Method and system for plane wave ultrasound imaging and microbubble imaging with compressive adaptive beamforming

Abstract

The invention provides methods and systems for ultrasonic imaging and microbubble imaging of plane waves based on compressive adaptive beam forming. The compressive adaptive beam forming algorithm is adopted, each array element receives useful frequency point information of data, and the useful frequency point information is all centralized in effective bandwidth of an ultrasonic echo signal, so that the data in the effective bandwidth is subjected to compressive sensing treatment instead of the whole frequency domain, and on the basis of frequency-domain adaptive beam forming, the number of frequency-domain sampling points is reduced and calculated amount required during beam forming is reduced; plane wave imaging is adopted, so that a problem of transient change of microbubbles in conventional ultrasonic imaging is solved; the whole microbubble distribution region is covered by emitting planar ultrasonic waves once, so that a microbubble distribution image in the whole imaging plane is obtained; microbubble imaging of ultrasonic plane wave emission is adopted, so that the time resolution on microbubble imaging is very high.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection and ultrasonic imaging, and specifically relates to a compression adaptive ultrasonic beam synthesis algorithm, and combined with plane wave ultrasonic emission, proposes a space-time high-resolution, high signal-to-noise ratio compression adaptive beam synthesis plane wave ultrasonic An imaging method and system, as well as a plane wave ultrasonic microbubble imaging method and system with high frame rate and low calculation amount of compressive adaptive beamforming. Background technique [0002] Delay and Sum (DAS) beamforming is a traditional, simple and most widely used imaging method in ultrasound imaging. It applies a specific delay to the ultrasound echo signals received by different channels and then sums them up to obtain the target focus signal. The DAS method is independent of the received echo signal and uses a predefined and fixed weighting coefficient, which does not m...

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Problems solved by technology

However, for the transient physical information of microbubbles, the Line-by-line method of B-mode causes a time difference between different scanning lines of the same frame image, and its frame rate is generally 100Hz, so the time resolution cannot meet the needs of microbubbles. Study on the transient characteristics of

The Fink group proposed an ultra-fast active cavitation imaging method, which uses a full aperture to emit a plane wave along the axial direction to monitor the cavitation process, that is, the ultrasonic plane wave is used for microbubble imaging, but because the plane wave is emitted instead of focused ultrasound beam, which has poor sensitivity and lateral resolution

The team also used the plane wave composite fast ultrasonic imaging method for the detection and imaging of cavitation nucleation. This method realizes high frame rate real-time imaging through plane wave emission, and proposes that the coherent wave composite at different angles improves the imaging signal-to-noise ratio, but the improvement of the signal-to-noise ratio To a certain extent, the imaging frame rate is sacrificed, resulting in a decrease in the temporal resolution of the imaging, making it difficult to capture the instantaneous information of the microbubble dynamics

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