An Efficient Method to Mitigate RF-induced Heating in DBS patient at 7T Using Geometrically Adjustable RF Head Array.

Motivation: Patients with deep brain stimulation (DBS) devices are strictly prohibited from undergoing 7 Tesla magnetic resonance imaging (MRI) scans. Goal(s): Mitigating radiofrequency (RF)-induced heating in DBS for 7 T MRI using a convenient approach. Approach: By utilizing the electromagnetic characteristics arising from the near-field region of the RF coil, a novel method of rearranging the positions of the RF channels adjacent to the DBS lead using a geometrically adjustable RF array was proposed. Results: Adjusting the position of channels adjacent to lead reduces the specific absorption rate and the extent of temperature increase around the electrode up to 34% and 23.8 %, respectively. Impact: Our method involves strategically adjusting the position of RF coil near the lead, providing a practical solution to mitigate RF-induced heating in DBS. It eliminates the necessity for a new lead design or complex numerical optimization for incident electromagnetic field.