Abstract #0550

Percentage of change in the calculated SAR values in human head during 3T MRI of patients with deep brain stimulation implants: A computational study of realistic vs. simplified lead trajectories

Laleh Golestanirad¹, Maria Ida Iacono², Leonardo M Angelone², and Giorgio Bonmassar¹

¹Radiology, Massachusetts General Hospital, Charlestown, MA, United States, ²Division of Biomedical Physics, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD, United States

Each year approximately 300,000 patients with medical implants including deep brain stimulation (DBS) devices are denied magnetic resonance imaging (MRI) examination due to safety concerns. One of the major contraindications of MRI for DBS patient population is due to the potential for permanent injuries from excessive tissue heating. One open question when evaluating RF-induced heating with DBS is the effect of the lead path and the need for patient-specific information. Using finite element method, we report results of calculated SAR maps for patient-specific lead paths based on CT images, and compare them to simplified path trajectories.

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