Dipole scanning method, Source localization technique, reference

Georgios · November 14, 2020, 11:12pm

Hello,

I would like to ask a question regarding any literature reference of the dipole scanning method described in the Brainstorm website.

In particular, I have used the dipole scanning method described here "https://neuroimage.usc.edu/brainstorm/Tutorials/TutDipScan" in the website and I would like to find a reference describing this method.

Could you please provide me with any appropriate references form the literature?

Thank you so much,
Georgios

Francois · November 15, 2020, 9:27am

@John_Mosher @Sylvain
Can you please provide references for this method?
Not necessarily for the dipole scanning (I don't think this was published), but at least for the "Dipole modeling" option. The links are missing in the Source estimation tutorial (https://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation#Source_estimation_options)
Thanks

@Georgios
The dipole scanning basically selects the maximum of the "dipole modeling" maps.
To see the formula used for the various properties of the dipole, you can refer directly to the comments in the code:

github.com

brainstorm-tools/brainstorm3/blob/master/toolbox/process/functions/process_dipole_scanning.m

function varargout = process_dipole_scanning( varargin )
% PROCESS_DIPOLE_SCANNING: Generates a brainstorm dipole file from the GLS and GLS-P inverse solutions.

% @=============================================================================
% This function is part of the Brainstorm software:
% https://neuroimage.usc.edu/brainstorm
% 
% Copyright (c)2000-2020 University of Southern California & McGill University
% This software is distributed under the terms of the GNU General Public License
% as published by the Free Software Foundation. Further details on the GPLv3
% license can be found at http://www.gnu.org/copyleft/gpl.html.
% 
% FOR RESEARCH PURPOSES ONLY. THE SOFTWARE IS PROVIDED "AS IS," AND THE
% UNIVERSITY OF SOUTHERN CALIFORNIA AND ITS COLLABORATORS DO NOT MAKE ANY
% WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
% MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, NOR DO THEY ASSUME ANY
% LIABILITY OR RESPONSIBILITY FOR THE USE OF THIS SOFTWARE.
%
% For more information type "brainstorm license" at command prompt.
% =============================================================================@

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Georgios · November 17, 2020, 10:09pm

Thank you so much Francois for the detailed reply and for trying to figure this out!
It would be great if we could have these references as you mentioned above.

Best,
Georgios

AdamKalina · March 28, 2021, 7:03pm

Dear Georgios and Francois, have you found the references? In two articles where they use this method by Tamilia et al. and Alhilani et al there is reference to Hamalainen et al., 1993. Is that correct?

Sylvain · March 29, 2021, 1:41pm

Hi Folks:

The dipole scanning approach basically sifts through a predefined 3D grid and evaluates the respective goodness of fit of a dipole located at each grid point sequentially, for every time point. It is a straightforward procedure that computes a least-squares fit between the sensor data at each time point and the forward field (from the head model) of the dipole at each time point.
The other method, a non-linear dipole fitting method, is that from FieldTrip and does rely on a precomputed grid: the location of the dipole is fitted on the X-Y-Z continuum.
I hope this helps.