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# The dark-field signal provided by some phase-contrast realizations offers additional information on the small-angle scattering properties of the target.
[[File:Phase contrast benefit ratio.jpg|thumb|The benefit of phase contrast mammography relative to absorption contrast for (1) a tumor structure (“tumor”), (2) a glandular structure (“glandular”), (3) a microcalcification (“MC”), and (4) an air cavity (“air”) as a function of target size at optimal energy and equal dose.<ref name=":11">{{Cite journal|last1=Fredenberg|first1=Erik|last2=Danielsson|first2=Mats|last3=Stayman|first3=J. Webster|last4=Siewerdsen|first4=Jeffrey H.|last5=Åslund|first5=Magnus|date=2012-08-10|title=Ideal-observer detectability in photon-counting differential phase-contrast imaging using a linear-systems approach: Ideal-observer detectability in differential phase-contrast imaging|url= |journal=Medical Physics|language=en|volume=39|issue=9|pages=5317–5335|doi=10.1118/1.4739195|pmc=3427340|pmid=22957600|bibcode=2012MedPh..39.5317F }}</ref>]]
A quantitative comparison of phase- and absorption-contrast mammography that took realistic constraints into account (dose, geometry, and photon economy) concluded that grating-based phase-contrast imaging (Talbot interferometry) does not exhibit a general signal-difference-to-noise improvement relative to absorption contrast, but the performance is highly task dependent.<ref name=":11" /><ref name=":12">{{Cite book|last1=Fredenberg|first1=E.|last2=Roessl|first2=E.|last3=Koehler|first3=T.|last4=van Stevendaal|first4=U.|last5=Schulze-Wenck|first5=I.|last6=Wieberneit|first6=N.|last7=Stampanoni|first7=M.|last8=Wang|first8=Z.|last9=Kubik-Huch|first9=R. A.|last10=Hauser|first10=N.|last11=Lundqvist|first11=M.|title=Medical Imaging 2012: Physics of Medical Imaging|date=2012-02-23|editor-last=Pelc|editor-first=Norbert J.|editor2-last=Nishikawa|editor2-first=Robert M.|editor3-last=Whiting|editor3-first=Bruce R.|chapter=Photon-counting spectral phase-contrast mammography|volume=8313|chapter-url=http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.910615|location=San Diego, California, USA|pages=155–166|doi=10.1117/12.910615|arxiv=2101.09660|s2cid=121130207}}</ref> Such a comparison is yet to be undertaken for all phase contrast methods, however, the following considerations are central to such a comparison:
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