# Problem with new Elekta acquisition software

**URL:** <https://mne.discourse.group/t/problem-with-new-elekta-acquisition-software/538>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [February 1, 2013, 12:24am UTC](https://mne.discourse.group/t/problem-with-new-elekta-acquisition-software/538 "2013-02-01T00:24:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [February 1, 2013, 12:24am UTC](https://mne.discourse.group/t/problem-with-new-elekta-acquisition-software/538/1 "2013-02-01T00:24:49Z")

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Our MEG Center has just upgraded the MEG machine control computer to a Linux box.  
I ran a study yesterday and saved both averages and raw data for each block of trials.  
The averaged data looks fine but the raw data files do not appear to contain the digitizer or head position information. I have tried both Elekta's show\_fiff and mne\_show\_fiff without success. Both blow up on a "segmentation fault."

Also both mne\_browse\_raw and mne\_process\_raw fail with the same error. I download the latest nightly build and tried the versions in there with the same result.

Does it make sense that the absence of head position info in a raw data file would cause this fault. If that's it, is it difficult to trap the error so that the mne\_process\_raw, etc. can just keep going? And what is the easiest way to insert the digitizer and head position information into the raw data files, since I have it from the average files, fortunately.

Thanks.

Don

Don Krieger, Ph.D.  
Department of Neurological Surgery  
University of Pittsburgh  
(412)648-9654 Office

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [February 1, 2013, 12:31am UTC](https://mne.discourse.group/t/problem-with-new-elekta-acquisition-software/538/2 "2013-02-01T00:31:13Z")

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Don,

Sorry to hear about the errant saving. One option would be to try using  
mne-python -- it might be possible to load the raw file there, add the  
necessary info to the header (stored in mne-python in raw.info), and save  
it.

If you're not too familiar with python, if you can make a sample errant  
file available, I could try loading it in mne-python myself to see if it's  
possible (and thus worth your time to get a python setup going). In any  
case, it's possible that an error thrown in python would be more  
informative than a segfault regarding the problem.

Eric

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [February 2, 2013, 2:05pm UTC](https://mne.discourse.group/t/problem-with-new-elekta-acquisition-software/538/3 "2013-02-02T14:05:49Z")

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Hi Eric et al.

We figured out Don's problem locally, it turned out that the files were corrupted during transfer. Thanks for your help.

Best Wishes,  
Avniel

Avniel Ghuman, Ph.D.  
Laboratory of Cognitive Neurodynamics  
Director of MEG Research  
Assistant Professor of Neurological Surgery and Neurobiology  
Faculty in the Center for the Neural Basis of Cognition  
University of Pittsburgh