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Chritos P. Loizou
89Publications
18H-index
1,271Citations
Publications 89
Newest
Published on Jan 1, 2019
Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Efthivoulos Kyriacou1
Estimated H-index: 1
(Frederick University)
High-resolution vascular B-mode and Doppler ultrasound provide information not only on the degree of carotid artery stenosis but also on the characteristics of the arterial wall including the size and consistency of atherosclerotic plaques [1]. Carotid stenosis alone has limitations in predicting risk and does not show plaque vulnerability and instability, thus other ultrasonographic plaque morphologic characteristics have been studied for better prediction of the risk stroke. Plaque echogenicit...
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Published on Jan 31, 2018
Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Constantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
Border identification of the atherosclerotic carotid plaque, the common carotid artery (CCA), degree of stenosis, as well as the characteristics of the arterial wall (plaque size, composition and elasticity), may add additional clinical information for the assessment of future cardiovascular events. We propose and evaluate in this chapter an integrated system for the segmentation of atherosclerotic carotid plaque in ultrasound videos of the CCA. The system is based on video frame normalization, ...
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Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Dimitrios Matamis15
Estimated H-index: 15
+ 5 AuthorsConstantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
Measurements of ultrasound diaphragmatic motion, amplitude, force, and velocity of contraction may provide important and essential information about diaphragmatic fatigue, weakness, or paralysis. In this paper, we propose and evaluate a semi-automated analysis system for measuring the diaphragmatic motion and estimating the maximum relaxation rate (MRR_SAUS) from ultrasound M-mode images of the diaphragmatic muscle. The system was evaluated on 27 M-mode ultrasound images of the diaphragmatic mus...
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Published on Jun 1, 2017 in Computer-Based Medical Systems
Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Christos Papacharalambous + 5 AuthorsConstantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
During a human brain MRI acquisition the resulting image is formed out of 2D slices. The slices must then be aligned and reconstructed to provide a 3-dimensional (3D) visualization of the brain volume. We propose in this work, an integrated system for the register ion and 3D reconstruction of DICOM MRI images and lesions of the brain acquired from multiple sclerosis (MS) subjects at two different time intervals (time 0 (T0) and time 1 (T1)). The system facilitates the follow up of the MS disease...
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Published on Jun 1, 2017 in Computer-Based Medical Systems
Efthyvoulos Kyriacou19
Estimated H-index: 19
(Frederick University),
Ανδρέας Ν. Νικολαΐδης76
Estimated H-index: 76
(Center for Drug Evaluation and Research)
+ 5 AuthorsConstantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
Through this study we are presenting the initial steps towards a real time motion analysis system to predict the stability of carotid bifurcation plaques. The analysis is performed on B-mode video loops. Loops are analyzed in order to follow systole and diastole sections of the cardiac cycle and trace the motion of plaques during these periods. We had created a system that applies Farnebacks optical flow estimation method in order to estimate the flow between consecutive frames or frames at a pr...
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Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Constantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
+ 2 AuthorsΑνδρέας Ν. Νικολαΐδης76
Estimated H-index: 76
The objective of this paper was to investigate texture feature variability in ultrasound video of the carotid artery during the cardiac cycle in an attempt to define new discriminatory biomarkers of the vulnerable plaque. More specifically, in this paper, 120 longitudinal ultrasound videos, acquired from 40 normal (N) subjects from the common carotid artery and 40 asymptomatic (A) and 40 symptomatic (S) subjects from the proximal internal carotid artery were investigated. The videos were intensi...
2 Citations Source Cite
Published on Jan 1, 2016
Christakis D. Loizou2
Estimated H-index: 2
(Cyprus University of Technology),
Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology)
+ 3 AuthorsConstantinos S. Pattichis34
Estimated H-index: 34
(University of Cyprus)
Measurements of ultrasound diaphragmatic motion may provide important and essential information about diaphragmatic fatigue. In this work, we propose a semi-automated analysis system for measuring the diaphragmatic motion and estimation of the maximum relaxation rate (MRR) from ultrasound M-mode images of the diaphragmatic muscle. The proposed system was evaluated in three ultrasound images of the diaphragmatic muscle. The system is able to compute the diaphragmatic motion and extract quantitati...
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Published on Jan 1, 2016
George Michael1
Estimated H-index: 1
(Cyprus University of Technology),
Kyriakos Tsaparellas1
Estimated H-index: 1
(Cyprus University of Technology)
+ 2 AuthorsAndreas Lanitis22
Estimated H-index: 22
(Cyprus University of Technology)
Patient monitoring is an important operation taking place in hospitals. It usually involves the use of dedicated invasive equipment that requires the co-operation of patients and also involves remarkable purchase and maintenance costs. In this paper we describe a feasibility study of using image analysis techniques for implementing a low-cost non-invasive patient monitoring system based on iris tracking and pain detection in image sequences captured with ordinary video cameras. Within this conte...
1 Citations Source Cite
Published on Jan 1, 2016
Rafaella Solomou1
Estimated H-index: 1
(Cyprus University of Technology),
Chritos P. Loizou18
Estimated H-index: 18
(Cyprus University of Technology),
Takis Kasparis18
Estimated H-index: 18
(Cyprus University of Technology)
The carotid artery wall motion characteristics from ultrasound videos may provide useful information regarding healthy, asymptomatic or symptomatic subjects as well as aid in the development and validation of motion analysis algorithms. This still remains a challenging task, as actual motion characteristics and indices are not directly available. In the present work we propose a methodology for generating simulated common carotid artery (CCA) ultrasound videos, which consists of the following st...
1 Citations Source Cite
Chritos P. Loizou18
Estimated H-index: 18
,
Constantinos S. Pattichis34
Estimated H-index: 34
Abstract In ultrasound imaging and video visual perception is hindered by speckle multiplicative noise that degrades the quality. Noise reduction is therefore essential for improving the visual observation quality or as a pre-processing step for further automated analysis, such as image/video segmentation, texture analysis and encoding in ultrasound imaging and video. The goal of the first book (book 1 of 2 books) was to introduce the problem of speckle in ultrasound image and video as well as t...
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