Synthetic aperture ultrasonic imaging system for calculating delay time based on non-linear correlation

Abstract

The invention belongs to the field of ultrasonic imaging, and discloses a synthetic aperture ultrasonic imaging system for calculating delay time based on non-linear correlation. The synthetic aperture ultrasonic imaging system for calculating the delay time based on the non-linear correlation comprises a channel receiving and amplifying module, a channel amplifying and driving module, an analog / digital (A / D) conversion module, a digital / analog (D / A) conversion module, a sampling control module, a wave beam synthesizing module, a wave beam forming module, an emission control module, a universal serial bus (USB) subsidiary communication module and a USB communication module. The wave beam synthesizing module calculates the delay time of reconstruction of a synthetic aperture based on the non-linear correlation, and can solve the problem that large deviation exists between a synthetic aperture focusing algorithm based on the delay superposition and reality when the delay time of a transducer and theoretical calculation time differ so much.

Description

technical field [0001] The invention relates to a synthetic aperture focused ultrasonic imaging system based on nonlinear correlation calculation delay time, belonging to the field of ultrasonic imaging. Background technique [0002] The use of synthetic aperture technology can use small-aperture practical elementary transducers and low operating frequencies to detect and observe distant targets with high azimuth resolution. It breaks through the limitations of classical concepts and solves some conflicting requirements on system design parameters in direct imaging technology. As early as 1967, John J.Flaherty et al. of Magnaflux Company applied for the patent of "Synthetic Aperture Ultrasonic Imaging System", and proposed for the first time to apply the concept of "aperture synthesis" in the synthetic aperture radar to the field of ultrasonic imaging. Invention to improve the resolution of ultrasound systems. [0003] Chinese patent 200410077557.1 proposes a receiving met...

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Problems solved by technology

[0004] However, in the experimental research on focused ultrasound through synthetic holes, it is found that for multi-element transducers, the acoustic beams radiated by each element transducer will interfere with each other, making the total sound field distribution very complicated, and the delay time is different from the theoretical calculation. In this case, the synthetic aperture focusing algorithm based on delay superposition will have a large deviation from the actual

It can be seen from the simulation that the delay error will have a great impact on the imaging quality of the synthetic aperture focusing

For the discussion of this problem, none of the above-mentioned patents mentioned

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