Publikation

Matched Backprojection Operator for Combined Scanning Transmission Electron Microscopy Tilt- and Focal Series

Tim Dahmen, Holger Kohr, Niels de Jonge, Philipp Slusallek

In: Microscopy and Microanalysis 21 03 Seiten 725-738 Cambridge Journals 2015.

Abstrakt

Combined tilt- and focal series scanning transmission electron microscopy is a recently developed method to obtain nanoscale three-dimensional (3D) information of thin specimens. In this study, we formulate the forward projection in this acquisition scheme as a linear operator and prove that it is a generalization of the Ray transform for parallel illumination. We analytically derive the corresponding backprojection operator as the adjoint of the forward projection. We further demonstrate that the matched backprojection operator drastically improves the convergence rate of iterative 3D reconstruction compared to the case where a backprojection based on heuristic weighting is used. In addition, we show that the 3D reconstruction is of better quality.

Weitere Links

Deutsches Forschungszentrum für Künstliche Intelligenz
German Research Center for Artificial Intelligence