[FieldTrip] source localization help

[McConnell, Keith]

What within grid and vol do I check?

In grid.leadfield, for example, I do have some NaNs, but mostly *good* data.

Keith McConnell, M.S.

513.636.0739 (desk)
513.504.9907 (cell)

Division of Pulmonary Medicine
Cincinnati Children's Hospital Medical Center
Cincinnati, OH  45229

From: fieldtrip-bounces at science.ru.nl [mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Julian Keil
Sent: Tuesday, October 15, 2013 8:32 AM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] source localization help

Hi Keith,

did you check if your output "sourcePost_nocon" contains the .avg-field (including the subfields avg.pow, avg.filter and so on)?
If not, then something goes wrong in your source analysis.

Have you checked your grid and vol? Especially, does your grid contain meaningful values, and not just NaNs?
If your lead field is only NaNs, no data will be projected.

Good Luck!

********************
Dr. Julian Keil

AG Multisensorische Integration
Psychiatrische Universitätsklinik
der Charité im St. Hedwig-Krankenhaus
Große Hamburger Straße 5-11, Raum E 307
10115 Berlin

Telefon: +49-30-2311-1879
Fax:        +49-30-2311-2209
http://psy-ccm.charite.de/forschung/bildgebung/ag_multisensorische_integration

Am 15.10.2013 um 14:21 schrieb McConnell, Keith:


Here you go.  Thanks for the help.

cfg = [];
cfg.method = 'dics';
cfg.frequency = 8;
cfg.grid = grid;
cfg.vol = vol;
cfg.dics.projectnoise = 'yes';
cfg.dics.lambda = 0;

sourcePost_nocon = ft_sourceanalysis(cfg, BAROpost);

save sourcePost_nocon sourcePost_nocon

load sourcePost_nocon





Keith McConnell, M.S.

513.636.0739 (desk)
513.504.9907 (cell)

Division of Pulmonary Medicine
Cincinnati Children's Hospital Medical Center
Cincinnati, OH  45229

From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> [mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Rojas, Don
Sent: Monday, October 14, 2013 4:12 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] source localization help

Keith,

I'm assuming that sourcePost_nocon is the output from ft_sourceanalysis. Can you provide us with the cfg for your call to ft_sourceanalysis?

Don

On Oct 14, 2013, at 1:56 PM, "McConnell, Keith" <Keith.McConnell at cchmc.org<mailto:Keith.McConnell at cchmc.org>> wrote:



Ach.  The solution may still prove to be simple, but I have made this change:

cfg = [];
cfg.downsample = 2;
cfg.parameter = 'avg.pow'; %error here for parameter = avg.pow referencing a nonexistent field
sourcePostInt_nocon = ft_sourceinterpolate(cfg, sourcePost_nocon, mri);

and now receive this error:

Reference to non-existent field 'avg'.

Thanks for the help.

Keith

Keith McConnell, M.S.

513.636.0739 (desk)
513.504.9907 (cell)

Division of Pulmonary Medicine
Cincinnati Children's Hospital Medical Center
Cincinnati, OH  45229

From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> [mailto:fieldtrip-bounces at science.ru.nl<mailto:bounces at science.ru.nl>] On Behalf Of Rojas, Don
Sent: Monday, October 14, 2013 3:29 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] source localization help

I believe you should change cfg.parameter to read

cfg.parameter = 'avg.pow'

not

cfg.parameter = 'ave.pow'


On Oct 14, 2013, at 12:14 PM, "McConnell, Keith" <Keith.McConnell at cchmc.org<mailto:Keith.McConnell at cchmc.org>> wrote:




Hello,

I am trying to run the beamformer source analysis.

In the code:

cfg = [];
cfg.downsample = 2;
cfg.parameter = 'ave.pow'; %error here for parameter = avg.pow referencing a nonexistent field
sourcePostInt_nocon = ft_sourceinterpolate(cfg, sourcePost_nocon, mri);

I am generating the error:

Reference to non-existent field 'ave'.

Any help?

Keith McConnell, M.S.

513.636.0739 (desk)
513.504.9907 (cell)

Division of Pulmonary Medicine
Cincinnati Children's Hospital Medical Center
Cincinnati, OH  45229

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