Bachelor's thesis: Accelerated solving strategies in Anisotropic X-ray Dark-field Tomography
Thesis by: Felix Merkl
Advisor:
Tobias Lasser
Abstract
Anisotropic X-ray Dark-field Tomography (AXDT) enables the visualization of microstructure orientations without having to explicitly resolve them. Based on the directionally dependent X-ray dark-field signal as measured by an X-ray grating interferometer and our spherical harmonics forward model, AXDT reconstructs spherical scattering functions for every volume position, which in turn allows the extraction of the microstructure orientations. Potential applications range from materials testing to medical diagnostics.
Tasks
Subject of this thesis is the acceleration of solving methods used in AXDT. The aim is to investigate pyramid approaches as well as pre-conditioning of the large-scale inverse problem in AXDT. After investigation of suitable approaches, they are to be implemented in our C++ reconstruction framework, with a quantitative evaluation of their performace compared to a basic conjugate gradient method.
Requirements
Scientific programming, C++
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