[Eeglablist] fMRI artifact removal
yuko at nmr.mgh.harvard.edu
Wed Sep 28 11:53:36 PDT 2005
According to their publication and web page, fMRIb plug-in works with as
low as 2048 Hz sampling rate, which I think makes this plug-in very
But 957 Hz is probably too low... I am wondering if anybody knows the
minimum requirement for sampling rate to apply fMRIb.
Marcel Bastiaansen wrote:
> Dear Yuko,
> 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.
> Marcel Bastiaansen
> 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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