适用于临床实时出图的准静态弹性成像系统设计

Design of Quasi Static Elastography System for Clinical Real-time Imaging

为了在临床中能够获得实时稳定出图且分辨率高的准静态弹性成像,在弹性成像系统设计中加入了帧对构造模块、帧对筛选模块、弹性计算模块以及弹性帧相关处理模块;在帧对构造和帧对筛选模块中设计了帧对预筛选方案及评估方法,能够以较少的计算量实现对错误帧对数据的自动剔除,一方面减少了对操作手法的依赖,另一方面促进为了弹性图像输出稳定;弹性计算模块中采用二维自相关算法进行弹性应变值的计算,可以实现高分辨率弹性成像;弹性帧相关处理模块对多帧弹性图像做帧相关处理,进一步确保弹性图像输出稳定;临床乳腺及甲状腺病变检测结果表明,该系统设计方案可以实现帧率达18帧每秒的实时稳定、高分辨率(1.5 mm)弹性成像输出,且能够为临床医生提供有价值的辅助诊断信息。

In order to obtain real-time stable and high-resolution quasi-static elastography in clinic,frame pair construction module,frame pair screening module,elastic calculation module and elastic frame correlation processing module are added in the design of elastic imaging system.In the frame pair construction and frame pair screening module,the frame pair pre screening scheme and evaluation method are designed,which can automatically eliminate the wrong frame data with less calculation.On the one hand,it reduces the dependence on the operation method,on the other hand,it promotes the stability of the elastic image output.In the elastic computing module,the two-dimensional autocorrelation algorithm is used to calculate the elastic strain value,which can be realized High resolution elastic imaging;elastic frame correlation processing module does frame correlation processing for multiple elastic images to further ensure the stability of elastic image output.Clinical breast and thyroid lesions detection results show that the system design can achieve real-time stable,high-resolution(1.5 mm)elastic imaging output with a frame rate of 18 frames per second,and can provide valuable auxiliary diagnostic information for clinicians.