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Abstract #4177

Effect of device configuration and patient’s body composition on RF heating of deep brain stimulation (DBS) implants  during MRI

Bhumi Bhusal1, Joshua Rosenow2, Bach Nguyen1, Jasmine Vu1, Noah Pasquinelli1, and Laleh Golestanirad1
1Northwestern University, Chicago, IL, United States, 2Northwestern Medicine, Chicago, IL, United States

Off-label use of MRI in patients with DBS implants has been reported at 3T, relying only on safety tests in ASTM phantoms and with limited configurations. We constructed a multi-compartment anthropomorphic phantom consisting of brain, skull and body tissue, and measured RF heating of a fully implanted DBS system with various configurations during MRI at 1.5T. We found an 89-fold variation in RF heating depending on DBS device configuration. Simulating subcutaneous fat (as happens in obese patients) by adding a thin layer of oil to cover the upper face of the IPG increased RF heating by 3-fold in some configurations.

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