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Proceedings Paper

Towards a dual phase grating interferometer on clinical hardware
Author(s): Johannes Bopp; Veronika Ludwig; Michael Gallersdörfer; Maria Seifert; Georg Pelzer; Andreas Maier; Gisela Anton; Christian Riess
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Paper Abstract

In the last decades, several interferometric phase sensitive X-ray imaging setups with highly incoherent sources were developed. One of the clinically most promising setups is the Talbot-Lau interferometer. However, these systems still suffer from some challenges that prevent their clinical use. One challenge is the post-patient attenuation of the analyzer grating, that doubles the effective dose. To address this issue, new setup designs were proposed using a second phase grating, instead of the absorbing analyzer grating. Those two phase gratings together can create a beat pattern at the detector that can be resolved by the detector directly. In this paper the simulation tool CXI is validated for dual phase grating setups. Using the simulation, we found an optimal setup using existing gratings. A first feasibility study is shown with two phase gratings of 4.12 and 4.37 μm. The computed visibility of 4.6 % in simulation is in good accordance with the experimental visibility of 4 %. The final visibility is a trade-off between the inter-grating distance, grating-detector distance, the beat period and the point spread function of the detector.

Paper Details

Date Published: 9 March 2018
PDF: 6 pages
Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057321 (9 March 2018); doi: 10.1117/12.2292811
Show Author Affiliations
Johannes Bopp, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Veronika Ludwig, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Michael Gallersdörfer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Maria Seifert, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Georg Pelzer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Andreas Maier, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Gisela Anton, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Christian Riess, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 10573:
Medical Imaging 2018: Physics of Medical Imaging
Joseph Y. Lo; Taly Gilat Schmidt; Guang-Hong Chen, Editor(s)

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