[FieldTrip] constrain source solution space

[Nakhnikian, Alexander]

Hi John,


Thank you for your feedback. I'm not sure, however, I understand your suggestion. Is the idea to exclude the white matter from the head model? If so, aren't we discarding an important part of the volume conductor model? Furthermore, if I'm correctly interpreting the FAQ page I provided, it should be possible to apply a tissue mask after we've completed the 3 steps you listed since ft_sourceanalysis and ft_prepare_leadfield are both called after we have the grid, head volume, and sensor locations.


Thanks,


Alexander

________________________________
From: RICHARDS, JOHN <RICHARDS at mailbox.sc.edu>
Sent: Friday, August 5, 2016 9:51:34 AM
To: fieldtrip at science.ru.nl; Nakhnikian, Alexander
Subject: constrain source solution space

https://static-content.springer.com/esm/art%3A10.1007%2Fs10548-016-0505-3/MediaObjects/10548_2016_505_MOESM3_ESM.docx

1--prepare a grid, for the source volume
2-prepare a head volume
3-prepare electrode (or meg) scalp locations

These three elements are used for a lead field.

LF and other elements are used w EEG in ft_sourceanalysis.

There are several tutorials on FT site to do this.

John
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Today's Topics:

   1. Constrain Source solution space (Nakhnikian, Alexander)


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Message: 1
Date: Thu, 4 Aug 2016 18:25:38 +0000
From: "Nakhnikian, Alexander" <Alexander_Nakhnikian at hms.harvard.edu>
To: "fieldtrip at science.ru.nl" <fieldtrip at science.ru.nl>
Subject: [FieldTrip] Constrain Source solution space
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        <SN1PR07MB1568036B161E8337E72F69F8B7070 at SN1PR07MB1568.namprd07.prod.outlook.com>

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Hello All,


I'm trying to constrain my source space to gray matter and I found suggestions for how to do this on the FAQ: http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter

[http://www.fieldtriptoolbox.org/_media/logo-share.png]<http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter>

faq:can_i_restrict_the_source_reconstruction_to_the_grey ...<http://www.fieldtriptoolbox.org/faq/can_i_restrict_the_source_reconstruction_to_the_grey_matter>
www.fieldtriptoolbox.org<http://www.fieldtriptoolbox.org>
Yes, there are two strategies you can use. You can either make a regular 3D grid spanning the whole brain in which only grid locations in grey matter are considered ...




The problem is that I cannot figure out how to actually do this. For example, I don't see options in ft_sourceanalysis for inputing segmented mir with the tissue types of interest, now for giving the program an anatomic mask. Any feedback would be greatly appreciated.


Best,


Alexander
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