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Wu T, Shi H, Zhou X, Liu Y, Wang L, Shi Y, Wang J, Lu Y, Gu X, He C. Full-range depth-encoded swept source polarization sensitive optical coherence tomography. OPTICS EXPRESS 2024; 32:9374-9383. [PMID: 38571173 DOI: 10.1364/oe.510970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 02/09/2024] [Indexed: 04/05/2024]
Abstract
To realize the high sensitivity polarization sensitive optical coherence tomography (PS-OCT) imaging, a fiber-based full-range depth-encoded swept source PS-OCT (SS-PS-OCT) method is proposed. The two OCT images corresponding to the orthogonal polarized input light are located on the high sensitivity imaging region of the opposite sides relative to the zero optical path difference position. The full-range OCT images can be obtained by implementing the spatial phase modulation in the reference arm. The detection sensitivity of the system was measured experimentally to be 67 dB when the imaging depth approaching to 2 mm. The imaging of the biological tissue verifies that the proposed full-range depth-encoded SS-PS-OCT system has the higher detection sensitivity compared with the conventional depth encoded SS-PS-OCT system. Finally, we demonstrated the full-range high sensitivity phase retardation image of the bovine tendon and skin of human fingertip. The fiber-based full-range depth-encoded SS-PS-OCT method can realize the high sensitivity birefringence imaging in the medical diagnosis scenes with the requirements for long imaging range and high detection sensitivity.
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Lee MW, Jang N, Choi N, Yang S, Jeong J, Nam HS, Oh S, Kim K, Hwang D. In Vivo Cellular-Level 3D Imaging of Peripheral Nerves Using a Dual-Focusing Technique for Intra-Neural Interface Implantation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2102876. [PMID: 34845862 PMCID: PMC8787432 DOI: 10.1002/advs.202102876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/09/2021] [Indexed: 06/13/2023]
Abstract
In vivo volumetric imaging of the microstructural changes of peripheral nerves with an inserted electrode could be key for solving the chronic implantation failure of an intra-neural interface necessary to provide amputated patients with natural motion and sensation. Thus far, no imaging devices can provide a cellular-level three-dimensional (3D) structural images of a peripheral nerve in vivo. In this study, an optical coherence tomography-based peripheral nerve imaging platform that employs a newly proposed depth of focus extension technique is reported. A point spread function with the finest transverse resolution of 1.27 µm enables the cellular-level volumetric visualization of the metal wire and microstructural changes in a rat sciatic nerve with the metal wire inserted in vivo. Further, the feasibility of applying the imaging platform to large animals for a preclinical study is confirmed through in vivo rabbit sciatic nerve imaging. It is expected that new possibilities for the successful chronic implantation of an intra-neural interface will open up by providing the 3D microstructural changes of nerves around the inserted electrode.
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Affiliation(s)
- Min Woo Lee
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Namseon Jang
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Nara Choi
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Sungwook Yang
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Jinwoo Jeong
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Hyeong Soo Nam
- Department of Mechanical EngineeringKorea Advanced Institute of Science and TechnologyDaejeon34141Republic of Korea
| | - Sang‐Rok Oh
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
| | - Keehoon Kim
- Department of Mechanical EngineeringPohang University of Science and TechnologyGyeongbuk37673Republic of Korea
| | - Donghyun Hwang
- Center for Intelligent and Interactive RoboticsKorea Institute of Science and TechnologySeoul02792Republic of Korea
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Saleah SA, Seong D, Han S, Wijesinghe RE, Ravichandran NK, Jeon M, Kim J. Integrated Quad-Scanner Strategy-Based Optical Coherence Tomography for the Whole-Directional Volumetric Imaging of a Sample. SENSORS (BASEL, SWITZERLAND) 2021; 21:1305. [PMID: 33670358 PMCID: PMC7918791 DOI: 10.3390/s21041305] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 02/07/2021] [Accepted: 02/08/2021] [Indexed: 01/01/2023]
Abstract
Whole-directional scanning methodology is required to observe distinctive features of an entire physical structure with a three dimensional (3D) visualization. However, the implementation of whole-directional scanning is challenging for conventional optical coherence tomography (OCT), which scans a limited portion of the sample by utilizing unidirectional and bidirectional scanning methods. Therefore, in this paper an integrated quad-scanner (QS) strategy-based OCT method was implemented to obtain the whole-directional volumetry of a sample by employing four scanning arms installed around the sample. The simultaneous and sequential image acquisition capabilities are the conceptual key points of the proposed QS-OCT method, and were implemented using four precisely aligned scanning arms and applied in a complementary way according to the experimental criteria. To assess the feasibility of obtaining whole-directional morphological structures, a roll of Scotch tape, an ex vivo mouse heart, and kidney specimens were imaged and independently obtained tissue images at different directions were delicately merged to compose the 3D volume data set. The results revealed the potential merits of QS-OCT-based whole-directional imaging, which can be a favorable inspection method for various discoveries that require the dynamic coordinates of the whole physical structure.
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Affiliation(s)
- Sm Abu Saleah
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea; (S.A.S.); (D.S.); (S.H.)
| | - Daewoon Seong
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea; (S.A.S.); (D.S.); (S.H.)
| | - Sangyeob Han
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea; (S.A.S.); (D.S.); (S.H.)
- Institute of Biomedical Engineering, School of Medicine, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea
| | - Ruchire Eranga Wijesinghe
- Department of Materials and Mechanical Technology, Faculty of Technology, University of Sri Jayewardenepura, Pitipana, Homagama 10200, Sri Lanka;
| | - Naresh Kumar Ravichandran
- Center for Scientific Instrumentation, Korea Basic Science Institute, 169-148, Gwahak-ro Yuseong-gu, Daejeon 34133, Korea;
| | - Mansik Jeon
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea; (S.A.S.); (D.S.); (S.H.)
| | - Jeehyun Kim
- School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea; (S.A.S.); (D.S.); (S.H.)
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