Imaging Physics Section, Translational Medicine Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
Opt Lett. 2010 Jun 15;35(12):1932-4. doi: 10.1364/OL.35.001932.
We describe an x-ray differential phase-contrast imaging method based on two-dimensional transmission gratings that are directly resolved by an x-ray camera. X-ray refraction and diffraction in the sample lead to variations of the positions and amplitudes of the grating fringes on the camera. These effects can be quantified through spatial harmonic analysis. The use of 2D gratings allows differential phase contrast in several directions to be obtained from a single image. When compared to previous grating-based interferometry methods, this approach obviates the need for multiple exposures and separate measurements for different directions and thereby accelerates imaging speed.
我们描述了一种基于二维透射光栅的 X 射线差分相位衬度成像方法，该方法可以通过 X 射线相机直接分辨。样品中的 X 射线折射和衍射会导致相机上光栅条纹的位置和幅度发生变化。这些效应可以通过空间谐波分析来量化。使用二维光栅可以从单个图像中获得多个方向的差分相位对比。与以前基于光栅的干涉测量方法相比，这种方法无需多次曝光，也无需对不同方向进行单独测量，从而加快了成像速度。
