Hi
this is simply the brain/non-brain threshold level as % of max image
intensity, setting this to 1 means that any voxel with mean intensity
> 1% of overall max intensity is included in the filtering.
cheers
christian
On 22 Jun 2007, at 11:15, Saemann Philipp wrote:
> Hello Andreas,
>
> thank you for the answer on the hp filtering.
>
> One question back on a detail: in the instructions on "ip" its says
> <%threshold> which seems to be an obligatory input -
> what does this value refer to? Is it just a noise cutoff?
>
> I am asking as I get an error when calling
>
>> ip data data_filtered -t 50 -1
>
> (which I though would be the simpliest call for a highpass filter
> with 100
> sec cutoff 8 at TR = 2s) -
>
> but only when calling it with some threshold value the function is
> executed.
>
> Thanks again,
> Philipp
>
>
>
>
> Max Planck Institute of Psychiatry
> NMR Research Group
> Kraepelinsr. 2-10
> 80804 Munich
> Mail: [log in to unmask]
> Phone: 0049-89-30622-413
____
Christian F. Beckmann
University Research Lecturer
Oxford University Centre for Functional MRI of the Brain (FMRIB)
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
[log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann
tel: +44 1865 222551 fax: +44 1865 222717
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