“…[28][29][30] Another example is a recent study by Bateman et al, 31 which showed that early vascular dementia is characterized by increased blood flow pulsation.…”
BACKGROUND AND PURPOSE:The tortuous distal part of the ICA may have an attenuating effect on pulsatile arterial flow. We investigated local arterial blood flow patterns in the ICA proximal and distal to the carotid siphon to detect quantitative waveform changes.
“…[28][29][30] Another example is a recent study by Bateman et al, 31 which showed that early vascular dementia is characterized by increased blood flow pulsation.…”
BACKGROUND AND PURPOSE:The tortuous distal part of the ICA may have an attenuating effect on pulsatile arterial flow. We investigated local arterial blood flow patterns in the ICA proximal and distal to the carotid siphon to detect quantitative waveform changes.
“…This mechanism involves a progressive dampening of arterial pulsations, mostly through the CSF, in order to reach the capillary bed of the brain as a nonpulsatile flow [45,46]. In normal cerebral blood flow this occurs as a consequence of a close coupling between CSF oscillations and arterial pulsations, which leads to a resonance state [46].…”
Section: Respiratory and Pulse-driven Abnormalities In Nphmentioning
“…This was performed by subtracting the net flow from the flow waveform and then calculating the cumulative integral over the remaining waveform (Fig 3). The difference between the maximum and minimum of this volume variation was defined as ⌬V [4][5][6] and corresponds to the cyclic distention of downstream arteries required to convert the pulsatile arterial flow to a nonpulsatile capillary flow. Mathematically, this can be expressed as:…”
Section: Net Flow and Pulsatilitymentioning
confidence: 99%
“…Therefore, this measure is sensitive to the balance of factors such as downstream and upstream arterial compliance and cardiac stroke volume and thus provides a mechanically relevant alternative for analyzing vascular pulsatility. 6 Traditionally, intracranial vascular pulsatility is estimated by use of Doppler sonography techniques 1 or 2D PCMRI scans. 4 These methods are associated with laborious workflows and rely on a trained neurovascular imager to make skillful interpretations and vessel localizations during the acquisition.…”
BACKGROUND AND PURPOSE: 4D PCMRI can be used to quantify pulsatile hemodynamics in multiple cerebral arteries. The aim of this study was to compare 4D PCMRI and 2D PCMRI for assessments of pulsatile hemodynamics in major cerebral arteries.
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