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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Comput Med Imaging Graph. 2008 Nov 11;33(1):7–16. doi: 10.1016/j.compmedimag.2008.09.004
(A1): fbt is sufficiently slow varying such that there exist homogeneous regions in the foreground of C that represent the same object material.
(A2): C with its background variation results from a known invertible operation Τ between Cu and Cbt.