弹性成像中动态范围扩展和信噪比提高的方法

E. Konofagou, S. Alam, J. Ophir, T. Krouskop
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引用次数: 8

摘要

讨论了增大动态范围和提高弹性成像信噪比(SNR/sub /)的两种方法。一种方法是通过从众多应变估计中选择具有最高信噪比/sub - e/的应变估计,使用可变施加应变来扩大弹性动态范围。第二种是一种全新的估计器,通过对加窗后压缩射频回波信号的迭代时间拉伸算法估计应变。作者使用二维有限元模拟和由此产生的实验应变滤波器来检验这些方法。最后,这两种方法的结合显示出具有更高动态范围和信噪比/sub /的弹性图。
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Methods for dynamic range expansion and enhancement of the signal-to-noise ratio in elastography
Two methods are discussed to increase the dynamic range and enhance the signal-to-noise ratio in elastography (SNR/sub e/). One method uses variable applied strains to expand the elastographic dynamic range by selecting the strain estimates with the highest SNR/sub e/ out of a multitude of strain estimates. The second one is a completely new estimator that estimates the strain by an iterative temporal stretching algorithm of the windowed postcompression RF echo signal. The authors examine these methods using 2D finite element simulations and resulting experimental strain filters. Finally, the combination of these two methods is shown to produce an elastogram with higher dynamic range as well as SNR/sub e/.
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