Hi All,
I need to analyze images showing changes calculated by [(drug challenge
scan) - (baseline scan)]/(baseline scan). Each pixel has these
calculated values. Although most pixels have positive values, some
pixels have negative values.
Is there a way to do statistical analysis on both positive and negative
values? By entering a negative number such as -1 as absolute threshold
and by selecting no global normalization, SPM may run. I would like to
know if statistical calculations are done correctly for both positive
and negative values.
Thanks
Masahiro
Masahiro Fujita, MD, PhD
Staff Scientist, Molecular Imaging Branch,
National Institute of Mental Health,
Building 1, Room B3-10, 1 Center Drive, MSC-0135,
Bethesda, MD 20892-0135, USA
Phone: +1-301-451-8898
Fax: +1-301-480-3610
E-mail: [log in to unmask]
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