[FieldTrip] Source reconstructions

Homölle, S. (Simon) S.Homolle at donders.ru.nl
Mon Jan 14 11:36:02 CET 2019

Dear Elene,

Looking at the structure of  "electrodes", I see that there is no information about the units. Do you know in which unit this electrodes are expressed? How did you generate this structure? If I see correctly in the code ft_plot_sens assumes "mm" if no unit is specified. This means your electrode structure is not expressed in mm.

 As the unit information is missing,  ft_convert_units will not work on your electrodes. So you should add this information to  the structure, and then you would be able to use ft_convert_units.

Hope this resolves your issue! Cheers

Simon Homölle
PhD Candidate
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Phone: +31-(0)24-36-65059
From: fieldtrip <fieldtrip-bounces at science.ru.nl> on behalf of Elene Beitia Loinaz <elene.beitia at alumni.mondragon.edu>
Sent: Monday, January 14, 2019 10:52 AM
To: FieldTrip discussion list
Subject: [FieldTrip] Source reconstructions

Dear fieldtripers,

I am tryng to visualize the electrodes and the headmodel at the same time. The problem that I have is that I need to reescale one of them.

I have tried to function ft_convert_units, but I just obtain the image attached.

The structure of the information are the next ones,
     bnd: [1×3 struct]
     cond: [0.3300 0.0041 0.3300]
     mat: [3000×3000 double]
     type: 'dipoli'
     unit: 'mm'
      pnt: [133×3 double]
      label: {1×133 cell}

Code that I have used to obtained the image below:
ft_determine_coordsys (vol, 'interactive','no')

sens=ft_convert_units(sens, 'cm');
alpha 0.5

If somebody could help my I would be very grateful,


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