AN IMAGING DEVICE WITH IMAGE ACQUISITION RATE OPTIMIZATION

摘要

The invention relates to a method of acquiring high-resolution ultrasound images of a medium (M) using an array of N transducers (T1 to TN) using successive transmission matrices, characterized in that it comprises the steps of defining an area of interest (D1) in a preliminary image (ZI); determining inter-transducer correlation matrices corresponding to the area of interest (D1) and to the unwanted area; determining a characteristic matrix (MC) of the area of interest (D1) resulting from the product of the inverse of the inter-transducer correlation matrix of the unwanted area by the inter-transducer correlation matrix of the area of interest (D1); calculating the eigenvectors and values of the characteristic matrix (MC) of the area of interest (D1) to define a transmission matrix; adjusting a trade-off between the image acquisition rate and image quality in the area of interest (D1) in order to define a number K of eigenvectors for firing; multiplying a reception matrix constituted of the acquired signals completed by data set to zero corresponding to the firings not effected by the inverse of the transmission matrix to obtain a complete data set; reconstructing the high-resolution image corresponding to the area of interest (D1) as in synthetic aperture echographic imaging methods.