Verification of neuronavigated TMS accuracy using structured-light 3D scans

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-04-21
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
Series
Physics in Medicine and Biology, Volume 69, issue 8
Abstract
Objective. To investigate the reliability and accuracy of the manual three-point co-registration in neuronavigated transcranial magnetic stimulation (TMS). The effect of the error in landmark pointing on the coil placement and on the induced electric and magnetic fields was examined. Approach. The position of the TMS coil on the head was recorded by the neuronavigation system and by 3D scanning for ten healthy participants. The differences in the coil locations and orientations and the theoretical error values for electric and magnetic fields between the neuronavigated and 3D scanned coil positions were calculated. In addition, the sensitivity of the coil location on landmark accuracy was calculated. Main results. The measured distances between the neuronavigated and 3D scanned coil locations were on average 10.2 mm, ranging from 3.1 to 18.7 mm. The error in angles were on average from two to three degrees. The coil misplacement caused on average a 29% relative error in the electric field with a range from 9% to 51%. In the magnetic field, the same error was on average 33%, ranging from 10% to 58%. The misplacement of landmark points could cause a 1.8-fold error for the coil location. Significance. TMS neuronavigation with three landmark points can cause a significant error in the coil position, hampering research using highly accurate electric field calculations. Including 3D scanning to the process provides an efficient method to achieve a more accurate coil position.
Description
Publisher Copyright: © 2024 The Author(s). Published on behalf of Institute of Physics and Engineering in Medicine by IOP Publishing Ltd.
Keywords
dosimetric modelling, electric field, landmark pointing, navigated TMS, navigation accuracy, transcranial magnetic stimulation
Other note
Citation
Matilainen, N, Kataja, J & Laakso, I 2024, ' Verification of neuronavigated TMS accuracy using structured-light 3D scans ', Physics in Medicine and Biology, vol. 69, no. 8, 085004 . https://doi.org/10.1088/1361-6560/ad33b8