In the article entitled “Improved Semiautomated Quantification of Left Ventricular Volumes and Ejection Fraction Using 3-Dimensional Echocardiography with a Full Matrix-array Transducer: Comparison with Magnetic Resonance Imaging,” (J Am Soc Echocardiogr 2005;18:779-788) the name of one of the authors was listed incorrectly. The correct listing is Juan Luis Gutiérrez-Chico, MD.