Parallel transmission to reduce absorbed power around deep brain stimulation devices in MRI: Impact of number and arrangement of transmit channels.

ABSTRACT:

Purpose

To assess the mean and variance performance of parallel transmission (pTx) coils for reduction of the absorbed power around electrodes (APAE) in patients implanted with deep brain stimulation (DBS) devices.

Methods

We simulated 4 pTx coils (8 and 16 channels, head and body coils) and a birdcage body coil. We characterized the RF safety risk using the APAE, which is the integral of the deposited power (in Watts) in a small cylindrical volume of brain tissue surrounding the electrode tips. We assessed the APAE mean and variance by simulation of 5 realistic DBS patient models that include the full DBS implant length, extracranial loops, and implanted pulse generator.

Results

PTx coils with 8 (16) channels were able to reduce the APAE by >18× (>169×) compared to t

SUBMITTER: Guerin B 

PROVIDER: S-EPMC6778698 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature