A few years back I ran some analysis using SIENAX in FSL version 4.0. The version of FAST which it used was 3.53. I am trying to modify my previous work, but I have found that the segmentation process has changed, as SIENAX now uses FAST version 4.1. Is there a document which explains the changes between fast3 and fast4 other than the conversion table for the program options? Looking at my data, it seems like results using fast4 have a quicker transition from white matter to gray matter at the cerebral cortex, giving fewer partial volume voxels. Would you expect that change given the differences between versions?
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