Towards a dual phase grating interferometer on clinical hardware

Johannes Bopp; Veronika Ludwig; Michael Gallersdörfer; Maria Seifert; Georg Pelzer; Andreas Maier; Gisela Anton; Christian Riess

doi:10.1117/12.2292811

9 March 2018 Towards a dual phase grating interferometer on clinical hardware

Johannes Bopp, Veronika Ludwig, Michael Gallersdörfer, Maria Seifert, Georg Pelzer, Andreas Maier, Gisela Anton, Christian Riess

Author Affiliations +

Proceedings Volume 10573, Medical Imaging 2018: Physics of Medical Imaging; 1057321 (2018) https://doi.org/10.1117/12.2292811
Event: SPIE Medical Imaging, 2018, Houston, Texas, United States

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.

Conference Presentation

Citation Download Citation

Johannes Bopp, Veronika Ludwig, Michael Gallersdörfer, Maria Seifert, Georg Pelzer, Andreas Maier, Gisela Anton, and Christian Riess "Towards a dual phase grating interferometer on clinical hardware", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057321 (9 March 2018); https://doi.org/10.1117/12.2292811

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available