Derksen, A.A.DerksenHeldmann, S.S.HeldmannPolzin, T.T.PolzinBerkels, B.B.Berkels2022-03-132022-03-132015https://publica.fraunhofer.de/handle/publica/39641610.1007/978-3-662-46224-9_58A common assumption in medical image registration is that the estimation of a globally continuous deformation field is plausible in reality. However, a sliding behavior of adjacent organ boundaries (e.g. lung and ribcage) cannot be described in a plausible way by a continuous deformation field. In this paper, we address this issue with a novel registration framework that explicitly models sliding of interfaces and can preserve discontinuities in the deformation field along predefined organ boundaries. Incorporated methods involve constrained nonlinear registration and a finite element discretization on unstructured tetrahedral meshes. Evaluation is based on the freely available DIR-Lab datasets.enconference paper