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In this paper two novel methods are proposed for recognizing B-mode ultrasound (US) imaging of common carotid artery (CCA) in longitude. In the single frame method, the US is segmented by k-means fuzzy clustering algorithm. Then a series points are extracted based on geometric features. Thirdly, the feature points are selected according to our new cluster method. Then curve fitting is applied by feature...
Carotid sonography can be used to assess the extent and severity of atherosclerosis in populations. The common carotid artery (CCA) properties, such as the lumen diameter and wall thickness, can be measured non-invasively. In real-time processing systems of ultrasound imaging, the manual initialization procedure interferes with the difficult task of the sonographer to select. In order to eliminate...
A method for simultaneous 3D imaging and analysis of microvascularization and bone microstructure in rat bone is presented. The method is based on the use of quantitative synchrotron micro-computed tomography (SR-??CT) coupled to an automatic image analysis procedure. Previously, analysis of bone microvascularization has generally been performed from 2D histology. The proposed method enables for the...
Investigating the effect of retinal oxygenation abnormalities in the development of common eye diseases requires accurate assessment of oxygen tension in retinal vasculatures. Estimation of oxygen tension in retinal capillaries using phosphorescence lifetime imaging is addressed in this paper. Separation from tissue and oxygen tension estimation is a more challenging task for capillaries when compared...
Procedural guidance using high-resolution, three-dimensional (3D) myocardial scar mapping may offer assistance in directing catheter ablation therapy aimed at eliminating re-entrant arrhythmic pathways. For the purpose of pre-procedural planning and intra-procedural guidance, determining the spatial relationship between myocardial scar, cardiac chambers and vascular structures is a crucial step towards...
Optical coherence tomography (OCT) is a rapidly emerging imaging modality that can provide non-invasive, cross-sectional, high-resolution images of tissue morphology in situ and in real-time. Previous studies have demonstrated that OCT can non-invasively visualize the pathological changes in the living kidney in real-time using the Munich-Wistar rat model. In this work, we demonstrate, for the first...
MR angiography of the abdominal artery has been often performed using contrast agents. Recent attention has focused on non-contrast MR techniques for evaluating the abdominal artery and cardio vascular, most notably Steady-State Free Precession (SSFP; also termed balanced FFE, true-FISP, and FIESTA). In this study an IR-prepared, segmented TrueFISP sequence has been introduced at 3T. Four volunteers...
This study focuses on detection of capillaries and small blood vessels in the videos recorded from the lingual surface using Microscan SDF system. The purpose of this study is to quantitatively monitor and assess the changes that occur in microcirculation during resuscitation period. The results assist physicians in making diagnostically and therapeutically important decisions such as determination...
The aim of this study was to validate cardiac output (CO) values obtained by fully automated segmentation of the left ventricle (LV) against CO measured from the volume flow in the pulmonary artery. Segmentation of the LV in 3D echographic images may substantially support clinical diagnosis of (congenital) heart disease. Assumptions about shape and appearance of the heart are often incorporated in...
Thermal imaging techniques have been applied to detect and measure mental stress in polygraph screening and other applications. Mental stress is highly correlated with the activation of the corrugator muscle on the forehead. The vessels that supply blood to the corrugator muscle, proportionally to its degree of activation, are the supraorbital vessels. The rate of blood flow in these vessels can be...
Contrast agents are used in ultrasound imaging to enhance blood region and thereby separate the perfused area and the surrounding tissues. But unfortunately the signals backscattered from agent and tissues are still close. So it is necessary to implement signal processing to enhance the contrast echo. In this article, we apply the autoregressive model to exploit the nonlinear behavior agent properties...
The research on digital visible human is of great significance and application value. The US Visible Human Project (VHP) created the first digital image data set of a complete human (one male and one female) in 1995. To promote a worldwide application-oriented VHR, more visible human data sets representative of different populations of the world are in demand. The Chinese Visible Human (CVH) male...
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