DOAJ Open Access 2021

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

Simon Pinzek Alex Gustschin Tobias Neuwirth Alexander Backs Michael Schulz +2 lainnya

Abstrak

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.

Topik & Kata Kunci

Photography Computer applications to medicine. Medical informatics Electronic computers. Computer science

Penulis (7)

Simon Pinzek

Alex Gustschin

Tobias Neuwirth

Alexander Backs

Michael Schulz

Julia Herzen

Franz Pfeiffer

Format Sitasi

APA MLA BibTeX

Pinzek, S., Gustschin, A., Neuwirth, T., Backs, A., Schulz, M., Herzen, J. et al. (2021). Signal Retrieval from Non-Sinusoidal Intensity Modulations in X-ray and Neutron Interferometry Using Piecewise-Defined Polynomial Function. https://doi.org/10.3390/jimaging7100209

Akses Cepat

PDF tidak tersedia langsung

Cek di sumber asli →

Lihat di Sumber doi.org/10.3390/jimaging7100209

Informasi Jurnal

Tahun Terbit: 2021
Sumber Database: DOAJ
DOI: 10.3390/jimaging7100209
Akses: Open Access ✓