2 Direct comparison between tissue Doppler imaging and velocity-encoded magnetic resonance imaging for the assessment of performance and temporal activation of the right ventricle in corrected tetralogy of Fallot patients

Materials and Methods: Local institutional review board approval was obtained, and patients or their parents gave informed consent. Thirty-three patients (20 male, 13 female; median age 12 years (11-15) [inter-quartile range]; range 8-18 years) and 19 controls (12 male, 7 female, median age 14 years (12-16), range 8-18 years) underwent VE-MRI and TDI. Peak systolic velocity and time to peak systolic velocity (expressed as percentage of cardiac cycle) were assessed at the RV free wall (RVFW) and RV outflow tract (RVOT). Data were analyzed using linear regression, paired and unpaired tests and Bland-Altman plots.