Synthetic aperture focusing ultrasonic imaging method based on compression perception
A technology of synthetic aperture focusing and ultrasonic imaging method, which is applied in the direction of re-radiation of sound waves, utilization of re-radiation, measurement devices, etc., can solve the problems of reducing computational complexity, large amount of data, and difficult real-time imaging, etc., to reduce computational complexity , the effect of reducing the dimensionality
Active Publication Date: 2019-05-07
无锡天工捷通科技有限公司
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[0003] Purpose of the invention: Aiming at the shortcomings of large amount of data, high system complexity and difficult real-time imaging in the SAF ultrasonic imaging process, the present invention proposes a synthetic aperture focused ultrasonic imaging method based on compressed sensing, which effectively reduces the dimension of the data matrix and reduces the Computational complexity, better recovery of synthetic aperture focusing imaging
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[0062] The parameters used in the following examples are as follows:
[0063] 64 uniform linear arrays with equal spacing composed of ultrasonic transducers, transmitting signal frequency f 0 = 3MHz, sampling frequency f s =100MHz, sound velocity c=1540m / s, array element spacing is d=c / 2f 0 , the scanning mode of the ultrasonic signal is SAF, a total of 6 scattering points are set along the z-axis direction, uniformly distributed in the range of 20-70mm, and the interval is 10mm, and the DWT transformation uses "rbio6.8" in the ReverseBior wavelet system, single column The echo signal is the data of the 32nd scan, and the noise and interference are all subject to the standard normal distribution.
[0064] Figure 4 It is the sparse representation of the single row echo signal under three kinds of sparse bases. In the figure, the vertical axis represents the normalized amplitude of the received signal, and the horizontal axis represents the number of sampling points. Figur...
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The invention discloses a synthetic aperture focusing ultrasonic imaging method based on compression perception. The invention utilizes a compression perception theory and a synthetic aperture focusing ultrasonic imaging mode, and combines a measurement matrix in the compression perception theory with a channel weight in the synthetic aperture focusing scanning mode on the premise of obtaining anoriginal array echo signal, so that an array is non-uniformly sampled in a signal receiving process, and a measurement signal is obtained. A sparse matrix and the measurement matrix are obtained by respectively calculating the original array echo signal and the measurement signal, and the sparse matrix and the measurement matrix are imported into a reconstruction algorithm to reconstruct a data matrix for subsequent imaging processing. According to the synthetic aperture focusing ultrasonic imaging method based on compression perception, the dimension of the data matrix is effectively reduced,the calculation complexity is reduced, the synthetic aperture focusing imaging map is recovered, and the theoretical reference is provided for ultrasonic real-time imaging.
Description
technical field [0001] The invention relates to the field of synthetic aperture hyperfocused acoustic imaging, in particular to a synthetic aperture focused ultrasonic imaging method based on compressed sensing. Background technique [0002] Synthetic aperture ultrasound imaging is a novel medical ultrasound imaging method. Because it can generate high-resolution and high-contrast ultrasound images, it has become a commonly used method in modern digital medical ultrasound imaging (see literature: Wang Dongya, Yu Chenglong, Peng Hu . FPGA-based synthetic aperture ultrasound imaging beamforming design[J]. Journal of University of Science and Technology of China, 2014,44(2):147-152.). Synthetic aperture technology realizes the dynamic focusing of transmission and reception, and needs to store the echo data generated each time. The amount of data storage is very large, which directly and indirectly affects the complexity of hardware implementation and the imaging frame rate. Co...
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IPC IPC(8): G01S15/89G01S7/52
Inventor 郭业才陈晨季晓星王超
Owner 无锡天工捷通科技有限公司