Absorption, refraction and scattering retrieval in X‐ray analyzer‐based imaging. (19th June 2018)

• Record Type: Journal Article
• Authors: Wang, Zhili; Liu, Dalin; Zhang, Jin; Huang, Wanxia; Yuan, Qingxi; Gao, Kun; Wu, Zhao
• Is Part Of: Journal of synchrotron radiation. Volume 25:Part 4(2018)
• Page Start: 1206
• Page End: 1213
• Publication Date: 2018-06-19
• Subjects: X‐ray imaging -- phase contrast -- analyzer‐based imaging -- information retrieval -- USAXS -- rocking curves -- three‐image algorithms; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577518007439
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : A three‐image algorithm is proposed for simultaneous retrieval of absorption, refraction and ultra‐small‐angle scattering information in X‐ray analyzer‐based imaging. The novel algorithm is theoretically derived, and validated by synchrotron radiation experiments. Furthermore, the effect of angular mis‐alignment on the accuracy of the retrieved images is theoretically investigated. Abstract : A three‐image algorithm is proposed in order to retrieve the absorption, refraction and ultra‐small‐angle X‐ray scattering (USAXS) properties of the object in X‐ray analyzer‐based imaging. Based on the Gaussian fitting to the rocking curve, the novel algorithm is theoretically derived and presented, and validated by synchrotron radiation experiments. Compared with multiple‐image radiography, this algorithm only requires a minimum of three intensity measurements, and is therefore advantageous in terms of simplified acquisition procedure and reduced data collection times, which are especially important for specific applications such as in vivo imaging and phase tomography. Moreover, the retrieval algorithm can be specialized to particular cases where some degree of a priori knowledge on the object is available, potentially reducing the minimum number of intensity measurements to two. Furthermore, the effect of angular mis‐alignment on the accuracy of the retrieved images was theoretically investigated, which can be of use in image interpretation and optimization of the data acquisition procedure.