Method for designing high-efficiency sparse dictionary in synthetic aperture compressed sensing ultrasonic imaging

Abstract

The invention publishes a method for designing a high-efficiency sparse dictionary in synthetic aperture compressed sensing ultrasonic imaging, and belongs to the technical field of ultrasonic imaging. The method includes the following steps: performing amplification processing and A / D conversion on a continuous echo signal received by an ultrasonic array, thereby obtaining an echo signal x required by ultrasonic imaging; selecting a delta matrix as a measurement matrix of synthetic aperture compressed sensing ultrasonic imaging, and performing non-uniform compressed sampling on the echo signal x to obtain a measurement signal y; and utilizing a transmission pulse as a primary function to construct a high-efficiency sparse dictionary psi; and building a mathematical model of synthetic aperture compressed sensing ultrasonic imaging according to the delta matrix, the measurement signal y and the high-efficiency sparse dictionary , obtaining a reconstructed original echo signal x<~> through the model and a reconstruction algorithm, and utilizing the reconstructed original echo signal x<~> to perform beam composition and finally realizing imaging. The method for designing the high-efficiency sparse dictionary in synthetic aperture compressed sensing ultrasonic imaging can enable the echo signal to realize the same recovery effect with a higher compression ratio, further reduce the data volume that needs to be stored for synthetic aperture imaging and reduce the complexity of an ultrasonic imaging system.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and in particular relates to a method for designing a high-efficiency sparse dictionary in synthetic aperture compressed sensing ultrasonic imaging. Background technique [0002] Synthetic aperture imaging is a method used to improve image resolution and image quality in ultrasound imaging. This technology was first proposed by Passman in 1996. The basic idea is that a single array element transmits pulse signals sequentially, and all array elements receive scattered signals from the detection area at the same time, and then process all array element data to obtain the final medical image. The amount of echo data to be stored is huge, which increases the complexity of hardware implementation. Compressed sensing is a solution proposed for high-speed data acquisition and large-capacity data storage in recent years. The theory believes that when the signal itself or in a certain transfor...

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Problems solved by technology

However, the common sparse matrix lacks pertinence, especially when it is applied to a signal with repeated superposition characteristics such as ultrasonic echo signal, it does not make full use of the characteristics of the signal itself, so its sparse representation ability is limited and the reconstruction accuracy is low. It is difficult to guarantee the effect of reconstructed image under low compression rate

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