A method to estimate the spatial extent of activation in thalamic deep brain stimulation.
Journal Article (Journal Article)
Objective
The goal of this study was to develop, evaluate, and apply a method to quantify the unknown spatial extent of activation in deep brain stimulation (DBS) of the ventral intermedius nucleus (Vim) of the thalamus.Methods
The amplitude-distance relationship and the threshold amplitudes to elicit clinical responses were combined to estimate the unknown amplitude-distance constant and the distance between the electrode and the border between the Vim and the ventrocaudal nucleus (Vc) of the thalamus. We tested the sensitivity of the method to errors in the input parameters, and subsequently applied the method to estimate the amplitude-distance constant from clinically-measured threshold amplitudes.Results
The method enabled estimation of the amplitude-distance constant with a median squared error of 0.07-0.23V/mm2 and provided an estimate of the distance between the electrode and the Vc/Vim border with a median squared error of 0.01-0.04mm. Application of the method to clinically-measured threshold amplitudes to elicit paresthesias estimated the amplitude-distance constant to be 0.22V/mm2.Conclusions
The method enabled robust quantification of the spatial extent of activation in thalamic DBS and predicted that stimulation amplitudes of 1-3.5V would produce a mean effective radius of activation of 2.0-3.9mm.Significance
Knowing the spatial extent of activation may improve methods of electrode placement and stimulation parameter selection in DBS.Full Text
Duke Authors
Cited Authors
- Kuncel, AM; Cooper, SE; Grill, WM
Published Date
- September 2008
Published In
Volume / Issue
- 119 / 9
Start / End Page
- 2148 - 2158
PubMed ID
- 18632304
Pubmed Central ID
- PMC2587000
Electronic International Standard Serial Number (EISSN)
- 1872-8952
International Standard Serial Number (ISSN)
- 1388-2457
Digital Object Identifier (DOI)
- 10.1016/j.clinph.2008.02.025
Language
- eng