Parallel ptychographic reconstruction
Parallel ptychographic reconstruction
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DOI：
10.1364/oe.22.032082
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发表时间：
2014-12-29
期刊：
影响因子：
3.8
通讯作者：
Jacobsen, Chris
中科院分区：
文献类型：
--
作者：
Nashed, Youssef S. G.;Vine, David J.;Jacobsen, Chris
Ptychography是一种成像方法，通过扫描相干光束穿过物体，并通过衍射图案集的迭代相位获得图像。它能够在受物体散射强度和探测器几何形状限制的分辨率下对扩展物体成像，而不是在光学强加的限制下。随着技术进步允许对更大的领域进行成像，重建相应的更大数据量的计算挑战出现了，但同时也需要立即提供重建图像，以便可以评估在实验中采取的下一步措施。本文提出了一种并行的实时相位检索方法。它采用混合并行策略在多个图形处理单元（gpu）之间划分计算，然后采用新颖的技术将子数据集合并为单个复杂相位和振幅图像。在同步加速器光源下进行的x射线实验中，模拟样品和真实数据集显示了结果。(c) 2014年美国光学学会
Ptychography is an imaging method whereby a coherent beam is scanned across an object, and an image is obtained by iterative phasing of the set of diffraction patterns. It is able to be used to image extended objects at a resolution limited by scattering strength of the object and detector geometry, rather than at an optics-imposed limit. As technical advances allow larger fields to be imaged, computational challenges arise for reconstructing the correspondingly larger data volumes, yet at the same time there is also a need to deliver reconstructed images immediately so that one can evaluate the next steps to take in an experiment. Here we present a parallel method for real-time ptychographic phase retrieval. It uses a hybrid parallel strategy to divide the computation between multiple graphics processing units (GPUs) and then employs novel techniques to merge sub-datasets into a single complex phase and amplitude image. Results are shown on a simulated specimen and a real dataset from an X-ray experiment conducted at a synchrotron light source. (c) 2014 Optical Society of America