Rutishauser Simon, Donath Tilman, David Christian, Pfeiffer Franz, Marone Federica, Modregger Peter, Stampanoni Marco
Paul Scherrer Institut, Villigen PSI, Switzerland.
Opt Express. 2011 Dec 5;19(25):24890-6. doi: 10.1364/OE.19.024890.
We report on a setup for differential x-ray phase-contrast imaging and tomography, that measures the full 2D phase-gradient information. The setup uses a simple one-dimensional x-ray grating interferometer, in which the grating structures of the interferometer are oriented at a tilt angle with respect to the sample rotation axis. In such a configuration, the differential phase images from opposing tomography projections can be combined to yield both components of the gradient vector. We show how the refractive index distribution as well as its x, y, and z gradient components can be reconstructed directly from the recorded projection data. The method can equally well be applied at conventional x-ray tube sources, to analyzer based x-ray imaging or neutron imaging. It is demonstrated with measurements of an x-ray phantom and a rat brain using synchrotron radiation.
我们报告了一种用于差分X射线相衬成像和断层扫描的装置，该装置可测量完整的二维相位梯度信息。该装置使用一个简单的一维X射线光栅干涉仪，其中干涉仪的光栅结构相对于样品旋转轴以倾斜角度定向。在这种配置下，来自相反断层扫描投影的差分相位图像可以组合起来，以产生梯度矢量的两个分量。我们展示了如何直接从记录的投影数据中重建折射率分布及其x、y和z梯度分量。该方法同样适用于传统的X射线管源、基于分析仪的X射线成像或中子成像。通过使用同步辐射对X射线体模和大鼠大脑进行测量来证明这一点。
