Prof. Woo June Choi Profile

Prof. Woo June Choi

Associate Professor at Chung-Ang Univ

SPIE Involvement:

Author

Publications (40)

Proceedings Article | 13 March 2024 Poster + Paper

Multi-focal lens holographic optical element-based waveguide-type display for extended depth of field

Seong-Hyeon Cho, Jae-Sang Lee, Woo June Choi, Young-Wan Choi

Proceedings Volume 12910, 129100M (2024) https://doi.org/10.1117/12.3002544

KEYWORDS: Holographic optical elements, Augmented reality, Depth of field, Holographic displays, Waveguides, Photomasks, Head-mounted displays

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Proceedings Article | 15 March 2023 Poster + Paper

Optical switch combined Raman spectroscopy for rapid SERS measurements

Seung-Jin Lee, Jae-Sang Lee, Young-Wan Choi, Woo June Choi

Proceedings Volume 12363, 1236307 (2023) https://doi.org/10.1117/12.2647230

KEYWORDS: Raman spectroscopy, Surface enhanced Raman spectroscopy, Optical switching, Signal detection, Raman scattering

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Proceedings Article | 14 March 2023 Poster + Paper

Compact imaging system based on multi-variable focal lens system in AR display

Jae-Sang Lee, Seong-Hyeon Cho, Seung-jin Lee, Woo June Choi, Young-Wan Choi

Proceedings Volume 12443, 124430F (2023) https://doi.org/10.1117/12.2648207

KEYWORDS: Augmented reality, Imaging systems, Lenses, Numerical simulations, Depth of field, Image sharpness, Image resolution, Head-mounted displays, Fourier transforms, Spatial light modulators

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SPIE Journal Paper | 27 May 2022

Multi-variable focal lens system for extended depth of field in augmented reality display

Jae-Sang Lee, Su-Jin Jeon, Yong-Jin Kim, Hyung-Soo Kim, Woo June Choi, Young-Wan Choi

OE, Vol. 61, Issue 05, 053102, (May 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.5.053102

KEYWORDS: Augmented reality, Eye, Focus stacking, Autoregressive models, Projection systems, CCD cameras, Optical engineering, Visualization, LCDs, Image resolution

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Proceedings Article | 2 March 2022 Presentation + Paper

Deep learning enables accelerated optical coherence tomography angiography

Gyuwon Kim, Jongbeom Kim, Woo June Choi, Chulhong Kim, Seungchul Lee

Proceedings Volume 11971, 1197108 (2022) https://doi.org/10.1117/12.2609303

KEYWORDS: Angiography, Optical coherence tomography, Super resolution, In vivo imaging, Resolution enhancement technologies

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Proceedings Article | 9 December 2021 Paper

Multimodal preclinical imaging system using transparent ultrasonic transducer

Jeongwoo Park, Byullee Park, Tae Yeong Kim, Sungjin Jung, Woo June Choi, Joongho Ahn, Uijung Yong, Jinah Jang, Won Jong Kim, Hong Kyun Kim, Unyong Jeong, Hyung Ham Kim, Chulhong Kim

Proceedings Volume 11923, 119230I (2021) https://doi.org/10.1117/12.2615887

KEYWORDS: Imaging systems, Optical coherence tomography, Multimodal imaging, Transducers, Ultrasonography, Ultrasonics, Preclinical imaging, Skin, System integration, Optical imaging

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Proceedings Article | 14 March 2018 Presentation

wide-field and long-ranging-depth optical coherence tomography microangiography of human oral mucosa (Conference Presentation)

Wei Wei, Woo June Choi, Shaojie Men, Shaozhen Song, Ruikang Wang

Proceedings Volume 10473, 104730H (2018) https://doi.org/10.1117/12.2290685

KEYWORDS: Optical coherence tomography, Tissues, Imaging systems, Capillaries, Ranging, Visualization, Biopsy, Angiography, Endoscopy, Microscopy

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Proceedings Article | 14 March 2018 Presentation

OCT Eigen decompensation based penetrating vessel mapping (Conference Presentation)

Wei Wei, Yuandong Li, Woo June Choi, Ruikang Wang

Proceedings Volume 10493, 104930F (2018) https://doi.org/10.1117/12.2290866

KEYWORDS: Cerebral cortex, Natural surfaces, Tissues, Alzheimer's disease, Particles, Optical coherence tomography, Angiography, Statistical analysis, Bridges, Molecular bridges

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Penetrating vessels bridge the mesh of communicating vessels on the surface of cortex with the subsurface microvascular bed that feeds the underlying neural tissue. The degeneration and dysfunction of penetrating vessels directly relates to Alzheimer’s disease, perceptual deficit, amnestic syndrome and stroke. Here we propose a cerebral penetrating vessel mapping approach based on eigen decompensation (ED) principle component analysis that is innovatively redesigned from optical coherence tomography (OCT) angiography. Ensemble complex OCT signals acquired through repeated A-scans first form a covariance matrix and then project into an eigenspace to represent frequency components of moving particles. The eigen representation of signals possesses several advantages over that in spatiotemporal domain: 1) the eigen components possess distinct statistical distributions for penetrating vessels, surface communicating vessels, vessel free regions, and territories occupied by enriched capillaries; 2) this approach is immune to tailing artifacts, enabling automatic decoupling of penetrating vessels from lateral vasculature networks. To describe the uniqueness of penetrating vessels as 2D parameter mapping, a second round of eigen analysis is applied to the eigen representations by taking each eigen component as an observation and distributions of the eigen components as features. In our datasets of mouse cerebral cortex, the eigen components mainly follow a subtle logistic distribution, statistically more significant than other features in terms of distribution spectral power (> 30 dB). While, the existence of vessel penetrating behavior locally breaks this distribution, assigning low transform probabilities to corresponding A-scans. Therefore, the transform coefficients inversely correlate to the vessel penetration and fully reveal the spatial morphology of penetrating vessels from projection view. This method allows for automatic statistical quantification of penetrating arterioles and ascending venules from large volume OCT angiography data, and accordingly contributes to the morphometric analysis of cortical microvasculature in functioning brains.

Proceedings Article | 14 March 2018 Presentation

OCT angiography reveals age-related differences in cerebral blood flow of anesthetized mice (Conference Presentation)

Woo June Choi, Yuandong Li, Wei Wei, Ruikang Wang

Proceedings Volume 10493, 104930J (2018) https://doi.org/10.1117/12.2291096

KEYWORDS: Capillaries, Angiography, Optical coherence tomography, Cerebral blood flow, Blood, Tomography, Brain, Pathology, Sensors, Functional imaging

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Proceedings Article | 19 February 2018 Paper

Why choroid vessels appear dark in clinical OCT images

Mitchell Kirby, Chenxi Li, Woo June Choi, Giovanni Gregori, Philip Rosenfeld, Ruikang Wang

Proceedings Volume 10474, 1047428 (2018) https://doi.org/10.1117/12.2291057

KEYWORDS: Optical coherence tomography, Scattering, Light scattering, Finite-difference time-domain method, Blood, Tissues, Blood vessels, Tissue optics, Mie scattering, Angiography

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Proceedings Article | 19 April 2017 Presentation

Using OCT-based microangiography for in vivo longitudinal study of arteriogenesis (Conference Presentation)

Yuandong Li, Woo June Choi, Ruikang Wang

Proceedings Volume 10063, 100630F (2017) https://doi.org/10.1117/12.2253285

KEYWORDS: Cerebral cortex, Arteries, Blood circulation, Animal model studies, Image processing, In vivo imaging, Blood, Tissues, Ischemia, Vascular diseases

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Proceedings Article | 19 April 2017 Presentation

Characterization of relationship between optical microangiography OMAG signal and blood flow (Conference Presentation)

Woo June Choi, Wan Qin, Chieh-Li Chen, Jingang Wang, Qinqin Zhang, Ruikang Wang

Proceedings Volume 10063, 100630S (2017) https://doi.org/10.1117/12.2253596

KEYWORDS: Biomedical optics, Optical coherence tomography, Angiography, Particles, Blood circulation, Visualization, In vivo imaging, Light sources, Numerical simulations, Microfluidics

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Proceedings Article | 27 April 2016 Presentation

Optical coherence tomography based microangiography: A tool good for dermatology applications (Conference Presentation)

Ruikang Wang, Utku Baran, Woo Choi

Proceedings Volume 9689, 96890L (2016) https://doi.org/10.1117/12.2217625

KEYWORDS: Optical coherence tomography, Dermatology, Visualization, Blood circulation, Tissue optics, In vivo imaging, Image resolution, Skin, Pathology, Wound healing

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Proceedings Article | 26 April 2016 Presentation

Mapping transverse capillary flow speed using time-varying OCT speckle signals (Conference Presentation)

Woo June Choi, Ruikang Wang

Proceedings Volume 9707, 970707 (2016) https://doi.org/10.1117/12.2214001

KEYWORDS: Optical coherence tomography, Capillaries, Speckle, 3D modeling, Blood, Velocimetry, Statistical analysis, Binary data, 3D image processing, In vivo imaging

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Proceedings Article | 9 March 2016 Presentation + Paper

Optical microangiography enabling visualization of change in meninges after traumatic brain injury in mice in vivo

Woo June Choi, Wan Qin, Xiaoli Qi, Ruikang Wang

Proceedings Volume 9690, 96901I (2016) https://doi.org/10.1117/12.2213988

KEYWORDS: Traumatic brain injury, Brain, In vivo imaging, Pathophysiology, Neuroimaging, Optical coherence tomography, Surgery, Veins

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Proceedings Article | 8 March 2016 Paper

Automated detection of inflammatory cells in whole anterior chamber of a uveitis mouse from swept-source optical coherence tomography images

Woo June Choi, Kathryn Pepple, Ruikang Wang

Proceedings Volume 9697, 969739 (2016) https://doi.org/10.1117/12.2214831

KEYWORDS: Optical coherence tomography, 3D image processing, Inflammation, Pre-clinical research, Ions, In vivo imaging, Iris recognition, Mouse models

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Proceedings Article | 29 February 2016 Paper

Towards the use of OCT angiography in clinical dermatology

Utku Baran, Woo June Choi, Ruikang Wang

Proceedings Volume 9689, 96890O (2016) https://doi.org/10.1117/12.2214493

KEYWORDS: Skin, Optical coherence tomography, Dermatology, Tissue optics, Visualization, In vivo imaging, Angiography, Wound healing, Biopsy, Optical inspection, Image resolution, Chest

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SPIE Journal Paper | 8 October 2015 Open Access

Swept-source optical coherence tomography powered by a 1.3-μm vertical cavity surface emitting laser enables 2.3-mm-deep brain imaging in mice in vivo

Woo June Choi, Ruikang Wang

JBO, Vol. 20, Issue 10, 106004, (October 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.10.106004

KEYWORDS: Optical coherence tomography, Brain, Vertical cavity surface emitting lasers, Neuroimaging, Cranial windows, Imaging systems, Brain imaging, In vivo imaging, Tissues, Cerebral cortex

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Proceedings Article | 20 March 2015 Paper

Characterization of rat model of acute anterior uveitis using optical coherence tomography angiography

Woo June Choi, Kathryn Pepple, Zhongwei Zhi, Ruikang Wang

Proceedings Volume 9307, 93071Z (2015) https://doi.org/10.1117/12.2080484

KEYWORDS: Optical coherence tomography, Image segmentation, Inflammation, Iris, Eye, Angiography, Eye models, Cornea, Tissues, Iris recognition

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Proceedings Article | 6 March 2015 Paper

In vivo monitoring of external pressure induced hemodynamics in skin tissue using optical coherence tomography angiography

Woo June Choi, Hequn Wang, Ruikang Wang

Proceedings Volume 9327, 93270A (2015) https://doi.org/10.1117/12.2080527

KEYWORDS: Optical coherence tomography, Tissues, Skin, Angiography, Capillaries, Glasses, In vivo imaging, Tissue optics, Blood, 3D image processing

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Proceedings Article | 5 March 2015 Paper

In vivo imaging of microvascular changes in inflammatory human skin induced by tape stripping and mosquito saliva using optical microangiography

Utku Baran, Woo J. Choi, Ruikang Wang

Proceedings Volume 9322, 93220N (2015) https://doi.org/10.1117/12.2082722

KEYWORDS: Skin, Inflammation, In vivo imaging, Tissue optics, Optical coherence tomography, Blood, Visualization, Tissues, Microfluidic imaging, Microfluidics

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Proceedings Article | 2 March 2015 Paper

In vivo microvascular imaging of human oral and nasal cavities using swept-source optical coherence tomography with a single forward/side viewing probe

Woo June Choi, Ruikang Wang

Proceedings Volume 9312, 93121C (2015) https://doi.org/10.1117/12.2081103

KEYWORDS: Optical coherence tomography, Tissues, Imaging systems, 3D image processing, In vivo imaging, Blood, Head, Capillaries, Image resolution, Angiography

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Proceedings Article | 26 February 2015 Paper

Microvascular changes during acne lesion initiation and scarring within human skin is revealed in vivo using optical microangiography

Utku Baran, Yuandong Li, Woo Choi, Ruikang Wang

Proceedings Volume 9303, 93030J (2015) https://doi.org/10.1117/12.2082717

KEYWORDS: Skin, In vivo imaging, Tissue optics, Optical coherence tomography, 3D image processing, Tissues, Imaging systems, Inflammation, Clinical trials, Image resolution

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SPIE Journal Paper | 16 January 2015 Open Access

Optical coherence tomography based microangiography for quantitative monitoring of structural and vascular changes in a rat model of acute uveitis in vivo: a preliminary study

Woo June Choi, Kathryn Pepple, Zhongwei Zhi, Ruikang Wang

JBO, Vol. 20, Issue 01, 016015, (January 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.1.016015

KEYWORDS: Optical coherence tomography, Iris, Inflammation, Image segmentation, Eye models, Eye, In vivo imaging, Iris recognition, Angiography, Animal model studies

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SPIE Journal Paper | 9 September 2014 Open Access

Light-guided localization within tissue using biocompatible surgical suture fiber as an optical waveguide

Woo June Choi, Kwan Seob Park, Byeong Ha Lee

JBO, Vol. 19, Issue 09, 090503, (September 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.9.090503

KEYWORDS: Tissue optics, Breast, Waveguides, Cladding, Surgery, Tissues, Laser tissue interaction, Biomedical optics, Fiber couplers, Soft tissue optics

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SPIE Journal Paper | 8 May 2014 Open Access

Optical coherence tomography microangiography for monitoring the response of vascular perfusion to external pressure on human skin tissue

Woo June Choi, Hequn Wang, Ruikang Wang

JBO, Vol. 19, Issue 05, 056003, (May 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.5.056003

KEYWORDS: Optical coherence tomography, Tissues, Skin, Capillaries, 3D image processing, Tissue optics, Blood circulation, In vivo imaging, Angiography, Glasses

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SPIE Journal Paper | 12 March 2014 Open Access

Improved microcirculation imaging of human skin in vivo using optical microangiography with a correlation mapping mask

Woo June Choi, Roberto Reif, Siavash Yousefi, Ruikang Wang

JBO, Vol. 19, Issue 03, 036010, (March 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.3.036010

KEYWORDS: Optical coherence tomography, Skin, Tissues, Tissue optics, In vivo imaging, Microcirculation imaging, Biomedical optics, Binary data, 3D image processing, Imaging systems

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Proceedings Article | 20 February 2014 Paper

Detection of nanoscale defects in optical films by photothermal reflectance microscopy

Ki Soo Chang, Woo June Choi, Dong Uk Kim, Jun Ki Kim

Proceedings Volume 8963, 896313 (2014) https://doi.org/10.1117/12.2038930

KEYWORDS: Reflectivity, Microscopy, Modulation, Defect detection, Signal detection, CCD cameras, Homodyne detection, Reflection, Charge-coupled devices, Absorption

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SPIE Journal Paper | 28 October 2013 Open Access

Single-camera polarization-sensitive full-field optical coherence tomography with polarization switch

Kwan Seob Park, Woo June Choi, Tae Joong Eom, Byeong Ha Lee

JBO, Vol. 18, Issue 10, 100504, (October 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.10.100504

KEYWORDS: Optical coherence tomography, Polarization, CCD cameras, Switches, Switching, Imaging systems, Charge-coupled devices, Linear polarizers, Ferroelectric materials, Light sources

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Proceedings Article | 22 February 2013 Paper

Polarization sensitive full-field optical coherence tomography based on bi-stable polarizaton switch

Kwan Seob Park, Woo June Choi, Tae Joong Eom, Jae Hun Kim, Deok Ha Woo, Byeong Ha Lee

Proceedings Volume 8589, 85891D (2013) https://doi.org/10.1117/12.2003805

KEYWORDS: Polarization, CCD cameras, Optical coherence tomography, Switches, Imaging systems, Ferroelectric materials, Phase shift keying, Signal detection, Modulation, Image resolution

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Proceedings Article | 17 October 2012 Paper

Optical coherence tomography and optical smart sensing

Byeong Ha Lee, Woo June Choi, Eun Jung Min, Kwan Seob Park, Young Ho Kim

Proceedings Volume 8421, 84210E (2012) https://doi.org/10.1117/12.975269

KEYWORDS: Optical coherence tomography, Imaging systems, Surface finishing, Chemical mechanical planarization, Polishing, 3D image reconstruction, Semiconducting wafers, Radium, Image resolution, Beam splitters

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SPIE Journal Paper | 4 April 2012 Open Access

Qualitative investigation of fresh human scalp hair with full-field optical coherence tomography

Woo June Choi, Gihyeon Min, Byeong Ha Lee, Long-Quan Pi, Won-Soo Lee

JBO, Vol. 17, Issue 03, 036010, (April 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.3.036010

KEYWORDS: Optical coherence tomography, 3D image processing, Biomedical optics, Microscopes, Transmission electron microscopy, Imaging systems, Infrared imaging, Tomography, Interferometers, In vivo imaging

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Proceedings Article | 3 February 2012 Paper

Full-field OCT combined with optical tweezer

Woo June Choi, Kwan Seob Park, Tae Joong Eom, Myung-Kyu Oh, Byeong-Ha Lee

Proceedings Volume 8227, 82271J (2012) https://doi.org/10.1117/12.908380

KEYWORDS: Optical coherence tomography, Optical tweezers, Imaging systems, Microscopes, Molybdenum, Interferometers, Particles, Point spread functions, Multichannel imaging systems, Coherence (optics)

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Proceedings Article | 23 February 2011 Paper

Correction of defocused images in full-field optical coherence tomography using digital holography

Gihyeon Min, Ju Wan Kim, Woo June Choi, Byeong Ha Lee

Proceedings Volume 7904, 79041M (2011) https://doi.org/10.1117/12.874365

KEYWORDS: Digital holography, Optical coherence tomography, Image resolution, Imaging systems, Objectives, Image processing, Holography, Charge-coupled devices, Mirrors, Biomedical optics

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Proceedings Article | 26 February 2010 Paper

Tomographic imaging system using digital holographic technique based on integrating four buckets phase shifting interferometry

Gihyeon Min, Ju Wan Kim, Woo Jun Choi, Eun Seo Choi, Byeong Ha Lee

Proceedings Volume 7568, 756824 (2010) https://doi.org/10.1117/12.841683

KEYWORDS: Digital holography, Optical coherence tomography, Tomography, Imaging systems, Holograms, 3D image reconstruction, Holography, Charge-coupled devices, Microscopy, Mirrors

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Proceedings Article | 4 March 2009 Paper

Thickness and index measurements of a transparent specimen by full-field optical coherence microscopy

Jihoon Na, Woo June Choi, Hae Young Choi, Seon Young Ryu, Eun Seo Choi, Byeong Ha Lee

Proceedings Volume 7184, 71841B (2009) https://doi.org/10.1117/12.808971

KEYWORDS: Refractive index, Epoxies, Glasses, Optical coherence tomography, Imaging systems, 3D image processing, Mirrors, Ferroelectric materials, Optical coherence microscopy, CCD cameras

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Proceedings Article | 23 February 2009 Paper

Stroboscopic wide-field optical coherence gated imaging

Woo June Choi, Jihoon Na, Jonghyun Eom, Byeong Ha Lee

Proceedings Volume 7169, 71691L (2009) https://doi.org/10.1117/12.808917

KEYWORDS: Optical coherence tomography, Charge-coupled devices, Imaging systems, Signal detection, 3D image processing, Interferometers, 3D scanning, Mirrors, Doppler effect, 3D acquisition

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Proceedings Article | 18 February 2008 Paper

All-fiber probe for optical coherence tomography

Seon Young Ryu, Hae Young Choi, Jihoon Na, Woo June Choi, Byeong Ha Lee

Proceedings Volume 6847, 68472L (2008) https://doi.org/10.1117/12.766316

KEYWORDS: Optical coherence tomography, Single mode fibers, Imaging systems, Skin, Image resolution, Optical fibers, Objectives, Optical imaging, Fusion splicing, Distance measurement

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Proceedings Article | 7 February 2007 Paper

Full-field optical coherence tomography image restoration based on Hilbert transformation

Jihoon Na, Woo June Choi, Eun Seo Choi, Seon Young Ryu, Byeong Ha Lee

Proceedings Volume 6429, 64292U (2007) https://doi.org/10.1117/12.702266

KEYWORDS: Optical coherence tomography, Mirrors, Image restoration, Light sources, Imaging systems, 3D image processing, Tungsten, CCD cameras, Image processing, Objectives

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Proceedings Article | 20 February 2006 Paper

Realization of fiber-based OCT system with broadband photonic crystal fiber coupler

Seon Young Ryu, Jihoon Na, Hae Young Choi, Woo Jun Choi, Byeong Ha Lee, Gil-Ho Yang

Proceedings Volume 6079, 60791N (2006) https://doi.org/10.1117/12.648951

KEYWORDS: Optical coherence tomography, Sapphire lasers, Imaging systems, Single mode fibers, Light sources, Photonic crystal fibers, Skin, Eye, Teeth, In vitro testing

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Showing 5 of 40 publications

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