Signal Retrieval from Non-Sinusoidal Intensity Modulations in X-ray and Neutron Interferometry Using Piecewise-Defined Polynomial Function

Autor:	Pinzek, Simon, Gustschin, Alex, Neuwirth, Tobias, Backs, Alexander, Schulz, Michael, Herzen, Julia, Pfeiffer, Franz
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	non-sinusoidal Computer applications to medicine. Medical informatics R858-859.7 QA75.5-76.95 differential-phase contrast Article grating interferometry dark-field contrast Electronic computers. Computer science Photography ddc:004 TR1-1050 intensity modulation
Zdroj:	Journal of Imaging, Vol 7, Iss 209, p 209 (2021) Journal of imaging 7(10), 209 (2021). doi:10.3390/jimaging7100209 Journal of Imaging Volume 7 Issue 10
DOI:	10.3390/jimaging7100209
Popis:	Journal of imaging 7(10), 209 (2021). doi:10.3390/jimaging7100209 Grating-based phase-contrast and dark-field imaging systems create intensity modulations that are usually modeled with sinusoidal functions to extract transmission, differential-phase shift, and scatter information. Under certain system-related conditions, the modulations become non-sinusoidal and cause artifacts in conventional processing. To account for that, we introduce a piecewise-defined periodic polynomial function that resembles the physical signal formation process, modeling convolutions of binary periodic functions. Additionally, we extend the model with an iterative expectation-maximization algorithm that can account for imprecise grating positions during phase-stepping. We show that this approach can process a higher variety of simulated and experimentally acquired data, avoiding most artifacts. Published by MDPI, Basel
Databáze:	OpenAIRE
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