Adam Liebert

Summary

Affiliation: Institute of Biocybernetics and Biomedical Engineering
Country: Poland

Publications

  1. doi request reprint Determination of absorption changes from moments of distributions of times of flight of photons: optimization of measurement conditions for a two-layered tissue model
    Adam Liebert
    Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 17:057005. 2012
  2. doi request reprint Time-resolved diffuse reflectance measurement carried out on the head of an adult at large source-detector separation
    Adam Liebert
    Institute of Biocybernetics and Biomedical Engineering, 02 109 Warsaw, Poland
    Conf Proc IEEE Eng Med Biol Soc 2010:5784-6. 2010
  3. ncbi request reprint Decomposition of a laser-Doppler spectrum for estimation of speed distribution of particles moving in an optically turbid medium: Monte Carlo validation study
    A Liebert
    Institute of Biocybernetics and Biomedical Engineering, Warsaw, Poland
    Phys Med Biol 51:5737-51. 2006
  4. ncbi request reprint Estimation of speed distribution of particles moving in an optically turbid medium using decomposition of a laser-Doppler spectrum
    Adam Liebert
    Institute of Biocyberentics and Biomedical Engineering, Warsaw, Poland
    Conf Proc IEEE Eng Med Biol Soc 2007:4080-2. 2007
  5. ncbi request reprint Non-invasive detection of fluorescence from exogenous chromophores in the adult human brain
    A Liebert
    Physikalisch Technische Bundesanstalt, Abbestr 2 12, 10587 Berlin, Germany
    Neuroimage 31:600-8. 2006
  6. ncbi request reprint Monte Carlo algorithm for efficient simulation of time-resolved fluorescence in layered turbid media
    A Liebert
    Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    Opt Express 16:13188-202. 2008
  7. doi request reprint Assessment of inflow and washout of indocyanine green in the adult human brain by monitoring of diffuse reflectance at large source-detector separation
    Adam Liebert
    Polish Academy of Sciences, Nalecz Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 16:046011. 2011
  8. doi request reprint Time-resolved detection of fluorescent light during inflow of ICG to the brain-a methodological study
    Daniel Milej
    Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
    Phys Med Biol 57:6725-42. 2012
  9. doi request reprint Multiwavelength time-resolved detection of fluorescence during the inflow of indocyanine green into the adult's brain
    Anna Gerega
    Nalecz Institute of Biocybernetics and Biomedical Engineering Polish Academy of Sciences, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 17:087001. 2012
  10. ncbi request reprint Time-resolved multidistance near-infrared spectroscopy of the adult head: intracerebral and extracerebral absorption changes from moments of distribution of times of flight of photons
    Adam Liebert
    Physikalisch Technische Bundesanstalt, Abbestrasse 2 12, 10587 Berlin, Germany
    Appl Opt 43:3037-47. 2004

Collaborators

Detail Information

Publications27

  1. doi request reprint Determination of absorption changes from moments of distributions of times of flight of photons: optimization of measurement conditions for a two-layered tissue model
    Adam Liebert
    Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 17:057005. 2012
    ..5. A reduction by another 4% can be achieved by additionally including the change in variance...
  2. doi request reprint Time-resolved diffuse reflectance measurement carried out on the head of an adult at large source-detector separation
    Adam Liebert
    Institute of Biocybernetics and Biomedical Engineering, 02 109 Warsaw, Poland
    Conf Proc IEEE Eng Med Biol Soc 2010:5784-6. 2010
    ..Time-courses of the moments of distributions of times of flight of photons are presented and compared with the results obtained simultaneously at shorter source-detector separations (3 cm, 4 cm and 5 cm)...
  3. ncbi request reprint Decomposition of a laser-Doppler spectrum for estimation of speed distribution of particles moving in an optically turbid medium: Monte Carlo validation study
    A Liebert
    Institute of Biocybernetics and Biomedical Engineering, Warsaw, Poland
    Phys Med Biol 51:5737-51. 2006
    ..Influence of multiple scattering of the photon is analysed and a perspective of spectrum decomposition under such conditions is considered. Potential applications and limitations of the method are discussed...
  4. ncbi request reprint Estimation of speed distribution of particles moving in an optically turbid medium using decomposition of a laser-Doppler spectrum
    Adam Liebert
    Institute of Biocyberentics and Biomedical Engineering, Warsaw, Poland
    Conf Proc IEEE Eng Med Biol Soc 2007:4080-2. 2007
    ..We conclude that the spectrum decomposition procedure can be successfully applied in analysis of the measured laser-Doppler spectra and the amount of information provided by laser-Doppler technique can be significantly increased...
  5. ncbi request reprint Non-invasive detection of fluorescence from exogenous chromophores in the adult human brain
    A Liebert
    Physikalisch Technische Bundesanstalt, Abbestr 2 12, 10587 Berlin, Germany
    Neuroimage 31:600-8. 2006
    ..In particular, we will discuss how these results serve as proof of concept for non-invasive fluorescence brain imaging and may thus open the door towards optical molecular imaging of the human brain...
  6. ncbi request reprint Monte Carlo algorithm for efficient simulation of time-resolved fluorescence in layered turbid media
    A Liebert
    Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    Opt Express 16:13188-202. 2008
    ..It was applied to a two-layered model mimicking intra- and extracerebral compartments of the adult human head...
  7. doi request reprint Assessment of inflow and washout of indocyanine green in the adult human brain by monitoring of diffuse reflectance at large source-detector separation
    Adam Liebert
    Polish Academy of Sciences, Nalecz Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 16:046011. 2011
    ....
  8. doi request reprint Time-resolved detection of fluorescent light during inflow of ICG to the brain-a methodological study
    Daniel Milej
    Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
    Phys Med Biol 57:6725-42. 2012
    ..It was also noted that the changes in moments of distributions of arrival times of fluorescence photons depend on the anatomical structure of the tissues located between the source and the detector...
  9. doi request reprint Multiwavelength time-resolved detection of fluorescence during the inflow of indocyanine green into the adult's brain
    Anna Gerega
    Nalecz Institute of Biocybernetics and Biomedical Engineering Polish Academy of Sciences, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 17:087001. 2012
    ....
  10. ncbi request reprint Time-resolved multidistance near-infrared spectroscopy of the adult head: intracerebral and extracerebral absorption changes from moments of distribution of times of flight of photons
    Adam Liebert
    Physikalisch Technische Bundesanstalt, Abbestrasse 2 12, 10587 Berlin, Germany
    Appl Opt 43:3037-47. 2004
    ..We validate our method by analyzing moments of DTOFs simulated for the assumed changes in absorption in different layers of the head model...
  11. ncbi request reprint Time-resolved optical imager for assessment of cerebral oxygenation
    Michal Kacprzak
    Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 12:034019. 2007
    ..Results of the tests on physical phantoms as well as in vivo validation of the instrument during the motor stimulation experiment are presented...
  12. doi request reprint Optical system based on time-gated, intensified charge-coupled device camera for brain imaging studies
    Piotr Sawosz
    Polish Academy of Sciences, Institute of Biocybernetics and Biomedical Engineering, Warsaw 02 109, Poland
    J Biomed Opt 15:066025. 2010
    ..Then, the decrease in absorption of the brain tissue related to increase in oxygenation was visualized in the motor cortex area during finger tapping by a healthy volunteer...
  13. doi request reprint Application of a time-resolved optical brain imager for monitoring cerebral oxygenation during carotid surgery
    Michal Kacprzak
    Nalecz Institute of Biocybernetics and Biomedical Engineering PAS, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 17:016002. 2012
    ..We concluded that intraoperative multichannel measurements allow for imaging of brain tissue hemodynamics. However, when monitoring the brain during carotid surgery, a single-channel measurement may be sufficient...
  14. doi request reprint Time-resolved near-infrared spectroscopy and imaging of the adult human brain
    Heidrun Wabnitz
    Physikalisch Technische Bundesanstalt, 10587 Berlin, Germany
    Adv Exp Med Biol 662:143-8. 2010
    ..The separation of cerebral and extracerebral changes of hemoglobin concentrations is demonstrated for a motor stimulation experiment...
  15. ncbi request reprint Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons
    Adam Liebert
    Physikalisch Technische Bundesanstalt, Abbestrasse 2 12, 10587 Berlin, Germany
    Appl Opt 42:5785-92. 2003
    ..The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue...
  16. doi request reprint Wavelength-resolved measurements of fluorescence lifetime of indocyanine green
    Anna Gerega
    Polish Academy of Sciences, Institute of Biocybernetics and Biomedical Engineering, Trojdena 4, 02 109 Warsaw, Poland
    J Biomed Opt 16:067010. 2011
    ..This effect should be taken into account when analyzing changes in the mean time of arrival of fluorescence photons excited in ICG dissolved in such optically turbid media...
  17. ncbi request reprint Optimization of the Monte Carlo code for modeling of photon migration in tissue
    Norbert S Zołek
    Institute of Biocybernetics and Biomedical Engineering PAS, 02 109 Warsaw, ul ks Trojdena 4, Poland
    Comput Methods Programs Biomed 84:50-7. 2006
    ..The proposed approximated algorithm allows to speed up the Monte Carlo simulations by a factor of 4. The developed code can be used on parallel machines, allowing for further acceleration...
  18. doi request reprint Laser-Doppler spectrum decomposition applied for the estimation of speed distribution of particles moving in a multiple scattering medium
    S Wojtkiewicz
    Institute of Biocybernetics and Biomedical Engineering, Warsaw, Poland
    Phys Med Biol 54:679-97. 2009
    ..We observed a linear relation between actual speed of milk solution and speed estimated from results of spectra decomposition...
  19. ncbi request reprint Time resolved optical spectroscopy system for cerebral oxygenation imaging
    R Maniewski
    Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, ul Trojdena 4, 02 109 Warsaw, Poland phone 48 22 6582884 fax 48 22 6597030 e mail
    Conf Proc IEEE Eng Med Biol Soc 1:201-4. 2005
    ..In the presented configuration it allows recording with 16 source-detector pairs forming a 4x4 grid. Some preliminary results of the laboratory tests and experimental trials curried out with various tissue phantoms are presented...
  20. ncbi request reprint Effectiveness of high resolution ECG spectral analysis in discrimination of patients prone to ventricular tachycardia and fibrillation
    T Mroczka
    Institute of Biocybernetics and Biomedical Engineering of Polish Academy of Sciences, Warsaw, Poland
    Med Sci Monit 6:1018-26. 2000
    ..The purpose of this study was to evaluate the effectiveness of these methods for predicting the risk of ventricular tachycardia and ventricular fibrillation in patients after myocardial infarction...
  21. ncbi request reprint Spectral analysis of laser-Doppler perfusion signal measured during thermal test
    R Maniewski
    Institute of Biocybernetics and Biomedical Engineering PAS, Warsaw, Poland
    Technol Health Care 7:163-9. 1999
    ..However, further studies are needed to improve the method to differentiate between primary and secondary Raynaud's patients...
  22. ncbi request reprint Multichannel laser-Doppler probe for blood perfusion measurements with depth discrimination
    A Liebert
    Institute of Biocybernetics and Biomedical Engineering PAS, Warsaw, Poland
    Med Biol Eng Comput 36:740-7. 1998
    ..A statistically significant increase of biological zero with distance between emitting and detecting fibres was noted...
  23. doi request reprint A Monte Carlo study of fluorescence generation probability in a two-layered tissue model
    Daniel Milej
    Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Ks Trojdena 4, 02 109 Warsaw, Poland
    Phys Med Biol 59:1407-24. 2014
    ....
  24. ncbi request reprint Fiber dispersion in time domain measurements compromising the accuracy of determination of optical properties of strongly scattering media
    Adam Liebert
    Physikalisch Technische Bundesanstalt, Abbestr 2 12, 10587 Berlin, Germany
    J Biomed Opt 8:512-6. 2003
    ..The relevance of the investigated dispersion effects is discussed with respect to frequency-domain measurements as well...
  25. ncbi request reprint Microcirculation in the diabetic foot as measured by a multichannel laser Doppler instrument
    Waldemar Karnafel
    Department of Gastroenterology and Metabolic Diseases, University School of Medicine, Warsaw, Poland
    Med Sci Monit 8:MT137-44. 2002
    ..All the parameters of postocclusive reactive hyperemia calculated from multichannel laser Doppler recordings were also evaluated to find the most valuable measure for diabetes examination...
  26. ncbi request reprint Postocclusive reactive hyperemia in healthy volunteers and patients with peripheral vascular disease measured by three noninvasive methods
    Tomaz Jarm
    University of Ljubljana, Faculty of Electrical Engineering, Trzaska 25, SI 1000 Ljubljana, Slovenia
    Adv Exp Med Biol 530:661-9. 2003
    ..The dynamics of the PORH response proved to be a better indicator of peripheral vascular disorder than the amplitude of responses...
  27. ncbi request reprint Dynamics of cortical neurovascular coupling analyzed by simultaneous DC-magnetoencephalography and time-resolved near-infrared spectroscopy
    Bruno Marcel Mackert
    Department of Neurology, Campus Benjamin Franklin, Charite Universitaetsmedizin Berlin, Hindenburgdamm 30, 12200 Berlin, Germany
    Neuroimage 39:979-86. 2008
    ..e., the coupling of neuronal and vascular/metabolic signals, in healthy subjects and provides a new analysis perspective for pathophysiological coupling concepts in diverse diseases, e.g., in stroke, hypertension and Alzheimer's disease...