Prof. Janis Spigulis
Head of Biophotonics Lab at Univ of Latvia
SPIE Involvement:
Author | Editor | Student Chapter Advisor
Area of Expertise:
Biomedical Optics and Biophotonics , Fiber Optics , Photonic Instrumentation
Websites:
Profile Summary

J. Spigulis graduated as physicist from the University of Latvia in 1973. PhD thesis on optical processes in metal vapors have been defended in 1979, and Dr.Habil. Phys. thesis on novel optoelectronic methods and devices - in 1993. SInce 1986 his research is focused to fiberoptics, optoelectronics and biomedical optics; he established and leads the Bio-optics and Fibre-optics Laboratory at the Institute of Atomic Physics and Spectroscopy, University of Latvia (currently being Director of the Institute). His work has been related to design and investigation of optical fibre sensors, communication devices, medical lightguide systems and new types of the side-glowing optical fibres, as well as to development of novel optical methods for nonivasive clinical diagnostics and monitoring. Dr. Spigulis has developed lecture courses "Lightguide Physics", "Optoelectronics", “Laser Physics” and “Earth Physics” for BSc. students, as well as "Fundamentals of Biomedical Optics" and "Medical Lightguides" for MSc. students. In 1995 he launched the MSc program on Biomedical Optics at University of Latvia and actively co-ordinated this program over the following years.
J. Spigulis was the founder, chairman and co-chairman of the Baltic Chapter of SPIE – the International Society for Optical Engineering, he is a member of SPIE, Optical Society of America (OSA), Latvian Union of Scientists, Latvian Physical Society and Latvian Society of Medical Engineering and Physics. Currently he is presiding Latvian Regional Committee of ICO – International Commission for Optics, and the Latvian Local Section of OSA. In 2007 J. Spigulis became the Corresponding member of Latvian Academy of Sciences.
Publications (117)

Proceedings Article | 18 June 2024 Presentation + Paper
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

Proceedings Article | 2 October 2023 Poster + Paper
Ilze Ošina, Janis Spigulis
Proceedings Volume 12665, 126650T (2023) https://doi.org/10.1117/12.2687959
KEYWORDS: Skin, 3D modeling, Chromophores, Attenuation, Reflection, Melanoma, Light sources and illumination, Image segmentation

SPIE Journal Paper | 16 September 2022 Open Access
Ilze Ošina, Janis Spigulis, Ilona Kuzmina, Laura Dambite, Anna Berzina
JBO, Vol. 27, Issue 09, 095005, (September 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.9.095005
KEYWORDS: Skin, Pathology, Chromophores, 3D image processing, 3D modeling, Signal attenuation, Melanoma, Diagnostics, RGB color model, Tumor growth modeling

SPIE Journal Paper | 21 February 2022 Open Access
JBO, Vol. 27, Issue 02, 026004, (February 2022) https://doi.org/10.1117/12.10.1117/1.JBO.27.2.026004
KEYWORDS: Skin, Light emitting diodes, Prototyping, Chromophores, RGB color model, Cameras, Photons, Fiber optic illuminators, Image processing, Diagnostics

Proceedings Article | 9 December 2021 Paper
Ilze Oshina, Janis Spigulis
Proceedings Volume 11920, 119201X (2021) https://doi.org/10.1117/12.2615427
KEYWORDS: Skin, Chromophores, Scattering, Diffuse reflectance spectroscopy, Absorption, Rayleigh scattering, Mie scattering, Light scattering, Signal attenuation, Pathology

Proceedings Article | 9 December 2021 Paper
Proceedings Volume 11920, 119201V (2021) https://doi.org/10.1117/12.2615424
KEYWORDS: Monte Carlo methods, Skin, Optical fibers, Reflectivity, Tissue optics, Sensors, Absorption, Statistical modeling, Scattering, Optical testing

SPIE Journal Paper | 28 October 2021 Open Access
Ilze Oshina, Janis Spigulis
JBO, Vol. 26, Issue 10, 100901, (October 2021) https://doi.org/10.1117/12.10.1117/1.JBO.26.10.100901
KEYWORDS: Tissues, Tissue optics, Absorption, Scattering, Light scattering, Absorbance, Signal attenuation, Diagnostics, Skin, Oxygen

Proceedings Article | 28 October 2020 Paper
Janis Spigulis, Ilona Kuzmina, Ilze Lihacova, Vanesa Lukinsone, Blaž Cugmas, Andris Grabovskis, Edgars Kviesis-Kipge, Alexey Lihachev
Proceedings Volume 11585, 1158502 (2020) https://doi.org/10.1117/12.2581799

Proceedings Article | 28 October 2020 Paper
Proceedings Volume 11585, 115850E (2020) https://doi.org/10.1117/12.2581997

Proceedings Article | 28 October 2020 Paper
Ekaterina Borisova, Tsanislava Genova, Victoria Mircheva, Petranka Troyanova, Ivan Bratchenko, Lyudmila Bratchenko, Yulia Khristoforova, Valery Zakharov, Ilze Lihacova, Aleksejs Lihacovs, Janis Spigulis
Proceedings Volume 11585, 1158504 (2020) https://doi.org/10.1117/12.2581967

Proceedings Article | 20 August 2020 Presentation
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

Proceedings Article | 2 April 2020 Presentation + Paper
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

Proceedings Article | 2 April 2020 Presentation + Paper
Proceedings Volume 11363, 113630Z (2020) https://doi.org/10.1117/12.2555982
KEYWORDS: Skin, Luminescence, Diagnostics, Spectroscopy, Near infrared, Tissues, Melanoma, Pathology, Skin cancer, Ultraviolet radiation

Proceedings Article | 2 April 2020 Presentation + Paper
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

Proceedings Article | 11 March 2020 Paper
Proceedings Volume 11221, 112210R (2020) https://doi.org/10.1117/12.2560630
KEYWORDS: Light emitting diodes, Heart, Blood pressure, Body temperature, Temperature metrology, Cardiovascular system, Natural surfaces, Cardiovascular disorders, Near infrared, Tissues

Proceedings Article | 19 February 2020 Paper
Proceedings Volume 11211, 1121110 (2020) https://doi.org/10.1117/12.2544664
KEYWORDS: Skin, Visualization, Analog electronics, Multispectral imaging, RGB color model, Inflammation, Medicine, Dermatology, Hyperspectral imaging, Chromophores

Proceedings Article | 17 February 2020 Presentation + Paper
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

Proceedings Article | 17 February 2020 Paper
Proceedings Volume 11232, 112320N (2020) https://doi.org/10.1117/12.2559107
KEYWORDS: Raman spectroscopy, Skin, Diagnostics, Multispectral imaging, Luminescence, Prototyping, Fluorescence lifetime imaging, Light emitting diodes, Cameras, RGB color model

Proceedings Article | 14 February 2020 Paper
Blaž Cugmas, Aleksandar Plavšić, Eva Štruc, Jānis Spīgulis
Proceedings Volume 11247, 112470J (2020) https://doi.org/10.1117/12.2543858
KEYWORDS: Photoplethysmography, Blood, Sensors, Oximeters, Tissues, Tissue optics, MATLAB, Blood circulation, Blood pressure, Animal testing, Reproductive system

Proceedings Article | 22 July 2019 Paper
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

Proceedings Article | 22 July 2019 Paper
Proceedings Volume 11075, 110751F (2019) https://doi.org/10.1117/12.2526921
KEYWORDS: Skin, Speckle, Laser speckle contrast imaging, Diagnostics, Skin cancer, Diffuse reflectance spectroscopy, Tissues, Blood, Multispectral imaging, Hyperspectral imaging

Proceedings Article | 19 July 2019 Paper
Proceedings Volume 11073, 110731I (2019) https://doi.org/10.1117/12.2526386
KEYWORDS: Skin cancer, Skin, Light emitting diodes, Melanoma, Diagnostics, Cancer, Visualization, Infrared imaging, Infrared radiation, Dermatology, Multispectral imaging, Non-invasive medical diagnostics

Proceedings Article | 3 June 2019 Paper
V. Lukinsone, I. Kuzmina, R. Veilande, E. V. Plorina, D. Bliznuks, K. Bolochko, A. Derjabo, I. Lihacova, J. Spigulis
Proceedings Volume 11065, 110650A (2019) https://doi.org/10.1117/12.2518882
KEYWORDS: Skin, Melanoma, Diagnostics, Multispectral imaging, Diffuse reflectance spectroscopy, Light emitting diodes, RGB color model, Skin cancer, Image processing, Cameras

Proceedings Article | 4 March 2019 Presentation + Paper
Proceedings Volume 10881, 1088114 (2019) https://doi.org/10.1117/12.2508204
KEYWORDS: Skin, Chromophores, Prototyping, RGB color model, Forensic science, Image processing, Multispectral imaging, Fiber optic illuminators, Diffusers, Dermatology

Proceedings Article | 26 February 2019 Paper
Proceedings Volume 10868, 108681N (2019) https://doi.org/10.1117/12.2507620
KEYWORDS: CRTs, Visualization, Video, Capillaries, Tissues, Optical components, Teeth, Skin, Tissue optics, Cameras, Oximeters, Oximetry, Photoplethysmography, Blood circulation, Microcirculation imaging

Proceedings Article | 20 February 2019 Presentation + Paper
Proceedings Volume 10885, 108850I (2019) https://doi.org/10.1117/12.2507980
KEYWORDS: Medicine, Biomedical optics, Tumors, Oximeters, Thermography, Positron emission tomography, Oncology, Near infrared, Optical coherence tomography, Skin, Translational research, Animal testing, Biophotonic applications, Low-intensity laser therapy

Proceedings Article | 29 January 2019 Paper
Janis Spigulis, Alexey Lihachev, Vanesa Lukinsone, Martins Osis , Ilze Oshina
Proceedings Volume 11047, 1104703 (2019) https://doi.org/10.1117/12.2516747
KEYWORDS: Skin, Chromophores, Diagnostics, RGB color model, In vivo imaging, Picosecond phenomena, Luminescence, Image filtering, Cameras, Tumors

Proceedings Article | 29 January 2019 Paper
Ekaterina Borisova, Alexander Gisbrecht, Tsanislava Genova-Hristova, Petranka Troyanova, Elmira Pavlova, Nikolay Penkov, Ivan Bratchenko, Valery Zakharov, Ilze Lihachova, Ilona Kuzmina, Janis Spigulis
Proceedings Volume 11047, 1104704 (2019) https://doi.org/10.1117/12.2516337
KEYWORDS: Tissues, Skin, Luminescence, Fluorescence spectroscopy, Collagen, Pathology, Diagnostics, Signal detection

Proceedings Article | 20 February 2018 Paper
Proceedings Volume 10501, 1050117 (2018) https://doi.org/10.1117/12.2284794
KEYWORDS: Photoplethysmography, Oximeters, Diffuse reflectance spectroscopy, CRTs, Tissue optics, Capillaries, Skin, Sensors, Visualization, Tissues, Cameras, Video, Mouth

Proceedings Article | 7 December 2017 Paper
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

Proceedings Article | 7 December 2017 Paper
A. Lihachev, I. Lihacova, H. Heinrichs, J. Spigulis, T. Trebst, M Wehner
Proceedings Volume 10592, 105920D (2017) https://doi.org/10.1117/12.2297091
KEYWORDS: Tissues, Laser tissue interaction, Reflectivity, Tissue optics, Optical fibers, Signal detection, Temperature metrology, Laser welding, Semiconductor lasers, Spectroscopy

Proceedings Article | 28 July 2017 Paper
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

Proceedings Article | 28 July 2017 Paper
Marlon Garcia, Mirian Stringasci, Daniel Magalhães, Janis Spigulis, Vanderlei Bagnato, Sebastião Pratavieira
Proceedings Volume 10411, 1041108 (2017) https://doi.org/10.1117/12.2283246
KEYWORDS: RGB color model, Photodynamic therapy, Reflectivity

SPIE Journal Paper | 2 March 2017 Open Access
Janis Spigulis, Ilze Oshina, Anna Berzina, Alexander Bykov
JBO, Vol. 22, Issue 09, 091508, (March 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.9.091508
KEYWORDS: Skin, Chromophores, RGB color model, Image processing, Pathology, Cameras, Absorption, Monte Carlo methods, Imaging systems, Fiber optic illuminators

Proceedings Article | 15 February 2017 Paper
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

Proceedings Article | 5 January 2017 Paper
Proceedings Volume 10226, 1022615 (2017) https://doi.org/10.1117/12.2261817
KEYWORDS: Imaging spectroscopy, Spectroscopy, Skin, Tissues, Tumors, Luminescence, Collagen, Diagnostics, Chromophores, Signal detection

SPIE Journal Paper | 11 December 2015 Open Access
JBO, Vol. 20, Issue 12, 120502, (December 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.12.120502
KEYWORDS: Atrial fibrillation, Skin, Tumors, RGB color model, Tissues, Image filtering, Cameras, Auto-fluorescence imaging, Optical filters, Luminescence

SPIE Journal Paper | 25 September 2015 Open Access
Ilona Kuzmina, Matiss Lacis, Janis Spigulis, Anna Berzina, Lauma Valeine
JBO, Vol. 20, Issue 09, 090503, (September 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.9.090503
KEYWORDS: Skin, Chromophores, RGB color model, Cameras, In vitro testing, Light emitting diodes, In vivo imaging, Light sources, Galactic astronomy, Diagnostics

SPIE Journal Paper | 20 May 2015 Open Access
Janis Spigulis, Ilze Oshina
JBO, Vol. 20, Issue 05, 050503, (May 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.5.050503
KEYWORDS: Skin, RGB color model, Chromophores, Reflectivity, Image sensors, Cameras, Absorption, Image processing, Image segmentation, Calibration

Proceedings Article | 6 May 2015 Paper
Proceedings Volume 9504, 95040P (2015) https://doi.org/10.1117/12.2178827
KEYWORDS: Atrial fibrillation, Skin, Tissue optics, Tissues, Photon counting, In vivo imaging, Luminescence, Time correlated photon counting, Fluorescence spectroscopy, Single photon

Proceedings Article | 9 March 2015 Paper
Proceedings Volume 9332, 93320Y (2015) https://doi.org/10.1117/12.2077121
KEYWORDS: Skin, Absorption, Optical fibers, In vivo imaging, Reflectance spectroscopy, Spectroscopy, Near infrared spectroscopy, Light sources, Halogens, Near infrared

SPIE Journal Paper | 30 January 2015 Open Access
Inesa Ferulova, Alexey Lihachev, Janis Spigulis
JBO, Vol. 20, Issue 05, 051031, (January 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.5.051031
KEYWORDS: Skin, In vivo imaging, Luminescence, Continuous wave operation, Absorption, Picosecond phenomena, Laser irradiation, Molecular interactions, Molecular lasers, Pulsed laser operation

Proceedings Article | 22 October 2014 Paper
Dainis Jakovels, Inga Saknite, Gita Krievina, Janis Zaharans, Janis Spigulis
Proceedings Volume 9421, 94210J (2014) https://doi.org/10.1117/12.2084681
KEYWORDS: Skin, Blood circulation, Cell phones, Speckle, Imaging systems, Doppler effect, Laser speckle contrast imaging, Cameras, Blood, Clinical medicine

Proceedings Article | 17 July 2014 Open Access Paper
Natalija Lesina, Janis Spigulis
Proceedings Volume 9289, 92892I (2014) https://doi.org/10.1117/12.2070737
KEYWORDS: Photonics, Luminescence, Ultraviolet radiation, Gas lasers, Polarization, Liquid crystals, Infrared radiation, Physics, Diffraction, Atomic, molecular, and optical physics

Proceedings Article | 8 May 2014 Paper
Proceedings Volume 9129, 91293H (2014) https://doi.org/10.1117/12.2052596
KEYWORDS: Skin, Diffuse reflectance spectroscopy, Multispectral imaging, Luminescence, Light emitting diodes, Imaging systems, Absorption, Light sources, Reflectivity, Chromophores

Proceedings Article | 8 May 2014 Paper
Lasma Asare, Edgars Kviesis-Kipge, Janis Spigulis
Proceedings Volume 9129, 912933 (2014) https://doi.org/10.1117/12.2052254
KEYWORDS: Skin, Light emitting diodes, Signal detection, Sensors, Biological research, Biosensors, Blood, Infrared radiation, RGB color model, Photoplethysmography

Proceedings Article | 8 May 2014 Paper
Proceedings Volume 9129, 91293I (2014) https://doi.org/10.1117/12.2052614
KEYWORDS: Blood circulation, Skin, Speckle, Cell phones, Cameras, Image processing, Biomedical optics, RGB color model, Blood, MATLAB

Proceedings Article | 17 February 2014 Paper
Janis Spigulis, Liene Elste
Proceedings Volume 8937, 89370L (2014) https://doi.org/10.1117/12.2039442
KEYWORDS: RGB color model, Image sensors, Target detection, Multispectral imaging, Signal detection, Reflectivity, Skin, Seaborgium, Berkelium, Sensors

SPIE Journal Paper | 20 December 2013 Open Access
Dainis Jakovels, Ilona Kuzmina, Anna Berzina, Lauma Valeine, Janis Spigulis
JBO, Vol. 18, Issue 12, 126019, (December 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.12.126019
KEYWORDS: Skin, RGB color model, Phototherapy, Imaging systems, Multispectral imaging, Absorption, Laser therapeutics, Cameras, Polarizers, Optical inspection

Proceedings Article | 18 November 2013 Paper
Inga Saknite, Edgars Kviesis, Janis Spigulis
Proceedings Volume 9032, 90320O (2013) https://doi.org/10.1117/12.2045361
KEYWORDS: Absorption, Light emitting diodes, Skin, Photodiodes, Oscilloscopes, Diodes, Diffuse reflectance spectroscopy, Chromophores, Signal detection, Sensors

Proceedings Article | 18 November 2013 Paper
Inesa Ferulova, Alexey Lihachev, Janis Spigulis
Proceedings Volume 9032, 90320B (2013) https://doi.org/10.1117/12.2044688
KEYWORDS: Skin, Luminescence, In vivo imaging, Continuous wave operation, Tissue optics, Fluorescence spectroscopy, Spectroscopy, Laser therapeutics, Laser irradiation, Diffuse reflectance spectroscopy

Proceedings Article | 18 November 2013 Paper
A. Lihachev, D. Jakovels, I. Ferulova, J. Spigulis, M. Tamosiunas, S. Satkauskas, C. Lo, W. Chen
Proceedings Volume 9032, 90320D (2013) https://doi.org/10.1117/12.2044658
KEYWORDS: Luminescence, Ultrasonography, Fluorescence spectroscopy, Spectroscopy, In vitro testing, Fiber optics tests, Fiber optics, Oxygen, Acoustic cavitation, Molecules

Proceedings Article | 18 November 2013 Paper
D. Jakovels, A. Lihachev, J. Spigulis, S. Satkauskas, M. Tamosiunas, C. Lo, W. Chen
Proceedings Volume 9032, 90320E (2013) https://doi.org/10.1117/12.2044385
KEYWORDS: Green fluorescent protein, Luminescence, RGB color model, In vivo imaging, Imaging systems, Imaging devices, Proteins, Skin, Ultrasonography, Cameras

Proceedings Article | 18 November 2013 Paper
Proceedings Volume 9032, 903204 (2013) https://doi.org/10.1117/12.2044383
KEYWORDS: Principal component analysis, Skin, Melanoma, Multispectral imaging, Diagnostics, Neodymium, Ions, Skin cancer, Imaging systems, Directed energy weapons

Proceedings Article | 18 November 2013 Paper
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

Proceedings Article | 18 November 2013 Paper
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

Proceedings Article | 26 September 2013 Paper
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

Proceedings Article | 24 June 2013 Paper
Proceedings Volume 8803, 88030C (2013) https://doi.org/10.1117/12.2032526
KEYWORDS: Skin, Melanoma, Principal component analysis, Absorbance, Image analysis, Multispectral imaging, RGB color model, Diagnostics, Biomedical optics, Skin cancer

Proceedings Article | 18 June 2013 Paper
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

Proceedings Article | 18 June 2013 Paper
Proceedings Volume 8798, 87980X (2013) https://doi.org/10.1117/12.2032491
KEYWORDS: Melanoma, Skin, Diagnostics, Pathology, Light emitting diodes, Multispectral imaging, Cameras, Polarizers, Diffusers, Light sources

Proceedings Article | 18 June 2013 Paper
Proceedings Volume 8801, 880106 (2013) https://doi.org/10.1117/12.2032466
KEYWORDS: Light emitting diodes, Biosensors, Biological research, Blood, Tissue optics, Skin, Photodiodes, Sensors, Infrared radiation, Photoplethysmography

Proceedings Article | 18 June 2013 Paper
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

Proceedings Article | 13 March 2013 Paper
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

Proceedings Article | 6 March 2013 Paper
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

Proceedings Article | 19 October 2012 Paper
Proceedings Volume 8474, 84740K (2012) https://doi.org/10.1117/12.930952
KEYWORDS: Absorption, Skin, RGB color model, Chromophores, Cameras, Light emitting diodes, Visible radiation, Imaging spectroscopy, In vitro testing, Diodes

Proceedings Article | 8 May 2012 Paper
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

Proceedings Article | 8 May 2012 Paper
Proceedings Volume 8427, 842732 (2012) https://doi.org/10.1117/12.922301
KEYWORDS: Melanoma, Skin, Multispectral imaging, Absorbance, Pathology, Absorption, Blood, Cameras, Image processing, Clinical trials

Proceedings Article | 8 May 2012 Paper
Proceedings Volume 8427, 842737 (2012) https://doi.org/10.1117/12.922432
KEYWORDS: Skin, RGB color model, Laser therapeutics, Imaging systems, Chromophores, Cameras, Absorbance, Laser damage threshold, Reflectivity, Quantitative analysis

Proceedings Article | 8 May 2012 Paper
Proceedings Volume 8427, 84273I (2012) https://doi.org/10.1117/12.922601
KEYWORDS: Skin, Laser irradiation, Absorbance, Continuous wave operation, Diffuse reflectance spectroscopy, Absorption, Multispectral imaging, Spectroscopy, Cameras, Tissue optics

Proceedings Article | 29 February 2012 Paper
Proceedings Volume 8216, 82160L (2012) https://doi.org/10.1117/12.908967
KEYWORDS: RGB color model, Skin, Signal detection, Sensors, Light emitting diodes, Multispectral imaging, CMOS sensors, Seaborgium, Chromophores, Image sensors

Proceedings Article | 7 September 2011 Paper
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

Proceedings Article | 15 June 2011 Paper
Proceedings Volume 8087, 80872G (2011) https://doi.org/10.1117/12.889697
KEYWORDS: Melanoma, Skin, Multispectral imaging, Absorbance, Cameras, Diagnostics, Imaging spectroscopy, Oncology, Image processing, RGB color model

Proceedings Article | 15 June 2011 Paper
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

Proceedings Article | 15 June 2011 Paper
Alexey Lihachev, Kristine Rozniece, Janis Lesins, Janis Spigulis
Proceedings Volume 8087, 80872F (2011) https://doi.org/10.1117/12.889987
KEYWORDS: Skin, Pathology, Atrial fibrillation, Clinical trials, Diagnostics, Spectroscopy, Biomedical optics, Luminescence, In vivo imaging, Fiber lasers

Proceedings Article | 15 June 2011 Paper
Proceedings Volume 8087, 80872B (2011) https://doi.org/10.1117/12.889665
KEYWORDS: RGB color model, Skin, Light emitting diodes, LED lighting, Capillaries, Cameras, Blood, Imaging systems, Video, Laser therapeutics

Proceedings Article | 8 June 2011 Paper
Janis Lesins, Alexey Lihachev, Romualdas Rudys, Saulius Bagdonas, Janis Spigulis
Proceedings Volume 8092, 80920N (2011) https://doi.org/10.1117/12.889861
KEYWORDS: Skin, Luminescence, Atrial fibrillation, Laser safety, In vivo imaging, Spectroscopy, Laser irradiation, Safety, Imaging spectroscopy, Tissue optics

SPIE Journal Paper | 1 June 2011 Open Access
Ilona Kuzmina, Ilze Diebele, Dainis Jakovels, Janis Spigulis, Lauma Valeine, Janis Kapostinsh, Anna Berzina
JBO, Vol. 16, Issue 06, 060502, (June 2011) https://doi.org/10.1117/12.10.1117/1.3584846
KEYWORDS: Skin, Melanoma, Chromophores, Multispectral imaging, Absorbance, Pathology, RGB color model, Light scattering, Lamps, Image processing

Proceedings Article | 9 May 2011 Paper
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

SPIE Journal Paper | 1 April 2011 Open Access
Ilona Kuzmina, Ilze Diebele, Janis Spigulis, Lauma Valeine, Anna Berzina, Anita Abelite
JBO, Vol. 16, Issue 04, 040505, (April 2011) https://doi.org/10.1117/12.10.1117/1.3569119
KEYWORDS: Skin, Multispectral imaging, Diffuse reflectance spectroscopy, Absorption, Absorbance, Diagnostics, Optical fibers, Near infrared, Sensors, Inspection

Proceedings Article | 18 February 2011 Paper
Ilona Kuzmina, Ilze Diebele, Lauma Valeine, Dainis Jakovels, Anna Kempele, Janis Kapostinsh, Janis Spigulis
Proceedings Volume 7883, 788312 (2011) https://doi.org/10.1117/12.887207
KEYWORDS: Skin, Melanoma, Chromophores, Pathology, Clinical trials, Absorbance, Diagnostics, RGB color model, Multispectral imaging, Lamps

Proceedings Article | 25 November 2010 Paper
Proceedings Volume 7376, 737618 (2010) https://doi.org/10.1117/12.871452
KEYWORDS: Skin, Atrial fibrillation, RGB color model, Cameras, Data processing, Continuous wave operation, Diagnostics, Image acquisition, Fiber lasers, Imaging spectroscopy

Proceedings Article | 25 November 2010 Paper
Proceedings Volume 7376, 73760J (2010) https://doi.org/10.1117/12.873701
KEYWORDS: Skin, Laser therapeutics, Multispectral imaging, Polarizers, Cameras, Signal detection, Light emitting diodes, Argon ion lasers, Absorbance, Nd:YAG lasers

Proceedings Article | 18 May 2010 Paper
E. Kviesis-Kipge, E. Curkste, J. Spigulis, L. Eihvalde
Proceedings Volume 7715, 771523 (2010) https://doi.org/10.1117/12.854263
KEYWORDS: Capillaries, Skin, Infrared radiation, CRTs, Blue light emitting diodes, Light emitting diodes, Signal processing, Photodiodes, Blood vessels, Photoplethysmography

Proceedings Article | 18 May 2010 Paper
Proceedings Volume 7715, 77152Z (2010) https://doi.org/10.1117/12.853928
KEYWORDS: Skin, Chromophores, In vivo imaging, Absorption, Superposition, Associative arrays, Ultraviolet radiation, Chemical analysis, Image processing, Signal processing

Proceedings Article | 24 February 2010 Paper
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)

Proceedings Article | 2 December 2008 Paper
Proceedings Volume 7142, 71421C (2008) https://doi.org/10.1117/12.815948
KEYWORDS: Etching, Thin films, Wavefronts, Adaptive optics, Eye, Chalcogenides, Mirrors, Wet etching, Reflectivity, Refractive index

Proceedings Article | 5 June 2008 Paper
Janis Spigulis, Alexey Lihachev, Lasma Gailite, Renars Erts
Proceedings Volume 7022, 70220N (2008) https://doi.org/10.1117/12.803940
KEYWORDS: Skin, Luminescence, In vivo imaging, Blood, Laser applications, Spectroscopy, Semiconductor lasers, Fiber lasers, Reflection, Photoplethysmography

Proceedings Article | 2 May 2008 Paper
Janis Spigulis, Renars Erts, Vladimirs Nikiforovs, Edgars Kviesis-Kipge
Proceedings Volume 6991, 69912O (2008) https://doi.org/10.1117/12.801966
KEYWORDS: Sensors, Cell phones, Heart, Biomedical optics, Signal detection, Signal processing, Electronics, Light emitting diodes, Fiber optics sensors, Photoplethysmography

Proceedings Article | 11 July 2007 Paper
Janis Spigulis, Lasma Gailite, Renars Erts, Alexey Lihachev
Proceedings Volume 6628, 66281F (2007) https://doi.org/10.1117/12.727985
KEYWORDS: Skin, Signal detection, Blood, Absorbance, Spectroscopy, Reflection, Continuous wave operation, Shape analysis, Light emitting diodes, Photoplethysmography

Proceedings Article | 3 June 2007 Open Access Paper
Proceedings Volume 9665, 966524 (2007) https://doi.org/10.1117/12.2211133
KEYWORDS: Biomedical optics, Tissues, Tissue optics, Education and training, Physics, Mathematics, Biosensing, Medical laser equipment, Laser optics, Medicine

Proceedings Article | 3 June 2007 Open Access Paper
Proceedings Volume 9665, 96651C (2007) https://doi.org/10.1117/12.2207536
KEYWORDS: Biomedical optics, Physics, Tissues, LASIK, Medicine, Tissue optics, Laser safety, Waveguides, Laser applications, Physiology

Proceedings Article | 6 February 2007 Paper
Janis Spigulis, Lasma Gailite, Alexey Lihachev
Proceedings Volume 6430, 64301I (2007) https://doi.org/10.1117/12.724071
KEYWORDS: Skin, Blood, Signal detection, Absorbance, Spectroscopy, Reflection, Visible radiation, Continuous wave operation, Light emitting diodes, Photoplethysmography

Proceedings Article | 25 January 2007 Paper
Ilona Kuzmina, Alexey Lihachev, Lasma Gailite, Janis Spigulis
Proceedings Volume 6596, 65960T (2007) https://doi.org/10.1117/12.726455
KEYWORDS: Skin, Diffuse reflectance spectroscopy, Spectroscopy, Luminescence, Blood, Fluorescence spectroscopy, Absorption, Tissue optics, Sensors, Reflection

Proceedings Article | 13 June 2006 Paper
Proceedings Volume 5946, 59461R (2006) https://doi.org/10.1117/12.639414

Proceedings Article | 13 June 2006 Paper
Renars Erts, Indulis Kukulis, Jānis Spīgulis
Proceedings Volume 5946, 59461L (2006) https://doi.org/10.1117/12.639334

Proceedings Article | 8 October 2005 Paper
R. Erts, I. Kukulis, J. Spigulis, L. Kere
Proceedings Volume 5859, 58591K (2005) https://doi.org/10.1117/12.632883
KEYWORDS: Blood pressure, Heart, Software development, Neck, Blood, Data storage, Sensors, Skin, Signal detection, Photoplethysmography

Proceedings Article | 28 September 2005 Paper
Proceedings Volume 5952, 595203 (2005) https://doi.org/10.1117/12.622112
KEYWORDS: Optical fibers, Silica, Light sources, Scattering, Fiber lasers, Cladding, Light scattering, Safety, Infrared radiation, Diodes

Proceedings Article | 15 September 2005 Paper
R. Erts, J. Spigulis, M. Ozols
Proceedings Volume 5908, 59080J (2005) https://doi.org/10.1117/12.616297
KEYWORDS: Signal processing, Biosensing, Sensors, Software development, Neck, Electrocardiography, Calibration, Signal detection, Prototyping, Photoplethysmography

Proceedings Article | 1 September 2004 Paper
Janis Spigulis, Renars Erts, Indulis Kukulis, Maris Ozols, Karlis Prieditis
Proceedings Volume 5459, (2004) https://doi.org/10.1117/12.566082
KEYWORDS: Blood, Tissue optics, Skin, Signal detection, Sensors, Arteries, Resistance, Optical sensing, Data acquisition, Photoplethysmography

Proceedings Article | 1 July 2004 Paper
Janis Spigulis, Renars Erts, Maris Ozols
Proceedings Volume 5318, (2004) https://doi.org/10.1117/12.537529
KEYWORDS: Skin, Signal detection, Tissue optics, Sensors, Blood, Resistance, Wave propagation, Data acquisition, Signal processing, Photoplethysmography

Proceedings Article | 15 October 2003 Paper
Janis Spigulis, Renars Erts, Maris Ozols
Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500039
KEYWORDS: Sensors, Signal detection, Signal processing, Resistance, Internet, Tissue optics, Skin, Blood circulation, Blood, Photoplethysmography

Proceedings Article | 8 August 2003 Paper
Janis Spigulis, Maris Ozols, Renars Erts, Karlis Prieditis
Proceedings Volume 5123, (2003) https://doi.org/10.1117/12.517036
KEYWORDS: Tissue optics, Signal processing, Signal detection, Sensors, Blood vessels, Blood, Software development, Heart, Prototyping, Photoplethysmography

Proceedings Article | 8 August 2003 Paper
Martins Stagitis, Janis Spigulis
Proceedings Volume 5123, (2003) https://doi.org/10.1117/12.517000
KEYWORDS: Sensors, Optical fibers, Silica, Optical components, Prototyping, Light emitting diodes, Physics, Specialty optical fibers, Patents, Instrument modeling

Proceedings Article | 18 April 2003 Paper
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

Proceedings Article | 15 October 2002 Paper
Proceedings Volume 4903, (2002) https://doi.org/10.1117/12.486608
KEYWORDS: Biomedical optics, Laser therapeutics, LASIK, Medicine, Physics, Tissue optics, Laser safety, Laser applications, Tissues, Medical laser equipment

Proceedings Article | 4 June 2002 Paper
Janis Spigulis, Indulis Kukulis, Eva Fridenberga, Girts Venckus
Proceedings Volume 4625, (2002) https://doi.org/10.1117/12.469789
KEYWORDS: Signal detection, Diagnostics, Sensors, Tissue optics, Pathology, Blood vessels, Blood circulation, Signal processing, Arteries, Photoplethysmography

Proceedings Article | 8 March 2001 Paper
G. Revalde, Juris Silinsh, Janis Spigulis, Atis Skudra
Proceedings Volume 4318, (2001) https://doi.org/10.1117/12.417580
KEYWORDS: Light sources, Mercury, Electrodes, Vacuum ultraviolet, Infrared radiation, Rubidium, Zinc, Lead, Antimony, Bismuth

Proceedings Article | 8 March 2001 Paper
Janis Spigulis, Arturs Pfafrods
Proceedings Volume 4318, (2001) https://doi.org/10.1117/12.417620
KEYWORDS: Optical fibers, Light scattering, Silica, Scattering, Mechanical efficiency

Proceedings Article | 16 June 2000 Open Access Paper
Proceedings Volume 3831, (2000) https://doi.org/10.1117/12.388727
KEYWORDS: Biomedical optics, Physics, Laser therapeutics, Tissue optics, Laser dentistry, Waveguides, Medicine, Laser tissue interaction, Hard tissue optics, Tissues

Proceedings Article | 3 May 2000 Paper
Janis Spigulis, Girts Venckus, Maris Ozols
Proceedings Volume 3911, (2000) https://doi.org/10.1117/12.384891
KEYWORDS: Sensors, Signal processing, Signal detection, Diagnostics, Shape analysis, Tissue optics, Optical sensing, Head, Clinical trials, Optical amplifiers

Proceedings Article | 15 January 1999 Paper
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

Proceedings Article | 8 December 1997 Open Access Paper
Proceedings Volume 3190, (1997) https://doi.org/10.1117/12.294405
KEYWORDS: Biomedical optics, Tissue optics, Optical sensing, Diagnostics, Laser tissue interaction, Laser therapeutics

Proceedings Article | 18 April 1997 Paper
Janis Spigulis, Daumants Pfafrods
Proceedings Volume 2977, (1997) https://doi.org/10.1117/12.271010
KEYWORDS: Optical fibers, Laser therapeutics, Silica, Light sources, Phototherapy, Luminescence, Mirrors, Data modeling, Waveguides, Doppler effect

Proceedings Article | 4 February 1997 Paper
Janis Spigulis, Daumants Pfafrods, Maris Stafeckis, Wanda Jelinska-Platace
Proceedings Volume 2967, (1997) https://doi.org/10.1117/12.266542
KEYWORDS: Optical fibers, Scattering, Light sources, Light scattering, Optical design, Mirrors, Silica, Statistical modeling, Cladding, Light

Proceedings Article | 22 December 1994 Paper
Janis Spigulis, Daumants Pfafrods, Maris Stafeckis
Proceedings Volume 2328, (1994) https://doi.org/10.1117/12.197525
KEYWORDS: Optical fibers, Fiber lasers, Silica, Waveguides, Laser therapeutics, Laser development, Optics manufacturing, Endoscopy, High power lasers, Silicon

Proceedings Article | 15 March 1994 Paper
Proceedings Volume 2065, (1994) https://doi.org/10.1117/12.169380
KEYWORDS: Collimators, Solar concentrators, Optical components, Chemical elements, Collimation, Refraction, Reflection, Electroluminescence, Light sources, Neodymium

Proceedings Article | 10 March 1994 Paper
Janis Spigulis, Juris Lazdins, George Barens
Proceedings Volume 2068, (1994) https://doi.org/10.1117/12.170678
KEYWORDS: Optical fibers, Liquids, Fiber optics, Refractive index, Digital electronics, Neodymium, Chemical analysis, Signal processing, Mirrors, Calibration

Showing 5 of 117 publications
Proceedings Volume Editor (7)

SPIE Conference Volume | 2 November 2020

SPIE Conference Volume | 10 January 2018

SPIE Conference Volume | 18 November 2013

SPIE Conference Volume | 4 February 1997

Showing 5 of 7 publications
Conference Committee Involvement (14)
Third International Conference Biophotonics Riga 2020
24 August 2020 | Riga, Latvia
Preclinical and Clinical Optical Diagnostics
23 June 2019 | Munich, Germany
The Second International Conference "Biophotonics-Riga 2017"
27 August 2017 | Riga, Latvia
Clinical and Preclinical Optical Diagnostics
25 June 2017 | Munich, Germany
Eigth International Conference on Advanced Optical Materials and Devices
25 August 2014 | Riga, Latvia
Biophotonics-Riga 2013
26 August 2013 | Riga, Latvia
Laser Applications in Life Sciences
9 June 2010 | Oulu, Finland
Sixth International Conference on Advanced Optical Materials and Devices
24 August 2008 | Riga, Latvia
Sixth International Conference on Advanced Optical Materials and Devices
24 August 2008 | Riga, Latvia
Optical Fibers: Technology
2 September 2005 | Warsaw, Poland
Optical Fibers: Applications
1 September 2005 | Warsaw, Poland
Advanced Optical Devices, Technologies, and Medical Applications
1 January 2003 | Bellingham, WA, United States
Optical Inorganic Dielectric Materials and Devices
26 August 1996 | Riga, Latvia
International Conference on Advanced Optical Materials and Devices
26 August 1996 | Riga, Latvia
Showing 5 of 14 Conference Committees
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