Volume 11, Issue 4 e201700141
FULL ARTICLE

Endomicroscopic optical coherence tomography for cellular resolution imaging of gastrointestinal tracts

Yuemei Luo

Yuemei Luo

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Dongyao Cui

Dongyao Cui

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Xiaojun Yu

Xiaojun Yu

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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En Bo

En Bo

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Xianghong Wang

Xianghong Wang

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Nanshuo Wang

Nanshuo Wang

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Cilwyn S. Braganza

Cilwyn S. Braganza

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Shufen Chen

Shufen Chen

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Xinyu Liu

Xinyu Liu

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Qiaozhou Xiong

Qiaozhou Xiong

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Si Chen

Si Chen

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Shi Chen

Shi Chen

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

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Linbo Liu

Corresponding Author

Linbo Liu

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore

Correspondence

Linbo Liu, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore 639798, Singapore. Email: [email protected]

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First published: 08 August 2017
Citations: 15

Abstract

Our ability to detect neoplastic changes in gastrointestinal (GI) tracts is limited by the lack of an endomicroscopic imaging tool that provides cellular-level structural details of GI mucosa over a large tissue area. In this article, we report a fiber-optic-based micro-optical coherence tomography (μOCT) system and demonstrate its capability to acquire cellular-level details of GI tissue through circumferential scanning. The system achieves an axial resolution of 2.48 μm in air and a transverse resolution of 4.8 μm with a depth-of-focus (DOF) of ~150 μm. To mitigate the issue of limited DOF, we used a rigid sheath to maintain a circular lumen and center the distal-end optics. The sensitivity is tested to be 98.8 dB with an illumination power of 15.6 mW on the sample. With fresh swine colon tissues imaged ex vivo, detailed structures such as crypt lumens and goblet cells can be clearly resolved, demonstrating that this fiber-optic μOCT system is capable of visualizing cellular-level morphological features. We also demonstrate that time-lapsed frame averaging and imaging speckle reduction are essential for clearly visualizing cellular-level details. Further development of a clinically viable μOCT endomicroscope is likely to improve the diagnostic outcome of GI cancers.

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