheses implant during radio frequency deposition in MRI. Calculations of SAR and the resulting temperature increases were performed for different frequencies, i.e. B0 values of 1T, 1.5T, and 3.0T. Experimental measurements at B0=1.5T are compared to the numerical results yielding good qualitative agreement. Attempts to ensure RF safety in MRI often rely on assumptions about local temperature from local SAR levels. In case of patients with implants calculations of temperature may be preferable to calculations of SAR because of the more direct relationship between temperature and safety.

Keywords

Energy Deposition Medical Engineer Human Body Model Polystyrene Block Energy Absorption Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Jens Stenschke
    • 1
    • 2
  • Dan Li
    • 1
  • Maike Thomann
    • 1
  • Gregor Schaefers
    • 3
  • Waldemar Zylka
    • 1
  1. 1.Department Physical EngineeringUniversity of Applied Sciences GelsenkirchenGelsenkirchenGermany
  2. 2.Siemens AG Medical SolutionsErlangenGermany
  3. 3.mr:comp GmbHGelsenkirchen

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