All I know about this template is what is included in spm_templates.man
% templates/SPECT.nii
% -------------------
% The SPECT template was provided by Leighton Barnden. It is the
% average of 90 normal Tc-99m HMPAO scans. Scatter was subtracted
% using a lower 111-125 keV window. For spatial normalisation, scalp
% was first masked (after an initial affine transformation to the
% SPM2 SPECT template) by weighting with ../spm99/apriori/brainmask.
% These scans were then spatially normalised to the (masked) SPM2
% SPECT template. The same deformations were applied to the scans
% with extra-cerebral activity and these were averaged. The result
% was affine normalised to .../apriori/gray to correct for an
% apparent midline offset in this and earlier SPECT and PET
% templates.
% Here are the ages (years) and sexes (1=F, 0=M) of the subjects...
% age = [ ...
% 46 24 27 42 45 56 51 53 41 44 ...
% 44 46 28 24 30 58 43 45 24 29 ...
% 20 42 47 27 54 21 32 19 19 43 ...
% 29 43 20 28 59 21 60 46 37 23 ...
% 40 50 50 81 48 47 22 79 24 44 ...
% 74 47 54 78 43 35 54 60 57 55 ...
% 59 57 18 52 67 62 57 47 58 67 ...
% 62 67 61 64 38 37 31 48 60 30 ...
% 31 36 32 25 66 40 38 31 37 39];
% sex = [ ...
% 1 1 0 1 0 1 1 0 1 1 ...
% 1 0 1 0 0 1 0 1 1 0 ...
% 0 1 0 0 1 1 0 1 1 0 ...
% 1 0 0 1 1 0 1 1 1 0 ...
% 0 1 1 0 0 1 0 0 1 0 ...
% 1 0 0 0 1 0 1 1 0 0 ...
% 1 0 1 0 1 1 0 1 0 1 ...
% 0 0 1 1 0 1 1 0 1 0 ...
% 1 1 0 1 1 1 1 1 1 1];
%
Best regards,
-John
On 18 July 2012 20:21, Moran Artzi <[log in to unmask]> wrote:
> Dear Experts,
> I have a question regarding the SPECT template.
> Can it be refer also as brain perfusion template, representing the cerebral perfusion?
> What is the meaning of the intensity value? Are they normalized relative to any reference value?
>
> Thanks a lot
> Moran
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