[FieldTrip] Align a predefined grid source model to an exciting head model

[Tzvetan Popov]

Hi,
I’m not sure I understood your question but if your mri is missing description of the coordsys but you know it, you could define it yourself by e.g. mri.coordsys = ’mni’. Alternatively you will be asked to define the directions of the x,y,z axes. Information about that can be found here:
http://www.fieldtriptoolbox.org/faq/how_are_the_different_head_and_mri_coordinate_systems_defined <http://www.fieldtriptoolbox.org/faq/how_are_the_different_head_and_mri_coordinate_systems_defined>

As such FieldTrip does not modify the head model coordsys at all. The head model is based on the coordsys defined by the input mri.
good luck
tzvetan


> Am 10.01.2018 um 09:53 schrieb Fereshte <fereshte.ramezani at gmail.com>:
> 
> Dear Txvetan,
> Thank you for your answer. How does the filedtrip modify the head model coordinate system if no coordinate is defined for the mri image given (to make the FEM head model) by user? 
> Thanks in advance!
> Regards,
> Fereshte 
> On Mon, Jan 8, 2018 at 11:41 AM Tzvetan Popov <tzvetan.popov at uni-konstanz.de <mailto:tzvetan.popov at uni-konstanz.de>> wrote:
> Hi Fereshte,
> 
> this is the relevant tutorial that’d help you out: http://www.fieldtriptoolbox.org/tutorial/sourcemodel#subject-specific_grids_that_are_equivalent_across_subjects_in_normalized_space <http://www.fieldtriptoolbox.org/tutorial/sourcemodel#subject-specific_grids_that_are_equivalent_across_subjects_in_normalized_space>
> good luck
> tzvetan
> 
> 
> 
>> Am 08.01.2018 um 08:12 schrieb Fereshte <fereshte.ramezani at gmail.com <mailto:fereshte.ramezani at gmail.com>>:
>> 
> 
>> Dear Experts,
>> How can I align a predefined grid source model to an existing head model? ( I have aligned the electrodes to  the headmodel manually but I'm not sure how to align a dipole position on the headmodel).
>> Looking forward to hearing from you!
>> Regards,
>> Fereshte Ramezani 
> 
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