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Polskiej Akademii Nauk

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M. Botwicz

Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)

Ostatnie publikacje
1.  Żołek N., Rix H., Botwicz M., Analysis of estimation of optical properties of sub superficial structures in multi layered tissue model using distribution function method, Computer Methods and Programs in Biomedicine, ISSN: 0169-2607, DOI: 10.1016/j.cmpb.2019.105084, Vol.183, pp.105084-1-9, 2020

Streszczenie:
Background and objective: This paper is focused on the analysis of a method of estimation of the absorption and scattering coefficients of nonhomogeneous two layered structures in time resolved near infrared spectroscopy using method based on cumulative distributions of time of flight of photons. Methods: The research is based on the analysis of the superposition of cumulative distributions of time of flight of photons. This approach allows for detailed analysis of small variations in characteristics of time of flight of photons caused by an electromagnetic propagation in highly scattering non-homogeneous media. The method presented, based on the variation of statistical minimum distance estimation, is compared to the method of standard curve fitting. It is analyzed by fitting the results obtained from Monte-Carlo simulations of light propagation in the turbid medium to the data from the simulated measurements. Results: The analysis is carried out for a vast range of optical properties of two layered medium in reflectance geometry. Conclusions: The method allows the estimation of the optical parameters despite the noise in the measured signal, with higher accuracy and generally with smaller number of error function evaluations.

Słowa kluczowe:
optical properties, approximation, light propagation, time of flight of photons, Monte-Carlo simulations, cumulative distributions

Afiliacje autorów:
Żołek N. - IPPT PAN
Rix H. - Signaux et Systèmes de Sophia Antipolis (FR)
Botwicz M. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
100p.
2.  Spinelli L., Botwicz M., Żołek N., Kacprzak M., Milej D., Sawosz P., Liebert A., Weigel U., Durduran T., Foschum F., Kienle A., Baribeau F., Leclair S., Bouchard J.P., Noiseux I., Gallant P., Mermut O., Farina A., Pifferi A., Torricelli A., Cubeddu R., Ho H.C., Mazurenka M., Wabnitz H., Klauenberg K., Bodnar O., Elster C., Bénazech-Lavoué M.Y., Bérubé-Lauzière Y., Lesage F., Khoptyar D., Subash A.A., Andersson-Engels S., Di Ninni P., Martelli F., Zaaccanti G., Determination of reference values for optical properties of liquid phantoms based on Intralipid and India ink, BIOMEDICAL OPTICS EXPRESS, ISSN: 2156-7085, DOI: 10.1364/BOE.5.002037, Vol.5, No.7, pp.2037-2053, 2014

Streszczenie:
A multi-center study has been set up to accurately characterize the optical properties of diffusive liquid phantoms based on Intralipid and India ink at near-infrared (NIR) wavelengths. Nine research laboratories from six countries adopting different measurement techniques, instrumental set-ups, and data analysis methods determined at their best the optical properties and relative uncertainties of diffusive dilutions prepared with common samples of the two compounds. By exploiting a suitable statistical model, comprehensive reference values at three NIR wavelengths for the intrinsic absorption coefficient of India ink and the intrinsic reduced scattering coefficient of Intralipid-20% were determined with an uncertainty of about 2% or better, depending on the wavelength considered, and 1%, respectively. Even if in this study we focused on particular batches of India ink and Intralipid, the reference values determined here represent a solid and useful starting point for preparing diffusive liquid phantoms with accurately defined optical properties. Furthermore, due to the ready availability, low cost, long-term stability and batch-to-batch reproducibility of these compounds, they provide a unique fundamental tool for the calibration and performance assessment of diffuse optical spectroscopy instrumentation intended to be used in laboratory or clinical environment. Finally, the collaborative work presented here demonstrates that the accuracy level attained in this work for optical properties of diffusive phantoms is reliable.

Afiliacje autorów:
Spinelli L. - Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie (IT)
Botwicz M. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Żołek N. - inna afiliacja
Kacprzak M. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Milej D. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Sawosz P. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Liebert A. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Weigel U. - ICFO, Institut de Ciències Fotòniques (ES)
Durduran T. - ICFO, Institut de Ciències Fotòniques (ES)
Foschum F. - Universit at Ulm (DE)
Kienle A. - Universit at Ulm (DE)
Baribeau F. - National Optics Institute (CA)
Leclair S. - National Optics Institute (CA)
Bouchard J.P. - National Optics Institute (CA)
Noiseux I. - National Optics Institute (CA)
Gallant P. - National Optics Institute (CA)
Mermut O. - National Optics Institute (CA)
Farina A. - Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie (IT)
Pifferi A. - Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie (IT)
Torricelli A. - Politecnico di Milano (IT)
Cubeddu R. - Politecnico di Milano (IT)
Ho H.C. - Industrial Technology Research Institute (TW)
Mazurenka M. - Physikalisch-Technische Bundesanstalt (DE)
Wabnitz H. - Physikalisch-Technische Bundesanstalt (DE)
Klauenberg K. - Physikalisch-Technische Bundesanstalt (DE)
Bodnar O. - PTB, Physikalisch-Technische Bundesanstalt (DE)
Elster C. - Physikalisch-Technische Bundesanstalt (DE)
Bénazech-Lavoué M.Y. - Université de Sherbrooke (CA)
Bérubé-Lauzière Y. - Université de Sherbrooke (CA)
Lesage F. - École Polytechnique de Montreal (CA)
Khoptyar D. - Lund University (SE)
Subash A.A. - Lund University (SE)
Andersson-Engels S. - Lund University (SE)
Di Ninni P. - University of Florence (IT)
Martelli F. - University of Florence (IT)
Zaaccanti G. - University of Florence (IT)
35p.
3.  Gerega A., Milej D., Weigl W., Botwicz M., Żołek N., Kacprzak M., Wierzejski W., Toczyłowska B., Mayzner-Zawadzka E., Maniewski R., Lieberta A., Multiwavelength time-resolved detection of fluorescence during the inflow of indocyanine green into the adult’s brain, JOURNAL OF BIOMEDICAL OPTICS, ISSN: 1083-3668, DOI: 10.1117/1.JBO.17.8.087001, Vol.17, No.8, pp.087001-1-9, 2012

Streszczenie:
Optical technique based on diffuse reflectance measurement combined with indocyanine green (ICG) bolus tracking is extensively tested as a method for clinical assessment of brain perfusion in adults at the bedside. Methodology of multiwavelength and time-resolved detection of fluorescence light excited in the ICG is presented and advantages of measurements at multiple wavelengths are discussed. Measurements were carried out: 1. on a physical homogeneous phantom to study the concentration dependence of the fluorescence signal, 2. on the phantom to simulate the dynamic inflow of ICG at different depths, and 3. in vivo on surface of the human head. Pattern of inflow and washout of ICG in the head of healthy volunteers after intravenous injection of the dye was observed for the first time with time-resolved instrumentation at multiple emission wavelengths. The multiwavelength detection of fluorescence signal confirms that at longer emission wavelengths, probability of reabsorption of the fluorescence light by the dye itself is reduced. Considering different light penetration depths at different wavelengths, and the pronounced reabsorption at longer wavelengths, the time-resolved multiwavelength technique may be useful in signal decomposition, leading to evaluation of extra- and intracerebral components of the measured signals

Słowa kluczowe:
indocyanine green bolus, near-infrared spectroscopy, fluorescence, time-resolved spectra, multiwavelength detection

Afiliacje autorów:
Gerega A. - inna afiliacja
Milej D. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Weigl W. - inna afiliacja
Botwicz M. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Żołek N. - inna afiliacja
Kacprzak M. - Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences (PL)
Wierzejski W. - inna afiliacja
Toczyłowska B. - inna afiliacja
Mayzner-Zawadzka E. - inna afiliacja
Maniewski R. - inna afiliacja
Lieberta A. - inna afiliacja
35p.

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