基于图像对比度分析的自适应超声声速优化

本文提出一种基于图像对比度分析的自适应声速优化技术,从而实时得到对比度增强、组织结构清晰可见的超声影像。论文首先描述超声系统动态延迟聚焦的波束形成过程,并引入系统声速以及组织真实声速等概念,进而讨论其两者不匹配对图像品质的影响。介绍图像灰度值表示的对比度之后,论文阐述了准确估计与组织声速一致的系统声速的基本原理。最后,论文通过已知声速的仿人体组织体模和真实人体组织超声影像来验证,并与已有声速优化方法进行比较。实验结果不仅表明本研究所估计的声速是准确的,而且算法运算速度亦适用于超声系统的实时应用。

An adaptive ultrasound sound speed optimization based on image contrast analysis

In order to get real time ultrasound images with clear structure and improved contrast,an adaptive ultrasound sound speed optimization method based on image contrast analysis was investigated.It firstly introduced the dynamic beamforming of ultrasound system,as well as the definition of assumed system's sound speed and the true sound speed propagated in tissue;the degrade image quality due to their mismatch was also discussed.After given the pixel gray level value based ultrasound image contrast ratio,the b...