论文部分内容阅读
超声弹性成像有希望成为生物软组织病变诊断和力学特性评价的有效手段．提出利用小坡变换检测组织背向散射信号的不连续性，估计规则散射元空间分布及其变化，由此得到组织内部应变分布与弹性模量的新方法．结果表明，利用小波变换的散射元定位方法具有较强的抗干扰能力，基于散射元间距的运动估计方法避免了超声散斑的解相关性，计算量较小，无误差积累．组织内部应变和弹性估计能够区分杨氏弹性不同的组织，具有较高的空间分辨力．方法同时提供了组织弹性与微结构的信息．
Ultrasound elastography is expected to become an effective means of diagnosis and mechanical properties evaluation of biological soft tissue lesions. The discontinuity of tissue backscatter signal is detected by using small slope transform, and the spatial distribution of regular scatterer and its variation are estimated. A new method of strain distribution and elastic modulus in tissue is obtained. The results show that the scattering element localization method based on wavelet transform has strong anti-jamming ability. The motion estimation method based on scattering element pitch avoids the de-correlation of the ultrasonic speckle, and the calculation is small with no error accumulation. Organizational strain and elasticity estimates can distinguish Young’s elastic different tissues with high spatial resolution. The method provides both tissue elasticity and microstructure information.