[FieldTrip] extracting virtual time series in MNI space

Sreenivasan R. Nadar, Ph.D. sreenivasan.r.nadar at gmail.com
Mon Mar 21 18:17:39 CET 2016


Hi Arjen,

Thank you. I tried the method give in that link with ft_volumelookup for
ROIs in MNI space and make a new leadfield for the ROIs  and use the
following commands for visualization:

figure; hold on;
ft_plot_vol(headmodel, 'edgecolor', 'none', 'facealpha', 0.4);
ft_plot_mesh(lf_new.pos(lf_new.inside,:), 'facecolor','r');

However, this method doesn't work properly as the grid sometime do not fall
in the expected anatomical location.

-Vasan

On Mon, Mar 21, 2016 at 12:51 PM, Arjen Stolk <a.stolk8 at gmail.com> wrote:

> Hey Vasan,
>
> One way to do that is by 'normalizing' the subject's grid such that its
> points relate to specific points in MNI space. The procedure is described
> here:
> http://www.fieldtriptoolbox.org/tutorial/sourcemodel
>
> Using ft_volumelookup you can subsequently find the subject's grid points
> (now in MNI space) belonging to ROIs.
>
> Hope that helps,
> Arjen
>
> 2016-03-21 9:40 GMT-07:00 Sreenivasan R. Nadar, Ph.D. <
> sreenivasan.r.nadar at gmail.com>:
>
>> Hi Arjen,
>>
>> The example scripts are for on the individual "subject space". I want to
>> do the source analysis and also extracting time series for any ROIs in MNI
>> space.
>>
>> -Vasan
>>
>> On Mon, Mar 21, 2016 at 12:35 PM, Arjen Stolk <a.stolk8 at gmail.com> wrote:
>>
>>> Hey Vasan,
>>>
>>> This page ("Extract the virtual channel time-series" section) provides
>>> an example:
>>> http://www.fieldtriptoolbox.org/tutorial/connectivity
>>>
>>> Arjen
>>>
>>> 2016-03-21 9:08 GMT-07:00 Sreenivasan R. Nadar, Ph.D. <
>>> sreenivasan.r.nadar at gmail.com>:
>>>
>>>> Hi All,
>>>>
>>>> Is there any standard procedure (in Fieldtrip) for extracting virtual
>>>> (source) time series from ROIs in Talariach or MNI space?
>>>>
>>>> Thank you
>>>>
>>>> -Vasan
>>>>
>>>>
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>>
>>
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>
>
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