  Factorized in the lifting structure, the wavelet transform can easily be
extended by arbitrary compensation methods. Thereby, the transform can be
adapted to displacements in the signal without losing the ability of perfect
reconstruction. This leads to an improvement of scalability. In temporal
direction of dynamic medical 3-D+t volumes from Computed Tomography,
displacement is mainly given by expansion and compression of tissue. We show
that these smooth movements can be well compensated with a mesh-based method.
We compare the properties of triangle and quadrilateral meshes. We also show
that with a mesh-based compensation approach coding results are comparable to
the common slice wise coding with JPEG 2000 while a scalable representation in
temporal direction can be achieved.
