 Magnetic Resonance imaging techniques of the heart allows relatively high resolution cross sectional imaging. For example a 512X512 matrix over a 40cm field of view provides in plane resolution better that 1mm. No assumptions are made in regard chamber cross sectional area and hence volume morphology. The slice thickness is determined in advance and may be in the range of 1-10mm. MR data ca be acquired sequentially throughout the cardiac cycle and thus provide a time varying 3D map of the cardiac chambers and related structures during the cardiac cycle. 