Prof. Valentina B. Vassilenko Profile

Prof. Valentina B. Vassilenko

at Univ Nova de Lisboa

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Author

Publications (8)

Proceedings Article | 21 December 2021 Paper

Instrumentation for differentiation of exhaled air

Paulo H. C. Santos, Valentina Vassilenko, Pedro Moura, Carolina Conduto, Jorge Fernandes, Paulo Bonifácio

Proceedings Volume 12126, 121262L (2021) https://doi.org/10.1117/12.2617391

KEYWORDS: Statistical analysis, Prototyping, Principal component analysis, Analytical research, Bioalcohols, Machine learning, Visualization, Biological research, Solids, Ions

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Breath analysis is an emerging research field with tremendous potential for advance personalized, non-invasive health screening and diagnostics,while new sampling instrumentation tools andanalytical detection methods are developed. Notwithstanding of the quick development of commercially and researcher-built experimental samplers, no robust and repeatable VOCs’ profile technologies have been clinically validated. Such is due to lack of an optimal standard procedure for selective breath sampling which ends in a wide range of contradictory reported results. Challenges of most breath samplers are also related to the substances’ concentrations that are source (oral cavity, oesophageal and alveolar) dependent and their low values (in ppbv - pptv range). Here, we present a suitable and novel technology for selectively sampling exhaled air regarding the subject’s: age, gender, metabolic production of CO2, smoking habits, nutrition and health conditions. The technology was aimed to perform real time flow measurements and collect a pre-determined portion of exhaled air by synchronizing a previously modelled respiratory cycle with the breathing cycle of the user. Through real-time synchronization of breathing cycles, the system can detect optimized sampling instants by machine learning-based algorithm. A first set of tests was conducted to evaluate the robustness and efficiency of the software’s sampling algorithm with two cohorts of participants (n=15 and n=30) with different age groups (2-5 years old and 18-27 years old, respectively). The ability to selectively differentiate exhaled air was also tested through collection and posterior analysis of oesophageal and alveolar air samples obtained from an independent cohort of university students (n=31). Although it requires instrumentation improvements and optimization the breath sampling technology coupled with an efficient analyser device (GC-IMS), the results herein presented suggest a promise step forward in breath sampling adapted to users’ age, genre and physiological condition.

Proceedings Article | 12 June 2020 Paper

Automated features analysis of patients with spinal diseases using medical thermal images

Valentina Vassilenko, Anna Poplavska, Sergiy Pavlov, Petro Kolisnyk, Oleksandr Poplavskyi, Sergiy Kolisnyk, Yuliia Vitrova, Waldemar Wójcik

Proceedings Volume 11456, 114560L (2020) https://doi.org/10.1117/12.2569780

KEYWORDS: Thermography, Temperature metrology, Cameras, Spine, Diagnostics, Infrared imaging, Image segmentation, Infrared cameras, Medical imaging, Infrared radiation

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Proceedings Article | 7 August 2017 Paper

Efficiency of optical-electronic systems: methods application for the analysis of structural changes in the process of eye grounds diagnosis

Yosyp Saldan, Sergii Pavlov, Dina Vovkotrub, Yulia Saldan, Valentina Vassilenko, Nadia Mazur, Daria Nikolaichuk, Waldemar Wójcik, Ryszard Romaniuk, Batyrbek Suleimenov, Ulan Bainazarov

Proceedings Volume 10445, 104450S (2017) https://doi.org/10.1117/12.2280977

KEYWORDS: Eye, Optical coherence tomography, Tomography, Fuzzy logic

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Proceedings Article | 28 September 2016 Paper

Device to determine the level of peripheral blood circulation and saturation

Tetyana Kozlovska, Sergii Sander, Sergii Zlepko, Valentina Vasilenko, Volodymyr Pavlov, Victoria Dumenko, Andrii Yu. Klapouschak, Marcin Maciejewski, Róża Dzierżak, Wojciech Surtel

Proceedings Volume 10031, 100312Z (2016) https://doi.org/10.1117/12.2249131

KEYWORDS: Photoplethysmography, Blood circulation, Blood, Optical fibers, Sensors, Photodetectors, Diagnostics, Tissue optics, Absorption, Biomedical optics

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Proceedings Article | 26 September 2016 Paper

Methods of processing biomedical image of retinal macular region of the eye

S. Pavlov, V. Vassilenko, I. Saldan, D. Vovkotrub, A. Poplavskaya, O. Kuzin

Proceedings Volume 9961, 99610X (2016) https://doi.org/10.1117/12.2237154

KEYWORDS: Eye, Biomedical optics, Retina, Optical coherence tomography, Image processing, Visualization, Image filtering, Tomography, Nerve, Tissue optics

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Proceedings Article | 17 December 2015 Paper

Laser photoplethysmography in integrated evaluation of collateral circulation of lower extremities

Sergii Sander, Tatiana Kozlovska, Valentina Vassilenko, Volodymyr Pavlov, Andrii Klapouschak, Piotr Kisała, Ryszard Romaniuk, Azhar Sagymbekova

Proceedings Volume 9816, 98161K (2015) https://doi.org/10.1117/12.2229042

KEYWORDS: Photoplethysmography, Arteries, Ischemia, Blood circulation, Diagnostics, Mercury, Skin, Surface plasmons, Analytical research, Blood

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Proceedings Article | 11 January 2013 Paper

Methods of processing biomedical image of retinal macular region of the eye

S. Pavlov, V. Vassilenko, D. Vovkotrub, A. Poplavskaya, O. Hotra

Proceedings Volume 8698, 86980A (2013) https://doi.org/10.1117/12.2019472

KEYWORDS: Retina, Image processing, Optical coherence tomography, Eye, Image filtering, Biomedical optics, Tomography, Nerve, Tissue optics, Visualization

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Proceedings Article | 11 January 2013 Paper

Methods and resources for imaging polarimetry

J. Rovira, S. Pavlov, V. Vassilenko, W. Wójcik, L. Sugurova

Proceedings Volume 8698, 86980T (2013) https://doi.org/10.1117/12.2019732

KEYWORDS: Polarimetry, Polarization, Sensors, Tissues, Polysomnography, Tissue optics, Light, Crystals, Image acquisition, Light scattering

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Showing 5 of 8 publications

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