Walker P G, Kim Y, Muralidharan E, Miyajima Y, Delatore J, Yoganathan A P
Cardiovascular Fluid Mechanics Laboratory, School of Chemical Engineering, Georgia Institute of Technology, Atlanta 30332.
Echocardiography. 1994 Jan;11(1):11-28. doi: 10.1111/j.1540-8175.1994.tb01041.x.
An in vitro steady flow experiment was performed in order to test the accuracy of velocity measurements obtained through color Doppler flow mapping (CDFM). Using the American Society of Echocardiography (ASE) flow phantom, low (maximum velocity = 60 cm/sec), medium (maximum velocity = 300 cm/sec) and high (maximum velocity = 600 cm/sec) speed accelerating flow fields, in which multiple aliases were visible, were imaged. A fully automatic computer algorithm was used to unwrap the aliases and to convert the CDFM to digital velocity. Packet size and wall filter frequency on the ultrasound machine were varied and the measured velocity compared to the true velocity. The results show that the velocity obtained in this way from the CDFM is very accurate at the low and medium velocities, but for the high velocity the turbulence is too intense to obtain an accurate result. There was no marked difference between the data for different packet sizes or wall filter settings.
为了测试通过彩色多普勒血流图（CDFM）获得的速度测量的准确性，进行了一项体外稳流实验。使用美国超声心动图学会（ASE）的血流模型，对低（最大速度 = 60厘米/秒）、中（最大速度 = 300厘米/秒）和高（最大速度 = 600厘米/秒）速加速流场进行成像，其中可见多个混叠现象。使用一种全自动计算机算法来展开混叠并将CDFM转换为数字速度。改变超声仪上的数据包大小和壁滤波器频率，并将测量速度与真实速度进行比较。结果表明，以这种方式从CDFM获得的速度在低、中速度下非常准确，但对于高速情况，湍流过于强烈，无法获得准确结果。不同数据包大小或壁滤波器设置的数据之间没有显著差异。
