Abstract #0577

Field orientation matters: vertical open-bore scanners significantly reduce RF heating around implanted deep brain stimulation devices

Jasmine Vu^1,2, Bhumi Bhusal², Bach T Nguyen², Pia Sanpitak², Elizabeth Nowac³, Julie Pilitsis⁴, Joshua Rosenow⁵, and Laleh Golestanirad^1,2

¹Biomedical Engineering, Northwestern University, Evanston, IL, United States, ²Radiology, Northwestern University, Chicago, IL, United States, ³Illinois Bone and Joint Institute, Wilmette, IL, United States, ⁴Neurosciences & Experimental Therapeutics, Albany Medical College, Albany, NY, United States, ⁵Neurosurgery, Northwestern University, Chicago, IL, United States

Synopsis

Radiofrequency (RF) heating of tissue around active electronic implants limits MRI accessibility for patients with deep brain stimulation (DBS) devices. Here, we show that RF heating had an 11-fold reduction on average for a DBS device with clinically relevant, patient-derived lead trajectories during MRI in a 1.2 T vertical scanner compared to a 1.5 T horizontal scanner. Electromagnetic simulations showed up to a 14-fold decrease in the maximum of the 0.1g-averaged SAR, which was consistent in leads with various internal wire geometries/electrical lengths, suggesting that our experimental results could potentially generalize to DBS devices from other manufacturers.

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