Influence of cardiac motion on the velocity-time integrals of Doppler flow spectra: in vitro model study / 中华超声影像学杂志

ABSTRACT

Objective To investigate the influence of simulated heart motion on the Doppler spectrum velocity- time integral (VTI) of simulated blood flow measurements through an in vitro model. Methods Using heart-motion simulator model TD-3 designed by ourselves to note the feature of Doppler spectrum of simulated heart and simulated blood flow which moved separately and synchronously.The affection of the simulated heart's motion on the VTI of the simulated blood flow and their quantitative relationship were observed.Results When the simulated heart and blood flow moved synchronously, the VTI of the combined motion was the algebra sum of their VTI when their motion independently. The velocity and frequency of Doppler spectrum of simulated heart were unchanged. Conclusions The motion of simulated heart has a great influence on the value of Doppler blood flow spectrum VTI and this effect should be considered when blood flow volume was measured using Doppler's methods.