EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
Ultramicroscopy. 2011 Apr;111(5):330-6. doi: 10.1016/j.ultramic.2011.01.021. Epub 2011 Jan 20.
It is not straightforward to determine resolution for a 3D reconstruction when performing an electron tomography experiment. Different contributions such as missing wedge and misalignment add up and often influence the final resolution in an anisotropic manner. The conventional resolution measures can not be used for all of the reconstruction techniques, especially for iterative techniques which are more commonly used for electron tomography in materials science. Here we define a quantitative resolution measure that determines the resolution in three orthogonal directions of the reconstruction. As an application we use this measure to determine the optimum number of simultaneous iterative reconstruction technique (SIRT) iterations to reconstruct the gold nanoparticles, based on a high angle annular dark field STEM (HAADF-STEM) tilt series.
在进行电子断层扫描实验时，确定 3D 重建的分辨率并不简单。不同的贡献，如缺失楔形和不对准，会累积起来，并经常以各向异性的方式影响最终分辨率。传统的分辨率测量方法不能用于所有的重建技术，特别是对于迭代技术，这些技术在材料科学中的电子断层扫描中更为常用。在这里，我们定义了一种定量的分辨率测量方法，用于确定重建的三个正交方向的分辨率。作为一个应用，我们使用这个测量方法来确定最佳的同时迭代重建技术（SIRT）迭代次数，以基于高角度环形暗场扫描透射电子显微镜（HAADF-STEM）倾斜系列来重建金纳米粒子。
