Hello all,
I was wondering does anyone know how to tell the size of a cluster in the output results of SPM8? When I view the results I can see the peak coordinates, the number of cluster, t scores, z scores etc., but I can't seem to find the actual cluster size (in number of voxels for instance) anywhere.
Would anyone be able to shed any light on this?
Many thanks,
Fiona
On the SPM results table you find (from right to left):
set-level; cluster-level; voxel-level.
The cluster size is the k_E value (mid column under cluster-level).
Best,
M
Dear Fiona,
In addition to Markus' answer, please do remember to add your normalised voxel size when reporting cluster sizes. By default this used to be 2x2x2 mm3, but the default has moved, and it could be changed anyway. The safest way is to report cluster sizes in mm^3.
With best wishes,
Alexander
-----------------------------------------
Alexander Hammers, MD PhD
Professor (Honorary Consultant) of Imaging and Neuroscience
Head of PET Imaging Centre
Division of Imaging Sciences and Biomedical Engineering
King's College London
St Thomas' Hospital, London
Telephone +44-(0)20 20 7188 8364
Email [email protected]
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