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Dynamic aperture integrating compressive sensing ultrasonic beam forming method

A compressed sensing and dynamic aperture technology, applied in the re-radiation of sound waves, radio wave measurement systems, instruments, etc., can solve problems such as poor imaging resolution, improve lateral resolution, reduce the amount of sampled data, and increase sparsity Effect

Inactive Publication Date: 2015-09-16
CHONGQING UNIV
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Problems solved by technology

But in the near-field region, the larger the aperture, the larger the spread angle of the beam, and the worse the imaging resolution

Method used

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  • Dynamic aperture integrating compressive sensing ultrasonic beam forming method
  • Dynamic aperture integrating compressive sensing ultrasonic beam forming method
  • Dynamic aperture integrating compressive sensing ultrasonic beam forming method

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Embodiment Construction

[0018] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0019] The present invention provides a compressive sensing ultrasonic beam synthesis method that integrates dynamic aperture, and improves the traditional ultrasonic beam synthesis algorithm under high sampling rate, including the following steps:

[0020] (1) According to the formula Calculate the focal point at depth F k The number of enabled array elements N k ; will detect the depth F k Sampling point serial number S corresponding to the ultrasonic echo signal k ; By monitoring the number of sampling points of the ultrasonic echo signal in real time, when the number of sampling points n is equal to S k When , increase the turn-on number of array elements close...

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Abstract

The invention discloses a dynamic aperture integrating compressive sensing ultrasonic beam forming method. The method comprises the steps of firstly adopting a delta matrix to act as a measurement matrix of a compressive sensing theory in an ultrasonic beam forming system, then selecting a cosine transformation matrix to act as a sparse matrix of the compressive sensing theory, and carrying out organic integration on a dynamic aperture technology and the measurement matrix of the compressive sensing technology, thereby realizing the dynamic aperture integrating compressive sensing ultrasonic beam forming method. The method disclosed by the invention can reduce a burden brought about by a high sampling rate for data sampling, transmission and storage of an ultrasonic imaging system, and enables acquisition of ultrasonic images with high longitudinal resolution to become possible. In addition, introduction of the dynamic aperture technology also further increases the sparseness of ultrasonic echo signals, the sampling data volume is reduced, and the transverse resolution of near-field ultrasonic images is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and in particular relates to a compressive sensing ultrasonic beam synthesis method with dynamic aperture fusion. Background technique [0002] In the ultrasonic imaging system, in order to improve the longitudinal resolution of the ultrasonic image, it is generally realized by increasing the sampling rate of the system. But a high sampling rate will bring a huge burden to the data acquisition, storage and transmission of the ultrasound hardware system. Compressive sensing theory (Compressive sensing, CS) points out that when the signal itself or in a certain transform domain has sparsity, all the information of the signal can be reconstructed from a small amount of sampled data by solving the optimization problem. In an ultrasound imaging system, the larger the aperture, the narrower the main lobe of beamforming and the lower the side lobes. But in the near-field region, the larger ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/89
CPCG01S15/8997
Inventor 王平李娜王思奇程娜龚志辉潘震杜炜李刚健
Owner CHONGQING UNIV
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