| Thanks a lot for such information, I have actually used sinc interpolation
| and that's why there are some negative values (the min is relatively small :
| around -20)
| Nevertheless, I would like to make ROI measurements on different SPECT
| normalized on SPM Spect Template. And to be able to compare such
| measurements, I would like to normalize each measure by the total number of
| counts in SPECT data : should I take into account such negative values to
| assess this total number of counts ?? I think I should not ??
If you don't include the negative values, then you are likely to get biased
results.
Best regards,
-John
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