Wang Zhili, Liu Dalin, Zhang Jin, Huang Wanxia, Yuan Qingxi, Gao Kun, Wu Zhao
School of Electronics and Applied Physics, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China.
Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, People's Republic of China.
J Synchrotron Radiat. 2018 Jul 1;25(Pt 4):1206-1213. doi: 10.1107/S1600577518007439. Epub 2018 Jun 17.
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.
为了在基于X射线分析仪的成像中获取物体的吸收、折射和超小角X射线散射（USAXS）特性，提出了一种三图像算法。基于对摇摆曲线的高斯拟合，从理论上推导并提出了该新算法，并通过同步辐射实验进行了验证。与多图像射线照相相比，该算法只需要最少三次强度测量，因此在简化采集过程和减少数据采集时间方面具有优势，这对于体内成像和相断层扫描等特定应用尤为重要。此外，检索算法可以专门用于已知物体一定程度先验知识的特定情况，有可能将强度测量的最小数量减少到两次。此外，从理论上研究了角度不对准对检索图像准确性的影响，这可用于图像解释和数据采集过程的优化。
