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    Wyświetlanie 1-7 z 7
    Tytuł:
    Examination of Sol-Gel Derived Hydroxyapatite Enhanced with Silver Nanoparticles using OCT and Raman Spectroscopy
    Autorzy:
    Głowacki, M. J.
    Gnyba, M.
    Strąkowska, P.
    Gardas, M.
    Kraszewski, M.
    Trojanowski, M.
    Strąkowski, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221475.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydroxyapatite
    sol-gel
    nanoparticles
    Raman spectroscopy
    optical coherence tomography (OCT)
    Opis:
    Hydroxyapatite (HAp) has been attracting widespread interest in medical applications. In a form of coating, it enables to create a durable bond between an implant and surrounding bone tissues. With addition of silver nanoparticles HAp should also provide antibacterial activity. The aim of this research was to evaluate the composition of hydroxyapatite with silver nanoparticles in a non-destructive and non-contact way. For control measurements of HAp molecular composition and solvent evaporation efficiency the Raman spectroscopy has been chosen. In order to evaluate dispersion and concentration of the silver nanoparticles inside the hydroxyapatite matrix, the optical coherence tomography (OCT) has been used. Five samples were developed and examined ‒ a reference sample of pure HAp sol and four samples of HAp colloids with different silver nanoparticle solution volume ratios. The Raman spectra for each solution have been obtained and analyzed. Furthermore, a transverse-sectional visualization of every sample has been created and examined by means of OCT.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 153-160
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optyczna koherentna tomografia OCT - nowe narzędzie do działań konserwatorskich i inwentaryzacyjnych
    Optical coherence tomography OCT - a novel tool for art conservation and cataloguing
    Autorzy:
    Targowski, P.
    Rouba, B.J.
    Karaszkiewicz, P.
    Iwanicka, M.
    Tymińska-Widmer, L.
    Łękawa-Wysłouch, T.
    Kwiatkowska, E.A.
    Sylwestrzak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/217772.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Konserwatorów Zabytków
    Tematy:
    tomografia OCT
    konserwacja
    inwentaryzacja
    OCT tomography
    cataloguing
    conservation
    Opis:
    Przedstawione zostaną przykłady obrazowania stratygrafii obrazów olejnych, w tym również w zastosowaniu do oceny autentyczności inskrypcji lub sygnatur. Poza tym omówione zostanie wykorzystanie OCT jako narzędzia wspomagającego stratygrafię LIBS, jak również do oceny zakresu korozji hydrologicznej szkła witrażowego oraz do monitorowania reakcji obiektu (obrazu) na zmianę warunków klimatycznych w jego otoczeniu.
    An application of OCT - a noninvasive diagnostic tool for examination of objects of art is discussed on the examples taken from research conducted at Nicolaus Copernicus University in Toruń, Poland. The following subjects have been discussed: stratigraphy of oil paintings on canvas, its specific application to analysis of order and authenticity of inscriptions on paintings, 'absolute' LIBS stratigraphy - OCT aided, application of OCT for examination of corrosion of stained glass, and monitoring of environmental induced deformations of canvas supports.
    Źródło:
    Wiadomości Konserwatorskie; 2009, 26; 94-107
    0860-2395
    2544-8870
    Pojawia się w:
    Wiadomości Konserwatorskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving Segmentation of 3D Retina Layers Based on Graph Theory Approach for Low Quality OCT Images
    Autorzy:
    Stankiewicz, A.
    Marciniak, T.
    Dąbrowski, A.
    Stopa, M.
    Rakowicz, P.
    Marciniak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/221548.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Optical Coherence Tomography (OCT)
    segmentation of retinal layers
    image segmentation
    graph theory
    Opis:
    This paper presents signal processing aspects for automatic segmentation of retinal layers of the human eye. The paper draws attention to the problems that occur during the computer image processing of images obtained with the use of the Spectral Domain Optical Coherence Tomography (SD OCT). Accuracy of the retinal layer segmentation for a set of typical 3D scans with a rather low quality was shown. Some possible ways to improve quality of the final results are pointed out. The experimental studies were performed using the so-called B-scans obtained with the OCT Copernicus HR device.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 269-280
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Denoising methods for improving automatic segmentation in OCT images of human eye
    Autorzy:
    Stankiewicz, A.
    Marciniak, T.
    Dąbrowski, A.
    Stopa, M.
    Rakowicz, P.
    Marciniak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201133.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography (OCT)
    image denoising
    image segmentation
    anisotropic diffusion
    wavelet thresholding
    koherentna tomografia optyczna
    OCT
    segmentacja obrazu
    dyfuzja anizotropowa
    Opis:
    This paper presents analysis of selected noise reduction methods used in optical coherence tomography (OCT) retina images (the socalled B-scans). The tested algorithms include median and averaging filtering, anisotropic diffusion, soft wavelet thresholding, and multiframe wavelet thresholding. Precision of the denoising process was evaluated based on the results of automated retina layers segmentation, since this stage (vital for ophthalmic diagnosis) is strongly dependent on the image quality. Experiments were conducted with a set of 3D low quality scans obtained from 10 healthy patients and 10 patients with vitreoretinal pathologies. Influence of each method on the automatic image segmentation for both groups of patients is thoroughly described. Manual annotations of investigated retina layers provided by ophthalmology experts served as reference data for evaluation of the segmentation algorithm.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 71-78
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Imaging of the lenses of the human eye by ultrabiomicroscopy (UBM), ultrasonography (USG) and by anterior segment optical coherence tomography (AS OCT): - presentation of clinical cases
    Autorzy:
    Porwik, E.
    Ciszewski, M.
    Mrukwa-Kominek, E.
    Smużyńska, M.
    Formińska-Kapuścik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333417.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    choroby oczu
    przypadki kliniczne
    obrazowanie soczewki
    ophthalmic diseases
    clinical cases
    lens imaging
    Opis:
    The nervous system's ability to receive light stimuli and its' processing in the brain in order to produce a visual impression is the definition of the sense of sight. The anatomical form of the sense organ of vision is comprised of the eyeball, the eye's protective apparatus, the eye's movement apparatus and the retinal nerve connections made to structures in the brain. The shape of the eye's lens, which gives the eye its refraction ability, depends on the voltage present in Zinn's ligaments that regulate the ciliary muscle. Sharpness of vision is produced by changing the shape of the lens, a reflexive adjustment. A domed lens causes stronger light inflexion and allows a sharp visual appearance of close objects. A flattening of the lens results in less light refraction and the seeing of more distant objects. The lens consists of a capsule, a cortex and a nucleus and it has two convex surfaces: the front and the rear. If we imagine the lens as a plum fruit, the capsule is its skin, the cortex is its flesh and the nucleus is its stone. Proper functioning of the lens is essential for accurate vision. Exact assessments of the eye's lens and the ability to monitor the status of associated diseases are extremely important. The lens may be tested using a slit lamp, but in any situation where an eye disease prevents this assessment of the lens this examination will obviously be inadequate. Thanks to today's imaging techniques, we can now assess the anatomical arrangement and condition of the lens, even in the eyes of those patients for whom the use of an imaging lens slit lamp is not possible [1, 2].
    Źródło:
    Journal of Medical Informatics & Technologies; 2012, 19; 49-57
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Common path optical coherence tomography with electronic feedback for improved sensitivity
    Autorzy:
    Alsnaie, Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/27310102.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical coherence tomography
    frequency domain
    OCT
    medical imaging
    partially coherent interferometers
    B-scan
    Opis:
    Optical coherence tomography (OCT) imaging has become a useful tool in medical diagnosis over the past 25 years, because of its ability to visualize intracellular structures at high resolution. The main objective of this work is to add electronic feedback to the optical coherence tomography setup to increase its sensitivity. Noise added to the measured interferogram obscures some details of examined tissue layered structure. Adjusting signal power level in such a way to improve signal-to-noise ratio can help to enhance image quality. Electronic feedback is added to enhance system sensitivity. A logarithmic amplifier is included in the OCT setup to automatically adapt signal level. Moreover, the resolution of the optical spectrum analyzer is controlled according to the farthest layer detected in the A-scan. These techniques are tested showing an improvement in obtained image of a human nail.
    Źródło:
    Optica Applicata; 2023, 53, 3; 495--504
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Readout System and Data Processing for OCT Pachymetry
    Autorzy:
    Dziewiecki, M.
    Domański, G.
    Frey, W.
    Konarzewski, B.
    Kurjata, R.
    Marzec, J.
    Smolnik, A.
    Zaremba, K.
    Ziembicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226782.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography
    pachymetry
    optical signal detection
    Opis:
    A complete system for measurement control, signal acquisition and data processing for an OCT pachymeter is described. Moreover, dedicated data processing algorithm used for noise reduction is presented. A simple OCT scanner was built and some measurements were performed to examine the capabilities of the system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 223-230
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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