Abstract: Objective:To investigate the value between three-dimensional real-time echocardiography(RT-3DE) and magnetic resonance imaging(MRI) in the assessment of right ventricular function of patients with chronic obstructive pulmonary disease(COPD).Methods:The hearts of 26 patients with COPD were detected by RT-3DE and MRI.The image data were collected using RT-3DE full-volume imaging capture to contract three dimensional model of right ventricular for measuring the mean of the end-diastolic volume(EDV),end-systolic volume(ESV),stroke volume(SV) and ejection fraction(EF).Meanwhile,the four indexes of right ventricular function were measured using MRI several breath-hold cine.Results:The means of EDV,ESV,SV and EF measured by echocardiography were(118.35±13.83) mL,(66.74±14.27)mL,(49.16±12.38)mL and(45.1±6.7)%,respectively,the means of EDV,ESV,SV and EF measured by MRI were(124.63±21.52)mL,(62.18±12.34)mL,(51.25±15.83)mL and(46.3±7.1)%,respectively.The differences of four indexes measured by two kinds of methods were not statistically significant(P>0.05),which was no correlation between 2 methods(P>0.05).Conclusions:The RT-3DE in evaluating the right ventricular function in COPD patient is accurate and reliable,which is high correlation with the indexes measured by MRI.