AN ALGORITHM FOR THE AUTOMATIC IDENTIFICATION OF LEFT-VENTRICULAR INTERNAL WALL EDGES IN DIGITAL ECHOCARDIOGRAPHIC IMAGE SEQUENCES

The present paper describes an automated procedure for the detection o f left ventricular internal wall edges in digital echocardiographic im age sequences. The proposed procedure is divided into three steps and programmed in C/UNIX. It includes the use of a specially designed, app lication-specific adaptive spatio-temporal filter for noise reduction in echocardiographic image sequences, local 3-D histogram equalization for augmented contrast, and segmentation of the left ventricle using a regional growth method. When designing the adaptive spatio-temporal filter, we took into account the fact that the background noise is cor related in tangential orientation due to beam deflection at interfaces characterized by a large impedance ('')jump''. Using the specially de signed filter, the background noise is successfully reduced without de grading the ventricular contours. The simulation results presented hig hlight the performance of the proposed method in an exemplary manner.