A method of displaying cardiac function which forms by helical or segmental analysis a three-dimensional cage model which can be shaded and color coded to indicate local and regional dysfunction by thickening or motion and stresses. On this model is superimposed the coronary artery tree including stenosed segments as obtained from the same patient by angiograms and the resulting three-dimensional coronary and mechanical model can be subjected to animation and analysis for diagnostic purposes and to simulate effects of treatment.