Prof. Yeh-Chan Ahn Profile

Prof. Yeh-Chan Ahn

at Pukyong National Univ

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 13 March 2024 Poster

Blood flow and depth measurement method based on multi-exposure laser speckle contrast imaging (MELSCI) with 3D-CNN model

Hyun-Seo Park, Yeh-Chan Ahn

Proceedings Volume 12856, 1285607 (2024) https://doi.org/10.1117/12.3000819

KEYWORDS: 3D modeling, Speckle pattern, Laser speckle contrast imaging, Blood, Speckle, Laser scattering, Tissues, Skin, 3D image processing, Red blood cells

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Proceedings Article | 14 March 2018 Presentation

Near-infrared autofluorescence image-guided parathyroid gland mapping in thyroidectomy (Conference Presentation)

Kang-Dae Lee, Sung Won Kim, Hyoung Shin Lee, Seok Jeong, Chulho Oak, Yikeun Kim, Yeh-Chan Ahn

Proceedings Volume 10469, 1046916 (2018) https://doi.org/10.1117/12.2287994

KEYWORDS: Near infrared, Surgery, Eye, Optical inspection, Infrared imaging, Auto-fluorescence imaging, Photography, Tissues

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Proceedings Article | 14 February 2018 Paper

Investigation in clinical potential of polarization sensitive optical coherence tomography in laryngeal tumor model study

Xin Zhou, Chulho Oak, Yeh-Chan Ahn, Sung Won Kim, Shuo Tang

Proceedings Volume 10483, 1048339 (2018) https://doi.org/10.1117/12.2292021

KEYWORDS: Tissues, Tumors, Birefringence, Collagen, Optical coherence tomography, Cancer, Phase measurement, Polarization, Optical fibers, Tissue optics

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Proceedings Article | 17 February 2017 Paper

Observation of chest tumor using diffuse optical spectroscopy: time-varying Indocyanine green concentration in rabbit model

Yikeun Kim, Sehun Kim, Sungwon Kim, Haeyoung Lee, Chulho Oak, Yeh-Chan Ahn

Proceedings Volume 10059, 1005923 (2017) https://doi.org/10.1117/12.2251665

KEYWORDS: Diffuse optical spectroscopy, Indocyanine green, Tissue optics, Tissues, Near infrared, Sensors, Skin, Tumors, Laparoscopy, Cancer, Absorption, Near infrared spectroscopy

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SPIE Journal Paper | 1 July 2013 Open Access

New model of subconjunctival tumor development in rabbits

Sang Seok Hwang, Jeong Eun Kim, Bong-Kwon Chun, Sangbong Jung, Eun-Kee Park, Hu-Jang Lee, Mannhohng Jung, Sang-Joon Lee, Gwang Myung Noh, Rangarirai Masanganise, Chulho Oak, Yeh-Chan Ahn

JBO, Vol. 18, Issue 07, 070501, (July 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.7.070501

KEYWORDS: Tumors, Optical coherence tomography, Tumor growth modeling, Eye models, Medicine, Animal model studies, Cancer, Visualization, Biomedical optics, Pathology

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SPIE Journal Paper | 1 October 2011 Open Access

Investigating in vivo airway wall mechanics during tidal breathing with optical coherence tomography

Claire Robertson, Zhongping Chen, Steven George, Sang-Won Lee, Yeh-Chan Ahn, Sari Mahon, Matthew Brenner

JBO, Vol. 16, Issue 10, 106011, (October 2011) https://doi.org/10.1117/12.10.1117/1.3642006

KEYWORDS: Optical coherence tomography, Tissues, In vivo imaging, Mechanics, Natural surfaces, Motion analysis, Image processing, Protactinium, Spatial resolution, Endoscopy

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SPIE Journal Paper | 1 July 2011 Open Access

Multimodality approach to optical early detection and mapping of oral neoplasia

Yeh-Chan Ahn, Jungrae Chung, Petra Wilder-Smith, Zhongping Chen

JBO, Vol. 16, Issue 07, 076007, (July 2011) https://doi.org/10.1117/12.10.1117/1.3595850

KEYWORDS: Optical coherence tomography, Polarimetry, Tissues, Cancer, Blood vessels, Biomedical optics, Diagnostics, Polarization, In vivo imaging, Microscopes

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SPIE Journal Paper | 1 March 2011 Open Access

Calibration and characterization protocol for spectral-domain optical coherence tomography using fiber Bragg gratings

Tae Joong Eom, Yeh-Chan Ahn, Chang-Seok Kim, Zhongping Chen

JBO, Vol. 16, Issue 03, 030501, (March 2011) https://doi.org/10.1117/12.10.1117/1.3552602

KEYWORDS: Fiber Bragg gratings, Spectroscopy, Calibration, Optical coherence tomography, Charge-coupled devices, Spectral resolution, Diffraction gratings, Reflectivity, Diffraction, Point spread functions

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Proceedings Article | 23 February 2010 Paper

Calibration protocol for Fourier-domain OCT using optical fiber gratings

Tae Joong Eom, Bong-Ahn Yu, Woojin Shin, Yeung Lak Lee, Chang-Seok Kim, Yeh-Chan Ahn, Zhongping Chen

Proceedings Volume 7555, 75551M (2010) https://doi.org/10.1117/12.842905

KEYWORDS: Spectroscopy, Fiber Bragg gratings, Optical coherence tomography, Calibration, Charge-coupled devices, Diffraction gratings, Spectral resolution, Optical fibers, Reflectivity, Diffraction

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Proceedings Article | 20 February 2010 Paper

Overcoming barriers in topical administration of gold nanoparticles for optical coherence tomography using multimodal delivery

Chang Soo Kim, Petra Wilder-Smith, Yeh-Chan Ahn, Lih-Huei Liaw, Zhongping Chen, Young Jik Kwon

Proceedings Volume 7554, 755421 (2010) https://doi.org/10.1117/12.842835

KEYWORDS: Gold, Optical coherence tomography, Tissues, Cancer, Ultrasonography, Nanoparticles, Polymers, Tissue optics, Diagnostics, Image resolution

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SPIE Journal Paper | 1 January 2010 Open Access

Detection of vesicant-induced upper airway mucosa damage in the hamster cheek pouch model using optical coherence tomography

Marie Hammer-Wilson, Vi Nguyen, Woonggyu Jung, Yeh-Chan Ahn, Zhongping Chen, Petra Wilder-Smith

JBO, Vol. 15, Issue 01, 016017, (January 2010) https://doi.org/10.1117/12.10.1117/1.3309455

KEYWORDS: Optical coherence tomography, Tissues, Blistering agents, Tissue optics, Lung, Visualization, Scanning electron microscopy, Chemical weapons, Injuries, Eye

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SPIE Journal Paper | 1 November 2009 Open Access

Feasibility of Doppler variance imaging for red blood cell aggregation characterization

Xiangqun Xu, Yeh-Chan Ahn, Zhongping Chen

JBO, Vol. 14, Issue 06, 060507, (November 2009) https://doi.org/10.1117/12.10.1117/1.3275464

KEYWORDS: Blood, Doppler tomography, Optical coherence tomography, Particles, Scattering, Doppler effect, Glasses, In vivo imaging, Blood circulation, Pathology

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SPIE Journal Paper | 1 July 2009 Open Access

Errata: Multimodality bronchoscopic imaging of tracheopathica osteochondroplastica

Henri Colt, Septimiu Murgu, Yeh-Chan Ahn, Matthew Brenner

JBO, Vol. 14, Issue 04, 049801, (July 2009) https://doi.org/10.1117/12.10.1117/1.3223334

KEYWORDS: Medicine, Health sciences, Roads, Head

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SPIE Journal Paper | 1 July 2009 Open Access

Optical approach to the salivary pellicle

Jae Ho Baek, Tatiana Krasieva, Shuo Tang, Yeh-Chan Ahn, Chang Soo Kim, Diana Vu, Zhongping Chen, Petra Wilder-Smith

JBO, Vol. 14, Issue 04, 044001, (July 2009) https://doi.org/10.1117/12.10.1117/1.3158994

KEYWORDS: Pellicles, Teeth, Optical coherence tomography, Tissues, In vivo imaging, 3D image processing, Natural surfaces, Tissue optics, 3D image reconstruction, Biomedical optics

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SPIE Journal Paper | 1 May 2009 Open Access

Enhanced detection of early-stage oral cancer in vivo by optical coherence tomography using multimodal delivery of gold nanoparticles

Chang Soo Kim, Petra Wilder-Smith, Yeh-Chan Ahn, Lih-Huei Liaw, Zhongping Chen, Young Jik Kwon

JBO, Vol. 14, Issue 03, 034008, (May 2009) https://doi.org/10.1117/12.10.1117/1.3130323

KEYWORDS: Gold, Optical coherence tomography, Neptunium, In vivo imaging, Tissues, Cancer, Nanoparticles, Manganese, Signal detection, Scattering

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SPIE Journal Paper | 1 May 2009 Open Access

Multimodality bonchoscopic imaging of tracheopathica osteochondroplastica

Henri Colt, Septimiu Murgu, Yeh-Chan Ahn, Matthew Brenner

JBO, Vol. 14, Issue 03, 034035, (May 2009) https://doi.org/10.1117/12.10.1117/1.3155524

KEYWORDS: Imaging systems, Optical coherence tomography, Bronchoscopy, Ultrasonography, Image resolution, Tissues, Biopsy, Diagnostics, Bone, Cartilage

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SPIE Journal Paper | 1 May 2009 Open Access

Design and implementation of fiber-based multiphoton endoscopy with microelectromechanical systems scanning

Shuo Tang, Woonggyu Jung, Daniel McCormick, Tuqiang Xie, Jianping Su, Yeh-Chan Ahn, Bruce Tromberg, Zhongping Chen

JBO, Vol. 14, Issue 03, 034005, (May 2009) https://doi.org/10.1117/12.10.1117/1.3127203

KEYWORDS: Microelectromechanical systems, Mirrors, Endoscopy, GRIN lenses, Scanners, Single mode fibers, Endoscopes, Femtosecond phenomena, Dispersion, Signal attenuation

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Proceedings Article | 24 February 2009 Paper

Axial resolution and depth range of high-resolution spectral domain optical coherence tomography at 1.3 µm

Sang-Won Lee, Hyun-Woo Jeong, Yeh-Chan Ahn, Woonggyu Jung, Zhongping Chen, Beop-Min Kim

Proceedings Volume 7168, 71682L (2009) https://doi.org/10.1117/12.809939

KEYWORDS: Optical coherence tomography, Image resolution, Spectroscopy, Cameras, Light sources, Point spread functions, Line scan image sensors, Spectral resolution, Data acquisition, Imaging systems

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Proceedings Article | 1 March 2008 Paper

Analysis of surface-tension-driven blood flow using spectral domain optical coherence tomography

Yeh-Chan Ahn, Salvatore Cito, Ioanis Katakis, Jordi Pallares, Zhongping Chen

Proceedings Volume 6886, 68860S (2008) https://doi.org/10.1117/12.764709

KEYWORDS: Blood, Blood circulation, Optical coherence tomography, Doppler tomography, Laser beam diagnostics, Visualization, Curium, Video, Velocity measurements, Lab on a chip

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Proceedings Article | 28 February 2008 Paper

Thermoelastic optical Doppler tomography of biological tissues

Qiang Wang, Yeh-Chan Ahn, Changsoo Kim, Lingfeng Yu, Wangcun Jia, Bin Rao, Zhongping Chen, HuiHua Chiang

Proceedings Volume 6847, 68471B (2008) https://doi.org/10.1117/12.766962

KEYWORDS: Optical coherence tomography, Tissue optics, Tissues, Thermography, Doppler tomography, Nd:YAG lasers, Biomedical optics, Wave propagation, Q switched lasers, Optical tomography

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Proceedings Article | 28 February 2008 Paper

In vitro 3D articular cartilage imaging using endoscopic spectral domain optical coherence tomography (SD-OCT) with a GRIN (gradient index) lens rod based probe

Tuqiang Xie, Yehchan Ahn, Zhongping Chen, George Peavy

Proceedings Volume 6847, 684730 (2008) https://doi.org/10.1117/12.766945

KEYWORDS: Optical coherence tomography, 3D image processing, GRIN lenses, Cartilage, Imaging systems, Tissues, Stereoscopy, 3D image reconstruction, Endoscopy, Natural surfaces

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Proceedings Article | 21 February 2008 Open Access

Miniaturized probe using 2 axis MEMS scanner for endoscopic multiphoton excitation microscopy

Woonggyu Jung, Shuo Tang, Tiquiang Xie, Daniel McCormick, Yeh-Chan Ahn, Jianping Su, Ivan Tomov, Tatiana Krasieva, Bruce Tromberg, Zhongping Chen

Proceedings Volume 6851, 68510D (2008) https://doi.org/10.1117/12.764356

KEYWORDS: Microelectromechanical systems, Mirrors, GRIN lenses, Image visualization, Endoscopy, Multiphoton microscopy, Microscopy, Luminescence, Packaging, Photography

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Proceedings Article | 18 February 2008 Paper

Optical coherence tomography in material deformation by using short pulse laser irradiation

Eun Seo Choi, Wooseop Kwak, Yongjin Shin, Youngseop Kim, Woonggyu Jung, Yeh-Chan Ahn, Zhongping Chen, Eun Joo Jeong, Chang-Seok Kim

Proceedings Volume 6847, 68470W (2008) https://doi.org/10.1117/12.767031

KEYWORDS: Optical coherence tomography, Laser processing, Pulsed laser operation, Scanning electron microscopy, Materials processing, Bone, Visualization, Biomedical optics, Image processing, Laser irradiation

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Proceedings Article | 22 January 2007 Paper

Visualization of turbid two-fluid flows inside microfluidic conduits

Yeh-Chan Ahn, Woonggyu Jung, Dong Sung Kim, Seung-Jae Lee, Dong-Woo Cho, Tae Gon Kang, Tai Hun Kwon, Zhongping Chen

Proceedings Volume 6465, 64650V (2007) https://doi.org/10.1117/12.703505

KEYWORDS: Liquids, Optical coherence tomography, Visualization, Microfluidics, Refraction, Velocity measurements, Backscatter, Capillaries, Nose, Calcium

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Frequency domain optical coherence tomography (OCT) with phase-resolved algorithm is presented to perform highresolution (8 &mgr;m), cross-sectional imaging of structure and velocity in turbid gas-liquid slug flow inside a microtube and turbid liquid-liquid flow inside chaotic mixromixers: a barrier embedded Kenics micromixer and a Kenics micromixer. Slug flow, the most common flow regime in microfluidic gas-liquid two-phase flow, consists of trails of bubbles separated by liquid slugs flowing concurrently and provides significant radial heat and mass transfer. Since interfacial transports are proportional to the interfacial area between two phases, interfacial area concentration defined by interfacial area per unit mixture volume is an important parameter in a biochip with turbid biofluids. All the en face image techniques, such as light microscopy, experience errors in the interfacial area concentration measurement due to light refraction. In addition, they have overlapping depth information from the layers within a laser sheet or a depth of focus of the objective lens. OCT, however, can provide accurate interfacial area concentration in a microtube because it is a cross-sectional imaging technique which dispenses with the refraction correction in the radial direction. Simultaneously, OCT can measure bubble velocity and velocity field inside liquid slugs. The radial liquid velocity was quantified without refraction correction. Two toroidal vortices per liquid slug were visualized which is the essential mechanism for radial heat and mass transfers. The barrier embedded Kenics micromixer and Kenics micromixer are high performance chaotic micromixers with complex three-dimensional geometry. Conventional techniques cannot visualize a cross-sectional mixing pattern in such a complex micromixer. OCT, however, can image the pattern and, thereby, show mixing mechanisms. The barrier embedded Kenics micromixer was proven to have a higher performance by comparison mixing patterns of two micromixers.

Proceedings Article | 22 January 2007 Paper

High-speed three-dimensional endoscopic OCT using MEMS technology

Zhongping Chen, Woonggyu Jung, Yeh-Chan Ahn, Ali Sepehr, William Armstrong, Matt Brenner, Daniel McCormick, Norman Tien

Proceedings Volume 6466, 64660H (2007) https://doi.org/10.1117/12.713950

KEYWORDS: Optical coherence tomography, Microelectromechanical systems, Mirrors, Endoscopy, Visualization, 3D image processing, Tissues, Endoscopes, GRIN lenses, In vivo imaging

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Proceedings Article | 20 February 2006 Paper

Three-dimensional time and Fourier domain endoscopic OCT using 2-axis scanning MEMS mirror

Woonggyu Jung, Daniel McCormick, Yeh-Chan Ahn, Jun Zhang, Norman Tien, Zhongping Chen

Proceedings Volume 6079, 60791I (2006) https://doi.org/10.1117/12.649178

KEYWORDS: Optical coherence tomography, Microelectromechanical systems, Mirrors, Endoscopy, 3D image processing, Tissues, 3D scanning, Visualization, GRIN lenses, Optical scanning systems

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Proceedings Article | 20 February 2006 Paper

Investigation of laminar dispersion with optical coherence tomography and optical Doppler tomography

Yeh-Chan Ahn, Woonggyu Jung, Jun Zhang, Zhongping Chen

Proceedings Volume 6079, 607921 (2006) https://doi.org/10.1117/12.649168

KEYWORDS: Optical coherence tomography, Particles, Doppler tomography, Diffusion, Microfluidics, 3D image processing, Visualization, Biomedical optics, Dynamical systems, Microscopy

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Showing 5 of 27 publications

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