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Communication Dans Un Congrès Année : 2014

Effective Medium Theory for Ultrasound Blood Characterization

Résumé

An Effective Medium Theory combined with the Structure Factor Model (EMTSFM) has been recently developed to model the backscattering response from aggregated red blood cells (RBCs). Quantitative Ultrasound technique based on the EMTSFM aims to estimate two clinical relevant parameters: cluster size and compacity, assuming that we know the hematocrit a priori. The EMTSFM assumes that clusters of RBCs can be treated as individual homogeneous scatterers, which have effective properties determined by the acoustical characteristics and concentration of RBCs within clusters. The scattering interaction between clusters is modeled using the structure factor. In the present study, an improved version of EMTSFM is proposed using a novel expression for the backscatter cross-section of one cluster. The new backscatter cross-section consists in summing the coherent component, corresponding to the average wave emerging from the effective scatterer, and the incoherent component, corresponding to the fluctuation of the scattering wave around its average within the effective scatterer. In particular, the incoherent component is based on a model of the scattering interaction between RBCs inside the cluster to obtain a refined approximation of the wave emerging from the effective scatterer. Simulated backscattering responses show that the improved version of the EMTSFM is more accurate in higher frequency in comparison with the classical EMTSFM.
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Dates et versions

hal-01297425 , version 1 (04-04-2016)

Identifiants

  • HAL Id : hal-01297425 , version 1

Citer

Romain de Monchy, François Destrempes, Ratan K Saha, Emilie Franceschini, Guy Cloutier. Effective Medium Theory for Ultrasound Blood Characterization. 9th International Conference on Ultrasonic Biomedical Microscanning, Sep 2014, Peebles, United Kingdom. ⟨hal-01297425⟩
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