A generalized workflow for conducting electric field-optimized, fMRI-guided, transcranial magnetic stimulation.

Journal Article (Journal Article)

Transcranial magnetic stimulation (TMS) is a noninvasive method to stimulate the cerebral cortex that has applications in psychiatry, such as in the treatment of depression and anxiety. Although many TMS targeting methods that use figure-8 coils exist, many do not account for individual differences in anatomy or are not generalizable across target sites. This protocol combines functional magnetic resonance imaging (fMRI) and iterative electric-field (E-field) modeling in a generalized approach to subject-specific TMS targeting that is capable of optimizing the stimulation site and TMS coil orientation. To apply this protocol, the user should (i) operationally define a region of interest (ROI), (ii) generate the head model from the structural MRI data, (iii) preprocess the functional MRI data, (iv) identify the single-subject stimulation site within the ROI, and (iv) conduct E-field modeling to identify the optimal coil orientation. In comparison with standard targeting methods, this approach demonstrates (i) reduced variability in the stimulation site across subjects, (ii) reduced scalp-to-cortical-target distance, and (iii) reduced variability in optimal coil orientation. Execution of this protocol requires intermediate-level skills in structural and functional MRI processing. This protocol takes ~24 h to complete and demonstrates how constrained fMRI targeting combined with iterative E-field modeling can be used as a general method to optimize both the TMS coil site and its orientation.

Full Text

Duke Authors

Cited Authors

  • Balderston, NL; Roberts, C; Beydler, EM; Deng, Z-D; Radman, T; Luber, B; Lisanby, SH; Ernst, M; Grillon, C

Published Date

  • November 2020

Published In

Volume / Issue

  • 15 / 11

Start / End Page

  • 3595 - 3614

PubMed ID

  • 33005039

Pubmed Central ID

  • 33005039

Electronic International Standard Serial Number (EISSN)

  • 1750-2799

Digital Object Identifier (DOI)

  • 10.1038/s41596-020-0387-4

Language

  • eng

Conference Location

  • England