Comput Math Methods Med - A new high-resolution spectral approach to noninvasively evaluate wall deformations in arteries.

Tópicos

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Resumo

By locally measuring changes on arterial wall thickness as a function of pressure, the related Young modulus can be evaluated. This physical magnitude has shown to be an important predictive factor for cardiovascular diseases. For evaluating those changes, imaging segmentation or time correlations of ultrasonic echoes, coming from wall interfaces, are usually employed. In this paper, an alternative low-cost technique is proposed to locally evaluate variations on arterial walls, which are dynamically measured with an improved high-resolution calculation of power spectral densities in echo-traces of the wall interfaces, by using a parametric autoregressive processing. Certain wall deformations are finely detected by evaluating the echoes overtones peaks with power spectral estimations that implement Burg and Yule Walker algorithms. Results of this spectral approach are compared with a classical cross-correlation operator, in a tube phantom and "in vitro" carotid tissue. A circulating loop, mimicking heart periods and blood pressure changes, is employed to dynamically inspect each sample with a broadband ultrasonic probe, acquiring multiple A-Scans which are windowed to isolate echo-traces packets coming from distinct walls. Then the new technique and cross-correlation operator are applied to evaluate changing parietal deformations from the detection of displacements registered on the wall faces under periodic regime.

Resumo Limpo

local measur chang arteri wall thick function pressur relat young modulus can evalu physic magnitud shown import predict factor cardiovascular diseas evalu chang imag segment time correl ultrason echo come wall interfac usual employ paper altern lowcost techniqu propos local evalu variat arteri wall dynam measur improv highresolut calcul power spectral densiti echotrac wall interfac use parametr autoregress process certain wall deform fine detect evalu echo overton peak power spectral estim implement burg yule walker algorithm result spectral approach compar classic crosscorrel oper tube phantom vitro carotid tissu circul loop mimick heart period blood pressur chang employ dynam inspect sampl broadband ultrason probe acquir multipl ascan window isol echotrac packet come distinct wall new techniqu crosscorrel oper appli evalu chang pariet deform detect displac regist wall face period regim

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