The values are in the range of zero to one (after accounting for the
scalefactor in the header) and are intended to represent the
probability of grey matter (or whatever tissue) given the data and
model. Generally, the better the data and the more accurately the
model fits, then the closer the values are to either zero or one.
Note that Jacobian scaled versions have a different interpretation.
Best regards,
-John
2010/10/3 Joćo Duarte <[log in to unmask]>:
> Dear SPM community,
>
> I was wondering about how to interpret the intensity signal in the
> segmented images of GM, WM and CSF. What's the range of the signal
> intensity values in the GM image, for example? It depends on the range
> of the raw image or does it have a specific interval?
>
> And what does it mean to have a voxel with higher intensity signal
> than another voxel, in the GM image? Does it mean that voxel has
> higher gray matter volume if it is a non-linear only modulated
> normalized GM image?
>
> Thanks for any help
>
> Joćo Duarte
>
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