. Author manuscript; available in PMC: 2019 Dec 1.

Published in final edited form as: Med Phys. 2018 Oct 25;45(12):5397–5410. doi: 10.1002/mp.13226

TABLE I.

Representation of TV and ICTV penalty terms as the composition of a convex function φ and a matrix B.

Penalty term	Convex function φ	Matrix B	Expected image f
TV	φ₁	B₁	f
ICTV	λ₁φ₁ + λ₂φ₂	$[\begin{matrix} B_{1} & 0 \\ 0 & B_{2} \end{matrix}]$	$[\begin{matrix} f_{1} \\ f_{2} \end{matrix}]$