Articles that mention University of Cyprus -Optical Coherence Tomography News

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2. Dual-angle optical coherence tomography for index of refraction estimation using rigid registration and cross-correlation
  
  Explore SPIE Digital Library Oct 9 2019
  
  $Dual-angle optical coherence tomography for index of refraction estimation using rigid registration and cross-correlation$
  The index of refraction ( n ) of materials and/or tissues depends on their physical properties and serves as a source of optical contrast in imaging. The variations of the index of refraction have also been investigated for diagnostic purposes in various fields, such as hematology, oncology, etc., since they can signify disease and cell dynamic changes. Optical coherence tomography (OCT) has been used in the past to measure the index ...
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  Mentions: University of Cyprus
3. Comparison of tissue dispersion measurement techniques based on optical coherence tomography
  
  Explore SPIE Digital Library Apr 30 2019
  
  The effects of dispersion on optical coherence tomography (OCT) images have long been documented. The imbalance of spectral broadening, caused by dispersion mismatches in the two arms of the OCT interferometer, can result in significant resolution degradation. Efforts to correct this phenomenon have resulted in improved image quality using various techniques. However, dispersion is also present and varies in tissues. As a result, group velocity dispersion (GVD) can be used ...
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  Mentions: University of Cyprus
4. Automated detection of esophageal dysplasia in in vivo optical coherence tomography images of the human esophagus
  
  Explore SPIE Digital Library Feb 27 2018 Gastroenterology
  
  Catheter-based Optical Coherence Tomography (OCT) devices allow real-time and comprehensive imaging of the human esophagus. Hence, they provide the potential to overcome some of the limitations of endoscopy and biopsy, allowing earlier diagnosis and better prognosis for esophageal adenocarcinoma patients. However, the large number of images produced during every scan makes manual evaluation of the data exceedingly difficult. In this study, we propose a fully automated tissue characterization algorithm, capable ...
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  Mentions: Massachusetts General Hospital Harvard University University of Cyprus
5. Using speckle to measure tissue dispersion in optical coherence tomography
  
  Explore OSA | OSA Publishing Apr 17 2017
  
  Tissue dispersion could be used as a marker of early disease changes to further improve the diagnostic potential of optical coherence tomography (OCT). However, most methods to measure dispersion, described in the literature, rely on the presence of distinct and strong reflectors and are, therefore, rarely applicable in vivo . A novel technique has been developed which estimates the dispersion-induced resolution degradation from the image speckle and, as such, is applicable ...
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6. Tissue dispersion measurement techniques using optical coherence tomography
  
  Explore Conference Proceedings Mar 1 2017
  
  Dispersion, a result of wavelength-dependent index of refraction variations, causes pulse-width broadening with detrimental effects in many pulsed-laser applications. It is also considered to be one of the major causes of resolution degradation in Optical Coherence Tomography (OCT). However, dispersion is material dependent and, in tissue, Group Velocity Dispersion (GVD) could be used, for example, to detect changes associated with early cancer and result in more accurate disease diagnosis. In ...
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7. Using speckle to measure tissue dispersion in optical coherence tomography
  
  Explore Conference Proceedings Mar 1 2017
  
  In Optical Coherence tomography (OCT), dispersion mismatches cause degradation of the image resolution. However, dispersion is specific to the material that is causing the effect and can therefore carry useful information regarding the composition of the samples. In this summary, we propose a novel technique for estimating the dispersion in tissue which uses the image speckle to calculate the PSF degradation and is therefore applicable to any tissue and can ...
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  Mentions: University of Cyprus
8. Lateral resolution improvement of oversampled OCT images using Capon estimation of weighted subvolume contribution
  
  Explore OSA | OSA Publishing Feb 22 2017
  
  A novel technique for lateral resolution improvement in optical coherence tomography (OCT) is presented. The proposed method is based on lateral oversampling of the image. The locations and weights of multiple high spatial resolution sub-volumes are calculated using a Capon estimator assuming each contributes a weighted portion to the detected signal. This technique is independent of the delivery optics and the depth of field. Experimental results demonstrate that it is ...
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  Mentions: University of Cyprus
9. Correlation of the derivative as a robust estimator of scatterer size in optical coherence tomography (OCT)
  
  Explore OSA | OSA Publishing Feb 22 2017
  
  The size-dependent spectral variations, predicted by Mie theory, have already been considered as a contrast enhancement mechanism in optical coherence tomography. In this work, a new spectroscopic metric, the bandwidth of the correlation of the derivative, was developed for estimating scatterer size which is more robust and accurate compared to existing methods. Its feasibility was demonstrated using phantoms containing polystyrene microspheres as well as images of normal and cancerous human ...
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10. Development of a new, robust and accurate, spectroscopic metric for scatterer size estimation in optical coherence tomography (OCT) images
  
  Explore Conference Proceedings Mar 15 2016
  
  The modulations appearing on the backscattering spectrum originating from a scatterer are related to its diameter as described by Mie theory for spherical particles. Many metrics for Spectroscopic Optical Coherence Tomography (SOCT) take advantage of this observation in order to enhance the contrast of Optical Coherence Tomography (OCT) images. However, none of these metrics has achieved high accuracy when calculating the scatterer size. In this work, Mie theory was used ...
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11. Estimation of weighted multi-scatterer contributions for improvement of lateral resolution of optical coherence tomography images
  
  Explore Conference Proceedings Jun 25 2013
  
  A method for improvement of lateral resolution in Optical Coherence Tomography (OCT) is presented. The resolution improvement achieved with this method does not depend on the delivery optics. Moreover the depth of focus is not restricted. The method is based on the lateral oversampling of the image. The laterally oversampled signals are backscattered signals from shifted and overlapped resolution volumes. Signals from successive volumes are correlated due to the region ...
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12. Lateral resolution improvement in Optical Coherence Tomography (OCT) images
  
  Explore IEEE Xplore Jan 8 2013
  
  A novel method for lateral resolution improvement of Optical Coherence Tomography (OCT) images, which is independent of the focusing of the delivery optics and the depth of field, is presented. This method was inspired by radar range oversampling techniques. It is based on the lateral oversampling of the image and the estimation of the locations of the multiple scatterers which contribute to the signal. The information in the oversampled images ...
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  Mentions: University of Cyprus
13. University of Cyprus receives a grant of 163,780 Euro ($208,844) enhancing the resolution of Optical Coherence Tomography.
  
  Explore Optical Coherence Tomography News Nov 21 2012 Funding
  
  ...The proposed research will be performed in the Biomedical Imaging and Applied Optics (BIAO) Laboratory of the University of Cyprus. The partners are the National Technical University of Athens (NTUA) through the Institut...
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14. Axial resolution improvement by modulated deconvolution in Fourier domain optical coherence tomography
  
  Explore Linking to Scitation Content May 15 2012 Ophthalmology
  
  A novel technique for axial resolution improvement in Fourier domain optical coherence tomography (FDOCT) is presented. The technique is based on the deconvolution of modulated optical coherence tomography signals. In FDOCT, the real part of the Fourier transform of the interferogram is modulated by a frequency which depends on the position of the interferogram in k space. A slight numerical k shift results in a different modulation frequency. By adding ...
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15. Lateral resolution improvement in oversampled Optical Coherence Tomography images assuming weighted oversampled multi-scatterer contributions
  
  Explore Linking to Scitation Content Feb 9 2012
  
  A novel method for lateral resolution improvement of Optical Coherence Tomography (OCT) images, which is independent of the focusing of the delivery optics and the depth of field, is presented. This method was inspired by radar range oversampling techniques. It is based on the lateral oversampling of the image and the estimation of the locations of the multiple scatterers which contribute to the signal. The information in the oversampled images ...
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  Mentions: University of Cyprus
16. Handbook of Biomedical Optics (Book)
  
  Explore CRC Press Online Jun 14 2011 Textbooks
  
  Biomedical optics holds tremendous promise to deliver effective, safe, non- or minimally invasive diagnostics and targeted, customizable therapeutics. Handbook of Biomedical Optics provides an in-depth treatment of the field, including coverage of applications for biomedical research, diagnosis, and therapy. It introduces the theory and fundamentals of each subject, ensuring accessibility to a wide multidisciplinary readership. It also offers a view of the state of the art and discusses advantages and ...
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  Mentions: Duke University Harvard University University of Cyprus
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