[FieldTrip] Hello Experts

Xu, Weiyong weiyong.w.xu at jyu.fi
Wed Aug 29 12:07:09 CEST 2018

Hi Pramod,

I had similar problem for my MEG data because we did not collect the individual MRI data.

For source analysis in FieldTrip without individual MRIs, I used a simple sphere fitting and scaling method to fit a template (Colin 27, included in FieldTrip) to the polhemus headshape. First, a single sphere was fitted to the MRI scalp and another sphere was fitted to the polhemus headshape. Then I scale the MRI sphere to the same size as the polhemus headshape sphere. And use the scaled MRI template for later source analysis in FieldTrip.

Some details, I usually remove the polhemus head points on the nose, also the lower part of the scalp (from MRI template).


From: fieldtrip <fieldtrip-bounces at science.ru.nl> on behalf of Gaur, Pramod <p.gaur at ulster.ac.uk>
Sent: Tuesday, August 28, 2018 10:26:42 PM
To: FieldTrip discussion list
Subject: [FieldTrip] Hello Experts

Hi All,

Does anyone aware of how to use a template mri when individual  subject mri are not available. I am interested in MEG source modelling and I don’t have individual mri. I do have the polyhemus headshape points with the raw data.

Any help will be highly appreciated.

Best regards,

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