  Joint ptychography and tomography (JPT) is a recently developed framework
that enables high-resolution reconstruction of 3D volumes with significantly
relaxed constraints on probe overlap at adjacent scan positions. In
ptychographic X-ray computed tomography (PXCT) experiment scanning translations
are controlled with high-precision piezo-stages, while run-out errors of
rotational stages are corrected by aligning phase-retrieved projections.
However, such projections are by definition not available for JPT and would
thus require precise knowledge of the angular positioning of the sample, which
is prohibitively limited by hardware precision. Here, we present a method for
correcting the misalignment of ptychographic tomography data with respect to
the rotation axis without having to retrieve individual phase projections. This
will facilitate development and application of JPT in providing fast
data-efficient nanotomography experiments.
