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Standard MRI assessment of right ventricular (RV) volume and mass is based on assessment of a stack of "standard" short axis images (fig. 1) obtained with respect to the horizontal long axis of the heart. A "modified" RV short axis stack of images, based on cross-sections of the RV outflow long axis (fig. 2), has recently been demonstrated to overcome observed inaccuracies in definition of the tricuspid valve plane for the "standard" image stacks, and therefore to result in less interobserver variability and more reliable RV volume estimates in subjects with anatomically and functionally normal RVs.

journal of cardiovascular magnetic resonance

1071 Interobserver variability differences for cardiac MRI right ventricular (RV) volumetry and mass measures between standard and "modified" right ventricular short axis imaging in patients with chronic pulmonary insufficiency