Wen Han, Wolfe Douglas E, Gomella Andrew A, Miao Houxun, Xiao Xianghui, Liu Chian, Lynch Susanna K, Morgan Nicole
Imaging Physic Laboratory, Biophysics and Biochemistry Center, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
Rev Sci Instrum. 2013 Jan;84(1):013706. doi: 10.1063/1.4788910.
We report on hard x-ray phase contrast imaging experiments using a grating interferometer of approximately 1/10th the grating period achieved in previous studies. We designed the gratings as a staircase array of multilayer stacks which are fabricated in a single thin film deposition process. We performed the experiments at 19 keV x-ray energy and 0.8 μm pixel resolution. The small grating period resulted in clear separation of different diffraction orders and multiple images on the detector. A slitted beam was used to remove overlap of the images from the different diffraction orders. The phase contrast images showed detailed features as small as 10 μm, and demonstrated the feasibility of high resolution x-ray phase contrast imaging with nanometer scale gratings.
我们报告了使用光栅干涉仪进行的硬X射线相衬成像实验，该干涉仪的光栅周期约为先前研究中所实现周期的十分之一。我们将光栅设计为多层堆叠的阶梯阵列，这些多层堆叠是在单次薄膜沉积过程中制造的。我们在19 keV的X射线能量和0.8μm的像素分辨率下进行了实验。小的光栅周期导致不同衍射级在探测器上清晰分离并形成多个图像。使用狭缝光束来消除不同衍射级图像的重叠。相衬图像显示出小至10μm的详细特征，并证明了使用纳米级光栅进行高分辨率X射线相衬成像的可行性。
