Grating‐based x‐ray differential phase contrast imaging with twin peaks in phase‐stepping curves—phase retrieval and dewrapping
Abstract
X‐ray differential phase contrast CT implemented with Talbot interferometry employs phase‐stepping to extract information of x‐ray attenuation, phase shift, and small‐angle scattering. Since inaccuracy may exist in the absorption grating G2 due to an imperfect fabrication, the effective period of G2 can be as large as twice the nominal period, leading to a phenomenon of twin peaks that differ remarkably in their heights. In this work, the authors investigate how to retrieve and dewrap the phase signal from the phase‐stepping curve (PSC) with the feature of twin peaks for x‐ray phase contrast imaging.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 13, 2016
- Source ID
- 10.1118/1.4948690
Entities
People
- Hui Mao
- Huiqiao Xie
- Weixing Cai
- Xiangyang Tang
- Yi Yang
Organizations
- United States Department of Defense