3D modeling of heart shape

In an attempt to intuitively grasp the state of the living body (especially the state of the heart), research is being conducted on technology to draw its shape changes in real time from biological sounds acquired with a stethoscope or similar device. The heart is beating in an almost cyclical manner during normal conditions, and focusing on the 'sound' of the heart, it could be seen as transitioning between the four states of S1, systole, S2 and diastole in sequence. If we reorganise these state transitions in terms of the 'movement' of the heart, as shown in the diagram below, we can see the states as atrial systole, isovolumic systole, ejection phase, isovolumic diastole and filling phase, in that order. As the heart plays the role of a pump that pumps blood throughout the body, it is expected to maintain a specific physical relationship between its pressure and volume throughout the state transitions. Focusing on this physical property, we propose a method to induce the heart to follow a heart-like motion linked to the state transitions inferred from the heart sounds.