[FieldTrip] ft_sourceplot stubbornly projects rays beyond the head

[Schoffelen, J.M. (Jan Mathijs)]

Mirek,

I could be amiss, but it sounds as if you are interpolating (or rather extrapolating) a cortical surface based source model into a volume. Although it is not clear why you would want this, because in that case I’d recommend to visualize the source power on the mesh, but if you insist in the extrapolation, you may need to specify an ‘inside’ mask to your volume, so that the what you call rays are masked. On the off chance that you are using a volume-based sourcemodel I think the origin of your problem might also lie in the absence of an ‘inside’ mask.

Best wishes,
Jan-Mathijs


> On 8 Jan 2021, at 20:48, mirek wyczesany <m.wyczesany at uj.edu.pl> wrote:
> 
> Hi, well I did multiple checks of the preceding code, confirmed alignment of all the objects and a compatibility of coordsys. A cross-check with Curry package showed a perfect match of source reconstructions with my FT pipeline. Interestingly, these nasty rays always originate exactly in the reconstructed sources...
> 
> -- 
> Mirek Wyczesany
> Psychophysiology Lab
> Jagiellonian University
> Kraków, PL
> 
> On 08/01/2021 20:11, Tzvetan Popov wrote:
>> Well it is difficult to help without the code preceding the call to ft_sourceplot. I suggest to go over it again, ensure all units are correct, geometric objects aligned. Please plot the source result before interpolation. Does this look like you’d expect?
>> Tzvetan
>>> Am 1/8/21 um 19:27 schrieb mirek wyczesany <m.wyczesany at uj.edu.pl>:
>>> 
>>> Hi Tzvetan, thanks for your immediate reply. Unfortunately, leaving only the first input arguments doesn't change anything. The rays are still there...
>>> 
>>> -- 
>>> Mirek Wyczesany
>>> Psychophysiology Lab
>>> Jagiellonian University
>>> Kraków, PL
>>> 
>>>> On 08/01/2021 19:08, Tzvetan Popov wrote:
>>>> Hi,
>>>> How about you remove the second input argument to ft_sourceplot? Leave only sourceint.
>>>> Tzvetan
>>>>>> Am 1/8/21 um 18:52 schrieb mirek wyczesany <m.wyczesany at uj.edu.pl>:
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>> _______________________________________________
>>> fieldtrip mailing list
>>> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>> https://doi.org/10.1371/journal.pcbi.1002202
>> _______________________________________________
>> fieldtrip mailing list
>> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>> https://doi.org/10.1371/journal.pcbi.1002202
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://doi.org/10.1371/journal.pcbi.1002202