1. A method for detecting coronary stenosis through spatio-temporal tracking comprising: extracting a coronary artery tree from each of a sequence of angiogram images; creating a mean artery tree from the extracted coronary artery trees; projecting the mean artery tree back onto each of the sequence of angiogram images to recover a complete coronary artery tree for each of the sequence of angiogram images; extracting one or more tubular sections from each of the sequence of angiogram images; estimating an arterial width for each of the one or more tubular sections from each of the sequence of angiogram images; creating a spatio-temporal surface from the arterial widths of the one or more tubular sections over a time spanned by the sequence of angiogram images; detecting a minimum in the spatio-temporal surface; and determining if the minimum is indicative of stenosis.