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• W1785994295 endingPage "1888" @default.
• W1785994295 startingPage "1888" @default.
• W1785994295 abstract "Using coherent light interrogating a turbid object perturbed by a focused ultrasound (US) beam, we demonstrate localized measurement of dynamics in the focal region, termed the region-of-interest (ROI), from the decay of the modulation in intensity autocorrelation of light. When the ROI contains a pipe flow, the decay is shown to be sensitive to the average flow velocity from which the mean-squared displacement (MSD) of the scattering centers in the flow can be estimated. While the MSD estimated is seen to be an order of magnitude higher than that obtainable through the usual diffusing wave spectroscopy (DWS) without the US, it is seen to be more accurate as verified by the volume flow estimated from it. It is further observed that, whereas the MSD from the localized measurement grows with time as &#x3C4;&#x3B1; with &#x3B1;&#x2248;1.65, without using the US, &#x3B1; is seen to be much less. Moreover, with the local measurement, this super-diffusive nature of the pipe flow is seen to persist longer, i.e., over a wider range of initial &#x3C4;, than with the unassisted DWS. The reason for the super-diffusivity of flow, i.e., &#x3B1;<2, in the ROI is the presence of a fluctuating (thermodynamically nonequilibrium) component in the dynamics induced by the US forcing. Beyond this initial range, both methods measure MSDs that rise linearly with time, indicating that ballistic and near-ballistic photons hardly capture anything beyond the background Brownian motion." @default.
• W1785994295 created "2016-06-24" @default.
• W1785994295 creator A5003041923 @default.
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• W1785994295 date "2015-09-29" @default.
• W1785994295 modified "2023-09-29" @default.
• W1785994295 title "Detection and estimation of liquid flow through a pipe in a tissue-like object with ultrasound-assisted diffuse correlation spectroscopy" @default.
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• W1785994295 doi "https://doi.org/10.1364/josaa.32.001888" @default.
• W1785994295 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26479942" @default.
• W1785994295 hasPublicationYear "2015" @default.
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