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Cardiovascular diseases are one of the main causes of mortality in the world. For this reason it is important to develop techniques that allow for better understanding of cardiac remodelling prior to heart failure. In this line, Second Harmonic Imaging (SHI) provides a label-free microscopy approach to image cardiac fibers. In this work, we automated means for measuring average sarcomere length, intrasarcomeric...
New techniques to enable the prediction of a reliable brain death index (BDI) measures are needed to improve patient care in the intensive care unit (ICU). The utilization of robust indicators combined with improved methods of data analysis and modeling is likely to deliver this facility. Like many forms of indicators, a combination of different measurement types can always improve the assessment...
Catheter-based epicardial mapping is possible with two access methods: transthoracic access and transvenous access. Transthoracic access requires lengthy sequential mapping procedures and stable arrhythmias. Transvenous access uses the multielectrode (4-to-20 electrodes) catheters placed in the coronary veins, however, leaves most of the epicardium inaccessible to direct measurement. The aim of this...
In the present paper, we propose a new pulse measurement methodology based on thermal imaging (contact-free). The method capitalizes both on the thermal undulation produced by the traveling pulse as well as the periodic expansion of the compliant vessel wall. The paper reports experiments on 34 subjects, where it compares the performance of the new pulse measurement method to the one we reported previously...
Catheter-based epicardial mapping is possible with two access methods: transthoracic access and transvenous access. Transthoracic access requires lengthy sequential mapping procedures and stable arrhythmias. Transvenous access uses the multielectrode (4-to-20 electrodes) catheters placed in the coronary veins, however, leaves most of the epicardium inaccessible to direct measurement. The aim of this...
In the present paper, we propose a new pulse measurement methodology based on thermal imaging (contact-free). The method capitalizes both on the thermal undulation produced by the traveling pulse as well as the periodic expansion of the compliant vessel wall. The paper reports experiments on 34 subjects, where it compares the performance of the new pulse measurement method to the one we reported previously...
Catheter-based electrophysiological studies of the outer surface of the heart (epicardium) are limited to regions near the heart vessels or require transthoracic access. We have developed a statistical signal processing approach by which to estimate high-resolution epicardial activation maps from multi-electrode venous catheter measurements. This technique uses a linear minimum mean-squared Bayesian...
Catheter-based electrophysiological studies of the outer surface of the heart (epicardium) are limited to regions near the heart vessels or require transthoracic access. We have developed a statistical signal processing approach by which to estimate high-resolution epicardial activation maps from multi-electrode venous catheter measurements. This technique uses a linear minimum mean-squared Bayesian...
Right ventricular (RV) volume quantification from cardiac magnetic resonance imaging is based on manual tracing of endocardial boundaries and application of geometric modeling. This procedure is subjective, time-consuming and may bias volume measurements since the right ventricle is a complex structure that is not well suited to a geometric model. We developed a technique for RV endocardial surface...
The sequences technique is the most used time domain technique for the assessment of arterial baroreceptor reflex sensitivity (BRS) and is based in the analysis of the beat-to-beat spontaneous variability of systolic blood pressure and heart period. Although a common used method, the sequences technique imposes the setting of several parameters to determine what is a valid baroreflex event and no...
We have developed a new technique, which may enable a more accurate, complete characterization of the circulatory system, including local or global hydrodynamic phenomena, using multiple measurements from several anatomic locations and/or multiple modalities. This technique, Laguerre model blind system identification (LMBSI), uses a Laguerre function series expansion to provide a compact but complete...
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