What is it about?

The paper presents a novel accelerator technique,named random signed feedback (RSF), for phase retrieval of Fresnel diffraction patterns. It shows an excellent performance compared with traditional accelerators (hybrid input output and conjugate gradient search) where an error of less than 10% could be achieved. The application of the RSF accelerator on X-ray inline phase contrast tomography strongly confirms its feasibility.

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Why is it important?

The article gives a quantifiable and practical solution for X-ray phase contrast tomography. The current methods of direct phase retrieval have critical limitations that limit their applicability such as singularity problem, noise sensitivity, or approximation restriction. The proposed technique overcomes these limitations, so it's very promising for being used widely in practice.

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This page is a summary of: A fast-converging iterative method for X-ray in-line phase contrast tomography, Applied Physics Letters, November 2012, American Institute of Physics,
DOI: 10.1063/1.4769046.
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