Study of Ultrasound Doppler Spectra Statistics Signal to Noise Ratio & Pressure

这项研究开发了一种非常重要的、新颖的血流量测量方法。在传统的多普勒血流测量中，在血液中产生超声波的传感器和发射器必须放置在传感器和血流几乎平行的位置。众所周知，对于接近90度的角度，角度的小误差会导致流量估计的大误差。然而，如果使用本文提出的方法，即“频谱带宽”来估计频率，则可以解决此问题。这种使用频谱带宽进行速度估计的技术开辟了以前无法接近的几乎垂直于血流的角度范围。将传感器直接放置在血泡上，而不必弯曲血泡，将大大增加测量的实用性和便利性。

This research has developed a very important and novel means of measuring blood flow. In a conventional Doppler flow measurement, the sensor and transmitter, which produces the ultrasound waves in the blood, must be positioned such that the sensors and blood flow must be nearly parallel. It is known that for angles close to 90 degrees, a small error in the angle leads to a large error in the flow estimate. However, this problem is resolved if one uses the method proposed here namely a "spectrum band-width" to estimate frequency. This technique of using spectrum band-width for velocity estimates opens up the previously inaccessible range of angles which are nearly perpendicular to the flow of blood. Placement of the sensor directly on the blood vesicle without having to bend the vesicle will greatly increase the utility and convenience of the measurement.