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Abstract #0174

Reduced Heating of Implanted Electrical Conductors Using Parallel Radiofrequency Transmission

Clare McElcheran 1 , Laleh Golestanirad 2 , and Simon Graham 1,2

1 Medical Biophysics, University of Toronto, Toronto, ON, Canada, 2 Sunnybrook Health Science Centre, Toronto, ON, Canada

Deep Brain Stimulation (DBS), a treatment for movement disorders (eg Parkinsons Disease) consists of leads and electrodes that send electrical impulses to deep brain nuclei. During MRI, the electric field (E) created by radiofrequency (RF) excitation couples with the leads, amplifies E, and can cause dangerous heating of nearby tissues. Parallel RF transmission (PTX) is investigated to suppress heating by varying the amplitude and phase of each transmit element. In an 8-element PTX with a uniform cylindrical phantom, E is reduced 97% compared to a linear birdcage transmitter, with <10% transmit magnetic field inhomogeneity in the chosen field of view.

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