Characterization of a laboratory-based X-ray computed nanotomography system for propagation-based method of phase contrast imaging

Characterization of a laboratory-based X-ray computed nanotomography system for propagation-based method of phase contrast imaging

Článek WoS

Phase contrast imaging (PCI) is used to extend X-ray computed nanotomography (nCT) technique for analyzing samples with a low X-ray contrast, such as polymeric structures or soft tissues. Although this technique is used in many variations at synchrotrons, along with the development of X-ray tubes and X-ray detectors, a phase contrast imaging becomes available also for laboratory systems. This work is focused on determining the conditions for propagation-based PCI in laboratory nCT systems based on three criteria. It is mostly employed in near-field imaging regime, which is quantified via Fresnel number. X-rays must reach certain degree of coherence to form edge-enhancement. Finally, setup of every CT measurement has to avoid geometrical unsharpness due to the finite focal spot size. These conditions are evaluated and discussed in terms of different properties and settings of CT machine. Propagation-based PCI is tested on a sample of carbon fibres reinforced polyethylene and the implementation of Paganin phase retrieval algorithm on the CT data is shown.

Phase contrast imaging (PCI) is used to extend X-ray computed nanotomography (nCT) technique for analyzing samples with a low X-ray contrast, such as polymeric structures or soft tissues. Although this technique is used in many variations at synchrotrons, along with the development of X-ray tubes and X-ray detectors, a phase contrast imaging becomes available also for laboratory systems. This work is focused on determining the conditions for propagation-based PCI in laboratory nCT systems based on three criteria. It is mostly employed in near-field imaging regime, which is quantified via Fresnel number. X-rays must reach certain degree of coherence to form edge-enhancement. Finally, setup of every CT measurement has to avoid geometrical unsharpness due to the finite focal spot size. These conditions are evaluated and discussed in terms of different properties and settings of CT machine. Propagation-based PCI is tested on a sample of carbon fibres reinforced polyethylene and the implementation of Paganin phase retrieval algorithm on the CT data is shown.

X-ray computed nanotomography, laboratorybased X-ray computed nanotomography, phase contrast imaging, propagation based imaging, characterization of CT system.

X-ray computed nanotomography, laboratorybased X-ray computed nanotomography, phase contrast imaging, propagation based imaging, characterization of CT system.

KALASOVÁ, D.; ZIKMUND, T.; PÍNA, L.; TAKEDA, Y.; HORVÁTH, M.; OMOTE, K.; KAISER, J.

2021

04.04.2020

IEEE Transactions On Instrumentation and Measurement

0018-9456

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

69

4

Spojené státy americké

1170

1178

9

https://ieeexplore.ieee.org/document/8686191