The three‐dimensional (3D) dual‐energy focal stacks (FS) imaging method has been developed to quickly obtain the spatial distribution of an element of interest in a sample; it is a combination of the 3D FS imaging method and two‐dimensional (2D) dual‐energy contrast imaging based on scanning transmission soft X‐ray microscopy (STXM). A simulation was firstly performed to verify the feasibility of the 3D elemental reconstruction method. Then, a sample of composite nanofibers, polystyrene doped with ferric acetylacetonate [Fe(acac)3], was further investigated to quickly reveal the spatial distribution of Fe(acac)3 in the sample. Furthermore, the data acquisition time was less than that for STXM nanotomography under similar resolution conditions and did not require any complicated sample preparation. The novel approach of 3D dual‐energy FS imaging, which allows fast 3D elemental mapping, is expected to provide invaluable information for biomedicine and materials science.

中文翻译：

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通过软X射线双能聚焦堆成像进行三维快速元素映射

已经开发出了三维（3D）双能量聚焦堆栈（FS）成像方法，可以快速获得样品中目标元素的空间分布；它是3D FS成像方法和基于扫描透射X射线显微镜（STXM）的二维（2D）双能对比成像的组合。首先进行仿真以验证3D元素重建方法的可行性。然后，进一步研究了复合纳米纤维样品，其中掺有乙酰丙酮铁[Fe（acac）3]的聚苯乙烯可快速揭示样品中Fe（acac）3的空间分布。此外，在相似的分辨率条件下，数据采集时间少于STXM纳米断层扫描的时间，并且不需要任何复杂的样品制备。3D双能FS成像的新颖方法，