167 research outputs found
Creating Characters and Constructing Their Motives in Controversiae
本研究はJSPS科研費18K12619の助成を受けたものです
Parallel phase-shifting digital holographic microscopy
We propose parallel phase-shifting digital holographic microscopy (PPSDHM) which has the ability of three-dimensional (3-D) motion measurement using space-division multiplexing technique. By the PPSDHM, instantaneous information of both the 3-D structure and the phase distributions of specimens can be simultaneously acquired with a single-shot exposure. We constructed a parallel phase-shifting digital holographic microscope consisting of an optical interferometer and an image sensor on which micro polarizers are attached pixel by pixel. The validity of the PPSDHM was experimentally verified by demonstrating the single-shot 3-D imaging and phase-imaging ability of the constructed microscope
Multi-Physical Parameter Cross-Sectional Imaging of Quantitative Phase and Fluorescence by Integrated Multimodal Microscopy
Integrated multimodal cross-sectional or volumetric
imaging techniques give us fruitful information to understand the
behavior or status of target objects such as biological samples. Most
of the reported systems for this purpose are either time consuming
due to scanning or use additional reference beams such as in
interferometry. Therefore, fast, simple, highly efficient, and powerful multimodal imaging systems that can perform cross-sectional
imaging with simple algorithms are worth to be investigated. In
this paper, a multimodal technique for cross-sectional quantitative
phase and fluorescence imaging with computational microscopy
is presented. We combine cross-sectional fluorescence and quantitative phase imaging by using the transport of intensity equation
(TIE) and numerical wave propagation. The amplitude and phase
of the fluorescence light wave with partially spatial coherence are
obtained from three defocused intensity patterns. The proposed
hybrid imaging system is simple, compact, and non-iterative. We
present experimental results of microbeads and fluorescent proteinlabeled living cells of the moss Physcomitrella patensto demonstrate
the performance of the proposed imaging system
Three-dimensional fluorescence imaging using the transport of intensity equation
We propose a nonscanning three-dimensional (3-D) fluorescence imaging technique using the transport of intensity equation (TIE) and free-space Fresnel propagation. In this imaging technique, a phase distribution corresponding to defocused fluorescence images with a point-light-source-like shape is retrieved by a TIE-based phase retrieval algorithm. From the obtained phase distribution, and its corresponding amplitude distribution, of the defocused fluorescence image, various images at different distances can be reconstructed at the desired plane after Fresnel propagation of the complex wave function. Through the proposed imaging approach, the 3-D fluorescence imaging can be performed in multiple planes. The fluorescence intensity images are captured with the help of an electrically tunable lens; hence, the imaging technique is free from motion artifacts. We present experimental results corresponding to microbeads and a biological sample to demonstrate the proposed 3-D fluorescence imaging technique
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