1. Sherif S. Sherif

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    1. Mentioned In 21 Articles

    2. Scaled nonuniform Fourier transform for image reconstruction in swept source optical coherence tomography

      Scaled nonuniform Fourier transform for image reconstruction in swept source optical coherence tomography
      Swept Source optical coherence tomography (SS-OCT) is an important imaging modality for both medical and industrial diagnostic applications. A cross-sectional SS-OCT image is obtained by applying an inverse discrete Fourier transform (DFT) to axial interferograms measured in the frequency domain (k-space). This inverse DFT is typically implemented as a fast Fourier transform (FFT) that requires the data samples to be equidistant in k-space. As the frequency of light produced by ...
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    3. Monte Carlo simulation of optical coherence tomography for turbid media with arbitrary spatial distributions

      Monte Carlo simulation of optical coherence tomography for turbid media with arbitrary spatial distributions
      We developed a Monte Carlo-based simulator of optical coherence tomography (OCT) imaging for turbid media with arbitrary spatial distributions. This simulator allows computation of both Class I diffusive reflectance due to ballistic and quasiballistic scattered photons and Class II diffusive reflectance due to multiple scattered photons. It was implemented using a tetrahedron-based mesh and importance sampling to significantly reduce computational time. Our simulation results were verified by comparing them with ...
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    4. Feature Of The Week 5/8/11: Using "Importance Sampling" to Speed Up Monte Carlo Simulations for Studying the Physical Processes Governing OCT Signals

      Feature Of The Week 5/8/11: Using "Importance Sampling" to Speed Up Monte Carlo Simulations for Studying the Physical Processes Governing OCT Signals
      Feature Of The Week 5/8/11: Numerical simulation has always played an important role in science and engineering to study complex stochastic phenomenon where purely analytical techniques are not sufficient. In many instances the computational burden from complex simulations can slow the progress of the fastest desktop computers to a snail’s pace. This can be particularly true in simulating the ballistic and quasi-ballistic components of light scattered in ...
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    5. Signal processing with unequally spaced data in Fourier-domain optical coherence tomography

      Signal processing with unequally spaced data in Fourier-domain optical coherence tomography
      Different algorithms for performing Fourier transforms with unequally sampled data in wavenumber space for Fourier-domain optical coherence tomography are considered. The efficiency of these algorithms is evaluated from point-spread functions obtained with a swept-source optical coherence tomography system and from computational time. Images of a 4-layer phantom processed with these different algorithms are compared. We show that convolving the data with an optimized Kaiser-Bessel window allowing a small oversampling factor ...
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    6. Interferometric system for complex image extraction

      The invention provides an interferometric system and method for quadrature detection of optical characteristics of a sample. The system includes a Mach-Zehnder interferometer providing a variable optical delay between light collected from the sample and reference light. The Mach-Zehnder interferometer has an output M.times.N coupler with N.gtoreq.3 output ports. Two differential detectors, each having two input ports coupled to a different two of the N output ...
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  2. About Sherif S. Sherif

    Sherif S. Sherif

    Sherif Sherif is an Associate Professor at the University of Manitoba and was formerly a researcher at Institute for Microstructural Sciences at the National Research Council of Canada.