I am creating 4D activation sequences to POSSUM and now I need some
I have fMRI data from previous studies and now we need to create
activations for POSSUM from the data. I found some instructions from the
POSSUM homepage, but could you give bit more detailed instructions here;
especially in the case of 4D activation.
How the data should be scaled? Is the data impressed separately in every
volume or do the following volumes after the first one having just the
changes from the first activation?
Do I need to consider the effect of haemodynamic response function?
What does the following error truly means:
Creating activation4D volume and timecourse vector...
4D activation mode
Testing if the values in the activation volumes are smaller than the T2*
WARNING: Perturbation in the T2* values bigger than the T2* values.
I sent one email at last week about the memory consumption of the POSSUM
simulator processes in the SGE. Can you give any advices to that now?
I think I found a bug in possumX in fsl version 4.1.4 from the line 240:
I guess it should be
With the 0 the script creates one extra process to the SGE, which is
disturbing if the maximum amount of processes per user is limited in the
system. Could you check that it does not have any other effects to the
Methods and Models for Biological Signals and Images group of Signal
Processing department in Tampere University of Technology