Single-shot quantitative x-ray imaging from simultaneous scatter and dual energy measurements: a simulation study

Adam S. Wang

doi:10.1117/12.2580728

15 February 2021 Single-shot quantitative x-ray imaging from simultaneous scatter and dual energy measurements: a simulation study

Adam S. Wang

Author Affiliations +

Proceedings Volume 11595, Medical Imaging 2021: Physics of Medical Imaging; 1159527 (2021) https://doi.org/10.1117/12.2580728
Event: SPIE Medical Imaging, 2021, Online Only

Abstract

Conventional x-ray imaging struggles with quantitation due to several challenges, including scatter, beam hardening, and multiple overlaying materials. We propose a new single-shot quantitative imaging (SSQI) method enabled by the combination of a primary modulator and a dual-layer detector to quantify area density of specific materials. The primary modulator enables scatter correction for the dual-layer detector, and the dual-layer detector enables beam hardening correction for the primary modulator. The dual-layer detector further provides motion-free dual-energy imaging from a single shot. When combined, the scatter-corrected dual-energy images can be used to create materialspecific images, including of soft tissue, bone, or iodine. A simulation study was performed of SSQI for chest x-ray imaging. We simulated projections of a digital chest phantom using a 120 kV spectrum, primary modulator, and dual-layer detector, with the addition of scatter and noise. Using the low-frequency property of scatter, a pre-calibrated material decomposition, and the known primary modulator pattern, we jointly recovered the scatter images in the dual-layer images and the material decomposition of the phantom. The resulting material decomposition accurately separated soft tissue from bone, reducing the RMSE in material-specific images by 66-84% as compared to no scatter correction. Through this simulation study, we have demonstrated the potential of SSQI for material quantification that is robust against scatter. The simplicity and broad applicability of SSQI to x-ray systems has the potential for widespread adoption, leading to improved quantitative imaging not only for chest x-ray but also for real-time image guidance and for cone-beam CT.

Conference Presentation

Citation Download Citation

Adam S. Wang "Single-shot quantitative x-ray imaging from simultaneous scatter and dual energy measurements: a simulation study", Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 1159527 (15 February 2021); https://doi.org/10.1117/12.2580728

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