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Numerical comparison of x-ray differential phase contrast and attenuation contrast

Dieter Hahn
•
Pierre Thibault
•
Martin Bech
altro
Franz Pfeiffer
2012
  • journal article

Periodico
BIOMEDICAL OPTICS EXPRESS
Abstract
We present a numerical tool to compare directly the contrastto-noise-ratio (CNR) of the attenuation- and differential phase-contrast signals available from grating-based X-ray imaging for single radiographs. The attenuation projection is differentiated to bring it into a modality comparable to the differential phase projection using a Gaussian derivative filter. A Relative Contrast Gain (RCG) is then defined as the ratio of the CNR of image values in a region of interest (ROI) in the differential phase projection to the CNR of image values in the same ROI in the differential attenuation projection. We apply the method on experimental data of human breast tissue acquired using a grating interferometer to compare the two contrast modes for two regions of interest differing in the type of tissue. Our results indicate that the proposed method can be used as a local estimate of the spatial distribution of the ratio δ/β, i.e., real and imaginary part of the complex refractive index, across a sample. © 2012 Optical Society of America.
DOI
10.1364/BOE.3.001141
WOS
WOS:000304965700001
Archivio
http://hdl.handle.net/11368/2977493
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84863918818
Diritti
metadata only access
Soggetti
  • Attenuation contrast

  • Complex refractive in...

  • Contrast mode

  • Differential attenuat...

  • Differential phase

  • Differential phase co...

  • Gaussian derivative f...

  • Grating interferomete...

  • Human breast tissue

  • Imaginary part

  • Numerical comparison

  • Numerical tool

  • Phase-contrast

  • Region of interest

  • Regions of interest

  • Xray imaging

Web of Science© citazioni
11
Data di acquisizione
Mar 24, 2024
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