ABOUT THE APPLICATION OF THE VAN CITTERT-ZERNIKE THEOREM IN ULTRASONIC-IMAGING
ABOUT THE APPLICATION OF THE VAN CITTERT-ZERNIKE THEOREM IN ULTRASONIC-IMAGING
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DOI：
10.1109/58.393102
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发表时间：
1995-07-01
影响因子：
3.6
通讯作者：
WAAG, RC
中科院分区：
文献类型：
--
作者：
LIU, DL;WAAG, RC
通过分析和计算，研究了货车Cittert-Zernike定理在超声成像系统中的具体应用情况，得到了信号在时间和空间上离散且长度有限时非相干源的互相干函数的表达式，表达式还获得了统计和有效的信号-描述具有有限信号长度的非相干源的假设中的误差的噪声比，对于不同的信号长度和不同的脉冲窗口，结果表明，根据货车Cittert-Zernike定理，为了满足图像重建的非相干性要求，需要具有较长有效长度的超声信号。尽管货车Cittert-Zernike定理可以用于估计成像系统孔径中超声信号的相干长度，当需要像当前B扫描中那样的深度分辨率时，需要特殊的数据采集技术来令人满意地重建超声图像。
The specific circumstances under which the van Cittert-Zernike theorem applies in ultrasonic imaging systems are examined through analysis and computations, Expressions are obtained for the mutual coherence function of an incoherent source when the signals are discrete in time and space and have finite lengths, Expressions are also obtained for statistics and effective signal-to-noise ratios that describe the error in the assumption of an incoherent source with finite signal lengths, Images of a one-dimensional source are reconstructed for different signal lengths and different pulse windows, The results show that ultrasonic signals with a relatively long effective length are needed to satisfy the incoherence requirement for image reconstruction based on the van Cittert-Zernike theorem, Consequently, although the van Cittert-Zernike theorem may be used to estimate the coherence length of ultrasonic signals in the aperture of an imaging system, special data acquisition techniques are needed for satisfactory reconstruction of ultrasonic images when depth resolution like that in current b-scans is required.