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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >About the application of the van Cittert-Zernike theorem inultrasonic imaging
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About the application of the van Cittert-Zernike theorem inultrasonic imaging

机译：关于van Cittert-Zernike定理超超声成像的应用

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摘要

The specific circumstances under which the van Cittert-Zernikentheorem applies in ultrasonic imaging systems are examined throughnanalysis and computations. Expressions are obtained for the mutualncoherence function of an incoherent source when the signals are discretenin time and space and have finite lengths. Expressions are also obtainednfor statistics and effective signal-to-noise ratios that describe thenerror in the assumption of an incoherent source with finite signalnlengths. Images of a one-dimensional source are reconstructed forndifferent signal lengths and different pulse windows. The results shownthat ultrasonic signals with a relatively long effective length arenneeded to satisfy the incoherence requirement for image reconstructionnbased on the van Cittert-Zernike theorem. Consequently, although the vannCittert-Zernike theorem may be used to estimate the coherence length ofnultrasonic signals in the aperture of an imaging system, special datanacquisition techniques are needed for satisfactory reconstruction ofnultrasonic images when depth resolution like that in current b-scans isnrequired
机译：通过分析和计算，研究了范·奇特-泽尼克定理在超声成像系统中的具体应用情况。当信号在时间和空间上离散并且具有有限的长度时，可以获得非相干源互相干函数的表达式。还获得了用于统计和有效信噪比的表达式，这些表达式描述了在假设信号长度有限的不相干源的情况下的误差。针对不同的信号长度和不同的脉冲窗口重建一维源图像。结果表明，基于van Cittert-Zernike定理，需要有效长度相对较长的超声信号来满足图像重建的非相干性要求。因此，尽管可以使用vannCittert-Zernike定理估计成像系统孔径中的超声信号的相干长度，但是当需要像当前b扫描那样的深度分辨率时，仍需要特殊的数据采集技术来令人满意地重建超声图像。

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