Calculation of the Ejection Fraction (EF) from MR Cardio-Images

This paper outlines an algorithm to segment images on the short-axis view of the heart, obtained from multislice and multi-phase MR (Magnetic Resonance). Using the data from the segmentation of the slices, the ejection fraction of the heart is calculated for the given sequence. Segmentation is achieved by first filtering the images using Adaptive Smoothing, which smoothes the image without shifting the image edge information. The images are then segmented using unsupervised clustering, which finds homogeneous groups of data points in the data set. The left ventricle cluster from each slice is then rendered and the ejection fraction calculated.