[CCoE Notice] PhD Dissertation Announcement

[Grayson, Audrey A]

PhD Dissertation Announcement

NUMERICAL AND EXPERIMENTAL STUDY OF PACEMAKER SAFETY UNDER MRI

Shi Feng

Date: November 5th 2014

Place: ECE conference room

Time: 10:00 am ~ 12:30 pm

Committee Chair:       Dr. Ji Chen

Committee Members:
Dr. Donald Wilton
Dr. David Jackson
Dr. Wolfgang Kainz
Dr. George Zouridakis


Pacemaker safety issues with MRI (Magnetic Resonance Imaging) are discussed in this thesis. In order to analyze the electromagnetic compatibility issue of pacemaker/defibrillator with MRI RF (radio frequency) coil and human body model, novel techniques for evaluation of MRI-induced heating or induced voltage in the vicinity of implanted metallic lead is developed. The technique is based on the reciprocity theorem. By using this technique, one can decouple the micro-scale metallic lead from the macro-level phantom or human simulations within the MRI RF-coil. Consequently, it is very efficient to estimate the MRI-induced heating at the leads tip end and the induced voltage on the pacemaker device CAN even if the lead structure dimension is in sub-millimeter order. The measurement configurations are descried in details. The technique is validated in both numerical and experimental studies on different lead structures. More than one hundred transfer functions of real practical pacemakers have been measured. Hundreds validation tests are performed on those transfer functions. In addition, effect of human body/phantom is discussed. Based on the measured transfer functions and human body simulations, some safety analysis is made.
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