1. Nicolaus Copernicus University

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    1. Mentioned In 163 Articles

    2. Intraframe motion correction for raster-scanned adaptive optics images using strip-based cross-correlation lag biases

      Intraframe motion correction for raster-scanned adaptive optics images using strip-based cross-correlation lag biases
      In retinal raster imaging modalities, fixational eye movements manifest as image warp, where the relative positions of the beam and retina change during the acquisition of single frames. To remove warp artifacts, strip-based registration methodsin which fast-axis strips from target images are registered to a reference framehave been applied in adaptive optics (AO) scanning light ophthalmoscopy (SLO) and optical coherence tomography (OCT). This approach has enabled object tracking and frame ...
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    3. Non invasive optical cellular imaging in humans

      Non invasive optical cellular imaging in humans
      One of the most appealing and still unsolved problems in biological and medical imaging is the possibility of noninvasive visualization of tissue in vivo with an accuracy of microscopic examination. A major difficulty to solve in biomedical imaging is a degradation of image quality caused by the presence of optical inhomogeneity of tissue. Is there any chance to develop a microscopic method that allows non-invasive observation of cells in living ...
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    4. Enhancing microvasculature maps for Optical Coherence Tomography - Angiography (OCT-A)

      Enhancing microvasculature maps for Optical Coherence Tomography - Angiography (OCT-A)
      OCT-A is becoming more popular in recent years and there is a high demand to improve the quality of angiograms as well as to extract quantitative information. We applied various processing methods for microvasculature enhancement like Hessian-Frangi to a data set obtained with Bessel and Gaussian OCT systems. We used angiogenesis, fractal and multifractal analysis to extract more quantitative information. We applied the processing methods for healthy, stroke, tumor progression ...
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    5. Assessment of the influence of viscoelasticity of cornea in animal ex vivo model using air‐puff optical coherence tomography and corneal hysteresis

      Assessment of the influence of viscoelasticity of cornea in animal ex vivo model using air‐puff optical coherence tomography and corneal hysteresis
      Application of the air‐puff swept source OCT (SS‐OCT) instrument to determine the influence of viscoelasticity on the relation between overall the air‐puff force and corneal apex displacement of porcine corneas ex vivo is demonstrated. Simultaneous recording of time‐evolution of the tissue displacement and air pulse stimulus allows obtaining valuable information related in part to the mechanical properties of the cornea. A novel approach based on quantitative ...
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    6. Post-doctoral Research Fellow Position and 2 PhD Studentships in Ophthalmic Imaging at the Nicolaus Copernicus University, Torun, Poland

      Post-doctoral Research Fellow Position and 2 PhD Studentships in Ophthalmic Imaging at the Nicolaus Copernicus University, Torun, Poland
      ...e project and application details: igrulkowski@fizyka.umk.pl  The Bio-Optics & Optical Engineering Lab at the Nicolaus Copernicus University invites applications for the positions in a project entitled Lenticular and vit...
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    7. Volumetric macro- and micro-scale assessment of crystalline lens opacities in cataract patients using long-depth-range swept source optical coherence tomography

      Volumetric macro- and micro-scale assessment of crystalline lens opacities in cataract patients using long-depth-range swept source optical coherence tomography
      We demonstrate an optimized optical platform for the three-dimensional (3-D) visualization of crystalline lens opacities in vivo in the eyes of patients with different types and grades of cataracts. We developed a prototype long-depth-range swept source optical coherence tomography (SS-OCT) instrument operating at the speed of 50 kA-scans/second and at the central wavelength of 1 m to perform high-resolution imaging of the whole anterior segment of the eye. Volumetric ...
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    8. Realistic simulation and experiment reveals the importance of scatterer microstructure in optical coherence tomography image formation

      Realistic simulation and experiment reveals the importance of scatterer microstructure in optical coherence tomography image formation
      Realistic simulation of image formation in optical coherence tomography, based on Maxwells equations, has recently been demonstrated for sample volumes of practical significance. Yet, there remains a limitation whereby reducing the size of cells used to construct a computational grid, thus allowing for a more realistic representation of scatterer microstructure, necessarily reduces the overall sample size that can be modelled. This is a significant problem since, as is well known ...
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    9. 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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    10. Using Optical Coherence Tomography to Reveal the Hidden History of The Landsdowne Virgin of the Yarnwinder by Leonardo da Vinci and Studio

      Using Optical Coherence Tomography to Reveal the Hidden History of The Landsdowne Virgin of the Yarnwinder by Leonardo da Vinci and Studio
      Optical coherence tomography (OCT) was used for non‐invasive examination of a well‐known, yet complex, painting from the studio of Leonardo da Vinci in combination with routine imaging in various bands of electromagnetic radiation. In contrast with these techniques, OCT provides depth‐resolved information. Three post‐processing modalities were explored: cross‐sectional views, maps of scattering from given depths, and their 3D models. Some hidden alterations of the painting ...
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    11. Three-Dimensional Cataract Crystalline Lens Imaging With Swept-Source Optical Coherence Tomography | IOVS

      Three-Dimensional Cataract Crystalline Lens Imaging With Swept-Source Optical Coherence Tomography | IOVS
      Purpose : To image, describe, and characterize different features visible in the crystalline lens of older adults with and without cataract when imaged three-dimensionally with a swept-source optical coherence tomography (SS-OCT) system. Methods : We used a new SS-OCT laboratory prototype designed to enhance the visualization of the crystalline lens and imaged the entire anterior segment of both eyes in two groups of participants: patients scheduled to undergo cataract surgery, n = 17 ...
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    12. Swept source optical coherence tomography and tunable lens technology for comprehensive imaging and biometry of the whole eye

      Swept source optical coherence tomography and tunable lens technology for comprehensive imaging and biometry of the whole eye
      Standard optical systems in ophthalmology are strictly dedicated either to retinal or to anterior segment imaging due to the refractive properties of the eye. We demonstrate a swept source optical coherence tomography platform with an electrically tunable lens (ETL) for versatile 3D in vivo imaging of both the eyes anterior segment and the retina. The optimized optical setup with adaptive operational states of the ETL permits focusing on the retina ...
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  2. About Nicolaus Copernicus University

    Nicolaus Copernicus University

    Nicolaus Copernicus University (NCU) founded in Torun in 1945 is one of the biggest academic institutions in Poland with the total number of 14 divisions, 54 faculties and 40.000 students. The Medical Physics Group is part of the Institute of Physics of the Nicolaus Copernicus University.  Department of Biophysics and Medical Physics at the Nicolaus Copernicus University.  The department members use both experimental (optics and optical spectroscopy) and theoretical (quantum chemistry and molecular dynamics) methods to investigate the structure and dynamic of biologically relevant molecules and tissues.  Nicolaus Copernicus University Collegium Medicum is the Medical College of NCU.