Dr. Robert Amelard Profile

Dr. Robert Amelard

Postdoctoral Fellow at Schlegel-UW Research Institute for Aging

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Publications (17)

SPIE Journal Paper | 17 November 2022 Open Access

Assessing jugular venous compliance with optical hemodynamic imaging by modulating intrathoracic pressure

Robert Amelard, Nyan Flannigan, Courtney Patterson, Hannah Heigold, Richard Hughson, Andrew Robertson

JBO, Vol. 27, Issue 11, 116005, (November 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.11.116005

KEYWORDS: Veins, Optical imaging, Hemodynamics, Heart, Signal attenuation, Ultrasonography, Blood, Compliance, Biomedical optics, Optical sensing

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Proceedings Article | 9 December 2021 Paper

Monte Carlo photon migration modeling for assessing external jugular venous dynamics

Hannah Heigold, Andrew Robertson, Courtney Patterson, Richard Hughson, Robert Amelard

Proceedings Volume 11920, 119201G (2021) https://doi.org/10.1117/12.2615376

KEYWORDS: Tissue optics, Monte Carlo methods, Tissues, Reflectivity, Natural surfaces, Veins, Photon transport, Absorption, Particle filters, Optical properties

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SPIE Journal Paper | 13 August 2021 Open Access

Multi-modal diffuse optical spectroscopy for high-speed monitoring and wide-area mapping of tissue optical properties and hemodynamics

Jesse Lam, Brian Hill, Timothy Quang, Robert Amelard, Sehwan Kim, Hossein Yazdi, Robert Warren, Kyle Cutler, Bruce Tromberg

JBO, Vol. 26, Issue 08, 085002, (August 2021) https://doi.org/10.1117/12.10.1117/1.JBO.26.8.085002

KEYWORDS: Tissues, Hemodynamics, Tissue optics, Data acquisition, Diffuse optical spectroscopy, Oxygen, Optical properties, Imaging systems, Semiconductor lasers, In vivo imaging

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Significance: Diffuse optical spectroscopic imaging (DOSI) is a versatile technology sensitive to changes in tissue composition and hemodynamics and has been used for a wide variety of clinical applications. Specific applications have prompted the development of versions of the DOSI technology to fit specific clinical needs. This work describes the development and characterization of a multi-modal DOSI (MM-DOSI) system that can acquire metabolic, compositional, and pulsatile information at multiple penetration depths in a single hardware platform. Additionally, a 3D tracking system is integrated with MM-DOSI, which enables registration of the acquired data to the physical imaging area. Aim: We demonstrate imaging, layered compositional analysis, and metabolism tracking capabilities using a single MM-DOSI system on optical phantoms as well as in vivo human tissue. Approach: We characterize system performance with a silicone phantom containing an embedded object. To demonstrate multi-layer sensitivity, we imaged human calf tissue with a 4.8-mm skin-adipose thickness. Human thenar tissue was also measured using a combined broadband DOSI and continuous-wave near-infrared spectroscopy method (∼15 Hz acquisition rate). Results: High-resolution optical property maps of absorption (μa) and reduced scattering (μs ′ ) were recovered on the phantom by capturing over 1000 measurement points in under 5 minutes. On human calf tissue, we show two probing depth layers have significantly different (p < 0.001) total-hemo/myoglobin and μs ′ composition. On thenar tissue, we calculate tissue arterial oxygen saturation, venous oxygen saturation, and tissue metabolic rate of oxygen consumption during baseline and after release of an arterial occlusion. Conclusions: The MM-DOSI can switch between collection of broadband spectra, high-resolution images, or multi-depth hemodynamics without any hardware reconfiguration. We conclude that MM-DOSI enables acquisition of high resolution, multi-modal data consolidated in a single platform, which can provide a more comprehensive understanding of tissue hemodynamics and composition for a wide range of clinical applications.

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Proceedings Article | 5 March 2021 Presentation

Frequency-domain diffuse optical spectroscopy with real-time data visualization for monitoring of breast neoplasms

Matthew Applegate, Robert Amelard, Carlos Gómez, Darren Roblyer

Proceedings Volume 11639, 1163907 (2021) https://doi.org/10.1117/12.2578366

KEYWORDS: Diffuse optical spectroscopy, Data visualization, Breast, Visualization, Video, Tumors, Tissue optics, Optical tracking, Optical simulations, Optical properties

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Proceedings Article | 13 March 2019 Presentation

Non-contact biophotonic assessment of changes in central venous pressure using photoplethysmographic imaging (Conference Presentation)

Robert Amelard, Jason Au, Kevin Murray, Danielle Greaves, Richard Hughson

Proceedings Volume 10885, 1088506 (2019) https://doi.org/10.1117/12.2510763

KEYWORDS: Biomedical optics, Photoplethysmography, Imaging systems, Veins, Head, Heart, Blood, Neck, Hemodynamics, Image filtering

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Proceedings Article | 20 February 2018 Paper

Non-contact assessment of obstructive sleep apnea cardiovascular biomarkers using photoplethysmography imaging

Robert Amelard, Kaylen Pfisterer, Shubh Jagani, David Clausi, Alexander Wong

Proceedings Volume 10501, 1050113 (2018) https://doi.org/10.1117/12.2290672

KEYWORDS: Photoplethysmography, Absorbance, Imaging systems, Arteries, Hemodynamics, Blood, Blood circulation, Sensors

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Proceedings Article | 20 February 2018 Paper

Differential color space analysis for investigating nutrient content in a pureed food dilution-flavor matrix: a step toward objective malnutrition risk assessment

Kaylen Pfisterer, Robert Amelard, Alexander Wong

Proceedings Volume 10501, 105010J (2018) https://doi.org/10.1117/12.2289028

KEYWORDS: Food inspection, Absorption, RGB color model, Reflectivity, Chromophores, Absorbance, Imaging systems

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Proceedings Article | 17 February 2017 Presentation + Paper

Assessing photoplethysmographic imaging performance beyond facial perfusion analysis

Robert Amelard, Richard Hughson, Danielle Greaves, David Clausi, Alexander Wong

Proceedings Volume 10072, 100720Q (2017) https://doi.org/10.1117/12.2252114

KEYWORDS: Photoplethysmography, Imaging systems, Arteries, Diffuse reflectance spectroscopy, Bandpass filters, Sensing systems, Tissue optics, Blood, Biomedical optics, Heart, Hemodynamics, Ultrasonography, Neck, Analytical research

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Proceedings Article | 8 February 2017 Presentation + Paper

Non-contact arrhythmia assessment in natural settings: a step toward preventive cardiac care

Robert Amelard, Richard Hughson, David Clausi, Alexander Wong

Proceedings Volume 10042, 1004205 (2017) https://doi.org/10.1117/12.2252133

KEYWORDS: Photoplethysmography, Blood, Imaging systems, Cardiovascular system, Hemodynamics, Signal detection, Diagnostics and therapeutics, Cardiology, Time-frequency analysis, Wavelets, Heart, Absorbance, Image fusion, Near infrared

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SPIE Journal Paper | 25 November 2016 Open Access

Spatial probabilistic pulsatility model for enhancing photoplethysmographic imaging systems

Robert Amelard, David Clausi, Alexander Wong

JBO, Vol. 21, Issue 11, 116010, (November 2016) https://doi.org/10.1117/12.10.1117/1.JBO.21.11.116010

KEYWORDS: Photoplethysmography, Systems modeling, Blood, Data modeling, Statistical modeling, Heart, Imaging systems, Signal to noise ratio, Beam propagation method, Error analysis

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Proceedings Article | 10 March 2016 Paper

Photoplethysmographic imaging via spectrally demultiplexed erythema fluctuation analysis for remote heart rate monitoring

Jason Deglint, Audrey Chung, Brendan Chwyl, Robert Amelard, Farnoud Kazemzadeh, Xiao Yu Wang, David Clausi, Alexander Wong

Proceedings Volume 9701, 970111 (2016) https://doi.org/10.1117/12.2213532

KEYWORDS: Photoplethysmography, Heart, RGB color model, Imaging systems, Skin, Reflectivity, Motion analysis, Digital cameras, Video, Cameras, Sensors, Beam propagation method

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Proceedings Article | 10 March 2016 Paper

Spectral photoplethysmographic imaging sensor fusion for enhanced heart rate detection

Robert Amelard, David Clausi, Alexander Wong

Proceedings Volume 9701, 970113 (2016) https://doi.org/10.1117/12.2213687

KEYWORDS: Photoplethysmography, Heart, Sensors, Skin, Hemodynamics, Blood, Signal to noise ratio, Sensor fusion, Imaging systems, Fusion energy, Near infrared

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Proceedings Article | 10 March 2016 Paper

Non-contact hematoma damage and healing assessment using reflectance photoplethysmographic imaging

Robert Amelard, Kaylen Pfisterer, David Clausi, Alexander Wong

Proceedings Volume 9701, 970112 (2016) https://doi.org/10.1117/12.2213539

KEYWORDS: Optical components, Photoplethysmography, Tissues, Reflectivity, Visualization, Near infrared, Blood, Blood circulation, Wound healing, Data acquisition, Absorption, Imaging systems, Absorbance, Heart, Hemodynamics

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Proceedings Article | 3 September 2015 Paper

Multispectral digital holographic microscopy with applications in water quality assessment

Farnoud Kazemzadeh, Chao Jin, Mei Yu, Robert Amelard, Shahid Haider, Simarjeet Saini, Monica Emelko, David Clausi, Alexander Wong

Proceedings Volume 9579, 957906 (2015) https://doi.org/10.1117/12.2187705

KEYWORDS: Digital holography, Holography, Water, Microscopy, Microscopes, Imaging systems, Image resolution, Interferometry, Contamination, Sensors

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Proceedings Article | 5 March 2015 Paper

Non-contact assessment of melanin distribution via multispectral temporal illumination coding

Robert Amelard, Christian Scharfenberger, Alexander Wong, David Clausi

Proceedings Volume 9316, 93160N (2015) https://doi.org/10.1117/12.2078393

KEYWORDS: Light emitting diodes, Cameras, Skin, Chromophores, Ultraviolet radiation, Melanoma, Visible radiation, Electromagnetism, Imaging systems, Near infrared

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Proceedings Article | 5 March 2015 Paper

Illumination-compensated non-contact imaging photoplethysmography via dual-mode temporally coded illumination

Robert Amelard, Christian Scharfenberger, Alexander Wong, David Clausi

Proceedings Volume 9316, 931607 (2015) https://doi.org/10.1117/12.2078197

KEYWORDS: Cameras, Heart, Blood, Imaging systems, Light emitting diodes, Microcontrollers, Light sources and illumination, Light, Absorbance, Photoplethysmography

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Proceedings Article | 5 March 2015 Paper

High-resolution motion-compensated imaging photoplethysmography for remote heart rate monitoring

Audrey Chung, Xiao Yu Wang, Robert Amelard, Christian Scharfenberger, Joanne Leong, Jan Kulinski, Alexander Wong, David Clausi

Proceedings Volume 9316, 93160A (2015) https://doi.org/10.1117/12.2078397

KEYWORDS: Heart, Video, Skin, Imaging systems, Motion measurement, Beam propagation method, Independent component analysis, Blood, Biological research, Photoplethysmography

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Showing 5 of 17 publications

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