[Mne_analysis] No Isotrak data found in (raw .fif file)

[Stephen Politzer-Ahles]

Hi Donald,

Thanks for the suggestion. I was able to do this using mne_show_fiff and
there are indeed differences in the tags. I've attached text copies of the
output of mne_show_fiff for the subject I'm getting the error for (subj006)
and a good one (subj023). The difference seems to be that the bad subject's
fiff is missing these tags that are present in other subjects' files:

       104 = {    107 = isotrak
          213 = dig. point [5]
       105 = }    107 = isotrak
       104 = {    109 = HPI result
          213 = dig. point [3]
          222 = transform [2]
       105 = }    109 = HPI result

Is there a way to add these tags into the .fif file for that subject? I
don't know why they're missing (but I have e-mailed the person who runs our
MEG machine to see if she can tell).

Thanks again,
Steve

On Tue, Mar 6, 2012 at 2:54 PM, Krieger, Donald N. <kriegerd at upmc.edu>wrote:

> Hi Steve,
>
> You might just look at the tags in the file using the Elekta tool:
> show_fiff .  There's probably an mne or mne matlab toolbox tool which
> enables this too.
>
> Don
>
> Don Krieger, Ph.D., D.ABNM
> Department of Neurological Surgery
> University of Pittsburgh
> (412)648-9654
> ________________________________
> From: mne_analysis-bounces at nmr.mgh.harvard.edu [
> mne_analysis-bounces at nmr.mgh.harvard.edu] on behalf of Stephen
> Politzer-Ahles [politzerahless at gmail.com]
> Sent: Tuesday, March 06, 2012 3:51 PM
> To: mne_analysis at nmr.mgh.harvard.edu
> Subject: [Mne_analysis] No Isotrak data found in (raw .fif file)
>
> Hello MNEers,
>
> While doing MRI-MEG co-registration, for one particular subject when I
> open mne_analyze and try to Load Digitizer Data from the raw .fif file, I
> get this error:
>
> No Isotrak data found in (the name of the .fif file)
>
> I haven't gotten this error for any of my other subjects, and I processed
> them all the same way using a batch. Just now I tried re-doing some of the
> processing for this subject (epoching, artifact rejection, and filtering
> had already been done in CTF, but I redid the import to .fif, averaging,
> and noise covariance matrix), and still got the same problem.
>
> Does anyone have any idea what might be causing this error and how to fix
> it?
>
> Best,
> Steve Politzer-Ahles
>
> --
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
>
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-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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