Experimentally enhanced model-based deconvolution of propagation-based phase-contrast data

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F16%3A00310035" target="_blank" >RIV/68407700:21670/16:00310035 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/16:00310035 RIV/68378297:_____/16:00473588

Result on the web

<a href="http://iopscience.iop.org/article/10.1088/1748-0221/11/12/C12037/meta" target="_blank" >http://iopscience.iop.org/article/10.1088/1748-0221/11/12/C12037/meta</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1748-0221/11/12/C12037" target="_blank" >10.1088/1748-0221/11/12/C12037</a>

Result language

angličtina

Original language name

Experimentally enhanced model-based deconvolution of propagation-based phase-contrast data

Original language description

In recent years phase-contrast has become a much investigated modality in radiographic imaging. The radiographic setups employed in phase-contrast imaging are typically rather costly and complex, e.g. high performance Talbot-Laue interferometers operated at synchrotron light sources. In-line phase-contrast imaging states the most pedestrian approach towards phase-contrast enhancement. Utilizing small angle deflection within the imaged sample and the entailed interference of the deflected and un-deflected beam during spatial propagation, in-line phase-contrast imaging only requires a well collimated X-ray source with a high contrast &amp; high resolution detector. Employing high magnification the above conditions are intrinsically fulfilled in cone-beam micro-tomography. As opposed of 2D imaging, where contrast enhancement is generally considered beneficial, in tomographic modalities the in-line phase-contrast effect can be quite a nuisance since it renders the inverse problem posed by tomographic reconstruction inconsistent, thus causing reconstruction artifacts. We present an experimentally enhanced model-based approach to disentangle absorption and in-line phase-contrast. The approach employs comparison of transmission data to a system model computed iteratively on-line. By comparison of the forward model to absorption data acquired in continuous rotation strong local deviations of the data residual are successively identified as likely candidates for in-line phase-contrast. By inducing minimal vibrations (few mrad) to the sample around the peaks of such deviations the transmission signal can be decomposed into a constant absorptive fraction and an oscillating signal caused by phase-contrast which again allows to generate separate maps for absorption and phase-contrast. The contributions of phase-contrast and the corresponding artifacts are subsequently removed from the tomographic dataset. In principle, if a 3D handling of the sample is available, this method als

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JN - Civil engineering

OECD FORD branch

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Project

<a href="/en/project/GA15-07210S" target="_blank" >GA15-07210S: Nonlinear fracture in structural materials – investigation of expressions of energy dissipation in failure zone via advanced experiments and modelling</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Instrumentation

ISSN

1748-0221

e-ISSN

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Volume of the periodical

2016

Issue of the periodical within the volume

12

Country of publishing house

IT - ITALY

Number of pages

8

Pages from-to

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UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85008235640