High-resolution ptychotomography dataset of nanoporous glass

This repository contains nanoporous glass tomography dataset, acquired at the cSAXS beamline at the Swiss Light Source at the Paul Scherrer Institute in Villigen (Switzerland). Details about the data acquisition can be found in Ref. [1].

Citation and acknowledgements

For use of the ptychographic X-ray computed tomography dataset on nanoporous glass:

[1] M. Holler, A. Diaz, M. Guizar-Sicairos, P. Karvinen, E. Färm, E. Härkönen, M. Ritala, A. Menzel, J. Raabe and O. Bunk. Scientific Reports, 4, 3857 (2014).

Alignment and tomographic reconstruction provided in "aligned_phase_sinogram" and "tomogram_delta"  were performed by a method described in

[2] M. Odstrcil, M. Holler, J. Holler, M. Guizar-Sicairos,"Alignment methods for nanotomography with deep sub-pixel accuracy", Opt. Express, (2019).

Dataset description

The provided dataset is saved in Matlab MAT v7.3 format.

stack_object - complex valued unaligned projections with dimensions [Npix_vertical, Npix_horizontal, number_of_angles]

rotation_angle -  vector of corresponding projection angles in degrees

lambda - wavelength of the illumination beam [m]

pixel_size - size of the reconstruction pixel [m]

probe_size - size of the reconstruction probe in pixels

aligned_phase_sinogram - aligned and unwrapped phase projections

tomogram_delta - reconstructed tomogram of real part of refractive index delta, n = 1-delta-i*beta