FIX: Fixed typo in header include which caused Linux build error
Merge pull request #448 from paulcm/update-LongitudinalPETCT

Fixed typo in header include
BUG: fixed the bug in RSS extension that surface only evolve in one direction

a missing - sign, but took two days to locate...
Merge pull request #449 from gaoyi/update-RSSExtension

BUG: fixed the bug in RSS extension that surface only evolve in one dire...