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Wyszukujesz frazę "Optical Coherence Tomography (OCT)" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    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:
    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:
    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:
    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
      Wyświetlanie 1-4 z 4

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