[Mne_analysis] Fwd: DICS_wrong_hemisphere_reconstruction {Disarmed}

[Eric Larson]

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Maybe if you develop and simplify some scripts in FieldTrip and MNE that
are meant to do the same thing, someone could have a look and spot an
issue. I think without this it will be hard to know where the problem is.

Eric


On Mon, Dec 14, 2020 at 12:29 PM Edoardo Pinzuti <edoardo.pinzuti at gmail.com>
wrote:

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>
> yes but in MNE everything is generated with the mne package and still I
> get the source in the opposite hemisphere, so I don t get where is the
> error because things seems to be aligned properly
>
> Il giorno lun 14 dic 2020 alle ore 18:18 Eric Larson <
> larson.eric.d at gmail.com> ha scritto:
>
>>         External Email - Use Caution
>>
>> On the other hand if I apply a different transformation matrix to the
>>> grad ( to bring everything aligned with the imported headmodel and
>>> sourcemodel from mne) the peak is on the frontal left. So I guess I have a
>>> problem with the coordinates and there is not flipping or other issue in
>>> the source model or beamforming method.
>>>
>>> Should I  bring everything to ctf coordinates in mne ? do you know why
>>> this happened?
>>>
>>
>> MEG sensors in MNE should be in MEG device coordinates, EEG electrodes in
>> head coordinates, source positions in FreeSurfer surface RAS coordinates.
>> IIRC this differs from FieldTrip where things might live in head
>> coordinates, so somehow you have to make sure that your data are aligned
>> properly in both pieces of software when using them.
>>
>> Generally the safest way to do this is to make sure all your data (raw
>> instance, source model, BEM, etc.) are generated by a single package --
>> either FieldTrip or MNE, not some from one and other parts from the other.
>> But you can in principle mix them, but when you do this you have to be
>> careful about coordinate frames.
>>
>> Eric
>>
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