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      Electromagnetic Techniques to Minimize the Risk of Hazardous Local Heating around Medical Implant Electrodes during MRI Scanning

      McCabe, Steven Owen; Scott, Jonathan B.; Butler, Stephen
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      McCabeScott_EuMW2015.pdf
      Accepted version, 1.526Mb
      DOI
       10.1109/EuMC.2015.7345860
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      McCabe, S. O., Scott, J. B., & Butler, S. (2015). Electromagnetic Techniques to Minimize the Risk of Hazardous Local Heating around Medical Implant Electrodes during MRI Scanning. In Proceedings of 2015 European Microwave Conference(EuMC) (pp. 702–705). Conference held in Paris, France. http://doi.org/10.1109/EuMC.2015.7345860
      Permanent Research Commons link: https://hdl.handle.net/10289/9845
      Abstract
      Magnetic Resonance Imaging (MRI) scans are contraindicated for many patients with medical implants. We establish the circumstances that cause, and the resistances required to ameliorate and to eliminate dangerous levels of MRI-induced heating that occur at the exposed, distal end of an electrical lead implanted in tissue. Simulated predictions are compared with measurements made at 128 MHz in a 3-Tesla MRI machine. A low resistance at kilohertz frequencies is sought by implant makers, in contrast with the high resistance demanded for safety. The practicality of presently-developed strategies to prevent tissue damage is brought into question. We examine the extent to which skin-depth and transmission-line properties can be manipulated to improve safety.
      Date
      2015
      Type
      Conference Contribution
      Rights
      Copyright © EuMC 2015.
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      • Science and Engineering Papers [3122]
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