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Proceedings Paper

In-plane spatial resolution measurements of a phase-contrast tomosynthesis prototype
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Paper Abstract

The objectives of this project are to intrinsically and quantitatively investigate the advantages of a phase-contrast (PC) tomosynthesis prototype in removing the superimposed structure noise and the effects on image qualities by an off-center shift of the object along the tube-sweep direction. Experimentally, phantoms are assembled with standard resolution patterns. Phase-contrast tomosynthesis images are acquired and reconstructed. In order to study the effects of the limited angular projections on the in-plane resolutions, all the images were reconstructed in the 2×2 binning mode only, as we will study the phase contrast effects elsewhere. The in-plane slices reconstructed from each of the experiments examined and the in-plane limiting resolutions are determined. For comparison, the resolution patterns and phantoms are also imaged by single projections. Under single x-ray projection, with only one resolution pattern, the limiting resolution of the system is 8 lp/mm; with 2 resolution patterns superimposed, the image of the resolution patterns is blurred for distinguishing line pairs. The PC tomosynthesis in-plane images show that the limiting resolution of the system is 7 lp/mm. For objects with a shift along the horizontal axis (the tube-sweep direction) by 0.8 inch, the spatial resolution is degraded to 4 lp/mm and blur occurs. As is expected, the PC tomosynthesis prototype studied in this project reveals superimposed fine structures of the object; the effect induced by the object's off-center shift is determined in a quantified way. The in-plane resolution of this system can be further improved by optimizing the system alignment, and the reconstruction algorithms.

Paper Details

Date Published: 14 February 2012
PDF: 7 pages
Proc. SPIE 8224, Biophotonics and Immune Responses VII, 82240D (14 February 2012); doi: 10.1117/12.910126
Show Author Affiliations
Di Wu, The Univ. of Oklahoma (United States)
Hui Miao, The Univ. of Oklahoma (United States)
Yuhua Li, The Univ. of Oklahoma (United States)
Xizeng Wu, The Univ. of Alabama at Birmingham (United States)
Hong Liu, The Univ. of Oklahoma (United States)

Published in SPIE Proceedings Vol. 8224:
Biophotonics and Immune Responses VII
Wei R. Chen, Editor(s)

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