1Comparative assessment of pediatric right ventricular volumes and function by MRI: right horizontal long axis versus short axis

Background Accurate and reproducible assessments of right ventricular (RV) size and function are important for clinical decisions. RV volume assessment by CMR has been traditionally performed using a short axis orientation (SAX). This projection, however, renders en-face views of the mitral and tricuspid valves. Distinction between atriums and ventricles can be difficult, which can complicate contour tracings for ventricular function. To improve reproducibility, alternative orientations for RV assessment have been proposed. This investigation sought to compare right horizontal long axis (RHLA) and SAX reproducibility in a pediatric cohort.