2012/7/18 Douglas N Greve <greve@nmr.mgh.harvard.edu>

Try this
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/fast_retroicor.m

On 07/18/2012 01:25 PM, Caspar M. Schwiedrzik wrote:

Hi Doug,
thanks for your advice. I am using freesurfer-Linux-centos4_x86_64-stable-pub-v5.1.0-full, while I have a copy of peakfinder.m, fast_retroicor.m does not seem to be part of the package.
Could you let me know where to download it?
Thanks, Caspar

2012/7/18 Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>>

Hi Caspar, I don't have anything that is plug-and-play for RETROICOR.
You will need a text file to use as an external regressor with one
column for each regressor and one row for each time point. You can
play
with my matlab functions. First, pass the waveform (cardiac or
respiration) to peakfinder.m, then call fast_retroicor.m passing
it the
peaks and returning the regressors. Then save the regressors you
want in
a text file and specify them using -nuisreg option to mkanalysis-sess.
doug

On 07/18/2012 11:28 AM, Caspar M. Schwiedrzik wrote:
> Hi!
> Has someone used retroicor (retroactive correction of physiological
> noise; Glover at al. 2000) with Freesurfer?
> I would like to create nuisance regressors for EPI data based on
> cardiac and respiratory signals.
> The AFNI version of retroicor produces slice-based regressors, and I
> am not sure how to use them in Freesurfer.
> Suggestions for alternative implementations would also be
appreciated.
> Thanks!
> Caspar
>
>
>
>
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Douglas N. Greve, Ph.D.
MGH-NMR Center
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