O'Donnell M, Silverstein S D
General Electric Corp., Res. and Dev., Schenectady, NY.
IEEE Trans Ultrason Ferroelectr Freq Control. 1988;35(4):470-6. doi: 10.1109/58.4184.
Incoherent averaging of measurements made at different look directions can be used to reduce speckle noise in medical ultrasound images. An analytic expression for the correlation between two measurements made at different spatial positions is derived. Using this expression, the optimum aperture displacement for efficient incoherent averaging (i.e. compounding) is computed and found to equal approximately one-half the aperture length.
对不同观察方向上进行的测量进行非相干平均，可用于降低医学超声图像中的斑点噪声。推导了在不同空间位置进行的两次测量之间相关性的解析表达式。利用该表达式，计算出有效非相干平均（即复合）的最佳孔径位移，发现其约等于孔径长度的一半。
