An FBP image reconstruction algorithm for x-ray differential phase contrast CT

Zhihua Qi; Guang-Hong Chen

doi:10.1117/12.772385

18 March 2008 An FBP image reconstruction algorithm for x-ray differential phase contrast CT

Zhihua Qi, Guang-Hong Chen

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 69132J (2008) https://doi.org/10.1117/12.772385
Event: Medical Imaging, 2008, San Diego, California, United States

Abstract

Most recently, a novel data acquisition method has been proposed and experimentally implemented for x-ray differential phase contrast computed tomography (DPC-CT), in which a conventional x-ray tube and a Talbot-Lau type interferometer were utilized in data acquisition. The divergent nature of the data acquisition system requires a divergent-beam image reconstruction algorithm for DPC-CT. This paper focuses on addressing this image reconstruction issue. We developed a filtered backprojection algorithm to directly reconstruct the DPC-CT images from acquired projection data. The developed algorithm allows one to directly reconstruct the decrement of the real part of the refractive index from the measured data. In order to accurately reconstruct an image, the data need to be acquired over an angular range of at least 180° plus the fan-angle. Different from the parallel beam data acquisition and reconstruction methods, a 180° rotation angle for data acquisition system does not provide sufficient data for an accurate reconstruction of the entire field of view. Numerical simulations have been conducted to validate the image reconstruction algorithm.

Citation Download Citation

Zhihua Qi and Guang-Hong Chen "An FBP image reconstruction algorithm for x-ray differential phase contrast CT", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69132J (18 March 2008); https://doi.org/10.1117/12.772385

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