[FieldTrip] interpolate missing grad positions

go puluto gopuluto at gmail.com
Mon Oct 4 19:00:12 CEST 2021


Hi Stephen,

Thanks for your very quick reply. I did the preprocessing of MEG data with
interpolation using the standard CTF275 layout, which means the data has
275 MEG channels.
However, when I read the sensor positions using ft_read_sens from the raw
data, i.e., *.ds, I found that the number of sensors is 269, i.e., 6 grad
positions are missing from the recording. Therefore, I was wondering that
do I need to interpolate these missing grad (positions) to match the
interpolated data. Are these missing channels affecting the transformation
of activities from sensors to sources? If so, how may I interpolate the
missing grad positions?

best,
Fan

On Mon, 4 Oct 2021 at 18:28, Stephen Whitmarsh <stephen.whitmarsh at gmail.com>
wrote:

> Hi Fan,
>
> You don't need to interpolate 'missing' sensors before source
> reconstruction at all - you'll get an 'interpolation' of sensor level
> activity for free once you're down to 'source level'.
> Or maybe I don't understand the question correctly, as I'm not sure why
> you say *re*-interpolate.
>
> Cheers,
> Stephen
>
>
>
>
> Op ma 4 okt. 2021 om 18:19 schreef go puluto via fieldtrip <
> fieldtrip at science.ru.nl>:
>
>> Hi there,
>>
>>
>> Does anyone know how to interpolate positions of grad (that were missing
>> at the recording session) for source reconstruction? There are 6 sensors
>> that were not recorded during MEG data collection, is there a function in
>> Fieldtrip to re-interpolate these grad positions? Thanks so much in
>> advance.
>>
>>
>> best,
>>
>> Fan
>> _______________________________________________
>> fieldtrip mailing list
>> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>> https://doi.org/10.1371/journal.pcbi.1002202
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20211004/4c5c492f/attachment.htm>


More information about the fieldtrip mailing list