Cardiac cycle
Semi-automatic algorithm for construction of the left ventricular area variation curve over a complete cardiac cycle
... Before watershed segmentation, it is necessary to create a barrier between the left atrium and the left ventricle, over the entire extension of the mitral valve, as illustrated in Figure 4(a). Such barrier is necessary ...
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Use of Dramatization to Teach Cardiac Cycle Physiology to Medical Students
... Both groups also performed equally well on the first posttest, even though students in Group A had experienced only dramatization and students in Group B experienced two methods of teaching (lecture and dramatization). ...
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Impact of flow rates in a cardiac cycle on correlations between advanced human carotid plaque progression and mechanical flow shear stress and plaque wall stress
... was negative using follow-up data and positive using baseline data. Flow rate had almost no impact on correlations between PWS and WTI. The study using baseline FSS data for possible correlation between advanced carotid ...
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Efficient and reproducible high resolution spiral myocardial phase velocity mapping of the entire cardiac cycle
... per cardiac cycle are not sufficient to deal with respiratory motion for prospectively gated PVM of the myocardium ...prospective cardiac gating this means that no velocity information is available ...
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Feedback from the heart: emotional learning and memory is controlled by cardiac cycle, interoceptive accuracy and personality
... the cardiac cycle during the time of rating. Cardiac timing was only used during the trial-and-error learning task to synchronise auditory feedback to participants’ ...and cardiac-invoked ...
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Quantification of myocardial blood flow with cardiovascular magnetic resonance throughout the cardiac cycle
... the cardiac cycle in humans and determine the overall trend between 5 selected time ...the cardiac cycle than in our ...to cardiac and re- spiratory motion ...
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Variation of lateral ventricular volume during the cardiac cycle observed by MR imaging
... We propose the model that arterial blood flow to the choroid plexuses results in expansion of the choroid plexuses with lateral and third ventricular volume expansion, but not fourth ven[r] ...
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2.2 The Cardiac Cycle
... • During diastole, as the whole heart relaxes, the a/v valves are open and blood can flow from the atria into the ventricles.... • Atrial Pressure - the major bump in the black curve [r] ...
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5.1 The Cardiac Cycle
... • The high pressure blood in the arteries would flow back into the ventricles, but the semi-lunar valves prevent this by snapping shut.. • During diastole, as the whole heart relaxes, [r] ...
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The Physiology of the Alligator Heart: the Cardiac Cycle
... Left ventricular output The pressure and flow relationships between the left ventricle and its output vessels, the right aorta and the carotid and subclavian arteries, were of a conventi[r] ...
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<p>Assessment of a Non Invasive Brain Oximeter in Volunteers Undergoing Acute Hypoxia</p>
... suggest that the brain PPG re fl ected changes of blood volume in the venous circulation. This is consistent with the known large percentage of cerebral blood in the venous circulation. Proportionally the venular beds ...
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Changes in blood flow velocity and diameter of the middle cerebral artery during hyperventilation: assessment with MR and transcranial Doppler sonography
... Studies revealing an intimate relationship between changes in mean blood flow velocity Vmax the time-averaged mean over the cardiac cycle of the spectral outline in the middle cerebral a[r] ...
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Finite-element-method (FEM) model generation of time-resolved 3D echocardiographic geometry data for mitral-valve volumetry
... data sets. 3D Slicer also runs on standard personal compu- ter operating systems such as Linux and OS X. The first landmark for the region-of-interest (ROI) was set in the middle of the mitral valve at the level of its ...
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Low Wall Shear Stress Is Associated with Local Aneurysm Wall Enhancement on High Resolution MR Vessel Wall Imaging
... Hemodynamic Analysis Three hemodynamic parameters, which were time-averaged over a cardiac cycle of enhanced area, nonenhanced area, the whole aneurysm, and parent artery, respectively, [r] ...
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Zonal variation in atheroscleric aorta: Is it a fact?
... the cardiac cycle (R-R interval), whereas perspective gating invokes on a step-and-shoot model, where around 26% of the cardiac cycle (late diastolic phase) is imaged [22, ...
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Using learned under-sampling pattern for increasing speed of cardiac cine MRI based on compressive sensing principles
... In this article, we will consider both topics for cardiac cine MRI. First, we will present a solution to sample some k-space trajectories. To this end, we fill the upper half of k-space completely for odd time ...
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Automated aortic doppler flow tracing for reproducible research and clinical measurements
... the cardiac cycle length in pixels computed previously; any frequency 10 times higher than the fundamental frequency of the heart motion is filtered ...
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Automated analysis of color tissue Doppler velocity recordings of the fetal myocardium using a new algorithm
... fetal cardiac function, but there is a lack of standardization concerning image acquisition, data analysis and post- ...of cardiac cycle time intervals, and a larger ROI size seems to optimize traces ...
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Computational model of blood flow in the aorto-coronary bypass graft
... At the start of diastole, there exists a small amount of back-flow into the left ventricle through the aortic inlet (Figure 3a). For the rest of the diastolic phase, the aortic valve remains closed. In all these cases, ...
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Design and testing of an MRI-compatible cycle ergometer for non-invasive cardiac assessments during exercise
... the cardiac response to exercise using MRI technology, and the major- ity have used commercially available MRI-compatible cycle ergometers at fixed work- loads to evaluate left ventricular function and ...
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