影子组装和形束重建在4D-STEM断层扫描中
Shahar Seifer1, Lothar Houben2, Michael Elbaum1
1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
概括
扫描传输电子显微镜 (STEM) 产生阴影图像,以实现高效,高档的明亮场成像. 这种新的方法使单个数据集的3D重建成为可能,克服了断层扫描中的场深度限制.
科学领域:
- 材料科学 材料科学 材料科学
- 电子显微镜电子显微镜
- 计算成像技术的成像
背景情况:
- 扫描传输电子显微镜 (STEM) 使用衍射图像进行实空间样本投影.
- 带有像素检测器的4D-STEM设置可以在补丁中获取这些图像.
- 在TEM/STEM中,传统的明亮场成像在速度和场深度上有局限性.
研究的目的:
- 开发一种高效的方法,从STEM数据中生成升级的明亮场图像.
- 为了展示创建3D影子体积和启用倾斜断层扫描的能力.
- 为了克服断层扫描中关于样品厚度的平行投影假设.
主要方法:
- 采集STEM衍射图像的补丁补丁用一个像素化探测器.
- 将这些影子图像组装成一个剪辑,以实现更高级的明亮场景染.
- 同步阴影补丁重叠重建3D阴影体积并执行倾斜断层扫描.
主要成果:
- 实现了高效,高档的明亮场成像,与倾斜校正图像相比.
- 在特定条件下证明与形光束重建的等价性.
- 从单个数据集中染了3D影子体积,通过倾斜断层扫描实现了全背投影重建.
结论:
- 开发的STEM影像成像技术为明亮场图像提供了有效的替代方案.
- 这种方法允许进行3D重建,并绕过传统断层扫描的局限性.
- 这种方法对能量损失和色谱偏差具有稳定性,类似于STEM技术.
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