Dr. Uldis Rubins Profile

Dr. Uldis Rubins

Senior Researcher at Univ of Latvia

SPIE Involvement:

Author

Publications (42)

Proceedings Article | 18 June 2024 Presentation + Paper

Diagnostic spectral imaging of skin and nasal mucosa by RGB laser-based prototype devices

Janis Spigulis, Uldis Rubins, Edgars Kviesis-Kipge, Inga Saknite, Ilze Oshina, Egija Vasilisina, Agate Krievina

Proceedings Volume 13009, 130090C (2024) https://doi.org/10.1117/12.3018710

KEYWORDS: Light sources and illumination, RGB color model, Skin, Prototyping, Endoscopy, Imaging spectroscopy, Diagnostics, Endoscopes, Cameras, Laser applications

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Proceedings Article | 5 March 2021 Poster + Presentation + Paper

Optical coherence tomography and Raman spectroscopy for ex vivo characterization of canine and feline skin and subcutaneous tumors: preliminary results

Blaž Cugmas, Daira Viškere, Oskars Čiževskis, Mikus Melderis, Uldis Rubins, Mindaugas Tamosiunas

Proceedings Volume 11636, 116360C (2021) https://doi.org/10.1117/12.2578725

KEYWORDS: Raman spectroscopy, Optical coherence tomography, Tumors, Skin, Tissues, Tissue optics, Spectrophotometry, Signal attenuation, Pathology, Near infrared

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Proceedings Article | 28 October 2020 Paper

Remote photoplethysmography device with adaptive illumination for skin microcirculation assessment

Edgars Kviesis-Kipge, Uldis Rubīns

Proceedings Volume 11585, 1158505 (2020) https://doi.org/10.1117/12.2581933

KEYWORDS: Skin, Video, Cameras, Blood, Photoplethysmography, Prototyping, Light emitting diodes

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Proceedings Article | 28 October 2020 Paper

Imaging photoplethysmography for evaluation of cutaneous sensory nerve fiber function

Z. Marcinkevics, A. Aglinska, U. Rubins, A. Mikale, A. Grabovskis

Proceedings Volume 11585, 1158507 (2020) https://doi.org/10.1117/12.2581705

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Proceedings Article | 28 October 2020 Paper

The assessment of gingivitis using remote photoplethysmography

Z. Marcinkevics, K. Ilango, P. Balode, U. Rubins, A. Grabovskis

Proceedings Volume 11585, 1158508 (2020) https://doi.org/10.1117/12.2581969

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Proceedings Article | 20 August 2020 Presentation

Skin chromophore mapping from multi-spectral laser line images

Ilze Ošina, Ilona Kuzmina, Uldis Rubins, Vanesa Lukinsone, Anna Maslobojeva, Laura Dambite, Margarita Matulenko, Zigmars Rupenheits, Janis Spigulis

Proceedings Volume 11483, 114830A (2020) https://doi.org/10.1117/12.2568069

KEYWORDS: Skin, Chromophores, In vivo imaging, Diagnostics, Cancer, Skin cancer, Prototyping, Tissue optics, Light scattering, Wound healing

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Proceedings Article | 2 April 2020 Presentation + Paper

Agar-based phantoms for skin diagnostic imaging

Ilona Kuzmina, Vanesa Lukinsone, Uldis Rubins, Ilze Osina, Laura Dambite, Anna Maslobojeva, Janis Spigulis

Proceedings Volume 11363, 113630F (2020) https://doi.org/10.1117/12.2555674

KEYWORDS: RGB color model, Skin, Prototyping, Absorption, Diffuse reflectance spectroscopy, Chromophores, Transmittance, Light emitting diodes, Optical properties, Scattering

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Proceedings Article | 2 April 2020 Presentation + Paper

Remitted photon path length in human skin, skin phantoms and cell cultures

V. Lukinsone, I. Kuzmina, M. Tamosiunas, A. Maslobojeva, M. Kuzminskis, U. Rubins, J. Spigulis

Proceedings Volume 11363, 1136320 (2020) https://doi.org/10.1117/12.2555822

KEYWORDS: Skin, Tissues, Photon transport, Chromophores, Picosecond phenomena, Light scattering, Time correlated photon counting

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Proceedings Article | 17 February 2020 Presentation + Paper

A snapshot multi-wavelengths imaging device for in-vivo skin diagnostics

Janis Spigulis, Zigmars Rupenheits, Margarita Matulenko, Ilze Oshina, Uldis Rubins

Proceedings Volume 11232, 112320I (2020) https://doi.org/10.1117/12.2547286

KEYWORDS: Skin, RGB color model, Chromophores, Cameras, Diagnostics, In vivo imaging, Imaging devices, Tissue optics, Prototyping, Image processing

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Proceedings Article | 9 September 2019 Presentation + Paper

Hybrid optical prototype for sepsis bedside diagnostics

M. Lācis, S. Kazune, Z. Marcinkevics, U. Rubins, A. Grabovskis

Proceedings Volume 11105, 111050P (2019) https://doi.org/10.1117/12.2529230

KEYWORDS: Skin, Diagnostics, Prototyping, Cameras, Thermography, Oxygen, Control systems, Blood, Light sources, Hybrid optics

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Proceedings Article | 22 July 2019 Paper

Towards direct measurements of remitted photon path lengths in skin: kinetic studies in the range 520-800 nm

V. Lukinsone, M. Osis, J. Latvels, I. Kuzmina, U. Rubins, N. Zorina, A. Maslobojeva, J. Spigulis

Proceedings Volume 11075, 1107505 (2019) https://doi.org/10.1117/12.2526663

KEYWORDS: Skin, Signal detection, Picosecond phenomena, Absorption, Tissues, Chromophores, Neodymium, Scattering, Data processing, Tissue optics

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Proceedings Article | 19 July 2019 Open Access

Remote photoplethysmography for assessment of oral mucosa

U. Rubins, Z. Marcinkevics, R. Muckle, I. Henkuzena, A. Roze, A. Grabovskis

Proceedings Volume 11073, 110731F (2019) https://doi.org/10.1117/12.2526979

KEYWORDS: Photoplethysmography, Video, Cameras, Light sources, Blood, Tissue optics, Video processing, Tissues, Modulation

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Proceedings Article | 19 July 2019 Paper

Remote photoplethysmography for skin perfusion monitoring using narrowband illumination

Z. Marcinkevics, U. Rubins, A. Aglinska, A. Caica, A. Grabovskis

Proceedings Volume 11073, 110730D (2019) https://doi.org/10.1117/12.2527221

KEYWORDS: Skin, Cameras, Photoplethysmography, Light sources, Doppler effect, Optical filters, Tissue optics, Video, Blood, Light emitting diodes

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Proceedings Article | 20 February 2019 Presentation + Paper

Imaging photoplethysmography for assessment of chronic pain patients

U. Rubins, Z. Marcinkevics, I. Logina, A. Grabovskis, E. Kviesis-Kipge

Proceedings Volume 10885, 1088508 (2019) https://doi.org/10.1117/12.2508393

KEYWORDS: Skin, Photoplethysmography, Video, Nerve, Cameras, Fiber optic illuminators, Axons, Doppler effect, Diagnostics, Light emitting diodes

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Proceedings Article | 17 May 2018 Open Access

Hyperspectral evaluation of skin blood oxygen saturation at baseline and during arterial occlusion

Z. Marcinkevics, U. Rubins, A. Grabovskis, J. Cimurs, A. Caica

Proceedings Volume 10685, 106851A (2018) https://doi.org/10.1117/12.2306131

KEYWORDS: Skin, Blood, Capillaries, Tissues, Oxygen, Blood oxygen saturation, Statistical analysis, Hyperspectral imaging, Diagnostics, Scattering

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Proceedings Article | 17 May 2018 Paper

Snapshot hyperspectral system for noninvasive skin blood oxygen saturation monitoring

U. Rubins, Z. Marcinkevics, J. Cimurs, A. Grabovskis, E. Kviesis-Kipge

Proceedings Volume 10685, 106853Y (2018) https://doi.org/10.1117/12.2306985

KEYWORDS: Skin, Cameras, Oxygen, Light emitting diodes, Prototyping, RGB color model, Blood, Blood oxygen saturation, Tissue optics, Light scattering

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Proceedings Article | 7 December 2017 Paper

Rosacea assessment by erythema index and principal component analysis segmentation maps

Ilona Kuzmina, Uldis Rubins, Inga Saknite, Janis Spigulis

Proceedings Volume 10592, 1059204 (2017) https://doi.org/10.1117/12.2285175

KEYWORDS: Image segmentation, Skin, RGB color model, Blood vessels, Principal component analysis, Image analysis, Image processing, Image processing algorithms and systems, Visualization, Biomedical optics

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Proceedings Article | 7 December 2017 Paper

pEGFP transfection into murine skeletal muscle by electrosonoporation

Mindaugas Tamošiūnas, Dainis Jakovels, Uldis Rubins, Roberts Kadikis, Ramona Petrovska, Saulius Šatkauskas

Proceedings Volume 10592, 105920L (2017) https://doi.org/10.1117/12.2297222

KEYWORDS: Green fluorescent protein, Multispectral imaging, Fluorescence spectroscopy, In vivo imaging, Skin, Image processing

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Proceedings Article | 7 December 2017 Paper

Remote photoplethysmography system for unsupervised monitoring regional anesthesia effectiveness

U. Rubins, A. Miscuks, Z. Marcinkevics, M. Lange

Proceedings Volume 10592, 1059203 (2017) https://doi.org/10.1117/12.2297158

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Proceedings Article | 7 December 2017 Paper

Evaluation of nitroglycerin effect on remote photoplethysmogram waveform acquired at green and near infra-red illumination

Z. Marcinkevics, U. Rubins, A. Caica, A. Grabovskis

Proceedings Volume 10592, 105920E (2017) https://doi.org/10.1117/12.2297385

KEYWORDS: Hemodynamics, Skin, Heart, Resistance, Video, Video processing, Signal processing, Signal to noise ratio, Photoplethysmography, Infrared imaging

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Proceedings Article | 28 July 2017 Paper

Comparison of remote photoplethysmography signals acquired by ultra-low noise camera and conventional camera during physiological tests

U. Rubins, Z. Marcinkevics

Proceedings Volume 10411, 104110T (2017) https://doi.org/10.1117/12.2284657

KEYWORDS: Cameras, Skin, Blood

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Proceedings Article | 28 July 2017 Paper

Express RGB mapping of three to five skin chromophores

Ilze Oshina, Janis Spigulis, Uldis Rubins, Edgars Kviesis-Kipge , Kalvis Lauberts

Proceedings Volume 10413, 104130M (2017) https://doi.org/10.1117/12.2285995

KEYWORDS: Skin, Chromophores, Multispectral imaging, Laser applications

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Proceedings Article | 15 February 2017 Paper

Novel hybrid technology for early diagnostics of sepsis

Inga Saknite, Andris Grabovskis, Sigita Kazune, Uldis Rubins, Zbignevs Marcinkevics, Karina Volceka, Edgars Kviesis-Kipge, Janis Spigulis

Proceedings Volume 10057, 100570F (2017) https://doi.org/10.1117/12.2253597

KEYWORDS: Diagnostics, Tissues, Hyperspectral imaging, Oxygen, Thermography, Cameras, Imaging spectroscopy, Blood circulation, Visualization, Skin, Image segmentation, RGB color model, Blood

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SPIE Journal Paper | 30 March 2016 Open Access

Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

Zbignevs Marcinkevics, Uldis Rubins, Janis Zaharans, Aleksejs Miščuks, Evelina Urtane, Liga Ozolina-Moll

JBO, Vol. 21, Issue 03, 035005, (March 2016) https://doi.org/10.1117/12.10.1117/1.JBO.21.3.035005

KEYWORDS: Photoplethysmography, Skin, Imaging systems, Video, Light sources, Cameras, Blood, Capillaries, In vivo imaging, Software development

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SPIE Journal Paper | 26 March 2015 Open Access

Errata: Two-stage multi-Gaussian fitting of conduit artery photoplethysmography waveform during induced unilateral hemodynamic events

Andris Grabovskis, Zbignevs Marcinkevics, Uldis Rubins, Juris Imants Aivars

JBO, Vol. 20, Issue 03, 039801, (March 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.3.039801

KEYWORDS: Arteries, Hemodynamics, Biomedical optics, Atomic, molecular, and optical physics, Spectroscopy, Biology, Physiology, Photoplethysmography

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SPIE Journal Paper | 9 March 2015 Open Access

Two-stage multi-Gaussian fitting of conduit artery photoplethysmography waveform during induced unilateral hemodynamic events

Andris Grabovskis, Zbignevs Marcinkevics, Uldis Rubins, Juris Imants Aivars

JBO, Vol. 20, Issue 03, 035001, (March 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.3.035001

KEYWORDS: Arteries, Hemodynamics, Blood circulation, Resistance, Resolution enhancement technologies, Statistical analysis, Amplifiers, Ultrasonography, Diagnostics, Photoplethysmography

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Proceedings Article | 18 November 2013 Paper

Multimodal device for assessment of skin malformations

A. Bekina, V. Garancis, U. Rubins, J. Spigulis, L. Valeine, A. Berzina

Proceedings Volume 9032, 903207 (2013) https://doi.org/10.1117/12.2044142

KEYWORDS: Skin, Chromophores, Infrared imaging, Infrared radiation, Diagnostics, Absorption, Imaging devices, Light emitting diodes, CMOS sensors, Multispectral imaging

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Proceedings Article | 18 November 2013 Paper

Application of colour magnification technique for revealing skin microcirculation changes under regional anaesthetic input

Uldis Rubins, Janis Spigulis, Aleksejs Miscuks

Proceedings Volume 9032, 903203 (2013) https://doi.org/10.1117/12.2044574

KEYWORDS: Video, Skin, Video processing, Blood, Algorithm development, Signal processing, Cameras, Software development, Electronic filtering, Visualization

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Proceedings Article | 26 September 2013 Paper

Skin chromphore mapping by means of a modified video-microscope for skin malformation diagnosis

Amina Bekina, Uldis Rubins, Ilze Lihacova, Janis Zaharans, Janis Spigulis

Proceedings Volume 8856, 88562G (2013) https://doi.org/10.1117/12.2023960

KEYWORDS: Skin, Chromophores, Blood, Tissue optics, Image analysis, Microscopes, Calibration, Multispectral imaging, Light emitting diodes, Infrared radiation

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Proceedings Article | 18 June 2013 Paper

Semi-automatic detection of skin malformations by analysis of spectral images

U. Rubins, J. Spigulis, L. Valeine, A. Berzina

Proceedings Volume 8798, 87980S (2013) https://doi.org/10.1117/12.2032522

KEYWORDS: Skin, Chromophores, Image analysis, Light emitting diodes, Image segmentation, Imaging spectroscopy, Algorithm development, Detection and tracking algorithms, Infrared imaging, Biomedical optics

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Proceedings Article | 18 June 2013 Paper

Skin chromophore mapping by modified video-microscope

Amina Bekina, Uldis Rubins, Janis Zaharans, Janis Spigulis

Proceedings Volume 8798, 87980T (2013) https://doi.org/10.1117/12.2032523

KEYWORDS: Skin, Chromophores, Blood, Tissue optics, Microscopes, Light emitting diodes, Infrared imaging, Calibration, Biomedical optics, Multispectral imaging

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Proceedings Article | 13 March 2013 Paper

A device for multimodal imaging of skin

Janis Spigulis, Valerijs Garancis, Uldis Rubins, Eriks Zaharans, Janis Zaharans, Liene Elste

Proceedings Volume 8574, 85740J (2013) https://doi.org/10.1117/12.2003510

KEYWORDS: Skin, Light emitting diodes, Diagnostics, Chromophores, Imaging devices, Video, LED lighting, Multimodal imaging, Prototyping, Blood

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Proceedings Article | 6 March 2013 Paper

LASCA and PPG imaging for non-contact assessment of skin blood supply

Dainis Jakovels, Uldis Rubins, Janis Spigulis

Proceedings Volume 8668, 866849 (2013) https://doi.org/10.1117/12.2007375

KEYWORDS: Blood circulation, Skin, Blood, Cameras, Speckle, CMOS cameras, Imaging devices, Imaging systems, Semiconductor lasers, Photoplethysmography

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SPIE Journal Paper | 1 February 2013 Open Access

Effect of probe contact pressure on the photoplethysmographic assessment of conduit artery stiffness

Andris Grabovskis, Zbignevs Marcinkevics, Uldis Rubins, Edgars Kviesis-Kipge

JBO, Vol. 18, Issue 02, 027004, (February 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.2.027004

KEYWORDS: Arteries, Biomedical optics, Transducers, Ultrasonography, Reflectivity, Sensors, Standards development, Skin, Linear filtering, Photoplethysmography

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Proceedings Article | 8 May 2012 Paper

Clinical measurements with multi-spectral photoplethysmography sensors

Lasma Asare, Maris Ozols, Uldis Rubins, Oskars Rubenis, Janis Spigulis

Proceedings Volume 8427, 842734 (2012) https://doi.org/10.1117/12.922361

KEYWORDS: Light emitting diodes, Skin, Biosensors, Sensors, Signal processing, Tissue optics, Signal detection, Prototyping, Photodiodes, Photoplethysmography

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Proceedings Article | 8 May 2012 Paper

Photoplethysmography system for blood pulsation detection in unloaded artery conditions

A. Grabovskis, Z. Marcinkevics, O. Rubenis, U. Rubins, V. Lusa

Proceedings Volume 8427, 84270L (2012) https://doi.org/10.1117/12.922649

KEYWORDS: Arteries, Blood, Tissues, Signal processing, Heart, Amplifiers, Skin, Sensors, Light emitting diodes, Photoplethysmography

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Proceedings Article | 7 September 2011 Paper

RGB imaging system for mapping and monitoring of hemoglobin distribution in skin

Dainis Jakovels, Uldis Rubins, Janis Spigulis

Proceedings Volume 8158, 81580R (2011) https://doi.org/10.1117/12.893789

KEYWORDS: Skin, RGB color model, Imaging systems, Chromophores, Absorbance, Cameras, Blood, Signal analyzers, Blood circulation, Absorption

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Proceedings Article | 15 June 2011 Paper

Multi-spectral photoplethysmography technique for parallel monitoring of pulse shapes at different tissue depths

Lasma Asare, Edgars Kviesis-Kipge, Uldis Rubins, Oskars Rubenis, Janis Spigulis

Proceedings Volume 8087, 80872E (2011) https://doi.org/10.1117/12.889954

KEYWORDS: Tissue optics, Biosensors, Signal processing, Hemodynamics, Skin, Blood, Semiconductor lasers, Photodiodes, Signal detection, Photoplethysmography

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Proceedings Article | 9 May 2011 Paper

Multi-spectral photoplethysmography biosensor

L. Asare, E. Kviesis-Kipge, A. Grabovskis, U. Rubins, J. Spigulis, R. Erts

Proceedings Volume 8073, 80731Z (2011) https://doi.org/10.1117/12.887176

KEYWORDS: Biosensors, Semiconductor lasers, Photodiodes, Signal processing, Sensors, Skin, Capacitors, Hemodynamics, Tissue optics, Photoplethysmography

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Proceedings Article | 24 February 2010 Paper

Multi-spectral skin imaging by a consumer photo-camera

Janis Spigulis, Dainis Jakovels, Uldis Rubins

Proceedings Volume 7557, 75570M (2010) https://doi.org/10.1117/12.845492

KEYWORDS: Skin, Cameras, Sensors, Optical filters, RGB color model, Image processing, CCD image sensors, CMOS sensors, Image filtering, Filtering (signal processing)

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Proceedings Article | 18 April 2003 Paper

Micro-circulation of skin blood: optical monitoring by advanced photoplethysmography techniques

Janis Spigulis, Renars Erts, Uldis Rubins

Proceedings Volume 5119, (2003) https://doi.org/10.1117/12.498725

KEYWORDS: Blood, Skin, Arteries, Tissue optics, Signal detection, Sensors, Blood circulation, Wave propagation, Signal processing, Photoplethysmography

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Proceedings Article | 15 January 1999 Paper

Photoplethysmographic sensor with smoothed output signals

Janis Spigulis, Uldis Rubins

Proceedings Volume 3570, (1999) https://doi.org/10.1117/12.336933

KEYWORDS: Signal detection, Sensors, Algorithm development, Signal processing, Neck, Heart, Smoothing, Light emitting diodes, Fiber optics sensors, Photoplethysmography

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Showing 5 of 42 publications

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