分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： We propose a novel intensity diffraction tomography (IDT) reconstruction algorithm based on the split-step non-paraxial (SSNP) model for recovering the 3D refractive index (RI) distribution of multiple-scattering biological samples. High-quality IDT reconstruction requires high-angle illumination to encode both low- and high- spatial frequency information of the 3D biological sample. We show that our SSNP model can more accurately compute multiple scattering from high-angle illumination compared to paraxial approximation-based multiple-scattering models. We apply this SSNP model to both sequential and multiplexed IDT techniques. We develop a unified reconstruction algorithm for both IDT modalities that is highly computationally efficient and is implemented by a modular automatic differentiation framework. We demonstrate the capability of our reconstruction algorithm on both weakly scattering buccal epithelial cells and strongly scattering live $\textit{C. elegans}$ worms and live $\textit{C. elegans}$ embryos.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
摘要： Fluorescence microscopy is essential to study biological structures and dynamics. However, existing systems suffer from a tradeoff between field-of-view (FOV), resolution, and complexity, and thus cannot fulfill the emerging need of miniaturized platforms providing micron-scale resolution across centimeter-scale FOVs. To overcome this challenge, we developed Computational Miniature Mesoscope (CM$^2$) that exploits a computational imaging strategy to enable single-shot 3D high-resolution imaging across a wide FOV in a miniaturized platform. Here, we present CM$^2$ V2 that significantly advances both the hardware and computation. We complement the 3$\times$3 microlens array with a new hybrid emission filter that improves the imaging contrast by 5$\times$, and design a 3D-printed freeform collimator for the LED illuminator that improves the excitation efficiency by 3$\times$. To enable high-resolution reconstruction across the large imaging volume, we develop an accurate and efficient 3D linear shift-variant (LSV) model that characterizes the spatially varying aberrations. We then train a multi-module deep learning model, CM$^2$Net, using only the 3D-LSV simulator. We show that CM$^2$Net generalizes well to experiments and achieves accurate 3D reconstruction across a $\sim$7-mm FOV and 800-$\mu$m depth, and provides $\sim$6-$\mu$m lateral and $\sim$25-$\mu$m axial resolution. This provides $\sim$8$\times$ better axial localization and $\sim$1400$\times$ faster speed as compared to the previous model-based algorithm. We anticipate this simple and low-cost computational miniature imaging system will be impactful to many large-scale 3D fluorescence imaging applications.
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