[Mne_analysis] Digitization data for new Polhemus system

[Rameez S]

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Hi,

I have installed MNE pakage but I cannot seem to figure out how to import
the avg file. Can anyone help me how to import avg file?

Thanks

rameez

On Wed, May 16, 2018 at 3:22 PM, Teon Brooks <teon.brooks at gmail.com> wrote:

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>
> Hi Emily,
>
> We don't have a way to read the native file from FastScan in MNE. However,
> we do support data exported as text files. I don't have the software handy
> but there should be a way to export the surface points, electrode points,
> and the fiducials, all as separate text files. We based this off the
> routine we used for the KIT-NYU lab where we bundled the electrode points
> and the fiducials in the same file export.
>
> For creating the DigMontage, we have a function `read_dig_montage` that
> takes these text files as input.
> - The HPI are the marker points that your MEG system generate in the
> native MEG space
> - The ELP are those same points that are digitized in the native FastScan
> space with the addition of the fiducials, which are in the same native
> FastScan space.
> - The point names are labels for the markers and then the name of the
> fiducials (nasion, lpa, rpa) in their respective order from the ELP file.
>
> Please follow up if you have any more questions about this and how we
> might make it more accompanying for other lab setups.
>
> HTH,
>
> On Wed, May 16, 2018 at 1:17 PM Emily Stephen <emilyps14 at gmail.com> wrote:
>
>>         External Email - Use Caution
>>
>> Hi All,
>>
>> My lab has started using a new *Polhemus FastScan II* system to get the
>> digitization data (head shape points, electrode position points,
>> fiducials). The scanner itself doesn't identify or output the points: it
>> returns a 3d head surface image, from which we'll need to extract the
>> electrode positions, etc. We are working on a tool to label the points
>> manually and output them in a format that we can use in MNE to create a
>> DigMontage.
>>
>> (1) Has anyone used this system before with MNE? We'd rather not
>> re-invent the wheel if we don't have to.
>> (2) If not, is there a spec or detailed description of (a) the point
>> definitions and (b) digitizer file formats, that we could use as a basis
>> for the outputs of our tool?
>> (3) Any other advice for us or pitfalls that we should watch out for?
>>
>> Thanks,
>> Emily
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>
> --
> teon <http://www.twitter.com/teon_io>, phd
>
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