论文部分内容阅读
本文研究了基于超声造影剂的血流运动场估计与显示技术，通过在血液中注入超声造影剂作为示踪粒子，对造影谐波图像进行时域相关处理，可得到成像部位的二维流场分布图。相对于常规Ｄｏｐｐｌｅｒ方法中用Ｄｏｐｐｌｅｒ回波信号的频偏计算流速值，该技术可直接从超声图像提取与夹角无关的流速矢量信息。本文通过流动模型验证该方法，浸入超声水槽中的乳胶管中流动着血液替代品，沿水流方向进行超声成像，对实验所得的造影后的Ｂ超图像以及谐波图像，用一种节省计算量的多尺度相关算法进行处理，并相互比较。结果显示，谐波图像相对Ｂ超基波图像具有更高的信杂比，从根本上解决了基波图像低信噪比对时域相关测量精度的限制，可以得到与夹角无关的二维血流场分布图，该方法是医学和有关工业领域中超声流场测量的一种有效的方法。
In this paper, we study the blood flow field estimation and display technology based on ultrasound contrast agent. By injecting ultrasound contrast agent into the blood as the tracer particles, the two-dimensional flow field distribution of the imaging site can be obtained by time- Figure Compared with the conventional Doppler method using Doppler echo signal frequency offset calculation of the flow rate value, the technology can be directly extracted from the ultrasound image and angle-independent velocity vector information. In this paper, the method is validated by the flow model. Blood substitutes are infiltrated through the latex tube immersed in the ultrasonic water tank. Ultrasound imaging is performed along the flow direction. The calculated B-ultrasound image and the harmonic image obtained by the experiment are calculated in a computationally saving Multi-scale correlation algorithm to deal with and compare with each other. The results show that the harmonic image has a higher signal to noise ratio than the B-basis image and fundamentally solves the limitation of the low signal-to-noise ratio of the fundamental image on the measurement accuracy of the time domain. A two-dimensional Blood flow field profile, which is an effective method of ultrasonic flow field measurement in medicine and related industrial fields.