Articles that mention University of Manitoba -Optical Coherence Tomography News

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2. Fast simulation of finite-beam optical coherence tomography of inhomogeneous turbid media (Thesis)
  
  Explore MSpace Home Nov 1 2018 Student Theses
  
  We developed a fast simulator of finite-beam optical coherence tomography (OCT) of inhomogeneous turbid media. Our Sequential Monte Carlo (MC) based finite beam OCT simulator can reach more than a hundred times faster than one that represents a finite OCTs incident beam as a superposition of infinitely thin beams, i.e., a superposition-based MC simulator. In this thesis, first, we highlight the lesser-known correspondence between the commonly used MC simulation ...
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  Mentions: University of Manitoba
3. Scaled nonuniform Fourier transform for image reconstruction in swept source optical coherence tomography
  
  Explore SPIE Digital Library Feb 27 2018
  
  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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  Mentions: Sherif S. Sherif University of Manitoba
4. Design and Implementation of Full Field-Optical Coherence Tomography on an Olympus IX73 Microscope (Thesis)
  
  Explore MSpace Home Oct 18 2017 Student Theses
  
  Optical Coherence Tomography (OCT) has established itself as an important imaging technology for biomedical and industrial applications. In this thesis, we describe the design and implementation of a novel Full-Field OCT optical module that is specifically designed to fit inside an Olympus IX73 inverted microscope. We describe the design, components, and implementation of this novel optical module in detail. The resulting FF-OCT setup (microscope and OCT optical module) can be ...
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  Mentions: University of Manitoba Olympus
5. Massively parallel simulator of optical coherence tomography of inhomogeneous turbid media
  
  Explore ScienceDirect Sep 2 2017
  
  Background and objective An accurate and practical simulator for Optical Coherence Tomography (OCT) could be an important tool to study the underlying physical phenomena in OCT such as multiple light scattering. Recently, many researchers have investigated simulation of OCT of turbid media, e.g., tissue, using Monte Carlo methods. The main drawback of these earlier simulators is the long computational time required to produce accurate results. We developed a massively ...
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  Mentions: University of Manitoba Ivan T. Lima North Dakota State University
6. Restoration of optical coherence tomography images using stochastic methods (Thesis)
  
  Explore MSpace Home Jan 22 2016 Student Theses
  
  Optical coherence tomography (OCT) is a rapidly growing imaging modality that produces high resolution three dimensional images that can be applied to different medical and industrial applications . Obtaining higher depth of imaging and higher imaging quality are important goals in OCT systems. One of the main factors that affects the penetration depth and imaging quality of OCT systems is the presence of noise. The depth-scan photocurrent of time domain (TD ...
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  Mentions: University of Manitoba
7. Detection of Atherosclerotic Plaque from Optical Coherence Tomography Images Using Texture-Based Segmentation
  
  Explore Журнал СТМ Apr 27 2015 Cardiology
  
  Detection of atherosclerotic plaque from optical coherence tomography (OCT) images by visual inspection is difficult. We developed a texture based segmentation method to identify atherosclerotic plaque automatically from OCT images without any reliance on visual inspection. Our method involves extraction of texture statistical features (spatial gray level dependence matrix method), application of an unsupervised clustering algorithm (K-means) on these features, and mapping of the clustered regions: background, plaque, vascular tissue ...
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  Mentions: Sherif S. Sherif Michael G. Sowa Mark D. Hewko
8. Spectral-Domain Optical Coherence Tomography in Hydroxychloroquine Retinopathy
  
  Explore Ophthalmology Dec 15 2014 Ophthalmology
  
  ...* Department of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada * Department of Ophthalmology, University of Manitoba, Winnipeg, Manitoba, Canada Correspondence * Correspondence: Janine L. Johnston, MD...
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9. Accelerated simulation of optical coherence tomography of objects with arbitrary spatial distributions
  
  Explore Conference Proceedings Oct 1 2014
  
  We developed a highly parallel simulator of Optical Coherence Tomography (OCT) of objects with arbitrary spatial distributions. This Monte Carlo method based simulator models the object as a tetrahedron-based mesh, and implements an advanced importance sampling scheme. This new method makes OCT simulations more practical, since the corresponding serial Central Processing Unit (CPU) based implementation requires approximately 360 hours to simulate OCT imaging of a single B-scan. We implemented this ...
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  Mentions: Sherif S. Sherif University of Manitoba Ivan T. Lima
10. Monte Carlo simulation of optical coherence tomography for turbid media with arbitrary spatial distributions
  
  Explore SPIE | Journal Apr 4 2014
  
  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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  Mentions: Sherif S. Sherif University of Manitoba Ivan T. Lima
11. Texture based segmentation method to detect atherosclerotic plaque from optical tomography images
  
  Explore Conference Proceedings Jun 23 2013 Cardiology
  
  Optical coherence tomography (OCT) imaging has been widely employed in assessing cardiovascular disease. Atherosclerosis is one of the major cause cardio vascular diseases. However visual detection of atherosclerotic plaque from OCT images is often limited and further complicated by high frame rates. We developed a texture based segmentation method to automatically detect plaque and non plaque regions from OCT images. To verify our results we compared them to photographs of ...
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  Mentions: Sherif S. Sherif Michael G. Sowa Mark D. Hewko
12. Maximization of signal-to-noise ratio in optical coherence tomography using a depth-dependent matched filter
  
  Explore Conference Proceedings Oct 30 2012
  
  We discuss and demonstrate the dependence of noise on the signal in time-domain optical coherence tomography (TDOCT). We then derive a depth-dependent matched filter to maximize the signal-to-noise ratio at every pixel in a depth scan (A-scan). We use an empirical estimate of the second order statistics of the noise in OCT images of vascular tissue to implement a depth-dependent filter that is matched to these images. The application of ...
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  Mentions: Sherif S. Sherif Michael G. Sowa National Research Council Canada
13. Detection of atherosclerotic vascular tissue from optical coherence tomography images
  
  Explore Conference Proceedings Oct 30 2012
  
  Atherosclerotic coronary artery disease continues to be one of the major causes of mortality. Prevention, diagnosis and treatment of atherosclerotic coronary artery disease are dependent on the detection of high risk atherosclerotic plaque. As age is one of the most important risk factors, atherosclerosis worsens steadily with increasing age. Automatic characterization of atherosclerotic plaque using the optical coherence tomography (OCT) images provides a powerful tool to classify patients with high ...
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  Mentions: Sherif S. Sherif Michael G. Sowa Mark D. Hewko
14. Fast calculation of multipath diffusive reflectance in optical coherence tomography
  
  Explore opticsinfobase.org Mar 12 2012
  
  We show how to efficiently calculate the signal in optical coherence tomography (OCT) systems due to the ballistic photons, the quasi-ballistic photons, and the photons that undergo multiple diffusive scattering using Monte Carlo simulations with importance sampling. This method enables the calculation of these three components of the OCT signal with less than one hundredth of the computational time required by the conventional Monte Carlo method. Therefore, it can be ...
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  Mentions: Sherif S. Sherif University of Manitoba Ivan T. Lima
15. Optical coherence tomography: fundamental principles, instrumental designs and biomedical applications
  
  Explore SpringerLink Home Aug 6 2011
  
  The advances made in the last two decades in interference technologies, optical instrumentation, catheter technology, optical detectors, speed of data acquisition and processing as well as light sources have facilitated the transformation of optical coherence tomography from an optical method used mainly in research laboratories into a valuable tool applied in various areas of medicine and health sciences. This review paper highlights the place occupied by optical coherence tomography in ...
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  Mentions: Shoude Chang Youxin Mao Sherif S. Sherif
16. Optical Coherence Tomography Used $500M of Federally Funded Research Over The Past Decade: How was it Used, What was Accomplished, and What’s to Come?
  
  Explore Optical Coherence Tomography News Jul 16 2011 Funding
  
  ... $743,746 Ontario Cancer Institute $458,447 École Polytechnique de Montréal $421,314 University of Manitoba $371,968 University of Victoria $248,025 Queen's University $212,130...
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  Mentions: Guillermo J. Tearney Joseph A. Izatt University of Pittsburgh
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