METHOD AND DEVICE FOR IMPROVING THE RESOLUTION OF AN ULTRASOUND IMAGE

摘要

The invention relates in particular to a method for improving the resolution of an ultrasound image of a biological tissue or of an object, the method comprising steps in which: radiofrequency lines emanating from the biological tissue or from the object are received so as to generate the ultrasound image in the form of a radiofrequency matrix comprising the radiofrequency lines; a processing based on an autoregressive parametric model is applied so as to determine an autoregressive estimation of an envelope of the radiofrequency lines, the step of processing by an autoregressive parametric model comprising a step of determining the optimal autoregression parameters according to an optimal autoregression order in which: a data vector is created by juxtaposing a transform of the radiofrequency lines; an instrument vector is created by delaying the samples of the data vector by a delay; the covariance matrix M of the data vector and of the instrument vector is calculated; the covariance matrix M is factorized so as to determine the optimal autoregression parameters according to an optimal autoregression order, in which the covariance matrix is factorized in the form M = UDVH, in which D is a diagonal matrix, U is a matrix comprising the parameters of the autoregressive model and V is a matrix of the intermediate parameters, the matrix V being different from the matrix U.