Dynamic gradient optimization position correction method in ptychography

作者：Mengnan Liu, Yu Han, Xiaoqi Xi, Qi Zhong, Liyang Zhang, Lei Li, Zijian Xu, Xiangzhi Zhang, Bin Yan · 发表于：Applied Optics · 年份：2025 · DOI：10.1364/ao.547652 · 被引用次数：3 · 研究领域：Advanced X-ray Imaging Techniques、Advanced X-ray and CT Imaging、Astrophysical Phenomena and Observations

Coherent diffraction imaging (CDI) overcomes the limitation of the optical component fabrication technology on imaging resolution. Ptychography, an important variant of CDI, can reconstruct the complex transmission of the object through a series of diffraction patterns, while providing a large field of view with a high resolution. However, the accuracy of the scan positions has a significant effect on the image quality of the ptychography. Herein, the translation parameters are dynamically and adaptively adjusted by the gradient optimization algorithms within the extended ptychographic iterative engine. Six advanced gradient optimization algorithms are evaluated through simulations. The results show that they can achieve subpixel correction accuracy. In addition, the method is tested on an experimental ptychography dataset using soft X-ray, which also verifies its capability for reconstruction improvement.