Effect of Instrumental Settings on Color Doppler Flow Convergence Quantification
- VernacularTitle:超声仪器条件对彩色多普勒血流会聚定量的影响
- Author:
Jun ZHANG
;
Yunqiu QIAN
;
Qinglin GUO
- Publication Type:Journal Article
- Keywords:
color Doppler ultrasound;
flow convergence
- From:
Chinese Journal of Ultrasonography
1996;5(1):32-35
- CountryChina
- Language:Chinese
-
Abstract:
Flow convergence is a new method of color Doppler flow quantification.The effect of instrumental settings on flow convergence was investigated in an in-vitro model.The result showed that the flow convergence volume increased from 1.67±1.01 l/min to 2.20±1.35～2.30±1.43 l/min(P< 0.0001)when aliasing limit(same concept as Nyquist frequency)was changed from 23 cm/s to 12cm/s. There was no significant effect on flow convergence volume with the change of other instrumental settings,including Color gain,frame frequency,paket size,transmit power,transducer frequency,etc. Color Doppler flow convergence is influenced by aliasing limit.mainly because that the isovelocity surfaces in acceleration region developed by different aliasing limits are not always in the shape of hemisphere.The result suggested that besides the selection of aliasing limit fits to a hemispherical isovelocity surface,flow convergence is rarely affected by the other instrumental settings,and therefore is a relatively stable parameter of flow quantification.
