Daniil Kazantsev

yes, worth talking about it. Probably we should come up with a convenient parametrisation. If in python then this can be similar to this [script](https://github.com/dkazanc/TomoPhantom/blob/master/Wrappers/Python/wip/create_helical_phantom.py), where just linear vertical shift...

that's right. Well, in fact, I'd not mind refactoring the whole package similarly to the Regularisation Toolkit. We could change few things on the way like the one you mention?

do we still want to do some kind of unittest? I guess we could generate small data and compare with it during build time?

makes sense to do it in Cython wrapper, yes. It's on the list of things together with anatomical priors.

partially related to #118