Development of Three-Dimensional Ultrasonic Doppler Method of Measuring Spatial Distribution of Blood Flow Velocity

虽然彩色多普勒方法被广泛应用，但由于它只能测量三维血流速度沿波束方向的沿着一个分量，图像不能反映血流的真实速度，因此提出了利用二维阵列探头测量ROI内任意点血流速度三个分量的思想。该方法具有以下优点：由于简单的并行信号处理，真实的时间测量，由于传统的彩色多普勒方法的扩展，与其他方法相比，更容易实现。首先，性能，例如，通过仿真分析和基础实验，评价了该系统空间分辨率、准确度、信噪比灵敏度及其与孔径大小的关系。其次，研究了流速分布的显示方法，因为每个测量值的三个分量被绘制在三维空间中，并且其图像在临床使用中必须是可理解的。最后对该方法的实用性进行了评价。

Although the color doppler method is widely used, the image does not represent the true veleocity of blood flow because it can measure only one component along the beam direction of three-dimensional velocity.We presented an idea of measuring three components of blood velocity at any point in the ROI by using two-dimensional array probe. The method has the following merits : real time measurement due to simple and parallel signal processing, and easier implementation compared with other methods due to the extension of conventional color doppler method.In this work, we examined practical problems for implementation. At first the performance, e.g., spatial resolution, accuracy, sensitivity to S/N and their relation to aperture size were evaluated by simulation analysis and basic experiment using flow phantom. Next the way to display the velocity distribution was investigated because three components for each measured value are plotted in the three-dimensional space and its image must be comprehensible in clincal use. At last the practicability of the method was evaluated.