Fast isotropic quantitative differential phase contrast microscopy using radially asymmetric color pupil

Yu-Hsiang Lin; An-Cin Li; Ying-Ju Chen; Yuan Luo

doi:10.1117/12.2615917

27 October 2021 Fast isotropic quantitative differential phase contrast microscopy using radially asymmetric color pupil

Yu-Hsiang Lin, An-Cin Li, Ying-Ju Chen, Yuan Luo

Author Affiliations +

Proceedings Volume 11925, Biomedical Imaging and Sensing Conference 2021; 119251J (2021) https://doi.org/10.1117/12.2615917
Event: SPIE Technologies and Applications of Structured Light, 2021, Online, Japan

Abstract

Differential phase contrast microscopy based on twelve-axis measurements of half-circle pupil acquires isotropic phase information but suffers with poor imaging speed. We proposed a new method by modulating illumination pattern to realize isotropic PTF within three-axis measurements. Not only provide phase information reconstruction under isotropic phase transfer function in fast imaging speed but also avoid particular imaging issue including motion-blur and lowillumination images. By modulate illumination pattern with programmable thin-fin-transistor(TFT) panel as digital pupil, we design radially asymmetric pupil to achieve isotropic PTF within three-axis measurements. To further improve imaging speed, wavelength-multiplexing approach is implemented by color camera. By pupil engineering, 12-times imaging speed improvement compared with twelve-axis measurements of half-circle pupil is attained. Color-leakage, which is the cross-talk under wavelength-multiplexing, was already calibrated by color-leakage correction as well. Meanwhile, accuracy of phase recover reach 97% by using 10μm polystyrene microspheres to guarantee correct result. In our method, color radially asymmetric pupil based on pupil engineering provide lots superiority including high imaging speed, measurement under isotropic phase transfer function, high accuracy of phase recover and immune from imaging issue such as motion-blur and low-illumination images.

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Yu-Hsiang Lin, An-Cin Li, Ying-Ju Chen, and Yuan Luo "Fast isotropic quantitative differential phase contrast microscopy using radially asymmetric color pupil", Proc. SPIE 11925, Biomedical Imaging and Sensing Conference 2021, 119251J (27 October 2021); https://doi.org/10.1117/12.2615917

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KEYWORDS

Microscopy

Phase contrast

Microscopes

Phase transfer function

Cameras

Objectives

Inverse problems

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