原子分辨率低剂量成像中迭代平面成像的收敛特性研究。

IF 2 3区 工程技术 Q2 MICROSCOPY
Tamazouzt Chennit , Songge Li , Hoelen L. Lalandec Robert , Christoph Hofer , Nadine J. Schrenker , Liberato Manna , Sara Bals , Timothy J. Pennycook , Jo Verbeeck
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引用次数: 0

摘要

本研究研究了在低电子剂量(3e-/Å2)下一系列迭代电子型图方法的收敛特性,并特别关注了用户定义的更新强度的影响。我们证明,仔细选择该参数的值,理想情况下小于文献中常规遇到的值,对于实现投影静电势的准确重建至关重要。使用薄杂化有机-无机甲脒溴化铅(FAPbBr3)样品的4D数据集,我们表明,与文献中发现的相比,只有当物体和探针的更新强度相对较小时,才能实现收敛。此外,我们证明了在低电子剂量下,当更新强度系数降低到一定阈值以下时,重建的初始误差会增加,强调存在临界值,超过该临界值,算法就会陷入局部最小值。这些发现强调了在迭代平面摄影中需要仔细优化重建参数,特别是在低电子剂量下工作时,以确保有效收敛和结果的正确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the convergence properties of iterative ptychography for atomic-resolution low-dose imaging
This study investigates the convergence properties of a collection of iterative electron ptychography methods, under low electron doses (<103 e/Å2) and gives particular attention to the impact of the user-defined update strengths. We demonstrate that carefully chosen values for this parameter, ideally smaller than those conventionally met in the literature, are essential for achieving accurate reconstructions of the projected electrostatic potential. Using a 4D dataset of a thin hybrid organic–inorganic formamidinium lead bromide (FAPbBr3) sample, we show that convergence is in practice achievable only when the update strengths for both the object and probe are relatively small compared to what is found in literature. Additionally we demonstrate that under low electron doses, the reconstructions initial error increases when the update strength coefficients are reduced below a certain threshold emphasizing the existence of critical values beyond which the algorithms are trapped in local minima. These findings highlight the need for carefully optimized reconstruction parameters in iterative ptychography, especially when working with low electron doses, ensuring both effective convergence and correctness of the result.
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来源期刊
Ultramicroscopy
Ultramicroscopy 工程技术-显微镜技术
CiteScore
4.60
自引率
13.60%
发文量
117
审稿时长
5.3 months
期刊介绍: Ultramicroscopy is an established journal that provides a forum for the publication of original research papers, invited reviews and rapid communications. The scope of Ultramicroscopy is to describe advances in instrumentation, methods and theory related to all modes of microscopical imaging, diffraction and spectroscopy in the life and physical sciences.
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