The axial resolution of a B-mode (or intensity) image is limited by the bandwidth of the pulse envelope. In this report, we investigate the source of this limitation by examining the transfer of high-resolution information from the tissue impedance variance throughout the imaging process. For that purpose, we express the mean and variance of the echo-intensity signal as a linear system to track the flow of object information along the image-formation chain. The results reveal how demodulation influences the available information by discarding high spatial-frequency information. This analysis further points to a simple way to recover lost information with only a minor addition to signal processing. Software phantoms are used to show that under ideal conditions, information from small-scale high-contrast reflectors, such as microcalcifications, can be significantly enhanced with this simple change to echo processing.

中文翻译：

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使用回波强度平均值恢复丢失的超声信息的方法

B 模式（或强度）图像的轴向分辨率受脉冲包络带宽的限制。在本报告中，我们通过检查整个成像过程中来自组织阻抗变化的高分辨率信息的传输来研究这种限制的来源。为此，我们将回声强度信号的均值和方差表示为线性系统，以跟踪对象信息沿图像形成链的流动。结果揭示了解调如何通过丢弃高空间频率信息来影响可用信息。该分析进一步指出了一种只需对信号处理进行少量添加即可恢复丢失信息的简单方法。软件体模用于显示在理想条件下，来自小尺度高对比度反射体的信息，如微钙化、