VERY HIGH FREQUENCY (V1 1F) DIFFRACTIVE TRANSDUCERS FOR BLOOD FLOW MEASUREMENTS

该项目的目标是开发一种准确的方法 使用小型、扁平、一次性传感器测量血流量，这些传感器可以 放置在血管上或血管附近的。这种新的方法 与角度无关的多普勒测速需要绕射 换能器，其平面可平行于流体定向。 超声多普勒法现在被广泛应用于医学上 测量和绘制血流量图。所有高端超声波扫描仪 具有多谱勒和多谱勒成像能力。问题在于 多普勒技术是从多普勒频移中提取的速度 是角度相关的，角度很难估计。作为一名 结果，误差可达50%。这种新方法可能会提供一种 解决这个长期存在的问题。衍射换能器具有 在5至25 MHz的频率范围内制造，并用于 与埃斯特卡特开发的用于动物和 病人研究。换能器性能的有限元模拟也 已经完成了。

Tho objective of the project is to develop an accurate method for measuring blood flow using small, flat, disposable sensors that can be placed on or near the blood vessel. This new method of angle-independent Doppler velocity determination requires diffractive transducers, whose plane can be oriented parallel to the flow. Ultrasonic Doppler methods are now widely used in medicine for measuring and mapping blood flow. All high end ultrasonic scanners have Doppler and Doppler imaging capabilities. The problem with Doppler techniques is that the velocity extracted from Doppler shift is angle dependent and the angle is difficult to estimate. As a result, the error can be as large as 50%. This new method may offer a solution to this long standing problem. Diffractive transducers have been fabricated in the frequency range form 5 to 25 MHz range and used in conjunction with an instrument developed at Echocath for animal and patient studies. FEA simulation of transducer performance has also been carried out.