Research on synthetic aperture focusing ultrasonic imaging based on phase coherence in frequency domain

被引：0
|
作者：
Mao Q. [1 ]
Chen Y. [1 ,2 ]
Shi W. [1 ]
Lu C. [1 ,3 ]
Li Q. [1 ]
机构：
[1] Key Laboratory of Non-destructive Testing Technology, Nanchang Hangkong University, Nanchang
[2] State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing
[3] Gannan Normal University, Ganzhou
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2020年 / 41卷 / 02期
关键词：
Frequency domain; Phase circular statistics vector; Synthetic aperture focusing technique (SAFT); Ultrasonic;
D O I：
10.19650/j.cnki.cjsi.J1905868
中图分类号：
学科分类号：
摘要：
In order to improve the imaging quality and efficiency of synthetic aperture focusing technique (SAFT), a frequency domain SAFT ultrasonic imaging algorithm based on phase circular statistics vector (PCSV) is proposed. Firstly, the Hilbert transform and Euler's formula are used to extract the instantaneous phase of the signals in wave field record. Secondly, the real part and imaginary part of the instantaneous phase are regarded as the PCSVs distributed in circular complex plane, and through wave field extrapolation, the phase coherence factor used for frequency domain SAFT weighting is constructed. Finally, the high quality frequency domain SAFT-PCSV image is obtained through weighting processing. The imaging results show that the frequency-domain SAFT-PCSV imaging algorithm effectively enhances the image resolution and signal-to-noise ratio. Under the same test conditions, the operational time and occupied memory space of the frequency-domain SAFT-PCSV imaging algorithm are less than 1/46, and 1/47 of those of traditional time-domain SAFT algorithm, respectively. © 2020, Science Press. All right reserved.
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页码：135 / 145
页数：10
相关论文
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