In conventional tomographic reconstruction, the pre-processing step includes flat-field correction, where each sample projection on the detector is divided by a reference image taken without the sample. When using coherent X-rays as probe, this approach overlooks the phase component of the illumination field (probe), leading to artifacts in phase-retrieved projection images, which are then propagated to the reconstructed 3D sample representation. The problem intensifies in nano-holotomography with focusing optics, that due to various imperfections create high-frequency components in the probe function. Here, we present a new iterative reconstruction scheme for holotomography, simultaneously retrieving the complex-valued probe function. Implemented on GPUs, this algorithm results in 3D reconstruction resolving twice thinner layers in a 3D ALD standard sample measured using nano-holotomography.
@article{arxiv.2407.20304,
title = {X-ray nano-holotomography reconstruction with simultaneous probe retrieval},
author = {Viktor Nikitin and Marcus Carlsson and Doga Gursoy and Rajmund Mokso and Peter Cloetens},
journal= {arXiv preprint arXiv:2407.20304},
year = {2024}
}