Multi-slice ptychographic tomography.

Multi-slice ptychographic tomography.
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DOI:
10.1038/s41598-018-20530-x
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发表时间:
2018-02-01
期刊:
影响因子:
4.6
通讯作者:
Maiden A
Maiden A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li P;Maiden A

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层析是相干衍射成像的一种形式,通过迭代算法处理衍射图以恢复样品的图像。尽管层析成像主要应用于二维,但可以通过两种方式扩展以产生三维图像:通过多层层析成像或层析层析成像。层析成像依赖于2D层析成像来为传统的层析算法提供投影,而多层螺旋CT利用层析数据中的冗余来将重建分割成一系列的轴向切片。虽然多层层析成像可以处理多个散射的厚样品,并且对数据的要求比层析层析成像小得多,但其深度分辨率相对较差。在这里,我们提出了一种结合了这两种方法的优点的成像方式,使具有少量角度测量的厚样品的各向同性3D分辨率成像成为可能。光学实验验证了我们提出的方法。
Ptychography is a form of Coherent Diffractive Imaging, where diffraction patterns are processed by iterative algorithms to recover an image of a specimen. Although mostly applied in two dimensions, ptychography can be extended to produce three dimensional images in two ways: via multi-slice ptychography or ptychographic tomography. Ptychographic tomography relies on 2D ptychography to supply projections to conventional tomographic algorithms, whilst multi-slice ptychography uses the redundancy in ptychographic data to split the reconstruction into a series of axial slices. Whilst multi-slice ptychography can handle multiple-scattering thick specimens and has a much smaller data requirement than ptychographic tomography, its depth resolution is relatively poor. Here we propose an imaging modality that combines the benefits of the two approaches, enabling isotropic 3D resolution imaging of thick specimens with a small number of angular measurements. Optical experiments validate our proposed method.
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