I
encounter problems replicating the result of 2-Sample T-Test Analysis on
PET images. The PET images are normalized and subjected to T-Test using
SPM5 and Matlab R2008b on a 32-bit WinXP Desktop. This produced a
single cluster in the temporal lobe of patients (with p=0.005 and
voxels=50) and white/grey boxes in the Design Matrix. Please refer to
the pdf of screenshots here:
https://docs.google.com/open?id=0B7LWtFTZ-QYiNlRadm1BZTNySUU
The same results cannot be replicated on other computers
(64-bits Linux, Mac, Windows) with the same dataset. We have tried SPM5,
SPM8, standalone SPM8, Matlab 2008/2009/2012, the latest software
versions, updates and patches for both SPM and Matlab but still could
not reproduce the results. There is no single cluster in the temporal
lobe. Also black boxes (plus white/grey boxes) are obtained instead of
the white and grey boxes. We are told that something is wrong if black
boxes are obtained. The person who obtained the temporal lobe cluster on
the 32-bits, WinXP desktop also obtained the same result on her 64-bits
Win7 laptop in which SPM5 and matlab2008 are installed. She failed to
get the results when using SPM8 or ( SPM5+matlab2009) which is why she
used SPM5 with matlab2008. We need to get this working on the Mac
computers we are working with.
Will greatly appreciate help to troubleshoot the problems as we have
tried many things but still could not figure out what went wrong.
Besides the screenshots, I have also attached the mat files for your
reference below. Thank you very much.
Links for the mat files:
(1) spm5_matlab2008_winXPDesktop:
https://docs.google.com/open?id=0B7LWtFTZ-QYiZnlCQ2RoM2tXbWc(2) spm8_matlab2012_win7Desktop:
https://docs.google.com/open?id=0B7LWtFTZ-QYiY1lZbDV4c0xZNUk
(3) spm8_matlab2012_mac:
https://docs.google.com/open?id=0B7LWtFTZ-QYiX01pNVpjRDA1RkUBest regards
Anthony Ang
