Hello list,
when we re-ran a full TBSS pipeline (using the tbss_2_reg -n option)
after upgrading from version 4.1.8. to 4.1.9, we got some "macroscopic"
differences in the results (visible both in the registered FA images and
in the stats results).
We traced the differences back to the tbss_2_reg and tbss_3_postreg stages:
- the average warping computed for each subject is noticeably different
between the two versions. This leads to selecting a different "best"
target, and hence to different registration results as well as different
stats results.
- even when running tbss_3_postreg 4.1.8 on data registered with
tbss_2_reg 4.1.9, the computed warp magnitudes are slightly different
than what we get in the original 4.1.8 analysis (so even the original
registration results differ between versions).
Has there bin any significant change in FLIRT or FNIRT functionality (or
any other stages of the anlysis) which may explain the above?
Many thanks for any input you may be able to provide,
Nicola
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