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

[Alexandre Gramfort]

Hi Stephen,

if you have the digitization points in one of the fif files for this
particular subject than we can add them to a raw file or you can load
them directly in mne_analyze. Otherwise I'm afraid you'll have to  do
the coregistration only using the 3 fiducials which is fairly
imprecise.

Alex

On Thu, Mar 8, 2012 at 4:25 PM, Stephen Politzer-Ahles
<politzerahless at gmail.com> wrote:
> 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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