[Eeglablist] Regarding Simultaneous fMRI-EEG Data

[Scott Makeig]

We built a scaffold out of PVC pipe to hold the electrode cable coming out
of the head and lead it out of the middle of the back end of the scanner
bore to the EEG system. I don't recall whether we had proof that this
improved the results, but we believed that it should...

Scott Makeig

On Thu, Sep 10, 2009 at 11:25 PM, Makoto Miyakoshi <
mataothefifth at yahoo.co.jp> wrote:

> Dear Deepali,
>
> The three steps you told me is the same.
> Please check the following things:
>
> 1.Do you synchronize the MRI with the EEG recorder? Do you see 'sync on'
> markers?
> 2.Do you use appropriate dynamic range and filter for recording signals?
>
> Another thing which I believe important but not validated yet is the
> placement of the EEG recorder. The following thing is not validated
> officially, to please read it with caution. In the product manual, it is
> recommended that you should sit it on the bore, but I found that EPI scan
> shakes it terribly. You can easily confirm it by touching it while you run
> EPI scan. Hold it in your hand in the air without touching the inner wall
> and you still feels the vibration exactly in the same way. Believe it or
> not, I had been falling the simultaneous recording more than 15 times, but
> finally obtained good data just recently after removing the EEG recorder
> out of the bore.
>
> Makoto
>
>
> --- Deepali Shewale <deepali.shewale at gmail.com> wrote:
>
> >  Dear Makoto,
> > Even i am working on similar stuff of removing Gradient and BKG
> > artifact
> > removal from EEG data in Analyzer. However, i am not able to remove
> > the
> > gradient artifact completely, there is still some residual artifact
> > remaining in the data because of which it is not removing BKG
> > artifact
> > effectively also. I am removing gradient artifact in following way:
> > 1] I am writing markers based on Volume.
> > 2] Subtracting the template based on Correlation option.
> > 3] Applying LPF using IIR filter. Slope for IIR filter 48 and
> > cut-off Frequency 50 Hz.
> > I feel i am doing all this step correctly following the manual, bt
> > still not
> > getting proper results. i am not getting where exactly i am going
> > wrong. can
> > you just help me out with this, if possible can you mail me the
> > complete
> > list of steps you are performing while doing Gradient artifact
> > correction.
> >
> > Thanks.
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation, University of
California San Diego, La Jolla CA 92093-0961, http://sccn.ucsd.edu/~scott
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