1. Evgenia Bousi

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    1. Mentioned In 14 Articles

    2. Using speckle to measure tissue dispersion in optical coherence tomography

      Using speckle to measure tissue dispersion in optical coherence tomography
      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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    3. Using speckle to measure tissue dispersion in optical coherence tomography

      Using speckle to measure tissue dispersion in optical coherence tomography
      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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    4. Lateral resolution improvement of oversampled OCT images using Capon estimation of weighted subvolume contribution

      Lateral resolution improvement of oversampled OCT images using Capon estimation of weighted subvolume contribution
      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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    5. Correlation of the derivative as a robust estimator of scatterer size in optical coherence tomography (OCT)

      Correlation of the derivative as a robust estimator of scatterer size in optical coherence tomography (OCT)
      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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    6. Lateral resolution improvement in Optical Coherence Tomography (OCT) images

      Lateral resolution improvement in Optical Coherence Tomography (OCT) images
      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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    7. University of Cyprus receives a grant of 163,780 Euro ($208,844) enhancing the resolution of Optical Coherence Tomography.

      University of Cyprus receives a grant of 163,780 Euro ($208,844) enhancing the resolution of Optical Coherence Tomography.
      ... 2012 and ending in Aug. 2014. The principle investigator is Prof. Costas Pitris with post-doctoral associate Evgenia Bousi. A brief description of the project is given below. The main objective of this project is to de...
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    8. Axial resolution improvement by modulated deconvolution in Fourier domain optical coherence tomography

      Axial resolution improvement by modulated deconvolution in Fourier domain optical coherence tomography
      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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    9. Lateral resolution improvement in oversampled Optical Coherence Tomography images assuming weighted oversampled multi-scatterer contributions

      Lateral resolution improvement in oversampled Optical Coherence Tomography images assuming weighted oversampled multi-scatterer contributions
      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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    10. AM-FM techniques in the analysis of optical coherence tomography signals

      The subtle tissue changes associated with the early stages of malignancies, such as cancer, are not clearly discernible even at the current, improved, resolution of optical coherence tomography (OCT) systems. However, these changes directly affect the spectral content of the OCT image that contains information regarding these unresolvable features. Spectral analysis of OCT signals has recently been shown to provide additional information, resulting in improved contrast, directly related to scatterer ...
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    11. 1-14 of 14
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  2. About Evgenia Bousi

    Evgenia Bousi

    Evgenia Bousi (Diploma (BSc/MSc) in Electrical and Computer Engineering from the National Technical University of Athens, 2004) is a researcher and PhD candidate in the Dept. of Electrical and Computer Engineering at the University of Cyprus. From 2004 to 2005 she was a software engineer at the software centre of Siemens, Greece. From 2005 to 2007 she was a research assistant at the Biomedical Imaging and Applied Optics Laboratory, University of Cyprus. In September of 2006 she was accepted as a Ph.D. candidate in the Department of Electrical and Computer Engineering at the University of Cyprus. The subject of her PhD research is the development of novel technologies for Optical Coherence Tomography. Her research interests include Optical Coherence Tomography, Biomedical Optics, Optical Imaging, Signal and Image processing and new technologies in clinical applications for the improvement of the diagnosis and treatment. She is involved in various projects funded by the University of Cyprus and the Research Promotion Foundation of Cyprus She is a member of the IEEE, and the Technical Chamber of Cyprus (ETEK) and Greece (TEE).