Abstract 3741: Anatomic Right Ventricular Measurements with Live 3D Echocardiography and Magnetic Resonance Imaging: A Comparison Study Using a New 4D Analysis Method
Background: Asymmetry and anatomical complexity of the right ventricle (RV) make accurate determination of RV shape and volume difficult. We tested a newly developed 4D semiautomated RV analysis software usable for both 3D ultrasound (US) and MRI images.
Methods: 22 patients with either grossly normal cardiac anatomy or major CHD were studied at the same visit with both 3D US and MRI for RV size and function. US images were acquired with a real time 3D Philips 7500 US system and full matrix-array 3D transducer (RT3DE) in a full volume sweep from apical and subcostal views. MRI images were acquired with a 3 Tesla MRI magnet with segmented cine-loop gradient echo sequences at short and rotated long axis views to cover the RV outflow tract (OT). The analysis program displays sagittal, 4-chamber and coronal views for semiautomatic contour detection with manual correction options.
Results: The RV free wall, tricuspid valve, RVOT and apex could be visualized well in both methods, with some variability of acoustic window quality between patients. Although there was a slightly higher variability measuring RVEF and volumes obtained by US, both imaging methods showed comparable results. RVEF was measured between 19–34% with US and 24–36% with MRI. The Bland-Altman method showed aminimal underestimation of EF by ultrasound −2.2% (r=0.95); RV EDV, −2.1cc (r=0.95); and RV ESV −1.8cc (r=0.95).
Conclusions: The 4D RV semiautomated contour detection method was adaptable to work with both MRI and 3D echocardiography and provided an easy to understand display of golbal and regional RV anatomy and function.