1. Articles mentioning both Maciej Szkulmowski and Nicolaus Copernicus University

    1-24 of 55 1 2 3 »
    1. Computationally effective 2D and 3D fast phase unwrapping algorithms and their applications to Doppler optical coherence tomography

      Computationally effective 2D and 3D fast phase unwrapping algorithms and their applications to Doppler optical coherence tomography
      We propose a simplification for a robust and easy to implement fast phase unwrapping (FPU) algorithm that is used to solve the phase wrapping problem encountered in various fields of optical imaging and metrology. We show that the number of necessary computations using the algorithm can be reduced compared to its original version. FPU can be easily extended from two to three spatial dimensions. We demonstrate the applicability of the ...
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    2. Retina Tomography and Optical Coherence Tomography in Eye Diagnostic System

      Retina Tomography and Optical Coherence Tomography in Eye Diagnostic System
      Eye diagnostic, two-step method based on retina color image and Optical Coherence Tomography is presented in this paper. A new robust algorithm, by which various eye diseases can be diagnosed, was implemented as an essential part of the work. The approach comprises two steps. The first one deals with the analysis of retina color image. In this stage, an algorithm was implemented to especially search hard exudates. If the algorithm ...
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    3. Feature Of The Week 10/08/2017: Optical Coherence Microscopy as a Novel, Non-Invasive Method for the 4D Live Imaging of Early Mammalian Embryos

      Feature Of The Week 10/08/2017: Optical Coherence Microscopy as a Novel, Non-Invasive Method for the 4D Live Imaging of Early Mammalian Embryos
      ...d preimplantation embryo diagnostics. For more information see recent Article . Courtesy Karol Karnowski from Nicolaus Copernicus University . Imaging of living cells based on traditional fluorescence and confocal laser ...
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    4. Optical coherence microscopy as a novel, non-invasive method for the 4D live imaging of early mammalian embryos

      Optical coherence microscopy as a novel, non-invasive method for the 4D live imaging of early mammalian embryos
      Imaging of living cells based on traditional fluorescence and confocal laser scanning microscopy has delivered an enormous amount of information critical for understanding biological processes in single cells. However, the requirement for a high numerical aperture and fluorescent markers still limits researchers ability to visualize the cellular architecture without causing short- and long-term photodamage. Optical coherence microscopy (OCM) is a promising alternative that circumvents the technical limitations of fluorescence imaging ...
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    5. Spectrometer calibration for spectroscopic Fourier domain optical coherence tomography

      Spectrometer calibration for spectroscopic Fourier domain optical coherence tomography
      We propose a simple and robust procedure for Fourier domain optical coherence tomography (FdOCT) that allows to linearize the detected FdOCT spectra to wavenumber domain and, at the same time, to determine the wavelength of light for each point of detected spectrum. We show that in this approach it is possible to use any measurable physical quantity that has linear dependency on wavenumber and can be extracted from spectral fringes ...
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    6. Extended-focus optical coherence microscopy for high-resolution imaging of the murine brain

      Extended-focus optical coherence microscopy for high-resolution imaging of the murine brain
      We propose a new method and optical instrumentation for mouse brain imaging based on extended-focus optical coherence microscopy. This in vivo imaging technique allows the evaluation of the cytoarchitecture at cellular level and the circulation system dynamics in three dimensions. This minimally invasive and non-contact approach is performed without the application of contrasting agents. The optical design achieved a resolution of 2.2 m over a distance of 800 m ...
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    7. Imaging of the stroke-related changes in the vascular system of the mouse brain with the use of extended focus Optical Coherence Microscopy

      Imaging of the stroke-related changes in the vascular system of the mouse brain with the use of extended focus Optical Coherence Microscopy
      We used Optical Coherence Microscopy (OCM) to monitor structural and functional changes due to ischemic stroke in small animals brains in vivo. To obtain lateral resolution of 2.2 m over the range of 600 m we used extended focus configuration of OCM instrument involving Bessel beam. It provided access to detailed 3D information about the changes in brain vascular system up to the level of capillaries across I and ...
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    8. Multimodal instrument for high-sensitivity autofluorescence and spectral optical coherence tomography of the human eye fundus

      Multimodal instrument for high-sensitivity autofluorescence and spectral optical coherence tomography of the human eye fundus
      ...ojtkowski »View Author Affiliations Katarzyna Komar,^1,^2 Patrycjusz Stremplewski,^1,^2 Marta Motoczyńska,^1 Maciej Szkulmowski,^1 and Maciej Wojtkowski^1,^* ^1Institute of Physics, Faculty of Physics, Astronomy and I...
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    9. Assessment of the flow velocity of blood cells in a microfluidic device using joint spectral and time domain optical coherence tomography

      Assessment of the flow velocity of blood cells in a microfluidic device using joint spectral and time domain optical coherence tomography
      ...and Maciej Wojtkowski »View Author Affiliations Danuta M. Bukowska,^1 Ladislav Derzsi,^2 Szymon Tamborski,^1 Maciej Szkulmowski,^1 Piotr Garstecki,^2 and Maciej Wojtkowski^1,^* ^1Institute of Physics, Faculty of Physi...
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    10. Quantitative lateral and axial flow imaging with optical coherence microscopy and tomography

      Quantitative lateral and axial flow imaging with optical coherence microscopy and tomography
      Optical coherence tomography (OCT) and optical coherence microscopy (OCM) allow the acquisition of quantitative three-dimensional axial flow by estimating the Doppler shift caused by moving scatterers. Measuring the velocity of red blood cells is currently the principal application of these methods. In many biological tissues, blood flow is often perpendicular to the optical axis, creating the need for a quantitative measurement of lateral flow. Previous work has shown that lateral ...
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    11. Angio-OCT as a noninvasive tool for three-dimensional vascular network visualization in retinal diseases

      Angio-OCT as a noninvasive tool for three-dimensional vascular network visualization in retinal diseases
      In this paper we demonstrate applicability of intensity-based optical coherence tomography technique for noninvasive visualization of 3D retinal microcapillary network. The study was performed with ultra high resolution and high speed (180,000 Ascans/sec) spectral optical coherence tomography (SOCT). New scanning protocols and data processing algorithms have been introduced to visualize microcapillary network. Moreover, results obtained in the eyes of healthy volunteers and patients with eye diseases were compared ...
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    12. Averaging techniques for OCT imaging

      Averaging techniques for OCT imaging
      State-of-the-art Fourier-domain optical coherence tomography (OCT) allows for the acquisition of up to millions of spectral fringes per second. This large amount of data can be used to improve the quality of structural tomograms after effective averaging. Here, we compare three OCT image improvement techniques: magnitude averaging, complex averaging, and spectral and time domain OCT (STdOCT). We evaluate the performance for images on both linear and logarithmic intensity scales and ...
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    13. Feature Of The Week 11/25/12: Nicolaus Copernicus University Presents Work on Four-Dimensional OCT Imaging Using Graphics Processing Units

      Feature Of The Week 11/25/12: Nicolaus Copernicus University Presents Work on Four-Dimensional OCT Imaging Using Graphics Processing Units
      ...esented. For more information see Article . Courtesy Marcin Sylwestrzak from Nicolaus Copernicus University . Nicolaus Copernicus University present the application of graphics processing unit (GPU) programming for real-...
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    14. Improved measurement of vibration amplitude in dynamic optical coherence elastography

      Improved measurement of vibration amplitude in dynamic optical coherence elastography
      Optical coherence elastography employs optical coherence tomography (OCT) to measure the displacement of tissues under load and, thus, maps the resulting strain into an image, known as an elastogram. We present a new improved method to measure vibration amplitude in dynamic optical coherence elastography. The tissue vibration amplitude caused by sinusoidal loading is measured from the spread of the Doppler spectrum, which is extracted using joint spectral and time domain ...
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    15. Four-dimensional structural and Doppler optical coherence tomography imaging on graphics processing units

      Four-dimensional structural and Doppler optical coherence tomography imaging on graphics processing units
      The authors present the application of graphics processing unit (GPU) programming for real-time three-dimensional (3-D) Fourier domain optical coherence tomography (FdOCT) imaging with implementation of flow visualization algorithms. One of the limitations of FdOCT is data processing time, which is generally longer than data acquisition time. Utilizing additional algorithms, such as Doppler analysis, further increases computation time. The general purpose computing on GPU (GPGPU) has been used successfully for structural ...
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    16. Optical Coherence Tomography Apparatus And Method With Speckle Suppression

      Optical Coherence Tomography Apparatus And Method With Speckle Suppression
      The invention relates to an optical coherence tomography apparatus and method. It improves speckle suppression by modifying the scanning trajectory (18) of the probing light beam so that groups of A scans close to the imaged segments (22) can be recorded and averaged. The invention facilitates effective speckle suppression combined with high resolution and little dependence of sample motions during the measurement.
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    17. Multi-parametric imaging of murine brain using spectral and time domain optical coherence tomography

      Multi-parametric imaging of murine brain using spectral and time domain optical coherence tomography
      Examination of brain functions in small animal models may help improve the diagnosis and treatment of neurological conditions. Transcranial imaging of small rodents brains poses a major challenge for optical microscopy. Another challenge is to reduce the measurement time. We describe methods and algorithms for three-dimensional assessment of blood flow in the brains of small animals, through the intact skull, using spectral and time domain optical coherence tomography. By introducing ...
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    18. Angiogram visualization and total velocity blood flow assessment based on intensity information analysis of OCT data

      Angiogram visualization and total velocity blood flow assessment based on intensity information analysis of OCT data
      We propose two independent OCT data processing methods allowing visualization and analysis of the blood flow. These methods utilize variations in the OCT intensity images caused by flowing blood. The first method calculates standard deviation of intensity to generate retinal OCT angiograms. We present algorithm of this method and results of application for visualization of the microvasculature in the macular area of the human eye in vivo. The second method ...
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    19. Microfluidics analysis of blood using joint spectral and time domain optical coherence tomography

      Microfluidics analysis of blood using joint spectral and time domain optical coherence tomography
      Although the Doppler Optical Coherence Tomography techniques have already enabled imaging of blood flow in large vessels in biological tissues, the generation of velocity maps of the capillary network is still a challenge. Since several important physiological and pathological phenomena occur in the microcirculation, the possibility of flow imaging and velocity assessment in microcapillaries may be important for medical diagnostics. Understanding of the origin of the Doppler signal in capillary ...
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    20. 1-24 of 55 1 2 3 »
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  2. Organizations in the News

    1. (3 articles) Ludwig Maximilian University of Munich
    2. (3 articles) Ecole Polytechnique Fédérale de Lausanne
    3. (2 articles) Massachusetts Institute of Technology
    4. (2 articles) Spanish National Research Council
    5. (1 articles) Medical University of Vienna
    6. (1 articles) Tufts University
    7. (1 articles) University of Pittsburgh
    8. (1 articles) University of Western Australia
  3. People in the News

    1. (46 articles) Maciej Wojtkowski
    2. (25 articles) Andrzej A. Kowalczyk
    3. (18 articles) Daniel Szlag
    4. (15 articles) Anna Szkulmowska
    5. (14 articles) Iwona Gorczynska
    6. (12 articles) Tomasz Bajraszewski
    7. (10 articles) Ireneusz Grulkowski
    8. (8 articles) Piotr Targowski
    9. (7 articles) Bartlomiej J. Kaluzny
    10. (7 articles) Michalina J. Góra
    11. (6 articles) Karol Karnowski
    12. (4 articles) Marcin Sylwestrzak
  4. OCT Companies in the News

    1. (6 articles) Optopol Technology
    2. (1 articles) Carl Zeiss Meditec