E-field Comparison of 1.5T Transmit Head and Extremity Coils to 1.5T Body Coils – Implications for Implantable Cardiac Pacemaker and Defibrillator RF Heating and Unintended Stimulation
Shiloh Sison1, Xin Huang2, Shi Feng3, Ji Chen2, Richard Williamson3, and Gabriel Mouchawar3
1St. Jude Medical, Sunnyvale, CA, United States, 2University of Houston, Houston, TX, United States, 3St. Jude Medical, Sylmar, CA, United States
E-fields tangential to implantable cardiac pacemakers and defibrillators
were analyzed at Normal and First Level Controlled Operating Modes as well as
30uT peak B1+. 1.5T body transmit and head and extremity transmit RF coils were
simulated. A comparison of the Etans generated by the body transmit coils is
made to those generated by head and extremity transmit coils. If RF heating and
voltage can be shown to be safe with unrestricted body coils then no additional
analysis is necessary for head and extremity coils since there is a 9x margin
in RF heating and 3x margin in voltage.
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