Beam-forming method for ultrasonic imaging by adoption of generalized sidelobe cancellation based on feature structure
A generalized sidelobe cancellation, ultrasonic imaging technology, applied in ultrasonic/acoustic/infrasonic diagnosis, sonic diagnosis, infrasonic diagnosis, etc., can solve the problem of large decrease in minimum variance robustness
Inactive Publication Date: 2015-10-14
CHONGQING UNIV
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Especially when there is noise in the ultrasound echo data, the robustness of the minimum variance and generalized sidelobe cancellation algorithms drops greatly
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[0051] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0052] Figure 5 It is a schematic flow chart of the method of the present invention. As shown in the figure, the method includes the following steps: Step 1: Perform amplification processing and AD conversion on the echo signal received by the ultrasonic array element to obtain the echo data required for ultrasonic imaging ; Step 2: Divide the receiving array into sub-arrays with an overlapping array element in turn, and then perform forward smoothing processing on the echo signals received by the corresponding divided sub-arrays to obtain the sample covariance matrix; Step 3: Calculate the sample covariance The matrix is loaded diagonally to obtain the forward spatial covariance matrix estimate; Step 4: Combine the spatial covariance matrix estimate with the direction vector to calculate the adaptive beam weight vector; Step 5: Construc...
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The invention relates to a beam-forming method for ultrasonic imaging by adoption of generalized sidelobe cancellation based on a feature structure. The method comprises following steps: firstly, delay-time and forward-smoothing processing of sampling signals of receiving array elements; obtaining a forward spatial covariance matrix estimation; loading forward spatial covariance matrixes; combining the forward spatial covariance matrix estimation with direction vectors; calculating optimal self-adaptive weighting vectors based on the minimum variance principle; configuring a generalized sidelobe canceller with minimum variance in the equivalent solution in order to obtain two parts of self-adaptive and non-adaptive weighting vectors; decomposing characteristics of the forward spatial covariance matrix estimation of receipt signals and configuring characteristic threshold signal subspace; projecting integral weighting vectors to left singular vector space of the characteristic threshold signal subspace in order to obtain self-adaptive beam weighting vectors; and utilizing weighting vectors obtained from projection and receipt data of ultrasonic array elements to undergo the point multiplication in order to obtain ultrasonic beam synthesized data. The beam-forming method for ultrasonic imaging by adoption of generalized sidelobe cancellation based on the feature structure has following beneficial effects: characteristic vectors with great interference can be eliminated such that a higher anti-noise capacity of ultrasonic images and better image resolution are acquired.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and relates to a generalized sidelobe cancellation ultrasonic imaging beam synthesis method based on a characteristic structure. Background technique [0002] Ultrasound has the advantages of harmlessness to the human body, real-time imaging, and low cost. It is currently widely used in the field of medical detection of blood vessels, abdominal cavity, heart and other organs. Ultrasound imaging algorithm is the key technology of ultrasound imaging. Time-lapse superposition is currently the simplest, most traditional, and most widely used imaging technique. The imaging speed of this method is fast, but the resolution is low and the grating lobe is serious. [0003] At present, the minimum variance adaptive beamforming method is widely used to overcome this shortcoming of the delay-and-addition algorithm. It is based on the principle of keeping the desired direction gain unchanged and ...
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Login to View More IPC IPC(8): A61B8/00
CPCA61B8/5207A61B8/5215A61B8/5269
Inventor 王平程娜龚志辉李娜潘震杜炜李刚建
Owner CHONGQING UNIV