柯安达效应对颜色多普勒射流区域和颜色编码的影响. 在体外研究中,使用彩色多普勒流量映射进行了体外研究
K Chao1, V A Moises, R Shandas
1Department of Pediatric Cardiology, University of California San Diego.
Circulation
|January 1, 1992
概括
表面粘附,或Coanda效应,显著减少颜色多普勒射流区域,并增加反流编码. 这种相互作用会影响医学成像中血液流动的可视化.
科学领域:
- 流体动力学 流体动力学
- 医学成像医学成像
- 血液动力学 血液动力学
背景情况:
- 了解喷气表面相互作用对于准确的心声回声评估至关重要.
- 柯安达效应,或表面粘附,可以改变流体喷流的行为.
- 彩色多普勒回声心电图可视化血液流动,但其准确性可能受到流动动力学的影响.
研究的目的:
- 为了研究表面粘附对颜色多普勒射流特征的影响.
- 为了量化由于Coanda效应而导致的喷射面积和颜色编码的变化.
- 在体外模型中将表面粘附喷气与自由喷气进行比较.
主要方法:
- 使用了具有不符合要求的接收室的体外模型.
- 稳定的流量喷流与直或曲面平行地导向.
- 彩色多普勒成像在各种流速中垂直于表面平面进行.
主要成果:
- 与控制式自由喷气相比,表面粘附喷气的面积较小 (p < 0.01).
- 附着喷射显示了增加的绿色和蓝色像素,表明逆流 (p < 0.05).
- 回归分析显示,与控制喷气相比,表面喷气中的流速与喷气面积的斜率明显较低 (p < 0.0001).
结论:
- 表面粘附 (科安达效应) 显然影响喷射尺寸和颜色多普勒编码.
- 这些发现表明粘性能量损失,减速和流量逆转有助于喷气表面相互作用.
- 这项研究强调了在解释喷射表面现象的彩色多普勒成像时考虑表面粘附的重要性.
相关概念视频
01:05Doppler Effect - II
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
01:23Flow Cytometry
The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
In...
In...