论文标题
使用倾斜的LAUE分析仪基于X射线相对比成像的层析成像重建
Tomographic Reconstruction using Tilted Laue Analyser Based X-ray Phase-Contrast Imaging
论文作者
论文摘要
基于分析的相对比对比成像（ABPCI）是一种相对比较成像方法，可产生弱吸收材料的高对比度图像。但是，它仅对位于分析仪晶体衍射平面（即一个维度； 1-D）的相变敏感，因为它对位于分析仪晶体衍射平面上的相位变化高度敏感。为了准确地说明和测量波场样本相互作用产生的相位效应，ABPCI和其他1-D相灵的方法必须达到2-D相灵的敏感性。我们通过旋转检测器和围绕光轴的对象，将倾斜的几何方法应用于X射线ABPCI的LAUE几何设置。这使得传统上1-D相位敏感的相对比方法具有二维相位灵敏度。我们用检测器获得了超过360度的多物质幻影的层析成像数据集，并倾斜了8度。折射率的真实和虚构部分是为幻影重建的。
Analyser-Based Phase-Contrast imaging (ABPCI) is a phase-contrast imaging method that produces high contrast images of weakly absorbing materials. However, it is only sensitive to phase variations lying in the diffraction plane of the analyser crystal (i.e in one dimension; 1-D), as it is highly sensitive to phase variations lying in the diffraction plane of the analyser crystal. In order to accurately account for and measure phase effects produced by the wavefield-sample interaction, ABPCI and other 1-D phase sensitive methods must achieve 2-D phase sensitivity. We applied an inclined geometry method to a Laue geometry setup for X-ray ABPCI through rotation of the detector and object about the optical axis. This allowed this traditionally 1-D phase sensitive phase contrast method to possess 2-D phase sensitivity. We acquired tomographic datasets over 360 degrees of a multi-material phantom with the detector and sample tilted by 8 degrees. The real and imaginary parts of the refractive index were reconstructed for the phantom.
