Hi there,
I'd be grateful for your help on two points:
The equivalence of high pass filters in FSL and SPM
I have analysed a block design experiment using FSL which has also been
analysed by a colleague using SPM; we obtained quite different results.
One reason may be the length of the high pass-filter. In FSL we have set
this to 60 (twice the block length) and accepted the default given by SPM
which is 128. What would a high pass filter cutoff of 60 in FSL
correspond to in SPM? and vice versa what is the FSL equivalent of the
SPM setting of 128?
The appropriate degrees of freedom when registering warped EPI
data to the high-res.
We have registered each subjects functional EPIs to their high res scan
using Flirt set to 7 degrees of freedom. However, the EPIs and the high
res from each subject are different shapes because there is quite a lot
of warping--we are scanning at 3T. Would it make sense to use a transform
with 12 degrees of freedom?
Thanks very much,
Best wishes,
Tom
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