Browsing by Subject "Ultrasonics"

Now showing items 1-20 of 46

    • Conference Object  

      AM-FM representations for the characterization of carotid plaque ultrasound Images 

      Christodoulou, Christodoulos I.; Pattichis, Constantinos S.; Murray, V.; Pattichis, Marios S.; Nicolaïdes, Andrew N. (2008)
      Stroke is the third leading cause of death in the western world and a major cause of disability in adults. The objective of this work was to investigate the use of AM-FM representations for the characterization of carotid ...
    • Article  

      Assessment of stroke risk based on morphological ultrasound image analysis with conformal prediction 

      Lambrou, Alexandra; Papadopoulos, Harris; Kyriacou, Efthyvoulos C.; Pattichis, Constantinos S.; Pattichis, Marios S.; Gammerman, A.; Nicolaïdes, Andrew N. (2010)
      Non-invasive ultrasound imaging of carotid plaques allows for the development of plaque image analysis in order to assess the risk of stroke. In our work, we provide reliable confidence measures for the assessment of stroke ...
    • Conference Object  

      Atherosclerotic carotid plaque texture variability in ultrasound video 

      Loizou, Christos P.; Pantzaris, Marios C.; Nicolaïdes, Andrew N.; Pattichis, Constantinos S. (Springer Verlag, 2015)
      Ultrasound video of the common carotid artery (CCA) combined with texture feature analysis has the potential in differentiating between asymptomatic and symptomatic atherosclerotic carotid plaque and is used widely for the ...
    • Conference Object  

      Atherosclerotic carotid wall segmentation in ultrasound images using Markov random fields 

      Petroudi, Styliani; Loizou, Christos P.; Pattichis, Constantinos S. (2010)
      This work explores the segmentation of the intima-media complex (IMC) of the common carotid artery (CCA) wall for the evaluation of the intima media thickness (IMT) on B-mode ultrasound images. The IMT provides important ...
    • Conference Object  

      Atherosclerotic plaque motion analysis from ultrasound videos 

      Murillo, S. E.; Pattichis, Marios S.; Loizou, Christos P.; Pattichis, Constantinos S.; Kyriacou, Efthyvoulos C.; Constantinides, Anthony G.; Nicolaïdes, Andrew N. (2006)
      In this paper, we describe a collection of algorithms that are used to provide motion trajectory estimates from atherosclerotic plaque ultrasound videos. Our approach is based on the use of four different optical flow ...
    • Article  

      Atherosclerotic plaque ultrasound video encoding, wireless transmission, and quality assessment using H.264 

      Panayides, Andreas S.; Pattichis, Marios S.; Pattichis, Constantinos S.; Loizou, Christos P.; Pantzaris, Marios C.; Pitsillides, Andreas (2011)
      We propose a unifying framework for efficient encoding, transmission, and quality assessment of atherosclerotic plaque ultrasound video. The approach is based on a spatially varying encoding scheme, where video-slice ...
    • Article  

      Classification of atherosclerotic carotid plaques using morphological analysis on ultrasound images 

      Kyriacou, Efthyvoulos C.; Pattichis, Marios S.; Pattichis, Constantinos S.; Mavrommatis, A.; Christodoulou, Christodoulos I.; Kakkos, Stavros K.; Nicolaïdes, Andrew N. (2009)
      The aim of this study was to investigate the usefulness of multilevel binary and gray scale morphological analysis in the assessment of atherosclerotic carotid plaques. Ultrasound images were recorded from 137 asymptomatic ...
    • Article  

      Despeckle filtering for multiscale amplitude-modulation frequency-modulation (AM-FM) texture analysis of ultrasound images of the intima-media complex 

      Loizou, Christos P.; Murray, V.; Pattichis, Marios S.; Pantzaris, Marios C.; Nicolaïdes, Andrew N.; Pattichis, Constantinos S. (2014)
      The intima-media thickness (IMT) of the common carotid artery (CCA) is widely used as an early indicator of cardiovascular disease (CVD). Typically, the IMT grows with age and this is used as a sign of increased risk of ...
    • Conference Object  

      Despeckle filtering in ultrasound video of the common carotid artery 

      Loizou, Christos P.; Kasparis, Takis; Christodoulides, Paul; Theofanous, Charoula; Pantzaris, Marios C.; Kyriacou, Efthyvoulos C.; Pattichis, Constantinos S. (2012)
      Noise reduction is essential for increasing the visual quality or as a preprocessing step for further automated analysis in video sequences and video coding. The objective of this work was to investigate four different ...
    • Article  

      An effective ultrasound video communication system using despeckle filtering and HEVC 

      Panayides, Andreas S.; Pattichis, Marios S.; Loizou, Christos P.; Pantzaris, Marios C.; Constantinides, Anthony G.; Pattichis, Constantinos S. (2015)
      The recent emergence of the high-efficiency video coding (HEVC) standard promises to deliver significant bitrate savings over current and prior video compression standards, while also supporting higher resolutions that can ...
    • Article  

      Evaluation of the risk of stroke with confidence predictions based on ultrasound carotid image analysis 

      Lambrou, Alexandra; Papadopoulos, Harris; Kyriacou, Efthyvoulos C.; Pattichis, Constantinos S.; Pattichis, Marios S.; Gammerman, A.; Nicolaïdes, Andrew N. (2012)
      Conformal Predictors (CPs) are Machine Learning algorithms that can provide reliable confidence measures to their predictions. In this work, we make use of the Conformal Prediction framework for the assessment of stroke ...
    • Conference Object  

      A fully automated method using active contours for the evaluation of the intima-media thickness in carotid US images 

      Petroudi, Styliani; Loizou, Christos P.; Pantzaris, Marios C.; Pattichis, Marios S.; Pattichis, Constantinos S. (2011)
      The thickness of the intima-media complex (IMC) of the common carotid artery (CCA) wall is important in the evaluation of the risk for the development of atherosclerosis. This paper presents a fully automated algorithm for ...
    • Conference Object  

      Global optimization for motion estimation with applications to ultrasound videos of carotid artery plaques 

      Murillo, S.; Pattichis, Marios S.; Soliz, P.; Barriga, S.; Loizou, Christos P.; Pattichis, Constantinos S. (2010)
      Motion estimation from digital video is an ill-posed problem that requires a regularization approach. Regularization introduces a smoothness constraint that can reduce the resolution of the velocity estimates. The problem ...
    • Conference Object  

      HEVC encoding for reproducible medical ultrasound video diagnosis 

      Panayides, Andreas S.; Pattichis, Marios S.; Pattichis, Constantinos S. (IEEE Computer Society, 2013)
      In this study, we investigate how the recently introduced high efficiency video coding (HEVC) standard can be used in the design of reproducible medical ultrasound video diagnosis systems. We introduce a set of clinical ...
    • Conference Object  

      High efficiency video coding for ultrasound video communication in m-health systems 

      Panayides, Andreas S.; Antoniou, Zinonas C.; Pattichis, Marios S.; Pattichis, Constantinos S.; Constantinides, Anthony G. (2012)
      Emerging high efficiency video compression methods and wider availability of wireless network infrastructure will significantly advance existing m-health applications. For medical video communications, the emerging video ...
    • Article  

      High-resolution, low-delay, and error-resilient medical ultrasound video communication using H.264/AVC over mobile WiMAX networks 

      Panayides, Andreas S.; Antoniou, Zinonas C.; Mylonas, Yiannos; Pattichis, Marios S.; Pitsillides, Andreas; Pattichis, Constantinos S. (2013)
      In this study, we describe an effective video communication framework for the wireless transmission of H.264/AVC medical ultrasound video over mobile WiMAX networks. Medical ultrasound video is encoded using diagnostically ...
    • Article  

      An integrated system for the segmentation of atherosclerotic carotid plaque ultrasound video 

      Loizou, Christos P.; Petroudi, Styliani; Pantzaris, Marios C.; Nicolaïdes, Andrew N.; Pattichis, Constantinos S. (2014)
      The robust border identification of atherosclerotic carotid plaque, the corresponding degree of stenosis of the common carotid artery (CCA), and also the characteristics of the arterial wall, including plaque size, ...
    • Conference Object  

      M-mode state based identification in ultrasound videos of the atherosclerotic carotid plaque 

      Loizou, Christos P.; Pantzaris, Marios C.; Pattichis, Constantinos S.; Kyriacou, Efthyvoulos C. (2010)
      Monitoring the wall and plaque changes in the carotid artery (CA) can provide useful information for the assessment of the atherosclerotic disease. Using a motion mode (M-mode) image, detailed information may be obtained ...
    • Article  

      Manual and automated media and intima thickness measurements of the common carotid artery 

      Loizou, Christos P.; Pattichis, Constantinos S.; Nicolaïdes, Andrew N.; Pantzaris, Marios C. (2009)
      The intima-media thickness (IMT) of the common carotid artery (CCA) is widely used as an early indicator of the development of cardiovascular disease (CVD). It was proposed but not thoroughly investigated that the media ...
    • Conference Object  

      Measurement of motion of carotid bifurcation plaques 

      Nasrabadi, H.; Pattichis, Marios S.; Nicolaïdes, Andrew N.; Griffin, Maura B.; Makris, Gregory C.; Fisher, P.; Kyriacou, Efthyvoulos C.; Pattichis, Constantinos S. (2012)
      Video loops of B-mode ultrasound images of 35 carotid bifurcation plaques were obtained (4 symptomatic and 31 asymptomatic) from patients with carotid bifurcation atherosclerosis. Video loops were classified visually as ...