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Abstract #0790

Contribution of Endocardial Trabeculae and Papillary Muscles to Left Ventricular Volumes

Pednekar A, Muthupillai R, Cheong B, Flamm S
Philips Medical Systems, St.Lukes Episcopal Hospital and Texas Heart Institute

Presently, estimation of left ventricular (LV) ejection fraction (EF) from cine-MRI requires manual tracings of the LV cavity, which introduces considerable variability in amounts of endocardial trabeculae (T) and papillary muscles (P) included in end-diastolic (ED) and end-systole (ES) volumes. Two experienced observers delineated the endocardium circumscribing P and T, and one observer drew an additional contours circumscribing P separately at ED and ES. An automatic algorithm estimated the LV blood volume. From these measures, we quantitatively evaluated the relative contributions of tissues T and P to LV volumes at ED and ES, and to EF, using Bland Altman analyses.