啁啾编码脉冲激励超声弹性成像

Hui Peng, D. Liu
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引用次数: 4

摘要

首先设计了两种啁啾编码的激励/压缩方案,并将其应用于超声弹性成像的仿真方法。仿真结果表明,在低回波信噪比(eSNR)条件下,啁啾编码脉冲弹性成像的性能远优于传统短脉冲,啁啾编码脉冲应变图像的弹性信噪比(SNRe)是衰减、电子噪声、外加应变、脉冲长度、压缩滤波器和深度的函数。比较了两种啁啾编码激励/压缩方案对应变成像的影响,证明了在低eSNR条件下,第一种方案,即带窗口的啁啾激励脉冲与匹配的压缩滤波器相结合,适用于低衰减情况,第二种方案,即无窗口的啁啾激励脉冲与不匹配的压缩滤波器相结合,适用于高衰减情况。最后,将第二种啁啾编码方案应用于实时徒手超声应变成像系统,仿真实验结果与仿真方法一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chirp-Coded Pulse Excitation for Ultrasound Elasticity Imaging
We first designed two chirp-coded excitation/ compression schemes which were applied to ultrasound elasticity imaging in simulation method using Field II. The simulation results demonstrate that in low echo-signal-to-noise ratio (eSNR) conditions, the performance of chirp-coded pulse for elasticity imaging is much better than the conventional short pulse, and indicate that elastographic signal-to-noise ratio (SNRe) of strain images for chirp-coded pulse is a function of attenuation, electronic noise, applied strain, pulse length, compression filter and depth. Comparing the effects of two chirp-coded excitation/compression schemes on strain imaging, we demonstrate that under the conditions of low eSNR, the first scheme, the combination of chirp excitation pulse with window and matched compression filter, is suitable to be used in low attenuation situations, and the second scheme, the combination of chirp excitation pulse without window and mismatched compression filter, is fit to be used in high attenuation situations. Finally, we applied the second chirp-coded scheme to a real-time freehand ultrasound strain imaging system and phantom experimental results are consistent with that in simulation method.
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