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[2602.21361] Towards single-shot coherent imaging via overlap-free ptychography
Summary
The paper presents a novel approach to single-shot coherent imaging using overlap-free ptychography, enhancing throughput and reducing dose in imaging applications.
Why It Matters
This research addresses a significant limitation in coherent imaging techniques, which often require overlapping scans that can compromise efficiency and increase radiation exposure. By enabling overlap-free imaging, this work has implications for advancements in synchrotron and XFEL imaging, potentially transforming practices in fields such as materials science and biology.
Key Takeaways
- Introduces a framework for overlap-free, single-shot ptychographic imaging.
- Achieves high structural similarity in reconstructions with fewer training images.
- Demonstrates significant throughput improvements over traditional methods.
- Validates findings with experimental data from leading light sources.
- Supports dose-efficient imaging, crucial for sensitive applications.
Physics > Optics arXiv:2602.21361 (physics) [Submitted on 24 Feb 2026] Title:Towards single-shot coherent imaging via overlap-free ptychography Authors:Oliver Hoidn, Aashwin Mishra, Steven Henke, Albert Vong, Matthew Seaberg View a PDF of the paper titled Towards single-shot coherent imaging via overlap-free ptychography, by Oliver Hoidn and 4 other authors View PDF HTML (experimental) Abstract:Ptychographic imaging at synchrotron and XFEL sources requires dense overlapping scans, limiting throughput and increasing dose. Extending coherent diffractive imaging to overlap-free operation on extended samples remains an open problem. Here, we extend PtychoPINN (O. Hoidn \emph{et al.}, \emph{Scientific Reports} \textbf{13}, 22789, 2023) to deliver \emph{overlap-free, single-shot} reconstructions in a Fresnel coherent diffraction imaging (CDI) geometry while also accelerating conventional multi-shot ptychography. The framework couples a differentiable forward model of coherent scattering with a Poisson photon-counting likelihood; real-space overlap enters as a tunable parameter via coordinate-based grouping rather than a hard requirement. On synthetic benchmarks, reconstructions remain accurate at low counts ($\sim\!10^4$ photons/frame), and overlap-free single-shot reconstruction with an experimental probe reaches amplitude structural similarity (SSIM) 0.904, compared with 0.968 for overlap-constrained reconstruction. Against a data-saturated supervised model with the same backb...