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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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Thapa P, Singh V, Bhatt S, Tayal S, Mann P, Maurya K, Mishra D, Mehta DS. Development of multimodal micro-endoscopic system with oblique illumination for simultaneous fluorescence imaging and spectroscopy of oral cancer. J Biophotonics 2022; 15:e202100284. [PMID: 34978385 DOI: 10.1002/jbio.202100284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 09/08/2021] [Revised: 12/10/2021] [Accepted: 12/29/2021] [Indexed: 06/14/2023]
Abstract
Multimodality of an optical system implies the use of one or more optical techniques to improve the system's overall performance and maximum utility. In this article, we demonstrate a multimodal system with oblique illumination that combines two different techniques; fluorescence micro-endoscopy and spectroscopy simultaneously and can be utilized to obtain diverse information from the same location of biological sample. In present system, use of graded index (GRIN) rod-lens makes it highly compact and oblique incidence decouples illumination geometry with collection geometry, preventing CCD cameras from saturation and reduces number of optical elements, thereby making system further miniaturized and field-portable. It also overcomes the disadvantages of undesired reflections from different optical elements. The experimental results of simultaneous imaging and spectroscopy of the biological samples are presented along with quantitative spectroscopic parameters; peak wavelength shift, area under the curve and full width half maximum (FWHM). The spatial resolution, spectral resolution and field of view of the system are found to be 4.38 μm, 0.5 nm and 2.071×1.548mm2 , respectively. Furthermore, we have obtained the red shift for cancerous oral tissue with respect to normal oral tissue 5.79 ± 1.071 nm. This could be important indicator for oral cancer screening.
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Affiliation(s)
- Pramila Thapa
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
| | - Veena Singh
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
| | - Sunil Bhatt
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
| | - Shilpa Tayal
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
| | - Priyanka Mann
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
| | - Kiran Maurya
- Department of Oral Pathology and Microbiology, Center for Dental Education & Research, All India Institute of Medical Sciences, New Delhi, India
| | - Deepika Mishra
- Department of Oral Pathology and Microbiology, Center for Dental Education & Research, All India Institute of Medical Sciences, New Delhi, India
| | - Dalip Singh Mehta
- Bio-photonics and Green-photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
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Matalia JH, Rajput VK, Matalia H, Shetty BK. Endoilluminator-assisted pediatric cataract surgery with hazy cornea. Indian J Ophthalmol 2018; 66:1198-1200. [PMID: 30038181 PMCID: PMC6080437 DOI: 10.4103/ijo.ijo_1180_17] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The purpose of this study was to demonstrate the usefulness of endoilluminator in pediatric cataract with hazy corneas. We describe a series of three cases of pediatric cataract where visualization of intraocular structures was inadequate under the operating microscope. The endoilluminator was held at the limbus with light directed obliquely to visualize the details of intraocular structures against the hazy cornea using oblique illumination. It allowed structures behind the hazy cornea to be seen with ease. A simple modification in surgical procedure of pediatric cataract using an endoilluminator helps in better visualization of intraocular structures in difficult situations.
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Affiliation(s)
- Jyoti Himanshu Matalia
- Department of Pediatric Ophthalmology and Neuro-Ophthalmology, Narayana Nethralaya-2, Bengaluru, Karnataka, India
| | - Vimal Krishna Rajput
- Department of Pediatric Ophthalmology and Neuro-Ophthalmology, Narayana Nethralaya-2, Bengaluru, Karnataka, India
| | - Himanshu Matalia
- Department of Cornea and Refractive Surgery, Narayana Nethralaya-2, Bengaluru, Karnataka, India
| | - Bhujang K Shetty
- Department of Cataract, Narayana Nethralaya-2, Bengaluru, Karnataka, India
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Hsu HC, Li L, Yao J, Wong TTW, Shi J, Chen R, Zhou Q, Wang LV. Dual-axis illumination for virtually augmenting the detection view of optical-resolution photoacoustic microscopy. J Biomed Opt 2018; 23:1-7. [PMID: 29981225 PMCID: PMC8357328 DOI: 10.1117/1.jbo.23.7.076001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 06/08/2018] [Indexed: 05/19/2023]
Abstract
Optical-resolution photoacoustic microscopy (OR-PAM) has demonstrated fast, label-free volumetric imaging of optical-absorption contrast within the quasiballistic regime of photon scattering. However, the limited numerical aperture of the ultrasonic transducer restricts the detectability of the photoacoustic waves, thus resulting in incomplete reconstructed features. To tackle the limited-view problem, we added an oblique illumination beam to the original coaxial optical-acoustic scheme to provide a complementary detection view. The virtual augmentation of the detection view was validated through numerical simulations and tissue-phantom experiments. More importantly, the combination of top and oblique illumination successfully imaged a mouse brain in vivo down to 1 mm in depth, showing detailed brain vasculature. Of special note, it clearly revealed the diving vessels that were long missing in images from original OR-PAM.
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Affiliation(s)
- Hsun-Chia Hsu
- Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, St. Louis, Missouri, United States
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Lei Li
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Junjie Yao
- Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, St. Louis, Missouri, United States
| | - Terence T. W. Wong
- Washington University in St. Louis, Department of Biomedical Engineering, Optical Imaging Laboratory, St. Louis, Missouri, United States
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Junhui Shi
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
| | - Ruimin Chen
- University of Southern California, Resource Center for Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Qifa Zhou
- University of Southern California, Resource Center for Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, Los Angeles, California, United States
| | - Lihong V. Wang
- California Institute of Technology, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, Caltech Optical Imaging Laboratory, Pasadena, California, United States
- Address all correspondence to: Lihong V. Wang, E-mail:
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Ruiz-Santaquiteria J, Espinosa-Aranda JL, Deniz O, Sanchez C, Borrego-Ramos M, Blanco S, Cristobal G, Bueno G. Low-cost oblique illumination: an image quality assessment. J Biomed Opt 2018; 23:1-14. [PMID: 29297212 DOI: 10.1117/1.jbo.23.1.016001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 06/22/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Abstract
We study the effectiveness of several low-cost oblique illumination filters to improve overall image quality, in comparison with standard bright field imaging. For this purpose, a dataset composed of 3360 diatom images belonging to 21 taxa was acquired. Subjective and objective image quality assessments were done. The subjective evaluation was performed by a group of diatom experts by psychophysical test where resolution, focus, and contrast were assessed. Moreover, some objective nonreference image quality metrics were applied to the same image dataset to complete the study, together with the calculation of several texture features to analyze the effect of these filters in terms of textural properties. Both image quality evaluation methods, subjective and objective, showed better results for images acquired using these illumination filters in comparison with the no filtered image. These promising results confirm that this kind of illumination filters can be a practical way to improve the image quality, thanks to the simple and low cost of the design and manufacturing process.
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Affiliation(s)
| | | | - Oscar Deniz
- University of Castilla-La Mancha, ETSI Industriales, Visilab, Ciudad Real, Spain
| | - Carlos Sanchez
- Institute of Optics "Daza de Valdés", Spanish National Research Council (CSIC), Madrid, Spain
| | | | - Saul Blanco
- University of León, Institute of Environment, León, Spain
| | - Gabriel Cristobal
- Institute of Optics "Daza de Valdés", Spanish National Research Council (CSIC), Madrid, Spain
| | - Gloria Bueno
- University of Castilla-La Mancha, ETSI Industriales, Visilab, Ciudad Real, Spain
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