[FieldTrip] Interpolate sources to the grey matter only

[Yun Zhao]

Hi Jan-Mathijs,

Thanks for your prompt advice.:)

I found I can specify a field called "inside" in the normalised MRI. Then
ft_sourceinterpolate will be only done to the specified space.

cfg = [];

mri_temp = ft_volumenormalise(cfg,segmentedmri);

mri_temp.inside = mri_temp.gray > mri_temp.white;

where segmentedmri is done by ft_volumesegment.


Cheers,

Rowen

On Sat, 3 Oct 2020 at 17:34, Schoffelen, J.M. (Jan Mathijs) <
jan.schoffelen at donders.ru.nl> wrote:

> Hi Rowen,
>
> Your question is a bit underspecified, so it’s hard to comment on this
> with specific hints/tips/tricks, so the best thing that you can get right
> now from the community is some very generic pointers.
>
> In general, ft_sourceinterpolate is your friend if you want to interpolate
> the functional data onto the anatomical volume. However, the function does
> not ‘know’ about which part of the anatomical volume correspond to grey
> matter, so if you want to mask your interpolated functional data, you’d
> need to create a grey matter mask, using ft_volumesegment.
>
> Best wishes,
> Jan-Mathijs
>
>
>
> On 3 Oct 2020, at 05:58, Yun Zhao <Yun.Zhao1 at monash.edu> wrote:
>
> Hello everyone,
>
> As I'm new to fieldtrip, here is one of the problems I encountered
> recently. What I have is functional and anatomical data. The functional
> data is computed for each source point (I have the grid points'
> coordinates) and the anatomical data is MRI for every subject.
>
> What I want to do is interpolating the functional data to the grey matter
> of the anatomy. I have tried ft_sourceinterpolate but it doesn't seem the
> method has an option for interpolating things on grey matter only.
>
> I'm wondering if someone knows how to achieve this. Or I'd try DIY. Thanks
> in advance.
>
> Kind regards,
> Rowen
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