[Mne_analysis] maxwell filtering 4D-neuroimaging/BTi data

[Helge Ahrens]

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Dear Maria,

our Triux is useing fine calibration files and I was assuming that such files, or similar, might be available in your system as well. But it is possible that this is specific for Elekta systems.

Best regards
Helge


From: mne_analysis-bounces at nmr.mgh.harvard.edu <mne_analysis-bounces at nmr.mgh.harvard.edu> On Behalf Of Maria Hakonen
Sent: Sonntag, 9. Dezember 2018 10:14
To: Discussion and support forum for the users of MNE Software <mne_analysis at nmr.mgh.harvard.edu>
Subject: Re: [Mne_analysis] maxwell filtering 4D-neuroimaging/BTi data


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Thank you all for the answers!

The result images I sent in my previous mail were calculated using ignore_ref=True.
I tried to remove bad channels before filtering but, unfortunately, this didn't solve the problem.
Are calibration files needed if I only have magnetometer and not gradiometer data? I think that I don't even have the calibration files.

However, I think that, as also Denis said, it is perhaps not that important to maxwell filetr the data. I also managed to filter the data with another filter that corresponds to maxwell filter and is previously used with bti data. The main reason why I wanted to try maxwell was that aligning the heads of the subject (i.e. destination option) would have been easy with maxwell filter.

Best,
Maria


ma 3. jouluk. 2018 klo 21.02 Eric Larson (larson.eric.d at gmail.com<mailto:larson.eric.d at gmail.com>) kirjoitti:

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However, the data looks very noisy after filtering:

Does it look any better if you use ignore_ref=True in maxwell_filter?

Eric
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