摘要
超声弹性成像正在成为一种新的临床诊断工具,然而低质量的应变图像降低了其临床使用价值。为了提高应变图像质量,利用Chirp编码激励可以提高超声回波信噪比,代替传统的短信号,将Chirp编码激励应用到一个实时的超声弹性成像系统上,该系统采用普遍的商用线阵探头。在一个仿真人体组织的弹性成像模型上,对比和分析了Chirp信号和传统短信号的性能,并测试和分析了位置估计算法、脉冲长度、加窗函数和中心频率等因素对弹性成像系统的影响。实验结果表明Chirp信号使应变图像的弹性信噪比增加了27%,对比噪声比提高了78%。
Ultrasound strain imaging is becoming a new tool for clinician to detect lesions in tissue.However,poor quality of strain image degrades its clinical value.To improve the quality of strain image,chirp-coded pulse excitation was applied to a real time strain imaging system in which a commercial linear-array probe was used.On a tissue-mimicking phantom,the performances of chirp pulse and short pulse were compared,and effects of location estimator,pulse length,window function and center frequency on strain imaging were tested.Experimental results show that elastographic signal-to-noise ratio（SNRe） and elastographic contrast-to-noise ratio（CNRe） of strain image are increased respectively up to 27% and 78% by using chirp-coded pulse excitation.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2011年第4期514-519,共6页
Chinese Journal of Biomedical Engineering
基金
成都信息工程学院校选科研基金(CRF200912)
关键词
CHIRP
编码激励
弹性成像
应变图像
chirp
coded pulse excitation
elasticity imaging
strain image
