Group-level analysis of induced electric field in deep brain regions by different TMS coils

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-01-16
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Physics in Medicine and Biology, Volume 65, issue 2
Abstract
Deep transcranial magnetic stimulation (dTMS) is a non-invasive technique used for the treatment of depression and obsessive compulsive disorder. In this study, we computationally evaluated group-level dosage for dTMS to characterize the targeted deep brain regions to overcome the limitations of using individualized head models to characterize coil performance in a population. We used an inter-subject registration method adapted to the deep brain regions that enable projection of computed electric fields (EFs) from individual realistic head models (n = 18) to the average space of deep brain regions. The computational results showed consistent group-level hotspots of the EF in the deep brain regions. The halo circular assembly coils induced the highest EFs in deep brain regions (up to 50% of the maximum EF in the cortex) for optimized positioning. In terms of the trade-off between field spread and penetration, the performance of the H7 coil was the best. The computational model allowed the optimization of generalized dTMS-induced EF on deep region targets despite inter-individual differences while informing and possibly minimizing unintended stimulation of superficial regions and possible mixed stimulation effects from deep and cortical areas. These results will facilitate the decision process during dTMS interventions in clinical practice.
Description
12 kk embargo kulunut, kokoteksti avattu 12.3.2021 / Marja M.
Keywords
Deep transcranial magnetic simulation, Group-level, Electric field, Anatomical human head model, Deep brain regions
Other note
Citation
Gomez-Tames , J , Hamasaka , A , Hirata , A , Laakso , I , Lu , M & Ueno , S 2020 , ' Group-level analysis of induced electric field in deep brain regions by different TMS coils ' , Physics in Medicine and Biology , vol. 65 , no. 2 , 025007 . https://doi.org/10.1088/1361-6560/ab5e4a