Hi ,
I am new to FSL and functional imaging. I need to analyse pASL data
which was acquired in a finger tapping experiment .I have tried using FSL
FEAT to do this (Im not sure if this the best option) but I either get no
activation areas or blobs in the wrong area.What values of spatial smoothing
FWHM and z threshold should I be using. I used FEAT to analyse some BOLD
data and it worked ok. I get blobs(in the wrong place) when using the simple
perfusion subtraction option in temporal filtering option but nothing when using
the full perfusion model in the 'Model setup' option. I get the following error in
the log script.
/usr/local/fsl/bin/fslstats thresh_zstat1 -l 0.0001 -R
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
0.000000 0.000000
/usr/local/fsl/bin/fslstats thresh_zstat2 -l 0.0001 -R
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
0.000000 0.000000
/usr/local/fsl/bin/fslstats thresh_zstat3 -l 0.0001 -R
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
0.000000 0.000000
/usr/local/fsl/bin/fslstats thresh_zstat4 -l 0.0001 -R
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
0.000000 0.000000
/usr/local/fsl/bin/fslstats thresh_zstat5 -l 0.0001 -R
2.300012 20.083227
/usr/local/fsl/bin/fslstats thresh_zstat6 -l 0.0001 -R
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
ERROR:: Empty mask image
0.000000 0.000000
Rendering using zmin=2.300012 zmax=20.083227
Does anyone know why this is happening ? Also is there anything else I can
use to analyse ASL data ? The website suggested FEAT so I started using it.
Thanks in advance
Ryan
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