Objective:To evaluate the application of Quantitative tissue velocity imaging(QTVI) in assessing the left ventricular (LV) systolic function in Children with dilated cardiomyopathy(DCM).Methods:Fifteen consecutive children with DCM were included in the present study

who were divided into group A(with light heart failure) and group B(with moderate and severe heart failure).Twelve children without any cardiac diseases were as controls.The dynamic tri-plane QTVI images of apical four-chamber

LV two-chamber and LV long-axis views were acquired simultaneously and the myocardial velocity curves in basal and middle segments were analyzed.Results:(1)The peak systolic velocity (Vs)redueed generally in group A and B compared with that in controls

especially in group B(P<0.05).But the Vs did not reduce remarkably in some segments of group A(P>0.05).(2)There were forty-two segments with the velocity of postsystolie shortening(PSS) more than that of the systole in DCM group

among which thirty segments(71.43%)were from group B

and twelve segrnents(28.57%)from group A. Analyzed with strain

twenty-one segments (50.00%)were actively shortened and eleven segments (26.19%)were paradoxical motion.Conclusion:QTVI can assess LV systolic function accurately in Children with DCM.