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Shao M, Wang K, Wang Z, Peng T, Zhang S, Zhang J, Fang S, Wang F, Zhang S, Zhong MC, Wang Y, Zhong Z, Zhou J. An apparatus for qualitative assessment of the shading ratio of oblique illumination and real-time high-contrast imaging. J Biophotonics 2022; 15:e202200122. [PMID: 36029217 DOI: 10.1002/jbio.202200122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/30/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Oblique illumination imaging can significantly improve the contrast of transparent thin samples. However, in traditional oblique illumination methods, either the condenser is offset or a block is added to the condenser, which makes it complicated and challenged to build a stable oblique illumination imaging. Herein, we present a method to measure the optimal shading ratio of oblique illumination in an inverted microscope, and develop an apparatus for stable high-speed high-contrast imaging with uniform brightness. At optimal shading ratio, the oblique illumination imaging has better imaging quality than differential interference contrast, which characteristic is independent on sample. In oblique illumination with low magnification objective, the images have uneven brightness. According to target brightness, we have developed a brightness unevenness correction algorithm to form uniform background brightness for oblique illumination. Integrating the algorithm with imaging acquisition, corrected oblique illumination microscopy is appropriate to observe living cells with high contrast.
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Affiliation(s)
- Meng Shao
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
- School of Instrument Science and Opto-Electronic Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Ke Wang
- School of Life Science, Anhui Medical University, Hefei, Anhui, China
| | - Zixin Wang
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Tao Peng
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Shuhe Zhang
- University Eye Clinic Maastricht, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Juanlin Zhang
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Shu Fang
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Fengsong Wang
- School of Life Science, Anhui Medical University, Hefei, Anhui, China
| | - Shengzhao Zhang
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Min-Cheng Zhong
- School of Instrument Science and Opto-Electronic Engineering, Hefei University of Technology, Hefei, Anhui, China
| | - Yi Wang
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Zhensheng Zhong
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
| | - Jinhua Zhou
- School of Biomedical Engineering, Anhui Medical University, Hefei, Anhui, China
- Anhui Provincial Institute of Translational Medicine, Anhui Medical University, Hefei, Anhui, China
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