1. Articles from Tarek A. Al-Saeed

    1-4 of 4
    1. Dispersion, spot size and speckle noise effects in Fourier-domain optical coherence tomography

      Dispersion, spot size and speckle noise effects in Fourier-domain optical coherence tomography

      In this work we present a rigorous analysis of the propagation of light wave through the sample in Fourier-domain optical coherence tomography (FD-OCT). We considered a sample with four layers having refractive index dispersion. We assumed that light wave is a Gaussian beam propagating through the sample. We consider the radius of the beam under different circumstances. Beam radius accounts for diffraction and lateral resolution. We varied different parameters like focal length, depth of focus, tilt of the sample and center wavelength and calculated beam radius under variation of these parameters. Then we considered the interferogram under dispersion, dispersion free ...

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    2. Time-domain optical coherence tomography system based on moving-optical-wedge interferometer

      Time-domain optical coherence tomography system based on moving-optical-wedge interferometer

      In this work we present a time-domain optical coherence tomography system based on moving-optical-wedge interferometer. This device has the advantage of suppressing motion artifact. The major problem with such a system is dispersion in the wedge material. We propose an algorithm for compensation of such dispersion. Moreover, we investigate the effect of dispersion in resolution. So, we introduced artificial high dispersion in the wedge material to clarify this effect. Resolution is improved from 10 µm to 5 µm. Thus we can consider dispersion is a bless in improving resolution.

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    3. Study of dual-source Fourier-domain optical coherence tomography

      Study of dual-source Fourier-domain optical coherence tomography

      Optical coherence tomography (OCT) is a very high-resolution imaging technique whose resolution depends on source bandwidth. Improving resolution is an important topic of research in OCT. Thus, to improve resolution, the bandwidth of the source must be increased. Practical sources have finite bandwidth. Therefore, it is suggested to use more sources. Previous work expected that resolution will be inevitably improved without mentioning to what extent it will be improved and without any referencing to the effect of spectral separation between the sources. We study the resolution of a Fourier-domain OCT (FD-OCT) system based on two sources. First, we show to ...

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    4. Dispersion compensation in Fourier domain optical coherence tomography

      Dispersion compensation in Fourier domain optical coherence tomography

      In this work, we propose a numerical technique to compensate for errors due to dispersion effects in Fourier domain optical coherence tomography. The proposed technique corrects for errors in depth measurements and resolution loss due to dispersion. The results show that, by using this technique, errors in thickness measurement are reduced from about 5% to less than 0.1% depending on the sample length and the amount of dispersion. Also, an improvement in the resolution from about 50 μm to less than 10 μm is demonstrated.

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    1-4 of 4
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    1. (2 articles) Yale University
    2. (1 articles) Medical University of Vienna
    3. (1 articles) Thomas Jefferson University
    4. (1 articles) University of Southern California
    5. (1 articles) Duke University
    6. (1 articles) Sharon F. Freedman
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