You can get the scalefactor by:
P=spm_get(1,'*.img');
V=spm_vol(P);
V.pinfo(1:2,:)
best regards,
-John
On Sunday 30 July 2006 09:16, Sven Haller wrote:
> Dear all
>
> I use SPM2 to spatially normalize a contrast-enhanced MR perfusion
> study. The spatial normalization itself works very well.
> BUT the data is scaled to another range. This is irrelevant for fMRI,
> but for my purposes, I want to have the values of the MRI scans.
>
> The values e.g. of the CSF in the lateral ventricle are in the range
> of approx. 2400 in the original data (siemens dicom, avanto).
> After normalization, the range is approx. 30000.
>
> How do I know the scaling factor?
> Is is a linear scaling?
> Is there any possibility not to scale the data?
> If not, how can I re-scale the normalized data to the original values?
>
> Thank you very much
> Sven
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