Hi Uma,
I am not familiar with the "beta" and "con" volumes. However, when I
searched google, I found a couple of web pages that state that in the
"beta" and "con" volumes, voxels outside the brain are set to Nan (not
a number).
The web page "http://psyphz.psych.wisc.edu/~oakes/spm/spm_how_tos.html";
states " One caveat which you may know if you've followed the list, is
that the con**.img and beta*.img images have the areas outside the
brain values set
to NaN".
Something similar to this is posted on the SPM99 web site
"http://www.fil.ion.ucl.ac.uk/spm/software/spm99/"; that voxels outside
the brain are set to 0 or Nan.
Caret5 expects all voxels in a volume to have valid numerical values.
You will need to find a way to convert the NaN voxels to zeros in your
volumes.
----------------------------------------------------------
John Harwell
[EMAIL PROTECTED]
314-362-3467
Department of Anatomy and Neurobiology
Washington University School of Medicine
660 S. Euclid Ave. Box 8108
St. Louis, MO 63110 USA
On Jul 25, 2005, at 1:08 PM, Uma Sreekumar wrote:
Hi all,
I am new to Caret. I am trying to map results of my
group level analysis performed in SPM99 onto the PALS
atlas in Caret 5.3.
While I am able to map the spmT*.hdr for the
functional volume (as per the online documentation
provided), I am unable to map the con*.hdr or
beta*.hdr. Following around 80% processing, wherein
both the scaling and descaling ranges are read as -NaN
-NaN, the programme crashes with the message
sqrt: domain error.
All required settings (voxel size etc) seem to be
correct. I have gone through the previous mails in the
list. Shouldnt it be possible to map any SPM *.hdr
file through Caret? Help of any kind would be highly
appreciated.
Best regards,
Uma Sreekumar
-----------------------------
Y. Uma Sreekumar
NMR Research Centre,
Institute of Nuclear Medicine and Allied Sciences,
Delhi- 110 054, INDIA
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