[Eeglablist] fMRI artifact removal
Marcel.Bastiaansen at fcdonders.ru.nl
Wed Sep 28 01:57:55 PDT 2005
I have no experience with the fMRIb tool, but:
It is my experience that everything below 1 KHz is way too low to
adequately sample the gradient artefacts produced by the EPI sequence.
This will result in a shape of the gradient artefact that varies from
volume to volume. This makes it impossible to compute anaverage gradient
artefact for the subtraction.
You should sample at 5 KHz or higher to get rid of this problem.
Yuko Yotsumoto wrote:
> Hi all,
> I have EEG data recorded in the fMRI scanner.
> Our EEGs were recorded with 957 Hz, while fMRI was operating at 4TR
> with 35 slices. Recording time was about 160 sec. Trigger signals were
> obtained at every image acquisition (=35 triggers for 4 TR).
> I'm trying to remove EPI noise artifacts with fMRIb plug-in, but have
> been unable to get clean results.
> With fMRIb plug-in, I used parameter sets such as follows.
> Low-pass filter cut off : 30
> Interpolation folds : 21
> Artifact-timing event : slice
> ANC : on
> Correct for missing triggers : off
> Relative trigger location : 0
> # of residuals PC to remove : auto
> I am wondering if our sampling rate of 957 Hz might not be high enough
> to use fMRIb plug-in. Have anybody in this mailing list tried this
> plug in with a similar sampling rate? Did it work?
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dr. Marcel C.M. Bastiaansen.
FC Donders Centre for Cognitive Neuroimaging
Visiting address: Kapittelweg 29, 6525 EN Nijmegen, the Netherlands
Mailing address: Trigon 181, PO Box 9101, 6500 HB Nijmegen, the Netherlands
phone: + 31 24 3610 882
fax: + 31 24 3610 989
mail: marcel.bastiaansen at fcdonders.ru.nl
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