Delay-encoded cascaded waves pulse delays

Overview of optimal delay-encoding for delay-encoded cascaded waves, to improve the signal-to-noise ratio in ultrafast ultrasound imaging. The pulse delays are selected through a numerical optimization of an analytical expression describing the SNR gain, which depends only on the time delays and the probe bandwidth. Delays are determined within a bandwidth corresponding to a P4-1 (Philips), C1-6-D (GE HealthCare), L12-3v (Verasonics), or L22-8v (Verasonics) ultrasound probe. The theoretical gain in SNR for varying sacrificial depths (2.5 mm to 20 mm) and number of pulses per train (3 to 8). The time delays are the corresponding time delays between the first pulse of the train and pulse i (starting from i=2).

针对延迟编码级联波的最优延迟编码方案概述，旨在提升超快速超声成像中的信噪比（Signal-to-Noise Ratio, SNR）。脉冲时延通过对描述信噪比增益的解析表达式开展数值优化确定，该增益仅与时延及探头带宽相关。时延的取值范围对应P4-1（飞利浦）、C1-6-D（通用电气医疗）、L12-3v（Verasonics）以及L22-8v（Verasonics）超声探头的工作带宽区间。本数据集涵盖不同牺牲深度（2.5毫米至20毫米）与每串脉冲数（3至8）下的信噪比理论增益。此处的时延指脉冲串首脉冲与第i个脉冲（i从2起算）之间的对应时延。