Prof. John S. Werner Profile

Prof. John S. Werner

Professor at UC Davis Medical Ctr

SPIE Involvement:

Author

Publications (55)

Proceedings Article | 9 December 2021 Paper

Paper

Progress in measurements and interpretation of light-evoked retinal function using OCT based optoretinography (ORG)

Robert Zawadzki, Pengfei Zhang, Ewelina Pijewska, Denise Valente, Ratheesh Meleppat, Kari Vienola, Sarah Karlen, M. Szkulmowski, John Werner, Edward Pugh, Ravi Jonnal

Proceedings Volume 11924, 119240M (2021) https://doi.org/10.1117/12.2616045

KEYWORDS: Optical coherence tomography, Data acquisition, Retinal scanning, Retina, Ophthalmology, Neurons, Tissue optics, Scattering, Standards development, Physics

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Presentation

A retinal full-field swept-source optical coherence tomography and flood imaging system with hardware adaptive optics

Denise Valente, Kari Vienola, John Werner, Robert Zawadzki, Ravi Jonnal

Proceedings Volume 11630, 116300F (2021) https://doi.org/10.1117/12.2583905

KEYWORDS: Adaptive optics, Imaging systems, Optical coherence tomography, Floods, Cones, Retina, Aberration correction, Wavefront sensors, Signal to noise ratio, Retinal scanning

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Presentation

Evaluation of effects the ocular metrics (eye movements and ocular aberrations) have on image quality of in vivo retinal optical coherence tomography angiography (OCTA)

Kari Vienola, Denise Valente, John Werner, Ravi Jonnal, Robert Zawadzki

Proceedings Volume 11630, 116300O (2021) https://doi.org/10.1117/12.2579182

KEYWORDS: Eye, Angiography, Optical coherence tomography, In vivo imaging, Image quality, Data acquisition, Wavefronts, Wavefront sensors, Visualization, Systems modeling

Read Abstract +

Proceedings Article | 19 February 2020 Presentation + Paper

Presentation + Paper

Investigating the functional response of human cones and rods with a combined adaptive optics SLO-OCT system

Mehdi Azimipour, Denise Valente, Kari Vienola, John Werner, Robert Zawadzki, Ravi Jonnal

Proceedings Volume 11218, 1121813 (2020) https://doi.org/10.1117/12.2544462

KEYWORDS: Optical coherence tomography, Scanning laser ophthalmoscopy, Cones, Rods, Reflectivity, Adaptive optics, Imaging systems, Adaptive optics optical coherence tomography, Eye, Image segmentation

Read Abstract +

Proceedings Article | 4 March 2019 Presentation

Presentation

Functional retinal imaging using adaptive optics swept-source OCT at 1.6 MHz (Conference Presentation)

Mehdi Azimipour, Justin Migacz, Robert Zawadzki, John Werner, Ravi Jonnal

Proceedings Volume 10867, 108671Y (2019) https://doi.org/10.1117/12.2506900

KEYWORDS: Adaptive optics, Optical coherence tomography, Retinal scanning, Adaptive optics optical coherence tomography, Electrophysiology, Floods, Image segmentation, Mode locking, Image registration, Signal analyzers

Read Abstract +

SPIE Journal Paper | 5 March 2018 Open Access

Open Access

Volumetric imaging of rod and cone photoreceptor structure with a combined adaptive optics-optical coherence tomography-scanning laser ophthalmoscope

Elaine M. Wells-Gray, Stacey Choi, Robert Zawadzki, Susanna Finn, Cherry Greiner, John Werner, Nathan Doble

JBO, Vol. 23, Issue 03, 036003, (March 2018) https://doi.org/10.1117/12.10.1117/1.JBO.23.3.036003

KEYWORDS: Optical coherence tomography, Scanning laser ophthalmoscopy, Cones, Eye, Adaptive optics optical coherence tomography, Rods, Adaptive optics, Motion measurement, Scanners, Image registration

Read Abstract +

SPIE Journal Paper | 31 October 2017 Open Access

Open Access

Challenges and advantages in wide-field optical coherence tomography angiography imaging of the human retinal and choroidal vasculature at 1.7-MHz A-scan rate

Raju Poddar, Justin Migacz, Daniel Schwartz, John Werner, Iwona Gorczynska

JBO, Vol. 22, Issue 10, 106018, (October 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.10.106018

KEYWORDS: Optical coherence tomography, Angiography, Imaging systems, Visualization, Eye, Retina, Image segmentation, Capillaries, Blood circulation, Signal detection

Read Abstract +

Proceedings Article | 8 February 2017 Presentation + Paper

Presentation + Paper

Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system

I. Gorczynska, J. Migacz, R. Jonnal, R. Zawadzki, R. Poddar, J. Werner

Proceedings Volume 10045, 1004510 (2017) https://doi.org/10.1117/12.2251704

KEYWORDS: Optical coherence tomography, Imaging systems, Angiography, Visualization, Eye, Blood circulation, Data visualization, Signal detection, Data acquisition, Image resolution, Spectrum analysis

Read Abstract +

Proceedings Article | 17 July 2015 Paper

Paper

En face projection imaging of the human choroidal layers with tracking SLO and swept source OCT angiography methods

Iwona Gorczynska, Justin Migacz, Robert Zawadzki, Narendran Sudheendran, Yifan Jian, Pavan Tiruveedhula, Austin Roorda, John Werner

Proceedings Volume 9541, 954112 (2015) https://doi.org/10.1117/12.2183603

KEYWORDS: Optical coherence tomography, Eye, Angiography, Scanning laser ophthalmoscopy, Visualization, Retina, Imaging systems, Speckle, Image visualization, Photovoltaics

Read Abstract +

Proceedings Article | 13 March 2015 Paper

Paper

Performance of a combined optical coherence tomography and scanning laser ophthalmoscope with adaptive optics for human retinal imaging applications

Elaine Wells-Gray, Robert Zawadzki, Susanna Finn, Cherry Greiner, John Werner, Stacey Choi, Nathan Doble

Proceedings Volume 9335, 93350N (2015) https://doi.org/10.1117/12.2079772

KEYWORDS: Optical coherence tomography, Scanning laser ophthalmoscopy, Adaptive optics, Eye, Mirrors, Cones, Imaging systems, Retina, Retinal scanning, Telescopes

Read Abstract +

SPIE Journal Paper | 17 December 2014 Open Access

Open Access

In vivo imaging of human vasculature in the chorioretinal complex using phase-variance contrast method with phase-stabilized 1-μm swept-source optical coherence tomography

Raju Poddar, Dae Yu Kim, John Werner, Robert Zawadzki

JBO, Vol. 19, Issue 12, 126010, (December 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.12.126010

KEYWORDS: Optical coherence tomography, Angiography, In vivo imaging, Image segmentation, Imaging systems, Visualization, Retina, Data acquisition, Head, Phase measurement

Read Abstract +

Proceedings Article | 28 February 2014 Paper

Paper

Improved in vivo imaging of human blood circulation in the chorioretinal complex using phase variance method with new phase stabilized 1 μm swept-source optical coherence tomography (pv-SSOCT)

Raju Poddar, Dae Yu Kim, John Werner, Robert Zawadzki

Proceedings Volume 8930, 89300X (2014) https://doi.org/10.1117/12.2040186

KEYWORDS: Optical coherence tomography, Imaging systems, Data acquisition, Image segmentation, Visualization, Fiber Bragg gratings, In vivo imaging, Blood circulation, Angiography, Retina

Read Abstract +

SPIE Journal Paper | 30 August 2013 Open Access

Open Access

Publisher’s Note: Three-dimensional anterior segment imaging in patients with type 1 Boston Keratoprosthesis with switchable full depth range swept source optical coherence tomography

Raju Poddar, Dennis Cortes, John Werner, Mark Mannis, Robert Zawadzki

JBO, Vol. 18, Issue 08, 089802, (August 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.8.089802

KEYWORDS: 3D image processing, Image segmentation, Optical coherence tomography, Biomedical optics, Retinal scanning, Ophthalmology

Read Abstract +

SPIE Journal Paper | 2 August 2013 Open Access

Open Access

Three-dimensional anterior segment imaging in patients with type 1 Boston Keratoprosthesis with switchable full depth range swept source optical coherence tomography

Poddar Raju, Dennis Cortes, John Werner, Mark Mannis, Robert Zawadzki

JBO, Vol. 18, Issue 08, 086002, (August 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.8.086002

KEYWORDS: Image segmentation, Imaging systems, Optical coherence tomography, 3D image processing, Cornea, Image resolution, Range imaging, Eye, Data acquisition, Visualization

Read Abstract +

Proceedings Article | 26 March 2013 Paper

Paper

Reflective afocal adaptive optics: optical coherence tomography retinal imaging system

Sang Hyuck Lee, John Werner, Robert Zawadzki

Proceedings Volume 8567, 856722 (2013) https://doi.org/10.1117/12.2003421

KEYWORDS: Adaptive optics, Adaptive optics optical coherence tomography, Optical coherence tomography, Imaging systems, Wavefronts, Mirrors, Eye, Reflectivity, Biomedical optics, Retinal scanning

Read Abstract +

Proceedings Article | 26 March 2013 Paper

Paper

Visualization of human retinal and choroidal vascular networks with phase-variance optical coherence tomography

Dae Yu Kim, Jeff Fingler, Robert Zawadzki, Malvika Verma, Daniel Schwartz, John Werner, Scott Fraser

Proceedings Volume 8567, 856702 (2013) https://doi.org/10.1117/12.2004606

KEYWORDS: Optical coherence tomography, Image segmentation, Image processing, Visualization, Retina, Angiography, Eye, Optical networks, Data acquisition, Indocyanine green

Read Abstract +

Proceedings Article | 20 March 2013 Paper

Paper

Application of full range swept source optical coherence tomography for imaging of the anterior eye segment in patients with type I Boston Keratoprosthesis

Raju Poddar, Dennis Cortes, Robert Zawadzki, Mark Mannis, John Werner

Proceedings Volume 8571, 85713C (2013) https://doi.org/10.1117/12.2006961

KEYWORDS: Image segmentation, Optical coherence tomography, Imaging systems, Eye, Cornea, Image resolution, 3D image processing, Visualization, Tissues, In vivo imaging

Read Abstract +

SPIE Journal Paper | 3 December 2012 Open Access

Open Access

Complex conjugate artifact-free adaptive optics optical coherence tomography of in vivo human optic nerve head

Dae Yu Kim, John Werner, Robert Zawadzki

JBO, Vol. 17, Issue 12, 126005, (December 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.12.126005

KEYWORDS: Adaptive optics optical coherence tomography, In vivo imaging, Mirrors, Optical coherence tomography, Optic nerve, Head, Eye, Image resolution, Reconstruction algorithms, Imaging systems

Read Abstract +

Proceedings Article | 9 March 2012 Paper

Paper

In-vivo imaging of inner retinal cellular morphology with adaptive optics - optical coherence tomography: challenges and possible solutions

Robert Zawadzki, Steven Jones, Dae Yu Kim, Lisa Poyneer, Arlie Capps, Bernd Hamann, Scot Olivier, John Werner

Proceedings Volume 8209, 82091G (2012) https://doi.org/10.1117/12.907678

KEYWORDS: Adaptive optics optical coherence tomography, Optical coherence tomography, Data acquisition, Adaptive optics, Retina, Speckle, Visualization, Imaging systems, Retinal scanning, Scanning laser ophthalmoscopy

Read Abstract +

Proceedings Article | 1 February 2012 Paper

Paper

Visualization of human retinal capillary networks: a comparison of intensity, speckle-variance and phase-variance optical coherence tomography

Dae Yu Kim, Jeff Fingler, John Werner, Daniel Schwartz, Scott Fraser, Robert Zawadzki

Proceedings Volume 8213, 821307 (2012) https://doi.org/10.1117/12.906940

KEYWORDS: Optical coherence tomography, Retina, Image segmentation, Visualization, Capillaries, Image processing, Doppler tomography, Data acquisition, In vivo imaging, Data processing

Read Abstract +

Proceedings Article | 3 November 2011 Paper

Paper

Application of a new high-speed magnetic deformable mirror for in-vivo retinal imaging

Sandra Balderas-Mata, Steven Jones, Robert Zawadzki, John Werner

Proceedings Volume 8011, 801195 (2011) https://doi.org/10.1117/12.903365

KEYWORDS: Adaptive optics, Eye, In vivo imaging, Retina, Cameras, Actuators, Imaging systems, Floods, Deformable mirrors, Mirrors

Read Abstract +

Nowadays in ophthalmologic practice several commercial instruments are available to image patient retinas in vivo. Many modern fundus cameras and confocal scanning laser ophthalmoscopes allow acquisition of two dimensional en face images of the retina with both back reflected as well as fluorescent light. Additionally, optical coherence tomography systems allow non-invasive probing of three-dimensional retinal morphology. For all of these instruments the available lateral resolution is limited by optical quality of the human eye used as the imaging objective. To improve lateral resolution and achieve diffraction-limited imaging, adaptive optics (AO) can be implemented with any of these imaging systems to correct both static and dynamic aberrations inherent in human eyes. Most of the wavefront correctors used previously in AO systems have limited dynamic range and an insufficient number of actuators to achieve diffraction-limited correction of most human eyes. Thus, additional corrections were necessary, either by trial lenses or additional deformable mirrors (DMs). The UC Davis AO flood-illuminated fundus camera system described in this paper has been previously used to acquire in vivo images of the photoreceptor mosaic and for psychophysical studies on normal and diseased retinas. These results were acquired using a DM manufactured by Litton ITEK (DM109), which has 109 actuators arranged in a hexagonal array below a continuous front-surface mirror. It has an approximate surface actuator stroke of ±2μm. Here we present results with a new hi-speed magnetic DM manufactured by ALPAO (DM97, voice coil technology), which has 97 actuators and similar inter-actuator stroke (>3μm, mirror surface) but much higher low-order aberration correction (defocus stroke of at least ±30μm) than the previous one. In this paper we report results of testing performance of the ALPAO DM for the correction of human eye aberrations. Additionally changes made to our AO flood illuminated system are presented along with images of the model eye retina and in-vivo human retina acquired with this system.

Proceedings Article | 10 March 2011 Paper

Paper

AO-OCT with reference arm phase shifting for complex conjugate artifact-free imaging of in vivo retinal structures

Robert Zawadzki, Dae Yu Kim, Steven Jones, Suman Pilli, Scot Olivier, John Werner

Proceedings Volume 7885, 78850B (2011) https://doi.org/10.1117/12.873955

KEYWORDS: Adaptive optics optical coherence tomography, In vivo imaging, Mirrors, Phase shifting, Optical coherence tomography, Phase shifts, Adaptive optics, Imaging systems, Reconstruction algorithms, Optical filters

Read Abstract +

Proceedings Article | 16 February 2011 Paper

Paper

Visualization of human retinal micro-capillaries with phase contrast high-speed optical coherence tomography

Dae Yu Kim, Jeff Fingler, John Werner, Daniel Schwartz, Scott Fraser, Robert Zawadzki

Proceedings Volume 7889, 78890H (2011) https://doi.org/10.1117/12.873896

KEYWORDS: Optical coherence tomography, Visualization, Retina, In vivo imaging, Data acquisition, Phase contrast, Angiography, Imaging systems, Data processing, CMOS sensors

Read Abstract +

Proceedings Article | 12 February 2011 Paper

Paper

Correction of eye-motion artifacts in AO-OCT data sets

Arlie Capps, Robert Zawadzki, Qiang Yang, David Arathorn, Curtis Vogel, Bernd Hamann, John Werner

Proceedings Volume 7885, 78850D (2011) https://doi.org/10.1117/12.874376

KEYWORDS: Optical coherence tomography, Scanning laser ophthalmoscopy, Eye, Adaptive optics optical coherence tomography, Data acquisition, Motion estimation, Adaptive optics, Retina, Mirrors, Image analysis

Read Abstract +

SPIE Journal Paper | 1 September 2010 Open Access

Open Access

Comparison of phase-shifting techniques for in vivo full-range, high-speed Fourier-domain optical coherence tomography

Dae Yu Kim, John Werner, Robert Zawadzki

JBO, Vol. 15, Issue 05, 056011, (September 2010) https://doi.org/10.1117/12.10.1117/1.3494556

KEYWORDS: Phase shifts, Ferroelectric materials, In vivo imaging, Optical coherence tomography, Mirrors, Phase shifting, Sensors, Phase modulation, Spectroscopy, Signal detection

Read Abstract +

Proceedings Article | 3 March 2010 Paper

Paper

Retinal imaging with a combined adaptive optics/optical coherence tomography and adaptive optics/scanning laser ophthalmoscopy system

Robert Zawadzki, Steven Jones, Suman Pilli, Dae Yu Kim, Scot Olivier, John Werner

Proceedings Volume 7550, 75500Z (2010) https://doi.org/10.1117/12.842946

KEYWORDS: Scanning laser ophthalmoscopy, Optical coherence tomography, Adaptive optics, Adaptive optics optical coherence tomography, Imaging systems, Retinal scanning, Deformable mirrors, Mirrors, Data acquisition, Eye

Read Abstract +

Proceedings Article | 3 March 2010 Paper

Paper

Toward building an anatomically correct solid eye model with volumetric representation of retinal morphology

Robert Zawadzki, T. Scott Rowe, Alfred Fuller, Bernd Hamann, John Werner

Proceedings Volume 7550, 75502F (2010) https://doi.org/10.1117/12.842888

KEYWORDS: Eye models, Optical coherence tomography, Retina, Eye, Solids, 3D modeling, Water, Data modeling, Laser systems engineering, Polymethylmethacrylate

Read Abstract +

Proceedings Article | 20 February 2010 Paper

Paper

Evaluation of complex conjugate artifact removal methods used in spectrometer-based Fourier-domain optical coherence tomography systems: a comparative study

Dae Yu Kim, John Werner, Robert Zawadzki

Proceedings Volume 7554, 75542X (2010) https://doi.org/10.1117/12.842930

KEYWORDS: Phase shifts, Optical coherence tomography, Ferroelectric materials, Mirrors, Scanners, Spectroscopy, Sensors, Phase modulation, In vivo imaging, Image quality standards

Read Abstract +

Proceedings Article | 24 February 2009 Paper

Paper

Performance of a MEMS-based AO-OCT system using Fourier reconstruction

Julia Evans, Robert Zawadzki, Steve Jones, Scot Olivier, John Werner

Proceedings Volume 7209, 720905 (2009) https://doi.org/10.1117/12.808002

KEYWORDS: Wavefronts, Adaptive optics, Microelectromechanical systems, Error analysis, Actuators, Control systems, Photons, Deformable mirrors, Eye, Adaptive optics optical coherence tomography

Read Abstract +

Proceedings Article | 20 February 2009 Paper

Paper

Optical coherence tomography and Raman spectroscopy of the retina

Julia Evans, Robert Zawadzki, Rui Liu, James Chan, Stephen Lane, John Werner

Proceedings Volume 7171, 71710O (2009) https://doi.org/10.1117/12.807885

KEYWORDS: Raman spectroscopy, Optical coherence tomography, Retina, In vivo imaging, Raman scattering, Signal to noise ratio, Confocal microscopy, Molecular spectroscopy, Spectroscopy, Polymers

Read Abstract +

Proceedings Article | 18 February 2009 Paper

Paper

Comparison of real-time visualization of volumetric OCT data sets by CPU-slicing and GPU-ray casting methods

Alfred Fuller, Robert Zawadzki, Bernd Hamann, John Werner

Proceedings Volume 7163, 716312 (2009) https://doi.org/10.1117/12.809544

KEYWORDS: Visualization, Optical coherence tomography, Light sources and illumination, Volume visualization, Opacity, Visibility, Eye, Volume rendering, Picosecond phenomena, Light sources

Read Abstract +

Proceedings Article | 18 February 2009 Paper

Paper

Combined adaptive optics: optical coherence tomography and adaptive optics: scanning laser ophthalmoscopy system for retinal imaging

Robert Zawadzki, Steven Jones, Diana Chen, Stacey Choi, Julia Evans, Scot Olivier, John Werner

Proceedings Volume 7163, 71630F (2009) https://doi.org/10.1117/12.809419

KEYWORDS: Optical coherence tomography, Scanning laser ophthalmoscopy, Adaptive optics optical coherence tomography, Adaptive optics, Imaging systems, Scanners, Eye, Retinal scanning, Data acquisition, Retina

Read Abstract +

Proceedings Article | 30 December 2008 Paper

Paper

Challenges and possibilities for developing adaptive optics: ultra-high resolution optical coherence tomography for clinical in vivo retinal imaging

Robert Zawadzki, Stacey Choi, Julia Evans, John Werner

Proceedings Volume 7139, 71390X (2008) https://doi.org/10.1117/12.819169

KEYWORDS: Adaptive optics optical coherence tomography, Adaptive optics, Optical coherence tomography, Eye, Image resolution, Imaging systems, Retinal scanning, Wavefront sensors, Retina, Chromatic aberrations

Read Abstract +

Proceedings Article | 11 March 2008 Paper

Paper

Ultra-high resolution adaptive optics: optical coherence tomography for in vivo imaging of healthy and diseased retinal structures

Robert Zawadzki, Yan Zhang, Steven Jones, Stacey Choi, Barry Cense, Julia Evans, Donald Miller, Scot Olivier, John Werner

Proceedings Volume 6844, 684408 (2008) https://doi.org/10.1117/12.764115

KEYWORDS: Adaptive optics optical coherence tomography, Optical coherence tomography, Adaptive optics, Speckle, Image resolution, Visualization, Eye, Retina, Imaging systems, In vivo imaging

Read Abstract +

Proceedings Article | 25 February 2008 Paper

Paper

Improved representation of retinal data acquired with volumetric Fd-OCT: co-registration, visualization, and reconstruction of a large field of view

Robert Zawadzki, Alfred Fuller, Stacey Choi, David Wiley, Bernd Hamann, John Werner

Proceedings Volume 6844, 68440C (2008) https://doi.org/10.1117/12.764070

KEYWORDS: Optical coherence tomography, Visualization, Data acquisition, Eye, Retina, Imaging systems, Visual analytics, Retinal scanning, 3D acquisition, Head

Read Abstract +

Advances in Fourier-domain optical coherence tomography (Fd-OCT) permit visualization of three-dimensional morphology of in-vivo retinal structures in a way that promises to revolutionize clinical and experimental imaging of the retina. The relevance of these advances will be further increased by the recent introduction of several commercial Fd-OCT instruments that can be used in clinical practice. However, due to some inherent limitations of current Fd-OCT technology (e.g., lack of spectroscopic information, inability to measure fluorescent signals), it is important to co-register Fd-OCT data with images obtained by other clinical imaging modalities such as fundus cameras and fluorescence angiography to create a more complete interpretation and representation of structures imaged. The co-registration between different imaging platforms becomes even more important if small retinal changes are monitored for early detection and treatment. Despite advances in volume acquisition speed with FD-OCT, eye/head motion artifacts can be still seen on acquired data. Additionally high-sampling density, large field-of-view (FOV) Fd-OCT volumes may also be needed for comparison with conventional imaging. In standard Fd-OCT systems, higher sampling density and larger imaging FOV (with constant sampling densities) lead to longer acquisition time which further increases eye/head motion artifacts. To overcome those problems, we tested 3D stitching of multiple, smaller retinal volumes which can be acquired in a less time (reduction of motion artifacts) and/or when stitched create a larger FOV representation of the retina. Custom visualization software that makes possible manual co-registration and simultaneous visualization of volumetric Fd-OCT data sets is described. Volumetric visualizations of healthy retinas with corresponding fundus pictures are presented followed by examples of retinal volumes of high sampling density that are created from multiple "standard" Fd-OCT volumes.

Proceedings Article | 8 February 2008 Paper

Paper

Compact MEMS-based adaptive optics: optical coherence tomography for clinical use

Diana Chen, Scot Olivier, Steven Jones, Robert Zawadzki, Julia Evans, Stacey Choi, John Werner

Proceedings Volume 6888, 68880F (2008) https://doi.org/10.1117/12.772035

KEYWORDS: Adaptive optics, Mirrors, Adaptive optics optical coherence tomography, Monochromatic aberrations, Optical coherence tomography, Scanners, Deformable mirrors, Telescopes, Wavefront sensors, Eye

Read Abstract +

Proceedings Article | 8 February 2008 Paper

Paper

Performance of a MEMS-based AO-OCT system

Julia Evans, Robert Zawadzki, Steve Jones, Samelia Okpodu, Scot Olivier, John Werner

Proceedings Volume 6888, 68880G (2008) https://doi.org/10.1117/12.771673

KEYWORDS: Wavefronts, Adaptive optics, Microelectromechanical systems, Error analysis, Eye, Adaptive optics optical coherence tomography, Eye models, Point spread functions, Deformable mirrors, Control systems

Read Abstract +

SPIE Journal Paper | 1 July 2007 Open Access

Open Access

Adaptation of a support vector machine algorithm for segmentation and visualization of retinal structures in volumetric optical coherence tomography data sets

Robert Zawadzki, Alfred Fuller, David Wiley, Bernd Hamann, Stacey Choi, John Werner

JBO, Vol. 12, Issue 04, 041206, (July 2007) https://doi.org/10.1117/12.10.1117/1.2772658

KEYWORDS: Image segmentation, Visualization, Optical coherence tomography, Data acquisition, Visual analytics, Eye, Retina, Volume visualization, Human-machine interfaces, 3D acquisition

Read Abstract +

Proceedings Article | 26 March 2007 Paper

Paper

Correction of motion artifacts and scanning beam distortions in 3D ophthalmic optical coherence tomography imaging

Robert Zawadzki, Alfred Fuller, Stacey Choi, David Wiley, Bernd Hamann, John Werner

Proceedings Volume 6426, 642607 (2007) https://doi.org/10.1117/12.701524

KEYWORDS: Optical coherence tomography, Eye, Head, Scanners, Visualization, Data acquisition, Retina, 3D image processing, Coherence imaging, 3D metrology

Read Abstract +

Proceedings Article | 5 March 2007 Paper

Paper

Application of adaptive optics: optical coherence tomography for in vivo imaging of microscopic structures in the retina and optic nerve head

Robert Zawadzki, Yan Zhang, Steven Jones, Stacey Choi, Barry Cense, Diana Chen, Alfred Fuller, Donald Miller, Scot Olivier, John Werner

Proceedings Volume 6426, 64261O (2007) https://doi.org/10.1117/12.701512

KEYWORDS: Adaptive optics optical coherence tomography, Optical coherence tomography, Adaptive optics, Visualization, Retina, Eye, Deformable mirrors, In vivo imaging, Head, Wavefronts

Read Abstract +

Proceedings Article | 9 February 2007 Paper

Paper

Adaptive optics ophthalmologic systems using dual deformable mirrors

S. Jones, S. Olivier, D. Chen, S. Joeres, S. Sadda, R. Zawadzki, J. Werner, D. Miller

Proceedings Volume 6467, 64670H (2007) https://doi.org/10.1117/12.711189

KEYWORDS: Adaptive optics, Eye, Deformable mirrors, Mirrors, Imaging systems, Retina, Wavefronts, Microelectromechanical systems, Optical coherence tomography, Actuators

Read Abstract +

Proceedings Article | 9 February 2007 Paper

Paper

Ultrahigh-resolution adaptive optics - optical coherence tomography: toward isotropic 3-um resolution for in vivo retinal imaging

Robert Zawadzki, Yan Zhang, Steven Jones, R. Daniel Ferguson, Stacey Choi, Barry Cense, Julia Evans, Diana Chen, Donald Miller, Scot Olivier, John Werner

Proceedings Volume 6429, 642909 (2007) https://doi.org/10.1117/12.704639

KEYWORDS: Adaptive optics, Adaptive optics optical coherence tomography, Optical coherence tomography, Eye, Light sources, Wavefronts, Image resolution, Chromatic aberrations, Retina, Imaging systems

Read Abstract +

Proceedings Article | 7 March 2006 Paper

Paper

Adaptive optics-optical coherence tomography for in vivo retinal imaging: effects of spectral bandwidth on image quality

Robert Zawadzki, Steven Jones, Mingtao Zhao, Stacey Choi, Sophie Laut, Scot Olivier, Joseph Izatt, John Werner

Proceedings Volume 6138, 61381X (2006) https://doi.org/10.1117/12.647540

KEYWORDS: Optical coherence tomography, Adaptive optics, Adaptive optics optical coherence tomography, Wavefronts, Light sources, Eye, Mirrors, Wavefront sensors, Retinal scanning, Deformable mirrors

Read Abstract +

Proceedings Article | 7 March 2006 Paper

Paper

Motion-free volumetric retinal imaging with adaptive optics spectral-domain optical coherence tomography

Yan Zhang, Jungtae Rha, Abraham Cense, Ravi Jonnal, Weihua Gao, Robert Zawadzki, John Werner, Steve Jones, Scot Olivier, Donald Miller

Proceedings Volume 6138, 613802 (2006) https://doi.org/10.1117/12.649006

KEYWORDS: Adaptive optics, Eye, Retina, Mirrors, Cameras, Optical coherence tomography, Cones, Retinal scanning, Adaptive optics optical coherence tomography, Distortion

Read Abstract +

Proceedings Article | 7 March 2006 Paper

Paper

3D OCT imaging in clinical settings: toward quantitative measurements of retinal structures

Robert Zawadzki, Alfred Fuller, Mingtao Zhao, David Wiley, Stacey Choi, Bradley Bower, Bernd Hamann, Joseph Izatt, John Werner

Proceedings Volume 6138, 613803 (2006) https://doi.org/10.1117/12.647567

KEYWORDS: Image segmentation, Optical coherence tomography, 3D image processing, Eye, 3D acquisition, Visualization, Retina, 3D metrology, Data acquisition, 3D visualizations

Read Abstract +

Proceedings Article | 20 February 2006 Paper

Paper

Adaptive optics/optical coherence tomography for in vivo retinal imaging: comparative analysis of two wavefront correctors

Robert Zawadzki, Steven Jones, Mingtao Zhao, Stacey Choi, Sophie Laut, Scot Olivier, Joseph Izatt, John Werner

Proceedings Volume 6079, 607908 (2006) https://doi.org/10.1117/12.647568

KEYWORDS: Adaptive optics, Wavefronts, Mirrors, Optical coherence tomography, Adaptive optics optical coherence tomography, Deformable mirrors, Eye, Microelectromechanical systems, Wavefront sensors, Retinal scanning

Read Abstract +

Proceedings Article | 12 November 2005 Paper

Paper

Bimorph deformable mirror: an appropriate wavefront corrector for retinal imaging?

Sophie Laut, Steve Jones, Hyunkyu Park, David Horsley, Scot Olivier, John Werner

Proceedings Volume 6007, 60070Q (2005) https://doi.org/10.1117/12.630961

KEYWORDS: Wavefronts, Monochromatic aberrations, Adaptive optics, Actuators, Deformable mirrors, Wavefront sensors, Lenses, Mirrors, Retinal scanning, Control systems

Read Abstract +

Proceedings Article | 11 November 2005 Paper

Paper

Scanning laser ophthalmoscope design with adaptive optics

Sophie Laut, Steven Jones, Scot Olivier, John Werner

Proceedings Volume 6007, 60070I (2005) https://doi.org/10.1117/12.630975

KEYWORDS: Eye, Retina, Adaptive optics, Scanning laser ophthalmoscopy, Wavefronts, Light emitting diodes, Imaging systems, Actuators, Wavefront sensors, Mirrors

Read Abstract +

Proceedings Article | 7 October 2005 Paper

Paper

Adaptive-optics optical coherence tomography for high-resolution and high-speed in vivo retinal imaging

Robert Zawadzki, Stacey Choi, Sophie Laut, John Werner, Steven Jones, Scot Olivier, Mingtao Zhao, Bradley Bower, Joseph Izatt

Proceedings Volume 5861, 586104 (2005) https://doi.org/10.1117/12.632962

KEYWORDS: Optical coherence tomography, Adaptive optics, Eye, Adaptive optics optical coherence tomography, Imaging systems, In vivo imaging, Retinal scanning, Image resolution, Deformable mirrors, Retina

Read Abstract +

Proceedings Article | 18 April 2005 Paper

Paper

Exposure time dependence of image quality in high-speed retinal in vivo Fourier-domain OCT

Robert Zawadzki, Bradley Bower, Mingtao Zhao, Marinko Sarunic, Sophie Laut, John Werner, Joseph Izatt

Proceedings Volume 5688, (2005) https://doi.org/10.1117/12.591660

KEYWORDS: Optical coherence tomography, Image quality, In vivo imaging, Signal to noise ratio, Mirrors, Spectroscopy, Charge-coupled devices, Retina, Eye, Imaging systems

Read Abstract +

Proceedings Article | 18 April 2005 Paper

Paper

Characterization for vision science applications of a bimorph deformable mirror using phase-shifting interferometry

David Horsley, Hyunkyu Park, Sophie Laut, John Werner

Proceedings Volume 5688, (2005) https://doi.org/10.1117/12.591848

KEYWORDS: Mirrors, Electrodes, Actuators, Monochromatic aberrations, Deformable mirrors, Adaptive optics, Wavefronts, Interferometers, Spatial frequencies, Microelectromechanical systems

Read Abstract +

Proceedings Article | 24 December 2003 Paper

Paper

Characterization and operation of a liquid crystal adaptive optics phoropter

Abdul Ahad Awwal, Brian Bauman, Donald Gavel, Scot Olivier, Steve Jones, Dennis Silva, Joseph Hardy, Thomas Barnes, John Werner

Proceedings Volume 5169, (2003) https://doi.org/10.1117/12.510393

KEYWORDS: Wavefronts, Spatial light modulators, Adaptive optics, Eye, Liquid crystals, Sensors, Wavefront sensors, Visualization, Retina, Monochromatic aberrations

Read Abstract +

Proceedings Article | 6 June 2002 Paper

Paper

What is color?

Paul Green-Armytage, Clyde Hardin, Lois Swirnoff, John Werner, Osvaldo da Pos, Rolf Kuehni

Proceedings Volume 4421, (2002) https://doi.org/10.1117/12.464713

Read Abstract +

Proceedings Article | 6 June 2002 Paper

Paper

Color vision is form and object vision

John Werner, Michael Webster

Proceedings Volume 4421, (2002) https://doi.org/10.1117/12.464653

Read Abstract +

Proceedings Article | 4 February 2002 Paper

Paper

High-resolution adaptive optics test bed for vision science

Scott Wilks, Charles Thompson, Scot Olivier, Brian Bauman, Laurence Flath, Dennis Silva, Robert Sawvel, Thomas Barnes, John Werner

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454810

KEYWORDS: Spatial light modulators, Adaptive optics, Eye, Wavefronts, LCDs, Visualization, Photovoltaics, Optical testing, Retina, Liquid crystals

Read Abstract +

Showing 5 of 55 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement